[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO2020186843A1 - 激光光源和激光投影设备 - Google Patents

激光光源和激光投影设备 Download PDF

Info

Publication number
WO2020186843A1
WO2020186843A1 PCT/CN2019/125368 CN2019125368W WO2020186843A1 WO 2020186843 A1 WO2020186843 A1 WO 2020186843A1 CN 2019125368 W CN2019125368 W CN 2019125368W WO 2020186843 A1 WO2020186843 A1 WO 2020186843A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser
light
light source
assembly
green
Prior art date
Application number
PCT/CN2019/125368
Other languages
English (en)
French (fr)
Inventor
颜珂
田有良
李巍
赵云
Original Assignee
青岛海信激光显示股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201910538767.2A external-priority patent/CN112114483B/zh
Priority claimed from CN201910539490.5A external-priority patent/CN111722464B/zh
Application filed by 青岛海信激光显示股份有限公司 filed Critical 青岛海信激光显示股份有限公司
Priority to US16/744,722 priority Critical patent/US11079665B2/en
Publication of WO2020186843A1 publication Critical patent/WO2020186843A1/zh

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings

Definitions

  • the present disclosure relates to the technical field of laser projection, and in particular to a laser light source and laser projection equipment.
  • the laser light source has the advantages of good monochromaticity, high brightness and long life. It is an ideal light source and is widely used in laser projection equipment such as laser TVs and laser projectors.
  • a laser light source includes: a first laser component arranged on a first plane and configured to emit a first laser; a second laser component arranged on a second plane perpendicular to the first plane and configured To emit a second laser; a third laser assembly is arranged in parallel with the second laser assembly on the second plane; the second laser assembly is closer to the first laser assembly than the third laser assembly; The third laser assembly is configured to emit a third laser; a first light combining mirror is arranged at a position opposite to the third laser assembly and configured to reflect the third laser; a second light combining mirror , Set at the intersection of the third laser and the second laser, and configured to transmit the second laser and reflect the third laser; a third light combining mirror is set at the first laser and the The intersection of the second laser light and the third laser light after passing through the second light combining mirror, and is configured to transmit the first laser light and reflect the second laser light and the third laser light to The first laser, the second laser and the third laser are directed toward the light
  • a laser projection device in another aspect, includes: a complete machine housing; a laser light source installed in the complete machine housing, the laser light source being the laser light source as described in the first aspect; the light installed in the complete machine housing
  • the optical engine is connected to the lens, and the laser light source is configured to provide illumination to the optical engine.
  • 1A is a schematic diagram of the whole structure of a laser projection device in some embodiments of the disclosure.
  • FIG. 1B is a schematic diagram of the heat dissipation structure of the whole machine of a laser projection device in some embodiments of the disclosure
  • FIG. 1C is a schematic diagram of the optical path principle of a laser projection device in some embodiments of the disclosure.
  • FIG. 2 is a schematic diagram of a DLP projection architecture in some embodiments of the disclosure.
  • 3A is a schematic diagram of an ultra-short throw projection imaging optical path in some embodiments of the disclosure.
  • 3B is a schematic diagram of an ultra-short throw projection system in some implementations of the present disclosure.
  • 4A is a schematic structural diagram of an ultra-short throw projection screen in some embodiments of the disclosure.
  • 4B is a graph showing the change in reflectivity of the projection screen to the projection beam in FIG. 4A;
  • 5A is a schematic structural diagram of a light source in the laser projection device shown in FIG. 1A;
  • FIG. 5B is an exploded schematic diagram of the structure of FIG. 5A;
  • 5C-1 is a schematic diagram of an assembly of a laser assembly in some embodiments of the disclosure.
  • 5C-2 is a schematic diagram of assembly of another laser group in some embodiments of the disclosure.
  • 5D is a schematic diagram of an exploded structure of a laser assembly in some embodiments of the disclosure.
  • 5E-1 is a schematic diagram of an exploded structure of another laser assembly in some embodiments of the disclosure.
  • 5E-2 is a schematic diagram of an exploded structure of another laser assembly in some embodiments of the disclosure.
  • Figure 5F-1 is a schematic diagram of the structure of an MCL laser
  • 5F-2 is a schematic diagram of the circuit packaging structure of the laser in FIG. 5F-1;
  • 5G is a schematic diagram of the optical path principle of a light source in some embodiments of the disclosure.
  • 5H is a schematic diagram of the optical path principle of another light source in some embodiments of the disclosure.
  • FIG. 5I is a schematic structural diagram of the light source shown in FIG. 5A from another angle;
  • 6A-1 is a schematic structural diagram of a heat dissipation system of a light source part in some embodiments of the disclosure
  • 6A-2 is an exploded schematic diagram of the heat dissipation system of the light source part in some embodiments of the disclosure.
  • FIG. 6B is a schematic diagram of the heat dissipation path a in some embodiments of the disclosure.
  • 6C is a schematic diagram of a heat dissipation system of a red laser assembly in some embodiments of the disclosure.
  • 6D is a schematic diagram of the assembly of the heat dissipation system of the blue and green laser components in some embodiments of the disclosure.
  • 6E is an exploded schematic diagram of the heat dissipation system of blue and green laser components in some embodiments of the disclosure.
  • FIG. 7 is a schematic structural diagram of a light-emitting chip of a red laser assembly in some embodiments of the disclosure.
  • 8A is a schematic diagram of the optical path principle of a laser projection system in some embodiments of the disclosure.
  • 8B is a schematic diagram of the optical path principle of still another laser projection system in some embodiments of the disclosure.
  • 8C is a schematic diagram of the optical path principle of another laser projection system in some embodiments of the present disclosure.
  • FIG. 9A is a schematic diagram of a structure of a diffusion sheet in some embodiments of the disclosure.
  • FIG. 9B is a schematic diagram of the energy distribution of the laser beam after passing through the diffuser shown in FIG. 9A in some embodiments of the disclosure;
  • FIG. 10 is a schematic diagram of a spot formed by a laser beam emitted by a laser assembly in some embodiments of the disclosure.
  • 11A is a schematic diagram of the optical axis of a half-wave plate in some embodiments of the disclosure.
  • FIG. 11B is a schematic diagram of the principle of a 90-degree change of linearly polarized light in some embodiments of the disclosure.
  • 11C is a schematic diagram of the polarization directions of P light and S light in some embodiments of the disclosure.
  • FIG. 11D is a schematic diagram of the rotation setting of the half-wave plate in some embodiments of the present disclosure.
  • FIG. 12A is a schematic diagram of an optical path principle in some embodiments of the disclosure.
  • FIG. 12B is a schematic diagram of another optical path principle in some embodiments of the disclosure.
  • 12C is a schematic diagram of another optical path principle in some embodiments of the disclosure.
  • FIG. 12D is a schematic diagram of the optical principle of another laser projection device according to some embodiments of the disclosure.
  • connection should be interpreted broadly. For example, they can be fixed or detachable. Connected, or integrally connected; it may be directly connected, or indirectly connected through an intermediate medium, or it may be the internal communication between two components.
  • connection should be interpreted broadly. For example, they can be fixed or detachable. Connected, or integrally connected; it may be directly connected, or indirectly connected through an intermediate medium, or it may be the internal communication between two components.
  • FIG. 1A shows a schematic structural diagram of a laser projection device.
  • the laser projection device 10 includes a complete machine housing 101 and a plurality of optical parts including a light source 100, an optical engine 200 and a lens 300.
  • Each optical part (for example, the light source 100, the optical engine 200 or the lens 300) has a corresponding casing to be wrapped, and meets certain sealing or airtight requirements.
  • the light source 100 achieves an airtight seal through its corresponding casing, which can be more Good to improve the light attenuation problem of the light source 100.
  • the light source 100, the optical engine 200 and the lens 300 are installed in the housing 101 of the complete machine.
  • the optical engine 200 and the lens 300 are connected and arranged along the first direction X of the complete housing 101 to divide the space in the complete housing 101 into a first area M 1 and a second area M 2 .
  • M 1 is provided with a region within the light source 100
  • M 2 the second region is provided with at least one circuit board.
  • the first direction X may be opposite to the direction viewed by the user, and the first direction X may be the width direction of the whole machine.
  • the first area M 1 is located on the first side of the lens 300 and the optical engine 200, that is, the first area M 1 refers to the space enclosed by the optical engine 200, the lens 300 and a part of the entire housing 101.
  • the second area M 2 is located on the second side of the lens 300 and the optical machine 200, that is, the second area M 2 refers to the space enclosed by the optical machine 200, the lens 300 and another part of the complete machine housing 101.
  • the light source 100 is a pure three-color laser light source and can emit red laser, blue laser and green laser. Therefore, the light source 100 is configured to provide an illuminating beam to the optical machine 200.
  • the light source 100 has a first light outlet 103
  • the optical engine 200 has a second light inlet 201 and a third light outlet 202
  • the optical engine 200 is provided with a light modulation device.
  • the second light entrance 201 and the third light exit 202 are located on different side walls of the light machine in a vertical relationship, where the vertical is vertical in the spatial position relationship, and different side walls can be They are the different side walls of the cuboid-shaped optical machine housing, and they can also be different sides of the optical machine housing in an irregular three-dimensional shape.
  • the first light outlet 103 of the light source 100 is connected to the second light inlet 201 of the optical engine 200.
  • the light beam of the light source 100 enters the inside of the optical engine 200 and then reaches the light modulation device.
  • the light modulation device modulates the light beam and passes through the light engine 200.
  • the port 202 outputs to the lens 300.
  • FIG. 1C shows a schematic diagram of the optical path of a laser projection device. As shown in FIG. 1C, it is divided into three optical parts according to optical functions, namely, a light source 100, an optical engine 200, and a lens 300.
  • the light source 100 includes a three-color laser assembly and a plurality of optical lenses, and the plurality of optical lenses homogenize and shrink the laser beam.
  • the light beam emitted from the light source 100 enters the optical engine 200.
  • the optical engine includes a light pipe 203. Usually, the light pipe 203 is located at the front end of the optical engine.
  • the light pipe 203 first receives the illumination beam emitted by the light source.
  • the light pipe 203 has the function of light mixing and homogenization.
  • the optical machine also includes some lens groups so that the illuminating light beam can be incident on the light modulation device, such as the light valve 204. After the light valve 204 modulates the light beam, the light beam is incident on the lens group of the lens 300 for imaging
  • the optical modulation device contained in the optical engine 200 is the core component of the system.
  • Light modulation devices such as light valves
  • the DMD light valve is used in the DLP (Digital Light Processing, Digital Light Processing) projection architecture.
  • FIG. 2 shows a DLP projection architecture, where the DMD digital micro-mirror array is the core component of the entire projection architecture.
  • DMD220 is a reflective light valve device.
  • the illumination beam output from the light source 100 usually needs to pass through the illumination optical path 210 at the front end of the DMD220. After passing through the illumination optical path 210, the illumination beam meets the illumination size and incident angle required by the DMD220.
  • the surface of the DMD220 includes thousands of tiny mirrors, each of which can be driven individually to deflect, such as plus or minus 12 degrees or plus or minus 17 degrees.
  • the light reflected by the negative deflection angle is called OFF light, and the OFF light is invalid light, which is usually hit on the housing or absorbed by a light-absorbing device.
  • the light reflected by a positive deflection angle is called ON light.
  • the ON light is an effective light beam that is irradiated by the illumination beam by the tiny mirror on the surface of the DMD light valve and enters the lens 300 through a positive deflection angle for projection imaging.
  • the optical engine 200 applies a DLP projection architecture, and uses a DMD reflective light valve as a light modulation device.
  • the lens 300 is connected to the optical engine 200 through the third light outlet 202 of the optical engine 200, for example, through the end faces of the respective corresponding housings (lens housing and optical engine housing) are locked by screws, and, in some examples Part of the lens group of the lens 300 also extends into the third light outlet 202 of the optical engine 200.
  • the lens 300 includes a combination of multiple lenses, which are usually divided according to groups, and are divided into a front group, a middle group, and a back group, or a front group and a back group.
  • the front group is a lens group close to the light output side of the projection device
  • the rear group is a lens group close to the light output side of the light modulation device.
  • the lens 300 may also be a zoom lens, or a fixed-focus adjustable-focus lens, or a fixed-focus lens.
  • the laser projection device is an ultra short throw projection device
  • the lens 300 is an ultra short throw projection lens
  • the throw ratio of the lens 300 is generally less than 0.3, such as 0.24.
  • the ultra-short-throw projection lens may be the one illustrated in FIG. 3A, including a refractive lens group 310 and a mirror group 320.
  • the mirror group 320 may be a curved mirror.
  • the projection beam is oblique after passing through the lens 300. It is emitted upwards to the projection screen 400 for imaging. This is different from the traditional long-focus projection in which the projection beam optical axis is located at the vertical line of the projection screen.
  • the ultra-short-focus projection lens usually has 120% to 150% of the projection screen. Offset.
  • the projection screen size is usually above 70 inches, such as between 80 inches and 150 inches, for the lens 300, both Hundreds of times magnification, aberrations must be corrected, and it has a good resolution to present high-definition projection images.
  • the design difficulty of ultra-short-focus projection lenses is much greater than that of long-focus projection lenses.
  • the center vertical line of the light exit surface of the DMD light valve is usually parallel to the optical axis of the lens, but does not coincide, that is, the DMD is offset to the lens 300, which makes the light beam exiting from the DMD light exit surface at a certain angle Obliquely incident into the lens 300, passing through the transmission and reflection of a partial area of the multiple lenses, the projected light beam finally exits the lens portion 300 obliquely upward.
  • the DMD light valve is driven by an electric signal to modulate the light, so that the light beam carries image information, which is finally enlarged by the lens to form a projected image.
  • the galvanometer 230 is a transmission flat plate structure. Through the one-dimensional vibration, the galvanometer 230 will successively shift the transmitted sub-image beams, so that the two adjacent sub-images will be misaligned and superimposed and then imaged on the projection screen, using the persistence effect of human vision. The information of the sub-images is superimposed into a piece of image information, the details of the image perceived by the human eye are increased, and the resolution of the image is also improved.
  • the galvanometer 230 can also perform a two-dimensional movement, such as moving in four positions up, down, left, and right, so that the four sub-images can be misaligned and superimposed together, and the above-mentioned information superposition principle is used to achieve the resolution improvement effect perceived by the human eye. Regardless of the superposition of two sub-images or four sub-images, the two sub-images or four sub-images need to be decomposed by a high-resolution image in advance, and the decomposition method needs to be combined with the movement of the galvanometer 230. Only by matching the methods can they be correctly superimposed without image confusion.
  • the galvanometer 230 is usually arranged between the DMD light valve and the lens.
  • the light beam transmitted between the DMD light valve and the lens can be regarded as a parallel light beam.
  • the parallel light beam is still refracted by the galvanometer 230 in a flat plate shape. Can maintain good parallelism. It is worth noting here that if the beam with a larger divergence angle is refracted by the galvanometer 230 in the form of a flat plate, the angle after refraction will change greatly, which may cause the superposition of two sub-image beams passing through the galvanometer successively. Uneven brightness or chromaticity.
  • a plurality of circuit boards 500 are arranged, and the plurality of circuit boards 500 include a power supply board, TV ( television, television) board, control board, display board, etc.
  • the above-mentioned multiple circuit boards 500 are usually stacked.
  • a part of the multiple circuit boards 500 can also be stacked in a direction perpendicular to the bottom wall of the complete machine housing 101, and the other part can be stacked in a direction parallel to the bottom wall of the complete machine housing.
  • the directions (for example, the first direction X) are stacked.
  • structures such as speakers, fans, and heat sinks are also arranged along the inner side of the housing 101 of the complete machine.
  • the optical engine 200 and the lens 300 are arranged along the first direction X of the complete equipment housing 101, and the complete equipment is divided into two parts, as shown in FIG. 1A.
  • the left and right parts ie, the first area M 1 and the second area M 2
  • one part for example, the first area M 1
  • the other part for example, the second area M 2
  • This division can be regarded as separating the optical and electrical areas.
  • the optical area is also usually provided with a drive circuit, but compared to the display board, signal board, power board and other circuit parts, the volume is smaller and the complexity is also lower, so the left half of the main body (ie The first area M 1 ) is an optical area, and the right half of the main body (ie, the first area M 2 ) is an electrical area.
  • Separating the different main bodies in this way not only facilitates the assembly and debugging of the whole machine, but also facilitates the respective design requirements of the optical part and the circuit part, such as heat dissipation, wiring, and electromagnetic testing.
  • the optical engine 200 and the lens 300 are arranged in the same direction, and part of the lens group of the lens 300 extends into the optical engine 200, which is beneficial to reduce the assembled volume of the optical engine and the lens.
  • the light beam of the light source 100 may undergo multiple turns and finally enter the lens 300, but the direction of the light beam emitted from the first light outlet 103 of the light source 100 is different from that of the lens 300.
  • the optical axis direction of the light beam emitted by the light source 100 and the optical axis direction of the light beam incident on the lens 300 have a vertical relationship in space.
  • the light source 100, the optical engine 200, and the lens 300 are connected and assembled to form an L shape, which provides a structural basis for the turning of the optical axis of the light beam, and reduces the design difficulty of the optical path of the light beam from the optical engine 200 to the lens 300. Moreover, the overall layout of the above-mentioned laser projection equipment is relatively compact, and the optical path structure is also simpler.
  • the light source 100 is used to provide light source illumination for the optical engine 200.
  • the light source 100 provides an illumination light beam for the optical engine 200 by sequentially outputting three primary color illumination light beams.
  • the light source 100 may also be output in a non-sequential manner, and there are periods of superimposed output of illumination light beams of different primary colors. For example, there is a superimposed output period of the red illumination beam and the green illumination beam, thereby increasing the proportion of the yellow illumination beam in the beam cycle, which is beneficial to improve the image brightness; or the red illumination beam, the green illumination beam, and the blue illumination beam are lit at the same time during a part of the period , The three-color illumination beam is superimposed to form a white illumination beam, which can increase the brightness of the white field. Therefore, in the case where the optical engine 200 includes a three-piece LCD liquid crystal light valve, in order to cooperate with the three-piece LCD liquid crystal light valve, the three-color primary color light in the light source 100 can be simultaneously lit and output mixed white light.
  • the light source 100 outputs three-color primary color light sequentially, according to the principle of three-color light mixing, the human eye cannot distinguish the color of light at a certain moment, and it still perceives mixed white light. Therefore, the output of the light source 100 is usually referred to as mixed white light.
  • FIG. 5A is a schematic diagram of a partial structure of the light source 100 in FIG. 1A
  • FIG. 5B is a schematic diagram of an exploded structure of FIG. 5A.
  • An example of a three-color laser light source will be described below in conjunction with the drawings.
  • the light source 100 includes a light source housing 102, and a red laser assembly 110, a blue laser assembly 120, and a green laser assembly 130 mounted on different side walls of the light source housing 102.
  • the red laser assembly 110 can emit red lasers.
  • the blue laser component 120 can emit blue laser light
  • the green laser component 130 can emit green laser light.
  • the blue laser component 120 and the green laser component 130 are installed side by side on the same side wall, and both are perpendicular to the red laser component 110 in space, that is, the light source where the blue laser component 120 and the green laser component 130 are located.
  • the side wall (ie, the second side wall) of the housing is perpendicular to the side wall of the light source housing (ie, the first side wall) where the red laser assembly 130 is located, and both side walls are perpendicular to the bottom of the light source housing 102
  • the green laser assembly and the blue laser assembly are located on the second plane, and the green laser assembly is arranged side by side with the blue laser assembly on the second plane; the red laser assembly is located on the first plane perpendicular to the second plane to Make the red laser assembly perpendicular to the green laser assembly and the blue laser assembly.
  • FIG. 5G is a schematic diagram of a light path principle of the light source 100.
  • the first laser component is a red laser component 110
  • the first laser is a red laser
  • the second laser component is a blue laser component 120
  • the second laser is a blue laser
  • the third laser component is a green laser component 130.
  • the third laser is a green laser.
  • the blue laser assembly 120 and the green laser assembly 130 are arranged side by side, and the blue laser assembly 120 is arranged closer to the red laser assembly 110 than the green laser assembly.
  • the light exit surface of the red laser component 110 faces the light exit of the light source, that is, the light beam emitted by the red laser component 110 can be directly output to the light exit of the light source 100 after a single transmission, without the need for light path turning.
  • the light beam emitted by the green laser component 130 exits the light exit port through three reflections, and the light beam emitted by the blue laser component 120 exits the light exit port through one transmission and one reflection. It can be seen that, in the above schematic diagram of the optical path principle, the red laser has the shortest optical path, the green laser has the longest optical path, and the green laser has the largest number of reflections.
  • the above-mentioned three color laser components output rectangular light spots respectively.
  • the long sides of the corresponding output rectangular light spots are perpendicular to the light source.
  • the bottom wall of the housing the laser spots output by the three-color laser assembly will not form a "cross"-shaped spot when the light is combined, which is beneficial to the reduction of the combined light spot size and higher uniformity.
  • the "combined light” and “combined light spot” here refer to the human eye The perceived effect of mixing white light.
  • the light source housing 102 includes a top cover and a bottom wall, and a plurality of side walls between the top cover and the bottom wall, and the first light outlet 103 is located on one of the side walls.
  • the light source 100 further includes a plurality of optical lenses, all of which are arranged on the bottom wall of the light source housing 102.
  • the top cover of the light source housing 102 is fin-shaped, which can increase the heat dissipation area.
  • a plurality of windows 1021 are opened on the side wall of the light source housing 102 to install the above-mentioned multiple laser components so that the light beams emitted by the laser components of any color can be incident into the light source housing 102 from the corresponding windows, and then A light transmission path is formed by a plurality of optical lenses.
  • the first side wall of the light source housing 102 is provided with a first window corresponding to the red laser assembly 110
  • the second side wall of the light source housing 102 is provided with a second window corresponding to the blue laser assembly 120
  • the third window corresponding to the green laser component 130 is provided.
  • control circuit boards are also installed on the top cover of the light source housing 102, and, as shown in FIG. 5I, a structural schematic diagram of the angle of the bottom wall of the light source housing is also reserved on the bottom wall. Adjustment structure installation position 1023.
  • the light source 100 further includes an air pressure balancing device 1022, and the air pressure balancing device 1022 is disposed on the bottom wall or the top cover of the light source housing 102.
  • the air pressure balance device can relieve the pressure. In the case that the internal temperature of the light source housing is too high, the air pressure balance device is used to relieve the pressure to the outside of the light source housing, or the air pressure balance device forms a gas containing space to increase the internal seal of the light source The volume of the space can balance the air pressure in the light source housing and improve the reliability of the operation of the optical devices in the light source housing.
  • the air pressure balance device 1022 is a filter valve, which is configured to communicate the inside and outside of the light source housing 102 to exchange airflow, that is, when the internal temperature of the light source housing 102 rises, the internal airflow The outside flows out. When the temperature drops and the inside of the light source housing 102 is cooled again, the external air flow can also enter the inside of the light source housing 102.
  • the filter valve is set as an airtight and waterproof filter membrane, which can filter dust and dust within a certain diameter range of the outside, block it out, and maintain the cleanliness of the inside of the light source housing.
  • the air pressure balancing device 1022 is a retractable airbag, which may be made of elastic rubber, and the airbag is configured to increase in volume during the increase of the internal air pressure of the light source housing 102 to relieve the internal air pressure of the light source housing 102 .
  • the above-mentioned three colors of laser components are all MCL (Multi-Chip Laser diode) type laser components.
  • the MCL type laser component includes an MCL laser and a laser drive circuit board arranged on the outer periphery of the MCL laser.
  • the MCL laser encapsulates multiple light-emitting chips on a substrate to form a surface light source output.
  • An MCL laser 110A as shown in FIG. 5F-1 includes a metal substrate 1102 on which multiple light-emitting chips are encapsulated.
  • the multiple light-emitting chips can be connected in series or driven in parallel in rows or columns.
  • the MCL laser 110A also includes a collimating lens group 1101 covering the light-emitting surfaces of the multiple light-emitting chips, and the collimating lens group 1101 is usually fixed by glue.
  • the collimating lens group 1101 includes a plurality of collimating lenses, which usually correspond to the light-emitting positions of the light-emitting chips one-to-one to collimate the laser beam.
  • the MCL type laser assembly further includes a laser driving circuit board 1104 arranged on the outer peripheral side of the MCL laser.
  • the laser driving circuit board 1104 has a flat structure, and the laser driving circuit board and the light emitting surface of the MCL laser are approximately parallel or located in the same plane.
  • At least one pin 1103 is provided on both sides of the MCL laser, and each pin 1103 is welded or plugged into the laser driving circuit board 1104, so that the MCL laser is electrically connected to the laser driving circuit board.
  • the laser driving circuit board 1104 is configured to provide driving signals to the MCL laser.
  • the laser driving circuit board is integrally formed to surround the outside of the substrate 1102 of the MCL laser.
  • the laser drive circuit board is two independent circuit boards, that is, the laser drive circuit board includes a first part 1104a and a second part 1104b, which enclose the MCL laser, so that the packaged laser assembly is basically It has a flat plate structure, which is easy to install, saves space, and is also conducive to miniaturization of light source equipment.
  • FIG. 5C-1 and 5D are respectively a schematic diagram of an assembly structure of any color laser component and a fixing bracket, and a schematic diagram of an exploded structure.
  • Figure 5C-1 shows a schematic view when viewed from the front (right) and a schematic view when viewed from the back (left).
  • the laser light source 100 further includes a fixing bracket 104.
  • the laser components of any color are installed at the window 1021 of the corresponding light source housing through the fixing bracket 104.
  • the fixing bracket 104 and the light source housing 102 are locked by screws, thereby fixing the laser The component is fixed at the position of the window 1021.
  • the red laser assembly 110 is installed at the first window of the light source housing through the first fixing bracket
  • the blue laser assembly 120 is installed at the second window of the light source housing through the second fixing bracket
  • the green laser assembly 120 is installed at the third window of the light source housing through the third fixing bracket.
  • the metal substrate of the MCL laser in the MCL laser assembly is provided with an assembly hole, which can be locked with the corresponding fixing bracket.
  • the fixing bracket 104 is a sheet metal part with a light-transmitting window frame 1041.
  • the front of the light-transmitting window frame 1401 is installed close to the window 1021 of the light source housing 102, and the laser assembly of any color is installed on the light-transmitting window.
  • a third sealing member 1042 is provided at the back installation position of the light-transmitting window frame 1041.
  • the third sealing member 1042 is a frame-shaped rubber member with a folded edge and can be sleeved on the MCL.
  • the third sealing member 1042 can also serve as a buffer to prevent the collimating lens group of the MCL laser assembly from being damaged due to hard contact with the sheet metal.
  • the MCL laser assembly is composed of the MCL laser 110A and the corresponding laser driving circuit board 1104.
  • the MCL laser assembly is fixed to the fixing bracket 104 and becomes an assembly unit, and is installed together at the position of the window 1021 corresponding to the light source housing 102. For example, there are studs around the window 1021, and the studs passing through the fixing bracket are driven into the studs around the window.
  • the light source 100 is equipped with multiple optical lenses, which are precision components, and the energy density during the transmission of the light beam inside the light source 100 is very high; therefore, if the internal environment is not clean, dust, dust and other particles will be Accumulation of multiple precision optical lens surfaces causes a decrease in light processing efficiency, which in turn causes adverse effects such as light attenuation of the optical path, and the brightness of the entire laser projection equipment will also decrease. Dustproofing the inside of the light source can alleviate the above-mentioned light attenuation problem.
  • a sealing glass 105 is also provided at the window 1021 of the light source housing 102.
  • the sealing glass 105 protects the light source housing
  • the interior is isolated from the laser assembly installed at the window 1021, so that external dust and the like will not enter the interior of the light source housing 102 from the window 1021.
  • the sealing glass 105 can be arranged on the inner surface of the light source housing 102, for example by bonding; it can also be arranged on the side of the light source housing 102 close to the laser assembly, for example, by setting an installation position on the outer surface of the light source housing 102, The laser assembly and the sealing glass are installed on the outside of the window of the light source housing in turn.
  • the sealing glass 105 is installed on the side of the window 1021 close to the laser assembly. There is also a first receiving groove on the front side of the fixing bracket 104 for receiving the first sealing member 1051; and a second receiving groove for receiving the second sealing member 1052 at the window 1021 of the light source housing.
  • the sealing glass 105 is located between the first sealing member 1051 and the second sealing member 1052.
  • the second sealing member 1052 is placed in the second receiving groove at the window 1021; the second sealing member 1052 is provided with a seal Place the sealing glass 105 in the fixed groove of the glass 105; and install the first sealing member 1051 into the first receiving groove of the light-transmitting window frame 1041 of the fixing bracket through interference fit; Install the laser assembly composed of the fixing bracket and the MCL laser to the window 1021 of the light source housing; the first sealing member 1051 is in contact with the sealing glass 105. As the laser assembly is fixed, the sealing glass 105 is also clamped on the A seal 1051 and a second seal 1052 are fixed between.
  • the MCL laser assembly of any color is fixed to the fixed bracket by the shoulder screw, and there is also a shock absorber between the shoulder screw and the fixed bracket, which can reduce the laser's driving process at a higher frequency. The resulting noise is transmitted.
  • the assembly structure of the laser assembly and the light source housing has been described above.
  • the above-mentioned laser assembly is installed on the housing of the light source, emits a laser beam under the control of a driving signal, forms a light path output inside, and cooperates with an optical machine and a lens to perform projection imaging.
  • the light source is the main heat source, and the high-density energy beam of the laser irradiates the surface of the optical lens to generate heat.
  • the DMD chip has an area of a few tenths of an inch, but it needs to bear the beam energy required for the entire projected image, and its heat generation is also very high.
  • the laser has a set working temperature to form a stable light output, thus taking into account the service life and performance.
  • the laser projection equipment also contains multiple precision optical lenses, especially the ultra-short focal lens contains multiple lenses. If the internal temperature of the entire device is too high and heat builds up, it will cause the lens in the lens to "temperature drift" phenomenon, laser projection The image quality of the device will be severely degraded.
  • the electronic devices on the circuit board are driven by electrical signals, and they also generate a certain amount of heat, and each electronic device also has a set operating temperature. Therefore, good heat dissipation and temperature control are very important guarantees for the normal operation of laser projection equipment.
  • the light source 100 and the second heat dissipation device are arranged in sequence, that is, the second heat dissipation device is arranged side by side with the light source 100 along the first direction X.
  • the light source 100 is disposed close to one side of the complete machine housing; the second heat dissipation device is disposed near the other side of the complete machine housing 101 along the first direction X, and the above two sides are opposite.
  • the second heat dissipation device includes a heat dissipation fin 601 and a heat pipe 602, the heat dissipation fin 601 and the blue laser assembly mounted on the light source housing 120 and the side wall of the green laser assembly 130 are arranged opposite to each other.
  • the blue laser component 120 and the green laser component 130 conduct heat to the heat dissipation fin 601 through the heat pipe 602.
  • the second heat dissipation device further includes a heat conduction block 603.
  • the heat conducting block 603 is in contact with the blue laser assembly 120 and the green laser assembly 130 to conduct heat through a heat sink.
  • the hot end of the heat pipe 602 is in contact with the heat conducting block to realize heat transfer; the cold end of the heat pipe 602 is in contact with the heat dissipation fin 601; the heat pipe 602 is a closed pipe with liquid inside, and heat conduction is realized through the change of liquid gas and liquid.
  • the radiating fins in contact with the cold end of the heat pipe are usually cooled by air cooling, so that the cold end of the heat pipe is also cooled, and the gas is liquefied and returned to the hot end of the heat pipe.
  • the laser projection equipment further includes a first heat dissipation device, which is located on the side of the light source and the second heat dissipation device away from the optical machine and the lens.
  • the first heat dissipation device includes a cold head 610, a cold row 611 and a pipe 614. Wherein, the cold head 610 is in contact with the side wall of the light source housing 102 opposite to the first light outlet 103 of the light source 100.
  • a red laser assembly 110 is installed on the side wall of the light source housing opposite to the first light outlet 103 of the light source 100, and the red laser assembly 110 is in contact with the cold head 610; the cold row 611 is away from the red laser assembly 110
  • the cold row 611 is arranged on the side of the second heat sink away from the lens; the pipe connects the cold head 610 and the cold row 611, so that the cooling medium circulates between the cold head 610 and the cold row 611, so that the red laser assembly 110 can be Heat dissipation through liquid cooling.
  • the cooling medium at the cold row 611 can be cooled by a fan.
  • the cooled cooling medium such as water, which is commonly used, flows back to the cold head 610, and circulates in turn to heat the heat source (such as the red laser component 110). Of conduction.
  • the first heat dissipation device also includes a pump, which is configured to drive the cooling medium in the pipeline to keep flowing.
  • the pump and the cold head are integrated to reduce the volume of the components.
  • the cold head mentioned below may refer to the cold head Integrated structure with pump.
  • the laser projection equipment of this example also includes a fluid replacement device, which is configured to refill the first heat dissipation device so that the liquid pressure in the entire first heat dissipation device is greater than the external pressure of the system, so that the external air will not be affected by the cooling medium. Volatilization or poor sealing of pipe joints enters the circulation system, causing internal noise in the circulation system, and even causing cavitation to damage the device.
  • the above-mentioned first heat dissipation device is more flexible in that the volume of the cold head 610 and the cold row 611 is smaller than the volume of the traditional heat dissipation fins, and the choices of their shapes and structural positions are more diverse. Since the cold head 610 and the cold row 611 are connected through a pipe and are always a circulatory system, the cold row 611 can be arranged close to the cold head 610 or may have other relative positional relationship with the cold head 610, which is determined by the space of the laser projection device.
  • the cold row 611 and the fluid replacement 612 are arranged close to the side of the housing of the whole machine.
  • the cold row 611 has a larger volume than the fluid replacement 612 and the cold head 610, so the fluid replacement 612 ,
  • the cold head 610 is arranged in one place, and the cold row 611 is arranged side by side with the two inside the casing of the whole machine.
  • a plurality of circuit boards 500 and a second fan 605 are also arranged, and the second fan 605 is arranged close to the housing 101 of the whole machine ( That is, the second fan 605 is located on the side of the multiple circuit boards 500 away from the optical engine 200 and the lens 300); the number of the second fan may be one or more.
  • the laser projection device of this example has two main heat dissipation paths, path a and path b.
  • path a and path b the heat of the DMD chip, the core component of the optical engine, is conducted along the path a; the heat of the light source 100 can be conducted along the path a and the path b at the same time, and more heat is conducted along the path b.
  • the light source 100 is arranged on the left side of the entire device, the optical engine 200 and the lens 300 are located in the middle of the device, and the circuit board is arranged on the right side of the device.
  • the air flow flows from left to right along path a and path b, and the main paths of path a and path b are basically parallel.
  • the light source 100 is a laser light source, and the included laser components of different colors have different operating temperature requirements.
  • the working temperature of the red laser component is less than 50°C
  • the working temperature of the blue laser component and the green laser component is less than 65°C.
  • the working temperature of the DMD chip in the optical machine is usually controlled at about 70°C
  • the temperature of the lens part is usually controlled below 85°C.
  • the temperature control of different electronic devices is different, usually between 80°C and 120°C. It can be seen that because the optical part and the circuit part of the device have different temperature tolerances, the operating temperature tolerance of the optical part is generally lower than that of the circuit part. Therefore, the airflow is blown from the optical part to the circuit part, so that both parts can achieve the purpose of heat dissipation. And maintain their normal work.
  • path a As shown in Figure 6B, it is located in the upper part of the device.
  • the air flow of path a mainly takes away the heat of the light valve in the optical engine 200, flows through a part of the circuit board 500, and is discharged out of the casing through the second fan 605.
  • the light valve DMD chip
  • the radiator 240 is air-cooled and dissipated by the fourth fan 607, so that the airflow flows through part of the circuit board along the path a.
  • the second fan 605 is a suction fan, and
  • the airflow formed by the fourth fan 607 flows in the same direction, which enables the airflow formed by the fourth fan 607 to flow through the radiator and still has a relatively high flow rate after a plurality of circuit boards, so that the hot airflow can be smoothly discharged out of the housing of the whole machine.
  • path b As shown in Figure 1B, it is located in the lower half of the device.
  • the cold row 611 and the heat dissipation fins 601 are sequentially arranged along the path b direction.
  • One side of the heat dissipation fin 601 is the cold row 611 and the other side is the lens 300.
  • a first fan 604 is provided between the cold row 611 and the heat dissipation fins 601.
  • the first fan 604 is a suction fan for the cold row 611.
  • the heat dissipation fin 601 is a blowing fan.
  • the first fan 604 sucks the heat of the cold row 611 away to form a first air flow, and blows it toward the heat dissipation fin 601.
  • the heat dissipation fin 601 has multiple sets of parallel air ducts. After passing through the surface of the heat dissipation fins and the internal air ducts, a second airflow is formed, and the second airflow is blown toward the lens 300.
  • the second airflow can flow along the periphery of the lens 300 housing and the bottom space of the lens 300, taking away the lens The heat on the surface of the housing.
  • the working temperature of the red laser component is less than 50°C, for example, when it is controlled below 45°C, liquid cooling is used, and the difference between the surface temperature of the cold row and the surface temperature of the cold head is controlled within the range of 1 to 2°C.
  • the surface temperature of the cold row is 43°C to 44°C, where the surface temperature of the cold head refers to the temperature of the contact surface between the cold head and the heat sink of the laser assembly.
  • the first fan sucks in air of ambient temperature, which is usually 20-25°C, and cools the cold row to dissipate heat, reducing the surface temperature of the cold row to 43°C.
  • the working temperature of the blue laser component and the green laser component is below 65°C
  • the temperature of the heat dissipation fin needs to be 62°C to 63°C
  • the temperature difference between the temperature of the heat dissipation fin and the heat sink of the laser assembly is in the range of 2 to 3°C Inside. It can be seen that the temperature of the cold row is lower than the temperature of the heat dissipation fins. Therefore, the cold row is arranged at the front end of the heat dissipation path, and is also located before the heat dissipation fins in the heat dissipation path. The air flow formed by the rotation of the fan dissipates heat from the cold row and then blows to the radiating fins again, which can still dissipate the heat of the radiating fins.
  • the working temperature of the lens is controlled at 85°C and the temperature of the heat dissipation fins is at 63°C, which is still lower than the working temperature of the lens, the second airflow flowing through the heat dissipation fins is still cold airflow compared to the lens.
  • the operating temperature of the circuit board is generally higher than the operating control temperature of the lens. Therefore, the airflow after dissipating heat from the lens is still cold airflow compared to most circuit boards, and it can continue to flow through multiple circuit boards for heat dissipation.
  • path b because there are many heat source components that need to be dissipated, the airflow resistance is also relatively large. In order to enhance the flow rate, the hot airflow in this path quickly dissipates out of the overall housing, on the airflow outflow side of the circuit board, close to the whole A second fan 605 is also provided on the casing.
  • the number of the second fan 605 is multiple, and a part of the second fan 605 is configured to form a heat dissipation path a; the other part of the second fan 605 and the first fan 604 are driven together
  • the airflow sequentially flows through the cold row 611, the heat dissipation fins 601, the lens 300 and at least part of the circuit board 500, forming a heat dissipation path b.
  • the first fan may also be arranged at the front end of the cold exhaust, that is, the first fan may be arranged between the housing of the whole machine and the cold exhaust. At this time, the first fan is a blowing fan relative to the cold row. At this time, the wind blown by the first fan is first blown to the cold row and then to the heat dissipation fins.
  • a third fan 606 can be arranged between the heat dissipation fins and the lens.
  • the third fan 606 is opposite to the heat dissipation fins 601. It is said to be a suction fan.
  • the lens 300 it is a blowing fan. This is equivalent to accelerating the second air flow, enhancing the flow rate, and enhancing the ability to carry heat.
  • the third fan 606 blows the second air flow toward the circuit board and is discharged out of the housing through the second fan 605.
  • the airflow is basically linear, with few twists and turns, which can reduce the resistance of the airflow, and facilitate the airflow to quickly flow away at a faster flow rate after carrying heat, which is convenient for Heat dissipation of heat source components.
  • the cold exhaust, heat dissipation fins, lenses, and circuit boards have gradually increased operating temperature thresholds.
  • the above-mentioned structural layout also facilitates the design of heat dissipation paths.
  • the heat dissipation airflow can flow from components with lower operating temperature thresholds to operating temperature thresholds.
  • Higher components can dissipate heat for multiple heat source components in sequence in a heat dissipation path, which not only meets the working heat dissipation requirements of multiple heat source components, but also has high heat dissipation efficiency of the whole machine.
  • the cold row can also be arranged in the heat dissipation path a, that is, in the same heat dissipation path as the DMD chip.
  • structural improvements on the surface of the heat dissipation fins can be used to increase the heat dissipation area, or to increase the wind velocity, so as to increase the heat dissipation capacity.
  • the luminous power range of the red laser component can be 24W ⁇ 56W
  • the luminous power range of the blue laser component can be 48W ⁇ 115W
  • the luminous power range of the green laser component can be 12W ⁇ 28W.
  • the luminous power of the red laser component is 48W
  • the luminous power of the blue laser component is 82W
  • the luminous power of the green laser component is 24W.
  • the above-mentioned three-color lasers all use MCL laser components. Compared with BANK type laser components, under the same output power, the volume of MCL type laser components is greatly reduced.
  • the heat dissipation requirement of the light source 100 is the most stringent, which is a relatively low temperature control part of the entire equipment.
  • the working temperature of the red laser component is lower than the working temperature of the blue laser component and the green laser component, which is determined by the light emitting principle of the red laser.
  • the blue laser and the green laser are generated using gallium arsenide luminescent material, and the red laser is generated using gallium nitride luminescent material.
  • the luminous efficiency of the red laser is low and the heat generation is high. Red laser luminescent materials have more stringent temperature requirements.
  • the air-cooled heat dissipation method can control the temperature difference between the hot end and the cold end of the heat source at about 3°C, while the temperature difference control for liquid cooling can be more precise and smaller, such as 1 to 2°C.
  • the temperature difference control for liquid cooling can be more precise and smaller, such as 1 to 2°C.
  • red laser components with a lower operating temperature threshold liquid-cooled heat dissipation (that is, using the first heat dissipation device) is adopted, while blue laser components and green laser components with relatively high operating temperature thresholds are air-cooled for heat dissipation (that is, using the first heat dissipation device).
  • the second heat dissipation device can dissipate the red laser at a lower heat dissipation cost while meeting the operating temperature requirements of the red laser, and only need to meet the smaller temperature difference control, so that the fan speed requirement can be reduced.
  • the component cost of liquid cooling is higher than that of air cooling.
  • a liquid-cooled and air-cooled hybrid heat dissipation method is adopted for the heat dissipation of the light source, which can meet the operating temperature control of different laser components and is economical and reasonable.
  • the metal substrate on the back of the red laser component 110 is connected to the cold head through a first heat conducting block 613.
  • the area of the first heat conducting block 613 is larger than the area of the heat conducting surface of the cold head.
  • the area is also larger than the area of the heat conducting surface of the heat sink on the back of the red laser component 110.
  • the outlet of the cold head 610 is connected to the inlet of the cold row 611 through a pipe, and the outlet of the cold row 611 is connected to the inlet of the cold head 610 through a pipe.
  • a liquid supplement 612 is also provided in the first heat dissipating device composed of cold head 610, cold row 611 and pipes.
  • the liquid supplement 612 is used to replenish the cooling liquid for the system circulation, so the liquid supplement can be equipped with the entire circulation system According to the system structure space and other factors, there can be one or more fluid replacement devices, which can be connected with the pump or be located close to the cold exhaust.
  • the blue laser component and the green laser component have the same operating temperature control and share a heat dissipation fin structure.
  • the heat sink on the back of the blue laser assembly 120 and the green laser assembly 130 is in contact with the heat pipe 602 through the heat conducting block 603, and the heat pipe 602 extends into the heat dissipation fin 601.
  • the heat conducting block 603 is the second heat conducting block, corresponding to the green laser component, and the heat conducting block 603 is the third heat conducting block.
  • the second heat conduction block and the third heat conduction block can be two independent components that conduct heat conduction for different laser components, or can be a whole structure, which is easy to install, and when the heat dissipation requirements of the two colors of laser components are the same, Easy to control temperature.
  • the heat pipe is a straight heat pipe, and there are multiple heat pipes, and multiple through holes are opened in the heat dissipation fin 601 for inserting multiple heat pipes.
  • the heat dissipation fins 601 are arranged close to the blue and green laser components. Multiple heat pipes can be directly inserted into the heat dissipation fins 601 without bending.
  • the straight heat pipes are beneficial to reduce the transmission resistance during the gas-liquid change in the heat pipes and improve the heat transfer efficiency.
  • the light source component can be radiated, thereby ensuring the normal operation of the three-color laser light source component.
  • the light source emits three-color lasers to provide high-quality illuminating light beams, which can be projected to form projection images with high brightness and good colors. Since the three-color laser components are arranged in different spatial positions, multiple optical lenses are needed in the cavity of the light source to combine and homogenize the laser beams in different directions.
  • the green laser light emitted by the green laser component 130 is reflected by the first light combining mirror 106 and then incident on the second light combining mirror 107.
  • the blue laser light emitted by the blue laser component 120 is transmitted through the second light combining mirror 107, and the green laser light is reflected and output by the second light combining mirror 107.
  • the blue laser and the green laser can be combined through the second light combining mirror 107. Output.
  • the output direction of the blue laser and the green laser that are combined by the second light combining mirror 107 is perpendicular to the output direction of the red laser emitted by the red laser assembly 110, and has an intersection.
  • a third combination is provided at the intersection of the three beams.
  • the light mirror 108 and the third light combining mirror 108 transmit red laser light and reflect green laser light and blue laser light. After passing through the third light combining mirror 108, the three-color laser beams are combined to form a beam that is incident to the homogenization element 109, and is emitted from the light outlet of the light source after the light spot is reduced by the condenser lens group 111.
  • the blue laser assembly 120 and the green laser assembly 130 are installed side by side on one side wall of the light source housing, and the red laser assembly 110 is installed on the other side wall of the light source housing 102.
  • the side walls of the two light source housings are in a vertical relationship.
  • the laser components of the three colors respectively output rectangular light spots. After each laser component is installed on the side wall of the light source housing, the long sides of the corresponding output rectangular light spots are perpendicular to the bottom wall of the light source housing.
  • the first light combining mirror 106 is arranged obliquely toward the light-emitting surface of the green laser assembly 130 and reflects the green laser light to the second light combining mirror 107.
  • the second light combining mirror 107 is arranged obliquely toward the light-emitting surface of the blue laser assembly 120, and transmits the blue laser light and reflects the green laser light to the third light combining mirror 108.
  • the first light combining mirror 106 and the second light combining mirror 107 are arranged approximately in parallel, and are arranged at 45 degrees to the light-emitting surface of the corresponding laser assembly.
  • the first light combining lens 106 and the second light combining lens 107 are clamped and fixed on the bottom wall of the light source housing 102 by a base. In consideration of assembly tolerance, the first light combining lens 106 and the second light combining lens The angle of 107 can also be fine-tuned, such as within plus or minus 3 degrees.
  • the third light combining mirror 108 is arranged obliquely toward the light-emitting surface of the red laser assembly 110, where the inclination angle of the third light combining mirror 108 is approximately 135 degrees inclined with respect to the optical axis direction of the red laser (that is, the third light combining mirror 108 and the The light combining mirror 107 is approximately vertical), the third light combining mirror 108 transmits the red laser light and reflects the blue and green laser light, and combines the three-color laser light to output to the converging lens group 111.
  • the third light combining mirror 108 is arranged close to the converging lens group 111.
  • the third light combining mirror 108 is also clamped and fixed on the bottom surface of the light source housing 102 by a base, and is set such that the installation angle can be finely adjusted within a range of 3 degrees.
  • the first light combining mirror is a reflecting mirror
  • the second light combining mirror and the third light combining mirror are both dichroic plates.
  • the light reflectance of the second light combining mirror and the third light combining mirror are both greater than their light transmittance.
  • the light reflectivity of the two light combining mirrors can reach 99%, and the transmittance is usually 95%-97%.
  • the three-color laser components provided in this example are all MCL laser components.
  • the MCL laser of the MCL laser component includes multiple light-emitting chips encapsulated on a metal substrate.
  • the light-emitting power of the color light-emitting chips is also different.
  • the light-emitting power of the green chip is about 1W per chip, while the light-emitting power of the blue chip is more than 4W per chip.
  • the above-mentioned three-color lasers are arranged with the same number of chips, for example, they all use a package type of 4 ⁇ 6 arrangement, and the overall light-emitting power is also different.
  • the light-emitting power of the green laser component is less than that of the red laser component. It is also less than the luminous power of the blue laser component, and the luminous power of the red laser component is less than the luminous power of the blue laser component.
  • the red laser component, the blue laser component, and the green laser component are packaged with the same array of light-emitting chips, for example, both are 4 ⁇ 6 arrays.
  • the red laser has a large divergence angle
  • the optical lens has a certain light receiving range or a better angle range.
  • Optical processing performance so that the longer the optical path or optical path that the red laser passes through, the more serious its divergence, resulting in the lower the optical processing efficiency of the red laser by the rear optical lens.
  • the luminous power of the red laser component is greater than the luminous power of the green laser
  • the optical loss rate of the red laser is greater than the optical loss rate of the green laser and the blue laser after passing through the same length of light path.
  • power ranking green ⁇ red ⁇ blue.
  • the light-emitting surface of the red laser assembly 110 faces the first light outlet 103 of the light source.
  • the red laser is output along the light-emitting surface of the red laser assembly, it passes through a transmission and passes through the homogenization element 109 and the converging lens.
  • the group 111 the light exits from the first light exit 103.
  • the blue laser it passes through a transmission first, and then enters the homogenization element 109 and the condensing lens group 111 and exits from the first light outlet 103 after a reflection; the green laser enters the homogenization element 109 and after three reflections.
  • the convergent lens group 111 emits light from the first light outlet 103.
  • the green laser is reflected three times.
  • the loss of each color laser beam during transmission can be better balanced, so that the power ratio of the three-color laser is close to the preset value.
  • the obvious imbalance is also conducive to the realization of the color ratio in line with the theoretical design and the desired white balance.
  • the arrangement of the above-mentioned three-color laser components is also conducive to heat dissipation according to the different heat dissipation requirements of the red laser component, the blue laser component and the green laser component.
  • Red laser components are more sensitive to temperature, and the working temperature is usually controlled below 50°C.
  • the working temperature of blue laser components and green laser components is higher than that of red laser components, and there is a significant temperature difference, usually controlled below 65°C.
  • arranging them together also facilitates sharing of heat dissipation structures for heat dissipation.
  • the red laser assembly is separately arranged in other positions of the light source housing, and is separated from the blue laser assembly and the green laser assembly at a certain distance, which can reduce the blue laser assembly and the green laser assembly as the high temperature heat source to the red as the low temperature heat source.
  • the heat radiation of the laser assembly reduces the heat burden of the red laser assembly.
  • the above-mentioned laser components all use MCL type laser components. Compared with the traditional BANK type laser components, the MCL type laser components have a significantly smaller volume. Therefore, in this embodiment, the light source of the laser projection device as shown in FIG. 1A and FIG. 5B , Its structural volume is significantly reduced compared to the traditional BANK-type laser components, so that more space can be reserved near the light source, which provides convenience for heat dissipation design. For example, the placement of radiators and fans will be more convenient. For flexibility, and it is also possible to set up structures such as circuit boards, which is also beneficial to reduce the length of the whole structure in a certain direction, or the volume of the whole machine.
  • the positions of the blue laser assembly and the green laser assembly can also be exchanged, such as shown in FIG. 5H.
  • the positions of the blue laser component 120 and the green laser component 130 are swapped so that the green laser component 130 is closer to the red laser component 110 than the blue laser component 120; at this time, the first laser component is the red laser component 110, and the first laser is red Laser; the second laser component is a green laser component 130, the second laser is a green laser; the third laser component is a blue laser component 120, and the third laser is a blue laser.
  • the green laser assembly 130 is arranged facing the second light combining mirror 107, and the blue laser assembly 120 is arranged facing the first light combining mirror 106.
  • the light path of the green laser is shorter than the light path of the blue laser, so as to two
  • the light loss rate of each person can be regarded as almost the same.
  • the red laser assembly is arranged close to the light exit of the light source, and the blue and green lasers pass through the turning light path and merge with the red laser, so that the optical path of the red laser is the shortest, which can reduce the transmission of the red laser.
  • Light loss, and the red laser only passes through the transmission of the optical element once, and the blue laser and the green laser are treated with multiple transflective treatments, so that the loss of the red laser in the transmittance of the optical element is also the lowest.
  • the red laser can be guaranteed
  • the light loss before beam combination is reduced as much as possible, which helps to maintain the ratio of the power and color of the three-color light source, so that the white balance of the system is close to the theoretical setting value, and a higher projection image quality is achieved.
  • the three-color laser passes through the light combining lens group (the light combining lens group includes a first light combining mirror, a second light combining mirror and a third combining lens. After the light mirror), the light beam must be homogenized and contracted through the homogenization element and the condensing lens group, so that the light collection efficiency and homogenization efficiency of the light receiving element in the rear light machine can be improved.
  • the light source 100 further includes a homogenizing element 109 and a converging lens group 111.
  • the homogenization element 109 is disposed between the third light combining lens 108 and the converging lens group 111.
  • the homogenization element is a homogenization diffusion sheet with regularly arranged microstructures, as shown in FIG. 9A. At present, the microstructure of the commonly used diffusion sheet is random and irregular, but the homogenization diffusion sheet used in the light source architecture utilizes a regularly arranged microstructure.
  • the homogenization diffuser uses a principle similar to that of a fly-eye lens to homogenize the beam, which can change the energy distribution of the laser beam from Gaussian to the shape shown in Figure 9B. As shown in Figure 9B, the energy near the center optical axis of the laser is greatly reduced. It weakens and becomes gentle, and the divergence angle of the laser beam is also increased, so that the effect of energy homogenization is much better than the commonly used diffuser with irregularly arranged microstructures.
  • the above-mentioned homogenization diffusion sheet may be provided with regularly arranged microstructures on one side, or may be respectively provided with regularly arranged microstructures on both sides.
  • the laser beam passes through the condenser lens group to reduce the spot size.
  • the high-energy laser beam is homogenized first, which can reduce the impact on the uneven energy distribution of the back-end components.
  • the homogenization is performed first, and the beam contraction can also reduce the beam spot after contraction. Difficulty of homogenization again.
  • the above-mentioned homogenization element 109 is a diffractive element, such as a linear grating or a two-dimensional grating (ie, a two-dimensional diffractive element), or a Fresnel lens.
  • a diffractive element such as a linear grating or a two-dimensional grating (ie, a two-dimensional diffractive element), or a Fresnel lens.
  • a better homogenization effect can also be achieved by configuring the homogenization element 109 as a diffraction element.
  • the convergent lens group includes a combination of two convex lenses, and any one of the two convex lenses includes at least one of a plano-convex lens, a double-convex lens, or a meniscus lens.
  • the combination of two convex lenses includes a double convex lens and a positive meniscus (positive meniscus) combination.
  • the meniscus lens refers to a lens whose concave surface (curvature of the concave surface) is smaller than that of the convex surface (curvature of the convex surface), that is, the radius of curvature of the concave surface of the meniscus lens is smaller than the radius of curvature of the convex surface.
  • the condensing lens group is used to converge the light beam, and the focus of the condensing lens group is set at the light receiving port of the rear light receiving element, that is, the focal plane of the converging lens group is located at the light incident surface of the light receiving element. Improve the light collection efficiency of the light collection element.
  • the above-mentioned converging lens group only includes a convex lens, so that the light beam can be condensed, and the number of lenses is reduced, and the structure of the converging lens group is simplified.
  • the converging lens group is located at the first light outlet 103 of the light source housing, for example, the rear lens in the converging lens group or the entire lens group is installed at the first light outlet 103, and
  • the shell around the convergent lens group 111 and the first light outlet 103 is filled with a sealing member, such as a sealing rubber ring.
  • a sealing member such as a sealing rubber ring.
  • the light receiving component 250 is a light pipe.
  • the light pipe has a rectangular light incident surface and a light exit surface.
  • the light pipe serves as both a light receiving part and a homogenizing part.
  • the light incident surface of the light pipe is the focal plane of the convergent lens group 111.
  • the convergent lens group 111 enters the condensed light beam into the light pipe.
  • the light beam undergoes multiple reflections inside the light pipe and exits from the light exit surface. Since a homogenization diffuser is arranged in the front light path, the homogenization of the light pipe can achieve a better homogenization effect of the three-color mixing and improve the quality of the illumination beam.
  • the light source is a pure three-color laser light source, and speckle is a unique phenomenon of laser.
  • speckle is a unique phenomenon of laser.
  • the three-color laser needs to be processed for de-speckle.
  • a diffusion wheel 260 that is, a rotating diffusion sheet, is also provided between the converging lens group 111 and the light receiving part 250.
  • the diffuser wheel 260 is located in the condensing light path of the converging lens group 111, and the distance from the wheel surface of the diffuser wheel 260 to the light incident surface of the light collecting part 250 (such as the light pipe) is about 1.5mm to 3mm, such as 1.5mm, 2.0mm, 2.5mm Or 3mm.
  • the diffuser wheel can diffuse the convergent beam, increase the divergence angle of the beam, and increase the random phase. Because the human eye has different sensitivity to speckles of different colors of laser light, the diffusion wheel can be partitioned. For example, the diffusion wheel is divided into a first zone and a second zone. The first zone is configured to transmit red lasers, and the second zone is configured to transmit blue lasers and green lasers. The divergence angle of the first zone is slightly larger than that of the second zone.
  • the diffusion wheel into three partitions, corresponding to red laser, green laser, and blue laser; among the above three partitions, the relationship between the divergence angle of each color laser partition is that the red laser partition has the largest divergence angle, and the blue laser The divergence angle of the color laser zone is the smallest.
  • the rotation period of the diffuser wheel can be consistent with the period of the light source.
  • the diffuser wheel is a diffuser, its rotation period is not particularly limited.
  • the light pipe has a certain light-receiving angle range. For example, light beams within the range of plus or minus 23 degrees can enter the light pipe and be used by the rear-end illumination light path, while other large-angle light beams become stray light and are blocked, causing light loss.
  • the light exit surface of the diffusion wheel is arranged close to the light entrance surface of the light pipe, which can increase the amount of light that the laser beam is collected into the light pipe after diffusion and improve the light utilization rate.
  • the above-mentioned light-receiving component is a fly-eye lens.
  • the homogenization diffuser 109 is arranged in the front optical path, the light source beam is homogenized, is condensed by the condensing lens group 111, and enters the diffuser 260.
  • the laser beam passes through a stationary diffuser (homogenization diffuser 109), and then a moving diffuser (diffuser 260).
  • the laser beam is diffused and homogenized again, which can enhance the homogenization effect of the laser beam, reduce the energy ratio of the beam near the optical axis of the laser beam, and reduce the laser beam
  • the degree of coherence can greatly improve the speckle phenomenon of the projected image.
  • the light source 100 may include at least one of the above-mentioned homogenization diffusion sheet 109, the condenser lens group 111 and the diffusion wheel 260.
  • the homogenizing diffuser 109, the converging lens group 111 and the diffuser 260 are arranged in order. When one or two of them are omitted, the arrangement order of the homogenizing diffuser 109, the converging lens group 111 and the diffuser 260 remains unchanged.
  • the light pipe homogenizes the light again.
  • the inventors of the present disclosure measure the spot distribution on the light entrance surface of the light pipe to show a relatively obvious inner and outer circle. Color boundary phenomenon. For example, in the schematic diagram of the light spot shown in Fig. 10, the convergent light spot is circular, the outermost circle is red, and the inward is purple, blue and other concentric circles.
  • the divergence angle of the fast and slow axis of the red laser assembly is larger than the divergence angle of the blue laser and the green laser due to the different light emitting principles.
  • the three-color laser components are arranged in an array with the same number of chips, and the size is consistent in terms of volume appearance, but due to the characteristics of the red laser itself, this makes the red laser beam's spot size during the transmission process larger than the blue The spot size of laser and green laser.
  • This phenomenon already exists when the three-color combined light is performed, and as the transmission distance of the light path increases, its divergence angle increases faster than other colors of laser light, so that although the three-color combined light will be homogenized, The beam is reduced and may be diffused and homogenized again by the rotating diffuser, but there will always be a larger spot size of the red laser.
  • the test spot on the light entrance surface of the light pipe also showed this phenomenon.
  • the length of the light pipe can be increased to improve the homogenization effect of light mixing, but this will increase the length of the light path and increase the structural volume.
  • a solution is proposed.
  • a first diffuser is provided in the optical path of the blue laser, and the first diffuser is configured as Diffuse and transmit the blue laser; and a first diffusion sheet is arranged in the optical path of the green laser, and the second diffusion sheet is configured to diffuse and transmit the green laser.
  • the first diffusion sheet is arranged between the light-emitting surface of the blue laser assembly and the corresponding light combining mirror, and the second diffusion sheet is arranged between the light-emitting surface of the green laser assembly and the corresponding light combining mirror.
  • this example also provides another solution.
  • a third piece of optical path is set in the combined light path of the blue laser and the green laser.
  • the diffuser 112 diverges the blue laser and the green laser before combining with the red laser beam.
  • the third diffuser 112 is arranged with the second light combining mirror 107 to enter the light path between the third light combining mirror 108.
  • the blue laser and the green laser can be expanded, for example, set to a diffusion angle of 1 degree to 3 degrees, passing through the third diffuser After 112, the expanded blue laser and green laser are combined with the red laser.
  • the spot size of the three-color laser is the same, and the spot overlap is improved.
  • the three-color spot with a higher degree of coincidence is also conducive to the homogenization and speckle reduction of the subsequent optical path, and the beam quality is improved.
  • a telescope system 113 is provided in the optical path of the red laser.
  • the telescope system 113 is configured to transmit the red laser light and reduce the beam of the red laser light.
  • the telescope system includes a convex lens 1131 and a concave lens 1132.
  • the convex lens 1131 is closer to the red laser assembly than the concave lens 1132, so that the red light beam emitted by the red laser assembly can be reduced. Among them, as shown in FIG.
  • the convex lens 1131 is a plano-convex lens, the plano-convex lens has opposite flat and convex surfaces, and the convex surface of the plano-convex lens faces the red laser component 110;
  • the concave lens 1132 is a plano-concave lens, and the plano-concave lens has opposite flat and concave surfaces.
  • the concave surface faces the plane of the plano-convex lens.
  • the laser light emitted by the laser is linearly polarized.
  • the red laser emits light in a different mode from that of the blue laser and the green laser.
  • the polarization direction of the red laser linearly polarized light is different from that of the blue laser linearly polarized light.
  • the polarization direction of the linearly polarized laser light is 90 degrees, the red laser is P-ray polarized light, and the blue laser and green laser are S-ray polarized light.
  • the polarization direction of the light beam emitted by the red laser assembly is 90 degrees to the polarization direction of the light beam emitted by the blue laser assembly and the green laser assembly.
  • the red laser is P light
  • the blue laser and green laser are S light.
  • the three-color light beam projected and imaged by the laser projection device has different polarization directions.
  • laser projection equipment in order to better restore color and contrast, laser projection equipment usually needs to be matched with a projection screen with higher gain and contrast, such as an optical screen, which can better restore high brightness and high contrast projection images.
  • FIG 4A shows an ultra-short throw projection screen, which is a Fresnel optical screen.
  • the Fresnel optical screen includes a substrate layer 401, a diffusion layer 402, a uniform medium layer 403, a Fresnel lens layer 404 and a reflective layer 405.
  • the thickness of the Fresnel optical screen is usually between 1 mm and 2 mm, and the substrate layer 401 occupies the largest proportion of the thickness.
  • the substrate layer 401 also serves as a support layer structure of the entire screen, and has a certain light transmittance and hardness.
  • the projection light beam first transmits through the base layer 401, then enters the diffusion layer 402 for diffusion, and then enters the uniform medium layer 403.
  • the uniform medium layer 403 is a uniform light-transmitting medium, such as a medium of the same material as the base layer 401.
  • the light beam transmits through the uniform medium layer 403 and enters the Fresnel lens layer 404.
  • the Fresnel lens layer 404 converges and collimates the beam.
  • the collimated beam is reflected by the reflective layer and then folded back through the Fresnel lens 404, uniform medium layer 403, diffusion layer 402, and base material layer 401, and is incident on the user In the eyes.
  • the inventors of the present disclosure discovered that the ultra-short-focus projection screen using the above-mentioned three-color laser light source will have partial color casts, resulting in "color spots", “color blocks” and other chromaticity unevenness.
  • the reason for this phenomenon is that in currently used three-color lasers, the polarization directions of laser beams of different colors are different.
  • the transmittance of optical lenses for P light is relatively greater than that of S The transmittance of light.
  • the ultra-short-throw projection screen due to the structure of the screen material, with the change of the incident angle of the ultra-short-throw projection beam, the ultra-short-throw projection screen itself will exhibit obvious changes in the transmittance and reflectance of the beams with different polarization directions.
  • the reflectivity of the projection screen to the red projection beam of the P light type is different from that of the red projection beam of the S light type. More than 10%.
  • the reflectivity of the ultra-short throw projection screen to P light is greater than that of S light, which will cause more P light to be reflected by the screen and enter the human eye, while the S light reflected by the screen and enter the human eye is relatively cut back.
  • This phenomenon of difference in transmission and reflection of light of the same color with different polarization directions also exists when the projected beam is of other colors.
  • the three primary colors are in different polarization states, after passing through the above-mentioned projection optical system and the projection screen, this difference in transmission and reflection (especially the relatively obvious difference in transmission and reflection on the projection screen) will cause different colors of light to be reflected by the screen.
  • the luminous flux entering the human eye is unbalanced, which eventually leads to a partial color cast on the projection screen, which is especially obvious when presenting a color screen.
  • the blue laser component and the green laser component are arranged adjacent to each other, and a phase retarder (for example, a half-wave plate) is provided in the output path of the blue laser and the green laser before being incident on the third light combining mirror to Change the polarization direction of the blue laser and the green laser to make it the same as the polarization direction of the red laser, so as to solve the phenomenon of color cast in the projected image due to the different polarization directions.
  • a phase retarder for example, a half-wave plate
  • the phase retarder corresponds to the wavelength of a certain color, and the degree of phase change of the transmitted light beam is affected by the thickness of the crystal growth.
  • the phase retarder is a half-wave plate, also called a ⁇ 1/2 wave plate, which can change the phase of the light beam corresponding to the color wavelength by ⁇ , that is, 180 degrees, and rotate the polarization direction of the corresponding color wavelength by 90 degrees, such as Change P light to S light, or change S light to P light.
  • the half-wave plate is a crystal, and the crystal has its own optical axis W, which is located in the plane of the half-wave plate.
  • the half-wave plate is arranged in the optical path and is perpendicular to the optical axis O of the light source, so the optical axis W of the half-wave plate and the optical axis O of the light source are perpendicular to each other.
  • a coordinate system is established with the optical axis W of the half-wave plate, and the coordinate system formed by the P-polarized light along the optical axis W and the direction perpendicular to the optical axis W has components Ex and Ey.
  • Ex and Ey can be expressed by light wave formula.
  • P light can be regarded as a spatial synthesis of two-dimensional waves of components Ex and Ey.
  • the phase changes by ⁇ , that is, 180 degrees.
  • the phase constants of Ex and Ey both have a change of ⁇ .
  • the phase of the light waves b0, c0, and a0 is changed by 180 degrees, and after the light waves of the two direction components are superimposed, the polarization position of the light waves in space changes, forming b1, c1 , A1, which becomes light in the S polarization direction.
  • the above-mentioned changes in the spatial positions of b0, c0, a0 and b1, c1, a1 are only examples.
  • the light originally in the P polarization direction becomes light in the S polarization direction.
  • the two polarization directions are perpendicular to each other.
  • phase retarders of corresponding wavelengths are respectively arranged in the light exit paths of the blue laser assembly and the green laser assembly, and the phase retarders are, for example, half-wave plates.
  • the center wavelength of the blue laser is about 465 nm
  • the center wavelength of the green laser is about 525 nm.
  • the first half-wave plate 121 ie, the first phase retarder
  • the second half-wave plate 131 that is, the second phase retarder
  • the polarization directions of both the green laser and the blue laser can be changed by 90 degrees, from S light to P light.
  • the above-mentioned half-wave plates (for example, the first half-wave plate 121 and the second half-wave plate 131) are arranged in the light source housing, and are located inside the light combining mirror corresponding to the laser assembly. In between, the half-wave plate is fixed by setting a lens base on the bottom wall of the light source housing.
  • the above-mentioned half-wave plates (for example, the first half-wave plate 121 and the second half-wave plate 131) are arranged on the inside of the window opened for the laser assembly on the light source housing, such as being fixed by means of glue or a fixing bracket. Inside the window.
  • the above-mentioned half-wave plates (for example, the first half-wave plate 121 and the second half-wave plate 131) are arranged between the laser assembly and the outside of the light source housing window, for example, the half-wave plate is mounted or fixed on Outside the window, the laser assembly (including the fixing bracket) is installed on the installation position outside the window through the fixing bracket.
  • half-wave plates when sealing glass is provided at the window glass, half-wave plates (for example, the first half-wave plate 121 and the second half-wave plate 131) may be located between the sealing glass and the light-emitting surface of the laser assembly.
  • a supporting table (not shown in the figure) on the front of the transparent window frame 1041 of the fixing bracket of the laser assembly, and the half-wave plate 140 can be fixed on the supporting plate by gluing. Lean on the stage.
  • 5C-2 shows a schematic diagram of the half-wave plate installed on the front of the fixing bracket, where the half-wave plate 141 is installed at the position of the light-transmitting window frame 1041 of the fixing bracket and is fixed by dispensing glue on the surrounding glue groove 104A.
  • the length and width ranges of the half-wave plate 141 are 25-30 mm and 21-28 mm, respectively; the length and width ranges of the light-transmitting window frame of the fixing bracket are 20-24 mm and 18-20 mm, respectively.
  • the half-wave plate is 30mm*28mm, and the size of the transparent window frame is 24mm*20mm.
  • the half-wave plate 141 After the half-wave plate 141 is fixed to the fixing bracket 104, it is installed on the installation position of the window 1021 of the light source housing 102 together with the MCL laser assembly installed on the fixing bracket. As mentioned above, the installation position of the window 1021 of the light source housing is also provided with a second accommodating groove for accommodating the second sealing member 1052. The sealing glass 105 is covered by the first sealing member 1051 and the second sealing member on the laser assembly. 1052 is caught in the middle. Based on the above structure, after the light beam of the laser assembly is emitted from the light-emitting chip, it passes through the half-wave plate 141 and the sealing glass 105 in sequence, and then enters the interior of the light source housing from the window 1021 of the light source housing.
  • half-wave plates of corresponding colors are installed on the fixing brackets of the blue laser assembly and the green laser assembly, so that after passing through the corresponding half-wave plates, the polarization of the light beam changes by 90 degrees.
  • the green laser light is already P light when it enters the first light combining mirror
  • the blue laser light is already P light when it enters the second light combining mirror, so the blue laser and green laser light are combined through the second light combining mirror and output
  • the light beams are all P-polarized light, which is the same as the polarization direction of the red laser.
  • the third light combiner combines the three-color light beams with the same polarization direction to output, and then undergoes homogenization and contraction treatments, enters the light path of the opto-mechanical illumination, is reflected by the DMD chip and enters the lens, and the lens is projected onto the screen for imaging. Due to the same polarization direction of the three colors, the phenomenon of uneven chromaticity such as "color spots" and "color blocks” in the projection screen can be eliminated or greatly alleviated.
  • the blue laser and the green laser are combined first and then combined with the red laser.
  • the half-wave plate can also be set in the blue laser and the green laser.
  • FIG. 12B another schematic diagram of the principle of the optical path of the light source is provided.
  • the fourth half-wave plate 141 (that is, the fourth phase retarder) can be arranged between the second light combining mirror 107 and the third light combining mirror 108. Meanwhile, the combined light beam of the blue laser and the green laser emitted from the second light combining mirror 107 is transmitted.
  • the green laser and the blue laser respectively output S-polarized light
  • the green S light enters the first light combining mirror 106 and is reflected
  • the blue S light enters the second light combining mirror 107 and is transmitted.
  • the second light combining mirror 107 also reflects green S light, where the second light combining mirror 107 is a dichroic plate selected based on wavelength rather than polarization state.
  • the second light combiner 107 combines the blue laser and the green laser, both of which are S light, and passes through the fourth half-wave plate 141.
  • the fourth half-wave plate 141 changes the polarization direction of the green laser and the blue laser, and then enters The third light combining mirror 108.
  • the fourth half-wave plate 141 can be set for the wavelength of one of the colors, for example, for the wavelength of the green laser, the green laser passes through the fourth half-wave plate 141. After the polarization direction is rotated by 90 degrees, the original S light is changed to P light. After the blue laser passes through the fourth half-wave plate 141, since the wavelength of the half-wave plate does not correspond to the blue wavelength, the polarization direction of the blue laser is not 90 degrees, but close to the P polarization direction. The visual function is low, and the sensitivity to blue is low. Therefore, the visual discomfort when the color cast occurs in blue is not as obvious as the color cast in red and green.
  • the fourth half-wave plate 141 is set for the middle value of the blue and green center wavelengths, so that the polarization direction of the green laser and the blue laser are not 90 degrees, but both are close to 90 degrees.
  • the green laser is not deflected from S light to P light, but neither is the original S light polarization state. It can also improve the consistency of the light processing process of the red, green, and blue primary colors of the entire system, and improve the local area on the projection screen.
  • Technical problems such as "color spots” and "color blocks” appearing to have uneven chromaticity, the principle of which will not be repeated.
  • the half-wave plate 141 may be fixed by a fixing base provided on the bottom wall of the light source housing.
  • FIG. 12D Based on the schematic diagram of the optical path of the light source shown in FIG. 12B, a schematic diagram of the optical principle of a laser projection device can be shown in FIG. 12D, and its working process is referred to the foregoing, and will not be repeated.
  • a fourth half-wave plate 141 is provided in the combined light path of the blue laser and the green laser.
  • the third diffuser 112 may be provided at the same time, or not. Then a third diffusion sheet 112 is provided.
  • the arrangement relationship of the blue laser component and the green laser component is not limited, that is, the positions of the blue laser component and the green laser component can be exchanged.
  • half-wave plate arrangement shown in FIGS. 12B and 12D is also applicable to the optical path architecture provided in the optical path schematic diagram shown in FIGS. 5G, 5H, 8A, 8B, or 8C. Its working principle is the same as above and will not be repeated.
  • the same optical lens has a slight difference in the transmittance of P light and S light at different wavelengths, and the reflectance of P light and S light also has a slight difference.
  • the optical lens here includes various optical lenses in the entire laser projection device, such as a convergent lens group, a lens group in the light path of an optical machine, and a refractive lens group in the lens. Therefore, when the light beam emitted by the laser light source passes through the entire projection optical system, this difference in transmission and reflection is the result of the superposition of the entire system and will be more obvious.
  • the red laser light is P linearly polarized light
  • the blue laser and green laser light are S linearly polarized light.
  • the selective transmission of P light and S light is more obvious.
  • the transmittance of the projection screen for P light red light
  • S light green and blue
  • half-wave plates are provided in the light exit paths of the blue laser and the green laser.
  • the half-wave plates can be used in a targeted manner.
  • the polarization direction of blue laser and green laser can be changed by 90 degrees.
  • the polarization direction of the S light is changed to the polarization direction of the P light, which is consistent with the polarization direction of the red laser, so that when passing through the same set of optical imaging system and reflecting into the human eye through the projection screen, it becomes the P-polarized light.
  • the transmittance of the blue laser and the green laser in the optical lens is equivalent to the transmittance of the red laser that is originally P light, the consistency of the light processing process is close, and the difference in reflectivity of the projection screen to the three-color laser is also reduced ,
  • the entire projection system has improved the consistency of the light processing process of the three-color primary color light, which can fundamentally eliminate the color cast phenomenon of "color spots” and "color blocks” in local areas on the projection screen, and improve the display quality of the projection screen.
  • the polarization direction of the green laser or the blue laser can be changed by 90 degrees, Or the polarization directions of the two colors of laser light are not changed to 90 degrees, but both are close to 90 degrees. In this way, the polarization difference between the S light of the blue laser light and the green laser light and the red laser light P light can also be reduced. Based on the above principles, it can also improve the consistency of the light processing process for the three primary colors of red, green and blue in the entire system, and can improve the technical problems of uneven chromaticity such as "color spots" and "color blocks” in local areas on the projection screen. .
  • the transmittance of the optical lens to P-polarized light in the optical system is generally greater than the transmittance of S-polarized light
  • the projection screens used in some examples of the present disclosure have a greater reflectivity for P-polarized light than for S-polarized light. Reflectivity, therefore, by converting the S-polarized blue laser and green laser into P-polarized light, so that the red, green, and blue lasers are all P light, and the light transmission efficiency of the projection beam in the entire system can be improved. It can increase the brightness of the entire projection screen and improve the quality of the projection screen.
  • some embodiments of the present disclosure provide a laser projection device, as shown in FIG. 12C. light source.
  • a half-wave plate corresponding to the red wavelength is provided before the red laser beam is combined with the blue and green laser beams.
  • the third half-wave plate 151 ie, the third phase retarder
  • the third half-wave plate 151 is disposed between the red laser assembly 110 and the third light combining mirror 108.
  • the third half-wave plate 151 is disposed in the light source housing, and is located in the light path between the inner side of the light source housing and the third light combiner. By providing a lens base on the bottom wall of the light source housing, The third half-wave plate 151 is fixed.
  • the third half-wave plate 151 is disposed inside the window opened for the red laser assembly on the light source housing, for example, is fixed on the inside of the window by means of glue or a fixing bracket.
  • the third half-wave plate 151 is disposed between the red laser assembly and the outside of the window of the light source housing.
  • the third half-wave plate 151 is mounted or fixed on the outside of the window, and the laser assembly (including a fixing bracket) Then install it on the installation position outside the window through a fixed bracket.
  • the third half-wave plate 151 may be located between the sealing glass and the light-emitting surface of the laser assembly.
  • the specific installation method can also refer to the introduction of FIG. 5E-2, which will not be repeated here.
  • the third half-wave plate 151 is set corresponding to the wavelength of the red laser. Similarly, the polarization direction of the red laser can be rotated 90 degrees through the third half-wave plate 151, and the red laser is changed from P-polarized light to S-polarized light.
  • the red laser that was originally P-polarized light is converted into S-polarized light, which is consistent with the polarization directions of the blue laser and green laser.
  • the polarization directions of the three colors are the same.
  • the transmittance of the projection optical system to the red laser, blue laser, and green laser of the same S-polarized light is reduced compared with that of polarized light in different polarization directions.
  • the reflectivity of the three-color light with the same S-polarized light is also basically the same, so that the light processing consistency of each primary color is improved, and the phenomenon of "color spots" and "color blocks" in the projection screen can be eliminated or improved.
  • the laser light emitting surface is rectangular.
  • the phase retarder is correspondingly arranged in the light output path of one color or two colors, and its shape is also rectangular.
  • the long side and the short side of the rectangular light-emitting area of the laser are respectively parallel to the long side and the short side of the rectangular light-receiving area of the phase retarder.
  • the performance of optical lenses (such as lenses and prisms) will be accompanied by temperature changes during the working process.
  • an optical lens has internal stress formed during the manufacturing process, and this internal stress is released with temperature changes, resulting in stress birefringence.
  • This kind of stress birefringence will cause different phase delays for beams of different wavelengths, which can be regarded as secondary phase delays. Therefore, in the actual optical path, the phase change of the beam is based on the superimposed effect of the stress birefringence of the half-wave plate and the optical lens, and the inherent retardation caused by this optical lens will vary according to the system design.
  • the secondary phase delay caused by the actual system can be corrected to approach or reach the theoretical value that the polarization direction of the beam changes by 90 degrees.
  • Each half-wave plate has an optical axis in the plane where its flat plate is located.
  • the optical axis W of the half-wave plate is in a spatially vertical relationship with the optical axis O of the system, and the optical axis of the half-wave plate is parallel to the half-wave plate.
  • Long side or short side When applying the above solution, as shown in Figure 11D, the half-wave plate is set as follows: along the long or short side of the rectangular half-wave plate, rotate the half-wave plate at a preset angle, such as C degrees, as shown in the figure Shown by the dotted line.
  • the optical axis of the half-wave plate is also deflected by plus or minus C degrees, so that the phase of the beam is changed to about 180 degrees ⁇ 2C degrees, and then superimposed with the secondary phase delay of the system optical lens , Finally make the polarization direction of the beam change about 90 degrees to approach the theoretical design value.
  • C may take the value 10.
  • the laser projection light source has three primary colors with different polarization directions
  • by arranging a half-wave plate in the light output path of one color or two colors in the light source of the laser projection device Change the polarization direction of the light corresponding to one or two colors to be consistent with the polarization direction of other colors, so that the polarization directions of the three primary colors output by the laser projection device are the same. Therefore, when the laser beam emitted by the light source of the laser projection device passes through the same set of optical imaging system and is reflected by the projection screen into the human eye, the optical system has a close transmittance to the three-color laser light.
  • the difference in reflectivity is also reduced, and the consistency of the light processing process of the three-color primary color light in the entire projection system is improved, which can fundamentally eliminate the "color spots” and "color blocks” that appear in local areas on the projection screen.
  • the uniform phenomenon improves the display quality of the projected picture.
  • the red laser is used as the P light
  • blue and green lasers are examples of S light, and are not limited to this combination of P light and S light.
  • Those skilled in the art can combine the color and polarization direction of the actual light beam with the embodiment of the application.
  • the core principles of the company are adaptively changed, and the above-mentioned changes should also be within the scope of protection of this application.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

一种激光光源（100），包括：第一激光器组件，配置为发出第一激光；第二激光器组件，配置为发出第二激光；第三激光器组件，配置为发出第三激光；以及，第一合光镜（106），设置在与第三激光器组件相对的位置处，并被配置为反射第三激光；第二合光镜（107），设置在第三激光与第二激光的交汇处，并被配置为透射第二激光、反射第三激光；第三合光镜（108），设置于第一激光与经过第二合光镜后的第二激光和第三激光的交汇处，并被配置为透射第一激光、反射第二激光和第三激光，以使第一激光、第二激光与第三激光射向激光光源的出光口。

Description

激光光源和激光投影设备
本公开要求于2019年03月20日提交中国专利局、申请号为201910214208.6，2019年06月20日提交中国专利局、申请号为201910538767.2，以及，2019年06月20日提交中国专利局、申请号为201910539490.5的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及激光投影技术领域，尤其涉及一种激光光源和激光投影设备。
背景技术
激光光源具有单色性好，亮度高，寿命长等优点，是较为理想的光源，被广泛应用于激光电视、激光投影仪等激光投影设备中。
发明内容
一方面，提供一种激光光源。所述激光光源包括：第一激光器组件，设置在第一平面上，并被配置为发出第一激光；第二激光器组件，设置在与所述第一平面垂直的第二平面上，并被配置为发出第二激光；第三激光器组件，在所述第二平面上与所述第二激光器组件并列设置；所述第二激光器组件比所述第三激光器组件更靠近所述第一激光器组件；所述第三激光器组件被配置为发出第三激光；第一合光镜，设置在与所述第三激光器组件相对的位置处，并被配置为反射所述第三激光；第二合光镜，设置在所述第三激光与所述第二激光的交汇处，并被配置为透射所述第二激光、反射所述第三激光；第三合光镜，设置于所述第一激光与经过所述第二合光镜后的所述第二激光和所述第三激光的交汇处，并被配置为透射所述第一激光、反射所述第二激光和所述第三激光，以使所述第一激光、所述第二激光与所述第三激光射向所述激光光源的出光口。
另一方面，提供一种激光投影设备。所述激光投影设备包括：整机壳体；安装于所述整机壳体内的激光光源，所述激光光源为如上述第一方面所述的激光光源；安装于所述整机壳体内的光机和镜头，所述光机和所述镜头连接，所述激光光源被配置为向所述光机提供照明。
附图说明
为了更清楚地说明本公开实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍。显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，还可以根据这些附图获得其他的附图。
图1A为本公开一些实施例中一种激光投影设备的整机结构示意图；
图1B为本公开一些实施例中一种激光投影设备的整机散热结构示意图；
图1C为本公开一些实施例中一种激光投影设备的光路原理示意图；
图2为本公开一些实施例中一种DLP投影架构的示意图；
图3A为本公开一些实施例中一种超短焦投影成像光路的示意图；
图3B为本公开一些实施中一种超短焦投影系统的示意图；
图4A为本公开一些实施例中一种超短焦投影屏幕的结构示意图；
图4B为图4A中投影屏幕对投影光束的反射率变化图；
图5A为图1A示出的激光投影设备中一种光源的结构示意图；
图5B为图5A的结构分解示意图；
图5C-1为本公开一些实施例中一种激光器组件的组装示意图；
图5C-2为本公开一些实施例中另一种激光器组的组装示意图；
图5D为本公开一些实施例中一种激光器组件的分解结构示意图；
图5E-1为本公开一些实施例中另一种激光器组件的分解结构示意图；
图5E-2为本公开一些实施例中又一种激光器组件的分解结构示意图；
图5F-1为一种MCL激光器的结构示意图；
图5F-2为图5F-1中激光器的电路封装结构的示意图；
图5G为本公开一些实施例中一种光源的光路原理示意图；
图5H为本公开一些实施例中另一种光源的光路原理示意图；
图5I为图5A示出的光源的另一角度的结构示意图；
图6A-1为本公开一些实施例中光源部分散热系统的结构示意图；
图6A-2为本公开一些实施例中光源部分散热系统的分解示意图；
图6B为本公开一些实施例中散热路径a示意图；
图6C为本公开一些实施例中红色激光器组件散热系统示意图；
图6D为本公开一些实施例中蓝色和绿色激光器组件散热系统的组装示意图；
图6E为本公开一些实施例中蓝色和绿色激光器组件散热系统的分解示意图；
图7为本公开一些实施例中红色激光器组件的发光芯片的结构示意图；
图8A为本公开一些实施例中一种激光投影系统的光路原理示意图；
图8B为本公开一些实施例中又一种激光投影系统的光路原理示意图；
图8C为本公开一些实施例中又一种激光投影系统光路原理示意图；
图9A为本公开一些实施例中一种扩散片的结构示意图；
图9B为本公开一些实施例中激光光束经过图9A所示的扩散片后的能量分布示意图；
图10为本公开一些实施例中激光器组件发出的激光光束形成的光斑示意图；
图11A为本公开一些实施例中一种半波片的光轴示意图；
图11B为本公开一些实施例中线偏振光发生90度改变的原理示意图；
图11C为本公开一些实施例中P光和S光偏振方向示意图；
图11D为本公开一些实施例中半波片旋转设置示意图；
图12A为本公开一些实施例中一种光路原理示意图；
图12B为本公开一些实施例中另一种光路原理示意图；
图12C为本公开一些实施例中又一种光路原理示意图；
图12D为本公开一些实施例的另一种激光投影设备的光学原理示意图。
具体实施方式
下面将结合附图，对本公开的一些实施例进行描述。显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本公开保护的范围。
在本公开的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，还可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本公开中的具体含义。
在说明书和权利要求书中，在明确声明的含义之外术语可以具有在上下文中暗示的细微差别的含义。同样地，短语“在一个实施例中”或“在一些实施例中”不一定指代相同的实施例，短语“在另一个实施例中”或“在其他实施例中”不一定指代不同的实施例。类似地，短语“在一个示例中”或“在一些示例中”不一定指代相同的示例，短语“在另一个示例中”或“在其他示例中”不一定指代不同的示例。例如，所要求保护的主题旨在全部或部分地包括示例性实施例或示例的组合。
首先根据图1A所示的激光投影设备，对本公开一些实施例的激光投影设备的结构和工作过程进行说明。
图1A示出了一种激光投影设备的结构示意图。如图1A所示，激光投影设备10包括整机壳体101和多个光学部分，所述多个光学部分包括光源100，光机200和镜头300。各光学部分(例如光源100、光机200或镜头300)具有对应的壳体进行包裹，并达到一定的密封或气密要求，比如，光源100通过其对应的外壳实现气密性密封，可以较好的改善光源100的光衰问题。
光源100、光机200和镜头300安装于整机壳体101中。其中，光机200和镜头300连接且沿着整机壳体101的第一方向X设置，以将整机壳体101内的空间分为第一区域M 1和第二区域M 2，第一区域M 1内设置有上述光源100，第二区域M 2内设置有至少一个电路板。如图1A所示，按照使用方式，第一方向X可以与用户观看的方向相对，而且第一方向X可以为整机的宽度方向。第一区域M 1位于镜头300和光机200的第一侧，即第一区域M 1指的是光机200、镜头300和一部分整机壳体101围合的空间。第二区域M 2位于镜头300和光机200的第二侧，即第二区域M 2指的是光机200、镜头300和另一部分整机壳体101围合的空间。光源100为纯三色激光光源，可以发出红色激光，蓝色激光和绿色激光，因此，光源100配置为向光机200提供照明光束。
参见图1A和图5B，光源100具有第一出光口103，光机200具有第二入光口201和第三出光口202，并且光机200内部设置有光调制器件。根据光机内部照明光路的设计，第二入光口201和第三出光口202位于光机呈垂直关系的不同侧壁上，此处的垂直是空间位置关系上的垂直，不同 的侧壁可以是呈长方体状的光机壳体的不同侧壁，也可以是呈不规则立体状的光机壳体的不同侧面。光源100的第一出光口103连接光机200的第二入光口201，光源100的光束进入光机200内部，然后到达光调制器件，由光调制器件对光束调制后通过光机200的出光口202输出至镜头300。
图1C示出了一种激光投影设备的光路原理图，如图1C所示，按照光学功能分为三个光学部分，即光源100、光机200和镜头300。其中光源100包含三色激光器组件和多个光学镜片，多个光学镜片对激光光束进行匀化，缩束处理。从光源100出射的光束入射至光机200。光机中包括光导管203，通常光导管203位于光机的前端，首先接收到光源射出的照明光束，光导管203具有混光和匀化的作用。光机中还包括一些透镜组，以使照明光束可以入射至光调制器件，比如光阀204，光阀204调制光束后，使光束入射至镜头300的透镜组中进行成像。
光机200中含有的光调制器件为系统的核心部件。光调制器件(比如光阀)可分为三片式LCD(Liquid Crystal Display，液晶显示)液晶光阀，LCOS(Liquid Crystal on Silicon，硅基液晶)液晶光阀，以及DMD(Digital Micromirror Device，数字微镜芯片)光阀。其中DMD光阀应用于DLP(Digital Light Processing，数字光处理)投影架构。
图2示出了一种DLP投影架构，其中DMD数字微镜阵列是整个投影架构的核心器件。以下以单片DMD应用为例进行说明。DMD220为反射式光阀器件，从光源100输出的照明光束通常还需要经过DMD220前端的照明光路210，通过照明光路210后，使照明光束符合DMD220所要求的照明尺寸和入射角度。DMD220表面包括成千上万个微小反射镜，每个小反射镜可单独受驱动进行偏转，比如可进行正负12度或者正负17度的偏转。其中，负的偏转角度反射出的光，称之为OFF光，OFF光为无效光，通常打到壳体上或者设置吸光设备吸收掉。正的偏转角度反射出的光，称之为ON光，ON光是DMD光阀表面的微小反射镜接收照明光束照射，并通过正的偏转角度射入镜头300的有效光束，用于投影成像。
在本示例中，光机200应用DLP投影架构，并且使用DMD反射式光阀作为光调制器件。
参见图1A，镜头300通过光机200的第三出光口202与光机200实现连接，例如，通过各自对应的外壳(镜头外壳和光机外壳)的端面通过螺钉锁固，而且，在一些示例中，镜头300的部分镜片组还伸入光机200的第三光出口202中。
镜头300包括多片透镜组合，通常按照群组进行划分，分为前群、中群和后群三段式，或者前群和后群两段式。前群是靠近投影设备出光侧的镜片群组，后群是靠近光调制器件出光侧的镜片群组。根据上述多种镜片组组合，镜头300也可以是变焦镜头，或者为定焦可调焦镜头，或者为定焦镜头。
在一些实施例中，激光投影设备为超短焦投影设备，镜头300为超短焦投影镜头，镜头300的投射比通常小于0.3，比如0.24。超短焦投影镜头可如图3A所示例的一种，包括折射透镜组310和反射镜组320，反射镜组320可以为曲面反射镜，如图3B所示，投影光束经镜头300后呈斜向上出射到投影屏幕400上成像，这有别于传统的长焦投影中投影光束光轴位于投影画面中垂线的出光方式，超短焦投影镜头相对于投影画面通常具有120％～150％的偏移量。
由于DMD芯片的尺寸很小，比如有0.66英寸，0.65英寸，或者0.47英寸，而投影画面尺寸通常在70英寸以上，比如在80英寸和150英寸之间，因此对于镜头300来说，既要实现上百倍的放大，还要校正像差，具有良好的解析度，从而呈现高清晰度的投影画面，超短焦投影镜头的设计难度要远大于长焦投影镜头。
在超短焦投影设备中，DMD光阀出光面的中心垂线通常与镜头的光轴平行，但不重合，即DMD偏置于镜头300设置，这使得从DMD出光面出射的光束呈一定角度斜入射至镜头300中，经过多片镜片的部分区域的透射，以及反射，最终投影光束斜向上从镜头部300中出射。
DMD光阀作为光调制器件，是受电信号驱动对光进行调制，使得光束携带有图像信息，最终经镜头放大形成投影图像。
在DMD光阀本身相对固定分辨率的基础上，为了实现更高清晰度和分辨率的图像画面，如图3A所示，还可在光调制器件(例如DMD光阀) 至镜头的光路中设置振镜230，振镜230为一个透射型平片结构。通过一维振动，振镜230将相继对透射通过的子图像光束进行角度位移，从而相邻的两幅子图像会进行错位叠加后成像在投影屏幕上，利用人眼视觉暂留效果，两幅子图像的信息叠加成为一幅图像信息，人眼感知到的图像细节增加，图像的分辨率也得以提升。
振镜230还可以做二维运动，比如在上下左右四个位置进行移动，从而可以将四幅子图像错位叠加在一起，利用上述信息量叠加的原理，实现人眼感知到的分辨率提升效果。上述无论是两幅子图像叠加，还是四幅子图像叠加，这两幅子图像或四幅子图像都需要事先通过一幅高分辨率的图像进行分解得到，且分解的方式需要与振镜230的运动方式相配合，才能正确叠加而不发生图像的混乱。
振镜230通常设置于DMD光阀和镜头之间，本示例中，DMD光阀和镜头之间传递的光束可近似看做平行光束，平行光束在经过呈平片状的振镜230折射后仍能保持较好的平行度。此处值得说明的是，如果发散角度较大的光束在通过呈平片状的振镜230折射后，折射后的角度变化较大，可能导致相继通过振镜的两幅子图像光束叠加时出现亮度或色度的不均匀。
参见图1A，光机200、镜头300和另一部分整机壳体101围合的空间内(即第二区域M 2)设置有多个电路板500，多个电路板500包括电源板，TV(television，电视)板，控制板，显示板等。上述多个电路板500通常层叠设置，例如，多个电路板500也可以一部分沿着垂直于整机壳体101的底壁的方向层叠放置，另一部分沿平行于整机壳体的底壁的方向(例如第一方向X)层叠设置。
在激光投影设备10中，沿整机壳体101内侧，还设置有音响，风扇，散热装置等结构。
上述一些实施例提供的激光投影设备，光机200和镜头300沿着设备整机壳体101第一方向X设置，将整机隔成两个部分，这两个部分分别如图1A所示的左右两部分(即第一区域M 1和第二区域M 2)，其中一部分(比如第一区域M 1)可容纳光源，另一部分(比如第二区域M 2)可容纳多个电路板。这样的划分可视为将光学区域和电学区域分开。需要说明 的是，光学区域中也通常设置有驱动电路，但是由于相比于显示板，信号板，电源板等电路部分体积较小，复杂度也较低，因此可以认为左半部分主体(即第一区域M 1)为光学区域，右半部分主体(即第一区域M 2)为电学区域。这样将不同的主体分开设置，既便于整机的组装和调试，同时也便于光学部分和电路部分各自的设计需求，比如散热，走线，电磁测试等。
在本示例提供的激光投影设备中，光机200和镜头300同向设置，镜头300的部分镜片组伸入光机200内部，利于减小光机和镜头这两部分组装后的体积。按照反射式光阀的出光特点，虽然受制于不同照明光路架构，光源100的光束可能会经过多次转折最终入射镜头300，但光源100的第一光出口103出射的光束方向，与镜头300的入光面的光束方向相比，可认为光源100出射光束的光轴方向与镜头300入射光束的光轴方向在空间位置上具有垂直关系。光源100、光机200和镜头300连接组装后呈现L型，为光束光轴的转折提供了结构上的基础，降低了光束从光机200入射至镜头300的光路的设计难度。而且上述激光投影设备整机布局较为紧凑，光路架构也更为简洁。
在本示例中，光源100用于为光机200提供光源照明，示例性地，光源100通过时序性地输出三基色照明光束为光机200提供照明光束。
需要说明的是，光源100也可以为非时序性输出，存在不同基色的照明光束叠加输出的时段。比如存在红色照明光束和绿色照明光束叠加输出时段，从而增加了光束周期中黄色照明光束的比例，有利于提升图像亮度；或者红色照明光束，绿色照明光束，蓝色照明光束同时在一部分时段点亮，三色照明光束叠加形成白色照明光束，可以提升白场亮度。因此，在光机200包括三片式LCD液晶光阀的情况下，为配合三片式LCD液晶光阀，光源100中的三色基色光可同时点亮输出混合白光。
而在本示例中，光源100虽然时序性的输出三色基色光，根据三色混光原理，人眼是分辨不到某一时刻光的颜色的，感知到的仍然是混合的白光。因此光源100的输出通常也称之为混合白光。
图5A为图1A中光源100的局部结构示意图，图5B为图5A的分 解结构示意图。下面将结合附图对三色激光光源示例进行说明。
如图5A所示，光源100包括光源壳体102，以及安装于光源壳体102不同侧壁上的红色激光器组件110、蓝色激光器组件120和绿色激光器组件130，红色激光器组件110可以发出红色激光、蓝色激光器组件120可以发出蓝色激光，绿色激光器组件130可以发出绿色激光。其中，蓝色激光器组件120和绿色激光器组件130并列安装于同一个侧壁上，并均与红色激光器组件110在空间位置上垂直，也即，蓝色激光器组件120和绿色激光器组件130所在的光源壳体的侧壁(即第二侧壁)，与红色激光器组件130所在的光源壳体的侧壁(即第一侧壁)垂直，且这两个侧壁均垂直于光源壳体102的底壁或者整机壳体101的底壁。此时，绿色激光器组件和蓝色激光器组件位于第二平面上，且绿色激光器组件在第二平面上与蓝色激光器组件并列设置；红色激光器组件位于与第二平面垂直的第一平面上，以使红色激光器组件垂直于绿色激光器组件及蓝色激光器组件。
图5G为光源100的一种光路原理示意图。如图5G所示，第一激光器组件为红色激光器组件110，第一激光为红色激光；第二激光器组件为蓝色激光器组件120，第二激光为蓝色激光；第三激光器组件为绿色激光器组件130，第三激光为绿色激光。其中，蓝色激光器组件120和绿色激光器组件130并列排列，蓝色激光器组件120比绿色激光器组件更靠近红色激光器组件110设置。红色激光器组件110的出光面面向光源的出光口，即红色激光器组件110发出的光束可经过一次透射直接输出至光源100出光口，不需要进行光路转折。
绿色激光器组件130发出的光束经过三次反射从出光口出射，蓝色激光器组件120发出的光束经过一次透射和一次反射从出光口出射。可见，上述光路原理示意图中，红色激光经过的光路径最短，绿色激光经过的光路径最长，而且绿色激光经过的反射次数最多。
在一些实施例中，参见图5A、5B，上述三个颜色的激光器组件分别输出矩形光斑，各颜色激光器组件安装于光源壳体的侧壁后，其对应输出的矩形光斑的长边垂直于光源壳体的底壁。这样，三个颜色的激光器组件输出的激光光斑在合光时不会形成“十”字型光斑，利于合光光斑尺寸的减小和较高的匀化度。此处，需要说明的是，在三个颜色的激光器组件时序 性地输出红色激光、绿色激光和蓝色激光的情况下，此处的“合光”和“合光光斑”指的是人眼感知到的混合白光的效果。
如图5A和图5B所示，光源壳体102包括顶盖和底壁，以及位于顶盖和底壁之间的多个侧壁，第一出光口103位于其中一个侧壁上。光源100还包括多个光学镜片，所述多个光学镜片都设置在光源壳体102的底壁上。光源壳体102的顶盖为翅片状，可以增加散热面积。在光源壳体102的侧壁上开设有多个窗口1021，以便安装上述多个激光器组件，使上述任一颜色的激光器组件发出的光束可以从对应的窗口中入射至光源壳体102内部，然后通过多个光学镜片形成光传输路径。例如，光源壳体102的第一侧壁上设置有与红色激光器组件110对应的第一窗口，光源壳体102的第二侧壁上设置有与蓝色激光器组件120对应的第二窗口，以及与绿色激光器组件130对应的第三窗口。
在本示例中，光源壳体102的顶盖上还安装有一些控制电路板，并且，如图5I所示的光源壳体底壁角度的结构示意图，在底壁上还预留有光学镜片的调节结构安装位1023。
在一些实施例中，参见图5I，光源100还包括气压平衡装置1022，气压平衡装置1022设置于光源壳体102的底壁或顶盖上。气压平衡装置可以泄压，在光源壳体的内部温升过高的情况下，通过气压平衡装置向光源壳体的外部泄压、或者通过气压平衡装置形成气体容纳空间以增大光源的内部密封空间的体积，这样可以对光源壳体内的气压进行平衡，提高光源壳体内各光学器件工作的可靠性。
在一些示例中，气压平衡装置1022为过滤阀，过滤阀被配置为连通光源壳体102的内部与外部，实现气流的交换，即，当光源壳体102的内部温度升高时，内部气流向外部流出，当温度降低使光源壳体102的内部恢复冷却后，外部气流也可进入光源壳体102的内部。示例性地，过滤阀设置为气密防水过滤膜，能够对外界一定直径范围内的灰尘、粉尘进行过滤，将其阻挡在外，保持光源壳体内部的洁净度。
在另一些示例中，气压平衡装置1022为可伸缩气囊，气囊可以由弹性橡胶制成，气囊配置为在光源壳体102的内部气压增大期间体积增大， 以缓解光源壳体102的内部气压。
由于三种颜色的激光器组件与光源壳体的组装结构基本相同，因此为了简便说明各激光器组件与光源壳体的连接关系，下面将以其中任一种颜色激光器组件的组装结构为例进行说明。
上述三种颜色的激光器组件均为MCL(Multi-Chip Laser diode，多芯片激光二极管)型激光器组件，MCL型激光器组件包括MCL激光器和设置于MCL激光器外周侧的激光器驱动电路板。MCL激光器将多颗发光芯片封装在一块基板上，形成面光源输出。如图5F-1所示的一种MCL激光器110A，包括金属基板1102，金属基板1102上封装有多颗发光芯片，多颗发光芯片可以串联，也可以按照行或者列并联进行驱动。多颗发光芯片可以按照4×6阵列排列，也可以是其他阵列排列方式，比如3×5阵列，或者2×7阵列，或者2×6阵列，或者4×5阵列，不同阵列数目的激光器的整体发光功率不同。金属基板1102的两侧伸出引脚1103，通过将这些引脚进行电信号连接，可以驱动发光芯片发光。MCL激光器110A还包括覆盖于所述多颗发光芯片的发光面上的准直透镜组1101，准直透镜组1101通常通过胶粘固定。准直透镜组1101包括多颗准直透镜，通常会一一对应发光芯片的发光位置，对激光光束进行对应的准直。
如图5F-2所示，MCL型激光器组件还包括设置在MCL激光器外周侧的激光器驱动电路板1104。激光器驱动电路板1104为平板结构，激光器驱动电路板与MCL激光器的出光面大致平行或者位于同一平面内。MCL激光器的两侧分别具有至少一个引脚1103，各引脚1103分别焊接或者插接在激光器驱动电路板1104上，以使MCL激光器与激光器驱动电路板电连接。激光器驱动电路板1104被配置为向MCL激光器提供驱动信号。在一些示例中，激光器驱动电路板一体成型，围绕在MCL激光器的基板1102的外侧。在另一些示例中，激光器驱动电路板为两个独立的电路板，即激光器驱动电路板包括第一部分1104a和第二部分1104b，两者将MCL激光器围合起来，这样封装后的激光器组件也基本呈一平板结构，便于安装，且节省空间，也利于光源设备实现小型化。
图5C-1和图5D分别为任一颜色激光器组件与固定支架的组装结构示意图，以及分解结构示意图。图5C-1显示了从正面观察时的示意图(右 图)和从背面观察时的示意图(左图)。
参见图5B，激光光源100还包括固定支架104，任一颜色激光器组件通过固定支架104安装于对应的光源壳体的窗口1021处，固定支架104与光源壳体102通过螺钉锁固，从而将激光器组件固定在窗口1021位置处。例如，图5B中，红色激光器组件110通过第一固定支架安装于光源壳体的第一窗口处，蓝色激光器组件120通过第二固定支架安装于光源壳体的第二窗口处，绿色激光器组件120通过第三固定支架安装于光源壳体的第三窗口处。
在任一颜色的激光器组件为上述MCL型激光器组件的情况下，MCL型激光器组件中的MCL激光器的金属基板上设置有装配孔，可以与对应的固定支架进行锁固。
如图5D所示，固定支架104为具有透光窗框1041的钣金件，透光窗框1401的正面靠近光源壳体102的窗口1021安装，而任一颜色的激光器组件则安装在透光窗框1041的背面的安装位上。并且，为了提高安装结构的密封性，在该透光窗框1041的背面安装位处设置有第三密封件1042，第三密封件1042是具有折边的框型橡胶件，可以套设在MCL型激光器组件的正面，再将MCL型激光器组件固定于安装位处。第三密封件1042还能够起到缓冲作用，防止MCL型激光器组件的准直透镜组由于与钣金件的硬接触而损伤。
MCL型激光器组件由MCL激光器110A和对应的激光器驱动电路板1104组成。MCL型激光器组件固定至固定支架104上后成为一个组装单位，一起安装到光源壳体102对应的窗口1021位置处。示例地，窗口1021周围具有螺柱，通过螺丝穿过固定支架的螺柱打进窗口周围的螺柱上。
由于光源100内部设置有多个光学镜片，多个光学镜片均为精密部件，且光源100内部光束传输过程中的能量密度非常高；因此如果内部环境洁净度不高，粉尘、灰尘等颗粒会在精密的多个光学镜片表面聚积，造成光处理效率下降，进而造成光路的光衰等不良后果，而且整个激光投影设备的整机亮度也会随之下降。对光源内部进行防尘可以减轻上述光衰问题，示例性地，参见图5B和图5E-1，在光源壳体102的窗口1021处还设 置有密封玻璃105，密封玻璃105将光源壳体的内部与窗口1021处安装的激光器组件进行隔离，可以使外部灰尘等不会从窗口1021处进入光源壳体102的内部。密封玻璃105可以设置在光源壳体102的内表面上，比如通过粘接；也可以设置在光源壳体102靠近激光器组件的一侧，比如通过在光源壳体102的外表面设置开设安装位，依次将激光器组件，密封玻璃均安装在光源壳体的窗口的外侧。
如图5E-1所示的分解结构，为了上述密封玻璃安装的便利性，本示例中，密封玻璃105安装在窗口1021靠近激光器组件一侧。在固定支架104正面还具有第一容纳槽，用于容纳第一密封件1051；光源壳体的窗口1021处具有第二容纳槽，用于容纳第二密封件1052。密封玻璃105位于第一密封件1051和第二密封件1052之间，示例性地，将第二密封件1052放置于窗口1021处的第二容纳槽中；第二密封件1052中设置有与密封玻璃105的相配合固定槽位，将密封玻璃105放置于该固定槽位中；以及将第一密封件1051通过过盈配合安装到固定支架的透光窗框1041的第一容纳槽中；再将固定支架和MCL激光器组成的激光器组件安装至光源壳体的窗口1021处；第一密封件1051与密封玻璃105产生挤压接触，伴随着激光器组件的固定完成，密封玻璃105也被夹在第一密封件1051和第二密封件1052之间进行固定。
上述一些示例中，任一颜色的MCL型激光器组件通过轴肩螺钉固定到固定支架上，且轴肩螺钉和固定支架之间还设置有减震件，可以降低激光器在以较高频率驱动过程中产生的噪音传递。
以上对激光器组件与光源壳体的组装结构进行了说明。上述激光器组件安装到了光源壳体上，在驱动信号控制下发出激光光束，在内部形成光路输出，配合光机，镜头来进行投影成像。
在激光投影设备中，光源是主要的发热源，激光器的高密度能量光束照射到光学镜片表面也会产生热量。DMD芯片为零点几个英寸的面积，但是却需要承受整个投影图像所需的光束能量，其发热量也非常高。一方面，激光器具有设定的工作温度以形成稳定的光输出，从而兼顾使用寿命和性能。此外，激光投影设备内部还包含多个精密光学镜片，尤其是超短焦镜头包含多个镜片，如果整个设备内部温度过高，热量聚集，会造成镜 头内镜片发生“温飘”现象，激光投影设备的成像质量会严重下降。以及，电路板上的电子器件等受电信号驱动，也会产生一定的热量，并且各个电子器件也具有设定的工作温度。因此，良好的散热和温度控制对于激光投影设备正常工作是非常重要的保证。
参见图1A和图1B所示的激光投影设备结构示意图，在光机200和镜头300以及部分整机壳体101围合的空间(即第一区域M 1)内，沿着由光机指向镜头的方向，依次设置有光源100和第二散热装置，也即第二散热装置沿第一方向X与光源100并排设置。其中，光源100靠近整机壳体的一侧边设置；第二散热装置沿着第一方向X靠近整机壳体101的另一侧边设置，上述两侧边相对。示例地，在图6A-1和图6A-2所示的光源散热系统示意图中，第二散热装置包括散热翅片601和热管602，散热翅片601与光源壳体上安装的蓝色激光器组件120和绿色激光器组件130的侧壁相对设置。蓝色激光器组件120和绿色激光器组件130通过热管602将热量传导至散热翅片601处。
如图6D和图6E所示，第二散热装置还包括导热块603。导热块603与蓝色激光器组件120和绿色激光器组件130通过热沉接触导热。热管602的热端与导热块接触实现热传递；热管602的冷端与散热翅片601接触；热管602为一个内部具有液体的封闭管道，通过液体气液变化来实现热量的传导。热管冷端接触的散热翅片通常通过风冷降温，使得热管冷端也被降温，气体液化回流至热管热端。示例地，散热翅片601和热管602的数量均为多个，多个热管602平行设置，多个散热翅片601均套装在平行设置的多个热管602上。
如图6A-1、图6A-2和图6C所示，激光投影设备还包括第一散热装置，第一散热装置位于光源和第二散热装置的远离光机及镜头一侧。第一散热装置包括冷头610、冷排611和管道614。其中，冷头610和与光源100的第一出光口103相对的光源壳体102的侧壁相接触。在本示例中，与光源100的第一出光口103相对的光源壳体的侧壁上安装有红色激光器组件110，红色激光器组件110与冷头610接触；冷排611远离所述红色激光器组件110，例如冷排611设置于第二散热装置的远离镜头的一侧；管道连接冷头610和冷排611，以便使冷却介质在冷头610和冷排611间 循环，从而使红色激光器组件110可以通过液冷方式进行散热。示例地，冷排611处的冷却介质可以被风扇冷却，冷却后的冷却介质，比如，常用的为水，再次流回至冷头610，依次循环，对热源(比如红色激光器组件110)进行热量的传导。第一散热装置还包括泵，泵配置为驱动管道中的冷却介质保持流动，在本示例中，将泵与冷头一体化设置，利于减少部件体积，下文提到的冷头可以是指冷头和泵的一体化结构。
在本示例的激光投影设备中，还包括补液器，补液器配置为对第一散热装置进行补液，使得整个第一散热装置内的液体压力大于系统外界压力，这样外部气体不会因为冷却介质的挥发或管道接头密封性不好而进入循环系统内部，造成循环系统内部噪音，甚至产生气蚀现象对器件造成损坏。
上述第一散热装置相比于第二散热装置较为灵活的是，冷头610和冷排611的体积相对于传统散热翅片的体积较小，在自身形状和结构位置的选择上更为多样。由于冷头610和冷排611通过管道连通，始终为一个循环系统，因此冷排611可以靠近冷头610设置，也可以与冷头610有其他相对位置关系，这由激光投影设备的空间决定。
在本示例中，如图6B所示，冷排611和补液器612均靠近整机壳体侧边排列，冷排611相比于补液器612和冷头610的体积都大，因此补液器612、冷头610设置在一处，冷排611与两者并列排列在整机壳体内侧。
如图1B所示，光机200、镜头300与另一部分整机壳体围合的空间内还设置有多个电路板500和第二风扇605，第二风扇605靠近整机壳体101设置(即第二风扇605位于多个电路板500的远离光机200和镜头300的一侧)；第二风扇的数量可以为一个或多个。
根据气流流向，本示例的激光投影设备具有两条主要散热路径，路径a和路径b。其中，光机核心部件DMD芯片的热量沿着路径a传导出；光源100的热量可以同时沿着路径a和路径b传导出，而且沿着路径b传导出的热量较多。
在上述激光投影设备中，光源100设置于整个设备的左侧，光机200 和镜头300位于设备的中部，电路板设置于设备的右侧。气流沿着路径a和路径b均是从左向右流动，路径a和路径b的主路径基本呈平行状态。
在激光投影设备中，光源100为激光光源，所包括的不同颜色的激光器组件具有不同的工作温度要求。其中，红色激光器组件的工作温度小于50℃，蓝色激光器组件和绿色激光器组件的工作温度小于65℃。光机中DMD芯片的工作温度通常控制在70℃左右，镜头部分的温度通常控制在85℃以下。而对于电路板部分，不同的电子器件的温控不同，通常在80℃～120℃之间。可见，由于设备中光学部分和电路部分对于温度的耐受值不同，光学部分的工作温度耐受值普遍低于电路部分，因此气流从光学部分吹向电路部分，可以使两部分都达到散热目的且维持自身的正常工作。
对于路径a，如图6B所示，位于设备上半部分。路径a的气流主要将光机200中光阀的热量带走，并流经部分电路板500，经第二风扇605排出壳体外。此外，光阀(DMD芯片)可以通过散热器240散热，散热器240通过第四风扇607进行风冷散热，使气流沿着路径a流经部分电路板，第二风扇605为吸风风扇，与第四风扇607形成的气流流向相同，能够使第四风扇607形成的气流在流经散热器，多个电路板后仍具有较高流速，能够顺利将热气流排出整机壳体外。
对于路径b，如图1B所示，位于设备下半部分。在图1B所示的激光投影设备中，冷排611和散热翅片601依次沿着路径b方向排列，散热翅片601一侧为冷排611，另一侧为镜头300。为了及时将冷排611和散热翅片601的热量散出，在冷排611和散热翅片601之间设置有第一风扇604，第一风扇604对于冷排611而言是吸风风扇，对于散热翅片601而言是吹风风扇，该第一风扇604将冷排611的热量吸走形成第一气流，吹向散热翅片601，散热翅片601具有多组平行的风道，第一气流穿过这些散热翅片表面和内部风道后形成第二气流，第二气流再吹向镜头300，第二气流可以沿着镜头300壳体周围和镜头300壳体底部空间流过，带走镜头壳体表面的热量。
需要说明的是，由于红色激光器组件的工作温度小于50℃，比如当控制为45℃以下时，使用液冷散热方式，冷排的表面温度和冷头的表面温度差控制在1～2℃范围内，即若冷头的表面温度为45℃，则冷排的表面温 度为43℃～44℃，其中，冷头的表面温度是指冷头与激光器组件热沉的接触面的温度。示例地，第一风扇将环境温度的风吸进来，环境温度通常在20～25℃，对冷排进行风冷散热，将冷排的表面温度降至43℃。而蓝色激光器组件和绿色激光器组件的工作温度在65℃以下，散热翅片的温度则需要在62℃～63℃，散热翅片的温度与激光器组件热沉的温度差在2～3℃范围内。可见，冷排的温度低于散热翅片的温度，因此，冷排设置于散热路径的前端，在散热路径中也位于散热翅片之前。风扇转动形成的气流对冷排进行散热后再次吹向散热翅片，仍然可以对散热翅片进行散热。
同理，由于镜头的工作温度控制在85℃，散热翅片的温度在63℃，仍然低于镜头的工作温度，因此流经散热翅片后的第二气流相对于镜头而言仍然是冷风气流，可以利用散热。而电路板的工作温度普遍高于镜头的工作控制温度，因此，对镜头进行散热后的气流相对于大部分电路板而言也仍然是冷风气流，仍然可以继续流经多个电路板进行散热。
在路径b中，由于需要散热的热源部件较多，气流流动的阻力也较大，为了增强流速，使得该路径中的热气流快速散出整体壳体外，在电路板的气流流出侧，靠近整机壳体处还设置有第二风扇605，此时，第二风扇605的数量为多个，一部分第二风扇605配置为形成散热路径a；另一部分第二风扇605和第一风扇604共同驱动气流依次流经冷排611、散热翅片601、镜头300和至少部分电路板500，形成散热路径b。
需要说明的是，第一风扇也可以设置在冷排前端，即第一风扇可以设置在整机壳体和冷排之间。此时第一风扇相对于冷排而言为吹风风扇，此时，第一风扇吹出的风先吹向冷排，再吹向散热翅片。
气流流动起来才能够带走热量，为了增加散热气流的流速，如图6A-2所示，在散热翅片和镜头之间还可以设置第三风扇606，第三风扇606对于散热翅片601而言是吸风风扇，对于镜头300而言是吹风风扇，这样相当于对第二气流进行了加速，增强了流速，携带热量的能力也增强，并配合第二风扇605的吸风，第三风扇606将第二气流吹向电路板，并经第二风扇605排出壳体外。
在上述散热路径a或散热路径b中，气流基本呈线型流动，很少具有迂回和转折，这能够减小气流流动的阻力，便于气流携带热量后迅速以较快的流速流走，便于对热源部件的散热。
在本示例中，冷排，散热翅片，镜头，电路板具有逐渐升高的工作温 度阈值，上述结构布局方式也利于设计散热路径，散热气流可以从工作温度阈值较低的部件流向工作温度阈值较高的部件，在一个散热路径中可以依次为多个热源部件散热，既能满足多个热源部件的工作散热需求，同时整机散热效率高。
此外，需要说明的是，冷排也可以设置于散热路径a中，即与DMD芯片位于同一条散热路径中。为了增强传热系数，可以通过在散热翅片表面进行结构改进，实现增大散热面积，或者实现增大风的流速，以此来增加散热能力。
在上述一些实施例提供的激光投影设备中，红色激光器组件的发光功率范围可以为24W～56W，蓝色激光器组件的发光功率范围可以为48W～115W，绿色激光器组件的发光功率范围可以为12W～28W。例如，红色激光器组件的发光功率为48W，蓝色激光器组件的发光功率为82W，绿色激光器组件的发光功率为24W。上述三色的激光器均采用MCL型激光器组件。与BANK型激光器组件相比，在输出相同的发光功率下，MCL型激光器组件的体积大大减小。
通过上述说明，在激光投影设备中，光源100的散热要求最为严格，是整个设备中工作温度控制相对较低的部分。而且红色激光器组件的工作温度要低于蓝色激光器组件和绿色激光器组件的工作温度，这是由于红色激光的发光原理决定的。蓝色激光和绿色激光是利用砷化镓发光材料产生的，红色激光是利用氮化镓发光材料产生的。红色激光的发光效率低，且发热量较高。红色激光发光材料对温度的要求也更为严苛。因此，在对由三色激光器组成的光源部件进行散热时，还需要根据不同激光器组件的温度要求设置不同的散热结构，可以保证每种颜色的激光器工作在较佳的状态，提高激光器组件的使用寿命，其发光效率也更加稳定。
风冷散热方式可以将热源热端和冷端的温差控制在3℃左右，而液冷散热的温差控制可以更为精确和范围更小，比如在1～2℃。对于工作温度阈值更低的红色激光器组件采用液冷散热(即利用第一散热装置)的方式，而对工作温度阈值相对较高的蓝色激光器组件和绿色激光器组件采用风冷散热(即利用第二散热装置)的方式，可以在满足红色激光器工作温度需求下，以较低的散热成本对其进行散热，满足较小的温差控制即可，这样对风扇的转速要求可以降低。但液冷散热方式的部件成本相比于风冷散热更高。
因此，在本示例中的激光投影设备中，对光源散热采用液冷和风冷混 合散热的方式，能够满足不同激光器组件工作温度控制的同时，经济合理。
在一些实施例中，参见图6C，红色激光器组件110背面的金属基板与冷头通过第一导热块613连接，第一导热块613的面积大于冷头导热面的面积，第一导热块613的面积也大于红色激光器组件110背面热沉导热面的面积。这样利于将激光器组件热沉的热量快速的集中起来传递给冷头，提高热传导效率。
在图6C所示的散热系统结构中，冷头610的出口通过管道连接冷排611的进口，冷排611的出口通过管道连接冷头610的进口。在冷头610和冷排611以及管道构成的第一散热装置中，还设置有补液器612，如前所述，补液器612用于为系统循环补充冷却液，因此补液器可以设置整个循环系统的多个位置，根据系统结构空间等因素，补液器可以为一个或多个，可以与泵连接在一起，也可以靠近冷排设置。
在本示例中，蓝色激光器组件和绿色激光器组件的工作温度控制相同，共用一个散热翅片结构。例如，如图6D和6E所示，蓝色激光器组件120，绿色激光器组件130背面的热沉通过导热块603与热管602接触，热管602伸入散热翅片601内部。对应不同颜色的激光器组件，比如，对应蓝色激光器组件，为便于区分，导热块603为第二导热块，对应绿色激光器组件，导热块603为第三导热块。第二导热块和第三导热块可以为独立的两个部件，分别为不同的激光器组件进行热传导，也可以为一整个结构，这样便于安装，且两种颜色的激光器组件散热需求相同时，也便于控制温度。
在一些示例中，上述热管的数量为多个，对应蓝色和绿色激光器组件的热管数量相同。在本示例中，热管为直型热管，热管为多根，散热翅片601内部开设多个通孔，用于插入多根热管。散热翅片601靠近蓝色和绿色激光器组件设置，多根热管可以不进行弯折，直接插入散热翅片601中，直型热管利于热管内部气液变化中传输阻力的降低，利于提高热传导效率。
通过上述组合散热结构，对光源部件可以进行散热，从而保证三色激光光源部件的正常工作。光源发出三色激光，提供高质量的照明光束，投射形成亮度高，色彩佳的投影图像。由于三色激光器组件排布在不同的空间位置上，在光源内腔体还需要多个光学镜片来对不同方向的激光光束进行合光，以及匀化等光处理。
在本一些实施例提供的激光投影设备中，如图5G所示的光源光路原理 示意图中，绿色激光器组件130发出的绿色激光由第一合光镜106反射后入射至第二合光镜107，蓝色激光器组件120发出的蓝色激光透射通过第二合光镜107，以及绿色激光被第二合光镜107反射输出，通过第二合光镜107可以将蓝色激光和绿色激光进行合路输出。
经第二合光镜107合路输出的蓝色激光和绿色激光的输出方向与红色激光器组件110发出的红色激光的输出方向垂直，且具有交汇，在三束光束的交汇处设置有第三合光镜108，第三合光镜108透射红色激光，反射绿色激光和蓝色激光。经第三合光镜108后，三色激光光束完成合束，形成一路光束入射至匀化元件109，并经会聚镜组111缩小光斑后从光源出光口出射。
如图5B所示的光源结构图示中，蓝色激光器组件120和绿色激光器组件130并列安装在光源壳体的一个侧壁上，红色激光器组件110安装在光源壳体102的另一个侧壁上，这两个光源壳体的侧壁呈垂直关系。三种颜色的激光器组件分别输出矩形光斑，各激光器组件安装于光源壳体的侧壁后，其对应输出的矩形光斑的长边垂直于光源壳体的底壁。
在光源壳体的内部，还设置有多片合光镜，以及会聚镜组。其中，第一合光镜106朝向绿色激光器组件130的发光面倾斜设置，反射绿色激光至第二合光镜107。第二合光镜107朝向蓝色激光器组件120的发光面倾斜设置，透射蓝色激光并反射绿色激光至第三合光镜108。上述第一合光镜106和第二合光镜107大致呈平行排列，与对应激光器组件发光面呈45度设置。其中第一合光镜106，第二合光镜107通过基座夹持固定在光源壳体102的底壁上，并且考虑到组装公差的原因，第一合光镜106、第二合光镜107的角度还可以微调，比如在正负3度以内。
第三合光镜108朝向红色激光器组件110的发光面倾斜设置，此处第三合光镜108的倾斜角度与红色激光光轴方向大致呈135度倾斜(也即第三合光镜108与第二合光镜107大致垂直)，第三合光镜108透射红色激光并反射蓝色、绿色激光，将三色激光合束输出至会聚镜组111。第三合光镜108靠近会聚镜组111设置。同样地，第三合光镜108也通过基座夹持固定在光源壳体102的底面上，并且设置为安装角度可以在3度范围内微调。
示例地，第一合光镜为反射镜，第二合光镜，第三合光镜均为二向色片。
第二合光镜和第三合光镜的光反射率均大于其光透射率，比如，两合光镜的光反射率可达到99％，透射率通常在95％～97％。
本示例提供的三色激光器组件均为MCL型激光器组件，如图5F-1所示，MCL型激光器组件的MCL激光器包括封装于一块金属基板上的多颗发光芯片，由于发光原理的不同，不同颜色的发光芯片的发光功率也不同，比如绿色芯片的发光功率在每颗芯片1W左右，而蓝色芯片的发光功率在每颗4W以上。当上述三色激光器采用同样颗数的芯片排布时，比如均使用4×6排列的封装类型，在整体发光功率上也不同，比如，绿色激光器组件的发光功率小于红色激光器组件的发光功率，也小于蓝色激光器组件的发光功率，红色激光器组件的发光功率小于蓝色激光器组件的发光功率。
在上述示例中，红色激光器组件和蓝色激光器组件以及绿色激光器组件的采用相同阵列的发光芯片封装，比如均为4×6阵列。但是由于红色发光芯片的发光原理的不同，如图7所示，在一个红色发光芯片处会存在两个发光点(X1和X2)，这使得红色激光在快轴方向和慢轴方向的发散角度相比于蓝色激光和绿色激光的要大，在光路传输过程中，对于经过相同的光学镜片，红色激光由于发散角度大，光学镜片具有一定的收光范围或者在一定角度范围具有较佳的光处理性能，从而红色激光经过的光路径或光程越长，其发散程度更严重，导致后面光学镜片对红色激光的光处理效率就会越低。虽然红色激光器组件的发光功率大于绿色激光器的发光功率，但是在经过相同长度的光路径后，红色激光的光损率要大于绿色激光和蓝色激光的光损率。光损排名：红＞绿＞蓝；功率排名：绿＜红＜蓝。
如图5B所示的光源结构中，红色激光器组件110的发光面面向光源的第一出光口103，红色激光沿红色激光器组件发光面输出后，经过一次透射，并经过匀化元件109和会聚镜组111后从第一出光口103出射。而对于蓝色激光，会先经过一次透射，再经过一次反射后入射匀化元件109和会聚镜组111并从第一出光口103出射；绿色激光则经过了三次反射后入射匀化元件109和会聚镜组111并从第一出光口103出射。可见，在从光源第一出光口输出之前，红色激光的光路径均短于蓝色激光和绿色激光的光路径，这样，红色激光在光路径传输过程中产生的光损可以减小。以及，在不考虑光路径对光损影响下，红色激光经过第三合光镜的透射后，光能约可达到97％*1＝97％，需要说明的是，此处对于红色激光的光能效率的计算是不考虑红色激光发散角度大，存在大角度光损的情况下的，仅单纯考虑光学镜片透反率的影响。
而绿色激光经过三次反射，在仅考虑透反率对光损影响时，绿色激光从第三合光镜输出的光能约可达到99％*99％*99％＝97％，蓝色激光经过一次 透射和一次反射，从第三合光镜输出的光能约可达到99％*97*＝96％，而蓝色激光的光路径相比于绿色激光要短一些，因此从光学元件对光的透反率损耗，以及光路径长短对光的损耗综合来看，蓝色激光和绿色激光在从第三合光镜输出后光损率基本上视为一致，也均与红色激光在此位置处的光损率相当。从而基于上述的各色激光器组件的布局，在各色激光器不同的光学特性下，可以较好地平衡各色激光光束在传输过程中的损耗，使得三色激光的功率配比接近预设值，不会发生明显的失衡，也有利于实现符合理论设计的颜色配比和期望的白平衡。而当三色激光从第三合光镜合束输出后，三者所经历的光路径相同，则容易达到一致的光损。
上述三种颜色的激光器组件的排列，也有利于针对红色激光器组件、蓝色激光器组件和绿色激光器组件不同的散热需求进行散热。红色激光器组件对温度较为敏感，工作温度通常控制在50℃以下，蓝色激光器组件和绿色激光器组件的工作温度高于红色激光器组件，且具有较为明显的温度差，通常控制在65℃以下，这样，对于相同温控要求的蓝色激光器组件和绿色激光器组件，通过排列在一起也有利于共用散热结构进行散热。而红色激光器组件单独设置在光源壳体的其他位置，且与蓝色激光器组件和绿色激光器组件隔开一定距离，可以减轻蓝色激光器组件和绿色激光器组件作为高温度热源向作为低温度热源的红色激光器组件的热量辐射，减轻红色激光器组件的热量负担。
上述激光器组件均采用MCL型激光器组件，相比于传统的BANK型激光器组件，MCL型激光器组件的体积明显较小，因此本实施例中，如图1A和图5B所示的激光投影设备的光源，其结构体积比传统使用BANK型激光器组件时要明显减小，使得光源附近可以预留出较多的空间，为散热设计提供了便利，比如散热器，风扇的摆放在位置选择上将更为灵活，以及，还可能设置电路板等结构，也有利于减小整机结构在某一方向的长度，或者整机的体积。
作为图5G的变型，与图5G所示的光路同的是，上述蓝色激光器组件和绿色激光器组件的位置也可以进行调换，比如图5H所示。蓝色激光器组件120与绿色激光器组件130的位置对调，使得绿色激光器组件130比蓝色激光器组件120更靠近红色激光器组件110；此时，第一激光器组件为红色激光器组件110，第一激光为红色激光；第二激光器组件为绿色激光器组件130，第二激光为绿色激光；第三激光器组件为蓝色激光器组件120，第三激光为蓝色 激光。其中，绿色激光器组件130面向第二合光镜107设置，蓝色激光器组件120面向第一合光镜106设置，这样，根据上述的透反率计算，绿色激光的光能损耗为1-97％*99％＝4％，蓝色激光器组件的光能损耗则为1-99％*99％99％＝3％，而绿色激光的光路径要短于蓝色激光的光路径，从而整体上两者的光损率几乎可视为一致。
在上述多个实施例中，通过将红色激光器组件靠近光源的出光口设置，而蓝色和绿色激光分别经过转折光路后与红色激光汇合，使红色激光的光路径最短，可以减轻红色激光的传输光损，且红色激光仅经过一次光学元件的透射，蓝色激光和绿色激光分别经过多次透反处理，从而红色激光在光学元件透过率方面的损耗也相应最低，因此，可以保证红色激光在合束之前的光损尽量的减轻，利于维持三色光源光束功率和颜色的配比，使得系统白平衡接近理论设定值，实现较高的投影画面质量。
参见图5B和图5G，图5H，上述激光投影设备应用实施例中的光源，三色激光通过合光镜组(合光镜组包括第一合光镜、第二合光镜和第三合光镜)后，还要经过匀化元件和会聚镜组，对光束进行匀化和缩束处理，以便后面光机中收光元件的光收集效率和匀化效率的提高。
在一些实施例中，如图5B和图5G，图5H所示，光源100还包括匀化元件109和会聚镜组111。匀化元件109设置于第三合光镜108与会聚镜组111之间。示例地，匀化元件为具有规则排布微结构的匀化扩散片，如图9A所示。目前常用的扩散片的微结构是随机无规律的，然而本光源架构中使用的匀化扩散片的利用规律排布的微结构。匀化扩散片利用类似复眼透镜对光束匀化的原理，可以将激光光束的能量分布从高斯型，变为图9B所示的形状，由图9B所示，激光中心光轴附近的能量被大大消弱，变得平缓，激光光束的发散角度也增加，从而能量被匀化的效果大大优于常用的无规律排布微结构的扩散片。
上述匀化扩散片可以在单面设置规律排布的微结构，也可以在双面分别设置规律排布的微结构。
通过上述匀化扩散片的匀化后，激光光束再经过会聚镜组进行光斑尺寸的缩小。一方面，对高能的激光光束先进行匀化，可以减轻对后端元件的能量分布不均带来的冲击，另一方面，先进行匀化，在进行缩束，也可以降低缩束后光斑再次匀化的难度。
示例性地，上述匀化元件109为衍射元件，例如直线光栅或二维光栅 (即二维衍射元件)，又或者是菲涅尔透镜。通过将匀化元件109设置为衍射元件也可以达到较佳的匀化效果。
在一些实施例中，会聚镜组包括两片凸透镜的组合，这两片凸透镜中的任一凸透镜包括平凸透镜、双凸透镜或凹凸透镜中的至少一个。比如两片凸透镜的组合包括一片双凸透镜和一片凹凸透镜(Positive meniscus，正弯月透镜)组合。其中，凹凸透镜是指其凹面的凹度(凹面的弯曲度)小于其凸面的凸度(凸面的弯曲度)的透镜，也就是说，凹凸透镜的凹面的曲率半径小于其凸面的曲率半径。上述两个透镜均为球面透镜，当然也可以都采用非球面透镜，但球面透镜在成型和精度控制上都比非球面透镜要更加容易，成本上也可以降低。在本示例中，会聚镜组用于对光束进行会聚，会聚镜组的焦点设置于后端收光元件的收光口处，即会聚镜组的焦平面位于收光元件的入光面处，提高收光元件的收光效率。
示例性地，上述会聚镜组仅包括一凸透镜，这样也可以实现对光束进行会聚，而且还减少了透镜数量，简化了会聚镜组的结构。
在一些实施例中，如图5B所示，会聚镜组位于光源壳体的第一出光口103处，例如会聚镜组中的后端透镜或者整个透镜组安装至第一出光口103处，且会聚镜组111与第一出光口103周围的壳体填充密封件，比如密封橡胶圈。这样在会聚镜组固定的同时，还可以保持光源壳体内部的气密密封，防止灰尘颗粒从第一出光口进入到光源壳体的内部。并且将会聚镜组直接固定于第一出光口103位置还有利于缩短光路路径，以及减小光源壳体的体积。
从第一出光口103输出的呈会聚状态的光束，最终要被光机照明光路的收光部件收集。如图8A所示的光路原理示意图，在本示例中，收光部件250为光导管。示例地，光导管具有矩形的入光面和出光面。光导管既作为收光部件同时也作为匀光部件。光导管的入光面为会聚镜组111的焦平面，会聚镜组111将会聚后的光束输入光导管，光束在光导管内部经过多次反射，并从出光面出射。由于前端光路中设置了匀化扩散片，此处再经过光导管的匀化，可以达到较佳的三色混合匀化效果，提高了照明光束的质量。
需要说明的是，光源为纯三色激光光源，散斑是激光特有的现象， 为了获得较高投影画面显示质量，需要对三色激光进行消散斑处理。在本示例中，如图8A所示，会聚镜组111和收光部件250之间还设置有扩散轮260，即旋转的扩散片。扩散轮260位于会聚镜组111的会聚光路中，扩散轮260轮面距离收光部件250(例如光导管)的入光面约为1.5mm～3mm之间，例如1.5mm、2.0mm、2.5mm或3mm。扩散轮可以对呈会聚状态的光束进行扩散，增加光束的发散角度，并且增加随机相位。由于人眼对不同颜色激光的散斑敏感度不同，可以对扩散轮进行分区。比如将扩散轮分为第一分区和第二分区，第一分区配置为透射红色激光，第二分区配置为透射蓝色激光和绿色激光，第一分区的发散角度稍大于第二分区的发散角度；或者，将扩散轮分为三个分区，分别对应红色激光，绿色激光，蓝色激光；其中，上述三个分区中，各色激光分区的发散角度大小关系为，红色激光分区发散角度最大，蓝色激光分区发散角度最小。当扩散轮具有对应的分区时，扩散轮的旋转周期可以和光源的周期一致。通常扩散轮为一片扩散片时，其旋转周期并不特殊限定。
光导管具有一定的收光角度范围，比如正负23度范围内的光束可以进入光导管，并被后端照明光路利用，而其他大角度的光束则成为杂散光被挡在外，形成光损。扩散轮出光面靠近光导管入光面设置，可以提高扩散后激光光束被收入光导管内的光量，提高光利用率。
在另一些示例中，上述收光部件为复眼透镜。
如前所述，由于在前端光路中设置了匀化扩散片109，光源光束经过匀化后，被会聚镜组111会聚，并入射至扩散轮260。激光光束先经过了一片静止的扩散片(匀化扩散片109)，再经过一片运动的扩散片(扩散轮260)。这样，在静止的扩散片对光束匀化的基础上，再次对激光光束进行扩散匀化，可以增强激光光束的匀化效果，降低激光光束光轴附近光束的能量占比，从而降低激光光束的相干程度，投影画面呈现的散斑现象也就可以大大改善。
需要说明的是，光源100可以包括上述匀化扩散片109、会聚镜组111和扩散轮260中的至少一个。例如，在从第三合光镜108至光源的出光口的光路中，匀化扩散片109、会聚镜组111和扩散轮260是按顺序排列的。当省略使用其中的一个或两个时，匀化扩散片109、会聚镜组111 和扩散轮260的排列顺序不变。
在上述一些实施例提供的光源中，光源光束入射至光导管进行收光后，光导管对光线再次匀化，本公开发明人在光导管入光面测得光斑分布会呈现较为明显的内外圈颜色分界现象。比如，图10所示的光斑示意图，会聚的光斑呈现圆形，最外圈呈现红色，依次向内为紫，蓝等不同同心圆的光圈。通过研究发现，如前面提到的，红色激光器组件由于发光原理的不同，其快慢轴的发散角度要大于蓝色激光器和绿色激光器的发散角度。虽然在本示例中，三色激光器组件使用相同数量芯片的阵列排布，在体积外观上尺寸一致，但由于红色激光本身的特点，这使得红色激光光束在传输过程中的光斑尺寸要大于蓝色激光和绿色激光的光斑尺寸。这种现象在进行三色合光时就已经存在，并且随着光路径传输距离的增大，其发散角度增大的速度大于另外另种颜色的激光，使得虽然三色合光会会进行匀化，缩束，以及还可能经过旋转扩散片的再次扩散匀化，但始终会存在红色激光的光斑尺寸要大一些。在光导管入光面的测试光斑也呈现了这个现象。
为了提高三色激光光斑的重合度，可以增长光导管的长度，来提高混光匀化效果，但是这会给增加光路长度，增大结构体积。
在本示例中提出了一种解决方案，在前述图5G和图5H提供的光路原理图基础上，在所述蓝色激光的光路中设置第一扩散片，所述第一扩散片被配置为扩散并透过所述蓝色激光；并在所述绿色激光的光路中设置第一扩散片，所述第二扩散片被配置为扩散并透过所述绿色激光。例如，第一扩散片设置在蓝色激光器组件的发光面与对应的合光镜之间，第二扩散片设置在绿色激光器组件的发光面与对应的合光镜之间。
此外，本示例还提供了另一种解决方案，在前述图5G和图5H提供的光路原理图基础上，如图8B所示，在蓝色激光和绿色激光的合光光路中设置一片第三扩散片112，对蓝色激光和绿色激光先进行发散后再与红色激光光束合光。其中第三扩散片112设置与第二合光镜107入射第三合光镜108之间的光路中。
通过在蓝色激光和绿色激光的光路径中设置一片第三扩散片112，可以对蓝色激光和绿色激光进行扩束，比如设置为1度～3度的扩散角度， 经过该第三扩散片112后，经过扩束的蓝色激光和绿色激光再与红色激光进行合光，此时三色激光的光斑大小相当，光斑重合度提高。重合度较高的三色光斑也利于后续光路的匀化和消散斑，提高光束质量。
本公开的另一示例提供了另一种解决方案，在前述图2A和2B提供的光路原理图的基础上，如图8C所示，在红色激光的光路中设置望远镜系统113。望远镜系统113配置为透过红色激光，并对红色激光进行缩束。示例性地，如图8C所示，望远镜系统包括凸透镜1131和凹透镜1132，凸透镜1131比凹透镜1132更靠近红色激光器组件，这样可以缩小红色激光器组件发出的红色光束。其中，如图8C所示，凸透镜1131为平凸透镜，平凸透镜具有相对的平面和凸面，平凸透镜的凸面朝向红色激光器组件110；凹透镜1132为平凹透镜，平凹透镜具有相对的平面和凹面，平凹透镜的凹面朝向平凸透镜的平面设置。
激光器发出的激光为线偏振光，红色激光发光过程中与蓝色激光、绿色激光发光过程中，谐振腔振荡的模式不同，导致红色激光线偏振光的偏振方向与蓝色激光线偏振光、绿色激光线偏振光的偏振方向呈90度，红色激光为P光线偏振光，蓝色激光和绿色激光为S光线偏振光。
在上述一些实施例中，如图1A，图5B所示的光源中，采用红色激光器组件发出的光束的偏振方向与蓝色激光器组件、绿色激光器组件发出的光束的偏振方向呈90度，其中，红色激光是P光，蓝色激光和绿色激光是S光。激光投影设备投射成像的三色光束存在偏振方向不同。
而在实际应用中，激光投影设备为了更好还原色彩和对比度，通常还要配合具有较高增益和对比度的投影屏幕，比如光学屏幕，能够较好的还原高亮度和高对比度的投影画面。
图4A示出了一种超短焦投影屏幕，该投影屏幕为菲涅尔光学屏幕。沿投影光束入射方向，菲涅尔光学屏幕包括基材层401，扩散层402，均匀介质层403，菲涅尔透镜层404以及反射层405。菲涅尔光学屏幕的厚度通常在1mm～2mm之间，其中基材层401占据的厚度比例最大。基材层401同时也作为整个屏幕的支撑层结构，具有一定的透光率以及硬度。投影光束首先透射通过基材层401，然后进入扩散层402进行扩散，再进入 均匀介质层403，均匀介质层403为均匀透光介质，比如与基材层401材质相同的介质。光束透射通过均匀介质层403，入射菲涅尔透镜层404。菲涅尔透镜层404将光束进行会聚准直，准直后的光束被反射层反射后折返再次通过菲涅尔透镜404，均匀介质层403，扩散层402，以及基材层401并入射至用户眼中。
本公开发明人在研发过程中发现，应用上述三色激光光源的超短焦投影画面会出现局部偏色，而造成“色斑”、“色块”等色度不均匀的现象。造成这种现象的原因一方面是由于在目前应用的三色激光器中，不同颜色的激光光束的偏振方向不同。在光学系统中通常设置有多片光学镜片，比如透镜，棱镜；而光学镜片本身对于P偏振光和S偏振光的透反率存在差异，比如光学镜片对于P光的透过率相对大于对S光的透过率。而另一方面，因为屏幕材质结构的原因，随着超短焦投影光束入射角度的变化，超短焦投影屏幕本身会对不同偏振方向的光束的透过率和反射率呈现明显的变化。如图4B所示，对于红色投影光束，当投射角度为60度左右时，经试验，投影屏幕对P光类型的红色投影光束的反射率和对S光类型的红色投影光束的反射率相差10个百分点以上。也就是说，超短焦投影屏幕对P光的反射率大于对S光的反射率，这样会使得较多的P光被屏幕反射进入人眼，而被屏幕反射进入人眼的S光则相对减少。这种对同种颜色不同偏振方向光的透反差异现象，对投影光束为其他颜色时也同样存在。而当三基色光为不同的偏振态时，经过上述投影光学系统和投影屏幕后，这种透反差异现象(尤其是投影屏幕相对明显的透反差异)，会造成不同颜色的光被屏幕反射进入人眼的光通量发生失衡，最终导致在投影画面上局部区域的偏色现象，这在呈现彩色画面时尤其明显。
为了解决上述问题，在上述一些实施例提供的光源基础上进行了改进，提出另一种光源结构。
在一些实施例中，蓝色激光器组件和绿色激光器组件相邻设置，在蓝色激光和绿色激光的输出路径中且入射至第三合光镜之前设置相位延迟片(例如半波片)，以改变蓝色激光和绿色激光的偏振方向，使其与红色激光的偏振方向相同，解决因偏振方向不同而最终导致投影画面的偏色现象。
首先介绍一下相位延迟片的工作原理。相位延迟片是对应某种颜色的波长，通过晶体生长的厚度影响透过光束的相位改变程度。在本示例中，相位延迟片为半波片，也称λ1/2波片，可以将对应颜色波长的光束的相位改变π，即180度，并使对应颜色波长的偏振方向旋转90度，比如将P光变为S光，或者把S光变为P光。如图11A所示，半波片为晶体，晶体具有自身的光轴W，位于半波片所在平面内。半波片设置于光路中，垂直于光源的光轴O，因此半波片的光轴W与光源的光轴O互相垂直。
如图11B所示，以半波片的光轴W建立坐标系，P偏振光沿光轴W和与光轴W垂直的方向构成的坐标系具有分量Ex，Ey。其中，Ex，Ey均可利用光波公式来表示。P光可视为分量Ex，Ey两个维度波的空间合成。
当P光经过半波片后，相位改变π，即180度，Ex，Ey的相位常量均具有π的改变量。对于原偏振方向的某一时刻的光波b0，c0，a0进行了180度相位改变后，并在两个方向分量的光波进行叠加后，光波在空间中的偏振位置发生变化，形成了b1，c1，a1，从而成为S偏振方向的光。上述b0，c0，a0和b1，c1，a1的空间位置变化仅是举例说明。
经过半波片后，原先为P偏振方向的光变为S偏振方向的光。如图11C所示，两个偏振方向互相垂直。
基于上述说明，如图12A所示的光路原理示意图，分别在蓝色激光器组件和绿色激光器组件的出光路径中设置对应波长的相位延迟片，相位延迟片例如为半波片。在本示例中，蓝色激光的中心波长在465nm左右，绿色激光的中心波长在525nm左右。在如图12A所示的光路原理图中，第一半波片121(即第一相位延迟片)位于蓝色激光的出光路径中，其对应蓝色激光的中心波长设置，第二半波片131(即第二相位延迟片)位于绿色激光的出光路径中，其对应绿色激光的中心波长设置。这样可以将绿色激光和蓝色激光的偏振方向均改变90度，从S光变为P光。
基于上述光路原理，在一些示例中，上述半波片(例如第一半波片121和第二半波片131)设置在光源壳体中，位于光源壳体内侧与激光器组件对应的合光镜之间，通过在光源壳体的底壁设置镜片底座，对半波片进行固定。
在另一些示例中，上述半波片(例如第一半波片121和第二半波片131) 设置于光源壳体上为激光器组件开设的窗口内侧，比如通过胶粘或者固定支架的方式固定在窗口内侧。
在又一些示例中，上述半波片(例如第一半波片121和第二半波片131)设置在激光器组件与光源壳体窗口的外侧之间，比如，半波片贴装或者固定在窗口外侧，激光器组件(包括固定支架)再通过固定支架安装在窗口外侧的安装位上。
在又一些示例中，在窗口玻璃处设置有密封玻璃的情况下，半波片(例如第一半波片121和第二半波片131)可以位于密封玻璃和激光器组件的发光面之间。如图5E-2所示的激光器组件结构分解图，在激光器组件的固定支架透光窗框1041正面还具有承靠台(图中未示出)，半波片140可以通过胶粘固定在承靠台上。承靠台四周还具有容纳槽，用于容纳第一密封件1051。图5C-2示出了半波片安装在固定支架正面的示意图，其中半波片141安装在固定支架透光窗框1041位置处，并通过四周的点胶槽104A点胶固定。其中，半波片141的长宽范围分别为25～30mm，21～28mm；固定支架的透光窗框的长宽范围分别为20～24mm，18～20mm。比如在一种实施例中，半波片选取30mm*28mm，透光窗框的大小则为24mm*20mm。
半波片141固定到固定支架104上之后，与安装在固定支架上的MCL型激光器组件一并安装至光源壳体102的窗口1021的安装位上。如前所述，光源壳体的窗口1021的安装位上还设置有第二容纳槽，用于容纳第二密封件1052，密封玻璃105被激光器组件上的第一密封件1051和第二密封件1052夹在中间。基于上述结构，激光器组件的光束从发光芯片发出后，依次经半波片141，密封玻璃105透射后从光源壳体的窗口1021进入光源壳体的内部。
在上述光源结构中，在蓝色激光器组件和绿色激光器组件的固定支架上均安装有对应颜色的半波片，从而经过对应的半波片后，光束偏振极性发生90度变化。绿色激光入射至第一合光镜时已经为P光，蓝色激光入射至第二合光镜时也已经为P光，从而经过第二合光镜将蓝色激光和绿色激光合束后输出的光束均为P偏振光，这与红色激光的偏振方向相同。第三合光镜将偏振方向一致的三色光束合光输出，再经过匀化、缩束等处理，进入光机照明光路，经DMD芯片反射进入镜头，由镜头投射到屏幕上成像。由于三色偏振方向一致，投影画面的“色斑”、“色块”等色度不均匀的现象可以消除或大大缓解。
作为上述一些实施例的一种变型，在另一些实施例中，蓝色激光和绿 色激光先进行合束后再与红色激光进行合束，此时半波片还可以设置在蓝色激光和绿色激光合束之后且与红色激光合束之前的光路中。示例地，如图12B所示，提供了另一种光源光路原理示意图，第四半波片141(即第四相位延迟片)可以设置在第二合光镜107和第三合光镜108之间，透射从第二合光镜107出射的蓝色激光和绿色激光的合光光束。基于上述光路原理，绿色激光、蓝色激光分别输出S偏振光，绿色S光入射至第一合光镜106并被反射，蓝色S光入射至第二合光镜107，并被透射。第二合光镜107还反射绿色S光，此处第二合光镜107为基于波长而非偏振态选择的二向色片。第二合光镜107将均为S光的蓝色激光和绿色激光合束后经过第四半波片141，第四半波片141对绿色激光和蓝色激光的偏振方向改变，再入射至第三合光镜108。
需要说明的是，在图12B所示的光路原理示意图中，第四半波片141可以针对其中一种颜色的波长设置，比如针对绿色激光的波长设置，绿色激光透过第四半波片141后偏振方向旋转了90度，从原来的S光变为P光。蓝色激光透过第四半波片141后，由于该半波片的波长不对应蓝色波长设置，因此蓝色激光偏振方向偏转不是90度，但接近P偏振方向，由于人眼对于蓝色的视觉函数较低，对于蓝色的敏感度较低，因此蓝色在出现偏色时视觉不适感不如在红色和绿色出现色偏时明显。又例如，第四半波片141针对蓝色和绿色中心波长的中间数值进行设置，这样对于绿色激光和蓝色激光的偏振方向改变都不是90度，但是均接近90度，虽然蓝色激光和绿色激光均没有从S光偏转为P光，但是也均不是原来的S光偏振态，也可以提高整个系统对红、绿、蓝三基色的光处理过程一致性，可以改善投影画面上局部区域呈现的“色斑”“色块”等色度不均匀的技术问题，其原理不再赘述。
在上述示例中，半波片141可以通过设置在光源壳体底壁上的固定基座进行固定。
在图12B所示的光源光路原理图基础上，一种激光投影设备的光学原理示意图可如图12D所示，其工作过程参考前述，不再赘述。需要说明的是，在图12D所示的光学原理图中，在蓝色激光和绿色激光的合光光路中设置了第四半波片141，此处可同时设置第三扩散片112，也可不再设置第三扩散片112。以及，在本图的示例中，也并不限定蓝色激光器组件和绿色激光器组件的排列关系，即蓝色激光器组件与绿色激光器组件的位置可调换。
需要说明的是，在图12B和12D中所示的设置半波片的方案同样适用于图5G，5H，图8A，图8B或图8C所示的光路原理图所提供的光路架构中。 其工作原理同上不再赘述。
在光学系统中，对不同波长而言，同一光学镜片对不同波长的P光、S光的透过率有微小差异，对P光和S光的反射率也有微小差异。这里的光学镜片包括整个激光投影设备中的各种光学镜片，比如会聚镜组，光机照明光路中的透镜组，以及镜头中的折射透镜组。因此，当激光光源发出的光束经过整个投影光学系统后，这种透反差异是整个系统叠加的结果，会更为明显。
本公开示例中，在未加半波片之前，红色激光为P线偏振光，蓝色激光和绿色激光为S线偏振光。此时，无论是光学系统的光学镜片，还是投影屏幕，都对P光和S光的选择性透过较明显。比如在随着投影光束入射角度的不同，投影屏幕对于P光(红光)的透反率要明显大于对于S光(绿光和蓝光)的透反率，这就造成了投影画面的局部色度不均匀问题，即画面上出现的“色斑”、“色块”现象。
在上述提供的一些实施例中，通过在蓝色激光和绿色激光的出光路径中设置半波片，例如在分别针对蓝色激光和绿色激光设置对应波长的半波片时，能针对性地使蓝色激光和绿色激光的偏振方向都可以发生90度的改变。在本示例中从S光偏振方向变为P光偏振方向，与红色激光的偏振方向一致，从而在经过同一套光学成像系统并经投影屏幕反射入人眼的过程时，变为P偏振光的蓝色激光和绿色激光在光学镜片中的透过率与原本为P光的红色激光的透过率相当，光处理过程的一致性接近，以及投影屏幕对三色激光的反射率差异也减小，整个投影系统对三色基色光的光处理过程一致性提高，从根本上能够消除投影画面上局部区域呈现的“色斑”“色块”的偏色现象，提高投影画面显示质量。
在上述提供的一些实施例中，当在蓝色激光和绿色激光的合光光路中设置一片半波片时，可以对绿色激光或蓝色激光中的一种颜色激光的偏振方向改变90度，或者对两种颜色的激光的偏振方向都改变不为90度，但均接近为90度。这样，也同样可以减轻蓝色激光和绿色激光的S光与红色激光P光的偏振差异性。基于上述原理，同样也可以提高整个系统对红、绿、蓝三基色的光处理过程一致性，可以改善投影画面上局部区域呈现的“色斑”“色块”等色度不均匀的技术问题。
由于在光学系统中光学镜片对P偏振光的透过率通常大于对S偏振光的透过率，且本公开一些示例中应用的投影屏幕对于P偏振光的反射率也大于对S偏振光的反射率，因此，通过将S偏振光的蓝色激光和绿色激光转换 为P偏振光，这样红，绿，蓝三色激光均为P光，还能够提高整个系统中投影光束的光传递效率，能够提高整个投影画面的亮度，提高投影画面质量。
作为解决上述投影画面上呈现的“色斑”“色块”等色度不均匀的技术问题的另一种手段，本公开一些实施例提供了一种激光投影设备，应用如图12C所示的光源。在本示例中，在红色激光光束与蓝色、绿色激光光束合束之前设置有对应红色波长的半波片。比如，第三半波片151(即第三相位延迟片)，设置于红色激光器组件110和第三合光镜108之间。
第三半波片151的设置方案可参见上一实施例中对蓝色激光和绿色激光分别设置半波片的方案。
比如，在一些示例中，第三半波片151设置在光源壳体中，位于光源壳体内侧与第三合光镜之间的光路径中，通过在光源壳体底壁设置镜片底座，对第三半波片151进行固定。
在另一些示例中，第三半波片151设置于光源壳体上为红色激光器组件开设的窗口内侧，比如通过胶粘或者固定支架的方式固定在窗口内侧。
在又一些示例中，第三半波片151设置在红色激光器组件与光源壳体窗口的外侧之间，比如，第三半波片151贴装或者固定在窗口外侧，激光器组件(包括固定支架)再通过固定支架安装在窗口外侧的安装位上。
在又一些示例中，当窗口玻璃处设置密封玻璃时，第三半波片151可以位于密封玻璃和激光器组件发光面之间。具体地安装方式也同样可以参照图5E-2的介绍，此处不再赘述。
第三半波片151对应红色激光的波长设置，同理，经过第三半波片151可以将红色激光偏振方向旋转90度，红色激光由P偏振光变为S偏振光。
需要说明的是，对上述红色激光设置半波片的方案也同样适用本发明图5G，图5H，图8A，图8B或图8C所示的光路原理图中，其原理同上不再赘述。
上述示例中，通过在红色激光输出光路径中设置第三半波片151，将原先为P偏振光的红色激光转换为S偏振光，与蓝色激光和绿色激光的偏振方向一致，这样系统的三色光的偏振方向相同。参照前述实施例原理描述，投影光学系统对同为S偏振光的红色激光和蓝色激光、绿色激光的透过率相比于为不同偏振方向偏振光时的差异缩小，超短焦投影屏幕对同为S偏振光的三色光的反射率也基本一致，从而对各基色的光处理一致性提高，可以消除或改善投影画面呈现的“色斑”“色块”等色度不均匀的现象。
在上述一些实施例中，激光器发光面为矩形，对应地，相位延迟片对应设置在一种颜色或两种颜色的光输出路径中，其形状也为矩形。激光器的矩形发光区域的长边和短边分别与相位延迟片矩形受光区域的长边和短边平行。
由于激光光束含有较高的能量，光学镜片(比如透镜、棱镜)的性能在工作过程中会伴随温度变化。例如，光学镜片在制作工艺过程中形成有内应力，这种内应力随着温度变化释放，会形成应力双折射。而这种应力双折射会造成对于不同波长的光束具有不同的相位延迟，可视为二次相位延迟。因此在实际光路中，光束的相位改变是基于半波片和光学镜片的应力双折射作用叠加后的效果，而这种光学镜片固有造成的延迟量会根据系统设计而不同。上述一些实施例在应用时，可以对实际系统造成的二次相位延迟进行校正，以接近或达到光束偏振方向改变90度的理论值。
各半波片在其平片所在平面内具有光轴，如图11A所示，半波片的光轴W与系统光轴O呈空间垂直关系，半波片的光轴平行于半波片的长边或短边。在应用上述方案时，如图11D所示，将半波片设置为：沿矩形半波片的长边或者短边方向，将半波片按照预设角度，比如C度进行旋转，如图中虚线所示。经过上述角度的偏转，半波片的光轴也发生了正负C度左右的偏转，从而对光束相位的改变为180度±2C度左右，再与系统光学镜片的的二次相位延迟相叠加，最终使得光束的偏振方向改变在90度左右，以接近理论设计值。在本申请上述一些实施例中，C可取值10。
上述一个或多个实施例中，针对激光投影光源具有不同偏振方向的三基色光的情况，通过在激光投影设备光源中的一种颜色或两种颜色的光输出路径中设置半波片，能够改变对应透过的一种或两种颜色的光的偏振方向，使与其他颜色的偏振方向一致，以使激光投影设备输出的三基色光的偏振方向相同。从而，使该激光投影设备的光源发出的激光光束在经过同一套光学成像系统并经投影屏幕反射入人眼的过程中，光学系统对三色激光的透过率接近，投影屏幕对三色激光的反射率差异也减小，整个投影系统对三色基色光的光处理过程一致性提高，从根本上能够消除投影画面上局部区域呈现的“色斑”、“色块”此类色度不均匀的现象，提高投影画面显示质量。
本领域技术人员能够理解，上述多个实施例在解决由于三基色光偏振方向不同，以及投影屏幕对不同偏振方向的光的透过率的明显差异导致的投影图像显示问题时，以红色激光为P光，蓝色和绿色激光为S光进行举例说 明，并不限于这一种P光和S光的组合，本领域技术人员可以根据实际光束的颜色和偏振方向，结合本申请实施例所体现的核心原理进行适应性的改变，上述改变也应在本申请的保护范围之内。
最后应说明的是：以上各实施例仅用以说明本公开的技术方案，而非对其限制；尽管参照前述各实施例对本公开进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本公开各实施例技术方案的范围。

Claims (20)

  1. 一种激光光源，包括：
    第一激光器组件，设置在第一平面上，并被配置为发出第一激光；
    第二激光器组件，设置在与所述第一平面垂直的第二平面上，并被配置为发出第二激光；
    第三激光器组件，在所述第二平面上与所述第二激光器组件并列设置；所述第二激光器组件比所述第三激光器组件更靠近所述第一激光器组件；所述第三激光器组件被配置为发出第三激光；
    第一合光镜，设置在与所述第三激光器组件相对的位置处，并被配置为反射所述第三激光；
    第二合光镜，设置在所述第三激光与所述第二激光的交汇处，并被配置为透射所述第二激光、反射所述第三激光；
    第三合光镜，设置于所述第一激光与经过所述第二合光镜后的所述第二激光和所述第三激光的交汇处，并被配置为透射所述第一激光、反射所述第二激光和所述第三激光，以使所述第一激光、所述第二激光与所述第三激光射向所述激光光源的出光口。
  2. 根据权利要求1所述的激光光源，其中，
    所述第一激光器组件包括红色激光器组件，所述第一激光包括红色激光；
    所述第二激光器组件包括蓝色激光器组件，所述第二激光包括蓝色激光；
    所述第三激光器组件包括绿色激光器组件，所述第三激光包括绿色激光。
  3. 根据权利要求1所述的激光光源，其中，
    所述第一激光器组件包括红色激光器组件，所述第一激光包括红色激光；
    所述第二激光器组件包括绿色激光器组件，所述第二激光包括绿色激光；
    所述第三激光器组件包括蓝色激光器组件，所述第三激光包括蓝色激光。
  4. 根据权利要求1～3中任一项所述的激光光源，其中，
    所述第二合光镜的光反射率大于所述第二合光镜的光透射率；
    所述第三合光镜的光反射率大于所述第三合光镜的光透射率。
  5. 根据权利要求1～3中任一项所述的激光光源，其中，
    所述第一合光镜与所述第二合光镜相互平行；
    所述第二合光镜与所述第三合光镜相互垂直。
  6. 根据权利要求1～3中任一项所述的激光光源，还包括以下至少一个：
    匀化元件，设置于所述第三合光镜至所述出光口的光路中；
    会聚镜组，设置于所述匀化元件至所述出光口的光路中；或者，
    扩散轮，设置于所述会聚镜组至所述出光口的光路中。
  7. 根据权利要求6所述的激光光源，其中，所述匀化元件包括以下至少一个：
    匀化扩散片，所述匀化扩散片上具有规律排布的微结构；或者，
    衍射元件。
  8. 根据权利要求6所述的激光光源，其中，所述会聚镜组包括两片凸透镜的组合，所述两片凸透镜中的任一凸透镜包括平凸透镜、双凸透镜或凹凸透镜中的至少一个。
  9. 根据权利要求2或3所述的激光光源，还包括以下至少一个：
    第一扩散片和第二扩散片；所述第一扩散片设置于所述蓝色激光的光路中，并被配置为扩散并透过所述蓝色激光；所述第二扩散片设置于所述绿色激光的光路中，并被配置为扩散并透过所述绿色激光；或者，
    望远镜系统，所述望远镜系统设置于所述红色激光的光路中，并被配置为透过所述红色激光并对所述红色激光缩束。
  10. 根据权利要求9所述的激光光源，其中，所述望远镜系统包括凸透镜和凹透镜，所述凸透镜比所述凹透镜更靠近所述红色激光器组件。
  11. 根据权利要求2或3所述的激光光源，还包括：
    第三扩散片，设置于所述第二合光镜至所述第三合光镜的光路中，所述第三扩散片被配置为扩散并透射所述绿色激光和所述蓝色激光。
  12. 根据权利要求2或3所述的激光光源，其中，所述蓝色激光和所述绿色激光的偏振方向相同，所述红色激光与所述绿色激光的偏振方向不同；
    所述激光光源还包括以下之一：
    第一相位延迟片和第二相位延迟片，所述第一相位延迟片设置于所述蓝色激光的光路中，并被配置为改变所述蓝色激光的偏振方向；所述第二相位延迟片设置于所述绿色激光的光路中，并被配置为改变所述绿色激光的偏振方向；或者，
    第三相位延迟片，设置于所述红色激光的光路中，并被配置为改变所述红色激光的偏振方向。
  13. 根据权利要求12所述的激光光源，其中，
    所述第一相位延迟片配置为与所述蓝色激光的波长相对应；
    所述第二相位延迟片配置为与所述绿色激光的波长相对应；
    所述第三相位延迟片配置为与所述红色激光的波长相对应。
  14. 根据权利要求12所述的激光光源，其中，
    所述第一相位延迟片包括第一半波片；
    所述第二相位延迟片包括第二半波片；
    所述第三相位延迟片包括第三半波片。
  15. 根据权利要求2所述的激光光源，其中，所述蓝色激光和所述绿色激光的偏振方向相同，所述红色激光与所述绿色激光的偏振方向不同；
    所述激光光源还包括：
    第四相位延迟片，设置于所述第二合光镜至所述第三合光镜的光路中；
    所述第四相位延迟片配置为以下之一：
    与所述绿色激光的波长相对应；或者，
    与所述绿色激光的波长和所述蓝色激光的波长之间的波长相对应。
  16. 根据权利要求2或3所述的激光光源，其中，
    所述绿色激光器组件的发光功率，小于所述红色激光器组件的发光功率及所述蓝色激光器组件的发光功率；
    所述红色激光器组件的发光功率小于所述蓝色激光器组件的发光功率。
  17. 根据权利要求2或3所述的激光光源，其中，
    所述绿色激光器组件的发光功率为12W～28W；
    所述红色激光器组件的发光功率为24W～56W；
    所述蓝色激光器组件的发光功率为48W～115W。
  18. 根据权利要求1～3中任一项所述的激光光源，还包括：
    光源壳体，所述光源壳体包括底壁和顶盖，以及位于所述底壁和顶盖之间的多个侧壁；
    所述第一激光器组件设置在所述光源壳体的第一侧壁上，所述第二激光器组件和所述第三激光器组件并列设置在所述光源壳体的与第一侧壁垂直的第二侧壁上；
    所述光源壳体上具有所述出光口，所述第三合光镜反射的激光经所述出光口射出至所述光源壳体外。
  19. 根据权利要求18所述的激光光源，其中，
    所述光源壳体的第一侧壁包括与所述第一激光器组件对应的窗口，且所述光源壳体的第二侧壁包括与所述第二激光器组件和所述第三激光器组件对应的窗口；
    所述激光光源还包括密封玻璃，所述密封玻璃设置在每一个所述窗口处，且所述密封玻璃将所述第一激光器组件、第二激光器组件和第三激光器组件与所述光源壳体的内部腔体隔离。
  20. 一种激光投影设备，包括
    整机壳体；
    安装于所述整机壳体内的激光光源，所述激光光源为如权利要求1～19中任一项所述的激光光源；
    安装于所述整机壳体内的光机和镜头，所述光机和所述镜头连接，所述激光光源被配置为向所述光机提供照明。
PCT/CN2019/125368 2019-03-20 2019-12-13 激光光源和激光投影设备 WO2020186843A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/744,722 US11079665B2 (en) 2019-03-20 2020-01-16 Laser projection apparatus

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN201910214208 2019-03-20
CN201910214208.6 2019-03-20
CN201910538767.2 2019-06-20
CN201910539490.5 2019-06-20
CN201910538767.2A CN112114483B (zh) 2019-06-20 2019-06-20 激光投影设备
CN201910539490.5A CN111722464B (zh) 2019-03-20 2019-06-20 激光投影设备

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US16/744,722 Continuation US11079665B2 (en) 2019-03-20 2020-01-16 Laser projection apparatus

Publications (1)

Publication Number Publication Date
WO2020186843A1 true WO2020186843A1 (zh) 2020-09-24

Family

ID=72519668

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/125368 WO2020186843A1 (zh) 2019-03-20 2019-12-13 激光光源和激光投影设备

Country Status (1)

Country Link
WO (1) WO2020186843A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11402733B2 (en) 2020-05-29 2022-08-02 Mega1 Company Ltd. Projecting apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102402110A (zh) * 2010-09-15 2012-04-04 凤凰光学(上海)有限公司 一种三基色led发光结构
CN203217229U (zh) * 2013-03-01 2013-09-25 深圳市绎立锐光科技开发有限公司 一种发光装置及投影系统
US20140016102A1 (en) * 2012-07-10 2014-01-16 Forward Electronics Co., Ltd. Dynamic diffractive image projection device
CN104808426A (zh) * 2012-04-10 2015-07-29 海信集团有限公司 一种投影显示光源
CN107608166A (zh) * 2016-07-12 2018-01-19 松下知识产权经营株式会社 光源装置以及投射型显示装置
CN207689821U (zh) * 2017-11-11 2018-08-03 深圳市中科创激光技术有限公司 一种激光显示光源

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102402110A (zh) * 2010-09-15 2012-04-04 凤凰光学(上海)有限公司 一种三基色led发光结构
CN104808426A (zh) * 2012-04-10 2015-07-29 海信集团有限公司 一种投影显示光源
US20140016102A1 (en) * 2012-07-10 2014-01-16 Forward Electronics Co., Ltd. Dynamic diffractive image projection device
CN203217229U (zh) * 2013-03-01 2013-09-25 深圳市绎立锐光科技开发有限公司 一种发光装置及投影系统
CN107608166A (zh) * 2016-07-12 2018-01-19 松下知识产权经营株式会社 光源装置以及投射型显示装置
CN207689821U (zh) * 2017-11-11 2018-08-03 深圳市中科创激光技术有限公司 一种激光显示光源

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11402733B2 (en) 2020-05-29 2022-08-02 Mega1 Company Ltd. Projecting apparatus

Similar Documents

Publication Publication Date Title
WO2020252933A1 (zh) 激光投影设备
US11237468B2 (en) Laser projection apparatus
US11079665B2 (en) Laser projection apparatus
CN111722464B (zh) 激光投影设备
CN112114475B (zh) 激光投影设备
US9249949B2 (en) Lighting device and projection-type display device using the same including a color-combining prism
WO2020253166A1 (zh) 激光光源和激光投影设备
US9551919B2 (en) Projection apparatus
CN112526806B (zh) 激光投影设备
US12078814B2 (en) Laser projector
JP6836132B2 (ja) 光学装置、光源装置、およびプロジェクター
WO2007099781A1 (ja) 発光モジュールとそれを用いた画像投影装置
WO2020253164A1 (zh) 激光投影设备
CN112114483B (zh) 激光投影设备
WO2020186843A1 (zh) 激光光源和激光投影设备
JP2015230354A (ja) 光源装置、およびプロジェクター
US20190212640A1 (en) Light source device and projection type display apparatus
CN112711165B (zh) 一种激光投影光源和激光投影设备
JP4815301B2 (ja) 光源モジュール及び投影型表示装置
US11454871B2 (en) Laser projection apparatus
WO2020253165A1 (zh) 激光光源和激光投影设备
JP2006235338A (ja) 投射型映像表示装置
CN116466533A (zh) 激光投影设备
WO2019111722A1 (ja) 光源装置、照明装置、およびプロジェクタ
US20240377649A1 (en) Laser projector

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19920338

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19920338

Country of ref document: EP

Kind code of ref document: A1