JP2015022255A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device allowing a simple configuration and downsizing, utilizing excitation light efficiently, and increasing luminance.SOLUTION: A first light source device 4 comprise: a light source 41 emitting excitation light of a first wavelength range; a phosphor layer 42 provided on a first light emission region serving as a part of a light emission region of the light source 41, and emitting light of a second wavelength range by irradiation of the excitation light; a wavelength selection element 44 transmitting the light of a second wavelength range therethrough and reflecting the excitation light; and a light condensing optical system 43 arranged on an optical path between the light source 41 and the wavelength selection element 44, transmitting therethrough the excitation light and the light of a second wavelength range, and guiding the excitation light so that at least part of the excitation light emitted from a second light emission region of the light emission region different from the first light emission region and reflected by the wavelength selection element 44 enters the phosphor layer 42.

Description

  The present invention relates to a light source device and a projector.

  2. Description of the Related Art Conventionally, a light source device that irradiates a phosphor layer with excitation light emitted from a light source such as a laser and uses illumination light as light emitted from the phosphor layer is known. In addition, this light source device is used in a projector having a light modulation device, and a technique that responds to the need for higher brightness has been proposed (for example, see Patent Document 1).

  A light source device (illumination device) described in Patent Literature 1 includes a first light source that emits main excitation light, a first light source device that has a fluorescent layer that converts main excitation light into fluorescence and emits the light, and sub-excitation light. A second light source device having a second light source to be emitted; and an excitation light reflection mirror disposed on the optical path of the first light source device and having an excitation light reflection portion and an excitation light passage portion. The secondary excitation light enters the fluorescent layer through the excitation light passage, and the fluorescent layer also converts the secondary excitation light into fluorescence and emits it.

JP 2011-128482 A

  However, the light source device described in Patent Document 1 is a second light source device that emits sub-excitation light to irradiate excitation light on the side opposite to the first light source of the fluorescent layer, a lens that guides sub-excitation light, excitation Due to the configuration including the light reflecting mirror, there are problems that the number of parts is increased and the apparatus is enlarged. In addition, since the excitation light reflecting mirror is provided with a region that transmits the excitation light in part in order to transmit the sub excitation light, there is a problem that a part of the excitation light from the first light source is not used effectively. is there.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A light source device according to this application example has a first light emitting region and a second light emitting region, a light source that emits excitation light in a first wavelength band, and the first light emitting region in plan view. And a phosphor layer that emits light in a second wavelength band different from the first wavelength band by irradiation with the first excitation light emitted from the first light emitting region, A wavelength selection element that transmits light in the second wavelength band and reflects light in the first wavelength band, and is disposed in an optical path between the light source and the wavelength selection element, and is emitted from the second light emitting region The second excitation light and the light emitted from the phosphor layer are transmitted, and at least a part of the second excitation light reflected by the wavelength selection element is incident on the phosphor layer. A condensing optical system for guiding the second excitation light.

According to this configuration, the first excitation light emitted from the first light emitting region of the light source is applied to the phosphor layer, and at least part of the second excitation light emitted from the second light emitting region of the light source is The light is reflected by the wavelength selection element, and is irradiated on the phosphor layer by the condensing optical system. That is, the phosphor layer is irradiated with excitation light from both the light source side and the opposite side of the light source. Accordingly, it is possible to irradiate excitation light on both sides of the phosphor layer without adopting a complicated structure for irradiating the phosphor layer with excitation light from the side opposite to the light source. This makes it possible to provide a light source device that efficiently emits light in the second wavelength band. Moreover, the increase in components can be suppressed.
In addition, since the light of the second wavelength band is emitted from a region having a small area as compared with the configuration in which the phosphor layer overlaps all the light emitting regions of the light source, the amount of light flux per unit area can be increased. .
Therefore, it is possible to emit light of the second wavelength band with high luminance, for example, white light, red light, green light, and the like by efficiently using the excitation light while achieving a simple configuration and downsizing. A light source device can be provided.

  Application Example 2 In the light source device according to the application example, the first light emitting area is provided in one area of the light emitting area of the light source, and the second light emitting area is provided in the remaining area of the light emitting area. It is preferable that

  According to this configuration, it is possible to efficiently guide the second excitation light emitted from the second light emitting region to the phosphor layer using a condensing optical system having a simple configuration. In addition, since the phosphor layer has a simple structure in which the phosphor layer is provided on one side of the light emitting region, it is possible to easily provide the phosphor layer at a desired position and further simplify the manufacture of the light source device.

  Application Example 3 In the light source device according to the application example described above, it is preferable that the phosphor layer is provided so as to include a region symmetrical to the second light emitting region with respect to the optical axis of the condensing optical system. preferable.

  According to this configuration, it is possible to irradiate the phosphor layer from the side opposite to the light source without wasting the second excitation light emitted from the second light emitting region. Therefore, a light source device capable of emitting light in the second wavelength band with higher brightness can be provided.

  Application Example 4 In the light source device according to the application example described above, it is preferable that the light source device includes a correction unit that corrects the traveling direction of the light in the second wavelength band emitted from the wavelength selection element.

Since the phosphor layer is provided in the first light emitting region which is a part of the light emitting region of the light source, the optical axis of the light emitted from the wavelength selection element is inclined with respect to the optical axis of the condensing optical system It becomes.
According to this configuration, since the light source device includes the correction unit, the tilt with respect to the optical axis can be corrected. As a result, the light source device can suppress the loss of light, and can efficiently irradiate the illumination target with light in the second wavelength band.

  Application Example 5 In the light source device according to the application example, the first light emitting area is provided in one area of the light emitting area of the light source, and the second light emitting area is provided in the remaining area of the light emitting area. Preferably, the correction unit has a wedge-like shape in which a side facing the phosphor layer is thicker than a side facing the second light emitting region.

  According to this configuration, since the light source device includes the wedge-shaped correction unit described above, the optical axis of the light emitted from the wavelength selection element can be corrected in the direction along the optical axis of the condensing optical system. . Further, since the correction portion has a simple shape such as a wedge shape, the manufacturing can be simplified.

  Application Example 6 In the light source device according to the application example described above, the first lens array having a plurality of first lenses arranged on the light emission side of the wavelength selection element and the light emission side of the first lens array. And a second lens array having a plurality of second lenses corresponding to the plurality of first lenses, wherein the first light emitting region is provided in a region on one side of the light emitting region of the light source, The two light emitting areas are provided in the remaining area of the light emitting area, the optical axis of each of the plurality of first lenses is decentered with respect to the optical axis of the corresponding second lens, and the first lens is It preferably corresponds to a correction unit.

  According to this configuration, since the light source device includes the first lens array and the second lens array, the in-plane light intensity distribution on the surface of the illumination target can be made substantially uniform. In addition, since the correction unit includes the first lens array, it is possible to correct the inclination of the optical axis of the light emitted from the wavelength selection element without increasing the number of components.

  Application Example 7 In the light source device according to the application example described above, it is preferable that the first light emission region and the second light emission region have a rectangular shape when viewed from a direction along the optical axis of the condensing optical system.

  According to this configuration, the light emitted from the light source device is irradiated in a rectangular shape on a surface orthogonal to the emitted light. Therefore, the light source device can efficiently illuminate the illumination target whose irradiation surface is rectangular.

  Application Example 8 In the light source device according to the application example described above, it is preferable that the first light emitting region and the second light emitting region have the same area in a plane orthogonal to the optical axis of the condensing optical system.

  According to this configuration, the phosphor layer can be effectively irradiated with the second excitation light emitted from the second light emitting region. Therefore, a light source device capable of emitting light of the second wavelength band with higher brightness can be achieved.

  Application Example 9 In the light source device according to the application example described above, it is preferable that the first light emission region and the second light emission region have similar shapes in a plane perpendicular to the optical axis of the condensing optical system. .

  According to this configuration, even if the distance between the second light emitting region and the phosphor layer with respect to the condensing optical system is different, the second excitation light emitted from the second light emitting region is efficiently irradiated onto the phosphor layer. Is possible. Therefore, it is possible to efficiently irradiate the phosphor layer with the second excitation light emitted from the second light emitting region while improving the degree of freedom of the arrangement position of the light source and the phosphor layer with respect to the condensing optical system. Become.

  Application Example 10 In the light source device according to the application example described above, it is preferable that the light in the second wavelength band is light in a wavelength band having at least one of yellow light, green light, and red light.

  According to this configuration, since the phosphor layer emits light having at least one of yellow light, green light, and red light, the light source device can emit color light emitted from the phosphor layer.

  Application Example 11 In the light source device according to the application example described above, it is preferable that the excitation light in the first wavelength band is light in a wavelength band having at least one of blue light, violet light, and ultraviolet light.

  According to this configuration, since the light source emits excitation light in a wavelength band having at least one of blue light, violet light, and ultraviolet light, the phosphor layer can emit light efficiently.

  Application Example 12 In the light source device according to the application example, it is preferable that the light source includes a light emitting diode or a semiconductor laser that emits the excitation light.

  According to this configuration, the light emitting diode is small in size and has high light emission efficiency, and the semiconductor laser emits light with high light condensing property, so that the phosphor layer can be made to emit light by improving the utilization efficiency of the excitation light. .

  Application Example 13 A projector according to this application example is modulated by the light source device described above, a light modulation device that modulates light emitted from the light source device according to image information, and the light modulation device. A projection lens for projecting light.

  According to this configuration, since the projector includes the light source device described above, it is possible to provide a projector that can be downsized and can project a bright image.

FIG. 2 is a schematic diagram illustrating an optical unit in the projector according to the first embodiment. The schematic diagram for demonstrating the 1st light source device of 1st Embodiment. The schematic diagram for demonstrating the advancing path | route of the 2nd excitation light inject | emitted from the 2nd light emission area | region in 1st Embodiment. The schematic diagram for demonstrating the function of the correction | amendment part in 1st Embodiment. The schematic diagram which shows the optical unit in the projector of 2nd Embodiment. The schematic diagram which shows the optical unit in the projector of 3rd Embodiment. The schematic diagram which shows the light source of the modification 1, and a fluorescent substance layer. The schematic diagram which shows the light source of the modification 2, and a fluorescent substance layer. FIG. 9 is a schematic diagram for explaining a correction unit according to Modification 3. FIG. 10 is a schematic diagram illustrating an optical unit in a projector according to Modification 4;

(First embodiment)
Hereinafter, the projector according to the first embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates light emitted from the light source device according to image information, and enlarges and projects the modulated light onto a projection surface such as a screen.

FIG. 1 is a schematic diagram showing an optical unit 3 in the projector 1 of the present embodiment.
As shown in FIG. 1, the projector 1 includes an optical unit 3 having a light source device 2, and a control unit, a power supply device, a cooling device, and an exterior housing that houses these devices, although not shown. ing.

The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and functions as a computer, and is related to control of the operation of the projector 1, for example, image projection. Control and so on.
The power supply device supplies power to the light source device 2 and the control unit.
The cooling device cools the light source device 2 and the power supply device.
Although detailed description is omitted, the exterior casing is composed of a plurality of members, and is provided with an intake port for taking in outside air, an exhaust port for exhausting warm air inside, and the like.

[Configuration of optical unit]
The optical unit 3 optically processes and projects the light emitted from the light source device 2 under the control of the control unit.
As shown in FIG. 1, in addition to the light source device 2, the optical unit 3 includes an integrator illumination optical system 32, dichroic mirrors 331 and 332, reflection mirrors 34B and 34G, field lenses 35B, 35G and 35R, and liquid crystal as a light modulation device. A light valve 361, a cross dichroic prism 362 as a color synthesizing optical device, and a projection lens 37 are provided.

  The liquid crystal light valve 361 includes a liquid crystal light valve 361R that modulates red light (hereinafter referred to as “R light”) according to image information, and a liquid crystal light valve that modulates green light (hereinafter referred to as “G light”) according to image information. 361G includes a liquid crystal light valve 361B that modulates blue light (hereinafter referred to as “B light”) according to image information.

Each liquid crystal light valve 361 includes a transmissive liquid crystal panel, an incident-side polarizing plate disposed on the light incident side of the liquid crystal panel, and an emission-side polarizing plate disposed on the light emission side of the liquid crystal panel.
The liquid crystal light valve 361 has a rectangular image forming area in which a plurality of micro pixels (not shown) are provided in a matrix. Each pixel is set to a light transmittance corresponding to the display image signal, and a display image is formed in the image forming area. Each color light is modulated by the liquid crystal light valve 361 and then emitted to the cross dichroic prism 362.

  The cross dichroic prism 362 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed at the interface where the right angle prisms are bonded together. In the cross dichroic prism 362, the dielectric multilayer film reflects the color light modulated by the liquid crystal light valves 361R and 351B, transmits the color light modulated by the liquid crystal light valve 361G, and synthesizes each color light.

  The projection lens 37 includes a plurality of lenses (not shown), and enlarges and projects the light combined by the cross dichroic prism 362 on the screen.

The light source device 2 includes a first light source device 4 and a second light source device 5.
The first light source device 4 includes a light source 41 having a light emitting diode, and a phosphor layer 42 applied to a part of the light emitting region of the light source 41. The phosphor layer 42 emits Y light including R light and G light by the excitation light emitted from the light source 41.
The second light source device 5 includes a light source 51 having a light emitting diode that emits B light and a collimating lens 52, and the B light emitted from the light source 51 is substantially collimated by the collimating lens 52 and emitted.
The configuration of the first light source device 4 will be described in detail later.

The integrator illumination optical system 32 includes a first integrator illumination optical system 321 corresponding to the first light source device 4 and a second integrator illumination optical system 322 corresponding to the second light source device 5.
The first integrator illumination optical system 321 includes a first lens array 3211, a second lens array 3212, a polarization conversion element 3213, and a superimposing lens 3214.
The first lens array 3211 has a plurality of first lenses, and divides the light emitted from the first light source device 4 into a plurality of partial lights. The second lens array 3212 is disposed on the light emission side of the first lens array 3211 and has a plurality of second lenses facing the first lens. The second lens array 3212 superimposes the partial light on the liquid crystal light valves 361G and 361R together with the superimposing lens 3214.
The polarization conversion element 3213 converts non-polarized light emitted from the second lens array 3212 into linearly polarized light.

Similar to the first integrator illumination optical system 321, the second integrator illumination optical system 322 includes a first lens array 3221, a second lens array 3222, a polarization conversion element 3223, and a superimposing lens 3224, from the second light source device 5. The emitted B light is divided into a plurality of partial lights and superimposed on the surface of a liquid crystal light valve 361B described later.
The B light emitted from the second integrator illumination optical system 322 is reflected by the reflection mirror 34B and enters the liquid crystal light valve 361B via the field lens 35B.

The dichroic mirror 331 reflects the G light used for image formation out of the Y light emitted from the first integrator illumination optical system 321 and transmits the remaining light.
The G light reflected by the dichroic mirror 331 is reflected by the reflecting mirror 34G and enters the liquid crystal light valve 361G via the field lens 35G.
The dichroic mirror 332 reflects R light used for image formation out of the light transmitted through the dichroic mirror 331 and transmits unnecessary light. Then, the R light reflected by the dichroic mirror 332 enters the liquid crystal light valve 361R via the field lens 35R.

[Configuration of First Light Source Device]
Here, the first light source device 4 will be described in detail.
2A and 2B are schematic diagrams for explaining the first light source device 4. FIG. 2A is a diagram showing the configuration of the first light source device 4, and FIG. 2B shows the light source 41 in the first light source device 4 emitting light. It is the top view seen from the side.

As shown in FIG. 2A, the first light source device 4 includes a condensing optical system 43, a wavelength selection element 44, and a correction unit 45 in addition to the light source 41 and the phosphor layer 42. The condensing optical system 43 is provided in the optical path between the light source 41 and the wavelength selection element 44.
The light source 41 emits excitation light in the first wavelength band. In the present embodiment, a light-emitting diode that emits light in a wavelength band having blue light as the first wavelength band is used. The excitation light in the first wavelength band is not limited to blue light, and light in a wavelength band having violet light or ultraviolet light may be used.

As shown in FIG. 2B, the light source 41 includes a rectangular light emitting region 41A. The light emitting area 41 </ b> A has a first light emitting area 411 and a second light emitting area 412. The first light emitting area 411 is provided in a substantially half area on one side of the light emitting area 41A, and the second light emitting area 412 is provided in the remaining area of the light emitting area 41A. In this specification, for the sake of convenience, the excitation light emitted from the first light emitting region 411 is referred to as first excitation light, and the excitation light emitted from the second light emitting region 412 is referred to as second excitation light.
The light source 41 and the condensing optical system 43 are arranged so that the optical axis 43C of the condensing optical system 43 is positioned at the approximate center of the light emitting region 41A. Further, the phosphor layer 42 is provided so as to overlap the first light emitting region 411 in plan view. Specifically, in FIG. 2B, the phosphor layer 42 is provided on one side of the light emitting region with a straight line extending in the vertical direction passing through the optical axis 43C as a boundary. In other words, in the light emitting region 41A, the region where the phosphor layer 42 is provided is the first light emitting region 411, and the region where the phosphor layer 42 is not provided is the second light emitting region 412.

The 1st light emission area | region 411 and the 2nd light emission area | region 412 are each rectangular shapes, and both area is substantially equal. The first light emitting region 411 and the second light emitting region 412 are preferably symmetrical with respect to the optical axis 43C. The reason for this will be described later with reference to FIG.
Note that the shape of each lens included in the first lens array 3211 and the second lens array 3212 is similar to the shape of the image forming area of the liquid crystal light valve 361. The rectangular first light emitting region 411 (phosphor layer 42) is set in the longitudinal direction (short direction) so as to correspond to the half shape of each lens.

The phosphor layer 42 is formed of a material containing, for example, a cerium activated YAG (Yttrium Aluminum Garnet) phosphor (YAG: Ce3 +), and is applied to the light emission side of the light source 41.
The phosphor layer 42 emits Y light including R light and G light by excitation light from the light source 41. The Y light corresponds to light in a second wavelength band different from the first wavelength band.

  As shown in FIG. 2A, the condensing optical system 43 includes lenses 431 and 432, and the light emitted from the phosphor layer 42 provided in the first light emitting region 411, and the second The second excitation light emitted from the light emitting region 412 is made substantially parallel and transmitted.

The wavelength selection element 44 transmits light in the second wavelength band and reflects light in the first wavelength band. In other words, the wavelength selection element 44 is disposed on the light emission side of the condensing optical system 43, transmits the Y light emitted from the phosphor layer 42, and emits the second excitation light 41 a emitted from the second light emitting region 412. To reflect.
The Y light transmitted through the wavelength selection element 44 enters the correction unit 45. Then, at least a part of the second excitation light 41 b emitted from the second light emitting region 412 and reflected by the wavelength selection element 44 enters the phosphor layer 42 via the condensing optical system 43. That is, the condensing optical system 43 is configured so that at least a part of the second excitation light 41 b emitted from the second light emitting region 412 of the light source 41 and reflected by the wavelength selection element 44 is incident on the phosphor layer 42. And has a function of guiding the second excitation light.

FIG. 3 is a schematic diagram for explaining a traveling path of the second excitation light 41 a emitted from the second light emitting region 412.
As shown in FIG. 3, the second excitation light 41a emitted from the second light emitting region 412 travels so as to spread toward the condensing optical system 43, and is substantially collimated by lenses 431 and 432 to select the wavelength. Incident on the element 44. Then, the second excitation light 41 a is reflected by the wavelength selection element 44. At least a part of the second excitation light 41b reflected by the wavelength selection element 44 is irradiated with a region whose traveling direction is changed by the lenses 432 and 431 and which is symmetrical to the second light emitting region 412 with respect to the optical axis 43C. To do. Therefore, the first light emitting region 411 provided with the phosphor layer 42 is preferably axially symmetric with the second light emitting region 412 with respect to the optical axis 43C.

As described above, the second excitation light emitted from the second light emitting region 412 of the light source 41 is incident on the phosphor layer 42 provided at a position symmetric with respect to the optical axis 43C. The phosphor layer 42 emits Y light when the second excitation light is incident thereon.
That is, the phosphor layer 42 is emitted from the first light emitting region 411 and emitted from the first excitation light incident from the light source 41 side and the second light emitting region 412, and the condensing optical system 43 and the wavelength selecting element 44 are And Y light is emitted by the second excitation light incident from the side opposite to the light source 41. Then, the Y light passes through the wavelength selection element 44.

By the way, since the phosphor layer 42 is provided on one side with respect to the optical axis 43C, the light emitted from the wavelength selection element 44 proceeds while being inclined with respect to the optical axis 43C.
The correction unit 45 has a function of correcting the inclination of the traveling direction (optical axis) of the light emitted from the wavelength selection element 44.
4A and 4B are schematic diagrams for explaining the function of the correction unit 45. FIG. 4A is a diagram when the correction unit 45 is not arranged, and FIG. 4B is a diagram when the correction unit 45 is arranged. FIG.

  As shown in FIG. 4A, when the correction unit 45 is not disposed, the light emitted from the phosphor layer 42 and transmitted through the condensing optical system 43 and the wavelength selection element 44 is relative to the optical axis 43C. It proceeds toward the side opposite to the side where the phosphor layer 42 is provided.

As shown in FIG. 4B, the correction unit 45 has a wedge-like shape in which the side facing the phosphor layer 42 is thicker than the side facing the second light emitting region 412, and the light emission of the wavelength selection element 44 is performed. Placed on the side.
When the correction unit 45 is disposed, the light emitted from the phosphor layer 42 and transmitted through the condensing optical system 43 and the wavelength selection element 44 is corrected in the traveling direction by the correction unit 45, and is approximately aligned with the optical axis 43C. Proceed along.

Thus, the phosphor layer 42 is an approximately half region of the light emitting region 41A of the light source 41 and is provided on one side of the optical axis 43C in plan view. The phosphor layer 42 has both sides (the light source 41 side, Excitation light is irradiated from the side opposite to the light source 41). And the 1st light source device 4 correct | amends the advancing direction of the light emitted from the fluorescent substance layer 42, and which inclines with respect to the optical axis 43C after passing the wavelength selection element 44, correct | amends it, and inject | emits. .
As described above, the light emitted from the first light source device 4 is separated into the G light and the R light by the dichroic mirrors 331 and 332, and the G light and the R light are modulated by the liquid crystal light valves 361G and 361R, respectively. . The modulated G light and R light are emitted from the second light source device 5, synthesized with the B light modulated by the liquid crystal light valve 361 B, and projected by the projection lens 37.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Excitation light emitted from the light source 41 can be irradiated on both sides of the phosphor layer 42 (on the side of the light source 41 and on the side opposite to the light source 41) without making the first light source device 4 have a complicated structure. Moreover, the increase in components can be suppressed.
In addition, since the phosphor layer 42 is provided so as to overlap all the light emitting regions of the light source 41 (the first light emitting region 411 and the second light emitting region 412), light can be emitted from a small area. The amount of light flux per unit area of the first light source device 4 can be increased.
Accordingly, it is possible to provide the first light source device 4 capable of emitting a high-intensity Y light by efficiently using the excitation light while achieving a simple configuration and downsizing. In addition, the projector 1 equipped with the first light source device 4 is small and can project a bright image.

  (2) Since the phosphor layer 42 is provided on one side of the light emitting region of the light source 41, a configuration in which the second excitation light emitted from the second light emitting region 412 is efficiently guided to the phosphor layer 42, that is, The configuration of the condensing optical system 43 can be simplified. In addition, since the phosphor layer 42 has a simple structure in which the phosphor layer 42 overlaps one side of the light emitting region, the phosphor layer 42 can be easily provided at a desired position, and the first light source device 4 can be further simplified.

  (3) Since the phosphor layer 42 is provided in the first light emitting region 411 symmetrical to the second light emitting region 412 with respect to the optical axis 43C, the second excitation light emitted from the second light emitting region 412 is emitted. It is possible to irradiate the phosphor layer 42 from the side opposite to the light source without waste. Therefore, the 1st light source device 4 which can inject | emit the Y light of still higher brightness can be aimed at.

(4) Since the first light source device 4 includes the correction unit 45, the inclination of the optical axis of the emitted light with respect to the optical axis 43C can be corrected. As a result, the first light source device 4 can suppress the loss of light, and can efficiently irradiate the liquid crystal light valves 361R and 361G to be illuminated with R light and G light.
Moreover, since the correction | amendment part 45 is a simple shape called wedge shape, manufacture can be simplified.

  (5) Since the first light emitting region 411 and the second light emitting region 412 are rectangular when viewed from the direction along the optical axis 43C, the illumination target can efficiently illuminate the image forming region of the liquid crystal light valve 361 having a rectangular shape. it can.

  (6) Since the first light source device 4 emits Y light including R light and G light with a single light source 41, the first light source device 4 has a first light source 41 as compared with the configuration in which the light sources 41 are individually provided corresponding to the R light and G light. It is possible to reduce the size of the light source device 4 and thus the projector 1.

  (7) Since the light source 41 includes a light emitting diode that is small and has high light emission efficiency, the light emitted from the light emitting diode is used as excitation light. Therefore, the first light source device 4 can be further miniaturized and the utilization efficiency of the excitation light can be increased. And the phosphor layer 42 can emit light.

(Second Embodiment)
Hereinafter, a projector according to a second embodiment will be described with reference to the drawings. In the following description, the same configurations and similar members as those of the projector 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
FIG. 5 is a schematic diagram showing the optical unit 13 in the projector according to the present embodiment.
As shown in FIG. 5, the projector according to the present embodiment includes a first light source device 6 having a configuration different from that of the first light source device 4 in the projector 1 according to the first embodiment.

Whereas the first light source device 4 of the first embodiment is configured to include one light source 41, the first light source device 6 of the present embodiment includes a light source 41 for R light and a light source for G light. 41 is provided. The light source 41 emits excitation light that is light in the first wavelength band.
The first light source device 6 of the present embodiment includes an R system light source unit 61R having a light source 41 for R light, a G system light source unit 61G having a light source 41 for G light, a dichroic mirror 63, and a correction unit 64. Yes.

In addition to the light source 41, the R-system light source unit 61R includes a phosphor layer 62R, a condensing optical system 43, and a wavelength selection element 44.
The phosphor layer 62 </ b> R emits R light by the excitation light from the light source 41. The R light corresponds to light in the second wavelength band.
As shown in FIG. 5, the phosphor layer 62 </ b> R is provided in substantially half of the light emitting region of the light source 41, similarly to the phosphor layer 42 in the first embodiment. Specifically, the phosphor layer 62R is formed of a red phosphor (for example, a material containing CaAlSiN ₃ —Si ₂ N ₂ O: Eu). The phosphor layer 62R is applied to one side of the light emitting region of the light source 41 with respect to the optical axis 43Cr of the condensing optical system 43 in the R system light source unit 61R.
Excitation light emitted from the light source 41 is irradiated on both sides of the phosphor layer 62R by the condensing optical system 43 and the wavelength selection element 44 and converted into R light, as described in the first embodiment. The light is emitted from the element 44 to the dichroic mirror 63.

In addition to the light source 41, the G light source unit 61G includes a phosphor layer 62G, a condensing optical system 43, and a wavelength selection element 44.
The phosphor layer 62G emits G light by the excitation light from the light source 41. The G light corresponds to light in the second wavelength band.
As shown in FIG. 5, the phosphor layer 62G is provided in substantially half of the light emitting region of the light source 41 in the same manner as the phosphor layer 62R in the R-system light source 61R. Specifically, the phosphor layer 62G is formed of a green phosphor (for example, a material containing Ba ₃ Si ₆ O ₁₂ N ₂ : Eu). The phosphor layer 62G is applied to one side of the light emitting region of the light source 41 with respect to the optical axis 43Cg of the condensing optical system 43 in the G system light source 61G.
Excitation light emitted from the light source 41 is irradiated on both sides of the phosphor layer 62G by the condensing optical system 43 and the wavelength selection element 44 and converted into G light, as described in the first embodiment, and wavelength selection is performed. The light is emitted from the element 44 to the dichroic mirror 63.

  As shown in FIG. 5, the R light source 61R and the G light source 61G are arranged so that the optical axis 43Cr and the optical axis 43Cg are substantially orthogonal to each other. 5, the phosphor layer 62R is provided on the upper side of the optical axis 43Cr, and the phosphor layer 62G is provided on the right side of the optical axis 43Cg.

The dichroic mirror 63 is provided at a position where the optical axis 43Cr and the optical axis 43Cg intersect. The dichroic mirror 63 reflects the R light toward the first integrator illumination optical system 321 and transmits the G light toward the first integrator illumination optical system 321 at approximately 45 ° with respect to the optical axes 43Cr and 43Cg. It is arrange | positioned so that it may have an angle.
The dichroic mirror 63 combines the R light emitted from the R light source unit 61R and the G light emitted from the G light source unit 61G, and emits the combined light to the correction unit 64.

As shown in FIG. 5, the correction unit 64 has a wedge-shaped cross section and is disposed on the light emission side of the dichroic mirror 63 on the optical axis 43 </ b> Cg, similarly to the correction unit 45 of the first embodiment. The correction unit 64 is arranged so that the thicker side faces the phosphor layer 62G. The correction unit 64 is arranged with respect to the phosphor layer 62R so that the thicker side becomes the phosphor layer 62R side through the dichroic mirror 63 that reflects R light.
As described in the first embodiment, the traveling direction of the R light and the traveling direction of the G light emitted from the dichroic mirror 63 are corrected by the correction unit 64, and the first integrator illumination optical system 321 includes the first direction. Incidently perpendicular to the lens array 3211.
As described in the first embodiment, the light emitted from the first integrator illumination optical system 321 is separated into G light and R light, and enters the liquid crystal light valves 361G and 361R, respectively.

As described above, according to the projector of the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment.
Since the first light source device 6 includes an R-system light source unit 61R that emits R light and a G-system light source unit 61G that emits G light, the brightness of the R light and the brightness of the G light can be controlled independently. Can do. Therefore, the white balance of the image can be easily adjusted.

(Third embodiment)
Hereinafter, a projector according to a third embodiment will be described with reference to the drawings. In the following description, the same configurations and similar members as those of the projectors of the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.

FIG. 6 is a schematic diagram showing the optical unit 23 in the projector of the present embodiment.
The projector according to the first embodiment includes a first light source device 4 that emits Y light, and the projector according to the second embodiment includes a first light source device 6 that emits R light and G light. As shown in FIG. 6, the projector includes a light source device 7 that emits light having R light, G light, and B light.
In addition, the projector of this embodiment includes an integrator illumination optical system 81, a color separation optical system 82, and a relay optical system 83 that are different from the optical systems of the first and second embodiments.

The light source device 7 includes an R-system light source unit 61R and a G-system light source unit 61G in the second embodiment, a second light source device 5 in the first embodiment, correction units 71R and 71G, and a cross dichroic prism 72. Yes.
The correction unit 71R is disposed on the light emission side of the R-system light source unit 61R, corrects the inclination of the optical axis of the R light emitted from the R-system light source unit 61R, and emits the light toward the cross dichroic prism 72. The correction unit 71G is disposed on the light emission side of the G-system light source unit 61G, corrects the inclination of the optical axis of the G light emitted from the G-system light source unit 61G, and emits the light toward the cross dichroic prism 72.
The second light source device 5 is arranged to face the R-system light source unit 61R via the cross dichroic prism 72, and emits B light toward the cross dichroic prism 72.

  The cross dichroic prism 72 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. The cross dichroic prism 72 reflects the R light emitted from the R light source unit 61R and the B light emitted from the second light source device 5, and the G light emitted from the G light source unit 61G. Then, R light, G light, and B light are combined, and the combined light is emitted toward the integrator illumination optical system 81.

  The integrator illumination optical system 81 includes the first integrator illumination optical system 321 in the first embodiment. Then, the integrator illumination optical system 81 converts the incident light so that the in-plane light intensity distribution of the illumination light on the surface of each liquid crystal light valve 361 becomes uniform.

The color separation optical system 82 includes dichroic mirrors 821 and 822 and a reflection mirror 823, and separates light emitted from the integrator illumination optical system 81 into three color lights of B light, R light, and G light. Specifically, the dichroic mirror 821 reflects B light among light emitted from the integrator illumination optical system 81 and transmits G light and R light. The dichroic mirror 822 reflects the G light and transmits the R light out of the G light and R light transmitted through the dichroic mirror 821.
The B light reflected by the dichroic mirror 821 is reflected by the reflection mirror 823 and enters the liquid crystal light valve 361B via the field lens 35B. The G light reflected by the dichroic mirror 822 enters the liquid crystal light valve 361G via the field lens 35G.

The relay optical system 83 includes an incident side lens 831, a relay lens 832, and reflecting mirrors 833 and 834, and guides the R light separated by the color separation optical system 82 to the field lens 35R. The R light incident on the field lens 35R enters the liquid crystal light valve 361R. The color separation optical system 82 and the relay optical system 83 are configured such that the relay optical system 83 guides the R light. However, the configuration is not limited thereto, and, for example, a configuration that guides the B light may be used.
Each color light incident on the liquid crystal light valves 361B, 361G, and 361R is modulated according to image information, synthesized by the cross dichroic prism 362, and projected from the projection lens 37, as described in the first embodiment. The

As described above, according to the projector of this embodiment, the following effects can be obtained in addition to the effects of the first embodiment and the second embodiment.
In the first embodiment and the second embodiment, the first integrator illumination optical system 321 and the second integrator illumination optical system 322 are necessary, but in the present embodiment, the second integrator illumination optical system 322 is unnecessary. Therefore, the optical unit 23 can be downsized, and thus the projector can be downsized.

In addition, you may change the said embodiment as follows.
(Modification 1)
In the above-described embodiment, the phosphor layer 42 is applied to the integrally formed light source 41. For example, as shown in FIG. 7, the light source is composed of two separate light emitting elements. You may comprise so that a fluorescent substance layer may be apply | coated to one light emitting element among the light emitting elements.

FIG. 7 is a schematic diagram showing the light source 10 and the phosphor layer 20 of Modification 1. FIGS. 7A and 7B are diagrams in the case where the positions where the plurality of light emitting elements are arranged are changed.
As illustrated in FIG. 7, the light source 10 includes two light emitting elements 10 a and 10 b, and the light emitting elements 10 a and 10 b are provided on the substrate 200. The substrate 200 has a reference surface 200a orthogonal to the optical axis 43C.

The light emitting elements 10a and 10b are formed so that the shape and area of the light emitting region are equal to each other. The phosphor layer 20 is applied to the light emitting region of the light emitting element 10a.
The light emitting element 10 a and the light emitting element 10 b are arranged with the optical axis 43 </ b> C interposed therebetween, and the phosphor layer 20 is provided on one side of the light source 10.

In the light source 10 shown in FIG. 7A, the height of the light emitting surface 10as of the light emitting element 10a from the reference surface 200a is equal to the height of the light emitting surface 10bs of the light emitting element 10b from the reference surface 200a. On the other hand, in the light source 10 shown in FIG. 7B, the height of the light emitting surface 10bs of the light emitting element 10b from the reference surface 200a is equal to the height of the light incident surface 20s of the phosphor layer 20 from the reference surface 200a.
As shown in FIG. 7B, by arranging the light emitting elements 10a and 10b, the second light emitted from the light emitting element 10b and guided to the phosphor layer 20 through the condensing optical system 43 and the wavelength selecting element 44. It becomes possible to irradiate the phosphor layer 20 more efficiently. Further, the light source 10 is not limited to two and may be composed of three or more light emitting elements.

(Modification 2)
In the embodiment, the phosphor layer 42 is applied to the light source 41, but may be configured to be provided on a transparent member separate from the light source 41.
FIG. 8 is a schematic diagram showing the light source 30 and the phosphor layer 40 of the second modification.
The phosphor layer 40 is applied to a plate-like transparent member 50 having an area approximately half the area of the light emitting region of the light source 30, and is disposed on one side of the optical axis 43C, that is, one side of the light emitting region of the light source 30. .

(Modification 3)
In the embodiment, the correction units 45, 64, 71R, and 71G having a wedge-shaped cross section are used as the correction unit. However, the present invention is not limited to this configuration. For example, the first lens array 3211 has a function of the correction unit. You may comprise so that it may be included.
FIG. 9 is a schematic diagram for explaining a correction unit according to Modification 3. FIG. 9A is a diagram illustrating a first lens array 3211 that does not include the function of the correction unit, and FIG. 9B is a diagram illustrating the correction unit. It is a figure which shows the 1st lens array 90 incorporating the function.
The first lens array 3211 has a plurality of first lenses 3211a, and the first lens array 90 has a plurality of first lenses 90a. FIG. 9 is a diagram illustrating one of the first lenses 3211a and 90a in order to clearly explain the first lenses 3211a and 90a.

  The optical axis of the first lens 90a of the first lens array 90 is lower than the optical axis of the first lens 3211a of the first lens array 3211, that is, with respect to the optical axis 43C, as viewed in FIG. It is eccentric to the side where it is formed. Although not shown, the optical axis of the first lens 90a is also decentered with respect to the optical axis of the second lens of the second lens array 3212 to which the first lens 90a corresponds.

  As shown in FIG. 9A, when the first lens array 3211 that does not include the function of the correction unit is used, the first lens array 3211 is emitted from the phosphor layer 42, and the condensing optical system 43, the wavelength selection element 44, and the first The light transmitted through the lens array 3211 travels toward the side opposite to the side where the phosphor layer 42 is provided with respect to the optical axis 43C.

On the other hand, as shown in FIG. 9B, when the first lens array 90 incorporating the function of the correction unit is used, the first lens array 90 is emitted from the phosphor layer 42, and the condensing optical system 43, the wavelength selection element 44, and The optical axis of the light transmitted through the first lens array 90 is corrected.
As described above, the first lens 90a of the first lens array 90 has a function of a correction unit, and the correction unit is provided in the first lens array 90, so that the wavelength selection element 44 does not increase the number of parts. The inclination of the optical axis of the emitted light can be corrected.

(Modification 4)
The projector of the embodiment uses a liquid crystal panel as the light modulation device, but may use a micromirror type light modulation device such as a DMD (Digital Micromirror Device) as the light modulation device.
FIG. 10 is a schematic diagram illustrating the optical unit 100 in the projector according to the fourth modification.
The optical unit 100 includes a light source device 7, a superimposing lens 101, a rod integrator 102, a condensing optical system 103, a reflecting mirror 104, a micromirror device 105 as a light modulation device, and a projection lens 106 according to the third embodiment.
The light source device 7 emits R light, G light, and B light in time division according to image information.
The light emitted from the light source device 7 is guided to the incident surface of the rod integrator 102 by the superimposing lens 101, and is uniformed by multiple reflection on the inner surface of the rod integrator 102, and is emitted from the emission surface.
The light emitted from the rod integrator 102 is made substantially parallel by the condensing optical system 103, reflected by the reflection mirror 104, and emitted to the micromirror device 105.
The light incident on the micromirror device 105 is reflected by the micromirror corresponding to each pixel according to the image information, thereby being modulated into light representing the image and projected from the projection lens 106.
As described above, the light source device 7 in which the phosphor layers 62R and 62G are provided in a part of the light emitting region of the light source 41 can also be used for a light source device of a projector including a micromirror type light modulation device. The same effects as described in the embodiment are obtained.
In the modification 4, the light source device 7 according to the third embodiment has been described. However, the light source device 2 according to the first embodiment and the light source devices according to the second embodiment (the first light source device 6 and the second light source device). It is also possible to use 5) for a projector including a micromirror type light modulation device.

(Modification 5)
The projector 1 of the embodiment uses a transmissive liquid crystal panel as a light modulation device, but may use a reflective liquid crystal panel.

(Modification 6)
In the above-described embodiment, a light emitting diode is used as the light source 41. However, the present invention is not limited to this. For example, a semiconductor laser, an organic EL (Electro Luminescence) element, a UV lamp, or the like may be used.

(Modification 7)
In the light source 41 of the embodiment, the light emitting region is formed in a rectangular shape, but is not limited to a rectangular shape, and may have another shape, for example, a circle or an ellipse.

(Modification 8)
The phosphor layer 42 of the embodiment is formed in the first light emitting region 411 that is symmetric to the second light emitting region 412 with respect to the optical axis 43C, but symmetry is not essential. In short, the phosphor layer 42 may be provided so as to include a region symmetric to the second light emitting region 412 with respect to the optical axis 43C. It is only necessary that the phosphor layer 42 be provided on the optical path of the second excitation light emitted from the second light emitting region 412 and reflected by the wavelength selection element 44.
Further, the first light emitting region 411 and the second light emitting region 412 may be formed so that the shapes in a plane orthogonal to the optical axis 43C are similar.
According to this configuration, even if the distance between the second light emitting region 412 and the phosphor layer 42 with respect to the condensing optical system 43 is different, the second excitation light emitted from the second light emitting region 412 can be efficiently emitted from the phosphor layer. 42 can be led. Therefore, the phosphor layer 42 is efficiently irradiated with the second excitation light emitted from the second light emitting region 412 while improving the degree of freedom of the arrangement positions of the light source 41 and the phosphor layer 42 with respect to the condensing optical system 43. It becomes possible to do.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2, 7 ... Light source device, 3, 13, 23, 100 ... Optical unit, 4, 6 ... 1st light source device, 5 ... 2nd light source device 10, 30, 41, 51 ... Light source, 10a ... Small light source, 10b ... small light source, 20, 40, 42, 62G, 62R ... phosphor layer, 37 ... projection lens, 41a, 41b ... second excitation light, 43 ... condensing optical system, 43C, 43Cg, 43Cr ... Optical axis 44 ... Wavelength selection element 45, 64, 71R, 71G ... Correction unit 90 ... First lens array 90a ... First lens 105 ... Micromirror device 361, 361B, 361G, 361R ... Liquid crystal light valve 411 ... 1st light emission area | region, 412 ... 2nd light emission area | region.

Claims (13)

A light source having a first light-emitting region and a second light-emitting region and emitting excitation light in a first wavelength band;
It is provided so as to overlap with the first light emitting region in plan view, and emits light of a second wavelength band different from the first wavelength band by irradiation of the first excitation light emitted from the first light emitting region. A phosphor layer that emits;
A wavelength selection element that transmits light in the second wavelength band and reflects light in the first wavelength band;
It is disposed in the optical path between the light source and the wavelength selection element, transmits the second excitation light emitted from the second light emitting region and the light emitted from the phosphor layer, and passes through the wavelength selection element. A condensing optical system for guiding the second excitation light so that at least a part of the second excitation light reflected by the light enters the phosphor layer;
A light source device comprising: The light source device according to claim 1,
The first light emitting region is provided in a region on one side of the light emitting region of the light source,
The second light emitting area is provided in the remaining area of the light emitting area. The light source device according to claim 1 or 2,
The light source device, wherein the phosphor layer is provided so as to include a region symmetrical to the second light emitting region with respect to an optical axis of the condensing optical system. The light source device according to any one of claims 1 to 3,
A light source apparatus comprising: a correction unit that corrects a traveling direction of light in the second wavelength band emitted from the wavelength selection element. The light source device according to claim 4,
The first light emitting region is provided in a region on one side of the light emitting region of the light source,
The second light emitting region is provided in the remaining region of the light emitting region,
The light source device according to claim 1, wherein the correction unit has a wedge-like shape in which a side facing the phosphor layer is thicker than a side facing the second light emitting region. The light source device according to claim 4,
A first lens array disposed on the light exit side of the wavelength selection element and having a plurality of first lenses;
A second lens array disposed on the light exit side of the first lens array and having a plurality of second lenses corresponding to the plurality of first lenses;
Further comprising
The first light emitting region is provided in a region on one side of the light emitting region of the light source,
The second light emitting region is provided in the remaining region of the light emitting region,
The optical axis of each of the plurality of first lenses is decentered with respect to the optical axis of the corresponding second lens,
The light source device, wherein the first lens corresponds to the correction unit. It is a light source device as described in any one of Claims 1-6, Comprising:
The light source device, wherein the first light emitting region and the second light emitting region are rectangular when viewed from a direction along an optical axis of the condensing optical system. It is a light source device as described in any one of Claims 1-7, Comprising:
The light source device characterized in that the first light emitting region and the second light emitting region have the same area in a plane perpendicular to the optical axis of the condensing optical system. It is a light source device as described in any one of Claims 1-8, Comprising:
The light source device, wherein the first light emitting region and the second light emitting region are similar in shape in a plane perpendicular to the optical axis of the condensing optical system. The light source device according to any one of claims 1 to 9,
The light source device according to claim 2, wherein the light in the second wavelength band is light in a wavelength band having at least one of yellow light, green light, and red light. The light source device according to any one of claims 1 to 10,
The excitation light in the first wavelength band is light in a wavelength band having at least one of blue light, violet light, and ultraviolet light. It is a light source device as described in any one of Claims 1-11, Comprising:
The light source includes a light emitting diode or a semiconductor laser that emits the excitation light. The light source device according to any one of claims 1 to 12,
A light modulation device that modulates light emitted from the light source device according to image information;
A projection lens for projecting light modulated by the light modulation device;
A projector comprising:

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