JP2008145510A - Light source unit and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source unit capable of efficiently synthesizing the light emitted from a plurality of bright spots and a projector equipped with the light source unit. <P>SOLUTION: The projector is equipped with the light source unit 80, a light guide apparatus 81 and a light source side optical system, a display element, a projection side optical system and a projector control means. The light source unit 80 has three pieces of the monochromatic light source devices 61 (61R, 61G, 61B) varying in light emission colors and two sets of light source sets 66 consisting of an optical axis synthesizing unit 65 which align the optical axis of the exit light of each of the monochromatic light source devices 61. Each of the light source sets 66 is arranged by intersecting the optical axes (d) of the exit light of each of the a light source sets 66 near the incident face of the light guide apparatus 81 and symmetrically with the perpendicular surface passing the optical axis X of the light guide apparatus 81. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source unit and a projector that projects an image based on a video signal or the like provided with the light source unit.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called DMD or a liquid crystal plate, and displays a color image on a screen.

  In such projectors, a projector using a high-intensity discharge lamp as a light source has been mainly used in the past. However, in recent years, development has been made to use red, green, and blue light-emitting diodes as light sources. A number of inventions have been made on projectors using the.

  However, since the light emitting diode alone has a small amount of light compared to the discharge lamp, it is necessary to use a plurality of light emitting diodes in order to serve as a light source for the projector. Thus, there is a problem of how to efficiently combine light emitted from a plurality of bright spots.

In order to deal with such a problem, in Japanese Patent Laid-Open No. 2006-208894 (Cited Document 1), three light sources in which a plurality of light emitting diodes are arranged in an array are arranged on three sides of a cross dichroic mirror, and the cross dichroic mirror By arranging a vertically long and truncated pyramidal rod integrator on the optical axis of the emitted light bundle, the light emitted from a plurality of bright spots is synthesized.
JP 2006-208894 A

  Since a single light emitting diode has a small amount of light, it is necessary to use a plurality of light emitting diodes in order to use a light emitting diode as a light emitting means of a projector. However, if a plurality of light emitting diodes are used, there will be a plurality of bright spots. It is difficult to efficiently synthesize light emitted from the bright spots.

  In addition, in the case of a light source unit in which monochromatic light source devices are arranged on three sides of a cross dichroic mirror, it is necessary to arrange a plurality of cross dichroic mirrors having monochromatic light source devices arranged on three sides in order to increase the amount of light. Since the light source device is arranged, in order to avoid physical buffering, it is necessary to arrange the exit surface of the cross dichroic mirror apart, and since the angle of the light bundle incident on the light guide device becomes large, the diffused light A lot of light that becomes unnecessary light was generated.

  The present invention has been made in view of the above-described problems of the prior art, and provides a light source unit capable of efficiently combining light emitted from a plurality of bright spots and a projector including the light source unit. The purpose is that.

  The light source unit of the present invention includes two sets of light sources each including three single-color light source devices having different emission colors and an optical axis synthesis unit that matches the optical axes of the emitted light of the single-color light source devices. The set has two monochromatic light source devices arranged in the same direction with respect to the optical axis of the emitted light of each light source set, and is arranged symmetrically with the optical axes of the emitted light of each light source set intersecting. It is characterized by.

  The first monochromatic light source device is disposed on the optical axis of the emitted light of each light source set, and the second monochromatic light source device and the third monochromatic light source device are the optical axes of the emitted light of the respective light source sets. It is characterized by being arranged as a direction orthogonal to.

  Each monochromatic light source device is formed by a light emitting means and a light guiding means for guiding the light emitted from the light emitting means to the optical axis combining unit.

  Further, the light emitting means of the three monochromatic light source devices in the light source set are a red light emitting diode, a green light emitting diode, and a blue light emitting diode, respectively.

  In addition, each light guide means in each monochromatic light source device has a truncated pyramid shape, and is formed such that the area of the optical axis combining unit side end portion is larger than the light emitting means side end portion. .

  The three monochromatic light source devices in the light source set are laser light emitting devices whose light emitting means are red, green, and blue, respectively, and may have a diffusing lens as the light guiding means.

  Each of the optical axis combining units is characterized in that two dichroic reflecting surfaces are arranged in the front-rear direction on the optical axis of the light emitted from the light source set.

  The projector of the present invention includes a light source unit, a light guide device and a light source side optical system, a display element, a projection side optical system, and a projector control means. The light source unit includes three light emitting units having different emission colors. And two sets of light source sets composed of optical axis combining units that match the optical axes of the emitted light of the respective monochrome light source devices, and each light source set has the optical axis of the emitted light of each of the light source sets as described above. The light guide device is arranged symmetrically with respect to a vertical plane passing through the optical axis of the light guide device by intersecting in the vicinity of the incident surface of the light guide device.

  Further, a plurality of the light source units are stacked in the vertical direction.

  ADVANTAGE OF THE INVENTION According to this invention, the light source unit which can synthesize | combine the light inject | emitted from several luminescent spots efficiently, and a projector provided with the said light source unit can be provided.

  The projector 1 in the best mode for carrying out the present invention includes a light source unit 80, a light guide device 81, a light source side optical system 70, a display element 51, a projection side optical system 90, and a projector control means 101. It is to be prepared.

  Further, the light source unit 80 is a light source set including three monochromatic light source devices 61 (61R, 61G, 61B) having different emission colors and an optical axis synthesizing unit 65 for matching the optical axes of the emitted lights of the monochromatic light source devices 61. Each light source set 66 has a vertical plane passing through the optical axis X of the light guide device 81 by intersecting the optical axis d of the emitted light of each light source set 66 in the vicinity of the incident surface of the light guide device 81. Are arranged symmetrically.

  The first monochromatic light source device 61R is arranged on the optical axis d of the emitted light of each light source set 66, and the second monochromatic light source device 61G and the third monochromatic light source device 61B are emitted from each light source set 66. It is arranged as a direction orthogonal to the optical axis d of light.

  Each monochromatic light source device 61 is formed by a light emitting means 62 and a light guiding means 63 that guides the light emitted from the light emitting means 62 to the optical axis combining unit 65. The light emitting means 62 is a red light emitting diode, a green light emitting diode, and a blue light emitting diode, respectively.

  In addition, each light guide means 63 in each monochromatic light source device 61 has a truncated pyramid shape and is formed such that the area of the end portion on the optical axis combining unit 65 side is larger than the end portion on the light emitting means 62 side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The projector according to the present invention has a built-in control circuit as projector control means, and has a projection port 93 provided with a lens cover 92 on the front plate 3 of the case which is a substantially rectangular parallelepiped as shown in FIG. is there.

  On the top plate 2 of the case, there are a key as a power switch 10, a manual image quality adjustment key 12, an automatic image quality adjustment key 13, a power lamp indicator 11, a light emitting means indicator 14, an overheat indicator 15, and other keys and indicators, a speaker. It has a loudspeaker hole 16 and an open / close lid 17 on the inside, and a back plate (not shown) inputs various signals such as a power connector, a USB terminal connected to a personal computer, a video terminal for video signal input, and a mini D-sub terminal. It has a terminal.

  The upper opening / closing lid 17 has sub-keys for fine adjustment of image quality and image and various operation settings of the projector 1, an intake hole on the left side plate of the case, and an exhaust hole 8 on the right side plate 5. Is provided and has a cooling fan inside.

  In addition, the front plate 18 has a front foot member 18 that can adjust the amount of protrusion, and the rear plate has a fixed rear foot member 19 on the left and right of the bottom plate. By changing the front height of the projector 1, an image can be projected according to the height of the screen.

  As shown in FIG. 2, the control circuit as the projector control means of the projector 1 includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. Thus, the image signals of various standards input from the input / output connector unit 21 are unified into image signals of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted to, it is sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. There is a projection system in which light emitted from the light emitting means 62 included in the light source unit is incident on the display element 51 through various optical systems, thereby forming an optical image with the reflected light of the display element 51 to be a projection side optical system An image is projected and displayed on a screen (not shown) via a lens group, and a movable lens group 97 of the projection system lens group is driven by a lens motor 45 for zoom adjustment and focus adjustment.

  In addition, the image compression / decompression unit 31 performs a recording process for sequentially writing a luminance signal and a color difference signal of an image signal to a memory card 32 that is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded on the memory card 32 is read, and individual image data constituting a series of moving images is expanded in units of one frame and sent to the display encoder 24 via the image conversion unit 23. A moving image or the like can be displayed based on the stored image data.

  The control unit 38 controls operation of each circuit in the projector 1, and includes a ROM that stores operation programs such as a CPU and various settings in a fixed manner, and a RAM that is used as a work memory. ing.

  Further, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface plate 2 of the main body case is directly sent to the control unit 38, and the key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is sent to the control unit 38.

  An audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts the audio data into analog data in the projection mode and the playback mode. The speaker 48 can be driven to emit loud sounds.

  The control unit 38 controls the power supply control circuit 41 in accordance with the image signal. The power supply control circuit 41 controls the red, green, and blue light emitting diodes in a time-sharing manner. Further, the cooling fan drive control circuit 43 performs temperature detection by a plurality of temperature sensors provided in the vicinity of the light source unit 80 to control the rotation speed of the cooling fan.

  As shown in FIG. 3, a circuit board 103 provided with projector control means 101 and a lamp power supply circuit 102 is disposed in the vicinity of the front plate 3 inside the projector 1. A cooling fan 111 is disposed in the vicinity of the exhaust hole 8 of the right side plate 5 and in the vicinity of the back plate 4. Further, a plurality of air intake holes 9 are formed in the left side plate 6 so that outside air can be taken into the projector 1.

  Further, a light source unit 80 having a plurality of monochromatic light source devices 61 each having a light emitting diode as a light emitting means 62, a light guide device 81 that emits light with a uniform intensity of a light beam emitted from the light source unit 80, or a light guide device A light source side lens group as a light source side optical system 70 that transmits the light beam emitted from 81 to the display element 51, a reflection mirror 88, and the like are arranged.

  Further, a display element 51 that displays an image by controlling the reflection of incident light by arranging a plurality of pixels in a matrix in the row direction and the column direction at a position where the reflected light from the reflection mirror 88 is irradiated. Has been placed. Further, a projection-side optical system 90 including a fixed lens group 98 and a movable lens group 97 that project the light emitted from the display element 51 onto a projection surface such as a screen is disposed in the vicinity of the left side plate 6.

  The display element 51 is a display element 51 that does not have means for coloring incident light such as a color filter. In this embodiment, a micromirror display element generally abbreviated as DMD (Digital Micromirror Device) is used. Yes. The horizontal to vertical ratio of the micromirror display element is usually 4 to 3.

  The micromirror display element is configured to convert light incident from an incident direction tilted in one direction with respect to the front direction into front-state on-state rays and oblique off-state rays by switching the tilt directions of the plurality of micromirrors. The image is displayed by being divided and divided. In addition, the micromirror display element converts the light incident on the micromirror tilted in one tilt direction into an on-state light beam reflected by the micromirror in the front direction, and enters the micromirror tilted in the other tilt direction. The light is reflected by the micro mirror in an oblique direction to form an off-state light beam, and the off-state light beam is absorbed by the light absorption plate, and bright display by reflection in the front direction and dark display by reflection in the oblique direction. An image is displayed.

  As shown in FIG. 4, the light source unit 80 is a combination of two light source sets 66 having the same shape, and each light source set 66 has three single color light source devices 61 having different emission colors. (61R, 61G, 61B) and an optical axis synthesizing unit 65 that matches the optical axis of the emitted light of each monochromatic light source device 61, and one monochromatic light source device on the optical axis d of the emitted light of each light source set 66 61R is disposed and two monochromatic light source devices 61G and 61B are arranged in the same direction with respect to the optical axis d, and are arranged symmetrically with the optical axis d of the emitted light of each light source set 66 intersecting. It is.

  The monochromatic light source device 61 is formed by a light emitting means 62 and a light guiding means 63 that guides the light emitted from the light emitting means 62 to the optical axis combining unit 65.

  Further, as the light emitting means 62, a red light emitting diode 62R, a green light emitting diode 62G, and a blue light emitting diode 62B are used, and the light emitting diodes of each color are arranged in each monochromatic light source device 61.

  Further, the light guide means 63 is a glass rod having a quadrangular pyramid shape and having an upper surface as an incident surface, a bottom surface as an emission surface, and a side surface as a reflection surface, and includes a light emitting means 62 on the upper surface, and the bottom surface is an optical axis combining unit 65. It is arranged to face. In addition, the light guide means 63 is formed such that the area of the bottom surface, which is the end portion on the optical axis combining unit 65 side, is larger than the top surface on which the light emitting means 62 is disposed, and light incident from the top surface is reflected by the side surface. It is repeatedly brought close to parallel light and emitted toward the optical axis synthesis unit 65 from the bottom surface.

  In addition, it is not limited to a solid glass rod, but may be a hollow cylindrical body having an inner surface as a reflecting surface. In the case of the most glass rod, light can be efficiently transmitted to the optical axis combining unit 65 by total reflection.

  Each monochromatic light source device 61 includes a first monochromatic light source device 61R having a red light emitting diode 62R, a second monochromatic light source device 61G having a green light emitting diode 62G, and a third monochromatic device having a blue light emitting diode 62B. The light source device 61B, the first monochromatic light source device 61R is disposed on the optical axis d of the emitted light of the light source set 66, the second monochromatic light source device 61G and the third monochromatic light source device 61B, The light source set 66 is arranged as a direction orthogonal to the optical axis d of the emitted light.

  Further, the optical axis combining unit 65 includes two optical axis alignment members 64. The optical axis alignment member 64 converts light incident from two directions from a predetermined direction among the light incident from the two directions. Light is emitted on the same optical axis as the incident light. In this embodiment, a dichroic prism is used.

  The dichroic prism has a substantially cubic shape, and two predetermined adjacent surfaces among the side surfaces are incident surfaces, and a surface opposite to a predetermined one of the two incident surfaces is an emission surface. The remaining side surfaces, the top surface, and the bottom surface are reflecting surfaces. Further, a diagonal surface connecting the diagonal lines of the top surface and the bottom surface is provided, and this diagonal surface is a dichroic reflection surface that reflects light of a predetermined wavelength and transmits other light.

  The optical axis combining unit 65 brings the first optical axis alignment member 64a and the second optical axis alignment member 64b, which are the two optical axis alignment members 64, into close contact so that the two optical axes are the same. The second optical axis aligning member 64b is positioned on the exit side of the first optical axis aligning member 64a, and the first and second in the front-rear direction on the optical axis d of the emitted light of the light source set 66. The two dichroic reflecting surfaces of the optical axis alignment members 64a and 64b are arranged. The first optical axis alignment member 64a and the second optical axis alignment member 64b are fixed with an adhesive having a low refractive index.

  Further, the first monochromatic light source device 61R in each light source set 66 is fixed to the incident surface of the first optical axis alignment member 64a so as to coincide with the optical axis d of the emitted light of the light source set 66, and the second monochromatic light source The device 61G is fixed to the incident surface of the first optical axis alignment member 64a so as to be perpendicular to the optical axis d of the light emitted from the light source set 66, and the third monochromatic light source device 61B is the optical axis of the light emitted from the light source set 66. It is fixed to the incident surface of the second optical axis alignment member 64b so as to be perpendicular to d. The monochromatic light source device 61 and the light incident surface of the optical axis alignment member 64 are fixed with an adhesive having a low refractive index.

  Then, the light bundle emitted from the first monochromatic light source device 61R is incident on the first optical axis alignment member 64a and is transmitted through the dichroic reflection surfaces of the first and second optical axis alignment members 64a and 64b. It is injected outside.

  The light beam emitted from the second monochromatic light source device 61G is incident on the first optical axis alignment member 64a, and is reflected by the dichroic reflecting surface of the first optical axis alignment member 64a. It is aligned with the axis d, and then passes through the dichroic reflecting surface of the second optical axis alignment member 64b and is emitted to the outside.

  Further, the light beam emitted from the third monochromatic light source device 61B is incident on the second optical axis alignment member 64b, and is reflected by the dichroic reflection surface of the second optical axis alignment member 64b so that the optical axis is light. It is injected to the outside along the axis d.

  The two light source sets 66 constituting the light source unit 80 are arranged so that the bottom surfaces of the second monochromatic light source device 61G and the third monochromatic light source device 61B in each light source set 66 face each other. The optical axes of the emitted light of 66 intersect with each other in the vicinity of the incident surface of the light guide device 81 and are arranged symmetrically with respect to the vertical plane passing through the optical axis X of the light guide device 81.

  The light guide device 81 is a rectangular parallelepiped shape having a rectangular cross section, an entrance surface and an exit surface, and is a light guide rod formed of optical glass or a hollow light tunnel having an inner surface as a reflection surface. The light guide device 81 guides light incident from the incident surface while being reflected by the reflection surface on the inner peripheral surface of the light guide device 81, and emits the light from the emission surface as light having a uniform intensity distribution.

  The light source side lens group as the light source side optical system 70 excludes diffused light that becomes unnecessary light from the light bundle emitted from the light source unit 80 and having a uniform intensity distribution by the light guide device 81, and the reflection mirror 88. The reflection mirror 88 reflects the light transmitted through the light source side optical system 70 toward the display element 51, thereby causing the display element 51 to tilt from one direction with respect to the front direction. It projects light.

  The projection-side optical system 90 includes a fixed lens barrel containing a fixed lens group 98 and a movable lens group 97 which is engaged with the fixed lens barrel and can move forward and backward in the axial direction by a rotating operation. The projection-side optical system 90 includes a lens barrel and forms a zoom lens by a combination of a plurality of lenses incorporated in these lens barrels.

  Thus, the projector 1 controls the three color light emitting diodes 62R, 62G, and 62B in a time-sharing manner and emits the light toward the incident surface of the light guide device 81. The intensity distribution is made uniform and emitted from the emission surface, and can be projected toward the display element 51 by the light source side optical system 70 and the reflection mirror 88.

  Then, in the display element 51, the monochrome image light of each color is sequentially formed on the display element 51 by the on-state light beam reflected in the front direction, and the monochrome image light of each color sequentially emitted from the display element 51 is converted into the lens of the projection-side optical system 90. The image is enlarged by the groups 97 and 98 and projected onto the projection plane, and a full-color image in which three color single-color images are superimposed on the projection plane is displayed.

  Next, effects of the monochromatic light source device 61, the light source unit 80, and the projector 1 according to the present embodiment will be described. Conventionally, since a light source set in which monochromatic light source devices are arranged on three incident surfaces of a cross dichroic mirror is used, if two light source sets are arranged in a horizontal direction in order to increase the amount of light, the monochromatic light source device of each light source set If the monochromatic light source devices are arranged so as not to interfere with each other, the angle formed by the optical axis of the light bundle emitted from each light source set and the optical axis of the light guide device becomes large. Therefore, there is a problem that light that becomes unnecessary light exists in the subsequent optical system or the like.

  However, by arranging the monochromatic light source devices 61 in two directions as in this embodiment, the monochromatic light source devices 61 do not interfere with each other even when the two light source sets 66 are arranged side by side in the horizontal direction. The angle formed by the optical axis d of the light beam emitted from the set 66 and the optical axis X of the light guide device 81 is kept small, and light that becomes unnecessary light in the subsequent optical system or the like is reduced, so that the light use efficiency is high. The projector 1 can be used.

  Then, by arranging two dichroic reflecting surfaces in the front-rear direction on the optical axis d of the emitted light of each light source set 66, it becomes easy to arrange the monochromatic light source device 61.

  Also, the first monochromatic light source device 61R is arranged on the optical axis d of the emitted light of each light source set 66, and the second monochromatic light source device 61G and the third monochromatic light source device 61B are arranged for the emitted light of each light source set 66. By arranging them in a direction perpendicular to the optical axis d, a substantially cubic dichroic prism can be used as the optical axis alignment member 64, and the angle adjustment of the optical axis alignment member 64 and the manufacture of the optical axis synthesis unit 65 are easy. It becomes.

  Furthermore, the monochromatic light source device 61 of the present embodiment is configured by using the light emitting means 62 and the light guide means 63, so that the light beam emitted from the light emitting means 62 is converted into the optical axis alignment member 64 by the light guide means 63. The light can be condensed on the incident surface and can be emitted with uniform intensity.

  Further, as the light guide means 63, a light beam emitted from the light emitting means 62 is used by using a frustum shape in which the area of the optical axis combining unit 65 side end is larger than that of the light emitting means 62 side end. Therefore, unnecessary light such as diffused light that is wasted in the subsequent optical system can be reduced, and the use efficiency of the emitted light from the light emitting means 62 is increased.

  In this embodiment, since a light emitting diode is used as the light emitting means 62, the temperature during light emission can be kept low compared to a conventional discharge lamp, so that the cooling mechanism is easy and the size is small. A reduction in size and weight can also be realized. Further, by using time-division control of these using three color light emitting diodes, a coloring means such as a color wheel is not necessary.

  In this embodiment, one light source unit 80 is used. However, a plurality of light source units 80 can be arranged in the vertical direction, and a plurality of light source units 80 are arranged in the vertical direction in this way. The amount of light can be increased. Further, although the light guide means 63 has a quadrangular pyramid shape, other pyramid shapes or a truncated cone shape can also be used.

  In this embodiment, an adhesive having a low refractive index is used as a method for connecting the monochromatic light source device 61 and the optical axis aligning member 64. However, an air layer is formed between the monochromatic light source device 61 and the optical axis aligning member 64. It is also possible.

  Further, in the present embodiment, the arrangement positions of the three monochromatic light source devices 61R, 61G, 61B are clearly described, but the present invention is not limited to this, and the optical axis alignment used in the optical axis synthesis unit 65 is not limited to this. It can be freely deformed by the function of the member 64.

  Next, a modified example of the present embodiment will be described. In the above-described embodiment, the conical frustum-shaped glass rod is used as the light guide means 63, but a condensing lens can also be used as shown in FIG.

  Thus, by using a condensing lens as the light guide means 63, the monochromatic light source device 61 can be made smaller than when the glass rod is used as the light guide means 63, and between the light emitting means 62 and the light guide means 63. Therefore, it is possible to prevent the heat of the light emitting means 62 from being transmitted to the light guiding means 63.

  As yet another modification, in the above-described embodiment, a dichroic prism is used as the optical axis alignment member 64, but a dichroic mirror can also be used as shown in FIG. This dichroic mirror reflects light of a predetermined wavelength and transmits other light.

  By forming a dichroic reflecting surface with a dichroic mirror as the optical axis alignment member 64 in this way, a space is created between the two optical axis alignment members 64a and 64b when the optical axis combining unit 65 is formed. The change can be easily made and the cooling effect is enhanced.

  As another modification, a light emitting diode is used as the light emitting means 62 in the above-described embodiments, but red, green, and blue laser light emitting devices can also be used as the light emitting means 62. Thus, when a laser light emitting device is used as the light emitting means 62, a diffusion lens is used as the light guiding means 63.

  Thus, by using a laser light emitting device as the light emitting means 62, a light source is bright, and the laser light has a property of traveling straight without diffusing the light, so that almost no unnecessary light such as diffused light is emitted. In other words, the utilization efficiency of the light emitted from the light emitting means 62 is increased.

  In addition, this invention is not limited to the form of the above Example, A change and improvement are possible freely in the range which does not deviate from the summary of invention.

1 is a perspective view of a projector according to an embodiment of the invention. FIG. 3 is a control block diagram of the projector according to the embodiment of the invention. 1 is a schematic diagram schematically showing the inside of a projector according to an embodiment of the invention. Sectional drawing of the light source unit which concerns on the Example of this invention. Sectional drawing of the light source set which concerns on the modification of this invention. Sectional drawing of the light source set which concerns on the modification of this invention.

Explanation of symbols

1 Projector 2 Top plate
3 Front plate 4 Back plate
5 Right side plate 6 Left side plate
8 Exhaust hole 9 Intake hole
10 Power switch 11 Power indicator
12 Manual image quality adjustment key 13 Automatic image quality adjustment key
14 Luminescent indicator 15 Overheat indicator
16 Loudspeaker 17 Open / close lid
18 Forefoot member 19 Rear foot member
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM
26 Display drive unit 31 Image compression / decompression unit
32 Memory card 35 Ir receiver
36 Ir processing section 37 Key / indicator section
38 Control unit 41 Power control circuit
43 Cooling fan drive control circuit 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 61 Monochromatic light source device
61R 1st monochromatic light source device 61G 2nd monochromatic light source device
61B Third monochromatic light source device 62 Light emitting means
62R Red light emitting diode 62G Green light emitting diode
62B Blue light emitting diode 63 Light guiding means
64 Optical axis alignment member 64a First optical axis alignment member
64b Second optical axis alignment member
65 Optical axis synthesis unit 66 Light source set
70 Light source side optical system 80 Light source unit
81 Light guide device 88 Reflector mirror
90 Projection-side optical system 92 Lens cover
93 Projection port 97 Movable lens group
98 Fixed lens group 101 Projector control means
102 Lamp power circuit 103 Circuit board
111 Cooling fan

Claims (9)

There are two sets of light sources, each consisting of three single-color light source devices with different emission colors and an optical axis synthesis unit that matches the optical axes of the emitted light of each single-color light source device.
The two light source sets have two single-color light source devices arranged in the same direction with respect to the optical axis of the emitted light of each light source set, and are symmetrical by crossing the optical axes of the emitted light of each light source set. A light source unit that is arranged.   The first monochromatic light source device is disposed on the optical axis of the emitted light of each light source set, and the second monochromatic light source device and the third monochromatic light source device are orthogonal to the optical axis of the emitted light of each light source set. The light source unit according to claim 1, wherein the light source unit is arranged as a direction to perform.   3. The light source according to claim 1, wherein each monochromatic light source device is formed by a light emitting unit and a light guiding unit that guides light emitted from the light emitting unit to the optical axis combining unit. unit.   4. The light source unit according to claim 3, wherein the light emitting means of the three monochromatic light source devices in the light source set are a red light emitting diode, a green light emitting diode, and a blue light emitting diode, respectively.   Each light guide means in each said monochromatic light source apparatus is a truncated pyramid shape, and the area of the optical-axis synthetic | combination unit side edge part is formed larger than the light-emitting means side edge part. Item 5. The light source unit according to Item 4.   4. The light source unit according to claim 3, wherein the three monochromatic light source devices in the light source set are red, green, and blue laser light emitting devices, respectively, and have a diffusing lens as the light guiding unit.   7. Each of the optical axis combining units is provided with two dichroic reflecting surfaces in the front-rear direction on the optical axis of the light emitted from the light source set. 8. Light source unit. A light source unit;
A light guide device and a light source side optical system;
A display element;
A projection-side optical system;
Projector control means,
The light source unit is
There are two sets of light sources including three single-color light source devices having different emission colors and an optical axis synthesis unit that matches the optical axes of the emitted light of each single-color light source device.
Each light source set is arranged symmetrically with respect to a vertical plane passing through the optical axis of the light guide device by intersecting the optical axis of the emitted light of each light source set in the vicinity of the incident surface of the light guide device. Characteristic projector.   The projector according to claim 8, wherein a plurality of the light source units are stacked in a vertical direction.

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