JP2012079622A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device and a projector, in which higher luminance is achieved.SOLUTION: The light source is provided with: a first light source array 10 where a plurality of first light sources for emitting first lights are arranged; a second light source array 20 where a plurality of second light sources for emitting second lights are arranged; and a first synthetic optical system 50 for synthesizing the plurality of first lights emitted by the first light source array 10 and the plurality of second lights emitted by the second light source array 20 so as not to overlap each other.

Description

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

  In recent years, laser light sources have attracted attention as high-efficiency light sources with a wide color gamut for high performance projectors. For the purpose of increasing the brightness, a projector using a plurality of laser light sources is known. For example, the illumination device of Patent Document 1 excites a yellow phosphor using a plurality of laser light sources of blue light as a fluorescence excitation source, and mixes blue light from the laser light source with yellow light emitted from the phosphor. This creates white light.

JP 2004-327361 A

  However, since a plurality of blue lights are concentrated and irradiated on one point of the phosphor, the light density of the blue light on the phosphor surface becomes high, and the phosphor becomes high temperature or light saturation occurs. As a result, the conversion efficiency of the phosphor to fluorescence decreases, and the brightness decreases.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a light source device and a projector capable of achieving high luminance.

  In order to solve the above problems, a light source device according to the present invention includes a first light source array in which a plurality of first light sources that emit first light are arranged, and a plurality of second light sources that emit second light. The arranged second light source array, the plurality of first lights emitted by the first light source array, and the plurality of second lights emitted by the second light source array are combined so as not to overlap each other. A first synthesizing optical system.

  According to this light source device, the first combining optical system fills the gap between the plurality of first lights emitted from the first light source array and the plurality of second lights emitted from the second light source array. Complementary synthesis to fit. Thus, it is not the structure which concentrates and irradiates the several light shown to patent document 1 to one point. Therefore, all the light emitted by the first light source array and the second light source array is extracted without loss. Therefore, it is possible to provide a light source device capable of achieving high brightness.

  In the light source device, the first light source array includes the plurality of first light sources arranged in a first direction as viewed from the emission direction of the first light and the first direction. The second light source array is arranged along a second direction orthogonal to each other, and the plurality of second light sources are arranged along a third direction as viewed from the direction of emission of the second light. May be arranged along a fourth direction orthogonal to the third direction.

  According to this light source device, the light intensity distribution can be made uniform as compared with a configuration in which a plurality of light sources are irregularly arranged in the light source array.

  In the light source device, an arrangement interval of the plurality of first light sources arranged along the first direction is the same as an arrangement interval of the plurality of first light sources arranged along the second direction. The arrangement interval of the plurality of second light sources arranged along the third direction may be the same as the arrangement interval of the plurality of second light sources arranged along the fourth direction. Good.

  According to this light source device, the light intensity distribution can be made uniform as compared with a configuration in which the light source array has different light source arrangement intervals in the vertical and horizontal directions.

  In the light source device, an arrangement interval of the plurality of first light sources arranged along the first direction is the same as an arrangement interval of the plurality of second light sources arranged along the third direction. The arrangement interval of the plurality of first light sources arranged along the second direction may be the same as the arrangement interval of the plurality of second light sources arranged along the fourth direction. Good.

  According to this light source device, the light intensity distribution can be made uniform as compared with the configuration in which the arrangement intervals of the light sources are different between the first light source array and the second light source array.

  In the light source device, in the first light source array and the second light source array, a plurality of first lights emitted by a plurality of first light sources arranged along the first direction are in the third direction. And a plurality of first light sources arranged along the second direction so as to be located at the center of the emission intervals of the plurality of second lights emitted by the plurality of second light sources arranged along The plurality of first lights emitted by the plurality of second lights emitted by the plurality of second light sources arranged along the fourth direction are disposed at the center of the emission interval of the plurality of second lights emitted by the plurality of second light sources arranged along the fourth direction. May be.

  According to this light source device, the first light is synthesized so as to be positioned at the center of the emission interval of the second light. Therefore, the light intensity distribution can be made uniform uniformly.

  In the light source device, the first light may be the same color as the second light.

  According to this light source device, it is possible to obtain strong light having a uniform light intensity distribution of the same color.

  The light source device may include an integrator optical system that uniformizes a light intensity distribution of the light combined by the first combining optical system.

  According to this light source device, the light intensity distributions of the first light and the second light emitted discretely can be made uniform.

  In the light source device, the first combining optical system includes a half mirror and a reflection mirror, and the half mirror reflects half of the plurality of first lights emitted by the first light source array. The first half of the plurality of second lights emitted by the second light source array is reflected by the first light source while being transmitted toward the mirror and the other half is reflected in a direction different from the first light source array. And the other half is reflected in the same direction as the transmission direction of the first light transmitted through itself, and the reflection mirror transmits the first light transmitted through the half mirror. The reflection direction of the first light reflected by itself while reflecting the second light reflected by the half mirror while reflecting in the same direction as the reflection direction of the first light reflected by the half mirror It may be reflected in the same direction.

  According to this light source device, the plurality of first lights reflected by the half mirror and the plurality of second lights transmitted through the half mirror are combined in a complementary manner so as to fill the gaps between each other. Also, the plurality of first lights that are transmitted through the half mirror and reflected by the reflecting mirror and the plurality of second lights that are reflected by the half mirror and reflected by the reflecting mirror are complementarily filled with each other. Is synthesized. For example, when twelve first light sources per unit area are arranged in the first light source array and twelve second light sources per unit area are arranged in the second light source array, 24 light per unit area is obtained by the half mirror. And 24 light per unit area is extracted by the reflecting mirror. For this reason, the light flux taken out per unit area increases. Therefore, the light intensity distribution can be made uniform.

  In the light source device, the first combining optical system includes a polarization separation element and a reflection mirror, and the polarization separation element converts the plurality of first lights emitted by the first light source array into P-polarized light. And the first polarized light separated by itself and transmitted to the reflecting mirror, and the other polarized light is reflected in a different direction from the first light source array, and the second The plurality of second lights emitted from the light source array are separated into P-polarized light and S-polarized light, and one polarization of the second light separated by itself is reflected by the reflected direction of the first light. Reflecting the other polarized light in the same direction as the transmission direction of the first light transmitted in the same direction and transmitting the other polarized light, the reflection mirror transmits the one polarization of the first light transmitted through the polarization separation element. By polarization separation element The first light that is reflected in the same direction as the reflection direction of the other polarized light of the first light that is emitted and the other polarized light of the second light reflected by the polarization separation element is reflected by itself The light may be reflected in the same direction as the direction of reflection of one of the polarized lights.

  According to this light source device, the plurality of first lights reflected by the polarization separation element and the plurality of second lights transmitted through the polarization separation element are complementarily synthesized so as to fill the gaps between each other. In addition, the plurality of first lights transmitted through the polarization separation element and reflected by the reflection mirror and the plurality of second lights reflected by the polarization separation element and reflected by the reflection mirror fill the gaps between each other. Complementarily synthesized. For example, when twelve first light sources per unit area are arranged in the first light source array and twelve second light sources per unit area are arranged in the second light source array, 24 polarization units per unit area are provided by the polarization separation element. As the light is extracted, 24 light per unit area is extracted by the reflecting mirror. For this reason, the light flux taken out per unit area increases. Therefore, the light intensity distribution can be made uniform.

  In the light source device, a third light source array in which a plurality of third light sources are arranged, a fourth light source array in which a plurality of fourth light sources are arranged, and the plurality of third light sources emitted by the third light source array. A second combining optical system that combines the light and the plurality of fourth lights emitted from the fourth light source array so as not to overlap each other; and the plurality of first light combined by the first combining optical system A third synthesis optical system for synthesizing the light, the plurality of second light, the plurality of third light synthesized by the second synthesis optical system, and the plurality of fourth light so as not to overlap each other; , May be provided.

  According to the light source device, the plurality of first lights and the plurality of second lights synthesized by the first synthesis optical system and the plurality of third lights and the plurality of fourth lights synthesized by the second synthesis optical system. Are complementarily synthesized so as to fill each other's gaps. For example, when 24 light per unit area is extracted by the first combining optical system and 24 light per unit area is extracted by the second combining optical system, 48 light per unit area is output by the third combining optical system. It will be taken out. For this reason, strong light having a uniform light intensity distribution can be obtained. Therefore, it is possible to provide a light source device capable of achieving high brightness.

  In the light source device, the first light, the second light, the third light, and the fourth light may have the same color.

  According to this light source device, it is possible to obtain strong light having a uniform light intensity distribution of the same color.

  In the light source device, the first light and the second light may be blue light, and the third light and the fourth light may be yellow light.

  According to this light source device, it is possible to take out strong white light having a uniform light intensity distribution by juxtaposing and mixing blue light and yellow light.

  The projector according to the present invention includes the light source device described above, a light modulation device that modulates light emitted from the light source device according to image information, and a projection optical system that projects the modulated light from the light modulation device as a projection image. And.

  According to this projector, since the light source device described above is provided, a projector capable of achieving high brightness can be provided.

It is a schematic diagram which shows the optical system of the projector which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the 1st light source array which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the 2nd light source array which concerns on 1st Embodiment of this invention. It is a graph which shows the light emission characteristic of the light source and fluorescent substance which concern on 1st Embodiment of this invention. It is a figure which shows the light synthesize | combined by the 1st synthetic | combination optical system. It is a schematic diagram which shows the light source device which concerns on 2nd Embodiment of this invention. It is a figure which shows the light synthesize | combined by the 3rd synthetic | combination optical system. It is a figure which shows the modification of the light source array which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, an actual structure and a scale, a number, and the like in each structure are different.

  In the following description, the XYZ rectangular coordinate system shown in FIG. 1 is set, and each member will be described with reference to this XYZ rectangular coordinate system.

(First embodiment)
FIG. 1 is a schematic diagram showing an optical system of a projector 1000 according to the first embodiment of the present invention. In FIG. 1, reference numeral 100ax denotes an illumination optical axis (the optical axis of light emitted from the light source device 1 toward the color separation light guide optical system 200). The optical axis refers to a virtual light beam that is representative of a light beam that passes through the entire system in the optical system.
FIG. 2 is a schematic diagram showing the first light source array according to the first embodiment of the present invention. FIG. 2A is a side view of the first light source array, and FIG. 2B is a front view of the first light source array. In FIG. 2B, the symbol W1 is the arrangement interval of the plurality of first light sources 12 arranged along the first direction, and the symbol W2 is the arrangement of the plurality of first light sources 12 arranged along the second direction. The array interval. In FIG. 2B, illustration of the first phosphor 13 and the first collimating lens 14 is omitted for convenience. Further, nine first light sources 12 are arranged on the first base 11 in three rows and three columns, but a plurality of the first light sources 12 may be arranged, and the number of arrangements can be changed as appropriate.
FIG. 3 is a schematic diagram showing the second light source array according to the first embodiment of the present invention. FIG. 3A is a side view of the second light source array, and FIG. 3B is a front view of the first light source array. In FIG. 3B, the symbol W3 is the arrangement interval of the plurality of second light sources 22 arranged along the third direction, and the symbol W4 is the plurality of second light sources 22 arranged along the fourth direction. The array interval. In FIG. 3B, illustration of the second phosphor 23 and the second collimating lens 24 is omitted for convenience. Further, nine second light sources 22 are arranged in three rows and three columns on the second base 21, but a plurality of the second light sources 22 may be arranged, and the number of arrangements can be changed as appropriate.
FIG. 4 is a graph showing the light emission characteristics of the light source and the phosphor according to the first embodiment of the present invention. 4A is a graph showing the light emission characteristics of the light source, and FIG. 4B is a graph showing the light emission characteristics of the phosphor. Note that the emission characteristics are the characteristics of what wavelength of light is emitted with what intensity when a voltage is applied to a light source and excitation light is incident on a phosphor. Say. In FIG. 4, the vertical axis of the graph represents relative light emission intensity, and the light emission intensity at the wavelength with the strongest light emission intensity is 1. The horizontal axis of the graph represents the wavelength. In FIG. 4A, a symbol B is a color light component from which the light source emits blue light as excitation light. In FIG. 4B, symbol R is a color light component that can be used as red light among the light emitted from the phosphor. Symbol G is a color light component that can be used as green light among the light emitted from the phosphor.

  As shown in FIG. 1, the projector 1000 includes a light source device 1, a color separation light guide optical system 200, three liquid crystal light modulation devices 400R, 400G, and 400B as light modulation devices, a cross dichroic prism 500, and projection optics. And a system 600.

  The light source device 1 includes a first light source array 10, a second light source array 20, a first combining optical system 50, a collimating optical system 60, and an illumination optical system 100.

  The first light source array 10 emits first light. The first light source array 10 includes a first base 11, a plurality of first light sources 12 disposed on the first base 11, a first phosphor 13 disposed on the first light source 12, and a first phosphor. 13 and a first collimating lens 14 disposed on 13 (see FIG. 2A). As the first light source 12, a solid-state light source such as a laser light source and a light emitting diode (LED) is used. In the present embodiment, a laser light source that emits blue light (emission intensity peak: about 445 nm, see FIG. 3A) made of laser light is used as the first light source 12. A light source that emits blue light having a wavelength other than 445 nm (for example, 460 nm) can also be used as the light source.

  A plurality of first light sources 12 are arranged in the first light source array 10 along the first direction (Z direction) as viewed from the first light emission direction (+ X direction) and in the first direction. Are arrayed along a second direction (Y direction) orthogonal to (see FIG. 2B). The arrangement interval W1 of the plurality of first light sources 12 arranged along the first direction is the same as the arrangement interval W2 of the plurality of first light sources 12 arranged along the second direction ( W1 = W2).

  The first phosphor 13 is formed on the first light source 12. The first phosphor 13 is excited by the excitation light emitted from the first light source 12, and emits fluorescence (yellow light) having a color different from that of the excitation light (blue light).

Specifically, the first phosphor 13 converts part of the blue light from the first light source 12 into light including red light and green light, and without converting the remaining part of the blue light. Let it pass. The first phosphor (see FIG. 4) is efficiently excited by blue light having a wavelength of about 445 nm, converted into yellow light (fluorescence) including red light and green light, and emitted. The first phosphor 13 is, for example, a YAG-based phosphor _{(Y, Gd) 3 (Al} , Ga) 5 O 12: consists of particles containing Ce. In addition, you may use the particle | grains containing the other fluorescent substance which inject | emits fluorescence containing red light and green light as fluorescent substance. Moreover, you may use the particle | grains containing the mixture of the fluorescent substance which converts excitation light into red light, and the fluorescent substance which converts excitation light into green light as fluorescent substance.

  The first collimating lens 14 is formed on the first phosphor 13. The first collimating lens 14 causes the light emitted from the first phosphor 13 to enter the first combining optical system 50 in a substantially collimated state.

  The second light source array 20 emits second light. The second light source array 20 includes a second base 21, a plurality of second light sources 22 disposed on the second base 21, a second phosphor 23 disposed on the second light source 22, and a second phosphor. And a second collimating lens 24 disposed on the head 23 (see FIG. 3A). In the present embodiment, as the second light source 22, a laser light source that emits blue light (peak of emission intensity: about 445 nm, see FIG. 3A) composed of laser light is used as in the first light source 12. In the present embodiment, the first light has the same color as the second light.

  A plurality of second light sources 22 are arranged in the second light source array 20 along the third direction (X direction) as viewed from the second light emission direction (+ Y direction) and in the third direction. Are arranged along a fourth direction (Z direction) orthogonal to (see FIG. 3B). The arrangement interval W3 of the plurality of second light sources 22 arranged along the third direction is the same as the arrangement interval W4 of the plurality of second light sources 22 arranged along the fourth direction ( W3 = W4).

  The second phosphor 23 is formed on the second light source 22. The second phosphor 23 is excited by the excitation light emitted from the second light source 22, and emits fluorescence (yellow light) having a color different from that of the excitation light (blue light).

Specifically, the second phosphor 23 converts part of the blue light from the second light source 22 into light including red light and green light, and without converting the remaining part of the blue light. Let it pass. The second phosphor (see FIG. 4) is efficiently excited by blue light having a wavelength of about 445 nm, converted into yellow light (fluorescence) including red light and green light, and emitted. Similar to the first phosphor 13, the second phosphor 23 is made of, for example, particles containing (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce, which is a YAG phosphor.

  The second collimating lens 24 is formed on the second phosphor 23. The second collimating lens 24 causes the light emitted from the second phosphor 23 to enter the first combining optical system 50 in a substantially collimated state.

  As shown in FIGS. 2B and 3B, the arrangement interval W1 of the plurality of first light sources 12 arranged along the first direction (Z direction) is the third direction (X direction). Is the same interval as the array interval W3 of the plurality of second light sources 22 arrayed along (W1 = W4). The arrangement interval W2 of the plurality of first light sources 12 arranged along the second direction (Y direction) is the arrangement interval W4 of the plurality of second light sources 22 arranged along the fourth direction (Z direction). (W2 = W4).

  In the first light source array 10 and the second light source array 20, a plurality of first lights emitted by a plurality of first light sources 12 arranged along a first direction (Z direction) are in a third direction (X And arranged along the second direction (Y direction) so as to be positioned at the center of the emission intervals of the plurality of second lights emitted by the plurality of second light sources 22 arranged along the direction). Emission of a plurality of second lights emitted by a plurality of second light sources 22 in which a plurality of first lights emitted by a plurality of first light sources 12 are arranged along a fourth direction (Z direction) It arrange | positions so that it may be located in the center of a space | interval.

  The first synthesis optical system 50 includes a half mirror 51 and a reflection mirror 52 (see FIG. 1). The first combining optical system 50 combines the plurality of first lights emitted from the first light source array 10 and the plurality of second lights emitted from the second light source array 20 so as not to overlap each other.

  The half mirror 51 transmits half of the plurality of first lights emitted from the first light source array 10 toward the reflection mirror 52 (in the + X direction), and the other half is the first light source array 10. Reflect in a different direction (+ Y direction). The half mirror 51 transmits half of the plurality of second lights emitted by the second light source array 20 in the same direction (+ Y direction) as the reflection direction of the first light reflected by itself, and the other half. The reflected light is reflected in the same direction (+ X direction) as the transmission direction of the first light that has passed through itself.

  The reflection mirror 52 reflects the first light transmitted through the half mirror 51 in the same direction (+ Y direction) as the reflection direction of the first light reflected by the half mirror 51. The reflection mirror 52 reflects the second light reflected by the half mirror 51 in the same direction (+ Y direction) as the reflection direction of the first light reflected by itself.

  FIG. 5 is a diagram showing light synthesized by the first synthesis optical system 50. In FIG. 5, symbol L <b> 1 is the first light emitted from the first light source array 10, and symbol L <b> 2 is the second light emitted from the second light source array 20. Reference numeral Lw1 is an emission interval of the plurality of first lights emitted by the plurality of first light sources 12 arranged along the first direction, and reference numeral Lw2 is a plurality of the plurality of arrays arranged along the second direction. Emission intervals of a plurality of first lights emitted by the first light source 12, and symbol Lw3 indicates an emission interval of a plurality of second lights emitted by a plurality of second light sources 22 arranged along the third direction. , Lw4 is an emission interval of the plurality of second lights emitted by the plurality of second light sources 22 arranged along the fourth direction, and Lw5 is a plurality of the second lights arranged along the first direction. An emission interval between a plurality of first lights emitted from one light source 12 and a plurality of second lights emitted from a plurality of second light sources 22 arranged along the third direction is denoted by Lw6. A plurality of light emitted by a plurality of first light sources 12 arranged along the direction of 1 of light and the exit gap between the plurality of second light emitted by the fourth plurality of second light sources 22 arranged along the direction of.

  As shown in FIG. 5, the emission intervals Lw1 of the plurality of first lights emitted by the plurality of first light sources 12 arranged along the first direction are the plurality arranged along the second direction. This is the same interval as the emission interval Lw2 of the plurality of first lights emitted by the first light source 12 (Lw1 = Lw2). The emission intervals Lw3 of the plurality of second lights emitted by the plurality of second light sources 22 arranged along the third direction are emitted by the plurality of second light sources 22 arranged along the fourth direction. The same interval as the emission intervals Lw4 of the plurality of second lights thus obtained (Lw3 = Lw4).

  The emission intervals Lw1 of the plurality of first lights emitted by the plurality of first light sources 12 arranged along the first direction are the plurality of second light sources 22 arranged along the third direction. Is the same as the emission interval Lw3 of the plurality of second lights emitted by (1) (Lw1 = Lw3). The emission intervals Lw2 of the plurality of first lights emitted by the plurality of first light sources 12 arranged along the second direction are emitted by the plurality of second light sources 22 arranged along the fourth direction. The same interval as the emission intervals Lw4 of the plurality of second lights thus obtained (Lw2 = Lw4).

  A plurality of first lights emitted by a plurality of first light sources 12 arranged along a first direction and a plurality of first lights emitted by a plurality of second light sources 22 arranged along a third direction. The light emission interval Lw5 with the second light is a plurality of first light emission intervals Lw1 emitted by the plurality of first light sources 12 arranged along the first direction (arranged along the third direction). In addition, the length is half of the emission intervals Lw3 of the plurality of second lights emitted by the plurality of second light sources 22 (Lw5 = Lw1 / 2). A plurality of first lights emitted by a plurality of first light sources 12 arranged along the second direction and a plurality of first lights emitted by a plurality of second light sources 22 arranged along the fourth direction. The light emission interval Lw6 with the second light is a plurality of first light emission intervals Lw2 emitted by the plurality of first light sources 12 arranged along the second direction (arranged along the fourth direction). In addition, the length is half of the emission intervals Lw4) of the plurality of second lights emitted by the plurality of second light sources 22 (Lw6 = Lw2 / 2).

  The collimating optical system 60 is disposed in the optical path from the first synthesis optical system 50 to the illumination optical system 100. The collimating optical system 60 includes a first lens 61 and a second lens 62. The first lens 61 and the second lens 62 are convex lenses. The collimating optical system 60 causes the light combined by the first combining optical system 50 to enter the illumination optical system 100 in a substantially parallel state.

  As shown in FIG. 1, the illumination optical system 100 is disposed between the collimating optical system 60 and the color separation light guiding optical system 200. The illumination optical system 100 includes an integrator optical system 110, a polarization conversion element 120, and a superimposing lens 130.

  The integrator optical system 110 includes a first fly eye lens 111 and a second fly eye lens 112. The first fly-eye lens 111 and the second fly-eye lens 112 are each composed of a plurality of element lenses arranged in a matrix. The first fly-eye lens 111 divides the light (first light and second light) from the collimating optical system 60 by a plurality of element lenses constituting the first fly-eye lens 111 and condenses them individually. Have The second fly-eye lens 112 has a function of emitting the divided light flux from the first fly-eye lens 111 with an appropriate divergence angle by a plurality of element lenses constituting the second fly-eye lens 112. The integrator optical system 110 uniformizes the light intensity distribution of the light synthesized by the first synthesis optical system 50.

  The polarization conversion element 120 is formed of an array having a PBS, a mirror, a retardation plate, etc. as a set of elements. The polarization conversion element 120 has a function of aligning the polarization direction of each partial light beam divided by the first fly-eye lens 111 with linear polarization in one direction.

  The superimposing lens 130 appropriately converges the illumination light passing through the polarization conversion element 120 as a whole, and enables superimposing illumination on the illuminated areas of the liquid crystal light modulation devices 400R, 400G, and 400B.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, and relay lenses 260 and 270. The color separation light guide optical system 200 separates light (first light and second light) from the light source device 1 (illumination optical system 100) into red light, green light, and blue light, and red light, green light. And blue light are guided to the liquid crystal light modulation devices 400R, 400G, and 400B to be illuminated. Condensing lenses 300R, 300G, and 300B are disposed between the color separation light guide optical system 200 and the liquid crystal light modulation devices 400R, 400G, and 400B. The condenser lenses 300R, 300G, and 300B and the relay lenses 260 and 270 are part of the integrator optical system that constitutes the projector 1000.

  The dichroic mirrors 210 and 220 are mirrors in which a wavelength selective transmission film that reflects light in a predetermined wavelength region and transmits light in other wavelength regions is formed on a substrate. Specifically, the dichroic mirror 210 transmits a red light component and reflects a green light component and a blue light component. The dichroic mirror 220 reflects the green light component and transmits the blue light component.

  The reflection mirrors 230, 240, and 250 are mirrors that reflect incident light. Specifically, the reflection mirror 230 reflects the red light component transmitted through the dichroic mirror 210. The reflection mirrors 240 and 250 reflect the blue light component transmitted through the dichroic mirror 220.

  The red light transmitted through the dichroic mirror 210 is reflected by the reflection mirror 230, passes through the condenser lens 300R, and enters the image forming region of the liquid crystal light modulation device 400R for red light. The green light reflected by the dichroic mirror 210 is further reflected by the dichroic mirror 220, passes through the condenser lens 300G, and enters the image forming area of the liquid crystal light modulation device 400G for green light. The blue light transmitted through the dichroic mirror 220 passes through the relay lens 260, the incident-side reflecting mirror 240, the relay lens 270, the exit-side reflecting mirror 250, and the condensing lens 300B, thereby forming an image of the liquid crystal light modulation device 400B for blue light. Incident into the area.

  The relay lenses 260 and 270 and the reflection mirrors 240 and 250 have a function of guiding the blue light component transmitted through the dichroic mirror 220 to the liquid crystal light modulation device 400B. Thereby, even when the length of the optical path of blue light is longer than the length of the optical path of the other color light, it is possible to suppress a decrease in utilization efficiency of the blue light due to the divergence of the blue light. In addition, when the length of the optical path of other color light (for example, red light) is longer than the length of the optical path of blue light, the structure which arrange | positions the relay lenses 260 and 270 and the reflective mirrors 240 and 250 in the optical path of red light is also considered. It is done.

  The liquid crystal light modulation devices 400R, 400G, and 400B form color images by modulating incident color light in accordance with image information, and are the illumination target of the light source device 1. Although not shown, incident-side polarizing plates are disposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal light modulators 400R, 400G, and 400B, respectively. Further, an exit-side polarizing plate is disposed between each of the liquid crystal light modulation devices 400R, 400G, and 400B and the cross dichroic prism 500. The incident-side color light is modulated by the incident-side polarizing plate, the liquid crystal light modulation devices 400R, 400G, and 400B and the emission-side polarizing plate.

  For example, the liquid crystal light modulation devices 400R, 400G, and 400B are transmissive liquid crystal light modulation devices in which liquid crystal is hermetically sealed in a pair of transparent substrates, and a polysilicon TFT is used as a switching element in accordance with a given image signal. Modulates the deflection direction of one type of linearly polarized light emitted from an incident side polarizing plate (not shown).

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from an exit side polarizing plate (not shown). The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded. A dielectric multilayer film is formed on the substantially X-shaped interface to which the right-angle prism is bonded. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

  According to the light source device 1 of the present embodiment, a plurality of first lights emitted from the first light source array 10 and a plurality of second lights emitted from the second light source array 20 by the first synthesis optical system 50. Are complementarily synthesized so as to fill the gaps between each other. Thus, it is not the structure which concentrates and irradiates the several light shown to patent document 1 to one point. Therefore, all the light emitted by the first light source array 10 and the second light source array 20 is extracted without loss. Therefore, it is possible to provide the light source device 1 capable of increasing the brightness.

  Further, according to this configuration, the first light source array 10 includes the plurality of first light sources 12 arranged in vertical and horizontal alignments, and the second light source array 20 includes the plurality of second light sources 22 aligned in vertical and horizontal directions. Are arranged. For this reason, the light intensity distribution can be made uniform as compared with a configuration in which a plurality of light sources are irregularly arranged in the light source array.

  Further, according to this configuration, the arrangement interval W1 of the plurality of first light sources 12 arranged along the first direction is equal to the arrangement interval W2 of the plurality of first light sources 12 arranged along the second direction. The arrangement interval W4 of the plurality of second light sources 22 arranged in the fourth direction is the same as the arrangement interval W3 of the plurality of second light sources 22 arranged in the third direction. The interval is the same. For this reason, the light intensity distribution can be made uniform as compared with a configuration in which the light source array has different light source arrangement intervals in the vertical and horizontal directions.

  Further, according to this configuration, the arrangement interval W1 of the plurality of first light sources 12 arranged along the first direction is equal to the arrangement interval W3 of the plurality of second light sources 22 arranged along the third direction. The arrangement interval W4 of the plurality of second light sources 22 arranged in the fourth direction is the same as the arrangement interval W2 of the plurality of first light sources 12 arranged in the second direction. The interval is the same. For this reason, it is possible to make the light intensity distribution uniform compared to a configuration in which the arrangement interval of the light sources is different between the first light source array and the second light source array.

  Further, according to this configuration, the first light source array 10 and the second light source array 20 are configured such that the plurality of first lights emitted by the plurality of first light sources 12 arranged along the first direction are the third. A plurality of second light sources 22 arranged at the center of the emission interval of the plurality of second lights emitted by the plurality of second light sources 22 arranged along the direction of The plurality of first lights emitted by the one light source 12 are positioned at the center of the emission intervals of the plurality of second lights emitted by the plurality of second light sources 22 arranged along the fourth direction. Has been placed. For this reason, it synthesize | combines so that 1st light may be located in the center of the emission interval of 2nd light. Therefore, the light intensity distribution can be made uniform uniformly.

  According to this configuration, since the first light has the same color as the second light, strong light having a uniform light intensity distribution of the same color can be obtained.

  Further, according to this configuration, since the integrator optical system 110 that equalizes the light intensity distribution of the light synthesized by the first synthesis optical system 50 is provided, the first light and the second light emitted discretely are provided. The light intensity distribution of the light can be made uniform.

  Further, according to this configuration, since the first combining optical system 50 includes the half mirror 51 and the reflection mirror 52, the plurality of first lights reflected by the half mirror 51 and the plurality of first lights transmitted through the half mirror 51. The two lights are complementarily synthesized so as to fill the gaps between each other. Further, the plurality of first lights that are transmitted through the half mirror 51 and reflected by the reflecting mirror 52 and the plurality of second lights that are reflected by the half mirror 51 and reflected by the reflecting mirror 52 fill the gap between each other. Complementarily synthesized to fit. For example, when twelve first light sources 12 per unit area are arranged in the first light source array 10 and twelve second light sources 22 are arranged per unit area in the second light source array 20, the unit is formed by the half mirror 51. 24 light is extracted per area, and 24 light per unit area is extracted by the reflecting mirror 52. For this reason, the light flux taken out per unit area increases. Therefore, the light intensity distribution can be made uniform.

  According to the projector 1000 of the present embodiment, since the light source device 1 described above is provided, it is possible to provide the projector 1000 that can achieve high brightness.

  In the light source device 1 of the present embodiment, a light source that emits blue light and light that is excited by a part of the blue light and includes red light and green light (yellow light) is emitted toward the first synthesis optical system. However, the present invention is not limited to this. For example, a light source that emits purple light or ultraviolet light, and fluorescence that is excited by the purple light or ultraviolet light emitted from the light source and emits light including red light, green light, and blue light toward the first synthesis optical system. The body may be used.

  In the light source device 1 of the present embodiment, convex lenses are used as the first lens 61 and the second lens 62 in the collimating optical system 60, but the present invention is not limited to this. In short, it is sufficient that the collimating optical system is made to enter the illumination optical system in a state in which the light emitted from the phosphor portion is substantially parallelized. Further, the number of lenses constituting the collimating optical system may be one, or may be three or more.

  In the projector 1000 of this embodiment, three liquid crystal light modulation devices are used as the liquid crystal light modulation device, but the present invention is not limited to this. The present invention can also be applied to a projector using one, two, four or more liquid crystal light modulation devices.

  In the projector 1000 of the present embodiment, a transmissive projector is used, but the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that the light modulation device as the light modulation means is a type that transmits light, such as a transmission type liquid crystal display device. The “reflective type” means that a light modulation device as a light modulation unit, such as a reflection type liquid crystal display device, reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(Second Embodiment)
FIG. 6 is a schematic diagram showing a light source device 2 according to the second embodiment of the present invention.
As shown in FIG. 6, the light source device 2 according to the present embodiment includes a first combining optical system 70 </ b> A in place of the first combining optical system 50 described above, a third light source array 30 and a fourth light source array. And the light source device 1 according to the first embodiment described above in that the second combining optical system 70B and the third combining optical system 80 are further provided. Since the other points are the same as the above-described configuration, the same elements as those in FIG.

  The light source device 2 includes a first light source array 10, a second light source array 20, a first combining optical system 70A, a first collimating optical system 60A, a third light source array 30, a fourth light source array 40, The second combining optical system 70B, the second collimating optical system 60B, the third combining optical system 80, the third collimating optical system 90, and the illumination optical system 100 are provided.

  The first light source array 10 emits first light. The second light source array 20 emits second light. The third light source array 30 emits third light. The fourth light source array 40 emits fourth light. In the present embodiment, a light source that emits light including P-polarized light and S-polarized light is used as the light source constituting each light source array. Here, “polarized light” refers to light in which an electric field and a magnetic field vibrate only in a specific direction, and “P-polarized light” refers to electromagnetic waves whose electric field components are parallel to the incident surface, “S-polarized light”. "Means an electromagnetic wave whose electric field component is perpendicular to the incident surface. The “incident surface” is a surface (XY surface) that is perpendicular to the reflective surface and includes the incident light and the reflected light when the first light enters the polarization separation element 71A.

  In the present embodiment, the first light, the second light, the third light, and the fourth light have the same color. About the structure of the 3rd light source array 30 and the 4th light source array 40, since it is the same as that of the 1st light source array 10 mentioned above, detailed description is abbreviate | omitted.

  The first combining optical system 70A includes a polarization separation element 71A and a reflection mirror 72A. 70 A of 1st synthetic | combination optical systems synthesize | combine the some 1st light inject | emitted by the 1st light source array 10, and the some 2nd light inject | emitted by the 2nd light source array 20 so that it may not mutually overlap.

  The polarization separation element 71A separates the plurality of first lights emitted from the first light source array 10 into P-polarized light and S-polarized light. The polarization separation element 71A transmits one polarized light (P-polarized light) of the first light separated by itself toward the reflecting mirror 72A (toward the + Y direction), and transmits the other polarized light (S-polarized light) to the first. The light is reflected in a direction different from the light source array 10 (−X direction). The polarization separation element 71A separates the plurality of second lights emitted from the second light source array 20 into P-polarized light and S-polarized light. The polarization separation element 71A transmits one polarization (P-polarized light) of the second light separated by itself in the same direction (−X direction) as the reflection direction of the first light reflected by the polarization separation element 71A. The polarized light (S-polarized light) is reflected in the same direction (+ Y direction) as the transmission direction of the first light that has passed through it.

  The reflection mirror 72A has the same polarization direction of the other polarized light (S-polarized light) of the first light reflected by the polarized light separating element 71A as one polarized light (P-polarized light) transmitted through the polarized light separating element 71A. Reflect in the direction (−X direction). The reflection mirror 72A has the same direction as the reflection direction of the other polarized light (S-polarized light) of the second light reflected by the polarization separation element 71A (S-polarized light) reflected by itself (P-polarized light). -X direction).

  The first collimating optical system 60A is disposed in the optical path from the first combining optical system 70A to the third combining optical system 80. The first collimating optical system 60A includes a first lens 61A and a second lens 62A. The first lens 61A and the second lens 62A are convex lenses. The first collimating optical system 60A causes the light synthesized by the first synthesizing optical system 70A to enter the third synthesizing optical system 80 in a substantially parallel state.

  The second synthesis optical system 70B includes a polarization separation element 71B and a reflection mirror 72B. The second combining optical system 70B combines the plurality of third lights emitted from the third light source array 30 and the plurality of fourth lights emitted from the fourth light source array 40 so as not to overlap each other.

  The polarization separation element 71B separates the plurality of third lights emitted from the third light source array 30 into P-polarized light and S-polarized light. The polarization separation element 71B transmits one polarization (P-polarized light) of the third light separated by itself toward the reflection mirror 72B (toward the + Y direction), and transmits the other polarization (S-polarized light) to the third light. The light is reflected in a direction different from the light source array 30 (−X direction). The polarization separation element 71B separates the plurality of fourth lights emitted from the fourth light source array 40 into P-polarized light and S-polarized light. The polarization separation element 71B transmits one polarization (P-polarized light) of the fourth light separated by itself in the same direction (−X direction) as the reflection direction of the third light reflected by the polarization separation element 71B. The polarized light (S-polarized light) is reflected in the same direction (+ Y direction) as the transmission direction of the third light transmitted through itself.

  The reflection mirror 72B has the same reflection direction of the other polarized light (S-polarized light) of the third light reflected by the polarized light separating element 71B as one polarized light (P-polarized light) of the third light transmitted through the polarized light separating element 71B. Reflect in the direction (−X direction). The reflection mirror 72B has the same direction as the reflection direction of one polarization (P-polarized light) of the third light reflected by the other polarization (S-polarized light) of the fourth light reflected by the polarization separation element 71B ( -X direction).

  The second collimating optical system 60B is disposed in the optical path from the second combining optical system 70B to the third combining optical system 80. The second collimating optical system 60B includes a first lens 61B and a second lens 62B. The first lens 61B and the second lens 62B are convex lenses. The second collimating optical system 60B causes the light combined by the second combining optical system 70B to enter the third combining optical system 80 in a substantially parallel state.

  The third synthesis optical system 80 includes a half mirror 81 and reflection mirrors 82 and 83. The third synthesis optical system 80 includes a plurality of first lights and a plurality of second lights synthesized by the first synthesis optical system 70A and a plurality of third lights and a plurality of lights synthesized by the second synthesis optical system 70B. The fourth light is synthesized so as not to overlap each other.

  The reflection mirror 82 reflects the plurality of first lights and the plurality of second lights synthesized by the first synthesis optical system 70A toward the half mirror 81 (in the + Y direction).

  The half mirror 81 transmits half of both the plurality of first lights and the plurality of second lights reflected by the reflecting mirror 82 toward the third collimating optical system 90 (toward the + Y direction), and the rest Are reflected toward the reflecting mirror 83 (toward the −X direction). The half mirror 81 reflects the third light and the fourth light reflected by the half of both the plurality of third lights and the plurality of fourth lights synthesized by the second synthesis optical system 70B. Are transmitted in the same direction (−X direction), and the other half are reflected in the same direction (+ Y direction) as the transmission direction of the third light and the fourth light transmitted through itself.

  The reflection mirror 83 reflects the third light and the fourth light transmitted through the half mirror 81 in the same direction (+ Y direction) as the reflection direction of the third light and the fourth light reflected by the half mirror 81. . The reflection mirror 83 reflects the first light and the second light reflected by the half mirror 81 in the same direction (+ Y direction) as the reflection direction of the third light and the fourth light reflected by itself.

  The third collimating optical system 90 is disposed in the optical path from the third combining optical system 80 to the illumination optical system 100. The third collimating optical system 90 includes a first lens 91 and a second lens 92. The first lens 91 and the second lens 92 are convex lenses. The third collimating optical system 90 causes the light combined by the third combining optical system 80 to enter the illumination optical system 100 in a substantially parallel state.

  FIG. 7 is a view showing light synthesized by the third synthesis optical system 80. In FIG. 7, symbol L <b> 1 is the first light emitted from the first light source array 10, symbol L <b> 2 is the second light emitted from the second light source array 20, and symbol L <b> 3 is emitted from the third light source array 30. The third light, symbol L4, is the fourth light emitted by the fourth light source array 40.

  As shown in FIG. 7, the emission intervals of the plurality of first lights L1 emitted by the first light source array 10 are the second intervals emitted by the second light source array 10 in the vertical direction and the horizontal direction, respectively. The interval is the same as the emission interval of the light L2. The emission positions of the plurality of first lights L1 are located at the centers of the emission intervals of the plurality of second lights L2. The emission intervals of the plurality of third lights L3 emitted by the third light source array 30 are the emission intervals of the plurality of fourth lights L4 emitted by the fourth light source array 40 in each of the vertical direction and the horizontal direction. The intervals are the same. The emission positions of the plurality of third lights L3 are located at the centers of the emission intervals of the plurality of fourth lights L4.

  The emission positions of the plurality of first lights L1 and the plurality of second lights L2 are at the centers of the emission intervals of the plurality of third lights L3 and the plurality of fourth lights L4 in the vertical direction and the horizontal direction, respectively. positioned. Therefore, the plurality of first lights L1, the plurality of second lights L2, the plurality of third lights L3, and the plurality of fourth lights L4 are extracted at equal intervals in the vertical direction and the horizontal direction, respectively. It will be.

  The illumination optical system 100 includes an integrator optical system 110, a polarization conversion element 120, and a superimposing lens 130. The integrator optical system 110 uniformizes the light intensity distribution of the light synthesized by the third synthesis optical system 80.

  According to the light source device 2 of the present embodiment, since the third light source array 30, the fourth light source array 40, the second synthesis optical system 70B, and the third synthesis optical system 80 are provided, they are synthesized by the first synthesis optical system 70A. The plurality of first lights and the plurality of second lights and the plurality of third lights and the plurality of fourth lights synthesized by the second synthesis optical system 70B are complementarily complemented with each other. Synthesized. For example, when 24 light per unit area is extracted by the first combining optical system 70A and 24 light per unit area is extracted by the second combining optical system 70B, 48 light per unit area is acquired by the third combining optical system 80. Will be extracted. For this reason, strong light having a uniform light intensity distribution can be obtained. Therefore, it is possible to provide the light source device 2 capable of increasing the brightness.

  Further, according to this configuration, since the first combining optical system 70A includes the polarization separation element 71A and the reflection mirror 72A, the plurality of first lights reflected by the polarization separation element 71A and the polarization separation element 71A are transmitted. The plurality of second lights are synthesized in a complementary manner so as to fill the gaps between each other. In addition, a plurality of first lights transmitted through the polarization separation element 71A and reflected by the reflection mirror 72A and a plurality of second lights reflected by the polarization separation element 71A and reflected by the reflection mirror 72A are mutually spaced. Complementary synthesis to make up for For example, when twelve first light sources per unit area are arranged in the first light source array 10 and twelve second light sources per unit area are arranged in the second light source array 20, the unit area is obtained by the polarization separation element 71A. 24 light is extracted per unit and 24 light per unit area is extracted by the reflecting mirror 72A. For this reason, the light flux taken out per unit area increases. Therefore, the light intensity distribution can be made uniform.

  In addition, according to this configuration, the first light L1, the second light L2, the third light L3, and the fourth light L4 are the same color, and thus have a strong light intensity distribution with the same color. Light can be obtained.

  In the light source device 2 of the present embodiment, the configuration in which the first light, the second light, the third light, and the fourth light are the same color has been described as an example, but the present invention is not limited thereto. . For example, the first light and the second light are blue light, and the third light and the fourth light are also applicable to yellow light. According to this configuration, it is possible to extract strong white light having a uniform light intensity distribution by juxtaposing and mixing blue light and yellow light.

  In the light source device 2 of the present embodiment, the first combining optical system and the second combining optical system include a polarization separation element, and the third combining optical system includes a half mirror. However, the configuration is not limited thereto. For example, the first synthesis optical system and the second synthesis optical system may include a half mirror instead of the polarization separation element, and the third synthesis optical system may include a polarization separation element instead of the half mirror. Further, the first combining optical system and the second combining optical system have a half mirror instead of the polarization separating element, that is, the first combining optical system, the second combining optical system, and the third combining optical system are all half mirrors. May be provided.

(Modification 1)
FIG. 8 is a view showing a first modification of the light source array according to the present invention.
As shown in FIG. 8, the light source array 10A of the present modification includes a base 11A, a plurality of light sources 12A disposed on the base 11A, a phosphor 13A disposed on the plurality of light sources 12A, and a phosphor 13A. And a plurality of collimating lenses 14A arranged on the top.

  The phosphor 13A is disposed apart from the plurality of light sources 12A. Only one phosphor 13A is arranged for each of the plurality of light sources 12A. Each collimating lens 14A is spaced apart from the phosphor 13A. Each parallelizing lens 14A is disposed at a position overlapping each light source 12A.

  Also in this modification, it is possible to provide a light source device capable of achieving high brightness.

  The present invention is applicable not only when applied to a front projection type projector that projects from the side that observes the projected image, but also when applied to a rear projection type projector that projects from the side opposite to the side that observes the projected image. can do.

  In each of the above embodiments, the example in which the light source device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the light source device of the present invention can be applied to other optical devices (for example, an optical disc device, a car headlamp, a lighting device, etc.).

DESCRIPTION OF SYMBOLS 1, 2 ... Light source device, 10 ... 1st light source array, 12 ... 1st light source, 20 ... 2nd light source array, 22 ... 2nd light source, 30 ... 3rd light source array, 40 ... 4th light source array, 50, 70A ... 1st synthetic optical system, 51, 81 ... Half mirror, 52 ... Reflective mirror, 70B ... 2nd synthetic optical system, 71A, 71B ... Polarization separation element, 72A, 72B ... Reflective mirror, 80 ... 3rd synthetic optical system, 110: integrator optical system, 400R, 400G, 400B ... liquid crystal light modulation device (light modulation device), 600 ... projection optical system, 1000 ... projector, L1 ... first light, L2 ... second light, L3 ... third , L4... Fourth light, W1... Arrangement interval of a plurality of first light sources arranged along the first direction, W2... Arrangement of a plurality of first light sources arranged along the second direction. Interval, W3 ... arranged along the third direction Arrangement intervals of the plurality of second light sources, W4 ... arrangement interval of the fourth plurality of second light sources arranged along the direction of

Claims (13)

A first light source array in which a plurality of first light sources emitting the first light are arranged;
A second light source array in which a plurality of second light sources emitting second light are arranged;
A first combining optical system for combining the plurality of first lights emitted by the first light source array and the plurality of second lights emitted by the second light source array so as not to overlap each other;
A light source device comprising: In the first light source array, the plurality of first light sources are arranged along the first direction and are orthogonal to the first direction when viewed from the emission direction of the first light. Arranged along the direction, and
In the second light source array, the plurality of second light sources are arranged along a third direction as viewed from the direction of emission of the second light and are orthogonal to the third direction. The light source device according to claim 1, wherein the light source device is arranged along a direction. The arrangement interval of the plurality of first light sources arranged along the first direction is the same as the arrangement interval of the plurality of first light sources arranged along the second direction, and
The arrangement interval of the plurality of second light sources arranged along the third direction is the same as the arrangement interval of the plurality of second light sources arranged along the fourth direction. The light source device according to claim 2. The arrangement interval of the plurality of first light sources arranged along the first direction is the same as the arrangement interval of the plurality of second light sources arranged along the third direction, and
The arrangement interval of the plurality of first light sources arranged along the second direction is the same as the arrangement interval of the plurality of second light sources arranged along the fourth direction. The light source device according to claim 3. The first light source array and the second light source array are:
A plurality of first lights emitted from a plurality of first light sources arranged along the first direction are emitted from a plurality of second light sources arranged along the third direction. Located at the center of the light emission interval of 2 and
A plurality of first lights emitted from a plurality of first light sources arranged along the second direction are emitted from a plurality of second light sources arranged along the fourth direction. 5. The light source device according to claim 4, wherein the light source device is disposed so as to be positioned at the center of the light emission interval of 2.   The light source device according to claim 1, wherein the first light has the same color as the second light.   The light source device according to claim 1, further comprising an integrator optical system that uniformizes a light intensity distribution of the light combined by the first combining optical system. The first synthetic optical system includes:
Half mirror,
A reflection mirror,
The half mirror transmits half of the plurality of first lights emitted by the first light source array toward the reflection mirror and reflects the other half in a direction different from that of the first light source array. Half of the plurality of second lights emitted by the second light source array is transmitted in the same direction as the reflection direction of the first light reflected by itself, and the other half of the first light transmitted through itself is transmitted. Reflect in the same direction as the transmission direction,
The reflection mirror reflects the first light transmitted through the half mirror in the same direction as the reflection direction of the first light reflected by the half mirror, and reflects the second light reflected by the half mirror. The light source device according to claim 1, wherein the light source device is reflected in the same direction as a reflection direction of the first light reflected by itself. The first synthetic optical system includes:
A polarization separation element;
A reflection mirror,
The polarization separation element separates the plurality of first lights emitted by the first light source array into P-polarized light and S-polarized light and separates one polarization of the first light separated by itself into the reflection mirror. And the other polarized light is reflected in a direction different from that of the first light source array, and the plurality of second lights emitted by the second light source array are separated into P polarized light and S polarized light and separated by themselves. One polarization of the second light thus transmitted is transmitted in the same direction as the reflection direction of the first light reflected by itself, and the other polarization is reflected in the same direction as the transmission direction of the first light transmitted through the second light. Let
The reflection mirror reflects one polarization of the first light transmitted through the polarization separation element in the same direction as a reflection direction of the other polarization of the first light reflected by the polarization separation element; 8. The other polarization of the second light reflected by the polarization separation element is reflected in the same direction as the reflection direction of one polarization of the first light reflected by itself. The light source device according to any one of the above. A third light source array in which a plurality of third light sources emitting third light are arranged;
A fourth light source array in which a plurality of fourth light sources emitting fourth light are arranged;
A second combining optical system for combining the plurality of third lights emitted by the third light source array and the plurality of fourth lights emitted by the fourth light source array so as not to overlap each other;
The plurality of first lights and the plurality of second lights synthesized by the first synthesis optical system and the plurality of third lights and the plurality of fourth lights synthesized by the second synthesis optical system. A third synthesis optical system for synthesizing light so as not to overlap each other;
The light source device according to claim 1, comprising:   The light source device according to claim 10, wherein the first light, the second light, the third light, and the fourth light have the same color. The first light and the second light are blue light; and
The light source device according to claim 10, wherein the third light and the fourth light are yellow 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 optical system that projects modulated light from the light modulation device as a projection image;
A projector comprising:

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