JP2016145966A - Light source device and projection-type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device and a projection-type image display device capable of reducing the size of the device.SOLUTION: A light source device 200 includes: a first light source unit 10A that outputs a beam of blue light in a first direction; a second light source unit 10B that outputs a beam of blue light in a second direction crossing the first direction; a separation/combination mirror 110 that separates and combines the beams of blue light output from the first light source unit 10A and the second light source unit 10B to a first optical path and a second optical path; an emitter which is disposed on the first optical path and emits yellow light Y1 responding to an excitation ray B1; and a dichroic mirror 132 which integrates the first optical path and the second optical path into a single optical path.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a light source device including a light source that emits excitation light and a light emitter that emits emitted light in response to the excitation light, and a projection display apparatus including the light source device.

  Patent Document 1 discloses a projector using a solid light source array as a light source. A pair of the solid light source arrays are provided so as to be opposed to each other, and the lights from the solid light source arrays are synthesized by mirrors and emitted.

Special table 2011-505593

  The present disclosure provides a light source device and a projection-type image display device that can be downsized.

  The light source device according to the present disclosure includes a first light source unit that emits blue light in a first direction, a second light source unit that emits blue light in a second direction that intersects the first direction, and a first light source unit. A separation / synthesis optical element that separates and combines the blue light emitted from the light source unit and the second light source unit into the first optical path and the second optical path, and the emitted light according to the excitation light is provided on the first optical path. A light emitting body that emits light, and a synthetic optical element that combines the first optical path and the second optical path into one optical path.

  According to the present disclosure, it is possible to provide a small light source device and a projection display apparatus while allowing blue light emitted from two light source units to be separated into a first optical path and a second optical path.

FIG. 5 shows a projection display apparatus according to Embodiment 1; (A) Top view and (b) Side view showing phosphor wheel in the first embodiment FIG. 5 illustrates a light source device in Embodiment 1. The figure which shows the (a) 1st light source unit in Embodiment 1, and the (b) 2nd light source unit. The figure which shows the isolation | separation synthetic | combination mirror in Embodiment 1. FIG. The figure which shows the separation | separation synthesis | combination of the light beam in Embodiment 1 The figure which shows the isolation | separation composition mirror in Embodiment 2. The figure which shows the separation | separation synthesis | combination of the light beam in Embodiment 2

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[Embodiment 1]
(Projection-type image display device)
The configuration of the projection display apparatus according to Embodiment 1 will be described below with reference to FIGS. FIG. 1 is a diagram showing a projection display apparatus 100 according to the first embodiment.

  As shown in FIG. 1, first, the projection display apparatus 100 includes a first light source unit 10A, a second light source unit 10B, a phosphor wheel 20, a rod integrator 30, and a DMD (Digital Micromirror). Device) DMD 40 composed of 40R, DMD 40G, and DMD 40B, and projection unit 50 are included.

  The first light source unit 10A and the second light source unit 10B are configured by a plurality of solid light sources such as a laser diode (LD) and a light emitting diode (LED), for example. In this embodiment, a laser diode, particularly a laser diode that emits blue light is used as the solid-state light source. Here, the laser diode is a laser light source and an example of a light emitting element.

  The emitted light from the first light source unit 10A and the second light source unit 10B is, for example, blue light having a wavelength of 440 to 470 nm, and this blue light is also used as excitation light for exciting the phosphor. The details of the first light source unit 10A and the second light source unit 10B will be described later (see FIG. 4).

  The phosphor wheel 20 is configured to rotate around a rotation axis 20X extending along the optical axis of the excitation light. The phosphor wheel 20 is a reflective phosphor wheel that emits emitted light in a direction opposite to the incident direction of excitation light.

  Specifically, as shown in FIGS. 2A and 2B, the phosphor wheel 20 includes a substrate 21, a phosphor 22 formed on the substrate 21 in an annular shape in the rotation direction of the substrate 21, and a fluorescent light It comprises a motor 23 for rotating the substrate 21 on which the body 22 is formed. A reflective film is formed on the surface of the substrate 21 to form a reflective surface, and the phosphor 22 is formed on the reflective surface. The phosphor 22 emits emitted light according to the excitation light emitted from the first light source unit 10A and the second light source unit 10B. Of the yellow light that is the emitted light of the phosphor 22, the light emitted toward the reflecting surface is reflected by the reflecting surface. The phosphor 22 is an example of a light emitter, and the phosphor wheel is an example of a wheel.

  The phosphor 22 is a phosphor that emits fluorescent light in a wavelength range of green to yellow. The phosphor 22 is preferably a phosphor that efficiently absorbs blue excitation light, efficiently emits fluorescence, and has high resistance to temperature quenching. The phosphor 22 is, for example, Y3Al5O12: Ce3 + which is a cerium activated garnet structure phosphor.

  The rod integrator 30 is a solid rod made of a transparent member such as glass. The rod integrator 30 makes the light emitted from the light source unit 10 uniform. The rod integrator 30 may be a hollow rod whose inner wall is constituted by a mirror surface.

  The DMD 40 modulates light emitted from the first light source unit 10 </ b> A, the second light source unit 10 </ b> B, and the phosphor wheel 20. Specifically, the DMD 40 includes a plurality of minute mirrors, and the plurality of minute mirrors are movable. Each micromirror basically corresponds to one pixel. The DMD 40 switches whether to reflect light to the projection unit 50 side by changing the angle of each micromirror.

  In the first embodiment, DMD 40R, DMD 40G, and DMD 40B are provided as DMD 40. The DMD 40R modulates the red component light R based on the red video signal R. The DMD 40G modulates the green component light G based on the green video signal G. The DMD 40B modulates the blue component light B based on the blue video signal B.

  The projection unit 50 projects the image light modulated by the DMD 40 on the projection surface.

  Secondly, the projection display apparatus 100 includes a separation / combination mirror 110. The separation / combination mirror 110 is a mirror that synthesizes the light emitted from the first light source unit 10A and the second light source unit 10B and separates a part thereof. The separating / combining mirror 110 is an example of a separating / combining optical element, and details thereof will be described later (see FIG. 5).

  Further, the projection display apparatus 100 has a necessary mirror group. As the mirror group, mirrors 131 to 133, mirror 160, and mirror 170 are provided. The mirror 131, the mirror 133, the mirror 160, and the mirror 170 are mirrors that bend the optical path. The dichroic mirror 132 is a dichroic mirror having characteristics of transmitting blue light and reflecting yellow light, and is an example of a synthetic optical element.

  The projection display apparatus 100 has a necessary lens group. As the lens group, lenses 121 to 128 and lenses 151 to 153 are provided. The lens 121 is a condenser lens that condenses the emitted light from the first light source unit 10A and the second light source unit 10B. The lens 122 is a concave lens that collimates the light collected by the lens 121. The lens 123 and the lens 124 are condenser lenses that collect excitation light on the phosphor of the phosphor wheel and collimate the light emitted from the phosphor. The lens 125 is a condenser lens that condenses the light emitted from the first light source unit 10A and the second light source unit 10B. The lens 126 is a condenser lens that is disposed after the light condensing point of the lens 125 and collimates the condensed light again. The lens 127 and the lens 128 are relay lenses that guide the emitted light from the first light source unit 10 </ b> A and the second light source unit 10 </ b> B and the emitted light from the phosphor wheel to the rod integrator 30. The lens 151, the lens 152, and the lens 153 are relay lenses that form an image of light emitted from the rod integrator 30 on each DMD 40.

  Further, the projection display apparatus 100 has a necessary diffusing plate group. As the diffusion plate group, a diffusion plate 141 and a diffusion plate 142 are provided. The diffusion plate 141 is a diffusion plate that diffuses incident light as substantially parallel light. The diffusing plate 142 is a diffusing plate that is disposed near the condensing point of the light beam by the lens 125 and diffuses the light beam. The diffusing plate 141 and the diffusing plate 142 have a configuration in which fine irregularities are formed on the surface of a glass substrate, for example. Further, the fine uneven surface may be formed on one side or both sides.

  It should be noted that the light emission point of the emitted light from the phosphor wheel 20 and the incident surface of the rod integrator 30 are substantially conjugated, and the diffusion plate 142 and the incident surface of the rod integrator 30 are substantially conjugated. The shape has been adjusted.

  Thirdly, the projection display apparatus 100 has a necessary prism group. As the prism group, a prism 210, a prism 220, a prism 230, a prism 240, and a prism 250 are provided.

  The prism 210 is made of a translucent member and has a surface 211 and a surface 212. An air gap is provided between the prism 210 (surface 211) and the prism 250 (surface 251), and the angle at which light incident on the prism 210 enters the surface 211 (incident angle) is larger than the total reflection angle. Therefore, the light incident on the prism 210 is reflected by the surface 211. On the other hand, an air gap is provided between the prism 210 (surface 212) and the prism 220 (surface 221). The angle at which the light reflected by the surface 211 is incident on the surface 212 (incident angle) is the total reflection angle. The light reflected by surface 211 passes through surface 212.

  The prism 220 is made of a translucent member and has a surface 221 and a surface 222. The surface 222 is a dichroic mirror surface that transmits the red component light R and the green component light G and reflects the blue component light B. Accordingly, among the light reflected by the surface 211, the red component light R and the green component light G pass through the surface 222, and the blue component light B is reflected by the surface 222. The blue component light B reflected by the surface 222 is reflected by the surface 221 and enters the DMD 40B. The red component light R emitted from the DMD 40R and the green component light G emitted from the DMD 40G pass through the surface 222 and the surface 221.

  An air gap is provided between the prism 210 (surface 212) and the prism 220 (surface 221), and the blue component light B first reflected by the surface 222 and the blue component light B emitted from the DMD 40B are surfaces. Since the angle incident on 221 (incident angle) is larger than the total reflection angle, the blue component light B first reflected by the surface 222 and the blue component light B emitted from the DMD 40B are reflected by the surface 221. On the other hand, since the angle (incident angle) at which the blue component light B reflected on the surface 221 for the second time after being reflected on the surface 221 is incident on the surface 221 is smaller than the total reflection angle, after being reflected on the surface 221 The blue component light B reflected at the surface 222 for the second time passes through the surface 221.

  The prism 230 is made of a translucent member and has a surface 231 and a surface 232. The surface 232 is a dichroic mirror surface that transmits the green component light G and reflects the red component light R. Accordingly, among the light transmitted through the surface 231, the green component light G is transmitted through the surface 232, and the red component light R is reflected by the surface 232. The red component light R reflected by the surface 232 is reflected by the surface 231 and enters the DMD 40R. The green component light G emitted from the DMD 40G passes through the surface 232 and the surface 231.

  An air gap is provided between the prism 220 (surface 222) and the prism 230 (surface 231). The red component light R transmitted through the surface 231 and reflected by the surface 232 and the red component emitted from the DMD 40R. Since the angle (incident angle) at which the light R again enters the surface 231 is larger than the total reflection angle, the red component light R transmitted through the surface 231 and reflected by the surface 232 and the red component light R emitted from the DMD 40R are Reflected by the surface 231. On the other hand, since the angle (incident angle) at which the red component light R emitted from the DMD 40R and reflected by the surface 231 and then reflected by the surface 232 is incident on the surface 231 again is smaller than the total reflection angle, it is emitted from the DMD 40R. Then, the red component light R reflected by the surface 232 after being reflected by the surface 231 passes through the surface 231.

  The prism 240 is made of a translucent member and has a surface 241. The surface 241 is configured to transmit the green component light G. The green component light G incident on the DMD 40G and the green component light G emitted from the DMD 40G are transmitted through the surface 241.

  The prism 250 is made of a translucent member and has a surface 251.

  In other words, the blue component light B is (1) reflected by the surface 211, (2) transmitted through the surface 212 and the surface 221, reflected by the surface 222, and (3) reflected by the surface 221. (4) Reflected by the DMD 40B, (5) reflected by the surface 221 and (6) reflected by the surface 222, and (7) transmitted through the surface 221, the surface 212, the surface 211, and the surface 251. As a result, the blue component light B is modulated by the DMD 40 </ b> B and guided to the projection unit 50.

  The red component light R is (1) reflected on the surface 211, (2) transmitted through the surface 212, the surface 221, the surface 222, and the surface 231, reflected on the surface 232, and (3) reflected on the surface 231. (4) Reflected by DMD 40R, (5) Reflected by surface 231, (6) Reflected by surface 232, (7) Surface 231, Surface 232, Surface 221, Surface 212, Surface 211 and The surface 251 is transmitted. As a result, the red component light R is modulated by the DMD 40 </ b> R and guided to the projection unit 50.

  The green component light G is (1) reflected by the surface 211, (2) transmitted through the surface 212, the surface 221, the surface 222, the surface 231, the surface 232, and the surface 241, and then reflected by the DMD 40G. ) The surface 241, the surface 232, the surface 231, the surface 222, the surface 221, the surface 212, the surface 211, and the surface 251 are transmitted. Accordingly, the green component light G is modulated by the DMD 40G and guided to the projection unit 50.

(Light source device)
Hereinafter, the light source device according to Embodiment 1 will be described with reference to FIGS. FIG. 3 is a diagram showing the light source device 200 according to the first embodiment.

  The light source device 200 used in the projection display apparatus 100 shown in FIG. 1 is mainly composed of the first light source unit 10A, the second light source unit 10B, the separation / combination mirror 110, and the phosphor wheel 20. . The light source device 200 includes necessary lens groups and mirror groups. Since these components and their descriptions are the same as those described in the projection display apparatus 100, further redundant description is omitted.

  4A is a view of the first light source unit 10A as viewed in the −z direction of FIG. 1, and FIG. 4B is a view of the second light source unit 10B in the −x direction of FIG. FIG.

  The first light source unit 10A includes light source blocks 12B1 and 12B2 each including a plurality of laser diodes 11B1 and 11B2 that emit blue light, and a heat sink 13, and the second light source unit 10B includes a plurality of light sources that emit blue light. The light source block 12B1 including the laser diode 11B1 and the heat sink 13. The laser diodes 11B1 and 11B2 are collectively referred to as a laser diode 11, and the light source blocks 12B1 and 12B2 are collectively referred to as a light source block 12.

  10 A of 1st light source units are comprised by the three light source blocks 12, and the light source block 12B1 is arrange | positioned at the upper part and the lower part, and the light source block 12B2 is arrange | positioned in the center part. On the other hand, the second light source unit 10B is composed of three identical light source blocks 12B1.

  For convenience of explanation, the upper and lower light source blocks 12B1 and 12B1 of the first light source unit 10A and the three light source blocks 12B1 of the second light source unit 10B and the light source block 12B2 at the center of the first light source unit 10A are provided. , Different symbols are attached. Laser diode 11B2 is shown by a broken line, and in the first embodiment, laser diode 11B1 and laser diode 11B2 are also given different symbols for convenience of explanation, but have the same characteristics (wavelength is 455 nm). is there.

  The light source block 12B1 has a configuration in which a total of eight laser diodes 11B1 are arranged, four in the horizontal direction and two in the vertical direction. The light source block 12B2 has a configuration in which a total of eight laser diodes 11B2 are arranged, four in the horizontal direction and two in the vertical direction.

  The laser diode 11 is integrated with a collimating lens that collimates the emitted light, and substantially parallel light is emitted from the laser diode 11.

  The heat sink 13 is bonded to the back surface of the light source block through, for example, thermally conductive grease.

  As shown in FIG. 5, the separation / combination mirror 110 has a configuration in which a reflection region 112 (hatched portion) and transmission regions 113 a and 113 b (shaded portions) are formed on a substrate 111. . The substrate 111 is, for example, a glass substrate. In the reflective region 112, a reflective film that reflects the emitted light from the first light source unit 10A and the second light source unit 10B is formed. In the transmissive regions 113a and 113b, an antireflection film is formed so that light emitted from the first light source unit 10A and the second light source unit 10B is transmitted. It is desirable to form an antireflection film on the back side of the substrate 111 as well.

  Here, the separation / combination operation by the separation / combination mirror 110 will be described with reference to FIG.

  As shown in FIG. 6, the first light source unit 10A emits blue light in the z direction (first direction), and the second light source unit 10B emits in the x direction (second direction). As described above, the first light source unit 10A and the second light source unit 10B are arranged so that the respective emission directions, that is, the first direction and the second direction intersect at 90 °. The separation / combination mirror 110 is disposed at an angle with respect to the emission direction of the blue light from the first light source unit 10A and the second light source unit 10B in this intersection region.

  Of the light emitted from the first light source unit 10 </ b> A, the light emitted from the laser diode 11 </ b> B <b> 1 constituting the light source block 12 </ b> B <b> 1 is reflected by the reflection region 112 of the separation / combination mirror 110.

  On the other hand, of the light emitted from the first light source unit 10A, the light emitted from the laser diode 11B2 constituting the light source block 12B2 (indicated by a broken line arrow) is a transmission region 113a (not shown in FIG. 6) of the separation / combination mirror 110 Transparent.

  The light emitted from the second light source unit 10B is all light emitted from the laser diode 11B1 constituting the light source block 12B1, and passes through the transmission region 113b of the separation / combination mirror 110.

  At this time, as shown in FIG. 6, out of the light emitted from the first light source unit 10A, the light beam reflected by the separation / combination mirror 110 and the light emitted from the second light source unit 10B pass through the separation / combination mirror 110. The transmitted light beams are alternately arranged. This is because the separation / combination mirror 110 is selectively formed with a reflection region and a transmission region corresponding to the positions of the plurality of outgoing light beams from the first light source unit 10A and the second light source unit 10B. it can.

  Returning to FIG. 3, the luminous fluxes of the emitted light from the first light source unit 10 </ b> A and the second light source unit 10 </ b> B are converted into excitation light B <b> 1 for exciting the phosphor wheel 20 and image light by the separation / combination mirror 110. The blue light B2 used is separated and synthesized.

  The blue light synthesized by the blue light from the first light source unit 10A and the blue light from the second light source unit 10B separated by reflection by the separation / combination mirror 110 becomes the excitation light B1. The excitation light B1 passes through an optical path (first optical path) including paths of the lens 121, the mirror 131, the lens 122, the diffusion plate 141, the dichroic mirror 132, the lens 123, the lens 124, and the phosphor wheel 20. Thereby, the excitation light B1 is irradiated to the phosphor 22 of the phosphor wheel 20, and emits yellow light Y1.

  On the other hand, part of the blue light from the first light source unit 10A passes through the separation / combination mirror 110 and becomes blue light B2. The blue light B2 passes through an optical path (second optical path) including paths of the lens 125, the mirror 160, the diffusion plate 142, the lens 126, and the dichroic mirror 132. The yellow light Y1 and the blue light B2 are combined by the dichroic mirror 132 (that is, the first optical path and the second optical path are combined into one optical path) and emitted as white light.

(Function and effect)
In the first embodiment, excitation is performed by separating a plurality of blue light beams emitted from the first light source unit 10A and the second light source unit 10B into a first optical path and a second optical path by the separation / combination mirror 110. Blue light can be used as both light and video light.

  In the first embodiment, for the purpose of increasing the brightness of the projection display apparatus using a plurality of laser diodes, the light emitted from the plurality of laser diodes is separated by a single separating / combining mirror into the first optical path and the first optical path. By having the function of separating and synthesizing into two optical paths, the light source device can be reduced in size and simplified.

[Embodiment 2]
Hereinafter, the second embodiment will be described with reference to FIGS. 7 and 8. FIG. In the following, differences from the first embodiment will be mainly described, and the others are the same as those in the first embodiment. The light source device 201 and the projection display apparatus 101 according to the second embodiment include a separation / combination mirror 120 instead of the separation / combination mirror 110 described in the first embodiment.

  FIG. 7 is a diagram illustrating the separation / combination mirror 120 according to the second embodiment. In the first embodiment, the separation / combination mirror 110 has the reflection region 112 and the transmission regions 113a and 113b. However, in the second embodiment, the separation / combination mirror 120 has the polarization mirror region 114 and the transmission region 113. . The polarizing mirror region 114 is a polarizing mirror film that reflects S-polarized light and transmits P-polarized light. In the second embodiment, the polarizing mirror region 114 in the separation / combination mirror 120 is light emitted from the light source block 12B1 above and below the first light source unit 10A and the second light source unit 10B (see FIG. 4). The transmission region 113 corresponds to light emitted from the light source blocks 12B1 and 12B2 at the center of the first light source unit 10A and the second light source unit 10B.

  The separation / combination operation by the separation / combination mirror 120 in the second embodiment will be described with reference to FIG.

  In the second embodiment, the emitted light from the first light source unit 10A and the second light source unit 10B is S-polarized light (the polarization direction is the y direction) with respect to the separation / combination mirror 120. In the second embodiment, the half-wave plate 310 is disposed between the second light source unit 10B and the separation / combination mirror 120. Therefore, the light emitted from the second light source unit 10B passes through the half-wave plate 310 and becomes P-polarized light (the polarization direction is the z direction) (indicated by a one-dot chain line).

  Of the light emitted from the first light source unit 10A, the light emitted from the laser diode 11B1 constituting the upper and lower light source blocks 12B1 is S-polarized light and is reflected by the polarizing mirror region 114 of the separation / combination mirror 120. .

  On the other hand, of the light emitted from the first light source unit 10A, the light emitted from the laser diode 11B2 constituting the light source block 12B2 at the center (shown by a broken line arrow) is transmitted through the transmission region 113 of the separation / combination mirror 110. .

  The outgoing light from the second light source unit 10B is S-polarized light, is converted to P-polarized light by the half-wave plate 310, and is transmitted through the polarizing mirror region 114 and the transmission region 113.

  In the second embodiment, the polarization direction is adjusted by arranging the half-wave plate 310. However, the second light source unit 10B is configured in advance so that the polarization direction becomes a desired direction. The orientation of the light source block 12B1 or the orientation of the laser diode 11B1 may be adjusted.

(Function and effect)
In the second embodiment, a plurality of blue light beams emitted from the first light source unit 10A and the second light source unit 10B are separated into a first optical path and a second optical path by a separation / combination mirror 120 using a polarizing mirror film. By separating, blue light can be used as both excitation light and image light.

  In the second embodiment, for the purpose of increasing the brightness of the projection display apparatus using a plurality of laser diodes, the light emitted from the plurality of laser diodes is separated by a single separating / combining mirror into the first optical path and the first optical path. By having the function of separating and synthesizing into two optical paths, the light source device can be reduced in size and simplified.

[Other Embodiments]
As described above, the embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments that have been changed, replaced, added, omitted, and the like. Moreover, it is also possible to combine each component demonstrated in the said embodiment and it can also be set as a new embodiment. Therefore, other embodiments will be exemplified below.

  In the above embodiment, three DMDs 40R, 40G, and 40B are illustrated as the light modulation elements, but the embodiment is not limited to this. The light modulation element may be one DMD. Alternatively, the light modulation element may be one liquid crystal panel or three liquid crystal panels (a red liquid crystal panel, a green liquid crystal panel, and a blue liquid crystal panel). The liquid crystal panel may be transmissive or reflective.

  In the first embodiment and the second embodiment, the wavelengths of the emitted light from the laser diode 11B1 and the laser diode 11B2 are the same at 455 nm, but the embodiment is not limited to this. The laser diode 11B1 and the laser diode 11B2 may have different wavelengths in the blue band (440 to 470 nm). In this case, for example, the laser diode 11B1 used in the upper and lower portions of the first light source unit 10A and the three light source blocks 12B1 of the second light source unit 10B emits light having a wavelength suitable for exciting the phosphor. Use a material that emits light. On the other hand, the laser diode 11B2 used in the light source block 12B2 in the central portion of the first light source unit 10A has a characteristic of emitting blue light that can obtain a preferable color when used as video light. For example, the wavelength of blue light as excitation light can be set to 445 nm, and the wavelength of blue light as image light can be set to 465 nm.

  In the first embodiment and the second embodiment, the phosphor wheel 20 is exemplified as the light emitter that generates the reference light. However, the embodiment is not limited to this. The light emitter may be a static inorganic phosphor ceramic. Alternatively, the light emitter may be a phosphor.

  In the first embodiment and the second embodiment, the separation / combination mirrors 110 and 120 are exemplified, but the formation pattern of the reflection region 112, the transmission regions 113, 113a, 113b, and the polarization mirror region 114 is not limited to this. Absent. For example, the transmission regions 113a and 113 of the separation / combination mirrors 110 and 120 shown in FIGS. 5 and 7 may be the upper part or the lower part instead of the central part.

  In the first embodiment and the second embodiment, an example in which the blue light emitted from the first light source unit 10A is separated into the first optical path and the second optical path by the separation / combination mirrors 110 and 120 has been described. However, the blue light emitted from the second light source unit 10B can be separated into the first optical path and the second optical path. Further, both blue light emitted from the first light source unit 10A and the second light source unit 10B is separated into a first optical path and a second optical path, respectively, and both blue lights are separated into a first optical path and a second optical path. It is also possible to synthesize each of these. In this case, for example, it can be realized by forming a reflection region in a part of the transmission region 113b shown in FIG. In FIG. 8, part of the light emitted from the second light source unit 10 </ b> B may not be transmitted through the half-wave plate 310.

  The above-described embodiments are for illustrating the technique in the present disclosure, and various modifications, replacements, additions, omissions, and the like can be made within the scope of the claims and their equivalents.

  The present disclosure can be applied to a projection display apparatus such as a projector.

10A First light source unit 10B Second light source unit 11, 11B1, 11B2 Laser diode 12, 12B1, 12B2 Light source block 13 Heat sink 20 Phosphor wheel 21 Substrate 22 Phosphor 30 Rod integrator 40, 40R, 40G, 40B DMD
50 Projection unit 100, 101 Projection-type image display device 110, 120 Separation / combination mirror 111 Substrate 112 Reflection area 113, 113a, 113b Transmission area 114 Polarization mirror area 121, 122, 123, 124, 125, 126, 127, 128 Lens 131 , 133 Mirror 132 Dichroic mirror 141, 142 Diffuser plate 151, 152, 153 Lens 160, 170 Mirror 200, 201 Light source device 210, 220, 230, 240, 250 Prism 310 ½ wavelength plate

Claims (8)

A first light source unit that emits blue light in a first direction;
A second light source unit that emits blue light in a second direction that intersects the first direction;
A separation / synthesis optical element that separates and combines the blue light emitted from the first light source unit and the second light source unit into a first optical path and a second optical path;
A light emitter that is provided on the first optical path and emits emitted light in response to excitation light;
A light source device comprising: a combining optical element that combines the first optical path and the second optical path into one optical path. Each of the first light source unit and the second light source unit includes a plurality of light source blocks in which a plurality of light emitting elements are arranged,
2. The blue light emitted from at least one of the plurality of light source blocks constituting the first light source unit and the second light source unit is separated into the second optical path. Light source device.   The light source device according to claim 1, wherein each of the blue lights separated into the first optical path and the second optical path has a different wavelength.   The separation / synthesis optical element separates the blue light emitted from the first light source unit into the first optical path and the second optical path, and emits the blue light from the first light source unit into the first optical path. The light source device according to claim 1, wherein the blue light emitted and the blue light emitted from the second light source unit are combined.   2. The light source device according to claim 1, wherein the combining optical element combines the emitted light in the first optical path and the blue light in the second optical path into one optical path.   The separation / synthesis optical element is an optical mirror in which a reflection region and a transmission region are selectively formed corresponding to the positions of a plurality of outgoing light beams from the first light source unit and the second light source unit. The light source device according to claim 1, wherein the light source device is disposed to be inclined with respect to an emission direction of the blue light emitted from the first light source unit and the second light source unit.   The separation / combination optical element is an optical mirror in which a polarization mirror region and a transmission region are selectively formed corresponding to the positions of a plurality of outgoing light beams from the first light source unit and the second light source unit. The light source device according to claim 1, wherein the light source device is inclined with respect to an emission direction of the blue light emitted from the first light source unit and the second light source unit.   A projection display apparatus comprising the light source device according to claim 1.

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