Light source device and projector

Abstract

To suppress an increase in the size of a light source device for a projector.SOLUTION: A light source device includes: a first light source that emits first light of a first wavelength band; a second light source that emits second light of a second wavelength band different from the first wavelength band in parallel to the first light; a light conversion element that converts the incident first light into third light of a third wavelength band different from the first wavelength band; a light flux reduction optical system that reduces a distance between a principal ray of the first light emitted from the first light source and a principal ray of the second light emitted from the second light source; and a light guiding optical system that guides the first light and the second light emitted from the light flux reduction optical system to the light conversion element. The light guiding optical system reflects the first light, the second light, and the third light emitted from the light conversion element.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a light source device and a projector. [Background technology]

[0002] For example, a projector is used as a display device that enlarges and displays an image on a display surface such as a screen. The projector includes a light source device that emits color light, a light modulation device that modulates the color light emitted from the light source device based on image information to generate image light, and a projection optical system that projects the image light emitted from the light modulation device onto the display surface.

[0003] An example of a light source device for a projector is disclosed in Patent Document 1. The light source device disclosed in Patent Document 1 includes a first blue laser light source that emits blue light as excitation light for a phosphor, a phosphor that is excited by the excitation light to emit yellow light, a red laser light source that emits red light, a first light combining unit that combines the yellow light and the red light to emit a first light, a second blue laser light source that emits blue light as a second light different from the blue light as the excitation light, and a second light combining unit that combines the first light emitted from the first light combining unit and the second light emitted from the blue laser light source to emit white light. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-224304 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the light source device disclosed in Patent Document 1, the optical paths of the blue light emitted from the first blue laser light source to be incident on the phosphor and the yellow light emitted from the excited phosphor, and the optical paths of the red light emitted from the red laser light source to be synthesized into the yellow light are provided separately and do not overlap with each other. Therefore, in the light source device disclosed in Patent Document 1, it is necessary to provide the optical path of the blue light, which is the excitation light, and the optical paths of the yellow light and red light other than the excitation light in different regions, which may increase the size of the light source device. In other words, a measure is desired to prevent the size of a light source device having a phosphor, a light source that emits excitation light that excites the phosphor, and another light source that emits colored light. [Means for solving the problem]

[0006] A light source device according to one embodiment of the present invention includes a first light source that emits a first light in a first wavelength band, a second light source that emits a second light in a second wavelength band different from the first wavelength band in parallel to the first light, a light conversion element that converts the incident first light into a third light in a third wavelength band different from the first wavelength band, and a light conversion element that converts the first light emitted from the first light source into a third light in a third wavelength band different from the first wavelength band. Chief ray and the second light emitted from the second light source Chief ray and a light guiding optical system that guides the first light and the second light emitted from the light beam reduction optical system to the light conversion element. The light guiding optical system reflects the first light, the second light, and the third light emitted from the light conversion element. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a projector according to a first embodiment. [Diagram 2] 2 is a schematic diagram of a light source device of the projector in FIG. [Diagram 3] 3 is a perspective view of a portion of the light source device of FIG. 2. [Figure 4] 3 is a schematic diagram of a wavelength conversion device of the light source device of FIG. 2. [Diagram 5] FIG. 5 is a cross-sectional view of the wavelength converter of FIG. [Figure 6] FIG. 5 is a cross-sectional view of the wavelength converter of FIG. [Figure 7] 3 is a graph showing an example of a light intensity distribution of color light emitted from a wavelength conversion device of the light source device of FIG. [Figure 8] 3 is a graph showing an example of the reflectance characteristics of a wavelength selective reflection layer of the light source device of FIG. 2. [Figure 9] FIG. 11 is a schematic diagram of an optical device according to a second embodiment. [Figure 10] 10 is a perspective view of a portion of the light source device of FIG. 9. [Figure 11] 10 is a graph showing an example of the transmittance characteristics of a dichroic mirror that constitutes the light guiding optical system of the light source device in FIG. [Figure 12] 10 is a schematic diagram of a wavelength conversion device of the light source device of FIG. [Figure 13] FIG. 13 is a cross-sectional view of the wavelength converter of FIG. [Figure 14] 10 is a schematic diagram of a wavelength conversion device which is a modified example of the light source device in FIG. [Figure 15] FIG. 15 is a cross-sectional view of the wavelength converter of FIG. [Figure 16] FIG. 15 is a cross-sectional view of the wavelength converter of FIG. [Figure 17] 10 is a schematic diagram of a portion of a modified example of the light source device in FIG. [Figure 18] 3 is a schematic diagram of a modified example of the light source device in FIG. 2. [Figure 19] 19 is a schematic diagram of optical elements that constitute the light guiding optical system of the light source device of FIG. 18. [Figure 20] 3 is a schematic diagram of optical elements that configure a light-guiding optical system of another modified example of the light source device of FIG. 2. [Figure 21] 21 is a graph showing an example of the transmittance characteristics of a wavelength selective transmission film of the optical element of FIG. 20. [Figure 22] 3 is a schematic diagram of another modified example of the light source device in FIG. 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, the scale of the dimensions of some components may be changed in order to make each component easier to see.

[0009] (First embodiment) First, a first embodiment of the present invention will be described with reference to Figs. 1 to 8. Fig. 1 is a schematic diagram showing a configuration of a projector 10 according to the first embodiment of the present invention. The projector 10 is a projection-type display device that displays an image or video on a screen SCR. The projector 10 includes a light source device 110, a color separation optical system 200, field lenses 300R, 300G, and 300B, light modulation devices 400R, 400G, and 400B, a color synthesis optical system 500, and a projection optical system 600. The projector 10 is a three-plate projector having three light modulation devices.

[0010] The light source device 110 emits blue light BL, green light GL, and red light RL toward the color separation optical system 200. The red light RL, green light GL, and blue light BL are illumination lights in the projector 10. In the following description, the blue light BL, green light GL, and red light RL emitted from the light source device 110 may be collectively referred to as colored light. The configuration of the light source device 110 will be described later. The green light GL includes at least one of green lights GL1, GL2, and GL3, which will be described later.

[0011] The color separation optical system 200 separates the incident red light RL, green light GL, and blue light BL into individual optical paths. The color separation optical system 200 includes, for example, dichroic mirrors 210 and 220, total reflection mirrors 230, 240, and 250, and relay lenses 260 and 270.

[0012] The dichroic mirror 210 is disposed on the optical path of the colored light emitted from the light source device 110, and separates the incident colored light into red light RL, green light GL, and blue light BL. For example, the dichroic mirror 210 transmits the red light RL and reflects the green light GL and blue light BL. The dichroic mirror 220 is disposed on the common optical path of the green light GL and blue light BL emitted from the dichroic mirror 210, and separates the green light GL and the blue light BL. For example, the dichroic mirror 220 transmits the blue light BL and reflects the green light GL.

[0013] The total reflection mirror 230 reflects the red light RL toward the light modulation device 400R. The total reflection mirrors 240 and 250 guide the blue light BL to the light modulation device 400B. The green light GL is reflected from the dichroic mirror 220 toward the light modulation device 400G. The red light RL, the green light GL, and the blue light BL correspond to the light emitted from the light source device 110.

[0014] The relay lens 260 is disposed on the optical path of the blue light BL between the dichroic mirror 220 and the total reflection mirror 240. The relay lens 270 is disposed on the optical path of the blue light BL between the total reflection mirror 240 and the total reflection mirror 250. The optical path length of the blue light BL from the dichroic mirror 210 to the optical modulation device 400B is longer than the optical path length of the red light RL from the dichroic mirror 210 to the optical modulation device 400R and the optical path length of the green light GL from the dichroic mirror 210 to the optical modulation device 400G. Therefore, if a relay lens is not disposed on the optical path of the blue light BL, the optical loss of the blue light BL is larger than the optical losses of the red light RL and the green light GL. By disposing the relay lenses 260 and 270 as described above, the optical loss of the blue light BL is compensated.

[0015] The light modulation device 400R is disposed on the optical path of the red light RL reflected by the total reflection mirror 230 and emitted from the total reflection mirror 230. The light modulation device 400R modulates the incident red light RL in accordance with image information input from an image input device (not shown), forms red image light, and emits the red image light. For example, a personal computer or a portable terminal device is used as the image input device.

[0016] The light modulation device 400G is disposed on the optical path of the green light GL reflected by the dichroic mirror 220 and emitted from the dichroic mirror 220. The light modulation device 400G modulates the incident green light GL in accordance with image information input from the image input device described above, forms green image light, and emits the green image light.

[0017] The light modulation device 400B is disposed on the optical path of the blue light BL reflected by the total reflection mirror 250 and emitted from the total reflection mirror 250. The light modulation device 400B modulates the incident blue light BL in accordance with image information input from the image input device described above, forms blue image light, and emits the blue image light.

[0018] Each of the light modulation devices 400R, 400G, and 400B uses, for example, a transmissive liquid crystal panel. Polarizing plates (not shown) are arranged in the incident side area and the exit side area of ​​the liquid crystal panel. The field lens 300R is arranged on the optical path of the red light RL between the total reflection mirror 230 and the polarizing plate on the incident side of the light modulation device 400R. The field lens 300G is arranged on the optical path of the green light GL between the dichroic mirror 220 and the polarizing plate on the incident side of the light modulation device 400G. The field lens 300B is arranged on the optical path of the blue light BL between the total reflection mirror 250 and the polarizing plate on the incident side of the light modulation device 400B.

[0019] The color synthesis optical system 500 is disposed in an area where the optical path of the red image light emitted from the light modulation device 400R, the optical path of the green image light emitted from the light modulation device 400G, and the optical path of the blue image light emitted from the light modulation device 400B intersect. That is, when viewed from the top or side as shown in FIG. 1, the positions through which the colored light passes in the color synthesis optical system 500 overlap at the positions where the optical paths of the red image light, the green image light, and the blue image light intersect with each other. The color synthesis optical system 500 outputs the incident red image light, green image light, and blue image light in the same direction, and guides each image light to the same optical path to synthesize them. The image light of each color emitted from the color synthesis optical system 500 corresponds to the light modulated by the light modulation devices 400R, 400G, and 400B. For example, a cross dichroic prism is used for the color synthesis optical system 500.

[0020] The projection optical system 600 is disposed on the optical path of the image light of each color emitted from the color synthesis optical system 500. The projection optical system 600 enlarges and projects the image light of each color emitted from the color synthesis optical system 500 and incident thereon toward the screen SCR. The projection optical system 600 is configured, for example, by a plurality of optical lenses, but may be configured by a single optical lens. The optical lens includes various lenses, such as a plano-convex lens, a biconvex lens, a meniscus lens, an aspheric lens, a rod lens, and a free curved lens.

[0021] The image light of each color projected in an enlarged scale from the projection optical system 600 is displayed on the screen SCR on a display surface facing the emission surface of the projection optical system 600 and the emission port of the image light in the projector 10. On the screen SCR, the red image light, the green image light, and the blue image light are displayed at separate emission times according to a predetermined emission time at which the red light RL, the green light GL, and the blue light BL emitted from the light source device 110 are switched. Since the predetermined emission time is set shorter than the time resolution of a human observer, the red, green, and blue image lights are synthesized by the afterimage effect, and the observer visually recognizes the image light of each color as a full-color image.

[0022] Next, the light source device 110 according to the first embodiment of the present invention will be described. FIG. 2 is a schematic diagram of the light source device 110 included in the projector 10 of FIG. 1. As shown in FIG. 2, the light source device 110 includes a first light source 11, a second light source 12, a wavelength conversion device 50A, a light beam reduction optical system 130, and a light guide optical system 45, and further includes a homogenizing element 40, a lens 81, a reflection optical system 173, a superimposing lens 82, and a rod lens 85. In the following description, the direction corresponding to the height direction when the light source device 110 is viewed in a plane is defined as the Z direction. One direction perpendicular to the Z direction is defined as the X direction, and the direction perpendicular to the Z direction and the X direction is defined as the Y direction. One side of the X direction is defined as the -X side, and the other side of the X direction is defined as the +X side. One side of the Y direction is defined as the -Y side, and the other side of the Y direction is defined as the +Y side. One side of the Z direction is defined as the -Z side, and the other side of the Z direction is defined as the +Z side.

[0023] FIG. 3 is a perspective view of the first light source 11, the second light source 12, and the condenser element 36 of the light beam reduction optical system 130 of the light source device 110. In FIG. 3, the contour lines of each light source are omitted. As shown in FIG. 2 and FIG. 3, the first light source 11 emits blue light BL in a blue wavelength band including at least a wavelength belonging to blue in the visible wavelength band to the +X side along the X direction. The blue light BL corresponds to the first light. The blue wavelength band corresponds to the first wavelength band, and is, for example, a wavelength band of 420 nm to 500 nm. In the schematic diagram showing the overall configuration of the optical device such as FIG. 2, the blue light BL and red light RL described later are shown as main rays.

[0024] The first light source 11 has a plurality of light sources 21 and the same number of collimating elements 25 as the light sources 21. The plurality of light sources 21 are arranged at intervals along the Y direction and the Z direction in a plane including the Y direction and the Z direction with the emission surface facing the +X side, and are disposed at the same positions as each other in the Y direction and the Z direction. The light source 21 emits blue light BL along the X direction to the +X side. The blue light BL is diverged from the emission surface of the light source 21 with the X direction as the center. The number of light sources 21 included in the first light source 11 is appropriately set according to the ratio between the light amount required for the blue light BL emitted from the light source device 110 toward the color separation optical system 200 and the light amount of the blue light BL emitted from one light source 21. The light source 21 is, for example, a laser diode (LD) that emits blue light BL.

[0025] One of the multiple collimating elements 25 is disposed so as to correspond to one of the multiple light sources 21. One collimating element 25 is disposed on the optical path of the blue light BL emitted from one light source 21. One collimating element 25 is disposed on the +X side of one light source 21 in the X direction, and disposed at a position overlapping with one light source 21 in the Y direction and the Z direction. The entrance surface of the collimating element 25 faces the exit surface of the light source 21. The collimating element 25 receives light from the light source 21. X direction The blue light BL emitted in a radially diverging state centered on an optical axis parallel to the X direction is collimated, and the collimated blue light BL is emitted to the +X side along the X direction.

[0026] The parallelizing element 25 is, for example, a plano-convex lens that faces a convex curved surface toward the emission side of the blue light BL. Note that the parallelizing element 25 is an optical element that can parallelize the incident blue light BL as described above, and is not limited to a plano-convex lens, and may be, for example, a biconvex lens, or may be an optical element other than a plano-convex lens or a biconvex lens.

[0027] In the first light source 11, one light source 21 and the collimating element 25 arranged corresponding to the one light source 21 may be integrated into one package.

[0028] The second light source 12 is disposed at a position overlapping with the first light source 11 in the X direction, and is disposed at a distance from the first light source 11 in a plane including the Y direction and the Z direction. The second light source 12 emits red light RL in a red wavelength band including at least wavelengths belonging to red in the visible wavelength band, toward the +X side along the X direction. The red light RL corresponds to the second light. The red wavelength band corresponds to the second wavelength band, and is different from the blue wavelength band, and is, for example, a wavelength band of 610 nm to 700 nm.

[0029] The second light source 12 has a plurality of light sources 22 and the same number of collimating elements 26 as the light sources 22. The light sources 22 are arranged at intervals along the Z direction in the same plane as the arrangement plane of the plurality of first light sources 11 including the Y direction and the Z direction, with the emission surface facing the +X side, and are arranged at the same positions as each other in the Z direction. The light sources 22 are arranged at positions different from the light sources 21 of the first light source 11 in the Y direction, for example, between some light sources 21 and the remaining light sources 21 of the plurality of light sources 21. The light source 22 emits red light RL to the +X side along the X direction. The red light RL is diverged from the emission surface of the light source 22 with the X direction as the center. The number of light sources 22 included in the second light source 12 is appropriately set according to the ratio between the light amount required for the red light RL in the light source device 110 and the light amount of the red light RL emitted from one light source 22. The light source 22 is, for example, an LD that emits red light RL.

[0030] One of the multiple collimating elements 26 is disposed so as to correspond to one of the multiple light sources 22. One collimating element 26 is disposed on the optical path of the red light RL emitted from one light source 22. One collimating element 26 is disposed on the +X side of one light source 22 in the X direction, and is disposed at a position overlapping with one light source 22 in the Y direction and the Z direction. The entrance surface of the collimating element 26 faces the exit surface of the light source 22. The collimating element 26 is disposed so as to receive the red light RL from the light source 22. X direction The red light RL emitted in a radially diverging state centered on an optical axis parallel to the X direction is collimated, and the collimated red light RL is emitted toward the +X side along the X direction.

[0031] The parallelizing element 26 is, for example, a plano-convex lens that faces a convex curved surface toward the emission side of the red light RL. Note that the parallelizing element 26 is an optical element that can parallelize the incident red light RL as described above, and is not limited to a plano-convex lens, and may be, for example, a biconvex lens, or may be an optical element other than a plano-convex lens or a biconvex lens.

[0032] In the second light source 12, similarly to the first light source 11, one light source 22 and a collimating element 26 arranged corresponding to one light source 22 may be integrated into one package. Moreover, the multiple light sources 21, 22 and the multiple collimating elements 25, 26 may be integrated on a common substrate (not shown) or the like and packaged as one array light source 15 while maintaining the one-to-one relative arrangement of the light source 21 and the collimating element 25 and the one-to-one relative arrangement of the light source 22 and the collimating element 26 in a plane including the Y direction and the Z direction as described above.

[0033] The light beam reduction optical system 130 is disposed on the optical path of the blue light BL emitted from the first light source 11 and on the optical path of the red light RL emitted from the second light source 12, and is disposed on the +X side of the first light source 11 in the X direction, and is disposed at a position overlapping with the first light source 11 and the second light source 12 in the Y and Z directions. The light beam reduction optical system 130 reduces the distance in a plane including the Y and Z directions between the chief ray of the blue light BL emitted from the first light source 11 and the chief ray of the red light RL emitted from the second light source 12, and brings the chief ray of the blue light BL and the chief ray of the red light RL closer to each other.

[0034] The light beam reduction optical system 130 has a condensing element 36 and a collimating element 37. The condensing element 36 emits the light beams of the blue light BL emitted from the collimating elements 25 of the first light source 11 and incident from different positions on the -X side and in a plane including the Y direction and the Z direction toward predetermined positions that are approximately the same or close to each other on the +X side and in a plane including the Y direction and the Z direction. The condensing element 36 focuses the light beams of the blue light BL emitted from the first light source 11 as one light beam of blue light BL, and focuses the light beams of the red light RL emitted from the second light source 12 as one light beam of red light RL. In the plane including the Y direction and the Z direction, the distance between the main rays of the blue light BL emitted from the condensing element 36 decreases as it moves toward the +X side, and the distance between the main rays of the red light RL emitted from the condensing element 36 decreases as it moves toward the +X side. Moreover, the distance between the chief rays of the plurality of blue light beams BL and the chief rays of the plurality of red light beams RL emitted from the light collecting element 36 decreases as they move toward the +X side.

[0035] The light collecting element 36 is, for example, a plano-convex lens with a convex curved surface facing the emission side of the blue light BL and the red light RL. Note that the light collecting element 36 may be a biconvex lens or other optical lens capable of reducing the distance between the principal rays of the plurality of incident blue light beams BL in a plane including the Y direction and the Z direction, the distance between the principal rays of the plurality of red light beams RL in a plane including the Y direction and the Z direction, and the distance between the principal rays of the blue light BL and the principal rays of the red light RL in a plane including the Y direction and the Z direction, as described above.

[0036] The collimating element 37 is disposed on the optical path of the blue light BL and the red light RL emitted from the condensing element 36 and in a state in which the area occupied by the optical path in a plane including the Y direction and the Z direction is reduced. The collimating element 37 is disposed on the +X side of the condensing element 36 in the X direction, and disposed at a position overlapping with the condensing element 36 in the Y direction and the Z direction. The collimating element 37 collimates the incident blue light BL and the red light RL with an appropriate beam width, and emits the collimated blue light BL and the red light RL to the +X side along the X direction. The collimating element 37 is, for example, a plano-concave lens with a concave surface facing the incident side of the blue light BL and the red light. The concave surface of the collimating element 37 is disposed at a position where the separation distance in the Y direction and the Z direction between the blue light BL obtained by converging the beams of a plurality of blue light BL and the red light RL obtained by converging the beams of a plurality of red light BL is reduced to a predetermined distance in the X direction. In addition, the parallelizing element 37 may be an optical lens other than a plano-concave lens that can parallelize the incident blue light BL and red light RL as described above and approximately coincide with the optical path of the blue light BL and the optical path of the red light RL.

[0037] The homogenizing element 40 is disposed on the optical path of the blue light BL and red light RL emitted from the light beam reduction optical system 130. The homogenizing element 40 corresponds to a homogenizing optical system, and homogenizes the intensity distribution in the Y direction and Z direction of the incident blue light BL and red light RL.

[0038] The homogenizing element 40 is configured by, for example, a double-sided lens array 41. The double-sided lens array 41 has a substrate having a plate surface parallel to the Y direction and the Z direction, a plurality of microlenses 42, and the same number of microlenses 43 as the plurality of microlenses 42. The plurality of microlenses 42, 43 split the blue light BL and the red light RL emitted from the collimating element 37 of the light beam reduction optical system 130 along the X direction into a plurality of small light beams in the Y direction and the Z direction. In FIG. 2, the plurality of microlenses 42, 43 are illustrated enlarged, but the diameter of each of the microlenses 42, 43 is sufficiently smaller than the light beam width of the blue light BL and the red light RL.

[0039] The multiple microlenses 42 are provided on the plate surface on the -X side of the substrate of the double-sided lens array 41. The multiple microlenses 42 are adjacent to each other along the Y direction and the Z direction, and are arranged in a matrix in a plane including the Y direction and the Z direction. The microlenses 42 are plano-convex lenses that face a convex surface toward the incident side of the blue light BL and the red light RL. The multiple microlenses 43 are provided on the plate surface on the +X side of the substrate of the double-sided lens array 41. The multiple microlenses 43 are adjacent to each other along the Y direction and the Z direction, and are arranged in a matrix in a plane including the Y direction and the Z direction. One microlens 43 of the multiple microlenses 43 is arranged to correspond to one microlens 42 of the multiple microlenses 42 in the Y direction and the Z direction, and overlaps with the one microlens 42. The microlens 43 is a plano-convex lens that faces a convex surface toward the exit side of the blue light BL and the red light RL.

[0040] The light guiding optical system 45 guides at least the blue light BL and red light RL emitted from the light flux reduction optical system 130 to a light conversion layer 61 of a wavelength conversion device 50A described later. The light guiding optical system 45 further reflects the blue light BL and red light RL emitted from the wavelength selective reflection layers 63, 64 of the wavelength conversion device 50A to the -X side and incident on the light guiding optical system 45 from the +X side, and emits them to the +Y side along the Y direction. The light guiding optical system 45 reflects the green light GL1 emitted from the light conversion layer 61 of the wavelength conversion device 50A to the -X side, diverging from the X direction, and incident on the +X side, and emits it to the +Y side along the Y direction.

[0041] The light guide optical system 45 includes, for example, a dichroic mirror 71 having a flat reflecting surface and a total reflection mirror 72 having a flat reflecting surface. The dichroic mirror 71 is disposed so that at least a part of the reflecting surface overlaps with the optical paths of the blue light BL and the red light RL emitted from the light beam reduction optical system 130 and the optical paths of the green light GL1 and GL2 emitted from the light conversion layers 61 and 66 of the wavelength conversion device 50A described later. The dichroic mirror 71 corresponds to a first optical system. The dichroic mirror 71 transmits the blue light BL and the red light RL incident from the -X side and the +X side along the X direction, and emits them to the +X side and the -X side. The dichroic mirror 71 reflects the green light GL1 and GL2 incident from the +X side along the X direction after being emitted from the light conversion layers 61 and 66 of the wavelength conversion device 50A, and emits them to the +Y side along the Y direction. The reflective surface of the dichroic mirror 71 reflects the green light GL1 and GL2 and transmits the blue light BL and red light RL. The reflective surface of the dichroic mirror 71 is inclined with respect to the X and Y directions when viewed along the Z direction, and is disposed so as to move from the +Y side to the -Y side as it moves from the -X side to the +X side.

[0042] The total reflection mirror 72 is disposed at a position shifted from at least the optical paths of the blue light BL and red light RL emitted from the light beam reduction optical system 130, for example, on the +X side and -Y side of the light beam reduction optical system 130. Meanwhile, the total reflection mirror 72 is disposed so that at least a part of the reflective surface overlaps with the optical paths of the blue light BL and red light RL that are transmitted through the dichroic mirror 71 and emitted from the dichroic mirror 71 to the -X side along the X direction. The total reflection mirror 72 is disposed on the -X side opposite the wavelength conversion device 50A that is disposed on the +X side of the dichroic mirror 71. XThe total reflection mirror 72 corresponds to a second optical system. The total reflection mirror 72 reflects the blue light BL and the red light RL that are incident from the +X side along the X direction after passing through the dichroic mirror 71, and emits them to the +Y side along the Y direction, superimposing the blue light BL and the red light RL on the green light GL1 reflected by the dichroic mirror 71. The reflection surface of the total reflection mirror 72 reflects the blue light BL and the red light RL. The reflection surface of the total reflection mirror 72 is inclined with respect to the X direction and the Y direction when viewed along the Z direction, and is arranged so as to move from the +Y side to the -Y side as it moves from the -X side to the +X side. The reflection surface of the total reflection mirror 72 is arranged parallel to the reflection surface of the dichroic mirror 71, and is smaller than the reflection surface of the dichroic mirror 71 in the Y direction.

[0043] The lens 81 is disposed so as to overlap the optical paths of the blue light BL and red light RL emitted from the dichroic mirror 71 of the light guiding optical system 45 and the optical paths of the blue light BL, red light RL, and green light GL1 emitted from the wavelength conversion device 50A. The lens 81 corresponds to a light collecting optical system. The lens 81 deflects the blue light BL and red light RL emitted from the dichroic mirror 71 of the light guiding optical system 45 after passing through the dichroic mirror 71, and collects the light into the wavelength conversion device 50A to make it incident from the -X side. The lens 81 collimates the green light GL1 and GL2 emitted from the light conversion layers 61 and 66, and makes it incident on the dichroic mirror 71 from the +X side along the X direction.

[0044] Specifically, the lens 81 emits the blue light BL and red light RL incident from the -X side along the X direction through the dichroic mirror 71 of the light guiding optical system 45 to the +X side and -Y side, and converges them toward the light conversion layer 61. At this time, the blue light BL and red light RL are incident on a portion of the lens 81 on the +Y side of the central axis in the Y direction. The lens 81 collimates the blue light BL and red light RL incident from the +X side and +Y side after being reflected by the wavelength selective reflection layers 63, 64 of the wavelength conversion device 50A as described later, and emits them to the -X side along the X direction. At this time, the blue light BL and red light RL are incident on a portion of the lens 81 on the -Y side of the central axis in the Y direction, i.e., center The blue light BL and the red light RL are incident on opposite positions across the axis. The optical paths from the -X side to the +X side of the blue light BL and the red light RL emitted from the light-guiding optical system 45, passing through the lens 81, and reaching the wavelength conversion device 50A are different from the optical paths from the +X side to the -X side of the blue light BL and the red light RL emitted from the wavelength conversion device 50A, passing through the lens 81, and reaching the light-guiding optical system 45.

[0045] Furthermore, the lens 81 is disposed in the X direction on the optical paths of the blue light BL, the red light RL, and the green light GL1, GL2 between the light guiding optical system 45 and the wavelength conversion device 50A. The lens 81 collimates the green light GL1, GL2 incident from the +X side in a state of being diverged about the X direction, emits the green light GL1, GL2 to the -X side along the X direction, and makes it incident on the dichroic mirror 71 of the light guiding optical system 45 from the +X side. The lens 81 is, for example, a biconvex lens, but may be an optical element other than a biconvex lens that is capable of deflecting and collecting the incident blue light BL and red light RL as described above and of collimating the incident green light GL1, GL2 as described above.

[0046] The wavelength conversion device 50A is disposed on the +X side of the lens 81, and is disposed at a position including the light guide optical system 45 and the lens 81 in the Y direction and the Z direction, and extends to the +Y side, +Z side, and -Z side of the light guide optical system 45 and the lens 81. The wavelength conversion device 50A has, for example, a driving device 52, a substrate 54, a diffusion layer 60, light conversion layers 61 and 66, and wavelength selective reflection layers 63 and 64. The wavelength conversion device 50A corresponds to a light conversion element. The wavelength conversion device 50A converts at least the incident blue light BL into yellow light YL of a yellow wavelength band different from the blue wavelength band. The yellow light YL corresponds to the third light. The yellow wavelength band corresponds to the third wavelength band and includes a first green wavelength band and a red wavelength band of the green wavelength band. The green wavelength band includes at least a wavelength belonging to green in the visible wavelength band, and is, for example, a wavelength band of 500 nm to 600 nm. The yellow light YL includes green light GL1 in a first green wavelength band and red light RF. The first green wavelength band is included in the green wavelength band, and is, for example, a wavelength band of 550 nm to 600 nm. The red wavelength band of the red light RF included in the yellow light YL includes wavelengths that belong to at least the red color in the visible wavelength band, and may be the same as the red wavelength band emitted from the second light source 12, or may be shifted from the red wavelength band emitted from the second light source 12 within a range that belongs to the red color.

[0047] The substrate 54 has a plate surface parallel to the Y direction and the Z direction. The driving device 52 rotates the substrate 54 around the rotation axis JX. The driving device 52 is, for example, a motor, and has a shaft member (not shown) with the rotation axis JX as its axis. The shaft member of the driving device 52 is, for example, connected from the plate surface 54b on the +X side of the substrate 54 to the center in the radial direction centered on the rotation axis JX of the substrate 54. When viewed along the X direction, the rotation axis JX coincides with the center of the plate surface of the substrate 54, and is located on the +Y side of the optical axes of the blue light BL and the red light RL emitted from the dichroic mirror 71 and the lens 81 of the light-guiding optical system 45. The substrate 54 is, for example, a metal disk. The material of the substrate 54 may be a resin having strength other than metal, and is not limited to a specific material.

[0048] FIG. 4 is a schematic diagram of the wavelength converter 50A, and is a diagram of the wavelength converter 50A when viewed from the -X side along the X direction and the rotation axis JX. FIG. 5 is a cross-sectional view of the wavelength converter 50A, and is a view when viewed along the VV line shown in FIG. 4. FIG. 6 is a cross-sectional view of the wavelength converter 50A, and is a view when viewed along the VI-VI line shown in FIG. 4. Note that the driving device 52 is omitted in FIGS. 4 to 6. As shown in FIGS. 4 to 6, the plate surface 54a on the -X side of the substrate 54, on which the blue light BL and the red light RL emitted from the light guiding optical system 45 and the lens 81 are incident, is divided into a central portion, an inner peripheral portion outside the central portion, and an outer peripheral end portion spaced apart from the inner peripheral portion in the radial direction centered on the rotation axis JX. Furthermore, the inner peripheral portion of the plate surface 54a of the substrate 54 is divided into a plurality of regions in the circumferential direction centered on the rotation axis JX, for example, into four regions in an angular range of 90°.

[0049] A reflective layer 55 is laminated on the entire surface 54a of the substrate 54. The reflective layer 55 reflects the incident blue light BL, green light GL1, GL2, and red light RF. Note that the reflective layer 55 is omitted in schematic diagrams showing the overall configuration of the optical device such as FIG. 2.

[0050] The light conversion layer 61 is provided on the -X side surface of the reflective layer 55 which is laminated in one or more regions of a plurality of regions on the inner periphery of the plate surface 54a of the substrate 54, and is laminated on the reflective layer 55 in the X direction. The light conversion layer 61 is disposed in, for example, one of four regions on the inner periphery of the plate surface 54a of the substrate 54. When the substrate 54 rotates in the circumferential direction about the rotation axis JX and the light conversion layer 61 reaches the -Y side, the centers of the light conversion layer 61 in the Y and Z directions substantially overlap with the optical axes of the blue light BL and the red light RL emitted from the dichroic mirror 71 and the lens 81 of the light guiding optical system 45.

[0051] The light conversion layer 61 converts the incident blue light BL into yellow light YL. The light conversion layer 61 corresponds to a first light conversion layer, and is excited by the blue light BL incident from the -X side to emit yellow light YL as fluorescence. The yellow light YL is emitted from the light conversion layer 61 to both the -X side and the +X side radially over a wide range centered on the X direction. The light conversion layer 61 is formed of, for example, a fluorescent material containing cerium (Ce) that can be excited by the blue light BL to emit yellow light.

[0052] The wavelength selective reflecting layer 64 is provided on the -X side surface of the light conversion layer 61 via an adhesive layer 65. The -X side surface of the light conversion layer 61 corresponds to the light incident surface. The adhesive layer 65 transmits light in the visible wavelength band. Note that the wavelength selective reflecting layer 64 may be laminated on the -X side surface of the light conversion layer 61, and the adhesive layer 65 may be omitted.

[0053] FIG. 7 is a graph showing an example of the relative light intensity distribution of the yellow light YL emitted from the light conversion layer 61 and the red light RL emitted from the second light source 12. The wavelength selective reflection layer 64 reflects the red light RF contained in the incident red light RL and the yellow light YL. The wavelength selective reflection layer 64 corresponds to the first wavelength selective reflection layer. The wavelength selective reflection layer 64 reflects the red light RL emitted from the second light source 12 and incident from the -X side and the +Y side by the lens 81 to the -X side and the -Y side, and disperses it. The wavelength selective reflection layer 64 reflects the red light RF incident from the +X side among the yellow light YL emitted from the light conversion layer 61 to the +X side, and transmits the green light GL1 included in the yellow light YL incident from the +X side and the blue light BL incident from the +X side and the -X side. FIG. 8 is a graph showing an example of the reflectance characteristic of the wavelength selective reflection layer 64. The wavelength-selective reflective layer 64 is designed based on the light intensity distribution of the yellow light YL and the red light RL illustrated in FIG. 7, and is composed of a dielectric multilayer film that can wavelength-selectively specularly reflect the red light RF, RL in the red wavelength band within the visible wavelength band, as shown in FIG. 8.

[0054] The wavelength-selective reflective layer 64 may reflect the red light RF in a wavelength band different from the red light RL, and may be capable of wavelength-selectively regular reflecting only the red light RL. In addition, since the red light RF contained in the yellow light YL, which is fluorescence, contains few components on the higher wavelength side than, for example, 650 nm, the selective reflective layer 64 may be capable of transmitting light in a wavelength band of 650 nm or more.

[0055] The wavelength-selective reflection layer 63 is provided on the surface of the -X side of the reflection layer 55 in one of the multiple regions on the inner periphery of the plate surface 54a of the substrate 54, more specifically, in the multiple regions where the light conversion layer 61 is laminated and in every other region in the circumferential direction centered on the rotation axis JX, and is laminated on the reflection layer 55 in the X direction. The wavelength-selective reflection layer 63 reflects the incident blue light BL. The wavelength-selective reflection layer 63 corresponds to a reflection section. The wavelength-selective reflection layer 63 reflects the blue light BL emitted from the first light source 11 and incident from the -X side and +Y side to the -X side and -Y side, and dissipates it. The wavelength-selective reflection layer 63 is composed of, for example, a dielectric multilayer film capable of wavelength-selective regular reflection of the blue light BL of light in the visible wavelength band.

[0056] The light conversion layer 66 is provided on the surface of the -X side of the reflection layer 55, which is laminated in a region between the region where the light conversion layer 61 is arranged and the region where the wavelength selective reflection layer 63 is arranged in the circumferential direction centered on the rotation axis JX among a plurality of regions of the inner periphery of the plate surface 54a of the substrate 54, and is laminated on the reflection layer 55 in the X direction. The light conversion layer 66 converts the incident blue light BL into green light GL2 in a second green wavelength band of the green wavelength band. The light conversion layer 66 corresponds to the second light conversion layer. The green light GL2 corresponds to the fourth light. The second green wavelength band is included in the green wavelength band and corresponds to the fourth wavelength band. The second green wavelength band may be the same as the first green wavelength band of the green light GL1 emitted from the light conversion layer 61, or may be shifted from the first green wavelength band within a range belonging to green, for example, a wavelength band of 560 nm to 600 nm.

[0057] The light conversion layer 66 is excited by blue light BL incident from the -X side, and emits green light GL2 as fluorescence. The green light GL2 is emitted from the light conversion layer 66 to both the -X side and the +X side, radially over a wide range centered on the X direction. The light conversion layer 66 is formed of, for example, a fluorescent material containing cerium (Ce) that can be excited by blue light BL to emit green light GL2.

[0058] The diffusion layer 60 is provided on the -X side surface of the entire reflective layer 55 in the circumferential direction centered on the rotation axis JX of the outer circumferential end of the plate surface 54a of the substrate 54, via an adhesive layer 65. The diffusion layer 60 extends outward beyond the outer circumferential end of the plate surface 54a of the substrate 54 in the radial direction centered on the rotation axis JX, and protrudes outward beyond the outer circumferential edges of the substrate 54 and the reflective layer 55 when viewed in the X direction and along the rotation axis JX.

[0059] The diffusion layer 60 transmits the blue light BL, red light RL, and green light GL1, GL2 emitted from the total reflection mirror 73 described later to the +X side along the X direction and incident from the -X side through the superimposing lens 82, and diffuses them in a plane including the Y direction and the Z direction. In the following description, the green light GL1, GL2 may be collectively referred to as green light GL. The blue light BL, red light RL, and green light GL are diffused by the diffusion layer 60, thereby reducing speckles in the image enlarged and projected from the projection optical system 600 onto the display surface of the screen SCR. The diffusion layer 60 is composed of, for example, a light diffusion element or a light diffusion material having a fine structure, such as a concave-convex structure, appropriately small for each wavelength band of the blue light BL, red light RL, and green light GL, formed on the surface on the -X side.

[0060] As shown in FIG. 2, the reflection optical system 173 reflects the light from the light guide optical system 45 to the light guide optical system 45. To the +Y sideThe reflection optical system 173 is provided on the optical paths of the emitted blue light BL, red light RL, and green light GL1, GL2, and is arranged at a position overlapping with the light guiding optical system 45 in the X and Z directions, is arranged on the +Y side of the light guiding optical system 45, and is arranged at a position overlapping with the diffusion layer 60 of the wavelength conversion device 50A in the Y direction. The reflection optical system 173 reflects the green light GL1, GL2 emitted from the dichroic mirror 71 of the light guiding optical system 45, and the blue light BL and red light RL emitted from the total reflection mirror 72, along the X direction, toward the +X side, i.e., the wavelength conversion device 50A side. The reflection optical system 173 corresponds to a third optical system.

[0061] The reflection optical system 173 has, for example, a dichroic mirror 74 having a flat reflection surface, and a total reflection mirror 75 having a flat reflection surface. An optical axis parallel to the X direction passing through the center in the Y direction and the Z direction of the region on the reflection surface of the dichroic mirror 74 where the blue light BL, the red light RL, and the green lights GL1 and GL2 are incident, and an optical axis parallel to the X direction passing through the center in the Y direction and the Z direction of the region on the reflection surface of the total reflection mirror 75 where the red light RL is incident, pass through approximately the center in the Y direction of the diffusion layer 60 on the +Y side of the wavelength conversion device 50, which extends to the +Y side, i.e., radially outward, from the substrate 54.

[0062] The dichroic mirror 74 is disposed so that at least a part of the reflecting surface overlaps with the optical paths of the blue light BL, the red light RL, and the green light GL1 and GL2 emitted from the light guide optical system 45. The dichroic mirror 74 corresponds to a fourth optical system. The dichroic mirror 74 reflects the blue light BL incident from the -Y side along the Y direction, emits it to the +X side along the X direction, transmits the red light RL incident from the -Y side along the Y direction, and emits it to the +Y side. The dichroic mirror 74 reflects the green light GL1 and GL2 incident from the -Y side along the Y direction, emits it to the +X side along the X direction, and superimposes it on the blue light BL. That is, the reflecting surface of the dichroic mirror 74 reflects the blue light BL and the green light GL1 and GL2, and transmits the red light RL. The reflecting surface of dichroic mirror 74 is inclined with respect to the X and Y directions when viewed along the Z direction, and is disposed so as to move from the -Y side to the +Y side as it moves from the -X side to the +X side.

[0063] The total reflection mirror 75 is disposed at least on the optical path of the red light RL emitted from the light guiding optical system 45, and is disposed on the optical path of the red light RL transmitted through the dichroic mirror 74. The total reflection mirror 75 is disposed so that at least a part of the reflection surface overlaps with the optical path of the red light RL transmitted through the dichroic mirror 74 and emitted from the dichroic mirror 74 to the +Y side along the Y direction. The total reflection mirror 75 corresponds to a fifth optical system. The total reflection mirror 75 reflects the red light RL guided by the light guiding optical system 45, transmitted through the dichroic mirror 74, and incident from the -Y side, emits it to the +X side along the X direction, and superimposes the red light RL on the blue light BL and green light GL1, GL2 reflected by the dichroic mirror 74. The reflection surface of the total reflection mirror 75 reflects at least the red light RL, but may also reflect light in the visible wavelength range, for example. The reflective surface of total reflection mirror 75 is inclined with respect to the X and Y directions when viewed along the Z direction, and is disposed so as to move from the -Y side to the +Y side as it moves from the -X side to the +X side. The reflective surface of total reflection mirror 75 is disposed parallel to the reflective surface of dichroic mirror 74, and is smaller than the reflective surface of dichroic mirror 74 in the Y direction.

[0064] The superimposing lens 82 is disposed between the reflection optical system 173 and the diffusion layer 60 on the +Y side of the wavelength conversion device 50A in the X direction, and disposed at a position overlapping with the reflection optical system 173 in the Y and Z directions. The central axis of the superimposing lens 82 in the Y direction substantially overlaps with the optical axes of the blue light BL and the green light GL1, GL2 emitted from the dichroic mirror 74 of the reflection optical system 173 to the +X side, and substantially overlaps with the optical axis of the red light RL emitted from the total reflection mirror 75 to the +X side.

[0065] The superimposing lens 82 collects the blue light BL and the red light RL emitted from the double-sided lens array 41, passing through the dichroic mirror 71, the lens 81, and the wavelength conversion device 50A of the light guide optical system 45, and emitted from the total reflection mirror 73, and the green light GL1 and GL2 generated due to the multiple small beams of the blue light BL and the red light RL, and emits them to the +X side along the X direction. The superimposing lens 82 cooperates with the multiple microlenses 42 and 43 of the double-sided lens array 41 to superimpose the blue light BL, the red light RL, and the green light GL1 and GL2 on each other in the image formation areas of the above-mentioned optical modulation devices 400R, 400G, and 400B, or in the vicinity of the image formation areas on the optical paths of the colored lights. The superimposing lens 82 is, for example, a biconvex lens, but may be an optical element having a light collecting function other than a biconvex lens, may be a plano-convex lens, or may be composed of multiple optical lenses.

[0066] The rod lens 85 is disposed on the +X side of the diffusion layer 60 on the +Y side of the wavelength converter 50A in the X direction, and is disposed at a position overlapping with the reflection optical system 173, the superimposing lens 82, and the diffusion layer 60 on the +Y side of the wavelength converter 50A in the Y and Z directions. The axis of the rod lens 85 is parallel to the X direction, and substantially overlaps with the optical axes of the blue light BL, red light RL, and green light GL1, GL2 emitted to the +X side from the reflection optical system 173, the superimposing lens 82, and the diffusion layer 60 on the +Y side of the wavelength converter 50A, respectively.

[0067] The rod lens 85 propagates the blue light BL, red light RL, and green light GL1, GL2 that are emitted from the diffusion layer 60 on the +Y side of the wavelength conversion device 50A in a state in which they are diverged to the +X side with the X direction as the center and diffused within a plane including the Y and Z directions and enter from the -X side along the axis to the +X side, and homogenizes the light intensity distribution of the blue light BL, red light RL, and green light GL1, GL2 within the plane including the Y and Z directions. The rod lens 85 emits the homogenized blue light BL, red light RL, and green light GL1, GL2 from the end face on the +X side to the +X side along the X direction.

[0068] In the light source device 110 having the above-mentioned configuration, the multiple light sources 21 of the first light source 11, the multiple light sources 22 of the second light source 12, and the drive device 52 of the wavelength conversion device 50A are connected to a control device (not shown). The control device supplies an electric signal of a predetermined voltage to the multiple light sources 21 of the first light source 11, and supplies an electric signal of a predetermined voltage for a predetermined lighting time to the multiple light sources 22 of the second light source 12. That is, the control device performs pulse control of the multiple second light sources 12.

[0069] The control device drives the drive device 52 of the wavelength conversion device 50A while supplying electrical signals to the multiple light sources 21 and 22, rotates the substrate 54 around the rotation axis JX, and drives the optical modulation devices 400R, 400G, and 400B. The control device synchronizes the emission of blue light BL from the multiple light sources 21, the emission of red light RL from the multiple light sources 22, and the rotation of the substrate 54, and during the period when the multiple light sources 21 are supplied with power signals to emit the blue light BL from the multiple light sources 21, the blue light BL emitted from the lens 81 and incident on the wavelength conversion device 50A is incident on one of the light conversion layers 61 and 66, and during the lighting period when the multiple light sources 22 are supplied with power signals to emit the red light RL from the multiple light sources 22, the red light RL emitted from the lens 81 and incident on the wavelength conversion device 50A is incident on the wavelength selection reflection layer 64. That is, the control device matches the timing at which the red light RL starts to be emitted from the multiple light sources 22 with the timing at which the red light RL entering the wavelength converter 50A from the lens 81 enters one end in the circumferential direction about the rotation axis JX of the wavelength selective reflecting layer 64. The control device matches the timing at which the emission of the red light RL from the multiple light sources 22 stops with the timing at which the red light RL entering the wavelength converter 50A from the lens 81 enters the other end in the circumferential direction of the wavelength selective reflecting layer 64.

[0070] The blue light BL emitted from the multiple light sources 21 of the first light source 11 is collimated by the collimating element 25, and the width of the entire light beams of the multiple blue light BL is reduced by the light beam reduction optical system 130, and the blue light BL is combined into one light beam. The blue light BL emitted from the light beam reduction optical system 130 to the +X side along the X direction passes through the homogenizing element 40, transmits through the dichroic mirror 71 of the light guiding optical system 45, is further guided to the +X side along the X direction, enters a portion on the +Y side of the central axis of the lens 81, and is collected by the lens 81 into the wavelength conversion device 50A.

[0071] The blue light BL focused by the lens 81 is incident sequentially on the wavelength selective reflecting layer 64, the light conversion layer 66, the wavelength selective reflecting layer 63, and the light conversion layer 66 from the -X side and the +Y side in chronological order, as the substrate 54 of the wavelength conversion device 50A is rotated circumferentially around the rotation axis JX by the driving device 52.

[0072] The blue light BL incident on the wavelength selective reflection layer 64 passes through the wavelength selective reflection layer 64 and the adhesive layer 65, and enters the light conversion layer 61. A part of the blue light BL incident on the light conversion layer 61 from the -X side excites the light conversion layer 61, causing the light conversion layer 61 to emit yellow light to the -X side and +X side. The yellow light has a Lambertian distribution centered on the X direction. At least a part of the remaining blue light BL incident on the light conversion layer 61 from the -X side passes through the light conversion layer 61. The yellow light and blue light BL emitted from the light conversion layer 61 to the +X side are reflected by the reflection layer 55 to the -X side. A part of the blue light BL reflected by the reflection layer 55 re-excites the light conversion layer 61 and is converted to yellow light. The yellow light reflected by the reflection layer 55 is emitted to the -X side, passes through the light conversion layer 61 and the adhesive layer 65 in sequence, and enters the wavelength selective reflection layer 64 from the +X side. The green light GL1 contained in the yellow light YL that is emitted from the light conversion layer 61 and enters the wavelength selective reflecting layer 64 from the +X side passes through the wavelength selective reflecting layer 64 and is emitted to the -X side of the wavelength selective reflecting layer 64. The red light RF contained in the yellow light YL that enters the wavelength selective reflecting layer 64 from the +X side is reflected by the wavelength selective reflecting layer 64 and is not emitted from the wavelength converter 50A.

[0073] A part of the blue light BL incident on the light conversion layer 66 excites the light conversion layer 66, causing the light conversion layer 66 to emit green light GL2 to the -X side and +X side. The green light GL2 also has a Lambertian distribution centered approximately on the X direction, similar to the yellow light YL. At least a part of the remaining blue light BL incident on the light conversion layer 66 from the -X side passes through the light conversion layer 66 and is reflected by the reflecting layer 55 to the -X side. At least a part of the blue light BL reflected by the reflecting layer 55 re-excites the light conversion layer 66 and is converted into green light GL2. The green light GL2 reflected by the reflecting layer 55 passes through the light conversion layer 66 and is emitted to the -X side.

[0074] As a result, during the time period when the blue light BL is incident on the wavelength selective reflection layer 64 and the light conversion layer 61, only the green light GL1 is emitted from the wavelength selective reflection layer 64 to the -X side with a divergence angle larger than that of the blue light BL and diverges, approximately centered on the X direction. During the time period when the blue light BL is incident on the light conversion layer 66, only the green light GL2 is emitted from the light conversion layer 66 to the -X side with a divergence angle larger than that of the blue light BL and diverges, approximately centered on the X direction.

[0075] The blue light BL incident on the wavelength selective reflecting layer 63 is reflected, emitted from the wavelength selective reflecting layer 63 to the -X side and the -Y side, and diverges. That is, during the time period when the blue light BL is incident on the wavelength selective reflecting layer 63, only the blue light BL is emitted from the wavelength selective reflecting layer 63 to the -X side and the -Y side.

[0076] According to the above-described operating principle, while blue light BL is being emitted from the multiple light sources 21 of the first light source 11, the wavelength conversion device 50A constantly emits the blue light BL while diverging it toward the -X side and the -Y side, and emits the green light GL during a predetermined time period while diverging it toward the -X side at a divergence angle larger than that of the blue light BL, with the X direction as the approximate center.

[0077] The blue light BL emitted from the wavelength conversion device 50A is incident on the -Y side of the central axis of the lens 81, is emitted parallel to the -X side along the X direction, passes through the dichroic mirror 71 of the light guide optical system 45, is reflected by the total reflection mirror 72, and is emitted from the total reflection mirror 72 to the +Y side along the Y direction. The green light GL1, GL2 emitted from the wavelength conversion device 50A is incident on the -Y side and +Y side with respect to the central axis of the lens 81, is emitted parallel to the -X side along the X direction, and has a larger light flux width in the Y direction and Z direction than the blue light BL. The green light GL1, GL2 emitted from the lens 81 to the -X side is reflected by the dichroic mirror 71, and is emitted from the dichroic mirror 71 to the +Y side along the Y direction. The light guide optical system 45 causes the optical path of the green light GL emitted to the +Y side along the Y direction to overlap with the optical path of the blue light BL. The phrase "overlap on the optical path" refers to a state in which at least parts of the light beams forming the respective color lights are on the same optical path.

[0078] The blue light BL and the green light GL1, GL2 emitted from the light guide optical system 45 to the +Y side along the Y direction are reflected by the dichroic mirror 74 of the reflection optical system 173, emitted from the dichroic mirror 74 to the +X side along the X direction, collected by the superimposing lens 82, diffused by the diffusion layer 60 arranged in the wavelength conversion device 50A and diverged again, passed through the rod lens 85, and entered the color separation optical system 200 of FIG. 1. The control device drives the light modulation device 400B during the time period when at least the blue light BL is incident from the light source device 110, and converts the blue light BL into blue image light as described above. The control device drives the light modulation device 400G during the time period when at least the green light GL1, GL2 is incident from the light source device 110 as the green light GL, and converts the green light GL into green image light as described above.

[0079] Moreover, the red light RL emitted from the multiple light sources 22 of the second light source 12 is collimated by the collimating element 26, and the width of the entire light beams of the multiple blue light BL is reduced by the light beam reduction optical system 130, and the light beams are combined into one light beam. The light beam reduction optical system 130 merges the optical path of the red light RL with the optical path of the blue light BL, and the red light RL is emitted from the light beam reduction optical system 130 to the +X side along the X direction, and passes through the homogenizing element 40. The optical path and behavior of the red light RL from being emitted from the homogenizing element 40 to being incident on the wavelength conversion device 50A are similar to the optical path and behavior of the blue light BL within the same range.

[0080] The red light RL collected by the lens 81 is incident on the wavelength selective reflecting layer 64 from the -X side and the +Y side as a result of the substrate 54 of the wavelength conversion device 50A being rotated in the circumferential direction about the rotation axis JX by the driving device 52 and the rotation of the substrate 54 being synchronized with the lighting of the red light RL from the second light source 12. The red light RL incident on the wavelength selective reflecting layer 64 is reflected, and emitted from the wavelength selective reflecting layer 64 to the -X side and the -Y side, where it diverges.

[0081] For example, when the rotation speed of the substrate 54 around the rotation axis JX by the driving device 52 is T0 [seconds / rotation], and the plate surface 54a of the substrate 54 is equally divided into four regions in the circumferential direction as described above, the time period of each of the green lights GL1 and GL2 emitted from the wavelength conversion device 50A at one time, i.e., the predetermined emission time of each of the green lights GL1 and GL2, is T0 × (1 / 4) [seconds], and the time during which neither of the green lights GL1 and GL2 is emitted is T0 × (1 / 4) [seconds]. In the same case, the time period of the red light RL emitted from the wavelength conversion device 50A at one time, i.e., the predetermined emission time of the red light RL, is T0 × (1 / 4) [seconds], and the time during which the red light RL is not emitted is T0 × (3 / 4) [seconds]. The timing and time period during which the red light RL is emitted coincide with the timing and time period during which the green light GL1 is emitted, but are different from the timing and time period during which the green light GL2 is emitted. When the substrate 54 rotates once, for example, red light RL and green light GL1 are emitted from the wavelength conversion device 50A for T0×(1 / 4) [seconds], then green light GL2 is emitted for T0×(1 / 4) [seconds], then blue light BL is emitted for T0×(1 / 4) [seconds], and green light GL2 is emitted again for T0×(1 / 4) [seconds]. In the control device, the above-mentioned lighting times and conditions of the electrical signals supplied to the multiple light sources 21 of the first light source 11 and the multiple light sources 22 of the second light source 12 are adjusted and appropriately set according to the light amounts required for the blue light BL, green light GL, and red light RL emitted from the light source device 110 and the light amount ratios in the colored lights.

[0082] The red light RL emitted from the wavelength conversion device 50A enters a portion of the lens 81 on the -Y side of the central axis, is emitted parallel to the X direction to the -X side, transmits through the dichroic mirror 71 of the light guiding optical system 45, is reflected by the total reflection mirror 72, and is emitted from the total reflection mirror 72 to the +Y side along the Y direction. The optical path of the red light RL emitted to the +Y side along the Y direction by the light guiding optical system 45 approximately overlaps with the optical path of the blue light BL.

[0083] The red light RL emitted from the light-guiding optical system 45 to the +Y side along the Y direction passes through the dichroic mirror 74 of the reflection optical system 173, is reflected by the total reflection mirror 75, and is emitted from the total reflection mirror 75 to the +X side along the X direction. The red light RL is collected by the superimposing lens 82, diffused by the diffusion layer 60 arranged in the wavelength conversion device 50A and diverges again, passes through the rod lens 85, and enters the color separation optical system 200 of Figure 1. The control device includes: The light modulation device 400R is driven during a time period when at least red light RL is incident from the light source device 110, and converts the red light RL into red image light as described above.

[0084] The light source device 110 of the first embodiment described above includes at least the first light source 11, the second light source 12, a wavelength conversion device (light conversion element) 50A, a light beam reduction optical system 130, and a light guide optical system 45. The first light source 11 emits blue light (first light) BL in a blue wavelength band (first wavelength band). The second light source 12 emits red light (second light) RL in a red wavelength band (second wavelength band) different from the blue wavelength band. The wavelength conversion device 50A converts the incident blue light BL into yellow light (third light) YL in a yellow wavelength band (third wavelength band) different from the blue wavelength band. The light beam reduction optical system 130 brings the main ray of the blue light BL emitted from the first light source 11 and the main ray of the red light RL emitted from the second light source 12 closer to each other. The light guiding optical system 45 guides the blue light BL and red light RL emitted from the light flux reduction optical system 130 to the +X side along the X direction to the wavelength conversion device 50A. In the light source device 110 of the first embodiment, the light guiding optical system 45 reflects the blue light BL, red light RL, green light GL1 of the yellow light YL, and green light GL2 emitted from the wavelength conversion device 50A to the -X side, and emits them, for example, to the +Y side different from the +X side facing the wavelength conversion device 50A.

[0085] In the light source device 110 of the first embodiment, the light beam reduction optical system 130 brings the chief ray of the blue light BL and the chief ray of the red light RL emitted along the X direction from different positions in a plane including the Y direction and the Z direction closer to each other, and then causes them to travel in the same direction and enter the wavelength conversion device 50A. In the light source device 110 of the first embodiment, the light guiding optical system 45 aligns the optical paths of the blue light BL and the red light RL along the X direction from the light guiding optical system 45 to the wavelength conversion device 50A. In a plane including the Y and Z directions The first light source 11 and the second light source 12 can be spaced apart from each other, and the first light source 11 and the second light source 12 can be arranged together on the same -X side with respect to the light guide optical system 45. In the light source device 110 of the first embodiment, the optical paths of the blue light BL, the red light RL, and the green light GL1 and GL2 emitted from the wavelength conversion device 50A can be made to coincide with each other. For these reasons, it is possible to achieve a smaller size than the conventional light source device. Therefore, according to the light source device 110 of the first embodiment, the first light source 11 that emits blue light BL as excitation light that can excite the phosphor that the wavelength conversion device 50A has and that performs the wavelength conversion function, and the second light source that emits red light RL as color light different from the blue light BL are provided, and the number of parts can be reduced and the size can be suppressed.

[0086] In the light source device 110 of the first embodiment, the wavelength conversion device 50A has a substrate 54, a light conversion layer (first light conversion layer) 61, and a wavelength selective reflection layer (first wavelength selective reflection layer) 64. The substrate 54 has a reflection layer 55 that reflects at least blue light BL. The light conversion layer 61 is disposed on the reflection layer 55, and converts the incident blue light BL into yellow light YL including green light GL1 in a first green wavelength band and red light RF in a red wavelength band. The wavelength selective reflection layer 64 is disposed on the surface (light incident surface) on the -X side of the light conversion layer 61, and reflects the red lights RL and RF.

[0087] In the light source device 110 of the first embodiment, by specularly reflecting the blue light BL on the reflective layer 55 and specularly reflecting the red light RL on the wavelength selective reflective layer 64, when the blue light BL and the red light RL are incident from a direction inclined with respect to the direction perpendicular to the surface of each reflective layer, they can be emitted in a direction different from the direction at the time of incidence. According to the light source device 110 of the first embodiment, the optical paths of the blue light BL and the red light RL at the time of emission from the wavelength conversion device 50A can be easily shifted from the optical paths at the time of incidence into the wavelength conversion device 50A.

[0088] In the light source device 110 of the first embodiment, the light guide optical system 45 includes a dichroic mirror (first optical system) 71 and a total reflection mirror (second optical system) 72. The dichroic mirror 71 reflects the green light GL emitted from the wavelength conversion device 50A. The total reflection mirror 72 reflects the blue light BL and the red light RL to an optical path where the blue light BL and the red light RL overlap with the green light GL reflected by the dichroic mirror 71.

[0089] In the light source device 110 of the first embodiment, the optical path of the blue light BL and the optical path of the red light RL are overlapped with the optical path of the green light GL by a total reflection mirror 72 arranged separately from the dichroic mirror 71, so that the size is prevented from becoming large and the illuminance distribution of the colored light at a stage downstream of the light-guiding optical system 45 can be easily controlled.

[0090] In the light source device 110 of the first embodiment, the total reflection mirror 72 is disposed on the opposite side of the dichroic mirror 71 to the wavelength conversion device 50A.

[0091] In the light source device 110 of the first embodiment, the total reflection mirror 72 is disposed on the opposite side of the dichroic mirror 71 in the X direction from the wavelength conversion device 50A, for example, on the -X side, so that the total reflection mirror 72 that reflects the green light GL without transmitting it can be used as the second optical system. According to the light source device 110 of the first embodiment, the second optical system can be easily configured.

[0092] The light source device 110 of the first embodiment further includes a lens (light-concentrating optical system) 81 arranged on the optical path of the blue light BL and the red light RL between the light-guiding optical system 45 and the wavelength conversion device 50A. The lens 81 causes the blue light BL and the red light RL that have passed through the light-guiding optical system 45 to be incident on the wavelength conversion device 50A, and causes the colored light emitted from the wavelength conversion device 50A to be incident on the light-guiding optical system 45. In the light source device 110 of the first embodiment, the blue light BL and the red light RL that have passed through the light-guiding optical system 45 are incident on a position separated from the central axis of the lens 81 in the Y direction, i.e., a position separated in the radial direction of the lens 81.

[0093] In the light source device 110 of the first embodiment, when the blue light BL and the red light RL enter from the light guide optical system 45, they enter a portion away from the central axis of the lens 81, i.e., the optical axis of the colored light, in the Y direction, for example, on the +Y side, and when the blue light BL and the red light RL enter from the wavelength conversion device 50A, they enter from the central axis of the lens 81 on the opposite side in the Y direction from the central axis of the lens 81 to the portion at the -Y side from the central axis of the lens 81. According to the light source device 110 of the first embodiment, the optical paths of the blue light BL and the red light RL when entering the lens 81 from the light guide optical system 45 and the optical paths of the blue light BL and the red light RL when entering from the wavelength conversion device 50A are made different from each other, and it is possible to easily prevent the blue light BL and the red light RL emitted from the wavelength conversion device 50A from propagating toward the first light source 11 and the second light source 12.

[0094] In the light source device 110 of the first embodiment, the wavelength conversion device 50A includes a wavelength-selective reflection layer (reflection portion) 63 that reflects blue light BL. The substrate 54 is a circular plate made of metal. The wavelength-selective reflection layer 63 and the light conversion layer 61 are disposed in different regions in the circumferential direction around the rotation axis JX of the circular plate forming the substrate 54.

[0095] In the light source device 110 of the first embodiment, a wavelength selective reflecting layer 63 that reflects blue light BL is disposed in the wavelength selecting device 50A, so that the amount of blue light BL emitted from the wavelength selecting device 50 can be easily adjusted, for example, by adjusting the size of the wavelength selective reflecting layer 63 in the circumferential direction.

[0096] In the light source device 110 of the first embodiment, the wavelength conversion device 50A further includes a light conversion layer (second light conversion layer) 66. The light conversion layer 66 converts the incident blue light BL into green light (fourth light) GL2 in a green wavelength band (fourth wavelength band) that is different from the blue wavelength band and the red wavelength band and is included in the yellow wavelength band corresponding to the third wavelength band. The light conversion layer 66 is disposed on the reflection layer 55, and the light conversion layer 61 and the wavelength selective reflection layer 63 are disposed in different regions from each other in the circumferential direction of the substrate 54.

[0097] In the light source device 110 of the first embodiment, the wavelength conversion device 50A further has a light conversion layer 66 that is excited by blue light BL and emits green light GL, thereby increasing the amount of green light GL emitted from the wavelength conversion device 50A and expanding the color gamut of the colored light emitted from the downstream rod lens 85.

[0098] The light source device 110 of the first embodiment further includes a reflective optical system (third optical system) 173. The reflective optical system 173 reflects color light including blue light BL, red light RL, and green light GL emitted from the light-guiding optical system 45 to the +X side, that is, to the wavelength conversion device 50A side in the X direction.

[0099] In the light source device 110 of the first embodiment, the colored light emitted from the wavelength conversion device 50A to the -X side and reflected to the +Y side by the light-guiding optical system 45 is guided to the +X side toward the wavelength conversion device 50A by the total reflection optical system 173, so that the optical path of the colored light is folded back, and it is possible to suppress an increase in size at least in the X direction.

[0100] In the light source device 110 of the first embodiment, the wavelength conversion device 50A has a diffusion layer 60. The diffusion layer 60 is provided at an outer circumferential end portion, which is a region (position) different from the inner circumferential portion where the light conversion layer 61 is provided, in a radial direction centered on the rotation axis JX of the substrate 54. The diffusion layer 60 transmits and diffuses colored light (light) including blue light BL, red light RL, and green light GL emitted from the reflection optical system 173.

[0101] In the light source device 110 of the first embodiment, the diffusion layer 60 extends radially outward beyond the outer peripheral end of the plate surface 54a of the substrate 54, that is, extends radially outward beyond the substrate 54. According to the light source device 110 of the first embodiment, One Since the wavelength converter 50A has a light conversion function of converting blue light BL into green light GL and a light diffusion function of diffusing the colored light within a plane including the Y direction and Z direction, the number of components can be reduced, and miniaturization can be achieved.

[0102] The light source device 110 of the first embodiment further includes a homogenizing element (homogenizing optical system) 40. The homogenizing element 40 is disposed between the light beam reduction optical system 130 and the light guiding optical system 45 on the optical paths of the blue light BL and the red light RL, and homogenizes the illuminance distribution of the blue light BL and the red light RL.

[0103] In the light source device 110 of the first embodiment, the illuminance distribution in a plane perpendicular to the optical axis of the blue light BL and the red light RL is homogenized by the homogenizing element 40, thereby making it possible to suppress color unevenness in the colored light downstream of the light source device 110 and illuminance unevenness in the image when the colored light is converted into image light.

[0104] The light source device 110 of the first embodiment further includes a rod lens 85. The rod lens 85 homogenizes the light intensity distribution in a plane intersecting the optical axis of the color light (light) transmitted through the diffusion layer 60 of the wavelength conversion device 50A, for example, in a plane including the Y direction and the Z direction.

[0105] In the light source device 110 of the first embodiment, the illuminance distribution of the colored light can be easily made uniform by the rod lens 85 arranged at the rearmost stage on the optical paths of the blue light BL, red light RL, and green light GL.

[0106] In the light source device 110 of the first embodiment, the reflection optical system 173 has a dichroic mirror (fourth optical system) 74 and a total reflection mirror (fifth optical system) 75. The dichroic mirror 74 transmits the blue light BL, the red light RL, and the red light (part of light) RL that belongs to the red wavelength band among the green lights GL1 and GL2 contained in the yellow light YL reflected from the light guide optical system 45, and reflects the blue light BL and the green light GL that includes the green lights GL1 and GL2, which are other color lights, to the wavelength conversion device 50A. The total reflection mirror 75 causes the optical path of the red light RL transmitted through the dichroic mirror 74 to coincide with the optical paths of the blue light BL and the green light GL reflected by the dichroic mirror 74.

[0107] In the light source device 110 of the first embodiment, the chief ray of the blue light BL and the chief ray of the green light GL reflected by the dichroic mirror 74 of the reflection optical system 173 can be made to coincide with and overlap with the chief ray of the red light RL transmitted through the dichroic mirror 74 and reflected by the total reflection mirror 75. According to the light source device 110 of the first embodiment, even if the degree of light flux reduction in the optical path of the blue light BL emitted from the first light source 11 and the optical path of the red light RL emitted from the second light source 12 in the light flux reduction optical system 130 is weak and the chief rays of the colored lights, i.e., the blue light BL, the red light RL, and the green light GL, do not coincide with each other before entering the reflection optical system 173, the optical axes of the colored lights can be aligned by the dichroic mirror 74 and the total reflection mirror 75.

[0108] The projector 10 of the first embodiment includes the light source device 110 of the first embodiment described above, light modulation devices 400R, 400G, and 400B, and a projection optical system 600. The light modulation devices 400R, 400G, and 400B modulate the red light (light) RL, green light (light) GL, and blue light (light) BL emitted from the light source device 110 according to image information, convert them into image light of each color, and emit them. The projection optical system 600 projects the image light of each color emitted from the light modulation devices 400R, 400G, and 400B.

[0109] According to the projector 10 of the first embodiment, the light source is Wavelength conversion deviceEven if the light source device 110 includes the phosphors, i.e., light conversion layers 61, 66, a first light source 11 that emits blue light BL as excitation light capable of exciting the phosphors, and a second light source that emits red light RL as light of a different color from the blue light BL, it is possible to prevent the device from becoming large.

[0110] Second embodiment Next, a projector and a light source device according to a second embodiment of the present invention will be described with reference to Fig. 9 to Fig. 12. In the description of the second and subsequent embodiments, content common to the first embodiment will be omitted, and configurations common to the projector 10 and light source device 110 of the first embodiment will be denoted by the same reference numerals as the corresponding configurations in the projector 10 and light source device 110. In the description of the second embodiment and each of the modified examples, only configurations and content that are different from the configurations already described in the first embodiment will be described.

[0111] Although not shown, the projector of the second embodiment includes a light source device 112 of the second embodiment, which will be described next, instead of the light source device 110 in the projector 1 of the first embodiment.

[0112] Fig. 9 is a schematic diagram of a light source device 112 of the second embodiment. Fig. 10 is a perspective view of the first light source 11, the second light source 12, and the condensing element 36 of the light beam reduction optical system 130 of the light source device 110. In Fig. 10, the contour lines of each light source are omitted. As shown in Figs. 9 and 10, the light source device 112 includes the first light source 11, the second light source 12, the light beam reduction optical system 130, the homogenizing element 40, the light guiding optical system 45, the lens 81, the wavelength conversion device 50B, the reflection optical system 173, the superimposing lens 82, and the rod lens 85, and further includes a third light source 13.

[0113] The third light source 13 is disposed at a position overlapping with the first light source 11 and the second light source 12 in the X direction, and is disposed at a distance from the first light source 11 and the second light source 12 in a plane including the Y direction and the Z direction. The third light source 13 is disposed at a position overlapping with some of the light sources 21 of the first light source 11 in the Y direction, for example, and is disposed on the +Y side of the second light source 12 as a position different from the second light source 12. The third light source 13 is disposed at a position overlapping with another some of the light sources 21 of the first light source 11 in the Z direction, and is disposed at a position overlapping with some of the light sources 22 of the second light source 12 in the Z direction, for example.

[0114] The third light source 13 emits green light GL3 in a third green wavelength band, which is not the same as a first green wavelength band and a second green wavelength band described later, toward the +X side along the X direction. The green light GL3 emitted from the third light source 13 corresponds to the fifth light. The third green wavelength band is included in the green wavelength band and corresponds to the fifth wavelength band. In the second embodiment, the third green wavelength band is not the same as the second green wavelength band of the green light GL2 emitted from the light conversion layer 66, and is assumed to be a wavelength band that does not overlap with the second green wavelength band, for example, a wavelength band of 520 nm to 550 nm. Note that the third green wavelength band may partially overlap with the second green wavelength band within a range belonging to green.

[0115] The third light source 13 has at least one light source 23 and the same number of collimating elements 27 as the light sources 23. The light source 23 is arranged with the emission surface facing the +X side. The light source 23 emits green light GL3 to the +X side along the X direction. The green light GL3 is diverged from the emission surface of the light source 23 with the X direction as the center. The number of light sources 23 included in the third light source 13 is appropriately set in consideration of the light amount required for the green light GL in the light source device 112, the light amounts of the green lights GL1, GL2, and GL3 emitted from the wavelength conversion device 50B, and the light amount of the green light GL3 emitted from one light source 23. The light source 23 is, for example, an LD that emits green light GL3.

[0116] The collimating element 27 is disposed on the optical path of the green light GL3 emitted from the light source 23. The collimating element 27 is disposed at a position overlapping with the light source 23 in the Y and Z directions, and is disposed on the +X side of the light source 23 in the X direction. The incident surface of the collimating element 27 faces the exit surface of the light source 23. The collimating element 27 collimates the green light GL3 emitted from the light source 23 in a radially diverging state about an optical axis parallel to the X direction, and emits the collimated green light GL3 to the +X side along the X direction.

[0117] The parallelizing element 27 is, for example, a plano-convex lens that faces a convex curved surface toward the emission side of the green light GL3. Note that the parallelizing element 27 is an optical element that can parallelize the incident green light GL3 as described above, and is not limited to a plano-convex lens, and may be, for example, a biconvex lens, or may be an optical element other than a plano-convex lens or a biconvex lens.

[0118] In the third light source 13, similarly to the first light source 11 and the second light source 12, one light source 23 and a collimating element 27 arranged corresponding to one light source 23 may be integrated into one package. The multiple light sources 23 and the multiple collimating elements 27 may be integrated on a common substrate (not shown) or the like as described in the first embodiment, while maintaining the relative arrangement of the light sources 23 and the collimating elements 27 in one-to-one correspondence in a plane including the Y direction and the Z direction, and may be packaged as one array light source 15 together with the first light source 11 and the second light source 12.

[0119] The dichroic mirror 71 of the light guide optical system 45 reflects the green light GL1, GL2 incident from the +X side along the X direction after being emitted from the light conversion layers 61, 66 of the wavelength conversion device 50B, and emits it to the +Y side along the Y direction. The dichroic mirror 71 transmits the green light GL3 incident from the -X side and the +X side along the X direction, and emits it to the +X side and the -X side. FIG. 11 is a graph showing an example of the transmittance characteristic of the dichroic mirror 71 in the light source device 112. The peak wavelengths of the transmittance in the graph of FIG. 11 correspond to the peak wavelength of the blue light BL, the peak wavelength of the green light GL3, and the peak wavelength of the red light RL, in order from the low wavelength side. As illustrated in FIG. 11, the reflecting surface of the dichroic mirror 71 reflects the green light GL1, GL2, and transmits the green light GL3 in a wavelength band different from the blue light BL, the red light RL, and the green light GL1, GL2.

[0120] Total reflection mirror 72 reflects the blue light BL, red light RL, and green light GL3 that are transmitted through dichroic mirror 71 and enter from the +X side along the X direction, emits them to the +Y side along the Y direction, and superimposes the blue light BL, red light RL, and green light GL3 on the green lights GL1 and GL2 reflected by dichroic mirror 71. The reflective surface of total reflection mirror 72 reflects the blue light BL, red light RL, and green light GL3.

[0121] The lens 81 is disposed so as to overlap with the optical paths of the blue light BL and red light RL emitted from the dichroic mirror 71 of the light-guiding optical system 45, the optical path of the green light GL3, and the optical paths of the blue light BL, red light RL, and green light GL3 emitted from the wavelength conversion device 50B. The lens 81 deflects the blue light BL, red light RL, and green light GL3 emitted from the dichroic mirror 71 through the dichroic mirror 71 of the light-guiding optical system 45, and collects the blue light BL and red light RL on the wavelength conversion device 50B to make them incident from the -X side, and collects the blue light BL and green light GL3 on the wavelength conversion device 50B to make them incident from the -X side.

[0122] Specifically, the lens 81 emits the blue light BL, red light RL, and green light GL3 incident from the -X side along the X direction through the dichroic mirror 71 of the light guiding optical system 45 to the +X side and -Y side, and converges them toward the light conversion layer 61. At this time, the blue light BL, red light RL, and green light GL3 are incident on a portion of the lens 81 on the +Y side of the central axis in the Y direction. The lens 81 collimates the blue light BL, red light RL, and green light GL3 incident from the +X side and +Y side, which are reflected by the wavelength selective reflection layers 63, 64, and 68 of the wavelength conversion device 50B as described later, and emits them to the -X side along the X direction. At this time, the blue light BL, red light RL, and green light GL3 are incident on a portion of the lens 81 on the -Y side of the central axis in the Y direction. The optical paths from the -X side to the +X side of the blue light BL, red light RL, and green light GL3 emitted from the light-guiding optical system 45, passing through the lens 81, and reaching the wavelength conversion device 50B are different from the optical paths from the +X side to the -X side of the blue light BL, red light RL, and green light GL3 emitted from the wavelength conversion device 50B, passing through the lens 81, and reaching the light-guiding optical system 45.

[0123] In the light source device 112, the wavelength converter 50B has a driving device 52, a substrate 54, a diffusion layer 60, light conversion layers 61 and 66, and wavelength selective reflection layers 63 and 64, and further has a wavelength selective reflection layer 68. The wavelength converter 50B corresponds to a light conversion element.

[0124] FIG. 12 is a schematic diagram of the wavelength converter 50B of the light source device 112, and is a diagram of the wavelength converter 50B when viewed from the -X side along the X direction and the rotation axis JX. FIG. 13 is a cross-sectional view of the wavelength converter 50B of FIG. 12, and is a diagram when viewed along the XIII-XIII line shown in FIG. 12. As shown in FIG. 12 and FIG. 13, the wavelength selective reflection layer 68 is provided on the surface of the -X side of the light conversion layer 66 via the adhesive layer 65. The surface of the -X side of the light conversion layer 66 corresponds to the light incident surface. Note that the wavelength selective reflection layer 68 may be laminated on the surface of the -X side of the light conversion layer 66, and the adhesive layer 65 may be omitted. The wavelength selective reflection layer 68 reflects the green light GL3 emitted from the third light source 13 and incident on the wavelength selective reflection layer 68. The wavelength selective reflection layer 68 corresponds to the second wavelength selective reflection layer. The wavelength-selective reflecting layer 68 reflects the green light GL3 emitted from the third light source 13 and incident from the -X side and the +Y side to the -X side and -Y side, and disperses it. The wavelength-selective reflecting layer 68 reflects to the +X side the green light GL2 in the same wavelength band as the green light GL3 among the green light GL2 emitted from the light conversion layer 66 and incident from the +X side, and transmits the green light GL2 in a wavelength band different from the green light GL3 among the green light incident from the +X side and the blue light BL incident from the +X side and the -X side. The wavelength-selective reflecting layer 64 is composed of, for example, a dielectric multilayer film capable of wavelength-selectively regular reflecting the green light GL3 in the third green wavelength band among the light in the visible wavelength band.

[0125] The dichroic mirror 74 of the reflection optical system 173 reflects the green light GL1, GL2, and GL3 emitted from the dichroic mirror 71 of the light-guiding optical system 45 and the blue light BL emitted from the total reflection mirror 72 to the +X side, i.e., the wavelength conversion device 50B side, along the X direction, and transmits the red light RL emitted from the total reflection mirror 72 to the +Y side along the Y direction. Specifically, the dichroic mirror 74 reflects the blue light BL and green light GL3 emitted from the total reflection mirror 72 along the Y direction and incident from the -Y side, and emits them to the +X side along the X direction, and transmits the red light RL emitted from the total reflection mirror 72 along the Y direction and incident from the -Y side, and emits them to the +Y side along the Y direction.

[0126] The superimposing lens 82 collects the blue light BL, red light RL, and green light GL3 emitted from the double-sided lens array 41 and emitted from the reflection optical system 173 through the dichroic mirror 71, the lens 81, and the wavelength conversion device 50B of the light-guiding optical system 45, and the green lights GL1 and GL2 generated due to the multiple small beams of the blue light BL, red light RL, and green light GL3, and emits them to the +X side along the X direction. The superimposing lens 82 cooperates with the multiple microlenses 42 and 43 of the double-sided lens array 41 to superimpose the blue light BL, red light RL, and green light GL1, GL2, and GL3 on each other in the image formation areas of the aforementioned optical modulation devices 400R, 400G, and 400B, or in the vicinity of the image formation areas on the optical paths of the colored lights.

[0127] The rod lens 85 propagates the blue light BL, red light RL, and green light GL1, GL2, and GL3 that are emitted from the diffusion layer 60 on the +Y side of the wavelength conversion device 50B in a state in which they are diverged to the +X side with the X direction as the center and diffused within a plane including the Y and Z directions and enter from the -X side to the +X side along the axis, and homogenizes the light intensity distribution of the blue light BL, red light RL, and green light GL1, GL2, and GL3 within the plane including the Y and Z directions. The rod lens 85 emits the homogenized blue light BL, red light RL, and green light GL1, GL2, and GL3 to the +X side along the X direction from the end face on the +X side.

[0128] In the light source device 112 having the above-mentioned configuration, the light source 23 of the third light source 13 is connected to a control device (not shown). The control device supplies an electric signal of a predetermined voltage to the multiple light sources 21 of the first light source 11, supplies an electric signal of a predetermined voltage for a predetermined lighting time to the light source 22 of the second light source 12, and supplies an electric signal of a predetermined voltage for a predetermined lighting time to the light source 23 of the third light source 13. In other words, the control device performs pulse control of the second light source 12 and the third light source 13.

[0129] The control device drives the drive device 52 of the wavelength converter 50B to rotate the substrate 54 around the rotation axis JX while supplying electrical signals to the multiple light sources 21 and the light sources 22 and 23. The control device synchronizes the emission of blue light BL from the multiple light sources 21, the emission of red light RL from the multiple light sources 22, the emission of green light GL3 from the multiple light sources 23, and the rotation of the substrate 54. The control device supplies a power signal to the light source 22 to cause the red light RL emitted from the lens 81 and incident on the wavelength converter 50B to be incident on the wavelength selective reflection layer 64 during the lighting period when the red light RL is emitted from the multiple light sources 22, and supplies a power signal to the light source 23 to cause the green light GL3 emitted from the light source 23 to be incident on the wavelength selective reflection layer 68. The control device adjusts the timing at which the light source 23 starts emitting green light GL3 to the timing at which red light RL entering the wavelength conversion device 50B from the lens 81 enters one end of the wavelength selective reflection layer 68 in the circumferential direction centered on the rotation axis JX.

[0130] In the light source device 112, the optical paths and behaviors of the blue light BL and red light RL after being emitted from the multiple light sources 21 of the first light source 11 until being emitted from the rod lens 85, and the optical paths and behaviors of the green lights GL1 and GL2 after being emitted from the wavelength conversion device 50B until being emitted from the rod lens 85 are similar to the optical paths and behaviors of each color light of the light source device 110.

[0131] The green light GL3 emitted from the light source 23 of the third light source 13 is collimated by the collimating element 27, and merges with the optical paths of the blue light BL and red light RL by reducing the light beam by the light beam reduction optical system 130, and is emitted from the light beam reduction optical system 130 to the +X side along the X direction. The green light GL3 emitted from the light beam reduction optical system 130 passes through the homogenizing element 40. The optical path and behavior of the green light GL3 from being emitted from the homogenizing element 40 to being incident on the wavelength conversion device 50B are similar to the optical paths and behavior of the blue light BL and red light RL within the same range.

[0132] The green light GL3 collected by the lens 81 is incident on the wavelength-selective reflecting layer 68 from the -X side and the +Y side because the substrate 54 of the wavelength converter 50B is rotated in the circumferential direction around the rotation axis JX by the driving device 52 and the rotation of the substrate 54 is synchronized with the lighting of the green light GL3 from the third light source 13. The green light GL3 incident on the wavelength-selective reflecting layer 68 is reflected and reflected by the wavelength-selective reflecting layer 68. 68 It is emitted to the -X side and the -Y side from the center and diverges.

[0133] In the light source device 112 of the second embodiment, as in the light source device 110 of the first embodiment, when the rotation speed of the substrate 54 around the rotation axis JX by the driving device 52 is, for example, T0 [seconds / rotation], and the plate surface 54a of the substrate 54 is equally divided into four regions in the circumferential direction, the time period during which the green light GL3 is emitted from the wavelength conversion device 50B once, i.e., the predetermined emission time of the green light GL3, is T0 × (1 / 4) [seconds], and the time during which the green light GL3 is not emitted is T0 × (1 / 4) [seconds]. The timing and time period during which the green light GL3 is emitted are different from the timing and time period during which the red light RL is emitted. The green light GL3 is emitted twice when the substrate 54 rotates once. When the substrate 54 rotates once, for example, blue light BL, red light RL, and green light GL1 are emitted from the wavelength conversion device 50B for T0 x (1 / 4) [seconds], then blue light BL and green lights GL2 and GL3 are emitted for T0 x (1 / 4) [seconds], then only blue light BL is emitted for T0 x (1 / 4) [seconds], and then blue light BL and green lights GL2 and GL3 are emitted again for T0 x (1 / 4) [seconds]. In the control device, the lighting time of each color light, the conditions of the electrical signals supplied to the multiple light sources 21 of the first light source 11, the light source 22 of the second light source 12, and the light source 23 of the third light source 13, and the like are adjusted and appropriately set according to the light amount required for the blue light BL, green lights GL1, GL2, GL3, and red light RL emitted from the light source device 112 and the light amount ratio in the color lights.

[0134] The optical path and behavior of the green light GL3 from the wavelength converter 50B through the rod lens 85 to the color separation optical system 200 in FIG. 1 are similar to the optical path and behavior of the blue light BL within the same range.

[0135] The light source device 112 of the second embodiment described above includes at least the first light source 11, the second light source 12, the wavelength conversion device (light conversion element) 50B, the light beam reduction optical system 130, and the light guide optical system 45. According to the light source device 112 of the second embodiment, as with the light source device 110 of the first embodiment, even if the light source device 112 includes the first light source 11 that emits blue light BL as excitation light capable of exciting the phosphor of the wavelength conversion device 50B and the second light source that emits red light RL as color light different from the blue light BL, it is possible to suppress an increase in size. The light source device 112 of the second embodiment includes components and a configuration in common with the light source device 110 of the first embodiment, and therefore achieves the same effects as those described above based on the components and configuration in common with the light source device 110 of the first embodiment.

[0136] The light source device 112 of the second embodiment further includes a third light source 13. The third light source 13 emits green light (fifth light) GL3 in a second green wavelength band (fifth wavelength band) included in the green wavelength band. In the light source device 112 of the second embodiment, the light beam reduction optical system 130 causes the optical path of the green light GL3, the optical path of the blue light BL, and the optical path of the red light RL to coincide with each other.

[0137] In the light source device 112 of the second embodiment, in addition to the first light source 11 that emits blue light BL and the second light source 12 that emits red light RL as in the light source device 110 of the first embodiment, a third light source 13 that emits green light GL3 is used as a light source of colored light. According to the light source device 112 of the second embodiment, the optical path of the green light GL3 is made to coincide with the optical path of the blue light BL and the optical path of the red light RL by the light beam reduction optical system 130, so that the size can be suppressed compared to the light source device 110.

[0138] In the light source device 112 of the second embodiment, the wavelength conversion device 50B further includes a wavelength selective reflection layer (second wavelength selective reflection layer) 68. The wavelength selective reflection layer 68 is disposed on the surface (light incident surface) on the -X side of the light conversion layer (second light conversion layer) 66, and reflects green light GL3.

[0139] In the light source device 112 of the second embodiment, by specularly reflecting the blue light BL on the reflective layer 55 and specularly reflecting the green light GL3 on the wavelength selective reflective layer 68, when the blue light BL and the green light GL3 are incident from a direction inclined with respect to the direction perpendicular to the surface of each reflective layer, they can be emitted in a direction different from the direction at which they entered. According to the light source device 112 of the second embodiment, the optical paths of the blue light BL and the green light GL3 at the time of emission from the wavelength converter 50B can be easily shifted from the optical paths at the time of incidence into the wavelength converter 50B.

[0140] In the light source device 112 of the second embodiment, the optical axis of the blue light BL emitted from the first light source 11 after being emitted from the light flux reduction optical system 130 coincides with the optical axis of the green light GL3 emitted from the third light source 13. The optical axis of the red light RL emitted from the second light source 12 is shifted from the optical axis of the blue light BL and the optical axis of the green light GL3.

[0141] In the light source device 112 of the second embodiment, the optical axes of two colored lights, such as blue light BL and green light GL3, are aligned with each other in the light beam reduction optical system 130 on the optical path of the colored lights, thereby preventing an increase in the number of parts and an increase in the size of the entire device.

[0142] (Modification of the second embodiment) Next, a modified example of the light source device 112 of the second embodiment will be described with reference to Fig. 14 to Fig. 17. The light source device 112 of the second embodiment may include a wavelength conversion device 50C, which will be described next, instead of the wavelength conversion device 50B.

[0143] FIG. 14 is a schematic diagram of the wavelength converter 50C, and is a diagram of the wavelength converter 50C when viewed from the -X side along the X direction and the rotation axis JX. FIG. 15 is a cross-sectional view of the wavelength converter 50C, and is a diagram when viewed along the XV-XV line shown in FIG. 14. FIG. 16 is a cross-sectional view of the wavelength converter 50C, and is a diagram when viewed along the XVI-XVI line shown in FIG. 14. Note that the driving device 52 is omitted in FIGS. 14 to 16. As shown in FIGS. 14 to 16, the wavelength converter 50C has the driving device 52, the substrate 54, the diffusion layer 60, the light conversion layers 61 and 66, and the wavelength selective reflection layers 63, 64, and 68, and further has filter layers 62R and 62G. The wavelength converter 50C corresponds to a light conversion element.

[0144] In the wavelength converter 50C, the outer peripheral end of the plate surface 54a of the substrate 54 is partitioned in the circumferential direction about the rotation axis JX into the same number of regions as the inner peripheral portion, for example, into four regions within an angular range of 90°. The circumferential boundary lines of the regions of the outer peripheral end coincide with the circumferential boundary lines of the regions of the inner peripheral portion.

[0145] The filter layer 62R is provided on the surface on the -X side of the diffusion layer 60 provided in a region that is point-symmetrical with respect to the rotation axis JX with respect to the region in which the light conversion layer 61 and the wavelength selective reflection layer 64 are arranged among a plurality of regions in the circumferential direction centered on the rotation axis JX of the plate surface 54a of the substrate 54, and is laminated on the diffusion layer 60 in the X direction. The filter layer 62R transmits red light RL of a desired red wavelength band emitted from the light source device 112 within the red wavelength band, and absorbs or reflects color light other than the desired red wavelength band within the visible wavelength band. The filter layer 62R is formed, for example, of a dichroic film that transmits red light RL of a desired red wavelength band.

[0146] The filter layer 62G is provided on the surface on the -X side of the diffusion layer 60 provided in a region that is point-symmetrical with respect to the rotation axis JX with respect to the region in which the light conversion layer 66 and the wavelength selective reflection layer 68 are arranged among a plurality of regions in the circumferential direction centered on the rotation axis JX of the plate surface 54a of the substrate 54, and is laminated on the diffusion layer 60 in the X direction. The filter layer 62G transmits green light GL of a desired green wavelength band emitted from the light source device 112 in the second green wavelength band, and absorbs or reflects color light other than the desired green wavelength band in the visible wavelength band. The filter layer 62G is formed, for example, of a dichroic film that transmits green light GL of the desired green wavelength band.

[0147] The dichroic film constituting the filter layers 62R, 62G may be formed directly on the -X side surface of the diffusion layer 60, or may be formed on the surface of a transparent substrate such as a glass substrate (not shown) and bonded to the -X side surface of the diffusion layer 60 via an adhesive or the like as a laminate with the transparent substrate.

[0148] When the light source device 112 of the second embodiment is equipped with a wavelength conversion device 50C, the optical path and behavior of the blue light BL emitted from the first light source 11 to enter the diffusion layer 60 of the wavelength conversion device 50C, the optical path and behavior of the red light RL emitted from the second light source 12 to enter the diffusion layer 60 of the wavelength conversion device 50C, the optical path and behavior of the green light GL3 emitted from the third light source 13 to enter the diffusion layer 60 of the wavelength conversion device 50C, and the optical path and behavior of the green light GL1, GL2 emitted from the light conversion layers 61, 66 of the wavelength conversion device 50C to enter the diffusion layer 60 are similar to the optical paths and behavior of the blue light BL, red light RL, and green light GL1, GL2, GL3 within the same range described in the second embodiment.

[0149] The blue light BL is emitted from the reflection optical system 173 to the +X side along the X direction and collected by the lens 82. The blue light BL is diffused by the diffusion layer 60 and diverges again, passes through the rod lens 85, and enters the color separation optical system 200 in FIG. 1.

[0150] FIG. 17 is a schematic diagram of a part of a modified example of the light source device 112, and is a diagram for explaining the optical paths and behaviors of the blue light BL, the green light GL1, BL2, and the red light RL after being emitted from the wavelength conversion device 50C until being emitted from the rod lens 85. In FIG. 17, only the center, optical axis, and principal ray of the colored light are shown, and the superimposing lens 82 is omitted. As shown in FIG. 17, the red light RL emitted from the reflection optical system 173 to the +X side along the X direction and collected by the lens 82 passes through the filter layer 62R and is converted into red light RL of a desired red wavelength band among the incident red light RL. The red light RL of the desired red wavelength band enters the diffusion layer 60 from the -X side, is diffused by the diffusion layer 60 and diverges again, is emitted from the diffusion layer 60 to the +X side along the X direction, passes through the rod lens 85, and enters the color separation optical system 200 of FIG. 1. The green light GL1 is emitted from the total reflection mirror 73 to the +X side along the X direction at the same timing and time period as the red light RL and collected by the lens 82, and is absorbed or reflected by the filter layer 62R.

[0151] The green light GL2, GL3 emitted from the reflection optical system 173 to the +X side along the X direction and collected by the lens 82 passes through the filter layer 62G and is converted into green light GL of a desired green wavelength band among the incident green light GL2, GL3. The green light GL of the desired green wavelength band enters the diffusion layer 60 from the -X side, is diffused by the diffusion layer 60 and diverges again, is emitted from the diffusion layer 60 to the +X side along the X direction, passes through the rod lens 85, and enters the color separation optical system 200 in FIG.

[0152] As a result, blue light BL, green light GL in a desired green wavelength band, red light RL in a desired red wavelength band, and green light GL in a desired green wavelength band are emitted from the rod lens 85 in time series.

[0153] In a modified example of the light source device 112 of the second embodiment, in a wavelength conversion device 50C, the filter layers 62R, 62G are provided in a region (position) different from the light conversion layer 61 in the radial direction centered on the rotation axis JX of the substrate 54. The filter layers 62R, 62G transmit only the red light RL in a desired red wavelength band (predetermined wavelength band) and the green light GL in a desired green wavelength band (predetermined wavelength band) out of the colored light (light) including the blue light BL, red light RL, and green lights GL1, GL2, GL3 emitted from the total reflection mirror (third optical system) 73.

[0154] In the modified example of the light source device 112 of the second embodiment, one wavelength converter 50C has a light conversion function of converting blue light BL into green light GL1, GL2, and a filter function of filtering red light RL in a desired red wavelength band and green light GL in a desired green wavelength band to be enlarged and projected on the screen SCR from among the red light RL and green light GL1, GL2. According to the modified example of the light source device 112 of the second embodiment, it is possible to reduce the number of parts and achieve miniaturization.

[0155] (Modification of the first embodiment <1> ) Next, a description will be given of a modified example of the light source device 110 of the first embodiment. The light source device 110 of the first embodiment may include a wavelength conversion device, which will be described next, instead of the wavelength conversion device 50A.

[0156] Although not shown, a modified example of the first embodiment <1> The wavelength conversion device includes a driving device 52, a substrate 54, a diffusion layer 60, light conversion layers 61 and 66, and wavelength selective reflection layers 63, 64, and 68, and further includes a transparent substrate, and corresponds to a light conversion element. <1> In this wavelength converter, in the wavelength converter 50A of the first embodiment, a transparent substrate is provided instead of the diffusion layer 60 in a plurality of regions in the circumferential direction centered on the rotation axis JX of the substrate 54, and in a region within the radial range that is point-symmetrical with respect to the rotation axis JX with respect to the region in which the light conversion layer 66 is provided. The transparent substrate is made of a material that transmits color light in the visible wavelength range, and is, for example, an optical glass substrate. When the transparent substrate is made of optical glass, the diffusion layer 60 and the transparent substrate may be alternately connected in the circumferential direction centered on the rotation axis JX of the substrate 54.

[0157] Variations <1> In this wavelength conversion device, the optical path and behavior of the blue light BL emitted from the first light source 11 until it is emitted from the rod lens 85 are the same as those of the blue light BL within the same range described in the second embodiment. The optical path and behavior of the red light RL emitted from the second light source 12 until it is emitted from the rod lens 85, and the optical path and behavior of the green light GL1 emitted from the light conversion layer 61 until it is emitted from the rod lens 85 are the same as those of the modified example. <1> The optical paths and behavior of the red light RL and green light GL1 within the same range are similar to those described for the wavelength conversion device 50C.

[0158] Variations <1> In this wavelength conversion device, the optical path and behavior of the green light GL2 emitted from the light conversion layer 66, emitted from the lens 82, and collected by the lens 82 are similar to the optical path and behavior of the green light GL2 within the same range described in the first embodiment. <1> 1. The light passes through the transparent substrate of the wavelength converter, diverges again from the transparent substrate, passes through rod lens 85, and enters color separation optical system 200 of FIG.

[0159] The uniformity of the light intensity distribution in a plane perpendicular to the optical axis of the green light GL2 generated as fluorescence is lower than the uniformity of the light intensity distribution in a plane perpendicular to the optical axis of the blue light BL and the red light RL emitted from the LD. The light intensity distribution is The green light GL having good uniformity is emitted and enters the color separation optical system 200. <1> According to a light source device including this wavelength conversion device, the same effects as those of the light source device 110 of the first embodiment can be obtained.

[0160] (Modification of the first embodiment <2> ) Next, another modified example of the light source device 110 of the first embodiment will be described with reference to Fig. 18 and Fig. 19. Fig. 18 shows a modified example of the first embodiment. <2> 18 is a schematic diagram of a light source device 114. As shown in Fig. 18, the light source device 114 is provided with an optical element 171 described next, instead of the dichroic mirror 71 of the light guiding optical system 45 in the light source device 110 of the first embodiment.

[0161] FIG. 19 is a front view of the optical element 171, and is a view of the optical element 171 when viewed from the +X side and +Y side toward the -X side and -Y side. The optical element 171 corresponds to the first optical system, and is composed of a substrate having a flat reflecting surface. As shown in FIG. 19, through holes H1 to H3 are formed in the optical element 171. The reflecting surface of the optical element 171 is inclined with respect to the X direction and the Y direction when viewed along the Z direction, and is arranged so as to move from the +Y side to the -Y side as it moves from the -X side to the +X side. The reflecting surface of the optical element 171 reflects color light in the visible wavelength band. The reflecting surface of the optical element 171 is composed of a dichroic film capable of reflecting, for example, green light GL1 and GL2.

[0162] The optical element 171 includes a plurality of regions AR1 to AR6. The region AR1 corresponds to a first region, and is a region located in the Y direction along the plate surface between the incidence region of the blue light BL and the red light RL that are reflected by the total reflection mirror 72 of the light guiding optical system 45 and enter from the -Y side along the Y direction and the incidence region of the blue light BL and the red light RL that are emitted from the homogenizing element 40 and enter from the -X side along the X direction. The region AR2 corresponds to a second region, and is a region located in the Y direction between the incidence region of the blue light BL and the red light RL that are emitted from the wavelength conversion device 50A and enter from the +X side along the X direction through the lens 81 and the incidence region of the blue light BL and the red light RL that are reflected by the total reflection mirror 72 and enter from the -Y side along the Y direction. The region AR3 is a region located on the -Y side of the incidence region of the blue light BL and the red light RL that are emitted from the wavelength conversion device 50A and enter from the +X side along the X direction through the lens 81.

[0163] The region AR4 corresponds to the fourth region and is located between the region AR1 and the region AR2 in the Y direction. The blue light BL and the red light RL reflected by the total reflection mirror 72 are incident on the region AR4 from the -Y side along the Y direction. The region AR5 corresponds to the fifth region and is located between the region AR2 and the region AR3 in the Y direction. The blue light BL and the red light RL emitted from the wavelength conversion device 50A and then emitted along the X direction by the lens 81 are incident on the region AR5. The region AR6 includes a region where the blue light BL and the red light RL emitted from the homogenizing element 40 are incident from the -X side along the X direction, and is located on the +Y side of the region AR1.

[0164] The through hole H1 is formed in the region AR6 in the Y direction and the Z direction in a range including the incidence region of the blue light BL and red light RL emitted from the homogenizing element 40. The through hole H2 is formed in the region AR4 in a range including the incidence region in the Y direction of the blue light BL and red light RL reflected by the total reflection mirror 72. The through hole H3 is formed in a range including the incidence region of the blue light BL and red light RL emitted from the wavelength conversion device 50A, passing through the lens 81, and incident on the optical element 171 from the +X side along the X direction.

[0165] In the optical element 171, a reflective film 176 is provided on the +X-side plate surface of the substrate made of optical glass except for the region where the through holes H1 to H3 are formed, that is, except for the incidence region of the blue light BL and the red light RL emitted from the wavelength converter 50A through the lens 81 and then emitted from the lens 81 to the -X side along the X direction, except for the incidence region of the blue light BL and the red light RL reflected by the total reflection mirror 72 and emitted to the +Y side along the Y direction, and except for the incidence region of the blue light BL and the red light RL emitted from the homogenizing element 40 and incident from the -X side along the X direction. The reflective film 176 is, for example, a dichroic film that selectively reflects the green light GL1 of the first green wavelength band and the GL2 of the second green wavelength band in a wavelength-selective manner.

[0166] Variations <2> In the light source device 114, the optical path and behavior of the blue light BL emitted from the first light source 11 until it is emitted from the rod lens 85, the optical path and behavior of the red light RL emitted from the second light source 12 until it is emitted from the rod lens 85, and the optical path and behavior of the green light GL1, GL2 emitted from the wavelength conversion device 50A until it is emitted from the rod lens 85 are similar to the optical paths and behaviors of the blue light BL, the red light RL, and the green light GL1, GL2 within the same range in the light source device 110 described in the first embodiment. However, at least a part of the green light GL1, GL2 emitted from the lens 81 after being emitted from the wavelength conversion device 50A is reflected by the reflective film 176 of the optical element 171 and is emitted to the +Y side along the Y direction. The remaining part of the green light GL1, GL2 passes through the through holes H1 to H3 and is emitted to the -X side of the optical element 171, so it does not reach the rod lens 85 and is lost.

[0167] Modification of the first embodiment <2> According to the light source device 114, the same effects as those of the light source device 110 of the first embodiment can be obtained.

[0168] Modification of the first embodiment <2> In this light source device 114, the optical element (first optical system) 171 of the light guide optical system 45 has regions (first region to fifth region) AR1 to AR5 that reflect the green light GL1 included in the yellow light (third light) YL. The region (fourth region) AR4 is located between the region (first region) and the region (second region) in the Y direction, and is disposed in the center of the optical element 171 in the Y direction. The region AR5 is disposed between the region AR2 and the region AR3 in the Y direction. Modification of the First Embodiment <2> In the light source device 114, the blue light BL and the red light RL emitted from the wavelength conversion device 50A pass through a through hole H3 formed in the region (fifth region) AR5. The blue light BL and the red light RL emitted from the total reflection mirror (second optical system) 72 of the light guide optical system 45 pass through a through hole H2 formed in the region (fourth region) AR4.

[0169] Modification of the first embodiment <2> According to the light source device 114, the centers of the green lights GL1 and GL2 reflected by the reflecting surface of the optical element 171 and the centers of the blue light BL and red light RL reflected by the reflecting surface of the total reflection mirror 72 can be brought closer to each other. This makes it possible to prevent the light source device 114 from becoming large.

[0170] Modification of the first embodiment <2> In the light source device 114, a through hole H2 is formed in the region AR4, a through hole H3 is formed in the region AR5, and a through hole H1 is formed in the region AR6.

[0171] Modification of the first embodiment <2> According to the light source device 114, the optical element 171 serving as the first optical system in the light guiding optical system 45 can be easily configured.

[0172] Modification of the first embodiment <2> In the light source device 114, the optical element 171 has, in the Y direction, a first reflecting element 181 consisting of an area AR1, a second reflecting element 182 consisting of an area AR2, and a third reflecting element 183 consisting of an area AR3. The first reflecting element 181, the second reflecting element 182, and the third reflecting element 183 have a reflecting film 176, and reflect green light GL1 of the yellow light (third light) YL emitted from the light conversion layer 61. Modification of the First Embodiment <2> In the light source device 114, the blue light BL and the red light RL emitted from the wavelength conversion device 50A pass between the second reflecting element 182 and the third reflecting element 183 in the Y direction, specifically, pass through the through hole H3 formed in the area AR5 between the second reflecting element 182 and the third reflecting element 183. The blue light BL and the red light RL emitted from the total reflection mirror (second optical system) 72 pass between the first reflecting element 181 and the second reflecting element 182 in the Y direction, specifically, pass through the through hole H2 formed in the area AR4 between the first reflecting element 181 and the second reflecting element 182.

[0173] Modification of the first embodiment <2> According to the light source device 114, the light guide optical system 45 can be easily configured. <2> In the light source device 114, the arrangement of each reflecting element can be appropriately adjusted to make the optical paths of the blue light BL and red light RL emitted from the light guide optical system 45 coincide with the optical paths of the green light GL1 and GL2.

[0174] As a further modified example, the first optical element 181 and the second optical element 182 may be separated from each other in the Y direction. Similarly, the second optical element 182 and the third optical element 183 may be separated from each other in the Y direction. In other words, the first optical element 181, the second optical element 182, and the third optical element 183 may be configured as separate bodies.

[0175] (Modification of the first embodiment <3> ) Next, another modified example of the light source device 110 of the first embodiment will be described with reference to Figs. 20 and 21. Although not shown, the modified example of the first embodiment <3> The light source device is a modification of the first embodiment. <2> Instead of the optical element 171 of the light guiding optical system 45 in the light source device 114, an optical element 172 which will be described next is provided.

[0176] 20 is a front view of the optical element 172, and is a view of the optical element 172 when viewed from the +X side and +Y side toward the -X side and -Y side. <3> The optical element 172 is a modification of the first embodiment. <2> 21 is an element in which a wavelength selective transmission film 175 is disposed in the through holes H1 to H3 of the optical element 171. The wavelength selective transmission film 175 transmits blue light BL in the blue wavelength band and red light RL in the red wavelength band, and reflects green light GL1 in the first green wavelength band and GL2 in the second green wavelength band. Fig. 21 is a graph showing an example of the transmittance characteristic of the wavelength selective transmission film 175. As shown in Fig. 21, the wavelength selective transmission film 175 is a dichroic film that selectively transmits blue light BL and red light RL as described above.

[0177] Modification of the first embodiment <3> In this light source device, the optical path and behavior of the blue light BL emitted from the first light source 11 until it is emitted from the rod lens 85, the optical path and behavior of the red light RL emitted from the second light source 12 until it is emitted from the rod lens 85, and the optical path and behavior of the green light GL1, GL2 emitted from the wavelength conversion device 50A until it is emitted from the rod lens 85 are similar to the optical paths and behaviors of the blue light BL, red light RL, and green light GL1, GL2 within the same range in the light source device 110 described in the first embodiment. However, the blue light BL and red light RL emitted from the lens 81 after being emitted from the wavelength conversion device 50A transmit through the wavelength selection transmission film 175, are emitted to the -X side of the optical element 171, are reflected by the total reflection mirror 72, and are emitted from the total reflection mirror 72 along the Y direction to the +Y side. At least a portion of the green light GL1, GL2 emitted from the lens 81 after being emitted from the wavelength conversion device 50A is reflected by the reflective film 176 of the optical element 171 and emitted to the +Y side along the Y direction. The remaining portion of the green light GL1, GL2 is also reflected by the wavelength selective transmission film 175 and emitted to the +Y side along the Y direction. Therefore, in the modified example of the first embodiment, <3> In this light source device, the green light GL 1 and GL 2 incident on the wavelength selective transmission film 175 is also guided to the rod lens 85 .

[0178] Modification of the first embodiment <3> According to this light source device, the same effects as those of the light source device 110 of the first embodiment can be obtained.

[0179] Modification of the first embodiment <3> In this light source device, the yellow wavelength band (third wavelength band) includes the green wavelength band (second wavelength band). A wavelength selective transmission film 175 is disposed in the regions AR4 and AR5. The wavelength selective transmission film 175 transmits blue light BL in the blue wavelength band and red light RL in the red wavelength band (second wavelength band) (a portion of light having a wavelength band including the second wavelength band) of the colored light (light) incident on the optical element 171 of the light guide optical system 45, and reflects other colored light (light), i.e., green light GL1 and GL2 in the green wavelength band.

[0180] Modification of the first embodiment <3> According to the light source device, the wavelength-selective transmission film 175 selectively transmits the incident blue light BL and red light RL and reflects the green light GL1 and GL2. <2> In comparison with the light source device 114, the loss of the green lights GL1 and GL2 in the light-guiding optical system 45 can be reduced.

[0181] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

[0182] For example, the projectors of the above-mentioned embodiments and modifications include a color separation optical system and three light modulation devices between the light source device and the projection optical system in the optical paths of the color light and the image light of each color, but instead of the color separation optical system and three light modulation devices, a single light modulation device having red, green, and blue color filters for each pixel may be provided, and the projectors may be configured as a single-panel projector. Also, the projectors of the above-mentioned embodiments and modifications may include a light modulation device consisting of a DMD (Digital Micromirror Device) instead of the color separation optical system and three light modulation devices.

[0183] FIG. 22 is a schematic diagram of a light source device 116 according to an example of the present invention, and is a schematic diagram of another modified example of the light source device 110 according to the first embodiment. As illustrated in FIG. 22, the light source device according to the present invention includes a first light source 11, a second light source 12, a light beam reduction optical system 130, a wavelength conversion device (light conversion element) 50D having a light conversion layer 61, a mirror 178 as a light guide optical system 45, and a collimator lens 185, and includes a light source device 116 having a simple configuration. The light conversion layer 61 transmits red light RL. The mirror 178 is disposed so that the reflection surface is inclined in the X and Y directions when viewed along the Z direction, similar to the dichroic mirror 71. The mirror 178 transmits colored light incident from the -X side and reflects colored light incident from the +X side. The collimator lens 185 outputs the colored light beams successively emitted from the dichroic mirror 71 to the +Y side, i.e., the blue light beam BL, the red light beam RL, and the green light beam GL, as white light beam WL. The white light beam WL is emitted toward, for example, the color separation optical system 200 of the projector 10 in FIG.

[0184] Furthermore, the wavelength selective reflecting layers 64, 68 may be formed directly on a plate surface 54a of the substrate 54 made of optical glass such as BK7, and disposed between the substrate 54 and the light conversion layers 61, 66 in the X direction. The wavelength selective reflecting layers 64, 68 may be formed directly on a plate surface 54b of the substrate 54 made of optical glass such as BK7. Furthermore, the substrate 54 may be formed of a diffusion plate having a diffusion angle of, for example, 1° to 5°.

[0185] Furthermore, in the light source device 100 of the first embodiment, the light guide optical system 45 includes the first optical system 71 and the second optical system 72, but the light guide optical system 45 may be composed of a single optical element. In that case, for example, the light guide optical system may be configured such that only the region where the blue light BL and the red light RL are incident from the -X side along the X direction is constituted by a mirror having wavelength selectivity to transmit the incident blue light BL and red light RL, and the other region is constituted by a reflecting mirror having reflection properties for all wavelength bands to reflect the incident blue light BL and red light RL.

[0186] In addition, in the light source device 110 of the second embodiment, the light guide optical system 45 includes the first optical system 71 and the second optical system 72, but the light guide optical system 45 may be composed of one optical element. In that case, for example, the light guide optical system may be configured so that only the region where the blue light BL, red light RL, and green light GL3 are incident from the -X side along the X direction is constituted by a mirror having wavelength selectivity to transmit the incident blue light BL, red light RL, and green light GL3, and the other region is constituted by a reflection mirror having reflection properties for all wavelength bands to reflect the incident blue light BL, red light RL, and green light GL3.

[0187] [Summary of this disclosure] The following is a summary of this disclosure. (Note 1) A first light source that emits a first light in a first wavelength band, a second light source that emits a second light in a second wavelength band different from the first wavelength band in parallel to the first light, and a second light source that converts the first light into a second light in a second wavelength band different from the first wavelength band. The third waveband a light conversion element for converting the first light emitted from the first light source into a third light; Chief ray and the second light emitted from the second light source Chief ray and a light guiding optical system that guides the first light and the second light emitted from the light beam reduction optical system to the light conversion element, wherein the light guiding optical system reflects the first light, the second light, and the third light emitted from the light conversion element.

[0188] According to the configuration of Supplementary Note 1, after the second light and the third light are combined, the colored lights from the first light to the third light are caused to follow the same optical paths until they reach the optical conversion element, so that the first light source and the second light source can be gathered in a spaced apart region, and the size of the light source device can be prevented from increasing. The light beam reduction optical system reduces the light beams of the first light and the second light, and causes the optical paths of the first light and the second light to coincide, thereby contributing to miniaturization.

[0189] (Appendix 2) The light source device of Appendix 1, wherein the light conversion element includes a substrate having a reflective layer, a first light conversion layer disposed on the reflective layer and converting the incident first light into the third light, and a first wavelength selective reflective layer disposed on the light incident surface of the first light conversion layer and reflecting the second light.

[0190] The configuration of Supplementary Note 2 makes it possible to specularly reflect the second light on the first wavelength selective reflection layer, i.e., on the light incident side, and to make the incident optical paths of the first light and the second light to the optical conversion element and the exit optical paths from the optical conversion element different from each other.

[0191] (Appendix 3) The light source device of Appendix 2, wherein the light-guiding optical system includes a first optical system and a second optical system, the first optical system reflects the third light emitted from the light conversion element, and the second optical system reflects the first light and the second light onto an optical path overlapping with the third light reflected by the first optical system.

[0192] In the configuration of Appendix 3, the second optical system arranged separately from the first optical system causes the optical paths of the first light and the second light to overlap with the optical path of the third light reflected by the first optical system, making it easy to control the illuminance distribution of each color light.

[0193] (Supplementary Note 4) The light source device according to Supplementary Note 3, wherein the second optical system is disposed on an opposite side of the first optical system from the light conversion element.

[0194] The configuration of Supplementary Note 4 allows the second optical system to be configured with simple optical elements.

[0195] (Supplementary Note 5) Any of the light source devices according to Supplementary Note 2 to Supplementary Note 4, further comprising a focusing optical system arranged on an optical path between the light guiding optical system and the light conversion element, wherein the focusing optical system causes the first light and the second light that have passed through the light guiding optical system to be incident on the light conversion element and causes light emitted from the light conversion element to be incident on the light guiding optical system, and the first light and the second light that have passed through the light guiding optical system to be incident on a position spaced apart from the optical axis of the focusing optical system.

[0196] With the configuration of Supplementary Note 5, the first light and the second light are incident at a position away from the optical axis of the light collecting optical system, so that the optical paths of the first light and the second light passing through the light guiding optical system before being incident on the light collecting optical system can be shifted from the optical paths of the first light and the second light passing through the light guiding optical system after being emitted from the light collecting optical system, thereby making it possible to suppress loss of the first light and the second light.

[0197] (Supplementary Note 6) The light source device of Supplementary Note 3, wherein the first optical system has a first optical element including a first region, a second region, a third region, a fourth region, and a fifth region that reflect the third light, the fourth region being located between the first region and the second region and located at the center of the first optical element, the fifth region being located between the second region and the third region, the first light and the second light emitted from the light conversion element passing through the fifth region between the second region and the third region, and the first light and the second light emitted from the second optical system passing through the fourth region.

[0198] In the configuration of Supplementary Note 6, the centers of the third light reflected by the first optical element and the second light reflected by the second optical system can be made to substantially coincide with each other.

[0199] (Supplementary Note 7) The light source device of Supplementary Note 6, wherein the third wavelength band includes the second wavelength band, and a wavelength selective transmission film is disposed in the fourth region and the fifth region, which transmits a portion of light having a wavelength band including the second wavelength band among the light incident on the first optical system and reflects other light.

[0200] In the configuration of Supplementary Note 7, since the wavelength selective transmission film is disposed in the fourth region and the fifth region, it is possible to suppress the loss of color light in the wavelength band that passes through the first optical system.

[0201] (Appendix 8) Any of the light source devices of appendix 2 to appendix 6, wherein the light conversion element includes a reflecting portion that reflects the first light, the substrate is a metal disk, and the reflecting portion and the first light conversion layer are arranged side by side in the circumferential direction of the disk.

[0202] In the configuration of Supplementary Note 8, the amount of the first light extracted from the light conversion element can be easily controlled.

[0203] (Appendix 9) Any of the light source devices according to appendix 3 to appendix 7, wherein the light conversion element further has a second light conversion layer that converts the first light into a fourth light of a fourth wavelength band different from the first wavelength band and the second wavelength band and included in the third wavelength band, and the second light conversion layer is disposed in a different region from the first light conversion layer and the reflecting portion in the circumferential direction of the substrate.

[0204] The configuration of Supplementary Note 9 makes it possible to expand the color gamut of the colored light emitted from the light source device, while preventing the light source device from becoming large.

[0205] (Supplementary Note 10) The light source device of Supplementary Note 9, further comprising a third light source that emits a fifth light of a fifth wavelength band included in the fourth wavelength band, and the light beam reduction optical system matches the optical paths of the fifth light, the first light, and the second light.

[0206] In the configuration of Supplementary Note 10, even when the first light source, the second light source, and the third light source that emit light of any of the three colors are employed, it is possible to prevent the light source device from becoming large.

[0207] (Supplementary Note 11) The light source device of Supplementary Note 10, wherein the light conversion element is disposed on a light incident surface of the second light conversion layer and has a second wavelength selective reflection layer that reflects the fifth light.

[0208] In the configuration of Supplementary Note 11, the fifth light is specularly reflected on the second wavelength selective reflection layer, i.e., on the light incident side, so that the incident light path of the fifth light to the light conversion element and the exit light path from the light conversion element can be made different from each other. Therefore, it is possible to prevent the fifth light reflected from the light conversion element from returning to each light source side from the light guiding optical system.

[0209] (Appendix 12) Any of the light source devices according to appendix 2 to appendix 11, further comprising a third optical system that reflects light including the first light, the second light, and the third light emitted from the light-guiding optical system toward the light conversion element.

[0210] In the configuration of Appendix 12, the third optical system guides color light including the second light and the third light toward the light conversion element, so that the optical path is bent toward the light conversion element by the third optical system, thereby preventing the light source device from becoming large.

[0211] (Appendix 13) The light source device of Appendix 12, wherein the light conversion element has a filter layer provided at a position different from the first light conversion layer in the radial direction of the substrate, and the filter layer transmits only light of a predetermined wavelength band from light including the first light, the second light, and the third light emitted from the third optical system.

[0212] In the configuration of Supplementary Note 13, since an integrated light conversion element performs both the light conversion function and the filter function, it is possible to reduce the number of parts and prevent the light source device from becoming large.

[0213] (Appendix 14) The light source device of Appendix 12, wherein the light conversion element has a diffusion layer provided at a position different from the first light conversion layer in the radial direction of the substrate, and the diffusion layer transmits and diffuses light including the first light, the second light, and the third light emitted from the third optical system.

[0214] In the configuration of Supplementary Note 14, since an integrated light conversion element performs both the light conversion function and the light diffusion function, it is possible to reduce the number of parts and prevent the light source device from becoming large.

[0215] (Appendix 15) Any of the light source devices according to appendix 1 to appendix 14, further comprising a homogenizing optical system disposed between the light beam reduction optical system and the light guiding optical system, which homogenizes the illuminance distribution of the first light and the second light.

[0216] In the configuration of Supplementary Note 15, the light source image of the colored light can be easily adjusted, and color unevenness can be suppressed.

[0217] (Supplementary Note 16) The light source device according to any one of Supplementary Note 1 to Supplementary Note 5, further comprising a rod lens for homogenizing a light intensity distribution in a plane intersecting the optical axis of the light transmitted through the light conversion element.

[0218] In the configuration of Supplementary Note 16, the illuminance distribution of the colored light incident on the rod lens can be made uniform.

[0219] (Supplementary Note 17) The light source device of Supplementary Note 6, wherein a through hole is arranged in the fourth region and the fifth region.

[0220] In the configuration of Supplementary Note 17, the first optical system can be configured simply, and an increase in size of the light source device can be suppressed.

[0221] (Appendix 18) The light source device of Appendix 3, wherein the first optical system has a first reflecting element, a second reflecting element, and a third reflecting element that reflect the third light, the first light and the second light emitted from the light conversion element pass between the first reflecting element and the second reflecting element, and the first light and the second light emitted from the second optical system pass between the second reflecting element and the third reflecting element.

[0222] In the configuration of Supplementary Note 18, the light guiding optical system can be configured simply, and the optical paths of the first light and the second light can be easily aligned with the optical path of the third light.

[0223] (Supplementary Note 19) The light source device of any of Supplementary Notes 12 to 16, wherein the third optical system has a fourth optical system that transmits a portion of the first light, the second light, and the third light reflected from the light-guiding optical system that belongs to the second wavelength band, and reflects the other light to the light conversion element, and a fifth optical system that reflects the optical path of the portion of the light transmitted through the fourth optical system so as to coincide with the optical path of the other light reflected by the fourth optical system.

[0224] In the configuration of Supplementary Note 19, the colored lights are reflected so that the chief ray of the colored lights reflected by the fifth optical system and the chief ray of the colored lights transmitted through the fifth optical system overlap. According to the configuration of Supplementary Note 19, even if the degree of contraction between the luminous fluxes of the colored lights is small and the chief rays of the colored lights do not coincide with each other, the optical axes of the colored lights can be aligned with each other by the fourth optical system and the fifth optical system.

[0225] (Appendix 20) The light source device of Appendix 19, wherein an optical axis of the first light emitted from the first light source and an optical axis of the fifth light emitted from the third light source coincide with each other, and an optical axis of the second light emitted from the second light source is offset from the optical axis of the first light and the optical axis of the fifth light.

[0226] In the configuration of Appendix 20, the light beam reduction optical system is disposed at the front stage of the light source device, and at the rear stage of the first light source and the second light source, and close to the first light source and the second light source, thereby aligning the optical axis of the first light and the optical axis of the second light with each other, reducing the number of parts required to align the optical axes, and preventing the light source device from becoming larger.

[0227] (Supplementary Note 21) A projector comprising: a light source device according to any one of Supplementary Note 1 to Supplementary Note 20; a light modulation device that modulates the light emitted from the light source device in accordance with image information; and a projection optical system that projects the light emitted from the light modulation device.

[0228] In the configuration of Supplementary Note 21, the light source device can be prevented from becoming large, and the projector can be made compact. [Explanation of symbols]

[0229] 10 projector, 11 first light source, 12 second light source, 45 light guide optical system, 50 wavelength conversion device (light conversion element), 110 light source device, 130 light beam reduction optical system.

Claims

1. a first light source that emits a first light in a first wavelength band; a second light source that emits a second light of a second wavelength band different from the first wavelength band in parallel to the first light; a light conversion element that converts the first light incident thereon into a third light of a third wavelength band different from the first wavelength band; a light beam reduction optical system that brings a chief ray of the first light emitted from the first light source and a chief ray of the second light emitted from the second light source closer to each other; a light guiding optical system that guides the first light and the second light emitted from the light beam reduction optical system to the light conversion element; Equipped with the light guiding optical system reflects the first light, the second light, and the third light emitted from the light conversion element; Light source device.

2. The light conversion element is A substrate having a reflective layer; a first light conversion layer disposed on the reflective layer and configured to convert the first light incident thereon into the third light; A first wavelength selective reflection layer is disposed on the light incident surface of the first light conversion layer and reflects the second light. The light source device according to claim 1 .

3. the light guide optical system includes a first optical system and a second optical system, the first optical system reflects the third light emitted from the light conversion element, The second optical system reflects the first light and the second light to an optical path overlapping with the third light reflected by the first optical system. The light source device according to claim 2 .

4. The second optical system is disposed on the opposite side of the first optical system from the light conversion element. The light source device according to claim 3 .

5. a light collecting optical system disposed on an optical path between the light guiding optical system and the light converting element, the light collecting optical system causes the first light and the second light, which have passed through the light guiding optical system, to be incident on the light converting element, and causes light emitted from the light converting element to be incident on the light guiding optical system; The first light and the second light having passed through the light guiding optical system are incident on a position spaced apart from the optical axis of the light collecting optical system. The light source device according to claim 2 .

6. the first optical system has a first optical element including a first region, a second region, a third region, a fourth region, and a fifth region that reflect the third light, the fourth region is located between the first region and the second region and is located at a center of the first optical element, the fifth region is located between the second region and the third region, the first light and the second light emitted from the light conversion element pass through the fifth region, the first light and the second light emitted from the second optical system pass through the fourth area; The light source device according to claim 3.

7. the third wavelength band includes the second wavelength band, A wavelength selective transmission film is disposed in the fourth region and the fifth region, the wavelength selective transmission film transmitting a portion of light having a wavelength band including the second wavelength band among the light incident on the first optical system and reflecting other light. The light source device according to claim 6 .

8. the light conversion element includes a reflecting portion that reflects the first light, the substrate is a metal disk; The reflecting portion and the first light conversion layer are disposed in different regions in the circumferential direction of the substrate. The light source device according to claim 2 , 3 , or 4 .

9. The light conversion element further includes a second light conversion layer that converts the first light into a fourth light of a fourth wavelength band different from the first wavelength band and the second wavelength band and included in the third wavelength band, The second light conversion layer is disposed in a region different from the first light conversion layer and the reflecting portion in the circumferential direction of the substrate. The light source device according to any one of claims 3 to 7.

10. a third light source that emits a fifth light of a fifth wavelength band included in the fourth wavelength band, the light beam reduction optical system causes the optical paths of the fifth light, the first light, and the second light to coincide with each other; The light source device according to claim 9 .

11. The light conversion element is disposed on a light incident surface of the second light conversion layer and has a second wavelength selective reflection layer that reflects the fifth light. The light source device according to claim 10.

12. a third optical system that reflects light including the first light, the second light, and the third light emitted from the light guiding optical system toward the light conversion element, The light source device according to claim 10.

13. The light conversion element has a filter layer provided at a position different from the first light conversion layer in a radial direction of the substrate, the filter layer transmits only light of a predetermined wavelength band among light including the first light, the second light, and the third light emitted from the third optical system. The light source device according to claim 12.

14. The light conversion element has a diffusion layer provided at a position different from the first light conversion layer in a radial direction of the substrate, the diffusion layer transmits and diffuses light including the first light, the second light, and the third light emitted from the third optical system. The light source device according to claim 12.

15. a homogenizing optical system disposed between the light beam reduction optical system and the light guiding optical system, for homogenizing an illuminance distribution of the first light and the second light, The light source device according to claim 1 .

16. The light source further includes a rod lens for homogenizing a light intensity distribution in a plane intersecting the optical axis of the light transmitted through the light conversion element.

15. The light source device according to claim 13 or 14.

17. A through hole is arranged in the fourth region and the fifth region. The light source device according to claim 6 .

18. the first optical system includes a first reflecting element, a second reflecting element, and a third reflecting element that reflect the third light, the first light and the second light emitted from the light conversion element pass between the second reflecting element and the third reflecting element, the first light and the second light emitted from the second optical system pass between the first reflecting element and the second reflecting element; The light source device according to claim 3 .

19. The third optical system is a fourth optical system that transmits a portion of the light reflected from the light guiding optical system that belongs to the second wavelength band and reflects the remaining light to the light conversion element; a fifth optical system that reflects the optical path of the part of the light that has passed through the fourth optical system so as to coincide with the optical path of the other light that has been reflected by the fourth optical system; The light source device according to claim 12.

20. an optical axis of the first light emitted from the first light source and an optical axis of the fifth light emitted from the third light source are aligned with each other; an optical axis of the second light emitted from the second light source is deviated from an optical axis of the first light and an optical axis of the fifth light; 20. The light source device according to claim 19.

21. A light source device according to any one of claims 1 to 4, a light modulation device that modulates the light emitted from the light source device in accordance with image information; a projection optical system that projects the light emitted from the light modulation device; Equipped with projector.

Images