Light source device and projector

Abstract

Provided are a light source device and a projector with high utilization efficiency of excitation light. The light source device has a light emitting element that emits first light, a wavelength conversion member that converts the first light into second light, and a support member. The wavelength conversion member has a first face and a second face that cross a length direction of the wavelength conversion member, a third face and a fourth face that cross the first face and the second face, a fifth face and a sixth face that cross the first face and the second face and cross the third face and the fourth face, and the second light is emitted from the first face. A light emitting face of the light emitting element opposes the third face. The support member has a support face that opposes the fourth face and a first wall face that opposes the fifth face and is separated. The first wall face has a first portion on the wavelength conversion member side and a second portion on the support face side, the first portion extends in a direction perpendicular to the support face, the second portion is inclined in such a way as to move away from the fifth face as it moves from the support face toward the first portion, and the second portion reflects at least a portion of the first light.

Description

TECHNICAL FIELD

[0001] The present application relates to a light source device and a projector. BACKGROUND

[0002] As a light source device used in a projector, a light source device that utilizes fluorescent light emitted from a fluorescent body when excitation light emitted from a light emitting element is irradiated to the fluorescent body has been proposed.

[0003] A light source device disclosed in the following Patent Literature 1 has an excitation light source that emits excitation light, a rod-shaped fluorescent body that converts the excitation light into fluorescent light, and a heat conducting member that releases heat generated by the fluorescent body. The heat conducting member is provided so as to cover the periphery of the fluorescent body.

[0004] Patent Literature 1: International Publication No. 2020 / 254455

[0005] However, in the above-described light source device, sometimes a part of the excitation light emitted from the excitation light source is incident to the heat conducting member and cannot sufficiently be incident to the fluorescent body. In this case, the utilization efficiency of the excitation light is low, and it can be impossible to obtain fluorescent light having a desired intensity. SUMMARY

[0006] To solve the above-described problem, a light source device of one embodiment of the present application has a light emitting element that has a light emitting surface from which first light having a first wavelength band is emitted, a wavelength conversion member that includes a fluorescent body and converts the first light emitted from the light emitting element into second light having a second wavelength band different from the first wavelength band, and a support member that supports the wavelength conversion member, the wavelength conversion member has a first surface and a second surface that cross a length direction of the wavelength conversion member and are located on opposite sides of each other, a third surface and a fourth surface that cross the first surface and the second surface and are located on opposite sides of each other, and a fifth surface and a sixth surface that cross the first surface and the second surface and cross the third surface and the fourth surface and are located on opposite sides of each other, the second light is emitted from the first surface, the light emitting surface is provided so as to face the third surface, the support member has a support surface that faces the fourth surface and a first wall surface that faces the fifth surface and is separated from the fifth surface, the first wall surface has a first portion on the wavelength conversion member side and a second portion on the support surface side, the first portion extends in a direction perpendicular to the support surface, the second portion is inclined so as to be away from the fifth surface as it goes from the support surface toward the first portion, and the second portion reflects at least a part of the first light.

[0007] A projector according to one embodiment of the present invention comprises: a light source device according to one embodiment of the present invention; a light modulator that modulates light including the second light from the light source device according to image information; and a projection optical device that projects the light modulated by the light modulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic configuration diagram of the projector according to the first embodiment.

[0009] Figure 2 This is a schematic structural diagram of a first lighting device according to a first embodiment.

[0010] Figure 3 It is along Figure 2 Cross-sectional view of the III-III line light source device.

[0011] Figure 4 It is a cross-sectional view of a light source device of a comparative example.

[0012] Figure 5 It is a cross-sectional view of a light source device according to a second embodiment.

[0013] Figure 6 It is a cross-sectional view of a light source device according to a third embodiment.

[0014] Figure 7 It is a cross-sectional view of a light source device according to a fourth embodiment.

[0015] Figure 8 It is a cross-sectional view of a light source device according to a fifth embodiment.

[0016] Label Description

[0017] 1: projector; 4B, 4G, 4R: light modulating device; 6: projection optical device; 50: wavelength conversion member; 50a: 1st surface; 50b: 2nd surface; 50c: 3rd surface; 50d: 4th surface; 50e: 5th surface; 50f: 6th surface; 52: angle conversion member; 54, 64, 74, 84, 94: support member; 54a, 64a, 74a, 84a, 94a: 1st wall surface; 54a1, 64a1, 74a1, 84a1, 94a1: 1st portion; 54a2, 64a2, 74a2, 84a2, 94a2: 2nd portion; 54b, 64b, 74b, 84b, 94b: 2nd wall surface; 54b3, 64b3, 74b3, 84b3: 3rd portion; 54b4, 64b4, 74b4, 84b4: 4th portion; 54s, 64s, 74s, 84s, 94s: support surface; 56: light emitting element; 56a: light emitting surface; 100, 110, 120, 130, 140: light source device; 640: base material; 641: 1st reflecting member; 642: 2nd reflecting member; E, E1, E2: excitation light (1st light); Y: fluorescent light. DETAILED DESCRIPTION

[0018] (1st embodiment)

[0019] Hereinafter, the use of Figures 1-5 The 1st embodiment of the present application will be described.

[0020] The projector of the present embodiment is an example of a projector using a liquid crystal panel as a light modulating device.

[0021] In the following respective drawings, in order to easily observe respective constituent elements, the scale of the size is sometimes represented differently according to the constituent elements.

[0022] Figure 1 is a diagram showing the schematic structure of the projector 1 of the present embodiment.

[0023] As Figure 1 shown, the projector 1 of the present embodiment is a projection type image display device that displays a color image on a screen (projected surface) SCR. The projector 1 has three light modulating devices corresponding to respective colors of red light LR, green light LG, and blue light LB.

[0024] The projector 1 has a 1st illumination device 20, a 2nd illumination device 21, a color separation optical system 3, a light modulating device 4R, a light modulating device 4G, a light modulating device 4B, a light synthesizing element 5, and a projection optical device 6.

[0025] The first illumination device 20 emits yellow fluorescent light Y toward the color separation optical system 3. The second illumination device 21 emits blue light LB toward the light modulation device 4B. The detailed structures of the first illumination device 20 and the second illumination device 21 will be described later.

[0026] Hereinafter, in the drawings, XYZ orthogonal coordinate system will be used for explanation as necessary. The Z axis is an axis in the up-down direction of the projector 1. The X axis is an axis parallel to the optical axis AX1 of the first illumination device 20 and the optical axis AX2 of the second illumination device 21. The Y axis is an axis orthogonal to the X axis and the Z axis. The optical axis AX1 of the first illumination device 20 is a central axis of the fluorescent light Y emitted from the first illumination device 20. The optical axis AX2 of the second illumination device 21 is a central axis of the blue light LB emitted from the second illumination device 21.

[0027] The color separation optical system 3 separates the yellow fluorescent light Y emitted from the first illumination device 20 into red light LR and green light LG. The color separation optical system 3 has a dichroic mirror 7, a first mirror 8a, and a second mirror 8b.

[0028] The dichroic mirror 7 separates the fluorescent light Y into red light LR and green light LG. The dichroic mirror 7 transmits the red light LR and reflects the green light LG. The second mirror 8b is disposed in the optical path of the green light LG. The second mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the light modulation device 4G. The first mirror 8a is disposed in the optical path of the red light LR. The first mirror 8a reflects the red light LR transmitted through the dichroic mirror 7 toward the light modulation device 4R.

[0029] On the other hand, the blue light LB emitted from the second illumination device 21 is reflected by the mirror 9 toward the light modulation device 4B.

[0030] Hereinafter, the structure of the second illumination device 21 will be described.

[0031] The second illumination device 21 has a light source section 81, a condenser lens 82, and a diffusion plate 83, a rod lens 86, and a relay lens 87. The light source section 81 is constituted by at least one semiconductor laser. The light source section 81 emits blue light LB constituted by laser light. Note that the light source section 81 is not limited to a semiconductor laser, but can be constituted by an LED that emits blue light.

[0032] The condenser lens 82 is constituted by a convex lens. The condenser lens 82 causes the blue light LB emitted from the light source section 81 to be incident on the diffusion plate 83 in a substantially condensed state. The diffusion plate 83 diffuses the blue light LB emitted from the condenser lens 82 at a prescribed diffusion degree, and generates blue light LB having a substantially uniform distribution of luminous intensity distribution as with the fluorescent light Y emitted from the first illumination device 20. As the diffusion plate 83, for example, ground glass constituted by optical glass is used.

[0033] The blue light LB diffused by the diffusion plate 83 is incident to the rod lens 86. The rod lens 86 has a prismatic shape extending in the direction of the optical axis AX2 of the second illumination device 21. The rod lens 86 has a light incident end face 86a provided at one end and a light exit end face 86b provided at the other end. The diffusion plate 83 is fixed to the light incident end face 86a of the rod lens 86 via an optical adhesive (omitted from the drawing). It is preferable that the refractive index of the diffusion plate 83 and the refractive index of the rod lens 86 be as consistent as possible.

[0034] The blue light LB propagates inside the rod lens 86 while being totally reflected, and is emitted from the light exit end face 86b in a state in which the uniformity of the illuminance distribution is improved. The blue light LB emitted from the rod lens 86 is incident to the relay lens 87. The relay lens 87 causes the blue light LB whose uniformity of the illuminance distribution has been improved by the rod lens 86 to be incident to the mirror 9.

[0035] The shape of the light exit end face 86b of the rod lens 86 is a rectangular shape that is approximately similar to the shape of the image formation region of the light modulating device 4B. Thus, the blue light LB emitted from the rod lens 86 is efficiently incident to the image formation region of the light modulating device 4B.

[0036] The light modulating device 4R modulates the red light LR in accordance with image information, and forms image light corresponding to the red light LR. The light modulating device 4G modulates the green light LG in accordance with image information, and forms image light corresponding to the green light LG. The light modulating device 4B modulates the blue light LB in accordance with image information, and forms image light corresponding to the blue light LB.

[0037] The light modulating device 4R, the light modulating device 4G, and the light modulating device 4B each use, for example, a transmissive liquid crystal panel. In addition, a polarizing plate (omitted from the drawing) is disposed on the incident side and the exit side of the liquid crystal panel, respectively. The polarizing plate passes only linearly polarized light of a specific direction.

[0038] A field lens 10R is disposed on the incident side of the light modulating device 4R. A field lens 10G is disposed on the incident side of the light modulating device 4G. A field lens 10B is disposed on the incident side of the light modulating device 4B. The field lens 10R parallelizes chief rays of the red light LR incident to the light modulating device 4R. The field lens 10G parallelizes chief rays of the green light LG incident to the light modulating device 4G. The field lens 10B parallelizes chief rays of the blue light LB incident to the light modulating device 4B.

[0039] The light synthesizing element 5 synthesizes the image light corresponding to the red light LR, the green light LG, and the blue light LB by the incidence of the image light emitted from the light modulating device 4R, the light modulating device 4G, and the light modulating device 4B, and emits the synthesized image light toward the projection optical device 6. The light synthesizing element 5 uses, for example, a cross dichroic prism.

[0040] The projection optical device 6 is constituted by a plurality of projection lenses. The projection optical device 6 enlargingly projects the image light synthesized by the light synthesizing element 5 toward the screen SCR. Thereby, an image is displayed on the screen SCR.

[0041] Hereinafter, the structure of the first illumination device 20 will be described.

[0042] Figure 2 is a schematic configuration view of the first illumination device 20.

[0043] As shown in Figure 2 , the first illumination device 20 has a light source device 100, an integrator optical system 70, a polarization conversion element 102, and an overlapping optical system 103.

[0044] The light source device 100 has a wavelength conversion member 50, a light source section 51, an angle conversion member 52, a mirror 53, and a support member 54. The light source section 51 is provided with a substrate 55 and a light emitting element 56.

[0045] The wavelength conversion member 50 has a quadrangular prism shape extending in the X-axis direction, and has six faces. The edge of the wavelength conversion member 50 extending in the X-axis direction is longer than the edge extending in the Y-axis direction and the edge extending in the Z-axis direction. Therefore, the X-axis direction corresponds to the longitudinal direction of the wavelength conversion member 50. The length of the edge extending in the Y-axis direction is equal to the length of the edge extending in the Z-axis direction. That is, the cross-sectional shape of the wavelength conversion member 50 after being cut with a face perpendicular to the X-axis direction is a square. Alternatively, the cross-sectional shape of the wavelength conversion member 50 after being cut with a face perpendicular to the X-axis direction can be a rectangle.

[0046] The wavelength conversion member 50 has a first face 50a and a second face 50b intersecting the longitudinal direction (X-axis direction) of the wavelength conversion member 50 and located on opposite sides of each other, a third face 50c and a fourth face 50d intersecting the first face 50a and the second face 50b and located on opposite sides of each other, and a fifth face 50e and a sixth face 50f intersecting the third face 50c and the fourth face 50d and located on opposite sides of each other. In the following description, the third face 50c, the fourth face 50d, the fifth face 50e, and the sixth face 50f will be referred to as side faces.

[0047] The wavelength conversion member 50 contains at least a phosphor, and converts the excitation light E having the first wavelength band into fluorescent light Y having a second wavelength band different from the first wavelength band. The excitation light E is incident on the wavelength conversion member 50 from a third surface 50c. The fluorescent light Y is emitted from a first surface 50a after propagating inside the wavelength conversion member 50. The excitation light E of the present embodiment corresponds to the first light of the technical solution. The fluorescent light Y of the present embodiment corresponds to the second light of the technical solution.

[0048] The wavelength conversion member 50 contains a ceramic phosphor composed of a polycrystalline phosphor that wavelength-converts the excitation light E into the fluorescent light Y. The second wavelength band possessed by the fluorescent light Y is, for example, a yellow wavelength band of 490 nm to 750 nm. That is, the fluorescent light Y is yellow fluorescent light containing a red light component and a green light component.

[0049] The wavelength conversion member 50 can also contain a single-crystal phosphor instead of the polycrystalline phosphor. Alternatively, the wavelength conversion member 50 can also be composed of a phosphor glass. Alternatively, the wavelength conversion member 50 can also be composed of a material in which a plurality of phosphor particles are dispersed in a binder composed of glass or resin. The wavelength conversion member 50 composed of such a material converts the excitation light E into the fluorescent light Y having the second wavelength band.

[0050] Specifically, the material of the wavelength conversion member 50 contains, for example, a yttrium aluminum garnet (YAG)-based phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, as the material of the wavelength conversion member 50, a material obtained by mixing raw material powders containing constituent elements such as Y2O3, Al2O3, and CeO3 and performing solid-phase reaction, Y-Al-O amorphous particles obtained by a wet method such as a coprecipitation method, a sol-gel method, or the like, YAG particles obtained by a gas-phase method such as a spray drying method, a flame thermal decomposition method, a thermal plasma method, or the like, and the like are used.

[0051] The light source section 51 is provided with a light-emitting element 56 having a light-emitting surface 56a that emits the excitation light E having the first wavelength band. The light-emitting element 56 is composed of, for example, a light-emitting diode (LED). The light-emitting surface 56a of the light-emitting element 56 faces the third surface 50c of the wavelength conversion member 50, and emits the excitation light E toward the third surface 50c. The first wavelength band is, for example, a blue to violet wavelength band of 400 nm to 480 nm, and the peak wavelength is, for example, 445 nm. In this way, the light source section 51 is disposed so as to face one of the four side surfaces along the longitudinal direction of the wavelength conversion member 50, that is, the third surface 50c.

[0052] The substrate 55 supports the light-emitting element 56. A plurality of light-emitting elements 56 are provided on one surface 55a of the substrate 55. In the case of the present embodiment, the light source section 51 is composed of the light-emitting element 56 and the substrate 55, but in addition thereto, other optical members such as a light guide plate, a diffusion plate, a lens, or the like can be provided. Furthermore, the number of light-emitting elements 56 is not particularly limited.

[0053] The support member 54 is provided so as to surround the circumference of the wavelength conversion member 50. The support member 54 supports the wavelength conversion member 50 and diffuses heat generated by the wavelength conversion member 50 to the outside. Therefore, the support member 54 is preferably composed of a material having a prescribed strength and a high thermal conductivity. As the material of the support member 54, for example, a metal such as aluminum, stainless steel, or the like is used, and particularly preferably an aluminum alloy such as a 6061 series is used. The specific shape of the support member 54 will be described later.

[0054] The reflector 53 is provided to the second face 50b of the wavelength conversion member 50. The reflector 53 reflects the fluorescent light Y that has conducted inside the wavelength conversion member 50 to reach the second face 50b. The reflector 53 is composed of a metal film or a dielectric multilayer film formed to the second face 50b of the wavelength conversion member 50.

[0055] In the first illumination device 20, when the excitation light E emitted from the light source section 51 is incident to the wavelength conversion member 50, the phosphor included inside the wavelength conversion member 50 is excited, and the fluorescent light Y is emitted from an arbitrary emission point. The fluorescent light Y advances from the arbitrary emission point toward all directions, but the fluorescent light Y toward the four side faces 50c, 50d, 50e, 50f repeatedly performs total reflection at a plurality of portions of the side faces 50c, 50d, 50e, 50f, and advances toward the first face 50a or the second face 50b. The fluorescent light Y that advances toward the first face 50a is incident to the angle conversion member 52. The fluorescent light Y that advances toward the second face 50b is reflected by the reflector 53 and advances toward the first face 50a.

[0056] A portion of the excitation light E included in the excitation light E that is incident to the wavelength conversion member 50 and that is not used for excitation of the phosphor is reflected by a member that surrounds the wavelength conversion member 50 including the light emitting element 56 of the light source section 51, or the reflector 53 provided to the second face 50b. Therefore, a portion of the excitation light E is enclosed inside the wavelength conversion member 50 and is reused.

[0057] The angle conversion member 52 is provided to the light emission side of the first face 50a of the wavelength conversion member 50. The angle conversion member 52 is composed of, for example, a tapered rod. The angle conversion member 52 has a light incident face 52a that is caused to be incident with the fluorescent light Y emitted from the wavelength conversion member 50, a light emission face 52b that emits the fluorescent light Y, and a side face 52c that reflects the fluorescent light Y toward the light emission face 52b.

[0058] The angle conversion member 52 has a shape of a quadrangular frustum, and the cross-sectional area perpendicular to the optical axis J expands along the direction of travel of light. Therefore, the area of the light exit surface 52b is larger than the area of the light entrance surface 52a. An axis that passes through the center of the light exit surface 52b and the light entrance surface 52a and is parallel to the X axis is set as the optical axis J of the angle conversion member 52. Further, the optical axis J of the angle conversion member 52 coincides with the optical axis AX1 of the first illuminating device 20.

[0059] The fluorescent light Y incident on the angle conversion member 52 is changed in orientation to approach a direction parallel to the optical axis J each time it is totally reflected at the side surface 52c during travel inside the angle conversion member 52. In this way, the angle conversion member 52 converts the distribution of the exit angle of the fluorescent light Y emitted from the first surface 50a of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum exit angle of the fluorescent light Y on the light exit surface 52b smaller than the maximum entrance angle of the fluorescent light Y on the light entrance surface 52a.

[0060] Generally, since the etendue of light, which is defined by the product of the area of the light exit region and the solid angle (maximum exit angle) of light, is conserved, the etendue of the fluorescent light Y is also conserved before and after passing through the angle conversion member 52. As described above, the angle conversion member 52 of the present embodiment has a structure in which the area of the light exit surface 52b is larger than the area of the light entrance surface 52a. Therefore, from the viewpoint of conservation of optical etendue, the angle conversion member 52 of the present embodiment can make the maximum exit angle of the fluorescent light Y in the light exit surface 52b an angle smaller than the maximum entrance angle of the fluorescent light Y incident on the light entrance surface 52a.

[0061] The angle conversion member 52 is fixed to the wavelength conversion member 50 via an optical adhesive (not shown) in a manner such that the light entrance surface 52a opposes the first surface 50a of the wavelength conversion member 50. That is, the angle conversion member 52 and the wavelength conversion member 50 are in contact via the optical adhesive, and no gap (air layer) is provided between the angle conversion member 52 and the wavelength conversion member 50. In the case where a gap is provided between the angle conversion member 52 and the wavelength conversion member 50, the fluorescent light Y incident on the light entrance surface 52a of the angle conversion member 52 at an angle of equal to or greater than the critical angle is totally reflected at the light entrance surface 52a and cannot be incident on the angle conversion member 52. In contrast, in the case where no gap is provided between the angle conversion member 52 and the wavelength conversion member 50 as in the present embodiment, it is possible to reduce the fluorescent light Y that cannot be incident on the angle conversion member 52. From this viewpoint, it is preferable to make the refractive index of the angle conversion member 52 as uniform as possible with the refractive index of the wavelength conversion member 50.

[0062] As the angle conversion member 52, a Compound Parabolic Concentrator (CPC) can also be used instead of the tapered rod. Even in the case where the CPC is used as the angle conversion member 52, the same effects as in the case where the tapered rod is used can be obtained. Further, the light source device 100 can not necessarily be provided with the angle conversion member 52.

[0063] The integrator optical system 70 has the first lens array 61 and a second lens array 101. The integrator optical system 70, together with an overlapping optical system 103, constitutes a uniform illumination optical system that homogenizes the intensity distribution of the fluorescent light Y emitted from the light source device 100 in each of the light modulation devices 4R, 4G as the illuminated region. The fluorescent light Y emitted from the light emission surface 52b of the angle conversion member 52 is incident on the first lens array 61. The first lens array 61, together with the second lens array 101 disposed at the rear stage of the light source device 100, constitutes the integrator optical system 70.

[0064] The first lens array 61 has a plurality of first lenslets 61a. The plurality of first lenslets 61a are arranged in a matrix shape in a plane parallel to a YZ plane orthogonal to the optical axis AX1 of the first illumination device 20. The plurality of first lenslets 61a divide the fluorescent light Y emitted from the angle conversion member 52 into a plurality of partial light beams. The shape of each of the first lenslets 61a is a rectangular shape that is approximately similar to the shape of the image formation region of the light modulation device 4R, 4G. Thereby, the partial light beams emitted from the first lens array 61 are efficiently incident on the image formation regions of the light modulation devices 4R, 4G, respectively.

[0065] The fluorescent light Y emitted from the first lens array 61 advances toward the second lens array 101. The second lens array 101 is disposed opposite to the first lens array 61. The second lens array 101 has a plurality of second lenslets 101a corresponding to the plurality of first lenslets 61a of the first lens array 61. The second lens array 101, together with the overlapping optical system 103, causes the images of the plurality of first lenslets 61a of the first lens array 61 to be imaged near the image formation regions of the light modulation devices 4R, 4G, respectively. The plurality of second lenslets 101a are arranged in a matrix shape in a plane parallel to a YZ plane orthogonal to the optical axis AX1 of the first illumination device 20.

[0066] In the present embodiment, each of the first lenslets 61a of the first lens array 61 and each of the second lenslets 101a of the second lens array 101 has the same size as each other, but can have different sizes from each other. Further, in the present embodiment, the first lenslets 61a of the first lens array 61 and the second lenslets 101a of the second lens array 101 are disposed at positions where the optical axes thereof coincide with each other, but can be disposed in a state where they are decentered from each other.

[0067] The polarization conversion element 102 converts the polarization direction of the fluorescence Y emitted from the second lens array 101. Specifically, the polarization conversion element 102 converts each partial beam of the fluorescence Y emitted from the second lens array 101 after being split by the first lens array 61 into linearly polarized light.

[0068] The polarization conversion element 102 includes: a polarization separation layer (not shown), which allows the linear polarization component of one side of the polarization components contained in the fluorescence Y emitted from the light source device 100 to pass directly, and reflects the other linear polarization component in a direction perpendicular to the optical axis AX1; a reflective layer (not shown), which reflects the other linear polarization component after being reflected by the polarization separation layer in a direction parallel to the optical axis AX1; and a phase difference plate (not shown), which converts the other linear polarization component after being reflected by the reflective layer into a linear polarization component of one side.

[0069] Hereinafter, the cross-sectional structure of the light source device 100 will be described.

[0070] Figure 3 It is along Figure 2 1 is a cross-sectional view of the light source device 100 taken along line III-III.

[0071] like Figure 3 As shown, the support member 54 has a recessed portion 54h for accommodating the wavelength conversion member 50, and has a generally U-shaped cross-section. The support member 54 includes a support surface 54s, a first wall surface 54a, and a second wall surface 54b. The support surface 54s corresponds to the bottom surface of the recessed portion 54h and faces the fourth surface 50d of the wavelength conversion member 50. In this embodiment, the support surface 54s extends parallel to the XZ plane.

[0072] The wavelength conversion member 50 is fixed to the support member 54 by fixing members (not shown) such as leaf springs provided at multiple locations on the third surface 50c. With this structure, the wavelength conversion member 50 is securely in close contact with the support surface 54s, and thus the heat generated by the wavelength conversion member 50 is sufficiently transferred to the support member 54.

[0073] The first wall surface 54a corresponds to one side surface of the recess 54h, faces the fifth surface 50e of the wavelength conversion member 50, and is spaced apart from the fifth surface 50e. The second wall surface 54b corresponds to the other side surface of the recess 54h, faces the sixth surface 50f of the wavelength conversion member 50, and is spaced apart from the sixth surface 50f. Specifically, a gap S1 is provided between the first wall surface 54a and the fifth surface 50e of the wavelength conversion member 50. A gap S1 is provided between the second wall surface 54b and the sixth surface 50f of the wavelength conversion member 50.

[0074] The first wall surface 54a has a first portion 54al on a side farther from the support surface 54s and a second portion 54a2 on a side closer to the support surface 54s. The first portion 54al extends in parallel with respect to a direction perpendicular to the support surface 54s, that is, the XY plane. The second portion 54a2 extends in a direction inclined with respect to the support surface 54s. The second portion 54a2 is inclined toward the fifth surface 50e of the wavelength conversion member 50 as it approaches from the side farther from the support surface 54s toward the side closer to the support surface 54s. In other words, the distance between the second portion 54a2 on the side closer to the support surface 54s and the fifth surface 50e is smaller than the distance between the second portion 54a2 on the side closer to the first portion 54al and the fifth surface 50e. Here, the distance between the second portion 54a2 on the side closer to the support surface 54s and the fifth surface 50e indicates the shortest length connecting a portion of the second portion 54a2 on the side closer to the support surface 54s and the fifth surface 50e. The distance between the second portion 54a2 on the side closer to the first portion 54al and the fifth surface 50e indicates the shortest length connecting a portion of the second portion 54a2 on the side closer to the first portion 54al and the fifth surface 50e. In the case of the present embodiment, the second portion 54a2 is constituted by a flat surface. That is, the first wall surface 54a has the first portion 54al on the side of the wavelength conversion member 50 and the second portion 54a2 on the side of the support surface 54s, the first portion 54al extends in a direction perpendicular to the support surface 54s, the second portion 54a2 is inclined so as to be farther from the fifth surface 50e as it approaches from the support surface 54s toward the first portion 54al, and the second portion 54a2 reflects at least a portion of the excitation light E.

[0075] The second wall surface 54b has the same structure as the first wall surface 54a. That is, the second wall surface 54b has a third portion 54b3 on a side relatively far from the support surface 54s and a fourth portion 54b4 on a side relatively close to the support surface 54s. The third portion 54b3 extends in parallel with respect to a direction perpendicular to the support surface 54s, that is, the XY plane. The fourth portion 54b4 extends in a direction inclined with respect to the support surface 54s. The fourth portion 54b4 is inclined toward the sixth surface 50f of the wavelength conversion member 50 as it approaches from the side far from the support surface 54s toward the side close to the support surface. In other words, the distance between the fourth portion 54b4 on the side close to the support surface 54s and the sixth surface 50f is smaller than the distance between the fourth portion 54b4 on the side close to the third portion 54b3 and the sixth surface 50f. In the case of the present embodiment, the fourth portion 54b4 is constituted by a flat surface. That is, the second wall surface 54b has the third portion 54b3 on the side of the wavelength conversion member 50 and the fourth portion 54b4 on the side of the support surface 54s, the third portion 54b3 extends in a direction perpendicular to the support surface 54s, the fourth portion 54b4 is inclined so as to be farther from the sixth surface 50f as it approaches from the support surface 54s toward the third portion 54b3, and the fourth portion 54b4 reflects at least a portion of the excitation light E.

[0076] In the case of the present embodiment, the first wall surface 54a and the second wall surface 54b are each constituted by a surface of a metal such as aluminum or stainless steel as a constituent material of the support member 54. More specifically, the first wall surface 54a and the second wall surface 54b are each constituted by a processed surface in which the surface of the above metal is mirror finished. Thus, the first wall surface 54a and the second wall surface 54b each have a light reflecting property and reflect the incident excitation light E well. Alternatively, the first wall surface 54a and the second wall surface 54b can each be constituted by another metal film or a dielectric multilayer film formed on the surface of the metal such as aluminum or stainless steel. At least the second portion 54a2 and the fourth portion 54b4 of the first wall surface 54a and the second wall surface 54b need to reflect at least a portion of the excitation light E.

[0077] In this embodiment, the dimension W1 of the light emitting surface 56a of the light emitting element 56 along the Z-axis direction is larger than the dimension W2 of the wavelength conversion member 50 along the Z-axis direction. Thus, in the Z-axis direction, both end portions of the light emitting surface 56a of the light emitting element 56 protrude to the outside of the third surface 50c of the wavelength conversion member 50. Specifically, both end portions of the light emitting surface 56a of the light emitting element 56 protrude to a position overlapping the gap S1 between the fifth surface 50e and the first wall surface 54a and the gap S1 between the sixth surface 50f and the second wall surface 54b. In other words, when the light emitting surface 56a is viewed from the support surface 54s along the Y-axis direction, a portion of the light emitting surface 56a overlaps the third surface 50c, and another portion of the light emitting surface 56a overlaps the gap S1 between the fifth surface 50e and the first wall surface 54a and the gap S1 between the sixth surface 50f and the second wall surface 54b.

[0078] Further, when a position at which the excitation light E1 that has exited from the end portion of the light emitting surface 56a on the -Z side and passed through the +Z-side corner portion of the third surface 50c of the wavelength conversion member 50 to travel toward the first wall surface 54a is incident on the first wall surface 54a is set as P1, the distance from the end portion of the first wall surface 54a on the -Y side to the position P1 is set as T1. At this time, it is preferable that the dimension T2 of the first portion 54a1 along the Y-axis direction be at least larger than the distance T1.

[0079] In the case of this embodiment, the dimension W3 of the support surface 54s of the support member 54 along the Z-axis direction is larger than the dimension W2 of the wavelength conversion member 50 along the Z-axis direction. Thus, in the Z-axis direction, both end portions of the support surface 54s protrude to the outside of the fourth surface 50d of the wavelength conversion member 50. In other words, when the support surface 54s is viewed from the light emitting surface 56a along the Y-axis direction, a portion of the support surface 54s overlaps the fourth surface 50d, and another portion of the support surface 54s is exposed to the outside of the fourth surface 50d. In this way, in this embodiment, the support surface 54s has an exposed portion 54r that is exposed to the outside of the wavelength conversion member 50.

[0080] (Comparative Example)

[0081] Here, the light source device of the comparative example will be described.

[0082] Figure 4 is a cross-sectional view of the light source device 200 of the comparative example.

[0083] As Figure 4 indicated, the light source device 200 of the comparative example has a light emitting element 56, a wavelength conversion member 50, and a support member 254. The structure of the support member 254 of the light source device 200 of the comparative example is different from that of the light source device 100 of this embodiment. Thus, in Figure 4 , the light emitting element 56 and the wavelength conversion member 50 are labeled as in Figure 3The same reference numerals are used, and the description is omitted.

[0084] In the light source device 200 of the comparative example, the support member 254 has the support surface 254s, the first wall surface 254a, and the second wall surface 254b. The first wall surface 254a extends in a direction perpendicular to the support surface 254s, and does not have the second portion 54a2 that is inclined as in the present embodiment. Similarly, the second wall surface 254b extends in a direction perpendicular to the support surface 254s, and does not have the fourth portion 54b4 that is inclined as in the present embodiment.

[0085] In such a light source device, the width of the recess of the support member for accommodating the wavelength conversion member is generally made larger than the width of the wavelength conversion member in consideration of manufacturing variations. As a result, a gap is formed between the first wall surface and the fifth surface, and between the second wall surface and the sixth surface, in a state where the components are assembled.

[0086] In addition, in order to increase the amount of excitation light that is incident on the wavelength conversion member from the light emitting element, a light emitting element having a width that is larger than the width of the wavelength conversion member is sometimes used. In this case, a portion of the light emitting surface of the light emitting element is positioned so as to be exposed from the gap between the first wall surface and the fifth surface, and the gap between the second wall surface and the sixth surface, on the outside of the wavelength conversion member.

[0087] As a result, in the light source device 200 of the comparative example, excitation light E2 that is emitted from a portion of the light emitting surface 56a sometimes enters the support surface 254s through the gap S1, is reflected by the support surface 254s, and then returns to the light source portion 51 side through the gap S1 again. Such excitation light E2 does not enter the wavelength conversion member 50, and therefore does not contribute to the excitation of the phosphor. In this case, even if the amount of excitation light from the light emitting element 56 is increased, the utilization efficiency of the excitation light is low, and it can be difficult to obtain phosphor light having a desired intensity.

[0088] (EFFECTS OF THE FIRST EMBODIMENT)

[0089] The light source device 100 of this embodiment includes: a light emitting element 56 having a light emitting surface 56a, which emits excitation light E having a first wavelength band from the light emitting surface 56a; a wavelength conversion member (50) containing a phosphor, which converts the excitation light E emitted from the light emitting element 56 into fluorescence light Y having a second wavelength band different from the first wavelength band; and a support member 54 that supports the wavelength conversion member 50. The wavelength conversion member 50 includes: a first surface 50a and a second surface 50b, which intersect the longitudinal direction of the wavelength conversion member 50 and are located on opposite sides of each other; a third surface 50c and a fourth surface 50d, which intersect the first surface 50a and the second surface 50b and are located on opposite sides of each other; and a fifth surface 50e and a sixth surface 50f, which intersect the third surface 50c and the fourth surface 50d and are located on opposite sides of each other. Fluorescence light Y is emitted from the first surface 50a. The light emitting surface 56a is arranged to face the third surface 50c. The support member 54 includes a support surface 54s facing the fourth surface 50d, and a first wall surface 54a facing and spaced apart from the fifth surface 50e. The first wall surface 54a includes a first portion 54a1 located relatively farther from the support surface 54s and extending perpendicularly to the support surface 54s, and a second portion 54a2 located relatively closer to the support surface 54s and extending obliquely relative to the support surface 54s. The second portion 54a2 reflects at least a portion of the excitation light E. The distance between the second part 54a2 on the side relatively close to the supporting surface 54s and the fifth surface 50e is smaller than the distance between the second part 54a2 on the side relatively close to the first part 54a1 and the fifth surface 50e. When observing the light-emitting surface 56a from the supporting surface 54s, a part of the light-emitting surface 56a overlaps with the third surface 50c, and another part of the light-emitting surface 56a overlaps with the gap S1 between the fifth surface 50e and the first wall surface 54a.

[0090] According to the light source device 100 of this embodiment, Figure 3 As shown, a portion of the excitation light E2 emitted from the light-emitting surface 56a of the light-emitting element 56 passes through the gap S1 between the fifth surface 50e of the wavelength conversion member 50 and the first portion 54a1, then enters the second portion 54a2, which is inclined relative to the support surface 54s. At this point, the excitation light E2 is reflected by the second portion 54a2 and enters the fifth surface 50e of the wavelength conversion member 50. This reduces the amount of excitation light that is reflected from the support surface and returned to the light source unit, as in the light source device 200 of the comparative example.

[0091] Further, in the present embodiment, the amount of excitation light E that is reflected by the inclined first wall surface and returns to the light source portion side can be reduced. Further, in the present embodiment, by using a larger light emitting element 56 with respect to the wavelength conversion member 50, the amount of excitation light E can be sufficiently ensured. Thus, the intensity of fluorescent light Y taken out from the light source device 100 can be increased.

[0092] As described above, according to the light source device 100 of the present embodiment, a light source device 100 in which the utilization efficiency of excitation light E is high and in which it is easy to obtain fluorescent light Y having a desired intensity can be realized.

[0093] In the light source device 100 of the present embodiment, the support member 54 further has a second wall surface 54b that opposes the sixth surface 50f and is separated from the sixth surface 50f. The second wall surface 54b has a third portion 54b3 that is located on a side farther from the support surface 54s and extends in a direction perpendicular to the support surface 54s, and a fourth portion 54b4 that is located on a side closer to the support surface 54s and extends obliquely with respect to the support surface 54s. The fourth portion 54b4 reflects at least a portion of the excitation light E. The distance between the fourth portion 54b4 on the side closer to the support surface 54s and the sixth surface 50f is smaller than the distance between the fourth portion 54b4 on the side closer to the third portion 54b3 and the sixth surface 50f.

[0094] According to this structure, the same effects as those of the first wall surface 54a described above are also produced with respect to the second wall surface 54b. That is, a portion of the excitation light E that is emitted from the light emitting surface 56a of the light emitting element 56 advances through the gap between the sixth surface 50f of the wavelength conversion member 50 and the third portion 54b3, and then is incident on the fourth portion 54b4 that is inclined with respect to the support surface 54s. The excitation light E is reflected by the fourth portion 54b4 and is incident on the sixth surface 50f of the wavelength conversion member 50. Further, excitation light that is emitted from the end portion of the light emitting surface 56a on the +Z side and advances toward the second wall surface 54b through the corner portion of the third surface 50c of the wavelength conversion member 50 on the -Z side is reflected by the third portion 54b3 that extends perpendicularly with respect to the support surface 54s and is incident on the sixth surface 50f of the wavelength conversion member 50. Thus, a light source device 100 in which the utilization efficiency of excitation light is high and in which it is easy to obtain fluorescent light Y having a desired intensity can be realized.

[0095] The light source device 100 of the present embodiment further has an angle conversion member 52 that converts the angular distribution of fluorescent light Y that is emitted from the first surface 50a of the wavelength conversion member 50.

[0096] According to this configuration, fluorescent light Y emitted from the first surface 50a of the wavelength conversion member 50 transmits the angle conversion member 52, and thus the angle distribution of the fluorescent light Y is narrowed. Thereby, the light use efficiency in the optical system of the rear stage of the light source device 100 can be improved.

[0097] The projector 1 of the present embodiment is provided with the light source device 100 of the present embodiment, and thus the light use efficiency is excellent.

[0098] (Second Embodiment)

[0099] Next, the light source device 100 of the second embodiment will be described. Figure 5 The second embodiment of the present application will be described.

[0100] The basic configuration of the projector and the light source device of the second embodiment is the same as that of the first embodiment, and the configuration of the support member is different from that of the first embodiment. Therefore, the description of the basic configuration of the projector and the light source device will be omitted.

[0101] Figure 5 is a cross-sectional view of the light source device 110 of the second embodiment.

[0102] In Figure 5 , the same reference numerals are attached to the same constituent elements as those used in the first embodiment, and the description will be omitted.

[0103] As Figure 5 shown in the drawing, in the light source device 110 of the present embodiment, the support member 64 has a base material 640, a first reflection member 641, and a second reflection member 642. The support member 64 has a support surface 64s, a first wall surface 64a, and a second wall surface 64b. The first wall surface 64a has a first portion 64al extending perpendicularly to the support surface 64s and a second portion 64a2 extending obliquely to the support surface 64s. The second wall surface 64b has a third portion 64b3 extending perpendicularly to the support surface 64s and a fourth portion 64b4 extending obliquely to the support surface 64s.

[0104] The base material 640 has a recess 64h in which the wavelength conversion member 50 is housed. Of the two corner portions of the recess 64h, the first reflection member 641 is provided in one corner portion, and the second reflection member 642 is provided in the other corner portion. The base material 640 includes the support surface 64s, the first portion 64al, and the third portion 64b3. The first reflection member 641 includes the second portion 64a2. The second reflection member 642 includes the fourth portion 64b4. That is, in the support member 64 of the present embodiment, the second portion 64a2 and the fourth portion 64b4 oblique to the support surface 64s are each composed of a reflection member 641, 642 separate from the base material 640.

[0105] The first reflecting member 641 and the second reflecting member 642 can each be made of the same material as the material of the base member 640, or can be made of a different material from the material of the base member 640. In the case where the first reflecting member 641 and the second reflecting member 642 are each made of the same material as the material of the base member 640, a structure in which a metal film or a dielectric multilayer film is formed on the surface of the material can be provided. The other structures of the light source device 110 are the same as those of the first embodiment.

[0106] (Effects of the Second Embodiment)

[0107] In the present embodiment, the same effects as those of the first embodiment, such as the light source device 110 capable of achieving high utilization efficiency of excitation light E and easily obtaining fluorescent light Y having a desired intensity, can also be obtained.

[0108] Further, in the light source device 110 of the present embodiment, the support member 64 has a base member 640 including a support surface 64s, a first portion 64al, and a third portion 64b3, a first reflecting member 641 including a second portion 64a2, and a second reflecting member 642 including a fourth portion 64b4.

[0109] According to this structure, the second portion 64a2 and the fourth portion 64b4 are each made of a member separate from the base member 640, and thus the cutting process of the recess 64h provided in the base member 640 is sometimes easily performed, and the manufacturing of the light source device 110 becomes easy. Further, by making the first reflecting member 641 and the second reflecting member 642 each of a different material from the material of the base member 640, the degree of freedom of the material selection of the first reflecting member 641 and the second reflecting member 642 is increased, and the reflectance of the second portion 64a2 and the fourth portion 64b4 is easily adjusted.

[0110] (Third Embodiment)

[0111] Hereinafter, the same reference numerals are used for the same components as those used in the first embodiment, and the description thereof will be omitted. Figure 6 The third embodiment of the present application will be described.

[0112] The basic structures of the projector and the light source device of the third embodiment are the same as those of the first embodiment, and the structure of the support member is different from that of the first embodiment. Therefore, the description of the basic structures of the projector and the light source device will be omitted.

[0113] Figure 6 is a cross-sectional view of the light source device 120 of the third embodiment.

[0114] In Figure 6 , the same reference numerals are used for the same components as those used in the first embodiment, and the description thereof will be omitted.

[0115] like Figure 6 As shown, in the light source device 120 of this embodiment, the support member 74 includes a support surface 74s, a first wall surface 74a, and a second wall surface 74b. The first wall surface 74a includes a first portion 74a1 extending perpendicularly to the support surface 74s and a second portion 74a2 extending obliquely relative to the support surface 74s. The second wall surface 74b includes a third portion 74b3 extending perpendicularly to the support surface 74s and a fourth portion 74b4 extending obliquely relative to the support surface 74s.

[0116] The dimension W3 of the support surface 74s of the support member 74 along the Z-axis direction is equal to the dimension W2 of the third surface 50c of the wavelength conversion member 50 along the Z-axis direction. Therefore, in this embodiment, unlike the first embodiment, the support surface 74s does not have an exposed portion outside the wavelength conversion member 50. The rest of the structure of the light source device 120 is the same as that of the first embodiment.

[0117] (Effects of the Third Embodiment)

[0118] In this embodiment as well, the same effects as those of the first embodiment can be achieved, namely, the light source device 120 can achieve high utilization efficiency of the excitation light E and can easily obtain the fluorescence Y having a desired intensity.

[0119] In addition, in the case of this embodiment, the dimension W3 of the supporting surface 74s of the supporting component 74 along the Z-axis direction is consistent with the dimension W2 of the wavelength conversion component 50 along the Z-axis direction, so it is easy to align the wavelength conversion component 50 with respect to the supporting surface 74s when manufacturing the light source device 120.

[0120] (Fourth embodiment)

[0121] Below, use Figure 7 A fourth embodiment of the present invention will be described.

[0122] The basic structure of the projector and light source device of the fourth embodiment is the same as that of the first embodiment, but the structure of the supporting member is different from that of the first embodiment. Therefore, the description of the basic structure of the projector and light source device is omitted.

[0123] Figure 7 It is a cross-sectional view of a light source device according to a fourth embodiment.

[0124] exist Figure 7 In the drawings, the same components as those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0125] like Figure 7As shown, in the light source device 130 of the present embodiment, the support member 84 has a support surface 84s, a first wall surface 84a, and a second wall surface 84b. The first wall surface 84a has a first portion 84al that extends perpendicularly with respect to the support surface 84s, and a second portion 84a2 that extends obliquely with respect to the support surface 84s. The second wall surface 84b has a third portion 84b3 that extends perpendicularly with respect to the support surface 84s, and a fourth portion 84b4 that extends obliquely with respect to the support surface 84s.

[0126] In the case of the first embodiment, the second portion and the fourth portion are each constituted by a flat surface. In contrast to this, as Figure 7 As shown, in the case of the present embodiment, the second portion 84a2 and the fourth portion 84b4 are each constituted by an aspherical surface. That is, the second portion 84a2 and the fourth portion 84b4 each include a curved surface. Note that the second portion 84a2 and the fourth portion 84b4 can each be constituted by a curved surface other than an aspherical surface, such as a spherical surface. The other structures of the light source device 130 are the same as in the first embodiment.

[0127] (Effects of the fourth embodiment)

[0128] In the present embodiment, the same effects as in the first embodiment, such as the light source device 130 that enables high utilization efficiency of excitation light E and easily obtains fluorescent light Y having a desired intensity, can also be obtained.

[0129] Note that in the case of the present embodiment, the second portion 84a2 and the fourth portion 84b4 each include a curved surface. According to this structure, compared to the case where the second portion and the fourth portion are each constituted by a flat surface, it is possible to finely control the reflection directions of the excitation light E2 that respectively impinge on the second portion 84a2 and the fourth portion 84b4. Therefore, according to the present embodiment, it is easy to further improve the utilization efficiency of the excitation light E2.

[0130] (Fifth embodiment)

[0131] Hereinafter, the fifth embodiment of the present application will be described using Figure 8 The fifth embodiment of the present application will be described.

[0132] The basic structures of the projector and the light source device of the fifth embodiment are the same as in the first embodiment, and the structure of the support member is different from that of the first embodiment. Therefore, the description of the basic structures of the projector and the light source device will be omitted.

[0133] Figure 8 FIG. 14 is a sectional view of a light source device 140 of the fifth embodiment.

[0134] In Figure 8 , the same reference numerals are assigned to the same constituent elements as those used in the first embodiment, and the description will be omitted.

[0135] like Figure 8 As shown, in the light source device 140 of this embodiment, the supporting member 94 has a supporting surface 94s, a first wall surface 94a, and a second wall surface 94b. The first wall surface 94a is the same as the first embodiment, and has a first portion 94a1 extending perpendicularly to the supporting surface 94s and a second portion 94a2 extending obliquely relative to the supporting surface 94s. On the other hand, the second wall surface 94b is different from the first embodiment and extends perpendicularly to the supporting surface 94s as a whole. The second wall surface 94b is not separated from the sixth surface 50f of the wavelength conversion member 50, but is in contact with the sixth surface 50f. The other structures of the light source device 140 are the same as those of the first embodiment.

[0136] (Effects of the Fifth Embodiment)

[0137] In this embodiment as well, the same effects as those of the first embodiment can be achieved, namely, the light source device 140 can be realized in which the utilization efficiency of the excitation light E is high and the fluorescence Y having a desired intensity can be easily obtained.

[0138] When the power of the excitation light emitted from the light-emitting element is high, the amount of heat generated in the wavelength conversion member increases. Consequently, as the temperature of the wavelength conversion member rises, the wavelength conversion efficiency may decrease. To address this issue, in the light source device 140 of this embodiment, the second wall surface 94b of the support member 94 contacts the sixth surface 50f. Therefore, heat from the wavelength conversion member 50 is conducted not only from the support surface 94s to the support member 94, but also from the second wall surface 94b to the support member 94. This allows for efficient cooling of the wavelength conversion member 50, ensuring wavelength conversion efficiency.

[0139] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In addition, one embodiment of the present invention can be a configuration in which the characteristic portions of the above-described embodiments are appropriately combined.

[0140] For example, in the light source device of the above embodiment, the dimension of the light-emitting surface of the light-emitting element along the Z-axis direction is larger than the dimension of the third surface of the wavelength conversion member along the Z-axis direction. However, the dimension of the light-emitting surface of the light-emitting element along the Z-axis direction may be equal to or smaller than the dimension of the third surface of the wavelength conversion member along the Z-axis direction.

[0141] Further, the specific description of the shape, number, arrangement, material, and the like of each constituent element of the light source device and the projector is not limited to the above-described embodiments and can be appropriately changed. In addition, in the above-described embodiments, an example in which the light source device of the present application is mounted on a projector using a liquid crystal panel is shown, but the present application is not limited thereto. The light source device of the present application can also be applied to a projector using a digital micromirror device as a light modulation device. In addition, the projector can not have a plurality of light modulation devices and can have only one light modulation device.

[0142] In the above-described embodiments, an example in which the light source device of the present application is applied to a projector is shown, but the present application is not limited thereto. The light source device of the present application can also be applied to a lighting fixture, a headlight of an automobile, and the like.

[0143] The light source device of one embodiment of the present application can have the following structure.

[0144] The light source device of one embodiment of the present application includes a light-emitting element including a light-emitting surface from which first light having a first wavelength band is emitted, a wavelength conversion member including a phosphor which converts the first light emitted from the light-emitting element into second light having a second wavelength band different from the first wavelength band, and a support member which supports the wavelength conversion member. The wavelength conversion member includes a first surface and a second surface which cross a length direction of the wavelength conversion member and are located on opposite sides of each other, a third surface and a fourth surface which cross the first surface and the second surface and are located on opposite sides of each other, and a fifth surface and a sixth surface which cross the third surface and the fourth surface and are located on opposite sides of each other, and the second light is emitted from the first surface. The light-emitting surface is provided opposite to the third surface. The support member includes a support surface opposite to the fourth surface and a first wall surface opposite to the fifth surface and separated from the fifth surface. The first wall surface includes a first portion on the wavelength conversion member side and a second portion on the support surface side. The first portion extends in a direction perpendicular to the support surface. The second portion is inclined away from the fifth surface as it goes from the support surface toward the first portion. The second portion reflects at least a part of the first light.

[0145] In the light source device of one embodiment of the present application, the light-emitting surface can overlap part of the third surface and another part of the light-emitting surface can overlap a gap between the fifth surface and the first wall surface when the light-emitting surface is viewed from the support surface.

[0146] In the light source device of one embodiment of the present application, the second portion can include a curved surface.

[0147] In the light source device of one embodiment of the present application, the support member can include a base material including the support surface and the first portion and a first reflective member including the second portion.

[0148] In the light source device of one embodiment of the present application, the support member can further include a second wall surface that is in contact with the sixth surface.

[0149] In the light source device of one embodiment of the present application, the first portion and the third portion can be flat surfaces, the second portion and the fourth portion can be flat surfaces, and the following conditional expression (1) can be satisfied when the width of the light emitting surface is W1, the width of the fifth surface and the sixth surface in the portion of the wavelength conversion member that is in contact with the support surface is W2, and the width between the connection portion of the support surface and the third portion and the connection portion of the support surface and the fourth portion is W3, in cross-sectional view observation of the first side wall and the second side wall.

[0150] W1 < W3 < W2 … (1)

[0151] In the light source device of one embodiment of the present application, the fourth portion can include a curved surface.

[0152] In the light source device of one embodiment of the present application, the support member can include a base material including the support surface and the third portion and a second reflective member including the fourth portion.

[0153] In the light source device of one embodiment of the present application, the support member can further include a second wall surface that is in contact with the sixth surface.

[0154] In the light source device of one embodiment of the present application, part of the light emitting surface can overlap with the third surface and another part of the light emitting surface can overlap with the gap portion between the fifth surface and the first wall surface, in cross-sectional view observation of the support surface.

[0155] In the light source device of one embodiment of the present application, the light source device can further include an angle conversion member that converts the angle distribution of the second light emitted from the first surface.

[0156] The projector of one embodiment of the present application can have the following structure.

[0157] The projector of one embodiment of the present application includes the light source device of one embodiment of the present application, a light modulation device that modulates light including the second light emitted from the light source device in accordance with image information, and a projection optical device that projects light modulated by the light modulation device.

Claims

1. A light source device comprising: a light emitting element having a light emitting surface from which a first light having a first wavelength band is emitted; a wavelength conversion member including a phosphor that converts the first light emitted from the light emitting element into a second light having a second wavelength band different from the first wavelength band; and a support member that supports the wavelength conversion member, wherein the wavelength conversion member has a first surface and a second surface that cross a length direction of the wavelength conversion member and are located on opposite sides of each other, a third surface and a fourth surface that cross the first surface and the second surface and are located on opposite sides of each other, and a fifth surface and a sixth surface that cross the first surface and the second surface and cross the third surface and the fourth surface and are located on opposite sides of each other, wherein the wavelength conversion member emits the second light from the first surface, wherein the light emitting surface is disposed opposite the third surface, wherein the support member has a support surface opposite the fourth surface and a first wall surface opposite the fifth surface and separated from the fifth surface, wherein the first wall surface has a first portion on the light emitting element side and a second portion on the support surface side, wherein the first portion extends in a direction perpendicular to the support surface, wherein the second portion is inclined away from the fifth surface as it goes from the support surface toward the first portion, and the second portion reflects at least a portion of the first light, wherein the support member further has a second wall surface opposite the sixth surface and separated from the sixth surface, wherein the second wall surface has a third portion on the light emitting element side and a fourth portion on the support surface side, wherein the third portion extends in a direction perpendicular to the support surface, wherein the fourth portion is inclined away from the sixth surface as it goes from the support surface toward the third portion, and the fourth portion reflects at least a portion of the first light, wherein the first portion and the third portion are flat surfaces, wherein the second portion and the fourth portion are flat surfaces, and wherein, when a cross section connecting the first wall surface and the second wall surface is observed, the following condition (1) is satisfied: W1 > W3 > W2... (1) where W1 is a width of the light emitting surface, W2 is a width of the fifth surface and the sixth surface at a portion of the wavelength conversion member that abuts the support surface, and W3 is a width between a connecting portion of the support surface and the second portion and a connecting portion of the support surface and the fourth portion.

2. The light source device according to claim 1, wherein the support member has a base material that includes the support surface and the first portion, and a first reflective member that includes the second portion.

3. The light source device according to claim 1, wherein the support member has a base material that includes the support surface and the third portion, and a second reflective member that includes the fourth portion.

4. The light source device according to claim 1, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ When the light emitting surface is viewed from the support surface, a part of the light emitting surface overlaps the third surface, and another part of the light emitting surface overlaps a gap part between the fifth surface and the first wall surface.

5. The light source device according to claim 1, wherein The light source device further has an angle conversion member that converts an angle distribution of the second light emitted from the first surface.

6. A projector comprising: the light source device according to any one of claims 1 to 5; a light modulation device that modulates light including the second light emitted from the light source device in accordance with image information; and a projection optical device that projects the light modulated by the light modulation device.

Images