Light source device and projector

Abstract

To provide a light source device and a projector that can improve the heat dissipation of a light guide member.SOLUTION: A light source device of the present invention includes: a light-emitting element that emits light; a light guide member including a first surface to which the light emitted from the light-emitting element is incident, a second surface facing opposite to the first surface, and a third surface and a fourth surface intersecting with the first surface and the second surface and facing opposite to each other, and a light emission part that emits light; a support part that forms a bottom surface of a holding groove to hold the light guide member and includes a support surface to support the second surface of the light guide member; a first side wall part disposed facing the third surface of the light guide member and including a first wall surface forming one inner side surface of the holding groove; and a second side wall part disposed facing the fourth surface of the light guide member and including a second wall surface forming the other inner side surface of the holding groove. At least one of the first side wall part and the second side wall part is formed of a member separate from the support part.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] 2. Description of the Related Art As a light source device for use in a projector, a light source device has been proposed that utilizes fluorescence emitted from a phosphor when the phosphor is irradiated with excitation light emitted from a light emitting element.

[0003] The following Patent Document 1 discloses a light source device including an excitation light source having a light emitting element and a substrate, a base member for fixing the substrate of the excitation light source, a phosphor rod for converting the excitation light emitted from the light emitting element into fluorescence, and a holder for holding the phosphor rod. In the light source device, the phosphor rod is held in a groove formed in the holder. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 254439 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned light source device, the holding portion and the base member are formed as a single unitary part. Therefore, when improving the machining accuracy of the groove portion, even if there is no problem with the accuracy of the base member, the part as a whole may be judged to be defective, resulting in a problem of reduced yield. In addition, even if a high-cost material with excellent thermal conductivity is used for the holder, it is necessary to use the same high-cost material for the base member. In other words, when the holder and base member are integrated, it is not possible to select the optimal material or processing accuracy for each member, resulting in a problem of increased costs. [Means for solving the problem]

[0006] In order to solve the above problems, a light source device of one embodiment of the present invention includes a light-emitting element that emits light, a substrate that supports the light-emitting element, a light-guiding member having a first surface on which the light emitted from the light-emitting element is incident and a second surface facing opposite to the first surface, a housing member on which the second surface of the light-guiding member is placed and which houses at least a portion of the light-guiding member, and a base member that is separate from the housing member and fixes the substrate, and the housing member is supported by the base member.

[0007] A projector according to one aspect of the present invention comprises a light source device according to one aspect of the present invention, a light modulation device that modulates light emitted from the light source device, and a projection optical device that projects the light modulated by the light modulation device. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a projector according to a first embodiment. [Diagram 2] FIG. 2 is a schematic diagram illustrating the configuration of a first lighting device. [Diagram 3] FIG. [Figure 4] 4 is a plan view of the light source device as viewed from the Y-axis direction. FIG. [Diagram 5] 5 is a cross-sectional view of the light source device taken along line VV in FIG. 4. [Figure 6] FIG. 11 is an exploded perspective view showing a configuration of a main part of a light source device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, one embodiment of the present invention will be described. The projector of this embodiment is an example of a projector that uses a liquid crystal panel as a light modulation device. In the drawings, the dimensions of the components may be shown on different scales in order to make the components easier to see.

[0010] FIG. 1 is a diagram showing a schematic configuration of a projector 1 according to the present embodiment. 1, the projector 1 of this embodiment is a projection type image display device that displays a color image on a screen SCR, which is a projection surface. The projector 1 includes three light modulation devices corresponding to the respective colors of red light LR, green light LG, and blue light LB.

[0011] The projector 1 includes a first illumination device 20, a second illumination device 21, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a light combining element 5, and a projection optical device 6.

[0012] The first illumination device 20 emits yellow fluorescence Y toward the color separation optical system 3. The second illumination device 21 emits blue light LB toward the light modulation device 4B. Detailed configurations of the first illumination device 20 and the second illumination device 21 will be described later.

[0013] In the following, in the drawings, an XYZ Cartesian coordinate system is used for explanation as necessary. The Z axis is an axis along the up-down direction of the projector 1. The X axis is an axis parallel to the optical axis AX1 of the first lighting device 20 and the optical axis AX2 of the second lighting device 21. The Y axis is an axis perpendicular to the X axis and the Z axis. The optical axis AX1 of the first lighting device 20 is the central axis of the fluorescent light Y emitted from the first lighting device 20. The optical axis AX2 of the second lighting device 21 is the central axis of the blue light LB emitted from the second lighting device 21. One of the two directions along the X axis is called the +X direction, and the opposite direction is called the -X direction, one of the two directions along the Y axis is called the +Y direction, and the opposite direction is called the -Y direction, and one of the two directions along the Z axis is called the +Z direction, and the opposite direction is called the -Z direction. In addition, when the two directions along the X-axis are not distinguished, it will be referred to as the X-axis direction, when the two directions along the Y-axis are not distinguished, it will be referred to as the Y-axis direction, and when the two directions along the Z-axis are not distinguished, it will be referred to as the Z-axis direction.

[0014] The color separation optical system 3 separates the yellow fluorescence Y emitted from the first illumination device 20 into red light LR and green light LG. The color separation optical system 3 includes a dichroic mirror 7, a first reflecting mirror 8a, and a second reflecting mirror 8b.

[0015] The dichroic mirror 7 separates the fluorescence 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 reflecting mirror 8b is disposed in the optical path of the green light LG. The second reflecting mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the optical modulation device 4G. The first reflecting mirror 8a is disposed in the optical path of the red light LR. The first reflecting mirror 8a reflects the red light LR transmitted through the dichroic mirror 7 toward the optical modulation device 4R.

[0016] On the other hand, the blue light LB emitted from the second illumination device 21 is reflected by the reflecting mirror 9 towards the light modulation device 4B.

[0017] The configuration of the second illumination device 21 will be described below. The second illumination device 21 includes a second light source unit 81, a condenser lens 82, a diffusion plate 83, a rod lens 86, and a relay lens 87. The second light source unit 81 is composed of at least one semiconductor laser. The second light source unit 81 emits blue light LB composed of laser light. Note that the second light source unit 81 is not limited to a semiconductor laser, and may be composed of an LED that emits blue light.

[0018] The condenser lens 82 is composed of a convex lens. The condenser lens 82 causes the blue light LB emitted from the second light source unit 81 to enter the diffusion plate 83 in a substantially condensed state. The diffusion plate 83 diffuses the blue light LB emitted from the condenser lens 82 with a predetermined diffusion degree, and generates blue light LB having a substantially uniform light distribution similar to that of the fluorescent light Y emitted from the first lighting device 20. As the diffusion plate 83, for example, ground glass made of optical glass is used.

[0019] The blue light LB diffused by the diffusion plate 83 is incident on the rod lens 86. The rod lens 86 has a prismatic shape extending along the optical axis AX2 direction of the second illumination device 21. The rod lens 86 has a light incident end surface 86a provided at one end and a light exit end surface 86b provided at the other end. The diffusion plate 83 is fixed to the light incident end surface 86a of the rod lens 86 via an optical adhesive (not shown). It is desirable to match the refractive index of the diffusion plate 83 and the refractive index of the rod lens 86 as closely as possible.

[0020] The blue light LB is propagated while being totally reflected inside the rod lens 86, and is emitted from the light emitting end surface 86b with the uniformity of the illuminance distribution being enhanced. The blue light LB emitted from the rod lens 86 is incident on the relay lens 87. The relay lens 87 causes the blue light LB, whose uniformity of the illuminance distribution has been enhanced by the rod lens 86, to be incident on the reflecting mirror 9.

[0021] The shape of the light exit end surface 86b of the rod lens 86 is a rectangle that is approximately similar to the shape of the image forming area of ​​the light modulation device 4B. This allows the blue light LB exiting from the rod lens 86 to efficiently enter the image forming area of ​​the light modulation device 4B.

[0022] The light modulation device 4R modulates the red light LR according to image information to form image light corresponding to the red light LR. The light modulation device 4G modulates the green light LG according to image information to form image light corresponding to the green light LG. The light modulation device 4B modulates the blue light LB according to image information to form image light corresponding to the blue light LB.

[0023] For example, a transmissive liquid crystal panel is used for each of the light modulation devices 4R, 4G, and 4B. A polarizing plate (not shown) is disposed on the entrance side and exit side of each of the liquid crystal panels. The polarizing plate transmits only linearly polarized light in a specific direction.

[0024] A field lens 10R is disposed on the incident side of the optical modulation device 4R. A field lens 10G is disposed on the incident side of the optical modulation device 4G. A field lens 10B is disposed on the incident side of the optical modulation device 4B. The field lens 10R collimates the chief ray of the red light LR incident on the optical modulation device 4R. The field lens 10G collimates the chief ray of the green light LG incident on the optical modulation device 4G. The field lens 10B collimates the chief ray of the blue light LB incident on the optical modulation device 4B.

[0025] The light combining element 5 receives the image light emitted from the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, combines the image light corresponding to the red light LR, the green light LG, and the blue light LB, and emits the combined image light toward the projection optical device 6. The light combining element 5 may be, for example, a cross dichroic prism.

[0026] The projection optical device 6 is composed of a plurality of projection lenses. The projection optical device 6 enlarges and projects the image light combined by the light combining element 5 onto the screen SCR. As a result, a color image is displayed on the screen SCR.

[0027] Next, the configuration of the first illumination device 20 will be described. FIG. 2 is a schematic configuration diagram of the first illumination device 20. As shown in FIG. As shown in FIG. 2, the first illumination device 20 includes a light source device 100, an integrator optical system 70, a polarization conversion element 102, and a superimposing optical system 103.

[0028] FIG. 3 is a perspective view showing a schematic configuration of the light source device 100. As shown in FIG. 2 and 3, light source device 100 includes a wavelength conversion member 50, a first light source unit 51, an angle conversion member 52, a mirror 53, a base member 60, a holding member 58, a pair of fixing members 64, a position regulating member 65, a first pressing member 90, and a second pressing member 91. The wavelength conversion member 50 of this embodiment corresponds to the "light guiding member" in the claims.

[0029] The wavelength conversion member 50 has a rectangular prism shape extending along the X-axis and has six faces. The sides of the wavelength conversion member 50 extending along the X-axis are longer than the sides extending along the Y-axis and the Z-axis. Therefore, the X-axis corresponds to the longitudinal direction of the wavelength conversion member 50. The length of the side extending along the Y-axis is equal to the length of the side extending along the Z-axis. That is, the cross-sectional shape of the wavelength conversion member 50 cut along a plane along the YZ plane perpendicular to the X-axis is a square. Note that the cross-sectional shape of the wavelength conversion member 50 cut along a plane along the YZ plane may be rectangular.

[0030] The wavelength conversion member 50 has a first surface 50a and a second surface 50b, a third surface 50c and a fourth surface 50d, and a fifth surface 50e and a sixth surface 50f.

[0031] The fifth surface 50e and the sixth surface 50f intersect with the X-axis along the longitudinal direction of the wavelength conversion member 50, and are located on opposite sides to each other along the X-axis. In this embodiment, the fifth surface 50e is located on the +X side, which is one side of the X-axis direction along the X-axis, and the sixth surface 50f is located on the -X side, which is the opposite direction of the X-axis direction.

[0032] The first surface 50a and the second surface 50b are surfaces that intersect with the fifth surface 50e and the sixth surface 50f, intersect with the X-axis along the longitudinal direction of the wavelength conversion member 50, and face opposite sides along the Y-axis which is perpendicular in this embodiment. In this embodiment, the first surface 50a is located on one side of the Y-axis along the Y-axis, that is, the -Y side, and the second surface 50b is located on the other side of the Y-axis along the Y-axis, that is, the +Y side. In this embodiment, the first surface 50a of the wavelength conversion member 50 is a surface onto which light emitted from a light emitting element 56 of a first light source unit 51 (described later) is incident.

[0033] The third surface 50c and the fourth surface 50d intersect with the first surface 50a and the second surface 50b, and intersect with the X-axis and the Y-axis, and in this embodiment, face opposite each other along the perpendicular Z-axis. In this embodiment, the third surface 50c is located in the +Z direction, which is one side of the Z-axis direction, and the fourth surface 50d is located in the -Z direction, which is the other side of the Z-axis direction.

[0034] In the following description, when the first surface 50a, the second surface 50b, the third surface 50c, and the fourth surface 50d are not distinguished from each other, they may be simply referred to as side surfaces 50a, 50b, 50c, and 50d.

[0035] The wavelength conversion member 50 contains at least a phosphor, and converts the excitation light E having a first wavelength band emitted from the light emitting element 56 of the first light source unit 51 into fluorescence Y having a second wavelength band different from the first wavelength band. The excitation light E enters the wavelength conversion member 50 from the first surface 50a. The fluorescence Y is guided inside the wavelength conversion member 50 and then emitted from the fifth surface 50e. The excitation light E of this embodiment corresponds to the "first light" in the claims. The fluorescence Y of this embodiment corresponds to the "second light" in the claims. The fifth surface 50e of this embodiment corresponds to the "light emitting unit" in the claims.

[0036] The wavelength conversion member 50 contains a ceramic phosphor made of a polycrystalline phosphor that converts the wavelength of the excitation light E into the fluorescence Y. The second waveband of the fluorescence Y is, for example, a yellow waveband of 490 to 750 nm. That is, the fluorescence Y is yellow fluorescence containing a red light component and a green light component.

[0037] The wavelength conversion member 50 may contain a single crystal phosphor instead of a polycrystalline phosphor. Alternatively, the wavelength conversion member 50 may be made of fluorescent glass. Alternatively, the wavelength conversion member 50 may be made of a material in which a large number of phosphor particles are dispersed in a binder made of glass or resin. The wavelength conversion member 50 made of such a material converts the excitation light E into fluorescence Y.

[0038] Specifically, the material of the wavelength conversion member 50 includes, for example, an yttrium-aluminum-garnet (YAG) phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, the material of the wavelength conversion member 50 may be a material obtained by mixing raw material powders containing constituent elements such as Y2O3, Al2O3, and CeO3 and causing a solid-phase reaction, Y-Al-O amorphous particles obtained by a wet method such as a coprecipitation method or a sol-gel method, or YAG particles obtained by a gas phase method such as a spray drying method, a flame pyrolysis method, or a thermal plasma method.

[0039] The first light source unit 51 has a substrate 55 and a plurality of light emitting elements 56. The first light source unit 51 may include other optical members such as a light guide plate, a diffusion plate, a lens, etc. The substrate 55 of the first light source unit 51 is fixed to a base member 60 in a region not shown. The plurality of light emitting elements 56 are fixed to one surface 55a of the substrate 55. The number of light emitting elements 56 in the first light source unit 51 of the present embodiment is not particularly limited.

[0040] The light emitting element 56 has a light emitting surface 56a that emits excitation light E in a 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 first surface 50a of the wavelength conversion member 50, and emits excitation light E toward the first surface 50a. The first wavelength band is, for example, a wavelength band from blue to purple of 400 nm to 480 nm, and the peak wavelength is, for example, 445 nm.

[0041] 3, holding member 58 is a block-shaped member, and has a groove portion 59 on surface 58a that holds a part of wavelength conversion member 50. Holding member 58 is supported by base member 60. Holding member 58 is supported by base member 60. Holding member 58 functions as a heat dissipation member that diffuses heat generated by wavelength conversion member 50 supported inside groove portion 59 and releases it to the outside.

[0042] Fig. 4 is a plan view of the light source device 100 as viewed from the Y-axis direction. In Fig. 4, in order to make the drawing easier to see, the first light source unit 51 is omitted from the illustration.

[0043] The groove portion 59 extends in the X-axis direction along the longitudinal direction of the wavelength conversion member 50 and accommodates a part of the wavelength conversion member 50 therein. The wavelength conversion member 50 includes a first protrusion 151 that protrudes from the groove 59 in the +X direction, and a second protrusion 152 that protrudes from the groove 59 in the -X direction. The first protrusion 151 includes the ends of the first surface 50a, the second surface 50b, the third surface 50c, the fourth surface 50d, and the fifth surface 50e on the +X direction side. The second protrusion 152 includes the ends of the first surface 50a, the second surface 50b, the third surface 50c, the fourth surface 50d, and the sixth surface 50f on the -X direction side. In other words, both ends of the wavelength conversion member 50 protrude outside the groove portion 59 of the holding member 58 .

[0044] The inventors of the present invention considered that when a long groove is formed in an integrated part by cutting, it is difficult to ensure the surface accuracy of the groove, and when the machining accuracy of the groove is increased, the part as a whole is judged to be defective even if there is no problem with the accuracy other than the groove, resulting in a problem of reduced yield. In addition, when a high-cost material with excellent thermal conductivity is used as the holding member to increase the heat dissipation of the wavelength conversion member, it becomes necessary to use a high-cost material for the base member that is integrated with the holding member. In other words, an over-specified material is used for the base member that does not require high thermal conductivity compared to the holding member. In this way, when the holding member and the base member are configured as an integrated part, it is not possible to select the optimal material or machining accuracy for each member, which results in increased costs. Therefore, the present inventors considered that the above problem could be solved by forming the holding member having the groove and the base member for fixing the light source as separate members.

[0045] For this reason, in the light source device 100 of this embodiment, the base member 60 and the holding member 58 are configured as separate members. Since the holding member 58 functions as a heat dissipation member as described above, it is preferable that the holding member 58 be made of a material with high thermal conductivity. In this embodiment, the thermal conductivity of holding member 58 is higher than that of base member 60. Holding member 58 is made of, for example, an aluminum alloy such as A6061 having a thermal conductivity (25°C) of 170 W / (m·k). Moreover, base member 60 is made of, for example, an aluminum die-cast such as ADC12 having a thermal conductivity (25°C) of 96 W / (m·k). With this configuration, heat from wavelength conversion member 50 is efficiently transferred to holding member 58, thereby improving the heat dissipation property of wavelength conversion member 50.

[0046] According to the light source device 100 of the present embodiment, the holding member 58 that holds the wavelength conversion member 50 can be made of a material with excellent thermal conductivity, and the base member 60 can be made of a material with relatively low thermal conductivity. In other words, the optimal materials can be used for the holding member 58 and the base member 60.

[0047] Furthermore, in the light source device 100 of the present embodiment, since the holding member 58 and the base member 60 are formed of separate members, it is possible to make the processing precision required for the groove portion 59 of the holding member 58 different from the processing precision required for the base member 60. Therefore, the yield of the holding member 58 does not affect the yield of the base member 60, so that it is possible to suppress a decrease in the overall yield.

[0048] Therefore, according to the light source device 100 of the present embodiment, the optimum materials and processing precision can be selected for the holding member 58 and the base member 60, and therefore it is possible to suppress an increase in costs, thereby ultimately achieving cost reduction.

[0049] The base member 60 has a support portion 560, a spring fixing portion 540, a first accommodating portion 541, a second accommodating portion 542, a third accommodating portion 543, a fourth accommodating portion 544, a fifth accommodating portion 545, a sixth accommodating portion 546, and a light source fixing portion 547.

[0050] The support portion 560 is a recess that supports the holding member 58. The support portion 560 restricts movement of the holding member 58 to both sides in the Z-axis direction. The pair of fixing members 64 fix the position of the holding member 58 with respect to the support portion 560. One of the pair of fixing members 64 is disposed at the end of the holding member 58 on the +X side, and the other of the pair of fixing members 64 is disposed at the end of the holding member 58 on the -X side. The support portion 560 may have a positioning pin for positioning the holding member 58 at a predetermined position.

[0051] In this embodiment, the holding member 58 is supported by the support portion 560 of the base member 60 via the thermally conductive member 66. Examples of the thermally conductive member 66 include a thermally conductive adhesive and a thermally conductive grease. With this configuration, the holding member 58 and the support portion 560 are connected to each other via the thermally conductive member 66 in a manner that allows thermal transfer, so that the heat of the holding member 58 can be efficiently transferred to the support portion 560. Therefore, by dissipating the heat transferred from the wavelength conversion member 50 to the holding member 58 to the support portion 560, the heat dissipation property of the wavelength conversion member 50 can be further improved.

[0052] 2 and 4, each fixing member 64 is disposed so as to abut against surface 58a on the -Y side of holding member 58 supported by support portion 560, and to straddle in the direction along the Z axis, with both ends fixed to base member 60. Each fixing member 64 may be made of an elastic member such as a leaf spring, or may be made of a plate material that does not have spring properties. There are no particular limitations on the method for fixing each fixing member 64 to base member 60, and any of screw fastening, adhesive bonding, etc. may be used. In this manner, the pair of fixing members 64 supports the holding member 58 on the support portion 560 in a state in which the position of the holding member 58 in the Y-axis direction is restricted.

[0053] In this embodiment, each fixing member 64 is configured to press the retaining member 58 from the -Y side of the support portion 560 toward the +Y side, but a configuration in which the retaining member 58 is pressed against the inner surface of the support portion 560 from the +Z side or -Z side by a spring or the like may also be adopted.

[0054] The position restricting portion 65, together with the first pressing member 90, restricts the position of the wavelength conversion member 50 relative to the base member 60. The position restricting portion 65 restricts the movement of the wavelength conversion member 50 in the Z-axis direction. The position regulating portion 65 holds the first protruding portion 151 or the second protruding portion 152 protruding from the groove portion 59 of the holding member 58, and regulates the position of the first protruding portion 151 or the second protruding portion 152 with respect to the groove portion 59. The position regulating portion 65 includes a pair of regulating members 651, 652 that hold the first protruding portion 151, and a pair of regulating members 653, 654 that hold the second protruding portion 152.

[0055] One of the restriction members 651 which holds the first protrusion 151 is fixed to the third housing portion 543 via a screw 97, and the other restriction member 652 is fixed to the fourth housing portion 544 via a screw 97. One of the restriction members 653 which holds the second protrusion 152 is fixed to the fifth housing portion 545 via a screw 97, and the other restriction member 654 is fixed to the sixth housing portion 546 via a screw 97.

[0056] The pair of regulating members 651, 652 can adjust their respective positions in the Z axis direction by an adjustment mechanism (not shown). Similarly, the pair of regulating members 653, 654 can adjust their respective positions in the Z axis direction by an adjustment mechanism (not shown).

[0057] In this manner, the wavelength conversion member 50 of this embodiment is held within the groove portion 59 with the movement in the Z-axis direction of the first protrusion 151 and the second protrusion 152 protruding outside the groove portion 59 being restricted by the position restricting portion 65.

[0058] The substrate 55 of the first light source unit 51 is fixed to a light source fixing portion 547 of the base member 60 via, for example, a screw member.

[0059] The first pressing member 90 regulates the position of the wavelength conversion member 50 in the Y-axis direction relative to the holding member 58 inside the groove portion 59. The first pressing member 90 is disposed facing the support surface 59s of the groove portion 59. In this way, the first pressing member 90 regulates the wavelength conversion member 50 from moving in the Y-axis direction inside the groove portion 59. The first pressing member 90 is made of an elastically deformable material. As an example, the first pressing member 90 is made of a leaf spring made of a metal material, for example, a stainless steel material such as SUS304. In this embodiment, it is desirable that each of the two first pressing members 90 be disposed at a position not overlapping with the light emitting element 56 of the first light source unit 51.

[0060] The first pressing member 90 presses the wavelength conversion member 50 against the support surface 59s of the groove portion 59. The first pressing member 90 is fixed to the base member 60.

[0061] The mirror 53 is provided on the sixth surface 50f of the wavelength conversion member 50. The mirror 53 guides light inside the wavelength conversion member 50 and reflects the fluorescence Y that reaches the sixth surface 50f. The mirror 53 is made of a metal film or a dielectric multilayer film formed on the sixth surface 50f of the wavelength conversion member 50.

[0062] The spring fixing portions 540 are disposed on both sides of the groove portion 59 in the Z-axis direction along the short side of the wavelength conversion member 50. The spring fixing portions 540 fix, with screws 96, both ends of the first pressing member 90 disposed across the wavelength conversion member 50 in the Z-axis direction.

[0063] The first accommodating portion 541 is a recess communicating with the groove portion 59 in the +X direction. The first accommodating portion 541 penetrates to the outer edge 60d of the base member 60. The first accommodating portion 541 accommodates the first protruding portion 151 of the wavelength conversion member 50 protruding from the groove portion 59. The first accommodating portion 541 also holds the angle conversion member 52 fixed to the fifth surface 50e of the wavelength conversion member 50. In this embodiment, the angle conversion member 52 fixed to the fifth surface 50e of the first protruding portion 151 is held by the base member 60. The light exit surface 52b of the angle conversion member 52 housed in the first housing portion 541 is flush with the outer edge 60d of the base member 60 in a plan view.

[0064] The second accommodating portion 542 is a recess that communicates with the groove portion 59 in the -X direction. The second accommodating portion 542 penetrates to the outer edge 60d of the base member 60. The second accommodating portion 542 accommodates the second protruding portion 152 of the wavelength converting member 50 that protrudes from the groove portion 59. In this embodiment, the mirror 53 is provided on the sixth surface 50f of the second protruding portion 152. The second accommodating portion 542 accommodates the mirror 53 provided on the sixth surface 50f of the wavelength converting member 50.

[0065] The second pressing member 91 presses the mirror 53 accommodated in the second accommodation portion 542 from the outer surface 53t side toward the sixth surface 50f of the wavelength conversion member 50. As a result, the reflecting surface 53r of the mirror 53 is in close contact with the sixth surface 50f of the wavelength conversion member 50. The second pressing member 91 has a pressing portion 911 and an elastic portion 912. The second pressing member 91 is made of a plate-shaped metal material having elasticity, and the pressing portion 911 and the elastic portion 912 are integrally formed. With this configuration, the pressing portion 911 can reliably press the mirror 53, and the elastic portion 912 can apply a pressing force to the pressing portion 911. The pressing portion 911 abuts against the outer surface 53t of the mirror 53 and presses the mirror 53.

[0066] The third accommodating portion 543 is a recess that communicates with the first accommodating portion 541 in the +Z direction. The third accommodating portion 543 accommodates a regulating member 651 of a position regulating portion 65 that holds the +Z side of the first protruding portion 151 of the wavelength conversion member 50 accommodated in the first accommodating portion 541.

[0067] The fourth accommodating portion 544 is a recess that communicates with the first accommodating portion 541 in the -Z direction. The fourth accommodating portion 544 accommodates the regulating member 652 of the position regulating portion 65 that holds the -Z side of the first protruding portion 151 of the wavelength conversion member 50 accommodated in the first accommodating portion 541.

[0068] The fifth accommodating portion 545 is a recess that communicates with the second accommodating portion 542 in the +Z direction. The fifth accommodating portion 545 accommodates the regulating member 653 of the position regulating portion 65 that holds the +Z side of the second protrusion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0069] The sixth accommodating portion 546 is a recess that communicates with the second accommodating portion 542 in the -Z direction. The sixth accommodating portion 546 accommodates the regulating member 654 of the position regulating portion 65 that holds the -Z side of the second protrusion portion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0070] In the first lighting device 20, when the excitation light E emitted from the first light source unit 51 is incident on the wavelength conversion member 50, the phosphor contained in the wavelength conversion member 50 is excited, and the fluorescence Y is emitted from an arbitrary light-emitting point. The fluorescence Y travels in all directions from an arbitrary light-emitting point, but the fluorescence Y traveling toward the four side surfaces 50a, 50b, 50c, and 50d travels toward the fifth surface 50e or the sixth surface 50f while repeating total reflection at multiple points on the side surfaces 50a, 50b, 50c, and 50d. The fifth surface 50e emits the fluorescence Y that has been guided inside the wavelength conversion member 50 by being propagated by total reflection. In the case of this embodiment, the fluorescence Y traveling toward the fifth surface 50e is incident on the angle conversion member 52 provided on the fifth surface 50e. The fluorescence Y traveling toward the sixth surface 50f is reflected by the mirror 53 and travels toward the fifth surface 50e.

[0071] Of the excitation light E incident on the wavelength conversion member 50, a portion of the excitation light E that is not used to excite the phosphor is reflected by the members surrounding the wavelength conversion member 50, including the light emitting element 56 of the first light source unit 51, or by the mirror 53 provided on the second surface 50b. Therefore, a portion of the excitation light E is trapped inside the wavelength conversion member 50 and reused.

[0072] Angle conversion member 52 is provided on fifth surface 50e of wavelength conversion member 50. Angle conversion member 52 is composed of, for example, a tapered rod. Angle conversion member 52 has a light incident surface 52a on which fluorescence Y emitted from wavelength conversion member 50 is incident, a light exit surface 52b from which fluorescence Y exits, and a side surface 52c that reflects the incident fluorescence Y toward light exit surface 52b.

[0073] The angle conversion member 52 has a quadrangular pyramid shape, and the cross-sectional area perpendicular to the optical axis J expands along the light traveling direction. Therefore, the area of ​​the light exit surface 52b is larger than the area of ​​the light incident surface 52a. The axis that passes through the centers of the light exit surface 52b and the light incident surface 52a and is parallel to the X-axis is defined as the optical axis J of the angle conversion member 52. The optical axis J of the angle conversion member 52 coincides with the optical axis AX1 of the first lighting device 20.

[0074] The fluorescence Y incident on the angle conversion member 52 changes direction each time it is totally reflected by the side surface 52c while traveling inside the angle conversion member 52 so as to approach a direction parallel to the optical axis J. In this way, the angle conversion member 52 converts the emission angle distribution of the fluorescence Y emitted from the fifth surface 50e of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum emission angle of the fluorescence Y on the light emission surface 52b smaller than the maximum incidence angle of the fluorescence Y on the light incidence surface 52a.

[0075] Generally, the etendue of light, which is defined as the product of the area of ​​the light exit region and the maximum exit angle, which is the solid angle of the light, is preserved, and therefore the etendue of the fluorescence Y is preserved both before and after transmission through the angle conversion member 52. As described above, the angle conversion member 52 has a configuration in which the area of ​​the light exit surface 52b is larger than the area of ​​the light incident surface 52a. For this reason, from the viewpoint of etendue preservation, the angle conversion member 52 can make the maximum exit angle of the fluorescence Y on the light exit surface 52b smaller than the maximum incident angle of the fluorescence Y on the light incident surface 52a.

[0076] The angle conversion member 52 is fixed to the wavelength conversion member 50 via an optical adhesive (not shown) so that the light incident surface 52a faces the fifth surface 50e of the wavelength conversion member 50. That is, the angle conversion member 52 and the wavelength conversion member 50 are in contact with each other via an optical adhesive, and no gap, such as an air layer, is provided between the angle conversion member 52 and the wavelength conversion member 50. If a gap is provided between the angle conversion member 52 and the wavelength conversion member 50, the fluorescence Y that reaches the light incident surface 52a of the angle conversion member 52 and is incident on the light incident surface 52a at an angle equal to or greater than the critical angle is totally reflected by the light incident surface 52a and cannot be incident on the angle conversion member 52. In contrast, if no gap is provided between the angle conversion member 52 and the wavelength conversion member 50 as in this embodiment, the loss component of the fluorescence Y that cannot be incident on the angle conversion member 52 due to total reflection can be reduced. From this viewpoint, it is desirable to match the refractive index of the angle conversion member 52 and the refractive index of the wavelength conversion member 50 as much as possible.

[0077] A compound parabolic concentrator (CPC) may be used as the angle conversion member 52 instead of the tapered rod. Even when a CPC is used as the angle conversion member 52, the same effect as when a tapered rod is used can be obtained. Note that the light source device 100 does not necessarily have to include the angle conversion member 52.

[0078] A collimating optical system 73 consisting of a collimator lens or the like is provided between the light source device 100 and the integrator optical system 70. The collimating optical system 73 further narrows the angular distribution of the fluorescence Y emitted from the angle conversion member 52, and causes the highly parallel fluorescence Y to be incident on the integrator optical system 70. Note that the collimating optical system 73 does not need to be provided when the parallelism of the fluorescence Y emitted from the angle conversion member 52 is sufficiently high.

[0079] The integrator optical system 70 has a first lens array 71 and a second lens array 72. The integrator optical system 70, together with the superimposing optical system 103, functions as a uniform illumination optical system that uniformizes the intensity distribution of the fluorescence Y emitted from the light source device 100 in each of the light modulation devices 4R and 4G, which are the illuminated regions. The fluorescence Y emitted from the collimating optical system 73 is incident on the first lens array 71. The first lens array 71, together with the second lens array 72 provided downstream of the light source device 100, constitutes the integrator optical system 70.

[0080] The first lens array 71 has a plurality of first small lenses 71a. The plurality of first small lenses 71a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20. The plurality of first small lenses 71a split the fluorescence Y emitted from the angle conversion member 52 into a plurality of partial light beams. The shape of each of the first small lenses 71a is a rectangle that is approximately similar to the shape of the image forming areas of the light modulation devices 4R and 4G. As a result, each of the partial light beams emitted from the first lens array 71 is efficiently incident on the image forming areas of the light modulation devices 4R and 4G.

[0081] The fluorescence Y emitted from the first lens array 71 travels toward the second lens array 72. The second lens array 72 is disposed opposite to the first lens array 71. The second lens array 72 has a plurality of second small lenses 72a corresponding to the plurality of first small lenses 71a of the first lens array 71. The second lens array 72, together with the superimposing optical system 103, forms each of the images of the plurality of first small lenses 71a of the first lens array 71 in the vicinity of the image forming areas of the light modulation devices 4R, 4G. The plurality of second small lenses 72a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20.

[0082] In this embodiment, the first small lenses 71a of the first lens array 71 and the second small lenses 72a of the second lens array 72 have the same size, but may have different sizes. Also, in this embodiment, the first small lenses 71a of the first lens array 71 and the second small lenses 72a of the second lens array 72 are arranged at positions where their optical axes coincide with each other, but may be arranged in an eccentric state with respect to each other.

[0083] The polarization conversion element 102 converts the polarization direction of the fluorescence Y emitted from the second lens array 72. Specifically, the polarization conversion element 102 converts each partial light beam of the fluorescence Y split by the first lens array 71 and emitted from the second lens array 72 into linearly polarized light.

[0084] The polarization conversion element 102 has a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the fluorescence Y emitted from the light source device 100 as is and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1, a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1, and a phase difference plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

[0085] FIG. 5 is a cross-sectional view of the light source device 100 taken along the line VV in FIG. 5, surface 58a of holding member 58 is located above (on the -Y side) of first surface 50a of wavelength conversion member 50 held in groove portion 59. For this reason, fixing member 64 abutting surface 58a of holding member 58 does not come into contact with first surface 50a of wavelength conversion member 50. First pressing member 90 abuts against first surface 50a of wavelength conversion member 50 by being disposed in slit-shaped recess 58a1 shown in FIG. 4 provided on surface 58a of holding member 58.

[0086] The groove portion 59 of the holding member 58 has a U-shaped cross section perpendicular to the X-axis direction, and is elongated in the X-axis direction. The groove portion 59 includes a support surface 59s that supports the second surface 50b of the wavelength conversion member 50, and a first side wall surface 59a and a second side wall surface 59b that intersect with the support surface 59s. The supporting surface 59s is a surface that extends parallel to the XZ plane and constitutes the bottom surface of the groove portion 59 that holds the wavelength conversion member 50. The supporting surface 59s supports the second surface 50b of the wavelength conversion member 50. The first side wall surface 59a and the second side wall surface 59b are flat surfaces that extend along the XY plane and face in opposite directions to each other.

[0087] The first side wall surface 59a corresponds to one side surface of the groove portion 59, faces the third surface 50c of the wavelength conversion member 50, and is spaced apart from the third surface 50c. That is, a gap is provided between the first side wall surface 59a and the third surface 50c of the wavelength conversion member 50. The second side wall surface 59b corresponds to the other side surface of the groove portion 59, faces the fourth surface 50d of the wavelength conversion member 50, and is spaced apart from the fourth surface 50d. That is, a gap is provided between the second side wall surface 59b and the fourth surface 50d of the wavelength conversion member 50.

[0088] The first side wall surface 59a has a first portion 59a1 located on the first surface 50a side and a second portion 59a2 located on the support surface 59s side. The first portion 59a1 extends in a direction perpendicular to the support surface 59s, i.e., parallel to the XY plane. The second portion 59a2 inclines so as to approach the third surface 50c from the first portion 59a1 side toward the support surface 59s side. In other words, the distance between the second portion 59a2 on the support surface 59s side and the third surface 50c is smaller than the distance between the second portion 59a2 on the first portion 59a1 side and the fifth surface 50e.

[0089] The second side wall surface 59b has a third portion 59b1 located on the first surface 50a side and a fourth portion 59b2 located on the support surface 59s side. The third portion 59b1 extends in a direction perpendicular to the support surface 59s, i.e., parallel to the XY plane. The fourth portion 59b2 is inclined so as to approach the fourth surface 50d from the third portion 59b1 side toward the support surface 59s side. In other words, the distance between the fourth portion 59b2 on the support surface 59s side and the fourth surface 50d is smaller than the distance between the fourth portion 59b2 on the third portion 59b1 side and the fourth surface 50d.

[0090] The first side wall surface 59a, the second side wall surface 59b, and the support surface 59s constituting the inner surface of the groove portion 59 are made of the surface of an aluminum alloy, which is the constituent material of the holding member 58. More specifically, the first side wall surface 59a, the second side wall surface 59b, and the support surface 59s are each made of a processed surface that has been subjected to mirror finishing on the above-mentioned aluminum alloy surface. Therefore, the first side wall surface 59a, the second side wall surface 59b, and the support surface 59s each have light reflectivity and reflect the incident excitation light E. Note that the first side wall surface 59a, the second side wall surface 59b, and the support surface 59s may each be made of another metal film or a dielectric multilayer film formed on the aluminum alloy surface.

[0091] Since the first side wall surface 59a and the second side wall surface 59b of the groove portion 59 need to be mirror-finished as described above, high processing accuracy is required for the holding member 58 that forms the groove portion 59. In the light source device 100 of the present embodiment, since the holding member 58 is a separate part from the base member 60 as described above, it is possible to easily improve the processability and processing accuracy of the first side wall surface 59a and the second side wall surface 59b of the groove portion 59.

[0092] A dimension W1 along the Z-axis direction of the light-emitting surface 56a of the light-emitting element 56 is larger than a width B2 along the Z-axis direction of the wavelength conversion member 50. Note that the width along the Z-axis direction of the wavelength conversion member 50 in this embodiment is uniform over the entire longitudinal direction. As a result, in the Z-axis direction, both ends of the light-emitting surface 56a of the light-emitting element 56 protrude outside the third surface 50c of the wavelength conversion member 50. Specifically, both ends of the light-emitting surface 56a of the light-emitting element 56 protrude to positions overlapping the gap between the third surface 50c and the first side wall surface 59a and the gap between the fourth surface 50d and the second side wall surface 59b. In other words, when the light-emitting surface 56a is viewed along the Y-axis direction from the support surface 59s, a part of the light-emitting surface 56a overlaps with the first surface 50a, and another part of the light-emitting surface 56a overlaps with the gap between the third surface 50c and the first side wall surface 59a and the gap between the fourth surface 50d and the second side wall surface 59b.

[0093] A first width D2 of the support surface 59s of the groove portion 59 along the Z-axis direction is larger than a width B2 of the wavelength conversion member 50 along the Z-axis direction. As a result, both ends of the support surface 59s protrude outside the second surface 50b of the wavelength conversion member 50 in the Z-axis direction. In other words, when the support surface 59s is viewed from the light-emitting surface 56a along the Y-axis direction, a part of the support surface 59s overlaps with the second surface 50b, and another part of the support surface 59s is exposed outside the second surface 50b. In this way, the support surface 59s has an exposed portion 59r exposed to the outside of the wavelength conversion member 50.

[0094] In the light source device 100 of this embodiment, a part of the excitation light E2 emitted from the light emitting surface 56a of the light emitting element 56 passes through the gap between the third surface 50c of the wavelength conversion member 50 and the first portion 59a1, and then enters the second portion 59a2 inclined with respect to the support surface 59s. At this time, the excitation light E2 is reflected by the second portion 59a2 and enters the third surface 50c of the wavelength conversion member 50. In this way, the excitation light E2 passing through the gap between the third surface 50c of the wavelength conversion member 50 and the first side wall surface 59a is easily entered into the third surface 50c, so that the amount of the excitation light E reflected by the support surface 59s and returning to the side of the first light source unit 51 can be reduced. In addition, a part of the excitation light E is reflected by the first portion 59a1 extending perpendicularly to the support surface 59s and enters the third surface 50c of the wavelength conversion member 50. Similarly, the excitation light E that enters between the fourth surface 50d of the wavelength conversion member 50 and the second side wall surface 59b is reflected by the third portion 59b1 or the fourth portion 59b2 and enters the fourth surface 50d of the wavelength conversion member 50. As described above, according to the light source device 100 of this embodiment, the utilization efficiency of the excitation light E is high, and it is possible to obtain fluorescent light Y having a desired intensity.

[0095] As described above, the light source device 100 of this embodiment includes the light emitting element 56 that emits excitation light E, the substrate 55 that supports the light emitting element 56, the wavelength conversion member 50 onto which the excitation light E emitted from the light emitting element 56 is incident, the holding member 58 having a groove portion 59 that holds at least a part of the wavelength conversion member 50, and the base member 60 that is formed as a separate member from the holding member 58 and fixes the substrate 55. The holding member 58 is supported by the base member 60.

[0096] According to the light source device 100 of the present embodiment, the holding member 58 and the base member 60 are formed as separate members, and therefore the processing precision required for the grooves 59 of the holding member 58 differs from the processing precision required for the base member 60. Therefore, the yield of the holding member 58 does not affect the yield of the base member 60, and a decrease in the yield of the entire device can be suppressed. Therefore, the light source device 100 of the present embodiment allows the optimum materials and processing accuracy for the holding member 58 and the base member 60 to be selected, thereby enabling cost reduction. Furthermore, in the light source device 100 of this embodiment, a material with excellent thermal conductivity can be used for the holding member 58 that holds the wavelength conversion member 50, so that the cooling performance of the wavelength conversion member 50 can be improved. Furthermore, since the groove portion 59 that holds the wavelength conversion member 50 has a large surface area, the second surface 50b of the wavelength conversion member 50 is held in the groove portion 59 in a state of good contact with the support surface 59s. Therefore, heat generated in the wavelength conversion member 50 is efficiently transferred to the holding member 58 via the support surface 59s. Therefore, the light source device 100 of this embodiment can further improve the heat dissipation of the wavelength conversion member 50, so that bright fluorescence Y can be emitted from the wavelength conversion member 50.

[0097] The projector 1 of the present embodiment includes a light source device 100 that generates bright fluorescent light Y produced by selecting optimal materials and processing accuracy, and therefore a projector with excellent light utilization efficiency can be realized at low cost.

[0098] Second embodiment The light source device of the second embodiment will be described below. The difference between this embodiment and the first embodiment is the support structure of the holding member in the base member. The support structure will be mainly described below, and the same reference numerals will be used for the members common to the first embodiment, and the description will be omitted or simplified.

[0099] Fig. 6 is an exploded perspective view showing the main configuration of a light source device 101 of this embodiment. In Fig. 6, in order to make the drawing easier to see, a light source unit that is not relevant to the description is omitted. As shown in FIG. 6, in the light source device 101 of this embodiment, the base member 160 has a surface 160a for fixing the substrate 55 of the first light source unit 51, a back surface 160b facing away from the surface 160a, a through hole 161 penetrating the surface 160a and the back surface 160b, and a notch portion 162 provided in the surface 160a and communicating with the through hole 161.

[0100] The light source device 101 of this embodiment further includes a heat dissipation member 165 arranged on the back surface 160b side of the base member 160. The heat dissipation member 165 constitutes a heat sink having a heat dissipation substrate 166 and a plurality of heat dissipation fins 167. The heat dissipation substrate 166 is made of a metal substrate having excellent heat dissipation properties, such as aluminum or copper. The heat dissipation substrate 166 has the same outer shape as the base member 160, and is joined to the back surface 160b of the base member 160. The plurality of heat dissipation fins 167 are provided on the surface of the heat dissipation substrate 166 opposite to the base member 160. The heat dissipation member 165 and the rear surface 160b of the base member 160 may be in direct contact with each other, or may be indirectly in contact with each other via a thermally conductive adhesive or thermally conductive beads.

[0101] The holding member 158 of this embodiment is supported by a through hole 161 of a base member 160. The holding member 158 is inserted into the through hole 161, and a first side surface 158c and a second side surface 158d perpendicular to the front surface 158a and the back surface 158b are in contact with the inner wall surface of the through hole 161. This increases the contact area between the holding member 158 and the base member 160, and therefore the cooling performance of the wavelength conversion member 50 can be improved by dissipating heat from the holding member 158 to the base member 160 side. Incidentally, a thermally conductive adhesive or a thermally conductive filler may be disposed between the first side surface 158c and the second side surface 158d and the inner wall surface of the through hole 161 to efficiently transfer heat from the holding member 158 to the base member 160 side.

[0102] The holding member 158 has a protrusion 159 fixed to the cutout portion 162. The protrusions 159 are arranged on both sides in the Z-axis direction of the groove portion 59 of the holding member 158. Specifically, the protrusions 159 are provided in pairs at the -Y side ends of a first side surface 158c and a second side surface 158d that are perpendicular to the front surface 158a and the back surface 158b of the holding member 158. Therefore, the holding member 158 has a total of four protrusions 159.

[0103] In the case of this embodiment, convex portion 159 is fixed by fitting into notch portion 162 from the -Y side toward the +Y side. As a result, holding member 158 is fixed to base member 160 while being supported by through hole 161. Note that the method of fixing convex portion 159 to notch portion 162 is not limited to fitting, and may be adhesive or screw fixing.

[0104] In a state where the convex portion 159 is fixed to the notch portion 162, the back surface 158b of the holding member 158 is exposed on the back surface 160b side of the base member 160. In the case of this embodiment, the back surface 158b of the holding member 158 is flush with the back surface 160b of the base member 160. The heat dissipation member 165 is thermally connected to the back surface 158b of the holding member 158 supported by the through hole 161 and exposed on the back surface 160b side. Here, the heat dissipation member 165 and the back surface 158b of the holding member 158 being thermally connected may be in direct contact with the heat dissipation member 165 and the back surface 158b as long as the heat is conductive between the heat dissipation member 165 and the back surface 158b, or a heat conductive adhesive or heat conductive beads may be disposed between the heat dissipation member 165 and the back surface 158b.

[0105] According to light source device 101 of this embodiment, as in the first embodiment, the optimal material and processing accuracy can be selected for holding member 158 and base member 160, so that costs can be reduced. Also, by fixing convex portion 159 of holding member 158 to notch portion 162, holding member 158 and base member 160 can be easily fixed together. Also, since heat dissipation member 165 thermally connected to holding member 58 is provided, heat from holding member 58 can be efficiently dissipated. Therefore, bright fluorescence Y can be generated by increasing the cooling efficiency of wavelength conversion member 50.

[0106] In the present embodiment, the case has been described in which the holding member 158 and the base member 160 are fixed by fixing the convex portion 159 to the cutout portion 162, but the holding member 158 exposed on the back surface 160b side of the base member 160 via the through hole 161 may be fixed to the heat dissipation member 165. With this configuration, the convex portion 159 and the cutout portion 162 are not necessary, so that the configuration of the holding member 158 and the configuration around the groove portion 59 of the base member 160 can be simplified.

[0107] 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. For example, the wavelength conversion member 50 in the above embodiment is configured in the shape of a rectangular prism having six faces extending along the X-axis, and the angle conversion member 52 is provided on the fifth face 50e, which is the light exit portion; however, the angle conversion member 52 may be omitted by integrally forming a rectangular truncated pyramid-shaped light exit portion at the end of the wavelength conversion member 50 on the light exit side.

[0108] In the above embodiment, the first side wall surface 59a and the second side wall surface 59b of the groove portion 59 are spaced apart from the third surface 50c and the fourth surface 50d of the wavelength conversion member 50, but the third surface 50c or the fourth surface 50d of the wavelength conversion member 50 may abut against the first side wall surface 59a or the second side wall surface 59b. With this configuration, the contact area between the wavelength conversion member and the holding member increases, thereby further improving the heat dissipation of the wavelength conversion member.

[0109] In the above embodiment, the first side wall surface 59a and the second side wall surface 59b of the groove portion 59 have a portion perpendicular to the support surface 59s and a portion inclined to the support surface 59s, but the shape of the groove portion 59 is not particularly limited, and for example, the entire area of ​​the wall surface of the groove portion may be perpendicular to the support surface. Also, the wall surface of the groove portion may be curved.

[0110] In the above embodiment, the present invention is applied to a light source device equipped with a wavelength conversion member, but instead of this configuration, the present invention may be applied to a light source device that propagates incident light without wavelength conversion, and then controls the angular distribution and emits the light. In this case, the wavelength conversion member in the above embodiment replaces the light guide member, and the light emitted from the light emitting element is emitted from the angle conversion member as light of the same wavelength band.

[0111] In addition, the specific description of the shape, number, arrangement, material, etc. of each component of the light source device and the projector is not limited to the above embodiment and can be changed as appropriate. In addition, in the above embodiment, an example in which the light source device according to the present invention is mounted on a projector using a liquid crystal panel is shown, but this is not limited to this. The light source device according to the present invention may be applied to a projector using a digital micromirror device as a light modulation device. In addition, the projector does not need to have multiple light modulation devices, and may have only one light modulation device.

[0112] In the above embodiment, the wavelength conversion member 50 is pressed against the holding member 58 by two first pressing members 90, but the number of first pressing members 90 is not limited to this. For example, three or more first pressing members 90 may be provided if the amount of excitation light E incident on the wavelength conversion member 50 from the light emitting element 56 can be ensured.

[0113] In the above embodiment, the light source device of the present invention is applied to a projector, but the present invention is not limited to this. The light source device of the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

[0114] The following is a summary of this disclosure. (Appendix 1) A light emitting element that emits light; A substrate supporting the light emitting element; a light guiding member into which the light emitted from the light emitting element is incident; a holding member having a groove portion for holding at least a portion of the light guide member; a base member that is separate from the holding member and that fixes the substrate; Equipped with The holding member is supported by the base member. Light source device.

[0115] In the light source device having this configuration, the holding member and the base member are made of separate members, so the processing precision required for the grooves of the holding member is different from that required for the base member, and therefore the yield of the holding member does not affect the yield of the base member, thereby preventing a decrease in the yield of the entire device. Therefore, the light source device having this configuration can reduce costs by making it possible to select optimal materials and processing precision for the holding member and base member. In addition, in the light source device of this configuration, a material with excellent thermal conductivity can be used as the holding member that holds the light guide member, so the cooling performance of the light guide member can be improved. Also, since the groove that holds the light guide member has a large surface area, the light guide member and the support surface of the groove are in good contact with each other, so the heat of the light guide member is efficiently transferred to the holding member. Therefore, the light source device of this configuration can further improve the heat dissipation of the light guide member, so that bright light can be emitted from the light guide member.

[0116] (Appendix 2) At least a part of an inner surface of the groove portion reflects the light emitted from the light-emitting element toward the light-guiding member. 2. A light source device as described in claim 1.

[0117] According to this configuration, the light emitted from the light emitting element can be efficiently incident on the light guide member, thereby further improving the light utilization efficiency.

[0118] (Appendix 3) the light guiding member further includes a first surface onto which the light is incident, a second surface facing away from the first surface, a third surface and a fourth surface intersecting the first surface and the second surface and facing away from each other, and a light exit portion that exits the light, the groove portion has a support surface facing the second surface, a first side wall surface facing the third surface and spaced apart from the third surface, and a second side wall surface facing the fourth surface and spaced apart from the fourth surface, the first side wall surface has a first portion located on the first surface side and a second portion located on the support surface side, the first portion extends in a direction perpendicular to the support surface, and the second portion is inclined so as to approach the third surface from the first portion side toward the support surface side, the second side wall surface has a third portion located on the first surface side and a fourth portion located on the support surface side, the third portion extends in a direction perpendicular to the support surface, and the fourth portion is inclined so as to approach the fourth surface from the third portion side toward the support surface side, the first portion, the second portion, the third portion, and the fourth portion reflect at least a portion of the light. 3. A light source device as described in claim 2.

[0119] According to this configuration, a portion of the light emitted from the light-emitting element travels through the gap between the third surface and the first portion of the light-guiding member, and then enters the second portion inclined with respect to the support surface. At this time, the light is reflected at the second portion and enters the third surface of the light-guiding member. In this way, the light passing through the gap between the third surface and the first wall surface of the light-guiding member is more likely to enter the third surface, so that the amount of light reflected at the support surface and returning to the light-emitting element can be reduced. In addition, a portion of the light is reflected at the first portion extending perpendicularly to the support surface and enters the third surface of the light-guiding member. Similarly, a portion of the light emitted from the light-emitting element travels through the gap between the fourth surface and the third portion of the light-guiding member, and then enters the fourth portion inclined with respect to the support surface. At this time, the light is reflected at the fourth portion and enters the fourth surface of the light-guiding member. In this way, the light passing through the gap between the fourth surface of the light-guiding member and the second wall surface is more likely to enter the fourth surface, so that the amount of light reflected at the support surface and returning to the light-emitting element can be reduced. In addition, a portion of the light is reflected at the third portion extending perpendicularly to the support surface and enters the fourth surface of the light-guiding member. Therefore, a light source device that has high light utilization efficiency and can easily obtain light having a desired intensity can be realized.

[0120] (Appendix 4) The base member has a recess for supporting the holding member. 4. A light source device according to claim 1.

[0121] According to this configuration, by disposing the holding member in the recess, it becomes easy to align the holding member with the base member.

[0122] (Appendix 5) The thermal conductivity of the holding member is higher than the thermal conductivity of the base member. 5. A light source device according to any one of claims 1 to 4.

[0123] According to this configuration, heat can be efficiently dissipated from the light guide member held by the holding member.

[0124] (Appendix 6) The holding member is supported by the base member via a thermally conductive member. 6. A light source device according to any one of claims 1 to 5.

[0125] According to this configuration, heat from the holding member is efficiently dissipated to the base member side via the thermally conductive member, so that the cooling performance of the light guide member can be improved.

[0126] (Appendix 7) the base member has a surface to which the substrate is fixed, a back surface facing away from the surface, and a through hole penetrating the surface and the back surface; The holding member is supported in the through hole of the base member. 7. A light source device according to any one of claims 1 to 6.

[0127] According to this configuration, the contact area between the holding member and the base member is increased, so that the heat of the holding member can be dissipated to the base member side, thereby improving the cooling performance of the light guide member.

[0128] (Appendix 8) a heat dissipation member disposed on the back surface side of the base member, the heat dissipation member is supported in the through hole and thermally connected to the holding member exposed on the back surface side; 8. A light source device according to any one of claims 1 to 7.

[0129] According to this configuration, since the heat dissipation member is provided which is thermally connected to the holding member, the heat of the holding member can be efficiently dissipated, and therefore the cooling efficiency of the light guide member can be improved, thereby generating bright light.

[0130] (Appendix 9) the base member further has a notch provided on the surface thereof and communicating with the through hole, The holding member has a protrusion fixed to the notch portion. 9. A light source device according to any one of claims 1 to 8.

[0131] According to this configuration, by fixing the convex portion of the holding member to the cutout portion, the holding member and the base member can be easily fixed to each other.

[0132] (Appendix 10) the light emitting element emits a first light having a first wavelength band; The light guide member is a wavelength conversion member that includes a phosphor, 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 emits the second light. 10. A light source device according to any one of claims 1 to 9.

[0133] According to this configuration, since the wavelength conversion member is efficiently cooled, a light source device that obtains the second light having a desired intensity can be realized at low cost.

[0134] (Appendix 11) A light source device according to any one of claims 1 to 10; a light modulation device that modulates the light emitted from the light source device in accordance with image information; a projection optical device that projects the light modulated by the light modulation device. projector.

[0135] According to a projector having this configuration, since it is equipped with the light source device that generates bright light by selecting optimal materials and processing accuracy, a projector with excellent light utilization efficiency can be provided at low cost. [Explanation of symbols]

[0136] 1...projector, 4B, 4G, 4R...light modulation device, 6...projection optical device, 50...wavelength conversion member, 50a...first surface, 160a...surface, 50b...second surface, 50c...third surface, 50d...fourth surface, 55...substrate, 56...light emitting element, 58, 158...holding member, 59...groove portion, 59a...first side wall surface, 59b...second side wall surface, 59s...support surface, 60, 160...base member, 66...thermal conductive member, 100, 101...light source device, 158b...rear surface (of holding member), 159...convex portion, 160b...rear surface (of base member), 161...through hole, 162...cutout portion, 165...heat dissipation member, 59a1...first portion, 59a2...second portion, 59b1...third portion, 59b2...fourth portion, Y...fluorescent.

Claims

1. A light emitting element that emits light; A substrate supporting the light emitting element; a light guiding member into which the light emitted from the light emitting element is incident; a holding member having a groove portion for holding at least a portion of the light guide member; a base member that is separate from the holding member and that fixes the substrate; Equipped with The holding member is supported by the base member. Light source device.

2. At least a part of an inner surface of the groove portion reflects the light emitted from the light-emitting element toward the light-guiding member. The light source device according to claim 1 .

3. the light guiding member further includes a first surface to which the light is incident, a second surface facing away from the first surface, a third surface and a fourth surface intersecting the first surface and the second surface and facing away from each other, and a light exit portion that exits the light, the groove portion has a support surface facing the second surface, a first side wall surface facing the third surface and spaced apart from the third surface, and a second side wall surface facing the fourth surface and spaced apart from the fourth surface, the first side wall surface has a first portion located on the first surface side and a second portion located on the support surface side, the first portion extends in a direction perpendicular to the support surface, and the second portion is inclined so as to approach the third surface from the first portion side toward the support surface side, the second side wall surface has a third portion located on the first surface side and a fourth portion located on the support surface side, the third portion extends in a direction perpendicular to the support surface, and the fourth portion is inclined so as to approach the fourth surface from the third portion side toward the support surface side, the first portion, the second portion, the third portion, and the fourth portion reflect at least a portion of the light; The light source device according to claim 2 .

4. The base member has a recess for supporting the holding member. The light source device according to claim 1 .

5. The thermal conductivity of the holding member is higher than the thermal conductivity of the base member. The light source device according to claim 1 .

6. The holding member is supported by the base member via a thermally conductive member. The light source device according to claim 1 .

7. the base member has a surface to which the substrate is fixed, a back surface facing away from the surface, and a through hole penetrating the surface and the back surface; The holding member is supported in the through hole of the base member. The light source device according to claim 1 .

8. a heat dissipation member disposed on the back surface side of the base member, the heat dissipation member is supported in the through hole and thermally connected to the holding member exposed on the back surface side; The light source device according to claim 7.

9. the base member further has a notch provided on the surface thereof and communicating with the through hole, The holding member has a protrusion fixed to the notch portion. The light source device according to claim 7.

10. the light-emitting element emits a first light having a first wavelength band; The light guide member is a wavelength conversion member that includes a phosphor, 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 emits the second light. The light source device according to claim 1 .

11. A light source device according to any one of claims 1 to 10, a light modulation device that modulates the light emitted from the light source device; a projection optical device that projects the light modulated by the light modulation device. projector.

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