Light source device and projector

Abstract

To provide a light source device and a projector capable of achieving miniaturization while enhancing the degree of freedom of layout.SOLUTION: A light source device includes: a light source part which includes a base substrate, a first light emitting element group and a second light emitting element group arranged on the base substrate having a gap, and a first connection part provided in the gap and for electrically connecting the first light emitting group and the second light emitting group; a light guide member which guides the light emitted from the light source part; a support member which supports the light guide member, and on which the base substrate of the light source part is fixed; and a first restriction member which is arranged between the light guide member and the base substrate, and which restricts the position of the light guide member with respect to the support member. The first light emitting element group has a constitution in which a plurality of first light emitting elements is connected in series so that an electric current flows along a first direction. The second light emitting element group has a constitution in which a plurality of second light emitting elements is connected in series so that an electric current flows along a second direction opposite to the first direction. The first restriction member is arranged so as to be overlapped with the first connection part.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] As a light source device for use in a projector, a light source device that utilizes fluorescence emitted from a phosphor when the phosphor is irradiated with excitation light emitted from a light-emitting element has been proposed. The following Patent Document 1 discloses a light source device that includes an excitation light source having a plurality of light-emitting elements mounted on a circuit board, a phosphor rod that converts the excitation light emitted from each light-emitting element of the excitation light source into fluorescence, a holder that holds the phosphor rod, and a pressing member that presses the phosphor rod against the holder.

[0003] In the light source device, the plurality of light emitting elements are arranged in a row on a circuit board. Patent Document 2 listed below discloses a technique for connecting a plurality of LED elements in series on a circuit board. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 254455 [Patent Document 2] JP 2011-091256 A Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, it is conceivable to connect a plurality of light-emitting elements in series on a circuit board by combining the technology of the above Patent Document 2 with the light source device of the above Patent Document 1. In such a configuration in which a plurality of light-emitting elements are connected in series, the circuit board is likely to become large in size, and there is a problem that the degree of freedom in the location of the pressing member is low because it is necessary to place the pressing member at a position that does not overlap the light-emitting element in a plan view so that the pressing member does not block the light emitted from the light-emitting element. [Means for solving the problem]

[0006] In order to solve the above problems, a light source device of one embodiment of the present invention comprises a light source unit having a base substrate, a first group of light-emitting elements and a second group of light-emitting elements arranged on the base substrate with a gap therebetween, and a first connection portion arranged in the gap and electrically connecting the first group of light-emitting elements and the second group of light-emitting elements, a light-guiding member that guides light emitted from the light source unit, a support member that supports the light-guiding member and to which the base substrate of the light source unit is fixed, and a regulating member that is arranged between the light-guiding member and the base substrate and regulates the position of the light-guiding member relative to the support member, wherein the first group of light-emitting elements has a configuration in which a plurality of first light-emitting elements are connected in series so that a current flows along a first direction, and the second group of light-emitting elements has a configuration in which a plurality of second light-emitting elements are connected in series so that a current flows along a second direction opposite to the first direction, and when viewed in a planar state, the regulating member is arranged to overlap the first connection portion in the gap.

[0007] A projector of one embodiment of the present invention comprises a light source device of one embodiment of the present invention, a light modulation device that modulates 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. [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. 2 is a plan view showing a schematic configuration of a light source unit. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. 3. [Diagram 5] FIG. 2 is a plan view showing a circuit configuration of a light source unit. [Figure 6] 4 is an enlarged view showing the configuration of the main parts of a first light-emitting element group and a second light-emitting element group. FIG. [Figure 7]4 is a plan view of the light source device as viewed from the Y-axis direction. FIG. [Figure 8] 8 is a cross-sectional view of the light source device taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 11 is a plan view showing a configuration of a main part of a light source device according to a first modified example. [Figure 10] FIG. 13 is a diagram showing a configuration of a main part of a light source device according to a second modified example. 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 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 top and bottom 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 direction along the X axis is called the +X direction, and the opposite direction is called the -X direction, one direction along the Y axis is called the +Y direction, and the opposite direction is called the -Y direction, one direction along the Z axis is called the +Z direction, and the opposite direction is called the -Z direction. In addition, the two directions along the X-axis will not be distinguished from one another and will be collectively referred to as the X-axis direction, the two directions along the Y-axis will not be distinguished from one another and will be collectively referred to as the Y-axis direction, and the two directions along the Z-axis will not be distinguished from one another and will be collectively referred to as the Z-axis direction.

[0014] In this embodiment, the "+X direction" corresponds to the "first direction" in the claims, and the "-X direction" corresponds to the "second direction" in the claims. The +Z direction or the -Z direction corresponds to the "direction intersecting the first direction" in the claims.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] The second illumination device 21 includes a second light source 81, a condenser lens 82, a diffusion plate 83, a rod lens 84, and a relay lens 85. The second light source 81 is composed of at least one semiconductor laser. The second light source 81 emits blue light LB composed of a laser beam. The second light source 81 is not limited to a semiconductor laser, and may be composed of an LED that emits blue light.

[0019] 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 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.

[0020] The blue light LB diffused by the diffusion plate 83 is incident on the rod lens 84. The rod lens 84 has a prismatic shape extending along the optical axis AX2 direction of the second illumination device 21. The rod lens 84 has a light incident end surface 84a provided at one end and a light exit end surface 84b provided at the other end. The diffusion plate 83 is fixed to the light incident end surface 84a of the rod lens 84 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 84 as closely as possible.

[0021] The blue light LB is propagated while being totally reflected inside the rod lens 84, and is emitted from the light emitting end surface 84b with the uniformity of the illuminance distribution being enhanced. The blue light LB emitted from the rod lens 84 is incident on the relay lens 85. The relay lens 85 causes the blue light LB, whose uniformity of the illuminance distribution has been enhanced by the rod lens 84, to be incident on the reflecting mirror 9.

[0022] The shape of the light exit end surface 84b of the rod lens 84 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 84 to efficiently enter the image forming area of ​​the light modulation device 4B.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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, a collimating optical system 63, an integrator optical system 80, a polarization conversion element 102, and a superimposing optical system 103.

[0029] The light source device 100 includes a wavelength conversion member 50, a light source unit 70, an angle conversion member 52, a mirror 53, a support member 54, a holding member 65, and a pair of pressing members 91 and 92. The wavelength conversion member 50 of the present embodiment corresponds to the "light guiding member" in the claims.

[0030] 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.

[0031] The wavelength conversion member 50 has a first surface 50a, a second surface 50b, a third surface 50c, a fourth surface 50d, a fifth surface 50e, and a sixth surface 50f. The first surface 50a and the second surface 50b intersect with the X-axis along the longitudinal direction of the wavelength conversion member 50 and are located on opposite sides of the X-axis. In this embodiment, the first surface 50a is located on the +X side, which is one side of the X-axis direction along the X-axis, and the second surface 50b is located on the -X side, which is the opposite direction of the X-axis direction.

[0032] 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 along the longitudinal direction of the wavelength conversion member 50, and are located on opposite sides to each other along the Y-axis which is perpendicular in this embodiment. In this embodiment, the third surface 50c is located on the -Y side which is one side of the Y-axis direction along the Y-axis, and the fourth surface 50d is located on the +Y side which is the other side of the Y-axis direction.

[0033] The fifth surface 50e and the sixth surface 50f intersect with the third surface 50c and the fourth surface 50d, and intersect with the X-axis and the Y-axis, and are located on opposite sides of the Z-axis, which is perpendicular to the X-axis and the Y-axis in this embodiment. In this embodiment, the fifth surface 50e is located in the +Z direction, which is one side of the Z-axis direction, and the sixth surface 50f is located in the -Z direction, which is the other side of the Z-axis direction.

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

[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 source unit 70 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 third surface 50c. The fluorescence Y is guided inside the wavelength conversion member 50 and then emitted from the first surface 50a. The excitation light E in this embodiment corresponds to the "first light" in the claims. The fluorescence Y in this embodiment corresponds to the "second light" 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, which contains cerium (Ce) as an activator, as an example, the material of the wavelength conversion member 50 includes YAG:Ce, which contains cerium (Ce) as an activator. 2 O 3 , Al 2 O 3 , CEO 3 Materials that can be used include those obtained by mixing raw material powders containing the above-mentioned constituent elements and subjecting them to a solid-phase reaction; Y-Al-O amorphous particles obtained by wet processes such as the coprecipitation method and the sol-gel method; and YAG particles obtained by gas-phase processes such as the spray drying method, the flame pyrolysis method, and the thermal plasma method.

[0039] The light source unit 70 includes a base substrate 71 and a plurality of light emitting element groups 72. The base substrate 71 includes a first surface 71a and a second surface 71b opposite to the first surface 71a. The base substrate 71 has a structure in which a plurality of layers are stacked, as described below. The plurality of light-emitting element groups 72 are provided on a first surface 71a of the base substrate 71. The light source unit 70 of the present embodiment has the plurality of light-emitting element groups 72, but the number of the light-emitting element groups 72 is not particularly limited.

[0040] In this embodiment, the plurality of light emitting element groups 72 include a first light emitting element group 72A, a second light emitting element group 72B, a third light emitting element group 72C, and a fourth light emitting element group 72D. A detailed configuration of each of the light emitting element groups 72A, 72B, 72C, and 72D will be described later.

[0041] Each of the light emitting element groups 72A, 72B, 72C, and 72D faces the third surface 50c of the wavelength conversion member 50, and emits excitation light E of a first wavelength band toward the third surface 50c. The first wavelength band is, for example, a wavelength band from blue to violet of 400 nm to 480 nm, and has a peak wavelength of, for example, 445 nm. In this manner, the light source section 70 is provided to face the third surface 50c, which is one of the four side surfaces 50c, 50d, 50e, and 50f of the wavelength conversion member 50 along the longitudinal direction.

[0042] Fig. 3 is a plan view showing a schematic configuration of the light source section 70. Fig. 3 is a plan view of a first surface 71a of a base substrate 71 of the light source section 70. 3, the base substrate 71 has a substantially rectangular shape. The light-emitting element groups 72A, 72B, 72C, and 72D are arranged on a first surface 71a of the base substrate 71. The base substrate 71 further includes a wiring group 74, a terminal portion 77 electrically connected to the light-emitting element groups 72A, 72B, 72C, and 72D via the wiring group 74, a connector portion 78 electrically connected to the terminal portion 77, a fixing portion 79, a recess 60, a first electronic component 66, and a second electronic component 67.

[0043] The first light-emitting element group 72A and the second light-emitting element group 72B are disposed on the base substrate 71 with a gap S1 therebetween. The third light-emitting element group 72C and the fourth light-emitting element group 72D are disposed on the base substrate 71 with a gap S2 therebetween. Therefore, since no light-emitting elements of any of the light-emitting element groups are disposed in the gaps S1 and S2, no excitation light is emitted from the gaps S1 and S2.

[0044] The terminal portion 77 includes a plurality of first terminals 77a and a plurality of second terminals 77b. The first terminals 77a are terminals into which a current flows from an external device. The second terminals 77b are terminals connected to the ground pattern GP of the base substrate 71 and are connected to the ground potential of the external device. The terminal portion 77 is arranged in the -Z direction, which is one side of the Z-axis direction intersecting with the X-axis direction in which the light-emitting element groups 72A, 72B, 72C, and 72D are arranged on the base substrate 71.

[0045] The connector portion 78 electrically connects the external device to the light source portion 70. The connector portion 78 includes a terminal that connects the terminal portion 77 to the external device. The connector portion 78 supplies current supplied from the external device via the terminal portion 77 and the wiring group 74 to each of the light emitting element groups 72A, 72B, 72C, and 72D. The fixing portion 79 is a portion for fixing the base substrate 71 of the light source portion 70 to the support member 54 described below. The fixing portion 79 fixes the base substrate 71 to the support member 54 via screw members. The fixing portion 79 is composed of a plurality of through holes for inserting screws, four through holes 79a in this embodiment. A protrusion provided on the support member 54 is inserted into the recess 60 when the base substrate 71 is fixed to the support member 54. The first electronic component 66 is, for example, a thermistor. The second electronic component 67 is, for example, a varistor.

[0046] The fixing portion 79 is provided on the outer periphery of the base substrate 71. Specifically, the four through holes 79a are arranged at the corners of the rectangular base substrate 71. The fixing portion 79 fixes the light source unit 70 and the support member 54 so that the light emitting element groups 72A, 72B, 72C, and 72D provided on the first surface 71a of the base substrate 71 face the wavelength conversion member 50.

[0047] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. As shown in FIG. 4, the base substrate 71 of the light source unit 70 includes a substrate 750 having a front surface 750a and a back surface 750b, a first insulating layer 751 provided on the front surface 750a, which is one side of the substrate 750, a conductive layer 752 laminated on the side of the first insulating layer 751 opposite the substrate 750 and constituting part of the wiring group 74, a second insulating layer 753 laminated on the side of the first insulating layer 751 opposite the substrate 750 so as to cover the conductive layer 752, and a recess 754 provided in the second insulating layer 753.

[0048] The material of the base material 750 is, for example, aluminum, which has excellent heat dissipation properties. The first insulating layer 751 and the second insulating layer 753 are made of resist films. The conductive layer 752 is made of a pattern of gold, copper, aluminum, or the like. The recess 754 is an opening that exposes a part of the first insulating layer 751, and constitutes the recess 60.

[0049] In this embodiment, the second surface 71b of the base substrate 71 means the back surface 750b of the substrate 750, and the first surface 71a of the base substrate 71 means the surface of the layer located at the top of the insulating layers and wiring layers laminated on the surface 750a side of the substrate 750. Therefore, the first surface 71a of the base substrate 71 is not a flat surface, but means a surface including irregularities according to the laminated structure of the insulating layers and wiring layers. Each of the light emitting element groups 72A, 72B, 72C, and 72D is electrically connected to the conductive layer 752 as described later.

[0050] Fig. 5 is a plan view showing the circuit configuration of the light source unit 70. For ease of understanding, Fig. 5 shows a state in which the second insulating layer 753 forming the first surface 71a of the base substrate 71 is removed from the light source unit 70 shown in Fig. 3. 5, the first light-emitting element group 72A has a plurality of first light-emitting elements 31 and a first element conduction portion 41 that electrically connects the first light-emitting elements 31 to each other. In the first light-emitting element group 72A, the plurality of first light-emitting elements 31 have a structure in which they are connected in series via the first element conduction portion 41 such that a current flows along the +X direction.

[0051] The second light-emitting element group 72B has a plurality of second light-emitting elements 32 and a second element conduction section 42 that electrically connects the second light-emitting elements 32. The second light-emitting elements 32 are connected in series via the second element conduction section 42 so that a current flows along the −X direction. In other words, the direction in which a current flows in the first light-emitting element group 72A is opposite to the direction in which a current flows in the second light-emitting element group 72B.

[0052] The third light-emitting element group 72C has a structure that is line-symmetrical with respect to the first light-emitting element group 72A when a central axis 71C that is parallel to the Z axis and passes through the center of the base substrate 71 is used as a reference. Specifically, the third light-emitting element group 72C has a plurality of third light-emitting elements 33 and a third element conductive portion 43, and the plurality of third light-emitting elements 33 are connected in series so that a current flows along the -X direction via the third element conductive portion 43.

[0053] The fourth light-emitting element group 72D has a structure that is line-symmetrical with respect to the second light-emitting element group 72B when the central axis 71C of the base substrate 71 is used as a reference. Specifically, the fourth light-emitting element group 72D has a plurality of fourth light-emitting elements 34 and a fourth element conductive portion 44, and the plurality of fourth light-emitting elements 34 are connected in series so that a current flows along the +X direction via the fourth element conductive portion 44. In other words, the direction of current flow in the third light-emitting element group 72C is opposite to the direction of current flow in the fourth light-emitting element group 72D.

[0054] In this manner, in the light source section 70 of this embodiment, the first light-emitting element group 72A, the second light-emitting element group 72B and the gap S1, and the third light-emitting element group 72C, the fourth light-emitting element group 72D and the gap S2 are arranged linearly symmetrically with respect to the central axis 71C of the base substrate 71.

[0055] The wiring group 74 of the light source section 70 includes a first connection section 75, a second connection section 76, and a ground pattern GP.

[0056] The first connection portion 75 electrically connects the first light-emitting element group 72A and the second light-emitting element group 72B. The second connection portion 76 electrically connects the third light-emitting element group 72C and the fourth light-emitting element group 72D. The third light-emitting element group 72C and the fourth light-emitting element group 72D are not electrically connected to the first light-emitting element group 72A and the second light-emitting element group 72B. In other words, the first connection portion 75 and the second connection portion 76 are not electrically connected to each other.

[0057] The first connection portion 75 is provided in the gap S1 of the base substrate 71, and the second connection portion 76 is provided in the gap S2 of the base substrate 71. The first connecting portion 75 and the second connecting portion 76 have the same configuration. Therefore, the configuration of the first connecting portion 75 will be described below as an example.

[0058] The first connection portion 75 includes a first wiring 11 and a second wiring 12. The first wiring 11 includes a connection portion 11a and a routing portion 11b. The second wiring 12 includes a connection portion 12a and a routing portion 12b. The connection portion 11a in this embodiment corresponds to the "first portion" in the claims, and the connection portion 12a corresponds to the "second portion" in the claims.

[0059] The connection portion 11a extends along the Z direction intersecting with the +X direction and is connected to the -X side of the first light-emitting element group 72A. Specifically, the connection portion 11a is connected to the first element conduction portion 41 of the first light-emitting element group 72A. The wiring portion 11b of the first wiring 11 is wired from the -Z direction of the connection portion 11a along the first light-emitting element group 72A in the X-axis direction and connected to the first terminal 77a of the terminal portion 77.

[0060] The connection portion 12a of the second wiring 12 extends along the connection portion 11a of the first wiring 11 and is connected to the +X side of the second light-emitting element group 72B. Specifically, the connection portion 12a is connected to the second element conduction portion 42 of the second light-emitting element group 72B. The wiring portion 12b of the second wiring 12 is routed from the connection portion 12a along the first light-emitting element group 72A in the +X direction and connected to the +X side of the first light-emitting element group 72A. Specifically, the wiring portion 12b is connected to the first element conduction portion 41 of the first light-emitting element group 72A.

[0061] Fig. 6 is an enlarged view showing the main configuration of the first light-emitting element group 72A and the second light-emitting element group 72B. As shown in Fig. 6, in the first light-emitting element group 72A, the first element conduction portion 41 has a plurality of first conductive patterns 41a.

[0062] Each of the multiple first conductive patterns 41a extends in the Z-axis direction intersecting with the +X direction. The multiple first conductive patterns 41a are provided corresponding to the multiple first light-emitting elements 31, respectively. That is, the number of the first conductive patterns 41a is the same as the number of the first light-emitting elements 31. Each conductive pattern 41a is made of gold, copper, aluminum, or the like, and corresponds to a part of the conductive layer 752 shown in FIG. 4 which forms a part of the wiring group 74.

[0063] The multiple first conductive patterns 41a are patterns separated from one another and all have the same shape. The first conductive patterns 41a adjacent to each other in the X-axis direction are not in contact with each other. The first conductive pattern 41a includes a mounting portion 410 on which the first light-emitting element 31 is mounted, a pair of protruding portions 411 protruding from both sides of the mounting portion 410, a pair of connecting portions 412 connecting the pair of protruding portions 411 and the mounting portion 410, and a pair of conductive portions 413 provided on the +X side of the pair of connecting portions 412 and electrically connected to the first light-emitting element 31 mounted on the adjacent first conductive pattern 41a. Therefore, each of the multiple first conductive patterns 41a has a shape extending on both sides in the Z-axis direction with respect to the corresponding first light-emitting element 31.

[0064] Between the first conductive patterns 41a adjacent to each other in the X-axis direction, each conductive portion 413 protruding from the first conductive pattern 41a on one side (-X side) is disposed so as to enter the recess 412a of the coupling portion 412 of the first conductive pattern 41a on the other side (+X side). As a result, between the adjacent first conductive patterns 41a, each conductive portion 413 of the first conductive pattern 41a on one side (-X side) is disposed near the mounting portion 410 of the first conductive pattern 41a on the other side (+X side).

[0065] Each of the first light emitting elements 31 is formed of, for example, a light emitting diode (LED). The first light-emitting element 31 has a light-emitting surface 31a, two anode electrodes 31b, and one cathode electrode 31c. In the first light-emitting element 31, the light-emitting surface 31a and the two anode electrodes 31b are provided on the front surface facing away from the base substrate 71, and the cathode electrode 31c is provided on the back surface facing the base substrate 71 side opposite to the front surface. Since the first light-emitting element 31 of this embodiment has two anode electrodes 31b sandwiching the light-emitting surface 31a, the current density supplied to the light-emitting surface 31a is stable, and the light-emitting surface 31a can emit light uniformly. Therefore, each first light-emitting element 31 can emit uniform and bright light from the light-emitting surface 31a.

[0066] The light emitting surface 31a of the first light emitting element 31 is a surface that emits the excitation light E. Here, of the two first conductive patterns 41a adjacent to each other in the X-axis direction, the left side (-X side) is referred to as the first conductive pattern 141a, and the right side (+X side) is referred to as the first conductive pattern 241a. In addition, the first light emitting element 31 mounted on the first conductive pattern 141a is referred to as the first light emitting element 131, and the first light emitting element 31 mounted on the first conductive pattern 241a is referred to as the first light emitting element 231.

[0067] The first light emitting element 231 is mounted in a direction such that the cathode electrode 31c is placed on the mounting portion 410 of the first conductive pattern 241a. Between the cathode electrode 31c and the mounting portion 410, for example, a solder layer is provided.

[0068] The first light emitting element 231 mounted on the first conductive pattern 241a is electrically connected to the first conductive pattern 141a located in the -X direction. Specifically, each anode electrode 31b of the first light emitting element 231 is connected to each conductive portion 413 of the first conductive pattern 141a via a metal wire 35. The metal wire 35 is provided by a wire bonding device.

[0069] In this way, the cathode electrode 31c of the first light-emitting element 31 mounted on the first conductive pattern 41a and the anode electrode 31b of the first light-emitting element 131 mounted on the first conductive pattern 141a are brought into an electrically conductive state via the first conductive pattern 41a. Furthermore, between other first light-emitting elements 31 adjacent to each other in the X-axis direction, the cathode electrode 31c of one first light-emitting element 31 and the anode electrode 31b of the other first light-emitting element 31 are electrically connected to each other.

[0070] Among the multiple first conductive patterns 41a arranged in the +X direction, the first conductive pattern 41a located furthest in the -X direction, that is, the first one, is electrically connected to the connection portion 11a of the first wiring 11. More specifically, the anode electrode 31b of the first light-emitting element 31 mounted on the first conductive pattern 41a at the top is electrically connected to the pad portion 11a1 of the connection portion 11a of the first wiring 11 via the metal wire 35. In this manner, the first conductive pattern 41a at the top and the connection portion 11a of the first wiring 11 are electrically connected to each other via the first light-emitting element 31 and the metal wire 35. Thus, a current can be supplied from an external device to the anode electrode 31b of the first light-emitting element 31 mounted furthest in the -X direction among the first light-emitting element group 72A via the connector portion 78, the terminal portion 77, and the first wiring 11. In the first light-emitting element group 72A, the multiple first light-emitting elements 31 have a structure in which they are connected in series so that a current flows along the +X direction.

[0071] The second light emitting element group 72B is connected in series to the first light emitting element group 72A. The second light emitting element group 72B has a similar configuration to the first light emitting element group 72A. In the second light-emitting element group 72B, the second element conduction section 42 has a plurality of second conductive patterns 42a. The plurality of second conductive patterns 42a are patterns separated from one another and all have the same shape. Each of the plurality of second conductive patterns 42a extends in the Z-axis direction intersecting with the -X direction. The plurality of second conductive patterns 42a are provided corresponding to the plurality of second light-emitting elements 32, respectively, and each of the plurality of conduction patterns 42a extends in the Z-axis direction. In other words, the number of the second conductive patterns 42a is the same as the number of the second light-emitting elements 32. Each of the conduction patterns 42a is made of gold, copper, aluminum, or the like, and corresponds to a part of the conductive layer 752 shown in FIG. 4 that forms a part of the wiring group 74.

[0072] The multiple second conductive patterns 42a are patterns separated from one another, and the second conductive patterns 42a adjacent to each other in the X-axis direction do not contact each other. The second conductive pattern 42a includes a mounting portion 420 on which the second light-emitting element 32 is mounted, a pair of protruding portions 421 protruding from both sides of the mounting portion 420, a pair of connecting portions 422 connecting the pair of protruding portions 421 and the mounting portion 420, and a pair of conductive portions 423 provided on the -X side of the pair of connecting portions 422 and electrically connected to the second light-emitting element 32 mounted on the adjacent second conductive pattern 42a. Therefore, each of the multiple second conductive patterns 42a has a shape extending on both sides in the Z-axis direction with respect to the corresponding second light-emitting element 32.

[0073] Between the second conductive patterns 42a adjacent to each other in the X-axis direction, each conductive portion 423 protruding from the second conductive pattern 42a on one side (+X side) is disposed so as to enter the recess 422a of the coupling portion 422 of the second conductive pattern 42a on the other side (-X side). As a result, between the adjacent second conductive patterns 42a, each conductive portion 423 of the second conductive pattern 42a on one side (+X side) is disposed near the mounting portion 420 of the second conductive pattern 42a on the other side (-X side).

[0074] Each of the second light-emitting elements 32 is composed of a light-emitting diode (LED) like the first light-emitting elements 31. Therefore, the second light-emitting element 32 has a light-emitting surface 32a, two anode electrodes 32b, and one cathode electrode 32c.

[0075] Here, of the two second conductive patterns 42a adjacent to each other in the X-axis direction, the right side (+X side) is referred to as the second conductive pattern 142a, and the left side (-X side) is referred to as the second conductive pattern 242a. In addition, the second light-emitting element 32 mounted on the second conductive pattern 142a is referred to as the second light-emitting element 132, and the second light-emitting element 32 mounted on the second conductive pattern 242a is referred to as the second light-emitting element 232.

[0076] The second light emitting element 232 is mounted in a direction in which the cathode electrode 32c is placed on the mounting portion 420 of the second conductive pattern 242a. The second light emitting element 232 mounted on the second conductive pattern 242a is electrically connected to the second conductive pattern 142a located in the +X direction. Specifically, each anode electrode 32b of the second light emitting element 232 is connected to each conductive portion 423 of the second conductive pattern 142a via a metal wire 35.

[0077] In this way, the cathode electrode 32c of the second light-emitting element 32 mounted on the second conductive pattern 42a and the anode electrode 32b of the second light-emitting element 132 mounted on the second conductive pattern 142a are brought into an electrically conductive state via the second conductive pattern 42a. Furthermore, between other second light-emitting elements 32 adjacent to each other in the X-axis direction, the cathode electrode 32c of one second light-emitting element 32 and the anode electrode 32b of the other second light-emitting element 32 are electrically connected.

[0078] Of the multiple second conductive patterns 42a arranged in the -X direction, the second conductive pattern 42a located furthest in the +X direction, i.e., at the top, is electrically connected to the connection portion 12a of the second wiring 12. More specifically, the anode electrode 32b of the second light-emitting element 32 mounted on the top second conductive pattern 42a is electrically connected to the pad portion 12a1 of the connection portion 12a of the second wiring 12 via the metal wire 35. As a result, the anode electrode 32b of the second light-emitting element 32 mounted furthest in the +X direction among the second light-emitting element group 72B is electrically connected via the second wiring 12 to the cathode electrode 31c of the first light-emitting element 31 mounted furthest in the +X direction among the first light-emitting element group 72A.

[0079] Furthermore, among the multiple second conductive patterns 42a aligned in the -X direction, the second conductive pattern 42a located furthest in the -X direction, i.e., at the rearmost position, is electrically connected to a ground pattern GP provided on the base substrate 71. More specifically, the rearmost second conductive pattern 42a is connected to the ground pattern GP via a pair of connection parts 45. Therefore, in the second light-emitting element group 72B, the multiple second light-emitting elements 32 have a structure in which they are connected in series so that a current flows along the −X direction.

[0080] Each connection portion 45 is routed from both ends in the Z-axis direction of the rearmost second conductive pattern 42a in the +X direction, which is inside the base substrate 71, and then connected to the ground pattern GP near the second wiring 12. If the connection portion 45 connecting the second conductive pattern 42a and the ground pattern GP were extended toward the outside of the base substrate 71, the size of the base substrate 71 may become larger. In the case of this embodiment, the connection portion 45 extends toward the inside of the base substrate 71, so that the size of the base substrate 71 can be prevented from becoming larger.

[0081] 5, the second connection portion 76 has a structure that is line-symmetrical with respect to the first connection portion 75 with respect to the central axis 71C of the base substrate 71. Specifically, the second connection portion 76 includes a third wiring 13 and a fourth wiring 14. The third wiring 13 includes a connection portion 13a and a routing portion 13b. The fourth wiring 14 includes a connection portion 14a and a routing portion 14b.

[0082] The connection portion 13a extends along the Z direction and is connected to the +X side of the third light-emitting element group 72C. Specifically, the connection portion 13a is connected to the third element conduction portion 43 of the third light-emitting element group 72C. The wiring portion 13b of the third wiring 13 is wired from the connection portion 13a along the third light-emitting element group 72C and connected to the first terminal 77a of the terminal portion 77.

[0083] The connection portion 14a of the fourth wiring 14 extends along the connection portion 13a and is connected to the -X side of the fourth light-emitting element group 72D. Specifically, the connection portion 14a is connected to the fourth element conduction portion 44 of the fourth light-emitting element group 72D. The wiring portion 14b of the fourth wiring 14 is routed from the connection portion 14a along the third light-emitting element group 72C in the -X direction and connected to the -X side of the third light-emitting element group 72C. Specifically, the wiring portion 14b is connected to the third element conduction portion 43 of the third light-emitting element group 72C.

[0084] Based on this configuration, in the third light-emitting element group 72C, the third light-emitting elements 33 are connected in series so that a current flows along the -X direction. In the fourth light-emitting element group 72D, the fourth light-emitting elements 34 are connected in series so that a current flows along the +X direction.

[0085] Returning to FIG. 2, the support member 54 extends in the X-axis direction along the longitudinal direction of the wavelength conversion member 50, has a groove 154 that accommodates a part of the wavelength conversion member 50, and the wavelength conversion member 50 is disposed inside the groove 154, and diffuses and releases heat generated by the wavelength conversion member 50 to the outside. For this reason, it is desirable that the support member 54 is made of a material that has a predetermined strength and high thermal conductivity. For example, metals such as aluminum and stainless steel are used as the material for the support member 54, and it is particularly desirable to use an aluminum alloy such as 6061 series. The specific configuration of the support member 54 will be described later.

[0086] The wavelength conversion member 50 of the present embodiment includes a first protrusion 151 that protrudes from the groove 154 in the +X direction, and a second protrusion 152 that protrudes from the groove 154 in the -X direction. The holding member 65 holds the first protruding portion 151 or the second protruding portion 152 protruding from the groove portion 154 of the support member 54. Therefore, the wavelength conversion member 50 is in a state where a part of it protrudes outside the groove portion 154 of the support member 54 without contacting the wall surface of the groove portion 154. The holding member 65 holds the part of the wavelength conversion member 50 protruding outside the groove portion 154. The holding member 65, together with the pair of pressing members 91, 92, regulates the position of the wavelength conversion member 50 with respect to the support member 54.

[0087] The pair of pressing members 91, 92 regulate the position of the wavelength conversion member 50 in the Y-axis direction relative to the support member 54 inside the groove portion 154. The pressing member 91 corresponds to a "first regulating member" in the claims, and the pressing member 92 corresponds to a "second regulating member" in the claims.

[0088] The pair of pressing members 91, 92 are disposed facing the support surface 54s of the groove portion 154. In this way, the pair of pressing members 91, 92 restrict the wavelength conversion member 50 from moving in the Y-axis direction within the groove portion 154. The pair of pressing members 91, 92 are made of an elastically deformable material. As an example, the pair of pressing members 91, 92 are made of leaf springs made of a metal material, for example, a stainless steel material such as SUS304.

[0089] The pair of pressing members 91, 92 are disposed between the wavelength conversion member 50 and the base substrate 71, and press the wavelength conversion member 50 against the support surface 54s of the groove portion 154 of the support member 54. The pair of pressing members 91, 92 are fixed to the support member 54. Although details will be described later, the pair of pressing members 91, 92 are disposed so as to overlap the first connection portion 75 and the second connection portion 76 in the gaps S1, S2 in a plan view.

[0090] The mirror 53 is provided on the second surface 50b 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 second surface 50b. The mirror 53 is made of a metal film or a dielectric multilayer film formed on the second surface 50b of the wavelength conversion member 50.

[0091] In the first lighting device 20, when the excitation light E emitted from the light source unit 70 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 50c, 50d, 50e, and 50f travels toward the first surface 50a or the second surface 50b while repeating total reflection at multiple points on the side surfaces 50c, 50d, 50e, and 50f. The first surface 50a 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 first surface 50a is incident on the angle conversion member 52 provided on the first surface 50a. The fluorescence Y traveling toward the second surface 50b is reflected by the mirror 53 and travels toward the first surface 50a.

[0092] 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 source unit 70, 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.

[0093] The angle conversion member 52 is provided on the first surface 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 surface 52a on which the fluorescence Y emitted from the wavelength conversion member 50 is incident, a light exit surface 52b from which the fluorescence Y exits, and a side surface 52c that reflects the incident fluorescence Y toward the light exit surface 52b.

[0094] 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.

[0095] The fluorescence Y that has entered 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 first surface 50a 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.

[0096] 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.

[0097] 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 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 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.

[0098] 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.

[0099] The collimating optical system 63 is composed of a collimator lens and the like, and is provided between the light source device 100 and the integrator optical system 80. The collimating optical system 63 further narrows the angular distribution of the fluorescence Y emitted from the light source device 100, and causes the highly parallel fluorescence Y to be incident on the integrator optical system 80. Note that the collimating optical system 63 does not need to be provided when the parallelism of the fluorescence Y emitted from the angle conversion member 52 is sufficiently high.

[0100] The integrator optical system 80 has a first lens array 61 and a second lens array 101. The integrator optical system 80, 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 63 is incident on the first lens array 61. The first lens array 61, together with the second lens array 101 provided downstream of the light source device 100, constitutes the integrator optical system 80.

[0101] The first lens array 61 has a plurality of first small lenses 61a. The plurality of first small lenses 61a 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 61a 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 61a 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 61 efficiently enters the image forming areas of the light modulation devices 4R and 4G.

[0102] The fluorescence Y emitted from the first lens array 61 travels 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 small lenses 101a corresponding to the plurality of first small lenses 61a of the first lens array 61. The second lens array 101, together with the superimposing optical system 103, forms each of the images of the plurality of first small lenses 61a of the first lens array 61 in the vicinity of the image forming areas of the light modulation devices 4R and 4G. The plurality of second small lenses 101a 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.

[0103] In this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 101a of the second lens array 101 have the same size, but may have different sizes. In this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 101a of the second lens array 101 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.

[0104] 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 light beam of the fluorescence Y split by the first lens array 61 and emitted from the second lens array 101 into linearly polarized light.

[0105] 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.

[0106] The fluorescence Y transmitted through the polarization conversion element 102 is incident on the superimposing optical system 103. The superimposing optical system 103 cooperates with the integrator optical system 80 to form a uniform illumination optical system that homogenizes the intensity distribution of the fluorescence Y in each of the light modulation devices 4R and 4G, which are the illuminated regions.

[0107] In the light source device 100 of this embodiment, the light emitting element groups 72A, 72B, 72C, and 72D of the light source section 70 generate heat when emitting the excitation light E. In each of the light emitting element groups 72A, 72B, 72C, and 72D, if the temperature of the light emitting element made of LED increases, the emission wavelength becomes longer, and the amount of light of the desired wavelength may decrease. In addition, the lower the operating temperature of the LED, the higher the light emitting efficiency and the longer the lifespan.

[0108] In the light source device 100 of this embodiment, the light emitting elements of the light emitting element groups 72A, 72B, 72C, and 72D are efficiently cooled. Hereinafter, a case where the first light emitting element 31 of the first light emitting element group 72A is cooled will be described as an example.

[0109] For example, heat from the first light-emitting element 31 of the first light-emitting element group 72A is transferred to the base material 750 of the base substrate 71 via the first conductive pattern 41a. In the present embodiment, as shown in FIG. 6, the first conductive pattern 41a has a shape extending on both sides of the first light-emitting element 31 in the Z-axis direction. Therefore, compared to a case where the first conductive pattern 41a has substantially the same size as the first light-emitting element 31, the first conductive pattern 41a can transfer the heat of the first light-emitting element 31 to the base material 750 side while spreading it around. Therefore, the first conductive pattern 41a can efficiently cool the first light-emitting element 31.

[0110] In addition, in this embodiment, the plurality of first conductive patterns 41a all have the same shape. This allows the heat dissipation performance of the first light-emitting elements 31 in the first conductive pattern 41a to be approximately uniform. This makes it possible to reduce the occurrence of variations in the cooling performance between the plurality of first light-emitting elements 31. In this way, by suppressing the temperature difference between the first light-emitting elements 31, it is possible to suppress unevenness in the illuminance of the excitation light E emitted from the first light-emitting element group 72A.

[0111] The same can be said about the other light-emitting element groups 72B, 72C, and 72D. Therefore, it is possible to efficiently cool the second light-emitting element 32, the third light-emitting element 33, and the fourth light-emitting element 34. Also, it is possible to suppress unevenness in illuminance of the excitation light E emitted from each of the light-emitting element groups 72B, 72C, and 72D.

[0112] In the light source device 100 of the present embodiment, it is preferable to obtain bright fluorescence Y by efficiently making the excitation light E incident on the wavelength conversion member 50 . In order to efficiently cause the excitation light E to be incident on the wavelength conversion member 50, it is desirable to arrange the base substrate 71 and the wavelength conversion member 50 as close as possible to each other. If the base substrate 71 and the wavelength conversion member 50 are arranged close to each other, there is a risk that the pressing members 91 and 92 located between the wavelength conversion member 50 and the base substrate 71 may come into contact with any of the light-emitting elements of each of the light-emitting element groups 72A, 72B, 72C, and 72D.

[0113] In contrast, in the case of light source device 10 of the present embodiment, in a plan view, one pressing member 91 is arranged to overlap with first connection portion 75 in gap S1 provided on base substrate 71, and the other pressing member 92 is arranged to overlap with second connection portion 76 in gap S2 provided on base substrate 71. Since gaps S1 and S2 are arranged line-symmetrically with respect to central axis 71C of base substrate 71, by aligning the center of base substrate 71 with the center of wavelength conversion member 50, the pair of pressing members 91 and 92 can be arranged in a well-balanced manner in the length direction of wavelength conversion member 50 with respect to the center of wavelength conversion member 50. This allows the pair of pressing members 91 and 92 to stably hold wavelength conversion member 50 in groove portion 154.

[0114] As described above, no light-emitting element is disposed in the gap S1 in which the pressing member 91 is disposed, and therefore the pressing member 91 does not block light from the light-emitting element. Similarly, as described above, no light-emitting element is disposed in the gap S2 in which the pressing member 92 is disposed, and therefore the pressing member 92 does not block light from the light-emitting element.

[0115] Furthermore, by entering the gap S1, the pressing member 91 can position the first light-emitting element group 72A and the second light-emitting element group 72B closer to the wavelength conversion member 50 in the Y-axis direction. Similarly, by entering the gap S2, the pressing member 92 can position the third light-emitting element group 72C and the fourth light-emitting element group 72D closer to the wavelength conversion member 50 in the Y-axis direction.

[0116] In this way, the light source device 100 of this embodiment can achieve further miniaturization of the device configuration by efficiently utilizing the space on the first surface 71a of the base substrate 71 by aligning the positions of the pair of pressing members 91, 92 with the positions of the gaps S1, S2. Therefore, according to the light source device 10 of the present embodiment, it is possible to realize a configuration in which bright fluorescence Y is generated by efficiently making the excitation light E incident on the wavelength conversion member 50 while achieving a compact device configuration.

[0117] Fig. 7 is a plan view of the light source device 100 as viewed from the Y-axis direction. In Fig. 7, the light source section 70 is indicated by a two-dot chain line for ease of viewing. Also, in Fig. 7, the light emitting element groups 72A, 72B, 72C, and 72D are not shown.

[0118] 7, the light source device 100 of the present embodiment includes a protrusion 30 that brings the base substrate 71 and the support member 54 into contact with each other. Specifically, the protrusion 30 is provided on an opposing surface 30a of the support member 54 that faces the first surface 71a of the base substrate 71. The protrusion 30 brings the base substrate 71 into contact with the support member 54 while keeping the light source unit 70 apart from the support member 54 and the wavelength conversion member 50.

[0119] As shown in FIG. 3, the convex portion 30 and the terminal portion 77 are arranged opposite each other with each light-emitting element group 72A, 72B, 72C, 72D in between. Here, consider the case where the convex portion 30 and the terminal portion 77 are arranged on one side of each light-emitting element group 72A, 72B, 72C, 72D. In this case, since it is necessary to arrange the convex portion 30 at a position where it does not interfere with the terminal portion 77, there is a risk that the size of the base substrate 71 will be increased in order to secure a space for separately providing the convex portion 30. In contrast, according to the configuration of this embodiment, as shown in FIG. 3, the convex portion 30 can be arranged on the opposite side to the terminal portion 77 and in an area with ample space, so that the light source device 100 can be made smaller by efficiently using the space on the first surface 71a of the base substrate 71.

[0120] In addition to the convex portion 30, the support member 54 has 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, a light source fixing portion 547, and a cutout portion 548.

[0121] The spring fixing parts 540 are disposed on both sides of the groove part 154 in the Z-axis direction along the short side of the wavelength conversion member 50. The spring fixing parts 540 fix both ends of the pressing members 91, 92 disposed across the wavelength conversion member 50 in the Z-axis direction with screws 96. The notch parts 548 are intended to suppress interference with the connector part 78 provided on the base substrate 71 when the light source part 70 is fixed to the support member 54.

[0122] The protruding portion 30 is disposed closer to the inner circumference of the base substrate 71 than the fixing portion 79. Here, the inner circumference of the base substrate 71 than the fixing portion 79 means the inner side of an imaginary line passing through the centers of the four through holes 79a that constitute the fixing portion 79. In other words, the protruding portion 30 is provided at a position closer to the center of the base substrate 71 than the fixing portion 79.

[0123] The protrusion 30 is a protruding body that protrudes in the -Y direction from the support member 54. The protrusion 30 may be formed integrally with the support member 54, or may be composed of a member separate from the support member 54. In the case of this embodiment, the protrusion 30 is formed integrally with the support member 54.

[0124] The convex portion 30 is disposed at a position where it does not overlap with each light-emitting element of each of the light-emitting element groups 72A, 72B, 72C, 72D when viewed in a plan view in the Y direction which is the normal direction of the opposing surface 30a of the support member 54, and where it does not abut against the wavelength conversion member 50. This configuration makes it possible to suppress the occurrence of problems such as damage to the light-emitting surface due to the convex portion 30 coming into contact with the light-emitting surface of the light-emitting element, or the convex portion 30 preventing the excitation light E emitted from the light-emitting surface from entering the wavelength conversion member 50.

[0125] According to the light source device 100 of the present embodiment, the light source section 70 and the support member 54 abut against each other via the protrusions 30 disposed between the base substrate 71 and the support member 54. The protrusions 30 function as spacers that regulate the distance between the light source section 70 and the support member 54 in the Y-axis direction, which is the stacking direction of the light source section 70 and the support member 54. The protrusions 30 have at least a degree of rigidity that prevents the protrusions 30 from deforming when sandwiched between the light source section 70 and the support member 54.

[0126] In a state where the base substrate 71 is fixed to the support member 54, that is, in a state where the fixing portion 79 of the base substrate 71 is fixed to the light source fixing portion 547 of the support member 54 with a screw, the protruding portion 30 is inserted into the recessed portion 60 formed in the first surface 71a of the base substrate 71. The protruding portion 30 abuts against the first insulating layer 751 exposed in the recessed portion 60 shown in FIG.

[0127] Here, the flatness of the first insulating layer 751 covering the surface 750a of the base material 750 is higher than the flatness of the second insulating layer 753 covering the conductive layer 752. In the case of the present embodiment, the protrusions 30 abut against the first insulating layer 751, which has a higher flatness than the second insulating layer 753, so that the support member 54 and the base substrate 71 are well adhered to each other via the protrusions 30.

[0128] The height in the Y direction of the protrusion 30 is greater than the height in the Y direction of the pressing members 91, 92 that abut against the third surface 50c of the wavelength conversion member 50. The protrusion 30 protrudes toward the light source unit 70 side more than the pressing members 91, 92, thereby separating the pressing members 91, 92 from the light source unit 70. The pressing members 91, 92 do not contact the first surface 71a of the base substrate 71 of the light source unit 70. This makes it possible to suppress the occurrence of defects such as disconnection or short-circuiting of the conductive layer 752 shown in FIG. 4 caused by the pressing members 91, 92 applying pressure to the first surface 71a.

[0129] The light source fixing portion 547 includes a plurality of pedestal portions 547a. The plurality of pedestal portions 547a correspond to the plurality of through holes 79a of the fixing portion 79 of the base substrate 71. In other words, the number of pedestal portions 547a of the light source fixing portion 547 is the same as the number of through holes 79a of the fixing portion 79. Each pedestal portion 547a is provided with a female screw for fixing a screw inserted into the corresponding through hole 79a.

[0130] In the direction along the Y-axis, the heights of the pedestals 547a are equal, and the heights of the protrusions 30 and the heights of the pedestals 547a are approximately equal. For example, when the gap between the light-emitting elements of each of the light-emitting element groups 72A, 72B, 72C, and 72D and the third surface 50c of the wavelength conversion member 50 is 0.3 mm, the tolerance of the pedestals 547a and the protrusions 30 is set to ±0.1 mm or less.

[0131] In the case of the base substrate 71 of this embodiment, as described above, the convex portion 30 abuts against the first insulating layer 751 exposed in the concave portion 60, but the first insulating layer 751 is also exposed at the fixing portions 79 that abut against each pedestal portion 547a of the same height as the convex portion 30. By aligning the heights of the base portion 547a and the convex portion 30 in this manner and abutting the base portion 547a and the convex portion 30 against the first insulating layer 751, the base substrate 71 and the support member 54 are supported in a stable state without any rattling via the convex portion 30 and the light source fixing portion 547.

[0132] FIG. 8 is a cross-sectional view of the light source device 100 taken along line VIII-VIII in FIG. 8, in light source device 100 of the present embodiment, base substrate 71 and support member 54 come into contact with each other via protrusions 30 located on the inner periphery side of fixing portion 79. This prevents base substrate 71 from warping toward wavelength conversion member 50. Thus, light source device 100 of the present embodiment can generate bright fluorescence Y by efficiently directing excitation light E to wavelength conversion member 50 by appropriately maintaining the distance between light source unit 70 and third surface 50c of wavelength conversion member 50, and can prevent defects such as chipping and breakage due to contact between light source unit 70 and wavelength conversion member 50.

[0133] Further, the groove 154 of the support member 54 has a U-shaped cross section perpendicular to the X-axis direction. The groove 154 has a support surface 54s, a first wall surface 54a, and a second wall surface 54b.

[0134] The support surface 54s corresponds to the bottom surface of the groove portion 154. In the case of this embodiment, the support surface 54s is a surface extending parallel to the XZ plane, and supports the fourth surface 50d of the wavelength conversion member 50. The first wall surface 54a corresponds to one side surface of the groove portion 154, faces the fifth surface 50e of the wavelength conversion member 50, and is spaced from the fifth surface 50e. That is, a gap is provided between the first wall surface 54a and the fifth surface 50e of the wavelength conversion member 50. The second wall surface 54b corresponds to the other side surface of the groove portion 154, faces the sixth surface 50f of the wavelength conversion member 50, and is spaced from the sixth surface 50f. That is, a gap is provided between the second wall surface 54b and the sixth surface 50f of the wavelength conversion member 50.

[0135] The first wall surface 54a has a first portion 54a1 located on the third surface 50c side and a second portion 54a2 located on the support surface 54s side. The first portion 54a1 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The second portion 54a2 inclines so as to approach the fifth surface 50e from the first portion 54a1 side toward the support surface 54s side. In other words, the distance between the second portion 54a2 on the support surface 54s side and the fifth surface 50e is smaller than the distance between the second portion 54a2 on the first portion 54a1 side and the fifth surface 50e.

[0136] The second wall surface 54b has a third portion 54b3 located on the third surface 50c side and a fourth portion 54b4 located on the support surface 54s side. The third portion 54b3 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The fourth portion 54b4 is inclined so as to approach the sixth surface 50f from the third portion 54b3 side toward the support surface 54s side. In other words, the distance between the fourth portion 54b4 and the sixth surface 50f on the support surface 54s side is smaller than the distance between the fourth portion 54b4 and the sixth surface 50f on the third portion 54b3 side.

[0137] Each of the first wall surface 54a and the second wall surface 54b is made of a surface of a metal such as aluminum or stainless steel, which is a material of the support member 54. More specifically, each of the first wall surface 54a and the second wall surface 54b is made of a processed surface that is a mirror-finished surface of the above-mentioned metal surface. Therefore, each of the first wall surface 54a and the second wall surface 54b has light reflectivity and reflects the incident excitation light E. Note that each of the first wall surface 54a and the second wall surface 54b may be made of another metal film or a dielectric multilayer film formed on a surface of a metal such as aluminum or stainless steel.

[0138] Since the first wall surface 54a and the second wall surface 54b of the groove portion 154 need to be mirror-finished as described above, the portion where the groove portion 154 is provided requires higher machining accuracy than other portions of the support member 54. For this reason, the portion of the support member 54 where the groove portion 154 is provided may be made of a separate member, and may be combined with a separate member forming the portion other than the groove portion 154 to form one support member 54. In other words, the support member 54 may be made of a combination of multiple members. In this way, since the peripheral portion of the groove portion 154 is formed of a separate member, the workability and machining accuracy of the first wall surface 54a and the second wall surface 54b of the groove portion 154 can be improved.

[0139] Hereinafter, when there is no particular distinction between the light-emitting elements of each of the light-emitting element groups 72A, 72B, 72C, and 72D, they will be simply referred to as light-emitting elements 73. The dimension W1 along the Z-axis direction of the light-emitting elements 73 of each of the light-emitting element groups 72A, 72B, 72C, and 72D is greater than the width B2 along the Z-axis direction of the wavelength conversion member 50. Note that the width in the Z-axis direction of the wavelength conversion member 50 in this embodiment is uniform throughout the longitudinal direction. As a result, in the Z-axis direction, both ends of the light-emitting surface 73a of the light-emitting element 73 protrude outside the third surface 50c of the wavelength conversion member 50. Specifically, both ends of the light-emitting surface 73a of the light-emitting element 73 protrude to positions overlapping the gap between the fifth surface 50e and the first wall surface 54a and the gap between the sixth surface 50f and the second wall surface 54b. In other words, when the light-emitting surface 73a is viewed along the Y-axis direction from the support surface 54s, a part of the light-emitting surface 73a overlaps with the third surface 50c, and another part of the light-emitting surface 73a overlaps with the gap between the fifth surface 50e and the first wall surface 54a and the gap between the sixth surface 50f and the second wall surface 54b.

[0140] The first width D2 of the support surface 54s of the support member 54 along the Z-axis direction is larger than the width B2 of the wavelength conversion member 50 along the Z-axis direction. As a result, both ends of the support surface 54s in the Z-axis direction protrude outside 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 73a along the Y-axis direction, a part of the support surface 54s overlaps with the fourth surface 50d, and another part of the support surface 54s is exposed outside the fourth surface 50d. In this way, the support surface 54s has an exposed portion exposed to the outside of the wavelength conversion member 50.

[0141] According to the light source device 100 of this embodiment, a part of the excitation light E2 emitted from the light emitting surface 73a of the light emitting element 73 passes through the gap between the fifth surface 50e of the wavelength conversion member 50 and the first portion 54a1, and then enters the second portion 54a2 inclined with respect to the support surface 54s. At this time, the excitation light E2 is reflected by the second portion 54a2 and enters the fifth surface 50e of the wavelength conversion member 50. In this way, the excitation light E2 passing through the gap between the fifth surface 50e of the wavelength conversion member 50 and the first wall surface 54a is easily entered into the fifth surface 50e, so that the amount of the excitation light E reflected by the support surface 54s and returning to the light source unit 70 can be reduced. In addition, a part of the excitation light E is reflected by the first portion 54a1 extending perpendicularly to the support surface 54s and enters the fifth surface 50e of the wavelength conversion member 50. This makes it possible to realize a light source device 100 in which the utilization efficiency of the excitation light E is high and fluorescence Y having a desired intensity can be easily obtained.

[0142] Returning to FIG. 7 , the first accommodating portion 541 is a recess communicating with the groove portion 154 in the +X direction. The first accommodating portion 541 penetrates to the outer edge 54d of the support member 54. The first accommodating portion 541 accommodates the first protruding portion 151 of the wavelength conversion member 50 protruding from the groove portion 154. The first accommodating portion 541 also holds the angle conversion member 52 fixed to the first surface 50a of the wavelength conversion member 50. In this embodiment, the angle conversion member 52 fixed to the first surface 50a of the first protruding portion 151 is held by the support member 54. The light exit surface 52b of the angle conversion member 52 housed in the first housing portion 541 is flush with the outer edge 54d of the support member 54 in a plan view.

[0143] The second accommodating portion 542 is a recess communicating with the groove portion 154 in the -X direction. The second accommodating portion 542 penetrates to the outer edge 54d of the support member 54. The second accommodating portion 542 accommodates the second protruding portion 152 of the wavelength conversion member 50 protruding from the groove portion 154. The second accommodating portion 542 is provided in a state not communicating with the outer edge 54d of the support member 54. The second accommodating portion 542 accommodates the second protruding portion 152 of the wavelength conversion member 50 protruding from the groove portion 154. In this embodiment, the mirror 53 is provided on the second surface 50b of the second protruding portion 152. The second accommodating portion 542 accommodates the mirror 53 provided on the second surface 50b of the wavelength conversion member 50.

[0144] 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 holding member 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.

[0145] 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 a holding member 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.

[0146] 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 a holding member 65 that holds the +Z side of the second protrusion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0147] The sixth accommodating portion 546 is a recess that communicates with the third accommodating portion 543 in the -Z direction. The sixth accommodating portion 546 accommodates a holding member 65 that holds the -Z side of the second protrusion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0148] The pair of holding members 65 sandwiching the first protruding portion 151 and the second protruding portion 152 of the wavelength conversion member 50 from both sides are capable of adjusting their positions in the Z axis direction.

[0149] In this manner, the wavelength conversion member 50 of this embodiment is held within the groove portion 154 with the movement in the Z-axis direction of the first protrusion 151 and the second protrusion 152 protruding outside the groove portion 154 being restricted by the holding member 65.

[0150] As described above, the light source device 100 of the present embodiment includes the base substrate 71, the first light-emitting element group 72A and the second light-emitting element group 72B arranged on the base substrate 71 with a gap S1 therebetween, the light source section 70 having the first connection section 75 arranged in the gap S1 and electrically connecting the first light-emitting element group 72A and the second light-emitting element group 72B, the wavelength conversion member 50 that guides the excitation light E emitted from the light source section 70, the support member 54 that supports the wavelength conversion member 50 and to which the base substrate 71 of the light source section 70 is fixed, and the pressing member 91 that is arranged between the wavelength conversion member 50 and the base substrate 71 and regulates the position of the wavelength conversion member 50 relative to the support member 54. The first light-emitting element group 72A has a configuration in which a plurality of first light-emitting elements 31 are connected in series so that a current flows along the +X direction. The second light-emitting element group 72B has a configuration in which a plurality of second light-emitting elements 32 are connected in series so that a current flows along the -X direction. In plan view, the pressing member 91 is disposed so as to overlap the first connecting portion 75 in the gap S1.

[0151] According to the light source device 100 of this embodiment, by aligning the position of the pressing member 91 with the position of the gap S1, the space on the first surface 71a of the base substrate 71 can be efficiently utilized, thereby achieving a compact device configuration.

[0152] Furthermore, in the light source device 100 of this embodiment, for example, by adjusting the number of each of the light emitting elements constituting the first light emitting element group 72A and the second light emitting element group 72B without changing the total number of light emitting elements constituting the first light emitting element group 72A and the second light emitting element group 72B, it is possible to easily change the position of the gap S1 on the base substrate 71. Therefore, according to the light source device 100 of this embodiment, it is possible to realize a compact device configuration while increasing the degree of freedom in the arrangement location of the pressing member 91.

[0153] The projector 1 of the present embodiment includes a compact light source device 100 that efficiently extracts bright fluorescent light Y from the wavelength conversion member 50, and therefore a compact projector with excellent light utilization efficiency can be provided.

[0154] (First Modification) A first modified example of this embodiment will be described below. 9 is a plan view showing the main configuration of the light source device of the first modified example. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals, and description thereof will be omitted.

[0155] In the case of the light source device 200 of this modification, for example, two first light emitting elements 131 are mounted on each of the first conductive patterns 41a of the first light emitting element group 72A. Similarly, two light emitting elements are mounted on each of the conductive patterns of the other light emitting element groups 72B to 72D. The configuration of the first light emitting element 131 will be described below as an example.

[0156] The first light emitting element 131 is composed of a light emitting diode (LED) and has a light emitting surface 131a, one anode electrode 131b, and one cathode electrode 131c. In the first light emitting element 131, the light emitting surface 131a and the one anode electrode 131b are provided on a front surface facing away from the base substrate 71, and the cathode electrode 131c is provided on a back surface facing the base substrate 71 side opposite to the front surface.

[0157] The anode electrode 131b of the first light emitting element 131 of this modification has a rectangular shape extending along one side of the light emitting surface 131a. According to the first light emitting element 131 of this modification, a plurality of metal wires 35 (three in FIG. 9) can be used to electrically connect the anode electrode 131b and the conductive portion 413 of the first conductive pattern 41a.

[0158] According to this configuration, a current can be supplied to the light-emitting surface 131a of each first light-emitting element 131 via the three metal wires 35, so that the current density supplied to the light-emitting surface 131a is stable and excitation light can be uniformly emitted from the light-emitting surface 131a. Therefore, each first light-emitting element 131 can emit uniform and bright excitation light from the light-emitting surface 131a.

[0159] (Second Modification) A second modified example of this embodiment will now be described. 10 is a diagram showing the main configuration of a light source device of Modification 2. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals, and description thereof will be omitted.

[0160] In the above embodiment, the pair of pressing members 91, 92 are provided on the support member 54 as restricting members for restricting the position of the wavelength conversion member 50 relative to the groove portion 154. However, the present invention is not limited to this. For example, the restricting members may be provided on the light source unit 70 side.

[0161] 10, in light source device 300 of this modification, first restricting member 191 and second restricting member 192 are respectively disposed in gaps S1 and S2 provided on base substrate 71. First restricting member 191 is disposed so as to overlap first connecting portion 75 in gap S1, and second restricting member 192 is disposed so as to overlap second connecting portion 76 in gap S2. With third surface 50c of wavelength conversion member 50 pressed by first restricting member 191 and second restricting member 192, fourth surface 50d abuts against support surface 54s of groove portion 154. As a result, the position of wavelength conversion member 50 with respect to groove portion 154 is restricted.

[0162] The first and second restricting members 191 and 192 also function as spacer members that maintain a predetermined distance between the light source unit 70 and the wavelength conversion member 50. The height of the first and second restricting members 191 and 192 is, for example, about 0.2 mm to 2 mm. The first and second restricting members 191 and 192 are desirably made of a material having excellent light resistance, such as metal or glass. The first and second restricting members 191 and 192 may be formed directly on the first surface 71a of the base substrate 71 by a method such as screen printing.

[0163] In the light source device 300 of this modified example, by aligning the positions of the first regulating member 191 and the second regulating member 192 with the positions of the gaps S1 and S2, the space on the first surface 71a of the base substrate 71 can be efficiently utilized to reduce the size of the device configuration. Furthermore, by adjusting the number of light-emitting elements constituting the first light-emitting element group 72A and the second light-emitting element group 72B or the number of light-emitting elements constituting the third light-emitting element group 72C and the fourth light-emitting element group 72D, the positions of the gaps S1, S2 on the base substrate 71 can be easily changed. Therefore, it is possible to realize a compact device configuration while increasing the degree of freedom in the placement of the first restricting member 191 and the second restricting member 192.

[0164] 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, in the light source device 100 of the above embodiment, the convex portion 30 is provided on the support member 54, but the convex portion may be provided on the first surface 71a of the base substrate 71. Alternatively, the light emitting element 73 may be spaced apart from the support member 54 and the wavelength conversion member 50 by butting the convex portions provided on the support member 54 and the first surface 71a of the base substrate 71 against each other.

[0165] In the light source device 100 of the above embodiment, the convex portion 30 is inserted into the concave portion 60 of the base substrate 71, but a configuration in which the convex portion abuts against the first surface 71a of the base substrate 71 that does not have a concave portion may be adopted. In this case, the pedestal portion 547a of the support member 54 and the upper surface of the convex portion 30 may be aligned at the same height.

[0166] In the light source device 100 of the above embodiment, the base substrate 71 and the support member 54 may be fixed to each other with screws at the protrusion 30. With this configuration, the number of fixing points between the base substrate 71 and the support member 54 increases, so that the light source unit 70 and the support member 54 can be fixed more firmly.

[0167] In the light source device 100 of the above embodiment, the wavelength conversion member 50 has the first protrusion 151 and the second protrusion 152 in the X-axis direction, but only the first protrusion 151 may be provided. In this case, the holding member 65 is disposed only on the first protrusion 151 side.

[0168] In the above embodiment, each wall surface of the groove 154 of the support member 54 has a portion perpendicular to the support surface 54s and a portion inclined relative to the support surface 54s, but the shape of the groove 154 is not particularly limited, and for example, the entire area of ​​the wall surface of the groove may be perpendicular to the support surface. Also, the wall surface of the groove may be curved.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] The following is a summary of this disclosure. (Appendix 1) a light source unit including a base substrate, a first light-emitting element group and a second light-emitting element group arranged on the base substrate with a gap therebetween, and a first connection portion arranged in the gap and electrically connecting the first light-emitting element group and the second light-emitting element group; A light guide member that guides the light emitted from the light source unit; a support member for supporting the light guide member and to which the base substrate of the light source unit is fixed; a first restricting member disposed between the light guiding member and the base substrate and restricting a position of the light guiding member relative to the support member; the first light-emitting element group has a configuration in which a plurality of first light-emitting elements are connected in series so that a current flows along a first direction; the second light-emitting element group has a configuration in which a plurality of second light-emitting elements are connected in series so that a current flows along a second direction opposite to the first direction; In a plan view, the first restricting member is disposed so as to overlap the first connecting portion in the gap. Light source device.

[0173] According to the light source device of this configuration, the position where the first restricting member is arranged and the position of the gap are aligned, so that the space on the base substrate can be efficiently utilized, thereby realizing a compact device configuration. Also, for example, the position of the gap on the base substrate can be easily changed by adjusting the number of each light-emitting element constituting the first light-emitting element group and the second light-emitting element group without changing the total number of light-emitting elements constituting the first light-emitting element group and the second light-emitting element group. Therefore, according to this light source device, the device configuration can be made compact while increasing the degree of freedom in the arrangement of the restricting member.

[0174] (Appendix 2) the first connection portion has a first wiring that extends along a direction intersecting the first direction and includes a first portion connected to the second direction side of the first light-emitting element group, and a second wiring that extends along the first wiring and includes a second portion connected to the first direction side of the second light-emitting element group, and connects the first light-emitting element group and the second light-emitting element group. 2. A light source device as described in claim 1.

[0175] According to this configuration, the first light-emitting element group and the second light-emitting element group can be electrically connected via the first wiring and the second wiring of the first connection portion.

[0176] (Appendix 3) a second restricting member disposed between the light guiding member and the base substrate and configured to restrict a position of the light guiding member relative to the support member; The light source unit includes a third light-emitting element group and a fourth light-emitting element group that are arranged on the base substrate with a gap therebetween and are not electrically connected to the first light-emitting element group and the second light-emitting element group; a second connection portion electrically connecting the third light-emitting element group and the fourth light-emitting element group, the third light-emitting element group has a structure that is linearly symmetrical with respect to the first light-emitting element group, the fourth light-emitting element group has a structure that is linearly symmetrical with respect to the second light-emitting element group, the second connection portion has a structure that is axisymmetric with respect to the first connection portion, In a plan view, the second restricting member is disposed so as to overlap with the second connecting portion in the gap between the third light-emitting element group and the fourth light-emitting element group. 3. A light source device according to claim 1 or 2.

[0177] According to this configuration, by further providing the third light emitting element group and the fourth light emitting element group, the amount of light incident from the light source unit to the light guide member can be increased. Also, by aligning the position of the second restricting member with the position of the gap, the space on the base substrate can be efficiently utilized, thereby realizing a compact device configuration. Also, by further providing the second restricting member, the position of the light guide member relative to the support member can be well restricted.

[0178] (Appendix 4) the first light-emitting element group includes a plurality of first conductive patterns provided corresponding to the plurality of first light-emitting elements, respectively; Each of the plurality of first conductive patterns extends in a direction intersecting the first direction. 3. A light source device as described in claim 2.

[0179] According to this configuration, since the size of the first conductive pattern is larger than that of the first light-emitting element, the first conductive pattern can spread the heat of the first light-emitting element to the surroundings and transfer it to the base substrate side, thereby improving the heat dissipation of the first light-emitting element.

[0180] (Appendix 5) The plurality of first conductive patterns each extend in both directions intersecting the first direction with respect to the corresponding first light emitting element. 5. A light source device as described in claim 4.

[0181] According to this configuration, the area of ​​the first conductive pattern is increased, and therefore the heat dissipation property of the first light emitting element can be improved.

[0182] (Appendix 6) One first conductive pattern located at the front of the plurality of first conductive patterns arranged in the first direction is electrically connected to the first portion of the first wiring. 6. A light source device according to claim 4 or 5.

[0183] According to this configuration, it is possible to implement a configuration in which the first light-emitting element group and the first wiring are electrically connected.

[0184] (Appendix 7) the second light-emitting element group includes a plurality of second conductive patterns provided corresponding to the plurality of second light-emitting elements, respectively; Each of the plurality of second conductive patterns extends in a direction intersecting the second direction. 3. A light source device as described in claim 2.

[0185] According to this configuration, since the size of the second conductive pattern is larger than that of the second light-emitting element, the second conductive pattern can spread the heat of the second light-emitting element to the surroundings and transfer it to the base substrate side, thereby improving the heat dissipation of the second light-emitting element.

[0186] (Appendix 8) The plurality of second conductive patterns each extend in both directions intersecting the second direction with respect to the corresponding second light emitting element. 8. The light source device according to claim 7.

[0187] According to this configuration, the area of ​​the second conductive pattern is increased, and therefore the heat dissipation property of the second light emitting element can be improved.

[0188] (Appendix 9) one second conductive pattern located at the front of the plurality of second conductive patterns arranged in the second direction is electrically connected to the second portion of the second wiring, One second conductive pattern located at the rear end of the plurality of second conductive patterns arranged in the second direction is electrically connected to a ground pattern provided on the base substrate. 9. A light source device according to claim 7 or 8.

[0189] According to this configuration, in the second light-emitting element group, it is possible to realize a configuration in which a plurality of second light-emitting elements are connected in series so that a current flows along the second direction.

[0190] (Appendix 10) a terminal portion electrically connected to the first light-emitting element group and the second light-emitting element group, and disposed on the base substrate in a direction intersecting the first direction with respect to the first light-emitting element group and the second light-emitting element group; 10. A light source device according to any one of claims 1 to 9.

[0191] According to this configuration, by arranging the terminal portion on the base substrate in a direction intersecting the first direction in which the first light-emitting element group and the second light-emitting element group are arranged, it is possible to prevent the base substrate from becoming large in size in the first direction.

[0192] (Appendix 11) a protrusion provided on the base substrate or the support member for contacting the base substrate and the support member; the protrusion and the terminal portion are arranged on opposite sides of the first light-emitting element group and the second light-emitting element group, 11. The light source device according to claim 10.

[0193] According to this configuration, the convex portion is located on the opposite side of the terminal portion and can be arranged in an area with ample space, so that the space on the base substrate can be efficiently utilized to make the light source device more compact. In addition, the provision of the convex portion can suppress warping of the base substrate toward the light guide member, and can maintain an appropriate distance between the light source portion and the light guide member.

[0194] (Appendix 12) the base substrate has a connector portion electrically connected to the terminal portion, The support member has a notch provided at a position corresponding to the connector portion. 12. The light source device according to claim 11.

[0195] According to this configuration, for example, when the base substrate of the light source unit is fixed to the support member, the cutout portion can suppress interference with the connector portion provided on the base substrate.

[0196] (Appendix 13) the first light emitting element and the second light emitting element emit 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 first light emitting element and the second light emitting element into a second light having a second wavelength band different from the first wavelength band, and emits the second light. 13. A light source device according to any one of claims 1 to 12.

[0197] According to this configuration, it is possible to realize a light source device that has high utilization efficiency of the first light and obtains the second light having a desired intensity.

[0198] (Appendix 14) A light source device according to any one of claims 1 to 13; 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.

[0199] According to the projector having this configuration, since it is equipped with the above-mentioned light source device, it is possible to provide a projector with excellent light utilization efficiency. [Explanation of symbols]

[0200] 1...projector, 4B, 4G, 4R...light modulation device, 6...projection optical device, 100, 200, 300...light source device, 11...first wiring, 11a...connection portion (first portion), 12a...connection portion (second portion), 12...second wiring, 30...convex portion, 31, 131, 231...first light-emitting element, 32, 132, 232...second light-emitting element, 33...third light-emitting element, 34...fourth light-emitting element, 41a...first conductive pattern, 42a...second conductive pattern, 50...wavelength conversion member (light-guiding member), 54...support member, 70...light source portion, 71...base substrate, 72A...first group of light-emitting elements, 72B...second group of light-emitting elements, 72C...third group of light-emitting elements, 72D...fourth group of light-emitting elements, 73...light-emitting elements, 75...first connection portion, 76...second connection portion, 77...terminal portion, 78...connector portion, 191...first control member, 192...second control member, 548...notch portion, GP...ground pattern, S1, S2...gap, E...excitation light (first light), Y...fluorescence (second light).

Claims

1. a light source unit including a base substrate, a first light-emitting element group and a second light-emitting element group arranged on the base substrate with a gap therebetween, and a first connection portion arranged in the gap and electrically connecting the first light-emitting element group and the second light-emitting element group; A light guide member that guides the light emitted from the light source unit; a support member for supporting the light guide member and to which the base substrate of the light source unit is fixed; a first restricting member disposed between the light guiding member and the base substrate and restricting a position of the light guiding member relative to the support member; The first light-emitting element group has a configuration in which a plurality of first light-emitting elements are connected in series so that a current flows along a first direction, the second light-emitting element group has a configuration in which a plurality of second light-emitting elements are connected in series so that a current flows along a second direction opposite to the first direction; In a plan view, the first restricting member is disposed so as to overlap the first connecting portion in the gap. Light source device.

2. the first connection portion has a first wiring including a first portion extending along a direction intersecting the first direction and connected to the second direction side of the first light-emitting element group, and a second wiring including a second portion extending along the first wiring and connected to the first direction side of the second light-emitting element group, and connecting the first light-emitting element group and the second light-emitting element group, The light source device according to claim 1 .

3. a second restricting member disposed between the light guiding member and the base substrate and configured to restrict a position of the light guiding member relative to the support member; The light source unit includes a third light-emitting element group and a fourth light-emitting element group that are arranged on the base substrate with a gap therebetween and are not electrically connected to the first light-emitting element group and the second light-emitting element group; a second connection portion electrically connecting the third light-emitting element group and the fourth light-emitting element group, the third light-emitting element group has a structure that is linearly symmetrical with respect to the first light-emitting element group, the fourth light-emitting element group has a structure that is linearly symmetrical with respect to the second light-emitting element group, the second connection portion has a structure that is axisymmetric with respect to the first connection portion, In a plan view, the second restricting member is disposed so as to overlap the second connecting portion in the gap between the third light-emitting element group and the fourth light-emitting element group. The light source device according to claim 1 or 2.

4. the first light-emitting element group includes a plurality of first conductive patterns provided corresponding to the plurality of first light-emitting elements, respectively; Each of the plurality of first conductive patterns extends in a direction intersecting the first direction. The light source device according to claim 2 .

5. The plurality of first conductive patterns each extend in both directions intersecting the first direction with respect to a corresponding one of the first light emitting elements. The light source device according to claim 4 .

6. one first conductive pattern located at the front of the plurality of first conductive patterns arranged in the first direction is electrically connected to the first portion of the first wiring; 6. The light source device according to claim 4 or 5.

7. the second light-emitting element group includes a plurality of second conductive patterns provided corresponding to the plurality of second light-emitting elements, respectively; Each of the plurality of second conductive patterns extends in a direction intersecting the second direction. The light source device according to claim 2 .

8. The plurality of second conductive patterns each extend in both directions intersecting the second direction with respect to the corresponding second light emitting element. The light source device according to claim 7.

9. one second conductive pattern located at the front of the plurality of second conductive patterns arranged in the second direction is electrically connected to the second portion of the second wiring, One second conductive pattern located at the rear end of the plurality of second conductive patterns arranged in the second direction is electrically connected to a ground pattern provided on the base substrate.

9. The light source device according to claim 7 or 8.

10. a terminal portion electrically connected to the first light-emitting element group and the second light-emitting element group, and disposed on the base substrate in a direction intersecting the first direction with respect to the first light-emitting element group and the second light-emitting element group; The light source device according to claim 1 or 2.

11. a protrusion provided on the base substrate or the support member for contacting the base substrate and the support member; the protrusion and the terminal portion are disposed opposite each other with the first light-emitting element group and the second light-emitting element group interposed therebetween; The light source device according to claim 10.

12. the base substrate has a connector portion electrically connected to the terminal portion, The support member has a notch provided at a position corresponding to the connector portion. The light source device according to claim 11.

13. the first light emitting element and the second light emitting element emit 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 first light emitting element and the second 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 or 2.

14. The light source device according to claim 1 or 2, 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.

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