Light source device and projector

Abstract

A light source device and a projector. This light source device is provided with: a light source unit having: a base substrate; a first light-emitting element group and a second light-emitting element group disposed on the base substrate with a gap therebetween; the first connecting part is arranged in the gap and electrically connects the first light-emitting element group and the second light-emitting element group; a light guide member that guides light emitted from the light source unit; a support member that supports the light guide member and fixes the base substrate of the light source unit; and a first restricting member that configures the light guide member between the support member and the base substrate and restricts the position of the light guide member with respect to the support member. The first light-emitting element group has a structure in which a plurality of first light-emitting elements are connected in series such that a current flows in a first direction, and the second light-emitting element group has a structure in which a plurality of second light-emitting elements are connected in series such that a current flows in a second direction opposite to the first direction. The first restricting member is disposed so as to overlap the first connecting portion.

Description

Technical Field

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

[0002] As a light source device for a projector, a light source device that utilizes fluorescence emitted from a fluorescent body when excitation light emitted from a light-emitting element is irradiated onto the fluorescent body is proposed. Patent document 1 below discloses a light source device including: an excitation light source having a plurality of light-emitting elements mounted on a circuit board; a fluorescent body rod that converts excitation light emitted from each light-emitting element of the excitation light source into fluorescence; a holder that holds the fluorescent body rod; and a pressing member that presses the fluorescent body rod against the holder.

[0003] In the above light source device, a 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.

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

[0005] Patent Document 2: Japanese Patent Application Publication No. 2011-091256

[0006] Therefore, it is also considered to connect a plurality of light emitting elements in series on a circuit substrate by combining the technology of the above-mentioned patent document 2 with the light source device of the above-mentioned patent document 1. In such a structure in which a plurality of light emitting elements are connected in series, the circuit substrate is easily enlarged, and in order to prevent the pressing member from blocking the light emitted from the light emitting element, it is necessary to arrange the pressing member at a position that does not overlap with the light emitting element when viewed from above, so there is a problem that the degree of freedom of the arrangement location of the pressing member is low. Summary of the invention

[0007] In order to solve the above-mentioned problems, a light source device of one embodiment of the present invention comprises: a light source portion, which comprises: 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 connecting portion arranged in the gap and electrically connecting the first light-emitting element group and the second light-emitting element group; a light-guiding component, which guides light emitted from the light source portion; a supporting component, which supports the light-guiding component and fixes the base substrate of the light source portion; and a limiting component, which is arranged between the light-guiding component and the base substrate and limits the position of the light-guiding component relative to the supporting component, the first light-emitting element group having a structure in which a plurality of first light-emitting elements are connected in series in such a manner that current flows along a first direction, the second light-emitting element group having a structure in which a plurality of second light-emitting elements are connected in series in such a manner that current flows along a second direction opposite to the first direction, and in a plan view, the limiting component is arranged so as to overlap with the first connecting portion in the gap.

[0008] A projector according to one embodiment of the present invention comprises: a light source device according to one embodiment of the present invention; a light modulator that modulates light emitted from the light source device according to image information; and a projection optical device that projects the light modulated by the light modulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a diagram showing a schematic configuration of a projector according to the first embodiment.

[0010] Figure 2 It is a schematic structural diagram of the first lighting device.

[0011] Figure 3 It is a plan view showing a schematic structure of a light source unit.

[0012] Figure 4 is along Figure 3 Cross-sectional view taken along line IV-IV.

[0013] Figure 5 It is a plan view showing the circuit structure of the light source unit.

[0014] Figure 6 It is an enlarged view showing the main structure of the first light emitting element group and the second light emitting element group.

[0015] Figure 7 This is a top view of the light source device viewed from the Y-axis direction.

[0016] Figure 8 It is along Figure 7 A cross-sectional view of the light source device along line VIII-VIII.

[0017] Fig. 9 It is a plan view showing the main structure of the light source device according to the first modification.

[0018] Fig.10 It is a diagram showing a main part structure of a light source device according to a second modification.

[0019] Description of symbols

[0020] 1: projector, 4B, 4G, 4R: light modulator; 6: projection optical device; 100, 200, 300: light source device; 11: first wiring; 11a: connection part (first part); 12a: connection part (second part); 12: second wiring; 30: convex part; 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 component (light-guiding component); 54: supporting component; 70: light source portion; 71: base substrate; 72A: first light-emitting element group; 72B: second light-emitting element group; 72C: third light-emitting element group; 72D: fourth light-emitting element group; 73: light-emitting element; 75: first connecting portion; 76: second connecting portion; 77: terminal portion; 78: connector portion; 191: first limiting portion; 192: second limiting portion; 548: cutout portion; GP: ground pattern; S1, S2: gap; E: excitation light (first light); Y: fluorescence (second light). DETAILED DESCRIPTION

[0021] Hereinafter, one embodiment of the present invention will be described.

[0022] The projector of this embodiment is an example of a projector using a liquid crystal panel as a light modulation device.

[0023] In the following drawings, in order to make each component easier to see, the scale of the dimensions may be different depending on the component.

[0024] Figure 1 1 is a diagram showing a schematic configuration of a projector 1 according to the present embodiment.

[0025] like Figure 1 As shown, the projector 1 of this embodiment is a projection type image display device that displays a color image on a screen SCR as a projection surface. The projector 1 has three light modulators corresponding to the respective color lights of red light LR, green light LG, and blue light LB.

[0026] 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 synthesis element 5 , and a projection optical device 6 .

[0027] 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 modulator 4B. The detailed structures of the first illumination device 20 and the second illumination device 21 will be described later.

[0028] In the following, in the accompanying drawings, the XYZ vertical coordinate system is used for explanation as needed. 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 center 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 center 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 thereof is called the -X direction, one direction along the Y axis is called the +Y direction, and the opposite direction thereof is called the -Y direction, one direction along the Z axis is called the +Z direction, and the opposite direction thereof is called the -Z direction. In addition, the two directions along the X axis are not distinguished and are collectively referred to as the X axis direction, the two directions along the Y axis are not distinguished and are collectively referred to as the Y axis direction, and the two directions along the Z axis are not distinguished and are collectively referred to as the Z axis direction.

[0029] In this embodiment, the "+X direction" corresponds to the "first direction" in the claims, the "-X direction" corresponds to the "second direction" in the claims, and the +Z direction or the -Z direction corresponds to the "direction intersecting the first direction" in the claims.

[0030] 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 reflection mirror 8a, and a second reflection mirror 8b.

[0031] 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 reflector 8b is arranged in the optical path of the green light LG. The second reflector 8b reflects the green light LG reflected by the dichroic mirror 7 toward the light modulator 4G. The first reflector 8a is arranged in the optical path of the red light LR. The first reflector 8a reflects the red light LR transmitted by the dichroic mirror 7 toward the light modulator 4R.

[0032] On the other hand, the blue light LB emitted from the second illumination device 21 is reflected by the reflection mirror 9 toward the light modulation device 4B.

[0033] The second lighting 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 laser. In addition, the second light source 81 is not limited to a semiconductor laser, and can also be composed of an LED that emits blue light.

[0034] The condenser lens 82 is composed of a convex lens. The condenser lens 82 allows the blue light LB emitted from the second light source 81 to be incident on the diffuser plate 83 in a substantially converged state. The diffuser plate 83 diffuses the blue light LB emitted from the condenser lens 82 at a predetermined diffusion degree, and generates the blue light LB having a substantially uniform light distribution similar to the fluorescent light Y emitted from the first lighting device 20. As the diffuser plate 83, for example, frosted glass composed of optical glass is used.

[0035] The blue light LB diffused by the diffuser 83 is incident on the rod lens 84. The rod lens 84 has a prism shape extending along the optical axis AX2 direction of the second lighting device 21. The rod lens 84 has a light incident end face 84a provided at one end and a light emitting end face 84b provided at the other end. The diffuser 83 is fixed to the light incident end face 84a of the rod lens 84 via an optical adhesive (not shown). It is preferred that the refractive index of the diffuser 83 and the refractive index of the rod lens 84 are as consistent as possible.

[0036] The blue light LB is totally reflected and propagated inside the rod lens 84, and is emitted from the light emission end face 84b in a state where the uniformity of the illumination distribution is improved. The blue light LB emitted from the rod lens 84 is incident on the relay lens 85. The relay lens 85 allows the blue light LB, whose uniformity of illumination distribution is improved by the rod lens 84, to be incident on the reflector 9.

[0037] The shape of the light emitting end surface 84b of the rod lens 84 is a rectangle substantially similar to the shape of the image forming region of the light modulator 4B. Thus, the blue light LB emitted from the rod lens 84 is efficiently incident on the image forming region of the light modulator 4B.

[0038] The light modulator 4R modulates the red light LR according to the image information to form image light corresponding to the red light LR. The light modulator 4G modulates the green light LG according to the image information to form image light corresponding to the green light LG. The light modulator 4B modulates the blue light LB according to the image information to form image light corresponding to the blue light LB.

[0039] The light modulators 4R, 4G, and 4B each use a transmissive liquid crystal panel, for example. Polarizers (not shown) are disposed on the incident and exiting sides of the liquid crystal panel, respectively. The polarizer allows only linearly polarized light in a specific direction to pass through.

[0040] A field lens 10R is arranged on the incident side of the light modulator 4R. A field lens 10G is arranged on the incident side of the light modulator 4G. A field lens 10B is arranged on the incident side of the light modulator 4B. The field lens 10R collimates the principal ray of the red light LR incident on the light modulator 4R. The field lens 10G collimates the principal ray of the green light LG incident on the light modulator 4G. The field lens 10B collimates the principal ray of the blue light LB incident on the light modulator 4B.

[0041] The light synthesizing element 5 synthesizes the image lights corresponding to the red light LR, the green light LG, and the blue light LB by receiving the image lights emitted from the light modulators 4R, 4G, and 4B, and emits the synthesized image lights toward the projection optical device 6. The light synthesizing element 5 uses, for example, a cross dichroic prism.

[0042] The projection optical device 6 is composed of a plurality of projection lenses. The projection optical device 6 enlarges and projects the image light synthesized by the light synthesizing element 5 toward the screen SCR. Thus, a color image is displayed on the screen SCR.

[0043] Next, the structure of the first lighting device 20 will be described.

[0044] Figure 2 It is a schematic structural diagram of the first lighting device 20.

[0045] like Figure 2 As shown, the first illumination device 20 includes a light source device 100 , a parallelization optical system 63 , an integrating optical system 80 , a polarization conversion element 102 , and a superposition optical system 103 .

[0046] The light source device 100 includes a wavelength conversion member 50, a light source unit 70, an angle conversion member 52, a reflector 53, a support member 54, a holding member 65, and a pair of pressing members 91 and 92. The wavelength conversion member 50 of this embodiment corresponds to the "light guide member" in the claims.

[0047] The wavelength conversion component 50 has a quadrangular prism shape extending along the X-axis and has 6 faces. The side of the wavelength conversion component 50 extending along the X-axis is longer than the side extending along the Y-axis and the side extending along the Z-axis. Therefore, the X-axis corresponds to the long side of the wavelength conversion component 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 component 50 cut along the YZ plane perpendicular to the X-axis is a square. In addition, the cross-sectional shape of the wavelength conversion component 50 cut along the YZ plane may also be a rectangle.

[0048] The wavelength conversion component 50 has a first surface 50a and a second surface 50b, a third surface 50c and a fourth surface 50d, and a fifth surface 50e and a sixth surface 50f. The first surface 50a and the second surface 50b intersect the X-axis along the long side of the wavelength conversion component 50 and are located on opposite sides of each other on the X-axis. In the present embodiment, the first surface 50a is located on one side of the X-axis direction along the X-axis, that is, the +X side, and the second surface 50b is located on the opposite direction of the X-axis direction, that is, the -X side.

[0049] The third surface 50c and the fourth surface 50d intersect the first surface 50a and the second surface 50b, and are located on opposite sides of each other on the Y axis which intersects the X axis along the long side of the wavelength conversion member 50 and is perpendicular to the X axis in the present embodiment. In the present 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.

[0050] The fifth surface 50e and the sixth surface 50f intersect the third surface 50c and the fourth surface 50d, and are located on opposite sides of each other on the Z axis which intersects the X axis and the Y axis and is perpendicular to the X axis and the Y axis in the present embodiment. In the present 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.

[0051] In the following description, when the third surface 50c, the fourth surface 50d, the fifth surface 50e, and the sixth surface 50f are not distinguished, they may be simply referred to as side surfaces 50c, 50d, 50e, and 50f.

[0052] The wavelength conversion component 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 component 50 from the third surface 50c. The fluorescence Y is guided inside the wavelength conversion component 50 and then emitted from the first surface 50a. The excitation light E of this embodiment corresponds to the "first light" in the claims. The fluorescence Y of this embodiment corresponds to the "second light" in the claims.

[0053] The wavelength conversion member 50 includes a ceramic phosphor composed of a polycrystalline phosphor that converts the wavelength of the excitation light E into fluorescence Y. The second wavelength band of the fluorescence Y is, for example, a yellow wavelength band of 490 nm to 750 nm. That is, the fluorescence Y is yellow fluorescence containing red light components and green light components.

[0054] The wavelength conversion component 50 may also contain a single crystal phosphor instead of a polycrystalline phosphor. Alternatively, the wavelength conversion component 50 may also be made of fluorescent glass. Alternatively, the wavelength conversion component 50 may also be made of a material in which a plurality of fluorescent particles are dispersed in a binder made of glass or resin. The wavelength conversion component 50 made of such a material converts the excitation light E into fluorescent light Y.

[0055] Specifically, the material of the wavelength conversion member 50 contains, for example, yttrium aluminum garnet (YAG)-based phosphors. Taking YAG:Ce containing cerium (Ce) as an activator as an example, as the material of the wavelength conversion member 50, a phosphor containing Y 2 O 3 、Al 2 O 3 、CeO 3 Materials obtained by mixing raw material powders of constituent elements and subjecting them to a solid phase reaction, Y-Al-O amorphous particles obtained by a wet method such as a coprecipitation method and a sol-gel method, and YAG particles obtained by a gas phase method such as a spray drying method, a flame pyrolysis method, and a thermal plasma method.

[0056] 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.

[0057] The plurality of light emitting element groups 72 are provided on the first surface 71a of the base substrate 71. The light source unit 70 of the present embodiment includes the plurality of light emitting element groups 72, but the number of the light emitting element groups 72 is not particularly limited.

[0058] 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. The detailed structure of each of the light emitting element groups 72A, 72B, 72C, and 72D will be described later.

[0059] Each light emitting element group 72A, 72B, 72C, and 72D faces the third surface 50c of the wavelength conversion member 50 and emits excitation light E in 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.

[0060] In this way, the light source unit 70 is provided to face the third surface 50 c which is one of the four side surfaces 50 c , 50 d , 50 e , and 50 f along the longitudinal direction of the wavelength conversion member 50 .

[0061] Figure 3 It is a plan view showing a schematic structure of the light source unit 70 . Figure 31 is a plan view of the first surface 71 a of the base substrate 71 of the light source unit 70 .

[0062] like Figure 3 As shown, the base substrate 71 has a substantially rectangular shape. Each light emitting element group 72A, 72B, 72C, 72D is arranged on the first surface 71a of the base substrate 71. The base substrate 71 also has: a wiring group 74; a terminal portion 77, which is electrically connected to each light emitting element group 72A, 72B, 72C, 72D via the wiring group 74; a connector portion 78, which is 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.

[0063] The first light emitting element group 72A and the second light emitting element group 72B are arranged 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 arranged on the base substrate 71 with a gap S2 therebetween.

[0064] Therefore, no light emitting element of any light emitting element group is arranged in the gap S1 and the gap S2, and thus excitation light is not emitted from the gap S1 and the gap S2.

[0065] The terminal portion 77 includes a plurality of first terminals 77a and a plurality of second terminals 77b. The first terminal 77a is a terminal for current to flow in from an external device. The second terminal 77b is a terminal connected to the ground pattern GP of the base substrate 71 and is connected to the ground potential of the external device. The terminal portion 77 is arranged on the base substrate 71 on one side of the Z-axis direction intersecting the X-axis direction in which each light emitting element group 72A, 72B, 72C, 72D is arranged, that is, in the -Z direction.

[0066] The connector portion 78 electrically connects an external device to the light source portion 70. The connector portion 78 includes a terminal for connecting the terminal portion 77 to the external device. The connector portion 78 supplies the current supplied from the external device to each light emitting element group 72A, 72B, 72C, 72D via the terminal portion 77 and the wiring group 74. 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 later. The fixing portion 79 fixes the base substrate 71 to the support member 54 via a screw member. The fixing portion 79 is composed of a plurality of through holes for inserting screws, and in the case of this embodiment, four through holes 79a.

[0067] When the base substrate 71 is fixed to the support member 54, the protrusion provided on the support member 54 is inserted into the recess 60. For example, a thermistor is used as the first electronic component 66. For example, a varistor is used as the second electronic component 67.

[0068] The fixing portion 79 is provided at the outer peripheral edge of the base substrate 71. Specifically, four through holes 79a are respectively arranged at the corners of the rectangular base substrate 71. The fixing portion 79 fixes the light source portion 70 and the supporting member 54 so that each light emitting element group 72A, 72B, 72C, 72D provided on the first surface 71a of the base substrate 71 faces the wavelength conversion member 50.

[0069] Figure 4 is along Figure 3 Cross-sectional view taken along line IV-IV.

[0070] like Figure 4 As shown, the base substrate 71 of the light source unit 70 includes: a substrate 750 having a surface 750a and a back surface 750b; a first insulating layer 751, which is arranged on the surface 750a which is one side of the substrate 750; a conductive layer 752, which is stacked on the side of the first insulating layer 751 opposite to the substrate 750 and constitutes a part of the above-mentioned wiring group 74; a second insulating layer 753, which is stacked on the side of the first insulating layer 751 opposite to the substrate 750 in a manner covering the conductive layer 752; and a recess 754, which is arranged in the second insulating layer 753.

[0071] As a material of the substrate 750, aluminum having excellent heat dissipation properties is used, for example. The first insulating layer 751 and the second insulating layer 753 are formed of a resist film. The conductive layer 752 is formed of a pattern of gold, copper, aluminum, etc. The recess 754 is an opening that exposes a part of the first insulating layer 751, and constitutes the recess 60.

[0072] In this embodiment, the second surface 71b of the base substrate 71 refers to the back surface 750b of the substrate 750, and the first surface 71a of the base substrate 71 refers to the surface of the insulating layer and the wiring layer stacked on the surface 750a side of the substrate 750, which is the surface closest to the surface. Therefore, the first surface 71a of the base substrate 71 is not a flat surface, but a surface including concavities and convexities corresponding to the stacked structure of the insulating layer and the wiring layer. Each light emitting element group 72A, 72B, 72C, and 72D is electrically connected to the conductive layer 752 as described later.

[0073] Figure 5 FIG. 2 is a top view showing the circuit structure of the light source unit 70. Figure 5 In order to facilitate the understanding of the description, the Figure 3 The light source unit 70 shown is in a state where the second insulating layer 753 constituting the first surface 71 a of the base substrate 71 is removed.

[0074] like Figure 5As shown, the first light emitting element group 72A includes a plurality of first light emitting elements 31 and a first element conduction portion 41 that conducts each of 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 are connected in series via the first element conduction portion 41 so that current flows in the +X direction.

[0075] The second light emitting element group 72B includes a plurality of second light emitting elements 32 and a second element conduction portion 42 that conducts the second light emitting elements 32 to each other. The plurality of second light emitting elements 32 are connected in series via the second element conduction portion 42 so that current flows in the -X direction.

[0076] That is, the direction in which the current flows in the first light emitting element group 72A is opposite to the direction in which the current flows in the second light emitting element group 72B.

[0077] The third light emitting element group 72C has a structure that is line-symmetrical with the first light emitting element group 72A with reference to the central axis 71C that passes through the center of the base substrate 71 as an axis parallel to the Z axis. Specifically, the third light emitting element group 72C includes a plurality of third light emitting elements 33 and a third element conduction portion 43, and the plurality of third light emitting elements 33 are connected in series via the third element conduction portion 43 so that current flows in the -X direction.

[0078] The fourth light emitting element group 72D has a structure that is line-symmetrical with the second light emitting element group 72B with respect to the central axis 71C of the base substrate 71. Specifically, the fourth light emitting element group 72D includes a plurality of fourth light emitting elements 34 and a fourth element conduction portion 44, and the plurality of fourth light emitting elements 34 are connected in series via the fourth element conduction portion 44 so that current flows in the +X direction. That is, 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.

[0079] Thus, in the light source unit 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 line-symmetrically with respect to the central axis 71C of the base substrate 71 .

[0080] The wiring group 74 of the light source unit 70 includes a first connection portion 75 , a second connection portion 76 , and a ground pattern GP.

[0081] 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.

[0082] 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.

[0083] 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 .

[0084] The first connection portion 75 and the second connection portion 76 have the same structure. Therefore, the structure of the first connection portion 75 is taken as an example for description below.

[0085] 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.

[0086] The connection portion 11 a of the present embodiment corresponds to the “first portion” in the claims, and the connection portion 12 a corresponds to the “second portion” in the claims.

[0087] The connection portion 11a extends along the Z direction intersecting 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 routing portion 11b of the first wiring 11 is routed from the -Z direction of the connection portion 11a along the first light emitting element group 72A in the X-axis direction and is connected to the first terminal 77a of the terminal portion 77.

[0088] The connection part 12a of the second wiring 12 extends along the connection part 11a of the first wiring 11 and is connected to the +X side of the second light emitting element group 72B. Specifically, the connection part 12a is connected to the second element conduction part 42 of the second light emitting element group 72B. The routing part 12b of the second wiring 12 is routed from the connection part 12a along the first light emitting element group 72A in the +X direction and is connected to the +X side of the first light emitting element group 72A. Specifically, the routing part 12b is connected to the first element conduction part 41 of the first light emitting element group 72A.

[0089] Figure 6 2 is an enlarged view showing the main structure of the first light emitting element group 72A and the second light emitting element group 72B. Figure 6 As shown, in the first light emitting element group 72A, the first element conduction portion 41 has a plurality of first conductive patterns 41 a.

[0090] The plurality of first conductive patterns 41a extend in the Z-axis direction intersecting the +X direction. The plurality of first conductive patterns 41a are provided corresponding to the plurality of first light emitting elements 31. 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, etc., and is connected to a portion of the wiring group 74. Figure 4 A portion of the conductive layer 752 is shown correspondingly.

[0091] The plurality of first conductive patterns 41a are patterns separated from each other and have the same shape. The first conductive patterns 41a adjacent to each other in the X-axis direction do not contact each other.

[0092] 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, which protrude to both sides of the mounting portion 410; a pair of connecting portions 412, which connect the pair of protruding portions 411 and the mounting portion 410; and a pair of conductive portions 413, which are provided on the +X side of the pair of connecting portions 412 and are conductive to the first light emitting element 31 mounted on the adjacent first conductive pattern 41a. Therefore, the plurality of first conductive patterns 41a have a shape extending to both sides of the Z-axis direction with respect to the first light emitting element 31 corresponding to each other.

[0093] 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 arranged to enter the recess 412a of the connecting portion 412 of the first conductive pattern 41a on the other side (+X side). Thus, between the adjacent first conductive patterns 41a, each conductive portion 413 of the first conductive pattern 41a on one side (-X side) is arranged near the mounting portion 410 of the first conductive pattern 41a on the other side (+X side).

[0094] Each first light emitting element 31 is constituted by, for example, a light emitting diode (LED).

[0095] 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 arranged on the surface facing the opposite side of the base substrate 71, and the cathode electrode 31c is arranged on the back side facing the base substrate 71 side opposite to the surface. The first light emitting element 31 of this embodiment has two anode electrodes 31b in a manner of sandwiching the light emitting surface 31a, so that 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.

[0096] The light emitting surface 31a of the first light emitting element 31 is a surface that emits the excitation light E. Here, the left side (-X side) of the two first conductive patterns 41a adjacent to each other in the X-axis direction 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.

[0097] The first light emitting element 231 is mounted in a direction in which the cathode electrode 31c is placed on the mounting portion 410 of the first conductive pattern 241a. In addition, a solder layer is provided between the cathode electrode 31c and the mounting portion 410, for example.

[0098] 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. In addition, the metal wire 35 is provided by a wire bonding device.

[0099] Thus, the cathode electrode 31 c of the first light emitting element 131 mounted on the first conductive pattern 141 a and the anode electrode 31 b of the first light emitting element 231 mounted on the first conductive pattern 241 a are conductively connected to each other via the first conductive pattern 141 a .

[0100] Furthermore, between other first light emitting elements 31 adjacent to each other in the X-axis direction, the cathode electrode 31 c of one first light emitting element 31 and the anode electrode 31 b of the other first light emitting element 31 are also electrically connected.

[0101] The first conductive pattern 41a which is closest to the -X direction, i.e., the frontmost one of the plurality of first conductive patterns 41a arranged in the +X direction 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 frontmost first conductive pattern 41a 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 way, the frontmost first conductive pattern 41a 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. Therefore, the anode electrode 31b of the first light emitting element 31 which is closest to the -X direction in the first light emitting element group 72A can be supplied with current from an external device via the connector portion 78, the terminal portion 77, and the first wiring 11. In the first light emitting element group 72A, the plurality of first light emitting elements 31 are connected in series so that current flows along the +X direction.

[0102] The second light emitting element group 72B is connected in series with the first light emitting element group 72A. The second light emitting element group 72B has the same structure as the first light emitting element group 72A.

[0103] In the second light emitting element group 72B, the second element conductive portion 42 has a plurality of second conductive patterns 42a. The plurality of second conductive patterns 42a are patterns separated from each other and have the same shape. The plurality of second conductive patterns 42a extend in the Z-axis direction intersecting the -X direction. The plurality of second conductive patterns 42a are respectively arranged corresponding to the plurality of second light emitting elements 32, and the plurality of conductive patterns 42a extend in the Z-axis direction. That is, the number of second conductive patterns 42a is the same as the number of second light emitting elements 32. Each conductive pattern 42a is made of gold, copper, aluminum, etc., and is identical to the conductive pattern 42a that constitutes a part of the wiring group 74. Figure 4 A portion of the conductive layer 752 is shown correspondingly.

[0104] The plurality of second conductive patterns 42 a are patterns separated from each other, and the second conductive patterns 42 a adjacent to each other in the X-axis direction do not contact each other.

[0105] The second conductive pattern 42a includes: a mounting portion 420 for mounting the second light emitting element 32; a pair of extending portions 421 extending to both sides of the mounting portion 420; a pair of connecting portions 422 connecting the pair of extending portions 421 and the mounting portion 420; and a pair of conducting portions 423 provided on the -X side of the pair of connecting portions 422 and conducting with the second light emitting element 32 mounted on the adjacent second conductive pattern 42a. Therefore, the plurality of second conductive patterns 42a have a shape extending to both sides of the Z-axis direction with respect to the respective corresponding second light emitting elements 32.

[0106] 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 arranged so as to enter the recess 422a of the connecting portion 422 of the second conductive pattern 42a on the other side (-X side). Thus, between the adjacent second conductive patterns 42a, each conductive portion 423 of the second conductive pattern 42a on one side (+X side) is arranged near the mounting portion 420 of the second conductive pattern 42a on the other side (-X side).

[0107] Each second light emitting element 32 is formed of a light emitting diode (LED) similarly to the first light emitting element 31. Therefore, the second light emitting element 32 has a light emitting surface 32a, two anode electrodes 32b, and one cathode electrode 32c.

[0108] Here, the right side (+X side) of the two second conductive patterns 42a adjacent to each other in the X-axis direction 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.

[0109] The second light emitting element 232 is mounted in a direction such that 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.

[0110] Thus, the cathode electrode 32c of the second light emitting element 132 mounted on the second conductive pattern 142a and the anode electrode 32b of the second light emitting element 232 mounted on the second conductive pattern 242a are conductively connected to each other via the second conductive pattern 142a.

[0111] Furthermore, between other second light emitting elements 32 adjacent to each other in the X-axis direction, the cathode electrode 32 c of one second light emitting element 32 and the anode electrode 32 b of the other second light emitting element 32 are also electrically connected.

[0112] The second conductive pattern 42a closest to the +X direction, i.e., the frontmost one of the plurality of second conductive patterns 42a arranged in the -X direction 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 frontmost 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. Thus, the anode electrode 32b of the second light emitting element 32 mounted closest to the +X direction in the second light emitting element group 72B is electrically connected to the cathode electrode 31c of the first light emitting element 31 mounted closest to the +X direction in the first light emitting element group 72A via the second wiring 12.

[0113] The rearmost second conductive pattern 42a among the plurality of second conductive patterns 42a arranged in the -X direction is electrically connected to the 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 portions 45.

[0114] Therefore, in the second light emitting element group 72B, the plurality of second light emitting elements 32 have a structure in which they are connected in series so that current flows in the −X direction.

[0115] Each connection portion 45 is routed from both ends of the second conductive pattern 42a located at the rear in the Z-axis direction toward the inner side of the base substrate 71, that is, in the +X direction, and then connected to the ground pattern GP near the second wiring 12. Here, when the connection portion 45 connecting the second conductive pattern 42a and the ground pattern GP extends toward the outside of the base substrate 71, the size of the base substrate 71 may be further increased. In the case of the present embodiment, the connection portion 45 extends toward the inner side of the base substrate 71, so that the size of the base substrate 71 can be suppressed from being increased.

[0116] like Figure 5 As shown, the second connection portion 76 has a structure that is line-symmetrical with the first connection portion 75 with respect to the central axis 71C of the base substrate 71. Specifically, the second connection portion 76 includes the third wiring 13 and the 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.

[0117] 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 routing portion 13b of the third wiring 13 is routed 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.

[0118] 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 routing 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 is connected to the -X side of the third light emitting element group 72C. Specifically, the routing portion 14b is connected to the third element conduction portion 43 of the third light emitting element group 72C.

[0119] Based on such a structure, in the third light emitting element group 72C, the plurality of third light emitting elements 33 are connected in series so that current flows in the -X direction. In the fourth light emitting element group 72D, the plurality of fourth light emitting elements 34 are connected in series so that current flows in the +X direction.

[0120] return Figure 2The support member 54 has a groove 154 extending in the X-axis direction along the long side of the wavelength conversion member 50 and accommodating a part of the wavelength conversion member 50. The wavelength conversion member 50 is arranged inside the groove 154, and the heat generated by the wavelength conversion member 50 is diffused and released to the outside. Therefore, the support member 54 is preferably made of a material having a predetermined strength and high thermal conductivity. As the material of the support member 54, for example, a metal such as aluminum and stainless steel is used, and an aluminum alloy such as 6061 series is particularly preferably used. The specific structure of the support member 54 will be described later.

[0121] The wavelength conversion member 50 of the present embodiment includes a first protrusion 151 protruding from the groove 154 in the +X direction and a second protrusion 152 protruding from the groove 154 in the −X direction.

[0122] The holding member 65 holds the first protrusion 151 or the second protrusion 152 protruding from the groove 154 of the support member 54. Therefore, the wavelength conversion member 50 is in a state where a part thereof does not contact the wall surface of the groove 154 and protrudes to the outside of the groove 154 of the support member 54. The holding member 65 holds the portion of the wavelength conversion member 50 protruding to the outside of the groove 154. The holding member 65, together with the pair of pressing members 91 and 92, restricts the position of the wavelength conversion member 50 relative to the support member 54.

[0123] The pair of pressing members 91 and 92 restrict the position of the wavelength conversion member 50 relative to the support member 54 in the Y-axis direction inside the groove 154. The pressing member 91 corresponds to the "first restricting member" in the claims, and the pressing member 92 corresponds to the "second restricting member" in the claims.

[0124] The pair of pressing members 91 and 92 are arranged opposite to the supporting surface 54s of the groove 154. Thus, the pair of pressing members 91 and 92 restrict the wavelength conversion member 50 from moving in the Y-axis direction in the groove 154. The pair of pressing members 91 and 92 are made of a material that can be elastically deformed. As an example, the pair of pressing members 91 and 92 are made of a leaf spring made of a metal material, for example, a stainless steel material such as SUS304.

[0125] The pair of pressing members 91 and 92 are arranged 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 and 92 are fixed to the support member 54. In a plan view, the pair of pressing members 91 and 92 are arranged to overlap with the first connection portion 75 and the second connection portion 76 in the gaps S1 and S2, and the details will be described later.

[0126] The reflector 53 is provided on the second surface 50b of the wavelength conversion member 50. The reflector 53 guides light into the wavelength conversion member 50 and reflects the fluorescence Y reaching the second surface 50b. The reflector 53 is composed of a metal film or a dielectric multilayer film formed on the second surface 50b of the wavelength conversion member 50.

[0127] 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 fluorescent body contained in the wavelength conversion member 50 is excited, and the fluorescent light Y is emitted from any light-emitting point. The fluorescent light Y travels in all directions from any light-emitting point, and the fluorescent light Y traveling toward the four side surfaces 50c, 50d, 50e, and 50f is repeatedly totally reflected at a plurality of locations of the side surfaces 50c, 50d, 50e, and 50f, and travels toward the first surface 50a or the second surface 50b. The first surface 50a emits the fluorescent light Y that is propagated by total reflection and guided inside the wavelength conversion member 50. In the case of the present embodiment, the fluorescent light Y traveling toward the first surface 50a is incident on the angle conversion member 52 provided on the first surface 50a. The fluorescent light Y traveling toward the second surface 50b is reflected by the reflector 53 and travels toward the first surface 50a.

[0128] A portion of the excitation light E that is not used for exciting the fluorescent body among the excitation light E incident on the wavelength conversion member 50 is reflected by the components including the light source unit 70 around the wavelength conversion member 50 or the reflector 53 provided on the second surface 50b. Therefore, a portion of the excitation light E is confined inside the wavelength conversion member 50 and reused.

[0129] The angle conversion member 52 is provided on the first surface 50a of the wavelength conversion member 50. The angle conversion member 52 is constituted by, for example, a tapered rod. The angle conversion member 52 has a light incident surface 52a for incident fluorescent light Y emitted from the wavelength conversion member 50, a light exit surface 52b for emitting the fluorescent light Y, and a side surface 52c for reflecting the incident fluorescent light Y toward the light exit surface 52b.

[0130] The angle conversion member 52 has a quadrangular pyramid shape, and the cross-sectional area perpendicular to the optical axis J expands along the traveling direction of the light. Therefore, the area of ​​the light exit surface 52b is larger than the area of ​​the light incident surface 52a. An axis passing through the center of the light exit surface 52b and the light incident surface 52a and parallel to the X-axis is set as the optical axis J of the angle conversion member 52. In addition, the optical axis J of the angle conversion member 52 is consistent with the optical axis AX1 of the first lighting device 20.

[0131] The fluorescence Y incident on the angle conversion member 52 changes its direction so as to approach a direction parallel to the optical axis J whenever it is totally reflected at the side surface 52c while traveling inside the angle conversion member 52. 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 incident angle of the fluorescence Y on the light incident surface 52a.

[0132] Generally, the etendue of light, which is defined by the product of the area of ​​the light emission region and the maximum emission angle, which is the solid angle of the light, is preserved, and therefore the etendue of the fluorescence Y is also preserved before and after passing through the angle conversion member 52. As described above, the angle conversion member 52 has a structure in which the area of ​​the light emission surface 52b is larger than the area of ​​the light incident surface 52a. Therefore, from the viewpoint of preserving the etendue, the angle conversion member 52 can make the maximum emission angle of the fluorescence Y on the light emission surface 52b smaller than the maximum incident angle of the fluorescence Y on the light incident surface 52a.

[0133] The angle conversion member 52 is fixed to the wavelength conversion member 50 via an optical adhesive (not shown) in such a manner that the light incident surface 52a faces the first surface 50a of the wavelength conversion member 50. That is, the angle conversion member 52 is in contact with the wavelength conversion member 50 via the 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 enters the light incident surface 52a at an angle greater than the critical angle among the fluorescence Y that reaches the light incident surface 52a of the angle conversion member 52 is totally reflected by the light incident surface 52a and cannot enter the angle conversion member 52. In contrast, as in the present embodiment, when no gap is provided between the angle conversion member 52 and the wavelength conversion member 50, the loss component of the fluorescence Y that cannot enter the angle conversion member 52 due to total reflection can be reduced. From this point of view, it is preferable that the refractive index of the angle conversion member 52 and the refractive index of the wavelength conversion member 50 are as consistent as possible.

[0134] As the angle conversion member 52, a compound parabolic concentrator (CPC) may be used instead of the tapered rod. Even when the CPC is used as the angle conversion member 52, the same effect as when the tapered rod is used can be obtained. In addition, the light source device 100 does not necessarily have the angle conversion member 52.

[0135] The parallelization optical system 63 is composed of a collimating lens and the like, and is disposed between the light source device 100 and the integrator optical system 80. The parallelization optical system 63 further reduces the angular distribution of the fluorescence Y emitted from the light source device 100, so that the fluorescence Y with high parallelism is incident on the integrator optical system 80. In addition, when the parallelism of the fluorescence Y emitted from the angle conversion component 52 is sufficiently high, the parallelization optical system 63 may not be disposed.

[0136] The integrator optical system 80 includes a first lens array 61 and a second lens array 101. The integrator optical system 80 functions as a uniform illumination optical system that makes the intensity distribution of the fluorescence Y emitted from the light source device 100 uniform in each of the light modulators 4R and 4G as the illuminated area together with the superposition optical system 103. The fluorescence Y emitted from the parallelization optical system 63 is incident on the first lens array 61. The first lens array 61 and the second lens array 101 provided at the rear stage of the light source device 100 constitute the integrator optical system 80.

[0137] 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 lighting device 20. The plurality of first small lenses 61a divide the fluorescence Y emitted from the angle conversion component 52 into a plurality of partial light beams. The shape of each of the first small lenses 61a is a rectangular shape that is roughly similar to the shape of the image forming area of ​​the light modulating device 4R, 4G. As a result, the partial light beams emitted from the first lens array 61 are efficiently incident on the image forming areas of the light modulating devices 4R, 4G, respectively.

[0138] The fluorescence Y emitted from the first lens array 61 travels toward the second lens array 101. The second lens array 101 is arranged 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 overlapping optical system 103, images the plurality of first small lenses 61a of the first lens array 61 near the image forming areas of the light modulating devices 4R and 4G, respectively. 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 lighting device 20.

[0139] In the present embodiment, each first small lens 61a of the first lens array 61 and each second small lens 101a of the second lens array 101 have the same size as each other, but may also have different sizes from each other. In addition, in the present embodiment, the first small lens 61a of the first lens array 61 and the second small lens 101a of the second lens array 101 are arranged at positions where the optical axes are consistent with each other, but may also be arranged in a state of being eccentric to each other.

[0140] The polarization conversion element 102 converts the polarization direction of the fluorescence Y emitted from the second lens array 101. Specifically, the polarization conversion element 102 converts each partial beam of the fluorescence Y split by the first lens array 61 and emitted from the second lens array 101 into linearly polarized light.

[0141] The polarization conversion element 102 includes: a polarization separation layer not shown in the figure, which directly transmits one linear polarized light component of the polarized light components contained in the fluorescence Y emitted from the light source device 100, and reflects the other linear polarized light component in a direction perpendicular to the optical axis AX1; a reflective layer not shown in the figure, which reflects the other linear polarized light component after being reflected by the polarization separation layer in a direction parallel to the optical axis AX1; and a phase difference plate not shown in the figure, which converts the other linear polarized light component after being reflected by the reflective layer into one linear polarized light component.

[0142] The fluorescence Y transmitted through the polarization conversion element 102 enters the superimposing optical system 103. The superimposing optical system 103 cooperates with the integrator optical system 80 to form a uniform illumination optical system for uniformizing the intensity distribution of the fluorescence Y in each of the light modulating devices 4R and 4G as the illuminated areas.

[0143] In the light source device 100 of the present embodiment, when emitting the excitation light E, each light emitting element group 72A, 72B, 72C, 72D of the light source unit 70 generates heat. In each light emitting element group 72A, 72B, 72C, 72D, when the temperature of the light emitting element composed of the LED becomes higher, 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 luminous efficiency, and the longer the life can be achieved.

[0144] In the light source device 100 of the present embodiment, the light emitting elements of each light emitting element group 72A, 72B, 72C, and 72D are efficiently cooled. Hereinafter, the case of cooling the first light emitting element 31 of the first light emitting element group 72A will be described as an example.

[0145] For example, the heat of 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. Figure 6 As shown in FIG. 1 , the first conductive pattern 41a has a shape extending to both sides of the first light emitting element 31 in the Z-axis direction. Therefore, compared with 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 substrate 750 while diffusing it to the surroundings. Therefore, the first conductive pattern 41a can effectively cool the first light emitting element 31.

[0146] In addition, in the present embodiment, the plurality of first conductive patterns 41a all have the same shape. As a result, the heat dissipation performance of the first light-emitting element 31 at the first conductive pattern 41a is substantially uniform. Therefore, it is possible to prevent the cooling performance between the plurality of first light-emitting elements 31 from being easily deviated. By suppressing the temperature difference between the first light-emitting elements 31 in this way, it is possible to suppress the uneven illumination of the excitation light E emitted from the first light-emitting element group 72A.

[0147] The same can be said for the other light emitting element groups 72B, 72C, and 72D. Therefore, the second light emitting element 32, the third light emitting element 33, and the fourth light emitting element 34 can be efficiently cooled. In addition, the illuminance unevenness of the excitation light E emitted from each light emitting element group 72B, 72C, and 72D can be suppressed.

[0148] In the light source device 100 of the present embodiment, it is preferable to obtain bright fluorescence Y by making the excitation light E efficiently incident on the wavelength conversion member 50 .

[0149] In order to make the excitation light E efficiently incident on the wavelength conversion component 50, it is preferable to arrange the base substrate 71 and the wavelength conversion component 50 as close as possible. When the base substrate 71 and the wavelength conversion component 50 are brought close to each other, the pressing members 91 and 92 located between the wavelength conversion component 50 and the base substrate 71 may contact any one of the light emitting elements of each light emitting element group 72A, 72B, 72C, and 72D.

[0150] In contrast, in the case of the light source device 10 of the present embodiment, in a plan view, one pressing member 91 is arranged so as to overlap with the first connection portion 75 in the gap S1 provided on the base substrate 71, and the other pressing member 92 is arranged so as to overlap with the second connection portion 76 in the gap S2 provided on the base substrate 71. The gaps S1 and S2 are arranged line-symmetrically with respect to the central axis 71C of the base substrate 71, so that by aligning the center of the base substrate 71 with the center of the wavelength conversion member 50, the pair of pressing members 91 and 92 can be arranged in a well-balanced manner in the longitudinal direction of the wavelength conversion member 50 with respect to the center of the wavelength conversion member 50. Thus, the pair of pressing members 91 and 92 can stably hold the wavelength conversion member 50 in the groove 154.

[0151] As described above, no light emitting element is arranged in the gap S1 where the pressing member 91 is arranged, so the pressing member 91 does not block the light from the light emitting element. Similarly, no light emitting element is arranged in the gap S2 where the pressing member 92 is arranged, so the pressing member 92 does not block the light from the light emitting element.

[0152] In addition, the pressing member 91 enters the gap S1, thereby enabling the first light emitting element group 72A and the second light emitting element group 72B to be arranged closer to the wavelength conversion member 50 in the Y-axis direction. Similarly, the pressing member 92 enters the gap S2, thereby enabling the third light emitting element group 72C and the fourth light emitting element group 72D to be arranged closer to the wavelength conversion member 50 in the Y-axis direction.

[0153] In this way, the light source device 100 of this embodiment can efficiently utilize the space on the first surface 71 a of the base substrate 71 by aligning the positions of the pair of pressing members 91 and 92 with the positions of the gaps S1 and S2, thereby achieving further miniaturization of the device structure.

[0154] Therefore, according to the light source device 10 of the present embodiment, it is possible to realize a structure that generates bright fluorescence Y by making the excitation light E efficiently incident on the wavelength conversion member 50 while achieving a compact device structure.

[0155] Figure 7 is a top view of the light source device 100 as viewed from the Y-axis direction. Figure 7 In order to facilitate the viewing of the drawings, the light source unit 70 is indicated by a double-dashed line. Figure 7 In the figure, illustration of each light emitting element group 72A, 72B, 72C, and 72D is omitted.

[0156] like Figure 7 As shown in FIG. 1 , the light source device 100 of the present embodiment includes a convex portion 30 for making the base substrate 71 and the support member 54 abut against each other. Specifically, the convex portion 30 is provided on an opposing surface 30a of the support member 54 that is opposite to the first surface 71a of the base substrate 71. The convex portion 30 makes the base substrate 71 abut against the support member 54 when the light source unit 70 is separated from the support member 54 and the wavelength conversion member 50.

[0157] like Figure 3 As shown in FIG. 1 , the convex portion 30 and the terminal portion 77 are arranged opposite to each other across each light emitting element group 72A, 72B, 72C, and 72D. 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, and 72D. In this case, the convex portion 30 needs to be arranged at a position that does not interfere with the terminal portion 77. Therefore, in order to ensure a space for separately arranging the convex portion 30, the size of the base substrate 71 may be enlarged. In contrast, according to the structure of this embodiment, as shown in FIG. Figure 3 As shown, the protrusion 30 can be arranged on the side opposite to the terminal portion 77 and in a region with a surplus space. Therefore, by efficiently utilizing the space on the first surface 71 a of the base substrate 71 , the light source device 100 can be miniaturized.

[0158] In addition to the protrusion 30 , the support member 54 also has a spring fixing portion 540 , a first receiving portion 541 , a second receiving portion 542 , a third receiving portion 543 , a fourth receiving portion 544 , a fifth receiving portion 545 , a sixth receiving portion 546 , a light source fixing portion 547 and a cutout portion 548 .

[0159] The spring fixing parts 540 are arranged 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 and 92 arranged in a state of straddling the wavelength conversion member 50 in the Z-axis direction by screws 96. The cutouts 548 are used 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.

[0160] The convex portion 30 is arranged on the inner circumference side of the base substrate 71 than the fixing portion 79. Here, the inner circumference side of the base substrate 71 than the fixing portion 79 means the inner side than the imaginary line passing through the centers of the four through holes 79a constituting the fixing portion 79. In other words, the convex portion 30 is provided at a position closer to the center of the base substrate 71 than the fixing portion 79.

[0161] The projection 30 is a protruding body that projects in the -Y direction from the support member 54. The projection 30 may be formed integrally with the support member 54, or may be formed of a member different from the support member 54. In the present embodiment, the projection 30 is formed integrally with the support member 54.

[0162] When viewed from above in the Y direction, which is the normal direction of the opposing surface 30a of the support member 54, the convex portion 30 is arranged at a position that does not overlap with the light emitting elements of the light emitting element groups 72A, 72B, 72C, and 72D and does not abut against the wavelength conversion member 50. According to this structure, it is possible to suppress the occurrence of undesirable situations such as damage to the light emitting surface due to contact between the convex portion 30 and the light emitting surface of the light emitting element, and the convex portion 30 preventing the excitation light E emitted from the light emitting surface from entering the wavelength conversion member 50.

[0163] According to the light source device 100 of the present embodiment, the light source unit 70 and the support member 54 abut against each other via the convex portion 30 disposed between the base substrate 71 and the support member 54. The convex portion 30 functions as a spacer that limits the interval between the light source unit 70 and the support member 54 in the stacking direction of the light source unit 70 and the support member 54, that is, in the Y-axis direction. The convex portion 30 has at least a degree of rigidity that does not deform when sandwiched between the light source unit 70 and the support member 54.

[0164] When the base substrate 71 is fixed to the support member 54, that is, when the fixing portion 79 of the base substrate 71 is fixed to the light source fixing portion 547 of the support member 54 by screws, the protrusion 30 is inserted into the recess 60 formed on the first surface 71a of the base substrate 71. Figure 4 The first insulating layer 751 exposed in the recess 60 is shown to abut against it.

[0165] Here, the flatness of the first insulating layer 751 covering the surface 750a of the substrate 750 is higher than the flatness of the second insulating layer 753 covering the conductive layer 752. In the case of this embodiment, since the protrusion 30 abuts against the first insulating layer 751 having a higher flatness than the second insulating layer 753, the support member 54 and the base substrate 71 are well adhered to each other via the protrusion 30.

[0166] The height of the convex portion 30 in the Y direction is higher than the height of the pressing members 91 and 92 in the Y direction that abut against the third surface 50c of the wavelength conversion member 50. The convex portion 30 protrudes further toward the light source unit 70 than the pressing members 91 and 92, so that the pressing members 91 and 92 are separated from the light source unit 70. The pressing members 91 and 92 do not contact the first surface 71a of the base substrate 71 of the light source unit 70. Therefore, it is possible to suppress the pressure applied by the pressing members 91 and 92 to the first surface 71a. Figure 4 The conductive layer 752 shown in the figure may be disconnected or short-circuited.

[0167] 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. That is, the pedestal portions 547a of the light source fixing portion 547 and the through holes 79a of the fixing portion 79 are the same in number. An internal thread is provided on one pedestal portion 547a, and the internal thread fixes a screw inserted through the corresponding through hole 79a.

[0168] In the direction along the Y axis, the heights of the pedestals 547a are equal, and the heights of the protrusions 30 are substantially equal to the heights of the pedestals 547a. For example, when the gap between the light emitting elements of each light emitting element group 72A, 72B, 72C, 72D and the third surface 50c of the wavelength conversion member 50 is set to 0.3 mm, the tolerance between the pedestals 547a and the protrusions 30 is set to be less than ±0.1 mm.

[0169] In the case of the base substrate 71 of the present embodiment, as described above, the protrusion 30 abuts against the first insulating layer 751 exposed in the recess 60 , but the first insulating layer 751 is also exposed in the fixing portion 79 abutted against each pedestal portion 547 a at the same height as the protrusion 30 .

[0170] In this way, by making the heights of the seat portion 547a and the protrusion 30 consistent and making the seat portion 547a and the protrusion 30 abut against the first insulating layer 751, the base substrate 71 and the supporting member 54 are supported in a stable state by the protrusion 30 and the light source fixing portion 547 without shaking.

[0171] Figure 8 It is along Figure 7 4 is a cross-sectional view of the light source device 100 taken along line VIII-VIII.

[0172] like Figure 8 As shown, according to the light source device 100 of the present embodiment, the base substrate 71 and the support member 54 are in contact with each other by means of the convex portion 30 on the inner peripheral side of the fixing portion 79. Therefore, the base substrate 71 is prevented from warping toward the wavelength conversion member 50. Therefore, the light source device 100 of the present embodiment can make the excitation light E efficiently incident on the wavelength conversion member 50 to generate bright fluorescence Y by appropriately maintaining the distance between the light source unit 70 and the third surface 50c of the wavelength conversion member 50, and can prevent the occurrence of defects such as defects or damages caused by the contact between the light source unit 70 and the wavelength conversion member 50.

[0173] The groove portion 154 of the support member 54 has a U-shaped cross section perpendicular to the X-axis direction. The groove portion 154 has a support surface 54s, a first wall surface 54a, and a second wall surface 54b.

[0174] The support surface 54s corresponds to the bottom surface of the groove portion 154. In the case of the present embodiment, the support surface 54s is a surface extending parallel to the XZ plane, and supports the fourth surface 50d of the wavelength conversion component 50. The first wall surface 54a corresponds to one side surface of the groove portion 154, is opposite to the fifth surface 50e of the wavelength conversion component 50, and is separated 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 component 50. The second wall surface 54b corresponds to the other side surface of the groove portion 154, is opposite to the sixth surface 50f of the wavelength conversion component 50, and is separated 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 component 50.

[0175] 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 parallel to the direction perpendicular to the support surface 54s, that is, the XY plane. The second portion 54a2 is inclined so as to approach the fifth surface 50e as it approaches the support surface 54s side from the first portion 54a1 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.

[0176] 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 parallel to the direction perpendicular to the support surface 54s, that is, the XY plane. The fourth portion 54b4 is inclined so as to approach the sixth surface 50f as it approaches the support surface 54s side from the third portion 54b3 side. In other words, the distance between the fourth portion 54b4 on the support surface 54s side and the sixth surface 50f is smaller than the distance between the fourth portion 54b4 on the third portion 54b3 side and the sixth surface 50f.

[0177] The first wall surface 54a and the second wall surface 54b are respectively formed by the surface of a metal such as aluminum or stainless steel, which is a constituent material of the support member 54. More specifically, the first wall surface 54a and the second wall surface 54b are respectively formed by a surface obtained by mirror-finishing the above-mentioned metal surface. Therefore, the first wall surface 54a and the second wall surface 54b are respectively light reflective and reflect the incident excitation light E. In addition, the first wall surface 54a and the second wall surface 54b may also be respectively formed by other metal films or dielectric multilayer films formed on the surface of a metal such as aluminum or stainless steel.

[0178] As described above, the first wall surface 54a and the second wall surface 54b of the groove portion 154 need to be mirror-finished, so the portion where the groove portion 154 is provided requires processing accuracy compared to other portions in the support member 54. Therefore, the portion where the groove portion 154 is provided in the support member 54 may be formed by different components, and combined with different components that form portions other than the groove portion 154 to form one support member 54. That is, the support member 54 may also be formed by combining a plurality of components. In this way, since the peripheral portions of the groove portion 154 are formed by different components, the processability and processing accuracy of the first wall surface 54a and the second wall surface 54b of the groove portion 154 can be improved.

[0179] Hereinafter, when the light emitting elements of each light emitting element group 72A, 72B, 72C, and 72D are not particularly distinguished, they are simply referred to as light emitting elements 73. The dimension W1 of the light emitting elements 73 of each light emitting element group 72A, 72B, 72C, and 72D along the Z-axis direction is larger than the width B2 of the wavelength conversion member 50 along the Z-axis direction. In addition, the width of the wavelength conversion member 50 in the Z-axis direction of the present embodiment is equal throughout the length direction.

[0180] Thus, in the Z-axis direction, both ends of the light-emitting surface 73a of the light-emitting element 73 extend outward from the third surface 50c of the wavelength conversion component 50. Specifically, both ends of the light-emitting surface 73a of the light-emitting element 73 extend to a position overlapping 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. In other words, when the light-emitting surface 73a is observed from the support surface 54s along the Y-axis direction, a portion of the light-emitting surface 73a overlaps with the third surface 50c, and another portion 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.

[0181] The first width D2 of the support surface 54s of the support member 54 along the Z-axis direction is greater than the width B2 of the wavelength conversion member 50 along the Z-axis direction. Thus, in the Z-axis direction, both ends of the support surface 54s extend outward from the fourth surface 50d of the wavelength conversion member 50. In other words, when the support surface 54s is observed from the light emitting surface 73a along the Y-axis direction, a portion of the support surface 54s overlaps with the fourth surface 50d, and another portion of the support surface 54s is exposed outside the fourth surface 50d. In this way, the support surface 54s has an exposed portion exposed outside the wavelength conversion member 50.

[0182] According to the light source device 100 of the present 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 part 54a1, and then enters the second part 54a2 inclined with respect to the support surface 54s. At this time, the excitation light E2 is reflected by the second part 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 incident on the fifth surface 50e, so the amount of the excitation light E reflected by the support surface 54s and returned to the light source unit 70 side can be reduced. In addition, a part of the excitation light E is reflected by the first part 54a1 extending perpendicularly to the support surface 54s and enters the fifth surface 50e of the wavelength conversion member 50. As a result, it is possible to realize a light source device 100 in which the utilization efficiency of the excitation light E is high and the fluorescence Y having a desired intensity is easily obtained.

[0183] return Figure 7, the first receiving portion 541 is a recessed portion connected to the +X direction of the groove portion 154. The first receiving portion 541 penetrates to the outer edge 54d of the support member 54. The first receiving portion 541 receives the first protrusion 151 of the wavelength conversion member 50 that protrudes from the groove portion 154. In addition, the first receiving portion 541 holds the angle conversion member 52 fixed to the first surface 50a of the wavelength conversion member 50. In the present embodiment, the angle conversion member 52 fixed to the first surface 50a of the first protrusion 151 is held by the support member 54.

[0184] The light emitting surface 52 b of the angle conversion member 52 accommodated in the first accommodation portion 541 is flush with the outer edge 54 d of the support member 54 in a plan view.

[0185] The second storage portion 542 is a recessed portion connected to the -X direction of the groove portion 154. The second storage portion 542 penetrates to the outer edge 54d of the support member 54. The second storage portion 542 stores the second protrusion 152 of the wavelength conversion member 50 that protrudes from the groove portion 154. The second storage portion 542 is set in a state that is not connected to the outer edge 54d of the support member 54. The second storage portion 542 stores the second protrusion 152 of the wavelength conversion member 50 that protrudes from the groove portion 154. In the present embodiment, the reflector 53 is provided on the second surface 50b of the second protrusion 152. The second storage portion 542 stores the reflector 53 provided on the second surface 50b of the wavelength conversion member 50.

[0186] The third housing portion 543 is a recessed portion communicating in the +Z direction with the first housing portion 541. The third housing portion 543 houses the holding member 65 that holds the +Z side of the first protrusion 151 of the wavelength conversion member 50 housed in the first housing portion 541.

[0187] The fourth housing portion 544 is a recessed portion communicating with the -Z direction of the first housing portion 541. The fourth housing portion 544 houses the holding member 65 that holds the -Z side of the first protrusion 151 of the wavelength conversion member 50 housed in the first housing portion 541.

[0188] The fifth housing portion 545 is a recessed portion communicating with the second housing portion 542 in the +Z direction. The fifth housing portion 545 houses the holding member 65 that holds the +Z side of the second protruding portion 152 of the wavelength conversion member 50 housed in the second housing portion 542.

[0189] The sixth storage portion 546 is a recessed portion communicating in the −Z direction with the second storage portion 542. The sixth storage portion 546 stores the holding member 65 that holds the −Z side of the second protrusion 152 of the wavelength conversion member 50 stored in the second storage portion 542.

[0190] The pair of holding members 65 that sandwich the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 from both sides can adjust the positions of each other in the Z-axis direction.

[0191] In this way, the wavelength conversion member 50 of the present embodiment is held in the groove 154 in a state where the movement of the first protrusion 151 and the second protrusion 152 protruding to the outside of the groove 154 in the Z-axis direction is restricted by the holding member 65 .

[0192] As described above, the light source device 100 of the present embodiment includes: a light source section 70 including: a base substrate 71; a first light emitting element group 72A and a second light emitting element group 72B arranged on the base substrate 71 with a gap S1 therebetween; and a first connecting 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; a wavelength conversion member 50 that guides the excitation light E emitted from the light source section 70; a supporting member 54 that supports the wavelength conversion member 50 and fixes the base substrate 71 of the light source section 70; and a pressing member 91 that is arranged between the wavelength conversion member 50 and the base substrate 71 and restricts the position of the wavelength conversion member 50 relative to the supporting member 54. The first light emitting element group 72A has a structure in which a plurality of first light emitting elements 31 are connected in series so that current flows in the +X direction. The second light emitting element group 72B has a structure in which a plurality of second light emitting elements 32 are connected in series so that current flows in the -X direction. The pressing member 91 is arranged so as to overlap with the first connecting portion 75 in the gap S1 in a plan view.

[0193] According to the light source device 100 of the present embodiment, by aligning the position where the pressing member 91 is arranged with the position of the gap S1 , the space on the first surface 71 a of the base substrate 71 can be efficiently used, thereby achieving miniaturization of the device structure.

[0194] In addition, in the light source device 100 of the present embodiment, for example, by adjusting the number of 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 the present embodiment, it is possible to increase the degree of freedom of the arrangement location of the pressing member 91 and achieve miniaturization of the device structure.

[0195] The projector 1 of the present embodiment includes the small light source device 100 that efficiently extracts bright fluorescent light Y from the wavelength conversion member 50 , and therefore, a small projector with excellent light utilization efficiency can be provided.

[0196] (First Modification)

[0197] Hereinafter, a first modified example of the present embodiment will be described.

[0198] Fig. 9 1 is a plan view showing a main part structure of the light source device of the first modification. In the following drawings, the same reference numerals are given to the same components as those of the light source device 100 of the above-mentioned embodiment, and the description thereof is omitted.

[0199] In the case of the light source device 200 of this modification, for example, two first light emitting elements 131 are mounted on each first conductive pattern 41a of the first light emitting element group 72A. In addition, two light emitting elements are mounted on each conductive pattern of the other light emitting element groups 72B to 72D. The structure of the first light emitting element 131 is described below as an example.

[0200] The first light emitting element 131 is composed of a light emitting diode (LED) and has a light emitting surface 131a, an anode electrode 131b and a cathode electrode 131c. In the first light emitting element 131, the light emitting surface 131a and the anode electrode 131b are arranged on the surface opposite to the base substrate 71, and the cathode electrode 131c is arranged on the back side of the base substrate 71 opposite to the surface.

[0201] The anode electrode 131b of the first light emitting element 131 of this modification example 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 example, when the anode electrode 131b is electrically connected to the conductive portion 413 of the first conductive pattern 41a, a plurality of (in Fig. 9 There are 3 metal wires 35 in the middle.

[0202] According to this structure, current can be supplied to the light-emitting surface 131a of each first light-emitting element 131 via the three metal wires 35, so 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.

[0203] (Second Modification)

[0204] Hereinafter, a second modified example of the present embodiment will be described.

[0205] Fig.10 1 and 2 are diagrams showing a main part structure of a light source device according to a second modification. In the following drawings, the same reference numerals are given to the same components as those of the light source device 100 according to the above embodiment, and the description thereof is omitted.

[0206] In the above embodiment, the pair of pressing members 91 and 92 are provided on the support member 54 as the limiting member for limiting the position of the wavelength conversion member 50 relative to the groove 154 , but the present invention is not limited thereto.

[0207] like Fig.10 As shown, in the light source device 300 of this modified example, the first limiting member 191 and the second limiting member 192 are respectively arranged in the gaps S1 and S2 provided on the base substrate 71. The first limiting member 191 is arranged to overlap with the first connecting portion 75 in the gap S1, and the second limiting member 192 is arranged to overlap with the second connecting portion 76 in the gap S2. The third surface 50c of the wavelength conversion member 50 is pressed by the first limiting member 191 and the second limiting member 192, so that the fourth surface 50d abuts against the supporting surface 54s of the groove portion 154. Thus, the position of the wavelength conversion member 50 relative to the groove portion 154 is restricted.

[0208] The first limiting member 191 and the second limiting member 192 also function as a spacing member for maintaining the gap between the light source unit 70 and the wavelength conversion member 50 at a predetermined distance. The height of the first limiting member 191 and the second limiting member 192 is, for example, approximately 0.2 mm to 2 mm. The first limiting member 191 and the second limiting member 192 are preferably made of a material having excellent light resistance, such as metal or glass. The first limiting member 191 and the second limiting member 192 may also be formed directly on the first surface 71a of the base substrate 71 by a method such as screen printing.

[0209] In the light source device 300 of this modification, by aligning the positions of the first limiting member 191 and the second limiting 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 and the device structure can be miniaturized.

[0210] 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, it is possible to easily change the positions of the gaps S1 and S2 on the base substrate 71. Therefore, the degree of freedom in the arrangement position of the first limiting member 191 and the second limiting member 192 can be increased, and the device structure can be miniaturized.

[0211] In addition, the technical scope of the present invention is not limited to the above-mentioned embodiment, and various changes can be added within the scope not departing from the gist of the present invention.

[0212] For example, in the light source device 100 of the above embodiment, the case where the protrusion 30 is provided on the supporting member 54 is cited as an example, but the protrusion may also be provided on the first surface 71a of the base substrate 71. Alternatively, the light emitting element 73 may be separated from the supporting member 54 and the wavelength conversion member 50 by making the protrusions provided on the supporting member 54 and the first surface 71a of the base substrate 71 butt against each other.

[0213] 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 structure in which the convex portion is abutted against the first surface 71a of the base substrate 71 without the concave portion may be adopted. In this case, the upper surface of the base portion 547a of the support member 54 and the convex portion 30 may be aligned to the same height.

[0214] In the light source device 100 of the above embodiment, it is also possible to configure the base substrate 71 and the support member 54 to be fixed by screws at the convex portion 30. According to this structure, by increasing the number of fixing locations between the base substrate 71 and the support member 54, the light source unit 70 and the support member 54 can be fixed more firmly.

[0215] 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 as an example, but only the first protrusion 151 may be provided. In this case, the holding member 65 is arranged only on the first protrusion 151 side.

[0216] In the above embodiment, each wall surface of the groove portion 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 portion 154 is not particularly limited, for example, the entire area of ​​the wall surface of the groove portion may be perpendicular to the support surface. In addition, the wall surface of the groove portion may also be curved.

[0217] In the above embodiment, an example of applying the present invention to a light source device having a wavelength conversion component is given, but instead of this structure, the present invention can also be applied to a light source device that transmits incident light without wavelength conversion, for example, by controlling the angle distribution. In this case, the wavelength conversion component of the above embodiment replaces the light guide component, and the light emitted from the light emitting element is emitted from the angle conversion component as light of the original wavelength band.

[0218] In addition, the specific description of the shape, quantity, configuration, material, etc. of each component of the light source device and the projector is not limited to the above-mentioned embodiment and can be appropriately changed. In addition, in the above-mentioned embodiment, an example of mounting the light source device of the present invention on a projector using a liquid crystal panel is shown, but it is not limited to this. The light source device of the present invention can also be applied to a projector using a digital micromirror device as a light modulator. In addition, the projector may not have multiple light modulators, but may only have one light modulator.

[0219] In the above-mentioned embodiment, an example in which the light source device of the present invention is applied to a projector is shown, but the present invention is not limited thereto and can also be applied to lighting equipment, a headlight of a car, and the like.

[0220] The following is a summary of the present disclosure.

[0221] (Note 1)

[0222] A light source device comprises: a light source portion, which comprises: 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 connecting portion arranged in the gap and electrically connecting the first light-emitting element group and the second light-emitting element group; a light-guiding component which guides light emitted from the light source portion; a supporting component which supports the light-guiding component and fixes the base substrate of the light source portion; and a first limiting component which is arranged between the light-guiding component and the base substrate and limits the position of the light-guiding component relative to the supporting component, the first light-emitting element group having a structure in which a plurality of first light-emitting elements are connected in series in such a manner that current flows in a first direction, the second light-emitting element group having a structure in which a plurality of second light-emitting elements are connected in series in such a manner that current flows in a second direction opposite to the first direction, and in a plan view, the first limiting component is arranged so as to overlap with the first connecting portion in the gap.

[0223] According to the light source device of this structure, by making the position where the first limiting member is arranged consistent with the position of the gap, the space on the base substrate can be efficiently used, thereby realizing the miniaturization of the device structure. In addition, for example, 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, the position of the gap on the base substrate can be easily changed. Therefore, according to this light source device, the degree of freedom of the configuration location of the limiting member can be increased and the device structure can be miniaturized.

[0224] (Note 2)

[0225] A light source device according to Note 1, wherein the first connecting portion comprises: 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, the second wiring connecting the first light-emitting element group with the second light-emitting element group.

[0226] According to this structure, 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.

[0227] (Note 3)

[0228] A light source device according to Note 1 or 2, wherein the light source device further comprises a second limiting component, which is arranged between the light guiding component and the base substrate to limit the position of the light guiding component relative to the supporting component, and the light source portion further comprises: a third light emitting element group and a fourth light emitting element group, which 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; and a second connecting portion, which electrically connects the third light emitting element group with the fourth light emitting element group, the third light emitting element group has a structure that is linearly symmetrical with the first light emitting element group, the fourth light emitting element group has a structure that is linearly symmetrical with the second light emitting element group, and the second connecting portion has a structure that is linearly symmetrical with the first connecting portion, and in a plan view, the second limiting component is arranged to overlap with the second connecting portion in the gap between the third light emitting element group and the fourth light emitting element group.

[0229] According to this structure, by also having a third light emitting element group and a fourth light emitting element group, the amount of light incident from the light source portion to the light guide member can be increased. In addition, by making the position of the second limiting member consistent with the position of the gap, the space on the base substrate can be efficiently utilized, thereby achieving miniaturization of the device structure. In addition, by also having a second limiting member, the position of the light guide member relative to the supporting member can be well limited.

[0230] (Note 4)

[0231] The light source device according to Supplement 2, wherein the first light-emitting element group includes a plurality of first conductive patterns respectively arranged corresponding to the plurality of first light-emitting elements, and the plurality of first conductive patterns respectively extend in a direction intersecting the first direction.

[0232] According to this structure, since the first conductive pattern is larger than the first light emitting element, the first conductive pattern can transfer the heat of the first light emitting element to the base substrate while diffusing it to the surroundings. Therefore, the first conductive pattern can improve the heat dissipation of the first light emitting element.

[0233] (Note 5)

[0234] The light source device according to Supplement 4, wherein the plurality of first conductive patterns extend in two directions intersecting the first direction relative to the first light-emitting elements respectively corresponding thereto.

[0235] According to this structure, the area of ​​the first conductive pattern is further increased, so the heat dissipation of the first light emitting element can be further improved.

[0236] (Note 6)

[0237] The light source device according to Supplementary Note 4 or 5, wherein a 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.

[0238] According to this structure, it is possible to implement a structure in which the first light emitting element group is electrically connected to the first wiring.

[0239] (Note 7)

[0240] The light source device according to Supplement 2, wherein the second light emitting element group includes a plurality of second conductive patterns respectively arranged corresponding to the plurality of second light emitting elements, and the plurality of second conductive patterns respectively extend in a direction intersecting the second direction.

[0241] According to this structure, since the second conductive pattern is larger than the second light emitting element, the second conductive pattern can transfer the heat of the second light emitting element to the base substrate while diffusing it to the surroundings. Therefore, the second conductive pattern can improve the heat dissipation of the second light emitting element.

[0242] (Note 8)

[0243] A light source device according to Supplementary Note 7, wherein the plurality of second conductive patterns extend in two directions intersecting the second direction relative to the second light emitting elements respectively corresponding thereto.

[0244] According to this structure, the area of ​​the second conductive pattern is further increased, so the heat dissipation of the second light emitting element can be further improved.

[0245] (Note 9)

[0246] A light source device according to Note 7 or 8, wherein a second conductive pattern located at the front among the multiple second conductive patterns arranged in the second direction is electrically connected to the second portion of the second wiring, and a second conductive pattern located at the rear among the multiple second conductive patterns arranged in the second direction is electrically connected to a ground pattern provided on the base substrate.

[0247] According to this configuration, in the second light emitting element group, a structure in which a plurality of second light emitting elements are connected in series so that current flows in the second direction can be realized.

[0248] (Note 10)

[0249] A light source device according to any one of Notes 1 to 9, wherein the light source device further has a terminal portion, which is electrically connected to the first light-emitting element group and the second light-emitting element group, and is arranged in a direction intersecting the first direction relative to the first light-emitting element group and the second light-emitting element group on the base substrate.

[0250] 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 suppress an increase in size of the base substrate in the first direction.

[0251] (Note 11)

[0252] A light source device according to Note 10, wherein the light source device further comprises a convex portion, which is arranged on the base substrate or the supporting member so that the base substrate abuts against the supporting member, and the convex portion and the terminal portion are arranged opposite to each other across the first light-emitting element group and the second light-emitting element group.

[0253] According to this structure, the convex portion is located on the side opposite to the terminal portion and can be arranged in an area with a surplus space, so that the light source device can be further miniaturized by efficiently utilizing the space on the base substrate. In addition, by having the convex portion, the warping of the base substrate toward the light guide component side can be suppressed, and the distance between the light source portion and the light guide component can be appropriately maintained.

[0254] (Note 12)

[0255] The light source device according to Supplementary note 11, wherein the base substrate has a connector portion electrically connected to the terminal portion, and the support member has a cutout portion provided at a position corresponding to the connector portion.

[0256] According to this configuration, for example, when the base substrate of the light source unit is fixed to the supporting member, interference with the connector unit provided on the base substrate can be suppressed by the cutout portion.

[0257] (Note 13)

[0258] A light source device according to any one of Notes 1 to 12, wherein the first light emitting element and the second light emitting element emit first light having a first wavelength band, and the light guiding component is a wavelength conversion component, which contains a phosphor, converts the first light emitted from the first light emitting element and the second light emitting element into second light having a second wavelength band different from the first wavelength band, and emits the second light.

[0259] According to this configuration, it is possible to realize a light source device that has high utilization efficiency of the first light and can obtain the second light having a desired intensity.

[0260] (Note 14)

[0261] A projector comprising: a light source device as described in any one of Notes 1 to 13; a light modulation device that modulates light emitted from the light source device according to image information; and a projection optical device that projects the light modulated by the light modulation device.

[0262] According to the projector having this configuration, since it includes the above-mentioned light source device, it is possible to provide a projector having excellent light utilization efficiency.

Claims

1. A light source device, comprising: The light source unit comprises: a base substrate; a first light emitting element group and a second light emitting element group disposed on the base substrate with a gap therebetween; and a first connection portion disposed in the gap and electrically connecting the first light emitting element group and the second light emitting element group; a light guide member for guiding the light emitted from the light source portion; a supporting member that supports the light guide member and fixes the base substrate of the light source unit; as well as a first limiting member disposed between the light guide member and the base substrate and limiting a position of the light guide member relative to the supporting member; The first light emitting element group has a structure in which a plurality of first light emitting elements are connected in series so that current flows in a first direction. The second light emitting element group has a structure in which a plurality of second light emitting elements are connected in series so that current flows in a second direction opposite to the first direction. The first restriction member is arranged so as to overlap with the first connection portion in the gap in a plan view.

2. The light source device according to claim 1, wherein: The first connecting portion has: a first wiring including a first portion extending in a direction intersecting the first direction and connected to the second direction side of the first light emitting element group; as well as The second wiring includes a second portion, the second portion extends along the first wiring and is connected to the first direction side of the second light emitting element group, and the second wiring connects the first light emitting element group and the second light emitting element group.

3. The light source device according to claim 1 or 2, wherein: The light source device further includes a second limiting member, which is disposed between the light guide member and the base substrate and limits the position of the light guide member relative to the support member. The light source unit also has: A third light emitting element group and a fourth light emitting element group, which 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; as well as 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 line symmetrical with the first light emitting element group. The fourth light emitting element group has a structure that is line symmetrical with the second light emitting element group. The second connection portion has a structure that is line symmetrical with the first connection portion. The second limiting member is arranged so as to overlap with the second connection portion in the gap between the third light emitting element group and the fourth light emitting element group in a plan view.

4. The light source device according to claim 2, wherein: The first light emitting element group includes a plurality of first conductive patterns respectively arranged corresponding to the plurality of first light emitting elements. The plurality of first conductive patterns extend in directions intersecting the first direction, respectively.

5. The light source device according to claim 4, wherein: The plurality of first conductive patterns extend in two directions intersecting the first direction relative to the first light emitting elements respectively corresponding thereto.

6. The light source device according to claim 4 or 5, wherein: A 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.

7. The light source device according to claim 2, wherein: The second light emitting element group includes a plurality of second conductive patterns respectively arranged corresponding to the plurality of second light emitting elements. The plurality of second conductive patterns extend in directions intersecting the second direction, respectively.

8. The light source device according to claim 7, wherein: The plurality of second conductive patterns extend in two directions intersecting the second direction relative to the second light emitting elements respectively corresponding thereto.

9. The light source device according to claim 7 or 8, wherein: A 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 rearmost of the plurality of second conductive patterns arranged in the second direction is electrically connected to a ground pattern provided on the base substrate.

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

11. The light source device according to claim 10, wherein: The light source device further includes a convex portion, which is provided on the base substrate or the support member so that the base substrate abuts against the support member. The convex portion and the terminal portion are arranged opposite to each other across the first light emitting element group and the second light emitting element group.

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

13. The light source device according to claim 1 or 2, wherein: The first light emitting element and the second light emitting element emit first light having a first wavelength band. The light guide member is a wavelength conversion member that contains a fluorescent substance, converts the first light emitted from the first light emitting element and the second light emitting element into second light having a second wavelength band different from the first wavelength band, and emits the second light.

14. A projector, comprising: The light source device according to claim 1 or 2; a light modulation device for modulating light emitted from the light source device according to image information; and A projection optical device projects the light modulated by the light modulation device.

Images