Light source device and projector

Abstract

To provide a light source device that can efficiently cool a plurality of light-emitting elements, and a projector.SOLUTION: A light source device of the present invention comprises: a plurality of light-emitting elements including first and second light-emitting elements; and a heat sink formed of a plurality of radiators including first and second radiators. The heat sink holds the plurality of light-emitting elements that are in electrical serial connection. The first light-emitting element has a first surface including a first light-emitting area and a second surface including at least one electrode. The second light-emitting element has a third surface including a second light-emitting area and a fourth surface including at least one electrode. The first radiator has a first support part supporting the second surface and electrically connected with the first light-emitting element, and a first radiation fin. The second radiator has a second support part supporting the fourth surface and electrically connected with the second light-emitting element, and a second radiation fin. The first and second light-emitting elements are electrically connected through the first support part and second support part.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] Patent Document 1 listed below discloses a light source device in which a through hole is formed in a part of a substrate that supports a light emitting element, thereby enabling heat generated in the light emitting element to be efficiently discharged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-147744 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the above light source device, since a plurality of light emitting elements are mounted on a substrate, there is room for improvement in the heat dissipation properties of each light emitting element. [Means for solving the problem]

[0005] In order to solve the above problems, a light source device according to one embodiment of the present invention comprises a plurality of light-emitting elements including a first light-emitting element and a second light-emitting element, and a heat sink composed of a plurality of heat sinks including a first heat sink and a second heat sink, the heat sink holding the plurality of light-emitting elements in a state in which they are electrically connected in series, the first light-emitting element having a first surface including a first light-emitting region and a second surface provided on the opposite side to the first surface and including at least one electrode, the second light-emitting element having a third surface including a second light-emitting region and a fourth surface provided on the opposite side to the third surface and including at least one electrode, The first heat sink has a first support portion that supports the second surface of the first light-emitting element and is electrically connected to the first light-emitting element, and a first heat dissipation fin extending on the side of the first support portion opposite the first light-emitting element, and the second heat sink has a second support portion that supports the fourth surface of the second light-emitting element and is electrically connected to the second light-emitting element, and a second heat dissipation fin extending on the side of the second support portion opposite the second light-emitting element, and the first light-emitting element and the second light-emitting element are electrically connected via the first support portion of the first heat sink and the second support portion of the second heat sink.

[0006] A projector of one embodiment of the present invention comprises a light source device of one embodiment of the present invention, a light modulation device that modulates light emitted from the light source device in accordance with image information, and a projection optical device that projects the light modulated by the light modulation device. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a projector according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram illustrating the configuration of a first lighting device. [Diagram 3] FIG. 2 is a perspective view showing a schematic configuration of a light source unit. [Figure 4] 4 is a cross-sectional view of the light source unit taken along line IV-IV in FIG. 3. [Diagram 5] 4 is a plan view of the light source device as viewed from the Y-axis direction. FIG. [Figure 6]6 is a cross-sectional view of the light source device taken along line VI-VI in FIG. 5. [Figure 7] FIG. 4 is a cross-sectional view of a light source device according to a first modified example. [Figure 8] FIG. 11 is a cross-sectional view of a light source device according to a second modified example. [Figure 9] FIG. 11 is a cross-sectional view showing another embodiment of the light source unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, one embodiment of the present invention will be described. The projector of this embodiment is an example of a projector that uses a liquid crystal panel as a light modulation device. In the drawings, the dimensions of the components may be shown on different scales in order to make the components easier to see.

[0009] FIG. 1 is a diagram showing a schematic configuration of a projector 1 according to the present embodiment. 1, the projector 1 of this embodiment is a projection type image display device that displays a color image on a screen SCR, which is a projection surface. The projector 1 includes three light modulation devices corresponding to the respective colors of red light LR, green light LG, and blue light LB.

[0010] The projector 1 includes a first illumination device 20, a second illumination device 21, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a light combining element 5, and a projection optical device 6.

[0011] The first illumination device 20 emits yellow fluorescence Y toward the color separation optical system 3. The second illumination device 21 emits blue light LB toward the light modulation device 4B. Detailed configurations of the first illumination device 20 and the second illumination device 21 will be described later.

[0012] In the following, in the drawings, an XYZ Cartesian coordinate system is used for explanation as necessary. The Z axis is an axis along the top and bottom of the projector 1. The X axis is an axis parallel to the optical axis AX1 of the first lighting device 20 and the optical axis AX2 of the second lighting device 21. The Y axis is an axis perpendicular to the X axis and the Z axis. The optical axis AX1 of the first lighting device 20 is the central axis of the fluorescent light Y emitted from the first lighting device 20. The optical axis AX2 of the second lighting device 21 is the central axis of the blue light LB emitted from the second lighting device 21. One direction along the X axis is called the +X direction, and the opposite direction is called the -X direction, one direction along the Y axis is called the +Y direction, and the opposite direction is called the -Y direction, one direction along the Z axis is called the +Z direction, and the opposite direction is called the -Z direction. In addition, the two directions along the X-axis will not be distinguished from one another and will be collectively referred to as the X-axis direction, the two directions along the Y-axis will not be distinguished from one another and will be collectively referred to as the Y-axis direction, and the two directions along the Z-axis will not be distinguished from one another and will be collectively referred to as the Z-axis direction.

[0013] The color separation optical system 3 separates the yellow fluorescence Y emitted from the first illumination device 20 into red light LR and green light LG. The color separation optical system 3 includes a dichroic mirror 7, a first reflecting mirror 8a, and a second reflecting mirror 8b.

[0014] The dichroic mirror 7 separates the fluorescence Y into red light LR and green light LG. The dichroic mirror 7 transmits the red light LR and reflects the green light LG. The second reflecting mirror 8b is disposed in the optical path of the green light LG. The second reflecting mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the optical modulation device 4G. The first reflecting mirror 8a is disposed in the optical path of the red light LR. The first reflecting mirror 8a reflects the red light LR transmitted through the dichroic mirror 7 toward the optical modulation device 4R.

[0015] On the other hand, the blue light LB emitted from the second illumination device 21 is reflected by the reflecting mirror 9 towards the light modulation device 4B.

[0016] The second illumination device 21 includes a light source unit 111, a condenser lens 112, a diffusion plate 113, a rod lens 114, and a relay lens 115. The light source unit 111 is composed of at least one semiconductor laser. The light source unit 111 emits blue light LB composed of a laser beam. The light source unit 111 is not limited to a semiconductor laser, and may be composed of an LED that emits blue light.

[0017] The condenser lens 112 is composed of a convex lens. The condenser lens 112 causes the blue light LB emitted from the light source unit 111 to enter the diffusion plate 113 in a substantially condensed state. The diffusion plate 113 diffuses the blue light LB emitted from the condenser lens 112 with a predetermined diffusion degree, and generates blue light LB having a substantially uniform light distribution similar to that of the fluorescence Y emitted from the first lighting device 20. As the diffusion plate 113, for example, ground glass made of optical glass is used.

[0018] The blue light LB diffused by the diffusion plate 113 is incident on the rod lens 114. The rod lens 114 has a prismatic shape extending along the optical axis AX2 direction of the second illumination device 21. The rod lens 114 has a light incident end surface 114a provided at one end and a light exit end surface 114b provided at the other end. The diffusion plate 113 is fixed to the light incident end surface 114a of the rod lens 114 via an optical adhesive (not shown). It is desirable to match the refractive index of the diffusion plate 113 and the refractive index of the rod lens 114 as closely as possible.

[0019] The blue light LB is propagated while being totally reflected inside the rod lens 114, and is emitted from the light emitting end surface 114b with the uniformity of the illuminance distribution being enhanced. The blue light LB emitted from the rod lens 114 is incident on the relay lens 115. The relay lens 115 causes the blue light LB, whose uniformity of the illuminance distribution has been enhanced by the rod lens 114, to be incident on the reflecting mirror 9.

[0020] The shape of the light exit end surface 114b of the rod lens 114 is a rectangle that is approximately similar to the shape of the image forming area of ​​the light modulation device 4B. This allows the blue light LB exiting from the rod lens 114 to efficiently enter the image forming area of ​​the light modulation device 4B.

[0021] The light modulation device 4R modulates the red light LR according to image information to form image light corresponding to the red light LR. The light modulation device 4G modulates the green light LG according to image information to form image light corresponding to the green light LG. The light modulation device 4B modulates the blue light LB according to image information to form image light corresponding to the blue light LB.

[0022] For example, a transmissive liquid crystal panel is used for each of the light modulation devices 4R, 4G, and 4B. A polarizing plate (not shown) is disposed on the entrance side and exit side of each of the liquid crystal panels. The polarizing plate transmits only linearly polarized light in a specific direction.

[0023] A field lens 10R is disposed on the incident side of the optical modulation device 4R. A field lens 10G is disposed on the incident side of the optical modulation device 4G. A field lens 10B is disposed on the incident side of the optical modulation device 4B. The field lens 10R collimates the chief ray of the red light LR incident on the optical modulation device 4R. The field lens 10G collimates the chief ray of the green light LG incident on the optical modulation device 4G. The field lens 10B collimates the chief ray of the blue light LB incident on the optical modulation device 4B.

[0024] The light combining element 5 receives the image light emitted from the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, combines the image light corresponding to the red light LR, the green light LG, and the blue light LB, and emits the combined image light toward the projection optical device 6. The light combining element 5 may be, for example, a cross dichroic prism.

[0025] The projection optical device 6 is composed of a plurality of projection lenses. The projection optical device 6 enlarges and projects the image light combined by the light combining element 5 onto the screen SCR. As a result, a color image is displayed on the screen SCR.

[0026] Next, the configuration of the first illumination device 20 will be described. FIG. 2 is a schematic configuration diagram of the first illumination device 20. As shown in FIG. As shown in FIG. 2, the first illumination device 20 includes a light source device 100, a collimating optical system 59, an integrator optical system 60, a polarization conversion element 63, and a superimposing optical system 64.

[0027] The light source device 100 includes a wavelength conversion member 50, a light source unit 70, an angle conversion member 52, a mirror 53, a support member 54, a holding member 65, and a pair of pressing members 91 and 92. The wavelength conversion member 50 of the present embodiment corresponds to the "light guiding member" in the claims.

[0028] The wavelength conversion member 50 has a rectangular prism shape extending along the X-axis and has six faces. The sides of the wavelength conversion member 50 extending along the X-axis are longer than the sides extending along the Y-axis and the Z-axis. Therefore, the X-axis corresponds to the longitudinal direction of the wavelength conversion member 50. The length of the side extending along the Y-axis is equal to the length of the side extending along the Z-axis. That is, the cross-sectional shape of the wavelength conversion member 50 cut along a plane along the YZ plane perpendicular to the X-axis is a square. Note that the cross-sectional shape of the wavelength conversion member 50 cut along a plane along the YZ plane may be rectangular.

[0029] The wavelength conversion member 50 has a first end face 50a and a second end face 50b, a first side face 50c and a second side face 50d, a third side face 50e and a fourth side face 50f. The first end face 50a and the second end face 50b intersect with the X-axis along the longitudinal direction of the wavelength conversion member 50 and are located on opposite sides of the X-axis. In this embodiment, the first end face 50a is located on the +X side, which is one side of the X-axis direction along the X-axis, and the second end face 50b is located on the -X side, which is the opposite direction of the X-axis direction.

[0030] The first side surface 50c and the second side surface 50d intersect with the first end surface 50a and the second end surface 50b, and intersect with the X-axis along the longitudinal direction of the wavelength conversion member 50, and are located on opposite sides to each other along the Y-axis which is perpendicular in this embodiment. In this embodiment, the first side surface 50c is located on one side of the Y-axis along the Y-axis, that is, the -Y side, and the second side surface 50d is located on the other side of the Y-axis along the Y-axis, that is, the +Y side.

[0031] The third side surface 50e and the fourth side surface 50f intersect with the first side surface 50c and the second side surface 50d, and intersect with the X-axis and the Y-axis, and are located on opposite sides of the Z-axis, which is perpendicular to the X-axis and the Y-axis in this embodiment. In this embodiment, the third side surface 50e is located in the +Z direction, which is one side of the Z-axis direction, and the fourth side surface 50f is located in the -Z direction, which is the other side of the Z-axis direction.

[0032] In the following description, when the first side surface 50c, the second side surface 50d, the third side surface 50e, and the fourth side surface 50f are not to be distinguished from each other, they may be simply referred to as the sides 50c, 50d, 50e, and 50f.

[0033] The wavelength conversion member 50 contains at least a phosphor, and converts the excitation light E having a first wavelength band emitted from the light source unit 70 into fluorescence Y having a second wavelength band different from the first wavelength band. The excitation light E enters the wavelength conversion member 50 from the first side surface 50c. The fluorescence Y is guided inside the wavelength conversion member 50 and then emitted from the first end face 50a. The excitation light E in this embodiment corresponds to the "first light" in the claims. The fluorescence Y in this embodiment corresponds to the "second light" in the claims.

[0034] The wavelength conversion member 50 contains a ceramic phosphor made of a polycrystalline phosphor that converts the wavelength of the excitation light E into the fluorescence Y. The second waveband of the fluorescence Y is, for example, a yellow waveband of 490 to 750 nm. That is, the fluorescence Y is yellow fluorescence containing a red light component and a green light component.

[0035] The wavelength conversion member 50 may contain a single crystal phosphor instead of a polycrystalline phosphor. Alternatively, the wavelength conversion member 50 may be made of fluorescent glass. Alternatively, the wavelength conversion member 50 may be made of a material in which a large number of phosphor particles are dispersed in a binder made of glass or resin. The wavelength conversion member 50 made of such a material converts the excitation light E into fluorescence Y.

[0036] Specifically, the material of the wavelength conversion member 50 includes, for example, an yttrium-aluminum-garnet (YAG) phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, the material of the wavelength conversion member 50 may be a material obtained by mixing raw material powders containing constituent elements such as Y2O3, Al2O3, and CeO3 and causing a solid-phase reaction, Y-Al-O amorphous particles obtained by a wet method such as a coprecipitation method or a sol-gel method, or YAG particles obtained by a gas phase method such as a spray drying method, a flame pyrolysis method, or a thermal plasma method.

[0037] The light source unit 70 faces the first side surface 50c of the wavelength conversion member 50, and emits excitation light E of a first wavelength band toward the first side surface 50c. The first wavelength band is, for example, a wavelength band from blue to violet of 400 nm to 480 nm, and has a peak wavelength of, for example, 445 nm. In this manner, the light source section 70 is provided to face the first side surface 50c, which is one of the four side surfaces 50c, 50d, 50e, and 50f of the wavelength conversion member 50 along the longitudinal direction.

[0038] The support member 54 extends in the X-axis direction along the longitudinal direction of the wavelength conversion member 50, has a groove 154 that accommodates a part of the wavelength conversion member 50, and the wavelength conversion member 50 is disposed inside the groove 154, and diffuses and releases heat generated by the wavelength conversion member 50 to the outside. For this reason, it is desirable that the support member 54 is made of a material that has a predetermined strength and high thermal conductivity. For example, metals such as aluminum and stainless steel are used as the material of the support member 54, and it is particularly desirable to use an aluminum alloy such as 6061 series. The specific configuration of the support member 54 will be described later.

[0039] The wavelength conversion member 50 of the present embodiment includes a first protrusion 151 that protrudes from the groove 154 in the +X direction, and a second protrusion 152 that protrudes from the groove 154 in the -X direction. The holding member 65 holds the first protruding portion 151 or the second protruding portion 152 protruding from the groove portion 154 of the support member 54. Therefore, the wavelength conversion member 50 is in a state where a part of it protrudes outside the groove portion 154 of the support member 54 without contacting the wall surface of the groove portion 154. The holding member 65 holds the part of the wavelength conversion member 50 protruding outside the groove portion 154. The holding member 65, together with the pair of pressing members 91, 92, regulates the position of the wavelength conversion member 50 with respect to the support member 54.

[0040] The pair of pressing members 91 and 92 regulate the position of the wavelength conversion member 50 in the Y-axis direction relative to the support member 54 inside the groove portion 154.

[0041] The pair of pressing members 91, 92 are disposed facing the support surface 54s of the groove portion 154. In this way, the pair of pressing members 91, 92 restrict the wavelength conversion member 50 from moving in the Y-axis direction within the groove portion 154. The pair of pressing members 91, 92 are made of an elastically deformable material. As an example, the pair of pressing members 91, 92 are made of leaf springs made of a metal material, for example, a stainless steel material such as SUS304.

[0042] The pair of pressing members 91, 92 are disposed at positions not overlapping with the light emitting elements 71 of the light source unit 70, and press the wavelength conversion member 50 against the support surface 54s of the groove portion 154 of the support member 54. The pair of pressing members 91, 92 are fixed to the support member 54.

[0043] The mirror 53 is provided on the second end surface 50b of the wavelength conversion member 50. The mirror 53 guides the light inside the wavelength conversion member 50 and reflects the fluorescence Y that reaches the second end surface 50b. The mirror 53 is made of a metal film or a dielectric multilayer film formed on the second end surface 50b of the wavelength conversion member 50.

[0044] In the first lighting device 20, when the excitation light E emitted from the light source unit 70 is incident on the wavelength conversion member 50, the phosphor contained in the wavelength conversion member 50 is excited, and the fluorescence Y is emitted from an arbitrary light-emitting point. The fluorescence Y travels in all directions from an arbitrary light-emitting point, but the fluorescence Y traveling toward the four side surfaces 50c, 50d, 50e, and 50f travels toward the first end surface 50a or the second end surface 50b while repeating total reflection at multiple points on the side surfaces 50c, 50d, 50e, and 50f. The first end surface 50a emits the fluorescence Y that has been guided inside the wavelength conversion member 50 by being propagated by total reflection. In the case of this embodiment, the fluorescence Y traveling toward the first end surface 50a is incident on the angle conversion member 52 provided on the first end surface 50a. The fluorescence Y traveling toward the second end surface 50b is reflected by the mirror 53 and travels toward the first end surface 50a.

[0045] Of the excitation light E incident on the wavelength conversion member 50, a portion of the excitation light E that is not used to excite the phosphor is reflected by the members surrounding the wavelength conversion member 50, including the light source unit 70, or by the mirror 53 provided on the second end face 50b. Therefore, a portion of the excitation light E is trapped inside the wavelength conversion member 50 and reused.

[0046] The angle conversion member 52 is provided on a first end surface 50a of the wavelength conversion member 50. The angle conversion member 52 is formed of, for example, a tapered rod. The angle conversion member 52 has a light incident surface 52a on which the fluorescence Y emitted from the wavelength conversion member 50 is incident, a light exit surface 52b from which the fluorescence Y exits, and a side surface 52c that reflects the incident fluorescence Y toward the light exit surface 52b.

[0047] The angle conversion member 52 has a quadrangular pyramid shape, and the cross-sectional area perpendicular to the optical axis J expands along the light traveling direction. Therefore, the area of ​​the light exit surface 52b is larger than the area of ​​the light incident surface 52a. The axis that passes through the centers of the light exit surface 52b and the light incident surface 52a and is parallel to the X-axis is defined as the optical axis J of the angle conversion member 52. The optical axis J of the angle conversion member 52 coincides with the optical axis AX1 of the first lighting device 20.

[0048] The fluorescence Y incident on the angle conversion member 52 changes direction each time it is totally reflected by the side surface 52c while traveling inside the angle conversion member 52 so as to approach a direction parallel to the optical axis J. In this way, the angle conversion member 52 converts the emission angle distribution of the fluorescence Y emitted from the first end face 50a of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum emission angle of the fluorescence Y on the light emission surface 52b smaller than the maximum incidence angle of the fluorescence Y on the light incidence surface 52a.

[0049] Generally, the etendue of light, which is defined as the product of the area of ​​the light exit region and the maximum exit angle, which is the solid angle of the light, is preserved, and therefore the etendue of the fluorescence Y is preserved both before and after transmission through the angle conversion member 52. As described above, the angle conversion member 52 has a configuration in which the area of ​​the light exit surface 52b is larger than the area of ​​the light incident surface 52a. For this reason, from the viewpoint of etendue preservation, the angle conversion member 52 can make the maximum exit angle of the fluorescence Y on the light exit surface 52b smaller than the maximum incident angle of the fluorescence Y on the light incident surface 52a.

[0050] The angle conversion member 52 is fixed to the wavelength conversion member 50 via an optical adhesive (not shown) so that the light incident surface 52a faces the first end surface 50a of the wavelength conversion member 50. That is, the angle conversion member 52 and the wavelength conversion member 50 are in contact with each other via an optical adhesive, and no gap such as an air layer is provided between the angle conversion member 52 and the wavelength conversion member 50. If a gap is provided between the angle conversion member 52 and the wavelength conversion member 50, the fluorescence Y that reaches the light incident surface 52a of the angle conversion member 52 and is incident on the light incident surface 52a at an angle equal to or greater than the critical angle is totally reflected by the light incident surface 52a and cannot be incident on the angle conversion member 52. In contrast, if no gap is provided between the angle conversion member 52 and the wavelength conversion member 50 as in this embodiment, the loss component of the fluorescence Y that cannot be incident on the angle conversion member 52 due to total reflection can be reduced. From this viewpoint, it is desirable to match the refractive index of the angle conversion member 52 and the refractive index of the wavelength conversion member 50 as much as possible.

[0051] A compound parabolic concentrator (CPC) may be used as the angle conversion member 52 instead of the tapered rod. Even when a CPC is used as the angle conversion member 52, the same effect as when a tapered rod is used can be obtained. Note that the light source device 100 does not necessarily have to include the angle conversion member 52.

[0052] The collimating optical system 59 is composed of a collimator lens and the like, and is provided between the light source device 100 and the integrator optical system 60. The collimating optical system 59 further narrows the angular distribution of the fluorescence Y emitted from the light source device 100, and causes the highly parallel fluorescence Y to be incident on the integrator optical system 60. Note that the collimating optical system 59 does not need to be provided when the parallelism of the fluorescence Y emitted from the angle conversion member 52 is sufficiently high.

[0053] The integrator optical system 60 has a first lens array 61 and a second lens array 62. The integrator optical system 60, together with the superimposing optical system 64, functions as a uniform illumination optical system that uniformizes the intensity distribution of the fluorescence Y emitted from the light source device 100 in each of the light modulation devices 4R and 4G, which are the illuminated areas. The fluorescence Y emitted from the collimating optical system 59 is incident on the first lens array 61. The first lens array 61, together with the second lens array 62 provided downstream of the light source device 100, constitutes the integrator optical system 60.

[0054] The first lens array 61 has a plurality of first small lenses 61a. The plurality of first small lenses 61a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20. The plurality of first small lenses 61a split the fluorescence Y emitted from the angle conversion member 52 into a plurality of partial light beams. The shape of each of the first small lenses 61a is a rectangle that is approximately similar to the shape of the image forming areas of the light modulation devices 4R and 4G. As a result, each of the partial light beams emitted from the first lens array 61 efficiently enters the image forming areas of the light modulation devices 4R and 4G.

[0055] The fluorescence Y emitted from the first lens array 61 travels toward the second lens array 62. The second lens array 62 is disposed opposite to the first lens array 61. The second lens array 62 has a plurality of second small lenses 62a corresponding to the plurality of first small lenses 61a of the first lens array 61. The second lens array 62, together with the superimposing optical system 64, forms each of the images of the plurality of first small lenses 61a of the first lens array 61 in the vicinity of the image forming areas of the light modulation devices 4R, 4G. The plurality of second small lenses 62a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20.

[0056] In this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 62a of the second lens array 62 have the same size, but may have different sizes. Also, in this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 62a of the second lens array 62 are arranged at positions where their optical axes coincide with each other, but may be arranged in an eccentric state with respect to each other.

[0057] The polarization conversion element 63 converts the polarization direction of the fluorescence Y emitted from the second lens array 62. Specifically, the polarization conversion element 63 converts each partial light beam of the fluorescence Y split by the first lens array 61 and emitted from the second lens array 62 into linearly polarized light.

[0058] The polarization conversion element 63 has a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the fluorescence Y emitted from the light source device 100 as is and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1, a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1, and a phase difference plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

[0059] The fluorescence Y transmitted through the polarization conversion element 63 is incident on the superimposing optical system 64. The superimposing optical system 64 cooperates with the integrator optical system 60 to form a uniform illumination optical system that homogenizes the intensity distribution of the fluorescence Y in each of the optical modulation devices 4R and 4G, which are the illuminated areas.

[0060] Fig. 3 is a perspective view showing a schematic configuration of the light source section 70. Fig. 4 is a cross-sectional view of the light source section 70 taken along line IV-IV in Fig. 3. As shown in FIGS. 3 and 4, the light source section 70 has a plurality of light emitting elements 71, a heat sink 80 formed of a plurality of heat dissipators 81, and a pad section 90. The light source unit 70 of this embodiment has five light emitting elements 71, and each of the multiple heat sinks 81 is provided corresponding to each light emitting element 71. In other words, the number of heat sinks 81 constituting the heat sink 80 is the same as the number of light emitting elements 71 in the light source unit 70. For this reason, the heat sink 80 of this embodiment is composed of five heat sinks 81. The heat sink 80 holds the multiple light emitting elements 71 in a state in which they are electrically connected in series. Note that the number of light emitting elements 71 in the light source unit 70 and the number of heat sinks 81 constituting the heat sink 80 may be the same, and are not limited to five.

[0061] Each light-emitting element 71 is composed of a light-emitting diode (LED). Hereinafter, the five light-emitting elements 71 arranged in the +X direction are referred to as the first light-emitting element 71A, the second light-emitting element 71B, the third light-emitting element 71C, the fourth light-emitting element 71D, and the fifth light-emitting element 71E, in that order. In other words, the multiple light-emitting elements 71 include the first light-emitting element 71A and the second light-emitting element 71B. Hereinafter, the configuration of each light-emitting element 71 will be described using the first light-emitting element 71A and the second light-emitting element 71B as examples.

[0062] The first light-emitting element 71A has a first surface 171 and a second surface 172 provided on the opposite side of the first surface 171. The first surface 171 includes a first light-emitting region 171a that emits excitation light E, and a pair of first anode electrodes 171b arranged on either side of the first light-emitting region 171a. The second surface 172 includes a first cathode electrode 172b.

[0063] The first light-emitting element 71A of the present embodiment has a pair of first anode electrodes 171b sandwiching the first light-emitting region 171a on the first surface 171, and therefore the current density supplied to the first light-emitting region 171a is stabilized, so that the first light-emitting region 171a can emit light uniformly. Therefore, the first light-emitting element 71A can emit excitation light with uniform brightness from the first light-emitting region 171a.

[0064] The second light-emitting element 71B has a similar configuration to the first light-emitting element 71A. Specifically, the second light-emitting element 71B has a third surface 173 and a fourth surface 174 provided on the opposite side of the third surface 173. The third surface 173 includes a second light-emitting region 173a that emits excitation light E, and a pair of second anode electrodes 173b arranged on either side of the second light-emitting region 173a. The fourth surface 174 includes a second cathode electrode 174b.

[0065] The second light-emitting element 71B of this embodiment has a pair of second anode electrodes 173b on the third surface 173 that sandwich the second light-emitting region 173a, so that the current density supplied to the second light-emitting region 173a is stabilized, allowing excitation light to be emitted from the second light-emitting region 173a with uniform brightness.

[0066] Moreover, the five heat sinks 80 and the five heat sinks 81 arranged in the +X direction are referred to as the first heat sink 81A, the second heat sink 81B, the third heat sink 81C, the fourth heat sink 81D, and the fifth heat sink 81E, respectively. That is, the multiple heat sinks 81 include the first heat sink 81A and the second heat sink 81B. Below, the configuration of each heat sink 81 and the electrical connection between two light-emitting elements 71 mounted on adjacent heat sinks 81 will be described using the first heat sink 81A and the second heat sink 81B as examples.

[0067] 4, the first heat dissipating body 81A has a first support 181, a first heat dissipating fin 182, and a first conductive layer 186. The first support 181 and the first heat dissipating fin 182 have an integral structure made of the same material. Therefore, the first heat dissipating body 81A has a substantially L-shaped cross section. The first heat dissipating body 81A is made of a metal material having excellent thermal conductivity, such as stainless steel, aluminum, or copper.

[0068] The first support portion 181 supports the second surface 172 of the first light emitting element 71A and is electrically connected to the first light emitting element 71A. The first support portion 181 is electrically connected to the first cathode electrode 172b on the second surface 172 of the first light emitting element 71A. Note that, for example, a solder layer is provided between the first cathode electrode 172b and the first support portion 181.

[0069] The first support portion 181 has a support surface 181a that supports the second surface 172 of the first light-emitting element 71A, a back surface 181b facing away from the support surface 181a, one side surface 181c that is perpendicular to the support surface 181a and the back surface 181b and connects the -X direction ends of the support surface 181a and the back surface 181b, and the other side surface 181d that is perpendicular to the support surface 181a and the back surface 181b and connects the +X direction ends of the support surface 181a and the back surface 181b.

[0070] The first heat dissipation fin 182 extends from a rear surface 181b of the first support portion 181 opposite to the first light emitting element 71A, and is a plate-like portion parallel to the YZ plane. In the present embodiment, the first heat dissipating body 81A includes only one first heat dissipating fin 182, but a plurality of first heat dissipating fins 182 may be arranged side by side in the X-axis direction.

[0071] In the arrangement direction (X-axis direction) in which first heat dissipation body 81A and second heat dissipation body 81B are aligned, first support portion 181 has a thicker shape than first heat dissipation fin 182. In other words, the width in the X-axis direction of first support portion 181 is greater than the width in the X-axis direction of first heat dissipation fin 182. With this configuration, by making first heat dissipation fin 182 thinner than first support portion 181, the heat dissipation property of first heat dissipation fin 182 can be further improved.

[0072] The first conductive layer 186 is provided via a first insulating layer 186a in a region of the first support portion 181 different from the support region for the first light emitting element 71A. The first insulating layer 186a is made of, for example, an adhesive having insulating properties.

[0073] 3 and 4, the first conductive layer 186 is provided on the first support portion 181 so as to cover a portion of the support surface 181a that does not overlap with the second surface 172 of the first light-emitting element 71A and one side surface 181c. Since the first insulating layer 186a is provided between the first conductive layer 186 and the first support portion 181, the first conductive layer 186 and the first support portion 181 are not electrically connected to each other.

[0074] The first conductive layer 186 is electrically connected to the first surface 171 of the first light-emitting element 71A. Specifically, as shown in Fig. 3, the first conductive layer 186 is connected to a pair of first anode electrodes 171b provided on the first surface 171 of the first light-emitting element 71A via metal wires 35. The metal wires 35 are provided by, for example, a wire bonding device. The first conductive layer 186 is insulated from the first support 181, which is electrically connected to the first cathode electrode 172b of the second surface 172 of the first light emitting element 71A, by the above-mentioned first insulating layer 186a. Therefore, there is no short circuit between the first anode electrode 171b and the first cathode electrode 172b of the first light emitting element 71A.

[0075] The second heat dissipation body 81B has a second support portion 183, a second heat dissipation fin 184, and a second conductive layer 187. The second support portion 183 and the second heat dissipation fin 184 have an integral structure made of the same material. Therefore, the second heat dissipation body 81B has a substantially L-shaped cross section. The second heat dissipation body 81B is made of a metal material having excellent thermal conductivity, such as stainless steel, aluminum, or copper.

[0076] The second support portion 183 supports the fourth surface 174 of the second light emitting element 71B and is electrically connected to the second light emitting element 71B. The second support portion 183 is electrically connected to the second cathode electrode 174b on the fourth surface 174 of the second light emitting element 71B. Note that, for example, a solder layer is provided between the second anode electrode 173b and the second support portion 183.

[0077] The second support portion 183 has a support surface 183a that supports the fourth surface 174 of the second light-emitting element 71B, a back surface 183b facing away from the support surface 183a, one side surface 183c that is perpendicular to the support surface 183a and the back surface 183b and connects the -X direction ends of the support surface 183a and the back surface 183b, and the other side surface 183d that is perpendicular to the support surface 183a and the back surface 183b and connects the +X direction ends of the support surface 183a and the back surface 183b.

[0078] The second heat dissipation fin 184 extends from a rear surface 183b of the second support portion 183 opposite to the second light emitting element 71B, and is a plate-like portion parallel to the YZ plane. In the present embodiment, the second heat dissipating body 81B includes only one second heat dissipating fin 184, but a plurality of second heat dissipating fins 184 may be arranged side by side in the X-axis direction.

[0079] Second support portion 183 has a thicker shape than second heat dissipation fin 184. That is, the width in the X-axis direction of second support portion 183 is greater than the width in the X-axis direction of second heat dissipation fin 184. According to this configuration, by making the thickness of second heat dissipation fin 184 thinner than second support portion 183, the heat dissipation property of second heat dissipation fin 184 can be further improved.

[0080] In this embodiment, the first heat dissipating fin 182 and the second heat dissipating fin 184 are spaced apart from each other. In other words, the first heat dissipating fin 182 and the second heat dissipating fin 184 are not in contact with each other. In the X-axis direction, the first heat dissipation fin 182 is disposed on one side (+X side) of the first support portion 181, and the second heat dissipation fin 184 is disposed on one side (+X side) of the second support portion 183. With this configuration, a large gap can be secured between the first heat dissipation fin 182 and the second heat dissipation fin 184 that are adjacent in the X-axis direction, so that heat transfer between the first heat dissipation fin 182 and the second heat dissipation fin 184 is suppressed, and heat can be efficiently dissipated from each of the first heat dissipation fin 182 and the second heat dissipation fin 184.

[0081] The second conductive layer 187 is provided via a second insulating layer 187a in a region of the second support portion 183 different from the support region for the second light emitting element 71B. The second insulating layer 187a is made of, for example, an adhesive having insulating properties.

[0082] Specifically, the second conductive layer 187 is provided on the second support portion 183 so as to cover a portion of the support surface 183a that does not overlap with the fourth surface 174 of the second light emitting element 71B and one side surface 183c. Since the second insulating layer 187a is provided between the second conductive layer 187 and the second support portion 183, the second conductive layer 187 and the second support portion 183 are not electrically connected to each other.

[0083] The second conductive layer 187 is electrically connected to the third surface 173 of the second light emitting element 71B. Specifically, as shown in FIG. 3, the second conductive layer 187 is connected to a pair of second anode electrodes 173b provided on the third surface 173 of the second light emitting element 71B via metal wires 35. The second conductive layer 187 is insulated from the second support portion 183, which is electrically connected to the second cathode electrode 174b on the fourth surface 174 of the second light emitting element 71B, by the above-mentioned second insulating layer 187a. For this reason, there is no short circuit between the second anode electrode 173b and the second cathode electrode 174b of the second light emitting element 71B.

[0084] As shown in FIG. 4, the second conductive layer 187 of the second support 183 abuts against the other side surface 181d of the first support 181. The second conductive layer 187 and the first support 181 are fixed via a conductive adhesive layer 188. For example, a conductive adhesive, a solder material, a brazing material, or the like can be used as the conductive adhesive layer 188. As a result, the first cathode electrode 172b of the second surface 172 of the first light-emitting element 71A, which is in electrical conduction with the first support 181, is electrically connected (conductive state) to a pair of second anode electrodes 173b of the third surface 173 of the second light-emitting element 71B, which is in electrical conduction with the second conductive layer 187. That is, the second conductive layer 187 of the second support 183 is in electrical conduction with the first support 181, so that the anode electrode of the second light-emitting element 71B and the cathode electrode of the first light-emitting element 71A are electrically connected.

[0085] In this manner, the first light emitting element 71A and the second light emitting element 71B are electrically connected via the first support portion 181 of the first heat sink 81A and the second support portion 183 of the second heat sink 81B. In the present embodiment, the first light emitting element 71A and the second light emitting element 71B are electrically connected in series.

[0086] Moreover, the second light emitting element 71B and the third light emitting element 71C are electrically connected in series since they are conductive to each other via the second heat radiator 81B and the third heat radiator 81C. Moreover, the third light emitting element 71C and the fourth light emitting element 71D are electrically connected in series since they are conductive to each other via the third heat sink 81C and the fourth heat sink 81D. Moreover, the fourth light emitting element 71D and the fifth light emitting element 71E are electrically connected in series since they are conductive to each other via the fourth heat radiator 81D and the fifth heat radiator 81E.

[0087] As described above, the light source section 70 of this embodiment has a structure in which a plurality of light emitting elements 71 are connected in series via the pad section 90 so that a current flows in the +X direction. The pad section 90 supplies power to the multiple light-emitting elements 71. The pad section 90 has a first power supply pad 90a and a second power supply pad 90b. The first power supply pad 90a is connected, for example, to a positive electrode extending from a power supply device (not shown), and the second power supply pad 90b is connected to a negative electrode extending from the power supply device (not shown).

[0088] The first power supply pad 90a and the second power supply pad 90b are provided on both ends of the multiple heat sinks 81. Specifically, the first power supply pad 90a is provided on one side surface 181c of the first support 181 via the first conductive layer 186. The second power supply pad 90b is provided on a side surface 185d of the support 185 of the fifth heat sink 81E opposite to the fourth heat sink 81D.

[0089] In the present embodiment, the first power supply pad 90a and the second power supply pad 90b are provided on a support portion that is a thick portion of the heat sink 81, so that the first power supply pad 90a and the second power supply pad 90b can be held in a stable state. This can improve the reliability of conduction between the first power supply pad 90a and the second power supply pad 90b and each electrode of the power supply device even if the first power supply pad 90a and the second power supply pad 90b are misaligned or deformed.

[0090] In the light source device 100 of this embodiment, each light emitting element 71 of the light source section 70 generates heat when emitting the excitation light E. If the temperature of the light emitting element 71 made of an LED becomes high, the emission wavelength becomes long, and there is a risk of the amount of light of the desired wavelength decreasing. Also, the lower the operating temperature of the LED, the higher the light emitting efficiency and the longer the life can be achieved.

[0091] In the light source unit 70 of the present embodiment, each light-emitting element 71 is provided on a heat sink 81, and therefore heat from each light-emitting element 71 is dissipated via the corresponding heat sink 81. Thus, the light source unit 70 can efficiently cool the multiple light-emitting elements 71.

[0092] Furthermore, since each light-emitting element 71 is provided on the heat sink 81 of the same shape, the heat dissipation performance of each light-emitting element 71 is approximately uniform. Therefore, the light source unit 70 can prevent variation in cooling performance from occurring between each light-emitting element 71. Therefore, the light source unit 70 can irradiate the wavelength conversion member 50 with bright excitation light E with reduced illuminance unevenness.

[0093] Fig. 5 is a plan view of the light source device 100 as viewed from the Y-axis direction. Fig. 6 is a cross-sectional view of the light source device 100 taken along line VI-VI in Fig. 5. As shown in FIG. 5, the support member 54 further has a spring fixing portion 540, a first accommodating portion 541, a second accommodating portion 542, a third accommodating portion 543, a fourth accommodating portion 544, a fifth accommodating portion 545, and a sixth accommodating portion 546.

[0094] The spring fixing portions 540 are disposed on both sides of the groove portion 154 in the Z-axis direction along the short side of the wavelength conversion member 50. The spring fixing portions 540 fix both ends of the pressing members 91, 92, which are disposed straddling the wavelength conversion member 50 in the Z-axis direction, with screws 96, respectively.

[0095] 6, the groove 154 of the support member 54 has a U-shaped cross section perpendicular to the X-axis direction. The groove 154 has a support surface 54s, a first wall surface 54a, and a second wall surface 54b.

[0096] The support surface 54s corresponds to the bottom surface of the groove portion 154. In the case of this embodiment, the support surface 54s is a surface extending parallel to the XZ plane, and supports the second side surface 50d of the wavelength conversion member 50. The first wall surface 54a corresponds to one side surface of the groove portion 154, faces the third side surface 50e of the wavelength conversion member 50, and is spaced from the third side surface 50e. That is, a gap is provided between the first wall surface 54a and the third side surface 50e of the wavelength conversion member 50. The second wall surface 54b corresponds to the other side surface of the groove portion 154, faces the fourth side surface 50f of the wavelength conversion member 50, and is spaced from the fourth side surface 50f. That is, a gap is provided between the second wall surface 54b and the fourth side surface 50f of the wavelength conversion member 50.

[0097] The first wall surface 54a has a first portion 54a1 located on the first side surface 50c side and a second portion 54a2 located on the support surface 54s side. The first portion 54a1 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The second portion 54a2 inclines so as to approach the third side surface 50e from the first portion 54a1 side toward the support surface 54s side. In other words, the distance between the second portion 54a2 and the third side surface 50e on the support surface 54s side is smaller than the distance between the second portion 54a2 and the third side surface 50e on the first portion 54a1 side.

[0098] The second wall surface 54b has a third portion 54b3 located on the first side surface 50c side and a fourth portion 54b4 located on the support surface 54s side. The third portion 54b3 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The fourth portion 54b4 is inclined so as to approach the fourth side surface 50f from the third portion 54b3 side toward the support surface 54s side. In other words, the distance between the fourth portion 54b4 and the fourth side surface 50f on the support surface 54s side is smaller than the distance between the fourth portion 54b4 and the fourth side surface 50f on the third portion 54b3 side.

[0099] Each of the first wall surface 54a and the second wall surface 54b is made of a surface of a metal such as aluminum or stainless steel, which is a material of the support member 54. More specifically, each of the first wall surface 54a and the second wall surface 54b is made of a processed surface that is a mirror-finished surface of the above-mentioned metal surface. Therefore, each of the first wall surface 54a and the second wall surface 54b has light reflectivity and reflects the incident excitation light E. Note that each of the first wall surface 54a and the second wall surface 54b may be made of another metal film or a dielectric multilayer film formed on a surface of a metal such as aluminum or stainless steel.

[0100] Since the first wall surface 54a and the second wall surface 54b of the groove portion 154 need to be mirror-finished as described above, the portion where the groove portion 154 is provided requires higher machining accuracy than other portions of the support member 54. For this reason, the portion of the support member 54 where the groove portion 154 is provided may be made of a separate member, and may be combined with a separate member forming the portion other than the groove portion 154 to form one support member 54. In other words, the support member 54 may be made of a combination of multiple members. In this way, since the peripheral portion of the groove portion 154 is formed of a separate member, the workability and machining accuracy of the first wall surface 54a and the second wall surface 54b of the groove portion 154 can be improved.

[0101] Here, the region that emits the excitation light E in each light-emitting element 71 is referred to as the light-emitting region 71a. In this case, the dimension W1 along the Z-axis direction of the light-emitting region 71a of each light-emitting element 71 is larger than the width B2 along the Z-axis direction of the wavelength conversion member 50. Note that the width in the Z-axis direction of the wavelength conversion member 50 in this embodiment is uniform throughout the longitudinal direction. As a result, in the Z-axis direction, both ends of the light-emitting region 71a of the light-emitting element 71 protrude outside the first side surface 50c of the wavelength conversion member 50. Specifically, both ends of the light-emitting region 71a of the light-emitting element 71 protrude to positions overlapping the gap between the third side surface 50e and the first wall surface 54a and the gap between the fourth side surface 50f and the second wall surface 54b. In other words, when the light-emitting region 71a is viewed along the Y-axis direction from the support surface 54s, a part of the light-emitting region 71a overlaps with the first side surface 50c, and another part of the light-emitting region 71a overlaps with the gap between the third side surface 50e and the first wall surface 54a and the gap between the fourth side surface 50f and the second wall surface 54b.

[0102] The first width D2 of the support surface 54s of the support member 54 along the Z-axis direction is larger than the width B2 of the wavelength conversion member 50 along the Z-axis direction. As a result, both ends of the support surface 54s in the Z-axis direction protrude outside the second side surface 50d of the wavelength conversion member 50. In other words, when the support surface 54s is viewed from the light-emitting region 71a along the Y-axis direction, a part of the support surface 54s overlaps with the second side surface 50d, and another part of the support surface 54s is exposed outside the second side surface 50d. In this way, the support surface 54s has an exposed portion exposed to the outside of the wavelength conversion member 50.

[0103] According to the light source device 100 of the present embodiment, a part of the excitation light E2 emitted from the light emitting region 71a of each light emitting element 71 passes through the gap between the third side surface 50e and the first portion 54a1 of the wavelength conversion member 50, and then enters the second portion 54a2 inclined with respect to the support surface 54s. At this time, the excitation light E2 is reflected by the second portion 54a2 and enters the third side surface 50e of the wavelength conversion member 50. In this way, the excitation light E2 passing through the gap between the third side surface 50e and the first wall surface 54a of the wavelength conversion member 50 is easily entered into the third side surface 50e, so that the amount of the excitation light E reflected by the support surface 54s and returning to the side of the light source unit 70 can be reduced. In addition, a part of the excitation light E is reflected by the first portion 54a1 extending perpendicularly to the support surface 54s and enters the third side surface 50e of the wavelength conversion member 50. This makes it possible to realize a light source device 100 in which the utilization efficiency of the excitation light E is high and fluorescence Y having a desired intensity can be easily obtained.

[0104] Returning to FIG. 5, the first accommodating portion 541 is a recess communicating with the groove portion 154 in the +X direction. The first accommodating portion 541 penetrates to the outer edge 54d of the support member 54. The first accommodating portion 541 accommodates the first protruding portion 151 of the wavelength conversion member 50 protruding from the groove portion 154. The first accommodating portion 541 also holds the angle conversion member 52 fixed to the first end surface 50a of the wavelength conversion member 50. In this embodiment, the angle conversion member 52 fixed to the first end surface 50a of the first protruding portion 151 is held by the support member 54. The light exit surface 52b of the angle conversion member 52 housed in the first housing portion 541 is flush with the outer edge 54d of the support member 54 in a plan view.

[0105] The second accommodating portion 542 is a recess communicating with the groove portion 154 in the -X direction. The second accommodating portion 542 penetrates to the outer edge 54d of the support member 54. The second accommodating portion 542 accommodates the second protruding portion 152 of the wavelength conversion member 50 protruding from the groove portion 154. The second accommodating portion 542 is provided in a state not communicating with the outer edge 54d of the support member 54. The second accommodating portion 542 accommodates the second protruding portion 152 of the wavelength conversion member 50 protruding from the groove portion 154. In this embodiment, the mirror 53 is provided on the second end surface 50b of the second protruding portion 152. The second accommodating portion 542 accommodates the mirror 53 provided on the second end surface 50b of the wavelength conversion member 50.

[0106] The third accommodating portion 543 is a recess that communicates with the first accommodating portion 541 in the +Z direction. The third accommodating portion 543 accommodates a holding member 65 that holds the +Z side of the first protruding portion 151 of the wavelength conversion member 50 accommodated in the first accommodating portion 541.

[0107] The fourth accommodating portion 544 is a recess that communicates with the first accommodating portion 541 in the -Z direction. The fourth accommodating portion 544 accommodates a holding member 65 that holds the -Z side of the first protruding portion 151 of the wavelength conversion member 50 accommodated in the first accommodating portion 541.

[0108] The fifth accommodating portion 545 is a recess that communicates with the second accommodating portion 542 in the +Z direction. The fifth accommodating portion 545 accommodates a holding member 65 that holds the +Z side of the second protrusion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0109] The sixth accommodating portion 546 is a recess that communicates with the third accommodating portion 543 in the -Z direction. The sixth accommodating portion 546 accommodates a holding member 65 that holds the -Z side of the second protrusion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0110] The pair of holding members 65 sandwiching the first protruding portion 151 and the second protruding portion 152 of the wavelength conversion member 50 from both sides are capable of adjusting their positions in the Z axis direction.

[0111] In this manner, the wavelength conversion member 50 of this embodiment is held within the groove portion 154 with the movement in the Z-axis direction of the first protrusion 151 and the second protrusion 152 protruding outside the groove portion 154 being restricted by the holding member 65.

[0112] As described above, the light source device 100 of the present embodiment includes a plurality of light emitting elements 71 including a first light emitting element 71A and a second light emitting element 71B, and a heat sink 80 including a plurality of heat sinks 81 including a first heat sink 81A and a second heat sink 81B. The heat sink 80 holds the plurality of light emitting elements 71 in a state in which they are electrically connected in series, and the first light emitting element 71A has a first surface 171 including a first light emitting region 171a, and a second surface 172 provided on the opposite side of the first surface 171 and including a first cathode electrode 172b. The second light emitting element 71B has a third surface 173 including a second light emitting region 173a, and a fourth surface 174 provided on the opposite side of the third surface 173 and including a second cathode electrode 174b. The first heat sink 81A has a first support 181 that supports the second surface 172 of the first light emitting element 71A and is electrically connected to the first light emitting element 71A, and a first heat sink fin 182 that extends from the first support 181 to the opposite side of the first light emitting element 71A. The second heat sink 81B has a second support 183 that supports the fourth surface 174 of the second light emitting element 71B and is electrically connected to the second light emitting element 71B, and a second heat sink fin 184 that extends from the second support 183 to the opposite side of the second light emitting element 71B. The first light emitting element 71A and the second light emitting element 71B are electrically connected via the first support 181 of the first heat sink 81A and the second support 183 of the second heat sink 81B.

[0113] According to the light source device 100 of this embodiment, in the case of adopting a structure in which a plurality of light emitting elements 71 are electrically connected in series, the heat of the first light emitting element 71A and the second light emitting element 71B can be dissipated by the first heat dissipation body 81A and the second heat dissipation body 81B constituting the heat sink 80. Therefore, according to the light source device 100 of this embodiment, the plurality of light emitting elements 71 can be efficiently cooled. As a result, the excitation light E is efficiently incident on the wavelength conversion member 50, and therefore bright fluorescence Y can be generated.

[0114] The projector 1 of the present embodiment is provided with the light source device 100 that efficiently extracts bright fluorescent light Y from the wavelength conversion member 50, and therefore has excellent light utilization efficiency.

[0115] (First Modification) The light source device of the first modification will be described below. The difference between the light source device of this modification and the light source device 100 of the above embodiment is the configuration of the light source unit. Therefore, the configuration of the light source unit will be mainly described below.

[0116] 7 is a cross-sectional view of the light source device of the first modified example. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals, and description thereof will be omitted. 7, the light source section 270 of this modification has a plurality of light emitting elements 271, a heat sink 80 formed of a plurality of heat dissipators 81, and a pad section 90. The light source section 270 of this modification has four light emitting elements 271.

[0117] Hereinafter, the four light-emitting elements 271 aligned in the +X direction will be referred to as a first light-emitting element 271A, a second light-emitting element 271B, a third light-emitting element 271C, and a fourth light-emitting element 271D, in that order. Below, the configuration of each light-emitting element 271 will be described using the first light-emitting element 271A and the second light-emitting element 271B as examples.

[0118] The first light-emitting element 271A has a first surface 371 and a second surface 372 provided on the opposite side of the first surface 371. The first surface 371 includes a first light-emitting region 371a that emits excitation light E. The second surface 372 includes a first anode electrode 372a and a first cathode electrode 372b. That is, the first light-emitting element 271A of this modification has the first anode electrode 372a and the first cathode electrode 372b provided on the second surface 372.

[0119] The second light-emitting element 271B has a similar configuration to the first light-emitting element 271A. The second light-emitting element 271B of this modification has a third surface 373 including a second light-emitting region 373a that emits excitation light E, and a fourth surface 374 including a second anode electrode 374a and a second cathode electrode 374b.

[0120] The first support portion 181 of the first heat dissipation body 81A and the second support portion 183 of the second heat dissipation body 81B are fixed together via an insulating member 189. Specifically, the other side surface 181d of the first support portion 181 and one side surface 182c of the second support portion 183 are fixed together via the insulating member 189. As the insulating member 189, for example, an adhesive having insulating properties is used. According to this configuration, the first heat dissipating body 81A and the second heat dissipating body 81B are integrally held in an insulated state, so that the device configuration can be made compact.

[0121] In this modified example, a part of the first light emitting element 271A is disposed on the first support portion 181, and the remaining part of the first support portion 181 is disposed on the second support portion 183. Specifically, the first light emitting element 271A is disposed so as to straddle between the first support portion 181 and the second support portion 183. The first anode electrode 372a of the first light emitting element 271A is electrically connected to the support surface 181a of the first support portion 181, and the first cathode electrode 372b of the first light emitting element 271A is electrically connected to the support surface 183a of the second support portion 183. For example, a solder layer 190 is provided between the first anode electrode 372a and the support surface 181a and between the first cathode electrode 372b and the support surface 183a.

[0122] The second light emitting element 271B, like the first light emitting element 271A, is disposed so as to straddle between the second support portion 183 of the second heat sink 81B and the support portion of the third heat sink 81C. The second anode electrode 374a of the second light emitting element 271B is electrically connected to the support surface 183a of the second support portion 183, and is electrically connected to the first cathode electrode 372b of the first light emitting element 271A via the second support portion 183, thereby establishing a conductive state.

[0123] In this manner, the first light emitting element 271A and the second light emitting element 271B are electrically connected in series via the first support portion 181 of the first heat dissipation body 81A and the second support portion 183 of the second heat dissipation body 81B.

[0124] In this modified example, the four light emitting elements 271 are arranged so as to straddle two adjacent heat sinks 81, so that the plurality of light emitting elements 271 are electrically connected in series. In the configuration of this modified example, the number of light emitting elements 271 is one less than the number of heat sinks 81.

[0125] In this modification, the first power supply pad 90a is provided on one side surface 181c of the first support portion 181, and the second power supply pad 90b is provided on a side surface 185d of the support portion 185 of the fifth heat sink 81E opposite to the fourth heat sink 81D. Also in this modification, the heat dissipation fins of adjacent heat sinks 81 are not in contact with each other, so that each heat dissipation fin can efficiently dissipate its own heat.

[0126] According to the light source section 270 of this modification, each light emitting element 271 is disposed so as to straddle two heat sinks 81, so that heat from each light emitting element 271 is efficiently released via the heat sink 81.

[0127] (Second Modification) The light source device of the second modified example will be described below. The difference between the light source device of this modified example and the light source device 100 of the above embodiment is the configuration of the light source unit. Therefore, the configuration of the light source unit will be mainly described below.

[0128] 8 is a cross-sectional view of the light source device of Modification 2. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals, and description thereof will be omitted. As shown in FIG. 8, a light source section 370 of this modification includes a plurality of light emitting elements 271, a heat sink 380 formed of a plurality of heat dissipators 381, and a pad section 90. The light source section 370 of this modification has five light emitting elements 271, and a plurality of heat sinks 381 are provided corresponding to each of the light emitting elements 271.

[0129] The five heat sinks 380 and the five heat sinks 381 arranged in the +X direction are referred to as a first heat sink 381A, a second heat sink 381B, a third heat sink 381C, a fourth heat sink 381D, and a fifth heat sink 381E. Below, the configuration of each heat sink 381 and the electrical connection between two light emitting elements 271 mounted on adjacent heat sinks 381 will be described using the first heat sink 381A as an example.

[0130] The first heat sink 381A has a first support portion 481 supporting the first light emitting element 271A, and a first heat dissipation fin 482. The first support portion 481 includes a first portion 481a, a second portion 481b, and an insulating layer 481c. The first portion 481a of the first support portion 481 is made of a material having electrical conductivity and is electrically connected to the first anode electrode 372a of the first light emitting element 271A. The second portion 481b of the first support portion 481 is made of a material having electrical conductivity and is electrically connected to the first cathode electrode 372b of the first light emitting element 271A. The heat dissipation fin 482 is provided integrally with the second portion 481b. In the case of this modification, the width in the X-axis direction of the second portion 481b of the first support portion 481 is equal to the width in the X-axis direction of the heat dissipation fin 482, and the heat dissipation fin 482 and the second portion 481b form a plate shape as a whole.

[0131] The first portion 481a and the second portion 481b are insulated from each other via an insulating layer 481c. For example, a solder layer 190 is provided between the first anode electrode 372a and the first portion 481a and between the first cathode electrode 372b and the second portion 481b.

[0132] The multiple heat sinks 381 are arranged to electrically connect a first portion of one of the adjacent heat sinks 381 to a second portion of the other of the adjacent heat sinks 381. For example, the second portion of the first heat sink 381A and the first portion of the second heat sink 381B are electrically connected in series to the first cathode electrode 372b of the first light emitting element 271A and the second anode electrode 374a of the second light emitting element 271B. In this modified example, the first power supply pad 90a is provided on the -X direction surface of the first part 481a of the first heat sink 381A, and the second power supply pad 90b is provided on the +X direction surface of the second part of the fifth heat sink 381E that supports the fifth light-emitting element 271E. Based on this configuration, the light source section 370 of this modified example allows the multiple light emitting elements 271 to be electrically connected in series.

[0133] According to the light source unit 370 of this modification, heat from each light emitting element 271 is efficiently released via the heat sink 381, so that it is possible to efficiently cool the plurality of light emitting elements 271. Therefore, the light source unit 370 can irradiate bright excitation light E with reduced unevenness in illuminance.

[0134] 8 shows an example in which the width in the X-axis direction of the second portion 481b of the first support portion 481 is equal to the width in the X-axis direction of the heat dissipation fin 482, but as shown in Fig. 9, the width of the second portion 481b may be greater than the width of the heat dissipation fin 482. In this case, each heat sink 381 has a substantially T-shaped cross section as shown in Fig. 9. With this configuration, the width of the second portion 481b may be increased to prevent the light emitting elements 271 from getting too close to each other, thereby further improving the heat dissipation performance of each light emitting element 271.

[0135] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the light source unit 70 of the first embodiment, the case where adjacent heat sinks 81 are joined to each other by the conductive adhesive layer 188 has been described as an example, but the method of joining the heat sinks 81 to each other is not limited to this. For example, through holes penetrating each support part of the heat sink 81 may be formed, and the multiple heat sinks 81 may be fixed to each other by resin bolts inserted into each through hole.

[0136] In the light source device 100 of the above embodiment, the wavelength conversion member 50 has the first protrusion 151 and the second protrusion 152 in the X-axis direction, but only the first protrusion 151 may be provided. In this case, the holding member 65 is disposed only on the first protrusion 151 side.

[0137] In the above embodiment, each wall surface of the groove 154 of the support member 54 has a portion perpendicular to the support surface 54s and a portion inclined relative to the support surface 54s, but the shape of the groove 154 is not particularly limited, and for example, the entire area of ​​the wall surface of the groove may be perpendicular to the support surface. Also, the wall surface of the groove may be curved.

[0138] In the above embodiment, the present invention is applied to a light source device equipped with a wavelength conversion member, but instead of this configuration, the present invention may be applied to a light source device that propagates incident light without wavelength conversion, and then controls the angular distribution and emits the light. In this case, the wavelength conversion member in the above embodiment replaces the light guide member, and the light emitted from the light emitting element is emitted from the angle conversion member as light of the same wavelength band.

[0139] In addition, the specific description of the shape, number, arrangement, material, etc. of each component of the light source device and the projector is not limited to the above embodiment and can be changed as appropriate. In addition, in the above embodiment, an example in which the light source device according to the present invention is mounted on a projector using a liquid crystal panel is shown, but this is not limited to this. The light source device according to the present invention may be applied to a projector using a digital micromirror device as a light modulation device. In addition, the projector does not need to have multiple light modulation devices, and may have only one light modulation device.

[0140] In the above embodiment, the light source device of the present invention is applied to a projector, but the present invention is not limited to this. The light source device of the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

[0141] The following is a summary of this disclosure. (Appendix 1) A plurality of light emitting elements including a first light emitting element and a second light emitting element; a heat sink including a plurality of heat sinks including a first heat sink and a second heat sink; the heat sink holds the plurality of light emitting elements in a state in which the light emitting elements are electrically connected in series; the first light emitting element has a first surface including a first light emitting region and a second surface provided on the opposite side of the first surface and including at least one electrode; the second light emitting element has a third surface including a second light emitting region, and a fourth surface provided on the opposite side of the third surface and including at least one electrode; the first heat sink includes a first support portion that supports the second surface of the first light emitting element and is electrically connected to the first light emitting element, and a first heat dissipation fin that extends on a side of the first support portion opposite to the first light emitting element, the second heat sink includes a second support portion that supports the fourth surface of the second light emitting element and is electrically connected to the second light emitting element, and a second heat dissipation fin that extends on a side of the second support portion opposite to the second light emitting element, the first light emitting element and the second light emitting element are electrically connected via the first support portion of the first heat sink and the second support portion of the second heat sink; Light source device.

[0142] According to the light source device having this configuration, when a structure is adopted in which a plurality of light emitting elements are electrically connected in series, the heat of the first light emitting element and the second light emitting element can be dissipated by the first heat dissipation body and the second heat dissipation body constituting the heat sink, respectively. Therefore, according to the light source device having this configuration, the plurality of light emitting elements can be efficiently cooled.

[0143] (Appendix 2) the first heat sink is provided in a region of the first support portion different from a support region of the first light emitting element via a first insulating layer, and further includes a first conductive layer electrically connected to the first surface of the first light emitting element; the second heat sink is provided in a region of the second support portion different from a support region of the second light emitting element via a second insulating layer, and further includes a second conductive layer electrically connected to the third surface of the second light emitting element; the second conductive layer of the second support portion abuts against the first support portion, thereby electrically connecting the third surface of the second light-emitting element and the second surface of the first light-emitting element. 2. A light source device as described in claim 1.

[0144] According to this configuration, the second surface of the first light emitting element and the third surface of the second light emitting element are electrically connected, thereby realizing a configuration in which the first light emitting element and the second light emitting element are electrically connected in series.

[0145] (Appendix 3) the second conductive layer and the first support portion are fixed to each other via a conductive adhesive layer; The first heat dissipation fin and the second heat dissipation fin are spaced apart. 3. A light source device as described in claim 2.

[0146] With this configuration, the first heat dissipation fin and the second heat dissipation fin do not come into contact with each other, so that heat transfer between the first heat dissipation fin and the second heat dissipation fin is suppressed, and heat can be efficiently dissipated from each of the first heat dissipation fin and the second heat dissipation fin.

[0147] (Appendix 4) the first light emitting element has a pair of first anode electrodes arranged on the first surface with the first light emitting region therebetween, and a first cathode electrode provided on the second surface; The second light emitting element has a pair of second anode electrodes arranged on the third surface with the second light emitting region therebetween, and a second cathode electrode provided on the fourth surface. 4. A light source device according to claim 2 or 3.

[0148] According to this configuration, since each of the first light-emitting element and the second light-emitting element has a pair of anode electrodes sandwiching the light-emitting region, the current density supplied to each light-emitting region is stabilized, and each light-emitting region can emit light with uniform brightness. Therefore, the first light-emitting element and the second light-emitting element can emit light with uniform brightness from each light-emitting region.

[0149] (Appendix 5) the first light emitting element has a first anode electrode and a first cathode electrode provided on the second surface, the first light emitting element is disposed so as to straddle between the first support portion and the second support portion, the first anode electrode of the first light emitting element is electrically connected to the first support; the first cathode electrode of the first light emitting element is electrically connected to the second support; 2. A light source device as described in claim 1.

[0150] According to this configuration, the first light emitting element is disposed so as to straddle between the first heat sink and the second heat sink, so that heat from the first light emitting element can be efficiently released via the first heat sink.

[0151] (Appendix 6) the first support portion of the first heat sink and the second support portion of the second heat sink are fixed to each other via an insulating layer; The first heat dissipation fin and the second heat dissipation fin are spaced apart. 6. A light source device as described in appended claim 5.

[0152] With this configuration, the first and second heat sinks are held together in an insulated state, making it possible to reduce the size of the device. Also, since the adjacent first and second heat sinks do not contact each other, each heat sink can efficiently dissipate heat.

[0153] (Appendix 7) In an arrangement direction in which the first heat dissipating body and the second heat dissipating body are arranged, the first support portion has a thicker shape than the first heat dissipating fin, and the second support portion has a thicker shape than the second heat dissipating fin. 7. A light source device according to any one of claims 1 to 6.

[0154] According to this configuration, in the first heat sink and the second heat sink, the thickness of each heat sink fin is thinner than the thickness of each support portion, so that the heat dissipation performance of each heat sink fin can be further improved.

[0155] (Appendix 8) a pad portion provided on at least one of the first support portion and the second support portion for supplying power to the first light emitting element and the second light emitting element; 8. The light source device according to claim 7.

[0156] According to this configuration, since the pad portion is provided on the support portion, which is a thick portion of the heat sink, the pad portion can be held in a stable state, thereby improving the reliability of electrical continuity between the pad portion and each electrode of the power supply device even when the pad portion is misaligned or deformed.

[0157] (Appendix 9) In an arrangement direction in which the first heat sink and the second heat sink are aligned, the first heat sink fin is disposed on one side of the first support, and the second heat sink fin is disposed on one side of the second support. 8. The light source device according to claim 7.

[0158] With this configuration, a large gap can be secured between adjacent first and second heat dissipation fins in the arrangement direction, thereby suppressing heat transfer between the first and second heat dissipation fins and enabling heat to be dissipated efficiently from each heat dissipation fin.

[0159] (Appendix 10) a light guiding member into which light emitted from the plurality of light emitting elements is incident; an angle conversion member that converts the angular distribution of light emitted from the light guiding member; A support member having a groove portion for supporting the light guide member, 3. A light source device according to claim 1 or 2.

[0160] According to this configuration, in a configuration including a light guide member, an angle conversion member, and a support member, light from a plurality of light emitting elements can be efficiently incident on the light guide member.

[0161] (Appendix 11) the plurality of light-emitting elements emit a first light having a first wavelength band; The light guide member is a wavelength conversion member that includes a phosphor, converts the first light emitted from the plurality of light emitting elements into a second light having a second wavelength band different from the first wavelength band, and emits the second light. 11. The light source device according to claim 10.

[0162] According to this configuration, it is possible to realize a light source device that obtains second light having a desired intensity by allowing the first light to efficiently enter the light guide member.

[0163] (Appendix 12) A light source device according to any one of claims 1 to 11; a light modulation device that modulates the light emitted from the light source device in accordance with image information; a projection optical device that projects the light modulated by the light modulation device. projector.

[0164] According to a projector having this configuration, since it is equipped with a light source device that efficiently extracts bright light, it is possible to provide a projector with excellent light utilization efficiency. [Explanation of symbols]

[0165] 1...projector, 4B, 4G, 4R...light modulation device, 6...projection optical device, 50...wavelength conversion member, 52...angle conversion member, 54...support member, 71, 271...light emitting element, 71A, 271A...first light emitting element, 71B, 271B...second light emitting element, 80, 380...heat sink, 81, 381...heat sink, 81A, 381A...first heat sink, 81B, 381B...second heat sink, 90...pad portion, 100...light source device, 154...groove portion, 171, 371...first surface, 171a, 371a...first light emitting region, 171b, 372a...first anode electrode, 172, 372...second No. 2 surface, 172b, 372b...first cathode electrode, 173, 373...third surface, 173a, 373a...second light-emitting region, 173b, 374a...second anode electrode, 174, 374...fourth surface, 174b, 374b...second cathode electrode, 181, 481...first support portion, 182, 482...first heat dissipation fin, 183, 481ba...second support portion, 184...second heat dissipation fin, 185...support portion, 186...first conductive layer, 186a...first insulating layer, 187...second conductive layer, 187a...second insulating layer, 189...insulating member, E, E2...excitation light (first light), Y...fluorescence (second light).

Claims

1. A plurality of light emitting elements including a first light emitting element and a second light emitting element; a heat sink including a plurality of heat sink members including a first heat sink and a second heat sink; the heat sink holds the plurality of light emitting elements in a state in which the light emitting elements are electrically connected in series; The first light emitting element has a first surface including a first light emitting region and a second surface provided on the opposite side of the first surface and including at least one electrode; the second light emitting element has a third surface including a second light emitting region, and a fourth surface provided on the opposite side of the third surface and including at least one electrode; the first heat sink includes a first support portion that supports the second surface of the first light emitting element and is electrically connected to the first light emitting element, and a first heat dissipation fin that extends on a side of the first support portion opposite to the first light emitting element, the second heat sink includes a second support portion that supports the fourth surface of the second light emitting element and is electrically connected to the second light emitting element, and a second heat dissipation fin that extends on a side of the second support portion opposite to the second light emitting element, the first light emitting element and the second light emitting element are electrically connected via the first support portion of the first heat sink and the second support portion of the second heat sink; Light source device.

2. the first heat sink is provided in a region of the first support portion different from a support region of the first light emitting element via a first insulating layer, and further includes a first conductive layer electrically connected to the first surface of the first light emitting element; the second heat sink is provided in a region of the second support portion different from a support region of the second light emitting element via a second insulating layer, and further includes a second conductive layer electrically connected to the third surface of the second light emitting element; the second conductive layer of the second support portion abuts against the first support portion, thereby electrically connecting the third surface of the second light-emitting element and the second surface of the first light-emitting element. The light source device according to claim 1 .

3. the second conductive layer and the first support portion are fixed to each other via a conductive adhesive layer; The first heat dissipating fin and the second heat dissipating fin are spaced apart. The light source device according to claim 2 .

4. the first light emitting element has a pair of first anode electrodes arranged on the first surface with the first light emitting region therebetween, and a first cathode electrode provided on the second surface; The second light emitting element has a pair of second anode electrodes arranged on the third surface with the second light emitting region therebetween, and a second cathode electrode provided on the fourth surface. The light source device according to claim 2 or 3.

5. the first light emitting element has a first anode electrode and a first cathode electrode provided on the second surface, the first light emitting element is disposed so as to straddle between the first support portion and the second support portion, the first anode electrode of the first light emitting element is electrically connected to the first support; The first cathode electrode of the first light emitting element is electrically connected to the second support portion. The light source device according to claim 1 .

6. the first support portion of the first heat dissipation body and the second support portion of the second heat dissipation body are fixed to each other via an insulating member, The first heat dissipating fin and the second heat dissipating fin are spaced apart. The light source device according to claim 5 .

7. In an arrangement direction in which the first heat dissipating body and the second heat dissipating body are arranged, the first support portion has a thicker shape than the first heat dissipating fin, and the second support portion has a thicker shape than the second heat dissipating fin. The light source device according to claim 1 or 2.

8. a pad portion provided on at least one of the first support portion and the second support portion, the pad portion supplying power to the first light emitting element and the second light emitting element; The light source device according to claim 7.

9. In an arrangement direction in which the first heat sink and the second heat sink are arranged, the first heat sink fin is disposed on one side of the first support portion, and the second heat sink fin is disposed on one side of the second support portion. The light source device according to claim 1 or 2.

10. a light guiding member into which light emitted from the plurality of light emitting elements is incident; an angle conversion member that converts the angular distribution of light emitted from the light guiding member; A support member having a groove portion for supporting the light guide member, The light source device according to claim 1 or 2.

11. the plurality of light-emitting elements emit first light having a first wavelength band; The light guide member is a wavelength conversion member that includes a phosphor, converts the first light emitted from the plurality of light emitting elements into a second light having a second wavelength band different from the first wavelength band, and emits the second light. The light source device according to claim 10.

12. The light source device according to claim 11 ; a light modulation device that modulates the light emitted from the light source device in accordance with image information; a projection optical device that projects the light modulated by the light modulation device. projector.

Images