Light source device and projector

Abstract

To provide a light source device and a projector capable of improving light utilization efficiency.SOLUTION: A light source device of the present invention comprises: a light source unit; a light guide member on which light from the light source is incident; and a support member that has the light guide member. The light guide member has a first surface and a second surface, a third surface and a fourth surface intersecting the first surface and the second surface and located on the opposite sides to each other, and a fifth surface and a sixth surface intersecting the first surface, the second surface, the third surface, and the fourth surface and located on the opposite sides to each other. A light emitting device is provided to face the third surface. The light guide member emits light from the first surface. A support groove includes a support surface supporting the fourth surface, a first wall surface facing the fifth surface, and a second wall surface facing the sixth surface. The light source unit is arranged so that a substrate faces a first side wall and a second side wall. When a virtual plane connecting a first top face and a second top face is set, a light emitting surface of the light emitting device is located on the side of the third surface of the light guide member with respect to the virtual plane.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] A light source device has been proposed for use in a projector that utilizes fluorescence emitted from a phosphor when the phosphor is irradiated with excitation light emitted from a light-emitting element. Patent Document 1 listed below discloses a light source device that includes an excitation light source having multiple light-emitting elements mounted on a substrate, a phosphor rod that converts the excitation light emitted from each light-emitting element of the excitation light source into fluorescence, and a holder that holds the phosphor rod. In this light source device, the light-emitting surface of the light-emitting element is positioned away from the upper surface of the holder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-75614 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned light source device, there was a risk that the light utilization efficiency would decrease because the light emitted from the light-emitting element and the light emitted from the light-emitting element and reflected without entering the phosphor rod would leak through the gap between the light source unit and the top surface of the holder. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, a light source device according to one aspect of the present invention includes a light source unit having a light-emitting element that emits light from a light-emitting surface and a substrate that supports the light-emitting element, a light-guiding member into which the light emitted from the light-emitting element is incident, and a support member having a support groove that supports the light-guiding member, wherein the light-guiding member has a first surface and a second surface that are located opposite to each other in a longitudinal direction of the light-guiding member, a third surface and a fourth surface that intersect with the first surface and the second surface, respectively, and are located opposite to each other, and a fifth surface and a sixth surface that intersect with the first surface and the second surface, and intersect with the third surface and the fourth surface, respectively, and are located opposite to each other; the light source unit is disposed relative to the support member such that the substrate faces the first top surface of the first side wall and the second top surface of the second side wall, and when an imaginary plane connecting the first top surface and the second top surface is set, the light emitting surface of the light emitting element is located on the third surface side of the light guiding member with respect to the imaginary plane.

[0006] A projector according to one aspect of the present invention comprises a light source device according to one aspect of the present invention, an optical 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 optical modulation device. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a projector according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating the configuration of a first lighting device. [Figure 3] FIG. 2 is a plan view showing a schematic configuration of a light source unit. [Figure 4] FIG. 2 is a plan view of the light source device as seen from the Y-axis direction. [Figure 5] 5 is a cross-sectional view of the light source device taken along line VV in FIG. 4. [Figure 6] FIG. 10 is a cross-sectional view of a light source device according to a first modified example. [Figure 7] FIG. 10 is a cross-sectional view of a light source device according to a second modified example. [Figure 8] FIG. 11 is a cross-sectional view of a light source device according to a third modified example. [Figure 9] FIG. 10 is a cross-sectional view of a light source device according to a fourth modified example. [Figure 10] FIG. 11 is a cross-sectional view of a light source device according to a fifth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described below. 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 below, the dimensions of some components may be shown on different scales to make them easier to see.

[0009] FIG. 1 is a diagram showing a schematic configuration of a projector 1 according to this 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 is equipped with three light modulation devices corresponding to 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, the drawings will be described using an XYZ Cartesian coordinate system 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 illumination device 20 and the optical axis AX2 of the second illumination device 21. The Y axis is an axis perpendicular to the X and Z axes. The optical axis AX1 of the first illumination device 20 is the central axis of the fluorescent light Y emitted from the first illumination device 20. The optical axis AX2 of the second illumination device 21 is the central axis of the blue light LB emitted from the second illumination device 21. One direction along the X axis is referred to as the +X direction, and the opposite direction is referred to as the -X direction. One direction along the Y axis is referred to as the +Y direction, and the opposite direction is referred to as the -Y direction. One direction along the Z axis is referred to as the +Z direction, and the opposite direction is referred to as the -Z direction. In addition, the two directions along the X axis are collectively referred to as the X-axis direction without distinction, the two directions along the Y axis are collectively referred to as the Y-axis direction without distinction, and the two directions along the Z axis are collectively referred to as the Z-axis direction without distinction.

[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 by 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 toward the light modulation device 4B.

[0016] The second illumination device 21 includes a second light source 81, a condenser lens 82, a diffuser plate 83, a rod lens 84, and a relay lens 85. The second light source 81 is configured with at least one semiconductor laser. The second light source 81 emits blue light LB made of laser light. The second light source 81 is not limited to a semiconductor laser, and may be an LED that emits blue light.

[0017] The condenser lens 82 is composed of a convex lens. The condenser lens 82 causes the blue light LB emitted from the second light source 81 to enter the diffuser plate 83 in a substantially condensed state. The diffuser plate 83 diffuses the blue light LB emitted from the condenser lens 82 with a predetermined degree of diffusion, generating blue light LB having a substantially uniform luminous intensity distribution similar to that of the fluorescent light Y emitted from the first lighting device 20. The diffuser plate 83 may be, for example, frosted glass made of optical glass.

[0018] The blue light LB diffused by the diffuser plate 83 is incident on the rod lens 84. The rod lens 84 has a rectangular columnar shape extending along the optical axis AX2 of the second illumination device 21. The rod lens 84 has a light incident end surface 84a at one end and a light exit end surface 84b at the other end. The diffuser plate 83 is fixed to the light incident end surface 84a of the rod lens 84 via an optical adhesive (not shown). It is desirable that the refractive index of the diffuser plate 83 and the refractive index of the rod lens 84 match as closely as possible.

[0019] The blue light LB propagates through the rod lens 84 while being totally reflected inside the rod lens 84, and is emitted from the light emitting end surface 84b with an increased uniformity of illuminance distribution. The blue light LB emitted from the rod lens 84 is incident on the relay lens 85. The relay lens 85 causes the blue light LB, whose uniformity of illuminance distribution has been increased by the rod lens 84, to be incident on the reflecting mirror 9.

[0020] The shape of the light exit end surface 84b of the rod lens 84 is a rectangle that is approximately similar to the shape of the image forming area of ​​the light modulation device 4B, so that the blue light LB exiting from the rod lens 84 is efficiently incident on 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] Each of the light modulation devices 4R, 4G, and 4B uses, for example, a transmissive liquid crystal panel. Polarizing plates (not shown) are disposed on the entrance and exit sides of the liquid crystal panels. The polarizing plates allow only linearly polarized light in a specific direction to pass through.

[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 lights emitted from the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, combines the image lights 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, thereby displaying a color image on the screen SCR.

[0026] Next, the configuration of the first illumination device 20 will be described. FIG. 2 is a schematic diagram of the first illumination device 20. As shown in FIG. As shown in FIG. 2, the first illumination device 20 includes a light source device 100, a collimating optical system 63, an integrator optical system 80, a polarization conversion element 102, and a superimposing optical system 103.

[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 position restriction unit 65, and a pair of pressing members 90. The wavelength conversion member 50 of this embodiment corresponds to the "light guide member" in the claims.

[0028] The wavelength conversion member 50 has a quadrangular prism shape extending along the X-axis and has six faces. The side of the wavelength conversion member 50 extending along the X-axis is longer than the side extending along the Y-axis and the side extending along the Z-axis. Therefore, the X-axis corresponds to the 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 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 YZ plane may also be rectangular. In this embodiment, the X-axis direction in which the wavelength conversion member 50 extends corresponds to the "longitudinal direction of the wavelength conversion member" in the claims.

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

[0030] The third surface 50c and the fourth surface 50d intersect with the first surface 50a and the second surface 50b, respectively, and intersect with the X-axis along the longitudinal direction of the wavelength conversion member 50. In this embodiment, the third surface 50c is located on the -Y side, which is one side of the Y-axis direction along the Y-axis, and the fourth surface 50d is located on the +Y side, which is the other side of the Y-axis direction.

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

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

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

[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 fluorescent light Y. The second waveband of the fluorescent light Y is, for example, a yellow waveband of 490 to 750 nm. That is, the fluorescent light 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. A wavelength conversion member 50 made of such a material converts the excitation light E into fluorescent light 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 includes a substrate 71 and a plurality of light emitting elements 72. The substrate 71 includes a front surface 71a and a back surface 71b opposite to the front surface 71a. The plurality of light emitting elements 72 are provided on a surface 71a of the substrate 71. The light source unit 70 of this embodiment has a plurality of light emitting elements 72, but the number of light emitting elements 72 is not particularly limited.

[0038] Each light-emitting element 72 has a light-emitting surface 72a that faces the third surface 50c of the wavelength converting member 50 and emits excitation light E of a first wavelength band toward the third surface 50c. The first wavelength band is, for example, a wavelength band from blue to violet, ranging from 400 nm to 480 nm, and has a peak wavelength of, for example, 445 nm. In this way, each light-emitting element 72 of the light source section 70 is arranged so that the light-emitting surface 72a faces the third surface 50c, which is one of the four side surfaces 50c, 50d, 50e, and 50f along the longitudinal direction of the wavelength conversion member 50.

[0039] 3 is a plan view showing a schematic configuration of the light source section 70. FIG. 3 is a plan view of a surface 71a of a substrate 71 of the light source section 70. 3, the substrate 71 has a substantially rectangular shape. A plurality of light-emitting elements 72 are arranged on a surface 71a of the substrate 71. Each light-emitting element 72 is formed of, for example, a light-emitting diode (LED).

[0040] Each light-emitting element 72 has a light-emitting surface 72a, two anode electrodes 72b, and one cathode electrode 72c. In each light-emitting element 72, the light-emitting surface 72a and the two anode electrodes 72b are provided on the surface facing away from the substrate 71, and the cathode electrode 72c is provided on the back surface facing the substrate 71, opposite the front surface. In this embodiment, each light-emitting element 72 has two anode electrodes 72b on either side of the light-emitting surface 72a, which stabilizes the current density supplied to the light-emitting surface 72a and allows the light-emitting surface 72a to emit uniform light. Therefore, each light-emitting element 72 can emit uniform, bright light from the light-emitting surface 72a.

[0041] Terminal portions 73 electrically connected to the light-emitting elements 72 are provided on the surface 71a of the substrate 71. The terminal portions 73 include a first conductive portion 73a electrically connected to the anode electrodes 72b of the light-emitting elements 72 and a second conductive portion 73b electrically connected to the cathode electrodes 72c of the light-emitting elements 72. Although details are omitted, the first conductive portion 73a and the second conductive portion 73b are configured to connect the light-emitting elements 72 in series. Therefore, a current flows sequentially through the light-emitting elements 72 along the X-axis direction.

[0042] Specifically, each anode electrode 72b of each light-emitting element 72 is connected to a first conductive portion 73a of the terminal portion 73 via a metal wire 74. The metal wire 74 is provided using a wire bonding device. Each light-emitting element 72 is mounted in such a direction that the cathode electrode 72c is placed on the second conductive portion 73b of the terminal portion 73. A solder layer, for example, is provided between the cathode electrode 72c and the second conductive portion 73b. The terminal portion 73 is connected to a wiring portion not shown, and each light-emitting element 72 is electrically connected to an external device via the metal wire 74, the terminal portion 73, and the wiring portion, so that driving power, etc. can be supplied. In this way, each light emitting element 72 can simply and accurately establish electrical continuity between the substrate 71 and the light emitting element 72 via the metal wire 74 .

[0043] Returning to FIG. 2 , the support member 54 extends in the X-axis direction along the longitudinal direction of the wavelength conversion member 50, and has support grooves 154 that support the wavelength conversion member 50. The support member 54 diffuses and releases heat generated by the wavelength conversion member 50 supported in the support grooves 154 to the outside. For this reason, it is desirable that the support member 54 be made of a material that has a predetermined strength and high thermal conductivity. As the material for the support member 54, for example, metal such as aluminum or stainless steel is used, and in particular, it is desirable to use an aluminum alloy such as a 6061 series.

[0044] The wavelength conversion member 50 of this embodiment includes a first protrusion 151 that protrudes from the support groove 154 in the +X direction, and a second protrusion 152 that protrudes from the support groove 154 in the -X direction. In other words, a part of the wavelength conversion member 50 of this embodiment protrudes outside the support groove 154. The position restricting portion 65 holds the first protruding portion 151 and the second protruding portion 152 of the wavelength converting member 50. The position restricting portion 65, together with the pair of pressing members 90, restricts the position of the wavelength converting member 50 relative to the supporting member .

[0045] The pair of pressing members 90 are disposed opposite the support surfaces 154s of the support groove 154. As a result, the pair of pressing members 90 restrict movement of the wavelength conversion member 50 in the Y-axis direction within the support groove 154. The pair of pressing members 90 are made of an elastically deformable material. As an example, the pair of pressing members 90 are made of leaf springs made of a metal material, for example, a stainless steel material such as SUS304.

[0046] The pair of pressing members 90 are disposed between the wavelength conversion member 50 and the substrate 71, and press the wavelength conversion member 50 against the support surfaces 154s of the support grooves 154 of the support member 54. The pair of pressing members 90 are fixed to the support member 54. The pair of pressing members 90 are disposed so as to overlap with the gaps S provided in the light emitting elements 72 aligned in the X-axis direction in a plan view. Therefore, the pair of pressing members 90 do not overlap with the light emitting surfaces 72a of the light emitting elements, and do not block the excitation light E emitted from the light emitting elements 72.

[0047] The mirror 53 is provided on the second surface 50b of the wavelength conversion member 50. The mirror 53 guides light inside the wavelength conversion member 50 and reflects the fluorescence Y that reaches the second surface 50b. The mirror 53 is made of a metal film or a dielectric multilayer film formed on the second surface 50b of the wavelength conversion member 50.

[0048] In the first lighting device 20, when excitation light E emitted from the light source unit 70 enters the wavelength conversion member 50, phosphors contained within the wavelength conversion member 50 are excited, and fluorescence Y is emitted from any light-emitting point. The fluorescence Y travels in all directions from any light-emitting point, but the fluorescence Y traveling toward the four side surfaces 50c, 50d, 50e, and 50f travels toward the first surface 50a or the second surface 50b while repeatedly undergoing total reflection at multiple locations on the side surfaces 50c, 50d, 50e, and 50f. The first surface 50a emits the fluorescence Y that has been guided through the wavelength conversion member 50 by propagation due to total reflection. In this embodiment, the fluorescence Y traveling toward the first surface 50a enters the angle conversion member 52 provided on the first surface 50a. The fluorescence Y traveling toward the second surface 50b is reflected by the mirror 53 and travels toward the first surface 50a.

[0049] Of the excitation light E incident on the wavelength conversion member 50, a portion of the excitation light E that is not used to excite the phosphor is reflected by the members surrounding the wavelength conversion member 50, including the light source unit 70, or by the mirror 53 provided on the second surface 50b. Therefore, a portion of the excitation light E is trapped inside the wavelength conversion member 50 and reused for fluorescence conversion.

[0050] The angle conversion member 52 is provided on the first surface 50a of the wavelength conversion member 50. The angle conversion member 52 is formed, for example, from 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.

[0051] The angle conversion member 52 has a truncated quadrangular pyramid shape, and the cross-sectional area perpendicular to the optical axis J expands along the direction in which light travels. Therefore, the area of ​​the light exit surface 52b is larger than the area of ​​the light incident surface 52a. The optical axis J of the angle conversion member 52 is an 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. The optical axis J of the angle conversion member 52 coincides with the optical axis AX1 of the first lighting device 20.

[0052] The fluorescence Y that has entered the angle conversion member 52 changes direction each time it is totally reflected by the side surface 52c while traveling inside the angle conversion member 52 so that it approaches 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 that is emitted from the first surface 50a of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum emission angle of the fluorescence Y on the light emission surface 52b smaller than the maximum incidence angle of the fluorescence Y on the light incidence surface 52a.

[0053] 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 passing 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. Therefore, from the standpoint 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.

[0054] The angle conversion member 52 is fixed to the wavelength conversion member 50 via an optical adhesive (not shown) so that the light incident surface 52a faces the first surface 50a of the wavelength conversion member 50. That is, the angle conversion member 52 and the wavelength conversion member 50 are in contact with each other via the optical adhesive, and no gap, such as an air layer, is provided between the angle conversion member 52 and the wavelength conversion member 50. If a gap were 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 that is incident on the light incident surface 52a at an angle equal to or greater than the critical angle would be totally reflected by the light incident surface 52a and would not be able to enter 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 enter the angle conversion member 52 due to total reflection can be reduced. From this perspective, it is desirable to match the refractive index of the angle conversion member 52 with the refractive index of the wavelength conversion member 50 as closely as possible.

[0055] A compound parabolic concentrator (CPC) may be used as the angle conversion member 52 instead of a 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.

[0056] The collimating optical system 63 is composed of a collimator lens and the like, and is provided between the light source device 100 and the integrator optical system 80. The collimating optical system 63 further narrows the angular distribution of the fluorescence Y emitted from the light source device 100, and causes the highly parallel fluorescence Y to enter the integrator optical system 80. Note that the collimating optical system 63 does not need to be provided if the parallelism of the fluorescence Y emitted from the angle conversion member 52 is sufficiently high.

[0057] The integrator optical system 80 has a first lens array 61 and a second lens array 101. The integrator optical system 80, together with the superimposing optical system 103, functions as a uniform illumination optical system that uniformizes the intensity distribution of the fluorescence Y emitted from the light source device 100 in each of the light modulation devices 4R and 4G, which are the illuminated areas. The fluorescence Y emitted from the collimating optical system 63 is incident on the first lens array 61. The first lens array 61, together with the second lens array 101 provided downstream of the light source device 100, constitutes the integrator optical system 80.

[0058] 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, which is orthogonal 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 beams. The shape of each of the first small lenses 61a is rectangular, which is approximately similar to the shape of the image formation areas of the light modulation devices 4R and 4G. This allows each of the partial beams emitted from the first lens array 61 to efficiently enter the image formation areas of the light modulation devices 4R and 4G.

[0059] The fluorescence Y emitted from the first lens array 61 travels toward the second lens array 101. The second lens array 101 is disposed opposite the first lens array 61. The second lens array 101 has a plurality of second small lenses 101a corresponding to the plurality of first small lenses 61a of the first lens array 61. The second lens array 101, together with the superimposing optical system 103, forms images of the plurality of first small lenses 61a of the first lens array 61 near the image forming areas of the light modulation devices 4R, 4G. The plurality of second small lenses 101a are arranged in a matrix in a plane parallel to the YZ plane that is perpendicular to the optical axis AX1 of the first illumination device 20.

[0060] In this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 101a of the second lens array 101 have the same size, but may have different sizes. Also, in this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 101a of the second lens array 101 are arranged so that their optical axes coincide with each other, but they may be arranged eccentrically with each other.

[0061] The polarization conversion element 102 converts the polarization direction of the fluorescence Y emitted from the second lens array 101. Specifically, the polarization conversion element 102 converts each partial light beam of the fluorescence Y split by the first lens array 61 and emitted from the second lens array 101 into linearly polarized light.

[0062] The polarization conversion element 102 has a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the fluorescence Y emitted from the light source device 100 as is and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1, a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1, and a retardation plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

[0063] The fluorescence Y that has passed through the polarization conversion element 102 enters the superimposing optical system 103. The superimposing optical system 103 cooperates with the integrator optical system 80 to form a uniform illumination optical system that uniforms the intensity distribution of the fluorescence Y in each of the light modulation devices 4R and 4G, which are the illuminated regions.

[0064] Fig. 4 is a plan view of light source device 100 as viewed from the Y-axis direction. Fig. 5 is a cross-sectional view of light source device 100 taken along line VV in Fig. 4. Note that in Fig. 4, for ease of viewing, only the outline of light source unit 70 is shown, and the detailed configuration is not shown, whereas Fig. 5 illustrates light source unit 70. Also, in Fig. 5, for ease of viewing, the position restriction unit 65 and the pressing member 90 are not shown.

[0065] As shown in FIG. 4, the support member 54 has a support groove 154, 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, and is a plate-like member having a rectangular planar shape.

[0066] 5, the support groove 154 of the support member 54 has a U-shaped cross section perpendicular to the X-axis direction. The support groove 154 is formed by cutting the metal, such as aluminum or stainless steel, that is the constituent material of the support member 54.

[0067] The support member 54 includes a bottom wall 140, a first side wall 141, and a second side wall 142. The bottom wall 140 has a support surface 154s that forms the bottom surface of the support groove 154. In the present embodiment, the support surface 154s is a surface parallel to the XZ plane, and supports the fourth surface 50d of the wavelength conversion member 50.

[0068] The first side wall 141 has a first wall surface 154a that forms one side surface of the support groove 154. The first wall surface 154a faces the fifth surface 50e of the wavelength conversion member 50 and is spaced apart from the fifth surface 50e. That is, a gap is provided between the first wall surface 154a and the fifth surface 50e of the wavelength conversion member 50. The first side wall 141 has a first apex 55 that forms the upper part of the support groove 154. A first apex surface 55a, which is the tip of the first apex 55, is a surface parallel to the XZ plane and is the surface farthest from the support surface 154s in the Y-axis direction.

[0069] The second side wall 142 has a second wall surface 154b that forms the other side surface of the support groove 154. The second wall surface 154b faces the sixth surface 50f of the wavelength converting member 50 and is spaced apart from the sixth surface 50f. That is, a gap is provided between the second wall surface 154b and the sixth surface 50f of the wavelength converting member 50. The second side wall 142 has a second apex 57 that forms the upper part of the support groove 154. A second apex surface 57a, which is the tip of the second apex 57, is a surface parallel to the XZ plane and is the surface farthest from the support surface 154s in the Y-axis direction.

[0070] The support groove 154 of this embodiment is composed of a support surface 154s, a first wall surface 154a of the first side wall 141, and a second wall surface 154b of the second side wall 142.

[0071] The first top portion 55 of the first side wall 141 has a first cutout portion 56 provided at a corner on the support groove 154 side. That is, the first cutout portion 56 cuts out a part of the first top surface 55a and the first wall surface 154a. The first cutout portion 56 forms an accommodation space that accommodates the metal wire 74 connected to one side of the light emitting element 72. That is, the first cutout portion 56 suppresses interference between the metal wire 74 and the support member 54. In the present embodiment, the support groove 154 has a first notch 56 formed in the upper part of the first wall surface 154a of the first side wall 141, thereby increasing the width in the Z-axis direction.

[0072] On the support surface 154s side of the first cutout 56, the first wall surface 154a has a first portion 54a1 located on the third surface 50c side and a second portion 54a2 located on the support surface 154s side. The first portion 54a1 extends perpendicular to the support surface 154s, i.e., parallel to the XY plane. The second portion 54a2 slopes toward the fifth surface 50e from the first portion 54a1 side toward the support surface 154s side. In other words, the distance between the second portion 54a2 on the support surface 154s side and the fifth surface 50e is shorter than the distance between the second portion 54a2 on the first portion 54a1 side and the fifth surface 50e.

[0073] The second top portion 57 of the second side wall 142 has a second cutout portion 58 provided at the corner on the support groove 154 side. That is, the second cutout portion 58 cuts out a part of the second top surface 57a and the second wall surface 154b. The second cutout portion 58 forms an accommodation space that accommodates the metal wire 74 connected to the other side of the light-emitting element 72. That is, the second cutout portion 58 suppresses interference between the metal wire 74 and the support member 54. In the present embodiment, the support groove 154 has a second notch 58 formed in the upper portion of the second wall surface 154b of the second side wall 142, thereby increasing the width in the Z-axis direction.

[0074] On the support surface 154s side of the second cutout 58, the second wall surface 154b has a third portion 54b3 located on the third surface 50c side and a fourth portion 54b4 located on the support surface 154s side. The third portion 54b3 extends perpendicular to the support surface 154s, i.e., parallel to the XY plane. The fourth portion 54b4 is inclined toward the sixth surface 50f from the third portion 54b3 side toward the support surface 154s side. In other words, the distance between the fourth portion 54b4 and the sixth surface 50f on the support surface 154s side is shorter than the distance between the fourth portion 54b4 and the sixth surface 50f on the third portion 54b3 side.

[0075] Each of the first wall surface 154a and the second wall surface 154b is made of a metal surface, such as aluminum or stainless steel, which is the material of the support member 54. More specifically, each of the first wall surface 154a and the second wall surface 154b is made of a mirror-finished surface of the metal surface. Therefore, each of the first wall surface 154a and the second wall surface 154b has optical reflectivity and reflects the incident excitation light E. Note that each of the first wall surface 154a and the second wall surface 154b may be made of another metal film or a dielectric multilayer film formed on the surface of a metal, such as aluminum or stainless steel.

[0076] The dimension W1 along the Z-axis direction of the light-emitting surface 72a of the light-emitting element 72 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 entire longitudinal direction. As a result, in the Z-axis direction, both ends of the light-emitting surface 72a of the light-emitting element 72 protrude outside the third surface 50c of the wavelength conversion member 50. Specifically, both ends of the light-emitting surface 72a of the light-emitting element 72 protrude to positions where they overlap with the gap between the fifth surface 50e and the first wall surface 154a and the gap between the sixth surface 50f and the second wall surface 154b. In other words, when the light-emitting surface 72a is viewed along the Y-axis direction from the support surface 154s, a portion of the light-emitting surface 72a overlaps with the third surface 50c, and another portion of the light-emitting surface 72a overlaps with the gap between the fifth surface 50e and the first wall surface 154a and the gap between the sixth surface 50f and the second wall surface 154b.

[0077] The width D2 of the support surface 154s 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 154s in the Z-axis direction protrude outside the fourth surface 50d of the wavelength conversion member 50. In other words, when the support surface 154s is viewed from the light-emitting surface 72a along the Y-axis direction, a part of the support surface 154s overlaps with the fourth surface 50d, and another part of the support surface 154s is exposed outside the fourth surface 50d. In this way, the support surface 154s has an exposed portion 54r exposed to the outside of the wavelength conversion member 50.

[0078] According to the light source device 100 of the present embodiment, a portion of the excitation light E2 emitted from the light-emitting surface 72a of the light-emitting element 72 travels through the gap between the fifth 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 154s. At this time, the excitation light E2 is reflected by the second portion 54a2 and enters the fifth surface 50e of the wavelength conversion member 50. In this way, the excitation light E2 passing through the gap between the fifth surface 50e of the wavelength conversion member 50 and the first wall surface 154a is more likely to be incident on the fifth surface 50e, thereby reducing the amount of excitation light E reflected by the support surface 154s and returning to the light source unit 70. In addition, some of the excitation light E is reflected by the first portion 54a1 extending perpendicular to the support surface 154s and is incident on the fifth surface 50e of the wavelength conversion member 50. This makes it possible to realize a light source device 100 that has high utilization efficiency of the excitation light E and that makes it easy to obtain fluorescence Y with a desired intensity.

[0079] 4, the spring fixing portions 540 are arranged on both sides of the support groove 154 in the Z-axis direction along the short side of the wavelength conversion member 50. The spring fixing portions 540 fix, with screws 96, both ends of a pair of pressing members 90 arranged to straddle the wavelength conversion member 50 in the Z-axis direction.

[0080] The first accommodating portion 541 is a recess that communicates with the support groove 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 protrusion 151 of the wavelength conversion member 50 that protrudes from the support groove 154. The first accommodating portion 541 also holds the angle conversion member 52 fixed to the first surface 50a of the wavelength conversion member 50. In this embodiment, the angle conversion member 52 fixed to the first surface 50a of the first protrusion 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.

[0081] The second accommodating portion 542 is a recess that communicates with the support groove 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 protrusion 152 of the wavelength converting member 50 that protrudes from the support groove 154. The second accommodating portion 542 is provided in a state that does not communicate with the outer edge 54d of the support member 54. The second accommodating portion 542 accommodates the second protrusion 152 of the wavelength converting member 50 that protrudes from the support groove 154. In this embodiment, the mirror 53 is provided on the second surface 50b of the second protrusion 152. The second accommodating portion 542 accommodates the mirror 53 that is provided on the second surface 50b of the wavelength converting member 50.

[0082] 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 the position restricting portion 65 that holds the +Z side of the first protrusion 151 of the wavelength converting member 50 accommodated in the first accommodating portion 541.

[0083] The fourth accommodating portion 544 is a recess that communicates with the first accommodating portion 541 in the -Z direction. The fourth accommodating portion 544 accommodates the position restricting portion 65 that holds the -Z side of the first protrusion 151 of the wavelength converting member 50 accommodated in the first accommodating portion 541.

[0084] The fifth accommodating portion 545 is a recess that communicates with the second accommodating portion 542 in the +Z direction. The fifth accommodating portion 545 accommodates the position restricting portion 65 that holds the +Z side of the second protrusion 152 of the wavelength converting member 50 accommodated in the second accommodating portion 542.

[0085] 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 the position restricting portion 65 that holds the -Z side of the second protrusion 152 of the wavelength converting member 50 accommodated in the second accommodating portion 542.

[0086] The position restricting portion 65 holds the first protruding portion 151 or the second protruding portion 152 protruding from the support groove 154 of the support member 54, and restricts the position of the first protruding portion 151 or the second protruding portion 152 relative to the support groove 154. The position restricting portion 65 includes a pair of restricting members 651, 652 that hold the first protruding portion 151, and a pair of restricting members 653, 654 that hold the second protruding portion 152.

[0087] One restriction member 651 that holds the first protrusion 151 is fixed to the third housing portion 543 via a screw 97, and the other restriction member 652 is fixed to the fourth housing portion 544 via a screw 97. One restriction member 653 that holds the second protrusion 152 is fixed to the fifth housing portion 545 via a screw 97, and the other restriction member 654 is fixed to the sixth housing portion 546 via a screw 97.

[0088] The pair of regulating members 651, 652 can adjust their positions in the Z axis direction by an adjustment mechanism (not shown). Similarly, the pair of regulating members 653, 654 can adjust their positions in the Z axis direction by an adjustment mechanism (not shown).

[0089] In this way, the wavelength conversion member 50 of this embodiment is held within the support groove 154 with the movement in the Z-axis direction of the first protrusion 151 and the second protrusion 152 protruding outside the support groove 154 being restricted by the position restriction portion 65.

[0090] In this embodiment, the light source unit 70 is disposed relative to the support member 54 so that the substrate 71 faces the first top surface 55a of the first side wall 141 and the second top surface 57a of the second side wall 142.

[0091] Here, an imaginary plane parallel to the XZ plane connecting the first top surface 55a and the second top surface 57a is set as an imaginary plane KM. For example, a comparative example will be described in which the light emitting surface 72a of each light emitting element 72 is disposed on the opposite side of the wavelength converting member 50 with respect to the imaginary plane KM. Because the excitation light E is emitted radially from the light-emitting surface 72a of each light-emitting element 72, the component of the excitation light E emitted from the light-emitting surface 72a at a large radiation angle travels approximately parallel to the light-emitting surface 72a. At this time, the first side wall 141 and the second side wall 142 are not disposed on the optical path of the excitation light E emitted in a direction approximately parallel to the light-emitting surface 72a and perpendicular to the long side direction of the wavelength conversion member 50. Therefore, the excitation light E passes through gaps between the first side wall 141 and the second side wall 142 and the substrate 71 and is emitted to the outside. Therefore, there is a risk that the amount of excitation light E incident on the wavelength conversion member 50 will decrease.

[0092] In contrast, in the light source device 100 of this embodiment, the light-emitting surface 72a of each light-emitting element 72 is located on the third surface 50c side of the wavelength conversion member 50 with respect to the imaginary plane KM. That is, the light-emitting surface 72a of each light-emitting element 72 is disposed closer to the support surface 154s side of the support groove 154 than the first top surface 55a and the second top surface 57a. Therefore, the first side wall 141 and the second side wall 142 are disposed on the optical path of the excitation light E emitted in the Z-axis direction, which is substantially parallel to the light-emitting surface 72a and perpendicular to the long side direction of the wavelength conversion member 50. Therefore, the excitation light E is reflected by the first side wall 141 or the second side wall 142, returned into the support groove 154, and then incident on the wavelength conversion member 50. Therefore, the excitation light E is less likely to be emitted to the outside through gaps between the first side wall 141 or the second side wall 142 and the substrate 71, and a decrease in the amount of excitation light E incident on the wavelength conversion member 50 can be suppressed.

[0093] In the light source device 100 of this embodiment, the surface 71a of the substrate 71 of the light source unit 70 abuts against the first top surface 55a and the second top surface 57a. With this configuration, the support groove 154 can be closed in the Z axis direction by the substrate 71, thereby preventing leakage of excitation light E from gaps between the substrate 71 and the first side wall 141 and the second side wall 142 in the Z axis direction. The excitation light E confined within the support groove 154 is reflected by the wall surfaces 154a and 154b of the support groove 154 and eventually enters the wavelength conversion member 50 to be used for fluorescence conversion. Therefore, the light source device 100 of this embodiment can improve the light utilization efficiency of the excitation light E.

[0094] As described above, the light source device 100 of this embodiment includes a light source section 70 having a light-emitting element 72 that emits excitation light E from a light-emitting surface 72a and a substrate 71 that supports the light-emitting element 72, a wavelength conversion member 50 onto which the excitation light E emitted from the light-emitting element 72 is incident, and a support member 54 having a support groove 154 that supports the wavelength conversion member 50. The wavelength conversion member 50 has a first surface 50a and a second surface 50b located opposite each other in the X-axis direction, which is the longitudinal direction of the wavelength conversion member 50, a third surface 50c and a fourth surface 50d that intersect with the first surface 50a and the second surface 50b, respectively, and are located opposite each other, and a fifth surface 50e and a sixth surface 50f that intersect with the first surface 50a and the second surface 50b, respectively, and intersect with the third surface 50c and the fourth surface 50d, respectively, and are located opposite each other. The light emitting element 72 is provided so that the light emitting surface 72a faces the third surface 50c of the wavelength converting member 50. The wavelength converting member 50 emits fluorescence Y from the first surface 50a. The support groove 154 of the support member 54 is composed of a support surface 154s that supports the fourth surface 50d of the wavelength conversion member 50, a first wall surface 154a of the first side wall 141 that intersects the support surface 154s and faces the fifth surface 50e of the wavelength conversion member 50, and a second wall surface 154b of the second side wall 142 that intersects the support surface 154s and faces the sixth surface 50f of the wavelength conversion member 50. The light source unit 70 is disposed relative to the support member 54 so that the substrate 71 faces the first top surface 55a of the first side wall 141 and the second top surface 57a of the second side wall 142. When an imaginary plane KM connecting the first top surface 55a and the second top surface 57a is set, the light emitting surface 72a of the light emitting element 72 is located on the third surface 50c side of the wavelength converting member 50 with respect to the imaginary plane KM.

[0095] According to the light source device 100 of this embodiment, leakage of the excitation light E emitted from each light emitting element 72 of the light source section 70 from the gap between the substrate 71 and the support member 54 is suppressed, and the excitation light E can be efficiently incident on the wavelength conversion member 50. Therefore, the light utilization efficiency of the excitation light E emitted from the light source section 70 can be improved.

[0096] The projector 1 of this embodiment includes a compact light source device 100 that efficiently extracts bright fluorescent light Y from the wavelength conversion member 50, and therefore can provide a compact projector with excellent light utilization efficiency.

[0097] 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.

[0098] (First Modification) In the above embodiment, the surface 71a of the substrate 71 abuts against the first top surface 55a and the second top surface 57a, but the present invention is not limited to this. This modification differs from the above embodiment in that the surface 71a of the substrate 71 is spaced apart from the first top surface 55a and the second top surface 57a.

[0099] FIG. 6 is a cross-sectional view of a light source device 200 according to this modification. 6, in the light source device 200 of this modification, the surface 71a of the substrate 71 is spaced apart from the first top surface 55a and the second top surface 57a. The light emitting surface 72a of each light emitting element 72 is located on the third surface 50c side of the wavelength converting member 50 with respect to the imaginary plane KM.

[0100] According to the configuration of this modified example, gaps can be provided between the surface 71a of the substrate 71 and the first top surface 55a and second top surface 57a. Heat generated in the wavelength conversion member 50 heats the air in the support groove 154. The heated air in the support groove 154 is discharged to the outside of the support groove 154 through the gaps, thereby suppressing a temperature rise in the wavelength conversion member 50. Furthermore, because high-temperature air is less likely to remain in the support groove 154, damage to the light-emitting surfaces 72a of the light-emitting elements 72 facing the wavelength conversion member 50 due to exposure to high-temperature air can be suppressed.

[0101] Whether to adopt the configuration of the first embodiment in which the substrate 71 is in contact with the first top surface 55a and the second top surface 57a, or the configuration of the first modified example in which the substrate 71 is spaced apart from the first top surface 55a and the second top surface 57a, can be selected appropriately depending on whether priority is given to the light utilization efficiency of the excitation light E or to the reduction in fluorescence conversion efficiency due to heat.

[0102] (Second Modification) In the above embodiment, the surface 71a of the substrate 71 abuts against the first top surface 55a and the second top surface 57a, but the present invention is not limited to this. This modification differs from the above embodiment in that the surface 71a of the substrate 71 abuts against the first top surface 55a and the second top surface 57a indirectly.

[0103] FIG. 7 is a cross-sectional view of a light source device 300 according to this modification. 7, in light source device 300 of this modification, substrate 71 abuts against first top surface 55a and second top surface 57a via insulating layer 301. Insulating layer 301 is made of ceramics such as aluminum nitride or alumina.

[0104] According to the light source device 300 of this modification, the provision of the insulating layer 301 made of ceramics makes it possible to more reliably prevent short circuits due to contact between the wiring, electrodes, etc. formed on the front surface 71a side of the substrate 71 and the support member 54. Furthermore, since the insulating layer 301 made of ceramics has high thermal conductivity, the substrate 71 and the support member 54 can be connected in a state that allows good heat transfer.

[0105] In this modification, a case where ceramics is used as the insulating layer 301 has been exemplified, but a dielectric multilayer film may also be used. By using a dielectric multilayer film, the thickness of the insulating layer can be reduced, and therefore, by increasing the height of the first side wall 141 and the second side wall 142, leakage of the excitation light E can be effectively suppressed.

[0106] (Third Modification) In the light source section 70 of the above embodiment, the light emitting elements 72 are electrically connected to the substrate 71 via the metal wires 74, but the configuration of the light source section in the present invention is not limited to this.

[0107] FIG. 8 is a cross-sectional view of a light source device 400 according to this modification. 8, light source device 400 of this modification has a light source section 370. Light source section 370 has a substrate 371 and a plurality of light-emitting elements 372 mounted on substrate 371. Each light-emitting element 372 has a light-emitting surface 372a that emits light, and an electrode section 373 that is provided on a back surface 372b opposite to light-emitting surface 372a and facing substrate 371, and that is electrically connected to substrate 371.

[0108] The light source unit 370 of this modified example does not use a wire bonding method using metal wires 74, but uses a flip-chip bonding method in which the electrode portion 373 on the back surface 372b of each light-emitting element 372 is directly connected to a terminal portion (not shown) of the substrate 371.

[0109] According to the light source device 400 of this modification, there is no interference between the metal wire 74 and the support member 54, and therefore there is no need to provide a notch in each wall surface of the first side wall 141 and the second side wall 142. Therefore, the excitation light E emitted from each light emitting element 372 is reflected by the inner wall surfaces of each side wall 141, 142 and efficiently enters the wavelength conversion member 50 without entering the notch.

[0110] Furthermore, because there is no contact between the metal wire 74 and the support member 54, the light-emitting surface 372a of each light-emitting element 372 can be arranged closer to the wavelength conversion member 50. By bringing the light-emitting surface 372a of each light-emitting element 372 closer to the wavelength conversion member 50, the excitation light E emitted from the light-emitting surface 372a can be efficiently incident on the wavelength conversion member 50. Therefore, it is possible to realize a light source device 400 that generates bright fluorescence Y while having a compact device configuration.

[0111] (Fourth Modification) In the light source section 70 of the above embodiment, the metal wires 74 are drawn out from both sides of each light emitting element 72, but the configuration of the light source section in the present invention is not limited to this.

[0112] FIG. 9 is a cross-sectional view of a light source device 500 according to this modification. 9, light source device 500 of this modification has a light source section 470. Light source section 470 has a substrate 471 and a plurality of light emitting elements 472 mounted on substrate 471. Each light emitting element 472 has a light emitting surface 472a, one anode electrode 472b, and one cathode electrode 472c. In this modification, each light emitting element 472 has a configuration different from each light emitting element 72 of the above embodiment in that each light emitting element 472 has one anode electrode 472b on one side of light emitting surface 472a.

[0113] The anode electrode 472b of each light-emitting element 427 of this modified example has a strip shape extending along the X-axis direction of the light-emitting surface 472a. According to each light-emitting element 427 of this modified example, a plurality of metal wires 74 (three in FIG. 9 ) can be used to electrically connect the anode electrode 472b and the terminal portion 73 of the substrate 471. In this modified example, the metal wires 74 are provided on the first side wall 141 side of the light-emitting element 472, but are not provided on the second side wall 142 side of the light-emitting element 472.

[0114] According to the light source unit 470 of this modification, current can be supplied to the light-emitting surface 472a of each light-emitting element 472 via the three metal wires 74, so that the current density supplied to the light-emitting surface 472a is stable and excitation light E can be uniformly emitted from the light-emitting surface 472a. Therefore, each light-emitting element 472 can emit uniform and bright excitation light E from the light-emitting surface 472a.

[0115] According to the light source device 500 of this modification, there is no interference between the metal wire 74 and the second side wall 142, so it is sufficient to provide only the first notch 56 in the first side wall 141, and there is no need to provide a notch on the second side wall 142 side. Therefore, compared to the case where notches are provided in the side walls on both sides, the excitation light E emitted from each light-emitting element 472 can be made to enter the wavelength conversion member 50 more efficiently.

[0116] (Fifth Modification) In the above-mentioned fourth modified example, an example was given in which the second wall surface 154b of the second side wall 142, which does not have a cutout portion, has a third portion 54b3 that is perpendicular to the support surface 154s and an inclined fourth portion 54b4, but the shape of the support groove of the support member may be changed depending on the structure of the light source unit.

[0117] FIG. 10 is a cross-sectional view of a light source device 600 according to this modification. 10 , the support member 54 of the light source device 600 of this modified example includes a bottom wall 140, a first side wall 141, and a second side wall 242. The second side wall 242 has a second wall surface 254b that forms the other side surface of the support groove 254. The second wall surface 254b extends perpendicularly from the support surface 154s and abuts against the sixth surface 50f of the wavelength conversion member 50.

[0118] According to light source device 600 of this modification, wavelength conversion member 50 abuts on sixth surface 50f in addition to support surface 154s, and therefore the contact area between wavelength conversion member 50 and support groove 154 can be increased compared to the configurations of the above embodiment and modification. Therefore, heat can be efficiently released from wavelength conversion member 50 to support member 54, thereby improving the cooling performance of wavelength conversion member 50.

[0119] Furthermore, in the above embodiment, a CPC is used as the angle conversion member, but instead of a CPC, a tapered rod in the shape of a truncated square pyramid, the area of ​​the exit end face of which is larger than the area of ​​the entrance end face, may be used.

[0120] In addition, in the above embodiment, an example was given in which the present invention was 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, for example, 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.

[0121] In addition, the specific descriptions of the shape, number, arrangement, materials, etc. of each component of the light source device and the projector are not limited to the above-described embodiments and can be modified as appropriate. Furthermore, in the above-described embodiments, an example was shown in which the light source device according to the present invention was mounted in a projector using a liquid crystal panel, but this is not limiting. The light source device according to the present invention may also be applied to a projector using a digital micromirror device as a light modulation device. Furthermore, the projector does not need to have multiple light modulation devices, and may have only one light modulation device.

[0122] 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.

[0123] Summary of this disclosure A summary of this disclosure is provided below.

[0124] (Appendix 1) a light source unit including a light emitting element that emits light from a light emitting surface and a substrate that supports the light emitting element; a light guide member into which the light emitted from the light emitting element is incident; a support member having a support groove for supporting the light guide member, The light guide member is the light-guiding member has a first surface and a second surface located opposite to each other in a longitudinal direction of the light-guiding member, a third surface and a fourth surface that intersect with the first surface and the second surface, respectively, and are located opposite to each other, and a fifth surface and a sixth surface that intersect with the first surface and the second surface, respectively, and also intersect with the third surface and the fourth surface, respectively, and are located opposite to each other, the light-emitting element is provided so that the light-emitting surface faces the third surface of the light-guiding member, the light guide member emits light from the first surface, The support groove of the support member is a support surface that supports the fourth surface of the light guide member; a first wall surface of a first side wall that intersects with the support surface and faces the fifth surface of the light guiding member; a second wall surface of a second side wall that intersects with the support surface and faces the sixth surface of the light guiding member, the light source unit is disposed with respect to the support member such that the substrate faces a first top surface of the first side wall and a second top surface of the second side wall; When a virtual plane connecting the first top surface and the second top surface is set, the light emitting surface of the light emitting element is located on the third surface side of the light guiding member with respect to the imaginary plane; Light source device.

[0125] According to the light source device having this configuration, leakage of light emitted from the light-emitting elements of the light source unit through the gap between the substrate and the support member is suppressed, and the light can be efficiently incident on the light-guiding member, thereby improving the utilization efficiency of the light emitted from the light source unit.

[0126] (Appendix 2) the substrate of the light source unit abuts against the first top surface and the second top surface; 2. The light source device according to claim 1.

[0127] With this configuration, the support groove can be closed in the depth direction by the substrate, which prevents light from leaking through gaps between the first and second side walls and the substrate, thereby further improving light utilization efficiency.

[0128] (Appendix 3) the substrate of the light source unit is spaced apart from the first top surface and the second top surface; 3. The light source device according to claim 1.

[0129] According to this configuration, gaps can be provided between the substrate and the first and second top surfaces. This allows heated air in the support groove to be discharged to the outside of the support groove through the gaps, thereby suppressing a temperature rise in the light-guiding member. Furthermore, since high-temperature air is less likely to remain in the support groove, damage to the light-emitting surfaces 72a of the light-emitting elements 72 facing the wavelength conversion member 50 due to exposure to high-temperature air can be suppressed.

[0130] (Appendix 4) an apex of at least one of the first side wall and the second side wall has a notch provided at a corner on the support groove side; 4. The light source device according to claim 1.

[0131] According to this configuration, the cutout portion ensures a space between the light emitting element and the side wall, thereby preventing contact between the light emitting element and the side wall of the support member.

[0132] (Appendix 5) the light source unit further includes a metal wire that electrically connects the light emitting element and the substrate, The metal wire is disposed in the notch. 5. The light source device according to claim 4.

[0133] This configuration allows for simple and accurate electrical continuity between the substrate and the light-emitting element via the metal wire. Furthermore, since the metal wire is housed in the notch, contact between the metal wire and the support member can be prevented.

[0134] (Appendix 6) the light-emitting element has an electrode portion provided on a surface facing the substrate and electrically connected to the substrate; 3. The light source device according to claim 1.

[0135] This configuration allows for the use of flip-chip bonding, which directly connects the electrodes of each light-emitting element to the substrate. This eliminates the need for metal wires, eliminating interference between the metal wires and the support member, and eliminating the need to make the support grooves unnecessarily large. This allows light emitted from the light-emitting element to be efficiently incident on the light-guiding member.

[0136] (Appendix 7) the first wall surface has a first portion located on the third surface side and a second portion located on the support surface side, the first portion extending in a direction perpendicular to the support surface, and the second portion inclining so as to approach the fifth surface from the first portion side toward the support surface side, the second wall surface has a third portion located on the third surface side and a fourth portion located on the support surface side, the third portion extending in a direction perpendicular to the support surface, and the fourth portion inclining from the third portion side toward the support surface side so as to approach the sixth surface. 7. The light source device according to claim 1.

[0137] According to this configuration, a portion of the light emitted from the light-emitting element travels through the gap between the third surface and the first portion of the light-guiding member, and then enters the second portion inclined with respect to the support surface. At this time, the light is reflected by the second portion and enters the third surface of the light-guiding member. In this way, light passing through the gap between the third surface of the light-guiding member and the first wall surface is more likely to enter the third surface, thereby reducing the amount of light reflected by the support surface and returning to the light-emitting element. In addition, a portion of the light is reflected by the first portion extending perpendicular to the support surface and enters the third surface of the light-guiding member. Similarly, a portion of the light emitted from the light-emitting element travels through the gap between the fourth surface and the third portion of the light-guiding member and then enters the fourth portion, which is inclined with respect to the support surface. At this time, the light is reflected at the fourth portion and enters the fourth surface of the light-guiding member. In this way, light passing through the gap between the fourth surface of the light-guiding member and the second wall surface is more likely to enter the fourth surface, thereby reducing the amount of light reflected at the support surface and returning to the light-emitting element. In addition, a portion of the light is reflected at the third portion, which extends perpendicular to the support surface, and enters the fourth surface of the light-guiding member. Therefore, a light source device can be realized that has high light utilization efficiency and makes it easy to obtain light with a desired intensity.

[0138] (Appendix 8) the metal wire is provided on the first sidewall side of the light-emitting element, and is not provided on the second sidewall side of the light-emitting element, the second wall surface of the second side wall extends perpendicularly from the support surface and abuts against the sixth surface of the light guiding member; 6. The light source device according to claim 5.

[0139] This configuration increases the contact area between the wavelength conversion member and the support groove, thereby efficiently dissipating heat from the light guide member to the support member, thereby improving the cooling performance of the light guide member.

[0140] (Appendix 9) the substrate abuts against the first top surface and the second top surface via an insulating layer made of ceramic; 3. The light source device according to claim 2.

[0141] This configuration provides a ceramic insulating layer that can more reliably prevent short circuits caused by contact between the substrate and the support member. In addition, the ceramic insulating layer has high thermal conductivity, allowing the substrate and the support member to be connected in a state that allows good heat transfer.

[0142] (Appendix 10) the light-emitting element emits first light having a first wavelength band; the light guide member is a wavelength conversion member that includes a phosphor, converts the first light emitted from the light emitting element into second light having a second wavelength band different from the first wavelength band, and emits the second light. 10. The light source device according to claim 1.

[0143] According to this configuration, it is possible to realize a light source device capable of emitting second light obtained by wavelength conversion of first light.

[0144] (Appendix 11) A light source device according to any one of Supplementary Note 1 to Supplementary Note 10; a light modulation device that modulates the light emitted from the light source device in accordance with image information; a projection optical device that projects the light modulated by the light modulation device, projector.

[0145] A projector with this configuration can be realized that is capable of projecting images with excellent display quality. [Explanation of symbols]

[0146] 1...Projector, 4B, 4G, 4R...Light modulation device, 6...Projection optical device, 50...Wavelength conversion member (light guide member), 50a...First surface, 50b...Second surface, 50c...Third surface, 50d...Fourth surface, 50e...Fifth surface, 50f...Sixth surface, 70, 370, 470...Light source unit, 54...Support member, 55a...First top surface, 56...First notch portion (notch portion), 57a...Second top surface, 58...Second notch portion (notch portion), 71, 371, 471...Substrate, 72, 372, 427, 472...Light emitting element , 72a, 372a, 472a...light-emitting surface, 74...metal wire, 100, 200, 300, 400, 500, 600...light source device, 141...first side wall, 142, 242...second side wall, 154...support groove, 154a...first wall surface, 154b, 254b...second wall surface, 154s...support surface, 301...insulating layer, 373...electrode portion, 54a1...first portion, 54a2...second portion, 54b3...third portion, 54b4...fourth portion, KM...virtual plane, E...excitation light (first light), Y...fluorescence (second light).

Claims

1. a light source unit including a light emitting element that emits light from a light emitting surface and a substrate that supports the light emitting element; a light guide member into which the light emitted from the light emitting element is incident; a support member having a support groove for supporting the light guide member, The light guide member is the light-guiding member has a first surface and a second surface located opposite to each other in a longitudinal direction of the light-guiding member, a third surface and a fourth surface that intersect with the first surface and the second surface, respectively, and are located opposite to each other, and a fifth surface and a sixth surface that intersect with the first surface and the second surface, respectively, and also intersect with the third surface and the fourth surface, respectively, and are located opposite to each other, the light-emitting element is provided such that the light-emitting surface faces the third surface of the light-guiding member, the light guide member emits light from the first surface, The support groove of the support member is a support surface that supports the fourth surface of the light guide member; a first wall surface of a first side wall that intersects with the support surface and faces the fifth surface of the light guiding member; a second wall surface of a second side wall that intersects with the support surface and faces the sixth surface of the light guiding member, the light source unit is disposed with respect to the support member such that the substrate faces a first top surface of the first side wall and a second top surface of the second side wall; When a virtual plane connecting the first top surface and the second top surface is set, the light emitting surface of the light emitting element is located on the third surface side of the light guiding member with respect to the imaginary plane; Light source device.

2. the substrate of the light source unit abuts against the first top surface and the second top surface; The light source device according to claim 1 .

3. the substrate of the light source unit is spaced apart from the first top surface and the second top surface; The light source device according to claim 1 .

4. an apex of at least one of the first side wall and the second side wall has a notch provided at a corner on the support groove side; 3. The light source device according to claim 1.

5. the light source unit further includes a metal wire that electrically connects the light emitting element and the substrate, The metal wire is disposed in the notch. The light source device according to claim 4 .

6. the light-emitting element has an electrode portion provided on a surface facing the substrate and electrically connected to the substrate; 3. The light source device according to claim 1.

7. the first wall surface has a first portion located on the third surface side and a second portion located on the support surface side, the first portion extending in a direction perpendicular to the support surface, and the second portion inclining so as to approach the fifth surface from the first portion side toward the support surface side, the second wall surface has a third portion located on the third surface side and a fourth portion located on the support surface side, the third portion extending in a direction perpendicular to the support surface, and the fourth portion inclining from the third portion side toward the support surface side so as to approach the sixth surface; 3. The light source device according to claim 1.

8. the metal wire is provided on the first sidewall side of the light-emitting element, and is not provided on the second sidewall side of the light-emitting element, the second wall surface of the second side wall extends perpendicularly from the support surface and abuts against the sixth surface of the light guiding member; The light source device according to claim 5 .

9. the substrate abuts against the first top surface and the second top surface via an insulating layer made of ceramic; The light source device according to claim 2 .

10. the light-emitting element emits first light having a first wavelength band; the light guide member is a wavelength conversion member that includes a phosphor, converts the first light emitted from the light emitting element into second light having a second wavelength band different from the first wavelength band, and emits the second light.

3. The light source device according to claim 1.

11. The light source device according to claim 1 or 2; a light modulation device that modulates the light emitted from the light source device in accordance with image information; a projection optical device that projects the light modulated by the light modulation device, projector.

Images