Light source device and projector

Abstract

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

Description

[Technical field]

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

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

[0003] The following Patent Document 1 discloses a light source device including an excitation light source having a light emitting element and a support substrate, a phosphor rod that converts the excitation light emitted from the light emitting element into fluorescence, and a support that dissipates heat generated by the phosphor rod. In this light source device, the phosphor rod is held in a holding groove of the support. [Prior art documents] [Patent documents]

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

[0005] In the light source device of Patent Document 1, the support body functions as a heat dissipation member that suppresses the temperature rise of the phosphor rod, so it is desirable to appropriately position the phosphor rod in the holding groove. However, in the light source device of Patent Document 1, the bottom surface of the holding groove is surrounded by side walls, which causes variation in the area of ​​the bottom surface, preventing good adhesion between the phosphor rod and the bottom surface, and making it impossible to efficiently dissipate heat from the phosphor rod. [Means for solving the problem]

[0006] In order to solve the above problems, a light source device of one embodiment of the present invention comprises a light-emitting element that emits light, a light-guiding member having a first surface into which the light emitted from the light-emitting element is incident, a second surface facing opposite to the first surface, third and fourth surfaces that intersect the first and second surfaces and face opposite to each other, and a light-emitting portion that emits the light, a support portion including a support surface that forms a bottom surface of a holding groove that holds the light-guiding member and supports the second surface of the light-guiding member, a first side wall portion arranged opposite to the third surface of the light-guiding member and including a first wall surface that forms one inner surface of the holding groove, and a second side wall portion arranged opposite to the fourth surface of the light-guiding member and including a second wall surface that forms the other inner surface of the holding groove, and at least one of the first side wall portion and the second side wall portion is formed of a material separate from the support portion.

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

[0008] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a projector according to an embodiment. [Diagram 2] FIG. 2 is a schematic diagram illustrating the configuration of a first lighting device. [Diagram 3] 4 is a plan view of the light source device as viewed from the Y-axis direction. FIG. [Figure 4] 4 is a cross-sectional view of the light source device taken along line IV-IV in FIG. [Figure 5A] 4A to 4C are explanatory diagrams of a deposition state of a reflective film in the present embodiment. [Figure 5B] FIG. 13 is an explanatory diagram of a deposition state of a reflective film in a comparative example. [Figure 6] FIG. 11 is a cross-sectional view showing the configuration of a support member of a first modified example. [Figure 7] FIG. 11 is a cross-sectional view showing the configuration of a support member of a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0028] The light source device 100 includes a wavelength conversion member 50, a light source unit 51, 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 the present embodiment corresponds to the "light guiding member" in the claims.

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

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

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

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

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

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

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

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

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

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

[0039] The light source unit 51 has a substrate 55 and a plurality of light emitting elements 56. The light source unit 51 may also include other optical members such as a light guide plate, a diffusion plate, a lens, etc. The substrate 55 of the light source unit 51 is fixed to a support member 54 in a region not shown. The plurality of light emitting elements 56 are provided on one surface 55a of the substrate 55. The number of light emitting elements 56 in the light source unit 51 of the present embodiment is not particularly limited.

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

[0041] The support member 54 has a base member 60 and a holding groove 59 that holds the wavelength conversion member 50. The support member 54 supports the wavelength conversion member 50 inside the holding groove 59 and functions as a heat dissipation member that diffuses and releases heat generated by the wavelength conversion member 50 to the outside. For this reason, the support member 54 has a predetermined strength and is made of a material with high thermal conductivity. As a material for the support member 54, for example, a metal such as aluminum or stainless steel is used, and in particular, it is desirable to use an aluminum alloy such as 6061 series. The specific configuration of the support member 54 will be described later.

[0042] The position regulating portion 65, together with the pair of pressing members 90, regulates the position of the wavelength conversion member 50 relative to the support member 54. The position regulating portion 65 regulates movement of the wavelength conversion member 50 in the +Z direction and the -Z direction along the Z axis.

[0043] The pair of pressing members 90 regulate the position of the wavelength conversion member 50 in the Y-axis direction relative to the support member 54 inside the holding groove 59. The pair of pressing members 90 are disposed facing the support surface 54s of the holding groove 59. In this way, the pressing members 90 regulate the wavelength conversion member 50 from moving in the Y-axis direction inside the holding groove 59. The pressing members 90 are made of an elastically deformable material. As an example, the pressing members 90 are made of a leaf spring made of a metal material, for example, a stainless steel material such as SUS304.

[0044] The pair of pressing members 90 are disposed at positions not overlapping with the light emitting element 56 of the light source unit 51, and press the wavelength conversion member 50 against the support surface 54s of the holding groove 59 of the support member 54. The pair of pressing members 90 are fixed to the support member 54.

[0045] The mirror 53 is provided on the sixth surface 50f of the wavelength conversion member 50. The mirror 53 guides light inside the wavelength conversion member 50 and reflects the fluorescence Y that reaches the sixth surface 50f. The mirror 53 is made of a metal film or a dielectric multilayer film formed on the sixth surface 50f of the wavelength conversion member 50.

[0046] In the first lighting device 20, when the excitation light E emitted from the light source unit 51 is incident on the wavelength conversion member 50, the phosphor contained in the wavelength conversion member 50 is excited, and the fluorescence Y is emitted from an arbitrary light-emitting point. The fluorescence Y travels in all directions from an arbitrary light-emitting point, but the fluorescence Y traveling toward the four side surfaces 50a, 50b, 50c, and 50d travels toward the fifth surface 50e or the sixth surface 50f while repeating total reflection at multiple points on the side surfaces 50a, 50b, 50c, and 50d. The fifth surface 50e emits the fluorescence Y that has been guided inside the wavelength conversion member 50 by being propagated by total reflection. In the case of this embodiment, the fluorescence Y traveling toward the fifth surface 50e is incident on the angle conversion member 52 provided on the fifth surface 50e. The fluorescence Y traveling toward the sixth surface 50f is reflected by the mirror 53 and travels toward the fifth surface 50e.

[0047] Of the excitation light E incident on the wavelength conversion member 50, a portion of the excitation light E that is not used to excite the phosphor is reflected by the members surrounding the wavelength conversion member 50, including the light emitting element 56 of the light source unit 51, or by the mirror 53 provided on the second surface 50b. Therefore, a portion of the excitation light E is trapped inside the wavelength conversion member 50 and reused.

[0048] Angle conversion member 52 is provided on fifth surface 50e of wavelength conversion member 50. Angle conversion member 52 is composed of, for example, a tapered rod. Angle conversion member 52 has a light incident surface 52a on which fluorescence Y emitted from wavelength conversion member 50 is incident, a light exit surface 52b from which fluorescence Y exits, and a side surface 52c that reflects the incident fluorescence Y toward light exit surface 52b.

[0049] 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.

[0050] The fluorescence Y incident on the angle conversion member 52 changes direction each time it is totally reflected by the side surface 52c while traveling inside the angle conversion member 52 so as to approach a direction parallel to the optical axis J. In this way, the angle conversion member 52 converts the emission angle distribution of the fluorescence Y emitted from the fifth surface 50e of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum emission angle of the fluorescence Y on the light emission surface 52b smaller than the maximum incidence angle of the fluorescence Y on the light incidence surface 52a.

[0051] 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.

[0052] The angle conversion member 52 is fixed to the wavelength conversion member 50 via an optical adhesive (not shown) so that the light incident surface 52a faces the fifth surface 50e of the wavelength conversion member 50. That is, the angle conversion member 52 and the wavelength conversion member 50 are in contact with each other via an optical adhesive, and no gap, such as an air layer, is provided between the angle conversion member 52 and the wavelength conversion member 50. If a gap is provided between the angle conversion member 52 and the wavelength conversion member 50, the fluorescence Y that reaches the light incident surface 52a of the angle conversion member 52 and is incident on the light incident surface 52a at an angle equal to or greater than the critical angle is totally reflected by the light incident surface 52a and cannot be incident on the angle conversion member 52. In contrast, if no gap is provided between the angle conversion member 52 and the wavelength conversion member 50 as in this embodiment, the loss component of the fluorescence Y that cannot be incident on the angle conversion member 52 due to total reflection can be reduced. From this viewpoint, it is desirable to match the refractive index of the angle conversion member 52 and the refractive index of the wavelength conversion member 50 as much as possible.

[0053] 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.

[0054] A collimating optical system 73 consisting of a collimator lens or the like is provided between the light source device 100 and the integrator optical system 70. The collimating optical system 73 further narrows the angular distribution of the fluorescence Y emitted from the angle conversion member 52, and causes the highly parallel fluorescence Y to be incident on the integrator optical system 70. Note that the collimating optical system 73 does not need to be provided when the parallelism of the fluorescence Y emitted from the angle conversion member 52 is sufficiently high.

[0055] The integrator optical system 70 has a first lens array 71 and a second lens array 72. The integrator optical system 70, together with the superimposing optical system 103, functions as a uniform illumination optical system that uniformizes the intensity distribution of the fluorescence Y emitted from the light source device 100 in each of the light modulation devices 4R and 4G, which are the illuminated regions. The fluorescence Y emitted from the collimating optical system 73 is incident on the first lens array 71. The first lens array 71, together with the second lens array 72 provided downstream of the light source device 100, constitutes the integrator optical system 70.

[0056] The first lens array 71 has a plurality of first small lenses 71a. The plurality of first small lenses 71a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20. The plurality of first small lenses 71a split the fluorescence Y emitted from the angle conversion member 52 into a plurality of partial light beams. The shape of each of the first small lenses 71a is a rectangle that is approximately similar to the shape of the image forming areas of the light modulation devices 4R and 4G. As a result, each of the partial light beams emitted from the first lens array 71 is efficiently incident on the image forming areas of the light modulation devices 4R and 4G.

[0057] The fluorescence Y emitted from the first lens array 71 travels toward the second lens array 72. The second lens array 72 is disposed opposite to the first lens array 71. The second lens array 72 has a plurality of second small lenses 72a corresponding to the plurality of first small lenses 71a of the first lens array 71. The second lens array 72, together with the superimposing optical system 103, forms each of the images of the plurality of first small lenses 71a of the first lens array 71 in the vicinity of the image forming areas of the light modulation devices 4R, 4G. The plurality of second small lenses 72a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20.

[0058] In this embodiment, the first small lenses 71a of the first lens array 71 and the second small lenses 72a of the second lens array 72 have the same size, but may have different sizes. Also, in this embodiment, the first small lenses 71a of the first lens array 71 and the second small lenses 72a of the second lens array 72 are arranged at positions where their optical axes coincide with each other, but may be arranged in an eccentric state with respect to each other.

[0059] The polarization conversion element 102 converts the polarization direction of the fluorescence Y emitted from the second lens array 72. Specifically, the polarization conversion element 102 converts each partial light beam of the fluorescence Y split by the first lens array 71 and emitted from the second lens array 72 into linearly polarized light.

[0060] The polarization conversion element 102 has a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the fluorescence Y emitted from the light source device 100 as is and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1, a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1, and a phase difference plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

[0061] Fig. 3 is a plan view of the light source device 100 as viewed from the Y-axis direction. Fig. 4 is a cross-sectional view of the light source device 100 taken along line IV-IV in Fig. 3. As shown in FIG. 3, the base member 60 of the support member 54 has a spring fixing portion 540, a first accommodating portion 541, a second accommodating portion 542, a third accommodating portion 543, a fourth accommodating portion 544, a fifth accommodating portion 545, a sixth accommodating portion 546, a first wall accommodating portion 547, and a second wall accommodating portion 548.

[0062] The holding groove 59 extends in the X-axis direction along the longitudinal direction of the wavelength conversion member 50 and accommodates a part of the wavelength conversion member 50 therein. The wavelength conversion member 50 includes a first protrusion 151 that protrudes from the holding groove 59 in the +X direction, and a second protrusion 152 that protrudes from the holding groove 59 in the -X direction. The first protrusion 151 includes the ends of the first surface 50a, the second surface 50b, the third surface 50c, the fourth surface 50d, and the fifth surface 50e on the +X direction side. The second protrusion 152 includes the ends of the first surface 50a, the second surface 50b, the third surface 50c, the fourth surface 50d, and the sixth surface 50f on the -X direction side. In other words, both ends of the wavelength conversion member 50 protrude outside the holding groove 59 of the support member 54 .

[0063] The spring fixing portions 540 are disposed on both sides of the holding groove 59 in the Z-axis direction along the short side of the wavelength conversion member 50. The spring fixing portions 540 fix, with screws 96, both ends of the pressing member 90 disposed across the wavelength conversion member 50 in the Z-axis direction.

[0064] The first accommodating portion 541 is a recess communicating with the holding groove 59 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 holding groove 59. The first accommodating portion 541 also holds the angle conversion member 52 fixed to the fifth surface 50e of the wavelength conversion member 50. In this embodiment, the angle conversion member 52 fixed to the fifth surface 50e of the first protruding portion 151 is held by the 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.

[0065] The second accommodating portion 542 is a recess that communicates with the holding groove 59 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 a part of the second protruding portion 152 of the wavelength conversion member 50 that protrudes from the holding groove 59. In this embodiment, the mirror 53 is provided on the sixth surface 50f of the second protruding portion 152. The second accommodating portion 542 accommodates the mirror 53 provided on the sixth surface 50f of the wavelength conversion member 50.

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

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

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

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

[0070] The first wall accommodating portion 547 is a recessed portion that holds a first side wall portion 61 of the support member 54, which will be described later. The second wall accommodating portion 548 is a recessed portion that holds a second side wall portion 62 of the support member 54, which will be described later.

[0071] The position regulating portion 65 holds the first protruding portion 151 or the second protruding portion 152 protruding from the holding groove 59 of the support member 54, and regulates the position of the first protruding portion 151 or the second protruding portion 152 with respect to the holding groove 59. The position regulating portion 65 includes a pair of regulating members 651, 652 that hold the first protruding portion 151, and a pair of regulating members 653, 654 that hold the second protruding portion 152.

[0072] One of the restriction members 651 which holds the first protrusion 151 is fixed to the third housing portion 543 via a screw 97, and the other restriction member 652 is fixed to the fourth housing portion 544 via a screw 97. One of the restriction members 653 which holds the second protrusion 152 is fixed to the fifth housing portion 545 via a screw 97, and the other restriction member 654 is fixed to the sixth housing portion 546 via a screw 97.

[0073] The pair of regulating members 651, 652 can adjust their respective positions in the Z axis direction by an adjustment mechanism (not shown). Similarly, the pair of regulating members 653, 654 can adjust their respective positions in the Z axis direction by an adjustment mechanism (not shown).

[0074] In this manner, the wavelength conversion member 50 of this embodiment is held within the holding groove 59 with the movement in the Z-axis direction of the first protrusion 151 and the second protrusion 152 protruding outside the holding groove 59 being restricted by the position restricting portion 65.

[0075] As shown in FIG. 4, the holding groove 59 of the support member 54 has a U-shaped cross section perpendicular to the X-axis direction. The inventors considered that when a holding groove having a U-shaped cross-sectional shape is formed into an integral part by cutting, it is difficult to ensure the surface precision of the supporting surface of the holding groove, and therefore good adhesion cannot be achieved between the wavelength conversion member and the supporting surface of the holding groove, resulting in a problem of reduced heat dissipation of the wavelength conversion member. The inventors of the present invention have found that the above-mentioned problems can be solved by forming a holding groove having a U-shaped cross section by combining multiple parts, and that the surface precision of the supporting surface can be ensured by improving the workability of the holding groove. Thus, the configuration of the light source device 100 of this embodiment has been completed.

[0076] The following describes features of the light source device 100 of this embodiment that solves the above problems. In the light source device 100 of this embodiment, the holding groove 59 is configured by combining a support portion 63, a first side wall portion 61, and a second side wall portion 62, as described below.

[0077] The support portion 63 includes a support surface 54s that supports the second surface 50b of the wavelength conversion member 50, and a first side surface 63a and a second side surface 63b that intersect with the support surface 54s. The supporting surface 54s is a surface that extends parallel to the XZ plane and constitutes the bottom surface of the holding groove 59 that holds the wavelength conversion member 50. The supporting surface 54s supports the second surface 50b of the wavelength conversion member 50. The first side surface 63a and the second side surface 63b are flat surfaces that extend along the XY plane and face in opposite directions to each other. In this embodiment, the support portion 63 is formed as an integral member with the base member 60. That is, the support portion 63 is formed of the same metal as the base member 60, such as aluminum or stainless steel, which has excellent heat dissipation properties. The support portion 63 is a component separate from the first side wall portion 61 and the second side wall portion 62. Since the support portion 63 is highly workable, the support surface 54s can be formed with high surface accuracy.

[0078] The first side wall portion 61 is formed of a separate member from the base member 60. That is, the first side wall portion 61 is formed of a separate member from the support portion 63. The first side wall portion 61 is formed of a metal such as aluminum or stainless steel. The first side wall portion 61 is disposed facing the third surface 50c of the wavelength conversion member 50 and includes a first wall surface 61a that constitutes an inner surface on the +Z side, which is one side of the Z-axis direction, of the holding groove 59. The first wall surface 61a of the first side wall portion 61 is spaced from the third surface 50c. That is, a gap is provided between the first wall surface 61a and the third surface 50c of the wavelength conversion member 50. In this embodiment, the first side wall portion 61 is a separate component from the second side wall portion 62 and the base member 60. Since the first side wall portion 61 is highly workable, the first wall surface 61a can be formed with high surface accuracy.

[0079] The first sidewall portion 61 is continuous with the first wall surface 61a and further includes an abutment surface 61b that abuts against a first side surface 63a of the support portion 63. The first side surface 63a of the support portion 63 and the abutment surface 61b of the first sidewall portion 61 have the same height in the Y-axis direction. Therefore, the support portion 63 and the first sidewall portion 61 are butted together so that the first side surface 63a and the abutment surface 61b abut against each other, whereby the support surface 54s of the support portion 63 and the first wall surface 61a of the first sidewall portion 61 are smoothly connected. By butting the first sidewall portion 61 and the support portion 63 against each other in the Z-axis direction, it becomes easy to position the first sidewall portion 61 and the support portion 63 in the Z-axis direction.

[0080] The first side wall portion 61 is held in a first wall accommodating portion 547 of the base member 60. The first side wall portion 61 is a recess provided along the X-axis direction along the longitudinal direction of the wavelength conversion member 50 on the +Z side of the support portion 63. The first side wall portion 61 is guided by the first wall accommodating portion 547, which makes it easy to align the first side wall portion 61 with the support portion 63. The first wall accommodating portion 547 is held by fixing two points in the center of the first side wall portion 61 in the X-axis direction with screws 98. It should be noted that the number of screws 98 for fixing the first side wall portion 61 is not limited to this. The first wall accommodation portion 547 in this embodiment corresponds to the "recess" in the claims.

[0081] The second side wall portion 62 is formed of a separate member from the base member 60. In other words, the second side wall portion 62 is formed of a separate member from the support portion 63. The second side wall portion 62 is made of a metal such as aluminum or stainless steel, which is the constituent material of the support member 54. The second side wall portion 62 is disposed opposite to the fourth surface 50d of the wavelength conversion member 50, and includes a second wall surface 62a that constitutes an inner surface on the -Z side, which is the other side in the Z-axis direction, of the holding groove 59. The second wall surface 62a of the second side wall portion 62 is spaced from the fourth surface 50d. That is, a gap is provided between the second wall surface 62a and the fourth surface 50d of the wavelength conversion member 50. In this embodiment, the second side wall portion 62 is a separate component from the first side wall portion 61 and the base member 60. Since the second side wall portion 62 is highly workable, the second wall surface 62a can be formed with high surface accuracy.

[0082] The second side wall portion 62 further includes an abutment surface 62b that abuts against the second side surface 63b of the support portion 63 and is connected to the second wall surface 62a. The second side surface 63b of the support portion 63 and the abutment surface 62b of the second side wall portion 62 have the same height in the Y-axis direction. Therefore, the support portion 63 and the second side wall portion 62 are butted against each other so that the second side surface 63b and the abutment surface 62b abut against each other, whereby the support surface 54s of the support portion 63 and the second wall surface 62a of the second side wall portion 62 are smoothly connected. By butting the second side wall portion 62 and the support portion 63 against each other in the Z-axis direction, it becomes easy to position the second side wall portion 62 and the support portion 63 in the Z-axis direction.

[0083] The second side wall portion 62 is held in a second wall accommodating portion 548 of the base member 60. The second wall accommodating portion 548 is a recess provided on the -Z side of the support portion 63 along the X-axis direction along the longitudinal direction of the wavelength conversion member 50. The second side wall portion 62 is guided by the second wall accommodating portion 548, which facilitates alignment with the support portion 63. The second wall accommodating portion 548 is held by fixing two points in the center of the second side wall portion 62 in the X-axis direction with screws 98. Note that the number of screws 98 for fixing the second side wall portion 62 is not limited to this. The second wall accommodation portion 548 in this embodiment corresponds to the "recess" in the claims.

[0084] In this manner, the holding groove 59 of the present embodiment is configured by fixing the first side wall portion 61, the second side wall portion 62, and the support portion 63 in a state where they are butted against each other in the Z-axis direction. In the case of the present embodiment, the first side wall portion 61 and the second side wall portion 62 can be easily aligned with the support portion 63 by simply guiding them to the first wall accommodating portion 547 and the second wall accommodating portion 548.

[0085] The first wall surface 61a has a first portion 61a1 located on the first surface 50a side and a second portion 61a2 located on the support surface 54s side. The first portion 61a1 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The second portion 61a2 is inclined so as to approach the third surface 50c from the first portion 61a1 side toward the support surface 54s side. In other words, the distance between the second portion 61a2 on the support surface 54s side and the third surface 50c is smaller than the distance between the second portion 61a2 on the first portion 61a1 side and the third surface 50c.

[0086] The second wall surface 62a has a third portion 62a1 located on the first surface 50a side and a fourth portion 62a2 located on the support surface 54s side. The third portion 62a1 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The fourth portion 62a2 is inclined so as to approach the fourth surface 50d from the third portion 62a1 side toward the support surface 54s side. In other words, the distance between the fourth portion 62a2 on the support surface 54s side and the fourth surface 50d is smaller than the distance between the fourth portion 62a2 on the third portion 62a1 side and the fourth surface 50d.

[0087] The first side wall 61 has a first reflective film 161 provided on the first wall surface 61a. The second side wall 62 has a second reflective film 162 provided on the second wall surface 62a. The first reflective film 161 and the second reflective film 162 are made of a metal film such as aluminum or stainless steel or a dielectric multilayer film formed by vapor deposition or sputtering. Instead of the first reflective film 161 and the second reflective film 162, a metal surface may be mirror-finished to impart light reflectivity to the first wall surface 61a or the second wall surface 62a. Moreover, on the support surface 54s constituting the bottom surface of the holding groove 59, a reflective film 163 similar to the first reflective film 161 and the second reflective film 162 is formed.

[0088] As described above, the light source device 100 of this embodiment has the holding groove 59 formed by combining three components, the support portion 63, the first side wall portion 61, and the second side wall portion 62. For this reason, for example, as shown in FIG. 5A, when the first reflection film 161 is formed on the first wall surface 61a by deposition or sputtering, the first reflection film 161 having excellent flatness and high reflectance can be formed by depositing the material M from the normal direction of the first wall surface 61a. In this embodiment, the first reflection film 161 is formed on the first wall surface 61a with high surface accuracy, so that excellent reflection characteristics can be realized. FIG. 5A is an explanatory diagram of the state of the reflection film formed in the light source device 100 of this embodiment. In FIG. 5A, the scattering range of the material M from the material source is typically shown by a broken line.

[0089] The same can be said about the case where the second reflective film 162 is formed on the second wall surface 62a, and the second reflective film 162 having excellent flatness and high reflectance can be formed. In addition, since the second reflective film 162 is formed on the second wall surface 62a having high surface accuracy, excellent reflection characteristics can be realized.

[0090] On the other hand, as shown in Fig. 5B, when a reflective film is formed on the wall surface of a holding groove formed in a single member as a comparative example, the material M scatters from a direction substantially horizontal to the groove wall surface 159 perpendicular to the groove bottom, so that the film cannot be formed as designed, and the film formation becomes uneven, so that a reflective film with a high reflectance like that of the light source device 100 of this embodiment cannot be formed. Fig. 5B is an explanatory diagram of the film formation state of the reflective film in the comparative example. In Fig. 5B, the scattering range of the material M from the material source is typically shown by a dashed line.

[0091] A dimension W1 along the Z-axis direction of the light-emitting surface 56a of the light-emitting element 56 is larger than a width B2 along the Z-axis direction of the wavelength conversion member 50. Note that the width along the Z-axis direction of the wavelength conversion member 50 in this embodiment is uniform over the entire longitudinal direction. As a result, in the Z-axis direction, both ends of the light-emitting surface 56a of the light-emitting element 56 protrude outside the third surface 50c of the wavelength conversion member 50. Specifically, both ends of the light-emitting surface 56a of the light-emitting element 56 protrude to positions overlapping the gap between the third surface 50c and the first wall surface 61a and the gap between the fourth surface 50d and the second wall surface 62a. In other words, when the light-emitting surface 56a is viewed along the Y-axis direction from the support surface 54s, a part of the light-emitting surface 56a overlaps with the first surface 50a, and another part of the light-emitting surface 56a overlaps with the gap between the third surface 50c and the first wall surface 61a and the gap between the fourth surface 50d and the second wall surface 62a.

[0092] The first width D2 of the support surface 54s of the holding groove 59 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 protrude outside the second surface 50b of the wavelength conversion member 50 in the Z-axis direction. In other words, when the support surface 54s is viewed from the light-emitting surface 56a along the Y-axis direction, a part of the support surface 54s overlaps with the second surface 50b, and another part of the support surface 54s is exposed outside the second surface 50b. In this way, the support surface 54s has an exposed portion 54r exposed to the outside of the wavelength conversion member 50.

[0093] According to the light source device 100 of this embodiment, a part of the excitation light E2 emitted from the light emitting surface 56a of the light emitting element 56 passes through the gap between the third surface 50c of the wavelength conversion member 50 and the first portion 61a1, and then enters the second portion 61a2 inclined with respect to the support surface 54s. At this time, the excitation light E2 is reflected by the first reflection film 161 provided on the second portion 61a2 and enters the third surface 50c of the wavelength conversion member 50. In this way, the excitation light E2 passing through the gap between the third surface 50c of the wavelength conversion member 50 and the first wall surface 61a is more likely to enter the third surface 50c, so that the amount of the excitation light E reflected by the support surface 54s and returning to the light source unit 51 can be reduced. Also, a part of the excitation light E is reflected by the first portion 61a1 extending perpendicularly to the support surface 54s and enters the third surface 50c of the wavelength conversion member 50. Similarly, the excitation light E that has entered between the fourth surface 50d of the wavelength conversion member 50 and the second wall surface 62a is reflected by the second reflective film 162 provided on the third portion 62a1 or the fourth portion 62a2, and enters the fourth surface 50d of the wavelength conversion member 50. As described above, according to the light source device 100 of this embodiment, the utilization efficiency of the excitation light E is high, and it is possible to obtain fluorescent light Y having a desired intensity.

[0094] As described above, the light source device 100 of the present embodiment comprises: a light-emitting element 56 that emits excitation light E; a wavelength conversion member 50 having a first surface 50a on which the excitation light E emitted from the light-emitting element 56 is incident, a second surface 50b facing opposite to the first surface 50a, and a third surface 50c and a fourth surface 50d that intersect the first surface 50a and the second surface 50b and face opposite to each other; a support member 54 that forms a bottom surface of a holding groove 59 that holds the wavelength conversion member 50 and includes a support surface 54s that supports the second surface 50b of the wavelength conversion member 50; a first side wall portion 61 that is arranged opposite the third surface 50c of the wavelength conversion member 50 and includes a first wall surface 61a that forms one of the inner surfaces of the holding groove 59; and a second side wall portion 62 that is arranged opposite the fourth surface 50d of the wavelength conversion member 50 and includes a second wall surface 62a that forms the other inner surface of the holding groove 59. The first side wall portion 61 and the second side wall portion 62 are formed as separate members from the support portion 63 .

[0095] According to light source device 100 of the present embodiment, since holding groove 59 has a divided structure with multiple parts, holding groove 59 can be composed of first wall surface 61a, second wall surface 62a, and support surface 54s with high surface accuracy. Since second surface 50b of wavelength conversion member 50 is held in holding groove 59 in a state of good contact with support surface 54s, heat generated in wavelength conversion member 50 is efficiently transferred to support portion 63 via support surface 54s. Therefore, light source device 100 of the present embodiment can enhance the heat dissipation of wavelength conversion member 50, and can emit bright fluorescence Y from wavelength conversion member 50.

[0096] The projector 1 of this embodiment is equipped with the light source device 100 that extracts bright fluorescent light Y, and therefore has excellent light utilization efficiency.

[0097] (First Modification) A first modified example of this embodiment will be described below. 6 is a cross-sectional view showing the configuration of the support member of the first modified example. In the following drawings, components common to the support member 54 of the above embodiment are given the same reference numerals, and description thereof will be omitted.

[0098] 6, the support member 154 of this modified example has a base member 160 and a holding groove 59. In this modified example, the base member 160 is configured as an integral member with the support portion 63. The base member 160 has a holding surface 160a that holds the first side wall portion 61 and the second side wall portion 62. In this modified example, the holding surface 160a of the base member 160 is a flat surface.

[0099] In the support member 54 of the above embodiment, the support surface 54s of the support portion 63 protrudes in the Y-axis direction relative to the surface of the base member 60. In contrast, in the support member 154 of this modified example, the support surface 54s of the support portion 63 is flush with the holding surface 160a of the base member 160 in the Y-axis direction. In this modification, a reflective film 163 similar to the first reflective film 161 and the second reflective film 162 is formed on the support surface 54s that constitutes the bottom surface of the holding groove 59. Note that the reflective film 163 may be omitted as necessary.

[0100] According to the supporting member 154 of this modification, the supporting surface 54s of the supporting portion 63 and the holding surface 160a of the base member 160 are flush with each other, which improves the workability of the supporting surface 54s and the holding surface 160a, and therefore it is possible to form the supporting surface 54s and the holding surface 160a with high surface accuracy. This improves the positional accuracy of the first wall surface 61a of the first side wall portion 61 and the second wall surface 62a of the second side wall portion 62 arranged on the holding surface 160a, and the supporting surface 54s, so that the surface accuracy of the inner surface of the holding groove 59 can be further improved.

[0101] (Second Modification) A second modified example of this embodiment will now be described. 7 is a cross-sectional view showing the configuration of the support member of the second modified example. In the following drawings, components common to the support member 54 of the above embodiment are given the same reference numerals, and description thereof will be omitted.

[0102] 7, the support member 254 of this modification has a base member 260 and a holding groove 59. In this modification, the base member 260 is made of a material different from that of the support portion 63. The base member 260 holds the support portion 63, the first side wall portion 61, and the second side wall portion 62. In this modification, the holding groove 59 is formed by combining the support portion 63, the first side wall portion 61, and the second side wall portion 62, which are separate members from the base member 260.

[0103] According to the support member 254 of this modification, the support portion 63, the first side wall portion 61, and the second side wall portion 62 constituting the holding groove 59 are each separate members, so that the first wall surface 61a, the second wall surface 62a, and the support surface 54s can be individually machined by an appropriate method. Therefore, the surface precision of the first wall surface 61a, the second wall surface 62a, and the support surface 54s can be simply and easily improved.

[0104] In this modification, it is desirable that the thermal conductivity of supporting portion 63 is higher than the thermal conductivity of base member 260. For example, supporting portion 63 is made of an aluminum alloy, and base member 260 is made of aluminum die-casting. With this configuration, heat from wavelength conversion member 50 is efficiently conducted to supporting portion 63, thereby improving the heat dissipation property of wavelength conversion member 50.

[0105] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the wavelength conversion member 50 in the above embodiment is configured in the shape of a rectangular prism having six faces extending along the X-axis, and the angle conversion member 52 is provided on the fifth face 50e, which is the light exit portion; however, the angle conversion member 52 may be omitted by integrally forming a rectangular truncated pyramid-shaped light exit portion at the end of the wavelength conversion member 50 on the light exit side.

[0106] In the above embodiment, the first wall surface 61a and the second wall surface 62a of the holding groove 59 are spaced apart from the side surface of the wavelength conversion member 50, but a configuration in which the side surface of the wavelength conversion member 50 abuts against the first wall surface or the second wall surface may be adopted. With this configuration, the contact area between the wavelength conversion member and the holding groove increases, thereby further improving the heat dissipation of the wavelength conversion member.

[0107] In the above embodiment, the first side wall portion 61 and the second side wall portion 62 are separate members from the support portion 63, but either one of the first side wall portion 61 and the second side wall portion 62 may be integrally formed with the support portion 63. In other words, the holding groove 59 may be formed by combining two parts.

[0108] In the above embodiment, an example was given of the base member 60 having a first wall accommodating portion 547 that holds the first side wall portion 61 and a second wall accommodating portion 548 that holds the second side wall portion 62, but the base member 60 may have only one of the first wall accommodating portion 547 and the second wall accommodating portion 548.

[0109] In the above embodiment, the first wall surface 61a and the second wall surface 62a of the holding groove 59 have a portion perpendicular to the support surface 54s and a portion inclined relative to the support surface 54s, but the shape of the holding groove 59 is not particularly limited, and for example, the entire area of ​​the wall surface of the holding groove may be perpendicular to the support surface. Also, the wall surface of the holding groove may be curved.

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

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

[0112] In the above embodiment, the wavelength conversion member 50 is pressed against the support member 54 by two pressing members 90, but the number of pressing members 90 is not limited to this. For example, when the amount of excitation light E incident on the wavelength conversion member 50 from the light emitting element 56 can be ensured, three or more pressing members 90 may be provided.

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

[0114] The following is a summary of this disclosure. (Appendix 1) A light emitting element that emits light; a light guiding member having a first surface on which the light emitted from the light emitting element is incident, a second surface facing away from the first surface, third and fourth surfaces intersecting the first and second surfaces and facing away from each other, and a light emitting portion that emits the light; a support portion including a support surface that forms a bottom surface of a holding groove that holds the light guiding member and supports the second surface of the light guiding member; a first side wall portion including a first wall surface that is disposed opposite the third surface of the light guiding member and that constitutes one of the inner surfaces of the holding groove; a second side wall portion including a second wall surface that is disposed opposite the fourth surface of the light guiding member and that constitutes the other inner surface of the holding groove; Equipped with At least one of the first side wall portion and the second side wall portion is formed of a separate member from the support portion. Light source device.

[0115] According to the light source device having this configuration, the holding groove has a divided structure, so that the holding groove can be composed of a first wall surface, a second wall surface, and a support surface with high surface accuracy. Since the second surface of the light guide member is held in the holding groove in a state of good contact with the support surface, heat generated in the light guide member is efficiently transferred to the support part via the support surface. Therefore, the light source device having this configuration can improve the heat dissipation of the light guide member, so that bright light can be emitted from the light emission part of the light guide member.

[0116] (Appendix 2) The first side wall portion and the second side wall portion are each formed of a separate member from the support portion. 2. A light source device as described in claim 1.

[0117] According to this configuration, since the first side wall portion and the second side wall portion are separate members from the support portion, it is possible to process only the support portion independently, thereby further improving the surface precision of the support surface of the support portion.

[0118] (Appendix 3) The support portion further includes a first side and a second side intersecting the support surface; the first side wall portion and the second side wall portion are each formed of a separate member from the support portion, the first side wall portion abuts against the first side surface of the support portion, The second side wall portion abuts against the second side surface of the support portion. 3. A light source device according to claim 1 or 2.

[0119] According to this configuration, by butting the first side wall portion and the second side wall portion against the support portion, each of them can be easily positioned.

[0120] (Appendix 4) A base member formed integrally with the support portion is further provided, the first side wall portion and the second side wall portion are each formed of a separate member from the support portion, the base member has a holding surface that holds at least one of the first side wall portion and the second side wall portion, The support surface of the base member and the holding surface of the base member are flush with each other. 3. A light source device according to claim 1 or 2.

[0121] This configuration improves the workability of the flush support surface and holding surface, making it possible to form support surfaces and holding surfaces with high surface accuracy. This improves the positional accuracy of the support surface and the first wall surface of the first side wall portion and the second wall surface of the second side wall portion arranged on the holding surface, making it possible to further improve the surface accuracy of the inner surface of the holding groove.

[0122] (Appendix 5) The support portion further includes a base member made of a different material from the base member. The base member holds the support portion and at least one of the first side wall portion and the second side wall portion. 4. A light source device according to claim 1.

[0123] According to this configuration, since the support portion, the first side wall portion, and the second side wall portion are each separate members, the first wall surface, the second wall surface, and the support surface can be individually processed by an appropriate method, and thus the surface precision of the first wall surface, the second wall surface, and the support surface can be simply and easily improved.

[0124] (Appendix 6) The thermal conductivity of the support portion is higher than the thermal conductivity of the base member. 6. A light source device as described in appended claim 5.

[0125] According to this configuration, heat from the light guide member is efficiently transferred to the support portion, so that the heat dissipation property of the light guide member can be improved.

[0126] (Appendix 7) a base member that holds at least one of the first side wall portion and the second side wall portion, The base member has a recess for holding at least one of the first side wall portion and the second side wall portion. 7. A light source device according to any one of claims 1 to 6.

[0127] According to this configuration, by guiding at least one of the first side wall portion and the second side wall portion into the recess, alignment with the support portion becomes easy.

[0128] (Appendix 8) At least one of the first side wall portion and the second side wall portion is disposed apart from the light guiding member and has a reflective film that reflects the light emitted from the light emitting element toward the light guiding member. 8. A light source device according to any one of claims 1 to 7.

[0129] According to this configuration, the light emitted from the light emitting element is reflected to the light guide member by the reflective film, thereby making it possible to improve the light utilization efficiency of the light emitted from the light emitting element.

[0130] (Appendix 9) The light guide member abuts on the first side wall portion or the second side wall portion. 9. A light source device according to any one of claims 1 to 8.

[0131] According to this configuration, the contact area between the light guide member and the holding groove increases, thereby further improving the heat dissipation property of the light guide member.

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

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

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

[0135] According to the projector having this configuration, since it is equipped with the above-mentioned light source device, it is possible to provide a projector with excellent light utilization efficiency. [Explanation of symbols]

[0136] 1...projector, 4B, 4G, 4R...light modulation device, 6...projection optical device, 50...wavelength conversion member (light guiding member), 50a...first surface, 50b...second surface, 50c...third surface, 50d...fourth surface, 50e...fifth surface (light emitting portion), 54s...support surface, 56...light emitting element, 59...holding groove, 60, 160, 260...base member, 61...first side wall portion, 61a...first wall surface, 62...second side wall portion, 62a...second wall surface, 63...support portion, 63a...first side surface, 63b...second side surface, 100...light source device, 160a...holding surface, 163...reflective film, E...excitation light (first light), Y...fluorescence (second light).

Claims

1. A light emitting element that emits light; a light guiding member including a first surface on which the light emitted from the light emitting element is incident, a second surface facing in a direction opposite to the first surface, a third surface and a fourth surface intersecting the first surface and the second surface and facing in opposite directions to each other, and a light emitting portion that emits the light; a support portion including a support surface that forms a bottom surface of a holding groove that holds the light guiding member and supports the second surface of the light guiding member; a first side wall portion including a first wall surface that is disposed opposite the third surface of the light guiding member and that constitutes one of the inner surfaces of the holding groove; a second side wall portion including a second wall surface that is disposed opposite the fourth surface of the light guiding member and that constitutes the other inner surface of the holding groove; Equipped with At least one of the first side wall portion and the second side wall portion is formed of a separate member from the support portion. Light source device.

2. The first side wall portion and the second side wall portion are each formed of a separate member from the support portion. The light source device according to claim 1 .

3. The support portion further includes a first side and a second side intersecting the support surface, the first side wall portion and the second side wall portion are each formed of a separate member from the support portion, the first side wall portion abuts against the first side surface of the support portion, The second side wall portion abuts against the second side surface of the support portion. The light source device according to claim 1 .

4. A base member formed integrally with the support portion is further provided, the first side wall portion and the second side wall portion are each formed of a separate member from the support portion, the base member has a holding surface that holds at least one of the first side wall portion and the second side wall portion, The support surface of the base member and the holding surface of the base member are flush with each other. The light source device according to claim 1 .

5. The support portion further includes a base member made of a different material from the base member. The base member holds the support portion and at least one of the first side wall portion and the second side wall portion. The light source device according to claim 1 .

6. The thermal conductivity of the support portion is higher than the thermal conductivity of the base member. The light source device according to claim 5 .

7. a base member for holding at least one of the first side wall portion and the second side wall portion; The base member has a recess for holding at least one of the first side wall portion and the second side wall portion. The light source device according to claim 1 .

8. At least one of the first side wall portion and the second side wall portion is disposed apart from the light guiding member and has a reflective film that reflects the light emitted from the light emitting element toward the light guiding member. The light source device according to claim 1 .

9. The light guide member abuts on the first side wall portion or the second side wall portion. The light source device according to claim 1 .

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

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

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