Light source device and projector

Abstract

To provide a light source device and a projector capable of obtaining desired output light.SOLUTION: A light source device comprises: a light-emitting element; a light guide member; a supporting member supporting the light guide member on a groove part; and a holding member holding the light guide member outside the groove part. The light guide member includes: a first surface and a second surface located opposite in a first axis along a longitudinal direction of the light guide member; a third surface and a fourth surface located opposite in a second axis crossing the first axis; and a fifth surface and a sixth surface located opposite in a third axis crossing the first axis and the second axis. The first surface of the light guide member emits light guided by the light guide member. The light-emitting element is provided opposite the third surface. The groove part includes a supporting surface, a first wall surface and a second wall surface. The light guide member includes a projection part having at least one end of both ends at the first axis projecting outward from the groove part, the projection part being held by the holding member.SELECTED DRAWING: Figure 3

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 that emits excitation light, a rod-shaped phosphor that converts the excitation light into fluorescence, and a heat conductive member that releases heat generated by the phosphor. The phosphor is disposed inside a groove in the heat conductive member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 254455 Summary of the Invention [Problem to be solved by the invention]

[0005] In this type of light source device, the excitation light emitted from the light-emitting element spreads beyond the width of the phosphor and is thought to enter the gap between the wall surface of the groove and the phosphor. However, in the light source device of Patent Document 1, the phosphor is disposed close to one wall surface of the groove, so that almost no excitation light is incident from the side surface of the phosphor close to the wall surface. This reduces the efficiency of use of the excitation light, and there is a risk that fluorescence with the desired intensity cannot be obtained.

[0006] In order to improve the efficiency of using the excitation light, it is possible to provide a gap between both side surfaces of the phosphor and the wall surface of the groove. In this case, the positional accuracy of the phosphor in the groove decreases, which may reduce the efficiency of incidence of the excitation light on the phosphor, making it difficult to obtain fluorescence with the desired intensity. [Means for solving the problem]

[0007] In order to solve the above problems, a light source device according to one aspect of the present invention includes a light emitting element that emits light, a light guide member into which the light emitted from the light emitting element is incident, a support member having a groove and supporting the light guide member inside the groove, and a holding member that holds the light guide member outside the groove of the support member, wherein the light guide member has a first surface and a second surface located opposite to each other along a first axis along a longitudinal direction of the light guide member, a third surface and a fourth surface located opposite to each other along a second axis intersecting the first axis, and a fourth surface located opposite to each other along the first axis and the second axis. the light-guiding member has a fifth surface and a sixth surface located opposite each other along a third axis, the first surface of the light-guiding member emits light guided through the light-guiding member, the light-emitting element is provided opposite the third surface, the groove portion has a support surface facing the fourth surface, a first wall surface facing the fifth surface and spaced apart from the fifth surface, and a second wall surface facing the sixth surface and spaced apart from the sixth surface, the light-guiding member has a protrusion, at least one of both ends on the first axis protruding outside the groove portion, and the protrusion is held by the holding member.

[0008] A projector of one embodiment of the present invention comprises a light source device of one embodiment of the present invention, a light modulation device that modulates light emitted from the light source device in accordance with image information, and a projection optical device that projects the light modulated by the light modulation device. [Brief description of the drawings]

[0009] [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. [Diagram 5] 4 is a cross-sectional view of the light source device taken along line VV in FIG. [Figure 6] 11A and 11B are diagrams illustrating problems with a light source device of a comparative example. [Figure 7] 11A and 11B are diagrams illustrating other problems with the light source device of the comparative example. [Figure 8] 11 is a plan view of the light source device of the first modified example as viewed from the Y-axis direction. FIG. [Figure 9] 13 is a plan view of a light source device of a second modified example as viewed from the Y-axis direction. FIG. [Figure 10] 13 is a plan view of a light source device of a third modified example as viewed from the Y-axis direction. FIG. [Figure 11] 13 is a plan view of a light source device according to a fourth modified example as viewed from the Y-axis direction. FIG. [Figure 12A] 13 is a cross-sectional view of a main part showing a configuration of a holding piece according to a modified example. FIG. [Figure 12B] FIG. 12B is a diagram showing a configuration according to a modified example of FIG. 12A. [Figure 12C] 13 is a cross-sectional view of a main part showing a configuration of a holding piece according to a modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [First embodiment] A first embodiment of the present invention will now 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] The color separation optical system 3 separates the yellow fluorescence Y emitted from the first illumination device 20 into red light LR and green light LG. The color separation optical system 3 includes a dichroic mirror 7, a first reflecting mirror 8a, and a second reflecting mirror 8b.

[0016] The dichroic mirror 7 separates the fluorescence Y into red light LR and green light LG. The dichroic mirror 7 transmits the red light LR and reflects the green light LG. The second reflecting mirror 8b is disposed in the optical path of the green light LG. The second reflecting mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the optical modulation device 4G. The first reflecting mirror 8a is disposed in the optical path of the red light LR. The first reflecting mirror 8a reflects the red light LR transmitted through the dichroic mirror 7 toward the optical modulation device 4R.

[0017] On the other hand, the blue light LB emitted from the second illumination device 21 is reflected by the reflecting mirror 9 towards the light modulation device 4B.

[0018] The 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 84, and a relay lens 85. 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.

[0019] 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.

[0020] The blue light LB diffused by the diffusion plate 83 is incident on the rod lens 84. The rod lens 84 has a prismatic shape extending along the optical axis AX2 direction of the second illumination device 21. The rod lens 84 has a light incident end surface 84a provided at one end and a light exit end surface 84b provided at the other end. The diffusion plate 83 is fixed to the light incident end surface 84a of the rod lens 84 via an optical adhesive (not shown). It is desirable to match the refractive index of the diffusion plate 83 and the refractive index of the rod lens 84 as closely as possible.

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

[0022] The shape of the light exit end surface 84b of the rod lens 84 is a rectangle that is approximately similar to the shape of the image forming area of ​​the light modulation device 4B. This allows the blue light LB exiting from the rod lens 84 to efficiently enter the image forming area of ​​the light modulation device 4B.

[0023] The light modulation device 4R modulates the red light LR according to image information to form image light corresponding to the red light LR. The light modulation device 4G modulates the green light LG according to image information to form image light corresponding to the green light LG. The light modulation device 4B modulates the blue light LB according to image information to form image light corresponding to the blue light LB.

[0024] For example, a transmissive liquid crystal panel is used for each of the light modulation devices 4R, 4G, and 4B. A polarizing plate (not shown) is disposed on the entrance side and exit side of each of the liquid crystal panels. The polarizing plate transmits only linearly polarized light in a specific direction.

[0025] A field lens 10R is disposed on the incident side of the optical modulation device 4R. A field lens 10G is disposed on the incident side of the optical modulation device 4G. A field lens 10B is disposed on the incident side of the optical modulation device 4B. The field lens 10R collimates the chief ray of the red light LR incident on the optical modulation device 4R. The field lens 10G collimates the chief ray of the green light LG incident on the optical modulation device 4G. The field lens 10B collimates the chief ray of the blue light LB incident on the optical modulation device 4B.

[0026] The light combining element 5 receives the image light emitted from the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, combines the image light corresponding to the red light LR, the green light LG, and the blue light LB, and emits the combined image light toward the projection optical device 6. The light combining element 5 may be, for example, a cross dichroic prism.

[0027] The projection optical device 6 is composed of a plurality of projection lenses. The projection optical device 6 enlarges and projects the image light combined by the light combining element 5 onto the screen SCR. As a result, a color image is displayed on the screen SCR.

[0028] Next, the configuration of the first illumination device 20 will be described. FIG. 2 is a schematic configuration diagram of the first illumination device 20. As shown in FIG. As shown in FIG. 2, the first illumination device 20 includes a light source device 100, an integrator optical system 70, a polarization conversion element 102, and a superimposing optical system 103.

[0029] The light source device 100 includes a wavelength conversion member 50, a light source unit 51, an angle conversion member 52, a mirror 53, a support member 54, a holding member 65, and a pressing member 90. The wavelength conversion member 50 of the present embodiment corresponds to the light guiding member in the claims.

[0030] The wavelength conversion member 50 has a rectangular prism shape extending along the X-axis and has six faces. The sides of the wavelength conversion member 50 extending along the X-axis are longer than the sides extending along the Y-axis and the Z-axis. Therefore, the X-axis corresponds to the longitudinal direction of the wavelength conversion member 50. The lengths of the sides extending along the Y-axis and the Z-axis are equal. That is, the cross-sectional shape of the wavelength conversion member 50 cut along a plane perpendicular to the X-axis is a square. The cross-sectional shape of the wavelength conversion member 50 cut along a plane perpendicular to the X-axis may be a rectangle. The X-axis of this embodiment corresponds to the first axis in the claims. The Y-axis of this embodiment corresponds to the second axis in the claims. The Z-axis of this embodiment corresponds to the third axis in the claims.

[0031] 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 in the +X direction, which is one side of the X-axis direction, and the second surface 50b is located in the -X direction, which is the opposite direction of the X-axis direction.

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

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

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

[0035] The wavelength conversion member 50 includes at least a phosphor, and converts the 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 third surface 50c. The fluorescence Y is guided inside the wavelength conversion member 50 and then emitted from the first surface 50a. The excitation light E in this embodiment corresponds to the first light in the claims. The fluorescence Y in this embodiment corresponds to the second light in the claims.

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

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

[0038] Specifically, the material of the wavelength conversion member 50 includes, for example, an yttrium-aluminum-garnet (YAG) phosphor. Taking YAG:Ce 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 includes a substrate 55 and a light emitting element 56. 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, for example, a light emitting diode (LED). The light emitting surface 56a of the light emitting element 56 faces the third surface 50c of the wavelength conversion member 50, and emits excitation light E toward the third surface 50c. 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. In this way, the light source unit 51 is provided facing one side surface 50c of the four side surfaces 50c, 50d, 50e, and 50f along the longitudinal direction of the wavelength conversion member 50.

[0040] The substrate 55 supports the light-emitting elements 56. In this embodiment, a plurality of light-emitting elements 56 are provided on one surface 55a of the substrate 55. In this embodiment, the light source unit 51 is composed of the light-emitting elements 56 and the substrate 55, but may also include other optical members such as a light guide plate, a diffusion plate, and a lens. In this embodiment, a plurality of light-emitting elements 56 are used, but the number of light-emitting elements 56 is not particularly limited.

[0041] The support member 54 has a groove 154, supports the wavelength conversion member 50 inside the groove 154, and dissipates heat generated in the wavelength conversion member 50 to the outside. For this reason, it is preferable that the support member 54 is made of a material that has a predetermined strength and 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 preferable to use an aluminum alloy such as 6061 series. The specific configuration of the support member 54 will be described later.

[0042] The holding member 65 holds the wavelength conversion member 50 outside the groove portion 154 of the support member 54. Therefore, the wavelength conversion member 50 is in a state where a part of the wavelength conversion member 50 protrudes outside the groove portion 154 of the support member 54 without contacting the wall surface of the groove portion 154. The holding member 65 holds the part of the wavelength conversion member 50 that protrudes outside the groove portion 154. The holding member 65, together with the pressing member 90, regulates the position of the wavelength conversion member 50 with respect to the support member 54. The specific configuration of the holding member 65 will be described later.

[0043] 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.

[0044] 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 50c, 50d, 50e, and 50f travels toward the first surface 50a or the second surface 50b while repeating total reflection at multiple points on the side surfaces 50c, 50d, 50e, and 50f. The first surface 50a emits the fluorescence Y that has been guided inside the wavelength conversion member 50 by being propagated by total reflection. In the case of this embodiment, the fluorescence Y traveling toward the first surface 50a is incident on the angle conversion member 52 provided on the first surface 50a. The fluorescence Y traveling toward the second surface 50b is reflected by the mirror 53 and travels toward the first surface 50a.

[0045] Of the excitation light E incident on the wavelength conversion member 50, a portion of the excitation light E that is not used to excite the phosphor is reflected by the members surrounding the wavelength conversion member 50, including the light 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.

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

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

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

[0049] Generally, the etendue of light, which is defined as the product of the area of ​​the light exit region and the solid angle (maximum exit angle) of 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. Therefore, from the viewpoint of etendue preservation, the angle conversion member 52 can make the maximum exit angle of the fluorescence Y on the light exit surface 52b smaller than the maximum incident angle of the fluorescence Y on the light incident surface 52a.

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

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

[0052] A collimating optical system 63 composed 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 63 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 63 does not need to be provided when the parallelism of the fluorescence Y emitted from the angle conversion member 52 is sufficiently high.

[0053] The integrator optical system 70 has a first lens array 61 and a second lens array 101. 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 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 70.

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

[0055] The fluorescence Y emitted from the first lens array 61 travels toward the second lens array 101. The second lens array 101 is disposed opposite to the first lens array 61. The second lens array 101 has a plurality of second small lenses 101a corresponding to the plurality of first small lenses 61a of the first lens array 61. The second lens array 101, together with the superimposing optical system 103, forms each of the images of the plurality of first small lenses 61a of the first lens array 61 in the vicinity of the image forming areas of the light modulation devices 4R and 4G. The plurality of second small lenses 101a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20.

[0056] In this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 101a of the second lens array 101 have the same size, but may have different sizes. In this embodiment, the first small lenses 61a of the first lens array 61 and the second small lenses 101a of the second lens array 101 are arranged so that their optical axes coincide with each other, but may be arranged eccentrically with each other.

[0057] 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.

[0058] 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.

[0059] The features of the light source device 100 of this embodiment will be described below. 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. Fig. 5 is a cross-sectional view of the light source device 100 taken along line VV in Fig. 3.

[0060] As shown in FIG. 3, the support member 54 has a groove portion 154, 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.

[0061] The groove portion 154 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. In this embodiment, the wavelength conversion member 50 protrudes to the outside of the groove portion 154.

[0062] 4, the groove 154 of the support member 54 has a U-shaped cross section perpendicular to the X-axis direction. The groove 154 has a support surface 54s, a first wall surface 54a, and a second wall surface 54b.

[0063] The support surface 54s corresponds to the bottom surface of the groove 154 and faces the fourth surface 50d of the wavelength conversion member 50. In the present embodiment, the support surface 54s extends parallel to the XZ plane. The first wall surface 54a corresponds to one side surface of the groove 154, faces the fifth surface 50e of the wavelength conversion member 50, and is spaced apart from the fifth surface 50e. The second wall surface 54b corresponds to the other side surface of the groove 154, faces the sixth surface 50f of the wavelength conversion member 50, and is spaced apart from the sixth surface 50f. That is, a gap is provided between the first wall surface 54a and the fifth surface 50e of the wavelength conversion member 50. A gap is provided between the second wall surface 54b and the sixth surface 50f of the wavelength conversion member 50.

[0064] The first wall surface 54a has a first portion 54a1 located on the third surface 50c side and a second portion 54a2 located on the support surface 54s side. The first portion 54a1 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The second portion 54a2 inclines so as to approach the fifth surface 50e from the first portion 54a1 side toward the support surface 54s side. In other words, the distance between the second portion 54a2 on the support surface 54s side and the fifth surface 50e is smaller than the distance between the second portion 54a2 on the first portion 54a1 side and the fifth surface 50e.

[0065] The second wall surface 54b has a third portion 54b3 located on the third surface 50c side and a fourth portion 54b4 located on the support surface 54s side. The third portion 54b3 extends in a direction perpendicular to the support surface 54s, i.e., parallel to the XY plane. The fourth portion 54b4 is inclined so as to approach the sixth surface 50f from the third portion 54b3 side toward the support surface 54s side. In other words, the distance between the fourth portion 54b4 and the sixth surface 50f on the support surface 54s side is smaller than the distance between the fourth portion 54b4 and the sixth surface 50f on the third portion 54b3 side.

[0066] Each of the first wall surface 54a and the second wall surface 54b is made of a surface of a metal such as aluminum or stainless steel, which is a material of the support member 54. More specifically, each of the first wall surface 54a and the second wall surface 54b is made of a processed surface that is a mirror-finished surface of the above-mentioned metal surface. Therefore, each of the first wall surface 54a and the second wall surface 54b has light reflectivity and reflects the incident excitation light E. Note that each of the first wall surface 54a and the second wall surface 54b may be made of another metal film or a dielectric multilayer film formed on a surface of a metal such as aluminum or stainless steel.

[0067] 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 fifth surface 50e and the first wall surface 54a and the gap between the sixth surface 50f and the second wall surface 54b. In other words, when the light-emitting surface 56a is viewed along the Y-axis direction from the support surface 54s, a part of the light-emitting surface 56a overlaps with the third surface 50c, and another part of the light-emitting surface 56a overlaps with the gap between the fifth surface 50e and the first wall surface 54a and the gap between the sixth surface 50f and the second wall surface 54b.

[0068] The first width D2 of the support surface 54s of the support member 54 along the Z-axis direction is larger than the width B2 of the wavelength conversion member 50 along the Z-axis direction. As a result, both ends of the support surface 54s in the Z-axis direction protrude outside the fourth surface 50d of the wavelength conversion member 50. In other words, when the support surface 54s is viewed from the light-emitting surface 56a along the Y-axis direction, a part of the support surface 54s overlaps with the fourth surface 50d, and another part of the support surface 54s is exposed outside the fourth surface 50d. In this way, the support surface 54s has an exposed portion 54r exposed to the outside of the wavelength conversion member 50.

[0069] As shown in FIGS. 3 to 5, the pressing member 90 regulates the position of the wavelength conversion member 50 in the Z axis direction relative to the support member 54 inside the groove portion 154. The pressing member 90 is made of an elastically deformable material. As an example, the pressing member 90 is made of a leaf spring made of a metal material, for example, a stainless steel material such as SUS304. The pressing member 90 may be made of a material such as resin or rubber as long as the material is elastically deformable. However, it is preferable that the pressing member 90 is made of a material such as a metal material that has excellent light resistance and heat resistance.

[0070] 3 and 5, when viewed in the Y-axis direction perpendicular to the third surface 50c of the wavelength conversion member 50, the pressing member 90 is disposed at a position not overlapping with the light emitting element 56 of the light source unit 51, and presses the wavelength conversion member 50 against the support surface 54s of the groove portion 154 of the support member 54. The pressing member 90 is formed of a spring member such as a leaf spring. In this manner, the position of the wavelength conversion member 50 in the Z-axis direction relative to the support member 54, i.e., the movement in the Z-axis direction, is restricted by the pressing member 90.

[0071] In this embodiment, the pressing member 90 is disposed at a position not overlapping with the light emitting element 56 and at the center in the longitudinal direction of the wavelength conversion member 50. The pressing member 90 does not necessarily have to be disposed at the center of the wavelength conversion member 50. For example, when three light emitting elements are disposed with a gap between them, the pressing member is disposed at a position not overlapping with each light emitting element and overlapping with a region between two light emitting elements.

[0072] The wavelength conversion member 50 has a first protrusion 151 and a second protrusion 152 that protrude outside the groove 154. The first protrusion 151 is a portion that protrudes from the groove 154 in the +X direction, and the second protrusion 152 is a portion that protrudes from the groove 154 in the -X direction. In the wavelength conversion member 50, the first protrusion 151 corresponds to the end of the wavelength conversion member 50 in the +X direction, that is, on the first surface 50a side, and the second protrusion 152 corresponds to the end of the wavelength conversion member 50 in the -X direction, that is, on the second surface 50b side. The wavelength conversion member 50 of this embodiment has the first protrusion 151 on the first surface 50a side in the X-axis direction, and the second protrusion 152 on the second surface 50b side in the X-axis direction. That is, the wavelength conversion member 50 of this embodiment has the first protrusion 151 and the second protrusion 152 that protrude outside the groove 154 at both ends on the X-axis.

[0073] The first housing portion 541 is a recess communicating with the groove portion 154 in the +X direction. The first housing portion 541 penetrates to the outer edge 540 of the support member 54. The first housing portion 541 houses the first protruding portion 151 of the wavelength conversion member 50 protruding from the groove portion 154. The first housing portion 541 houses 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 is provided on the first surface 50a of the first protruding portion 151. The light exit surface 52b of the angle conversion member 52 housed in the first housing portion 541 is flush with the outer edge 540 of the support member 54 in a plan view.

[0074] The second accommodating portion 542 is a recess communicating with the groove portion 154 in the -X direction. The second accommodating portion 542 penetrates to the outer edge 540 of the support member 54. The second accommodating portion 542 accommodates the second protruding portion 152 of the wavelength conversion member 50 protruding from the groove portion 154. The second accommodating portion 542 is provided in a state not communicating with the outer edge 540 of the support member 54. The second accommodating portion 542 accommodates the second protruding portion 152 of the wavelength conversion member 50 protruding from the groove portion 154. In this embodiment, the mirror 53 is provided on the second surface 50b of the second protruding portion 152. The second accommodating portion 542 accommodates the mirror 53 provided on the second surface 50b of the wavelength conversion member 50.

[0075] The third accommodating portion 543 is a recess that communicates with the first accommodating portion 541 in the +Z direction. The third accommodating portion 543 accommodates a holding member 65 that holds the first protrusion 151 of the wavelength conversion member 50 accommodated in the first accommodating portion 541.

[0076] The fourth accommodating portion 544 is a recess that communicates with the first accommodating portion 541 in the -Z direction. The fourth accommodating portion 544 accommodates a holding member 65 that holds the first protrusion 151 of the wavelength conversion member 50 accommodated in the first accommodating portion 541.

[0077] The fifth accommodating portion 545 is a recess that communicates with the second accommodating portion 542 in the +Z direction. The fifth accommodating portion 545 accommodates a holding member 65 that holds the second protrusion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0078] The sixth accommodating portion 546 is a recess that communicates with the third accommodating portion 543 in the -Z direction. The sixth accommodating portion 546 accommodates a holding member 65 that holds the second protrusion 152 of the wavelength conversion member 50 accommodated in the second accommodating portion 542.

[0079] The holding member 65 holds the first protruding portion 151 and the second protruding portion 152 of the wavelength conversion member 50 . The holding member 65 has a pair of first holding pieces 651 and 652, a pair of second holding pieces 653 and 654, and a position adjustment portion 655. One of the first holding pieces 651 has a first holding surface 6511 facing a part of the fifth surface 50e corresponding to the surface in the +Z direction of the first protruding portion 151 of the wavelength conversion member 50. The first holding piece 651 is accommodated in the third accommodation portion 543. The surface of the first protruding portion 151 facing the first holding piece 651 corresponds to the fifth surface 50e. That is, the fifth surface 50e, which is the surface of the first protruding portion 151 facing the first holding piece 651, is along the X-axis. In the case of this embodiment, the surface facing the first holding piece 651 is a plane along the X-axis. Therefore, since the first holding surface 6511 is in good contact with the fifth surface 50e, which is a plane, the first holding piece 651 can easily and stably hold the surface in the +Z direction of the first protruding portion 151.

[0080] The other first holding piece 652 has a first holding surface 6521 facing a part of the fifth surface 50e corresponding to the surface in the +Z direction of the second protruding portion 152 of the wavelength conversion member 50. The first holding piece 652 is accommodated in the fourth accommodation portion 544. The surface of the second protruding portion 152 facing the first holding piece 652 corresponds to the fifth surface 50e. That is, the fifth surface 50e, which is the surface of the second protruding portion 152 facing the first holding piece 652, is along the X-axis. In the case of this embodiment, the fifth surface 50e facing the first holding piece 652 is a plane along the X-axis. Therefore, since the first holding surface 6521 is in good contact with the fifth surface 50e which is a plane, the first holding piece 651 can easily and stably hold the surface in the +Z direction of the second protruding portion 152.

[0081] One of the second holding pieces 653 has a second holding surface 6531 facing a part of the sixth surface 50f corresponding to the -Z direction surface of the first protruding portion 151 of the wavelength conversion member 50. The second holding piece 653 is housed in the fifth housing portion 545. The second holding piece 653 is disposed at a predetermined position in the fifth housing portion 545 by being inserted into a pair of positioning pins 6530. The second holding piece 653 is fixed to the support member 54 via a screw 6533. The surface of the first protrusion 151 facing the second holding piece 653 corresponds to the sixth surface 50f. That is, the sixth surface 50f, which is the surface of the first protrusion 151 facing the second holding piece 653, is along the X-axis. In the present embodiment, the sixth surface 50f, which is the surface facing the second holding piece 653, is a plane along the X-axis. Therefore, the second holding surface 6531 is in good contact with the sixth surface 50f, which is a plane, so that the second holding piece 653 can hold the surface of the first protrusion 151 in the -Z direction simply and stably.

[0082] The other second holding piece 654 has a second holding surface 6541 facing a part of the sixth surface 50f corresponding to the -Z direction surface of the second protruding portion 152 of the wavelength conversion member 50. The second holding piece 654 is housed in the sixth housing portion 546. The second holding piece 654 is disposed at a predetermined position in the sixth housing portion 546 by being inserted into a pair of positioning pins 6540. The second holding piece 654 is fixed to the support member 54 via a screw 6543. The surface of the second protrusion 152 facing the second holding piece 654 corresponds to the sixth surface 50f. That is, the sixth surface 50f, which is the surface of the second protrusion 152 facing the second holding piece 654, is along the X-axis. In the present embodiment, the surface facing the second holding piece 654 is a plane along the X-axis. Therefore, the second holding surface 6541 is in good contact with the sixth surface 50f, which is a plane, and therefore the second holding piece 654 can hold the surface of the second protrusion 152 in the -Z direction simply and stably.

[0083] Here, the distance along the Z axis between the first holding surfaces 6511, 6521 of the first holding pieces 651, 652 and the second holding surfaces 6531, 6541 of the second holding pieces 653, 654 is defined as L1. As described above, the width along the Z axis of the support surface 54s of the groove portion 154 is defined as a first width D2. Since the width in the Z axis direction of the wavelength conversion member 50 of this embodiment is uniform over the entirety, the second width along the Z axis of the first protruding portion 151 and the second protruding portion 152 is defined as B2. Hereinafter, the width in the Z axis direction of the first protruding portion 151 and the second protruding portion 152 is referred to as a second width B2.

[0084] The above-mentioned interval L1 is preferably set to be narrower than the first width D2 and equal to the second width B2, but for example, there may be cases where the second width B2 varies due to manufacturing errors or the like, and the interval L1 and the second width B2 do not match. In response to this, the light source device 100 of this embodiment is configured so that the interval L1 can be adjusted by a position adjustment unit 655 described later.

[0085] The position adjustment portion 655 includes a first rail 6551, a second rail 6552, and a plurality of screws 6570, and is capable of adjusting the positions of the first holding pieces 651, 652 in the Z-axis direction.

[0086] The first rail 6551 is a rail extending in the Z-axis direction, and holds the first holding piece 651 housed in the third housing portion 543 so as to be movable in the Z-axis direction. The first holding piece 651 has a rail groove 651a that fits into the first rail 6551. The second rail 6552 is a rail extending in the Z-axis direction, and holds the first holding piece 652 housed in the fourth housing portion 544 so as to be movable in the Z-axis direction. The first holding piece 652 has a rail groove 652a that fits into the second rail 6552.

[0087] The multiple screws 6570 include a first screw 6571 that fixes the first holding piece 651 to the support member 54 and a second screw 6572 that fixes the first holding piece 652 to the support member 54. The first screw 6571 is fastened to a screw hole of the support member 54 via an elongated hole 651b extending in the Z-axis direction provided in the first holding piece 651. Therefore, by loosening the first screw 6571, the first holding piece 651 is made movable in the Z-axis direction along the first rail 6551, and by tightening the first screw 6571, the movement of the first holding piece 651 in the Z-axis direction is restricted. The second screw 6572 is fastened to a screw hole of the support member 54 via an elongated hole 652b extending in the Z-axis direction provided in the first holding piece 652. Therefore, by loosening the second screw 6572, the first holding piece 652 is made movable in the Z-axis direction along the second rail 6552, and by tightening the second screw 6572, movement of the first holding piece 652 in the Z-axis direction is restricted.

[0088] Based on this configuration, the position adjustment unit 655 is capable of adjusting the positions of the first holding pieces 651, 652 in the Z axis direction. When the positions of the first holding pieces 651, 652 change in the Z axis direction, the positions of the first holding surface 6511 of the first holding piece 651 and the first holding surface 6521 of the first holding piece 652 change in the Z axis direction. This allows the first holding surface 6511 of the first holding piece 651 to be in good contact with the fifth surface 50e that forms the first protruding portion 151 of the wavelength conversion member 50, and the first holding surface 6521 of the first holding piece 652 to be in good contact with the fifth surface 50e that forms the second protruding portion 152 of the wavelength conversion member 50. In other words, the distance L1 between the first retaining surfaces 6511, 652a of the first retaining pieces 651, 652 and the second retaining surfaces 6531, 6541 of the second retaining pieces 653, 654 is narrower than the first width D2 of the support surface 54s of the groove portion 154, and can be set to be equal to the second width B2 of the first protrusion 151 and the second protrusion 152.

[0089] Therefore, first protrusion 151 is sandwiched between first holding surface 6511 and second holding surface 6531, and second protrusion 152 is sandwiched between first holding surface 6521 and second holding surface 6541. In this manner, holding member 65 of the present embodiment holds a protrusion of wavelength conversion member 50 that protrudes outward from groove portion 154, thereby being able to hold wavelength conversion member 50 in groove portion 154 in a state in which movement in the Z-axis direction is restricted.

[0090] Here, a method for placing the wavelength conversion member 50 in the groove portion 154 of the support member 54 will be specifically described. First, support member 54 is prepared with holding member 65 removed, and wavelength conversion member 50 is placed inside groove 154. At this time, first protrusion 151 and second protrusion 152 of wavelength conversion member 50 are placed in a state of protruding outside groove 154. Note that angle conversion member 52 and mirror 53 may be fixed to wavelength conversion member 50 in advance, or may be fixed after installation in groove 154 is completed.

[0091] Next, the second holding piece 653 is placed in the fifth housing portion 545 of the support member 54, the second holding piece 654 is placed in the sixth housing portion 546 of the support member 54, and the second holding pieces 653, 654 are fixed with screws 6533, 6543, respectively. By placing the second holding pieces 653, 654, movement of the first protruding portion 151 and the second protruding portion 152 of the wavelength conversion member 50 in the -Z direction is restricted. As a result, the sixth surface 50f of the wavelength conversion member 50 is separated from the second wall surface 54b of the groove portion 154.

[0092] Next, the first holding piece 651 is placed in the third housing portion 543 of the support member 54, and the first holding piece 652 is placed in the fourth housing portion 544 of the support member 54. Specifically, the rail groove 651a of the first holding piece 651 is fitted into the first rail 6551, and the first screw 6571 inserted through the long hole 651b is temporarily fixed to the screw hole of the support member 54. In addition, the rail groove 652a of the first holding piece 652 is fitted into the second rail 6552, and the second screw 6572 inserted through the long hole 652b is temporarily fixed to the screw hole of the support member 54.

[0093] Then, the first holding piece 651 is slid along the first rail 6551 to adjust the position in the Z axis direction, and the first holding surface 6511 of the first holding piece 651 is brought into contact with the fifth surface 50e forming the first protruding portion 151 of the wavelength conversion member 50. Similarly, the first holding piece 652 is slid along the second rail 6552 to adjust the position in the Z axis direction, and the first holding surface 6521 of the first holding piece 652 is brought into contact with the fifth surface 50e forming the second protruding portion 152 of the wavelength conversion member 50. Finally, the first screw 6571 and the second screw 6572 are tightened to fix the first holding pieces 651 and 652 to the support member 54. As a result, the fifth surface 50e of the wavelength conversion member 50 is separated from the first wall surface 54a of the groove portion 154. Finally, the wavelength conversion member 50 is pressed against the support member 54 via the pressing member 90. In this manner, the installation of the support member 54 in the wavelength conversion member 50 within the groove portion 154 is completed.

[0094] [Effects of the first embodiment] The light source device 100 of this embodiment includes a light emitting element 56 that emits excitation light E, a wavelength conversion member 50 into which the excitation light E emitted from the light emitting element 56 is incident, a support member 54 having a groove 154 and supporting the wavelength conversion member 50 inside the groove 154, and a holding member 65 that holds the wavelength conversion member 50 outside the groove 154 of the support member 54. The wavelength conversion member 50 has a first surface 50a and a second surface 50b located opposite each other on the X axis along the longitudinal direction of the wavelength conversion member 50, a third surface 50c and a fourth surface 50d located opposite each other on the Y axis intersecting with the X axis, and a fifth surface 50e and a sixth surface 50f located opposite each other on the Z axis intersecting with the X axis and the Y axis. The first surface 50a of the wavelength conversion member 50 emits the fluorescence Y guided through the wavelength conversion member 50, the light emitting element 56 is provided facing the third surface 50c, and the groove portion 154 has a support surface 54s facing the fourth surface 50d, a first wall surface 54a facing the fifth surface 50e and spaced apart from the fifth surface 50e, and a second wall surface 54b facing the sixth surface 50f and spaced apart from the sixth surface 50f. The wavelength conversion member 50 has a first protrusion 151 and a second protrusion 152 whose ends on the first surface 50a side and the second surface 50b side in the X-axis direction protrude outside the groove portion 154. The first protrusion 151 and the second protrusion 152 are held by a holding member 65.

[0095] According to light source device 100 of the present embodiment, the first protrusion 151 and the second protrusion 152 of wavelength conversion member 50 are held by holding member 65 outside groove portion 154, thereby restricting the position of wavelength conversion member 50 in the X-axis direction. Therefore, wavelength conversion member 50 can be accurately disposed inside groove portion 154. Thus, a state in which fifth surface 50e of wavelength conversion member 50 is separated from first wall surface 54a of groove portion 154 and sixth surface 50f of wavelength conversion member 50 is separated from second wall surface 54b of groove portion 154 is stably maintained. Therefore, the excitation light E emitted from the light emitting element 56 is incident not only on the third surface 50c of the wavelength conversion member 50, but also on the fifth surface 50e and the sixth surface 50f. As a result, compared to a conventional light source device in which the wavelength conversion member is disposed close to one wall surface of the groove, the utilization efficiency of the excitation light E can be improved, and fluorescence Y having a desired intensity can be obtained.

[0096] Even if the side surface of the wavelength conversion member 50 can be arranged in a state separated from the wall surface of the groove portion 154, if the holding member 65 of this embodiment is not provided, it is considered that the wavelength conversion member 50 is displaced obliquely with respect to the optical axis J inside the groove portion 154 of the support member 54 as shown in FIG. 6. In this case, the traveling direction of the fluorescence Y emitted from the light source device 200 is shifted, and the fluorescence Y is incident on the optical system at the rear stage of the light source device 200 at an angle wider than expected, or in some cases, the fluorescence Y is not incident on the optical system at the rear stage of the light source device 200. Alternatively, as shown in FIG. 7, it is considered that the corner portion of the wavelength conversion member 50 rides up on the first wall surface 54a or the second wall surface 54b of the groove portion 154 of the support member 54. In this case, since the fourth surface 50d of the wavelength conversion member 50 is separated from the support surface 54s of the support member 54, the heat of the wavelength conversion member 50 is not sufficiently transmitted to the support member 54, and the wavelength conversion efficiency may be reduced.

[0097] In response to these problems, according to the light source device 100 of the present embodiment, the wavelength conversion member 50 is maintained in a state of being disposed at approximately the center of the groove portion 154 in the Z-axis direction by the holding member 65. Therefore, the traveling direction of the fluorescence Y emitted from the light source device 100 coincides with the optical axis J, so that the fluorescence Y having a desired incident angle and a desired light amount can be made to enter the optical system downstream of the light source device 100. In addition, the corners of the wavelength conversion member 50 are prevented from climbing up onto the first wall surface 54a or the second wall surface 54b of the groove portion 154. Therefore, the heat of the wavelength conversion member 50 is sufficiently transmitted to the support member 54, and the desired wavelength conversion efficiency can be maintained.

[0098] According to the light source device 100 of the present embodiment, as shown in FIG. 4, 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 fifth surface 50e of the wavelength conversion member 50 and the first portion 54a1, and then enters the second portion 54a2 inclined with respect to the support surface 54s. At this time, the excitation light E2 is reflected by the second portion 54a2 and enters the fifth surface 50e of the wavelength conversion member 50. In this way, the excitation light E2 passing through the gap between the fifth surface 50e of the wavelength conversion member 50 and the first wall surface 54a is easily entered into the fifth surface 50e, so that the amount of the excitation light E reflected by the support surface 54s and returning to the light source unit 51 can be reduced. In addition, a part of the excitation light E is reflected by the first portion 54a1 extending perpendicularly to the support surface 54s and enters the fifth surface 50e of the wavelength conversion member 50. This makes it possible to realize a light source device 100 in which the utilization efficiency of the excitation light E is high and fluorescence Y having a desired intensity can be easily obtained.

[0099] The projector 1 of this embodiment is equipped with the light source device 100 of this embodiment, and therefore has excellent light utilization efficiency.

[0100] [First Modification] A modification of this embodiment will now be described. 8 is a plan view of the light source device 110 of the first modified example as viewed from the Y-axis direction. The difference between this modified example and the above embodiment is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0101] As shown in FIG. 8, a holding member 165 in a light source device 110 of the first modified example has a first holding piece 1651, a second holding piece 1652, a first spring member 1653, and a second spring member 1654.

[0102] The second holding piece 1652 holds a part of the sixth surface 50f corresponding to the surface in the -Z direction of the first protruding portion 151 of the wavelength conversion member 50. The second holding piece 1652 is fixed to the support member 54 via a screw (not shown). The first spring member 1653 holds a part of the fifth surface 50e corresponding to the surface in the +Z direction of the first protruding portion 151 of the wavelength conversion member 50. The first spring member 1653 is, for example, a leaf spring, and presses the sixth surface 50f of the first protruding portion 151 against the second holding piece 1652 by the pressing force of the spring. Since the first spring member 1653 is displaceable in the Z-axis direction, it can contact the fifth surface 50e of the first protruding portion 151 without providing the position adjustment unit of the above embodiment. In this way, the pressing force of the first spring member 1653 can be used to hold the first protruding portion 151 of the wavelength conversion member 50 well.

[0103] The first holding piece 1651 holds a part of the fifth surface 50e corresponding to the surface in the +Z direction of the second protruding portion 152 of the wavelength conversion member 50. The first holding piece 1651 is fixed to the support member 54 via a screw (not shown). The second spring member 1654 holds a part of the sixth surface 50f corresponding to the surface in the -Z direction of the second protruding portion 152 of the wavelength conversion member 50. The second spring member 1654 is, for example, a leaf spring, and presses the fifth surface 50e of the second protruding portion 152 against the second holding piece 1652 by the pressing force of the spring. Since the second spring member 1654 is displaceable in the Z-axis direction, it can contact the sixth surface 50f of the second protruding portion 152 without providing the position adjustment unit of the above embodiment. In this way, the second protruding portion 152 of the wavelength conversion member 50 can be well held by using the pressing force of the second spring member 1654.

[0104] The holding member 165 of this modified example can hold the first protrusion 151 of the wavelength conversion member 50 between a first spring member 1653 and a second holding piece 653, and can hold the second protrusion 152 of the wavelength conversion member 50 between the second spring member 1654 and the first holding piece 652.

[0105] According to holding member 165 of this modification, by utilizing the pressing force of a spring member, first protrusion 151 and second protrusion 152 of wavelength conversion member 50 can be held with a simpler configuration than the above embodiment.

[0106] In addition, since the retaining member 165 of this modified example has a configuration in which a gap is generated around the central portion of the longitudinal direction of the groove portion 154, the position of the wavelength conversion member 50 in the Z-axis direction relative to the support member 54 inside the groove portion 154 may be regulated by providing the pressing member 90 of the above embodiment.

[0107] In the light source device 110 of this modified example, the utilization efficiency of the excitation light is improved and a desired wavelength conversion efficiency can be ensured, so that the same effects as those of the above embodiment can be obtained, such as obtaining fluorescence having a desired intensity and making it possible to cause desired fluorescence to be incident on an optical system downstream of the light source device 110. In the holding member 165 of this modified example, either the first spring member 1653 or the second spring member 1654 may be omitted.

[0108] [Second modified example] 9 is a plan view of the light source device 120 of the second modified example as viewed from the Y-axis direction. The difference between this modified example and the above embodiment is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0109] As shown in FIG. 9, a holding member 265 in a light source device 120 of the second modified example has a pair of first holding pieces 2651, 2652 and a spring member 2653. The first holding piece 2651 holds a part of the fifth surface 50e corresponding to the +Z direction surface of the first protrusion 151 of the wavelength conversion member 50. The first holding piece 2651 is fixed to the support member 54 via a screw (not shown). The first holding piece 2652 holds a part of the fifth surface 50e corresponding to the +Z direction surface of the second protrusion 152 of the wavelength conversion member 50. The first holding piece 2652 is fixed to the support member 54 via a screw (not shown). The spring member 2653 presses a part of the sixth surface 50f corresponding to the surface in the -Z direction of the first protruding portion 151 of the wavelength conversion member 50. The first spring member 1653 is formed of, for example, a leaf spring, and presses the fifth surface 50e of the first protruding portion 151 against the first holding pieces 2651, 2652 by the pressing force of the spring. Since the spring member 2653 is displaceable in the Z axis direction, it can come into contact with the sixth surface 50f of the first protruding portion 151 without providing the position adjustment portion of the above embodiment.

[0110] The holding member 265 of this modified example holds the first protrusion 151 of the wavelength conversion member 50 with the pressing force of the spring member 2653 and the first holding piece 2651, and holds the second protrusion 152 of the wavelength conversion member 50 with the pressing force of the spring member 2653 and the first holding piece 2652.

[0111] According to holding member 265 of this modification, by utilizing the pressing force of the spring member, it is possible to hold first protrusion 151 and second protrusion 152 of wavelength conversion member 50 with a simple configuration. Note that the position of spring member 2653 may be changed to press a part of sixth surface 50f corresponding to the surface of second protrusion 152 of wavelength conversion member 50 in the -Z direction.

[0112] In addition, since the retaining member 265 of this modified example has a configuration in which a gap is generated around the central portion of the longitudinal direction of the groove portion 154, the position of the wavelength conversion member 50 in the Z-axis direction relative to the support member 54 inside the groove portion 154 may be regulated by providing the pressing member 90 of the above embodiment.

[0113] In the light source device 120 of this modified example, the utilization efficiency of the excitation light is improved and a desired wavelength conversion efficiency can be ensured, so that the same effects as those of the above embodiment can be obtained, such as obtaining fluorescence having a desired intensity and making it possible to cause desired fluorescence to be incident on an optical system downstream of the light source device 120.

[0114] [Third Modification] 10 is a plan view of a light source device 130 of a third modified example as viewed from the Y-axis direction. The difference between this modified example and the second modified example is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0115] As shown in Fig. 10, the holding member 365 in the light source device 130 of the third modification has one holding piece 3650 and a spring member 2653. The holding piece 3650 of this modification is configured by integrally forming the first holding pieces 2651 and 2652 of the second modification. The holding piece 3650 of this modification has a main body 3650a extending along the longitudinal direction of the wavelength conversion member 50, a first convex portion 3650b provided to protrude in the -Z direction from the end of the main body 3650a in the +X direction and to hold a part of the fifth surface 50e of the first protrusion 151, and a second convex portion 3650c provided to protrude in the -Z direction from the end of the main body 3650a in the -X direction and to hold a part of the fifth surface 50e of the second protrusion 152.

[0116] The holding member 365 of this modified example holds the first protrusion 151 of the wavelength conversion member 50 with the pressing force of the spring member 2653 and the first convex portion 3650b of the holding piece 3650, and holds the second protrusion 152 of the wavelength conversion member 50 with the pressing force of the spring member 2653 and the second convex portion 3650c of the holding piece 3650.

[0117] According to the holding member 365 of this modification, it is possible to hold the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 with a simple configuration by using the pressing force of the spring member 2653 and the holding piece 3650. Note that the position of the spring member 2653 may be changed to press a part of the sixth surface 50f corresponding to the surface of the second protrusion 152 of the wavelength conversion member 50 in the -Z direction. In the holding member 365 of this modification, the first holding pieces 2651, 2652 of the second modification can be handled as an integrated member, and therefore the assembly work of the light source device 130 becomes easier.

[0118] In the light source device 130 of this modified example, the utilization efficiency of the excitation light is improved and a desired wavelength conversion efficiency can be ensured, so that the same effects as those of the above embodiment can be obtained, such as obtaining fluorescence having a desired intensity and making it possible to cause desired fluorescence to be incident on the optical system downstream of the light source device 120.

[0119] [Fourth Variation] 11 is a plan view of a light source device 140 of a fourth modified example as viewed from the Y-axis direction. The difference between this modified example and the above embodiment is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are given the same reference numerals and descriptions thereof will be omitted.

[0120] As shown in FIG. 11, a holding member 465 in a light source device 140 of the fourth modified example has a first holding piece 4651 and a pair of second holding pieces 4652 and 4653. The first holding piece 4651 holds a part of the fifth surface 50e corresponding to the +Z direction surface of the second protruding portion 152 of the wavelength conversion member 50. The first holding piece 4651 is fixed to the support member 54 via a screw (not shown) so as to apply a predetermined pressing force to the fifth surface 50e of the second protruding portion 152.

[0121] One of the second holding pieces 4652 holds a part of the sixth surface 50f corresponding to the -Z direction surface of the first protruding portion 151 of the wavelength conversion member 50. The second holding piece 4652 is fixed to the support member 54 via a screw (not shown) so as to apply a predetermined pressing force to the sixth surface 50f of the first protruding portion 151.

[0122] The other second holding piece 4653 holds a part of the sixth surface 50f corresponding to the -Z direction surface of the second protruding portion 152 of the wavelength conversion member 50. The second holding piece 4653 is fixed to the support member 54 via a screw (not shown) so as to apply a predetermined pressing force to the sixth surface 50f of the second protruding portion 152.

[0123] In this modification, the holding position of the fifth surface 50e of the second protrusion 152 by the first holding piece 4651 and the holding position of the sixth surface 50f of the second protrusion 152 by the second holding piece 4653 are shifted in the X-axis direction. Specifically, the holding position by the first holding piece 4651 is located on the +X side of the holding position by the second holding piece 4653. That is, the holding member 465 of this modification is configured to hold three points in the longitudinal direction of the wavelength conversion member 50.

[0124] In addition, since the retaining member 465 of this modified example has a configuration in which a gap is generated around the central portion of the longitudinal direction of the groove portion 154, the position of the wavelength conversion member 50 in the Z-axis direction relative to the support member 54 inside the groove portion 154 may be regulated by providing the pressing member 90 of the above embodiment.

[0125] According to the holding member 465 of this modified example, by shifting the holding surface of the wavelength conversion member 50 to three positions in the longitudinal direction, the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 can be held by three holding pieces 4651, 4652, 4653, which is fewer than the configuration of the above embodiment.

[0126] In the light source device 140 of this modified example, the utilization efficiency of the excitation light is improved and a desired wavelength conversion efficiency can be ensured, so that the same effects as those of the above embodiment can be obtained, such as obtaining fluorescence having a desired intensity and making it possible to cause desired fluorescence to be incident on an optical system downstream of the light source device 140.

[0127] 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. In addition, one aspect of the present invention can be a configuration in which the characteristics of the above-described embodiment and the modified examples are appropriately combined.

[0128] In the above embodiment and modified example, the holding piece abutting against the side surface of the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 applies force only in the Z-axis direction, but the configuration of the holding piece is not limited to this. The holding piece may be configured to simultaneously apply a pressing force in the -X direction to press the wavelength conversion member 50 against the support surface 54s of the groove portion 154, in addition to the Z-axis direction. Hereinafter, the configuration of the holding piece capable of applying the above-mentioned pressing force in the Z-axis direction and the -X direction will be described with reference to Figs. 12A, 12B, and 12C. Note that Figs. 12A, 12B, and 12C show an example of a holding piece that holds the fifth surface 50e side of the second protrusion 152 of the wavelength conversion member 50, but the holding piece that holds the sixth surface 50f side of the second protrusion 152 and the first protrusion 151, or the spring member of the modified example can also be applied.

[0129] 12A has a holding surface 5651 that holds a corner 50R of the second protrusion 152 of the wavelength conversion member 50. The corner 50R is a portion where the fifth surface 50e and the third surface 50c intersect. The holding surface 5651 of the holding piece 5650 presses the corner 50R from an obliquely upper side to an obliquely lower side with respect to the support surface 54s, that is, in the -Z direction and the +Y direction. Therefore, the holding surface 5651 holds the second protrusion 152 in the -Z direction and generates a force pressing the second protrusion 152 against the support surface 54s. According to the holding piece 5650 having such a holding surface 5651, the wavelength conversion member 50 can be held in a more stable state.

[0130] When an external force or the like is applied, corner portion 50R of wavelength conversion member 50 rubs against holding surface 5651, which may cause chipping of corner portion 50R. In response to this, as shown in Fig. 12B, by providing cushioning material 5653 between holding surface 5651 and corner portion 50R, chipping of corner portion 50R can be prevented.

[0131] 12C includes a first contact portion 6651, a second contact portion 6652, and a main body portion 6653. The main body portion 6653 has a rectangular cross-sectional shape and is formed integrally with the first contact portion 6651 and the second contact portion 6652. The first contact portion 6651 extends from the main body portion 6653 in the -Z direction, and its tip portion abuts against the fifth surface 50e of the second protruding portion 152 of the wavelength conversion member 50. The second contact portion 6652 extends from the main body portion 6653 in the -Z direction, and its tip portion is bent toward the -Y side and abuts against the third surface 50c of the second protruding portion 152 of the wavelength conversion member 50. The tips of the first contact portion 6651 and the second contact portion 6652 are each chamfered. The holding piece 6650 holds the second protruding portion 152 in the -Z direction by the first contact portion 6651, and generates a force by the second contact portion 6652 to press the second protruding portion 152 against the support surface 54s. Such a holding piece 6650 can more stably hold the wavelength conversion member 50. Furthermore, since it does not come into contact with the corners 50R of the wavelength conversion member 50, chipping of the corners 50R can be suppressed.

[0132] In the light source device 100 of the above embodiment, the wavelength conversion member 50 has protrusions on both the first surface 50a side and the second surface 50b in the X-axis direction, but a protrusion may be provided on only one of the first surface 50a side and the second surface 50b in the X-axis direction. In this case, a holding member is disposed only on the side on which the protrusion is provided.

[0133] In the light source device 100 of the above embodiment, the interval L1 is set to be narrower than the first width D2 and equal to the second width B2, but the interval L1 may be set to be narrower than the first width D2 and wider than the second width B2. When the interval L1 is set wider than the second width B2, a slight play can be provided between the holding member 65 and the wavelength conversion member 50, so that it is possible to prevent problems such as deformation or damage of the wavelength conversion member 50 caused by stress being applied to the contact portion between the holding member 65 and the wavelength conversion member 50. If the interval L1 is narrower than the first width D2 of the support surface 54s of the groove portion 154, the wavelength conversion member 50 will not come into contact with the wall surface of the groove portion 154.

[0134] In the above embodiment, each wall surface of the groove of the support member has a portion perpendicular to the support surface and a portion inclined to the support surface, but the shape of the groove is not particularly limited, and for example, the entire wall surface of the groove may be perpendicular to the support surface. Also, the wall surface of the groove may be curved.

[0135] In the above embodiment, an example has been given in which angle conversion member 52 is separately provided on first surface 50a, which is the light exit surface of wavelength conversion member 50, but it is not necessary to provide angle conversion member 52. In this case, a truncated quadrangular pyramid-shaped exit portion whose cross-sectional area perpendicular to the optical axis expands along the light traveling direction may be formed integrally on the light exit side of the wavelength conversion member.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] The following is a summary of this disclosure. (Appendix 1) A light emitting element that emits light; a light guiding member into which the light emitted from the light emitting element is incident; a support member having a groove portion and supporting the light guide member inside the groove portion; a holding member that holds the light guiding member outside the groove of the support member; Equipped with the light guiding member has a first surface and a second surface located opposite to each other along a first axis along a longitudinal direction of the light guiding member, a third surface and a fourth surface located opposite to each other along a second axis intersecting the first axis, and a fifth surface and a sixth surface located opposite to each other along a third axis intersecting the first axis and the second axis; the first surface of the light guiding member emits light that has been guided through the light guiding member; The light emitting element is provided facing the third surface, the groove portion has a support surface facing the fourth surface, a first wall surface facing the fifth surface and spaced apart from the fifth surface, and a second wall surface facing the sixth surface and spaced apart from the sixth surface, The light guide member has a protruding portion, at least one of both ends on the first axis protruding outside the groove, and the protruding portion is held by the holding member.

[0140] According to the light source device having this configuration, the protruding portion of the light guide member is held by the holding member outside the groove portion, thereby restricting the position of the light guide member in the third axis direction. Therefore, the light guide member can be accurately positioned inside the groove portion. Therefore, the fifth surface of the light guide member is spaced apart from the first wall surface of the groove portion, and the sixth surface of the wavelength conversion member is spaced apart from the second wall surface of the groove portion. Therefore, the light emitted from the light emitting element is incident not only on the third surface of the light guiding member but also on the fifth and sixth surfaces. As a result, the light utilization efficiency can be improved compared to a conventional light source device in which the light guiding member is disposed close to one wall surface of the groove, and light having a desired intensity can be obtained.

[0141] (Appendix 2) the light guide member has a first protrusion including the first surface, 2. The light source device according to claim 1, wherein the first surface of the first protrusion is provided with an angle conversion member that converts an angular distribution of the light emitted from the first surface.

[0142] According to this configuration, the vicinity of the first surface of the first protrusion on which the angle conversion member is provided is held by the holding member. This makes it possible to reduce impacts due to external forces or the like on the fixed portion between the angle conversion member and the first surface. This makes it possible to provide a light source device with excellent impact resistance by increasing the strength of the fixed portion between the angle conversion member and the first surface.

[0143] (Appendix 3) the light guiding member has a second protrusion including the second surface, 3. The light source device according to claim 2, wherein the second surface of the second protrusion is provided with a mirror that reflects light guided inside the light-guiding member.

[0144] According to this configuration, the vicinity of the second surface of the second protrusion on which the mirror is provided is held, and therefore, by holding both ends of the light guiding member in the longitudinal direction, it is possible to reduce vibration of the light guiding member caused by impact due to an external force or the like.

[0145] (Appendix 4) The light source device described in any one of Appendix 1 to Appendix 3, wherein the holding member has a first holding piece that holds the fifth surface side of the protrusion and a second holding piece that holds the sixth surface side of the protrusion.

[0146] According to this configuration, the fifth surface side and the sixth surface side of the protruding portion can be held from both sides, and therefore the light guide member can be held well in the direction along the third axis.

[0147] (Appendix 5) A light source device as described in Appendix 4, wherein a distance along the third axis between a first retaining surface of the first retaining piece and a second retaining surface of the second retaining piece is narrower than a first width along the third axis of the support surface of the groove portion and is equal to or wider than a second width along the third axis of the protrusion portion.

[0148] According to this configuration, the wavelength conversion member, whose protrusion is held by the first holding piece and the second holding piece, has the fifth surface separated from the first wall surface of the groove and the sixth surface separated from the second wall surface of the groove. When the distance between the first holding surface and the second holding surface is equal to the second width, the position of the wavelength conversion member in the third axial direction can be fixed. When the distance between the first holding surface and the second holding surface is wider than the second width, a slight play can be provided between the holding member and the light guiding member, so that deformation or damage of the light guiding member due to stress applied to the contact portion between the holding member and the light guiding member can be prevented.

[0149] (Appendix 6) The light source device described in Appendix 5, wherein the holding member further has a position adjustment portion that enables adjustment of the position of at least one of the first holding piece and the second holding piece in a direction along the third axis.

[0150] According to this configuration, the position of at least one of the first and second holding pieces in the third axial direction can be adjusted, thereby realizing a configuration in which the distance between the first holding surface of the first holding piece and the second holding surface of the second holding piece is set narrower than the first width of the groove and equal to or wider than the second width of the protrusion.

[0151] (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 extends in a direction perpendicular to the support surface, and the second portion is inclined 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 extends in a direction perpendicular to the support surface, and the fourth portion is inclined so as to approach the sixth surface from the third portion side toward the support surface side, 7. The light source device according to claim 1, wherein the first portion, the second portion, the third portion, and the fourth portion reflect at least a portion of the light emitted from the light-emitting element.

[0152] According to this configuration, a portion of the light emitted from the light-emitting element travels through the gap between the fifth 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 fifth surface of the light-guiding member. In this way, the light passing through the gap between the fifth surface of the light-guiding member and the first wall surface is more likely to enter the fifth surface, so that the amount of light reflected by the support surface and returning to the light-emitting element can be reduced. In addition, a portion of the light is reflected by the first portion extending perpendicularly to the support surface and enters the fifth surface of the light-guiding member. This makes it possible to realize a light source device that has high light utilization efficiency and is easy to obtain light with a desired intensity.

[0153] (Appendix 8) 8. The light source device according to claim 1, wherein a surface of the protrusion facing the holding member is aligned along the first axis.

[0154] According to this configuration, when the holding surface of the protrusion by the holding member is aligned along the first axis, the holding portion can make better contact with the protrusion than when the holding surface is inclined with respect to the first axis, and therefore the holding member can stably hold the protrusion.

[0155] (Appendix 9) the light emitting element emits a first light having a first wavelength band; 9. The light source device according to claim 1, wherein the light-guiding 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.

[0156] According to this configuration, it is possible to realize a light source device that has high utilization efficiency of the first light and obtains the second light having a desired intensity.

[0157] (Appendix 10) A light source device according to any one of claims 1 to 9, 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; A projector equipped with

[0158] 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]

[0159] 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, 52...angle conversion member, 53...mirror, 54...support member, 54a...first wall surface, 54b...second wall surface, 54s...support surface, 56...light emitting element, 65,165,265,365,465...holding member, 100,110,120,130,140,200...light source device, 151...first 1 protrusion, 152...second protrusion, 154...groove, 54a1...first part, 54a2...second part, 54b3...third part, 54b4...fourth part, 651,652,1651,2651,2652,4651...first holding piece, 653,654,1652 ,4652,4653...second holding piece, 655...position adjustment unit, 6511,6521...first holding surface, 6531,6541...second holding surface, B2...second width, B2...width, D2...first width, L1...interval, E, E2...excitation light (first light), Y...fluorescence (second light).

Claims

1. A light emitting element that emits light; a light guiding member into which the light emitted from the light emitting element is incident; a support member having a groove portion and supporting the light guide member inside the groove portion; a holding member that holds the light guiding member outside the groove of the support member; Equipped with the light guiding member has a first surface and a second surface located opposite to each other along a first axis along a longitudinal direction of the light guiding member, a third surface and a fourth surface located opposite to each other along a second axis intersecting the first axis, and a fifth surface and a sixth surface located opposite to each other along a third axis intersecting the first axis and the second axis, The first surface of the light guiding member emits light that has been guided through the light guiding member, The light emitting element is provided facing the third surface, the groove portion has a support surface facing the fourth surface, a first wall surface facing the fifth surface and spaced apart from the fifth surface, and a second wall surface facing the sixth surface and spaced apart from the sixth surface, A light source device, wherein the light guiding member has a protrusion, at least one of both ends on the first axis protruding outside the groove, and the protrusion is held by the holding member.

2. the light guide member has a first protrusion including the first surface, The light source device according to claim 1 , wherein the first surface of the first protrusion is provided with an angle conversion member that converts an angular distribution of the light emitted from the first surface.

3. the light guide member has a second protrusion including the second surface, The light source device according to claim 2 , wherein the second surface of the second protrusion is provided with a mirror that reflects the light guided inside the light guide member.

4. The light source device according to claim 1 , wherein the holding member has a first holding piece that holds the fifth surface side of the protrusion, and a second holding piece that holds the sixth surface side of the protrusion.

5. 5. The light source device of claim 4, wherein the distance along the third axis between the first retaining surface of the first retaining piece and the second retaining surface of the second retaining piece is narrower than a first width along the third axis of the support surface of the groove portion, and is equal to or wider than a second width along the third axis of the protrusion portion.

6. The light source device according to claim 5 , wherein the holding member further comprises a position adjustment portion that enables adjustment of a position of at least one of the first holding piece and the second holding piece in a direction along the third axis.

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 extends in a direction perpendicular to the support surface, and the second portion is inclined 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 extends in a direction perpendicular to the support surface, and the fourth portion is inclined so as to approach the sixth surface from the third portion side toward the support surface side, The light source device according to claim 1 , wherein the first portion, the second portion, the third portion, and the fourth portion reflect at least a portion of the light emitted from the light emitting element.

8. The light source device according to claim 1 , wherein a surface of the protrusion facing the holding member is aligned along the first axis.

9. the light-emitting element emits a first light having a first wavelength band; 4. The light source device according to claim 1, wherein the light-guiding member is a wavelength conversion member that contains 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 3, 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; A projector equipped with

Images