Light source device and projector

Abstract

To provide a light source device that outputs light with less loss.SOLUTION: A light source device of the present invention comprises: a light emitting device; a light guide member; an angle conversion member; a support member having a support surface supporting the light guide member; and a holding member holding the angle conversion member. The light guide member has a first surface and a second surface located on the opposite sides to each other in a longitudinal direction of the light guide member, and a side face in contact with the first surface and the second surface. The angle conversion member has an incident end face and an emission end face. Light guided by the light guide member is emitted from the first surface toward the incident end face, and light emitted from the light emitting device is incident on the light guide member from the side face. The holding member has a holding part holding the angle conversion member while being fixed to the angle conversion member. The holding part holds the angle conversion member in a direction intersecting the support surface, and can be displaced in the longitudinal direction relative to the support member.SELECTED DRAWING: Figure 8

Description

[Technical field]

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

[0002] 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. The following Patent Document 1 discloses a light source device that includes a solid-state light source, a light guide that converts the wavelength of the light emitted from the solid-state light source, a collimator optically coupled to the light guide, and an optical interface plate that houses a part of the collimator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 078790 Summary of the Invention [Problem to be solved by the invention]

[0004] In the light source device of Patent Document 1, a part of the collimator is housed in the optical interface plate, and the movement of the collimator in a direction perpendicular to the optical interface plate is restricted. However, if the movement of the collimator in the longitudinal direction of the light guide is restricted, for example, when the light guide is thermally expanded due to a temperature rise, shear stress is generated at the joint surface between the light guide and the collimator, and the collimator may peel off from the light guide. If the collimator peels off from the light guide, there is a problem that the desired light output cannot be obtained as a light source device.

[0005] Although the above description has been given taking a light source device with wavelength conversion as an example, a light source device without wavelength conversion has the same problem. It is desired to provide a light source device that can emit light with a desired intensity with little loss of output light. [Means for solving the problem]

[0006] In order to solve the above problem, a light source device according to one aspect of the present invention includes a light emitting element that emits light, a light guiding member that guides the light emitted from the light emitting element, an angle conversion member that converts the angular distribution of the light emitted from the light guiding member, a support member having a support surface that supports the light guiding member, and a holding member that holds the angle conversion member. The light guiding member has a first surface and a second surface that are located opposite to each other in the longitudinal direction of the light guiding member, and a side surface that contacts each of the first surface and the second surface. The angle conversion member has an incident end surface into which the light emitted from the light guiding member is incident, and an exit end surface that exits the light incident from the incident end surface. The light that is guided through the light guiding member is emitted from the first surface toward the incident end surface, and the light emitted from the light emitting element is incident on the light guiding member from the side surface. The holding member has a holding portion that holds the angle conversion member in a state where it is fixed to the angle conversion member. The holding portion holds the angle conversion member in a direction intersecting the support surface, and is displaceable in the longitudinal direction relative to the support member.

[0007] 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]

[0008] [Figure 1] FIG. 1 is a schematic configuration diagram of a projector according to a first embodiment. [Diagram 2] FIG. 2 is a schematic configuration diagram of a first illumination device according to the first embodiment. [Diagram 3] FIG. 1 is a perspective view of a light source device according to a first embodiment. [Figure 4] FIG. 2 is a plan view of the light source device. [Diagram 5] 4 is a cross-sectional view of the light source device taken along line VV in FIG. [Figure 6] FIG. 4 is an enlarged perspective view of the vicinity of the holding member. [Figure 7] FIG. 4 is an enlarged side view of the vicinity of the holding member. [Figure 8] FIG. 4 is a perspective view showing an attachment structure of a holding member. [Figure 9] 13 is an enlarged perspective view of the vicinity of a holding member in a light source device according to a second embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

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

[0013] In the following, in the drawings, an XYZ orthogonal 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, and is an axis along the front-rear direction of the projector 1. The Y axis is an axis perpendicular to the X axis and the Z axis, and is an axis along the left-right direction of the projector 1. These notations are for explaining the arrangement relationship of each component of the projector 1, and do not limit the installation posture or direction of the projector 1. 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.

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

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

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

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

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

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

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

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

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

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

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

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

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

[0027] The configuration of the first illumination device 20 will be described below. FIG. 2 is a schematic diagram showing a schematic configuration 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 30, a collimating optical system 63, an integrator optical system 31, a polarization conversion element 32, and a superimposing optical system 33.

[0028] Fig. 3 is a perspective view showing a schematic configuration of light source device 30. Fig. 4 is a plan view of light source device 30. Fig. 5 is a cross-sectional view of light source device 30 taken along line VV in Fig. 3. Note that in Figs. 3 to 5, illustration of holding member 45 is omitted for ease of viewing the drawings.

[0029] As shown in Figures 3 to 5, the light source device 30 includes a wavelength conversion member 50, a light source section 51, an angle conversion member 52, a support member 54, a position regulating member 65, a first pressing member 90, a mirror 53, a second pressing member 58, and a holding member 45 (see Figures 6 to 8).

[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 direction in which the X-axis extends corresponds to the longitudinal direction of the wavelength conversion member 50. The length of the side extending along the Y-axis is equal to the length of the side extending along the Z-axis. That is, the cross-sectional shape of the wavelength conversion member 50 cut along a plane along the YZ plane perpendicular to the X-axis is a square. Note that the cross-sectional shape of the wavelength conversion member 50 cut along a plane along the YZ plane may be a rectangle. As an example of the size of the wavelength conversion member 50, the sides extending along the Y-axis and Z-axis have a length of 1 mm, and the side extending along the X-axis has a length of 50 mm.

[0031] The wavelength conversion member 50 has a first surface 50a, a second surface 50b, a third surface 50c, a fourth surface 50d, a fifth surface 50e, and a sixth surface 50f. The first surface 50a and the second surface 50b are perpendicular to the X-axis along the longitudinal direction of the wavelength conversion member 50 and are located on opposite sides of the X-axis. In this embodiment, the first surface 50a is located on one side in the X-axis direction, that is, the +X side, and the second surface 50b is located on the opposite side in the X-axis direction, that is, the -X side.

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

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

[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 distinguished from each other, they may be simply referred to as side surfaces 50c, 50d, 50e, and 50f. The side surfaces 50c, 50d, 50e, and 50f in this embodiment correspond to the side surfaces in the claims.

[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 wavelength band of the fluorescence Y is, for example, a yellow wavelength band of 490 to 750 nm. That is, the fluorescence Y is yellow fluorescence containing a red light component and a green light component. The wavelength conversion member 50 may contain a single crystal phosphor instead of the 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 this type of material converts the excitation light E into the fluorescence Y.

[0037] 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.

[0038] The light source unit 51 has a substrate 55, a plurality of light-emitting elements 56, and wiring (not shown). The light source unit 51 may also have other optical members such as a light guide plate, a diffusion plate, and a lens. The plurality of light-emitting elements 56 are provided on one surface of the substrate 55. The light source unit 51 of this embodiment has a plurality of light-emitting elements 56, but the number of the light-emitting elements 56 is not particularly limited.

[0039] The light emitting element 56 has a light emitting surface 56a and emits excitation light E of a first wavelength band from the light emitting surface 56a. The light emitting element 56 is, for example, a light emitting diode (LED). The light emitting element 56 is disposed facing 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 the third surface 50c, which is one of the four side surfaces 50c, 50d, 50e, and 50f along the longitudinal direction of the wavelength conversion member 50.

[0040] The support member 54 has a groove 154 that supports the wavelength conversion member 50. The support member 54 supports the wavelength conversion member 50 inside the groove 154, thereby diffusing and releasing heat generated in the wavelength conversion member 50 to the outside. For this reason, it is desirable that the support member 54 is made of a material that has a predetermined strength and high thermal conductivity. As a material for the support member 54, for example, a metal such as aluminum, iron, or stainless steel is used, and in particular, it is desirable to use an aluminum alloy such as 6061 series. A specific configuration of the support member 54 will be described later.

[0041] The position restricting member 65, together with a first pressing member 90 described later, restricts the position of the wavelength conversion member 50 relative to the support member 54. As shown in FIG. 4, the position restricting member 65 restricts the movement of the wavelength conversion member 50 to the +Z side and the -Z side along the Z-axis direction. The position restricting member 65 is made of a pair of members and is accommodated in a first accommodation groove portion 541 provided on both sides of the groove portion 154 of the support member 54. The position restricting member 65 is fixed to the support member 54 by a screw 97. In this embodiment, the pair of position restricting members 65 are provided at two locations, one on the side close to the first surface 50a of the wavelength conversion member 50 and the other on the side close to the second surface 50b, but the number and installation positions of the position restricting members 65 are not limited.

[0042] As shown in FIG. 5, the first pressing member 90 restricts the movement of the wavelength conversion member 50 in the Y-axis direction relative to the support member 54 inside the groove portion 154. The first pressing member 90 is disposed facing the support surface 54s of the groove portion 154. As a result, the first pressing member 90 restricts the wavelength conversion member 50 from moving to the -Y side inside the groove portion 154, and presses the wavelength conversion member 50 toward the support surface 54s. The first pressing member 90 is made of a material capable of elastic deformation. Specifically, the first pressing member 90 is made of a leaf spring made of a stainless steel material such as SUS304. As shown in FIG. 4, the first pressing member 90 is accommodated in a second accommodation groove portion 542 provided in the support member 54.

[0043] In this embodiment, two first pressing members 90 are used, but the number of first pressing members 90 is not particularly limited. It is desirable that each of the two first pressing members 90 is disposed at a position that does not overlap with the light emitting element 56 of the light source unit 51. With this configuration, the excitation light E emitted from the light emitting element 56 is not blocked by the first pressing members 90. Each of the two first pressing members 90 presses the wavelength conversion member 50 against the support surface 54s of the support member 54 at each installation position. The first pressing members 90 are fixed to the support member 54 by screws 96.

[0044] 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 configured separately from the wavelength conversion member 50 and is provided in contact with the second surface 50b of the wavelength conversion member 50. The mirror 53 has a reflection surface 53r in which a metal film or a dielectric multilayer film is formed on one surface of a plate made of metal or the like. The mirror 53 may be made of a metal film or a dielectric multilayer film formed directly on the second surface 50b of the wavelength conversion member 50. The mirror 53 in this embodiment corresponds to a reflection member in the claims.

[0045] The second pressing member 58 presses the mirror 53 from the outer surface 53t side toward the second surface 50b of the wavelength conversion member 50. As a result, the reflecting surface 53r of the mirror 53 is in close contact with the second surface 50b of the wavelength conversion member 50. As shown in FIG. 3, the second pressing member 58 has a pressing portion 581 and an elastic portion 582. The second pressing member 58 is made of a plate-shaped metal material having elasticity, and the pressing portion 581 and the elastic portion 582 are integrally formed. With this configuration, the pressing portion 581 can reliably press the mirror 53, and the elastic portion 582 can apply a pressing force to the pressing portion 581. The pressing portion 581 abuts against the outer surface 53t of the mirror 53 and presses the mirror 53.

[0046] In the light source device 30, 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, and 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. In the case of this embodiment, the fluorescence Y traveling toward the first surface 50a is emitted from the first surface 50a and enters the angle conversion member 52 provided on the first surface 50a. The fluorescence Y traveling toward the second surface 50b is reflected by the mirror 53 and then travels toward the first surface 50a.

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

[0048] 4, support member 54 is a plate-like member having a rectangular planar shape and including groove portion 154, a first accommodating groove portion 541, a second accommodating groove portion 542, and an accommodating recess 545. Groove portion 154 extends in the X-axis direction along the longitudinal direction of wavelength conversion member 50, and accommodates wavelength conversion member 50.

[0049] 5, the groove 154 has a cross section perpendicular to the X-axis direction that is substantially U-shaped. The groove 154 has a support surface 54s, a first wall surface 54a, and a second wall surface 54b. The groove 154 is formed by cutting the material of the support member 54, which is a metal such as aluminum, iron, or stainless steel.

[0050] The support surface 54s corresponds to the bottom surface of the groove portion 154. In the case of this embodiment, the support surface 54s is a surface extending parallel to the XZ plane, abuts against the fourth surface 50d of the wavelength conversion member 50, and supports the fourth surface 50d. The first wall surface 54a corresponds to one side surface of the groove portion 154. The first wall surface 54a faces the fifth surface 50e of the wavelength conversion member 50 and is spaced from the fifth surface 50e. That is, a gap is provided between the first wall surface 54a and the fifth surface 50e of the wavelength conversion member 50. The second wall surface 54b corresponds to the other side surface of the groove portion 154. The second wall surface 54b faces the sixth surface 50f of the wavelength conversion member 50 and is spaced from the sixth surface 50f. That is, a gap is provided between the second wall surface 54b and the sixth surface 50f of the wavelength conversion member 50.

[0051] The first wall surface 54a has a first portion 54a1 located on the side farther from the support surface 54s and a second portion 54a2 located on the side closer to the support surface 54s. 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 is inclined 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 side closer to the support surface 54s and the fifth surface 50e is smaller than the distance between the second portion 54a2 on the side closer to the support surface 54s and the fifth surface 50e on the side closer to the first portion 54a1.

[0052] The second wall surface 54b has a third portion 54b3 located on the side farther from the support surface 54s and a fourth portion 54b4 located on the side closer to the support surface 54s. 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 on the side closer to the support surface 54s and the sixth surface 50f is smaller than the distance between the fourth portion 54b4 on the side closer to the third portion 54b3 and the sixth surface 50f.

[0053] Each of the first wall surface 54a and the second wall surface 54b is made of a surface of a metal such as aluminum, iron, 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. As a result, 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 the surface of a metal such as aluminum, iron, or stainless steel.

[0054] The first wall surface 54a and the second wall surface 54b of the groove portion 154 need to be mirror-finished as described above. Therefore, the portion where the groove portion 154 is provided is required to have higher processing accuracy than other portions of the support member 54. For this reason, the portion of the support member 54 where the groove portion 154 is provided may be made of a different member, and one support member 54 may be constructed by combining with another member that forms the portion other than the groove portion 154. In other words, the support member 54 may be constructed by combining a plurality of members. In this way, since the peripheral portion of the groove portion 154 is formed of a different member, the workability and processing accuracy of the first wall surface 54a and the second wall surface 54b of the groove portion 154 can be easily improved.

[0055] The dimension W1 of the light-emitting surface 56a of the light-emitting element 56 along the Z-axis direction is larger than the width B2 of the wavelength conversion member 50 along the Z-axis direction. The width of the wavelength conversion member 50 in this embodiment in the Z-axis direction is equal throughout the longitudinal direction. As a result, 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 in the Z-axis direction. 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.

[0056] The 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.

[0057] 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 and the first portion 54a1 of the wavelength conversion member 50, and then enters the second portion 54a2 inclined with respect to the support surface 54s. At this time, the excitation light E2 is reflected by the second portion 54a2 and enters the 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 and the first wall surface 54a of the wavelength conversion member 50 is more likely to enter the fifth surface 50e, so that the amount of the excitation light E reflected by the support surface 54s and returning to the side of the light source unit 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. The same applies to the excitation light E2 entering the gap between the sixth surface 50f and the second wall surface 54b of the wavelength conversion member 50. This makes it possible to realize a light source device 30 that has high utilization efficiency of the excitation light E and that makes it easy to obtain fluorescence Y having a desired intensity.

[0058] 4, the first accommodating groove 541 is provided on the upper surface of the supporting member 54, and is a groove recessed into the upper surface of the supporting member 54. The first accommodating groove 541 is provided on both sides in the Z-axis direction of the groove 154. The first accommodating groove 541 accommodates a position restricting member 65 that restricts the position of the wavelength conversion member 50 in the Z-axis direction.

[0059] The second accommodating groove 542 is provided on the upper surface of the supporting member 54, and is a groove recessed into the upper surface of the supporting member 54. The second accommodating groove 542 is provided on both sides in the Z-axis direction of the groove 154. The second accommodating groove 542 accommodates the first pressing member 90 that presses the wavelength conversion member 50 toward the supporting surface 54s of the supporting member 54.

[0060] 3, the accommodating recess 545 is provided on the upper surface of the supporting member 54, and is a recess that is recessed with respect to the upper surface of the supporting member 54. The accommodating recess 545 is provided on the +X side of the groove portion 154, i.e., the side where the first surface 50a of the wavelength converting member 50 is located. The accommodating recess 545 accommodates the angle converting member 52 joined to the wavelength converting member 50.

[0061] The angle conversion member 52 is provided on the first surface 50a of the wavelength conversion member 50. The angle conversion member 52 is made of a compound parabolic concentrator (CPC). The angle conversion member 52 is made of a light-transmitting material such as borosilicate glass such as N-BK7, or a cycloolefin resin such as E-48R.

[0062] The angle conversion member 52 has an incident end face 52a on which the fluorescence Y emitted from the first surface 50a of the wavelength conversion member 50 is incident, an exit end face 52b from which the fluorescence Y incident from the incident end face 52a is emitted, and four side faces 52c in contact with each of the incident end face 52a and the exit end face 52b. Each of the four side faces 52c functions as a reflecting surface that reflects the fluorescence Y incident from the incident end face 52a toward the exit end face 52b. Hereinafter, the side faces 52c may also be referred to as reflecting surfaces 52c.

[0063] The cross-sectional area of ​​the angle conversion member 52 perpendicular to the optical axis J gradually increases from the incident end face 52a toward the exit end face 52b. Therefore, the area of ​​the exit end face 52b is larger than the area of ​​the incident end face 52a. Furthermore, the width of each reflecting surface 52c in a direction perpendicular to the optical axis J gradually increases from the incident end face 52a toward the exit end face 52b. When the angle conversion member 52 is viewed from a direction perpendicular to the optical axis J (the Z-axis direction), the shape of each reflecting surface is parabolic.

[0064] An axis that passes through the centers of emission end face 52b and incidence end face 52a and is parallel to the X-axis is defined as optical axis J of angle conversion member 52. Optical axis J of angle conversion member 52 coincides with optical axis AX1 of first illumination device 20. Hereinafter, of angle conversion member 52, a portion that includes incidence end face 52a and emission end face 52b and that substantially contributes to the angle conversion of fluorescence Y is referred to as angle conversion member main body 521, and a portion that protrudes outward from emission end face 52b with respect to optical axis J is referred to as flange portion 522.

[0065] 2, the fluorescence Y incident on the angle conversion member 52 changes direction each time it is totally reflected by the reflecting 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 second surface 50b of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum emission angle of the fluorescence Y at the emission end surface 52b smaller than the maximum incidence angle of the fluorescence Y at the incidence end surface 52a.

[0066] Generally, the etendue of light, which is defined as the product of the area of ​​the light emission region and the solid angle (maximum emission 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 emission end face 52b is larger than the area of ​​the incidence end face 52a. Therefore, from the viewpoint of etendue preservation, the angle conversion member 52 can make the maximum emission angle of the fluorescence Y at the emission end face 52b smaller than the maximum incidence angle of the fluorescence Y incident on the incidence end face 52a.

[0067] As shown in FIG. 4, the wavelength conversion member 50 and the angle conversion member 52 are bonded together by a bonding layer 41. The bonding layer 41 is made of an adhesive and is provided between the first surface 50a of the wavelength conversion member 50 and the incident end surface 52a of the angle conversion member 52. It is preferable that the bonding layer 41 is provided in the entire area between the first surface 50a and the incident end surface 52a. In this case, no gap (air layer) exists between the wavelength conversion member 50 and the angle conversion member 52. The bonding layer 41 has optical transparency. As a material for the bonding layer 41, for example, a phenyl-based silicone resin adhesive having thermosetting or ultraviolet curing properties is used.

[0068] If a gap is provided between the wavelength conversion member 50 and the angle conversion member 52, the fluorescence Y that reaches the first surface 50a of the wavelength conversion member 50 and is incident on the first surface 50a at an angle equal to or greater than the critical angle is totally reflected by the first surface 50a and cannot be incident on the angle conversion member 52. In contrast, as in this embodiment, if the bonding layer 41 is present in the entire region between the wavelength conversion member 50 and the angle conversion member 52 and no gap is present, the amount of fluorescence Y that cannot be incident on the angle conversion member 52 can be reduced. From this perspective, it is desirable that the refractive index of the wavelength conversion member 50, the refractive index of the angle conversion member 52, and the bonding layer 41 match as closely as possible.

[0069] However, since the wavelength conversion member 50 is generally made of a material containing a phosphor such as YAG, and the angle conversion member 52 is generally made of a light-transmitting material such as borosilicate glass, the refractive index of the wavelength conversion member 50 is about 1.8, and the refractive index of the angle conversion member 52 is about 1.50 to 1.55. Thus, it is difficult to match the refractive index of the wavelength conversion member 50 and the refractive index of the angle conversion member 52 with each other. Therefore, it is desirable to match at least the refractive index of the angle conversion member 52 and the refractive index of the bonding layer 41 as much as possible. When borosilicate glass is used for the angle conversion member 52, the refractive index of the angle conversion member 52 is about 1.5, and by using a phenyl-based silicone resin as the adhesive for the bonding layer 41 and appropriately adjusting, for example, additives, the refractive index of the bonding layer 41 can be about 1.5, and the refractive indexes of both are approximately the same.

[0070] The holding member 45 will be described below with reference to FIGS. Fig. 6 is an enlarged perspective view of the vicinity of the holding member 45. Fig. 7 is an enlarged side view of the vicinity of the holding member 45. Fig. 8 is a perspective view showing the mounting structure of the holding member 45.

[0071] As shown in Figs. 6 to 8, the holding member 45 has a holding portion 451, an attachment portion 452, and a connecting portion 453. In the holding member 45, the holding portion 451, the attachment portion 452, and the connecting portion 453 are integrally formed of a plate-like metal material having elasticity. With this configuration, the heat dissipation and light resistance of the holding member 45 can be ensured, and the number of parts can be reduced, so that the configuration of the light source device 30 can be simplified. Specifically, the holding member 45 is integrally formed of a stainless steel plate such as SUS304. Therefore, the holding member 45 has elasticity as a whole and is configured to be elastically deformable. The holding member 45 may be formed of a metal material such as iron or aluminum in addition to stainless steel.

[0072] Specifically, the holding unit 451 has a surface of the flat plate portion 451a facing the -Y side (upper side in FIG. 6) bonded to a surface of the flange portion 522 facing the +Y side (lower side in FIG. 8) via an adhesive. Therefore, when the projector is installed so that the +Y side faces vertically downward, the holding unit 451 is in a state of supporting the weight of the angle conversion member 52 from below. The fixing means is not limited to an adhesive, and may be configured to fix the angle conversion member 52 by mechanically clamping both sides of the flange portion 522, for example. In this way, the holding unit 451 holds the angle conversion member 52 in a direction perpendicular to the support surface 54s of the support member 54 (Y-axis direction) while being fixed to the angle conversion member 52.

[0073] The mounting portion 452 is configured with a U-shaped curved portion that is convex toward the opposite side (+Y side) from the side where the angle conversion member 52 is fixed. As shown in FIG. 8, the holding member 45 is attached to the support member 54 by inserting the mounting portion 452 into a mounting hole 547 provided in the bottom surface of the accommodation recess 545 of the support member 54. Therefore, before the support member 54 is attached, the width of the mounting portion 452 in the X-axis direction is larger than the width of the mounting hole 547 in the X-axis direction, and when the support member 54 is attached, the mounting portion 452 is pressed into the inside of the mounting hole 547. The mounting portion 452 has a stopper portion 452a that abuts against the bottom surface of the accommodation recess 545. The stopper portion 452a may be joined to the bottom surface of the accommodation recess 545.

[0074] The connecting portion 453 is composed of a plate-like portion that connects the holding portion 451 and the attachment portion 452. The connecting portion 453 is inclined toward the +Y side and the +X side from the attachment portion 452 to the holding portion 451, and is elastically deformable in the longitudinal direction (X-axis direction) of the wavelength conversion member 50.

[0075] As shown in FIG. 7, the connecting portion 453 is disposed at a position spaced apart from the wavelength conversion member 50 and the angle conversion member 52. In this way, the holding member 45 is not in contact with the wavelength conversion member 50 and the angle conversion member 52, except for the joint portion of the holding portion 451 with the angle conversion member 52. This configuration can suppress leakage of the fluorescence Y that occurs when the wavelength conversion member 50 and the holding member 45, or the angle conversion member 52 and the holding member 45, come into contact with each other. In addition, it can suppress scratches and wear on the wavelength conversion member 50 and the angle conversion member 52 that occur due to contact with the holding member 45. With the above configuration, the holding portion 451 holds the angle conversion member 52 in a direction intersecting with the support surface 54s of the support member 54, and is displaceable in the longitudinal direction (X-axis direction) of the wavelength conversion member 50 relative to the support member 54.

[0076] 2, a collimating optical system 63 including a collimator lens or the like is provided between the light source device 30 and the integrator optical system 31. 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 31. 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.

[0077] The integrator optical system 31 has a first lens array 61 and a second lens array 62. The integrator optical system 31, together with the superimposing optical system 33, functions as a uniform illumination optical system that uniformizes the intensity distribution of the fluorescence Y emitted from the light source device 30 in each of the light modulation devices 4R and 4G, which are the illuminated areas. The fluorescence Y emitted from the collimating optical system 63 is incident on the first lens array 61. The first lens array 61, together with the second lens array 62, constitute the integrator optical system 31.

[0078] The first lens array 61 has a plurality of first lenses 61a. The plurality of first 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 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 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 is efficiently incident on the image forming areas of the light modulation devices 4R and 4G.

[0079] The fluorescence Y emitted from the first lens array 61 travels toward the second lens array 62. The second lens array 62 is disposed opposite to the first lens array 61. The second lens array 62 has a plurality of second lenses 62a corresponding to the plurality of first lenses 61a of the first lens array 61. The second lens array 62, together with the superimposing optical system 33, forms each of the images of the plurality of first 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 lenses 62a are arranged in a matrix in a plane parallel to the YZ plane perpendicular to the optical axis AX1 of the first illumination device 20. The superimposing optical system 33 is composed of one convex lens.

[0080] In this embodiment, the first lenses 61a of the first lens array 61 and the second lenses 62a of the second lens array 62 have the same size, but may have different sizes. In this embodiment, the first lenses 61a of the first lens array 61 and the second lenses 62a of the second lens array 62 are arranged at positions where their optical axes coincide with each other, but may be arranged in an eccentric state with respect to each other.

[0081] The polarization conversion element 32 converts the polarization direction of the fluorescence Y emitted from the second lens array 62. Specifically, the polarization conversion element 32 converts each partial light beam of the fluorescence Y split by the first lens array 61 and emitted from the second lens array 62 into linearly polarized light.

[0082] The polarization conversion element 32 has a polarization separation layer (not shown), a reflection layer (not shown), and a phase difference plate (not shown). The polarization separation layer transmits one linearly polarized component of the polarization components contained in the fluorescence Y emitted from the light source device 30 as is, and reflects the other linearly polarized component in a direction perpendicular to the optical axis AX1. The reflection layer reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1. The phase difference plate converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component.

[0083] [Effects of the first embodiment] The light source device 30 of this embodiment includes a light emitting element 56 that emits excitation light, a wavelength conversion member 50 that guides the fluorescence Y generated from the excitation light E emitted from the light emitting element 56, an angle conversion member 52 that converts the angular distribution of the fluorescence Y emitted from the wavelength conversion member 50, a support member 54 having a support surface 54s that supports the wavelength conversion member 50, and a holding member 45 that holds the angle conversion member 52. The wavelength conversion member 50 has a first surface 50a and a second surface 50b that are located opposite each other in the X-axis direction, and side surfaces 50c, 50d, 50e, and 50f that contact the first surface 50a and the second surface 50b, respectively. The angle conversion member 52 has an incident end surface 52a into which the fluorescence Y emitted from the wavelength conversion member 50 is incident, and an exit end surface 52b that emits the fluorescence Y incident from the incident end surface 52a. Fluorescence Y guided through the wavelength conversion member 50 is emitted from the first surface 50a toward the incident end surface 52a, and excitation light E emitted from the light emitting element 56 is incident on the wavelength conversion member 50 from the side surface 50c. The holding member 45 has a holding portion 451 that holds the angle conversion member 52 in a state fixed to the angle conversion member 52. The holding portion 451 holds the angle conversion member 52 in a direction intersecting with the support surface 54s (the Y-axis direction) and is displaceable in the X-axis direction relative to the support member 54.

[0084] In the light source device of Patent Document 1, the movement of the collimator in the longitudinal direction of the light guide is restricted by the optical interface plate. Therefore, for example, when the light guide is thermally expanded, stress is generated at the joint surface between the light guide and the collimator, and the collimator may peel off from the light guide. In addition, the light source device of Patent Document 1 includes a spring member having elasticity in the longitudinal direction of the light guide. However, since the distance between the contact portion between the spring member and the light guide and the joint surface between the collimator and the light guide is large, if the shape of the light guide is changed due to a temperature change, the acting direction of the elastic force of the spring member may deviate from the normal direction of the joint surface between the collimator and the light guide. In this case, shear stress is generated at the joint surface between the collimator and the light guide, and the collimator may peel off.

[0085] In contrast, in the light source device 30 of the present embodiment, since the angle conversion member 52 is held by the holding portion 451 of the holding member 45, even if the joining area between the wavelength conversion member 50 and the angle conversion member 52 is small and the joining force is reduced, the joining state between the wavelength conversion member 50 and the angle conversion member 52 can be stably secured. Furthermore, since the holding portion 451 of the holding member 45 is displaceable in the X-axis direction relative to the support member 54 supporting the wavelength conversion member 50, even if the wavelength conversion member 50 or the support member 54 expands or contracts in the X-axis direction due to thermal expansion, the holding portion 451 is displaced in response to the expansion or contraction of the wavelength conversion member 50 or the support member 54, and large shear stress is prevented from occurring at the joining portion between the wavelength conversion member 50 and the angle conversion member 52. As a result, according to the present embodiment, the angle conversion member 52 is prevented from peeling off from the wavelength conversion member 50, and a light source device 30 that can stably obtain a desired light output can be realized.

[0086] Furthermore, the light source device 30 of this embodiment includes a first pressing member 90 that presses the wavelength conversion member 50 against the support surface 54s of the support member 54, and a second pressing member 58 that presses the mirror 53 against the second surface 50b of the wavelength conversion member 50. Therefore, the pressing force of the second pressing member 58 pressing the wavelength conversion member 50 in the X-axis direction via the mirror 53 is mitigated at the joint surface between the angle conversion member 52 and the wavelength conversion member 50 by the first pressing member 90 pressing the wavelength conversion member 50 in the Y-axis direction. Furthermore, the acting direction of the pressing force by the second pressing member 58 is less likely to deviate from the normal direction of the joint surface between the angle conversion member 52 and the wavelength conversion member 50 by the first pressing member 90 pressing the wavelength conversion member 50 in the Y-axis direction. As a result, even if the shape of wavelength conversion member 50 changes due to, for example, heat, the shear stress at the joint surface between angle conversion member 52 and wavelength conversion member 50 caused by the pressing force of second pressing member 58 can be reduced.

[0087] The projector 1 of this embodiment is equipped with the light source device 30 of this embodiment, and therefore has excellent display quality.

[0088] [Second embodiment] A second embodiment of the present invention will now be described with reference to FIG. The basic configurations of the projector and light source device of the second embodiment are similar to those of the first embodiment, and differ from the first embodiment in that a holding member is added, so a description of the basic configurations of the projector and light source device will be omitted. FIG. 9 is a perspective view showing the vicinity of a holding member 47 of a light source device 40 according to the second embodiment. In FIG. 9, components common to those in the drawings used in the first embodiment are given the same reference numerals, and description thereof will be omitted.

[0089] Light source device 40 of the present embodiment includes a wavelength conversion member 50, an angle conversion member 52, and a holding member 47. As in the first embodiment, light source device 40 includes, in addition to the above-mentioned components, components such as a light source unit, a mirror, a support member, a position restriction member, a first pressing member, and a second pressing member (not shown).

[0090] 9, the holding member 47 has a holding portion 471, an attachment portion 472, and a connecting portion 473. In the holding member 47, the holding portion 471, the attachment portion 472, and the connecting portion 473 are integrally formed from an elastic plate-shaped metal material. The constituent material of the holding member 47 is the same as that of the first embodiment. The holding member 47 is configured to be elastically deformable as a whole.

[0091] The holding portion 471 is fixed to the end surface of the flange portion 522 of the angle conversion member 52 by a fixing means such as an adhesive. The holding portion 471 is provided with a plurality of claw portions 471a rising on the +Y side. Of the plurality of claw portions 471a, a pair of the claw portions 471a faces the surface of the flange portion 522 on the side of the emission end surface 52b. However, since the claw portions 471a are located outside the region 52R from which the fluorescence Y is substantially emitted, they do not block the fluorescence Y emitted from the angle conversion member 52. The fixing means is not limited to an adhesive, and may be configured to fix the angle conversion member 522 by mechanically clamping both sides of the flange portion 522, for example. In this way, the holding portion 471 holds the angle conversion member 52 in a direction intersecting the support surface of the support member while being fixed to the angle conversion member 52.

[0092] The mounting portion 472 is configured from a clip-shaped portion including a pair of clamping pieces 472a. The holding member 47 is attached to the wavelength conversion member 50 by the pair of clamping pieces 472a of the mounting portion 472 clamping the wavelength conversion member 50 from two side surfaces 50e, 50f. The mounting portion 472 does not clamp the wavelength conversion member 50 so firmly that it cannot be displaced in the longitudinal direction of the wavelength conversion member 50. The mounting portion 472 is displaceable by sliding along the longitudinal direction of the wavelength conversion member 50.

[0093] The connecting portion 473 is formed of a plate-like portion that connects the holding portion 471 and the attachment portion 472. The connecting portion 473 is inclined from the attachment portion 472 to the holding portion 471 toward the +Y side and the +X side.

[0094] With the above configuration, the holding portion 471 holds the angle conversion member 52 in a direction intersecting the support surface 54s of the support member 54, and is displaceable in the longitudinal direction of the wavelength conversion member 50 (X-axis direction) relative to the support member 54. The other configuration of the light source device 40 is similar to that of the first embodiment.

[0095] [Effects of the second embodiment] In light source device 40 of the present embodiment, angle conversion member 52 is held by holding member 47, which makes the bonded state between wavelength conversion member 50 and angle conversion member 52 more stable, and holding portion 471 is displaceable in the X-axis direction relative to support member 54, which prevents large stress from being generated at the bonded portion between wavelength conversion member 50 and angle conversion member 52 even if wavelength conversion member 50 or support member 54 expands and contracts in the X-axis direction. As a result, peeling of angle conversion member 52 from wavelength conversion member 50 is prevented, and a light source device 40 that can stably obtain a desired light output can be realized, which is an effect similar to that of the first embodiment.

[0096] 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 the above embodiment, a CPC is used as the angle conversion member. However, instead of a CPC, a tapered rod in the shape of a truncated square pyramid with an exit end face having an area larger than that of an entrance end face may be used.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] [Summary of this disclosure] The following is a summary of this disclosure.

[0102] (Appendix 1) A light emitting element that emits light; a light guiding member that guides the light emitted from the light emitting element; an angle conversion member that converts an angular distribution of the light emitted from the light guiding member; a support member having a support surface for supporting the light guide member; A holding member for holding the angle conversion member; Equipped with The light guiding member is a first surface and a second surface located opposite to each other in a longitudinal direction of the light guide member; a side surface contacting the first surface and a side surface contacting the second surface; having The angle conversion member is an incident end surface on which the light emitted from the light guiding member is incident; an exit end surface from which the light incident from the entrance end surface exits; having the light guided through the light guide member is emitted from the first surface toward the incident end surface, the light emitted from the light emitting element is incident on the light guiding member from the side surface, the holding member has a holding portion that holds the angle conversion member in a state where the holding portion is fixed to the angle conversion member, The holding portion holds the angle conversion member in a direction intersecting with the support surface, and is displaceable in the longitudinal direction relative to the support member.

[0103] According to the configuration of Supplementary Note 1, the angle conversion member is held by the holding member, which makes the joint state between the light guiding member and the angle conversion member more stable, and the holding part is displaceable in the longitudinal direction of the light guiding member relative to the support member, which makes it possible to prevent large stress from occurring at the joint between the light guiding member and the angle conversion member even if the light guiding member or the support member expands and contracts in the longitudinal direction. As a result, peeling of the angle conversion member from the light guiding member is suppressed, and a light source device that can stably obtain the desired light output can be realized.

[0104] (Appendix 2) the holding member is not in contact with the light guiding member, the holding member has the holding portion, an attachment portion attached to the support member, and a connecting portion connecting the holding portion and the attachment portion, 2. The light source device according to claim 1, wherein the connecting portion is elastically deformable in the longitudinal direction.

[0105] According to the configuration of Supplementary Note 2, it is possible to suppress light leakage that occurs when the light guiding member or the angle conversion member comes into contact with the holding member, and also to suppress scratches and wear on the light guiding member and the angle conversion member. In addition, since the holding member is supported in a state where it is attached to the support member, it is possible to stably hold the angle conversion member.

[0106] (Appendix 3) 3. The light source device according to claim 2, wherein the holding member is integrally formed from a metal material.

[0107] According to the configuration of Supplementary Note 3, the heat dissipation property and light resistance of the holding member can be ensured, the number of parts can be reduced, and the configuration of the light source device can be simplified.

[0108] (Appendix 4) the holding member includes the holding portion, an attachment portion attached to the light guide member, and a connecting portion connecting the holding portion and the attachment portion, 2. The light source device according to claim 1, wherein the mounting portion is displaceable in the longitudinal direction relative to the light-guiding member.

[0109] According to the configuration of Supplementary Note 4, the mounting portion is capable of being displaced in the longitudinal direction relative to the light-guiding member, so that even if the light-guiding member or the support member expands and contracts in the longitudinal direction of the light-guiding member, it is possible to prevent large stress from occurring at the joint between the light-guiding member and the angle conversion member.

[0110] (Appendix 5) The angle conversion member is an angle conversion member body including the incident end surface and the exit end surface; a flange portion that protrudes outward from the exit end surface with respect to an optical axis of the angle conversion member; having 5. The light source device according to claim 1, wherein the holding portion holds the angle conversion member at the flange portion.

[0111] According to the configuration of Supplementary Note 5, since the holding portion is located outside the main body of the angle conversion member, the light emitted from the angle conversion member is prevented from being blocked by the holding portion, and a decrease in light output can be suppressed.

[0112] (Appendix 6) a first pressing member that presses the side surface of the light guide member toward the support surface; a reflecting member that reflects the light that reaches the second surface of the light guiding member; a second pressing member that presses the reflecting member toward the second surface; 6. The light source device according to claim 1, further comprising:

[0113] According to the configuration of Supplementary Note 6, the pressing force of the second pressing member pressing the light guide member in the longitudinal direction of the light guide member is mitigated at the joint surface between the angle conversion member and the wavelength conversion member by the first pressing member pressing the side surface of the light guide member toward the support surface. Therefore, even if the shape of the light guide member changes due to heat, for example, the shear stress at the joint surface between the angle conversion member and the light guide member caused by the pressing force of the second pressing member can be reduced. This makes it difficult for the angle conversion member to peel off from the light guide member.

[0114] (Appendix 7) the light emitting element emits a first light having a first wavelength band; The light source device according to any one of claims 1 to 6, 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.

[0115] According to the configuration of Supplementary Note 7, it is possible to realize a light source device capable of emitting the second light obtained by wavelength conversion of the first light.

[0116] (Appendix 8) A light source device according to any one of claims 1 to 7, 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

[0117] According to the configuration of Supplementary Note 8, a projector capable of projecting an image with excellent display quality can be realized. [Explanation of symbols]

[0118] 1...projector, 4B, 4G, 4R...light modulation device, 6...projection optical device, 30...light source device, 45, 47...holding member, 50...wavelength conversion member (light guiding member), 50a...first surface, 50b...second surface, 50c, 50d, 50e, 50f...side surface (first side surface), 52...angle conversion member, 52a...incident end surface, 52b...exiting end surface, 53...mirror (reflective member), 54...support member, 56...light emitting element, 58...second pressing member, 90...first pressing member, 451, 471...holding portion, 452, 472...mounting portion, 453, 473...connecting portion, 521...angle conversion member main body, 522...flange portion, E...excitation light (first light), Y...fluorescence (second light).

Claims

1. A light emitting element that emits light; a light guiding member that guides the light emitted from the light emitting element; an angle conversion member that converts an angular distribution of the light emitted from the light guiding member; a support member having a support surface for supporting the light guide member; A holding member for holding the angle conversion member; Equipped with The light guiding member is a first surface and a second surface located opposite to each other in a longitudinal direction of the light guide member; a side surface contacting the first surface and a side surface contacting the second surface; having The angle conversion member is an incident end surface on which the light emitted from the light guiding member is incident; an exit end surface from which the light incident from the entrance end surface exits; having the light guided through the light guide member is emitted from the first surface toward the incident end surface, the light emitted from the light emitting element is incident on the light guiding member from the side surface, the holding member has a holding portion that holds the angle conversion member in a state where the holding portion is fixed to the angle conversion member, The holding portion holds the angle conversion member in a direction intersecting with the support surface, and is displaceable in the longitudinal direction relative to the support member.

2. the holding member is not in contact with the light guiding member, the holding member has the holding portion, an attachment portion attached to the support member, and a connecting portion connecting the holding portion and the attachment portion, The light source device according to claim 1 , wherein the connecting portion is elastically deformable in the longitudinal direction.

3. The light source device according to claim 2 , wherein the holding member is integrally formed from a metal material.

4. the holding member includes the holding portion, an attachment portion attached to the light guide member, and a connecting portion connecting the holding portion and the attachment portion, The light source device according to claim 1 , wherein the attachment portion is displaceable in the longitudinal direction relative to the light guide member.

5. The angle conversion member is an angle conversion member body including the incident end surface and the exit end surface; a flange portion that protrudes outward from the exit end surface with respect to an optical axis of the angle conversion member; having The light source device according to claim 1 , wherein the holding portion holds the angle conversion member at the flange portion.

6. a first pressing member that presses the side surface of the light guide member toward the support surface; a reflecting member that reflects the light that reaches the second surface of the light guiding member; a second pressing member that presses the reflecting member toward the second surface; The light source device according to claim 1 , further comprising:

7. the light-emitting element emits a first light having a first wavelength band; 3. 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.

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

Images