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; a first suction member connected to the angle conversion member; and a second suction member supported by the support member, and arranged on a side of the first suction member where the light guide member is located in a direction along an optical axis. The light guide member has a first surface and a second surface located on the opposite sides to each other, and a side face. 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 first suction member and the second suction member are formed of magnetic substances, and generate suction forces attracting the suction members to each other to apply a pressing force to press the first surface and the incident end face to each other.SELECTED DRAWING: Figure 6

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, and a collimator optically coupled to the light guide. [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, the collimator is bonded to the end face of the light guide. An adhesive is generally used to bond the collimator and the light guide. In this configuration, the area of ​​the end face of the light guide is small compared to the size of the collimator, so there is a risk that the desired bonding strength cannot be obtained. In addition, if the adhesive deteriorates due to a rise in temperature of the adhesive, the bonding strength may also decrease. If the collimator peels off from the light guide, there is a problem that the light source device cannot obtain the desired light output.

[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 has little loss of output light and can emit light with a desired intensity. [Means for solving the problem]

[0006] In order to solve the above problems, a light source device according to one embodiment 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, a first suction member connected to the angle conversion member, and a second suction member that is supported by the support member and is disposed on the side where the light guiding member is located relative to the first suction member in a direction along the optical axis of the light emitted from the light guiding member. The light guiding member has a first surface and a second surface that are positioned opposite each other in the longitudinal direction of the light guiding member, and a side surface that is in contact with 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 from which the light incident from the incident end surface is exited. The light guided through the light guide 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 guide member from the side surface. The first and second attraction members are made of magnetic materials and generate an attraction force in a direction in which they attract each other, thereby applying a pressing force that presses the first surface and the incident end surface against each other.

[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] 4 is an enlarged perspective view of the vicinity of the first suction member and the second suction member. FIG. [Figure 7] 13 is an enlarged perspective view of the vicinity of a first suction member and a second suction member in a light source device according to a second embodiment. FIG. [Figure 8] 4 is an enlarged plan view of the vicinity of the first suction member and the second suction member. FIG. [Figure 9] 13 is an enlarged plan view of the vicinity of a first suction member and a second suction member in a light source device according to a third embodiment. FIG. [Figure 10] 13 is an enlarged plan view of the vicinity of a first suction member and a second suction member in a light source device of a first modified example. FIG. [Figure 11] 13 is an enlarged plan view of the vicinity of a first suction member and a second suction member in a light source device of a second modified example. 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 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, 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 10, and do not limit the installation posture or direction of the projector 10. 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 the light source device 30. Fig. 4 is a plan view of the light source device 30. Fig. 5 is a cross-sectional view of the light source device 30 taken along the line VV in Fig. 3.

[0029] As shown in Figures 3 to 5, the light source device 30 includes a wavelength conversion member 50, a light source unit 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, a first suction member 71, and a second suction member 72.

[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 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 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 the Z-axis have lengths of about 1 to 2 mm, and the sides extending along the X-axis have lengths of about 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 recess 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 154. The first pressing member 90 is disposed facing the support surface 54s of the groove 154. As a result, the first pressing member 90 restricts the wavelength conversion member 50 from moving to the -Y side inside the groove 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 recess 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, the support member 54 has a groove portion 154, a first accommodating recess 541, a second accommodating recess 542, a third accommodating recess 543, a first accommodating groove portion 545, and a second accommodating groove portion 546. The support member 54 is a plate-like member having a rectangular planar shape. The third accommodating recess 543, the first accommodating groove portion 545, and the second accommodating groove portion 546 will be described later with reference to FIG. 6.

[0049] 5, groove portion 154 has a cross section perpendicular to the X-axis direction that is substantially U-shaped. Groove portion 154 has a support surface 54s, a first wall surface 54a, and a second wall surface 54b. Groove portion 154 is formed by cutting a metal such as aluminum, iron, or stainless steel, which is a constituent material of support member 54. Groove portion 154 extends in the X-axis direction along the longitudinal direction of wavelength conversion member 50, and accommodates wavelength conversion member 50.

[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 recess 541 is a groove portion provided on the upper surface of the supporting member 54 and recessed into the upper surface of the supporting member 54. The first accommodating recess 541 is provided on both sides in the Z-axis direction of the groove portion 154. The first accommodating recess 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 recess 542 is a groove provided on the upper surface of the supporting member 54 and recessed into the upper surface of the supporting member 54. The second accommodating recess 542 is provided on both sides in the Z-axis direction of the groove portion 154. The second accommodating recess 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] 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.

[0061] 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 emission 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 emission end face 52b. Each of the four side faces 52c functions as a reflection surface that reflects the fluorescence Y incident from the incident end face 52a toward the emission end face 52b. Hereinafter, the side face 52c may also be referred to as the reflection surface 52c. The length from the incident end face 52a to the emission end face 52b of the angle conversion member 52 is, for example, about 7 mm. Therefore, the length in the X-axis direction of the angle conversion member 52 is shorter than the length in the X-axis direction of the wavelength conversion member 50.

[0062] 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.

[0063] An axis that passes through the centers of the emission end face 52b and the incidence end face 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. Hereinafter, of the angle conversion member 52, a portion that includes the incidence end face 52a, the emission end face 52b, and the reflection surface 52c and that substantially contributes to the angle conversion of the fluorescence Y is referred to as the angle conversion member main body 521, and a portion that protrudes outside the effective emission region 52R from which the fluorescence Y that can be used in the downstream optical system is emitted is referred to as the flange portion 522.

[0064] 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 emission end face 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 face 52b smaller than the maximum incidence angle of the fluorescence Y at the incidence end face 52a.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 with 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, the additives contained in the adhesive, the refractive index of the bonding layer 41 can be about 1.5, and the refractive indexes of both are approximately the same.

[0069] Hereinafter, the first suction member 71 and the second suction member 72 will be described with reference to FIG. FIG. 6 is an enlarged perspective view of the first suction member 71 and the second suction member 72 and their vicinity. 6, a third accommodating recess 543 is provided in support member 54. The third accommodating recess 543 is a recess that is recessed with respect to the upper surface of support member 54. The third accommodating recess 543 is provided on the +X side of groove portion 154, that is, on the side where fluorescence Y is emitted from first surface 50a of wavelength conversion member 50. The third accommodating recess 543 accommodates angle conversion member 52 and first suction member 71 joined to wavelength conversion member 50.

[0070] The first housing groove 545 and the second housing groove 546 are provided in the support member 54 on the side (-X side) closer to the wavelength conversion member 50 than the flange portion 522 of the angle conversion member 52 in the direction of the optical axis J (X-axis direction). The first housing groove 545 and the second housing groove 546 each extend in the Z-axis direction. The first housing groove 545 is provided on the +Z side with respect to the optical axis J. The second housing groove 546 is provided on the -Z side with respect to the optical axis J. That is, the first housing groove 545 and the second housing groove 546 are provided on opposite sides to each other with respect to the optical axis J. The first housing groove 545 accommodates a third suction portion 723 of the second suction member 72, which will be described later. The second housing groove 546 accommodates a fourth suction portion 724 of the second suction member 72, which will be described later.

[0071] The first suction member 71 has a frame portion 710, a first suction portion 711, and a second suction portion 712. In the first suction member 71, the frame portion 710, the first suction portion 711, and the second suction portion 712 are integrally formed of a magnetic body made of a plate-shaped metal material. Specific examples of the magnetic body include iron, silicon steel plate, and permalloy.

[0072] The frame 710 is fixed to the emission end surface 52b of the angle conversion member 52 by adhesive or the like. The fixing means to the angle conversion member 52 is not limited to adhesive, and may be configured to fix the frame 710 by mechanically clamping both sides of the flange portion 522, for example. The frame 710 has a frame-like shape that covers the outside of the effective emission region 52R of the emission end surface 52b of the angle conversion member 52. That is, the frame 710 has an opening 710h in the center, and exposes the effective emission region 52R of the angle conversion member 52 from the opening 710h. In this way, if the first suction member 71 is configured to be fixed to the flange portion 522 of the angle conversion member 52, the first suction member 71 does not interfere with the fluorescence Y emitted from the angle conversion member 52. In addition, it is also possible to suppress leakage of the fluorescence Y through the first suction member 71. This makes it possible to suppress loss of the fluorescence Y caused by the first suction member 71.

[0073] The first suction portion 711 is provided protruding toward the +Z side of the frame portion 710 via an inclined portion inclined with respect to the YZ plane. The first suction portion 711 has a flat plate shape and extends parallel to the YZ plane. The second suction portion 712 is provided protruding toward the -Z side of the frame portion 710, opposite to the first suction portion 711, via an inclined portion inclined with respect to the YZ plane. The second suction portion 712 has a flat plate shape and extends parallel to the YZ plane.

[0074] The second attraction member 72 has a third attraction portion 723 and a fourth attraction portion 724. The third attraction portion 723 and the fourth attraction portion 724 are made of the same magnetic material and are made of plate-shaped permanent magnets. Examples of materials for the permanent magnets include neodymium and samarium cobalt. As described above, the third attraction portion 723 is accommodated in the first accommodation groove portion 545 provided in the support member 54. The fourth attraction portion 724 is accommodated in the second accommodation groove portion 546 provided in the support member 54. Therefore, the second attraction member 72 is disposed on the side where the wavelength conversion member 50 is located with respect to the first attraction member 71 in the direction along the optical axis J of the fluorescence Y emitted from the wavelength conversion member 50.

[0075] The first attraction member 71 may be made of a permanent magnet. That is, it is desirable that at least one of the first attraction member 71 and the second attraction member 72 is made of a permanent magnet. With this configuration, even when the light source device 30 is not powered on, an attraction force is generated between the first attraction member 71 and the second attraction member 72, so that the angle conversion member 52 and the wavelength conversion member 50 can be reliably maintained in a joined state.

[0076] With the above configuration, the first suction portion 711 and the third suction portion 723 face each other in a direction along the optical axis J and are spaced apart from each other. The second suction portion 712 and the fourth suction portion 724 face each other in a direction along the optical axis J and are spaced apart from each other. The first suction portion 711 and the third suction portion 723 are disposed on one side (+Z side) of the optical axis J. The second suction portion 712 and the fourth suction portion 724 are disposed on the other side (-Z side) of the optical axis J. That is, the first suction portion 711 and the third suction portion 723, and the second suction portion 712 and the fourth suction portion 724 are disposed on opposite sides of the optical axis J. With this configuration, the angle conversion member 52 and the wavelength conversion member 50 are unlikely to be pressed in a direction inclined from the optical axis J, so that the generation of a large shear stress at the joint between the wavelength conversion member 50 and the angle conversion member 52 is suppressed.

[0077] Furthermore, the support member 54 has an opening 54k that exposes a part of the second suction member 72 from each of the first accommodating groove portion 545 and the second accommodating groove portion 546. As a result, the first suction portion 711 and the third suction portion 723 face each other through the opening 54k, and the second suction portion 712 and the fourth suction portion 724 face each other through the opening 54k. At the position of the opening 54k, there is no other member between the first suction portion 711 and the third suction portion 723, and air is present. At the position of the opening 54k, there is no other member between the second suction portion 712 and the fourth suction portion 724, and air is present. According to this configuration, the interval between the first suction portion 711 and the third suction portion 723 and the interval between the second suction portion 712 and the fourth suction portion 724 can be narrowed, and the suction force between the first suction member 71 and the second suction member 72 can be increased. The distance between the first suction portion 711 and the third suction portion 723, and the distance between the second suction portion 712 and the fourth suction portion 724 are each, for example, about 0.1 to 2.0 mm.

[0078] As described above, the first attraction member 71 and the second attraction member 72 are made of a magnetic material, and therefore generate an attraction force in a direction in which they attract each other, and apply a pressing force in a direction in which the first surface 50a of the wavelength conversion member 50 and the incident end surface 52a of the angle conversion member 52 press each other. Furthermore, the first attraction member 71 and the second attraction member 72 are spaced apart from each other even in a state in which an attraction force is generated in the direction in which they attract each other.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] [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 fluorescence Y generated from 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, a first suction member 71 connected to the angle conversion member 52, and a second suction member 72 that is supported by the support member 54 and is arranged on the side where the wavelength conversion member 50 is located with respect to the first suction member 71 in the direction along the optical axis J of the fluorescence Y emitted from the wavelength conversion member 50. 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 on which the fluorescence Y emitted from the wavelength conversion member 50 is incident, and an exit end surface 52b from which the fluorescence Y incident from the incident end surface 52a exits. The fluorescence Y guided through the wavelength conversion member 50 is emitted from the first surface 50a toward the incident end surface 52a, and the excitation light E emitted from the light emitting element 56 is incident on the wavelength conversion member 50 from the side surface 50c. The first attraction member 71 and the second attraction member 72 are made of a magnetic material, and apply a pressing force that presses the first surface 50a and the incident end surface 52a against each other by generating an attractive force in the direction in which they attract each other.

[0087] In the light source device of Patent Document 1, the area of ​​the end face of the light guide is small compared to the size of the collimator, so the bonding area is small and there is a risk that the desired bonding strength cannot be obtained. In addition, when light incident on the collimator from the light guide passes through the adhesive at a high light density, the temperature of the adhesive increases, which may cause the adhesive to deteriorate and reduce the bonding strength. If the collimator peels off from the light guide, there is a problem that the light source device cannot obtain the desired light output.

[0088] In contrast, in the light source device 30 of the present embodiment, the first suction member 71 and the second suction member 72 generate suction forces in the directions in which they attract each other, and the first surface 50a of the wavelength conversion member 50 and the incident end surface 52a of the angle conversion member 52 press each other. Therefore, even if the bonding area between the wavelength conversion member 50 and the angle conversion member 52 is small and the bonding strength of the bonding layer 41 decreases, the bonded state between the wavelength conversion member 50 and the angle conversion member 52 can be stably maintained. As a result, according to the present embodiment, it is possible to realize a light source device 30 in which the angle conversion member 52 is prevented from peeling off from the wavelength conversion member 50 and a desired light output can be stably obtained.

[0089] Furthermore, 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. In addition, in a pressing structure using a spring, manufacturing variations in the spring result in variations in the pressing force, making it difficult to press the collimator and the light guide evenly.

[0090] In contrast, in the light source device 30 of the present embodiment, the first suction member 71 and the second suction member 72 are spaced apart from each other while generating suction forces in directions in which they attract each other. With this configuration, even if the wavelength conversion member 50 expands and contracts in the X-axis direction due to thermal expansion, the distance between the first suction member 71 and the second suction member 72 changes in response to the expansion and contraction of the wavelength conversion member 50, and the expansion and contraction of the wavelength conversion member 50 is absorbed by the change in the distance between the first suction member 71 and the second suction member 72. Therefore, even if the temperature of the wavelength conversion member 50 changes, the generation of a large shear stress at the joint between the wavelength conversion member 50 and the angle conversion member 52 is suppressed, and peeling of the angle conversion member 52 can be suppressed.

[0091] In the present embodiment, since the second suction member 72 is supported by the support member 54 and the wavelength conversion member 50 is supported by the support member 54, when a suction force is generated between the first suction member 71 and the second suction member 72, a pressing force acts so that the incident end surface 52a of the angle conversion member 52 presses the first surface 50a of the wavelength conversion member 50. Therefore, if the wavelength conversion member 50 is configured to be easily moved toward the second surface 50b (-X side), there is a risk that the incident end surface 52a of the angle conversion member 52 will not be sufficiently pressed against the first surface 50a of the wavelength conversion member 50. In response to this, the light source device 30 of the present 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. This prevents the wavelength conversion member 50 from easily moving toward the second surface 50b (-X side), and the incident end surface 52a is sufficiently pressed against the first surface 50a, reliably preventing peeling of the angle conversion member 52.

[0092] Furthermore, because first pressing member 90 presses wavelength conversion member 50 in the Y-axis direction, the direction of action of the pressing force by second pressing member 58 is unlikely to deviate from the normal direction of the bonding surface between angle conversion member 52 and wavelength conversion member 50. As a result, even if the shape of wavelength conversion member 50 changes due to heat, for example, the shear stress at the bonding surface between angle conversion member 52 and wavelength conversion member 50 caused by the pressing force by second pressing member 58 can be reduced.

[0093] The projector 1 of this embodiment is equipped with the light source device 30 of this embodiment, and therefore has excellent display quality.

[0094] [Second embodiment] A second embodiment of the present invention will now be described with reference to FIGS. The basic configurations of the projector and light source device of the second embodiment are similar to those of the first embodiment, but the configuration of the first suction member is different from that of the first embodiment, so a description of the basic configurations of the projector and light source device will be omitted. Fig. 7 is an enlarged perspective view of the vicinity of the first suction member 75 and the second suction member 72 in the light source device 40 of the second embodiment. Fig. 8 is an enlarged plan view of the vicinity of the first suction member 75 and the second suction member 72. 7 and 8, components common to the drawings used in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

[0095] 7 and 8, in light source device 40 of the present embodiment, first suction member 75 has a first suction portion 751 and a second suction portion 752. The constituent material of first suction member 75 is, as in the first embodiment, for example, iron, silicon steel plate, permalloy, etc. In the present embodiment, unlike the first embodiment, first suction member 75 does not have a frame portion, and first suction portion 751 and second suction portion 752 are separate members.

[0096] The first suction portion 751 is provided to protrude toward the +Z side of the flange portion 522 via a joint portion parallel to the YZ plane and an inclined portion inclined with respect to the YZ plane. The first suction portion 751 has a flat plate shape and extends parallel to the YZ plane. The second suction portion 752 is provided to protrude toward the -Z side of the flange portion 522, opposite to the first suction portion 751, via a joint portion parallel to the YZ plane and an inclined portion inclined with respect to the YZ plane. The second suction portion 752 has a flat plate shape and extends parallel to the YZ plane.

[0097] In the first suction member 71 of the first embodiment, the frame portion 710 is joined to a surface on the emission end surface 52b side of the flange portion 522 of the angle conversion member 52. In contrast, in the first suction member 75 of the present embodiment, the first suction portion 751 and the second suction portion 752 are each joined to a surface on the opposite side to the emission end surface 52b of the flange portion 522 of the angle conversion member 52. That is, the surfaces of the flange portion 522 of the angle conversion member 52 to which the first suction members 71 and 75 are joined are opposite to each other in the first and second embodiments. The other configuration of the light source device 40 is similar to that of the first embodiment.

[0098] [Effects of the second embodiment] In the light source device 40 of this embodiment, the first suction member 75 and the second suction member 72 attract each other, so that the first surface 50a of the wavelength conversion member 50 and the incident end surface 52a of the angle conversion member 52 press each other, and therefore the bonded state between the wavelength conversion member 50 and the angle conversion member 52 is stably maintained, and since the first suction member 75 and the second suction member 72 are spaced apart from each other, even if the wavelength conversion member 50 expands or contracts in the X-axis direction, the generation of large stress at the bonded portion between the wavelength conversion member 50 and the angle conversion member 52 is suppressed. As a result, peeling of the angle conversion member 52 from the wavelength conversion member 50 is suppressed, and the light source device 40 that can stably obtain the desired light output can be realized, which is an effect similar to that of the first embodiment.

[0099] Furthermore, in the case of this embodiment, since the first suction member 75 is joined to the surface of the flange portion 522 opposite to the emission end surface 52b, when the collimator lens constituting the collimating optical system 63 is arranged close to the angle conversion member as shown in Fig. 8, the collimator lens is less likely to interfere with the first suction member 75 compared to the first embodiment. Therefore, the collimator lens can be brought sufficiently close to the angle conversion member 52. As a result, the amount of fluorescence Y incident on the collimating optical system 63 can be increased, and the utilization efficiency of the fluorescence Y can be improved.

[0100] [Third embodiment] Hereinafter, a third embodiment of the present invention will be described with reference to FIG. The basic configurations of the projector and light source device of the third embodiment are similar to those of the first embodiment, but the arrangement of the first suction member and the second suction member differs from that of the first embodiment. Therefore, a description of the basic configurations of the projector and light source device will be omitted. FIG. 9 is an enlarged plan view of the vicinity of the first suction member 77 and the second suction member 72 in the light source device 60 of the third 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.

[0101] 9, in the light source device 60 of the present embodiment, the first suction member 77 has a first suction portion 771 and a second suction portion 772. The first suction portion 771 and the second suction portion 772 are each joined to a surface of the flange portion 522 of the angle conversion member 52 opposite to the emission end surface 52b.

[0102] The first suction portion 771 extends at an incline with respect to the YZ plane on the +Z side of the flange portion 522. The end portion (the end portion on the +Z side) of the first suction portion 771 opposite to the joint portion with the flange portion 522 is inclined toward the side (the -X side) approaching the wavelength conversion member 50. If the angle between the surface of the first suction portion 771 facing the third suction portion 723 and the YZ plane is defined as an inclination angle θ1, the inclination angle θ1 of the first suction portion 771 is, for example, greater than 0° and equal to or less than 50°, and preferably greater than 0° and equal to or less than 40°.

[0103] The second suction portion 772 extends at an inclination with respect to the YZ plane on the -Z side of the flange portion 522. The end portion (the end portion on the -Z side) of the second suction portion 772 opposite to the joint portion with the flange portion 522 is inclined toward the side (the -X side) approaching the wavelength conversion member 50. If the angle between the surface of the second suction portion 772 facing the fourth suction portion 724 and the YZ plane is defined as an inclination angle θ2, it is desirable that the inclination angle θ2 of the second suction portion 772 be equal to the inclination angle θ1 of the first suction portion 771.

[0104] In the second suction member 72, the third suction portion 723 is disposed so that its end portion (end portion on the +Z side) farther from the angle conversion member 52 is inclined toward the side (-X side) approaching the wavelength conversion member 50 in correspondence with the first suction portion 771. The fourth suction portion 724 is disposed so that its end portion (end portion on the -Z side) farther from the angle conversion member 52 is inclined toward the side (-X side) approaching the wavelength conversion member 50 in correspondence with the second suction portion 772. That is, in the case of this embodiment, the two opposing surfaces of the first suction member 77 and the second suction member 72 are parallel to each other, and the opposing directions of the two opposing surfaces are non-parallel to the direction of the optical axis J. The other configuration of the light source device 60 is similar to that of the first embodiment.

[0105] [Effects of the third embodiment] In the light source device 60 of this embodiment, the first suction member 77 and the second suction member 72 attract each other, so that the first surface 50a of the wavelength conversion member 50 and the incident end surface 52a of the angle conversion member 52 press each other, and therefore the bonded state between the wavelength conversion member 50 and the angle conversion member 52 is stably maintained, and since the first suction member 77 and the second suction member 72 are spaced apart from each other, even if the wavelength conversion member 50 expands or contracts in the X-axis direction, the generation of large stress at the bonded portion between the wavelength conversion member 50 and the angle conversion member 52 is suppressed. As a result, peeling of the angle conversion member 52 from the wavelength conversion member 50 is suppressed, and the light source device 60 that stably obtains the desired light output can be realized, which is an effect similar to that of the first embodiment.

[0106] In this embodiment, the suction force between the first suction portion 771 and the third suction portion 723 and the suction force between the second suction portion 772 and the fourth suction portion 724 act in a direction perpendicular to the opposing surface of each suction portion, that is, in a direction inclined with respect to the optical axis J. Therefore, as shown by the arrow in FIG. 9, the pressing forces F1 and F2 with which the incident end surface 52a of the angle conversion member 52 presses the first surface 50a of the wavelength conversion member 50 also act in a direction inclined with respect to the optical axis J. As a result, the pressing force F with which the incident end surface 52a of the angle conversion member 52 presses the first surface 50a of the wavelength conversion member 50 is a resultant force of the pressing forces F1 and F2, and is directed in a direction parallel to the optical axis J. In this way, the direction in which the angle conversion member 52 presses the wavelength conversion member 50 can be directed in a direction parallel to the optical axis J, so that the angle conversion member 52 can press the wavelength conversion member 50 more stably without being affected by manufacturing variations in the processed surfaces of each member.

[0107] Modifications of the light source devices 30, 40, and 60 of the above-described embodiment will be described below with reference to FIGS. 10 and 11 show examples in which the configurations of the first and second modifications are applied to the second embodiment, but these modifications are also applicable to the first and third embodiments.

[0108] (First Modification) 10, in light source device 91 of the first modification, back yokes 95 are provided on a surface of third suction portion 723 opposite to a surface facing first suction portion 751 and a surface of fourth suction portion 724 opposite to a surface facing second suction portion 752. Back yoke 95 is made of a plate material made of a magnetic metal. Back yoke 95 is accommodated in each of accommodating grooves 545, 546 together with suction portions 723, 724.

[0109] According to this configuration, the back yoke 95 is provided, thereby making it possible to increase the suction force between the first suction member 75 and the second suction member 72. In addition, since a desired suction force can be obtained even if the distance between the first suction member 75 and the second suction member 72 is increased, the assembly work of the light source device 91 can be easily performed.

[0110] (Second Modification) 11, in the light source device 92 of the second modification, buffer members 98 made of a non-magnetic material are provided between the two opposing surfaces of the first suction portion 751 and the third suction portion 723, and between the two opposing surfaces of the second suction portion 752 and the fourth suction portion 724. When the buffer members 98 are made of a material that does not elastically deform, such as hard plastic, they need not come into contact with the suction members 75, 72. On the other hand, when the buffer members 98 are made of a material that can elastically deform, such as rubber, they may come into contact with the suction members 75, 72.

[0111] According to this configuration, by providing the buffer member 98 between the two suction members 75, 72, for example, when an impact is applied to the light source device 92, the buffer member 98 can prevent the angle conversion member 52 from tilting. In particular, when the buffer member 98 is made of an elastically deformable material such as rubber and is in contact with each of the suction members 75, 72, there is no need to provide a gap between each of the suction members 75, 72, and the design and assembly work of the light source device 92 can be easily performed. In addition, because the buffer member 98 absorbs the impact, peeling of the angle conversion member 52 due to the impact can be suppressed.

[0112] 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, the suction parts are arranged in the Z-axis direction relative to the optical axis, but instead of this, the suction parts may be arranged in the Y-axis direction, or in both the Z-axis direction and the Y-axis direction. Also, the suction parts may be formed in a rectangular ring shape that is continuous in the Z-axis direction and the Y-axis direction.

[0113] In the above embodiment, the first attraction member is a metallic magnetic material and the second attraction member is a permanent magnet, but the first attraction member may be a permanent magnet and the second attraction member may be a metallic magnetic material. Alternatively, at least one of the first attraction member and the second attraction member may be an electromagnet without using a permanent magnet.

[0114] In the above embodiment, a CPC is used as the angle conversion member, but a tapered rod having a truncated pyramid shape with an exit end face area larger than the entrance end face area may be used instead of the CPC. In addition, the angle conversion member and the wavelength conversion member do not necessarily need to be joined with an adhesive, and may be configured to be in close contact only by the suction force between the first suction member and the second suction member.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] [Summary of this disclosure] The following is a summary of this disclosure.

[0120] (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 first suction member connected to the angle conversion member; a second suction member supported by the support member and disposed on a side of the first suction member on which the light guiding member is located in a direction along the optical axis of the light emitted from the light guiding 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 first and second suction members are made of magnetic material and generate an attractive force in a direction in which they attract each other, thereby applying a pressing force that presses the first surface and the incident end surface against each other.

[0121] According to the configuration of Supplementary Note 1, the first suction member and the second suction member attract each other, so that the first surface of the light guide member and the incident end surface of the angle conversion member press against each other, and the bonded state between the light guide member and the angle conversion member is stably maintained. As a result, the peeling of the angle conversion member from the light guide member is suppressed, and a light source device that can stably obtain a desired light output can be realized.

[0122] (Appendix 2) The light source device according to claim 1, wherein the first suction member and the second suction member are spaced apart from each other when an attractive force is generated in a direction in which the first suction member and the second suction member are attracted to each other.

[0123] According to the configuration of Supplementary Note 2, since the first suction member and the second suction member are separated from each other while suction forces are generated in the directions in which they attract each other, even if the light guide member expands and contracts in the longitudinal direction, the generation of large stress at the joint between the light guide member and the angle conversion member is suppressed, and as a result, peeling of the angle conversion member from the light guide member can be suppressed.

[0124] (Appendix 3) The first suction member has a first suction portion and a second suction portion, The second suction member has a third suction portion and a fourth suction portion, the first suction portion and the third suction portion face each other in a direction along the optical axis, the second suction portion and the fourth suction portion face each other in a direction along the optical axis, The light source device according to claim 1 or 2, wherein the first suction portion and the third suction portion, and the second suction portion and the fourth suction portion are arranged on opposite sides of the optical axis.

[0125] According to the configuration of Supplementary Note 3, the angle conversion member is less likely to be pressed against the light guide member in a direction inclined from the optical axis, and large shear stress is suppressed from occurring at the joint between the light guide member and the angle conversion member.

[0126] (Appendix 4) 4. The light source device according to claim 1, wherein at least one of the first suction member and the second suction member is made of a permanent magnet.

[0127] According to the configuration of Appendix 4, even when the light source device is not turned on, an attraction force is generated between the first suction member and the second suction member, so that the angle conversion member and the light-guiding member can be constantly maintained in a securely joined state.

[0128] (Appendix 5) The second attraction member is composed of a permanent magnet, The light source device according to claim 4, wherein a back yoke is provided on a surface of the second suction member opposite to a surface facing the first suction member.

[0129] According to the configuration of Supplementary Note 5, it is possible to increase the suction force between the first suction member and the second suction member. In addition, since a desired suction force can be obtained even if the distance between the first suction member and the second suction member is increased, the assembly work of the light source device can be easily performed.

[0130] (Appendix 6) 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 6. The light source device according to claim 1, wherein the first suction member is connected to the flange portion.

[0131] According to the configuration of Supplementary Note 6, the first suction member is prevented from blocking the light emitted from the angle conversion member. Also, light leakage through the first suction member can be suppressed. This makes it possible to suppress the loss of light caused by the first suction member.

[0132] (Appendix 7) 7. The light source device according to claim 6, wherein the first suction member is connected to a surface of the flange portion opposite to a surface on the exit end surface side.

[0133] According to the configuration of Supplementary Note 7, for example, when another optical system is provided at the rear stage of the light source device, the other optical system is unlikely to interfere with the first suction member. Therefore, the other optical system can be brought sufficiently close to the angle conversion member. As a result, the amount of light incident on the other optical system can be increased, and the light utilization efficiency can be improved.

[0134] (Appendix 8) The support member has an accommodation groove portion that accommodates the second suction member and an opening portion that exposes a portion of the second suction member from the accommodation groove portion, The light source device according to any one of claims 1 to 7, wherein the first suction member and the second suction member face each other across the opening.

[0135] According to the configuration of Supplementary Note 8, the distance between the first suction member and the second suction member can be narrowed, and therefore the suction force between the first suction member and the second suction member can be increased.

[0136] (Appendix 9) The light source device according to any one of claims 1 to 8, wherein a buffer member made of a non-magnetic material is provided between two opposing surfaces of the first suction member and the second suction member.

[0137] According to the configuration of Supplementary Note 9, for example, when an impact is applied to the light source device, the buffer member can prevent the angle conversion member from tilting.

[0138] (Appendix 10) 10. The light source device according to claim 9, wherein the buffer member is made of an elastically deformable material.

[0139] According to the configuration of Supplementary Note 10, the buffer member can be brought into contact with each of the first and second suction members. In this case, since there is no need to provide a gap between each suction portion, the design and assembly work of the light source device can be easily performed. In addition, since the buffer member absorbs the impact, it is possible to suppress the peeling of the angle conversion member due to the impact.

[0140] (Appendix 11) The two opposing surfaces of the first suction member and the second suction member are parallel to each other, 11. The light source device according to claim 1, wherein the opposing direction of the two surfaces is non-parallel to the direction of the optical axis.

[0141] According to the configuration of Supplementary Note 11, the direction in which the angle conversion member presses the light-guiding member can be directed parallel to the optical axis, so that the angle conversion member can press the light-guiding member more reliably without being affected by manufacturing variations in the processed surfaces of each member.

[0142] (Appendix 12) 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; 12. The light source device according to claim 1, further comprising:

[0143] According to the configuration of Addendum 12, the light-guiding member cannot easily move toward the second surface, so that the incident end face of the angle conversion member is sufficiently pressed against the first surface of the light-guiding member, thereby reliably preventing peeling of the angle conversion member.

[0144] (Appendix 13) 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 12, 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.

[0145] According to the configuration of Supplementary Note 13, it is possible to realize a light source device capable of emitting second light obtained by wavelength conversion of first light.

[0146] (Appendix 14) A light source device according to any one of claims 1 to 13, 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

[0147] According to the configuration of Supplementary Note 14, a projector capable of projecting an image with excellent display quality can be realized. [Explanation of symbols]

[0148] 1...projector, 4B, 4G, 4R...light modulation device, 6...projection optical device, 30, 40, 60, 91, 92...light source device, 50...wavelength conversion member (light guide 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 (reflecting member), 54...support member, 56...light emitting element, 58...second pressing member, 71, 75, 77... First suction member, 72...second suction member, 90...first pressing member, 95...back yoke, 96...buffer member, 521...angle conversion member main body, 522...flange portion, 545...first accommodating groove portion (accommodating groove portion), 546...second accommodating groove portion (accommodating groove portion), 54k...opening, 711, 751, 771...first suction portion, 712, 752, 772...second suction portion, 723...third suction portion, 724...fourth suction 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 first suction member connected to the angle conversion member; a second suction member supported by the support member and disposed on a side of the first suction member on which the light guiding member is located in a direction along an optical axis of the light emitted from the light guiding 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 first and second attraction members are made of magnetic material and generate an attractive force in a direction in which they attract each other, thereby applying a pressing force that presses the first surface and the incident end surface against each other.

2. The light source device according to claim 1 , wherein the first suction member and the second suction member are spaced apart from each other when an attractive force is generated in a direction in which the first suction member and the second suction member are attracted to each other.

3. The first suction member has a first suction portion and a second suction portion, The second suction member has a third suction portion and a fourth suction portion, the first suction portion and the third suction portion face each other in a direction along the optical axis, the second suction portion and the fourth suction portion face each other in a direction along the optical axis, 3 . The light source device according to claim 1 , wherein the first and third suction portions and the second and fourth suction portions are disposed on opposite sides of the optical axis. 4 .

4. 3. The light source device according to claim 1, wherein at least one of the first and second suction members is made of a permanent magnet.

5. The second attraction member is composed of a permanent magnet, The light source device according to claim 4 , further comprising a back yoke provided on a surface of the second suction member opposite to a surface facing the first suction member.

6. 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 first suction member is connected to the flange portion.

7. The light source device according to claim 6 , wherein the first suction member is connected to a surface of the flange portion opposite to a surface on the side of the light exit end surface.

8. The support member has an accommodation groove portion that accommodates the second suction member, and an opening portion that exposes a portion of the second suction member from the accommodation groove portion, The light source device according to claim 1 , wherein the first suction member and the second suction member face each other across the opening.

9. 3. The light source device according to claim 1, further comprising a buffer member made of a non-magnetic material provided between two opposing surfaces of the first suction member and the second suction member.

10. The light source device according to claim 9 , wherein the buffer member is made of an elastically deformable material.

11. two opposing surfaces of the first suction member and the second suction member are parallel to each other; 3. The light source device according to claim 1, wherein the opposing direction of the two surfaces is non-parallel to the direction of the optical axis.

12. 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:

13. 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.

14. 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