Light source device and projector

Abstract

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

Description

[[Technical Field]]

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

[0002] As a light source device for use in a projector, there has been proposed a light source device that utilizes fluorescence emitted from a phosphor when excitation light emitted from a light emitting element is irradiated onto the phosphor.

[0003] The following Patent Document 1 discloses a light source device including an excitation light source that emits excitation light, a rod-shaped phosphor that converts excitation light into fluorescence, and a heat conductive member that dissipates heat generated in the phosphor. The phosphor is disposed inside a groove of the heat conductive member. [[Prior Art Literature]] [[Patent Literature]]

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

[0005] In this type of light source device, it is conceivable that excitation light emitted from the light emitting element spreads beyond the width of the phosphor and enters the gap between the wall surface of the groove and the phosphor. However, in the light source device of Patent Document 1, since the phosphor is disposed close to one wall surface of the groove, almost no excitation light enters from the side surface of the phosphor on the side close to the wall surface. For this reason, the utilization efficiency of excitation light is lowered, and there is a risk that fluorescence having a desired intensity cannot be obtained.

[0006] Therefore, in order to improve the efficiency of utilizing the excitation light, it is conceivable to arrange the phosphor with a gap between both sides of the phosphor and the wall of the groove. In this case, however, the positional accuracy of the phosphor within the groove decreases, which reduces the efficiency of excitation light incidence on the phosphor and may prevent the acquisition of fluorescence with the desired intensity. [Means for solving the problem]

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

[0008] A projector according to one aspect of the present invention comprises a light source device according to one aspect of the present invention, an optical modulator that modulates light emitted from the light source device according to image information, and a projection optical device that projects the light modulated by the optical modulator. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows a schematic configuration of a projector according to one embodiment. [Figure 2] This is a schematic diagram of the first lighting device. [Figure 3] This is a plan view of the light source device as seen from the Y-axis direction. [Figure 4] This is a cross-sectional view of the light source device along line IV-IV in Figure 3. [Figure 5] This is a cross-sectional view of the light source device along the VV line in Figure 3. [Figure 6] This diagram shows the problems with the light source device in the comparative example. [Figure 7] This figure shows other problems with the light source device of the comparative example. [Figure 8] This is a plan view of the first modified light source device as seen from the Y-axis direction. [Figure 9] This is a plan view of the light source device of the second modified example, as seen from the Y-axis direction. [Figure 10] This is a plan view of the third modified light source device as seen from the Y-axis direction. [Figure 11] This is a plan view of the fourth modified light source device as seen from the Y-axis direction. [Figure 12A] This is a cross-sectional view of the main part showing the configuration of the retaining piece in a modified example. [Figure 12B] This diagram shows the configuration of a modified example of Figure 12A. [Figure 12C] This is a cross-sectional view of the main part showing the configuration of the retaining piece in a modified example. [Modes for carrying out the invention]

[0010] [First Embodiment] The first embodiment of the present invention will be described below. The projector of this embodiment is an example of a projector that uses a liquid crystal panel as an optical modulation device. In the following drawings, the dimensions of each component may be shown on a different scale to make them easier to see.

[0011] Figure 1 is a diagram showing the schematic configuration of the projector 1 of this embodiment. As shown in Fig. 1, the projector 1 of the present embodiment is a projection-type image display device that displays a color image on a screen SCR, which is a projection surface. The projector 1 includes three light modulation devices corresponding to respective color lights of red light LR, green light LG, and blue light LB.

[0012] The projector 1 includes a first illumination device 20, a second illumination device 21, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a light combining element 5, and a projection optical device 6.

[0013] The first illumination device 20 emits yellow fluorescence Y toward the color separation optical system 3. The second illumination device 21 emits blue light LB toward the light modulation device 4B. The detailed configurations of the first illumination device 20 and the second illumination device 21 will be described later.

[0014] Hereinafter, in the drawings, description will be given using an XYZ orthogonal coordinate system as necessary. The Z-axis is an axis along the vertical direction of the projector 1. The X-axis is an axis parallel to the optical axis AX1 of the first illumination device 20 and the optical axis AX2 of the second illumination device 21. The Y-axis is an axis orthogonal to the X-axis and the Z-axis. The optical axis AX1 of the first illumination device 20 is the central axis of the fluorescence Y emitted from the first illumination device 20. The optical axis AX2 of the second illumination device 21 is the central axis of the blue light LB emitted from the second illumination device 21. One of the two directions along the X-axis is referred to as the +X direction, and the opposite direction is referred to as the -X direction; one of the two directions along the Y-axis is referred to as the +Y direction, and the opposite direction is referred to as the -Y direction; one of the two directions along the Z-axis is referred to as the +Z direction, and the opposite direction is referred to as the -Z direction. In addition, when the two directions along the X-axis are not distinguished, they are referred to as the X-axis direction; when the two directions along the Y-axis are not distinguished, they are referred to as the Y-axis direction; when the two directions along the Z-axis are not distinguished, they are referred to as the Z-axis direction.

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

[0016] The dichroic mirror 7 separates the fluorescent 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 reflective mirror 8b is positioned in the optical path of the green light LG. The second reflective mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the optical modulator 4G. The first reflective mirror 8a is positioned in the optical path of the red light LR. The first reflective mirror 8a reflects the red light LR that has passed through the dichroic mirror 7 toward the optical modulator 4R.

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

[0018] The configuration of the second lighting device 21 will be described below. The second lighting device 21 includes a light source unit 81, a focusing lens 82, a diffuser plate 83, a rod lens 84, and a relay lens 85. The light source unit 81 is composed of at least one semiconductor laser. The light source unit 81 emits blue light LB consisting of laser light. Note that the light source unit 81 is not limited to a semiconductor laser, but may be composed of an LED that emits blue light.

[0019] The focusing lens 82 is made of a convex lens. The focusing lens 82 causes the blue light LB emitted from the light source 81 to be incident on the diffuser plate 83 in a substantially focused state. The diffuser plate 83 diffuses the blue light LB emitted from the focusing lens 82 to a predetermined degree of diffusion, generating blue light LB having a substantially uniform light distribution similar to that of the fluorescent Y emitted from the first illumination device 20. For example, frosted glass made of optical glass is used as the diffuser plate 83.

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

[0021] The blue light LB propagates through the inside of the rod lens 84 while undergoing total internal reflection, and is emitted from the light emission end face 84b with enhanced uniformity of illuminance distribution. The blue light LB emitted from the rod lens 84 is incident on the relay lens 85. The relay lens 85 causes the blue light LB, whose illuminance distribution has been made more uniform by the rod lens 84, to be incident on the reflection mirror 9.

[0022] The shape of the light-emitting end face 84b of the rod lens 84 is rectangular, which is approximately similar in shape to the image-forming region of the optical modulator 4B. As a result, the blue light LB emitted from the rod lens 84 is efficiently incident on the image-forming region of the optical modulator 4B.

[0023] Optical modulator 4R modulates red light LR according to image information to form image light corresponding to red light LR. Optical modulator 4G modulates green light LG according to image information to form image light corresponding to green light LG. Optical modulator 4B modulates blue light LB according to image information to form image light corresponding to blue light LB.

[0024] Optical modulators 4R, 4G, and 4B each utilize, for example, a transmissive liquid crystal panel. Polarizing plates (not shown) are positioned on the incident and exit sides of the liquid crystal panel, respectively. The polarizing plates allow only linearly polarized light in a specific direction to pass through.

[0025] A field lens 10R is positioned on the incident side of the optical modulator 4R. A field lens 10G is positioned on the incident side of the optical modulator 4G. A field lens 10B is positioned on the incident side of the optical modulator 4B. Field lens 10R parallelizes the principal rays of the red light LR incident on the optical modulator 4R. Field lens 10G parallelizes the principal rays of the green light LG incident on the optical modulator 4G. Field lens 10B parallelizes the principal rays of the blue light LB incident on the optical modulator 4B.

[0026] The photosynthetic element 5 receives image light emitted from the light modulators 4R, 4G, and 4B, synthesizes image light corresponding to red light LR, green light LG, and blue light LB, and emits the synthesized image light toward the projection optical device 6. For example, a cross dichroic prism is used for the photosynthetic element 5.

[0027] The projection optical device 6 is composed of multiple projection lenses. The projection optical device 6 magnifies and projects the image light synthesized by the photosynthesis element 5 toward the screen SCR. As a result, a color image is displayed on the screen SCR.

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

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

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

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

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

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

[0034] In the following explanation, when the third surface 50c, fourth surface 50d, fifth surface 50e, and sixth surface 50f are not distinguished, they may simply be referred to as sides 50c, 50d, 50e, and 50f.

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

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

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

[0038] Specifically, the material of the wavelength conversion member 50 includes, for example, a yttrium aluminum garnet (YAG) phosphor. Taking YAG:Ce, which contains cerium (Ce) as an activator, as an example, the material used for 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 performing a solid-phase reaction; Y-Al-O amorphous particles obtained by wet methods such as the coprecipitation method and the sol-gel method; or YAG particles obtained by gas-phase methods such as the spray drying method, flame decomposition method, and thermal plasma method.

[0039] The light source unit 51 comprises a substrate 55 and a light-emitting element 56. The light-emitting element 56 has a light-emitting surface 56a that emits excitation light E in the first wavelength band. The light-emitting element 56 is made of, for example, a light-emitting diode (LED). The light-emitting surface 56a of the light-emitting element 56 faces the third surface 50c of the wavelength conversion member 50 and emits excitation light E toward the third surface 50c. The first wavelength band is, for example, a wavelength band from blue to violet, from 400 nm to 480 nm, with a peak wavelength of, for example, 445 nm. Thus, the light source unit 51 is provided facing one of the four sides 50c, 50d, 50e, 50f along the longitudinal direction of the wavelength conversion member 50, specifically side 50c.

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

[0041] The support member 54 has a groove 154, which supports the wavelength conversion member 50 inside the groove 154, and also diffuses the heat generated by the wavelength conversion member 50 and releases it to the outside. For this reason, it is desirable that the support member 54 be made of a material that has a predetermined strength and high thermal conductivity. As the material of the support member 54, for example, metals such as aluminum and stainless steel can be used, and it is particularly desirable that aluminum alloys such as 6061 series be used. The specific configuration of the support member 54 will be described later.

[0042] The retaining member 65 holds the wavelength conversion member 50 outside the groove 154 of the support member 54. Therefore, the wavelength conversion member 50 does not come into contact with the wall surface of the groove 154, and a portion of it protrudes outside the groove 154 of the support member 54. The retaining member 65 holds the portion of the wavelength conversion member 50 that protrudes outside the groove 154. The retaining member 65, together with the pressing member 90, regulates the position of the wavelength conversion member 50 relative to the support member 54. The specific configuration of the retaining member 65 will be described later.

[0043] The mirror 53 is provided on the second surface 50b of the wavelength conversion member 50. The mirror 53 guides light through the interior of the wavelength conversion member 50 and reflects the fluorescent Y that reaches the second surface 50b. The mirror 53 is made of a metal film or dielectric multilayer film formed on the second surface 50b of the wavelength conversion member 50.

[0044] In the first lighting device 20, when excitation light E emitted from the light source unit 51 is incident on the wavelength conversion member 50, the phosphor contained inside the wavelength conversion member 50 is excited, and fluorescence Y is emitted from an arbitrary emission point. Fluorescence Y travels in all directions from the arbitrary emission point, but fluorescence Y directed toward the four sides 50c, 50d, 50e, and 50f travels toward the first surface 50a or the second surface 50b while undergoing repeated total internal reflection at multiple points on the sides 50c, 50d, 50e, and 50f. The first surface 50a emits fluorescence Y that has been guided through the wavelength conversion member 50 by propagation through total internal reflection. In this embodiment, fluorescence Y traveling toward the first surface 50a is incident on the angle conversion member 52 provided on the first surface 50a. Fluorescence Y traveling toward the second surface 50b is reflected by the mirror 53 and travels toward the first surface 50a.

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

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

[0047] The angle conversion member 52 has a truncated square pyramidal shape, and its cross-sectional area perpendicular to the optical axis J extends along the direction of light propagation. Therefore, the area of ​​the light emission surface 52b is larger than the area of ​​the light incident surface 52a. The optical axis J of the angle conversion member 52 is defined as the axis passing through the centers of the light emission surface 52b and the light incident surface 52a and parallel to the X-axis. The optical axis J of the angle conversion member 52 coincides with the optical axis AX1 of the first illumination device 20.

[0048] When fluorescence Y is incident on the angle conversion member 52, as it travels through the interior of the angle conversion member 52, it changes direction each time it undergoes total internal reflection at the side surface 52c, approaching a direction parallel to the optical axis J. In this way, the angle conversion member 52 converts the emission angle distribution of fluorescence Y emitted from the first surface 50a of the wavelength conversion member 50. Specifically, the angle conversion member 52 makes the maximum emission angle of fluorescence Y at the light emission surface 52b smaller than the maximum incident angle of fluorescence Y at the light incident surface 52a.

[0049] Generally, the etendu of light, which is defined by the product of the area of ​​the light emission region and the solid angle of light (maximum emission angle), is preserved. Therefore, the etendu of fluorescence Y is preserved before and after transmission through the angle conversion member 52. As described above, the angle conversion member 52 has a configuration in which the area of ​​the light emission surface 52b is larger than the area of ​​the light incident surface 52a. For this reason, from the viewpoint of etendu preservation, the angle conversion member 52 can make the maximum emission angle of fluorescence Y at the light emission surface 52b smaller than the maximum incident angle of fluorescence Y at the light incident surface 52a.

[0050] The angle conversion member 52 is fixed to the wavelength conversion member 50 via an optical adhesive (not shown) such that the light incident surface 52a faces the first surface 50a of the wavelength conversion member 50. In other words, the angle conversion member 52 and the wavelength conversion member 50 are in contact via the optical adhesive, and there is no gap (air layer) between the angle conversion member 52 and the wavelength conversion member 50. If there were a gap between the angle conversion member 52 and the wavelength conversion member 50, the fluorescent Y that reaches the light incident surface 52a of the angle conversion member 52 and is incident on the light incident surface 52a at an angle greater than or equal to the critical angle would undergo total internal reflection at the light incident surface 52a and would not be incident on the angle conversion member 52. In contrast, as in this embodiment, when there is no gap between the angle conversion member 52 and the wavelength conversion member 50, the loss component of fluorescent Y that cannot be incident on the angle conversion member 52 due to total internal reflection can be reduced. From this viewpoint, it is desirable that the refractive index of the angle conversion member 52 and the refractive index of the wavelength conversion member 50 match as much as possible.

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

[0052] A parallelization optical system 63, consisting of a collimator lens or the like, is provided between the light source device 100 and the integrator optical system 70. The parallelization optical system 63 further reduces the angular distribution of the fluorescence Y emitted from the angle conversion member 52, causing highly parallel fluorescence Y to be incident on the integrator optical system 70. Note that the parallelization optical system 63 may not be provided if the parallelism of the fluorescence Y emitted from the angle conversion member 52 is sufficiently high.

[0053] The integrator optical system 70 includes a first lens array 61 and a second lens array 101. The integrator optical system 70 functions as a uniform illumination optical system that, together with the superimposed optical system 103, homogenizes the intensity distribution of fluorescence Y emitted from the light source device 100 in the light modulation devices 4R and 4G, which are the illuminated regions. Fluorescence Y emitted from the parallelization optical system 63 is incident on the first lens array 61. The first lens array 61, together with the second lens array 101 located downstream of the light source device 100, constitutes the integrator optical system 70.

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

[0055] The fluorescence Y emitted from the first lens array 61 travels toward the second lens array 101. The second lens array 101 is positioned opposite the first lens array 61. The second lens array 101 has a plurality of second small lenses 101a corresponding to the plurality of first small lenses 61a of the first lens array 61. Together with the superimposed optical system 103, the second lens array 101 images each of the plurality of first small lenses 61a of the first lens array 61 near the image forming area of ​​the optical modulators 4R, 4G. The plurality of second small lenses 101a are arranged in a matrix in a plane parallel to the YZ plane which is perpendicular to the optical axis AX1 of the first illumination device 20.

[0056] In this embodiment, each first small lens 61a of the first lens array 61 and each second small lens 101a of the second lens array 101 have the same size, but they may also have different sizes. In addition, in this embodiment, the first small lens 61a of the first lens array 61 and the second small lens 101a of the second lens array 101 are positioned so that their optical axes coincide, but they may also be positioned eccentrically relative to each other.

[0057] The polarization conversion element 102 converts the polarization direction of the fluorescence Y emitted from the second lens array 101. Specifically, the polarization conversion element 102 is split by the first lens array 61 and converts each partial beam of fluorescence Y emitted from the second lens array 101 into linearly polarized light.

[0058] The polarization conversion element 102 includes a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the fluorescence Y emitted from the light source device 100 as is, while reflecting the other linearly polarized component in a direction perpendicular to the optical axis AX1; a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the optical axis AX1; and a phase difference plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into the other linearly polarized component.

[0059] The following describes the features of the light source device 100 of this embodiment. Figure 3 is a plan view of the light source device 100 as seen from the Y-axis direction. Figure 4 is a cross-sectional view of the light source device 100 along the line IV-IV in Figure 3. Figure 5 is a cross-sectional view of the light source device 100 along the line VV in Figure 3.

[0060] As shown in Figure 3, the support member 54 has a groove 154, a first housing portion 541, and a second housing portion 542 and the third containment section 543 , the 4th storage section 544, 5th storage section 545, 6th storage section It is a plate-like member having 546 and a rectangular planar shape.

[0061] The groove 154 extends in the X-axis direction along the longitudinal direction of the wavelength conversion member 50 and accommodates a portion of the wavelength conversion member 50. In this embodiment, the wavelength conversion member 50 protrudes outside the groove 154.

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

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

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

[0065] The second wall surface 54b has a third portion 54b3 located on the side of the third surface 50c and a fourth portion 54b4 located on the side of 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 it approaches the sixth surface 50f from the side of the third portion 54b3 toward the side of the support surface 54s. In other words, the distance between the fourth portion 54b4 and the sixth surface 50f on the side of the support surface 54s is smaller than the distance between the fourth portion 54b4 and the sixth surface 50f on the side of the third portion 54b3.

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

[0067] The dimension W1 of the light-emitting surface 56a of the light-emitting element 56 along the Z-axis direction is greater than the width B2 of the wavelength conversion member 50 along the Z-axis direction. In this embodiment, the width of the wavelength conversion member 50 along the Z-axis direction is equal throughout its entire longitudinal direction. As a result, in the Z-axis direction, both ends of the light-emitting surface 56a of the light-emitting element 56 protrude outside the third surface 50c of the wavelength conversion member 50. Specifically, both ends of the light-emitting surface 56a of the light-emitting element 56 protrude to a position that 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. In other words, when the light-emitting surface 56a is viewed from the support surface 54s along the Y-axis direction, a part of the light-emitting surface 56a overlaps with the third surface 50c, and another part of the light-emitting surface 56a overlaps with the gap between the fifth surface 50e and the first wall surface 54a and the gap between the sixth surface 50f and the second wall surface 54b.

[0068] The first width D2 of the support surface 54s of the support member 54 along the Z-axis direction is greater than the width B2 of the wavelength conversion member 50 along the Z-axis direction. As a result, in the Z-axis direction, both ends of the support surface 54s 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 portion of the support surface 54s overlaps with the fourth surface 50d, and another portion of the support surface 54s is exposed outside the fourth surface 50d. Thus, the support surface 54s has an exposed portion 54r that is exposed outside the wavelength conversion member 50.

[0069] As shown in Figures 3 to 5, the retaining member 90 restricts the position of the wavelength conversion member 50 in the Z-axis direction relative to the support member 54 within the groove 154. The retaining member 90 is made of an elastically deformable material. For example, the retaining member 90 is made of a leaf spring made of a metal material, such as stainless steel such as SUS304. However, the retaining member 90 may be made of any elastically deformable material, such as resin or rubber. However, it is desirable that the retaining member 90 be made of a material with excellent light resistance and heat resistance, such as a metal material.

[0070] As shown in Figures 3 and 5, the pressing member 90 is positioned so as not to overlap with the light-emitting element 56 of the light source unit 51 when viewed in the Y-axis direction perpendicular to the third surface 50c of the wavelength conversion member 50, and presses the wavelength conversion member 50 against the support surface 54s of the groove 154 of the support member 54. The pressing member 90 is composed of a spring member such as a leaf spring. In this way, the position of the wavelength conversion member 50 in the Z-axis direction relative to the support member 54, that is, its movement in the Z-axis direction, is restricted by the pressing member 90.

[0071] In this embodiment, the retaining member 90 is positioned in the center of the wavelength conversion member 50 in the longitudinal direction, at a location that does not overlap with the light-emitting element 56. The retaining member 90 does not necessarily have to be positioned in the center of the wavelength conversion member 50. For example, when three light-emitting elements are arranged at intervals, the retaining member is positioned in a location that does not overlap with each light-emitting element, but overlaps with the area between two light-emitting elements.

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

[0073] The first housing portion 541 is a recess that communicates with the groove portion 154 in the +X direction. The first housing portion 541 penetrates to the outer edge 540 of the support member 54. The first housing portion 541 houses the first projection 151 of the wavelength conversion member 50 that protrudes from the groove portion 154. The first housing portion 541 houses the angle conversion member 52 fixed to the first surface 50a of the wavelength conversion member 50. In this embodiment, the angle conversion member 52 is provided on the first surface 50a of the first projection 151. The light-emitting surface 52b of the angle conversion member 52 housed in the first housing portion 541 is flush with the outer edge 540 of the support member 54 when viewed from above.

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

[0075] The third housing section 543 is a recess that communicates with the first housing section 541 in the +Z direction. The third housing section 543 houses a retaining member 65 that holds the first protrusion 151 of the wavelength conversion member 50 housed in the first housing section 541.

[0076] The fourth housing section 544 is a recess that communicates with the first housing section 541 in the -Z direction. The fourth housing section 544 houses a holding member 65 that holds the first protrusion 151 of the wavelength conversion member 50 housed in the first housing section 541.

[0077] The fifth housing section 545 is a recess that communicates with the second housing section 542 in the +Z direction. The fifth housing section 545 houses a retaining member 65 that holds the second protrusion 152 of the wavelength conversion member 50 housed in the second housing section 542.

[0078] The sixth housing section 546 is a recess that communicates with the third housing section 543 in the -Z direction. The sixth housing section 546 houses a retaining member 65 that holds the second protrusion 152 of the wavelength conversion member 50 housed in the second housing section 542.

[0079] The holding member 65 holds the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50. The retaining member 65 includes a pair of first retaining pieces 651 and 652, a pair of second retaining pieces 653 and 654, and a position adjustment part 655. The first retaining piece 651 has a first retaining surface 6511 that faces a portion of the fifth surface 50e, which corresponds to the +Z direction surface of the first projection 151 of the wavelength conversion member 50. The first retaining piece 651 is housed in the third housing 543. The surface of the first projection 151 that faces the first retaining piece 651 corresponds to the fifth surface 50e. In other words, the fifth surface 50e, which is the surface of the first projection 151 that faces the first retaining piece 651, is aligned with the X axis. In this embodiment, the surface facing the first retaining piece 651 is a plane aligned with the X axis. Therefore, since the first retaining surface 6511 makes good contact with the plane fifth surface 50e, the first retaining piece 651 can easily and stably hold the +Z direction surface of the first projection 151.

[0080] The other first retaining piece 652 is positioned opposite the plane in the +Z direction of the second projection 152 of the wavelength conversion member 50. It has a first retaining surface 6521 that faces a part of the corresponding fifth surface 50e. The first retaining piece 652 is , housed in the fourth housing section 544. The second protrusion 152 is opposite the first retaining piece 652. The facing surface corresponds to the fifth surface 50e. In other words, the first retaining piece 6 in the second projection 152 The fifth surface 50e, which is the surface opposite to 52, is aligned with the X-axis. In this embodiment, the first retainer The fifth surface 50e, which is opposite to piece 652, is a plane along the X-axis. Therefore, the first retaining surface 6521 Since it makes good contact with the fifth surface 50e which is flat, the first retaining piece 65 2 This is the second protruding part The 152-degree +Z plane can be held easily and stably.

[0081] The second retaining piece 653 has a second retaining surface 6531 that faces a portion of the sixth surface 50f, which corresponds to the -Z direction surface of the first projection 151 of the wavelength conversion member 50. The second retaining piece 653 is housed in the fifth housing 545. The second retaining piece 653 is positioned in a predetermined location within the fifth housing 545 by being inserted into a pair of positioning pins 6530. The second retaining piece 653 is fixed to the support member 54 via a screw 6533. The surface of the first projection 151 facing the second retaining piece 653 corresponds to the sixth surface 50f. In other words, the sixth surface 50f, which is the surface of the first projection 151 facing the second retaining piece 653, is aligned with the X-axis. In this embodiment, the sixth surface 50f, which is the surface facing the second retaining piece 653, is a plane aligned with the X-axis. Therefore, since the second retaining surface 6531 makes good contact with the plane sixth surface 50f, the second retaining piece 653 can easily and stably hold the surface of the first projection 151 in the -Z direction.

[0082] The other second retaining piece 654 has a second retaining surface 6541 that faces a portion of the sixth surface 50f, which corresponds to the -Z direction surface of the second projection 152 of the wavelength conversion member 50. The second retaining piece 654 is housed in the sixth housing 546. The second retaining piece 654 is positioned in a predetermined location within the sixth housing 546 by being inserted into a pair of positioning pins 6540. The second retaining piece 654 is fixed to the support member 54 via screws 6543. The surface of the second projection 152 facing the second retaining piece 654 corresponds to the sixth surface 50f. In other words, the sixth surface 50f, which is the surface of the second projection 152 facing the second retaining piece 654, is aligned with the X-axis. In this embodiment, the surface facing the second retaining piece 654 is a plane aligned with the X-axis. Therefore, since the second retaining surface 6541 makes good contact with the plane sixth surface 50f, the second retaining piece 654 can easily and stably hold the -Z direction surface of the second projection 152.

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

[0084] It is desirable that the above-mentioned interval L1 be narrower than the first width D2 and equal to the second width B2. However, it is possible that variations in the second width B2 may occur due to manufacturing tolerances, for example, and that the above-mentioned interval L1 and the second width B2 may not match. In response to this, the light source device 100 of this embodiment allows the above-mentioned interval L1 to be adjusted by the position adjustment unit 655 described later.

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

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

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

[0088] Based on this configuration, the position adjustment unit 655 adjusts the Z of the first retaining pieces 651 and 652. The axial position is adjustable. The positions of the first retaining pieces 651 and 652 change in the Z-axis direction. When converted, the first retaining surface 6511 of the first retaining piece 651 and the first retaining surface of the first retaining piece 652 The position of 6521 changes in the Z-axis direction. As a result, the first retaining surface 65 of the first retaining piece 651 11 makes good contact with the fifth surface 50e which forms the first protrusion 151 of the wavelength conversion member 50, The first retaining surface 6521 of the first retaining piece 652 forms the second projection 152 of the wavelength conversion member 50. It can make good contact with the five surfaces 50e. That is, the first retaining pieces 651 and 652 First holding surface 6511, 652 1 and the second retaining surfaces 6531, 65 of the second retaining pieces 653, 654 The distance L1 between 41 and the first projection 15 is narrower than the first width D2 of the support surface 54s of the groove 154. The width of the second protrusion 1 and the second protrusion 152 can be set to be equivalent to the second width B2.

[0089] Therefore, the first protrusion 151 is held between the first holding surface 6511 and the second holding surface 6531, and the second protrusion 152 is held between the first holding surface 6521 and the second holding surface 6541. In this way, the holding member 65 of this embodiment can hold the wavelength conversion member 50 within the groove 154 while restricting its movement in the Z-axis direction by holding the protrusions of the wavelength conversion member 50 that protrude outside the groove 154.

[0090] Here, we will specifically describe how to install the wavelength conversion member 50 in the groove 154 of the support member 54. First, the support member 54 is prepared with the holding member 65 removed, and the wavelength conversion member 50 is installed inside the groove 154. At this time, the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 are positioned to protrude outside the groove 154. The angle conversion member 52 and the mirror 53 may be fixed to the wavelength conversion member 50 in advance, or they may be fixed after the installation inside the groove 154 is completed.

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

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

[0093] Next, the position in the Z-axis direction is adjusted by sliding the first retaining piece 651 along the first rail 6551, bringing the first retaining surface 6511 of the first retaining piece 651 into contact with the fifth surface 50e that forms the first projection 151 of the wavelength conversion member 50. Similarly, the position in the Z-axis direction is adjusted by sliding the first retaining piece 652 along the second rail 6552, bringing the first retaining surface 6521 of the first retaining piece 652 into contact with the fifth surface 50e that forms the second projection 152 of the wavelength conversion member 50. Finally, the first screws 6571 and 6572 are tightened to fix the first retaining pieces 651 and 652 to the support member 54, respectively. This causes the fifth surface 50e of the wavelength conversion member 50 to be separated from the first wall surface 54a of the groove 154. Finally, the wavelength conversion member 50 is pressed against the support member 54 via the pressing member 90. In this way, the installation of the support member 54 into the groove 154 of the wavelength conversion member 50 is completed.

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

[0095] In the light source device 100 of this embodiment, the position of the wavelength conversion member 50 in the X-axis direction is restricted by the holding member 65, which holds the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 outside the groove 154. As a result, the wavelength conversion member 50 can be accurately positioned inside the groove 154. Thus, the state in which the fifth surface 50e of the wavelength conversion member 50 is spaced apart from the first wall surface 54a of the groove 154, and the sixth surface 50f of the wavelength conversion member 50 is spaced apart from the second wall surface 54b of the groove 154, is stably maintained. Therefore, the excitation light E emitted from the light-emitting element 56 is incident not only on the third surface 50c of the wavelength conversion member 50, but also on the fifth surface 50e and the sixth surface 50f. As a result, compared to conventional light source devices in which the wavelength conversion member is positioned close to one wall surface of the groove, the utilization efficiency of the excitation light E can be increased, and fluorescence Y with the desired intensity can be obtained.

[0096] Even if the wavelength conversion member 50 can be positioned with its side surface spaced apart from the wall surface of the groove 154, if the holding member 65 of this embodiment were not present, as shown in Figure 6, the wavelength conversion member 50 could be obliquely shifted with respect to the optical axis J inside the groove 154 of the support member 54. In this case, the direction of propagation of the fluorescence Y emitted from the light source device 200 would be shifted, causing problems such as the fluorescence Y being incident on the optical system downstream of the light source device 200 at a wider angle than expected, or in some cases, the fluorescence Y not being incident on the optical system downstream of the light source device 200 at all. Alternatively, as shown in Figure 7, the corner of the wavelength conversion member 50 could ride up onto the first wall surface 54a or the second wall surface 54b of the groove 154 of the support member 54. In this case, the fourth surface 50d of the wavelength conversion member 50 would be separated from the support surface 54s of the support member 54, so the heat from the wavelength conversion member 50 would not be sufficiently transferred to the support member 54, which could reduce the wavelength conversion efficiency.

[0097] To address these problems, the light source device 100 of this embodiment maintains the wavelength conversion member 50 in a state where it is positioned approximately in the center of the groove 154 in the Z-axis direction, as its position in the Z-axis direction is restricted by the holding member 65. Therefore, since the direction of propagation of the fluorescence Y emitted from the light source device 100 coincides with the optical axis J, fluorescence Y with a desired incidence angle and desired light intensity can be incident on the optical system downstream of the light source device 100. In addition, the corners of the wavelength conversion member 50 are prevented from riding up onto the first wall surface 54a or the second wall surface 54b of the groove 154. As a result, heat from the wavelength conversion member 50 is sufficiently transferred to the support member 54, and the desired wavelength conversion efficiency can be maintained.

[0098] According to the light source device 100 of this embodiment, as shown in Figure 4, some of the excitation light E2 emitted from the light-emitting surface 56a of the light-emitting element 56 travels through the gap between the fifth surface 50e and the first portion 54a1 of the wavelength conversion member 50, and then incident on the second portion 54a2 which is inclined with respect to the support surface 54s. At this time, the excitation light E2 is reflected by the second portion 54a2 and incident on 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 be incident on the fifth surface 50e, thus reducing the amount of excitation light E that is reflected by the support surface 54s and returns to the light source unit 51. In addition, some of the excitation light E is reflected by the first portion 54a1 which extends perpendicular to the support surface 54s and incident on the fifth surface 50e of the wavelength conversion member 50. As a result, a light source device 100 can be realized that has high utilization efficiency of excitation light E and makes it easy to obtain fluorescence Y with the desired intensity.

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

[0100] [First variation] Modified examples of this embodiment will be described below. Figure 8 is a plan view of the first modified light source device 110 as seen from the Y-axis direction. The difference between this modified version and the above embodiment is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are denoted by the same reference numerals, and their descriptions are omitted.

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

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

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

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

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

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

[0107] In this modified light source device 110, the same effects as in the above embodiment can be obtained, such as increased utilization efficiency of excitation light and securing the desired wavelength conversion efficiency, thereby obtaining fluorescence with the desired intensity and allowing the desired fluorescence to be incident on the optical system downstream of the light source device 110. In this modified example, the retaining member 165 may be modified by omitting either the first spring member 1653 or the second spring member 1654.

[0108] [Second variation] Figure 9 is a plan view of the second modified light source device 120 as seen from the Y-axis direction. The difference between this modified version and the above embodiment is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0109] As shown in Figure 9, the holding member 265 in the second modified light source device 120 is a pair It comprises retaining pieces 2651 and 2652, and a spring member 2653. The first retaining piece 2651 corresponds to the plane in the +Z direction of the first projection 151 of the wavelength conversion member 50. It holds a portion of the fifth surface 50e. The first retaining piece 2651 is attached to the support member via a screw (not shown). It is fixed at 54. The first retaining piece 2652 corresponds to the plane in the +Z direction of the second projection 152 of the wavelength conversion member 50. It holds a portion of the fifth surface 50e. The first retaining piece 2652 is attached to the support member via a screw (not shown). It is fixed at 54. The spring member 2653 corresponds to the -Z direction plane of the first projection 151 of the wavelength conversion member 50. Press down on a portion of the 50f section of the 6th surface. .Ba Member 2 653 is, for example, made of a leaf spring, and the spring The pressing force causes the fifth surface 50e of the first projection 151 to be pressed against the first retaining pieces 2651 and 2652. The spring member 2653 is displaceable in the Z-axis direction, thus allowing for position adjustment of the above embodiment. Even without providing a section, contact can be made with the sixth surface 50f of the first protrusion 151.

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

[0111] According to the retaining member 265 of this modified example, the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 can be held in a simple configuration by utilizing the pressing force of the spring member. Alternatively, the position of the spring member 2653 may be changed to press a part of the sixth surface 50f corresponding to the -Z direction surface of the second protrusion 152 of the wavelength conversion member 50.

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

[0113] In this modified light source device 120, the same effects as in the above embodiment can be obtained, such as increased utilization efficiency of excitation light and securing the desired wavelength conversion efficiency, thereby obtaining fluorescence with the desired intensity and allowing the desired fluorescence to be incident on the optical system downstream of the light source device 120.

[0114] [Third variation] Figure 10 is a plan view of the third modified light source device 130 as seen from the Y-axis direction. The difference between this modified version and the second modified version described above is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0115] As shown in Figure 10, the holding member 365 in the third modified light source device 130 has a single holding piece 3650 and a spring member 2653. The holding piece 3650 in this modified example is formed by integrally forming the first holding pieces 2651 and 2652 of the second modified example. The holding piece 3650 in this modified example has a main body portion 3650a extending along the longitudinal side of the wavelength conversion member 50, a first convex portion 3650b that is provided projecting in the -Z direction from the +X end of the main body portion 3650a and holds a part of the fifth surface 50e of the first projection 151, and a second convex portion 3650c that is provided projecting in the -Z direction from the -X end of the main body portion 3650a and holds a part of the fifth surface 50e of the second projection 152.

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

[0117] According to the retaining member 365 of this modified example, the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 can be held in a simple configuration by using the pressing force of the spring member 2653 and the retaining piece 3650. Alternatively, the position of the spring member 2653 may be changed to press a part of the sixth surface 50f corresponding to the -Z direction surface of the second protrusion 152 of the wavelength conversion member 50. In this modified example, the retaining member 365 can be treated as a single unit with the first retaining pieces 2651 and 2652 of the second modified example, thus facilitating the assembly of the light source device 130.

[0118] In this modified light source device 130, the utilization efficiency of the excitation light is also increased, and the desired wavelength conversion effect is achieved. Light source device 1: Since the ratio can be ensured, fluorescence with the desired intensity can be obtained. 3 Optics after 0 The same effects as in the above embodiment can be obtained, such as being able to inject the desired fluorescence onto the target. It is possible.

[0119] [Fourth variation] Figure 11 is a plan view of the fourth modified light source device 140 as seen from the Y-axis direction. The difference between this modified version and the above embodiment is the configuration of the holding member. In the following drawings, components common to the light source device 100 of the above embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0120] As shown in Figure 11, the holding member 465 in the fourth modified example of the light source device 140 has a first holding piece 4651 and a pair of second holding pieces 4652 and 4653. The first retaining piece 4651 holds a portion of the fifth surface 50e of the second projection 152 of the wavelength conversion member 50, which corresponds to the surface in the +Z direction. The first retaining piece 4651 is fixed to the support member 54 via a screw (not shown) such that a predetermined pressing force is applied to the fifth surface 50e of the second projection 152.

[0121] The second retaining piece 4652 holds a portion of the sixth surface 50f of the first projection 151 of the wavelength conversion member 50, which corresponds to the -Z direction surface. The second retaining piece 4652 is fixed to the support member 54 via a screw (not shown) such that a predetermined pressing force is applied to the sixth surface 50f of the first projection 151.

[0122] The other second retaining piece 4653 holds a portion of the sixth surface 50f of the second projection 152 of the wavelength conversion member 50, which corresponds to the -Z direction surface. The second retaining piece 4653 is fixed to the support member 54 via a screw (not shown) such that a predetermined pressing force is applied to the sixth surface 50f of the second projection 152.

[0123] In this modified example, the holding position of the fifth surface 50e of the second projection 152 by the first holding piece 4651 and the holding position of the sixth surface 50f of the second projection 152 by the second holding piece 4653 are offset in the X-axis direction. Specifically, the holding position by the first holding piece 4651 is located on the +X side than the holding position by the second holding piece 4653. In other words, the holding member 465 in this modified example is configured to hold the wavelength conversion member 50 at three points in the longitudinal direction.

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

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

[0126] In this modified light source device 140, the same effects as in the above embodiment can be obtained, such as increased utilization efficiency of excitation light and securing the desired wavelength conversion efficiency, thereby obtaining fluorescence with the desired intensity and allowing the desired fluorescence to be incident on the optical system downstream of the light source device 140.

[0127] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. Furthermore, one aspect of the present invention can be a configuration that appropriately combines the characteristic features of the embodiments and modifications described above.

[0128] In the above embodiments and modifications, an example was given in which the retaining piece that abuts the sides of the first protrusion 151 and the second protrusion 152 of the wavelength conversion member 50 applies force only in the Z-axis direction. However, the configuration of the retaining piece is not limited to this. The retaining piece may also be configured to apply a pressing force in the -X direction, not only in the Z-axis direction, but also simultaneously press the wavelength conversion member 50 against the support surface 54s of the groove 154. The configuration of the retaining piece capable of applying the above-mentioned pressing force in the Z-axis direction and the -X direction will be described below with reference to Figures 12A, 12B, and 12C. In Figures 12A, 12B, and 12C, an example is given of a retaining piece that holds the fifth surface 50e side of the second protrusion 152 of the wavelength conversion member 50. However, this can also be applied to a retaining piece that holds the sixth surface 50f side of the second protrusion 152 and the first protrusion 151, or to the spring member of the above modifications.

[0129] The retaining piece 5650 of the retaining portion 565 shown in Figure 12A has a retaining surface 5651 that holds the corner 50R of the second projection 152 of the wavelength conversion member 50. The corner 50R is the part where the fifth surface 50e and the third surface 50c intersect. The retaining surface 5651 of the retaining piece 5650 presses the corner 50R against the support surface 54s from diagonally above to diagonally below, that is, in the -Z direction and the +Y direction. Therefore, the retaining surface 5651 holds the second projection 152 in the -Z direction and generates a force that presses it against the support surface 54s. With a retaining piece 5650 having such a retaining surface 5651, the wavelength conversion member 50 can be held in a more stable state.

[0130] Furthermore, when external forces are applied, the corner 50R of the wavelength conversion member 50 may rub against the holding surface 5651, potentially causing chipping of the corner 50R. To address this, as shown in Figure 12B, chipping of the corner 50R can be prevented by providing a cushioning material 5653 between the holding surface 5651 and the corner 50R.

[0131] Furthermore, the retaining piece 6650 of the retaining portion 665 shown in Figure 12C has a first contact portion 6651, a second contact portion 6652, and a main body portion 6653. The main body portion 6653 has a rectangular cross-sectional shape and is integrally formed with the first contact portion 6651 and the second contact portion 6652. The first contact portion 6651 extends from the main body portion 6653 in the -Z direction, and its tip contacts the fifth surface 50e of the second projection 152 of the wavelength conversion member 50. The second contact portion 6652 extends from the main body portion 6653 in the -Z direction, and then its tip, which is bent toward the -Y side, contacts the third surface 50c of the second projection 152 of the wavelength conversion member 50. The tips of the first contact portion 6651 and the second contact portion 6652 are chamfered. The retaining piece 6650 holds the second projection 152 in the -Z direction by the first contact portion 6651 and generates a force that presses the second projection 152 against the support surface 54s by the second contact portion 6652. With such a retaining piece 6650, the wavelength conversion member 50 can be held in a more stable state. In addition, since it does not come into contact with the corner 50R of the wavelength conversion member 50, chipping of the corner 50R can be suppressed.

[0132] In the above embodiment of the light source device 100, the example given is that the wavelength conversion member 50 has protrusions on both the first surface 50a and the second surface 50b in the X-axis direction. However, the protrusions may be provided on only one of the first surface 50a and the second surface 50b in the X-axis direction. In this case, the holding member is arranged only on the side where the protrusions are provided.

[0133] In the above embodiment of the light source device 100, an example was given in which the spacing L1 is set to be narrower than the first width D2 and equal to the second width B2. However, the spacing L1 may also be set to be narrower than the first width D2 and wider than the second width B2. When the spacing L1 is set to be wider than the second width B2 in this way, a small amount of play can be provided between the holding member 65 and the wavelength conversion member 50, thereby preventing problems such as deformation or damage to the wavelength conversion member 50 due to stress being applied to the contact area between the holding member 65 and the wavelength conversion member 50. Note that if the spacing L1 is narrower than the first width D2 of the support surface 54s of the groove 154, the wavelength conversion member 50 will not come into contact with the wall surface of the groove 154.

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

[0135] In the above embodiment, an example was given in which an angle conversion member 52 is separately provided on the first surface 50a, which is the light emission surface of the wavelength conversion member 50. However, the angle conversion member 52 does not have to be provided. In this case, a truncated square pyramidal emission portion with a cross-sectional area perpendicular to the optical axis that widens along the direction of light propagation may be integrally formed on the light emission side of the wavelength conversion member.

[0136] In the above embodiment, an example was given in which the present invention is applied to a light source device equipped with a wavelength conversion member. However, instead of this configuration, the present invention may also be applied to a light source device that propagates incident light and then emits it, for example, by controlling the angular distribution, without wavelength conversion. In that case, the wavelength conversion member of the above embodiment is replaced by a light guide member, and the light emitted from the light-emitting element is emitted from the angle conversion member as light in its original wavelength band.

[0137] Furthermore, the specific details regarding the shape, number, arrangement, materials, etc., of each component of the light source device and projector are not limited to the above embodiments and can be modified as appropriate. Also, although the above embodiments show an example in which the light source device according to the present invention is mounted on a projector using a liquid crystal panel, it is not limited to this. The light source device according to the present invention may also be applied to a projector using a digital micromirror device as an optical modulator. Moreover, the projector does not have to have multiple optical modulators, but may have only one optical modulator.

[0138] The above embodiment shows an example of applying the light source device of the present invention to a projector, but it is not limited to this. The light source device of the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

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

[0140] In this light source device configuration, the position of the light guide member in the third axial direction is restricted by the holding member holding the protruding portion of the light guide member outside the groove. Therefore, the light guide member can be precisely positioned inside the groove. Thus, the state in which the fifth surface of the light guide member is spaced apart from the first wall surface of the groove and the sixth surface of the wavelength conversion member is spaced apart from the second wall surface of the groove is stably maintained. Therefore, the light emitted from the light-emitting element is incident not only on the third surface of the light guide member, but also on the fifth and sixth surfaces. As a result, compared to conventional light source devices in which the light guide member is positioned close to one wall of the groove, the light utilization efficiency can be increased, and light with the desired intensity can be obtained.

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

[0142] In this configuration, the vicinity of the first surface of the first protrusion on which the angle-changing member is provided is held by the holding member. Therefore, impacts from external forces, etc., on the fixed portion between the angle-changing member and the first surface can be mitigated. Thus, the strength of the fixed portion between the angle-changing member and the first surface can be increased, providing a light source device with excellent impact resistance.

[0143] (Note 3) The light guide member has a second projection including the second surface, The light source device as described in Appendix 2, wherein the second surface of the second protrusion is provided with a mirror that reflects light guiding through the interior of the light guide member.

[0144] With this configuration, the vicinity of the second surface of the second protrusion on which the mirror is provided is held. Therefore, by holding both ends of the light guide member in the longitudinal direction, vibrations of the light guide member caused by impacts from external forces can be reduced.

[0145] (Note 4) The light source device according to any one of the appendices 1 to 3, wherein the retaining member comprises a first retaining piece that holds the fifth side of the protrusion and a second retaining piece that holds the sixth side of the protrusion.

[0146] With this configuration, the fifth and sixth surfaces of the protruding portion can be held from both sides. Therefore, the light guide member can be held securely in the direction along the third axis.

[0147] (Note 5) The light source device according to Appendix 4, wherein the distance along the third axis between the first retaining surface of the first retaining piece and the second retaining surface of the second retaining piece is narrower than the first width along the third axis of the support surface of the groove, and equal to or wider than the second width along the third axis of the protruding portion.

[0148] In this configuration, the wavelength conversion member, whose protrusion is held by the first and second retaining pieces, has a fifth surface separated from the first wall surface of the groove and a sixth surface separated from the second wall surface of the groove. When the distance between the first and second retaining surfaces is equal to the second width, the position of the wavelength conversion member in the third axial direction can be fixed. Furthermore, when the distance between the first and second retaining surfaces is wider than the second width, a small amount of play can be provided between the retaining member and the light guide member, thereby preventing deformation or damage to the light guide member due to stress being applied to the contact area between the retaining member and the light guide member.

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

[0150] This configuration allows for adjustment of the third axial position of at least one of the first retaining piece and the second retaining piece. This makes it possible to set the distance between the first retaining surface of the first retaining piece and the second retaining surface of the second retaining piece to be narrower than the first width of the groove and equal to or wider than the second width of the protrusion.

[0151] (Note 7) The first wall surface has a first portion located on the third surface side and a second portion located on the support surface side, the first portion extending in a direction perpendicular to the support surface, and the second portion inclined to approach the fifth surface as it moves from the first portion side toward the support surface side. The second wall surface has a third portion located on the third surface side and a fourth portion located on the support surface side, the third portion extending in a direction perpendicular to the support surface, and the fourth portion inclined to approach the sixth surface as it moves from the third portion side toward the support surface side. The first part, the second part, the third part, and the fourth part reflect at least a portion of the light emitted from the light-emitting element, according to any one of the appendices 1 to 6.

[0152] In this configuration, some of the light emitted from the light-emitting element travels through the gap between the fifth surface and the first portion of the light guide member, and then enters the second portion, which is inclined with respect to the support surface. At this time, the light is reflected by the second portion and enters the fifth surface of the light guide member. In this way, the light passing through the gap between the fifth surface and the first wall surface of the light guide member is more likely to enter the fifth surface, thus reducing the amount of light that is reflected by the support surface and returns to the light-emitting element side. In addition, some of the light is reflected by the first portion, which extends perpendicular to the support surface, and enters the fifth surface of the light guide member. As a result, a light source device with high light utilization efficiency and that can easily obtain light of the desired intensity can be realized.

[0153] (Note 8) The light source device according to any one of the appendices 1 to 7, wherein the surface of the protruding portion facing the holding member is aligned with the first axis.

[0154] With this configuration, when the holding surface of the protrusion by the holding member is aligned with the first axis, the holding portion can make better contact with the protrusion compared to when the holding surface is inclined with respect to the first axis. Therefore, the holding member can stably hold the protrusion.

[0155] (Note 9) The light-emitting element emits first light having a first wavelength band, The light source device according to any one of the appendices 1 to 8, wherein the light guide member includes a phosphor and is a wavelength conversion member that converts the first light emitted from the light-emitting element into second light having a second wavelength band different from the first wavelength band, and emits the second light.

[0156] This configuration makes it possible to realize a light source device that has high utilization efficiency for the first light and obtains a second light with the desired intensity.

[0157] (Note 10) A light source device described in any one of the appendices 1 to 9, A light modulator that modulates the light emitted from the light source device according to image information, A projection optical device that projects light modulated by the aforementioned optical modulation device, A projector equipped with [a specific feature].

[0158] This projector configuration, equipped with the above-mentioned light source device, provides a projector with excellent light utilization efficiency. [Explanation of Symbols]

[0159] 1...Projector, 4B, 4G, 4R...Optical Modulator, 6...Projection Optical Device, 50...Wavelength Conversion Member (Light Guide Member), 50a...First Surface, 50b...Second Surface, 50c...Third Surface, 50d...Fourth Surface, 50e...Fifth Surface, 50f...Sixth Surface, 52...Angle Conversion Member, 53...Mirror, 54...Support Member, 54a...First Wall Surface, 54b...Second Wall Surface, 54s...Support Surface, 56...Light Emitting Device, 65, 165, 265, 365, 465...Holding Member, 100, 110, 120, 130, 140, 200...Light Source Device, 151...Number 1 protrusion, 152...second protrusion, 154...groove, 54a1...first part, 54a2...second part, 54b3...third part, 54b4...fourth part, 651,652,1651,2651,2652,4651...first holding piece, 653,654,1652 ,4652,4653...second holding piece, 655...position adjustment unit, 6511,6521...first holding surface, 6531,6541...second holding surface, B2...second width, B2...width, D2...first width, L1...interval, E, E2...excitation light (first light), Y...fluorescence (second light).

Claims

1. A light-emitting element that emits light, A light guide member into which the light emitted from the light-emitting element is incident, A support member having a groove, and the inside of the groove supporting the light guide member, A holding member that holds the light guide member outside the groove of the support member, Equipped with, The light guide member has a first surface and a second surface located on opposite sides of a first axis along the longitudinal side of the light guide member, a third surface and a fourth surface located on opposite sides of a second axis intersecting the first axis, and a fifth surface and a sixth surface located on opposite sides of a third axis intersecting the first and second axes. The first surface of the light guide member emits light that has been guided by the light guide member. The light-emitting element is provided facing the third surface, The groove portion has a support surface facing the fourth surface, a first wall surface facing the fifth surface and spaced apart from the fifth surface, and a second wall surface facing the sixth surface and spaced apart from the sixth surface. The light guide member has a protruding portion at least one of its ends on the first axis that protrudes outside the groove, The holding member holds the light guide member by holding the protruding portion outside the groove, so that the fifth surface and the sixth surface are spaced apart from the first wall surface and the second wall surface, respectively. The light-emitting surface of the light-emitting element has a dimension along the third axis that is greater than the width of the light guide member along the third axis, and when viewed along the second axis, a portion of the light-emitting surface overlaps with the third surface, and another portion of the light-emitting surface overlaps with the gap between the fifth surface and the first wall surface, and the gap between the sixth surface and the second wall surface. A light source device wherein the first and second wall surfaces have light reflectivity that reflects the light incident on the gap and causes it to enter the light guide member from the fifth and sixth surfaces.

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

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

4. The light source device according to any one of claims 1 to 3, wherein the holding member comprises a first holding piece that holds the fifth side of the protrusion and a second holding piece that holds the sixth side of the protrusion.

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

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

7. The first wall surface has a first portion located on the third surface side and a second portion located on the support surface side, the first portion extending in a direction perpendicular to the support surface, and the second portion inclined to approach the fifth surface as it moves from the first portion side toward the support surface side. The second wall surface has a third portion located on the third surface side and a fourth portion located on the support surface side, the third portion extending in a direction perpendicular to the support surface, and the fourth portion inclined to approach the sixth surface as it moves from the third portion side toward the support surface side. The light source device according to any one of claims 1 to 3, wherein the first part, the second part, the third part, and the fourth part reflect at least a portion of the light emitted from the light-emitting element.

8. The light source device according to any one of claims 1 to 3, wherein the surface of the protruding portion facing the holding member is aligned with the first axis.

9. The light-emitting element emits first light having a first wavelength band, The light source device according to any one of claims 1 to 3, wherein the light guide member includes a phosphor and is a wavelength conversion member that converts the first light emitted from the light-emitting element into a second light having a second wavelength band different from the first wavelength band, and emits the second light.

10. A light source device according to any one of claims 1 to 3, A light modulator that modulates the light emitted from the light source device according to image information, A projection optical device that projects light modulated by the aforementioned optical modulation device, A projector equipped with [a specific feature].

Images