Light source device and projector

Abstract

To provide a light source device and a projector capable of suppressing deterioration of wavelength conversion efficiency and suppressing deterioration of image quality.SOLUTION: A light source device according to an aspect of the invention includes a light source unit including a light emitting element that emits light, a light guide member on which the light emitted from the light emitting element is incident and which emits light, a support member that supports the light guide member, a pressing unit that presses the light guide member against the support member, a measurement unit that measures a characteristic value correlated with a temperature of the light guide member, a control unit that acquires the characteristic value measured by the measurement unit, and a temperature adjustment unit that adjusts the temperature of the light guide member, in which the control unit controls the temperature adjustment unit based on the characteristic value.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] As a light source device used in a projector, a light source device has been proposed that emits fluorescence from a phosphor when the phosphor is irradiated with excitation light emitted from a light-emitting element. Patent Document 1 listed below discloses a light source device that includes a light source element that emits excitation light and a wavelength conversion member that contains a phosphor that converts the excitation light into fluorescence. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-108325 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in Patent Document 1, when the phosphor contained in the wavelength conversion member absorbs excitation light, the temperature of the wavelength conversion member rises. If the temperature of the wavelength conversion member becomes too high, there is a risk that thermal quenching of fluorescence in the wavelength conversion member will increase. As a result, there is a risk that the wavelength conversion efficiency, which is the efficiency with which the wavelength conversion member converts excitation light into fluorescence, will decrease. Furthermore, if the temperature of the wavelength conversion member becomes too high, there is a risk that the color gamut of the fluorescence emitted by the wavelength conversion member will decrease. As a result, there is a risk that the quality of the image projected by the projector will decrease. [Means for solving the problem]

[0005] In order to solve the above problems, a light source device according to one aspect of the present invention includes a light source unit having a light-emitting element that emits light, a light-guiding member that receives the light emitted from the light-emitting element and emits the light from the light-guiding member, a support member that supports the light-guiding member, a pressing unit that presses the light-guiding member against the support member, a measurement unit that measures a characteristic value that correlates with the temperature of the light-guiding member, a control unit that acquires the characteristic value measured by the measurement unit, and a temperature adjustment unit that adjusts the temperature of the light-guiding member, and the control unit controls the temperature adjustment unit based on the characteristic value.

[0006] 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 modulation device that modulates light emitted from the light source device, and a projection optical device that projects the light modulated by the optical modulation device. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic configuration diagram of a projector according to an embodiment. [Figure 2] FIG. 2 is a schematic configuration diagram of a first lighting device. [Figure 3] FIG. 2 is a plan view of the light source device as seen from the incident direction. [Figure 4] 4 is a cross-sectional view of the light source device taken along line IV-IV in FIG. 3. [Figure 5] 4 is a cross-sectional view of the light source device taken along line VV in FIG. 3. [Figure 6] FIG. 10 is a diagram illustrating a wavelength spectrum of a second light. [Figure 7] 10 is a flowchart showing temperature control. [Figure 8] FIG. 4 is a cross-sectional view of a light source device according to a first modified example of the embodiment. [Figure 9] FIG. 10 is a cross-sectional view of a light source device according to a second modified example of the embodiment. [Figure 10] FIG. 10 is a schematic configuration diagram of a first lighting device according to a second embodiment. [Figure 11] 10 is a flowchart showing temperature control according to a second embodiment. [Figure 12] FIG. 10 is a schematic configuration diagram of a first lighting device according to a third embodiment. [Figure 13] 10 is a flowchart showing temperature control according to a third embodiment. [Figure 14] FIG. 11 is a diagram showing the transition of the air flow rate in the third embodiment. [Figure 15] FIG. 11 is a diagram showing temperature transitions of a light guide member according to a third embodiment. [Figure 16] FIG. 10 is a schematic configuration diagram of a first lighting device according to a fourth embodiment. [Figure 17] 10 is a flowchart showing temperature control according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described. The projector of this embodiment is an example of a projector that uses a liquid crystal panel as a light modulation device. In the drawings below, the dimensions of some components may be shown on different scales to make them easier to see.

[0009] In the following drawings, an XYZ Cartesian coordinate system will be used as necessary. The X axis is an axis that extends in the direction in which the light guide member of the embodiment described below extends. In the following description, the direction in which the X axis extends (X-axis direction) may be referred to as the "longitudinal direction." The Z axis is an axis that runs along the up-down direction of the projector. In the following description, the direction in which the Z axis extends is referred to as the Z-axis direction. The Y axis is an axis that is perpendicular to both the X axis and the Z axis. In the following description, the direction in which the Y axis extends (Y-axis direction) may be referred to as the "incident direction." The incident direction is the direction in which the first light enters the light guide member. The incident direction is also the direction in which the light source unit emits the first light, i.e., light. In the following description, the side in which the X axis arrow points is referred to as the +X side and the opposite side is referred to as the -X side, the side in which the Y axis arrow points is referred to as the +Y side and the opposite side is referred to as the -Y side, and the side in which the Z axis arrow points is referred to as the +Z side and the opposite side is referred to as the -Z side.

[0010] (First embodiment) FIG. 1 is a schematic configuration diagram of a projector 1 according to this embodiment. As shown in FIG. 1, the projector 1 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 4R, 4G, and 4B corresponding to red light LR, green light LG, and blue light LB. The projector 1 also includes a first illumination device 20, a second illumination device 80, a color separation optical system 3, the light modulation devices 4R, 4G, and 4B, a light combining element 5, and a projection optical device 6.

[0011] The first illumination device 20 emits yellow second light L2 toward the color separation optical system 3. The second light L2 is light emitted from a light source device 21 included in the first illumination device 20. The second illumination device 80 emits blue light LB toward the light modulation device 4B. Detailed configurations of the first illumination device 20 and the second illumination device 80 will be described later.

[0012] A first optical axis J1 shown in each drawing as appropriate is the central axis of the second light L2 emitted from the first lighting device 20. A second optical axis J2 shown in Fig. 1 is the central axis of the blue light LB emitted from the second lighting device 80. The first optical axis J1 and the second optical axis J2 extend in a direction parallel to the longitudinal direction (X-axis direction).

[0013] The color separation optical system 3 separates the yellow second light L2 emitted from the first illumination device 20 into red light LR and green light LG. The color separation optical system 3 includes a dichroic mirror 7, a first reflecting mirror 8a, and a second reflecting mirror 8b.

[0014] The dichroic mirror 7 separates the second light L2 into red light LR and green light LG. The dichroic mirror 7 transmits the red light LR and reflects the green light LG. The second reflecting mirror 8b is disposed in the optical path of the green light LG. The second reflecting mirror 8b reflects the green light LG reflected by the dichroic mirror 7 toward the optical modulation device 4G. The first reflecting mirror 8a is disposed in the optical path of the red light LR. The first reflecting mirror 8a reflects the red light LR transmitted through the dichroic mirror 7 toward the optical modulation device 4R.

[0015] The blue light LB emitted from the second illumination device 80 is reflected by a reflecting mirror 9 toward the light modulation device 4B. The second illumination device 80 has a second light source unit 81, a condenser lens 82, a diffuser plate 83, a rod lens 84, and a relay lens 85. The second light source unit 81 is composed of at least one semiconductor laser. The second light source unit 81 emits blue light LB composed of laser light toward the condenser lens 82. Note that the second light source unit 81 is not limited to being a semiconductor laser, and may be composed of an LED that emits blue light.

[0016] The condenser lens 82 is made of a convex lens. The condenser lens 82 condenses the blue light LB emitted from the second light source unit 81 and makes the condensed light incident on the diffuser plate 83. The diffuser plate 83 diffuses the blue light LB emitted from the condenser lens 82 with a predetermined diffusion degree, thereby generating blue light LB having a uniform luminous intensity distribution. The diffuser plate 83 is made of, for example, frosted glass made of optical glass.

[0017] The blue light LB diffused by the diffuser plate 83 is incident on the rod lens 84. The rod lens 84 has a rectangular columnar shape extending along the second optical axis J2. The rod lens 84 has a light incident end surface 84a at one end and a light exit end surface 84b at the other end. The diffuser plate 83 is fixed to the light incident end surface 84a of the rod lens 84 via an optical adhesive (not shown). It is desirable that the refractive index of the diffuser plate 83 and the refractive index of the rod lens 84 match as closely as possible.

[0018] The blue light LB propagates through the rod lens 84 while being totally reflected, and is thereby emitted from the light-emitting end surface 84b with an increased uniformity in 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 uniformity in illuminance distribution has been increased by the rod lens 84, to be incident on the reflecting mirror 9. The shape of the light-emitting end surface 84b of the rod lens 84 is rectangular, which is approximately similar to the shape of the image formation area of ​​the light modulation device 4B. This allows the blue light LB emitted from the rod lens 84 to efficiently enter the image formation area of ​​the light modulation device 4B.

[0019] The light modulation device 4R modulates the red light LR according to image information to form image light corresponding to the red light LR. The light modulation device 4G modulates the green light LG according to image information to form image light corresponding to the green light LG. The light modulation device 4B modulates the blue light LB according to image information to form image light corresponding to the blue light LB. Each of the light modulation devices 4R, 4G, and 4B can be, for example, a transmissive liquid crystal panel. Polarizing plates (not shown) are disposed on the entrance and exit sides of each of the light modulation devices 4R, 4G, and 4B. The polarizing plates allow only linearly polarized light of a specific direction to pass through. As described above, the red light LR and the green light LG are light obtained by separating the second light L2 by the dichroic mirror 7. Therefore, the light modulation devices 4R and 4G modulate the second light L2, i.e., the light emitted from the light source device 21.

[0020] A field lens 10R is disposed on the incident side of the optical modulation device 4R. The field lens 10R collimates the chief ray of the red light LR incident on the optical modulation device 4R. A field lens 10G is disposed on the incident side of the optical modulation device 4G. The field lens 10G collimates the chief ray of the green light LG incident on the optical modulation device 4G. A field lens 10B is disposed on the incident side of the optical modulation device 4B. The field lens 10B collimates the chief ray of the blue light LB incident on the optical modulation device 4B.

[0021] The light combining element 5 combines the image light modulated by each of the light modulation devices 4R, 4G, and 4B, and emits the combined image light toward the projection optical device 6. As the light combining element 5, for example, a cross dichroic prism can be used.

[0022] The projection optical device 6 is composed of a plurality of projection lenses (not shown). The projection optical device 6 enlarges and projects the image light combined by the light combining element 5 onto the screen SCR. The projection optical device 6 projects the light modulated by the light modulation devices 4R, 4G, and 4B onto the screen SCR. This causes a color image to be displayed on the screen SCR.

[0023] Fig. 2 is a schematic configuration diagram of the first illumination device 20. Fig. 3 is a plan view of the light source device 21 as viewed from the incident direction (Y-axis direction). Fig. 4 is a cross-sectional view of the light source device 21 taken along line IV-IV in Fig. 3. Fig. 5 is a cross-sectional view of the light source device 21 taken along line VV in Fig. 3. As shown in Fig. 2, the first illumination device 20 includes the light source device 21, an integrator optical system 50, a polarization conversion element 55, and a superimposing optical system 56.

[0024] The light source device 21 converts the first light L1 into a yellow second light L2 and emits the second light L2 toward the integrator optical system 50. The light source device 21 includes a wavelength conversion member 30, a light source unit 34, an angle conversion member 38, a mirror 40, a support member 41, a control unit 90, and a measurement unit 95. As shown in FIG. 5 , the light source device 21 includes a pressing unit 60 and a temperature adjustment unit 70. The wavelength conversion member 30 of this embodiment corresponds to the "light guiding member" in the claims. Therefore, the light source device 21 includes a light guiding member.

[0025] 2, the wavelength conversion member 30 has a quadrangular prism shape extending along the longitudinal direction (X-axis direction) and has six faces. The longitudinal dimension of the wavelength conversion member 30 is larger than the dimension in the incident direction (Y-axis direction) and the dimension in the Z-axis direction. The dimension of the wavelength conversion member 30 in the incident direction and the dimension in the Z-axis direction are approximately the same. Therefore, the cross-sectional shape of the wavelength conversion member 30 cut along a plane perpendicular to the longitudinal direction is approximately square. The cross-sectional shape of the wavelength conversion member 30 cut along a plane perpendicular to the longitudinal direction may be another shape, such as rectangular.

[0026] The wavelength conversion member 30 has a first surface 30a and a second surface 30b that are perpendicular to the incident direction (Y-axis direction) and located on opposite sides of the incident direction. The second surface 30b is located on the +Y side of the first surface 30a. The first surface 30a and the second surface 30b face in opposite directions. The wavelength conversion member 30 has a third surface 30c and a fourth surface 30d that are perpendicular to the longitudinal direction (X-axis direction) and located on opposite sides of each other in the longitudinal direction. The fourth surface 30d is located on the -X side of the third surface 30c. The third surface 30c and the fourth surface 30d face in opposite directions. 4, the wavelength conversion member 30 has a fifth surface 30e and a sixth surface 30f that are perpendicular to the Z-axis direction and located on opposite sides of each other in the Z-axis direction. The sixth surface 30f is located on the -Z side of the fifth surface 30e. The fifth surface 30e and the sixth surface 30f face in opposite directions.

[0027] The wavelength conversion member 30 does not necessarily have to have a quadrangular prism shape, and may have a shape such as a triangular prism or a cylinder. When the wavelength conversion member 30 has a triangular prism shape, the three surfaces intersecting with the third surface 30c, which is the exit end surface, and the fourth surface 30d, which is the reflecting end surface, are defined as side surfaces. When the wavelength conversion member 30 has a cylindrical shape, the side surfaces are defined as one continuous curved surface intersecting with the third surface 30c and the fourth surface 30d.

[0028] 2, the wavelength conversion member 30 includes a phosphor 33 and converts first light L1 having a first wavelength band emitted from the light source unit 34 into second light L2 having a second wavelength band different from the first wavelength band. The wavelength conversion member 30 emits the second light L2 toward the angle conversion member 38. The first light L1 is emitted from the light source unit 34 in the incident direction (Y-axis direction) and enters the wavelength conversion member 30 from the first surface 30a. The second light L2 is guided inside the wavelength conversion member 30 and then emitted from the third surface 30c toward the angle conversion member 38.

[0029] In this embodiment, the phosphor 33 is a ceramic phosphor made of a polycrystalline phosphor that converts the first light L1 into the second light L2. The second wavelength band of the second light L2 is, for example, a yellow wavelength band of 490 nm to 900 nm. That is, the second light L2 is yellow fluorescence containing a red light component and a green light component. The phosphor 33 may be a single crystal phosphor. The wavelength conversion member 30 may be made of fluorescent glass. The wavelength conversion member 30 may be made of a material in which a large number of phosphor particles are dispersed in a binder made of glass or resin.

[0030] In this embodiment, the wavelength conversion member 30 contains, for example, an yttrium-aluminum-garnet (YAG) phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, the wavelength conversion member 30 can be made from a material obtained by mixing raw material powders containing constituent elements such as Y2O3, Al2O3, and CeO3 and subjecting them to a solid-phase reaction; Y-Al-O amorphous particles obtained by a wet method such as a coprecipitation method or a sol-gel method; or YAG particles obtained by a gas-phase method such as a spray-drying method, a flame pyrolysis method, or a thermal plasma method.

[0031] When the first light L1 is incident on the wavelength conversion member 30, the phosphor 33 absorbs the first light L1 and emits second light L2 having a second wavelength band. As a result, the wavelength conversion member 30 converts the first light L1 into the second light L2. When the phosphor 33 absorbs the first light L1, the phosphor 33 generates heat. As a result, the temperature of the wavelength conversion member 30 rises.

[0032] The light source unit 34 irradiates the wavelength conversion member 30 with the first light L1. The light source unit 34 is disposed opposite to the first surface 30a of the wavelength conversion member 30 in the incident direction (Y-axis direction). As shown in FIG. 4, the light source unit 34 has a substrate 35 and a light-emitting element 36. The light source unit 34 may have other optical members such as a light guide plate, a diffusion plate, and a lens.

[0033] The substrate 35 is plate-shaped and extends in a direction perpendicular to the incident direction (Y-axis direction). When viewed from the incident direction, the substrate 35 is substantially rectangular with its long sides extending in the longitudinal direction (X-axis direction). The substrate 35 has a surface 35a. The surface 35a is the outer surface of the substrate 35 that faces the +Y side. The surface 35a faces the wavelength conversion member 30 in the incident direction.

[0034] The light-emitting element 36 is mounted on the surface 35a of the substrate 35. The light-emitting element 36 is, for example, a light-emitting diode (LED). The light-emitting element 36 has a light-emitting surface 36a. The light-emitting surface 36a faces the first surface 30a of the wavelength conversion member 30 in the incident direction (Y-axis direction). The light-emitting element 36 emits first light L1 having a first wavelength band, i.e., light, from the light-emitting surface 36a toward the first surface 30a of the wavelength conversion member 30. As a result, the first light L1 emitted from the light-emitting element 36 is incident on the wavelength conversion member 30. As shown in FIG. 2, the wavelength conversion member 30 converts the first light L1 into second light L2 and emits the second light L2. In this embodiment, the first wavelength band is, for example, a wavelength band from 400 nm to 480 nm, ranging from blue to violet. The peak wavelength of the first light L1 is, for example, 445 nm.

[0035] The light source unit 34 has a plurality of light-emitting elements 36. In this embodiment, the light source unit 34 has four light-emitting elements 36. The light-emitting elements 36 are arranged at intervals along the longitudinal direction (X-axis direction). Each light-emitting element 36 faces the first surface 30a in the incident direction (Y-axis direction). The number of light-emitting elements 36 included in the light source unit 34 is not particularly limited, and may be three or less, or five or more.

[0036] The support member 41 extends in the longitudinal direction (X-axis direction) and supports the wavelength conversion member 30, i.e., the light guide member. Heat generated in the wavelength conversion member 30 is transferred to the support member 41, and the heat is dissipated to the outside of the light source device 21. For this reason, the support member 41 is preferably made of a material having a predetermined strength and high thermal conductivity. Materials that can be used for the support member 41 include aluminum and stainless steel, and aluminum alloys such as 6061 are particularly preferred. In this embodiment, the support member 41 is made of aluminum. As shown in FIG. 4, the support member 41 has a U-shape when viewed in the longitudinal direction. As shown in FIG. 3, the support member 41 has a support groove 41a, a side wall portion 41c, a first housing portion 48a, a second housing portion 48b, a third housing portion 48c, a fourth housing portion 48d, a fifth housing portion 48e, a sixth housing portion 48f, a first recess 49a, and a second recess 49f.

[0037] As shown in Fig. 4, the support groove 41a is a groove recessed from the surface of the support member 41 facing the -Y side toward the +Y side. As shown in Fig. 3, the support groove 41a extends in the longitudinal direction (X-axis direction). The support groove 41a accommodates the wavelength conversion member 30. As shown in Fig. 4, the support groove 41a has a support surface 43 and a side wall surface 44.

[0038] The support surface 43 is a surface of the inner surface of the support groove 41a facing the -Y side. The support surface 43 supports the second surface 30b of the wavelength conversion member 30 in the incident direction (Y-axis direction). In this way, the support surface 43 supports the wavelength conversion member 30. Heat generated in the wavelength conversion member 30 is transferred to the support member 41 via the support surface 43, and is radiated from the outer surface of the support member 41 to the outside of the light source device 21. This makes it possible to prevent the temperature of the wavelength conversion member 30 from becoming too high.

[0039] The side wall portion 41c is a portion of the support member 41 that faces the wavelength conversion member 30 in the Z-axis direction. In this embodiment, the support member 41 has two side wall portions 41c. The two side wall portions 41c include a first side wall portion 41e and a second side wall portion 41f.

[0040] The first side wall 41e is a portion of the support member 41 located on the +Z side of the support groove 41a. The first side wall 41e faces the fifth surface 30e of the wavelength conversion member 30 with a gap in the Z direction. The second side wall 41f is a portion of the support member 41 located on the -Z side of the support groove 41a. The second side wall 41f faces the sixth surface 30f of the wavelength conversion member 30 with a gap in the Z direction. The second side wall 41f faces the first side wall 41e in the Z axis direction with the wavelength conversion member 30 in between.

[0041] The side wall surface 44 is a surface of the inner surface of the support groove 41a that faces the wavelength conversion member 30 in the Z-axis direction. In the present embodiment, the support groove 41a has two side wall surfaces 44. The two side wall surfaces 44 include a first side wall surface 45 and a second side wall surface 46.

[0042] The first side wall surface 45 is a surface of the outer surface of the first side wall portion 41e facing the -Z side. The first side wall surface 45 faces the fifth surface 30e of the wavelength conversion member 30. The first side wall surface 45 has a first portion 45a located on the side farther from the support surface 43 and a second portion 45b located on the side closer to the support surface 43. The first portion 45a extends in a direction perpendicular to the support surface 43. The second portion 45b is an inclined surface that approaches the wavelength conversion member 30 as it approaches the support surface 43.

[0043] The second side wall surface 46 is the surface of the outer surface of the second side wall portion 41f facing the +Z side. The second side wall surface 46 faces the sixth surface 30f of the wavelength conversion member 30. The second side wall surface 46 has a third portion 46a located on the side farther from the support surface 43 and a fourth portion 46b located on the side closer to the support surface 43. The third portion 46a extends in a direction perpendicular to the support surface 43. The fourth portion 46b is an inclined surface that approaches the wavelength conversion member 30 as it approaches the support surface 43.

[0044] 3 is a recess that communicates with the end of the support groove 41a on the +X side. The first accommodating portion 48a penetrates the support member 41 to the outer edge 41h on the +X side. The first accommodating portion 48a accommodates the first protrusion 32a of the wavelength conversion member 30 that protrudes from the support groove 41a on the +X side. The first accommodating portion 48a also holds the angle conversion member 38 fixed to the third surface 30c of the wavelength conversion member 30.

[0045] The second housing portion 48b is a recess that communicates with the end of the support groove 41a on the -X side. The second housing portion 48b penetrates the support member 41 to the outer edge 41h on the -X side. The second housing portion 48b houses the second protrusion 32c of the wavelength conversion member 30 that protrudes from the support groove 41a to the -X side. The second housing portion 48b also houses the mirror 40 provided on the fourth surface 30d of the wavelength conversion member 30.

[0046] The third accommodating portion 48c is a recess extending from the first accommodating portion 48a to the +Z side. The third accommodating portion 48c accommodates the position restricting portion 66a that holds the +Z side portion of the first protruding portion 32a.

[0047] The fourth accommodating portion 48d is a recess extending from the first accommodating portion 48a to the -Z side. The fourth accommodating portion 48d accommodates the position restricting portion 66b that holds the -Z side portion of the first protruding portion 32a.

[0048] The fifth accommodating portion 48e is a recess extending in the +Z direction from the second accommodating portion 48b. The fifth accommodating portion 48e accommodates the position restricting portion 66c that holds the +Z side portion of the second protruding portion 32c.

[0049] The sixth accommodating portion 48f is a recess extending in the −Z direction from the second accommodating portion 48b. The sixth accommodating portion 48f accommodates the position restricting portion 66d that holds the −Z side portion of the second protruding portion 32c.

[0050] The position restricting portions 66a, 66b, 66c, and 66d hold the first protruding portion 32a or the second protruding portion 32c protruding in the longitudinal direction (X-axis direction) from the support groove 41a of the support member 41, and restrict the position of the wavelength conversion member 30 with respect to the support groove 41a. Each of the position restricting portions 66a, 66b, 66c, and 66d is fixed to the support member 41 with a screw 68. The position restricting portions 66a and 66b can adjust their respective positions in the Z-axis direction by an adjustment mechanism (not shown). Similarly, the position restricting portions 66c and 66d can adjust their respective positions in the Z-axis direction by an adjustment mechanism (not shown).

[0051] As shown in FIG. 5, the first recess 49a is a hole recessed toward the +Y side from the surface of the first side wall portion 41e facing the -Y side. The first recess 49a is open to the -Z side. The interior of the first recess 49a is connected to the interior of the support groove 41a. The dimension of the first recess 49a in the incident direction (Y-axis direction) is smaller than the dimension of the support groove 41a in the incident direction. As shown in FIG. 3, when viewed from the incident direction, the first recess 49a has a substantially rectangular shape with its long side extending in the Z-axis direction. The support member 41 has multiple first recesses 49a. In this embodiment, the support member 41 has two first recesses 49a. The first recesses 49a are spaced apart in the longitudinal direction (X-axis direction). Although not shown, each first recess 49a is located between a pair of light-emitting elements 36 arranged adjacent to each other in the longitudinal direction. As shown in FIG. 5, the first recess 49a has a first inner surface 49b.

[0052] First inner surface 49b is the surface of the inner surface of first recess 49a facing the -Y side. In the incident direction (Y-axis direction), first inner surface 49b is located on the -Y side of support surface 43. First hole 49c is provided in first inner surface 49b. First hole 49c is a female threaded hole recessed from first inner surface 49b toward the +Y side.

[0053] The second recess 49f is a hole recessed toward the +Y side from the surface of the second side wall portion 41f facing the -Y side. The second recess 49f is open toward the +Z side. The interior of the second recess 49f is connected to the interior of the support groove 41a. The dimension of the second recess 49f in the incident direction (Y-axis direction) is smaller than the dimension of the support groove 41a in the incident direction. As shown in FIG. 3, when viewed from the incident direction, the second recess 49f has a substantially rectangular shape with its long side extending in the Z-axis direction. The support member 41 has multiple second recesses 49f. In this embodiment, the support member 41 has two second recesses 49f. The second recesses 49f are spaced apart in the longitudinal direction (X-axis direction). Each second recess 49f faces a different first recess 49a in the Z-axis direction. Although not shown, each second recess 49f is provided between a pair of light-emitting elements arranged adjacent to each other in the longitudinal direction. As shown in FIG. 5, the second recess 49f has a second inner surface 49g.

[0054] Second inner surface 49g is the surface of the inner surface of second recess 49f facing the -Y side. In the incident direction (Y-axis direction), second inner surface 49g is located on the -Y side of support surface 43. Second inner surface 49g is provided with second hole portion 49h. Second hole portion 49h is a female threaded hole recessed from second inner surface 49g toward the +Y side.

[0055] 2, the mirror 40 is provided on the fourth surface 30d of the wavelength converting member 30. The mirror 40 guides the second light L2 inside the wavelength converting member 30 and reflects the second light L2 that reaches the fourth surface 30d toward the third surface 30c. The mirror 40 is made of a metal film or a dielectric multilayer film formed on the fourth surface 30d of the wavelength converting member 30.

[0056] The first light L1 emitted from the light-emitting element 36 toward the first surface 30a enters the wavelength conversion member 30 from the first surface 30a. When the first light L1 enters the wavelength conversion member 30, the phosphor 33 is excited by the first light L1 and emits second light L2. The second light L2 travels radially from the phosphor 33. The second light L2 traveling toward the first surface 30a, the second surface 30b, the fifth surface 30e, and the sixth surface 30f of the wavelength conversion member 30 is repeatedly totally reflected by each of the surfaces 30a, 30b, 30e, and 30f, and travels toward the third surface 30c or the fourth surface 30d. The second light L2 traveling toward the fourth surface 30d is reflected by the mirror 40 and travels toward the third surface 30c. As a result, all of the second light L2 emitted from the phosphor 33 travels toward the third surface 30c, passes through the third surface 30c, and enters the angle conversion member 38. As described above, when the phosphor 33 absorbs the first light L1, the phosphor 33 generates heat. This causes the temperature of the wavelength conversion member 30 to rise.

[0057] FIG. 6 is a diagram showing the wavelength spectrum of the second light L2 of this embodiment. Next, the relationship between the temperature Tg of the wavelength conversion member 30 and the wavelength spectrum of the second light L2 emitted from the wavelength conversion member 30 will be described. The horizontal axis of Fig. 6 represents the measured wavelength, and the vertical axis represents the light intensity ratio, where the maximum light intensity in the emission spectrum emitted from the wavelength conversion member 30 is the denominator and the light intensity of each wavelength is the numerator. The wavelength spectrum of the second light L2 when the temperature Tg of the wavelength conversion member 30 is lower than a second temperature T2 (described later) is shown by a solid line, and the wavelength spectrum of the second light L2 when the temperature Tg of the wavelength conversion member 30 is higher than the second temperature T2 is shown by a dashed line.

[0058] As described above, the second wavelength band of the second light L2 is, for example, a yellow wavelength band of 490 nm to 900 nm. The second light L2 has a maximum intensity at a wavelength of around 600 nm. When the temperature Tg of the wavelength conversion member 30 becomes higher than the second temperature T2, the light intensity in the wavelength range of 490 nm to 600 nm decreases, and the wavelength spectrum shifts to the long wavelength side. This reduces the light intensity of the green wavelength band of the second light L2, thereby reducing the color gamut of the second light L2. Therefore, when the temperature Tg of the wavelength conversion member 30 becomes too high, the color gamut of the color image projected by the projector 1 onto the screen SCR decreases. This reduces the quality of the image projected by the projector 1 onto the screen SCR.

[0059] The angle conversion member 38 shown in FIG. 2 is provided on the exit side of the third surface 30c of the wavelength conversion member 30. The second light L2 exiting from the third surface 30c is incident on the angle conversion member 38. The angle conversion member 38 is made of a light-transmitting member such as a tapered rod. The angle conversion member 38 has an entrance surface 38a on which the second light L2 exiting from the wavelength conversion member 30 is incident, an exit surface 38b from which the second light L2 exits, and a reflective side surface 38c that reflects the second light L2 toward the exit surface 38b. The entrance surface 38a faces the third surface 30c in the longitudinal direction (X-axis direction).

[0060] The angle conversion member 38 has a truncated quadrangular pyramid shape, and the cross-sectional area of ​​the cross section perpendicular to the first optical axis J1 expands along the traveling direction of the second light L2. Therefore, the area of ​​the exit surface 38b is larger than the area of ​​the entrance surface 38a. In this embodiment, the optical axis of the angle conversion member 38 coincides with the first optical axis J1.

[0061] The second light L2 incident on the angle conversion member 38 changes its traveling direction each time it is totally reflected by the reflective side surface 38c so as to approach a direction parallel to the first optical axis J1. In this way, the angle conversion member 38 converts the emission angle distribution of the second light L2 emitted from the wavelength conversion member 30. More specifically, the angle conversion member 38 makes the maximum emission angle of the second light L2 on the emission surface 38b smaller than the maximum incident angle of the second light L2 on the incidence surface 38a.

[0062] Generally, the etendue of light, which is defined as the product of the area of ​​the light exit region and the maximum exit angle, which is the solid angle of the light, is preserved, and therefore the etendue of the second light L2 is preserved both before and after passing through the angle conversion member 38. As described above, the angle conversion member 38 has a configuration in which the area of ​​the exit surface 38b is larger than the area of ​​the incident surface 38a. Therefore, from the viewpoint of etendue preservation, the angle conversion member 38 can make the maximum exit angle of the second light L2 on the exit surface 38b smaller than the maximum incident angle of the second light L2 on the incident surface 38a.

[0063] The angle conversion member 38 is fixed to the wavelength conversion member 30 via an optical adhesive (not shown) so that the incident surface 38a faces the third surface 30c of the wavelength conversion member 30. That is, the angle conversion member 38 and the wavelength conversion member 30 are in contact with each other via the optical adhesive, and no gap, such as an air layer, is provided between the angle conversion member 38 and the wavelength conversion member 30. If a gap were provided between the angle conversion member 38 and the wavelength conversion member 30, the second light L2 that reaches the incident surface 38a of the angle conversion member 38 and is incident on the incident surface 38a at an angle equal to or greater than the critical angle would be totally reflected by the incident surface 38a and would not be able to enter the angle conversion member 38. In contrast, if no gap is provided between the angle conversion member 38 and the wavelength conversion member 30, as in this embodiment, the loss component of the second light L2 that cannot enter the angle conversion member 38 due to total reflection can be reduced. From this perspective, it is desirable to match the refractive index of the angle conversion member 38 and the refractive index of the wavelength conversion member 30 as closely as possible.

[0064] The configuration of the angle conversion member 38 is not limited to that of this embodiment, and may be, for example, a compound parabolic concentrator (CPC). Even when a CPC is used as the angle conversion member 38, the same effect as when a tapered rod is used can be obtained. Furthermore, the light source device 21 does not necessarily have to include the angle conversion member 38.

[0065] The integrator optical system 50 has a first lens array 52 and a second lens array 53. The integrator optical system 50, together with the superimposing optical system 56, functions as a uniform illumination optical system that uniformizes the intensity distribution of the second light L2 emitted from the light source device 21 in each of the light modulation devices 4R and 4G, which are the illuminated areas. The second light L2 emitted from the emission surface 38b of the angle conversion member 38 is incident on the first lens array 52.

[0066] The first lens array 52 has a plurality of first small lenses 52a. The first small lenses 52a are arranged in a matrix on a plane perpendicular to the first optical axis J1. Each first small lens 52a splits the second light L2 emitted from the angle conversion member 38 into a plurality of partial light beams. The shape of each first small lens 52a is rectangular, which is approximately similar to the shape of the image formation areas of the light modulation devices 4R and 4G. This allows each of the partial light beams emitted from the first lens array 52 to efficiently enter the image formation areas of the light modulation devices 4R and 4G.

[0067] The second lens array 53 is disposed on the exit side of the first lens array 52. ​​The second light L2 emitted from the first lens array 52 is incident on the second lens array 53. The second lens array 53 has a plurality of second small lenses 53a corresponding to the plurality of first small lenses 52a of the first lens array 52. ​​The second small lenses 53a are arranged in a matrix on a plane perpendicular to the first optical axis J1. The second lens array 53, together with the superimposing optical system 56, forms an image of the second light L2 emitted from each of the first small lenses 52a of the first lens array 52 near the image forming areas of the light modulation devices 4R and 4G.

[0068] In this embodiment, the first small lenses 52a of the first lens array 52 and the second small lenses 53a of the second lens array 53 have the same size, but may have different sizes. Also, in this embodiment, the first small lenses 52a of the first lens array 52 and the second small lenses 53a of the second lens array 53 are arranged so that their optical axes coincide with each other, but they may be arranged eccentrically with each other.

[0069] The polarization conversion element 55 includes a polarization separation layer (not shown) that transmits one linearly polarized component of the polarization components contained in the second light L2 emitted from the light source device 21 as is and reflects the other linearly polarized component in a direction perpendicular to the first optical axis J1, a reflection layer (not shown) that reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the first optical axis J1, and a retardation plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into one linearly polarized component. The polarization conversion element 55 converts the polarization direction of the second light L2 emitted from the second lens array 53. More specifically, the polarization conversion element 55 converts each partial beam of the second light L2 split by the first lens array 52 and emitted from the second lens array 53 into linearly polarized light.

[0070] The second light L2 transmitted through the polarization conversion element 55 enters the superimposing optical system 56. The superimposing optical system 56 cooperates with the integrator optical system 50 to form a uniform illumination optical system that uniformizes the intensity distribution of the second light L2 in each of the light modulation devices 4R and 4G, which are the illuminated areas. The superimposing optical system 56 causes the second light L2 to enter the color separation optical system 3.

[0071] 5 presses the wavelength conversion member 30, i.e., the light guide member, against the support member 41. More specifically, the pressing unit 60 applies a pressing force Fp toward the +Y side to the wavelength conversion member 30, thereby pressing the second surface 30b of the wavelength conversion member 30 against the support surface 43 of the support member 41. In this embodiment, the pressing unit 60 has a pressing member 61, an elastic member 62, and screws 63 and 64.

[0072] The pressing member 61 presses the wavelength conversion member 30 against the support member 41. The pressing member 61 is a leaf spring extending in the Z-axis direction. The pressing member 61 has elasticity. One end 61a of the pressing member 61 faces the first inner surface 49b in the incident direction (Y-axis direction). An elastic member 62 that is elastically deformable in the incident direction is disposed between the one end 61a and the first inner surface 49b. In this embodiment, the elastic member 62 is a coil spring. The elastic member 62 contacts the one end 61a and the first inner surface 49b. When a screw 63 is inserted into the hole of the one end 61a and tightened into the first hole 49c, an elastic force directed toward the -Y side is applied to the one end 61a by the elastic member 62. As a result, the one end 61a is pressed against the head of the screw 63 from the +Y side, and the position of the one end 61a in the incident direction is determined.

[0073] The other end 61c of the pressing member 61 faces the second inner surface 49g in the incident direction. An elastic member 62 is disposed between the other end 61c and the second inner surface 49g. The elastic member 62 contacts the other end 61c and the second inner surface 49g. When a screw 64 is inserted into the hole of the other end 61c and tightened into the second hole 49h, an elastic force directed toward the -Y side is applied to the other end 61c by the elastic member 62. As a result, the other end 61c is pressed against the head of the screw 64 from the +Y side, and the position of the other end 61c in the incident direction is determined.

[0074] The center portion of the pressing member 61 presses the first surface 30a of the wavelength conversion member 30 from the -Y side. This causes the pressing unit 60 to press the wavelength conversion member 30 against the support member 41. The pressing force Fp with which the pressing unit 60 presses the wavelength conversion member 30 against the support member 41 is adjusted by the positions of one end 61a and the other end 61c of the pressing member 61 in the incident direction (Y-axis direction). The pressing force Fp increases as each of the one end 61a and the other end 61c of the pressing member 61 is positioned on the +Y side. The pressing force Fp decreases as each of the one end 61a and the other end 61c of the pressing member 61 is positioned on the -Y side. In this embodiment, the positions of each of the one end 61a and the other end 61c of the pressing member in the incident direction can be adjusted by the temperature adjustment unit 70.

[0075] In this embodiment, the temperature adjustment unit 70 adjusts the tightening amount of the screw 63 into the first hole 49c and the tightening amount of the screw 64 into the second hole 49h. In this embodiment, the temperature adjustment unit 70 has two motors 71. A shaft 72 is connected to one of the motors 71. When one of the motors 71 is driven, the shaft 72 rotates around an axis parallel to the incident direction. The tip of the shaft 72 is engaged with the head of the screw 63. This allows the one motor 71 to adjust the tightening amount of the screw 63 into the first hole 49c. A shaft 72 is also connected to the other motor 71. When the other motor 71 is driven, the shaft 72 rotates around an axis parallel to the incident direction. The tip of the shaft 72 is engaged with the head of the screw 64. This allows the other motor 71 to adjust the tightening amount of the screw 64 into the second hole 49h.

[0076] As the tightening amount of the screw 63 into the first hole 49c and the tightening amount of the screw 64 into the second hole 49h increase, the one end 61a and the other end 61c of the pressing member 61 are positioned on the +Y side, and therefore the pressing force Fp increases. As the pressing force Fp increases, the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41 increases, and therefore the amount of heat transferred from the wavelength conversion member 30 to the support member 41 increases. This allows the temperature of the wavelength conversion member 30 to be lowered. Furthermore, as the tightening amount of the screw 63 into the first hole 49c and the tightening amount of the screw 64 into the second hole 49h decrease, the one end 61a and the other end 61c of the pressing member 61 are positioned on the -Y side, and therefore the pressing force Fp decreases. As the pressing force Fp decreases, the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41 decreases, and therefore the amount of heat transferred from the wavelength conversion member 30 to the support member 41 decreases. This makes it possible to increase the temperature of the wavelength conversion member 30. Therefore, the temperature adjustment unit 70 adjusts the pressing force Fp with which the pressing unit 60 presses the wavelength conversion member 30, i.e., the light guiding member, against the support member 41, thereby adjusting the temperature of the wavelength conversion member 30.

[0077] The measurement unit 95 shown in FIG. 2 measures a characteristic value Vc that correlates with the temperature Tg of the wavelength conversion member 30, i.e., the light-guiding member. In the following description, the characteristic value Vc that correlates with the temperature of the wavelength conversion member 30, i.e., the light-guiding member, may be simply referred to as the "characteristic value Vc." The measurement unit 95 is attached to the wavelength conversion member 30. In this embodiment, the measurement unit 95 is a temperature sensor. The measurement unit 95 measures the temperature Tg of the wavelength conversion member 30. That is, in this embodiment, the characteristic value Vc is the temperature Tg of the wavelength conversion member 30. In this embodiment, the measurement unit 95 is attached to the end of the first surface 30a of the wavelength conversion member 30 on the -X side. The position at which the measurement unit 95 is attached to the wavelength conversion member 30 is not limited to this embodiment. Furthermore, the measurement unit 95 does not have to be attached to the wavelength conversion member 30. In this case, the measurement unit 95 is preferably a temperature sensor, such as a radiation temperature sensor, that can measure the temperature Tg of the wavelength conversion member 30 without contacting the wavelength conversion member 30. Furthermore, the light source device 21 may have a plurality of measuring units 95. In this case, the temperature Tg of the wavelength conversion member 30 may be the maximum temperature of the temperatures measured by each measuring unit 95, or may be the average temperature of the temperatures measured by each measuring unit 95. Furthermore, it is preferable that each measuring unit 95 is arranged along the longitudinal direction (X-axis direction).

[0078] In this embodiment, the control unit 90 is connected to each of the measurement unit 95 and the temperature adjustment unit 70. The control unit 90 controls the operation of the temperature adjustment unit 70. In this embodiment, the control unit 90 is a computer that controls the operation of the temperature adjustment unit 70. A control program that controls the operation of the temperature adjustment unit 70 is installed in the control unit 90. At least a part of the functions of each component of the control unit 90 is realized by, for example, a processor such as a CPU (Central Processing Unit) executing a control program, i.e., software, stored in a memory unit (not shown). The control unit 90 has a memory unit 91.

[0079] The storage unit 91 stores a conversion table Tb1 that defines the relationship between the temperature Tg of the wavelength conversion member 30 measured by the measurement unit 95 and the pressing force Fp. As the storage unit 91, a recording medium such as a ROM (Read Only Memory) or a flash memory can be used.

[0080] 7 is a flowchart showing the temperature control of this embodiment. In the temperature control of this embodiment, the temperature Tg of the wavelength conversion member 30 is maintained between a first temperature T1 and a second temperature T2. In this embodiment, the second temperature T2 is higher than the first temperature T1. First, the control unit 90 sets a first temperature T1 and a second temperature T2 (S10). Each of the first temperature T1 and the second temperature T2 may be a predetermined temperature, or may be a temperature determined appropriately based on the environmental conditions in which the light source device 21 is disposed, such as the temperature of the environment in which the projector 1 is installed and the temperature inside the projector 1. Next, the control unit 90 acquires the temperature Tg of the wavelength conversion member 30 measured by the measurement unit 95, i.e., the characteristic value Vc (S11). If the temperature Tg of the wavelength conversion member 30 is lower than the first temperature T1 (S12), the control unit 90 sets the pressing force Fp to a new pressing force Fp(Tg) based on the conversion table Tb1 and the temperature Tg of the wavelength conversion member 30 (S13). This allows the currently set pressing force Fp to be reduced. Next, the control unit 90 controls the temperature adjustment unit 70 to adjust the pressing force Fp to the newly set pressing force Fp. This reduces the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41, thereby reducing the amount of heat transferred from the wavelength conversion member 30 to the support member 41. Therefore, it is possible to prevent the temperature of the wavelength conversion member 30 from becoming too low.

[0081] When the temperature Tg of the wavelength conversion member 30 is equal to or higher than the first temperature T1 and is higher than the second temperature T2 (S12, S14), the control unit 90 sets the pressing force Fp to a new pressing force Fp(Tg) based on the conversion table Tb1 and the temperature Tg of the wavelength conversion member 30 (S15). This increases the pressing force Fp. Next, the control unit 90 adjusts the pressing force Fp to the newly set pressing force Fp using the temperature adjustment unit 70. That is, when the temperature Tg of the wavelength conversion member 30 becomes higher than the predetermined temperature T2, the control unit 90 increases the pressing force Fp using the temperature adjustment unit 70. This increases the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41, thereby increasing the amount of heat transferred from the wavelength conversion member 30 to the support member 41. This prevents the temperature of the wavelength conversion member 30 from becoming too high.

[0082] When the temperature Tg of the wavelength conversion member 30 is equal to or higher than the first temperature T1 and equal to or lower than the second temperature T2 (S12, S14), the control unit 90 does not set a new pressing force Fp and does not adjust the pressing force Fp by the temperature adjustment unit 70. For the reasons described above, in the temperature control of this embodiment, the control unit 90 controls the temperature adjustment unit 70 based on the temperature of the wavelength conversion member 30, i.e., the characteristic value Vc that correlates with the temperature of the wavelength conversion member 30. As a result, the temperature control of this embodiment can prevent the temperature Tg of the wavelength conversion member 30 from becoming too low or too high.

[0083] According to this embodiment, the light source device 21 includes a light source unit 34 having a light-emitting element 36 that emits a first light L1, i.e., light; a wavelength conversion member 30 (i.e., a light-guiding member) that receives the first light L1 emitted from the light-emitting element 36 and emits a second light L2, i.e., light; a support member 41 that supports the wavelength conversion member 30; a pressing unit 60 that presses the wavelength conversion member 30 against the support member 41; a measurement unit 95 that measures a characteristic value Vc that correlates with the temperature Tg of the wavelength conversion member 30; a control unit 90 that acquires the characteristic value Vc measured by the measurement unit 95; and a temperature adjustment unit 70 that adjusts the temperature Tg of the wavelength conversion member 30. The control unit 90 controls the temperature adjustment unit 70 based on the characteristic value Vc. Therefore, while the light source device 21 is operating, the temperature Tg of the wavelength conversion member 30 can be prevented from becoming too high, as described above. This prevents an increase in thermal quenching of the second light L2 in the wavelength conversion member 30, thereby preventing a decrease in the wavelength conversion efficiency of the wavelength conversion member 30. Moreover, since it is possible to prevent the temperature Tg of the wavelength conversion member 30 from becoming too high, it is possible to prevent a decrease in the color gamut of the second light L2 emitted by the wavelength conversion member 30. Therefore, it is possible to prevent a decrease in the quality of the image projected by the projector 1. Furthermore, since it is possible to prevent thermal deterioration of the wavelength conversion member 30, it is possible to improve the durability performance of the wavelength conversion member 30.

[0084] According to the present embodiment, the characteristic value Vc is the temperature Tg of the wavelength conversion member 30, and the temperature adjustment unit 70 adjusts the pressing force Fp with which the pressing unit 60 presses the wavelength conversion member 30 against the support member 41. Therefore, when the light source device 21 is operating, the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41 can be adjusted. This makes it possible to adjust the amount of heat transferred from the wavelength conversion member 30 to the support member 41. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 21 via the support member 41 can be adjusted based on the temperature Tg of the wavelength conversion member 30, thereby preventing the temperature of the wavelength conversion member 30 from becoming too high. Therefore, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member 30 and a decrease in the quality of the image projected by the projector 1.

[0085] Furthermore, in this embodiment, as described above, when the temperature Tg of the wavelength conversion member 30 is lower than the first temperature T1, the control unit 90 controls the temperature adjustment unit 70 to reduce the pressing force Fp. This reduces the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41, as described above. This prevents the area of ​​the air layer between the wavelength conversion member 30 and the support surface 43 from becoming too small. This reduces the amount of second light L2 that propagates through the wavelength conversion member 30 and enters the second surface 30b, and that is emitted from the second surface 30b to the outside of the wavelength conversion member 30 and absorbed by the support surface 43. This therefore reduces the wavelength conversion efficiency of the wavelength conversion member 30.

[0086] According to this embodiment, when the temperature of the wavelength conversion member 30 becomes higher than the predetermined temperature T2, the control unit 90 increases the pressing force Fp using the temperature adjustment unit 70. Therefore, as described above, when the temperature of the wavelength conversion member 30 becomes higher than the predetermined temperature T2, the contact area between the second surface 30b and the support surface 43 can be increased. This increases the amount of heat transferred from the wavelength conversion member 30 to the support member 41. This increases the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 21, thereby preventing the temperature of the wavelength conversion member 30 from becoming too high.

[0087] According to this embodiment, the light emitting element 36 emits first light L1 having a first wavelength band, and the light guide member is the wavelength conversion member 30 that contains a phosphor 33, converts the first light L1 into second light L2 having a second wavelength band different from the first wavelength band, and emits the second light L2. As described above, this embodiment can prevent the temperature Tg of the wavelength conversion member 30 from becoming too high. Therefore, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member 30, and also to prevent a decrease in the quality of the image projected by the projector 1.

[0088] According to this embodiment, the projector 1 includes a light source device 21, light modulation devices 4R, 4G, and 4B that modulate the light emitted from the light source device 21, and a projection optical device 6 that projects the light modulated by the light modulation devices 4R, 4G, and 4B. As described above, in this embodiment, the wavelength conversion efficiency of the wavelength conversion member 30 can be increased, and therefore the amount of second light L2 emitted from the wavelength conversion member 30 can be increased. This makes it possible to reduce the amount of first light L1 required to emit a predetermined amount of second light L2. Therefore, since the amount of first light L1 emitted by the light-emitting element 36 can be reduced, the power consumed by the projector 1 can be reduced.

[0089] (First Modification) A projector 101 according to a first modified example of the first embodiment will be described below. The basic configuration of projector 101 of this modified example is similar to that of projector 1 of the first embodiment, and projector 101 of this modified example includes a pressing unit 160 and a temperature adjustment unit 170. In the following description, components that are the same as those in projector 1 of the first embodiment described above are given the same reference numerals, and descriptions thereof will be omitted.

[0090] 8 is a cross-sectional view of a light source device 121 of this modified example. The light source device 121 includes a pressing unit 160 and a temperature adjustment unit 170. The pressing unit 160 presses the wavelength conversion member 30 against the support member 41. In this modified example, the pressing unit 160 includes a pressing member 161 and an elastic member 162.

[0091] The pressing member 161 presses the wavelength conversion member 30 against the support member 41. The pressing member 161 is a plate spring extending in the Z-axis direction. The pressing member 161 has elasticity. One end 161a of the pressing member 161 faces the first inner surface 49b in the incident direction (Y-axis direction). An elastic member 162 that is elastically deformable in the incident direction is disposed between the one end 161a and the first inner surface 49b. The elastic member 162 contacts the one end 161a and the first inner surface 49b. An elastic force toward the -Y side is applied to the one end 161a by the elastic member 162.

[0092] The other end 161c of the pressing member 161 faces the second inner surface 49g in the incident direction. An elastic member 162 is disposed between the other end 161c and the second inner surface 49g. The elastic member 162 contacts the other end 161c and the second inner surface 49g. An elastic force directed toward the -Y side is applied to the other end 161c by the elastic member 162.

[0093] The center of the pressing member 161 presses the first surface 30a of the wavelength conversion member 30 from the -Y side. The pressing force Fp increases as each of the one end 161a and the other end 161c of the pressing member 161 is positioned closer to the +Y side. The pressing force Fp decreases as each of the one end 161a and the other end 161c of the pressing member 161 is positioned closer to the -Y side. In this modification, the positions of each of the one end 161a and the other end 161c of the pressing member in the incident direction can be adjusted by the temperature adjustment unit 170.

[0094] In this modified example, the temperature adjustment unit 170 adjusts the pressure applied to each of the one end 161a and the other end 161c toward the +Y side. In this modified example, the temperature adjustment unit 170 has two air cylinders 171. One of the air cylinders 171 adjusts the pressure applied to the one end 161a toward the +Y side. This makes it possible to adjust the position of the one end 161a in the incident direction (+Y axis direction). The other air cylinder 171 adjusts the pressure applied to the other end 161c toward the +Y side. This makes it possible to adjust the position of the other end 161c in the incident direction.

[0095] As the pressure applied to one end 161a and the other end 161c increases, one end 161a and the other end 161c are positioned closer to the +Y side, and therefore the pressing force Fp increases. As the pressing force Fp increases, the amount of heat transferred from the wavelength conversion member 30 to the support member 41 increases, and therefore the temperature of the wavelength conversion member 30 can be reduced. Furthermore, as the pressure applied to one end 161a and the other end 161c decreases, one end 161a and the other end 161c are positioned closer to the -Y side, and therefore the pressing force Fp decreases. As the pressing force Fp decreases, the amount of heat transferred from the wavelength conversion member 30 to the support member 41 decreases, and therefore the temperature of the wavelength conversion member 30 can be increased. Therefore, the temperature adjustment unit 170 adjusts the pressing force Fp with which the pressing unit 160 presses the wavelength conversion member 30 against the support member 41, thereby adjusting the temperature of the wavelength conversion member 30. Other configurations of the light source device 121 of this modified example are similar to other configurations of the light source device 21 of the above-described first embodiment.

[0096] The temperature control of this modified example is similar to that of the first embodiment. That is, when the temperature Tg of the wavelength conversion member 30 is lower than the first temperature T1, the control unit 90 reduces the set pressing force Fp based on the conversion table Tb1 and the temperature Tg of the wavelength conversion member 30. Next, the control unit 90 adjusts the pressing force Fp to the newly set pressing force Fp using the temperature adjustment unit 170, thereby reducing the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41 and preventing the temperature of the wavelength conversion member 30 from becoming too low. When the temperature Tg of the wavelength conversion member 30 is higher than the second temperature T2, the control unit 90 increases the set pressing force Fp. Next, the control unit 90 adjusts the pressing force Fp to the newly set pressing force Fp using the temperature adjustment unit 170, thereby increasing the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41 and preventing the temperature of the wavelength conversion member 30 from becoming too high. As a result, in the temperature control of this modified example, it is possible to prevent the temperature Tg of the wavelength conversion member 30 from becoming too low or too high.

[0097] According to this modification, the control unit 90 controls the temperature adjustment unit 170 based on the temperature Tg of the wavelength conversion member 30, i.e., the characteristic value Vc. Therefore, while the light source device 121 is operating, it is possible to prevent the temperature Tg of the wavelength conversion member 30 from becoming too high, as described above. Therefore, as described above, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member 30, and it is also possible to prevent a decrease in the quality of the image projected by the projector 101.

[0098] (Second Modification) A projector 201 according to a second modified example of the first embodiment will be described below. The basic configuration of the projector 201 of this modified example is similar to that of the projector 1 of the first embodiment, and the projector 201 of this modified example includes a pressing unit 260 and a temperature adjustment unit 270. In the following description, the same components as those of the projector 1 of the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0099] 9 is a cross-sectional view of a light source device 221 of this modified example. The light source device 221 includes a pressing unit 260 and a temperature adjustment unit 270. The pressing unit 260 presses the wavelength conversion member 30 against the support member 41. In this modified example, the pressing unit 260 includes a pressing member 261 and screws 263a and 263c.

[0100] The pressing member 261 presses the wavelength conversion member 30 against the support member 41. The pressing member 261 is a leaf spring extending in the Z-axis direction. The pressing member 261 has elasticity. One end 261a of the pressing member 261 is fixed to the first inner surface 49b by a screw 263a. The other end 261c of the pressing member 261 is fixed to the second inner surface 49g by a screw 263c. The central portion of the pressing member 261 presses the first surface 30a of the wavelength conversion member 30 from the -Y side. The pressing force Fp with which the pressing unit 260 presses the wavelength conversion member 30 can be adjusted by the temperature adjustment unit 270.

[0101] In this modified example, temperature adjustment unit 270 adjusts the pressure applied to the center of pressing member 261 toward the +Y side. In this modified example, temperature adjustment unit 270 has air cylinder 271. Air cylinder 271 adjusts the pressure applied to the center of pressing member 261 toward the +Y side. This allows temperature adjustment unit 270 to adjust the pressing force Fp applied by pressing unit 260 to wavelength conversion member 30.

[0102] The greater the pressure applied by the temperature adjustment unit 270 to the central portion of the pressing member 261, the greater the pressing force Fp. The greater the pressing force Fp, the greater the amount of heat transferred from the wavelength conversion member 30 to the support member 41, thereby enabling the temperature of the wavelength conversion member 30 to be lowered. Furthermore, the smaller the pressure applied by the temperature adjustment unit 270 to the central portion of the pressing member 261, the smaller the pressing force Fp. The smaller the pressing force Fp, the less the amount of heat transferred from the wavelength conversion member 30 to the support member 41, thereby enabling the temperature of the wavelength conversion member 30 to be increased. Therefore, the temperature adjustment unit 270 adjusts the temperature of the wavelength conversion member 30 by adjusting the pressing force Fp applied by the pressing unit 260 to press the wavelength conversion member 30 against the support member 41. Other configurations of the light source device 221 of this modified example are similar to those of the light source device 21 of the first embodiment described above. Furthermore, the temperature control of this modified example is similar to that of the first embodiment described above.

[0103] According to this modification, the control unit 90 controls the temperature adjustment unit 270 based on the temperature Tg of the wavelength conversion member 30, i.e., the characteristic value Vc. Therefore, while the light source device 221 is operating, it is possible to prevent the temperature Tg of the wavelength conversion member 30 from becoming too high, as described above. Therefore, as described above, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member 30, and it is also possible to prevent a decrease in the quality of the image projected by the projector 201.

[0104] (Second embodiment) A projector 301 according to the second embodiment will be described below. The basic configuration of the projector 301 of this embodiment is similar to that of the projector 1 of the first embodiment, and the projector 301 of this embodiment includes a measurement unit 395 and a mirror 396. In the following description, the same components as those of the projector 1 of the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0105] FIG. 10 is a schematic configuration diagram of a first illumination device 320 of this embodiment. As described above, the light source device 321 of this embodiment includes a measurement unit 395 and a mirror 396. As shown in FIG. 10 , in this embodiment, the mirror 396 is disposed between the angle conversion member 38 and the first lens array 52. ​​More specifically, the mirror 396 is disposed between the outer edge of the angle conversion member 38 and the outer edge of the first lens array 52. ​​The mirror 396 reflects a portion of the second light L2 emitted from the emission surface 38b of the angle conversion member 38 toward the measurement unit 395. As a result, a portion of the second light L2 is incident on the measurement unit 395. Note that the location where the mirror 396 is disposed is not particularly limited. For example, the mirror 396 may be disposed between the first lens array 52 and the second lens array 53, or may be disposed on the emission side of the superimposing optical system 56.

[0106] In this embodiment, the measurement unit 395 is a known spectrophotometer capable of measuring the chromaticity of light. In this embodiment, the measurement unit 395 measures the chromaticity Cr of the second light L2. As described above, when the temperature Tg of the wavelength conversion member 30 becomes too high, the light intensity of the second light L2 in the wavelength range of 490 nm to 600 nm decreases, and the wavelength spectrum shifts to the longer wavelength side. In other words, when the temperature Tg of the wavelength conversion member 30 becomes too high, the chromaticity Cr of the second light L2 shifts to the longer wavelength side. In other words, the chromaticity Cr of the second light L2 correlates with the temperature Tg of the wavelength conversion member 30. In this embodiment, the characteristic value Vc correlated with the temperature Tg of the wavelength conversion member 30 is the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30, i.e., the light-guiding member. Note that, although not shown, the configurations of the pressing unit 60 and the temperature adjustment unit 70 of this embodiment are similar to those of the pressing unit 60 and the temperature adjustment unit 70 of the first embodiment. Therefore, the temperature adjusting unit 70 adjusts the pressing force Fp with which the pressing unit 60 presses the wavelength conversion member 30 against the support member 41. Other configurations of the light source device 321 of this embodiment are similar to other configurations of the light source device 21 of the above-described first embodiment.

[0107] In this embodiment, the control unit 90 is connected to both the measurement unit 395 and the temperature adjustment unit 70. The storage unit 91 stores a conversion table Tb2 that defines the relationship between the chromaticity Cr of the second light L2 measured by the measurement unit 395 and the pressing force Fp.

[0108] 11 is a flowchart showing the temperature control of this embodiment. In the temperature control of this embodiment, the chromaticity Cr of the second light L2 is maintained within a predetermined chromaticity range Rc. First, the control unit 90 sets a chromaticity range Rc (S210). The chromaticity range Rc may be a predetermined chromaticity range Rc, or may be a chromaticity range Rc appropriately determined based on the environmental conditions in which the light source device 21 is placed, such as the temperature of the environment in which the projector 1 is installed and the temperature inside the projector 1. Next, the control unit 90 acquires the chromaticity Cr of the second light L2 measured by the measurement unit 395, i.e., the characteristic value Vc (S211). If the chromaticity Cr of the second light L2 is outside the chromaticity range Rc (in this embodiment, if the chromaticity Cr of the second light L2 deviates toward the longer wavelength side than the chromaticity range Rc) (S212), the control unit 90 sets the pressing force Fp to a new pressing force Fp(Tg) based on the conversion table Tb2 and the chromaticity Cr of the second light L2 (S213). This allows the currently set pressing force Fp to be increased. Next, the control unit 90 controls the temperature adjustment unit 70 to adjust the pressing force Fp to the newly set pressing force Fp. That is, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30 deviates toward the longer wavelength side from the predetermined chromaticity range Rc, the control unit 90 increases the pressing force Fp by the temperature adjustment unit 70. This increases the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41, thereby increasing the amount of heat transferred from the wavelength conversion member 30 to the support member 41. Therefore, it is possible to prevent the temperature of the wavelength conversion member 30 from becoming too high.

[0109] According to this embodiment, the characteristic value Vc is the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30, i.e., the light guide member, and the temperature adjustment unit 70 adjusts the pressing force Fp with which the pressing unit 60 presses the wavelength conversion member 30 against the support member 41. Therefore, while the light source device 321 is operating, it is possible to adjust the amount of heat transferred from the wavelength conversion member 30 to the support member 41. This makes it possible to adjust the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 321 via the support member 41 based on the chromaticity Cr of the second light L2, which is the characteristic value Vc related to the temperature Tg of the wavelength conversion member 30, thereby preventing the temperature of the wavelength conversion member 30 from becoming too high. Therefore, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member 30 and a decrease in the quality of the image projected by the projector 301.

[0110] According to the present embodiment, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30 deviates toward the long wavelength side from the predetermined chromaticity range Rc, the control unit 90 increases the pressing force Fp using the temperature adjustment unit 70. Therefore, as described above, when the temperature Tg of the wavelength conversion member 30 increases, the temperature adjustment unit 70 can increase the amount of heat transferred from the wavelength conversion member 30 to the support member 41. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 321 via the support member 41 can be increased, and the temperature of the wavelength conversion member 30 can be prevented from becoming too high.

[0111] (Third embodiment) A projector 401 according to the third embodiment will be described below. The basic configuration of the projector 401 of this embodiment is similar to that of the projector 1 of the first embodiment, and the projector 401 of this embodiment includes a heat dissipation unit 447 and a temperature adjustment unit 470. In the following description, the same components as those of the projector 1 of the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.

[0112] FIG. 12 is a schematic configuration diagram of the first lighting device 420 of this embodiment. As described above, the light source device 421 of this embodiment includes the heat dissipation unit 447 and the temperature adjustment unit 470. As shown in FIG. 12, the heat dissipation unit 447 is a heat sink fixed to the surface of the support member 41 facing the +Y side. The heat dissipation unit 447 is made of metal. In this embodiment, the heat dissipation unit 447 is made of aluminum. The thermal conductivity of the heat dissipation unit 447 is preferably higher than the thermal conductivity of the support member 41. The heat dissipation unit 447 has a plurality of heat dissipation fins 447a.

[0113] Each heat dissipation fin 447a protrudes in the incident direction (Y-axis direction). Although not shown, each heat dissipation fin 447a is plate-shaped and extends in the Z-axis direction. Each heat dissipation fin 447a is arranged at intervals from one another along the longitudinal direction (X-axis direction). Note that each heat dissipation fin 447a may be plate-shaped and extend in the longitudinal direction. In this case, each heat dissipation fin 447a is arranged at intervals from one another along the Z-axis direction. In this embodiment, since the heat dissipation unit 447 has multiple heat dissipation fins 447a, the surface area of ​​the heat dissipation unit 447 can be increased. This can increase the amount of heat dissipated from the support member 41 to the outside of the light source device 421 via the heat dissipation unit 447. Therefore, it can increase the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 41 and the heat dissipation unit 447. Note that the light source device 421 does not necessarily have to include the heat dissipation unit 447.

[0114] In this embodiment, the temperature adjustment unit 470 is an air blower 474 that sends air to at least one of the support member 41 and the wavelength conversion member 30. That is, the light source device 421 is provided with the air blower 474. In this embodiment, the air blower 474 is a blower fan. In this embodiment, the temperature adjustment unit 470 sends air to each of the support member 41 and the heat dissipation unit 447. The temperature adjustment unit 470 may also send air to the wavelength conversion member 30. In this embodiment, the temperature adjustment unit 470 adjusts the amount of airflow Af sent by the air blower 474 to each of the support member 41 and the heat dissipation unit 447 by changing the rotation speed of the blower fan.

[0115] The larger the airflow rate Af sent by the temperature adjustment unit 470 to each of the support member 41 and the heat dissipation unit 447, the larger the amount of heat dissipated from each of the support member 41 and the heat dissipation unit 447 to the outside of the light source device 421. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 41 and the heat dissipation unit 447 can be increased. This can lower the temperature of the wavelength conversion member 30. Furthermore, the smaller the airflow rate Af sent by the temperature adjustment unit 470 to each of the support member 41 and the heat dissipation unit 447, the smaller the amount of heat dissipated from each of the support member 41 and the heat dissipation unit 447 to the outside of the light source device 421. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 41 and the heat dissipation unit 447 can be reduced. This can increase the temperature of the wavelength conversion member 30. Therefore, the temperature adjusting section 470 adjusts the amount of air Af sent by the air blowing section 474 to each of the support member 41 and the heat dissipating section 447, thereby adjusting the temperature of the wavelength converting member 30.

[0116] The measuring unit 95 of this embodiment measures the temperature Tg of the wavelength conversion member 30, similar to the measuring unit 95 of the first embodiment. That is, in this embodiment, the characteristic value Vc correlated with the temperature Tg of the wavelength conversion member 30 is the temperature Tg of the wavelength conversion member 30. Other configurations of the light source device 421 of this embodiment are similar to other configurations of the light source device 21 of the first embodiment described above.

[0117] In the present embodiment, the control unit 90 is connected to each of the measurement unit 95 and the temperature adjustment unit 470. The storage unit 91 stores a conversion table Tb3 that defines the relationship between the temperature Tg of the wavelength conversion member 30 measured by the measurement unit 95 and the airflow rate Af.

[0118] 13 is a flowchart showing the temperature control of this embodiment. In the temperature control of this embodiment, the temperature Tg of the wavelength conversion member 30 is maintained between a first temperature T1 and a second temperature T2. First, the control unit 90 sets a first temperature T1 and a second temperature T2 (S310). Next, the control unit 90 acquires the temperature Tg of the wavelength conversion member 30 measured by the measurement unit 95, i.e., the characteristic value Vc (S311). If the temperature Tg of the wavelength conversion member 30 is lower than the first temperature T1 (S312), the control unit 90 sets the airflow rate Af to a new airflow rate Af(Tg) based on the conversion table Tb3 and the temperature Tg of the wavelength conversion member 30 (S313). This reduces the set airflow rate Af. Next, the control unit 90 adjusts the airflow rate Af to the newly set airflow rate Af using the temperature adjustment unit 470. This reduces the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 41 and the heat dissipation unit 447. This prevents the temperature of the wavelength conversion member 30 from becoming too low.

[0119] When the temperature Tg of the wavelength conversion member 30 is equal to or higher than the first temperature T1 and is higher than the second temperature T2 (S312, S314), the control unit 90 sets the airflow rate Af to a new airflow rate Af(Tg) based on the conversion table Tb3 and the temperature Tg of the wavelength conversion member 30 (S315). This increases the set airflow rate Af. Next, the control unit 90 adjusts the airflow rate Af to the newly set airflow rate Af using the temperature adjustment unit 470. That is, when the temperature Tg of the wavelength conversion member 30 becomes higher than the predetermined temperature T2, the control unit 90 increases the airflow rate Af using the temperature adjustment unit 470. This increases the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 41 and the heat dissipation unit 447. This prevents the temperature of the wavelength conversion member 30 from becoming too high.

[0120] When increasing the airflow rate Af, the control unit 90 may set the airflow rate Af to an airflow rate greater than the set airflow rate Af(Tg) and then gradually reduce the airflow rate Af to the airflow rate Af(Tg) as shown in Fig. 14. This makes it possible to reduce the temperature Tg of the wavelength conversion member 30 with good responsiveness immediately after increasing the airflow rate Af, as shown in Fig. 15.

[0121] 13, when the temperature Tg of the wavelength conversion member 30 is equal to or higher than the first temperature T1 and equal to or lower than the second temperature T2 (S312, S314), the control unit 90 does not set a new air flow rate Af and does not cause the temperature adjustment unit 470 to adjust the air flow rate Af. For the reasons described above, in the temperature control of this embodiment, the control unit 90 controls the temperature adjustment unit 470 based on the temperature Tg of the wavelength conversion member 30, i.e., the characteristic value Vc that correlates with the temperature of the wavelength conversion member 30. In this way, the temperature control of this embodiment can prevent the temperature Tg of the wavelength conversion member 30 from becoming too low or too high.

[0122] According to the present embodiment, the light source device 421 includes an air blower 474 that blows air to at least one of the support member 41 and the wavelength conversion member 30, i.e., the light guide member. The characteristic value Vc is the temperature Tg of the wavelength conversion member 30, and the temperature adjustment unit 470 adjusts the amount of airflow Af that the air blower 474 blows to at least one of the support member 41 and the wavelength conversion member 30. Therefore, in the present embodiment, while the light source device 421 is operating, the amount of heat dissipated from the support member 41 to the outside of the light source device 421 can be adjusted as described above. This allows the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 41 to be adjusted based on the temperature Tg of the wavelength conversion member 30, thereby preventing the temperature of the wavelength conversion member 30 from becoming too high. This prevents a decrease in the wavelength conversion efficiency of the wavelength conversion member 30 and a decrease in the quality of the image projected by the projector 401.

[0123] According to the present embodiment, when the temperature Tg of the wavelength conversion member 30 becomes higher than the predetermined temperature T2, the control unit 90 increases the airflow rate Af by the temperature adjustment unit 470. Therefore, as described above, the temperature adjustment unit 470 can increase the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 via the support member 41, thereby preventing the temperature of the wavelength conversion member 30 from becoming too high.

[0124] Furthermore, in this embodiment, light source device 421 has the above-mentioned heat dissipation section 447, and temperature adjustment section 470 sends air to both support member 41 and heat dissipation section 447. Therefore, as described above, the amount of heat dissipated from wavelength conversion member 30 to the outside of light source device 421 can be increased, and therefore the temperature of wavelength conversion member 30 can be more suitably prevented from becoming too high.

[0125] (Fourth embodiment) A projector 501 according to the fourth embodiment will be described below. The basic configuration of the projector 501 of this embodiment is similar to that of the projector 401 of the fourth embodiment, and the projector 501 of this embodiment includes a measurement unit 395 and a mirror 396. In the following description, the same components as those of the projector 401 of the fourth embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0126] FIG. 16 is a schematic diagram of a first lighting device 520 of this embodiment. As described above, the light source device 521 of this embodiment includes a measurement unit 395 and a mirror 396. The configurations of the measurement unit 395 and the mirror 396 of this embodiment are similar to those of the measurement unit 395 and the mirror 396 of the second embodiment. That is, the mirror 396 reflects a portion of the second light L2 emitted from the emission surface 38b of the angle conversion member 38 toward the measurement unit 395. The measurement unit 395 measures the chromaticity Cr of the second light L2 emitted from the wavelength conversion member 30. In this embodiment, the characteristic value Vc correlated with the temperature Tg of the wavelength conversion member 30 is the chromaticity Cr of the second light L2 emitted from the wavelength conversion member 30, i.e., the light-guiding member. The temperature adjustment unit 470 of this embodiment is similar to the temperature adjustment unit 470 of the third embodiment. Therefore, the temperature adjustment unit 470 adjusts the amount of air blown Af by the air blower 474 to at least one of the support member 41 and the wavelength conversion member 30. The light source device 421 also includes an air blower 474 that blows air to at least one of the support member 41 and the wavelength conversion member 30. Other configurations of the light source device 521 of this embodiment are similar to other configurations of the light source device 21 of the first embodiment described above.

[0127] In the present embodiment, the control unit 90 is connected to both the measurement unit 395 and the temperature adjustment unit 470. The storage unit 91 stores a conversion table Tb4 that defines the relationship between the chromaticity Cr of the second light L2 measured by the measurement unit 395 and the airflow rate Af.

[0128] 17 is a flowchart showing the temperature control of this embodiment. In the temperature control of this embodiment, the chromaticity Cr of the second light L2 is maintained within a predetermined chromaticity range Rc. First, the control unit 90 sets the chromaticity range Rc (S410). Next, the control unit 90 acquires the chromaticity Cr of the second light L2 measured by the measurement unit 395, i.e., the characteristic value Vc (S411). If the chromaticity Cr of the second light L2 is outside the chromaticity range Rc, in this embodiment, if the chromaticity Cr of the second light L2 deviates toward the longer wavelength side than the chromaticity range Rc (S412), the control unit 90 sets the airflow rate Af to a new airflow rate Af(Tg) based on the conversion table Tb4 and the chromaticity Cr of the second light L2 (S413). This allows the currently set airflow rate Af to be increased. Next, the control unit 90 controls the temperature adjustment unit 470 to adjust the airflow rate Af to the newly set airflow rate Af. That is, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30 deviates toward the long wavelength side from the predetermined chromaticity range Rc, the control unit 90 increases the airflow rate Af by the temperature adjustment unit 470. This increases the amount of heat dissipated from the support member 41 and the heat dissipation unit 447. Therefore, it is possible to prevent the temperature of the wavelength conversion member 30 from becoming too high.

[0129] According to this embodiment, the light source device 521 includes an air blower 474 that blows air to at least one of the support member 41 and the wavelength conversion member 30. The characteristic value Vc is the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30. The temperature adjustment unit 470 adjusts the amount of airflow Af sent by the air blower 474 to at least one of the support member 41 and the wavelength conversion member 30. Therefore, while the light source device 521 is operating, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 521 via the support member 41 can be adjusted. Therefore, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 521 via the support member 41 can be adjusted based on the chromaticity Cr of the second light L2, which is the characteristic value Vc related to the temperature Tg of the wavelength conversion member 30. This prevents the temperature of the wavelength conversion member 30 from becoming too high. Therefore, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member 30 and a decrease in the quality of the image projected by the projector 501.

[0130] According to the present embodiment, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30 deviates toward the long wavelength side from the predetermined chromaticity range Rc, the control unit 90 increases the airflow rate Af by the temperature adjustment unit 470. Therefore, as described above, when the temperature of the wavelength conversion member 30 becomes high, the temperature adjustment unit 470 can increase the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 521 via the support member 41. Therefore, it is possible to prevent the temperature of the wavelength conversion member 30 from becoming too high.

[0131] Although the embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. Furthermore, one aspect of the present invention can be a configuration in which the characteristic portions of the above-described embodiments are appropriately combined.

[0132] In the above-described embodiment, an example was given in which the present invention was applied to a light source device including a wavelength conversion member, but instead of this configuration, the present invention may be applied to a light source device in which incident light is propagated without wavelength conversion and then, for example, the angular distribution is controlled and the light is emitted. In this case, the wavelength conversion member in the above-described embodiment is replaced by a light guide member, and the light emitted from the light emitting element is emitted to the angle conversion member as light of the original wavelength band.

[0133] The specific descriptions of the shape, number, arrangement, materials, etc. of each component of the light source device and the projector are not limited to the above-described embodiments and can be modified as appropriate. Furthermore, in the above-described embodiments, an example was shown in which the light source device according to the present invention was mounted in a projector using a liquid crystal panel, but this is not limiting. The light source device according to the present invention may also be applied to a projector using a digital micromirror device as a light modulation device. Furthermore, the projector does not need to have multiple light modulation devices, and may have only one light modulation device.

[0134] In the above embodiment, the light source device of the present invention is applied to a projector, but the present invention is not limited to this. The light source device of the present invention can also be applied to lighting fixtures, automobile headlights, and the like.

[0135] Summary of this disclosure A summary of this disclosure is provided below.

[0136] (Appendix 1) a light source device comprising: a light source unit having a light-emitting element that emits light; a light-guiding member that receives the light emitted from the light-emitting element and emits the light; a support member that supports the light-guiding member; a pressing unit that presses the light-guiding member against the support member; a measurement unit that measures a characteristic value that correlates with a temperature of the light-guiding member; a control unit that acquires the characteristic value measured by the measurement unit; and a temperature adjustment unit that adjusts the temperature of the light-guiding member, wherein the control unit controls the temperature adjustment unit based on the characteristic value.

[0137] With a light source device having this configuration, it is possible to prevent the temperature of the wavelength conversion member from becoming too high while the light source device is operating. This prevents an increase in temperature quenching of the second light in the wavelength conversion member, thereby preventing a decrease in the wavelength conversion efficiency of the wavelength conversion member. It is also possible to prevent a decrease in the color gamut of the second light emitted by the wavelength conversion member. Therefore, it is possible to prevent a decrease in the quality of the image projected by the projector.

[0138] (Appendix 2) The light source device according to claim 1, wherein the characteristic value is a temperature of the light-guiding member, and the temperature adjusting unit adjusts a pressing force with which the pressing unit presses the light-guiding member against the support member.

[0139] According to this configuration, the contact area between the second surface of the wavelength conversion member and the support surface of the support member can be adjusted, thereby adjusting the amount of heat transferred from the wavelength conversion member to the support member. Therefore, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member can be adjusted based on the temperature of the wavelength conversion member, preventing the temperature of the wavelength conversion member from becoming too high. Therefore, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member and a decrease in the quality of images projected by the projector.

[0140] (Appendix 3) The light source device according to claim 2, wherein the control unit increases the pressing force by the temperature adjustment unit when the temperature of the light-guiding member becomes higher than a predetermined temperature.

[0141] According to this configuration, when the temperature of the wavelength conversion member becomes higher than a predetermined temperature, the contact area between the second surface and the support surface can be increased, thereby increasing the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member, thereby preventing the temperature of the wavelength conversion member from becoming too high.

[0142] (Appendix 4) The light source device according to claim 1, further comprising a blower that blows air to at least one of the support member and the light guiding member, wherein the characteristic value is a temperature of the light guiding member, and the temperature adjustment unit adjusts the amount of air blown by the blower to at least one of the support member and the light guiding member.

[0143] According to this configuration, while the light source device is operating, the amount of heat dissipated from the support member to the outside of the light source device can be adjusted. This allows the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member to be adjusted based on the temperature of the wavelength conversion member, thereby preventing the temperature of the wavelength conversion member from becoming too high. This prevents a decrease in the wavelength conversion efficiency of the wavelength conversion member and a decrease in the quality of images projected by the projector.

[0144] (Appendix 5) The light source device according to claim 4, wherein the control unit increases the airflow rate by the temperature adjustment unit when the temperature of the light-guiding member becomes higher than a predetermined temperature.

[0145] According to this configuration, when the temperature of the wavelength conversion member becomes higher than a predetermined temperature, the temperature adjustment unit can increase the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member, thereby preventing the temperature of the wavelength conversion member from becoming too high.

[0146] (Appendix 6) the characteristic value is the chromaticity of the light emitted by the light-guiding member, The light source device according to claim 1, wherein the temperature adjusting unit adjusts the pressing force with which the pressing unit presses the light guide member against the support member.

[0147] According to this configuration, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member can be adjusted based on the chromaticity of the second light, which is a characteristic value related to the temperature of the wavelength conversion member, thereby preventing the temperature of the wavelength conversion member from becoming too high. As a result, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member and a decrease in the quality of the image projected by the projector.

[0148] (Appendix 7) The light source device according to claim 6, wherein the control unit increases the pressing force by the temperature adjustment unit when the chromaticity of the light emitted by the light-guiding member deviates from a predetermined chromaticity range toward the long wavelength side.

[0149] With this configuration, when the temperature of the wavelength conversion member rises, the temperature adjustment unit can increase the amount of heat transferred from the wavelength conversion member to the support member, thereby increasing the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member, thereby preventing the temperature of the wavelength conversion member from becoming too high.

[0150] (Appendix 8) The light source device according to appendix (1), further comprising an air blowing unit that blows air to at least one of the support member and the light guiding member, the characteristic value being the chromaticity of the light emitted by the light guiding member, and the temperature adjusting unit adjusting the amount of air blown by the air blowing unit to at least one of the support member and the light guiding member.

[0151] According to this configuration, while the light source device is operating, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device can be adjusted via the support member. Therefore, the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member can be adjusted based on the chromaticity of the second light, which prevents the temperature of the wavelength conversion member from becoming too high. Therefore, it is possible to prevent a decrease in the wavelength conversion efficiency of the wavelength conversion member and a decrease in the quality of the image projected by the projector.

[0152] (Appendix 9) The light source device according to claim 8, wherein the control unit increases the airflow rate by the temperature adjustment unit when the chromaticity of the light emitted by the light-guiding member deviates from a predetermined chromaticity range toward the long wavelength side.

[0153] According to this configuration, when the temperature of the wavelength conversion member becomes high, the temperature adjustment unit can increase the amount of heat dissipated from the wavelength conversion member to the outside of the light source device via the support member, thereby preventing the temperature of the wavelength conversion member from becoming too high.

[0154] (Appendix 10) The light source device according to any one of appendices (1) to (9), wherein the light-emitting element emits first light having a first wavelength band, and the light-guiding member is a wavelength conversion member that includes a phosphor, converts the first light into second light having a second wavelength band different from the first wavelength band, and emits the second light.

[0155] This configuration prevents the temperature of the wavelength conversion member from becoming too high, thereby preventing a decrease in the wavelength conversion efficiency of the wavelength conversion member and a decrease in the quality of the image projected by the projector.

[0156] (Appendix 11) A projector comprising: a light source device according to any one of Supplementary Note (1) to Supplementary Note (10); a light modulation device that modulates light emitted from the light source device; and a projection optical device that projects the light modulated by the light modulation device.

[0157] According to a projector having this configuration, the wavelength conversion efficiency of the wavelength conversion member can be increased, thereby increasing the amount of second light emitted from the wavelength conversion member. This reduces the amount of first light required to emit a predetermined amount of second light. Therefore, the amount of first light emitted by the light-emitting element can be reduced, thereby reducing the power consumed by the projector. [Explanation of symbols]

[0158] 1,101,201,301,401,501...projector, 4R,4G,4B...light modulation device, 6...projection optical device, 21,121,221,321,421,521...light source device, 30...wavelength conversion member (light-guiding member), 33...phosphor, 34...light source section, 36...light-emitting element, 41...support member, 60,160,260...pressing section, 70,170,270,470...temperature adjustment section, 90...control section, 95,395...measuring section, 474...air blowing section, Af...air blowing volume, Fp...pressing force, L1...first light (light), L2...second light (light).

Claims

1. a light source unit having a light emitting element that emits light; a light guide member that receives the light emitted from the light emitting element and emits the light; a support member that supports the light guide member; a pressing portion that presses the light guide member against the support member; a measurement unit for measuring a characteristic value correlated with the temperature of the light guide member; a control unit that acquires the characteristic value measured by the measurement unit; a temperature adjusting unit that adjusts the temperature of the light guiding member; Equipped with The control unit controls the temperature adjustment unit based on the characteristic value. Light source device.

2. the characteristic value is a temperature of the light-guiding member, the temperature adjusting unit adjusts the pressing force with which the pressing unit presses the light guide member against the support member. The light source device according to claim 1 .

3. the control unit increases the pressing force by the temperature adjustment unit when the temperature of the light guide member becomes higher than a predetermined temperature. The light source device according to claim 2 .

4. a blower for blowing air to at least one of the support member and the light guide member, the characteristic value is a temperature of the light-guiding member, the temperature adjusting unit adjusts the amount of air sent by the air blowing unit to at least one of the support member and the light guiding member. The light source device according to claim 1 .

5. the control unit increases the airflow rate by the temperature adjustment unit when the temperature of the light guide member becomes higher than a predetermined temperature. The light source device according to claim 4 .

6. the characteristic value is the chromaticity of the light emitted by the light-guiding member, the temperature adjusting unit adjusts the pressing force with which the pressing unit presses the light guide member against the support member. The light source device according to claim 1 .

7. the control unit increases the pressing force by the temperature adjustment unit when the chromaticity of the light emitted by the light guide member deviates from a predetermined chromaticity range to a longer wavelength side. The light source device according to claim 6 .

8. a blower that blows air to at least one of the support member and the light guide member, the characteristic value is the chromaticity of the light emitted by the light-guiding member, the temperature adjusting unit adjusts the amount of air sent by the air blowing unit to at least one of the support member and the light guiding member. The light source device according to claim 1 .

9. the control unit increases the airflow rate by the temperature adjustment unit when the chromaticity of the light emitted by the light-guiding member deviates from a predetermined chromaticity range to a longer wavelength side. The light source device according to claim 8 .

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

11. The light source device according to any one of claims 1 to 9; a light modulation device that modulates the light emitted from the light source device; a projection optical device that projects the light modulated by the light modulation device; Equipped with projector.

Images