Light source device and projector

Abstract

A light source device and a projector. Provided are a light source device and a projector capable of suppressing a decrease in wavelength conversion efficiency and a decrease in image quality. This light source device is provided with: a light source unit having 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 the light; a support member that supports the light guide member; a pressing part that presses the light guide member against the support member; a measurement unit that measures a characteristic value related to the 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, and the control unit controls the temperature adjustment unit on the basis of the characteristic value.

Description

TECHNICAL FIELD

[0001] The present application relates to a light source device and a projector. BACKGROUND

[0002] As a light source device for a projector, a light source device that emits fluorescent light emitted from a fluorescent body when excitation light emitted from a light emitting element is irradiated to the fluorescent body is proposed. In the following Patent Literature 1, a light source device that has a light source element that emits excitation light and a wavelength conversion member that includes a fluorescent body that converts the excitation light into fluorescent light is disclosed.

[0003] Patent Literature 1: Japanese Patent Application Publication No. 2023-108325

[0004] In the technology described in Patent Literature 1, when the fluorescent body included in the wavelength conversion member absorbs the excitation light, the temperature of the wavelength conversion member rises. When the temperature of the wavelength conversion member becomes excessively high, the temperature quenching of the fluorescent light in the wavelength conversion member can increase. Therefore, the wavelength conversion efficiency, which is the efficiency with which the wavelength conversion member converts the excitation light into the fluorescent light, can decrease. In addition, when the temperature of the wavelength conversion member becomes excessively high, the color gamut of the fluorescent light emitted from the wavelength conversion member can decrease. Therefore, the image quality projected by the projector can decrease. SUMMARY

[0005] To solve the above problem, a light source device of one embodiment of the present application includes a light source portion including a light emitting element that emits light; a light guide member that guides the light emitted from the light emitting element and emits 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 portion that measures a characteristic value related to the temperature of the light guide member; a control portion that acquires the characteristic value measured by the measurement portion; and a temperature adjustment portion that adjusts the temperature of the light guide member, and the control portion controls the temperature adjustment portion on the basis of the characteristic value.

[0006] A projector of one embodiment of the present application includes a light source device of one embodiment of the present application; a light modulation device that modulates light emitted from the light source device; and a projection optical device that projects light modulated by the light modulation device. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 FIG. 1 is a schematic configuration diagram of a projector of one embodiment.

[0008] Figure 2 FIG. 2 is a schematic configuration diagram of a first light source device.

[0009] Figure 3 FIG. 4 is a top view of a light source device viewed from an incident direction.

[0010] Figure 4 It is along Figure 3 A cross-sectional view of the light source device along line IV-IV.

[0011] Figure 5 It is along Figure 3 A cross-sectional view of the VV line light source device.

[0012] Figure 6 This is a graph showing the wavelength spectrum of the second light.

[0013] Figure 7 This is a flowchart illustrating temperature control.

[0014] Figure 8 This is a cross-sectional view of a light source device according to a first variation of an embodiment.

[0015] Figure 9 This is a cross-sectional view of a light source device according to a second variation of an embodiment.

[0016] Figure 10 This is a schematic structural diagram of the first lighting device according to the second embodiment.

[0017] Figure 11 This is a flowchart illustrating the temperature control in the second embodiment.

[0018] Figure 12 This is a schematic structural diagram of the first lighting device according to the third embodiment.

[0019] Figure 13 This is a flowchart illustrating the temperature control in the third embodiment.

[0020] Figure 14 This is a graph showing the shift in air volume according to the third embodiment.

[0021] Figure 15 This is a graph showing the temperature shift of the light guide component in the third embodiment.

[0022] Figure 16 This is a schematic structural diagram of the first lighting device in the fourth embodiment.

[0023] Figure 17 This is a flowchart illustrating the temperature control in the fourth embodiment.

[0024] Label Explanation

[0025] 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 component (light guide component); 33: Phosphor; 34: Light source section; 36: Light-emitting element; 41: Support component; 60, 160, 260: Pressing section; 70, 170, 270, 470: Temperature adjustment section; 90: Control section; 95, 395: Measuring section; 474: Air supply section; Af: Air volume; Fp: Pressing pressure; L1: First light (light); L2: Second light (light). Detailed Implementation

[0026] The embodiments of the present invention will be described below.

[0027] The projector in this embodiment is an example of a projector that uses a liquid crystal panel as a light modulation device.

[0028] In the following figures, the scales of the dimensions are sometimes different depending on the structural elements so as to facilitate observation of the various structural elements.

[0029] Hereinafter, the XYZ orthogonal coordinate system will be used for explanation as needed in the accompanying drawings. The X-axis is the axis extending in the extending direction of the light guide member in the embodiments described below. In the following explanation, the direction in which the X-axis extends (X-axis direction) is sometimes referred to as the "long side direction". The Z-axis is the axis along the vertical direction of the projector. In the following explanation, the direction in which the Z-axis extends is referred to as the Z-axis direction. The Y-axis is the axis perpendicular to both the X-axis and the Z-axis. In the following explanation, the direction in which the Y-axis extends (Y-axis direction) is sometimes referred to as the "incident direction". The incident direction is the direction in which the first light is incident on the light guide member. Additionally, the incident direction is the direction in which the first light, i.e., the light, is emitted from the light source. In the following explanation, the side in which the arrow of the X-axis points is called the +X side, and the opposite side is called the -X side; the side in which the arrow of the Y-axis points is called the +Y side, and the opposite side is called the -Y side; the side in which the arrow of the Z-axis points is called the +Z side, and the opposite side is called the -Z side.

[0030] Implementation Method 1

[0031] Figure 1 This is a schematic structural diagram of the projector 1 according to this embodiment. (As shown...) Figure 1As shown, projector 1 is a projection-type image display device that displays color images on a screen SCR, which serves as the projection surface. Projector 1 includes three light modulation devices 4R, 4G, and 4B corresponding to each color light: red light LR, green light LG, and blue light LB. Projector 1 includes a first illumination device 20, a second illumination device 80, a color separation optical system 3, light modulation devices 4R, 4G, and 4B, a light combining element 5, and a projection optical device 6.

[0032] The first illumination device 20 emits a yellow second light L2 towards the color separation optical system 3. The second light L2 is emitted from the light source device 21 provided with the first illumination device 20. The second illumination device 80 emits a blue light LB towards the light modulation device 4B. The detailed structure of the first illumination device 20 and the second illumination device 80 will be described later.

[0033] The first optical axis J1 shown appropriately in each figure is the central axis of the second light L2 emitted from the first illumination device 20. Figure 1 The second optical axis J2 shown is the central axis of the blue light LB emitted from the second illumination device 80. The first optical axis J1 and the second optical axis J2 extend in a direction parallel to the long side direction (X-axis direction).

[0034] 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.

[0035] Dichroic mirror 7 separates the second light L2 into red light LR and green light LG. Dichroic mirror 7 allows red light LR to pass through and reflects green light LG. A second reflector 8b is positioned in the optical path of green light LG. The second reflector 8b reflects the green light LG reflected by dichroic mirror 7 towards the light modulation device 4G. A first reflector 8a is positioned in the optical path of red light LR. The first reflector 8a reflects the red light LR that has passed through dichroic mirror 7 towards the light modulation device 4R.

[0036] Blue light LB emitted from the second illumination device 80 is reflected by the reflector 9 towards the light modulation device 4B. The second illumination device 80 includes 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 towards the condenser lens 82. Furthermore, the second light source unit 81 is not limited to a semiconductor laser, but may also be composed of an LED that emits blue light.

[0037] The condenser lens 82 is a convex lens. The condenser lens 82 focuses the blue light LB emitted from the second light source 81 onto 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 with a uniform light distribution. The diffuser plate 83 may be, for example, made of frosted glass made of optical glass.

[0038] Blue light LB, diffused by diffuser plate 83, is incident on rod lens 84. Rod lens 84 has a prismatic shape extending along the second optical axis J2. Rod lens 84 has a light incident end face 84a at one end and a light emitting end face 84b at the other end. Diffuser plate 83 is fixed to light incident end face 84a of rod lens 84 by means of optical adhesive (not shown). Preferably, the refractive index of diffuser plate 83 is as consistent as possible with the refractive index of rod lens 84.

[0039] Blue light LB undergoes total internal reflection and propagates within the rod lens 84, thus exiting from the light-emitting end face 84b with improved uniformity of illuminance distribution. The blue light LB emitted from the rod lens 84 is incident on the relay lens 85. The relay lens 85 directs the blue light LB, whose illuminance distribution uniformity has been improved by the rod lens 84, onto the reflecting mirror 9. The shape of the light-emitting end face 84b of the rod lens 84 is a rectangle, approximately similar in shape to the image-forming area of ​​the light modulation device 4B. Therefore, the blue light LB emitted from the rod lens 84 is efficiently incident on the image-forming area of ​​the light modulation device 4B.

[0040] The light modulation device 4R modulates the red light LR according to the image information to form an image light corresponding to the red light LR. The light modulation device 4G modulates the green light LG according to the image information to form an image light corresponding to the green light LG. The light modulation device 4B modulates the blue light LB according to the image information to form an image light corresponding to the blue light LB. For example, a transmissive liquid crystal panel can be used as each of the light modulation devices 4R, 4G, and 4B. Polarizing plates (not shown) are arranged on the incident and emission sides of each of the light modulation devices 4R, 4G, and 4B. The polarizing plates allow only linearly polarized light in a specific direction to pass through. As described above, the red light LR and the green light LG are obtained by separating the second light L2 using the dichroic mirror 7. Thus, the light modulation devices 4R and 4G modulate the second light L2, that is, the light emitted from the light source device 21.

[0041] A field lens 10R is disposed on the incident side of the optical modulation device 4R. The field lens 10R parallelizes the principal 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 parallelizes the principal 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 parallelizes the principal ray of the blue light LB incident on the optical modulation device 4B.

[0042] The light combining element 5 combines the image light modulated in the light modulation devices 4R, 4G, and 4B, respectively, and emits the combined image light into the projection optical device 6. For example, a cross-shaped dichroic prism can be used as the light combining element 5.

[0043] The projection optics 6 consists of multiple projection lenses (not shown). The projection optics 6 amplifies and projects the image light synthesized in the light combining element 5 onto the SCR screen. The projection optics 6 also projects light modulated by the light modulation devices 4R, 4G, and 4B onto the SCR screen. Thus, a color image is displayed on the SCR screen.

[0044] Figure 2 This is a schematic structural diagram of the first lighting device 20. Figure 3 This is a top view of the light source device 21 as seen from the incident direction (Y-axis direction). Figure 4 It is along Figure 3 A cross-sectional view of the light source device 21 of the IV-IV line. Figure 5 It is along Figure 3 A cross-sectional view of the VV-line light source device 21. (See attached image.) Figure 2 As shown, the first illumination device 20 includes a light source device 21, an integrating optical system 50, a polarization conversion element 55, and an overlapping optical system 56.

[0045] The light source device 21 converts the first light L1 into a yellow second light L2 and emits the second light L2 into the integrating optical system 50. The light source device 21 includes a wavelength conversion unit 30, a light source unit 34, an angle conversion unit 38, a reflector 40, a support unit 41, a control unit 90, and a measurement unit 95. Figure 5 As shown, the light source device 21 includes a pressing part 60 and a temperature adjustment part 70. The wavelength conversion member 30 in this embodiment corresponds to the "light guide member" in the claims. Therefore, the light source device 21 includes a light guide member.

[0046] like Figure 2As shown, the wavelength conversion component 30 has a quadrangular prism shape extending along its long side (X-axis direction) and has six faces. The dimensions of the wavelength conversion component 30 along its long side are larger than the dimensions along the incident direction (Y-axis direction) and the Z-axis direction, respectively. The dimensions along the incident direction and the Z-axis direction of the wavelength conversion component 30 are approximately the same. Therefore, the cross-sectional shape of the wavelength conversion component 30 obtained by cutting it with a face perpendicular to the long side direction is approximately square. The cross-sectional shape of the wavelength conversion component 30 obtained by cutting it with a face perpendicular to the long side direction can also be other shapes such as rectangles.

[0047] The wavelength conversion component 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 closer to the first surface 30a. The first surface 30a and the second surface 30b face opposite sides of each other.

[0048] The wavelength conversion component 30 has a third surface 30c and a fourth surface 30d that are perpendicular to the long side direction (X-axis direction) and located on opposite sides of the long side direction. The fourth surface 30d is located on the -X side closer to the third surface 30c. The third surface 30c and the fourth surface 30d face opposite sides of each other.

[0049] like Figure 4 As shown, the wavelength conversion component 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 closer to the fifth surface 30e. The fifth surface 30e and the sixth surface 30f face opposite sides of each other.

[0050] Furthermore, the wavelength conversion component 30 does not necessarily have to be a quadrangular prism shape; for example, it can also be a triangular prism shape or a cylindrical shape. When the wavelength conversion component 30 is triangular prism shaped, the three surfaces that intersect with the third surface 30c (which is the emission end face) and the fourth surface 30d (which is the reflection end face) are combined to form a side surface. When the wavelength conversion component 30 is cylindrical shaped, a continuous curved surface that intersects with both the third surface 30c and the fourth surface 30d is used as a side surface.

[0051] like Figure 2 As shown, the wavelength conversion component 30 includes a phosphor 33, which converts a first light L1 with a first wavelength band emitted from the light source 34 into a second light L2 with a second wavelength band different from the first wavelength band. The wavelength conversion component 30 emits the second light L2 toward the angle conversion component 38. The first light L1 is emitted from the light source 34 along the incident direction (Y-axis direction) and enters the wavelength conversion component 30 from the first surface 30a. After being guided inside the wavelength conversion component 30, the second light L2 is emitted from the third surface 30c toward the angle conversion component 38.

[0052] In this embodiment, the phosphor 33 is a ceramic phosphor composed of a polycrystalline phosphor that converts the first light L1 into the second light L2. The second light L2 has a second wavelength band, for example, a yellow band of 490 nm to 900 nm. That is, the second light L2 is a yellow fluorescence containing red and green light components. Alternatively, the phosphor 33 can also be a single-crystal phosphor. Furthermore, the wavelength conversion component 30 can also be made of fluorescent glass. The wavelength conversion component 30 can also be made of a material in which multiple phosphor particles are dispersed in a binder made of glass or resin.

[0053] In this embodiment, the wavelength conversion component 30 includes, for example, a yttrium aluminum garnet (YAG) phosphor. Taking YAG:Ce containing cerium (Ce) as an activator as an example, the material used for the wavelength conversion component 30 includes materials obtained by mixing raw material powders containing constituent elements such as Y2O3, Al2O3, and CeO3 and then subjecting them to a solid-phase reaction, Y-Al-O amorphous particles obtained by wet methods such as co-precipitation or sol-gel methods, and YAG particles obtained by gas-phase methods such as spray drying, flame thermal decomposition, or thermal plasma methods.

[0054] When the first light L1 is incident on the wavelength conversion unit 30, the phosphor 33 absorbs the first light L1 and emits a second light L2 with a second wavelength. Thus, the wavelength conversion unit 30 converts the first light L1 into the second light L2. Furthermore, when the phosphor 33 absorbs the first light L1, the phosphor 33 heats up. As a result, the temperature of the wavelength conversion unit 30 rises.

[0055] The light source 34 irradiates the wavelength conversion component 30 with the first light L1. The light source 34 and the first surface 30a of the wavelength conversion component 30 are positioned opposite each other in the incident direction (Y-axis direction). Figure 4 As shown, the light source unit 34 has a substrate 35 and a light-emitting element 36. The light source unit 34 may also have other optical components such as a light guide plate, a diffuser plate, and a lens.

[0056] The substrate 35 is a plate-shaped structure extending in a direction perpendicular to the incident direction (Y-axis direction). Viewed from the incident direction, the substrate 35 is a generally rectangular shape with its long side extending along the long side direction (X-axis direction). The substrate 35 has a surface 35a. Surface 35a is the outer surface of the substrate 35 facing the +Y side. Surface 35a is opposite to the wavelength conversion member 30 in the incident direction.

[0057] A 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 is opposite to the first surface 30a of the wavelength conversion member 30 in the incident direction (Y-axis direction). The light-emitting element 36 emits a first light L1 with a first wavelength band from the light-emitting surface 36a to the first surface 30a of the wavelength conversion member 30. Thus, the first light L1 emitted from the light-emitting element 36 is incident on the wavelength conversion member 30. Figure 2 As shown, the wavelength conversion unit 30 converts the first light L1 into the second light L2 and emits the second light L2. In this embodiment, the first band is, for example, a blue to violet band of 400nm to 480nm. The peak wavelength of the first light L1 is, for example, 445nm.

[0058] 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. Each light-emitting element 36 is arranged at intervals along its long side (X-axis direction). Each light-emitting element 36 is opposite to the first surface 30a in the incident direction (Y-axis direction). The number of light-emitting elements 36 in the light source unit 34 is not particularly limited, and can be three or less, or five or more.

[0059] The support member 41 extends along its long side (X-axis direction) and supports the wavelength conversion member 30, i.e., the light guide member. Heat generated by the wavelength conversion member 30 is transferred to the support member 41 and dissipated to the outside of the light source device 21. Therefore, the support member 41 is preferably made of a material with a specified strength and high thermal conductivity. Aluminum and stainless steel can be used as materials for the support member 41, and aluminum alloys such as 6061 series are particularly preferred. In this embodiment, the support member 41 is made of aluminum. Figure 4 As shown, viewed from the long side, the support member 41 has a U-shaped form. Figure 3 As shown, the support member 41 has a support groove 41a, a side wall portion 41c, a first storage portion 48a, a second storage portion 48b, a third storage portion 48c, a fourth storage portion 48d, a fifth storage portion 48e, a sixth storage portion 48f, a first recess 49a, and a second recess 49f.

[0060] like Figure 4 As shown, the support groove 41a is a groove recessed from the support member 41 towards the +Y side from the -Y side. (As...) Figure 3 As shown, the support groove 41a extends along its long side (X-axis direction). The wavelength conversion component 30 is housed within the support groove 41a. Figure 4 As shown, the support groove 41a has a support surface 43 and a side wall surface 44.

[0061] The support surface 43 is 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 component 30 in the incident direction (Y-axis direction). Thus, the support surface 43 supports the wavelength conversion component 30. The heat generated in the wavelength conversion component 30 is transferred to the support component 41 via the support surface 43 and dissipated from the outer surface of the support component 41 to the outside of the light source device 21. As a result, it is possible to prevent the temperature of the wavelength conversion component 30 from becoming too high.

[0062] The sidewall portion 41c is the portion of the support member 41 that is opposite to the wavelength conversion member 30 in the Z-axis direction. In this embodiment, the support member 41 has two sidewall portions 41c. The two sidewall portions 41c include a first sidewall portion 41e and a second sidewall portion 41f.

[0063] The first sidewall portion 41e is the part of the support member 41 located on the +Z side, which is closer to the support groove 41a. The first sidewall portion 41e faces the fifth surface 30e of the wavelength conversion member 30 with a gap in the Z-axis direction. The second sidewall portion 41f is the part of the support member 41 located on the -Z side, which is closer to the support groove 41a. The second sidewall portion 41f faces the sixth surface 30f of the wavelength conversion member 30 with a gap in the Z-axis direction. The second sidewall portion 41f faces the first sidewall portion 41e across the wavelength conversion member 30 in the Z-axis direction.

[0064] The sidewall surface 44 is the surface of the inner surface of the support groove 41a that faces the wavelength conversion component 30 in the Z-axis direction. In this embodiment, the support groove 41a has two sidewall surfaces 44. The two sidewall surfaces 44 include a first sidewall surface 45 and a second sidewall surface 46.

[0065] The first sidewall surface 45 is the surface of the outer surface of the first sidewall portion 41e facing the -Z side. The first sidewall surface 45 is opposite to the fifth surface 30e of the wavelength conversion member 30. The first sidewall surface 45 has a first portion 45a located on the side away 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.

[0066] The second sidewall 46 is the surface of the outer surface of the second sidewall portion 41f facing the +Z side. The second sidewall 46 is opposite to the sixth surface 30f of the wavelength conversion member 30. The second sidewall 46 has a third portion 46a located on the side away 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.

[0067] Figure 3 The first receiving portion 48a shown is a recess that communicates with the +X side end of the support groove 41a. The first receiving portion 48a extends to the outer edge 41h of the support member 41 on the +X side. The first receiving portion 48a receives the first protrusion 32a of the wavelength conversion member 30 that protrudes from the support groove 41a toward the +X side. In addition, the first receiving portion 48a holds the angle conversion member 38, which is fixed to the third surface 30c of the wavelength conversion member 30.

[0068] The second receiving portion 48b is a recess that communicates with the end of the support groove 41a on the -X side. The second receiving portion 48b extends to the outer edge 41h on the -X side of the support member 41. The second receiving portion 48b receives the second protrusion 32c of the wavelength conversion member 30 that protrudes from the support groove 41a toward the -X side. In addition, the second receiving portion 48b receives the reflector 40 provided on the fourth surface 30d of the wavelength conversion member 30.

[0069] The third storage portion 48c is a recess that extends from the first storage portion 48a toward the +Z side. The third storage portion 48c houses the position limiting portion 66a that holds the +Z side portion of the first protrusion 32a.

[0070] The fourth storage portion 48d is a recess that extends from the first storage portion 48a toward the -Z side. The fourth storage portion 48d houses the position limiting portion 66b that holds the portion of the first protrusion 32a on the -Z side.

[0071] The fifth storage section 48e is a recess that extends from the second storage section 48b in the +Z direction. The fifth storage section 48e houses the position limiting section 66c that holds the +Z side portion of the second protrusion 32c.

[0072] The sixth storage portion 48f is a recess that extends from the second storage portion 48b in the -Z direction. The sixth storage portion 48f houses the position limiting portion 66d that holds the portion of the second protrusion 32c on the -Z side.

[0073] Position limiting parts 66a, 66b, 66c, and 66d retain the first protrusion 32a or the second protrusion 32c protruding from the support groove 41a of the support member 41 along the long side direction (X-axis direction), limiting the position of the wavelength conversion member 30 relative to the support groove 41a. Each position limiting part 66a, 66b, 66c, and 66d is fixed to the support member 41 by screws 68. Furthermore, the position limiting parts 66a and 66b can be adjusted in the Z-axis direction relative to each other by an adjustment mechanism (not shown). Similarly, the position limiting parts 66c and 66d can be adjusted in the Z-axis direction relative to each other by an adjustment mechanism (not shown).

[0074] like Figure 5As shown, the first recess 49a is a hole recessed from the first sidewall portion 41e towards the +Y side, facing the -Y side. The first recess 49a opens towards 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. Figure 3 As shown, viewed from the incident direction, the first recess 49a is a generally rectangular shape with its long side extending along the Z-axis. The support member 41 has a plurality of first recesses 49a. In this embodiment, the support member 41 has two first recesses 49a. Each first recess 49a is separated in the long side direction (X-axis direction). Although not shown in the figure, each first recess 49a is located between a pair of light-emitting elements 36 arranged adjacent to each other in the long side direction. Figure 5 As shown, the first recess 49a has a first inner surface 49b.

[0075] The first inner surface 49b is the surface of the inner surface of the first recess 49a facing the -Y side. In the incident direction (Y-axis direction), the first inner surface 49b is located closer to the -Y side than the support surface 43. A first hole 49c is provided on the first inner surface 49b. The first hole 49c is an internally threaded hole recessed from the first inner surface 49b towards the +Y side.

[0076] The second recess 49f is a hole recessed from the second sidewall portion 41f towards the +Y side, facing the -Y side. The second recess 49f opens towards 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. Figure 3 As shown, viewed from the incident direction, the second recess 49f is a generally rectangular shape with its long side extending along the Z-axis. The support member 41 has a plurality of second recesses 49f. In this embodiment, the support member 41 has two second recesses 49f. Each second recess 49f is separated in the long side direction (X-axis direction). Each second recess 49f is opposite to a distinct first recess 49a in the Z-axis direction. Although not shown in the figure, each second recess 49f is provided between a pair of light-emitting elements arranged adjacent to each other in the long side direction. Figure 5 As shown, the second recess 49f has a second inner surface 49g.

[0077] The second inner surface 49g is the surface facing the -Y side of the inner surface of the second recess 49f. In the incident direction (Y-axis direction), the second inner surface 49g is located closer to the -Y side than the support surface 43. A second hole 49h is provided on the second inner surface 49g. The second hole 49h is an internally threaded hole recessed from the second inner surface 49g towards the +Y side.

[0078] like Figure 2As shown, the reflector 40 is disposed on the fourth surface 30d of the wavelength conversion component 30. The reflector 40 guides light inside the wavelength conversion component 30, reflecting the second light L2 arriving at the fourth surface 30d toward the third surface 30c. The reflector 40 is composed of a metal film or a dielectric multilayer film formed on the fourth surface 30d of the wavelength conversion component 30.

[0079] The first light L1 emitted from the light-emitting element 36 onto the first surface 30a enters the interior of the wavelength conversion component 30 from the first surface 30a. When the first light L1 enters the interior of the wavelength conversion component 30, the phosphor 33 is excited by the first light L1 and emits the second light L2. The second light L2 travels radially around the phosphor 33. The second light L2 traveling towards the first surface 30a, the second surface 30b, the fifth surface 30e, and the sixth surface 30f of the wavelength conversion component 30 undergoes repeated total internal reflection at each surface 30a, 30b, 30e, and 30f, and then travels towards the third surface 30c or the fourth surface 30d. The second light L2 traveling towards the fourth surface 30d is reflected by the reflector 40 and travels towards the third surface 30c. Therefore, all of the second light L2 emitted from the phosphor 33 travels towards the third surface 30c, passes through the third surface 30c, and enters the angle conversion member 38. Furthermore, as described above, when the phosphor 33 absorbs the first light L1, the phosphor 33 heats up. As a result, the temperature of the wavelength conversion member 30 rises.

[0080] Figure 6 This is a graph showing the wavelength spectrum of the second light L2 in this embodiment.

[0081] Next, the relationship between the temperature Tg of the wavelength conversion component 30 and the wavelength spectrum of the second light L2 emitted from the wavelength conversion component 30 will be explained. Figure 6 The horizontal axis represents the measurement wavelength, and the vertical axis represents the ratio of light intensity when the maximum light intensity in the emission spectrum emitted from the wavelength conversion component 30 is used as the denominator and the light intensity of each wavelength is used as the numerator. The solid line represents the wavelength spectrum of the second light L2 when the temperature Tg of the wavelength conversion component 30 is lower than the second temperature T2 described later, and the dashed line represents the wavelength spectrum of the second light L2 when the temperature Tg of the wavelength conversion component 30 is higher than the second temperature T2.

[0082] As described above, the second wavelength band of the second light L2 is, for example, the yellow band of 490nm to 900nm. The second light L2 has its maximum intensity near a wavelength of 600nm. When the temperature Tg of the wavelength conversion component 30 is higher than the second temperature T2, the light intensity in the wavelength range of 490nm to 600nm decreases, and the wavelength spectrum shifts towards the longer wavelength range. As a result, the light intensity of the green band of the second light L2 decreases, and therefore the color gamut of the second light L2 decreases. Therefore, when the temperature Tg of the wavelength conversion component 30 becomes too high, the color gamut of the color image projected by the projector 1 onto the screen SCR decreases. As a result, the image quality projected by the projector 1 onto the screen SCR decreases.

[0083] Figure 2 The angle conversion component 38 shown is disposed on the emission side of the third surface 30c of the wavelength conversion component 30. The second light L2 emitted from the third surface 30c is incident on the angle conversion component 38. The angle conversion component 38 is constructed, for example, of a light-transmitting component such as a conical rod. The angle conversion component 38 has an incident surface 38a on which the second light L2 emitted from the wavelength conversion component 30 is incident, an emission surface 38b on which the second light L2 is emitted, and a reflective surface 38c on which the second light L2 is reflected toward the emission surface 38b. The incident surface 38a and the third surface 30c are opposite each other in the long side direction (X-axis direction).

[0084] The angle conversion component 38 has a frustum-shaped quadrangular pyramid, and the cross-sectional area of ​​the section perpendicular to the first optical axis J1 extends along the travel direction of the second light L2. Therefore, the area of ​​the exit surface 38b is larger than the area of ​​the incident surface 38a. In this embodiment, the optical axis of the angle conversion component 38 is aligned with the first optical axis J1.

[0085] The second light L2 incident on the angle conversion member 38 changes its direction of travel to be approximately parallel to the first optical axis J1 whenever it undergoes total internal reflection at the reflecting side 38c. Thus, 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 at the emission surface 38b smaller than the maximum incident angle of the second light L2 at the incident surface 38a.

[0086] Typically, the optical spread of light is preserved by the product of the area of ​​the light emission region and the solid angle of the light, i.e., the maximum emission angle. Therefore, the optical spread of the second light L2 is also preserved before and after transmission through the angle conversion member 38. As described above, the angle conversion member 38 has a structure in which the area of ​​the emission surface 38b is larger than the area of ​​the incident surface 38a. Therefore, from the viewpoint of preserving the optical spread, the angle conversion member 38 can make the maximum emission angle of the second light L2 at the emission surface 38b smaller than the maximum incident angle of the second light L2 at the incident surface 38a.

[0087] Angle conversion member 38 is fixed to wavelength conversion member 30 with incident surface 38a facing the third surface 30c of wavelength conversion member 30 using an optical adhesive (not shown). That is, angle conversion member 38 and wavelength conversion member 30 are in contact via the optical adhesive, and no gap, such as an air layer, is provided between them. If a gap exists between angle conversion member 38 and wavelength conversion member 30, the second light L2 that reaches incident surface 38a at an angle greater than the critical angle will undergo total internal reflection at incident surface 38a and will not be able to reach angle conversion member 38. In contrast, as in this embodiment, without a gap between angle conversion member 38 and wavelength conversion member 30, the loss of the second light L2 that cannot reach angle conversion member 38 due to total internal reflection can be reduced. From this perspective, it is preferable that the refractive index of the angle conversion component 38 is as consistent as possible with the refractive index of the wavelength conversion component 30.

[0088] Furthermore, the structure of the angle conversion component 38 is not limited to this embodiment; for example, it can also be a compound parabolic concentrator (CPC). Even when using a CPC as the angle conversion component 38, the same effect as when using a conical rod can be obtained. Alternatively, the light source device 21 may not include the angle conversion component 38.

[0089] The integrating optical system 50 has a first lens array 52 and a second lens array 53. Together with the overlapping optical system 56, the integrating optical system 50 functions as a uniform illumination optical system, homogenizing the intensity distribution of the second light L2 emitted from the light source device 21 within the light modulation devices 4R and 4G, which serve as the illuminated area. The second light L2 emitted from the exit surface 38b of the angle conversion member 38 is incident on the first lens array 52.

[0090] The first lens array 52 has a plurality of first microlenses 52a. Each first microlens 52a is arranged in a matrix on a plane perpendicular to the first optical axis J1. Each first microlens 52a splits the second light L2 emitted from the angle conversion member 38 into multiple partial beams. The shape of each first microlens 52a is a rectangle, approximately similar in shape to the image forming area of ​​the optical modulation devices 4R and 4G. Thus, the partial beams emitted from the first lens array 52 are efficiently incident on the image forming areas of the optical modulation devices 4R and 4G, respectively.

[0091] The second lens array 53 is disposed on the emission 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. Together with the overlapping optical system 56, the second lens array 53 causes the second light L2 emitted from each of the first small lenses 52a of the first lens array 52 to be imaged near the image forming area of ​​the optical modulation devices 4R and 4G.

[0092] In this embodiment, each of the first microlenses 52a of the first lens array 52 and each of the second microlenses 53a of the second lens array 53 have the same size as each other, but they may also have different sizes. In addition, in this embodiment, the first microlenses 52a of the first lens array 52 and the second microlenses 53a of the second lens array 53 are arranged at a position that is aligned with each other's optical axes, but they may also be arranged in a state that is off-center from each other.

[0093] The polarization conversion element 55 includes: a polarization separation layer (not shown) that allows the linearly polarized component of one of the polarization components of the second light L2 emitted from the light source device 21 to pass directly through, 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 phase retardation plate (not shown) that converts the other linearly polarized component reflected by the reflection layer into a linearly polarized component of one of the polarization components. 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 the portions of the second light L2, which are divided by the first lens array 52 and emitted from the second lens array 53, into linearly polarized light.

[0094] The second light L2, passing through the polarization conversion element 55, is incident on the overlapping optical system 56. The overlapping optical system 56, in cooperation with the integrating optical system 50, constitutes a uniform illumination optical system that homogenizes the intensity distribution of the second light L2 within the light modulation devices 4R and 4G, which are the illuminated areas. The overlapping optical system 56 then directs the second light L2 onto the color separation optical system 3.

[0095] Figure 5 The pressing part 60 shown presses the wavelength conversion member 30, i.e., the light guide member, against the support member 41. More specifically, the pressing part 60 presses the second surface 30b of the wavelength conversion member 30 against the support surface 43 of the support member 41 by applying a pressing force Fp toward the +Y side. In this embodiment, the pressing part 60 includes a pressing member 61, an elastic member 62, and screws 63 and 64.

[0096] The pressing member 61 presses the wavelength conversion member 30 against the support member 41. The pressing member 61 is a leaf spring extending along the Z-axis direction. The pressing member 61 is elastic. One end 61a of the pressing member 61 is opposite to the first inner surface 49b in the incident direction (Y-axis direction). An elastic member 62 capable of elastic deformation in the incident direction is disposed between the end 61a and the first inner surface 49b. In this embodiment, the elastic member 62 is a helical spring. The elastic member 62 contacts the end 61a and the first inner surface 49b. When the screw 63 is inserted into the hole of the end 61a and screwed into the first hole 49c, the elastic member 62 applies an elastic force toward the -Y side to the end 61a. As a result, the end 61a is pressed against the head of the screw 63 from the +Y side, determining the position of the end 61a in the incident direction.

[0097] The other end 61c of the pressing member 61 is opposed to 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 both the other end 61c and the second inner surface 49g. When the screw 64 is inserted into the hole of the other end 61c and screwed into the second hole 49h, the elastic member 62 applies an elastic force to the other end 61c toward the -Y side. Thus, the other end 61c is pressed against the head of the screw 64 from the +Y side, determining the position of the incident direction of the other end 61c.

[0098] The central portion of the pressing member 61 presses against the first surface 30a of the wavelength conversion member 30 from the -Y side. Thus, the pressing member 60 presses the wavelength conversion member 30 against the support member 41. The pressing force Fp of the pressing member 60 pressing the wavelength conversion member 30 against the support member 41 is adjusted according to the positions of one end 61a and the other end 61c of the pressing member 61 in the incident direction (Y-axis direction). The closer one end 61a and the other end 61c of the pressing member 61 are to the +Y side, the greater the pressing force Fp becomes. The closer one end 61a and the other end 61c of the pressing member 61 are to the -Y side, the smaller the pressing force Fp becomes. In this embodiment, the positions of one end 61a and the other end 61c of the pressing member in the incident direction can be adjusted using the temperature adjustment unit 70.

[0099] In this embodiment, the temperature adjustment unit 70 adjusts the screw 63's insertion depth relative to the first hole 49c and the screw 64's insertion depth relative to the second hole 49h, respectively. In this embodiment, the temperature adjustment unit 70 has two motors 71. One motor 71 is connected to a shaft 72. When one motor 71 is driven, the shaft 72 rotates about an axis parallel to the incident direction. The end of the shaft 72 engages with the head of the screw 63. Thus, the screw 63's insertion depth relative to the first hole 49c can be adjusted using one motor 71. The other motor 71 is also connected to a shaft 72. When the other motor 71 is driven, the shaft 72 rotates about an axis parallel to the incident direction. The end of the shaft 72 engages with the head of the screw 64. Thus, the screw 64's insertion depth relative to the second hole 49h can be adjusted using the other motor 71.

[0100] As the screw 63 is screwed in greater amounts relative to the first hole 49c and the screw 64 is screwed in greater amounts relative to the second hole 49h, one end 61a and the other end 61c of the pressing member 61 are positioned further to the +Y side, thus increasing the pressing force Fp. The greater the pressing force Fp, the greater the contact area between the second surface 30b of the wavelength conversion member 30 and the support surface 43 of the support member 41, resulting in greater heat transfer from the wavelength conversion member 30 to the support member 41. This reduces the temperature of the wavelength conversion member 30. Conversely, as the screw 63 is screwed in less amounts relative to the first hole 49c and the screw 64 is screwed in less amounts relative to the second hole 49h, one end 61a and the other end 61c of the pressing member 61 are positioned further to the -Y side, thus decreasing the pressing force Fp. The smaller the pressing force Fp, the smaller the contact area between the second surface 30b of the wavelength conversion component 30 and the support surface 43 of the support component 41, and therefore the less heat is transferred from the wavelength conversion component 30 to the support component 41. This allows the temperature of the wavelength conversion component 30 to be increased. Therefore, the temperature adjustment unit 70 adjusts the temperature of the wavelength conversion component 30 by adjusting the pressing force Fp applied by the pressing unit 60 to the support component 41.

[0101] Figure 2The measuring unit 95 shown measures a characteristic value Vc related to the temperature Tg of the wavelength conversion component 30, i.e., the light guide component. In the following description, the characteristic value Vc related to the temperature of the wavelength conversion component 30, i.e., the light guide component, is sometimes simply referred to as "characteristic value Vc". The measuring unit 95 is mounted on the wavelength conversion component 30. In this embodiment, the measuring unit 95 is a temperature sensor. The measuring unit 95 measures the temperature Tg of the wavelength conversion component 30. That is, in this embodiment, the characteristic value Vc is the temperature Tg of the wavelength conversion component 30. In this embodiment, the measuring unit 95 is mounted at the end of the first surface 30a of the wavelength conversion component 30 on the -X side. The position of the measuring unit 95 mounted on the wavelength conversion component 30 is not limited to this embodiment. Alternatively, the measuring unit 95 may not be mounted on the wavelength conversion component 30. In this case, the measuring unit 95 is preferably a temperature sensor, such as a radiation temperature sensor, capable of measuring the temperature Tg of the wavelength conversion component 30 without contact with the wavelength conversion component 30. Furthermore, the light source device 21 may have multiple measuring units 95. In this case, the temperature Tg of the wavelength conversion component 30 can be either the maximum temperature measured by each measuring unit 95 or the average temperature measured by each measuring unit 95. Furthermore, each measuring unit 95 is preferably arranged along its long side (X-axis direction).

[0102] In this embodiment, the control unit 90 is connected to the measuring unit 95 and the temperature adjustment unit 70, respectively. 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 executes the control of the operation of the temperature adjustment unit 70 is installed in the control unit 90. At least a portion of the functions of each component of the control unit 90 are implemented, for example, by a processor such as a CPU (Central Processing Unit) executing the control program, i.e., software, stored in a memory unit (not shown). The control unit 90 has a storage unit 91.

[0103] The storage unit 91 stores a conversion table Tb1, which determines the relationship between the temperature Tg of the wavelength conversion component 30 measured by the measuring unit 95 and the pressing pressure Fp. The storage unit 91 can use recording media such as ROM (Read Only Memory) and flash memory.

[0104] Figure 7 This is a flowchart illustrating the temperature control of this embodiment. In the temperature control of this embodiment, the temperature Tg of the wavelength conversion component 30 is maintained between a first temperature T1 and a second temperature T2. In this embodiment, the second temperature T2 is a temperature higher than the first temperature T1.

[0105] First, the control unit 90 sets a first temperature T1 and a second temperature T2 (S10). The first temperature T1 and the second temperature T2 can be predetermined temperatures or temperatures appropriately determined based on environmental conditions such as the temperature of the environment where the projector 1 is installed and the internal temperature of the projector 1, which are then used to configure the light source device 21. Next, the control unit 90 obtains the temperature Tg of the wavelength conversion component 30, i.e., the characteristic value Vc, measured by the measurement unit 95 (S11). If the temperature Tg of the wavelength conversion component 30 is lower than the first temperature T1 (S12), the control unit 90 sets the pressing pressure Fp to a new pressing pressure Fp (Tg) based on the conversion table Tb1 and the temperature Tg of the wavelength conversion component 30 (S13). This allows the set pressing pressure Fp to be reduced. Then, the control unit 90 adjusts the pressing pressure Fp to the newly set pressing pressure Fp via the temperature adjustment unit 70. As a result, the contact area between the second surface 30b of the wavelength conversion component 30 and the support surface 43 of the support component 41 is reduced, thus reducing the heat transferred from the wavelength conversion component 30 to the support component 41. Therefore, it is possible to prevent the temperature of the wavelength conversion component 30 from becoming too low.

[0106] When the temperature Tg of the wavelength conversion component 30 is above the first temperature T1 and above the second temperature T2 (S12, S14), the control unit 90 sets the pressing pressure Fp to a new pressing pressure Fp(Tg) based on the conversion table Tb1 and the temperature Tg of the wavelength conversion component 30 (S15). This increases the set pressing pressure Fp. Next, the control unit 90 adjusts the pressing pressure Fp to the newly set pressing pressure Fp via the temperature adjustment unit 70. That is, when the temperature Tg of the wavelength conversion component 30 becomes higher than the predetermined temperature T2, the control unit 90 increases the pressing pressure Fp via the temperature adjustment unit 70. This increases the contact area between the second surface 30b of the wavelength conversion component 30 and the support surface 43 of the support member 41, thereby increasing the heat transferred from the wavelength conversion component 30 to the support member 41. Therefore, it is possible to prevent the temperature of the wavelength conversion component 30 from becoming too high.

[0107] When the temperature Tg of the wavelength conversion component 30 is above the first temperature T1 and below the second temperature T2 (S12, S14), the control unit 90 does not reset the pressing pressure Fp and does not adjust the pressing pressure Fp based on the temperature adjustment unit 70. Based on the 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 component 30, that is, the characteristic value Vc related to the temperature of the wavelength conversion component 30. Therefore, in the temperature control of this embodiment, it is possible to suppress the temperature Tg of the wavelength conversion component 30 from becoming too low or too high.

[0108] 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 (light); a wavelength conversion member 30 (light guide member) that receives the first light L1 emitted from the light-emitting element 36 and emits a second light L2 (light); a support member 41 that supports the wavelength conversion member 30; a pressing member 60 that presses the wavelength conversion member 30 against the support member 41; a measuring unit 95 that measures a characteristic value Vc related to the temperature Tg of the wavelength conversion member 30; a control unit 90 that acquires the characteristic value Vc measured by the measuring unit 95; and a temperature adjustment unit 70 that adjusts the temperature Tg of the wavelength conversion member 30, and the control unit 90 controls the temperature adjustment unit 70 based on the characteristic value Vc. Therefore, when the light source device 21 is operating, it is possible to suppress the temperature Tg of the wavelength conversion member 30 from becoming too high, as described above. This suppresses the increase in temperature extinction of the second light L2 in the wavelength conversion member 30, and thus suppresses the decrease in the wavelength conversion efficiency of the wavelength conversion member 30. Furthermore, by suppressing the temperature Tg of the wavelength conversion component 30 from becoming excessively high, the color gamut reduction of the second light L2 emitted by the wavelength conversion component 30 can be suppressed. Therefore, the image quality degradation projected by the projector 1 can be suppressed. Moreover, since thermal degradation of the wavelength conversion component 30 can be suppressed, the durability of the wavelength conversion component 30 can be improved.

[0109] According to this embodiment, the characteristic value Vc is the temperature Tg of the wavelength conversion component 30, and the temperature adjustment unit 70 adjusts the pressing force Fp by the pressing unit 60 pressing the wavelength conversion component 30 against the support member 41. Therefore, while the light source device 21 is operating, the contact area between the second surface 30b of the wavelength conversion component 30 and the support surface 43 of the support member 41 can be adjusted. This allows for adjustment of the heat transferred from the wavelength conversion component 30 to the support member 41. Therefore, based on the temperature Tg of the wavelength conversion component 30, the amount of heat dissipated from the wavelength conversion component 30 to the outside of the light source device 21 via the support member 41 can be adjusted, thus preventing the temperature of the wavelength conversion component 30 from becoming too high. Therefore, the reduction in the wavelength conversion efficiency of the wavelength conversion component 30 can be suppressed, and the reduction in the image quality projected by the projector 1 can be suppressed.

[0110] 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 reduces the pressing pressure Fp via the temperature adjustment unit 70. As such, 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 reduced. Therefore, it is possible to prevent the area of ​​the air layer between the wavelength conversion member 30 and the support surface 43 from becoming too small. Therefore, it is possible to reduce the amount of second light L2 propagating inside the wavelength conversion member 30 and incident on the second surface 30b, which is then emitted from the second surface 30b to the outside of the wavelength conversion member 30 and absorbed by the support surface 43. Therefore, the wavelength conversion efficiency of the wavelength conversion member 30 can be improved more appropriately.

[0111] According to this embodiment, when the temperature of the wavelength conversion component 30 becomes higher than a predetermined temperature T2, the control unit 90 increases the pressing pressure Fp via the temperature adjustment unit 70. Therefore, as described above, when the temperature of the wavelength conversion component 30 becomes higher than the predetermined temperature T2, the contact area between the second surface 30b and the support surface 43 can be increased. Therefore, the heat transferred from the wavelength conversion component 30 to the support member 41 can be increased. Therefore, the amount of heat dissipated from the wavelength conversion component 30 to the outside of the light source device 21 via the support member 41 can be increased, thus preventing the temperature of the wavelength conversion component 30 from becoming too high.

[0112] According to this embodiment, the light-emitting element 36 emits a first light L1 having a first wavelength band, and the light guiding component is a wavelength conversion component 30, which includes a phosphor 33. This component converts the first light L1 into a second light L2 having a second wavelength band different from the first wavelength band, and then emits the second light L2. As described above, in this embodiment, it is possible to suppress the temperature Tg of the wavelength conversion component 30 from becoming too high. Therefore, it is possible to suppress the reduction in wavelength conversion efficiency of the wavelength conversion component 30 and to suppress the reduction in image quality projected by the projector 1.

[0113] 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 in the wavelength conversion member 30 can be improved, thus increasing the amount of the second light L2 emitted from the wavelength conversion member 30. This reduces the amount of the first light L1 required to emit a predetermined amount of the second light L2. Consequently, the amount of the first light L1 emitted by the light-emitting element 36 can be reduced, thereby suppressing the power consumption of the projector 1.

[0114] Example 1

[0115] Hereinafter, the projector 101 of the first modified example of the first embodiment will be described.

[0116] The basic structure of the projector 101 in this modified example is the same as that of the projector 1 in the first embodiment. The projector 101 in this modified example includes a pressing part 160 and a temperature adjustment part 170. In the following description, structural elements that are the same as those in the projector 1 of the first embodiment are labeled with the same reference numerals, and their descriptions are omitted.

[0117] Figure 8 This is a cross-sectional view of the light source device 121 in this modified example. The light source device 121 includes a pressing part 160 and a temperature adjustment part 170. The pressing part 160 presses the wavelength conversion member 30 against the support member 41. In this modified example, the pressing part 160 has a pressing member 161 and an elastic member 162.

[0118] The pressing member 161 presses the wavelength conversion member 30 against the support member 41. The pressing member 161 is a leaf spring extending along the Z-axis direction. The pressing member 161 is elastic. One end 161a of the pressing member 161 is opposite to the first inner surface 49b in the incident direction (Y-axis direction). An elastic member 162 capable of elastic deformation in the incident direction is disposed between the end 161a and the first inner surface 49b. The elastic member 162 contacts the end 161a and the first inner surface 49b. The elastic member 162 applies an elastic force toward the -Y side to the end 161a.

[0119] The other end 161c of the pressing member 161 is opposed to 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. The elastic member 162 applies an elastic force toward the -Y side to the other end 161c.

[0120] The central portion of the pressing member 161 presses against the first surface 30a of the wavelength conversion member 30 from the -Y side. The closer one end 161a and the other end 161c of the pressing member 161 are to the +Y side, the greater the pressing force Fp becomes. The closer one end 161a and the other end 161c are to the -Y side, the smaller the pressing force Fp becomes. In this modified example, the positions of one end 161a and the other end 161c of the pressing member in the incident direction can be adjusted using the temperature adjustment unit 170.

[0121] In this modified example, the temperature adjustment unit 170 adjusts the pressure applied to one end 161a and the other end 161c towards the +Y direction. In this modified example, the temperature adjustment unit 170 has two cylinders 171. One cylinder 171 adjusts the pressure applied to one end 161a towards the +Y direction. This allows adjustment of the position of the incident direction (+Y axis direction) of one end 161a. The other cylinder 171 adjusts the pressure applied to the other end 161c towards the +Y direction. This allows adjustment of the position of the incident direction of the other end 161c.

[0122] The greater the pressure applied to one end 161a and the other end 161c, the more the ends 161a and 161c are located on the +Y side, thus increasing the pressing force Fp. A greater pressing force Fp results in greater heat transfer from the wavelength conversion member 30 to the support member 41, thereby lowering the temperature of the wavelength conversion member 30. Conversely, the smaller the pressure applied to one end 161a and the other end 161c, the more the ends 161a and 161c are located on the -Y side, thus decreasing the pressing force Fp. A smaller pressing force Fp reduces the heat transfer from the wavelength conversion member 30 to the support member 41, thereby increasing the temperature of the wavelength conversion member 30. Therefore, the temperature adjustment unit 170 adjusts the temperature of the wavelength conversion member 30 by adjusting the pressing force Fp applied by the pressing unit 160 to the support member 41. The other structures of the light source device 121 in this modified example are the same as those of the light source device 21 in the first embodiment described above.

[0123] The temperature control in this variation is the same as that in the first embodiment described above. 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. Then, the control unit 90 adjusts the pressing force Fp to the newly set pressing force Fp via 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, thus 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. Then, the control unit 90 adjusts the pressing force Fp to the newly set pressing force Fp via 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, thus preventing the temperature of the wavelength conversion member 30 from becoming too high. Therefore, in the temperature control of this modified example, it is possible to suppress the temperature Tg of the wavelength conversion component 30 from becoming too low and the temperature Tg of the wavelength conversion component 30 from becoming too high.

[0124] According to this modified example, the control unit 90 controls the temperature adjustment unit 170 based on the temperature Tg, i.e., the characteristic value Vc, of the wavelength conversion component 30. Therefore, while the light source device 121 is operating, it is possible to suppress the temperature Tg of the wavelength conversion component 30 from becoming too high, as described above. Therefore, as described above, it is possible to suppress the reduction in the wavelength conversion efficiency of the wavelength conversion component 30 and to suppress the reduction in the image quality projected by the projector 101.

[0125] Second variation

[0126] Hereinafter, the projector 201 of the second modification of the first embodiment will be described.

[0127] The basic structure of the projector 201 in this modified example is the same as that of the projector 1 in the first embodiment. The projector 201 in this modified example includes a pressing part 260 and a temperature adjustment part 270. In the following description, structural elements that are the same as those in the projector 1 of the first embodiment are labeled with the same reference numerals, and their descriptions are omitted.

[0128] Figure 9 This is a cross-sectional view of the light source device 221 in this modified example. The light source device 221 includes a pressing part 260 and a temperature adjustment part 270. The pressing part 260 presses the wavelength conversion member 30 against the support member 41. In this modified example, the pressing part 260 includes a pressing member 261 and screws 263a and 263c.

[0129] The pressing member 261 presses the wavelength conversion member 30 against the support member 41. The pressing member 261 is a leaf spring extending along the Z-axis. The pressing member 261 is elastic. 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 of the pressing member 260 on the wavelength conversion member 30 can be adjusted by the temperature adjustment unit 270.

[0130] In this modified example, the temperature adjustment unit 270 adjusts the pressure applied to the center portion of the pressing member 261 towards the +Y side. In this modified example, the temperature adjustment unit 270 includes a cylinder 271. The cylinder 271 adjusts the pressure applied to the center portion of the pressing member 261 towards the +Y side. Therefore, the temperature adjustment unit 270 can adjust the pressing force Fp of the pressing member 260 pressing the wavelength conversion member 30.

[0131] The greater the pressure applied by the temperature adjustment unit 270 to the center of the pressing member 261, the greater the pressing force Fp becomes. A greater pressing force Fp results in a greater amount of heat transferred from the wavelength conversion member 30 to the support member 41, thus lowering the temperature of the wavelength conversion member 30. Conversely, the smaller the pressure applied by the temperature adjustment unit 270 to the center of the pressing member 261, the smaller the pressing force Fp becomes. A smaller pressing force Fp results in a less amount of heat transferred from the wavelength conversion member 30 to the support member 41, thus raising the temperature of the wavelength conversion member 30. 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 member 260 to the support member 41. Other structures of the light source device 221 in this modified example are the same as those in the first embodiment described above. Furthermore, the temperature control in this modified example is the same as that in the first embodiment described above.

[0132] According to this modified example, the control unit 90 controls the temperature adjustment unit 270 based on the temperature Tg, i.e., the characteristic value Vc, of the wavelength conversion component 30. Therefore, while the light source device 221 is operating, it is possible to suppress the temperature Tg of the wavelength conversion component 30 from becoming too high, as described above. Therefore, as described above, it is possible to suppress the reduction in wavelength conversion efficiency of the wavelength conversion component 30 and to suppress the reduction in image quality projected by the projector 201.

[0133] Implementation Method 2

[0134] The projector 301 of the second embodiment will be described below.

[0135] The basic structure of the projector 301 in this embodiment is the same as that of the projector 1 in the first embodiment. The projector 301 in this embodiment includes a measuring unit 395 and a reflector 396. In the following description, structural elements that are the same as those in the projector 1 of the first embodiment are labeled with the same reference numerals, and their descriptions are omitted.

[0136] Figure 10 This is a schematic structural diagram of the first lighting device 320 of this embodiment. As described above, the light source device 321 of this embodiment includes a measuring unit 395 and a reflector 396. Figure 10As shown, in this embodiment, the reflector 396 is disposed between the angle conversion member 38 and the first lens array 52. ​​More specifically, the reflector 396 is disposed between the outer edge of the angle conversion member 38 and the outer edge of the first lens array 52. ​​The reflector 396 reflects a portion of the second light L2 emitted from the emission surface 38b of the angle conversion member 38 toward the measuring unit 395. Thus, a portion of the second light L2 is incident on the measuring unit 395. Furthermore, the location of the reflector 396 is not particularly limited; for example, the reflector 396 can be disposed between the first lens array 52 and the second lens array 53, or it can be disposed at a position closer to the emission side than the overlapping optical system 56.

[0137] In this embodiment, the measuring unit 395 is a known spectrophotometer capable of measuring the chromaticity of light. In this embodiment, the measuring 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 in the second light L2 in the wavelength range of 490 nm to 600 nm decreases, and the wavelength spectrum shifts towards the longer wavelength side. That is, when the temperature Tg of the wavelength conversion member 30 becomes too high, the chromaticity Cr of the second light L2 shifts towards the longer wavelength side. In other words, the chromaticity Cr of the second light L2 is related to the temperature Tg of the wavelength conversion member 30. In this embodiment, the characteristic value Vc related to 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 guide member. Furthermore, although the figures are omitted, the structures of the pressing part 60 and the temperature adjustment part 70 in this embodiment are the same as those in the first embodiment described above. Therefore, the temperature adjustment unit 70 adjusts the pressing force Fp by which the pressing unit 60 presses the wavelength conversion member 30 against the support member 41. Other structures of the light source device 321 in this embodiment are the same as those of the light source device 21 in the first embodiment described above.

[0138] In this embodiment, the control unit 90 is connected to the measurement unit 395 and the temperature adjustment unit 70, respectively. The storage unit 91 stores a conversion table Tb2, which determines the relationship between the chromaticity Cr of the second light L2 measured by the measurement unit 395 and the pressing pressure Fp.

[0139] Figure 11 This is a flowchart illustrating the temperature control in 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.

[0140] First, the control unit 90 sets the chromaticity range Rc (S210). The chromaticity range Rc can be a predetermined chromaticity range Rc, or it can be an appropriately determined chromaticity range Rc based on the environmental conditions of the environment where the projector 1 is installed, such as the temperature of the environment and the internal temperature of the projector 1, which are used to configure the light source device 21. Next, the control unit 90 obtains the chromaticity Cr, i.e., the characteristic value Vc, of the second light L2 measured by the measurement unit 395 (S211). If the chromaticity Cr of the second light L2 is outside the range of chromaticity range Rc, in this embodiment, when the chromaticity Cr of the second light L2 is more biased towards the longer wavelength side than the chromaticity range Rc (S212), the control unit 90 sets the pressing pressure Fp to a new pressing pressure Fp (Tg) based on the conversion table Tb2 and the chromaticity Cr of the second light L2 (S213). This allows the set pressing pressure Fp to be increased. Next, the control unit 90 adjusts the pressing pressure Fp to the newly set pressing pressure Fp via the temperature adjustment unit 70. In other words, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion component 30 is more biased towards the longer wavelength side than the predetermined chromaticity range Rc, the control unit 90 increases the pressing pressure Fp through the temperature adjustment unit 70. This increases the contact area between the second surface 30b of the wavelength conversion component 30 and the support surface 43 of the support member 41, thereby increasing the heat transfer from the wavelength conversion component 30 to the support member 41. Therefore, it is possible to prevent the temperature of the wavelength conversion component 30 from becoming excessively high.

[0141] 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. The temperature adjustment unit 70 adjusts the pressing force Fp of the pressing unit 60 pressing the wavelength conversion member 30 against the support member 41. Therefore, while the light source device 321 is operating, the heat transferred from the wavelength conversion member 30 to the support member 41 can be adjusted. Thus, based on the characteristic value Vc, i.e., the chromaticity Cr of the second light L2, which is related to the temperature Tg of the wavelength conversion member 30, 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 adjusted, thereby suppressing the temperature of the wavelength conversion member 30 from becoming too high. Therefore, the reduction in the wavelength conversion efficiency of the wavelength conversion member 30 can be suppressed, and the reduction in the image quality projected by the projector 301 can be suppressed.

[0142] According to this embodiment, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30 is more biased towards the longer wavelength side than the predetermined chromaticity range Rc, the control unit 90 increases the pressing pressure Fp through the temperature adjustment unit 70. Therefore, as described above, when the temperature Tg of the wavelength conversion member 30 becomes high, the temperature adjustment unit 70 can increase the 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, thus preventing the temperature of the wavelength conversion member 30 from becoming too high.

[0143] Third implementation method

[0144] The projector 401 of the third embodiment will be described below.

[0145] The basic structure of the projector 401 in this embodiment is the same as that of the projector 1 in the first embodiment. The projector 401 in this embodiment includes a heat dissipation unit 447 and a temperature adjustment unit 470. In the following description, structural elements that are the same as those in the projector 1 of the first embodiment are labeled with the same reference numerals, and their descriptions are omitted.

[0146] Figure 12 This is a schematic structural diagram of the first lighting device 420 according to this embodiment. As described above, the light source device 421 of this embodiment includes a heat dissipation unit 447 and a temperature adjustment unit 470. Figure 12 As shown, the heat dissipation part 447 is a heat sink fixed to the surface of the support member 41 facing the +Y side. The heat dissipation part 447 is made of metal. In this embodiment, the heat dissipation part 447 is made of aluminum. The thermal conductivity of the heat dissipation part 447 is preferably greater than that of the support member 41. The heat dissipation part 447 has a plurality of heat sink fins 447a.

[0147] Each heat sink 447a protrudes in the incident direction (Y-axis direction). Although not shown in the figure, each heat sink 447a is plate-shaped and extends along the Z-axis direction. The heat sinks 447a are spaced apart from each other along their long side direction (X-axis direction). Alternatively, each heat sink 447a may also be plate-shaped and extend along its long side direction. In this case, the heat sinks 447a are spaced apart from each other along the Z-axis direction. In this embodiment, the heat dissipation portion 447 has multiple heat sinks 447a, thus increasing the surface area of ​​the heat dissipation portion 447. This increases the amount of heat dissipated from the support member 41 to the outside of the light source device 421 via the heat dissipation portion 447. 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 portion 447 can be increased. Alternatively, the light source device 421 may not include the heat dissipation portion 447.

[0148] In this embodiment, the temperature adjustment unit 470 is an air supply unit 474 that supplies air to at least one of the support member 41 and the wavelength conversion member 30. That is, the light source device 421 includes an air supply unit 474. In this embodiment, the air supply unit 474 is a fan. In this embodiment, the temperature adjustment unit 470 supplies air to both the support member 41 and the heat dissipation unit 447. The temperature adjustment unit 470 may also supply air to the wavelength conversion member 30. In this embodiment, the temperature adjustment unit 470 adjusts the air volume Af supplied by the air supply unit 474 to both the support member 41 and the heat dissipation unit 447 by adjusting the rotational speed of the fan.

[0149] The greater the airflow Af supplied by the temperature adjustment unit 470 to the support member 41 and the heat dissipation unit 447, the greater the heat dissipation from the support member 41 and the heat dissipation unit 447 to the outside of the light source device 421. Therefore, the heat dissipation 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 results in a lower temperature for the wavelength conversion member 30. Conversely, the smaller the airflow Af supplied by the temperature adjustment unit 470 to the support member 41 and the heat dissipation unit 447, the less heat dissipation from the support member 41 and the heat dissipation unit 447 to the outside of the light source device 421. Therefore, the heat dissipation 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 results in a higher temperature for the wavelength conversion member 30. Therefore, the temperature adjustment unit 470 adjusts the temperature of the wavelength conversion unit 30 by adjusting the air volume Af delivered by the air supply unit 474 to the support member 41 and the heat dissipation unit 447 respectively.

[0150] The measuring unit 95 of this embodiment measures the temperature Tg of the wavelength conversion member 30 in the same way as the measuring unit 95 of the first embodiment. That is, in this embodiment, the characteristic value Vc related to the temperature Tg of the wavelength conversion member 30 is the temperature Tg of the wavelength conversion member 30. Other structures of the light source device 421 of this embodiment are the same as those of the light source device 21 of the first embodiment described above.

[0151] In this embodiment, the control unit 90 is connected to the measurement unit 95 and the temperature adjustment unit 470, respectively. The storage unit 91 stores a conversion table Tb3, which determines the relationship between the temperature Tg of the wavelength conversion component 30 measured by the measurement unit 95 and the air volume Af.

[0152] Figure 13 This is a flowchart illustrating the temperature control of this embodiment. In the temperature control of this embodiment, the temperature Tg of the wavelength conversion component 30 is maintained between the first temperature T1 and the second temperature T2.

[0153] First, the control unit 90 sets a first temperature T1 and a second temperature T2 (S310). Next, the control unit 90 obtains the temperature Tg of the wavelength conversion component 30, i.e., the characteristic value Vc, measured by the measurement unit 95 (S311). If the temperature Tg of the wavelength conversion component 30 is lower than the first temperature T1 (S312), the control unit 90 sets the airflow Af to a new airflow Af(Tg) based on the conversion table Tb3 and the temperature Tg of the wavelength conversion component 30 (S313). This allows the set airflow Af to be reduced. Next, the control unit 90 adjusts the airflow Af to the newly set airflow Af via the temperature adjustment unit 470. This reduces the amount of heat dissipated from the wavelength conversion component 30 to the outside of the light source device 421 via the support member 41 and the heat dissipation unit 447. Therefore, it is possible to prevent the temperature of the wavelength conversion component 30 from becoming too low.

[0154] When the temperature Tg of the wavelength conversion component 30 is above the first temperature T1 and above the second temperature T2 (S312, S314), the control unit 90 sets the airflow Af to a new airflow Af(Tg) based on the conversion table Tb3 and the temperature Tg of the wavelength conversion component 30 (S315). This increases the set airflow Af. Next, the control unit 90 adjusts the airflow Af to the newly set airflow Af via the temperature adjustment unit 470. In other words, when the temperature Tg of the wavelength conversion component 30 becomes higher than the predetermined temperature T2, the control unit 90 increases the airflow Af via the temperature adjustment unit 470. This increases the amount of heat dissipated from the wavelength conversion component 30 to the outside of the light source device 421 via the support member 41 and the heat dissipation unit 447. Therefore, it is possible to prevent the temperature of the wavelength conversion component 30 from becoming too high.

[0155] Furthermore, when increasing the air supply volume Af, such as Figure 14 As shown, the control unit 90 can also gradually reduce the air supply volume Af to a value greater than the set air supply volume Af(Tg) after setting it to a value greater than the set air supply volume Af(Tg). Thus, as... Figure 15 As shown, immediately after increasing the air supply volume Af, the temperature Tg of the wavelength conversion component 30 can be reduced in a good responsive manner.

[0156] like Figure 13As shown, when the temperature Tg of the wavelength conversion component 30 is above the first temperature T1 and below the second temperature T2 (S312, S314), the control unit 90 does not reset the air supply volume Af and does not adjust the air supply volume Af based on the temperature adjustment unit 470. Based on the 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 component 30, that is, the characteristic value Vc related to the temperature of the wavelength conversion component 30. Therefore, in the temperature control of this embodiment, it is possible to suppress the temperature Tg of the wavelength conversion component 30 from becoming too low or too high.

[0157] According to this embodiment, the light source device 421 includes an air supply section 474 that supplies air to at least one of the support member 41 and the wavelength conversion member 30, i.e., the light guide member. A characteristic value Vc is the temperature Tg of the wavelength conversion member 30. The temperature adjustment section 470 adjusts the air supply volume Af supplied by the air supply section 474 to at least one of the support member 41 and the wavelength conversion member 30. Therefore, in this embodiment, when the light source device 421 is operating, as described above, the amount of heat dissipated from the support member 41 to the outside of the light source device 421 can be adjusted. Thus, based on the temperature Tg of the wavelength conversion member 30, 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 can be adjusted, thereby suppressing the temperature of the wavelength conversion member 30 from becoming too high. Therefore, the reduction in the wavelength conversion efficiency of the wavelength conversion member 30 can be suppressed, and the reduction in the image quality projected by the projector 401 can be suppressed.

[0158] According to this embodiment, when the temperature Tg of the wavelength conversion component 30 becomes higher than the predetermined temperature T2, the control unit 90 increases the air supply volume Af through 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 component 30 to the outside of the light source device 421 via the support member 41, thereby preventing the temperature of the wavelength conversion component 30 from becoming too high.

[0159] Furthermore, in this embodiment, the light source device 421 includes the aforementioned heat dissipation section 447, and the temperature adjustment section 470 supplies air to the support member 41 and the heat dissipation section 447, respectively. Therefore, as described above, the amount of heat dissipated from the wavelength conversion member 30 to the outside of the light source device 421 can be increased, thus more appropriately suppressing the temperature of the wavelength conversion member 30 from becoming too high.

[0160] Implementation Method 4

[0161] The projector 501 of the fourth embodiment will be described below.

[0162] The basic structure of the projector 501 in this embodiment is the same as that of the projector 401 in the fourth embodiment. The projector 501 in this embodiment includes a measuring unit 395 and a reflector 396. In the following description, structural elements that are the same as those in the projector 401 of the fourth embodiment are labeled with the same reference numerals, and their descriptions are omitted.

[0163] Figure 16 This is a schematic structural diagram of the first lighting device 520 of this embodiment. As described above, the light source device 521 of this embodiment includes a measuring unit 395 and a reflector 396. The structures of the measuring unit 395 and the reflector 396 in this embodiment are the same as those in the second embodiment described above. That is, the reflector 396 reflects a portion of the second light L2 emitted from the emission surface 38b of the angle conversion member 38 to the measuring unit 395. The measuring 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 related to 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 guide member. Furthermore, the temperature adjustment unit 470 of this embodiment is the same as the temperature adjustment unit 470 of the third embodiment described above. Therefore, the temperature adjustment unit 470 adjusts the air volume Af supplied by the air supply unit 474 to at least one of the support member 41 and the wavelength conversion member 30. In addition, the light source device 421 includes an air supply section 474 that supplies air to at least one of the support member 41 and the wavelength conversion member 30. Other structures of the light source device 521 in this embodiment are the same as those of the light source device 21 in the first embodiment described above.

[0164] In this embodiment, the control unit 90 is connected to the measurement unit 395 and the temperature adjustment unit 470, respectively. The storage unit 91 stores a conversion table Tb4, which determines the relationship between the chromaticity Cr of the second light L2 measured by the measurement unit 395 and the air volume Af.

[0165] Figure 17 This is a flowchart illustrating the temperature control in 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.

[0166] First, the control unit 90 sets the chromaticity range Rc (S410). Next, the control unit 90 obtains the chromaticity Cr, i.e., the characteristic value Vc, of the second light L2 measured by the measurement unit 395 (S411). If the chromaticity Cr of the second light L2 is outside the chromaticity range Rc, in this embodiment, when the chromaticity Cr of the second light L2 is more biased towards the longer wavelength side than the chromaticity range Rc (S412), the control unit 90 sets the airflow Af to a new airflow Af (Tg) based on the conversion table Tb4 and the chromaticity Cr of the second light L2 (S413). This allows the set airflow Af to be increased. Next, the control unit 90 adjusts the airflow Af to the newly set airflow Af via the temperature adjustment unit 470. In other words, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion component 30 is more biased towards the longer wavelength side than the predetermined chromaticity range Rc, the control unit 90 increases the air supply volume Af through the temperature adjustment unit 470. As a result, the amount of heat dissipated from the support member 41 and the heat dissipation unit 447 increases. Therefore, it is possible to prevent the temperature of the wavelength conversion component 30 from becoming too high.

[0167] According to this embodiment, the light source device 521 includes an air supply section 474 that supplies 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 section 470 adjusts the air supply volume Af supplied by the air supply section 474 to at least one of the support member 41 and the wavelength conversion member 30. Therefore, when 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, based on the characteristic value Vc, which is related to the temperature Tg of the wavelength conversion member 30 and the chromaticity Cr of the second light L2, 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, thus suppressing the temperature of the wavelength conversion member 30 from becoming too high. Therefore, the reduction in the wavelength conversion efficiency of the wavelength conversion member 30 can be suppressed, and the reduction in the image quality projected by the projector 501 can be suppressed.

[0168] According to this embodiment, when the chromaticity Cr of the second light L2 emitted by the wavelength conversion member 30 is more biased towards the longer wavelength side than the predetermined chromaticity range Rc, the control unit 90 increases the air supply volume Af through 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.

[0169] The embodiments of the present invention have been described above, but the technical scope of the present invention is not limited to the above 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 structure obtained by appropriately combining the feature portions of the above embodiments.

[0170] In the above embodiments, an example of applying the present invention to a light source device equipped with a wavelength conversion component was given. However, instead of this structure, the present invention can also be applied to a light source device in which wavelength conversion is not performed, and the incident light is emitted after propagation, for example, by controlling the angular distribution. In this case, the wavelength conversion component of the above embodiments replaces the light guide component, and the light emitted from the light-emitting element is emitted towards the angle conversion component as light of the original wavelength band.

[0171] The specific descriptions of the shape, quantity, configuration, materials, etc., of the various structural elements of the light source device and projector are not limited to the above embodiments and can be appropriately modified. Furthermore, the above embodiments show an example of mounting the light source device of the present invention on a projector using a liquid crystal panel, but this is not a limitation. The light source device of the present invention can also be applied to a projector using a digital micromirror device as a light modulation device. Additionally, the projector may not have multiple light modulation devices, or it may have only one light modulation device.

[0172] The above embodiments illustrate an example of applying the light source device of the present invention to a projector, but are not limited thereto. The light source device of the present invention can also be applied to lighting fixtures, automotive headlights, etc.

[0173] This is a summary of the disclosure.

[0174] The following is a summary published in this note.

[0175] Postscript 1

[0176] A light source device includes: a light source unit having a light-emitting element that emits light; a light guide member that receives and emits light from the light-emitting element; a support member that supports the light guide member; a pressing member that presses the light guide member against the support member; a measuring unit that measures a characteristic value related to the temperature of the light guide member; a control unit that acquires the characteristic value measured by the measuring unit; and a temperature adjustment unit that adjusts the temperature of the light guide member, wherein the control unit controls the temperature adjustment unit based on the characteristic value.

[0177] According to this light source device structure, when the light source device is in operation, the temperature of the wavelength conversion component can be suppressed from becoming too high. This suppresses the increase in temperature extinction of the second light in the wavelength conversion component, thus preventing a decrease in the wavelength conversion efficiency of the wavelength conversion component. Furthermore, it suppresses a decrease in the color gamut of the second light emitted from the wavelength conversion component. Therefore, it suppresses a decrease in the image quality projected by the projector.

[0178] Appendix 2

[0179] According to the light source device described in Appendix 1, the characteristic value is the temperature of the light guide component, and the temperature adjustment unit adjusts the pressing force of the pressing unit pressing the light guide component against the support component.

[0180] According to this structure, the contact area between the second surface of the wavelength conversion component and the support surface of the support component can be adjusted, thereby adjusting the heat transferred from the wavelength conversion component to the support component. Therefore, based on the temperature of the wavelength conversion component, the amount of heat dissipated from the wavelength conversion component to the outside of the light source device via the support component can be adjusted, thus preventing the temperature of the wavelength conversion component from becoming too high. Therefore, it is possible to suppress the reduction in the wavelength conversion efficiency of the wavelength conversion component and to suppress the reduction in the image quality projected by the projector.

[0181] Appendix 3

[0182] According to the light source device described in Appendix 2, when the temperature of the light guide component becomes higher than a predetermined temperature, the control unit increases the pressing pressure through the temperature adjustment unit.

[0183] According to this structure, when the temperature of the wavelength conversion component becomes higher than a predetermined temperature, the contact area between the second surface and the support surface can be increased. Therefore, the amount of heat dissipated from the wavelength conversion component to the outside of the light source device via the support component can be increased, thus preventing the temperature of the wavelength conversion component from becoming too high.

[0184] Appendix 4

[0185] According to the light source device described in Appendix 1, the light source device includes an air supply section that supplies air to at least one of the support member and the light guide member, the characteristic value being the temperature of the light guide member, and the temperature adjustment section adjusting the air supply volume supplied by the air supply section to at least one of the support member and the light guide member.

[0186] According to this structure, while the light source device is in operation, the amount of heat dissipated from the support member to the outside of the light source device can be adjusted. Therefore, based on the temperature of the wavelength conversion member, 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, thus preventing the temperature of the wavelength conversion member from becoming too high. Consequently, it is possible to suppress the reduction in the wavelength conversion efficiency of the wavelength conversion member and to suppress the degradation of the image quality projected by the projector.

[0187] Appendix 5

[0188] According to the light source device described in Appendix 4, when the temperature of the light guide component becomes higher than a predetermined temperature, the control unit increases the air supply volume through the temperature adjustment unit.

[0189] According to this structure, when the temperature of the wavelength conversion component becomes higher than a predetermined temperature, the heat dissipation from the wavelength conversion component to the outside of the light source device via the support component can be increased by the temperature adjustment unit, thus preventing the temperature of the wavelength conversion component from becoming too high.

[0190] Appendix 6

[0191] According to the light source device described in Appendix 1, the characteristic value is the chromaticity of the light emitted by the light guide component.

[0192] The temperature adjustment unit adjusts the pressing force by which the pressing unit presses the light guide component against the support component.

[0193] According to this structure, the amount of heat dissipated from the wavelength conversion component to the outside of the light source device via the support component can be adjusted based on the chromaticity of the second light, a characteristic value related to the temperature of the wavelength conversion component. Therefore, it is possible to suppress the temperature of the wavelength conversion component from becoming too high. Consequently, it is possible to suppress the reduction in the wavelength conversion efficiency of the wavelength conversion component and to suppress the reduction in the image quality projected by the projector.

[0194] Postscript 7

[0195] According to the light source device described in Appendix 6, when the chromaticity of the light emitted by the light guide component is more biased towards the longer wavelength side than a predetermined chromaticity range, the control unit increases the pressing pressure through the temperature adjustment unit.

[0196] According to this structure, when the temperature of the wavelength conversion component increases, the heat transferred from the wavelength conversion component to the support component can be increased by the temperature adjustment unit. Therefore, the amount of heat dissipated from the wavelength conversion component to the outside of the light source device via the support component can be increased, thus preventing the temperature of the wavelength conversion component from becoming too high.

[0197] Postscript 8

[0198] According to the light source device described in Appendix 1, the light source device includes an air supply section that supplies air to at least one of the support member and the light guide member, the characteristic value being the chromaticity of the light emitted by the light guide member, and the temperature adjustment section adjusting the air supply volume supplied by the air supply section to at least one of the support member and the light guide member.

[0199] According to this structure, while the light source device is in operation, the amount of heat dissipated from the wavelength conversion component to the outside of the light source device via the support member can be adjusted. Therefore, based on the chromaticity of the second light, the amount of heat dissipated from the wavelength conversion component to the outside of the light source device via the support member can be adjusted, thus suppressing the temperature of the wavelength conversion component from becoming too high. Therefore, the reduction in the wavelength conversion efficiency of the wavelength conversion component can be suppressed, and the reduction in the image quality projected by the projector can be suppressed.

[0200] Postscript 9

[0201] According to the light source device described in Appendix 8, when the chromaticity of the light emitted by the light guide component is more biased towards the longer wavelength side than a predetermined chromaticity range, the control unit increases the air supply volume through the temperature adjustment unit.

[0202] According to this structure, when the temperature of the wavelength conversion component becomes too high, the heat dissipation from the wavelength conversion component to the outside of the light source device via the support component can be increased by the temperature adjustment unit. Therefore, it is possible to prevent the temperature of the wavelength conversion component from becoming too high.

[0203] Postscript 10

[0204] The light source device according to any one of Appendix 1 to Appendix 9, wherein the light-emitting element emits a first light having a first wavelength band, the light guide component is a wavelength conversion component comprising a phosphor, converts the first light into a second light having a second wavelength band different from the first wavelength band, and emits the second light.

[0205] According to this structure, the temperature of the wavelength conversion component can be suppressed from becoming too high. Therefore, the reduction in the wavelength conversion efficiency of the wavelength conversion component can be suppressed, and the reduction in the image quality projected by the projector can be suppressed.

[0206] Postscript 11

[0207] A projector comprising: a light source device as described in any one of Annexes 1 to 10; a light modulation device for modulating light emitted from the light source device; and a projection optics device for projecting light modulated by the light modulation device.

[0208] According to this projector structure, the wavelength conversion efficiency in the wavelength conversion component can be improved, thereby increasing the amount of light emitted from the second light source. This reduces the amount of light required for the first light source to emit the second light source of a specified quantity. Consequently, the amount of light emitted from the first light source by the light-emitting element can be reduced, thus suppressing the power consumption of the projector.

Claims

1. A light source device comprising: The light source section has a light-emitting element that emits light; A light guide component that receives light emitted from the light-emitting element and emits light; Support component, which supports the light guide component; The pressing part presses the light guide component against the supporting component; The measuring unit measures characteristic values ​​related to the temperature of the light guide component; The control unit acquires the characteristic value measured by the measurement unit; and The temperature adjustment unit adjusts the temperature of the light guide component. The control unit controls the temperature adjustment unit based on the characteristic value.

2. The light source device according to claim 1, wherein, The characteristic value is the temperature of the light guide component. The temperature adjustment unit adjusts the pressing force by which the pressing unit presses the light guide component against the support component.

3. The light source device according to claim 2, wherein, When the temperature of the light guide component becomes higher than a predetermined temperature, the control unit increases the pressing pressure through the temperature adjustment unit.

4. The light source device according to claim 1, wherein, The light source device includes an air supply section that supplies air to at least one of the support member and the light guide member. The characteristic value is the temperature of the light guide component. The temperature adjustment unit adjusts the air volume delivered by the air supply unit to at least one of the support member and the light guide member.

5. The light source device according to claim 4, wherein, When the temperature of the light guide component becomes higher than a predetermined temperature, the control unit increases the air volume through the temperature adjustment unit.

6. The light source device according to claim 1, wherein, The characteristic value is the chromaticity of the light emitted by the light guide component. The temperature adjustment unit adjusts the pressing force by which the pressing unit presses the light guide component against the support component.

7. The light source device according to claim 6, wherein, When the chromaticity of the light emitted by the light guide component is more biased towards the longer wavelength side than the predetermined chromaticity range, the control unit increases the pressing pressure through the temperature adjustment unit.

8. The light source device according to claim 1, wherein, The light source device includes an air supply section that supplies 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 guide component. The temperature adjustment unit adjusts the air volume delivered by the air supply unit to at least one of the support member and the light guide member.

9. The light source device according to claim 8, wherein, When the chromaticity of the light emitted by the light guide component is more biased towards the longer wavelength side than the predetermined chromaticity range, the control unit increases the air supply volume through the temperature adjustment unit.

10. The light source device according to any one of claims 1 to 9, wherein, The light-emitting element emits a first light with a first wavelength. The light guide component is a wavelength conversion component, which includes a phosphor to convert the first light into a second light having a second wavelength band different from the first band, and emits the second light.

11. A projector comprising: The light source device according to any one of claims 1 to 9; An optical modulation device that modulates light emitted from the light source device; and A projection optical device that projects light modulated by the light modulation device.

Images