Light source device and projection display device

Abstract

A light source device according to an embodiment of the present disclosure includes: a support substrate including a phosphor layer on one surface; a driving unit configured to rotationally drive the support substrate; a first support member opposing another surface of the support substrate opposite to the one surface; a plurality of first heat dissipation members each having different heat dissipation performance according to a distance from the phosphor layer, the plurality of first heat dissipation members being concentrically disposed on the another surface of the support substrate; and a plurality of second heat dissipation members concentrically disposed on a surface of the first support member opposing the support substrate, the plurality of second heat dissipation members being alternately disposed with the plurality of first heat dissipation members.

Description

Technical Field

[0001] The present disclosure relates to: a light source device including a spinner as a wavelength converter, the spinner including a phosphor layer as a light-emitting unit; and a projection display device including the light source device. Background Art

[0002] In recent years, a laser-phosphor system light source device has been used as a light source of a projector. In the laser-phosphor system light source device, in order to prevent output deterioration or breakage due to dust, a method of accommodating a wheel fixed with a phosphor in a sealed housing has been adopted. In such a light source device, for example, a light source device is disclosed in which a plurality of concentric heat dissipation members provided on a sealed housing and a plurality of concentric heat dissipation members provided on the wheel side are combined (for example, see Patent Document 1). In such a light source device, by utilizing Taylor vortices generated between the heat dissipation members when the wheel side is rotationally driven, the thermal conductivity between the heat dissipation members is increased and the light-emitting unit of the phosphor is effectively cooled.

[0003] Citation List

[0004] Patent Document

[0005] Patent Document 1: International Publication No. WO 2018 / 116689 Summary of the Invention

[0006] For a light source device of a projector, it is desirable to increase the light source power and miniaturize, and it is desirable to further improve the heat dissipation efficiency.

[0007] There is a desire to provide a light source device and a projection display device capable of improving the heat dissipation efficiency.

[0008] The light source device according to an embodiment of the present disclosure includes: a support substrate having a phosphor layer on one surface; a drive unit that rotationally drives the support substrate; a first support member disposed facing another surface opposite to the one surface of the support substrate; a plurality of first heat dissipation members having different heat dissipation performances depending on the distance from the phosphor layer, the plurality of first heat dissipation members being concentrically provided on the another surface of the support substrate; and a plurality of second heat dissipation members concentrically provided on a surface of the first support member facing the support substrate, the plurality of second heat dissipation members being alternately arranged with the plurality of first heat dissipation members.

[0009] A projection display device according to an embodiment of the present disclosure includes: a light source device; an image generation optical system that generates image light by modulating light from the light source device based on an input image signal; and a projection optical system that projects the image light generated by the image generation optical system. The light source device included in the projection display device includes the same components as the aforementioned light source device according to an embodiment of the present disclosure.

[0010] In the light source device according to an embodiment of the present disclosure and the projection display device according to an embodiment of the present disclosure, a plurality of concentric first heat dissipation members are provided on the back surface (the other surface) of the support substrate including the phosphor layer, and the plurality of first heat dissipation members each have different heat dissipation performances according to the distance from the phosphor layer. Specifically, as the distance from the phosphor layer decreases, a heat dissipation member having a higher heat dissipation performance is provided. This reduces the temperature of the phosphor layer due to the heat diffusion effect while suppressing an increase in weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic cross-sectional view of a configuration example of a phosphor wheel and a housing included in a light source device according to a first embodiment of the present disclosure.

[0012] Figure 2A is a plan view of the phosphor wheel shown Figure 1 when viewed from the front surface side.

[0013] Figure 2B is a plan view of the phosphor wheel shown Figure 1 when viewed from the back surface side.

[0014] Figure 3 is a schematic cross-sectional view of another configuration example of a phosphor wheel and a housing included in a light source device according to a first embodiment of the present disclosure.

[0015] Figure 4A is a cross-sectional view of an example of a process for manufacturing Figure 1 the phosphor wheel shown.

[0016] Figure 4B is a cross-sectional view of the process Figure 4A after that.

[0017] Figure 5 is a characteristic diagram showing a warped wheel substrate.

[0018] Figure 6 is a schematic diagram of an example of the overall configuration of a light source device including Figure 1 the phosphor wheel shown. ​​​​​​​​

[0019] Figure 7 is a schematic cross-sectional view of the configuration of the phosphor wheel and the housing included in the light source device according to the second embodiment of the present disclosure.

[0020] Figure 8 is a schematic cross-sectional view of the configuration of the phosphor wheel and the housing included in the light source device according to the third embodiment of the present disclosure.

[0021] Figure 9 is a schematic cross-sectional view of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 1 of the present disclosure.

[0022] Figure 10 is a schematic cross-sectional view of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 2 of the present disclosure.

[0023] Figure 11 is a schematic cross-sectional view of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 3 of the present disclosure.

[0024] Figure 12 is a schematic cross-sectional view of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 4 of the present disclosure.

[0025] Figure 13 is a schematic cross-sectional view of an example of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 5 of the present disclosure.

[0026] Figure 14 is a schematic cross-sectional view of another example of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 5 of the present disclosure.

[0027] Figure 15 is a schematic cross-sectional view of an example of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 6 of the present disclosure.

[0028] Figure 16 is a schematic cross-sectional view of another example of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 6 of the present disclosure.

[0029] Figure 17 is a schematic cross-sectional view of the configuration of the phosphor wheel and the housing included in the light source device according to Modification 7 of the present disclosure.

[0030] Figure 18 is Figure 1 a schematic diagram of another example of the overall configuration of the light source device including the phosphor wheel shown.

[0031] ​​​​​​​​​​​​Figure 19 is a schematic diagram showing an example of a configuration example of a projection display device including the light source device shown in Figure 6 .

[0032] Figure 20 is a schematic diagram showing another example of a configuration example of a projection display device including the light source device shown in Figure 6 . DETAILED DESCRIPTION

[0033] Embodiments of the present disclosure will be described in detail below with reference to the drawings. The following description is a specific example of the present disclosure, but the present disclosure is not limited to the following embodiments. In addition, the present disclosure is not limited to the arrangement, dimensions, dimensional ratios, etc. of the constituent elements shown in the drawings. It should be noted that the description is given in the following order.

[0034] 1. First Embodiment (an example in which a plurality of heat dissipation members are provided on the back surface of the wheel substrate, and the heat dissipation performance of the plurality of heat dissipation members varies depending on the distance from the phosphor layer)

[0035] 1-1. Configuration of the phosphor wheel and its periphery

[0036] 1-2. Method of manufacturing the phosphor wheel

[0037] 1-3. Configuration of the light source device

[0038] 1-4. Operation and effects

[0039] 2. Second Embodiment (an example of a phosphor wheel including a plurality of heat dissipation members with fins of different thicknesses)

[0040] 3. Third Embodiment (an example of a phosphor wheel including a plurality of heat dissipation members with fins of different lengths and thicknesses)

[0041] 4. Modification Examples

[0042] 4-1. Modification Example 1 (an example in which a plurality of heat dissipation members are formed integrally)

[0043] 4-2. Modification Example 2 (an example in which the outermost heat dissipation member is provided integrally with the wheel substrate)

[0044] 4-3. Modification Example 3 (an example in which a plurality of heat dissipation members are formed integrally with the wheel substrate)

[0045] 4-4. Modification Example 4 (an example in which another heat dissipation member is further provided on the inner circumference compared to the phosphor layer)

[0046] 4-5. Modification Example 5 (an example in which an inclined surface is provided on the peripheral edge portion of the housing) ​​

[0047] 4-6. Modification Example 6 (Example of Further Providing Another Heat Dissipation Member on the Front Surface of the Wheel Substrate)

[0048] 4-7. Modification Example 7 (Example of a Transmissive Phosphor Wheel)

[0049] 4-8. Modification Example 8 (Another Configuration Example of the Light Source Device)

[0050] 5. Application Example (Projection Display Device)

[0051] <1. First Embodiment>

[0052] Figure 1 An example of a cross-sectional configuration of a wavelength converter (phosphor wheel 10A) and a housing 20 included in a light source device (light source device 1) according to a first embodiment of the present disclosure is schematically shown. Figure 2A Schematically shown as viewed from the front surface side Figure 1 The planar configuration of the phosphor wheel 10A shown. Figure 2B Schematically shown as viewed from the back surface side Figure 1 The planar configuration of the phosphor wheel 10A shown. Figure 1 Shows along Figure 2A and Figure 2B The cross-sectional configuration taken along line I-I shown in. In addition, Figure 2A and Figure 2B Each shows a part of the respective fins 132a, 132b, and 132c of the heat dissipation members 13A, 13B, and 13C. The phosphor wheel 10A is used, for example, as a light-emitting device (wavelength converter) included in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later (see, for example, Figure 6 and Figure 18 ).

[0053] The light source device 1 according to the present embodiment includes: a phosphor wheel 10A that converts the wavelength of excitation light EL (e.g., blue light) output from a light source unit 1110, which will be described later, into the wavelength of fluorescence FL (e.g., yellow light) and outputs the wavelength-converted light; and a housing 20 that houses the phosphor wheel 10A. The phosphor wheel 10A has a phosphor layer 12 fixed to the front surface (one surface; surface 11S1) of a wheel substrate 11 having, for example, a circular planar shape. A plurality of concentric heat dissipation members 13 centered on the rotation center (O) of the wheel substrate 11 are provided on the back surface (the other surface; surface 11S2). A plurality of heat dissipation members (a plurality of fins 221) are provided inside the housing 20. The plurality of heat dissipation members (the plurality of fins 221) and the plurality of heat dissipation members 13 are provided in a nested manner. In the present embodiment, three heat dissipation members 13A, 13B, and 13C having different heat dissipation performances according to the distance from the phosphor layer 12 are provided as the plurality of heat dissipation members 13 on the back surface (surface 11S2) of the wheel substrate 11. A plurality of heat dissipation members 13 having different heat dissipation performances are provided on the back surface (surface 11S2) of the wheel-shaped substrate 11. It should be noted that Figure 1 , Figure 2A and Figure 2B each schematically shows the configuration of the phosphor wheel 10A and the housing 20 and may be different from the actual size and shape.

[0054] (1-1. Configuration of Phosphor Wheel and Its Periphery)

[0055] As described above, in the phosphor wheel 10A, the phosphor layer 12 is provided on the front surface (surface 11S1) of the circular wheel substrate 11, and three heat dissipation members 13A, 13B, and 13C are provided on the back surface (surface 11S2) of the circular wheel substrate 11. The phosphor layer 12 is formed in an annular shape, for example, around the rotation center O of the wheel substrate 11. The wheel substrate 11 is fixed to a motor 14, and, for example, during the operation of the light source device 1, the wheel substrate 11 can rotate in the direction of arrow C around an axis J14A passing through the rotation center (O). The phosphor wheel 10A rotates to prevent a decrease in light conversion efficiency while suppressing a local temperature rise caused by the application of the excitation light EL and maintaining structural stability.

[0056] The wheel substrate 11 serves as a substrate for supporting the phosphor layer 12 and also serves as a heat dissipation member. For example, the wheel substrate 11 includes an inorganic material (such as a metal material) and a ceramic material. As the constituent material of the wheel substrate 11, a material having high thermal conductivity is preferred. Specifically, examples of the metal material in the wheel substrate 11 include elemental metals such as aluminum (Al), copper (Cu), molybdenum (Mo), tungsten (W), cobalt (Co), chromium (Cr), platinum (Pt), tantalum (Ta), lithium (Li), zirconium (Zr), ruthenium (Ru), rhodium (Rh), and palladium (Pd), or alloys including one or more metals. Alternatively, as the metal material in the wheel substrate 11, alloys such as CuW containing 80 atomic % or more of W and CuMo containing 40 atomic % or more of Mo can be used. Examples of the ceramic material include ceramic materials containing silicon carbide (SiC), aluminum nitride (AlN), beryllium oxide (BeO), a composite material of Si and SiC, or a composite material of SiC and Al (where the content of SiC is 50% or more). In addition, quartz and glass can be used in addition to the elemental substances of Si and SiC and crystal materials such as diamond or sapphire. In particular, as the constituent elements of the wheel substrate 11, elemental substances of Mo, Si, and W having high thermal conductivity are preferred.

[0057] The phosphor layer 12 contains a plurality of phosphor particles and is fixed to the front surface (surface 11S1) of the wheel substrate 11. For example, the phosphor layer 12 is preferably formed in a plate shape and contains a so-called ceramic phosphor or an adhesive type porous phosphor. The adhesive binds one phosphor particle to another phosphor particle adjacent to the one phosphor particle. For example, the adhesive includes a crosslinked body of an inorganic material (such as sodium silicate). Sodium silicate represents a silicate compound, also known as sodium silicate, potassium silicate, or silicate soda, and represents a liquid in which anhydrous silicic acid (SiO2) and sodium oxide (Na2O) or potassium oxide (K2O) are mixed in a predetermined ratio. Sodium silicate is represented by the molecular formula Na2O·nSiO2.

[0058] The phosphor particles include particulate phosphors that absorb externally applied excitation light EL (for example, laser light) to emit fluorescence FL. For example, the phosphor particles include a fluorescent material that is excited by blue laser light having a wavelength in the blue wavelength range (for example, from 400 nm to 470 nm) to emit yellow fluorescence (light having a wavelength range between the red wavelength range and the green wavelength range). As such a fluorescent material, for example, a YAG (yttrium aluminum garnet) - based material is used.

[0059] It should be noted that as Figure 3As shown, for example, the phosphor layer 12 may be fixed to the wheel substrate 11, with a reflective film 15 inserted therebetween. The reflective film 15 is for reflecting the excitation light EL applied from the outside and the fluorescence FL emitted from the phosphor layer 12, thereby improving the luminous efficiency in the phosphor wheel 10A. For example, in addition to a dielectric multilayer film, the reflective film 15 includes a metal film containing a metal element such as aluminum (Al), silver (Ag), or titanium (Ti). It should be noted that when the wheel substrate 11 contains a light-reflective material, the reflective film 15 can be appropriately omitted.

[0060] As described above, in the phosphor wheel 10A, for example, three heat dissipation members 13A, 13B, and 13C are provided as a plurality of heat dissipation members 13 on the back surface (surface 11S2) of the wheel substrate 11. The heat dissipation members 13A, 13B, and 13C each correspond to a specific example of the "first heat dissipation member" of the present disclosure. As described above, the heat dissipation performance of the heat dissipation members 13A, 13B, and 13C varies depending on the distance from the phosphor layer 12. Specifically, the heat dissipation member 13A has the highest heat dissipation performance, the heat dissipation member 13B has the second highest heat dissipation performance, and the heat dissipation member 13C has the lowest heat dissipation performance. In the present embodiment, the heat dissipation member 13A having the highest heat dissipation performance is provided at the position closest to the phosphor layer 12 as the heat source, for example, immediately below the phosphor layer 12, as Figure 1 shown, and the heat dissipation member 13C having the lowest heat dissipation performance is provided at the position farthest from the phosphor layer 12, for example, on the peripheral edge portion of the wheel substrate 11, as Figure 1 shown. The heat dissipation members 13A, 13B, and 13C are arranged in sequence from the rotation center (O) of the wheel substrate 11.

[0061] The heat dissipation members 13A, 13B, and 13C include fixing portions 131 (131a, 131b, and 131c) joined to the back surface (surface 11S2) of the wheel substrate 11 and fins 132 (132a, 132b, and 132c) bent substantially parallel to the rotation axis J14 of the phosphor wheel 10A from the fixing portions 131. The heat dissipation members 13A, 13B, and 13C. The heat dissipation members 13A, 13B, and 13C are joined to the wheel substrate 11 via the fixing portions 131a, 131b, and 131c, respectively. As a result, for example, the heat dissipation members 13A, 13B, and 13C can rotate around the axis J14A together with the wheel substrate 11 during the operation of the light source device 1. As described above, the fins 132a, 132b, and 132c are bent in a direction substantially parallel to the rotation axis J14 of the phosphor wheel 10A, and each forms a cylindrical surface substantially parallel to the rotation axis J14. The cylindrical surface is preferably formed as a continuous surface around the rotation axis J14 as the center, but may have cuts extending in the rotation axis direction at one or more points, for example.

[0062] In the present embodiment, for example, the heat dissipation performance of each of the heat dissipation members 13A, 13B, and 13C is adjusted by the respective lengths of the fins 132a, 132b, and 132c. Specifically, the heat dissipation members 13A, 13B, and 13C respectively have fins 132a with a length of 11, fins 132b with a length of 12, and fins 132c with a length of 13, and satisfy the relationship of length 11 > 12 > 13. Therefore, the fins 132a of the heat dissipation member 13A closest to the phosphor layer 12 have the longest length, and as the distance from the phosphor layer 12 increases, the lengths of the fins 132b and 132c become shorter. This makes it possible to reduce the weight of the phosphor wheel 10A while maintaining the cooling efficiency of the heat generating body (phosphor layer 12) by the heat dissipation members 13A, 13B, and 13C.

[0063] Each of the heat dissipation members 13A, 13B, and 13C preferably contains a material having high thermal conductivity. Specifically, for example, each of the heat dissipation members 13A, 13B, and 13C desirably contains pure aluminum, aluminum alloy, copper alloy (such as beryllium copper), carbon material, graphite, etc. It should be noted that the heat dissipation members 13A, 13B, and 13C may contain the same material, or may each contain different materials from each other.

[0064] The housing 20 houses the phosphor wheel 10A including the heat dissipation member 13 and prevents dust from adhering to the phosphor wheel 10A. The housing 20 has a front portion 21, a rear portion 22, and a side portion 23. On the front portion 21, a lens 24 is provided at a position facing the phosphor layer 12 as a transmissive portion for transmitting the excitation light EL and the fluorescence FL. For example, on the rear portion 22, two fins 221a and 221b centered on the rotation center (O) of the wheel substrate 11 are provided as a plurality of concentric fins 221. That is, the rear portion 22 of the housing 20 corresponds to the "first support member" in the present disclosure, and each of the fins 221a and 221b corresponds to a specific example of the "second heat dissipation member" in the present disclosure.

[0065] Each of the fins 221a and 221b is integrally formed with the rear portion 22 with the same length, and each forms a cylindrical surface substantially parallel to the rotation axis J14 of the phosphor wheel 10A. The cylindrical surfaces of the fins 221a and 221b are each preferably formed as a continuous surface surrounding the rotation axis J14 as the center in a manner similar to the fins 132a, 132b, and 132c of the heat dissipation members 13A, 13B, and 13C, but may have cuts extending in the rotation axis direction at one or more points, for example. That is, the fins 132a, 132b, and 132c of the heat dissipation members 13A, 13B, and 13C and the fins 221a and 221b have surfaces that are opposite to each other and substantially parallel to each other.

[0066] In the present embodiment, the fins 221a and 221b are arranged in a nested manner with the fins 132a, 132b, and 132c of the heat dissipation members 13A, 13B, and 13C. Specifically, the fins 132a, 132b, and 132c and the fins 221a and 221b are arranged in the order of fin 132a, fin 221a, fin 132b, fin 221b, and fin 132c starting from the rotation center (O) of the wheel substrate 11.

[0067] The positions of the fins 132a, 221a, 132b, 221b, and 132c are preferably set in such a manner that, for example, the aspect ratio (A / B) of the distance (A) to the distance (B) is 2 or greater. The distance (A) is the distance between the opposing surfaces of the fins 132a and 221a facing each other, and the distance (B) is the distance between the fins 132a and 221a. Similarly, the aspect ratio of the distance between the opposing surfaces of the fins 132b and 221b facing each other to the distance between the fins 132b and 221b is preferably 2 or greater. Regarding the fin 132c, it is preferable that the distance between the fin 132c and the opposing surface of the side portion 23 of the housing 20 and the distance between the fin 132c and the side portion 23 have a similar configuration.

[0068] As a result, when the phosphor wheel 10A is rotationally driven, Taylor vortices are generated in the fluid (e.g., air) between the fins 132a and 221a, between the fins 132b and 221b, and between the fin 132c and the side portion 23. The Taylor vortices are generated by the centrifugal force acting on the gas. Therefore, in the present embodiment, the fins combined with the above aspect ratio have the following configuration: the fins (fins 221) on the outer peripheral side are fixed, and the fins (fins 132) on the inner peripheral side are rotationally driven. Therefore, the heat generated in the phosphor layer 12 and transferred from the wheel substrate 11 to the heat dissipation member 13 is effectively transferred to the fins 221a and 221b, which enables effective cooling of the phosphor layer 12.

[0069] It should be noted that the upper limit of the aspect ratio is preferably 10 or less, for example. This is because when the aspect ratio exceeds 10, the effect of improving the cooling performance decreases. In addition, this is because when the aspect ratio is 10 or greater, that is, when the portion corresponding to the fins becomes larger, the difficulty of manufacturing the heat dissipation members 13A, 13B, and 13C and the housing 20 becomes higher.

[0070] Preferably, the housing 20 is made of a material having high thermal conductivity. Specifically, the housing 20 desirably contains, for example, pure aluminum, aluminum alloy, copper alloy (such as beryllium copper), or the like.

[0071] It should be noted that in Figure 1In [the figure], as the housing 20, a sealed housing is shown, in which the front portion 21, the back portion 22, and the side portion 23 are joined to each other and completely isolated from the outside; however, the housing 20 may be an open housing in which the front surface (surface 11S1) side of the wheel substrate 11 is open. Further, in the present embodiment, the side portion 23 serves as a surface opposite to the fins 132c of the heat dissipation member 13C provided on the peripheral edge portion of the wheel substrate 11; however, another fin may be separately provided on the back portion 22 as a surface opposite to the fins 132c.

[0072] In the case where the housing 20 has a sealed structure, in addition to air as a fluid, the housing 20 may also be filled with a gas having a higher thermal conductivity than air. Specifically, the housing 20 is preferably filled with a gas having a higher thermal conductivity than the thermal conductivity of air (the thermal conductivity in an environment of 20 °C is 0.0257 W / mK). Examples of such a gas include helium (He). Not only gases but also liquids may be sealed in the housing 20. Examples of the liquid sealed in the housing 20 include water, silicone oil, etc., and a liquid having as low a viscosity as possible is preferably selected. It should be noted that in the case where a liquid is sealed in the housing 20, the phosphor wheel 10A can be rotated by magnetic drive.

[0073] Further, for example, a heat dissipation structure 30 may be provided outside the housing 20, as Figure 1 shown. This makes it possible to improve the heat dissipation efficiency in the housing 20. For example, the heat dissipation structure 30 includes a support member 31 joined to the back surface (surface 20S2) of the housing 20 and a plurality of fins 32 mounted on the support member 31. The heat transferred from the phosphor wheel 10A to the housing 20 diffuses into the air.

[0074] The heat dissipation structure 30 may have the following configuration: in which a plurality of heat pipes are mounted on the back surface (surface 20S2) of the housing 20, and a radiator is coupled to the ends of the heat pipes. Examples of other heat dissipation structures include liquid cooling systems. In a liquid cooling system, pipes are installed on, for example, the surface or side surface of the housing 20, and a cooling medium flows in the pipes, which causes the heat of the housing 20 to be transferred to the cooling medium, thereby cooling the housing 20. The heat transferred to the cooling medium is dissipated into the air through a radiator or the like.

[0075] (1-2. Method for manufacturing a phosphor wheel)

[0076] The phosphor wheel 10A according to the present embodiment can be manufactured, for example, as follows. Figure 4A And Figure 4B Each is a schematic diagram of a process for manufacturing Figure 1 the phosphor wheel 10A shown.

[0077] First, as Figure 4AAs shown, the heat dissipation members 13A, 13B, and 13C are joined to the back surface (surface 11S2) of the wheel substrate 11. After that, as Figure 4B shown, the phosphor layer 12 is joined to the front surface (surface 11S1) of the wheel substrate 11.

[0078] Figure 5 The warpage of the wheel substrate 11 is shown. Here, an aluminum substrate having a diameter of 95 mm and a thickness of 0.8 mm is used as the wheel substrate 11, and a sintered phosphor is used as the phosphor layer 12. In the case where the phosphor layer 12 is fixed to the aluminum wheel substrate 11 using a thermosetting adhesive, the warpage of the wheel substrate 11 after heat curing is 0.4. In contrast, as in the present embodiment, in the case where a plurality of concentric heat dissipation members 13 are fixed to the back surface (surface 11S2) of the wheel substrate 11 and then the phosphor layer 12 is fixed to the front surface (surface 11S1) of the wheel substrate 11, the warpage of the wheel substrate 11 after heat curing is about 0.07. As described above, by joining the phosphor layer 12 after joining the heat dissipation member 13 to the back surface of the wheel substrate 11, the warpage can be reduced to about 1 / 6 of the warpage of the wheel substrate 11.

[0079] (1 - 3. Configuration of the light source device)

[0080] Figure 6 is a schematic diagram of the overall configuration of the light source device 1. It should be noted that in Figure 6 the phosphor wheel 10A is shown together with the housing 20 in a simplified manner. The light source device 1 includes: a phosphor wheel 10A as a wavelength converter; a light source unit 1110; a polarization beam splitter PBS 1112; a quarter-wave plate 1113; and a condenser optical system 1114 (1114A and 1114B). The components included in the light source device 1 are arranged in the order of the condenser optical system 1114, the quarter-wave plate 1113, the PBS 1112, and the light source unit 1100 on the optical path of the white light (multiplexed light Lw) output from the phosphor wheel 10A from one side of the phosphor wheel 10A.

[0081] The light source unit 1110 includes a solid-state light-emitting device that outputs light having a predetermined wavelength. In the present embodiment, as the solid-state light-emitting device, a semiconductor laser device that oscillates excitation light EL (for example, blue laser light having a wavelength of 445 nm or 455 nm) is used, and linearly polarized light (for example, S-polarized light) of the excitation light EL is output from the light source unit 1110.

[0082] Note that, when the light source unit 1110 includes a semiconductor laser device, excitation light EL with a predetermined output can be obtained by one semiconductor laser device, or excitation light EL with a predetermined output can be obtained by multiplexing the light output from a plurality of semiconductor laser devices. In addition, the wavelength of the excitation light EL is not limited to the above value, but any wavelength can be used as long as the wavelength is within the wavelength band of light called blue light.

[0083] The PBS 1112 separates the excitation light EL entering from the light source unit 1110 and the multiplexed light Lw entering from the phosphor wheel 10A. Specifically, the PBS 1112 transmits the excitation light EL incident from the light source unit 1110 toward the quarter-wave plate 1113. In addition, the PBS 1112 reflects the multiplexed light Lw incident from the phosphor wheel 10A and transmitted through the condenser optical system 1114 and the quarter-wave plate 1113. The reflected multiplexed light Lw enters the illumination optical system 2 (described later).

[0084] The quarter-wave plate 1113 is a phase difference device that generates a π / 2 phase difference with respect to the incident light. When the incident light is linearly polarized light, the quarter-wave plate 1113 converts the linearly polarized light into circularly polarized light; when the incident light is circularly polarized light, the quarter-wave plate 1113 converts the circularly polarized light into linearly polarized light. In the present embodiment, the excitation light EL, which is linearly polarized light output from the PBS 1112, is converted into excitation light EL as circularly polarized light by the quarter-wave plate 1113. In addition, the excitation light component of the polarized light included in the multiplexed light Lw output from the phosphor wheel 10A is converted into linearly polarized light by the quarter-wave plate 1113.

[0085] The condenser optical system 1114 (1114A and 1114B) converges the excitation light EL output from the quarter-wave plate 1113 to have a predetermined spot diameter, and outputs the converged excitation light EL toward the phosphor wheel 10A. In addition, the condenser optical system 1114 converts the multiplexed light Lw output from the phosphor wheel 10A into parallel light and outputs the parallel light to the quarter-wave plate 1113. Note that, for example, the condenser optical system 1114 may include a single collimating lens and may be configured to convert incident light into parallel light using a plurality of lenses.

[0086] The configuration of the optical member that separates the excitation light EL entering from the light source unit 1110 and the multiplexed light Lw output from the phosphor wheel 10A is not limited to the PBS 1112, but any optical member can be used as long as the optical member has a configuration capable of performing the above-described light separation operation.

[0087] (1-4. Operation and effects)

[0088] The light source device 1 according to the present embodiment includes a phosphor wheel 10A. On the back surface (surface 11S2) of the wheel substrate 11 provided with the phosphor layer 12, three heat dissipation members 13A, 13B, and 13C having different heat dissipation performances according to the distance from the phosphor layer 12 are provided concentrically. The heat dissipation performance of each of the heat dissipation members 13A, 13B, and 13C is as follows: heat dissipation member 13A > heat dissipation member 13B > heat dissipation member 13C. The heat dissipation member 13A having the highest heat dissipation performance is provided closest to the phosphor layer 12 (for example, immediately below the phosphor layer 12), then the heat dissipation member 13B is provided, and the heat dissipation member 13C having the lowest heat dissipation performance is provided at the position farthest from the phosphor layer 12 (for example, on the peripheral edge portion of the wheel substrate 11). This makes it possible to effectively dissipate the heat generated by the phosphor layer 12 due to the application of the excitation light EL while suppressing an increase in the weight of the phosphor wheel 10A. This will be described below.

[0089] In recent years, laser light sources with small size, long life, and fast rise and fall have been widely used as white light sources. Although semiconductor lasers are mainly used as lasers, the semiconductor lasers have low luminous efficiency in the GB light sources of the RGB light sources required for white light sources. For this reason, a light source device (phosphor laser light source) of a laser-phosphor system that generates white light by synthesizing blue laser and yellow fluorescence extracted by exciting a phosphor with blue laser is widely used.

[0090] However, there is a problem of temperature quenching in which the luminous efficiency of the phosphor decreases as the temperature rises. Therefore, a method of suppressing the temperature rise of the phosphor by using a rotating phosphor wheel and diffusing the heat generated by laser excitation is adopted. Such a light source device may reduce the luminous efficiency or may be damaged due to dust adhering to the phosphor wheel. Therefore, in actual products, the phosphor wheel is provided in a sealed space. As described above, as a heat dissipation technique for the phosphor wheel provided in the sealed space, there are the following methods: providing concentric fins nested with each other on the back surface of the wheel substrate and the surface of the sealed housing opposite to the back surface of the wheel substrate, and using Taylor vortices generated between the fins when the wheel substrate is rotationally driven to improve the cooling efficiency of the light emitting unit of the phosphor.

[0091] However, in the light source device having the above heat dissipation structure, the balance between the heat dissipation efficiency and the weight of the phosphor wheel is considered a problem. The heat dissipation efficiency of the above light source device can be improved by increasing the number of fins and increasing the length of the fins, but in this case, the weight increases, resulting in problems of increased size and increased drive motor cost.

[0092] In contrast, the light source device 1 according to the present embodiment includes, for example, three heat dissipation members 13A, 13B, and 13C. The heat dissipation performances of the three heat dissipation members 13A, 13B, and 13C are different according to the distance from the phosphor layer 12, and they are provided on the back surface (surface 11S2) of the wheel substrate 11 on which the phosphor layer 12 is provided. Specifically, as the distance from the phosphor layer 12 decreases, a heat dissipation member (heat dissipation member 13A) with higher heat dissipation performance is provided, and as the distance from the phosphor layer 12 increases, a heat dissipation member (heat dissipation member 13C) with lower heat dissipation performance is provided. This makes it possible to effectively reduce the temperature of the phosphor layer 12 that rises due to the application of the excitation light EL while suppressing an increase in the weight of the phosphor wheel 10A.

[0093] As described above, in the present embodiment, on the back surface (surface 11S2) of the wheel substrate 11 on which the phosphor layer 12 is provided, as the distance from the phosphor layer 12 decreases, a heat dissipation member (heat dissipation member 13A) with higher heat dissipation performance is provided, and as the distance from the phosphor layer 12 increases, a heat dissipation member (heat dissipation member 13C) with lower heat dissipation performance is provided. This makes it possible to effectively cool the phosphor layer 12 that generates heat due to the application of the excitation light EL while suppressing an increase in the weight of the phosphor wheel 10A. That is, the heat dissipation efficiency can be improved.

[0094] In addition, in the present embodiment, the three heat dissipation members 13A, 13B, and 13C are provided, for example, in a concentric circle shape on the back surface (surface 11S2) of the wheel substrate 11. Therefore, when the phosphor layer 12 is fixed to the front surface (surface 11S1), warping of the wheel substrate 11 can be reduced. This suppresses deflection of the phosphor surface and allows stable power to be output as a light source. That is, flicker can be suppressed. Noise can also be suppressed.

[0095] Next, descriptions of the second and third embodiments, modification examples 1 to 8, and application examples of the present disclosure will be given. Hereinafter, components similar to those of the foregoing first embodiment are denoted by the same reference numerals, and their descriptions are omitted as appropriate.

[0096] <2. Second Embodiment>

[0097] Figure 7Schematically shows a cross-sectional configuration of a wavelength converter (phosphor wheel 10B) and a housing 20 in a light source device (light source device 1) according to a second embodiment of the present disclosure. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10B is used, for example, as a light emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later. The phosphor wheel 10B according to the present embodiment is different from the foregoing first embodiment in that three heat dissipation members 43A, 43B, and 43C each having fins 432a, 432b, and 432c with different thicknesses are used as heat dissipation members 43 having different heat dissipation performances.

[0098] Similar to the phosphor wheel 10A, in the phosphor wheel 10B, three concentric heat dissipation members 43A, 43B, and 43C are provided as a plurality of heat dissipation members 43 on the back surface (surface 11S2) side of the wheel substrate 11. Similar to the heat dissipation members 13A, 13B, and 13C, the heat dissipation members 43A, 43B, and 43C include fixing portions 431 (431a, 431b, and 431c) joined to the back surface (surface 11S2) of the wheel substrate 11 and fins 432 (432a, 432b, and 432c) bent substantially parallel to the rotation axis J14 of the phosphor wheel 10B.

[0099] Among the heat dissipation members 43A, 43B, and 43C, the heat dissipation member 43A has the highest heat dissipation performance, the heat dissipation member 43B has the second highest heat dissipation performance, and the heat dissipation member 43C has the lowest heat dissipation performance. In the present embodiment, similar to the foregoing first embodiment, the heat dissipation member 43A having the highest heat dissipation performance is disposed at a position closest to the phosphor layer 12 as a heat source, for example, immediately below the phosphor layer 12, and the heat dissipation member 43C having the lowest heat dissipation performance is disposed at a position farthest from the phosphor layer 12, for example, on the peripheral edge portion of the wheel substrate 11. That is, the heat dissipation members 43A, 43B, and 43C are sequentially disposed from the rotation center (O) of the wheel substrate 11.

[0100] In the present embodiment, as described above, the heat dissipation performance of each of the heat dissipation members 43A, 43B, and 43C is adjusted by the respective thicknesses of the fins 432a, 432b, and 432c. Specifically, the heat dissipation members 43A, 43B, and 43C respectively have fins 432a with a thickness of t1, fins 432b with a thickness of t2, and fins 432c with a thickness of t3, and satisfy the thickness relationship t1 > t2 > t3. Therefore, the fins 432a of the heat dissipation member 43A closest to the phosphor layer 12 are the thickest, and as the distance from the phosphor layer 12 increases, the thicknesses of the fins 432b and 432c become thinner. This makes it possible to reduce the weight of the phosphor wheel 10A while maintaining the cooling efficiency of the heat generating body (phosphor layer 12) by the heat dissipation members 43A, 43B, and 43C.

[0101] As described above, in the present embodiment, the three heat dissipation members 43A, 43B, and 43C having fins 432a, 432b, and 432c with different thicknesses are arranged such that the heat dissipation member 43A having the highest heat dissipation performance is disposed at the position closest to the phosphor layer 12 (for example, immediately below the phosphor layer 12), and the heat dissipation member 43C having the lowest heat dissipation performance is disposed at the position farthest from the phosphor layer 12 (for example, on the peripheral edge portion of the wheel substrate 11). This makes it possible to obtain an effect similar to that of the foregoing first embodiment.

[0102] <3. Third Embodiment>

[0103] Figure 8 The cross-sectional configuration of the wavelength converter (phosphor wheel 10C) and the housing 20 in the light source device (light source device 1) according to the third embodiment of the present disclosure is schematically shown. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10C is used, for example, as a light emitting device (wavelength converter) in a light source device (for example, light source device 1) of a projection display device (projector 1000) described later. The phosphor wheel 10C according to the present embodiment is different from the foregoing first embodiment in that three heat dissipation members 53A, 53B, and 53C having fins 532a, 532b, and 532c with different lengths and thicknesses are employed as the heat dissipation members 53 having different heat dissipation performances.

[0104] Similar to the phosphor wheel 10A, in the phosphor wheel 10C, three concentric heat dissipation members 53A, 53B, and 53C are provided as a plurality of heat dissipation members 53 on the back surface (surface 11S2) side of the wheel substrate 11. The heat dissipation members 53A, 53B, and 53C include fixing portions 531 (531a, 531b, and 531c) joined to the back surface (surface 11S2) of the wheel substrate 11 and fins 532 (532a, 532b, and 532c) bent substantially parallel to the rotation axis J14 of the phosphor wheel 10C.

[0105] Among the heat dissipation members 53A, 53B, and 53C, the heat dissipation member 53A has the highest heat dissipation performance, the heat dissipation member 53B has the second highest heat dissipation performance, and the heat dissipation member 53C has the lowest heat dissipation performance. In the present embodiment, similar to the foregoing first embodiment, the heat dissipation member 53A having the highest heat dissipation performance is disposed at a position closest to the phosphor layer 12 as a heat source, for example, immediately below the phosphor layer 12, and the heat dissipation member 53C having the lowest heat dissipation performance is disposed at a position farthest from the phosphor layer 12, for example, on the peripheral edge portion of the wheel substrate 11. That is, the heat dissipation members 53A, 53B, and 53C are sequentially disposed from the rotation center (O) of the wheel substrate 11.

[0106] In the present embodiment, as described above, the heat dissipation performance of each of the heat dissipation members 53A, 53B, and 53C is adjusted by the respective lengths and respective thicknesses of the fins 532a, 532b, and 532c. Specifically, the heat dissipation members 53A, 53B, and 53C respectively have fins 532a with a length of l1 and a thickness of t1, fins 532b with a length of l2 and a thickness of t2, and fins 532c with a length of l3 and a thickness of t3, and satisfy the length relationship l1 > l2 > l3 and the thickness relationship t1 > t2 > t3. Therefore, the fins 532a of the heat dissipation member 53A disposed closest to the phosphor layer 12 have the longest length and the thickest thickness, and as the distance from the phosphor layer 12 increases, the lengths of the fins 532b and 532c become shorter and the thicknesses become thinner. This makes it possible to reduce the weight of the phosphor wheel 10A while maintaining the cooling efficiency of the heating element (phosphor layer 12) by the heat dissipation members 53A, 53B, and 53C.

[0107] As described above, in the present embodiment, the three heat dissipation members 53A, 53B, and 53C having fins 532a, 532b, and 532c with different lengths and thicknesses are arranged such that the heat dissipation member 53A having the highest heat dissipation performance is disposed at a position closest to the phosphor layer 12 (for example, immediately below the phosphor layer 12), and the heat dissipation member 53C having the lowest heat dissipation performance is disposed at a position farthest from the phosphor layer 12 (for example, on the peripheral edge portion of the wheel substrate 11). This makes it possible to improve the heat dissipation efficiency compared to the effects similar to those of the foregoing first embodiment.

[0108] For example, in the case of a phosphor wheel provided with four concentric fins having a uniform cross-sectional shape on a wheel substrate 11 with a diameter of 95 mm and a thickness of 0.8 mm and a phosphor wheel provided with four fins having different lengths and different thicknesses on the wheel substrate 11 as in the present embodiment, and in the case where the wheel weights are the same, the latter phosphor wheel is expected to have a peak cooling effect of about 5%. Further, for example, if the phosphor wheels have the same cooling efficiency, the weight of the latter phosphor wheel can be reduced, and the life of the motor 14 of the latter phosphor wheel can be extended.

[0109] <4. Modification Example>

[0110] (4-1. Modification Example 1)

[0111] Figure 9 The cross-sectional configuration of the wavelength converter (phosphor wheel 10D) and the housing 20 in the light source device (light source device 1) according to Modification Example 1 of the present disclosure is schematically shown. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10D is used, for example, as a light-emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later. The phosphor wheel 10D according to the present modification example is different from the foregoing third embodiment and the like in that a plurality of fins 632 provided on the back surface (surface 11S2) of the wheel substrate 11 are integrally formed.

[0112] Similar to the phosphor wheel 10C according to the foregoing third embodiment, in the phosphor wheel 10D, three concentric fins 632a, 632b, and 632c having different lengths and different thicknesses are integrally formed as a plurality of heat dissipation members 63 on the back surface (surface 11S2) side of the wheel substrate 11. In the present modification example, the fins 632a, 632b, and 632c are formed on a common fixing portion (fixing portion 631) joined to the back surface (surface 11S2) of the wheel substrate 11.

[0113] Such a plurality of heat dissipation members 63 formed integrally can be manufactured, for example, by cutting, casting, 3D printing, or the like.

[0114] As described above, in the present modification example, the fins 632a, 632b, and 632c included in the plurality of heat dissipation members 63 are integrally formed on the common fixing portion (fixing portion 631). This increases the contact area between the wheel substrate 11 and the heat dissipation members 63, thereby reducing the contact resistance. Therefore, compared with the foregoing third embodiment, the heat dissipation efficiency can be further improved.

[0115] (4-2. Modification Example 2)

[0116] Figure 10 Schematically shows a cross-sectional configuration of a wavelength converter (phosphor wheel 10E) and a housing 20 in a light source device (light source device 1) according to Modification 2 of the present disclosure. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10E is, for example, used as a light-emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later. The phosphor wheel 10E according to this modification is different from the third embodiment described above in that among a plurality of heat dissipation members 73 provided on the back surface (surface 71S2) of the wheel substrate 71, the heat dissipation member 73C provided on the peripheral edge portion of the wheel substrate 71 is integrally formed with the wheel substrate 71.

[0117] Similar to the phosphor wheel 10C according to the foregoing third embodiment, the phosphor wheel 10E is provided with three concentric heat dissipation members 53A, 53B, and 73C having different lengths and different thicknesses as a plurality of heat dissipation members 73 on the back surface (surface 71S2) side of the wheel substrate 71. In this modification, among the three heat dissipation members 53A, 53B, and 73C, by bending the peripheral edge portion of the wheel substrate 71 toward the back surface (surface 71S2), the fins 732c of the heat dissipation member 73C provided on the outermost periphery are integrally formed with the wheel substrate 71.

[0118] As described above, in this modification, among the plurality of heat dissipation members 73, the heat dissipation member 73C provided on the outermost periphery is integrally formed with the wheel substrate 71. This eliminates the contact resistance between the outermost heat dissipation member 73C and the wheel substrate 71. Therefore, compared with the foregoing third embodiment, the heat dissipation efficiency can be further improved.

[0119] (4-3. Modification 3)

[0120] Figure 11 Schematically shows a cross-sectional configuration of a wavelength converter (phosphor wheel 10F) and a housing 20 in a light source device (light source device 1) according to Modification 3 of the present disclosure. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10F is, for example, used as a light-emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later. The phosphor wheel 10F according to this modification is different from the third embodiment described above in that a plurality of heat dissipation members 83 provided on the back surface (surface 81S2) of the wheel substrate 81 are integrally formed with the wheel substrate 81.

[0121] Similar to the phosphor wheel 10C of the foregoing third embodiment, the phosphor wheel 10F is provided with three concentric heat dissipation members 83A, 83B, and 83C having different lengths and different thicknesses as a plurality of heat dissipation members 83 on the back surface (surface 81S2) side of the wheel substrate 81. In this modification, the three heat dissipation members 83A, 83B, and 83C are integrally formed with the wheel substrate 81.

[0122] Such a plurality of heat dissipation members 83 formed integrally can be manufactured, for example, by cutting, casting, 3D printing, or the like.

[0123] As described above, in this modification, the plurality of heat dissipation members 83 provided on the back surface (surface 81S2) of the wheel substrate 81 are integrally formed with the wheel substrate 81. This eliminates the contact resistance between the outermost heat dissipation member 83C and the wheel substrate 81. Therefore, compared with the foregoing modification 2, the heat dissipation efficiency can be further improved.

[0124] In this modification, as Figure 3 shown, it is preferable that the phosphor layer 12 is fixed to the wheel substrate 81 via the reflective film 15. As a result, the surface roughness and reflectivity required for the surface of the wheel substrate 81 in contact with the phosphor layer 12, which is integrally formed with the plurality of heat dissipation members 83 manufactured by cutting or 3D printing, are reduced. Therefore, the cost can be reduced.

[0125] (4-4. Modification 4)

[0126] Figure 12 The cross-sectional configuration of the wavelength converter (phosphor wheel 10C) and the housing 20 in the light source device (light source device 1) according to Modification 4 of the present disclosure is schematically shown. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10C is used, for example, as a light-emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later. The phosphor wheel 10C according to this modification is a modification of the foregoing third embodiment, in which a heat dissipation member (e.g., heat dissipation member 53D) is further provided on the inner circumference of the phosphor layer 12 as a plurality of heat dissipation members 53 provided on the back surface (surface 11S2) of the wheel substrate 11. In addition, the housing 20 is further provided with fins 221d that engage with the heat dissipation member 53D.

[0127] As described above, a heat dissipation member 53D is further provided on the inner circumference of the phosphor layer 12. This makes it possible to further improve the heat dissipation efficiency without increasing the external dimensions of the phosphor wheel 10C.

[0128] (4-5. Modification 5)

[0129] Figure 13Schematically shows a cross-sectional configuration of a wavelength converter (phosphor wheel 10C) and a housing 20 in a light source device (light source device 1) according to Modification 5 of the present disclosure. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10C is used, for example, as a light emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later. The phosphor wheel 10C according to this modification is a modification of the foregoing third embodiment, in which an inclined surface 20X is formed on a peripheral edge portion on the back side of the housing 20 according to the shape change of a plurality of heat dissipation members 53A, 53B, and 53C provided on the wheel substrate 11.

[0130] As described above, according to the shape change of the heat dissipation members 53A, 53B, and 53C, for example, the lengths of the fins 532a, 532b, and 532c, an inclined surface 20X is provided on a peripheral edge portion on the back side of the housing 20. This shortens the path for heat discharged from the heat dissipation members 53A and 53B to the fins 221a and 221b to the outside air, and enables the reduction of the thermal resistance. Therefore, compared with the foregoing third embodiment, the heat dissipation efficiency can be further improved. In addition, the housing 20 for accommodating the phosphor wheel 10C can also be miniaturized.

[0131] It should be noted that although Figure 13 an example in which the inclined surface 20X is provided on a peripheral edge portion on the back side of the housing 20 is shown, the shape of the housing 20 is not limited thereto. For example, as Figure 14 shown, steps 20Y1 and 20Y2 can be provided on a peripheral edge portion on the back side of the housing 20 according to the shape change of the heat dissipation members 53A, 53B, and 53C.

[0132] (4-6. Modification 6)

[0133] Figure 15 Schematically shows a cross-sectional configuration of a wavelength converter (phosphor wheel 10G) and a housing 20 in a light source device (light source device 1) according to Modification 6 of the present disclosure. Similar to the phosphor wheel 10A according to the foregoing first embodiment, the phosphor wheel 10G is used, for example, as a light emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) described later. In the phosphor wheel 10G according to this modification, a plurality of heat dissipation members 56 are further provided on the outer periphery of the phosphor layer 12 on the front surface (surface 11S1) of the wheel substrate 11.

[0134] In the phosphor wheel 10G, on the front surface (surface 11S1) side as well as on the back surface (surface 11S2) side of the wheel substrate 11, a plurality of concentric heat dissipation members 56 are provided, and each heat dissipation member 56 has a different heat dissipation function and is centered on the rotation center (O) of the wheel substrate 11. In this modified example, similar to the phosphor wheel 10C according to the foregoing third embodiment, for example, two concentric heat dissipation members 56A and 56B having different lengths and different thicknesses are provided as the plurality of heat dissipation members 56. Regarding the two heat dissipation members 56A and 56B, the heat dissipation performance of the heat dissipation member 56A is higher than that of the heat dissipation member 56B, and the distance of the heat dissipation member 56A from the phosphor layer 12 is smaller than the distance of the heat dissipation member 56B from the phosphor layer 12. The heat dissipation performance of the heat dissipation member 56B is lower than that of the heat dissipation member 56A, and it is provided, for example, on the peripheral edge portion of the wheel substrate 11. The two heat dissipation members 56A and 56B each correspond to a specific example of the "third heat dissipation member" of the present disclosure.

[0135] In addition, in this modified example, for example, two concentric fins 211 (211a, 211b) centered on the rotation center (O) of the wheel substrate 11 are provided, for example, on the front surface portion 21 of the housing 20, and are provided in a nested manner with the heat dissipation members 56A and 56B provided on the front surface (surface 11S1) of the wheel substrate 11. That is, the front surface portion 21 of the housing 20 corresponds to a specific example of the "second support member" of the present disclosure, and the two fins 211 (211a and 211b) respectively correspond to specific examples of the "fourth heat dissipation member" of the present disclosure.

[0136] As described above, in this modified example, two concentric heat dissipation members 56A and 56B having different heat dissipation performances are provided on the front surface (surface 11S1) of the wheel substrate 11, and further, two fins 211a and 211b are provided on the front surface portion 21 of the housing 20 in a nested manner with the two concentric heat dissipation members 56A and 56B. As a result, when the phosphor wheel 10G is rotationally driven, Taylor vortices are generated in the fluid between the heat dissipation member 56A and the fin 211a and between the heat dissipation member 56B and the fin 211b, so that the heat generated by the phosphor layer 12 can also be effectively transferred from the front surface (surface 11S1) side of the wheel substrate 11 to the housing 20. Therefore, compared with the foregoing third embodiment, the heat dissipation efficiency can be further improved.

[0137] It should be noted that although Figure 15 an example in which the motor 14 is provided on the back surface (surface 11S2) side of the wheel substrate 11 is shown, for example, the motor 14 can be provided on the front surface (surface 11S1) side of the wheel substrate 11, as Figure 16As shown, this makes it possible to shorten the lengths of fins 221a and 221b formed on the back portion 22, and to shorten the path through which the heat that has been transferred from the heat dissipation members 53A and 53B to the fins 221a and 221b is discharged to the outside air. Therefore, compared with the aforementioned Modification 5, the thermal resistance can be reduced, and the heat dissipation efficiency can be further improved. This similarly applies to the first to third embodiments, Modifications 1 to 5, and Modification 7 to be described later.

[0138] (4-7. Modification 7)

[0139] Figure 17 Schematically shows a cross-sectional configuration of a wavelength converter (phosphor wheel 10H) and a housing 20 in a light source device (light source device 1) according to Modification 7 of the present disclosure. Similar to the phosphor wheel 10A according to the aforementioned first embodiment, the phosphor wheel 10H is used, for example, as a light-emitting device (wavelength converter) in a light source device (e.g., light source device 1) of a projection display device (projector 1000) to be described later. The phosphor wheel 10H according to this modification is a so-called transmissive wavelength converter, in which the fluorescence FL converted in the phosphor layer 12 is emitted from the side opposite to the incident direction of the excitation light EL.

[0140] Similar to the phosphor wheel 10C of the aforementioned third embodiment, the phosphor wheel 10H is provided with four concentric heat dissipation members 93A, 93B, 93C, and 93D having different lengths and different thicknesses as a plurality of heat dissipation members 93 on the back surface (surface 91S2) side of the wheel substrate 11.

[0141] The four heat dissipation members 93A, 93B, 93C, and 93D are arranged in such a manner that, similar to Modification 4, the heat dissipation members 93A, 93B, and 93C are provided on the outer periphery of the phosphor layer 12, and the heat dissipation member 93D is provided on the inner periphery of the phosphor layer 12. Among the four heat dissipation members 93A, 93B, 93C, and 93D, the heat dissipation members 93A and 93D have higher heat dissipation performance than the other two heat dissipation members 93B and 93C, and the heat dissipation performance of the heat dissipation members 93A and 93D is the same. The two heat dissipation members 93A and 93D are arranged, for example, in such a way that the fixing portions 931a and 931b extend in opposite directions so as not to prevent the excitation light EL entering from the back surface (surface S2) side of the housing 20 from being applied to the phosphor layer 12.

[0142] In addition, a lens 25 is provided at the position where the excitation light EL enters in the back surface portion 22 of the housing 20 (at the position facing the phosphor layer 12). The lens 25 can be, for example, a concave lens that controls the degree to which the excitation light EL is applied to the phosphor layer 12.

[0143] As described above, the present technology can be applied to a transmissive wavelength converter (phosphor wheel 10H). In addition to the effects similar to those of the aforementioned third embodiment, an increase in the weight of the phosphor wheel 10H can be suppressed and the phosphor layer 12 heated by the application of the excitation light EL can be effectively cooled, so that the heat dissipation efficiency can be improved.

[0144] Note that, although Figure 17 an example is shown in which the excitation light EL enters through the back surface (surface S2) side of the housing 20 and the fluorescence FL is output through the front surface (surface S1) side of the housing 20, this example is not limited thereto, but the excitation light EL may enter through the front surface (surface S1) side of the housing 20 and the fluorescence FL may be output through the back surface (surface S2) side of the housing 20.

[0145] (4-8. Modification Example 8)

[0146] Figure 18 is a schematic diagram of another configuration example of the light source device 1 shown in the aforementioned first embodiment. The light source device 1 may have the following configuration, for example.

[0147] The light source device 1 includes a phosphor wheel 10A, a diffuser 1127, a light source unit 1110 that emits excitation light or laser light, lenses 1121 to 1124, a dichroic mirror 1125, and a reflection mirror 1126. The diffuser 1127 is coupled to a motor 1128 and can rotate about an axis J1127. The light source unit 1110 includes a first laser group 1110A and a second laser group 1110B. The first laser group 1110A includes a plurality of semiconductor laser devices 1111A that oscillate excitation light (for example, having a wavelength of 445 nm or 455 nm), and the second laser group 1110B includes a plurality of semiconductor laser devices 1111B that oscillate blue laser light (for example, having a wavelength of 465 nm). Here, for convenience, the excitation light oscillated by the first laser group 1110A is denoted by EL1, and the blue laser light (hereinafter simply referred to as blue light) oscillated by the second laser group 1110B is denoted by EL2.

[0148] In the light source device 1, the phosphor wheel 10A is arranged such that the excitation light EL1 from the first laser group 1110A that has passed through the lens 1121, the dichroic mirror 1125, and the lens 1122 enters the phosphor layer 12. The fluorescence FL output from the phosphor wheel 10A is reflected by the dichroic mirror 1125, then passes through the lens 1123, and is emitted toward the outside, for example, toward the illumination optical system 2 described later. The diffuser 1127 diffuses the blue light (laser EL2) from the second laser group 1110B that has passed through the mirror 1126. The blue light (laser EL2) diffused by the diffuser 1127 passes through the lens 1124 and the dichroic mirror 1125, and then passes through the lens 1123 and is emitted toward the outside, that is, toward the illumination optical system 2.

[0149] It should be noted that it is desirable to provide a cooling fan in the light source device 1 to cool the heat generated in the phosphor layer 12 related to the application of the excitation light EL1 and the laser EL2. In addition, the layout of each component included in the light source device 1 is not limited to Figure 18 the configuration shown.

[0150] <5. Application Example>

[0151] Next, with reference to Figure 19 and Figure 20 the projection display devices (projectors 1000 and 2000) including the light source device 1 having a phosphor wheel 10A (or any one of the phosphor wheels 10B, 10C, 10D, 10E, 10F, 10G, and 10H) will be described. Figure 19 An example of a reflective 3LCD projector (projector 1000) that performs light modulation by a reflective liquid crystal panel (LCD) is illustrated. Figure 20 An example of a transmissive 3LCD projector (projector 2000) that performs light modulation by a transmissive liquid crystal panel (LCD) is illustrated. It should be noted that the projection display device according to the present disclosure can also be applied to projectors that use, for example, a digital micromirror device (DMD) or the like instead of the reflective liquid crystal panel and the transmissive liquid crystal panel.

[0152] (Application Example 1)

[0153] Figure 19 A configuration example of a reflective 3LCD projector 1000 that performs light modulation by a reflective liquid crystal panel (LCD) is shown. The projector 1000 sequentially includes, for example, the light source device 1, the illumination optical system 2, the image forming unit 3, and the projection optical system 4 described in the foregoing first embodiment. It should be noted that the illumination optical system 2 and the image forming unit 3 correspond to specific examples of the image generation optical system according to the present disclosure.

[0154] For example, the illumination optical system 2 includes a fly-eye lens 1210 (1210A and 1210B), a polarization conversion device 1220, a lens 1230, dichroic mirrors 1240A and 1240B, mirrors 1250A and 1250B, lenses 1260A and 1260B, a dichroic mirror 1270, and polarizing plates 1280A to 1280C starting from a position close to the light source device 1.

[0155] The fly-eye lens 1210 (1210A and 1210B) equalizes the illuminance distribution of white light from the lens 65 of the light source device 1. The polarization conversion device 1220 is used to direct the polarization axis of the incident light to a predetermined direction. For example, the polarization conversion device 1220 converts light other than P-polarized light into P-polarized light. The lens 1230 converges the light from the polarization conversion device 1220 toward the dichroic mirrors 1240A and 1240B. The dichroic mirrors 1240A and 1240B selectively reflect light within a predetermined wavelength range and selectively allow light within a wavelength range other than the predetermined wavelength range to pass through. For example, the dichroic mirror 1240A mainly reflects red light in the direction of the mirror 1250A. In addition, the dichroic mirror 1240B mainly reflects blue light in the direction of the mirror 1250B. Therefore, green light passes through the dichroic mirrors 1240A and 1240B and is guided to the reflective polarizing plate 1310C (described later) of the imaging unit 3. The mirror 1250A reflects the light from the dichroic mirror 1240A (mainly red light) toward the lens 1260A, and the mirror 1250B reflects the light from the dichroic mirror 1240B (mainly blue light) toward the lens 1260B. The lens 1260A allows the light from the mirror 1250A (mainly red light) to pass through and converges the light to the dichroic mirror 1270. The lens 1260B allows the light from the mirror 1250B (mainly blue light) to pass through and converges the light to the dichroic mirror 1270. The dichroic mirror 1270 selectively reflects green light and selectively allows light within a wavelength range other than green light to pass through. Here, the dichroic mirror 1270 allows the red light component of the light from the lens 1260A to pass through. In the case where the light from the lens 1260A includes a green light component, the dichroic mirror 1270 reflects the green light component toward the polarizing plate 1280C. The polarizing plates 1280A to 1280C include polarizers having a predetermined polarization axis. For example, in the case where conversion to P-polarized light is performed in the polarization conversion device 1220, the polarizing plates 1280A to 1280C allow P-polarized light to pass through and reflect S-polarized light.

[0156] The image forming unit 3 includes reflective polarizing plates 1310A to 1310C, reflective liquid crystal panels 1320A to 1320C, and a dichroic prism 1330.

[0157] The reflective polarizing plates 1310A to 1310C respectively allow light (e.g., P-polarized light) having a polarization axis identical to the polarization axis of the polarized light from the polarizing plates 1280A to 1280C to pass through, and reflect light having any other polarization axis (S-polarized light). Specifically, the reflective polarizing plate 1310A allows the P-polarized red light from the polarizing plate 1280A to be transmitted in the direction of the reflective liquid crystal panel 1320A. The reflective polarizing plate 1310B allows the P-polarized blue light from the polarizing plate 1280B to be transmitted in the direction of the reflective liquid crystal panel 1320C. The reflective polarizing plate 1310C allows the P-polarized green light from the polarizing plate 1280C to be transmitted in the direction of the reflective liquid crystal panel 1320C. In addition, the P-polarized green light that has passed through the dichroic mirrors 1240A and 1240B and entered the reflective polarizing plate 1310C passes through the reflective polarizing plate 1310C as it is and enters the dichroic prism 1330. In addition, the reflective polarizing plate 1310A reflects the S-polarized red light from the reflective liquid crystal panel 1320A, causing the S-polarized red light to enter the dichroic prism 1330. The reflective polarizing plate 1310B reflects the S-polarized blue light from the reflective liquid crystal panel 1320C, causing the S-polarized blue light to enter the dichroic prism 1330. The reflective polarizing plate 1310C reflects the S-polarized green light from the reflective liquid crystal panel 1320C, causing the S-polarized green light to enter the dichroic prism 1330.

[0158] The reflective liquid crystal panels 1320A to 1320C respectively perform spatial modulation of red light, blue light, and green light.

[0159] The dichroic prism 1330 synthesizes the incident red light, the incident blue light, and the incident green light, and outputs the synthesized light toward the projection optical system 4.

[0160] The projection optical system 4 includes, for example, a plurality of lenses (lenses L1410 to L1450) and a mirror M1400. The projection optical system 4 magnifies the light output from the image forming unit 3 and projects the magnified light onto the screen 1500 or the like.

[0161] (Operations of the light source device and the projector)

[0162] Next, with reference to Figure 6 and Figure 19 the operations of the projector 1000 including the light source device 1 are given.

[0163] First, the excitation light EL oscillates from the light source unit 1110 toward the PBS 1112. The excitation light EL is reflected by the PBS 1112, and then sequentially passes through the quarter-wave plate 1113 and the condenser optical system 1114 to be applied to the phosphor wheel 10A.

[0164] In the phosphor wheel 10A (e.g., phosphor wheel 10AA), some excitation light EL (e.g., blue light) is absorbed in the phosphor layer 12 and converted into light of a predetermined wavelength band (fluorescent light FL; e.g., yellow light). The fluorescent light FL emitted in the phosphor layer 12 diffuses together with some excitation light EL not absorbed by the phosphor layer 12 and is reflected to the side of the condenser optical system 1114. As a result, in the phosphor wheel 10A, the fluorescent light FL and some excitation light EL are multiplexed to generate white light, and the white light (multiplexed light Lw) is output toward the condenser optical system 1114.

[0165] Thereafter, the multiplexed light Lw passes through the condenser optical system 1114 and the quarter-wave plate 1113, is reflected by the PBS 1112, and enters the illumination optical system 2.

[0166] The multiplexed light Lw (white light) from the light source device 1 sequentially passes through the fly-eye lenses 1210 (1210A and 1210B), the polarization conversion device 1220, and the lens 1230, and then reaches the dichroic mirrors 1240A and 1240B.

[0167] Primarily, the red light R is reflected by the dichroic mirror 1240A, and the red light R sequentially passes through the mirror 1250A, the lens 1260A, the dichroic mirror 1270, the polarizing plate 1280A, and the reflective polarizing plate 1310A to reach the reflective liquid crystal panel 1320A. The red light R is spatially modulated in the reflective liquid crystal panel 1320A and then is reflected by the reflective polarizing plate 1310A and enters the dichroic prism 1330. It should be noted that in the case where the light reflected by the dichroic mirror 1240A to the mirror 1250A includes a green light component, the green light component is reflected by the dichroic mirror 1270 and passes through the polarizing plate 1280C and the reflective polarizing plate 1310C to reach the reflective liquid crystal panel 1320C. In the dichroic mirror 1240B, primarily the blue light B is reflected and enters the dichroic prism 1330 through a similar process. The green light G that has passed through the dichroic mirrors 1240A and 1240B also enters the dichroic prism 1330.

[0168] The red, blue, and green lights that enter the dichroic prism 1330 are combined into image light, and the image light is output to the projection optical system 4. The projection optical system 4 magnifies the image light from the image forming unit 3 and projects the magnified image light onto the screen 1500 or the like.

[0169] (Application Example 2)

[0170] Figure 20 is a schematic diagram of a configuration example of a transmissive 3LCD projection display device (projector 2000) that performs light modulation through a transmissive liquid crystal panel (LCD). The projector 2000 includes, for example, a light source device 1, an illumination optical system 6, an imaging unit 7, and a projection optical system 8.

[0171] The illumination optical system 6 includes, for example, an integrator device 1610, a polarization conversion device 1620, and a condenser lens 1630. The integrator device 1610 includes a first fly-eye lens 1610A and a second fly-eye lens 1610B. The first fly-eye lens 1610A includes a plurality of microlenses arranged two-dimensionally, and the second fly-eye lens 1610B includes a plurality of microlenses arranged in one-to-one correspondence with the microlenses of the first fly-eye lens 1610A.

[0172] The light (parallel light) incident on the integrator device 1610 from the light source device 1 is split into a plurality of light fluxes by the microlenses of the first fly-eye lens 1610A, and an image of each light flux is formed on a corresponding one of the microlenses of the second fly-eye lens 1610B. Each microlens of the second fly-eye lens 1610B serves as a secondary light source, and a plurality of parallel light beams having uniform brightness are applied to the polarization conversion device 1620 as incident light.

[0173] The function of the integrator device 1610 is to arrange the incident light applied from the light source device 1 to the polarization conversion device 1620 as a whole with a uniform brightness distribution.

[0174] The function of the polarization conversion device 1620 is to align the polarization state of the incident light incident thereon through the integrator device 1610 or the like. The polarization conversion device 1620 outputs output light including blue light B, green light G, and red light R, for example, through a lens or the like provided on the output side of the light source device 1.

[0175] The illumination optical system 6 further includes dichroic mirrors 1640A, 1640B, reflecting mirrors 1650A, 1650B, 1650C, relay lenses 1660A, 1660B, field lenses 1670A, 1670B, 1670C, liquid crystal panels 1710A, 1710B, and 1710C as the image forming unit 7, and a dichroic prism 1720.

[0176] The dichroic mirrors 1640A and 1640B have the property of selectively reflecting colored light within a predetermined wavelength range and allowing light within a wavelength range outside the predetermined wavelength range to pass through. For example, the dichroic mirror 1640A selectively reflects red light R. The dichroic mirror 1640B selectively reflects green light G among green light G and blue light B that have passed through the dichroic mirror 1640A. The remaining blue light B passes through the dichroic mirror 1640B. Therefore, the light (for example, white multiplexed light Lw) emitted from the light source device 1 is separated into a plurality of colored light beams having different colors.

[0177] The separated red light R is reflected by the mirror 1650A, becomes parallel light after passing through the field lens 1670A, and then enters the liquid crystal panel 1710A for red light modulation. The green light G becomes parallel light after passing through the field lens 1670B, and then enters the liquid crystal panel 1710B for green light modulation. The blue light B passes through the relay lens 1660A, is reflected by the mirror 1650B, then passes through the relay lens 1660B, and is reflected by the mirror 1650C. The blue light B reflected by the mirror 1650C becomes parallel light after passing through the field lens 1670C, and then enters the liquid crystal panel 1710C to modulate the blue light B.

[0178] The liquid crystal panels 1710A, 1710B, and 1710C are electrically coupled to a signal source (e.g., a PC, etc.) (not shown) that supplies an image signal including image information. The liquid crystal panels 1710A, 1710B, and 1710C modulate the incident light in each pixel based on the provided image signals of each color to generate a red image, a green image, and a blue image, respectively. The modulated light beams (the formed images) of each color enter the dichroic prism 1720 for synthesis. The dichroic prism 1720 superimposes the light beams of various colors incident from three directions on each other to synthesize a light beam, and outputs the synthesized light beam to the projection optical system 8.

[0179] The projection optical system 8 includes, for example, a plurality of lenses, etc. The projection optical system 8 magnifies the light output from the image forming unit 7 and projects the light onto the screen 1500.

[0180] Although the description has been given with reference to the first to third embodiments, modification examples 1 to 8, and application examples, the present disclosure is not limited to the foregoing embodiments, etc., and can be modified in various ways. For example, the materials, etc. of the respective components described in the foregoing embodiments, etc. are merely exemplary and not restrictive, and any other materials can be used.

[0181] In addition, although modification examples 1 to 7 are described as examples of combinations of the configurations of the respective components with the configuration of the third embodiment, the present disclosure is not limited thereto, and the respective components can be combined with the configuration of the first embodiment or the second embodiment. In addition, modification examples 1 to 7 can be combined with each other. For example, modification example 5 describes an example of using three separately formed heat dissipation members 53A, 53B, and 53C; however, for example, the three heat dissipation members 53A, 53B, and 53C can be integrally formed with the fins 532a, 532b, and 532c of modification example 1. In addition, modification example 7 describes the transmissive phosphor wheel 10H in which a plurality of heat dissipation members 93 are provided only on the back surface (surface 91S2) side of the wheel substrate 91; however, for example, a plurality of heat dissipation members can also be provided on the front surface (surface 91S1) side of the wheel substrate 91 as in modification example 6.

[0182] In addition, as a projection display device according to the present disclosure, a device other than the above-described projector can be configured. Further, the light source device according to the present disclosure can be used for a device other than the projection display device. For example, the light source device 1 according to the present disclosure can be used for illumination and is applicable to, for example, a light source for a headlight of an automobile or a light source for illumination.

[0183] It should be noted that the present technology may have the following configuration. According to the technology having the following configuration, the temperature of the phosphor layer can be reduced by the heat diffusion effect while suppressing an increase in weight. Therefore, the heat dissipation efficiency can be improved. It should be noted that the effects described herein are not necessarily restrictive, and any effects described in the present disclosure can be provided.

[0184] (1) A light source device, comprising:

[0185] a support substrate having a phosphor layer on one surface thereof;

[0186] a drive unit that rotationally drives the support substrate;

[0187] a first support member that is disposed face to face with the other surface of the support substrate opposite to the one surface;

[0188] a plurality of first heat dissipation members whose heat dissipation performance varies depending on the distance from the phosphor layer, the plurality of first heat dissipation members being concentrically provided on the other surface of the support substrate; and

[0189] a plurality of second heat dissipation members that are concentrically provided on the surface of the first support member facing the support substrate, the plurality of second heat dissipation members being alternately arranged with the plurality of first heat dissipation members. (2)

[0191] The light source device according to (1), wherein, among the plurality of first heat dissipation members, the heat dissipation performance of the first heat dissipation member near the phosphor layer is higher than that of the other first heat dissipation members. (3)

[0193] The light source device according to (2), wherein the thickness of the first heat dissipation member near the phosphor layer is greater than the thickness of the other first heat dissipation members. (4)

[0195] The light source device according to (2) or (3), wherein the thickness of the plurality of first heat dissipation members decreases as the distance from the phosphor layer increases. (5)

[0197] The light source device according to any one of (2) to (4), wherein the length of the first heat dissipation member near the phosphor layer is greater than the length of the other first heat dissipation members. (6)

[0199] The light source device according to any one of (2) to (5), wherein the height of the plurality of first heat dissipation members decreases as the distance from the phosphor layer increases. (7)

[0201] The light source device according to any one of (1) to (6), wherein the support substrate and the plurality of first heat dissipation members are separately formed. (8)

[0203] The light source device according to any one of (1) to (6), wherein the plurality of first heat dissipation members are integrally formed with the support substrate. (9)

[0205] The light source device according to any one of (1) to (8), wherein the plurality of first heat dissipation members are arranged to avoid the formation region of the phosphor layer. (10)

[0207] The light source device according to any one of (1) to (9), wherein

[0208] the phosphor layer has an annular shape, and

[0209] the light source device further includes:

[0210] one or more third heat dissipation members, the one or more third heat dissipation members being concentrically arranged with the phosphor layer on the one surface of the support substrate,

[0211] a second support member, the second support member being arranged face to face with the one surface of the support substrate, and

[0212] one or more fourth heat dissipation members, the one or more fourth heat dissipation members facing the one or more third heat dissipation members, the one or more fourth heat dissipation members being provided on the surface of the second support member facing the support substrate. (11)

[0214] The light source device according to (10), wherein, among the plurality of third heat dissipation members, the heat dissipation performance of the third heat dissipation member near the phosphor layer is higher than that of the other third heat dissipation members. (12)

[0216] The light source device according to (11), wherein the thickness of the third heat dissipation member near the phosphor layer is greater than the thickness of the other third heat dissipation members. (13)

[0218] The light source device according to (11) or (12), wherein the thicknesses of the plurality of third heat dissipation members decrease as the distance from the phosphor layer increases. (14)

[0220] The light source device according to any one of (11) to (13), wherein the length of the third heat dissipation member near the phosphor layer is greater than the length of the other third heat dissipation members. (15)

[0222] The light source device according to any one of (11) to (14), wherein the heights of the plurality of third heat dissipation members decrease as the distance from the phosphor layer increases. (16)

[0224] The light source device according to any one of (10) to (15), wherein the first support member and the second support member are included in a housing that houses a support substrate having the phosphor layer, the plurality of first heat dissipation members, and the one or more third heat dissipation members. (17)

[0226] The light source device according to (16), wherein the outside of the housing further has a heat dissipation structure. (18)

[0228] The light source device according to (16) or (17), wherein the housing has a sealing structure. (19)

[0230] The light source device according to any one of (16) to (18), wherein helium is further sealed in the housing.

[0231] (20) A projection display device, comprising:

[0232] A light source device;

[0233] An image generation optical system that generates image light by modulating light from the light source device based on an input image signal; and

[0234] A projection optical system that projects the image light generated by the image generation optical system,

[0235] The light source device includes:

[0236] A support substrate having a phosphor layer on one surface thereof;

[0237] A driving unit that rotationally drives the support substrate;

[0238] A first support member that is disposed facing another surface of the support substrate opposite to the one surface;

[0239] A plurality of first heat dissipation members having different heat dissipation performances according to the distance from the phosphor layer, and the plurality of first heat dissipation members are concentrically provided on the another surface of the support substrate; and

[0240] A plurality of second heat dissipation members that are concentrically provided on a surface of the first support member facing the support substrate, and the plurality of second heat dissipation members are alternately arranged with the plurality of first heat dissipation members.

[0241] This application claims the benefit of Japanese Priority Patent Application JP2019-108135, filed with the Japanese Patent Office on June 10, 2019, the entire contents of which are incorporated herein by reference.

[0242] Those skilled in the art should understand that various modifications, combinations, sub-combinations and alternatives may occur in accordance with design requirements and other factors, as long as they fall within the scope of the appended claims or their equivalents.

Claims

1. A light source device, comprising: a support substrate having a phosphor layer on one surface thereof; a driving unit that rotationally drives the support substrate; a first support member disposed face to face with the other surface of the support substrate opposite to the one surface; a plurality of first heat dissipation members, the heat dissipation performance of the plurality of first heat dissipation members decreasing as the distance from the phosphor layer increases, the plurality of first heat dissipation members being concentrically arranged on the other surface of the support substrate; and a plurality of second heat dissipation members, the plurality of second heat dissipation members being concentrically arranged on the surface of the first support member facing the support substrate, the plurality of second heat dissipation members being alternately arranged with the plurality of first heat dissipation members.

2. The light source device according to claim 1, wherein, The thickness of the plurality of first heat dissipation members decreases as the distance from the phosphor layer increases.

3. The light source device according to claim 1, wherein, The length of the plurality of first heat dissipation members decreases as the distance from the phosphor layer increases.

4. The light source device according to claim 1, wherein, The support substrate and the plurality of first heat dissipation members are separately formed.

5. The light source device according to claim 1, wherein, The plurality of first heat dissipation members are integrally formed with the support substrate.

6. The light source device according to claim 1, wherein, The plurality of first heat dissipation members are arranged to avoid the formation region of the phosphor layer.

7. The light source device according to claim 1, wherein the phosphor layer has an annular shape, and the light source device further comprises: one or more third heat dissipation members concentrically arranged with the phosphor layer on the one surface of the support substrate, a second support member disposed face to face with the one surface of the support substrate, and one or more fourth heat dissipation members facing the one or more third heat dissipation members, the one or more fourth heat dissipation members being disposed on the surface of the second support member facing the support substrate.

8. The light source device according to claim 7, wherein, Among the plurality of third heat dissipation members, the heat dissipation performance of the third heat dissipation member near the phosphor layer is higher than that of the other third heat dissipation members.

9. The light source device according to claim 8, wherein, The thickness of the third heat dissipation member near the phosphor layer is greater than the thickness of the other third heat dissipation members.

10. The light source device according to claim 8, wherein, The thickness of the plurality of third heat dissipation members decreases as the distance from the phosphor layer increases.

11. The light source device according to claim 8, wherein, The length of the third heat dissipation member near the phosphor layer is greater than the length of the other third heat dissipation members.

12. The light source device according to claim 8, wherein, The length of the plurality of third heat dissipation members decreases as the distance from the phosphor layer increases.

13. The light source device according to claim 7, wherein, The first support member and the second support member are included in a housing that houses the support substrate having the phosphor layer, the plurality of first heat dissipation members, and the one or more third heat dissipation members.

14. The light source device according to claim 13, wherein, The outside of the housing further has a heat dissipation structure.

15. The light source device according to claim 13, wherein, The housing has a sealing structure.

16. The light source device according to claim 13, wherein, Helium is further sealed in the housing.

17. A projection display device, comprising: a light source device; an image generation optical system that generates image light by modulating light from the light source device based on an input image signal; and A projection optical system that projects image light generated by the image generation optical system. The light source device includes: A support substrate having a phosphor layer on one surface; A driving unit that rotationally drives the support substrate; A first support member that is arranged face-to-face with the other surface of the support substrate opposite to the one surface; A plurality of first heat dissipation members whose heat dissipation performance decreases as the distance from the phosphor layer increases, and the plurality of first heat dissipation members are concentrically arranged on the other surface of the support substrate; and A plurality of second heat dissipation members that are concentrically arranged on the surface of the first support member facing the support substrate, and the plurality of second heat dissipation members are alternately arranged with the plurality of first heat dissipation members.

Images