Phosphor wheel device, illumination device, and projection-type image display apparatus

Abstract

To provide a phosphor wheel device capable of cooling the heat generated by a fluorescent body with higher efficiency than before with a simple configuration.SOLUTION: A phosphor wheel device 120 is formed of a heat conduction material that has the first optical reflectance. The phosphor wheel device 120 includes: a base plate 121 that has a first plane and a second plane opposite to each other; a fluorescent body 122 arranged on the first plane of the base plate 121; an adhesion layer adhering the base plate 121 and the fluorescent body 122; and a plurality of fins 123 arranged on the second plane of the base plate 121. The adhesion layer contains an adhesive 125 that has the first heat conductivity and filler particles 126. The filler particles 126 have the second heat conductivity higher than the first heat conductivity and the second optical reflectance higher than the first optical reflectance.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a phosphor wheel device used, for example, as a light source for a projection-type image display device, and to an illumination device and a projection-type image display device including such a phosphor wheel device. [Background technology]

[0002] Due to the advancement of solid-state light source technology, the light source of a projection type image display device is being replaced from the conventional discharge tube lamp to a solid-state light source such as a light-emitting diode or a semiconductor laser element. Light-emitting diodes and semiconductor laser elements have advantages such as a long life, no mercury, and no explosion. In particular, a semiconductor laser element has a small output power from a single element, but the etendue of the output light is relatively small. Therefore, a device in which a plurality of semiconductor laser elements are arranged in an array and integrated is also provided. By using such a semiconductor laser element or an array thereof, a high-power projection type image display device, for example, exceeding 5000 lumens, is provided.

[0003] Among the semiconductor laser elements, those that generate blue light are particularly superior in terms of efficiency and power. In order to obtain white light, the mainstream configuration of projection-type image display devices is one that combines a semiconductor laser element that generates blue light with a phosphor that produces yellow light from the blue light. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-118107 A [Patent Document 2] JP 2018-036457 A [Patent Document 3] International Publication No. 2016 / 185851 [Patent Document 4] JP 2017-116935 A Summary of the Invention [Problem to be solved by the invention]

[0005] It is required to increase the output power of a projection type image display device equipped with a solid-state light source. However, even with a relatively high-efficiency YAG phosphor, only about half of the energy of the light incident on the phosphor can be converted into fluorescence, and the remaining energy becomes heat. If this heat is not removed from the phosphor, the temperature of the phosphor rises, resulting in a decrease in the efficiency of the fluorescence conversion and reliability. In particular, when the light incident on the phosphor is focused in a point shape, the temperature of the phosphor rises significantly. Therefore, it is necessary to use the phosphor in combination with a cooling means. In general, the phosphor is formed in an annular shape on the surface of a disk-shaped substrate and rotated by a motor (such a configuration is referred to as a "phosphor wheel device" in this specification), thereby expanding the effective surface area of ​​the phosphor and promoting heat exchange with the air. In recent years, there is a demand for further high brightness of projection type image display devices, and a phosphor and its configuration for converting the incident light with high efficiency are required, and a cooling means that can be realized efficiently and inexpensively is also required.

[0006] In view of such problems, the inventions disclosed in Patent Documents 1 to 4, for example, have been proposed in the past.

[0007] Patent documents 1 and 2 disclose that the adhesive that bonds the phosphor to the substrate contains a thermally conductive filler, thereby improving cooling performance. In this case, heat is easily conducted from the phosphor to the substrate, but no means for cooling the substrate is disclosed.

[0008] Patent documents 3 and 4 disclose a configuration in which a means for improving cooling is provided on the back surface of a rotating substrate on which phosphors are formed. Patent document 3 discloses an overview of various configurations for increasing the surface area. Patent document 4 discloses forming a convex shape to increase the surface area.

[0009] Patent documents 1 and 2 consider heat conduction only in the vicinity of the phosphor, and are unable to sufficiently remove heat from the phosphor and its vicinity. Patent documents 3 and 4 describe various configurations for increasing the surface area, but there is a possibility that restrictions will be placed on the method of realizing this (construction method).

[0010] An object of the present disclosure is to provide a phosphor wheel device that can cool heat generated by a phosphor more efficiently than ever before with a simple configuration. [Means for solving the problem]

[0011] A phosphor wheel device according to one aspect of the present disclosure includes a substrate made of a thermally conductive material having a first optical reflectance and having first and second surfaces facing each other, a phosphor layer disposed on the first surface of the substrate, an adhesive layer that bonds the substrate and the phosphor layer to each other, and a plurality of fins disposed on the second surface of the substrate. The adhesive layer includes an adhesive having a first thermal conductivity and filler particles. The filler particles have a second thermal conductivity higher than the first thermal conductivity and a second optical reflectance higher than the first optical reflectance. Effect of the Invention

[0012] ADVANTAGEOUS EFFECT OF THE DISCLOSURE According to a phosphor wheel device according to an aspect of the present disclosure, heat generated by a phosphor can be cooled more efficiently than ever before with a simple configuration. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a configuration of an illumination device 100 including a phosphor wheel device 120 according to a first embodiment. [Diagram 2] 2 is a plan view showing the configuration of the front surface of phosphor wheel device 120 of FIG. [Diagram 3] 2 is a cross-sectional view showing a configuration in the vicinity of the outer periphery of phosphor wheel device 120 of FIG. [Figure 4] 2 is a perspective view showing a configuration of the front surface of phosphor wheel device 120 of FIG. 1. [Diagram 5]2 is a perspective view showing a configuration of the rear surface of phosphor wheel device 120 of FIG. 1. [Figure 6] 2 is a plan view showing the configuration of the rear surface of phosphor wheel device 120 of FIG. 1. FIG. [Figure 7] 2 is a side view showing the configuration of each fin 123 of phosphor wheel device 120 of FIG. [Figure 8] 10 is a cross-sectional view showing a configuration in the vicinity of the outer periphery of phosphor wheel device 120A according to a modified example of the first embodiment. [Figure 9] 1 is a schematic diagram showing a configuration of an illumination device 200 including a phosphor wheel device 120 according to a second embodiment. [Figure 10] 13 is a plan view showing the configuration of the front surface of phosphor wheel device 120B according to a modification of the second embodiment. FIG. [Figure 11] FIG. 11 is a schematic diagram showing the configuration of a projection-type image display device 300 according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

[0015] It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0016] [First embodiment] Hereinafter, a lighting device including a phosphor wheel device according to a first embodiment will be described with reference to FIGS.

[0017] [1-1. Overall composition] FIG. 1 is a schematic diagram showing the configuration of lighting device 100 including phosphor wheel device 120 according to a first embodiment. FIG. 2 is a plan view showing the configuration of the front side of phosphor wheel device 120 of FIG. 1. FIG. 3 is a cross-sectional view showing the configuration near the outer periphery of phosphor wheel device 120 of FIG. 1. FIG. 4 is a perspective view showing the configuration of the front side of phosphor wheel device 120 of FIG. 1. FIG. 5 is a perspective view showing the configuration of the rear side of phosphor wheel device 120 of FIG. 1.

[0018] 1, the illumination device 100 includes semiconductor laser elements 101a, 101b, and 101c, collimating lenses 102a, 102b, and 102c, lenses 103, 104, 107, 108, and 109, a diffusion plate 105, a dichroic mirror 106, a rod integrator 110, and a phosphor wheel device 120.

[0019] Semiconductor laser elements 101a-101c generate blue light for exciting phosphors in phosphor wheel device 120. The blue light emitted in the -Z direction from semiconductor laser elements 101a-101c is collimated by collimating lenses 102a-102c, and then focused by lenses 103 and 104 that constitute an afocal system, and enters diffusion plate 105. The blue light that enters diffusion plate 105 is diffused therein, and then enters dichroic mirror 106.

[0020] Dichroic mirror 106 has the property of transmitting blue light and reflecting other color component light, and is disposed at a 45 degree incline with respect to the optical axis. The blue light that is incident on dichroic mirror 106 from diffusion plate 105 and transmitted therethrough is incident on phosphor wheel device 120 via lenses 107 and 108.

[0021] 2 and 3, phosphor wheel device 120 includes substrate 121, phosphor 122, multiple fins 123, driving device 124, adhesive 125, and filler particles 126. In this specification, in phosphor wheel device 120, the surface onto which blue light from semiconductor laser elements 101a-101c is incident (the surface on the +Z side in FIG. 1, the surface shown in FIG. 2) is referred to as a "first surface" or "front surface," and the opposite surface (the surface on the -Z side in FIG. 1) is referred to as a "second surface" or "rear surface."

[0022] The substrate 121 is made of a thermally conductive material formed in a circular shape and has a front surface and a rear surface opposed to each other.

[0023] The phosphor 122 is formed in a plate-like and ring-like shape, and is disposed on the front surface of the substrate 121. The phosphor 122 is, for example, a fired ceramic. The phosphor 122 is fixed to the substrate 121 by an adhesive 125 mixed so that the filler particles 126 are diffused and distributed. Here, the phosphor 122 is fixed so as to be concentric around the rotation center O of the substrate 121. The phosphor 122 has a property of emitting yellow fluorescence when excited by, for example, blue light.

[0024] Each fin 123 is disposed on the rear surface of the substrate 121 over an area at least larger than the area over which the phosphor 122 is disposed on the front surface of the substrate 121. Each fin 123 is formed integrally with the substrate 121, for example.

[0025] The driving device 124 rotates the substrate 121 around the center of rotation O.

[0026] The substrate 121 has a first optical reflectance, the adhesive 125 has a first thermal conductivity, and the filler particles 126 have a second thermal conductivity higher than the first thermal conductivity and a second optical reflectance higher than the first optical reflectance.

[0027] In this specification, phosphor 122 is also referred to as a "phosphor layer," and adhesive 125 and filler particles 126 are also collectively referred to as an "adhesive layer."

[0028] 1 again, blue light arriving at phosphor wheel device 120 from semiconductor laser elements 101a-101c is incident on phosphor 122. Phosphor 122 is excited by the blue light and generates yellow fluorescence. The yellow fluorescence is reflected by filler particles 126 and travels in the +Z direction in FIG. 1. Since substrate 121 of phosphor wheel device 120 is rotated by drive device 124, the area of ​​the phosphor that is irradiated can be increased even when high-energy blue light is incident thereon, and therefore heat generation when fluorescence is generated can be suppressed.

[0029] The yellow light generated by phosphor wheel device 120 is incident on dichroic mirror 106 via lenses 107 and 108. As described above, dichroic mirror 106 has the property of transmitting blue light and reflecting other color component light, so the yellow light incident on dichroic mirror 106 is reflected therefrom and travels in the -X direction. The yellow light reflected by dichroic mirror 106 is collected via lens 109 onto the entrance surface of rod integrator 110, which has a rectangular opening and is placed in front of it.

[0030] In this way, yellow light can be generated from blue light by using phosphor wheel device 120. In the configuration of Fig. 1, the light emitted from the exit surface of rod integrator 110 is the output light of lighting device 100. A necessary optical system is provided after the exit surface of rod integrator 110 to perform its functions.

[0031] Instead of the lens 109 and the rod integrator 110, the illumination device 100 may include a lens array made up of a plurality of rectangular lenses.

[0032] [1-2. Configuration of phosphor wheel device] Next, a detailed configuration of phosphor wheel device 120 will be described.

[0033] As described above, the filler particles 126 have a thermal conductivity higher than that of the adhesive 125 and an optical reflectance higher than that of the substrate 121. The filler particles 126 are, for example, titanium oxide. On the other hand, the substrate 121 is, for example, an aluminum alloy in terms of thermal conductivity, availability, and ease of processing. Exemplary materials have, for example, the following thermal conductivities and optical reflectances.

[0034] Thermal Conductivity Adhesive 0.1W / m / K Titanium dioxide 6.3W / m / K light reflectance Aluminum alloy 80% Titanium dioxide 95%

[0035] The phosphor 122 excited by the blue light generates yellow fluorescence in all directions. Of this, the yellow fluorescence generated toward the substrate 121 (i.e., in the -Z direction) is reflected by the filler particles 126 (titanium oxide) before reaching the substrate 121, enters the phosphor 122 again, passes through the phosphor 122, and is emitted from the +Z side surface of the phosphor 122. This eliminates the need for a reflective layer that would be provided on the surface of the substrate in the conventional technology. A reflective layer formed by deposition or the like is very expensive. According to this embodiment, by eliminating the need for a reflective layer, it is possible to achieve performance equivalent to that of the conventional technology at a lower cost than the conventional technology.

[0036] Although the example using the filler particles 126 made of titanium oxide has been described here, any material having high thermal conductivity and high optical reflectance, such as zinc oxide, can be used. Zinc oxide has a thermal conductivity of 25.2 W / m / K and an optical reflectance of 90%.

[0037] FIG. 6 is a plan view showing the configuration of the rear surface of phosphor wheel device 120 of FIG. 1. Since the strength of substrate 121 differs significantly between a portion with fins 123 and a portion without fins 123, there is a concern that substrate 121 may bend. When substrate 121 is bent, the distance between lens 108 and phosphor 122 varies. When this distance varies, the efficiency of fluorescence conversion may decrease, and the intensity of fluorescence may vary depending on the angular position of substrate 121. In this embodiment, in order to make substrate 121 less likely to bend, as shown in FIG. 6, each fin 123 is formed rotationally symmetrically with respect to the rotation center O of substrate 121, and is formed so that any radius of substrate 121 intersects at least two fins 123. Each fin 123 may be formed in a straight line or a curved line, and may be formed along a part of a spiral line as shown in FIG. 6. As a result, each fin 123 having a predetermined height with respect to the surface of substrate 121 acts to suppress bending of substrate 121, and a configuration that is resistant to bending can be provided.

[0038] FIG. 7 is a side view showing the configuration of each fin 123 of phosphor wheel device 120 of FIG.

[0039] As described above, when phosphor 122 is made of ceramic and substrate 121 is made of an aluminum alloy, there is a concern that the difference in thermal expansion coefficient between them may cause cracks in phosphor 122. In particular, a temperature difference is likely to occur between the portion of the surface of substrate 121 where fins 123 are present (i.e., the portion that is easily cooled by fins 123) and the portion where fins 123 are not present (i.e., the portion that is not easily cooled by fins 123), and there is a concern that cracks may occur in the portion of phosphor 122 facing the portion where fins 123 are not present.

[0040] In this embodiment, each fin 123 is formed to have the dimensions shown in FIG. 7 at a position corresponding to the outer periphery of the phosphor 122. Here, d1 indicates the thickness of the substrate 121, d2 indicates the width (thickness) of each fin 123, and d3 indicates the distance between two adjacent fins 123. θ1 indicates the angle at which the width d2 of one fin 123 on the rear surface (-Z side surface) of the substrate 121 is seen from the front surface (+Z side surface) of the substrate 121. θ2 indicates the angle at which the distance d3 between two adjacent fins 123 on the rear surface of the substrate 121 is seen from the front surface of the substrate 121. At this time, each fin 123 is formed to satisfy θ1<55° and θ2<140°. By specifying the angle θ1, it is possible to make it difficult for the substrate 121 to expand in the portion where the fin 123 is present. Also, by specifying the angle θ2, it is possible to make it difficult for the substrate 121 to expand in the portion where the fin 123 is not present.

[0041] The present inventors have confirmed through experiments that even if phosphor 122 made of ceramic is fixed to substrate 121 made of an aluminum alloy, no cracks occur in phosphor 122 by satisfying the dimensional conditions described with reference to Fig. 7. In the experiments, A6063 was used as the aluminum alloy from the viewpoints of thermal conductivity and processability.

[0042] According to the phosphor wheel device 120 of this embodiment, filler particles 126 are mixed into the adhesive 125 that fixes the phosphor 122 to the substrate 121 so as to be diffused and distributed, and further, a plurality of fins 123 are provided on the rear surface of the substrate 121, so that the heat generated by the phosphor 122 can be cooled more efficiently than before with a simple configuration.

[0043] According to phosphor wheel device 120 of this embodiment, phosphor 122 is fixed directly to substrate 121 by adhesive 125 mixed with filler particles 126 having high thermal conductivity, so that phosphor 122 can be efficiently cooled. Therefore, it is possible to prevent a decrease in efficiency caused by thermal quenching caused by a rise in temperature of phosphor 122.

[0044] Phosphor wheel device 120 according to the present embodiment has a simple configuration and can be manufactured inexpensively. Phosphor wheel device 120 according to the present embodiment does not require a reflective layer and can be manufactured inexpensively.

[0045] According to phosphor wheel device 120 of this embodiment, even under conditions where the phosphor is excited by high-power incident light, it is possible to realize a phosphor wheel device that efficiently emits light and operates with high reliability.

[0046] [1-3. Modifications] Fig. 8 is a cross-sectional view showing a configuration in the vicinity of the outer periphery of phosphor wheel device 120A according to a modified example of the first embodiment. Phosphor wheel device 120A in Fig. 8 further includes reflective layer 127 formed on the front surface of substrate 121, in addition to the components of phosphor wheel device 120 in Fig. 3. Phosphor 122 is fixed to reflective layer 127 by adhesive 125 mixed with filler particles 126. Reflective layer 127 is, for example, a metal thin film. By including reflective layer 127, even when the fluorescence generated by phosphor 122 cannot be completely reflected by filler particles 126 alone, the fluorescence can be reliably reflected.

[0047] [1-4. Effects, etc.] The configurations and effects of the phosphor wheel device and lighting device according to the first embodiment are as follows.

[0048] Phosphor wheel device 120 according to the first embodiment includes substrate 121 made of a heat conductive material having a first light reflectance and having first and second surfaces facing each other, phosphor 122 arranged on the first surface of substrate 121, an adhesive layer that bonds substrate 121 and phosphor 122 to each other, and a plurality of fins 123 arranged on the second surface of substrate 121. The adhesive layer includes adhesive 125 having a first thermal conductivity and filler particles 126. Filler particles 126 have a second thermal conductivity higher than the first thermal conductivity, and a second light reflectance higher than the first light reflectance.

[0049] This makes it possible to cool the heat generated by the phosphor with a simple configuration and more efficiently than before.

[0050] According to phosphor wheel device 120 according to the first embodiment, phosphor 122 may be made of ceramic.

[0051] This makes it possible to provide a phosphor wheel device that is more reliable than a phosphor made of an organic material, for example.

[0052] According to phosphor wheel device 120 according to the first embodiment, filler particles 126 may be made of titanium oxide.

[0053] This allows the phosphor wheel device to be cooled sufficiently and allows the fluorescent light to be reflected with high efficiency.

[0054] Phosphor wheel device 120 according to the first embodiment may further include a reflective layer formed between substrate 121 and the adhesive layer.

[0055] This allows the fluorescent light to be reflected with even higher efficiency.

[0056] According to phosphor wheel device 120 according to the first embodiment, substrate 121 may have a circular shape, and phosphor 122 may have a ring shape. The phosphor wheel device may further include a driving device 124 that rotates substrate 121.

[0057] This makes it possible to increase the area of ​​the phosphor that is irradiated even when high-energy blue light is incident, and therefore makes it possible to suppress heat generation when generating fluorescence.

[0058] According to phosphor wheel device 120 of the first embodiment, each fin 123 is formed rotationally symmetrically with respect to the center of rotation O of substrate 121, and may be formed so that any radius of substrate 121 intersects with at least two fins 123.

[0059] This can make it possible to make the substrate less prone to bending.

[0060] According to phosphor wheel device 120 according to the first embodiment, each fin 123 may be formed along a portion of the spiral line.

[0061] This can make it possible to make the substrate less prone to bending.

[0062] According to the phosphor wheel device 120 of the first embodiment, each fin 123 may be formed at a position corresponding to the outer periphery of phosphor 122 so that θ1<55° and θ2<140° are satisfied, where θ1 is the angle projected from the first surface to the second surface to the width of one fin 123, and θ2 is the angle projected from the first surface to the second surface to the distance between two adjacent fins 123.

[0063] As a result, even if the substrate actually receives heat from the phosphor, distortion caused by differences in thermal expansion on the substrate surface can be suppressed, and the phosphor bonded to the substrate can be supported without cracking.

[0064] Illumination device 100 according to the first embodiment includes semiconductor laser elements 101a to 101c and phosphor wheel device 120 or 120A.

[0065] This makes it possible to cool the heat generated by the phosphor more efficiently than ever before with a simple configuration, and to generate yellow light from blue light.

[0066] [Second embodiment] Hereinafter, a lighting device including a phosphor wheel device according to the second embodiment will be described with reference to FIGS.

[0067] [2-1. Configuration] Fig. 9 is a schematic diagram showing the configuration of lighting device 200 including phosphor wheel device 120 according to the second embodiment. In addition to the components of lighting device 100 in Fig. 1, lighting device 200 in Fig. 9 includes semiconductor laser elements 201a and 201b, collimating lenses 202a and 202b, lenses 203 and 205, and diffusion plate 204, thereby generating output light including blue color component light.

[0068] The semiconductor laser elements 201a and 201b generate blue color component light contained in the output light. The blue light emitted from the semiconductor laser elements 201a and 201b in the -X direction is collimated by the collimating lenses 202a and 202b, and then focused by the lens 203 and enters the diffusion plate 204. The blue light that enters the diffusion plate 204 is diffused therein, and then converted into approximately parallel light by the lens 205 and enters the dichroic mirror 106. As described above, the dichroic mirror 106 has the property of transmitting blue light and reflecting other color component lights, so that the blue light that enters the dichroic mirror 106 passes through it and proceeds in the -X direction. As a result, the blue light from semiconductor laser elements 201a and 201b is combined with the yellow light generated by phosphor 122 and reflected by dichroic mirror 106 to become white light, and the white light is focused on the incident surface of rod integrator 110 via lens 109.

[0069] In this manner, by using semiconductor laser elements 101a to 101c, 201a, and 201b that generate blue light and phosphor wheel device 120 that generates yellow fluorescent light, white light can be generated from blue light.

[0070] [2-2. Modifications] Fig. 10 is a plan view showing a configuration of the front side of phosphor wheel device 120B according to a modification of Embodiment 2. Illumination device 200 of Fig. 9 may include phosphor wheel device 120B of Fig. 10 instead of phosphor wheel device 120.

[0071] Phosphor wheel device 120B includes phosphors 122a and 122b and non-fluorescent region 122c instead of phosphor 122 in FIG. 2. Phosphor 122a has a property of being excited by blue light to generate green fluorescence. Phosphor 122b has a property of being excited by blue light to generate red fluorescence. Phosphors 122a and 122b are formed in a plate shape and disposed on the front surface of substrate 121. Phosphors 122a and 122b are formed on a predetermined circumference around rotation center O of substrate 121, over a predetermined angular range, and adjacent to each other. Phosphors 122a and 122b are, for example, baked ceramic. Phosphors 122a and 122b are fixed to substrate 121 by adhesive mixed with filler particles, similar to phosphor 122 in FIG. 3. In non-fluorescent region 122c, no phosphor, adhesive, or filler particles are disposed, and the surface of substrate 121 is exposed.

[0072] In lighting device 200 equipped with phosphor wheel device 120B in Fig. 10, the green fluorescence and the red fluorescence are reflected by the filler particles and travel in the +Z direction in Fig. 1. As described above, dichroic mirror 106 has the property of transmitting blue light and reflecting other color component lights, so that the green and red lights incident on dichroic mirror 106 are reflected by it and travel in the -X direction. As a result, the green and red lights generated by phosphors 122a and 122b and reflected by dichroic mirror 106 are combined with the blue light from semiconductor laser elements 201a and 201b to become white light, and are collected on the entrance surface of rod integrator 110 via lens 109.

[0073] When phosphor wheel device 120B rotates so that phosphors 122a and 122b are in an angular position where they can receive blue light from semiconductor laser elements 101a to 101c, semiconductor laser elements 101a to 101c are turned on, and semiconductor laser elements 201a and 201b are turned off at the same time. At this time, phosphors 122a and 122b are excited by the blue light in sequence and generate green light and red light in sequence. On the other hand, when phosphor wheel device 120B rotates so that non-fluorescent region 122c is in an angular position where it can receive blue light from semiconductor laser elements 101a to 101c, semiconductor laser elements 101a to 101c are turned off, and semiconductor laser elements 201a and 201b are turned on at the same time. As a result, lighting device 200 generates green light, red light, and blue light in sequence in a time-division manner and outputs them from the emission surface of rod integrator 110.

[0074] In this manner, by using semiconductor laser elements 101a-101c, 201a, and 201b that generate blue light, and phosphor wheel device 120B that generates fluorescent green and red light, white light can be generated from blue light.

[0075] Phosphor wheel device 120B may further include a reflective layer 127, similar to phosphor wheel device 120A of FIG.

[0076] [2-3. Effects, etc.] The configuration and effects of the lighting device according to the second embodiment are as follows.

[0077] Illumination device 200 according to the second embodiment includes semiconductor laser elements 101a to 101c, 201a, and 201b, and phosphor wheel device 120 or 120B.

[0078] This makes it possible to cool the heat generated by the phosphor more efficiently than ever before with a simple configuration, and to generate white light from blue light.

[0079] [Third embodiment] Hereinafter, a projection type image display device according to a third embodiment will be described with reference to FIG.

[0080] [3-1. Configuration] Fig. 11 is a schematic diagram showing the configuration of a projection-type image display device 300 according to a third embodiment. The projection-type image display device 300 includes the illumination device 200 of Fig. 9, a light modulation element which is a digital micromirror device (DMD), an optical system, and a housing that houses them. The third embodiment incorporates a dustproof structure for dust prevention into the illumination device 200 according to the second embodiment.

[0081] The projection type image display device 300 includes dustproof housings 301 and 302, a housing 303, heat sinks 304a and 304b, fans 305a and 305b, lenses 306 and 307, mirrors 308 and 309, a DMD 310, a projection lens 311, and the lighting device 200.

[0082] Dustproof housing 301 hermetically houses optical components such as a semiconductor laser element and a lens. Dustproof housing 302 houses phosphor wheel device 120. Housing 303 houses dustproof housing 302, as well as heat sinks 304a, 304b and fans 305a, 305b for cooling it. In particular, the area around phosphor wheel device 120 generates a lot of heat, so it is separated from other parts and the temperature difference with the outside air, which serves as a refrigerant, is increased to improve the efficiency of heat exchange.

[0083] Dust-proof housing 302 that houses phosphor wheel device 120 and its surrounding structure will be described below.

[0084] Heat sinks 304a and 304b having a plurality of fins on the inside and outside of dustproof housing 302 are provided on the side of dustproof housing 302 as heat exchange elements. Phosphor wheel device 120 is placed inside dustproof housing 302 so as to rotate about a rotation axis along the Z axis. When substrate 121 of phosphor wheel device 120 is rotated by driving device 124, a plurality of fins 123 rotate together with substrate 121, and an airflow is generated inside dustproof housing 302 by fins 123. The inner fins of heat sinks 304a and 304b are arranged so that the airflow generated by fins 123 of phosphor wheel device 120 flows along the surfaces thereof.

[0085] Fans 305a and 305b are provided near the sides of dustproof housing 302, respectively, and send cooling air to heat sinks 304a and 304b. This improves the efficiency of heat exchange by heat sinks 304a and 304b. In this manner, the air inside the housing warmed by heat generated when phosphor 122 of phosphor wheel device 120 is irradiated with blue light generated by the semiconductor laser element flows along the surfaces of heat sinks 304a and 304b by fins 123 of phosphor wheel device 120, and the heat is efficiently dissipated to the outside of housing 303 by heat sinks 304a and 304b and fans 305a and 305b.

[0086] The light emitted from rod integrator 110 passes through lenses 306 and 307, and is then reflected by mirrors 308 and 309 to enter light modulation element 310. Light modulation element 310 spatially modulates the incident light from illumination device 200 in response to a video signal from outside projection-type image display device 300 to generate image light. The image light generated by light modulation element 310 is emitted in the +Z direction, enlarged by projection lens 311, and projected onto a screen (not shown).

[0087] [3-2. Effects, etc.] The configuration and effects of the projection-type image display device according to the third embodiment are as follows.

[0088] The projection type image display device according to the third embodiment includes an illumination device 200, a light modulation element 310 that spatially modulates incident light from the illumination device 200 in response to an image signal to generate image light, and a projection optical system 313 that projects the image light.

[0089] This makes it possible to cool the heat generated by the phosphor with a simple configuration more efficiently than before, and therefore makes it possible to generate and project high-power image light.

[0090] [Other embodiments] As described above, several embodiments have been described as examples of the technology of the present disclosure. However, the technology of the present disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are performed. In addition, it is also possible to combine the components described in the above embodiments to create new embodiments. [Industrial Applicability]

[0091] The present disclosure is applicable to a phosphor wheel device for a lighting device or a projection-type image display device, and is also applicable to a lighting device or a projection-type image display device including such a phosphor wheel device. [Explanation of symbols]

[0092] 100,200…Lighting equipment, 101a, 101b, 101c, 201a, 201b...semiconductor laser elements, 102a, 102b, 102c, 202a, 202b...Collimating lenses, 103, 104, 107, 108, 109, 203, 205, 306, 307... Lenses, 105, 204…Diffusion plate, 106…Dichroic mirror, 110…Rod integrator, 120, 120A, 120B...phosphor wheel device, 121...substrate, 122, 122a, 122b...phosphor, 122c…non-fluorescent area, 123…Finn, 124...Drive unit, 125…adhesive, 126...filler particles, 127...reflection layer, 300...Projection type image display device, 301, 302: Dustproof housing, 303…Housing, 304a, 304b...heat sink, 305a, 305b… Fans, 308,309…Mirror, 310...light modulation element, 311...Projection lens.

Claims

1. a substrate having first and second opposing surfaces, the substrate being made of a thermally conductive material having a first optical reflectivity; a phosphor layer disposed on a first surface of the substrate; an adhesive layer that bonds the substrate and the phosphor layer to each other; a plurality of fins disposed on a second surface of the substrate; the adhesive layer includes an adhesive having a first thermal conductivity and filler particles; the filler particles have a second thermal conductivity higher than the first thermal conductivity and a second optical reflectance higher than the first optical reflectance; Phosphor wheel device.

2. The phosphor layer is made of ceramic. The phosphor wheel device according to claim 1 .

3. The filler particles are made of titanium oxide.

3. The phosphor wheel device according to claim 1 or 2.

4. Further comprising a reflective layer formed between the substrate and the adhesive layer. The phosphor wheel device according to claim 1 .

5. The substrate has a circular shape; The phosphor layer has a ring shape, The phosphor wheel device further includes a drive device that rotates the substrate. The phosphor wheel device according to claim 1 .

6. Each of the fins is formed rotationally symmetrically with respect to the center of rotation of the substrate, and any radius of the substrate is formed so as to intersect with at least two fins. The phosphor wheel device of claim 5 .

7. Each of the fins is formed along a portion of the spiral line. The phosphor wheel device of claim 6.

8. When an angle obtained by projecting the width of one fin on the second surface from the first surface at a position corresponding to the outer periphery of the phosphor layer is θ1, and an angle obtained by projecting the distance between two adjacent fins on the second surface from the first surface is θ2, θ1<55° and θ2<140° was formed to satisfy The phosphor wheel device according to claim 6 or 7.

9. A light source element; A phosphor wheel device according to any one of claims 1 to 8, Lighting equipment.

10. The lighting device according to claim 9 ; a light modulation element that spatially modulates the incident light from the illumination device in response to a video signal to generate video light; and a projection optical system that projects the image light. Projection type image display device.

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