Phosphor wheel, light source device, projection image display device, and method for manufacturing phosphor wheel

Abstract

A phosphor wheel is provided with: a rotatable substrate; a plurality of wavelength conversion layers disposed on the substrate; and an adhesive layer provided between the substrate and the plurality of wavelength conversion layers. At least a first wavelength conversion layer among the plurality of wavelength conversion layers is a sintered type wavelength conversion layer comprising a sintered body of first wavelength conversion particles that wavelength-convert excitation light to light of a first wavelength. At least a second wavelength conversion layer among the plurality of wavelength conversion layers is a mixed layer type wavelength conversion layer that is a mixed layer of a support and second wavelength conversion particles filled in the support, and the second wavelength conversion particles wavelength-convert the excitation light to light of a second wavelength different from the first wavelength.

Description

Technical Field

[0001] The present disclosure relates to, for example, a phosphor wheel used in a light source device of a projection type image display device, a light source device, a projection type image display device, and a method for manufacturing the phosphor wheel. Background Art

[0002] Phosphor wheels using conventional phosphor layers (wavelength conversion layers) use a method consisting of a so-called mixed layer type wavelength conversion layer in which phosphor particles are dispersed in a resin paste and then applied, and a method consisting of a sintered body type wavelength conversion layer consisting of a sintered body containing phosphor particles.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. WO2018 / 042949 Summary of the invention

[0006] In the phosphor wheel using the former hybrid layer type wavelength conversion layer, more fluorescent wavelengths can be selected, which is excellent in cost, but there are problems in conversion efficiency and heat resistance. On the other hand, in the phosphor wheel using the sintered body type wavelength conversion layer, the conversion efficiency and heat resistance are excellent, but the cost is a problem.

[0007] An object of the present disclosure is to provide a phosphor wheel having an excellent balance between conversion efficiency and heat resistance and cost.

[0008] The phosphor wheel involved in the present disclosure comprises: a rotatable substrate; a plurality of wavelength conversion layers arranged on the substrate; and an adhesive layer provided between the substrate and the plurality of wavelength conversion layers. At least the first wavelength conversion layer among the plurality of wavelength conversion layers is a sintered body type wavelength conversion layer, which is composed of a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength. At least the second wavelength conversion layer among the plurality of wavelength conversion layers is a mixed layer type wavelength conversion layer, which is a mixed layer of a support body and second wavelength conversion particles filled in the support body, and the second wavelength conversion particles convert the wavelength of excitation light into light of a second wavelength different from the first wavelength.

[0009] The manufacturing method of the phosphor wheel involved in the present disclosure includes: a step of applying an adhesive layer to a substrate; a step of attaching a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength on the substrate; a step of curing the adhesive layer to form a sintered body type wavelength conversion layer; a step of coating a mixed layer of second wavelength conversion particles and a support body on the substrate on the same circumference as the sintered body type wavelength conversion layer, the second wavelength conversion particles converting the wavelength of excitation light into light of a second wavelength different from the first wavelength; and a step of curing the mixed layer to form a mixed layer type wavelength conversion layer.

[0010] According to the phosphor wheel of the present disclosure, the sintered body type wavelength conversion layer and the mixed layer type wavelength conversion layer are provided, thereby achieving a balance between conversion efficiency and heat resistance and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic plan view showing a planar structure of the fluorescent substance wheel according to the first embodiment.

[0012] Figure 2 1 is a flowchart showing a method for manufacturing the fluorescent substance wheel according to the first embodiment.

[0013] Figure 3 Yes means Figure 2 A flow chart of a method for manufacturing a phosphor wheel, wherein: Figure 3 (a) is a plan view showing details of a step of aligning a sintered body type wavelength conversion layer including a sintered body of wavelength conversion particles on a substrate, Figure 3 (b) is Figure 3 (a) the main view, Figure 3 (c) is a plan view showing the sintered body type wavelength conversion layer through the substrate.

[0014] Figure 4 It is shown in Figure 3 A top view showing the positional relationship between a guide pin provided adjacent to a sintered body type wavelength conversion layer and a bonding position of the substrate in a step of aligning and bonding a sintered body type wavelength conversion layer to the substrate.

[0015] Figure 5 It is shown in Figure 3 A front view of a direction in which the sintered body type wavelength conversion layer is attached to the substrate in a step of aligning and attaching the sintered body type wavelength conversion layer to the substrate.

[0016] Figure 6 This is a diagram showing a structure of a light source device using the fluorescent substance wheel according to the first embodiment.

[0017] Figure 7This is a diagram showing the structure of a projection type image display device equipped with a light source device using the fluorescent substance wheel according to the first embodiment.

[0018] Figure 8 This is a schematic plan view showing a planar structure of a fluorescent substance wheel according to the second embodiment.

[0019] Fig. 9 This is a diagram showing a structure of a light source device using the fluorescent substance wheel according to the second embodiment.

[0020] Fig.10 This is a diagram showing the structure of a projection type image display device equipped with a light source device using the fluorescent substance wheel according to the second embodiment.

[0021] Fig.11 This is a schematic plan view showing a planar structure of a fluorescent substance wheel according to the third embodiment.

[0022] Fig.12 This is a diagram for explaining the positional alignment of a sintered body type wavelength conversion layer (the center angle is smaller than the designed value) during the manufacture of the phosphor wheel according to the third embodiment.

[0023] Fig.13 This is a diagram for explaining the positional alignment of a sintered body type wavelength conversion layer (the center angle is larger than the design value) during the manufacture of the phosphor wheel according to the third embodiment. DETAILED DESCRIPTION

[0024] The phosphor wheel involved in the first embodiment comprises: a rotatable substrate; a plurality of wavelength conversion layers arranged on the substrate; and an adhesive layer provided between the substrate and the plurality of wavelength conversion layers. At least the first wavelength conversion layer among the plurality of wavelength conversion layers is a sintered body type wavelength conversion layer, which is composed of a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength. At least the second wavelength conversion layer among the plurality of wavelength conversion layers is a mixed layer type wavelength conversion layer, which is a mixed layer of a support body and second wavelength conversion particles filled in the support body, and the second wavelength conversion particles convert the wavelength of excitation light into light of a second wavelength different from the first wavelength.

[0025] In the phosphor wheel according to a second aspect, in the first aspect, the mixed layer type wavelength conversion layer and the sintered body type wavelength conversion layer may be disposed adjacent to each other on the substrate.

[0026] In the phosphor wheel according to the third aspect, in the first aspect or the second aspect, the first wavelength conversion layer and the second wavelength conversion layer may have at least one of an inner diameter or an outer diameter different from each other from the rotation center of the substrate.

[0027] In the phosphor wheel according to a fourth aspect, in any one of the first to third aspects, the first wavelength conversion layer and the second wavelength conversion layer may have different widths in a radial direction with respect to the rotation center.

[0028] In the phosphor wheel involved in the fifth embodiment, in any of the above-mentioned embodiments 1 to 4, the inner diameter of the first wavelength conversion layer from the rotation center of the substrate may be larger than the inner diameter of the second wavelength conversion layer from the rotation center of the substrate, and the outer diameter of the first wavelength conversion layer from the rotation center of the substrate may be smaller than the outer diameter of the second wavelength conversion layer from the rotation center of the substrate.

[0029] In any one of the first to fifth aspects, the phosphor wheel according to a sixth aspect may have openings on the same circumference with respect to the rotation center of the substrate on which the plurality of wavelength conversion layers are arranged.

[0030] In the phosphor wheel according to the seventh aspect, in any one of the first to fifth aspects, the phosphor wheel may have the reflective region on the same circumference with respect to the rotation center of the substrate on which the plurality of wavelength conversion layers are arranged.

[0031] A light source device according to an eighth aspect includes the fluorescent substance wheel according to any one of the first to seventh aspects.

[0032] A projection type image display device according to a ninth aspect includes the light source device according to the eighth aspect.

[0033] The manufacturing method of the phosphor wheel involved in the tenth embodiment includes: a step of applying an adhesive layer to a substrate; a step of attaching a sintered body type wavelength conversion layer including a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength on the substrate; a step of curing the adhesive layer to fix the sintered body type wavelength conversion layer; a step of applying a mixed layer mixed with second wavelength conversion particles and a support body on the substrate on the same circumference as the sintered body type wavelength conversion layer, the second wavelength conversion particles converting the wavelength of excitation light into light of a second wavelength different from the first wavelength; and a step of curing the mixed layer to form a mixed layer type wavelength conversion layer.

[0034] The manufacturing method of the phosphor wheel involved in the 11th embodiment may be, in the above-mentioned 10th embodiment, that in the step of forming a sintered body type wavelength conversion layer, guide pins for position alignment are provided around the sintered body of the first wavelength conversion particle, the substrate and the sintered body of the first wavelength conversion particle are relatively moved along the guide pins in a direction perpendicular to the bonding surface, and the sintered body of the first wavelength conversion particle is attached to the portion of the substrate coated with the bonding layer.

[0035] The manufacturing method of the phosphor wheel involved in the twelfth embodiment may be, in the above-mentioned eleventh embodiment, that in the step of forming a mixed layer type wavelength conversion layer, excluding the portion corresponding to the guide pin, a mixed layer mixed with the second wavelength conversion particles and the support body is applied on the substrate at a portion adjacent to the sintered body of the first wavelength conversion particles.

[0036] Hereinafter, the embodiments are described in detail with reference to the accompanying drawings as appropriate. However, unnecessary detailed descriptions are sometimes omitted. For example, detailed descriptions of known matters and repeated descriptions of substantially the same structures are sometimes omitted. This is to avoid the following description from becoming unnecessarily lengthy and to make it easy for those skilled in the art to understand. In addition, in the accompanying drawings, substantially the same components are given the same symbols.

[0037] In addition, the 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 scope of the claims.

[0038] (Implementation method 1)

[0039] [1-1 Structure of phosphor wheel]

[0040] Hereinafter, the structure of the fluorescent substance wheel 2 according to the first embodiment will be described in detail. Figure 1 2 is a schematic top view showing the planar structure of the fluorescent wheel 2 according to the first embodiment. Figure 1 As shown, the phosphor wheel 2 according to the first embodiment includes: a rotatable substrate 201, a plurality of wavelength conversion layers 204a, 204b, 205a, 205b, and an adhesive layer 202 (reflection layer) provided between the substrate 201 and the plurality of wavelength conversion layers 204a, 204b, 205a, 205b. The plurality of wavelength conversion layers 204a, 204b, 205a, 205b are arranged on the substrate 201, and convert the same excitation light wavelength into light of a plurality of different wavelengths. In addition, the plurality of wavelength conversion layers 204a, 204b, 205a, 205b include sintered body type wavelength conversion layers 204a, 204b and mixed layer type wavelength conversion layers 205a, 205b. The sintered body type wavelength conversion layers 204a, 204b are composed of a sintered body of first wavelength conversion particles that convert the wavelength of the excitation light into light of a first wavelength. The mixed layer type wavelength conversion layers 205 a and 205 b are mixed layers of a support and second wavelength conversion particles filled in the support, and the second wavelength conversion particles convert the wavelength of excitation light into light of a second wavelength.

[0041] According to the phosphor wheel 2 , since it includes the sintered body type wavelength conversion layers 204 a and 204 b and the mixed layer type wavelength conversion layers 205 a and 205 b , it is excellent in the balance between conversion efficiency and heat resistance and cost.

[0042] Hereinafter, each component constituting the phosphor wheel 2 will be described.

[0043] <Substrate>

[0044] The substrate 201 can be, for example, a substrate made of aluminum with excellent heat dissipation. In addition, the substrate 201 is not limited to aluminum and can also be other metals. Alternatively, it can be a transmissive substrate such as glass or sapphire. Additionally, it can be a component having a reflective region provided on a transmissive substrate such as glass or sapphire. A motor mounting hole 208 for mounting a motor is provided in the substrate 201, and the motor is used to rotate the substrate 201. Alternatively, it can also be mounted on the motor by a method other than through the motor mounting hole 208.

[0045] <Wavelength conversion layer>

[0046] The wavelength conversion layer includes sintered body type wavelength conversion layers 204a and 204b and hybrid layer type wavelength conversion layers 205a and 205b. These wavelength conversion layers 204a, 204b, 205a, and 205b are arranged on the substrate 201 on the same circumference starting from the rotation center of the substrate 201. Additionally, openings 206a and 206b can also be provided on the same circumference. Alternatively, as shown in Embodiment 2 described later, a reflective region can be provided instead of the openings. The sintered body type wavelength conversion layers 204a and 204b and the hybrid layer type wavelength conversion layers 205a and 205b can be adjacent to each other on the same circumference, or can be adjacent to each other with the openings 206a and 206b in between. Furthermore, since the temperature rises when the sintered body type wavelength conversion layers 204a and 204b and the hybrid layer type wavelength conversion layers 205a and 205b overlap, they can also be adjacent with a slight gap therebetween.

[0047] The inner diameters r1, R1 and outer diameters r2, R2 starting from the rotation center of the substrate of the hybrid layer type wavelength conversion layers 205a and 205b and the sintered body type wavelength conversion layers 204a and 204b can also be different in at least one of them. For example, in the Figure 1 example shown, the inner diameter R1 of the sintered body type wavelength conversion layers 204a and 204b is smaller than the inner diameter r1 of the hybrid layer type wavelength conversion layers 205a and 205b (R1 < r1), and the outer diameter R2 of the sintered body type wavelength conversion layers 204a and 204b is larger than the outer diameter r2 of the hybrid layer type wavelength conversion layers 205a and 205b (R2 > r2).

[0048] In addition, the widths in the radial direction starting from the rotation center of the substrate 201 of the hybrid layer type wavelength conversion layers 205a and 205b and the sintered body type wavelength conversion layers 204a and 204b can also be different. For example, in the Figure 1In the example shown, the radial width (r2-r1) of the mixed layer type wavelength conversion layers 205a and 205b is narrower than the radial width (R2-R1) of the sintered body type wavelength conversion layers 204a and 204b, and (r2-r1)<(R2-R1).

[0049] By setting any of the above conditions, at least one set of the radial positions (r1, r2, R1, R2) of the mixed layer type wavelength conversion layers 205a, 205b and the sintered body type wavelength conversion layers 204a, 204b can be made different. As a result, at the time of manufacturing the phosphor wheel, the guide pins provided around the sintered body of the first wavelength conversion particles can be arranged offset in the radial direction from the position where the mixed layer type wavelength conversion layer is provided. For this reason, the position alignment of the sintered body type wavelength conversion layers 204a, 204b when bonding to the substrate becomes easy.

[0050] <Sintered Wavelength Conversion Layer>

[0051] The sintered body type wavelength conversion layers 204 a and 204 b are composed of a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength.

[0052] <First Wavelength Converting Particle>

[0053] The first wavelength conversion particle is a so-called fluorescent particle, and may be a particle of a garnet structure, for example. The chemical formula of the garnet structure may be, for example, Y3Al5O which converts the wavelength of blue excitation light into yellow fluorescence. 12 , or it can be Lu3Al5O which converts the blue excitation light wavelength into green fluorescence 12 Alternatively, it can be a mixture of (Y, Lu)3Al5O 12 The activator may be, for example, Ce or Gd. Alternatively, it may be a particle that converts blue excitation light into fluorescence other than the aforementioned yellow or green.

[0054] <Hybrid-Layer Type Wavelength Conversion Layer>

[0055] The mixed layer type wavelength conversion layers 205 a and 205 b are mixed layers of a support and second wavelength conversion particles filled in the support, and the second wavelength conversion particles convert the wavelength of excitation light into light of a second wavelength.

[0056] <Second Wavelength Converting Particles>

[0057] The second wavelength conversion particle is a so-called phosphor particle, and may be a particle of a garnet structure like the first wavelength conversion particle. The chemical formula of the garnet structure may be, for example, Y3Al5O which converts the wavelength of blue excitation light into yellow fluorescence. 12, or it can be Lu3Al5O which converts the blue excitation light wavelength into green fluorescence 12 Alternatively, it can be a mixture of (Y, Lu)3Al5O 12 The activator may be, for example, Ce or Gd. In addition, it may be a particle that converts the blue excitation light into fluorescence other than the aforementioned yellow or green. By changing the structure, composition, etc., the first wavelength and the second wavelength for wavelength conversion in the first wavelength conversion particle and the second wavelength conversion particle can be changed in various ways.

[0058] <Support>

[0059] The support is a medium in which the second wavelength conversion particles are dispersed, and may be, for example, a heat-resistant transparent resin such as silicone and silsesquioxane, or a glass such as silicon dioxide and silicate glass.

[0060] <Adhesive layer>

[0061] The bonding layer 202 is provided between the substrate 201 and the sintered body type wavelength conversion layers 204a, 204b and the mixed layer type wavelength conversion layers 205a, 205b. The bonding layer 202 is provided to bond the sintered body type wavelength conversion layers 204a, 204b to the substrate 201, and is a reflection layer that reflects the first light generated by the wavelength conversion in the sintered body type wavelength conversion layers 204a, 204b and the second light generated by the wavelength conversion in the mixed layer type wavelength conversion layers 205a, 205b. The reflection layer also reflects the excitation light that is not completely absorbed by the sintered body type wavelength conversion layers 204a, 204b and the mixed layer type wavelength conversion layers 205a, 205b. The excitation light reflected in the reflection layer is absorbed again in the sintered body type wavelength conversion layers 204a, 204b or the mixed layer type wavelength conversion layers 205a, 205b and converted into the first light or the second light. As a result, the efficiency of wavelength conversion in the sintered body type wavelength conversion layers 204a, 204b and the mixed layer type wavelength conversion layers 205a, 205b is improved. The inner diameter and outer diameter of the adhesive layer 202 are almost the same as the inner diameter R1 and outer diameter R2 of the sintered body type wavelength conversion layers 204a, 204b, respectively. That is, the width of the adhesive layer 202 is almost the same as the width of the sintered body type wavelength conversion layers 204a, 204b, and is larger than the width of the mixed layer type wavelength conversion layers 205a, 205b.

[0062] <Opening>

[0063] There may be one or more openings 206. When the openings 206 are provided, since the excitation light passes through the openings 206, blue light is used as the excitation light.

[0064] <Method for Manufacturing Phosphor Wheel>

[0065] Figure 2 : is a flowchart showing the method for manufacturing the fluorescent substance wheel according to Embodiment 1. The method for manufacturing the fluorescent substance wheel according to Embodiment 1 includes the following steps.

[0066] (1) Applying an adhesive layer to the substrate (S01). The adhesive layer may be, for example, a mixed layer in which particles with high reflectivity are filled in a heat-resistant resin such as silicone or silsesquioxane. In this case, it also functions as a reflective layer. Alternatively, it may be a mixed layer in which particles with high thermal conductivity are filled in a heat-resistant resin such as silicone or silsesquioxane. In this case, it also functions as a reflective layer. In this case, it has the effect of suppressing the temperature rise of the phosphor layer. Alternatively, particles with high reflectivity and high thermal conductivity may be mixed, or heat-resistant resins such as silicone or silsesquioxane may be used without mixing particles.

[0067] (2) A sintered body of first wavelength conversion particles that converts the wavelength of the excitation light into light of the first wavelength is attached to the substrate ( S02 ). The attachment of the sintered body of the first wavelength conversion particles will be described later.

[0068] (3) The adhesive layer is cured to fix the sintered body type wavelength conversion layer (S03).

[0069] (4) A mixed layer ( S04 ) in which second wavelength conversion particles and a support are mixed is applied on the substrate on the same circumference as the sintered body type wavelength conversion layer. The second wavelength conversion particles convert the wavelength of the excitation light into light of the second wavelength.

[0070] (5) The mixed layer is cured to form a mixed layer type wavelength conversion layer ( S05 ).

[0071] Through the above steps, the phosphor wheel according to the first embodiment can be obtained.

[0072] <Step of attaching the sintered body of the first wavelength conversion particle>

[0073] Figure 3 It is shown Figure 2 Flow chart of a method for manufacturing a phosphor wheel. Figure 3 (a) is a plan view showing details of a step of aligning and attaching a sintered body type wavelength conversion layer 204 including a sintered body of first wavelength conversion particles to a substrate. Figure 3 (b) is Figure 3 (a) the main view, Figure 3 (c) is a plan view showing the sintered body type wavelength conversion layer 204 through the substrate.

[0074] like Figure 3As shown, in the process of attaching the sintered body type wavelength conversion layer 204 to the substrate 201, guide pins 211, 212a, 212b, 212c are used to align the position of the sintered body type wavelength conversion layer 204 to the substrate 201. The guide pins 211, 212a, 212b, 212c are provided on the attachment base 210. The guide pin 211 is arranged to pass through the motor mounting hole 208 of the substrate 201. The guide pin 212a is arranged at the front end of the left end of the sintered body type wavelength conversion layer 204, and is arranged to pass through the opening 206 of the substrate 201. The guide pins 212b and 212c are arranged on both sides of the front end of the right end of the sintered body type wavelength conversion layer 204. In addition, as shown in Figure 3 As shown in (b), the height of the guide pins 212b and 212c is lower than that of the sintered body type wavelength conversion layer 204, for example, by several tens of μm. Alternatively, the guide pins 211, 212a, 212b, and 212c may be provided by other means without using the attachment base 210.

[0075] Figure 4 It is shown in Figure 3 A top view of the positional relationship between the guide pins 212a, 212b, 212c provided adjacent to the sintered wavelength conversion layer 204 and the attachment position of the substrate 201 in the process of aligning the position of the sintered wavelength conversion layer 204 on the substrate 201. Figure 5 It is shown in Figure 3 A front view of a direction in which the sintered body type wavelength conversion layer 204 is attached to the substrate 201 in a step of aligning and attaching the sintered body type wavelength conversion layer 204 to the substrate 201.

[0076] The step of attaching the sintered wavelength conversion layer 204 to the substrate 201 is performed by relatively moving the substrate 201 and the sintered wavelength conversion layer 204 in the Z direction to attach the sintered wavelength conversion layer 204 to the adhesive layer 202 of the substrate 201 .

[0077] The guide pin 212a at the left end of the sintered body type wavelength conversion layer 204 is arranged to penetrate the opening 206 of the substrate 201, while the guide pins 212b and 212c at the right end are arranged to sandwich the portion where the hybrid layer type wavelength conversion layer is provided. In addition, the height of the guide pins 212b and 212c at the right end is made lower than the height of the sintered body type wavelength conversion layer 204, for example, by several tens of μm. Therefore, Figure 5As shown, even when the substrate 201 and the sintered body type wavelength conversion layer 204 are relatively moved in the Z direction and the sintered body type wavelength conversion layer 204 is attached to the adhesive layer 202 of the substrate 201, the guide pins 212b and 212c can be prevented from contacting the substrate 201. As a result, the influence on the part where the mixed layer type wavelength conversion layer is set later can be suppressed. In addition, according to the manufacturing method of the phosphor wheel, a sintered body type wavelength conversion layer and a mixed layer type wavelength conversion layer can be formed. As a result, a balance between conversion efficiency and heat resistance and cost can be achieved.

[0078] [1-2 Light source device]

[0079] Hereinafter, the light source device 11 using the fluorescent substance wheel 2 according to the first embodiment will be described in detail. Figure 6 FIG. 1 is a diagram showing a structure of a light source device 11 using the fluorescent substance wheel 2 according to Embodiment 1. Figure 1 The description will be given with reference to the fluorescent substance wheel 2 according to the first embodiment shown in FIG.

[0080] The blue laser beams emitted from the plurality of laser light sources 1101 are collimated by the plurality of collimating lenses 1102 respectively provided corresponding to the laser light sources 1101. The collimated blue light is incident on the subsequent convex lens 1103, the beam width is reduced, and then incident on the subsequent diffuser 1104 and diffused, thereby improving the uniformity of the light. The blue light with improved uniformity of the light is incident on the subsequent concave lens 1105, and is collimated into a parallel beam.

[0081] The blue light collimated by the concave lens 1105 is incident on the color separation and synthesis mirror 1106 arranged at an inclination of about 45 degrees with respect to the optical axis, and the traveling direction of the light is changed by 90 degrees, and then is incident on the subsequent convex lens 1107. The color separation and synthesis mirror 1106 has the following spectral characteristics: it reflects the light in the wavelength band of the blue light emitted from the laser light source 1101, and allows the light in the wavelength band of the fluorescent light after the wavelength conversion of the excitation light emitted from the laser light source 1101 in the fluorescent body wheel 2 described later to pass.

[0082] In addition, the color separation and synthesis mirror 1106 is assumed to have a spectral characteristic focusing on the wavelength characteristics of the blue light from the laser light source and the fluorescence after wavelength conversion, but it is not limited to this. For example, it can also have a spectral characteristic focusing on polarization and wavelength. Specifically, it can also focus on the polarization direction of the laser light source and adjust the polarization direction of the blue light from the laser light source to the same direction. Thus, it can also have a spectral characteristic focusing on polarization and wavelength, such as reflecting the light of the wavelength band and polarization direction of the blue light from the laser light source and transmitting the light of the wavelength band of the fluorescence after wavelength conversion.

[0083] The blue light incident on the convex lens 1107 is combined with the subsequent convex lens 1108 to be incident on the wavelength conversion layers 204a, 204b, 205a, 205b and the openings 206a, 206b provided on the same radius in the subsequent phosphor wheel 2.

[0084] The fluorescent wheel 2 is provided with a motor 309. With the rotation axis of the motor 309 as the center, the blue excitation light focused by the convex lenses 1107 and 1108 is arranged to be incident on the same radial area from the rotation center where the wavelength conversion layers 204a, 204b, 205a, 205b and the openings 206a and 206b are arranged.

[0085] First, the blue light focused by the convex lenses 1107 and 1108 onto the wavelength conversion layers 204a, 204b, 205a, and 205b of the phosphor wheel 2 is wavelength-converted into phosphor light, and the traveling direction of the light is changed by 180 degrees and then sequentially enters the convex lenses 1108 and 1107 again to be parallelized. The phosphor light after the wavelength conversion by the phosphor wheel 2 optimizes the wavelength region so as to be combined with the blue light emitted from the laser light source 1101 to form, for example, white light.

[0086] The fluorescence emitted from the convex lens 1107 and collimated into a beam is incident again on the color separation and synthesis mirror 1106. As described above, the color separation and synthesis mirror 1106 has the characteristic of transmitting light in the wavelength band of the fluorescence, and since it is arranged at an angle of approximately 45 degrees with respect to the optical axis, the fluorescence is directly transmitted without changing the traveling direction.

[0087] Next, the blue light from the laser light source 1101 focused on the openings 206a and 206b of the fluorescent wheel 2 passes through the fluorescent wheel 2 and is collimated by the convex lenses 1121 and 1122 at the subsequent stage. Next, the light is guided by a relay lens system composed of three reflective mirrors 1123, 1125, and 1127 and three convex lenses 1124, 1126, and 1128 provided at the subsequent stage, so that the light from the laser light source 1101 is collimated in a direction 180 degrees opposite to the incident direction and then incident on the color separation and synthesis mirror 1106.

[0088] In addition, here, the relay optical system is composed of three reflecting mirrors and three convex lenses, but other structures can also be used as long as they have the same performance.

[0089] The color separation and synthesis mirror 1106 has a characteristic of reflecting the blue light from the laser light source 1101, so the traveling direction of the blue light incident on the color separation and synthesis mirror 1106 from the convex lens 1128 is changed by 90 degrees and then reflected.

[0090] Thus, according to the above-mentioned structure, the fluorescent light and the blue light synthesized in a time-division manner by the color separation and synthesis mirror 1106 are incident on the convex lens 1109 which is the optical system of the subsequent stage.

[0091] The fluorescent light and blue light incident on the convex lens 1109 from the color separation and synthesis mirror 1106 are condensed by the convex lens 1109 to the vicinity of the incident end of the rod integrator 1111 described later. The light emitted from the convex lens 1109 is incident on the wheel 1110 with color filters before being incident on the rod integrator 1111. The wheel 1110 with color filters is synchronized with the fluorescent wheel 2 using a synchronization circuit (not shown) and is composed of a plurality of filters having a spectral characteristic of transmitting a part or the entire wavelength band of blue light and fluorescent light in accordance with the characteristics of the optical system.

[0092] The wheel 1110 with color filters has: a region that directly transmits the yellow fluorescence from the phosphor wheel 2; a region that directly transmits the green fluorescence from the phosphor wheel 2; a region that reflects the green light and transmits the red light; and a region that directly transmits the blue light from the phosphor wheel 2 that passes through the openings 206a and 206b. The phosphor wheel 2 rotates synchronously with the wheel 1110 with color filters, and focuses the light of different wavelengths in a time series near the incident end of the rod integrator 1111. The structure of the wheel with color filters is not limited to the above structure, and can be appropriately changed to match the specifications of the phosphor wheel, the light source device, and the projection type image display device.

[0093] Light of different wavelengths incident on the rod integrator 1111 in a time-division manner is uniformed by the rod integrator and emitted from the emission end. Figure 6 In the description, the wheel 1110 with color filters is arranged near the incident side of the rod integrator, but it may be arranged near the emission side.

[0094] <Effect>

[0095] In the light source device 11 using the fluorescent substance wheel 2 according to the first embodiment, it is possible to strike a balance between conversion efficiency and heat resistance and cost.

[0096] [1-3 Projection type image display device]

[0097] Hereinafter, the projection type image display device 14 using the light source device 11 using the fluorescent substance wheel 2 according to the first embodiment will be described in detail. Figure 71 is a diagram showing the structure of a projection type image display device 14 using the light source device 11 using the fluorescent substance wheel 2 according to Embodiment 1. The structure of the light source device 11 using the fluorescent substance wheel 2 according to Embodiment 1 has been described above, so the description is omitted here, and the behavior of light after being emitted from the rod integrator 1111 will be described in detail.

[0098] The light emitted from the rod integrator 1111 is projected onto a DMD 1421 described later by a relay lens system composed of convex lenses 1401 , 1402 , and 1403 .

[0099] The light that is transmitted through the convex lenses 1401 , 1402 , and 1403 and enters the total reflection prism 1411 enters the minute gap 1412 of the total reflection prism 1411 at an angle greater than the total reflection angle and is reflected, whereby the traveling direction of the light is changed and then enters the DMD 1421 .

[0100] The DMD 1421 changes the direction of the micro-mirrors according to the signal from the video circuit (not shown) in synchronization with the color light emitted by the combination of the phosphor wheel 2 and the wheel with color filters 1110, and then emits the light after changing the direction of travel. The light whose travel direction is changed by the DMD 1421 according to the video signal enters the micro-gap 1412 of the total reflection prism 1411 at an angle less than the total reflection angle, thereby being directly transmitted, entering the projection lens 1431, and being projected onto the screen (not shown).

[0101] <Effect>

[0102] In the projection type image display device 14 using the light source device 11 using the fluorescent substance wheel 2 according to the first embodiment, it is possible to strike a balance between conversion efficiency and heat resistance and cost.

[0103] (Implementation method 2)

[0104] [2-1 Structure of phosphor wheel]

[0105] Hereinafter, the structure of the fluorescent substance wheel 2a according to the second embodiment will be described in detail. Figure 8 FIG. 2 is a front view of the fluorescent wheel 2a according to the second embodiment. In the following description, new elements in the fluorescent wheel 2a according to the second embodiment are described. Figure 1 The description of the structural elements described in the figure is omitted.

[0106] Compared with the fluorescent wheel involved in embodiment 1, Figure 8As shown, the phosphor wheel 2a according to the second embodiment is different in that the reflection regions 213a and 213b are provided instead of the openings. The reflection regions 213a and 213b directly reflect the excitation light. The reflection regions 213a and 213b can be configured as regions of the adhesive layer (reflection layer) formed on the substrate 201 where the wavelength conversion layers 204a, 204b, 205a and 205b are not formed.

[0107] Furthermore, the reflective regions 213a and 213b are provided at substantially the same positions as the openings of the fluorescent body wheel according to Embodiment 1, but the present invention is not limited thereto. The reflective regions 213a and 213b are not limited to two, and may be two or more.

[0108] When the reflective region is provided instead of the opening, all light can be obtained as reflected light, and therefore, it is not necessary to consider the optical path for optically combining the excitation light that has passed through the opening and the light that has been reflected after the wavelength change.

[0109] [2-2 Light source device]

[0110] Hereinafter, a second example of the light source device 12 using the fluorescent substance wheel according to the second embodiment will be described in detail. Fig. 9 2 is a diagram showing a configuration of a second example of a light source device 12 using the fluorescent body wheel 2a according to the second embodiment. Figure 8 The fluorescent substance wheel 2a according to the second embodiment shown will be described.

[0111] The blue laser beams emitted from the plurality of laser light sources 1201 are collimated by the plurality of collimating lenses 1202 respectively provided corresponding to the laser light sources 1201. The collimated blue light is incident on the subsequent convex lens 1203, the beam width is reduced, and then incident on the subsequent diffuser 1204 and diffused, thereby improving the uniformity of the light. The blue light whose uniformity is improved by the diffuser 1204 is incident on the subsequent concave lens 1205 and is collimated.

[0112] Furthermore, the optical system up to the concave lens 1205 is adjusted so that the polarization direction of the laser light when emitted from the concave lens 1205 becomes S-polarized light with respect to the polarization and color separation and synthesis mirror 1206 described later.

[0113] The blue light collimated by the concave lens 1205 is incident on the polarization and color separation and synthesis mirror 1206 arranged at an angle of approximately 45 degrees with respect to the optical axis, and the traveling direction of the light is changed by 90 degrees, and then is incident on the subsequent λ / 4 wavelength plate 1207. The polarization and color separation and synthesis mirror 1206 has the following spectral characteristics: it reflects the S-polarized light in the blue wavelength band emitted from the laser light source 1201, and passes the P-polarized light in the blue wavelength band emitted from the laser light source 1201 and the light in the wavelength band of the fluorescent material after the excitation light from the laser light source 1201, that is, the blue light, is wavelength-converted in the fluorescent wheel 2a described later.

[0114] The polarization direction of the blue light from the laser light source 1201 incident on the λ / 4 wavelength plate 1207 is rotated and converted into circularly polarized light.

[0115] The light emitted from the λ / 4 wavelength plate 1207 is incident on the convex lens 1208, and is incident on the reflection regions 213a, 213b and the wavelength conversion layers 204a, 204b, 205a, 205b provided in the subsequent stage phosphor wheel 2a through the combination with the subsequent stage convex lens 1209. The phosphor wheel 2a is provided with a motor 409, and the blue excitation light focused by the convex lenses 1208, 1209 is arranged to be incident on the reflection regions 213a, 213b and the wavelength conversion layers 204a, 204b, 205a, 205b with the motor 409 as the rotation axis thereof as the center.

[0116] First, the blue light focused by the convex lenses 1208 and 1209 onto the wavelength conversion layers 204a, 204b, 205a, and 205b of the phosphor wheel 2a is converted into fluorescent light, and the traveling direction of the light is changed by 180 degrees and then incident on the convex lenses 1209 and 1208 in sequence again to be parallelized. The fluorescent light converted by the wavelength of the phosphor wheel 2a is optimized in each wavelength band so as to be combined with the blue light emitted from the laser light source 1201 to form white light.

[0117] The fluorescence, which is collimated and emitted by the convex lens 1208, passes through the λ / 4 wavelength plate 1207 and is incident again on the polarized light and color separation and synthesis mirror 1206 arranged at an angle of 45 degrees with respect to the optical axis. As described above, the polarized light and color separation and synthesis mirror 1206 has the characteristic of transmitting light of the wavelength band of the fluorescence, and thus allows the fluorescence to pass directly without changing the direction of the light, and the fluorescence is incident on the convex lens 1210 at the subsequent stage.

[0118] Next, the blue light from the laser light source 1201 focused on the reflection areas 213a and 213b of the fluorescent wheel 2a is reflected by the reflection areas 213a and 213b of the fluorescent wheel 2a, and its traveling direction is changed by 180 degrees and then incident on the convex lenses 1209 and 1208 in sequence to be parallelized.

[0119] The blue light, which is collimated by the convex lenses 1209 and 1208, is incident on the λ / 4 wavelength plate 1207 at the subsequent stage, and its polarization direction is rotated, converted into P-polarized light, and emitted.

[0120] The P polarized light in the blue wavelength band emitted from the λ / 4 wavelength plate 1207 is incident on the polarization and color separation and synthesis mirror 1206 arranged at an angle of approximately 45 degrees with respect to the optical axis. The polarization and color separation and synthesis mirror 1206 has the following characteristics: it reflects the S polarized light in the blue wavelength band emitted from the laser light source 1201, and transmits the P polarized light in the blue wavelength band emitted from the laser light source 1201 and the light in the wavelength band of the fluorescent material wheel 2a after the wavelength conversion. Therefore, the P polarized light in the blue wavelength band emitted from the λ / 4 wavelength plate 1207 passes directly without changing the traveling direction of the light, and is incident on the convex lens 1210 of the subsequent stage.

[0121] According to the rotation of the phosphor wheel 2a, the fluorescence and the blue light are incident on the convex lens 1210 in a time series, and are focused near the incident end of the rod integrator 1212 described later. The light focused by the convex lens 1210 is incident on the wheel with a color filter 1211. The wheel with a color filter 1211 has the same structure as the wheel with a color filter 1211 used in the light source device 11 using the phosphor wheel involved in Embodiment 1. The phosphor wheel 2a rotates synchronously with the wheel with a color filter 1211, and thus the light of different wavelength bands is focused near the incident end of the rod integrator 1212 in a time series.

[0122] Light of different wavelengths incident on the rod integrator 1212 in a time-division manner is uniformed by the rod integrator and emitted from the emission end. Fig. 9 In the description, the wheel 1211 with color filters is arranged near the incident side of the rod integrator, but it may be arranged near the emission side.

[0123] <Effect>

[0124] In the light source device 12 using the fluorescent substance wheel 2 a according to the second embodiment, it is possible to strike a balance between conversion efficiency and heat resistance and cost.

[0125] [2-3 Projection type image display device]

[0126] Hereinafter, the projection type image display device 15 using the light source device 12 using the fluorescent substance wheel 2a according to the second embodiment will be described in detail. Fig.10 1 is a diagram showing a configuration of a projection type image display device 15 using a light source device 12 using a fluorescent substance wheel 2 a according to the second embodiment.

[0127] The structure of the light source device 12 using the fluorescent body wheel according to the second embodiment has been described above, so the description thereof is omitted here. Fig.10 The behavior of light after being emitted from the rod integrator 1212 in the projection type image display device 15 shown in FIG. Figure 7 The behavior of light emitted from the rod integrator 1111 described in the projection type image display device 14 shown is substantially the same, and therefore the same reference numerals are given and the description thereof is omitted here.

[0128] <Effect>

[0129] In the projection type image display device 15 using the light source device 12 using the fluorescent substance wheel 2a according to the second embodiment, it is possible to strike a balance between conversion efficiency and heat resistance and cost.

[0130] (Implementation method 3)

[0131] [3-1 Structure of phosphor wheel]

[0132] Hereinafter, the structure of the fluorescent substance wheel 2b according to Embodiment 3 will be described in detail. The same structures as those in Embodiments 1 and 2 are denoted by the same reference numerals and the description thereof will be omitted. Fig.11 2 is a schematic top view showing the planar structure of the fluorescent body wheel 2b involved in Embodiment 3. Fig.11 As shown, the phosphor wheel 2 b includes a rotatable substrate 201 , a plurality of wavelength conversion layers 224 a , 224 b , 225 a , and 225 b , and an adhesive layer 202 (reflection layer) provided between the substrate 201 and the plurality of wavelength conversion layers 224 a , 224 b , 225 a , and 225 b .

[0133] A plurality of wavelength conversion layers 224a, 224b, 225a, 225b are arranged on the substrate 201, and convert the same excitation light wavelength into light of different wavelengths. The plurality of wavelength conversion layers 224a, 224b, 225a, 225b are sintered body type wavelength conversion layers 224a, 224b and mixed layer type wavelength conversion layers 225a, 225b. The sintered body type wavelength conversion layers 224a, 224b are composed of a sintered body of first wavelength conversion particles that convert the wavelength of the excitation light into light of the first wavelength. The mixed layer type wavelength conversion layers 225a, 225b are mixed layers of a support body and second wavelength conversion particles filled in the support body, and the second wavelength conversion particles convert the wavelength of the excitation light into light of the second wavelength.

[0134] According to the phosphor wheel 2 b , since it includes the sintered body type wavelength conversion layers 224 a and 224 b and the mixed layer type wavelength conversion layers 225 a and 225 b , it is excellent in the balance between conversion efficiency and heat resistance and cost.

[0135] Hereinafter, each member constituting the fluorescent substance wheel 2 b will be described.

[0136] <Wavelength Conversion Layer>

[0137] The wavelength conversion layer is a sintered body type wavelength conversion layer 224a, 224b and a mixed layer type wavelength conversion layer 225a, 225b. These wavelength conversion layers 224a, 224b, 225a, 225b are arranged on the substrate 201 on the same circumference from the rotation center of the substrate 201. In addition, on the same circumference, openings 206a, 206b are provided in the same manner as in Embodiment 1. In addition, as shown in Embodiment 2, a reflective region can be provided instead of the opening to constitute a phosphor wheel. The sintered body type wavelength conversion layers 224a, 224b and the mixed layer type wavelength conversion layers 225a, 225b can be adjacent to each other on the same circumference, or can be adjacent to each other with the openings 206a, 206b sandwiched therebetween. In addition, since the temperature of the sintered body type wavelength conversion layers 224a and 224b and the mixed layer type wavelength conversion layers 225a and 225b increases when they overlap, they may be adjacent to each other with a slight gap therebetween.

[0138] The mixed layer type wavelength conversion layers 225a, 225b and the sintered body type wavelength conversion layers 224a, 224b may also differ in at least one of the inner diameters r3, R3 and the outer diameters r4, R4 from the rotation center of the substrate. In the third embodiment, unlike the cases of the first and second embodiments, Fig.11 As shown, the inner diameter R3 of the sintered body type wavelength conversion layer 224a, 224b is larger than the inner diameter r3 of the mixed layer type wavelength conversion layer 225a, 225b (R3>r3), and the outer diameter R4 of the sintered body type wavelength conversion layer 224a, 224b is smaller than the outer diameter r4 of the mixed layer type wavelength conversion layer 225a, 225b (R4>r4). <r4)。

[0139] In addition, the mixed layer type wavelength conversion layers 225a, 225b and the sintered body type wavelength conversion layers 224a, 224b may have different widths in the radial direction from the rotation center of the substrate 201. In the third embodiment, unlike the cases of the first and second embodiments, Fig.11 As shown, the radial width (r4-r3) of the mixed layer type wavelength conversion layer 225a is wider than the radial width (R4-R3) of the sintered body type wavelength conversion layers 224a and 224b, and has a relationship of (r4-r3)>(R4-R3).

[0140] Since at least one of the inner diameters R3 and r3 of the sintered body type wavelength conversion layers 224a and 224b and the outer diameters R4 and r4 of the mixed layer type wavelength conversion layers 225a and 225b is different from each other, it is possible to arrange guide pins disposed around the sintered body of the first wavelength conversion particles in a radially offset manner from the position where the mixed layer type wavelength conversion layers are disposed at the time of manufacturing the phosphor wheel. Therefore, it is easy to align the sintered body type wavelength conversion layers 224a and 224b when bonding them to the substrate.

[0141] <Sintered Wavelength Conversion Layer>

[0142] The sintered body type wavelength conversion layers 224a and 224b are composed of a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of the first wavelength, similarly to the sintered body type wavelength conversion layers 204a and 204b described in the first embodiment.

[0143] <Hybrid-Layer Type Wavelength Conversion Layer>

[0144] The mixed layer type wavelength conversion layers 225a, 225b are similar to the mixed layer type wavelength conversion layers 205a, 205b described in embodiment 1, and are mixed layers of a support and second wavelength conversion particles filled in the support. The second wavelength conversion particles convert the wavelength of excitation light into light of a second wavelength.

[0145] <Adhesive layer>

[0146] The bonding layer 202 is provided between the substrate 201 and the sintered body type wavelength conversion layers 224a, 224b and the mixed layer type wavelength conversion layers 225a, 225b. The bonding layer 202 is provided to bond the sintered body type wavelength conversion layers 224a, 224b to the substrate 201, and is a reflection layer that reflects the first light generated by the wavelength conversion in the sintered body type wavelength conversion layers 224a, 224b and the second light generated by the wavelength conversion in the mixed layer type wavelength conversion layers 225a, 225b. The reflection layer also reflects the excitation light that is not completely absorbed by the sintered body type wavelength conversion layers 224a, 224b and the mixed layer type wavelength conversion layers 225a, 225b. The excitation light reflected in the reflection layer is absorbed again in the sintered body type wavelength conversion layers 224a, 224b or the mixed layer type wavelength conversion layers 225a, 225b and converted into the first light or the second light. As a result, the efficiency of wavelength conversion in the sintered body type wavelength conversion layers 224a, 224b and the mixed layer type wavelength conversion layers 225a, 225b is improved. The inner diameter and outer diameter of the adhesive layer 202 are almost the same as the inner diameter r3 and outer diameter r4 of the mixed layer type wavelength conversion layers 225a, 225b, respectively. That is, the width of the adhesive layer 202 is almost the same as the width of the mixed layer type wavelength conversion layers 225a, 225b, and is larger than the width of the sintered body type wavelength conversion layers 224a, 224b. Therefore, the adhesive layer 202 is exposed on both sides of the radial direction of the sintered body type wavelength conversion layers 224a, 224b.

[0147] <Method for Manufacturing Phosphor Wheel>

[0148] The method for manufacturing the fluorescent wheel 2b according to the third embodiment includes the steps described in the first embodiment. Figure 2 The various steps are shown in the flowchart.

[0149] In step S01, an adhesive paste for forming an adhesive layer (reflective layer) is sprayed and applied from a coating nozzle of a coating machine to a portion of the substrate 201 where the sintered body type wavelength conversion layers 224a, 224b and the mixed layer type wavelength conversion layers 225a, 225b are provided. The coating width of the adhesive layer can be controlled by the diameter of the coating nozzle that sprays the adhesive paste.

[0150] In step S02 , the sintered body type wavelength conversion layers 224 a and 224 b are aligned and attached to the adhesive layer 202 coated on the substrate 201 . Fig.12 as well as Fig.13 This is a diagram for explaining the positional alignment of the sintered body type wavelength conversion layer during the manufacture of the phosphor wheel according to the third embodiment. Fig.12 This shows the case where the center angle of the attached sintered body type wavelength conversion layer is smaller than the designed value. Fig.13The case where the center angle of the attached sintered body type wavelength conversion layer is larger than the design value is shown in the vicinity of the sintered body type wavelength conversion layer 224a of the phosphor wheel 2b, but the same is true for the vicinity of the sintered body type wavelength conversion layer 224b.

[0151] When the center angle of the attached sintered body type wavelength conversion layer is smaller than the design value, when the sintered body type wavelength conversion layer 224a is to be arranged at the center of the width of the adhesive layer 202, as shown in FIG. Fig.12 As shown in part A of (a), since the end of the sintered body type wavelength conversion layer 224a does not reach the boundary between the adhesive layer 202 and the opening 206a, a gap G in which the adhesive layer 202 is exposed is generated between the end of the sintered body type wavelength conversion layer 224a and the boundary. In this case, since there is no sintered body type wavelength conversion layer 224a at the gap G and the adhesive layer 202 is exposed, the excitation light incident on the phosphor wheel 2b is directly reflected.

[0152] Fig.12 (b) shows the following situation: in order to prevent the generation of the gap G, the sintered body type wavelength conversion layer 224a is offset in the direction of the opening 206a, and the end of the sintered body type wavelength conversion layer 224a is located at the boundary between the adhesive layer 202 and the opening 206a, and the sintered body type wavelength conversion layer 224a is attached. In this case, the sintered body type wavelength conversion layer 224a is offset from the center of the width of the adhesive layer 202 toward the rotation center direction of the substrate 201, especially on the mixed layer type wavelength conversion layer 225a side. However, as described above, since the width of the adhesive layer 202 is wider than that of the sintered body type wavelength conversion layer 224a, the entire back side (the surface facing the substrate 201) of the sintered body type wavelength conversion layer 224a can be reliably bonded to the substrate 201 through the adhesive layer 202.

[0153] In addition, when the center angle of the attached sintered body type wavelength conversion layer is larger than the design value, when the sintered body type wavelength conversion layer 224a is to be arranged at the center of the width of the adhesive layer 202, as shown in FIG. Fig.13 As shown in part A of (a), the end of the sintered body type wavelength conversion layer 224a exceeds the boundary between the adhesive layer 202 and the opening 206a and extends toward the opening 206a, thereby generating an extension P. When the extension P is generated, the fluorescence generated from the excitation light by the extension P is not reflected by the adhesive layer 202 (reflection layer), and the reflection efficiency is reduced. In addition, since the extension P is not bonded by the adhesive layer 202, the sintered body type wavelength conversion layer 224a is easily detached from the extension P.

[0154] Fig.13(b) shows the following situation: in order to prevent the protruding portion P from being generated, the sintered body type wavelength conversion layer 224a is offset from the opening 206a to the bonding layer 202, and the end of the sintered body type wavelength conversion layer 224a is positioned at the boundary between the bonding layer 202 and the opening 206a, and the sintered body type wavelength conversion layer 224a is attached. In this case, the sintered body type wavelength conversion layer 224a is offset from the center of the width of the bonding layer 202 to the outer circumference of the substrate 201, especially on the side of the mixed layer type wavelength conversion layer 225a. However, as described above, since the width of the bonding layer 202 is wider than that of the sintered body type wavelength conversion layer 224a, the entire back side of the sintered body type wavelength conversion layer 224a can be reliably bonded to the substrate 201 through the bonding layer 202.

[0155] As described above, in the phosphor wheel 2 b of the third embodiment, since the width of the adhesive layer 202 (reflective layer) is wider than the width of the sintered wavelength conversion layers 224 a and 224 b, even if the size of the sintered wavelength conversion layers 224 a and 224 b is smaller than or larger than the designed value, the end positions of the sintered wavelength conversion layers 224 a and 224 b can be aligned with the boundary between the adhesive layer 202 and the opening 206 a, and the entire back surface of the sintered wavelength conversion layers 224 a and 224 b can be reliably bonded to the substrate 201.

[0156] In step S04, a mixed layer for forming mixed layer type wavelength conversion layers 225a, 225b is applied on the cured adhesive layer 202 on the substrate 201. The coating width of the mixed layer can be controlled according to the caliber of the coating nozzle that sprays the mixed paste. As described above, since the width of the mixed layer type wavelength conversion layer 225a, 225b is almost the same as the width of the adhesive layer 202, the coating nozzle for coating the mixed layer can be shared with the coating nozzle of the same caliber for coating the adhesive layer. If the coating nozzle can be shared in the adhesive layer coating process (S01) and the mixed layer coating process (S04), it is possible to prevent mistakes such as using the wrong coating nozzle in the operation process. In addition, since there is no need to prepare a coating nozzle separately in each process of the adhesive layer coating process (S01) and the mixed layer coating process (S04), the purchase cost of the coating nozzle can be reduced.

[0157] [3-2 Light source device, projection type image display device]

[0158] The fluorescent body wheel 2b according to the third embodiment is connected to the light source device 11 ( Figure 6 ) and the projection type image display device 14 ( Figure 7) is replaced with the fluorescent wheel 2, a light source device and a projection type image display device can be configured. In addition, similarly to the case described in the second embodiment, the fluorescent wheel 2b involved in the third embodiment can be configured as a fluorescent wheel in which the openings 206a and 206b are replaced with the reflection areas 213a and 213b. The fluorescent wheel in which the openings 206a and 206b of the fluorescent wheel 2b are replaced with the reflection areas 213a and 213b is connected to the light source device 12 ( Fig. 9 ) and a projection type image display device 15 ( Fig.10 ) is replaced with the fluorescent body wheel 2a, a light source device and a projection type image display device can be configured. In the light source device and the projection type image display device using the fluorescent body wheel 2b involved in the third embodiment (including the fluorescent body wheel in which the openings 206a and 206b are replaced with the reflection areas 213a and 213b), it is also possible to achieve a balance between conversion efficiency and heat resistance and cost, similarly to the light source device 11 of the first embodiment.

[0159] Furthermore, the present disclosure includes a method of appropriately combining any of the various embodiments and / or examples described above, which can achieve the effects of each embodiment and / or example.

[0160] Industrial Applicability

[0161] According to the phosphor wheel of the present disclosure, the sintered body type wavelength conversion layer and the mixed layer type wavelength conversion layer are provided, thereby achieving a balance between conversion efficiency and heat resistance and cost.

[0162] Explanation of symbols

[0163] 2, 2a, 2b Phosphor wheel

[0164] 201 substrate

[0165] 202 Adhesive layer

[0166] 204, 204a, 204b, 224a, 224b Sintered body type wavelength conversion layer

[0167] 205a, 205b, 225a, 225b Mixed layer type wavelength conversion layer

[0168] 206, 206a, 206b opening

[0169] 208 Motor mounting hole

[0170] 210 Attachment base

[0171] 211 Guide pin

[0172] 212a, 212b, 212c Guide pins

[0173] 213a, 213b Reflection area

[0174] 11 Light source device

[0175] 1101 Laser Light Source

[0176] 1102 Collimating lens

[0177] 1103 Convex lens

[0178] 1104 Diffuser Plate

[0179] 1105 Concave lens

[0180] 1106 Color Separation Synthesis Mirror

[0181] 1107 Convex lens

[0182] 1108 Convex lens

[0183] 309 Motor

[0184] 1109 Convex lens

[0185] 1110 Wheel with color filter

[0186] 1111 Rod Integrator

[0187] 1121 Convex lens

[0188] 1122 Convex lens

[0189] 1123 Reflector

[0190] 1124 Convex lens

[0191] 1125 Reflector

[0192] 1126 Convex lens

[0193] 1127 Reflector

[0194] 1128 Convex lens

[0195] 12 Light source device

[0196] 1201 Laser Light Source

[0197] 1202 Collimating lens

[0198] 1203 Convex lens

[0199] 1204 Diffuser Plate

[0200] 1205 Concave lens

[0201] 1206 Polarized light and color separation synthesis lens

[0202] 1207 λ / 4 Wavelength Plate

[0203] 1208 Convex lens

[0204] 1209 Convex lens

[0205] 409 Motor

[0206] 1210 Convex lens

[0207] 1211 Wheel with color filter

[0208] 1212 Rod Integrator

[0209] 14, 15 Projection type image display device

[0210] 1401 Convex lens (relay lens)

[0211] 1402 Convex lens (relay lens)

[0212] 1403 Convex lens (relay lens)

[0213] 1411 Total Reflection Prism

[0214] 1412 Small gap

[0215] 1421 DMD

[0216] 1431 Projection lens

[0217] R1, R3, r1, r3 inner diameter

[0218] R2, R4, r2, r4 outer diameter.

Claims

1. A fluorescent wheel comprising: A substrate capable of rotating; A plurality of wavelength conversion layers are disposed on the substrate; and an adhesive layer disposed between the substrate and the plurality of wavelength conversion layers, At least a first wavelength conversion layer among the plurality of wavelength conversion layers is a sintered body type wavelength conversion layer, the sintered body type wavelength conversion layer being composed of a sintered body of first wavelength conversion particles that converts the wavelength of excitation light into light of a first wavelength, At least the second wavelength conversion layer among the multiple wavelength conversion layers is a mixed layer type wavelength conversion layer, which is a mixed layer of a support body and second wavelength conversion particles filled in the support body, and the second wavelength conversion particles convert the wavelength of the excitation light into light of a second wavelength different from the first wavelength.

2. The phosphor wheel according to claim 1, wherein: The first wavelength conversion layer and the second wavelength conversion layer are disposed adjacent to each other on the substrate.

3. The phosphor wheel according to claim 2, wherein: The first wavelength conversion layer and the second wavelength conversion layer are different from each other in at least one of an inner diameter or an outer diameter from a rotation center of the substrate.

4. The phosphor wheel according to claim 2, wherein: The first wavelength conversion layer and the second wavelength conversion layer have different widths in a radial direction from a rotation center of the substrate.

5. The phosphor wheel according to claim 2, wherein: An inner diameter of the first wavelength conversion layer from the rotation center of the substrate is larger than an inner diameter of the second wavelength conversion layer from the rotation center of the substrate, and an outer diameter of the first wavelength conversion layer from the rotation center of the substrate is smaller than an outer diameter of the second wavelength conversion layer from the rotation center of the substrate.

6. The phosphor wheel according to claim 1, wherein: An opening is provided on the same circumference as the rotation center of the substrate on which the plurality of wavelength conversion layers are arranged.

7. The phosphor wheel according to claim 1, wherein: A reflective region is provided on the same circumference as the rotation center of the substrate on which the plurality of wavelength conversion layers are arranged. 8 . A light source device comprising the fluorescent substance wheel according to claim 1 . 9 . A projection type image display device comprising the light source device according to claim 8 .

10. A method for manufacturing a phosphor wheel, comprising: The process of applying an adhesive layer to a substrate; a step of attaching a sintered body of first wavelength conversion particles that convert the wavelength of the excitation light into light of a first wavelength to the substrate; The step of curing the adhesive layer to form a sintered body type wavelength conversion layer; A step of coating a mixed layer containing second wavelength conversion particles and a support on the substrate on the same circumference as the sintered body type wavelength conversion layer, wherein the second wavelength conversion particles convert the wavelength of the excitation light into light of a second wavelength different from the first wavelength; and A step of curing the mixed layer to form a mixed layer type wavelength conversion layer.

11. The method for manufacturing a fluorescent wheel according to claim 10, wherein: In the process of forming the sintered body type wavelength conversion layer, guide pins for position alignment are provided around the sintered body of the first wavelength conversion particle, the substrate and the sintered body of the first wavelength conversion particle are relatively moved in a direction perpendicular to the surface along the guide pins, and the sintered body of the first wavelength conversion particle is attached to the portion of the substrate coated with the adhesive layer.

12. The method for manufacturing a fluorescent wheel according to claim 11, wherein: In the process of forming the mixed layer type wavelength conversion layer, excluding the portion corresponding to the guide pin, the mixed layer in which the second wavelength conversion particles and the support body are mixed is applied on the substrate at a portion adjacent to the sintered body of the first wavelength conversion particles.

Images