Phosphor wheel, light source device, and projection-type image display device

Abstract

A phosphor wheel is provided with: a rotatable substrate; and a plurality of wavelength conversion layers which are disposed on the substrate and in which a first sintered-body-type wavelength conversion layer having a sintered body of first wavelength conversion particles for wavelength-converting the excitation light to light of a first wavelength and a second sintered-body-type wavelength conversion layer having a second wavelength-converting particle for wavelength-converting the excitation light to light of a second wavelength are disposed adjacent to each other in a circumferential direction centered on the center of rotation of the substrate. The second sintered-body-type wavelength conversion layer has a sintered body of second wavelength conversion particles that convert the wavelength of the excitation light to light of a second wavelength different from the first wavelength. And an adhesive layer provided between the substrate and the plurality of wavelength conversion layers, the first sintered wavelength conversion layer having, at an end portion in the circumferential direction, a portion not in contact with an end portion in the circumferential direction of the second sintered wavelength conversion layer at a boundary where the first sintered wavelength conversion layer and the second sintered wavelength conversion layer are adjacent to each other.

Description

Technical Field

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

[0002] Conventional phosphor wheels using a phosphor layer (wavelength conversion layer) use a so-called mixed layer type wavelength conversion layer system including only phosphor particles dispersed and applied to a resin paste and a sintered body type wavelength conversion layer system including only a sintered body of 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 former phosphor wheel using a mixed layer type wavelength conversion layer, a large number of fluorescence wavelengths can be selected, which is superior in terms of cost, but there are problems in terms of conversion efficiency and heat resistance. On the other hand, in the phosphor wheel using a sintered body type wavelength conversion layer, the conversion efficiency and heat resistance are superior, but the cost is a problem.

[0007] Furthermore, when a plurality of sintered body type wavelength conversion layers are used adjacent to each other, when each sintered body type wavelength conversion layer is bonded to a substrate, it is impossible to arrange pins for aligning the adjacent sintered body type wavelength conversion layers, making alignment difficult.

[0008] An object of the present disclosure is to provide a phosphor wheel that can align first and second sintered body type wavelength conversion layers adjacent to each other and has excellent conversion efficiency and heat resistance.

[0009] The phosphor wheel disclosed herein comprises: a rotatable substrate; a plurality of wavelength conversion layers arranged on the substrate, wherein a first sintered body type wavelength conversion layer and a second sintered body type wavelength conversion layer are arranged adjacent to each other in a circumferential direction centered on a rotation center of the substrate, the first sintered body type wavelength conversion layer having a sintered body of first wavelength conversion particles that converts the wavelength of excitation light into light of a first wavelength, and the second sintered body type wavelength conversion layer having a sintered body of second wavelength conversion particles that converts the wavelength of excitation light into light of a second wavelength different from the first wavelength; and an adhesive layer provided between the substrate and the plurality of wavelength conversion layers, wherein at a boundary between the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, the first sintered body type wavelength conversion layer has a portion at a circumferential end that is not connected to a circumferential end of the second sintered body type wavelength conversion layer.

[0010] The manufacturing method of the phosphor wheel involved in the present disclosure includes: a step of coating an adhesive layer on a substrate; a step of arranging a first sintered body type wavelength conversion layer and a second sintered body type wavelength conversion layer adjacent to each other on the substrate, the first sintered body type wavelength conversion layer having a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength, and the second sintered body type wavelength conversion layer having a sintered body of second wavelength conversion particles that convert the wavelength of excitation light into light of a second wavelength different from the first wavelength; and a step of curing the adhesive layer to fix the first and second sintered body type wavelength conversion layers to the substrate, in the step of arranging the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, the first sintered body type wavelength conversion layer is arranged to have a portion at a circumferential end portion of the first sintered body type wavelength conversion layer that is not connected to a circumferential end portion of the second sintered body type wavelength conversion layer at a boundary adjacent to the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer.

[0011] According to the phosphor wheel according to the present disclosure, the first and second sintered body type wavelength conversion layers are adjacent to each other, thereby achieving excellent conversion efficiency and heat resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic plan view showing a planar structure of the fluorescent substance wheel according to the first embodiment.

[0013] Figure 2 1 is a flowchart showing each step of the method for manufacturing the fluorescent substance wheel according to the first embodiment.

[0014] Figure 3 exist Figure 2 In the flowchart showing the method for manufacturing a phosphor wheel, (a) is a plan perspective view showing a substrate provided with an adhesive layer and observed from the back side of the substrate, (b) is a front view showing a state in which the first sintered body type wavelength conversion layer and the pasting base are aligned in order to be pasted to the substrate of (a), (c) is a front view showing a state in which the second sintered body type wavelength conversion layer is adjacent to the first sintered body type wavelength conversion layer and aligned in position, and (d) is a schematic top view showing the first and second sintered body type wavelength conversion layers that are aligned and arranged adjacent to each other on the pasting base of (c).

[0015] Figure 4 This is a schematic plan view showing a planar structure of a fluorescent substance wheel according to the second embodiment.

[0016] Figure 5 This is a schematic plan view showing a planar structure of a fluorescent substance wheel according to the third embodiment.

[0017] Figure 6This is a schematic plan view showing first and second sintered body type wavelength conversion layers which are aligned and arranged adjacent to each other on a pasting base in the method for manufacturing a phosphor wheel according to the third embodiment.

[0018] Figure 7 It is a schematic plan view showing a planar structure of a fluorescent substance wheel according to the fourth embodiment.

[0019] Figure 8 This is a diagram showing the structure of a light source device according to Embodiment 5.

[0020] Fig. 9 This is a diagram showing the structure of a projection type image display device equipped with a light source device according to Embodiment 5.

[0021] Fig.10 This is a diagram showing the structure of a light source device according to Embodiment 6.

[0022] Fig.11 This is a diagram showing the structure of a projection type image display device equipped with a light source device according to Embodiment 6. DETAILED DESCRIPTION

[0023] The phosphor wheel involved in the first embodiment comprises: a rotatable substrate; a plurality of wavelength conversion layers arranged on the substrate, wherein a first sintered body type wavelength conversion layer and a second sintered body type wavelength conversion layer are arranged adjacent to each other in a circumferential direction centered on the rotation center of the substrate, the first sintered body type wavelength conversion layer having a sintered body of first wavelength conversion particles that converts the wavelength of excitation light into light of a first wavelength, and the second sintered body type wavelength conversion layer having a sintered body of second wavelength conversion particles that converts the wavelength of excitation light into light of a second wavelength different from the first wavelength; and an adhesive layer provided between the substrate and the plurality of wavelength conversion layers, wherein at a boundary between the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, the first sintered body type wavelength conversion layer has a portion at a circumferential end that is not connected to a circumferential end of the second sintered body type wavelength conversion layer.

[0024] Regarding the phosphor wheel according to the second aspect, in the first aspect, the non-contacting portion may be a cutout provided at an end portion of the first sintered body type wavelength conversion layer.

[0025] Regarding the phosphor wheel according to a third aspect, in the first or second aspect, the non-contacting portion may be a missing portion provided on at least one of the inner diameter side and the outer diameter side of the end portion of the first sintered body type wavelength conversion layer.

[0026] Regarding the phosphor wheel involved in the fourth embodiment, in any one of the above-mentioned first to third embodiments, the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer may have at least one of an inner diameter and an outer diameter different from each other at adjacent boundaries from the rotation center of the substrate.

[0027] Regarding the phosphor wheel involved in the fifth embodiment, in any one of the first to fourth embodiments, the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer may have different widths in the radial direction around the rotation center of the substrate at adjacent boundaries.

[0028] Regarding the phosphor wheel involved in the 6th embodiment, in any one of the above-mentioned 1st to 5th embodiments, the end face at the end of the first sintered body type wavelength conversion layer opposite to the second sintered body type wavelength conversion layer extends toward the inner circumference from a portion where the end face at the end of the second sintered body type wavelength conversion layer opposite to the first sintered body type wavelength conversion layer is connected on the inner circumference, and the end face at the end of the second sintered body type wavelength conversion layer opposite to the first sintered body type wavelength conversion layer extends toward the outer circumference from a portion where the end face at the end of the first sintered body type wavelength conversion layer opposite to the second sintered body type wavelength conversion layer is connected on the outer circumference.

[0029] Regarding the phosphor wheel according to a seventh aspect, in any one of the first to sixth aspects, the adhesive layer is exposed between a non-contacting portion of the first sintered body type wavelength conversion layer and an end portion of the second sintered body type wavelength conversion layer.

[0030] The phosphor wheel according to an eighth aspect may be any one of the first to seventh aspects, wherein the phosphor wheel has openings on the same circumference as the rotation center of the substrate on which the plurality of wavelength conversion layers are arranged.

[0031] The phosphor wheel according to a ninth aspect may be any one of the first to seventh aspects, wherein the phosphor wheel has a reflective region on the same circumference as the rotation center of the substrate on which the plurality of wavelength conversion layers are arranged.

[0032] A light source device according to a tenth aspect includes the fluorescent substance wheel according to any one of the first to ninth aspects.

[0033] A projection type image display device according to an eleventh aspect includes the light source device according to the tenth aspect.

[0034] The manufacturing method of the phosphor wheel involved in the 12th embodiment includes: a step of applying an adhesive layer on a substrate; a step of arranging a first sintered body type wavelength conversion layer and a second sintered body type wavelength conversion layer adjacent to each other on the substrate, the first sintered body type wavelength conversion layer having a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength, and the second sintered body type wavelength conversion layer having a sintered body of second wavelength conversion particles that convert the wavelength of excitation light into light of a second wavelength different from the first wavelength; and a step of curing the adhesive layer to fix the first and second sintered body type wavelength conversion layers to the substrate, in the step of arranging the first and second sintered body type wavelength conversion layers, the first sintered body type wavelength conversion layer is arranged to have a portion at a circumferential end portion of the first sintered body type wavelength conversion layer that is not connected to a circumferential end portion of the second sintered body type wavelength conversion layer at a boundary adjacent to the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer.

[0035] Regarding the manufacturing method of the phosphor wheel involved in the 13th embodiment, it may also be that in the above-mentioned 12th embodiment, in the process of configuring the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, guide pins for position alignment are provided adjacent to non-contacting portions, the substrate and the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer are relatively moved along the guide pins in a direction perpendicular to the surface of the substrate, and the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer are configured at a portion of the substrate coated with an adhesive layer.

[0036] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings as appropriate. However, sometimes more detailed descriptions than necessary are omitted. For example, sometimes detailed descriptions of well-known matters and repeated descriptions of substantially the same structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, substantially the same components are marked with the same reference numerals in the accompanying drawings.

[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 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 Embodiment 1. Figure 1As shown, the phosphor wheel 2 according to the first embodiment includes a rotatable substrate 201, a plurality of wavelength conversion layers including first sintered body type wavelength conversion layers 204a, 204b and second sintered body type wavelength conversion layers 205a, 205b, and an adhesive layer 202 provided between the substrate 201 and the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, 205b. The first sintered body type wavelength conversion layers 204a, 204b are composed of a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength. The second sintered body type wavelength conversion layers 205a, 205b are composed of a sintered body of second wavelength conversion particles that convert the wavelength of excitation light into light of a second wavelength. The first sintered body type wavelength conversion layers 204a, 204b and the second sintered body type wavelength conversion layers 205a, 205b are arranged adjacent to each other in the circumferential direction. The first sintered body type wavelength conversion layers 204a and 204b and the second sintered body type wavelength conversion layers 205a and 205b have portions at the adjacent boundaries where the ends in the circumferential direction of each are not in contact with the ends in the circumferential direction of the other.

[0041] According to the phosphor wheel 2, since the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, and 205b are adjacent to each other, it has excellent conversion efficiency and heat resistance.

[0042] Hereinafter, each member constituting the fluorescent substance wheel 2 will be described.

[0043] <Substrate>

[0044] The substrate 201 may be, for example, an aluminum substrate that is excellent in heat dissipation. In addition, the substrate 201 is not limited to aluminum, and may be other metals. In addition, it may be a transparent substrate such as glass or sapphire, and in addition, it may be a substrate in which a reflective area is provided on a transparent substrate such as glass or sapphire. The substrate 201 is provided with a motor mounting hole 208 for mounting a motor for rotating the motor. In addition, it may be mounted on the motor by a method other than the motor mounting hole 208.

[0045] <Wavelength Conversion Layer>

[0046] The wavelength conversion layer has a first sintered body type wavelength conversion layer 204a, 204b and a second sintered body type wavelength conversion layer 205a, 205b. These first and second sintered body type wavelength conversion layers 204a, 204b, 205a, 205b are arranged on the substrate 201 on the same circumference starting from the rotation center of the substrate 201. In addition, openings 206a, 206b may also be provided on the same circumference. In addition, the opening may be one or more than two. Alternatively, a reflective region may be provided instead of the opening as shown in Embodiment 2 described later. The first sintered body type wavelength conversion layer 204a, 204b and the second sintered body type wavelength conversion layer 205a, 205b are adjacent to each other on the same circumference. In addition, the openings 206a, 206b may also be adjacent to each other at the other end.

[0047] The first and second sintered body type wavelength conversion layers 204a, 204b, 205a, 205b have a roughly annular shape with a certain thickness, and have a front surface and a back surface that are parallel to the surface of the substrate 201 and opposite to each other, an outer peripheral surface and an inner peripheral surface that connect the front surface and the back surface and are perpendicular to the radial direction, and two end surfaces that connect the front surface and the back surface and are parallel to the radial direction and perpendicular to the front surface and the back surface. Except for the above-mentioned non-contacting parts, one end surface of the first sintered body type wavelength conversion layer 204a, 204b is in contact with one end surface of the second sintered body type wavelength conversion layer 205a, 205b.

[0048] In addition, when the first sintered body type wavelength conversion layers 204a, 204b and the second sintered body type wavelength conversion layers 205a, 205b overlap, there may be a problem that no adhesive layer is provided under one of the sintered body type wavelength conversion layers, so they may be adjacent to each other with a slight gap.

[0049] <First and Second Sintered Body Type Wavelength Conversion Layers>

[0050] The first sintered body type wavelength conversion layers 204 a and 204 b are composed of a sintered body of first wavelength conversion particles that converts the wavelength of the excitation light into light of the first wavelength.

[0051] <First Wavelength Converting Particle>

[0052] The first wavelength conversion particle is a so-called fluorescent particle, and may be a particle having 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 , Lu3Al5O that converts the blue excitation light wavelength into green fluorescence 12 Alternatively, (Y, Lu)3Al5O as a mixture thereof may be used. 12The activator may be, for example, Ce or Gd. In addition, the activator may be particles that convert blue excitation light into fluorescent light other than the aforementioned yellow or green.

[0053] The second sintered body type wavelength conversion layers 205 a and 205 b are composed of a sintered body of second wavelength conversion particles that converts the wavelength of the excitation light into light of the second wavelength.

[0054] <Second Wavelength Converting Particle>

[0055] The second wavelength conversion particle is a so-called fluorescent particle, and may be, for example, a particle having a garnet structure similarly to 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 , Lu3Al5O that converts the blue excitation light wavelength into green fluorescence 12 Alternatively, (Y, Lu)3Al5O as a mixture thereof may be used. 12 The activator may be, for example, Ce or Gd. In addition, the activator may be particles that convert blue excitation light into fluorescent light other than the aforementioned yellow or green.

[0056] By changing the structure, composition, etc., the first wavelength and the second wavelength converted in the first wavelength conversion particle and the second wavelength conversion particle can be changed in various ways.

[0057] like Figure 1 As shown in FIG. 1 , the phosphor wheel 2 according to the first embodiment is characterized in that at least one end of each of the first sintered body type wavelength conversion layers 204a, 204b and the second sintered body type wavelength conversion layers 205a, 205b is not in contact with each other at the adjacent boundaries. Here, “the ends are not in contact with each other” means that at least a part of each end near the boundary is not in contact with each other. In addition, the so-called “not in contact with each other” may be, for example, Figure 1 That is the cuts 10a, 10b, 10c, 10d. Alternatively, the "non-connected parts" can be chamfered, such as missing parts such as C-cuts and oblique cuts. Chamfers include not only straight lines but also curves. The shape of the end can be not only convex but also concave, such as polygonal shapes such as quadrilaterals, circles, and ellipses. Regarding the shapes of these ends, it is sufficient to set guide pins in the gap divided between the shapes of the two adjacent ends at the boundary. The guide pins are used for aligning the positions of the first sintered body type wavelength conversion layers 204a, 204b and the second sintered body type wavelength conversion layers 205a, 205b for pasting on the substrate.

[0058] In the fluorescent body wheel 2 of the embodiment 1, as Figure 1As shown, the first sintered body type wavelength conversion layers 204a, 204b have cutouts 10a, 10c at the ends of the boundaries adjacent to the second sintered body type wavelength conversion layers 205a, 205b, and the second sintered body type wavelength conversion layers 205a, 205b have cutouts 10b, 10d at the ends of the boundaries adjacent to the first sintered body type wavelength conversion layers 204a, 204b. The cutouts 10a, 10c are provided on the outer circumference of the ends of the first sintered body type wavelength conversion layers 204a, 204b, and the cutouts 10b, 10d are provided on the inner circumference of the ends of the second sintered body type wavelength conversion layers 205a, 205b. On the other hand, in the phosphor wheel 2 of the first embodiment, as Figure 1 As shown, no cutouts are provided on the inner peripheral sides of the first sintered body type wavelength conversion layers 204a and 204b and on the outer peripheral sides of the second sintered body type wavelength conversion layers 205a and 205b.

[0059] That is, the end surface at the end of the first sintered body type wavelength conversion layer 204a, 204b opposite to the second sintered body type wavelength conversion layer 205a, 205b extends toward the inner side from the portion where the end surface at the end of the second sintered body type wavelength conversion layer 205a, 205b opposite to the first sintered body type wavelength conversion layer 204a, 204b is connected on the inner side, and the end surface at the end of the second sintered body type wavelength conversion layer 205a, 205b opposite to the first sintered body type wavelength conversion layer 204a, 204b extends toward the outer side from the portion where the end surface at the end of the first sintered body type wavelength conversion layer 204a, 204b opposite to the second sintered body type wavelength conversion layer 205a, 205b is connected on the outer side. In other words, the cutouts 10a and 10c are opposite to the end faces of the second sintered body type wavelength conversion layers 205a and 205b that are opposite to the first sintered body type wavelength conversion layers 204a and 204b, and the cutouts 10b and 10d are opposite to the end faces of the first sintered body type wavelength conversion layers 204a and 204b that are opposite to the second sintered body type wavelength conversion layers 205a and 205b. The end faces at the adjacent boundaries of the first and second sintered body type wavelength conversion layers 204a, 204b, 205a and 205b are substantially in contact with each other except for the cutouts 10a, 10c, 10b and 10d and the portions (non-contacting portions) that are opposite to them.

[0060] Although the details will be described later, guide pins are arranged in the cutouts 10a, 10b, 10c, and 10d for aligning the positions of the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, and 205b in the manufacturing process of the phosphor wheel 2. That is, at the boundary between the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, and 205b, guide pins are arranged on the outer circumference of the end of the first sintered body type wavelength conversion layer 204a, 204b, 205a, and 205b and on the inner circumference of the end of the second sintered body type wavelength conversion layer 205a, 205b. In addition, since the cutouts 10a, 10b, 10c, and 10d are not in contact with the end faces of the opposing sintered body type wavelength conversion layers, the adhesive layer 202 is exposed from these portions.

[0061] In addition, the two ends near the boundary only need to have a portion that does not touch each other on at least one of the inner diameter side or the outer diameter side. The first sintered body type wavelength conversion layer 204a, 204b and the second sintered body type wavelength conversion layer 205a, 205b may also have a straight line boundary on one side adjacent to each other and on the opposite side.

[0062] According to the above structure, when the first sintered body type wavelength conversion layer 204a, 204b and the second sintered body type wavelength conversion layer 205a, 205b are attached to the substrate adjacent to each other, guide pins can be arranged at the boundary therebetween. Thus, the first sintered body type wavelength conversion layer 204a, 204b and the second sintered body type wavelength conversion layer 205a, 205b can be reliably aligned. Therefore, a phosphor wheel having excellent conversion efficiency and heat resistance can be obtained.

[0063] <Opening>

[0064] There may be more than one opening. When the openings 206a and 206b are provided, the excitation light is transmitted through the openings 206a and 206b, so blue light is used as the excitation light.

[0065] <Method for Manufacturing Phosphor Wheel>

[0066] 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.

[0067] (1) Applying an adhesive layer (S01) on a substrate. The adhesive layer may be, for example, a mixed layer in which heat-resistant resins such as silicone and silsesquioxane are filled with particles having high reflectivity. In this case, the layer also functions as a reflective layer. Alternatively, the layer may be a mixed layer in which heat-resistant resins such as silicone and silsesquioxane are filled with particles having high thermal conductivity. In this case, the layer also functions as a thermal conductive layer. In this case, the temperature rise of the phosphor layer is suppressed. Alternatively, particles having high reflectivity and particles having high thermal conductivity may be mixed, or heat-resistant resins such as silicone and silsesquioxane may be used without mixing particles.

[0068] (2) A first sintered body type wavelength conversion layer and a second sintered body type wavelength conversion layer are arranged adjacent to each other on a substrate (S02), wherein the first sintered body type wavelength conversion layer includes a sintered body of first wavelength conversion particles that convert the wavelength of excitation light into light of a first wavelength, and the second sintered body type wavelength conversion layer includes a sintered body of second wavelength conversion particles that convert the wavelength of excitation light into light of a second wavelength. The arrangement of the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer will be described later.

[0069] (3) The adhesive layer is cured to fix the first and second sintered body type wavelength conversion layers to the substrate ( S03 ).

[0070] Through the above steps, the phosphor wheel according to the first embodiment is obtained.

[0071] <Step of arranging the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer on the substrate>

[0072] Figure 3 exist Figure 2 In the flowchart of the method for manufacturing the phosphor wheel, (a) is a perspective view showing a substrate provided with an adhesive layer and viewed from the back of the substrate, (b) is a front view showing a state where the first sintered body type wavelength conversion layer is aligned with the pasting base for pasting to the substrate of (a), (c) is a front view showing a state where the second sintered body type wavelength conversion layer is adjacent to the first sintered body type wavelength conversion layer and aligned, and (d) is a schematic top view showing the first and second sintered body type wavelength conversion layers aligned and arranged adjacent to each other on the pasting base of (c). The first and second sintered body type wavelength conversion layers 204a and 205a are described, but the same is true for the first and second sintered body type wavelength conversion layers 204b and 205b.

[0073] In the process of disposing the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a, guide pins 211, 212a, 212b, and 212c are used to align the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a with respect to the substrate 201. The substrate 201 is held apart from the pasting base 210 by the guide pins 211 penetrating the motor mounting holes 208. At this time, the substrate 201 is disposed so that the adhesive layer 202 and the pasting base 210 face each other.

[0074] On the other hand, the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a are aligned on the pasting base 210. The guide pin 212a is arranged to penetrate the opening 206a of the substrate 201 which is the front end of the left end of the first sintered body type wavelength conversion layer 204a. In addition, the guide pin 212c is arranged to penetrate the opening 206a of the substrate 201 which is the front end of the right end of the second sintered body type wavelength conversion layer 205a. In addition, Figure 3 In the figure, the guide pins 212a and 212c are shown as two, but the present invention is not limited to this. Figure 6 The number of guide pins 212a is one, or two or more may be provided. Two guide pins 212b are provided at the boundary between the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a. Figure 3 As shown in (d) of FIG. 1 , the guide pins 212 b are arranged at the cutouts 10 a and 10 b at the boundaries between the first sintered body type wavelength conversion layer 204 a and the second sintered body type wavelength conversion layer 205 a. Figure 3 As shown in (b) and (c) of FIG. 8 , the height of the guide pin 212 b may be lower than the height of the first sintered body type wavelength conversion layer 204 a and the second sintered body type wavelength conversion layer 205 a , for example, by several tens of μm.

[0075] The first and second sintered body type wavelength conversion layers 204a and 205a are manufactured with a size having a certain tolerance relative to the design value. In the configuration of the first and second sintered body type wavelength conversion layers 204a and 205a, if the first and second sintered body type wavelength conversion layers 204a and 205a are manufactured with a size larger than the design value, the first and second sintered body type wavelength conversion layers 204a and 205a overlap each other, and conversely, if the first and second sintered body type wavelength conversion layers 204a and 205a are manufactured with a size smaller than the design value, a gap is generated between the first and second sintered body type wavelength conversion layers 204a and 205a.

[0076] Therefore, in the phosphor wheel 2 of the first embodiment, the first sintered body type wavelength conversion layer 204a is manufactured in a size not larger than the design value, and the second sintered body type wavelength conversion layer 205a is manufactured in a size not smaller than the design value. Furthermore, since the cutout 10a is located on the outer peripheral side of the first sintered body type wavelength conversion layer 204a ( Figure 1 ), the guide pin 212b disposed in the cutout 10a is located on the outer peripheral side of the first sintered body type wavelength conversion layer 204a, and is not located on the outer peripheral side of the second sintered body type wavelength conversion layer 205a. Similarly, since the cutout 10b is located on the inner peripheral side of the second sintered body type wavelength conversion layer 205a ( Figure 1 ), therefore, the guide pin 212b arranged in the cutout 10b is located on the inner peripheral side of the second sintered body type wavelength conversion layer 205a, and is not located on the inner peripheral side of the first sintered body type wavelength conversion layer 204a.

[0077] Since the guide pins 212b are not located on the inner circumference side of the first sintered body type wavelength conversion layer 204a, the first sintered body type wavelength conversion layer 204a manufactured with a size not larger than the design value can be moved toward the inner circumference side ( Figure 3 On the contrary, since the guide pin 212b is not located on the outer peripheral side of the second sintered body type wavelength conversion layer 205a, the second sintered body type wavelength conversion layer 205a manufactured with a size not smaller than the design value can be moved toward the outer peripheral side ( Figure 3 Therefore, the first sintered body type wavelength conversion layer 204a is aligned by being guided by two guide pins 212a and a guide pin 212b arranged on the inner circumference, and the second sintered body type wavelength conversion layer 205a is aligned by being guided by two guide pins 212c and a guide pin 212b arranged on the outer circumference. Thus, the first and second sintered body type wavelength conversion layers 204a and 205a manufactured with a certain tolerance in size can be aligned without gap using the guide pins 212a, 212b, and 212c.

[0078] By providing the substrate 201 ( Figure 3 (a)) and the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a ( Figure 3 (d)) is relatively moved in the Z direction to arrange the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a on the substrate 201. Specifically, the substrate 201 ( Figure 3(a)) moves toward the pasting base 210 along the guide pins 211 to paste the first sintered body type wavelength conversion layer 204 a and the second sintered body type wavelength conversion layer 205 a onto the adhesive layer 202 on the substrate 201 .

[0079] The guide pin 212a at the left end of the first sintered body type wavelength conversion layer 204a is configured to penetrate the opening 206a of the substrate 201, while the guide pin 212c at the right end of the second sintered body type wavelength conversion layer 205a is configured to penetrate the opening 206b of the substrate 201. They are configured to sandwich the portion where the second sintered body type wavelength conversion layer is set. In addition, the height of the guide pin 212b at the boundary between the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a is lower than the height of the first and second sintered body type wavelength conversion layers 204a and 205a, for example, about several tens of μm lower. Therefore, even when the substrate 201 and the first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a are relatively moved in the Z direction, the guide pin 212b can be prevented from contacting the substrate 201. Thus, the positions of the adjacent first sintered body type wavelength conversion layer 204a and the second sintered body type wavelength conversion layer 205a can be reliably aligned. In addition, holes can be provided at positions corresponding to the guide pins 212b in the substrate 201. Thus, the height of the guide pins 212b can be made higher than the heights of the first and second sintered body type wavelength conversion layers 204a and 205a.

[0080] Therefore, according to the method for manufacturing the phosphor wheel, a plurality of sintered body type wavelength conversion layers adjacent to each other can be formed, thereby achieving excellent conversion efficiency and heat resistance.

[0081] (Implementation method 2)

[0082] [1-2 Structure of phosphor wheel]

[0083] Hereinafter, the structure of the fluorescent substance wheel 2a according to the second embodiment will be described in detail. Figure 4 2 is a schematic top view showing a planar structure of the fluorescent body wheel 2a according to the second embodiment. In the following description, new elements of the fluorescent body wheel 2a according to the second embodiment are described in comparison with the fluorescent body wheel 2 according to the first embodiment. Figure 1 The description of the components already described in the text will be omitted.

[0084] like Figure 4 As shown, the fluorescent body wheel 2a according to the second embodiment is different from the fluorescent body wheel 2 according to the first embodiment in that reflection areas 213a and 213b are provided instead of the openings 206a and 206b. The reflection areas 213a and 213b directly reflect the excitation light.

[0085] The reflective regions 213a and 213b are provided at substantially the same positions as the openings 206a and 206b of the fluorescent wheel 2 according to Embodiment 1, but are not limited thereto. The reflective regions 213a and 213b are not limited to two, and may be one or more than two.

[0086] When the reflective region is provided instead of the opening, all the light is obtained as reflected light, so there is no need to consider a light circuit for performing light synthesis with the light obtained by changing the wavelength of the excitation light that has passed through the opening and then reflecting it.

[0087] (Implementation method 3)

[0088] [1-3 Structure of phosphor wheel]

[0089] Hereinafter, the structure of the fluorescent substance wheel 2b according to the third embodiment will be described in detail. Figure 5 2 is a schematic top view showing a planar structure of the fluorescent body wheel 2b according to the third embodiment. In the following description, new elements of the fluorescent body wheel 2b according to the third embodiment are described in comparison with the fluorescent body wheel according to the first embodiment. Figure 1 The description of the components already described in the text will be omitted.

[0090] like Figure 5 As shown in FIG. 1 , the phosphor wheel 2b according to the third embodiment is different from the phosphor wheel according to the first embodiment in that, instead of making cuts at the boundaries between the first sintered body type wavelength conversion layers 214a, 214b and the second sintered body type wavelength conversion layers 215a, 215b adjacent to each other, the inner diameters R1, r1 and the outer diameters R2, r2 of the respective layers are different, and stepped portions 20a, 20b, 20c, 20d are provided at the boundaries between the first sintered body type wavelength conversion layers 214a, 214b and the second sintered body type wavelength conversion layers 215a, 215b. For example, Figure 5 In the example shown, R1 <r1、R2<r2。

[0091] The first and second sintered body type wavelength conversion layers 214a, 214b, 215a, 215b have a substantially annular shape with a certain thickness, and have a front surface and a back surface that are parallel to the surface of the substrate 201 and face each other, an outer peripheral surface and an inner peripheral surface that connect the front surface and the back surface and are perpendicular to the radial direction, and two end surfaces that connect the front surface and the back surface and are parallel to the radial direction and perpendicular to the front surface and the back surface. Except for the step portions 20a, 20b, 20c, and 20d, one end surface of the first sintered body type wavelength conversion layer 214a, 214b is in contact with one end surface of the second sintered body type wavelength conversion layer 215a, 215b.

[0092] like Figure 5 As shown, in the phosphor wheel 2b, at the boundary between the first and second sintered body type wavelength conversion layers 214a, 214b, 215a, 215b, since the inner diameter R1 of the first sintered body type wavelength conversion layers 214a, 214b is smaller than the inner diameter r1 of the second sintered body type wavelength conversion layers 215a, 215b, the first sintered body type wavelength conversion layers 214a, 214b have a portion that is not in contact with the second sintered body type wavelength conversion layers 215a, 215b on the inner circumferential side of the end portion, and since the outer diameter r2 of the second sintered body type wavelength conversion layers 215a, 215b is larger than the outer diameter R2 of the first sintered body type wavelength conversion layers 214a, 214b, the second sintered body type wavelength conversion layers 215a, 215b have a portion that is not in contact with the first sintered body type wavelength conversion layers 214a, 214b on the outer circumferential side of the end portion. In addition, the end faces at the ends of the first sintered body type wavelength conversion layers 214a, 214b that are opposite to the second sintered body type wavelength conversion layers 215a, 215b extend toward the inner circumference from a portion where the end faces at the ends of the second sintered body type wavelength conversion layers 215a, 215b that are opposite to the first sintered body type wavelength conversion layers 214a, 214b are connected on the inner circumference, and the end faces at the ends of the second sintered body type wavelength conversion layers 215a, 215b that are opposite to the first sintered body type wavelength conversion layers 214a, 214b extend toward the outer circumference from a portion where the end faces at the ends of the first sintered body type wavelength conversion layers 214a, 214b that are opposite to the second sintered body type wavelength conversion layers 215a, 215b are connected on the outer circumference. The end faces of the first and second sintered body type wavelength conversion layers 214a, 214b, 215a, 215b at the adjacent boundaries are substantially in contact with each other except for the extended portion (non-contacting portion). The step portions 20a, 20c are formed by the portion extending toward the outer circumference of the end faces of the second sintered body type wavelength conversion layers 215a, 215b facing the first sintered body type wavelength conversion layers 214a, 214b and the outer circumference of the first sintered body type wavelength conversion layers 214a, 214b, and the step portions 20b, 20d are formed by the portion extending toward the inner circumference of the end faces of the first sintered body type wavelength conversion layers 214a, 214b facing the second sintered body type wavelength conversion layers 215a, 215b and the inner circumference of the second sintered body type wavelength conversion layers 215a, 215b.

[0093] exist Figure 5In the embodiment, the inner diameters R1 and r1 and the outer diameters R2 and r2 of the first sintered body type wavelength conversion layers 214a and 214b and the second sintered body type wavelength conversion layers 215a and 215b are all different, but the present invention is not limited thereto. For example, at least one of the inner diameters R1 and r1 and the outer diameters R2 and r2 of the first sintered body type wavelength conversion layers 214a and 214b and the second sintered body type wavelength conversion layers 215a and 215b from the rotation center of the substrate may be different from each other.

[0094] In addition, the first sintered body type wavelength conversion layers 214a, 214b and the second sintered body type wavelength conversion layers 215a, 215b may have the same width in the radial direction from the rotation center of the substrate 201 at the adjacent boundaries. Alternatively, they may be different from each other. Figure 5 In the illustrated example, the width (r2-r1) of the second sintered body type wavelength conversion layers 215a and 215b in the radial direction is substantially the same as the width (R2-R1) of the first sintered body type wavelength conversion layers 214a and 214b in the radial direction.

[0095] By setting any of the above conditions, at least one set of the radial positions (r1, r2, R1, R2) of the second sintered body type wavelength conversion layers 215a, 215b and the first sintered body type wavelength conversion layers 214a, 214b can be different. As a result, guide pins can be arranged on the step portions 20a, 20b, 20c, 20d of the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer so as to be offset in the radial direction from the position where the second sintered body type wavelength conversion layer is provided at the time of manufacturing the phosphor wheel. Therefore, the first and second sintered body type wavelength conversion layers 214a, 214b, 215a, 215b can be reliably aligned when being bonded to the substrate.

[0096] Therefore, according to the method for manufacturing the phosphor wheel, a plurality of sintered body type wavelength conversion layers adjacent to each other can be formed, thereby achieving excellent conversion efficiency and heat resistance.

[0097] <Step of arranging the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer on the substrate>

[0098] Figure 6 This is a schematic plan view showing the first and second sintered body type wavelength conversion layers 214a and 215a which are aligned and arranged adjacent to each other on the pasting base 210 in the method for manufacturing the phosphor wheel according to Embodiment 3. The first and second sintered body type wavelength conversion layers 214a and 215a are described below, but the first and second sintered body type wavelength conversion layers 214b and 215b are also described in the same manner.

[0099] In the phosphor wheel 2b of the third embodiment, the first sintered body type wavelength conversion layer 214a is also manufactured with a size not larger than the design value, and the second sintered body type wavelength conversion layer 215a is also manufactured with a size not smaller than the design value. Furthermore, since the step portion 20a is located on the outer peripheral side of the first sintered body type wavelength conversion layer 214a, the guide pin 212b arranged on the step portion 20a is located on the outer peripheral side of the first sintered body type wavelength conversion layer 214a, and is not located on the outer peripheral side of the second sintered body type wavelength conversion layer 215a. Similarly, since the step portion 20b is located on the inner peripheral side of the second sintered body type wavelength conversion layer 215a, the guide pin 212b arranged on the step portion 20b is located on the inner peripheral side of the second sintered body type wavelength conversion layer 215a, and is not located on the inner peripheral side of the first sintered body type wavelength conversion layer 214a.

[0100] Since the guide pins 212b are not located on the inner circumference side of the first sintered body type wavelength conversion layer 214a, the first sintered body type wavelength conversion layer 214a manufactured with a size not larger than the design value can be moved toward the inner circumference side ( Figure 6 On the contrary, since the guide pin 212b is not located on the outer peripheral side of the second sintered body type wavelength conversion layer 215a, the second sintered body type wavelength conversion layer 215a manufactured with a size not smaller than the design value can be moved toward the outer peripheral side ( Figure 6 Therefore, the first sintered body type wavelength conversion layer 214a is aligned by the guide pins 212a and the guide pins 212b arranged on the inner circumference, and the second sintered body type wavelength conversion layer 215a is aligned by the guide pins 212c and the guide pins 212b arranged on the outer circumference. Thus, the first and second sintered body type wavelength conversion layers 214a and 215a manufactured with a size having a certain tolerance relative to the design value can be aligned without gaps using the guide pins 212a, 212b, and 212c.

[0101] exist Figure 6 In, if Figure 3 In contrast, the difference is that the guide pins 212a and 212c are each one. As such, the guide pins 212a and 212c may each be one, or three or more, but are usually implemented with two or one in many cases.

[0102] In addition, guide pins 212b can be arranged on the step portions 20a, 20b, 20c, and 20d provided at the boundaries of the first sintered body type wavelength conversion layers 214a, 214b and the second sintered body type wavelength conversion layers 215a, 215b, so that the positions of the first sintered body type wavelength conversion layers 214a, 214b and the second sintered body type wavelength conversion layers 215a, 215b can be reliably aligned.

[0103] (Implementation method 4)

[0104] [1-4 Structure of phosphor wheel]

[0105] Hereinafter, the structure of the fluorescent substance wheel 2c according to the fourth embodiment will be described in detail. Figure 7 2 is a schematic top view showing a planar structure of a fluorescent substance wheel 2c according to Embodiment 4. In the following description, new elements of the fluorescent substance wheel 2c according to Embodiment 4 are described in comparison with the fluorescent substance wheel 2b according to Embodiment 3. Figure 5 The description of the components already described in the text will be omitted.

[0106] like Figure 7 As shown, the fluorescent substance wheel 2c according to the fourth embodiment is different from the fluorescent substance wheel 2b according to the third embodiment in that the reflection areas 213a and 213b are provided instead of the openings 206a and 206b. The reflection areas 213a and 213b directly reflect the excitation light.

[0107] The reflective regions 213a and 213b are provided at substantially the same positions as the openings 206a and 206b of the fluorescent wheel 2b according to Embodiment 3, but the present invention is not limited thereto. The reflective regions 213a and 213b are not limited to two, but may be one or more than two.

[0108] When the reflective region is provided instead of the opening, all the light is obtained as reflected light, so there is no need to consider a light circuit for performing light synthesis with the light obtained by changing the wavelength of the excitation light that has passed through the opening and then reflecting it.

[0109] (Implementation method 5)

[0110] [2-1 Light source device]

[0111] Hereinafter, details of the light source device 11 according to the fifth embodiment will be described. Figure 8 1 is a diagram showing a structure of a light source device 11 according to Embodiment 5. This light source device 11 uses the fluorescent body wheel 2 according to Embodiment 1. Figure 1 The description will be made with reference to the fluorescent substance wheel 2 according to the first embodiment shown.

[0112] The blue laser beams emitted from the plurality of laser light sources 1101 are collimated by the plurality of collimating lenses 1102 corresponding to the laser light sources 1101. The collimated blue light is incident on the subsequent convex lens 1103 to reduce the beam width, and then is incident on the diffuser 1104 to be 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.

[0113] The blue light, which is collimated by the concave lens 1105, is incident on the color separation and synthesis mirror 1106 arranged at an angle 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 a spectral characteristic of reflecting light in the wavelength band of blue light emitted from the laser light source 1101 and passing light in the wavelength band of fluorescence obtained by wavelength conversion of the blue light, which is the excitation light emitted from the laser light source 1101, by the fluorescent body wheel 2 described later.

[0114] In addition, here, 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 obtained after the 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 is also possible to 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. In this way, it is also possible to 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 obtained by wavelength conversion.

[0115] The blue light incident on the convex lens 1107 passes through the combination with the subsequent convex lens 1108 and is incident on the first and second sintered wavelength conversion layers 204a, 204b, 205a, 205b and the openings 206a, 206b provided on the same radius of the subsequent phosphor wheel 2.

[0116] The fluorescent wheel 2 is provided with a motor 309. The motor 309 is arranged so that the blue excitation light focused by the convex lenses 1107 and 1108 is incident on the same radial area from the rotation center where the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, 205b and the openings 206a and 206b are arranged, with the rotation axis of the motor 309 as the center.

[0117] First, the blue light focused by the convex lenses 1107 and 1108 on the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, and 205b of the phosphor wheel 2 is wavelength-converted into fluorescence, 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 fluorescence obtained by wavelength conversion by the phosphor wheel 2 is optimized in wavelength band so as to be combined with the blue light emitted from the laser light source 1101 to form, for example, white light.

[0118] The fluorescence emitted through the convex lens 1107 and collimated into a beam is again incident 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 is arranged at an angle of approximately 45 degrees with respect to the optical axis, so that the traveling direction of the fluorescence is maintained without change.

[0119] Next, the blue light from the laser light source 1101 that is focused on the openings 206a and 206b of the phosphor wheel 2 passes through the phosphor wheel 2 and is converted into a parallel beam by the convex lenses 1121 and 1122 at the subsequent stage. Next, the light is guided by a relay system composed of three reflective mirrors 1123, 1125, and 1127 and three convex lenses 1124, 1126, and 1128 at the subsequent stage, so that the light from the laser light source 1101 is converted into a parallel beam and enters the color separation and synthesis mirror 1106 from a direction 180 degrees opposite to the incident direction.

[0120] 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.

[0121] The color separation and synthesis mirror 1106 has a characteristic of reflecting the blue light from the laser light source 1101, so the blue light incident on the color separation and synthesis mirror 1106 from the convex lens 1128 changes the traveling direction of the light by 90 degrees and is reflected.

[0122] As described above, according to the above-described 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 as the subsequent optical system.

[0123] 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 optical integrator rod 1111 described later. The light emitted through the convex lens 1109 is incident on the wheel with color filters 1110 before being incident on the optical integrator rod 1111. The wheel with color filters 1110 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 that transmits a part or the entire wavelength range of blue light and fluorescent light in accordance with the characteristics of the optical system.

[0124] The wheel 1110 with color filters has a region that directly transmits the wavelength band of the yellow fluorescence from the phosphor wheel 2, a region that directly transmits the wavelength band of the green fluorescence from the phosphor wheel 2, a region that reflects the light of the green wavelength band among the yellow fluorescence from the phosphor wheel 2 and transmits the light of the red wavelength band, and a region that directly transmits the light of the blue wavelength band from the phosphor wheel 2 that passes through the openings 206a and 206b. The phosphor wheel 2 and the wheel 1110 with color filters rotate synchronously, so that the light of different wavelength bands is converged in a time series near the incident end of the optical integrator rod 1111. In addition, the structure of the wheel with color filters is not limited to the above structure, and can be appropriately changed in accordance with the specifications of the phosphor wheel, the light source device, and the projection type image display device.

[0125] The light having different wavelengths and time divisions incident on the optical integrator rod 1111 is uniformed by the optical integrator rod and emitted from the emission end. Figure 8 In the description, the wheel 1110 with color filters is arranged near the incident side of the optical integrator rod, but it may be arranged near the emission side.

[0126] <Effect>

[0127] In the light source device 11 according to the fifth embodiment, excellent conversion efficiency and heat resistance can be obtained by using the phosphor wheel 2 according to the first embodiment. Alternatively, the phosphor wheel 2b according to the third embodiment may be used instead of the phosphor wheel 2 according to the first embodiment.

[0128] [3-1 Projection type image display device]

[0129] Hereinafter, details of the projection type image display device 14 equipped with the light source device 11 according to the fifth embodiment will be described. Fig. 9 This is a diagram showing a configuration of a projection type image display device 14 using a light source device 11 according to the fifth embodiment.

[0130] In addition, since the structure of the light source device 11 according to the fifth embodiment has been described above, its description is omitted here, and the behavior of light emitted after passing through the optical rod integrator 1111 will be described in detail.

[0131] The light emitted through the optical integrator rod 1111 passes through a relay lens system composed of convex lenses 1401 , 1402 , and 1403 , and is mapped to a DMD 1421 to be described later.

[0132] The light that passes through the convex lenses 1401 , 1402 , and 1403 and enters the total reflection prism 1411 enters the minute slit 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 the light enters the DMD 1421 .

[0133] The DMD 1421 changes the direction of the micro-mirrors according to a signal from an image 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, thereby changing the traveling direction of the light and emitting it. The light whose traveling direction is changed by the DMD 1421 according to the image signal enters the micro-slit 1412 of the total reflection prism 1411 at an angle less than the total reflection angle, thereby directly passing through and entering the projection lens 1431, and is projected onto a screen (not shown).

[0134] <Effect>

[0135] In the projection type image display device 14 using the light source device 11 according to the fifth embodiment, the fluorescent substance wheel 2 according to the first embodiment (or the fluorescent substance wheel 2 b according to the third embodiment) is used, so that excellent conversion efficiency and heat resistance can be obtained.

[0136] (Implementation method 6)

[0137] [2-2 Light source device]

[0138] Hereinafter, details of the light source device 12 according to the sixth embodiment will be described. Fig.10 1 is a diagram showing the structure of a light source device 12 according to Embodiment 6. This light source device 12 uses the fluorescent body wheel 2a according to Embodiment 2. Figure 4 The description will be made with reference to the fluorescent substance wheel 2a according to the second embodiment shown.

[0139] The blue laser beams emitted from the plurality of laser light sources 1201 are collimated by the plurality of collimating lenses 1202 provided corresponding to the laser light sources 1201. The collimated blue light is incident on the subsequent convex lens 1203 to reduce the beam width, and then is incident on the diffuser 1204 to be diffused to improve the uniformity of the light. The blue light whose uniformity is improved by the diffuser 1204 is incident on the subsequent concave lens 1205 to be collimated.

[0140] The optical system up to the concave lens 1205 is adjusted so that, when emitted through the concave lens 1205 , the polarization direction of the laser light becomes S polarization with respect to the polarization and color separation and synthesis mirror 1206 described later.

[0141] The blue light that has been collimated by the concave lens 1205 is incident on the polarization and color separation synthesis mirror 1206 that is 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 synthesis mirror 1206 has a spectral characteristic of reflecting the S-polarized light in the blue wavelength band emitted from the laser light source 1201, and transmitting the P-polarized light in the blue wavelength band emitted from the laser light source 1201 and the light in the fluorescence wavelength band obtained by wavelength conversion of the blue light, which is the excitation light from the laser light source 1201, by the fluorescent wheel 2a described later.

[0142] The polarization direction of the blue light from the laser light source 1201 incident on the λ / 4 wavelength plate 1207 is rotated and changed into circularly polarized light.

[0143] The light emitted through the λ / 4 wavelength plate 1207 enters the convex lens 1208, and enters the reflection regions 213a, 213b, and the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, 205b provided in the phosphor wheel 2a in the subsequent stage through the combination with the convex lens 1209 in the subsequent stage. The phosphor wheel 2a is provided with a motor 409, and is arranged so that the blue excitation light focused by the convex lenses 1208, 1209 enters the reflection regions 213a, 213b, and the first and second sintered body type wavelength conversion layers 204a, 204b, 205a, 205b with the rotation axis of the motor 409 as the center.

[0144] First, the blue light focused by the convex lenses 1208 and 1209 on the first and second sintered body type 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, and is converted into parallel beams. The fluorescent light obtained by the wavelength conversion by the phosphor wheel 2a is optimized in its own wavelength band so as to form white light by combining with the blue light emitted from the laser light source 1201.

[0145] 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 polarization and color separation synthesis mirror 1206 arranged at an angle of 45 degrees with respect to the optical axis. As described above, the polarization and color separation synthesis mirror 1206 has the characteristic of transmitting light in the wavelength band of the fluorescence, and thus the fluorescence is transmitted without changing the direction of the light, and the fluorescence is incident on the convex lens 1210 at the subsequent stage.

[0146] 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.

[0147] The blue light, which is collimated by the convex lenses 1209 and 1208, is incident on the subsequent λ / 4 wavelength plate 1207, where its polarization direction is rotated and converted into P-polarized light and emitted.

[0148] The P-polarized light in the blue wavelength band emitted through the λ / 4 wavelength plate 1207 enters the polarization and color separation synthesis mirror 1206 arranged at an angle of approximately 45 degrees with respect to the optical axis. The polarization and color separation synthesis mirror 1206 has the characteristic of reflecting the S-polarized light in the blue wavelength band emitted from the laser light source 1201 and transmitting 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 obtained by wavelength conversion by the fluorescent material wheel 2a. Therefore, the P-polarized light in the blue wavelength band emitted through the λ / 4 wavelength plate 1207 passes through as it is without changing the traveling direction of the light, and enters the convex lens 1210 of the subsequent stage.

[0149] According to the rotation of the fluorescent wheel 2a, the fluorescent light and the blue light are incident on the convex lens 1210 in a time series, and are converged near the incident end of the optical integrator rod 1212 described later. The light converged 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 fluorescent wheel according to the first embodiment, and the fluorescent wheel 2a and the wheel with a color filter 1211 rotate synchronously, so that light with different wavelength bands is converged in a time series near the incident end of the optical integrator rod 1212.

[0150] The light having different wavelengths and time divisions incident on the optical integrator rod 1212 is uniformed by the optical integrator rod 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 optical integrator rod, but it may be arranged near the emission side.

[0151] <Effect>

[0152] In the light source device 12 according to the sixth embodiment, excellent conversion efficiency and heat resistance can be obtained by using the phosphor wheel 2a according to the second embodiment. Alternatively, the phosphor wheel 2c according to the fourth embodiment may be used instead of the phosphor wheel 2a according to the second embodiment.

[0153] [3-2 Projection type image display device]

[0154] Hereinafter, details of the projection type image display device 15 equipped with the light source device 12 according to the sixth embodiment will be described. Fig.11 This is a diagram showing a configuration of a projection type image display device 15 equipped with a light source device 12 according to the sixth embodiment.

[0155] In addition, the structure of the light source device 12 according to the sixth embodiment has been described above, so the description thereof is omitted here. Figure 8 The behavior of light emitted from the optical integrator rod 1111 described above is substantially the same, and thus the description thereof is omitted here.

[0156] <Effect>

[0157] In the projection type image display device 15 using the light source device 12 according to the sixth embodiment, the fluorescent substance wheel 2 a according to the second embodiment (or the fluorescent substance wheel 2 c according to the fourth embodiment) is used, and excellent conversion efficiency and heat resistance can be obtained.

[0158] In addition, the present disclosure includes a structure in which any of the various embodiments and / or examples described above are appropriately combined, and the effects possessed by the respective embodiments and / or examples can be exerted.

[0159] Industrial Applicability

[0160] According to the phosphor wheel according to the present disclosure, the first and second sintered body type wavelength conversion layers are adjacent to each other, thereby achieving excellent conversion efficiency and heat resistance.

[0161] Description of Reference Numerals

[0162] 2, 2a, 2b, 2c Phosphor wheel

[0163] 10a, 10b, 10c, 10d incision

[0164] 20a, 20b, 20c, 20d Stepped part

[0165] 201 substrate

[0166] 202 Adhesive layer

[0167] 204a, 204b, 214a, 214b: first sintered body type wavelength conversion layer

[0168] 205a, 205b, 215a, 215b Second sintered body type wavelength conversion layer

[0169] 206a, 206b opening

[0170] 208 Motor mounting hole

[0171] 210 Paste base

[0172] 211 Guide pin

[0173] 212a, 212b, 212c Guide pins

[0174] 213a, 213b Reflection area

[0175] 11 Light source device

[0176] 1101 Laser Light Source

[0177] 1102 Collimating lens

[0178] 1103 Convex lens

[0179] 1104 Diffuser Plate

[0180] 1105 Concave lens

[0181] 1106 Color Separation Synthesis Mirror

[0182] 1107 Convex lens

[0183] 1108 Convex lens

[0184] 309 Motor

[0185] 1109 Convex lens

[0186] 1110 Wheel with color filter

[0187] 1111 Optical Integrator Rod

[0188] 1121 Convex lens

[0189] 1122 Convex lens

[0190] 1123 Reflector

[0191] 1124 Convex lens

[0192] 1125 Reflector

[0193] 1126 Convex lens

[0194] 1127 Reflector

[0195] 1128 Convex lens

[0196] 12 Light source device

[0197] 1201 Laser Light Source

[0198] 1202 Collimating lens

[0199] 1203 Convex lens

[0200] 1204 Diffuser Plate

[0201] 1205 Concave lens

[0202] 1206 Polarization and color separation synthesis mirror

[0203] 1207 λ / 4 Wavelength Plate

[0204] 1208 Convex lens

[0205] 1209 Convex lens

[0206] 409 Motor

[0207] 1210 Convex lens

[0208] 1211 Wheel with color filter

[0209] 1212 Optical Integrator Rod

[0210] 14 Projection type image display device

[0211] 1401 Convex lens (relay lens)

[0212] 1402 Convex lens (relay lens)

[0213] 1403 Convex lens (relay lens)

[0214] 1411 Total Reflection Prism

[0215] 1412 Tiny Gap

[0216] 1421 DMD

[0217] 1431 Projection lens

[0218] 15 Projection type image display device

[0219] R1, r1 inner diameter

[0220] R2, r2 outer diameter.

Claims

1. A fluorescent wheel comprising: A substrate capable of rotating; a plurality of wavelength conversion layers arranged on the substrate, wherein a first sintered body type wavelength conversion layer and a second sintered body type wavelength conversion layer are arranged adjacent to each other in a circumferential direction centered on a rotation center of the substrate, the first sintered body type wavelength conversion layer having a sintered body of first wavelength conversion particles that converts the wavelength of excitation light into light of a first wavelength, and the second sintered body type wavelength conversion layer having a sintered body of second wavelength conversion particles that converts the wavelength of the excitation light into light of a second wavelength different from the first wavelength; and an adhesive layer disposed between the substrate and the plurality of wavelength conversion layers, At the boundary between the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, the first sintered body type wavelength conversion layer has a portion at an end in the circumferential direction that is not in contact with an end in the circumferential direction of the second sintered body type wavelength conversion layer.

2. The phosphor wheel according to claim 1, wherein: The non-contacting portion is a notch provided at an end portion of the first sintered body type wavelength conversion layer.

3. The phosphor wheel according to claim 1, wherein: The non-contacting portion is a missing portion provided on at least one of the inner diameter side and the outer diameter side of the end portion of the first sintered body type wavelength conversion layer.

4. The phosphor wheel according to claim 1, wherein: The first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer have different at least one of an inner diameter and an outer diameter from a rotation center of the substrate at the adjacent boundary.

5. The phosphor wheel according to claim 1, wherein: The first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer have different widths in a radial direction around a rotation center of the substrate at the adjacent boundary.

6. The phosphor wheel according to claim 1, wherein: The end surface of the first sintered body type wavelength conversion layer facing the second sintered body type wavelength conversion layer extends toward the inner circumference from a portion where the end surface of the second sintered body type wavelength conversion layer facing the first sintered body type wavelength conversion layer is in contact with the inner circumference. The end surface at the end portion of the second sintered body type wavelength conversion layer extends toward the outer peripheral side from a portion in contact with the end surface at the end portion of the first sintered body type wavelength conversion layer on the outer peripheral side.

7. The phosphor wheel according to claim 1, wherein: The adhesive layer is exposed between the non-contacting portion of the first sintered body type wavelength conversion layer and an end portion of the second sintered body type wavelength conversion layer.

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

9. 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. 10 . A light source device comprising the fluorescent substance wheel according to claim 1 . 11 . A projection type image display device comprising the light source device according to claim 10 .

12. A method for manufacturing a phosphor wheel, comprising: The process of applying an adhesive layer to a substrate; A step of disposing a first sintered body type wavelength conversion layer and a second sintered body type wavelength conversion layer adjacent to each other on the substrate, the first sintered body type wavelength conversion layer having a sintered body of first wavelength conversion particles that convert the wavelength of the excitation light into light of a first wavelength, and the second sintered body type wavelength conversion layer having a sintered body of second wavelength conversion particles that convert the wavelength of the excitation light into light of a second wavelength different from the first wavelength; and a step of curing the adhesive layer to fix the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer to the substrate, In the process of configuring the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, the first sintered body type wavelength conversion layer is configured to have a portion at the circumferential end portion of the second sintered body type wavelength conversion layer at the adjacent boundary between the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, which is not connected to the circumferential end portion of the second sintered body type wavelength conversion layer.

13. The method for manufacturing a fluorescent wheel according to claim 12, wherein: In the process of configuring the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer, guide pins for position alignment are provided adjacent to the non-contacting portions, the substrate and the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer are relatively moved along the guide pins in a direction perpendicular to the surface of the substrate, and the first sintered body type wavelength conversion layer and the second sintered body type wavelength conversion layer are configured at the portion of the substrate coated with the adhesive layer.

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