Light source device and projection device

Abstract

The present invention provides a light source device and a projection device. A light source device has a simple structure and does not generate gaps between phosphors. In addition, a projection display device capable of obtaining higher illumination can be provided. A fluorescent wheel having an incident surface on which the emitted light of a semiconductor light source is incident has a first segment area and a second segment area adjacent to each other arranged in a circumferential direction on a reflective substrate, and a segment forming layer corresponding to each segment area is applied. The lower layer of the second segment area is the phosphor layer of the first segment area, and the upper layer is a phosphor layer or a diffusion layer of a specified size. Thus, gaps are prevented from being generated between the segment areas, thereby preventing the reflective substrate from being exposed.

Description

Technical Field

[0001] The invention relates to a light source device and a projection device. Background Art

[0002] In recent years, a small projection type display device that performs color display has been developed. If a light source that emits each primary color light of R, G, and B is used for color display, it is difficult to achieve miniaturization of the entire projection device, and the cost becomes high. Therefore, it is proposed to use a light source device that irradiates an excitation light to a fluorescent wheel having a fluorescent layer formed on a rotating plate, and emits light containing R, G, and B from the fluorescent wheel (for example, Patent Document 1).

[0003] Patent document 1 describes a light source device that uses a fluorescent wheel having a plurality of fluorescent layers, and a fluorescent wheel having a red fluorescent layer, a green fluorescent layer, and a blue fluorescent layer. The fluorescent layers emitting various colors are arranged in sections as fluorescent light emitting areas in the circumferential direction of a circular light emitting plate. The fluorescent layers of various colors are formed by coating in predetermined areas on a metal substrate using a screen printing technique. A solid light source emitting ultraviolet light is used as an excitation light source for exciting each fluorescent layer.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-108502 Summary of the invention

[0007] [Problems to be solved by the invention]

[0008] However, in view of heat dissipation, support and cost, a metal substrate is often used as a substrate for a fluorescent wheel. Therefore, when the substrate and the fluorescent layer are combined, a combination with a large difference in thermal expansion coefficient is obtained. In addition, the fluorescent layer generates heat due to the excitation light. Therefore, when the fluorescent wheel is continuously irradiated with the excitation light, the fluorescent layer and the metal substrate are heated and expand.

[0009] For example Fig.11 (A) shows a fluorescent wheel 90 obtained by coating a yellow fluorescent layer 92 and a red fluorescent layer 93 in two regions along the circumferential direction on a metal substrate 91. The fluorescent wheel 90 expands and contracts due to the heat of the metal substrate 91. Fig.11 As shown in (B), a gap 94 is generated in the boundary region C between the plurality of phosphor layers. In the gap 94, as shown in FIG. Fig.12 As shown in (A), the metal substrate 91 of the base is exposed. Therefore, the incident light L91 is reflected to generate reflected light L94. That is, a problem occurs in that light components other than the fluorescence from the fluorescent material layers 92 and 93 are generated.

[0010] To solve this problem, Fig.12 As shown in (B), it is considered that one phosphor layer (in this conventional example, the yellow phosphor layer 92) is partially overlapped on another phosphor layer (in this conventional example, the red phosphor layer 93) in the boundary area C. However, it is difficult to control the overlap amount of the overlapping portion 92a. Therefore, it becomes difficult to balance the primary color lights R, G, and B contained in the light emitted from the light source device. That is, the deviation in product quality of each product of the fluorescent wheel becomes larger, and the product yield rate decreases.

[0011] The present invention has been made in view of the above conventional situation, and an object of the present invention is to provide a light source device that does not generate gaps between segments of a fluorescent wheel and improves product yield with a simple structure.

[0012] According to another viewpoint, an object is to provide a projection display device capable of obtaining higher illumination.

[0013]

Methods used to solve the problem

[0014] In order to achieve the above object, the invention of the light source device according to the first aspect is characterized in that the light source device comprises:

[0015] a semiconductor light source; and a fluorescent wheel having an incident surface on which the emitted light of the semiconductor light source is incident,

[0016] The fluorescent wheel comprises a supporting substrate and a plurality of segment forming layers, wherein the supporting substrate is rotatable around a rotation axis and has a plurality of segment regions arranged on its incident surface side, and the plurality of segment forming layers correspond to the plurality of segment regions arranged on the incident surface side of the supporting substrate.

[0017] The support substrate is formed of a metal material and has a reflective flat surface extending in a circumferential direction with respect to the rotation axis on the incident surface side.

[0018] The plurality of segment regions at least include a first segment region and a second segment region adjacent to each other in a circumferential direction centered on the rotation axis, the plurality of segment forming layers include a first segment forming layer disposed in the first segment region and a second segment forming layer disposed in the second segment region, and the first segment forming layer and the second segment forming layer are continuously formed without a gap,

[0019] In the first segment region, the first segment forming layer is formed on the flat surface, and the first segment forming layer is a first phosphor layer formed by dispersing a first phosphor in a resin binder, wherein the first phosphor uses the emitted light from the semiconductor light source as excitation light and emits light of a wavelength different from the excitation light.

[0020] In the second segment region, the second segment forming layer is formed on the flat surface, the second segment forming layer having a lower layer on the support substrate side and an upper layer stacked on the lower layer,

[0021] The first phosphor layer extends to become the lower layer,

[0022] The upper layer is a second phosphor layer formed by dispersing a second phosphor in a resin binder or a diffusion layer formed by dispersing a diffusion material in a resin binder, wherein the second phosphor uses the emitted light from the semiconductor light source as excitation light and emits light of a wavelength different from the excitation light and the emitted light from the first phosphor, and the diffusion material diffuses the emitted light from the semiconductor light source.

[0023] The width of an irradiated region on the incident surface of the fluorescent wheel irradiated by the emitted light from the semiconductor light source is smaller than the width of the flat surface and the width of the first fluorescent layer in a radial direction centered on the rotation axis.

[0024] In addition, the invention of the light source device according to claim 2 is characterized in that the light source device comprises:

[0025] a semiconductor light source; and a fluorescent wheel having an incident surface on which the emitted light of the semiconductor light source is incident,

[0026] The fluorescent wheel comprises a supporting substrate and a plurality of segment forming layers, wherein the supporting substrate is rotatable around a rotation axis and has a plurality of segment regions arranged on its incident surface side, and the plurality of segment forming layers correspond to the plurality of segment regions arranged on the incident surface side of the supporting substrate.

[0027] The support substrate is formed of a metal material and has a reflective flat surface extending in a circumferential direction with respect to the rotation axis on the incident surface side.

[0028] The plurality of segment regions at least include a first segment region and a second segment region adjacent to each other in a circumferential direction centered on the rotation axis, the plurality of segment forming layers include a first segment forming layer disposed in the first segment region and a second segment forming layer disposed in the second segment region, and the first segment forming layer and the second segment forming layer are continuously formed without a gap,

[0029] In the first segment region, the first segment forming layer is formed on the flat surface, and the first segment forming layer is a first phosphor layer formed by dispersing a first phosphor in a resin binder, wherein the first phosphor uses the emitted light from the semiconductor light source as excitation light and emits light of a wavelength different from the excitation light.

[0030] In the second segment region, the second segment forming layer is formed on the flat surface, the second segment forming layer having a lower layer on the support substrate side and an upper layer stacked on the lower layer,

[0031] The first phosphor layer extends to become the upper layer,

[0032] The lower layer is a second phosphor layer formed by dispersing a second phosphor in a resin binder or a diffusion layer formed by dispersing a diffusion material in a resin binder, wherein the second phosphor uses the emitted light from the semiconductor light source as excitation light and emits light of a wavelength different from the excitation light and the emitted light from the first phosphor, and the diffusion material diffuses the emitted light from the semiconductor light source.

[0033] The width of an irradiated region on the incident surface of the fluorescent wheel irradiated by the emitted light from the semiconductor light source is smaller than the width of the flat surface and the width of the first fluorescent layer in a radial direction centered on the rotation axis.

[0034] Here, it is preferable that the second segment regions are formed in a radial shape with the rotation axis as the center, and are arranged at equal intervals in a circumferential direction with the rotation axis as the center.

[0035] In addition, it is preferred that the second segment area is formed radially with the rotation axis as the center, and the length of the second segment area in the circumferential direction with the rotation axis as the center is smaller than the length of the irradiated area on the incident surface of the fluorescent wheel irradiated by the outgoing light from the semiconductor light source in the circumferential direction with the rotation axis as the center.

[0036] Furthermore, it is preferable that the support substrate is a light reflective substrate including an aluminum substrate and a laminated film, wherein the laminated film includes a silicon oxide layer, a silver layer, and a titanium oxide layer in order from the aluminum substrate side on a surface on the incident surface side.

[0037] In addition, the second segment forming layer preferably arranged in the second segment area is a stacked film of the first phosphor layer and the second phosphor layer, and the first phosphor layer preferably receives a portion of the light from the second phosphor emitted by the second phosphor layer when the second phosphor layer is excited by the outgoing light from the semiconductor light source and emits light.

[0038] Preferably, the fluorescent wheel further includes a third segment region in the circumferential direction around the rotation axis, and a third fluorescent layer is formed in the third segment region. The third fluorescent layer is formed by dispersing a fluorescent material different from the fluorescent materials used in other segment regions in a resin binder.

[0039] Furthermore, it is preferred that the fluorescent wheel has an opening formed in the support substrate in a circumferential direction around the rotation axis, and a transmissive diffusion material is provided on the fluorescent wheel at a position where the emitted light from the semiconductor light source passes through the opening.

[0040] The semiconductor light source is preferably a semiconductor laser light source that emits light with a wavelength in the blue region.

[0041] In addition, the invention of the projection device described in claim 10 is characterized in that it comprises: the light source device described in any one of claims 1 to 9;

[0042] A color component separation unit, into which light emitted from the light source device is incident, and the color component separation unit separates the light into three primary colors of R, G, and B;

[0043] a projection optical system for performing projection using the light from the color component separation section;

[0044] a light source device control unit that controls the light source device; and

[0045] The projection device control unit controls the projection optical system to generate a predetermined projection image using the light from the color component separation unit.

[0046] [Effects of the Invention]

[0047] According to the invention described in the first and second aspects, in the second segment region of the fluorescent wheel, the second segment forming layer is a laminated structure, and one of the layers, the first segment forming layer for the first segment region, is formed continuously from the first segment region. Therefore, even when the fluorescent wheel expands and contracts due to heat, it is possible to achieve the effect of not generating a gap in the boundary region between the first segment region and the second segment region. In addition, since the second segment forming layer is formed as a laminated structure, it is not necessary to Fig.11 Therefore, it can be manufactured with a simple structure and the manufacturing yield rate can be improved.

[0048] In addition, according to the invention described in claim 10, since there is no gap in the boundary area between the first segment area and the second segment area of ​​the fluorescent wheel, even when a laser light source is used as an excitation light source, there will be no undesirable situation that the irradiated laser light source light is directly reflected by the metal substrate. Fig.11 Compared with the case of the light source device in which a gap is easily generated as shown, a stronger light can be used as the excitation light. Therefore, there is an effect that a projection type display device capable of obtaining a higher illumination can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1It is a diagram showing a configuration example of a projector (projection device) according to an embodiment of the present invention.

[0050] Figure 2 is decomposed into Figure 1 A perspective view of a light source device used in a projector.

[0051] Figure 3 It means in Figure 2 1 is a diagram showing an example of a fluorescent wheel according to a first embodiment used in a light source device of the present invention, wherein (A) is a plan view and (B) is a cross-sectional view taken along line AA.

[0052] Figure 4 This is a cross-sectional view along the radius of the first region of the fluorescent wheel used in the light source device according to the third embodiment of the present invention.

[0053] Figure 5 These are diagrams showing an example of a fluorescent wheel used in a light source device according to a fourth embodiment of the present invention. (A) is a plan view, and (B) is a BB line cross-sectional view.

[0054] Figure 6 It is a top view of a fluorescent wheel used in a light source device according to a fifth embodiment of the present invention.

[0055] Figure 7 It is a top view of a fluorescent wheel used in a light source device according to a sixth embodiment of the present invention.

[0056] Figure 8 It is a top view of a fluorescent wheel used in a light source device according to a seventh embodiment of the present invention.

[0057] Fig. 9 It is a diagram for explaining a projection device 50 according to a ninth embodiment.

[0058] Fig.10 It is a decomposition representation Fig. 9 A perspective view of a light source device used in.

[0059] Fig.11 This is a diagram showing an example of a fluorescent wheel for explaining the subject of the present invention.

[0060] Fig.12 Yes means Fig.11 A sectional view of a main part of a fluorescent wheel taken along the circumferential direction of the fluorescent wheel.

[0061] Description of symbols

[0062] 1.60,61,62,63,64,65,66..Light source device

[0063] 2...Fluorescent wheel

[0064] 2a...Incident surface

[0065] 3...Semiconductor light source

[0066] 4...Motor

[0067] 4a...Rotating part

[0068] 5. Color component separation section

[0069] 6...Projection optical system

[0070] 7...Light source device control unit

[0071] 8...Projection device control unit

[0072] 9...Projection device (projector)

[0073] 10...Support base plate

[0074] 10a...Shaft mounting hole

[0075] 10b...Peripheral area

[0076] 12...Flat surface

[0077] 13...Upper bearing plate (rotational balance adjustment bearing)

[0078] 14...Lower bearing plate (optional)

[0079] 20...Sector Area

[0080] 21...Segment 1 area

[0081] 22...Sector 2

[0082] 23...Sector 3

[0083] 30...Segment formation

[0084] 31...Section 1 Cambium

[0085] 32...Second Section Formation

[0086] 33...Reflective coating

[0087] 34...1st phosphor layer

[0088] 35...Second phosphor layer (diffusion layer)

[0089] 40...Irradiation area

[0090] AX...Rotation axis DETAILED DESCRIPTION

[0091] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0092] (Projection device)

[0093] First, a projection device using the light source device of the present invention will be described. Figure 1 The projector is an image projection device that projects a screen of a personal computer or a video image onto a screen. The projector 9 includes a light source device 1, a color component separation unit 5, and a projection optical system 6. Furthermore, the projector 9 includes: a light source device control unit 7, which controls the light source device as a functional block; and a projection device control unit 8, which controls the projection optical system 6 and generates a predetermined projection image using the light from the color component separation unit 5.

[0094] The light source device 1 needs a light source that can emit high-brightness light. In this embodiment, it is provided with a fluorescent wheel 2 as a light-emitting plate, a semiconductor light source 3 that irradiates excitation light to a fluorescent layer formed on the fluorescent wheel 2, and a motor 4 that rotates the fluorescent wheel 2. By increasing the amount of excitation light irradiated to the fluorescent layer, the illuminance of the light in the fluorescent layer can be increased. In the figure, an example of using one semiconductor light source 3 is illustrated, but the present invention is not limited to this. For example, if a plurality of semiconductor light sources are used, a higher illuminance can be obtained.

[0095] The irradiation light L1 from the semiconductor light source 3 to the fluorescent wheel 2 is condensed by a condenser lens (not shown), or is parallelized by a collimating lens. Therefore, it is preferred to use spot light that irradiates a specified irradiation area. In the case where a plurality of semiconductor light sources are used in the light source device 1, it is preferred that the light from the plurality of light sources is incident on the same condenser lens or collimating lens. In addition, an optical fiber may also be used for this purpose.

[0096] Fluorescence is emitted from the fluorescent layer of the fluorescent wheel 2 irradiated with the excitation light. The details of the fluorescent wheel 2 will be described later. The fluorescent wheel 2 is formed by forming a fluorescent layer on a support substrate 10 made of a metal material. The fluorescence is included in the reflected light L2 from the fluorescent wheel 2. The reflected light L2 is guided to the color component separation unit 5. A condenser lens (not shown) is provided between the reflected light L2 and the color component separation unit 5.

[0097] The phosphor layer provided on the phosphor wheel 2 includes a plurality of phosphors which emit light of different wavelength regions when excited by the excitation light from the semiconductor light source 3. The reflected light from the phosphor wheel 2 becomes reflected light L2 of a composite color of the wavelength region of the three primary colors of R, G, and B.

[0098] The color component separation unit 5 is an optical system that separates the reflected light L2 into three primary colors of R, G, and B, and emits the light of each primary color area to the projection optical system 6. The reflected light L2 is first reflected by the total reflection mirror M1, and then toward the reflection mirrors M2, M3, and M4. The reflection mirrors M2 and M3 are dichroic mirrors that reflect light of a specific wavelength and allow light of other wavelengths to pass through. The reflection mirror M2 reflects the light component of the blue wavelength area, and the reflection mirror M3 reflects the light component of the green wavelength area. Each reflection mirror transmits light of other wavelengths. Therefore, the light component mainly in the red wavelength area after removing the light component of the blue wavelength area and the light component of the green wavelength area reaches the reflection mirror M4 and is reflected. The light of the blue component reflected by the reflection mirror M2 is reflected by the reflection mirror MB and emits light LB. The light of the green component reflected by the reflection mirror M3 is reflected by the reflection mirror MG and emits light LG. The light of the red component reflected by the reflection mirror M4 is reflected by the reflection mirror MR and emits light LR. The light beams LR, LG, and LB are separated into three primary colors of R, G, and B. The reflectors MR, MG, and MB are reflectors for adjusting the traveling direction of the light beams LR, LG, and LB so as to direct the traveling direction of the light beams LR, LG, and LB toward the projection device 6 .

[0099] The projection optical system 6 includes at least a light spatial modulator (not shown) and a projection lens for projecting the light modulated by the light spatial modulator onto a front screen. The light spatial modulator is, for example, an MD device (Micromirror Device) composed of a large number of micromirrors. Three MD devices are provided corresponding to each of the light LR, LG, and LB, and each MD device controls the angle of each micromirror to a specified mirror angle according to an output signal from the projection device control unit 8. By controlling each micromirror, each light LR, LG, and LB incident on the projection optical system 6 is reflected at a specified angle, so that a desired image can be projected. The projection lens is a lens for magnifying and projecting the light modulated by the light spatial modulator onto a front screen, and has a single lens or multiple lenses.

[0100] (First embodiment)

[0101] Next, a plurality of embodiments of the light source device 1 will be described. Figure 2 and Figure 3 The light source device according to the first embodiment will be described.

[0102] (Light source device)

[0103] First, the light source device 4 will be described. Figure 2 is a perspective view showing an exploded light source device. Figure 3 It means in Figure 2FIG. 1 is a diagram showing an example of a fluorescent wheel used in a light source device. The light source device 1 includes a fluorescent wheel 2 that can rotate around a rotation axis Ax, a motor 4 that is located on the rotation axis Ax and rotates the fluorescent wheel 2, and a semiconductor light source 3. The semiconductor light source 3 emits light that reaches an incident surface 2a of the fluorescent wheel 2. The motor 4 and the semiconductor light source 3 are controlled by an output signal from a light source device control unit 7. Specifically, the rotation drive of the motor 4 and the lighting state of the semiconductor light source 3 are controlled. The incident light L1 that reaches the incident surface 2a of the fluorescent wheel 2 becomes a point light with a diameter of a predetermined size and illuminates an irradiation area 40.

[0104] (Fluorescent wheel)

[0105] exist Figure 2 and Figure 3 In the example of FIG. 1 , the fluorescent wheel 2 includes a fluorescent layer on the incident surface 2a of the supporting substrate 10 formed of a metal disk. The fluorescent layer is composed of a first fluorescent layer 34 provided in an annular shape on the outer peripheral region 10b of the incident surface 2a, and a second fluorescent layer 35 provided in a plurality of places so as to partially and radially cover the first fluorescent layer 34.

[0106] The supporting substrate 10 has a reflecting surface on the incident surface 2a side, and the supporting substrate 10 is formed of a metal material having a thickness that does not deform due to rotation and can maintain the phosphor layer. As the metal material, from the viewpoint of heat dissipation, metal materials such as aluminum, molybdenum, copper, Cu-W alloy, Cu-Mo alloy, etc. with a thermal conductivity greater than 150 (W / m·K) are preferred. Brass, iron, and stainless steel with a thermal conductivity of about 100 (W / m·K) can also be used. This is because even in the case of a thermal conductivity of 100 (W / m·K), it has a higher thermal conductivity than the thermal conductivity of glass of 1 (W / m·K). The size of the supporting substrate 2 is, for example, a radius of about 2 cm and a thickness of 0.5 mm.

[0107] A shaft mounting hole 10a is formed in the central portion of the support substrate 10 intersecting the rotation axis Ax. The shaft mounting hole 10a is a hole having an inner diameter of a size for the rotating portion 4a of the motor 4 to fit in. The lower bearing plate 14, the support substrate 10, and the upper bearing plate 13 are sequentially fitted and fixed to the rotating portion 4a of the motor 4. In a state where the support substrate 10 is clamped between the lower bearing plate 14 and the upper bearing plate 13, the lower bearing plate 14 and the upper bearing plate 13 are combined and fixed to the rotating portion 4a of the motor. On the upper bearing plate 13, an adhesive as a balancer (weight) is provided as needed, and the adhesive also serves as a rotation balance adjustment bearing portion for adjusting so that the rotation balance of the fluorescent wheel 2 does not deviate. The lower bearing plate 14 and the upper bearing plate 13 are made of a metal material, and a member with a smaller diameter than the support substrate 10 is used. In the case where the fluorescent wheel 2 can be fixed at a predetermined position without shaking, the lower bearing plate 14 can also be omitted. The motor 4 is located on the surface side opposite to the incident surface 2 a of the fluorescent wheel 2 .

[0108] A phosphor layer is provided in the peripheral region 10b on the incident surface 2a side of the support substrate 10, that is, in a region closer to the periphery than 1 / 2 of the radius to the peripheral side surface of the support substrate centered on the rotation axis Ax. The region of the surface of the support substrate 10 corresponding to the position where the phosphor layer is provided is a smooth flat surface 12. The flat surface 12 is a polished surface in order to improve reflectivity and is provided in the peripheral region 10b.

[0109] The first phosphor layer 34 is formed into a phosphor layer of a certain thickness by printing and curing a coating agent, wherein the coating agent is obtained by dispersing phosphor particles that emit fluorescence in red and green regions when excited by light from the semiconductor light source 3 in a silicone resin adhesive. The first phosphor layer 34 can also be obtained by mixing and dispersing phosphor particles that emit fluorescence in the red region and phosphor particles that emit fluorescence in the green region. The second phosphor layer 35 is a phosphor layer obtained by dispersing phosphor particles composed of a second phosphor that emits fluorescence in the blue region when excited by light from the semiconductor light source 3 in a silicone resin adhesive. Figure 3 In the example of , the second phosphor layer 35 is arranged at 10 locations at equal intervals, and is formed so as to straddle the first phosphor layer 34 in the radial direction. The second phosphor layer 35 can be formed by coating using a dispenser, for example.

[0110] In addition, in this embodiment, unless otherwise specified, the case where one type of phosphor is dispersed in a resin binder and the case where two or more types of phosphors are mixed and dispersed in a resin binder are not distinguished, and the entire phosphor contained in the first phosphor layer 34 is defined as the first phosphor. Similarly, the phosphor contained in the second phosphor layer 35 is defined as the second phosphor regardless of the type of phosphor.

[0111] The region where the first phosphor layer 34 and the second phosphor layer 35 are provided is composed of a plurality of segment regions 20 in a plan view. A segment formation layer 30 including at least the first phosphor layer 34 is formed on the plurality of segment regions 20. Figure 3 As shown in the right region II in the cross-sectional view of (B), the first segment region 21 is a region where the first phosphor layer 34 is formed on the support substrate 10. Figure 3 As shown in the left area I in the cross-sectional view of (B), the second segment area 22 is an area where the first phosphor layer 34 and the second phosphor layer 35 are formed on the supporting substrate 10. Specifically, a plurality of second segment areas 22 (formed in a radial shape) are formed at equal intervals around the rotation axis Ax and in the circumferential direction around the rotation axis Ax. In the present invention, at the boundary that divides the first segment area 21 and the second segment area 22, the first phosphor layer 34 is formed continuously with the first segment area 21 and the second segment area 22. That is, it is configured so that there is no area where no phosphor layer exists at the boundary between the two. Therefore, the first segment area 21 and the second segment area 22 are continuously formed adjacent to each other without a gap.

[0112] When the fluorescent wheel 2 rotates at a predetermined angle around the rotation axis Ax to draw an arc, the first segment area 21 and the second segment area 22 are located on the circumference. When the predetermined area on the circumference is irradiated with light from the semiconductor light source 3, the light emitted from the first segment area 21 and the light emitted from the second segment area 22 are alternately reflected. By rotating the fluorescent wheel 2 at a high speed, a reflected light L2 of a composite color of the light emitted from the first segment area 21 and the light emitted from the second segment area 22 is obtained. The hue of the reflected light L2 can be adjusted by the area ratio of the first segment area 21 to the second segment area 22, the type and concentration of the phosphor used for the first phosphor layer 34 and the second phosphor layer 35, and the like.

[0113] The first phosphor layer 34 is a ring-shaped layer with a uniform thickness. Its radial width W1 is larger than the spot diameter of the irradiation area 40 of the incident light L1. W40 is large. The width W1 is 1.5 to 2 times the size of the irradiation area of ​​the incident light L1 on the first phosphor layer 34. Specifically, as an example, the spot diameter W40 is set to 2 mm to 3 mm, and the radial width W1 of the first phosphor layer 34 is set to 4 mm. As for the thickness, it is 150 μm in the present embodiment. The radial width W1 of the first phosphor layer 34 is smaller than the radial width W2 of the flat surface 12 (peripheral area 10b). The fluorescence emitted from the first phosphor layer 34 is emitted as diffuse light. At this time, by making the flat surface 12 wider than the first phosphor layer 34, for example, light of the supporting substrate 10 toward the side close to the rotation axis Ax (toward the axis) is reflected by the flat surface 12 and can be directed toward a focusing lens not shown.

[0114] The first phosphor layer 34 located in the first segment region 21 corresponds to the first segment formation layer 31 in the present invention.

[0115] The second phosphor layer 35 has a radial width greater than that of the first phosphor layer 34 in order to cross over and cover the first phosphor layer 34, and a portion of the second phosphor layer 35 is in contact with the flat surface 12, and a portion of the second phosphor layer 35 is directly stacked on the first phosphor layer 35. The circumferential width W3 of the second phosphor layer 35 is greater than the size of the irradiation area of ​​the incident light L1. Specifically, the second segment area 22 is formed radially around the rotation axis Ax, and the circumferential length (W3) around the rotation axis Ax is smaller than the length W40 of the light irradiation area 40. Light is emitted from the semiconductor light source 3 and irradiates the incident surface 2a of the fluorescent wheel 2 in the circumferential direction around the rotation axis Ax. Figure 3 As shown in FIG. 5 (B), the lower layer on the support substrate 10 side is the first phosphor layer 34 , and the upper layer is the second phosphor layer 35 .

[0116] The thickness of the second phosphor layer 35 is formed to be the same as or thinner than the thickness of the first phosphor layer 34. By setting the thickness to be less than or equal to the thickness of the first phosphor layer 34, it is also easy to generate excitation light that is not absorbed by the second phosphor layer 35 and reaches the first phosphor layer 34. If there is excitation light reaching the first phosphor layer 34 in the second segment area 22, not only the fluorescence from the second phosphor layer 35 but also the fluorescence from the first phosphor layer 34 can be used, thereby improving the utilization efficiency of the excitation light. Specifically, as an example, the width of the second phosphor layer 35 in the radial direction is set to 6 mm, the width in the circumferential direction is set to 1 mm, and the thickness is set to 100 μm.

[0117] The structure in which the second phosphor layer 35 is stacked on the first phosphor layer 34 located in the second segment region 22 corresponds to the second segment formation layer 32 in the present invention.

[0118] In the present embodiment, a plurality of second phosphor layers 35 are stacked locally and evenly spaced on the first phosphor layer 34 formed in an annular shape. That is, the segment forming layer 30 in which the first segment forming layer 31 and the second segment forming layer 32 are alternately provided alternately has a region consisting only of the first phosphor layer 34 and a region in which the first phosphor layer 34 and the second phosphor layer 35 are stacked. By adopting such a structure, the first phosphor layer 34 is always formed in all boundary portions between the segments. Therefore, even in the case of thermal expansion and contraction, no gap is generated at the boundary. In addition, since no gap is generated, direct reflection will not occur at this place, and a semiconductor laser light source with higher energy than a light emitting diode can be used as the semiconductor light source 3. A higher illumination can be obtained.

[0119] For example, the following phosphors can be used as the first phosphor included in the first phosphor layer 34. However, the phosphors are not limited to these phosphors, and any one or more of various phosphors that emit fluorescence including light in the wavelength region of the three primary colors of R, G, and B when excited by excitation light can be used in combination.

[0120] As a fluorescent substance that emits fluorescence in the yellow region, Y 3 Al 5 O 12 :Ce 3+ (YAG), (Sr,Ba) 2 SiO 4 :Eu 2+ 、Cax(Si,Al) 12 (O,N) 16 :Eu 2+ As a fluorescent substance emitting fluorescence in the yellow-green region, Lu 3 Al 5 O 12 :Ce, as a fluorescent substance emitting green fluorescence, Y 3 (Ga,Al) 5 O 12 :Ce 3+ , Ca 3 Sc 2 Si 3 O 12 :Ce 3+ ,CaSc 2 O 4 :Eu 2+ 、(Ba,Sr) 2 SiO 4 :Eu 2+ , Ba 3 Si 6 O 12 N 2 :Eu2+ 、(Si,Al) 6 (O, N): Eu2+, etc. As a phosphor that emits fluorescence in the red region, (Sr, Ca)AlSiN 3 :Eu, CaAlSiN 3 :Eu, SrAlSiN 3 :Eu, (Ba, Sr, Ca) 2 Si 5 N 8 :Eu, (Sr,Ca)S:Eu, Ca-α sialon, 0.5MgF 2 / 3.5MgO·GeO 2 :Mn、SrLiAl 3 N 4 :Eu, K 2 SiF 6 :Mn, CaAlSiN 3 :Eu 2+ , Ca 2 Si 5 N 8 :Eu 2+ ,La 2 O 2 S:Eu 3+ , KSiF 6 :Mn 4+ , KTiF 6 :Mn 4+ .

[0121] As with the first phosphor, any one or more of various phosphors may be mixed and used as the second phosphor included in the second phosphor layer 35. However, in the present invention, the second phosphor has a fluorescence spectrum distribution different from that of the first phosphor.

[0122] As the resin binder contained in the first phosphor layer 34 and the second phosphor layer 35 , a resin material having a high transmittance in the wavelength region of the excitation light and the fluorescence, such as acrylic resin, may be used in addition to silicone resin.

[0123] For example, the second segment forming layer 32 uses YAG:Ce as the phosphor contained in the first phosphor layer 34 located at the lower side, and uses SCASN phosphor ((Sr, Ca)AlSiN 3:Eu and the like as the basic composition) as the phosphor contained in the second phosphor layer 35 located on the upper side. At this time, a blue laser light source is used as the semiconductor light source 3, and the blue laser is used to excite the SACSN phosphor contained in the second phosphor layer 35. Here, the SACSN phosphor emits fluorescence in the red region. A portion of the blue laser passes through the second phosphor layer 35 and reaches YAG:Ce as the phosphor contained in the first phosphor layer 34. The YAG:Ce phosphor emits yellow fluorescence, and the fluorescence has a fluorescence spectrum with a peak between the red region and the green region. The SACSN phosphor can be excited not only by light in the blue region, but also by light in the blue-green region. Therefore, it can also be excited by the fluorescence emitted from YAG:Ce. In this way, as the material of the second phosphor layer 35 located on the upper side, if the following material is selected, the color conversion efficiency can be improved, and the material has an excitation spectrum of light obtained as a result of being excited by the fluorescence from the first phosphor layer 34 located on the lower side.

[0124] When the SACSN phosphor is excited, when the luminous quantum yield when the light in the blue region is used as the excitation light is compared with the luminous quantum yield when the light in the wavelength region of the fluorescence spectrum emitted from YAG:Ce is used as the excitation light, the luminous quantum yield when YAG:Ce is used is higher. As in the case of the SCASN phosphor as the phosphor layer located on the upper side, if a phosphor whose luminous quantum yield of the emission wavelength from the phosphor included in the lower layer is higher than the luminous quantum yield of the emission wavelength of the semiconductor light source 3 is used, the upper layer can be excited from the surface side by the semiconductor light source 3, and the fluorescence from the phosphor included in the lower layer can be excited from the lower side (the interface side with the lower layer). Therefore, the conversion efficiency of the upper layer can be further improved.

[0125] (Second embodiment)

[0126] In the first embodiment, as the second phosphor layer formed on the phosphor wheel 2, the second phosphor layer 35 mixed with the second phosphor is formed on the first phosphor layer 34, but in the second embodiment, a diffusion layer containing no phosphor is used. The other points are the same as those in the above embodiment, so the description is omitted here. Figure 3 , the second embodiment will be described, wherein reference numeral 35 is replaced by a diffusion layer.

[0127] like Figure 3As shown, the second segment region 22 includes a second segment forming layer 32 composed of a first phosphor layer 34 and a diffusion layer 35 covering the first phosphor layer 34. The first phosphor layer 34 is a ring-shaped layer of uniform thickness. The diffusion layer 35 is formed to cover the first phosphor layer 34 in a manner spanning the first phosphor layer 34. Specifically, after the first phosphor layer is applied and dried, the diffusion layer 35 is applied and formed.

[0128] The diffusion layer 35 is formed of a material in which a diffusion material composed of white inorganic ceramic particles as a diffusion material is dispersed in a resin binder such as silicone resin. As inorganic ceramics, titanium oxide, barium oxide, calcium carbonate, etc. are used. As the diffusion material, a material in which particles having a refractive index different from that of the resin binder are dispersed can also be used. For example, it is equivalent to a resin binder in which silicone resin is dispersed in a transparent resin binder such as polycarbonate resin, polystyrene resin, acrylic resin, etc. However, when a light source emitting light in the ultraviolet to blue region is used as the semiconductor light source 3, since the energy of the light is strong, the resin material is more likely to deteriorate than when light in the red region is used. Therefore, it is preferred to use inorganic ceramics as the diffusion material.

[0129] The diffusion layer 35 is formed on the reflective support substrate 10, and the diffusion layer 35 diffuses and reflects the incident light. Here, the semiconductor light source 3 used in the projection device 9 uses a semiconductor light source that emits visible light. In the second segment area 22, visible light is incident as incident light L1. A part of the incident light L1 is reflected by the diffusion layer 35, and a part is transmitted and reaches the first phosphor layer 34, and the first phosphor layer 34 emits fluorescence in the same way as the first segment area 31. The reflected light from the diffusion layer 35 contains the wavelength region component of the visible light emitted from the semiconductor light source. Therefore, it can be separated into the three primary colors of R, G, and B by the color component separation unit 5 of the projection device 9.

[0130] (Third embodiment)

[0131] use Figure 4 A third embodiment will be described. Figure 4 2 is a cross-sectional view along the radius of the first region of the fluorescent wheel 60. In the first embodiment, the fluorescent wheel 2 uses a metal material as the support substrate 10, and in order to improve the reflectivity, a flat surface 12 as a polished surface is formed in the outer peripheral region 10b. In this embodiment, a reflective coating is provided on the entire surface of the support substrate 10 on the incident surface 2a side, and a segment forming layer 30 is provided through the reflective coating, which is different from the first embodiment. In addition, Figure 4 In the figure, for the sake of convenience of explanation, the thickness of a part of the dimension in the thickness direction is exaggerated and illustrated.

[0132] Figure 4The fluorescent wheel 60 of (A) uses a white reflective layer obtained by dispersing white inorganic ceramic particles at a high concentration in silicone resin as the reflective coating layer 33. The white reflective layer is formed by printing technology. The reflective coating layer 33 is formed between the support substrate 10 and the first fluorescent layer 34. Figure 4 In the fluorescent wheel 61 of (B), the reflective coating 33 is a three-layer thin film reflective film formed by vacuum thin film forming technology such as vacuum evaporation or sputtering. For example, the reflective coating 33 is a laminated film in which a silicon oxide layer 33a as a base layer, a silver layer 33b as a metal reflective layer, and a titanium oxide layer 33c as a reflection enhancement film are sequentially formed on the support substrate 10. The reflective coating 33 is formed between the support substrate 10 and the first phosphor layer 34.

[0133] (Fourth embodiment)

[0134] use Figure 5 The fourth embodiment is described below. In the first embodiment, as the second phosphor layer formed on the phosphor wheel 2, the second phosphor layer 35 mixed with the second phosphor is formed on the first phosphor layer 34, but in the fourth embodiment, the second phosphor layer 35 is formed under the first phosphor layer 34, which is different. Figure 5 1 is a diagram for explaining a fluorescent wheel 62 according to a fourth embodiment. Figure 5 (A) is a top view of the fluorescent wheel 52, Figure 5 (B) is a cross-sectional view along line BB.

[0135] In the first embodiment, after the first phosphor layer 34 is formed on the supporting substrate 10, the second phosphor layer 35 is formed by coating. In the fourth embodiment, the second phosphor layer 35 is first formed on the supporting substrate 10. The second phosphor layer 35 is coated using a dispenser not shown in the figure so as to have the same position and size as in the first embodiment. Next, the second phosphor layer 35 is partially covered on the peripheral area 10b of the supporting substrate 10 to form the first phosphor layer 34 in a circular shape. For example, a screen plate having a printing portion in a circular shape is used, and coating is performed using a known screen printing technique for printing. In screen printing, since printing is performed while scraping the material of the first phosphor layer with a scraper, Figure 5 As shown in the cross-sectional view (B), the thickness of the first phosphor layer 34 in the area where the second phosphor layer 35 is located, i.e., the second segment area 22, can be formed to be thinner than the thickness of the first phosphor layer 34 in the area where the second phosphor layer 35 is not formed, i.e., the first segment area 21.

[0136] In the fourth embodiment, the first phosphor layer 34 is always formed at the boundary between the segments. Since the first phosphor layer 34 is formed in a continuous annular shape, it is possible to prevent a gap from being generated at the boundary between the first segment area 21 and the second segment area 22 due to thermal expansion and contraction.

[0137] In this embodiment, a diffusion layer containing no phosphor may be used instead of the second phosphor layer as in the second embodiment, or a reflective coating may be provided on the entire surface of the support substrate 10 as in the third embodiment.

[0138] (Fifth embodiment)

[0139] use Figure 6 A fifth embodiment will be described. Figure 6 : is a top view of the fluorescent wheel 63 of the fifth embodiment. In the first embodiment, the first segment area 21 and the second segment area 22 are alternately arranged in a plurality of places in the circumferential direction. In the fifth embodiment, the difference is that the second segment area 22 is an area of ​​about 1 / 4 of the circumference, and the other 3 / 4 of the circumference is the first segment area 21. The second segment area of ​​this embodiment is also the same as the first embodiment, and is a structure in which the first fluorescent layer 34 as the lower layer on the supporting substrate 10 side and the second fluorescent layer 35 as the upper layer are stacked. The other structures are the same as those of the first embodiment described above.

[0140] (Sixth embodiment)

[0141] use Figure 7 A sixth embodiment will be described. Figure 7 1 is a top view of the fluorescent wheel 64 of the sixth embodiment. In the fifth embodiment, two segment regions are provided, namely the first segment region 21 and the second segment region 22, but the present embodiment differs in that a third segment region 23 is also provided. The other operations are the same as those of the fifth embodiment.

[0142] Specifically, the fluorescent wheel 64 further includes a third segment region 23 provided in the circumferential direction around the rotation axis Ax. The third segment region 23 is formed by applying a third fluorescent layer 37 on the first fluorescent layer 34, similarly to the second fluorescent layer 35 of the second segment region 22, and the third fluorescent layer 37 includes a fluorescent body that emits fluorescent light of a spectrum different from that of the first fluorescent body and the second fluorescent body.

[0143] (Seventh Implementation Method)

[0144] use Figure 8 A seventh embodiment will be described. Figure 81 is a top view of the fluorescent wheel 65 of the seventh embodiment. In the first embodiment, the first segment area 21 and the second segment area 22 are alternately provided at a plurality of locations in the circumferential direction. In the seventh embodiment, the structure is to have the first segment area provided with the first fluorescent layer 34 and the second segment area having a laminated structure in which the lower layer is the first fluorescent layer 34 and the upper layer is the second fluorescent layer 35 in sequence along the radial direction.

[0145] The first phosphor layer 34 is a ring-shaped layer of uniform thickness as in the first embodiment. Its radial width is larger than the spot diameter of the irradiated area of ​​the incident light L1. The second phosphor layer 35 is formed on the first phosphor layer 34 at a position between the outer periphery and the inner periphery of the first phosphor layer 34. The second phosphor layer 35 is provided at a position corresponding to the irradiated area 40 irradiated by the incident light L1 incident on the incident surface 2 when the fluorescent wheel rotates, and its radial width is the same as the spot diameter. In addition, in this specification, "same" includes not only completely identical situations, but also includes situations that are 10% larger or 10% smaller than the spot diameter.

[0146] In the fifth to seventh embodiments, the first phosphor layer 34 is always formed at the boundary between the segments. Since the first phosphor layer 34 is formed in a continuous annular shape, it is possible to prevent a gap from being generated at the boundary between the first segment area 21 and the second segment area 22 due to thermal expansion and contraction.

[0147] (Ninth Implementation Method)

[0148] use Fig. 9 and Fig.10 A ninth embodiment will be described. Fig. 9 It is a diagram for explaining a projection device 50 according to a ninth embodiment. Fig.10 It is a decomposition representation Fig. 9 In the first embodiment, as a fluorescent wheel, a first fluorescent layer 34 in a ring shape is formed on a disc-shaped supporting substrate 10, but in this embodiment, a fluorescent wheel 55 with a double structure is adopted, which is composed of a supporting substrate 54 having a cutout portion 53 (corresponding to the "opening portion" in the claims) provided on a part of the outer circumference of the disc shape, and a diffusion plate 52 provided on the opposite side of the incident surface of the supporting substrate 54, that is, on the side of the motor 4.

[0149] The diffuser plate 52 is formed of a transmissive material such as glass, ceramic, or resin, and at least the area corresponding to the cutout portion 53 is formed as a diffusion area. The outer diameter of the diffuser plate 52 is substantially the same as the outer diameter of the support substrate 54, and a hole is provided in the center portion for the rotating portion 4a of the motor 4 to be engaged. The diffusion area may be an area where light is diffused by roughening the surface to form concave and convex portions, or an area where a material containing a diffusing material is used in a transmissive material. The diffuser plate 52 may also be a diffuser plate formed of a metal substrate and having a transmissive and diffusive glass or the like embedded in at least the portion corresponding to the diffusion area. The diffuser plate 52 is disposed between the support substrate 54 and the lower support plate 14.

[0150] The support substrate 54 is formed of a metal material similarly to the first embodiment, and has a shaft mounting hole formed in the center. Fig. 9 As shown, a cutout portion 53 is formed in a part of the outer periphery. The cutout portion 53 is formed at the position of the irradiation area 40 irradiated by the incident light L1 when rotating around the rotation axis Ax. In addition, the support substrate 52 and the diffuser plate 52 are concentrically integrated. The support substrate 54 is arranged between the diffuser plate 52 and the upper receiving plate 13.

[0151] A fluorescent material layer is formed on the incident surface side in the outer peripheral region of the portion of the support substrate 54 where the cutout portion 53 is not provided. Fig. 9 In the example of , the first phosphor layer 56 is formed in a C-ring shape and is formed at all positions of the irradiation area 40 irradiated by the incident light L1 when rotating around the rotation axis Ax. However, the first phosphor layer 56 is not provided in the area serving as the cutout portion 53 in the circumference passing through the irradiation area 40. In addition, the second phosphor layer 57 is formed on a portion of the surface of the first phosphor layer 56 formed in a C-ring shape. The second phosphor layer 57 is formed by coating the second phosphor layer 57 on the first phosphor layer 56 only in a portion of the circumference passing through the irradiation area 40, as in the fifth embodiment.

[0152] Thus, when the double-structured fluorescent wheel 55 is rotated around the rotation axis Ax, three segmented areas 58 are formed, namely, an area where the diffuser 52 is exposed, an area where the first fluorescent layer 56 is exposed on the surface, and an area where the second fluorescent layer 57 is exposed on the surface.

[0153] The first segment region 58a is a region where the first phosphor layer 56 is exposed on the surface. Fig.10 In the example, the second segment region 58b corresponds to two regions between the cutout portion 53 and the second phosphor layer 57. The second segment region 58b is a region where the second phosphor layer 57 is formed on the first phosphor layer 56. Fig.10The third segment area 58c corresponds to the area sandwiched between the two first segment areas 58a. The third segment area 58c is an area corresponding to the cutout portion 53 and is an area exposed on the incident surface of the diffuser 52. The first segment area 58a and the second segment area 58b reflect the incident light L1, and the third segment area 58c transmits the incident light L1.

[0154] exist Fig.10 In the projection device 50, the light source 3 also used in the first embodiment is used as the light source device 66. In the light source device 66, a part of the incident light L1 irradiating the fluorescent wheel 55 becomes the reflected light L2, and a part becomes the transmitted light L3. The reflected light L2 includes the fluorescence emitted from the first fluorescent layer 56 and the fluorescence emitted from the second fluorescent layer 57. The transmitted light L3 includes the light component emitted from the semiconductor light source 3. When a blue laser is used as the semiconductor light source 3, and when the first fluorescent layer 56 and the second fluorescent layer 57 include fluorescent materials that are excited by the blue laser and emit red components and green components, the reflected light L2 includes the red component (R) and the green component (G), and the transmitted light L3 includes the blue component (B). The transmitted light L3 is diffused when passing through the diffuser 52, and is reflected by the reflector M5 after being condensed by the condenser lens not shown. The light reflected by the reflector M5 is emitted toward the projection optical unit 6 after being reflected by the reflectors M2 and MB. The reflected light L2 reflected by the fluorescent wheel 55 is condensed by a condenser lens (not shown) and then reflected by the reflectors M3 and M4. Each component is reflected by the reflectors MG and MR and then emitted to the projection optical unit 6. The reflector M3 is a dichroic mirror that reflects the light LG in the green region but transmits the light in the red region.

[0155] In the case of the ninth embodiment, the first phosphor layer 56 is always formed at the boundary between the first segment area 58a and the second segment area 58b. Since the first phosphor layer 56 is formed as a continuous body without interruption at the boundary, it is possible to prevent a gap from being generated at the boundary between the first segment area 58a and the second segment area 58b due to thermal expansion and contraction. In addition, the first phosphor layer 56 of the first segment area 58a is also formed on the end surface on the cutout portion 53 side, which is the boundary with the cutout portion 53. Therefore, it is possible to prevent a gap from being generated at the boundary between the first segment area 58a and the third segment area 58c.

[0156] (Variation Example)

[0157] In the above-mentioned embodiment, other optical elements may be added between the light source device 1 and the projection lens of the projection optical system 6. For example, lenses, reflectors, prisms, filters, etc. may be mentioned.

[0158] Although an example using an MD element is shown as the light spatial modulator included in the projection optical system 6, the present invention is not limited to this, and for example, a transmissive monochrome liquid crystal panel may be used.

[0159] The embodiments of the present invention and their variations have been described above, but the above embodiments and variations are only illustrative in all aspects. The present invention is not to be interpreted restrictively by the description of the above embodiments. The present invention can be added, omitted, replaced and other changes in structure in various other forms without departing from its purpose.

[0160]

Industrial Applicability

[0161] The present invention can be applied to a projection device such as a projector that projects images, videos, etc. It can be applied to a light source device of a projection device that uses a fluorescent wheel.

Claims

1. A light source device, characterized in that: The light source device comprises: a semiconductor light source; and a fluorescent wheel having an incident surface for incident light emitted from the semiconductor light source, The fluorescent wheel comprises a supporting substrate and a plurality of segment forming layers, wherein the supporting substrate is rotatable around a rotation axis and has a plurality of segment regions arranged on its incident surface side, and the plurality of segment forming layers correspond to the plurality of segment regions arranged on the incident surface side of the supporting substrate. The support substrate is formed of a metal material and has a reflective flat surface extending in a circumferential direction with respect to the rotation axis on the incident surface side. In the plurality of segment regions, a first segment region consisting of only a first phosphor layer and a second segment region having a second phosphor layer stacked on the first phosphor layer alternately exist in a circumferential direction centered on the rotation axis, the plurality of segment forming layers include a first segment forming layer provided in the first segment region and a second segment forming layer provided in the second segment region, and the first segment forming layer and the second segment forming layer are continuously formed without a gap, In the first segment region, the first segment forming layer is formed on the flat surface, and the first segment forming layer is a first phosphor layer formed by dispersing a first phosphor in a resin binder, wherein the first phosphor uses the emitted light from the semiconductor light source as excitation light and emits light with a wavelength different from the excitation light. In the second segment region, the second segment forming layer is formed on the flat surface, the second segment forming layer having a lower layer on the support substrate side and an upper layer stacked on the lower layer, The first phosphor layer extends to become the lower layer, The upper layer is a second phosphor layer formed by dispersing a second phosphor in a resin binder, wherein the second phosphor uses the emitted light from the semiconductor light source as excitation light and emits light having a wavelength different from the excitation light and the emitted light from the first phosphor, The second phosphor is excited by the light in the yellow region emitted from the first phosphor to emit light, and the second phosphor is a phosphor having a higher light emission quantum yield when using the light in the yellow region emitted from the first phosphor as the excitation light than when using the light emitted from the semiconductor light source as the excitation light. The width of an irradiated region on the incident surface of the fluorescent wheel irradiated by the emitted light from the semiconductor light source is smaller than the width of the flat surface and the width of the first fluorescent layer in a radial direction centered on the rotation axis.

2. The light source device according to claim 1, characterized in that: The second segment regions are formed in a radial shape with the rotation axis as the center, and are arranged at equal intervals in a circumferential direction with the rotation axis as the center.

3. The light source device according to claim 1 or 2, characterized in that: The support substrate is a light-reflective substrate including an aluminum substrate and a laminated film, wherein the laminated film includes a silicon oxide layer, a silver layer, and a titanium oxide layer in order from the aluminum substrate side on a surface on the incident surface side.

4. The light source device according to claim 1 or 2, characterized in that: The fluorescent wheel has an opening formed on the support substrate in a circumferential direction around the rotation axis. A transmissive diffusion material is provided on the fluorescent wheel at a position where the emitted light from the semiconductor light source passes through the opening.

5. A projection device, comprising: The light source device according to any one of claims 1 to 4; A color component separation unit, into which light emitted from the light source device is incident, and the color component separation unit separates the light into three primary colors of R, G, and B; a projection optical system for performing projection using the light from the color component separation section; a light source device control unit that controls the light source device; and The projection device control unit controls the projection optical system to generate a predetermined projection image using the light from the color component separation unit.

Images