Light source device and projector

Abstract

Provided are a light source device and a projector that can improve the light utilization efficiency of fluorescence. The light source device includes a substrate having a support surface; a first light source disposed on the support surface side of the substrate and emitting first light of a first wavelength band; a first optical member having a first optical layer that opposes the support surface and reflects the first light emitted from the first light source; a first wavelength conversion layer having a light incident surface on which the first light emitted from the first light source is incident, converting the first light into second light of a second wavelength band different from the first wavelength band, and emitting the second light from the light incident surface; a light emission portion formed at least by the substrate and the first optical member and emitting light; and a second optical member having a second optical layer that reflects the first light and transmits the second light, and disposed on the light emission portion. The first optical layer is inclined with respect to the light incident surface and reflects the second light. The first wavelength conversion layer is disposed on one of a surface of the first optical layer on the substrate side and the support surface of the substrate. The light emission portion emits the second light.

Description

Technical Field

[0001] This invention relates to light source devices and projectors. Background Technology

[0002] Previously, light source devices have been proposed that use fluorescence emitted from a phosphor when excitation light emitted from a light source is irradiated by the phosphor to generate illumination light. For example, Patent Document 1 disclosed a light source device using a reflective phosphor wheel that emits fluorescence from the surface of the incident excitation light.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-013764

[0004] However, in the aforementioned light source device, the extraction efficiency of the fluorescence emitted by the phosphor is insufficient, so the fluorescence cannot be used efficiently as illumination light, resulting in a problem of reduced light utilization efficiency of the fluorescence. Summary of the Invention

[0005] To address the aforementioned issues, the light source device of the present invention comprises: a substrate having a support surface; a first light source disposed on the support surface side of the substrate, emitting first light of a first wavelength band; a first optical component having a first optical layer facing the support surface and reflecting the first light emitted from the first light source; and a first wavelength conversion layer having a light incident surface for the first light emitted from the first light source to be incident upon, converting the first light into second light of a second wavelength band different from the first wavelength band, thereby converting the first light into second light of a second wavelength band different from the first wavelength band. The second light is emitted from the light incident surface; a light emitting portion, which emits light, is formed at least by the substrate and the first optical component; and a second optical component, which has a second optical layer that reflects the first light and transmits the second light, the second optical component being disposed in the light emitting portion, the first optical layer being inclined relative to the light incident surface and reflecting the second light, the first wavelength conversion layer being disposed on one of the substrate-side surface of the first optical layer and the support surface of the substrate, and the light emitting portion emitting the second light.

[0006] The projector of the present invention comprises: a light source device of the present invention; a light modulation device that modulates light from the light source device according to image information; and a projection optical device that projects light modulated by the light modulation device. Attached Figure Description

[0007] Figure 1 This is a diagram showing the schematic structure of the projector according to the first embodiment.

[0008] Figure 2 This is a schematic structural diagram of the first lighting device.

[0009] Figure 3It is a three-dimensional diagram showing the main structural parts of the light source device.

[0010] Figure 4 This is the front view of the light source device.

[0011] Figure 5 This is a cross-sectional view of the light source device.

[0012] Figure 6 This is a diagram showing the structure of the light source device according to the second embodiment.

[0013] Figure 7 This is a diagram showing the structure of the light source device according to the third embodiment.

[0014] Figure 8 This is a diagram showing the structure of the light source device in the fourth embodiment.

[0015] Figure 9 This is a diagram showing the structure of the light source device in the first modified example.

[0016] Figure 10 This is a diagram showing the structure of the light source device in the second variation.

[0017] Label Explanation

[0018] 1: Projector; 4B, 4G, 4R: Light modulation device; 6: Projection optical device; 25, 125, 225, 325, 325A, 325B: Light source device; 51: First phosphor layer (first wavelength conversion layer); 51A: First part; 51B: Second part; 250: Light source (first light source); 250a: Light-emitting element; 250b: Substrate; 250c: Reflective layer; 250A: First light source; 250B: Second light source; 251: Phosphor layer (first wavelength conversion layer); 251K: Notch; 252: Substrate; 254: First optical component; 255: 3rd optical component; 256: 4th optical component; 257: 2nd optical component; 258, 1258: 2nd phosphor layer (2nd wavelength conversion layer); 259: Transmitting component; 260: Light emitting part; 261: Recess; 2521: Support surface; 2511: Surface (light incident surface); 2542: 1st optical layer; 2552: 4th optical layer; 2562: 5th optical layer; 2572: 2nd optical layer; 2592: 3rd optical layer; EL: Excitation light (1st light); GL, YL, YL1: Fluorescence (2nd light); RL: Fluorescence (3rd light). Detailed Implementation

[0019] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0020] Furthermore, in the accompanying drawings used in the following description, the features are sometimes enlarged for ease of understanding, and the size ratios of the constituent elements are not necessarily the same as in reality.

[0021] (First Embodiment)

[0022] An example of the projector in this embodiment will be described.

[0023] Figure 1 This is a diagram showing the schematic structure of the projector according to this embodiment.

[0024] like Figure 1 As shown, the projector 1 of this embodiment is a projection-type image display device that displays color images on a screen SCR. The projector 1 includes a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a synthesis optical system 5, a projection optical device 6, a first illumination device 20, and a second illumination device 21.

[0025] The color separation optical system 3 separates the yellow illumination light WL from the first illumination device 20 into red light LR and green light LG. The color separation optical system 3 includes a dichroic mirror 7, a first reflecting mirror 8a, and a second reflecting mirror 8b.

[0026] Dichroic mirror 7 separates the illumination light WL into red light LR and green light LG. Dichroic mirror 7 allows red light LR in the illumination light WL to pass through and reflects green light LG. Second reflector 8b reflects green light LG toward light modulation device 4B. First reflector 8a is disposed in the optical path of red light LR and reflects the red light LR that has passed through dichroic mirror 7 toward light modulation device 4R.

[0027] On the other hand, the blue light LB from the second lighting device 21 is reflected by the reflector 9 toward the light modulation device 4B.

[0028] Here, the structure of the second lighting device 21 will be described.

[0029] The second lighting device 21 includes a light source 81, a condenser lens 82, a diffuser plate 83, a rod lens 84, and a relay lens 85. The light source 81 is composed of at least one semiconductor laser, emitting blue light LB composed of laser light. In addition, the light source 81 is not limited to a semiconductor laser, but may also be an LED that emits blue light.

[0030] The focusing lens 82 is a convex lens that directs the blue light LB onto the diffuser plate 83 in a substantially focused manner. The diffuser plate 83 diffuses the blue light LB from the light source 81 with a predetermined diffusion degree, generating blue light LB with a uniform light distribution that is close to the illumination light WL emitted from the first illumination device 20. For example, frosted glass made of optical glass can be used as the diffuser plate 83.

[0031] Blue light LB, diffused by diffuser plate 83, is incident on rod lens 84. Rod lens 84 is a prism-shaped beam extending along the illumination optical axis ax2 of the second illumination device 21, having an incident end face 84a at one end and an exit end face 84b at the other end. Diffuser plate 83 is fixed to the incident end face 84a of rod lens 84 via an optical adhesive (not shown). Preferably, the refractive index of diffuser plate 83 is as similar as possible to the refractive index of rod lens 84.

[0032] Blue light LB propagates within the rod lens 84 via total internal reflection, thus exiting from the exit end face 84b with improved uniformity of illuminance distribution. The blue light LB exiting the rod lens 84 is incident on the relay lens 85. The relay lens 85 directs the blue light LB, now with improved uniformity of illuminance distribution after passing through the rod lens 84, onto the reflecting mirror 9.

[0033] The shape of the exit end face 84b of the rod lens 84 is rectangular, which is approximately similar to the shape of the image forming area of ​​the light modulation device 4B. As a result, the blue light LB emitted from the rod lens 84 is efficiently incident on the image forming area of ​​the light modulation device 4B.

[0034] Optical modulation device 4R modulates the red light LR according to the image information to form an image light corresponding to the red light LR. Optical modulation device 4G modulates the green light LG according to the image information to form an image light corresponding to the green light LG. Optical modulation device 4B modulates the blue light LB according to the image information to form an image light corresponding to the blue light LB.

[0035] The light modulation devices 4R, 4G, and 4B, for example, use transmissive liquid crystal panels. Furthermore, polarizing plates (not shown) are disposed on the incident and emission sides of the liquid crystal panel, creating a structure that allows only linearly polarized light in a specific direction to pass through.

[0036] Field lenses 10R, 10G, and 10B are respectively disposed on the incident side of optical modulation devices 4R, 4G, and 4B. Field lenses 10R, 10G, and 10B parallelize the principal rays of red light LR, green light LG, and blue light LB incident on each optical modulation device 4R, 4G, and 4B.

[0037] The synthesizing optical system 5 synthesizes the image light corresponding to red light LR, green light LG, and blue light LB by incident image light emitted from light modulation devices 4R, 4G, and 4B, and then emits the synthesized image light toward the projection optical device 6. The synthesizing optical system 5 may use a cross-shaped dichroic prism, for example.

[0038] The projection optics 6 consists of multiple lenses. The projection optics 6 magnifies and projects the image light synthesized by the combining optics system 5 onto the SCR screen. Thus, the image is displayed on the SCR screen.

[0039] Figure 2 This is a schematic structural diagram of the first lighting device 20.

[0040] like Figure 2 As shown, the first illumination device 20 includes a light source device 25, a pickup optical system 26, an integrator optical system 35, a polarization conversion element 36, and an overlapping lens 37.

[0041] The light source device 25 emits yellow illumination light WL toward the pickup optical system 26.

[0042] The structure of the light source device 25 will now be described in detail. In the following figures, the various structures of the light source device 25 will be described using the XYZ coordinate system as needed. The X-axis is an axis parallel to the optical axis ax of the light source device 25; the Z-axis is an axis orthogonal to the optical axis ax and parallel to the normal to the substrate 252 constituting the light source device 25; and the Y-axis is an axis orthogonal to both the X-axis and Z-axis. Furthermore, the optical axis ax of the light source device 25 is perpendicular to... Figure 2 The first lighting device 20 shown has the same lighting optical axis ax1.

[0043] Figure 3 This is a perspective view showing the main structural components of the light source device 25. Figure 4 This is a front view of the light source device 25 viewed from the +X side. Figure 5 This is a cross-sectional view of the light source device 25 along the XZ plane.

[0044] like Figures 3 to 5 As shown, the light source device 25 of this embodiment includes a light source (first light source) 250, a phosphor layer (first wavelength conversion layer) 251, a substrate 252, a mirror layer 253, a first optical component 254, a second optical component 257, a third optical component 255, a fourth optical component 256, a light-transmitting component 259, and a light emitting part 260.

[0045] In this embodiment, the light emitting section 260 is an opening formed on the +X side end face of the substrate 252, the first optical component 254, the third optical component 255, and the fourth optical component 256. The light emitting section 260 emits fluorescence generated by the phosphor layer 251.

[0046] The light source 250 includes a light-emitting element 250a, a substrate 250b, and a reflective layer 250c. The light-emitting element 250a is composed of a light-emitting diode (LED) and emits excitation light (first light) EL. The excitation light EL is light with a blue wavelength (first band) of 400nm to 480nm, for example, a beam with a peak wavelength of 455nm. The substrate 250b supports the light-emitting element 250a and also functions as a heat dissipation substrate for heat dissipation from the light-emitting element 250a. The reflective layer 250c is disposed between the substrate 250b and the light-emitting element 250a, specifically on the surface 250b1 of the substrate 250b on the side of the light-emitting element 250a. The reflective layer 250c is, for example, composed of a metal layer and a dielectric layer.

[0047] The substrate 252 has a support surface 2521 for supporting the phosphor layer 251. The substrate 252 is, for example, a metal plate with excellent heat dissipation such as aluminum or copper.

[0048] The support surface 2521 is a surface parallel to the XY plane. A recess 261 is formed on the support surface 2521 of the substrate 252. The light source 250 is disposed on the support surface 2521 side of the substrate 252. In this embodiment, the light source 250 is disposed in the recess 261 formed in the support surface 2521. The substrate 250b of the light source 250 is thermally connected to the surface of the recess 261. Because the light source 250 is thermally connected to the substrate 252, the light-emitting element 250a can be cooled by releasing heat from the light source 250 to the substrate 252.

[0049] The phosphor layer 251 is a plate-shaped phosphor having a surface (light incident surface) 2511, a side surface 2512, and a back surface 2513. Surface 2511 is the surface on which the excitation light EL is incident. Side surface 2512 is the surface that intersects with surface 2511. Side surface 2512 may also be orthogonal to surface 2511. Back surface 2513 is the surface opposite to surface 2511.

[0050] In this embodiment, as described below, the excitation light EL emitted from the first optical component 254 is incident on the surface 2511 of the phosphor layer 251.

[0051] The phosphor layer 251 contains phosphor particles that, when excited by excitation light EL, emit fluorescence (second light) YL, for example, yellow light in the yellow band (second band) with a wavelength of 550 nm to 640 nm. YAG (yttrium aluminum garnet) phosphors can be used as examples of phosphor particles. Furthermore, the phosphor particles can be formed from a single material or from a mixture of particles formed from two or more materials. The phosphor layer 251 can be, for example, a phosphor layer in which phosphor particles are dispersed in an inorganic binder such as alumina, or a phosphor layer formed by sintering phosphor particles without a binder. The phosphor layer 251 contains multiple scatterers. Transmissive particles with pores and refractive indices different from those of the phosphors are used as scatterers. In this embodiment, pores are used as scatterers.

[0052] The substrate 252 is thermally connected to the phosphor layer 251. Since the substrate 252 and the phosphor layer 251 are thermally connected, the phosphor layer 251 is cooled by releasing heat from it.

[0053] In this embodiment, the phosphor layer 251 has a cutout 251K formed by removing a portion of it. The cutout 251K is provided to penetrate the phosphor layer 251, thus exposing a portion of the substrate 252.

[0054] The phosphor layer 251 is supported on the support surface 2521 of the substrate 252 such that the recess 261 faces the cutout portion 251K when viewed from above. As described above, a light source 250 is disposed in the recess 261. Therefore, the light source 250 is disposed in the cutout portion 251K. The shape of the cutout portion 251K when viewed from above is rectangular. The size of the cutout portion 251K is the same as or slightly larger than the outer shape of the light source 250.

[0055] A mirror layer 253 is disposed between the substrate 252 and the phosphor layer 251. The area of ​​the mirror layer 253 is larger than the area of ​​the back surface 2513 of the phosphor layer 251. The mirror layer 253 is disposed at least around the phosphor layer 251 on the support surface 2521 of the substrate 252. The phosphor layer 251 is bonded to the support surface 2521 of the substrate 252 via the mirror layer 253. The mirror layer 253 is, for example, composed of a metal layer or a dielectric layer. Alternatively, the mirror layer 253 may be formed over the entire area of ​​the support surface 2521. Additionally, a portion of the mirror layer 253 may be formed directly on the back surface 2513 of the phosphor layer 251.

[0056] The first optical component 254 is disposed opposite to the support surface 2521 of the substrate 252. That is, the first optical component 254 is disposed opposite to the surface 2511 of the phosphor layer 251. The first optical component 254 is disposed in a manner that does not contact the phosphor layer 251.

[0057] The first optical component 254 is arranged at an angle relative to the surface 2511 of the phosphor layer 251. The angle between the first optical component 254 and the surface 2511 of the phosphor layer 251 is set to an acute angle.

[0058] The first optical component 254 includes a substrate 2541 and a first optical layer 2542. The substrate 2541 can be formed from any of the following materials: alumina, sapphire, glass, or a non-transparent material such as metal. The first optical layer 2542 is, for example, composed of a dielectric multilayer film or a metal film. The first optical component 254 functions as a reflector to reflect incident light. In addition to reflecting the excitation light EL from the light source 250, the first optical layer 2542 also reflects the fluorescence YL (second light), described later.

[0059] In this embodiment, the phosphor layer 251 converts the excitation light EL emitted from the light source 250 and reflected by the first optical layer 2542 of the first optical component 254 into phosphor YL, which is then emitted from the surface 2511.

[0060] like Figure 4 and Figure 5 As shown, the light-transmitting component 259 is disposed in contact with the light-emitting side (+Z side) of the light source 250. In this embodiment, the light-transmitting component 259 is in contact with the light-emitting element 250a of the light source 250. The light-transmitting component 259 has the same size as the cutout 251K formed in the phosphor layer 251 and is embedded in the cutout 251K. The light-transmitting component 259 also functions as a heat dissipation component for the light-emitting element 250a of the light source 250.

[0061] In this embodiment, the surface 259a of the light-transmitting component 259 on the side of the first optical component 254 is coplanar with the surface 2511 of the phosphor layer 251. That is, the surface 259a of the light-transmitting component 259 and the surface 2511 of the phosphor layer 251 are arranged on the same surface in the direction along the normal of the support surface 2521 of the substrate 252.

[0062] The light-transmitting component 259 includes a light-transmitting substrate 2591 and a third optical layer 2592. The light-transmitting substrate 2591 is made of a light-transmitting material such as alumina, sapphire, or glass. The third optical layer 2592 is disposed on the outer surface of the light-transmitting substrate 2591, i.e., on the side opposite to the light source 250. The third optical layer 2592 has the characteristic of transmitting excitation light EL and reflecting fluorescence. Thus, the light-transmitting component 259 allows the excitation light EL emitted from the light source 250 to pass through and reflects the fluorescence YL generated by the phosphor layer 251. Furthermore, an anti-reflective film such as an AR coating is disposed on the inner surface of the light-transmitting substrate 2591, i.e., on the light source 250 side. Therefore, the light-transmitting component 259 efficiently allows the excitation light EL emitted from the light source 250 to enter the interior by suppressing the reflection of the excitation light EL.

[0063] The third optical component 255 includes a substrate 2551 and a fourth optical layer 2552. The substrate 2551 can be formed from any of the following materials: alumina, sapphire, glass, or a non-transparent material such as metal. The fourth optical layer 2552 is formed on the inner surface of the substrate 2551. The fourth optical layer 2552 is, for example, composed of a dielectric multilayer film or a metal film.

[0064] The third optical component 255 is arranged intersecting the support surface 2521 of the substrate 252 and the first optical component 254. The third optical component 255 is also arranged with the fourth optical layer 2552 intersecting the support surface 2521 and the first optical layer 2542. Alternatively, the third optical component 255 may be orthogonal to the support surface 2521 and the first optical component 254 of the substrate 252. The fourth optical layer 2552 may also be orthogonal to the support surface 2521 and the first optical layer 2542. The third optical component 255 is arranged such that its thickness direction is aligned with the Y-axis direction. The third optical component 255 is disposed near the +Y side of the phosphor layer 251. Therefore, a portion of the fluorescence YL emitted from the phosphor layer 251 toward the +Y side is reflected by the fourth optical layer 2552 of the third optical component 255. In addition to the fluorescence YL, the third optical component 255 also reflects the excitation light EL.

[0065] The third optical component 255 is trapezoidal plate-shaped.

[0066] like Figure 3As shown, the third optical component 255 includes: a first end face 55a forming a trapezoidal upper bottom; a second end face 55b forming a trapezoidal lower bottom; a third end face 55c connecting the first end face 55a and the second end face 55b on the +X side; and a fourth end face 55d connecting the first end face 55a and the second end face 55b on the -X side. Furthermore, the first end face 55a, the second end face 55b, the third end face 55c, and the fourth end face 55d are all flat surfaces. The third end face 55c is the surface opposite to the substrate 252. The fourth end face 55d is the surface in the substrate 2551 opposite to the third end face 55c. The first optical component 254 abuts against the fourth end face 55d. The first optical component 254 is mounted on the fourth end face 55d. The first optical layer 2542 abuts against the fourth end face 55d. The substrate 2541 is placed on the fourth end face 55d through the first optical layer 2542.

[0067] Here, when glass is used as the material of the substrate 2551, chamfering is required to prevent defects by removing sharp parts. In this embodiment, by making the third optical component 255 a trapezoidal plate shape, chamfering is not required, thereby improving the machinability of the substrate 2551.

[0068] In this embodiment, a portion of the third optical component 255 is embedded in the substrate 252. Therefore, the third optical component 255 is firmly supported by the substrate 252.

[0069] A portion of the +X side end of the third optical component 255 is embedded into a groove 2524 formed on the support surface 2521 of the substrate 252. Alternatively, adhesive may be used to fill the gap between the third optical component 255 and the groove 2524.

[0070] Specifically, the entirety of the first end face 55a and the third end face 55c of the third optical component 255 and a portion of the second end face 55b are embedded in the groove 2524. The end edge 55d1 of the fourth end face 55d, located on the -X side and along the Z direction, is coplanar with the support surface 2521 of the substrate 252. Thus, the fourth end face 55d is smoothly connected to the support surface 2521 of the substrate 252. In addition, on the +X side, the second end face 55b is coplanar with the end face of the substrate 252.

[0071] The fourth optical component 256 has the same structure as the third optical component 255.

[0072] That is, the fourth optical component 256 includes a substrate 2561 and a fifth optical layer 2562. The fifth optical layer 2562 is formed on the inner surface of the substrate 2561.

[0073] The fourth optical component 256 is arranged such that it intersects the support surface 2521 of the substrate 252 and the first optical component 254, and is opposite to the third optical component 255. The fourth optical component 256 is also arranged such that the fifth optical layer 2562 intersects the support surface 2521 and the first optical layer 2542, and is opposite to the fourth optical layer 2552. The fourth optical component 256 may also be orthogonal to the support surface 2521 and the first optical component 254 of the substrate 252. The fifth optical layer 2562 may also be orthogonal to the support surface 2521 and the first optical layer 2542. The fourth optical component 256 is arranged such that its thickness direction is aligned with the Y-axis direction. The fourth optical component 256 is disposed near the -Y side of the phosphor layer 251. Therefore, the fluorescence YL emitted from the phosphor layer 251 toward the -Y side and incident on the fourth optical component 256 is reflected by the fifth optical layer 2562 of the fourth optical component 256. In addition to reflecting the fluorescence YL, the fourth optical component 256 also reflects the excitation light EL.

[0074] The fourth optical component 256 is the same trapezoidal plate shape as the third optical component 255.

[0075] The fourth optical component 256 includes: a first end face 56a forming a trapezoidal upper bottom; a second end face 56b forming a trapezoidal lower bottom; a third end face 56c connecting the first end face 56a and the second end face 56b on the +X side; and a fourth end face 56d connecting the first end face 56a and the second end face 56b on the -X side. Furthermore, the first end face 56a, the second end face 56b, the third end face 56c, and the fourth end face 56d are all flat surfaces. The third end face 56c is the surface opposite to the substrate 252. The fourth end face 56d is the surface in the substrate 2561 opposite to the third end face 56c. The first optical component 254 abuts against the fourth end face 56d. The first optical component 254 is mounted on the fourth end face 56d. The first optical layer 2542 abuts against the fourth end face 56d. The substrate 2541 is placed on the fourth end face 56d through the first optical layer 2542.

[0076] In this embodiment, the fourth optical component 256 is firmly supported by the substrate 252 by embedding a portion of the fourth optical component 256 into the substrate 252.

[0077] A portion of the +X side end of the fourth optical component 256 is embedded into a groove 2524 formed on the support surface 2521 of the substrate 252. Alternatively, adhesive can be filled into the gap between the fourth optical component 256 and the groove 2524.

[0078] Specifically, the entirety of the first end face 56a and the third end face 56c of the fourth optical component 256, and a portion of the second end face 56b, are embedded in the groove 2524. The end edge 56d1 of the fourth end face 56d, located on the -X side and along the Z direction, is coplanar with the support surface 2521 of the substrate 252. Thus, the fourth end face 56d is smoothly connected to the support surface 2521 of the substrate 252. Furthermore, on the +X side, the second end face 56b is coplanar with the end face of the substrate 252.

[0079] In this embodiment, the first optical component 254 is supported by the third optical component 255 and the fourth optical component 256. The first optical component 254 is bonded and fixed to the third optical component 255 and the fourth optical component 256.

[0080] Specifically, the first optical component 254 is disposed between the fourth end face 55d of the third optical component 255 and the fourth end face 56d of the fourth optical component 256. On the -X side, the inner end edge 54a of the first optical component 254 contacts the support surface 2521 of the substrate 252.

[0081] With this structure, the light source device 25 of this embodiment closes the -X side through the substrate 252, the first optical component 254, the third optical component 255, and the fourth optical component 256, and forms a light emitting section 260 on the +X side. Therefore, the light source device 25 can prevent the leakage of phosphor YL from the side opposite to the light emitting section 260, and can efficiently emit light from the light emitting section 260.

[0082] In the light source device 25 of this embodiment, the second optical component 257 is arranged to cover the light emitting portion 260. The second optical component 257 includes a light-transmitting substrate 2571 and a second optical layer 2572. The light-transmitting substrate 2571 is, for example, made of a thin glass plate. The second optical layer 2572 is, for example, made of a dichroic layer that allows fluorescence (second light) YL having a yellow band (second band) of 550nm to 640nm to pass through and reflects light in the blue band, including the excitation light EL.

[0083] Therefore, the light emitting unit 260 can selectively extract yellow light containing fluorescence YL as illumination light WL through the second optical component 257.

[0084] In the light source device 25 of this embodiment, the phosphor layer 251 is housed in a housing space S surrounded by a substrate 252, a first optical component 254, a second optical component 257, a third optical component 255, and a fourth optical component 256. An air layer AR is provided in the housing space S, for example.

[0085] Light source 250 emits excitation light EL in a Lambertian emission manner. The excitation light EL emitted from light source 250 via Lambertian emission is incident on a first optical component 254 disposed opposite to light source 250 and is reflected by the first optical layer 2542 of the first optical component 254 toward the support surface 2521 of substrate 252. The excitation light EL reflected by the first optical layer 2542 is incident on a phosphor layer 251 disposed on the support surface 2521. The phosphor layer 251 emits fluorescence YL generated by wavelength conversion of the excitation light EL from its surface 2511. At least a portion of the fluorescence YL emitted from the phosphor layer 251 passes through the second optical component 257 covering the light emitting section 260 and is emitted as illumination light WL.

[0086] Additionally, a portion of the excitation light EL reflected by the first optical layer 2542 is directed toward the light emitting section 260 and reflected by the second optical layer 2572 covering the second optical component 257 of the light emitting section 260. The excitation light EL reflected by the second optical layer 2572 eventually enters the phosphor layer 251 and is thus used to excite the phosphor YL.

[0087] Additionally, a portion of the excitation light EL reflected by the first optical layer 2542 is incident on the support surface 2521 of the substrate 252 and reflected by the mirror layer 253 formed on the support surface 2521. At least a portion of the excitation light EL reflected by the mirror layer 253 is reflected by the second optical layer 2572 of the second optical component 257 and finally incident on the phosphor layer 251 for excitation of the phosphor YL.

[0088] Additionally, a portion of the excitation light EL reflected by the first optical layer 2542 is incident on the light-transmitting member 259, passes through the third optical layer 2592 disposed on the outer surface of the light-transmitting member 259, and is incident on the light source 250 side. A portion of the excitation light EL that has passed through the third optical layer 2592 is reflected by the reflective layer 250c of the light source 250, passes through the light-transmitting member 259, and is emitted toward the first optical member 254. Furthermore, it is reused for excitation of the phosphor layer 251 by being reflected by the first optical layer 2542 of the first optical member 254.

[0089] Additionally, a portion of the fluorescent YL emitted from the phosphor layer 251 is reflected by the first optical component 254 and emitted from the light emitting section 260 through the second optical component 257. Furthermore, a portion of the fluorescent YL that is reflected by the first optical component 254 and incident on the phosphor layer 251 is reflected by the mirror layer 253 through the phosphor layer 251 and emitted from the light emitting section 260 through the second optical component 257.

[0090] Additionally, a portion of the fluorescent YL emitted from the phosphor layer 251 is incident on the third optical component 255 or the fourth optical component 256 via the reflector layer 253, or directly incident on the third optical component 255 or the fourth optical component 256. Furthermore, at least a portion of the fluorescent YL reflected by the third optical component 255 or the fourth optical component 256 is emitted from the light emitting section 260 through the second optical component 257.

[0091] In addition, a portion of the excitation light EL reflected by the first optical component 254 propagates in the opposite direction (-Y side) to the light emission part 260, but is eventually incident on the phosphor layer 251 through repeated reflections and is used to excite the phosphor YL.

[0092] In addition, a portion of the fluorescence YL emitted from the phosphor layer 251 propagates in the opposite direction (-Y side) to the light emission section 260, but is eventually emitted from the light emission section 260 through repeated reflections.

[0093] Thus, in the light source device 25 of this embodiment, the excitation light EL emitted from the light source 250 can be efficiently incident on the phosphor layer 251, and the illumination light WL containing the fluorescence YL generated by the phosphor layer 251 can be emitted from the light emission section 260.

[0094] In the light source device 25 of this embodiment, in the phosphor layer 251, the closer to the -X side, which is the opposite side to the light emitting section 260 that emits the phosphor YL, the easier it is for heat to accumulate and the easier it is for the temperature to rise. Conversely, in the light source device 25 of this embodiment, as... Figure 3 and Figure 5 As shown, the substrate 252 supporting the phosphor layer 251 is shaped such that the side opposite to the light emitting portion 260 is longer. Therefore, the light source device 25 according to this embodiment can efficiently cool the side of the phosphor layer 251 opposite to the light emitting portion 260 where heat easily accumulates. Thus, the phosphor layer 251 can be cooled efficiently.

[0095] Illumination light WL emitted from light source device 25 is incident on pickup optical system 26. Pickup optical system 26 is composed, for example, of pickup lenses 26a and 26b. Pickup optical system 26 has the function of picking up illumination light WL emitted from light source device 25 and parallelizing it.

[0096] Illumination light WL is incident on integrator optical system 35. Integrator optical system 35 is, for example, composed of a first lens array 35a and a second lens array 35b.

[0097] The first lens array 35a contains multiple first small lenses 35am, and the second lens array 35b contains multiple second small lenses 35bm.

[0098] The first lens array 35a separates the illumination light WL into multiple smaller beams. The first small lens 35am images each small beam onto its corresponding second small lens 35bm. The integrator optical system 35, in cooperation with the overlapping lens 37 (described later), images the illuminated area... Figure 1 The illumination distribution in the image forming area of ​​the optical modulation devices 4R, 4G, and 4B shown is made uniform.

[0099] The illumination light WL, having passed through the integrator optical system 35, is incident on the polarization conversion element 36. The polarization conversion element 36 is, for example, composed of a polarization separation film and a phase difference plate (1 / 2 wavelength plate). The polarization conversion element 36 converts the polarization direction of the illumination light WL to one polarization component.

[0100] The illumination light WL, passing through the polarization conversion element 36, is incident on the overlapping lens 37. The illumination light WL emitted from the overlapping lens 37 is incident on the color separation optical system 3. The overlapping lens 37 provides uniform illumination by causing the plurality of small beams constituting the illumination light WL to overlap with each other in the illuminated area of ​​the light modulation devices 4R and 4G, i.e., the image forming area.

[0101] The light source device 25 of this embodiment, as described above, has the following effects.

[0102] The light source device 25 of this embodiment includes: a substrate 252 having a support surface 2521; a light source 250 disposed on the support surface 2521 side, emitting excitation light EL; a first optical component 254 having a first optical layer 2542 facing the support surface 2521 and reflecting the excitation light EL emitted from the light source 250; a phosphor layer 251 having a surface 2511 for incident on the excitation light EL emitted from the light source 250, converting the excitation light EL into phosphor YL, and emitting the phosphor YL from the surface 2511; a light emitting portion 260 formed at least by the substrate 252 and the first optical component 254, emitting illumination light WL; and a second optical component 257 disposed on the light emitting portion 260 having a second optical layer 2572 that reflects the excitation light EL and transmits the phosphor YL. The first optical layer 2542 is inclined relative to the surface 2511 and reflects the phosphor YL. The phosphor layer 251 is disposed on the support surface 2521 of the substrate 252.

[0103] According to the light source device 25 of this embodiment, the phosphor YL can be efficiently extracted as illumination light WL by means of the second optical component 257 disposed in the light emitting section 260. In addition, by using the second optical component 257 to re-incidentate the excitation light EL emitted toward the light emitting section 260 into the phosphor layer 251, the conversion efficiency of the phosphor YL can be improved.

[0104] Therefore, according to the light source device 25 of this embodiment, by improving the light utilization efficiency of the fluorescent YL, a bright illumination light WL can be emitted from the light emission section 260.

[0105] The light source device 25 of this embodiment can reduce optical spread by emitting illumination light WL from the light emitting section 260. In the light source device 25 of this embodiment, the optical spread can be reduced without reducing the incident area of ​​the excitation light on the phosphor layer 251, so the optical density of the excitation light EL in the phosphor layer 251 does not increase. As a result, the decrease in fluorescence conversion efficiency caused by the increase in optical density is suppressed, and therefore, a bright fluorescence YL can be extracted as illumination light WL.

[0106] In the light source device 25 of this embodiment, the phosphor layer 251 has a cutout portion 251K formed by removing a portion of it, and the light source 250 is disposed in the cutout portion 251K of the phosphor layer 251.

[0107] According to this structure, the light source 250 can be positioned at a desired location on the support surface 2521 without interfering with the phosphor layer 251. Therefore, the degree of freedom in the layout of the light source 250 on the substrate 252 is increased.

[0108] In the light source device 25 of this embodiment, the light source 250 includes: a light-emitting element 250a that emits excitation light EL; a substrate 250b that supports the light-emitting element 250a; and a reflective layer 250c disposed on the side of the light-emitting element 250a of the substrate 250b.

[0109] According to this structure, the excitation light EL returning to the light source 250 side can be reflected by the reflective layer 250c and returned to the first optical component 254 side. Therefore, the utilization efficiency of the excitation light EL can be improved.

[0110] In the light source device 25 of this embodiment, a light-transmitting member 259 is also provided in contact with the light-emitting side of the light source 250. Furthermore, the light-transmitting member 259 has a third optical layer 2592 provided on the side opposite to the light source 250, which allows the excitation light EL to pass through and reflects the fluorescence YL.

[0111] According to this structure, heat can be released from the light source 250 through the light-transmitting component 259. Thus, the heat of the light source 250 can be dissipated from both the substrate 252 and the light-transmitting component 259, thereby further improving the heat resistance of the light source 250.

[0112] Furthermore, the light-transmitting component 259 can reflect a portion of the fluorescent YL through the third optical layer 2592, causing it to be emitted from the light-emitting section 260. Therefore, the light utilization efficiency of the fluorescent YL can be further improved.

[0113] In the light source device 25 of this embodiment, the light source 250 is disposed in the recess 261 formed on the support surface 2521 of the substrate 252, and the surface 259a of the first optical component 254 side of the light-transmitting component 259 is coplanar with the surface 2511 of the phosphor layer 251.

[0114] According to this structure, by placing the light source 250 in the recess 261, the light source 250 and the first optical component 254 can be arranged at a predetermined distance apart. This allows the excitation light EL emitted from the light source 250 via Lambertian emission to be efficiently incident on the entire area of ​​the first optical component 254.

[0115] Furthermore, no step is generated between the surface 259a of the light-transmitting component 259 and the surface 2511 of the phosphor layer 251, thus making the incident surface of light incident from the first optical component 254 side a plane. As a result, diffuse reflection of light incident from the first optical component 254 side can be suppressed, and the illumination light WL can be efficiently extracted from the light emitting section 260.

[0116] In the light source device 25 of this embodiment, there are also: a third optical component 255 having a fourth optical layer 2552 that reflects excitation light EL and fluorescence YL, the fourth optical layer 2552 being arranged to intersect with the support surface 2521 and the first optical layer 2542; and a fourth optical component 256 having a fifth optical layer 2562 that reflects excitation light EL and fluorescence YL, the fifth optical layer 2562 being arranged to intersect with the support surface 2521 and the first optical layer 2542 and to face the fourth optical layer 2552. The light emitting portion 260 is formed by the substrate 252, the first optical component 254, the third optical component 255, and the fourth optical component 256.

[0117] According to this structure, by suppressing light leakage from outside the light emitting section 260, the illumination light WL can be emitted efficiently from the light emitting section 260.

[0118] The projector 1 of this embodiment, as described above, achieves the following effects.

[0119] The projector 1 of this embodiment includes: a light source device 25; light modulation devices 4B, 4G, and 4R, which modulate blue light LB, green light LG, and red light LR from the light source device 25 according to image information, thereby forming image light; and a projection optical device 6, which projects the image light.

[0120] The projector 1 according to this embodiment is able to form and project a high-brightness image because it has a light source device 25 that generates bright illumination light WL.

[0121] (Second Implementation)

[0122] Next, the structure of the light source device according to the second embodiment of the present invention will be described. Furthermore, in this embodiment, the same reference numerals are used to denote structures or components identical to those in the first embodiment, and detailed descriptions are omitted.

[0123] Figure 6 This is a diagram showing the structure of the light source device in this embodiment.

[0124] like Figure 6 As shown, the light source device 125 of this embodiment includes a light source 250, a phosphor layer 251, a substrate 252, a mirror layer 253, a first optical component 254, a second optical component 257, a third optical component 255, a fourth optical component 256, and a light emitting section 260.

[0125] In this embodiment, the light source 250 is disposed on the support surface 2521 of the substrate 252. That is, no recess is formed on the support surface 2521 of the substrate 252. A reflector layer 253 is formed between the light source 250 and the support surface 2521. The phosphor layer 251 is disposed on the inner surface (the surface on the substrate 252 side) 2542a of the first optical layer 2542. In this embodiment, the phosphor layer 251 is disposed opposite to the light source 250.

[0126] Excitation light EL emitted from light source 250 is incident on phosphor layer 251 disposed opposite to light source 250. Phosphor layer 251 emits fluorescence YL generated by wavelength conversion of excitation light EL. At least a portion of the fluorescence YL emitted from phosphor layer 251 passes through the second optical layer 2572 of the second optical component 257 covering light emitting section 260 and is emitted as illumination light WL.

[0127] Additionally, a portion of the excitation light EL is reflected by the first optical layer 2542 of the first optical component 254 and directed toward the light emitting portion 260, where it is reflected by the second optical layer 2572 of the second optical component 257 covering the light emitting portion 260. The excitation light EL reflected by the second optical layer 2572 is directly incident on the phosphor layer 251 via at least one of the mirror layer 253, the third optical component 255, and the fourth optical component 256, or without both, thereby being reused for the excitation of the phosphor YL.

[0128] Thus, in the light source device 125 of this embodiment, the excitation light EL emitted from the light source 250 can be efficiently incident on the phosphor layer 251, and the fluorescence YL generated by the phosphor layer 251 can be emitted from the light emission section 260 as illumination light WL. Therefore, according to the light source device 125 of this embodiment, bright illumination light WL can be emitted from the light emission section 260.

[0129] In addition, in this embodiment, the light source 250 may also be disposed in the recess 261 formed on the substrate 252.

[0130] (Third Implementation)

[0131] Next, the structure of the light source device according to the third embodiment of the present invention will be described. Furthermore, in this embodiment, the same reference numerals are used to denote structures or components identical to those in the first embodiment, and detailed descriptions are omitted.

[0132] Figure 7 This is a diagram showing the structure of the light source device in this embodiment.

[0133] like Figure 7 As shown, the light source device 225 of this embodiment includes a first light source 250A, a second light source 250B, a phosphor layer 251, a substrate 252, a mirror layer 253, a first optical component 254, a second optical component 257, a third optical component 255, a fourth optical component 256, and a light emitting section 260.

[0134] In this embodiment, the first light source 250A and the second light source 250B each have the same structure as the light source 250 in the first embodiment. That is, the first light source 250A and the second light source 250B emit excitation light EL in the blue band (first band) of 400nm to 480nm.

[0135] The first light source 250A and the second light source 250B are disposed on the support surface 2521 of the substrate 252. Similar to the second embodiment, no recess is formed on the support surface 2521 of the substrate 252. A reflective layer 253 is formed between the first light source 250A and the second light source 250B and the support surface 2521.

[0136] The first light source 250A is disposed on the light emitting portion 260 side (+X side) opposite to the phosphor layer 251, and the second light source 250B is disposed on the opposite side (-X side) of the light emitting portion 260 opposite to the phosphor layer 251. The first light source 250A, the phosphor layer 251, and the second light source 250B are arranged on the support surface 2521 of the substrate 252 in an X-axis direction.

[0137] According to the light source apparatus 225 of this embodiment, the phosphor layer 251 is excited by excitation light EL emitted from the first light source 250A and the second light source 250B, thus enabling efficient excitation of the phosphor layer 251. In this embodiment, since the phosphor layer 251 is disposed between the first light source 250A and the second light source 250B, the excitation light EL emitted from the first light source 250A and the second light source 250B can be incident on the phosphor layer 251 in a good balance, generating bright fluorescence YL.

[0138] Furthermore, in this embodiment, the first light source 250A and the second light source 250B may also be disposed in the recess 261 formed on the support surface 2521 of the substrate 252.

[0139] (Fourth implementation)

[0140] Next, the structure of the light source device according to the fourth embodiment of the present invention will be described. Furthermore, in this embodiment, the same reference numerals are used to denote structures or components identical to those in the first embodiment, and detailed descriptions are omitted.

[0141] Figure 8 This is a diagram showing the structure of the light source device in this embodiment.

[0142] like Figure 8 As shown, the light source device 325 of this embodiment includes a light source 250, a first phosphor layer (first wavelength conversion layer) 51, a second phosphor layer (second wavelength conversion layer) 258, a substrate 252, a mirror layer 253, a first optical component 254, a second optical component 257, a third optical component 255, a fourth optical component 256, and a light emitting section 260.

[0143] The first phosphor layer 51 of this embodiment is composed of a first portion 51A and a second portion 51B disposed separately from each other. The first portion 51A and the second portion 51B are each made of the same phosphor material as the phosphor layer 251 of the first embodiment. A light source 250 is disposed between the first portion 51A and the second portion 51B. The light source 250 is disposed on the support surface 2521 in a state where it is sandwiched between the first portion 51A and the second portion 51B. In this embodiment, no recess is formed on the support surface 2521 of the substrate 252.

[0144] The second phosphor layer 258 is disposed on the inner surface (surface on the substrate 252 side) 2542a of the first optical layer 2542. In this embodiment, the second phosphor layer 258 is made of the same phosphor material as the first phosphor layer 51. The second phosphor layer 258 converts the excitation light EL into yellow light, i.e., fluorescence YL1, which is different from the blue band (first band) and has a yellow band of, for example, 550 nm to 640 nm. That is, the second phosphor layer 258 converts a portion of the excitation light EL emitted from the light source 250 into fluorescence YL1.

[0145] In this embodiment, the yellow band (third band) of the fluorescence YL1 emitted by the second phosphor layer 258 is the same as the yellow band (second band) of the fluorescence YL emitted by the first phosphor layer 51.

[0146] In this embodiment, the scattering degree of light in the second phosphor layer 258 is less than that in the first phosphor layer 51. The scattering degree can be adjusted by the number of scatterers included in the phosphor. Transmissive particles with pores and refractive indices different from those of the phosphor are used as scatterers. In this embodiment, the number of scatterers included in the second phosphor layer 258 is less than the number of scatterers included in the first phosphor layer 51. For example, by using a single-crystal phosphor, a second phosphor layer 258 with fewer scatterers can be achieved.

[0147] Compared to the first phosphor layer 51, the second phosphor layer 258 suppresses backscattering of light, so the excitation light EL incident from the light source 250 can easily travel without being scattered within the phosphor.

[0148] Furthermore, in this embodiment, the thickness of the second phosphor layer 258 is less than the thickness of the first phosphor layer 51. The thickness of the second phosphor layer 258 refers to the dimension in the normal direction of the surface on which the second phosphor layer 258 is disposed (the surface of the first optical layer 2542 of the first optical component 254), and the thickness of the first phosphor layer 51 refers to the dimension in the normal direction of the support surface 2521 on which the first phosphor layer 51 is disposed.

[0149] If the thickness of the phosphor is reduced, the excitation light is more likely to escape from the phosphor before being converted into fluorescence.

[0150] In this embodiment, as described above, the fluorescence conversion efficiency of the second phosphor layer 258 is suppressed by inhibiting backscattering and thickness relative to the first phosphor layer 51. Consequently, most of the excitation light EL emitted from the light source 250 is not converted into fluorescence in the second phosphor layer 258, but instead passes through the second phosphor layer 258 and is incident on the first optical component 254, where it is reflected by the first optical layer 2542. At least a portion of the excitation light EL reflected by the first optical layer 2542 passes through the second phosphor layer 258 and is emitted from the second phosphor layer 258 toward the first phosphor layer 51.

[0151] Alternatively, the fluorescence conversion amount can be controlled by adjusting either the amount of scattering or the thickness of the second phosphor layer 258 relative to the first phosphor layer 51.

[0152] In the second phosphor layer 258, a portion of the fluorescent YL1 is emitted directly from the second phosphor layer 258, while the remaining portion of the fluorescent YL1 is reflected by the first optical component 254 and emitted.

[0153] In addition to emitting fluorescence YL1 obtained by wavelength conversion of excitation light EL, the second phosphor layer 258 also emits most of the excitation light EL that has not undergone wavelength conversion. That is, the second phosphor layer 258 emits light containing both fluorescence YL1 and excitation light EL.

[0154] In this embodiment, the first phosphor layer 51 converts a portion of the excitation light EL emitted from the second phosphor layer 258 into fluorescence YL. That is, the first phosphor layer 51 is excited by a portion of the excitation light EL emitted from the light source 250 and indirectly incident via the second phosphor layer 258.

[0155] In this embodiment, excitation light EL emitted from the light source 250 is incident on the entire area of ​​the second phosphor layer 258. The second phosphor layer 258 suppresses fluorescence conversion efficiency by suppressing backscattering and thickness relative to the first phosphor layer 51; therefore, most of the excitation light EL is not converted to fluorescence but passes through the second phosphor layer 258 and is incident on the first optical layer 2542 of the first optical component 254. The first optical layer 2542 reflects the excitation light EL toward the support surface 2521 of the substrate 252. At least a portion of the excitation light EL reflected by the first optical layer 2542 passes through the second phosphor layer 258 and exits toward the support surface 2521 of the substrate 252. Additionally, a portion of the excitation light EL is backscattered within the second phosphor layer 258 or reflected at its surface and exits toward the support surface 2521 of the substrate 252.

[0156] In this way, the second phosphor layer 258 emits excitation light EL toward the support surface 2521 of the substrate 252.

[0157] Additionally, a portion of the excitation light EL incident on the second phosphor layer 258 is converted into fluorescence YL1. Fluorescence YL1 is emitted from the second phosphor layer 258 via or without the first optical layer 2542. At least a portion of the fluorescence YL1 emitted from the second phosphor layer 258 passes through the second optical component 257 and is emitted from the light emitting section 260 as illumination light WL.

[0158] Alternatively, a portion of the fluorescent YL1 is incident on the support surface 2521 of the substrate 252 and reflected by the reflective mirror layer 253 formed on the support surface 2521. At least a portion of the fluorescent YL1 reflected by the reflective mirror layer 253 passes through the second optical component 257 and is emitted from the light emitting portion 260 as illumination light WL.

[0159] Additionally, a portion of the fluorescent YL1 incident on the first phosphor layer 51 is backscattered or reflected from the surface within the first phosphor layer 51 and passes through the second optical component 257, emitting as illumination light WL from the light emitting section 260. Furthermore, a portion of the fluorescent YL1 incident on the first phosphor layer 51 is reflected by the mirror layer 253 after passing through the first phosphor layer 51, and thus passes through the second optical component 257 and is emitted as illumination light WL from the light emitting section 260.

[0160] Excitation light EL1 emitted from the second phosphor layer 258 is incident on the first phosphor layer 51 at the first portion 51A and the second portion 51B. As described above, the first phosphor layer 51 improves fluorescence conversion efficiency by increasing the degree of light scattering and its thickness relative to the second phosphor layer 258. Therefore, most of the excitation light EL1 emitted from the second phosphor layer 258 is converted into fluorescence YL in the first phosphor layer 51 (first portion 51A and second portion 51B). A portion of the fluorescence YL emitted from the first phosphor layer 51 passes through the second optical component 257 and is emitted from the light emitting section 260 as illumination light WL.

[0161] Additionally, a portion of the fluorescence YL emitted from the first phosphor layer 51 is incident on the second phosphor layer 258, scattered behind the second phosphor layer 258, and emitted as illumination light WL from the light emitting section 260 through the second optical component 257.

[0162] In addition, a portion of the fluorescent YL incident on the second phosphor layer 258 is reflected by the first optical layer 2542 of the first optical component 254 through the second phosphor layer 258, and is emitted from the second phosphor layer 258, and is emitted as illumination light WL from the light emitting part 260 through the second optical component 257.

[0163] Additionally, a portion of the fluorescent YL reflected by the first optical layer 2542 of the first optical component 254 is incident on the support surface 2521 of the substrate 252, reflected by the mirror layer 253 formed on the support surface 2521 and transmitted through the second optical component 257, and emitted from the light emission portion 260 as illumination light WL.

[0164] Additionally, a portion of the excitation light EL and a portion of the fluorescence YL and YL1 are incident on the third optical component 255 or the fourth optical component 256 via the reflector layer 253, or directly onto the third optical component 255 or the fourth optical component 256 without passing through the reflector layer 253. A portion of the excitation light EL and a portion of the fluorescence YL and YL1 are reflected by the third optical component 255 or the fourth optical component 256, and thus pass through the second optical component 257 and are emitted from the light emitting section 260 as illumination light WL.

[0165] In addition, a portion of the excitation light EL and a portion of the fluorescence YL and YL1 propagate in the opposite direction (-X side) to the light emission section 260, but are eventually emitted from the light emission section 260 through repeated reflections.

[0166] Thus, in the light source device 325 of this embodiment, illumination light WL comprising fluorescence YL generated by the first phosphor layer 51 and fluorescence YL1 generated by the second phosphor layer 258 can be emitted from the light emission section 260.

[0167] According to the light source device 325 of this embodiment, the fluorescent YL1 generated by the second phosphor layer 258 and the fluorescent YL generated by the first phosphor layer 51 can be extracted from the light emission section 260 as illumination light WL. Therefore, according to the light source device 325 of this embodiment, bright illumination light WL can be emitted from the light emission section 260.

[0168] Furthermore, in this embodiment, it is not necessary to arrange the light source 250 in the cutout portion 251K as in the first embodiment. It is sufficient to arrange the first portion 51A and the second portion 51B in such a way that the light source 250 is sandwiched. Therefore, the alignment of the first phosphor layer 51 on the support surface 2521 of the substrate 252 with the light source 250 becomes easier.

[0169] Alternatively, in this embodiment, the light source 250 may also be disposed at the cutout formed in the first phosphor layer 51. Furthermore, the light source 250 may also be disposed in the recess 261 formed in the support surface 2521 of the substrate 252.

[0170] (First variation)

[0171] In the fourth embodiment, the second phosphor layer 258 is made of the same fluorescent material as the first phosphor layer 51, but it may also be made of a different phosphor material.

[0172] Figure 9 This is a diagram showing the structure of the light source device in this modified example.

[0173] like Figure 9 As shown, the light source device 325A of this modified example includes a light source 250, a first phosphor layer 51, a second phosphor layer (second wavelength conversion layer) 1258, a substrate 252, a mirror layer 253, a first optical component 254, a second optical component 257, a third optical component 255, a fourth optical component 256, and a light emitting section 260.

[0174] In this modified example, the second phosphor layer 1258 converts the excitation light EL into red light, specifically red light (third light) RL, which has a wavelength of 600 nm to 800 nm, different from the blue band. In this embodiment, the red band (third band) of the fluorescence RL emitted by the second phosphor layer 1258 is larger than the yellow band (second band) of the fluorescence YL emitted by the first phosphor layer 51 and the blue band (first band) of the excitation light EL emitted by the light source 250. The fluorescence RL is transmitted through the second optical component 257.

[0175] As such a red phosphor, for example, using a phosphor containing any one of Pr, Eu, or Cr as an activator, derived from (Y1) -x Gd x )3(Al,Ga)5O 12 The resulting YAG-based phosphors can be any of the following: Pr:YAG, Eu:YAG, or Cr:YAG. Additionally, the activator can be one selected from Pr, Eu, or Cr, or a co-activator containing multiple selected from Pr, Eu, or Cr.

[0176] Alternatively, the first phosphor layer 51 may also be composed of a monomeric phosphor, as in the phosphor layer 251 of the first and second embodiments.

[0177] In this embodiment, the scattering degree of light in the second phosphor layer 1258 is less than that in the phosphor layer 251. In this embodiment, the number of scatterers contained in the second phosphor layer 1258 is less than the number of scatterers contained in the first phosphor layer 51.

[0178] In addition, in this embodiment, by making the thickness of the second phosphor layer 1258 smaller than the thickness of the first phosphor layer 51, the fluorescence conversion efficiency in the second phosphor layer 1258 is suppressed, thereby making the excitation light EL easier to transmit.

[0179] According to the light source device 325A of this modified example, the fluorescence RL generated by the second phosphor layer 1258 and the fluorescence YL generated by the first phosphor layer 51 can be extracted from the light emission section 260 as illumination light WL1.

[0180] Here, for example, when generating white illumination light at 6500K, using only yellow fluorescence would result in insufficient red components. In contrast, in the light source device 325A of this modified example, the red components of the illumination light WL1 can be supplemented using red light, i.e., fluorescence RL, generated by the second phosphor layer 1258. Therefore, according to the light source device 325A of this modified example, yellow illumination light WL1 with high color reproducibility and sufficient red components can be generated.

[0181] Therefore, the projector equipped with the light source device 325A of this embodiment can project images with high brightness and high red reproducibility.

[0182] (Second variation)

[0183] In the first variation, a phosphor that generates yellow fluorescence was used as the first phosphor layer 51, but phosphors that generate fluorescence of different colors may also be used.

[0184] Figure 10 This is a diagram showing the structure of the light source device in this modified example.

[0185] like Figure 10 As shown, the light source device 325B of this modified example includes a light source 250, a first phosphor layer 510, a second phosphor layer 1258, a substrate 252, a mirror layer 253, a first optical component 254, a second optical component 257, a third optical component 255, a fourth optical component 256, and a light emitting section 260.

[0186] The first phosphor layer 510 is composed of a first portion 510A and a second portion 510B arranged separately from each other. In this modified example, the first phosphor layer 510 converts the excitation light EL into green light, i.e., fluorescence (second light) GL, which has a green wavelength range of 500 nm to 570 nm, different from the blue wavelength range. The second phosphor layer 1258 converts the excitation light EL into red light, i.e., fluorescence (third light) RL, which has a red wavelength range of 600 nm to 800 nm, different from the blue wavelength range. In this modified example, the red wavelength range (third wavelength range) of the fluorescence RL emitted by the second phosphor layer 1258 is larger than the green wavelength range (second wavelength range) of the fluorescence GL emitted by the first phosphor layer 510 and the blue wavelength range (first wavelength range) of the excitation light EL emitted by the light source 250. The fluorescence GL is transmitted through the second optical component 257.

[0187] As a green phosphor constituting such a first phosphor layer 510, for example, Lu3Al5O can be used. 12 Ce3+-based phosphors, Y3O4:Eu 2+ System phosphor, (Ba,Sr)2SiO4:Eu 2+ Phosphor, Ba3Si6O 12 N2: Eu 2+ System phosphor, (Si,Al)6(O,N)8:Eu 2+ It is a phosphor. In addition, the first phosphor layer 510 may be composed of two parts as in the first phosphor layer 51 of the fourth embodiment, or it may be composed of a single phosphor as in the phosphor layer 251 of the first and second embodiments.

[0188] In this modified example, the degree of light scattering in the second phosphor layer 1258 is less than the degree of light scattering in the first phosphor layer 510. In this embodiment, the number of scatterers contained in the second phosphor layer 1258 is less than the number of scatterers contained in the first phosphor layer 510.

[0189] In addition, in this embodiment, by making the thickness of the second phosphor layer 1258 smaller than the thickness of the first phosphor layer 510, the fluorescence conversion efficiency in the second phosphor layer 1258 is suppressed, thereby making the excitation light EL easier to transmit.

[0190] According to the light source device 325B of this modified example, the fluorescence RL generated by the second phosphor layer 1258 and the fluorescence GL generated by the first phosphor layer 510 can be extracted from the light emission section 260 as yellow illumination light WL2.

[0191] In the light source device 325B of this modified example, since green light (fluorescence GL) generated by the first phosphor layer 510 and red light (fluorescence RL) generated by the second phosphor layer 1258 are used, yellow illumination light WL2 with high color reproducibility of red and green can be generated.

[0192] Therefore, the projector equipped with the light source device 325B of this modified example can project images with high brightness and high reproducibility of each RG color.

[0193] Furthermore, one embodiment of the present invention has been illustrated, but the present invention is not necessarily limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0194] For example, in the above embodiment, the light emitting portion 260 is formed by the substrate 252, the first optical component 254, the third optical component 255 and the fourth optical component 256, but the light emitting portion may also be formed by at least the substrate 252 and the first optical component 254.

[0195] Furthermore, in the above embodiments, the case in which the first optical component 254, the third optical component 255, and the fourth optical component 256 are each composed of separate components is given as an example. However, the first optical component 254, the third optical component 255, and the fourth optical component 256 may also be integrally formed from a single component.

[0196] Furthermore, in the first embodiment, an example is given where the width of the back surface 2513 of the phosphor layer 251 in the Y direction is narrower than the width of the support surface 2521 located within the storage space S in the Y direction. However, the width of the back surface 2513 of the phosphor layer 251 in the Y direction can also be the same as the width of the support surface 2521 located within the storage space S. In this case, the side surface 2512 of the phosphor layer 251 is in contact with the third optical component 255 and the fourth optical component 256. Therefore, the fluorescence YL emitted from the side surface 2512 is reflected by the third optical component 255 and the fourth optical component 256 and returns to the first phosphor layer 51.

[0197] In addition, in other embodiments and variations, the width of the phosphor layer in the Y direction can also be the same as the width of the support surface 2521 in the Y direction.

[0198] Furthermore, while the above embodiment exemplifies a projector 1 equipped with three light modulation devices 4R, 4G, and 4B, it can also be applied to projectors that display color images using only one light modulation device. Moreover, the light modulation device is not limited to the aforementioned liquid crystal panel; for example, a digital micromirror device can also be used.

[0199] Furthermore, while the above embodiments illustrate the application of the light source device of the present invention to a projector, the invention is not limited thereto. The light source device of the present invention can also be applied to lighting appliances such as automotive headlights.

[0200] The light source device according to the present invention may also have the following structure.

[0201] One aspect of the present invention provides a light source device comprising: a substrate having a support surface; a first light source disposed on the support surface side of the substrate, emitting first light of a first wavelength band; a first optical component having a first optical layer facing the support surface and reflecting the first light emitted from the first light source; and a first wavelength conversion layer having a light incident surface for the first light emitted from the first light source to be incident upon, converting the first light into second light of a second wavelength band different from the first wavelength band, and converting the first light into second light of a second wavelength band different from the first wavelength band. Two light rays are emitted from the light incident surface; a light emitting portion, which emits light, is formed at least by the substrate and the first optical component; and a second optical component, which has a second optical layer that reflects the first light and transmits the second light, the second optical component being disposed in the light emitting portion, the first optical layer being inclined relative to the light incident surface and reflecting the second light, the first wavelength conversion layer being disposed on one of the substrate-side surface of the first optical layer and the support surface of the substrate, and the light emitting portion emitting the second light.

[0202] In one embodiment of the light source device of the present invention, the first wavelength conversion layer may be configured such that a portion of it is cut off and disposed on the support surface of the substrate, and the first light source is disposed on the cut-off portion of the first wavelength conversion layer.

[0203] In one embodiment of the light source device of the present invention, the light source device may also be configured to further include a second light source disposed on the support surface side of the substrate, emitting the first light of the first wavelength band, and the first wavelength conversion layer disposed on the support surface of the substrate.

[0204] In one embodiment of the light source device of the present invention, the first light source may be configured such that the first light source is disposed on the light emitting portion side relative to the first wavelength conversion layer, and the second light source is disposed on the side opposite to the light emitting portion relative to the first wavelength conversion layer.

[0205] In one embodiment of the light source device of the present invention, the first wavelength conversion layer may also be configured such that a first portion and a second portion are disposed on the support surface of the substrate and are disposed separately from each other, and the first light source is disposed between the first portion and the second portion.

[0206] In one embodiment of the light source device of the present invention, the first wavelength conversion layer may also be disposed on the substrate side of the first optical layer.

[0207] In one embodiment of the light source device of the present invention, the light source device may also be configured to further include a second wavelength conversion layer disposed on the other side of the substrate-side surface of the first optical layer and the support surface of the substrate, converting the first light into a third light of a third wavelength band different from the first wavelength band, wherein the first wavelength conversion layer is disposed on the support surface of the substrate and the second wavelength conversion layer is disposed on the substrate-side surface of the first optical layer.

[0208] In one embodiment of the light source device of the present invention, the third band may also be configured as the second band.

[0209] In one embodiment of the light source device of the present invention, the first light may be blue light, the second light and the third light may be yellow light, and the light emitting part may emit the second light and the third light.

[0210] In one embodiment of the light source device of the present invention, the third band may be configured to be larger than the first band and the second band.

[0211] In one embodiment of the light source device of the present invention, the first light may be blue light, the second light is yellow light, the third light is red light, and the light emitting part emits the second light and the third light.

[0212] In one embodiment of the light source device of the present invention, the first light may be blue light, the second light is green light, the third light is red light, and the light emitting part emits the second light and the third light.

[0213] In one embodiment of the light source device of the present invention, the first light source may also be configured to include: a light-emitting element; a substrate supporting the light-emitting element; and a reflective layer disposed between the substrate and the light-emitting element.

[0214] In one embodiment of the light source device of the present invention, it may also be configured to further include a light-transmitting component disposed in contact with the light-emitting side of the first light source.

[0215] In one embodiment of the light source device of the present invention, the light-transmitting component may also be configured such that the third optical layer is disposed on the side opposite to the first light source, so that the first light passes through and reflects the second light.

[0216] In one embodiment of the light source device of the present invention, the substrate may be configured such that the substrate has a recess formed on the support surface, the first light source is disposed in the recess of the substrate, and the surface of the light-transmitting component on the first optical component side is coplanar with the light incident surface of the first wavelength conversion layer.

[0217] In one embodiment of the light source device of the present invention, it may also be configured to further include: a third optical component having a fourth optical layer that reflects the first light and the second light, the fourth optical layer being configured to intersect the support surface and the first optical layer; and a fourth optical component having a fifth optical layer that reflects the first light and the second light, the fifth optical layer being configured to intersect the support surface and the first optical layer and to face the fourth optical layer, wherein the light emitting portion is formed by the substrate, the first optical component, the third optical component and the fourth optical component.

[0218] The projector of one embodiment of the present invention may also have the following structure.

[0219] One aspect of the present invention provides a projector comprising: a light source device according to the above-described embodiment of the present invention; a light modulation device for modulating light from the light source device; and a projection optical device for projecting light modulated by the light modulation device.

Claims

1. A light source device, characterized in that, The light source device includes: A substrate having a support surface; A first light source is disposed on the support surface side of the substrate and emits a first light of a first wavelength. A first optical component has a first optical layer facing the support surface and reflecting the first light emitted from the first light source; The first wavelength conversion layer has a light incident surface for the first light emitted from the first light source to be incident on, converts the first light into a second light of a second wavelength band different from the first wavelength band, and emits the second light from the light incident surface; A light-emitting section that emits light, which is formed at least by the substrate and the first optical component; and A second optical component has a second optical layer that reflects the first light and allows the second light to pass through, and the second optical component is disposed in the light emitting portion. The first optical layer is inclined relative to the supporting surface of the substrate and reflects the second light. The first wavelength conversion layer is disposed on the support surface of the substrate. The light emitting part emits the second light.

2. The light source device according to claim 1, characterized in that, The first wavelength conversion layer has a cut-out portion formed by removing a portion of it. The first light source is disposed at the cutout portion of the first wavelength conversion layer.

3. The light source device according to claim 1, characterized in that, The light source device also has a second light source, which is disposed on the support surface side of the substrate and emits the first light of the first wavelength band.

4. The light source device according to claim 3, characterized in that, The first light source is disposed on the light emitting portion side relative to the first wavelength conversion layer. The second light source is disposed on the side opposite to the light emitting portion relative to the first wavelength conversion layer.

5. The light source device according to claim 1, characterized in that, The first wavelength conversion layer includes a first portion and a second portion that are configured separately from each other. The first light source is positioned between the first part and the second part.

6. The light source device according to any one of claims 1 to 5, characterized in that, The light source device also has a second wavelength conversion layer, which is disposed on the substrate side of the first optical layer to convert the first light into a third light of a third wavelength band different from the first wavelength band.

7. The light source device according to claim 6, characterized in that, The third band is the second band.

8. The light source device according to claim 7, characterized in that, The first light is blue light, and the second and third lights are yellow light. The light emitting section emits the second light and the third light.

9. The light source device according to claim 6, characterized in that, The third band is larger than the first band and the second band.

10. The light source device according to claim 9, characterized in that, The first light is blue light, the second light is yellow light, and the third light is red light. The light emitting section emits the second light and the third light.

11. The light source device according to claim 9, characterized in that, The first light is blue light, the second light is green light, and the third light is red light. The light emitting section emits the second light and the third light.

12. The light source device according to any one of claims 1 to 5, characterized in that, The first light source has: a light-emitting element; a substrate supporting the light-emitting element; and a reflective layer disposed between the substrate and the light-emitting element.

13. The light source device according to any one of claims 1 to 5, characterized in that, The light source device also has a light-transmitting component, which is disposed in contact with the light-emitting side of the first light source.

14. The light source device according to claim 13, characterized in that, The light-transmitting component has a third optical layer disposed on the side opposite to the first light source, which allows the first light to pass through and reflects the second light.

15. The light source device according to claim 13, characterized in that, The substrate has a recess formed on the support surface. The first light source is disposed in the recess of the substrate. The surface of the light-transmitting component on the first optical component side is coplanar with the light incident surface of the first wavelength conversion layer.

16. The light source device according to any one of claims 1 to 5, characterized in that, The light source device also includes: A third optical component has a fourth optical layer that reflects the first light and the second light, the fourth optical layer being configured to intersect the support surface and the first optical layer; as well as A fourth optical component has a fifth optical layer that reflects the first light and the second light, the fifth optical layer being configured to intersect the support surface and the first optical layer and to oppose the fourth optical layer. The light emitting portion is formed by the substrate, the first optical component, the third optical component, and the fourth optical component.

17. A projector, characterized in that, The projector has the following features: The light source device according to any one of claims 1 to 16; An optical modulation device that modulates light from the said light source device; and A projection optical device that projects light modulated by the light modulation device.

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