Light source device and projector

Abstract

This invention provides a light source device and a projector capable of efficiently cooling light-emitting elements. The light source device of this invention comprises: a circuit board having a first surface and a second surface disposed opposite to the first surface, and having a first opening penetrating the first surface and the second surface; a first light-emitting element electrically connected to the circuit board, emitting first light having a first wavelength; and a heat-diffusing element disposed on the second surface of the circuit board, with the first light-emitting element disposed within the heat-diffusing element exposed in the first opening.

Description

Technical Field

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

[0002] The light source device for a projector disclosed in Patent Document 1 below has a base component and a light-emitting element held in the base component, so that the heat generated by the light-emitting element is dissipated to the heat dissipation component through the base component and the heat-receiving plate.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-128465

[0004] However, in the aforementioned light source device, the light-emitting element cannot be adequately cooled, leaving room for improvement in the cooling efficiency of the light-emitting element. Summary of the Invention

[0005] To address the aforementioned issues, according to a first aspect of the present invention, a light source device is provided, comprising: a circuit board having a first surface and a second surface disposed opposite to the first surface, and having a first opening penetrating the first surface and the second surface; a first light-emitting element electrically connected to the circuit board and emitting first light having a first wavelength; and a heat-diffusing element disposed on the second surface of the circuit board, wherein the first light-emitting element is disposed within the heat-diffusing element exposed in the first opening.

[0006] According to a second aspect of the present invention, a projector is provided, the projector comprising: a light source device according to a first aspect; a light modulation device that modulates light from the light source device according to image information to form image light; and a projection optical device that projects the image light. Attached Figure Description

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

[0008] Figure 2 This is a perspective view showing the schematic structure of the light source unit in the first embodiment.

[0009] Figure 3 This is a cross-sectional view showing the schematic structure of the light source device according to the second embodiment.

[0010] Figure 4 This is a cross-sectional view showing the schematic structure of the light source device according to the second embodiment.

[0011] Figure 5 This is a cross-sectional view showing the schematic structure of the light source device according to the third embodiment.

[0012] Figure 6This is a cross-sectional view showing the schematic structure of the light source device according to the fourth embodiment.

[0013] Figure 7 This is a cross-sectional view showing the schematic structure of the light source device according to the fifth embodiment.

[0014] Figure 8 This is a cross-sectional view showing the schematic structure of the light source device according to the sixth embodiment.

[0015] Figure 9 This is a cross-sectional view showing the schematic structure of the light source device according to the seventh embodiment.

[0016] Label Explanation

[0017] 1: Projector; 2, 2A, 2B, 2C, 2D, 2E, 2F: Light source device; 4: Heating plate; 5: Heat sink; 6: Connecting component; 7: Reflective film; 11, 11D, 11E: Circuit board; 12a: First light-emitting element; 12b, 112b: Second light-emitting element; 12c, 112c: Third light-emitting element; 12d: Fourth light-emitting element; 14: Wavelength conversion element; 14a: Back side (first incident surface); 14b: Front side (second incident surface); 15, 115, 215: Vapor chamber (heat diffusion element); 20: Photosynthesis optical system; 24: Third dichroic mirror (optical element); 26: Fourth dichroic mirror Mirror (optical element); 115A, 215A: First extension; 115B, 215B: Second extension; 115C, 215C: Third extension; 12a1, 12b1, 12c1: Light emission surface; 400R, 400G, 400B: Light modulation device; 600: Projection optical device; BL: Blue light (first light); E1: Auxiliary excitation light (third light); H1: First opening; H2: Second opening; H3: Third opening; H4: Fourth opening; RL: Red light (third light); RL1: Red light (fourth light); WL: White light (composite light); YL: Fluorescence (wavelength conversion light). Detailed Implementation

[0018] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0019] It should be noted that in the accompanying drawings used in the following description, for ease of understanding, some parts of the features are sometimes shown in enlarged form, and the size ratios of the constituent elements are not necessarily the same as the actual dimensions.

[0020] (First Embodiment)

[0021] Figure 1 This is a schematic structural diagram of the projector according to this embodiment.

[0022] Figure 1The projector 1 shown in this embodiment includes an illumination device 100, a color separation optical system 200, light modulation devices 400R, 400G, and 400B, a cross-shaped dichroic prism 500, and a projection optical device 600. The illumination device 100 emits white light WL.

[0023] The lighting device 100 includes a light source device 2, a first lens array 70, a second lens array 80, a polarization conversion element 92, and an overlapping lens 94. The light source device 2 emits white light WL toward the first lens array 70.

[0024] The first lens array 70 has a plurality of small lenses 71 for splitting the white light WL from the light source device 2 into multiple partial beams. The plurality of small lenses 71 are arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax of the illumination device 100. The second lens array 80 has a plurality of small lenses 81 corresponding to the plurality of small lenses 71 of the first lens array 70. Together with the overlapping lens 94, the second lens array 80 images the images of each small lens 71 of the first lens array 70 near the respective image forming areas of the light modulation devices 400R, 400G, and 400B. The plurality of small lenses 81 are arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax.

[0025] The polarization conversion element 92 converts the segments of the light beam divided by the first lens array 70 into linearly polarized light. The polarization conversion element 92 has a polarization separation layer, a reflective layer, and a phase retardation plate. The polarization separation layer of the polarization conversion element 92 allows the linearly polarized component of one polarization element of the white light WL emitted from the illumination device 100 to pass through, and reflects the other linearly polarized component in a direction perpendicular to the illumination optical axis 100ax. The reflective layer of the polarization conversion element 92 reflects the other linearly polarized component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax. The phase retardation plate of the polarization conversion element 92 converts the other linearly polarized component reflected by the reflective layer into a linearly polarized component of one polarization element.

[0026] The overlapping lens 94 focuses the light beams from the polarization conversion element 92 onto the image forming areas of each of the optical modulation devices 400R, 400G, and 400B. The first lens array 70, the second lens array 80, and the overlapping lens 94 constitute an integrator optical system that ensures a uniform in-plane light intensity distribution of the white light WL from the illumination device 100 in the image forming area.

[0027] The color separation optical system 200 includes dichroic mirrors 210 and 220, reflectors 230, 240, and 250, and relay lenses 260 and 270. The color separation optical system 200 separates the white light WL emitted from the illumination device 100 into red light R, green light G, and blue light B, and guides the red light R, green light G, and blue light B to their respective light modulation devices 400R, 400G, and 400B. Field lenses 300R, 300G, and 300B are disposed between the color separation optical system 200 and the light modulation devices 400R, 400G, and 400B.

[0028] Dichroic mirror 210 allows red light to pass through while reflecting green and blue light. Dichroic mirror 220 reflects green light while allowing blue light to pass through. Mirror 230 reflects red light. Mirrors 240 and 250 reflect blue light.

[0029] The optical modulation devices 400R, 400G, and 400B are each composed of a liquid crystal panel that modulates incident light of various colors according to image information to form an image. The operating mode of the liquid crystal panel can be any mode among TN mode, VA mode, and lateral electric field mode, and is not limited to a specific mode. The optical modulation devices 400R, 400G, and 400B each have an incident-side polarizer (not shown) disposed on the light incident surface side and an exit-side polarizer (not shown) disposed on the light exiting surface side.

[0030] The dichroic prism 500 combines image light emitted from the various light modulation devices 400R, 400G, and 400B to form a color image. The dichroic prism 500 is constructed by bonding four right-angled prisms together, and appears roughly square when viewed from above. In the dichroic prism 500, a dielectric multilayer film is formed at the roughly X-shaped interface where the right-angled prisms are bonded together.

[0031] The color image emitted from the dichroic prism 500 is magnified and projected by the projection optics 600 to form an image on the SCR screen. The projection optics 600 has multiple projection lenses.

[0032] Next, the structure of the light source device 2 will be described. The light source device 2 includes a light source unit 10 and a light synthesis optical system 20.

[0033] In the following figures, the XYZ coordinate system is sometimes used to illustrate the configuration relationship of the components. In this embodiment, the X-axis direction is the emission direction of the white light WL in the light source device 2, the Y-axis direction is the direction in which the light-emitting elements in the light source section 10 are arranged, and the Z-axis direction is perpendicular to the X-axis and Y-axis and is the emission direction of the light in the light source section 10.

[0034] Figure 2 This is a perspective view showing the general structure of the light source unit 10.

[0035] like Figure 2 As shown, the light source unit 10 of the light source device 2 includes a circuit board 11, a first light-emitting element 12a, a second light-emitting element 12b, a first condenser lens 13a, a second condenser lens 13b, a wavelength conversion element 14, a connector CT, a vapor chamber (heat diffusion element) 15, a heat dissipation component 16, a first lens support component 18a, and a second lens support component 18b.

[0036] The circuit board 11 has a rectangular shape, for example, when viewed from above. As the forming material of the circuit board 11, a material with high heat dissipation, such as a metal material, is used. The circuit board 11 has a front side (first side) 11a and a back side (second side) 11b provided on the opposite side of the front side 11a.

[0037] A connector CT is disposed on the front side 11a of the circuit board 11. The circuit board 11 is electrically connected to an external device via the connector CT and is supplied with power, drive signals, etc. A vapor chamber 15 is disposed on the back side 11b of the circuit board 11. A heat dissipation component 16 is disposed on the side of the vapor chamber 15 opposite to the circuit board 11. The heat dissipation component 16 is a heat sink including multiple heat sinks 16a. Alternatively, the heat dissipation component 16 may be omitted if necessary.

[0038] Figure 3 This is a cross-sectional view showing the general structure of the light source device 2.

[0039] like Figure 3 As shown, the circuit board 11 is composed of a laminate formed by stacking a substrate layer 110, a conductive layer 111, and a protective layer 112. The substrate layer 110 is the layer that mainly constitutes the circuit board 11. The conductive layer 111 is a layer composed of, for example, a copper pattern that includes wiring, electrodes, etc., electrically connected to the first light-emitting element 12a and the second light-emitting element 12b. The protective layer 112 is a layer used to protect the conductive layer 111, and is composed of, for example, a photoresist material.

[0040] The circuit board 11 has a first opening H1 and a second opening H2 that penetrate the front side 11a and the back side 11b. The circuit board 11 exposes a portion of the vapor chamber 15 through the first opening H1 and the second opening H2.

[0041] In this embodiment, the first opening H1 and the second opening H2 are, for example, circular openings when viewed from above. Furthermore, the first opening H1 and the second opening H2 are not limited to a circular shape; they can also be polygonal shapes such as squares or triangles, or they can be slits formed by cutting off a portion of the end of the circuit board 11.

[0042] The first light-emitting element 12a is disposed in the vapor chamber 15 exposed in the first opening H1. The first light-emitting element 12a is disposed in the vapor chamber 15 via a support member (not shown). Furthermore, the terminal portion (not shown) of the first light-emitting element 12a is electrically connected to the conductive layer 111 of the circuit board 11 via a metal wire 17.

[0043] The first light-emitting element 12a is a laser source and has a light-emitting surface 12a1 for emitting laser light. The first light-emitting element 12a emits blue light (first light) BL with a blue wavelength (first band). The blue light BL is light with a wavelength of 400nm to 480nm, for example, with a peak wavelength greater than 455nm.

[0044] The second light-emitting element 12b is disposed in the vapor chamber 15 exposed within the second opening H2. The second light-emitting element 12b is disposed in the vapor chamber 15 via a support member (not shown). Furthermore, the terminal portion (not shown) of the second light-emitting element 12b is electrically connected to the conductive layer 111 of the circuit board 11 via a metal wire 17.

[0045] The second light-emitting element 12b is a laser light source and has a light-emitting surface 12b1 that emits laser light. In this embodiment, the second light-emitting element 12b emits excitation light having a first wavelength band as the second light.

[0046] The vapor chamber 15 is cooled by heat diffusion from the first light-emitting element 12a, which is hot due to the emission of blue light BL as a laser, and the second light-emitting element 12b, which is hot due to the emission of excitation light as a laser.

[0047] The steam chamber 15 includes: a heating plate 4 supporting a first light-emitting element 12a and a second light-emitting element 12b; a heat dissipation plate 5 disposed on the side of the heating plate 4 opposite to the first light-emitting element 12a and the second light-emitting element 12b; and a plurality of connecting parts 6 thermally connecting the heating plate 4 and the heat dissipation plate 5. The plurality of connecting parts 6 are disposed within a storage chamber SP.

[0048] In this embodiment, when viewed from above, a portion of the support surface (heated portion 4a) of the first light-emitting element 12a in the heated plate 4 is provided at a position overlapping with the first light-emitting element 12a. In this embodiment, a portion of the multiple connecting members 6 is provided at a position also overlapping with the second light-emitting element 12b.

[0049] The steam chamber 15 includes: a heating section 4a that receives heat from the first light-emitting element 12a and the second light-emitting element 12b; a heat dissipation section 5a that dissipates heat received by the heating section 4a; and a receiving chamber SP that receives the working fluid L in a sealed state. The heating plate 4 and the heat dissipation plate 5 are partially recessed flat plate components corresponding to the receiving chamber SP.

[0050] The heating section 4a is provided on the surface of the heating plate 4 opposite to the receiving chamber SP. The heating section 4a uses heat from the first light-emitting element 12a to change the working fluid L from liquid to gas. In this embodiment, the first light-emitting element 12a is disposed in the portion of the heating section 4a that is exposed within the first opening H1 of the circuit board 11.

[0051] A heat dissipation section 5a is provided on the surface of the heat dissipation plate 5 on the side opposite to the receiving chamber SP. The heat dissipation section 5a condenses and returns to liquid state by dissipating heat from the gaseous working fluid L flowing in the receiving chamber SP. A heat dissipation component 16 is provided on the outer surface of the heat dissipation plate 5 at the portion corresponding to the heat dissipation section 5a.

[0052] In this embodiment, the vapor chamber 15 has a reflective film 7 provided in at least a portion of the heated portion 4a. Specifically, the reflective film 7 is provided in the portion of the heated portion 4a that is exposed within the first opening H1 and the second opening H2 of the circuit board 11. That is, the reflective film 7 is provided in the region of the heated portion 4a where the first light-emitting element 12a is disposed and the region where the second light-emitting element 12b is disposed. The reflective film 7 is made of a multilayer dielectric film or a metal film with excellent reflectivity, such as Ni or Ag. Alternatively, the reflective film 7 may be disposed between the first light-emitting element 12a and the second light-emitting element 12b and the heated portion 4a.

[0053] The steam chamber 15 has a wick structure K disposed within the receiving chamber SP. The wick structure K is disposed at least on the inner surface of the heating plate 4 and the heat dissipation plate 5. In addition, the wick structure K may also be disposed on the surface of multiple connecting parts 6.

[0054] The core structure K allows the working fluid L, sealed within the depressurized storage chamber SP, to permeate. The core structure K, with its fine mesh, exhibits capillary force. The heated section 4a supplies the working fluid L to the portion of the heated plate 4 that contacts the first light-emitting element 12a via the capillary force of the core structure K.

[0055] In the vapor chamber 15 of this embodiment, the heated section 4a uses heat transferred from the first light-emitting element 12a and the second light-emitting element 12b to evaporate the working fluid L that has seeped into the core structure K. The vaporized working fluid L flows through a flow path formed in the receiving chamber SP and moves towards the heat dissipation section 5a of the heat sink 5. The heat dissipation section 5a efficiently releases the heat of the working fluid L to the outside through the heat sink fins 16a of the heat dissipation component 16.

[0056] The working fluid L, liquefied by condensation in the heat dissipation section 5a, permeates into the core structure K disposed in the receiving chamber SP, and is supplied to the heating section 4a by the capillary force of the core structure K, where it evaporates again. In this way, the vapor chamber 15 cools the first light-emitting element 12a and the second light-emitting element 12b by diffusing heat from the heating section 4a to the heat dissipation section 5a.

[0057] Blue light BL emitted from the first light-emitting element 12a is incident on the first condenser lens 13a. The first condenser lens 13a is a convex lens that picks up the blue light BL and parallelizes it. The first condenser lens 13a is mounted on the circuit board 11 via a first lens support member 18a. The first lens support member 18a is a ring-shaped component that holds the bottom of the first condenser lens 13a. In this embodiment, the first light-emitting element 12a is housed in a space defined by the first condenser lens 13a, the first lens support member 18a, the circuit board 11, and the vapor chamber 15. It should be noted that the housing space of the first light-emitting element 12a can also be sealed by filling it with a light-transmitting resin material.

[0058] In this embodiment, a wavelength conversion element 14 is disposed on the light emitting surface 12b1 of the second light-emitting element 12b. The wavelength conversion element 14 has a reverse side 14a and a front side 14b. The reverse side 14a is in contact with the light emitting surface 12b1 and is the surface on which the excitation light emitted from the light emitting surface 12b1 is incident. The front side 14b is the surface that faces the opposite direction to the reverse side 14a and emits the fluorescence YL described later. In addition, the reverse side 14a of the wavelength conversion element 14 and the light emitting surface 12b1 of the second light-emitting element 12b can be directly bonded or bonded via an optical adhesive.

[0059] Wavelength conversion element 14, for example, is composed of (Y,Gd)3(Al,Ga)5O, which is a YAG-based phosphor. 12 The light source is composed of a phosphor layer of Ce. The wavelength conversion element 14 is excited by excitation light from the second light-emitting element 12b. The wavelength conversion element 14 converts the excitation light into fluorescence (wavelength-converted light) YL with a yellow band (third band) different from the blue band. The fluorescence YL is, for example, light with a wavelength range of 550 nm to 640 nm.

[0060] The wavelength conversion element 14 emits fluorescence YL from its front surface 14b by converting the excitation light. That is, the front surface 14b of the wavelength conversion element 14 functions as the light emitting surface for emitting fluorescence YL.

[0061] The fluorescent YL emitted from the wavelength conversion element 14 is incident on the second condenser lens 13b. The second condenser lens 13b is a convex lens that picks up the fluorescent YL and parallelizes it. The second condenser lens 13b is mounted on the circuit board 11 via the second lens support member 18b. The second lens support member 18b is a ring-shaped component that holds the bottom of the second condenser lens 13b. In this embodiment, the second light-emitting element 12b and the wavelength conversion element 14 are housed in a sealed space defined by the second condenser lens 13b, the second lens support member 18b, the circuit board 11, and the vapor chamber 15. It should be noted that sealing can also be achieved by filling the housing space of the second light-emitting element 12b with a light-transmitting resin material.

[0062] According to this structure, the light source 10 emits light containing blue light BL and fluorescent light YL. The light emitted from the light source 10 is incident on the light-combining optical system 20. The light-combining optical system 20 combines the blue light BL emitted from the first light-emitting element 12a and the fluorescent light YL emitted from the second light-emitting element 12b. The light-combining optical system 20 has a first dichroic mirror 21 and a second dichroic mirror 22. The first dichroic mirror 21 and the second dichroic mirror 22 are arranged along the X-axis direction of the arrangement of the first light-emitting element 12a and the second light-emitting element 12b.

[0063] The second dichroic mirror 22 has the optical characteristic of reflecting light in the yellow band (third band). The second dichroic mirror 22 is positioned opposite the second condenser lens 13b of the light source unit 10. The second dichroic mirror 22 is configured at a 45° angle relative to the optical axis of the fluorescent YL emitted from the second condenser lens 13b. The second dichroic mirror 22 reflects the fluorescent YL towards the side of the first dichroic mirror 21 (+X side).

[0064] The first dichroic mirror 21 has the optical characteristics of reflecting blue wavelength (first band) light and transmitting yellow wavelength (third band) light. The first dichroic mirror 21 is arranged opposite to the first condenser lens 13a of the light source unit 10. The first dichroic mirror 21 is configured at a 45° angle relative to the optical axis of the blue light BL emitted from the first condenser lens 13a. The first dichroic mirror 21 reflects the blue light BL and allows the fluorescence YL from the second dichroic mirror 22 to pass through, thereby emitting white light (composite light) WL obtained by combining the blue light BL and the fluorescence YL towards the +X side.

[0065] As described above, the light source device 2 of this embodiment includes: a circuit board 11 having a first opening H1; a first light-emitting element 12a electrically connected to the circuit board 11, emitting blue light BL; and a vapor chamber 15 disposed on the reverse side 11b of the circuit board 11, with the first light-emitting element 12a disposed in the vapor chamber 15 exposed within the first opening H1. Furthermore, the projector 1 of this embodiment also includes: a second light-emitting element 12b electrically connected to the circuit board 11, emitting excitation light; and a wavelength conversion element 14 disposed on the light-emitting surface 12b1 of the second light-emitting element 12b, with the second light-emitting element 12b disposed in the vapor chamber 15 exposed within the second opening H2.

[0066] According to the light source device 2 of this embodiment, since the first light-emitting element 12a and the second light-emitting element 12b are directly disposed in the vapor chamber 15, the cooling efficiency of the first light-emitting element 12a and the second light-emitting element 12b can be improved. Therefore, by improving the luminous efficiency of the first light-emitting element 12a and the second light-emitting element 12b, a bright white light WL can be generated.

[0067] In the light source device 2 of this embodiment, the steam chamber 15 has a heating plate 4, a heat dissipation plate 5, and a plurality of connecting parts 6.

[0068] According to this structure, heat can be efficiently transferred from the heated portion 4a of the heated plate 4 to the heat dissipation portion 5a of the heat sink 5 via the connecting member 6. As a result, the cooling efficiency of the first light-emitting element 12a and the second light-emitting element 12b can be further improved.

[0069] Furthermore, in the steam chamber 15 of this embodiment, the heating plate 4 and the heat dissipation plate 5 are connected by multiple connecting parts 6, thus improving mechanical strength compared to the case where no connecting parts 6 are provided. Therefore, the light source device 2 of this embodiment, by having a steam chamber 15 with excellent durability, maintains excellent reliability in cooling performance over a long period of time.

[0070] In the light source device 2 of this embodiment, when viewed from above the support surface of the first light-emitting element 12a in the heating plate 4, a portion of a plurality of connecting members 6 are provided at a position overlapping the first light-emitting element 12a.

[0071] Here, the first light-emitting element 12a has a small area and a high heat flux. Therefore, it is possible for the working fluid L to evaporate instantly and dry out directly below the first light-emitting element 12a in the heated part 4a. If this happens, the first light-emitting element 12a cannot be cooled.

[0072] In contrast, in this embodiment, even if a drying phenomenon occurs, the first light-emitting element 12a can be cooled by dissipating heat to the heat sink 5 side via the connecting member 6 located directly below the first light-emitting element 12a.

[0073] In addition, in this embodiment, a portion of the connecting member 6 is disposed at a position overlapping with the second light-emitting element 12b, so the reduction in cooling efficiency caused by the drying phenomenon can also be suppressed in the second light-emitting element 12b.

[0074] The projector 1 of this embodiment includes: a light source device 2; light modulation devices 400R, 400G, and 400B, which modulate the light from the light source device 2 according to image information, thereby forming image light; and a projection optical device 600, which projects the image light.

[0075] The projector 1 according to this embodiment is able to display bright images because it has a light source device 2 that generates bright white light WL by improving the luminous efficiency of the first light-emitting element 12a and the second light-emitting element 12b.

[0076] (Second Implementation)

[0077] Next, the light source device of the second embodiment will be described. This embodiment differs from the first embodiment in that it includes three light-emitting elements. In the following description, the same reference numerals are used to denote structures and components common to the first embodiment, and detailed descriptions are omitted.

[0078] Figure 4 This is a cross-sectional view showing the schematic structure of the light source device 2A according to this embodiment.

[0079] like Figure 4 As shown, the light source device 2A includes a light source unit 10A, a light-combining optical system 20, a reflector 23, and a third dichroic mirror (optical element) 24.

[0080] The light source unit 10A of this embodiment includes a circuit board 11, a first light-emitting element 12a, a second light-emitting element 12b, a third light-emitting element 12c, a first condenser lens 13a, a second condenser lens 13b, a third condenser lens 13c, a wavelength conversion element 14, a vapor chamber 15, a heat dissipation component 16, a first lens support component 18a, a second lens support component 18b, and a third lens support component 18c.

[0081] The circuit board 11 of this embodiment has a first opening H1, a second opening H2, and a third opening H3 penetrating the front side 11a and the back side 11b. The first opening H1, the second opening H2, and the third opening H3 expose a portion of the vapor chamber 15. The third opening H3, like the first opening H1 and the second opening H2, is, for example, a circular opening when viewed from above. In this embodiment, a reflective film 7 is also provided on the heat-receiving portion 4a exposed within the third opening H3 of the circuit board 11. Furthermore, the reflective film 7 can be omitted as needed, or it can be provided in any one or more areas (heat-receiving portions 4a) exposed within the first opening H1, the second opening H2, and the third opening H3.

[0082] The third light-emitting element 12c is disposed in the vapor chamber 15 exposed within the third opening H3. The third light-emitting element 12c is disposed in the vapor chamber 15 via a support member (not shown). Furthermore, the terminal portion (not shown) of the third light-emitting element 12c is electrically connected to the conductive layer 111 of the circuit board 11 via a metal wire 17. In this embodiment, a portion of the plurality of connecting members 6 is disposed at a position that also overlaps with the third light-emitting element 12c.

[0083] The third light-emitting element 12c is a laser source and has a light-emitting surface 12c1 that emits laser light. The third light-emitting element 12c emits an auxiliary excitation light (third light) E1 with a short wavelength (second wavelength) different from the blue band (first band). The auxiliary excitation light E1 is light with a wavelength shorter than the blue band, for example, light with a peak wavelength smaller than 455 nm.

[0084] The auxiliary excitation light E1 emitted from the third light-emitting element 12c is incident on the third condenser lens 13c. The third condenser lens 13c is a convex lens that picks up the auxiliary excitation light E1 and parallelizes it. The third condenser lens 13c is mounted on the circuit board 11 via the third lens support member 18c. The third lens support member 18c is a ring-shaped component that holds the bottom of the third condenser lens 13c. In this embodiment, the third light-emitting element 12c is housed in a space defined by the third condenser lens 13c, the third lens support member 18c, the circuit board 11, and the vapor chamber 15. Alternatively, the space housing the third light-emitting element 12c can be sealed by filling it with a light-transmitting resin material.

[0085] According to this structure, the light source 10A of this embodiment emits blue light BL, fluorescent light YL, and auxiliary excitation light E1. The auxiliary excitation light E1 emitted from the light source 10A is incident on the reflector 23. The reflector 23 is arranged opposite to the third condenser lens 13c of the light source 10. The reflector 23 is arranged at an angle of 45° with respect to the optical axis of the auxiliary excitation light E1 emitted from the third condenser lens 13c. The reflector 23 reflects the auxiliary excitation light E1 in the X-axis direction (+X side).

[0086] The auxiliary excitation light E1, reflected by mirror 23, is incident on the third dichroic mirror 24. The third dichroic mirror 24 has the optical properties of reflecting light in the blue band (band 1) or short band (band 2) and transmitting light in the yellow band (band 3).

[0087] In this embodiment, the third dichroic mirror 24 is disposed between the second dichroic mirror 22 of the light-combining optical system 20 and the second condenser lens 13b of the light source unit 10. Specifically, the third dichroic mirror 24 is disposed opposite to the second condenser lens 13b. The third dichroic mirror 24 is configured at a 45° angle relative to the optical axis of the fluorescence YL emitted from the second condenser lens 13b. The third dichroic mirror 24 reflects the auxiliary excitation light E1 toward the light source unit 10A side (-Z side) and allows the fluorescence YL to pass through toward the second dichroic mirror 22 side (+Z side).

[0088] The auxiliary excitation light E1, reflected by the third dichroic mirror 24, is converged by the second condenser lens 13b and incident on the front surface 14b of the wavelength conversion element 14. The auxiliary excitation light E1 is incident on the front surface (second incident surface) 14b, which is different from the back surface (first incident surface) 14a of the excitation light (second light) E, and is converted into fluorescence (wavelength converted light) YL by the wavelength conversion element 14.

[0089] In this embodiment, the wavelength conversion element 14 receives excitation light from both the reverse side 14a and the front side 14b, thus enabling efficient generation of fluorescence YL.

[0090] Furthermore, in this embodiment, the auxiliary excitation light E1 is a shorter wavelength light than the excitation light having a blue band, thus further improving the fluorescence conversion efficiency in the wavelength conversion element 14. Therefore, the wavelength conversion element 14 of this embodiment can generate bright fluorescence YL.

[0091] In this embodiment, the light source 10A emits light containing blue light BL and fluorescent light YL. The blue light BL emitted from the light source 10A is reflected by the first dichroic mirror 21 of the light-combining optical system 20, and the fluorescent light YL emitted from the light source 10A passes through the third dichroic mirror 24, is reflected by the second dichroic mirror 22, and is combined with the blue light BL in the first dichroic mirror 21, thereby generating white light WL.

[0092] As described above, in the light source device 2A according to this embodiment, since the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are directly disposed in the vapor chamber 15, the cooling efficiency of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c can be improved. Furthermore, in this embodiment, the conversion efficiency of the phosphor YL can be improved by using the auxiliary excitation light E1 emitted from the third light-emitting element 12c.

[0093] Therefore, the light source device 2A according to this embodiment can generate a brighter white light WL.

[0094] (Third Implementation)

[0095] Next, the light source device of the third embodiment will be described. This embodiment differs from the first embodiment in that it includes three light-emitting elements. In the following description, the same reference numerals are used to denote structures and components common to the first embodiment, and detailed descriptions are omitted.

[0096] Figure 5 This is a cross-sectional view showing the schematic structure of the light source device 2B according to this embodiment.

[0097] like Figure 5 As shown, the light source device 2B includes a light source unit 10B, a light-synthesizing optical system 20, and a reflector 25.

[0098] The light source unit 10B of this embodiment includes a circuit board 11, a first light-emitting element 12a, a second light-emitting element 12b, a third light-emitting element 112c, a first condenser lens 13a, a second condenser lens 13b, a third condenser lens 13c, a wavelength conversion element 14, a vapor chamber 15, a heat dissipation component 16, a first lens support component 18a, a second lens support component 18b, and a third lens support component 18c.

[0099] The third light-emitting element 112c of this embodiment emits light of a different wavelength band than the third light-emitting element 12c of the second embodiment. Specifically, the third light-emitting element 112c of this embodiment emits red light (third light) RL with a red band (fourth band) that is different from the blue band (first band) and the short band (second band). The red light RL is, for example, light with a wavelength band of 640 nm to 770 nm.

[0100] In this embodiment, the light source 10B emits blue light BL, fluorescent light YL, and red light RL. The red light RL emitted from the light source 10B is incident on the reflector 25. The reflector 25 is positioned opposite the third condenser lens 13c of the light source 10. The reflector 25 is positioned at a 45° angle relative to the optical axis of the red light RL emitted from the third condenser lens 13c. The reflector 25 reflects the red light RL towards one side (+X side) in the X-axis direction.

[0101] The red light RL, reflected by the mirror 25, is incident on the second dichroic mirror 22. In this embodiment, the second dichroic mirror 22 has the optical property of allowing the red light RL to pass through and reflecting the fluorescent light YL. In this embodiment, the light-combining optical system 20 allows the red light RL and the fluorescent light YL to pass through the second dichroic mirror 22 in the X-axis direction (+X side), and reflects the blue light BL in the X-axis direction (+X side), thereby combining the red light RL, the fluorescent light YL, and the blue light BL to generate white light WL1.

[0102] According to the light source device 2B of this embodiment, since the first light-emitting element 12a, the second light-emitting element 12b and the third light-emitting element 112c are directly disposed in the vapor chamber 15, the cooling efficiency of the first light-emitting element 12a, the second light-emitting element 12b and the third light-emitting element 112c can be improved.

[0103] Furthermore, the light source device 2B of this embodiment generates white light WL1 containing red light RL emitted from the third light-emitting element 112c, thus compensating for the insufficient amount of red component in the white light WL emitted from the light source device 2 of the first embodiment. That is, the light source device 2B of this embodiment can generate white light WL1 with improved red reproducibility.

[0104] Therefore, the light source device 2B of this embodiment generates white light WL1 with high color reproducibility, so a projector using the light source device 2B of this embodiment can display images of higher quality by expanding the color gamut.

[0105] (Fourth implementation)

[0106] Next, the light source device of the fourth embodiment will be described. This embodiment differs from the first embodiment in that it includes four light-emitting elements. In the following description, the same reference numerals are used to denote structures and components common to the first embodiment, and detailed descriptions are omitted.

[0107] Figure 6 This is a cross-sectional view showing the schematic structure of the light source device 2C according to this embodiment.

[0108] like Figure 6 As shown, the light source device 2C includes a light source unit 10C, a light-combining optical system 20, a reflector 23, a third dichroic mirror (optical element) 24, and a reflector 25. That is, the light source device 2C of this embodiment has a structure that combines the structures of the light source device 2A of the second embodiment and the light source device 2B of the third embodiment.

[0109] The light source unit 10C of this embodiment includes a circuit board 11, a first light-emitting element 12a, a second light-emitting element 12b, a third light-emitting element 12c, a fourth light-emitting element 12d, a first condenser lens 13a, a second condenser lens 13b, a third condenser lens 13c, a fourth condenser lens 13d, a wavelength conversion element 14, a vapor chamber 15, a heat dissipation component 16, a first lens support component 18a, a second lens support component 18b, a third lens support component 18c, and a fourth lens support component 18d.

[0110] The circuit board 11 of this embodiment has a first opening H1, a second opening H2, a third opening H3, and a fourth opening H4 penetrating the front side 11a and the back side 11b. The first opening H1, the second opening H2, the third opening H3, and the fourth opening H4 expose a portion of the vapor chamber 15. The fourth opening H4, like the first opening H1, the second opening H2, and the third opening H3, is, for example, a circular opening when viewed from above. In this embodiment, a reflective film 7 is also provided on the heat-receiving portion 4a exposed within the fourth opening H4 of the circuit board 11. Furthermore, the reflective film 7 can be omitted as needed, or it can be provided in any one or more areas (heat-receiving portions 4a) exposed within the first opening H1, the second opening H2, the third opening H3, and the fourth opening H4.

[0111] The fourth light-emitting element 12d is a laser light source and has a light-emitting surface 12d1 that emits laser light. The fourth light-emitting element 12d is disposed on a vapor chamber 15 exposed within the fourth opening H4. The fourth light-emitting element 12d is disposed on the vapor chamber 15 via a support member (not shown). Furthermore, the terminal portion (not shown) of the fourth light-emitting element 12d is electrically connected to the conductive layer 111 of the circuit board 11 via a metal wire 17. In this embodiment, a portion of a plurality of connecting members 6 is disposed at a position that also overlaps with the fourth light-emitting element 12d.

[0112] The fourth light-emitting element 12d emits red light (the fourth light) RL1, which has a red band (the fourth band) that is different from the blue band (the first band) and the short band (the second band).

[0113] In this embodiment, the light source 10C emits blue light BL, fluorescent light YL, auxiliary excitation light E1, and red light RL1. The auxiliary excitation light E1 emitted from the light source 10C is used to generate the fluorescent light YL. The red light RL1 emitted from the light source 10C is reflected by the reflector 25 and incident on the second dichroic mirror 22. In this embodiment, the second dichroic mirror 22 has the optical characteristic of allowing the red light RL1 to pass through and reflecting the fluorescent light YL.

[0114] The light source device 2C of this embodiment generates white light WL2 by synthesizing red light RL1, fluorescent light YL and blue light BL in the photosynthesis optical system 20.

[0115] According to the light source device 2C of this embodiment, since the first light-emitting element 12a, the second light-emitting element 12b, the third light-emitting element 12c, and the fourth light-emitting element 12d are directly disposed in the vapor chamber 15, the cooling efficiency of the first light-emitting element 12a, the second light-emitting element 12b, the third light-emitting element 12c, and the fourth light-emitting element 12d can be improved.

[0116] Furthermore, the light source device 2C of this embodiment can generate white light WL2 with improved red reproducibility by using red light RL1 emitted from the fourth light-emitting element 12d.

[0117] In addition, the light source device 2C of this embodiment can use the auxiliary excitation light E1 emitted from the third light-emitting element 12c to improve the conversion efficiency of the fluorescent YL.

[0118] Therefore, the light source device 2C of this embodiment generates bright white light WL2 with high color reproducibility. Thus, a projector using the light source device 2C of this embodiment can display brighter and higher quality images by expanding the color gamut.

[0119] (Fifth Embodiment)

[0120] Next, the light source device of the fifth embodiment will be described. This embodiment differs from the first embodiment in that it has three light-emitting elements and the shape of the vapor chamber is different. In the following description, the same reference numerals are used to denote structures and components common to the first embodiment, and detailed descriptions are omitted.

[0121] Figure 7 This is a cross-sectional view showing the schematic structure of the light source device 2D according to this embodiment.

[0122] like Figure 7 As shown, the light source device 2D includes a light source unit 10D and a light-combining optical system 20. The light source device 2D of this embodiment is a variant of the light source device 2B of the third embodiment.

[0123] The light source unit 10D in this embodiment includes a circuit board 11D, a first light-emitting element 12a, a second light-emitting element 12b, a third light-emitting element 112c, a first condenser lens 13a, a second condenser lens 13b, a third condenser lens 13c, a wavelength conversion element 14, a vapor chamber 115, a heat dissipation component 16, a first lens support component 18a, a second lens support component 18b, and a third lens support component 18c.

[0124] The vapor chamber 115 of this embodiment has a generally L-shaped cross-sectional shape. Specifically, the vapor chamber 115 has: a first extension 115A that extends along the X-axis direction (first direction) and is provided with a first light-emitting element 12a and a second light-emitting element 112b; and a second extension 115B that extends from one end side (the end on the -X side) of the first extension 115A along the Z-axis direction (second direction) that intersects the X-axis direction and is provided with a third light-emitting element 112c.

[0125] The circuit board 11D of this embodiment includes: a first portion 11D1, which is disposed on a first extension 115A of a vapor chamber 115; and a second portion 11D2, which is disposed on a second extension 115B of a vapor chamber 115. A first opening H1 and a second opening H2 are formed in the first portion 11D1, and a third opening H3 is formed in the second portion 11D2. A first light-emitting element 12a and a second light-emitting element 12b are respectively disposed on the circuit board 11D (first portion 11D1) exposed in the first opening H1 and the second opening H2, and a third light-emitting element 12c is disposed on the circuit board 11D (second portion 11D2) exposed in the third opening H3.

[0126] In this embodiment, the third light-emitting element 112c, the second dichroic mirror 22, and the first dichroic mirror 21 are arranged in the X-axis direction. In this embodiment, the red light RL emitted from the third light-emitting element 112c is combined with the fluorescent light YL in the second dichroic mirror 22 and then incident on the first dichroic mirror 21. The fluorescent light YL and the red light RL are combined with the blue light BL in the first dichroic mirror 21, thereby emitting white light WL1 in the X-axis direction.

[0127] In this embodiment, heat dissipation components 16 are respectively provided in the heat dissipation portions 5a of the first extension 115A and the second extension 115B of the vapor chamber 115.

[0128] According to the light source device 2D of this embodiment, by setting the vapor chamber 115 to an L-shaped cross-section, the size of the light source device 2D in the X-axis direction can be miniaturized even when three light-emitting elements are provided. In addition, compared with the light source device 2B of the third embodiment, the reflector 25 for reflecting red light RL can be omitted, thus reducing the number of parts.

[0129] (Sixth Embodiment)

[0130] Next, the light source device of the sixth embodiment will be described. This embodiment differs from the first embodiment in that it has three light-emitting elements and the shape of the vapor chamber is different. In the following description, the same reference numerals are used to denote structures and components common to the first embodiment, and detailed descriptions are omitted.

[0131] Figure 8 This is a cross-sectional view showing the schematic structure of the light source device 2E according to this embodiment.

[0132] like Figure 8 As shown, the light source device 2E includes a light source unit 10E and a fourth dichroic mirror (optical element) 26. The light source device 2E of this embodiment is a variant of the light source device 2A of the second embodiment.

[0133] The light source unit 10E in this embodiment includes a circuit board 11E, a first light-emitting element 12a, a second light-emitting element 12b, a third light-emitting element 12c, a first condenser lens 13a, a second condenser lens 13b, a third condenser lens 13c, a wavelength conversion element 14, a vapor chamber 215, a heat dissipation component 16, a first lens support component 18a, a second lens support component 18b, and a third lens support component 18c.

[0134] The vapor chamber 215 of this embodiment has a generally U-shaped cross-sectional shape. Specifically, the vapor chamber 215 has: a first extension 215A that extends in the X-axis direction (first direction) and is provided with a first light-emitting element 12a; a second extension 215B that is disposed opposite to the first extension 215A and extends in the X-axis direction, and is provided with a third light-emitting element 12c; and a third extension 215C that is connected to one end side (the end on the -X side) of the first extension 115A and the second extension 215B, and is provided with a second light-emitting element 12b.

[0135] The circuit board 11E of this embodiment includes: a first portion 11E1, which is disposed in a first extension 215A of the vapor chamber 215; a second portion 11E2, which is disposed in a second extension 215B of the vapor chamber 215; and a third portion 11E3, which is disposed in a third extension 215C of the vapor chamber 215.

[0136] A first opening H1 is formed in part 11E1, a third opening H3 is formed in part 21E2, and a second opening H2 is formed in part 31E3.

[0137] The first light-emitting element 12a is disposed on the circuit board 11E (first part 11E1) exposed in the first opening H1, the second light-emitting element 12b is disposed on the circuit board 11E (third part 11E3) exposed in the second opening H2, and the third light-emitting element 12c is disposed on the circuit board 11E (second part 11E2) exposed in the third opening H3.

[0138] In this embodiment, the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c are arranged orthogonally to each other's optical axes, and the fourth dichroic mirror 26 is arranged at an angle of 45° to each of the optical axes of the first light-emitting element 12a, the second light-emitting element 12b, and the third light-emitting element 12c.

[0139] The fourth dichroic mirror 26 has the optical properties of reflecting blue and short-wavelength light while transmitting yellow light. In this embodiment, the fourth dichroic mirror 26 allows the fluorescence YL from the wavelength conversion element 14 to pass through and reflects the blue light BL from the first light-emitting element 12a, thereby emitting white light WL, which is a composite of blue light BL and fluorescence YL, in the X-axis direction. Additionally, the fourth dichroic mirror 26 reflects the auxiliary excitation light E1 emitted from the third light-emitting element 12c, which then enters the wavelength conversion element 14.

[0140] In this embodiment, heat dissipation components 16 are respectively provided in the heat dissipation portions 5a of the first extension 215A, the second extension 215B, and the third extension 215C of the vapor chamber 215.

[0141] According to the light source device 2E of this embodiment, by setting the vapor chamber 215 to a U-shaped cross-sectional shape, the size of the light source device 2E in the X-axis and Z-axis directions can be miniaturized even when three light-emitting elements are provided. In addition, compared with the light source device 2A of the second embodiment, the reflector 23 and the third dichroic mirror 24 used to direct the auxiliary excitation light E1 onto the wavelength conversion element 14 can be omitted, and one dichroic mirror can be omitted, thus significantly reducing the number of components.

[0142] Alternatively, in this embodiment, the positions of the first light-emitting element 12a and the third light-emitting element 12c can be interchanged. In this case, the fourth dichroic mirror 26 can be set to face a direction that is rotated 90 degrees around the Y-axis.

[0143] (Seventh Embodiment)

[0144] Next, the light source device of the seventh embodiment will be described. This embodiment differs from the first embodiment in that it has three light-emitting elements and the shape of the vapor chamber is different. In the following description, the same reference numerals are used to denote structures and components common to the first embodiment, and detailed descriptions are omitted.

[0145] Figure 9 This is a cross-sectional view showing the schematic structure of the light source device 2F in this embodiment.

[0146] like Figure 9 As shown, the light source device 2F includes a light source unit 10F, a light-combining optical system 20, and a third dichroic mirror (optical element) 24. The light source device 2F of this embodiment is a variant of the light source device 2D of the fifth embodiment.

[0147] The light source unit 10F of this embodiment includes a circuit board 11D, a first light-emitting element 12a, a second light-emitting element 12b, a third light-emitting element 12c, a first condenser lens 13a, a second condenser lens 13b, a third condenser lens 13c, a wavelength conversion element 14, a vapor chamber 115, a heat dissipation component 16, a first lens support component 18a, a second lens support component 18b, and a third lens support component 18c.

[0148] In the vapor chamber 115 of this embodiment, the third light-emitting element 12c is disposed in the second extension 115B.

[0149] In the light source device 2E of this embodiment, the third light-emitting element 12c and the third dichroic mirror 24 are arranged in the X-axis direction. Furthermore, the second light-emitting element 12b, the wavelength conversion element 14, the third dichroic mirror 24, and the second dichroic mirror 22 are arranged in the Z-axis direction. Additionally, the first light-emitting element 12a and the first dichroic mirror 21 are arranged in the Z-axis direction.

[0150] According to the light source device 2F of this embodiment, by setting the vapor chamber 115 to an L-shaped cross-sectional shape, the size of the light source device 2F in the X-axis direction can be miniaturized. In addition, compared with the light source device 2A of the second embodiment, the reflector 23 for reflecting the auxiliary excitation light E1 can be omitted, thus reducing the number of components.

[0151] The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and appropriate changes can be made without departing from the spirit of the invention.

[0152] For example, in the above embodiments, a vapor chamber is used as a heat diffusion element, but graphite sheets can also be used as heat diffusion elements.

[0153] In the first embodiment, the case in which the second light-emitting element 12b emits excitation light in the same blue band as the first light-emitting element 12a is given as an example. However, the second light-emitting element 12b may also be structured to emit auxiliary excitation light in a different short band than the first light-emitting element 12a.

[0154] In the second embodiment, the case in which the third light-emitting element 12c emits auxiliary excitation light E1 with a wavelength shorter than the blue band is given as an example. However, it is also possible to emit light with the same blue band as the blue light BL and let it be incident on the wavelength conversion element 14.

[0155] In addition, in the above embodiment, the excitation light incident on the wavelength conversion element 14 can also be light with a wavelength shorter than the blue band.

[0156] Alternatively, in the fourth embodiment, the light emitted from the fourth light-emitting element 12d may be configured to replace the red light RL with light of the same wavelength as the blue light BL and the auxiliary excitation light E1.

[0157] The light source device according to the present invention may also have the following structure.

[0158] One aspect of the present invention provides a light source device comprising: a circuit board having a first surface and a second surface disposed opposite to the first surface, and having a first opening penetrating the first surface and the second surface; a first light-emitting element electrically connected to the circuit board and emitting first light having a first wavelength; and a heat-diffusing element disposed on the second surface of the circuit board, wherein the first light-emitting element is disposed on the heat-diffusing element exposed within the first opening.

[0159] In one embodiment of the light source device of the present invention, it may also be configured to further include: a second light-emitting element electrically connected to a circuit board, emitting second light having a first wavelength band or a second wavelength band different from the first wavelength band; and a wavelength conversion element disposed on the light emitting surface of the second light-emitting element, converting the second light into wavelength-converted light having a third wavelength band different from the first and second wavelength bands, wherein the circuit board further has a second opening penetrating the first and second surfaces, and the second light-emitting element is disposed on a heat diffusion element exposed within the second opening.

[0160] It can also be configured to include a third light-emitting element, which is electrically connected to the circuit board and emits third light having any band among the first band, the second band, or a fourth band different from the first band and the second band. The circuit board also has a third opening that penetrates the first surface and the second surface, and the third light-emitting element is disposed in a heat-diffusing element exposed in the third opening.

[0161] In one embodiment of the light source device of the present invention, it may also be configured to further include an optical element that reflects a third light having a first or second wavelength band emitted from a third light-emitting element to a wavelength conversion element, causing the wavelength-converted light emitted from the wavelength conversion element to pass through. The third light is incident on the wavelength conversion element from a second incident surface of the wavelength conversion element that is different from the first incident surface of the wavelength conversion element on which the second light is incident, and the third light is converted into wavelength-converted light by the wavelength conversion element.

[0162] In one embodiment of the light source device of the present invention, the light source device may also be configured to further include a fourth light-emitting element, which is electrically connected to a circuit board and emits a fourth light having any one of a first band, a second band, and a fourth band. The circuit board further includes a fourth opening penetrating the first surface and the second surface, and the fourth light-emitting element is disposed within a heat diffusion element exposed in the fourth opening.

[0163] In one embodiment of the light source device of the present invention, the first light emitted by the first light-emitting element is light having a first wavelength, the second light emitted by the second light-emitting element is light having a first wavelength, the third light emitted by the third light-emitting element is light having a second wavelength, and the fourth light emitted by the fourth light-emitting element is light having a fourth wavelength.

[0164] In one aspect of the light source device of the present invention, the heat diffusion element may be configured to have multiple regions exposed inside the first opening, the second opening, the third opening, and the fourth opening, and a reflective film may be provided in at least one of the multiple regions.

[0165] In one embodiment of the light source device of the present invention, the light source device may also be configured to further include a light-combining optical system that combines a first light emitted from a first light-emitting element and a wavelength-converted light emitted from a wavelength-converting element. The heat-diffusion element has: a first extension extending along a first direction, on which the first light-emitting element and a second light-emitting element are disposed; and a second extension extending from the first extension along a second direction intersecting the first direction, on which a third light-emitting element is disposed. The light-combining optical system emits the combined light obtained by combining at least the first light and the wavelength-converted light in either the first or the second direction.

[0166] In one embodiment of the light source device of the present invention, the heat diffusion element may also be configured to include: a first extension extending in a first direction, wherein one of a first light-emitting element and a third light-emitting element is disposed; a second extension disposed opposite to the first extension extending in the first direction, wherein the other of the first light-emitting element and the third light-emitting element is disposed; and a third extension connected to the end of the first extension in the first direction and the end of the second extension in the first direction, wherein a second light-emitting element is disposed, wherein the optical element transmits wavelength-converted light and reflects the first light, thereby emitting a composite light combining the first light and the wavelength-converted light in the first direction.

[0167] In one embodiment of the light source device of the present invention, the heat diffusion element may also be configured as a vapor chamber.

[0168] In one embodiment of the light source device of the present invention, the vapor chamber may also be configured to include: a heating plate that supports a first light-emitting element; a heat dissipation plate disposed on the side of the heating plate opposite to the first light-emitting element; and a plurality of connecting members that thermally connect the heating plate and the heat dissipation plate.

[0169] In one embodiment of the light source device of the present invention, it may also be configured such that, when viewed from above, a portion of a plurality of connecting members is disposed at a position overlapping with the first light-emitting element.

[0170] The projector according to the present invention may also have the following structure.

[0171] One aspect of the present invention provides a projector comprising: a light source device as described above; a light modulation device that modulates light from the light source device according to image information, thereby forming image light; and a projection optical device that projects the image light.

Claims

1. A light source apparatus, characterized by comprising: The light source device includes: A circuit board having a first surface and a second surface disposed opposite to the first surface, and having a first opening, a second opening and a third opening penetrating the first surface and the second surface; The first light-emitting element is electrically connected to the circuit board and emits first light with a first wavelength band. The second light-emitting element is electrically connected to the circuit board and emits a second light having the first wavelength band as excitation light; The third light-emitting element is electrically connected to the circuit board and emits a third light with a second wavelength shorter than the first wavelength as an auxiliary excitation light. A wavelength conversion element, disposed on the light emitting surface of the second light-emitting element, converts the excitation light and the auxiliary excitation light into wavelength-converted light having a third wavelength band different from the first and second wavelength bands; An optical element that reflects the auxiliary excitation light emitted from the third light-emitting element so that it is incident on the wavelength conversion element, allowing the wavelength-converted light emitted from the wavelength conversion element to pass through; as well as A heat diffusion element is disposed on the second surface of the circuit board. The first light-emitting element is disposed within the heat-diffusing element exposed in the first opening. The second light-emitting element is disposed within the heat-diffusing element exposed in the second opening. The third light-emitting element is disposed within the heat-diffusing element exposed in the third opening. The wavelength conversion element has: a first incident surface, wherein the excitation light is incident from the second light-emitting element onto the first incident surface; And a second incident surface, which faces in the opposite direction to the first incident surface, the auxiliary excitation light is incident from the optical element onto the second incident surface, the second incident surface functions as an exit surface that emits the wavelength-converted light toward the optical element.

2. The light source device according to claim 1, characterized in that, The light source device further includes a fourth light-emitting element, which is electrically connected to the circuit board and emits a fourth light with a fourth wavelength different from the first, second, and third wavelengths. The circuit board also has a fourth opening that penetrates the first surface and the second surface. The fourth light-emitting element is disposed within the heat-diffusing element exposed in the fourth opening.

3. The light source device according to claim 2, characterized in that, The heat diffusion element has multiple regions exposed inside each of the first opening, the second opening, the third opening, and the fourth opening. A reflective film is provided in at least one of the plurality of regions.

4. The light source device according to any one of claims 1 to 3, characterized in that, The light source device also includes a light-combining optical system that combines the first light emitted from the first light-emitting element and the wavelength-converted light emitted from the wavelength-converting element. The heat diffusion element has: A first extension, extending in a first direction, is provided with the first light-emitting element and the second light-emitting element; and The second extension, which extends from the first extension in a second direction intersecting the first direction, is provided with the third light-emitting element. The optical synthesis system will synthesize at least the first light and the wavelength-converted light to obtain a synthesized light that is emitted in the first direction or the second direction.

5. The light source device according to any one of claims 1 to 3, characterized in that, The heat diffusion element has: The first extension extends in a first direction and is provided with one of the first light-emitting element and the third light-emitting element; The second extension, which is disposed opposite to the first extension and extends in the first direction, is provided with the other of the first light-emitting element and the third light-emitting element; as well as The third extension, which connects to the first extension's end in the first direction and the second extension's end in the first direction, is provided with the second light-emitting element. The optical element transmits the wavelength-converted light and reflects the first light, and then emits the composite light obtained by combining the first light and the wavelength-converted light in the first direction.

6. The light source device according to any one of claims 1 to 3, characterized in that, The heat diffusion element is a vapor chamber.

7. The light source device according to claim 6, characterized in that, The steam chamber has: A heating plate that supports the first light-emitting element; A heat sink, disposed on the side of the heat-receiving plate opposite to the first light-emitting element; and Multiple connecting components thermally connect the heated plate to the heat sink.

8. The light source device according to claim 7, characterized in that, When viewed from above, a portion of the plurality of connecting components is positioned at a location overlapping the first light-emitting element in the heated plate.

9. The light source device according to any one of claims 1 to 3, characterized in that, The light source device also includes: A focusing lens that parallelizes the first light emitted from the first light-emitting element; and A lens support component, disposed on the first surface of the circuit board, supports the condenser lens. The lens support component is a ring-shaped component. The first light-emitting element is housed in the space defined by the condensing lens, the lens support component, the circuit board, and the heat diffusion element.

10. A projector, characterized in that, The projector has: The light source device according to any one of claims 1 to 9; An optical modulation device that modulates light from the light source device according to image information to form image light; as well as A projection optical device that projects the image light.

Images