Light source device and projector

Abstract

A light source device and a projector capable of suppressing generation of adverse conditions caused by attachment of dust intruding into the inside. The light source device of the present invention has: a light source unit; a wavelength conversion unit having a wavelength conversion wheel that emits wavelength-converted light obtained by wavelength-converting excitation light from a first face and a wheel housing that houses the wavelength conversion wheel with a part of the wavelength conversion wheel exposed; and an optical unit having a condensing optical system, a pickup optical system, and an optical housing that holds the condensing optical system and the pickup optical system. The light source unit and the optical unit are fixed in a sealed state, and in the optical unit and the wavelength conversion unit, the part of the wavelength conversion wheel exposed via a first opening portion of the wheel housing is disposed on an optical path between the condensing optical system and the pickup optical system via a second opening portion of the optical housing, and the second opening portion of the optical housing and the first opening portion of the wheel housing are fixed in a sealed state.

Description

TECHNICAL FIELD

[0001] The present application relates to a light source device and a projector. BACKGROUND

[0002] A projector described in Patent Document 1 below cools a semiconductor laser and a fluorescent wheel, which are constituent components of a light source device, by a cooling device.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2016-51073

[0004] However, in the above-described projector, dust that has intruded into the inside adheres to a lens and a fluorescent wheel of the light source device, and there is a problem of degradation and heat generation of components. SUMMARY

[0005] To solve the above-described problem, according to a first aspect of the present application, there is provided a light source device including: a light source unit having a light emitting element; a wavelength conversion unit having: a wavelength conversion wheel that, from a first face, emits excitation light emitted from the light emitting element and emits wavelength-converted light obtained by wavelength-converting the excitation light from a second face opposite to the first face; and a wheel housing that houses the wavelength conversion wheel and includes a first opening portion that exposes a portion of the wavelength conversion wheel; and an optical unit having: a condensing optical system including a first lens that condenses the excitation light on the wavelength conversion wheel; a pickup optical system that picks up the wavelength-converted light; and an optical housing that includes a second opening portion that receives a portion of the wavelength conversion wheel, and holds the condensing optical system and the pickup optical system in such a manner that a portion of the wavelength conversion wheel exposed via the first opening portion of the wheel housing is disposed on an optical path between the condensing optical system and the pickup optical system via the second opening portion of the optical housing, the second opening portion of the optical housing and the first opening portion of the wheel housing being fixed in a sealed state.

[0006] According to a second aspect of the present application, there is provided a projector including: the light source device of the first aspect; an image forming device that forms light output from the light source device into image light; and a projection optical device that projects the image light output from the image forming device. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 FIG. 1 is a diagram showing the overall structure of a projector of a first embodiment.

[0008] Figure 2 is an exploded perspective view showing a mounting state of the light source device.

[0009] Figure 3 is an exploded perspective view showing a structure of the light source device.

[0010] Figure 4 is a sectional view showing a structure of the light source device.

[0011] Figure 5 is a perspective view showing a structure of the wavelength conversion unit.

[0012] Figure 6A is a view showing a structure of a light incident surface side of the wavelength conversion wheel.

[0013] Figure 6B is a view showing a structure of a light emission surface side of the wavelength conversion wheel.

[0014] Figure 7 is a perspective view showing a structure of the optical housing.

[0015] Figure 8A is a side view of the optical housing viewed from the -X side.

[0016] Figure 8B is a side view of the optical housing viewed from the +X side.

[0017] Figure 9 is a sectional view viewed in the direction of the XI-XI line of Figure 4 .

[0018] Figure 10 is a perspective view showing a structure of a section of a face including the X-X line of Figure 4 .

[0019] Figure 11 is a perspective view showing an outline structure of the light source device of the second embodiment.

[0020] Figure 12 is a plan view showing a structure of the light source device of the second embodiment.

[0021] Figure 13 is a perspective view showing an outline structure of the light source device of the third embodiment.

[0022] Figure 14 is an exploded perspective view showing a structure of the light source device of the third embodiment.

[0023] Figure 15A is a bottom view of the optical housing of the third embodiment viewed from the -Z side.

[0024] Figure 15B is a bottom view of the optical housing of the third embodiment viewed from the +Z side.

[0025] Explanation of signs

[0026] 1: projector; 2, 2A, 2B: light source device; 3: image forming device; 6: projection optical device; 20: light source unit; 21: light emitting element; 22: mounting substrate; 23: base member; 30: wavelength conversion unit; 31: wavelength conversion wheel; 32: wheel housing; 33: wheel opening portion (first opening portion); 40, 140: optical unit; 50A: first cooling portion; 50B: second cooling portion; 51, 151: heat dissipation portion; 51a, 151a: first heat dissipation portion; 51b, 151b: second heat dissipation portion; 52: heat conduction portion; 52a: first heat conduction portion; 52b: second heat conduction portion; 53: cover; 60: condensing optical system; 60a: first lens; 60b: second lens; 61: pickup optical system; 61a: third lens; 61b: fourth lens; 62, 162: optical housing; 63: prism member (light path changing member); 69: reduced diameter portion; 85: first member; 86: second member; 87: left side opening portion (second opening portion); 88: right side opening portion (third opening portion); 187: lower side opening portion (second opening portion); 188: upper side opening portion (third opening portion); 211: first light emitting element; 212: second light emitting element; 221: first mounting substrate; 222: second mounting substrate; 312a: back surface (first surface); 312b: front surface (second surface); 321: first housing; 322: second housing; B, B1, B2: excitation light; YL: fluorescent light (wavelength converted light). DETAILED DESCRIPTION

[0027] Hereinafter, an embodiment of the present application will be described in detail with reference to the drawings.

[0028] Note that, in the drawings used in the following description, in order to easily understand the features, sometimes a portion to be a feature is enlarged and shown for convenience, and the scale of each constituent element and the like is not necessarily the same as the actual one.

[0029] (First Embodiment)

[0030] Figure 1 is a view showing the overall structure of the projector of the present embodiment.

[0031] The projector 1 of the present embodiment generates image light corresponding to image information by modulating illumination light emitted from the light source device 2, and projects the generated image light onto a projection target such as a screen, enlarged.

[0032] As shown in Figure 1 , the projector 1 has the light source device 2, the image forming device 3, the projection optical device 6, and the outer housing 7.

[0033] The light source device 2 supplies the image forming device 3 with white illumination light WL. The light source device 2 of the present embodiment generates the illumination light WL including fluorescent light generated by wavelength conversion of excitation light emitted from a light source module including a semiconductor laser by a phosphor. The structure of the light source device 2 is described later.

[0034] The image forming device 3 includes light modulation panels 10R, 10G, 10B and a cross dichroic prism 11. The light modulation panels 10R, 10G, 10B form image light by modulating color light incident thereto according to image information, respectively. The light modulation panels 10R, 10G, 10B are each composed of a light-transmissive liquid crystal panel.

[0035] The cross dichroic prism 11 synthesizes the image light emitted from each of the light modulation panels 10R, 10G, 10B. The cross dichroic prism 11 has a substantially square shape in plan view in which four right-angle prisms are bonded, and a dielectric multilayer film is provided at a substantially X-shaped interface in which the right-angle prisms are bonded to each other.

[0036] According to such a structure, the image forming device 3 of the present embodiment generates full-color image light by synthesizing the image light of each color.

[0037] In the present embodiment, field lenses 12R, 12G, 12B are provided on the light incident side of each of the light modulation panels 10R, 10G, 10B.

[0038] In addition, although not illustrated, an incident-side polarizing plate is disposed between each of the light modulation panels 10R, 10G, 10B and each of the field lenses 12R, 12G, 12B, and an emission-side polarizing plate is disposed between each of the light modulation panels 10R, 10G, 10B and the cross dichroic prism 11.

[0039] In the present embodiment, the image forming device 3 further includes a color separation optical system 4 and a uniform illumination optical system 5.

[0040] The illumination light WL emitted from the light source device 2 is incident to the uniform illumination optical system 5.

[0041] The uniform illumination optical system 5 has a first lens array 5a, a second lens array 5b, a polarization conversion element 5c, and a superposition lens 5d.

[0042] The first lens array 5a includes a plurality of first lenslets for dividing the illumination light WL incident from the light source device 2 into a plurality of partial light beams. The plurality of first lenslets are arranged in an array in a plane perpendicular to an optical axis AX1 of the illumination light WL.

[0043] The second lens array 5b includes a plurality of second small lenses corresponding to the plurality of first small lenses of the first lens array 5a. The plurality of second small lenses are arranged in an array in a plane perpendicular to the optical axis AX1.

[0044] The second lens array 5b, together with the superposition lens 5d, images the image of each first small lens of the first lens array 5a in the vicinity of the image forming region of the light modulating panel 10R, 10G, 10B, respectively.

[0045] The polarization conversion element 5c converts the light emitted from the second lens array 5b into linearly polarized light in one direction. The polarization conversion element 5c has, for example, a polarization separation film and a phase difference plate, which are not shown.

[0046] The superposition lens 5d condenses each partial light beam emitted from the polarization conversion element 5c and causes them to overlap in the vicinity of the image forming region of the light modulating panel 10R, 10G, 10B, respectively.

[0047] The color separation optical system 4 separates the illumination light WL passing through the uniform illumination optical system 5 into red light LR, green light LG, and blue light LB, and guides them to the light modulating panels 10R, 10G, 10B, respectively. The color separation optical system 4 has a first dichroic mirror 41, a second dichroic mirror 42, a first mirror 43, a second mirror 44, a third mirror 45, a first relay lens 46, and a second relay lens 47.

[0048] The first dichroic mirror 41 reflects the red light LR and transmits the green light LG and the blue light LB. The second dichroic mirror 42 reflects the green light LG among the green light LG and the blue light LB transmitted through the first dichroic mirror 41 and transmits the blue light LB. The first mirror 43 reflects the red light LR. The second mirror 44 and the third mirror 45 reflect the blue light LB. The first relay lens 46 is disposed between the second dichroic mirror 42 and the second mirror 44, and the second relay lens 47 is disposed between the second mirror 44 and the third mirror 45.

[0049] The projection optical device 6 is composed of a projection lens group that condenses the image light synthesized by the cross dichroic prism 11 of the image forming device 3. In addition, although not shown, a lens shift mechanism that shifts the optical axis AX2 of the projection optical device 6 can be provided at the connecting portion of the projection optical device 6 and the cross dichroic prism 11 of the image forming device 3.

[0050] According to such a configuration, the projector 1 of the present embodiment is capable of projecting the image light generated by the image forming device 3 toward a projection surface such as a screen, magnified. Thereby, a color image magnified is displayed on the screen.

[0051] The outer casing 7 houses the light source device 2 and the image forming device 3 inside and constitutes the outer covering of the projector 1.

[0052] (Light source device)

[0053] Next, the structure of the light source device 2 will be described.

[0054] Figure 2 2 is an exploded perspective view showing the state in which the light source device 2 is mounted on the outer casing 7. Figure 2 In FIG. 1 , in order to illustrate the internal structure of the projector 1 , the bottom plate portion 17 as a part of the exterior casing 7 is shown.

[0055] In the following description of the light source device, an XYZ vertical coordinate system is used as needed.

[0056] In each figure, the Y axis is a line from the light source device 2 toward Figure 1 The illustrated axis is the optical axis AX1 of the illumination light WL emitted from the image forming device 3. The Z axis is perpendicular to the Y axis and to the surface of the bottom plate 17 of the outer casing 7. The X axis is perpendicular to the Y axis and the Z axis.

[0057] In addition, in this embodiment, for example, the direction along the Z axis is called the "upper and lower directions Z" of the light source device 2, +Z is called the "upper side", -Z is called the "lower side", the direction along the X axis is called the "left and right direction X" in the light source device 2, the back side opposite to the front side of the projector 1 on which the projection optical device 6 is provided, that is, +X is called the "right side", the front side of the projector 1, that is, -X is called the "left side", and the direction along the Y axis is called the "front and rear direction Y" of the light source device 2, +Y is called the "front side", and -Y is called the "back side" for explanation.

[0058] The vertical direction Z, the horizontal direction X, and the front-rear direction Y are merely names used to describe the arrangement relationship of components of the light source device 2 , and do not define the actual installation postures and directions of the light source device 2 and the projector 1 .

[0059] like Figure 2 As shown, the light source device 2 of the present embodiment is retained on the bottom plate portion 17 of the outer casing 7 via a screw component 9. The bottom plate portion 17 has a light source retaining component 18 for retaining the light source device 2. The light source retaining component 18 includes a plurality of threaded fastening portions 18a protruding from the bottom plate portion 17 toward the upper side +Z and a plurality of positioning portions 18b protruding from the bottom plate portion 17 toward the upper side +Z. The plurality of threaded fastening portions 18a are locations for fastening the screw component 9. The plurality of positioning portions 18b are pins for positioning the light source device 2 at a specified position relative to the bottom plate portion 17, and at least two are provided. In addition, the number and arrangement of the threaded fastening portions 18a and the positioning portions 18b are not limited to Figure 2 The illustrated embodiment can be modified as appropriate according to the structure of the light source device 2 .

[0060] The light source device 2 of the present embodiment includes a light source unit 20, a wavelength conversion unit 30, a cooling unit 50, and an optical unit 40. The cooling unit 50 includes a first cooling portion 50A that cools the light source unit 20 and a second cooling portion 50B that cools the optical unit 40.

[0061] The first cooling portion 50A includes a first heat dissipation portion 51a and a first heat conducting portion 52a. The second cooling portion 50B includes a second heat dissipation portion 51b and a second heat conducting portion 52b. In the present embodiment, the first heat dissipation portion 51a and the second heat dissipation portion 51b are collectively referred to as a heat dissipation portion 51, and the first heat conducting portion 52a and the second heat conducting portion 52b are collectively referred to as a heat conducting portion 52. That is, the cooling unit 50 includes the heat dissipation portion 51 that is arranged side by side with the optical unit 40, and the heat conducting portion 52 that conducts heat received by the base member 23 of the light source unit 20 to the heat dissipation portion 51.

[0062] In the present embodiment, the heat dissipation portion 51 is arranged side by side with the left side -X of the light source unit 20 as viewed from the +Y side.

[0063] The first heat conducting portion 52a thermally connects the first heat dissipation portion 51a and the base member 23 of the light source unit 20. Thermal connection refers to a state in which two members are connected in a manner that allows heat transfer therebetween, and other members can be interposed between the two members as long as heat transfer is possible between the two members.

[0064] Heat received by the base member 23 is conducted to the first heat dissipation portion 51a via the first heat conducting portion 52a. The first heat dissipation portion 51a is composed of a heat sink having a plurality of fins, and releases heat conducted from the first heat conducting portion 52a. As the first heat conducting portion 52a, for example, in addition to graphite, copper, or the like, a heat pipe that utilizes evaporation and condensation of a refrigerant, a steam chamber, or the like can be used. In the case of the present embodiment, the first heat conducting portion 52a is composed of a heat pipe.

[0065] The second heat dissipation portion 51b is arranged side by side with the left side -X of the light source unit 20 and the upper side +Z of the first heat dissipation portion 51a as viewed from the +Y side.

[0066] The second heat conducting portion 52b thermally connects the second heat dissipation portion 51b and a cover 53 provided to the optical unit 40. The cover 53 is composed of a metal plate member made of metal having excellent thermal conductivity.

[0067] Heat received by the cover 53 is conducted to the second heat dissipation portion 51b via the second heat conducting portion 52b. The second heat dissipation portion 51b is composed of a heat sink having a plurality of fins, and releases heat conducted from the second heat conducting portion 52b. As the second heat conducting portion 52b, for example, in addition to graphite, copper, or the like, a heat pipe that utilizes evaporation and condensation of a refrigerant, a steam chamber, or the like can be used. In the case of the present embodiment, the second heat conducting portion 52b is composed of a heat pipe.

[0068] Figure 3 It is an exploded perspective view showing the structure of the light source device 2 . Figure 4 It is a cross-sectional view showing the structure of the light source device 2 . Figure 4 It is a cross-sectional view taken along the left-right direction X of an optical axis AX3 of a light-collecting optical system 60 described later.

[0069] like Figure 3 and Figure 4 As shown in FIG. 1 , the light source device 2 of this embodiment includes a light source unit 20, an optical unit 40, and a wavelength conversion unit 30. Figure 3 as well as Figure 4 In order to make the drawings easier to see, the cooling unit 50 is omitted.

[0070] (Light source unit)

[0071] First, the structure of the light source unit 20 will be described.

[0072] like Figure 3 and Figure 4 As shown, the light source unit 20 includes a plurality of light emitting elements 21, a plurality of mounting substrates 22, and a base member 23. The plurality of light emitting elements 21 include a first light emitting element 211 and a second light emitting element 212. The plurality of mounting substrates 22 include a first mounting substrate 221 on which the first light emitting element 211 is mounted and a second mounting substrate 222 on which the second light emitting element 212 is mounted.

[0073] The base member 23 is fixed to the optical unit 40 via screw members 24. The base member 23 includes a fixing portion 23a fixed to the light source unit 20 and a recessed portion 23b recessed from the surface of the fixing portion 23a toward the rear side -Y. In this embodiment, the fixing portion 23a is separated into two parts in the left-right direction X by the recessed portion 23b.

[0074] The base member 23 places the first mounting substrate 221 and the second mounting substrate 222 on the recess 23 b. According to the present embodiment, the base member 23 has the recess 23 b, which ensures space for mounting the first mounting substrate 221 and the second mounting substrate 222 between the base member 23 and the optical unit 40.

[0075] In the case of this embodiment, if Figure 3 As shown, the base member 23 carries two first mounting substrates 221 and two second mounting substrates 222. The two first mounting substrates 221 are placed on the base member 23 so as to be aligned in the vertical direction Z, and the two second mounting substrates 222 are placed on the base member 23 so as to be aligned in the vertical direction Z. The first mounting substrates 221 and the second mounting substrates 222 are placed on the base member 23 so as to be adjacent to each other in the horizontal direction X.

[0076] Two first light emitting elements 211 are mounted on each first mounting substrate 221 so as to be aligned in the left-right direction X. The number of first light emitting elements 211 mounted on the first mounting substrate 221 is not limited thereto.

[0077] like Figure 4 As shown, the first light emitting element 211 includes, for example, a plurality of laser elements and a collimating lens. The first light emitting element 211 emits excitation light B1 consisting of, for example, blue light having a peak wavelength in the range of 380 nm to 495 nm.

[0078] One second light emitting element 212 is mounted on each second mounting substrate 222. The number of second light emitting elements 212 mounted on the second mounting substrate 222 is not limited thereto.

[0079] The second light-emitting element 212 has the same structure as the first light-emitting element 211. The second light-emitting element 212 includes, for example, multiple laser elements and a collimating lens. Like the first light-emitting element 211, the second light-emitting element 212 emits excitation light B2, for example, consisting of blue light having a peak wavelength in the range of 380 nm to 495 nm.

[0080] Based on such a configuration, the light source unit 20 emits the excitation light B including the plurality of excitation lights B1 and B2 toward the optical unit 40 .

[0081] like Figure 3 As shown, the recess 23b extends through the base member 23 in the vertical direction Z. In the light source unit 20 of this embodiment, the upper +Z and lower -Z ends of the recess 23b are respectively closed by a pair of plates 26. Each plate 26 is fixed to the upper and lower end surfaces of the light source fixing portion 70 by means of screw members 24, for example.

[0082] In this embodiment, a sheet-shaped sealing member 27 is provided between the plate 26 and the base member 23. Figure 4 As shown, a plate-shaped sealing member 27 is disposed between the base member 23 of the light source unit 20 and the holding surface 71 of the light source fixing portion 70. Specifically, the base member 23 of the light source unit 20 and the optical housing 62 of the optical unit 40 are fixed together in a sealed state. This prevents dust from entering the recess 23b of the base member 23 through the gap between the optical housing 62 and the base member 23. Consequently, the occurrence of adverse effects such as heat generation caused by dust adhering to the first and second light-emitting elements 211 and 212 mounted in the recess 23b is suppressed.

[0083] (Optical unit)

[0084] Next, the structure of the optical unit 40 will be described.

[0085] As shown in Figure 4 , the optical unit 40 has a condensing optical system 60, a pickup optical system 61, an optical case 62 that holds the condensing optical system 60 and the pickup optical system 61, a diffusion plate 65, and a cover 53.

[0086] The condensing optical system 60 includes a plurality of lenses. The condensing optical system 60 of the present embodiment is composed of two convex lenses composed of a first lens 60a and a second lens 60b. Note that the number of lenses that compose the condensing optical system 60 is not particularly limited.

[0087] The first lens 60a is disposed opposite to the light source unit 20. That is, the first lens 60a is the lens of the condensing optical system 60 that is closest to the light incident side.

[0088] The second lens 60b is disposed on the side opposite to the light source unit 20 of the first lens 60a, that is, on the light exit side of the first lens 60a.

[0089] In the condensing optical system 60 of the present embodiment, the diameter of the second lens 60b on the wavelength conversion wheel 31 side is smaller than the diameter of the first lens 60a on the light incident side of the second lens 60b. That is, the outer diameter in the radial direction perpendicular to the optical axis AX3 of the condensing optical system 60 of each lens 60a, 60b that composes the condensing optical system 60 becomes larger as it is farther from the wavelength conversion unit 30. Note that the optical axis AX3 coincides with the optical axes of the first lens 60a and the second lens 60b that compose the condensing optical system 60. Further, as shown in Figure 3 , the optical axis AX3 of the condensing optical system 60 coincides with the optical axis AX1 of the illumination light WL emitted from the light source device 2.

[0090] The condensing optical system 60 of the present embodiment further includes a prism member 63 as a light path changing member. The prism member 63 is disposed opposite to the second light emitting element 212 and not opposite to the first light emitting element 211 with respect to the light source unit 20.

[0091] In the case of the present embodiment, in the first direction, that is, the left-right direction X that crosses the optical axis AX3 of the condensing optical system 60 including the first lens 60a, the wavelength conversion unit 30 is disposed on one side of the left side -X of the left-right direction X with respect to the optical case 62 as viewed from the +Y side. Further, the prism member 63 is disposed on the other side of the right side +X of the left-right direction X within the optical case 62.

[0092] That is, in the case of the present embodiment, the wavelength conversion unit 30 is disposed on the left side -X opposite to the right side +X where the prism member 63 is provided within the optical case 62 with respect to the optical case 62.

[0093] In this embodiment, if Figure 4 As shown, the excitation light B1 emitted from the first light-emitting element 211 is directly incident on the first lens 60a of the condensing optical system 60. That is, the excitation light B1 does not enter the prism component 63, but enters the first lens 60a of the condensing optical system 60. On the other hand, the excitation light B2 emitted from the second light-emitting element 212 is incident on the first lens 60a via the prism component 63.

[0094] The prism member 63 is a member that changes the optical path of the excitation light B2 emitted from the second light emitting element 212 .

[0095] The prism member 63 of this embodiment is composed of a prism member having a parallelogram shape in plan view.

[0096] The prism component 63 includes a first reflecting surface 63a and a second reflecting surface 63b separated in the left-right direction X where the first light-emitting element 211 and the second light-emitting element 212 are arranged. The first reflecting surface 63a is arranged on the optical axis of the excitation light B2 emitted by the second light-emitting element 212. The first reflecting surface 63a reflects the excitation light B2 emitted by the second light-emitting element 212 toward the left side -X. In other words, the first reflecting surface 63a reflects the excitation light B2 emitted by the second light-emitting element 212 in a direction closer to the excitation light B1 emitted by the first light-emitting element 211. The excitation light B2 reflected by the first reflecting surface 63a is incident on the second reflecting surface 63b.

[0097] The second reflecting surface 63 b reflects the excitation light B2 reflected from the first reflecting surface 63 a along the optical axis of the first light emitting element 211 and causes the light to enter the first lens 60 a .

[0098] Thus, the optical path of the excitation light B2 passing through the prism member 63 is shifted to the left -X compared to before passing through the prism member 63. Therefore, the prism member 63 can reduce the beam width in the left-right direction X of the excitation light B including the plurality of excitation lights B1 and B2.

[0099] The second reflective surface 63b of the prism component 63 is located between the first lens 60a and the first mounting substrate 221 in the front-to-back direction Y along the optical axis AX3 of the first lens 60a of the converging optical system 60. Specifically, the second reflective surface 63b of the prism component 63 is arranged so as to overlap with the first mounting substrate 221 when viewed from above along the front-to-back direction Y. Thus, the second reflective surface 63b of the prism component 63 is positioned closer to the optical axis of the first lens 60a. Furthermore, the second reflective surface 63b does not overlap with the first light-emitting element 211 when viewed from above, and therefore does not block the excitation light B1 incident on the first lens 60a.

[0100] Here, a case is considered in which the second reflecting surface 63b is disposed at a position overlapping the second mounting substrate 222 in the front-rear direction Y or at a position overlapping the gap between the first mounting substrate 221 and the second mounting substrate 222.

[0101] In this case, the second reflecting surface 63b of the prism member 63 is disposed at a position farther from the optical axis of the first lens 60a, and thus the beam width of the excitation light B cannot be sufficiently reduced. Therefore, the lens diameter of the first lens 60a needs to be increased due to the expansion of the beam width of the excitation light B, resulting in the large size of the light source device 2.

[0102] In contrast, in the case of the present embodiment, as described above, the second reflecting surface 63b of the prism member 63 is disposed at a position closer to the optical axis of the first lens 60a, and thus the lens diameter of the first lens 60a into which the excitation light B is incident is smaller, and the miniaturization of the light source device 2 can be achieved.

[0103] According to such a configuration, the condensing optical system 60 of the present embodiment can condense the excitation light B emitted from the light source unit 20 and make it incident on the wavelength conversion wheel 31 of the wavelength conversion unit 30. The configuration of the wavelength conversion unit 30 will be described later.

[0104] In the case of the present embodiment, a diffusion plate 65 is disposed between the condensing optical system 60 on the optical path of the excitation light B and the wavelength conversion unit 30. The diffusion plate 65 diffuses the excitation light B to homogenize the light intensity distribution of the excitation light B on the wavelength conversion wheel 31. As the diffusion plate 65, a publicly known diffusion plate such as ground glass, a holographic diffuser, a diffusion plate on which a sandblasting process is performed on the surface of a transparent substrate, a diffusion plate in which a scattering material like a bead is dispersed in the inside of a transparent substrate and light is scattered by the scattering material, or the like can be used.

[0105] The wavelength conversion unit 30 emits fluorescent light Y as wavelength-converted light after wavelength conversion of the excitation light B. The fluorescent light Y emitted from the wavelength conversion unit 30 is incident on the pickup optical system 61.

[0106] The pickup optical system 61 picks up the wavelength-converted light emitted from the wavelength conversion wheel 31 and converts it into parallel light.

[0107] The pickup optical system 61 of the present embodiment includes a plurality of lenses. The pickup optical system 61 of the present embodiment is composed of three convex lenses composed of a third lens 61a, a fourth lens 61b, and a fifth lens 61c. The number of lenses constituting the pickup optical system 61 is not particularly limited.

[0108] The third lens 61a is disposed in opposition to the wavelength conversion unit 30. That is, the third lens 61a is the lens closest to the light incident side among the pickup optical system 61.

[0109] The fourth lens 61b is disposed on the side opposite to the light source unit 20 of the third lens 61a, that is, on the light exit side of the third lens 61a.

[0110] The fifth lens 61c is disposed on the side opposite to the light source unit 20 of the fourth lens 61b, that is, on the light exit side of the fourth lens 61b.

[0111] In the pickup optical system 61 of the present embodiment, the diameter of the third lens 61a on the side of the wavelength conversion wheel 31 is smaller than the diameter of the fourth lens 61b on the light exit side of the third lens 61a. In addition, the diameter of the fourth lens 61b is smaller than the diameter of the fifth lens 61c on the light exit side of the fourth lens 61b. That is, the respective lenses 61a, 61b, 61c constituting the pickup optical system 61 become larger in the outer diameter in the radial direction perpendicular to the optical axis of the pickup optical system 61 as they are farther away from the wavelength conversion unit 30. In addition, the optical axis of the pickup optical system 61 coincides with the optical axis AX3 of the condensing optical system 60.

[0112] (Wavelength conversion unit)

[0113] Next, the structure of the wavelength conversion unit 30 will be described. Figure 5 is a perspective view showing the structure of the wavelength conversion unit 30. Figure 6A is a view showing the structure on the light incident surface side of the wavelength conversion wheel 31, Figure 6B is a view showing the structure on the light exit surface side of the wavelength conversion wheel 31.

[0114] As shown in Figure 5 , the wavelength conversion unit 30 includes a wavelength conversion wheel 31 and a wheel housing 32.

[0115] As shown in Figure 6A and Figure 6B , the wavelength conversion wheel 31 includes a wheel base plate 311, a wavelength conversion element 312, and a rotation drive section 313. The rotation drive section 313 is constituted by, for example, a motor. The rotation drive section 313 is supplied with electric power via a flexible cable 316. The rotation drive section 313 has a rotation support section 313a that is rotatable about the center axis O. The rotation support section 313a supports the wheel base plate 311 so as to be rotatable about the center axis O.

[0116] The wheel base plate 311 is constituted by, for example, a circular ring-shaped metal plate of aluminum, copper, or the like that has excellent heat dissipation properties.

[0117] The wavelength conversion element 312 is provided along the outer periphery of the wheel base plate 311. The wavelength conversion element 312 is annular about the center axis O and has a circular ring shape that protrudes in a flange shape from the outer periphery of the wheel base plate 311 toward the radially outer side. Here, the radially outer side refers to the direction perpendicular to the center axis O and farther away from the center axis O.

[0118] As Figure 5 shown, the wavelength conversion element 312 emits yellow fluorescent light YL from the front surface 312b by wavelength-converting excitation light B emitted from the light emitting element 21 of the light source unit 20, which is incident from the back surface 312a. That is, the wavelength conversion element 312 is a light-transmissive wavelength conversion element that transmits excitation light B incident from the first surface 312a and emits wavelength-converted light YL from the second surface 312b.

[0119] The wavelength conversion element 312 uses, for example, YAG:Ce in which cerium ions, for example, Ce3+, are added to a garnet crystal of Y3Al5O12 (YAG). In addition, an appropriate scattering element, not shown, can also be included in the wavelength conversion element 312.

[0120] The wavelength conversion wheel 31 of the present embodiment is a so-called transmissive phosphor wheel. Specifically, the wavelength conversion element 312 transmits a part of excitation light B incident from the back surface 312a and emits fluorescent light YL from the front surface 312b. Thus, the wavelength conversion element 312 emits white illumination light WL obtained by synthesizing blue component light BB, which is a part of excitation light B, and fluorescent light YL.

[0121] As Figure 6B shown, the wheel substrate 311 of the present embodiment includes a plurality of fins 314 provided on the back surface 312a side of the wavelength conversion element 312, on which excitation light B is incident. The plurality of fins 314 are provided on the back surface 311b of the wheel substrate 311. The plurality of fins 314 are arranged in a manner extending radially around the central axis O.

[0122] As Figure 6A shown, the wheel substrate 311 of the present embodiment includes a plurality of fins 315 provided on the front surface 312b side of the wavelength conversion element 312, from which excitation light B is emitted. The plurality of fins 315 are provided on the front surface 311a of the wheel substrate 311. Each fin 315 is arranged radially around the central axis O. In the case of the present embodiment, the temperature of the light incident side of the wheel substrate 311 is likely to rise compared to the light emission side, and thus the size of the fins 314 on the light incident side is made larger than the size of the fins 315 on the light emission side. Note that the size relationship of the fins 314, 315 is not limited to this, and the fins 314, 315 can be the same size, or the fins 315 can be larger than the fins 314.

[0123] According to the wavelength conversion wheel 31 of the present embodiment, by the fins 314, 315 provided on both surfaces of the wheel substrate 311, an air current is generated around the wavelength conversion element 312 at the time of rotation, and the wavelength conversion element 312 can be cooled. Thus, by improving the wavelength conversion efficiency of the wavelength conversion element 312, bright fluorescent light YL can be generated.

[0124] like Figure 3 As shown, the wheel housing 32 houses the wavelength conversion wheel 31. The wheel housing 32 includes a first housing 321, a second housing 322, and a wheel sealing member 323 disposed between the first and second housings 321, 322. The first and second housings 321, 322 are fixed to each other in a sealed state via the wheel sealing member 323. The first and second housings 321, 322 are made of a metal member with excellent heat dissipation properties, such as aluminum or stainless steel.

[0125] The first housing 321 is a plate-shaped component with a plurality of heat sinks 120 provided on its surface 321a and a connecting portion 121 extending toward and connected to the second housing 322. The first housing 321 is secured to the second housing 322 via screws 24. Screw holes 321H for inserting the screws 24 are provided at the four corners of the first housing 321. When viewed from the +Y side, the first housing 321 has a notch 121a on its outer edge at the right side (+X). The notch 121a has a roughly mountain-shaped shape.

[0126] The second housing 322 holds the wavelength conversion wheel 31. The wavelength conversion wheel 31 is fixed to the bottom plate 122 of the second housing 322 via screw members (not shown), for example.

[0127] The second housing 322 includes: a bottom plate portion 122 that holds the wavelength conversion wheel 31; a side plate portion 123 that surrounds the outer edge of the bottom plate portion 122 in three directions; a flange portion 124 that is provided on the side of the side plate portion 123 opposite to the bottom plate portion 122; a screw fastening portion 125; and a mounting portion 126. Figure 3 as well as Figure 10 As shown, the second housing 322 is provided with a plurality of heat sinks 130 on the surface of the bottom plate portion 122. Specifically, the wheel housing 32 of this embodiment includes the plurality of heat sinks 130 provided on the surface of the bottom plate portion 122 of the second housing 322 on the side facing the light source unit 20, at positions that do not overlap with the optical housing 62 in the front-to-back direction Y along the optical axis AX3. This can suppress interference between the heat sinks 130 and the optical housing 62, and improve the heat dissipation performance of the wheel housing 32.

[0128] like Figure 3 As shown, the bottom plate portion 122 has a cutout 122a at its outer edge not surrounded by the side plate portions 123. The cutout 122a has a generally mountain-shaped shape. Furthermore, the shape of the cutout 122a of the bottom plate portion 122 corresponds to the shape of the cutout 121a of the first housing 321. That is, when viewed from above from the wheel housing 32, the cutouts 121a and 122a overlap.

[0129] The flange portion 124 is located opposite the first housing 321 and has a generally C-shaped plan view. Each end of the flange portion 124 has an inwardly extending portion that overlaps the outer shape of the bottom plate portion 122 when viewed from above. Furthermore, the wheel seal 323 is provided along the shape of the flange portion 124.

[0130] The screw fastening portion 125 is a portion for fastening the screw member 24 that fixes the first housing 321 to the second housing 322 . The screw fastening portion 125 is integrally provided with a portion of the flange portion 124 .

[0131] like Figure 3 As shown, the mounting portion 126 is a member for fixing the wavelength conversion wheel 31 of the wavelength conversion unit 30 to the optical housing 62 of the optical unit 40 using the screw member 24 .

[0132] like Figure 5 As shown, the mounting portion 126 includes a front mounting portion 127 as a first mounting portion and a rear mounting portion 128 as a second mounting portion.

[0133] The front-side mounting portion 127 includes a pair of front-side mounting plates 127a attached to each extension 124a of the flange portion 124. Each front-side mounting plate 127a is provided with a threaded hole 127b for inserting a screw member 24. Each front-side mounting plate 127a is disposed perpendicular to the extension 124a and opposite the mounting plate 83 of the mounting portion 80 of the optical housing 62. The front-side mounting plates 127a are arranged in a row in the vertical direction Z. Specifically, the threaded holes 127b of each front-side mounting plate 127a are positioned identically in the horizontal direction X.

[0134] The rear mounting portion 128 is provided on the rear side -Y of the bottom plate 122 of the second housing 322, which is opposite to the first housing 321. The rear mounting portion 128 includes a pair of rear mounting plates 128a. Each rear mounting plate 128a has a threaded hole 128b for inserting a screw member 24.

[0135] Each rear-side mounting plate 128a is provided perpendicular to the bottom plate portion 122 and faces the mounting plate 83 of the mounting portion 80 of the optical housing 62. The rear-side mounting plates 128a are arranged in a row in the vertical direction Z. Specifically, the screw holes 128b of each rear-side mounting plate 128a are positioned at the same position in the horizontal direction X.

[0136] The front mounting plate 127a and the back mounting plate 128a arranged in the front-back direction Y are positioned at the same position in the up-down direction Z. Specifically, the screw holes 127b of the front mounting plate 127a and the screw holes 128b of the back mounting plate 128a are positioned at the same position in the up-down direction Z.

[0137] like Figure 5 As shown, the wheel housing 32 of this embodiment houses the wavelength conversion wheel 31 so as to expose a portion of the wavelength conversion wheel 31. The wheel housing 32 has a wheel opening 33 as a first opening for exposing a portion of the wavelength conversion wheel 31.

[0138] The wheel opening 33 is formed by at least one of the first housing 321 and the second housing 322. The wheel opening 33 is comprised of the end surface of the portion of the first housing 321 where the cutout 121a is formed, the end surface of the extension 124a of the second housing 322, the end surface of the side plate 123, and the end surface of the portion of the bottom plate 122 where the cutout 122a is formed. In other words, in this embodiment, the wheel opening 33 is comprised of the first housing 321 and the second housing 322. Hereinafter, the end surfaces of the first and second housings 321, 322 that form the wheel opening 33 are referred to as "wheel opening end surfaces 32a."

[0139] like Figure 5 and Figure 6A As shown, the wavelength conversion element 312 as a part of the wavelength conversion wheel 31 is in a state of protruding outward from the wheel opening end surface 32 a of the wheel housing 32 through the wheel opening portion 33 .

[0140] Next, the specific structure of the optical housing 62 will be described.

[0141] Figure 7 1 is a perspective view showing the structure of the rear side -Y of the optical housing 62 .

[0142] Figure 8A and Figure 8B 1 is a side view showing the structure of a main part of the optical housing 62 . Figure 8A is a side view of the optical housing 62 viewed from the -X side, Figure 8B This is a side view of the optical housing 62 as viewed from the +X side.

[0143] Figure 9 It is along Figure 4 Cross-sectional view viewed along line XI-XI. Figure 10 It is shown that Figure 4 A three-dimensional diagram of the structure of the cross section taken along line XX.

[0144] like Figure 7 As shown, the optical housing 62 includes a mounting portion 80, a first component 85, and a second component 86. In this embodiment, the mounting portion 80, the first component 85, and the second component 86 are formed as one body. That is, the optical housing 62 of this embodiment is composed of a single component. Figure 3 and Figure 4As shown, the first member 85 is a member that holds the condensing optical system 60 , and the second member 86 is a member that holds the pickup optical system 61 .

[0145] like Figure 2 As shown, the optical housing 62 has a holding portion 64 that is held by the light source holding member 18 of the outer housing 7 via a screw member 9. Figure 2 As shown, the holding portion 64 includes a screw fixing hole 64 a for inserting the screw member 9 fastened to the screw fastening portion 18 a of the light source holding member 18 , and a positioning hole 64 b for inserting the positioning portion 18 b of the light source holding member 18 .

[0146] like Figure 8A and Figure 8B As shown, the first component 85 includes a light source fixing portion 70 and a first cylindrical portion 90. The light source unit 20 is fixed to the light source fixing portion 70 via a screw member 24 (see Figure 3 ).

[0147] like Figure 7 As shown, the light source fixing portion 70 has a holding surface 71, a screw fastening portion 72 and a pair of positioning pins 73. Figure 3 and Figure 4 As shown, the holding surface 71 holds the base member 23 of the light source unit 20. The screw fastening portions 72 are provided at the four corners of the rectangular holding surface 71 and are the locations where the screw members 24 that fix the light source unit 20 are fastened. A pair of positioning pins 73 are provided on both sides of the holding surface 71 in the left-right direction X and at positions corresponding to the center in the up-down direction Z. Figure 3 and Figure 4 As shown, a pair of positioning pins 73 are inserted into the positioning holes 23 a 1 formed in the fixing portion 23 a of the base member 23 , thereby positioning the base member 23 of the light source unit 20 relative to the light source fixing portion 70 .

[0148] In addition, if Figure 4 and Figure 7 As shown, the optical housing 62 of this embodiment includes a prism support portion 74 as a first support portion for supporting the prism member 63 of the condensing optical system 60 . The prism support portion 74 is provided on the light source fixing portion 70 .

[0149] The prism support portion 74 is recessed from the holding surface 71 that holds the light source unit 20 toward the wavelength conversion wheel 31 side. The prism support portion 74 has a support surface 74a that supports the prism member 63. In the case of the present embodiment, a pair of support members 74b that support the prism member 63 is provided on the support surface 74a of the prism support portion 74. The pair of support members 74b are each a plate-like portion that extends in the left-right direction X and is provided on the support surface 74a so as to be spaced apart in the up-down direction Z. Based on this structure, the prism support portion 74 is able to stably support the prism member 63 at a prescribed position on the support surface 74a via the pair of support members 74b.

[0150] As shown in FIG. 6, the prism member 63 is disposed to the right +X relative to the optical axis AX3 of the condensing optical system 60 as viewed from the position of the +Y side. In addition, the center of the light source unit 20 is to the right +X relative to the optical axis AX3. Therefore, in the left-right direction X, the distance from the optical axis AX3 to the end surface of the light source fixing portion 70 of the optical housing 62 on the left -X side is shorter than the distance from the optical axis AX3 to the end surface of the light source fixing portion 70 of the optical housing 62 on the right +X side. That is, the amount by which the optical housing 62 protrudes to the right +X relative to the optical axis AX3 is greater than the amount by which the optical housing 62 protrudes to the left -X relative to the optical axis AX3. Figure 4 The first cylindrical portion 90 of the optical housing 62 has a lens support portion 91 that is a second support portion and a diffusion plate support portion 92. The lens support portion 91 is provided on the inner surface side of the first cylindrical portion 90 and is recessed from the support surface 74a of the prism support portion 74 toward the wavelength conversion wheel 31 side.

[0151] The lens support portion 91 includes a first stepped portion 91a that supports the first lens 60a and a second stepped portion 91b that supports the second lens 60b.

[0152] The first stepped portion 91a is constituted by the step difference between the first inner peripheral surface 90a of the first cylindrical portion 90 and the second inner peripheral surface 90b that has a smaller inner diameter than the first inner peripheral surface 90a. The first lens 60a is supported by the lens support portion 91 via the first stepped portion 91a. The first lens 60a can be fixed to the first stepped portion 91a by fitting or can be fixed via an adhesive that is not shown.

[0153] The second stepped portion 91b is the step difference between the third inner peripheral surface 90c that has a smaller inner diameter than the second inner peripheral surface 90b and the fourth inner peripheral surface 90d that has a smaller inner diameter than the third inner peripheral surface 90c. The second lens 60b is supported by the lens support portion 91 via the second stepped portion 91b. The second lens 60b can be fixed to the second stepped portion 91b by fitting or can be fixed via an adhesive that is not shown.

[0154]

[0155] ​The diffuser plate support portion 92 is formed by being recessed from the bottom surface of the lens support portion 91 toward the wavelength conversion wheel 31. The diffuser plate support portion 92 includes a support surface 92a for supporting the diffuser plate 65 and an opening 92b provided in the support surface 92a. The opening 92b allows the excitation light B that has passed through the diffuser plate 65 to enter the wavelength conversion wheel 31.

[0156] The second component 86 of the optical housing 62 includes a connecting portion 99 and a second cylindrical portion 95. Figure 7 As shown, the connecting portion 99 is provided so as to extend radially outward from the outer edge of the front end +Y of the second cylindrical portion 95 in a direction perpendicular to the optical axis AX3. The connecting portion 99 is a connecting portion that connects the light source device 2 to the optical axis AX3. Figure 1 The components of the uniform illumination optical system 5 are shown.

[0157] With such a configuration, the light source device 2 of the present embodiment can allow the illumination light WL to be efficiently incident on the uniform illumination optical system 5 via the connection portion 99 of the optical housing 62 .

[0158] The second cylindrical portion 95 is mainly composed of a lens support portion 96 that supports the pickup optical system 61. The lens support portion 96 is provided on the inner surface of the second cylindrical portion 95. The lens support portion 96 includes a third step portion 96a that supports the third lens 61a, a fourth step portion 96b that supports the fourth lens 61b, and a fifth step portion 96c that supports the fifth lens 61c.

[0159] The fifth stepped portion 96c is formed by the step difference between the fifth inner circumferential surface 95a, which is located most forward (+Y) in the second cylindrical portion 95, and the sixth inner circumferential surface 95b, which is located more rearward (-Y) than the fifth inner circumferential surface 95a and has a smaller inner diameter than the fifth inner circumferential surface 95a. The fifth lens 61c is supported by the lens support portion 96 via the fifth stepped portion 96c. The fifth lens 61c can be fixed to the fifth stepped portion 96c by means of a mating fit or by means of an adhesive (not shown).

[0160] Fourth step portion 96b is formed by the step difference between seventh inner circumferential surface 95c, which is located closer to the rear side -Y than sixth inner circumferential surface 95b and has a smaller inner diameter than sixth inner circumferential surface 95b, and eighth inner circumferential surface 95d, which is located closer to the rear side -Y than seventh inner circumferential surface 95c and has a smaller inner diameter than seventh inner circumferential surface 95c. In the present embodiment, ninth inner circumferential surface 95e, which connects sixth inner circumferential surface 95b and seventh inner circumferential surface 95c, is a tapered surface whose inner diameter narrows as it moves toward rear side -Y.

[0161] The fourth lens 61b is supported by the lens support portion 96 via the fourth step portion 96b. The fourth lens 61b may be fitted and fixed to the fourth step portion 96b, or may be fixed via an adhesive (not shown).

[0162] The third step portion 96a is constituted by a step difference between a tenth inner peripheral surface 95f on the -Y rearward side from the eighth inner peripheral surface 95d and having a smaller inner diameter than the eighth inner peripheral surface 95d, and an eleventh inner peripheral surface 95g on the -Y rearward side from the tenth inner peripheral surface 95f and having a smaller inner diameter than the tenth inner peripheral surface 95f. In the case of the present embodiment, the eighth inner peripheral surface 95d becomes a tapered surface in which the inner diameter is gradually narrowed toward the -Y rearward side.

[0163] The third lens 61a is supported by the lens support portion 96 via the third step portion 96a. The third lens 61a can be fixedly fitted to the third step portion 96a, or can be fixed via an adhesive not shown.

[0164] In the present embodiment, the outer diameters of the respective lenses constituting the condensing optical system 60 and the pickup optical system 61 are each made smaller as they approach the wavelength conversion unit 30.

[0165] Thus, in the optical casing 62 of the present embodiment, a reduced diameter portion 69 is provided at positions corresponding to the second lens 60b of the condensing optical system 60 and the third lens 61a of the pickup optical system 61. The reduced diameter portion 69 is a portion in which the outer diameter is relatively thin in the optical casing 62.

[0166] In the present embodiment, the wavelength conversion unit 30 is disposed at the reduced diameter portion 69 of the optical casing 62. Since the wavelength conversion unit 30 is mounted to the optical casing 62 from the radially outer side, by disposing the wavelength conversion unit 30 at the reduced diameter portion 69, it is possible to suppress the increase in the radial dimension of the light source device 2.

[0167] As shown in Figs. 7 and 8, the mounting portion 80 is a portion for mounting the wavelength conversion unit 30 with respect to the optical casing 62. In the present embodiment, the wavelength conversion unit 30 including the wavelength conversion wheel 31 is capable of being mounted to the optical casing 62 from a plurality of directions with respect to the optical axis AX3 of the condensing optical system 60 by using the mounting portion 80. Figure 8A Figure 8B As shown in Figs. 7 and 8, the mounting portion 80 is a portion for mounting the wavelength conversion unit 30 with respect to the optical casing 62. In the present embodiment, the wavelength conversion unit 30 including the wavelength conversion wheel 31 is capable of being mounted to the optical casing 62 from a plurality of directions with respect to the optical axis AX3 of the condensing optical system 60 by using the mounting portion 80.

[0168] The mounting portion 80 has a first mounting structure 81, a second mounting structure 82, and a mounting plate 83 along the YZ plane. The mounting plate 83 connects the first cylindrical portion 90 and the second cylindrical portion 95.

[0169] As shown in Figs. 7 and 8, the mounting plate 83 includes a first mounting surface 83a which, as viewed from a position on the +Y side, is along the optical axis AX3 of the condensing optical system 60 and faces the left side -X, a second mounting surface 83b which, as viewed from a position on the +Y side, is along the optical axis AX3 of the condensing optical system 60 and faces the right side +X opposite the first mounting surface 83a, and a through-hole 84. Figure 7

[0170] ​​The mounting plate 83 is located on the optical axis AX3 of the condensing optical system 60.

[0171] In the present embodiment, the mounting plate 83 being located on the optical axis AX3 of the condensing optical system 60 means a state in which the optical axis AX3 overlaps the first mounting surface 83a or the second mounting surface 83b, or a state in which the optical axis AX3 is located between the first mounting surface 83a and the second mounting surface 83b.

[0172] In the present embodiment, the optical axis AX3 of the mounting plate 83 is located in the middle of the first mounting surface 83a and the second mounting surface 83b. That is, in the mounting plate 83 of the present embodiment, the distance from the optical axis AX3 to the first mounting surface 83a is equal to the distance from the optical axis AX3 to the second mounting surface 83b.

[0173] The through-hole 84 penetrates the mounting plate 83 in the plate thickness direction. The planar shape of the through-hole 84 is rectangular. When the wavelength conversion unit 30 is mounted to the mounting portion 80, a portion of the wavelength conversion wheel 31 protrudes from one side to the other side of the mounting plate 83 through the through-hole 84.

[0174] The first mounting structure 81 is capable of mounting the wavelength conversion unit 30 to the first mounting surface 83a. As shown in FIG. 6, in the light source device 2 of the present embodiment, the wavelength conversion unit 30 is mounted on the left side -X of the optical housing 62 via the first mounting structure 81 as viewed from the +Y side. In the present embodiment, the wavelength conversion unit 30 is disposed between the heat dissipation portion 51 and the optical unit 40. Figure 3 As shown in FIG. 6, the first mounting structure 81 is provided to the first mounting surface 83a. The first mounting structure 81 has a plurality of threaded fastening portions 81a and a pair of seats 81b that protrude with respect to the first mounting surface 83a. In the present embodiment, the threaded fastening portions 81a are provided in four. As shown in FIG. 7, a screw member 24 for mounting the wavelength conversion unit 30 is fastened to each threaded fastening portion 81a. The pair of seats 81b are disposed separately in the front-rear direction Y. As shown in FIG. 8, each seat 81b is a base having a trapezoidal planar shape as viewed in the direction along the optical axis AX3, and functions as a base on which the wavelength conversion unit 30 is disposed. Each seat 81b has an outer shape that corresponds to the wheel opening end surface 32a of the wheel housing 32.

[0175] Figure 8A As shown in FIG. 8, each seat 81b is a base having a trapezoidal planar shape as viewed in the direction along the optical axis AX3, and functions as a base on which the wavelength conversion unit 30 is disposed. Each seat 81b has an outer shape that corresponds to the wheel opening end surface 32a of the wheel housing 32. Figure 3 Figure 9 As shown in FIG. 8, each seat 81b is a base having a trapezoidal planar shape as viewed in the direction along the optical axis AX3, and functions as a base on which the wavelength conversion unit 30 is disposed. Each seat 81b has an outer shape that corresponds to the wheel opening end surface 32a of the wheel housing 32.

[0176] ​​In the case of the present embodiment, the width in the front-rear direction Y of the seating 81b on the rear side -Y is larger than the width in the front-rear direction Y of the seating 81b on the front side +Y. This is due to the difference in the width abutting against the wavelength conversion unit 30. In addition, depending on the shape on the wavelength conversion unit 30 side, the width of each seating 81b can be made the same, or the width on the front side +Y can be made larger than the width on the rear side -Y.

[0177] The optical case 62 of the present embodiment has a second opening portion, i.e., a left side opening portion 87, provided on the first mounting surface 83a side of the mounting portion 80. The left side opening portion 87 is an opening defined by the boundary between the space sandwiched by the pair of seatings 81b and the outside of the space.

[0178] As shown in Figs. 1 and 2, the wavelength conversion unit 30 is mounted to the optical case 62 of the optical unit 40. Figure 3 and Figure 5 As shown in Figs. 1 and 2, the wavelength conversion unit 30 is mounted to the optical case 62 of the optical unit 40. Figure 8A As shown in Figs. 1 and 2, the wavelength conversion unit 30 is mounted to the optical case 62 of the optical unit 40.

[0179] The wavelength conversion unit 30, in a state of being mounted to the mounting portion 80 of the optical case 62 of the optical unit 40, has the wavelength conversion element 312, which is a part of the wavelength conversion wheel 31, positioned on the optical path between the condensing optical system 60 and the pickup optical system 61.

[0180] That is, in the present embodiment, the optical unit 40 and the wavelength conversion unit 30 have a part of the wavelength conversion wheel 31, i.e., the wavelength conversion element 312, exposed via the wheel opening portion 33 of the wheel case 32, arranged on the optical path between the condensing optical system 60 and the pickup optical system 61 via the left side opening portion 87 of the optical case 62.

[0181] In the case of the present embodiment, as shown in Figs. 1 and 2, the wavelength conversion element 312, which is a part of the wavelength conversion wheel 31, protrudes to a position further outward than the wheel opening end surface 32a of the wheel case 32 via the wheel opening portion 33. Therefore, when the wavelength conversion unit 30 is mounted to the optical case 62, the wavelength conversion element 312 protruding from the wheel opening end surface 32a can interfere with the mounting plate 83. Figure 5 and Figure 6A In the case of the present embodiment, as shown in Figs. 1 and 2, the wavelength conversion element 312, which is a part of the wavelength conversion wheel 31, protrudes to a position further outward than the wheel opening end surface 32a of the wheel case 32 via the wheel opening portion 33. Therefore, when the wavelength conversion unit 30 is mounted to the optical case 62, the wavelength conversion element 312 protruding from the wheel opening end surface 32a can interfere with the mounting plate 83.

[0182] In the case of the present embodiment, as shown in Figs. 1 and 2, the wavelength conversion element 312, which is a part of the wavelength conversion wheel 31, protrudes to a position further outward than the wheel opening end surface 32a of the wheel case 32 via the wheel opening portion 33. Therefore, when the wavelength conversion unit 30 is mounted to the optical case 62, the wavelength conversion element 312 protruding from the wheel opening end surface 32a can interfere with the mounting plate 83. Figure 5 and Figure 10As shown, the mounting portion 80 of the present embodiment has a through-hole 84 provided at a position corresponding to the wavelength conversion element 312 protruding from the wheel opening end surface 32a, and the wavelength conversion element 312 protruding from the wheel opening end surface 32a is positioned on the opposite side of the mounting plate 83 via the through-hole 84. In this way, the wavelength conversion element 312 is disposed on the optical axis AX3 of the condensing optical system 60, and thus the excitation light B can be efficiently incident on the wavelength conversion element 312 via the condensing optical system 60.

[0183] In addition, in the present embodiment, the optical axis of the pickup optical system 61 coincides with the optical axis AX3 of the condensing optical system 60, and thus the illumination light WL emitted from the wavelength conversion element 312 can be efficiently introduced into the pickup optical system 61. Therefore, the light utilization efficiency of the illumination light WL can be improved.

[0184] In the present embodiment, as shown in FIG. 6, the wavelength conversion unit 30 is fixed to the first mounting structure 81 of the optical housing 62 by the screw member 24. Figure 3 As shown, the first sealing member 55 is pressed between the wheel opening end surface 32a of the wheel housing 32 and the seating 81b and the first mounting surface 83a of the first mounting structure 81, and the gap between the left side opening portion 87 of the optical housing 62 and the wheel opening portion 33 of the wheel housing 32 is well plugged by the first sealing member 55.

[0185] As shown, the first sealing member 55 is pressed between the wheel opening end surface 32a of the wheel housing 32 and the seating 81b and the first mounting surface 83a of the first mounting structure 81, and the gap between the left side opening portion 87 of the optical housing 62 and the wheel opening portion 33 of the wheel housing 32 is well plugged by the first sealing member 55. Figure 9 In this way, the optical unit 40 and the wavelength conversion unit 30 are fixed in a state in which the left side opening portion 87 of the optical housing 62 and the wheel opening portion 33 of the wheel housing 32 are sealed.

[0186] In addition, the second mounting structure 82 can mount the wavelength conversion unit 30 to the second mounting surface 83b. As shown, the second mounting structure 82 has a plurality of threaded fastening portions 82a and a pair of seatings 82b provided to the second mounting surface 83b. In the present embodiment, the threaded fastening portions 82a are provided in four.

[0187] Figure 8B The second mounting structure 82 has the same structure as the first mounting structure 81. Therefore, the optical housing 62 can mount the wavelength conversion unit 30 to the second mounting structure 82 by changing the mounting direction of the wavelength conversion unit 30.

[0188] In addition, in the present embodiment, as described above, the wavelength conversion unit 30 is mounted to the optical housing 62 using the first mounting structure 81, and thus the second mounting structure 82 is not used for the mounting of the wavelength conversion unit 30.

[0189] In addition, in the present embodiment, as described above, the wavelength conversion unit 30 is mounted to the optical housing 62 using the first mounting structure 81, and thus the second mounting structure 82 is not used for the mounting of the wavelength conversion unit 30.

[0190] ​The optical case 62 of the present embodiment has a third opening portion, i.e., a right side opening portion 88, provided on the second mounting surface 83b side of the mounting portion 80. The right side opening portion 88 is an opening defined by a boundary between a space sandwiched by the pair of seats 82b and the outside of the space. The right side opening portion 88 opposes the left side opening portion 87 with the mounting plate 83 of the mounting portion 80 interposed therebetween.

[0191] Here, the condensing optical system 60 and the pickup optical system 61, into which the excitation light B is incident, generate heat. In the light source device 2 of the present embodiment, as shown in FIG. 6, a cover 53 that is thermally connected to the second heat conducting portion 52b of the second cooling portion 50B is mounted to the second mounting structure 82. Thus, by releasing the heat received from the optical case 62, the cooling performance of the condensing optical system 60 and the pickup optical system 61 is improved. Figure 2

[0192] As shown in FIG. 7, the cover 53 includes a cover main portion 53a and a mounting portion 53b. The cover main portion 53a of the cover 53 has an outer shape corresponding to each of the seats 82b of the second mounting structure 82 and each of the seats 81b having the same shape as the seats 82b. Figure 3

[0193] In the case where the cover 53 is mounted to the optical case 62, the mounting portion 53b of the cover 53 is fixed to each of the threaded fastening portions 82a of the second mounting structure 82 by the screw member 24. At this time, as shown in FIG. 8, the cover main portion 53a of the cover 53 abuts against each of the seats 82b and the mounting plate 83 of the second mounting structure 82 to close the right side opening portion 88. Figure 8B

[0194] In the present embodiment, as shown in FIG. 9, the second sealing member 56 is disposed between the cover 53 and the optical case 62, and the cover 53 is fixed to the second mounting structure 82 of the optical case 62 by the screw member 24. Thus, the gap between the right side opening portion 88 of the optical case 62 and the cover main portion 53a of the cover 53 is well plugged by the second sealing member 56. Therefore, as shown in FIG. 10, the cover 53 is fixed to the optical case 62 in a state where the cover 53 covers the right side opening portion 88 of the optical case 62 in a sealed state. Figure 3 Figure 8B

[0195] As described above, in the light source device 2 of the present embodiment, the light source unit 20 and the optical unit 40 are fixed in a sealed state, the optical unit 40 and the wavelength conversion unit 30 cause a portion of the wavelength conversion wheel 31 exposed through the wheel opening portion 33 of the wheel case 32 to be disposed on an optical path between the condensing optical system 60 and the pickup optical system 61 through the left side opening portion 87 of the optical case 62, and the left side opening portion 87 of the optical case 62 and the wheel opening portion 33 of the wheel case 32 are fixed in a sealed state. ​​​​​

[0196] According to the light source device 2 of the present embodiment, a light source device of a sealed configuration in which the wavelength conversion wheel 31 is arranged on the optical path between the condensing optical system 60 and the pickup optical system 61, and the three units of the light source unit 20, the wavelength conversion unit 30, and the optical unit 40 are fixed in a sealed state can be provided. Thus, the intrusion of dust into the inside of the light source device 2 is suppressed, and thus the generation of adverse conditions such as deterioration and heat generation of components due to the attachment of dust to the lenses and the wavelength conversion wheel 31 can be suppressed. In addition, since the light source device 2 is composed of three units, a light source device 2 with excellent assembly properties can be provided.

[0197] In the present embodiment, the wavelength conversion unit 30 is arranged at the reduced diameter portion 69 of the optical housing 62, which is thinner in the outer diameter than other portions. Thus, the amount of protrusion of the wavelength conversion unit 30 from the optical housing 62 can be suppressed, and the increase in the size of the light source device 2 can be suppressed.

[0198] In the present embodiment, the optical housing 62 of the optical unit 40 and the base member 23 of the light source unit 20 are fixed in a sealed state.

[0199] According to this configuration, since the mounting substrate 22 on which the light emitting element 21 is mounted in the light source unit 20 is fixed to the base member 23, rather than the optical housing 62, the sealed state can be easily achieved.

[0200] In the present embodiment, the prism member 63 can be used to change the optical path of the excitation light B2 emitted from the second light emitting element 212, and to reduce the beam width of the excitation light B incident on the condensing optical system 60. Thus, the increase in the size of the condensing optical system 60 on which the excitation light B is incident can be suppressed, and bright fluorescence YL can be generated by increasing the light quantity of the excitation light B.

[0201] In the present embodiment, in the first cooling portion 50A that cools the optical unit 40, the heat of the base member 23 is conducted to the first heat dissipation portion 51a via the first heat conductive portion 52a. According to this configuration, the degree of freedom of the arrangement of the first heat dissipation portion 51a is increased by changing the winding of the first heat conductive portion 52a. Thus, a light source device 2 that is easy to change the layout can be provided.

[0202] In the present embodiment, the wheel housing 32 of the wavelength conversion unit 30 is composed of a first housing 321 and a second housing 322, and the wheel opening portion 33 of the wheel housing 32 is composed of the first housing 321 and the second housing 322.

[0203] According to this configuration, the wheel housing 32 having the wheel opening portion 33 can be composed of two housings, and thus the assembly properties of the wavelength conversion unit 30 can be improved.

[0204] In this embodiment, the optical housing 62 is integrally formed with a first component 85 that holds the focusing optical system 60 and a second component 86 that holds the pickup optical system 61, thereby reducing the number of components. Furthermore, when the optical housing 62 is composed of multiple components, adjustments are required based on the tolerances of each component. However, in this embodiment, by forming the optical housing 62 from a single component, such adjustments are not required, thereby improving assemblability.

[0205] In the present embodiment, the optical unit 40 further includes a cover 53 that covers the right opening 88 facing the left opening 87 of the optical housing 62 in a sealed state.

[0206] This configuration allows the wavelength conversion unit 30 to be mounted also in the right opening 88 of the optical housing 62. Therefore, the wavelength conversion unit 30 can be mounted on the optical housing 62 from both sides in the left-right direction X, thereby increasing the flexibility of the layout of the wavelength conversion unit 30.

[0207] Furthermore, by closing the opening portion not used for mounting the wavelength conversion unit 30 with the cover 53 , it is possible to maintain a sealed state within the light source device 2 .

[0208] In the case of this embodiment, if Figure 2 As shown, in the second cooling portion 50B, the cover 53 can conduct heat received from the wavelength conversion unit 30, the focusing optical system 60, the pickup optical system 61, or the light source unit 20 via the optical housing 62 to the second heat dissipation portion 51b via the second heat conduction portion 52b. This simplifies the structure of the light source device 2 while improving cooling performance.

[0209] In the light source device 2 of the present embodiment, the optical unit 40 includes the mounting portion 80 for mounting the wavelength conversion unit 30 so that the wavelength conversion wheel 31 can be arranged from two directions with respect to the optical axis AX3 of the condensing optical system 60 .

[0210] According to the light source device 2 of this embodiment, the wavelength conversion wheel 31 can be arranged from two directions relative to the optical housing 62 of the optical unit 40, thereby increasing the degree of freedom in the layout of the light source device 2. Therefore, a light source device 2 is provided that can easily change the layout according to the specifications.

[0211] In the case of this embodiment, the mounting portion 80 has a mounting plate 83, which includes a first mounting surface 83a along the optical axis AX3 of the focusing optical system 60 and a second mounting surface 83b opposite to the first mounting surface 83a, and the wavelength conversion unit 30 is mounted on one of the first mounting surface 83a and the second mounting surface 83b.

[0212] According to this structure, the configuration in which the wavelength conversion unit 30 is symmetrically arranged with respect to the optical axis AX3 can be achieved by the mounting plate 83.

[0213] In the case of the present embodiment, the mounting plate 83 is located on the optical axis AX3 of the condensing optical system 60.

[0214] According to this structure, the distance from the wavelength conversion unit 30 mounted on the first mounting surface 83a to the optical axis AX3 is the same as the distance from the wavelength conversion unit 30 mounted on the second mounting surface 83b to the optical axis AX3. Therefore, the alignment of the wavelength conversion unit 30 with the optical axis AX3 becomes easy, and the assembly property is improved.

[0215] In the case of the present embodiment, the mounting portion 80 has a first mounting structure 81 capable of mounting the wavelength conversion unit 30 on the first mounting surface 83a and a second mounting structure 82 capable of mounting the wavelength conversion unit 30 on the second mounting surface 83b, and has the same structure as the first mounting structure 81.

[0216] According to this structure, the wavelength conversion unit 30 of the same configuration can be mounted on both surfaces of the mounting plate 83. Therefore, a light source device that makes the wavelength conversion unit 30 common regardless of the mounting direction, thereby being able to suppress the cost and being able to easily make a layout change can be provided.

[0217] In the case of the present embodiment, the wavelength conversion wheel 31 emits yellow fluorescent light YL obtained by wavelength-converting excitation light B from the back surface 312a, and emits the yellow fluorescent light YL from the front surface 312b. Further, the wavelength conversion unit 30 has a state in which a part of the wavelength conversion wheel 31 is located on the optical path between the condensing optical system 60 and the pickup optical system 61 in the state in which the mounting portion 80 is mounted on the optical unit 40.

[0218] According to this structure, the degree of freedom of the layout of the light source device 2 can be improved with respect to the wavelength conversion wheel 31 of the transmission type.

[0219] In the case of the present embodiment, the cooling unit 50 includes a heat dissipation portion 51 arranged side by side with the optical unit 40 and a heat conduction portion 52 that conducts heat received by the base member 23 of the light source unit 20 to the heat dissipation portion 51.

[0220] According to this structure, the light emitting element 21 of the light source unit 20 can be efficiently cooled.

[0221] In this embodiment, the wavelength conversion unit 30 is disposed between the heat sink 51 and the optical unit 40. Therefore, as viewed from the +Y side, space can be secured on the right side +X, which is the opposite side of the wavelength conversion unit 30 relative to the optical unit 40. Therefore, for example, by arranging projector components in the space +X on the right side of the optical unit 40, the device structure of the projector 1 can be miniaturized.

[0222] The light source device 2 of this embodiment includes a prism member 63 that changes the optical path of the excitation light B2 from the second light-emitting element 212 so as to approximate the excitation light B1 from the first light-emitting element 211, and directs the light to the first lens 60a of the converging optical system 60. The optical housing 62 includes a prism support portion 74 that supports the prism member 63 and a lens support portion 91 that supports the converging optical system 60. The holding surface 71 of the optical housing 62 is fixed to the base member 23.

[0223] According to the light source device 2 of this embodiment, it is composed of three units, namely a light source unit 20, a wavelength conversion unit 30 and an optical unit 40. The prism component 63 that changes the optical path of the excitation light B2 from the second light-emitting element 212 and is incident on the focusing optical system 60 is arranged together with the focusing optical system 60 in the optical housing 62, thereby enabling the device structure to be miniaturized and generating bright illumination light WL.

[0224] In the case of this embodiment, the second reflection surface 63b of the prism component 63 is located between the first lens 60a and the first mounting substrate 221 in the front-to-back direction Y along the optical axis AX3 of the focusing optical system 60, thereby suppressing the enlargement of the light source device 2 in the arrangement direction of the first mounting substrate 221 and the second mounting substrate 222, that is, the left-right direction X.

[0225] In the case of this embodiment, the base member 23 has a recessed portion 23 b , and the first mounting substrate 221 and the second mounting substrate 222 are provided in the recessed portion 23 b .

[0226] According to this configuration, when the holding surface 71 of the optical housing 62 and the base member 23 of the light source unit 20 are fixed to each other, a space for accommodating the light emitting element 21 can be ensured in the recessed portion 23 b.

[0227] In the case of this embodiment, in the left-right direction X that intersects the optical axis AX3 of the focusing optical system 60, when observed from the position on the +Y side, the wavelength conversion unit 30 is arranged at the left side -X of the left-right direction X relative to the optical housing 62, and the prism component 63 is arranged in the optical housing 62 at the right side +X of the left-right direction X relative to the optical axis AX3.

[0228] According to this structure, a space can be ensured on the right side +X opposite to the wavelength conversion unit 30 with respect to the optical unit 40. Therefore, for example, by disposing the projector constituent components in the space on the right side +X of the optical unit 40, the device structure of the projector 1 can be downsized.

[0229] In the case of the present embodiment, the wheel housing 32 is provided with a plurality of fins 130 at positions in the surface of the second housing 322 on the side facing the light source unit 20, which do not overlap with the optical housing 62 in the front-rear direction Y along the optical axis AX3.

[0230] According to this structure, the space of the surface of the second housing 322, which does not overlap with the optical housing 62, can be effectively utilized, and the heat dissipation property of the wheel housing 32 can be improved.

[0231] The projector 1 of the present embodiment has the above-described light source device 2, an image forming device 3 that forms light output from the light source device 2 into image light, and a projection optical device 6 that projects the image light output from the image forming device 3.

[0232] According to the projector 1 of the present embodiment, since the light source device 2 that suppresses the intrusion of dust is provided, a projector with high reliability by suppressing the malfunction of the light source device 2 caused by dust can be provided. In addition, since the dust suction filter for suppressing the intrusion of dust into the light source device 2 can be omitted, the device structure can be simplified.

[0233] In addition, according to the present embodiment, since the light source device 2 that downsizes the device structure and generates bright illumination light WL is provided, a projector that is small and displays a bright image can be provided.

[0234] In addition, according to the present embodiment, since the light source device 2 that improves the degree of freedom of layout is provided, a projector with high degree of freedom of layout of internal structure can be provided. Therefore, a projector with high added value in which layout change corresponding to the specifications can be easily performed is provided.

[0235] (Second Embodiment)

[0236] Next, the light source device of the second embodiment will be described.

[0237] The mounting direction of the wavelength conversion unit 30 of the light source device of the present embodiment with respect to the optical unit 40 is different from that of the first embodiment. In addition, the same reference numerals are attached to the structures and components common to the first embodiment, and detailed description will be omitted.

[0238] Figure 11 is a perspective view showing the schematic structure of the light source device 2A of the present embodiment.

[0239] AsFigure 11 As shown, in the light source device 2A of the present embodiment, from a position of the +Y side, the wavelength conversion unit 30 is installed on the right side +X of the optical unit 40.

[0240] In the present embodiment, in the case where the wavelength conversion unit 30 is installed on the right side +X of the optical housing 62, that is, on the side opposite to the cooling unit 50 with respect to the condensing optical system 60, the mounting portion 126 of the wavelength conversion unit 30 and the screw-fastening portion 82a of the second mounting structure 82 are fixed by the screw member 24. The second mounting structure 82 has the same structure as the first mounting structure 81, and thus, by rotating the wavelength conversion unit 30 by 180° around the optical axis AX3, it can be installed on the second mounting structure 82.

[0241] In the present embodiment, as shown, Figure 3 the wavelength conversion unit 30 and the prism member 63 are disposed on the right side +X of the left-right direction X intersecting the optical axis AX3 of the first lens 60a of the condensing optical system 60 with respect to the optical housing 62. That is, the wavelength conversion unit 30 and the prism member 63 are located on the same right side +X with respect to the optical axis AX3. In addition, a part of the wavelength conversion unit 30 overlaps the prism member 63 in the front-rear direction Y along the optical axis AX3.

[0242] In the case of the present embodiment, the wavelength conversion unit 30 is installed on the optical housing 62 using the second mounting structure 82, and thus the first mounting structure 81 is not used for the installation of the wavelength conversion unit 30.

[0243] In the light source device 2A of the present embodiment, from a position of the +Y side, the cap 53 thermally connected to the second heat-conducting portion 52b of the second cooling portion 50B is installed on the left side -X of the optical unit 40 using the first mounting structure 81.

[0244] In the present embodiment, in the case where the cap 53 is installed on the left side -X of the optical housing 62, the mounting portion 53b of the cap 53 and the screw-fastening portion 81a of the first mounting structure 81 are fixed by the screw member 24.

[0245] Thus, in the light source device 2A of the present embodiment, from a position of the +Y side, the wavelength conversion unit 30 is disposed on the right side +X of the left-right direction X where the outer shape of the optical housing 62 protrudes more with respect to the optical axis AX3.

[0246] According to the light source device 2A of the present embodiment, when the wavelength conversion unit 30 is attached to the optical housing 62, the width of the wavelength conversion unit 30 protruding in the left-right direction X from the end surface of the light source fixing portion 70 of the optical housing 62 can be suppressed to be smaller than that of the light source device 2 of the first embodiment. Thus, according to the light source device 2A of the present embodiment, by further suppressing the size in the left-right direction X, the downsizing of the device structure can be achieved.

[0247] In addition, in the present embodiment, the wavelength conversion unit 30 is disposed on the right side +X opposite to the heat dissipation portion 51 with respect to the optical unit 40. In this case, a space is generated between the light source unit 20 and the heat dissipation portion 51 compared to the structure in which the wavelength conversion unit 30 is disposed on the same side as the heat dissipation portion 51 with respect to the optical unit 40 as in the first embodiment. Thus, it is preferable to effectively use the remaining space.

[0248] Figure 12 is a plan view showing the structure of the light source device of a modification example in which the remaining space is effectively used. In addition, in Figure 12 , the illustration of the heat conduction portion connected to the cover 53 is omitted for easy observation of the drawing.

[0249] As Figure 12 indicated, the first heat dissipation portion 151a and the second heat dissipation portion 151b in the heat dissipation portion 151 each have an extension portion 150a, 150b extending to a portion overlapping the remaining space SP. According to the heat dissipation portion 151, the heat dissipation performance is improved by enlarging the area of the heat dissipation portion, and the downsizing of the device structure can be suppressed by using the remaining space SP.

[0250] (Third Embodiment)

[0251] Next, the light source device of the third embodiment will be described.

[0252] The structure of the optical unit of the light source device of the present embodiment is different from those of the first and second embodiments. In addition, the same reference numerals are given to the structures and components common to the above embodiments, and detailed description is omitted.

[0253] Figure 13 is a perspective view showing the schematic structure of the light source device 2B of the present embodiment.

[0254] As Figure 13 indicated, the light source device 2B of the present embodiment includes a light source unit 20, an optical unit 140, a wavelength conversion unit 30, and a cooling unit 50.

[0255] Figure 14 is an exploded perspective view showing the structure of the light source device 2B.

[0256] As Figure 14The optical unit 140 in the light source device 2B of the present embodiment has an optical housing 162 having a different shape from that of the above-described embodiments. The optical housing 162 has a mounting portion 180, a first member 85, and a second member 86.

[0257] The optical housing 162 of the present embodiment differs from the optical housing 62 of the first and second embodiments in that the mounting portion 180 is disposed so as to be rotated 90° about the optical axis AX3 of the condensing optical system 60 with respect to the first member 85 and the second member 86. Figure 3 The optical axis AX3 of the condensing optical system 60 illustrated is rotated 90°. In addition, the structure of the optical housing 162 other than the layout of the mounting portion 180 is substantially the same as that of the optical housing 62 of the first and second embodiments, and thus detailed description is omitted.

[0258] In the case of the present embodiment, the wavelength conversion unit 30 is capable of being mounted from a plurality of directions, specifically, from two directions of the up-down direction Z, with respect to the optical axis AX3 by utilizing the mounting portion 180 of the optical housing 162. In the present embodiment, the wavelength conversion unit 30 is disposed on the up-down direction Z intersecting the left-right direction X adjacent to the optical unit 140 and the heat dissipation portion 51 with respect to the optical unit 140.

[0259] Specifically, in the light source device 2B of the present embodiment, as viewed from the position of the +Y side, the wavelength conversion unit 30 is mounted to the lower side -Z of the optical unit 140 via the first sealing member 55 by the screw member 24, and the cover 53 is mounted to the upper side +Z of the optical unit 140 via the second sealing member 56 by the screw member 24.

[0260] Figure 15A and Figure 15B is a side view illustrating the main portion structure of the optical housing 162. Figure 15A is a bottom view of the optical housing 162 viewed from the -Z side, Figure 15B is a top view of the optical housing 162 viewed from the +Z side.

[0261] As Figure 15A and Figure 15B illustrated, in the optical housing 162 of the present embodiment, the mounting portion 180 has the first mounting structure 81, the second mounting structure 82, and a mounting plate 183 along the XY plane. The mounting plate 183 of the present embodiment includes a first mounting surface 183a along the optical axis AX3 of the condensing optical system 60 and facing the lower side -Z, a second mounting surface 183b along the optical axis AX3 of the condensing optical system 60 and facing the upper side +Z opposite to the first mounting surface 183a, and a through-hole 84. The mounting plate 183 is located on the optical axis AX3 of the condensing optical system 60.

[0262] The optical housing 162 is capable of mounting the wavelength conversion unit 30 to the lower side -Z by the first mounting structure 81.

[0263] The optical housing 162 of this embodiment has a lower opening 187 which is a second opening provided on the first mounting surface 183a side of the mounting portion 180. The lower opening 187 is an opening defined by the boundary between the space sandwiched by the pair of pedestals 81b and the outside of the space.

[0264] like Figure 14 As shown, when the wavelength conversion unit 30 is mounted on the lower side -Z of the optical housing 162, the mounting portion 126 of the wavelength conversion unit 30 is aligned with the lower side -Z of the optical housing 162. Figure 15A The screw fastening portion 81a of the first mounting structure 81 shown is fixed by the screw member 24. Figure 15A As shown, the wheel opening end surface 32a of the wheel housing 32 constituting the wheel opening portion 33 abuts against the respective seats 81b of the first mounting structure 81 and the mounting plate 183 so that the wheel opening portion 33 surrounds the lower opening portion 187 in a plan view.

[0265] In this embodiment, when the wavelength conversion unit 30 is mounted on the mounting portion 180 of the optical housing 162 of the optical unit 40, a portion of the wavelength conversion wheel 31 exposed through the wheel opening 33 of the wheel housing 32, i.e., the wavelength conversion element 312, is arranged on the optical path between the focusing optical system 60 and the pickup optical system 61 through the lower opening 187 of the optical housing 162.

[0266] like Figure 14 As shown, the optical unit 40 and the wavelength conversion unit 30 are configured such that the lower opening 187 of the optical housing 162 and the wheel opening 33 of the wheel housing 32 are fixed in a sealed state via the first sealing member 55 .

[0267] The wavelength conversion unit 30 can also be mounted on the upper side +Z of the optical housing 162 using the second mounting structure 82. However, as described above, the wavelength conversion unit 30 is mounted on the lower side -Z of the optical housing 162 using the first mounting structure 81. Therefore, in this embodiment, the second mounting structure 82 is not used to mount the wavelength conversion unit 30.

[0268] The optical housing 162 of this embodiment includes an upper opening 188, a third opening, disposed on the second mounting surface 183b side of the mounting portion 180. Upper opening 188 is defined by the boundary between the space sandwiched between the pair of pedestals 82b and the exterior of that space. Upper opening 188 faces lower opening 187 across the mounting plate 183 of the mounting portion 180.

[0269] like Figure 14As shown, in the case where the cover 53 is attached to the optical housing 162, the attachment portion 53b of the cover 53 and the threaded fastening portion 82a of the second attachment structure 82 are fixed by the screw member 24. At this time, as shown in FIG. 6, the cover main body portion 53a of the cover 53 abuts against each seat 82b of the second attachment structure 82 and the attachment plate 83 in a manner to block the upper side opening portion 188. Figure 15B As shown, the cover main body portion 53a of the cover 53 abuts against each seat 82b of the second attachment structure 82 and the attachment plate 83 in a manner to block the upper side opening portion 188.

[0270] The optical unit 40 and the cover 53 are configured such that the upper side opening portion 188 of the optical housing 162 and the cover 53 are fixed in a sealed state by the second sealing member 56.

[0271] Thus, according to the light source device 2B of the present embodiment, it is possible to provide a light source device of a sealed structure in which the wavelength conversion unit 30 can be attached from two directions in the vertical direction Z with respect to the optical unit 140.

[0272] Furthermore, one embodiment of the present application has been illustrated and described, but the present application is not necessarily limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present application.

[0273] For example, in the first embodiment, the case where the optical housing 62 is integrally formed with the first member 85 and the second member 86 has been exemplified, but the first member 85 and the second member 86 can be formed separately. For example, the optical housing 62 can be configured by joining the first member 85 and the second member 86 formed separately by the attachment plate 83. According to this structure, the first member 85 and the second member 86 are each configured by a separate member, and thus it is easy to assemble the condensing optical system 60 and the pickup optical system 61 into the first member 85 and the second member 86.

[0274] In addition, in the above-described embodiment, the case where the wheel opening portion 33 of the wheel housing 32 is configured by the first housing 321 and the second housing 322 has been exemplified, but the wheel opening portion 33 can be configured by only either one of the first housing 321 and the second housing 322.

[0275] In addition, in the above-described embodiment, the case where the attachment portion 80 of the optical housing 62 is located on the optical axis AX3 of the condensing optical system 60 has been exemplified, but the attachment plate 83 can be arranged offset in either direction in the lateral direction X with respect to the optical axis AX3.

[0276] In addition, each optical housing 62, 162 of the above-described embodiment is configured to be provided with two opening portions in a manner that the wavelength conversion unit 30 can be attached from two directions, and the opening portion in which the wavelength conversion unit 30 is not attached is covered by the cover 53, but only one opening portion in which the wavelength conversion unit 30 is attached can be provided.

[0277] Further, in the light source apparatus 2 of the first embodiment, as viewed from the +Y side, the wavelength conversion unit 30 is arranged on the left side -X in the left-right direction X where the amount of protrusion of the outer shape of the optical housing 62 is small with respect to the optical axis AX3, and thus the second housing 322 of the wheel housing 32 of the wavelength conversion unit 30 is overlapped with the optical housing 62 in the left-right direction X less when the wavelength conversion unit 30 is attached to the optical housing 62.

[0278] That is, the surface area of the second housing 322 exposed from the optical housing 62 increases compared to the case where the wavelength conversion unit 30 is attached to the right side +X of the optical housing 62. Thus, in each of the embodiments, if the wavelength conversion unit is not to be made common, the heat dissipation property of the wheel housing 32 can be further improved by further increasing the size of the heat sink 130 provided on the surface of the second housing 322 exposed from the optical housing 62 also for the wavelength conversion unit 30 attached to the left side -X of the optical housing 62 as in the first embodiment.

[0279] The light source apparatus of the aspect of the present application can also have the following structure.

[0280] The light source apparatus of one aspect of the present application includes: a light source unit including a light emitting element; a wavelength conversion unit including a wavelength conversion wheel that, when excitation light emitted from the light emitting element is incident from a first surface, emits wavelength-converted light obtained by wavelength-converting the excitation light from a second surface opposite to the first surface, and a wheel housing that houses the wavelength conversion wheel and includes a first opening portion that exposes a part of the wavelength conversion wheel; and an optical unit including a condensing optical system including a first lens that condenses the excitation light on the wavelength conversion wheel, a pickup optical system that picks up the wavelength-converted light, and an optical housing that includes a second opening portion that receives a part of the wavelength conversion wheel, and holds the condensing optical system and the pickup optical system in such a manner that the part of the wavelength conversion wheel is positioned on an optical path of the condensing optical system and the pickup optical system, the light source unit and the optical unit are fixed in a sealed state, and with respect to the optical unit and the wavelength conversion unit, the part of the wavelength conversion wheel exposed through the first opening portion of the wheel housing is arranged on the optical path between the condensing optical system and the pickup optical system through the second opening portion of the optical housing, and the second opening portion of the optical housing and the first opening portion of the wheel housing are fixed in a sealed state.

[0281] In the light source device of one embodiment of the present application, the light source unit can further include a mounting substrate on which the light emitting element is mounted and a base member on which the mounting substrate is placed. The optical housing of the optical unit and the base member of the light source unit can be fixed in a sealed state.

[0282] In the light source device of one embodiment of the present application, the light source unit can further include a mounting substrate on which the light emitting element is mounted and a base member on which the mounting substrate is placed. The optical housing of the optical unit and the base member of the light source unit can be fixed in a sealed state.

[0283] In the light source device of one embodiment of the present application, the light source unit can include a plurality of light emitting elements and a plurality of mounting substrates. The plurality of light emitting elements can include a first light emitting element and a second light emitting element. The plurality of mounting substrates can include a first mounting substrate on which the first light emitting element is mounted and a second mounting substrate on which the second light emitting element is mounted. The light path changing member can change a light path of excitation light emitted from the second light emitting element. The excitation light emitted from the first light emitting element can directly enter the first lens of the condensing optical system. The excitation light emitted from the second light emitting element can enter the first lens of the condensing optical system via the light path changing member.

[0284] In the light source device of one embodiment of the present application, the light source device can further include a first cooling unit that cools the light source unit. The first cooling unit can include a first heat dissipation unit and a first heat conduction unit that thermally connects the first heat dissipation unit to the base member. Heat of the base member can be conducted to the first heat dissipation unit via the first heat conduction unit.

[0285] In the light source device of one embodiment of the present application, the wheel housing of the wavelength conversion unit can include a first housing and a second housing that are fixed in a sealed state. The first opening portion of the wheel housing can be formed by at least one of the first housing and the second housing.

[0286] In the light source device of one embodiment of the present application, the optical housing can include a first member that holds the condensing optical system and a second member that holds the pickup optical system. The first member and the second member can be formed of a single member.

[0287] In the light source device of one embodiment of the present application, the optical housing can include a first member that holds the condensing optical system and a second member that holds the pickup optical system. The first member and the second member can be formed of a single member.

[0288] In the light source device of one embodiment of the present application, the optical housing can have a third opening portion in addition to the second opening portion of the optical housing, and the optical unit can have a cover that covers the third opening portion in a sealed state.

[0289] In the light source device of one embodiment of the present application, the light source device can further include a second cooling unit that cools the optical unit, the second cooling unit including a second heat sink and a second heat conduction unit that thermally connects the second heat sink to the cover, and heat received by the cover can be conducted to the second heat sink through the second heat conduction unit.

[0290] The projector of one embodiment of the present application can have the following structure.

[0291] The projector of one embodiment of the present application includes the light source device described above, an image forming unit that forms light output from the light source device into image light, and a projection optical unit that projects the image light output from the image forming unit.

Claims

1. A light source device, characterized in that: The light source device comprises: a light source unit having a light emitting element; a wavelength conversion unit comprising: a wavelength conversion wheel configured to receive excitation light emitted from the light-emitting element from a first surface and to emit wavelength-converted light obtained by wavelength-converting the excitation light from a second surface opposite to the first surface; and a wheel housing for accommodating the wavelength conversion wheel, the wheel housing including a first opening portion exposing a portion of the wavelength conversion wheel; as well as an optical unit comprising: a focusing optical system including a first lens for focusing the excitation light onto the wavelength conversion wheel; and a pickup optical system for picking up the wavelength-converted light; and an optical housing including a second opening portion for receiving a portion of the wavelength conversion wheel, holding the focusing optical system and the pickup optical system in such a manner that a portion of the wavelength conversion wheel is located on an optical path between the focusing optical system and the pickup optical system, The light source unit and the optical unit are fixed in a sealed state. Regarding the optical unit and the wavelength conversion unit, a portion of the wavelength conversion wheel exposed through the first opening of the wheel housing is arranged on an optical path between the focusing optical system and the pickup optical system through the second opening of the optical housing, and the second opening of the optical housing and the first opening of the wheel housing are fixed in a sealed state. The light source unit further comprises: a mounting substrate on which the light emitting element is mounted; and a base member on which the mounting substrate is placed and which receives heat from the light emitting element. The optical housing of the optical unit and the base member of the light source unit are fixed in a sealed state. Each of the light source units includes a plurality of the light emitting elements and a plurality of the mounting substrates. The plurality of light emitting elements include a first light emitting element and a second light emitting element, The plurality of mounting substrates include a first mounting substrate for mounting the first light emitting element and a second mounting substrate for mounting the second light emitting element. The focusing optical system further includes an optical path changing member for changing the optical path of the excitation light emitted from the second light emitting element. The excitation light emitted from the first light emitting element is directly incident on the first lens of the condensing optical system. The excitation light emitted from the second light emitting element is incident on the first lens of the condensing optical system via the optical path changing member.

2. The light source device according to claim 1, wherein The focusing optical system and the pickup optical system each include a plurality of lenses, In the converging optical system, a diameter of a second lens on the wavelength conversion wheel side relative to the first lens is smaller than a diameter of the first lens. In the pickup optical system, the diameter of the third lens on the wavelength conversion wheel side is smaller than the diameter of the fourth lens on the light emitting side of the third lens. The optical housing has a reduced diameter portion having an outer diameter smaller than other portions at a position corresponding to the second lens of the condensing optical system and the third lens of the pickup optical system. The wavelength conversion unit is configured in the diameter-reduced portion.

3. The light source device according to claim 1, wherein The light source device further includes a first cooling unit for cooling the light source unit. The first cooling unit includes a first heat dissipation unit and a first heat conduction unit thermally connecting the first heat dissipation unit and the base component. The heat of the base member is conducted to the first heat dissipation portion via the first heat conduction portion.

4. The light source device according to claim 1 or 2, characterized in that: The wheel housing of the wavelength conversion unit includes a first housing and a second housing fixed to each other in a sealed state. The first opening of the wheel housing is formed by at least one of the first housing and the second housing.

5. The light source device according to claim 1 or 2, characterized in that: The optical housing includes a first component for holding the focusing optical system and a second component for holding the pickup optical system. The first component and the second component are formed from a single component.

6. The light source device according to claim 1 or 2, characterized in that: The optical housing includes a first component for holding the focusing optical system and a second component for holding the pickup optical system. The first component and the second component are formed separately.

7. The light source device according to claim 5, wherein: The optical housing further includes a third opening in addition to the second opening. The optical unit further includes a cover that covers the third opening in a sealed state.

8. The light source device according to claim 7, wherein: The light source device further includes a second cooling unit for cooling the optical unit. The second cooling unit includes a second heat dissipation unit and a second heat conduction unit thermally connecting the second heat dissipation unit and the cover. The heat received by the cover is conducted to the second heat dissipation portion via the second heat conduction portion.

9. A light source device, characterized in that: The light source device comprises: a light source unit having a light emitting element; a wavelength conversion unit comprising: a wavelength conversion wheel configured to receive excitation light emitted from the light-emitting element from a first surface and to emit wavelength-converted light obtained by wavelength-converting the excitation light from a second surface opposite to the first surface; and a wheel housing for accommodating the wavelength conversion wheel, the wheel housing including a first opening portion exposing a portion of the wavelength conversion wheel; as well as an optical unit comprising: a focusing optical system including a first lens for focusing the excitation light onto the wavelength conversion wheel; and a pickup optical system for picking up the wavelength-converted light; and an optical housing including a second opening portion for receiving a portion of the wavelength conversion wheel, holding the focusing optical system and the pickup optical system in such a manner that a portion of the wavelength conversion wheel is located on an optical path between the focusing optical system and the pickup optical system, The light source unit and the optical unit are fixed in a sealed state. Regarding the optical unit and the wavelength conversion unit, a portion of the wavelength conversion wheel exposed through the first opening of the wheel housing is arranged on an optical path between the focusing optical system and the pickup optical system through the second opening of the optical housing, and the second opening of the optical housing and the first opening of the wheel housing are fixed in a sealed state. The optical housing includes a first component for holding the focusing optical system and a second component for holding the pickup optical system. The first component and the second component are formed from a single component, The optical housing further includes a third opening in addition to the second opening. The optical unit further includes a cover that covers the third opening in a sealed state. The light source device further includes a second cooling unit for cooling the optical unit and the wavelength conversion unit. The second cooling unit includes a second heat dissipation unit and a second heat conduction unit thermally connecting the second heat dissipation unit and the cover. The heat received by the cover is conducted to the second heat dissipation portion via the second heat conduction portion.

10. A light source device, characterized in that: The light source device comprises: a light source unit having a light emitting element; a wavelength conversion unit comprising: a wavelength conversion wheel configured to receive excitation light emitted from the light-emitting element from a first surface and to emit wavelength-converted light obtained by wavelength-converting the excitation light from a second surface opposite to the first surface; and a wheel housing for accommodating the wavelength conversion wheel, the wheel housing including a first opening portion exposing a portion of the wavelength conversion wheel; as well as an optical unit comprising: a focusing optical system including a first lens for focusing the excitation light onto the wavelength conversion wheel; and a pickup optical system for picking up the wavelength-converted light; and an optical housing including a second opening portion for receiving a portion of the wavelength conversion wheel, holding the focusing optical system and the pickup optical system in such a manner that a portion of the wavelength conversion wheel is located on an optical path between the focusing optical system and the pickup optical system, The light source unit and the optical unit are fixed in a sealed state. Regarding the optical unit and the wavelength conversion unit, a portion of the wavelength conversion wheel exposed through the first opening of the wheel housing is arranged on an optical path between the focusing optical system and the pickup optical system through the second opening of the optical housing, and the second opening of the optical housing and the first opening of the wheel housing are fixed in a sealed state. The optical housing includes a first component for holding the focusing optical system and a second component for holding the pickup optical system. The first component and the second component are formed separately, The optical housing further includes a third opening in addition to the second opening. The optical unit further includes a cover that covers the third opening in a sealed state. The light source device further includes a second cooling unit for cooling the optical unit and the wavelength conversion unit. The second cooling unit includes a second heat dissipation unit and a second heat conduction unit thermally connecting the second heat dissipation unit and the cover. The heat received by the cover is conducted to the second heat dissipation portion via the second heat conduction portion.

11. A projector, characterized in that: The projector has: The light source device according to any one of claims 1 to 10; An image forming device that forms light output from the light source device into image light; and A projection optical device projects the image light output from the image forming device.

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