Light source device and projection image display device

Abstract

In a light source device for a projection-type image display device, the light source is made replaceable while suppressing the adhesion of foreign matter such as dust to the optical elements of the optical system. [Solution] The light source device 20 includes a first housing 92 that defines a sealed space S2 and has a first transmissive window 96 and a second transmissive window 52; a light source 28 that is located outside the sealed space S2 of the first housing 92 and emits light L0 so that it passes through the first transmissive window 96 and enters the sealed space S2 of the first housing 92; and an output light generation optical system 32 that is housed in the sealed space S2 of the first housing 92, generates a predetermined output light Lw from the light L0 that has passed through the first transmissive window 96, and emits the output light Lw through the second transmissive window 52 to the outside of the sealed space S2 of the first housing 92.

Description

Technical Field

[0001] The present disclosure relates to a light source device and a projection type image display device including the light source device.

Background Art

[0002] Patent Document 1 discloses a projection type image display device in which a light source can be easily replaced.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the case of the projection type image display device described in Patent Document 1, when the light source is removed for replacement, foreign matters such as dust may adhere to the optical elements constituting the optical system that guides the light output from the light source. When foreign matters adhere to the optical elements, the light output deteriorates. For example, luminance unevenness or the like occurs in the projected image light.

[0005] Therefore, an object of the present disclosure is to make the light source replaceable while suppressing the adhesion of foreign matters such as dust to the optical elements of the optical system in the light source device of the projection type image display device.

Means for Solving the Problems

[0006] In order to solve the above problems, according to one aspect of the present disclosure, It defines a first space that is essentially sealed, and is a component that allows light to pass through. a first housing including a first transmission window and a second transmission window; a light source disposed outside the first housing and emitting light so as to enter the first housing through the first transmission window; The first space A second space in which the light source is arranged is defined, and the second housing is attached to the first housing, The aforementioned first enclosure The first space It includes an output light generation optical system housed within, which generates a predetermined output light from light transmitted through the first transmission window and transmits the output light through the second transmission window to the outside of the first housing, The output photogenerating optical system , anti Includes a phosphor wheel device that includes a luminescent substrate. fruit, Light emitted from the light source is directly incident on the space housing the fluorescent lamp wheel. , A light source device is provided. Furthermore, according to different aspects of this disclosure, A first enclosure that defines a first space that is substantially sealed and comprises a first transmissive window and a second transmissive window, which are members that allow light to pass through, A light source is positioned outside the first space of the first housing and emits light so as to pass through the first transparent window and enter the first space of the first housing, A second space in which the light source is arranged is defined, and the second housing is attached to the first housing, The first housing comprises an output light generation optical system housed in the first space of the first housing, which generates a predetermined output light from light transmitted through the first transmission window and transmits the output light through the second transmission window to the outside of the first housing, The output light generation optical system includes a phosphor wheel device including a reflective substrate, The second housing has a smaller housing volume than the first housing. A light source device is provided.

[0007] Furthermore, according to another aspect of this disclosure, The above-mentioned light source device, An image forming module that converts the output light of the light source device into image light, A projection-type image display device is provided, which includes a projection optical system that projects image light from the image forming module. [Effects of the Invention]

[0008] According to this disclosure, in a light source device for a projection-type image display device, the light source can be replaced while suppressing the adhesion of foreign matter to the optical elements of the optical system. [Brief explanation of the drawing]

[0009] [Figure 1] A schematic diagram showing a projection image display device equipped with a light source device according to Embodiment 1 of this disclosure. [Figure 2] A schematic diagram showing a light source device in which the light source module and the output light generation module are separated from each other. [Figure 3]Schematic configuration diagram showing a light source device according to Embodiment 2 of the present disclosure in a state where the light source module and the output light generation module are separated from each other [Figure 4] Schematic configuration diagram showing a light source device according to Embodiment 3 of the present disclosure

Mode for Carrying Out the Invention

[0010] A light source device according to an aspect of the present disclosure includes a first housing that defines a sealed space and includes a first transmission window and a second transmission window, a light source disposed outside the sealed space of the first housing and emitting light so as to enter the sealed space of the first housing through the first transmission window, and an output light generation optical system housed in the sealed space of the first housing, generating predetermined output light from the light that has passed through the first transmission window, and transmitting the output light through the second transmission window to emit it outside the sealed space of the first housing.

[0011] According to such an aspect, in the light source device of a projection type image display device, the light source can be replaced while suppressing the adhesion of foreign substances to the optical elements of the optical system.

[0012] For example, the light source device may further include a second housing that houses the light source. In this case, the second housing is detachably attached to the first housing such that the light source faces the first transmission window.

[0013] For example, the light source may be housed in a sealed space defined by cooperation between the first housing and the second housing in a state where the second housing is attached to the first housing.

[0014] For example, the second housing may define a sealed space that houses the light source.

[0015] For example, the light source may emit blue light as the light, and the output light generation optical system may include a phosphor wheel device that includes a reflective substrate that converts the blue light into yellow light and reflects it. In this case, the output light generation optical system spectrally separates the blue light from the light source into a first blue light and a second blue light, guides the first blue light toward the reflective substrate, and generates white light as the output light by combining the yellow light reflected from the reflective substrate with the second blue light.

[0016] For example, the light source emits blue light as the light, and the light source device may further include a phosphor wheel device which is located outside the first housing and includes a reflective substrate that converts and reflects the blue light into yellow light. In this case, the first housing further includes a third transmissive window facing the reflective substrate. The output light generation optical system also spectrally separates the blue light from the light source into first blue light and second blue light, guides the first blue light to pass through the third transmissive window toward the reflective substrate, and generates white light as the output light by combining the yellow light reflected from the reflective substrate and passed through the third transmissive window with the second blue light.

[0017] Furthermore, another embodiment of the projection image display device of this disclosure includes the above-described light source device, an image forming module that converts the output light of the light source device into image light, and a projection optical system that projects the image light from the image forming module.

[0018] According to this embodiment, in a light source device for a projection-type image display device, the light source can be replaced while suppressing the adhesion of foreign matter to the optical elements of the optical system.

[0019] The embodiments will be described in detail below, with reference to the drawings as appropriate. However, unnecessarily detailed explanations may be omitted. For example, detailed explanations of already well-known matters and redundant explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily verbose and to facilitate understanding for those skilled in the art.

[0020] The attached drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure, and are not intended to limit the subject matter described in the claims.

[0021] (Embodiment 1) Figure 1 is a schematic diagram showing a projection-type image display device equipped with a light source device according to Embodiment 1 of the present disclosure.

[0022] As shown in Figure 1, the projection-type image display device 10 consists of a light source device 20 and a projection device 60 that creates and projects image light.

[0023] In this first embodiment, the light source device 20 comprises a light source module 22 and an output light generation module 24.

[0024] The light source module 22 of the light source device 20 includes a substrate 26, a plurality of laser elements 28 (light sources) provided on the substrate 26, and a collimating lens 30 provided on each laser element 28 that converts the laser light emitted from the laser element 28 into parallel light. In this embodiment 1, the laser elements 28 are semiconductor laser elements that emit blue laser light. For example, 40 to 60 laser elements 28 are arranged in a matrix on the substrate 26. As a result, high-brightness blue laser light L0 is output from the light source module 22 toward the output light generation module 24.

[0025] The output light generation module 24 is a module that generates a predetermined output light that the light source device 20 ultimately outputs from the laser light L0 output by the light source module 22. In this embodiment 1, the output light generation module 24 includes an output light generation optical system 32 for generating white light Lw from the blue laser light L0 output by the light source module 22. The output light generation optical system 32 is configured to generate white light Lw by spectrally splitting the blue laser light L0 from the light source module 22 into a first blue light L1 and a second blue light L2, converting the first blue light L1 into yellow light, and then combining the yellow light and the second blue light L2, as will be described in detail later. To this end, the output light generation optical system 32 includes, as its components, a diffuser plate 34, a quarter-wave plate 36, a dichroic mirror 38, a phosphor wheel device 40, lenses 42, lenses 44, lenses 46, a quarter-wave plate 48, and a mirror 50.

[0026] The diffuser plate 34 is a glass plate having a diffusion surface on one side composed of fine irregularities. The diffuser plate 34 eliminates brightness unevenness in the blue laser light L0 output from the light source module 22.

[0027] The quarter-wave plate 36 is an optical element that generates a phase difference of 1 / 4 wavelength between the two vertically polarized components of the blue laser light L0 emitted from the diffuser plate 34. The quarter-wave plate 36 causes the blue laser light L0 emitted from the diffuser plate 34 to be polarized from a linearly polarized state to an elliptically polarized state.

[0028] The dichroic mirror 38 is an optical element that spectrally separates the blue laser light L0 emitted from the quarter-wave plate 36, and is positioned at an angle of approximately 45 degrees with respect to the emission direction of the blue laser light L0 emitted from the quarter-wave plate 36. The dichroic mirror 38 reflects the S-polarized component (first blue light) L1 of the blue laser light L0 toward the phosphor wheel device 40 and transmits the P-polarized component (second blue light) L2.

[0029] The phosphor wheel device 40 is a device that converts blue light to yellow light and includes a reflective substrate 40a and a motor 40b for rotating the reflective substrate 40a. A yellow phosphor layer 40c is formed on the reflective substrate 40a. Lenses 42 and 44, positioned between the dichroic mirror 38 and the phosphor wheel device 40, focus the S-polarization component L1 of the blue laser light reflected from the dichroic mirror 38 onto the yellow phosphor layer 40c on the reflective substrate 40a. The portion of the yellow phosphor layer 40c that is focused by the light is excited and emits yellow light. This yellow light is parallelized by the lenses 42 and 44 and then transmitted through the dichroic mirror 38.

[0030] Meanwhile, the P-polarized component L2 of the blue laser light that has passed through the dichroic mirror 38 is focused onto the mirror 50 by the lens 46. Before reaching the mirror 50, the P-polarized component L2 of the blue laser light becomes circularly polarized by passing through the quarter-wave plate 48. The P-polarized component L2 of the blue light reflected by the mirror 50 is again transmitted through the quarter-wave plate 48 in the opposite direction and converted to S-polarized light. This S-polarized light is then made parallel by the lens 46 and reflected by the dichroic mirror 38.

[0031] Yellow light from the phosphor wheel device 40 that has passed through the dichroic mirror 38 and blue light L2 from the mirror 50 reflected by the dichroic mirror 38 are combined to generate white light Lw. The white light Lw travels toward the focusing lens 52. The white light Lw is output from the focusing lens 52 toward the projection device 60.

[0032] In this embodiment 1, the projection device 60 includes a lens 62, a rod integrator 64, a lens 66, a lens 68, a mirror 70, a lens 72, a prism 74, an image forming module 76, and a projection optical system 78 in order to generate image light from the white light Lw output by the light source device 20 and project the image light.

[0033] White light Lw emitted from the focusing lens 52 of the light source device 20 enters the projection device 60 via lens 62. The white light Lw emitted from lens 62 passes through the rod integrator 64, lens 66, and lens 68 in sequence and is reflected by mirror 70. The reflected white light Lw is incident on the image forming module 76 via lens 72 and prism 74.

[0034] The image forming module 76 is a module that converts white light Lw into image light. To this end, the image forming module 76 includes a prism assembly 86 consisting of three prisms 80, 82, and 84, and three digital micromirror devices (DMDs) 88R, 88G, and 88B.

[0035] The prism assembly 86 is a so-called TIR (Total Internal Reflection) prism, configured to reflect light of a specific wavelength (specific color) at the interface between prisms 80 and 84. Thus, the prism assembly 86 separates the white light Lw from prism 74 into red light Lr, green light Lg, and blue light Lb. The prism assembly 86 then emits the separated red light Lr, green light Lg, and blue light Lb toward the digital micromirror devices 88R, 88G, and 88B. Furthermore, the prism assembly 86 combines the modulated light (red image light, green image light, and blue image light) reflected from the digital micromirror devices 88R, 88G, and 88B, respectively, and outputs the combined modulated light (full-color image light) toward the projection optical system 78.

[0036] The digital micromirror devices 88R, 88G, and 88B are optical modulation devices equipped with multiple micromirrors that selectively reflect light in multiple directions. Each of the digital micromirror devices 88R, 88G, and 88B modulates the red light Lr, green light Lg, and blue light Lb emitted from the prism assembly 86, and reflects the modulated light (image light) back towards the prism assembly 86.

[0037] The projection optical system 78 is an optical system that includes at least a projection lens and projects full-color image light emitted from the image forming module 76 onto, for example, a screen.

[0038] Up to this point, we have described the configuration of a projection-type image display device according to one embodiment of this disclosure. From here on, we will describe further features of the light source device.

[0039] As shown in Figure 1, in the light source device 20, the output light generation optical system 32, which includes a plurality of laser elements 28 (light sources) and a dichroic mirror 38 that generates white light Lw from the blue laser light L0 emitted by the plurality of laser elements 28, is housed in mutually independent spaces S1 and S2.

[0040] Figure 2 is a schematic diagram showing a light source device in which the light source module and the output light generation module are separated from each other.

[0041] As shown in Figures 1 and 2, in this embodiment 1, the light source module 22 includes a substrate 26, a plurality of laser elements 28, and a housing 90 (second housing) that defines a space S1 for housing a collimating lens 30.

[0042] Furthermore, the output light generation module 24 includes a housing 92 (first housing) that defines a space S2 for housing the output light generation optical system 32, which includes a dichroic mirror 38 and the like.

[0043] The housing 90 of the light source module 22 is detachably attached to the housing 92 of the output light generation module 24. The substrate 26 and collimating lens 30 are supported by the housing 90. In this embodiment 1, the housing 90 also has an opening 90a that communicates with space S1. When the housing 90 is attached to the housing 92 of the output light generation module 24, the opening 90a of the housing 90 is covered by the outer surface of the housing 92. Through the cooperation of the housings 90 and 92 in this way, space S1, which houses the multiple laser elements 28, etc., becomes a substantially sealed space, protecting the multiple laser elements 28, etc. In addition, a sealing ring 94 made of an elastic material such as silicone rubber is placed between the housings 90 and 92 to prevent foreign matter such as dust from entering space S1 through the gap between the housings 90 and 92. Although not shown in the diagram, the outer surface of the housing 90 is also provided with a cooling device such as a heat sink for cooling the laser element 28.

[0044] Housing 90 and housing 92 are positioned relative to each other, for example, via positioning pins and positioning holes. Furthermore, housing 90 and housing 92 are detachably fixed to each other, for example, via fixing screws.

[0045] The housing 92 of the output light generation module 24 defines a substantially sealed space S2 in which the intrusion of foreign matter such as dust is suppressed. Within this sealed space S2 is the output light generation optical system 32, which includes a dichroic mirror 38 that generates white light Lw from the blue laser light L0 output by the light source module 22. Although not shown in the figures, a cooling device such as a heat sink for cooling the phosphor wheel device 40 is provided on the outer surface of the housing 92.

[0046] A transparent window 96 (first transparent window) is provided in the housing 92 so that the blue laser light L0 output from the light source module 22 can enter the space S2. The transparent window 96 is made of, for example, a glass plate. The transparent window 96 is positioned in the part of the housing 92 facing the multiple laser elements 28 when the housing 90 of the light source module 22 is attached to the housing 92 of the output light generation module 24. The transparent window 96 is fitted into a through hole formed in the housing 92. The gap between the transparent window 96 and the housing 92 is sealed with adhesive or the like. By passing through such a transparent window 96, the laser light L0 emitted by the laser elements 28, which are located outside the sealed space S2 of the housing 92, can enter the sealed space S2 of the housing 92.

[0047] White light Lw generated by the output light generation optical system 32 within the space S2 of the housing 92 passes through the condensing lens 52 and exits to the outside of the sealed space S2 of the housing 92. In this embodiment 1, the condensing lens 52 functions as a second transmission window. The condensing lens 52 is fitted into a through hole formed in the housing 92 of the output light generation module 24. The gap between the condensing lens 52 and the housing 92 is sealed with adhesive or the like. By passing through such a condensing lens 52, the output light (white light Lw) generated by the output light generation optical system 32 can proceed to the outside of the sealed space S2 of the housing 92. In addition to the condensing lens 52, a transmission window made from a glass plate, similar to the transmission window 96, may be provided in the housing 92.

[0048] Therefore, the blue laser light L0 emitted from the laser element 28 of the light source module 22 passes through the transmission window 96 and enters the sealed space S2 of the housing 92. The output light generation optical system 32 in that space S2 generates white light Lw from the incoming blue laser light L0, and the generated white light Lw is transmitted through the focusing lens 52 and emitted to the outside of space S2. As a result, the white light Lw is output to the outside of space S2 of the housing 92 as the output light of the light source device 20.

[0049] With this housing structure of the light source device 20, the output light generation optical system 32 (and the multiple optical elements that constitute it), which includes a dichroic mirror 38 that generates white light Lw from blue laser light L0 emitted by multiple laser elements 28, is housed in a sealed space S2 defined by the housing 92. When multiple laser elements 28 are replaced for reasons such as lifespan, the optical elements of the output light generation optical system 32 are not exposed to the outside of the space S2 of the housing 92. In other words, space S2 does not communicate with the space outside the housing 92. As a result, when multiple laser elements 28 are replaced, the adhesion of foreign matter such as dust to the optical elements of the output light generation optical system 32 is suppressed. In this embodiment 1, when it becomes necessary to replace the laser elements 28, the entire light source module 22 is replaced.

[0050] Furthermore, in this embodiment 1, the laser element 28 emits short-wavelength blue laser light L0. Short-wavelength light easily attracts foreign matter such as dust from the air. However, even if the laser element 28 attracts foreign matter such as dust, the collected foreign matter does not adhere to the optical elements of the output light generation optical system 32, which is housed in a sealed space S2.

[0051] Furthermore, in this embodiment 1, the multiple laser elements 28 are located within a sealed space S1 while the blue laser light L0 is being emitted. As a result, even when emitting laser light L0, which has a high dust collection effect, foreign matter such as dust does not adhere to the laser elements 28 or the collimating lens 30 within the space S1.

[0052] This housing structure of the light source device 20 makes it possible to suppress the deterioration of the light output of the light source device 20 due to the adhesion of foreign matter such as dust.

[0053] As described above, according to this embodiment 1, in the light source device of a projection-type image display device, the light source can be replaced while suppressing the adhesion of foreign matter to the optical elements of the optical system.

[0054] (Embodiment 2)

[0055] This second embodiment is an improved version of the first embodiment. Therefore, this second embodiment will be described focusing on the differences. Components of this second embodiment that are substantially the same as those of the first embodiment are denoted by the same reference numerals.

[0056] Figure 3 is a schematic configuration diagram showing a light source device according to Embodiment 2 of this disclosure, in which the light source module and the output light generation module are separated from each other.

[0057] As shown in Figure 3, in this second embodiment, the light source module 122 of the light source device 120 includes a housing 190 that defines a sealed space S1. Multiple laser elements 28 are housed within this sealed space S1. The housing 190 also includes a transmissive window 198 through which laser light emitted from the laser elements 28 passes. When the housing 190 is detachably attached to the housing 92 of the output light generation module 24, the transmissive window 198 of the light source module 122 faces the transmissive window 96 of the output light generation module 24.

[0058] With such a light source device 120, even when the light source module 122 is separated from the output light generation module 24, it is possible to suppress the adhesion of foreign matter such as dust to the laser element 28.

[0059] Similar to Embodiment 1 described above, this second embodiment also allows for the replacement of the light source in the light source device of a projection-type image display device while suppressing the adhesion of foreign matter to the optical elements of the optical system.

[0060] (Embodiment 3) This third embodiment is an improved version of the first embodiment. Therefore, this third embodiment will be described focusing on the differences. Components of this third embodiment that are substantially the same as those of the first embodiment are denoted by the same reference numerals.

[0061] Figure 4 is a schematic diagram showing a light source device according to Embodiment 3 of this disclosure.

[0062] As shown in Figure 4, in the light source device 220, the output light generation optical system 232, which is housed in a sealed space S2 defined by the housing 294 of the output light generation module 224, does not include the phosphor wheel device 40. The phosphor wheel device 40 is located outside the space S2 of the housing 294. Specifically, the light source device 220 includes a light source module 22 and an output light generation module 224, as well as a light conversion module 300 which includes the phosphor wheel device 40. The light conversion module 300 has a housing 302 which defines a space S3 that houses the phosphor wheel device 40. The housing 302 is detachably attached to the housing 294 of the output light generation module 224. When the housing 302 is attached to the housing 294, the space S3 becomes substantially sealed.

[0063] In the output light generation optical system 232, the lens 44 facing the reflective substrate 40a of the phosphor wheel device 40 is fitted into a through hole formed in the housing 294 and functions as a transmissive window (third transmissive window). This lens 44, functioning as a transmissive window, allows the first blue light L1 to travel from space S2 of the housing 292 towards the reflective substrate 40a of the phosphor wheel device 40 housed in space S3 of the housing 302. Also, yellow light from the reflective substrate 40a can travel from space S3 to space S2. In other words, in this embodiment 3, white light Lw is generated by the cooperation of the output light generation optical system 232 housed in space S1 and the phosphor wheel device 40 located outside space S1.

[0064] In this way, by positioning the phosphor wheel device 40 outside the space S2 defined by the housing 294 of the output light generation module 224, the output light generation module 224 no longer has any components that operate on power supply. Therefore, the output light generation module 224 has virtually zero chance of failure under normal use and has a long lifespan. In other words, in the light source device 220 of this embodiment 3, the components that need to be replaced due to lifespan or failure are the light source module 22 and the light conversion module 300.

[0065] In this third embodiment, similar to the first embodiment described above, the light source in the projection-type image display device can be replaced while suppressing the adhesion of foreign matter to the optical elements of the optical system. In addition, the phosphor wheel device can be replaced while suppressing the adhesion of foreign matter to the optical elements of other optical systems.

[0066] Although the present disclosure has been described above with reference to embodiments 1 to 3, the embodiments of this disclosure are not limited to those described above.

[0067] For example, in the first embodiment described above, the light source device 20 includes one light source that emits blue laser light L0. However, the embodiments of this disclosure are not limited to this. For example, the light source device may have a light source that emits red light, a light source that emits green light, and a light source that emits blue light. In this case, at least one first transmissive window is provided in the first housing (housing of the output light generation module) through which light of each color emitted from each light source passes. That is, each color of light may pass through a corresponding first transmissive window, or each color of light may pass through one first transmissive window. In this case, the output light generation optical system, housed in a sealed space defined by the first housing, synthesizes the light of each color to generate white light.

[0068] The first housing may consist of a single component, or it may be a part of a housing (so-called main body) that accommodates all the components of the projection-type image display device. The first housing only needs to be capable of defining a sealed space.

[0069] As described above, the embodiments described in this disclosure have been explained as examples of the technology. For this purpose, drawings and a detailed description are provided. Therefore, among the components described in the drawings and detailed description, there may be not only components that are essential for solving the problem, but also components that are not essential for solving the problem, in order to illustrate the technology described above. For this reason, the mere fact that these non-essential components are described in the drawings and detailed description should not be immediately assumed to be essential.

[0070] Furthermore, since the embodiments described above are for illustrative purposes of the technology described herein, various modifications, substitutions, additions, omissions, etc., can be made within the scope of the claims or equivalents thereof. [Industrial applicability]

[0071] This disclosure is applicable to light source devices in which the light source is replaceable. [Explanation of symbols]

[0072] 20 Light source device 28 Light source (laser element) 32 Output light generation optical system 52. Second transmission window (concentrating lens) 92 First enclosure 96 First transparent window L0 light (laser light) Lw output light (white light) S2 Closed space

Claims

1. A first enclosure that defines a first space that is substantially sealed and comprises a first transmissive window and a second transmissive window, which are members that allow light to pass through, A light source is positioned outside the first space of the first housing and emits light so as to pass through the first transparent window and enter the first space of the first housing, A second space in which the light source is arranged is defined, and the second housing is attached to the first housing, The first housing comprises an output light generation optical system housed in the first space of the first housing, which generates a predetermined output light from light transmitted through the first transmission window and transmits the output light through the second transmission window to the outside of the first housing, The output light generation optical system includes a phosphor wheel device including a reflective substrate, Light emitted from the light source is directly incident on the space housing the fluorescent lamp wheel. Light source device.

2. A first housing comprising a first transparent window and a second transparent window, which are members that transmit light and define a first space that is substantially sealed, A light source is positioned outside the first space of the first housing and emits light so as to pass through the first transparent window and enter the first space of the first housing, A second space in which the light source is arranged is defined, and the second housing is attached to the first housing, The first housing comprises an output light generation optical system housed in the first space of the first housing, which generates a predetermined output light from light transmitted through the first transmission window and transmits the output light through the second transmission window to the outside of the first housing, The output light generation optical system includes a phosphor wheel device including a reflective substrate, The second housing has a smaller housing volume than the first housing. Light source device.

3. The light source device according to claim 1 or 2, wherein the second housing is attached to the first housing such that the light source faces the first transmissive window.

4. The light source device according to claim 1 or 2, wherein the phosphor wheel device includes a phosphor that converts blue light into yellow light.

5. The light source device according to claim 4, wherein the output light generation optical system spectrally separates the blue light from the light source into a first blue light and a second blue light, guides the first blue light toward the reflective substrate, and generates white light as the output light by combining the yellow light reflected from the reflective substrate with the second blue light.

6. The light source device according to claim 1 or 2, wherein the second housing is substantially sealed.

7. The light source device according to claim 1 or 2, wherein the second housing is detachably attached to the first housing.

8. The light source device according to claim 5, wherein the output light generation optical system has a mirror into which the second blue light is incident.

9. The device has a focusing lens positioned at the location where the first blue light is incident, The light source device according to claim 5, wherein the first blue light focused by the focusing lens is incident on the phosphor wheel device.

10. The light source device according to claim 1 or 2, further comprising a first cooling device on the outer surface of the first housing for cooling the phosphor wheel device.

11. The light source device according to claim 1 or 2, further comprising a second cooling device for cooling the light source on the outer surface of the second housing.

12. A light source device according to claim 1 or 2, An image forming module that converts the output light of the light source device into image light, A projection-type image display device comprising: a projection optical system for projecting image light from the image forming module.

13. The image forming module and a third housing having a third transparent window are provided. The projection-type image display device according to claim 12, wherein light emitted from the second transmissive window is incident on the third transmissive window, which is a light-transmitting member.

14. The projection-type image display device according to claim 13, wherein the third housing is located outside the second housing.

15. The light source comprises a light source unit that emits light, It has a collimating lens that converts the light emitted from the light source into parallel light, The light source device according to claim 1 or 2, wherein the collimating lens is a plano-convex lens.

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