JP6813118B2 - Lighting equipment and projector - Google Patents

Description

The present invention relates to a lighting apparatus and a projector.

Conventionally, a light source device, a light modulation device that modulates the light emitted from the light source device to form an image according to image information, and projection optics that magnifies and projects the formed image onto a projected surface such as a screen. A projector equipped with a device is known. As a light source device used in such a projector, white light is emitted by synthesizing laser light in the blue wavelength region and light in the green wavelength region from the red wavelength region generated from a fluorescent substance excited by the laser light. A light source device is known (see, for example, Patent Document 1).
The light source device described in Patent Document 1 includes a housing portion, two light source portions held in the housing portion, and one phosphor unit. Of these, the light source unit has one or more solid light sources, and the phosphor unit receives light from the light source unit to generate and emit white light.
In such a light source device, a heat sink is provided on the rear side of each light source unit.

Japanese Unexamined Patent Publication No. 2014-238485

By the way, while a solid-state light source generates heat when it is lit, its life is shortened if a high temperature state continues, so appropriate cooling is required.
However, in the light source device described in Patent Document 1, the surface on the rear side of the heat sink is relative to the heat sink arranged on the rear side (opposite side to the light emitting side) of the light source portion having one or more solid light sources. When the cooling gas is sent to the light source unit, only a part of the cooling gas flows to the light source unit, and the other cooling gas does not flow to the light source unit and is discharged through the fins. Therefore, there is a problem that the cooling efficiency of the light source unit is not high.

The present invention is intended to solve at least part of the above problems, one object is to provide an efficient lighting device and a projector Ru can cool the light source.

The light source device according to the first aspect of the present invention includes a light source unit that emits light, a heat receiving unit that receives heat generated in the light source unit, and a heat radiating unit that dissipates heat conducted from the heat receiving unit. The heat radiating unit extends along a plane defined by a first direction and a second direction orthogonal to the first direction, and a third direction orthogonal to each of the first direction and the second direction. A plurality of plate-shaped bodies arranged to face each other, a connecting portion located on the second direction side of the plurality of plate-shaped bodies and connected to the heat receiving portion, and the second direction in the heat radiating portion. Having an opening located at a position corresponding to the connection portion on the opposite direction side and a shielding portion located around the opening portion on the side opposite to the second direction in the heat radiating portion. It is a feature.

As such a light source unit, a configuration having a solid light source such as an LD (Laser Diode) or an LED (Light Emitting Diode) or a configuration having a light source lamp such as an ultra-high pressure mercury lamp can be exemplified.
According to the first aspect, when the cooling gas flows to the heat radiating portion along the second direction, the cooling gas is blocked by the shielding portion and introduced into the heat radiating portion through the opening. The cooling gas flows in the second direction between the plurality of plate-shaped bodies, and the opening is located at a position corresponding to the connection portion connected to the heat receiving portion. Therefore, the cooling gas that has flowed in the second direction between the plurality of plate-like bodies flows in the shortest distance to the connecting portion where heat is conducted from the heat receiving portion and becomes high temperature. According to this, the connection portion can be efficiently cooled by the circulation of the cooling gas. Therefore, the cooling gas can be guided to the opening by the shielding portion, whereby the cooling gas can be reliably and effectively circulated through the connection portion, so that the heat receiving portion and the light source portion can be efficiently cooled. Further, since the light source unit is cooled in this way, the life of the light source unit and, by extension, the light source device can be extended.

In the first aspect, it is preferable that the cooling gas flowing inside the heat radiating portion through the opening flows between the plurality of plate-like bodies along the second direction.
According to such a configuration, as described above, the cooling gas that has flowed inside the heat radiating part through the opening flows along the second direction, so that the cooling gas is surely distributed to the connecting part. be able to. Therefore, the heat receiving portion and the light source portion can be reliably and efficiently cooled.

In the first aspect, the shielding portion is at least one of a portion on the surface of the heat radiating portion on the side opposite to the second direction and a portion on the side opposite to the first direction. It is preferably located in.
According to such a configuration, the cooling gas introduced into the heat radiating portion through the opening and cooling the connecting portion flows between the plate-like bodies in the first direction and in the direction opposite to the first direction. The flow path can be lengthened. Therefore, a plurality of plate-like bodies to which heat is conducted from the connection portion can be efficiently cooled.

In the first aspect, the dimension of the opening in the first direction is preferably less than or equal to the dimension of the connection in the first direction.
Here, when the dimension of the opening in the first direction is larger than the dimension of the connection portion in which heat is conducted from the heat receiving portion in the first direction, cooling gas that does not flow to the connection portion is likely to be generated, and the connection portion Cooling efficiency is reduced.
On the other hand, according to the above configuration, almost all of the cooling gas introduced from the opening can be reliably circulated to the connection portion. Therefore, the flow rate of the cooling gas flowing through the connection portion can be increased, and the cooling efficiency of the heat receiving portion and the light source portion can be further improved.

In the first aspect, the heat radiating portion discharges the cooling gas that has flowed inside to the outside at least in either the first direction side or the direction opposite to the first direction with respect to the connecting portion. It is preferable to have a portion.
According to such a configuration, the cooling gas introduced through the opening flows to the connecting portion, passes between the plurality of plate-like bodies, and reaches the first direction side or the first direction of the connecting portion. Is circulated in the opposite direction and discharged from the discharge section. According to this, the cooling gas that has cooled the connection portion can be circulated smoothly to at least one of the first direction side and the side opposite to the first direction. Therefore, since the cooling gas can be reliably circulated between the plate-shaped bodies, it is possible to improve the cooling efficiency of these plate-shaped bodies and, by extension, the cooling efficiency of the heat receiving portion and the light source portion. In addition, the flow velocity of the cooling gas can be increased by allowing the cooling gas to flow smoothly. Therefore, also in this respect, the cooling efficiency of the heat conducted through the connecting portion can be improved, and the cooling efficiency of the heat receiving portion and the light source portion can be improved.

In the first aspect, it is preferable that the discharge portion is located on the same surface as the surface on which the connection portion is located in the heat dissipation portion.
According to such a configuration, for example, when a duct is connected to the discharge portion, it is possible to prevent the size of the light source device and the lighting device including the duct from becoming large in the first direction.

In the first aspect, it is preferable that the discharge portion is located at each of the end face on the first direction side and the end face on the side opposite to the first direction in the heat dissipation portion.
According to such a configuration, the cooling gas can be circulated over the entire surface of each plate-shaped body along the first direction. Therefore, the cooling efficiency of each plate-shaped body can be improved, and by extension, the cooling efficiency of the heat receiving portion and the light source portion can be improved.

The lighting device according to the second aspect of the present invention includes the light source device, a duct in which at least one of a cooling gas circulated in the heat radiating portion and a cooling gas obtained by cooling the heat radiating portion circulates inside, and the duct. It is characterized by including a fan provided and allowing a cooling gas to flow through the heat radiating portion, and a plurality of optical components that act on the light emitted from the light source device.
According to the second aspect, the same effect as that of the light source device according to the first aspect can be obtained. In addition, the fan can reliably circulate the cooling gas to the heat radiating portion.

In the second aspect, it is preferable to include two light source devices and a photosynthetic member that synthesizes light emitted from the two light source devices.
According to such a configuration, the light emitted from the two light source devices and the light synthesized by the photosynthetic member is emitted from the lighting device. As a result, the amount of light emitted can be increased as compared with the lighting device in which one light source device is adopted.

The projector according to the third aspect of the present invention includes the lighting device, a light modulation device that modulates the light emitted from the lighting device, and a projection optical device that projects the light modulated by the light modulation device. It is characterized by being prepared.
According to the third aspect, the same effect as that of the lighting device according to the second aspect can be obtained, so that a projector capable of stably projecting an image can be configured.

The schematic diagram which shows the structure of the projector which concerns on 1st Embodiment of this invention. The schematic diagram which shows the structure of the uniform lighting apparatus in the said 1st Embodiment. A perspective view of the light source device according to the first embodiment as viewed from the light emitting side. A perspective view of the light source device according to the first embodiment as viewed from a side opposite to the light emitting side. A perspective view of the light source device and the light source cooling device according to the first embodiment as viewed from a side opposite to the light emitting side. A perspective view of the light source device and the light source cooling device according to the first embodiment as viewed from the light emitting side. The schematic diagram which shows the flow of the cooling gas which flows through a heat dissipation part and a duct in the said 1st Embodiment. The schematic diagram which shows the deformation of the heat dissipation part and the duct in the said 1st Embodiment. The schematic diagram which shows a part of the lighting apparatus provided in the projector which concerns on 2nd Embodiment of this invention. FIG. 3 is a perspective view showing a light source device and a light source cooling device included in the lighting device according to the second embodiment. The perspective view which shows the light source apparatus and the light source cooling apparatus in the said 2nd Embodiment.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.
[Outline configuration of projector]
FIG. 1 is a schematic view showing the configuration of the projector 1 according to the present embodiment.
The projector 1 according to the present embodiment modulates the light emitted from the uniform illumination device 31 described later to form an image according to the image information, and projects the image on a projected surface PS such as a screen in an enlarged manner. It is a type display device. As shown in FIG. 1, the projector 1 includes an exterior housing 2 that constitutes the exterior and an image projection device 3 housed in the exterior housing 2. In addition, although not shown, the projector 1 includes a cooling device for cooling a heating element, a control device for controlling the projector 1, and a power supply device for supplying electric power to electronic components.
One of the features of such a projector 1 is that it has a light source device 5 and a lighting device 4 capable of efficiently cooling the light source unit 51 described later.

[Configuration of image projection device]
The image projection device 3 forms and projects the above image. The image projection device 3 includes a uniform illumination device 31, a color separation device 32, a parallelizing lens 33, a light modulation device 34, a color synthesis device 35, and a projection optical device 36.
Of these, the uniform illumination device 31 emits white illumination light WL that uniformly illuminates the light modulation device 34. The configuration of the uniform lighting device 31 will be described in detail later.

The color separator 32 separates the illumination light WL incident from the uniform illumination device 31 into red, green, and blue color lights LR, LG, and LB. The color separator 32 includes a dichroic mirror 321 and 322, a reflection mirror 323, 324, 325, a relay lens 326 and 327, and an optical component housing 328 that houses them.
The dichroic mirror 321 separates the blue light LB from the illumination light WL and other colored lights (green light LG and red light LR). The separated blue light LB is reflected by the reflection mirror 323 and guided to the parallelizing lens 33 (33B).
The dichroic mirror 322 separates the green light LG and the red light LR from the other colored light separated. The separated green light LG is guided to the parallelizing lens 33 (33G). Further, the separated red light LR is guided to the parallelizing lens 33 (33R) via the relay lens 326, the reflection mirror 324, the relay lens 327 and the reflection mirror 325.
The parallelizing lens 33 (the parallelizing lenses for red, green, and blue light are 33R, 33G, and 33B, respectively) parallelizes the incident light.

The optical modulator 34 (the optical modulators for the red, green, and blue colored lights are 34R, 34G, and 34B, respectively) modulates the incident colored light LR, LG, and LB to obtain image information. Image light is formed by the corresponding color lights LR, LG, and LB. Each of these optical modulation devices 34 includes, for example, a liquid crystal panel that modulates incident light and a pair of polarizing plates arranged on the incident side and the emission side of the liquid crystal panel.

The color synthesizer 35 synthesizes the image light of each color light LR, LG, LB incident from the light modulation devices 34R, 34G, 34B. In this embodiment, such a color synthesizer 35 is composed of a cross dichroic prism.
The projection optical device 36 magnifies and projects the image light synthesized by the color synthesizer 35 onto the projected surface PS. As such a projection optical device 36, for example, a group lens composed of a lens barrel and a plurality of lenses arranged in the lens barrel can be adopted.

[Structure of uniform lighting device]
FIG. 2 is a schematic view showing the configuration of the uniform lighting device 31.
As described above, the uniform illumination device 31 emits the white illumination light WL toward the color separation device 32. As shown in FIG. 2, the uniform lighting device 31 has a lighting device 4 and a uniforming device 8, and the lighting device 4 includes a light source device 5 and an illumination light generation device 6, and a light source cooling device 7 described later (FIG. 5 and FIG. 6) and.

[Configuration of light source device]
The light source device 5 has a light source unit 51 that emits excitation light.
The light source unit 51 includes a substrate 511, an LD (Laser Diode), a plurality of solid-state light sources 512 arranged on the substrate 511, and a parallelizing lens 513 provided according to each solid-state light source 512. Excitation light, which is blue light, is emitted toward the illumination light generator 6. In the present embodiment, the solid-state light source 512 is an LD that emits excitation light having a peak wavelength of 440 nm, but an LD that emits excitation light having a peak wavelength of 446 nm may be adopted, and the peak wavelength is 440 nm and LDs that emit excitation light of 446 nm may be mixed. The excitation light emitted from these solid-state light sources 512 is parallelized by the parallelizing lens 513 and incident on the illumination light generator 6. In the present embodiment, the excitation light emitted from each solid-state light source 512 is S-polarized light.
In addition, although not shown in FIG. 2, the light source device 5 includes a heat receiving unit 52 connected to the substrate 511 and a heat radiating unit 53 connected to the heat receiving unit 52. These will be described in detail later.

[Configuration of illumination light generator]
The illumination light generation device 6 generates illumination light WL which is white light from the excitation light incident from the light source device 5, and emits the illumination light WL to the homogenization device 8. The illumination light generator 6 includes an afocal optical system 61, a homogenizer optical system 62, a first retardation element 63, an optical separator 64, a second retardation element 65, and a first collection, respectively, which correspond to the optical components of the present invention. It includes an optical element 66, a diffuser 67, a second condensing element 68, and a wavelength conversion device 69.
The light source unit 51 of the light source device 5 and the afocal optical system 61, the homogenizer optical system 62, the first retardation element 63, the second retardation element 65, the first condensing element 66, and the diffuser 67 are It is arranged on the illumination optical axis Ax1. Further, the second condensing element 68 and the wavelength conversion device 69 are arranged on the illumination optical axis Ax2 orthogonal to the illumination optical axis Ax1. The optical separation device 64 is arranged at the intersection of the illumination optical axis Ax1 and the illumination optical axis Ax2.

The afocal optical system 61 adjusts the luminous flux diameter of the excitation light incident from the light source unit 51. The afocal optical system 61 includes lenses 611 and 612. The excitation light that has passed through the afocal optical system 61 is incident on the homogenizer optical system 62.
The homogenizer optical system 62 cooperates with the light collecting elements 66 and 68 described later to make the illuminance distribution of the excitation light in each illuminated region of the diffuser 67 and the wavelength conversion device 69 uniform. The homogenizer optical system 62 includes a pair of multi-lens arrays 621 and 622 in which a plurality of small lenses are arranged in a matrix in an orthogonal plane of the optical axis. The excitation light emitted from the homogenizer optical system 62 is incident on the first retardation element 63.
The first retardation element 63 is a 1/2 wavelength plate. The first retardation element 63 converts a part of the incident excitation light which is S-polarized light into P-polarized light, and emits excitation light in which S-polarized light and P-polarized light are mixed. This excitation light is incident on the optical separator 64.

The optical separator 64 is a prism-type PBS (Polarizing Beam Splitter), in which prisms 641 and 642 formed in substantially triangular columns are bonded at an interface corresponding to the hypotenuse, thereby forming a substantially rectangular parallelepiped shape. There is. This interface is inclined by approximately 45 ° with respect to each of the illumination optical axis Ax1 and the illumination optical axis Ax2. A polarization separation layer 643 is formed at the interface of the prism 641 located on the first retardation element 63 side (that is, the light source portion 51 side) in the optical separation device 64.
The polarization separation layer 643 has wavelength-selective polarization separation characteristics. Specifically, the polarization separation layer 643 has a property of reflecting one of the S-polarized light and the P-polarized light contained in the excitation light and transmitting the other to separate the polarized light. Further, the polarization separation layer 643 has a property of transmitting fluorescent light (light including green light and red light) generated by the wavelength conversion device 69 regardless of the polarization state.
With such an optical separator 64, in the present embodiment, of the excitation light incident from the first retardation element 63, the P-polarized light is transmitted to the second retardation element 65 side along the illumination optical axis Ax1. Then, the S-polarized light is reflected toward the second condensing element 68 along the illumination light axis Ax2.

The second retardation element 65 is a 1/4 wave plate, converts the excitation light (linearly polarized light) incident from the optical separator 64 into circular polarization, and the excitation light (linearly polarized light) incident from the first condensing element 66. Converts (circularly polarized light) to linearly polarized light.
The first condensing element 66 is an optical element that condenses (focuses) the excitation light transmitted through the second retardation element 65 on the diffusing device 67, and is composed of three lenses in the present embodiment. However, the number of lenses constituting the first condensing element 66 is not limited to three.
The diffuser 67 diffuses and reflects the incident excitation light at a diffusion angle similar to that of the fluorescent light generated and emitted by the wavelength converter 69. Although not shown, the diffuser 67 includes a reflector that Lambertian-reflects incident light and a rotating device that rotates and cools the reflector.

The excitation light diffusely reflected by the diffuser 67 is incident on the second retardation element 65 again via the first condensing element 66. When reflected by the diffuser 67, the circularly polarized light incident on the diffuser 67 becomes circularly polarized light in the opposite direction, and in the process of passing through the second retardation element 65, P incident from the light separator 64. It is converted into S-polarized excitation light whose polarization direction is rotated by 90 ° with respect to the polarized excitation light. Then, the excitation light is reflected by the polarization separation layer 643 and is incident on the homogenizing device 8 as blue light along the illumination optical axis Ax2. That is, the excitation light diffusely reflected by the diffuser 67 is emitted by the optical separator 64 in the direction of the illumination optical axis Ax2.

The second condensing element 68 and the wavelength conversion device 69 are arranged on the illumination optical axis Ax2 as described above.
The second focusing element 68 focuses the excitation light of the S-polarized light incident from the first retardation element 63 via the polarization separation layer 643 on the wavelength conversion device 69. In the present embodiment, the second condensing element 68 is configured as a lens group having three lenses like the first condensing element 66, but the number of lenses does not matter.

The wavelength conversion device 69 converts the incident excitation light into fluorescent light. The wavelength conversion device 69 includes a wavelength conversion element 691 and a rotating device 695.
Of these, the rotating device 695 is composed of a motor or the like that rotates around the central axis of the wavelength conversion element 691.

The wavelength conversion element 691 has a substrate 692, and a phosphor layer 693 and a reflection layer 694 located on the surface of the substrate 692 on the incident side of the excitation light.
The substrate 692 is formed in a substantially circular shape when viewed from the incident side of the excitation light. The substrate 692 can be made of metal, ceramics, or the like.
The phosphor layer 693 is a wavelength conversion layer including a phosphor that is excited by the incident excitation light and emits fluorescent light (for example, fluorescent light having a peak wavelength in the wavelength range of 500 to 700 nm). A part of the fluorescent light generated in the phosphor layer 693 is emitted to the second condensing element 68 side, and the other part is emitted to the reflection layer 694 side.
The reflection layer 694 is arranged between the phosphor layer 693 and the substrate 692, and reflects the fluorescent light incident from the phosphor layer 693 toward the second condensing element 68.
The fluorescent light emitted from such a wavelength conversion element 691 is unpolarized light. This fluorescent light is incident on the polarization separation layer 643 of the light separation device 64 via the second condensing element 68, is transmitted through the polarization separation layer 643 along the illumination optical axis Ax2, and is incident on the homogenizing device 8. To.

In this way, of the excitation light emitted from the light source device 5 (light source unit 51) and incident on the light separation device 64, the P-polarized light passes through the second retardation element 65 and is diffused by the diffuser 67. After being reflected, it is converted into S-polarized light by passing through the second retardation element 65 again, and is reflected by the optical separator 64 toward the homogenizing device 8.
On the other hand, of the excitation light emitted from the light source device 5 and incident on the light separation device 64, the S-polarized light is converted into fluorescent light by the wavelength conversion device 69 and then transmitted through the light separation device 64 to be uniform. It is emitted to the conversion device 8 side.
That is, the blue light and the fluorescent light (light including green light and red light) that are a part of the excitation light are combined by the light separation device 64 and incident on the homogenizing device 8 as white illumination light WL. To. Therefore, the optical separation device 64 can also be called a photosynthetic device.

[Configuration of homogenizer]
The homogenizing device 8 not only equalizes the illuminance in the optical axis orthogonal plane of the light incident on each light modulation device 34 (34R, 34G, 34B) which is the illuminated region of the uniform lighting device 31, and also sets the polarization direction. It has a function of aligning. The homogenizing device 8 includes a first lens array 81, a second lens array 82, a polarization conversion element 83, and a superposed lens 84, which are arranged on the illumination optical axis Ax2, respectively.
The first lens array 81 has a configuration in which the first lens 811 is arranged in a matrix in a plane orthogonal to the illumination optical axis Ax2, and the incident illumination light WL is divided into a plurality of partial luminous fluxes.
The second lens array 82 has a configuration in which the second lens 821 corresponding to the first lens 811 is arranged in a matrix in a plane orthogonal to the illumination optical axis Ax2. The second lens array 82 superimposes a plurality of partial luminous fluxes divided by each first lens 811 on each light modulation device 34 together with the superimposing lens 84.
The polarization conversion element 83 is arranged between the second lens array 82 and the superimposing lens 84, and aligns the polarization directions of the plurality of partial luminous fluxes. The illumination light WL formed by the plurality of partial luminous fluxes whose polarization directions are aligned by the polarization conversion element 83 is incident on the color separator 32 via the superimposing lens 84.

[Configuration of light source device]
FIG. 3 is a perspective view showing the light source device 5 as seen from the light emitting side. In FIG. 3, the cover member 55 constituting the heat radiating portion 53 is not shown, and in consideration of visibility, only a part of the parallelizing lens 513 and the accommodating portion 5141 is designated with reference numerals.
As shown in FIG. 3, the light source device 5 includes the light source unit 51, a heat receiving unit 52 connected to the support member 514 of the light source unit 51, and a heat radiating unit 53 connected to the heat receiving unit 52.

[Structure of light source unit]
The light source unit 51 has the above-mentioned substrate 511, solid light source 512, and parallelizing lens 513, respectively, and further has a support member 514 that supports them.
The support member 514 is formed in a substantially rectangular parallelepiped shape, and has a plurality of accommodating portions 5141 which are substantially cylindrical holes in which one solid light source 512 (not shown in FIG. 3) and one parallelizing lens 513 are accommodated. These accommodating portions 5141 are arranged on the rectangular surface 514A orthogonal to the illumination optical axis Ax1 in the support member 514 along the longitudinal direction and the lateral direction of the surface 514A, whereby each accommodating portion 5141 is arranged. The solid-state light source 512 and the parallelizing lens 513 housed in the above are arranged in a matrix in a plane orthogonal to the illumination optical axis Ax1.
Further, in the support member 514, the substrate 511 is arranged on the side opposite to the emission direction of the excitation light from the solid-state light source 512.

Such a support member 514 is made of a metal having thermal conductivity. Therefore, the support member 514 has a function of stably supporting the substrate 511, the solid-state light source 512, and the parallelizing lens 513, dissipates heat conducted by contacting the support member 514, and receives the heat from the heat receiving unit 52. It also has a function of conducting to.

In the following description, the traveling direction of the excitation light emitted from the light source unit 51 is the + Z direction, and the two directions orthogonal to the + Z direction are the + X direction and the + Y direction, respectively. Of these + X directions and + Y directions, the + X direction is one direction along the longitudinal direction of the surface 514A, and the + Y direction is one direction along the lateral direction of the surface 514A. More specifically, when looking at the surface 514A so that the longitudinal direction of the surface 514A is the left-right direction and the lateral direction is the vertical direction, the direction from left to right is the + X direction, and from bottom to top. The direction to go is the + Y direction. Even when the surface 514A has a shape other than a rectangle, or when the solid-state light source 512 and the parallelizing lens 513 are randomly arranged, one of the two directions orthogonal to the + Z direction and orthogonal to each other is used. The + X direction and the other may be the + Y direction.
Further, the direction opposite to the + Z direction is defined as the −Z direction. The same applies to the −X direction and the −Y direction.
The + Y direction corresponds to the first direction of the present invention, the + Z direction corresponds to the second direction of the present invention, and the + X direction corresponds to the third direction of the present invention.

[Structure of heat receiving part]
The heat receiving portion 52 is a substantially rectangular parallelepiped flat plate member formed of a material having thermal conductivity (for example, metal), and has larger dimensions in the + X direction and + Y direction than the support member 514. At the substantially center of the surface 52A on the + Z direction side of the heat receiving portion 52, the surface (surface 514A) on the −Z direction side of the support member 514 so that the longitudinal direction of the support member 514 coincides with the longitudinal direction of the heat receiving portion 52. The surface on the opposite side) is connected so that heat can be conducted. As a result, the heat generated in the light source unit 51 is conducted to the heat receiving unit 52 via the support member 514.

[Structure of heat dissipation part]
FIG. 4 is a perspective view showing a light source device 5 viewed from a side opposite to the light emitting side. Also in FIG. 4, the cover member 55 constituting the heat radiating portion 53 is not shown.
The heat radiating unit 53 is electrically conductively connected to the heat receiving unit 52, and dissipates the heat conducted from the heat receiving unit 52 to the cooling gas circulated by driving the fan 72, which will be described later. , The light source unit 51 is cooled.
As shown in FIGS. 3 and 4, the heat radiating portion 53 includes a main body portion 54 and a cover member 55 (see FIGS. 5 and 6) that connects the main body portion 54 to the duct 71 of the light source cooling device 7 described later. , Have.

[Structure of main body]
The main body 54 is a so-called heat sink in which a plurality of plate-shaped bodies 541 along the YZ plane defined by the + Y direction and the + Z direction are arranged to face each other along the + X direction.
As shown in FIG. 4, the main body portion 54 has an opening 54B1 and a shielding portion 54B2 on an end surface 54B on the −Z direction side (end surface 54B connecting the ends on the −Z direction side in a plurality of plate-shaped bodies 541). Has.
The opening 54B1 is a portion where the gap between the plate-shaped bodies 541 is exposed, and is a portion for introducing the cooling gas flowing from the −Z direction side into the main body portion 54. The opening 54B1 is formed over the entire area from the end on the + X direction side to the end on the −X direction side of the end face 54B so that the cooling gas flows through all the plate-shaped bodies 541. Such an opening 54B1 is located at a position corresponding to the heat receiving portion 52 when viewed from the −Z direction side, and in the present embodiment, is located substantially at the center of the end face 54B in the + Y direction. More specifically, when the heat radiating portion 53 is viewed from the −Z direction side, the opening 54B1 is positioned so that the center position of the opening 54B1 substantially coincides with the center position of the heat receiving portion 52.

The shielding portion 54B2 is located around the opening 54B1 on the end face 54B, shields a part of the cooling gas flowing along the + Z direction from the −Z direction side, and transmits the cooling gas through the opening 54B1. Guide it into the main body 54. In the present embodiment, the shielding portion 54B2 is a portion of the end surface 54B other than the opening 54B1, and is positioned so as to sandwich the opening 54B1 located substantially in the center of the end surface 54B on the + Y direction side and the −Y direction side. There is. When the heat radiating portion 53 (main body portion 54) is viewed from the −Z direction side, if the center position of the opening 54B1 is deviated from the center position of the main body portion 54 to the + Y direction side or the −Y direction side. The dimensions of each shielding portion 54B2 in the + Y direction can also be changed according to the center position of the opening portion 54B1.
In this embodiment, such a shielding portion 54B2 is formed by attaching a flat plate-shaped member to the end face 54B. However, the present invention is not limited to this, and the plate-shaped bodies 541 may be formed by bending the ends on the −Z direction side in the same direction (for example, in the + X direction).

Further, as shown in FIGS. 3 and 4, the main body portion 54 is connected to the end face 54A on the + Z direction side (the end face 54A connecting the ends on the + Z direction side of the plurality of plate-shaped bodies 541), and the connection portion 54A1 and the discharge. It has a part 54A2.
The connecting portion 54A1 is a portion where the end face on the −Z direction side of the heat receiving portion 52 is thermally conductively connected, and is located substantially in the center of the end face 54A in the + Y direction in the present embodiment. The dimensions of the connecting portion 54A1 in the + Y direction are substantially the same as the dimensions of the heat receiving portion 52 in the + Y direction. Such a connecting portion 54A1 may be configured by attaching a flat plate-shaped member like the shielding portion 54B2, or may be configured by bending each plate-shaped body 541, and nothing is added or processed. It may be a site.

The discharge portion 54A2 is located at a portion other than the connection portion 54A1 on the end surface 54A, and is provided at two locations so as to sandwich the connection portion 54A1 in the present embodiment. These discharge portions 54A2 are portions where the gaps between the plate-shaped bodies 541 along the + Y direction are exposed to the outside, in other words, the cooling introduced into the main body portion 54 through the opening 54B1 and distributed to the connection portion 54A1. This is the part that discharges gas. These discharge portions 54A2 are arranged to face the introduction port of the duct 71, which will be described later, and the cooling gas discharged through the discharge portion 54A2 is introduced into the duct 71 through the introduction port.
In the present embodiment, the gaps between the plate-shaped bodies 541 are exposed on the end faces 54C on the + Y direction side and the end faces 54D on the −Y direction side of the main body 54, but these end faces 54C and 54D Is closed by being covered with a cover member 55, which will be described later. However, the present invention is not limited to this, and the end faces 54C and 54D may be closed by attaching a flat plate-shaped member, bending the plate-shaped body 541, or the like.

[Construction of cover member]
5 and 6 are perspective views showing the light source device 5 and the light source cooling device 7. Of these, FIG. 5 is a perspective view of the light source device 5 and the light source cooling device 7 as viewed from the side opposite to the light emitting side (−Z direction side) of the light source device 5, and FIG. 6 is a perspective view of the light source device 5. It is a perspective view which looked at the light source cooling device 7 from the light emitting side (+ Z direction side).
As shown in FIGS. 5 and 6, the cover member 55 covers the main body 54 connected to the light source 51 and the heat receiving portion 52 from the −Z direction side, and is attached to the duct 71 constituting the light source cooling device 7. Is.
As shown in FIG. 5, the cover member 55 has an opening 551 having the same shape and dimensions as the opening 54B1 formed at a position corresponding to the opening 54B1. In the cover member 55, the portion of the surface 55B on the −Z direction side other than the opening 551 shields the cooling gas so that the cooling gas does not flow into the cover member 55 from the portion other than the opening 551. ing. From this, the portion other than the opening 551 can be said to be a shielding portion in the cover member 55.

A recess 552 is formed at a position on the + Z direction side on the end faces of the cover member 55 in the + X direction and the −X direction, and the heat receiving portion 52 is fitted in the recess 552. Therefore, a part of the heat conducted to the heat receiving portion 52 is directly conducted to the cover member 55 and dissipated, and the cover member 55 is connected to the main body portion 54, so that the heat is conducted to the main body portion 54. A part of the generated heat is also dissipated by the cover member 55.

Further, the cover member 55 has a connecting portion 553 connected to the first duct portion 711 of the duct 71 and a second duct portion at a position sandwiching the light source portion 51 and the heat receiving portion 52 on the end surface on the + Z direction side. It has a connection portion 554 connected to the 712. Although not shown, openings are formed in these connection portions 535 and 554 at positions corresponding to the discharge portions 54A2, so that the cooling gas discharged from the discharge portions 54A2 can open the openings. It is discharged to the outside of the heat radiating unit 53 through the heat dissipation unit 53.

[Configuration of light source cooling device]
As described above, the light source cooling device 7 is connected to the heat radiating unit 53 of the light source device 5, and the cooling gas is circulated through the heat radiating unit 53 to cool the heat radiating unit 53, and thus the heat receiving unit 52 and the light source unit 51. To do. The light source cooling device 7 has a duct 71 and a fan 72 as shown in FIGS. 5 and 6.
The duct 71 connects the first duct portion 711 and the second duct portion 712 extending in the + Z direction and these duct portions 711 and 712, respectively, and allows the cooling gas flowing through the duct portions 711 and 712 to be supplied. It is provided with a merging portion 713 to be merged, and is formed in a laterally substantially U shape when viewed from the −X direction side. Then, in the space SP between the first duct portion 711 and the second duct portion 712, a housing (not shown) accommodating the illumination light generation device 6 or a housing 328 for optical components of the color separation device 32 is provided. A part of is placed.

The end portion of the first duct portion 711 opposite to the merging portion 713 (the end portion on the −Z direction side) is configured as a connecting portion 7111 to which the connecting portion 553 is connected, and the merging portion in the second duct portion 712. The end portion on the opposite side of the 713 (the end portion on the −Z direction side) is configured as a connecting portion 7121 to which the connecting portion 554 is connected.
Although not shown in FIGS. 5 and 6, the cooling gas discharged from the heat radiating part 53 through the discharge part 54A2 and the opening is introduced into each of the duct parts 711 and 712 in these connection parts 7111 and 7121. Introductory ports 7112 and 7122 (see FIG. 7) are formed.

The merging section 713 merges the cooling gas flowing through the duct sections 711 and 712 and discharges the cooling gas to the outside of the duct 71. An exhaust port 7131 for discharging the cooling gas is formed at the end of the confluence portion 713 on the + Z direction side, and a fan 72 is arranged in the exhaust port 7131.
The fan 72 sucks the cooling gas introduced into the heat radiating unit 53 through the duct 71 and discharges it from the exhaust port 7131.

[Flow of cooling gas driven by fan]
FIG. 7 is a schematic view showing the flow of cooling gas flowing through the heat radiating unit 53 and the duct 71 when the fan 72 is driven. In FIG. 7, the cover member 55 is not shown.
When the fan 72 is driven, as shown in FIG. 7, the cooling gas F outside the heat radiating portion 53 is introduced into the heat radiating portion 53, that is, into the main body portion 54 through the openings 551 and 54B1. The cooling gas F travels in the + Z direction through the gap between the plate-shaped bodies 541, is located in the + Z direction with respect to the opening 54B1, and reaches the connecting portion 54A1 connected to the heat receiving portion 52.

Here, the dimension L1 of the opening 54B1 in the + Y direction is equal to or less than the dimension L2 of the connecting portion 54A1 to which the heat receiving portion 52 is connected in the + Y direction, and in the present embodiment, the dimension L1 is smaller than the dimension L2. Further, when the heat radiating portion 53 (main body portion 54) is viewed from the −Z direction side, the + Y direction edge of the opening 54B1 is located on the −Y direction side of the + Y direction edge of the connecting portion 54A1. The position of the opening 54B1 is set so that the edge in the −Y direction of the opening 54B1 is located on the + Y direction side of the edge on the −Y direction side of the connecting portion 54A1.
Therefore, the cooling gas F introduced into the heat radiating section 53 is circulated to the portion S of the connecting section 54A1 corresponding to the heat receiving section 52, and the connecting section 54A1, and by extension, the heat receiving section 52 and the light source section 51 are effectively cooled. Will be done.

After that, the cooling gas F flowing to the portion S is further sucked by the fan 72, a part of the cooling gas F1 flows between the plate-shaped bodies 541 in the + Y direction, and the other cooling gas F2 is the plate-shaped body. It circulates between 541 in the -Y direction. At this time, the heat conducted to the plate-shaped body 541 is conducted to the cooling gases F1 and F2, whereby the plate-shaped body 541 and the main body portion 54 are cooled.
Then, the cooling gas F1 that has passed between the plate-shaped bodies 541 and circulated in the main body portion 54 in the + Y direction side is introduced into the first duct portion 711 via the discharge portion 54A2 and the connecting portion 553. Further, the cooling gas F2 that has also passed between the plate-shaped bodies 541 and circulated in the main body portion 54 in the −Y direction side is introduced into the second duct portion 712 via the discharge portion 54A2 and the connection portion 554.
The cooling gases F1 and F2 introduced into the duct portions 711 and 712 circulate in the duct portions 711 and 712 in the + Z direction, reach the merging portion 713, and pass through the exhaust port 7131 of the merging portion 713. It is discharged by the fan 72.
In this way, the light source device 5 is cooled.

[Effect of the first embodiment]
According to the projector 1 according to the present embodiment described above, there are the following effects.
The end face 54B on the −Z direction side of the main body 54 of the heat radiating portion 53 is a shielding portion that shields the cooling gas flowing through the end face 54B and introduces the cooling gas into the main body 54 only through the opening 54B1. 54B2 is located around the opening 54B1. Further, the opening 54B1 is located at a position corresponding to the connecting portion 54A1 in which the heat of the heat receiving portion 52 is conducted when viewed from the −Z direction side. According to this, the cooling gas introduced into the heat radiating portion 53 (main body portion 54) through the openings 551 and 54B1 of the light source device 5 can be circulated to the connecting portion 54A1 which becomes high temperature in the shortest distance. Therefore, the connection portion 54A1 can be efficiently cooled, and the heat receiving portion 52 and the light source portion 51 can be efficiently cooled.

As described above, the cooling gas flowing inside the heat radiating portion 53 (main body portion 54) through the openings 551 and 54B1 flows between the plurality of plate-shaped bodies 541 along the + Z direction. According to this, as described above, the cooling gas can be reliably circulated to the connecting portion 54A1 located on the + Z direction side with respect to the opening 551. Therefore, the connection portion 54A1 can be efficiently cooled, and the heat receiving portion 52 and the light source portion 51 can be reliably and efficiently cooled.

In the end surface 54B on the −Z direction side of the main body portion 54, the shielding portion 54B2 is located on the + Y direction side and the −Y direction side so as to sandwich the opening 54B1. According to this, it is possible to lengthen the flow path in which the cooling gas introduced through the opening 54B1 flows in the + Y direction and the −Y direction along the space between the plate-shaped bodies 541. Therefore, the plurality of plate-shaped bodies 541 in which heat is conducted from the connecting portion 54A1 can be efficiently cooled.

Here, when the dimension of the opening 54B1 in the + Y direction is larger than the dimension of the connecting portion 54A1 in which heat is conducted from the heat receiving portion 52 in the + Y direction, a cooling gas that does not flow through the connecting portion 54A1 is likely to be generated. The cooling efficiency of the connecting portion 54A1 is reduced. On the other hand, the dimension L1 of the opening 54B1 in the + Y direction is smaller than the dimension L2 of the connecting portion 54A1 in the + Y direction, which substantially matches the dimension of the heat receiving portion 52 in the + Y direction. According to this, almost all of the cooling gas introduced from the opening 54B1 can be reliably circulated to the connecting portion 54A1. Therefore, the cooling efficiency of the connecting portion 54A1, the heat receiving portion 52, and the light source portion 51 can be further improved.

The main body portion 54 constituting the heat radiating portion 53 has a discharge portion 54A2 for discharging the cooling gas flowing through the connection portion 54A1 to the outside on the + Y direction side and the −Y direction side with respect to the connection portion 54A1. According to this, the cooling gas that has cooled the connection portion 54A1 can be circulated smoothly in the + Y direction side and the −Y direction side. Therefore, since the cooling gas can be reliably circulated along the plate-shaped body 541, the cooling of the plate-shaped body 541 and the cooling efficiency of the heat receiving unit 52 and the light source unit 51 can be improved. Further, since the cooling gas is circulated and discharged without delay in this way, the flow velocity of the cooling gas can be increased, and in this respect as well, the cooling efficiency of the heat conducted through the connection portion 54A1 can be improved. As a result, the cooling efficiency of the heat receiving unit 52 and the light source unit 51 can be improved.

The discharge portion 54A2 is located on the same end surface 54A as the connection portion 54A1 in the main body portion 54 of the heat dissipation portion 53. According to this, it is possible to suppress an increase in the dimension in the + Y direction of the lighting device 4 including the light source device 5 and the light source cooling device 7 having the duct 71 connected to the discharge unit 54A2 of the light source device 5.

[Modification of the first embodiment]
In the light source device 5 and the light source cooling device 7, the main body 54 of the heat radiation unit 53 has a discharge unit 54A2 on the + Y direction side and the −Y direction side of the end surface 54A on the + Z direction side, and the heat radiation unit 53 covers the heat radiation unit 53. The members 55 were connected to the first duct portion 711 and the second duct portion 712 by the connecting portions 535 and 554 located on the + Y direction side and the −Y direction side on the end surface on the + Z direction side. However, the connection position between the heat radiating unit 53 and the duct 71 is not limited to this, and may be another position.

FIG. 8 is a schematic view showing deformation of the heat radiating portion 53 and the duct 71.
For example, the discharge direction of the cooling gas from the heat radiating unit 53 may be the + Y direction and the −Y direction as shown in FIG. 8 instead of the + Z direction. In this case, the portion where the discharge portion 54A2 is set is closed in the end surface 54A of the main body portion 54, the end faces 54C and 54D are opened, and the discharge portions 54C1 and 54D1 for discharging the cooling gas to the end faces 54C and 54D1. To set. Similarly, in the cover member 55 that covers the main body 54, the same connecting portions 555 and 556 as the connecting portions 535 and 554 connected to the duct 71 are set at positions corresponding to the discharging portions 54C1 and 54D1.
On the other hand, the connection portion 7111 of the first duct portion 711 of the duct 71 is set in the vicinity of the end portion on the −Z direction side and the portion on the −Y direction side of the first duct portion 711, and the second duct portion is set. The connecting portion 7121 of the 712 is set in the vicinity of the end portion on the −Z direction side and the portion on the + Y direction side of the second duct portion 712.

Then, when the heat radiating section 53 is connected to the duct 71 and the fan 72 is driven so that the connecting sections 7111, 7121 and the discharging sections 54C1, 54D1 face each other, the main body of the heat radiating section 53 is similarly driven. The cooling gas F introduced into the 54 travels in the + Z direction through the gap between the plate-shaped bodies 541 and reaches the portion S in the connecting portion 54A1.
After that, a part of the cooling gas F1 flows between the plate-shaped bodies 541 in the + Y direction, and passes through the discharge portion 54C1 and the connection portion 555, 7111 set on the end surface 54C on the + Y direction side of the main body portion 54. , Flows into the first duct portion 711. Further, the other cooling gas F2 flows between the plate-shaped bodies 541 in the −Y direction, and passes through the discharge portion 54D1 and the connecting portion 556,7121 set on the end surface 54D on the −Y direction side of the main body portion 54. , Flows into the second duct portion 712. The cooling gases F1 and F2 introduced into the duct portions 711 and 712 circulate in the duct portions 711 and 712 in the + Z direction, respectively, in the same manner as described above, and pass through the exhaust port 7131 of the merging portion 713 to the fan 72. Is discharged by.

According to the lighting device 4 having such a light source device 5 and a light source cooling device 7, the same effect as described above can be obtained, and the cooling gas can be circulated over the entire surface of the plate-shaped body 541 along the + Y direction. it can. Therefore, the cooling efficiency of each plate-shaped body 541 can be improved, and by extension, the cooling efficiency of the heat receiving unit 52 and the light source unit 51 can be improved.

[Second Embodiment]
Next, the second embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projector 1, but the projector 1 and the projector 1 are provided with two light source devices 5 and these two light source devices 5 are connected to one duct. It's different. In the following description, parts that are the same as or substantially the same as those already described will be designated by the same reference numerals and description thereof will be omitted.

FIG. 9 is a schematic view showing a part of the lighting device 4A included in the projector according to the present embodiment. Further, FIG. 10 is a perspective view showing the light source devices 5A and 5B and the light source cooling device 7A included in the lighting device 4A. Further, FIG. 11 is a perspective view showing the light source devices 5A and 5B and the light source cooling device 7A from which the cover member 55 is removed from the state shown in FIG.
The projector according to the present embodiment has the same configuration and function as the projector 1 except that it has a lighting device 4A instead of the lighting device 4.
Further, the lighting device 4A includes two light source devices 5 (5A, 5B) and a photosynthetic member PM as shown in FIG. 9, and further replaces the light source cooling device 7 as shown in FIGS. 10 and 11. Other than the light source cooling device 7A, it has the same configuration and function as the lighting device 4.

[Configuration of light source cooling device]
As shown in FIGS. 10 and 11, the light source cooling device 7A has the same configuration as the light source cooling device 7 except that it has a duct 73 instead of the duct 71.
Similar to the duct 71, the duct 73 connects the first duct portion 731 and the second duct portion 732 extending in the + Z direction, respectively, and the duct portions 731 and 732 on the + Z direction side, and these ducts. It has a merging section 713 that merges and discharges the cooling gas that has flowed through the sections 731 and 732.

As shown in FIGS. 9 and 10, the ends of the first duct portion 731 and the second duct portion 732 on the −Z direction side are the connection portions 535 and 554 of the light source device 5A, similarly to the duct portions 711 and 712. It is configured as connecting portions 7311 and 7321 connected to.
Further, at a portion of each duct portion 731,732 on the + X direction side end surface on the −Z direction side, connection portions 7313, 7323 connected to the connection portions 533, 554 of the light source device 5B are provided in the + X direction from the end surface. It is provided so as to protrude.
As shown in FIG. 10, the connection portions 7311 and 7321 are formed with introduction ports 7312 and 7322 at positions facing the discharge portion 54A2 of the light source device 5A, and the connection portions 7313 and 7323 discharge the light source device 5B. Introductory ports 7314 and 7324 are formed at positions facing the portions 54A2.

The light source devices 5A and 5B attached to such a duct 73 are arranged so that the emission directions of the excitation light are orthogonal to each other. Then, as shown in FIG. 9, the photosynthetic member PM is arranged so as to face each of the light source devices 5A and 4B. One of these light source devices 5A and 5B is arranged on the illumination optical axis Ax1.
The photosynthetic member PM transmits the excitation light emitted from one of the light source devices 5A and 5B along the illumination light axis Ax1 and transmits the excitation light emitted from the other light source device along the illumination light axis Ax1. These excitation lights are synthesized by reflecting along the above. The excitation light that has passed through the photosynthetic member PM is incident on the afocal optical system 61.

[Flow of cooling gas]
In the light source cooling device 7A shown in FIGS. 10 and 11, when the fan 72 located in the merging portion 713 is driven, the cooling gas dissipates heat through the openings 551 and 54B1 of the light source devices 5A and 5B. Inflow into. As described above, this cooling gas flows between the plate-shaped bodies 541 of the main body portion 54 and reaches the portion S of the connecting portion 54A1 connected to the heat receiving portion 52, and then a part of the cooling gas is + Y. It circulates in the direction side, and other cooling gases circulate in the −Y direction side.
The cooling gas flowing in the + Y direction side in the light source device 5A flows into the first duct part 731 via the discharging part 54A2 and the connecting part 533, 7311, and the cooling gas flowing in the −Y direction side is discharged part. It flows into the second duct portion 732 via the 54A2 and the connecting portions 554, 7321.
The cooling gas flowing in the + Y direction side in the light source device 5B flows into the first duct part 731 via the discharging part 54A2 and the connecting part 533, 7313, and the cooling gas flowing in the −Y direction side is discharged part. It flows into the second duct portion 732 via the 54A2 and the connecting portions 554, 7323.
The cooling gas flowing into each of these duct portions 731 and 732 merges at the merging portion 713 and is discharged to the outside from the exhaust port 7131 by the fan 72.

[Effect of the second embodiment]
According to the projector according to the present embodiment described above, the same effect as that of the projector 1 can be obtained, and the following effects can be obtained.
The light source device 5A is arranged so that the excitation light emitted from the light source unit 51 travels in the + Z direction, and the light source device 5B is arranged so that the excitation light emitted from the light source unit 51 travels in the −X direction. To. The plate-shaped body 541 of the light source device 5A is along the YZ plane, and the plate-shaped body 541 of the light source device 5B is along the XY plane. That is, even if the plate-shaped bodies 541 of the light source devices 5A and 5B are extended in the + Y direction or the −Y direction, they do not interfere with the light source devices 5A and 5B. According to this, these light source devices 5A and 5B can be arranged close to each other so that the plate-shaped bodies 541 of the respective light source devices 5A and 5B do not interfere with each other. Therefore, it is possible to suppress the increase in size of the lighting device 4A due to the provision of the two light source devices 5A and 5B.

The lighting device 4A includes the light source devices 5A and 5B, and a photosynthetic member PM that synthesizes the light emitted from the light source devices 5A and 5B. According to this, the light emitted from these light source devices 5A and 5B can be used as one luminous flux, and the amount of light emitted can be increased as compared with the lighting device 4 having one light source device 5. Therefore, it is possible to form and project an image having higher brightness.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the range in which the object of the present invention can be achieved are included in the present invention.
The heat radiating portion 53 has a main body portion 54 which is a heat sink, and a cover member 55 which covers the main body portion 54 and attaches the main body portion 54 to the ducts 71 and 73. However, the present invention is not limited to this. For example, if the main body 54 can be directly attached to the ducts 71, 73, etc., the cover member 55 may be omitted. In this case, for example, when the heat radiating unit 53 (main body 54) is connected so that the discharge unit 54A2 and the connection units 7111, 7121, 7311, 7313, 7321, 7323 of the ducts 71 and 73 face each other, the case is concerned. The end faces 54C and 54D of the main body 54 may be closed.

When the heat radiating portion 53 is viewed from the −Z direction side, the opening 54B1 is located substantially in the center of the end face 54B in the + Y direction, and the shielding portion 54B2 sandwiches the opening 54B1 on the + Y direction side and the −Y direction side. It was supposed to be placed in. Further, it is assumed that the opening 551 is formed according to the opening 54B1. However, the present invention is not limited to this. That is, the positions of the openings 54B1 and 551 may be any positions in the plane of the main body 54 and the cover member 55 on the −Z direction side, and the positions of the shielding portions 54B2 are also located around the openings 54B1. , Any position is acceptable. The term “periphery” as used herein indicates a position connected to the edge of the opening 54B1 and does not necessarily have to surround the opening 54B1. Further, as described above, when the shielding portion 54B2 is located on the + Y direction side and the −Y direction side with respect to the opening 54B1, the dimensions of each shielding portion 54B2 in the + Y direction may be different or the same. Good.

The dimension L1 of the opening 54B1 in the + Y direction is smaller than the dimension L2 of the heat receiving portion 52 and the connecting portion 54A1 in the + Y direction. However, the present invention is not limited to this. That is, the dimension L1 may be the same as the dimension L2 as long as the cooling gas introduced into the main body 54 through the opening 54B1 can be distributed to the connection portion 54A1 (particularly the portion S). It may be larger. Further, when the fan discharges the cooling gas to the heat radiating unit 53 (main body 54), the flow direction of the cooling gas to the heat radiating unit 53 is on the + Y direction side or the −Y direction side with respect to the + Z direction, or , When it is inclined to the + X direction side or the −X direction side, the position of the opening 54B1 may be deviated from the connecting portion 54A1 in the flow direction of the cooling gas.

The cooling gas introduced into the main body 54 and flowing to the connection 54A1 passes through the discharge 54A2 or the discharge 54C1, 54D1 located on the + Y direction side and the −Y direction side with respect to the connection 54A1. It was assumed that it was discharged to the outside of 54. However, the present invention is not limited to this. For example, only one of the discharge portions 54A2, 54C1, 54D1 may be provided in the main body portion 54. In this case, the opening 54B1 may be configured to be located on the end surface 54B on the end side opposite to the one discharging portion. Further, when the duct is connected to the end face 54B, the discharge portion may be located on the end face 54B. That is, the discharge portion may be located anywhere in the main body portion 54.

It is assumed that the ducts 71 and 73 connected to the light source device 5 are formed in a substantially U shape in the horizontal direction as described above. However, the present invention is not limited to this. For example, it can be appropriately changed according to the position and number of the discharge units 54A2. Further, the duct connected to the openings 551 and 54B1 to guide the cooling gas and the fan to send the cooling gas into the duct are replaced with the ducts 71 and 73 and the fan 72 of the light source cooling devices 7 and 7A. Alternatively, it may be adopted in addition. Further, without providing the ducts 71 and 73 themselves, the inner surface of the outer housing 2 of the projector 1, the outer surface of the housing (not shown) accommodating the illumination light generator 6, or the outer surface of the housing 328 for optical components. A flow path for the cooling gas that cools the light source device 5 may be formed in the space between the two.

It is assumed that the projector 1 includes three optical modulation devices 34 (34R, 34G, 34B) each having a liquid crystal panel. However, the present invention is not limited to this. That is, the present invention can be applied to a projector using two or less or four or more optical modulation devices.
Further, although the light modulator 34 uses a transmissive liquid crystal panel in which the light incident surface and the light flux emitting surface are different, a reflective liquid crystal panel in which the light incident surface and the light emitting surface are the same may be used. Good. Further, if it is an optical modulation device capable of forming an image according to image information by modulating an incident light beam, a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like, other than liquid crystal An optical modulator may be used.
Further, the arrangement of each optical component constituting the image projection device 3 is not limited to the arrangement shown in FIGS. 1 and 2, and may be another arrangement.

In each of the above embodiments, the light source device 5 includes a light source unit 51 having a solid light source 512 which is an LD. However, the present invention is not limited to this. For example, a light source unit having another solid light source such as an LED may be adopted, or a light source unit having a light source lamp may be adopted.
Further, in each of the above embodiments, as the optical components constituting the lighting devices 4 and 4A, the afocal optical system 61, the homogenizer optical system 62, the first phase difference element 63, the optical separation device 64, the second phase difference element 65, and the like. The first condensing element 66, the diffusing device 67, the second condensing element 68, and the wavelength conversion device 69 are mentioned. However, the present invention is not limited to this. That is, the functions and configurations of the optical components can be appropriately changed according to the use of the lighting device having the light source device 5.
Further, in each of the above embodiments, an example is shown in which the light source device 5 and the lighting devices 4 and 4A of the present invention are applied to the projector 1. However, the present invention is not limited to this. For example, the light source device according to the present invention may be used for lighting equipment, headlights of automobiles, and the like.

1 ... Projector, 34 (34B, 34G, 34R) ... Optical modulator, 36 ... Projection optical device, 4,4A ... Lighting device, 5 (5A, 5B) ... Light source device, 51 ... Light source unit, 511 ... Board, 513 ... Parallelizing lens, 514 ... Support member, 514A ... Surface, 52 ... Heat receiving part, 52A ... Surface, 53 ... Heat dissipation part, 54 ... Main body, 541 ... Plate-shaped body, 54A, 54B, 54C, 54D ... End face, 54A1 ... Connection part, 54A2, 54C1, 54D1 ... Discharge part, 54B1 ... Opening part, 54B2 ... Shielding part, 61 ... Afocal optical system (optical component), 62 ... Homogenizer optical system (optical component), 63 ... First phase difference Element (optical component), 64 ... Optical separator (optical component), 65 ... Second phase difference element (optical component), 66 ... First condensing element (optical component), 67 ... Diffusing device (optical component), 68 ... second condensing element (optical component), 69 ... wavelength converter (optical component), 71, 73 ... duct, 72 ... fan, L1, L2 ... dimensions, PM ... photosynthetic member, + X ... direction (third direction) , + Y ... direction (first direction), + Z ... direction (second direction).

Claims (7)

A light source that emits light and
A wavelength conversion element that converts the incident light of the first wavelength into light of a second wavelength different from the first wavelength, and
A housing that houses the wavelength conversion element and
A heat receiving unit that is connected to the light source and receives heat generated by the light source.
A heat radiating section that is connected to the heat receiving section and dissipates heat conducted from the heat receiving section.
A duct connected to the heat radiating portion and through which a cooling gas that has cooled the heat radiating portion flows is provided.
The heat radiating part
A plurality of plates extending along a plane defined by a first direction and a second direction orthogonal to the first direction, and facing each other in a third direction orthogonal to the first direction and the second direction. With the body
A first shielding portion located in a direction opposite to the second direction in the plurality of plate-shaped bodies,
A second shield located in a direction opposite to the second direction in the plurality of plate-shaped bodies and located in a direction opposite to the first direction with respect to the first shield portion in the plurality of plate-shaped bodies. Department and
The first discharge portion located in the second direction in the plurality of plate-shaped bodies,
A second discharge portion located in the second direction in the plurality of plate-shaped bodies and located in a direction opposite to the first discharge portion in the plurality of plate-shaped bodies. Have and
The heat radiating portion is connected to the heat receiving portion in the second direction of the plurality of plate-shaped bodies.
The heat radiating portion has a portion located between the first shielding portion and the second shielding portion in a direction opposite to the second direction of the plurality of plate-shaped bodies, and a portion into which the cooling gas is introduced.
The duct is
The first duct connected to the first discharge part and
It has a second duct connected to the second discharge portion, and has.
A lighting device characterized in that the housing for accommodating the wavelength conversion element is arranged between the first duct and the second duct. In the lighting device according to claim 1,
A diffuser that is housed in the housing and diffuses and reflects the incident light,
It is provided with an optical separator that separates the incident light contained in the housing into light directed toward the wavelength conversion element and light directed toward the diffuser.
A lighting device characterized in that the housing for accommodating the diffusion device and the light separation device is arranged between the first duct and the second duct. In the lighting device according to claim 1 or 2.
A cover member that covers a part of the plurality of plate-like bodies and is connected to the duct is provided.
A lighting device characterized in that the cover member constitutes a part of the duct. In the lighting device according to any one of claims 1 to 3.
The lighting device is characterized by having a confluence portion for merging the cooling gas flowing through the first duct and the cooling gas flowing through the second duct. In the lighting device according to claim 4,
A fan for circulating the cooling gas to the heat radiating portion via the duct is provided.
The lighting device is a fan for exhausting the cooling gas merged at the merging portion. In the lighting device according to any one of claims 1 to 5.
A first light source, which is the light source that emits light along the first emission direction, a first light source device having the heat receiving portion and the heat radiating portion,
A second light source, which is a light source that emits light along a second emission direction intersecting the first emission direction, and a second light source device having the heat receiving portion and the heat radiating portion are provided.
The first duct is connected to the first discharge part of the heat dissipation part of the first light source device and the first discharge part of the heat dissipation part of the second light source device.
The second duct is characterized in that it is connected to the second discharge part of the heat dissipation part of the first light source device and the second discharge part of the heat dissipation part of the second light source device. Lighting device. The lighting device according to any one of claims 1 to 6.
An optical modulation device that modulates the light emitted from the lighting device,
A projector including a projection optical device that projects light modulated by the light modulation device.

Images