JP7107351B2 - Lighting system and projector - Google Patents

Description

The present invention relates to lighting devices and projectors.

Conventionally, a light source device, a light modulation device that modulates light emitted from the light source device to form an image according to image information, and projection optics that enlarges and projects the formed image onto a projection surface such as a screen. A projector comprising an apparatus is known. A light source device used in such a projector combines laser light in a blue wavelength range and light in a red to green wavelength range generated from a fluorescent substance excited by the laser light, and emits white light. A light source device is known (see Patent Document 1, for example).
The light source device described in Patent Document 1 includes a housing, and two light source sections and one phosphor unit held in the housing. Among these, the light source section has one or more solid-state light sources, and the phosphor unit receives light from the light source section 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 section.

JP 2014-238485 A

By the way, a solid-state light source generates heat when it is lit, but its life will be shortened if the high-temperature state continues, so appropriate cooling is necessary.
However, in the light source device described in Patent Literature 1, the heat sink disposed on the rear side (opposite side to the light emitting side) of the light source unit having one or more solid-state light sources has a surface on the rear side of the heat sink. When the cooling gas is sent to the fins, only a part of the cooling gas flows to the light source, and the rest of the cooling gas passes through the fins and is discharged without flowing to the light source. Therefore, there is a problem that the cooling efficiency of the light source section is not high.

SUMMARY OF THE INVENTION It is an object of the present invention to solve at least part of the above problems, and one of the objects of the present invention is to provide a lighting device and a projector that can efficiently cool a light source.

A light source device according to a 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, a heat radiating unit that dissipates heat conducted from the heat receiving unit, and the heat radiating part 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 positioned on the second direction side in the plurality of plate-shaped bodies and connected to the heat receiving portion, and the second direction in the heat radiating portion An opening located at a position corresponding to the connecting part on the opposite direction side, and a shielding part located around the opening on the side opposite to the second direction in the heat radiation part. Characterized by

Examples of such a light source unit include a configuration having a solid-state light source such as an LD (Laser Diode) or an LED (Light Emitting Diode), and a configuration having a light source lamp such as an ultra-high pressure mercury lamp.
According to the first aspect, when the cooling gas flows through the heat radiating section along the second direction, the cooling gas is introduced into the heat radiating section through the opening while being blocked by the shielding section. The cooling gas flows in the second direction between the plurality of plate-shaped bodies, and the openings are located at positions corresponding to the connecting portions 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 that is heated by the heat being conducted from the heat-receiving portion. According to this, the connecting 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 to the connection portion, so that the heat receiving portion and, in turn, the light source portion can be efficiently cooled. Further, since the light source section is cooled in this manner, the service life of the light source section and, by extension, the light source device can be extended.

In the first aspect, it is preferable that the cooling gas, which has flowed into the heat radiating section 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 circulated inside the heat radiating portion through the opening circulates along the second direction, thereby reliably circulating the cooling gas to the connecting portion. be able to. Therefore, the heat receiving section and the light source section can be reliably and efficiently cooled.

In the first aspect, the shielding portion is at least one of a portion on the first direction side and a portion on the opposite direction side to the first direction on the surface of the heat radiating portion opposite to the second direction. is preferably located in
According to such a configuration, the cooling gas that has been introduced into the heat radiating section through the opening and cooled the connection section flows through the plate-shaped bodies in the first direction and the direction opposite to the first direction. It is possible to increase the length of the flow path. Therefore, it is possible to efficiently cool the plurality of plate-like bodies to which heat is conducted from the connecting portion.

In the first aspect, it is preferable that the dimension of the opening in the first direction is equal to or less than the dimension of the connecting part in the first direction.
Here, if the dimension in the first direction of the opening is larger than the dimension in the first direction of the connecting portion through which heat is conducted from the heat receiving portion, cooling gas that does not flow through the connecting portion is likely to be generated. cooling efficiency is reduced.
On the other hand, according to the above configuration, substantially all of the cooling gas introduced from the opening can be reliably circulated to the connecting portion. Therefore, it is possible to increase the flow rate of the cooling gas flowing through the connecting portion, and to further improve the cooling efficiency of the heat receiving portion and the light source portion.

In the first aspect, the heat radiating portion discharges the cooling gas that has flowed through the interior to at least one of the first direction side and the direction opposite to the first direction with respect to the connection portion. It is preferable to have a part.
According to such a configuration, the cooling gas introduced through the opening flows through the connecting portion, passes between the plurality of plate-shaped bodies, and flows in the first direction side of the connecting portion or in the first direction. flows in the opposite direction and is discharged from the discharge section. According to this, the cooling gas that has cooled the connecting portion can be smoothly circulated in at least one of the first direction side and the opposite direction side to the first direction. Therefore, the cooling gas can be reliably circulated between the plate-like bodies, so that the cooling efficiency of the plate-like bodies and the heat-receiving section and the light source section can be improved. In addition, since the cooling gas flows smoothly, the flow velocity of the cooling gas can be increased. Therefore, also in this point, the cooling efficiency of the heat conducted via 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 positioned on the same surface as the connection portion is positioned in the heat dissipation portion.
According to such a configuration, for example, when a duct is connected to the discharge section, it is possible to suppress an increase in the dimension in the first direction of the lighting device including the light source device and the duct.

In the first aspect, it is preferable that the discharge portion is positioned on 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 along the first direction of each plate-like body. Therefore, it is possible to improve the cooling efficiency of each plate-shaped body, and in turn, it is possible to improve the cooling efficiency of the heat receiving section and the light source section.

A lighting device according to a second aspect of the present invention includes: the light source device; a duct through which at least one of a cooling gas that flows through the heat radiating portion and a cooling gas that has cooled the heat radiating portion circulates; and a fan for circulating cooling gas to the heat radiating section, and a plurality of optical components acting on the light emitted from the light source device.
According to the second aspect, the same effects as those of the light source device according to the first aspect can be obtained. Moreover, the cooling gas can be reliably circulated to the heat radiating portion by the fan.

In the second aspect, it is preferable that the two light source devices and a light synthesizing member for synthesizing the light emitted from the two light source devices are provided.
According to such a configuration, light emitted from the two light source devices and combined by the light combining member is emitted from the illumination device. As a result, the amount of emitted light can be increased compared to a lighting device that employs one light source device.

A projector according to a third aspect of the present invention includes the illumination device, a light modulation device that modulates light emitted from the illumination device, and a projection optical device that projects the light modulated by the light modulation device. It is characterized by having
According to the third aspect, the same effects as those 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.

1 is a schematic diagram showing the configuration of a projector according to a first embodiment of the invention; FIG. FIG. 2 is a schematic diagram showing the configuration of the uniform illumination device according to the first embodiment; The perspective view which looked at the light source device in the said 1st Embodiment from the light-projection side. The perspective view which looked at the light source device in the said 1st Embodiment from the opposite side to the light-projection side. FIG. 3 is a perspective view of the light source device and the light source cooling device in the first embodiment as seen from the side opposite to the light emission side. The perspective view which looked at the light source device and the light source cooling device in the said 1st Embodiment from the light-projection side. FIG. 4 is a schematic diagram showing the flow of cooling gas flowing through the heat radiating section and the duct in the first embodiment; The schematic diagram which shows the deformation|transformation of the thermal radiation part in the said 1st Embodiment, and a duct. FIG. 5 is a schematic diagram showing a part of a lighting device included in a projector according to a second embodiment of the invention; The perspective view which shows the light source device and light source cooling device which the illuminating device in the said 2nd Embodiment has. The perspective view which shows the light source device and light source cooling device in the said 2nd Embodiment.

[First embodiment]
A first embodiment of the present invention will be described below with reference to the drawings.
[Schematic configuration of the projector]
FIG. 1 is a schematic diagram showing the configuration of a projector 1 according to this embodiment.
The projector 1 according to the present embodiment modulates light emitted from a uniform illumination device 31, which will be described later, to form an image corresponding to image information, and enlarges and projects the image onto a projection surface PS such as a screen. type display. As shown in FIG. 1 , the projector 1 includes an exterior housing 2 that constitutes an 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 that cools the heating element, a control device that controls the projector 1, and a power supply device that supplies power to the 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 a light source section 51, which will be described later.

[Configuration of image projection device]
The image projection device 3 forms and projects the image. This image projection device 3 comprises a uniform illumination device 31 , a color separation device 32 , a collimating lens 33 , a light modulation device 34 , a color synthesis device 35 and a projection optical device 36 .
Among these, the uniform illumination device 31 emits white illumination light WL that uniformly illuminates the light modulation device 34 . The configuration of the uniform illumination device 31 will be detailed later.

The color separator 32 separates the illumination light WL incident from the uniform illumination device 31 into red, green and blue colored lights LR, LG and LB. The color separation device 32 includes dichroic mirrors 321, 322, reflecting mirrors 323, 324, 325, relay lenses 326, 327, and an optical component housing 328 that accommodates these.
A dichroic mirror 321 separates blue light LB and other color lights (green light LG and red light LR) from the illumination light WL. The separated blue light LB is reflected by the reflecting mirror 323 and guided to the collimating lens 33 (33B).
The dichroic mirror 322 separates the green light LG and the red light LR from the separated other color lights. The separated green light LG is guided to the collimating lens 33 (33G). Also, the separated red light LR is guided to the collimating lens 33 (33R) via the relay lens 326, the reflecting mirror 324, the relay lens 327 and the reflecting mirror 325.
Note that the collimating lens 33 (collimating lenses for red, green, and blue lights are 33R, 33G, and 33B, respectively) collimates the incident light.

The light modulation device 34 (the light modulation devices for red, green and blue lights are respectively 34R, 34G and 34B) modulates the incident color lights LR, LG and LB to obtain image information. Image light is formed by the corresponding color lights LR, LG, and LB. Each of these light modulators 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 exit side of the liquid crystal panel.

The color synthesizing device 35 synthesizes the image light of each color light LR, LG, LB incident from each of the light modulating devices 34R, 34G, 34B. Such a color synthesizing device 35 is composed of a cross dichroic prism in this embodiment.
The projection optical device 36 enlarges and projects the image light synthesized by the color synthesizing device 35 onto the projection surface PS. As such a projection optical device 36, for example, a lens combination configured by a lens barrel and a plurality of lenses arranged in the lens barrel can be employed.

[Configuration of Uniform Illumination Device]
FIG. 2 is a schematic diagram showing the configuration of the uniform illumination device 31. As shown in FIG.
The uniform illumination device 31 emits white illumination light WL toward the color separation device 32 as described above. As shown in FIG. 2, the uniform illumination device 31 includes an illumination device 4 and a homogenization device 8. The illumination device 4 includes a light source device 5, an illumination light generation device 6, and a light source cooling device 7 (see FIG. 2), which will be described later. 5 and FIG. 6).

[Configuration of light source device]
The light source device 5 has a light source section 51 that emits excitation light.
The light source unit 51 has a substrate 511, a plurality of solid-state light sources 512 which are LDs (Laser Diodes) arranged on the substrate 511, and a collimating lens 513 provided for each solid-state light source 512, The excitation light, which is blue light, is emitted toward the illumination light generation device 6 . In this embodiment, the solid-state light source 512 is an LD that emits excitation light with a peak wavelength of 440 nm. LDs each emitting excitation light of 446 nm may be mixed. The excitation light emitted from these solid-state light sources 512 is collimated by a collimating lens 513 and enters the illumination light generation device 6 . In this 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 portion 52 connected to the substrate 511 and a heat radiating portion 53 connected to the heat receiving portion 52 . These will be detailed later.

[Configuration of Illumination Light Generation Device]
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 generating device 6 includes an afocal optical system 61, a homogenizer optical system 62, a first phase difference element 63, a light separation device 64, a second phase difference element 65, a first collector, and an afocal optical system 61 corresponding to the optical components of the present invention. It comprises 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, the afocal optical system 61, the homogenizer optical system 62, the first phase difference element 63, the second phase difference element 65, the first condensing element 66, and the diffusion device 67 are It is arranged on the illumination optical axis Ax1. Also, the second light collecting element 68 and the wavelength conversion device 69 are arranged on the illumination optical axis Ax2 orthogonal to the illumination optical axis Ax1. The light separating 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 beam diameter of the excitation light incident from the light source section 51 . This 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 homogenizes the illuminance distribution of the excitation light in the regions to be illuminated of the diffusion device 67 and the wavelength conversion device 69 in cooperation with light collecting elements 66 and 68, which will be described later. The homogenizer optical system 62 includes a pair of multi-lens arrays 621 and 622 each having a plurality of small lenses arranged in a matrix in a plane perpendicular to the optical axis. The excitation light emitted from this homogenizer optical system 62 is incident on the first phase difference element 63 .
The first retardation element 63 is a half-wave plate. The first phase difference element 63 converts part of the incident S-polarized excitation 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 light separating device 64 .

The light splitting device 64 is a prism-type PBS (Polarizing Beam Splitter), in which prisms 641 and 642 each having a substantially triangular prism shape are bonded together at an interface corresponding to the oblique side, thereby forming a substantially rectangular parallelepiped shape. there is This interface is inclined at 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 on the interface of the prism 641 located on the first retardation element 63 side (that is, the light source section 51 side) in the light separation device 64 .
The polarization splitting layer 643 has wavelength-selective polarization splitting properties. Specifically, the polarization separation layer 643 has a property of reflecting one of S-polarized light and P-polarized light contained in the excitation light and transmitting the other to separate these polarized lights. In addition, the polarization separation layer 643 has a characteristic 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 a light separation device 64, in the present embodiment, of the excitation light incident from the first phase difference element 63, the P-polarized light is transmitted to the second phase difference element 65 along the illumination optical axis Ax1. , and the S-polarized light is reflected toward the second condensing element 68 along the illumination optical axis Ax2.

The second phase difference element 65 is a quarter-wave plate, converts the excitation light (linearly polarized light) incident from the light separation device 64 into circularly polarized light, and converts the excitation light (linearly polarized light) incident from the first light collecting element 66 Circularly polarized light) into linearly polarized light.
The first condensing element 66 is an optical element that converges (converges) the excitation light that has passed through the second phase difference element 65 onto the diffusing device 67, and is composed of three lenses in this embodiment. However, the number of lenses forming the first condensing element 66 is not limited to three.
The diffusion device 67 diffusely reflects the incident excitation light at the same diffusion angle as the fluorescent light generated and emitted by the wavelength conversion device 69 . The diffusing device 67 has, although not shown, a reflecting plate that Lambertianly reflects incident light and a rotating device that rotates and cools the reflecting plate.

The excitation light diffusely reflected by the diffusion device 67 is incident on the second phase difference element 65 again through the first light collecting element 66 . When reflected by the diffuser 67, the circularly polarized light incident on the diffuser 67 becomes circularly polarized in the opposite direction. It is converted into S-polarized excitation light whose polarization direction is rotated by 90° with respect to the polarized excitation light. The excitation light is then reflected by the polarization splitting layer 643 and enters the uniformizing device 8 as blue light along the illumination optical axis Ax2. That is, the excitation light diffusely reflected by the diffusion device 67 is emitted in the direction of the illumination optical axis Ax2 by the light separation device 64 .

The second condensing element 68 and the wavelength conversion device 69 are arranged on the illumination optical axis Ax2 as described above.
The second condensing element 68 converges the excitation light of the S-polarized light incident from the first phase difference element 63 via the polarization splitting layer 643 onto the wavelength conversion device 69 . In this embodiment, the second light collecting element 68 is configured as a lens group having three lenses, like the first light collecting element 66, but the number of lenses is not limited.

The wavelength conversion device 69 converts incident excitation light into fluorescence light. This wavelength conversion device 69 comprises a wavelength conversion element 691 and a rotation device 695 .
Of these, the rotating device 695 is composed of a motor or the like that rotates the wavelength conversion element 691 about its central axis.

The wavelength conversion element 691 has a substrate 692, and a phosphor layer 693 and a reflective layer 694 located on the surface of the substrate 692 on the excitation light incident side.
The substrate 692 is formed in a substantially circular shape when viewed from the incident side of the excitation light. This substrate 692 can be made of metal, ceramics, or the like.
The phosphor layer 693 is a wavelength conversion layer containing a phosphor that is excited by 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 portion of the fluorescent light generated in the phosphor layer 693 is emitted toward the second light condensing element 68 side, and the other portion is emitted toward the reflective layer 694 side.
The reflective layer 694 is disposed between the phosphor layer 693 and the substrate 692 and reflects the fluorescent light incident from the phosphor layer 693 to the second light collecting element 68 side.
Fluorescent light emitted from such a wavelength conversion element 691 is non-polarized light. This fluorescent light is incident on the polarization separation layer 643 of the light separation device 64 via the second light condensing element 68, passes through the polarization separation layer 643 along the illumination optical axis Ax2, and enters the homogenization device 8. be.

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 is transmitted through the second phase difference element 65 and diffused by the diffusion device 67. After being reflected, the light is converted into S-polarized light by passing through the second phase difference element 65 again, and is reflected by the light separating device 64 toward the uniformizing device 8 side.
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 wavelength-converted into fluorescent light by the wavelength conversion device 69, and then transmitted through the light separation device 64 to be uniform. is emitted to the conversion device 8 side.
That is, the blue light and fluorescent light (light including green light and red light), which are part of the excitation light, are synthesized by the light separation device 64 and are incident on the homogenization device 8 as white illumination light WL. be. Therefore, the light separating device 64 can also be called a light combining device.

[Construction of homogenization device]
The homogenizing device 8 homogenizes the illuminance in the plane perpendicular to the optical axis of the light incident on each light modulating device 34 (34R, 34G, 34B), which is the area to be illuminated by the uniform illuminating device 31, and also changes the polarization direction. It has an alignment function. The homogenizing device 8 comprises a first lens array 81, a second lens array 82, a polarization conversion element 83 and a superimposing lens 84, each arranged on the illumination optical axis Ax2.
The first lens array 81 has a configuration in which first lenses 811 are arranged in a matrix in a plane perpendicular to the illumination optical axis Ax2, and divides the incident illumination light WL into a plurality of partial light fluxes.
The second lens array 82 has a configuration in which second lenses 821 corresponding to the first lenses 811 are arranged in a matrix in a plane perpendicular to the illumination optical axis Ax2. The second lens array 82 superimposes the plurality of partial light beams split by each first lens 811 on each light modulator 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 light beams. The illumination light WL formed by a plurality of partial light beams whose polarization directions are aligned by the polarization conversion element 83 is incident on the color separation device 32 via the superimposing lens 84 .

[Configuration of light source device]
FIG. 3 is a perspective view showing the light source device 5 viewed from the light emitting side. In FIG. 3, the illustration of the cover member 55 constituting the heat radiating section 53 is omitted, and only the collimating lens 513 and part of the accommodating section 5141 are denoted by reference numerals for ease of viewing.
The light source device 5 includes the light source section 51, a heat receiving section 52 connected to the support member 514 of the light source section 51, and a heat dissipation section 53 connected to the heat receiving section 52, as shown in FIG.

[Configuration of light source]
The light source unit 51 has the substrate 511, the solid-state light source 512, and the collimating lens 513, and further has a support member 514 for supporting them.
The support member 514 is formed in a substantially rectangular parallelepiped shape and has a plurality of housing portions 5141 which are substantially cylindrical holes in which one solid-state light source 512 (not shown in FIG. 3) and one collimating lens 513 are respectively housed. These accommodating portions 5141 are arranged along the longitudinal direction and the lateral direction on a rectangular surface 514A orthogonal to the illumination optical axis Ax1 of the support member 514. The solid-state light source 512 and the collimating lens 513 housed in are arranged in a matrix on a plane perpendicular to the illumination optical axis Ax1.
In addition, the substrate 511 is arranged on the support member 514 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 metal having thermal conductivity. Therefore, the support member 514 has the function of stably supporting the substrate 511, the solid-state light source 512, and the collimating lens 513, and also dissipates the heat conducted by coming into contact with them, and transfers the heat to the heat receiving portion 52. It also has the 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 two directions orthogonal to the +Z direction are the +X direction and the +Y direction. Of these +X direction and +Y direction, the +X direction is defined as one direction along the longitudinal direction of the surface 514A, and the +Y direction is defined as one direction along the lateral direction of the surface 514A. More specifically, when the surface 514A is viewed 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 the direction from the bottom to the top is the +X direction. The facing direction is the +Y direction. Note that even when the surface 514A has a shape other than a rectangle, or when the solid-state light source 512 and the collimating lens 513 are randomly arranged, one of the two directions that are orthogonal to the +Z direction and are orthogonal to each other is +X direction and the other +Y direction.
The direction opposite to the +Z direction is the -Z direction. The same applies to the -X direction and -Y direction.
The +Y direction corresponds to the first direction of the invention, the +Z direction corresponds to the second direction of the invention, and the +X direction corresponds to the third direction of the invention.

[Configuration of heat receiving part]
The heat receiving part 52 is a substantially rectangular parallelepiped plate-like member made of a material having thermal conductivity (for example, metal), and is formed larger than the support member 514 in +X direction and +Y direction. Approximately in the center of the +Z direction side surface 52A of the heat receiving portion 52, the −Z direction side surface (surface 514A ) are connected in a heat-conducting manner. Thereby, the heat generated in the light source section 51 is conducted to the heat receiving section 52 via the support member 514 .

[Configuration of heat sink]
FIG. 4 is a perspective view showing the light source device 5 viewed from the side opposite to the light emitting side. In FIG. 4 as well, the illustration of the cover member 55 constituting the heat radiating portion 53 is omitted.
The heat radiating portion 53 is connected to the heat receiving portion 52 so as to be capable of conducting heat, and radiates the heat conducted from the heat receiving portion 52 to a cooling gas that is circulated by driving the fan 72, which will be described later. , cools the light source unit 51 .
As shown in FIGS. 3 and 4, the heat dissipation portion 53 includes a body portion 54 and a cover member 55 (see FIGS. 5 and 6) that connects the body portion 54 to a duct 71 of the light source cooling device 7, which will be described later. , has

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

The shielding portion 54B2 is positioned around the opening portion 54B1 on the end surface 54B, shields part of the cooling gas flowing along the +Z direction from the −Z direction side, and passes the cooling gas through the opening portion 54B1. It is guided into the body portion 54 . In this 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 between the +Y direction side and the −Y direction side. there is When the heat radiating portion 53 (body portion 54) is viewed from the -Z direction side, if the center position of the opening portion 54B1 deviates from the center position of the body portion 54 in the +Y direction side or the -Y direction side, , the dimension of each shielding portion 54B2 in the +Y direction is also changed according to the center position of the opening 54B1.
Such a shielding portion 54B2 is formed by attaching a flat member to the end surface 54B in this embodiment. However, it is not limited to this, and may be formed by bending the ends of the plate-like bodies 541 on the -Z direction side in the same direction (for example, the +X direction).

As shown in FIGS. 3 and 4, the main body 54 has a +Z direction side end face 54A (an end face 54A connecting the +Z direction side ends of the plurality of plate-like bodies 541) with a connection portion 54A1 and a discharge port 54A. It has a portion 54A2.
The connecting portion 54A1 is a portion to which the end surface of the heat receiving portion 52 on the -Z direction side is connected so as to be capable of conducting heat, and in this embodiment, is positioned substantially at the center of the end surface 54A in the +Y direction. The dimension of the connection portion 54A1 in the +Y direction substantially matches the dimension of the heat receiving portion 52 in the +Y direction. Such a connecting portion 54A1 may be configured by attaching a flat plate-like member like the shielding portion 54B2, or may be configured by bending each plate-like member 541, and nothing is added or processed. It may be a part.

The discharge portion 54A2 is located at a portion other than the connection portion 54A1 on the end surface 54A, and in this embodiment, two discharge portions are provided so as to sandwich the connection portion 54A1. These discharge portions 54A2 are portions where the gaps between the plate-like members 541 along the +Y direction are exposed to the outside. This is the part that discharges the gas. These discharge portions 54A2 are arranged to face an inlet port of the duct 71, which will be described later, and the cooling gas discharged via the discharge portion 54A2 is introduced into the duct 71 via the inlet port.
In the present embodiment, gaps between the plate-like members 541 are exposed on the +Y direction end face 54C and the -Y direction end face 54D 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 end faces 54C and 54D are not limited to this, and may be closed by attachment of a flat plate-like member, bending of the plate-like body 541, or the like.

[Structure of cover member]
5 and 6 are perspective views showing the light source device 5 and the light source cooling device 7. FIG. Among them, FIG. 5 is a perspective view of the light source device 5 and the light source cooling device 7 viewed from the opposite side (−Z direction side) of the light emitting side of the light source device 5, and FIG. and a perspective view of the light source cooling device 7 as seen from the light emitting side (+Z direction side).
As shown in FIGS. 5 and 6, the cover member 55 covers the body portion 54 connected to the light source portion 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 is formed with an opening 551 having the same shape and dimensions as the opening 54B1 at a position corresponding to the opening 54B1. In the cover member 55, a 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 a portion other than the opening 551. ing. Therefore, the portion other than the opening 551 can be said to be a shielding portion of the cover member 55 .

A concave portion 552 is formed at a position on the +Z direction side in 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 concave portion 552 . Therefore, part of the heat conducted to the heat receiving portion 52 is directly conducted to the cover member 55 and radiated. Part of the generated heat is also radiated by the cover member 55 .

In addition, the cover member 55 has a connection portion 553 connected to the first duct portion 711 of the duct 71 and a second duct portion at positions sandwiching the light source portion 51 and the heat receiving portion 52 on the +Z direction side end face. 712 and has a connection portion 554 . Although not shown, these connection portions 553 and 554 are provided with openings at positions corresponding to the discharge portions 54A2. The heat is discharged to the outside of the heat radiating portion 53 through the heat radiating portion 53 .

[Configuration of Light Source Cooling Device]
The light source cooling device 7 is connected to the heat radiating portion 53 of the light source device 5 as described above, and circulates the cooling gas to the heat radiating portion 53 to cool the heat radiating portion 53 and, in turn, the heat receiving portion 52 and the light source portion 51. do. This light source cooling device 7 has a duct 71 and a fan 72, as shown in FIGS.
The duct 71 includes a first duct portion 711 and a second duct portion 712 extending along the +Z direction, and connecting the duct portions 711 and 712 to flow the cooling gas flowing through the duct portions 711 and 712. A merging portion 713 for merging is provided, and by these, it is formed in a substantially horizontal U shape when viewed from the -X direction side. In the space SP between the first duct portion 711 and the second duct portion 712, a housing (not shown) that houses the illumination light generating device 6 or a housing 328 for optical components of the color separation device 32 is provided. part of is placed.

The end of the first duct portion 711 opposite to the confluence portion 713 (the end in the −Z direction) is configured as a connection portion 7111 to which the connection portion 553 is connected. The end on the side opposite to 713 (the end 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, these connection portions 7111 and 7121 introduce the cooling gas discharged from the heat radiating portion 53 through the discharge portion 54A2 and the opening into the respective duct portions 711 and 712. Introductory ports 7112 and 7122 (see FIG. 7) are formed.

The merging portion 713 merges the cooling gas that has flowed through the duct portions 711 and 712 and discharges it to the outside of the duct 71 . An exhaust port 7131 for discharging the cooling gas is formed at the +Z direction side end of the confluence portion 713 , and a fan 72 is arranged in the exhaust port 7131 .
The fan 72 sucks the cooling gas introduced into the heat radiating section 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 diagram showing the flow of cooling gas flowing through the heat radiating section 53 and the duct 71 when the fan 72 is driven. 7, illustration of the cover member 55 is omitted.
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, the body portion 54 through the openings 551 and 54B1. The cooling gas F travels in the +Z direction through the gaps between the plate-like bodies 541 and reaches the connection portion 54A1 that is positioned in the +Z direction with respect to the opening portion 54B1 and connected to the heat receiving portion 52 .

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

After that, the cooling gas F that has flowed to the part S is further sucked by the fan 72, a part of the cooling gas F1 flows between the plate-like bodies 541 in the +Y direction, and the other cooling gas F2 flows through the plate-like bodies 541 in the -Y direction. At this time, the heat conducted to the plate-like body 541 is conducted to the cooling gases F1 and F2, thereby cooling the plate-like body 541 and, by extension, the main body 54 .
The cooling gas F1 that has flowed through the plate-like bodies 541 in the +Y direction in the body portion 54 is introduced into the first duct portion 711 via the discharge portion 54A2 and the connection portion 553 . Similarly, the cooling gas F2 that has flowed through the plate-like members 541 in the −Y direction inside the main body 54 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 flow through the duct portions 711 and 712 in the +Z direction, reach the confluence portion 713, and pass through the exhaust port 7131 of the confluence portion 713. It is discharged by fan 72 .
Thus, the light source device 5 is cooled.

[Effect of the first embodiment]
The projector 1 according to the present embodiment described above has the following effects.
An end surface 54B on the −Z direction side of the body portion 54 of the heat radiating portion 53 shields the cooling gas flowing through the end surface 54B and introduces the cooling gas into the body portion 54 only through the opening 54B1. 54B2 are positioned around the opening 54B1. Further, the opening 54B1 is located at a position corresponding to the connecting portion 54A1 to 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 in the shortest distance to the connecting portion 54A1 which becomes hot. Therefore, the connection portion 54A1 can be efficiently cooled, and the heat receiving portion 52 and, by extension, the light source portion 51 can be efficiently cooled.

As described above, the cooling gas that has flowed through the openings 551 and 54B1 inside the heat radiating section 53 (main body section 54) flows between the plurality of plate-like bodies 541 along the +Z direction. According to this, as described above, the cooling gas can be reliably circulated to the connection portion 54A1 located on the +Z direction side with respect to the opening portion 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.

On the end face 54B on the −Z direction side of the body portion 54, the shielding portion 54B2 is positioned on the +Y direction side and the −Y direction side so as to sandwich the opening portion 54B1. According to this, it is possible to lengthen the flow path in which the cooling gas introduced through the opening 54B1 flows along between the plate-like members 541 in the +Y direction and the -Y direction. Therefore, it is possible to efficiently cool the plurality of plate-like bodies 541 to which heat is conducted from the connecting portion 54A1.

Here, if the dimension of the opening 54B1 in the +Y direction is larger than the dimension in the +Y direction of the connecting portion 54A1 through which heat is conducted from the heat receiving portion 52, cooling gas that does not flow through the connecting portion 54A1 is likely to be generated. The cooling efficiency of the connection portion 54A1 is lowered. On the other hand, the dimension L1 in the +Y direction of the opening 54B1 is smaller than the dimension L2 in the +Y direction of the connection portion 54A1, which substantially matches the dimension of the heat receiving portion 52 in the +Y direction. According to this, substantially 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 connection portion 54A1, and thus the heat receiving portion 52 and the light source portion 51 can be further enhanced.

The body portion 54 constituting the heat radiating portion 53 has discharge portions 54A2 for discharging the cooling gas flowing through the connection portion 54A1 to 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 smoothly circulated in the +Y direction side and the −Y direction side. Therefore, the cooling gas can be reliably circulated along the plate-like body 541 , so that the cooling efficiency of the plate-like body 541 and thus the heat receiving section 52 and the light source section 51 can be improved. In addition, since the cooling gas is smoothly circulated and discharged in this manner, the flow velocity of the cooling gas can be increased. In this respect as well, the cooling efficiency of the heat conducted via the connection portion 54A1 can be improved. Furthermore, the cooling efficiency of the heat receiving section 52 and the light source section 51 can be improved.

The discharge portion 54A2 is located on the same end surface 54A as the connecting portion 54A1 in the body portion 54 of the heat radiating portion 53 . According to this, it is possible to suppress an increase in 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 portion 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 body portion 54 of the heat radiating portion 53 has the discharge portion 54A2 on the +Y direction side and the −Y direction side of the end surface 54A on the +Z direction side, and the heat radiating portion 53 has a cover. It was connected to the first duct portion 711 and the second duct portion 712 at the connection portions 553 and 554 located on the +Y direction side and the −Y direction side on the end face of the member 55 on the +Z direction side. However, the connection position between the heat radiating portion 53 and the duct 71 is not limited to this, and may be another position.

FIG. 8 is a schematic diagram showing deformation of the heat radiating portion 53 and the duct 71. As shown in FIG.
For example, the discharge direction of the cooling gas from the heat radiating portion 53 may be the +Y direction and the -Y direction instead of the +Z direction, as shown in FIG. In this case, the portion of the end surface 54A of the main body 54 where the discharge portion 54A2 is set is closed, the end surfaces 54C and 54D are opened, and the discharge portions 54C1 and 54D1 for discharging the cooling gas to the end surfaces 54C and 54D are closed. set. Similarly, in the cover member 55 that covers the main body 54, connection portions 555 and 556 similar to the connection portions 553 and 554 connected to the duct 71 are set at positions corresponding to the discharge 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 of the first duct portion 711 on the −Z direction side and on the −Y direction side, and the second duct portion A connecting portion 7121 of the second duct portion 712 is set in the vicinity of the end portion of the second duct portion 712 on the −Z direction side and on the +Y direction side.

When the heat radiating portion 53 is connected to the duct 71 so that the connection portions 7111 and 7121 face the discharge portions 54C1 and 54D1, and the fan 72 is driven, the body portion of the heat radiating portion 53 is driven in the same manner as described above. The cooling gas F introduced into 54 travels in the +Z direction through the gaps between the plate-like bodies 541 and reaches the site S of 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 set on the end face 54C on the +Y direction side of the body portion 54 and the connection portions 555 and 7111. , flow into the first duct portion 711 . In addition, another cooling gas F2 flows between the plates 541 in the -Y direction, and passes through the discharge portion 54D1 set on the end surface 54D on the -Y direction side of the main body 54 and the connecting portions 556 and 7121. , into the second duct portion 712 . The cooling gases F1 and F2 introduced into these duct portions 711 and 712 flow through the duct portions 711 and 712 in the +Z direction, respectively, and pass through the exhaust port 7131 of the confluence portion 713 to the fan 72 in the same manner as described above. discharged by

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

[Second embodiment]
Next, a second embodiment of the invention will be described.
The projector according to the present embodiment has a configuration similar to that of the projector 1 described above, but is different from the projector 1 in that two light source devices 5 are provided and these two light source devices 5 are connected to one duct. differ. In the following description, the same or substantially the same parts as those already described are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 9 is a schematic diagram showing a part of the illumination device 4A included in the projector according to this embodiment. 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. Furthermore, FIG. 11 is a perspective view showing the light source devices 5A and 5B and the light source cooling device 7A with the cover member 55 removed from the state shown in FIG.
The projector according to this embodiment has the same configuration and functions as the projector 1 described above, except that it has an illumination device 4A instead of the illumination device 4. FIG.
9, the illumination device 4A includes two light source devices 5 (5A, 5B) and a light combining member PM, and further, instead of the light source cooling device 7, as shown in FIGS. It has the same configuration and functions as those of the lighting device 4 except that it includes a light source cooling device 7A.

[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. FIG.
Similar to the duct 71, the duct 73 connects a first duct portion 731 and a second duct portion 732 extending along the +Z direction, and connects the duct portions 731 and 732 on the +Z direction side. and a confluence portion 713 that merges and discharges the cooling gas that has flowed through the portions 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 connected to the connection portions 553 and 554 of the light source device 5A in the same manner as the duct portions 711 and 712. are configured as connecting portions 7311 and 7321 connected to the .
In addition, on the +X direction side end surfaces of the duct portions 731 and 732, the -Z direction side portions are connected to the connection portions 553 and 554 of the light source device 5B. provided to protrude.
As shown in FIG. 10, introduction ports 7312 and 7322 are formed in these connection portions 7311 and 7321 at positions facing the discharge portion 54A2 of the light source device 5A. Inlet ports 7314 and 7324 are formed at positions facing the portion 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 light combining member PM is arranged so as to face each of the light source devices 5A and 4B. One of the light source devices 5A and 5B is arranged on the illumination optical axis Ax1.
This light combining member PM transmits the excitation light emitted from one of the light source devices 5A and 5B along the illumination optical axis Ax1, and passes the excitation light emitted from the other light source device along the illumination optical axis Ax1. These excitation lights are combined by reflecting them along the . The excitation light that has passed through the light combining member PM is incident on the afocal optical system 61 .

[Cooling gas flow]
In the light source cooling device 7A shown in FIGS. 10 and 11, when the fan 72 positioned in the merging portion 713 is driven, the cooling gas flows through the openings 551 and 54B1 of the light source devices 5A and 5B into the heat radiating portion 53. flowed inside. As described above, this cooling gas flows between the plate-like members 541 of the main body 54 and reaches the site S of the connecting portion 54A1 connected to the heat receiving portion 52. The other cooling gas flows in the -Y direction.
The cooling gas circulated in the +Y direction in the light source device 5A flows into the first duct portion 731 via the discharge portion 54A2 and the connection portions 553 and 7311, and the cooling gas circulated in the -Y direction flows into the discharge portion. It flows into the second duct portion 732 via 54A2 and the connection portions 554 and 7321 .
The cooling gas circulated in the +Y direction in the light source device 5B flows into the first duct portion 731 via the discharge portion 54A2 and the connection portions 553 and 7313, and the cooling gas circulated in the -Y direction flows into the discharge portion. It flows into the second duct portion 732 via 54A2 and the connection portions 554 and 7323 .
The cooling gas that has flowed into these duct portions 731 and 732 joins at the joining portion 713 and is discharged to the outside through the exhaust port 7131 by the fan 72 .

[Effect of Second Embodiment]
According to the projector according to the present embodiment described above, in addition to the effects similar to those of the projector 1, the following effects can be achieved.
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. be. The plate-like body 541 of the light source device 5A extends along the YZ plane, and the plate-like body 541 of the light source device 5B extends along the XY plane. That is, even if the plate-like body 541 of each of the light source devices 5A and 5B is extended in the +Y direction or the -Y direction, it does not interfere with each of the light source devices 5A and 5B. According to this, the light source devices 5A and 5B can be arranged close to each other so that the plate-like bodies 541 of the light source devices 5A and 5B do not interfere with each other. Therefore, it is possible to suppress an increase in size of the illumination device 4A due to the provision of the two light source devices 5A and 5B.

The illumination device 4A has the light source devices 5A and 5B and a light combining member PM that combines 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 emitted light can be increased compared to the illumination device 4 having one light source device 5. Therefore, an image with higher brightness can be formed and projected.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiments, but includes modifications, improvements, and the like within the scope of achieving the object of the present invention.
The heat radiation part 53 has a body part 54 that is a heat sink, and a cover member 55 that covers the body part 54 and attaches the body part 54 to the ducts 71 and 73 . However, the present invention is not limited to this. For example, if the body portion 54 can be directly attached to the ducts 71, 73, etc., the cover member 55 may be omitted. In this case, for example, when connecting the heat radiating portion 53 (main body portion 54) so that the discharge portion 54A2 and the connecting portions 7111, 7121, 7311, 7313, 7321, 7323 of the ducts 71, 73 face each other, The end surfaces 54C and 54D of the body portion 54 may be closed.

When the heat radiating portion 53 is viewed from the −Z direction side, the opening portion 54B1 is positioned substantially at the center of the end face 54B in the +Y direction, and the shielding portion 54B2 is positioned so as to sandwich the opening portion 54B1 between the +Y direction side and the −Y direction side. It was supposed to be placed in Also, the opening 551 is formed according to the opening 54B1. However, the present invention is not limited to this. In other words, the positions of the openings 54B1 and 551 may be any position within the -Z direction plane of the main body 54 and the cover member 55, and the shielding part 54B2 may also be positioned around the opening 54B1. , in any position. It should be noted that the term "periphery" as used herein indicates a position connected to the edge of the opening 54B1, and does not necessarily surround the opening 54B1. Further, as described above, when the shielding portions 54B2 are positioned on the +Y direction side and the −Y direction side with respect to the opening portion 54B1, the dimensions of the shielding portions 54B2 in the +Y direction may be different from each other or may be the same. good.

It is assumed that 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, if the cooling gas introduced into the body portion 54 through the opening 54B1 can flow through the connection portion 54A1 (especially the portion S), the dimension L1 may be the same as the dimension L2. can be larger. Further, when the fan discharges the cooling gas to the heat radiating portion 53 (body portion 54), the flow direction of the cooling gas to the heat radiating portion 53 is the +Y direction side or the −Y direction side with respect to the +Z direction, or , the +X direction side or the −X direction side, the position of the opening 54B1 may be shifted with respect to the connecting portion 54A1 in the circulation direction of the cooling gas.

The cooling gas that has been introduced into the main body 54 and circulated through the connection portion 54A1 passes through the discharge portion 54A2 or the discharge portions 54C1 and 54D1 located on the +Y direction side and the -Y direction side with respect to the connection portion 54A1. 54 was assumed to be discharged outside. However, the present invention is not limited to this. For example, only one of the ejection portions 54A2, 54C1, and 54D1 may be provided in the main body portion 54. FIG. In this case, the opening portion 54B1 may be configured to be positioned on the end portion side opposite to the one discharge portion in the end face 54B. Further, if the duct is connected to end face 54B, the outlet may be located at end face 54B. That is, the discharge portion can be anywhere on the body portion 54 .

It is assumed that the ducts 71 and 73 connected to the light source device 5 are formed in a substantially horizontal U-shape as described above. However, the present invention is not limited to this. For example, it can be changed as appropriate according to the position and number of the discharge portions 54A2. Further, the ducts connected to the openings 551 and 54B1 for guiding the cooling gas and the fan for sending the cooling gas into the ducts 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 employed in addition. In addition, without providing the ducts 71 and 73 themselves, the inner surface of the exterior housing 2 of the projector 1, the outer surface of the housing (not shown) that accommodates the illumination light generation device 6, or the outer surface of the optical component housing 328 A cooling gas flow path for cooling the light source device 5 may be formed in the space between the .

It is assumed that the projector 1 includes three light modulators 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 also be applied to a projector using two or less light modulation devices or four or more light modulation devices.
Further, the light modulation device 34 uses a transmissive liquid crystal panel having different luminous flux incidence surfaces and luminous flux exit surfaces. good. In addition, as long as it is a light modulation device capable of forming an image according to image information by modulating an incident light beam, a device using a micromirror, such as a device using a DMD (Digital Micromirror Device), etc., may be used other than the liquid crystal. A light modulator may also be used.
Furthermore, the arrangement of each optical component constituting the image projection device 3 is not limited to the arrangement shown in FIGS.

In each of the above embodiments, the light source device 5 includes the light source section 51 having the solid-state light source 512, which is an LD. However, the present invention is not limited to this. For example, a light source section having other solid-state light sources such as LEDs may be employed, or a light source section having a light source lamp may be employed.
Further, in each of the above-described embodiments, the optical components constituting the illumination devices 4 and 4A include the afocal optical system 61, the homogenizer optical system 62, the first phase difference element 63, the light separation device 64, the second phase difference element 65, A first light collecting element 66, a diffuser 67, a second light collecting element 68 and a 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 application of the illumination device having the light source device 5 .
Furthermore, in each of the above-described embodiments, an example in which the light source device 5 and the illumination devices 4 and 4A of the present invention are applied to the projector 1 has been shown. 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 fixtures, headlights of automobiles, and the like.

DESCRIPTION OF SYMBOLS 1... Projector 34 (34B, 34G, 34R)... Optical modulation apparatus 36... Projection optical apparatus 4, 4A... Illumination apparatus 5 (5A, 5B)... Light source apparatus 51... Light source part 511... Substrate 513 Parallelizing lens 514 Support member 514A Surface 52 Heat receiving part 52A Surface 53 Heat dissipation part 54 Main body 541 Plate 54A, 54B, 54C, 54D End surface 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 Elements (optical parts), 64... Light separating device (optical parts), 65... Second phase difference element (optical parts), 66... First condensing element (optical parts), 67... Diffusion device (optical parts), 68 ... second light collecting element (optical component), 69 ... wavelength conversion device (optical component), 71, 73 ... duct, 72 ... fan, L1, L2 ... dimension, PM ... light combining member, +X ... direction (third direction) , +Y direction (first direction), +Z direction (second direction).

Claims (7)

a light source that emits light;
a heat receiving unit that is connected to the light source and receives heat generated by the light source;
A plurality of plate-shaped plates extending along a plane defined by a first direction and a second direction orthogonal to the first direction and arranged to face each other in a third direction orthogonal to the first direction and the second direction a heat radiating section configured by a body , connected to the heat receiving section, and configured to radiate heat conducted from the heat receiving section;
a duct connected to the heat radiating part and through which a cooling gas that has cooled the heat radiating part flows;
The heat dissipation part is
a first extension portion extending in the first direction from a region connected to the heat receiving portion, and a second extension portion extending from the region in a direction opposite to the first direction;
In the first extension portion , the first shield portion is arranged in the second direction from the heat receiving portion to the heat dissipation portion ; a second shielding portion spaced apart from the first shielding portion;
an introducing portion provided between the first shielding portion and the second shielding portion in the heat radiating portion in the second direction for introducing the cooling gas into the heat radiating portion ;
The duct is
a first duct connected to the first extension and through which the cooling gas that has flowed through the first extension flows ;
and a second duct that is connected to the second extension and through which the cooling gas that has circulated through the second extension circulates . The lighting device according to claim 1,
a wavelength conversion element that converts incident light of a first wavelength into light of a second wavelength different from the first wavelength;
a housing that accommodates the wavelength conversion element,
The illumination device, wherein the housing that houses the wavelength conversion element is arranged between the first duct and the second duct. The lighting device according to claim 2,
a diffusion device that is housed in the housing and diffusely reflects incident light;
a light separation device that is housed in the housing and separates incident light into light directed toward the wavelength conversion element and light directed toward the diffusion device;
The lighting device according to claim 1, wherein the housing housing the diffusion device and the light separation device is arranged between the first duct and the second duct. In the lighting device according to any one of claims 1 to 3,
A cover member that covers a part of the heat radiating part and is connected to the duct,
The lighting device, wherein the cover member constitutes a part of the duct. In the lighting device according to any one of claims 1 to 4,
a first light source device including a first light source that emits light along a first emission direction, the heat receiving section, and the heat dissipating section;
a second light source that is the light source that emits light along a second emission direction that intersects with the first emission direction, a second light source device that includes the heat receiving portion and the heat dissipation portion;
the first duct is connected to the first extension portion of the heat radiating portion of the first light source device and the first extension portion of the heat radiating portion of the second light source device;
The second duct is connected to the second extension portion of the heat radiating portion of the first light source device and the second extension portion of the heat radiating portion of the second light source device. lighting equipment. a lighting device according to any one of claims 1 to 5;
a light modulating device that modulates light emitted from the lighting device;
and a projection optical device that projects the light modulated by the light modulation device. a light source that emits light;
a heat receiving unit that is connected to the light source and receives heat generated by the light source;
a heat radiating unit connected to the heat receiving unit and radiating heat conducted from the heat receiving unit to a cooling gas introduced therein ;
and a duct connected to the heat radiating part,
The heat dissipation part is
When the heat radiating portion is viewed along the first direction from the heat receiving portion to the heat radiating portion, the heat radiating portion extends in the second direction crossing the first direction from the region connected to the heat receiving portion and is introduced into the heat radiating portion. a first extension part through which a part of the cooling gas can flow ; and a part of the cooling gas that extends from the region in a direction opposite to the second direction and is introduced into the heat radiation part. a flowable second extension;
A first shielding portion arranged in the first direction in the first extension portion , and a first shielding portion arranged in the first direction in the second extension portion, the first shielding portion a second shielding portion arranged away from the first shielding portion in a direction opposite to the two directions ;
an introducing portion provided between the first shielding portion and the second shielding portion in the second direction in the heat radiating portion for introducing the cooling gas into the heat radiating portion ;
The duct is
a first duct connected to the first extension and through which the cooling gas that has flowed through the first extension flows ;
and a second duct that is connected to the second extension and through which the cooling gas that has circulated through the second extension circulates .

Images