JP6651784B2 - Wavelength conversion device, illumination device, and projector - Google Patents

Description

  The present invention relates to a wavelength conversion device, a lighting device, and a projector.

  2. Description of the Related Art Conventionally, a projector that modulates light emitted from a light source to form an image according to image information, and enlarges and projects the formed image on a projection surface such as a screen is known. As such a projector, there is known a projector including a fluorescent light emitting device that emits fluorescent light when excited by incident excitation light, and a plurality of cooling fans (for example, see Patent Document 1).

  The projector described in Patent Document 1 includes a light source unit, a display element, and a projection optical system, and the light source unit includes a blue light source device, a fluorescent light emitting device, and a red light source device. Among these, in the fluorescent light emitting device, a fluorescent light emitting region in which a green phosphor layer is formed, and a diffuse transmission region that diffuses and transmits the blue emission light from the blue light source device are arranged in a circumferential direction. With a fluorescent wheel. Then, a part of the laser light in the blue wavelength band emitted from the blue light source device is incident on the fluorescent light emitting region, so that a light beam (green light) in the green wavelength band is generated, and a part of the laser light is By being incident on the diffuse transmission region, diffuse transmission light (blue light) in the blue wavelength band is generated. Also, light in the red wavelength band (red light) emitted from the red light source device follows the optical path of blue light and green light by a dichroic mirror or the like, and these color lights are sequentially incident on the display element to form an image. Is formed.

  Since high-power laser light emitted from the blue light source device enters the fluorescent light emitting region and the diffuse transmission region, the temperatures of these regions increase. In addition, a wheel motor that rotates a fluorescent wheel in which these regions are arranged is also a heat source. For this reason, the projector described in Patent Document 1 is provided with a cooling fan that directly blows the outside air of the projector as cooling air, and cools the fluorescent wheel and the wheel motor by the cooling air.

JP 2011-75898 A

  However, in the case of a configuration in which cooling air is blown onto the fluorescent wheel to cool the fluorescent wheel while rotating the fluorescent wheel as in the projector described in Patent Document 1, heat of the fluorescent wheel is conducted and the fluorescent wheel radiates from the fluorescent wheel. The discharged cooling air is sucked by the rotation of the fluorescent wheel, and flows again to the fluorescent wheel side. For this reason, the temperature of the cooling air flowing through the fluorescent wheel increases, and there is a problem that it is difficult to efficiently cool the fluorescent wheel, that is, the fluorescent light emitting region including the phosphor.

  SUMMARY An advantage of some aspects of the invention is to provide a wavelength conversion device, a lighting device, and a projector that can efficiently cool a phosphor.

  The wavelength conversion device according to the first aspect of the present invention includes a substrate having a phosphor layer containing a phosphor, a rotating device for rotating the substrate, a circulation device for flowing a cooling gas through the substrate, the substrate, A housing for accommodating the circulation device, wherein the housing is a first space in which the cooling gas flows through the substrate by the circulation device, and the substrate is radially sent from the substrate by rotation of the substrate. It is characterized by having a partition separating the second space through which the cooling gas flows.

  According to the first aspect, the housing accommodating the substrate and the circulation device is a partition wall that separates the first space on the circulation side of the cooling gas to the substrate and the second space on the discharge side of the cooling gas from the substrate. Having. Thus, the cooling gas radially discharged from the substrate, that is, the cooling gas used for cooling the substrate, can be suppressed from flowing to the first space side while being heated and flowing again to the substrate. Therefore, the flow of the heated cooling gas to the substrate can be suppressed, so that the phosphor of the phosphor layer of the substrate can be efficiently cooled.

In the first aspect, it is preferable that the partition has an opening through which the cooling gas flows through the substrate, and an opening shape of the opening substantially coincides with a rotation range of the substrate.
According to such a configuration, the cooling gas circulated by the circulation device can be reliably circulated to the substrate through the opening. In addition, since the size of the opening substantially coincides with the rotation range of the substrate, it is possible to suppress the cooling gas radially discharged during the rotation of the substrate from flowing into the first space. Therefore, the cooling gas having a relatively high temperature can be suppressed from flowing through the substrate, and the cooling gas having a relatively low temperature can be reliably caused to flow through the substrate, so that the phosphor can be cooled more efficiently. .

In the first aspect, the substrate preferably has a plurality of fins extending outward from a center side of the substrate on a surface to which the cooling gas is blown.
According to such a configuration, the contact area of the substrate with the cooling gas can be increased by the plurality of fins, and the heat of the substrate can be efficiently transmitted to the cooling gas.
Further, since each of the plurality of fins extends outward from the center side of the substrate, the cooling gas is easily discharged radially by the rotation of the substrate. The stagnation of the gas around the substrate can be suppressed.

In the first aspect, it is preferable that each of the plurality of fins has a shape that warps in a direction opposite to a rotation direction of the substrate from the center side of the substrate toward the outside.
According to such a configuration, it is possible to easily discharge the hot cooling gas radially from the substrate. Further, when the cooling gas flows along the substrate in a direction opposite to the rotation direction in a certain portion of the substrate, each fin and the cooling gas collide so as to face each other, and thus each fin is cooled by the cooling gas. It can be cooled more efficiently. Therefore, the substrate and the phosphor can be cooled more efficiently.

In the first aspect, the heat absorbing device includes a heat absorbing device that absorbs heat of the cooling gas, the heat absorbing device includes a heat receiving device that is disposed on an intake side of the circulation device and receives heat from the flowing cooling gas, It is preferable that the vessel has a first flow path through which the cooling gas flows in the first space, and a second flow path through which the cooling gas flows in the second space.
According to such a configuration, since the heat of the cooling gas provided for cooling the substrate is transmitted to the heat receiver of the heat absorbing device, the cooling gas can be cooled. Therefore, the temperature of the cooling gas flowing through the substrate can be reduced, and the substrate can be cooled more efficiently.
In addition, the heat receiver includes not only the second flow path through which the cooling gas discharged from the substrate, that is, the cooling gas having the heat of the substrate, but also the first flow through which the cooling gas in the first space flows. Have a road. Thereby, the temperature of the cooling gas circulated through the substrate by the circulating device can be further reduced. Therefore, the substrate, and thus the phosphor, can be cooled more efficiently.

In the first aspect, it is preferable that the heat absorbing device includes a heat conducting member connected to the heat receiver and configured to conduct heat conducted to the heat receiver to the outside of the housing.
In addition, as a heat conductive member, a thermoelectric element such as a heat pipe or a Peltier element can be exemplified.
According to such a configuration, since the heat conducted from the cooling gas to the heat receiver can be transmitted to the outside of the housing by the heat conducting member, the temperature of the cooling gas in the housing can be reliably reduced. Therefore, the substrate through which the cooling gas flows, and thus the phosphor can be more effectively cooled.

In the first aspect, the heat conductive member includes a first heat conductive member disposed in the first flow path, and a second heat conductive member disposed in the second flow path. The heat conduction member preferably has a larger contact area with the heat receiver than the first heat conduction member.
When a heat pipe is used as the heat conducting member, the contact area of the heat conducting member with the heat receiving member should be increased by increasing the cross-sectional area in contact with the heat receiving device or increasing the number of heat conducting members. Can be. On the other hand, when a thermoelectric element is employed, it is possible to increase the contact area of the heat conducting member with respect to the heat receiver by increasing the number of the thermoelectric elements employed or adopting a thermoelectric element having a large area. it can.
Here, since the cooling gas discharged from the substrate flows through the second flow path, the temperature of the cooling gas flowing through the second flow path is higher than the temperature of the cooling gas flowing through the first flow path.
On the other hand, in the above configuration, the contact area of the second heat conduction member arranged in the second flow path with the heat receiver is larger than the contact area of the first heat conduction member arranged in the first flow path with the heat receiver. . According to this, the heat transmitted to the heat receiver can be efficiently transmitted to the outside of the housing, and the cooling gas can be efficiently cooled by the heat receiver. Therefore, a cooling gas having a lower temperature can be passed through the substrate, and the phosphor can be cooled more efficiently.

In the first aspect, it is preferable that the heat receiver has a partition portion connected to the partition to separate the first flow path and the second flow path.
According to such a configuration, it is possible to suppress the cooling gas flowing through the second flow path from flowing through the first flow path. According to this, heat can be efficiently received from the cooling gas flowing through each channel.
It has a heat conducting member including the first heat conducting member and the second heat conducting member, and the contact area of the second heat conducting member with the heat receiver is larger than the contact area of the first heat conducting member with the heat receiver. In this case, the cooling gas flowing through the second flow path can be suppressed from flowing through the first flow path having a small contact area with the first heat conducting member. The generated heat can be efficiently transmitted to the outside of the housing, and the cooling gas can be efficiently cooled.

In the first aspect, the housing is preferably a closed housing.
Here, when a relatively strong excitation light is incident on the phosphor layer, a phenomenon called light collection tends to occur. As described above, when the dust easily collects, the utilization efficiency of the excitation light decreases, and the possibility that a problem occurs in the rotation of the substrate by the rotating device increases.
On the other hand, according to the above configuration, it is possible to suppress dust from entering the housing. Therefore, it is possible to suppress a decrease in the utilization efficiency of the pump light and to configure a highly reliable wavelength converter.
Further, when the wavelength conversion device includes the heat absorbing device having a heat receiver and the heat receiver is disposed in the housing, the temperature of the cooling gas circulating in the housing and flowing to the substrate is surely reduced. Can be.

A lighting device according to a second aspect of the present invention includes the wavelength conversion device described above, and a light source unit that emits light incident on the wavelength conversion device.
According to the second aspect, the same effects as those of the wavelength conversion device according to the first aspect can be obtained.

A projector according to a third aspect of the present invention includes the illumination device, an image forming device that forms an image using light emitted from the illumination device, and a projection optical device that projects the formed image. 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.

FIG. 1 is a schematic perspective view showing a projector according to a first embodiment of the invention. FIG. 2 is a schematic diagram illustrating a configuration of a projector according to the first embodiment. FIG. 2 is a schematic diagram illustrating a configuration of a lighting device according to the first embodiment. FIG. 2 is a perspective view illustrating an appearance of the wavelength conversion device according to the first embodiment. FIG. 2 is a cross-sectional view illustrating the wavelength converter according to the first embodiment. FIG. 6 is a cross-sectional view taken along line AA of the wavelength conversion device shown in FIG. 5. FIG. 6 is a cross-sectional view taken along line BB of the wavelength conversion device shown in FIG. 5. FIG. 3 is a schematic diagram illustrating a flow of a cooling gas in a housing according to the first embodiment. FIG. 6 is a cross-sectional view illustrating a wavelength converter provided in a projector according to a second embodiment of the invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[Schematic configuration of projector]
FIG. 1 is a schematic perspective view showing a projector 1 according to the present embodiment.
The projector 1 according to the present embodiment modulates light emitted from a lighting device 31 described later to form an image according to image information, and enlarges and projects the image on a projection surface such as a screen. Device. As shown in FIG. 1, the projector 1 includes an exterior housing 2 that forms an exterior.
As will be described in detail later, the projector 1 includes a wavelength conversion device 5 that constitutes the illumination device 31. The wavelength conversion device 5 includes a wavelength conversion element 52, a distribution device 55, and a heat absorption device 56, and these are housed therein. One of the features is that the phosphor layer 522 of the wavelength conversion element 52 is cooled by circulating a cooling gas in the casing 51 by a circulation device 55. I have.
Hereinafter, the configuration of the projector 1 will be described.

[Structure of exterior housing]
The exterior housing 2 is formed in a substantially rectangular parallelepiped shape, and has a top surface portion 21, a bottom surface portion 22, a front surface portion 23, a back surface portion 24, a left side surface portion 25, and a right side surface portion 26.
The top surface 21 is provided with a pair of grips 211, and the bottom surface 22 is provided with legs (not shown) that comes into contact with the mounting surface on which the projector 1 is mounted. An opening 231 that exposes a part of a projection optical device 36 described later is formed in the front part 23. Further, although not shown, an inlet for introducing external air is formed in the right side portion 26, and an exhaust port for discharging air flowing through the exterior housing 2 is formed in the left side portion 25. I have.

FIG. 2 is a schematic diagram illustrating a configuration of the projector 1 according to the present embodiment.
As shown in FIG. 2, the projector 1 includes an optical unit 3 which is an image projection device housed in the exterior housing 2, in addition to the exterior housing 2. In addition, although not shown, the projector 1 includes a control device that controls the projector 1, a cooling device that cools a cooling target such as an optical component, and a power supply device that supplies power to electronic components.

[Configuration of optical unit]
The optical unit 3 includes an illumination device 31, a color separation device 32, a parallelizing lens 33, an image forming device 34, a color combining device 35, and a projection optical device 36.
Among these, the illumination device 31 emits the illumination light WL. The configuration of the lighting device 31 will be described later in detail.

The color separation device 32 separates the illumination light WL incident from the illumination device 31 into red, green, and blue color lights LR, LG, and LB. The color separation device 32 includes dichroic mirrors 321, 322, reflection mirrors 323, 324, 325, and relay lenses 326, 327.
The dichroic mirror 321 separates the 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 reflection mirror 323 and guided to the parallelizing lens 33 (33B). The separated other color light is incident on the dichroic mirror 322.
The dichroic mirror 322 separates the green light LG and the red light LR from the other color light. The separated green light LG is guided to the collimating lens 33 (33G). 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 collimating lens 33 (the collimating lenses for the red, green, and blue color lights are referred to as 33R, 33G, and 33B, respectively) collimates the incident light.

  The image forming apparatus 34 (the image forming apparatuses for the red, green, and blue color lights are referred to as 34R, 34G, and 34B, respectively) modulates the incident color lights LR, LG, and LB, respectively, and converts the modulated light into image information. An image light is formed by the corresponding color lights LR, LG, LB. Each of the image forming apparatuses 34 includes, for example, a liquid crystal panel as a light modulation device that modulates incident light, and a pair of polarizing plates disposed on an incident side and an emission side of the liquid crystal panel. Is done.

The color synthesizing device 35 synthesizes the image light of each color light LR, LG, LB incident from each of the image forming devices 34R, 34G, 34B. In the present embodiment, such a color synthesizing device 35 is configured by a cross dichroic prism.
The projection optical device 36 enlarges and projects the image light combined by the color combining device 35 onto a projection surface such as the screen SC1. As such a projection optical device 36, for example, a set lens composed of a lens barrel and a plurality of lenses arranged in the lens barrel can be adopted.

[Configuration of lighting device]
FIG. 3 is a schematic diagram illustrating a configuration of the lighting device 31.
The illumination device 31 emits the illumination light WL toward the color separation device 32 as described above. The lighting device 31 includes a light source device 4 and a uniformizing device 6, as shown in FIG.
The light source device 4 includes a light source unit 41, an afocal optical system 42, a homogenizer optical system 43, a first retardation plate 44, a polarization separation device 45, a second retardation plate 46, a first pickup lens 47, a diffuse reflection element 48, A second pickup lens 49 and a wavelength converter 5 are provided.

The light source unit 41, the afocal optical system 42, the homogenizer optical system 43, the first retardation plate 44, the polarization beam splitter 45, the second retardation plate 46, the first pickup lens 47, and the diffuse reflection element 48 are connected to the illumination optical axis Ax1. Is placed on top. Note that the polarization separation device 45 is disposed at the intersection of the illumination optical axis Ax1 and the illumination optical axis Ax2 orthogonal to the illumination optical axis Ax1.
The light source unit 41 includes a plurality of LDs (Laser Diodes) 411 and a parallelizing lens 412 corresponding to each LD 411, and emits blue light as excitation light toward the afocal optical system 42. In the present embodiment, each LD 411 emits, for example, excitation light having a peak wavelength of 440 nm. However, an LD that emits excitation light having a peak wavelength of 446 nm may be employed. LDs that respectively emit light may be mixed. The excitation light emitted from the LD 411 is collimated by the collimating lens 412 and is incident on the afocal optical system 42. In the present embodiment, the excitation light emitted from each LD 411 is S-polarized light.
The afocal optical system 42 adjusts the beam diameter of the excitation light incident from the light source unit 41. The afocal optical system 42 includes lenses 421 and 422. The excitation light that has passed through the afocal optical system 42 enters the homogenizer optical system 43.

The homogenizer optical system 43 cooperates with the later-described pickup lenses 47 and 49 to uniform the illuminance distribution of the excitation light in the respective illuminated regions of the diffuse reflection element 48 and the wavelength conversion device 5. The homogenizer optical system 43 includes a pair of multi-lens arrays 431 and 432 in which a plurality of small lenses are arranged in a matrix in a plane orthogonal to the optical axis. The excitation light emitted from the homogenizer optical system 43 enters a first phase difference plate 44.
The first retardation plate 44 is a half-wave plate. The first retardation plate 44 converts part of the S-polarized light into P-polarized light in the process of transmitting the incident excitation light. Thus, the excitation light incident on the first retardation plate 44 is emitted as light in which S-polarized light and P-polarized light are mixed. The excitation light thus converted is incident on the polarization separation device 45.

The polarization separation device 45 is a prism-type PBS (Polarizing Beam Splitter), and prisms 451 and 452 each formed in a substantially triangular prism shape are bonded at an interface corresponding to the hypotenuse, thereby forming a substantially rectangular parallelepiped shape. I have. This interface is inclined at approximately 45 ° with respect to each of the illumination optical axis Ax1 and the illumination optical axis Ax2. Then, a polarization separation layer 453 is formed at the interface of the prism 451 located on the first retardation plate 44 side (that is, the light source unit 41 side) in the polarization separation device 45.
The polarization separation layer 453 has wavelength-selective polarization separation characteristics. Specifically, the polarization separation layer 453 has a characteristic of reflecting one of the S-polarized light and the P-polarized light included in the excitation light and transmitting the other, and separating these polarized lights. Further, the polarization separation layer 453 has a property of transmitting the fluorescent light generated in the wavelength converter 5 regardless of the polarization state.
With such a polarization splitting device 45, of the excitation light incident from the first retardation plate 44, the P-polarized light is transmitted to the second retardation plate 46 along the illumination optical axis Ax1, and becomes the S-polarized light. Is reflected toward the second pickup lens 49 along the illumination optical axis Ax2.

The second retardation plate 46 is a quarter-wave plate, and rotates the polarization direction of the incident light in the process of transmitting the incident light. Therefore, the P-polarized light incident from the polarization separation device 45 is incident on the first pickup lens 47 with the polarization direction rotated.
The first pickup lens 47 condenses the excitation light transmitted through the second phase difference plate 46 and incident on the diffuse reflection element 48. In the present embodiment, the number of lenses constituting the first pickup lens 47 is three, but the number is not limited to this, and the number of lenses is not limited.

The diffuse reflection element 48 diffusely reflects the incident excitation light, similarly to the fluorescent light generated and reflected by the wavelength converter 5 described later. As the diffuse reflection element 48, a reflection member that Lambertian-reflects an incident light beam can be exemplified.
The excitation light diffusely reflected by the diffuse reflection element 48 is incident on the second phase difference plate 46 again via the first pickup lens 47. The polarization direction of the excitation light is further rotated in the process of transmitting through the second retardation plate 46, and the excitation light is converted into S-polarized light. Then, the excitation light is reflected by the polarization separation layer 453 of the polarization separation device 45 and is incident on the homogenization device 6.

The second pickup lens 49 and the wavelength conversion device 5 are arranged on the illumination optical axis Ax2.
The second pickup lens 49 receives the S-polarized component of the excitation light from the first retardation plate 44 via the polarization separation layer 453. The second pickup lens 49 focuses the excitation light on the wavelength converter 5. In the present embodiment, the number of lenses constituting the second pickup lens 49 is set to 3 as in the case of the first pickup lens 47, but the number is not limited to this, and the number of lenses is not limited.

  The wavelength converter 5 generates fluorescent light by the incident excitation light. The fluorescent light generated by the wavelength conversion element 52 is incident on the polarization separation layer 453 of the polarization separation device 45 via the second pickup lens 49. This fluorescent light is non-polarized light, but since the polarization separation layer 453 has a wavelength-selective polarization separation characteristic as described above, the fluorescent light passes through the polarization separation layer 453 and becomes uniform. Is incident on. The configuration of the wavelength conversion device 5 will be described later in detail.

As described above, the P-polarized light of the excitation light emitted from the light source unit 41 and incident on the polarization separation device 45 is diffused by being incident on the diffuse reflection element 48, and is also diffused by the second retardation plate 46. Is transmitted twice to be converted into S-polarized light, and is reflected by the polarization separator 45 toward the homogenizer 6.
On the other hand, of the excitation light, the S-polarized light is wavelength-converted into fluorescent light by the wavelength converter 5 and then emitted to the homogenizer 6 via the polarization separator 45.
That is, the blue light and the fluorescent light (light including green light and red light), which are part of the excitation light, are synthesized by the polarization separation device 45 and are incident on the homogenization device 6 as white illumination light WL. You.

[Configuration of homogenizing device]
The uniformizing device 6 shown in FIG. 3 equalizes the illuminance in the plane orthogonal to the optical axis of the light beam incident on each of the image forming devices 34 (34R, 34G, 34B), which are the illuminated areas, and also aligns the polarization directions. Has functions. The equalizing device 6 includes a first lens array 61, a second lens array 62, a polarization conversion element 63, and a superposition lens 64.
The first lens array 61 has a configuration in which the first lenses 611 are arranged in a matrix in a plane orthogonal to the optical axis, and divides an incident light beam (illumination light WL) into a plurality of partial light beams.
The second lens array 62 has a configuration in which second lenses 621 corresponding to the first lenses 611 are arranged in a matrix in a plane orthogonal to the optical axis. The second lenses 621 superimpose a plurality of partial light beams split by the first lenses 611 on the image forming apparatuses 34 together with the superimposing lens 64.
The polarization conversion element 63 is disposed between the second lens array 62 and the superimposing lens 64, and aligns the polarization directions of the plurality of partial light beams. Illumination light WL formed by a plurality of partial light beams whose polarization directions are aligned by the polarization conversion element 63 is incident on the color separation device 32 via a superimposing lens 64.

[Configuration of wavelength converter]
FIG. 4 is a perspective view illustrating an appearance of the wavelength conversion device 5, and FIG. 5 is a cross-sectional view illustrating the wavelength conversion device 5. 6 is a cross-sectional view taken along line AA of the wavelength conversion device 5 in FIG. 5, and FIG. 7 is a cross-sectional view taken along line BB of the wavelength conversion device 5 in FIG.
The wavelength conversion device 5 includes a housing 51 as shown in FIGS. 3 to 7, and also includes a wavelength conversion element 52 disposed in the housing 51 and a rotating device as shown in FIGS. 4 to 7. 53, a mounting member 54, a distribution device 55, and a heat absorbing device 56, some of which are disposed inside the housing 51 and other components are disposed outside the housing 51.
Among these, the heat absorbing device 56 has a heat receiver 561 (FIGS. 5 and 7) and, as shown in FIG. 4, a plurality of heat pipes 562, a radiator 563, and a cooling fan 564. The configuration of such a heat absorbing device 56 will be described later in detail.

  In the following description, the traveling direction of the excitation light with respect to the wavelength conversion device 5 is defined as a + Z direction, and directions orthogonal to the + Z direction and orthogonal to each other are defined as a + X direction and a + Y direction. Among these, the + X direction is the direction in which the radiator 563 is located with respect to the housing 51, and the + Y direction is orthogonal to each of the + Z direction and the + X direction, and when viewed from the + Z direction side, the distribution device 55 and the heat receiving device From the device 561 to the wavelength conversion element 52. For convenience of description, the direction opposite to the + Z direction is referred to as a -Z direction. The same applies to the -X direction and the -Y direction.

[External configuration of housing]
The housing 51 is a closed housing in which a storage space S for housing the wavelength conversion element 52, the rotation device 53, the mounting member 54, the circulation device 55, and the heat receiver 561 constituting the heat absorption device 56 is formed. is there. As shown in FIG. 4, the casing 51 has a substantially semicircular shape on the + Y direction side and a substantially rectangular shape on the −Y direction side when viewed from the −Z direction side.
Such a housing 51 includes a side surface portion 51A located on the −Z direction side, a side surface portion 51B located on the + Z direction side, a side surface portion 51C located on the + X direction side, a side surface portion 51D located on the −X direction side, It has a side surface portion 51E located on the + Y direction side and a side surface portion 51F located on the -Y direction side.

The side surface portion 51A is a side surface portion on the light incident side in the housing 51. An opening 511 into which a lens closest to the wavelength conversion element 52 among a plurality of lenses constituting the second pickup lens 49 is formed in the side surface 51A.
A plurality of holes 512 through which a heat pipe 562 constituting a heat absorbing device 56 described later is inserted are formed in the side surface portion 51C.
The side surface portion 51E is a portion formed in an arc shape when viewed from the −Z direction side.

[Internal configuration of housing]
As shown in FIG. 5, the housing 51 has a first partition 513, a second partition 514, and a third partition 515 that partition the storage space S to form the spaces S1 to S4.
The first partition 513 is formed along the XY plane at a position inside the housing 51 at a predetermined distance from the side surface 51A so as to be connected to the inner surfaces of the side surfaces 51C to 51F. In the space S3 (second space) surrounded by the first partition 513 and the inner surfaces of the side surfaces 51A, 51C to 51F, the wavelength conversion element 52 and the -Z direction side of the rotating device 53 are located at the + Y direction side. And a portion on the −Z direction side of the heat receiver 561 is disposed at a position on the −Y direction side.

An opening 5131 is formed at a position corresponding to the wavelength conversion element 52 in the first partition 513. The opening shape of the opening 5131 substantially coincides with the rotation range of the substrate 521 as shown in FIGS. In other words, the opening 5131 is formed in a substantially circular shape according to the outer shape of the substrate 521 during rotation, and the inner diameter of the opening 5131 is equal to the diameter of the wavelength conversion element 52 (substrate 521) during rotation. They almost match. Then, the center position of the opening 5131 substantially coincides with the center position of the wavelength conversion element 52 (substrate 521).
As shown in FIG. 7, a substantially rectangular opening 5132 that substantially matches the outer shape of the heat receiver 561 is formed at a portion of the first partition 513 on the −Y direction side. The opening area of the opening 5132 substantially matches the cross-sectional area of the heat receiver 561, and the heat receiver 561 is fitted into the opening 5132.

As shown in FIG. 5, the second partition 514 is formed along the XZ plane on the + Z direction side with respect to the first partition 513 and substantially at the center of the housing 51 in the + Y direction. That is, the second partition 514 is connected to the first partition 513 so as to be substantially orthogonal to the first partition 513, and is also connected to the inner surfaces of the side surfaces 51B to 51D. In the space S2 (first space) surrounded by the second partition 514, the first partition 513, and the inner surfaces of the side surfaces 51B to 51E, a portion on the + Z direction side of the rotating device 53 and the mounting member 54 are provided. Besides, as shown in FIG. 6, a part of the circulation device 55 on the + Y direction side is arranged.
As shown in FIGS. 6 and 7, the center C of the wavelength conversion element 52 (the center C of the substantially circular substrate 521) is viewed from the + Z direction side inside the side surfaces 51C to 51E. An arc-shaped portion 516 formed in a substantially circular shape is formed outside the wavelength conversion element 52. The arc-shaped portion 516, the surface of the second partition 514 on the + Y direction side, and the inner surface of the side surface portion 51B. Thus, the space S2 is formed. Therefore, the space S2 is a substantially circular space when viewed from the + Z direction side.

  As shown in FIG. 5, the third partition 515 partitions the space on the −Y direction side with respect to the second partition 514 into a space S1 on the + Z direction side and a space S4 on the −Z direction side. The third partition 515 is formed along the XY plane between the first partition 513 and the inner surface of the side surface 51B at a position on the −Y direction side with respect to the second partition 514. That is, the third partition 515 is formed in parallel with the first partition 513, and is connected to the second partition 514 and the inner surfaces of the side surfaces 51C, 51D, and 51F. As shown in FIG. 5 and FIG. 7, the space S4 surrounded by the third partition 515, the first partition 513 and the second partition 514, and the inner surfaces of the side surfaces 51C, 51D, and 51F has the heat receiver 561. A part on the + Z direction side is arranged. Further, in the space S1 surrounded by the third partition 515, the second partition 514, and the inner surfaces of the side surfaces 51B to 51D and 51F, as shown in FIGS. Side part is arranged.

As shown in FIG. 5, an opening 5141 that connects the spaces S2 and S4 is formed at a position corresponding to the heat receiver 561 in the second partition 514.
An opening 5151 that connects the space S4 and the space S1 is formed substantially at the center of the third partition 515 at a position corresponding to the heat receiver 561 and the air inlet 552 of the circulation device 55.
Further, as shown in FIGS. 5 and 6, at the position on the + Z direction side of the opening 5141 and the position on the + X direction side of the opening 5141 in the second partition 514, the opening where the discharge unit 553 of the circulation device 55 is arranged is provided. A portion 5142 is formed.

[Configuration of wavelength conversion element]
The wavelength conversion element 52 generates and emits the fluorescent light according to the incidence of the excitation light. As shown in FIG. 5, the wavelength conversion element 52 is disposed in the space S3 such that a predetermined gap is formed between the wavelength conversion element 52 and the inner surface of the side surface 51A.
As shown in FIGS. 3 and 5, such a wavelength conversion element 52 has a substrate 521 rotated by a rotation device 53 to be described later, and the substrate 521 includes a phosphor layer (wavelength conversion layer) 522 and a reflection layer 522. It has a layer 523, a connection portion 524, and a plurality of fins 525.
Among these, as shown in FIGS. 6 and 7, the substrate 521 is formed in a substantially circular shape when viewed from the + Z direction side. The substrate 521 is formed of a member having thermal conductivity, and in this embodiment, is formed of metal.

As shown in FIGS. 3 and 5, the phosphor layer 522 and the reflection layer 523 are located on the surface 521A of the substrate 521 on the incident side (−Z direction side) of the excitation light.
The phosphor layer 522 includes a phosphor that is excited by incident excitation light and emits fluorescent light (for example, light in a wavelength range of 500 to 700 nm). When the excitation light is incident on the phosphor layer 522, a part of the fluorescent light is emitted to the second pickup lens 49 side and another part is emitted to the reflection layer 523 side.
The reflection layer 523 is disposed between the phosphor layer 522 and the substrate 521, and reflects the fluorescent light incident from the phosphor layer 522 toward the second pickup lens 49.

The connecting portion 524 and the plurality of fins 525 are located on a surface 521B on the opposite side (+ Z direction side) from the surface 521A, as shown in FIGS.
The connection part 524 is a part located at the center of the surface 521B and connected to the rotating device 53.
The plurality of fins 525 are formed around the connection portion 524. More specifically, the plurality of fins 525 are formed in a region outside the connection portion 524 on the surface 521B so as to extend outward from a position on the center side. These fins 525 are not formed in a straight line from the center of the substrate 521 to the outside. Instead, the fins 525 are opposite to the rotation direction (D direction) of the substrate 521 by the rotating device 53 toward the outside. It is formed in the shape of a curved arc. That is, each fin 525 does not extend radially, but is formed in a spiral shape that spirals in a direction opposite to the direction D so as not to make a half turn around the substrate 521. Heat generated in the phosphor layer 522 is conducted to the fins 525 via the substrate 521. Then, heat exchange is performed between the fins 525 and a cooling gas circulated by the circulating device 55 to be described later, whereby the fins 525 and, by extension, the phosphor layer 522 are cooled.

[Configuration of rotating device]
As shown in FIGS. 5 to 7, the rotation device 53 is configured by a motor or the like that rotates through the center C of the wavelength conversion element 52 and about a rotation axis RA along the + Z direction. The rotation device 53 is located on the + Z direction side with respect to the wavelength conversion element 52 and is connected to the connection portion 524. As shown in FIGS. 6 and 7, the wavelength conversion element 52 is viewed from the + Z direction side. Rotate in the D direction, which is a counterclockwise direction. By the rotation of the wavelength conversion element 52, the position where the excitation light is incident on the phosphor layer 522 is changed, so that a portion where heat is generated in the phosphor layer 522 is dispersed. Local heat generation is suppressed, and heat exchange with cooling gas is promoted.

[Configuration of mounting member]
One end of the mounting member 54 is connected to the rotating device 53, and the other end is fixed to the inner surface of the side surface portion 51 </ b> B on the + Z direction side of the housing 51, thereby mounting the rotating device 53 inside the housing 51. As shown in FIGS. 6 and 7, the mounting member 54 is formed in a column shape having a central axis along the + Z direction so as not to obstruct the flow of the cooling gas discharged by the flow device 55 described later. In addition, they are disposed so as to be located inside the fins 525 when viewed from the + Z direction side. In addition, the mounting member 54 may be formed in a prismatic shape. In this case, the cross section of the mounting member 54 has a polygonal shape having more corners in terms of not obstructing the flow of the cooling gas. Preferably, there is.

[Configuration of distribution device]
The circulation device 55 circulates the cooling gas in the housing 51 and distributes the cooling gas to the wavelength conversion element 52 (specifically, the plurality of fins 525). In this embodiment, the distribution device 55 is configured by a sirocco fan.
The distribution device 55 is disposed across the spaces S1 and S2 as shown in FIGS. Specifically, the circulation device 55 is configured such that the intake port 552 that is located on the surface 551 in contact with the third partition 515 and sucks the cooling gas is located at a position corresponding to the opening 5151 of the third partition 515. , And are arranged to face the third partition 515. Then, in the circulation device 55, the discharge part 553 having the discharge port 554 for discharging the cooling gas is located in the space S2 as shown in FIG.
By such a circulation device 55, the cooling gas sucked from the space S4 in which the heat receiver 561 described later is located is discharged from the discharge port 554 located in the space S2 and circulates in the space S2, so that the opening portion Through the 5131, the light is distributed to the surface 521B of the wavelength conversion element 52.

Here, as shown in FIG. 6, the discharge section 553 (discharge port 554) passes through the center C of the wavelength conversion element 52 and extends along the + Y direction to intersect with the arc-shaped section 516. It is arranged shifted in the + X direction with respect to the virtual line VL. For this reason, as shown by the arrow AL when viewed from the + Z direction side, the cooling gas is sent out from the discharge port 554 to the + X direction side with respect to the wavelength conversion element 52, and then the arc-shaped portion 516 and the wavelength conversion element 52 and circulate clockwise along the surface 521B. That is, the flowing direction of the cooling gas flowing along the surface 521 </ b> B is opposite to the rotation direction of the substrate 521. Then, the cooling gas is taken into the plurality of fins 525, and after cooling the plurality of fins 525, is discharged radially into the space S3 by the rotation of the substrate 521.
The cooling gas that has cooled the wavelength conversion element 52 flows through the space S <b> 3 in the −Y direction due to the suction force of the flow device 55, and flows through the heat receiver 561 that constitutes the heat absorbing device 56.

[Configuration of heat absorbing device]
The heat absorbing device 56 absorbs heat from the cooling gas circulated in the housing 51 by the circulation device 55 and discharges the absorbed heat to the outside of the housing 51 to lower the temperature in the housing 51. The heat absorbing device 56 includes a heat receiver 561 (FIGS. 6 and 7) and a plurality of heat pipes 562 as shown in FIGS. 5 and 7, and is disposed outside the housing 51 as shown in FIG. A cooling radiator 563 and a cooling fan 564.

The heat receiver 561 receives the heat of the cooling gas (heat absorption), and is disposed so as to straddle the spaces S3 and S4 in the housing 51 as described above. More specifically, as shown in FIG. 5, the heat receiver 561 has a portion on the −Z direction side fitted into the opening 5132, and an end on the + Z direction side has a surface on the −Z direction side of the third partition 515. Is in contact with As described above, almost all of the cooling gas sucked by the circulation device 55 is the cooling gas that has circulated in the heat receiver 561.
As shown in FIG. 7, such a heat receiver 561 includes a plurality of plate-like fins 5611 extending along the Y direction (specifically, the YZ plane). The fins 5611 are arranged in parallel along the + X direction with a predetermined gap therebetween, and a flow path through which the cooling gas flows is formed between the fins 5611. Then, the heat receiver 561 receives heat from the cooling gas and cools the cooling gas.

Here, the + Y direction side portion of the heat receiver 561 is in contact with the + Y direction side edge of the edge of the opening 5132 of the first partition 513. The second partition 514 located on the + Y direction side of the heat receiver 561 and substantially perpendicular to the first partition 513 has an opening 5141 at a position corresponding to the heat receiver 561. Therefore, due to the suction force of the circulation device 55, a part of the cooling gas in the space S2 flows into the heat receiver 561, and the cooling gas that has cooled the wavelength conversion element 52 flows from the space S3. Then, these cooling gases are sucked by the circulation device 55. That is, a part of the cooling gas in the space S2 flows into the heat receiver 561, and the cooling gas that has cooled the wavelength conversion element 52 flows from the first flow path FP1 circulating to the circulation device 55 side and the space S3. And a second flow path FP2 flowing to the flow device 55 side.
Note that the flow path length of the second flow path FP2 is longer than the flow path length of the first flow path FP1. From this, it is possible to secure a flow path length that can sufficiently receive heat from the relatively high-temperature cooling gas flowing through the second flow path FP2.

  The plurality of heat pipes 562 (5621 and 5622) are heat conducting members that conduct the heat conducted to the heat receiver 561 to the radiator 563. As shown in FIGS. 5 and 7, one end of each of the heat pipes 562 is connected to a heat receiver 561 inside the housing 51, and the other end is connected to a radiator 563 outside the housing 51 as shown in FIG. You. In the present embodiment, three heat pipes 562 are provided, but the number of heat pipes 562 can be changed as appropriate.

Here, the temperature of the cooling gas flowing through the second flow path FP2 is higher than the temperature of the cooling gas flowing through the first flow path FP1. Therefore, the amount of heat conducted to the second flow path FP2 is higher than the amount of heat conducted to the first flow path FP1. For this reason, it is necessary to efficiently conduct the heat conducted from the first flow path FP1 to the second flow path FP2 outside the housing 51.
On the other hand, in the present embodiment, the heat pipe 562 provided in the second flow path FP2 (the heat pipe 562 that conducts heat conducted in the second flow path FP2 to the outside of the housing 51) contacts the heat receiver 561. The area is larger than the contact area of the heat pipe 562 provided in the first flow path FP1 (the heat pipe 562 that conducts the heat conducted in the first flow path FP1 to the outside of the housing 51) with the heat receiver 561. .
Specifically, the number of heat pipes 5622 provided in the second flow path FP2 is larger than the number of heat pipes 5621 provided in the first flow path FP1. More specifically, one heat pipe 5621 is provided in the first flow path FP1, while two heat pipes 5622 are provided in the second flow path FP2. Thus, the heat conducted to the first flow path FP1 and the second flow path FP2 can be efficiently transmitted to the outside of the housing 51 with a small number of heat pipes 562.

The radiator 563 radiates the heat of the heat receiver 561 conducted via the heat pipe 562 outside the housing 51, as shown in FIG. The radiator 563 has a plurality of fins 5631 formed of a metal having thermal conductivity, and the other end of the heat pipe 562 is arranged to penetrate these fins 5631.
The cooling fan 564 circulates a cooling gas (outside air introduced into the exterior housing 2) through the radiator 563 to release heat conducted to the radiator 563. In the present embodiment, the cooling fan 564 includes an axial fan. Have been. When the cooling fan 564 is driven, the cooling gas is sucked, so that the cooling gas is supplied to the radiator 563, and the radiator 563 is cooled. The cooling gas used for cooling the radiator 563 is sucked and discharged by the cooling fan 564, and is discharged to the outside of the exterior casing 2 by a fan (not shown) through an exhaust port formed in the exterior casing 2. Is discharged. In addition, the cooling fan 564 may be configured by a sirocco fan.

[Circulating gas circulation channel in the housing]
FIG. 8 is a schematic diagram showing a circulation path of the cooling gas in the housing 51.
As described above, the cooling gas in the housing 51 is circulated by the circulation device 55.
Specifically, the cooling gas discharged into the space S2 from the circulation device 55 located in the space S1 is located on the + Z direction side of the wavelength conversion element 52 located in the space S3, as shown by an arrow F1 in FIG. It flows to the surface 521B via the opening 5131 of the first partition 513.
The cooling gas flowing through the wavelength conversion element 52 enters between the plurality of fins 525 located on the surface 521B. At this time, the heat of the phosphor layer 522 conducted to each fin 525 is conducted to the cooling gas, and the fin 525 and thus the phosphor layer 522 are cooled.

As shown by an arrow F2, the cooling gas that has cooled the wavelength conversion element 52 is radiated between the fins 525 around the center C as viewed from the + Z direction side by rotation of the wavelength conversion element 52 by the rotating device 53. From the space S3.
While the cooling gas released from the wavelength conversion element 52 into the space S3 is prevented from flowing to the space S2 side by the first partition 513, the inside of the space S3 is -Y by the suction force of the flow device 55. It flows in the direction side and flows into the heat receiver 561. The cooling gas flows through the second flow path FP2 along the arrow F3, and flows into the flow device 55 through the opening 5151 that connects the space S4 to the space S1.
Also, due to the suction force of the circulation device 55, a part of the cooling gas in the space S2 flows along the arrow F4 into the heat receiver 561 located in the space S4 through the opening 5141 of the second partition 514. Is done. Then, the part of the cooling gas flows through the first flow path FP <b> 1 and flows into the flow device 55 through the opening 5151. Thereby, the temperature of the cooling gas discharged from the circulation device 55 and flowing through the wavelength conversion element 52 can be further reduced.
Note that, as described above, the heat conducted to the heat receiver 561 is conducted to the radiator 563 via the heat pipe 562 and is released to the outside of the housing 51.

[Effects of First Embodiment]
According to the projector 1 according to the embodiment described above, the following effects can be obtained.
The housing 51 in which the wavelength conversion element 52 having the substrate 521 and the circulation device 55 are housed has a space S2 (first space) on the cooling gas sending side to the substrate 521, and the cooling gas is discharged from the substrate 521. A first partition 513 separating the space S3 (second space).
According to this, the cooling gas radially discharged from the substrate 521, that is, the cooling gas that has cooled the substrate 521, is prevented from flowing to the space S <b> 2 side while being heated and flowing again to the substrate 521. it can. Therefore, the supply of the cooling gas having a high temperature to the substrate 521 can be suppressed, so that the substrate 521 on which the phosphor layer 522 is located, and further, the phosphor of the phosphor layer 522 can be efficiently cooled.
Further, since the cooling gas flowing toward the substrate 521 and the cooling gas discharged from the substrate 521 can be separated by the first partition 513, it is possible to suppress the collision of the cooling gas. Therefore, each cooling gas can be reliably circulated.

  The first partition 513 has an opening 5131 through which the cooling gas flows from the space S2 to the substrate 521, and the opening shape of the opening 5131 substantially matches the rotation range of the substrate 521. According to this, the cooling gas circulated by the circulation device 55 can be reliably circulated to the substrate 521 through the opening 5131. In addition, since the size of the opening 5131 substantially matches the rotation range of the substrate 521, the cooling gas radially discharged when the substrate 521 rotates rotates flows to the space S2 side, and returns toward the substrate 521 again. Distribution can be suppressed. Therefore, a cooling gas having a relatively low temperature can be reliably passed through the substrate 521, and the phosphor can be cooled more efficiently.

Since the substrate 521 has the plurality of fins 525, the contact area of the substrate 521 with the cooling gas can be increased as compared with the case where the plurality of fins 525 are not provided. Therefore, the heat of the substrate 521 can be efficiently conducted to the cooling gas, and the cooling efficiency of the substrate 521 can be further improved.
Further, since each of the plurality of fins 525 extends outward from the center side of the substrate 521, the cooling gas is easily discharged radially by the rotation of the substrate 521. Therefore, the cooling gas heated by cooling the substrate 521 can be prevented from staying around the substrate 521.

Each of the plurality of fins 525 has a shape that warps in a direction opposite to the rotation direction of the substrate 521 from the center side of the substrate 521 toward the outside. According to this, the hot cooling gas can be easily discharged radially from the substrate 521.
Since the cooling gas flows in the direction opposite to the rotation direction of the substrate 521, each fin 525 and the cooling gas collide so as to face each other. According to this, each fin 525 can be efficiently cooled by the cooling gas. Therefore, the substrate 521, and thus the phosphor, can be cooled more efficiently.

The wavelength conversion device 5 includes a heat absorbing device 56 that is disposed in the housing 51 and has a heat receiver 561 that receives heat of the flowing cooling gas. According to this, since the heat of the cooling gas provided for cooling the substrate 521 is transmitted to the heat receiver 561, the cooling gas sucked by the circulation device 55 and flowing through the substrate 521 can be cooled.
Further, the heat receiver 561 has the first flow path FP1 and the second flow path FP2. According to this, the cooling gas that has not been sufficiently exchanged heat by the heat receiver 561 in the course of flowing through the second flow path FP2 flows through the first flow path FP1 to generate more heat from the cooling gas. And the cooling gas can be further cooled.
Therefore, the temperature of the cooling gas flowing through the substrate 521 can be reliably reduced, and the substrate 521 and, by extension, the phosphor can be cooled more efficiently.

  One end of the heat absorbing device 56 is connected to the heat receiver 561, and the other end is connected to the radiator 563. It has a heat pipe 562. According to this, since the heat conducted to the heat receiver 561 can be reliably transmitted to the outside of the housing 51 by the heat pipe 562, the temperature of the cooling gas in the housing 51 can be reliably reduced. Therefore, the substrate 521 through which the cooling gas flows, and thus the phosphor can be more effectively cooled.

  In order to increase the contact area of the heat pipe 562 disposed in the second flow path FP2 with the heat receiver 561, the contact area of the heat pipe 562 disposed in the first flow path FP1 with the heat receiver 561 is increased. The number of the heat pipes 5622 as the second heat conducting members arranged in the second flow path FP2 is larger than the number of the heat pipes 5621 as the first heat conducting member arranged in the first flow path FP1. According to this, the heat conducted in the second flow path FP2 through which the relatively high-temperature cooling gas flows is made smaller than the heat conducted through the first flow path FP1 through which the relatively low-temperature cooling gas flows. Can be efficiently transmitted to the outside of the housing 51, so that the heat conducted to the heat receiver 561 can be efficiently transmitted to the outside of the housing 51 with a small number of heat pipes 562, and thus the cooling gas can be efficiently transmitted by the heat receiver 561. Can be cooled. Therefore, a cooling gas having a lower temperature can flow through the substrate 521, and the phosphor can be cooled more efficiently.

Here, when relatively strong excitation light is incident on the phosphor layer 522, a phenomenon called light collection tends to occur. As described above, when the dust easily collects, the utilization efficiency of the excitation light is reduced, and the possibility that the rotation of the substrate 521 by the rotating device 53 causes a problem is increased.
On the other hand, since the housing 51 is a sealed housing, it is possible to prevent dust from entering the housing 51. Therefore, it is possible to suppress a decrease in the use efficiency of the pump light and to configure the wavelength converter 5 with high reliability.

  As shown in FIG. 6, when viewed from the + Z direction side along the rotation axis RA of the wavelength conversion element 52 (the substrate 521), the cooling gas is partially distributed in the circumferential direction of the substrate 521 (for example, + X from the center C). In the part 521C located on the side of the direction 521 and the part 521D located on the side of the + Y direction), the fluid flows in a direction opposite to the rotation direction of the substrate 521 at the part. According to this, compared with the case where the cooling gas is blown onto the substrate 521 along the rotation axis RA, the time during which the cooling gas contacts the surface 521B of the substrate 521 can be made longer. In addition, since the cooling gas flows in a direction against the rotation of the substrate 521 in the above part, the relative flow velocity of the cooling gas with respect to the substrate 521 can be increased. Therefore, the phosphor of the substrate 521 and the phosphor of the phosphor layer 522 can be efficiently cooled.

  When the substrate 521 is viewed from the + Z direction side along the rotation axis RA, the housing 51 has an arc-shaped portion 516 that is located outside the substrate 521 and extends along the circumferential direction when the substrate 521 rotates. . According to this, the cooling gas flowing through the substrate 521 can be flown in the circumferential direction along the arc-shaped portion 516. For this reason, by rotating the substrate 521 in the D direction, the cooling gas can reliably flow in the direction opposite to the D direction. Therefore, the substrate 521, and thus the phosphor, can be reliably and efficiently cooled.

  The discharge port 554 of the circulation device 55 is disposed along a direction perpendicular to the rotation axis RA and shifted from a virtual line VL passing through the rotation axis RA and intersecting the arc-shaped portion 516. According to this, the cooling gas discharged from the discharge port 554 can be easily distributed in the substrate 521 while being biased to the side of the arrangement of the discharge port 554 with respect to the virtual line VL. Therefore, the cooling gas can reliably flow in the direction opposite to the rotation direction of the substrate 521 at the portion 521C, and the cooling gas can easily flow along the arc-shaped portion 516. In addition, the cooling gas can flow more reliably in the direction opposite to the rotation direction of the substrate 521. Therefore, the above-described effects can be obtained more reliably.

The substrate 521 has a plurality of fins 525 extending outward from the center side of the substrate 521 on the surface 521B through which the cooling gas is circulated by the circulation device 55. Further, an attachment member 54 for attaching the rotating device 53 to the inner surface of the side surface portion 51B is provided in the housing 51, and the attachment member 54 is provided when the substrate 521 is viewed from the + Z direction side along the rotation axis RA. , On the substrate 521, at a position closer to the center of the substrate 521 than the plurality of fins 525.
According to this, since each of the plurality of fins 525 extends outward from the center side of the substrate 521, the cooling gas can be easily discharged radially by the rotation of the substrate 521. Thereby, the cooling gas heated by cooling the substrate 521 can be prevented from staying around the substrate 521.
Further, in the above part (for example, the part 521C and the part 521D), the flow direction of the cooling gas and the rotation direction of the substrate 521 are opposite to each other, so that the cooling gas may collide with each fin 525 so as to face each other. it can. Therefore, each fin 525 can be efficiently cooled by the cooling gas, and the phosphor can be efficiently cooled.
Further, since the attachment member 54 is located closer to the center C than the fins 525, it is possible to suppress the fins 525 from being covered by the attachment member 54. Accordingly, the flow of the cooling gas flowing through each fin 525 can be prevented from being hindered by the mounting member 54, and the cooling gas can be reliably flown along the surface 521B.

  The attachment member 54 is formed in a column shape. According to this, even when a part of the cooling gas flows along the mounting member 54, it is possible to suppress the flow of the cooling gas from being hindered as compared with, for example, a case where the mounting member protrudes toward the flow path of the cooling gas. . Therefore, the cooling gas can flow smoothly through the substrate 521.

[Second embodiment]
Next, a second embodiment of the present invention will be described.
The projector according to the present embodiment has a configuration similar to that of the projector 1, but includes a heat receiver having a partition section for partitioning the first flow path FP <b> 1 and the second flow path FP <b> 2 instead of the heat receiver 561. In this respect, the projector according to the present embodiment is different from the projector 1 described above. In the following description, portions that are the same or substantially the same as the portions already described are denoted by the same reference numerals, and description thereof is omitted.

FIG. 9 is a diagram illustrating a cross section along a YZ plane of a wavelength conversion device 5A provided in the projector according to the present embodiment.
The projector according to the present embodiment has the same configuration and function as the projector 1 except that a wavelength converter 5A is used instead of the wavelength converter 5. As shown in FIG. 9, the wavelength converter 5A has the same configuration and function as the wavelength converter 5, except that a heat receiver 561A is provided instead of the heat receiver 561.
Similarly to the heat receiver 561, the heat receiver 561A is formed by a plurality of fins 5611 each of which is a metal plate, and has the first flow path FP1 and the second flow path FP2 formed therein. The heat receiver 561A has, as a difference from the heat receiver 561, a partition portion 5612 separating the first flow path FP1 and the second flow path FP2 therein.

The partition 5612 is connected to the edge of the opening 5132 of the first partition 513 at the end of the heat receiver 561A on the + Y direction side. Then, the dividing portion 5612, between the end of the + Y direction side, the heat Topaipu 562 provided on the first flow path FP1, two heat pipes 562 provided on the second flow path FP2 And extends to the end on the + Z direction side of the heat receiver 561A.

With such a partition portion 5612, it is possible to suppress the cooling gas flowing at a relatively high temperature flowing through the second flow path FP2 from flowing to the first flow path FP1 side where the number of the heat pipes 562 installed is small. Therefore, heat exceeding the amount of heat that can be conducted to the radiator 563 by the heat pipe 562 can be suppressed from being conducted to the region on the first flow path FP1 side of the heat receiver 561A, and the heat conducted to the heat receiver 561A can be reduced by heat. The pipe 562 can efficiently transmit to the radiator 563.
In addition, when the suction force of the circulation device 55 is high, the cooling gas that has cooled the wavelength conversion element 52 flows into the heat receiver immediately after flowing in the + Z direction and is sucked by the circulation device 55. There is a possibility that heat cannot be sufficiently received from the cooling gas. On the other hand, since the cooling gas can flow along the partition portion 5612, the flow path length through which the cooling gas can sufficiently receive heat from the cooling gas is set as the flow path length through which the cooling gas flows in the heat receiver 561A. It can be easily secured. Therefore, the cooling gas can be reliably cooled, and the cooling efficiency of the wavelength conversion element 52 can be improved.

[Effect of Second Embodiment]
According to the projector according to the embodiment described above, the same effects as those of the projector 1 can be obtained, and the following effects can be obtained.
The heat receiver 561A has a partition part 5612 connected to the edge of the opening 5132 in the first partition 513 to separate the first flow path FP1 and the second flow path FP2. According to this, the cooling gas flowing through the second flow path FP2 can be suppressed from flowing through the first flow path FP1 having a short flow path length. Therefore, the cooling gas that has cooled the wavelength conversion element 52 (substrate 521) can sufficiently receive heat from the cooling gas by flowing through the heat receiver 561A for a relatively long distance and time, thereby cooling the cooling gas more reliably. it can.

[Modification of Embodiment]
The present invention is not limited to the above embodiments, but includes modifications and improvements as long as the object of the present invention can be achieved.
Each of the wavelength converters 5 and 5A includes a reflection layer 523 that reflects the fluorescent light generated in the phosphor layer 522 by the excitation light being incident from the second pickup lens 49 on the second pickup lens 49. did. That is, the wavelength converters 5 and 5A are reflection-type wavelength converters that reflect the fluorescent light generated by the incidence of the excitation light. On the other hand, the wavelength conversion devices 5 and 5A may be configured as transmission wavelength conversion elements in which the generated fluorescent light is emitted along the traveling direction of the excitation light incident on the wavelength conversion element 52. . In this case, for example, instead of the reflective layer 523, a wavelength-selective reflective layer that transmits the excitation light and reflects the fluorescent light is disposed on the excitation light incident side with respect to the phosphor layer 522, and the substrate 521 transmits light. Fin 525 is not provided in a portion corresponding to the incident position of the excitation light on the surface 521B, and an opening through which the generated fluorescent light is emitted is provided on the side surface portion 51B on the + Z direction side. Is formed, the transmission type wavelength converter can be configured. In such a wavelength conversion device, the opening of the side surface 51B from which the fluorescent light is emitted is closed by a translucent member, so that the hermeticity of the housing 51 is maintained.

  In the wavelength conversion devices 5 and 5A, the rotation device 53 for rotating the wavelength conversion element 52 (substrate 521) is housed in the housing 51. On the other hand, for example, a motor body of a motor constituting the rotating device 53 is arranged outside the housing 51, and a spindle extending from the motor body and connected to the connection portion 524 of the substrate 521 is arranged inside the housing 51. May be.

The circulation device 55 is constituted by a sirocco fan arranged in the spaces S1 and S2, sucks the cooling gas flowing through the heat receiver 561 located in the space S4, and converts the wavelength converted in the space S3 through the space S2. It is assumed that a cooling gas flows through the element 52 (substrate 521). However, the distribution device 55 may be located anywhere in the housing 51, for example, in the space S2.
In addition, the circulation device 55 may not be a sirocco fan, and may have a configuration having another sending means such as an axial fan as long as the cooling gas can be caused to flow through the wavelength conversion element 52 (the substrate 521). .

The housing 51 has partition walls 513 to 515 that partition the storage space S in the housing 51 into spaces S1 to S4. However, the second partition 514 and the third partition 515 may not be provided. In this case, in the cooling gas circulation direction, the space from the circulation device 55 to the wavelength conversion element 52 is a first space, and the space from the wavelength conversion element 52 to the circulation device 55 is a second space. In addition, in the case where the housing 51 has the third partition 515 and the edge of the heat receiver 561 on the + Y direction side, further, the edge on the + X direction side and the −X direction side contacts the first partition 513. The first partition 513 does not have to be connected to the inner surface of the side surface 51F. Furthermore, if the cooling gas flowing through the wavelength conversion element 52 (substrate 521) does not collide with the cooling gas discharged from the wavelength conversion element 52, the first partition 513 may be omitted.
In addition, although the housing 51 is a sealed housing, the housing may not be a sealed housing.

  The opening shape of the opening 5131 of the first partition 513 is assumed to substantially match the rotation range of the substrate 521. That is, the center of the opening 5131 substantially matches the center C of the substrate 521 when viewed from the + Z direction side, and the inner diameter of the opening 5131 substantially matches the diameter of the substrate 521 during rotation. However, the inner diameter of the opening 5131 may be smaller than the diameter of the substrate 521 during rotation, and the center of the opening 5131 and the center C of the substrate 521 may be offset. Further, the size of the opening surface of the opening 5131 (the area of the virtual surface surrounded by the edge of the opening 5131) may be smaller or larger than the rotation range of the substrate 521. For example, if the cooling gas that has cooled the substrate 521 does not flow again to the surface 521B from the gap between the edge of the opening 5131 and the substrate 521, the inner diameter of the opening 5131 will be smaller when the substrate 521 rotates. May be larger than the diameter dimension of.

  In the substrate 521, a plurality of fins 525 extending outward from the center side of the substrate 521 were arranged on the surface 521B through which the cooling gas is circulated by the circulation device 55. On the other hand, if the gas that has cooled the substrate 521 can be radially discharged, such fins 525 may be omitted. Further, the shape of the fins 525 may not be a shape that warps in the direction opposite to the rotation direction (D direction) of the substrate 521 toward the outside. For example, each fin 525 may extend linearly from the center side to the outside.

In the housing 51, a heat receiver 561 that receives heat from the flowing cooling gas is arranged in the space S4, and heat conducted to the heat receiver 561 is arranged outside the housing 51 by a heat pipe 562 as a heat conducting member. Radiator 563. Such a heat receiver 561 may be arranged at another position, for example, may be arranged in the space S3. Further, the number of heat pipes 562 used as the heat conducting member can be changed as appropriate, and the same number of heat pipes 562 may be arranged in the first flow path FP1 and the second flow path FP2. Many heat pipes 562 may be arranged. In addition, a Peltier element (thermoelectric element) may be used instead of the heat pipe 562.
In addition, the heat receiver 561 has a first flow path FP1 through which the cooling gas in the space S2 flows, and a second flow path FP2 through which the cooling gas flows through the space S3 by cooling the wavelength conversion element 52. However, the invention is not limited thereto, and the first flow path FP1 may not be provided.

In the wavelength converters 5 and 5A, the contact area of the heat pipe 5622 as the second heat conductive member disposed in the second flow path FP2 with the heat receiver 561 is reduced by the first heat conductive member disposed in the first flow path FP1. The number of the heat pipes 5622 was larger than the number of the heat pipes 5621 in order to make the contact area of the heat pipe 5621 with the heat receiver 561 larger. On the other hand, the contact area with the heat receiver 561 may be adjusted by making the diameter of the heat pipe 5622 larger than that of the heat pipe 5621.
When the above-mentioned Peltier element is adopted as the heat conducting member, the contact area of the Peltier element arranged in the second flow path FP2 with the heat receiver 561 is adjusted by adjusting the size and number of the Peltier element. Alternatively, the contact area of the Peltier element arranged in the first flow path FP1 with the heat receiver 561 may be larger.

  The wavelength conversion devices 5 and 5A include a heat absorbing device 56 that lowers the temperature of the cooling gas circulating in the housing 51. The heat absorbing device 56 includes a heat receiver 561, 561A, a heat pipe 562, a radiator 563, and a cooling fan 564. Configuration. The configuration of the heat absorbing device 56 may be another configuration, and the heat absorbing device 56 may not be provided as long as the cooling gas having a relatively low temperature can be continuously supplied to the wavelength conversion element 52.

The cooling gas for cooling the wavelength conversion element 52 flows along the surface 521B of the substrate 521 in a direction opposite to the rotation direction of the substrate 521. On the other hand, when the wavelength conversion device has the first partition 513 that separates the cooling gas flowing through the substrate 521 from the cooling gas that has cooled the substrate 521, the flow direction of the cooling gas flowing through the substrate 521 Does not matter.
Further, similarly to the first partition 513, the wavelength conversion element 52 has an opening for guiding the cooling gas to the substrate 521, and the gas flowing from the rotating device 53 to cool the substrate 521 is supplied to the substrate 521. A configuration may be provided that includes a partition wall that suppresses the flow to the rotating device 53 again with the rotation of.

  When the wavelength conversion element 52 is viewed from the + Z direction side along the rotation axis RA, the housing 51 is located outside the wavelength conversion element 52 and is a circle centered on the center C of the wavelength conversion element 52. It has an arcuate portion 516 having a shape. Although the arc-shaped portion 516 has a function of assisting the flow of the cooling gas along the circumferential direction of the wavelength conversion element 52 during rotation, such an arc-shaped portion 516 may be omitted. Further, the arc-shaped portion 516 does not have to be formed in the above-mentioned circular shape, and may be formed in an arc shape such as a semicircular shape or a quarter circular shape.

  It is assumed that the discharge port 554 of the circulation device 55 is displaced toward the + X direction side with respect to the virtual line VL. On the other hand, the discharge port 554 may be shifted in the −X direction side with respect to the virtual line VL. In this case, the rotation direction of the wavelength conversion element 52 may be set to the direction opposite to the D direction. In addition, the discharge port 554 is arranged on the virtual line VL, and the discharge direction of the cooling gas from the discharge port 554 is inclined so as to be shifted toward the + X direction toward the wavelength conversion element 52 in the + Y direction. Is also good. When the rotation direction of the wavelength conversion element 52 is opposite to the direction D and the discharge port 554 is located on the virtual line VL, the discharge direction of the cooling gas by the discharge port 554 is set to + Y You may incline so that it may shift | deviate to the -X direction side as it goes to a direction.

  The attachment member 54 for attaching the rotating device 53 to the housing 51 is formed in a columnar shape, and is arranged inside the region where the plurality of fins 525 are formed on the substrate 521 when viewed from the + Z direction side. However, as described above, the shape of the mounting member 54 may be a prismatic shape or another shape. Further, the fixing position of the attachment member 54 with respect to the housing 51 is not limited to the inner surface of the side surface portion 51B, but may be any one of the inner surfaces of the side surface portions 51C to 51E or the second partition wall 514. That is, the position of the attachment member 54 when viewed from the + Z direction side is not limited to the inside of the region where the plurality of fins 525 are formed on the substrate 521, and may be arranged so that a part thereof covers the fin 525. .

The projector 1 includes three image forming apparatuses 34 (34R, 34G, 34B) each having a liquid crystal panel as a light modulation device. However, the present invention is also applicable to a projector having two or less or four or more image forming apparatuses.
Further, the image forming apparatus 34 uses a transmissive liquid crystal panel having a different light-incident surface and a different light-exit surface as the light modulator, but a reflective liquid-crystal panel in which the light-incident surface and the light-exit surface are the same. A panel may be used. In addition, any light modulator that can form an image corresponding to image information by modulating an incident light beam, such as a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device), etc. May be used.

Although the optical unit 3 has exemplified the configuration having the optical components and the arrangement illustrated in FIGS. 2 and 3, the invention is not limited thereto, and another configuration and arrangement may be adopted.
For example, in the illumination device 31, a part of the excitation light emitted from the light source unit 41 is separated by the first phase difference plate 44 and the polarization separation device 45, and the part of the excitation light is combined with the fluorescent light as blue light. To generate the illumination light WL. On the other hand, instead of separating a part of the excitation light emitted from the light source unit 41 and using it as blue light, another light source unit that emits blue light may be employed in addition to the light source unit 41. Good. In this case, the illumination light WL may be generated by combining the fluorescent light generated by the excitation light emitted from the light source unit 41 and the blue light emitted from the other light source unit. The separated green light LG and red light LR may enter the image forming apparatuses 34G and 34R, respectively, and the blue light emitted from the other light source unit may enter the image forming apparatus 34B.

  The wavelength converters 5 and 5A and the illumination device 31 have been applied to the projector 1. The wavelength converters 5 and 5A and the lighting device 31 can be applied to, for example, a lighting device or a light source device of an automobile.

DESCRIPTION OF SYMBOLS 1 ... Projector, 31 ... Lighting device, 34 (34B, 34G, 34R) ... Image forming device, 36 ... Projection optical device, 41 ... Light source part, 5, 5A ... Wavelength conversion device, 51 ... Housing, 51A, 51B, 51E, 51F: Side surface portion, 513: First partition (partition), 5131, 5132: Opening, 514: Second partition, 5141, 5142: Opening, 515: Third partition, 5151: Opening, 52: Wavelength Conversion element, 521: substrate, 521B: surface, 522: phosphor layer, 523: reflection layer, 524: connection portion, 525: fin, 53: rotating device, 54: mounting member, 55: distribution device, 56: heat absorption device , 561, 561A ... heat receiver, 5612 ... partition part, 562 ... heat pipe (heat conduction member), 5621 ... heat pipe (first heat conduction member), 5622 ... heat pipe (second heat conduction member) , FP1 ... first flow channel, FP2 ... second flow channel, RA ... rotation axis, S ... accommodation space, S1, S2, S3, S4 ... space.

Claims (11)

A substrate having a phosphor layer containing a phosphor,
A rotating device for rotating the substrate,
A flow device for flowing a cooling gas through the substrate,
A housing that houses the substrate and the distribution device;
A heat absorbing device that absorbs heat of the cooling gas,
With
The casing includes a partition that separates a first space through which the cooling gas flows through the substrate by the flow device and a second space through which the cooling gas radially sent from the substrate by rotation of the substrate flows. Yes, and
The heat absorbing device is disposed on the intake side of the circulation device, and has a heat receiver that receives heat from the flowing cooling gas,
Wherein the heat receiver has a first flow path through which the cooling gas flows in the first space, and a second flow path through which the cooling gas flows in the second space. apparatus. The wavelength converter according to claim 1,
The partition has an opening through which the cooling gas flows through the substrate,
The wavelength converter according to claim 1, wherein an opening shape of the opening substantially coincides with a rotation range of the substrate. The wavelength converter according to claim 1 or 2,
The wavelength conversion device, wherein the substrate has a plurality of first fins extending outward from a center side of the substrate on a surface to which the cooling gas is blown. The wavelength converter according to claim 3,
The wavelength conversion device according to claim 1, wherein each of the plurality of first fins has a shape that warps in a direction opposite to a rotation direction of the substrate as going outward from a center side of the substrate. The wavelength converter according to any one of claims 1 to 4 ,
The wavelength conversion device, wherein the heat absorbing device includes a heat conducting member connected to the heat receiving device and configured to conduct heat conducted to the heat receiving device to outside the housing. The wavelength converter according to claim 5 ,
The heat conduction member,
A first heat conduction member disposed in the first flow path through which the cooling gas flows from the first space;
A second heat conduction member disposed in the second flow path through which the cooling gas from the second space flows;
Including
The wavelength converter, wherein the second heat conductive member has a larger contact area with the heat receiver than the first heat conductive member. The wavelength converter according to claim 5 or 6 ,
The heat receiver has a plurality of second fins connected to the heat conducting member,
The wavelength conversion device, wherein the first flow path and the second flow path are formed by the plurality of second fins. The wavelength converter according to any one of claims 1 to 7 ,
The wavelength converter, wherein the heat receiver has a partition connected to the partition to separate the first flow path and the second flow path. The wavelength converter according to any one of claims 1 to 8 ,
The wavelength converter according to claim 1, wherein the housing is a closed housing. A wavelength converter according to any one of claims 1 to 9 ,
A light source unit that emits light incident on the wavelength conversion device,
A lighting device comprising: The lighting device according to claim 10 ,
An image forming apparatus that forms an image using light emitted from the illumination device,
A projection optical device for projecting the formed image,
A projector comprising: