JP6686364B2 - Wavelength conversion device, lighting 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, there is known 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. As such a projector, there is known a projector including a fluorescent light emitting device that emits fluorescent light by being 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 layer of a green phosphor is formed and a diffuse transmission region for diffusing and transmitting the blue emitted light from the blue light source device are arranged side by side in the circumferential direction. Has 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 fluorescence emission region, whereby a light flux (green light) in the green wavelength band is generated, and a part of the laser light is emitted. By entering the diffuse transmission region, diffuse transmission light (blue light) in the blue wavelength band is generated. Further, the light in the red wavelength band (red light) emitted from the red light source device follows the optical paths of the blue light and the green light by a dichroic mirror or the like, and these color lights are sequentially incident on the display element, thereby forming an image. Is formed.

  Since the high-power laser light emitted from the blue light source device is incident on the fluorescent light emitting region and the diffuse transmission region, the temperature of these regions rises. In addition, a wheel motor that rotates a fluorescent wheel in which these regions are arranged in parallel is also a heat source. Therefore, 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 the cooling air cools the fluorescent wheel and the wheel motor.

JP, 2011-75898, A

  However, in the projector described in Patent Document 1, since the cooling air flows along the rotation axis of the fluorescent wheel, the cooling air blown on the fluorescent wheel diffuses. Therefore, there is a problem that it is difficult to conduct the heat of the fluorescent wheel, that is, the heat generated in the fluorescent light emitting region to the cooling air, and it is difficult to cool the fluorescent light emitting region.

  The present invention is intended to solve at least a part of the above problems, and an object thereof is to provide a wavelength conversion device, a lighting device, and a projector that can improve cooling efficiency.

  A wavelength conversion device according to a first aspect of the present invention is a substrate having a phosphor layer containing a phosphor, a rotating device for rotating the substrate, a flow device for circulating a cooling gas through the substrate, the substrate, and A casing that houses the circulation device is provided, and the cooling gas that is circulated by the circulation device is a part in the circumferential direction of the substrate when the substrate is viewed along the rotation axis of the substrate. And flowing in a direction opposite to the rotation direction of the substrate in the part.

  According to the first aspect, when viewed along the rotation axis of the substrate, the cooling gas circulated by the circulation device is a part of the substrate in the circumferential direction, and the rotation direction of the substrate is part of the cooling gas. Circulate in the opposite direction. According to this, since the cooling gas flows along the surface of the substrate, the time period during which the cooling gas is in contact with the surface of the substrate is longer than that in the case where the cooling gas is blown onto the substrate along the rotation axis. You can In addition, since the cooling gas flows in the above-mentioned part in the direction against the rotation of the substrate, the flow velocity of the cooling gas relative to the substrate can be increased. Therefore, the substrate can be cooled efficiently.

In the first aspect, the housing may have an arcuate portion that is located outside the substrate when the substrate is viewed along the rotation axis and that extends along the circumferential direction of the substrate when the substrate rotates. preferable.
According to such a configuration, the cooling gas that circulates in the substrate can circulate in the circumferential direction of the substrate along the arcuate portion. Therefore, in the part in the circumferential direction of the substrate, by rotating the substrate in the direction opposite to the flowing direction of the cooling gas, the cooling gas can be reliably flowed in the direction opposite to the rotating direction of the substrate. . Therefore, the substrate can be surely and efficiently cooled.

In the first aspect, the circulation device has a discharge port for discharging the cooling gas, the discharge port passes through the center of the substrate when the substrate is viewed along the rotation axis, and It is preferable that they are arranged so as to be displaced from an imaginary line intersecting the arcuate portion.
According to such a configuration, since the discharge port is arranged so as to be displaced with respect to the virtual line, the cooling gas discharged from the discharge port is distributed while being biased to one side of the substrate with respect to the virtual line. be able to. Therefore, since the cooling gas easily flows along the arcuate portion, by rotating the substrate such that the flowing direction of the cooling gas and the rotation direction of the substrate in the part are opposite to each other, The cooling gas can be more reliably circulated in the direction opposite to the rotation direction of the substrate. Therefore, the effects described above can be more reliably achieved.

In the first aspect, there is an attachment member that is disposed in the housing and that attaches the rotating device to the housing, and the substrate has a center of the substrate on a surface through which the cooling gas flows from the flow device. A plurality of fins extending from the side toward the outside, and the mounting member is a position closer to the center of the substrate than the plurality of fins in the substrate when the substrate is viewed along the rotation axis. Are preferably arranged in
According to such a configuration, since each of the plurality of fins extends outward from the center side of the substrate, the cooling gas can be easily discharged radially by the rotation of the substrate. It is possible to suppress stagnation of the heated cooling gas around the substrate by cooling the substrate.
Further, in the above part of the substrate, the flow direction of the cooling gas and the rotation direction of the substrate are opposite to each other, so that the cooling gas can be made to collide so as to face each fin. Therefore, each fin can be efficiently cooled by the cooling gas, and the phosphor can be efficiently cooled.
Further, by disposing the mounting member at the above position, it is possible to prevent the plurality of fins from being covered by the mounting member. As a result, the flow of the cooling gas flowing through each fin can be prevented from being hindered by the mounting member, and the cooling gas can be reliably flowed along the surface of the substrate on which the plurality of fins are located.

In the first aspect, the mounting member preferably has a columnar shape.
The columnar shape is preferably a columnar shape or a polygonal shape. In the case of a polygonal shape, it is preferable that the number of corners is large.
According to such a configuration, even when a part of the cooling gas flows along the mounting member, the flow of the cooling gas is hindered as compared with, for example, the case where the mounting member projects toward the flow path of the cooling gas. Can be suppressed. Therefore, the cooling gas can be smoothly passed through the substrate.

In the first aspect, the housing is a partition wall that separates a first space in which the cooling gas flows through the substrate by the flow device and a second space in which the cooling gas radially discharged from the substrate flows. It is preferable to have
According to such a configuration, the cooling gas flowing toward the substrate and the cooling gas discharged from the substrate can be separated from each other, so that the cooling gases can be prevented from colliding with each other. Therefore, each cooling gas can be reliably flowed. In addition, the cooling gas discharged from the substrate can be prevented from flowing again to the substrate while still being heated, so that the cooling efficiency of the substrate, and thus the phosphor, can be improved.

In the first aspect, it is preferable that the housing is a closed housing.
Here, when a relatively strong excitation light is incident on the phosphor layer, a phenomenon called light collection is likely to occur. As described above, if the dust is easily collected, the efficiency of use of the excitation light is lowered, and the possibility of the malfunction of the rotating device is increased.
On the other hand, according to the above configuration, it is possible to prevent dust from entering the housing. Therefore, it is possible to suppress a decrease in the utilization efficiency of the excitation light and to configure a highly reliable wavelength conversion device.

In the first aspect, it is preferable to include a heat absorbing device that absorbs the heat of the cooling gas.
With such a configuration, the heat of the cooling gas is absorbed by the heat absorbing device, so that the temperature of the cooling gas flowing through the substrate can be lowered. Therefore, the cooling efficiency of the substrate can be further increased.

An illumination device according to a second aspect of the present invention is characterized by including the wavelength conversion device 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 lighting device, an image forming device that forms an image using light emitted from the lighting device, and a projection optical device that projects the formed image. It is characterized by being provided.
According to the third aspect, the same effect as that of the illumination device according to the second aspect can be obtained.

1 is a schematic perspective view showing a projector according to an embodiment of the present invention. The schematic diagram which shows the structure of the projector in the said embodiment. The schematic diagram which shows the structure of the illuminating device in the said embodiment. The perspective view which shows the external appearance of the wavelength converter in the said embodiment. Sectional drawing which shows the wavelength converter in the said embodiment. Sectional drawing in the AA line of the wavelength converter shown in FIG. Sectional drawing in the BB line of the wavelength converter shown in FIG. The schematic diagram which shows the flow of the cooling gas in the housing | casing in the said embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
[Schematic configuration of projector]
FIG. 1 is a schematic perspective view showing a projector 1 according to this embodiment.
The projector 1 according to the present embodiment is a projection-type display that modulates light emitted from a lighting device 31 described below to form an image according to image information, and enlarges and projects the image on a projection surface such as a screen. It is a device. As shown in FIG. 1, the projector 1 includes an exterior housing 2 that constitutes an exterior.
As will be described later in detail, the projector 1 includes a wavelength conversion device 5 that constitutes the illumination device 31, and the wavelength conversion device 5 accommodates the wavelength conversion element 52, the circulation device 55, and the heat absorption device 56 inside. One of the features is that the phosphor layer 522 included in the wavelength conversion element 52 is cooled by causing the circulation device 55 to circulate the cooling gas in the casing 51. There is.
The configuration of the projector 1 will be described below.

[External housing configuration]
The exterior housing 2 is formed in a substantially rectangular parallelepiped shape, and the exterior housing 2 includes 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 portion 21 is provided with a pair of grip portions 211, and the bottom surface portion 22 is provided with legs, which are not shown in the drawing, which come into contact with a mounting surface on which the projector 1 is mounted. Further, the front surface portion 23 is formed with an opening portion 231 for exposing a part of a projection optical device 36 described later. Further, although not shown, the right side surface portion 26 is formed with an inlet for introducing outside air, and the left side surface portion 25 is formed with an exhaust port for discharging the air circulating in the exterior housing 2. There is.

FIG. 2 is a schematic diagram showing the configuration of the projector 1 according to the present embodiment.
In addition to the exterior housing 2, the projector 1 includes, as shown in FIG. 2, an optical unit 3 which is an image projection device housed in 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 electric power to electronic components.

[Optical unit configuration]
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 synthesizing device 35, and a projection optical device 36.
Of these, the lighting device 31 emits the illumination light WL. The configuration of the lighting device 31 will be described in detail later.

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 collimating 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). Further, the separated red light LR is guided to the collimating 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 red, green, and blue light are 33R, 33G, and 33B, respectively) and collimates the incident light.

  The image forming device 34 (the image forming devices for red, green, and blue color lights are 34R, 34G, and 34B, respectively) modulates the incident color lights LR, LG, and LB to generate image information. Image light is formed by the corresponding color lights LR, LG, LB. Each of the image forming devices 34 includes, for example, a liquid crystal panel as a light modulator that modulates incident light, and a pair of polarizing plates arranged on the incident side and the emitting side of the liquid crystal panel. To be done.

The color combining device 35 combines the image lights of the respective color lights LR, LG, LB that are incident from the image forming devices 34R, 34G, 34B. Such a color synthesizing device 35 is configured by a cross dichroic prism in this embodiment.
The projection optical device 36 magnifies and projects the image light combined by the color combining device 35 onto the projection surface such as the screen SC1. As such a projection optical device 36, for example, a combined lens including 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 showing the 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 illumination device 31 has a light source device 4 and a homogenizing 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, The second pickup lens 49 and the wavelength conversion device 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 separation device 45, the second retardation plate 46, the first pickup lens 47, and the diffuse reflection element 48 are the illumination optical axis Ax1. It is placed on top. The polarization separation device 45 is arranged 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 has a plurality of LDs (Laser Diodes) 411 and a collimating lens 412 corresponding to each LD 411, and emits excitation light that is blue light toward the afocal optical system 42. In the present embodiment, each LD 411 emits excitation light having a peak wavelength of 440 nm, for example. However, an LD that emits excitation light having a peak wavelength of 446 nm may be adopted, and excitation of peak wavelengths of 440 nm and 446 nm may be adopted. 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 this embodiment, the excitation light emitted from each LD 411 is S-polarized light.
The afocal optical system 42 adjusts the luminous flux 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 makes uniform the illuminance distribution of the excitation light in the illuminated regions of the diffuse reflection element 48 and the wavelength conversion device 5 in cooperation with the pickup lenses 47 and 49 described later. The homogenizer optical system 43 includes a pair of multi-lens arrays 431 and 432, each having a plurality of small lenses arranged in a matrix in a plane orthogonal to the optical axis. The excitation light emitted from the homogenizer optical system 43 enters the first retardation plate 44.
The first retardation plate 44 is a half-wave plate. The first retardation plate 44 converts a part of the S-polarized light into P-polarized light in the process of transmitting the incident excitation light. As a result, the excitation light that has entered 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 together at the interface corresponding to the hypotenuse, thereby forming a substantially rectangular parallelepiped shape. There is. This interface is inclined by approximately 45 ° with respect to each of the illumination optical axis Ax1 and the illumination optical axis Ax2. A polarization separation layer 453 is formed on the interface of the prism 451 located on the first phase difference plate 44 side (that is, the light source unit 41 side) in the polarization separation device 45.
The polarization separation layer 453 has a wavelength-selective polarization separation characteristic. Specifically, the polarization separation layer 453 has a property of reflecting one of the S-polarized light and the P-polarized light included in the excitation light and transmitting the other, thereby separating the polarized light. Further, the polarization separation layer 453 has a property of transmitting the fluorescent light generated in the wavelength conversion device 5 regardless of the polarization state.
Of the excitation light incident from the first retardation plate 44, the P-polarized light is transmitted to the second retardation plate 46 side along the illumination optical axis Ax1 by the polarization separation device 45, and the S-polarized light is transmitted. Is reflected toward the second pickup lens 49 side along the illumination optical axis Ax2.

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

The diffuse reflection element 48 diffuse-reflects the incident excitation light as well as the fluorescent light generated and reflected by the wavelength conversion device 5 described later. As the diffuse reflection element 48, a reflection member that Lambert-reflects an incident light beam can be exemplified.
The excitation light diffusely reflected by the diffuse reflection element 48 is incident on the second retardation plate 46 again via the first pickup lens 47. The polarization direction of the excitation light is further rotated in the process of passing 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 enters the homogenization device 6.

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

  The wavelength conversion device 5 produces fluorescent light by the incident excitation light. The fluorescent light generated by such a 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 the wavelength-selective polarization separation characteristics as described above, the fluorescence light passes through the polarization separation layer 453 and the homogenization device 6 Is incident on. The configuration of the wavelength conversion device 5 will be described in detail later.

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 at the same time, the second retardation plate 46. Is converted into S-polarized light in the process of being transmitted twice and is reflected by the polarization separation device 45 toward the homogenizing device 6 side.
On the other hand, the S-polarized light of the excitation light is wavelength-converted into fluorescent light by the wavelength conversion device 5, and then emitted to the homogenizing device 6 side via the polarization separation device 45.
That is, the blue light and the fluorescent light (light including the green light and the red light) that are a part of the excitation light are combined by the polarization separation device 45 and are incident on the homogenization device 6 as white illumination light WL. It

[Configuration of homogenizer]
The homogenizing device 6 shown in FIG. 3 homogenizes the illuminance in the plane orthogonal to the optical axis of the light flux incident on each image forming device 34 (34R, 34G, 34B) that is an illuminated region, and also aligns the polarization direction. Have a function. The homogenizing device 6 includes a first lens array 61, a second lens array 62, a polarization conversion element 63, and a superimposing 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 the incident light flux (illumination light WL) into a plurality of partial light fluxes.
The second lens array 62 has a configuration in which the 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 the plurality of partial light beams split by the first lenses 611 on the image forming devices 34 together with the superimposing lenses 64.
The polarization conversion element 63 is arranged between the second lens array 62 and the superposing lens 64, and aligns the polarization directions of the plurality of partial light beams. The illumination light WL formed by a plurality of partial light fluxes whose polarization directions are aligned by the polarization conversion element 63 is incident on the color separation device 32 via the superimposing lens 64.

[Configuration of wavelength converter]
FIG. 4 is a perspective view showing the appearance of the wavelength conversion device 5, and FIG. 5 is a sectional view showing the wavelength conversion device 5. Further, FIG. 6 is a sectional view taken along the line AA of the wavelength conversion device 5 in FIG. 5, and FIG. 7 is a sectional view taken along the line BB of the wavelength conversion device 5 in FIG.
As shown in FIGS. 3 to 7, the wavelength conversion device 5 includes a housing 51, and as shown in FIGS. 4 to 7, the wavelength conversion element 52 and the rotation device arranged in the housing 51, respectively. 53, a mounting member 54, and a circulation device 55, and a heat absorbing device 56 in which a part of the structure is arranged inside the housing 51 and the other structure is arranged outside the housing 51.
Of 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 structure of such a heat absorbing device 56 will be described in detail later.

  In the following description, the traveling direction of the excitation light with respect to the wavelength conversion device 5 is the + Z direction, and the directions orthogonal to the + Z direction and mutually orthogonal are the + X direction and the + Y direction. Of these, the + X direction is the direction in which the radiator 563 is located with respect to the housing 51, the + Y direction is orthogonal to the + Z direction and the + X direction, and when viewed from the + Z direction side, the circulation device 55 and the heat receiving unit The direction from the container 561 to the wavelength conversion element 52 is set. Further, for convenience of explanation, the direction opposite to the + Z direction is defined as the −Z direction. The same applies to the -X direction and the -Y direction.

[External configuration of chassis]
The housing 51 is a hermetically sealed housing in which a storage space S for housing the wavelength conversion element 52, the rotation device 53, the attachment member 54, the circulation device 55, and the heat receiver 561 forming the heat absorption device 56 is formed. is there. As shown in FIG. 4, the housing 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 casing 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 the plurality of lenses forming the second pickup lens 49 is fitted is formed in the side surface portion 51A.
The side surface portion 51C is formed with a plurality of holes 512 through which a heat pipe 562 that constitutes a heat absorbing device 56 described later is inserted.
The side surface portion 51E is a portion formed in an arc shape when viewed from the −Z direction side.

[Internal structure of case]
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 and form the spaces S1 to S4.
The first partition wall 513 is formed inside the housing 51 at a position spaced apart from the side surface portion 51A by a predetermined distance along the XY plane so as to be connected to the inner surfaces of the side surface portions 51C to 51F. In the space S3 (second space) surrounded by the first partition wall 513 and the inner surfaces of the side surface portions 51A and 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 part of the heat receiver 561 on the −Z direction side are arranged at a position on the −Y direction side.

An opening 5131 is formed in the first partition wall 513 at a position corresponding to the wavelength conversion element 52. The opening shape of the opening 5131 substantially matches the rotation range of the substrate 521, as shown in FIGS. 6 and 7. That is, the opening 5131 is formed in a substantially circular shape corresponding 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. It almost matches. Then, the center position of the opening 5131 and the center position of the wavelength conversion element 52 (substrate 521) substantially coincide with each other.
As shown in FIG. 7, a substantially rectangular opening 5132 that substantially matches the outer shape of the heat receiver 561 is formed in the −Y direction side portion of the first partition wall 513. The opening area of the opening 5132 is substantially the same as 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 wall 514 is formed on the + Z direction side of the first partition wall 513 and at a substantially central position in the + Y direction of the housing 51 along the XZ plane. That is, the second partition wall 514 is connected to the first partition wall 513 so as to be substantially orthogonal to the first partition wall 513, and is also connected to the inner surfaces of the side surface portions 51B to 51D. In the space S2 (first space) surrounded by the second partition wall 514, the first partition wall 513, and the inner surfaces of the side surface portions 51B to 51E, the + Z direction side portion of the rotating device 53 and the mounting member 54 are provided. In addition to being arranged, as shown in FIG. 6, a part of the distribution device 55 on the + Y direction side is arranged.
As shown in FIGS. 6 and 7, the inside of the side surface portions 51C to 51E is centered on the center C of the wavelength conversion element 52 (center C of the substantially circular substrate 521) when viewed from the + Z direction side. An arcuate portion 516 formed in a substantially circular shape is formed outside the wavelength conversion element 52, and the arcuate portion 516, the + Y direction side surface of the second partition wall 514, and the inner surface of the side surface portion 51B. The space S2 is formed by and. Therefore, the space S2 is a substantially circular space when viewed from the + Z direction side.

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

As shown in FIG. 5, an opening 5141 for communicating the spaces S2, S4 is formed in the second partition wall 514 at a position corresponding to the heat receiver 561.
Further, an opening 5151 that connects the space S4 and the space S1 is formed at a position corresponding to the heat receiver 561 and the intake port 552 of the circulation device 55 in the approximate center of the third partition wall 515.
Further, as shown in FIG. 5 and FIG. 6, in the second partition wall 514, the opening 5141 of the flow device 55 is arranged at the position on the + Z direction side of the opening 5141 and on the + X direction side. The 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 arranged in the space S3 so that a predetermined gap is formed between the wavelength conversion element 52 and the inner surface of the side surface portion 51A.
As shown in FIGS. 3 and 5, such a wavelength conversion element 52 has a substrate 521 rotated by a rotation device 53 described later, and the substrate 521 includes a phosphor layer (wavelength conversion layer) 522 and reflection. It has a layer 523, a connection portion 524, and a plurality of fins 525.
Of these, the substrate 521 is formed in a substantially circular shape when viewed from the + Z direction side, as shown in FIGS. 6 and 7. The substrate 521 is formed of a member having thermal conductivity, and is formed of metal in this embodiment.

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

The connecting portion 524 and the plurality of fins 525 are located on the surface 521B on the opposite side (+ Z direction side) from the surface 521A, as shown in FIGS.
The connecting portion 524 is located in the center of the surface 521B and is a portion to which the rotating device 53 is connected.
The plurality of fins 525 are formed around the connecting portion 524. More specifically, the plurality of fins 525 are formed in the area outside the connecting portion 524 on the surface 521B so as to respectively extend outward from the 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, but as they extend outward, the fins 525 face the opposite side to the direction of rotation (D direction) of the substrate 521 by the rotation device 53. Is formed in a curved arc shape. That is, the fins 525 do not extend radially, but are formed in a spiral shape that swirls in a direction opposite to the D direction to the extent that the substrate 521 is not half-circled. The heat generated in the phosphor layer 522 is conducted to the fins 525 through the substrate 521. Then, the fins 525 undergo heat exchange with a cooling gas that is circulated by a circulation device 55 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 around the rotation axis RA passing through the center C of the wavelength conversion element 52 and extending in the + Z direction. The rotating 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 the counterclockwise direction. Due to 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 the site where heat is generated is dispersed in the phosphor layer 522, and the phosphor layer 522 is heated. Generation of high heat locally is suppressed, and heat exchange with the cooling gas is promoted.

[Structure 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 51B of the housing 51 on the + Z direction side, whereby the rotating device 53 is mounted in the housing 51. As shown in FIGS. 6 and 7, the attachment member 54 is formed in a cylindrical shape having a central axis along the + Z direction so as not to hinder the flow of the cooling gas discharged by the flow device 55 described later. Besides, it is arranged so as to be located inside the fin 525 as viewed from the + Z direction side. The mounting member 54 may be formed in a prismatic shape, and in this case, the cross section of the mounting member 54 has a polygonal shape with more corners in terms of not obstructing the flow of the cooling gas. Preferably there is.

[Structure of distribution device]
The circulation device 55 circulates the cooling gas in the housing 51 and circulates the cooling gas in the wavelength conversion element 52 (specifically, the plurality of fins 525). The distribution device 55 is composed of a sirocco fan in this embodiment.
As shown in FIGS. 5 and 6, the distribution device 55 is arranged across the spaces S1 and S2. Specifically, in the distribution device 55, the intake port 552 that is located on the surface 551 that is in contact with the third partition wall 515 and sucks the cooling gas is located at a position corresponding to the opening 5151 of the third partition wall 515. , And is disposed to face the third partition wall 515. Then, in the distribution 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.
The cooling gas sucked from the space S4 in which the heat receiver 561 described later is located by such a circulation device 55 is discharged from the discharge port 554 located in the space S2 and circulates in the space S2. It is circulated to the surface 521B of the wavelength conversion element 52 via the 5131.

Here, as shown in FIG. 6, the discharge part 553 (discharge port 554) passes through the center C of the wavelength conversion element 52 and extends in the + Y direction so as to intersect the arc-shaped part 516. It is arranged so as to be displaced in the + X direction with respect to the virtual line VL. Therefore, as shown by the arrow AL when viewed from the + Z direction side, the cooling gas is biased toward the + X direction side with respect to the wavelength conversion element 52 and is discharged from the discharge port 554, and then the arc-shaped portion 516 and the wavelength conversion element. It circulates clockwise along the surface 521B of 52. That is, the flow direction of the cooling gas flowing along the surface 521B is opposite to the rotation direction of the substrate 521. Then, the cooling gas is taken into the plurality of fins 525, cools the plurality of fins 525, and is then radially discharged into the space S3 by the rotation of the substrate 521.
The cooling gas that has cooled the wavelength conversion element 52 circulates in the space S3 toward the −Y direction side by the suction force of the circulation device 55, and circulates in the heat receiver 561 forming the heat absorption device 56.

[Structure of heat absorbing device]
The heat absorbing device 56 absorbs heat from the cooling gas that circulates in the casing 51 by the circulation device 55 and releases the absorbed heat to the outside of the casing 51 to lower the temperature inside the casing 51. As shown in FIGS. 5 and 7, the heat absorbing device 56 includes a heat receiver 561 (FIGS. 6 and 7) and a plurality of heat pipes 562, and as shown in FIG. The radiator 563 and the cooling fan 564 are provided.

The heat receiver 561 receives (absorbs) the heat of the cooling gas, and is arranged so as to straddle the spaces S3 and S4 in the housing 51 as described above. More specifically, as shown in FIG. 5, in the heat receiver 561, a portion on the −Z direction side is fitted into the opening 5132, and an end on the + Z direction side is a −Z direction side surface of the third partition wall 515. Is in contact with. As described above, substantially 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 is configured by a plurality of plate-shaped fins 5611 extending in 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 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 edges of the opening 5132 of the first partition wall 513. Further, the second partition wall 514 located on the + Y direction side with respect to the heat receiver 561 and substantially orthogonal to the first partition wall 513 has an opening 5141 at a position corresponding to the heat receiver 561. Therefore, due to the suction force of the flow device 55, 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 first flow path FP1 flowing to the flow device 55 side and the cooling gas that has cooled the wavelength conversion element 52 from the space S3 flow in. And a second flow path FP2 that circulates to the distribution device 55 side.
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 passage length capable of sufficiently receiving heat from the cooling gas having a relatively high temperature flowing through the second flow passage FP2.

  The plurality of heat pipes 562 (5621, 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 these heat pipes 562 is connected to the heat receiver 561 inside the housing 51, and the other end thereof is connected to the radiator 563 outside the housing 51 as shown in FIG. It In this embodiment, three heat pipes 562 are provided, but the number of heat pipes 562 can be appropriately changed.

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 passage FP2 is higher than the amount of heat conducted to the first flow passage FP1. From this, it is necessary to efficiently conduct the heat conducted from the first flow passage FP1 to the second flow passage FP2 to the outside of 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 transfers the heat conducted in the second flow passage FP2 to the outside of the housing 51) contacts the heat receiver 561. The area is made larger than the contact area of the heat pipe 562 provided in the first flow passage FP1 (the heat pipe 562 that conducts the heat conducted in the first flow passage FP1 to the outside of the housing 51) to the heat receiver 561. .
Specifically, the number of heat pipes 5622 provided in the second flow passage FP2 is larger than the number of heat pipes 5621 provided in the first flow passage 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. Thereby, the heat conducted to the first flow passage FP1 and the second flow passage FP2 can be efficiently conducted to the outside of the housing 51 with a small number of heat pipes 562.

As shown in FIG. 4, the radiator 563 radiates the heat of the heat receiver 561 conducted through the heat pipe 562 outside the housing 51. 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 so as to penetrate the fins 5631.
The cooling fan 564 circulates a cooling gas (outside air introduced into the exterior housing 2) in the radiator 563 to release the heat conducted to the radiator 563, and is configured by an axial fan in this embodiment. Has been done. When the cooling fan 564 is driven, the cooling gas is sucked, the cooling gas is supplied to the radiator 563, and the radiator 563 is cooled. The cooling gas used to cool the radiator 563 is sucked and discharged by the cooling fan 564, and is discharged to the outside of the outer casing 2 by the fan (not shown) through the exhaust port formed in the outer casing 2. Is discharged. The cooling fan 564 may be composed of a sirocco fan.

[Circulation channel for cooling gas in the housing]
FIG. 8 is a schematic diagram showing the circulation flow 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 from the circulation device 55 located in the space S1 into the space S2 is 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 through the surface 521B through 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 each fin 525, and thus the phosphor layer 522, is cooled.

The cooling gas that has cooled the wavelength conversion element 52 is, as shown by an arrow F2, rotated by the rotation device 53 of the wavelength conversion element 52, and radially between the fins 525 when viewed from the + Z direction side with the center C as the center. Is released into the space S3.
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 wall 513, while the suction force of the flow device 55 causes −Y in the space S3. 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 circulation device 55 through the opening 5151 that connects the space S4 and the space S1.
Further, 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 located in the space S4 through the opening 5141 of the second partition 514 along the arrow F4. To be done. Then, the part of the cooling gas flows through the first flow path FP1 and flows into the flow device 55 through the opening 5151. As a result, the temperature of the cooling gas discharged from the circulation device 55 and flowing to the wavelength conversion element 52 can be further lowered.
As described above, the heat conducted to the heat receiver 561 is conducted to the radiator 563 via the heat pipe 562 and is emitted to the outside of the housing 51.

[Effect of Embodiment]
The projector 1 according to this embodiment described above has the following effects.
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 a part of the circumferential direction of the substrate 521 (for example, from the center C to + X). In the portion 521C located on the side of the direction and the portion 521D located on the side of the + Y direction), the fluid flows in the direction opposite to the rotation direction of the substrate 521 in 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 lengthened. In addition to this, since the cooling gas flows in the direction in which the rotation of the substrate 521 is resisted in the above part, the relative flow velocity of the cooling gas with respect to the substrate 521 can be increased. Therefore, the substrate 521, and hence 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 casing 51 is located outside the substrate 521 and has an arcuate portion 516 along the circumferential direction when the substrate 521 rotates. . According to this, the cooling gas that circulates in the substrate 521 can circulate in the circumferential direction along the arcuate portion 516. Therefore, by rotating the substrate 521 in the D direction, the cooling gas can surely 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 distribution device 55 is arranged along the direction orthogonal to the rotation axis RA and displaced from the virtual line VL that passes through the rotation axis RA and intersects the arcuate portion 516. According to this, the cooling gas discharged from the discharge port 554 can be biased in the substrate 521 toward the arrangement side of the discharge port 554 with respect to the virtual line VL to facilitate the circulation. Therefore, at the portion 521C, the cooling gas can surely flow in the direction opposite to the rotation direction of the substrate 521, and the cooling gas can easily flow along the arc-shaped portion 516. The cooling gas can be more reliably circulated in the direction opposite to the rotation direction of the substrate 521. Therefore, the effects described above can be more reliably achieved.

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. In addition, a mounting member 54 for mounting the rotating device 53 on the inner surface of the side surface portion 51B is provided in the housing 51, and the mounting member 54 is provided when the substrate 521 is viewed from the + Z direction side along the rotation axis RA. In the substrate 521, the fins 525 are arranged closer to the center of the substrate 521 than the fins 525.
According to this, since each of the plurality of fins 525 extends outward from the center side of the substrate 521, it is possible to easily discharge the cooling gas radially by the rotation of the substrate 521. Thus, the cooling gas that has cooled the substrate 521 and is heated can be prevented from staying around the substrate 521.
Further, in some of the portions (for example, the portion 521C and the portion 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 so as to face each fin 525. it can. Therefore, the fins 525 can be efficiently cooled by the cooling gas, and the phosphor can be efficiently cooled.
Further, since the mounting members 54 are located closer to the center C than the fins 525, it is possible to prevent the mounting members 54 from covering the fins 525. As a result, the flow of the cooling gas flowing through each fin 525 can be suppressed from being obstructed by the mounting member 54, and the cooling gas can be reliably flowed along the surface 521B.

  The mounting member 54 is formed in a cylindrical shape. According to this, even when a part of the cooling gas flows along the mounting member 54, it is possible to suppress the obstruction of the flow of the cooling gas as compared with the case where the mounting member projects toward the flow path of the cooling gas, for example. . Therefore, the cooling gas can be smoothly passed through the substrate 521.

In the case 51 in which the wavelength conversion element 52 having the substrate 521 and the circulation device 55 are housed, the cooling gas is discharged from the space S2 (first space) on the delivery side of the cooling gas to the substrate 521 and the substrate 521. The first partition wall 513 is provided to separate the space S3 (second space).
According to this, it is possible to prevent the cooling gas radially discharged from the substrate 521, that is, the cooling gas that has cooled the substrate 521, from flowing to the space S2 side while keeping heat 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 wall 513, it is possible to suppress collision of these cooling gases. Therefore, each cooling gas can be reliably flowed.

Here, when relatively strong excitation light is incident on the phosphor layer 522, a phenomenon called light collecting is likely to occur. As described above, if the dust is easily collected, the utilization efficiency of the excitation light is reduced, and the possibility that the rotation device 53 rotates the substrate 521 may be increased.
On the other hand, since the case 51 is a closed case, it is possible to prevent dust from entering the case 51. Therefore, it is possible to suppress the decrease in the utilization efficiency of the excitation light and to configure the highly reliable wavelength conversion device 5.

The wavelength conversion device 5 includes a heat absorption device 56 that is disposed in the housing 51 and has a heat receiver 561 that receives the heat of the cooling gas that flows. According to this, since the heat of the cooling gas used for cooling the substrate 521 is conducted to the heat receiver 561, it is possible to cool the cooling gas sucked by the circulation device 55 and flowing to the substrate 521.
Further, the heat receiver 561 has the first flow path FP1 and the second flow path FP2. According to this, the cooling gas, which has not been sufficiently heat-exchanged by the heat receiver 561 in the process of flowing through the second flow path FP2, flows through the first flow path FP1, so that a larger amount of heat is generated from the cooling gas. Can receive heat and can further cool the cooling gas.
Therefore, the temperature of the cooling gas flowing through the substrate 521 can be reliably lowered, and the substrate 521, and thus the phosphor, can be cooled more efficiently.

  The first partition wall 513 has an opening 5131 that allows the cooling gas to flow from the space S2 side to the substrate 521, and the size of the opening 5131 is substantially the same as the rotation range of the substrate 521. According to this, the cooling gas circulated by the circulation device 55 can be surely circulated to the substrate 521 through the opening 5131. In addition, since the size of the opening 5131 substantially coincides with the rotation range of the substrate 521, the cooling gas that is radially discharged when the substrate 521 rotates rotates to the space S2 side and again faces the substrate 521. Distribution can be suppressed. Therefore, the cooling gas having a relatively low temperature can be surely 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 rotation of the substrate 521 facilitates radial discharge of the cooling gas. Therefore, it is possible to prevent the cooling gas, which has cooled the substrate 521 and is heated, from stagnating around the substrate 521.

Each of the plurality of fins 525 has a shape that curves toward the side opposite to the rotation direction of the substrate 521 from the center side of the substrate 521 toward the outside. According to this, it is possible to facilitate the radial discharge of the heated cooling gas from the substrate 521.
Further, since the cooling gas flows in the direction opposite to the rotation direction of the substrate 521, the fins 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 heat absorbing device 56 has one end connected to the heat receiver 561 and the other end connected to the radiator 563, and serves as a heat conducting member that conducts the heat conducted to the heat receiver 561 to the radiator 563 located outside the housing 51. It has a heat pipe 562. According to this, since the heat conducted to the heat receiver 561 can be surely conducted to the outside of the casing 51 by the heat pipe 562, the temperature of the cooling gas in the casing 51 can be surely lowered. Therefore, the substrate 521 through which the cooling gas flows, and thus the phosphor, can be cooled more effectively.

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

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.
The wavelength conversion device 5 is configured to have a reflection layer 523 that reflects the fluorescent light generated by the phosphor layer 522 when the excitation light is incident from the second pickup lens 49 to the second pickup lens 49. That is, the wavelength conversion device 5 was a reflection type wavelength conversion device that reflects the fluorescent light generated by the incidence of the excitation light. On the other hand, the wavelength conversion device 5 may be configured as a transmissive wavelength conversion element in which the generated fluorescence 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 incident side of the excitation light with respect to the phosphor layer 522, and the substrate 521 transmits the light. In addition to using a transparent substrate, the fin 525 is not provided at a portion of the surface 521B corresponding to the incident position of the excitation light, and the generated fluorescent light is emitted to the side surface portion 51B on the + Z direction side. The transmissive wavelength conversion device can be configured by forming the above. In such a wavelength conversion device, the housing 51 is kept airtight by closing the opening of the side surface 51B from which the fluorescent light is emitted, with a translucent member.

  In the wavelength conversion device 5, the rotation device 53 that rotates the wavelength conversion element 52 (the substrate 521) is housed in the housing 51. On the other hand, for example, the motor main body of the motor constituting the rotating device 53 is arranged outside the housing 51, and the spindle extending from the motor main body and connected to the connecting portion 524 of the substrate 521 is arranged inside the housing 51. You may.

The circulation device 55 is composed of 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 of the cooling gas located in the space S3 through the space S2. A cooling gas was allowed to flow through the element 52 (substrate 521). However, the distribution device 55 may be arranged anywhere in the housing 51, for example, in the space S2.
Further, the circulation device 55 does not have to be a sirocco fan, and may have a configuration having other delivery means such as an axial fan as long as it can circulate the cooling gas through the wavelength conversion element 52 (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 wall 514 and the third partition wall 515 may be omitted. In this case, in the circulation direction of the cooling gas, the space from the circulation device 55 to the wavelength conversion element 52 is the first space, and the space from the wavelength conversion element 52 to the circulation device 55 is the second space. When the housing 51 has the third partition wall 515 and the first partition wall 513 is in contact with the + Y direction side edge of the heat receiver 561, and further the + X direction side edge and the −X direction side edge are in contact with each other. The first partition wall 513 does not have to be connected to the inner surface of the side surface portion 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 wall 513 may be omitted.
In addition, although the case 51 is described as a closed case, it does not have to be a closed case.

  The opening shape of the opening 5131 included in the first partition 513 is substantially the same as the rotation range of the substrate 521. That is, the center of the opening 5131 substantially coincides with the center C of the substrate 521 when viewed from the + Z direction side, and the inner diameter dimension of the opening 5131 substantially coincides with the diameter dimension 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 deviate from each other. 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 back to the surface 521B through the gap between the edge of the opening 5131 and the substrate 521, the inner diameter of the opening 5131 is the same as that 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 are arranged on the surface 521B through which the cooling gas is circulated by the circulation device 55. On the other hand, such fins 525 may be omitted as long as the gas that has cooled the substrate 521 can be radially discharged. The shape of the fin 525 does not have to be a shape that warps in a direction opposite to the rotation direction (D direction) of the substrate 521 as it goes outward. For example, each fin 525 may extend linearly from the center side to the outside.

Inside the housing 51, a heat receiver 561 for receiving heat from the circulating cooling gas is arranged in the space S4, and the heat conducted to the heat receiver 561 is arranged outside the housing 51 by the heat pipe 562 as a heat conducting member. Conducted to the radiator 563 that was generated. 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 passage FP1 and the second flow passage FP2. A large number of heat pipes 562 may be arranged in each. In addition, a Peltier element (thermoelectric element) may be adopted instead of the heat pipe 562.
Further, the heat receiver 561 has the first flow path FP1 through which the cooling gas in the space S2 flows, and the second flow path FP2 through which the wavelength conversion element 52 is cooled and the cooling gas flows from the space S3. However, the present invention is not limited to this, and the first flow path FP1 may be omitted.

In the wavelength conversion device 5, the contact area of the heat pipe 5622 as the second heat conducting member arranged in the second flow passage FP2 with respect to the heat receiver 561 is the first heat conducting member arranged in the first flow passage FP1. The number of heat pipes 5622 is made larger than the number of heat pipes 5621 in order to make the contact area of the heat pipes 5621 to the heat receiver 561 larger. On the contrary, 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 Peltier element is used 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 the number of the Peltier elements. The contact area of the Peltier element arranged in the first flow path FP1 with respect to the heat receiver 561 may be larger.

  The wavelength conversion device 5 includes a heat absorbing device 56 that lowers the temperature of the cooling gas that circulates in the housing 51, and the heat absorbing device 56 includes a heat receiver 561, a heat pipe 562, a radiator 563, and a cooling fan 564. . The heat absorbing device 56 may have any other structure, and the heat absorbing device 56 may be omitted if the cooling gas having a relatively low temperature can be continuously supplied to the wavelength conversion element 52.

It is assumed that the cooling gas that cools the wavelength conversion element 52 flows along the surface 521B of the substrate 521 in the direction opposite to the rotation direction of the substrate 521. On the other hand, when the wavelength conversion device has the first partition wall 513 which separates the cooling gas flowing through the substrate 521 and the cooling gas cooling the substrate 521, the flowing direction of the cooling gas flowing through the substrate 521. It doesn't matter.
In addition, the wavelength conversion element 52 has an opening portion that guides the cooling gas to the substrate 521 similarly to the first partition wall 513, and the gas that circulates from the rotating device 53 side to cool the substrate 521 is the substrate 521. It may be configured to include a partition wall that suppresses circulation to the rotating device 53 side again with the rotation of.

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

  The discharge port 554 of the distribution device 55 is arranged to be displaced in the + X direction side with respect to the virtual line VL. On the other hand, the ejection port 554 may be shifted to the −X direction side with respect to the virtual line VL, and in this case, the rotation direction of the wavelength conversion element 52 may be the direction opposite to the D direction. In addition, the discharge port 554 is arranged on the imaginary line VL, and the discharge direction of the cooling gas from the discharge port 554 is inclined so as to shift toward the + X direction side toward the + Y direction which is the direction toward the wavelength conversion element 52. Good. When the rotation direction of the wavelength conversion element 52 is opposite to the D direction 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 + Y. You may incline so that it may shift | deviate to the -X direction side toward a direction.

  The mounting member 54 for mounting the rotating device 53 on the housing 51 is formed in a cylindrical 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, and may be the inner surface of any 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 a part of the position may be arranged to cover the fin 525. .

The projector 1 has three image forming devices 34 (34R, 34G, 34B) each having a liquid crystal panel as a light modulator. However, the present invention can be applied to a projector having two or less or four or more image forming apparatuses.
Further, although the image forming apparatus 34 uses a transmissive liquid crystal panel having a light-incident surface and a light-exit surface different from each other as a light modulator, a reflective liquid crystal having the same light-incident surface and light-exit surface. A panel may be used. In addition to the liquid crystal, a light modulation device capable of modulating an incident light flux to form an image according to image information, such as a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like, is used. The light modulation device may be used.

Although the optical unit 3 exemplifies the configuration having the optical components and the arrangement shown in FIGS. 2 and 3, the configuration is not limited to this, and other configurations and arrangements may be adopted.
For example, in the lighting device 31, a part of the excitation light emitted from the light source unit 41 is separated by the first retardation plate 44 and the polarization separation device 45, and the part of the excitation light is combined into fluorescent light as blue light. Then, the illumination light WL was generated. On the other hand, instead of separating a part of the excitation light emitted from the light source unit 41 as blue light and using another light source unit that emits blue light in addition to the light source unit 41. Good. In this case, the fluorescence light generated by the excitation light emitted from the light source unit 41 and the blue light emitted from the other light source unit may be combined to generate the illumination light WL. The separated green light LG and red light LR may enter the image forming devices 34G and 34R, respectively, and the blue light emitted from the other light source unit may enter the image forming device 34B.

  The wavelength conversion device 5 and the illumination device 31 are applied to the projector 1. It is also possible to apply the wavelength conversion device 5 and the lighting device 31 to, for example, a lighting device or a light source device of an automobile.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 31 ... Illumination device, 34 (34B, 34G, 34R) ... Image forming device, 36 ... Projection optical device, 41 ... Light source part, 5 ... Wavelength conversion device, 51 ... Housing, 513 ... First partition wall ( Partition wall), 5131 ... Opening portion, 514 ... Second partition wall, 5142 ... Opening portion, 515 ... Third partition wall, 51C, 51D, 51E, 51F ... Side surface portion, 516 ... Arc-shaped portion, 52 ... Wavelength converting element, 521 ... Substrate, 521B ... Surface, 521C, 521D ... Site, 522 ... Phosphor layer, 524 ... Connection part, 525 ... Fin, 53 ... Rotating device, 54 ... Mounting member, 55 ... Circulation device, 553 ... Discharge part, 554 ... Discharge Outlet, 56 ... Endothermic device, AL ... Arrow, C ... Center, D ... Direction (rotational direction), S ... Storage space, S1 ... Space, S2 ... Space (first space), S3 ... Space (second space), S4 ... space, VL ... virtual line.

Claims (10)

A substrate having a phosphor layer containing a phosphor,
A rotating device for rotating the substrate,
A circulation device for circulating a cooling gas through the substrate,
A housing that houses the substrate and the distribution device;
A heat absorbing device that absorbs the heat of the cooling gas,
Equipped with
The cooling gas circulated by the circulation device flows in a direction opposite to the rotation direction of the substrate in a part in the circumferential direction of the substrate when the substrate is viewed along the rotation axis of the substrate. ,
The housing has a partition wall that separates a first space in which the cooling gas flows through the substrate by the flow device and a second space in which the cooling gas radially discharged from the substrate flows.
The heat absorbing device is disposed on the intake side of the flow device, and has a heat receiver that receives heat from the circulating cooling gas,
The heat receiver has a first flow passage through which the cooling gas in the first space flows, and a second flow passage through which the cooling gas in the second space flows. apparatus. The wavelength conversion device according to claim 1,
The distribution device is a sirocco fan,
The wavelength conversion device, wherein the sirocco fan is arranged in the housing such that a rotation axis of the sirocco fan is along a rotation axis of the substrate. The wavelength conversion device according to claim 1 or 2,
The wavelength conversion device, wherein the housing has an arcuate portion that is located outside the substrate when the substrate is viewed along the rotation axis and that extends in a circumferential direction when the substrate rotates. . The wavelength conversion device according to claim 3,
The wavelength conversion device, wherein the arcuate portion is provided at a position facing the part of the substrate in the housing. The wavelength conversion device according to claim 3 or 4 ,
The distribution device has a discharge port for discharging the cooling gas,
When the substrate is viewed along the axis of rotation, the ejection port is arranged so as to be offset from a virtual line that passes through the center of the substrate and intersects the arcuate portion. Wavelength converter. The wavelength conversion device according to claim 5 ,
A mounting member that is disposed in the housing and that mounts the rotating device to the housing;
The substrate has a plurality of fins extending from the center side of the substrate to the outside on the surface where the cooling gas is circulated from the circulation device,
The wavelength conversion device, wherein the mounting member is arranged at a position closer to the center of the substrate than the plurality of fins on the substrate when the substrate is viewed along the rotation axis. The wavelength conversion device according to claim 6 ,
The wavelength conversion device, wherein the mounting member is formed in a columnar shape. The wavelength conversion device according to any one of claims 1 to 7 ,
The wavelength conversion device, wherein the case is a closed case. The wavelength conversion device according to any one of claims 1 to 8 ,
A light source unit that emits light incident on the wavelength conversion device,
A lighting device comprising: A lighting device according to claim 9 ;
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: