JP2016057446A - Projection type display device and optical system unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device that stably cools a cooling object and maintains optical characteristics.SOLUTION: A projection type display device comprises: a light source unit; an optical modulation synthesis unit that modulates light and synthesizes the modulated light; a projection optical unit that projects synthesized light emitted from the optical modulation synthesis unit; and a heat exchange unit. In the projection type display device, the optical modulation synthesis unit and the heat exchange unit are provided in a shield space formed by a shield member, the shield space is sectioned to a first space and a second space by a first partition plate, a cooling device that cools the optical modulation synthesis unit is arranged in the first space, the optical modulation synthesis unit is arranged in the second space, and the heat exchange unit is arranged so as to make the first space communicate with the second space. In the first partition plate, at least one opening part that makes the first space communicate with the second space, is formed. Air in the shield space is made to circulate in the first space, second space and heat exchange unit in this order.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a projection display device and an optical system unit.

  In recent years, the use of a projector device that is a projection display device that displays a projection image on a projection surface such as a screen has been expanded. For example, projector devices are used not only for presentations in offices and video viewing at home, but also in recent years, in conjunction with the digitization of the cinema industry, to provide high-quality images in movie theaters. Yes.

  Such a projector apparatus is provided with a cooling unit such as a cooling fan for cooling the optical system unit. By cooling the optical system unit, the environmental temperature of the optical system unit is prevented from becoming higher than a predetermined temperature, and the optical characteristics are stabilized. A filter is provided in the intake portion of the optical system unit to prevent a reduction in luminance due to minute dust adhering to the optical components of the optical system unit. However, there is a small amount of dust that passes through the filter. Therefore, as in Patent Documents 1 and 2, it has been proposed to prevent dust from adhering to an optical component without providing a filter by sealing the optical system unit.

JP 2000-298311 A International Publication No. 2010/116444

  However, since the techniques described in Patent Documents 1 and 2 are not configured to actively cool the object to be cooled, a sufficient cooling effect cannot be expected, and there is a concern about influence on optical characteristics. Therefore, the present disclosure proposes a new and improved projection display device and optical system unit that can stably cool a cooling target and maintain optical characteristics.

  According to the present disclosure, a light source unit, a light modulation / synthesis unit that modulates and combines incident light guided from the light source unit, a projection optical unit that projects combined light emitted from the light modulation / synthesis unit, and a heat The light modulation / synthesis unit and the heat exchange unit are provided in a shielding space formed by a shielding member, and the shielding space is divided into a first space and a second space by a first partition plate. A cooling device for cooling the light modulation / combination unit is disposed in the first space, and a light modulation / combination unit is disposed in the second space to communicate the first space and the second space. In this way, the heat exchange unit is arranged, and the first partition plate is formed with at least one opening that allows the first space and the second space to communicate with each other. The second space During comprises a structure to circulate in the order of the heat exchange unit, the projection type display apparatus is provided.

  According to the present disclosure, the light modulation / combination unit that modulates and combines the incident light and the heat exchange unit are provided in the shielding space formed by the shielding member, and the shielding space includes the first partition plate. Is divided into a first space and a second space, a cooling device for cooling the light modulation / synthesis unit is disposed in the first space, and a light modulation / synthesis unit is disposed in the second space. The heat exchange unit is disposed so as to communicate between the first space and the second space, and at least one opening for communicating the first space and the second space is formed in the first partition plate. And an optical system unit having a structure in which air in the shielded space is circulated in the order of the first space, the second space, and the heat exchange unit.

  As described above, according to the present disclosure, it is possible to stably cool an object to be cooled and maintain optical characteristics. Note that the above effects are not necessarily limited, and any of the effects shown in the present specification, or other effects that can be grasped from the present specification, together with or in place of the above effects. May be played.

1 is a schematic side view illustrating a schematic configuration of a projection display device according to a first embodiment of the present disclosure. It is a schematic plan view which shows schematic structure of the projection type display apparatus which concerns on the same embodiment. It is a schematic perspective view which shows the cooling unit which cools the light modulation synthetic | combination unit which concerns on the same embodiment. It is a schematic plan view which shows the shielding space where the light modulation synthetic | combination unit which concerns on the embodiment is arrange | positioned, and has shown the flow of the air by a cooling fan. It is a schematic plan view which shows the shielding space where the light modulation synthetic | combination unit which concerns on the embodiment is arrange | positioned, and has shown the flow of the air in a heat exchange unit. It is a schematic side view which shows the state seen from the X-axis direction of the heat exchange unit which concerns on the same embodiment. It is a schematic perspective view which shows the example of 1 structure of the water cooling jacket which concerns on the same embodiment. It is a schematic plan view of the light modulation synthesis unit according to the same embodiment. FIG. 3 is a schematic side view of the light modulation / synthesis unit according to the embodiment, showing a first light modulation / synthesis unit side. FIG. 4 is a schematic side view of the light modulation / synthesis unit according to the embodiment, showing a second light modulation / synthesis unit side. It is a schematic side view which shows the flow of the air of the cooling fan which cools the 2nd light modulation synthetic | combination unit which concerns on the embodiment. In FIG. 11, it is a schematic side view which shows the state which has arrange | positioned the light modulation synthetic | combination unit and the 2nd partition plate. It is a schematic side view which shows the flow of the air of the cooling fan which cools the 1st light modulation synthetic | combination unit which concerns on the embodiment. In FIG. 13, it is a schematic side view which shows the state which has arrange | positioned the light modulation synthetic | combination unit and the 2nd partition plate. It is explanatory drawing explaining cooling of the light modulation synthetic | combination unit by the circulation cooling system which concerns on 2nd Embodiment of this indication.

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

The description will be made in the following order.
1. First embodiment (projection type display device having six liquid crystal panels)
1.1. Schematic configuration of projection display device 1.2. 1. Light modulation / synthesis unit (1) Schematic configuration of light modulation / synthesis unit (2) Configuration of light modulation / synthesis unit (3) Cooling of light modulation / synthesis unit by circulating cooling system Second embodiment (projection type display device including three liquid crystal panels)

<1. First Embodiment>
[1.1. Schematic configuration of projection display device]
First, a schematic configuration of a projection display device according to an embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic side view showing a schematic configuration of the projection display device 1 according to the present embodiment. FIG. 2 is a schematic plan view showing a schematic configuration of the projection display device 1 according to the present embodiment.

  The projection display apparatus 1 according to the present embodiment includes a light source unit 20 (20A, 20B) including three light sources of red, blue, and green, and a light modulation / synthesis unit that modulates and combines light emitted from the light source unit 20. 130 (130A, 130B). The projection display device 1 also includes a projection optical unit 50 that projects the combined light emitted from the light modulation / synthesis unit 130 onto the screen.

  As shown in FIG. 2, the projection display device 1 according to the present embodiment includes two optical systems. The light emitted from the first light source unit 20A is modulated and synthesized by the first light modulation / synthesis unit 130A, and the light emitted from the second light source unit 20B is modulated by the second light modulation / synthesis unit 130B. And synthesized. The first synthesized light emitted from the first light modulation / synthesis unit 130A and the second synthesized light emitted from the second light modulation / synthesis unit 130B are synthesized by the prism type beam splitter 149 which is a light synthesis member. And enters the projection optical unit 50.

  Therefore, the projection display device 1 according to the present embodiment can output two images. For example, an image for the left eye is formed by the first optical system (the first optical unit 20A, the first optical modulation / synthesis unit 130A), and the second optical system (the second optical unit 20B, the second optical unit 20A). The right eye image is formed by the optical modulation / synthesis unit 130B). Then, by outputting the left-eye video and the right-eye video simultaneously from the projection optical unit 50, it is possible to output a 3D video with 4K image quality. In addition, the projection display device 1 according to the present embodiment can project a two-dimensional image by using only one of the two optical systems. Further, if the same two-dimensional image is output from the two optical systems, the two-dimensional image can be projected with twice the luminance.

  In the first optical system and the second optical system, illumination that guides light emitted from the light source units 20A and 20 to the light modulation / synthesis unit 130 between the light source unit 20 and the light modulation / synthesis unit 130, respectively. An optical unit 30 is provided. The illumination optical unit 30 includes a first illumination optical unit 30A provided in the first optical system and a second illumination optical unit 30B provided in the second optical system.

For example, as shown in FIG. 1, the first optical system uses red light R ₁ and blue light B ₁ emitted from a red laser light source 21A and a blue laser light source 23A as the first illumination optical unit 30A. The light enters the first light modulation / combination unit 130A via the one lens system 31A. The green light G ₁ emitted from the green laser light source 25A passes through the second lens system 35A of the first illumination optical unit 30A, after being reflected by the reflecting optical member 37A, the first optical modulation synthesis unit It is incident on 130A.

Similarly, in the second optical system, the red light R ₂ and the blue light B ₂ emitted from the red laser light source 21B and the blue laser light source 23B are reflected through the first lens system of the second illumination optical unit 30B. After being reflected by the optical member, the light enters the second light modulation / synthesis unit 130B. The green light G ₂ emitted from the green laser light source 25B passes through the second lens system of the second illumination optical unit 30B, after being reflected by the reflecting optical member, the second light modulation synthesis unit 130B Incident.

  A part of the light source unit 20, the illumination optical unit 30, the light modulation / combination unit 130, and the projection optical unit 50 are accommodated in the housing 10.

[1.2. Light modulation synthesis unit]
(1) Schematic Configuration of Light Modulation / Synthesis Unit The light modulation / synthesis unit 130 according to the present embodiment is covered with a shielding member to prevent minute dust from adhering to the optical components constituting the unit, and the flow of air Is configured to be cut off from the outside. This eliminates the need to install a fill that has conventionally been provided in a portion where air can move from the outside, and eliminates the need for maintenance such as periodic filter replacement and cleaning of optical components. In addition, in order to let the light which injects from illumination optical unit 30A, 30B and the light radiate | emitted to the projection optical unit 50 pass through the shielding member 150, the part corresponding to the optical path is comprised with the transparent member. The transparent member is, for example, a transparent glass plate. As shown in FIGS. 11 to 14 described later, the shielding member 150 according to the present embodiment is provided with five glass plates 181, 182, 183, 184, and 185.

  Further, the shielded space formed by the shielding member in which the light modulation / synthesis unit 130 is disposed ensures cooling of the liquid crystal panel of the light modulation / synthesis unit 130 to be cooled, and the temperature thereof is substantially constant. The temperature of the air in the shielded space is controlled. Thereby, it is possible to prevent the optical characteristics of the light modulation / synthesis unit 130 from deteriorating.

  For this reason, the light modulation synthesis unit 130 according to the present embodiment is configured as shown in FIGS. FIG. 3 is a schematic perspective view showing a cooling unit for cooling the light modulation / synthesis unit 130 according to the present embodiment. FIG. 4 is a schematic plan view showing a shielded space in which the light modulation / synthesis unit 130 according to the present embodiment is arranged, and shows the flow of air by the cooling fans 111, 113, 115, and 117. FIG. 5 is a schematic plan view showing a shielded space in which the light modulation / synthesis unit 130 according to the present embodiment is arranged, and shows an air flow in the heat exchange unit 160. A structure including the shielding member 150 that covers the light modulation / synthesis unit 130 and the cooling unit is referred to as a circulation cooling system 100.

FIG. 3 shows the cooling fans 111, 113, 115, and 117 and the heat exchange unit 160 that constitute the circulation cooling system 100. As shown in FIG. 4, the cooling fans 111, 113, 115, and 117 that are cooling devices are provided on the first partition plate 120 installed in the shielding member 150. The cooling fans 111, 113, 115, and 117 are disposed in the first space S ₁ among the shielding spaces partitioned by the first partition plate 120. Note that the light modulation / combination unit 130 is arranged in the other space (unit arrangement space S _{2 in the second} space) of the shielding spaces partitioned by the first partition plate 120.

  In the circulating cooling system 100 according to the present embodiment, four cooling fans 111, 113, 115, and 117 are provided. Each of the cooling fans 111, 113, 115, and 117 is directed from the openings 121, 123, 125, and 127 formed in the first partition plate 120 toward the liquid crystal panel that is the cooling target of the light modulation / synthesis unit 130. It arrange | positions in the position which ventilates. As the cooling fans 113 and 115, for example, an axial fan or a sirocco fan is used. In addition, it is desirable that the cooling fans 111 and 117 provided in the center use axial flow fans in which air is diffused.

As shown in FIG. 4, the air blown to the liquid crystal panel of the light modulation / synthesis unit 130 by the cooling fans 111, 113, 115, and 117 is on the opposite side of the first partition plate 130 with respect to the light modulation / synthesis unit 130. It moves to the installed second partition 140 side. Then, the air passes through the opening formed in the second partition plate 140, and the space between the second partition plate 140 and the shielding member 150 (the high temperature space S _{3 in} the second space). ).

High temperature air space S _3, since the temperature by the exhaust heat of the liquid crystal panel and the polarizing plate and the polarization beam splitter is increased, moves upward. Air that has moved upward, as shown in FIG. 3, and reaches the heat exchange unit 160 which flow path is formed that communicates with the high-temperature space S ₃ and the first space S _1. The heat exchange unit 160 is provided on the upper side of the shielding space formed by the shielding member 150 and is shielded from the outside by the shielding member 150. As shown in FIG. 3, the heat exchange unit 160 is configured by arranging heat exchangers 162 and 164 on two opposing surfaces of the water cooling jacket 166, and the heat exchangers 162 and 164 are separated by the water cooling jacket 166. It is cooled.

  Here, the structure of the heat exchange unit 160 which comprises the circulation cooling system 100 is demonstrated based on FIG. 6 and FIG. FIG. 6 is a schematic side view showing a state of the heat exchange unit 160 according to the present embodiment as seen from the X-axis direction. FIG. 7 is a schematic perspective view showing a configuration example of the water cooling jacket 166 according to the present embodiment.

  In the heat exchange unit 160 according to the present embodiment, the first heat exchanger 162 through which the air that has cooled the first light modulation / synthesis unit 130A passes and the air that has cooled the second light modulation / synthesis unit 130B pass through. A second heat exchanger 164. As shown in FIG. 6, the heat exchangers 162 and 164 are provided on opposite surfaces of the water cooling jacket 166.

In the first heat exchanger 162, a plurality of radiating fins extending in the X-axis direction are arranged in the Y-axis direction. These heat dissipating channel formed by the fins, the ends of the X-axis negative direction communicates with the high-temperature space S _3A, an end portion of the X-axis positive side is communicated with the first space S ₁ and. Therefore, the air that has flowed from the high-temperature space S _3A to the first heat exchanger 162 is guided to the first space S ₁ along the radiation fins.

In the second heat exchanger 164, a plurality of radiating fins extending in the Y-axis direction are arranged in the X-axis direction. These heat dissipating channel formed by the fins, the ends of the Y-axis positive side is communicated with the high-temperature space S _3B, the ends of the Y-axis negative direction side is communicated with the first space S ₁ and. Therefore, the air that has flowed from the high-temperature space S _3B to the second heat exchanger 164 is guided to the first space S ₁ along the radiation fins.

In this way, by crossing the flow paths of the heat exchangers 162 and 164, the flow of air that has cooled the light modulation / synthesis units 130A and 130B can be divided substantially evenly, and heat can be exchanged efficiently. be able to. Note that the high temperature spaces S _3A and S _3B communicate with each other, so that air from the high temperature space S _3A flows into the second heat exchanger 164 or air from the high temperature space S _3B passes through the first heat exchanger 162. Or may flow into.

  As shown in FIG. 7, the heat exchangers 162 and 164 are joined to a water cooling jacket 166 in which a water channel 166b through which cooling water flows is formed. The joint surface 166d of the water cooling jacket 166 that contacts the first heat exchanger 162 is joined to the first heat exchanger 162 by brazing, for example. Similarly to the joint surface 166d on the first heat exchanger 162 side, the joint surface that contacts the second heat exchanger 164 of the water cooling jacket 166 may be joined to the second heat exchanger 164 by brazing. The cooling water flowing into the water cooling jacket 166 is managed at a predetermined temperature by a thermo-chiller (not shown) that circulates the cooling water while controlling the water temperature. For example, as shown in FIG. 7, the water cooling jacket 166 includes a cooling water inlet 166a and an outlet 166c on the same side, and a water channel 166b that connects the inlet 166a and the outlet 166c is formed inside the water cooling jacket. The The water channel 166b is formed in, for example, a zigzag so that the cooling water flows through the entire cooling surface on which the heat exchangers 162 and 164 are provided.

  Thus, the cooling water whose temperature is controlled by the thermo-chiller flows through the water cooling jacket 166, so that the heat exchange efficiency by the heat exchangers 162 and 164 provided in the cooling water can be maintained constant. Therefore, the temperature of the air that has passed through the heat exchangers 162 and 164 can be set to a substantially constant temperature.

Referring back to FIGS. 3 to 5, the air flowing from the high-temperature space S _3, as shown in FIG. 5, after being cooled by passing through the flow channel of the heat exchanger 162, a first space It flows into the S _1. The cooled air is blown to the liquid crystal panel of the light modulation / synthesis unit 130 by the cooling fans 111, 113, 115, and 117 in the first space S ₁ . As described above, the light modulation / synthesis unit 130 according to the present embodiment is sealed by the shielding member 150 so that no dust is mixed therein, and the temperature in the shielding space is also managed, so that deterioration of optical characteristics can be prevented. Hereinafter, the configuration of the light modulation / synthesis unit 130 including the circulation cooling system 100 will be described in detail.

(2) Configuration of Light Modulation / Synthesis Unit First, the configuration of the light modulation / synthesis unit 130 according to the present embodiment will be described with reference to FIGS. FIG. 8 is a schematic plan view of the light modulation / synthesis unit 130 according to this embodiment. FIG. 9 is a schematic side view of the light modulation / synthesis unit 130 according to the present embodiment, and shows the first light modulation / synthesis unit 130A side. FIG. 10 is a schematic side view of the light modulation / synthesis unit 130 according to the present embodiment, showing the second light modulation / synthesis unit 130B side.

  As described above, the light modulation / synthesis unit 130 according to the present embodiment includes the first light modulation / synthesis unit 130A and the second light modulation / synthesis unit 130B, and the reflecting surface of the prism beam splitter 149, which is a light synthesis member. It is arranged in plane symmetry with respect to 149a. For example, as shown in FIG. 8, the first light modulation / synthesis unit 130 </ b> A is arranged along the Y-axis direction so as to emit the synthesized light in the same direction as the emission direction of the projection optical unit 50. On the other hand, the second light modulation / combination unit 130 </ b> B is arranged along the X-axis direction so as to emit the combined light in a direction orthogonal to the emission direction of the projection optical unit 50.

As shown in FIG. 9, the first light modulation / synthesis unit 130A includes three reflective liquid crystal panels corresponding to the red light R ₁ , the blue light B ₁ , and the green light G ₁ emitted from the first light source unit 20A. 131rA, 131bA, and 131gA are provided as a set.

  The reflective liquid crystal panels 131rA, 131bA, and 131gA receive an instruction from the first liquid crystal panel control board 170A connected via the flexible cables 172rA, 172bA, and 172gA, and polarize and modulate incident light based on image information. . In order to modulate and synthesize incident light, a polarizing plate, a polarizing beam splitter, a spacer glass, and a half-wave plate are provided for the reflective liquid crystal panels 131rA, 131bA, and 131gA, respectively. In addition, the reflective liquid crystal panels 131rA, 131bA, and 131gA are provided with heat sinks 132rA, 132bA, and 132gA, respectively, on the side opposite to the light incident surface. The shielding plate 150A has openings through which the flexible cables 172rA, 172bA, and 172gA of the reflective liquid crystal panel are passed. For example, a cushion material or the like is sandwiched between the flexible cable and the opening. Thereby, the clearance gap between a flexible cable and an opening part is filled, and a wind does not leak outside from the periphery of an opening part.

For example, a reflective liquid crystal panels 131rA of the red light _{R 1} comprises a polarizer 136RA, a polarization beam splitter 133RA, a glass spacer 134RA, a 1/2-wavelength plate 135RA. The reflective liquid crystal panel 131rA, the polarizing beam splitter 133rA, the spacer glass 134rA, and the half-wave plate 135rA are disposed on the same optical axis in the Z-axis direction.

The red light _{R 1} which is incident along the Y-axis direction enters the polarization beam splitter 133rA through the polarizing plate 136RA, is reflected in the Z axis direction, is incident on the reflective liquid crystal panel 131RA. Light R ₁ incident on the reflective liquid crystal panel 131rA, after being polarization modulated in accordance with image information and emitted to the polarization beam splitter 133RA. The light incident on the polarizing beam splitter 133rA enters the half-wave plate 135rA via the spacer glass 134rA, and then enters the surface on the positive side of the Z axis of the cross dichroic prism 137A.

A reflective liquid crystal panels 131bA of the blue light _{B 1} also comprises a polarizer 136BA, a polarization beam splitter 133bA, and the glass spacer 134Ba, and a 1/2-wavelength plate 135bA. The reflective liquid crystal panel 131bA, the polarization beam splitter 133bA, the spacer glass 134bA, and the half-wave plate 135bA are disposed on the same optical axis in the Z-axis direction. These are arranged above and below the red optical member described above.

The blue light _{B 1} which is incident along the Y-axis direction enters the polarization beam splitter 133bA through the polarizing plate 136BA, is reflected in the Z axis direction, is incident on the reflective liquid crystal panel 131Ba. Light B ₁ incident on the reflective liquid crystal panel 131bA, after being polarization modulated in accordance with image information and emitted to the polarization beam splitter 133bA. The light incident on the polarizing beam splitter 133bA enters the half-wave plate 135bA via the spacer glass 134bA, and then enters the surface on the negative side of the Z axis of the cross dichroic prism 137A.

Reflective liquid crystal panel 131gA green light _{G 1} also comprises a polarizer 136GA, a polarization beam splitter 133GA, a glass spacer 134GA, a 1/2-wavelength plate 135GA. The reflective liquid crystal panel 131gA, the polarizing beam splitter 133gA, the spacer glass 134gA, and the half-wave plate 135gA are disposed on the same optical axis in the Y-axis direction.

Green light _{G 1} entering along the X-axis direction enters the polarization beam splitter 133gA through the polarizing plate 136GA, is reflected in the Z axis direction, is incident on the reflective liquid crystal panel 131GA. Light R ₁ incident on the reflective liquid crystal panel 131gA, after being polarization modulated in accordance with image information and emitted to the polarization beam splitter 133GA. The light incident on the polarization beam splitter 133gA enters the half-wave plate 135gA via the spacer glass 134gA, and then enters the surface on the Y axis negative direction side of the cross dichroic prism 137A.

  Light incident from the three surfaces of the cross dichroic prism 137A is guided to the Y axis positive direction side by the dichroic prism 137A and is incident on the prism type beam splitter 149.

On the other hand, as shown in FIG. 10, the second light modulation / combination unit 130B also has three reflective types corresponding to the red light R ₂ , blue light B ₂ , and green light G ₂ emitted from the second light source unit 20A. Liquid crystal panels 131rB, 131bB, and 131gB are provided as a set.

  The reflective liquid crystal panels 131rB, 131bB, and 131gB receive an instruction from the second liquid crystal panel control board 170B connected via the flexible cables 172rB, 172bB, and 172gB, and polarize and modulate incident light based on image information. . In order to modulate and synthesize incident light, a polarizing plate, a polarizing beam splitter, a spacer glass, and a half-wave plate are provided for the reflective liquid crystal panels 131rB, 131bB, and 131gB, respectively. Further, the reflective liquid crystal panels 131rB, 131bB, and 131gB are provided with heat sinks 132rB, 132bB, and 132gB, respectively, on the side opposite to the light incident surface. The shielding plate 150B has openings through which the flexible cables 172rB, 172bB, and 172gB of the reflective liquid crystal panel are passed. For example, a cushion material or the like is sandwiched between the flexible cable and the opening. Thereby, the clearance gap between a flexible cable and an opening part is filled, and a wind does not leak outside from the periphery of an opening part.

For example, a reflective liquid crystal panels 131rB of the red light _{R 2} comprises a polarizer 136RB, and the polarization beam splitter 133RB, and the glass spacer 134RB, and 1/2-wavelength plate 135RB. The reflective liquid crystal panel 131rB, the polarization beam splitter 133rB, the spacer glass 134rB, and the half-wave plate 135rB are disposed on the same optical axis in the Z-axis direction. The red optical members of the second light modulation / combination unit 130B are arranged so that the position (height) in the Z-axis direction is substantially the same as the red optical member of the first light modulation / combination unit 130A. Has been.

The red light _{R 2} entering along the X-axis direction enters the polarization beam splitter 133rB through the polarizing plate 136RB, is reflected in the Z axis direction, is incident on the reflective liquid crystal panel 131RB. Light R ₂ incident on the reflective liquid crystal panel 131rB, after being polarization modulated in accordance with image information and emitted to the polarization beam splitter 133RB. The light incident on the polarization beam splitter 133rB enters the half-wave plate 135rB via the spacer glass 134rB, and then enters the surface on the positive side of the Z axis of the cross dichroic prism 137B.

A reflective liquid crystal panels 131bB of the blue light _{B 2} is also provided with a polarizing plate 136BB, and the polarization beam splitter 133bb, a glass spacer 134BB, a 1/2-wavelength plate 135BB. The reflective liquid crystal panel 131bB, the polarization beam splitter 133bB, the spacer glass 134bB, and the half-wave plate 135bB are disposed on the same optical axis in the Z-axis direction. These are arranged above and below the red optical member described above. In addition, the blue optical member of the second light modulation / combination unit 130B has substantially the same position (height) in the Z-axis direction as the blue optical member of the first light modulation / combination unit 130A. Is arranged.

The blue light _{B 2} incident along the X-axis direction enters the polarization beam splitter 133bB through the polarizing plate 136BB, are reflected in the Z axis direction, is incident on the reflective liquid crystal panel 131BB. Light B ₂ incident on the reflective liquid crystal panel 131bB, after being polarization modulated in accordance with image information and emitted to the polarization beam splitter 133bb. The light incident on the polarization beam splitter 133bB enters the half-wave plate 135bB via the spacer glass 134bB and then enters the surface on the negative side of the Z axis of the cross dichroic prism 137B.

Reflective liquid crystal panel 131gB green light _{G 2} is also provided with a polarizing plate 136GB, and the polarization beam splitter 133GB, and the glass spacer 134GB, and 1/2-wavelength plate 135GB. The reflective liquid crystal panel 131gB, the polarization beam splitter 133gB, the spacer glass 134gB, and the half-wave plate 135gB are disposed on the same optical axis in the X-axis direction.

Green light _{G 2} which is incident along the Z-axis direction enters the polarization beam splitter 133gB through the polarizer 136GB, is reflected in the X-axis direction, is incident on the reflective liquid crystal panel 131GB. Light G ₂ incident on the reflective liquid crystal panel 131gB, after being polarization modulated in accordance with image information and emitted to the polarization beam splitter 133GB. The light incident on the polarization beam splitter 133gB enters the half-wave plate 135gB through the spacer glass 134gB, and then enters the surface on the X axis positive direction side of the cross dichroic prism 137B.

  Light incident from the three surfaces of the cross dichroic prism 137B is guided to the X axis negative direction side by the dichroic prism 137B and is incident on the prism type beam splitter 149.

  The combined light of the first light modulation / synthesis unit 130A and the combined light of the second light modulation / synthesis unit 130B incident on the prism type beam splitter 149 are emitted from the surface on the Y axis positive direction side, as shown in FIG. And enters the projection optical unit 50.

  These optical components are arranged so that the relative positional relationship has good accuracy. For example, a predetermined relative positional relationship may be maintained by constituting an integrated optical block by joining these optical components together. Each reflective liquid crystal panel 131 and prism type polarization beam splitter 133 may be mechanically joined and fixed by metal parts (not shown) or the like.

(3) Cooling of the light modulation and synthesis unit by the circulation cooling system The light modulation and synthesis unit 130 described above is efficient and efficient by cooling the shielded space by the circulation cooling system 100 and circulating the air formed by the circulation cooling system 100. Cools stably. The cooling of the light modulation / synthesis unit 130 by the circulating cooling system 100 will be described in detail with reference to FIGS. FIG. 11 is a schematic side view showing the air flow of the cooling fans 111, 115, and 117 that cool the second light modulation / synthesis unit 130B according to the present embodiment. FIG. 12 is a schematic side view showing a state in which the light modulation / synthesis unit 130 and the second partition plate 140 are arranged in FIG. 11. FIG. 13 is a schematic side view showing the air flow of the cooling fans 111, 113, and 117 that cool the first light modulation / synthesis unit 130A according to the present embodiment. FIG. 14 is a schematic side view showing a state in which the light modulation / synthesis unit 130 and the second partition plate 140 are arranged in FIG. 13.

First, cooling of the second light modulation / synthesis unit 130B will be described. As shown in FIG. 11, the second light modulation / combination unit 130B includes a liquid crystal panel 131rB, 131bB, and 131gB arranged in a first space S ₁ by cooling fans 111, 117, and 115 disposed to face _{each other.} The low-temperature air that has flowed into is blown and cooled.

  Since the cooling fan 115 is disposed to face the green liquid crystal panel 131gB, an axial fan, a sirocco fan, or the like can be used as the cooling fan 115. On the other hand, the cooling fan 111 that cools the red liquid crystal panel 131rB and the cooling fan 117 that cools the blue liquid crystal panel 131bB are the red liquid crystal panel 131rA and the blue liquid crystal panel of the first light modulation / synthesis unit 130A. 131bA is also cooled. Therefore, in this embodiment, as shown in FIG. 4, the rotation axes of the cooling fans 111 and 117 are positioned on the reflecting surface 149a of the prism type beam splitter 149, and the prism type beam splitter which is also one side of the reflecting surface 149a. The air is blown toward one side of 149.

A second partition plate 140 is provided between the prism type beam splitter 149 and the light modulation / combination unit 130. The second partition plate 140 includes a first plate 140A formed on the YZ plane along the first light modulation / synthesis unit 130A, and a fourth plate formed on the ZX plane along the second light modulation / synthesis unit 130B. Plate 140D. Between the first plate 140A and the fourth plate 140D, the second plate 140B and the third plate 140C are arranged along the outer shape of the rectangular parallelepiped prism beam splitter 149. That is, a right-angle surface is formed by the second plate 140B and the third plate 140C. An upper plate 140E is provided on the upper part of the second partition plate. Upper plate 140E includes a first heat exchanger 162 is disposed between the first space _{S 1} and the second space _{S 2.}

  The air blown toward one side of the prism beam splitter 149 collides with the side where the second plate 140B and the third plate 140C of the second partition plate 140 intersect. As a result, the air blown by the cooling fans 111 and 117 is diverted, and a flow bent by about 45 ° toward the first light modulation / synthesis unit 130A and a flow bent by about 45 ° toward the second light modulation / synthesis unit 130B. Will occur. At this time, the divided air flows into the red liquid crystal panel 131rA and the blue liquid crystal panel 131bA of the first light modulation / synthesis unit 130A, and the red liquid crystal panel 131rB and blue of the second light modulation / synthesis unit 130B. Each member is preferably arranged so as to hit the liquid crystal panel 131bB.

  In this way, by causing the second plate 140B and the third plate 140C of the second partition plate 140 to function as a diversion unit that diverts the air blown by the cooling fans 111 and 117, two liquid crystal panels can be obtained with one cooling fan. Is cooling. As the shared cooling fans 111 and 117, it is preferable to use an axial fan that diffuses air.

The air blown to the liquid crystal panels 131rB, 131bB, and 131gB of the second light modulation / synthesis unit 130B by the cooling fans 111, 117, and 115 becomes high temperature due to the heat of the liquid crystal panels 131rB, 131bB, and 131gB. The air temperature has become high, the second partition plate 140, the liquid crystal panels 131rB, 131bB, flows from the openings 144, 145, 146 which is formed at a position facing the 131gB the hot space _{S 3B.}

As shown in FIG. 11, the air that has flowed into the high temperature space S _3B rises and flows into the flow path of the second heat exchanger 164. And the air which flowed through the flow path of the 2nd heat exchanger 164 becomes low temperature, and flows in into _1st space S1. Cold air flowing into the first space _{S 1} again by the cooling fan 111,117,115, the liquid crystal panels 131rB the second optical modulation synthesis unit 130B, 131BB, blown to 131GB.

  In this way, air that is constantly adjusted to a predetermined temperature by the cooling fans 111, 117, and 115 is blown onto the liquid crystal panels 131rB, 131bB, and 131gB of the second light modulation / synthesis unit 130B. Therefore, the liquid crystal panels 131rB, 131bB, and 131gB can be stably cooled, and the optical characteristics are also stabilized. Further, since the air circulation path in the shielded space is efficiently designed, backflow of air hardly occurs.

Next, cooling of the first light modulation / synthesis unit 130A will be described. The cooling of the first light modulation / synthesis unit 130A is performed in the same manner as the cooling of the second light modulation / synthesis unit 130B. As shown in FIG. 13, in the first light modulation / combination unit 130A, the liquid crystal panels 131rA, 131bA, and 131gA are arranged in the first space S ₁ by the cooling fans 111, 117, and 113 arranged to face _{each other.} The low-temperature air that has flowed into is blown and cooled.

  Since the cooling fan 113 is arranged to face the green liquid crystal panel 131gA, an axial fan, a sirocco fan, or the like can be used as the cooling fan 113. On the other hand, the cooling fan 111 that cools the red liquid crystal panel 131rA and the cooling fan 117 that cools the blue liquid crystal panel 131bA are, as described above, the red liquid crystal panel 131rB and the red liquid crystal panel 131rB of the second light modulation / synthesis unit 130B. The blue liquid crystal panel 131bB is also cooled. The liquid crystal panels 131rA and 131bA are cooled by the air diverted by the second plate 140B and the third plate 140C of the second partition plate 140 in which the air from the cooling fans 111 and 117 functions as a diverter.

The air blown to the liquid crystal panels 131rA, 131bA, and 131gA of the first light modulation / synthesis unit 130A by the cooling fans 111, 117, and 113 becomes high temperature by the heat of the liquid crystal panels 131rA, 131bA, and 131gA. The high-temperature air flows into the high-temperature space S _3A from the openings 141, 142, and 143 formed in the second partition plate 140 at positions facing the liquid crystal panels 131rA, 131bA, and 131gA.

As shown in FIG. 13, the air that has flowed into the high temperature space S _{3 </ b> A} rises and flows into the flow path of the first heat exchanger 162. At this time, the partition plate 140F is provided so that the high temperature space _S3A does not communicate with the flow path of the second heat exchanger 164. As a result, the air that has flowed into the high-temperature space _S3A on the first light modulation / synthesis unit 130A side is reliably guided to the first heat exchanger 162. And the air which flowed through the flow path of the 1st heat exchanger 162 becomes low temperature, and flows in into _1st space S1. Cold air flowing into the first space _{S 1} again by the cooling fan 111,117,113, the liquid crystal panels 131rA of the first light modulation synthesis unit 130A, 131Ba, blown to 131GA.

  In this way, air that is constantly adjusted to a predetermined temperature by the cooling fans 111, 117, and 115 is blown onto the liquid crystal panels 131rA, 131bA, and 131gA of the first light modulation / synthesis unit 130A. Therefore, the liquid crystal panels 131rA, 131bA, and 131gA can be stably cooled, and the optical characteristics are also stabilized. Further, since the air circulation path in the shielded space is efficiently designed, backflow of air hardly occurs.

  The cooling in the shielded space by the circulation cooling system 100 of the light modulation / synthesis unit 130 and the air circulation formed by the circulation cooling system 100 have been described above. In the present embodiment, since the two light modulation / combination units 130A and 130B are provided, the air after cooling each is dispersed in the first heat exchanger 162 and the second heat exchanger 164, A mechanism for efficient heat exchange has also been realized.

  Further, the light modulation / synthesis unit 130 according to the present embodiment is hermetically sealed by the shielding member 150 and is provided on the inner side of the projection display device 1 as shown in FIG. Therefore, the noise of the cooling fans 111, 113, 115, and 117 is hardly leaked to the outside, and the projection display device 1 can be silenced.

<2. Second Embodiment>
Next, based on FIG. 15, a light modulation and synthesis unit by the circulation cooling system according to the second embodiment of the present disclosure will be described. The light modulation / synthesis unit 130 according to the present embodiment includes a set of three reflective liquid crystal panels corresponding to red light, blue light, and green light emitted from a light source unit (not shown). That is, the light modulation / synthesis unit 130 according to the present embodiment is configured to include only one of the light modulation / synthesis units 130A and 130B of the first embodiment. Also in this case, the light modulation / synthesis unit 130 shielded by the shielding member 202 can be efficiently and stably cooled by the circulation cooling system 200.

  FIG. 15 is an explanatory diagram for explaining cooling by the light modulation and synthesis unit 130 by the circulating cooling system 200 according to the present embodiment. As shown in FIG. 15, the light modulation / combination unit 130 is disposed in the shielding space in the shielding member 202. The configuration of the light modulation / synthesis unit 130 can be the same as that of the light modulation / synthesis units 130A and 130B according to the first embodiment, and thus detailed description thereof is omitted here.

The shielding space is partitioned by the partition plate 220 into a first space S ₁ that is at a low temperature and a second space S ₂ that is at a high temperature. The partition plate 220 is provided with three cooling fans 211, 213, and 215 so as to face the three reflective liquid crystal panels corresponding to the red light, blue light, and green light of the light modulation / combination unit 130. The partition plate 220 is opened at portions where the cooling fans 211, 213, and 215 are installed.

First space S ₁ and between the second space S _2, the heat exchange unit 260 having a flow passage for communicating the space provided. The heat exchange unit 260 includes a heat exchanger 262 having a flow path formed by a plurality of radiating fins, and a water cooling jacket 264 that cools one surface of the heat exchanger 262. The water cooling jacket 264 is connected to the thermo-chiller 300 by tubes 302 and 304 so that cooling water adjusted to a predetermined temperature circulates. Air flowing from the second space S ₂ become hot heat exchanger 262 is cooled to a predetermined temperature, it flows into the first space S _1.

  As described above, in the light modulation and synthesis unit 130 according to this embodiment, the liquid crystal panel to be cooled is reliably cooled by the cooling fans 211, 213, and 215 in the shielded space. Further, since the high-temperature air is circulated after being cooled to a predetermined temperature by the heat exchange unit 260 by the circulation cooling system 200, the light modulation and synthesis unit 130 can be cooled efficiently and stably. .

  The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present disclosure can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present disclosure.

  For example, in the above embodiment, a plurality of cooling fans are provided, but the present technology is not limited to such an example. For example, the light modulation / synthesis unit 130 may be cooled by a single cooling fan. One cooling fan may be provided for one cooling object, and a plurality of cooling objects may be cooled by one cooling fan. Further, when a plurality of cooling fans are provided, the performance of each cooling fan may be the same or different so that the cooling performance necessary for cooling the object to be cooled can be exhibited. For example, for each of the above-mentioned reflective liquid crystal panels for red light, blue light, and green light, a cooling fan that cools the reflective liquid crystal panel that emits large amount of red light has higher cooling performance than other cooling fans. May be.

  Further, the effects described in the present specification are merely illustrative or exemplary and are not limited. That is, the technology according to the present disclosure can exhibit other effects that are apparent to those skilled in the art from the description of the present specification in addition to or instead of the above effects.

The following configurations also belong to the technical scope of the present disclosure.
(1)
A light source unit;
A light modulation and synthesis unit that modulates and synthesizes the light incident from the light source unit; and
A projection optical unit that projects the combined light emitted from the light modulation combining unit;
A heat exchange unit;
Consists of
The light modulation and synthesis unit and the heat exchange unit are provided in a shielded space formed by a shield member,
The shielding space is partitioned into a first space and a second space by a first partition plate,
A cooling device that cools the light modulation and synthesis unit is disposed in the first space, and the light modulation and synthesis unit is disposed in the second space, and the first space and the second space are separated from each other. The heat exchange unit is arranged to communicate,
The first partition plate is formed with at least one opening for communicating the first space and the second space,
A projection display device comprising a structure in which air in the shielded space is circulated in the order of the first space, the second space, and the heat exchange unit.
(2)
A second partition plate that divides the second space into a unit arrangement space adjacent to the first space and in which the light modulation / synthesis unit is arranged, and a high-temperature space communicating with the heat exchange unit; In addition,
The projection display device according to (1), wherein at least one opening is formed in the second partition plate.
(3)
The said heat exchange unit is a projection type display apparatus as described in said (1) or (2) installed so that it may be located in the apparatus upper side at the time of installation of the said projection type display apparatus.
(4)
The light modulation / synthesis unit includes a first optical system that forms first synthetic light and a second optical system that forms second synthetic light,
The combined display emitted from the first optical system and the second optical system is combined by a combining optical member and introduced into the projection optical unit. The projection display device according to (2) or (3) .
(5)
The projection display device according to (4), wherein the first optical system and the second optical system are arranged in plane symmetry with respect to a reflection surface of the synthetic optical member.
(6)
The first optical system and the second optical system are:
A liquid crystal panel for red light, a liquid crystal panel for blue light, and a liquid crystal panel for green light that modulate light from the light source unit into red, blue, and green; and
A dichroic prism that combines red, blue, and green light incident from three directions and emits the light in one direction;
On the same plane as the emission direction of the synthesized light,
The projection display device according to (4) or (5), wherein the opening is formed in the first partition plate and the second partition plate corresponding to an arrangement position of each liquid crystal panel. .
(7)
The liquid crystal panel for red light and the liquid crystal panel for blue light of the first optical system and the second optical system are provided closer to the synthetic optical member than the liquid crystal panel for green light,
The cooling device is
A first cooling fan for cooling the red light liquid crystal panel of the first optical system and the red light liquid crystal panel of the second optical system;
A second cooling fan that cools the blue light liquid crystal panel of the first optical system and the blue light liquid crystal panel of the second optical system;
A third cooling fan for cooling the green light liquid crystal panel of the first optical system;
A fourth cooling fan for cooling the green light liquid crystal panel of the second optical system;
The projection display device according to (6), comprising:
(8)
The projection display device according to (7), wherein the first cooling fan and the second cooling fan are axial fans.
(9)
The first cooling fan and the second cooling fan are arranged so that a rotation axis is located on a reflection surface of the synthetic optical member,
The projection according to (7) or (8), further including a diverter that diverts the air blown by the first cooling fan and the second cooling fan to the first optical system and the second optical system. Type display device.
(10)
The projection type display device according to (9), wherein the diversion unit is configured by the second partition plate.
(11)
The heat exchange unit is
A first heat exchanger for exchanging heat of air flowing from the first optical system side;
A second heat exchanger for exchanging heat of air flowing from the second optical system side;
The water cooling jacket which is arrange | positioned between the said 1st heat exchanger and the said 2nd heat exchanger, and a cooling water circulates, It is any one of said (4)-(10). Projection display device.
(12)
The projection display device according to (11), wherein the air flow channel direction in the first heat exchanger and the air flow channel direction in the second heat exchanger are formed to intersect each other.
(13)
In the shielding member, a part for allowing light to enter from the light source unit to the light modulation / synthesis unit and a part for emitting light from the light modulation / synthesis unit to the projection optical unit are formed by a transparent member, The projection display device according to any one of (1) to (12).
(14)
The projection display device according to any one of (1) to (13), wherein the light modulation and synthesis unit surrounded by the shielding member is disposed on an inner side of the projection display device.
(15)
A light modulation and synthesis unit that modulates and synthesizes incident light and a heat exchange unit are provided in a shielded space formed by a shield member,
The shielding space is partitioned into a first space and a second space by a first partition plate,
A cooling device that cools the light modulation and synthesis unit is disposed in the first space, and the light modulation and synthesis unit is disposed in the second space, and the first space and the second space are separated from each other. The heat exchange unit is arranged to communicate,
The first partition plate is formed with at least one opening for communicating the first space and the second space,
An optical system unit comprising a structure in which air in the shielded space is circulated in the order of the first space, the second space, and the heat exchange unit.

DESCRIPTION OF SYMBOLS 1 Projection type display apparatus 20 Light source unit 30 Illumination optical unit 50 Projection optical unit 100, 200 Circulation cooling system apparatus 111, 113, 115, 117, 211, 213, 215 Cooling fan 120 1st partition plate 130 Light modulation synthesis unit 140 Second partition plate 150, 202 Shield member 160, 260 Heat exchange unit 162, 164, 262 Heat exchanger 166, 264 Water-cooled jacket 300 Thermo-chiller

Claims (15)

A light source unit;
A light modulation and synthesis unit that modulates and synthesizes the light incident from the light source unit; and
A projection optical unit that projects the combined light emitted from the light modulation combining unit;
A heat exchange unit;
Consists of
The light modulation and synthesis unit and the heat exchange unit are provided in a shielded space formed by a shield member,
The shielding space is partitioned into a first space and a second space by a first partition plate,
A cooling device that cools the light modulation and synthesis unit is disposed in the first space, and the light modulation and synthesis unit is disposed in the second space, and the first space and the second space are separated from each other. The heat exchange unit is arranged to communicate,
The first partition plate is formed with at least one opening for communicating the first space and the second space,
A projection display device comprising a structure in which air in the shielded space is circulated in the order of the first space, the second space, and the heat exchange unit. A second partition plate that divides the second space into a unit arrangement space adjacent to the first space and in which the light modulation / synthesis unit is arranged, and a high-temperature space communicating with the heat exchange unit; In addition,
The projection display device according to claim 1, wherein at least one opening is formed in the second partition plate.   The projection display device according to claim 1, wherein the heat exchange unit is installed so as to be positioned on an upper side of the device when the projection display device is installed. The light modulation / synthesis unit includes a first optical system that forms first synthetic light and a second optical system that forms second synthetic light,
The projection display apparatus according to claim 2, wherein the combined light emitted from the first optical system and the second optical system is combined by a combining optical member and introduced into the projection optical unit.   5. The projection display device according to claim 4, wherein the first optical system and the second optical system are disposed symmetrically with respect to a reflection surface of the synthetic optical member. The first optical system and the second optical system are:
A liquid crystal panel for red light, a liquid crystal panel for blue light, and a liquid crystal panel for green light that modulate light from the light source unit into red, blue, and green; and
A dichroic prism that combines red, blue, and green light incident from three directions and emits the light in one direction;
On the same plane as the emission direction of the synthesized light,
5. The projection display device according to claim 4, wherein the opening is formed in the first partition plate and the second partition plate in accordance with an arrangement position of each liquid crystal panel. The liquid crystal panel for red light and the liquid crystal panel for blue light of the first optical system and the second optical system are provided closer to the synthetic optical member than the liquid crystal panel for green light,
The cooling device is
A first cooling fan for cooling the red light liquid crystal panel of the first optical system and the red light liquid crystal panel of the second optical system;
A second cooling fan that cools the blue light liquid crystal panel of the first optical system and the blue light liquid crystal panel of the second optical system;
A third cooling fan for cooling the green light liquid crystal panel of the first optical system;
A fourth cooling fan for cooling the green light liquid crystal panel of the second optical system;
The projection display device according to claim 6, comprising:   The projection display device according to claim 7, wherein the first cooling fan and the second cooling fan are axial fans. The first cooling fan and the second cooling fan are arranged so that a rotation axis is located on a reflection surface of the synthetic optical member,
The projection display device according to claim 7, further comprising a flow dividing unit that diverts air blown by the first cooling fan and the second cooling fan to the first optical system and the second optical system.   The projection display device according to claim 9, wherein the diversion unit is configured by the second partition plate. The heat exchange unit is
A first heat exchanger for exchanging heat of air flowing from the first optical system side;
A second heat exchanger for exchanging heat of air flowing from the second optical system side;
The projection type display device according to claim 4, comprising a water cooling jacket disposed between the first heat exchanger and the second heat exchanger and circulating cooling water.   The projection display device according to claim 11, wherein the air flow path direction in the first heat exchanger and the air flow path direction in the second heat exchanger are formed to intersect each other.   In the shielding member, a portion for allowing light to be incident on the light modulation / synthesis unit from the light source unit and a portion for emitting light from the light modulation / synthesis unit to the projection optical unit are formed of a transparent member. Item 4. A projection display device according to Item 1.   The projection display device according to claim 1, wherein the light modulation and synthesis unit surrounded by the shielding member is disposed on an inner side of the projection display device. A light modulation and synthesis unit that modulates and synthesizes incident light and a heat exchange unit are provided in a shielded space formed by a shield member,
The shielding space is partitioned into a first space and a second space by a first partition plate,
A cooling device that cools the light modulation and synthesis unit is disposed in the first space, and the light modulation and synthesis unit is disposed in the second space, and the first space and the second space are separated from each other. The heat exchange unit is arranged to communicate,
The first partition plate is formed with at least one opening for communicating the first space and the second space,
An optical system unit comprising a structure in which air in the shielded space is circulated in the order of the first space, the second space, and the heat exchange unit.

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