JP2022148078A - projector - Google Patents

Abstract

To solve the problem in which: refrigerant generation efficiency of a refrigerant generating unit may be reduced.SOLUTION: A projector comprises a cooling device that, with a refrigerant changing to gas, cools an object to be cooled. A refrigerant generating unit of the cooling device has a rotating moisture absorption/release member, a first ventilation device that sends air to a first portion of the moisture absorption/release member, a heating unit that heats a second portion of the moisture absorption/release member, a second ventilation device that sends air around the second portion to the inside of a heat exchange unit, a distribution duct through which the air sent from the first ventilation device passes, a circulation duct through which air circulated by the second ventilation device between the second portion and the heat exchange unit passes, and a reinforcement member. The distribution duct has a first opening that opens toward the first portion. The circulation duct has a second opening that opens toward the second portion. The first opening and the second opening are arranged at an interval along a circumferential direction. The reinforcement member has side parts arranged between the first opening and second opening and the moisture absorption/release member. The side parts are each provided with a plurality of through holes.SELECTED DRAWING: Figure 7

Description

The present invention relates to projectors.

Japanese Patent Application Laid-Open No. 2002-200002 describes a projector that includes a coolant generation unit that generates coolant. In the refrigerant generating unit of the projector disclosed in Patent Document 1, the moisture absorbed by a part of the rotating moisture absorbing/desorbing member is released into the air circulating between the other part of the moisture absorbing/desorbing member and the heat exchange unit. A refrigerant is produced by moistening and condensing moisture from the circulating air in a heat exchange section.

JP 2019-117332 A

The refrigerant generation unit of the projector as described above is provided with a circulation duct through which air circulates between the moisture absorption/desorption member and the heat exchange unit. The circulation duct has an opening facing the moisture absorbing/releasing member. Here, there is a problem that the surface accuracy of the portion of the moisture absorbing and desorbing member that faces the opening of the circulation duct tends to be low due to, for example, warping of the moisture absorbing and desorbing member. Therefore, the gap between the moisture absorbing/releasing member and the opening of the circulation duct tends to increase, and there is a fear that it may become difficult to maintain the humidity of the air in the circulation duct appropriately. As a result, the refrigerant generation efficiency of the refrigerant generation unit may decrease.

One aspect of the projector of the present invention is a projector including an object to be cooled, which includes an optical modulation device that modulates light emitted from a light source, and a cooling device that cools the object by changing a coolant to gas. , wherein the cooling device includes a refrigerant generation unit that generates the refrigerant, and a refrigerant transmission unit that transmits the generated refrigerant toward the object to be cooled, and the refrigerant generation unit includes a rotating shaft a rotating moisture absorbing/releasing member; a first air blower for sending air to a first portion of the moisture absorbing/releasing member located in a first region; a heat exchanging portion connected to the refrigerant transmission portion; a heating unit for heating a second portion of the moisture absorbing/releasing member positioned in a second region different from the first region; a second air blower for sending air around the second portion to the inside of the heat exchanging portion; a circulation duct through which the air sent by the first blower passes; a circulation duct through which the air circulated between the second portion and the heat exchange portion by the second blower passes; and a reinforcing member, wherein the circulation duct has a first opening that opens toward the first portion, and the circulation duct has a second opening that opens toward the second portion. the first opening and the second opening are spaced apart in a circumferential direction around the rotation axis, and the reinforcing member includes the first opening and the second opening and the moisture absorbing/releasing member, and the side portion is provided with a plurality of through holes.

A first space is provided between one end of the first opening and one end of the second opening in the circumferential direction. A second space is provided between the two openings and the other end, and the dimension of the through-hole in the circumferential direction at the same position in the radial direction about the rotation axis is equal to that of the first space. It is good also as a structure smaller than the dimension of the said circumferential direction.

At the same position in the radial direction, the circumferential dimension of the through hole may be smaller than the circumferential dimension of the second space.

At the same position in the radial direction, the circumferential dimension of the through hole may be larger than the circumferential dimension of the second space.

The direction in which the moisture absorbing/releasing member rotates may be the direction from the first opening through the first space toward the second opening.

The direction in which the moisture absorbing/releasing member rotates may be the direction from the first opening through the second space toward the second opening.

The side portion includes an inner portion, an outer portion located outside the inner portion in the radial direction and surrounding the inner portion, and an outer portion extending in the radial direction to connect the inner portion and the outer portion. and a plurality of spokes arranged side by side at intervals in the direction, and the through holes may be provided between the spokes adjacent to each other in the circumferential direction.

The plurality of through holes include a first through hole, a second through hole whose position in the radial direction is different from that of the first through hole, and a third through hole whose position in the circumferential direction is different from that of the first through hole. , may be included.

The dimension of the first space in the circumferential direction increases toward the outer side in the radial direction. The circumferential dimension of the through hole may be larger than the circumferential dimension of the first through hole.

The reinforcing member may have a pair of side portions sandwiching the moisture absorbing/releasing member in the axial direction of the rotating shaft.

The reinforcing member may have a cylindrical portion surrounding the rotating shaft, and the moisture absorbing/releasing member may be fitted into the cylindrical portion.

The object to be cooled may include the optical modulator.

1 is a schematic configuration diagram showing a projector according to a first embodiment; FIG. 1 is a schematic diagram showing part of a projector according to a first embodiment; FIG. FIG. 2 is a schematic configuration diagram that schematically shows a refrigerant generation unit of the first embodiment; 1 is a perspective view showing a moisture absorbing/releasing member of a first embodiment; FIG. It is a perspective view which shows the reinforcement member of 1st Embodiment. It is the figure which looked at the reinforcement member of 1st Embodiment from the one side of the rotating shaft direction. FIG. 4 is a circumferential cross-sectional view showing the moisture absorbing/releasing member, the reinforcing member, the circulation duct, and the circulation duct of the first embodiment; It is a partial cross-sectional perspective view which shows the heat exchange part of 1st Embodiment. It is a perspective view which shows the light modulation unit and light combining optical system of 1st Embodiment. It is the figure which looked at the light modulation unit of 1st Embodiment from the light-incidence side. FIG. 11 is a diagram showing the optical modulation unit of the first embodiment, and is a cross-sectional view taken along the line XI-XI in FIG. 10; It is a figure which shows the refrigerant|coolant holding|maintenance part of 1st Embodiment. It is a figure which shows the 1st opening part and the 2nd opening part of 2nd Embodiment. It is the figure which looked at the reinforcement member of 3rd Embodiment from the one side of the rotating shaft direction. It is the figure which looked at the reinforcement member of 4th Embodiment from the one side of the rotating shaft direction.

Hereinafter, projectors according to embodiments of the present invention will be described with reference to the drawings. It should be noted that the scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Also, in the drawings below, the scale, number, etc. of each structure may be different from the scale, number, etc. of the actual structure in order to make each configuration easier to understand.

<First embodiment>
FIG. 1 is a schematic configuration diagram showing a projector 1 of this embodiment. FIG. 2 is a schematic diagram showing a part of the projector 1 of this embodiment. As shown in FIG. 1, the projector 1 includes a light source 2, a color separation optical system 3, a light modulation unit 4R, a light modulation unit 4G, a light modulation unit 4B, a light combining optical system 5, and a projection optical device 6. And prepare. The optical modulation unit 4R has an optical modulator 4RP. The light modulation unit 4G has a light modulation device 4GP. The light modulation unit 4B has a light modulation device 4BP.

The light source 2 emits illumination light WL adjusted to have a substantially uniform illuminance distribution toward the color separation optical system 3 . The light source 2 is, for example, a semiconductor laser. The color separation optical system 3 separates the illumination light WL from the light source 2 into red light LR, green light LG and blue light LB. The color separation optical system 3 includes a first dichroic mirror 7a, a second dichroic mirror 7b, a first reflecting mirror 8a, a second reflecting mirror 8b, a third reflecting mirror 8c, and a relay lens 8d. And prepare.

The first dichroic mirror 7a separates the illumination light WL emitted from the light source 2 into red light LR and mixed light of green light LG and blue light LB. The first dichroic mirror 7a has characteristics of transmitting red light LR and reflecting green light LG and blue light LB. The second dichroic mirror 7b separates the mixed light of green light LG and blue light LB into green light LG and blue light LB. The second dichroic mirror 7b has characteristics of reflecting the green light LG and transmitting the blue light LB.

The first reflecting mirror 8a is arranged in the optical path of the red light LR, and reflects the red light LR transmitted through the first dichroic mirror 7a toward the light modulator 4RP. The second reflecting mirror 8b and the third reflecting mirror 8c are arranged in the optical path of the blue light LB, and guide the blue light LB transmitted through the second dichroic mirror 7b to the light modulator 4BP.

Each of the light modulating device 4RP, the light modulating device 4GP, and the light modulating device 4BP is composed of a liquid crystal panel. The light modulator 4RP modulates the red light LR of the light emitted from the light source 2 according to the image signal. The light modulation device 4GP modulates the green light LG among the light emitted from the light source 2 according to the image signal. The light modulation device 4BP modulates the blue light LB among the light emitted from the light source 2 according to the image signal. Thereby, each of the light modulators 4RP, 4GP, and 4BP forms image light corresponding to each color light. Although not shown, polarizing plates are arranged on the light incident side and the light exiting side of each of the light modulators 4RP, 4GP, and 4BP.

A field lens 9R for collimating the red light LR incident on the light modulator 4RP is arranged on the light incident side of the light modulator 4RP. A field lens 9G for collimating the green light LG entering the light modulator 4GP is arranged on the light incident side of the light modulator 4GP. A field lens 9B for collimating the blue light LB incident on the light modulation device 4BP is arranged on the light incident side of the light modulation device 4BP.

The light synthesizing optical system 5 is composed of a substantially cubic cross dichroic prism. The light synthesizing optical system 5 synthesizes image light of each color from the light modulators 4RP, 4GP, and 4BP. The light synthesizing optical system 5 emits the synthesized image light toward the projection optical device 6 . The projection optical device 6 is composed of a projection lens group. The projection optical device 6 enlarges and projects the image light synthesized by the light synthesizing optical system 5, that is, the light modulated by the light modulators 4RP, 4GP, and 4BP toward the screen SCR. As a result, an enlarged color image (video) is displayed on the screen SCR.

The projector 1 further includes a cooling device 10 as shown in FIG. The cooling device 10 cools the object to be cooled provided in the projector 1 by changing the coolant W into gas. In this embodiment, the coolant W is, for example, liquid water. Therefore, in the following description, the change of the coolant W to gas may be simply referred to as vaporization. In this embodiment, objects to be cooled include the optical modulation units 4R, 4G, and 4B. That is, objects to be cooled in this embodiment include the optical modulators 4RP, 4GP, and 4BP.

The cooling device 10 has a refrigerant generation section 20 and a refrigerant transmission section 50 . The refrigerant generation unit 20 is a part that generates the refrigerant W. As shown in FIG. The coolant transmission unit 50 is a part that transmits the generated coolant W toward the object to be cooled. The refrigerant W sent to the object to be cooled, that is, the optical modulation units 4R, 4G, and 4B in this embodiment, is vaporized by the refrigerant transmission unit 50, thereby taking heat from the object to be cooled. Allow to cool. Each part will be described in detail below.

FIG. 3 is a schematic configuration diagram schematically showing the refrigerant generating section 20 of this embodiment. As shown in FIG. 3, the refrigerant generating unit 20 includes a moisture absorbing/releasing member 40, a reinforcing member 90, a motor (driving unit) 24, a first air blower 60, a circulation duct 28, a circulation duct 29, It has a heat exchange section 30 , a circulation duct 25 , a circulation duct 26 , a heating section 22 , a second blower 23 , and a third blower 61 .

FIG. 4 is a perspective view showing the moisture absorbing/releasing member 40. As shown in FIG. The moisture absorbing/releasing member 40 has a flat cylindrical shape centered on the rotation axis R, as shown in FIG. A central hole 40 c centered on the rotation axis R is formed in the center of the moisture absorbing/releasing member 40 . The central hole 40c penetrates the moisture absorbing/releasing member 40 in the axial direction of the rotation axis R. As shown in FIG. The moisture absorbing/releasing member 40 rotates around the rotation axis R. As shown in FIG. In the following description, the axial direction of the rotation axis R will be referred to as the "rotational axis direction DR" and will be indicated as the DR axis in the drawings as appropriate.

Also, the radial direction centered on the rotation axis R is simply referred to as the "radial direction". Also, the circumferential direction around the rotation axis R is simply referred to as the "circumferential direction" and is appropriately indicated by an arrow θ in the drawings. The direction in which the arrow .theta. In the present embodiment, the direction in which the moisture absorbing/releasing member 40 rotates (+θ direction) is clockwise when viewed from one side (+DR side) of the rotation axis direction DR. In the following description, the side to which the rotating moisture absorbing/releasing member 40 advances, that is, the side to which the arrow θ points (+θ side) is called the "front side in the circumferential direction", That is, the side opposite to the direction of the arrow θ (−θ side) is called the “rear side in the circumferential direction”.

The moisture absorbing/releasing member 40 has a large number of through holes 40b passing through the moisture absorbing/releasing member 40 in the rotational axis direction DR. The moisture absorbing/releasing member 40 is a porous member. The moisture absorbing/releasing member 40 has moisture absorbing/releasing properties. In the present embodiment, the moisture absorbing/releasing member 40 is formed by, for example, winding a belt-shaped belt-shaped member 40a having a through hole 40b around the rotation axis R, and exposing a surface of the wound belt-shaped member 40a to the outside having a moisture absorbing/releasing property. is made by applying In addition, the surface exposed to the outside of the wound strip-shaped member 40a includes the outer surface of the moisture absorbing/releasing member 40, the inner peripheral surface of the central hole 40c, and the inner surface of the through hole 40b. Note that the moisture absorbing/releasing member 40 may be entirely made of a material having moisture absorbing/releasing properties. Moisture-absorbing and desorbing substances include, for example, zeolite and silica gel.

FIG. 5 is a perspective view showing the reinforcing member 90. FIG. FIG. 6 is a diagram of the reinforcing member 90 viewed from one side (+DR side) in the rotation axis direction DR. As shown in FIGS. 3, 5, and 6, the reinforcing member 90 is attached to the moisture absorbing/releasing member 40. As shown in FIGS. In this embodiment, the reinforcing member 90 has a flat cylindrical shape that accommodates the moisture absorbing/releasing member 40 therein. The material forming the reinforcing member 90 is, for example, stainless steel. As shown in FIG. 5 , the reinforcing member 90 has a pair of side portions 91 and 92 and a tubular portion 93 . The cylindrical portion 93 surrounds the rotation axis R. The tubular portion 93 has a cylindrical shape centered on the rotation axis R. As shown in FIG. A moisture absorbing/releasing member 40 is fitted in the cylindrical portion 93 . The inner peripheral surface of the tubular portion 93 is in contact with the outer peripheral surface of the moisture absorbing/releasing member 40 .

The pair of side portions 91 and 92 are provided at both end portions of the cylindrical portion 93 in the rotation axis direction DR. A pair of side portions 91 and 92 are connected via a cylindrical portion 93 . At least one of the pair of side portions 91 and 92 is, for example, a separate member from the tubular portion 93 and fixed to the tubular portion 93 . The side portion 92 is arranged on one side (+DR side) of the side portion 91 in the rotation axis direction DR with a space therebetween. The pair of side portions 91 and 92 sandwich the moisture absorbing/releasing member 40 in the rotation axis direction DR. The side portion 91 is arranged to face the other side (-DR side) of the moisture absorbing/releasing member 40 in the rotation axis direction DR. The side portion 92 is arranged to face one side of the moisture absorbing/releasing member 40 in the rotation axis direction DR. The side portion 91 is in contact with the surface of the moisture absorbing/releasing member 40 on the other side in the rotation axis direction DR. The side portion 92 is in contact with the surface of the moisture absorbing/releasing member 40 on one side in the rotation axis direction DR.

Side portion 91 has an inner portion 91a, an outer portion 91b, and a plurality of spoke portions 91c. In this embodiment, the inner portion 91a has an annular shape centered on the rotation axis R. As shown in FIG. For example, the inner edge of the inner portion 91a substantially matches the inner edge of the center hole 40c when viewed in the rotation axis direction DR. In this embodiment, the outer portion 91b has an annular shape centered on the rotation axis R. As shown in FIG. The inner diameter of the outer portion 91b is larger than the outer diameter of the inner portion 91a. The outer portion 91b is positioned radially outward of the inner portion 91a. The outer portion 91b surrounds the inner portion 91a. The outer edge of the outer portion 91b is connected to the end of the cylindrical portion 93 on the other side (-DR side) in the rotation axis direction DR.

A plurality of spoke portions 91c extend radially to connect the inner portion 91a and the outer portion 91b. The plurality of spoke portions 91c are arranged side by side at intervals in the circumferential direction. The plurality of spoke portions 91c are arranged at regular intervals along the circumferential direction. The number of spokes 91c is not particularly limited. Through holes 91d are provided between the spokes 91c adjacent to each other in the circumferential direction. Thereby, the side portion 91 is provided with a plurality of through holes 91d. A plurality of through holes 91d are provided along the circumferential direction. The inner edge of the through hole 91d is formed by the circumferential edge of a pair of spokes 91c adjacent in the circumferential direction, the outer edge of the inner portion 91a, and the inner edge of the outer portion 91b. As shown in FIG. 6, in the present embodiment, the circumferential dimension L1a of the through hole 91d increases from the radially inner side toward the radially outer side. In this embodiment, the through hole 91d is a substantially fan-shaped hole.

In this embodiment, the shape of the side portion 92 is the same as the shape of the side portion 91 . Side portion 92 has an inner portion 92a, an outer portion 92b, and a plurality of spoke portions 92c. The number of spokes 92c is not particularly limited. Through holes 92d are provided between the spokes 92c adjacent to each other in the circumferential direction. Thereby, the side portion 92 is provided with a plurality of through holes 92d. A plurality of through holes 92d are provided along the circumferential direction. The shape of the through hole 92d is the same as the shape of the through hole 91d. A circumferential dimension L2a of the through hole 92d increases from the radially inner side to the radially outer side.

A surface of the side portion 91 on the other side (−DR side) in the rotation axis direction DR may be provided with unevenness. In this case, the dimension of the unevenness in the rotation axis direction DR is, for example, smaller than half the dimension of the through hole 91d in the rotation axis direction DR. The dimension of the through hole 91 d in the rotation axis direction DR is the dimension of the side portion 91 in the rotation axis direction DR. In addition, unevenness may be provided on the surface of the side portion 92 on one side (+DR side) in the rotation axis direction DR. In this case, the dimension of the unevenness in the rotation axis direction DR is, for example, smaller than half the dimension of the through hole 92d in the rotation axis direction DR. The dimension of the through hole 92 d in the rotation axis direction DR is the dimension of the side portion 92 in the rotation axis direction DR.

The output shaft of the motor 24 shown in FIG. 3 is inserted into the center hole 40c of the moisture absorbing/releasing member 40 and fixed. The motor 24 rotates the moisture absorbing/releasing member 40 around the rotation axis R. As shown in FIG. The rotational speed of the moisture absorbing/releasing member 40 rotated by the motor 24 is, for example, about 0.2 rpm or more and 5 rpm or less.

The circulation duct 28 and the circulation duct 29 are ducts through which the air AR1 sent by the first air blower 60 passes. The circulation duct 28 and the circulation duct 29 extend in the rotation axis direction DR. The circulation duct 28 is located on the other side (-DR side) of the moisture absorbing/releasing member 40 in the rotation axis direction DR. The circulation duct 29 is located on one side (+DR side) of the moisture absorbing/releasing member 40 in the rotational axis direction DR. The circulation duct 28 has a first opening 28a that opens toward a first portion of the moisture absorbing/releasing member 40 located in the first region F1. The circulation duct 29 has a first opening 29a that opens toward a first portion of the moisture absorbing/releasing member 40 located in the first region F1.

The first area F1 is an area to which air is sent from the first blower 60, and is an area between the first openings 28a and 29a in the rotation axis direction DR. The first opening 28a is an end portion on one side (+DR side) of the circulation duct 28 in the rotation axis direction DR, and is open on one side in the rotation axis direction DR. The first opening 29a is an end portion on the other side (−DR side) of the circulation duct 29 in the rotation axis direction DR, and opens on the other side in the rotation axis direction DR. As shown in FIG. 6, in this embodiment, the first openings 28a and 29a extend in an arc shape along the circumferential direction. The circumferential angle of the arcuate first openings 28a and 29a is, for example, greater than 180 degrees.

The radially inner edges of the first openings 28 a and 29 a are arcuate around the rotation axis R and positioned slightly radially outside the inner portions 91 a and 92 a of the reinforcing member 90 . The radial outer edges of the first openings 28 a and 29 a are arcuate around the rotation axis R and positioned slightly radially inward of the outer portions 91 b and 92 b of the reinforcing member 90 . Edges on both sides in the circumferential direction of the first openings 28a and 29a extend linearly in the radial direction. In this embodiment, the shape of the first opening 28a and the shape of the first opening 29a are the same. The entire first opening 28a and the entire first opening 29a overlap each other when viewed in the rotation axis direction DR.

FIG. 7 is a circumferential cross-sectional view showing the moisture absorbing/releasing member 40, the reinforcing member 90, the circulation ducts 28 and 29, and the circulation ducts 25 and 26. As shown in FIG. As shown in FIG. 7, a side portion 91 of the reinforcing member 90 is arranged between the first opening 28a and the moisture absorbing/releasing member 40 in the rotational axis direction DR. The first opening 28a is in contact with the surface of the side portion 91 on the other side (-DR side) in the rotation axis direction DR. The first opening 28a faces the moisture absorbing/releasing member 40 in the rotation axis direction DR via a plurality of through holes 91d. A side portion 92 of the reinforcing member 90 is arranged between the first opening 29a and the moisture absorbing/releasing member 40 in the rotation axis direction DR. The first opening 29a is in contact with a surface of the side portion 92 on one side (+DR side) in the rotation axis direction DR. The first opening 29a faces the moisture absorbing/releasing member 40 in the rotation axis direction DR via a plurality of through holes 92d.

The first air blower 60 shown in FIG. 3 is, for example, an intake fan that draws outside air into the projector 1 . As shown in FIG. 3, the first air blower 60 sends air AR1 to the first portion of the moisture absorbing/releasing member 40 located in the first area F1. In this embodiment, the air AR1 sent from the first air blower 60 flows through the circulation duct 28 and is sent to the moisture absorbing/releasing member 40 through the first opening 28a. The air AR1 sent to the moisture absorbing/releasing member 40 passes through the moisture absorbing/releasing member 40 and flows into the circulation duct 29 from the first opening 29a.

As shown in FIG. 2, the first air blower 60 also sends air AR1 to the optical modulation units 4R, 4G, and 4B to be cooled. That is, in the present embodiment, the first blower device 60 is a cooling blower device that sends the air AR1 to the object to be cooled. The first blower 60 is not particularly limited as long as it can send the air AR1, and may be, for example, an axial fan or a centrifugal fan.

The heat exchange portion 30 is a portion where the refrigerant W is generated. The heat exchange section 30 is connected to the refrigerant transmission section 50 . FIG. 8 is a partial cross-sectional perspective view showing the heat exchange section 30. As shown in FIG. As shown in FIG. 8 , the heat exchange section 30 has a housing 31 , a plurality of flow path sections 34 , an inflow duct 32 and an outflow duct 33 .

In this embodiment, the housing 31 has a rectangular parallelepiped box shape. The housing 31 has an internal space 35, an inflow hole portion 31a, and an outflow hole portion 31b. Air sent by the second blower 23 flows into the internal space 35 . The inflow hole portion 31a is provided in a side wall portion 31c on one side (+DR side) of the housing 31 in the rotation axis direction DR. The outflow hole portion 31b is provided in a side wall portion 31d on the other side (-DR side) of the housing 31 in the rotation axis direction DR. The inflow hole portion 31 a and the outflow hole portion 31 b are connected to the internal space 35 . The inflow hole portion 31a and the outflow hole portion 31b are rectangular, for example. In the present embodiment, the inflow hole portion 31a and the outflow hole portion 31b overlap each other when viewed along the rotation axis direction DR.

The plurality of flow path portions 34 are arranged within the internal space 35 . Air sent by a third air blower 61 , which will be described later, circulates inside the plurality of flow path portions 34 . In the present embodiment, the plurality of channel portions 34 are conduits extending linearly. The channel part 34 is cylindrical, for example. The channel portion 34 is open on both sides in the extending direction. The plurality of flow path portions 34 extend in directions parallel to each other, for example. The direction in which the flow path part 34 extends is, for example, orthogonal to the rotation axis direction DR. In the following description, the direction in which the flow path portion 34 extends will be referred to as an "extending direction DE" and will be indicated by the DE axis in the drawings as appropriate.

In this specification, the phrase "a plurality of flow path sections extending in a direction parallel to each other" refers to the case where the plurality of flow path sections extend strictly parallel to each other, as well as the case where the plurality of flow path sections It also includes the case where they extend in directions substantially parallel to each other. The phrase "a plurality of flow passages extending in directions substantially parallel to each other" includes, for example, the case where the angle formed by the flow passages is within about 10°.

In the present embodiment, the flow path portion 34 is provided with a plurality of rows arranged along the rotation axis direction DR along a direction orthogonal to both the rotation axis direction DR and the extending direction DE. In the following description, the direction orthogonal to both the rotation axis direction DR and the stretching direction DE is called a "thickness direction DT" and is indicated by the DT axis in the drawings as appropriate. The plurality of flow path portions 34 form, for example, four rows arranged in the thickness direction DT. Flow path portions 34 included in one row of adjacent rows in thickness direction DT are positioned between flow path portions 34 included in the other row in rotation axis direction DR. That is, the plurality of flow passage portions 34 are arranged in a zigzag pattern when viewed along the extension direction DE.

As shown in FIG. 3, the flow path portion 34 extends from a side wall portion 31e on the other side (−DE side) of the housing 31 in the extending direction DE to one side (+DE side) of the housing 31 in the extending direction DE. extends to the side wall portion 31f of the . The end portion of the flow path portion 34 on the other side (−DE side) in the extending direction DE is an inlet 34 a that opens to the surface of the side wall portion 31 e on the other side in the extending direction DE and opens to the outside of the housing 31 . be. An end portion of the channel portion 34 on one side in the extending direction DE (+DE side) is an outflow port 34b that opens to the surface of the side wall portion 31f on one side in the extending direction DE and opens to the outside of the housing 31. . Thereby, the flow path part 34 connects the spaces located on both sides of the housing 31 in the extending direction DE. On the other hand, the insides of the plurality of flow path portions 34 are not connected to the internal space 35 . As a result, the air flowing inside the flow passages 34 and the air flowing into the internal space 35 do not mix. In other words, the inside of the plurality of flow path portions 34 is isolated from the internal space 35 .

The inflow duct 32 and the outflow duct 33 are ducts extending in the extension direction DE. In this embodiment, the inflow duct 32 and the outflow duct 33 are rectangular tubular. The inflow duct 32 and the outflow duct 33 are arranged across the housing 31 in the extension direction DE, and are connected to the housing 31 respectively. The inflow duct 32 is located on the other side (-DE side) of the housing 31 in the extending direction DE. Outflow duct 33 is located on one side (+DE side) of housing 31 in extension direction DE.

One end (+DE side) of the inflow duct 32 in the extending direction DE is fixed to the outer peripheral edge of the side wall portion 31e and closed by the side wall portion 31e. Inside the inflow duct 32, the inflow ports 34a of the plurality of flow path portions 34 are open. Thereby, the inside of the inflow duct 32 is connected to the insides of the plurality of flow passage portions 34 via the inflow port 34a.

The end of the outflow duct 33 on the other side (-DE side) in the extending direction DE is fixed to the outer peripheral edge of the side wall 31f and closed by the side wall 31f. Inside the outflow duct 33, the outflow ports 34b of the plurality of flow passage portions 34 are open. Thereby, the inside of the outflow duct 33 is connected to the insides of the plurality of flow passage portions 34 via the outflow port 34b.

The circulation duct 25 is a duct arranged on the other side (-DR side) of the moisture absorbing/releasing member 40 in the rotational axis direction DR. The circulation duct 25 extends from the other side of the moisture absorbing/releasing member 40 in the rotational axis direction DR to the other side of the housing 31 in the rotational axis direction DR. The circulation duct 25 has a second opening 25a that opens on one side (+DR side) in the rotational axis direction DR toward a second portion of the moisture absorbing/releasing member 40 located in a second area F2 different from the first area F1. have The second area F2 is an area to which air is sent from the second blower 23, and is an area between the second opening 25a and a second opening 26a of the circulation duct 26, which will be described later, in the rotation axis direction DR. As shown in FIG. 6, the second area F2 is an area spaced apart from the first area F1 in the circumferential direction. As shown in FIG. 3, the second opening 25a is one end of the circulation duct 25. As shown in FIG. The other end 25 b of the circulation duct 25 is connected to the outflow hole 31 b of the housing 31 and opens to the internal space 35 . Thereby, the inside of the circulation duct 25 is connected to the internal space 35 .

The circulation duct 26 is a duct arranged on one side (+DR side) of the moisture absorbing/releasing member 40 in the rotational axis direction DR. The circulation duct 26 extends from one side of the moisture absorbing/releasing member 40 in the rotational axis direction DR to one side of the housing 31 in the rotational axis direction DR. The circulation duct 26 has a second opening 26a that opens on the other side (-DR side) in the rotation axis direction DR toward the second portion of the moisture absorbing/releasing member 40 located in the second region F2. The second opening 26 a is one end of the circulation duct 26 . The other end portion 26b of the circulation duct 26 is connected to the inflow hole portion 31a of the housing 31 and opens to the internal space 35 . Thereby, the inside of the circulation duct 26 is connected to the internal space 35 .

As shown in FIG. 6, in this embodiment, the second openings 25a and 26a extend in an arc shape along the circumferential direction. The circumferential angle of the arc-shaped second openings 25a and 26a is, for example, smaller than 180°. The radially inner edges of the second openings 25 a and 26 a are arcuate around the rotation axis R and positioned slightly radially outside the inner portions 91 a and 92 a of the reinforcing member 90 . The radial outer edges of the second openings 25 a and 26 a are arcuate around the rotation axis R and positioned slightly radially inward of the outer portions 91 b and 92 b of the reinforcing member 90 . Edges on both sides in the circumferential direction of the second openings 25a and 26a extend linearly in the radial direction. In this embodiment, the shape of the second opening 25a and the shape of the second opening 26a are the same. The entire second opening 25a and the entire second opening 26a overlap each other when viewed in the rotation axis direction DR.

As shown in FIG. 7, a side portion 91 of the reinforcing member 90 is arranged between the second opening 25a and the moisture absorbing/releasing member 40 in the rotational axis direction DR. The second opening 25a is in contact with the surface of the side portion 91 on the other side (−DR side) in the rotation axis direction DR. The second opening 25a faces the moisture absorbing/releasing member 40 in the rotation axis direction DR via a plurality of through holes 91d. A side portion 92 of the reinforcing member 90 is arranged between the second opening 26a and the moisture absorbing/releasing member 40 in the rotation axis direction DR. The second opening 26a is in contact with a surface of the side portion 92 on one side (+DR side) in the rotation axis direction DR. The second opening 26a faces the moisture absorbing/releasing member 40 in the rotation axis direction DR via a plurality of through holes 92d.

The first opening 28a and the second opening 25a are spaced apart in the circumferential direction around the rotation axis R. As shown in FIG. As shown in FIG. 6, a first space S1a is provided between one end of the first opening 28a and one end of the second opening 25a in the circumferential direction. A second space S2a is provided between the other end of the first opening 28a and the other end of the second opening 25a in the circumferential direction. The first space S1a is provided between the circumferential front (+θ side) end of the first opening 28a and the circumferential rear (−θ) end of the second opening 25a. ing. The second space S2a is provided between the circumferential front (+θ side) end of the second opening 25a and the circumferential rear (−θ) end of the first opening 28a. ing. In the present embodiment, the direction in which the moisture absorbing/releasing member 40 rotates (+θ direction) is the direction from the first opening 28a through the first space S1a toward the second opening 25a.

In the present embodiment, the first space S1a and the second space S2a have the same shape and size, except that they are located at different positions in the circumferential direction. A circumferential dimension L3a of the first space S1a and a circumferential dimension L4a of the second space S2a increase radially outward. At the same position in the radial direction, the circumferential dimension L3a of the first space S1a and the circumferential dimension L4a of the second space S2a are the same.

The first space S1a and the second space S2a face part of the plurality of through holes 91d in the reinforcing member 90 attached to the rotating moisture absorbing/releasing member 40 in the rotation axis direction DR. In this embodiment, at the same position in the radial direction about the rotation axis R, the circumferential dimension L1a of the through hole 91d is the same as the circumferential dimension L3a of the first space S1a and the circumferential dimension L3a of the second space S2a. smaller than dimension L4a. The circumferential dimension L1a at the radially outer end of the through hole 91d is, for example, the circumferential dimension L3a at the radially inner end of the first space S1a and the radially inner end of the second space S2a. It is larger than the circumferential dimension L4a.

The first opening 29a and the second opening 26a are spaced apart in the circumferential direction around the rotation axis R. As shown in FIG. A first space S1b is provided between one end of the first opening 29a and one end of the second opening 26a in the circumferential direction. A second space S2b is provided between the other end of the first opening 29a and the other end of the second opening 26a in the circumferential direction. The first space S1b is provided between the circumferential front (+θ side) end of the first opening 29a and the circumferential rear (−θ) end of the second opening 26a. ing. The second space S2b is provided between the circumferential front (+θ side) end of the second opening 26a and the circumferential rear (−θ) end of the first opening 29a. ing. In the present embodiment, the direction in which the moisture absorbing/releasing member 40 rotates (+θ direction) is the direction from the first opening 29a through the first space S1b toward the second opening 26a.

In this embodiment, the first space S1b and the second space S2b have the same shape and size, except that they are located at different positions in the circumferential direction. A circumferential dimension L3b of the first space S1b and a circumferential dimension L4b of the second space S2b increase radially outward. At the same position in the radial direction, the circumferential dimension L3b of the first space S1b and the circumferential dimension L4b of the second space S2b are the same.

The first space S1b and the second space S2b face a part of the plurality of through holes 92d in the reinforcing member 90 attached to the rotating moisture absorbing/releasing member 40 in the rotation axis direction DR. In this embodiment, at the same position in the radial direction about the rotation axis R, the circumferential dimension L2a of the through hole 92d is the same as the circumferential dimension L3b of the first space S1b and the circumferential dimension L3b of the second space S2b. smaller than dimension L4b. The circumferential dimension L2a at the radially outer end of the through hole 92d is, for example, the circumferential dimension L3b at the radially inner end of the first space S1b and the radially inner end of the second space S2b. It is larger than the circumferential dimension L4b.

In the present embodiment, the entire first space S1a and the entire first space S1b overlap each other when viewed in the rotation axis direction DR. The entire second space S2a and the entire second space S2b overlap each other when viewed in the rotation axis direction DR.

As shown in FIG. 3, the heating section 22 has a heating body section 22a. The heating main body 22 a is arranged inside the circulation duct 25 . The heating body portion 22a is arranged on the other side (-DR side) of the second portion of the moisture absorbing/releasing member 40 located in the second region F2 in the rotation axis direction DR. The heating body portion 22a is, for example, an electric heater. The heating main body 22 a heats the atmosphere (air) inside the circulation duct 25 . In this embodiment, the heating section 22 has a second air blower 23 .

The second blower 23 is arranged inside the circulation duct 26 . The second blower 23 is arranged on one side (+DR side) of the second portion of the moisture absorbing/releasing member 40 located in the second region F2 in the rotation axis direction DR. The second blower 23 is, for example, a centrifugal fan. The second blower 23 discharges the air sucked from the other side (-DR side) in the rotation axis direction DR to the other side (-DE side) in the extending direction DE from the exhaust port 23a. The air discharged from the exhaust port 23a flows into the internal space 35 of the housing 31 through the inflow hole portion 31a. That is, the second blower 23 sends air to the internal space 35 through the inflow hole portion 31a. Note that the second blower 23 may be, for example, an axial fan.

The air discharged from the second blower 23 into the internal space 35 is the air taken in from the other side (-DR side) of the second blower 23 in the rotation axis direction DR through the second opening 26a of the circulation duct 26. is the air that has passed through the second portion of the moisture absorbing/releasing member 40 located in the second region F2. That is, the second blower 23 passes the air through the second portion of the moisture absorbing/releasing member 40 located in the second area F2 different from the first area F1, and sends the air to the heat exchanging section 30. As shown in FIG. In this embodiment, the air flows inside the circulation duct 25 before passing through the second portion of the moisture absorbing/releasing member 40 located in the second region F2. Therefore, the heating body portion 22a heats the air before passing through the second portion of the moisture absorbing/desorbing member 40 located in the second region F2.

As described above, in the present embodiment, the heating unit 22 sends the air heated by the heating main unit 22a to the second part of the moisture absorbing/releasing member 40 located in the second area F2 by the second blower 23. , heats the second portion of the moisture absorbing/releasing member 40 located in the second region F2. Thereby, the second air blower 23 sends the air around the second portion of the moisture absorbing/releasing member 40 heated by the heating portion 22 to the inside of the heat exchanging portion 30 .

The air that has flowed into the internal space 35 of the heat exchange unit 30 from the second blower 23 passes through the internal space 35 in the rotational axis direction DR and flows into the circulation duct 25 via the outflow hole portion 31b. The air that has flowed into the circulation duct 25 is heated by the heating body portion 22a, passes through the second portion of the moisture absorbing/releasing member 40 located in the second region F2 again, flows into the circulation duct 26, and flows into the second region. Air is sucked into the air blower 23 .

As described above, in the present embodiment, the refrigerant generation section 20 has the circulation path 27 through which the air released from the second blower 23 circulates. The circulation path 27 is composed of at least the circulation ducts 25 and 26 and the heat exchange section 30 . That is, the air circulated between the second portion of the moisture absorbing/releasing member 40 and the heat exchanging portion 30 by the second blower 23 passes through the circulation ducts 25 and 26 . The circulation path 27 passes through the heating body portion 22 a, the moisture absorbing/releasing member 40 and the internal space 35 . The circulation path 27 is substantially closed, and air from the outside is prevented from flowing into the circulation path 27 . In the following description, the air discharged from the second blower 23 and circulating in the circulation path 27 is called air AR2.

In this embodiment, the third blower device 61 is arranged inside the inflow duct 32 . The third blower 61 may be an axial fan or a centrifugal fan. The third blower 61 discharges cooling air AR3 to one side (+DE side) in the extension direction DE within the inflow duct 32 . The released cooling air AR3 flows into the flow path portion 34 through the inlet 34a. That is, in the present embodiment, the third blower 61 sends the cooling air AR3 from the inflow port 34a through the inflow duct 32 to the inside of the plurality of flow passages 34 . Thereby, the cooling air AR3 circulates inside the plurality of flow path portions 34 . The cooling air AR3 passing through the interior of the flow path portion 34 cools the air AR2 in the internal space 35 via the flow path portion 34 . In this manner, the third blower 61 can cool the air AR2 flowing into the internal space 35 via the flow path section 34 by sending the cooling air AR3 into the flow path section 34 . The cooling air AR3 sent to the interior of the flow path portion 34 flows out into the interior of the outflow duct 33 from the outflow port 34b.

When the air AR1 is sent from the first blower 60 to the first portion of the moisture absorbing/releasing member 40 located in the first area F1, the water vapor contained in the air AR1 is transferred to the moisture absorbing/releasing member 40 located in the first area F1. Moisture is absorbed in the first part of The first portion of the moisture absorbing/releasing member 40 that has absorbed water vapor moves from the first area F1 to the second area F2 as the moisture absorbing/releasing member 40 is rotated by the motor 24 . Air AR2 having a relatively high temperature heated by the heating main body 22a passes through the second portion of the moisture absorbing/releasing member 40 located in the second region F2. As a result, the moisture absorbed by the moisture absorbing/releasing member 40 is vaporized and released into the air AR2.

Air AR<b>2 containing moisture absorbed from air AR<b>1 by passing through moisture absorbing/releasing member 40 is sent to internal space 35 of heat exchanging section 30 by second blower 23 . The relatively high-temperature air AR2 sent to the internal space 35 circulates in the internal space 35 in a direction intersecting with the extension direction DE of the plurality of flow passages 34, and passes through the inside of the plurality of flow passages 34 as cooling air. Cooled by AR3. As a result, the water vapor contained in the air AR2 is condensed into liquid water, that is, the refrigerant W. In this way, in the housing 31 of the heat exchange unit 30, that is, in the internal space 35, the air AR2 that has flowed into the internal space 35 is cooled by the cooling air AR3 sent into the plurality of flow passages 34. , the coolant W is generated from the air AR2 that has flowed into the internal space 35 . The generated coolant W is stored in the housing 31 .

In the present embodiment, the refrigerant transmission section 50 is made of a porous member and transmits the refrigerant W by capillary action. Examples of the material of the refrigerant transmission section 50 include polypropylene, cotton, porous metal, and the like. The material of the refrigerant transmission part 50 is preferably a material that can relatively increase the surface tension of the refrigerant transmission part 50 .

The refrigerant transmission section 50 has a connection section 54 connected to the housing 31 . The connecting portion 54 is a portion that connects the housing 31 and the object to be cooled. As described above, in this embodiment, the refrigerant transmission section 50 is made of a porous member, so the connection section 54 is made of a porous member. An end portion 54 a connected to the housing 31 at the connection portion 54 is exposed to the internal space 35 . The connecting portion 54 protrudes from the internal space 35 of the housing 31 to the outside of the housing 31 through the side wall portion 31 d of the housing 31 . The connecting portion 54 is thin strip-shaped. As shown in FIG. 9, the connecting portion 54 protruding outside the housing 31 extends to the optical modulation unit 4G to be cooled. FIG. 9 is a perspective view showing the light modulation units 4R, 4G, and 4B and the light synthesizing optical system 5. As shown in FIG.

Next, the optical modulation units 4R, 4G, and 4B to be cooled in this embodiment will be described in more detail. In the following description, the vertical direction Z, with the positive side as the upper side and the negative side as the lower side, is indicated by the Z axis in the drawings. The direction parallel to the optical axis AX of the projection lens closest to the light exit side in the projection optical device 6, that is, the direction parallel to the projection direction of the projection optical device 6 is referred to as the "optical axis direction X" and is appropriately indicated by the X axis in the drawings. . The optical axis direction X is perpendicular to the vertical direction Z. As shown in FIG. Also, a direction perpendicular to both the optical axis direction X and the vertical direction Z is called a "width direction Y" and indicated as the Y axis in the drawings.

Note that the vertical direction Z, the upper side, and the lower side are simply names for explaining the relative positional relationship of each part, and the actual arrangement relationship, etc., is other than the arrangement relationship, etc. indicated by these names. There may be.

FIG. 10 is a diagram of the light modulation unit 4G viewed from the light incident side. FIG. 11 is a diagram showing the optical modulation unit 4G, and is a cross-sectional view taken along line XI-XI in FIG.
The light modulating unit 4R, the light modulating unit 4G, and the light modulating unit 4B, which are to be cooled, are arranged to surround the light combining optical system 5, as shown in FIG. The light modulation unit 4R and the light modulation unit 4B are arranged on opposite sides of each other with the light combining optical system 5 interposed in the width direction Y. As shown in FIG. The light modulation unit 4G is arranged on the light incident side (-X side) of the light combining optical system 5 in the optical axis direction X. As shown in FIG. The structure of the light modulation unit 4R, the structure of the light modulation unit 4G, and the structure of the light modulation unit 4B are the same except for the different positions and postures. Only the modulation unit 4G may be described.

The light modulation unit 4G has a holding frame 80 that holds the light modulation device 4GP. As shown in FIGS. 9, 10, and 11, the holding frame 80 has a substantially rectangular parallelepiped shape that is flat in the direction in which light enters the light modulator 4GP and elongated in the vertical direction Z. As shown in FIG. The direction in which the light of the optical modulator 4GP is incident is the optical axis direction X, for example.

As shown in FIG. 11, the holding frame 80 has a through hole 81 passing through the holding frame 80 in the direction in which light is incident. A stepped portion 83 that widens the width of the through hole 81 is provided at the edge of the through hole 81 on the light incident side (−X side). The light modulation device 4GP is fitted in the stepped portion 83 and held by the holding frame 80 . As shown in FIG. 10, insertion grooves 82a and 82b are formed on both sides in the up-down direction Z on the surface of the holding frame 80 on the light incident side.

As shown in FIGS. 9, 10, and 11, the projector 1 further includes a cooling promoting section 70 provided in the light modulation unit 4G to be cooled. The cooling promotion section 70 has a refrigerant holding section 71 and a fixing member 72 . The coolant holding portion 71 is attached to the surface of the holding frame 80 of the optical modulation unit 4G to be cooled. In this embodiment, the coolant holding portion 71 is provided on the surface of the holding frame 80 on the light incident side (−X side) of the optical modulator 4GP. The coolant holding portion 71 is made of a porous member that holds the coolant W. As shown in FIG. Examples of the material of the coolant holding portion 71 include polypropylene, cotton, porous metal, and the like. The material of the coolant holding portion 71 can be the same as the material of the coolant transmission portion 50, for example. The material of the coolant holding portion 71 is preferably a material that allows the surface tension of the coolant holding portion 71 to be relatively large.

FIG. 12 is a diagram showing the coolant holding portion 71. As shown in FIG. As shown in FIG. 12, the coolant holding portion 71 has a rectangular frame-shaped body portion 71a, and insertion portions 71b and 71c provided at both ends in the vertical direction Z of the body portion 71a. As shown in FIG. 11, the body portion 71a partially covers the surface of the holding frame 80 on the light incident side (−X side) of the light modulation device 4GP. The inner edge side portion of the main body portion 71a covers the outer edge portion of the optical modulator 4GP. The insertion portion 71 b is bent and inserted into the insertion groove 82 a of the holding frame 80 . The insertion portion 71 c is bent and inserted into the insertion groove 82 b of the holding frame 80 .

The fixing member 72 is a member that fixes the coolant holding portion 71 . The fixing member 72 is a plate-like member, as shown in FIGS. 9 and 11 . The fixing member 72 is made of metal, for example. The fixing member 72 has a rectangular frame-shaped frame portion 72a, a mounting portion 72b, and an insertion portion 72c. The frame portion 72a covers the outer edge portion of the coolant holding portion 71, as shown in FIGS. The holding frame 80, the coolant holding portion 71, and the frame portion 72a are stacked in the direction of light passing through the light modulation unit 4G (optical axis direction X). In the following description, the direction in which the holding frame 80, the refrigerant holding portion 71, and the frame portion 72a are overlapped is simply referred to as the "overlapping direction." The fixing member 72 sandwiches the coolant holding portion 71 in the stacking direction (optical axis direction X) with the holding frame 80 by the frame portion 72a.

The inner edge of the frame portion 72 a is provided outside the inner edge of the coolant holding portion 71 . Therefore, a portion of the coolant holding portion 71, that is, a portion inside the frame portion 72a in this embodiment, is exposed when viewed from the fixing member 72 side in the stacking direction.

As shown in FIGS. 9 and 11, the mounting portions 72b are provided at both ends in the width direction Y of both ends in the vertical direction Z of the frame portion 72a. The mounting portion 72b protrudes from the frame portion 72a toward the holding frame 80 (+X side). The mounting portion 72b is engaged with a projection provided on the side surface of the holding frame 80. As shown in FIG. Thereby, the fixing member 72 is fixed to the holding frame 80 .

The insertion portions 72c are provided at both ends in the vertical direction Z of the frame portion 72a. The insertion portion 72c protrudes from the frame portion 72a toward the holding frame 80 (+X side). The insertion portion 72c is inserted into the insertion grooves 82a and 82b of the holding frame 80. As shown in FIG. The insertion portion 72c presses the insertion portions 71b and 71c of the coolant holding portion 71 inside the insertion grooves 82a and 82b.

The cooling promoting section 70 is provided in each of the plurality of optical modulation units 4R, 4G, 4B. That is, the coolant holding portion 71 and the fixing member 72 are provided for each of the plurality of optical modulation units 4R, 4G, and 4B. As shown in FIG. 12, among the optical modulation units 4R, 4G, and 4B, the coolant holding section 71G provided in the optical modulation unit 4G is connected to the coolant transmission section 50. As shown in FIG. More specifically, the connection portion 54 of the refrigerant transmission portion 50 is connected to the lower end portion of the refrigerant holding portion 71G.

The refrigerant holding portion 71B attached to the optical modulation unit 4B and the refrigerant holding portion 71R attached to the optical modulation unit 4R are similar to the refrigerant holding portion 71B attached to the optical modulation unit 4G, except that the connecting portion 54 is not connected. It is the same as the part 71G.

In this embodiment, connecting portions 73a and 73b made of porous members are provided to connect the coolant holding portions 71 provided in the plurality of light modulation units 4R, 4G, and 4B to each other. In this embodiment, a coolant holding portion 71B attached to the optical modulation unit 4B and a coolant holding portion 71B attached to the optical modulation unit 4R are arranged on both sides of the coolant holding portion 71G attached to the optical modulation unit 4G via connecting portions 73a and 73b. 71R of refrigerant|coolant holding|maintenance parts which were carried out are connected.

The connecting portion 73a connects the coolant holding portion 71G attached to the optical modulation unit 4G and the coolant holding portion 71B attached to the optical modulation unit 4B. Thereby, the refrigerant holding portion 71B is connected to the connecting portion 54 of the refrigerant transmission portion 50 via the refrigerant holding portion 71G. As shown in FIG. 9, the connecting portion 73a is provided with a covering portion 74 that covers the connecting portion 73a. The covering portion 74 is, for example, a resin film or the like.

The connecting portion 73b connects the coolant holding portion 71 attached to the optical modulation unit 4G and the coolant holding portion 71 attached to the optical modulation unit 4R. Thereby, the refrigerant holding portion 71R is connected to the connection portion 54 of the refrigerant transmission portion 50 via the refrigerant holding portion 71G. Although illustration is omitted, the connecting portion 73b is also provided with the covering portion 74 in the same manner as the connecting portion 73a.

The refrigerant W generated by the refrigerant generation unit 20 is transmitted to the refrigerant holding unit 71G by the connection unit 54 of the refrigerant transmission unit 50. As shown in FIG. The refrigerant W transmitted to the refrigerant holding portion 71G is transmitted to the refrigerant holding portion 71B through the connecting portion 73a, and is also transmitted to the refrigerant holding portion 71R through the connecting portion 73b. In this manner, the coolant W generated by the coolant generator 20 is transmitted to the three optical modulation units 4R, 4G, and 4B. Then, the coolant W transmitted and held in the coolant holding portion 71 is vaporized, thereby cooling the optical modulation units 4R, 4G, and 4B to be cooled. More specifically, when the coolant W retained in the coolant retaining portion 71 is vaporized, the retaining frame 80 to which the coolant retaining portion 71 is attached is cooled. The held optical modulators 4RP, 4GP, 4BP are cooled. Thus, the cooling device 10 can cool the optical modulators 4RP, 4GP, and 4BP, which are objects to be cooled.

According to the present embodiment, the cooling device 10 transmits the refrigerant W generated by the refrigerant generation unit 20 to the object to be cooled by the refrigerant transmission unit 50, and utilizes the vaporization of the refrigerant W, which is an endothermic reaction, from the object to be cooled. It can take heat and cool the object to be cooled. Cooling by vaporization of the coolant W positively removes heat from the object to be cooled, and thus has superior cooling performance compared to the case of cooling the object to be cooled simply by heat transfer to the refrigerant, such as air cooling and liquid cooling. Thereby, when obtaining the same cooling performance as air cooling and liquid cooling, it is easier to downsize the entire cooling device 10 compared to air cooling and liquid cooling.

Further, in the case of cooling by vaporization of the coolant W, the cooling performance can be improved by increasing the surface area of the vaporized coolant W in contact with the object to be cooled. Therefore, even if the cooling performance of the cooling device 10 is increased, an increase in noise can be suppressed. As described above, according to the present embodiment, it is possible to obtain the projector 1 including the cooling device 10 that is excellent in cooling performance, small in size, and excellent in quietness.

Further, according to the present embodiment, since the refrigerant W can be generated in the refrigerant generation unit 20, the user does not need to replenish the refrigerant W, and convenience for the user can be improved. In addition, since the refrigerant generation unit 20 can adjust the amount of refrigerant W to be generated when necessary, it is not necessary to store the refrigerant W in a storage tank or the like, and the weight of the projector 1 can be reduced. can.

Further, according to the present embodiment, the moisture absorption/desorption member 40 can absorb the water vapor contained in the air AR1 sent from the first blower 60, and the moisture absorbed by the moisture absorption/desorption member 40 can be absorbed by the second blower 23. Moisture can be released as water vapor into the air AR2 sent. Then, the heat exchange unit 30 can condense the moisture released as water vapor into the air AR2 to generate the refrigerant W. Thereby, according to the present embodiment, the coolant W can be generated from the atmosphere inside the projector 1 .

Further, according to this embodiment, the end portion 54 a of the connection portion 54 of the refrigerant transmission portion 50 is exposed to the internal space 35 . Therefore, the end portion 54 a of the connection portion 54 can be brought into contact with the coolant W generated in the internal space 35 . And the connecting part 54 is made of a porous member. Therefore, the coolant W can be absorbed by the connection portion 54 via the end portion 54a and transmitted to the object to be cooled by capillary action. Thereby, the coolant W generated in the internal space 35 can be easily transmitted to the object to be cooled by the coolant transmission section 50 . In addition, there is no need to separately prepare a power source such as a pump for transmitting the coolant W. As a result, an increase in the number of parts of the projector 1 can be suppressed, and the size and weight of the projector 1 can be easily reduced.

Further, for example, in the refrigerant generation unit 20, when the humidity of the air AR2 sent from the second air blower 23 to the heat exchange unit 30 is relatively low, even if the heat exchange unit 30 is cooled, it is difficult to generate the refrigerant W. There is The humidity of the air AR2 sent to the heat exchange section 30 may decrease, for example, when the air outside the projector 1 or the like is mixed.

On the other hand, according to the present embodiment, the refrigerant generator 20 has the circulation path 27 through which the air AR2 discharged from the second blower 23 circulates. Therefore, by substantially sealing the circulation path 27, the air outside the projector 1 can be prevented from entering the circulation path 27, and the humidity of the air AR2 sent to the heat exchange section 30 can be easily maintained in a relatively high state. Therefore, by cooling the internal space 35 via the plurality of flow path portions 34, the coolant W can be suitably generated.

Here, the portions of the moisture absorbing/releasing member 40 that face the second openings 25a and 26a of the circulation ducts 25 and 26 tend to have low surface accuracy due to, for example, warping of the moisture absorbing/releasing member 40. I had a problem. As a result, the gap between the moisture absorbing/releasing member 40 and the second openings 25a and 26a of the circulation ducts 25 and 26 tends to increase, making it difficult to substantially seal the circulation path 27 in some cases. Therefore, if the air AR2 in the circulation ducts 25 and 26 leaks to the outside, or the air outside the projector 1 is mixed in the circulation ducts 25 and 26, the humidity of the air AR2 in the circulation ducts 25 and 26 may be reduced. There was a fear that it would be difficult to maintain As a result, the refrigerant generation efficiency of the refrigerant generation unit 20 may be lowered.

On the other hand, according to this embodiment, the refrigerant generating section 20 has the reinforcing member 90 attached to the moisture absorbing/releasing member 40 . The reinforcing member 90 has a side portion 91 arranged between the first opening 28 a and the second opening 25 a and the moisture absorbing/releasing member 40 . The side portion 91 is provided with a plurality of through holes 91d. Therefore, the moisture absorbing/releasing member 40 can be reinforced by the reinforcing member 90, and the warping and deformation of the moisture absorbing/releasing member 40 can be suppressed. In particular, the side portion 91 can suppress deformation of the portion of the moisture absorbing/releasing member 40 facing the first opening 28a and the second opening 25a. As a result, it is possible to suppress deterioration in the surface accuracy of the portions of the moisture absorbing/releasing member 40 that face the first opening 28a and the second opening 25a. In addition, the gap between the first opening 28a and the second opening 25a and the moisture absorbing/releasing member 40 can be filled with the side portion 91 . In addition, the material for forming the reinforcing member 90 can be arbitrarily selected regardless of the material for forming the moisture absorbing/desorbing member 40 . Therefore, by using a material that reduces the frictional force between the reinforcing member 90 and the circulation duct 25 and the circulation duct 28 as a material for the reinforcing member 90, the reinforcing member 90 and the first opening 28a and the second opening 28a The moisture absorbing/releasing member 40 and the reinforcing member 90 can be preferably rotated while being in contact with the portion 25a.

As described above, the occurrence of a gap between the moisture absorbing/releasing member 40 and the circulation duct 25 can be preferably suppressed. Therefore, the circulation path 27 can be easily sealed, and the humidity of the air AR2 in the circulation ducts 25 and 26 can be easily maintained. As a result, it is possible to suppress a decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 . Therefore, the amount of refrigerant W generated can be increased. In addition, the occurrence of a gap between the moisture absorbing/releasing member 40 and the circulation duct 28 can be suitably suppressed. Therefore, the air AR1 in the circulation duct 28 can be preferably sent to the moisture absorbing/releasing member 40 . As a result, it is possible to further suppress a decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 . Therefore, the amount of refrigerant W generated can be increased.

If the surface of the side portion 91 that contacts the circulation duct 28 and the circulation duct 25 has unevenness, even if the side portion 91 is brought into contact with the circulation duct 28 and the circulation duct 25, the unevenness will cause the side portion A gap is generated between 91 and circulation duct 28 and circulation duct 25 . In this case, by making the dimension of the unevenness in the rotation axis direction DR smaller than half of the dimension of the through hole 91d in the rotation axis direction DR, a gap is generated between the side portion 91 and the circulation duct 28 and the circulation duct 25. can be appropriately reduced. The same applies to the surface of the side portion 92 that contacts the circulation duct 29 and the circulation duct 26 .

Further, according to the present embodiment, at the same position in the radial direction about the rotation axis R, the circumferential dimension L1a of the through hole 91d is equal to the one end of the first opening 28a and the second opening in the circumferential direction. It is smaller than the circumferential dimension L3a of the first space S1a provided between the first space S1a and the one end of 25a. Therefore, one end of the first opening 28a, that is, the front (+θ side) end in the circumferential direction and one end of the second opening 25a, that is, the rear (−θ) end in the circumferential direction , one through-hole 91d does not face each other at the same time. In other words, the front end in the circumferential direction of the first opening 28a and the rear end in the circumferential direction of the second opening 25a are not connected via one through hole 91d.

As a result, as shown in FIG. 7, even if part of the air AR1 that has flowed into the through hole 91d from the first opening 28a flows toward the side where the second opening 25a is located, the edge of the through hole 91d is and does not flow through the through hole 91d to the second opening 25a and a position facing the second opening 25a in the rotation axis direction DR. Similarly, even if part of the air AR2 flowing into the through-hole 91d from the second opening 25a flows toward the first opening 28a, it is blocked by the edge of the through-hole 91d. It does not flow through the through hole 91d to the first opening 28a and a position facing the first opening 28a in the rotation axis direction DR. Therefore, it is possible to prevent the air AR2 flowing through the circulation ducts 25 and 26 from leaking to the outside and the air AR1 from flowing into the circulation ducts 25 and 26 from the outside. Therefore, the humidity of the air AR2 in the circulation ducts 25 and 26 can be more favorably maintained. As a result, it is possible to further suppress a decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 . In addition, since the air AR1 flowing through the circulation duct 28 can be prevented from leaking to the outside, the air AR1 inside the circulation duct 28 can be sent to the moisture absorbing/releasing member 40 more preferably. As a result, it is possible to further suppress the decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 .

Further, according to the present embodiment, at the same position in the radial direction, the circumferential dimension L1a of the through hole 91d is the same as the other end of the first opening 28a and the other end of the second opening 25a in the circumferential direction. is smaller than the circumferential dimension L4a of the second space S2a provided between. Therefore, the other end of the first opening 28a, that is, the rear (−θ side) end in the circumferential direction, and the other end of the second opening 25a, that is, the front (+θ side) end in the circumferential direction On the other hand, one through hole 91d does not face each other at the same time. In other words, the rear end in the circumferential direction of the first opening 28a and the front end in the circumferential direction of the second opening 25a are not connected via one through hole 91d. As a result, air flows in the circulation ducts 25 and 26 in the same manner as the air flows AR1 and AR2 at one end of the first opening 28a and one end of the second opening 25a that sandwich the first space S1a in the circumferential direction. It is possible to prevent the flowing air AR2 from leaking to the outside and the air AR1 from flowing into the circulation ducts 25 and 26 from the outside. Therefore, it is possible to further suppress the decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 . In addition, since leakage of the air AR1 flowing through the circulation duct 28 to the outside can be further suppressed, the air AR1 inside the circulation duct 28 can be sent to the moisture absorbing/releasing member 40 more preferably. As a result, it is possible to further suppress a decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 .

In addition, according to the present embodiment, the side portion 91 includes the inner portion 91a, the outer portion 91b located radially outside the inner portion 91a and surrounding the inner portion 91a, and the inner portion 91a extending in the radial direction. and a plurality of spoke portions 91c connected to the outer portion 91b and arranged side by side at intervals in the circumferential direction. The through holes 91d are provided between the spoke portions 91c adjacent in the circumferential direction. With such a configuration, it is easy to increase the total area of the plurality of through holes 91 d in the side portion 91 . This makes it easier for the air AR1 and AR2 to pass through the side portion 91 via the plurality of through holes 91 d , and makes it easier to send the air AR1 and AR2 to the moisture absorbing/releasing member 40 . Therefore, the refrigerant generation efficiency of the refrigerant generation unit 20 can be improved.

Further, according to this embodiment, the reinforcing member 90 has a pair of side portions 91 and 92 that sandwich the moisture absorbing/releasing member 40 in the rotation axis direction DR. Therefore, like the side portion 91 described above, the side portion 92 also prevents the air AR2 flowing through the circulation ducts 25 and 26 from leaking to the outside and prevents the air AR1 from flowing into the circulation ducts 25 and 26 from the outside. can be suppressed. Therefore, it is possible to more preferably suppress the decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 .

Further, according to this embodiment, the reinforcing member 90 has a cylindrical portion 93 surrounding the rotation axis R. As shown in FIG. The moisture absorbing/releasing member 40 is fitted inside the cylindrical portion 93 . Therefore, the reinforcing member 90 can more preferably reinforce the moisture absorbing/releasing member 40 . As a result, deterioration of the surface accuracy of the moisture absorbing/releasing member 40 can be more preferably suppressed. Therefore, the occurrence of gaps between the moisture absorbing/releasing member 40 and the circulation ducts 25 and 26 can be more preferably suppressed. Therefore, the circulation path 27 can be more easily sealed, and the humidity of the air AR2 in the circulation ducts 25 and 26 can be more favorably maintained. As a result, it is possible to further suppress a decrease in the refrigerant generation efficiency of the refrigerant generation unit 20 . Further, by providing the tubular portion 93 , the reinforcing member 90 can be easily attached to the moisture absorbing/releasing member 40 .

Further, according to the present embodiment, the first blower 60 is a cooling blower that sends air AR1 to the optical modulation units 4R, 4G, and 4B to be cooled. Therefore, the coolant W transmitted to the optical modulation units 4R, 4G, and 4B is easily vaporized by the air AR1, and the optical modulation units 4R, 4G, and 4B can be further cooled. In addition, since it is not necessary to separately provide a cooling blower for cooling the object to be cooled in addition to the first blower 60, it is possible to suppress an increase in the number of parts of the projector 1 and an increase in noise.

Further, as described above, in the present embodiment, the first blower device 60, which is an intake fan that draws outside air into the interior of the projector 1, is used to promote vaporization of the coolant W sent to the object to be cooled. Therefore, even if the output of the first air blower 60 is reduced, it is possible to obtain the same cooling performance as when the cooling device 10 is not provided. Therefore, the output of the first blower device 60, which is an intake fan, can be reduced to reduce the noise generated from the first blower device 60, and the quietness of the projector 1 can be further improved.

Further, according to the present embodiment, the heating unit 22 includes the heating main unit 22a that heats the air before passing through the portion of the moisture absorbing/releasing member 40 located in the second region F2, the second air blower 23, have Therefore, the heating unit 22 can heat the second portion of the moisture absorbing/releasing member 40 located in the second area F2 by sending the air AR2 to the moisture absorbing/releasing member 40 with the second air blower 23 . Thereby, even if the heating body portion 22 a is arranged at a position away from the moisture absorbing/releasing member 40 , the moisture absorbing/releasing member 40 can be heated by the heating portion 22 . Therefore, the degree of freedom of configuration of the heating unit 22 can be improved.

Further, according to the present embodiment, the refrigerant generator 20 has the motor 24 that rotates the moisture absorbing/releasing member 40 . Therefore, the moisture absorbing/releasing member 40 can be stably rotated at a constant speed. As a result, the first portion of the moisture absorbing/releasing member 40 located in the first region F1 can be made to preferably absorb water vapor from the air AR1, and the second portion of the moisture absorbing/releasing member 40 located in the second region F2 can be made to absorb moisture. Moisture can be preferably released from the part into the air AR2. Therefore, the coolant W can be efficiently generated.

Further, according to the present embodiment, the cooling medium holding portions 71 that hold the cooling medium W are provided in the optical modulation units 4R, 4G, and 4B to be cooled. Therefore, the refrigerant W transmitted to the optical modulation units 4R, 4G, and 4B can be held in the optical modulation units 4R, 4G, and 4B by the refrigerant holding section 71 until the refrigerant W is vaporized. As a result, the generated coolant W can be easily used without waste, and the cooling performance of the cooling device 10 can be further improved.

Further, according to the present embodiment, the coolant holding portion 71 is attached to the surfaces of the optical modulation units 4R, 4G, and 4B to be cooled, and is made of a porous member. At least part of the coolant holding portion 71 is exposed when viewed from the side of the coolant holding portion 71 in the stacking direction. Therefore, the coolant W can be easily vaporized from the exposed portion of the coolant holding portion 71, and the cooling performance of the cooling device 10 can be further improved. In addition, since the coolant holding portion 71 is made of a porous member, the coolant W can easily spread uniformly over the surface of the object to be cooled on which the coolant holding portion 71 is provided by capillarity, and the object to be cooled can be cooled more easily.

Further, for example, when the refrigerant holding portion 71 is fixed to the holding frame 80 with an adhesive, the adhesive may be absorbed by the refrigerant holding portion 71 and clog the holes of the refrigerant holding portion 71 made of a porous member. be. Therefore, the refrigerant W is less likely to be absorbed by the refrigerant holding portion 71 , and the refrigerant W may be less likely to be held by the refrigerant holding portion 71 .

In contrast, according to the present embodiment, the fixing member 72 is provided to fix the refrigerant holding portion 71 by sandwiching it with the holding frame 80 . Therefore, the coolant holding portion 71 can be fixed to the holding frame 80 without using an adhesive. As a result, it is possible to prevent the coolant W from becoming difficult to be retained by the coolant retaining portion 71 . Moreover, in this embodiment, the fixing member 72 is made of metal. Therefore, the fixing member 72 has relatively high thermal conductivity and is easily cooled. Therefore, the temperature of the fixed member 72 is likely to decrease due to the vaporization of the air AR1 and the coolant W from the first blower device 60, and the object to be cooled in contact with the fixed member 72 is more easily cooled.

Further, according to this embodiment, the coolant holding portion 71 is provided on the surface of the holding frame 80 on the light incident side of the light modulation device 4GP. Therefore, it is possible to suppress the water vapor of the coolant W vaporized from the coolant holding portion 71 from affecting the light emitted from the light modulator 4GP to the photosynthetic optical system 5 . Accordingly, it is possible to suppress the occurrence of noise in the image projected from the projector 1 .

Further, according to the present embodiment, the coolant holding portion 71 is provided in each of the plurality of optical modulation units 4R, 4G, and 4B, and the connecting portions 73a and 73b that connect the plurality of coolant holding portions 71 to each other are provided. It is Therefore, by connecting the refrigerant transmission part 50 to one refrigerant holding part 71 , the refrigerant W can be transmitted to the other refrigerant holding parts 71 . As a result, it is possible to simplify the routing of the refrigerant transmission section 50 inside the projector 1 .

Further, according to the present embodiment, the connecting portions 73a and 73b are provided with the covering portions 74 that cover the connecting portions 73a and 73b, respectively. Therefore, it is possible to suppress the vaporization of the coolant W moving along the connecting portions 73a and 73b at the connecting portions 73a and 73b. As a result, it is possible to prevent the refrigerant W from evaporating without contributing to the cooling of the optical modulation units 4R, 4G, and 4B, which are objects to be cooled, and to prevent the generated refrigerant W from being wasted.

In addition, in the present embodiment, the connecting portion 54 may be covered, as with the connecting portions 73a and 73b. According to this configuration, it is possible to suppress the vaporization of the coolant W while it is being transmitted to the object to be cooled. Therefore, the coolant W can be efficiently transmitted to the object to be cooled, and waste of the generated coolant W can be further suppressed. The connection portion 54 and the connection portions 73a and 73b may be covered with a tube or the like, for example. Further, the connection portion 54 and the connection portions 73a and 73b may be subjected to a coating treatment for suppressing vaporization.

<Second embodiment>
This embodiment differs from the first embodiment in the configuration of the second openings 125a and 126a of the circulation ducts 125 and 126. FIG. FIG. 13 is a diagram showing the first openings 28a, 29a and the second openings 125a, 126a of this embodiment. It should be noted that the same configurations as those described above may be omitted by appropriately assigning the same reference numerals.

As shown in FIG. 13 , the second opening 125a in the refrigerant generating section 120 of the present embodiment is longer toward the front side (+θ side) in the circumferential direction than the second opening 25a of the first embodiment. As a result, the circumferential dimension L4c of the second space S2c between the first opening 28a and the second opening 125a in the circumferential direction is larger than the circumferential dimension L4a of the second space S2a in the first embodiment. small. In the present embodiment, the circumferential dimension L1a of the through hole 91d is greater than the circumferential dimension L4c of the second space S2c at the same radial position. At the same radial position, the circumferential dimension L4c of the second space S2c is smaller than the circumferential dimension L3a of the first space S1a.

Further, in the present embodiment, the second opening 126a is longer toward the front side (+.theta. side) in the circumferential direction than the second opening 26a of the first embodiment. As a result, the circumferential dimension L4d of the second space S2d between the first opening 29a and the second opening 126a is larger than the circumferential dimension L4b of the second space S2b in the first embodiment. small. In the present embodiment, the circumferential dimension L2a of the through hole 92d is greater than the circumferential dimension L4d of the second space S2d at the same radial position. At the same radial position, the circumferential dimension L4d of the second space S2d is smaller than the circumferential dimension L3b of the first space S1b. Other configurations of this embodiment can be similar to other configurations of the above-described embodiments.

According to the present embodiment, the circumferential dimension L1a of the through hole 91d is greater than the circumferential dimension L4c of the second space S2c at the same radial position. Therefore, the second space S2c can be narrowed in the circumferential direction, and at least one of the first opening 28a and the second opening 125a can be widened in the circumferential direction. Therefore, at least one of the amount of air AR1 sent to the moisture absorbing/releasing member 40 from the first opening 28a and the amount of air AR2 sent to the moisture absorbing/releasing member 40 from the second opening 125a can be increased. This makes it easier to perform at least one of moisture absorption to the moisture absorbing/releasing member 40 and moisture releasing from the moisture absorbing/releasing member 40 . In this embodiment, the second opening 125a is larger in the circumferential direction than in the first embodiment. Therefore, the amount of air AR2 sent to the moisture absorbing/releasing member 40 from the second opening 125a can be increased. This makes it easier to release moisture from the moisture absorbing/releasing member 40 to the air AR2.

Further, according to the present embodiment, as in the first embodiment, the direction in which the moisture absorbing/releasing member 40 rotates is the direction from the first opening 28a through the first space S1a toward the second opening 125a. be. Here, in the present embodiment, the first space S1a is circumferentially larger than the second space S2c. Therefore, the time required for the portion of the moisture absorbing/desorbing member 40 facing the first opening 28a to rotate forward in the circumferential direction (+θ side) and move to a position facing the second opening 125a is It takes longer than the time required for the part of the moisture releasing member 40 facing the second opening 125a to rotate forward in the circumferential direction (+θ side) and move to the position facing the first opening 28a. As a result, the temperature of the portion of the moisture absorbing/releasing member 40 that has been relatively low due to the air AR1 from the first opening 28a is increased while the portion is moving facing the first space S1a. can be made Therefore, it is possible to prevent a part of the moisture absorbing/releasing member 40 from moving to a position facing the second opening 125a while the temperature is relatively low, and to prevent the temperature of the air AR2 in the circulation path 27 from decreasing. Therefore, the refrigerant generation efficiency of the refrigerant generation unit 120 can be improved.

In this embodiment, the direction in which the moisture absorbing/releasing member 40 rotates may be reversed. That is, the direction in which the moisture absorbing/releasing member 40 rotates may be the direction from the first opening 28a through the second space S2c toward the second opening 125a. In this case, the time required for the portion of the moisture absorbing/releasing member 40 facing the second opening 125a to rotate and move to the position facing the first opening 28a is This is longer than the time required for the portion facing the first opening 28a to rotate and move to the position facing the second opening 125a. As a result, the temperature of the portion of the moisture absorbing/releasing member 40 that has been relatively high due to the air AR2 from the second opening 125a is lowered while the portion is moving facing the first space S1a. can be made Therefore, it is possible to prevent a portion of the moisture absorbing/releasing member 40 from moving to a position facing the first opening 28a while still at a relatively high temperature. Therefore, it is possible to make the moisture absorption/desorption member 40 more likely to absorb moisture from the air AR1 sent from the first opening 28a. Thereby, the refrigerant generation efficiency of the refrigerant generation unit 120 can be improved.

<Third Embodiment>
This embodiment differs from the first embodiment in the configuration of the through holes 291d. FIG. 14 is a view of the reinforcing member 290 of this embodiment viewed from one side (+DR side) in the rotation axis direction DR. It should be noted that the same configurations as those described above may be omitted by appropriately assigning the same reference numerals.

As shown in FIG. 14 , in the reinforcing member 290 of the refrigerant generating section 220 of the present embodiment, the side portion 291 positioned between the circulation duct 28 and the circulation duct 25 and the moisture absorbing/releasing member 40 in the rotation axis direction DR is Unlike the side portion 91 of the first embodiment, it does not have an inner portion 91a, an outer portion 91b and a plurality of spoke portions 91c. The side portion 291 of this embodiment has an annular plate shape provided with a plurality of through holes 291d. 291 d of through-holes are circular holes in this embodiment. The plurality of through-holes 291d are distributed in the circumferential and radial directions. That is, in the present embodiment, the plurality of through holes 291d include a plurality of through holes 291d with different positions in the radial direction and a plurality of through holes 291d with different positions in the circumferential direction. For example, in the present embodiment, the plurality of through-holes 291d includes a first through-hole 291e, a second through-hole 291f whose radial position is different from that of the first through-hole 291e, and a circumferential position which is different from that of the first through-hole 291e. and a different third through hole 291g. The second through-hole 291f has the same circumferential position as the first through-hole 291e, and the third through-hole 291g has the same radial position as the first through-hole 291e.

At the same radial position, the circumferential dimension L1b of the through hole 291d is smaller than the circumferential dimension L3a of the first space S1a and the circumferential dimension L4a of the second space S2a. In this embodiment, the through holes 291d have the same size. Although not shown, a side portion located between the distribution duct 29/circulation duct 26 and the moisture absorbing/releasing member 40 in the rotational axis direction DR also has the same configuration as the side portion 291 . Other configurations of this embodiment can be similar to other configurations of the above-described embodiments.

Also in the present embodiment, the reinforcement member 290 having the side portion 291 can suppress a decrease in the refrigerant generation efficiency of the refrigerant generation section 220 in the same manner as in the first embodiment.

Further, according to the present embodiment, the plurality of through holes 291d can be easily formed by, for example, punching a part of the plate-shaped member by press working. Therefore, the side portion 291 provided with a plurality of through holes 291d can be easily made. Therefore, the manufacturing cost of the reinforcing member 290 can be reduced.

<Fourth Embodiment>
This embodiment is different from the third embodiment in that the plurality of through holes 391d includes a plurality of through holes 391d having different circumferential dimensions. FIG. 15 is a view of the reinforcing member 390 of this embodiment viewed from one side (+DR side) in the rotation axis direction DR. It should be noted that the same configurations as those described above may be omitted by appropriately assigning the same reference numerals.

As shown in FIG. 15, in the coolant generation unit 320 of the present embodiment, the plurality of through holes 391d provided in the side portion 391 include three types of through holes 391e, 391f, and 391g with different radial positions. A plurality of through holes 391e, 391f, and 391g are provided along the circumferential direction. The through-hole 391e is positioned radially inside the through-holes 391f and 391g. For example, the through-hole 391e includes a first through-hole 391h and a third through-hole 391k whose circumferential position is different from that of the first through-hole 391h and whose radial position is the same as that of the first through-hole 391h. The through hole 391e is a circular hole like the through hole 291d of the third embodiment. A circumferential dimension L1e of the through-hole 391e is a circumferential dimension L3e of a portion of the first space S1a located at the same radial position as the through-hole 391e, and a circumferential dimension L3e of the second space S2a located at the same radial position as the through-hole 391e. It is smaller than the circumferential dimension L4e of the portion located at the position.

The through-hole 391f is located radially outside the through-hole 391e and radially inside the through-hole 391g. For example, the through-hole 391f includes a second through-hole 391i whose position in the radial direction is different from that of the first through-hole 391h and which is located radially outside the first through-hole 391h. The through hole 391f is an elliptical hole whose circumferential dimension is larger than its radial dimension. A circumferential dimension L1f of the through hole 391f is larger than a circumferential dimension L1e of the through hole 391e. That is, the circumferential dimension of the second through hole 391i is larger than the circumferential dimension of the first through hole 391h. A circumferential dimension L1f of the through hole 391f is a circumferential dimension L3f of a portion of the first space S1a located at the same radial position as the through hole 391f, and a circumferential dimension L3f of the portion of the second space S2a located at the same radial position as the through hole 391f. It is smaller than the circumferential dimension L4f of the portion located at the position.

The through hole 391g is positioned radially outside the through hole 391f. For example, the through-hole 391g includes a second through-hole 391j whose position in the radial direction is different from that of the first through-hole 391h and which is located radially outside the first through-hole 391h. The through hole 391g is an elliptical hole whose circumferential dimension is larger than its radial dimension. A circumferential dimension L1g of the through hole 391g is larger than a circumferential dimension L1f of the through hole 391f. That is, the circumferential dimension of the second through hole 391j is larger than the circumferential dimension of the first through hole 391h. A circumferential dimension L1g of the through hole 391g is a circumferential dimension L3g of a portion of the first space S1a located at the same radial position as the through hole 391g, and a circumferential dimension L3g of the portion of the second space S2a located at the same radial position as the through hole 391g. It is smaller than the circumferential dimension L4g of the portion located at the position.

As described above, in the present embodiment, the circumferential dimension of the through holes 391d is larger for the through holes 391d positioned radially outward. Although illustration is omitted, a side portion located between the distribution duct 29/circulation duct 26 and the moisture absorbing/releasing member 40 in the rotation axis direction DR also has the same configuration as the side portion 391 . Other configurations of this embodiment can be similar to other configurations of the above-described embodiments.

Also in the present embodiment, the reinforcement member 390 having the side portion 391 can suppress a decrease in the refrigerant generation efficiency of the refrigerant generation section 320 in the same manner as in the first embodiment.

Further, according to the present embodiment, the circumferential dimension of the first space S1a increases toward the radially outer side, and the circumferential dimension of the through hole 391d is the radially outer through hole 391d. as big as Therefore, one through-hole 391d is arranged to simultaneously face one end of the first opening 28a and one end of the second opening 25a, which are arranged to sandwich the first space S1a in the circumferential direction. The total area of the plurality of through holes 391d can be increased while suppressing it. This makes it easier for the air AR1 and AR2 to pass through the side portion 391 via the plurality of through holes 391d, and makes it easier to send the air AR1 and AR2 to the moisture absorbing/releasing member 40. FIG. Therefore, the refrigerant generation efficiency of the refrigerant generation unit 320 can be further improved.

In addition, the embodiments of the present invention are not limited to the above-described embodiments, and the following configurations can also be adopted. The reinforcing member can be of any configuration, provided it has at least one side. For example, in the reinforcing member 90 of the first embodiment described above, one of the pair of side portions 91 and 92 may not be provided. The reinforcing member may not have a tubular portion. The sides of the reinforcing member may not be in contact with the first opening of the circulation duct and the second opening of the circulation duct. A material constituting the reinforcing member is not particularly limited.

The number of through-holes provided in the side portion of the reinforcing member is not particularly limited as long as it is two or more. The shape of the through-hole provided in the side portion is not particularly limited, and may be polygonal. The plurality of through-holes provided in the side portion may include a plurality of through-holes having different shapes. The circumferential dimension of the through hole provided in the side portion is not particularly limited. At the same position in the radial direction about the rotation axis of the moisture absorbing/releasing member, the circumferential dimension of the through hole provided in the side portion may be larger than the circumferential dimension of the first space. It may be the same as the circumferential dimension of the space.

The refrigerant generation section may have an external blower that blows air from outside the heat exchange section to the heat exchange section. As the external blower, for example, a configuration such as an external blower 160 indicated by a chain double-dashed line in FIG. 8 can be adopted. The external blower 160 is located on the other side (−DT side) of the housing 31 in the thickness direction. The external blower 160 is, for example, an axial fan. The external blower 160 sends air AR4 from the outside of the housing 31 to the housing 31 . More specifically, the external blower 160 sends air AR4 from the other side (-DT side) of the housing 31 to one side (+DT side) in the thickness direction DT. The air AR2 in the internal space 35 can be cooled from the outside of the housing 31 by sending the air AR4 with the external blower 160 . As a result, the water vapor contained in the air AR2 can be more easily condensed, and the refrigerant generation efficiency can be further improved. Note that the external blower 160 may be a centrifugal fan.

The heating unit is not limited to the embodiment described above. The heating unit may be configured to heat the moisture absorbing/releasing member by coming into contact with the moisture absorbing/releasing member. In this case, the heating unit does not have to heat the air before passing through the moisture absorbing/releasing member.

In the above-described embodiment, the cooling blower that sends air to the object to be cooled is the first blower provided in the coolant generation unit, but the present invention is not limited to this. The cooling air blower may be provided separately in addition to the air blower provided in the refrigerant generating section. The coolant is not particularly limited as long as it can cool the object to be cooled, and may be other than water.

Further, although the object to be cooled is the optical modulation unit in the above-described embodiment, it is not limited to this. The objects to be cooled are the light modulation device, the light modulation unit, the light source, the wavelength conversion element that converts the wavelength of the light emitted from the light source, the diffusion element that diffuses the light emitted from the light source, and the light emitted from the light source. At least one of a polarization conversion element that converts the polarization direction of the light and a power supply device may be included. According to this configuration, each part of the projector can be cooled in the same manner as described above. A plurality of objects to be cooled may be provided.

Further, in the above embodiment, an example in which the present invention is applied to a transmissive projector has been described, but the present invention can also be applied to a reflective projector. Here, the term “transmissive type” means that the light modulating device including the liquid crystal panel or the like transmits light. "Reflective" means that the light modulator is of a type that reflects light. Note that the light modulation device is not limited to a liquid crystal panel or the like, and may be, for example, a light modulation device using a micromirror.

Further, in the above embodiments, an example of a projector using three light modulation devices was given, but the present invention can be applied to a projector using only one light modulation device and a projector using four or more light modulation devices. is also applicable.

Further, each configuration described in this specification can be appropriately combined within a mutually consistent range.

DESCRIPTION OF SYMBOLS 1... Projector 2... Light source 4B, 4G, 4R... Optical modulation unit (object to be cooled) 4BP, 4GP, 4RP... Optical modulation device (object to be cooled) 10... Cooling device 20, 120, 220, 320... Coolant Generation part 22 Heating part 23 Second blower 25, 26, 125, 126 Circulation duct 25a, 26a, 125a, 126a Second opening 28, 29 Distribution duct 28a, 29a First opening 30 Heat exchanging part 40 Moisture absorbing/releasing member 91d, 92d, 291d, 391d, 391e, 391f, 391g Through hole 50 Refrigerant transmission part 60 First blower 90, 290, 390... Reinforcement member 91, 92, 291, 391... Side part 91a, 92a... Inner part 91b, 92b... Outer part 91c, 92c... Spoke part 93... Cylindrical part 291e, 391h... Third 1 through hole 291f, 391i, 391j second through hole 291g, 391k third through hole F1 first area F2 second area R axis of rotation S1a, S1b first space S2a , S2b, S2c, S2d... second space, W... refrigerant

Claims (12)

A projector comprising an object to be cooled,
a light modulator that modulates light emitted from a light source;
a cooling device that cools the object to be cooled by changing the refrigerant to gas;
with
The cooling device includes: a coolant generation unit that generates the coolant; a coolant transmission unit that transmits the generated coolant toward the object to be cooled;
has
The refrigerant generation unit is
a moisture absorbing/releasing member that rotates around a rotation axis;
a first air blower for sending air to a first portion of the moisture absorbing/releasing member located in the first region;
a heat exchange section connected to the refrigerant transmission section;
a heating unit that heats a second portion of the moisture absorbing/releasing member located in a second area different from the first area;
a second air blower for sending air around the second portion to the inside of the heat exchange section;
a circulation duct through which air sent by the first blower passes;
a circulation duct through which the air circulated between the second portion and the heat exchange section by the second blower passes;
a reinforcing member attached to the moisture absorbing/releasing member;
has
The circulation duct has a first opening that opens toward the first portion,
The circulation duct has a second opening that opens toward the second portion,
The first opening and the second opening are spaced apart in a circumferential direction around the rotation axis,
The reinforcing member has a side portion disposed between the first and second openings and the moisture absorbing/releasing member,
The projector, wherein the side portion is provided with a plurality of through holes. A first space is provided between one end of the first opening and one end of the second opening in the circumferential direction,
A second space is provided between the other end of the first opening and the other end of the second opening in the circumferential direction,
2. The projector according to claim 1, wherein the circumferential dimension of the through-hole is smaller than the circumferential dimension of the first space at the same radial position about the rotation axis. 3. The projector according to claim 2, wherein the circumferential dimension of the through-hole is smaller than the circumferential dimension of the second space at the same position in the radial direction. 3. The projector according to claim 2, wherein the circumferential dimension of the through-hole is greater than the circumferential dimension of the second space at the same position in the radial direction. 5. The projector according to claim 4, wherein the direction in which the moisture absorbing/releasing member rotates is the direction from the first opening through the first space toward the second opening. 5. The projector according to claim 4, wherein the direction in which the moisture absorbing/releasing member rotates is the direction from the first opening through the second space toward the second opening. The side portion
inner part;
an outer portion located outside the inner portion in the radial direction and surrounding the inner portion;
a plurality of spoke portions extending in the radial direction, connecting the inner portion and the outer portion, and arranged side by side at intervals in the circumferential direction;
has
7. The projector according to any one of claims 2 to 6, wherein the through-holes are provided between the spoke portions adjacent to each other in the circumferential direction. The plurality of through holes are
a first through hole;
a second through hole at a position in the radial direction different from that of the first through hole;
a third through hole different in position in the circumferential direction from the first through hole;
7. A projector according to any one of claims 2 to 6, comprising: The dimension of the first space in the circumferential direction increases toward the outer side in the radial direction,
the second through hole is located outside the first through hole in the radial direction,
9. The projector according to claim 8, wherein the circumferential dimension of the second through hole is larger than the circumferential dimension of the first through hole. 10. The projector according to any one of claims 1 to 9, wherein the reinforcing member has a pair of side portions sandwiching the moisture absorbing/releasing member in the axial direction of the rotating shaft. The reinforcing member has a cylindrical portion surrounding the rotating shaft,
The projector according to any one of claims 1 to 10, wherein the moisture absorbing/releasing member is fitted inside the cylindrical portion. The projector according to any one of claims 1 to 11, wherein the object to be cooled includes the light modulation device.

Images