JP2023144376A - projector - Google Patents

Abstract

To provide a projector that has achieved miniaturization and an improvement in cooling efficiency.SOLUTION: A projector of the present invention comprises: a light source that emits light; an optical modulator that modules the light emitted from the light source; a projection optical device that projects the light modulated by the optical modulator; a sealed enclosure that has a first opening and accommodates the optical modulator in a sealed state; a fan that is accommodated in the sealed enclosure, and that has a housing, an intake port to take in air inside the sealed enclosure to the housing, an exhaust port to exhaust the air from the housing, and a second opening through which air circulates; and a heat absorption unit that is arranged outside an inner face of the sealed enclosure. The first opening of the sealed enclosure is sealed by the heat absorption unit, and the heat absorption unit and the second opening of the fan are arranged to be partially overlap each other in plan view.SELECTED DRAWING: Figure 2

Description

The present invention relates to a projector.

BACKGROUND ART Conventionally, there is a projector equipped with a cooling mechanism that cools air blown onto a light modulation device housed in a housing using a heat exchanger, and then blows the air back onto the light modulation device (see, for example, Patent Document 1 below).

Japanese Patent Application Publication No. 2018-205462

In the projector described above, since the heat exchanger is disposed on the flow path of air circulating within the housing, there is a problem in that the housing becomes larger by the volume of the heat exchanger disposed within the housing. Therefore, if the housing is miniaturized without arranging a heat exchanger inside the housing, the cooling efficiency of the heat source inside the housing will decrease. Therefore, it is desired to provide a new technology that can efficiently cool the heat source while downsizing the device configuration.

In order to solve the above problems, one aspect of the present invention includes a light source that emits light, a light modulation device that modulates the light emitted from the light source, and a light modulation device that modulates the light modulated by the light modulation device. a projection optical device for projecting; a housing having a first opening and housing the light modulation device in a sealed state; a housing accommodated in the housing; and an intake port for taking air inside the housing into the housing. a fan having a discharge port for discharging the air from the housing, and a second opening through which the air flows; and a heat absorbing section disposed outside an inner surface of the housing, The first opening of the body is sealed by the heat absorption part, and the heat absorption part and the second opening of the fan are arranged so as to at least partially overlap in plan view. Ru.

FIG. 1 is a diagram showing a schematic configuration of a projector according to a first embodiment. FIG. 3 is a side sectional view showing the peripheral configuration of the sealed casing. FIG. 2 is a perspective view showing a schematic configuration of a fan. FIG. 3 is a plan view showing the positional relationship between a fan and a heat absorbing section in the first embodiment. FIG. 7 is a sectional view of a main part of a projector according to a second embodiment. It is a top view which shows the positional relationship of the fan and the heat absorption part in 2nd embodiment. FIG. 7 is a cross-sectional view of a main part of a projector according to a third embodiment.

Embodiments of the present invention will be described in detail below with reference to the drawings.
Note that the drawings used in the following explanations may show characteristic parts enlarged for convenience in order to make the characteristics easier to understand, and the dimensional ratio of each component may not be the same as the actual one. do not have.

(First embodiment)
First, an example of a projector according to this embodiment will be described.
FIG. 1 is a diagram showing a schematic configuration of a projector according to this embodiment.
As shown in FIG. 1, the projector 1 of this embodiment is a projection type image display device that displays a color image on a screen SCR. The projector 1 includes a light source 2, a color separation optical system 3, a light modulation device 4R, a light modulation device 4G, a light modulation device 4B, a combining optical system 5, a projection optical device 6, a sealed housing 11, and a fan. 12 and an exterior casing 13.

The light source 2 supplies white illumination light WL to the color separation optical system 3. The light source 2 of this embodiment is, for example, a white illumination light WL that includes yellow fluorescence generated by wavelength-converting excitation light emitted from a light source module including a semiconductor laser using a phosphor and blue light transmitted through the phosphor. generate. Note that the light source 2 is not limited to a configuration using laser light, and an LED or a discharge type lamp can also be used.

The color separation optical system 3 separates the illumination light WL 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 total reflection mirror 8a, a second total reflection mirror 8b, a third total reflection mirror 8c, and a first total reflection mirror 8a. It generally includes a relay lens 9a and a second relay lens 9b.

The first dichroic mirror 7a separates the illumination light WL from the light source 2 into red light LR and other lights (green light LG and blue light LB). The first dichroic mirror 7a transmits the separated red light LR and reflects other lights (green light LG and blue light LB). On the other hand, the second dichroic mirror 7b reflects the green light LG and transmits the blue light LB, thereby separating the other light into the green light LG and the blue light LB.

The first total reflection mirror 8a is disposed 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 modulation device 4R. On the other hand, the second total reflection mirror 8b and the third total reflection 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 modulation device 4B. The green light LG is reflected from the second dichroic mirror 7b toward the light modulation device 4G.

The first relay lens 9a and the second relay lens 9b are arranged after the second dichroic mirror 7b in the optical path of the blue light LB.

The light modulation device 4R modulates the red light LR according to image information to form image light corresponding to the red light LR. The light modulation device 4G modulates the green light LG according to image information to form image light corresponding to the green light LG. The light modulation device 4B modulates the blue light LB according to image information to form image light corresponding to the blue light LB.

For example, a transmissive liquid crystal panel is used for the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B. Further, polarizing plates (not shown) are arranged on each of the incident side and the exit side of the liquid crystal panel.

Further, a field lens 10R, a field lens 10G, and a field lens 10B are arranged on the incident side of the light modulator 4R, the light modulator 4G, and the light modulator 4B, respectively. The field lens 10R, field lens 10G, and field lens 10B collimate the red light LR, green light LG, and blue light LB that enter the light modulation device 4R, light modulation device 4G, and light modulation device 4B, respectively.

Image light from the light modulation device 4R, light modulation device 4G, and light modulation device 4B is incident on the combining optical system 5. The combining optical system 5 combines image lights each corresponding to red light LR, green light LG, and blue light LB, and emits the combined image light toward the projection optical device 6. The combining optical system 5 uses, for example, a cross dichroic prism.

The sealed casing 11 houses the light modulating devices 4R, 4G, and 4B, the color separation optical system 3, the combining optical system 5, and the fan 12 in a sealed state.

The light source 2 is connected to a light source connection portion 11a provided in the sealed housing 11. The light source connecting portion 11a is configured of, for example, a window portion having translucency. Based on such a configuration, the light source 2 causes the illumination light WL to enter each of the light modulation devices 4R, 4G, and 4B via the light source connection portion 11a of the sealed housing 11.

The exterior housing 13 houses the light source 2 and the sealed housing 11, and constitutes the exterior of the projector 1.

The projection optical device 6 is connected to a projection connection section 11b provided in the sealed housing 11. The projection connection portion 11b is configured of, for example, a window portion having translucency. Furthermore, the projection connection section 11b may include a lens shift mechanism that shifts the optical axis of the projection optical device 6.

The projection optical device 6 is provided with a portion protruding from the exterior housing 13. The projection optical device 6 includes a group of projection lenses, and enlarges and projects the image light combined by the combining optical system 5 toward the screen SCR. As a result, an enlarged color image is displayed on the screen SCR.

FIG. 2 is a side sectional view showing the peripheral structure of the sealed casing.
As shown in FIG. 2, the fan 12 is disposed within the sealed casing 11 and discharges air A for cooling at least the optical modulators 4R, 4G, and 4B. Air A heated by cooling the optical modulators 4R, 4G, and 4B circulates within the sealed casing 11 and is sucked into the fan 12 again. Note that the air A discharged from the fan 12 into the sealed housing 11 may be used to cool optical members other than the optical modulators 4R, 4G, and 4B.

The fan 12 supplies heated air A to the heat absorption section 14 by cooling the light modulation devices 4R, 4G, and 4B. The heat absorption section 14 cools the air A supplied from the fan 12 by absorbing heat therefrom.

The closed housing 11 has a bottom plate 111 in which a first opening 110 is formed.
The heat absorbing portion 14 is inserted into the first opening 110 of the sealed housing 11 to seal the first opening 110.
The heat absorbing portion 14 is arranged outside the inner surface 111a of the bottom plate 111 of the sealed casing 11 (hereinafter referred to as "inner surface 111a of the sealed casing 11").
Here, the expression "outside the inner surface 111a" includes a state in which the surface 14a of the heat absorbing portion 14 is located outside the inner surface 111a of the bottom plate 111 in the sealed casing 11, and a state in which the surface 14a and the inner surface 111a are flush with each other. In other words, the surface 14a of the heat absorbing portion 14 does not protrude further into the sealed casing 11 than the inner surface 111a.
Therefore, the sealed casing 11 does not need to provide a housing space for the heat absorbing part 14, so the size of the sealed casing 11 can be suppressed compared to the case where the heat absorbing part 14 protrudes inside the sealed casing 11. I can do it.

The outer shape of the heat absorbing portion 14 has a shape corresponding to the first opening 110. The projector 1 of this embodiment further includes an elastic member 16 provided between the heat absorbing section 14 and the first opening 110. The elastic member 16 is made of, for example, rubber or a porous material.
For example, even if the sealed casing 11 and the heat absorption section 14 (vapor chamber 140) have different coefficients of thermal expansion, the elastic member 16 can prevent the difference between the heat absorption section 14 and the first opening 110 caused by the difference in thermal expansion coefficients. By filling the gap, the airtightness of the inside of the sealed casing 11 can be maintained. However, the outer shape of the heat absorbing portion 14 does not necessarily have to correspond to the first opening 110 as long as the internal space of the sealed casing 11 can be sealed.

The heat absorption section 14 includes a vapor chamber (heat transport member) 140 and a heat radiation member 149. The vapor chamber 140 is cooled by transporting heat from the air A discharged from the housing 120 by the fan 12. The heat dissipation member 149 is provided in the vapor chamber 140 and enhances the heat dissipation performance of the vapor chamber 140 by discharging the heat of the vapor chamber 140.

The vapor chamber 140 includes a heat receiving plate 141 that supports the fan 12 and a heat sink 142 provided on the opposite side of the heat receiving plate 141 from the fan 12. The vapor chamber 140 contains a heat receiving part 141a that receives heat from the air taken in by the fan 12, a heat radiating part 142a that radiates the heat received by the heat receiving part 141a to a heat radiating member 149, and a working fluid (refrigerant) L in a sealed state. and a storage room SP.

The heat receiving portion 141a is provided on the surface of the heat receiving plate 141 on the opposite side to the storage chamber SP. The heat receiving part 141a vaporizes the liquid working fluid L by the heat of the air A taken in by the fan 12.

The heat dissipation part 142a is provided on the surface of the heat dissipation plate 142 on the opposite side to the accommodation chamber SP. The heat radiating section 142a radiates heat from the gaseous working fluid L flowing in the storage chamber SP to condense it and return it to the liquid working fluid L. A heat radiating member 149 is provided on the outer surface of the heat radiating plate 142 at a portion corresponding to the heat radiating portion 142a. The heat radiation member 149 is a heat sink including a plurality of radiation fins 149a.

The projector 1 of this embodiment includes a heat radiation fan 15 that supplies cooling air to the heat absorption section 14. The heat dissipation fan 15 is arranged outside the sealed casing 11 and inside the exterior casing 13. The heat dissipation fan 15 takes in outside air from an air inlet (not shown) provided in the exterior housing 13 and supplies it as cooling air to the plurality of heat dissipation fins 149a in the heat absorption section 14 (heat dissipation member 149). In the projector 1 of this embodiment, the cooling performance is further improved by increasing the heat dissipation performance of the heat absorption section 14 using the heat dissipation fan 15.

FIG. 3 is a perspective view showing a schematic configuration of the fan 12. As shown in FIG.
As shown in FIG. 3, the fan 12 includes a housing 120, an intake port 121, a discharge port 122, a second opening 123, and the housing 120.
The fan 12 of this embodiment is comprised of, for example, a sirocco fan. The housing 120 is a member constituting the fan body, holds an impeller and a motor, which are the constituent members of the fan 12, and functions as an air guiding member for guiding the air A taken in.
The housing 120 includes a first wall 120a, a second wall 120b disposed opposite to the first wall 120a, and a side wall 120c connecting the first wall 120a and the second wall 120b.

The intake port 121 is an opening formed in the first wall portion 120a of the housing 120. The intake port 121 takes air A sucked in from inside the sealed casing 11 into the housing 120. The discharge port 122 is an opening formed in the side wall portion 120c, and discharges air in a circumferential direction perpendicular to the rotation axis O of the fan 12.

The second opening 123 is an opening formed in the second wall portion 120b of the housing 120. The second opening 123 is composed of a plurality of openings 123a. The second opening 123 allows air to flow through the housing 120.
Here, when the second opening 123 allows the air A to flow through the housing 120, it means that the second opening 123 is either sucking the air A into the housing 120 or discharging the air A from the housing 120. means that it works. However, the present invention is not limited to this, and the second opening 123 may not be composed of a plurality of openings 123a. For example, it may be configured with one arc-shaped opening provided around the rotation axis O.

The second opening 123 in this embodiment functions as an opening for discharging air A from inside the housing 120. In the fan 12 of this embodiment, at least a portion of the air A taken into the housing 120 from the intake port 121 flows into the second opening 123 of the second wall portion 120b while heading toward the discharge port 122.

As shown in FIG. 2, the fan 12 is arranged in the sealed housing 11 so that the first wall 120a faces the inside of the sealed housing 11 and the second wall 120b faces the heat absorbing part 14. . In this embodiment, the fan 12 is provided in contact with the heat absorbing section 14 . Therefore, the heat absorbing portion 14 closes the second opening 123.

FIG. 4 is a plan view showing the positional relationship between the fan 12 and the heat absorbing section 14. As shown in FIG. FIG. 4 is a diagram showing the positions of the heat absorption part 14 and the fan 12 when the second wall part 120b of the fan 12 is viewed from above along the stacking direction of the heat absorption part 14 and the fan 12 (rotation axis of the fan 12). .
As shown in FIG. 4, the heat absorption part 14 and the fan 12 are arranged so that at least a portion of the heat absorption part 14 and the second opening 123 overlap in plan view. The heat absorbing portion 14 has a surface (opposing surface) 14 a facing the second opening 123 of the fan 12 . In this embodiment, the surface 14a is the heat receiving part 141a of the vapor chamber 140. The heat receiving portion 141a of the heat absorbing portion 14 overlaps the entire second opening 123 in plan view. That is, the heat receiving portion 141a overlaps the plurality of openings 123a forming the second opening 123 in a plan view.

As shown in FIG. 2, in the fan 12 of this embodiment, at least a portion of the air A taken in through the intake port 121 flows into the second opening 123. At this time, the air A flowing into the second opening 123 comes into contact with the heat receiving part 141a of the heat absorbing part 14 and is cooled by heat absorption. The air A cooled by the heat absorption section 14 is returned into the housing 120 through the second opening 123 and is discharged into the sealed casing 11 through the discharge port 122 .

The projector 1 of this embodiment can supply cold air A to the light modulation devices 4R, 4G, and 4B housed in the sealed housing 11 by lowering the temperature of the air A through the heat absorption part 14. ing.

According to the projector 1 of this embodiment described above, the following effects are achieved.
The projector 1 of this embodiment includes a light source 2, light modulators 4R, 4G, and 4B that modulate the light emitted from the light source 2, and projection optics that project the light modulated by the light modulators 4R, 4G, and 4B. a device 6, a sealed housing 11 having a first opening 110 and housing the light modulating devices 4R, 4G, and 4B in a sealed state; A fan 12 having an intake port 121 that takes air A into the housing 120, a discharge port 122 that discharges the air A from the housing 120, and a second opening 123 through which the air A flows; It also includes a heat absorbing part 14 disposed on the outside. The first opening 110 of the sealed housing 11 is sealed by the heat absorption part 14, and the heat absorption part 14 and the fan 12 are arranged such that the heat absorption part 14 and at least a part of the second opening 123 overlap in plan view. It is located.

According to the projector 1 of the present embodiment, by arranging the heat absorbing portion 14 outside the inner surface 111a of the sealed housing 11, the enlargement of the sealed housing 11 can be suppressed, and the second opening 123 provided in the housing 120 can be opened from the second opening 123 provided in the housing 120. The discharged air A can be cooled by the heat absorbing section 14.
Therefore, the projector 1 of the present embodiment has a smaller device configuration, and by cyclically supplying low-temperature air A to the light modulators 4R, 4G, and 4B, which are heat sources, the light modulators 4R, 4G, and 4B are 4G and 4B can be efficiently cooled.

Further, in the projector 1 of the present embodiment, the air A can be supplied to the heat absorption section 14 at a high flow rate by using the air flow generated by the fan 12. This increases the amount of heat absorbed per unit time by the heat absorbing section 14, so that the air A can be efficiently cooled by the heat absorbing section 14.
Furthermore, in the projector 1 of the present embodiment, since a part of the heat absorbing section 14 is not disposed inside the sealed housing 11, the flow of the air A flowing inside the sealed housing 11 is not easily obstructed. Therefore, the air A is stably supplied to the light modulators 4R, 4G, and 4B, which are heat sources, so that the cooling performance of the light modulators 4R, 4G, and 4B can be improved.

In the projector 1 of this embodiment, the heat absorption section 14 includes a vapor chamber 140 that transports the heat absorbed from the air A taken in by the fan 12, and a heat radiation member 149 that releases the heat of the vapor chamber 140.
In the case of the present embodiment, the vapor chamber 140 includes a heat receiving part 141a that receives heat from the air A taken in by the fan 12, and a heat radiating part 142a that radiates the heat received by the heat receiving part 141a to the heat radiating member 149. The liquid working fluid L sealed inside is vaporized by the heat received by the heat receiving part 141a, and the gaseous working fluid L is condensed by heat radiation from the heat radiating part 142a.

According to this configuration, by using the heat absorption section 14 having the vapor chamber 140 and the heat radiating member 149, the cooling performance of the air A discharged from the second opening 123 of the fan 12 can be improved. Therefore, the optical modulators 4R, 4G, and 4B can be efficiently cooled.

In the projector 1 of this embodiment, the heat absorbing section 14 is inserted into the first opening 110 of the sealed housing 11 to seal the first opening 110. Furthermore, an elastic member 16 provided between the heat absorbing portion 14 and the first opening 110 is further provided.

According to this configuration, even if the coefficients of thermal expansion of the sealed casing 11 and the heat absorption section 14 are different, the elastic member 16 fills the gap between the heat absorption section 14 and the first opening 110, so that the inside of the sealed casing 11 is Can maintain airtightness. Thereby, by maintaining the airtightness within the airtight housing 11, it is possible to suppress adhesion of foreign matter and dust to the optical modulators 4R, 4G, and 4B.

In the projector 1 of this embodiment, the housing 120 has a first wall 120a provided with an air intake port 121, and a second wall 120b opposite to the first wall 120a, and the second opening 123 is , are provided on the second wall portion 120b.

According to this configuration, in the fan 12, the second opening 123 can be positioned in the flow direction of the air A toward the intake port 121. Thereby, it is possible to increase the component of the air A taken into the housing 120 from the intake port 121 toward the second opening 123 side. Thereby, the efficiency of cooling the air A taken in by the fan 12 by the heat absorption section 14 can be increased.

In the projector 1 of the present embodiment, the heat absorbing section 14 has a surface 14a (the surface of the heat receiving section 141a) that faces the second opening 123 of the fan 12, and the surface 14a of the heat absorbing section 14 has the second It overlaps with the entire opening 123.

According to this configuration, the air A discharged from the second opening 123 can be efficiently brought into contact with the surface of the heat receiving part 141a. Thereby, the cooling performance of the air A by the heat absorption part 14 can be improved.

(Second embodiment)
Next, a projector according to a second embodiment will be described. This embodiment and the first embodiment differ in the sealing structure of the sealed casing by the heat absorbing part, but the other configurations are common. Therefore, in the following description, the sealed structure of the sealed casing by the heat absorbing part will be mainly explained, and the same components and members as in the first embodiment will be given the same reference numerals, and the details will be omitted or simplified.

FIG. 5 is a sectional view of a main part of the projector of this embodiment. Note that FIG. 5 shows a simplified configuration of the vapor chamber 140.
As shown in FIG. 5, in the projector 100 of the present embodiment, the heat absorbing section 14 contacts the outer surface 111b of the bottom plate 111 in the sealed housing 11 (hereinafter referred to as the outer surface 111b of the sealed housing 11). The opening 110 is sealed. That is, the heat absorbing portion 14 is disposed outside the inner surface 111a of the sealed casing 11. Note that the degree of sealing within the sealed casing 11 may be increased by providing a sealing material or the like between the heat absorbing portion 14 and the outer surface 111b.

In this embodiment, the fan 12 is provided without contacting the heat absorbing section 14. The heat absorbing portion 14 does not close the second opening 123.

FIG. 6 is a plan view showing the positional relationship between the fan 12 and the heat absorbing section 14. As shown in FIG. FIG. 6 is a plan view in the direction in which the heat absorbing portion 14 and the fan 12 are arranged (the thickness direction of the bottom plate 111 of the sealed casing 11).
As shown in FIG. 6, the heat receiving portion 141a of the heat absorbing portion 14 overlaps the entire second opening 123 in plan view. The fan 12 straddles the first opening 110 in a first direction H1 parallel to the short side of the first opening 110, and straddles the first opening 110 in a second direction H2 parallel to the long side of the first opening 110. Instead, it is attached to the bottom plate 111 of the sealed housing 11. Therefore, a space S is created between the fan 12 and the first opening 110 on both sides in the second direction H2, as shown in FIG.

In the projector 100 of this embodiment, a space S communicating with the inside of the sealed housing 11 is provided between the second opening 123 and the heat absorption section 14. Therefore, the second opening 123 of this embodiment functions as an opening that sucks the air A inside the sealed casing 11 into the housing 120. That is, the fan 12 of this embodiment takes in air A into the housing 120 from both sides of the intake port 121 and the second opening 123.

The fan 12 draws air A into the housing 120 through the second opening 123. At this time, air A flows toward the second opening 123 along the surface 14a of the heat absorbing portion 14 within the sealed casing 11. The air A flowing into the second opening 123 comes into contact with the surface 14a of the heat absorbing portion 14, that is, the heat receiving portion 141a, thereby absorbing heat and being cooled. Air A cooled by the heat absorption section 14 is taken into the housing 120 through the second opening 123 and is discharged into the sealed casing 11 from the discharge port 122.

According to the projector 100 of the present embodiment, the heat absorbing portion 14 is placed in contact with the outer surface 111b of the sealed casing 11 so that the heat absorbing portion 14 is disposed outside the inner surface 111a of the sealed casing 11. In addition, the heat absorbing portion 14 can cool the air A taken into the housing 120 of the fan 12 from the second opening 123 provided in the housing 120.
For this reason, in the projector 100 of this embodiment as well, the device configuration is miniaturized and low temperature air A is cyclically supplied to the light modulation devices 4R, 4G, and 4B, which are heat sources. 4R, 4G, and 4B can be efficiently cooled.

(Third embodiment)
Next, a projector according to a third embodiment will be described. This embodiment and the first embodiment differ in the sealed structure of the sealed casing by the heat absorbing part and the positional relationship between the fan and the heat absorbing part. In the following explanation, the sealed structure and the positional relationship between the fan and the sealed case will be mainly explained, and the same components and components as those in the first embodiment will be given the same reference numerals, and the details will be omitted or simplified. do.

FIG. 7 is a sectional view of the main part of the projector of this embodiment. Note that FIG. 7 shows a simplified configuration of the vapor chamber 140.
As shown in FIG. 7, in the projector 200 of this embodiment, the heat absorbing section 14 seals the first opening 110 by contacting the outer surface 111b of the sealed housing 11. That is, the heat absorbing portion 14 is arranged closer to the outer surface 111b than the inner surface 111a of the sealed casing 11, and the surface 14a of the heat absorbing portion 14 is recessed with respect to the inner surface 111a of the sealed casing 11. Note that the degree of sealing within the sealed casing 11 may be increased by providing a sealing material or the like between the heat absorbing portion 14 and the outer surface 111b.

In this embodiment, the fan 12 is placed in the first opening 110 of the sealed housing 11 so as to be in contact with the heat absorbing portion 14 . For this reason, there is a possibility that the outlet 122 of the fan 12 and the side surface 111c of the bottom plate 111 of the sealed casing 11 overlap. Here, the side surface 111c of the bottom plate 111 is a surface that forms the first opening 110 and connects the inner surface 111a and the outer surface 111b. At this time, there is a possibility that the air discharged from the discharge port 122 may be blocked by the bottom plate 111 of the sealed casing 11 .

In contrast, in the projector 200 of the present embodiment, by employing the fan 12 in which the discharge port 122 is formed in a position that does not overlap the side surface 111c of the bottom plate 111 in the sealed housing 11, the discharge from the discharge port 122 of the fan 12 is prevented. This allows the airflow to be unobstructed.

According to the projector 200 of this embodiment, similar to the projector of the above embodiment, the device configuration is miniaturized, and low temperature air A is cyclically supplied to the light modulation devices 4R, 4G, and 4B, which are heat sources. This allows the optical modulators 4R, 4G, and 4B to be efficiently cooled. Furthermore, even when the fan 12 is disposed outside the inner surface 111a of the sealed housing 11, the low-temperature air A is efficiently supplied from the outlet 122 of the fan 12 to the light modulators 4R, 4G, and 4B. be able to.

Note that the technical scope of the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention. Moreover, one aspect of the present invention can be configured by appropriately combining the characteristic parts of each of the above embodiments.

For example, the configuration of the third embodiment and the configuration of the first embodiment can be combined.
In the configuration of the first embodiment, when the surface 14a of the heat absorbing part 14 is arranged closer to the outer surface 111b than the inner surface 111a of the sealed casing 11, the outlet 122 of the fan 12 and the side surface 111c of the bottom plate 111 of the sealed casing 11 are By preventing them from overlapping, the flow of air discharged from the outlet 122 of the fan 12 can be prevented from being obstructed.

Further, in the embodiment described above, the vapor chamber 140 is exemplified as the heat transport member of the heat absorption section 14, but a graphite sheet can also be used as the heat transport member. Further, for example, when the heat absorbing section is made of a material with high thermal conductivity such as copper, the heat absorbing section may be configured only with a heat dissipating member without using a heat transporting member.

In addition, the specific description of the shape, number, arrangement, material, etc. of each component of the projector is not limited to the above embodiment, and can be changed as appropriate. Further, in the above embodiments, a projector using a liquid crystal panel is taken as an example, but the present invention is not limited to this. The present invention is also applicable to a projector using a digital micromirror device as a light modulation device. Further, the projector does not need to have a plurality of light modulation devices, and may have only one light modulation device.

A projector according to one embodiment of the present invention may have the following configuration.
A projector according to one aspect of the present invention includes: a light source that emits light; a light modulation device that modulates the light emitted from the light source; a projection optical device that projects the light modulated by the light modulation device; a casing having an opening and accommodating the light modulation device in a sealed state; an inlet port housed in the casing that takes air in the casing into the housing; and an intake port that discharges the air from the housing. a fan having a discharge port through which the air flows, and a heat absorbing portion disposed outside an inner surface of the housing, the first opening of the housing having a second opening through which the air flows; The fan is sealed by a heat absorbing part, and the heat absorbing part and the second opening of the fan are arranged so as to at least partially overlap in a plan view.

In the projector according to one aspect of the present invention, the heat absorption section includes a heat transport member that transports heat absorbed from the air taken in by the fan, and a heat radiation member that releases the heat of the heat transport member. It may also be a configuration.

In the projector according to one aspect of the present invention, the heat transport member is a vapor chamber, and the vapor chamber includes a heat receiving section that receives heat from the air taken in by the fan; a heat radiating part that radiates heat to the heat radiating member, the liquid refrigerant sealed inside is vaporized by the heat received by the heat receiving part, and the refrigerant is turned into a gas by the heat radiated from the heat radiating part. It may be configured to condense the following.

In the projector according to one aspect of the present invention, the heat absorbing portion seals the second opening by coming into contact with the housing. It may also be a configuration.

In one aspect of the projector of the present invention, the housing includes a first wall portion provided with the intake port, and a second wall portion opposite to the first wall portion, and the second opening is , provided on the second wall and facing the air intake port of the first wall.

In the projector according to one aspect of the present invention, the heat absorbing section has an opposing surface that faces the second opening of the fan, and the opposing surface of the heat absorbing section includes the entire second opening in a plan view. It is also possible to have a configuration that overlaps with the above.

In the projector according to one aspect of the present invention, the heat absorption section may be inserted into the first opening of the housing.

The projector according to one aspect of the present invention may be configured to further include an elastic member provided between the heat absorption section and the first opening.

DESCRIPTION OF SYMBOLS 1,100,200... Projector, 2... Light source, 4B, 4G, 4R... Light modulation device, 6... Projection optical device, 11... Sealed housing, 12... Fan, 14... Heat absorption part, 16... Elastic member, 110... First opening, 111a...Inner surface, 120...Housing, 120a...First wall, 120b...Second wall, 121...Intake port, 122...Discharge port, 123...Second opening, 123a...Opening, 140...Vapor chamber (Heat transport member), 141a... Heat receiving part, 142a... Heat radiating part, 149... Heat radiating member, A... Air, L... Working fluid (refrigerant).

Claims (8)

a light source that emits light;
a light modulation device that modulates the light emitted from the light source;
a projection optical device that projects the light modulated by the light modulation device;
a sealed casing having a first opening and accommodating the light modulation device in a sealed state;
The device is housed in the sealed casing and includes a housing, an intake port that takes air in the sealed casing into the housing, an outlet that discharges the air from the housing, and a second opening through which the air flows. with fans,
a heat absorbing part disposed outside the inner surface of the sealed casing,
the first opening of the sealed casing is sealed by the heat absorption part;
The heat absorption part and the fan are arranged so that the heat absorption part and at least a part of the second opening overlap in plan view.
A projector characterized by: The heat absorption part includes a heat transport member that transports heat absorbed from the air taken in by the fan, and a heat radiation member that releases heat from the heat transport member.
The projector according to claim 1, characterized in that: The heat transport member is a vapor chamber,
The vapor chamber includes a heat receiving part that receives heat from the air taken in by the fan, and a heat radiating part that radiates the heat received by the heat receiving part to the heat radiating member, and the vapor chamber includes a heat receiving part that receives heat from the air taken in by the fan and a heat radiating part that radiates the heat received by the heat receiving part to the heat radiating member. vaporizes the liquid refrigerant sealed inside, and condenses the gaseous refrigerant by heat radiation from the heat radiation part;
The projector according to claim 2, characterized in that: The heat absorption part seals the first opening by contacting the sealed casing.
The projector according to any one of claims 1 to 3, characterized in that: The heat absorption part seals the first opening by being inserted into the first opening of the sealed casing.
The projector according to any one of claims 1 to 3, characterized in that: further comprising an elastic member provided between the heat absorption part and the first opening;
The projector according to claim 5, characterized in that: The housing has a first wall portion provided with the air intake port, and a second wall portion opposite to the first wall portion,
the second opening is provided in the second wall;
The projector according to any one of claims 1 to 6, characterized in that: The heat absorption part has a facing surface facing the second opening of the fan,
The opposing surface of the heat absorption part overlaps the entire second opening in plan view.
The projector according to any one of claims 1 to 7, characterized in that:

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