JP7282604B2 - Optical Enclosure and Projector Equipped with the Same - Google Patents

Description

The present invention relates to an optical housing and a projector including the same.

2. Description of the Related Art Conventionally, in a projector, since a plurality of optical parts arranged inside absorb light energy from a light source and generate heat, they are blown with cooling air. If dust or the like adheres to the optical components, it will lead to a decrease in brightness, so the cooling air is circulated inside the sealed structure in order to prevent dust from entering. A heat exchanger that exchanges heat with the outside air is arranged inside the sealed structure in order to suppress the temperature rise of the cooling air due to circulation.

In Patent Document 1, when cooling an optical component arranged inside a closed structure using a fan, in order to efficiently perform heat exchange of the cooling air with the outside air, the heat exchanger has a duct shape before and after the heat exchanger. is disclosed.

Japanese Patent No. 5150987

However, in the projection display apparatus of Patent Document 1, forming the duct increases the size of the apparatus. In addition, since the fan is arranged outside the sealed structure, the driving sound of the fan leaks to the outside.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical housing and a projector that can be miniaturized and that can suppress noise caused by a fan.

An optical housing as one aspect of the present invention includes a housing, a plurality of optical components at least partially housed inside the housing, and at least some of which are housed inside the housing. a first fan for blowing air to a first optical component out of the plurality of optical components so as to circulate air in the housing; A second fan that blows air to the second optical component among the plurality of optical components, the air that is stored inside the housing and circulated inside the housing by the first fan, and the housing by the second fan a heat exchanger that absorbs heat inside the housing and radiates heat to the outside of the housing by passing the air circulated inside the housing, and the heat exchanger is an intake port of the first fan, and the intake port of the second fan.

According to the present invention, it is possible to provide an optical housing and a projector that can be miniaturized and that can suppress noise caused by a fan.

1 is a schematic configuration diagram of a projector according to an embodiment of the invention; FIG. FIG. 4 is an explanatory diagram of the optical arrangement of the projector; 1 is a configuration diagram of a color separation/synthesis optical system; FIG. 3 is a configuration diagram of an optical housing; FIG. It is an assembly perspective view of an optical housing. FIG. 4 is a diagram showing a relative positional relationship between a fan and fins; FIG. 4 is a diagram showing the flow of cooling air; FIG. 4 is a diagram showing the flow of cooling air;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals are given to the same members, and overlapping descriptions are omitted.

FIG. 1 is a schematic configuration diagram of a projector (projection display device) 10 according to an embodiment of the invention. FIG. 2 is an explanatory diagram of the optical arrangement of the projector 10. As shown in FIG.

An optical housing 50 , a light source optical system 4 , an illumination optical system 5 , and a projection lens 6 are provided inside the exterior housing 100 of the projector 10 . A color separation/synthesis optical system 3 is provided inside the optical housing 50 .

Exterior housing 100 has intake ports 101 a and 101 b for introducing external air into exterior housing 100 and exhaust port 102 for exhausting air within exterior housing 100 . Inside the exterior housing 100, there are provided a fan (third fan) 7 that guides outside air to the optical housing 50 after the intake ports 101a and 101b, and guides the air inside the exterior housing 100 to the exhaust port 102. Fans 8a, 8b, 8c are provided. In this embodiment, axial fans are used as the fans 7, 8a, 8b and 8c.

The light source optical system 4 includes a plurality of optical components including a plurality of laser diodes (hereinafter referred to as LDs) 41 and phosphor units 42, and irradiates the illumination optical system 5 with light from the LD 41 as a light source. The LD 41 has a plurality of LDs 41B each outputting blue (B) band light, and a plurality of LDs 41R each outputting red (R) band light. The phosphor unit 42 includes a phosphor 421 , a phosphor wheel 422 on which the phosphor 421 is applied in an annular shape, and a motor 423 for rotating the phosphor wheel 422 . The phosphor wheel 422 is a disk-shaped metal plate having a high reflectance. The phosphor 421 has a fluorescent material that has the property of generating fluorescence in the yellow band using the excitation light from the LD 41B. Further, the phosphor 421 has a binder mixed with a diffusing material for diffusely reflecting the excitation light from the LD 41B that has not undergone fluorescence conversion and the light from the LD 41R as excitation light.

Illumination optical system 5 includes fly-eye lenses 51 and 52 that can obtain a light beam with little color unevenness because the brightness is uniformed by transmission and also colors are superimposed, and the polarization direction is aligned by transmission. It includes a plurality of optical components including a polarization conversion element 53 that converts the light into a light flux. The light incident on the illumination optical system 5 passes through the condenser lens 54 and is applied to the color separation/synthesis optical system 3 .

FIG. 3 is a configuration diagram of the color separation/synthesis optical system 3. As shown in FIG. The color separation/synthesis optical system 3 has a cross dichroic mirror 32, a reflecting mirror 33, a dichroic mirror 34, panel units 30R, 30G and 30B, and optical units 31R, 31G and 31B. In this embodiment, the panel units 30R, 30G, 30B and the optical units 31R, 31G, 31B are the objects to be cooled. The cross dichroic mirror 32 separates the light from the illumination optical system 5 into mixed color light of green (G) light and blue (B) light and red (R) light. The dichroic mirror 34 reflects G light and transmits B light. Panel units 30R, 30G, and 30B are panel units for R, G, and B, respectively. The panel unit 30R (30G, 30B) has a reflective liquid crystal panel 301R (301G, 301B) and a retardation compensator 302R (302G, 302B). Optical units 31R, 31G, and 31B are optical units for R, G, and B, respectively. The optical unit 31R (31G, 31B) includes a condenser lens 311R (311G, 311B), a λ/2 plate 312R (312G, 312B), a reflective polarizing plate 313R (313G, 313B), and a wire grid (WG) polarizer 314R. (314G, 314B). Light transmitted through the WG polarizer 314R (314G, 314B) is guided to the reflective liquid crystal panel 301R (301G, 301B) and reflected by the reflective liquid crystal panel 301R (301G, 301B). After that, the light is reflected again by the WG polarizer 314R (314G, 314B), and the R, G, and B lights are combined and projected onto a screen (not shown).

FIG. 4 is a configuration diagram of the optical housing 50. As shown in FIG. 5 is an assembled perspective view of the optical housing 50. FIG. Cases (housings) 11 and 12 form a sealed structure (flow path 1) inside the optical housing 50 . By forming the flow path 1 inside the optical housing 50, it is possible to prevent dust mixed from the outside from adhering to the optical components, thereby suppressing a decrease in the brightness of the optical components.

A plurality of optical components (panel units 30R, 30G, 30B and optical units 31R, 31G, 31B) are provided in the flow path 1 . At least part of the plurality of optical components may be housed in the flow channel 1 as shown in FIG. Further, in the flow path 1, there are a fan (first fan) 21 that blows air to cool the optical unit 31B, and a fan (second fan) 22 that blows air to cool the optical units 31R and 31G. is provided. At least a portion of the fans 21 and 22 should be housed inside the flow path 1 . Since the fans 21 and 22 are provided inside the flow path 1, noise generated from the fans 21 and 22 can be suppressed. In this embodiment, sirocco fans with high static pressure are used as the fans 21 and 22 . Cooling air from the outlets of the fans 21 and 22 is led to the air inlets of the fans 21 and 22 after being guided to the optical units 31R, 31G and 31B. In this embodiment, two fans are used to cool the object to be cooled, but two or more fans may be used.

A member with high thermal conductivity is used as the cases 11 and 12 . In this embodiment, aluminum is used. Moreover, the cases 11 and 12 may be formed separately without being limited to one piece. The case 11 is provided with fins 13 as a heat exchanger that absorbs heat from the air warmed by cooling the object to be cooled and radiates the heat to the outside of the flow path 1 . Further, the case 11 is provided with fins 14 for improving the efficiency of heat exchange with the outside air. Fins 13 and 14 are provided inside and outside the channel 1, respectively.

FIG. 6 is a diagram showing the relative positional relationship between the fans 21, 22 and the fins 13. As shown in FIG. The fans 21 and 22 and the fins 13 are provided in the relationship shown in FIG. 6(a) in this embodiment, but are provided in the relationship shown in FIGS. 6(b) and 6(c). good too.

The fan 21 (21b, 21c) sucks air from the intake port 211 (211b, 211c). Arrows 212 (212b, 212c) indicate the intake directions of the fans 21 (21b, 21c). The fan 22 (22b, 22c) sucks air from the intake port 221 (221b, 221c). Arrows 222 (222b, 222c) indicate the intake directions of the fans 22 (22b, 22c). Some of the fins 13 (13b, 13c) face the intake ports 211 (211b, 211c) of the fans 21 (21b, 21c) and the intake ports 221 (221b, 221c) of the fans 22 (22b, 22c). are placed in By arranging them in this way, the size of the optical housing 50 can be reduced.

In the space defined by the first plane including the intake port 211 and the second plane including the intake port 221, the angle formed by the first plane and the second plane of the fin 13 is as shown in FIG. is preferably arranged in a space that is approximately 90 degrees or an obtuse angle as shown in FIG.

7 and 8 are diagrams showing the flow of cooling air from the fans 21 and 22. FIG. The cooling air from the fan 21 cools the optical unit 31B. The cooling air from the fan 22 cools the optical unit 31G and then cools the optical unit 31R. The warmed air after cooling the optical units 31R, 31G, and 31B passes through the fins 13. As shown in FIG. The fins 13 absorb heat from the warmed air and dissipate the heat to the outside of the flow path 1 . Therefore, the heated air after cooling the optical units 31R, 31G, and 31B passes through the fins 13, becomes cooled air, and is sucked by the fans 21 and 22. FIG. Therefore, it is possible to suppress an increase in the temperature of the cooling air from the fans 21 and 22 and maintain a state in which the cold air is blown to the object to be cooled, thereby increasing the cooling efficiency. Further, since the flow path 1 is formed by the cases 11 and 12 having high thermal conductivity and the fins 13 are integrally formed with the case 11, the heat radiation area in the flow path 1 can be increased. Therefore, the efficiency of dissipating the heat in the flow path 1 to the outside of the flow path 1 can be increased. Further, by guiding the wind from the fan 7 to the fins 14 , the heat exchange between the outside air and the air in the flow path 1 can be further improved through the fins 14 , the flow paths 1 and the fins 13 .

The winds circulating in the flow path 1 pass through separate flow paths at the outlets of the fans 21 and 22, but after cooling the objects to be cooled, they merge in the space in front of the fins 13 as shown in FIG. , passes through the fins 13 . This enables heat exchange by the same fins 13, and even if there is a temperature difference in separate flow paths, the temperature of the air taken in by the fans 21 and 22 becomes substantially the same, and the flow path resistance is reduced. Therefore, it is possible to increase the cooling efficiency and to reduce the size of the fins 13 .

Further, in this embodiment, the distance d between the fins 13 and the air intake 211 of the fan 21 and the distance d between the fins 13 and the air intake 221 of the fan 22 shown in FIG. It is set below. By setting in this way, the heat exchange of the fins 13 can be efficiently performed without significantly deteriorating the cooling performance. Further, by arranging the fins 13 near the intake ports 211 and 221, the fins 13 can be made smaller than when fins are arranged separately for the fans 21 and 22, and space efficiency can be improved. In addition, it is desirable to set the distance d to 20 mm or less, and more preferably to set it to 15 mm or less.

As shown in FIG. 7, a gap width (fin-shaped fin gap) 13G, which is the interval between the concave portions of the fins 13, is set to be narrower than a gap width 14G, which is the interval between the concave portions of the fins 14. As shown in FIG. By setting in this way, the contact area with the air passing through the fins 13 can be increased, so that the efficiency of heat exchange of the fins 13 can be improved and the temperature of the air taken in by the fans 21 and 22 can be lowered. can be done. In addition, since the fan 7, which is an axial fan, has a low static pressure but a large flow rate, widening the gap width 14G of the fins 14 can reduce the flow resistance and increase the flow rate, thereby improving the efficiency of heat exchange. can be improved. Since the flow path resistance of the fins 14 is low, the number of revolutions of the fan 7 arranged outside the flow path 1 can be reduced, so that noise generated by the fan 7 can be suppressed. In this embodiment, the fans 21 and 22 are sirocco fans, and the static pressure of the sirocco fans is strong, and due to the characteristics that require high rotation to increase the air volume, the flow speed that can pass through the fins 13 with a narrow gap width of 13G can be ensured.

As described above, the fins 13 inside the flow path 1 can exchange heat even if the flow path resistance is high, and the fins 14 outside the flow path 1 want to suppress the flow path resistance. may be shorter than the length of the fins 13 .

As described above, according to the present embodiment, it is possible to provide the optical housing 50 that can be miniaturized and that can suppress the noise caused by the fan, and the projector 10 including the optical housing 50 .

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist.

11, 12 case (enclosure)
13 fins (heat exchanger)
21 fan (first fan)
211 air inlet 22 fan (second fan)
221 Intake port 30R, 30G, 30B Panel unit (optical part)
31R, 31G, 31B optical units (optical parts)
50 optical housing

Claims (13)

a housing;
a plurality of optical components at least partially housed inside the housing;
a first fan, at least part of which is housed inside the housing, for blowing air to a first optical component among the plurality of optical components so as to circulate air inside the housing;
a second fan, at least part of which is housed inside the housing, for blowing air to a second optical component among the plurality of optical components so as to circulate air inside the housing;
The air stored inside the housing and circulated inside the housing by the first fan and the air circulated inside the housing by the second fan pass through the housing, and a heat exchanger that absorbs heat inside the housing and dissipates it to the outside of the housing,
The optical housing, wherein the heat exchanger is arranged to face the intake port of the first fan and the intake port of the second fan. 2. The optical enclosure of claim 1, wherein the first and second fans are sirocco fans. 3. The optical housing according to claim 1, wherein at least part of said housing is made of metal. 4. The optical housing according to any one of claims 1 to 3 , wherein the distance between the intake ports of the first and second fans and the heat exchanger is 25 mm or less. In the housing, air from the first fan after passing through the first optical component and air from the second fan after passing through the second optical component are subjected to the heat exchange. 5. The optical housing according to any one of claims 1 to 4 , wherein a space is provided for merging before passing through the optical housing. The heat exchanger has a space defined by a first plane including an air intake of the first fan and a second plane including an air intake of the second fan. 6. The optical housing according to any one of claims 1 to 5 , wherein the optical housing is disposed in a space forming an obtuse angle with two planes. 7. The optical housing according to any one of claims 1 to 6 , further comprising fins arranged outside the housing. The heat exchanger has a fin shape,
8. The optical enclosure of claim 7 , wherein the fin gap of the heat exchanger is smaller than the fin gap of the fins. 9. The optical housing according to any one of claims 1 to 8 , wherein the housing has a closed structure. an optical housing according to any one of claims 1 to 9 ;
A projector, comprising: an exterior housing for housing the optical housing. 11. The projector according to claim 10 , further comprising a third fan for guiding outside air, which has flowed in from an air intake provided in said exterior housing, to said optical housing. 12. A projector according to claim 11 , wherein said third fan is an axial fan. 13. The projector according to claim 11 , wherein the rotation speed of said third fan is lower than the rotation speed of said first and second fans.

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