JP5157792B2 - Projector and light source device - Google Patents

Description

The present invention relates to a projector and a light source device, and more particularly to a technology of a projector including a heat source such as a light source device.

In the light source device used for the projector, most of the electric energy input to the light source device becomes heat or light in the infrared region, and the light source device itself becomes extremely high at 800 ° C. to 1000 ° C. As a technique for absorbing heat generated in the light source device and light in the infrared region, for example, a refrigerant flow path is provided on the back surface of the reflector of the light source device (see Patent Document 1), or a liquid phase on the back surface of the reflector. The thing which directly arrange | positioned the refrigerant | coolant (refer patent document 2) is disclosed.

JP 2005-331743 A JP 2002-107825 A

When the light source device reaches the end of its life, it is necessary to replace the light source device. However, if a refrigerant flow path is provided on the rear surface of the reflector of the light source device or a liquid-phase refrigerant is directly disposed, the refrigerant flow path or the like may become an obstacle when the light source device is taken out from the projector. That is, when the light source device is replaced, there arises a problem that it becomes difficult to replace the light source device due to a refrigerant flow path or the like provided on the back surface of the reflector.

SUMMARY An advantage of some aspects of the invention is that it provides a projector that can efficiently absorb heat generated by a light source device and that can be easily replaced, and the light source device.

In order to solve the above-described problems and achieve the object, a projector according to the present invention reflects a light emitting unit that emits light and illumination light emitted from the light emitting unit in a predetermined direction and is emitted from the light emitting unit. And a first light reflection device for transmitting light in the infrared region, and a projector for displaying an image using illumination light, the light source device being arranged around the first reflection means And a take-out port is formed that allows the light source device to be taken out in a direction different from the predetermined direction,
A heat-absorbing unit for the light source that absorbs heat from the light source device; and a second reflecting unit that reflects the light in the infrared region that passes through the first reflecting unit and travels toward the outlet toward the heat-absorbing unit for the light source.

Since the outlet is formed in the heat absorbing means for the light source that houses the light source device, the light source device can be easily taken out from the projector. Therefore, the light source device can be easily replaced when the light source device reaches the end of its life. Moreover, since the light of the infrared region which permeate | transmits the 1st reflection means and goes to an extraction port is reflected toward the heat absorption means for light sources by the 2nd reflection device, the light of an infrared region will leak from an extraction port part. Can be prevented. Accordingly, the heat generated by the light in the infrared region transmitted through the first reflecting means can be efficiently absorbed by the light source heat absorbing means.

Moreover, as a preferable aspect of the present invention, it is desirable that the second reflecting means is provided integrally with the light source device. Since the second reflecting means is provided integrally with the light source device, if the light source device is taken out, the second reflecting means is also taken out, so that the second reflecting means does not get in the way when the light source device is taken out. Therefore, the light source device can be replaced more easily.

Moreover, as a preferable aspect of the present invention, it is desirable that the second reflecting means is integrally formed with a housing that constitutes the outline of the light source device, and a metal is deposited on the surface. Since the second reflecting means is integrally formed with the housing, the second reflecting means can be made of the same material as the housing, and the manufacturing cost can be suppressed. Further, since the metal is deposited on the surface, even if the housing material itself does not have the property of reflecting the light in the infrared region, the second reflecting means can be provided with the property of reflecting the light in the infrared region.

Moreover, as a preferable aspect of the present invention, it is preferable that a lid portion for closing the outlet is further provided, and the second reflecting means is provided integrally with the lid portion. Since the second reflecting means is provided integrally with the lid portion that closes the outlet, the second reflecting means is also removed together with the lid when the light source device is taken out. Therefore, when inspecting the light source device accommodated in the light source heat absorbing means, the light source device can be easily confirmed without being obstructed by the second reflecting means. Further, since the second reflecting means is provided separately from the light source device, the cost of the light source device itself can be suppressed. Thereby, the replacement cost of the light source device can be suppressed.

Moreover, as a preferable aspect of the present invention, it is desirable that unevenness is formed on at least a part of the inner wall surface on the first reflecting means side in the heat absorbing means for the light source. The surface area of the inner wall surface of the heat absorbing means for the light source can be increased by the unevenness. Thereby, the heat by the light of the infrared region which permeate | transmitted the 1st reflection means can be more efficiently absorbed into the heat absorption means for light sources.

Further, as a preferred aspect of the present invention, the heat sink for the light source has a refrigerant flow path formed therein, the refrigerant flowing through the refrigerant flow path absorbs heat from the light source device, and the heat is absorbed by the light source heat sink. An ejector pump that allows the absorbed refrigerant to pass through, a radiator that dissipates the heat of the refrigerant that has flowed out of the ejector pump, and an evaporator that evaporates and cools the stored refrigerant, from a heat source other than the light source device. It is desirable that heat is absorbed by the refrigerant cooled by the evaporator, and the ejector pump depressurizes the inside of the evaporator by a pressure drop due to passage of the refrigerant that has absorbed heat by the light source heat absorbing means.

The projector may include a cooling fan for cooling a heat source other than the light source device. However, if the refrigerant cooled by the evaporator absorbs heat from a heat source other than the light source device, the air volume of the cooling fan can be reduced. In some cases, a cooling fan for cooling a heat source other than the light source unit can be eliminated. Accordingly, it is possible to suppress the operation noise of the cooling fan and improve the silence of the projector. In addition, the refrigerant inside the evaporator is deprived of heat of vaporization during evaporation and cooled.

Further, since the inside of the evaporator is decompressed by the ejector pump, the boiling temperature of the refrigerant inside the evaporator can be lowered. Therefore, even if the temperature around the evaporator is about room temperature, the temperature of the refrigerant inside the evaporator can be lowered from the room temperature. By cooling using a temperature lower than the room temperature, it is possible to cool the temperature of the heat source other than the light source device lower than the conventional air cooling using the air in the casing of about room temperature.

In some cases, the projector generates a low temperature by a cooling device including a compressor to cool the temperature of a heat source other than the light source device. Since the low temperature is generated by the decompression of the inside of the evaporator by the ejector pump, the power consumption can be suppressed as compared with the case of using the cooling device provided with the compressor. Further, the ejector pump is easier to miniaturize than the compressor, and can contribute to the miniaturization of the projector itself.

Also, since the refrigerant that has absorbed the heat from the light source section is passed through the ejector pump to reduce the pressure inside the evaporator, there is no need to provide a compressor for reducing the pressure inside the evaporator. Downsizing and power consumption can be reduced.

Moreover, as a preferable aspect of the present invention, it is desirable to evaporate the refrigerant in the heat absorbing means for the light source. The refrigerant evaporates in the heat absorbing means for the light source to become a gas phase refrigerant. The gas-phase refrigerant is easier to pass through the ejector pump at a higher speed than the liquid-phase refrigerant. The ejector pump can increase the pressure drop as the speed of the fluid passing through it increases.
By evaporating the refrigerant in the heat-absorbing means for the light source, the pressure inside the evaporator can be easily reduced. If the pressure inside the evaporator is reduced to a pressure at which the boiling temperature of the refrigerant becomes room temperature or lower, the temperature of the refrigerant inside the evaporator can be cooled to room temperature or lower.

As a preferred embodiment of the present invention, the heat source is desirably an optical element that modulates light emitted from the light emitting section. The optical element is easily deteriorated by a temperature rise. The temperature of the optical element rises when irradiated with light emitted from the light-emitting unit, but the life of the product is prevented by absorbing the heat from the optical element in the refrigerant cooled inside the evaporator, preventing the temperature of the optical element from rising. Can be extended.

Furthermore, the light source device according to the present invention includes a light emitting unit that emits light, and a first light that reflects illumination light emitted from the light emitting unit in a predetermined direction and transmits light in an infrared region emitted from the light emitting unit. A reflecting means; and a second reflecting means for reflecting the light in the infrared region that has passed through the first reflecting means.

Since the light source device has the second reflecting means for reflecting the light in the infrared region that has passed through the first reflecting means, the light in the infrared region can be reflected in a desired direction by the second reflecting means. For example, the location where heat is generated by the light in the infrared region can be limited by condensing the light in the infrared region in a certain region.

Further, as a preferred aspect of the present invention, the light source device is housed and used in a light source heat absorbing means provided in the projector to absorb heat from the light source device, and the second reflecting means is
It is desirable to reflect light in the infrared region toward the heat absorbing means for the light source. Since the second reflecting means reflects the light in the infrared region toward the heat absorbing means for the light source, the heat generated by the light in the infrared region can be efficiently absorbed by the heat absorbing means for the light source.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a schematic configuration of a projector according to an embodiment of the present invention. The projector 1 includes a light source device 3, a spatial light modulation device (optical element) 4, and a cooling system S <b> 1 inside a housing 50. The housing 50 is formed with a light source accommodation portion 50 a for accommodating the light source device 3. Further, the light source housing 50a is closed with a lid 50b. The projector 1 is a front projection projector that supplies light from a light source device to a screen (not shown) via a projection lens 48 and observes an image by observing light reflected by the screen. In the description of the embodiment of the present application, the axis from the light source device 3 toward the projection lens 48 is a Z axis. The axes orthogonal to the Z axis and perpendicular to each other are defined as an X axis and a Y axis. Further, the arrow direction of each axis is a positive direction, and the opposite direction is a negative direction.

FIG. 2 is an external perspective view of the light source device 3. The light source device 3 includes an arc tube (light emitting unit) 6, a reflector 8 (first reflecting means), a housing 10, and an IR reflecting mirror (second reflecting means) 12. The arc tube 6 is, for example, an ultra high pressure mercury lamp. The arc tube 6 emits light by forming an arc between electrodes (not shown), and becomes extremely high at 800 ° C. to 1000 ° C. during light emission.

An arc tube 6 is attached to the reflector 8. Of the light emitted from the arc tube 6, visible light is reflected as illumination light in a positive direction (predetermined direction) along the Z axis. In addition, the reflector 8 transmits light in the infrared region of the light emitted from the arc tube 6. That is, the reflector 8 is a cold mirror that reflects visible light but transmits light in the infrared region.

The housing 10 constitutes an outline of the light source device 3. The housing 10 includes a reflector 8
Is attached. The housing 10 supports the reflector 8 and positions the reflector 8 in the light source housing 50a.

The IR reflecting mirror 12 is for reflecting a part of the light in the infrared region that has passed through the reflector 8. The IR reflecting mirror 12 is integrally formed with the housing 10 so as to extend in a direction opposite to the direction in which the illumination light is emitted (a negative direction along the Z axis). The IR reflecting mirror 12 is
The light source device 3 is formed so as to be positioned closer to the outlet 14a side of the absorption evaporator 14 than the reflector 8 in a state where the light source apparatus 3 is accommodated in the absorption evaporator 14 described later (see also FIG. 4). The IR reflecting mirror 12 is formed by depositing metal on a portion extending from the housing 10 and has a property of reflecting light in the infrared region. By using gold as the metal to be deposited, light in the infrared region can be reflected efficiently. The IR mirror 12 can reflect a part of the light in the infrared region transmitted through the reflector 8 in a desired direction. In the present embodiment, the light source device 3 is applied to the projector 1 and light in the infrared region is reflected by an IR mirror 12 toward an absorption evaporator 14 described later.

The spatial light modulator 4 is a transmissive liquid crystal display device that modulates light emitted from the arc tube 6 according to an image signal. The light modulated by the spatial light modulator 4 is projected onto a screen (not shown) to display an image. The temperature of the spatial light modulator 4 rises due to irradiation of light emitted from the arc tube 6. The heat generated by the spatial light modulator 4 is transmitted to the heat transfer means 26 described later and absorbed by the refrigerant inside the low-temperature heat exchanger (evaporator) 24. The spatial light modulation device 4 includes three light beams for R light, G light, and B light. Only one of them is illustrated and described.

The cooling system S1 has an absorption evaporator (light source heat absorption means) 14, a circulation pump 16, an ejector pump 18, a radiator (heat radiator) 20, a cooling fan 22, a low-temperature heat exchanger 24, and a heat transfer means 26. Composed. The absorption evaporator 14, the circulation pump 16, the ejector pump 18, the radiator 20, and the low temperature heat exchanger 24 are connected via a refrigerant pipe 28.

FIG. 3 is an external perspective view of the absorption evaporator 14. FIG. 4 is an external perspective view showing a state in which the light source device 3 is accommodated in the absorption evaporator 14. The absorption evaporator 14 is disposed in the light source container 50a (see also FIG. 1) and constitutes a part of the wall surface of the light source container 50a. The absorption evaporator 14
The box shape which can accommodate the light source device 3 is exhibited. In a state in which the light source device 3 is accommodated, the absorption evaporator 14 is disposed around the reflector 8. The lid 50b described above.
Has a function of closing the outlet 14 a of the absorption evaporator 14.

The absorption evaporator 14 has an opening on the surface in the positive direction of the Z-axis so that illumination light can be emitted from the light source device 3. Further, the absorption evaporator 14 has an opening on the positive side of the Y axis, and serves as an outlet 14a from which the light source device 3 can be taken out. The absorption evaporator 14 is made of a metal material having high thermal conductivity, for example, aluminum. The absorption evaporator 14 is formed with a refrigerant flow path 14b through which refrigerant passes. Reflector 8 of absorption evaporator 14
Concavities and convexities are formed on the inner wall surface on the side. Further, the inner wall surface on the reflector 8 side of the absorption evaporator 14 is subjected to a surface treatment for improving the light absorption efficiency. For example, the surface treatment is performed so that the emissivity is 0.8 or more, and most of the light in the infrared region irradiated on the inner wall surface is absorbed.

FIG. 5 is a cross-sectional view showing a state in which the light source device 3 is accommodated in the absorption evaporator 14. Most of the infrared region light emitted from the arc tube 6 and transmitted through the reflector 8 is directly applied to the inner wall surface of the absorption evaporator 14 to raise the temperature of the absorption evaporator 14. The absorption evaporator 14 causes the refrigerant flowing through the refrigerant flow path 14b to absorb the heat generated by the irradiation of light in the infrared region. The refrigerant absorbs heat in the course of flowing through the refrigerant flow path 14b and evaporates at a temperature higher than the boiling temperature.

Of the infrared region light that has passed through the reflector 8, the infrared region light that travels toward the outlet 14 a of the absorption evaporator 14 is reflected by the IR reflection mirror 12 and travels toward the inner wall surface of the absorption evaporator 14. Thereby, it can prevent that the light of an infrared region leaks from the outlet 14a part. In other words, the infrared region light transmitted through the reflector 8 can be collected in the absorption evaporator 14, and the heat generated by the infrared region light can be efficiently absorbed by the absorption evaporator 14. Also,
Since the inner wall surface of the absorption evaporator 14 is uneven, the surface area is increased. Thereby, compared with the case where the inner wall surface of the absorption evaporator 14 is flat, the heat absorption efficiency of the absorption evaporator 14 can be improved. Furthermore, since the inner wall surface of the absorption evaporator 14 is subjected to a surface treatment that increases the light absorption efficiency, the heat absorption efficiency of the absorption evaporator 14 can be further increased.

The circulation pump 16 functions as a power source for circulating the refrigerant among the absorption evaporator 14, the ejector pump 18, the radiator 20, and the low-temperature heat exchanger 24 that are connected to each other via the refrigerant pipe 28. As the refrigerant, for example, water, hydrofluoroether, fluorine-based inert liquid, propylene glycol, ethylene glycol, or the like is used.

The ejector pump 18 has a coaxial double nozzle shape in which the sub nozzle 18b surrounds the main nozzle 18a. Further, a communication hole 18c for communicating the main nozzle 18a and the sub nozzle 18b is formed in the wall surface of the main nozzle 18a. An absorption evaporator 14 is connected to the main nozzle 18a of the ejector pump 18 via a refrigerant pipe 28, and the refrigerant that has become a gas phase in the absorption evaporator 14 flows into the main nozzle 18a. Further, a low temperature heat exchanger 24 is connected to the sub nozzle 18 b of the ejector pump 18 through a refrigerant pipe 28.

When the refrigerant passes through the main nozzle 18a, the pressure in the sub nozzle 18b is reduced through the communication hole 18c. Thereby, the inside of the low-temperature heat exchanger 24 connected to the sub nozzle 18b is depressurized. That is, the ejector pump 18 functions as a decompression unit that decompresses the inside of the low-temperature heat exchanger 24. As will be described in detail later, a refrigerant is accommodated in the low-temperature heat exchanger 24. When the inside of the low-temperature heat exchanger 24 is depressurized by the ejector pump 18, the boiling temperature of the refrigerant is lowered and the refrigerant is easily evaporated. A vapor phase refrigerant is generated by the evaporation of the refrigerant inside the low temperature heat exchanger 24. When the vapor phase refrigerant evaporates, it takes heat of vaporization from the liquid phase refrigerant. The gas-phase refrigerant generated in the low-temperature heat exchanger 24 passes through the sub nozzle 18b and the main nozzle 18a.
The refrigerant 20 is drawn in and merged with the gas-phase refrigerant sent from the absorption evaporator 14.
Is sent to. The ejector pump 18 has a higher pressure reducing effect on the sub nozzle 18b as the speed of the fluid passing through the main nozzle 18a is higher. In the present embodiment, the refrigerant passing through the main nozzle 18a evaporates in the absorption evaporator 14 and becomes a gas-phase refrigerant. it can. Therefore, the sub nozzle 18b
The pressure reducing effect can be enhanced, and the pressure inside the low-temperature heat exchanger 24 can be made lower. Thereby, the evaporation temperature of the refrigerant inside the low-temperature heat exchanger 24 is further lowered.

The radiator 20 radiates the heat absorbed by the refrigerant in the absorption evaporator 14 and the heat taken as vaporization heat in the low-temperature heat exchanger 24 to the outside air. A flow path (not shown) through which the refrigerant flows is formed inside the radiator 20. The gas-phase refrigerant sent from the ejector pump 18 is
By being cooled in the process of flowing through the flow path in the radiator 20, it is condensed and becomes a liquid phase refrigerant. The refrigerant that has passed through the radiator 20 is directed to the absorption evaporator 14 via the circulation pump 16. Since the liquid phase refrigerant is less likely to decrease in volume when pumped than the gas phase refrigerant, the circulation pump 16 that pumps the liquid phase refrigerant can be smaller than a compressor that pumps the gas phase refrigerant.

A refrigerant pipe 28 connecting the radiator 20 and the absorption evaporator 14 branches in the middle and is connected to the low temperature heat exchanger 24. Therefore, a part of the refrigerant flowing out of the radiator 20 goes to the low temperature heat exchanger 24 and is accommodated therein. The cooling fan 22 causes the air around the radiator 20 to flow to increase the cooling efficiency of the refrigerant.

The low-temperature heat exchanger 24 cools the refrigerant by evaporating the refrigerant accommodated therein. When the refrigerant evaporates inside the low-temperature heat exchanger 24, the refrigerant is deprived of heat of vaporization and cooled. Since the inside of the low-temperature heat exchanger 24 is depressurized by the ejector pump 18, the boiling temperature of the refrigerant decreases.
Thereby, the temperature of the refrigerant accommodated in the low-temperature heat exchanger 24 is cooled to a temperature near the boiling temperature. If the inside of the low-temperature heat exchanger 24 is depressurized so that the boiling temperature of the refrigerant is below room temperature,
The refrigerant inside the low-temperature heat exchanger 24 can be cooled to room temperature or lower. Radiator 2
In the refrigerant pipe 28 connecting 0 and the low-temperature heat exchanger 24, a valve 13 for adjusting the flow rate of the refrigerant is provided.
Is provided. By adjusting the flow rate of the refrigerant toward the low temperature heat exchanger 24 with the valve 13, it is possible to prevent the liquid phase refrigerant inside the low temperature heat exchanger 24 from being drawn into the ejector pump 18.

The heat transfer means 26 is made of a material having high thermal conductivity, for example, a metal material such as aluminum or copper. The heat transfer means 26 is provided in contact with both the spatial light modulator 14 and the liquid-phase refrigerant inside the low-temperature heat exchanger 24. The heat generated in the spatial light modulator 14 is transmitted to the heat transfer means 26 and absorbed by the refrigerant in the low temperature heat exchanger 24, and the spatial light modulator 14 is cooled. Thereby, the deterioration of the spatial light modulator 14 due to the temperature rise can be prevented and the life of the projector 1 can be extended. In addition, you may improve cooling efficiency by using the part which contacts the refrigerant | coolant inside the low-temperature heat exchanger 24 among the heat-transfer means 26 as a fin structure.

Next, the flow of refrigerant circulation in the cooling system S1 will be described with reference to the flowchart of FIG.

The refrigerant flows out of the radiator 20 and travels toward the absorption evaporator 14 (step S1). The refrigerant that has flowed out of the radiator 20 evaporates in the absorption evaporator 14 (step S2). Absorption evaporator 1
When the refrigerant that has evaporated in 4 and has become a gas phase passes through the main nozzle 18a of the ejector pump 18 (step S3), the inside of the sub nozzle 18b is depressurized, and the inside of the low-temperature heat exchanger 24 is also depressurized (step S3) S4). A part of the refrigerant flowing out of the radiator 20 is accommodated inside the low-temperature heat exchanger 24, and a part of the accommodated refrigerant evaporates by depressurizing the inside of the low-temperature heat exchanger 24 to generate a refrigerant. Is cooled (step S5). The refrigerant evaporated in the low-temperature heat exchanger 24 into a vapor phase is drawn into the sub nozzle 18b and merges with the refrigerant passing through the main nozzle 18a (step S6). The refrigerant joined by the ejector pump 18 flows into the radiator 20 and is condensed by being absorbed by the outside air while passing through the flow path in the radiator 20 (step S7). The refrigerant condensed by the radiator 20 flows out again toward the absorption evaporator 14 (step S8).

As described above, the projector 1 according to this embodiment includes the absorption evaporator 1 that houses the light source device 3.
Since the outlet 14 a is formed at 4, it is easy to take out the light source device 3 from the projector 1. Therefore, when the light source device 3 reaches the end of its life, the light source device 3 can be easily replaced. Further, the light in the infrared region that passes through the reflector 8 and travels toward the outlet 14a is I
Since it is reflected toward the absorption evaporator 14 by the R reflecting mirror 12, it is possible to prevent the light in the infrared region from leaking from the outlet 14a. Therefore, the heat generated by the light in the infrared region transmitted through the reflector 8 can be efficiently absorbed by the absorption evaporator.

In addition, since the IR reflecting mirror 12 is integrally formed with the housing 10 and integrated with the light source device 3, the IR mirror 12 is also taken out when the light source device 3 is taken out. 12 does not get in the way. Therefore, the light source device 3 can be replaced more easily.

Further, since the IR mirror 12 is integrally formed with the housing 10, the IR mirror 12 can be made of the same material as the housing 10, and the manufacturing cost can be suppressed. Further, since the metal is deposited on the surface, even if the material of the housing 10 itself does not have the property of reflecting light in the infrared region, the IR mirror 12 can have the property of reflecting light in the infrared region.

The refrigerant cooled by the low-temperature heat exchanger 24 absorbs the heat generated by the spatial light modulator 14 to cool the spatial light modulator 14, thereby preventing the spatial light modulator 14 from deteriorating and extending the product life of the projector 1. Can be extended. In addition, the refrigerant is evaporated using the heat of the arc tube 4 that becomes very high temperature, and the refrigerant that has become a gas phase by evaporation is passed through the ejector pump 18.
The inside of the low-temperature heat exchanger 24 can be sufficiently depressurized. Since the inside of the low-temperature heat exchanger 24 is sufficiently depressurized, the evaporation temperature of the refrigerant accommodated therein can be lowered. If the evaporation temperature of the refrigerant is lowered, the refrigerant inside the low-temperature heat exchanger 24 can be sufficiently cooled even in an environment of about room temperature, and the temperature of the refrigerant can be reduced to room temperature or lower. Since the spatial light modulator 14 is cooled by the sufficiently cooled refrigerant, the cooling effect can be enhanced. Since the spatial light modulator 14 is cooled by absorbing heat in the refrigerant cooled by the low-temperature heat exchanger 24, the number of components can be reduced. Further, even when a fan for cooling the spatial light modulator 14 is provided, the spatial light modulator 14 can be cooled with a small air volume, so that the operation noise of the fan is suppressed and the silence of the projector 1 is suppressed. Can be improved.

Steam that passes through the main nozzle 18a of the ejector pump 18 that depressurizes the inside of the low-temperature heat exchanger 24 is generated by the heat energy that has been discarded by the arc tube 6, so a cooling device equipped with a compressor or the like can be used. Power consumption can be reduced compared to the case of using.

Further, the ejector pump 18 is easier to miniaturize than the compressor, and can contribute to the miniaturization of the cooling system S1 and the miniaturization of the projector 1.

In this embodiment, a transmissive liquid crystal display device is used as the spatial light modulator, but the present invention is not limited to this. As a spatial light modulator, a reflective liquid crystal display (Liquid Crystal On Silicon)
LCOS), DMD (Digital Micromirror Device), GLV (Grating Light Va)
lve) or the like may be used. When a reflective liquid crystal display device is used as the spatial light modulator,
You may comprise so that the heat-transfer means 26 may be made to contact the back side of the reflective surface of a reflection type liquid crystal display device, and the heat which generate | occur | produces in a reflection type liquid crystal display device may be radiated. Further, although the spatial light modulator 14 is the object to be cooled by the refrigerant cooled by the low-temperature heat exchanger 24, other heat sources provided in the projector 1, such as a polarizing plate and an electric circuit, may be the objects to be cooled.

In the present embodiment, the refrigerant evaporated by the absorption evaporator 14 as the light source heat absorption means is used in the main nozzle 18a of the ejector pump 18, but the invention is not limited to this. The sub-nozzle 18b can be depressurized by passing it through the main nozzle 18a of the ejector pump 18 in the liquid phase without evaporating the refrigerant with the light-absorbing means.

You may comprise so that the air which absorbed the heat | fever of the refrigerant | coolant with the radiator 20 flowed by the cooling fan 22 may be sprayed on the arc_tube | light_emitting_tube 6. FIG. For example, a duct (air passage) may be provided so that air that has been flowed by the cooling fan 22 is blown to the arc tube 6. Since the arc tube 6 has a very high temperature, the temperature difference from the arc tube 6 becomes large even if the temperature of the radiator 20 is increased by absorbing the heat of the refrigerant. 6 cooling can be performed. Further, since the radiator 20 and the arc tube 6 can be cooled by the single cooling fan 22, the projector 1 can be reduced in size and parts compared to the case where fans for cooling the radiator 20 and the arc tube 6 are provided. This can contribute to a reduction in the number of points and a reduction in manufacturing costs. Moreover, quietness can be improved as compared with the case where a plurality of fans are provided. Further, the cooling fan 22 may also serve as another fan that is conventionally disposed in the projector, for example, a fan for cooling the power supply or a fan for discharging the air in the projector housing.

A capillary tube may be provided instead of the valve 13. The inside of the capillary tube is a capillary tube, and an amount of the refrigerant according to the pressure difference between the inflow side and the outflow side of the refrigerant with respect to the capillary tube passes. Therefore, an appropriate amount of refrigerant can be introduced into the low-temperature heat exchanger 24 without providing the valve 13 for adjusting the flow rate of the refrigerant between the radiator 20 and the low-temperature heat exchanger 24. Since the valve 13 is unnecessary, it is possible to contribute to the reduction of the number of parts and the miniaturization of the projector 1.

Further, the means for absorbing the heat generated in the spatial light modulator 4 by the refrigerant in the low-temperature heat exchanger 24 is not limited to the case where the heat transfer means 26 is used. For example, the refrigerant generated in the spatial light modulator 4 is absorbed by a refrigerant different from the refrigerant in the low-temperature heat exchanger 24, and the refrigerant of the different system is placed in a pipe disposed in the low-temperature heat exchanger 24. By letting it pass, the heat generated in the light source device 4 may be absorbed by the refrigerant in the low-temperature heat exchanger. Alternatively, the spatial light modulator and the low temperature heat exchanger may be brought into direct contact.

Further, the projector 1 is not limited to the configuration including the spatial light modulation device 4 for each color light. The projector 1 may be configured to modulate two or three or more color lights with one spatial light modulator 4. Further, the projector 1 may be a so-called rear projector that supplies light to one surface of the screen and observes an image by observing light emitted from the other surface of the screen.

FIG. 7 is a diagram for explaining the attachment position of the IR mirror according to the first modification of the present embodiment.
The same parts as those in the above-described configuration are denoted by the same reference numerals, and redundant description is omitted.

In the first modification, the IR mirror 12 is attached to the lid 50b, and the IR mirror 12 and the lid 50b are integrated. Since the IR mirror 12 is provided integrally with the lid portion 50b that closes the outlet 14a, the IR reflection mirror 12 is also removed together when the lid portion 50b is removed when the light source device 3 is taken out. Therefore, the state of the light source device 3 accommodated in the absorption evaporator 14 can be confirmed by simply removing the cover 50b without being obstructed by the IR reflecting mirror 12. Moreover, since the IR mirror 12 is provided separately from the light source device 3, the cost of the light source device 3 itself can be suppressed. Thereby, the replacement cost of the light source device 3 can be suppressed.

1 is a diagram showing a schematic configuration of a projector according to an embodiment of the invention. The external appearance perspective view of a light source device. The external appearance perspective view of an absorption evaporator. The external appearance perspective view which shows the state in which the light source device was accommodated in the absorption evaporator. The cross-sectional view which shows the state in which the light source device was accommodated in the absorption evaporator. The flowchart for demonstrating the flow of the circulation of the refrigerant | coolant in a cooling system. The figure for demonstrating the attachment position of IR mirror which concerns on the modification 1 of a present Example.

Explanation of symbols

S1 Cooling system, 1 projector, 3 light source device, 4 spatial light modulator (optical element), 6 arc tube (light emitting part), 8 reflector (first reflecting means), 10 housing, 12
IR reflection mirror (second reflection means), 13 bulb, 14 absorption evaporator (light absorption means for light source), 14a outlet, 14b refrigerant flow path, 16 circulation pump, 18 ejector pump, 18a main nozzle, 18b sub nozzle, 18c Communication hole, 20 Radiator (radiator), 22 Cooling fan, 24 Low temperature heat exchanger (evaporator), 26 Heat transfer means, 28 Refrigerant tube, 48 Projection lens, 50 Housing, 50a Light source housing, 50b Lid

Claims (10)

In the projector of organic light emitting unit that emits light, a part of the light emitted from the light emitting portion is reflected in a predetermined direction, and a first reflecting means that transmits the light in the infrared region, a light source device comprising a There,
Houses a pre-Symbol light source device, and the predetermined outlet that allows taking out the light source device in a direction different direction is formed, a light source for endothermic device for endothermic heat from the light source device,
A second reflecting means for reflecting the light in the infrared region that passes through the first reflecting means and travels toward the outlet, toward the heat absorbing means for the light source;
An ejector pump for passing a refrigerant that has absorbed heat from the light source device;
A radiator that dissipates the heat of the refrigerant that has flowed out of the ejector pump;
An evaporator that evaporates and cools the stored refrigerant, and
The projector according to claim 1, wherein the ejector pump decompresses the interior of the evaporator by a pressure drop caused by the passage of the refrigerant that has absorbed heat by the light-absorbing means for light source . The projector according to claim 1,
The projector according to claim 1, wherein the second reflecting means is provided integrally with the light source device. The projector according to claim 2,
A housing that constitutes an outline of the light source device;
Said second reflecting means is integrally molded into the housing, a projector, wherein a metal on the surface of light of at least the infrared region is irradiated is deposited. The projector according to claim 1,
Further comprising a lid for closing said outlet,
The projector according to claim 1, wherein the second reflecting means is provided integrally with the lid. The projector according to any one of claims 1 to 4,
The light source heat absorbing means has projections and depressions on at least a part of an inner wall surface on the side where the first reflecting means is disposed . The projector according to any one of claims 1 to 5,
  The projector, wherein the evaporator absorbs heat from a heat source other than the light source device by a cooled refrigerant. The projector according to any one of claims 1 to 6,
A projector characterized by evaporating a refrigerant in the light-absorbing means for light source. The projector according to claim 6,
The projector, wherein the heat source is an optical element that modulates light emitted from the light emitting unit. A projector according to claim 7, wherein
The refrigerant evaporated by the heat absorbing means for the light source and passed through the ejector pump is cooled and condensed by the radiator.
A part of the refrigerant cooled by the radiator is accommodated in the evaporator. A projector according to any one of claims 1 to 9,
The projector according to claim 1, wherein the heat absorbing means for light source has a surface having an emissivity of 0.8 or more on at least a part of an inner wall surface on the side where the first reflecting means is disposed.

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