JP2012230333A - Projection picture display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection picture display that realizes emission of cooling air from a side to optical components constituting a light modulating device.SOLUTION: A projection picture display relating to the invention comprises light modulating devices (specifically, liquid crystal light valves 20, 30 and 40), a photosynthesis device (specifically, a cross dichroic prism 50) and a projection lens 60. The display is provided with: multiple cooling air outlets 72 for emitting the cooling air along each surface of optical components constituting the light modulating devices; a cooling fan 71 for sending the cooling air; and an air duct 73 for connecting the cooling fan 71 with the cooling air outlets 72. And, with respect to at least one of the light modulating devices, the cooling air outlets 72 are formed on a side of the light modulating device so as to horizontally emit the cooling air to a range to be cooled on each surface of the optical components.

Description

  The present invention relates to a projection display apparatus, and more particularly to a cooling apparatus that cools optical components with cooling air.

  In general, the projection type image display apparatus cools an optical component such as a liquid crystal panel or a polarizing plate by blowing cooling air along the surface of an optical component that increases in temperature during image display operation. The cooling air can be blown by blowing the cooling air from the vertical direction, for example from below, on an optical component when the projection display is installed upright on a flat floor or desk. And there were some which blow cooling air from the side. As the former, there is, for example, Patent Document 1, and as the latter, there is, for example, Patent Document 2.

JP 2010-61004 A JP 2009-150975 A

  By the way, the high temperature portion on the surface of the optical component, that is, the range to be cooled, is a rectangular range having a horizontally and vertically long aspect from the center of the optical component through which emitted light such as a lamp passes. For this reason, in the case where the cooling air is blown out in the vertical direction as described in Patent Document 1, the cooling air blowing width viewed from the direction of the air is cooled to the side as described in Patent Document 2. Larger than the one that blows out the wind. For this reason, when trying to increase the blown-out air speed in order to increase the cooling capacity in response to the improvement in illuminance, the former one has to have a larger air volume than the latter, and the cooling air is blown. There were problems such as an increase in the size of the cooling fan and an increase in power consumption.

  On the other hand, if the latter is used, the cooling air blowing width can be made smaller than that of the former, so that there is an advantage that it is not necessary to increase the air volume as the former. However, in the latter case, since the cooling fan outlet is directly connected to the cooling air outlet, it is difficult to adjust the cooling fan outlet and the cooling air outlet for the optical component. Since it must be arranged beside the lens, there is a problem that it is difficult to take a space for arranging the cooling fan, and it is difficult to put it to practical use.

  The present invention has been made in view of such problems, and provides a projection display apparatus that can realistically blow cooling air from the side to optical components constituting the light modulation device. For the purpose.

  According to a first aspect of the present invention, there is provided a projection display apparatus for combining a plurality of light modulation devices that respectively modulate a plurality of color lights in accordance with image information and the color lights from the plurality of light modulation devices. A light synthesizing device, a projection lens for enlarging and projecting the light synthesized by the light synthesizing device, a plurality of cooling air outlets for blowing cooling air along the surface of the optical component constituting the light modulation device, and the optical component A cooling fan for blowing cooling air, and an air duct connecting the outlet of the cooling fan and the cooling air outlet, for at least one of the plurality of light modulators, A cooling air outlet is formed on the side of the light modulator so that the cooling air can be blown out horizontally toward the area to be cooled on the surface of the optical component.

  According to the above configuration, at least one light modulation device among the plurality of light modulation devices is configured to blow the cooling air so that the cooling air can be blown horizontally toward the area to be cooled on the surface of the optical component. Since the outlet is formed on the side of the light modulation device, it is possible to obtain blown air having a higher wind speed than when cooling air is blown in the vertical direction. Therefore, for at least one light modulation device, an increase in the size of the cooling fan and an increase in power consumption can be suppressed even if the blowing air speed from the cooling air outlet is increased. In addition, since the cooling fan and the cooling air outlet to the optical component are connected by an air duct, the cooling fan can be connected to the upper, lower or side of the optical system by changing the shape and arrangement of the air duct. The projector can be installed at a position and orientation that match the structure inside the housing of the projection display apparatus. In addition, since the cooling fan and the cooling air outlet to the optical component are connected by an air duct, the air outlet of the cooling fan can be easily changed to the cooling air outlet by changing the shape of the air duct. Since it can match, the ventilation resistance of the cooling air from a cooling fan can be reduced.

  According to a second aspect of the present invention, in the projection display apparatus according to the first aspect, each of the light modulation devices is configured such that cooling air is supplied from an individual cooling fan through an air duct. It is characterized by being.

  According to the above configuration, since the cooling fan is provided for each light modulation device, the cooling air volume of the cooling fan can be easily adjusted for each light modulation device. In addition, a cooling fan is provided for each light modulation device, and these cooling fans are connected by an air duct, so that each cooling fan can be reduced in size, and cooling can be performed by effectively using an empty space in the housing. It becomes easy to install the fan.

  According to a third aspect of the present invention, in the projection display apparatus according to the first or second aspect, at least one of the plurality of light modulation devices should be cooled on the surface of the optical component. The cooling air outlet is formed on the side of the light modulation device so that the cooling air can be blown horizontally toward the range, and at least one light modulation device of the plurality of light modulation devices, The cooling air outlet is formed above or below the light modulator so that the cooling air can be blown out vertically toward the area to be cooled on the surface of the optical component.

  According to the above configuration, the light modulation member can be cooled by properly using the horizontal blowing from the side and the vertical blowing from above or below, so that the layout design of the cooling fan, the air duct, the exhaust passage, etc. Can have a degree of freedom.

  According to a fourth aspect of the present invention, in the projection display apparatus according to the first or second aspect, the light modulation device includes liquid crystal light valves for red light, green light, and blue light. The light synthesizer is a cross dichroic prism, and the light modulator is disposed in a U-shape so as to face the light incident surface of the cross dichroic prism. A vertical duct portion in which an outlet is formed is arranged, and cooling air is blown in a horizontal direction toward a range to be cooled on the surface of the optical component constituting each light modulation device. And

  According to the said structure, a cooling wind blower outlet can be provided using the empty space of the corner part between the optical modulation apparatuses arrange | positioned at a U-shape. Therefore, the space can be effectively used. In addition, since the cooling air is blown in the horizontal direction along the surfaces of the optical components constituting all the light modulation devices, the amount of blowing air suppressed is large, and the saving effect is increased.

  According to a fifth aspect of the present invention, in the projection display apparatus according to any one of the first to fourth aspects, the light modulator is a liquid crystal light valve for red light, green light, or blue light. The light combining device is a cross dichroic prism, the light modulation device is arranged in a U shape so as to face the light incident surface of the cross dichroic prism, and further, the light in the projection lens In one of the light modulation devices arranged in a direction parallel to the axis, the cooling air is blown horizontally from the cooling air outlet toward the area to be cooled on the surface of the optical component, and the optical component After being cooled, the projection lens is formed so as to be exhausted to the outside of the casing of the projection display apparatus from an exhaust port provided on the side of the projection lens.

  According to the above configuration, one of the light modulation devices arranged in a direction parallel to the optical axis of the projection lens is such that cooling air is blown in the horizontal direction and directed toward the external space on the side of the projection lens. Therefore, the air flow resistance can be reduced because the air can be exhausted in a horizontal flow. Further, since the heated exhaust air after cooling the optical components is exhausted to the projection lens side where the user is unlikely to be located, the user's discomfort due to the exhaust air can be alleviated. In addition, the heated exhaust air after cooling the optical components is exhausted directly from the exhaust port provided on the side of the projection lens to the outside of the housing of the projection display apparatus, so that no exhaust fan is provided. It becomes possible to exhaust the air.

  According to a sixth aspect of the present invention, in the projection display apparatus according to any one of the first to fourth aspects, the light modulator is a liquid crystal light valve for red light, green light, or blue light. The light combining device is a cross dichroic prism, and the light modulation device is disposed in a U shape so as to face the light incident surface of the cross dichroic prism, and the optical axis of the projection lens In each of the two light modulation devices arranged in the parallel direction, the cooling air is blown in the horizontal direction from the cooling air outlet toward the area to be cooled on the surface of the optical component, and after cooling the optical component, An exhaust port provided on the side of the projection lens is formed so as to be exhausted to the outside of the casing of the projection display apparatus.

  According to the above configuration, each light modulation device arranged in a direction parallel to the projection lens is exhausted while cooling air is blown in the horizontal direction and the horizontal flow toward the external space beside the projection lens. Therefore, the ventilation resistance can be reduced. Further, since the heated exhaust air after cooling the optical components is exhausted to the projection lens side where the user is unlikely to be located, the user's discomfort due to the exhaust air can be alleviated. In addition, the heated exhaust air after cooling the optical components is exhausted directly from the exhaust port provided on the side of the projection lens to the outside of the housing of the projection display apparatus, so that no exhaust fan is provided. It becomes possible to exhaust the air.

  According to a seventh aspect of the present invention, in the projection display apparatus according to the fifth or sixth aspect, the exhaust port on the side of the projection lens is inclined so that the exhaust air is directed away from the projection lens. It is characterized by being exhausted.

  According to the above configuration, the exhaust air is exhausted in a direction away from the projection lens, so that adverse effects on the projected image due to hot air can be avoided.

According to the projection display apparatus of the present invention, for at least one light modulation device,
The cooling air outlet is formed on the side of the light modulator so that the cooling air can be blown out horizontally toward the area to be cooled on the surface of the optical component. Can be suppressed. In addition, since the cooling fan and the air outlet to the light modulation device are connected by a blower duct, the installation location of the cooling fan can be set elastically, and the air outlet of the cooling fan is connected to the light modulation device. It is possible to align with the cooling air outlet of the air without difficulty, and the ventilation resistance by the duct can be reduced.

1 is a schematic diagram of an optical system of a projection display apparatus according to Embodiment 1 of the present invention. It is a conceptual diagram of the cooling system of the light modulation device in the projection display apparatus. It is a schematic diagram which shows the connection state of the cooling fan in the cooling system. It is a cooling system conceptual diagram of the light modulation device in the projection display apparatus according to Embodiment 2 of the present invention. It is a cooling system conceptual diagram of the light modulation device in the projection display apparatus according to Embodiment 3 of the present invention.

(Embodiment 1)
Hereinafter, a projection display apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. In the following description, when referring to the up / down / left / right direction or the front / rear direction, the projection lens side is the front when the projection display apparatus is installed in an upright projection installation on a flat floor surface, a desk surface, etc. The vertical and horizontal directions are assumed. When this direction is applied to FIG. 1, the left-right direction on the paper surface of FIG. 1 is the left-right direction, and the direction perpendicular to the paper surface of FIG. 1 is the vertical direction. Note that the front side of the page is the upper side.

  The projection display apparatus according to the present embodiment is a so-called three-plate liquid crystal projector that uses a liquid crystal light valve as an optical element that modulates red light, green light, and blue light according to image information. As such, discharge lamps such as metal halide lamps and ultra-high pressure mercury lamps are used as light emitters.

  The light emitted from the light source 1 is emitted as parallel light by the reflector, and enters the first dichroic mirror 10 through the integrator lens 2, the polarization conversion device 3, the condenser lens 4, the reflection mirror 5, and the relay lens 6. Is done. The integrator lens 2 is composed of a pair of lens groups (fly eye lenses), and each lens portion guides light emitted from the light source 1 to the entire surface of liquid crystal light valves 20, 30, and 40 as light modulation devices to be described later. It is configured as follows. Thereby, partial luminance unevenness existing in the light emitted from the light source 1 is averaged, and a light amount difference between the center of the screen and the peripheral portion is reduced.

  The first dichroic mirror 10 transmits a red light component and reflects and separates a green light component and a blue light component. The red light component is guided to the red light liquid crystal light valve 20 through the reflection mirror 11 and the condenser lens 12, and the separated green light component and blue light component are reflected by the second dichroic mirror 13 and the green light component is reflected. The blue light component is transmitted and separated. The green light component is guided to the liquid crystal light valve 30 for green light through the condenser lens 14. The blue light component separated by the dichroic mirror 13 is guided to the blue light liquid crystal light valve 40 through the relay lens 15, the reflection mirror 16, the relay lens 17, the reflection mirror 18, and the condenser lens 19.

  The liquid crystal light valves 20, 30, and 40 for red light, green light, and blue light are respectively incident pre-polarizing plates (inorganic polarizing plates) 21, 31, 41, incident polarizing plates 22, 32, 42, and liquid crystals. It is composed of optical parts such as panels 23, 33, 43 and outgoing polarizing plates 24, 34, 44. The incident pre-polarizers 21, 31, 41 are elliptically polarized light beams reaching the liquid crystal light valve 30, and are thus polarized into linearly polarized light in a certain direction. The incident polarizing plates 22, 32, and 42 allow only polarized light in a certain direction to pass through, and by the cooperative action with the outgoing polarizing plates 24, 34, and 44 that form a pair with the incident polarizing plates 22, 32, and 42. The liquid crystal panels 23, 33, 43 act so as to pass only polarized light in a certain direction modulated. The liquid crystal panels 23, 33, and 43 modulate incident light beams of respective color lights based on image signals.

  Further, these liquid crystal light valves 20, 30, 40 are arranged in a cono-shape so as to face the incident surface of a cross dichroic prism 50 as a photosynthesis device. Then, the red light, the green light, and the blue light modulated by the liquid crystal light valves 20, 30, and 40 are combined by the cross dichroic prism 50 and projected from the surface on which the liquid crystal light valves 20, 30, and 40 are not disposed. The light is emitted to the lens 60.

  In a liquid crystal projector provided with such an optical system, a cooling system for cooling these optical components by blowing cooling air into the gaps between the optical components constituting the liquid crystal light valves 20, 30, 40 is shown in FIGS. As shown in FIG. FIG. 3 is an example of a schematic diagram showing a cooling fan connection state in the cooling system. In this figure, the cooling system for cooling the liquid crystal light valve 40 for blue light is shown, but the liquid crystal light for red light is shown. The same applies to the cooling system for the bulb 20 and the liquid crystal light bulb 30 for green light. In the following description, FIG. 3 will be generally described as a representative drawing.

  For example, as shown in FIG. 3, a sirocco fan suitable for duct connection is used as the cooling fan 71 that blows cooling air to the optical components constituting the liquid crystal light valves 20, 30, and 40. For the cooling fan 71, an appropriate place as an equipment arrangement including other equipment, for example, an appropriate space such as a lower part, an upper part, a side part, or the like of the optical system is selected. As shown in the example of FIG. 3, the air outlet 71 a of the cooling fan 71 and the cooling air outlet 72 to the liquid crystal light valves 20, 30, 40 are connected by an air duct 73. As described above, the cooling fan 71 and the air duct 73 for blowing the cooling air are provided for the liquid crystal light valves 20, 30, and 40 for each color light. In general, the air outlet 71a of the cooling fan 71 has a shape and a size different from those of the cooling air outlet 72 to the liquid crystal light valves 20, 30, and 40. In general, the air outlet 71a of the cooling fan 71 is better. large. Therefore, the air duct 73 is set so that the cross-sectional shape of the air duct 73 is corrected toward the air blowing direction so that the shape and size of the air outlet 71a of the cooling fan 71 are matched with the cooling air air outlet 72. Has been.

  The cooling air outlet 72 to the liquid crystal light valves 20, 30, 40 is along the surface of the optical component with respect to the light transmission portion in the optical components constituting the liquid crystal light valve 20, 30, 40, that is, the range to be cooled. Since the cooling air may be blown, the center position thereof is matched with the center position of the light transmitting portion of the optical component. The dimension in the height direction of the cooling air outlet 72 may be a little larger than the height of the light transmission portion in the optical component, and is much smaller than the height of the optical component. In addition, the cooling air outlet 72 to the liquid crystal light valves 20, 30, 40 is provided in an empty space outside the four corners of the cross dichroic prism 50 in this embodiment. In this empty space, first, a vertical duct portion 73a that extends in the vertical direction and forms a part of the air duct 73 is disposed. Further, a liquid crystal light valve to be cooled by the cooling air outlet 72 is provided above the vertical duct portion 73a. It is formed so as to protrude to the side of 20, 30, 40 (the liquid crystal light valve 40 for blue light in FIG. 3).

  In the case of this embodiment, the four corner vertical duct portions 73a are arranged at the left front position, the left rear position, and the right rear position. Of these, the vertical duct portion 73a arranged at the left front position is formed with a cooling air outlet 72 for blowing cooling air toward the rear direction 75r in order to cool the optical components of the liquid crystal light valve 20 for red light. ing. Further, a cooling air outlet 72 for blowing cooling air toward the right direction 75g is formed in the vertical duct portion 73a arranged at the left rear position in order to cool the optical components of the liquid crystal light valve 30 for green light. ing. In addition, a cooling air outlet 72 for blowing cooling air toward the front direction 75b is formed in the vertical duct portion 73a arranged at the right rear position in order to cool the optical components of the liquid crystal light valve 40 for blue light. ing.

  Further, the portion where the liquid crystal light valves 20, 30, 40, the cross dichroic prism 50 and the vertical duct portion 73a are arranged, that is, the peripheral portion of the liquid crystal light valve is a side wall that surrounds four sides, a bottom wall that forms a bottom surface, and a top surface. Is surrounded by a partition wall 76 made of a top wall. Further, the side wall of the partition wall 76 is formed with a portion that transmits light. Further, condenser lenses 12, 14, and 19 for light of each color are disposed on the side of the partition wall 76 through which light passes. As described above, the liquid crystal light valve peripheral portion is partitioned by the partition wall 76 on the side surface, the top surface, and the bottom surface by the wall body. Further, although not shown in the top wall above the vertical duct portion 73a at the left rear position, an exhaust port for exhausting the cooling air that has passed through the liquid crystal light valve 20 for red light in the horizontal direction upward ( (Not shown) is formed. Similarly, although not shown in the top wall above the vertical duct portion 73a at the right rear position, an exhaust port for exhausting the cooling air that has passed through the liquid crystal light valve for green light in the horizontal direction upward ( (Not shown) is formed. Further, an exhaust port 77 is formed on the right side of the front projection lens 60 to exhaust the cooling air that has passed through the liquid crystal light valve 40 for blue light in the horizontal direction forward.

  The exhaust port 77 directly exhausts the exhaust air heated by cooling the optical components constituting the liquid crystal light valve 40 for blue light directly to the outside of the casing A of the projection display apparatus, and is projected. A guide 77a is provided so as to be exhausted in an oblique direction 77b away from the lens 60.

In the projection display apparatus configured as described above, the optical components constituting the liquid crystal light valves 20, 30, and 40 as the light modulator are cooled as follows.
When the projection operation is started, transmission of the light emitted from the light source 1 raises the temperature of the light transmission portion of the optical component constituting the liquid crystal light valve 20, 30, 40, that is, the range to be cooled. The cooling system for the optical parts constituting the liquid crystal light valves 20, 30, 40 for each color light in the projection display apparatus prevents overheating of the optical parts. Each cooling fan 71 for supplying cooling air is operated as the projection operation starts. Thereby, the cooling air blown out from each cooling fan 71 is conveyed to the cooling air outlet 72 provided on the side of each liquid crystal light valve 20, 30, 40 by the air duct 73, and horizontally from the cooling air outlet 72. Blown out.

  Further, in this case, the cooling air outlet 72 is horizontal along the surface of the optical component with respect to a light transmitting portion that becomes a high temperature in the optical components constituting the liquid crystal light valves 20, 30, 40, that is, a range to be cooled. The cooling air is blown out in the direction. For this reason, the center position of the cooling air outlet 72 is provided so as to coincide with the center position of the light transmission portion in the optical component. Further, the dimension in the height direction of the cooling air outlet 72 is set to be slightly larger than the height of the light transmission portion in the optical component.

  The reason why the cooling air is blown out in the horizontal direction with respect to the temperature rising portion on the surface of the optical component is to obtain a high blowing air speed. That is, the light transmission range in the optical component is a rectangle having a horizontally long aspect ratio. For this reason, the blowing width of the cooling air that spreads in the vertical direction is smaller than the blowing width of the cooling air that spreads in the horizontal direction when the cooling air is blown out in the vertical direction. Therefore, if the cooling air is blown out in the horizontal direction, a high wind speed can be obtained.

  In this case, the cooling air outlet 72 is formed in the upper part of the vertical duct portion 73a so as to use an empty space on the side of each liquid crystal light valve 20, 30, 40. Further, since the air duct 73 is smoothly changed in cross-sectional area so that the cross-sectional shape is gradually changed from the air outlet 71a of the cooling fan 71 to be matched with the cooling air outlet 72, the ventilation resistance is reduced. It is configured as follows.

  The optical components constituting the red light liquid crystal light valve 20 are cooled by the cooling air blown in the horizontal direction from the cooling air outlet 72 formed in the vertical duct portion 73a at the left front position toward the rear direction 75r. Is done. This cooling air is blown out along the surfaces of a plurality of optical components constituting the liquid crystal light valve 20 for red light, and after these optical components are cooled, they are opened in the top wall above the vertical duct portion 73a at the left rear position. The discharged opening (not shown) is discharged into the space in the casing A of the projection display apparatus existing outside the partition wall.

  Further, the optical components constituting the liquid crystal light valve 30 for green light are cooled by cooling air blown in the horizontal direction from the cooling air outlet 72 formed in the vertical duct portion 73a at the left rear position toward the right direction 75g. Is done. This cooling air is blown out along the surfaces of a plurality of optical components constituting the liquid crystal light valve 30 for green light, and after cooling these optical components, an opening is made in the top wall above the vertical duct portion 73a at the right rear position. The discharged opening (not shown) is discharged outside the partition wall in the housing A of the projection display apparatus.

  The cooling air after cooling the liquid crystal light valve 20 for red light and the cooling air after cooling the liquid crystal light valve 30 for green light are discharged into the housing A, and then the exhaust fan (non- The power source and the light source 1 are cooled and heated together with the heated air.

  The optical components constituting the liquid crystal light valve 40 for blue light are cooled by cooling air blown in the horizontal direction from the cooling air outlet 72 formed in the vertical duct portion 73a at the right rear position toward the front direction 75b. Is done. This cooling air is blown out along the surfaces of a plurality of optical components constituting the liquid crystal light valve 40 for blue light, and after cooling these optical components, from the exhaust port 77 opened on the right front surface of the projection lens 60. It is exhausted directly outside the machine. Therefore, in the case of this exhaust, unlike the case where the other liquid crystal light valves 20 and 30 are cooled, the casing A can be directly connected from the partition wall 76 without going through the casing A of the projection display apparatus. Since the air is exhausted to the outside, the air can be exhausted without using an exhaust fan (not shown).

  Further, when high-temperature air exhausted from the exhaust port 77 drifts in the vicinity of the projection lens, the air whose density has been reduced due to the temperature rise is mixed with the air in the portion through which the projection light passes, so that the air around the projection lens. The refractive index of the light changes. When this happens, the light refractive index in the air through which the projection light passes changes partially, and the image may be disturbed. Therefore, in order to avoid such a phenomenon, a guide 77a is provided at the exhaust port 77, and the exhaust air heated by cooling the liquid crystal light valve 40 for blue light moves away from the projection lens 60, that is, an oblique direction. It is configured to exhaust to the outside toward 77b (in this case, diagonally to the right).

Since the projection display apparatus according to Embodiment 1 is configured as described above, the following effects can be achieved.
(1) The cooling air outlet 72 is located to the side of the liquid crystal light valves 20, 30, 40 as the light modulator so that the cooling air can be blown out horizontally toward the area to be cooled on the surface of the optical component. Since it is formed, it is possible to obtain blown air having a higher wind speed than when cooling air is blown in the vertical direction. Therefore, even if the blowing air speed from the cooling air outlet 72 is increased, the size of the cooling fan 71 and the increase in power consumption can be suppressed.

  (2) Since the cooling fan 71 and the cooling air outlet 72 to the optical component are connected by the air duct 73, the shape and arrangement of the air duct 73 are changed so that the cooling fan 71 is placed above the optical device. It can be installed at a position and orientation that match the structure in the housing A of the projection display apparatus, such as the lower part or the side part.

  (3) Further, since the cooling fan 71 and the cooling air outlet 72 to the optical component are connected by the air duct 73, the air blow duct 73 can be blown by changing the shape of the air duct 73 halfway. Since the outlet 71a can be reasonably aligned with the cooling air outlet 72, the blowing resistance of the cooling air from the cooling fan 71 can be reduced.

  (4) Since each liquid crystal light valve 20, 30, 40 is configured such that cooling air is supplied from the individual cooling fan 71 via the air duct 73, each liquid crystal light valve 20, 30, 40 is provided. It is possible to easily adjust the cooling air flow with respect to.

  (5) Each of the liquid crystal light valves 20, 30, 40 is provided with a cooling fan, and since these cooling fans 71 are connected by the air duct 73, each cooling fan 71 can be reduced in size and the casing A It becomes easy to attach each cooling fan 71 by effectively using the empty space inside.

  (6) The liquid crystal light valves 20, 30, 40 are arranged in a U shape so as to face the light incident surface of the cross dichroic prism 50, and cooling air is blown to the side of the liquid crystal light valves 20, 30, 40. A vertical duct portion 73a in which an outlet 72 is formed is disposed. Therefore, the empty space between the liquid crystal light valves 20, 30, 40 can be used effectively.

  (7) In cooling the liquid crystal light valve 40 for blue light, after the cooling air blown in the horizontal direction from the cooling air outlet 72 toward the front direction 75b cools the optical components constituting the liquid crystal light valve 40, An exhaust port 77 provided on the side of the projection lens 60 is formed so as to be exhausted directly to the outside of the casing A of the projection display apparatus. Therefore, since the cooling air is exhausted with the horizontal flow, the ventilation resistance can be reduced. Further, since the exhaust is discharged to the projection lens 60 side where the user is unlikely to be located, it is possible to alleviate discomfort to the user due to the exhaust air. Further, since the air is exhausted directly from the exhaust port 77 provided on the right side of the projection lens 60 to the outside of the casing A of the projection display apparatus, the exhaust can be performed without providing an exhaust fan.

  (8) Since the exhaust port 77 on the right side of the projection lens 60 is exhausted in the oblique direction 77b so that the exhaust air is directed away from the projection lens 60, adverse effects on the projected image due to hot air can be avoided.

(Embodiment 2)
Next, the second embodiment will be described with reference to FIG.
In this embodiment, the method of blowing cooling air to the liquid crystal light valve 20 for red light and the liquid crystal light valve 30 for green light is changed in the first embodiment. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The cooling air outlet 72 for blowing out the cooling air to the red light liquid crystal light valve 20 is located above the vertical duct portion 73a disposed at the corner portion at the left rear position, and directed toward the red light liquid crystal light valve 20. The cooling air is blown horizontally. The cooling air is blown out in the horizontal direction from the cooling air outlet 72 toward the front direction 81r. An exhaust port 82 is formed on the left side of the front projection lens 60 to exhaust the cooling air that has passed through the liquid crystal light valve 20 for red light in the horizontal direction forward.

  In the exhaust port 82, the exhaust air heated by cooling the optical components constituting the liquid crystal light valve 20 for red light is directly exhausted to the outside of the casing A of the projection display apparatus, A guide 82a is provided so as to be exhausted in an oblique direction 82b away from the projection lens 60.

  On the other hand, the cooling air for the liquid crystal light valve 30 for green light is blown upward from a cooling air outlet 83 provided on the bottom wall of the partition wall 76 in the same manner as a conventional one, and above the partition wall 76. It is configured to be discharged into the housing A from a discharge port (not shown) provided on the top wall. The blowing of cooling air to the liquid crystal light valve 40 for blue light is the same as that in the first embodiment.

Since the second embodiment is configured as described above, the optical components constituting the liquid crystal light valves 20, 30, and 40 are cooled as follows.
The optical components constituting the liquid crystal light valve 20 for red light are blown horizontally from the cooling air outlet 72 attached to the vertical duct portion 73a disposed at the left rear position in the forward direction 81r. The blowing width of the cooling air from the cooling air outlet 72 is set to be slightly larger than the height of the light transmitting portion that is a high temperature in the optical component, that is, the range to be cooled. The cooling air cools the optical components constituting the liquid crystal light valve 20 for red light, and is then exhausted directly from the exhaust port 82 opened on the left front surface of the projection lens 60 to the outside of the apparatus. Therefore, in the case of this exhaust, the exhaust fan (not shown) is used because it is exhausted directly from the partition wall 76 to the outside of the casing A without passing through the casing A of the projection display apparatus. It can exhaust without.

  Further, when high-temperature air exhausted from the exhaust port 82 drifts in the vicinity of the projection lens 60, the exhaust gas heated by cooling the liquid crystal light valve 40 for blue light is exhausted from the exhaust port 77 on the right side. A guide 82a is provided at the exhaust port 82 for the same reason as preventing the image from being disturbed. As a result, the exhaust air heated by cooling the liquid crystal light valve 20 for red light is exhausted directly to the outside in the direction away from the projection lens 60, that is, in the oblique direction 82b (in this case, the left oblique direction). It is configured as follows.

  On the other hand, the cooling in the liquid crystal light valve 30 for green light is cooled by the cooling air blown upward in the vertical direction from the cooling air outlet 83 provided on the bottom wall of the partition wall 76. The blowing width of the cooling air from the cooling air outlet 83 is set to be slightly larger than the horizontal length of the high temperature portion of the optical component, that is, the light transmitting portion. The cooling air cools the optical components constituting the liquid crystal light valve 30 for green light, and is then discharged into the housing A from an outlet (not shown) formed in the top wall of the partition wall 76. . The cooling air discharged into the housing A is discharged outside the apparatus together with air heated by cooling the power source and the light source 1 by an exhaust fan (not shown).

  Since the projection display apparatus according to the present embodiment is configured as described above, it is the same as the effects (2) to (5), (7), and (8) according to the first embodiment. The effect of can be produced. In addition to this, the following effects can be obtained.

  (9) The optical components of the liquid crystal light valve 20 for red light and the liquid crystal light valve 40 for blue light are cooled by a vertical duct portion 73a disposed at the left rear position and a vertical duct portion 73a disposed at the right rear position. The cooling air is cooled by the cooling air blown out in the horizontal direction and forwardly 81r, 75b from the cooling air outlet 72 attached to the head. Therefore, with respect to the cooling of the liquid crystal light valves 20 and 40, it is possible to obtain a blown air having a higher wind speed than when the cooling air is blown in the vertical direction, and to increase the blowing air speed from the cooling air outlet 72. However, an increase in the size of the cooling fan 71 and an increase in power consumption can be suppressed.

  (10) The cooling of the optical component of the green light liquid crystal light valve 30 is performed so that the cooling air is blown in the vertical direction from below to above toward the range to be cooled on the surface of the optical component. Therefore, this arrangement can be adopted when this is preferable for layout design due to the arrangement of the internal devices.

  (11) The liquid crystal light valves 20, 30, and 40 are arranged in a U shape so as to face the light incident surface of the cross dichroic prism 50, and the liquid crystal light valve 20 for red light and the liquid crystal light for green light are arranged. A vertical duct portion 73a for red light is disposed at a corner portion between the bulb 30 and the bulb 30. A vertical duct portion 73a for blue light is disposed at a corner portion between the liquid crystal light valve 30 for green light and the liquid crystal light valve 40 for blue light. Accordingly, the cooling air outlet 72 for horizontal blowing is formed by effectively using the empty space between the liquid crystal light valves 20, 30 and 40.

  (12) In cooling the liquid crystal light valve 20 for red light, the cooling air blown in the horizontal direction from the cooling air outlet 72 cools the optical components constituting the liquid crystal light valve 20, and then the left side of the projection lens 60. It is formed so as to be directly exhausted to the outside of the casing A of the projection display apparatus from an exhaust port 82 provided in the projector. Therefore, since the cooling air for cooling the red light liquid crystal light valve 20 is exhausted in a horizontal flow, the ventilation resistance can be reduced. Further, since the exhaust is exhausted to the projection lens 60 side where the possibility of being located by the user is low, it is possible to alleviate discomfort to the user due to the exhaust air. Further, since the exhaust is directly exhausted from the exhaust port 82 provided on the left side of the projection lens 60 to the outside of the casing A of the projection display apparatus, the exhaust can be performed without providing an exhaust fan. This effect is the same as the case of cooling the liquid crystal light valve 40 for blue light.

  (13) Since the exhaust port 82 on the left side of the projection lens 60 is exhausted in the oblique direction 82b so that the exhaust air is directed away from the projection lens 60, adverse effects on the projected image due to hot air can be avoided. This effect is the same as the case of cooling the liquid crystal light valve 40 for blue light.

(Embodiment 3)
Next, Embodiment 3 will be described with reference to FIG.
In the present embodiment, the method of blowing cooling air to the liquid crystal light valve 20 for red light in the first embodiment is changed. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, the cooling air outlet 91 is provided on the lower surface of the partition wall 76 so that the cooling air for the red light liquid crystal light valve 20 is blown in the vertical direction from below to above. Further, a cooling air discharge port (not shown) is provided on the upper surface which is a target position with the cooling air outlet 91. Further, the cooling fan and the air duct that send the cooling air to the cooling air outlet 91 are individually formed as in the case of the first embodiment. Other configurations such as cooling of the liquid crystal light valve 30 and the blue light liquid crystal light valve 40 are the same as those in the first embodiment.

Since the third embodiment is configured as described above, the optical components constituting the liquid crystal light valves 20, 30, 40 are cooled as follows.
First, the cooling of the liquid crystal light valve 30 for green light and the liquid crystal light valve 40 for blue light is the same as in the first embodiment, and is performed in the same manner as in the first embodiment.

  The optical components constituting the red light liquid crystal light valve 20 are cooled by the cooling air blown upward in the vertical direction from the cooling air outlet 91 provided on the bottom wall of the partition wall 76. The blowing width of the cooling air from the cooling air outlet 91 is set to be slightly larger than the horizontal length of the light transmitting portion that becomes a high temperature in the optical component, that is, the range to be cooled. The cooling air cools the optical components constituting the liquid crystal light valve 20 for red light, and is then discharged into the housing A from an outlet (not shown) formed in the top wall of the partition wall 76. . The cooling air discharged into the housing A is discharged outside the apparatus together with air heated by cooling the power source and the light source 1 by an exhaust fan (not shown).

  Since the projection display apparatus according to the present embodiment is configured as described above, it is the same as the effects (2) to (5), (7), and (8) according to the first embodiment. The effect of can be produced. In addition to this, the following effects can be obtained.

  (14) The cooling of the optical components of the liquid crystal light valve 30 for green light and the liquid crystal light valve 40 for blue light is the same as in the first embodiment, and the vertical duct portion 73a disposed at the left rear position and the right It is cooled by the cooling air blown out in the horizontal direction from the cooling air outlet 72 attached to the vertical duct portion 73a disposed at the rear position. Therefore, with regard to these coolings, it is possible to obtain blown air with a high wind speed as in the case of the first embodiment. Even if the blowing air speed from the cooling air outlet 72 is increased, the size of the cooling fan 71 and the power consumption are increased. Can be suppressed.

  (15) The cooling of the optical component of the liquid crystal light valve 30 for red light is formed such that the cooling air is blown in the vertical direction from below to above toward the range to be cooled on the surface of the optical component. Therefore, this arrangement can be adopted when this is preferable for layout design due to the arrangement of the internal devices.

(Modification)
The present invention can be modified as follows in the above embodiment.
In the second embodiment and the third embodiment, cooling of the liquid crystal light valve 30 for green light and the liquid crystal light valve for red light among the liquid crystal light valves 20, 30, 40 in the first embodiment is performed from below. Although the method of blowing out the cooling air in the vertical direction upward is described, it is not limited to this. That is, the present invention only needs to blow out the cooling air in at least one of the liquid crystal light valves 20, 30, and 40 in the horizontal direction. In the first embodiment, the liquid crystal light for blue light is used. The cooling air may be blown out from the valve 40 in the vertical direction. Further, two liquid crystal light valves of the liquid crystal light valves 20, 30, 40 may be blown out in the vertical direction. Moreover, in the case where the cooling air is blown out in the vertical direction, the cooling air is not limited to the one blown out from the bottom to the top. Therefore, it may be blown out from above.

In the above embodiments, a three-plate liquid crystal projector is used, but other types of liquid crystal projectors may be used.
In each of the above embodiments, a dedicated cooling fan is used for cooling all the liquid crystal light valves, but it may be used for cooling two or more liquid crystal light valves.

  In each of the above embodiments, the cooling air outlet 72 that blows out in the horizontal direction is attached above the separate vertical duct portion 73a, but a plurality of, for example, two cooling air outlets are provided in one vertical duct portion 73a. An outlet may be provided. More specifically, in Embodiment 1, the vertical duct portion 73a at the left front position may be eliminated, and the cooling air outlet 72 may be added to the front side surface of the vertical duct portion 73a at the left rear position.

  In each embodiment, the partition wall 76 includes a side wall that surrounds the four circumferences, a bottom wall that forms the bottom surface, and a top wall that forms the top surface, but does not require a large space in the upper part. In this case, or when the top surface is substantially covered by other equipment, the top face of the partition wall is omitted by the top face of the covered equipment or the casing A. Also good.

  A ... Case, 20, 30, 40 ... Liquid crystal light valve, 50 ... Cross dichroic prism (as photosynthesis device), 60 ... Projection lens, 71 ... Cooling fan, 71a ... Air outlet, 72,83.91 ... Cooling air blow Outlet, 73 ... Air blow duct, 73a (Vertical duct part) Vertical duct part, 77, 82 ... Exhaust port, 77b, 82b ... Diagonal direction.

Claims (7)

A plurality of light modulation devices that light-modulate a plurality of color lights according to image information,
A light combining device for combining the color lights from the plurality of light modulation devices;
A projection lens for enlarging and projecting the light synthesized by the photosynthesis device;
A cooling air outlet for blowing cooling air along the surface of the optical component constituting the light modulator;
A cooling fan for blowing cooling air to the optical component;
An air duct connecting the air outlet of the cooling fan and the cooling air outlet,
For at least one of the plurality of light modulation devices, the cooling air outlet is light-modulated so that the cooling air can be blown horizontally toward the area to be cooled on the surface of the optical component. A projection-type image display device, characterized by being formed on a side of the device. The projection display apparatus according to claim 1, wherein
Each of the light modulation devices is configured to be supplied with cooling air from an individual cooling fan via an air duct. The projection display apparatus according to claim 1 or 2,
The at least one light modulation device of the plurality of light modulation devices has a cooling air outlet at the light modulation device so that the cooling air can be blown horizontally toward a range to be cooled on the surface of the optical component. As for at least one of the plurality of light modulation devices, the cooling air can be blown in the vertical direction toward the area to be cooled on the surface of the optical component. In this way, the cooling air outlet is formed above or below the light modulation device. The projection display apparatus according to claim 1 or 2,
The light modulation device includes liquid crystal light valves for red light, green light, and blue light, the light combining device is a cross dichroic prism, and the light modulation device is light of the cross dichroic prism. Arranged in a U-shape so as to face the incident surface, and further, a duct portion in the vertical direction in which a cooling air outlet is formed on the side surface is arranged on the side of each light modulator, and each light modulator is configured. A projection-type image display device, characterized in that cooling air is blown horizontally along the surface of the optical component. The projection display apparatus according to any one of claims 1 to 4,
The light modulation device includes liquid crystal light valves for red light, green light, and blue light, the light combining device is a cross dichroic prism, and the light modulation device is light of the cross dichroic prism. In one of the light modulation devices that are arranged in a U-shape so as to face the incident surface and are arranged in a direction parallel to the optical axis of the projection lens, the cooling air flows from the cooling air outlet. After the optical component is cooled in the horizontal direction toward the area to be cooled on the surface of the optical component, the optical component is cooled, and then the outside of the casing of the projection display device is provided through an exhaust port provided on the side of the projection lens. A projection-type image display device, wherein the projection-type image display device is formed so as to be exhausted. The projection display apparatus according to any one of claims 1 to 4,
The light modulation device includes liquid crystal light valves for red light, green light, and blue light, the light combining device is a cross dichroic prism, and the light modulation device is light of the cross dichroic prism. It is arranged in a U shape so as to face the entrance surface,
In each of the two light modulation devices arranged in the direction parallel to the optical axis of the projection lens, the cooling air is blown in the horizontal direction from the cooling air outlet toward the area to be cooled on the surface of the optical component. The projection display is characterized in that after cooling the parts, the projection display is characterized in that it is exhausted to the outside of the casing of the projection display from the exhaust port provided on the side of the projection lens. apparatus. The projection display apparatus according to claim 5 or 6,
A projection-type image display apparatus, wherein an exhaust port on a side of the projection lens is exhausted in an oblique direction so that the exhaust air is directed in a direction away from the projection lens.

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