JP2010176054A - Projection type display device - Google Patents

Abstract

In a projection display device equipped with a liquid cooling device that circulates liquid to cool a heat-generating component, a radiator that dissipates the heat taken away from the heat-generating component leads to a large amount of cool air outside the device and provides cooling performance. The projection display device is improved, the reliability of the heat generating component is ensured, and the reliability is high.
A dustproof filter 7 for preventing dust from entering the inside of the device, a liquid cooling radiator 9 disposed immediately after the dustproof filter 7, an air intake through the dustproof filter 7 and the radiator 9, and A fan group including a plurality of sirocco fans arranged such that a distance between at least one sirocco fan 11b and the radiator 9 is separated from a distance between other sirocco fans 11a and the radiator, and the radiator 9 and the fan group are surrounded. A duct 12 is provided to increase the air volume and improve the cooling performance.
[Selection] Figure 2

Description

  The present invention relates to a projection display device such as a projector, and particularly relates to a cooling technique for a built-in component.

  Conventionally, as an apparatus for obtaining a large screen image, an image display device such as a DMD (Digital Micromirror Device) or a liquid crystal is used to modulate light from a light source lamp with a video signal to form an optical image and irradiate it. 2. Description of the Related Art Projection display devices such as projectors that perform enlarged projection on a screen using a projection lens are known.

In recent years, along with higher brightness, smaller size, and lower noise in projection display devices, liquid cooling systems have been introduced that circulate the internal heat generating components by using a pump or the like to remove heat and dissipate heat with a radiator. It is coming.
JP 2008-217041 A

  In order to efficiently cool the heat-generating parts, it is necessary to guide a large amount of cool air outside the apparatus to the radiator, not the air heated inside the apparatus. However, since a dustproof filter is generally arranged at the air inlet so that dust does not enter the inside of the projection display device, the ventilation resistance is large, the airflow is reduced, and a sufficient airflow cannot be guided to the radiator. .

  The present invention solves such problems, and in a projection display device equipped with a liquid cooling device that circulates liquid to cool a heat generating component, in a radiator that dissipates heat taken from the heat generating component, The purpose is to realize a projection display device with high reliability by guiding a large amount of cool wind outside the device to improve the cooling performance, ensuring the reliability of the heat generating components.

  In order to achieve the above-mentioned object, a projection display device according to the present invention includes a dustproof filter that prevents dust from entering the inside of the device, a liquid cooling radiator disposed immediately after the dustproof filter, a dustproof filter, and a radiator. A group of fans including a plurality of sirocco fans arranged to inhale and having a distance between at least one sirocco fan and a radiator separated from a distance between other sirocco fans and a radiator; and a radiator And a duct surrounding the fan group.

  With such a configuration, a large amount of cold air outside the projection display device can be guided to the radiator to improve the cooling performance of the liquid cooling device, and a highly reliable projection display device can be realized.

  Further, the projection type display device of the present invention is characterized by comprising a rotation detecting means for detecting the rotational speed of the fan and an air volume detecting means in the vicinity of the exhaust of the fan.

  With such a configuration, even if the fan speed increases or decreases due to a lifetime or disturbance factor, the fan speed can be detected and controlled to a desired speed. Also, even if dust adheres to the dustproof filter and the ventilation resistance increases, the airflow detection means located near the exhaust of the fan detects the decrease in the airflow, increases the rotation speed of the fan, and ensures the cooling performance. Can do. As a result, it is possible to realize a highly reliable projection display device that is unlikely to cause deterioration of heat-generating components or a reduction in lifetime.

  Further, the projection type display device of the present invention further includes an atmospheric pressure detection unit, and controls the rotational speed of the fan of the cooling unit based on information output from the atmospheric pressure detection unit.

  With such a configuration, even when installed in an environment with different atmospheric pressures, it is possible to distinguish a decrease in air volume from dust adhering to the dustproof filter, and to control the rotational speed of the fan to a predetermined rotational speed. The rotational speed can be controlled accurately and reliably.

  According to the configuration of the present invention, in a projection type display device including a dust-proof filter that prevents dust from entering the apparatus and a liquid-cooling radiator disposed immediately after the dust-proof filter, the cooling performance of the liquid-cooling device, Highly accurate and reliable control is possible, and it is possible to realize a high-quality and highly reliable projection display device that suppresses deterioration of the heat-generating components and lifetime reduction.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

(Embodiment)
First, the outline of the optical system in the projection display apparatus according to the embodiment of the present invention will be briefly described with reference to FIG.

  The optical system 2 in the apparatus 1 includes a light combining unit 3 as a light combining unit that combines output light from the light source lamps 21a and 21b, and a display including an image display element such as a DMD (Digital Micromirror Device). The device unit 5, the condensing unit 4 as a condensing unit that propagates the output light from the light combining unit 3 to the display device unit 5, and the projecting unit 6 as a projecting unit that projects an image by the output light from the display device unit 5. It has.

  The display device unit 5 includes a total reflection prism (not shown) and a reflection type light valve 51 as an image display element, and forms a projection image. In the reflection type light valve, mirror elements are arranged in a matrix for each pixel, and the traveling direction of light is modulated according to a video signal, and an optical image can be formed as a change in reflection angle.

  The optical image formed by the display device unit 5 is output to the projection unit 6 and projected onto a screen (not shown) by the projection lens of the projection unit 6.

  Next, a schematic configuration of the apparatus 1 will be described with reference to FIGS.

  2 and 3 are perspective views of main mechanical components that constitute the optical system 2 on which the apparatus 1 is mounted.

  A dustproof filter 7 that prevents dust from entering the inside of the projection display device is disposed at the air inlet of the exterior 8. Immediately after the dustproof filter 7, a radiator 9 is disposed in proximity, and an axial fan 10 and sirocco fans 11 a and 11 b for taking in air through the dustproof filter 7 and the radiator 9 are attached via a duct 12. The sirocco fan 11b is disposed such that the distance between the sirocco fan 11b is separated from the distance between the sirocco fan 11a and the radiator, and the intake port of the sirocco fan 11b does not overlap the sirocco fan 11a. An air volume detection sensor is attached in the vicinity of the exhaust of the sirocco fan 11a, and the axial flow fan 10 and the sirocco fans 11a and 11b are provided with a rotational speed detection means.

  At the end of the pipe of the radiator 9, there is a heat receiving portion 13 that takes the heat of the reflective light valve 51 and transmits the taken heat to the liquid, a pump 14 that circulates the liquid, and a reserve tank 15 that replenishes the liquid that gradually evaporates. Connected by piping.

  Next, the operation will be described. Light emitted from the light source lamps 21 a and 21 b is guided to the reflection type light valve 51 through the light combining unit 3 and the light collecting unit 4, and projected onto the screen through the projection unit 6. A part of the light guided to the reflection type light valve 51 is not reflected but is absorbed as heat, and the temperature of the reflection type light valve 51 is increased. The heat receiving unit 13 attached to the back surface of the reflective light valve 51 takes the heat of the reflective light valve 51 and transmits the heat taken to the liquid to raise the liquid temperature. The liquid whose temperature has risen is transported to the radiator 9 by the pump 14. The liquid whose temperature has risen in the radiator 9 is heat-exchanged with the air that has passed through the dust filter 7 by the axial fan 10 and the sirocco fans 11a and 11b, so that the temperature is lowered and passes through the reserve tank 15 to the heat receiving unit 13. Returning, the heat of the reflective light valve 51 is taken again, and the reflective light valve 51 is kept at an appropriate temperature.

  Here, in order to improve the heat dissipation performance, it is necessary to increase the size of the radiator 9 and increase the amount of air passing through the radiator 9. However, when the radiator 9 is increased in size and the air volume is increased, the fan needs to be increased in size and plural, the projection display device itself is large, and noise is increased. Therefore, since a high wind pressure is obtained, the intake air of the sirocco fans 11a and 11b, which can cool the optical component 18 and the light source lamp 21a through the optical component cooling duct 16 and the light source lamp cooling duct 17, is used. It is trying to increase. Further, in order to reduce the thickness of the projection display device and reduce the resistance of wind passing through the radiator 9, the distance between the sirocco fan 11 b and the radiator 9 is separated from the distance between the sirocco fan 11 a and the radiator 9. In the past, the inlet of the sirocco fan 11b is arranged so as not to overlap the sirocco fan 11a. Here, the duct 12 is provided with a wall so that the axial fan 10 and the sirocco fans 11a and 11b suck the air that has passed through the dustproof filter 7 and the radiator 9 instead of the air inside the projection display device. In the present embodiment, the single sirocco fan 11b arranged separately is used, but the number may be increased to form a fan group.

  The optical component cooling duct 16 is provided with an air volume detection means 19 and each fan is provided with a rotation speed detection means (not shown). The rotation speed of the fan increases or decreases depending on the lifetime or disturbance factors. Even in this case, it is possible to detect the rotational speed of the fan and control it to a desired rotational speed. Further, even when dust adheres to the dustproof filter 7 and the ventilation resistance increases, the airflow detecting means 19 disposed in the optical component cooling duct 16 detects a decrease in the airflow, increases the rotational speed of the fan, and the cooling performance. Can be secured.

  Further, an air pressure detecting means (not shown) is provided in the vicinity of the dust filter 7 so that the reduction in the air volume is distinguished from the dust adhering to the dust filter 7 even when installed in an environment with different air pressures, and the rotational speed of the fan. Can be controlled to a predetermined rotational speed, and the rotational speed of the cooling means can be controlled accurately and reliably.

  Also, even if the fan stops due to a failure, the rotation speed detection means detects the failure of the fan, increases the rotation speed of other fans, reports the failure to the user, and reflects the temperature abnormally. It becomes possible to avoid the failure of the light valve 51.

  As described above, according to the projection display device of the present invention, it is possible to introduce a large amount of cold air outside the projection display device to the radiator, thereby improving the cooling performance of the liquid cooling device, and the deterioration and life of the heat generating components. A highly reliable projection type display device that is less likely to cause a decrease or the like can be realized.

  According to the configuration of the present invention, it is possible to improve the cooling performance of the liquid cooling device, and the projection of a projector or the like that is less likely to cause deterioration of the heat-generating component or the lifespan, and is required to have high brightness and high reliability. It is useful as a mold display device.

The top view which shows the structure of the principal part of the projection type display apparatus in embodiment of this invention Perspective view of the projection display device Perspective view of the projection display device

DESCRIPTION OF SYMBOLS 1 Projection type display apparatus 2 Optical system 3 Photosynthesis part 4 Condensing part 5 Display device part 6 Projection part 7 Dust-proof filter 8 Exterior 9 Radiator 10 Axial fan 11a, 11b Sirocco fan 12 Duct 13 Heat receiving part 14 Pump 15 Reserve tank 16 Optical Component cooling duct 17 Light source lamp cooling duct 18 Optical component 19 Air volume detection means 21a, 21b Light source lamp 51 Reflection type light valve

Claims (4)

A fan group including a dustproof filter for preventing dust from entering the apparatus, a liquid cooling radiator disposed immediately after the dustproof filter, and a plurality of sirocco fans disposed to suck air through the dustproof filter and the radiator And a projection-type display device comprising a duct surrounding the radiator and the fan group. 2. The projection display device according to claim 1, wherein a distance between at least one sirocco fan and a radiator is arranged away from a distance between other sirocco fans and a radiator. The projection display device according to claim 1, further comprising: a rotation detection unit that detects a rotation speed of the fan; and an air volume detection unit in the vicinity of the exhaust of the fan. 4. The projection display device according to claim 3, further comprising an atmospheric pressure detection unit, wherein the number of rotations of the fan of the cooling unit is controlled based on information output from the atmospheric pressure detection unit.