JP3795643B2 - Projector panel cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a panel cooling device in a projector .
[0002]
[Prior art]
Conventionally, a projection cathode-ray tube has been used in a projection television receiver that reproduces and displays a television image on a large screen in order to ensure the luminance of the reproduced image on the large screen. In particular, in order to reproduce and display television images precisely, a three-tube projection television receiver using projection CRTs for each of the three primary colors that make up the television image is large and heavy. It was inconvenient. Recently, liquid crystal elements have been developed, and lightweight and small liquid crystal projectors have been commercialized.
[0003]
The configuration of this liquid crystal projector will be described with reference to FIG.
[0004]
FIG. 4 shows the arrangement of the optical system as viewed from above in a three-plate liquid crystal projector using a liquid crystal panel dedicated for each of the three primary colors.
[0005]
A reflector 52 that condenses white light is disposed behind the light source 51 that emits white light. The white light emitted from the light source 51 is composed of blue, green and red light which are the three primary colors of light. The white light collected by the reflector 52 is transmitted through the first field lens 53, and the projection direction of the light is changed by 90 degrees by the first reflecting mirror 54, and the second field lens 55 and the condenser lens are changed. While passing through 56, it is converted into parallel light. The parallel light is projected onto a blue dichroic mirror 57 that reflects blue light and transmits light of other colors. The blue dichroic mirror 57 is installed at an angle of 45 degrees with respect to the parallel light to be projected, and the blue light reflected by the blue dichroic lens 57 changes the projection direction of the 90-degree light to produce a second reflection. Reflected by the mirror 58. The parallel light of the other color transmitted through the blue dichroic mirror 57 is projected to the green dichroic mirror 59 that reflects the green light and transmits the other color light. The green dichroic mirror 59 is also installed at an angle of 45 degrees with respect to the projected parallel light, and the green light reflected by the green dichroic mirror 59 changes the projection direction of the 90-degree light. The light transmitted through the green dichroic mirror 59 is red light, and the projection direction of the light is changed by 90 degrees by the third reflection mirror 60 and the fourth reflection mirror 61.
[0006]
On the other hand, the blue liquid crystal panel 62B, the green liquid crystal panel 62G, and the red liquid crystal panel 62R for each of the three primary colors of light are installed on three sides of the rectangle as shown in the figure. Deflection plates 63B, 63G, and 63R are provided on the front surfaces of the liquid crystal panels 62B, 62G, and 62R on the light source 51 side. That is, the blue liquid crystal panel 62B has a deflecting plate 63B that deflects the blue parallel light reflected from the second reflecting mirror 58, and the green liquid crystal panel 62G has the green parallel light reflected by the green dichroic mirror 59. The red liquid crystal panel 62R is provided with a deflection plate 63R for deflecting the red parallel light reflected by the fourth reflection mirror 61.
[0007]
The blue, green, and red parallel lights transmitted through the liquid crystal panels 62B, 62G, and 62R through the deflecting plates 63B, 63G, and 63R are combined by a cross prism 64 and a projection lens block 65 that includes a projection lens 65a. Are projected on a screen (not shown).
[0008]
The liquid crystal panels 62B, 62G, and 62G receive a blue signal, a green signal, and a red signal generated by a luminance signal and a color difference signal that constitute a television video signal by a television signal reproduction processing circuit unit (not shown). The images are supplied to the liquid crystal panels 62B, 62G, and 62R, and images of the respective colors are formed on the liquid crystal panels 62B, 62G, and 62R. As a video signal, a video signal from a computer or the like may be processed in addition to a television broadcast signal.
[0009]
In such a liquid crystal projector, the liquid crystal panels 62B, 62G, and 62R are irradiated with light from the light source during driving, and the liquid crystal material of the liquid crystal panels 62B, 62G, and 62R generates heat. Since the heat generated by the liquid crystal material causes deterioration of the image quality of the video to be reproduced, the liquid crystal material is cooled by a cooling device so that the temperature becomes constant during operation.
[0010]
As this cooling device, generally, using a fan that is rotated by an electric motor from the lower part of a housing to which the liquid crystal panels 62B, 62G, and 62R are attached, the outside air is taken in, the outside air is applied to the liquid crystal panels 62B, 62G, and 62R, The generated heat is dissipated. In order to efficiently dissipate heat from the liquid crystal panels 62B, 62G, and 62R, the heat radiation effect is improved by increasing the amount of outside air applied to the liquid crystal panels 62B, 62G, and 62R. For this purpose, a large-sized electric motor fan may be used, the number of rotations may be increased, and the opening for taking in outside air provided in the housing may be increased.
[0011]
However, if a large electric motor fan is used and its rotational speed is increased, noise is generated from the electric motor fan. If an electric motor fan having a low rotational speed is used, the air volume necessary for cooling cannot be obtained.
[0012]
Further, when dust in the outside air adheres to the surfaces of the liquid crystal panels 62B, 62G, and 62R, the attached dust portion does not transmit parallel light, so the dust portion becomes a shadow on the image projected on the screen. Projected. For this reason, a filter for removing dust is provided in the opening for taking in outside air provided in the housing. If the filter mesh is coarse, large dust can be removed, but minute dust cannot be removed. Further, if the mesh is made fine, the amount of outside air taken in decreases, and the air volume necessary for cooling the liquid crystal panels 62B, 62G, 62R cannot be obtained.
[0013]
That is, in order to cool the liquid crystal panel of the liquid crystal projector, an electric motor fan with less noise is used, and further improvement is required in order to ensure the air volume necessary for cooling without adhering dust in the outside air. ing.
[0014]
[Problems to be solved by the invention]
Conventionally, in order to cool a liquid crystal panel of a liquid crystal projector, an electric motor fan with low noise is used, and further improvement is required to secure an air flow necessary for cooling without adhering dust in the outside air. ing.
[0015]
The present invention uses an electric motor fan having a low rotational speed and a fine mesh filter capable of sufficiently removing dust in the outside air, in order to cool the panel even if the amount of outside air taken in from the outside air intake opening is small. An object of the present invention is to provide a panel cooling apparatus capable of obtaining a necessary air volume.
[0016]
[Means for Solving the Problems]
The present invention provides a projector using a panel, the panel mounting fixed, and a cavity having a cooled fresh air blowing port provided directly below the panel, the outside air intake arranged on the lower side of the cavity An electric motor fan, a first protruding piece that is inserted into the cooling outside air blowing port of the cavity and protrudes from the upper surface of the cavity, and an increase in outside air that is extended to the lower surface of the cavity and sucked by the electric motor fan A first wind direction plate having a bent piece that is bent along an inclination; a second protruding piece that is inserted into a cooling outside air blowing port of the cavity and protrudes from an upper surface of the cavity; and the cavity A second wind direction plate having an extension piece extending on the lower surface of the first wind direction plate, and a second wind direction plate extending to the lower surface of the cavity. Guiding induced by extending pieces countercurrent plate, the induced diffusion of the first projecting on the upper surface of the cavity and the second protruding piece, the panel cooling system of a projector, characterized in that for blowing cooling outside air to the panel It is.
[0017]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a panel cooling device for a projector according to the present invention. FIG. 1 (a) is a partially sectional perspective view, and FIG. 1 (b) is an X of FIG. FIG. FIG. 1 shows only the liquid crystal panel and projection lens portion of the liquid crystal projector described in FIG. 4, and the configuration of the optical system from the light source to the liquid crystal panel is omitted.
[0018]
Liquid crystal panels 11B, 11G, and 11R are arranged on three side surfaces of the cube shape, a cross prism 12 is arranged inside the three liquid crystal panels 11B, 11G, and 11R, and the other one side surface of the cube shape. Is provided with a projection lens block 13 having a built-in projection lens. The liquid crystal panels 11B, 11G, and 11R are attached and fixed to the upper surface of the box-shaped cavity. The projection lens block 13 is fixed by a lens fixing plate 15 attached and fixed to the cavity 14. An electric motor fan 16 is attached and fixed inside the lower surface of the cavity 14. The cavity 14 in which the liquid crystal panel 11, the projection lens block 13, and the electric motor fan 16 are disposed is attached and fixed to an exterior housing 17. The exterior casing 17 is formed with a plurality of outside air intake openings 18 for taking in outside air by the electric motor fan 16. A filter 19 for removing dust is disposed in the outside air intake opening 18. Cooling outside air blowing ports 20B, 20G, and 20R are provided in the cavity 14 to which the liquid crystal panels 11B, 11G, and 11R are attached and fixed immediately below the liquid crystal panels 11B, 11G, and 11R. The cooling outside air blowing port 20 is formed with a shape and size required to blow cooling outside air to at least the liquid crystal panel 11. A first wind direction plate 21 and a second wind direction plate 22 are interposed in the cooling outside air blowing port 20. The first wind direction plate 21 has a protruding piece 21 a protruding from the upper surface of the cavity 14 and a bent piece 210 a protruding inside the lower surface of the cavity 14 and bent in the rotation direction of the electric motor fan 16. is doing. The second wind direction plate 22 has a protruding piece 22 a protruding from the upper surface of the cavity 14 and an extending piece 220 a extending inside the lower surface of the cavity 14.
[0019]
The detailed configuration of the first and second wind direction plates 21 and 22 will be described with reference to FIG. FIG. 2 is a developed perspective view showing the relationship and shape between the cavity 14 and the first and second wind direction plates 21 and 22.
[0020]
The first wind direction plate 21 is formed in the plate body 25, and protrudes pieces 21a, 21b, 21c protruding above the plate body 25, and the bent pieces 210a, 210b, 210c protruding downward and bent. have. The second wind direction plate 22 is formed in the plate body 26, and includes projecting pieces 22a, 22b, and 22c that project above the plate body 26, and extended pieces 220a, 220b, and 220c that extend downward. Yes. The protruding pieces 21a, 21b, 21c and 22a, 22b, 22c protruding above the plate bodies 25 and 26, the bent pieces 210a, 210b, 210C and the extending pieces 220a, 220b, 220c protruding downward, The cooling external air blowing ports 20B, 20G, and 20R of the cavity 14 are formed so as to oppose the longitudinal direction. The first and second wind direction plates 21 and 22 formed in this manner are obtained by stacking the plate body 25 of the first wind direction plate 21 on the plate body 26 of the second wind direction plate 22, The screw holes 27 a, 27 b, 27 c provided in 26 are attached and fixed to the cavity 14. The projecting pieces 21 a, 21 b, 21 c of the first wind direction plate 21 and the projecting pieces 22 a, 22 b, 22 c of the second wind direction plate 22 are spaced apart from each other within the cooling outside air blowing port 20 of the cavity 14. And are formed to face each other.
[0021]
FIG. 3 is an enlarged perspective view of the attachment of the wind direction plates 21 and 22 in FIG. 3 with respect to the state in which the first and second wind direction plates 21 and 22 are fixedly attached to the cavity 14 and the wind direction operation of the cooled outside air by the wind direction plates 21 and 22 It explains using. In this figure, the protruding piece 21a and the bent piece 210a of the first wind direction plate 21 and the protruding piece 22a and the extended piece 220a of the second wind direction plate 22 are attached to the cooling outside air blowing port 20B. The other cooling outside air blowing ports 20G and 20R are also omitted because the wind direction plates 21 and 22 are similarly attached.
[0022]
The protruding pieces 21a and 22a of the first and second wind direction plates 21 and 22 are inserted into the opening in the longitudinal direction of the cooling outside air blowing port 20G at a predetermined interval. That is, with respect to the dimension T in the longitudinal direction of the cooling outside air blowing port 20G in the figure, the dimension T1 between the protruding piece 21a of the first air direction plate 21 and the inside of the cooling outside air blowing port 20G, The dimension T2 between the projecting pieces 21a and 22a of the second wind direction plate and the dimension T3 between the projecting piece 22a of the second wind direction plate 22 and the inside of the cooling outside air blowing port 20G are predetermined spacing dimensions. It is formed. Note that the interval dimensions do not need to be equal, and the interval dimensions T1, T2, and T3 may be different as long as the cooling outside air described later can be blown.
[0023]
Thus, the electric motor fan 16 provided inside the lower side of the cavity 14 with respect to the cooling outside air blowing port 20G in which the first and second wind direction plates 21 and 22 are formed is indicated by an arrow in the figure. As indicated by Z, assuming that the electric motor fan 16 is rotating in the clockwise direction when viewed from the lower side, the outside air taken in by the electric motor fan 16 rises toward the cooling outside air blowing port 20G. This rising outside air does not rise directly above in the figure, but is spiraled by the rotation of the electric motor fan 16, and the arrows A ′, B ′, C ′ in the figure with respect to the cooling outside air blowing port 20G. , D ′ rises in an oblique direction from lower right to upper left. Among the outside air rising obliquely, the outside air indicated by arrows A ′, B ′, C ′, and D ′ (hereinafter referred to as outside air A ′, B ′, C ′, and D ′) is the first wind direction plate. The outside air A ′ is reflected by the protruding piece 21a of the first wind direction plate 21 and rises in the direction of arrow A in the figure. The outside air B ′ passes outside the protruding piece 21a of the first wind direction plate 21, is reflected by the protruding piece 22a of the second wind direction plate 22, and rises in the direction of arrow B in the figure. The outside air C ′ passes outside the protruding piece 21a of the first wind direction plate 21 and is reflected at the lower end of the protruding piece 22a of the second wind direction plate 22, and the reflected outside air is again the first air. Is reflected at the upper end of the protruding piece 21a of the wind direction plate 21 and rises in the direction of arrow C in the figure. Further, the outside air D ′ passes under the bent piece 210a of the first wind direction plate 21 and is reflected by the extending piece 220a of the second wind direction plate 22, and the reflected outside air is The light is reflected again by the projecting piece 21a of the first wind direction plate 21, and rises in the direction of arrow D in the figure.
[0024]
In this way, by installing the first and second wind direction plates 21 and 22 in the cooling outside air blowing port 20G, the liquid crystal panel 11G disposed directly above the cooling outside air blowing port 20G is viewed from above. In addition, the cooling outside air can be supplied to the entire surface of the liquid crystal panel 11G.
[0025]
If the first and second wind direction plates 21 and 22 do not exist, the outside air A ′, B ′, C ′, and D ′ sucked by the electric motor fan 16 is almost parabolic, Ascending from the lower right to the upper left, the outside air is blown only to the lower left half of the liquid crystal panel 11G, and the outside air is not blown to the upper right half of the liquid crystal panel 11G. The effect is reduced, and uniform video reproduction over the entire surface of the liquid crystal panel 11G becomes impossible.
[0026]
Therefore, according to the present invention, the first and second wind direction plates 21 and 22 are provided in the cooling outside air blowing port 20, and the first wind direction plate 21 has a rising inclination of the outside air raised by the electric motor fan 16. A bent piece 210a is provided, the outside air rising along the bent piece 210a is reflected by the projecting pieces 21a and 22a of the first and second wind direction plates 21 and 22, and the first wind direction plate is provided. The outside air passing through the lower side of the bent piece 210 a is reflected by the extending piece 220 a of the second wind direction plate 22, and a large amount of outside air is blown from the cooling outside air blowing port 20 to the liquid crystal panel 11. In addition, uniform outside air can be blown over the entire area of the liquid crystal panel 11.
[0027]
In the above description, one each of the first and second wind direction plates 21 and 22 are provided in the cooling outside air blowing port 20 of each liquid crystal panel 11, but the first and second wind direction plates 21 and 22 are provided. Or by providing a plurality of any one of the wind direction plates and changing the dimensions of the bent piece 21a of the first wind direction plate 21 or the extending piece 220a of the second wind direction plate 22. It is also possible to increase the amount of outside air accumulated and increase the air volume to the liquid crystal panel 11.
[0028]
In the above description, a three-plate liquid crystal projector is used. However, the cooling device of the present invention can also be applied to a single-plate liquid crystal projector that reproduces the three primary colors of a television image on a single-plate liquid crystal panel.
[0029]
As a result, the electric motor fan 16 uses a low noise and low rotation speed, and a dust collecting filter installed in the outside air intake opening can remove fine dust. Even if the air volume of the outside air is small, it is possible to reliably accumulate the small air volume and to blow air over the entire area of the liquid crystal panel 11, and to efficiently release the heat generated in the liquid crystal panel 11. Can now maintain a stable operating state.
[0030]
【The invention's effect】
By using the panel cooling device of the present invention, an electric motor fan for cooling with extremely low noise and low rotation speed and a filter capable of collecting fine dust can be adopted to reduce the amount of outside air intake. However, it is possible to effectively collect the sucked outside air and blow it to the liquid crystal panel, and the outside air can efficiently cool and exhaust the heat generated by the liquid crystal panel.
[0031]
In addition, in order to improve the brightness of the image projected on the screen from the liquid crystal projector, even if a high-intensity light source is used, the heat generation of the liquid crystal panel by this high-intensity light source can be sufficiently cooled and exhausted. Low noise and high brightness can be realized.
[Brief description of the drawings]
FIG. 1A is a partially sectional perspective view showing an embodiment of a projector according to the present invention, and FIG. 1B is a sectional view taken along cutting lines X and Y in FIG. Figure.
FIG. 2 is a developed perspective view illustrating the shape of a wind direction plate according to the present invention.
FIG. 3 is an enlarged perspective view showing a mounting state and a wind direction of a wind direction plate according to the present invention.
FIG. 4 is a plan view showing a configuration of a liquid crystal projector.

Claims (4)

In projectors using panels ,
The panel was mounted and fixed, and a cavity having a cooled fresh air blowing port provided directly below the panel,
An electric motor fan for inhaling outside air disposed below the cavity;
A first protruding piece that is inserted into the cooling outside air blowing port of the cavity and protrudes from the upper surface of the cavity, extends to the lower surface of the cavity, and is folded along the rising inclination of the outside air sucked by the electric motor fan. A first wind direction plate having a bent piece;
A second projecting piece inserted into the cooling outside air blowing port of the cavity and projecting from the upper surface of the cavity; and a second wind direction plate having an extending piece extending to the lower surface of the cavity;
The outside air sucked by the electric motor fan is guided and guided by the bent piece of the first wind direction plate and the extended piece of the second wind direction plate extending to the lower surface of the cavity, and protrudes to the upper surface of the cavity. and said first and induced diffusion in the second protruding piece, projector panel cooling apparatus characterized by blowing cooling outside air to the panel. The first and second wind direction plates are formed of different plates, and the first wind direction plate is overlapped with the second wind direction plate and fixed to the cavity. Projector panel cooling system. 2. The panel cooling device for a projector according to claim 1, wherein the opening of the cooling outside air blowing port of the cavity is divided at a predetermined interval by the protruding pieces of the first and second wind direction plates. The at least one of the said 1st and 2nd wind direction board is provided with two or more, The size of the bending piece of the said 1st wind direction board and the said extension piece of the said 2nd wind direction board is varied. The projector panel cooling device according to claim 1.

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