JPH0559449U - Liquid crystal panel cooling device for optical equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the air cooling effect on the liquid crystal panel of the liquid crystal projector. [Configuration] Polarizing plate (37) on the exit side of the liquid crystal panel unit (30)
A baffle plate (40) is hung from the bottom of the chassis, and the air passage under the chassis is blocked by the baffle plate on the downstream side of the liquid crystal panel unit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a device for cooling a liquid crystal panel in an optical device such as a liquid crystal projector.

[0002]

[Prior Art]

 As shown in Fig. 1, the liquid crystal projector is equipped with a dichroic mirror (20), a total reflection mirror (21), and a liquid crystal panel unit (30), and emits white light emitted from a light source lamp (10) into R, G, and B lights. The light is split into light beams, passed through each liquid crystal panel, recombined at the position of the light receiving surface of the projection lens (22), and sent to the projection lens. When the light from the light source lamp (10) illuminates the liquid crystal panel unit, the liquid crystal panel absorbs light energy and infrared rays to generate heat. In general, liquid crystal panels are vulnerable to high temperatures, and when the temperature rises, problems such as lowering contrast and varying driving conditions occur.Therefore, a fan for blowing air blows air to the liquid crystal panel to cool it. ..

As shown in FIG. 3, the lower part of the liquid crystal panel unit (30) is mounted on the chassis (50), and the upper part is held by the sub unit (51). The outlet side of the fan (53) is adjusted to the housing (52). ) To prevent the air from leaking out, and guide the air to the blow-in opening (54) which is opened in the chassis (50) in accordance with the position of the liquid crystal unit. The wind passes between the condenser lens (31), the liquid crystal panel (35), and the polarizing plates (36) and (37) which form the liquid crystal panel unit, and cools the respective surfaces with air. However, since the liquid crystal panel unit usually needs to be adjusted for convergence by moving back and forth by several millimeters, an open gap is inevitably formed between the chassis and the liquid crystal panel unit. The wind from the fan (53) passes through the liquid crystal panel unit, and part of the wind (55) flows out from the open gap.

The wind (55) flowing out from the open gap does not contribute to the cooling of the liquid crystal panel and is not only wasted, but the amount of air that must pass through the liquid crystal panel is reduced, which causes a problem of reducing the cooling effect.

[0005]

[Problems to be solved by the device]

 An object of the present invention is to prevent the wind from unnecessarily flowing out from the open gap between the opening (54) of the chassis and the liquid crystal panel unit and improve the cooling effect of the liquid crystal panel.

[0006]

【Constitution】

 The present invention is an optical device equipped with a liquid crystal panel unit (30) and a cooling fan (53), which directs the liquid crystal panel unit from the bottom of the polarizing plate (37) on the exit side toward the housing (52). 40).

[0007]

[Action]

 The air flowing from the fan (50) to the wind passage hits the baffle plate (40) hanging from the exit side polarization plate of the liquid crystal panel unit, flows into the liquid crystal panel unit, and from the opening gap of the opening (54). The outflowing wind almost disappears. The baffle plate (40) allows most of the wind flowing through the passage to pass into the liquid crystal panel unit and enhance the cooling effect of the liquid crystal panel.

[0008]

[Description of the preferred embodiment]

 As shown in FIG. 2, in the liquid crystal panel unit, the lower part of the mounting frame (32) of the condenser lens (31) is fixed on the chassis (50), and the upper part of the mounting frame (32) is mounted on the sub-chassis (51). .. A fixed frame (39) was provided via a spacer (33), an inlet side polarizing plate (36) was attached on the fixed frame (39), and a liquid crystal panel (35) and an outlet side polarizing plate (37) were further provided. A movable frame (34) is attached. A baffle plate (40), which is close to the air passage housing (52) and has almost the full width of the passage, is attached to the lower portion of the attachment frame (38) of the exit side polarizing plate (37). Therefore, the wind sent from the fan (53) hits the baffle plate (40) and almost all flows into the liquid crystal panel unit, flows along the front and rear surfaces of the liquid crystal panel (35), and cools the air. The baffle plate (40) leaves a gap within the convergence adjustment range of the LCD panel unit between the housing and the chassis, but the air flowing out from the open opening of the chassis is almost eliminated, and most of the air volume is The panel can be used for air cooling.

When the exit side polarizing plate (37) is attached in close contact with the liquid crystal panel (35), the gap between the liquid crystal panel (35) and the exit side polarizing plate (37) is eliminated. 40) may be directly attached to the lower part of the mounting frame of the liquid crystal panel (35).

[Brief description of drawings]

FIG. 1 is a plan view of a liquid crystal projector.

FIG. 2 is a cross-sectional view of a fan and a liquid crystal panel unit.

FIG. 3 is a sectional view of a conventional device.

[Explanation of symbols]

 (30) Liquid crystal panel unit (31) Condenser lens (35) Liquid crystal panel (36) Inlet side polarizing plate (37) Outlet side polarizing plate (40) Baffle plate (50) Chassis (51) Sub chassis (52) Housing (53 ) Cooling fan (54) Blow-out opening

Claims (1)

[Scope of utility model registration request] 1. A condenser lens (31), an entrance side polarizing plate
(36), the liquid crystal panel (35), the exit side polarizing plate (37) is arranged in parallel to the liquid crystal panel unit (30) is attached to the chassis (50), the cooling fan (53) provided on the lower surface of the chassis. Cover the outlet side with the housing (52) to form a cooling air passage,
In a device that cools a liquid crystal panel unit by blowing air into the liquid crystal panel unit from a blowout opening (54) formed in a chassis (50), the liquid crystal panel unit has an outlet side polarizing plate.
A cooling device for a liquid crystal panel in an optical device, wherein a baffle plate (40) is hung from a lower part of (37) toward a cooling air passage in a housing (52).