JPH08314011A - Light source device for liquid crystal projector - Google Patents

Abstract

PURPOSE: To prevent light from the light source lamp of a liquid crystal projector device from being leaked from an exhaust port and to prevent the broken piece of glass from falling out to the outside of a machine from the exhaust port in the case the lamp bursts. CONSTITUTION: A lamp unit 3 is constituted by attaching a metal halide lamp 1 in a reflector 2 and attached to a lamp box 4. A ventilating fan 6 is provided at the rear of the lamp unit, and air is sucked from the upside of the front part of the lamp unit as shown by an arrow, passes under the lamp unit from the lower part of the lamp unit and is discharged to the outside of the machine from the exhaust port 8 of a houing 7. A V-shaped or U-shaped barrier 9 is formed between the base of the lamp box and the lamp unit, so that the broken piece of glass is kept in the barrier in the case the lamp bursts and prevented from falling out from the exhaust port. The light from the lamp is prevented from being leaked from the exhaust port.

Description

Detailed Description of the Invention

[0001]

[Technical Field] The present technology relates to a light source device of a liquid crystal projector, which reduces light leakage of a light source lamp from an exhaust port of a cooling fan, and when the light source lamp bursts, glass fragments are ejected from the exhaust port. Regarding what to avoid.

[0002]

2. Description of the Related Art A metal halide lamp (hereinafter abbreviated as a lamp) or the like is used as a light source of a liquid crystal projector device.
This lamp is installed in a parabolic reflector to collect direct light from the lamp and reflected light from the reflector,
It illuminates the liquid crystal panel, generates image light, and projects it on the screen with a projection lens. The lamp emits strong light due to arc discharge, and heat generated by light emission causes thermal convection in the lamp bulb, resulting in a temperature difference between the upper and lower sides of the lamp bulb, resulting in non-uniform gas concentration and arc arc shape. There is a problem that the center of light emission deviates from the optical axis and the light utilization rate decreases, and in order to prevent this, it is customary to perform forced ventilation to cool the lamp and the like. FIG. 3 is a side sectional view of a conventional lamp unit (on which the reflector and the lamp are attached) and an exhaust fan portion. As shown by an arrow, an exhaust fan 6 is provided behind the lamp unit 3 to The upper part of the front of the unit 3-> the inside and outside of the reflector 2-> the bottom of the lamp unit-> the ventilation fan 6 ventilates the air heated by the lamp unit 3 to the outside of the unit from the ventilation port 8 of the housing 7, The reflector 2 etc. are being cooled. The exhaust fan 6 is for cooling the lamp 1 and the like, and at the same time is for discharging heat generated at various parts inside the machine such as a power source or a liquid crystal panel.

As described above, since the metal halide lamp 1 emits strong light, when the exhaust fan 6 is provided behind the lamp unit 3, the light reflected inside leaks out of the machine from the exhaust port 8 of the housing 7. There is a problem that the leaked light becomes obtrusive when the surroundings are dark. Also, the lamp 1 is filled with high-pressure gas, and when the lamp 1 ruptures, glass fragments are scattered, and this fragment is exhausted. May be carried by the vehicle and jump out of the machine through the exhaust port 8.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention prevents the light of a lamp used as a light source of a liquid crystal projector device from leaking from the exhaust port to the outside of the machine.
This is to prevent large pieces of glass from jumping out of the machine through the exhaust port when the lamp bursts.

[0005]

In order to solve the above-mentioned problems, the present invention provides a liquid crystal projector device in which a metal halide lamp is mounted in a reflector to form a lamp unit, and an exhaust fan is provided behind the lamp unit.
Air that has been sucked in from above the front of the lamp unit and has been warmed by the lamp unit is exhausted rearward through the space below the lamp unit, and a V-shaped or U-shaped air flow path is provided below the lamp unit. The present invention provides a light source device for a liquid crystal projector in which the V-shaped or U-shaped barrier is provided so that the bottom side thereof is the rear side of the lamp unit.

[0006]

With the above construction, in the light source device of the liquid crystal projector according to the present invention, a V-shaped or U-shaped barrier is attached to the exhaust air passage below the lamp unit to block the light from the light source lamp. To prevent light from leaking out of the machine from the exhaust port behind the lamp unit.
If the lamp bursts, the fragments of glass carried by the exhaust air will be kept inside this V-shaped or U-shaped barrier to prevent it from jumping out of the machine through the exhaust port.

[0007]

Embodiments of the light source device of a liquid crystal projector according to the present invention will be described in detail below with reference to the drawings. 1 is a side sectional view of an essential part of an embodiment of a light source device for a liquid crystal projector according to the present invention, and FIG. 2 is a perspective view of the essential part. 1 and 2, reference numeral 1 denotes a metal halide lamp, which emits light by arc discharge. Reference numeral 2 denotes a reflector, the inner surface of which is formed into a parabolic mirror, and the metal halide lamp 1 is attached so that the center of light emission coincides with the optical axis (the central axis of the optical system). Three
Is a lamp unit including the metal halide lamp 1, the reflector 2 and the like. Reference numeral 4 is a lamp box that houses the lamp unit 3 and has a cold mirror 5 on the front surface for removing infrared rays and ultraviolet rays unnecessary for lighting.
To provide. Reference numeral 6 denotes an exhaust fan, which is ventilated through a route of above the front of the lamp unit 3 → inside / outside of the reflector → bottom of the lamp unit → exhaust fan 6 to provide the lamp 1 and the reflector 2.
And the like, and at the same time, heat generated by the power supply inside the machine or the liquid crystal panel is discharged. Reference numeral 7 denotes a housing, which is provided with a ventilation port 8 for passing exhaust gas from the exhaust fan 6.

A V-shaped barrier 9 is provided on the bottom surface of the lamp box 4. This barrier 9 prevents the reflected light of the lamp 1 from leaking out of the machine through the exhaust port 8 of the housing 7, and when the lamp 1 is ruptured, the glass fragments of the lamp 1 are carried by the exhaust air, and the ventilation port is provided. It is to prevent the glass from jumping out of the machine from the No. 8 and is formed in a V shape so that the broken glass pieces are held at the bottom portion of the V shape. The barrier 9 prevents light leakage and prevents glass fragments from jumping out, but does not hinder the flow of exhaust air, so that the width of the left and right (front and back directions in FIG. 1) and the lamp unit 3 are increased. The gap between and is set appropriately. This prevents powdery fine glass from popping out, but prevents large glass fragments from popping out. In the above description, the barrier 9 has a V shape, but U
It may be formed in a V shape so that the glass shards are retained at the bottom of the U shape.

[0009]

As described above, according to the light source device of the liquid crystal projector of the present invention, the light of the light source lamp leaking from the exhaust port is a V-shaped or U-shaped barrier provided in the exhaust air passage below the lamp unit. Since it is shielded by the light, light leakage does not obstruct in a dark room, and when the lamp bursts, the glass fragments carried by the exhaust air are held by this V-shaped or U-shaped barrier.
Large debris does not fly out of the machine through the exhaust port.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part of an embodiment of a light source device of a liquid crystal projector according to the present invention.

FIG. 2 is a perspective view of a main part of an embodiment of a light source device of a liquid crystal projector according to the present invention.

FIG. 3 is a side sectional view of an essential part of an example of a light source device of a conventional liquid crystal projector.

[Explanation of symbols]

 1 Metal Halide Lamp 2 Reflector 3 Lamp Unit 4 Lamp Box 5 Cold Mirror 6 Exhaust Fan 7 Enclosure 8 Ventilation Port 9 V-shaped Barrier

Claims (4)

[Claims] 1. In a liquid crystal projector device, a metal halide lamp is installed in a reflector to form a lamp unit, an exhaust fan is provided behind the lamp unit, and suction is performed from the upper front side of the lamp unit to be warmed by the lamp unit. A light source device for a liquid crystal projector, wherein the air is exhausted rearward through a space below a lamp unit, and a barrier is provided in an exhaust air passage below the lamp unit. 2. The light source device for a liquid crystal projector according to claim 1, wherein the barrier is formed in a V shape, and the bottom side of the V shape is arranged to be the rear side of the lamp unit. 3. The light source device of a liquid crystal projector according to claim 1, wherein the barrier is formed in a U shape, and the U-shaped bottom side is arranged so as to be the rear side of the lamp unit. 4. The light source device for a liquid crystal projector according to claim 1, wherein the barrier is provided substantially in the center of the exhaust air passage.