JPH0723330U - LCD projector - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to reduce the heat of the internal members of a liquid crystal projector using a liquid crystal panel. [Structure] A lighting unit which is a main heat source of a liquid crystal projector, a filter such as an incident side polarization member, and a heat absorption filter are directly or indirectly covered with a metal having a high heat conductivity as a second frame for heat transfer. Make up the composition. [Effect] Since the heat radiation area of the heat source is increased and the cooling efficiency is improved, there is an effect that a smaller and more convenient liquid crystal projector can be obtained. Further, there is an effect that a liquid crystal projector with improved reliability can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to protecting internal components of a liquid crystal projector from internal heat generation of a liquid crystal projector using a liquid crystal panel.

[0002]

[Prior art]

 As a liquid crystal projector, a three-panel system that uses three liquid crystal panels for each of red, green, and blue, and a red, green, and blue color filter in one panel are enough for one liquid crystal panel. In recent years, single-panel LCD projectors that are compact and lightweight and easy to carry have come into the market.

The conventional technique is described in detail in Japanese Patent Laid-Open No. 4-27929. A diagram shown in Japanese Patent Laid-Open No. 4-27929 is shown in FIG. 2 and an outline of a conventional technique of a single-panel liquid crystal projector will be described. An outline of a liquid crystal projector will be described below. The illumination unit 203 includes an illumination source 201, and although not shown, it is often used to store the illumination source 201 in an explosion-proof cylinder. The light emitted from the illumination source 201 is condensed by the condenser lens 202, then enters the incident side polarization member 103, further passes through the liquid crystal cell 108, the emission side polarization member 109, the projection lens 300, and the liquid crystal projector 200. . The original image projected is formed by the incident side polarization plate 103, the liquid crystal cell 108, and the emission side polarization plate 109. The circuit 600 for controlling and driving the member between the illumination unit 203 and the projection lens 300 and the liquid crystal cell 108, and the fan 400 for air-cooling the inside of the liquid crystal projector 200 are covered with the first frame 500.

[0004]

[Problems to be solved by the device]

 Conventionally, a high-luminance lamp such as a xenon lamp, a halogen lamp, or a metal halide lamp has been used as a lamp which is an illumination source 201 of the liquid crystal projector 200, and this kind of lamp generates a considerable amount of heat. Further, in the liquid crystal projector 200 shown in FIG. 2 which is a conventional technique, since the transmittance of the polarizing member is low, about 60% of the light emitted from the illumination means 200 becomes heat at the incident side polarizing member 103. As described above, in the liquid crystal projector 200, due to the high-luminance light source, the heat generation in the incident side polarization member 103 becomes very high, and the temperature characteristic change and deterioration of the liquid crystal due to high temperature and the deterioration of the polarization member occur. The appearance of the projected image is deteriorated, the life of the liquid crystal cell 108 is shortened, and the resin frame body is deteriorated.

Further, in the incident side polarization member 103, a filter such as a heat absorption filter is arranged at the position of the condenser lens so that all the frequency components of the light of the illumination source 201 do not hit the incident side polarization member 103. Set up. By disposing a filter such as a heat absorption filter, the temperature rise of the incident side polarization member 103 is reduced, but there is a problem that the heat absorption filter deteriorates because the heat absorption filter generates heat.

[0006]

[Means for Solving the Problems]

 A first means used by the present invention to solve the above-mentioned problems is a liquid crystal projector in which at least a liquid crystal panel, an illumination unit and a projection lens are housed in a first frame, and the illumination unit is provided in a second frame. It is characterized in that it is disposed on the body and the second frame is housed inside the first frame.

A second means used by the present invention to solve the above-mentioned problems is a liquid crystal projector in which at least a liquid crystal panel, an illumination unit and a projection lens are housed in a first frame, and the illumination unit and the A filter is provided between the liquid crystal panel, the lighting unit and the heat absorption filter are provided in a second frame, and the second frame is housed inside the first frame. To do.

A third means used by the device to solve the above problems is that the first frame is mainly formed of a resin material, and the second frame is a metal material having good thermal conductivity. It is characterized by being molded in.

[0009]

[Action]

 According to the structure of the liquid crystal projector in the present invention, the heat-absorbing filter, which is the main heat source of the liquid crystal projector, the illumination unit, the incident-side polarization plate, and the filter, is directly covered with a metal having good thermal conductivity. The heat dissipation area of the heat source is increased, which has the effect of improving cooling efficiency. Furthermore, since the first frame can be made of a resin material, it has the effects of improving workability and designing.

[0010]

【Example】

 An explanation will be given below with reference to FIG. 1 showing a sectional view of a liquid crystal projector which is an embodiment of the present invention. An illumination source 201 including a reflector and a light source lamp is inserted in a socket 204, and the socket 204 is fixed to a socket support member 205. On the other hand, the end of the illumination source 201 on the opposite side of the socket 204 is in contact with the illumination source support member 206, and the illumination source 201 is supported by the socket support member 205 and the illumination source support member 206, and The end of the light source 201 and the illumination source support member 206 are in close contact with each other at the contact portion 701, and the heat of the illumination source 201 is transferred to the illumination source support member 206 and the second frame body 100 via the contact portion 701. ing.

A heat absorption filter 102, which is a filter, is disposed on the side opposite to the illumination source 201 with respect to the illumination source support member 206, and the heat absorption filter 102 is supported by the support member 101 made of a transparent member. There is. The support member 101 may be provided on the illumination source 201 side with respect to the heat absorption filter 102, or the support member 101 may be omitted. Further, the heat absorption filter may be an infrared cut filter or an infrared reflection filter. The socket support member 205, the socket 204, the illumination source 201, the illumination source support member 206, the heat absorption filter 102 and the support member 101 are covered with the second frame body 100 having the ventilation holes 104 and the ventilation holes 105. The heat absorption filter 102 is in contact with the second frame 100 at the contact portion 702. The heat of the heat absorption filter 102 is transferred to the second frame body 100 via the contact portion 702.

An incident side polarization member 103, a liquid crystal cell 106, an emission side polarization member 107, and a projection lens 300 are arranged on the side opposite to the illumination source 201 with respect to the heat absorption filter 102. As shown in FIG. 1, it is covered with a first frame body having a ventilation hole 501, a ventilation hole 502, and a sound emission hole 503. Inside the first frame, a circuit board 601 and a circuit board 602 equipped with a circuit for controlling and driving a fan 400 and a liquid crystal projector that forcibly create an air flow inside the first frame, and a speaker that emits sound Etc. are built in.

Light emitted from the illumination source 201 is absorbed by the heat absorption filter 102 in the infrared region of light that is a main cause of heat generation and enters the incident side polarization member 103. The light emitted from the incident side polarization member 103 enters the liquid crystal cell and becomes image-formed light from the emission side polarization member 107, enters the projection lens 300, and is displayed as an enlarged image on the screen from the projection lens 300.

The illumination source 201 generates light as well as heat to reach a high temperature, and the light emitted from the illumination source 201 passes through the infrared region of light, which is the main cause of heat generation in the heat absorption filter 102. Since the heat is absorbed, the heat absorption filter 102 generates heat and becomes high in temperature. However, air is forced to enter from the ventilation hole 501 by the fan to cool the second frame body 100, and at the same time, the heat absorption filter 102 and the illumination source 201 are directly cooled from the ventilation hole 104 of the second frame body 100. The air that has deprived the heat of the second frame 100, the illumination source 201, and the heat absorption filter 102 is discharged to the outside of the first frame 500 through the ventilation holes 502 and the sound emission holes 503.

In the embodiment, the second frame 100 and the illumination source support member 206 are made of aluminum, but any metal material having a good thermal conductivity may be used. Aluminum is also used for the socket support member 205 in the embodiment to increase the area of the radiator of the illumination source 201.

In FIG. 1, the heat absorption filter 102 is arranged in the second frame 100 and the incident side polarization member 103 is outside the second frame, but the heat absorption filter 102 is removed to 2 The incident side polarization member 103 may be arranged at the position of the heat absorption filter 102 in the frame 100. Further, the second frame 100 may be extended to the incident side polarization member 103, and then the incident side polarization member 103 may be supported in the same manner as the method for supporting the heat absorption filter 102 by the second frame 100.

[0017]

[Effect of device]

 As described above, according to the present invention, the illumination unit, the incident side polarization plate and the heat absorption filter, which are the main heat sources of the liquid crystal projector, are directly or indirectly covered with a metal having good heat conductivity in a heat transfer manner. As a result, the heat radiation area of the heat source is increased, which has the effect of improving the cooling efficiency, and thus there is an effect that a smaller and more convenient liquid crystal projector can be obtained. Further, there is an effect that a liquid crystal projector with improved reliability can be obtained.

Further, since the second frame body is made of metal, the first frame body can be made of a resin material, so that the liquid crystal projector can be freely designed.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid crystal projector showing an embodiment of the present invention.

FIG. 2 is a sectional view of a liquid crystal projector showing a conventional technique.

[Explanation of symbols]

 100 2nd frame 101 Support member 102 Heat absorption filter 103 Incident side polarization member 104, 105, 501, 502 Vent 201 201 Illumination source 204 Socket 205 Socket support member 206 Illumination source support member 500 1st frame

Claims (3)

[Scope of utility model registration request] 1. A liquid crystal projector in which at least a liquid crystal panel, an illumination unit, and a projection lens are housed in a first frame, and the illumination unit is disposed in a second frame and the second frame is provided in the first frame. A liquid crystal projector characterized by being stored inside the body. 2. A liquid crystal projector in which at least a liquid crystal panel, a lighting unit and a projection lens are housed in a first frame, a filter is provided between the lighting unit and the liquid crystal panel, and the lighting unit and the filter are provided. Is disposed on the second frame body, and the second frame body is attached to the first frame body.
A liquid crystal projector that is housed inside a frame. 3. The first frame body is mainly made of a resin material, and the second frame body is made of a metal material having good thermal conductivity. The liquid crystal projector according to item 1.