JPH04326683A - Projection type image receiver - Google Patents

Abstract

PURPOSE:To obtain a sufficient heat radiation function without restrictions on optical design by leading liquid heated in a first liquid vessel to a second liquid vessel to radiate heat. CONSTITUTION:The first liquid vessel consists of a cathode-ray tube 1, a projection lens 2, and a vessel 4, and a second liquid vessel 5 having heat radiation fins if disposed above the first liquid vessel. Vessels 4 and 5 are communicated with liquid passages 6 and 7, and each vessel is filled with transparent liquid 3. At the time of image reception, liquid 3 in the vessel 4 heated by the cathode- ray tube 1 is expanded and has the reduced specific gravity and is led into the vessel 5 through the passage 6, and the temperature of liquid 3 is reduced by heat radiation due to heat radiation fins, and liquid 3 has the increased specific gravity and is returned to the vessel 4 through the passage 7. Since liquid 3 is circulated between vessels 4 and 5 by natural convection and heating and heat radiation are repeated in such a manner, the heat radiation effect is improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat dissipation structure for a projection type receiver that enlarges and projects an image projected onto the receiver using a projection lens.

0002

[Prior Art] In recent years, in projection type receivers, for the purpose of cooling and improving the contrast of the projection screen,
It has become mainstream to use a technique of filling a transparent liquid between a cathode ray tube and a projection lens.

A conventional projection type receiver will be explained below with reference to the drawings. FIG. 8 is a sectional view showing an example of the configuration of a conventional projection type receiver. A liquid container 4 is formed between the cathode ray tube 1 and the projection lens 2, and is filled with a liquid 3. During image reception, the temperature of the face of the cathode ray tube 1 becomes high, so heat is led to the radiation fins of the liquid container 4 through the liquid 3 and released to the outside air.

0004

[Problems to be Solved by the Invention] However, in such a conventional configuration, the size, shape, and position of the liquid container are subject to major restrictions from the viewpoint of optical design, and the amount of liquid and the size of the fins are not being able to take enough
The problem was that it was difficult to obtain the maximum heat dissipation effect.

On the other hand, in order to obtain bright displayed images on the screen, the demand for higher output increases, and the amount of heat generated increases accordingly, and how to increase the amount of heat dissipation affects the performance of projection receivers. This is becoming a major factor.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a projection type receiver having a sufficient heat dissipation function without being subject to optical design constraints.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a first method in which the space around the image receiver is filled with liquid.
a second liquid container having a heat dissipation means provided above the liquid container;
One or more liquid passages are connected between the liquid container and the liquid container.

[0008] Also, as a heat dissipation means for the second liquid container,
It consists of a heat pipe inserted into a liquid container.

Furthermore, a Peltier element is connected to the liquid container as heat radiation means for the second liquid container.

0010

[Operation] With the above-described structure, the present invention can provide sufficient heat dissipation function without being constrained by optical design by guiding the heated liquid in the first liquid container into the second liquid container and dissipating the heat. It is possible to have

[0011]

Embodiments Examples of the present invention will be described below with reference to FIGS. 1 to 7. Note that the same reference numerals are used for the same components as in the conventional example.

FIG. 1 is a sectional view showing essential parts of an embodiment of the present invention. A first liquid container made up of a cathode ray tube 1, a projection lens 2, and a container 4, and a second liquid container made up of a container 5 provided above with radiation fins are communicated through liquid passages 6 and 7. A transparent liquid 3 is filled in each liquid container. During image reception, the liquid 3 in the container 4 heated by the cathode ray tube 1 expands in volume, becomes lighter in specific gravity, rises, and is introduced into the container 5 through the liquid passage 6 provided above the container 4. It will be destroyed. In the container 5, the heat of the liquid 3 is dissipated by the radiation fins, and as the temperature of the liquid 3 decreases, its specific gravity increases, and the liquid 3 is guided back to the liquid container 4 through a liquid passage 7 provided below the container 5. There, it is heated again by the cathode ray tube 1. In this way, the liquid 3 circulates between the containers 4 and 5 by natural convection, forming a heating/cooling cycle, thereby enabling efficient heat dissipation.

FIG. 2 is a sectional view showing the main parts of a second embodiment of the present invention. In place of the cathode ray tube in the first embodiment, a liquid crystal panel 8 is used as a receiver. light source 10
The light passes through the field lens 11, the polarizing plate 9, and the liquid crystal panel 8, and is enlarged and projected. At this time, the polarizing plate 9
Since the liquid crystal panel 8 and the liquid crystal panel 8 become heat sources, a first liquid container is formed by the field lens 11, the liquid crystal panel 8, and the container 4, and a second container 5 is made up of a container 5 having a heat dissipation fin provided above the first liquid container. By moving the liquid 3 back and forth between the liquid container and the liquid container, a heating/heat radiation cycle is formed.

FIG. 3 shows an embodiment in which a heat pipe is used as the heat radiation means for the second liquid container. The liquid 3 in the container 5 directly contacts the heat absorption part of the heat pipe 12 and transfers heat to the heat pipe 12.
The heat is released to the outside of the container 5 and is efficiently radiated.

FIG. 4 shows an embodiment in which electronic cooling using a Peltier element is used as heat dissipation means for the second liquid container. The container 5 is in contact with the endothermic side of the Peltier element 13, and the heat of the liquid 3 is released to the heat generating side of the Peltier element through the container 5, and is efficiently radiated.

[0016] Since the second liquid container is not subject to optical design restrictions on its position, it can be brought to any position above the first liquid container. Therefore, as shown in FIGS. 5 to 7, it is possible to enhance the heat radiation effect by placing it near the heat radiation hole 15 of the cabinet 14, near the fan 16, or further outside the cabinet 14.

[0017]

As is clear from the above embodiments, according to the present invention, it is possible to provide a projection type receiver having a sufficient and efficient heat dissipation function without being subject to any restrictions on optical design.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the main parts of the first embodiment of the device of the present invention.

[Fig. 2] A cross-sectional view showing the main parts of the second embodiment of the device of the present invention.

FIG. 3 is a sectional view showing a liquid container of a third embodiment of the device of the present invention.

FIG. 4 is a sectional view showing a liquid container of a fourth embodiment of the device of the present invention.

[Fig. 5] Cross-sectional view of main parts in the fifth embodiment of the device of the present invention

[Fig. 6] A cross-sectional view of essential parts in a sixth embodiment of the device of the present invention.

[Fig. 7] Cross-sectional view of main parts in the seventh embodiment of the device of the present invention

[Fig. 8] A cross-sectional view showing the main parts of a conventional projection receiver.

[Explanation of symbols]

1 Cathode ray tube 2. Projection lens 3 Transparent liquid 4 Container 5 Container 6 Liquid passage 7 Liquid passage 8. LCD panel 9 Polarizing plate 10 Light source 11 Field lens 12 Heat pipe 13 Peltier element 14 Cabinet 15 Heat radiation hole 16 Fan 17 Heat sink

Claims (7)

[Claims] Claim 1: A first liquid container filled with liquid is formed in a space between a face surface of a cathode ray tube and a projection lens disposed in front of the face surface of the cathode ray tube, and a first liquid container is provided above the first liquid container. A projection type receiver that is connected to a second liquid container having a heat dissipating means through one or more liquid passages. 2. A first liquid container filled with liquid is formed in a space around the liquid crystal panel and the polarizing plate, and a second liquid container has a heat dissipation means provided above the first liquid container. A projection type receiver connected to the projector by one or more liquid passages. Claim 3: In either claim 1 or 2, the second
A projection type image receiver characterized in that a heat pipe is inserted and installed in a liquid container as a heat dissipation means for the liquid container. Claim 4: In either claim 1 or 2, the second
A projection type image receiver characterized in that a Peltier element is connected to a liquid container as a heat dissipation means for the liquid container. Claim 5: In either claim 1 or 2, the second
A projection type receiver characterized in that a liquid container is arranged near a heat radiation hole of a cabinet. Claim 6: In either claim 1 or 2, the second
A projection type receiver characterized in that a liquid container is placed near a fan. Claim 7: In either claim 1 or 2, the second
A projection type receiver characterized in that all or a part of the liquid container is disposed outside the cabinet.