JPS6164052A - Liquid cooling system projection type picture tube - Google Patents

Abstract

PURPOSE:To increase brightness of a phosphor while suppressing temperature rise of a panel by fixing a radiation plate while making it to contact with the base for mounting a cathode-ray tube in order to further improve thermal radiation from the base for mounting the cathode-ray tube. CONSTITUTION:A radiation plate 10 is in the shape of a wide frame seen from the side of a transparent plate 5 while being provided with lug holes 10a on the four corners and the radiation plate 10 is made to directly contact with the base for mounting a cathode-ray tube for being fixed to the base for mounting the cathode-ray tube while inserting screws into the lug holes 10a for tightening. In this way, by contacting with the radiation plate 10 and the base 8 for mounting the cathode-ray tube while setting up a contact area sufficiently large, the heat of the radiation plate 10 is fully thermally conducted to the base for mounting the cathode ray-tube so that the heat from the panel 1a is radiated extremely good through the radiation plate 10 and the base 8 for mounting the cathode-ray tube.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a liquid-cooled projection picture tube.

[Background of the invention]

In a projection type picture tube, in order to obtain a high-brightness image, the energy of the electron beam directed toward the fluorescent surface formed on the panel of the cathode ray tube is increased, so the amount of heat generated by the fluorescent surface is large.

On the other hand, the panel coated with phosphor (usually glass is used, and the thermal conductivity of glass is very low), so a large amount of heat generated on the phosphor surface is not very well conducted to other parts of the cathode ray tube. During continuous operation, the temperature at the center of the panel increases significantly. This significant temperature increase causes a decrease in the brightness of the phosphor, and the significant temperature difference between the center and the periphery1 of the panel increases the distortion of the panel. l), panel cracks sometimes occur.

In order to deal with this problem, a liquid-cooled projection picture tube has been known in which the panel surface is cooled with a refrigerant such as an ethyl-V glyconyl solution, as shown in FIGS. 1 and 2. FIG. 2 shows an enlarged view of the main part of FIG. 1. That is, the outside ξ of the panel 1a of the cathode ray tube 1 whose interior is evacuated to a high vacuum
A heat dissipation plate 3 in the form of a metal ring is adhered to the heat dissipation plate 3 via a silicone adhesive 2, a transparent Punto 5 is adhered to the heat dissipation plate 3 via a silicone adhesive 4, and a refrigerant liquid is applied to the space between the panel 1a and the transparent plate 5. 6 (for example, JP-A-53-140
Publication No. 931).

Therefore, when the projection picture tube is operated, as the temperature of the panel 1a rises, convection 7 occurs between the refrigerant liquid 6) and the refrigerant f
6 is transferred to the heat sink 3, and the heat sink 3 and the outside t
This heat is dissipated. Therefore, the temperature rise in the central part of the panel 1a is reduced, the decrease in brightness is also reduced, and the occurrence of panel cracks is also prevented. The temperature of the projection picture tube is determined by the heat dissipation characteristics of the heat dissipation plate 3. Therefore, if the heat dissipation characteristics of the heat dissipation plate 3 are good, it becomes possible to flow a large amount of beam current, and a brighter image can be obtained.

Further, as shown in FIG. 3, a projection type picture tube is usually attached to a base 8 of a television set using screws 9 through lug portions 3aj provided on the heat sink 3#. The base 8 for mounting the cathode ray tube is often made of metal, and heat is also radiated from the base 8 through the screw 9. However, in this structure, the heat of the heat sink 3 is transmitted to the base 8 through the screws 9, so that the effect of heat radiation from the base 8 when the cathode ray tube is mounted is small.

[Purpose of the invention]

The purpose of the present invention is to provide a high-performance liquid-cooled projection picture tube by improving the heat dissipation from the base of the cathode ray tube, controlling the temperature rise of the panel, and increasing the brightness of the phosphor. I have something to do.

[Summary of the invention]

In order to achieve object E, the present invention is characterized in that the heat sink is fixed in contact with the base of the cathode ray tube.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5. Note that the same or equivalent members as in FIGS. 1 to 3 are given the same reference numerals, and their explanations will be omitted. The heat sink 10 has a frame shape that is wide when viewed from the transparent plate 5@, and has square lug holes 10a.When mounting the heat sink 10 on the cathode ray tube, the heat sink 10 is placed in direct contact with the base 81, and screws (not shown) are inserted into the lug holes 10a. ) and tighten it to attach the CRT to the base 8t.
This is fixed.

In this way, the heat sink 10 and cathode ray tube are mounted on the base 8.
By making contact with the panel 1a and setting the contact area to be sufficiently large, the heat of the heat sink 10 can be sufficiently conducted to the base 8 when the CRT is mounted.
0 and the cathode ray tube mounted on the base 8, heat is dissipated extremely well.

FIG. 6 shows another embodiment of the invention. In this embodiment, a convex portion 10a is provided on the heat dissipation plate 10, and a recess 8a into which the convex portion 10a fits is provided on the base 8 for mounting the cathode ray tube, and these concave and convex portions are combined. When formed in this way, the heat sink 1
0 and a cathode ray tube are installed, the contact area with the base 8 is further increased, and the heat dissipation effect is further increased.

In each of the above embodiments, a higher heat dissipation effect can be obtained by applying a heat diffusion compound, such as Shin-Etsu Chemical Exhibition KS-6091, to the heat dissipation plate 10 (between the cathode ray tube and the base 8). When mounting a cathode ray tube, the horizontal axis is the contact area between the base 8 and the heat sink 10, and the temperature at point A (not shown in Figure 4) is measured.The conditions at this time are: Well, the anode is KE28KV.
, beam 11 flow 430μA1-1 9-size 5'
(102 x 76 m), and the cathode ray tube was installed between the base 8 and the heat dissipation plate 107 using the heat diffusion compound 8-609 at the Shin-Etsu Chemical Exhibition.

As is clear from Figure 7, the cathode ray tube is mounted on base 8.
When the contact area of the heat dissipation plate 10 is zero, the temperature is 83"C, but when the contact area is 26.2-, it is 65"C,
A temperature reduction of 18°C was achieved.

〔Effect of the invention〕

As is clear from the above explanation; according to the present invention,
Since the temperature of the cathode ray tube can be further reduced, a brighter screen can be obtained, and a brighter, higher contrast screen can be obtained on the screen of a projection television set.

[Brief explanation of the drawing]

Fig. 1 shows a conventional liquid-cooled projection picture tube, ta) is a front view, (b) is a partial side view, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 Figure 1 is a side view of the liquid-cooled projection picture tube with the cathode ray tube attached to the base.
FIG. 4 shows an embodiment of a liquid-cooled projection picture tube according to the present invention; (a) is a top view; b) is a side view; FIG. 5 is a sectional view of the main part of FIG. 4; FIG. 6 is a side view showing another embodiment of the present invention, and FIG. 7 is a contact! FIG. 3 is a temperature characteristic diagram showing the relationship between product and temperature. ■...Cathode ray tube, 1a...Panel, 2.4...
・・Silicone adhesive, 5.・Transparent plate, 6・
Refrigerant liquid, 8...Cathode ray tube installation base, 10
...heat sink.

Claims (1)

[Claims] A metal heat sink and a transparent plate are sequentially fixed to the outside of the cathode ray tube panel via adhesive, and a refrigerant is sealed in the space between the panel and the transparent plate, and the mounting lug portion provided on the heat sink is A liquid-cooled projection picture tube fixed to a cathode ray tube mounting base, characterized in that the heat sink is fixed in contact with the cathode ray tube mounting base.