JPS60227344A - Liquid cooling type projection picture tube - Google Patents

Abstract

PURPOSE:To improve reliability and heat radiation characteristic of bonding by providing a mounting lag of metal tightening belt to a heat sink and connecting a bracket and a heat sink with a thermal conductive member having small rigidity. CONSTITUTION:A positioning pad 12 is placed in contact with a heat sink 13 and a mounting lag 11a of metal tightening belt is fixed to the heat sink 13. Thereafter, a thermal conductive member 14 is attached to a metal bracket 10 and the heat sink 13. The weight of a CRT tube 1 and members attached to the CRT1 is supported by the mounting lag 11a and no weight is applied to the bonding surface 15 between a panel 1a and the metal bracket 10. Therefore, reliability of bonding agent 2 is improved. Since the metal bracket 10 and heat sink 13 are connected by the thermal conductive member 14 in such a way that any force is not applied to the metal bracket 10. Therefore, heat of metal bracket 10 is effectively transferred to the heat sink 14 through the thermal conductive member 14.

Description

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

[Background of the invention]

In a projection picture tube, in order to obtain a high-brightness image, the energy of the electron beam directed toward the fluorescent surface formed on the cathode ray tube panel is increased, so the amount of heat generated at the fluorescent surface is large. On the other hand, panels coated with phosphors are usually made of glass, and the thermal conductivity of glass is relatively low, so a large amount of heat generated on the phosphor surface is not conducted to other parts of the cathode ray tube. During continuous operation, the temperature in 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 peripheral areas of the panel increases distortion of the panel, sometimes causing panel cracks.

In order to deal with this problem, a liquid-cooled projection type bone tube is conventionally known, as shown in FIG. 1, in which the panel surface is cooled with a refrigerant such as an ethylene glycol solution. That is, a metal bracket 3 having a mounting lug 3a is fixed to the outside of a panel 1a of a cathode ray tube 1 whose interior is evacuated to a high vacuum via a silicone adhesive 2.
A transparent plate 5 is fixed thereon via a silicone adhesive 4, and a refrigerant 6 is sealed in the space between the panel 1a and the transparent plate 5.

Therefore, the heat at the front surface of the panel 1a is transmitted to the metal bracket 3 by the convection of the coolant 6, and is radiated to the outside from the metal bracket 3. 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.

By the way, the function of the metal bracket 3 is that since the metal bracket 3 is provided with the mounting lug part 3a, in addition to the above-mentioned heat dissipation function, the metal bracket 3 has a function and a fluorescent surface to focus the image on the screen. It has a positioning function to set it at a predetermined position.

Therefore, the weight of the cathode ray tube 1, the components built into the cathode ray tube 1, and accessories such as the deflection yoke attached to the outside of the cathode ray tube 1 is added to the silicone adhesive 2, causing the silicone adhesive 2 to peel off. There was a risk that I would get caught. Furthermore, the surface area of the metal bracket 3 cannot necessarily be sufficiently secured due to various constraints from the cabinet, and the mounting lug portion 3a
The heat dissipation from the metal bracket 3 was not always satisfactory because the amount of heat transferred from the metal bracket 3 to a heat sink such as a metal mounting frame provided in the cabinet by conduction was not necessarily sufficient.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid-cooled projection picture tube that can improve the reliability of adhesion between a panel and a metal bracket and the heat dissipation characteristics from the metal bracket.

[Summary of the invention]

In order to achieve the above object, the present invention attaches a metal strap having a mounting lug to the outer periphery of the panel, provides a positioning butt to the funnel part of the cathode ray tube, and brings the positioning pad into contact with the positioning part of the heat sink. The mounting lug portion is attached to the heat sink, and the bracket and the heat sink are connected by a heat conductive piece having low rigidity.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. Note that the same members as in FIG. 1 are given the same reference numerals, and their explanations will be omitted. The metal bracket 1o is not provided with a mounting lug portion, and a metal strap 11 having a mounting lug portion 11a is attached to the outer periphery of the panel 1a of the cathode ray tube 1 by shrink fitting or the like. Further, a positioning pad 12 is attached to the funnel 1b of the cathode ray tube 1, and when the positioning pad 12 is brought into contact with a heat sink 13i such as a metal mounting frame attached to a cabinet, the panel 1a
The distance between the luminescent surface IC and the projection lens (not shown) is a predetermined distance.

Further, the metal bracket 10 and the heat sink 13 are attached with an adhesive or the like with a heat conductive piece 14 such as a low-rigidity aluminum foil with a slack so that no force is applied to the metal bracket 10.

Therefore, the positioning pad 12 is brought into contact with the heat sink 13, and the mounting lug portion 11a is fixed to the heat sink 13. Thereafter, the heat conductive piece 14 is attached to the metal bracket 10 and the heat sink 13.

In this way, the metal strap 11 attached to the outer periphery of the panel 1a
The weight of the cathode ray tube 1 and the members attached to the cathode ray tube 1ζ is supported by the mounting lug portion 11aj, and the weight is not applied to the adhesive surface 15 between the panel 1a and the metal bracket 10, so that the reliability of the adhesive 2 is improved. improves. In addition, the metal bracket 10 and the heat sink 13 are connected by the heat conductive piece 14 so that no force is applied to the metal bracket 10, so the heat of the metal bracket 10 is efficiently transferred to the heat sink 14 by the heat conductive piece 14, and the heat dissipation properties are improved. is excellent. In addition, the projection lens and the fluorescent surface 1 are aligned by the positioning plate 12 provided in the funnel part 1b.
The distance to c can be set accurately to a predetermined dimension, improving the image quality on the screen.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the reliability of adhesion, heat dissipation characteristics, and image quality are improved.

[Brief explanation of drawings]

Figure 1 shows the main parts of the conventional example, (a) is a sectional view, (b)
2 is a front view, and FIG. 2 is a sectional view of a main part showing an embodiment of the present invention. 1... Braun tube, 1a... Panel, 1b...
・Funnel part, 2.4... Silicone adhesive, 5
...Transparent plate, 6...Refrigerant, 10...Metal bracket, 11...Metal strap, lla...Mounting lug portion, 12...Positioning butt, 13...
Heat sink, 14... Heat conductive piece, 15... Adhesive surface. Figure 1 (0) (b) Figure 2

Claims (1)

[Claims] In a liquid-cooled projection picture tube in which a bracket and a transparent plate are successively fixed to the outside of a cathode ray tube panel via an adhesive, and a refrigerant is sealed in a space between the panel and the transparent plate, a mounting lug is attached to the outer periphery of the panel. a metal strap having a section, and a positioning butt is provided on the funnel section of the cathode ray tube, the positioning butt is brought into contact with the positioning section of the heat sink, and the mounting lug section is attached to the heat sink, and the bracket and the heat sink are connected to each other. A liquid-cooled projection picture tube characterized in that the two are connected by a heat-conducting piece with low rigidity.