JPS612247A - Picture tube of liquid-cooling projection type - Google Patents

Abstract

PURPOSE:To improve the efficiency of assembling a picture tube of the liquid- cooling projection type and achieve uniform adhesive force by installing a spacer only in the adhesive layer located between the picture tube and a radiator plate. CONSTITUTION:After a radiator plate 3 is installed outside the panel 1a of a picture tube 1 with an adhesive layer 2 and a corner spacer 7 installed in the adhesive layer 2 interposed, a transparent plate 5 is installed over the plate 3 with an adhesive layer 4 interposed. Next, a jig 10 with a given dimensions having a radiator-plate-receiving surface 10a and a transparent-plate-receiving surface 10b is placed on the transparent plate 5 and then pressed toward the panel 1a. When the surface 10a touches the plate 3, the adhesive layer 4 is pressed into a given restricted thickness. And, when the jig 10 is further pressed toward the panel 1a, the adhesive layer 2 is compressed until its thickness becomes that of the spacer 7. Because of the above structure, it is only necessary to install the spacer 7 in the adhesive layer 2. Furthermore, since the adhesive layer 4 does not contain any spacer, the width of the adhesive layer 4 becomes uniform.

Description

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

[Background of the invention]

In a projection type cathode ray 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.
The large amount of heat generated at the phosphor surface is not very well conducted to other parts of the cathode ray tube, and the temperature at the center of the panel rises significantly during continuous operation. 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 cope with this problem, a liquid-cooled projection type cathode ray tube is known in which the panel surface is cooled with a refrigerant liquid such as an ethylene glycol solution, as shown in FIGS. 1 and 2. That is, a cathode ray tube 1 and a transparent plate 5 are fixed to each other, and a refrigerant liquid 6 is sealed in a space between the panel 1a and the transparent plate 5.

Therefore, the heat on the front surface of the panel 1a is transmitted to the heat sink 3 by the convection of the refrigerant liquid 6, and is radiated to the outside from the heat sink 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, such a liquid-cooled projection type cathode ray tube uses adhesive 2.
．． In order to regulate the thickness of the adhesive 2.4, spacers 7.8 are placed at four points at each corner of the adhesive 2.4, ie, at eight points in total. Since a large number of spacers 7, 8 must be arranged in this manner, workability is poor. Also, in the area where spacer 7.8 is present, adhesive 2 is applied for the spacer 7.8.
．． Since the width of 4 is reduced, the adhesive force is uneven and it is easy to peel off.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid-cooled projection type cathode ray tube that can improve workability and make adhesive strength uniform.

[Summary of the invention]

In order to achieve the above object, the present invention fixes a heat sink to the outside of a cathode ray tube panel with an adhesive, further fixes a transparent plate on the heat sink with an adhesive, and connects the cathode ray tube panel with the transparent plate. The liquid-cooled projection type cathode ray tube in which a refrigerant liquid is sealed in each space is characterized in that a spacer is disposed only in the adhesive between the cathode ray tube and the heat sink.

An embodiment of the present invention will be described below with reference to FIG. Note that the same members as in FIG. 1 will be described with the same reference numerals. First, the heat sink 3 is placed on the outside of the panel 1a of the cathode ray tube 1 through the adhesive 2 and the spacer 7 placed in the corner of the adhesive 2, and then the adhesive 4 is placed on the heat sink 3. A transparent plate (/- plate 5) is disposed through the plate.The adhesive 2.4 is slightly thicker than a predetermined thickness.Next, a heat sink plate receiving surface 1°a and a transparent plate receiving surface lOb are provided. Then, a jig 1o is placed on the heat sink 3 and the transparent plate 5, and the jig 1o is set so that the distance between the heat sink receiving plate 10a and the transparent plate receiving surface 1.Ob is a predetermined dimension. Press it against the panel Ia side.As mentioned above, since the adhesive 4 is provided thicker than the predetermined thickness, there is a gap between the heat sink 3 and the heat sink receiving surface 10a, and the jig 1° is pressed against the panel la side. When pressed, first the transparent plate 5 is pressed and the adhesive 4 is crushed, and when the heat sink receiving surface 10a comes into contact with the heat sink 3, the adhesive 4 is regulated to a predetermined thickness.When the jig 10 is further pressed, adhesive 4
The heating plate 3 with a predetermined thickness is pushed toward the panel Ia, and the adhesive 2 is crushed until it reaches the thickness of the spacer 7.
The adhesive 2 is regulated to a predetermined thickness.

In this way, the thickness of the adhesive 4 can be regulated without providing a spacer in the adhesive 4.

Therefore, the spacer attachment process only needs to be done in the adhesive 2, and the spacer attachment process is halved. Further, since there is no spacer in the adhesive 4, the width of the adhesive 4 becomes uniform, and the adhesive strength of the transparent plate 511Ill is improved.

FIG. 4 shows another embodiment of the invention. When the lug attachment part 3a is integrally formed on the heat sink 3, by providing the jig 10 with a pin 10C that is inserted into the lug attachment hole 3b, in addition to the effect of the above embodiment, the tube of the heat sink 3 can be fixed. This provides the effect of correcting the position in the direction perpendicular to the axis.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the spacer is provided only in the adhesive area between the cathode ray tube and the heat sink, so workability is improved and the transparent plate side Uniform adhesive force can be achieved.

[Brief explanation of drawings]

Figure 1 is a sectional view of the main part of the conventional example, and Figure 2 is A-A in Figure 1.
3 is a cross-sectional view of a main part showing one embodiment of the present invention, and FIG. 4 is a cross-sectional view of a main part showing another embodiment of the present invention. 1... Braun tube, 1a゛°・Panel, 2... Adhesive, 3... Heat sink, 4... Adhesive,
5...Transparent plate, 6...Refrigerant liquid, 7
．． 8. Spacer. Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] A heat sink is fixed to the outside of the cathode ray tube panel via adhesive, a transparent plate is further fixed onto the heat sink via adhesive, and a refrigerant liquid is sealed in the space between the cathode ray tube panel and the transparent plate. In liquid-cooled projection cathode ray tubes,
A liquid-cooled projection type cathode ray tube, characterized in that a spacer is provided only in an adhesive portion between the cathode ray tube and the heat sink.