JPS5837660B2 - cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube having an external magnetic shield case.

As shown in FIG. 1, there is a conventional cathode ray tube in which a cathode ray tube body 1 is potted inside an external magnetic shield case 4.

This potting is performed according to the following steps.

First, the filter 7 is attached to the face surface of the cathode ray tube body 1 via the PPG resin 8.

The external magnetic shield case 4 has a structure that can be separated into a front half 4a and a rear half 4b at the portion where the deflection yoke 2 is located, and the joint portion 4c can be connected with screws or the like.

Next, as shown in FIG. 2, with the filter 7 facing down, foam tape 5 is adhered to the outer periphery of the cone of the cathode ray tube body 1 and the inner wall of the external magnetic shielding case 4a, and then both , 4a are combined.

Next, the cathode ray tube main body 1 and the external magnetic shield case 4a
After confirming that the desired positional relationship is achieved, the curable silicone resin 6 is injected from the opening in the joint 4c of the magnetic shield case 4a in the front half.

Note that 3 is a network assembly.

Here, the foam tape 5 is used to prevent the resin 6 from leaking to the filter T side when the resin 6 is injected.
It is necessary to wrap it around the inner wall of the external magnetic shield case 4a about four times.

For this reason, the processing is also done manually, and the workability is extremely poor.

Furthermore, depending on the way the foam tape 50 is wound, the seal between the cathode ray tube body 1 and the external magnetic shield case 4a may not be completely sealed, and the resin 6 may leak out from the gap between the foam tapes 5.

The present invention was made to eliminate the above-mentioned drawbacks of the conventional art, and aims to provide a cathode ray tube that is easy to work with and can reliably prevent resin leakage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 shows a molded elastic body 9 such as a sponge,
This elastic body 9 has an external shape similar to that of the external magnetic shield case 4.
The hole 9a provided on the inside is shaped to match the shape of the inner wall of the cathode ray tube body 1 (see FIG. 5).

FIG. 4 shows a modification of the elastic body 9, which is molded to suit a case where the inner wall of the external magnetic shielding case 4a has a conical shape.

FIG. 5 shows a state in which the elastic body 9 is inserted into a space 10 formed between the cathode ray tube body 1 and the external magnetic shield case 4a.

With the filter 70 of the cathode ray tube body 1 having been installed facing downward, the elastic body 9 is inserted into the neck portion 1b through the hole 9a of the elastic body 9, and the elastic body 9 is inserted into the outer surface of the funnel cone portion 1a. Bring it into close contact.

Then, when the external magnetic shielding case 4a is fitted from above, the elastic body 9 corresponding to the shape of the space 10 between the cathode ray tube main body 1 and the external magnetic shielding case 4a is inserted into this space 10. become.

Thereafter, the steps up to filling the remaining space with silicone resin are similar to those of the conventional method shown in FIG.

When the remaining space is filled with resin in this way, the elastic body 9 can prevent the resin from leaking.

Here, in order to completely eliminate leakage, the thickness of at least a portion of the elastic body 9 is made larger than the dimension of the space 100 between the cathode ray tube body 1 and the external magnetic shield case 4a, so that the elastic body 9 What is necessary is to press it into the part 10 in a compressed state.

As described above, according to the present invention, by using an elastic body having a shape corresponding to the shape of the space between the cathode ray tube body and the external magnetic shielding case, it is possible to wrap the foam tape as in the conventional method. This saves time and work, greatly improves work efficiency, and more reliably prevents resin leakage.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional cathode ray tube, Fig. 2 is a sectional view of the cathode ray tube of Fig. 1 before resin injection, Fig. 3 is a perspective view of an elastic body, and Fig. 4 is a sectional view of an elastic body. FIG. 5 is a perspective view showing a modified example, and is an exploded view of the cathode ray tube of the present invention before resin injection. 1... Cathode ray tube body, 4... External magnetic shield case 9... Elastic body, 10...
...Space section. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a cathode ray tube having an external magnetic shield case, a space formed between the external magnetic shield case and the cathode ray tube body that corresponds to the outer periphery of the cone portion of the cathode ray tube body. An elastic body having a shape corresponding to the shape of this space is inserted into the space formed between the inner wall of the external magnetic shield case and the remaining space is filled with a hardening fluid material. Characteristic cathode ray tube. 2. The cathode ray tube according to claim 1, wherein the elastic body is a sponge. 3. Claim 1, wherein the elastic body has at least a part of the thickness larger than the dimension of the space.
Cathode ray tube as described in section.