JPS58126647A - Explosion-proof cathode-ray tube - Google Patents

Abstract

PURPOSE:To omit the lap fusion between a metallic fastening band and a metallic shield band, which is used for shielding X-rays, by unifying the fastening band and the shield band together, and shaping the unified body into a frame- like member without forming any joint part between these bands. CONSTITUTION:The whole of a metallic fastening band 8 has a tapered part 9 in order to keep it away from the fused part 1a of a picture tube 1, and is unified with a metallic shield band 10 by pressing. Due to such a unifying press, the fastening belt 8 has no cut surfaces, and needs not to undergo any fusion. Since the fastening band 8 and the shield band 10 are unified together by means of the tapered part 9, there is no need to carry out fusion, and the work cost can be widely reduced. The fastening band 8, since it applies pressure homogeneously to the entire circumference of the picture tube 1, exhibits an excellent explosion-preventing effect, and improve the work efficiency. In addition, since the shield band 10 gives an effect of preventing the leakage of X-rays, such a cathode-ray tube is more excellent than the conventional one of a split type in terms of the appearance, work efficiency, the work cost and the explosion- preventing effect.

Description

[Detailed Description of the Invention] The present invention provides an adhesive layer on the maximum outer diameter part of a cathode ray tube, and firmly inserts a metal element around the outer periphery of the adhesive layer to prevent leakage. At the same time, the present invention relates to an explosion-proof cathode ray tube having a structure that prevents implosion of the cathode ray tube.

As shown in Figure 1, in a conventional explosion-proof cathode ray tube, an adhesive layer 2 made of adhesive tape or resin is formed on the outer periphery of the maximum outer diameter of a cathode ray tube 1 whose interior is evacuated to a high vacuum. A heated and expanded metal element 3 is inserted into the outer periphery of the tube by gas or electric heating, and then cooled and contracted to firmly tighten the maximum outer diameter part of the cathode ray tube 1. Weld and fix the metal mounting lugs 4 at the four corners of No. 3, and mark the outer circumferences of the metal mounting 3 and the metal mounting lugs 4 with an X! The structure is such that a metal shield band 5 for shielding I is welded and fixed to prevent implosion of the cathode ray tube.

The metal cable 1F3 is 11! It is common to have a structure in which a JC plate is cut and shaped into a frame shape, and only metal mounting lugs 4 are provided on the outer periphery of the structure. , as shown in Figure 2,
Since the overlapping portions 31.3b of the cut surface ends of the metal bracket 3 are welded and fixed, a gap 6.7 is created, and when the metal bracket 3 is inserted into the cathode ray tube l, the side surface 3C of the cathode ray tube of the metal strap 3 Concentrated compressive stress is applied to the cathode ray tube 1, and no stress is applied to the gap 7, which has the drawback that the effective area is reduced and sufficient explosion-proofing effect and uniform tension cannot be obtained.

Further, since the overlapping portions 3m and 3b of the metal base 3 have a welded structure, the processing cost becomes high. Furthermore, when inserting the metal device 3 into the cathode ray tube 1, the cut surface 3C comes into contact with the adhesive layer 2, making the insertion operation difficult.
This had the disadvantage of causing valve cracks.

Furthermore, as shown in FIG. 3, the overlapping portions 5a and 5b of the metal shield 5 have a welded structure, which has the drawback of increasing processing costs and reducing work efficiency.

The present invention was developed in view of the above-mentioned drawbacks of the prior art, and has no overlapping parts and no welding of metal parts, resulting in good appearance and handling, and uniform and sufficient compressive strength around the entire circumference of the cathode ray tube. However, it conforms well to the entire circumference of the cathode ray tube, has an excellent explosion-proof effect, and furthermore, the insertion work is easy and the material cost is reduced as there is no overlapping part, and at the same time there is no welding of the overlapping part. Furthermore, it is an object of the present invention to provide an explosion-proof IIM polar ray tube that can reduce the processing cost by eliminating welding between the metal base plate and the metal shield band, and which also prevents valve cracks from occurring.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 4 is a side vertical sectional view of a part of a corner of a cathode ray tube showing an embodiment of the present invention, and FIG. 5 is a front explanatory view. The cathode ray tube 1 and adhesive layer 2 are formed in the same manner as shown in FIG. The entire metal base 8 has a taper 9 to escape the welded part 1a of the cathode ray tube 1, and the metal shield band 1
0, and because of the integral press, there is no cutting surface of the metal base 8, and no welding is required. Furthermore, since the metal base plate 8 and the metal shield band 10 are integrated by the taper 9, welding is not necessary, and processing costs can be significantly reduced. Further, the metal base 8 applies pressure uniformly over the entire circumference of the cathode ray tube 1, and has an excellent explosion-proof effect and also has good workability. Furthermore, the metal shielding band 10 provides an effect of preventing X-ray leakage, and is significantly superior in terms of appearance, workability, processing cost, and explosion-proof effect compared to the conventional splitting method.

Figure #I6 shows another embodiment of the present invention.

FIG. 7 shows still another embodiment of the present invention, in which the metal device 12
, metal shield band 13, metal holding part 14, mounting lug 1
5 is integrated, and is formed by casting, casting molding, or a lost wax processing method. Since there is no overlapping portion in either case, pressure is applied uniformly over the entire circumference of the cathode ray tube, significantly increasing the explosion-proof effect and preventing valve cracks. Also, since the mounting lug 15 can be integrated,
Furthermore, there is no welding work, and processing costs can be reduced.

As is clear from the above description, according to the explosion-proof double cathode ray tube of the present invention, there is no overlap welding of the metal base and the metal shield band, and furthermore, the metal base and the metal shield band are integrated, so that welding does not occur. No work is required, the appearance and handling are good, there is no need to overlap the metal base plate and the metal shield band, and the material cost is reduced, and the metal base plate and metal shield band can be welded. Because there is no welding, processing costs are significantly reduced, and the metal placement is well compatible with the valve and adhesive layer, resulting in low cost and excellent explosion-proof effects. ! ! Not only does it have a leakage prevention effect, it also prevents valve cracks from occurring.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the corner of a conventional explosion-proof cathode ray tube, Figure 2 is a front view of the area around the joint of the metal element in Figure 1, and Figure 3 is the metal element in Figure 1. Fig. 2 is a front explanatory view of the vicinity of the joint on the opposite side, Fig. 4 is an explanatory longitudinal cross-sectional view of the main part of a corner showing an embodiment of the present invention, Fig. 6 and 7 are explanatory longitudinal cross-sectional views of corners showing other embodiments of the present invention, respectively. l... Braun tube, 2... Adhesive layer, 8.1
1,12...Metal device, 1O113...Metal shield band.

Claims (1)

[Claims] In an explosion-proof cathode ray tube in which a metal mounting and a metal shielding band for XMA shielding are provided on the outer periphery of the cathode ray tube via an adhesive layer, the metal mounting and the metal shielding band are integrally structured; An explosion-proof cathode ray tube that is shaped into a frame without any joints.