JPS593851A - Method for manufacturing explosionproof cathode ray tube - Google Patents

Abstract

PURPOSE:To weld lugs correctly at predetermined positions in the process to fix the lugs to a tension band or a heat-shrunk band fitted around the sides of a panel of a cathode ray tube, by non-contact heating with a laser beam or the like. CONSTITUTION:The tension band 12 is fitted around the sides of the cathode ray tube panel 11, and then, a lug 13 is fixed by laser welding to the band at the position corresponding to each of four corners of the panel, after being correctly positioned by means of a jig. Namely, the lag 13 is provided with a hole 14 at the position where it is welded to the band 12, and the welding is performed by applying laser beams at the circumferential edge of the hole 14 and the side edge 15 of the lug. By welding in this way, input of the laser beam is limited to a small local portion and the welding is performed without making contact with the members to be welded, the lug can be securely welded to the band and no damage is caused on the panel. Since the lugs can thus be fixed to the correct positions, there is no annoyance to be caused when the cathode ray tube is mounted on the cabinet or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing an explosion-proof cathode ray tube, and in particular to a method for accurately attaching lugs to a tension band or a shrink-fit band attached to the outer periphery of a side surface of a cathode ray tube panel. Regarding how to attach.

"Technical background of the invention and its problems" Cathode ray tubes generally implode due to external impact, and various methods are used to prevent this implosion. A widely used method is to securely fasten a metal strip to the outer peripheral side of the To mount such a cathode ray tube in a television receiver cabinet, etc., attach lugs with mounting holes to the four corners of the metal strip panel, and insert mounting tools such as screws into these mounting holes. This is done by inserting.

Conventionally, various methods have been used to attach metal strips or lugs to the outer peripheral side surface of a cathode ray tube panel. That is, for example, as shown in Fig. 1, a lug (2) is welded in advance to the rim hand (1) as a reinforcing plate, and this is attached to the outer peripheral side of the cathode ray tube panel (3), and then the lug (2) is attached from above. Tighten with the metal tension band (4). in this case,
When attaching the rim band to the outer peripheral side of the panel, it is difficult to weld the lugs to the rim band so that the lugs are positioned exactly at the four corners of the panel, and the lugs may shift when wrapping the tension band. Because of the lugs, they get caught and don't adhere well, resulting in no tension.

Additionally, as shown in Figure 2, a lug (7) is welded in advance to a ring-shaped tension band (6) made of metal strip to match the shape of the cathode ray tube panel (3). After heating and expanding, it is attached to the panel (3), fluidized and contracted, and then tightened with a band. In this case, the lugs are deformed due to hot processing, and precision is required for welding the tension band and the lugs for trench fit.
This often causes variations when worn, and the band needs to be shaped, which is time-consuming.

There was a problem in that some items could not be attached to the specified holes when attached to a web net, etc.

"Object of the Invention" The present invention is conceived in view of these points,
Cathedral punishment! The object of the present invention is to provide a method for attaching a tension band or a shrink-fit band to the outer periphery of the side surface of a tube panel, and then accurately attaching lag to these bands.

"Summary of the Invention" After attaching a tension band or a shrink-fit band to the outer circumferential side of a panel of a cathode ray C, the parts of the band corresponding to the four corners of the panel are heated in a predetermined manner by non-contact heating using a laser or the like. I'41: A method for manufacturing an explosion-proof cathode ray tube, which is characterized in that the lugs are ripened.

[Practice of the Invention fll-1 Practical Example 1 An example of the present invention will be described below with reference to the drawings. As shown in Figure 3, wrap the tension band A21f around the outer periphery of the side surface of the cathode ray tube panel αυ and attach it. After accurate positioning, welding is performed using a laser. The state is shown in FIG. In other words, the part of the lug (13
The edges of the holes 14) and the edges (15) of the lugs are irradiated with a laser and welded.

When welding is performed in this manner, the laser input is locally limited and welding can be performed without contacting the object to be welded, so that welding can be performed accurately on the band and the panel of the cathode ray tube will not be damaged. Since the cathode ray tube can be mounted accurately in a predetermined position in this manner, no trouble occurs when the cathode ray tube is mounted in a cabinet or the like.

Example 2, M5 As shown in figure M5, the lug c22 welded to the band (21) has a loose fit hole (2,
1 is drilled, and such a lug (221) is welded to the band using a laser in the same manner as in the previous example.Next, using a jig, a small hole with a predetermined hole diameter 05 is drilled as shown in FIG. Plate 1241 into the loose fitting hole? Overlap the 'll part and weld and fix it so that it forms a lug with a predetermined hole diameter. (The welding points are indicated by an x.) With the lugs attached in this way, the small plates can be attached to the lugs by resistance welding very easily, and the electrodes can be attached to the parts of the lugs that are not fixed to the band. Since the laser is applied only to the laser beam, no scratches are caused to the panel, and since the lug is rotated by the laser to the band in the same way as in the previous example, there is no need to cause any scratches to the pile. Therefore, since a lug with a hole diameter of Jjl is molten,
The cable can be attached to a cabinet or the like without any problems.

In the above example, the lug was welded to the band using a laser, but the lug is not limited to this, and 1(L'δ, R) can be similarly applied by non-contact heating such as micro plasma.Also, in the case of a shrink-fit band, You can also attach one lug in the same way.

``Effect of the invention'' According to the method of failure 1, cathode rays! - By attaching a tension band or a vertical band to the outer periphery of the side panel of the panel, it is possible to accurately melt the lugs on the band portions corresponding to the four corners of the panel, and the said band can be attached vertically. A good one-way explosion effect can be obtained by tightening the tube firmly, and the cathode ray tube can be easily installed in a predetermined position in a cabinet or the like without affecting the explosion-proof effect.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a state in which metal strips and lugs are attached to the outer periphery of the side surface of a conventional cathode ray tube panel, FIG. 3 is an explanatory diagram of an embodiment of the present invention, and FIG. 4 is an explanatory diagram of the present invention. FIG. 5 is a front view of a lug portion in another embodiment of the present invention, and FIG. 6 is an enlarged explanatory view of the lug. DESCRIPTION OF SYMBOLS 11... Cathode ray tube panel, 12... Tension band, 13... Lug, 14... Lug attachment hole to band, 22... Lug, 23... Lug loose fitting hole, 24
...Small plate with a predetermined hole diameter. Agent Patent Attorney Inoue - Male Figure 1 Figure 2 Figure 38! J

Claims (3)

[Claims] (1) A tension band or a shrink-fit band is attached to the outer periphery of the side surface of the panel of the cathode ray tube, and then lugs are welded to the band portions corresponding to the four corners of the panel by non-contact heating. Method for manufacturing explosion-proof cathode ray tubes. (2) The method for manufacturing an explosion-proof cathode ray tube according to claim 1, wherein the tension band t& is a lug welded to a predetermined position of the shrink-fit band using a laser. (3) The first aspect of the present invention is characterized in that lugs with loosely fit holes are attached to a tension band or a shrink-fit band, and then a small plate having a predetermined hole diameter is welded to each lug. A method for manufacturing an explosion-proof cathode ray tube as described in .