JPH05174735A - Cathode-ray tube reinforced with band - Google Patents

Abstract

PURPOSE:To provide an excellent implosion preventive effect by refraining from any joint in a ring-shaped metal band frame of a band-reinforced cathode- ray tube, and thereby dispersing the fastening force over the whole wall. CONSTITUTION:A metal band frame 6 of a surface-treated steel plate or stainless steel plate is formed in a ring while no joint is formed, wherein the plate thickness ranges between 0.4-1.6mm. The force of fastening generated in the metal band frame 6 after it is mounted on a cathode-ray tube by means of hot fitting is thereby dispersed over the whole wall of the metal band frame 6, which permits increasing the fastening force of the metal band frame. This allows providing a fastening force satisfactorily responding to large size constructing of cathode-ray tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band-reinforced cathode ray tube.

[0002]

2. Description of the Related Art FIG. 3 is a side view showing a conventional band-reinforced cathode ray tube. In the figure, 1 is a cathode ray tube, 1a is a panel face portion of the cathode ray tube 1, 1b is a panel skirt portion, 2 is an annular metal band frame attached by shrink fitting to the outer peripheral edge of the panel skirt portion 1b, and the cathode ray tube 1 is attached thereto. An L-shaped fitting 3 having a hole for fixing it to a frame (not shown) is attached by spot welding or the like, and its joint 4 is spot welded 5 to form an annular shape as shown in FIG. Is formed in.

Conventionally, as a measure to prevent the implosion of the cathode ray tube 1, a so-called shrink method has been adopted in which a panel skirt portion 1a of the cathode ray tube 1 is shrink-fitted with an annular metal band frame 2 for tightening (for example, JP-B-63-24290). No. publication). In this cathode ray tube 1, first, an annular thin metal band frame 2 having a uniform thickness and an inner peripheral length slightly shorter than the outer peripheral edge of the panel skirt portion 1b is stretched by heating to expand the panel skirt portion 1b of the cathode ray tube 1.
Panel skirt part 1b when it is fitted into the
It is manufactured so that the tightening force is applied to.

[0004]

Since the conventional band-reinforced cathode ray tube is constructed as described above, the weight of the cathode ray tube 1 increases proportionally as the shape of the cathode ray tube 1 increases, and the implosion phenomenon occurs. The collapsing force that occurs when presented is also increased. Therefore, it is necessary to counteract the tightening force of the annular metal band frame 2 and increase the tightening force. However, since the metal strip frame 2 is formed in an annular shape by the spot welding 5 having the joint portion 4, the tightening force of the metal strip frame 2 after being fitted into the cathode ray tube 1 is applied to the weld portion of the joint portion 4. Act intensively. Since the mechanical strength of the spot weld 5 part has its own limit, the spot weld 5 part is destroyed as the tightening force increases, and it is not possible to obtain a competing tightening force, which leads to an increase in size. There was a problem that it was not applicable.

The present invention has been made in order to solve the above problems, and the tightening force of a metal band frame attached by shrink fitting can be dispersed over the entire wall of the metal band frame, which has an explosion-proof effect. The purpose is to obtain an excellent band-reinforced cathode ray tube.

[0006]

The band-reinforced cathode ray tube according to the present invention is such that a joint is not formed in an annular metal band frame.

[0007]

In the present invention, since the joint portion is not formed in the annular metal strip frame, the tightening force by this metal strip frame after being attached to the CRT by shrink fitting is dispersed over the entire wall of the metal strip frame. To be done. Therefore, even if the tightening force of the metal strip frame increases, the metal strip frame does not break.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, 6 is a metal band frame formed in an annular shape so as not to form a joint, and is formed of, for example, a surface-treated steel plate or a stainless steel plate, and the plate thickness is also 0.4 m.
It is m to 1.6 mm. Since the other configurations are the same as those of the conventional one, the same reference numerals are given and the description thereof will be omitted.

With this structure, the tightening force acting on the metal strip frame 6 after being attached to the cathode ray tube 1 by shrink fitting is dispersed over the entire wall of the metal strip frame 6, so that the metal strip frame 6 is formed. It is possible to increase the tightening force.

Although the flat metal strip frame 6 is shown in the above embodiment, a metal strip frame 6A having a folded-back portion 6a formed at the end of the metal strip frame may be used as shown in FIG.

[0011]

As described above, according to the present invention, the tightening force of the metal band frame attached to the CRT by shrink fitting can be distributed over the entire wall of the metal band frame, so that the CRT can be sufficiently enlarged. It is possible to configure the tightening force that can be achieved, and there is an effect that an excellent explosion-proof effect can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a metal band frame showing an embodiment of the present invention.

FIG. 2 is a perspective view of a metal band frame showing another embodiment of the present invention.

FIG. 3 is a side view showing a conventional band-reinforced cathode ray tube.

4 is a perspective view showing the metal strip frame of FIG. 3. FIG.

[Explanation of symbols]

 1 Braun tube 1a Panel face part 1b Panel skirt part 3 Mounting bracket 5 Point welding 4 Joint part 6 Metal strip frame

Claims (1)

[Claims] 1. A band-reinforced cathode ray tube having a joint portion such as spot welding on an annular metal strip frame that is shrink-fitted to a cathode ray tube, wherein the joint portion is not formed on the annular metal strip frame. Characteristic band reinforced cathode ray tube.