JPH0457062B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a support structure for a getter of a cathode ray tube, and particularly to a support structure suitable for attaching a getter to a funnel of a cathode ray tube.

[Prior art]

The getter of a cathode ray tube is installed inside the cathode ray tube to adsorb residual gas inside the tube and maintain a good degree of vacuum inside the tube.The getter of a cathode ray tube is usually installed inside a ring with a U-shaped cross section and BaAl ₄ inside. This is heated by induction in a vacuum to form a barium film that adsorbs gas on the inner surface of the cathode ray tube.

A cathode ray tube is made of glass, and as shown in Figure 1, it has a panel 1 that displays an image, a funnel 2, and a cylindrical neck 4 that houses an electron gun 3.
It consists of There are various methods of attaching a getter inside a cathode ray tube, some of which are shown in duplicate in FIG.

First, the getter 5A is attached to the tip of the electron gun 3. This method is easy to install, but
Since the barium film is formed on a small area near the getter and in a limited area in the center of the panel, there is a disadvantage that the gas adsorption capacity is relatively small.

In order to avoid the weak point of the Getter 5A, the Getter 5B is placed near the funnel 2 from the tip of the electron gun 3 by means of a spring 6. If it was made too long, it would become unstable, so it had some weaknesses, such as not being able to attach it too far from the net 4.

The getter 5C is attached by a spring 8 to a metal button 7 attached to the funnel 2 in order to establish electrical continuity between the inner and outer surfaces of the funnel 2 in order to avoid the weak points of the getters 5A and 5B. . However, since the button 7 is made of metal, when the getter 5C is inductively heated, the button 7 is also inductively heated at the same time, which may cause damage to the funnel 2. In order to avoid this, if the getter 5C is moved away from the button 7, the position becomes unstable and induction heating becomes difficult.

Getter 5D is Getter 5A, Getter 5B,
In order to avoid the weak points of the getter 5C, a getter support 10 made of a material such as ceramics is attached to the inner surface of the funnel 2 with an adhesive such as low melting point glass, and the getter 5D is attached to this.
For this purpose, conventionally, a support spring 12 is attached to the getter support plate 11 on which the getter 5D is attached, as shown in FIG. He supported Getztar 5D. However, in this method, the distance between the getter 5D and the funnel inner surface 2a is unstable, and the getter 5D
When induction heating is performed, the heating conditions are unstable and the amount of barium scattered becomes unstable.

[Purpose of the invention]

It is an object of the present invention to provide a getter support structure which improves the above-mentioned disadvantages.

[Summary of the invention]

The present invention provides for stabilizing the position of the getter with respect to the inner surface of the funnel by having the support spring clamp the getter support to support the getter, and by clamping the getter support between the support spring and the getter or the getter support plate. Features.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. As shown in FIG. 3, the support spring 22 has two functions. One function is to clamp and support the getter 5D in the circumferential direction by clamping the small diameter portion 10a of the getter support 10, similar to the support spring 12 shown in FIG.
As can be seen from the side view shown in FIG. 4, another function is that the getter support plate 21 and the support spring 22 support
b, that is, the getter 5D is held against the inner surface 2a of the funnel by holding it so that the getter 5D is not displaced in the direction parallel to the axis of the getter support 10.
This is a function to stabilize the position of D. In order to provide these two functions, the support spring 22 is constructed of a wire spring in the example shown in FIG.

In addition, the support spring 22 is Getter 5D.
In this configuration, the getter support 10 is held between the support spring 22 and the getter 5D, and the getter 5D is held so that it does not displace in the direction parallel to the axis of the getter support 10. Also, the getter support 10 does not need to be made of a two-layered cylindrical portion, and may be made of a square tube.

〔Effect of the invention〕

As described above, according to the present invention, when attaching a getter inside a cathode ray tube, the getter film can be formed over a wide area, and since the getter is not attached to the electron gun, side effects such as tilting the electron gun can be avoided. Since the getter is fixed in both the circumferential direction and the direction parallel to the axis, the mounting position is stable, so the induction heating conditions for the getter are stable.
A stable method for attaching the getter can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a cathode ray tube, Fig. 2 is a perspective view showing a conventional getter mounting structure, Fig. 3 is a perspective view of getter mounting showing an embodiment of the present invention, and Fig. 4 is a getter mounting structure of the present invention. FIG. 2...Funnel, 5D...Getter, 10...
...Getter support, 21...Getter support plate,
22...Support spring.

Claims (1)

[Claims] 1 In a getter support structure in which a support spring attached to the getter is attached to a getter support fixed to the funnel of a cathode ray tube, the support spring supports the getter by sandwiching the getter support in the circumferential direction, and the support spring A getter support structure for a cathode ray tube, characterized in that the getter support is held between a getter or a getter support plate in a direction parallel to its axis, thereby stabilizing the position of the getter with respect to the inner surface of the funnel.