JPH0614121Y2 - CRT mounting gasket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cathode ray tube mounting gasket for attaching a cathode ray tube to a mounting portion on the front surface of a case.

[Prior Art] FIG. 1 and FIG. 2 are drawings showing an embodiment of the present application, of which known portions will be described in order to better understand the invention of the present application.

In the figure, for example, in order to solve a problem due to heat generation of a cathode ray tube of a projection television, a transparent plate 15 is closely attached to the front surface of an opening 13 of a case 12 to which the cathode ray tube 11 is attached via an O-ring 14, and the transparent plate 15 and the cathode ray tube are There is known a technique in which a cavity 16 is formed between the front surface of the cathode ray tube 11 and the front surface of the cathode ray tube 11 to be filled with a cooling fluid, and the cooling fluid is circulated to cool the heat generated by the cathode ray tube 11.

In the above projection type television, the distance between the front surface of the case opening and the front surface of the cathode ray tube must be accurately determined in terms of projection performance.

On the other hand, in order to seal the cooling liquid, the gasket 1 is interposed between the front surface of the cathode ray tube and the rectangular mounting portion 12a of the case 12, but the gasket 1 is usually formed of a flexible material such as rubber. There is. Therefore, the thickness of the gasket is non-linearly deformed by the amount λ as shown in FIG. 10 due to the tightening force f when the Braun tube 11 is attached to the case 12.
Therefore, it is extremely difficult to take the above-mentioned interval accurately.

For example, Japanese Utility Model Laid-Open No. 57-198440 discloses a vibration-proof support structure, which is tightened with bolts.
The spacing cannot be maintained exactly. See also 62
Although a gasket using a metal piece is disclosed in Japanese Laid-Open Patent Application No. 162458/1992, it is still impossible to accurately set the space between the cathode ray tube and the case.

[Problem to be solved] Therefore, an object of the present invention is to provide a cathode ray tube mounting gasket capable of accurately holding a space between a cathode ray tube and a case.

[Means for Solving the Problems] According to the present invention, in a cathode ray tube mounting gasket for attaching a cathode ray tube to a mounting portion on a front surface of a case, a rectangular strip-shaped first portion and each side portion of the first portion A plurality of second bent and extended toward the side of the mounted body
The first portion is composed of an outer holding portion holding a part of the strip-shaped portion of the metal flat plate, and an inner edge portion of a circular cross section continuous to the holding portion, and the second portion is It comprises a holding extension part that holds the extension part of the metal plate, and a bent part that is bent from the holding extension part and contacts the inner peripheral part of the case.

[Explanation of Operation and Effect] Therefore, in the gasket interposed between the mounting portion of the case and the cathode ray tube, the inner edge portion of the first portion abuts on the mounting portion and the cathode ray tube like an O-ring, and the bent portion has the case. Abut on the inner peripheral part of the. If you install the CRT in this state,
Initially, the inner edge portion is elastically deformed, and when it is deformed by a predetermined amount, the metal flat plate becomes the core metal and is not further deformed. Therefore, after that, even if the tightening force increases, the distance between the cathode ray tube and the case does not change, and accurate positioning can be performed.

Furthermore, since there is a bent portion, even if the CRT moves, the cushion function does not damage the CRT.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, the mounting portion 12 of the case 12
A gasket denoted by reference numeral 1 is interposed between a and the cathode ray tube 11.

In FIG. 3, the gasket is the mounting portion 1 of the case 12.
2a, a rectangular strip-shaped first portion 2 and
It is composed of a plurality of (two in the illustrated example) second portions 5a to 5d bent and extended from each side of the portion 2 toward the side of the cathode ray tube 11.

First, the metal flat plate serving as the core metal will be described. The metal flat plate generally designated by reference numeral 8 is a rectangular strip-shaped portion 9 and extended portions 10a extending from each side of the strip-shaped portion 9 so as to be flush with each other.
10b (10a is longer than 10b).

Referring also to FIG. 4, the first portion 2 includes a strip-shaped portion 9 of the metal flat plate 8, a sandwiching portion 3 in which a substantially elastic center line of the strip-shaped portion 9 is sandwiched from inside by a rubber elastic body, and a sandwiching portion. A rubber elastic body continuous to the portion 3 is formed of an inner edge portion 4 having a circular cross section.

In FIG. 5 to FIG. 8, the second portion 5a is continuous with the first portion 2, and the extension portion 10a of the metal flat plate 8 is embedded and sandwiched by the rubber elastic body in a flat plate shape. And a bent portion 7 formed by bending the holding extension portion 6. The bent portion 7 is formed so as to open slightly outward and open slightly upward toward the vertical line passing through the axis of the cathode ray tube 11.

On the other hand, the second portion 5b is formed symmetrically with the second portion 5a, and the second portions 5c and 5d are respectively formed into the second portion 5a.
Substantially the same as a and 5d.

Therefore, as shown in FIG.
When it is interposed between the attachment part 12a of the second part 2 and the cathode ray tube 11, the inner edge part 4 of the first part 2 has an O-ring shape.
The bent portion 7 contacts the inner peripheral portion 1 of the case 12
Contact 2b.

In this state, the cathode ray tube 11 is provided with a case 1 by means not shown
When tightened to 2, the inner edge 4 is initially deformed by the tightening force f and the thickness of the gasket 1 is elastically deformed linearly as shown in FIG. 9, but when the predetermined deformation amount λ1 is reached, the metal flat plate 8
Becomes a core metal and does not deform even if the tightening force f is further increased.

The predetermined deformation amount λ1 can be selectively determined by the shapes and rubber hardness of the inner edge portion 4, the sandwiching portion 3, and the thickness of the metal flat plate 8.

[Effects of the Invention] As described above, the present invention has the following excellent effects.

(I) Even if the inner edge portion is elastically deformed when it is attached to the cathode ray tube, if it is deformed by a predetermined amount, the metal flat plate becomes a core metal and is not further deformed.

(Ii) Therefore, the CRT can be accurately attached to the case.

(Iii) Even if the cathode ray tube moves due to the bent portion, the cushion action does not damage the cathode ray tube.

[Brief description of drawings]

1 and 2 are perspective views showing a case and a cathode ray tube in which a gasket for carrying out the present invention is inserted, respectively, and a sectional view taken along the line FF of FIG. 1, and FIG. 3 is an embodiment of the present invention. 4 is a plan view of FIG. 4, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, and FIGS. 5 and 7 are enlarged views of portions indicated by circles in FIG. 3, FIG. 6 and FIG. 5 is a sectional view taken along the line DD of FIG. 5 and a sectional view taken along the line EE of FIG. 7, and FIG. 9 shows the relationship between the tightening force and the amount of thickness deformation showing the effect of the present invention. The characteristic diagram shown in FIG. 10 is the conventional gasket No. 9
It is drawing corresponding to a figure. 1 ... Gasket, 2 ... First part, 3 ... Clamping part,
4 ... inner edge portion, 5 ... second portion, 6 ... sandwiching extension portion,
7 ... Bent portion, 8 ... Metal flat plate, 9 ... Strip portion, 10 ...
… Extended part, 11 …… CRT, 12a …… Case mounting part

Claims (1)

[Scope of utility model registration request] 1. A cathode ray tube mounting gasket for mounting a cathode ray tube on a mounting portion on a front surface of a case, wherein a rectangular strip-shaped first portion and each side portion of the first portion are directed to a side portion of the mounted body. And a plurality of second portions that are bent and extended so that the first portion has an outer holding portion that holds a part of the band-shaped portion of the metal flat plate, and an inner edge portion of a circular cross section that is continuous with the holding portion. The second portion includes a sandwiching extension portion that sandwiches the extension portion of the metal plate, and a bent portion that is bent from the sandwiching extension portion and abuts on the inner peripheral portion of the case. A gasket for CRT mounting.