JPH06176703A - Shadow mask used for color picture tube - Google Patents

Abstract

(57) [Abstract] [Purpose] When a spring is attached to a panel pin via a spring piece to fix a shadow mask to the panel, the spring piece may drop and the panel surface may be scratched or workability may deteriorate. Prevent. [Structure] The spring 4a (4/4 pin portion) that is finally assembled to fix the shadow mask to the panel is replaced by one or two spring pieces 7 having a pin hole 41 of a predetermined shape.
A pair of pawls 8a for guiding with a margin in the width direction of mm,
8a and a pawl 8 for supporting the spring piece 7 from below are provided. Then, the spring piece 7 is supported by inserting it between the left and right pawls 8a, 8a of the spring 4a and placing it on the lower pawl 8b, and in such a supported state, the spring 4a and the spring piece 4a are attached to the panel pin. The spring piece 7 is assembled and welded to the spring 4a so as to be fixed thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shadow mask for a color picture tube, and more particularly to a mounting structure thereof.

[0002]

2. Description of the Related Art FIG. 4 is an overall schematic view of a conventional shadow mask of a shadow mask type color cathode ray tube, and FIG. 5 is a front view showing a state in which the shadow mask is mounted on a panel.
The shadow mask, which is designated by 1 in its entirety, comprises a substantially rectangular aperture 2 having innumerable electron beam through holes in its spherical surface, a reinforcing frame 3 into which the aperture 2 is inserted and joined, and a support structure. It is composed of four springs 4. One end of each spring 4 is the frame 3
Is fixed to the outer surface of the panel and the other end is connected to the panel pin 6 of the panel 5 which constitutes the color cathode ray tube envelope. Here, the aperture 2 is press-molded after annealing a shadow mask material plate (not shown) for unifying particles,
Oil and impurities are removed by washing, and blackening is applied to prevent rust and prevent light scattering. Further, the frame 3 is formed in a rectangular tube shape so that the aperture 2 is inserted and joined, and is also cleaned and blackened. The spring 4 is provided on each long side portion and each short side portion of the frame 3. The frame spring structure is fixed and fixed.

As shown in FIG. 6, three of the springs 4 have a pin hole 41 having a predetermined shape to be fitted into the panel pin 6, and these three springs 4 are first attached to the panel pin 6 when assembled. Assemble. Another one (4a) fixed to one long side of the frame 3
7 has an entangled hole 42 in the panel pin fitting portion as shown in FIG. 7. After assembling the other three springs 4, the panel pin 6 is finally assembled, and as shown in FIG. The spring piece 7 having the pin hole 41 having a predetermined shape is assembled, and the spring piece 7 and the spring 4a are welded. FIG. 9 shows a combined structure of the spring 4a and the spring piece 7 to be finally assembled.

Further, Japanese Patent Laid-Open No. 63-6727 discloses an apparatus in which a spring piece (small plate) and a spring are pre-positioned and welded to each other before the shadow mask is finally assembled in a panel. And is disclosed in JP-A-2
Japanese Patent Laid-Open No. 79333 discloses that a disengagement prevention spring is provided to press a support spring in order to prevent the shadow mask from coming off after assembly.

[0005]

In the conventional shadow mask described with reference to FIGS. 4 to 9, after assembling three of the four springs constituting the support structure to the panel pin as described above, a fool hole is formed. Assembling the last one having the above to the panel pin, and then assembling a spring piece having a pin hole of a predetermined shape from above, and welding the spring and the spring piece, at that time, the spring piece falls and scratches the panel surface. However, there is a problem that workability is poor because it is necessary to take care not to drop it. Japanese Unexamined Patent Publication No. 63-6727 discloses an apparatus in which the spring piece (small plate) and the spring are prepositioned and welded to each other as described above. In such a case, a frame to which the spring is previously fixed is used. After positioning on the panel with a jig and welding the spring piece and the spring, remove the frame from the panel once, position the shadow mask with the jig and weld, then re-install the frame on the panel and attach the spring piece. There is no choice but to use a troublesome assembly method such as attaching the spring to the panel pin. Further, Japanese Patent Application Laid-Open No. 2-79333 discloses an engagement disengagement prevention spring for pressing the support spring as described above. The spring is assembled to the panel pin and the spring piece is attached from above. It does not solve the above problems specific to the case.

The present invention has been made to solve the above problems, and prevents the spring piece from falling when the spring mask is fixed to the panel by assembling the spring to the panel pin via the spring piece. The panel surface may be scratched by dropping,
The purpose is to prevent workability from deteriorating.

[0007]

In the shadow mask for a color picture tube according to the present invention, the spring piece is supported by the spring of one side which is assembled at the end of the spring connecting the frame to the panel via the spring piece. A claw or a bent portion is provided.

[0008]

In the shadow mask for a color picture tube according to the present invention, when the spring piece is mounted, the spring piece is prevented from being supported by the pawl or the bent portion provided on the spring and falling to the surface of the panel. Problems such as damage to the panel surface due to the fall of the spring piece and deterioration of workability due to concern about the fall are eliminated.

[0009]

【Example】

Example 1. FIG. 1 shows a spring (4/4) which constitutes a support structure of a color picture tube shadow mask according to an embodiment of the present invention.
It is a top view which shows the combined structure of a pin part) and a spring piece.

This embodiment is based on the shadow mask described with reference to FIGS. The spring 4a (4/4 pin portion) to be assembled at the end of the four springs forming the support structure is a spring having pin holes 41 of a predetermined shape on both left and right sides of the panel pin fitting stagger hole 42. A pair of pawls 8a, 8a for guiding the piece 7 with a margin in the width direction of 1 to 2 mm is provided, and the stupid hole 4 is provided.
A pawl 8b on which the spring piece 7 is placed is provided on the lower side of 2, and the spring piece 7 is configured to be supported by these three pawls 8a, 8a, 8b.

In this embodiment, the spring piece 7 is supported by inserting it between the left and right pawls 8a of the spring 4a and placing it on the lower pawl 8b.
Then, the spring 4a and the spring piece 4a are assembled to the panel pin while being supported in this way, and the spring piece 7 is welded and fixed to the spring 4a.

Since the spring piece 7 is supported by the pawls 8a, 8a, 8b of the spring 4a at the time of mounting as described above, it is possible to prevent the spring piece from being damaged by the fall of the spring piece, and to be careful about the fall. Workability is improved.

Example 2. FIG. 2 shows another embodiment of the present invention. Similar to the first embodiment, a spring piece having pin holes 41 on the side and the lower side of the fool hole 42 of the spring 4a to be finally assembled. Bending portions 9a and 9b having a U-shaped cross section shown in FIG.

In this embodiment, the spring piece 7 is aligned with the side bent portion 9a of the spring 4a and is held by being placed on the lower bent portion 9b. Then, the spring 4a and the spring piece 7 are assembled to the panel pin while being held in this way, and the spring piece 7 is welded and fixed to the spring 4a.

Since the spring piece 7 can be positioned at a predetermined position along one of the bent portions while sliding after hitting the surface of the spring 4a, the possibility that the spring piece will fall during the work is further reduced. Workability can be improved.

[0016]

As described above, according to the present invention, since the spring piece is supported by the pawl of the spring, it is possible to prevent the spring piece from falling and scratching the surface of the panel or the like. Also, the workability is improved because the user can work without worrying about the spring piece falling.

Further, by supporting the spring piece at the bent portion of the spring, the spring piece can be mounted on the bent portion while sliding on the spring surface, so that the spring piece may fall during the work. Can be reduced to improve work efficiency.

[Brief description of drawings]

FIG. 1 is a plan view showing a combined structure of a spring (4/4 pin portion) and a spring piece of a color picture tube shadow mask according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a combined structure of a spring (4/4 pin portion) and a spring piece of a color picture tube shadow mask according to a second embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is an overall schematic view of a conventional shadow mask.

FIG. 5 is a front view showing a state where a conventional shadow mask is attached to a panel.

FIG. 6 is a plan view showing a spring of a conventional shadow mask.

FIG. 7 is a plan view showing a spring (4/4 pin portion) of a conventional shadow mask.

FIG. 8 shows a conventional shadow mask spring piece (4
FIG.

FIG. 9 is a plan view showing a combination structure of a spring (4/4 pin portion) and a spring piece of a conventional shadow mask.

[Explanation of symbols]

 4a Spring 7 Spring piece 8a Pawl 8b Pawl 9a Bent part 9b Bent part

Claims (2)

[Claims] 1. An aperture having an electron beam aperture,
It consists of a substantially rectangular tubular reinforcing frame that reinforces this aperture, and a support structure that connects this frame to the surrounding panel, and the support structure is composed of a plurality of springs that are fixed to each side of the frame. Of these springs, a spring on one side is a shadow mask for a color picture tube that is finally attached to a connecting pin of the panel via a spring piece having a pin hole of a predetermined shape, and the spring piece is A shadow mask for a color picture tube, wherein the spring finally assembled through has a pawl supporting a spring piece. 2. An aperture having an electron beam aperture,
It consists of a substantially rectangular tubular reinforcing frame that reinforces this aperture, and a support structure that connects this frame to the surrounding panel, and the support structure is composed of a plurality of springs that are fixed to each side of the frame. Of these springs, a spring on one side is a shadow mask for a color picture tube that is finally attached to a connecting pin of the panel via a spring piece having a pin hole of a predetermined shape, and the spring piece is A shadow mask for a color picture tube, wherein the spring finally assembled via the above has a bent portion that supports the spring piece on at least two sides of the spring piece attachment portion that are orthogonal to each other.