JPH04332437A - Color-sorting electrode of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent generation of working points of tensile force wrinkles in a shadow mask sheet as a result of unevenness in the because of unevenness in given to the shadow-mask sheet because of unevnness in fixed points on the contact face between the frame-side of a frame and the shadow-mask sheet. CONSTITUTION:The inner side 5 of the contact face 4 between the frame side 1 of a frame 10 and a shadow-mask sheet 3 is formed higher than the outer side 6 thereof by the method of inclining the contact face 4 toward its outside or the like.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selection electrode for a color cathode ray tube, and more particularly to a color selection electrode for a stretched color cathode ray tube in which tension is constantly applied to a shadow mask plate.

0002

[Prior Art] A stretched type color selection electrode is, for example, shown in FIG.
As shown in the figure, a frame side 1 having an approximately L-shaped cross-sectional shape and curved with two radii of curvature R1 and R2 in mutually orthogonal directions, and an arm portion 2 that faces and connects this frame side 1.
It has a structure in which a shadow mask plate 3 is stretched over a frame 10 consisting of.

The tension applied to the shadow mask plate 3 is applied to the frame 10 by compressing the frame 10 from the outside of the frame side 1 in advance to elastically deform it, and after joining the shadow mask plate 3 in this state. This is provided by the restoring force of the frame 10 due to the removal of compressive forces.

Conventionally, the joint surface 4 between the frame 1 of the frame 10 and the shadow mask plate 3 was processed horizontally.
When the frame 10 is compressed and elastically deformed, as shown in FIG. 5, the joint surface 4 inclines inwardly and the inner side 5 of the joint surface becomes lower than the outer side 6 (hi<h0).

[0005]

[Problems to be Solved by the Invention] In this conventional frame, since the joint surface between the frame side and the shadow mask plate is sloped low inward, the point of action of the tension applied to the shadow mask plate is as shown in FIG. Then, there are individual fixed points 7 on the frame side 1 and the shadow mask plate 3, and if the positions of the fixed points 7 vary,
Since the points of application of the tension also vary, wrinkles may occur on the shadow mask plate 3, making it impossible to obtain a predetermined shape, resulting in a problem that the quality of the image is impaired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color selection electrode for a color cathode ray tube, which does not cause wrinkles on the shadow mask plate and provides images of excellent quality.

[0007]

[Means for Solving the Problems] The present invention includes a frame including opposing frame sides and an arm portion connecting the opposing frame sides, and a shadow mask plate stretched between the opposing frame sides. In the color selection electrode for a color cathode ray tube, the inner side of each of the opposing frame sides of the joint surface between the opposing frame sides and the shadow mask plate is made higher than the outer side.

[0008]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, a shadow mask plate 3 is joined and stretched to a frame 10 consisting of two frame sides 1 and arm parts 2 connecting the two frame sides 1. There is.

Since the joint surface 4 between the frame side 1 of the frame 10 and the shadow mask plate 3 is inclined such that the outside of the frame 10 is lower, the height of the inside side 5 of the joint surface 4 is higher than the outside side 6. In other words, hi>h0.

Therefore, the point of action of the tension applied to the shadow mask plate 3 always coincides with the inner side, no matter where the fixing point 7 between the frame side 1 of the frame 10 and the shadow mask plate 3 is located.

FIG. 2 is a sectional view of a main part of a second embodiment of the invention, and FIG. 3 is a sectional view of a main part of a third embodiment of the invention.

As described above, the method of making the inner side 5 of the joint surface 4 between the frame side 1 of the frame 10 and the shadow mask plate 3 higher than the outer side 6 is not limited to the above-mentioned embodiment, but also the method shown in FIGS. 2 and 3. It may be shaped like this.

[0015]

As explained above, in the color selection electrode of a stretched color CRT, the inner edge of the joint surface between the frame piece and the shadow mask plate is made higher than the outer edge. No matter where the fixing point between the frame piece and the shadow mask plate is, the point of action of the tension applied to the shadow mask plate always coincides with the inner side. Therefore, even if the positions of the fixing points between the frame and the shadow mask plate vary, wrinkles do not occur on the shadow mask plate, a predetermined shape can be obtained, and an image of excellent quality can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the invention.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a third embodiment of the present invention.

FIG. 4 is a perspective view of an example of a color selection electrode of a conventional cathode ray tube.

FIG. 5 is a cross-sectional view illustrating changes in shape when the frame is compressed.

6 is an enlarged perspective view of the joint surface between the frame piece and the shadow mask plate in FIG. 4; FIG.

[Explanation of symbols]

1 Frame piece 2 Arm part 3 Shadow mask board 4 Joint surface 5 Inner side 6 Outer side 7 Fixed point 8 Compressive force 10 Frame

Claims (1)

[Claims] 1. A color selection electrode for a color cathode ray tube, comprising a frame having opposing frame sides and an arm connecting the opposing frame sides, and a shadow mask plate stretched between the opposing frame sides. A color selection electrode for a color cathode ray tube, characterized in that the inner side of each of the opposing frame sides of the joint surface between the opposing frame sides and the shadow mask plate is made higher than the outer side.