JP2001176420A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems such as deformations of a frame and a mask in the process, after the mask is spread. SOLUTION: In a color cathode-ray tube consisting of the mask, a pair of a first frame that supports the mask, and a pair of a second frame that supports the first frame, cross-sectional shape of the first frame is constituted, so that it is triangular, with a collar and distance between welded portion of the first frame to determine the collar length and R face becomes constant along lengthwise direction of the first frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color cathode ray tube, and more particularly to a shape of a frame for supporting a shadow mask constituting the color cathode ray tube.

[0002]

2. Description of the Related Art Generally, a color selection mechanism of a color cathode ray tube includes a shadow mask (also simply referred to as a mask), a first frame supporting the shadow mask, and a second frame supporting the first frame. It is composed of

FIG. 3 is a perspective view showing the structure of a conventional color cathode ray tube. In FIG. 3, reference numeral 101 denotes a first frame, 102 denotes a second frame, and 103 denotes a shadow mask. FIG. 4 is a perspective view showing the structure of a first frame of a conventional color cathode ray tube. In FIG. 4, 101 is the first frame, 104 is the R surface, 105 is the welded portion, 10
6 is a side surface, 107 is a bottom surface, and 108 is an inclined surface.

Hereinafter, a conventional color cathode ray tube, particularly, a first frame shape will be described with reference to FIGS. 3 and 4. FIG. As shown in FIG. 4, the first frame 101 is formed by pressing a plate-like metal plate, bending the cross-section into a triangular prism shape with a flange, and then forming the inclined surface 1.
07 and the side surface 106 are welded. The distance between the R surface 104 and the welded portion 105, which determines the length of the flange portion, is longer at the central portion along the longitudinal direction of the first frame. That is, the welded portion is parallel to the bottom surface 106 and linear.

Next, the first frame 101 and the second
Are welded and integrated with each other. next,
After the integrated first and second frames are blackened, a separately blackened shadow mask 103 is stretched along the R surface 104 of the first frame 101. Thus, a color cathode ray tube as shown in FIG. 3 can be formed, and a large and flat color cathode ray tube can be formed.

[0006]

However, in the frame structure of the conventional color cathode ray tube, since the welded portion of the first frame is straight, the cross-sectional shape thereof is small.
The structure was such that the length of the brim portion was longer toward the center of the first frame. Therefore, the rigidity of the central portion of the frame is low, and there has been a problem that the frame and the mask are thermally deformed in a process after stretching the mask, particularly in a high-temperature process when fixing the mask to a glass panel. For this reason, there is a problem that color shift of the color cathode ray tube occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is intended to improve the rigidity of a frame, particularly the rigidity of a frame supporting a mask, and to provide a color cathode ray tube which is free from frame deformation and mask deformation in a manufacturing process. An object is to provide a cathode ray tube.

[0008]

In order to achieve the above object, a color cathode ray tube according to the present invention comprises a shadow mask, a pair of first frames supporting the shadow mask,
In a color cathode ray tube including a pair of second frames supporting the first frame, a cross-sectional shape of the first frame is a triangular shape with a brim portion, and a length of the brim portion is the first shape. Is constant along the longitudinal direction of the frame.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIGS.

(Embodiment 1) FIG. 1 is a perspective view schematically showing a configuration of a first frame of a color cathode ray tube according to a first embodiment of the present invention. In FIG. 1, 10
2 is the first frame, 104 is the R surface, 105 is the weld,
106 is a side surface, 107 is a bottom surface, and 108 is an inclined surface.

In this embodiment, an Fe-Ni alloy (invar alloy) is used as the first frame. The flat plate-shaped alloy is processed into a predetermined shape by press working, and then subjected to bending, whereby the cross-sectional shape is processed into a triangular prism shape with a brim portion, similarly to the first frame of the related art. Next, the first frame 101 is manufactured by welding the side surface 106 and the inclined surface 107.

In this embodiment, the welded portion 105 and the R surface 1
The distance from the first frame is made substantially constant along the longitudinal direction of the first frame. This makes it possible to relatively increase the rigidity of the central portion of the frame.

The first frame is made of, for example, Fe
-It is fixed to the second frame made of the Ni alloy by welding or the like to form a frame. Thereafter, the frame is blackened by heat treatment in an oxidizing atmosphere. Finally, a separately blackened shadow mask is stretched along the blackened frame, specifically, the R surface of the first frame, and is fixed to the frame by seam welding or the like. At this time, the first frame of the frame applies a load to the side surface. This keeps the mask tension high when the frame is unloaded. Through the above steps, a color cathode ray tube is manufactured.

Therefore, in the conventional first frame, it is difficult to sufficiently maintain the tension of the mask because the rigidity of the central portion of the frame is low. However, as in the present embodiment, by increasing the rigidity of the center portion of the frame relatively, a color cathode ray tube having a uniform mask tension distribution and maintaining a large tension can be obtained.

In this embodiment, an invar alloy is used as the first frame. However, the material is not particularly limited, and other steel materials such as stainless steel and aluminum killed steel may be used.

There is no particular limitation on the material of the second frame or the mask.

FIG. 2 is a perspective view schematically showing the configuration of a first frame of a color cathode ray tube in another example according to the first embodiment of the present invention. In FIG.
Is the first frame, 104 is the R surface, 105 is the welded portion, 1
06 is a side surface, 107 is a bottom surface, and 108 is an inclined surface.

In FIG. 2, as in the case of FIG. 1, the first frame is formed by pressing, bending, and welding a steel plate. In the present embodiment, the steel plate is pre-pressed so that the distance between welded portion 105 and R surface 104 becomes narrower at the center of the frame. Therefore, it is possible to further increase the rigidity of the center portion of the frame as compared with the frame of FIG.

As described above, in the color cathode ray tube comprising the mask, the pair of first frames supporting the mask, and the pair of second frames supporting the first frame, The cross-sectional shape of the frame is a triangular shape with a brim, and the distance between the welded portion of the first frame and the R surface that determines the length of the brim is along the longitudinal direction of the first frame. A color cathode-ray tube frame or mask, a pair of first frames supporting the mask, and a pair of second frames supporting the first frame. In the cathode ray tube, the cross-sectional shape of the first frame is a triangular shape with a flange, and determines the length of the flange. The distance between the welded portion of the first frame and the R surface is:
By using the frame for a color cathode ray tube characterized in that it is small at the center of the frame, a decrease in the tension of the mask before and after the mask is stretched over the frame can be suppressed.

Further, by adjusting the distance between the welded portion of the first frame and the R-plane according to the aspect ratio and the diagonal length of the color cathode ray tube, a uniform and large tension is applied over the entire mask. Can be given.

Further, even when a high temperature process such as a glass sealing step of a color cathode ray tube is performed, a mask tension distribution in a longitudinal direction of the first frame can be secured, and a high performance color cathode ray without color shift or the like can be obtained. You can get a tube.

[0022]

As is apparent from the above description of the embodiment, the frame for a color cathode ray tube according to the present invention comprises a mask, a pair of first frames for supporting the mask, and a frame for supporting the first frame. In a color cathode ray tube comprising a pair of second frames to be welded, the first frame has a triangular cross-sectional shape with a brim portion, and determines the length of the brim portion. The distance between the portion and the R surface is constant along the longitudinal direction of the first frame, or a mask, a pair of first frames supporting the mask, and supporting the first frame In a color cathode ray tube comprising a pair of second frames,
The cross-sectional shape of the first frame is a triangular shape with a brim, and the distance between the welded portion of the first frame and the R surface that determines the length of the brim decreases at the center of the frame. It is characterized by having.

[0023] This makes it possible to suppress a decrease in the tension of the mask before and after the mask is stretched over the frame.
By adjusting the distance between the welded portion of the frame and the R surface, a uniform and large tension can be applied to the entire mask. Furthermore, even after a high-temperature process such as a glass sealing step of a color cathode ray tube, a mask tension distribution in the longitudinal direction of the first frame can be secured, and a high performance color cathode ray tube without color shift or the like can be obtained. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a first frame according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing another structure of the first frame according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing the structure of a color cathode ray tube.

FIG. 4 is a perspective view showing a first frame structure in a conventional cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 1st frame 102 2nd frame 103 Mask 104 R surface 105 Weld part 106 Side surface 107 Bottom surface 108 Inclined surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Togawa 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C031 EE08

Claims (2)

[Claims] A color cathode ray tube comprising a shadow mask, a pair of first frames supporting the shadow mask, and a pair of second frames supporting the first frame; A color cathode ray tube, wherein a cross-sectional shape of the frame is a triangular shape with a flange portion, and a length of the flange portion is constant along a longitudinal direction of the first frame. 2. A color cathode ray tube comprising: a shadow mask; a pair of first frames supporting the shadow mask; and a pair of second frames supporting the first frame, wherein the first color cathode ray tube comprises: A color cathode ray tube, wherein a cross-sectional shape of a frame is a triangular shape with a flange portion, and a length of the flange portion is reduced in a center portion of the first frame.