JPH10269939A - Manufacture of color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alleviate stress concentration at a corner part, prevent generation of wrinkles or breakage, and enable uniform high tension to be applied to vertical and lateral four directions analogously by overhanging short and long sides of a shadow mask with each other side being released, then welding the shadow mask to a frame with the short and long sides being overhung. SOLUTION: In a work for welding a shadow mask, a full area of the short sides of a shadow mask 1 is sandwiched and overhung among a center jig 3a of a short side and a double-end jig 3b of a short side and a lower jig 3c of a short side. After short side overhanging, a long side of the shadow mask 1 is sandwiched using a long-side jig 4, the double-end jig 3b of the short side is released, and the long side is overhung. By this means, stress concentration at the corner part is alleviated in a state in which uniform, high tension can be given the shadow mask 1. Then, the shadow mask 1 whose four sides are overhung simultaneously is welded to a frame, and a shadow mask structure is fabricated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a color cathode ray tube for use in a television receiver, a display, and the like, in particular, a suspension of a shadow mask structure.

[0002]

2. Description of the Related Art A color cathode ray tube widely used at present is a so-called shadow mask type color cathode ray tube.
In the color cathode ray tube shown in FIG. 4, a shadow mask structure including a shadow mask 14 and a frame 15 is suspended in a vacuum envelope including a panel 11, a funnel 12, and a neck 13. Then, the electron beam 17 emitted from the electron gun 16 passes through the hole of the shadow mask 14 and lands on the fluorescent screen surface 18 formed on the inner surface of the panel, causing the phosphor to emit light.

[0003] However, the electron beam passing through the hole of the shadow mask is about 20% of the total, and the remaining about 80%.
% Strikes the shadow mask. The temperature of the shadow mask rises due to the bombardment of the electron beam, and the shadow mask is deformed by thermal expansion. This causes color misregistration (doming) due to another color hit of the electron beam, which causes a problem that the color reproducibility of the color cathode ray tube is reduced.

[0004] As a countermeasure, a shadow mask to which a certain tension has been applied in advance is welded to a frame.
2. Description of the Related Art There is known a shadow mask structure having a configuration in which even if a shadow mask thermally expands due to an electron beam impact, deformation is absorbed by tension applied to the shadow mask.

For example, in the configuration shown in FIG. 5, the short side is held by using the short side jig 19 without holding the long side of the shadow mask 1 having the perforated area 2 so as to be parallel to the long side. In the direction parallel to the short side, and holding the long side using the long side jig 20 without holding the short side. There is a method in which a side and a short side are simultaneously sandwiched, the shadow mask 1 is simultaneously stretched in a direction parallel to the short side and a direction parallel to the long side, and welded to a frame (Japanese Patent Application Laid-Open No. H08-08380). 162017
No.). In this method, when the holding jig is close to the corner, stress is generated, concentrated, and distorted at the corner when the short side and the long side of the shadow mask are simultaneously stretched. Therefore, the holding jig on each side is shorter than each side of the shadow mask to be held, and stress concentration is reduced by providing an interval between each corner.

[0006]

However, in the above-mentioned conventional method, the corners of the shadow mask are always open and cannot be stretched, and the entire shadow mask cannot be stretched in a similar shape to the original. . In addition, stress relaxation at corners is insufficient, and when high tension is applied to the shadow mask, distortion at the corners becomes wrinkles as it is, and tears may occur from here, and eventually high tension cannot be applied .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. When a shadow mask is sandwiched and stretched with a high tension, stress concentration at corners thereof is reduced, and wrinkles and tears are generated. An object of the present invention is to provide a method of manufacturing a color cathode ray tube with good color reproducibility without doming by applying high tension uniformly in four directions, up, down, left and right, in a similar shape to the original.

[0008]

According to a first aspect of the present invention, there is provided a method for manufacturing a color cathode ray tube, wherein, among the jigs for holding each side of the shadow mask, the jig for holding the short side is longer than the short side. It has a length and is divided into a side center and both ends,
A step of stretching the short side while holding the short side and opening the long side, and a step of stretching the long side while holding the long side and opening both ends of the short side. Then, the shadow mask with the long side and the short side stretched is welded to a frame. With this configuration, after the entire short side including the end of the long side of the shadow mask is held and stretched, the long side can be held in a stretched state without distortion. Then, while holding the short side in a stretched state, both ends of the short side can be opened to stretch the long side. That is, it is possible to apply a uniform high tension to the shadow mask in a state where the stress concentration at the corner portion is reduced.

According to a second aspect of the present invention, in the method for manufacturing a color cathode ray tube, among the jigs for holding each side of the shadow mask, the jig for holding the long side has a length equal to or longer than the long side; And a step of stretching the long side in a state in which the long side is sandwiched and the short side is opened, being divided into a side center portion and both end portions,
Holding the short side, stretching the short side in a state where both ends of the long side are open, and then performing the shadow mask in a state in which the long side and the short side are stretched. Characterized by being welded to the frame. With this configuration, after the entire long side including the end of the short side of the shadow mask is held and stretched, the short side can be held without distortion in a state where the short side is already stretched. Then, while keeping the long side stretched, both ends of the long side can be opened to stretch the short side. That is, it is possible to apply a uniform high tension to the shadow mask in a state where the stress concentration at the corner portion is reduced.

According to a third aspect of the present invention, there is provided a method for manufacturing a color cathode ray tube, wherein the jig for holding each side of the shadow mask comprises:
A step of stretching the long side while holding the long side and opening the center of the short side, and holding the short side, Performing the step of stretching the short side in a state where the portion is opened, and then holding the four sides, opening the common corner portion,
The shadow mask in a state where the center of the long side and the center of the short side are stretched is welded to a frame. With this configuration, the entire long side and the entire short side can be alternately sandwiched and stretched. In other words, it is possible to apply a uniform high tension to the shadow mask and stretch the shadow mask in a shape similar to the original shape in a state where the stress concentration at the corner portion is reduced.

According to a fourth aspect of the present invention, there is provided a color cathode ray tube manufacturing method, wherein the jig for holding each side of the shadow mask comprises:
At the intersection of each side of the shadow mask is divided into a long side and a short side, and the holding jig is further divided into a center and both ends of the side, respectively, and holds the long side, Performing the step of stretching the long side with the short side open, and the step of sandwiching the short side and stretching the short side with the long side open. The shadow mask, in which both sides of the long side and both sides of the short side are opened, and the center of the long side and the center of the short side are stretched, is welded to a frame. And With this configuration, the entire long side and the entire short side can be alternately sandwiched and stretched. In other words, it is possible to apply a uniform high tension to the shadow mask and stretch the shadow mask in a shape similar to the original shape while relaxing the stress concentration at the corners.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view for explaining a shadow mask and a holding jig in a method for manufacturing a color cathode ray tube according to an embodiment of the present invention. A holding jig for holding and stretching a substantially rectangular shadow mask 1 having a perforated area 2 composed of a large number of holes and long sides and short sides includes a short side jig 3 and a long side jig 4. And divided into The short side jig 3 is longer than the short side of the shadow mask 1, and has a structure in which the upper part is divided into a center jig 3a and both end jigs 3b, and can move in a direction parallel to the long side. Has become. Long side jig 4
Is a mechanism that can move in a direction parallel to the short side.

In the actual operation, first, the entire jig of the shadow mask 1 is held and stretched by the jig 3a at the center and the jigs 3b at both ends of the short side and the lower jig 3c. As a result, the shadow mask 1 can be uniformly stretched in the direction parallel to the long side, but the short side is not stretched in the direction parallel to the short side. After the short side is stretched, the long side of the shadow mask 1 is clamped by using the long side jig 4 and the short side end jigs 3b are opened to stretch the long side. As a result, the shadow mask 1 can be uniformly stretched in a direction parallel to the short side. That is, it is possible to apply a uniform and high tension to the shadow mask 1 in a state where the stress concentration at the corners is reduced by the above means. Thereafter, a shadow mask having four sides stretched simultaneously is welded to a frame to produce a shadow mask structure, which is suspended in a vacuum envelope to complete a color cathode ray tube.

Next, FIG. 2 is a view for explaining a shadow mask and a holding jig in a method for manufacturing a color cathode ray tube according to an embodiment of the present invention. The holding jig capable of holding all four sides of the shadow mask 1 without gaps has a structure divided into a short side jig 5, a long side jig 6, and a common corner jig 7, and can operate independently of each other. Mechanism. The short-side jig 5 and the long-side jig 6 are mechanisms that can sandwich the center of each side of the shadow mask 1 and can move in a direction perpendicular to the sandwiched sides. The common corner jig 7 is a mechanism that can be clamped from the long side and the short side, and can move in a direction parallel to the short side and a direction parallel to the long side. With this configuration,
Regardless of whether the long side or the short side is stretched, the entire side can be sandwiched and stretched, and by repeating this alternately, the portions to be sandwiched on both the long side and the short side can be extended uniformly. Can be. Since the center portions of the sides are alternately opened, the portions other than the common corner portion of the shadow mask 1 are curved toward the center due to the influence of the Poisson's ratio. Then, by stretching the center of the curved side using the short side jig 5 and the long side jig 6, it can be stretched to a shape similar to the original. With this configuration, it is possible to reduce the distortion of the shadow mask 1 and apply a uniform high tension to the shadow mask 1. Thereafter, the shadow mask 1 is welded to a frame to produce a shadow mask structure.

FIG. 3 is a view for explaining a shadow mask and a holding jig in a method for manufacturing a color cathode ray tube according to an embodiment of the present invention. The holding jig which can hold all four sides of the shadow mask 1 without gaps includes a short side jig 8 and a long side jig 9 at an intersection of each side of the shadow mask 1.
And divided into These holding jigs are further provided with their upper portions at central jigs 8a, 9a and both end jigs 8b, 9 respectively.
b, the short side of the shadow mask 1 is held by the center jig 8a, both end jigs 8b, and the lower jig 8c, and the long side is held by the center jig 9a and both ends. This is performed using the jig 9b and the lower jig 9c. The short side jig 8 is configured to be movable in a direction parallel to the long side, and the long side jig 9 is configured to be movable in a direction parallel to the short side. With this configuration, it is possible to hold the entire side regardless of whether the long side or the short side is stretched. The actual work alternates between the step of clamping and stretching the entire long side without clamping the short side of the shadow mask 1 and the step of clamping and stretching the entire short side without clamping the long side. After that, the jigs 8 at both ends of the short side are held in a state where both the entire long side and the entire short side of the shadow mask 1 are sandwiched.
b and the long-side end jigs 9b are opened, and the short-side central jig 8 is opened.
a, the lower side jig 8c, the longer side center jig 9a, and the longer side lower jig 9c are used to stretch in a direction parallel to the long side and in a direction parallel to the short side, respectively. The concentration can be reduced, and the shadow mask 1 can be stretched in a shape similar to the original. That is, it is possible to apply a uniform tension to the shadow mask 1 with a simple mechanism, and it is possible to apply a high tension by reducing distortion. Thereafter, the shadow mask is welded to a frame to complete a shadow mask structure.

In the above embodiment, iron is used for the shadow mask, and 13 chrome steel is used for the frame.

[0018]

As described above, according to the present invention, when the shadow mask is sandwiched and stretched with a high tension, stress concentration can be reduced at the corners, and wrinkles and breakage due to distortion can be prevented. it can. In addition, since the shadow mask is uniformly sandwiched and stretched with a high tension in four directions (up, down, left, and right) in a similar shape to the original and welded to the frame, doming does not easily occur during operation of the color cathode ray tube. That is, the present invention can provide a method for manufacturing a color cathode ray tube having good color reproducibility.

[Brief description of the drawings]

FIG. 1 is a view for explaining a shadow mask and a holding jig in a method for manufacturing a color cathode ray tube according to an embodiment of the present invention described in claim 1;

FIG. 2 is a view for explaining a shadow mask and a holding jig in a method for manufacturing a color cathode ray tube according to an embodiment of the present invention described in claim 3;

FIG. 3 is a view for explaining a shadow mask and a holding jig in the method for manufacturing a color cathode ray tube according to an embodiment of the present invention described in claim 4;

FIG. 4 is a schematic sectional view illustrating a conventional color cathode ray tube.

FIG. 5 is a view for explaining a shadow mask and a holding jig in a conventional method for manufacturing a color cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shadow mask 2 Perforated area 3a, 8a Short side jig 3b, 8b Short side both end jigs 3c, 8c Short side lower jig 4, 6 Long side jig 5 Short side jig 7 Common corner jig 9a Long side center jig 9b Long side both end jig 9c Long side lower jig 11 Panel 12 Funnel 13 Neck 14 Shadow mask 15 Frame 16 Electron gun 17 Electron beam 18 Fluorescent screen surface

Claims (4)

[Claims] 1. A method of manufacturing a color cathode ray tube in which a shadow mask structure is suspended, wherein the shadow mask structure includes a plurality of holes arranged in a substantially rectangular area surrounded by two long sides and two short sides. A mask and a frame that stretches and welds the shadow mask, and of the jigs that hold each side of the shadow mask, the holding jig of the short side has a length equal to or longer than the short side, and A step of clamping the short side and stretching the short side in a state where the long side is opened, and clamping the long side and holding both ends of the short side. Performing the step of stretching the long side with the part opened, and thereafter, welding the shadow mask with the long side and the short side stretched to the frame. A method for manufacturing a cathode ray tube. 2. A method of manufacturing a color cathode ray tube in which a shadow mask structure is suspended, wherein the shadow mask structure includes a plurality of holes arranged in a substantially rectangular area surrounded by two long sides and two short sides. A mask, and a frame that stretches and welds the shadow mask, and of the jigs that hold each side of the shadow mask, the holding jig for the long side has a length equal to or longer than the long side, and A step of clamping the long side and stretching the long side in a state where the short side is opened, and a step of clamping the short side and holding both ends of the long side. Performing a step of stretching the short side with the part opened, and thereafter, welding the shadow mask with the long side and the short side stretched to the frame. A method for manufacturing a cathode ray tube. 3. A method of manufacturing a color cathode ray tube in which a shadow mask structure is suspended, wherein the shadow mask structure includes a plurality of holes arranged in a substantially rectangular area surrounded by two long sides and two short sides. A jig for holding each side of the shadow mask is divided into a center part of the side and a common corner part, and a jig for holding the long side. Performing a step of stretching the long side in a state where the center of the short side is opened, and a step of sandwiching the short side and stretching the short side in a state where the center of the long side is opened. Thereafter, the four sides are sandwiched, the common corner portion is opened, and the shadow mask in a state where the central portion of the long side and the central portion of the short side are stretched is welded to the frame. Of manufacturing color cathode ray tube . 4. A method of manufacturing a color cathode ray tube in which a shadow mask structure is suspended, wherein the shadow mask structure includes a plurality of holes arranged in a substantially rectangular area surrounded by two long sides and two short sides. A mask and a frame that stretches and welds the shadow mask, and a jig for holding each side of the shadow mask is divided into a long side and a short side at an intersection of each side of the shadow mask. The holding jig is further divided into a center portion and both end portions of the side, a step of holding the long side, and stretching the long side in a state where the short side is opened; And the step of stretching the short side in a state where the long side is open, and then holding the four sides, and opening both ends of the long side and both ends of the short side, The chassis in a state where the center of the long side and the center of the short side are stretched. A method for manufacturing a color cathode ray tube, comprising welding a dough mask to the frame.