JPH04289631A - Damper wire stretching and mounting method of color selection electrode in cathode-ray tube - Google Patents

Abstract

PURPOSE:To reduce the shadow of a damper wire, being projected on an image, to the extent of unobtrusiveness, thereby enhance its image quality. CONSTITUTION:After damper wire 4 have been stretched and mounted on a preset pieces of grid element assembly 3, the damper wires 4 are welded, at random, onto the preset pieces of grid element assembly 3 while the damper wires between arbitrary adjacent two welded parts 8 are cut.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extending damper wires for color selection electrodes of cathode ray tubes.

0002

2. Description of the Related Art As shown in FIG. 5, a conventional color selection electrode includes a frame 7 consisting of a pair of arm portions 2 and a pair of support portions 5, and a linear grid element 3 between the pair of arm portions 2. The slit mask 1 is composed of a predetermined number of slit masks 1 stretched at a constant pitch. Furthermore, damper wires 4 are stretched over the surface of the grid element body 3 of the slit mask 1 in order to prevent the grid element body 3 from resonating due to external vibrations, causing color shift and deteriorating image quality. There is. This damper wire 4
For example, a thin wire made of tungsten or the like is used, and is attached to the spring material 6 fixed to the support part 5 of the slit mask 1 by welding via a thin stainless steel plate 9.

0003

SUMMARY OF THE INVENTION In conventional slit mask type cathode ray tubes, image quality has been degraded due to damper wires. This is because when an image is reproduced using an electron beam, a damper line is projected onto the phosphor screen, causing the phosphor in that area to not emit light, resulting in the problem that the shadow is noticeable when viewing the image. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for extending damper wires for color selection electrodes of a cathode ray tube, which allows an image to be obtained without deterioration in image quality due to projection of the damper wires.

[0005]

[Means for Solving the Problems] In the present invention, a predetermined number of grid elements are stretched between a pair of arm portions of a frame, and damper wires are moved to the predetermined position by spring members fixed to a pair of support portions of the frame. In the damper wire tensioning method for a color selection electrode of a cathode ray tube, which is stretched over a predetermined number of grid elements, after the damper wire is stretched over the predetermined number of grid elements,
The method is characterized in that a predetermined number of the damper wires are randomly welded to the grid element body, and the damper wires between any two adjacent welded portions are cut and removed.

[0006]

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

FIG. 1 is a perspective view illustrating an embodiment of the present invention, FIG. 2 is a partially enlarged perspective view of the slit mask after welding the damper wire in FIG. 1, and FIG. 3 is a perspective view of the color selection mask after cutting the damper wire. 4 are partially enlarged perspective views of the slit mask shown in FIG. 3.

As shown in FIG. 1, first, the slit mask 1 is fixed to a pair of arms 2 of the frame 7, and a spring material 6 is fixed between the pair of supporting parts so as to be orthogonal to the grid element 3. A plurality of damper wires 4 are stretched around a spring member 6 via a thin plate 9.

Next, as shown in FIG. 2, the damper wires 4 are randomly welded to the grid element body 3 at welding portions 8.

Next, as shown in FIGS. 3 and 4, the damper wire 4 is cut and removed in the vicinity of the welded portion 8, leaving the damper wire 4 between any two welded portions 8. At this time, the length of the damper wires 4 remaining in the slit mask 1 is set to 30 mm or less, and each grid element body 3 of the slit mask 1 as a whole is brought into contact with or welded to two or more damper wires 4.

After randomly welding the damper wires 4 to the grid element body 3 in this way, the damper wires 4 between any two adjacent welded parts 8 are cut and removed, thereby preventing the grid element body 3 from being affected by external vibrations. In addition to suppressing resonance, the shadow of the damper line on the image becomes less noticeable.

0012

[Effects of the Invention] As explained above, in the present invention, after welding a damper wire to a slit mask to suppress color shift caused by vibration of the slit mask, the damper wire is randomly cut and removed between any two welded parts, so that the damper wire can be removed on the image. This has the effect of making the shadow of the projected damper line less noticeable and improving image quality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating an embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of the slit mask after welding the damper wire in FIG. 1;

FIG. 3 is a perspective view of the color selection mask after cutting the damper wire.

FIG. 4 is a partially enlarged perspective view of the slit mask of FIG. 3;

FIG. 5 is a perspective view of an example of a conventional color selection mask.

[Explanation of symbols]

1. Slit mask 2 Arm part 3 Grid element 4 Damper wire 5 Support part 6 Spring material 7 Frame 8 Welded part 9 Thin plate 10 Slit hole

Claims (1)

[Claims] 1. A predetermined number of grid elements are stretched between a pair of arm portions of a frame, and a damper wire is stretched over the predetermined number of grid elements by a spring member fixed to a pair of supporting parts of the frame. In the damper wire tensioning method for a color selection electrode of a cathode ray tube, the damper wires are stretched over the predetermined number of grid elements, and then the damper wires are randomly welded to the predetermined number of grid elements. A method for extending a damper wire for a color selection electrode of a cathode ray tube, characterized in that the damper wire between any two adjacent welds is cut and removed.