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Color cathode-ray tube

A cathode ray tube, color technology, applied in the direction of cathode ray tube/electron beam tube, discharge tube, electrical components, etc., can solve the problem of insufficient chromatic aberration suppression, and achieve the effect of improving chromatic aberration

Inactive Publication Date: 2007-04-18
MATSUSHITA TOSHIBA PICTURE DIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the current cost-competitive environment, it is difficult to use method A1 in order to reduce costs, but there is a limit to using only methods A2 and B1 to suppress chromatic aberration
As mentioned above, the current situation is that the chromatic aberration suppression effect cannot be obtained sufficiently by the conventional method

Method used

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  • Color cathode-ray tube
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  • Color cathode-ray tube

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0070] 1 is a perspective view of a state of a shadow mask 10 of a color cathode ray tube according to a first embodiment of the present invention before being welded to a frame 8 as seen from the panel 1 side. The substantially rectangular shadow mask 10 is formed of a thin metal plate and includes: a substantially rectangular perforated region 11 provided with a plurality of stripe-shaped or dot-shaped electron beam passing holes; a non-perforated region 12 disposed on the perforated region 11 and a skirt 13 bent toward the electron gun side at approximately a right angle with respect to the non-porous region 12 . Similar to the conventional shadow mask shown in FIG. 13 , in the perforated area 11, there are a plurality of connecting strips whose longitudinal direction is the y-axis direction, and a plurality of bridges connecting adjacent connecting strips in the x-axis direction. A plurality of electron beam passage holes are formed between adjacent connection strips in th...

no. 2 approach

[0133] 7 is a perspective view of the shadow mask 10 of the color cathode ray tube according to the second embodiment of the present invention viewed from the side opposite to the panel 1 . FIG. 8 is an enlarged cross-sectional view of the vicinity of the non-porous region 12 along a plane parallel to the z-axis and perpendicular to the plane of the skirt 13 . Similar to the first embodiment, in the shadow mask 10 of the second embodiment, the non-porous region 12 has a curved surface that smoothly connects the perforated region 11 and the skirt 13, and the region near the perforated region 11 has a The curved surface of the perforated region 11 is an extended curved surface, so that the region on the side of the skirt 13 has a curved surface independent of the perforated region 11 . Here, "independent" means that a function representing the shape of a curved surface of a certain region is different from a function representing the shape of a curved surface of a region adjacen...

Embodiment 2

[0141] Example 2 is roughly equivalent.

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PUM

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Abstract

A shadow mask includes a perforated region in which a plurality of electron beam passage apertures are formed, a non-perforated region on the periphery of the perforated region, and a skirt portion bent to an electron gun side with respect to the non-perforated region. The curved surfaces on an x-axis and a y-axis of the perforated region are convex to a panel side. The perforated region includes a curved surface that is convex to the panel side and a curved surface that is convex to the electron gun side on a periphery of the perforated region. Furthermore, the perforated region has a curved surface that is convex to the panel side and a curved surface that is convex to the electron gun side in a region surrounded by the periphery, the x-axis, and the y-axis. Because of this, the color displacement caused by doming can be reduced while a shadow mask is used which is made of an inexpensive iron material, and in which the increase in the difference in elevation in the z-axis direction between a center portion and a diagonal portion of the perforated region is suppressed.

Description

technical field [0001] The present invention relates to a color cathode ray tube equipped with a shadow mask. Background technique [0002] Fig. 12 is a cross-sectional view showing a schematic structure of a general color cathode ray tube. The color cathode ray tube includes a package 3 formed by bonding a panel 1 and a funnel 2 . On the inner surface of the panel 1, a fluorescent screen 9 is formed by applying red, green, and blue phosphors in stripes or dots. The shadow mask 10 is held by the frame 8 attached to the inner wall surface of the panel 1 so as to face the fluorescent screen 9 . Inside the neck portion 2a of the funnel 2, there is built an electron gun 4 emitting three electron beams 5 corresponding to red, green, and blue colors. A magnetic shield 7 that shields the electron beam 5 from an external magnetic field is mounted on the frame 8 . A color cathode ray tube device is constituted by mounting a deflection yoke 6 on the outer peripheral surface of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J29/07
CPCH01J2229/0794H01J29/07
Inventor 樱井浩有田进一
Owner MATSUSHITA TOSHIBA PICTURE DIS