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Cathode ray tube equipment

A technology for cathode ray tubes and grids, applied in cathode ray tubes/electron beam tubes, electrode devices and related components, discharge tubes, etc., can solve problems such as poor dimensional accuracy, increased cost, and differences in focusing performance

Inactive Publication Date: 2002-08-28
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, when forming the partition-like protruding part, in consideration of productivity, it is necessary to use shearing and bending by pressing.
These processes have poorer dimensional accuracy than hole drilling.
Therefore, it is difficult to improve the dimensional accuracy when forming the spacer-shaped protruding part, resulting in a difference in the strength of the quadrupole lens or an undesired electron beam deflection effect, etc., which cause a difference in focusing performance and deterioration
In addition, due to the structure protruding in the electron beam advancing direction, there is also a disadvantage that the length of the grid in the electron beam advancing direction cannot be shortened, and the degree of freedom in the design of the electron gun components is limited.
An additional disadvantage is the increased cost due to the increased part count

Method used

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Examples

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Embodiment Construction

[0039] A cathode ray tube device according to an embodiment of the present invention will be described below with reference to the drawings.

[0040] like Figure 4 As shown, the cathode ray tube device of this embodiment, that is, the color cathode ray tube device, is a so-called in-line color cathode ray tube device having an in-line electron gun unit that emits three electron beams arranged in-line in the horizontal direction H. . The in-line color cathode ray tube has a tube envelope 110 composed of a glass panel 101, a tube neck 105, and a funnel 102 connected to the glass panel 101 and the tube neck 105.

[0041] The glass screen 101 is formed in an approximately rectangular shape, and has a fluorescent screen 103 ( target). The shadow mask 104 is installed at a position facing the phosphor screen 103 with a predetermined interval therebetween. The shadow mask 104 has a large number of small holes through which electron beams pass.

[0042] The neck 105 has a substa...

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PUM

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Abstract

The electron gun structure of the cathode ray tube device of the present invention includes a quadrupole lens formed as the deflection amount of the electron beam increases. A circular electron beam passes through the hole. Each electron beam passage hole has a narrow neck portion with the smallest horizontal or vertical aperture in the electron beam passage region.

Description

technical field [0001] The present invention relates to a cathode ray tube device, in particular to a color cathode ray tube device which reduces beam spot ellipse distortion at the periphery of a fluorescent screen and displays high-quality images. Background technique [0002] A general color cathode ray tube device has an in-line electron gun unit that emits three electron beams arranged in-line in the horizontal direction, and a deflection yoke that generates a non-uniform deflection magnetic field that deflects the three electron beams in the horizontal and vertical directions. . QPF (Quadru-Potential Focus, four-position focus) type double-focus electron gun component as an electron gun component emitting three electron beams, such as Figure 8 As shown, there are three cathodes K arranged in line and six grids G1 to G6 arranged in sequence toward the fluorescent screen. Each of the grids G1 to G6 has three electron beam passing holes corresponding to the three cathod...

Claims

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Application Information

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IPC IPC(8): H01J29/48H01J29/50
CPCH01J29/503H01J2229/582H01J29/48
Inventor 武川勉上野博文
Owner KK TOSHIBA