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Color cathode ray tube

A cathode ray tube and color technology, applied in the direction of cathode ray tube/electron beam tube, cathode ray/electron beam tube shell/container, discharge tube, etc., to achieve low-cost effects

Inactive Publication Date: 2004-06-09
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the present invention solves the special problems of a press mask in a large-sized or very large-sized flat type color cathode ray tube using a tone screen, thereby obtaining a shadow mask whose deformation resistance is very strong

Method used

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  • Color cathode ray tube
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  • Color cathode ray tube

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Embodiment Construction

[0040] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the embodiments.

[0041] 1 is a plan view for explaining a press mask of a first embodiment of a color cathode ray tube according to the present invention, and schematically explains a region provided with a central portion and a peripheral portion of the press cover, which is provided Near the inner panel surface of a color cathode ray tube.

[0042] Figure 2A with 2B is a plan view of the main part, schematically explaining the slits formed in the central and peripheral parts shown in FIG. 1 and the bridges connecting the slits in the long length direction thereof.

[0043] Referring to FIG. 1 , the press cover 1 has a substantially rectangular shape with its long sides in the horizontal direction (parallel to the direction of the X-X axis (major axis) of FIG. 1 ) and its short sides in the vertical direction (parallel to the Y-Y of FIG. 1 ). axis ...

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Abstract

The present invention can realize a high-quality flat-face type of color cathode ray tube by combining a tint panel with a pressed mask, the outer surface of the panel of the color cathode ray tube is made nearly flat and the inner surface of the panel is curved in a concave shape, and the long-length direction pitch of slots formed in an aperture region 2 of a pressed mask 1 to be disposed close to the inner surface and the connection-direction width of each of bridges which connect the slots are made different between a central portion (A) and a peripheral portion (B) in the apertured region 2 of the pressed mask 1, whereby the ratio of bridges per unit area is made larger in the central portion (A) than in the peripheral portion (B) or the opening rate of slots per unit area is made larger in the peripheral portion (B) than in the central portion (A). According to this construction, the mechanical strength of the central portion (A) of the pressed mask becomes large, whereby it is possible to restrain the occurrence of undesired deformation of the pressed mask 1 due to the increase of the radius of curvature of the central portion (A) and it is possible to uniformize brightness over the entire screen.

Description

technical field [0001] The present invention relates to a color cathode ray tube, and more particularly, to a color cathode ray tube with a shadow mask corresponding to a large screen plane. Background technique [0002] Color cathode ray tubes, which are widely used as displays for information terminals and television sets, have a tendency for their screen sizes to become larger and larger. In addition, a so-called planar type in which a panel portion constituting a screen is flattened is becoming more and more popular. [0003] A currently popular type of color cathode ray tube has a structure in which a color selection electrode is installed close to the inner surface of a panel on which fluorescent picture elements for three colors are formed, and by means of the color selection electrode Three electron beams emitted from one electron gun are caused to strike respective fluorescent screen elements, respectively. [0004] This color selection electrode adopts a so-calle...

Claims

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Application Information

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IPC IPC(8): H01J29/07H01J29/86
CPCH01J29/861H01J2229/075H01J29/863H01J29/076H01J2229/862H01J29/07
Inventor 井上勇一川村克之
Owner HITACHI LTD
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