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Color cathode ray tube

Inactive Publication Date: 2003-10-29
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the halo exceeds the allowable range, the focus characteristics are reduced, thereby reducing the quality of the displayed image

Method used

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

Examples

Experimental program
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Effect test

Embodiment Construction

[0038] figure 2 is a sectional view showing a schematic structure of the color cathode ray tube of the present invention. figure 2 Reference numeral 1 in stands for a vacuum vessel of a cathode ray tube. The vacuum container 1 is made of glass and includes: a panel 1A serving as a display portion of a color cathode ray tube; a neck 1B in which an electron gun assembly 2 is housed; and a funnel portion 1C smoothly connected to the panel 1A and the neck 1B.

[0039] The outer diameter of the neck portion 1B of the color cathode ray tube of this embodiment is smaller than 28.1 mm. An electron gun assembly 2 is provided in the neck 1B. The electron gun assembly 2 emits three beams into an in-line arrangement toward the panel 1A (such as figure 2 X direction shown) electron beams 3 (although only one beam is shown) for exciting red (R), green (G) and blue (B) color phosphors, respectively. A phosphor screen 4 is formed on the effective screen portion of the inner wall surfac...

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PUM

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Abstract

A color cathode ray tube having: a vacuum container including a panel with a fluorescent screen on its inner surface, a neck, and a funnel part connected to the neck and the panel; an electron gun including an electrostatic main lens disposed in the neck; A deflection yoke for deflecting the three inline electron beams emitted from the electron gun assembly to the phosphor screen around the neck side; and a dipole magnet around the neck for adjusting the trajectory of the electron beams. The dipole magnet is positioned so that its center is closer to the phosphor screen than the center of the electrostatic main lens of the electron gun assembly. The magnitude of the radial component of the magnetic field distribution of the dipole magnet on a circle of radius s divided by the magnitude of the circumferential component is calculated to be 0.86 to 1.38, preferably 0.955 to 1.275.

Description

technical field [0001] The present invention relates to a color cathode ray tube equipped with an in-line electron gun configured to emit three electron beams horizontally in a line toward a fluorescent screen. Background technique [0002] In a color cathode ray tube, a vacuum container is constituted by a panel configuring a display portion, a neck with an electron gun fitted therein, and a funnel portion smoothly connected to the panel and the neck. [0003] In the electron gun assembly arranged on the neck, three electron guns for emitting three electron beams are arranged in a line at intervals of s, and the three electron beams respectively excite the red (R) of the fluorescent screen formed on the inner surface of the panel. ), green (G) and blue (B) color phosphors. On the fluorescent screen, phosphors of red (R), green (G) and blue (B) colors arranged adjacent to each other constitute one pixel. [0004] Three electron beams emitted from each electron gun excite e...

Claims

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Application Information

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IPC IPC(8): H01J29/70
CPCH01J29/703H01J2229/5682
Inventor 奥健太郎光村秀弘中村智树能势寿司石山国雄
Owner HITACHI LTD