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Deflection system for colour cathode-ray tube with horizontal coma correction

A technology of horizontal deflection and ray tubes, which is applied in the direction of cathode ray tubes/electron beam tubes, discharge tubes, electrode devices and related components, and can solve problems such as difficult optimization

Inactive Publication Date: 2005-11-23
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This creates a situation where a compromise must be made among the various deflection plate design parameters, which are not easy to optimize

Method used

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  • Deflection system for colour cathode-ray tube with horizontal coma correction
  • Deflection system for colour cathode-ray tube with horizontal coma correction
  • Deflection system for colour cathode-ray tube with horizontal coma correction

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] figure 1 A cross-sectional view of the invention is shown with deflector plate 1 placed in neck 8 of cathode-ray tube 6 . The deflection plate includes a pair of vertical deflection coils 4 and a pair of horizontal deflection coils 3. The two pairs of coils are usually isolated from each other by an isolator 2 made of plastic, and a ring 5 is made of ferromagnetic material for concentrating the coils 3 and 4. magnetic field. These fields deflect the electron beam 12 produced by the electron gun 7 so that the electron beam scans the screen 9 of the tube 6 .

[0019] figure 2 In , the defect of coma aberration that the present invention aims to solve is shown.

[0020] On the screen 9 of the tube, the rectangular image 30 is close to the edge of the screen following an offset between the red / blue image 32 and the green image 31 of the horizontal edge, the green edge image being within the red / blue edge image, resulting in a regular has negative coma aberration errors...

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PUM

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Abstract

Deflector for cathode-ray tube comprising a pair of horizontal deflection coils and a pair of vertical deflection coils, the two pairs being in the shape of a saddle and isolated one from the other by a separator, a frustoconical shaped ferrite ring at least partially covering the deflection coils, the deflector being characterized in that it includes to the rear of the deflection coils, between the horizontal and vertical deflection coils, four field shapers placed symmetrically with respect to the axes of symmetry of the deflector. These shapers are placed so as to increase the amplitude of the second harmonic of the potential of the vertical deflection field without affecting the fundamental of the said potential in order to act on the phenomena of coma appearing on the horizontal edges of the image formed on the tube screen.

Description

technical field [0001] The present invention relates to a deflection device for a color cathode-ray tube. This deflection device is also called a deflection plate. This device includes a pair of saddle-shaped horizontal deflection coils and a pair of vertical deflection coils. More particularly, the deflection plate includes a magnetic field shaper. The field shaper attempts to improve the landing error of the red / blue electron beams relative to the green electron beams on the tube screen along the horizontal edges of the screen. Background technique [0002] A cathode-ray tube to produce a color image usually includes an electron gun emitting three coplanar electron beams, each of which excites a phosphor of a predetermined dominant color (red, green or blue) on the tube screen. [0003] The electron beam scans the tube screen under the influence of a deflection field established by deflection coils of horizontal and vertical deflection plates attached to the neck of the tu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/76H01J29/70
CPCH01J29/707H01J29/701H01J29/76
Inventor 纳赛尔丁·阿齐奥利维耶·马松塞巴斯蒂安·沃拉蒂莱
Owner THOMSON LICENSING SA