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Magnetic device for correcting CRT image geometrical defect and CRT

一种阴极射线管、偏转线圈的技术，应用在阴极射线管/电子束管、电极装置及有关部件、放电管等方向，能够解决剩余畸变影响色彩纯度的配准等问题

Inactive Publication Date: 2008-05-14
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these solutions have to generate stronger correction fields and cause residual distortions such as image symmetry defects or registration defects that affect color purity on the screen

Method used

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  • Magnetic device for correcting CRT image geometrical defect and CRT
  • Magnetic device for correcting CRT image geometrical defect and CRT
  • Magnetic device for correcting CRT image geometrical defect and CRT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] figure 1 A cross-sectional view of a deflection yoke placed on the neck of a cathode ray tube is depicted.

[0020] The deflection yokes comprise a pair of horizontal deflection coils 1 and a pair of vertical deflection coils 2 separated by a separator 3, usually made of electrically insulating plastic.

[0021] A ferrite ring 10 of substantially frusto-conical shape is placed on the deflection yoke for converging the deflection field of the electron beam from the electron gun 5 in the neck 6 of the cathode ray tube which is substantially Cylindrical shape.

[0022] The deflector is placed above the flared portion 7 of the picture tube. The isolator 3 generally comprises a front ring 9 supporting in particular correction magnets 8 mainly designed to correct geometric defects that cannot be corrected by the astigmatism of the deflection field. The magnet 8 generally comprises, as a plane of symmetry, a plane P containing a vertical deflection axis Y and a longitudinal...

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PUM

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Abstract

Deflection yoke for cathode-ray tubes with a north / south geometry correction comprising a pair of horizontal deflection coils (3)and a pair of vertical deflection coils (4), the two pairs being isolated one from the other by a separator (2), a ferrite ring (5) at least partly covering the deflection coils and having a flared front part, the deflection yoke comprising in its front region at least one pair of magnetic means to modify locally the magnetic field in the said front region and to correct the geometry of the image created on the screen of the tube, the magnetic means being placed in the space in such a way that, for a plane (P) containing the longitudinal axis (Z) of the deflection yoke and the axis of symmetry (Y) of a magnetic means, and for the point M of the plain (P) corresponding to the point of minimum coordinates of the said means, the intersection of the ring with (P) is at least partly in its front part, located outside the region delimited by the half line (D1) passing through M and perpendicular to Z, and the half line (D2)passing through M and making an angle of 45 DEG with (D1).

Description

technical field [0001] The present invention relates to a magnetic device for correcting geometrical defects in images displayed on the screen of a cathode ray tube. More particularly, the invention is suitable for kinescopes having panels with large radii of curvature. Background technique [0002] A cathode ray tube used to produce color images typically includes an electron gun that emits three electron beams, each used to activate a luminescent material of a particular primary color (red, green or blue) on the picture tube screen. [0003] The electron beam scans the screen of the picture tube under the action of the deflection field generated by the deflection device, which is also called a deflection coil, fixed on the neck of the picture tube, and includes horizontal and vertical coils for deflecting the electron beam. A generally frustoconical ring of ferrite material, usually surrounding the deflection yoke, for concentrating the deflection field in a suitable area....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/76H01J29/70
CPCH01J29/701H01J29/76
Inventor 纳塞尔丁·阿齐塞利娜·科苏塞巴斯蒂安·沃拉蒂耶
Owner THOMSON LICENSING SA