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Magnetic device for correcting CRT image geometrical defect

A technology of cathode ray tube and magnetic device, applied in the direction of cathode ray tube/electron beam tube, electrode device and related components, discharge tube, etc., can solve the problems such as the registration of residual distortion affecting color purity, etc.

Inactive Publication Date: 2003-10-08
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
  • Magnetic device for correcting CRT image geometrical defect
  • Magnetic device for correcting CRT image geometrical defect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] figure 1 A cross-sectional view of a deflection yoke placed on the neck of a cathode ray tube is depicted.

[0019] The deflection yoke 10 comprises 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.

[0020] A ring 4 of generally frusto-conical shape is placed on the deflection yoke for converging the deflection field of the electron beams from the electron gun 5 in the neck 6 of the cathode ray tube, which is generally cylindrical in shape.

[0021] The deflector 10 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 axis Z...

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PUM

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Abstract

A deflection coil for south / north geometry correction of a cathode ray tube, the cathode ray tube comprises a pair of horizontal deflection coils (3) and a pair of vertical deflection coils (4), and the two pairs of coils are interconnected by an isolator (2) isolation; a ferrite ring (5) at least partially covering a deflection yoke and having an outwardly flared front, said deflection coil comprising, in its front region, at least one pair of magnetic means for locally changing the The magnetic field in the front area and corrects the geometry of the image displayed on the kinescope screen, the magnetic device is arranged in space so that the plane (P) contains the longitudinal axis (Z) of the deflection yoke and the symmetry axis (Y) of the magnetic device, Point M on the plane (P) corresponds to the point of minimum coordinates of the device. The intersection of the ring with (P), at least partially in its front, lies in the area defined by the ray (D1) passing through M perpendicular to Z and the ray (D2) passing through M at an angle of 45° to (D1) outside.

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 Applications(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