Compensating device for raster distortion of CRT

Details Compensating device for raster distortion of CRT Compensating device for raster distortion of CRT

1997-03-18

1999-07-13

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

G09G 104

Patent

active

059231319

ABSTRACT:
A compensating device for raster distortion is provided, which can compensate a raster distortion, preferably including an inner pincushion distortion, by a simple and inexpensive configuration. The compensating device comprises an electromagnet and a pair of permanent magnets. The electromagnet is disposed outside of a deflection yoke and at a center portion of a side of a beam-deflection area, and generates magnetic poles in the direction along the side. The pair of permanent magnets are disposed beyond the ends of the side, and generate magnetic poles aligned with the magnetic poles of the electromagnet.

REFERENCES:
patent: 4992697 (1991-02-01), Penninga et al.
"Testing Methods for Cathode-Ray Tubes with Deflection Yoke", Technical Committee on Electronic Display Devices, pp. 22-25, 31-32 (with partial translation).
Communicarion from European Patent Office and attached Search Report.

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