Flat cathode ray tube with keystone compensation

Details Flat cathode ray tube with keystone compensation Flat cathode ray tube with keystone compensation

H - Electricity

01

J

313/35.313

H01J 29/56 (2006.01) H01J 29/72 (2006.01) H01J 31/12 (2006.01)

Patent

CA 1200834

YO982-053 Abstract of the Disclosure Apparatus for compensating for keystone distortion in a flat cathode ray tube in a relatively straightforward and inexpensive manner, and for providing a tube having relatively high resolution and reduced deflection aberration. A magnetic deflection yoke is utilized to scan the raster on the screen, and corrective deflective forces are provided on the electron beam to compensate for keystone. In a first embodiment, the corrective forces are provided by a magnetic hexapole field, in second and third embodiments by magnetic quadrapole fields in series with horizontal and vertical deflections respectively, and in a fourth embodiment by providing the combination of a hexapole field and orthogonal guadrapole field in series with horizontal and vertical deflections respectively.

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