Method and apparatus for providing a dynamic rotational alignment of a cathode ray tube raster
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United States of America Patent
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Aug 28, 2007
Grant Date -
Jul 15, 2004
app pub date -
Dec 4, 2003
filing date -
Aug 14, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus used to step and correct the position of raster lines in a sinusoidal or zig-zag deflection system. By combining the magnetic flux generated with a rotation 'twister' coil and a vertical deflection coil, scan lines can be uniformly spaced and separated nearly to their ends. Accordingly, the magnetic flux generated with the twister coil is adjusted going in the left to right direction then reversed in polarity and readjusted while returning from right to left. It is this controlled twister flux that combines with the linear vertical deflection flux to straighten and then step each scan line to produce an aligned raster.
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