Deflection system with a controlled beam spot
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United States of America Patent
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Feb 6, 1996
Issued Date -
N/A
app pub date -
May 17, 1993
filing date -
Jul 19, 1990
priority date (Note) -
Expired
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Abstract
A deflection apparatus produces a field gradient that reduces a tendency of a major axis of a beam spot to become elongated at each corner, at each end of a horizontal axis and at each end of a vertical axis of a display screen relative to the beam spot at the center of the display screen. A beam spot stigmator causes the beam spot to be substantially anastigmatic at each of the corners, the end of the horizontal axis and the end of the vertical axis of the display screen.
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