Color picture tube having an inline electron gun with an astigmatic prefocusing lens
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United States of America Patent
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-
Nov 19, 1991
Grant Date -
N/A
app pub date -
Feb 22, 1990
filing date -
Feb 22, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A color picture tube includes an inline electron gun for generating and directing three inline electron beams along coplanar beam paths toward a screen. The gun includes a plurality of electrodes which form a beam-forming region, a prefocusing lens, and a main focusing lens for the electron beams. The prefocusing lens includes four active surfaces. At least one of the active surfaces has asymmetric prefocusing recesses formed therein.
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