Color picture tube having an inline electron gun with three astigmatic lenses
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United States of America Patent
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-
Jul 4, 1995
Grant Date -
N/A
app pub date -
Sep 24, 1993
filing date -
May 10, 1993
priority date (Note) -
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Abstract
An improved color picture tube includes a screen and an inline gun for generating and directing three inline electron beams along separate paths toward the screen. The electron gun includes electrodes that provide a beam-forming region, a prefocus region and a main focus region. The beam-forming region of the gun includes a cathode, a G1 electrode, a G2 electrode and a first portion of a G3 electrode. The prefocus region includes a second portion of the G3 electrode, a G4 electrode and a first portion of a G5 electrode. The main focus region includes a second portion of the G5 electrode and a G6 electrode. The improvement resides in the beam-forming region, the prefocus region and the main focus region each being astigmatic.
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