Method of making color picture tubes having a mix of electron guns
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United States of America Patent
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Aug 31, 1999
Grant Date -
N/A
app pub date -
Aug 7, 1997
filing date -
Sep 18, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides an improvement in a method of making a plurality of color picture tubes of approximately the same size and including a mix of at least two different types of electron guns therein. The electron guns include each a plurality of electrodes, with each electrode having openings for the passage of three electron beams. The improvement comprises selecting materials for each electrode of the at least two different types of electron guns that will produce a minimum difference in the focus voltage sensitivities between the two different types of electron guns.
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