Vacuum electronic tube with getter support structure
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United States of America Patent
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-
Jan 27, 1998
Grant Date -
N/A
app pub date -
Nov 15, 1995
filing date -
Mar 15, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a vacuum tube, particularly a cathode-ray visual-display tube. In order to absorb residual gases after having formed a vacuum in the tube a getter material (barium) is used, which is evaporated onto the internal walls of the tube from a getter support. According to the invention, instead of the getter support being welded to the electron gun it is independent of the gun and is fixed rigidly to the walls of the neck of the tube, in front of the electron gun. The distribution of the getter material in the tube is thus improved, especially for tubes focused by the neck, that is to say tubes for which the internal wall (covered with graphite) of the neck serves as a cylindrical electrode for focusing the electron beam, taken to the anode potential.
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