X-ray tube having a getter shield and method
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United States of America Patent
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Apr 16, 1996
Grant Date -
N/A
app pub date -
Feb 9, 1995
filing date -
Feb 9, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An x-ray tube (14) has an evacuated envelope (30) in which an anode (32), a cathode (34), and a getter shield (60) are disposed. The shield includes a sleeve (62) and a cap (64). The cap defines an annular groove (70). A getter material (72) is deposited in the groove and sintered to define a porous volume. The getter material is activated during normal exhaustion of the x-ray tube during manufacture. During operation of the tube to generate x-rays, the waste heat is absorbed by the cap passively raising the getter material to its pumping temperature.
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