High yield wide channel annular ring shaped getter device
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United States of America Patent
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Jun 2, 1992
Grant Date -
N/A
app pub date -
Oct 1, 1990
filing date -
Oct 19, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An evaporable getter device, for mounting in an electron tube, comprises a holder whose bottom wall is provided with means for preventing detachment of getter metal vapor releasing material which has been pressed into the holder and which has a multiplicity of means which retard the transmission of heat in a circumferential direction through the getter metal vapor releasing material. When the getter device is heated by currents induced from a radio-frequency field generated by a coil positioned outside the electron tube large amounts of getter metal are released in a short time without detachment of material from the holder. The heat retarding means are preferably four equally spaced radial grooved formed in the upper surface of the getter metal vapor releasing material.
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