Electron tubes using insulation material containing little alkali metal
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United States of America Patent
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Apr 8, 1997
Grant Date -
N/A
app pub date -
Jun 20, 1995
filing date -
Jun 29, 1994
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Abstract
Support electrodes are provided for individually supporting a plurality of dynodes arranged inside of a vessel of an electron tube, such as photomultiplier tube. A black spacer formed from a ceramic material is disposed between the support electrodes. The black spacers are formed with elemental composition having content of MnO suppressed to 3 wt % or less. Current leaks, which are the cause of dark current, and abnormal generations of light during photomultiplication can be reduced, thereby improving the signal-to-noise ratio of the electron tube.
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