Electron tubes using insulation material containing little alkal

Details Electron tubes using insulation material containing little alkal Electron tubes using insulation material containing little alkal

1995-06-20

1997-04-08

O'Shea, Sandra L.

Electric lamp and discharge devices

Photosensitive

Photomultiplier

313533, H01J 4016

Patent

active

056190999

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.

REFERENCES:
patent: 4333081 (1982-06-01), Butterwick
patent: 4604545 (1986-08-01), McDonie et al.

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