Image tube cathode

Details Image tube cathode Image tube cathode

1966-02-16

1978-06-27

Wilbur, Maynard R.

Electric lamp and discharge devices

Geiger-mueller type

H01J 3900

Patent

active

040977617

ABSTRACT:
Photocathode having a transparent conductive undercoating to provide a radial voltage distribution across the cathode surface. The conductive undercoating is in the form of radially spaced rings made of chromium deposited on a glass substrate. Over the substrate and the conducting undercoating is provided a resistive layer comprising chromium having a thickness of about 50 Angstroms. Over the resistive chromium layer is deposited a photoemissive layer of antimony, potassium, sodium and cesium. The radially spaced conductive rings are connected to sources of different voltage to produce a desired voltage distribution across the resistive chromium layer.

REFERENCES:
patent: 2883543 (1959-04-01), Wohl
patent: 3121648 (1964-02-01), Jensen

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