Photocathode with plurality of concentric conducting rings

Details Photocathode with plurality of concentric conducting rings Photocathode with plurality of concentric conducting rings

1974-07-18

1976-02-03

Segal, Robert

Electric lamp and discharge devices

Secondary emission prevention

Nonemissive material

250508, H01J 3918, H01J 3904

Patent

active

039366871

ABSTRACT:
A flat large-area photocathode intended for use in an intensifier tube is constructed so that a pre-determined potential gradient can be maintained across its surface in operation in order to simplify the electron-optical system of the intensifier. This is done by providing photoemissive material on an electrically resistive layer or sheet on a major surface of which is provided a series of spaced rings of electrically conductive material one inside the other. The spacings and widths of the rings are chosen so that, when a potential difference is applied between the center and the edge of the sheet or layer, the desired potential gradient is set up across the surface of the photocathode. The intensifier tube may be an x-ray image intensifier.

REFERENCES:
patent: 2698912 (1955-01-01), Teves et al.
patent: 2760077 (1956-08-01), Longini
patent: 3634713 (1972-01-01), Foote

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