Electric lamp and discharge devices – Photosensitive – Photocathode
Patent
1997-12-09
1999-08-03
O'Shea, Sandra
Electric lamp and discharge devices
Photosensitive
Photocathode
313530, 313541, 313539, 313544, H01J 4006
Patent
active
059329661
ABSTRACT:
An electron source includes a negative electron affinity photocathode on a light-transmissive substrate and a light beam generator for directing a light beam through the substrate at the photocathode for exciting electrons into the conduction band. The photocathode has at least one active area for emission of electrons with dimensions of less than about two micrometers. The electron source further includes electron optics for forming the electrons into an electron beam and a vacuum enclosure for maintaining the photocathode at high vacuum. The photocathode is patterned to define emission areas. A patterned mask may be located on the emission surface of the active layer, may be buried within the active layer or may be located between the active layer and the substrate.
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Baum Aaron W.
Costello Kenneth A.
McCord Mark A.
Pease R. Fabian
Schneider James E.
Board of Trustees of the Leland Stanford Jr. University
Cole Stanley Z.
Intevac, Inc.
McClellan William
O'shea Sandra
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