H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/69, 316/9
H01J 31/12 (2006.01) H01J 9/00 (2006.01) H01J 29/18 (2006.01) H01J 29/28 (2006.01) H01J 29/89 (2006.01) H01J 31/50 (2006.01)
Patent
CA 1204144
ABSTRACT An image producing tube having an image transmissive faceplate disposed adjacent an aligned output screen assembly including a layer of fluorescent material for producing a visible light image which is directed through the faceplate. The faceplate is controllably radiation-darkened by exposure for a limited time to ionizing radiation from an energizable source for enhancing contrast in the image transmitted through the faceplate.
410563
Smart & Biggar
Varian Medical Systems Inc.
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