Method of regenerating a lead monoxide target layer of a camera

Details Method of regenerating a lead monoxide target layer of a camera Method of regenerating a lead monoxide target layer of a camera

1977-01-21

1978-05-23

Lazarus, Richard B.

H01J 950

Patent

active

040907589

ABSTRACT:
The method comprises the steps of providing a camera tube having an evacuated envelope, a photoconductive layer primarily of lead monoxide, an activated getter and an unactivated getter within the envelope. After a period of operation or storage the tube exhibits a deterioration in spectral photosensitivity of the layer. The characteristic ratio of blue light photosensitivity is measured and when the ratio is less than about 80% the unactivated getter is activated to regenerate the tube.

REFERENCES:
patent: 3515927 (1970-06-01), De Haan et al.
patent: 3795432 (1974-03-01), Goldstein

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