Apparatus for protecting the target of an image-producing tube f

Details Apparatus for protecting the target of an image-producing tube f Apparatus for protecting the target of an image-producing tube f

1977-09-27

1980-05-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

358219, H01J 3126

Patent

active

042019311

ABSTRACT:
The invention contemplates circuit arrangements to protect the target of an image-producing tube from injuriously high local current densities, wherein detector means is responsive to produce an electrical pulse at onset of an unacceptably high local-illumination intensity condition at the cathode. The target-cathode excitation circuit includes switch means with a resistance-changing characteristic, and so connected to respond to the electrical pulse as to rapidly reduce electron flow between the cathode and target of the tube, upon occurrence of such electrical pulse output.

REFERENCES:
patent: 2911562 (1959-11-01), Fathauer
patent: 3435275 (1969-03-01), Bauman
patent: 3600520 (1971-08-01), Slark
patent: 3652792 (1972-03-01), Usagawa
patent: 3864594 (1975-02-01), Svensson

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