The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1976
Filed:
May. 06, 1974
Christian Pepin, Paris, FR;
Thomson-CSF, Paris, FR;
Abstract
A low light level image pick-up tube is protected from excessive illumination intensity damage by controlling a very high voltage assembly supplying the tube. The tube comprises in a preferred embodiment a plurality of image intensifier stages in cascade preceding an electron gun from which a video signal is provided by electronic scanning. A mean level video regulation circuit provides from the video signal an output signal used for controlling the supply voltage value to at least one of the image intensifier stages including the last one i.e. that preceding the electron gun. Further, a signal proportional to the supply current to the last image intensifier stage is used for controlling the supply voltage value of the input image intensifier stage which receives focussed radiation from an observed field.