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:
Jun. 19, 1990
Filed:
Dec. 22, 1988
Applicant:
Inventor:
Lawrence H Gilligan, Charlottesville, VA (US);
Assignee:
Sperry Marine Inc., Charlottesville, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
358211 ; 2502 / ; 358228 ;
Abstract
An apparatus for automatically controlling the photocathode of an image intensifier employed as a high speed shutter in a television camera utilizes the video signals established by the camera to provide first and second pulses representative of the light level at the camera. The lengths of these pulses are compared to time intervals representative of light levels whereat switching is provided that selects between the first pulse control of the photocathode and control of the photocathode by a train of pulses gated within the time interval of the second pulse.