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Title: AUTOMATIC LIGHT CONTROL

A control system for a projection kinescope used in a facsimile scanning system and, in particular, meams for maintaining substantially constant the light emanating from the flying spot on the face of the kinescope are described. In general, the invention provides a feeler member disposed in such a position with respect to a projecting lens as to intercept a portion of the light striking the lens. Suitable circuitry in conjunction with a photomultiplier tube provides a signal proportional to the light intensity of the flying spot. The grid bias on the kinescope is controlled by this signal to maintain the intensity of the spot substantially constant.
Authors:
Publication Date:
OSTI Identifier:
4341699
Report Number(s):
US 2804550
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-58
Research Org:
Originating Research Org. not identified
Country of Publication:
United States
Language:
English
Subject:
PATENTS; CAMERAS; CIRCUITS; CONTROL SYSTEMS; LENSES; LIGHT; PATENT; PHOTOMULTIPLIERS