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Automatic focus control for facsimile camerasAn electronic circuit for controlling the focus of facsimile cameras is described. The circuit consists of balanced a.c. amplifiers, two square law function generators, and a differential amplifier and power drive. The invention includes a method for maintaining the imaging sensor at the expected location of the focal plane as the facsimile camera scans a scene or terrain. A block diagram of the electronic circuitry is provided.
Document ID
19750006942
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Sinclair, A. R. (NASA Langley Research Center Hampton, VA, United States)
Burcher, E. E. (NASA Langley Research Center Hampton, VA, United States)
Katzberg, S. J. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 3, 2013
Publication Date
December 24, 1974
Subject Category
Instrumentation And Photography
Accession Number
75N15014
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-3,857,031|NASA-CASE-LAR-11213-1
Patent Application
US-PATENT-APPL-SN-406715

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