Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-06-17
1985-10-15
Rubinson, Gene Z.
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 526
Patent
active
045478082
ABSTRACT:
A control circuit for automatically opening and closing the diaphragm of the objective lens of a closed circuit television (CCTV) camera, including a variable gain inverting amplifier for amplifying and inverting video signals from the camera, a voltage doubler and rectifier coupled to the output of the inverting amplifier, a reference voltage generator, a diaphragm control assembly for comparing said reference voltage with signals output from said voltage doubler and opening and closing said diaphragm in response to the results of said comparison, and a series circuit including a clipping diode and variable resistor coupled between the input and output of the inverting amplifier. The clipping diode clips negative going portions of signals output from said inverting amplifier and adjustment of said variable resistor selects different light modes by controlling the degree of clipping.
REFERENCES:
patent: 3918046 (1975-11-01), Rivers
patent: 4268866 (1981-05-01), Rodgers, III
patent: 4300167 (1981-11-01), Miller et al.
patent: 4451851 (1984-05-01), Arai et al.
patent: 4472743 (1984-09-01), Ogasawara et al.
Arai Masayuki
Ogasawara Terumi
Shikano Tohru
Asahi Seimitsu Kabushiki Kaisha
Lev Robert
Rubinson Gene Z.
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