Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1983-06-16
1985-09-17
Rubinson, Gene Z.
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 526
Patent
active
045424101
ABSTRACT:
A control circuit for automatically opening and closing the diaphragm of the objective lens of a closed circuit television (CCVT) camera including a variable gain inverting amplifier for amplifying and inverting video signals from the camera, a voltage doubler and rectifier with an adjustable capacitor coupled to the output of the inverting amplifier, a voltage level shifter coupled to the output of the voltage doubler for lowering signals output therefrom by a predetermined voltage, a power supply for providing bias voltage to said control circuit, an intermediate voltage supply circuit for providing a signal reference voltage to said circuit which is intermediate to the value of said bias voltage, and a comparator circuit for comparing the intermediate voltage with the signal output from said level shifter and opening or closing the diaphragm based on the results of the comparison.
REFERENCES:
patent: 3918046 (1975-11-01), Rivers
patent: 4268866 (1981-05-01), Rodgers
patent: 4300167 (1981-11-01), Miller et al.
patent: 4451851 (1984-05-01), Arai et al.
patent: 4472743 (1984-09-01), Arai et al.
Arai Masayuki
Ogasawara Terumi
Shikano Tohru
Asahi Seimitsu Kabushiki Kaisha
Lev Robert
Rubinson Gene Z.
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