Shutter speed control circuit for an image pick-up apparatus

Details Shutter speed control circuit for an image pick-up apparatus Shutter speed control circuit for an image pick-up apparatus

1991-11-27

1994-01-11

Razavi, Michael T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821313, 358228, H04N 314, H04N 5335/5/238

Patent

active

052786595

ABSTRACT:
In an image pickup apparatus having an image pickup device and a shutter speed control circuit for controlling a shutter speed of the image pickup device, the shutter speed control circuit is comprised of a circuit for generating a sensor gate pulse in accordance with a vertical scanning timing so as to output an accumulated charge in the image pickup device, a circuit for generating a saw tooth signal being reset to a predetermined voltage level in accordance with the sensor gate pulse, an inclination of the saw tooth signal in just before reset to the predetermined voltage level being larger than the same in just after reset to the predetermined voltage level, a circuit for comparing a voltage level of an output signal of the image pickup device with the saw tooth signal so as to generate a gate pulse, and a circuit for controlling an accumulating period of the image pickup device in accordance with the gate pulse.

REFERENCES:
patent: 4541016 (1985-10-01), Ochi et al.
patent: 4872057 (1989-10-01), Woolfolk
patent: 4965671 (1990-10-01), Dielhof
patent: 5051833 (1991-09-01), Tsuji
patent: 5093716 (1992-03-01), Kondo et al.
patent: 5093727 (1992-03-01), Kakinuma et al.
patent: 5157502 (1992-10-01), Nakajima et al.

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