Focus detecting device and image signal amplifier circuit theref

Details Focus detecting device and image signal amplifier circuit theref Focus detecting device and image signal amplifier circuit theref

1986-12-24

1988-08-09

Perkey, W. B.

G03B 300

Patent

active

047631546

ABSTRACT:
An image signal amplifier circuit includes an amplifier for amplifying an image signal from a focusdetecting self-scanned image sensor, and a monitor photodetector for detecting the brightness of an object to be photographed. The amplification degree of the image signal is controlled by an automatic gain controller in the amplifier based on an output signal from the monitor photodetector so that the image signal as amplified will be of a constant level. An offset voltage is added to an output signal from the amplifier.

REFERENCES:
patent: 3906389 (1975-09-01), Matsumoto et al.
patent: 3949162 (1976-04-01), Malueg
patent: 4217608 (1980-08-01), MacGregor et al.
patent: 4567527 (1986-01-01), Yokomizo
patent: 4571047 (1986-02-01), Hirai
patent: 4618235 (1986-10-01), Ishida et al.

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