Phase difference detector with analog signals

Details Phase difference detector with analog signals Phase difference detector with analog signals

1987-09-11

1989-07-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354408, G01J 120

Patent

active

048496197

ABSTRACT:
A phase difference detector of the type capable of distinguishing a focused state by detecting relative positions of a pair of optical images obtained from an object, comprises sensor means adapted to photoelectrically convert the pair of optical images and to output a first analog electrical signal corresponding to one of the optical images and a second analog electrical signal corresponding to the other optical image, the signals being generated by the photoelectric conversion, at a predetermined period and in a non-destructive manner, and analog arithmetic means for subjecting the pair of analog electrical signals output from the sensor means to a correlative arithmetic operation.

REFERENCES:
patent: 4178098 (1979-12-01), Asano et al.
patent: 4559446 (1985-12-01), Suzuki
patent: 4560863 (1985-12-01), Matsumura et al.
patent: 4575626 (1986-03-01), Oinoue et al.
patent: 4602153 (1986-07-01), Suzuki
patent: 4621191 (1986-11-01), Suzuki et al.

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