Automatic focus adjusting device with a brightness dependent len

Details Automatic focus adjusting device with a brightness dependent len Automatic focus adjusting device with a brightness dependent len

1983-02-04

1985-03-19

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250201, 354402, G03B 310

Patent

active

045061505

ABSTRACT:
An automatic focus adjusting device comprises a charge accumulating type photoelectric conversion element array, a circuit for outputting from the output of the photoelectric conversion element array a signal indicative of the in-focus state of the image of an object to be photographed on a film surface, a circuit for modifying the newest detection signal on the basis of at least one past detection signal and outputting out a modification signal, a circuit for selecting one of the detection signal and the modification signal in accordance with the brightness of the object to be photographed, and a circuit for driving a picture-taking lens in a direction in which the image of the object to be photographed is focused on the film surface, on the basis of the signal selected by the selecting circuit.

REFERENCES:
patent: 4078171 (1978-03-01), Stauffer
patent: 4264810 (1981-04-01), Utagawa et al.
patent: 4447719 (1984-05-01), Ogasawara

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