Camera focus detecting device

Details Camera focus detecting device Camera focus detecting device

1979-12-10

1981-02-24

Gellner, Michael L.

354 31, G03B 310

Patent

active

042524253

ABSTRACT:
An automatic focus detecting device for a camera including a self-scanning type photoelectric element unit including plural minute photoelectric elements disposed in a plane corresponding to the position of the image forming plane of the photographing lens of the camera. The photoelectric element unit is scanned and the output signals from the unit are sampled and held over a scanning time period. The output signals from second adjacent ones of the elements are coupled to differential circuits the outputs of which are multiplexed onto a single output line. The peak value of the multiplexed signal is detected. When the peak value signal is at its maximum, the camera will be in proper focus.

REFERENCES:
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4180309 (1979-12-01), Miyata et al.

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