Focus detecting device in camera

Details Focus detecting device in camera Focus detecting device in camera

1979-08-09

1981-03-10

Gellner, Michael L.

G03B 310

Patent

active

042550289

ABSTRACT:
A focalization detecting device in a camera utilizing a self-scanning type photoelectric device having a number of elements disposed at a position equivalent to the position of the image forming plane of a lens. A drive circuit drives the photoelectric element and a delay circuit delays a discrete output waveform of the photoelectric element the time corresponding to the scanning period of one or two elements. A difference circuit detects an output difference between the delayed waveform and the undelayed waveform. An absolute value circuit detects the absolute value of a difference output from the difference circuit and a peak value holding circuit holds a peak value in an absolute value waveform provided by the absolute value circuit in one scanning period of the photoelectric element, in such a manner that an output difference between said element is detected with a discrete photoelectric transducing output as it is. The maximum peak value output is provided when focus is obtained.

REFERENCES:
patent: 4135815 (1979-01-01), Masunaga et al.
patent: 4160587 (1979-07-01), Heiniger et al.
patent: 4173402 (1979-11-01), Horike et al.
patent: 4176928 (1979-12-01), Nakamura et al.

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