Automatic focus indicating device for camera

Details Automatic focus indicating device for camera Automatic focus indicating device for camera

1980-02-06

1982-03-16

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

354 53, 354198, 354289, 250201, G03B 7081, G03B 310

Patent

active

043198139

ABSTRACT:
An automatic focus detecting and indicating device for an camera in which a contrast signal is coupled through first and second analog switches directly to a difference circuit and through a peak hold circuit, respectively. A third analog switch is coupled so as to discharge the value stored in the peak hold circuit. The three switches are operated by a control circuit which in turn operates in accordance with the direction of movement of the lens and the detection of a rising edge of the contrast signal so as to prevent the generation of a false focus signal at other than the point of true focus.

REFERENCES:
patent: 3886567 (1975-05-01), Matsumoto
patent: 4045805 (1977-08-01), Saito
patent: 4206394 (1980-06-01), Flandorfer

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