Automatic focus indicating device for camera

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

1980-02-04

1981-09-01

Gellner, Michael L.

G03B 310

Patent

active

042868505

ABSTRACT:
A device for detecting and indicating the focus position of a camera from the contrast signal. A peak value detector holds the maximum value of a contrast signal produced in the camera. The stored signal is compared with the contrast signal itself as the direction of the lens is reversed and the focus signal is generated when the two signals are equal. The values stored in the peak detecting circuit is reset as the shutter button is pushed as the lens commences movement in the forward direction to prevent erroneous generation of the focus signal.

REFERENCES:
patent: 4156563 (1979-05-01), Kato et al.
patent: 4230401 (1980-10-01), Tokutomi et al.

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