In-focus detecting device

Details In-focus detecting device In-focus detecting device

1989-10-06

1995-03-07

Adams, Russell E.

Television

Camera, system and detail

Optics

354402, H04N 5232, G03B 1336

Patent

active

053963369

ABSTRACT:
An in-focus detecting device comprising a photo-electric converter element for converting an object image formed on the image receiving surface thereof through an image forming lens, a drive mechanism for controlling the focusing position of the lens, a focus degree detecting circuit for detecting the degree of focus in a prescribed distance measuring frame of the image receiving surface and the degree of focus outside the frame on the basis of the output signal of the photo-electric converter element, and a control circuit, responsive to the output of the focus degree detecting circuit representing that the degree of focus in the distance measuring frame is below a prescribed level, for comparing the degree of focus in the distance measuring frame with the degree of focus outside the frame to determine the direction of the image forming lens to be driven.

REFERENCES:
patent: 4614975 (1986-06-01), Kaite

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