Focussing apparatus for camera with zoom lens

Details Focussing apparatus for camera with zoom lens Focussing apparatus for camera with zoom lens

1989-01-31

1990-04-03

Adams, Russell E.

354402, G03B 300

Patent

active

049144642

ABSTRACT:
A focussing apparatus and a focus correcting apparatus both derive information representing a distance from an AF sensor. A CPU stores lens travels at the telephoto end position, and distance information is utilized to retrieve one of the lens travels. A zoom coefficient is found in accordance with a zoom encoder value, and the CPU performs an arithmetic operation to derive a lens travel for a particular focal length which is currently being used. The zoom encoder value is also used to read deviation data D.sub.k, which relates to a variation from camera to camera, from E.sup.2 -PROM, and such data is used to correct the lens travel to determine a final lens travel.

REFERENCES:
patent: 4560267 (1985-12-01), Nakai
patent: 4572645 (1986-02-01), Yoshida et al.
patent: 4783676 (1988-11-01), Aihara et al.
patent: 4825239 (1989-04-01), Suda et al.
patent: 4829331 (1989-05-01), Aihara
patent: 4831402 (1989-05-01), Fujita et al.
patent: 4841322 (1989-06-01), Kansaki et al.
patent: 4841325 (1987-06-01), Hoshino et al.

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