Device for determining whether focus detection may be accurately

Details Device for determining whether focus detection may be accurately Device for determining whether focus detection may be accurately

1993-11-04

1996-05-14

Gellner, Michael L.

G03B 1336

Patent

active

055172733

ABSTRACT:
A camera having focus detection capability which decides whether or not focus detection is possible. The camera is capable of accommodating interchangeable lenses, and determines whether focus detection is possible for an optional combination of interchangeable lens and camera based upon characteristic data for the interchangeable lens and characteristic data for a focus detection device. The characteristic data for the interchangeable lens is data representing an exit beam for an optional image height which is stored in a lens memory. The data representing the exit beam may be the position and size of plural circular apertures for the interchangeable lens. The characteristic data for the focus detection device is stored in a camera body memory and represents a position and shape of a rangefinder image point. When focus detection is possible, a photographic lens is driven according to the focus detection result.

REFERENCES:
patent: 4816663 (1989-03-01), Utagawa et al.
patent: 4857720 (1989-08-01), Karasaki
patent: 4903065 (1990-02-01), Taniguchi et al.
patent: 5003336 (1991-03-01), Karasaki et al.

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