Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1986-08-06

1989-06-20

Perkey, W. B.

G03B 300

Patent

active

RE0329592

ABSTRACT:
An automatic focusing apparatus for use with a camera of the type having two interchangeable lenses with different focal lengths, incudes a ranging device for finding in which distance range is located an object to be photographed, i.e., close range or long range. The ranging device is capable of shifting the position of the boundary between short range and long range when interchanging lenses in order to widen the limits of the range in which either of the lenses can be focused better.

REFERENCES:
patent: 4119983 (1978-10-01), Tanaka
patent: 4123765 (1978-10-01), Isono
patent: 4204760 (1980-05-01), Kobayashi
patent: 4367934 (1983-01-01), Matsui
patent: 4459004 (1984-07-01), Morizumi
patent: 4490031 (1984-12-01), Mineshima
patent: 4505566 (1985-03-01), Noguchi
patent: 4643554 (1987-02-01), Ogawa

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