Automatic focusing device for use in a camera

Details Automatic focusing device for use in a camera Automatic focusing device for use in a camera

1988-03-17

1989-04-25

Perkey, W. B.

354409, 35419512, 350430, G03B 310, G03B 500, G03B 1318, G03B 1522

Patent

active

048252379

ABSTRACT:
An automatic focusing device for use in a camera using photographic lenses having a variable power region in which an entire focal length of a variable power optical system comprising a variable power lens group, a focusing lens group and a macro lens group disposed on an identical optical axis can optionally be set by the variable power lens group between a shortest focal length and a longest focal length, a macro region capable of macro photographing by the macro lens group, a variable power focusing region from an infinite position to a nearest position on the optical axis corresponding to an object distance from an infinite distance to a nearest distance and a macro focusing region capable of macro photographing in a predetermined region disposed from a nearest position on a side opposite to an infinite position.

REFERENCES:
patent: 4609260 (1986-09-01), Kawai
patent: 4774540 (1988-09-01), Taniguchi et al.

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