US 4,733,261 AGranted

Automatic focusing camera

AssigneeKonishiroku Photo Industry Co., Ltd.

InventorsHirokazu Gunshi, Minoru Yamada, Eiji Ito, Masaru Nagai, Kenji Miyama, Masataka Sawamura

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Abstract

An automatic focusing camera having a driving mechanism for moving a taking lens on the basis of a signal provided by a distance measuring device. The lens position is controlling by a cam member capable of being turned stepwise in one direction about the optical axis of a taking lens by a pulse signal given by the distance measuring device. The driving mechanism has a light quantity controlling movable coil member and a taking lens driving and controlling movable coil member. Both the light quantity controlling movable coil member and the taking lens driving and controlling movable coil member are disposed within a gap and exposed to a common magnetic field.

Claims22

Dependent claims

An automatic focusing camera comprising

(a) means for detecting a distance to an object and for generating a distance signal;
(b) means for converting said distance signal into a pulse signal having a pulse number corresponding to said distance;
(c) a lens;
(d) means for controlling a position of said lens, said means for controlling being capable of moving in a first direction;
(e) an electromagnetic driving means having a reciprocally moving element corresponding to said pulse signal,
said electromagnetic driving means driving said means for controlling stepwise in said first direction by an amount corresponding to said pulse number whereby said means for controlling is moved from at least one initial position to a focusing position;
and
(f) means for actuating said driving means for a period after an exposure of said object so that said means for controlling is moved in said first direction from said focusing position to one of said at least one initial position.

5 more elements

Dependencies are inferred from the claim text.