Photographing lens position device in automatic focusing camera

Details Photographing lens position device in automatic focusing camera Photographing lens position device in automatic focusing camera

1984-10-26

1986-03-18

Adams, Russell E.

3541951, G03B 310

Patent

active

045764603

ABSTRACT:
A device for positioning a photographing lens to focus the lens on an object is disclosed. The device comprises distance detecting means for detecting a distance to an object to provide an output signal, the distance detector detecting the distance when the object is positioned in the range of ordinary photographing distances and in the range of distances shorter than the ordinary photographing distances, a position determining system for determining the position of the photographing lens in the direction of the optical axis according to the output signal, and a drive system for responding to an output of the position determining system. The drive system includes a cam which is displaced to move the photographing lens along the optical axis. The cam has a first displacement region for operating the photographing lens when the object is in the range of ordinary photographing distances, and a second displacement region for operating the photographing lens when the object is in the range of distances shorter than the ordinary photographing distances. The first and second displacement regions are so shaped that, with respect to an amount of displacement of the cam, the amount of movement of the photographing lens with the first displacement region is larger than that with the second displacement region.

REFERENCES:
patent: 4206990 (1980-06-01), Imura et al.
patent: 4274720 (1981-06-01), Tsujimoto

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