Automatic and manual focus control lens barrel structure

Details Automatic and manual focus control lens barrel structure Automatic and manual focus control lens barrel structure

1979-11-26

1981-06-09

Griffin, Donald A.

354 25, G03B 302, G03B 708

Patent

active

042721741

ABSTRACT:
In a lens barrel for automatic and manual focus control of a camera, a non-movable barrel is adapted to be mounted on the camera and a first movable barrel is movably carried by the non-movable barrel with a second movable barrel movably carried by the first movable barrel and a third movable barrel movably carried by the second movable barrel for carrying at least one lens group for focussing by means of axial movement of the lens group. The third movable barrel is guided for movement without rotation relative to the non-movable barrel and the second movable barrel is shifted along the optical axis of the lens group relative to the non-movable barrel. The third movable barrel is shifted along the optical axis relative to the non-movable barrel with either the shifting of the second movable barrel or the shifting of the third movable barrel being for automatic focus control operation and the other being for manual focus control operation.

REFERENCES:
patent: 4057327 (1977-11-01), Kumazawa
patent: 4110769 (1978-08-01), Schutz et al.
patent: 4149792 (1979-04-01), Fraser et al.
patent: 4154157 (1979-05-01), Tamura et al.
patent: 4191460 (1980-03-01), Fujiki

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