Lens drive device

Details Lens drive device Lens drive device

1986-08-04

1988-06-07

Corbin, John K.

350255, 354400, G02B 704, G03B 300

Patent

active

047492694

ABSTRACT:
A lens drive device of the invention is disclosed comprising a motor drive for each lens of zoom means and focusing means, whereby a motor is made to have a concentric layer structure about a photographic optical axis, and a single magnetic circuit for the motor having the aforesaid layer structure is formed by a single permanent magnet.

REFERENCES:
patent: 4152060 (1979-05-01), Specht
patent: 4519691 (1985-05-01), Yamada et al.
patent: 4534624 (1985-08-01), Toda et al.
patent: 4605286 (1986-08-01), Sumi
patent: 4626077 (1986-12-01), Yamamoto

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