Electromagnetic actuator and lens drive mechanism using the same

Details Electromagnetic actuator and lens drive mechanism using the same Electromagnetic actuator and lens drive mechanism using the same

1995-02-17

1996-03-12

Ben, Loha

Optical: systems and elements

Lens

With support

359822, 310 13, G02B 702

Patent

active

054991439

ABSTRACT:
An electromagnetic actuator for moving a focusing lens along an optical axis includes a lens barrel having two supporting rails, a set of cylindrical inner and outer yokes incorporating a pair of magnets, a lens holder which holds the lens and is supported slidably on the supporting rails by means of a bearing device and rail guide provided on two arms of the lens holder, a coil wound on a bobbin which is fixed on the lens holder and located so that the coil is exposed to the magnetic field of the magnets inside the yokes. The yokes have cut portions, allowing the arms of lens holder to cut into the yokes when the lens is moved.

REFERENCES:
patent: 4948235 (1990-08-01), Akitake
patent: 4961635 (1990-10-01), Kondo et al.
patent: 5182481 (1993-01-01), Sakamoto
patent: 5220461 (1993-06-01), Inoue et al.
patent: 5225941 (1993-07-01), Saito et al.

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