Yoke member for voice coil motor

Details Yoke member for voice coil motor Yoke member for voice coil motor

1991-12-31

1993-04-13

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Linear

310 27, H02K 4100

Patent

active

052025950

ABSTRACT:
A voice coil motor is disclosed which comprises a yoke member composed of a central portion forming magnetic path, left/right fringes and upper/lower fringes, a moving coil wound movably around the central portion of the yoke member, and permanent magnets being adhered on the upper/lower fringes of the yoke member and applying magnetic field to the moving coil, wherein the yoke member is formed by overlapping at least two members of different permeabilities so as to uniform each reluctance of lines of magnetic force being generated from the permanent magnets and flowing through the yoke member.

REFERENCES:
patent: 3619673 (1971-11-01), Helms
patent: 4652779 (1987-03-01), Wilcox
patent: 5113099 (1992-05-01), Wong et al.

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