Magnet assembly and a voice coil motor using such magnet assembl

Details Magnet assembly and a voice coil motor using such magnet assembl Magnet assembly and a voice coil motor using such magnet assembl

1993-03-11

1994-07-12

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335306, 335229, 360106, 310154, H01F 702, H01F 708, G01B 700

Patent

active

053292677

ABSTRACT:
Magnet assemblies for installation into a voice coil motor is described. A pair of magnetic pieces are molded into circular arc shapes of different radii and positioned concentrically across a gap. The ends of such the pair of magnet pieces, are joined to a similarly-molded other pair of magnet pieces. The direction of magnetization of the former pair of magnet pieces is reverse that of latter pair of a magnet pieces. On the upper curved surface of each of the two units of lower magnet pieces of smaller radius, a cut plane, for example, is formed in order to provide unbalanced cubic volume between one half and the other half from the center plane of a magnet piece, thus increasing the gap magnetic flux density being generated inside the gap at the sections of larger cubic volume, thereby improving overall evenness of the gap magnetic flux density distribution.

REFERENCES:
patent: 4945330 (1990-07-01), Arita

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