Permanent magnet member for coil motor and voice coil motor

Electrical generator or motor structure – Dynamoelectric – Linear

Reexamination Certificate

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Details

C335S304000

Reexamination Certificate

active

07859140

ABSTRACT:
The permanent magnet member10for a voice coil motor (VCM) in accordance with the present invention comprises a magnet body1including a shorter periphery11, a longer periphery12located at a position separated from the shorter periphery11by a predetermined distance, and a pair of side peripheries13, 14connecting the shorter periphery11and longer periphery12to each other, the magnet body having a fan-shaped planar form; and a corrosion-resistant film (Ni plating film2) applied to a surface of the magnet body. The permanent magnet member10has a thickness whose maximum and minimum values yield a difference of 10 to 150 μm therebetween.

REFERENCES:
patent: 3768054 (1973-10-01), Neugebauer
patent: 4654618 (1987-03-01), Leupold
patent: 4810986 (1989-03-01), Leupold
patent: 4908816 (1990-03-01), Champagne et al.
patent: 5126713 (1992-06-01), Leupold
patent: 5329267 (1994-07-01), Endoh et al.
patent: 5576583 (1996-11-01), Umehara
patent: 5701040 (1997-12-01), Orlowska et al.
patent: 5805044 (1998-09-01), Leupold
patent: 2002/0039260 (2002-04-01), Kilmer
patent: A-05-284716 (1993-10-01), None
patent: A-11-140700 (1999-05-01), None
patent: A-2002-158105 (2002-05-01), None

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