VOICE COIL MOTOR, MAGNETIC CIRCUIT CONFIGURATION COMPONENT THEREFOR, AND MANUFACTURING METHOD THEREFOR
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United States of America
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Issued Date -
Dec 26, 2024
app pub date -
May 31, 2024
filing date -
May 31, 2024
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Abstract
A magnetic circuit configuration component for a VCM includes a pair of yokes, a pair of magnets provided on inner surfaces of the yokes, and a support member or a support column that maintains a gap between the magnets to fix the yokes to each other, the magnet is a rare earth sintered magnet having a surface on which coating is performed, a composition of the magnet consists of, by weight, R (R is one or more types of rare earth elements selected from Nd, Pr, Dy, Tb, Ce, La, and Gd) of 28% to 34%, Co of 2% or less, B of 0.5% to 2%, one or more types selected from Ni, Nb, Al, Ti, Zr, Cr, V, Mn, Mo, Si, Sn, Ga, Cu, and Zn as an additive of 2% or less, and the balance of Fe, and the coating includes a metal plating layer of a predetermined thickness and a metal oxide layer and/or a metal nitride layer of 0.01 μm to 2 μm.
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