| 摘要 |
PROBLEM TO BE SOLVED: To provide a centering magnet in which deviation of magnetizing strength is eliminated, and degradation of focusing performance and resolution of the image is reduced. SOLUTION: In the centering magnet 10a, a groove or a through hole is provided on one side of opposing magnetic poles, and the quantity of resin in the region on the opposite side to the gate hole side of the center where the density of the magnetic powder becomes higher is lessened, thereby the deviation of the magnetizing strength is reduced. COPYRIGHT: (C)2004,JPO
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