| 简介 |
PROBLEM TO BE SOLVED : To solve the problem wherein a foreign matter formed of a magnetic metal is attracted by magnetic force leaking from an end face of a magnet and it adheres to a lead or a land of a circuit component surface-mounted on a circuit board, resulting in a short-circuit when a rare earth resin magnet is used for the magnet of a brushless motor in which a drive-control circuit used for a laser beam printer is integrated with a motor.
SOLUTION : A region affected by magnetic force leaking from the end face 4a of the magnet 4 and the lead L or the land R of the circuit component are arranged so that they do not interfere with each other, or the lead L or the land R of the circuit component arranged in the region affected by magnetic force is coated with an insulating material 22. Thus, output of the motor is made larger, or efficiency is improved with high reliability maintained.
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