POLYGON MIRROR SCANNER MOTOR

摘要

PROBLEM TO BE SOLVED: To minimize an eccentric rate inside a bearing by solving the precession of a sleeve by a bearing load generated at the iron core part of a coil and increase accuracy and life in a polygon mirror scanner motor used for laser scanning of a laser beam printer and a laser beam copying machine.

SOLUTION: The folded part 104a of one of two sets of dynamic pressure generating grooves is disposed at a position facing a polygon mirror 106, and the folded part 105a of the other dynamic pressure generating groove is disposed at a position facing the core part 108 of the coil generating a magnetic rotating force so that a bearing load by the polygon mirror 106 and the bearing load generated at the core part 108 of the coil are pivotally supported at positions where these dynamic pressure generating grooves face each other to minimize the eccentric rate inside the bearing. As a result, the polygon mirror scanner motor increased in accuracy and life can be provided.

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