Patent ID: 8115355

Claim:
A polygon mirror scanner motor comprising: a rotor composed of a rotor frame, a rotor magnet provided in the inner wall of the rotor frame, a rotor boss having a circular tube part and provided in the rotor frame, and a polygon mirror mounted on the rotor boss, a winding assembly composed of a stator core formed by laminating magnetic members and disposed oppositely to the rotor magnet, and a stator coil wound on the stator core, a stator composed of the winding assembly, and an iron plate circuit board having a through-hole, a shaft fixed to the through-hole by laser welding, and a dynamic pressure bearing provided with a dynamic pressure groove for generating a dynamic pressure in the radial direction, in either one of the circular tube part of the rotor boss and the shaft, wherein the circular tube part of the rotor boss is supported by the shaft.