Patent ID: 7843619
Filing Date: 2010-11-30
Classification: G02B,H02K

Abstract:
1. A scanner motor, comprising: a rotor case for mounting a magnetic disc or a polygon mirror thereon; a rotating shaft which is rotatable and axially supports the rotor case; a hollow cylindrical bearing for rotatably supporting the rotating shaft; a bearing holder mounted to an outer circumference of the bearing to support the bearing; a stator mounted to an outer circumference of the bearing holder to form an electric field which rotates the rotor case; a housing shaft fitted over an outer circumference of the rotating shaft and seated on the rotor case, the housing shaft being coupled at an outer circumference thereof to the polygon mirror; at least one hole formed in the housing shaft, absorbing stress occurring during welding, and reducing variation in levelness of the polygon mirror; and a coupling part for coupling an edge of the hole with the polygon mirror.