Patent ID: 7038825
Filing Date: 2006-05-02
Classification: B41J,G02B

Abstract:
1. An optical deflection device comprising: (a) a rotary unit comprising a rotary polygon mirror and a magnet; (b) a dynamic pressure bearing comprising a rotary bearing member for rotatably supporting the rotary unit and a fixed bearing member for engaging with the rotary bearing member; (c) a stator unit comprising a base member for supporting the fixed bearing member and a magnet coil for driving the rotary unit in cooperation with the magnet; and (d) a stabilizing member which is shaped as a solid cylinder and which is provided on an upper portion of the base member and in a vicinity of an outer circumference of the polygon mirror to stabilize air flow generated by rotation of the polygon mirror, wherein the stabilizing member has a height greater than a height of a lower surface of the rotary polygon mirror; and wherein the stabilizing member is provided in an area on a side of the polygon mirror between the polygon mirror and a side wall of a main body of the optical scanning apparatus.