Air-dynamic bearing apparatus and polygon scanner motor

摘要

To provide an air-dynamic bearing apparatus having a radial dynamic bearing and thrust dynamic bearings by a small number of parts by using a material which is easy to fabricate and a polygon scanner motor using thereof, a rotor 26 made of a metal is supported by a small diameter portion 21A provided at a front end of a stator 21 made of a metal as a shaft portion by using an attaching hole 26A and a thrust plate 8 is fixed to an end portion of the small diameter portion 21A to thereby constitute bearing portions, low friction metal plating layers M1 through M3 are provided to respective bearing faces of the bearing portions, thereby, a radial dynamic bearing 51, a first thrust dynamic bearing 52 and a second thrust dynamic bearing 53 are formed.