Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
Motor and method of manufacturing same
 A motor comprising: a rotor which is supported via a rotating shaft in a radial direction of the rotating shaft, the rotating shaft being disposed around a fixed shaft provided on the side of a stator to form a dynamic-pressure bearing; a stator-side thrust magnet disposed in the stator so as to support the rotor with respect to the stator in a thrust direction of the rotating shaft; a rotor-side thrust magnet disposed in the rotor; and a rotating main body portion mounted to the rotating shaft of the rotor and formed integrally by a resin magnetic material, in which a main magnet portion, an FG magnet portion for generating a speed-of-rotation detecting pulse, and a rotor-side thrust magnet portion serving as said rotor-side thrust magnet are respectively polarized at predetermined positions in the rotating main body portion. As a result, the reliability of an optical deflector in which the motor is used improves and the number of parts and the number of assembling processes are both reduced due to a simple structure. Further, a balance correction operation of the rotor is eliminated so as to allow a simple manufacturing operation, and even when the rotor is rotated at high speed, a stable optical scanning operation can be effected. 
Fuji Xerox Co., Ltd.
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inventional additional inventional inventional inventional inventional inventional
Hiromi Kohei Seiichiro Hiromu
Ito Shioya Kato Ono