Patent ID: 6208046
Filing Date: 2001-03-27
Classification: F16C,H02K

Abstract:
A stepping motor, comprising:a stator having both a coil and a yoke fixedly mounted to a first support plate;a rotatable shaft having an insert portion within said stator and an exposed portion outside the stator, the exposed portion being externally threaded to form a lead screw, said insert and exposed portions each having a dome-shaped end;a first holder having a dent rotatably holding the dome-shaped end of the insert portion while being brought into point contact therewith; anda second holder having a dent at a first end thereof rotatably holding the dome-shaped end of the exposed portion while being brought into point contact therewith, said second holder being supported at a second end thereof by a second support plate while being normally and elastically biased by spring means in an axial direction of the shaft, thus elastically supporting the rotating shaft in the axial direction, said spring means being interposed between said second support plate and a flange part of said second holder which extends outwardly from said second holder around said dent.