| 摘要 |
PURPOSE: A step motor is provided to insert a magnet into a case, supporting one end of a shaft having conventional bobbins, yoke and lead screw formed using a sliding guide, and vertically apply a pre-pressure to the shaft using a leaf spring tightly closed to the sliding guide by a stopper caulked in an aperture of the case. CONSTITUTION: Two yokes(67) are respectively inserted into first/second bobbins(64,64a) having coils wound so that teeth(66) of the yokes can be engaged with each other. A magnet(69a) which a shaft(69) having a lead screw(68) formed is inserted into is inserted into an internal diameter part of the yoke(67) of a case(60), which is covered by a stopper(70). A sliding guide(80) is inserted to face the yoke(67) positioned in an aperture(65) of the case(60), supports one end of the shaft(69) as well as maintains the rotation center of the shaft. A leaf spring(90) applies pre-pressure to the shaft(69) in a direction perpendicular to the shaft. A left screw supporter(101) of a bracket(100) is coupled to a bottom(61) of the case(60).
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