Patent ID: 7358632

Claim:
A motor comprising: a stator provided with a coil to be supplied with electric current; a rotor adapted to rotate in said stator and provided with a magnet; an output shaft having a screw portion to be screwed into a threaded hole provided in said rotor; a regulating portion for axially moving said output shaft by preventing rotation of said output shaft and for sliding and holding said output shaft; a sliding portion, provided in said output shaft and adapted to slide in a sliding hole provided in said regulating portion; a pushing member for pushing said output shaft; a plate, fixed to said output shaft, for supporting said pushing member; and an accommodating member in which said plate and said output shaft are displaceably accommodated, wherein an extension portion is provided in said plate to extend from a support portion of said plate, which supports said pushing member, toward a direction of an inner surface of said accommodating member, wherein said regulating portion is formed in a boss disposed at an end of said motor, and a seal member is provided on said boss to cover a portion of said sliding hole, such that said seal member has an opening with end portions that are larger than an intermediate portion of said opening.