Patent ID: 6882073

Claim:
A linear actuator comprising: a stator unit having coils obtained by a winding of a magnet wire arranged on a stator yoke, and pole teeth arranged on an inner periphery of the stator unit; a rotor unit rotatably disposed in a central portion of said stator unit with a given gap opposing said pole teeth, said rotor unit including a field magnet arranged on an outer periphery of a resin portion made of a resin material and conversion means arranged on a portion of an inner periphery of said resin portion; said conversion means being made of a material having a small friction coefficient and sufficient abrasion resistance, and said rotor unit being integrally constituted by insert molding said filed magnet and said conversion means; magnet stoppers arranged on both end faces of said field magnet by an insert molding process; and, an output shaft having a screw thread on at least a portion of an outer periphery of said output shaft for engaging with said conversion means, said output shaft disposed in the central portion of said rotor unit so as to be slidable in an axial direction thereof.