Patent ID: 7474018

Claim:
A reciprocation type linear driving actuator comprising: a moving object having a shaft pivoted to move reciprocally and linearly in an axial direction, and two permanent magnets each magnetized so that polarities of both end portions in the axial direction of the shaft are different, the two permanent magnets are configured to be fixed on the shaft with a predetermined distance between the two permanent magnets in the axial direction of the shaft; and a stator having a coil disposed between the two permanent magnets in the axial direction of the shaft in a normal condition when no current is supplied thereto, the coil being adjacent end faces of the two permanent magnets parallel to the axial direction of the shaft with a predetermined clearance, the stator generating a magnetic field for driving the moving object reciprocally and linearly in the axial direction of the shaft when alternating current is supplied.