LINEAR ACTUATOR

PROBLEM TO BE SOLVED: To provide a linear actuator which prevents a permanent magnet included in a mover from coming off. SOLUTION: The linear actuator has: a stator 10 including two coils 16 and 18 and three teeth 12-14 for forming magnetic poles arranged side by side along the central axis line O; a mover 20 which is provided so as to be reciprocated along the central axis line O and is configured such that a permanent magnet 23 is held between a pair of yokes 21 and 22 in a direction of the central axis line O; and two leaf springs 31 and 32 for holding the mover 20 in the direction of the central axis line O. When the coils 16 and 18 are not energized, the mover 20 is returned to a reference position within a movable range by energizing force of the two leaf springs 31 and 32, and at the same time, a gap C is secured between the mover 20 and the stator 10. The linear actuator is also equipped with a non-magnetic shaft 36 which penetrates the leaf springs 31 and 32 holding the mover 20 therebetween, along the central axis line O, and fastens the mover 20 and the leaf springs 31 and 32. COPYRIGHT: (C)2010,JPO&INPIT