Abstract: A voice coil motor type focusing actuator, which includes a fixed unit formed of a bracket having a rectilinear sliding groove and two magnets mounted in the bracket at two sides, a movable unit formed of a lens holder holding a lens and mounted inside the bracket and slidably coupled with its rectilinear sliding rail to the rectilinear sliding groove of the bracket and two coils respectively mounted on two sides of the lens holder corresponding to the magnets of the fixed unit, and a resilient holding down unit connected between the fixed unit and the movable unit to hold down the movable unit on the inside of the fixed unit.

Abstract: A motor-based linear actuator includes a coil assembly housed in a housing and holding two coils, a driving assembly surrounded by the coils and rotatable by the magnetic force induced upon connection of electric current to the coils, a linear guider fixedly, which is fastened to the housing and defines therein a sliding hole and a plurality of sliding grooves in the sliding hole, and an actuating assembly inserted through the sliding hole and coupled to the sliding grooves and threaded onto a front screw rod of the driving assembly for reciprocating motion along the sliding grooves during forward/backward rotation of the driving assembly.