Patent ID: 8082813
Filing Date: 2011-12-27
Classification: F16H,G02B,G11B,Y10T

Abstract:
1. An actuator for displacement of a holder along a displacement axis comprising: a driver for driving a lead screw; the lead screw having a screw thread with a pitch and a pitch angle; the holder having a holder thread arranged to cooperate with the screw thread for the displacements of the holder, the holder having a reference-surface; and a home-position device having a stopping-surface for stopping the displacement of the holder when the reference-surface of the holder contacts the stopping-surface, wherein the stopping-surface and the reference-surface form an acute angle greater than zero with a plane perpendicular to the displacement axis of the holder and have a same direction as the pitch angle of the lead screw, and wherein the acute angle of the at least one of the stopping-surface and the reference-surface is larger than the pitch angle of the screw thread.