Patent ID: 8130600
Filing Date: 2012-03-06
Classification: G11B

Abstract:
1. A drive device mounted on an optical head that records information in and/or reproduces information from an optical disk, comprising: a holding member configured to hold a movable member; a supporting member configured to support the holding member in a linearly movable manner; a lead screw member supported in a rotatable manner and provided with a screw thread formed of a first slope and a second slope each in a spiral shape on an outer circumferential surface thereof; and a drive member configured to rotate the lead screw member, wherein the holding member includes: a rack portion disposed between the supporting member and the lead screw member and having a slope that abuts on the first slope so as to convert a rotational motion of the lead screw into a linear motion; and a regulation portion that regulates a relative position of the rack portion with respect to the lead screw member so that the rack portion does not abut on the second slope, and wherein the drive device further comprises: a first pushing member that pushes the rack portion along an axial direction of the supporting member so that the slope of the rack portion abuts on the first slope; and a second pushing member that pushes the rack portion toward the lead screw member so that the slope of the rack portion abuts on the first slope.