Patent ID: 7975275
Filing Date: 2011-07-05
Classification: G11B

Abstract:
1. An object lens actuator comprising: a lens holder for holding an object lens; a fixing portion for holding the lens holder; and first and second support members which are connected to the fixing portion and resiliently support the lens holder therebetween, wherein the lens holder has two opening portions for disposing a permanent magnet respectively, wherein the object lens actuator has four walls which are in the envelope of the two opening portions and which are perpendicular to a flat plate between the two opening portions, wherein the object lens is disposed asymmetrically with respect to the center line between the first support member and the second support member, wherein one of the four walls, which is in the opposite side to the object lens with respect to the center line and which is in the opposite side to the object lens with respect to the flat plate, is configured to be the thickest, and wherein one of the four walls, which is in the same side as the object lens with respect to the center line and which is in the same side as the object lens with respect to the flat plate, is thicker than a wall which is in the opposite side to the object lens with respect to the center line and which is in the same side as the object lens with respect to the flat plate.