Patent ID: 7483222
Filing Date: 2009-01-27
Classification: G11B

Abstract:
1. An objective lens actuator comprising: a base member having a yoke; an objective lens holder to which a plurality of coils are fixed for holding an objective lens; a plurality of rod-like elastic members to hold the objective lens holder in a movable manner; a permanent magnet to compose a magnetic circuit along with the yoke; and a gel holder having a plurality of gel holding holes inside of which a gel material is filled, and enabling vibration of the rod-like elastic members to be attenuated by inserting the rod-like elastic members into the gel holding hole, wherein the objective lens holder is moved by an electromagnetic action between the permanent magnet and the coils to move the objective lens, a gel injection hole connected to the gel holding hole is made by boring in a round shape on a side surface or an upper surface of the gel holder, an inner diameter of an outer surface side opening of the gel injection hole is made larger than an outer diameter of a needle of an injector which is utilized for injection of the gel material, and an inner diameter of an inner surface side opening of the gel injection hole is made smaller than an outer diameter of the needle.