Patent ID: 7278149
Filing Date: 2007-10-02
Classification: G11B

Abstract:
1. An actuator comprising a magnet and a movable member, the magnet being positioned to confront with the movable member, the movable member having a coil and being movable in a first direction and a second direction perpendicular to the first direction by cooperation of the magnet and the coil, the magnet comprising: a pole area boundary line including a first line directed in the first direction and a second line directed in the second direction; a first pole area which is enclosed by the pole area boundary line and which includes a corner part defined by the first line and the second line; and a second pole area adjacent the first pole area via the pole area boundary line and having a polarity different from a polarity of the first pole area, wherein the first pole area includes a protruding area formed, at a side of the second pole area with respect to the corner part, by the first line and the second line both protruding to the side of the second pole area near the corner part.