Patent ID: 6643229
Filing Date: 2003-11-04
Classification: G11B

Abstract:
An optical pickup apparatus comprising:an objective lens; lens holding means for holding said objective lens, the lens holding means being formed so as to have a rectangle frame shape; a first lens drive means including a yoke having a portion inserted into the rectangle frame of said lens holding means, a magnet fixed to said inserted portion, a focusing coil for driving said lens holding means in a focusing direction, and tracking coils for driving said lens holding means in a tracking direction, said focusing coil being so fixed on said lens holding means as to surround said inserted portion and said magnet, said tracking coils being fixed to a position facing said magnet on said lens holding means;. elastic support members fixedly secured at one of the ends thereof to said lens holding means to support said lens holding means in a manner to allow movement of said lens holding means and feeding electric current to said focusing coil and said tracking coils; a support fixing member supporting and fixing said elastic support members, the other ends of said elastic support members being fixedly secured to the support fixing member, the support fixing member being supported by said yoke; and a second lens drive means including two tilt magnets which are disposed on a surface of said lens holding means facing said support fixing member and are arranged along the tracking direction, two iron cores fixed on a surface of said support fixing member facing said lens holding means and tilt coils which are mounted on said iron cores and are so arranged as to face said tilt magnets, wherein: said second lens drive means is driven independently of said first lens drive means and drives said lens holding means in a direction inclined relative to said focusing direction or said tracking direction, and said iron cores are provided with projections on each of upper and lower sides in the focusing direction so that upper and lower portions of the iron cores have a generally L-shaped cross-section.