Electromagnetic objective lens driving apparatus for optical data recording and reproducing apparatus

An electromagnetic objective lens driving apparatus of an optical disc data recording and reproducing apparatus, comprising:

• a carriage which is movable in a radial direction of an optical disc;
• an objective lens holder that supports an objective lens to converge laser beams onto the optical disc and which is supported on the carriage to move in focusing and tracking directions of the optical disc;
• focusing and tracking coils provided on the objective lens holder;
• focusing and tracking permanent magnets provided on the carriage to constitute focusing and tracking magnetic driving circuits in association with the focusing and tracking coils;
• and,
• a pair of magnetic members plated on a surface of the objective lens holder to receive magnetic attractive forces of at least one of the focusing and tracking permanent magnets;
• said magnetic members being located so that when the objective lens holder is in a neutral position, the magnetic attractive forces to be received by the magnetic members from at least one of the focusing and tracking permanent magnets are substantially identical, and when the objective lens holder is displaced from the neutral position, the magnetic attractive force to be received by one of the magnetic members is increased and the magnetic attractive force to be received by the other magnetic member is decreased, respectively.