Optical information reading-out apparatus

An optical information read out apparatus comprising a light source, a record medium including an information track spirally or concentrically recorded thereon, an optical system including an objective lens movably supported by its holding body, said optical system receiving a light from said light source and projecting a read out light spot onto said record medium, and a focusing and tracking mechanism for driving said objective lens so as to correct a relative displacement between said information track and said read out light spot, said mechanism including a first leaf spring having one end connected to said objective lens or its holding body and another end connected to a first supporting member, a second leaf spring having one end connected to said objective lens or its holding body and another end connected to a second supporting member, said first and second leaf springs being symmetrically arranged with respect to an optical axis of said objective lens or a plane inclusive of said optical axis and a track direction, and a pair of opposed electromagnets between which are arranged said first and second leaf springs and said objective lens with or without its holding body, either one or both of said leaf springs and said objective lens holding body being formed of magnetic material.