Object lens head assembly

Claim 1

An object lens head assembly for use with an optical recording disc comprising: a linear motor disposed adjacent to a face of the optical recording disc and movable in a direction parallel to the face of the disc; first and second object lenses mounted on said linear motor to move therewith over first and second portions, respectively, of the face of the disc; first and second reflective mirrors mounted on said linear motor to move therewith along first and second paths, respectively, said first and second reflective mirrors being disposed in attitudes such that: (a) beams of light bearing information to be written onto the disc travelling along the first and second paths are reflected by said first and second mirrors, respectively, through said first and second object lenses onto the first and second portions of the disc, respectively, and (b) beams of light bearing information read from the disc passing from the first and second portions of the disc through said first and second object lenses are reflected by said first and second mirrors, respectively, onto said first and second paths, respectively; a transducer for receiving an electrical signal bearing information to be written to the disc and outputting a beam of light bearing the information to be written and for receiving a beam of light bearing information read from the disc and outputting an electrical signal bearing the information read; and a light beam shifting mechanism for directing the beam of light from said transducer bearing information to be written onto a selected one of the first and second paths, and for directing a beam of light bearing information read from the disc traveling along a selected one of the first and second paths to said transducer.