Recording and/or reproducing apparatus using opto-magnetic disc

An apparatus for recording and reproducing a signal on and out of an opto-magnetic disc comprising

• a spindle for rotating the opto-magnetic disc;
• a spindle motor having an output shaft coupled with said spindle;
• an erasing and reproducing opto-magnetic head unit having outer and inner opto-magnetic heads which are separated from each other in a radial direction of the opto-magnetic disc by a predetermined distance;
• a recording and reproducing opto-magnetic head unit having outer and inner opto-magnetic heads which are separated from each other in the radial direction by said predetermined distance, said recording and reproducing otpo-magnetic head unit being arranged diametrically in opposition to each other with respect to a center axis of the opto-magnetic disc;
• means for having said erasing and reproducing opto-magnetic head unit in the radial direction of the opto-magnetic disc;
• means for moving said recording and reproducing opto-magnetic head unit in the radial direction of the opto-magnetic disc;
• means for producing an erasing bias magnetic field at a position of the erasing and reproducing opto-magnetic head unit;
• and
• means for producing a recording bias magnetic field at a position of the recording and reproducing opto-magnetic head unit.