Magneto-optical disk recording and reading apparatus and method wherein the recording head is controlled in the radial direction of the disk to a desired position

A magneto-optical disc recording apparatus including a magneto-optical disc formed with target tracks, comprising:

• a magnetic head for applying to a magneto-optical disc a vertical magnetic field modulated in accordance with data to be recorded onto the magneto-optical disc which has target tracks;
• an optical head which is fed in a radial direction of the magneto-optical disc and is mounted together with said magnetic head and for irradiating a light beam upon the magneto-optical disc from the side of a substrate of the magneto-optical disc;
• a position detector providing an error signal and detecting the position of a movable portion of said optical head in the radial direction of the magneto-optical disc so as to determine the radial position of said magnetic head and said optical head relative to said target tracks and producing an error signal proportional to the radial deviation from said target tracks;
• a controller for controlling said magnetic head and said optical head so as to start recording by said optical head and said magnetic head when said error signal is less than a predetermined amount;
• wherein said position detector is provided on said optical head;
• and
• wherein said optical head includes a pair of actuators for moving an objective lens in a focusing direction and a tracking direction, and further includes a moving device for moving said optical head in a radial direction of the magneto-optical disc.