Patent ID: 6587410
Filing Date: 2003-07-01
Classification: G11B

Abstract:
A recording/reproduction apparatus recording and/or reproducing a signal to and/or from a magneto-optical recording medium, comprising:an optical head emitting a laser beam to said magneto-optical recording medium and detecting reflected light therefrom, a laser drive circuit driving a semiconductor laser in said optical head, a magnetic head applying a magnetic field to said magneto-optical recording medium, a magnetic head drive circuit driving said magnetic head, an equalizer removing waveform interference of a magneto-optical signal reproduced by said optical head, a servo circuit controlling tracking of a laser beam emitted from said optical head, and a control circuit, wherein said control circuit generates a first driving signal for said magnetic head to generate a magnetic field of a predetermined intensity modulated by a record signal, and provides said first driving signal to said magnetic head drive circuit, generates a second driving signal having an optimum phase difference from said first driving signal for said optical head to emit a pulse beam of a predetermined intensity, and provides said second driving signal to said laser drive circuit, after a signal is recorded on said magneto-optical recording medium by said first and second driving signals, generates a third driving signal altering intensity of the laser beam to reproduce the recorded signal and generates a fourth driving signal to set a provisional optimum laser beam intensity to reproduce the recorded signal, and provides said fourth driving signal to said laser drive circuit, determines a provisional optimum equalizer coefficient in removing waveform interference of a magneto-optical signal reproduced from said magneto-optical recording medium using a laser beam according to said fourth driving signal by said optical head, and sets the equalizer coefficient of said equalizer to the determined provisional optimum equalizer coefficient, following determination of the optimum phase difference between said first driving signal and said second driving signal, said provisional optimum laser beam intensity, and said provisional optimum equalizer coefficient, generates a fifth driving signal for said magnetic head to generate a magnetic field having the maximum magnetic field intensity, modulated by a record signal, and provides said fifth driving signal to said magnetic head drive circuit, generates a sixth driving signal having said optimum phase difference from said fifth driving signal for said optical head to emit a pulse beam whose intensity is altered, and provides said sixth driving signal to said laser drive circuit, generates a seventh driving signal having an optimum phase difference from said fifth driving signal for said optical head to emit a pulse beam having an optimum intensity to record a signal to said magneto-optical recording medium, determined using the optimum phase difference between said first and second driving signals, said provisional optimum laser beam intensity and said provisional optimum equalizer circuit, and provides said seventh driving signal to said laser drive circuit, controls said servo circuit so as to record a signal in an order of a land of said magneto-optical recording medium, a first groove adjacent to said land, and a second groove adjacent to said land, or in the order of a groove of said magneto-optical recording medium, a first land adjacent to said groove, and a second land adjacent to said groove according to said fifth and seventh driving signals, after recording a signal to said land, said first groove, and said second groove, or to said groove, said first land and said second land according to said fifth and seventh driving signals, generates an eighth driving signal for said optical head to reproduce the signal recorded in said land or said groove with the intensity of the laser beam altered, and provides said eighth driving signal to said laser drive circuit, and determines an optimum laser beam intensity according to a magneto-optical signal reproduced by said optical head from said land or said groove according to said eighth driving signal.