Recording/reproducing apparatus and method that can record/reproduce a signal properly, and to correct phase difference between control/driving signals to appropriate laser of magnetic drive circuit

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 signal,
• 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 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,
• 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,
• 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 said groove, said first land and said second land according to said fifth and seventh driving signals,
• generates a ninth driving signal for said optical head to emit a laser beam of an optimum intensity to reproduce a signal recorded at said land or said groove, and provides said ninth driving signal to said laser drive circuit,
• determines an optimum equalizer coefficient to remove waveform interference according to a magneto-optical signal removed of waveform interference with the equalizer coefficient of said equalizer altered corresponding to a magneto-optical signal reproduced from said recorded signal at said land or said groove by said optical head according to said ninth driving signal, and
• setting the equalizer coefficient of said equalizer to the optimum equalizer coefficient.

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 of said magneto-optical recording medium, said first groove adjacent to said land and said second groove adjacent to said land, or to said groove of said magneto-optical recording-medium, said first land adjacent to said groove and said second land adjacent to said groove according to said fifth and seventh driving signals,
• generates an eighth driving signal by a laser beam whose intensity is altered and determining a provisional optimum laser beam intensity according to the reproduced magneto-optical signal,
• generates a ninth driving signal for said optical head to emit a laser beam of an optimum intensity to reproduce a signal recorded at said land or said groove, and provides said ninth driving signal to said laser drive circuit,
• sets the equalizer coefficient of said equalizer to the optimum equalizer coefficient determined from a magneto-optical signal which is a reproduction by said optical head according to said ninth driving signal of said signal recorded at said land or said groove,
• generates a tenth driving signal having a phase identical to the phase of said fifth driving signal for said magnetic head to generate a magnetic field modulated by a record signal to be altered in intensity, and provides said tenth driving signal to said magnetic head drive circuit,
• determines an optimum magnetic field intensity to record a signal from a magneto-optical signal corresponding to the signal recorded said magneto-optical recording medium according to said seventh and tenth driving signals reproduced by said optical head according to said ninth driving signal.

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 coefficient, 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 of said magneto-optical recording medium, said first groove adjacent to said land and said second groove adjacent to said land, or to said groove of said magneto-optical recording medium, said first land adjacent to said groove and said second land adjacent to said groove according to said fifth and seventh driving signals,
• generates an eighth driving signal by a laser beam whose intensity is altered and determining a provisional optimum laser beam intensity according to the reproduced magneto-optical signal,
• generates a ninth driving signal for said optical head to emit a laser beam of an optimum intensity to reproduce a signal recorded at said land or said groove, and provides said ninth driving signal to said laser chive circuit,
• sets the equalizer coefficient of said equalizer to the optimum equalizer coefficient determined from a magneto-optical signal which is a reproduction by said optical head according to said ninth driving signal of said signal recorded at said land or said groove,
• generates a tenth driving signal having a phase identical to the phase of said fifth driving signal for said magnetic head to generate a magnetic field modulated by a record signal to be altered in intensity, and provides said tenth driving signal to said magnetic head drive circuit,
• determines an optimum magnetic field intensity to record a signal from a magneto-optical signal corresponding to a signal recorded at said magneto-optical recording medium according to said seventh and tenth driving signals reproduced by said optical head according to said ninth driving signal, and generates an eleventh driving signal having the determined intensity, and a phase identical to the phase of said fifth driving signal,
• recording and/or reproducing a signal to and/or from said magneto-optical recording medium according to said optimum phase difference, said optimum equalizer coefficient, said seventh driving signal, said ninth driving signal and said eleventh driving signals.

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 said laser beam using 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 coefficient, 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 of said magneto-optical recording medium, said first groove adjacent to said land and said second groove adjacent to said land, or to said groove of said magneto-optical recording medium, said first land adjacent to said groove and said second land adjacent to said groove according to said fifth and seventh driving signals,
• generates an eighth driving signal by a laser beam whose intensity is altered and determining a provisional optimum laser beam intensity according to the reproduced magneto-optical signal,
• generates a ninth chiming signal for said optical head to emit a laser beam of an optimum intensity to reproduce a signal recorded at said land or said groove, and provides said ninth driving signal to said laser chive circuit,
• sets the equalizer coefficient of said equalizer to the optimum equalizer coefficient determined from a magneto-optical signal which is a reproduction by said optical head according to said ninth driving signal of said signal recorded at said land or said groove,
• generates a tenth driving signal having a phase identical to the phase of said fifth driving signal for said magnetic head to generate a magnetic field modulated by a record signal to be altered in intensity, and provides said tenth driving signal to said magnetic head drive circuit,
• determines an optimum magnetic field intensity to record a signal from a magneto-optical signal corresponding to a signal recorded at said magneto-optical recording medium according to said seventh and tenth driving signals reproduced by said optical head according to said ninth driving signal, and generates an eleventh driving signal having the determined intensity, and a phase identical to the phase of said fifth driving signal,
• following determination of said optimum phase difference and said optimum equalizer coefficient, and generation of said seventh driving signal, said ninth driving signals and said eleventh driving signal for said land or said groove,
• determines a provisional optimum laser beam intensity for a groove or a land, determines a pulse beam having the optimum intensity and a laser beam having the optimum intensity based on the determined provisional optimum laser beam intensity, and generates a twelfth driving signal to generate a pulse beam having the optimum intensity and a thirteenth driving signal to generate a laser beam having the optimum intensity,
• recording and/or reproducing a signal to and/or from said magneto-optical recording medium according to said optimum phase difference, said optimum equalizer coefficient, said seventh driving signal, said ninth driving signal, said eleventh driving signal, said twelfth driving signal and said thirteenth driving signal.

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 diving 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 of 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 chive 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 predetermined 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 diving 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 coefficient, 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 of said magneto-optical recording medium, said first groove adjacent to said land and said second groove adjacent to said land, or to said groove of said magneto-optical recording medium, said first land adjacent to said groove and said second land adjacent to said groove according to said fifth and seventh driving signals,
• generates an eighth driving signal by a laser beam whose intensity is altered and determining a provisional optimum laser beam intensity according to the reproduced magneto-optical signal,
• generates a ninth driving signal for said optical head to emit a laser beam of an optimum intensity to reproduce a signal recorded at said land or said groove, and provides said ninth driving signal to said laser dive circuit,
• sets the equalizer coefficient of said equalizer to the optimum equalizer coefficient determined from a magneto-optical signal which is a reproduction by said optical head according to said ninth driving signal of said signal recorded at said land or said groove,
• generates a tenth driving signal having a phase identical to the phase of said fifth driving signal for said magnetic head to generate a magnetic field modulated by a record signal to be altered in intensity, and provides said tenth driving signal to said magnetic head drive circuit,
• determines an optimum magnetic field intensity to record a signal from a magneto-optical signal corresponding to a signal recorded at said magneto-optical recording medium according to said seventh and tenth driving signals reproduced by said optical head according to said ninth driving signal, and generates an eleventh driving signal having the determined intensity, and a phase identical to the phase of said fifth driving signal,
• following determination of said optimum phase difference and said optimum equalizer coefficient, and generation of said seventh driving signal, said ninth driving signals and said eleventh driving signal for said land or said groove,
• determines a provisional optimum laser beam intensity for a groove or a land, determines a pulse beam having the optimum intensity and a laser beam having the optimum intensity based on the determined provisional optimum laser beam intensity, and generates a twelfth driving signal to generate a pulse beam having the optimum intensity and a thirteenth driving signal to generate a laser beam having the optimum intensity,
• recording and/or reproducing a signal to and/or from said magneto-optical recording medium according to said optimum phase difference, said optimum equalizer coefficient, said seventh driving signal, a fourteenth driving signal of a phase identical to the phases of said ninth and twelfth driving signals, and having an amplitude of the average of the amplitudes of said ninth driving signal and said twelfth driving signal, and a fifteenth driving signal of a phase identical to the phases of said eleventh and thirteenth driving signals, and having an amplitude of the average of the amplitudes of said eleventh and thirteenth driving signals.

A recording/reproduction method of recording and/or reproducing a signal to and/or from a magneto-optical recording medium, comprising:

• a first step of determining an optimum phase difference between a pulse beam and a magnetic field to record a signal to said magneto-optical recording medium,
• a second step of recording a signal to said magneto-optical recording medium using the optimum phase difference determined at said first step, reproducing the recorded signal by a laser beam with altered intensity, and determining a provisional optimum laser beam intensity according to a reproduced magneto-optical signal,
• a third step of recording a signal to said magneto-optical recording medium using the optimum phase difference determined at said first step, and determining a provisional optimum equalizer coefficient of an equalizer removing waveform interference of a magneto-optical signal corresponding to the recorded signal reproduced using the provisional optimum laser beam intensity determined at said second step,
• a fourth step of recording 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 using the optimum phase difference determined at said first step with the intensity of the pulse beam altered, and determining an optimum pulse beam intensity to record a signal according to a magneto-optical signal corresponding to reproduction of the signal recorded at said land using the provisional optimum laser beam intensity determined at said second step and the provisional optimum equalizer coefficient determined at said third step,
• a fifth step of recording a signal in an order of said land, said first groove and said second groove using the pulse beam having the optimum intensity determined at said fourth step and the magnetic field having the optimum phase difference from said pulse beam determined at said first step and a maximum intensity modulated by a recording signal, reproducing said signal recorded in said land with the intensity of the laser beam altered, and determining an optimum laser beam intensity to reproduce a signal according to a magneto-optical signal removed of waveform interference corresponding to the reproduced magneto-optical signal using the provisional optimum equalizer coefficient determined at said third step,
• a sixth step of recording a signal in an order of said land, said first groove and said second groove using a pulse beam having the optimum intensity determined at said fourth step and a magnetic field having the optimum phase difference from said pulse beam determined at said first step, and a maximum intensity modulated by the recording signal, reproducing said signal recorded in said land using a laser beam of the optimum intensity determined at said fifth step, and determining an optimum equalizer coefficient according to a magneto-optical signal removed of waveform interference with the equalizer coefficient altered corresponding to the reproduced magneto-optical signal, and
• a seventh step of recording a signal in an order of said land, said first groove and said second groove using a pulse beam having the optimum intensity determined at said fourth step and a magnetic field having the optimum phase difference from said pulse beam determined at said first step and an intensity modulated by a record signal to be altered, reproducing said signal recorded in said land using a laser beam of the optimum intensity determined at said fifth step, and determining an optimum magnetic field intensity according to a magneto-optical signal removed of waveform interference corresponding to the reproduced magneto-optical signal using an optimum equalizer coefficient determined at said sixth step,
• recording and/or reproducing a signal to and/or from said magneto-optical recording medium according to the phase difference determined at said first step, the optimum pulse beam intensity determined at said fourth step, the optimum laser beam intensity determined at said fifth step, the optimum equalizer coefficient determined at said sixth step, and the optimum magnetic field intensity determined at said seventh step.

A recording/reproduction method of recording and/or reproducing a signal to and/or from a magneto-optical recording medium, comprising:

• a land condition determination step determining condition in recording and/or reproducing a signal to and/or from a land of said magneto-optical recording medium, and
• a groove condition determination step of determining condition in recording and/or reproducing a signal to and/or from a groove of said magneto-optical recording medium,
• wherein said land condition determination step comprises:
• a first step of determining an optimum phase difference between a pulse beam and a magnetic field to record a signal to said magneto optical recording medium,
• a second step of recording a signal to said magneto-optical recording medium using the optimum phase difference determined at said first step, reproducing the recorded signal by a laser beam with altered intensity, and determining a provisional optimum laser beam intensity according to a reproduced magneto-optical signal,
• a third step of recording a signal to said land of said magneto-optical recording medium using the optimum phase difference determined at said first step, and determining a provisional optimum equalizer coefficient of an equalizer removing waveform interference of a magneto-optical signal corresponding to the recorded signal reproduced using the provisional optimum laser beam intensity determined at said second step,
• a fourth step of recording 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 using the optimum phase difference determined at said first step with the intensity of the pulse beam altered, and determining an optimum pulse beam intensity to record a signal according to a magneto-optical signal corresponding to reproduction of the signal recorded at said land using the provisional optimum laser beam intensity determined at said second step and the provisional optimum equalizer coefficient determined at said third step,
• a fifth step of recording a signal in an order of said land, said first groove and said second groove using the pulse beam having the optimum intensity determined at said fourth step and the magnetic field having the optimum phase difference from said pulse beam determined at said first step and a maximum intensity modulated by a recording signal, reproducing said signal recorded in said land with the intensity of the laser beam altered, and determining an optimum laser beam intensity to reproduce a signal according to a magneto-optical signal removed of waveform interference corresponding to the reproduced magneto-optical signal using the provisional optimum equalizer coefficient determined at said third step,
• a sixth step of recording a signal in an order of said land, said first groove and said second groove using a pulse beam having the optimum intensity determined at said fourth step and a magnetic field having the optimum phase difference determined at said first step from said pulse beam, and a maximum intensity modulated by the recording signal, reproducing said signal recorded in said land using a laser beam of the optimum intensity determined at said fifth step, and determining an optimum equalizer coefficient according to a magneto-optical signal whose waveform interference was removed with the equalizer coefficient altered corresponding to the reproduced magneto-optical signal, and
• a seventh step of recording a signal in an order of said land, said first groove and said second groove using a pulse beam having the optimum intensity determined at said fourth step and a magnetic field having the optimum phase difference determined at said first step from said pulse beam and an intensity modulated by a record signal to be altered, reproducing said signal recorded in said land using a laser beam of the optimum intensity determined at said fifth step, and determining an optimum magnetic field intensity according to a reproduced magneto-optical signal whose waveform interference was removed using an optimum equalizer coefficient determined at said sixth step,
• wherein said groove condition determination step comprises:
• an eighth step of recording a signal at a groove of said magneto-optical recording medium using the optimum phase difference determined at said first step, reproducing the recorded signal by a laser beam whose intensity is altered, and determining a provisional optimum laser beam intensity according to the reproduced magneto-optical signal,
• a ninth step of sequentially recording a signal at said magneto-optical recording medium in an order of a groove, a first land adjacent to said groove, and a second land adjacent to said groove using the optimum phase difference determined at said first step with the intensity of the pulse beam altered, and determining the optimum pulse beam intensity to record a signal according to a magneto-optical signal reproduced corresponding to the signal recorded at said groove using the provisional optimum laser beam intensity determined at said eighth step and the optimum equalizer coefficient determined at said sixth step, and
• a tenth step recording a signal in the order of said groove, said first land and said second land using the pulse beam having the optimum intensity determined at said ninth step and the magnetic field having the optimum phase difference from said pulse beam determined at said first step, and the maximum intensity modulated by a recording signal, reproducing the signal recorded at said groove with the intensity of the laser beam altered, and determining the optimum laser beam intensity to reproduce a signal according to a reproduced magneto-optical signal whose waveform interference was removed using the optimum equalizer coefficient determined at said sixth step,
• wherein a signal is recorded and/or reproduced to and/or from said magneto-optical recording medium using the phase difference determined at said first step, the optimum pulse beam intensity determined at said fourth step, the optimum laser beam intensity determined at said fifth step, the optimum equalizer coefficient determined at said sixth step, the optimum magnetic field intensity determined at said seventh step, the optimum pulse beam intensity determined at said ninth step, and the optimum laser beam intensity determined at said tenth step.

A recording/reproduction method of recording and/or reproducing a signal to and/or from a magneto-optical recording medium, comprising:

• a land condition determination step determining conditions in recording and/or reproducing a signal to and/or from a land of said magneto-optical recording medium, and
• a groove condition determination step of determining conditions in recording and/or reproducing a signal to and/or from a groove of said magneto-optical recording medium,
• wherein said land condition determination step comprises:
• a first step of determining an optimum phase difference between a pulse beam and a magnetic field to record a signal to said magneto optical recording medium,
• a second step of recording a signal to said magneto-optical recording medium using the optimum phase difference determined at said first step, reproducing the recorded signal by a laser beam with altered intensity, and
• determining a provisional optimum laser beam intensity according to a reproduced magneto-optical signal,
• a third step of recording a signal to a land of said magneto-optical recording medium using the optimum phase difference determined at said first step, and determining a provisional optimum equalizer coefficient of an equalizer removing waveform interference of a magneto-optical signal corresponding to the recorded signal reproduced using the provisional optimum laser beam intensity determined at said second step,
• a fourth step of recording 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 using the optimum phase difference determined at said first step with the intensity of the pulse beam altered, and determining an optimum pulse beam intensity to record a signal according to a magneto-optical signal corresponding to reproduction of the signal recorded at said land using the provisional optimum laser beam intensity determined at said second step and the provisional optimum equalizer coefficient determined at said third step,
• a fifth step of recording a signal in an order of said land, said first groove and said second groove using the pulse beam having the optimum intensity determined at said fourth step and the magnetic field having the optimum phase difference from said pulse beam determined at said first step and a maximum intensity modulated by a recording signal, reproducing said signal recorded in said land with the intensity of the laser beam altered, and determining an optimum laser beam intensity to reproduce a signal according to a reproduced magneto-optical signal whose waveform interference was removed using the provisional optimum equalizer coefficient determined at said third step,
• a sixth step of recording a signal in an order of said land, said first groove and said second groove using a pulse beam having the optimum intensity determined at said fourth step and a magnetic field having the optimum phase difference determined at said first step from said pulse beam, and a maximum intensity modulated by the recording signal, reproducing said signal recorded in said land using a laser beam of the optimum intensity determined at said fifth step, and determining an optimum equalizer coefficient according to a reproduced magneto-optical signal whose waveform interference was removed with the equalizer coefficient altered, and
• a seventh step of recording a signal in an order of said land, said first groove and said second groove using a pulse beam having the optimum intensity determined at said fourth step and a magnetic field having the optimum phase difference determined at said first step from said pulse beam and an intensity modulated by a record signal to be altered, reproducing said signal recorded in said land using a laser beam of the optimum intensity determined at said fifth step, and determining an optimum magnetic field intensity according to a reproduced magneto-optical signal whose waveform interference was removed using an optimum equalizer coefficient determined at said sixth step,
• wherein said groove condition determination step comprises:
• an eighth step of recording a signal at a groove of said magneto-optical recording medium using the optimum phase difference determined at said first step, reproducing the recorded signal by a laser beam whose intensity is altered, and determining a provisional optimum laser beam intensity according to the reproduced optical signal,
• a ninth step of sequentially recording a signal on said magneto-optical recording medium in an order of a groove, a first land adjacent to said groove, and a second land adjacent to said groove using the optimum phase difference determined at said first step with the intensity of the pulse beam altered, and determining the optimum pulse beam intensity to record a signal according to a magneto-optical signal reproduced corresponding to the signal recorded at said groove using the provisional optimum laser beam intensity determined at said eighth step and the optimum equalizer coefficient determined at said sixth step, and
• a tenth step recording a signal in the order of said groove, said first land and said second land using the pulse beam having the optimum intensity determined at said ninth step and the magnetic field having the optimum phase difference from said pulse beam determined at said first step,
• and the maximum intensity modulated by a recording signal, reproducing the signal recorded at said groove with the intensity of the laser beam altered, and determining the optimum laser beam intensity to reproduce a signal according to a magneto-optical signal removed of waveform interference corresponding to the reproduced magneto-optical signal using the optimum equalizer coefficient determined at said sixth step,
• wherein a signal is recorded and/or reproduced to and/or from said magneto-optical recording medium using the phase difference determined at said first step, the optimum laser beam intensity determined at said fifth step, the optimum equalizer coefficient determined at said sixth step, the optimum magnetic field intensity determined at said seventh step, the average of the optimum pulse beam intensity determined at said fourth step and the optimum pulse beam intensity determined at said ninth step, and the optimum laser beam intensity determined at said tenth step.