Magneto-optical recording method and apparatus to be used in the method
AssigneeFujitsu Limited
InventorsAkihiro Itakura, Haruhiko Izumi
Life of this patent
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Abstract
The invention provides magneto-optical recording method and apparatus, in which a space area on a magneto-optical recording medium is irradiated with a beam in the form of a pulse train in which a bottom power and an assist power are alternately repeated, so as to rapidly change the temperature at the front edge of a recording mark, thereby preventing jitter from increasing.
Claims9
A magneto-optical recording method by which a recording mark corresponding to data to be recorded is formed on a magneto-optical recording medium, comprising the steps of:
- irradiating a recording mark area with a beam in the form of a pulse train in which a first pulse having a writing power P.sub.w1 and a second pulse having a writing power P.sub.w2 are alternatively repeated, wherein the first writing power P.sub.w1 is larger than the second power P.sub.w2, and
- irradiating a space area between two of the recording mark areas with a beam in the form of a pulse train in which a first pulse having a bottom power and a second pulse having an assist power stronger than the bottom power are alternately repeated.
A magneto-optical recording apparatus for recording data to be recorded on a magneto-optical recording medium by irradiating the magneto-optical recording medium with a beam in accordance with the data to be recorded, comprising:
- a light source for emitting the beam irradiating the magneto-optical recording medium;
- a plurality of current sources for supplying different constant currents to the light source;
- a light source driving unit for controlling the light source so as to emit the beam having different powers on the basis of the currents supplied by the current sources;
- wherein said light source driving unit irradiates a recording mark area with a first beam in the form of a pulse train in which a first pulse having a writing power P.sub.w1 and a second pulse having a writing power P.sub.w2 are alternately repeated, and the first writing power P.sub.w1 is larger than the second power P.sub.w2, and said light source irradiates a space area between two of the recording mark areas with a second beam in the form of a pulse train in which a first pulse having a bottom power and a second pulse having an assist power stronger than the bottom power are alternately repeated;
- a plurality of switching units respectively interposed between the light source driving unit and the current sources;
- and
- a control signal generator for outputting a signal corresponding to the data to be recorded to the switching units so as to turn on/off the switching units.
A magneto-optical recording method by which a recording mark corresponding to data to be recorded is formed on a magneto-optical recording medium, comprising the steps of:
- irradiating a recording mark area with a beam in the form of a pulse train in which a first writing power P.sub.w1 and a second writing power P.sub.w2 are alternately repeated, wherein the first writing power P.sub.w1 is larger than the second power P.sub.w2, and
- irradiating a space area between two of the recording mark areas with a beam in the form of a pulse train in which a bottom power and an assist power stronger than the bottom power are alternately repeated.
A magneto-optical recording apparatus for recording data to be recorded on a magneto-optical recording medium by irradiating the magneto-optical recording medium with a beam in accordance with the data to be recorded, comprising:
- a light source for emitting the beam irradiating the magneto-optical recording medium;
- a plurality of current sources for supplying different constant currents to the light source;
- a light source driving unit for controlling the light source so as to emit the beam having different powers on the basis of the currents supplied by the current sources;
- wherein said light source driving unit irradiates a recording mark area with a first beam in the form of a pulse train in which a first writing power P.sub.w1 and a second writing power P.sub.w2 are alternately repeated, and the first writing power P.sub.w1 is larger than the second writing power P.sub.w2, and said light source irradiates a space area between two of the recording mark areas with a second beam in the form of a pulse train in which a bottom power and an assist power stronger than the bottom power are alternately repeated;
- a plurality of switching units respectively interposed between the light source driving unit and the current sources;
- and
- a control signal generator for outputting a signal corresponding to the data to be recorded to the switching units so as to turn on/off the switching units.
Dependencies are inferred from the claim text.