Method of and apparatus for recording information
AssigneeHitachi, Ltd.
InventorsHidehiko Kando, Hiroyuki Minemura
Life of this patent
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Abstract
A method of recording information in which each recording mark is formed in a recording medium, by irradiating a pulse chain of an energy beam including a first pulse, a middle pulse chain, a last pulse and a negative pulse following the last pulse. The adjusting average power of the first middle, last and negative pulses to designated power levels of the first, middle, last and negative pulses recorded in a control data zone.
Claims6
A method of recording information in which each recording mark is formed in a recording medium by irradiating a pulse chain of an energy beam including a first pulse, a middle pulse chain, a last pulse and a negative pulse following the last pulse, comprising the steps:
- adjusting average power of the first pulse to a designated power level of the first pulse recorded in a control data zone;
- adjusting average power of the middle pulse chain to an arithmetic mean of a designated upper power level and a designated lower power level recorded in the control data zone;
- adjusting average power of the last pulse to a designated power level of the last pulse recorded in the control data zone;
- adjusting average power of the negative pulse to a designated power level of the negative pulse recorded in the control data zone;
- and
- controlling an edge of the first pulse based on a look-up table which records values determined by combinations of a length of a mark and a length of a space leading the mark;
- wherein the average power is determined as the energy contained in a respective pulse divided by the pulse holding time.
Dependencies are inferred from the claim text.