| 摘要 |
<P>PROBLEM TO BE SOLVED: To regulate an easy-to-design strategy capable of improving the consistency of mark shapes particularly when n of nT is an odd number as for a recording system for forming a recording mark with a multi-pulse sequence which is increased by one pulse with an irradiation power Pw for every increase of 2T in a temporal length nT. <P>SOLUTION: When n is an odd number and n≥7, a period from the fall of a first pulse to the fall of a second pulse is set to be 2.5 T, and a period corresponding to a last pulse is set to be (2+δ<SB>1</SB>o)T where the value of δ<SB>1</SB>o is optimized within a range of 0<δ<SB>1</SB>o≤1. In this way, the multi-pulse sequence can be adjusted from the front pulse side and the rear pulse side so that an overall consistency can be realized in the mark shape upon recording the mark. At the same time, when n≥4, the fall of the first pulse is synchronized with a basic clock, and the fall of the second pulse and the rest of the pulses except for the last pulse are also synchronized with the basic clock by irradiating the pulses at periods of 2.5T or 2T. In this way, the design of a recording strategy generation circuit that generates the actual recording strategy can be simplified. <P>COPYRIGHT: (C)2004,JPO |
