Patent ID: 6411579
Filing Date: 2002-06-25
Classification: G11B

Abstract:
An optical recording method for recording mark length-modulated information with a plurality of recording mark lengths by irradiating a recording medium with a light, the optical recording method comprising the steps of:when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), dividing the time length of the recording mark nT into &eegr;1T, &agr;1T, &bgr;1T, &agr;2T, &bgr;2T, . . . , &agr;1T, &bgr;1T, . . . , &agr;mT, &bgr;mT, &eegr;2T in that order (m is a pulse division number; &Sgr;i(&agr;i+&bgr;i)+&eegr;1+&eegr;2=n; &agr;i (1&lE;i&lE;m) is a real number larger than 0; &bgr;i (1&lE;i&lE;mâˆ’1) is a real number larger than 0; &bgr;m is a real number larger than or equal to 0; and &eegr;1 and &eegr;2 are real numbers between âˆ’2 and 2); radiating recording light with a recording power Pwi in a time duration of &agr;iT (1&lE;i&lE;m); and radiating recording light with a bias power Pbi in a time duration of &bgr;iT (1&lE;i&lE;mâˆ’1), the bias power being Pbii and Pbii+1; wherein the pulse division number m is 2 or more for the time duration of at least one recording mark and meets n/m&gE;1.25 for the time length of all the recording marks.