Patent ID: 7313070
Filing Date: 2007-12-25
Classification: G11B,Y10T

Abstract:
1. A recording method for a rewritable optical recording medium, which comprises: recording information on a rewritable optical recording medium by a plurality of record mark lengths and space lengths between record marks based on EFM or EFM+ modulations or (1,7) runlength limited (RLL) non-return-to-zero inverted (NRZI) modulation system, wherein: between record marks, a laser beam having an erasing power Pe capable of crystallizing an amorphous phase is irradiated to form spaces between record marks, and when the time length of one record mark is represented by nT (where T is the reference clock period), for a record mark of n=2m (where m is an integer of at least 1), of which the time length (n−j)T (where j is a real number from −2.0 to 2.0) is divided into m sections of α when m≧3, for a record mark of n=2m, when the start time for nT mark is represented by T (ii) within i=2 to m, β i−1 T and α i T are alternately generated in this order, while β i−1 +α i is between 1.8 and 2.2 (provided that at i=2 and/or i=m, β i−1 +α i may be deviated from about 2 within a range of ±0.5, and when m≧4, β i−1 and α i take constant values βc and αc, respectively, within i=3 to m−1), and then, (iii) β m T is generated, and for a record mark of n=2m+1, when the start time for nT mark is represented by T (i) after a delay time T d1 ′T from T 0 , α 1 ′T is generated, then, (ii) within i=2 to m, β i−1 ′T and α i ′T are alternately generated in this order, while β i−1 ′+α i ′ is between 1.8 and 2.2 (provided that at i=2 and/or i=m, β i−1 ′+α i ′ may be deviated from about 2 within a range of ±2, and when m≧4, β i−1 ′ and α i ′ take constant values βc and αc, respectively, within i=3 to m−1), and then, (iii) β m ′T is generated, and with the same m, for a record mark of n=2m and a record mark of n=2m+1, T