| US 7,486,605 B2 | ||
| Recording method and media having marks and spaces with lengths defined by a predetermined modulation method | ||
| Mamoru Shoji, Sakai (Japan); Kenji Koishi, Sanda (Japan); Atsushi Nakamura, Moriguchi (Japan); Takashi Ishida, Yawata (Japan); and Shuichi Tasaka, Takarazuka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Aug. 24, 2006, as Appl. No. 11/467,130. | ||
| Application 11/467130 is a division of application No. 10/501500, granted, now 7,272,095, previously published as PCT/JP03/13011, filed on Oct. 09, 2003. | ||
| Claims priority of application No. 2002-297295 (JP), filed on Oct. 10, 2002; and application No. 2002-312432 (JP), filed on Oct. 28, 2002. | ||
| Prior Publication US 2006/0285477 A1, Dec. 21, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G11B 7/0045 (2006.01) | ||
| U.S. Cl. 369—59.12 | 3 Claims |
| 1. A recording method comprising the steps of:
modulating data to be recorded, to generate a plurality of recording modulation codes; and
emitting a pulsed light beam to a data storage medium, so that a plurality of recording marks and spaces are recorded on the
data storage medium, the lengths of the recording marks and spaces being defined by the modulated data, wherein
at least two of the plurality of the recording marks comprise:
a first pulse which is disposed at a front and forms a leading edge of the recording mark;
a last pulse which is disposed at a backend and forms a trailing edge of the recording mark; and
a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark,
the multi-pulse train has a pulse period longer than T, T representing a reference period of the recording modulation code,
the number of pulses in each of the recording marks is increased by one as the recording mark is increased in length by 2T,
the plurality of recording marks have different lengths differing by T or multiples thereof from one another,
the shortest recording mark and the second shortest recording mark are each constituted by a single pulse, and
the third shortest recording mark and the fourth shortest recording mark are each constituted by two pulses,
wherein a last pulse rising timing of an nth (n is an odd number which is three or greater) shortest recording mark and a last pulse rising timing of an (n+1)th shortest recording mark are different from each other by 0.5T, and a last pulse rising timing of an (n+1)th shortest recording mark and a last pulse rising timing of an (n+2)th shortest recording mark are different from each other by 1.5T.
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