| US 7,492,688 B2 | ||
| Highly adaptive recording method and optical recording apparatus | ||
| Shinji Fujita, Yokohama (Japan); Takeshi Maeda, Koganei (Japan); Manabu Shiozawa, Yokohama (Japan); and Takahiro Kurokawa, Fujisawa (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on Jul. 31, 2008, as Appl. No. 12/183,946. | ||
| Application 12/183946 is a continuation of application No. 10/919489, filed on Aug. 17, 2004. | ||
| Claims priority of application No. 2003-322426 (JP), filed on Sep. 16, 2003. | ||
| Prior Publication US 2009/0010132 A1, Jan. 08, 2009 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G11B 5/09 (2006.01) | ||
| U.S. Cl. 369—59.11 [369/59.12] | 3 Claims |
| 1. An optical disk recording method used for an optical disk having a recording film capable of being changed to an optically
different state by irradiation with an energy beam to thereby record information, said method being provided for recording
information as a recording mark length and preceding and following space lengths in said optically different state by irradiating
said recording film with a multi-pulse chain of said energy beam having at least two emission power levels each having an
emission time changed in accordance with said optical disk while there is relative movement between said energy beam and a
surface of said recording film of said optical disk, the method comprising the steps of:
recording information on the optical disk with the multi-pulse chain using setting-values; and
changing a position and a width of a first pulse and a last pulse in the multi-pulse chain on the basis of a first table,
a second table and a third table; wherein:
the setting-values concerning the multi-pulse chain for predetermined recording velocity are expressed as a sum of a linear
term and a nonlinear term, and coefficients of the linear term and the nonlinear term are expressed as integers respectively,
the first table has coefficients of the linear term for the predetermined recording velocity and is designed to specify the
position of the first pulse, and the coefficients in the first table are defined based on recording mark length and preceding
space length,
the second table has coefficients of the linear term and the nonlinear term for the predetermined recording velocity and is
designed to specify the width of the first pulse, and the coefficients in the second table are defined based on recording
mark length and preceding space length, and
the third table has coefficients of the linear term and the nonlinear term for the predetermined recording velocity and is
designed to specify the width of the last pulse, and the coefficients in the third table are defined based on recording mark
length.
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