Patent ID: 7961580
Filing Date: 2011-06-14
Classification: G11B

Abstract:
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 steps of: recording information on the optical disk with the multi-pulse chain in accordance with setting-values; and changing a position and a width of a first pulse in the multi-pulse chain on the basis of a first table and a second table, wherein: the setting-values concerning the multi-pulse chain for a predetermined recording velocity are expressed as a product of coefficients and a reference clock divided by a predetermined integer, the coefficients being expressed as integers; the first table is designed to specify the position of the first pulse and has integers for specifying coefficients of a smallest mark and a mark larger than the smallest mark, the coefficients of the smallest mark are defined based on a preceding space length and a succeeding space length, and the coefficients of the mark larger than the smallest mark are defined based on a recording mark length and a preceding space length; and the second table is designed to specify the width of the first pulse and has integers for specifying coefficients of a smallest mark and a mark larger than the smallest mark, the coefficients of the smallest mark are defined based on a preceding space length and a succeeding space length, and the coefficients of the mark larger than the smallest mark are defined based on a recording mark length and a preceding space length.