Information recording method and optical disk apparatus using same

A method for storing data on an optical disk comprising the steps of:

• (a) rotating a disk recording medium having track formed by connecting numerous sectors, each comprised of a preformatted area, in which at least addresses are previously recorded, and a data area;
• (b) converting write information for every record unit corresponding to a sector into coded data according to a format previously determined,
• said coded data consisting of a series of run length limited codes, into which said write information is converted according to a predetermined coding rule, a synchronizing signal for synchronizing a reproduced clock added at the beginning of said write information, and a synchronizing signal for resynchronization inserted into said write information inserted for every specified data length,
• said resynchronizing signal being selected between at least one sort of first resynchronizing code patterns, in which the number of symbols "1" included therein is even, and at least one sort of second resynchronizing code patterns, in which said number of symbols "1" is odd;
• each of said first and second resynchronizing code patterns including at least a specified code pattern, which does not meet said coding rule,
• either one selected between said first resynchronizing code pattern and said second resynchronizing code pattern so that an accumulated charge obtained from a run length of said coded data approaches zero being used for said resynchronizing signal;
• (c) obtaining record waveform data, in which a level is inserted at each symbol "1" in said coded data, from said coded data;
• and
• (d) forming record marks corresponding to record waveform data by irradiating said disk recording medium with a light beam intensity-modulated, depending on said record waveform data, utilizing local temperature rise of said disk recording medium by said light beam,
• wherein an average level of a reproduced signal by said record marks is approximately constant, independently from said write information.

An optical disk apparatus comprising:

• (a) means for rotating a disk recording medium having a track formed by connecting numerous sectors, each consisting of a preformatted area, in which at least addresses are previously recorded, and a data area;
• (b) coding means for converting write information for every record unit corresponding to a sector into coded data according to a format previously determined,
• said coded data consisting of a series of run length limited codes, into which said write information is converted according to a predetermined coding rule, a synchronizing signal for synchronizing a reproduced clock added at the beginning of said write information, and a synchronizing signal for resynchronization inserted into said write information for every specified data length,
• said resynchronizing signal being selected between at least one sort of first resynchronizing code patterns, in which the number of symbols "1" included therein is even, and at least one sort of second resynchronizing code patterns, in which said number of symbols "1" is odd;
• each of said first and second resynchronizing code patterns including at least a specified code pattern, which does not meet said coding rule,
• either one selected between said first resynchronizing code pattern and said second resynchronizing code pattern so that an accumulated charge obtained from a run length of said coded data approaches zero being used for said resynchronizing signal;
• (c) recording means for obtaining record waveform data, in which a level is inserted by each symbol "1" in said coded data, from said coded data and forming record marks corresponding to record waveform data by irradiating said disk recording medium with a light beam intensity-modulated, depending on said record waveform data, utilizing local temperature rise of said disk recording medium by said light beam.