Information recording medium, information recording method, and information recording apparatus

An information recording method for recording information on an information recording medium, wherein

• the information recording medium has a plurality of pits which are formed periodically, and information is recorded on the information recording medium by irradiating a laser beam onto a pit string constituted by the plurality of pits and changing the shape of the pits,
• the pit string is periodically wobbled,
• a length of a period of the pits is a diffraction limit of the laser beam or less, and
• the period of the pit string is n times (n is 2 or greater integer) of the period of the pits, the information recording method comprising:
• a wobble detection step of detecting a wobble signal from the information recording medium;
• a clock generation step of generating a recording clock from the wobble signal detected in the wobble detection step;
• and
• a setting step of setting a recording unit time for recording the information to an integral multiple of the recording clock generated in the clock generation step.

An information recording apparatus for recording information on an information recording medium, wherein

• the information recording medium has a plurality of pits which are formed periodically, and information is recorded on the information recording medium by irradiating a laser beam onto a pit string constituted by the plurality of pits and changing the shape of the pits,
• the pit string is periodically wobbled,
• a length of a period of the pits is a diffraction limit of the laser beam or less, and
• the period of the pit string is n times (n is 2 or greater integer) of the period of the pits, the information recording apparatus comprising:
• a wobble detection unit that detects a wobble signal from the information recording medium;
• a clock generation unit that generates a recording clock from the wobble signal detected by the wobble detection unit;
• and
• a setting unit that sets a recording unit time for recording the information to an integral multiple of the recording clock generated by the clock generation unit.