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

An information recording method using a recording medium permitted to get into a first state by a first power level of an energy beam and permitted to get into a second state by a second power level of said energy beam higher than said first power level, for recording information on said recording medium by moving said energy beam and said recording medium relatively to each other so that said recording medium is irradiated with said energy beam and said first and second states are formed on said recording medium with predetermined lengths and at predetermined intervals, comprising the steps of:

• when a period of a recording timing generating clock in a recording mode is T, and a relative velocity of said energy beam and said recording medium is v,
• forming a sequence of said second state with length avT (first mark), said first state with length ivT (first space) following said first mark, said second state with length mvT (second mark) following said first space, said first state with length jvT (second space) following said second mark and said second state with length bvT (third mark) following said second space as a first small recording pattern;
• forming a sequence which starts with said first state and ends with said first state while said first and second states appear alternately by a finite number of times, as a second small recording pattern;
• forming a state in which said second small recording pattern follows said first small recording pattern, as a basic recording pattern;
• forming a state in which said basic recording patterns are repeated, as a recording pattern;
• forming said recording pattern which comprises said basic recording patterns obtained by changing a parameter j variously while parameters a, i and m are fixed, as a first recording pattern, said parameters a, i, m and j being natural numbers;
• forming said recording pattern which comprises said basic recording patterns obtained by changing said parameter i variously while a parameter b and said parameters j and m are fixed, as a second recording pattern, said parameter b being a natural number;
• using at least one of first and second edge position measuring methods;
• and
• using at least one of first and second timing adjusting methods, wherein
• said first edge position measuring method estimates a position of a boundary between said second mark and said first space by comparing a time interval from time corresponding to a mark edge position opposite to said first space of said first mark in a read signal of said first recording pattern to time corresponding to the position of the boundary between said second mark and said first space in said read signal with a time interval of (a+i)T;
• said second edge position measuring method estimates a position of a boundary between said second mark and said second space by comparing a time interval from time corresponding to the position of the boundary between said second mark and said second space in a read signal of said second recording pattern to time corresponding to a mark edge position opposite to said second space of said third mark in said read signal with a time interval of (b+i)T;
• said first timing adjusting method changes timing for making said energy beam reach said second power level in accordance with a combination of the respective lengths of said first and second states to be formed on said recording medium;
• and
• said second timing adjusting method changes timing for shifting said energy beam from said second power level to another energy level in accordance with a combination of the respective lengths of said second and first states to be formed on said recording medium.

An information recording method using a recording medium permitted to get into a first state by a first power level of an energy beam and permitted to get into a second state by a second power level of said energy beam higher than said first power level, for recording information on said recording medium by moving said energy beam and said recording medium relatively to each other so that said recording medium is irradiated with said energy beam and said first and second states are formed on said recording medium with predetermined lengths and at predetermined intervals, comprising the steps of:

• when a period of a recording timing generating clock in a recording mode is T, and a relative velocity of said energy beam and said recording medium is v,
• forming a sequence of said second state with length avT (first mark), said first state with length ivT (first space) following said first mark, said second state with length mvT (second mark) following said first space, said first state with length jvT (second space) following said second mark and said second state with length bvT (third mark) following said second space as a first small recording pattern;
• forming a sequence which starts with said first state and ends with said first state while said first and second states appear alternately by a finite number of times, as a second small recording pattern;
• forming a state in which said second small recording pattern follows said first small recording pattern, as a basic recording pattern;
• forming a state in which said basic recording patterns are repeated, as a recording pattern;
• forming said recording pattern which comprises said basic recording patterns obtained by changing a parameter j variously while parameters a, i and m are fixed, as a first recording pattern, said parameters a, i, m and j being natural numbers;
• forming said recording pattern which comprises said basic recording patterns obtained by changing said parameter i variously while a parameter b and said parameters j and m are fixed, as a second recording pattern, said parameter b being a natural number;
• using at least one of first and second edge position measuring methods;
• using at least one of first and second timing adjusting methods;
• and
• using at least one of first and second timing correcting methods, wherein
• said first edge position measuring method estimates a position of a boundary between said second mark and said first space by comparing a time interval from time corresponding to a mark edge position opposite to said first space of said first mark in a read signal of said first recording pattern to time corresponding to the position of the boundary between said second mark and said first space in said read signal with a time interval of (a+i)T;
• said second edge position measuring method estimates a position of a boundary between said second mark and said second space by comparing a time interval from time corresponding to the position of the boundary between said second mark and said second space in a read signal of said second recording pattern to time corresponding to a mark edge position opposite to said second space of said third mark in said read signal with a time interval of (b+i)T;
• said first timing adjusting method changes timing for making said energy beam reach said second power level in accordance with a combination of the respective lengths of said first and second states to be formed on said recording medium;
• said second timing adjusting method changes timing for shifting said energy beam from said second power level to another energy level in accordance with a combination of the respective lengths of said second and first states to be formed on said recording medium;
• said first timing correcting method adjusts the timing in said first timing adjusting method based on a result of said first edge position measuring method;
• and
• said second timing correcting method adjusts the timing in said second timing adjusting method based on a result of said second edge position measuring method.

An information recording method using a recording medium permitted to get into a first state by a first power level of an energy beam and permitted to get into a second state by a second power level of said energy beam higher than said first power level, for recording information on said recording medium by moving said energy beam and said recording medium relatively to each other so that said recording medium is irradiated with said energy beam and said first and second states are formed on said recording medium with predetermined lengths and at predetermined intervals, comprising the steps of:

• when a period of a recording timing generating clock in a recording mode is T, and a relative velocity of said energy beam and said recording medium is v,
• forming a sequence of said second state with length avT (first mark), said first state with length ivT (first space) following said first mark, said second state with length mvT (second mark) following said first space, said first state with length jvT (second space) following said second mark and said second state with length bvT (third mark) following said second space as a first small recording pattern;
• forming a sequence which starts with said first state and ends with said first state while said first and second states appear alternately by a finite number of times, as a second small recording pattern;
• forming a state in which said second small recording pattern follows said first small recording pattern, as a basic recording pattern;
• forming a state in which said basic recording patterns are repeated, as a recording pattern;
• forming said recording pattern which comprises said basic recording patterns obtained by changing a parameter j variously while parameters a, i and m are fixed, as a first recording pattern, said parameters a, i, m and i being natural numbers;
• forming said recording pattern which comprises said basic recording patterns obtained by changing said parameter i variously while a parameter b and said parameters j and m are fixed, as a second recording pattern, said parameter b being a natural number;
• using at least one of first and second edge position measuring methods;
• using at least one of first and second timing adjusting methods;
• and
• using at least one of first and second timing correcting methods, wherein
• said first edge position measuring method estimates a position of a boundary between said second mark and said first space by comparing a time interval from time corresponding to a mark edge position opposite to said first space of said first mark in a read signal of said first recording pattern to time corresponding to the position of the boundary between said second mark and said first space in said read signal with a time interval of (a+i)T;
• said second edge position measuring method estimates a position of a boundary between said second mark and said second space by comparing a time interval from time corresponding to the position of the boundary between said second mark and said second space in a read signal of said second recording pattern to time corresponding to a mark edge position opposite to said second space of said third mark in said read signal with a time interval of (b+i)T;
• said first timing adjusting method changes timing for making said energy beam reach said second power level in accordance with a combination of the respective lengths of said first and second states to be formed on said recording medium;
• said second timing adjusting method changes timing for shifting said energy beam from said second power level to another energy level in accordance with a combination of the respective lengths of said second and first states to be formed on said recording medium;
• said first timing correcting method operates so that
• in a case where said first edge position measuring method concludes that the time interval from the time corresponding to the mark edge position opposite to said first space of said first mark in the read signal of said first recording pattern to the time corresponding to the position of the boundary between said second mark and said first space in said read signal is loner than the time interval of (a+i)T, timing of arrival at said second power level for forming said second state with length mT is quickened only when said second state with length mT is to be formed so as to follow said first state with length iT by said first timing adjusting method;
• and
• in a case where said first edge position measuring method concludes that the time interval from the time corresponding to the mark edge position opposite to said first space of said first mark in the read signal of said first recording pattern to the time corresponding to the position of the boundary between said second mark and said first space in said read signal is shorter than the time interval of (a+i)T, the timing of arrival at said second power level for forming said second state with length mT is delayed only when said second state with length mT is to be formed so as to follow said first state with length iT by said first timing adjusting method, and
• said second timing correcting method operates so that
• in a case where said second edge position measuring method concludes that the time interval from the time corresponding to the position of the boundary between said second mark and said second space in the read signal of said second recording pattern to the time corresponding to the mark edge position opposite to said second space of said third mark in said read signal is loner than the time interval of (b+j)T, timing of shifting from said second power level to another energy level for forming said second state with length mT is delayed only when said first state with length jT is to be formed so as to follow said second state with length mT by said second timing adjusting method;
• and
• in a case where said second edge position measuring method concludes that the time interval from the time corresponding to the position of the boundary between said second mark and said second space in the read signal of said second recording pattern to the time corresponding to the mark edge position opposite to said second space of said third mark in said read signal is shorter than the time interval of (b+j)T, the timing of shifting from said second power level to another energy level for forming said second state with length mT is quickened only when said first state with length jT is to be formed so as to follow said second state with length mT by said second timing adjusting method.