Optical information recording method, optical information recording device, optical information reproduction method, optical information reproduction device, and optical information recording medium

An optical information recording device in which marks are formed by irradiation with a laser beam corresponding to a recording pulse sequence modulated between a plurality of power levels and information is recorded based on edge positions of the marks and spaces between the marks, on an optical information recording medium provided with N (N is an integer equal to or greater than 2) information layers each having a recording layer in which variations in a physical state are caused by local temperature variations caused by convergence of a laser beam, the optical information recording device comprising:

• a selection unit that selects control parameters of the recording pulse sequence for forming the marks on the basis of combinations of a mark length of the mark, a first space length of a first space immediately before the mark, and a second space length of a second space immediately after the mark;
• and
• a recording unit that records the marks by the recording pulse sequence determined by the selected control parameters, wherein
• the selection unit classifies the first space length into m types (m is an integer) and classifies the second space length into n types (n is an integer), at least either of the m and the n being equal to or greater than 2;
• the control parameters include (m×n) control parameters each corresponding to a combination of the first space length and the second space length;
• and
• an absolute value of a difference between two predetermined control parameters from among the (m×n) control parameters selected during recording on a second information layer located on an incidence side of the laser beam with respect to a predetermined first information layer from among the N information layers is equal to or greater than an absolute value of a difference between two predetermined control parameters from among the (m×n) control parameters selected during recording on the first information layer.

An optical information recording medium on which marks are formed by irradiation with a laser beam corresponding to a recording pulse sequence modulated between a plurality of power levels and information is recorded based on edge positions of the marks and spaces between the marks, the optical information recording medium comprising:

• N (N is an integer equal to or greater than 2) information layers each having a recording layer in which variations in a physical state are caused by local temperature variations caused by convergence of a laser beam, wherein
• control parameters of the recording pulse sequence for forming the marks are selected on the basis of combinations of a mark length of the mark, a first space length of a first space immediately before the mark, and a second space length of a second space immediately after the mark;
• the marks are recorded by the recording pulse sequence determined by the selected control parameters;
• when control parameters of the recording pulse sequence are selected, the first space length is classified into m types (m is an integer), and the second space length is classified into n types (n is an integer), at least either of the m and the n being equal to or greater than 2;
• the control parameters include (m×n) control parameters each corresponding to a combination of the first space length and the second space length;
• and
• an absolute value of a difference between two predetermined control parameters from among the (m×n) control parameters selected during recording on a second information layer located on an incidence side of the laser beam with respect to a predetermined first information layer from among the N information layers is equal to or greater than an absolute value of a difference between two predetermined control parameters from among the (m×n) control parameters selected during recording on the first information layer.