Patent attributes
An optical memory device records and reproduces information by forming marks and lands in an optical information recording medium. The optical memory device includes: a first measuring part for measuring a length of each of the marks when information is recorded in the optical information recording medium using a reference write strategy and a write strategy in which widths of a specific mark and a powered pulse with respect to the reference write strategy are varied; a first measuring value memorizing part for memorizing a result of the first measuring part; a theory length memorizing part for memorizing theoretical lengths of the respective marks and lands; a first deviation value computing part for computing deviation value of each of the marks by changing the write strategy on the basis of the lengths of the marks memorized in the first measuring value memorizing part and the lengths of the mark memorized in the theory length memorizing part; a first contractile rate computing part for computing inherent contractile rates of all marks from the computed deviation value and an existing probability of each of the marks; a first write strategy setting part for setting an optimal write strategy by computing a correction value for the reference write strategy on the basis of the computed inherent contractile rates of and the existing probability of all the marks such that the deviation values of all the marks are within the predetermined range; a variation computing means for computing variations in lengths of the lands before and after each of the marks on the basis of the existing probability of each of the marks when the widths of the specific mark and powered pulse are varied.
