Patent ID: 7599271
Filing Date: 2009-10-06
Classification: G11B

Abstract:
1. An optical disk apparatus that records and reproduces information by irradiating an optical disk medium with an optical laser pulse, and performs trial writing that optimizes the laser pulse irradiating condition, comprising: a means of recording a predetermined trial writing pattern in a predetermined region of the optical disk medium changing the laser beam irradiating condition; a means of reproducing the predetermined data, and obtaining a first reproducing signal; a means of detecting an edge position of the first reproducing signal, and detecting an edge signal level; a means of judging the edge signal level is outside the range of multiple thresholds, generating logical pulses for estimating quality of reproduced signal of the trial writing pattern; a means of selecting a logical pulse from the plurality of logical pulses in accordance with a combination of patterns having mark length, or the front and rear space length and mark length of the edge; a means of binarizing the first reproducing signal, and obtaining a binary data row; and a means of a data pattern from the binary data row in accordance with the front and rear space length and mark length of the edge, counting the selected logical pulse in units of the data patterns, and generating a count value table of the logical pulse, wherein the laser pulse irradiating condition is decided based on the selected logical pulse, and wherein the laser pulse irradiating condition is decided using the count value in the logical pulse table.