| 摘要 |
PURPOSE:To obtain an optical disk apparatus having high reliability by obtaining a true optimum recording power and recording with the power. CONSTITUTION:An area (test area) for obtaining an optimum recording power is erased, and reference data to be output from a reference data generator 23 is recorded on the test area with recording power Pwn. A focus track controller 11 is controlled by a CPU 22, data recorded with the power Pwn is altered, for example, to a state having a focus offset, and then reproduced. At the time of reproducing the data, a signal detected by a signal detecting optical system is fed through an analog signal processor 24, binarized by a binarizer 25, compared with the reference data generated from the generator 23 by a comparator 26, and number of errors (discordant number) is counted. This is executed by altering the Pwn to obtain a correlation between the recording power and the number of errors. |
