CD recorder and CD record medium

Abstract

An optical disc recording device, including an optimal recording power calculation device, capable of changing the recording power, recording a test recording area of ​​an erasable optical disc, and obtaining an optimal recording power according to a signal regenerated from the test recording area; and The optimum erasing power calculating device obtains the optimum erasing power from the coefficient corresponding to the optimum recording power and the optimum recording power. By using the optimal recording power and the optimal erasing power to record the erasable optical disc, even in the case of a large dispersion of recording power, since the erasing power will not exceed a certain range, the recording power and erasing power can be suppressed. In addition to the sum of the power, it is possible to suppress the deterioration of the durability of the optical disc for repeated recording.

Description

technical field [0001] The present invention relates to an optical disc recording device and an optical disc recording medium, and in particular relates to an optical disc recording device and an optical disc recording medium for recording erasable optical discs. Background technique [0002] Recording optical discs can be classified into write once type such as CD-R and erasable type such as CD-RW. Among them, as shown in FIG. 5, when recording overwrite (over write) for an erasable optical disc, the laser beam laser power used is at the recording power P w , record cooling power P c and the erase power P e Vary among the three values. In this case, the recording power P w The power to raise the temperature of the recording layer (phase change layer) to the melting point. Record cooling power P c It is low power for extremely cooling the recording layer (phase change layer) from the melting point to the amorphous state. Erase power P e It is the power to raise the t...

AI Technical Summary

Problems solved by technology

[0016] As known, OPC is used to determine the optimum recording power P wo , and multiply the best recording power by the corresponding fixed value coefficient ε to obtain the best erasing power P eo , and the method of setting the recording cooling power to a fixed power is a method with few parameters and easy setting. However, under the cooperation of the optical disc and the optical pickup, the recording power is affected by dispersion. When , the erasing power also becomes larger, so that the sum of recording power and erasing power also becomes larger, thus causing the problem of deterioration of the durability of the optical disc for repeated recording

On the contrary, the recording power is affected by dispersion. When the recording power becomes smaller, the erasing power also becomes smaller, which causes the problem of deterioration of the erasing characteristics.

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