CD recorder and CD record medium

Abstract

An optical recording apparatus comprises an optimum recording power calculating device, capable of varying a recording power to perform a recording process on a test recording area of the erasable optical disc, and calculating an optimum recording power according to signals that reproduce the test recording area; and an optimum erasing power calculating device, for calculating an optimum erasing power from the optimum recording power and a coefficient corresponding to the optimum recording power. The optimum recording power and the optimum erasing power are used for recording the erasable optical disc. Thereby, even though the dispersion of the recording power becomes large, the erasing power is not greater than a certain range; therefore, the total of the recording power and the erasing power can be restrained and the degradation of the durability, that the optical disc can be repeatedly recorded, can be suppressed.

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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