Recording wave form control method of optical disk and optical disk device using the method

Abstract

Recording waveform control method of optical disk and optical disk device using the method. In a writing system in which the linear velocity changes during a write operation, it is difficult to determine the writing waveform parameters for all possible speeds through test write operation. Therefore, some representative values must be used to estimate them. This means that it is necessary to enhance the accuracy of this estimation process. The present invention determines a condition for a high speed and an optimum write condition for a low speed through test write operation and obtains a condition for a middle speed based on a recommended value written on the disk. Especially, the present invention can waveform-convert the waveform parameter for a multi-pulse portion of a multi-pulse writing waveform without changing its energy to produce an accurate waveform parameter.

Description

technical field [0001] The present invention relates to an optical disc device for recording and reproducing information on a disc by using a semiconductor laser, and in particular to an optical disc device for recording on a medium whose characteristics vary with respect to recording speed. Background technique [0002] As a conventional example of a recordable optical disc that can be recorded while changing the linear velocity, there is an example of recording at a constant rotational speed (CAV) (for example, refer to Japanese Patent Application Laid-Open No. 2003-6862 (pages 5-7), figure 1 ). The presently illustrated embodiment adopts DVD-RAM as a rewritable optical disc using phase change type material. In a conventional example, control information of recording waveforms during recording by the CAV recording method is recorded on the DVD-RAM disc. In the CAV recording method, since the linear velocity changes rapidly from the inner circumference to the outer circum...

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Problems solved by technology

However, since the parameters of the intermediate speed recorded on the disk are the recommended parameters recorded on the disk when the disk was launched, it is not necessarily the best in the combination of the recording device and the disk.

[0005] In addition, in the state where the performance is improved due to the high-speed recording, etc., although it is possible to output the recommended waveform at low speed due to the performance of the laser driver, etc., it is not possible to output the recommended waveform at high speed. The case of the waveform parameters

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