Information recording method, information recording apparatus, optical disk, program and computer readable recording medium

A technology of information recording and recording power, which is applied in the fields of information recording, information recording devices, optical discs, programs and computer-readable recording media, and can solve problems such as excessive time

Inactive Publication Date: 2008-09-03
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it takes a lot of time to optimize the recording conditions

Method used

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  • Information recording method, information recording apparatus, optical disk, program and computer readable recording medium
  • Information recording method, information recording apparatus, optical disk, program and computer readable recording medium
  • Information recording method, information recording apparatus, optical disk, program and computer readable recording medium

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Experimental program
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Effect test

no. 1 approach

[0109] First, recording and reproduction of multivalued data in the information recording method of the present invention will be described. In order to form multi-valued data, it is mainly necessary to perform recording pulse optimization. Roughly speaking, this method is a method of performing test recording, suppressing thermal disturbance during recording based on the monitoring results, and determining a recording pulse condition that minimizes variations in reproduced signals.

[0110] Here, as shown in Figure 1, the recording pulse of 1 unit is composed of a set of top pulse, cut-off pulse and erasing pulse, and the reflected light intensity is controlled by the top pulse width Ton, the cut-off pulse width Ton, the recording power Pw and the erasing power Pe .

[0111] Furthermore, as recording conditions, the procedure for obtaining recording characteristics necessary for selecting an optimum recording pulse width will be described with reference to the schematic flow...

no. 2 approach

[0149] In the second embodiment of the present invention, the top pulse width is set according to the multivalued data so that the off pulse width is linear with respect to the multivalued data. Thereby, a margin for adjustment of the off pulse width is ensured.

[0150] As an example, in the case of wavelength 405nm, NA: 0.65, cell length: 0.28μm, as Figure 9 as well as Figure 10 As shown, when forming each mark of multi-valued data 0, 1, 2, the top pulse width is increased (the top pulse coefficient is increased).

[0151] It will be described in detail below. The optical disc of this embodiment is a phase-change optical disc capable of recording with laser light having a wavelength of 405 nm. The substrate was made of polycarbonate with a diameter of 120 mm and a thickness of 0.6 mm, and grooves were formed on the surface of the substrate by injection molding. It is formed in a continuous spiral shape from the inner circumference to the outer circumference at a track ...

no. 3 approach

[0196] The length of the recording mark, which is not linear with the cut-off pulse width, depends on the recording spot diameter, and it is known from experimental results that it is around 1 / 4 of the spot diameter. Therefore, in the third embodiment of the present invention, when recording multi-valued data whose recording mark length is 1 / 4 or less of the dot diameter, the vertex pulse coefficient is increased to maintain the linearity between the multi-valued data and the vertex pulse width. Here, the recording mark length corresponding to multivalued data depends on the recording linear density, ie, the cell length. Thus, the multivalued data increasing the peak pulse width coefficient is changed according to the combination of the recording spot diameter and the cell length. It will be described in detail below.

[0197] In the above-mentioned second embodiment, the area of ​​the recording mark where the vertex pulse coefficient j is increased differs depending on the r...

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Abstract

It is possible to decide an optimal recording power and an optimal recording pulse width regardless of the optical disc and device individual differences and the environmental condition in a multinary recording method. The method includes: a first step (steps S2 to S8) for successively changing the top pulse width Ton for test-recording first test data and monitoring the reflected light intensity corresponding to the data; a second step (steps S9 to S11) for deciding an optimal top pulse width Ton from the monitoring result; a third step (steps S13, S14) for deciding an optimal off pulse width Toff corresponding to the multinary data from the monitoring result at the optimal top pulse width Ton decided; and a fourth step (steps S15 to S23) for using the decided optimal top pulse width Ton and the optimal off pulse width Toff so as to successively change the recording power, test-record second test data, monitor the reflected light intensity corresponding to the data, and decide the optimal recording power from the monitoring result.

Description

technical field [0001] The present invention relates to an information recording method for recording recording marks corresponding to multi-valued data on an optical disc such as a rewritable phase-change optical recording medium, an information recording device and an optical disc, and a program and recording for causing a computer to execute the above-mentioned information recording method A computer-readable recording medium containing the program. Background technique [0002] In recent years, with the advancement of digital technology and the improvement of data compression technology, as a medium for recording information such as music, movies, photos, and computer software (hereinafter also referred to as "content"), CD-ROM may be available in the same format as CD. Optical disks such as DVD-ROMs, which record data approximately seven times the size of CDs, have attracted attention, and with the reduction in price, optical disk devices for reproducing content recorde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/0045G11B7/125G11B7/013G11B7/1267
Inventor 竹内弘司横井研哉加藤行子
Owner RICOH KK
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