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Information recording device, information recording method, and information recording program

一种信息记录、记录标记的技术，应用在信息记录装置、信息记录、以及信息记录程序领域，能够解决裕量变窄等问题

Inactive Publication Date: 2007-03-28
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the modulation degree increases, the possibility of adverse effects on AR (aperture ratio), LPP error, and ADIP error increases.
In addition, the asymmetry at the occurrence of thermal interference becomes closer to the lower limit of the standard value or range where playback is possible, and its margin narrows

Method used

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  • Information recording device, information recording method, and information recording program
  • Information recording device, information recording method, and information recording program
  • Information recording device, information recording method, and information recording program

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0048] First, a first embodiment of the present invention will be described. In the following description, the recording powers of short marks and long marks are described before an embodiment in which test writing is performed.

[0049]FIG. 1 shows a recording pulse waveform (writing strategy) according to a first embodiment of the present invention. For comparison, the upper part in FIG. 1 shows a recording pulse waveform at the time of 8x high-speed recording of a general DVD-R, and the lower part in FIG. 1 shows a recording pulse waveform according to the first embodiment.

[0050] In FIG. 1, the record data includes a mark period Twd whose length corresponds to the record data length and a space period Tsp whose length corresponds to the record data length. In the present invention, since the length of the interval period does not matter, the description of this part is omitted in FIG. 1 .

[0051] On DVD-R, marks with lengths of 3T and 4T are formed by a recording puls...

no. 2 example

[0092] Next, a second embodiment of the present invention will be described. The second embodiment differs from the first embodiment only in the definition method of the long mark and the short mark. The lower part of Fig. 7 shows recording pulse waveforms according to the second embodiment. As shown, in the first embodiment, the shortest mark (3T) and the second shortest mark (4T) are defined as short marks, and marks (equal to or greater than 5T) other than the short marks are defined as long marks . Thereafter, test writing in which the recording power of the long marks is fixed and the peak powers Po1 and Po2 of the short marks are varied is performed.

[0093] Meanwhile, in the second embodiment, only the shortest tag (3T) is defined as a short tag, and tags (equal to or greater than 4T) other than the shortest tag are defined as long tags. Therefore, test writing was performed such that the peak power Pon and the intermediate bias power Pm of marks equal to or larger ...

no. 3 example

[0096] Next, a third embodiment will be described. The third embodiment also differs from the first embodiment only in the definition method of the long mark and the short mark. Fig. 8 shows a schematic diagram of recording pulse waveforms in the third embodiment. The upper part of FIG. 8 shows the recording pulse waveform in the case where the 6T mark does not become the maximum amplitude, and the lower part of FIG. 8 shows the recording pulse waveform in the case where the 6T mark becomes the maximum amplitude.

[0097] In the third embodiment, it is defined that a mark whose RF signal waveform does not become the maximum amplitude is a short mark and a mark whose RF signal waveform becomes the maximum amplitude is a long mark. However, whether a certain mark becomes the maximum amplitude varies depending on recording conditions and recording media. In general, marks from 3T to 5T do not become the maximum amplitude, and marks equal to or greater than 7T become the maximum...

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Abstract

There are provided an information recording device, an information recording method, and an information recording program capable of recording information with an appropriate modulation degree, a high asymmetry, and small waveform distortion. The information recording device applies a laser beam to a recording medium such as a DVD-R / RW and DVD+R / RW and forms a recording mark corresponding to a recording signal, thereby recording information. A recording pulse signal for forming the recording mark corresponding to the recording signal has a mark period for forming the recording mark and a space period not forming the recording mark. In test recording performed prior to actual information recording, a long mark recording power is kept constant while a short mark recording power is changed. Preferably, the short mark recording power in the test write is changed so that the asymmetry and / or the beta value is a value within a desired range. Thus, the short mark recording power can be appropriately decided so as to obtain a desired recording characteristic. Moreover, actual recording is performed by using the recording power thus decided.

Description

technical field [0001] The present invention relates to a technique for recording information onto an optical disc by using laser light. Background technique [0002] Information is recorded on a recordable or rewritable optical disc such as DVD-R (DVD Recordable) or DVD-RW (DVD Recordable) by irradiating laser light onto the recording surface of the disc. Since the temperature rises in the portion of the recording surface of the optical disc to which the laser light is irradiated, the optical recording medium used to form the optical disc changes, and thus recording marks are formed on the recording surface. [0003] Therefore, by modulating the laser light with a recording pulse whose time width corresponds to the information to be recorded, a laser pulse having a length corresponding to the signal to be recorded is generated, and by irradiating the generated laser pulse to the optical disc , a recording mark whose length corresponds to the information to be recorded is f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0045G11B7/125G11B7/006
CPCG11B7/1267G11B7/0062G11B7/00456
Inventor 佐佐木仪央内野裕行堀川邦彦
Owner PIONEER CORP