Dynamic information storage or retrieval – Binary pulse train information signal
Reexamination Certificate
2008-04-22
2008-04-22
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
Binary pulse train information signal
Reexamination Certificate
active
10927539
ABSTRACT:
A method for recording data in an optical recording disc including a substrate and a recording layer formed on the substrate and containing a phase change material as a primary component is constituted so that data can be recorded therein and data recorded therein can be erased by projecting thereonto at a high linear velocity equal to or higher than a predetermined linear velocity a laser beam whose power is modulated in accordance with a pulse train pattern including a plurality of kinds of unit pulse train patterns each having at least recording pulses whose levels are set to a recording power and bottom pulses whose levels are set to a bottom power onto the recording layer and forming a plurality of recording marks having different lengths in the recording layer, wherein among the plurality of kinds of unit pulse train patterns used for forming recording marks having different lengths those other than the unit pulse train pattern used for forming the shortest recording mark are determined so that they include recording pulses in a number corresponding to the length of the recording mark to be formed, that corresponding recording pulses included therein have a common pulse width and that each of them includes a bottom pulse whose pulse width is determined in accordance with the length of the recording mark to be formed at the end thereof. According to this method for recording data in an optical recording disc, it is possible to reduce jitter of a reproduced signal even when data are recorded at a low linear recording velocity in the recording layer designed to be suitable for recording data therein at a high linear recording velocity.
REFERENCES:
patent: 6914866 (2005-07-01), Narumi et al.
patent: 7130256 (2006-10-01), Toda et al.
patent: 08-287465 (1996-11-01), None
patent: 09305971 (1997-11-01), None
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Hirata Hideki
Kato Tatsuya
Shingai Hiroshi
Hindi Nabil
Seed IP Law Group PLLC
TDK Corporation
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