Recording method and optical disk device

Details Recording method and optical disk device Recording method and optical disk device

2004-09-03

2008-03-25

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal processing for controlling recording light...

C369S059120

Reexamination Certificate

active

07349314

ABSTRACT:
In order that it is realized to put 16× speed DVD-RAM in practice, a recording method coping with CAV (constant angular velocity) and a method for improving S/N ratio are provided and an optical disk device using them is provided. In order that a cutoff phenomenon of pulse in a laser driving circuit may not occur, the shortest pulse width is set at 1 Tw or more where Tw indicates a window width, and a recording pulse in which a 4T mark is recorded with a mono pulse where T indicates a detection window width and the parameter setting range are prescribed. Simultaneously, a reproduction power for 6× speed or more is set at 1.5-2.0 mW, different from a conventional value, and a setup sequence with which deterioration of data in reproducing does not occur is provided. Thereby it becomes possible to put 16× speed DVD-RAM in practice.

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Development of Techniques For Recording Optical Disk at Ultra-High Speed to Realize 16x Speed DVD-RAM Hitachi, Ltd. Apr. 22, 2004; www.hitachi.co.jp
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Successful Development of Bismuth-Based Phase Change Recording Film (BCM Recording Film) Enabling High-Speed Recording, Hitachi Maxell, KK Apr. 22, 2004 www.maxell.co.jp/company
ews/2004.

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