Optical recording medium, optical recording device and...

Details Optical recording medium, optical recording device and... Optical recording medium, optical recording device and...

2005-05-10

2005-05-10

Tran, Thang V. (Department: 2653)

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal processing for controlling recording light...

Reexamination Certificate

active

06891790

ABSTRACT:
A laser beam is directed to an optical recording medium such as a DVD-R to successively form thereon marks of a length corresponding to data with a spacing disposed therebetween. A Q value or the amount of reduction in time causes the rise time of laser irradiation to be delayed with respect to the scheduled rise time at least after a spacing equal in length to the mark of the shortest length employed for recording. The Q value satisfies the following equation (1) expressed in terms of the relationship between the recording speed n and an asymmetry. That is,in-line-formulae description="In-line Formulae" end="lead"?(0.54×Asymmetry−1.1)
≦Q≦(0.54×Asymmetry−0.1)
  (1)in-line-formulae description="In-line Formulae" end="tail"?where the asymmetry is the ratio of an amplitude of the shortest mark to that of the longest mark of the recorded marks.

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DVD Specifications for Recordable Disc (DVD-R), Part 1-Physical Specifications, Version 1.0; Jul. 1997.

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