Optical disc recording method and apparatus

Details Optical disc recording method and apparatus Optical disc recording method and apparatus

2008-07-22

2008-07-22

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Control of information signal processing channel

C369S047510, C369S053340, C369S059110

Reexamination Certificate

active

07403456

ABSTRACT:
An optical disc recording method and apparatus is capable of overwriting a phase change optical disc at high speed. With a preceding erasing beam out of two laser beams, a modulation component in an RF signal recorded on an optical disc is erased to a state where no problem occurs (the reflectance difference is reduced) and the top level is decreased to 70 to 40% of a top level of an original RF signal. After that, with the subsequent recording beam, a space is recorded at a laser power at which top level is reset to the original state (before the erasing process), and a mark is recorded at a laser power which can sufficiently decrease the bottom level. Consequently, even when the recording speed is the quadruple speed (about 1.6 to 2 times of a specification) much higher than a specific recording speed (for example, 2 to 2.4×) of a phase change optical disc, overwriting can be performed with a recording characteristic which can satisfy a regenerating characteristic specification.

REFERENCES:
patent: 4841514 (1989-06-01), Tsuboi et al.
patent: 5463610 (1995-10-01), Nishikawa
patent: 7035184 (2006-04-01), Takeda
patent: 7-262565 (1995-10-01), None
patent: 2001-344762 (2001-12-01), None
patent: 2002-183967 (2002-06-01), None

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