Method of recording information in optical recording medium,...

Details Method of recording information in optical recording medium,... Method of recording information in optical recording medium,...

2003-02-14

2011-10-11

Duda, Kathleen (Department: 1722)

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

C369S094000

Reexamination Certificate

active

08034530

ABSTRACT:
It is an object of the present invention to provide an information recording method for recording information in a data rewritable type optical recording medium having a plurality of information recording layers, which can form recording marks having good shapes. In the information recording method according to the present invention, information is recorded in an optical recording medium10having at least a stacked L0 layer20and L1 layer30by projecting a laser beam thereonto whose power is modulated between a plurality of powers including at least a recording power (Pw) and an erasing power (Pe) via a light incidence plane13a. When information is recorded, λ/NA is set to be equal to or shorter than 700 nm, where λ is a wavelength of the laser beam and NA is a numerical aperture (NA) of an objective lens, and a ratio (Pe/Pw) of the recording power and the erasing power when information is to be recorded in the L0 layer20is set to be smaller than that when information is to be recorded in the L1 layer30.

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Narumi, Kenji et al., “45GB Rewritable Dual-Layer Phase-Change Optical Disk with a Transmittance Balanced Structure”, Technical Digest ISOM'01, International Symposium on Optical Memory 2001, Oct. 16-19, 2001, 3 pgs.

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