Optical informaton recording medium

Details Optical informaton recording medium Optical informaton recording medium

2011-07-19

2011-07-19

Mulvaney, Elizabeth (Department: 1785)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C430S270140

Reexamination Certificate

active

07981494

ABSTRACT:
In a write-once optical information recording medium including a substrate, a groove-shaped track such as a guiding groove, and an optical recording layer containing an organic dye material and disposed on the guiding groove, wherein information is recorded by irradiating a short-wavelength laser beam from a surface of the optical recording layer opposite the substrate, and the information can be reproduced by reading a change in the reflected light of a short-wavelength laser beam after the information recording, an unrecorded portion of the optical recording layer has a lower reflectance than a pit portion formed after recording to a portion of the optical recording layer, the optical recording layer has a refractive index n in the range of about 1.2 to about 2.1 before recording and an extinction coefficient k in the range of about 0.01 to about 0.7 before recording, and n+k is in the range of about 1.4 to about 2.1.

REFERENCES:
patent: 5855979 (1999-01-01), Umehara et al.
patent: 2005/0219997 (2005-10-01), Morita et al.
patent: 2003-303442 (2003-10-01), None
patent: 2005-297406 (2005-10-01), None

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