Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2003-05-26
2010-02-02
Feild, Joseph H (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
Reexamination Certificate
active
07656777
ABSTRACT:
An optical recording medium which is a multilayer optical recording medium including a plurality of recording layers and records or reproduces information by the irradiation of light having a wavelength of λ0. At least one recording layer out of a plurality of recording layers includes a variable absorption film. The variable absorption film contains a material in which an electron energy has a band structure, and the absorption end of an absorption spectrum moves toward a longer wavelength side with a rise in temperature when light is absorbed by transition between electron bands, has a first absorptance to light having a wavelength of λ0 when a film temperature is a first temperature (application environment temperature), and has a second absorptance higher than the first absorptance to light having a wavelength of λ0 when a film temperature is a second temperature higher than the first temperature.
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Ito Tatsuo
Mizuno Sadao
Nishino Seiji
Shiono Teruhiro
Yamamoto Hiroaki
Feild Joseph H
Hamre Schumann Mueller & Larson P.C.
Heyi Henok G
Panasonic Corporation
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