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AssigneeMitsui Toatsu Chemicals, Inc.
InventorsShin Aihara, Hideki Umehara, Masatoshi Yanagimachi, Yoshiteru Taniguchi, Sumio Hirose
Estimating the term…
There is provided with an optical recording medium comprising at least a dye-containing recording layer and a reflective layer laminated on a transparent substrate in this order which has a reflectance of 65% or higher, measured through the substrate, to a light beam having a selected wavelength (.lambda.1) of from 770 to 830 nm and has a reflectance of 15% or higher to a light beam having a selected wavelength (.lambda.2) of from 630 to 690 nm and which is recordable and reproducible with a laser beam having the wavelength of .lambda.1 and being reproducible with a laser beam having the wavelength of .lambda.2. In addition, the recording layer has a dye A having the absorption maximum at the wavelength shorter than 630 nm mixed with a dye B having the absorption maximum at the wavelength of from 630 to 900 nm. Alternatively, an interference layer is provided along with the recording and reflective layers. The recording layer is based on a phthalocyanine dye while the interference layer is based on an inorganic dielectric, a polymer, or an azo dye. The requirements for the interference layer are also provided.
An optical recording medium recordable and reproducible with a laser beam having longer wavelength and reproducible with a laser beam having shorter wavelength, which optical recording medium has at least a dye-containing recording layer laminated on a transparent substrate and a reflective layer deposited directly on the recording layer, the medium having a reflectance of 65% or higher, measured through the substrate to a light beam having a selected wavelength (.lambda.1) of from 770 to 830 nm and having a reflectance of 15% or higher, measured through the substrate to a light beam having a selected wavelength (.lambda.2) of from 630 to 690 nm, the medium thereby being recordable and reproducible with a laser beam having the wavelength of .lambda.1 and being reproducible with a laser beam having the wavelength of .lambda.2, wherein the following relationships hold:
An optical recording medium recordable and reproducible with a laser beam having longer wavelength and reproducible with a laser beam having shorter wavelength, which optical recording medium has at least a dye-containing recording layer, an interference layer and a reflective layer laminated on a transparent substrate, the medium having a reflectance of 65% or higher, measured through the substrate to a light beam having a selected wavelength (.lambda.1) of from 770 to 830 nm and having a reflectance of 15% or higher, measured through the substrate to a light beam having a selected wavelength (.lambda.2) of from 630 to 690 nm, the medium thereby being recordable and reproducible with a laser beam having the wavelength of .lambda.1 and being reproducible with a laser beam having the wavelength of .lambda.2, wherein the interference layer is provided between the substrate and the recording layer, or between the recording layer and the reflective layer, and the following relationships hold:
An optical recording medium as claimed in claim 8 or 11, wherein the interference layer is made of an inorganic dielectric or a polymer.
A method of recording and reproducing information on and from an optical recording medium having at least a dye-containing recording layer and a reflective layer laminated on a transparent substrate in this order, the medium having a reflectance of 65% or higher, measured through the substrate, to a light beam having a selected wavelength (.lambda.1) of from 770 to 830 nm and having a reflectance of 15% or higher, measured through the substrate, to a light beam having a selected wavelength (.lambda.2) of from 630 to 690 nm, the method comprising the steps of recording and reproducing information on and from the medium with a laser beam having the wavelength of .lambda.1 and reproducing the information recorded at the wavelength .lambda.1 from the medium with a laser beam having the wavelength of .lambda.2.
Dependencies are inferred from the claim text.