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AssigneeToyo Ink Manufacturing Co., Ltd.
InventorsTetsuya Kaneko, Kazuhiro Ishikawa, Makoto Sakamoto
Estimating the term…
The present invention provides an optical recording medium containing a phthalocyanine compound in its recording layer and, particularly, a CD-R in which the color of the disk as viewed from the substrate side disappears apparently as if the colorant-containing recording layer were not present Disclosed is an optical recording medium produced by laminating a recording layer, a reflecting layer and a protective layer on the transparent substrate, the recording layer comprising a phthalocyanine compound and a reddish colorant.
An optical recording medium formed by laminating a recording layer, a reflecting layer and a protective layer on a transparent substrate, said recording layer containing (a) a phthalocyanine compound which absorbs recording light to attain information recording and (b) a reddish colorant.
Dependencies are inferred from the claim text.
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Comprising organic materials only: containing organometallic compounds
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the…:…
Of recording layers: comprising organic materials only
Containing dyes: porphines; azaporphines, e.g. phthalocyanines
Term end not estimated
1. Field of the Invention
The present invention relates to an optical recording medium wherein it is possible to write and read out information by the application of laser radiation. Specifically, the present invention relates to a recording film structure, recording film material, and material composition of CD recordable (CD-R).
2. Description of the Related Art
The present invention will be explained in detail by way of examples hereinafter.
130 mg of the phthalocyanine compound (a) and 10 mg of VALIFAST RED 3304 (manufactured by ORIENT CHEMICAL) were dissolved in 10 ml of ethyl Cellosolve and the mixture was then passed through a 0.2μ filter. The filtered mixture solution was formed as a recording layer by using a spin coater onto a thick polycarbonate substrate prepared for a CD-R disk and provided with a guiding groove having a depth of 1800 angstroms, a half width of 0.5 μm and a pitch of 1.6 μm. The forming was conducted so that the absorbance (Abs.) of the recording layer at the wavelength of the maximum absorption peak of the reddish colorant became 0.6. Next, silver was deposited as a reflective film onto the recording layer in a film thickness of 650 angstroms by sputtering process. A protective layer was formed further onto the reflective film layer by using a UV-curable resin to obtain CD-R disk A.
As a comparative example, CD-R disk A′ was made through the same process as in Example 1 above described except that the reddish colorant VALIFAST RED 3304 was not at all added.