Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent
1996-01-31
1997-07-15
McPherson, John A.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
430945, 428 644, 428 648, G11B 724
Patent
active
056481977
ABSTRACT:
An optical disk is provided for recording data thereon as optically readable pits formed thereon and for reading data from the pits by means of a reproducing laser beam. The disk has a substrate of a light transmissive material. A reflective layer of a light reflective material is formed on one of the surfaces of the substrate. A light absorbing layer is formed on the other surface of the substrate on which the reproducing laser beam is projected. The light absorbing layer containing a coloring substance exhibiting light absorption characteristics that is small for the reproducing laser beam but large for a laser beam of a specific light wavelength band shifted from the reproducing laser beam wavelength band to a longer light wavelength side. The substrate may be of a colored substrate including the coloring substance. The light absorbing layer is not required in this case.
REFERENCES:
patent: 5190800 (1993-03-01), Yamada et al.
patent: 5281512 (1994-01-01), Kobayashi et al.
McPherson John A.
Victor Company of Japan Ltd.
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