Optical recording medium
AssigneePioneer Electronic Corporation
InventorsShuichi Yanagisawa, Tatsuro Sakai, Takashi Chuman, Yasushi Araki, Fumio Matsui
Life of this patent
Estimating the term…
Abstract
An optical recording medium comprises a light transmissive substrate, a light absorption layer provided on the light transmissive substrate and a light reflecting layer provided on the light absorption layer. The light absorption layer contains a cyanine type dye represented by a following structural formula: ##STR1## and a quencher represented by a following general formula: ##STR2## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 denote hydrogen or substituent group, respectively. A protective layer may be further provided on the light reflecting layer for protecting the same.
Claims3
An optical recording medium which can be applied to a compact disc comprising:
- a light transmissive substrate having a thickness of 1.0 to 1.5 mm;
- a light absorption layer provided on the light transmissive substrate and having a thickness of 20 to 2000 nm;
- a light reflecting layer provided on the light absorption layer and having a thickness of 0.02 to 2.0 .mu.m;
- a protective layer provided on the light reflecting layer and having a thickness of 0.1 to 100 .mu.m;
- and
- said light absorption layer containing a cyanine dye:
- ##STR10## and a quencher:
- ##STR11##
Dependencies are inferred from the claim text.