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US 4,900,648 AGranted
Optical information recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsTakanori Hioki, Yoshio Inagaki, Masao Yabe
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AssigneeFuji Photo Film Co., Ltd.
InventorsTakanori Hioki, Yoshio Inagaki, Masao Yabe
Estimating the term…
The present invention relates to an optical information recording medium for carrying out recording, reproduction and erasing with laser beams which comprises a support having carried thereon at least one methine dye which consists of an azulene nucleus, at least one of 10 carbon atoms of which is replaced by chalcogen atom(s) and/or nitrogen atom(s), and further whose 7-membered ring part is substituted with a methine bond having at the terminal an auxochrome which forms a conjugated resonance chromophore together with a 10 .pi. electron system of the nucleus. Optical information recording media of the invention have adequate recording characteristics having high C/N, and have high stabilities against long-term preservation or against long-time reading.
An optical information recording medium for carrying out recording and reproduction with laser beams which comprises a support having carried thereon at least one methine dye which comprises an azulene nucleus, at least one of the two carbon atoms at the 1 and 3 positions of which is replaced by a chalcogen atom or a nitrogen atom, and further whose 7-membered ring part is substituted with a methine bond having at the terminal an auxochrome which forms a conjugated resonance chromophore together with a 10 .pi. electron system of the nucleus.
Dependencies are inferred from the claim text.