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US 5,670,295 AGranted
Optical recording medium
OwnerKenryo Namba, Akihiko Kuroiwa +1inventors
InventorsKenryo Namba, Akihiko Kuroiwa, Shiro Nakagawa
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Abstract
An optical recording medium has deposited on a substrate a recording layer incorporating therein a cyanine dye, preferably an indoline dye, and optionally incorporating therein an autoxidizable compound or a thermoplastic resin andr a singlet oxygen quencher.
Claims4
An optical recording medium of the heat mode type free of quenchers and resins comprising a substrate having deposited thereon a recording layer comprising at least one laser light absorbing dye and having a thickness in the range of from 0.03 to 2 um, said dye being represented by the general formula III:
- ##STR77## wherein Q and Q.sup.1 each denote a condensed aromatic ring, R.sub.1 and R.sub.1' each denote a substituted or unsubstituted alkyl group at least one of R.sub.1 and R.sub.1 ' contains up to four carbon atoms R.sub.2, R.sub.2', R.sub.3 and R.sub.3', each denote an alkyl group or an aryl group, L' denotes a methine chain for the formation of a mono-, di-, tri- or tetra-cyanine, X-denotes an anion, and m denotes 0 or 1.
Dependencies are inferred from the claim text.