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US 5,292,615 AGranted
Optical recording medium
AssigneePioneer Electronic Corporation
InventorsTakashi Yamada, Fumio Matsui
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Abstract
An optical recording medium having a recording film which comprises a phthalocyanine type coloring matter and a light absorbing agent having an absorption in the wavelength region corresponding to the laser recording wavelength. Such an optical recording medium is excellent in light resistance, is capable of providing a clear pit having a neat configuration at the time of recording and is capable of providing a sufficient reproduction characteristic.
Claims7
An optical recording medium comprising a substrate and a recording film disposed thereon;
- wherein the recording film comprises a phthalocyanine-type coloring matter and a light absorbing agent comprising a polymethine cyanine dye having an absorption in a wavelength region corresponding to a laser recording wavelength, and wherein said light absorbing agent is present in an amount of 5-20 wt % based on the phthalocyanine-type coloring matter, said phthalocyanine-type coloring matter being represented by formula (I):
- ##STR3## wherein R.sub.1 represents a linear alkyl group, and each R.sub.2 represents any one of Cl, CH.sub.3, SO.sub.2 or an aromatic group, and Me represents a metal atom;
- and said light absorbing agent being represented by formula (II):
- ##STR4## wherein R.sub.3 and R.sub.4 each represents an alkyl group having 1-5 carbon atoms, and R.sub.5 represents a hydrogen atom or a substituent group, and x.sup.- represents a counter ion.
1 more element
Dependencies are inferred from the claim text.