Patent ID: 7402375

Claim:
A light absorbent composition applied to an optical recording medium substrate having a track pitch of below 0.74 microns comprising (a) a monomethine cyanine dye of Formula 1 which has an absorption maximum at a wavelength of 450 nm or less when in a thin layer form; and (b) organic dye compounds other than said monomethine cyanine dye, said organic dye compounds being sensitive to a laser beam with a wavelength of 775 to 795 nm: ø1−CH=ø2 Formula 1: wherein in Formula 1, ø1 is a heterocyclic group represented by Formula 5 and ø2 is a heterocyclic group represented by any one of Formulae 2, 3, 4, 6, 7 and 8 as resonance structures; wherein throughout Formulae 2 to 5, Z represents an optionally substituting mono- or polycyclic aromatic ring or heterocycle which condenses to a nitrogen atom-containing five-membered heterocycle; throughout Formulae 2 to 8, R 1 represents an aliphatic hydrocarbon group and R 2 represent hydrogen atom or the same or different aliphatic hydrocarbon group as in R 1 , wherein the aliphatic hydrocarbon groups may have a substituent, and in Formulae 2 to 8, X − represents an azo metal complex anion being a member selected from the group consisting of: and (i) optionally at least one formazan metal complex.