Patent ID: 6214519
Filing Date: 2001-04-10
Classification: G11B,Y10S

Abstract:
An optical recording medium comprising a transparent substrate and at least a recording layer containing an azo chelate dye and not containing cyanine dye, a reflecting metal layer and a protective layer sequentially laminated on the substrate in this order, which has the following characteristics (a) to (c):(a) the substrate has a tracking groove with a track pitch of from 0.7 to 1.0 .mu.m and the recording layer shows a modulation amplitude of EFM signal of at least 50% when recording is carried out by a laser beam with a wavelength of from 600 to 700 nm, and has a reflectance of from 45 to 65%;(b) in a thermogravimetric analysis of the dye, the inclination of the weight reduction to the temperature in the main weight reduction process is at least 13%/.degree.C.; and(c) in the thermogravimetric analysis of the dye, the total weight reduction in the main weight reduction process is at least 25%.