Patent ID: 6169721
Filing Date: 2001-01-02
Classification: G11B,Y10T

Abstract:
An optical recording medium having a substrate having a spiral groove or annular grooves, prepits between the grooves, a recording layer including an organic coloring matter and formed on the substrate, and a metallic reflection layer, comprising: the recording layer having a thickness so as to have an absorbance between 0.65 and 0.75, whereby information can be recorded in the recording layer by a laser beam having a wavelength between 600 and 700 nm, using an objective lens having a numerical aperture between 0.55 and 0.70, wherein the metallic reflection layer is made of gold film, depth of the groove is between 140 and 160 nm, width thereof is between 0.25 and 0.35 .mu.m.