US 2007/0178270 A1 · Optical recording medium

Abstract

An optical recording medium with a high productivity is provided which can certainly record/reproduce data even when a blue or blue-violet laser beam is used as an irradiation light. An optical recording medium has a substrate and a recording layer. The recording layer includes a recording portion and a coating portion. The recording portion and the coating portion are all made substantially from Bi and O. The ratio of the number of O atoms to the total number of Bi atoms and O atoms of the coating portion is less than that of the recording portion. The ratio of the number of O atoms of the recording portion is in the range of from 62% to 77%. The ratio of the number of O atoms to the total number of Bi atoms and O atoms of the coating portion is in the range of from 60% to 70%.

Claims8

Dependent claims

An optical recording medium comprising:

a substrate;
and
a recording layer formed over the substrate, wherein:
the recording layer includes a recording portion, and a coating portion which coats at least one side of the recording portion in a direction of thickness;
the recording portion and the coating portion are both made substantially from Bi and O;
a ratio of number of O atoms to a total number of Bi atoms and o atoms of the coating portion is less than that of the recording portion;
a ratio of number of O atoms to a total number of Bi atoms and o atoms of the recording portion is in a range of from 62% to 77%;
and
the ratio of the number of O atoms to the total number of Bi atoms and O atoms of the coating portion is in a range of from 60% to 70%.

6 more elements

Dependencies are inferred from the claim text.

Optical recording medium

Life of this patent

Optical recording medium

Life of this patent

Abstract

Claims8