Optical recording medium and recording material for the same
AssigneeRitek Corporation
InventorsWei-Hsiang WANG, Po-Fan HSU, Wei-Chong LI
Life of this patent
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Abstract
Disclosed herein is a recording material for an optical recording medium. The recording material has a composition represented by a general formula of BixGeyO(1-x-y), in which x and y respectively are atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae: 2.8≦(x/y)≦25 and 0.55≦(1−x−y)≦0.62.
Claims20
A recording material for an optical recording medium, the recording material having a composition represented by a general formula of BixGeyO(1-x-y), and an optical characteristic of the recording material being changed by irradiation of a laser beam, wherein x and y in the general formula respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae:
- 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62.
An optical recording medium, comprising:
- a substrate;
- and
- a recording layer disposed over the substrate, wherein the recording layer has an extinction coefficient of less than or equal to 0.3 and comprises a material represented by a composition formula of BixGeyO(1-x-y), wherein x and y respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae:
- 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62.
An optical recording medium, comprising:
- a substrate;
- a first passivation layer disposed on the substrate;
- a second passivation layer disposed over the first passivation layer;
- a dielectric layer disposed between the first and the second passivation layers, and having a refractive index of about 2.0 to about 2.5;
- and
- a recording layer in contact with the dielectric layer, and having a refractive index of about 2.5 to about 3.0, wherein the recording layer comprises a material represented by a composition formula of BixGeyO(1-x-y), wherein x and y respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae:
- 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62.
An optical recording medium, comprising:
- a substrate;
- a first recording structure, comprising:
- a first dielectric layer disposed over the substrate;
- and
- a first recording layer disposed on and in contact with the first dielectric layer;
- a second recording structure arranged over the first recording structure, and comprising:
- a second dielectric layer disposed over the first recording layer;
- and
- a second recording layer disposed on and in contact with the second dielectric layer;
- and
- a third recording structure arranged over the second recording structure, and comprising:
- a third dielectric layer disposed over the second recording layer;
- and
- a third recording layer disposed on and in contact with the third dielectric layer;
- wherein each of the first, second and third recording layers has an extinction coefficient of less than or equal to 0.3 and comprises a material represented by a composition formula of BixGeyO(1-x-y), wherein x and y respectively represent atomic ratios of bismuth and germanium, and satisfy the requirements of the following formulae:
- 2.8≦(x/y)≦25 and 0.55≦(1−x−y)<0.62;
- and
- wherein each of the first, second and third dielectric layers has a refractive index of about 2.0 to about 2.5.
Dependencies are inferred from the claim text.