Double-sided high-density information storage medium
AssigneeIndustrial Technology Research Institute
InventorsWen-Yih Liao, Chih-Ming Lin, Tzuan-Ren Jeng
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Abstract
A double-sided high-density information storage medium uses a laser pickup head with blue light and light of a shorter wavelength to read and save data in order to increase the data storage per unit area on the information storage medium. The invention further uses a double-sided high-density information storage medium and a double-sided recording stack structure to increase the storage capacity, forming a double-sided two-recording-layer and double-sided four-recording-layer information storage media.
Claims22
A double-sided high-density information storage medium whose data reading and recording is performed using a short-wavelength laser pickup head with a wavelength no longer than blue light, the double-sided high-density information storage medium comprising:
- a substrate, which has a top land-and-groove surface and a bottom land-and-groove surface;
- a first recording stack, which covers the top land-and-groove surface and consists of at least one information recording layer;
- and
- a second recording stack, which covers the bottom land-and-groove surface and consists of at least one information recording layer,
- wherein said first recording stack and said second recording stack read and recorded data by a laser pickup head with wavelengths shorter than or equal to blue light.
A double-sided high-density information storage medium with four recording layers whose data reading and recording is performed using a short-wavelength laser pickup head with a wavelength no longer than blue light, the double-sided high-density information storage medium comprising:
- a substrate, which has a first top land-and-groove surface on its top surface and a first bottom land-and-groove surface on its bottom surface;
- a first top recording stack, which covers the first top land-and-groove surface and consists of at least one information recording layer;
- a first separator layer, whose one surface is stacked onto the first top recording stack surface and whose other surface is a second top land-and-groove surface;
- a second top recording stack, which covers the second top land-and-groove surface and consists of at least one information recording layer;
- a first bottom recording stack, which covers the first bottom land-and-groove surface and consists of at least one information recording layer;
- a second separator layer, whose one surface is stacked onto the first bottom recording stack surface and whose other surface is a second bottom land-and-groove surface;
- and
- a second bottom recording stack, which covers the second bottom land-and-groove surface and consists of at least one information recording layer.
Dependencies are inferred from the claim text.