Optical recording medium having a relationship between groove width and track pitch
AssigneeSony Corporation
InventorsSohmei Endoh, Tadao Suzuki, Jun Shimizu, Jun Nakano
Life of this patent
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Abstract
An optical recording/reproducing medium having grooves formed along recording tracks and used for recording/reproducing when irradiated with light L with a specified wavelength λ, wherein the track pitch p of a groove is at least 200 nm and up to 350 nm, and a ratio wg′/p between the width wg of a groove and a track pitch p is at least 0.24 and up to 0.67.
Claims11
An optical recording and reproducing medium substrate, comprising:
- a wobbling groove formed along a recording track;
- said wobbling groove having a track pitch p selected in a range from 200 nm to 350 nm;
- said wobbling groove having a width wg;
- a ratio wg/p selected in a range from 0.24 to 0.67;
- and
- said wobbling groove having a land surface roughness selected in a range from 0.4 nm to 0.85 mm.
An optical recording and reproducing medium manufacturing stamper for molding an optical recording and reproducing medium substrate having a wobbling groove formed along a recording track, comprising:
- a groove pattern including a track pitch selected in a range of from 200 nm to 350 nm, a ratio wg′/p′ between a width wg′ of said groove pattern and a track pitch p′ of said groove pattern selected in a range from 0.24 to 0.67, and a land surface roughness selected in a range from 0.4 nm to 0.85 nm.
Dependencies are inferred from the claim text.