The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2007
Filed:
Jun. 26, 2002
Applicants:
Sohmei Endoh, Tokyo, JP;
Nobuhiro Nagano, Tokyo, JP;
Jun Nakano, Tokyo, JP;
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical recording and reproducing medium has groovesformed along recording tracks and can be recorded and/or reproduced with irradiation of light L having a predetermined wavelength λ. When n assumes a refractive index of a medium extending from a light entrance end face to the groovesof the optical recording and reproducing medium, a phase depth x of this groovesatisfies the following inequality:λ/16.14/4.99and a ratio w/p between a width w of the grooveand a track pitch p satisfies the following inequality:0.391≦()≦0.594