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:
Feb. 07, 2012
Filed:
May. 21, 2009
Applicants:
Sohmei Endoh, Tokyo, JP;
Tadao Suzuki, Tokyo, JP;
Jun Shimizu, Tokyo, JP;
Jun Nakano, Tokyo, JP;
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/00 (2006.01); G11B 7/26 (2006.01);
U.S. Cl.
CPC ...
Abstract
In an optical recording and reproducing medium having a grooveformed along a recording track and which is recorded and/or reproduced with irradiation of light L having a predetermined wavelength λ, a track pitch p of the grooveis selected in a range of from 200 nm to 350 nm and a ratio w'/p between a width wof the grooveand the track pitch p is selected in a range of from 0.24 to 0.67.