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:
Sep. 11, 2012
Filed:
Jan. 11, 2012
Applicants:
Yoshiaki Komma, Osaka, JP;
Joji Anzai, Osaka, JP;
Masahiko Tsukuda, Osaka, JP;
Yasumori Hino, Nara, JP;
Inventors:
Yoshiaki Komma, Osaka, JP;
Joji Anzai, Osaka, JP;
Masahiko Tsukuda, Osaka, JP;
Yasumori Hino, Nara, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 3/70 (2006.01); G11B 7/26 (2006.01); B32B 3/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
An optical recording medium includes a cover layer, a plurality of recording surfaces, and a plurality of intermediate layers. The thicknesses of the layers are specifically determined and set at values which suppress a back focus problem. Because the optical recording medium suppresses back focus, the recording and reproducing of information using the optical recording medium is not obstructed.