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:
Apr. 12, 2011
Filed:
Apr. 06, 2005
Kazuhiro Hayashi, Osaka, JP;
Keiji Nishikiori, Kyoto, JP;
Sou Miyata, Chiba, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A transparent protective layer () having a thickness of 100 μm is formed of a resin film (), a boundary layer () and an adhesive layer () on a signal recording layer (). When nf, ni and na are the indices of refraction of the resin film (), the boundary layer () and the adhesive layer (), respectively, the relationship among nf, ni, and na satisfies any one of the following equation: na<ni≦nf; na>ni≧nf; na<nf≦ni; or na>nf≧ni, and the relationship among nf, ni, and na satisfies the following equation |nf−ni|<|nf−na|. At this time, a protrusion () and a scratch () are optically buried within the boundary layer (), reducing scattering of laser beams and disturbance in the wave front which occur in these portions, and thereby, the error rate can be reduced.