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:
Dec. 16, 2014
Filed:
Jul. 11, 2014
Sharp Kabushiki Kaisha, Osaka, JP;
Memory-tech Corporation, Chikusei, JP;
Hideharu Tajima, Osaka, JP;
Go Mori, Osaka, JP;
Yasuhiro Harada, Osaka, JP;
Masaki Yamamoto, Osaka, JP;
Hirohisa Yamada, Osaka, JP;
Masahito Konishi, Chikusei, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Memory-Tech Corporation, Ibaraki, JP;
Abstract
An optical information recording medium has a first information recording layer () and a second information recording layer () each of which includes (i) a group of pre-pits () constituting marks () and spaces () and (ii) a super-resolution film (), the marks () and the spaces () having different lengths, an average length of a smallest mark that is smallest in length and a smallest space that is smallest in length being less than or equal to a resolution limit of a reproduction optical system for reproducing information recorded on the first information recording layer () and the second information recording layer (), the group of pre-pits () being formed so that a push-pull signal for the reproduction optical system to reproduce the information recorded by the group of pre-pits is negative in polarity. This provides an inexpensive and high-capacity multilayer optical information recording medium based on a super-resolution technology.