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:
Jan. 10, 2017
Filed:
May. 28, 2012
Takao Watanabe, Tokyo, JP;
Manabu Shiozawa, Tokyo, JP;
Koichi Watanabe, Tokyo, JP;
Shigeharu Kimura, Tokyo, JP;
Takao Watanabe, Tokyo, JP;
Manabu Shiozawa, Tokyo, JP;
Koichi Watanabe, Tokyo, JP;
Shigeharu Kimura, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When a simple magnification optical system is used in reproduction of a recording medium in which a large number of minute modified regions are three-dimensionally formed inside solid matter, contrast is insufficient and interlayer crosstalk is increased, and therefore, it is impossible to take a sufficient S/N ratio. Provided is a recording medium in which at least one layer is configured by a set of two adjacent sub-layers, and dots on a sub-layer correspond to a recording data '1' and dots on the other sub-layer correspond to '0'. These data are played back.