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. 10, 2012
Filed:
Nov. 16, 2006
Record medium, its manufacturing method, mother disc for record medium, and its manufacturing method
Sohmei Endoh, Miyagi, JP;
Takahiro Igari, Miyagi, JP;
Makoto Watanabe, Miyagi, JP;
Hiroyuki Takemoto, Miyagi, JP;
Tadao Suzuki, Miyagi, JP;
Katsuhiko Ohtomo, Miyagi, JP;
Yuko Asano, Miyagi, JP;
Hiroshi Nakayama, Miyagi, JP;
Sohmei Endoh, Miyagi, JP;
Takahiro Igari, Miyagi, JP;
Makoto Watanabe, Miyagi, JP;
Hiroyuki Takemoto, Miyagi, JP;
Tadao Suzuki, Miyagi, JP;
Katsuhiko Ohtomo, Miyagi, JP;
Yuko Asano, Miyagi, JP;
Hiroshi Nakayama, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
Binary information previously recorded in an innermost rim side area is enabled to be stably reproduced. A record medium is formed by sequentially laminating a first information layer, an intermediate layer, a second information layer, and a cover layeronto a substrate. First grooves are previously formed in the innermost rim area of the substrate. Second grooves are previously formed in an area where data is recorded. The first grooves are set to be shallower and narrower than the second grooves. Thus, such a situation that a BCA signal is modulated by diffraction due to the grooves can be reduced.