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:
Oct. 26, 2010
Filed:
May. 31, 2002
Kazuhiro Hayashi, Kadoma, JP;
Kazuya Hisada, Osaka, JP;
Shinya Abe, Kadoma, JP;
Kazuhiro Higashimaru, Kadoma, JP;
Eiji Ohno, Hirakata, JP;
Kazuhiro Hayashi, Kadoma, JP;
Kazuya Hisada, Osaka, JP;
Shinya Abe, Kadoma, JP;
Kazuhiro Higashimaru, Kadoma, JP;
Eiji Ohno, Hirakata, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A method of manufacturing an optical information recording medium to/from which signals can optically be recorded and reproduced. The recording medium includes a signal substrate (), a signal recording layer (), and a transparent cover layer () having a first transparent layer () and a second transparent layer (), which is harder than the first transparent layer (). Signals can be recorded and reproduced to and from the recording medium by a light transmitted to the signal recording layer through the transparent cover layer (). The first transparent layer is formed so as to have a first predetermined distribution of thickness. The second transparent layer is formed so as to have a second predetermined distribution of thickness to make the total thickness of the transparent cover layer () uniform. The first transparent layer () may be made of a plurality of thin laminated transparent layers.