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:
May. 29, 2007
Filed:
Nov. 28, 2001
Minoru Kikuchi, Miyagi, JP;
Akio Koshita, Miyagi, JP;
Jun Nakano, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
In an optical disc in which an information signal is recorded/reproduced by irradiating a laser beam to a disc substratein which an information signal portionhas been provided on one principal plane from the side where the information signal portionexists, a clamp reference surfaceis set to the information signal portionside of a replica substrateconstructing the optical disc. The clamp reference surfaceis set to a flat surface and a thickness of the replica substratein a clamping areais set to be larger than that of the convex-shaped replica substratein an information recording area. The replica substratein which a periphery of a center holeis thicker than the information recording areais used.