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. 16, 2001
Filed:
May. 30, 2000
Sony Corporation, Tokyo, JP;
Abstract
An optical disc molding apparatus is able to mold an optical disc in which the occurrence of swollen portions of trumpet shape on the upper and lower surfaces of on the outer peripheral portion of a disc base may be minimized and in which a burr may be prevented from being produced on the outer peripheral portion of the disc base. In the optical disc molding apparatus having a ring (,) for molding an outer diameter portion of a disc base and holding a stamper (,) for transfer a signal pit, a holding surface of the ring (,) for holding the stamper (,) is formed as the concave and convex surfaces comprising a plurality of concentric land portions (,) and a plurality of concentric groove portions (,). The outer peripheral surface of the stamper (,) is held by each land portion (,) with a pressure.