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:
Sep. 06, 1994
Filed:
Jan. 25, 1993
Yuichi Higuchi, Yokohama, JP;
Victor Company of Japan, Ltd., Kanagawa, JP;
Abstract
The present invention discloses a disc having an information signal surface on which a replica of information signals is formed by a stamper provided in a metal mold, and a manufacturing method of the disc. The disc includes a disc substrate having a generally flat surface on which the replica of the information signal is formed, a center through hole formed at a center thereof and a ring groove inevitably formed as an inverted replica by a shape of a collar of a retainer which is provided in the metal mold to support the stamper. The ring groove concentrically divides the generally flat surface into inner and outer surfaces. A reflecting layer is provided on the generally flat surface for reflecting reading light from a reproducing apparatus. Further, a protecting layer is provided on the reflecting layer for protecting the reflecting layer. Resin is filled in the ring groove for causing the inner and the outer flat surface to be bridged and flush each other for printing a label at a desired area of the inner and the outer surfaces without being interrupted by the ring groove.