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:
Jun. 19, 2001
Filed:
Sep. 26, 1995
Hideki Hirata, Nagano, JP;
Hajime Utsunomiya, Nagano, JP;
Isamu Kuribayashi, Nagano, JP;
Hiroshi Tanabe, Nagano, JP;
TDK Corporation, Tokyo, JP;
Abstract
The invention provides an optical disc comprising a circular glass substrate (,) having information-carrying means (,) on one major surface. A protective member (,) of a resin includes a circular flat portion (,) and an annular rim (,) extending perpendicular from the periphery of the flat portion (,). The glass substrate (,) is integrally joined to the protective member (,) such that the information-carrying means (,) of the glass substrate (,) may face the covering portion (,) of the protective member (,). The outer side of the glass substrate (,) is surrounded by the protective member rim (,) to leave a shock absorbing space therebetween. The invention prevents the glass substrate from failure at its corner when impact is applied to the disc.