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. 01, 1993
Filed:
Jan. 29, 1992
Applicant:
Inventors:
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428 64 ; 428 65 ; 4284111 ; 428457 ; 428913 ; 430945 ; 346 / ; 3467351 ;
Abstract
Optical recording media include substrates of a larger diameter formed by injection molding a copolymer of ethylene with a cyclic olefin. The media are adapted for high speed rotation with the benefits of a high output, high C/N, and low noise level. When a protective substrate of glass is attached to the polyolefin substrate such that the recording layer is inside, there is obtained a light-weight rigid disk which experiences minimal axial runouts and hence, minimal focusing errors during high rotational speed operation.