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. 28, 1994
Filed:
Oct. 21, 1991
Applicant:
Inventors:
Kenji Uchiyama, Nagano, JP;
Mamoru Usami, Saku, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
3692751 ; 369283 ; 369288 ; 428 64 ; 428 65 ; 428913 ; 430495 ; 430945 ;
Abstract
In an optical recording medium comprising a recording layer on a substrate, a reflective layer in the form of a Cu-Ag or Cu-Au alloy thin film is formed on the recording layer. The Cu-Ag alloy contains 5-40 atom% of Ag and the Cu-Au alloy contains 5-99 atom% of Au. The reflective layer has enough high reflectivity, corrosion resistance, and hardness to provide optical recording medium with improved eye pattern, minimized jitter and minimized error rate.