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:
Jul. 10, 2001
Filed:
Aug. 03, 1999
Applicant:
Inventors:
Akira Okuda, Sakai, JP;
Tetsuo Imada, Neyagawa, JP;
Shigeru Namiki, Kadoma, JP;
Masahiro Yamamoto, Osaka, JP;
Mikio Takebayashi, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 3/02 ;
U.S. Cl.
CPC ...
B32B 3/02 ;
Abstract
A half-transmissive film of an optical disk is formed using a Cu oxide instead of Au, while achieving similar reflectivity characteristics to those of Au. Alternatively, the half-transmissive film may comprise a compound of Cu with a corrosion-resistant material, or a stack of layers comprising a lower layer film of Cu, Ag, or Al and an upper layer film of a corrosion-resistant material. Further, the half-transmissive film may comprise ZnS.SiO,, a nitride of Ti, indium-tin-oxide, or an alloy of Au and Cu or a compound including Au and Cu.