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:
May. 31, 1994
Filed:
Jan. 05, 1993
Applicant:
Inventors:
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ; G11B / ;
U.S. Cl.
CPC ...
430495 ; 430270 ; 430945 ; 369284 ; 369288 ; 3461351 ;
Abstract
An optical recording medium having at least a pair of recording films which have a predetermined light absorption distribution and have steep absorption end slopes which are closer to each other. The difference between the wavelengths of recording or reproduction lights for these two recording films may be close to about 50 nm. A common optical system may be used for recording or reproduction operation for the two recording films, whereby the optical system may be simplified.