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:
Apr. 24, 2001
Filed:
Feb. 25, 1999
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B 3/02 ;
U.S. Cl.
CPC ...
B32B 3/02 ;
Abstract
A multi-layered optical disc having superior recording/reproducing characteristics, in which the recording density in three-dimensional direction can be increased to increase the recording capacity, and its manufacturing method. A multi-layered optical disc,has a light reflecting layer,a second information recording layer,a transparent layer,a first information recording layer,and a light-transmitting layer,sequentially formed on a major surface,of its substrate,The laser light is illuminated from the light-transmitting layer,of the multi-layered optical disc,to record and/or reproduce information signals.