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:
Dec. 01, 1998
Filed:
Sep. 26, 1996
Applicant:
Inventor:
Masaki Mochizuki, Yokohama, JP;
Assignee:
Victor Company of Japan, Ltd., Yokohama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 94 ; 3692753 ;
Abstract
A double-layer optical disk comprises first and second substrates which include information pits and are bonded at their confronting faces. Each substrate has at least one information pit formed on a surface thereof for recording the information, and receives reproduction light irradiated from a predetermined reading direction. And, the information pit formed on the first substrate is different in size from the information pit formed on the second substrate.