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:
Feb. 27, 1990
Filed:
Dec. 14, 1987
Applicant:
Inventors:
Yutaka Hattori, Aichi, JP;
Yukimasa Yoshida, Nagoya, JP;
Assignee:
Brother Kogyo Kabushiki Kaisha, Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
369 14 ; 369110 ; 369 13 ; 360114 ;
Abstract
An information-reproducing system for reading information from a plurality of storage layers of an optical disk. The system includes a light source for irradiating the optical disk with a radiation, a first information-reproducing device for reading information from one of the plurality of storage layers, based on a change in an amount of the radiation reflected by the one storage layer, and a second information-reproducing device for reading information from another of the storage layers, based on a change in an angle of Kerr rotation of the radiation reflected by the above-indicated another storage layer.