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. 20, 1994
Filed:
Jan. 16, 1992
Applicant:
Inventors:
Yasuaki Morimoto, Sakurashi, JP;
Friedhelm Zucker, Monchweiler, DE;
Assignee:
Deutsche Thomson-Brandt GmbH, Villengen-Schwenningen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 4437 ; 369 4428 ; 369 4441 ; 369116 ; 369112 ;
Abstract
The two sets of data stored in pits and a magneto-optical layer of an optical recording/reproducing device can be read separately by the use of two lasers. The laser which reads/records the data stored in the pits operates at a wavelength .lambda..sub.1 approximately four times the depth of the pits. The laser which reads/records the data stored in the magneto-optical layer operates at a wavelength .lambda..sub.2 approximately twice the depth of the pits. The wavelength of the laser which reads the magneto-optical layer is adjusted and interference between the two signals is avoided.