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. 28, 1999
Filed:
May. 27, 1998
TDK Corporation, Tokyo, JP;
Abstract
The invention provides a method which can be performed on the same device with application of a modulated magnetic field to read a magneto-optical recording disk through a series of processes involving 'copy of recorded magnetic domains.fwdarw.enlargement of copied magnetic domains.fwdarw.reproduction of copied magnetic domains.fwdarw.size reduction and disappearance of copied magnetic domains', and to read an ordinary magneto-optical recording medium. For reading information recorded on the first magneto-optical recording disk, the first magneto-optical recording disk is irradiated with a laser beam having a first reading power, and the alternating magnetic field is then applied thereto after synchronization by which the alternating magnetic field is applied thereto at a recorded mark position. For reading information recorded on the second magneto-optical recording disk, the second magneto-optical recording disk is irradiated with a second laser beam.