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:
Nov. 19, 2002
Filed:
Nov. 16, 2000
Kenichiro Mitani, Gifu, JP;
Naoyuki Takagi, Gifu, JP;
Hitoshi Noguchi, Gifu, JP;
Hiroki Ishida, Gifu, JP;
Atsushi Yamaguchi, Gifu, JP;
Morio Nakatani, Gifu, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
A magnetic head is configured of a core and a coil wound around the core and passing current through the coil in a variable direction allows the core to have an edge generating an alternating magnetic field Hex and another edge generating an alternating magnetic field Hex . Alternating magnetic fields Hex and Hex are applied to the respective edges. Furthermore, a laser beam LB is directed such that its optical axis L matches the edge receiving the alternating magnetic field Hex , and a laser beam LB is directed such that its optical axis L matches the edge receiving the alternating magnetic field Hex . A first magneto-optical signal detected through the alternating magnetic field Hex and the laser beam LB and a second magneto-optical signal detected through the alternating magnetic field Hex and the laser beam LB are composited together. As such, an alternating magnetic field can be applied to a magneto-optical recording medium at a predetermined angle to an in-plane direction of the recording medium to accurately enlarge a magnetic domains for reproduction.