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:
Sep. 19, 2006
Filed:
Apr. 01, 2003
Minoru Tobita, Tokyo, JP;
Yoshiyuki Teraoka, Kanagawa, JP;
Tomiji Tanaka, Miyagi, JP;
Masato Hattori, Kanagawa, JP;
Tamotsu Ishii, Chiba, JP;
Minoru Tobita, Tokyo, JP;
Yoshiyuki Teraoka, Kanagawa, JP;
Tomiji Tanaka, Miyagi, JP;
Masato Hattori, Kanagawa, JP;
Tamotsu Ishii, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
An information recording/reproducing apparatus for recording and reproducing information to and from a magneto-optical storage medium that includes a first magnetic layer for recording at least information, a second magnetic layer for regulating a switched connective force, and a third magnetic layer for shifting a magnetic wall of recorded markings for information reproduction. The three layers being stacked on a transparent substrate to make up the storage medium. The information recording/reproducing apparatus includes an optical head and a magnetic head. The optical head has a light source and an objective lens, the light source is configured to emit at least a laser beam with a wavelength of about 780 nm, the objective lens having a numerical aperture of about 0.45 and is configured to focus the laser beam from the light source into a beam spot for emission onto the magneto-optical storage medium. The magnetic head is for applying a recording magnetic field to the magneto-optical storage medium.