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:
Aug. 08, 2000
Filed:
Aug. 05, 1998
Katsusuke Shimazaki, Kitasoma-gun, JP;
Masafumi Yoshihiro, Kitasoma-gun, JP;
Akito Sakemoto, Tsukuba-gun, JP;
Norio Ohta, Tsukuba-gun, JP;
Osamu Ishizaki, Makabe-gun, JP;
Satoru Ohnuki, Kitasoma-gun, JP;
Toshinori Sugiyama, Tsukuba, JP;
Kazuko Ishitsuka, Iwai, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
An optomagnetic recording and reproducing system has been developed which demonstrates superior performance when used with multilayer recording substrates. The system features an optical head and magnetic head disposed opposite to each other on different sides of the recording substrate. The novel magnetic head can either incorporate a number of independently driven subheads, or alternately it can be constructed by placing multiple independently driven windings on a single head. Biasing of the magnetic head can either be performed externally using an external magnet or by providing a bias with one of the windings or sub-heads. The resulting optomagnetic recording and reproducing system is suitable for multi-valued recording of an optomagnetic recording medium.