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. 04, 1998
Filed:
Sep. 26, 1997
Toshiyuki Kase, Tokyo, JP;
Hiroshi Nishikawa, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A laser beam emitted from a laser diode passes through a polarizing separating plane of a first polarization beam splitter and forms a beam spot on a magneto-optic disk. The plane of polarization of the laser beam that is reflected at a magnetic film provided on the magneto-optic disk is rotated by the Kerr effect in a fixed direction depending on the direction of magnetization of the magnetic film. The reflected laser beam is made incident on the polarizing separating plane of the first polarization beam splitter. The angle of the polarizing separating plane of the first polarization beam splitter is adjusted with respect to an optic path of the laser beam so that the P polarization component of the laser beam is reflected by 20%.