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:
Mar. 08, 1994
Filed:
Oct. 19, 1992
Nikon Corporation, Tokyo, JP;
Abstract
A device comprises five wave guides and two interposed TE-TM mode splitters, formed on a substrate. A first mode splitter splits a first wave guide into second and third wave guides, and a second mode splitter splits a third wave guide into fourth and fifth wave guides. A light beam directed to the first wave guide through the second wave guide is radiated to a magneto-optical recording medium. A signal light beam carrying the information recorded on the medium, reflected by the medium, is directed to the third wave guide through the first mode splitter, and the polarization plane of the signal light beam is rotated by a polarization plane rotation device. The signal light beam is further split by the second mode splitter and directed to the fourth and fifth wave guides, thence to external detectors.