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. 23, 2025
Filed:
Jun. 02, 2021
Nippon Electric Glass Co., Ltd., Otsu, JP;
Futoshi Suzuki, Otsu, JP;
NIPPON ELECTRIC GLASS CO., LTD., Shiga, JP;
Abstract
Provided is a magnetic circuit which, with the use in an optical isolator, is less likely to cause the polarizer to be damaged even with higher laser output power. A magnetic circuitincludes first to third magnetstoeach provided with a through hole allowing light to pass through and is composed of the first to third magnetstoarranged coaxially in this order in a front-to-rear direction, wherein one of the first and third magnetsandis magnetized in a direction Y perpendicular to a direction X of an optical axis to have a north pole located toward the through hole, the other of the first and third magnetsandis magnetized in a direction Y perpendicular to the direction X of the optical axis to have a south pole located toward the through hole, the second magnetis magnetized in a direction parallel to the direction X of the optical axis to have a north pole located toward the one of the first and third magnetsandhaving the north pole located toward the through hole, and a length L1 of the first magnetalong the direction X of the optical axis is different from a length L3 of the third magnetalong the direction X of the optical axis.