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:
May. 07, 2024
Filed:
Mar. 08, 2019
National University Corporation Kanazawa University, Ishikawa, JP;
Toshiyuki Ueno, Ishikawa, JP;
Tamotsu Minamitani, Ishikawa, JP;
NATIONAL UNIVERSITY CORPORATION KANAZAWA UNIVERSITY, Ishikawa, JP;
Abstract
A power generation element and an actuator for vibration power generation is provided that can be mass-produced at low cost while achieving increase in electromotive force. A power generation element includes a main series magnetic circuit having a frame yoke made of magnetic material and provided with a fixed portion that is one end and a free portion that is the other end across a U-shaped bent portion, a main magnet that applies a magnetic bias to the frame yoke, and a first gap formed at a position in contact with the free portion; and an auxiliary series magnetic circuit having an auxiliary yoke made of magnetic material and attached to the frame yoke, an auxiliary magnet that gives a magnetic bias to the auxiliary yoke, a second gap formed at a position facing the first gap across the free portion, the frame yoke, the main magnet, and the first gap. The amount of change in a main magnetic flux passing in a coil wound around the frame yoke increases when the free portion vibrates due to application of an external force and a magnetic resistance of the first gap and a magnetic resistance of the second gap increase or decrease reciprocally.