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:
Feb. 05, 1991
Filed:
Jun. 09, 1989
Shinji Ooyabu, Obu, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
In an ignition coil in which an air gap portion is provided at a portion of an iron core forming a closed magnetic circuit, which includes an exciting part iron core having a primary coil and a secondary coil wound therearound, and a strong permanent magnet is inserted in the air gap portion, the closed magnetic circuit is constructed to have the iron core and permanent magnet provided with respective suitable shapes, dimensions, properties, etc. so as to make most of the characteristics of the strong permanent magnet, thereby drastically reducing the size and weight of the ignition coil. Further, a concrete improvement of the construction of the closed magnetic circuit of the ignition coil is attained to assure excellent magnetoelectric conversion performance of the ignition coil.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile