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:
Nov. 16, 1999
Filed:
May. 27, 1997
Hikaru Kikuta, Takahama, JP;
Katsuo Yoshihara, Kariya, JP;
Aisan Kogyo Kabushiki Kaisha, Obu, JP;
Miyama-Seiko Manufacturing Co., Ltd., Chiryu, JP;
Abstract
The invention is directed to an ignition coil for an internal combustion engine which includes a columnar member having a plurality of magnetic plates, e.g., silicon steel plates stacked one on the other with stacked portions formed on the magnetic plates. The magnetic columnar member includes a first portion having a plurality of magnetic plates stacked one on the other in accordance with increase of a width of each plate, a second portion connected to the first portion and having a plurality of magnetic plates with the same width stacked stacked one on the other, and a third portion connected to the second portion and having a plurality of magnetic plates stacked one on the other in accordance with decrease of a width of each plate, thereby to form the columnar member with a middle portion thereof having a substantially circular cross section. The ignition coil further includes a primary winding and a secondary winding which are wound around the columnar member, a magnetic cylindrical member in which the columnar member is received. A plurality of rectangular recesses are formed on one side of each magnetic plate, and a plurality of rectangular protrusions are formed on the other side of each magnetic plate, to form a plurality of rectangular stacked portions on the columnar member.