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, 2002
Filed:
Feb. 08, 2000
Hitachi, Ltd., Tokyo, JP;
Abstract
In an independent ignition type ignition coil for an internal combustion engine which is used being directly coupled to a corresponding ignition plug, a center core , a secondary coil wound around a secondary coil bobbin and a primary coil wound around a primary coil bobbin are arranged concentrically in a coil casing in this order from the inside thereof and such as epoxy resin and soft epoxy are filled between these constituting members, wherein on the outer surface of the primary coil a cover film which promotes peeling off thereof from the epoxy resin is formed, and because of existence of these peeling off portions between the primary coil and the epoxy resin and between the layers of the primary coil , a stress component induced inside the secondary coil bobbin due to heat contraction difference between the primary coil and the secondary coil bobbin among thermal stress induced inside the secondary coil bobbin is reduced.