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. 15, 1994
Filed:
Jul. 21, 1993
Makoto Onisawa, Hitachi, JP;
Ken Yoshioka, Hitachiohta, JP;
Makoto Koizumi, Ibaraki, JP;
Hiromitsu Nagae, Katsuta, JP;
Ryoichi Koshida, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A small, light and low cost ignition distributor having improved rotary detection accuracy can be realized. A pole piece having a pickup coil wound on it and bypass pole pieces having no pickup coil are arranged on the ignition distributor. The distance between the pole piece having a pickup coil and the bypass pole pieces is about 1.5 times as long as the distance between protrusions formed on the peripheral portion of a rotary body. When the distance between the pole piece having a pickup coil and a reluctor is minimum, the distance between the bypass pole pieces and the reluctor is maximum, and the linkage of magnetic flux of the pickup coil is maximum. When the distance between the pole piece having a pickup coil and the reluctor is maximum, the distance between the bypass pole pieces and the reluctor is minimum, and the magnetic flux bypasses the pole piece having a pickup coil and passes through the bypass pole pieces. Accordingly, the change of the magnetic flux passing through the pickup coil can be made to be large, and the change of the generated voltage can be made to be larger so that the rotary detection accuracy is improved.