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:
Apr. 02, 1991
Filed:
Nov. 09, 1989
Toru Hashimoto, Kyoto, JP;
Masato Takabatake, Kyoto, JP;
Masashi Chino, Kyoto, JP;
Akira Takahashi, Kyoto, JP;
Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A sensor for detecting a number of revolutions of a rotary shaft is provided which comprises a ring magnet secured to the outer peripheral surface of the rotary shaft, the number of revolutions of which is to be detected, a Hall IC arranged near the outer peripheral surface of the rotary shaft, for detecting the magnetism of the ring magnet. The ring magnet has one circumferential half of the outer peripheral surface thereof magnetized to serve as the north pole and the other circumferential half of the outer peripheral surface thereof magnetized to serve as the south pole.