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:
Jun. 24, 1986
Filed:
Jul. 15, 1985
Yasuyuki Hirabayashi, Chiba, JP;
Hiroyuki Sono, Chiba, JP;
TDK Corporation, Tokyo, JP;
Abstract
A magnetic circuit device suitable for use in a magnetic catch having a switching function, a slide switch or a sensor for detecting locations of a movable member has been found. The magnetic circuit device comprises a main permanent magnet (1) having a pair of magnetic poles (N, S) on opposite faces, a pair of yoke pieces (2) lying on the faces, a movable piece (4) made of magnetic material capable of engaging with first ends of the yoke pieces (2), and a sub-permanent magnet (6) movably disposed near second ends of the yoke pieces (2) opposite to the first edges so that when the movable piece (4) is attracted to the first ends, the sub-permanent magnet (6) is attracted to the second ends, and when the movable piece (4) is made break away from the first ends, the sub-permanent magnet (6) breaks away from the second ends. Movement of the sub-magnet (6) can be utilized to control electrical connection of contacts (8A, 8B) of a switching mechanism.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile