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:
May. 22, 2001
Filed:
May. 19, 1998
Yasuo Nekado, Kanagawa, JP;
Masaaki Kusumi, Kanagawa, JP;
Sony Precision Technology, Inc., Tokyo, JP;
Abstract
A magnetic metal sensor having a high response speed and which can detect small-sized metal pieces and can elongate the separation from the metal pieces. A magnetic metal sensor,has a core,defining a substantially U-shaped open magnetic path and coils,of the same polarity mounted on the core,A uniform magnetic field along the direction of magnetic sensitivity is applied by a magnet,across the coils,If magnetic metal approaches to a open magnetic path portion of the core,of the magnetic metal sensor,the magnetic reluctance of the magnetic circuit formed by the core and air is changed, as a result of which the impedance of the cores,is changed. The magnetic metal sensor,detects the possible presence of magnetic metal or its displacement based on impedance changes of the paired coils