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:
Dec. 27, 1988
Filed:
Nov. 04, 1987
Shigeru Mano, Kakamigahara, JP;
Hiroshi Kagohashi, Kasugai, JP;
C K D Kabushiki Kaisha, Aichi, JP;
Abstract
In a piston position detector for a fluid pressure cylinder operating by fluid pressure such as air pressure or oil pressure, a permanent magnet is mounted on a piston sliding in a non-magnetic cylinder, and a magnetic detection element to respond to the magnetic field formed by the permenent magnet and to generate detection signals is mounted to any position of the cylinder. A magnetic induction piece in sheet form is interposed between the cylinder and the magnetic detection element, so that when the permanent magnet faces the front of the magnetic detection element, the magnetic induction piece is magnetically saturated by performing bypass induction of only a part of the magnetic flux of the permanent magnet to act on the magnetic detection element and most of the magnetic flux acts on the magnetic detection element. As the permanent magnet is shifted from the front of the magnetic detection element, the ratio of the magnetic flux subjected to the bypass induction through the magnetic induction piece is increased and the magnetic flux density acting on the magnetic detection element is rapidly decreased, thereby the piston position can be detected with precise accuracy.