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:
Mar. 23, 1999
Filed:
Dec. 27, 1996
Sumitomo Special Metals Co., Ltd., Osaka, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A displacement detection device and a wire therefor in which the drawbacks of the conventional Elinvar-type alloy are eliminated, the magnetostriction intensity as well as the magnetostriction propagation speed does not vary with temperature, and a magnetostriction coefficient is sufficiently great to enable an amplification at a high speed of response to be unnecessary. A magnetostrictive wire used in a displacement detection device together with a magnetostriction-generating magnet disposed close thereto and movable relative thereto, said wire substantially composed of 35 to 60 wt % Ni and the balance consisting of Fe and unavoidable impurities, cold-wire-drawn and then heat-treated and having a magnetostriction coefficient greater than that exhibited in an as-cold-wire-drawn state. A displacement detection device includes the above-mentioned magnetostrictive wire and a magnetostrictive-generating magnet disposed movable relative thereto and therealong for detecting a relative displacement between the magnetostrictive wire and the magnet based on a time of propagation, through the wire, of a magnetostriction signal generated in the wire in the portion close to the magnet by a pulse current applied to the wire.