Pulse generating element and a method and an apparatus for manufacturing the same
AssigneeNHK Spring Co., Ltd.
InventorsTatsuya Kurihara, Itsuo Takeuchi, Tsukasa Higashi, Hajime Arai
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Abstract
A pulse generating element formed of a switchable magnetic wire is worked so as to have an arcuate shape such that the ratio R/d between the radius of curvature R and diameter d of the wire in a state free from external force ranges from 65 to 95. This is achieved by subjecting a wire of a ferromagnetic material, such as Fe--Co--V, to drawing-bending work. The pulse generating element, which is obtained by cutting the switchable magnetic wire to a predetermined length, is restricted to a substantially straight state by a retaining member, and undergoes a drastic flux reversal when it is subjected to an alternating field.
Claims10
A pulse generating element comprising:
- a switchable magnetic wire formed of a ferromagnetic material and having a Large Barkhausen effect such that a flux reversal is caused when subjected to an alternating field,
- the switchable magnetic wire being in the form of a circular arc and having an R/d ratio from 65 to 95 when in a state free from external force, where R is a radius of curvature of the wire and d is a diameter thereof.
A pulse generating element comprising:
- a switchable magnetic wire formed of a ferromagnetic material and having a Large Barkhausen effect such that a flux reversal is caused when subjected to an alternating field,
- the switchable magnetic wire being in the form of a circular arc and having an R/d ratio from 65 to 95 when in a state free from external force, where R is a radius of curvature of the wire and d is a diameter thereof, and
- retaining means for restricting said switchable magnetic wire to a substantially straight state.
A pulse generating element according to claim 8, wherein said retaining means is a nonmagnetic member made of resin in which said switchable magnetic wire is embedded.
A pulse generating element comprising a substantially straightened ferromagnetic wire, said wire having an arcuate shape when in a state free from external force, wherein the wire is one which has not been subjected to substantial torsional straining.
Dependencies are inferred from the claim text.