| 摘要 |
A pulse generating element (11) formed of a switchable magnetic wire (11b) 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 (11a) 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 (11), which is obtained by cutting the switchable magnetic wire (11b) to a predetermined length, is restricted to a substantially straight state by means of a retaining member, and undergoes a drastic flux reversal when it is subjected to an alternating field. An apparatus for manufacturing the pulse generating element (11) comprises means for supplying the wire, take-up means for winding up the wire while applying a tension to the wire, and a die for bending the wire by coming sideways into contact with the wire. The die subjects the wire to drawing-bending work such that the ratio between the radius of curvature R and diameter d of the wire in a free state is within the aforesaid range. <IMAGE> |
