Abstract: A power generation switch includes: parallel beams including at least one magnetostrictive rod made of a beam-shaped magnetostrictive material; a coil wound around the rod; a first connecting part connecting two beams in the parallel beams together, at first ends of the parallel beams; a second connecting part connecting the two beams together at second ends of the parallel beams; a field part that produces magnetic flux to pass through the two beams in the same direction; and an operating part operable by a user. The first connecting part is a non-displaced fixed end. The second connecting part is a free end for free oscillation. The operating part applies external force to the second connecting part to cause free oscillation of the parallel beams, thereby causing a positive axial force in one of the two beams and a negative axial force in the other one of the two beams.

Abstract: A power generation element includes: a first nnagnetostrictive rod made of a nnagnetostrictive material; a rigid rod made of a magnetic material and disposed in parallel with the first nnagnetostrictive rod, the magnetic material having rigidity and a shape that enable uniform application of a compression or tensile force to the first nnagnetostrictive rod; a first coil wound around the first nnagnetostrictive rod; and two connecting yokes, each of which is provided at one end of each of the first nnagnetostrictive rod and the rigid rod to connect the first nnagnetostrictive rod and the rigid rod; wherein the power generation element generates power through expansion or contraction of the first nnagnetostrictive rod due to vibration in a direction perpendicular to a longitudinal axis of the first nnagnetostrictive rod.

Abstract: A power generation switch includes: parallel beams including at least one magnetostrictive rod made of a beam-shaped magnetostrictive material; a coil wound around the rod; a first connecting part connecting two beams in the parallel beams together, at first ends of the parallel beams; a second connecting part connecting the two beams together at second ends of the parallel beams; a field part that produces magnetic flux to pass through the two beams in the same direction; and an operating part operable by a user. The first connecting part is a non-displaced fixed end. The second connecting part is a free end for free oscillation. The operating part applies external force to the second connecting part to cause free oscillation of the parallel beams, thereby causing a positive axial force in one of the two beams and a negative axial force in the other one of the two beams.

Abstract: An eddy-current sensor for nondestructive testing according to the present invention includes a planar exciting coil having a pair of current lines in parallel with each other through which exciting currents flow in opposite directions to each other during the testing, for generating an alternative magnetic field applied to a subject to be nondestructively tested by the exciting currents, and at least one MR element positioned on a central axis between the pair of current lines and on the opposite side to the subject in relation to the exciting coil, for detecting a magnetic field generated newly from the subject by an eddy-current induced by the alternative magnetic field.

Abstract: An eddy-current sensor for nondestructive testing according to the present invention includes a planar exciting coil having a pair of current lines in parallel with each other through which exciting currents flow in opposite directions to each other during the testing, for generating an alternative magnetic field applied to a subject to be nondestructively tested by the exciting currents, and at least one MR element positioned on a central axis between the pair of current lines and on the opposite side to the subject in relation to the exciting coil, for detecting a magnetic field generated newly from the subject by an eddy-current induced by the alternative magnetic field.

Abstract: A magnetic frequency triplo-multiplier for use as a power source for metal melting furnaces and the like. The frequency triplo-multiplier has Y-connected primary windings that are resonant with each phase of a three-phase alternating-current power source and serially-connected secondary windings that are resonant with a triple frequency so as to produce a large single-phase power. The frequency triplo-multiplier uses a five-legged iron core, and capacitors connected in parallel with first, third and fifth leg windings of the five-legged iron core to bring about resonance with the three-phase alternating-current power source, while second and fourth leg windings of the five-legged iron core are connected in series and shunted by a capacitor so as to bring about resonance with a triple frequency.

Abstract: The disclosed strong magnetic field generator has a number of concentric conductor circular plates, central portions thereof being unified, each of which plates has a radial slit so as to have open sidewalls. Exciting coils are mounted between each of the concentric circular plates respectively, so as to induce an eddy current in each of the conductor circular plates in a peripheral direction. A conductor circular plate forming the unified central portions of the concentric circular plates has a central hole and a radial slit extending from the central hole to each of the slits of the concentric circular plates and connected with each other at a periphery thereof, while the central hole is placed at the center of all of the concentric circular plates and while all of the radial slits are aligned in a longitudinal direction.

Abstract: The disclosed strong magnetic field generator has a number of concentric conductor cylinders, each of which has a longitudinal slit so as to have an open sidewall. Exciting coils are mounted on the cylinders to induce an eddy current in each cylinder in a circumferential direction. A conductor plate with a central hole and a radial slit extending from the central hole to an open end at its periphery is connected to the concentric cylinders while placing the central hole at the center of all the cylinders and while aligning the longitudinal slits of all the cylinders with each other along the radial slit. Thus, the path of eddy current in each cylinder is closed through sidewall portions of the radial slit and the central hole, and the eddy currents of all the cylinders are superposed at the sidewall portion of the central hole for generating a very strong magnetic field there.