Kanazawa University

Yoshio Ikehata

Toshiyuki Ueno

Sotoshi Yamada

Isamu Nagano

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.

Power generation switch

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.

Power generation element and power generation apparatus including the power generation element

Problems to be solved: to provide a coil device and a magnetic field generating device with reduced energy loss that are suitable for use in the thermotherapy method. Means for solving the problem: a coil device according to the present invention can be used in a magnetic field generating device for the thermotherapy method in which a magnetic flux is irradiated to the patient to selectively heat a specific portion of the patient. Said coil device is a bread-shaped coil device having a current path extending in the shape of a spiral in a substantially same plane, said current path comprising a hollow cylindrical member () of a nonmagnetic material inside which a space is formed and a plurality of conductive wires () covered with an insulation material on the peripheries thereof. In the present invention, the current path comprising a plurality of conductive wires covered with an insulation material which are arranged in a circle, energy loss caused by the skin effect and energy loss caused by the line capacity can be reduced, making it possible to generate a strong magnetic field. Also, by using the hollow cylindrical member (), it is possible to easily configure a current path in a predetermined diameter and to inhibit increase in temperature of the coil () to avoid fluctuation of the resonance frequency of the resonance circuit. With this, a magnetic field generating device that is suitable for use in thermotherapy, particularly cancer therapy, can be realized.

Growing community of inventors

Ishikawa, Japan

Yoshio Ikehata