Hitachi Metals, Ltd.

Eiji Sugiyama

Masaaki Aoki

Eiji Nakamura

Masaaki Aoiki

Kaichi Murakami

Ken Makita

Tadamichi Kawakubo

A coil device () in which a first coil (), a second coil () and a third coil (), each having a flat plate shape, are stacked with one other, wherein the first coil has a clearance section, the third coil has a second clearance section, part or whole of a lead wire () drawn out from the inside to the peripheral portion of the second coil while striding over the second coil () as well as part or whole of a lead wires () drawn out from the inside to the peripheral portion of the third coil () while striding over the third coil are accommodated in the clearance section, and part or whole of lead wires () drawn out from the inside to the peripheral portion of the first coil () while striding over the first coil are accommodated in the second clearance section.

Coil device and magnetic resonance imaging apparatus

A magnetic circuit that forms an arc-shaped magnetic field space is provided. Of two magnets constituting a first magnetic circuit, a first magnetic poleis provided with a first yokethat is arc-shaped in planar view, a first magnetthat is arc-shaped in planar view and a magnetic pole piece. On the other hand, a second magnetic poleis provided with a second yokethat is arc-shaped in planar view, a second magnetthat is arc-shaped in planar view and a magnetic pole piece. The first magnetic pole pieceand the second magnetic pole pieceare disposed so as to be opposed to each other while being separated from each other. The first magnetand the second magnetare formed by arranging a plurality of small magnets.

Magnetic circuit for magnetic field generator

A permanent magnet for a particle accelerator and a magnetic field generator, in which Nd&#x2014;Fe&#x2014;B based magnets are used but are not demagnetized so easily even when exposed to a radiation, are provided. A permanent magnet for a particle accelerator is used in an environment in which the magnet is exposed to a radiation at an absorbed dose of at least 3,000 Gy. The magnet includes R (which is at least one of the rare-earth elements), B, TM (which is at least one transition element and includes Fe) and inevitably contained impurity elements. The magnet is a sintered magnet that has been magnetized to a permeance coefficient of 0.5 or more and that has a coercivity Hof 1.6 MA/m or more.

Growing community of inventors

Takasaki, Japan

Eiji Sugiyama