The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 1990
Filed:
Aug. 17, 1988
Michiru Fujita, Kawasaki, JP;
Masao Higuchi, Kawasaki, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
A high frequency coil is constructed by combining a plurality of unit coil having two saddle shaped coils which are vertically symmetric to each other. Each unit coil is disposed so as to locate the line sections of each saddle shaped coil on an outer peripheral surface of an elliptic cylinder. Assuming the plane perpendicular to the central axis of the elliptic cylinder is an x-y plane, major axis of an ellipse on the x-y plane as x axis and minor axis thereof as y axis, the angle between the x axis and the line extending from origin to the line section located in a first quadrant chosen among the line sections of each unit coil is assumed as .theta.. The optimum angle .theta..sub.op is determined in such a way that when power series expansion relative to y over the magnetic flux density distribution on the y axis of the magnetic flux generated by the high frequency coil is performed, the angle at which the coefficient of the terms with up to degrees of 2N or 2N-2, N is a number of the unit coil, become zero. It is possible to obtain a high frequency magnetic field having exactly uniform magnetic flux density by means of directing .theta. to .theta..sub.op or near by .theta..sub.op.