专利名称：HELMHOLTZ COIL 发明人：TAKANO ICHIROU 申请号：JP9218381
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外面申请日：19810617are you nuts>美国就业
公开号：JPS57207306A
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19821220japane granny
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摘要：PURPOSE:To impart excellent performance in magnetic field uniformity to a coil system, by constituting two circular coils having a fan shaped cross ction. CONSTITUTION:The circular coils 3 and 4, which have the fan shaped cross ction, face each other. The directions of currents are the same. It is natural to describe the coil system having said cross ction by polar coordinates. Their magnetic fields are expanded by r<2n> (wherein r is the distance between an obrving point P and an original point O, and n is an integer) and a Legendre's function. Since the expansion equation and the coordinate system which describes the coil shape are the same, the magnetic uniformity is improved in a spherical space having a constant radius. Furthermore the volume occupied by the coil system is reduced.
申请人：TOKYO SHIBAURA DENKI KK
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