2次元問題で提案されている双対影像法による開領域とケルビン変換の類似性に注目し，軸対称3次元の開領域の一般化を試みた。楕円座標のラプラス方程式の特性を調べることで，軸対象3次元問題に楕円境界条件に求められる条件を求めた。椅円境界と対影像法，およびケルビン変換(周期境界条件法)に共通な要求を明確にした。%In early 1990's, the strategic dual image method for three-dimensional axisymmetric open boundary magnetic field problems were proposed. Although the method was powerful, the specific axis ratio of the ellipsoidal boundary has not been clarified and therefore unuttered. We have investigated the harmonic solutions of the Laplace equation in oblate spheroidal coordinate thus to determine the explicit formula regarding to the axis ratio and the averaging factor. Finally we have extended the strategic dual image method in general form.
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