PROBLEM TO BE SOLVED: To inhibit a deterioration of an electrical characteristic of an insulative liquid used by generating a liquid jet having a high directivity even to the insulative liquid having a constant temperature thermally insulated and accompanying with no charge pouring from the electrode to the insulative liquid regarding the case where the liquid jet is generated by EHD pumping.;SOLUTION: One end of a suspected donut-like electrode in which a liquid circulation hole is penetrated to a direction of a center axis and of which both end surfaces are molded to an arc-like shape is opposed to a flat plate electrode at an interval to constitute an electrode system. This electrode system is placed in an insulative liquid and a liquid jet of the insulative liquid is injected from an end surface of the suspected donut-like electrode through the liquid circulation hole of the suspected donut-like electrode by applying a D.C. high voltage to a space between the suspected donut-like electrode and the flat plate electrode.;COPYRIGHT: (C)2002,JPO
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