抄録
When charged bodies such as a human body and a tool wagon etc. move near an electronic equipment of a partially opened metal box, an electrostatically induced voltage appears in the metal box. The induced voltage causes a breakdown of a device or a malfunction of the equipment. In this study, the author measured the induced voltage in the box using a sphere gap and an electromagnetic wave sensor. This paper presents that the author measures the induced voltage with changing the area of two metal foils in the box. As the results, the author clears that the induced voltage increases up to 1.6 times when the area of induction electrode is 10 times (100cm2) larger than that of 10cm2, and the induced voltage doesn't change so far as the area of an ungrounded metal foil is not changed. The fruit will be useful for designing the printed circuit board as a basic study for preventing the malfunction or the failure of the electronic equipment of the partially opened metal box.
