Sendai Smart Machines Co., Ltd.

Hiroyuki Oguchi

Hiroki Kuwano

Haruhiko Asanuma

Motoaki Hara

An electrostatic induction-type vibration power generation device and method for improving a power generation amount, and extracting an external electric field from a spontaneous polarization electret. A pair of conductive plates is disposed with a gap therebetween. A charged body formed of a spontaneous polarization electret having predetermined thickness has a positively charged lower surface and negatively charged upper surface. The charged body is between conductive plates in contact with one conductive plate. The gap between the conductive plates is displaced in a direction vertical to the surfaces of the spontaneous polarization electret, whereby an electrostatic capacitance changes and electric power is generated. The other conductive plate is disposed at a position where an absolute value of an external electric field emitted outside from the charged body is between 2.7&#xd7;10V/m and 1.5&#xd7;10V/m. Moreover, the thickness of the spontaneous polarization electret is between 1 mm and 60 mm.

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Sendai, Japan

Hiroyuki Oguchi