Patent ID: 9407172
Filing Date: 2016-08-02
CPC Classification: H02N

Claim Text:
1. A vibration power generator, comprising: a substrate having a surface; a vibration body having a surface opposed to the surface of the substrate, the vibration body being vibratable in a vibration direction with respect to the substrate; a plurality of electret electrodes aligned in the vibration direction on one of the surface of the substrate and the surface of the vibration body; and a plurality of first electrodes and a plurality of second electrodes alternately aligned in the vibration direction at an interval on the other of the surface of the substrate and the surface of the vibration body, wherein when the vibration body stops vibrating and is at a resting position with respect to the substrate, each of the plurality of electret electrodes overlaps with both of (i) a corresponding one of the plurality of first electrodes and (ii) a corresponding one of the plurality of second electrodes as viewed from a perpendicular direction to the surface of the substrate, while the vibration body vibrates with respect to the substrate, each of the plurality of electret electrodes always overlaps with at least one of (i) the corresponding one of the plurality of first electrodes and (ii) the corresponding one of the plurality of second electrodes as viewed from the perpendicular direction, when the vibration body stops vibrating and is at the resting position with respect to the substrate, a first width in the vibration direction of each of the plurality of first electrodes is wider than a first overlapping width, in the vibration direction, of each of the plurality of electret electrodes with the corresponding one of the plurality of first electrodes as viewed from the perpendicular direction, and when the vibration body stops vibrating and is at the resting position with respect to the substrate, the first width is wider than a sum of the first overlapping width and a second overlapping width, in the vibration direction, of each of the plurality of electret electrodes with the corresponding one of the plurality of second electrodes as viewed from the perpendicular direction.