Power generating element

A power generating element which converts vibration energy in at least one coordinate direction of an XYZ three-dimensional coordinate system into electric energy to generate electric power,

• the power generating element comprising:
• a flexible plate-like bridge portion which extends along a longitudinal direction axis parallel to a Y-axis;
• a weight body which is directly connected to the plate-like bridge portion;
• a device housing which houses the plate-like bridge portion and the weight body;
• a fixing-portion which fixes an end of the plate-like bridge portion to the device housing;
• a lower layer electrode which is layered on a surface of the plate-like bridge portion;
• a piezoelectric element which is layered on a surface of the lower layer electrode;
• a plurality of upper layer electrodes which are formed locally on a surface of the piezoelectric element;
• and
• a power generating circuit which rectifies current produced on the basis of charge generated at the upper layer electrodes and the lower layer electrode to take out electric power, wherein
• the fixing-portion fixes a base end of the plate-like bridge portion to the device housing, a leading end of the plate-like bridge portion is directly connected to the weight body,
• the weight body is constituted so as to vibrate inside the device housing due to deflection of the plate-like bridge portion, when there is applied an external force which causes the device housing to vibrate,
• the piezoelectric element is apt to polarize in a thickness direction due to application of stress which expands or contracts in a layer direction,
• the plurality of upper layer electrodes include a leading end-side electrode arranged in a vicinity of the leading end of the plate-like bridge portion and a base end-side electrode arranged in a vicinity of the base end of the plate-like bridge portion.

A power generating element which converts vibration energy in at least one coordinate direction of an XYZ three-dimensional coordinate system into electric energy to generate electric power,

• the power generating element comprising:
• a flexible plate-like bridge portion which extends along a longitudinal direction axis parallel to a Y-axis;
• a weight body which is indirectly connected to the plate-like bridge portion;
• a device housing which houses the plate-like bridge portion and the weight body;
• a fixing-portion which fixes an end of the plate-like bridge portion to the device housing;
• a lower layer electrode which is layered on a surface of the plate-like bridge portion;
• a piezoelectric element which is layered on a surface of the lower layer electrode;
• a plurality of upper layer electrodes which are formed locally on a surface of the piezoelectric element;
• and
• a power generating circuit which rectifies current produced on the basis of charge generated at the upper layer electrodes and the lower layer electrode to take out electric power;
• wherein
• the fixing-portion fixes a base end of the plate-like bridge portion to the device housing, a leading end of the plate-like bridge portion is indirectly connected to the weight body,
• the weight body is constituted so as to vibrate inside the device housing due to deflection of the plate-like bridge portion, when there is applied an external force which causes the device housing to vibrate,
• the piezoelectric element is apt to polarize in a thickness direction due to application of stress which expands or contracts in a layer direction,
• the plurality of upper layer electrodes include a leading end-side electrode arranged in a vicinity of the leading end of the plate-like bridge portion and a base end-side electrode arranged in a vicinity of the base end of the plate-like bridge portion.