Electrostatic induction-type vibration power generation device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016285391-A1
Application number	US-201414777779-A
Country	US
Kind code	A1
Filing date	Mar 14, 2014
Priority date	Mar 19, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

An electrostatic induction-type vibration power generation device for improving a power generation amount, and extracting an external electric field from a spontaneous polarization electret and method of manufacturing the same. 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 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. An absolute value of an external electric field generated by the spontaneous polarization electret is between 2.7×10 7 V/m and 1.5×10 10 V/m at a position where the other conductive plate is present. Moreover, the thickness of the spontaneous polarization electret is between 1 mm and 60 mm.

First claim

1 . An electrostatic induction-type vibration power generation device comprising:
a pair of conductive plates disposed with a gap therebetween, containing a conductive material; a charged body which has a predetermined thickness, of which one surface is positively charged and the other surface is negatively charged, and which is provided between the conductive plates in contact with one of the conductive plates, wherein the gap between the conductive plates is displaced in a direction vertical to the surfaces of the charged body, whereby an electrostatic capacitance changes and electric power is generated, the thickness of the charged body is between 1 mm and 60 mm, the charged body is formed of a spontaneously polarized electret, and an absolute value of an external electric field generated when the charged body is present solely in the air is between 2.7×10 7 V/m and 1.5×10 10 V/m at a position where the other conductive plate is present.

2 . (canceled)

3 . (canceled)

4 . The electrostatic induction-type vibration power generation device according to claim 1 , wherein
the charged body is formed by stacking a plurality of spontaneously polarized electrets having a predetermined thickness.

5 . The electrostatic induction-type vibration power generation device according to claim 1 , wherein
the charged body is formed of ferroelectric, pyroelectric, or piezoelectric material.

6 . The electrostatic induction-type vibration power generation device according to claim 1 , wherein
the charged body is configured to induce surface charges upon receiving compressive or tensile stress.

7 . The electrostatic induction-type vibration power generation device according to claim 1 , wherein
a conductive layer containing a conductive material is formed in a portion of one surface of the charged body and/or a portion of the other surface of the charged body.

8 . A method of manufacturing the electrostatic induction-type vibration power generation device according to claim 1 , comprising:
attaching a conductive member to a partial portion or an entire portion of each surface of a spontaneous polarization member having a predetermined thickness; applying an electric field to the spontaneous polarization member via the conductive members to perform a polarization process; and removing the conductive members to obtain the charged body or the spontaneously polarized electret.

9 . The method of manufacturing the electrostatic induction-type vibration power generation device according to claim 7 , comprising:
forming the conductive layer on a portion of each surface of a spontaneous polarization member having a predetermined thickness; and applying an electric field to the spontaneous polarization member via the conductive layers to perform a polarization process to obtain the charged body.

Assignees

• Univ Tohoku

Inventors

• Asanuma Haruhiko
• Oguchi Hiroyuki
• Hara Motoaki
• Kuwano Hiroki

Classifications

• H01L41/22

  Electricity · mapped topic

• H01L37/02

  Electricity · mapped topic

• H02N1/08 Primary

  with conductive charge carrier, i.e. capacitor machines · CPC title

• H02N2/18

  producing electrical output from mechanical input, e.g. generators (for measurement devices G01) · CPC title

• H10N15/10

  Thermoelectric devices using thermal change of the dielectric constant, e.g. working above and below the Curie point · CPC title