Energy harvesting element and energy harvesting device

Patent metadata

Field	Value
Publication number	US-12395099-B2
Application number	US-202118267019-A
Country	US
Kind code	B2
Filing date	Oct 7, 2021
Priority date	Dec 17, 2020
Publication date	Aug 19, 2025
Grant date	Aug 19, 2025

Abstract

An energy harvesting element capable of efficiently generating power is provided. The energy harvesting element generates power by vibration, and includes a first electrode and a second electrode, a member having a third electrode electrically connected to the second electrode, and facing the first electrode, and a fourth electrode relatively fixed to the third electrode without being electrically connected to the third electrode, and electrically connected to the first electrode and facing the second electrode, the member being provided between the first electrode and the second electrode, and an electret provided in one of the first electrode and the third electrode, and one of the second electrode and the fourth electrode.

First claim

The invention claimed is:

1. An energy harvesting element that generates power by vibration, the energy harvesting element comprising:
a first electrode and a second electrode;
a member having a third electrode electrically connected to the second electrode, and facing the first electrode, and a fourth electrode relatively fixed to the third electrode without being electrically connected to the third electrode, and electrically connected to the first electrode and facing the second electrode, the member being provided between the first electrode and the second electrode; and
an electret provided in one of the first electrode and the third electrode, and one of the second electrode and the fourth electrode.

2. The energy harvesting element according to claim 1 ,
wherein the fourth electrode is fixed to the third electrode via an insulating part.

3. The energy harvesting element according to claim 1 ,
wherein the member is a movable part that is movable with respect to the first electrode and the second electrode.

4. The energy harvesting element according to claim 3 ,
wherein the movable part is vibrated between the first electrode and the second electrode when vibration is given from an outside, and
when the movable part is vibrated, power is generated by the first electrode and the third electrode, and power is generated by the second electrode and the fourth electrode.

5. An energy harvesting device, comprising:
the energy harvesting element according to claim 1 ; and
a rectifier having an electrode electrically connected to the first electrode and the fourth electrode, and an electrode electrically connected to the second electrode and the third electrode.

6. The energy harvesting device according to claim 5 ,
wherein the rectifier rectifies alternating current generated by the first electrode and the third electrode, and the second electrode and the fourth electrode.

7. The energy harvesting device according to claim 6 ,
wherein the rectifier is a diode.

8. An energy harvesting element that generates power by vibration, the energy harvesting element comprising:
a first electrode and a second electrode electrically connected to the first electrode;
a member having a third electrode facing the first electrode, and a fourth electrode relatively fixed to the third electrode, and electrically connected to the third electrode and facing the second electrode, the member being provided between the first electrode and the second electrode; and
an electret provided in one of the first electrode and the third electrode, and one of the second electrode and the fourth electrode
wherein the first electrode and the second electrode are both electrically connected to an external circuit via the same wire.

9. An energy harvesting device, comprising:
the energy harvesting element according to claim 8 ; and
a rectifier having an electrode electrically connected to the first electrode and the second electrode, and an electrode electrically connected to the third electrode and the fourth electrode.

Assignees

• Saginomiya Seisakusho Inc

Inventors

• Shimomura Noriko
• Ashizawa Hisayuki

Classifications

• H02N1/06 Primary

  Influence generators · CPC title

• H02N1/08 Primary

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