# US 12,119,184 B2 · Power generator

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- Number: US 12,119,184 B2
- Document ID: US12119184B2
- Status: Granted
- Kind: B2
- Application number: 17/886,538
- Filed: 2022-08-12
- Published: 2022-12-08
- Granted: 2024-10-15
- Earliest claimed: 2020-02-28
- Assignees: Denso Corporation; Tokyo University of Science Foundation
- Applicants: Denso Corporation; Tokyo University of Science Foundation
- Inventors: Yoshihiro Kozawa; Noriyuki Matsushita; Kazuhiko Kano; Yumi Tanaka; Hiroki Otsuka; Yusuke Edano
- Web page: https://patentgrep.com/patent/US12119184B2

## CPC

- H01G 7/025: {having an inorganic dielectric}
- C04B 35/50: based on rare-earth compounds {(non-oxide rare earth compounds C04B35/5156)}
- H01G 7/02: Electrets, i.e. having a permanently-polarised dielectric
- H02N 1/08: with conductive charge carrier, i.e. capacitor machines
- H10N 30/30: with mechanical input and electrical output, e.g. functioning as generators or sensors
- H10N 30/853: Ceramic compositions
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- H02N: ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

A power generator includes an electret including a first charged surface and a second charged surface having opposite polarities, a first electrode partially formed on the first charged surface, a second electrode formed on the second charged surface, a third electrode disposed to face the first charged surface with a space, and at least one of a power storage unit or an output unit. The first charged surface has a current collecting surface that is exposed outward. The first electrode and the second electrode form a first power generating unit and the third electrode and the second electrode form a second power generating unit. The electret is formed by polarizing an electret material that includes an inorganic dielectric having a bandgap energy of 4 eV or more.

## Claims

### Claim 1

A power generator comprising:
an electret including a first charged surface and a second charged surface, the first and second charged surfaces having opposite polarities,
a first electrode partially formed on the first charged surface such that the first charged surface has a portion as a current collecting surface that is exposed outward,
a second electrode formed on the second charged surface,
a third electrode disposed to face the first charged surface with a space, the third electrode being configured to move relative to, and in parallel to, the first charged surface, and
at least one of a power storage unit or an output unit, wherein
the first electrode and the second electrode form a first power generating unit,
the third electrode and the second electrode form a second power generating unit,
at least one of the power storage unit or the output unit is electrically connected to both the first power generating unit and the second power generating unit, and
the electret is formed by polarizing an electret material that includes an inorganic dielectric having a bandgap energy of 4 eV or more.

### Claim 2 (depends on 1)

The power generator according to claim 1, wherein
the inorganic dielectric is an inorganic compound that has an apatite structure including phosphate ions and hydroxide ions.

### Claim 3 (depends on 1)

The power generator according to claim 1, wherein
the inorganic dielectric is a composite oxide that contains a metal element A and a metal element B and that has a basic composition expressed as ABO3, and
the composite oxide has an amorphous structure or a perovskite structure.

### Claim 4 (depends on 3)

The power generator according to claim 3, wherein
the metal element A is a rare earth element R selected from the group consisting of La, Y, Pr, Sm and Nd, and
the metal element B is Al.

### Claim 5 (depends on 4)

The power generator according to claim 4, wherein
the composite oxide has a composition in which a part of at least one of the metal element A or the metal element B is substituted by a dopant element that is different from the metal element A and the metal element B,
the dopant element that substitutes for the metal element A is an alkaline earth metal element, and
the dopant element that substitutes for the metal element B is at least one element selected from the group consisting of an alkaline earth metal element and Zn.

### Claim 6 (depends on 1)

The power generator according to claim 1, wherein
the first electrode is formed of a plurality of electrode portions adjacent to the current collecting surface.

### Claim 7 (depends on 6)

The power generator according to claim 6, wherein
at least a part of an electrode distance between the plurality of electrode portions falls within a range between 100 μm, inclusive, and 8 mm, inclusive.