# US 2023/0055056 A1 · Reservoir element and neuromorphic device

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- Number: US 2023/0055056 A1
- Document ID: US20230055056A1
- Status: Published application
- Kind: A1
- Application number: 17/794,839
- Filed: 2020-03-25
- Published: 2023-02-23
- Earliest claimed: 2020-03-25
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Eiji SUZUKI
- Web page: https://patentgrep.com/patent/US20230055056A1

## CPC

- H10N 30/20: with electrical input and mechanical output, e.g. functioning as actuators or vibrators
- H10N 35/80: Constructional details
- G06N 3/06: Physical realisation, i.e. hardware implementation of neural networks, neurons or parts of neurons
- H10N 30/802: {Circuitry or processes for operating piezoelectric or electrostrictive devices not otherwise provided for, e.g. drive circuits}
- H10N 30/87: Electrodes or interconnections, e.g. leads or terminals
- H10N 35/00: Magnetostrictive devices (integrated devices or assemblies of multiple devices H10N39/00)
- H10N 35/85: Magnetostrictive active materials
- H10N 30/302: {Sensors}
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS

## Abstract

In a reservoir element that has a plurality of vibrators, at least one of the plurality of vibrators has a vibration state that is different from the vibration states of the other vibrators. The vibrations of the plurality of vibrators are configured to affect each other.

## Claims

### Claim 1

A reservoir element, comprising:
a plurality of vibrators,
wherein at least one of the plurality of vibrators has a vibration state different from vibration states of the other vibrators, and
vibrations of the plurality of vibrators are configured to affect each other.

### Claim 2 (depends on 1)

The reservoir element according to claim 1, further comprising:
a connection plate,
wherein the connection plate is connected to each of the plurality of vibrators.

### Claim 3 (depends on 1)

The reservoir element according to claim 1, wherein at least one of the plurality of vibrators has a size or a material different from sizes or materials of the other vibrators.

### Claim 4 (depends on 1)

The reservoir element according to claim 1,
wherein each of the plurality of vibrators has a magnetostrictive film, and
the reservoir element further includes a magnetic field applying unit configured to apply a magnetic field to each of the magnetostrictive films.

### Claim 5 (depends on 4)

The reservoir element according to claim 4,
wherein the magnetic field applying unit is configured to apply a magnetic field different from magnetic fields of the other magnetostrictive films to at least one of the plurality of magnetostrictive films.

### Claim 6 (depends on 1)

The reservoir element according to claim 1,
wherein each of the plurality of vibrators has an electrode, and
the reservoir element further includes:
a counter electrode facing the electrode; and
a first alternating current (AC) power supply configured to apply an AC voltage between the electrode and the counter electrode.

### Claim 7 (depends on 1)

The reservoir element according to claim 1,
wherein each of the plurality of vibrators has an electrode,
the reservoir element further includes:
a counter electrode facing the electrode; and
a direct current (DC) power supply configured to apply a DC voltage between the electrode and the counter electrode, and
a potential difference between the electrode of any of the vibrators and the counter electrode is different from potential differences between the electrodes of the other vibrators and the counter electrode.

### Claim 8 (depends on 1)

The reservoir element according to claim 1,
wherein each of the plurality of vibrators has:
a piezoelectric material; and
an upper electrode and a lower electrode which sandwich the piezoelectric material therebetween, and
the reservoir element further includes a second AC power supply configured to apply an AC voltage between the upper electrode and the lower electrode.

### Claim 9 (depends on 1)

The reservoir element according to claim 1, further comprising:
a strain sensor which is in contact with each of the plurality of vibrators.

### Claim 10 (depends on 1)

A neuromorphic device, comprising:
the reservoir element according to claim 1.

### Claim 11 (depends on 2)

The reservoir element according to claim 2,
wherein at least one of the plurality of vibrators has a size or a material different from sizes or materials of the other vibrators.

### Claim 12 (depends on 2)

The reservoir element according to claim 2,
wherein each of the plurality of vibrators has a magnetostrictive film, and
the reservoir element further includes a magnetic field applying unit configured to apply a magnetic field to each of the magnetostrictive films.

### Claim 13 (depends on 3)

The reservoir element according to claim 3,
wherein each of the plurality of vibrators has a magnetostrictive film, and
the reservoir element further includes a magnetic field applying unit configured to apply a magnetic field to each of the magnetostrictive films.

### Claim 14 (depends on 2)

The reservoir element according to claim 2,
wherein each of the plurality of vibrators has an electrode, and
the reservoir element further includes:
a counter electrode facing the electrode; and
a first alternating current (AC) power supply configured to apply an AC voltage between the electrode and the counter electrode.

### Claim 15 (depends on 3)

The reservoir element according to claim 3,
wherein each of the plurality of vibrators has an electrode, and
the reservoir element further includes:
a counter electrode facing the electrode; and
a first alternating current (AC) power supply configured to apply an AC voltage between the electrode and the counter electrode.

### Claim 16 (depends on 4)

The reservoir element according to claim 4,
wherein each of the plurality of vibrators has an electrode, and the reservoir element further includes:
a counter electrode facing the electrode; and
a first alternating current (AC) power supply configured to apply an AC voltage between the electrode and the counter electrode.

### Claim 17 (depends on 5)

The reservoir element according to claim 5,
wherein each of the plurality of vibrators has an electrode, and
the reservoir element further includes:
a counter electrode facing the electrode; and
a first alternating current (AC) power supply configured to apply an AC voltage between the electrode and the counter electrode.

### Claim 18 (depends on 2)

The reservoir element according to claim 2,
wherein each of the plurality of vibrators has an electrode,
the reservoir element further includes:
a counter electrode facing the electrode; and
a direct current (DC) power supply configured to apply a DC voltage between the electrode and the counter electrode, and
a potential difference between the electrode of any of the vibrators and the counter electrode is different from potential differences between the electrodes of the other vibrators and the counter electrode.

### Claim 19 (depends on 3)

The reservoir element according to claim 3,
wherein each of the plurality of vibrators has an electrode,
the reservoir element further includes:
a counter electrode facing the electrode; and
a direct current (DC) power supply configured to apply a DC voltage between the electrode and the counter electrode, and
a potential difference between the electrode of any of the vibrators and the counter electrode is different from potential differences between the electrodes of the other vibrators and the counter electrode.

### Claim 20 (depends on 4)

The reservoir element according to claim 4,
wherein each of the plurality of vibrators has an electrode,
the reservoir element further includes:
a counter electrode facing the electrode; and
a direct current (DC) power supply configured to apply a DC voltage between the electrode and the counter electrode, and
a potential difference between the electrode of any of the vibrators and the counter electrode is different from potential differences between the electrodes of the other vibrators and the counter electrode.