Vibration driving device for a strong magnetic-field environment

Patent metadata

Field	Value
Publication number	US-12463560-B2
Application number	US-202217668950-A
Country	US
Kind code	B2
Filing date	Feb 10, 2022
Priority date	Feb 17, 2021
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A vibration driving device includes a vibration actuator including a vibrating body and a contact body, the vibrating body including an elastic body and an electromechanical energy conversion element, the contact body being in contact with the vibrating body and movable relatively to the vibrating body; and a control device including a signal generating circuit and a boosting circuit, the boosting circuit including an air-core transformer electrically connected to the signal generating circuit. The vibration actuator is configured to receive a signal output by the control device.

First claim

What is claimed is:

1 . A vibration driving device comprising:
a vibration actuator including a vibrating body and a contact body, the vibrating body including an elastic body and an electromechanical energy conversion element, the contact body being in contact with the vibrating body and movable relatively to the vibrating body; and a control device including a signal generating circuit and a boosting circuit, the boosting circuit including an air-core transformer electrically connected to the signal generating circuit, wherein the vibration actuator is configured to receive a signal output by the control device, wherein the air-core transformer has a coupling coefficient k that satisfies an expression: 0.6<k<0.9, and wherein the air-core transformer has a turns ratio N that satisfies an expression:

N
=

V
0

(

4
/
π

)

·
Vi
·
k

,

where Vo represents a peak-to-peak amplitude of an alternating-current voltage signal, Vi represents a peak-to-peak amplitude of a pulse signal, and k represents the coupling coefficient of the air-core transformer.

2 . The vibration driving device according to claim 1 , wherein the air-core transformer includes a bobbin and a coil wound around the bobbin without a core.

3 . The vibration driving device according to claim 1 , wherein the air-core transformer includes a center tap terminal.

4 . The vibration driving device according to claim 1 , wherein the boosting circuit further includes an air-core coil electrically connected to the air-core transformer.

5 . The vibration driving device according to claim 4 , wherein the boosting circuit further includes a capacitor connected to the air-core coil in series.

6 . The vibration driving device according to claim 1 , wherein the vibration actuator has a velocity controlled by at least one of a frequency, a phase difference, or a pulse width generated by the signal generating circuit.

7 . The vibration driving device according to claim 1 , wherein the signal comprises a pulse signal.

8 . The vibration driving device according to claim 1 , further comprising
a housing, wherein the vibration actuator and the control device are accommodated in the housing.

9 . A medical apparatus comprising:
the vibration driving device according to claim 1 ; and a medical device configured to be driven by the vibration actuator.

10 . The medical apparatus according to claim 9 , wherein the medical device includes at least one of a medical agent dispenser, an injector, an aspirator, and a puncture needle.

11 . The medical apparatus according to claim 9 , wherein the medical apparatus is configured to be driven under a magnetic-field environment having a magnetic flux density of 100 mT or more.

12 . The medical apparatus according to claim 11 , wherein the medical apparatus is configured to be driven under a magnetic-field environment having a magnetic flux density of 300 mT or more.

13 . A medical system comprising:
the medical apparatus according to claim 9 ; and a magnetic resonance imaging (MRI) apparatus.

14 . A method of using a medical apparatus, comprising:
preparing the medical apparatus according to claim 9 ; locating the medical apparatus under a magnetic-field environment having a magnetic flux density of 100 mT or more; and using the medical apparatus under the magnetic-field environment.

Assignees

• Canon Kk

Inventors

• Sumioka Jun
• Yamamoto Shinji

Classifications

• H01F27/29 Primary

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F27/325

  Coil bobbins (formers for coils in general H01F5/02) · CPC title

• A61B5/055

  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging · CPC title

• H02N2/103

  by pressing one or more vibrators against the rotor · CPC title

• H02N2/0015

  using only bending modes · CPC title