Driving device, piezoelectric motor, robot, electronic-component conveying device, and printer

Patent metadata

Field	Value
Publication number	US-10811998-B2
Application number	US-201715782226-A
Country	US
Kind code	B2
Filing date	Oct 12, 2017
Priority date	Oct 27, 2016
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

A driving device includes a plurality of vibrating bodies including transmitting sections configured to transmit vibration to a driven section and a control section configured to change vibration tracks of the transmitting sections of at least a pair of the vibrating bodies independently from one another. When a direction in which the driven section and the vibrating bodies are arranged is represented as a first direction and a direction orthogonal to the first direction is represented as a second direction, at least the two vibrating bodies have a plurality of vibration modes in which amplitudes in at least one of the first direction and the second direction of the transmitting sections are different, and the control section drives the at least two vibrating bodies in any one vibration mode among the plurality of vibration modes.

First claim

What is claimed is:

1. A driving device comprising:
a plurality of vibrating bodies including transmitting sections configured to transmit vibration to a driven section; and
a control section configured to change vibration tracks of the transmitting sections of the plurality of vibrating bodies independently from one another,
wherein the vibration tracks of the transmitting sections of the plurality of vibrating bodies are different from one another, and
the plurality of vibrating bodies are disposed side by side and spaced apart from one another via an air gap in a driving direction of the driven section.

2. The device according to claim 1 , wherein
when a direction in which the driven section and the vibrating bodies are arranged is represented as a first direction and a direction orthogonal to the first direction is represented as a second direction,
the plurality of vibrating bodies have a plurality of vibration modes in which amplitudes in at least one of the first direction and the second direction are different, and
the control section drives the plurality of vibrating bodies in any one vibration mode among the plurality of vibration modes.

3. The device according to claim 2 , wherein the plurality of vibration modes include a first vibration mode in which the transmitting sections have amplitudes in the first direction and the second direction and a second vibration mode in which the amplitude in the second direction is smaller than the amplitude in the first vibration mode in the transmitting sections.

4. The device according to claim 2 , wherein the plurality of vibration modes include a first vibration mode in which the transmitting sections have amplitudes in the first direction and the second direction and a third vibration mode in which the amplitude in the first direction is smaller than the amplitude in the first vibration mode in the transmitting sections.

5. The device according to claim 3 , wherein the control section changes, according to driving speed of the driven section, a number of the vibrating bodies in which the transmitting sections vibrate in the first vibration mode.

6. The device according to claim 5 , wherein, when the driving speed of the driven section increases, the control section increases the number of vibrating bodies in which the transmitting sections vibrate in the first vibration mode.

7. The device according to claim 1 , wherein the vibrating body includes a piezoelectric body.

8. The driving device according to claim 7 , wherein the vibrating body includes a stacked plurality of the piezoelectric bodies.

9. A piezoelectric motor comprising the driving device according to claim 1 .

10. A robot comprising the driving device according to claim 1 .

11. An electronic-component conveying device comprising the driving device according to claim 1 .

12. A printer comprising the driving device according to claim 1 .

Assignees

• Seiko Epson Corp

Inventors

• Kajino Kiichi

Classifications

• H02N2/0025 Primary

  using combined longitudinal modes · CPC title

• H02N2/142

  Small signal circuits; Means for controlling position or derived quantities, e.g. speed, torque, starting, stopping, reversing · CPC title

• H02N2/026

  by pressing one or more vibrators against the driven body · CPC title

• H02N2/103

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

• H02N2/14 Primary

  Drive circuits; Control arrangements {or methods} · CPC title