Driving device

Patent metadata

Field	Value
Publication number	US-10103650-B2
Application number	US-201514937283-A
Country	US
Kind code	B2
Filing date	Nov 10, 2015
Priority date	Nov 19, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

In a piezoelectric driving device, a load due to flection deformation of a flexible substrate can be prevented from being applied to a piezoelectric element and decrease in driving efficiency of the driving device can be prevented. The flexible substrate of the driving device includes a first fixing portion fixed to the piezoelectric element, a second fixing portion fixed to a holding member, and a bending portion in which the flection deformation is formed with movement of a vibrating plate. The second fixing portion is provided between the first fixing portion and the bending portion along the flexible substrate.

First claim

What is claimed is:

1. A driving device comprising:
a vibrating plate including a substantially rectangular flat plate portion and projecting portions provided on the flat plate portion;
a piezoelectric element fixed on the vibrating plate and configured to produce a high-frequency vibration;
a flexible substrate fixed on the piezoelectric element and configured to supply power to the piezoelectric element;
a holding member configured to hold the vibrating plate;
a press member configured to bias the vibrating plate; and
a friction member contacted by the vibrating plate biased by the press member,
wherein the vibrating plate moves relative to the friction member according to the high-frequency vibration of the piezoelectric element,
wherein the flexible substrate comprises a first fixing portion fixed to the piezoelectric element, a second fixing portion fixed to the holding member, and a bending portion configured to make flection deformation along with movement of the vibrating plate, and
wherein the second fixing portion is provided between the first fixing portion and the bending portion along the flexible substrate.

2. The driving device according to claim 1 , wherein the flexible substrate extends from a position serving as a node of a vibration mode of the vibrating plate.

3. The driving device according to claim 1 , wherein the holding member is divided into a first holding member configured to hold the vibrating plate and a second holding member configured to hold the first holding member, and
the flexible substrate is fixed to one of the first holding member and the second holding member.

4. The driving device according to claim 1 , wherein the second fixing portion is provided on an extension line in a direction in which the flexible substrate extends from the first fixing portion.

5. The driving device according to claim 1 , wherein a direction in which the flexible substrate extends from the first fixing portion is a direction perpendicular to a moving direction of the vibrating plate and a press direction of the vibrating plate.

6. The driving device according to claim 1 , wherein the flexible substrate is fixed at the second fixing portion such that movements in a moving direction of the vibrating plate and a press direction of the vibrating plate are regulated, and a movement in a direction perpendicular to the moving direction and the press direction is not regulated.

7. The driving device according to claim 1 , wherein a frequency of the high-frequency vibration generated by the piezoelectric element is different from a resonance frequency of a natural vibration mode of the flexible substrate between the first fixing portion and the second fixing portion out of the flexible substrate.

8. The driving device according to claim 1 , wherein the driving device comprises an ultrasonic motor.

9. A driving device comprising:
a vibrating member including a plate portion on which a piezoelectric element is fixed and a projecting portion;
a flexible substrate fixed to the piezoelectric element and configured to supply power to the piezoelectric element; and
a movable member configured to move with the vibrating member,
wherein the vibrating member moves relative to a friction member contacting the projecting portion according to vibration of the vibrating member,
wherein the flexible substrate comprises a first fixing portion fixed to the piezoelectric element, a second fixing portion fixed to the movable member, and a bending portion configured to make flection deformation along with movement of the vibrating member, and
wherein the second fixing portion is provided between the first fixing portion and the bending portion along the flexible substrate.

Assignees

• Canon Kk

Inventors

• Ninomiya Shunsuke

Classifications

• H02N2/0085

  Leads; Wiring arrangements · CPC title

• H02N2/026 Primary

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

• H02N2/0015

  using only bending modes · CPC title