Driving apparatus and lens driving apparatus having the same

Patent metadata

Field	Value
Publication number	US-10008959-B2
Application number	US-201414903543-A
Country	US
Kind code	B2
Filing date	Jul 9, 2014
Priority date	Jul 10, 2013
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A driving apparatus has a vibration plate, a vibrator having a piezoelectric element that excites vibration of the vibration plate, and first and second contact parts, and a friction member being in contact with the contact parts. The vibrator and the friction member relatively move with respect to each other, and the contact parts are provided at positions with and interpose an odd number of antinodal lines of vibration generated in a first direction of the vibrator along with excitation, and provided at positions with and interpose an odd number of nodal lines of vibration generated in a second direction of the vibrator along with excitation.

First claim

The invention claimed is:

1. A driving apparatus comprising:
a vibration plate;
a vibrator having a piezoelectric element, a first contact part and a second contact part, the piezoelectric element exciting vibration of the vibration plate; and
a friction member being in contact with the first contact part and the second contact part, wherein the vibrator and the friction member relatively move with respect to each other, and the first contact part and the second contact part are provided at positions with and interpose an odd number of antinodal lines of vibration generated in a first direction of the vibrator along with excitation, and provided at positions with and interpose an odd number of nodal lines of vibration generated in a second direction of the vibrator along with excitation.

2. The driving apparatus according to claim 1 , wherein the vibrator and the friction member relatively move with respect to each other in the first direction.

3. The driving apparatus according to claim 1 , wherein the vibration plate includes a shorter side and a longer side, the first direction corresponds to a direction along the shorter side of the vibration plate, and the second direction corresponds to a direction along the longer side of the vibration plate.

4. The driving apparatus according to claim 1 , wherein the first contact part and the second contact part are provided at opposite positions with and interpose an antinodal line of primary bending vibration generated in the first direction of the vibrator, and provided at different positions in a direction along the second direction other than positions of nodal lines of secondary bending vibration in the second direction.

5. The driving apparatus according to claim 1 , wherein the first direction the second direction are orthogonal to each other.

6. The driving apparatus according to claim 1 , wherein the first contact part and the second contact part are provided at places of one antinode of the secondary bending vibration or at places nearer the one antinode than a node on the shorter side nearest the one antinode.

7. The driving apparatus according to claim 1 , wherein the first contact part and the second contact part are provided at places of one node of the primary bending vibration or places nearer the one node than an antinode.

8. The driving apparatus according to claim 7 , wherein the first contact part and the second contact part are formed integrally with the vibration plate.

9. The driving apparatus according to claim 1 , wherein the first contact part and the second contact part are arranged on the vibration plate or the piezoelectric element.

10. The driving apparatus according to claim 1 , wherein the vibrator is retained on the longer side or the shorter side of the vibration plate.

11. The driving apparatus according to claim 1 , further comprising:
a retention member retaining the vibrator and having a rolling member,
wherein the friction member abuts on the retention member through the rolling member.

12. The driving apparatus according to claim 1 , wherein the friction member is fixed, and the vibrator moves with respect to the friction member.

13. The driving apparatus according to claim 1 ,
wherein the vibrator is fixed, and the friction member moves with respect to the vibrator.

14. A lens driving apparatus comprising:
a driving apparatus; and
a lens holder retaining a lens,
wherein the driving apparatus comprising:
a vibration plate;
a vibrator having a piezoelectric element, a first contact part and a second contact part, the piezoelectric element exciting vibration of the vibration plate; and
a friction member being in contact with the first contact part and the second contact part,
wherein the vibrator and the friction member relatively move with respect to each other, and the first contact part and the second contact part are provided at positions with and interpose an odd number of antinodal lines of vibration generated in a first direction of the vibrator along with excitation, and provided at positions with and interpose an odd number of nodal lines of vibration generated in a second direction of the vibrator along with excitation,
wherein the friction member is fixed, and the vibrator moves with respect to the friction member,
wherein the lens holder is connected to the vibrator and held movably with respect to the friction member, and
the lens holder moves with respect to the friction member to allow the lens to be moved.

15. A lens driving apparatus comprising:
a driving apparatus;
a lens holder retaining a lens,
wherein the driving apparatus comprising:
a vibration plate;
a vibrator having a piezoelectric element, a first contact part and a second contact part, the piezoelectric element exciting vibration of the vibration plate; and
a friction member being in contact with the first contact part and the second contact part,
wherein the vibrator and the friction member relatively move with respect to each other, and the first contact part and the second contact part are provided at positions with and interpose an odd number of antinodal lines of vibration generated in a first direction of the vibrator along with excitation, and provided at positions with and interpose an odd number of nodal lines of vibration generated in a second direction of the vibrator along with excitation,
wherein the vibrator is fixed, and the friction member moves with respect to the vibrator,
wherein the lens holder is connected to the friction member and held movably with respect to the vibrator, and the lens holder moves with respect to the vibrator to allow the lens to be moved.

16. A vibrator comprising:
a vibration plate;
a piezoelectric element exciting vibration of the vibration plate; and
a first contact part and a second contact part, the first contact part and the second contact part being formed as convex shape parts,
wherein the first contact part and the second contact part are provided at opposite positions with and interpose an antinodal line of a bending primary resonance frequency in a direction along a shorter side, and provided at different positions in a direction along a longer side other than a nodal line of a bending secondary resonance frequency in the direction along the longer side, and the bending primary resonance frequency and the bending secondary resonance frequency are a resonance frequency of natural vibration, and match each other or are adjacent to each other.

17. The vibrator according to claim 16 ,
wherein there is no resonance frequency of a different vibration mode between the bending primary resonance frequency in the direction along the shorter side and the bending secondary resonance frequency in the direction along the longer side.

18. The vibrator according to claim 16 ,
wherein the first contact part and the second contact part are provided at places of one antinode of bending secondary vibration or at positions nearer the one antinode than a node on the shorter side nearest the one antinode.

19. The vibrator according to claim 16 ,
wherein the first contact part and second contact part are provided at places of one node of bending primary vibration or at places nearer the one node than an antinode.

20. The vibrator according to claim 16 ,
wherein the first contact part and the second contact part are formed integrally with the vibration plate.

21. The vibrator according to claim 16 ,
wherein the first contact part and second contact part are arrange

Assignees

• Canon Kk

Inventors

• Nishitani Hitoshi

Classifications

• H02N2/0015 Primary

  using only bending modes · CPC title

• G02B7/04

  with mechanism for focusing or varying magnification · CPC title

• H02N2/103 Primary

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

• G02B7/023

  permitting adjustment · CPC title

• H02N2/12

  Constructional details · CPC title