Driving circuit for a vibration type actuator, vibration device, image blur correction apparatus, replacement lens, image pickup apparatus, and automatic stage

Patent metadata

Field	Value
Publication number	US-9893650-B2
Application number	US-201615234800-A
Country	US
Kind code	B2
Filing date	Aug 11, 2016
Priority date	Aug 18, 2015
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

A driving circuit for a vibration type actuator includes an inductor and a capacitor which are connected in series to an electric-mechanical energy conversion element, in which, in a case where a series resonance frequency based on the inductor and the capacitor is set as fs, and a resonance frequency in a vibration mode other than vibration used for driving of the vibrator is set as fu, 0.73·fu<fs<1.2·fu is satisfied.

First claim

What is claimed is:

1. A driving circuit for a vibration type actuator, the driving circuit comprising an inductor and a capacitor which are connected in series with the inductor,
wherein the inductor and the capacitor are configured to be connected in series to an electric-mechanical energy conversion element of a vibrator, and
wherein, in a case where a series resonance frequency based on the inductor and the capacitor is set as fs, and a resonance frequency in a vibration mode other than vibration used for driving of the vibrator is set as fu, 0.73·fu<fs<1.2·fu is satisfied.

2. The driving circuit for the vibration type actuator according to claim 1 , wherein an admittance of the vibration mode in which the resonance frequency is set as fu is higher than an admittance of any one of vibrations used for driving.

3. The driving circuit for the vibration type actuator according to claim 1 , wherein an impedance element is connected in parallel to a set of the inductor and the capacitor.

4. A vibration device comprising:
the driving circuit according to claim 1 ; and
the vibration type actuator that includes the electric-mechanical energy conversion element and is driven by the driving circuit.

5. The vibration device according to claim 4 , wherein the vibration type actuator is configured such that, while an alternating-current voltage is applied to the electric-mechanical energy conversion element, a vibration wave is excited in the vibrator including the electric-mechanical energy conversion element, and the relative position of the vibrator and part of the driven member in contact with the vibrator changes by the vibration wave.

6. An image blur correction apparatus comprising:
the vibration device according to claim 4 ; and
a lens moved by the vibration device.

7. A replacement lens comprising:
the vibration device according to claim 4 ; and
a lens moved by the vibration device.

8. An image pickup apparatus comprising:
the vibration device according to claim 4 ;
a lens moved by the vibration device; and
an image pickup element provided on an optical axis of the lens.

9. An image pickup apparatus comprising:
the vibration device according to claim 4 ;
an image pickup element moved by the vibration device; and
a lens in which the image pickup element is provided on an optical axis.

10. An automatic stage comprising:
the vibration device according to claim 4 ; and
a stage moved by the vibration device.

11. A vibration device comprising:
the driving circuit according to claim 1 ;
the vibration type actuator that includes the vibrator including the electric-mechanical energy conversion element and a driven member in contact with the vibrator and that is driven by the driving circuit; and
a position sensor configured to detect a relative position of a portion in contact with the electric-mechanical energy conversion element in the driven member and the electric-mechanical energy conversion element.

12. A driving circuit for a vibration type actuator, the driving circuit comprising:
a transformer that includes a primary side coil and a secondary side coil and is configured such that an alternating-current voltage is applied to the primary side coil, a first terminal of the secondary side coil is connected to a first terminal of an electric-mechanical energy conversion element of a vibrator, and a second terminal of the secondary side coil is connected to a second terminal of the electric-mechanical energy conversion element; and
an inductor and a capacitor connected in series to at least one of the primary side coil and the secondary side coil of the transformer,
wherein, in a case where a series resonance frequency based on the inductor and the capacitor is set as fs, and a resonance frequency in a vibration mode other than a vibration used for driving of the vibrator is set as fu, 0.73·fu<fs<1.2·fu is satisfied.

13. The driving circuit for the vibration type actuator according to claim 12 , wherein an admittance of the vibration mode in which the resonance frequency is set as fu is higher than an admittance of any one of vibrations used for driving.

14. The driving circuit for the vibration type actuator according to claim 12 , wherein an impedance element is connected in parallel to a set of the inductor and the capacitor.

15. A vibration device comprising:
the driving circuit according to claim 12 ; and
the vibration type actuator that includes the electric-mechanical energy conversion element and is driven by the driving circuit.

16. The vibration device according to claim 15 , wherein the vibration type actuator is configured such that, while an alternating-current voltage is applied to the electric-mechanical energy conversion element, a vibration wave is excited in the vibrator including the electric-mechanical energy conversion element, and the relative position of the vibrator and part of the driven member in contact with the vibrator changes by the vibration wave.

17. An image blur correction apparatus comprising:
the vibration device according to claim 15 ; and
a lens moved by the vibration device.

18. A replacement lens comprising:
the vibration device according to claim 15 ; and
a lens moved by the vibration device.

19. An image pickup apparatus comprising:
the vibration device according to claim 15 ;
a lens moved by the vibration device; and
an image pickup element provided on an optical axis of the lens.

20. An image pickup apparatus comprising:
the vibration device according to claim 15 ;
an image pickup element moved by the vibration device; and
a lens in which the image pickup element is provided on an optical axis.

21. An automatic stage comprising:
the vibration device according to claim 15 ; and
a stage moved by the vibration device.

22. A vibration device comprising:
the driving circuit according to claim 12 ;
the vibration type actuator that includes the vibrator including the electric-mechanical energy conversion element and a driven member in contact with the vibrator and that is driven by the driving circuit; and
a position sensor configured to detect a relative position of a portion in contact with the electric-mechanical energy conversion element in the driven member and the electric-mechanical energy conversion element.

Assignees

• Canon Kk

Inventors

• Sumioka Jun

Classifications

• G02B7/08

  adapted to co-operate with a remote control mechanism · CPC title

• H04N23/687

  by shifting the lens or sensor position · CPC title

• H02N2/0015

  using only bending modes · CPC title

• H02N2/065

  Large signal circuits, e.g. final stages · CPC title

• H02N2/0075 Primary

  Electrical details, e.g. drive or control circuits or methods · CPC title