Piezoelectric resonator and drive device

Patent metadata

Field	Value
Publication number	US-11764704-B2
Application number	US-202217748062-A
Country	US
Kind code	B2
Filing date	May 19, 2022
Priority date	May 21, 2021
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A piezoelectric resonator includes a vibrating part having a pair of principal surfaces in an obverse-reverse relationship, and a side surface configured to couple the pair of principal surfaces to each other, and a protruding part which is provided to the vibrating part, and is configured to transmit a drive force generated by a vibration of the vibrating part to a driven part, wherein the vibrating part has a pair of vibrating plates including a first vibrating plate and a second vibrating plate stacked on one another in afirst direction in which the pair of principal surfaces are arranged side by side, the first vibrating plate has a flexural vibrating piezoelectric element configured to flexurally vibrate the vibrating part in a third direction perpendicular to a second direction in which the driven part and the protruding part are arranged side by side in a plan view of the principal surfaces, either one or both of the first vibrating plate and the second vibrating plate have a stretching vibrating piezoelectric element configured to make the vibrating part perform a stretching vibration in the second direction, and the side surface is provided with a plurality of terminals electrically coupled to the flexural vibrating piezoelectric element and the stretching vibrating piezoelectric element.

First claim

What is claimed is:

1. A piezoelectric resonator comprising:
a vibrating part having a pair of principal surfaces in an obverse-reverse relationship, and a side surface configured to couple the pair of principal surfaces to each other; and
a protruding part which is provided to the vibrating part, and is configured to transmit a drive force generated by a vibration of the vibrating part to a driven part, wherein
the vibrating part has a pair of vibrating plates including a first vibrating plate and a second vibrating plate stacked on one another in a first direction in which the pair of principal surfaces are arranged side by side,
the first vibrating plate has a flexural vibrating piezoelectric element configured to flexurally vibrate the vibrating part in a third direction perpendicular to a second direction in which the driven part and the protruding part are arranged side by side in a plan view of the principal surfaces,
either one or both of the first vibrating plate and the second vibrating plate have a stretching vibrating piezoelectric element configured to make the vibrating part perform a stretching vibration in the second direction, and
the side surface is provided with a plurality of terminals electrically coupled to the flexural vibrating piezoelectric element and the stretching vibrating piezoelectric element.

2. The piezoelectric resonator according to claim 1 , wherein
the stretching vibrating piezoelectric element is provided to each of the first vibrating plate and the second vibrating plate.

3. The piezoelectric resonator according to claim 1 , wherein
the stretching vibrating piezoelectric element is provided to the second vibrating plate.

4. The piezoelectric resonator according to claim 1 , wherein
either one or both of the first vibrating plate and the second vibrating plate have a detecting piezoelectric element configured to detect a vibration of the vibrating part.

5. The piezoelectric resonator according to claim 1 , further comprising:
a wiring board electrically coupled to the plurality of terminals.

6. The piezoelectric resonator according to claim 1 , further comprising:
a case configured to house the vibrating part; and
a biasing part configured to bias the vibrating part toward a tip of the protruding part with respect to the case.

7. A drive device comprising:
a driven part; and
a piezoelectric resonator configured to drive the driven part, wherein
the piezoelectric resonator includes
a vibrating part having a pair of principal surfaces in an obverse-reverse relationship, and a side surface configured to couple the pair of principal surfaces to each other, and
a protruding part which is provided to the vibrating part, and is configured to transmit a drive force generated by a vibration of the vibrating part to a driven part,

the vibrating part has a pair of vibrating plates including a first vibrating plate and a second vibrating plate stacked on one another in a first direction in which the pair of principal surfaces are arranged side by side,
the first vibrating plate has a flexural vibrating piezoelectric element configured to flexurally vibrate the vibrating part in a third direction perpendicular to a second direction in which the driven part and the protruding part are arranged side by side in a plan view of the principal surfaces,
either one or both of the first vibrating plate and the second vibrating plate have a stretching vibrating piezoelectric element configured to make the vibrating part perform a stretching vibration in the second direction, and
the side surface is provided with a plurality of terminals electrically coupled to the flexural vibrating piezoelectric element and the stretching vibrating piezoelectric element.

8. The drive device according to claim 7 , further comprising:
a switch circuit configured to switch the stretching vibrating piezoelectric element to a detecting piezoelectric element configured to detect a vibration of the vibrating part.

Assignees

• Seiko Epson Corp

Inventors

• Miyazawa Takao

Classifications

• H02N2/004

  Rectangular vibrators · CPC title

• H10N30/2023

  having polygonal or rectangular shape · CPC title

• H02N2/0015 Primary

  using only bending modes · CPC title

• H02N2/103 Primary

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

• H02N2/0075

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