# US 2014/0152150 A1 · Piezoelectric motor, liquid ejecting apparatus and timepiece

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- Number: US 2014/0152150 A1
- Document ID: US20140152150A1
- Status: Published application
- Kind: A1
- Application number: 14/175,735
- Filed: 2014-02-07
- Published: 2014-06-05
- Earliest claimed: 2010-03-25
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Akihito Matsumoto; Osamu Miyazawa; Yasuharu Hashimoto; Akira Matsuzawa
- Web page: https://patentgrep.com/patent/US20140152150A1

## CPC

- H02N 2/12: Constructional details
- B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- H02N 2/004: {Rectangular vibrators}
- H02N 2/0055: {Supports for driving or driven bodies; Means for pressing driving body against driven body}
- H02N 2/0065: {Friction interface (friction linings F16D69/00)}
- H02N 2/103: {by pressing one or more vibrators against the rotor}
- H02N 2/123: {Mechanical transmission means, e.g. for gearing}
- H10N 30/2023: {having polygonal or rectangular shape}
- H02N: ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

A piezoelectric motor includes: a piezoelectric actuator; and a driven portion. The piezoelectric actuator includes a piezoelectric element and a vibration member. The piezoelectric element has a piezoelectric layer and a first and a second electrode provided on both surfaces of the piezoelectric layer, respectively, and the vibration member is fixed on the first electrode side of the piezoelectric element. The driven portion which is rotated by the protrusion portion of the vibration member vibrated by the piezoelectric element, while the driven portion being abutted thereon. In the piezoelectric motor, a plurality of grooves which are open at a tip end surface of the protrusion portion and penetrate in a thickness direction are provided on a plurality of points of the protrusion portion along a rotation direction of a rotation shaft of the driven portion.

## Claims

### Claim 1

A piezoelectric motor comprising:
a piezoelectric actuator including a piezoelectric element and a vibration member, the piezoelectric element having a piezoelectric layer and a first and a second electrodes provided above both surfaces of the piezoelectric layer, respectively, and the vibration member being fixed on the first electrode side of the piezoelectric element; and
a driven portion which is rotated by the protrusion portion of the vibration member vibrated by the piezoelectric element, while the driven portion being abutted thereon,
wherein a plurality of grooves which are open at a tip end surface of the protrusion portion and penetrate in a thickness direction are provided on a plurality of points of the protrusion portion along a rotation direction of a rotation shaft of the driven portion.

### Claim 2 (depends on 1)

The piezoelectric motor according to claim 1,
wherein the grooves are formed so as to be deeper downstream with respect to the rotation direction of the rotation shaft.

### Claim 3 (depends on 1)

The piezoelectric motor according to claim 1,
wherein the grooves are formed so as to be deeper as the grooves being nearer to the both side portions of the protrusion portion.

### Claim 4 (depends on 1)

The piezoelectric motor according to claim 1,
wherein a plurality of grooves which are open at a contact surface of the driven portion with the protrusion portion and penetrate in the thickness direction are also provided on the driven portion along the rotation direction of the driven portion.

### Claim 5 (depends on 1)

A liquid ejecting apparatus comprising the piezoelectric motor according to claim 1.

### Claim 6 (depends on 1)

A timepiece comprising the piezoelectric motor according to claim 1.