# US 2018/0022095 A1 · Inkjet head and inkjet printer

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- Number: US 2018/0022095 A1
- Document ID: US20180022095A1
- Status: Published application
- Kind: A1
- Application number: 15/547,002
- Filed: 2016-03-22
- Published: 2018-01-25
- Earliest claimed: 2015-03-27
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Eiju Hirai; Toshiaki Hamaguchi; Yoichi Naganuma; Motoki Takabe
- Web page: https://patentgrep.com/patent/US20180022095A1

## CPC

- B41J 2/14233: {of film type, deformed by bending and disposed on a diaphragm}
- B41J 2/14072: {Electrical connections, e.g. details on electrodes, connecting the chip to the outside...}
- B41J 2002/14362: {Assembling elements of heads}
- B41J 2002/14491: {Electrical connection}
- B41J 2202/18: Electrical connection established using vias
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

An inkjet head includes: a pressure chamber-forming plate in which a plurality of pressure chambers each communicating with a nozzle are formed in a first direction; a vibration plate that defines one surface of each pressure chamber and allows for deformation of a defining region thereof; a piezoelectric element formed by stacking a first electrode layer, a piezoelectric layer, and a second electrode layer in a region corresponding to the pressure chamber in an order from a surface of the vibration plate, which is opposite to the pressure chamber; a circuit board that is arranged at an interval from the vibration plate, with a plurality of bump electrodes interposed therebetween, and outputs a signal for driving the piezoelectric element; and an adhesive agent that bonds the pressure chamber-forming plate and the circuit board, wherein an element end on at least one side of the piezoelectric element is formed outside of the defining region and covered by the adhesive agent in a second direction orthogonal to the first direction.

## Claims

### Claim 1

An inkjet head comprising:
a pressure chamber-forming plate in which a plurality of pressure chambers each communicating with a nozzle are formed in a first direction;
a vibration plate that defines one surface of each pressure chamber and allows for deformation of a defining region thereof;
a piezoelectric element formed by stacking a first electrode layer, a piezoelectric layer, and a second electrode layer in a region corresponding to the pressure chamber in an order from a surface of the vibration plate, which is opposite to the pressure chamber;
a circuit board that is arranged at an interval from the vibration plate, with a plurality of bump electrodes interposed therebetween, and outputs a signal for driving the piezoelectric element; and
an adhesive agent that bonds the pressure chamber-forming plate and the circuit board, wherein
an element end on at least one side of the piezoelectric element is formed outside of the defining region and covered by the adhesive agent in a second direction orthogonal to the first direction.

### Claim 2 (depends on 1)

The inkjet head according to claim 1, wherein
the adhesive agent is formed to extend from the element end to a position overlapping an end of the defining region in the second direction, which is closer to the element end.

### Claim 3 (depends on 1)

The inkjet head according to claim 1, wherein the bump electrode includes elastic resin, and a conductive film covering a surface of the resin.

### Claim 4 (depends on 1)

The inkjet head according to claim 1, wherein the bump electrode is electrically connected with at least one of the first electrode layer and the second electrode layer on the piezoelectric layer formed in a region outside of the defining region.

### Claim 5 (depends on 1)

The inkjet head according claim 1, wherein the adhesive agent is photosensitive.

### Claim 6 (depends on 1)

An inkjet printer comprising the inkjet head according to claim 1.