# US 9,039,129 B2 · Inkjet head

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- Number: US 9,039,129 B2
- Document ID: US9039129B2
- Status: Granted
- Kind: B2
- Application number: 13/603,550
- Filed: 2012-09-05
- Published: 2013-03-28
- Granted: 2015-05-26
- Earliest claimed: 2011-09-26
- Assignees: Toshiba Tec Kabushiki Kaisha
- Applicants: Isao Suzuki; Hideaki Nishida; Shinichiro Hida; Kazuhisa Kimura
- Inventors: Isao Suzuki; Hideaki Nishida; Shinichiro Hida; Kazuhisa Kimura
- Web page: https://patentgrep.com/patent/US9039129B2

## CPC

- B41J 2/14201: {Structure of print heads with piezoelectric elements}
- B41J 2002/14362: {Assembling elements of heads}
- B41J 2002/14491: {Electrical connection}
- B41J 2202/08: dealing with thermal variations, e.g. cooling
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

According to one embodiment, an inkjet head includes a mask part which covers a periphery of an actuator part in a state where a nozzle hole is exposed to outside and a peripheral edge part of which is opposite to an opening peripheral edge part of a frame part at other end while a gap is kept, and the gap between the peripheral edge part of the mask part and the opening peripheral edge part of the frame part at the other end is sealed with a seal agent having thermal insulation properties.

## Claims

### Claim 1

An inkjet head comprising: a frame part, made of metal, including a side wall used also as a thermal radiation part; an ink supply pipe to supply ink into an inside from an opening of the frame part at one end; an actuator part which is provided at an opening of the frame part at the other end and includes a piezoelectric element to eject ink from a nozzle hole of an ink chamber facing outside in response to an external signal; a drive IC directly contacting an inner surface of the side wall of the frame part, said drive IC for driving the piezoelectric element; a mask part, made of metal. which covers a periphery of the actuator part in a state where the nozzle hole is exposed to the outside and a peripheral edge part of which is opposite to an opening peripheral edge part of the frame part at the other end while a gap is kept therebetween; and a seal agent which directly seals the gap between the mask part and the part and has thermal insulation properties.

### Claim 2 (depends on 1)

The inkjet head of claim 1, wherein a pressure releasing part capable of releasing inner pressure to outside atmosphere is provided in the side wall of the frame part.

### Claim 3 (depends on 2)

The inkjet head of claim 2, wherein the pressure releasing part is a screw unit including a screw hole and a screw threaded in the screw hole.

### Claim 4 (depends on 3)

The inkjet head of claim 3, wherein a protuberant wall is provided around the pressure releasing part.

### Claim 5 (depends on 4)

The inkjet head of claim 4, wherein the protuberant wall has an annular shape to surround the pressure releasing part.

### Claim 6 (depends on 5)

The inkjet head of claim 5, wherein a top part of the protuberant wall has a uniform height.

### Claim 7 (depends on 2)

The inkjet head of claim 2, wherein the pressure releasing part is a hole having a diameter of 1 mm or less.

### Claim 8 (depends on 7)

The inkjet head of claim 7, wherein a protuberant wall is provided around the pressure releasing part.

### Claim 9 (depends on 8)

The inkjet head of claim 8, wherein the protuberant wall has an annular shape to surround the pressure releasing part.

### Claim 10 (depends on 9)

The inkjet head of claim 9, wherein a top part of the protuberant wall has a uniform height.