# US 4,394,670 A · Ink jet head and method for fabrication thereof

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- Number: US 4,394,670 A
- Document ID: US4394670A
- Status: Granted
- Kind: A
- Application number: 06/335,466
- Filed: 1981-12-29
- Granted: 1983-07-19
- Earliest claimed: 1981-01-09
- Assignees: Canon Kabushiki Kaisha
- Inventors: Hiroshi Sugitani; Hiroto Matsuda; Koichi Kimura; Masami Ikeda
- Web page: https://patentgrep.com/patent/US4394670A

## CPC

- B41J 2/1623: {bonding and adhesion}
- B41J 2/1604: {of the edge shooter type}
- B41J 2/1626: {etching}
- B41J 2/1631: {photolithography}
- B41J 2/1632: {machining}
- B41J 2/1639: {sacrificial molding}
- B41J 2/164: {thin film formation}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

An ink jet head comprises an ink flow path formed by laminating cured films or photosensitive compositions and an ink discharging orifice, at least the ink discharging orifice region being composed of the cured films. A method for fabrication of an ink-jet head comprises forming a first film of a cured photosensitive resin on a surface of a substrate on which an ink discharge pressure generating element is arranged, produced an ink flow path with a second film of a cured photosensitive resin formed on the first film, further disposing a third film of a cured photosensitive resin on the second film, and forming an ink discharging orifice connected to the ink flow path, with the said first, second and third films of cured photosensitive resins.

## Claims

### Claim 1

An ink-jet head comprising an ink flow path formed by laminating cured films of photosensitive compositions and an ink discharging orifice, at least the ink discharging orifice region being composed of the cured films.

### Claim 2 (depends on 1)

An ink-jet head according to claim 1, wherein said compositions are photosensitive resins.

### Claim 3 (depends on 1)

An ink-jet head according to claim 1, wherein said composition is a dry film photoresist.

### Claim 4 (depends on 1)

An ink-jet head according to claim 1, wherein said composition is in a form of film having a thickness of 25-100 microns.

### Claim 5 (depends on 1)

An ink-jet head according to claim 1, wherein an ink discharging pressure generating element is disposed in said ink flow path.

### Claim 6 (depends on 1)

An ink-jet head according to claim 1, wherein said ink flow path is in communication with an ink discharging port.

### Claim 7 (depends on 1)

An ink-jet head according to claim 1, wherein a plurality of said ink paths are provided.

### Claim 8

An ink-jet head having an ink flow path and an ink discharging orifice connected to the ink flow path comprising a substrate having an ink discharge pressure generating element, a first film of a cured photosensitive composition laminated to the substrate with at least the ink discharging pressure generating element is not covered with the first film, a second film of a cured photosensitive composition laminated to the first film and a third film of a cured photosensitive composition laminated to the second film, the first, second and the third films defining the ink flow path and the ink discharging orifice.

### Claim 9 (depends on 8)

An ink-jet head according to claim 8, wherein said composition is a photosensitive resin.

### Claim 10 (depends on 8)

An ink-jet head according to claim 8, wherein said composition is a dry film photoresist.

### Claim 11 (depends on 8)

An ink-jet head according to claim 8, wherein said composition is in a form of film having a thickness of 25-100 microns.

### Claim 12 (depends on 8)

An ink-jet head according to claim 8, wherein said ink flow path is defined in a cured resin film.

### Claim 13 (depends on 8)

An ink-jet head according to claim 8, wherein an ink discharging pressure generating element is disposed in said ink flow path.

### Claim 14 (depends on 8)

An ink-jet head according to claim 8, wherein a plurality of said ink flow paths are provided.

### Claim 15

A method for fabrication of an ink jet head, which comprises forming a first film of a cured photosensitive resin on a surface of a substrate on which an ink discharge pressure generating element is arranged, producing an ink flow path with a second film of a cured photosensitive resin formed on the first film, disposing a third film of a cured photosensitive resin on the second film, and forming an ink discharging orifice connected to the ink flow path, with the said first, second and third films being composed of cured photosensitive resins.

### Claim 16 (depends on 15)

A method as set forth in claim 15, wherein said resin is a dry film photoresist.

### Claim 17 (depends on 15)

A method as set forth in claim 15, wherein said resin is in a form of film having thickness of 25-100 microns.

### Claim 18 (depends on 15)

A method as set forth in claim 15, wherein an ink discharging pressure generating element is disposed in said ink flow path.

### Claim 19 (depends on 15)

A method as set forth in claim 15, wherein a plurality of said ink flow paths are provided.