# US 2008/0186360 A1 · Liquid-jet head and liquid-jet apparatus having same

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- Number: US 2008/0186360 A1
- Document ID: US20080186360A1
- Status: Published application
- Kind: A1
- Application number: 12/013,061
- Filed: 2008-01-11
- Published: 2008-08-07
- Earliest claimed: 2007-01-12
- Assignees: Seiko Epson Corporation
- Inventors: Junhua ZHANG
- Web page: https://patentgrep.com/patent/US20080186360A1

## CPC

- B41J 2/14274: {of stacked structure type, deformed by compression/extension and disposed on a diaphragm}
- B41J 2202/03: Specific materials used
- B41J 2202/11: characterised by specific geometrical characteristics
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A liquid-jet head comprising a pressure generating chamber, which is supplied with a liquid via a liquid supply path and in which a nozzle orifice for jetting the liquid is formed, and a pressure generator for causing a pressure change within the pressure generating chamber, wherein when an inertance and a passage resistance of the liquid supply path are designated as M1 and R1, respectively, and an inertance and a passage resistance of the nozzle orifice are designated as M2 and R2, respectively, relationships M2<M1 and R2>2×R1 hold.

## Claims

### Claim 1

A liquid-jet head comprising a pressure generating chamber, which is supplied with a liquid via a liquid supply path and in which a nozzle orifice for jetting the liquid is formed, and a pressure generator for causing a pressure change within the pressure generating chamber,
wherein when an inertance and a passage resistance of the liquid supply path are designated as M1 and R1, respectively, and an inertance and a passage resistance of the nozzle orifice are designated as M2 and R2, respectively, relationships M2<M1 and R2>2R1 hold.

### Claim 2 (depends on 1)

The liquid-jet head according to claim 1, wherein the liquid has a viscosity of 8.0 (mPa·s) or higher.

### Claim 3 (depends on 1)

The liquid-jet head according to claim 1, wherein the liquid has a viscosity of 8.0 (mPa·s) or higher, but 20.0 (mPa·s) or lower.

### Claim 4 (depends on 1)

The liquid-jet head according to claim 1, wherein a relationship between the passage resistances R1 and R2 is 3R1≦R2≦20R1.

### Claim 5 (depends on 1)

The liquid-jet head according to claim 1 wherein when a cross-sectional area of the liquid supply path is designated as S1, and a cross-sectional area of a liquid ejection port of the nozzle orifice is designated as S2, a relationship S2<S1 holds.

### Claim 6 (depends on 1)

A liquid-jet apparatus including the liquid-jet head according to claim 1.

### Claim 7 (depends on 2)

A liquid-jet apparatus including the liquid-jet head according to claim 2.