# US 8,783,840 B2 · Liquid jet head

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- Number: US 8,783,840 B2
- Document ID: US8783840B2
- Status: Granted
- Kind: B2
- Application number: 13/741,115
- Filed: 2013-01-14
- Published: 2013-06-27
- Granted: 2014-07-22
- Earliest claimed: 2001-10-04
- Assignees: Seiko Epson Corporation (HQ)
- Applicants: Seiko Epson Corporation
- Inventors: Noriaki Okazawa
- Web page: https://patentgrep.com/patent/US8783840B2

## CPC

- B41J 2/14016: {Structure of bubble jet print heads}
- B41J 2/175: Ink supply systems {; Circuit parts therefor}
- B41J 2/055: Devices for absorbing or preventing back-pressure
- B41J 2/14274: {of stacked structure type, deformed by compression/extension and disposed on a diaphragm}
- B41J 2/16526: {by applying pressure only}
- B41J 2/17596: {Ink pumps, ink valves}
- B41J 2/16532: {by applying vacuum only}
- B41J 2002/1437: {Back shooter}
- B41J 2002/14419: {Manifold}
- 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 apparatus is provided. The liquid jet apparatus includes a first damper chamber and a second damper chamber, a release path operatively associated with both the first damper chamber and the second damper chamber, and a control path connecting the first damper chamber, the second damper chamber, and the release path to each other.

## Claims

### Claim 1

An inkjet recording head comprising:
a first damper chamber and a second damper chamber;
a release path operatively associated with both the first damper chamber and the second damper chamber, and the release path releasing pressure in the first and the second damper chamber to the air;
a first control path which connects the first damper chamber and the release path; and
a second control path which connects the second damper chamber and the release path;
wherein two paths that are different from one another are respectively provided in between the first damper chamber and the release path, and in between the second damper chamber and the release path; and
wherein one of the two paths that is provided in between the first damper chamber and the release path is a path passing through the first control path, the other of the two paths that is provided in between the first damper chamber and the release path is a path passing through the second control path and a connection cavity.

### Claim 2 (depends on 1)

The inkjet recording head according to claim 1, wherein the connection cavity connects the first damper chamber and the second damper chamber mutually, and the connection cavity enable communication between the first damper chamber and the second damper chamber.

### Claim 3 (depends on 1)

The inkjet recording head according to claim 1, wherein one of the two paths that is provided in between the second damper chamber and the release path is a path passing through the second control path, the other of the two paths that is provided in between the first damper chamber and the release path is a path passing through the first control path and the connection cavity.

### Claim 4 (depends on 1)

The inkjet recording head according to claim 1, wherein a width of the first control path and a width of the second control path are thinner than diameter of the release path.