# US 2013/0155152 A1 · Fluid ejection device including recirculation system

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- Number: US 2013/0155152 A1
- Document ID: US20130155152A1
- Status: Published application
- Kind: A1
- Application number: 13/643,646
- Filed: 2010-05-21
- Published: 2013-06-20
- Earliest claimed: 2010-05-21
- Assignees: Hewlett-Packard Development Company, L.P.
- Inventors: Alexander Govyadinov; Erik D. Torniainen; David P. Markel
- Web page: https://patentgrep.com/patent/US20130155152A1

## CPC

- B41J 2/18: Ink recirculation systems
- B01L 3/502715: {characterised by interfacing components, e.g. fluidic, electrical, optical or mechanical interfaces}
- B01L 3/50273: {characterised by the means or forces applied to move the fluids}
- B01L 3/502746: {characterised by the means for controlling flow resistance, e.g. flow controllers, baffles or throttle valves}
- B01L 7/525: {with physical movement of samples between temperature zones}
- B41J 2/1404: {Geometrical characteristics}
- B41J 2/14201: {Structure of print heads with piezoelectric elements}
- B41J 2/1753: {Details of contacts on the cartridge, e.g. protection of contacts}
- F04B 19/006: {Micropumps (F04B43/043 and F04B43/095 take precedence)}
- F04B 19/20: Other positive-displacement pumps
- F04B 19/24: Pumping by heat expansion of pumped fluid
- F04B 43/04: Pumps having electric drive
- F17D 3/00: Arrangements for supervising or controlling working operations
- B01L 2200/10: Integrating sample preparation and analysis in single entity, e.g. lab-on-a-chip concept
- B01L 2300/0816: Cards, e.g. flat sample carriers usually with flow in two horizontal directions
- B01L 2300/0867: Multiple inlets and one sample wells, e.g. mixing, dilution
- B01L 2300/088: Channel loops
- B01L 2300/123: Flexible; Elastomeric
- B01L 2300/1827: using resistive heater
- B01L 2400/0481: squeezing of channels or chambers
- B01L 2400/082: Active control of flow resistance, e.g. flow controllers
- B41J 2002/14467: {Multiple feed channels per ink chamber}
- B41J 2202/12: with ink circulating through the whole print head
- F04B 2207/043: of time
- Y10T 137/86035: Combined with fluid receiver
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B01L: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- F17D: PIPE-LINE SYSTEMS; PIPE-LINES (pumps or compressors F04; fluid dynamics F15D; valves or the like F16K; pipes, laying pipes, supports, joints, branches, repairing, work on the entire line, accessories F16L; steam traps or the like F16T; fluid-pressure electric cables H01B9/06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A fluid ejection device including, at least, one recirculation system is disclosed. Such recirculation system contains, at least, one drop generator, recirculation channels that include an inlet channel, an outlet channel and a connection channel and a fluid feedhole that communicates with the drop generator via the inlet channel and the outlet channel of the recirculation channel. Also disclosed are inkjet pen containing it and method of using it.

## Claims

### Claim 1

A fluid ejection device comprising at least one recirculation system, such recirculation system comprises:
a. at least, one drop generator;
b. recirculation channels including an inlet channel, an outlet channel and a connection channel;
c. a fluid feedhole that communicates with the drop generator via the inlet channel and the outlet channel of the recirculation channels.

### Claim 2 (depends on 1)

The fluid ejection device according to claim 1 wherein each drop generator includes a firing chamber and a firing element.

### Claim 3 (depends on 2)

The fluid ejection device according to claim 2 wherein each firing element is a resistor.

### Claim 4 (depends on 1)

The fluid ejection device according to claim 1 wherein each drop generator includes a nozzle.

### Claim 5 (depends on 1)

The fluid ejection device according to claim 1 wherein the recirculation system further comprises an auxiliary resistor.

### Claim 6 (depends on 1)

The fluid ejection device according to claim 1 comprising a plurality of recirculation system each including recirculation channels comprising an inlet channel, an outlet channel and a connection channel.

### Claim 7 (depends on 1)

The fluid ejection device according to claim 1 wherein the recirculation system further comprises particle tolerant architectures.

### Claim 8 (depends on 1)

The fluid ejection device according to claim 1 wherein the recirculation system further comprises non-moving part valves.

### Claim 9 (depends on 1)

The fluid ejection device according to claim 1 wherein the recirculation system comprises a plurality of drop generators, each containing a firing chamber and a firing element.

### Claim 10 (depends on 1)

The fluid ejection device according to claim 1 wherein the recirculation system comprises a plurality of drop generators, at least an auxiliary resistor, non-moving part valves and particle tolerant architecture.

### Claim 11 (depends on 1)

An inkjet pen comprising a fluid ejection device such as defined in claim 1.

### Claim 12 (depends on 1)

Method for inducing printing fluid flow, in the recirculation system of the fluid ejection device such as defined in claim 1, that comprises applying a sub-TOE energy or full energy pulse to auxiliary resistor and/or applying a sub-TOE energy pulse to firing element of the drop generator.

### Claim 13 (depends on 1)

A method of jetting printing fluid drops, from the fluid ejection device such as defined in claim 1, that comprises inducing a printing fluid flow in the recirculation system by applying a sub-TOE energy or full energy pulse to auxiliary resistor and/or applying a sub-TOE energy pulse to firing element of the drop generator; and applying an energy sufficient to able printing fluid to drop by the orifice of the drop generator.

### Claim 14 (depends on 1)

A method of jetting printing fluid drops, from the fluid ejection device such as defined in claim 1, comprising inducing a printing fluid flow in the recirculation system by applying energy sufficient to able printing fluid to drop by the orifice of the drop generator.

### Claim 15 (depends on 13)

The method of jetting printing fluid drops according to claim 13 wherein the printing fluid is an inkjet ink.