# US 10,500,850 B2 · Fluid ejection device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,500,850 B2
- Document ID: US10500850B2
- Status: Granted
- Kind: B2
- Application number: 15/516,436
- Filed: 2014-10-29
- Published: 2018-08-16
- Granted: 2019-12-10
- Earliest claimed: 2014-10-29
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Hewlett-Packard Development Company, L.P.
- Inventors: Alexander Govyadinov; Paul A Richards
- Web page: https://patentgrep.com/patent/US10500850B2

## CPC

- B41J 2/14056: {Plural heating elements per ink chamber}
- B41J 2/1404: {Geometrical characteristics}
- B41J 2/14088: {Structure of heating means}
- B41J 2/175: Ink supply systems {; Circuit parts therefor}
- B41J 2002/14467: {Multiple feed channels per ink chamber}
- B41J 2202/12: with ink circulating through the whole print head
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

A fluid ejection device includes a fluid slot, a fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the fluid ejection chamber, a fluid circulation channel communicated at one end with the fluid slot and communicated at another end with the fluid ejection chamber, a fluid circulating element within the fluid circulation channel, and a channel wall separating the fluid ejection chamber and the fluid circulation channel. The fluid circulation channel includes a channel loop, and a width of the channel wall is based on a width of the channel loop and a width of the fluid ejection chamber.

## Claims

### Claim 1

A fluid ejection device, comprising:
a fluid slot;
a fluid ejection chamber communicated with the fluid slot;
a drop ejecting element within the fluid ejection chamber;
a fluid circulation channel communicated at one end with the fluid slot and communicated at another end with the fluid ejection chamber;
a fluid circulating element within the fluid circulation channel; and
a channel wall separating the fluid ejection chamber and the fluid circulation channel, the channel wall defined as a distance between a sidewall of the fluid ejection chamber and a sidewall of a portion of the fluid circulation channel in which the fluid circulating element is positioned,
wherein the fluid circulation channel includes a channel loop, and
wherein a width of the channel wall is defined based on a width of the channel loop and a width of the fluid ejection chamber.

### Claim 2 (depends on 1)

The fluid ejection device of claim 1, wherein the width of the channel wall is defined as CW=(42−CLW−ChW)/2, wherein CLW is a width of the channel loop, and ChW is a width of the fluid ejection chamber.

### Claim 3 (depends on 2)

The fluid ejection device of claim 2, wherein the width of the channel wall is in a range of approximately 5 microns to approximately 11 microns.

### Claim 4 (depends on 3)

The fluid ejection device of claim 3, wherein the width of the channel loop is in a range of approximately 5 microns to approximately 16 microns, and the width of the fluid ejection chamber is in a range of approximately 14 microns to approximately 26 microns.

### Claim 5 (depends on 1)

The fluid ejection device of claim 1, wherein the fluid ejection device includes a plurality of fluid ejection chambers and corresponding drop ejecting elements, and a plurality of fluid circulation channels and corresponding fluid circulating elements, wherein each fluid circulation channel communicates with a single fluid ejection chamber.

### Claim 6 (depends on 5)

The fluid ejection device of claim 5, wherein a pitch of adjacent fluid circulating elements is substantially equal to a pitch of adjacent drop ejecting elements.

### Claim 7 (depends on 6)

The fluid ejection device of claim 6, wherein a spacing between a drop ejecting element and an associated fluid circulating element is approximately one-half of the pitch of adjacent drop ejecting elements.

### Claim 8 (depends on 1)

The fluid ejection device of claim 1, wherein the fluid ejection chamber is formed in a barrier layer provided on a substrate.

### Claim 9 (depends on 1)

The fluid ejection device of claim 1, wherein a main resistor shelf length defined as a distance from a main resistor and an edge of the fluid slot and a pump resistor shelf length defined as a distance from an edge of the fluid circulating element to the edge of the fluid slot are different lengths.

### Claim 10 (depends on 9)

The fluid ejection device of claim 9, wherein the main resistor shelf length is between 0 and 60 microns.

### Claim 11 (depends on 9)

The fluid ejection device of claim 9, wherein the pump resistor shelf length is between 0 and 60 microns.

### Claim 12 (depends on 1)

The fluid ejection device of claim 1, wherein a peninsula extending from the channel wall towards the fluid slot has a length less than 80 microns.

### Claim 13

A fluid ejection device, comprising:
a fluid slot;
a fluid ejection chamber communicated with the fluid slot;
a drop ejecting element within the fluid ejection chamber;
a fluid circulation channel communicated at one end with the fluid slot and communicated at another end with the fluid ejection chamber; and
a fluid circulating element within the fluid circulation channel,
wherein the fluid circulation channel includes a channel loop, and
wherein a width of the channel loop is selected based on a spacing between the fluid circulation channel and the fluid ejection chamber, and a width of the fluid ejection chamber.

### Claim 14 (depends on 13)

The fluid ejection device of claim 13, wherein the width of the channel loop is defined as 42−2CW−ChW, wherein CW is the spacing between the fluid circulation channel and the fluid ejection chamber, and ChW is the width of the fluid ejection chamber.

### Claim 15 (depends on 14)

The fluid ejection device of claim 14, wherein the width of the channel loop is in a range of approximately 5 microns to approximately 16 microns.

### Claim 16 (depends on 15)

The fluid ejection device of claim 15, wherein the spacing between the fluid circulation channel and the fluid ejection chamber is in a range of approximately 5 microns to approximately 11 microns, and the width of the fluid ejection chamber is in a range of approximately 14 microns to approximately 26 microns.

### Claim 17 (depends on 1)

A method of forming the fluid ejection device of claim 1, comprising:
communicating the fluid ejection chamber with the fluid slot;
providing the drop ejecting element in the fluid ejection chamber;
communicating the fluid circulation channel with the fluid slot and the fluid ejection chamber, including separating the fluid circulation channel and the fluid ejection chamber with the channel wall and forming the fluid circulation channel with the channel loop;
defining the width of the channel wall and the width of the channel loop based on the width of the fluid ejection chamber; and
providing the fluid circulating element in the fluid circulation channel.

### Claim 18 (depends on 17)

The method of claim 17, wherein the width of the channel wall is in a range of approximately 5 microns to approximately 11 microns, wherein the width of the channel loop is in a range of approximately 5 microns to approximately 16 microns, and wherein the width of the fluid ejection chamber is in a range of approximately 14 microns to approximately 26 microns.

### Claim 19 (depends on 18)

The method of claim 18, wherein the width of the channel wall is defined as CW=(42−CLW−ChW)/2, wherein CLW is a width of the channel loop, and ChW is a width of the fluid ejection chamber.

### Claim 20 (depends on 18)

The method of claim 18, wherein the width of the channel loop is defined as 42−2CW−ChW, wherein CW is the spacing between the fluid circulation channel and the fluid ejection chamber, and ChW is the width of the fluid ejection chamber.