# US 10,308,020 B2 · Fluid ejection device

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- Number: US 10,308,020 B2
- Document ID: US10308020B2
- Status: Granted
- Kind: B2
- Application number: 15/747,835
- Filed: 2015-10-27
- Published: 2018-08-02
- Granted: 2019-06-04
- Earliest claimed: 2015-10-27
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Hewlett-Packard Development Company, L.P.
- Inventors: Alexander Govyadinov; Tsuyoshi Yamashita; Erik D. Torniainen; Nicholas McGuinness; David P. Markel
- Web page: https://patentgrep.com/patent/US10308020B2

## CPC

- B41J 2/14016: {Structure of bubble jet print heads}
- B41J 2/1404: {Geometrical characteristics}
- B41J 2/14056: {Plural heating elements per ink chamber}
- B41J 2002/14467: {Multiple feed channels per ink chamber}
- B41J 2202/11: characterised by specific geometrical characteristics
- 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 first fluid ejection chamber communicated with the fluid slot and including a first drop ejecting element, a second fluid ejection chamber communicated with the fluid slot and including a second drop ejecting element, a fluid circulation path communicated with the first fluid ejection chamber and the second fluid ejection chamber, and a fluid circulating element within the fluid circulation path.

## Claims

### Claim 1

A fluid ejection device, comprising:
a fluid slot;
a first fluid ejection chamber communicated with the fluid slot and including a first drop ejecting element;
a second fluid ejection chamber communicated with the fluid slot and including a second drop ejecting element;
a fluid circulation path communicated with the first fluid ejection chamber and the second fluid ejection chamber, wherein the fluid circulation path includes a first portion communicated with the first fluid ejection chamber, a second portion communicated with the second fluid ejection chamber, and a channel loop between the first portion and the second portion, wherein the first portion of the fluid circulation path is to direct fluid in a first direction, and the second portion of the fluid circulation path is to direct fluid in a second direction opposite the first direction; and
a fluid circulating element within the fluid circulation path.

### Claim 2 (depends on 1)

The fluid ejection device of claim 1, wherein the fluid circulating element is within the first portion of the fluid circulation path, and a fluid flow distance between the fluid circulating element and the first fluid ejection chamber is less than a fluid flow distance between the fluid circulating element and the second fluid ejection chamber.

### Claim 3 (depends on 1)

The fluid ejection device of claim 1, wherein the fluid circulating element is within the second portion of the fluid circulation path, and a fluid flow distance between the fluid circulating element and the second fluid ejection chamber is less than a fluid flow distance between the fluid circulating element and the first fluid ejection chamber.

### Claim 4 (depends on 1)

The fluid ejection device of claim 1, wherein the first fluid ejection chamber has a first end communicated with the fluid slot and a second end opposite the first end communicated with the fluid circulation path, and the second fluid ejection chamber has a first end communicated with the fluid slot and a second end opposite the first end communicated with the fluid circulation path.

### Claim 5

A fluid ejection device, comprising:
a fluid slot;
a first fluid ejection chamber communicated with the fluid slot;
a first drop ejecting element within the first fluid ejection chamber;
a second fluid ejection chamber communicated with the fluid slot;
a second drop ejecting element within the second fluid ejection chamber;
a fluid circulation path communicated at a first end with the first fluid ejection chamber and communicated at a second end with the second fluid ejection chamber, wherein the fluid circulation path is to direct fluid in a first direction between the first fluid ejection chamber and the second fluid ejection chamber and in a second direction opposite the first direction between the first fluid ejection chamber and the second fluid ejection chamber; and
a fluid circulating element within the fluid circulation path.

### Claim 6 (depends on 5)

The fluid ejection device of claim 5, wherein the fluid circulation path includes a channel loop, a first portion extended between the first fluid ejection chamber and the channel loop, and a second portion extended between the second fluid ejection chamber and the channel loop.

### Claim 7 (depends on 6)

The fluid ejection device of claim 6, wherein the fluid circulation path is to direct fluid in a first direction between the first fluid ejection chamber and the channel loop and in a second direction opposite the first direction between the channel loop and the second fluid ejection chamber.

### Claim 8 (depends on 5)

The fluid ejection device of claim 5, further comprising:
an object tolerant architecture within the fluid circulation path between the first drop ejecting element and the fluid circulating element.

### Claim 9

A method of forming a fluid ejection device, comprising:
defining a first fluid ejection chamber having a first drop ejecting element;
defining a second fluid ejection chamber having a second drop ejecting element;
defining a fluid circulation path having a fluid circulating element, wherein defining the fluid circulation path includes providing the fluid circulating element within the second portion of the fluid circulation path;
communicating the first fluid ejection chamber and the second fluid ejection chamber with a fluid slot;
communicating a first portion of the fluid circulation path with the first fluid ejection chamber; and
communicating a second portion of the fluid circulation path with the second fluid ejection chamber.

### Claim 10 (depends on 9)

The method of claim 9, wherein defining the fluid circulation path includes providing the fluid circulating element within the first portion of the fluid circulation path.

### Claim 11 (depends on 9)

The method of claim 9, wherein communicating the first portion of the fluid circulation path and communicating the second portion of the fluid circulation path includes orienting at least a length of the second portion of the fluid circulation path substantially parallel with at least a length of the first portion of the fluid circulation path.

### Claim 12 (depends on 1)

The fluid ejection device of claim 1, wherein the fluid slot is to provide the fluid to the first fluid ejection chamber, the first drop ejecting element, the second fluid ejection chamber, and the second drop ejecting element.

### Claim 13 (depends on 1)

The fluid ejection device of claim 1, wherein the fluid circulates through the fluid circulation path, the first fluid ejection chamber, and the second fluid ejection chamber based on flow induced by the fluid circulating element.

### Claim 14 (depends on 1)

The fluid ejection device of claim 1, wherein the channel loop comprises a substantially U-shaped portion of the fluid circulation path such that at least a portion of a length of the first portion and at least a portion of a length of the second portion are spaced from and oriented substantially parallel with each other.

### Claim 15 (depends on 1)

The fluid ejection device of claim 1, wherein a width and length of the first portion are respectively equal to a width and length of the second portion.

### Claim 16 (depends on 1)

The fluid ejection device of claim 1, wherein a width and length of the first portion are respectively unequal to a width and length of the second portion.

### Claim 17 (depends on 1)

The fluid ejection device of claim 1, wherein a width of the first portion is less than a width of the first fluid ejection chamber, and a width of the second portion is less than a width of the second fluid ejection chamber.

### Claim 18 (depends on 6)

The fluid ejection device of claim 6, wherein a length of the first portion is greater than a length of the second portion.

### Claim 19 (depends on 6)

The fluid ejection device of claim 6, wherein any of the first portion and the second portion comprises a narrowed width portion between the first fluid ejection chamber and the second fluid ejection chamber.

### Claim 20 (depends on 6)

The fluid ejection device of claim 6, wherein any of (i) the first portion comprises a first narrowed width portion between the fluid circulating element and the first fluid ejection chamber, and (ii) the second portion comprises a second narrowed width portion between the fluid circulating element and the second fluid ejection chamber.