# US 2019/0168512 A1 · 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 2019/0168512 A1 - Document ID: US20190168512A1 - Status: Published application - Kind: A1 - Application number: 16/270,664 - Filed: 2019-02-08 - Published: 2019-06-06 - Earliest claimed: 2017-07-27 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: Alexander Govyadinov; Tsuyoshi Yamashita; Erik D. Torniainen - Web page: https://patentgrep.com/patent/US20190168512A1 ## CPC - B41J 2/18: Ink recirculation systems - B41J 2/14016: {Structure of bubble jet print heads} - B41J 2/1404: {Geometrical characteristics} - B41J 2/14056: {Plural heating elements per ink chamber} - B41J 2/14153: {Structures including a sensor} - B41J 2/14201: {Structure of print heads with piezoelectric elements} - B41J 2/1607: {Production of print heads with piezoelectric elements (B41J2/1606, B41J2/162 take precedence)} - B41J 2/175: Ink supply systems {; Circuit parts therefor} - B41J 2002/14193: {movable member in the ink chamber} - B41J 2002/14354: {Sensor in each pressure chamber} - B41J 2002/14403: {including a filter} - 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 first fluid ejection chamber communicated with the fluid slot and including a first drop ejecting element, a second fluid ejection chamber including a second drop ejecting element, and a fluid circulation path including a first portion communicated with the fluid slot and the second fluid ejection chamber, and a second portion communicated with the first fluid ejection chamber and the second fluid ejection chamber, with the fluid circulation path including a fluid circulating element within the first portion. ## Claims ### Claim 1 A fluid ejection device, comprising: a fluid slot; a fluid circulation path having a first end in fluid communication with the fluid slot, and a second end in fluid communication with the fluid slot; a plurality of fluid ejection chambers arranged along the fluid circulation path and comprising respective drop ejecting elements; and a fluid circulating element in the fluid circulation path to induce a flow of circulating fluid in the fluid circulation path, wherein the fluid circulating element and the plurality of fluid ejection chambers are arranged in series in the fluid circulation path between the first and second ends of the fluid circulation path. ### Claim 2 (depends on 1) The fluid ejection device of claim 1, wherein the plurality of fluid ejection chambers include a first fluid ejection chamber comprising a first drop ejecting element, and a second fluid ejection chamber comprising a second drop ejecting element, the first drop ejecting element to cause ejection of a first fluid drop through a first fluid orifice, and the second drop ejecting element to cause ejection of a second fluid drop through a first fluid orifice. ### Claim 3 (depends on 2) The fluid ejection device of claim 2, wherein the first fluid orifice and the second fluid orifice have a same size. ### Claim 4 (depends on 2) The fluid ejection device of claim 2, wherein the first fluid drop and the second fluid droop ejected through the respective first fluid orifice and the second fluid orifice have a same weight. ### Claim 5 (depends on 1) The fluid ejection device of claim 1, wherein a first portion of the fluid circulation path is to circulate fluid in a first direction, and a second portion of the fluid circulation path is to circulate fluid in a second direction opposite the first direction. ### Claim 6 (depends on 5) The fluid ejection device of claim 5, wherein the first portion of the fluid circulation path comprises a first fluid ejection chamber of the plurality of fluid ejection chambers, and the second portion of the fluid circulation path comprises a second fluid ejection chamber of the plurality of fluid ejection chambers. ### Claim 7 (depends on 6) The fluid ejection device of claim 6, wherein the first portion of the fluid circulation path further comprises the fluid circulating element. ### Claim 8 (depends on 5) The fluid ejection device of claim 5, wherein the first portion of the fluid circulation path comprises multiple fluid ejection chambers of the plurality of fluid ejection chambers, and the second portion of the fluid circulation path comprises the fluid circulating element. ### Claim 9 (depends on 1) The fluid ejection device of claim 1, wherein the fluid circulation path includes a first segment including the fluid circulating element, a second segment including a fluid ejection chamber of the plurality of fluid ejection chambers, and a channel loop between the first and second segments. ### Claim 10 (depends on 1) The fluid ejection device of claim 1, wherein the fluid circulating element is separate from each of the plurality of fluid ejecting chambers. ### Claim 11 (depends on 1) The fluid ejection device of claim 1, wherein the plurality of fluid ejecting chambers comprise a first fluid ejecting chamber and a second fluid ejecting chamber, and the fluid ejection device further comprises a particle tolerant architecture in a portion of the fluid circulation path between the first and second fluid ejection chambers, the particle tolerant architecture comprising a structure to block a particle from flowing from the second fluid ejection chamber to the first fluid ejection chamber. ### Claim 12 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 first orifice through which a fluid drop is ejected in response to activation of the first drop ejecting element; a second fluid ejection chamber including a second drop ejecting element; a second orifice through which a fluid drop is ejected in response to activation of the second drop ejecting element, wherein the second orifice has a same size as the first orifice; and a fluid circulation path having a first end communicated with the fluid slot, and a second end communicated with the fluid slot, the fluid circulation path including a fluid circulating element to induce a flow of circulating fluid in the fluid circulation path, wherein the fluid circulating element, the first fluid ejection chamber, and the second fluid ejection chamber are arranged in series in the fluid circulation path between the first and second ends of the fluid circulation path. ### Claim 13 (depends on 12) The fluid ejection device of claim 12, wherein the fluid circulation path is to circulate fluid in a first direction between the fluid circulating element and the second fluid ejection chamber, and the fluid circulation path is to circulate fluid in a second direction opposite the first direction between the second fluid ejection chamber and the first fluid ejection chamber. ### Claim 14 (depends on 12) The fluid ejection device of claim 12, wherein the fluid circulation path includes a first portion extended between the fluid slot and the second fluid ejection chamber, and a second portion extended between the second fluid ejection chamber and the first fluid ejection chamber. ### Claim 15 (depends on 12) The fluid ejection device of claim 12, further comprising: a particle tolerant architecture within the fluid circulation path between the first fluid ejection chamber and the second fluid ejection chamber. ### Claim 16 A method of forming a fluid ejection device, comprising: defining a plurality of fluid ejection chambers having respective drop ejecting elements; defining a fluid circulation path having a fluid circulating element; communicating a first end and a second end of the fluid circulation path with a fluid slot; and arranging the fluid circulating element and the plurality of fluid ejection chambers in series in the fluid circulation path between the first and second ends of the fluid circulation path. ### Claim 17 (depends on 16) The method of claim 16, further comprising: forming a channel loop in the fluid circulation path between a first fluid circulation path segment including the fluid circulating element, and a second fluid circulation path segment including a fluid ejection chamber of the plurality of fluid ejection chambers. ### Claim 18 (depends on 16) The method of claim 16, wherein the plurality of fluid ejection chambers include a first fluid ejection chamber comprising a first drop ejecting element, and a second fluid ejection chamber comprising a second drop ejecting element, the first drop ejecting element to cause ejection of a first fluid drop through a first fluid orifice, and the second drop ejecting element to cause ejection of a second fluid drop through a first fluid orifice. ### Claim 19 (depends on 18) The method of claim 18, wherein the first fluid orifice and the second fluid orifice have a same size. ### Claim 20 (depends on 18) The method of claim 18, wherein the first fluid drop and the second fluid droop ejected through the respective first fluid orifice and the second fluid orifice have a same weight.