# US 11,027,547 B2 · Liquid ejection head > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,027,547 B2 - Document ID: US11027547B2 - Status: Granted - Kind: B2 - Application number: 16/779,081 - Filed: 2020-01-31 - Published: 2020-08-06 - Granted: 2021-06-08 - Earliest claimed: 2019-02-04 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Yusuke Hashimoto; Kenji Fujii; Hiroyuki Murayama - Web page: https://patentgrep.com/patent/US11027547B2 ## CPC - B41J 2/1404: {Geometrical characteristics} - B41J 2/14: Structure thereof {only for on-demand ink jet heads} - B41J 2/1603: {of the front shooter type} - B41J 2/1628: {dry etching} - B41J 2/1629: {wet etching} - B41J 2/1631: {photolithography} - B41J 2/1634: {laser machining} - B41J 2/1635: {dividing the wafer into individual chips} - B41J 2/1645: {thin film formation by spincoating} - B41J 2002/14403: {including a filter} - B41J 2002/14475: {characterised by nozzle shapes or number of orifices per chamber} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract A liquid ejection head includes a substrate, an ejection orifice forming member having a plurality of ejection orifices for ejecting a liquid, and an intermediate layer provided between the substrate and the ejection orifice forming member. The substrate has a supply path for supplying the liquid to the plurality of ejection orifices, the ejection orifice forming member has a common liquid chamber communicating with the plurality of ejection orifices, the supply path and the common liquid chamber communicate with each other via a filter portion including a plurality of holes formed in the intermediate layer, the ejection orifice forming member has a wall portion that protrudes into the common liquid chamber at a position opposed to the filter portion, and the wall portion extends along a direction intersecting an arrangement direction of the plurality of ejection orifices. ## Claims ### Claim 1 A liquid ejection head comprising: a substrate; an ejection orifice forming member having a plurality of ejection orifices for ejecting a liquid; and an intermediate layer provided between the substrate and the ejection orifice forming member, wherein the substrate has a supply path for supplying the liquid to the plurality of ejection orifices, the ejection orifice forming member has a common liquid chamber communicating with the plurality of ejection orifices, the supply path and the common liquid chamber communicate with each other via a filter portion including a plurality of holes formed in the intermediate layer, the ejection orifice forming member has a wall portion that protrudes into the common liquid chamber at a position opposed to the filter portion, the wall portion extends along a direction intersecting an arrangement direction of the plurality of ejection orifices, and the wall portion is formed at the position overlapping with the plurality of holes when viewed from a direction perpendicular to the face of the supply path side of the filter portion. ### Claim 2 (depends on 1) The liquid ejection head according to claim 1, wherein the wall portion abuts on the filter portion. ### Claim 3 (depends on 1) The liquid ejection head according to claim 1, wherein the wall portion has an end portion facing a flow path that allows the common liquid chamber to communicate with the ejection orifice. ### Claim 4 (depends on 3) The liquid ejection head according to claim 3, wherein the end portion of the wall portion has a shape a width of which decreases toward the flow path when viewed from a liquid ejection direction. ### Claim 5 (depends on 1) The liquid ejection head according to claim 1, wherein the ejection orifice forming member has a plurality of the wall portions. ### Claim 6 (depends on 5) The liquid ejection head according to claim 5, wherein the common liquid chamber is located between two parallel ejection orifice rows having the plurality of ejection orifices, and the plurality of wall portions are disposed on both sides of a center line of the common liquid chamber along the arrangement direction. ### Claim 7 (depends on 6) The liquid ejection head according to claim 6, wherein the plurality of wall portions are disposed asymmetrically with respect to the center line when viewed from a liquid ejection direction. ### Claim 8 (depends on 5) The liquid ejection head according to claim 5, wherein a relationship of G≥2F is satisfied, where F is an interval between the plurality of ejection orifices and G is an interval between the plurality of wall portions in the arrangement direction. ### Claim 9 (depends on 1) The liquid ejection head according to claim 1, wherein a relationship of D>E is satisfied, where D is a diameter of the ejection orifices and E is a diameter of the holes of the filter portion. ### Claim 10 (depends on 9) The liquid ejection head according to claim 9, wherein the plurality of holes of the filter portion satisfy a relationship of L>E/2, where L is an interval between two adjacent holes. ### Claim 11 (depends on 10) The liquid ejection head according to claim 10, wherein the plurality of holes are disposed in a triangular lattice shape so that centers of three adjacent holes are located at apexes of an equilateral triangle. ### Claim 12 (depends on 1) The liquid ejection head according to claim 1, wherein each of the filter portion and the wall portion is formed of an organic resin. ### Claim 13 (depends on 1) The liquid ejection head according to claim 1, wherein the substrate is formed of silicon, the filter portion is formed of a polyether amide resin, and the wall portion is formed of an epoxy resin. ### Claim 14 (depends on 1) The liquid ejection head according to claim 1, wherein a plurality of the wall portions are provided in a direction intersecting the arrangement direction of the plurality of ejection orifices. ### Claim 15 (depends on 1) The liquid ejection head according to claim 1, wherein the arrangement direction of the plurality of ejection orifices is along a longitudinal direction of an opening of the common liquid chamber.