# US 10,864,734 B2 · Inkjet head and inkjet printer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,864,734 B2 - Document ID: US10864734B2 - Status: Granted - Kind: B2 - Application number: 16/407,230 - Filed: 2019-05-09 - Published: 2019-11-28 - Granted: 2020-12-15 - Earliest claimed: 2018-05-23 - Assignees: Toshiba Tec Kabushiki Kaisha - Applicants: Toshiba Tec Kabushiki Kaisha - Inventors: Masashi Seki - Web page: https://patentgrep.com/patent/US10864734B2 ## CPC - B41J 2/1606: {Coating the nozzle area or the ink chamber} - B41J 2/045: by pressure, e.g. electromechanical transducers - B41J 2/04581: {controlling heads based on piezoelectric elements} - B41J 2/055: Devices for absorbing or preventing back-pressure - B41J 2/14233: {of film type, deformed by bending and disposed on a diaphragm} - B41J 2/165: Prevention {or detection} of nozzle clogging, e.g. cleaning, capping or moistening for nozzles - B41J 2/16502: {Printhead constructions to prevent nozzle clogging or facilitate nozzle cleaning} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract According to one embodiment, an inkjet head achieving excellent landing accuracy and an inkjet printer including such an inkjet head are provided. An inkjet head according to one embodiment includes a nozzle plate provided with a nozzle that ejects an ink having a surface tension within a range of 20 to 30 mN/m to a recording medium. The nozzle plate includes a nozzle plate substrate and a fluid repellent film provided on a face opposed to the recording medium of the nozzle plate substrate, and the fluid repellent film contains a fluorine-based compound having a terminal perfluoroalkyl group with 7 or less carbon atoms, and has a static contact angle with pure water within a range of 100° to 120°. ## Claims ### Claim 1 An inkjet head, comprising a nozzle plate provided with a nozzle that ejects an ink having a surface tension from 20 mN/m to 30 mN/m to a recording medium, wherein the nozzle plate includes a nozzle plate substrate and a fluid repellent film provided on a face opposed to the recording medium of the nozzle plate substrate, and the fluid repellent film comprises a fluorine-based compound having a terminal perfluoroalkyl group with 7 or less carbon atoms, and has a static contact angle with pure water from 100° to 120°. ### Claim 2 (depends on 1) The head according to claim 1, wherein the surface tension of the ink is from 20 mN/m to 26 mN/m. ### Claim 3 (depends on 1) The head according to claim 1, wherein the terminal perfluoroalkyl group of the fluorine-based compound has 5 or less carbon atoms. ### Claim 4 (depends on 1) The head according to claim 1, wherein the terminal perfluoroalkyl group of the fluorine-based compound has 3 or 4 carbon atoms. ### Claim 5 (depends on 1) The head according to claim 1, wherein the nozzle plate substrate comprises a resin. ### Claim 6 (depends on 1) The head according to claim 1, wherein of the fluorine-based compound comprises a binding moiety and the terminal perfluoroalkyl group. ### Claim 7 (depends on 6) The head according to claim 6, wherein the fluorine-based compound further comprises a spacer linking group between the binding moiety and the terminal perfluoroalkyl group. ### Claim 8 An inkjet printer, comprising: an inkjet head comprising a nozzle plate provided with a nozzle that ejects an ink having a surface tension from 20 mN/m to 30 mN/m to a recording medium, wherein the nozzle plate includes a nozzle plate substrate and a fluid repellent film provided on a face opposed to the recording medium of the nozzle plate substrate, and the fluid repellent film comprises a fluorine-based compound having a terminal perfluoroalkyl group with 7 or less carbon atoms, and has a static contact angle with pure water from 100° to 120°; and a medium holding mechanism that holds a recording medium opposed to the inkjet head. ### Claim 9 (depends on 8) The printer according to claim 8, wherein the surface tension of the ink is from 20 mN/m to 26 mN/m. ### Claim 10 (depends on 8) The printer according to claim 8, wherein the terminal perfluoroalkyl group of the fluorine-based compound has 5 or less carbon atoms. ### Claim 11 (depends on 8) The printer according to claim 8, wherein the terminal perfluoroalkyl group of the fluorine-based compound has 3 or 4 carbon atoms. ### Claim 12 (depends on 8) The printer according to claim 8, wherein the nozzle plate substrate comprises a resin. ### Claim 13 (depends on 8) The printer according to claim 8, wherein of the fluorine-based compound comprises a binding moiety and the terminal perfluoroalkyl group. ### Claim 14 (depends on 13) The printer according to claim 13, wherein the fluorine-based compound further comprises a spacer linking group between the binding moiety and the terminal perfluoroalkyl group. ### Claim 15 An inkjet printing method, comprising: ejecting ink through a nozzle plate to a recording medium, the ink having a surface tension from 20 mN/m to 30 mN/m; the nozzle plate including a nozzle plate substrate and a fluid repellent film provided on a face opposed to the recording medium of the nozzle plate substrate, the fluid repellent film comprising a fluorine-based compound having a terminal perfluoroalkyl group with 7 or less carbon atoms, and having a static contact angle with pure water from 100° to 120°. ### Claim 16 (depends on 15) The method according to claim 15, wherein the surface tension of the ink is from 20 mN/m to 26 mN/m. ### Claim 17 (depends on 15) The method according to claim 15, wherein the terminal perfluoroalkyl group of the fluorine-based compound has 5 or less carbon atoms. ### Claim 18 (depends on 15) The method according to claim 15, wherein the terminal perfluoroalkyl group of the fluorine-based compound has 3 or 4 carbon atoms. ### Claim 19 (depends on 15) The method according to claim 15, wherein the nozzle plate substrate comprises a resin. ### Claim 20 (depends on 15) The method according to claim 15, wherein of the fluorine-based compound comprises a binding moiety and the terminal perfluoroalkyl group.