# US 11,077,659 B2 · Liquid ejecting apparatus and driving circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,077,659 B2 - Document ID: US11077659B2 - Status: Granted - Kind: B2 - Application number: 16/581,831 - Filed: 2019-09-25 - Published: 2020-04-02 - Granted: 2021-08-03 - Earliest claimed: 2018-09-27 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Tom Kashimura; Yuki Watanabe - Web page: https://patentgrep.com/patent/US11077659B2 ## CPC - B41J 2/14209: {of finger type, chamber walls consisting integrally of piezoelectric material} - B41J 2/04541: {Specific driving circuit} - B41J 2/04581: {controlling heads based on piezoelectric elements} - B41J 2/04593: {Dot-size modulation by changing the size of the drop} - B41J 2/14233: {of film type, deformed by bending and disposed on a diaphragm} - B41J 29/02: Framework - B41J 29/13: Cases or covers - B41J 29/377: Cooling or ventilating arrangements - B41J 2/04588: {using a specific waveform} - B41J 2002/14491: {Electrical connection} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract A liquid ejecting apparatus includes a liquid discharging head having a first nozzle and a first piezoelectric element, a first driving signal generating circuit, a substrate on which the first driving signal generating circuit is provided, a first wire, and a first coil, in which the first driving signal generating circuit generates a first driving signal, the first piezoelectric element is driven based on the first driving signal to discharge liquid from the first nozzle, and the first wire is electrically coupled to the first driving signal generating circuit and propagates the first driving signal to the first piezoelectric element through the first coil. ## Claims ### Claim 1 A liquid ejecting apparatus comprising: a liquid discharging head having a first nozzle and a first piezoelectric element; a first driving signal generating circuit; a substrate on which the first driving signal generating circuit is provided; a first wire; and a first coil, wherein the first driving signal generating circuit generates a first driving signal, the first piezoelectric element is driven based on the first driving signal to discharge liquid from the first nozzle, the first wire is a part of a first path that is electrically coupled to the first driving signal generating circuit and propagates the first driving signal to the first piezoelectric element through the first coil, and the first path contains the first coil having a first inductance and the first wire having a second inductance, and the first inductance is different from the second inductance. ### Claim 2 (depends on 1) The liquid ejecting apparatus according to claim 1, further comprising: a resistance element, wherein the first path propagates the first driving signal to the first piezoelectric element through the first coil and the resistance element. ### Claim 3 (depends on 1) The liquid ejecting apparatus according to claim 1, wherein the first coil is provided on the substrate, the first path contains one end which is electrically connected to the first drive signal generation circuit via the first coil and the other end which is electrically connected to the liquid discharge head. ### Claim 4 (depends on 1) The liquid ejecting apparatus according to claim 1, further comprising: a second driving signal generating circuit that generates a second driving signal; a second wire; and a second coil, wherein the liquid discharging head has a second nozzle and a second piezoelectric element, the second piezoelectric element is driven based on the second driving signal to discharge liquid from the second nozzle, the second wire is a part of a second path that is electrically coupled to the second driving signal generating circuit and propagates the second driving signal to the second piezoelectric element through the second coil, and the second path contains the second coil having a third inductance and the second wire having a fourth inductance, and the third inductance is different from the fourth inductance. ### Claim 5 (depends on 4) The liquid ejecting apparatus according to claim 4, wherein a waveform of the first driving signal is different from a waveform of the second driving signal, and the first inductance of the first coil is different from the third inductance of the second coil. ### Claim 6 (depends on 4) The liquid ejecting apparatus according to claim 4, further comprising: an output connector to which the first wire and the second wire are electrically coupled, wherein the second driving signal generating circuit and the output connector are provided on the substrate, a shortest distance between the first driving signal generating circuit and the output connector is smaller than a shortest distance between the second driving signal generating circuit and the output connector, and the first inductance of the first coil is larger than the third inductance of the second coil. ### Claim 7 (depends on 1) The liquid ejecting apparatus according to claim 1, further comprising: a head unit including the substrate on which the first driving signal generating circuit is provided and the liquid discharging head; and a discharge control circuit that generates a signal for controlling an operation of the head unit, wherein the head unit and the discharge control circuit are electrically coupled to each other through a cable. ### Claim 8 A driving circuit for driving a capacitive load, comprising: a first driving signal generating circuit; a substrate on which the first driving signal generating circuit is provided; a first wire; and a first coil, wherein the first driving signal generating circuit generates a first driving signal, the first wire is a part of a first path that is electrically coupled to the first driving signal generating circuit and propagates the first driving signal to the capacitive load through the first coil, and the first path contains the first coil having a first inductance and the first wire having a second inductance, and the first inductance is different from the second inductance.