Abstract: A liquid ejecting head includes a fixing plate, a holder stacked in a first direction on the fixing plate and having a first surface, and an adhesive that adheres the fixing plate to the first surface, in which the first surface has an adhesive region in contact with the adhesive, a first line segment in the adhesive region is longer than a second line segment in the adhesive region, a region of the first surface that overlaps the first line segment has first adhesive regions and a first recess, and a region of the adhesive region that overlaps the second line segment has a distance in the first direction from the fixing plate that is greater than a distance in the first direction between the fixing plate and the first adhesive region.

Abstract: An evaluation control portion, in which the evaluation control portion causes the detection circuit to detect, as first residual vibration, residual vibration caused by continuously performing jetting driving in which the piezoelectric element is driven with a vibration pulse for generating, at the vibration plate, vibration larger than vibration of the vibration plate caused by non-jetting driving in which the piezoelectric element is driven with a minute vibration pulse for not jetting an ink from the nozzle, causes the detection circuit to detect, as second residual vibration, residual vibration caused by continuously driving the piezoelectric element in order of the non-jetting driving and the jetting driving, and evaluates a variation in a jetting characteristic of the nozzle between a case where the jetting driving is continuous and a case where the jetting driving is not continuous based on the first residual vibration and the second residual vibration.

Abstract: A liquid ejecting apparatus includes a liquid ejection head, a circulation control section that controls a circulation operation of circulating the liquid in the first individual flow path, and a minute vibration control section that supplies a drive signal having a first waveform to the first piezoelectric element so as to control a minute vibration operation of causing the liquid in the first nozzle to vibrate to such a degree that the liquid is not ejected from the first nozzle. The circulation control section starts the circulation operation at a first time, and the minute vibration control section starts the minute vibration operation at a second time later than the first time.

Abstract: A liquid ejecting apparatus includes a liquid ejecting head that includes a detection circuit which detects residual vibration of a diaphragm caused by driving of at least one of a first piezoelectric element and a second piezoelectric element corresponding to nozzles, and an evaluation control portion, in which the evaluation control portion causes the detection circuit to detect first residual vibration caused by driving the first piezoelectric element and the second piezoelectric element with a drive signal for ejecting an ink, from the first piezoelectric element, causes the detection circuit to detect second residual vibration caused by driving the first piezoelectric element with the drive signal and driving the second piezoelectric element with another drive signal for not ejecting the ink, from the first piezoelectric element, and evaluates crosstalk between the nozzles based on the first residual vibration and the second residual vibration detected by the detection circuit.

Abstract: A liquid ejecting head includes head modules to eject a liquid in a first direction, and a metallic holder to which the head modules are fixed in a detachably-attached manner. Each of the head modules includes a metallic channel orifice forming member in which a channel is defined, and which includes a first alignment portion. The holder includes second alignment portions which are inserted into or receive the first alignment portions, respectively, in a press-fit manner, positioning the head modules with respect to the holder. A channel orifice formed in the holder to make a channel-forming connection to each of the head modules and a channel orifice formed in the head module to make the channel-forming connection to the holder coincide with each other as viewed in a direction in which either of the first alignment portions and the second alignment portions are press-fitted into the other alignment portions.

Abstract: In a method of manufacturing a liquid ejecting head including a plurality of head modules each having a chip including at least a nozzle plate in which a plurality of nozzles is formed and a flow path opening forming member, and a holder holding the plurality of head modules, the method includes a first positioning step of optically positioning the nozzle plate and the flow path opening forming member with reference to the nozzles, and a second positioning step of positioning the head module and the holder by press fitting one of a first positioning portion of the flow path opening forming member and a second positioning portion of the holder into the other of first positioning portion and the second positioning portion.

Abstract: A liquid ejecting head includes a head module configured to eject a liquid in a first direction, a supply channel member, and an elastic seal member that is arranged between the head module and the supply channel member in the first direction, thereby liquid-tightly connecting a first channel orifice of the first head module and a channel orifice of the supply channel member. The head module includes a channel orifice forming member in which the first channel orifice is formed, and a chip that is arranged in the first direction relative to the channel orifice forming member. A seal area of the seal member held between the channel orifice forming member and the supply channel member does not overlap the chip as viewed in the first direction.

Abstract: A liquid ejecting head includes multiple head modules to eject a liquid in a first direction, multiple metallic sub-holders each holding at least one of the head modules, and a metallic holder to which the multiple sub-holders are fixed in a detachably-attached manner. Each sub-holder includes a first alignment portion. The holder includes multiple second alignment portions each of which is inserted into or receives one of the first alignment portions, thereby positioning the multiple sub-holders with respect to the holder.

Abstract: A liquid ejecting apparatus includes a liquid ejecting head that includes a nozzle which ejects an ink, a piezoelectric element which corresponds to the nozzle, a diaphragm which vibrates by driving the piezoelectric element, and a detection circuit which detects residual vibration of the diaphragm caused by driving the piezoelectric element, and an evaluation control portion which executes first evaluation for evaluating an ejection stability of the ink from the nozzle, in which in the first evaluation, the evaluation control portion causes the detection circuit to detect the residual vibration caused by continuously executing ejection driving of driving the piezoelectric element with a drive signal for ejecting the ink from the nozzle as first residual vibration, and evaluates the ejection stability of the ink from the nozzle based on the first residual vibration detected by the detection circuit.

Abstract: A liquid ejecting apparatus includes: nozzles; individual flow paths communicating with each of the nozzles; a liquid storage portion storing liquid; a supply flow path for supplying the liquid from the liquid storage portion to the individual flow paths; a recovery flow path for recovering the liquid from the individual flow paths to the liquid storage portion; a bypass flow path that couples the supply flow path and the recovery flow path; and an on-off valve configured to close and open the recovery flow path, in which the on-off valve is disposed between the bypass flow path and the liquid storage portion in the recovery flow path, and a pressurization discharge operation of discharging the liquid from each of the nozzles by pressurizing the liquid in the supply flow path in a state in which the recovery flow path is closed by the on-off valve is executed.

Abstract: A liquid ejecting system includes a liquid ejecting head, a transmission control portion, and a reception control portion. The liquid ejecting head includes a nozzle, a piezoelectric element that is driven by a drive signal being supplied, a diaphragm that vibrates by driving the piezoelectric element, a pressure chamber which is filled with an ink and to which a pressure for ejecting the ink from the nozzle is applied by the vibration of the diaphragm, and a detection circuit that detects residual vibration of the diaphragm after the piezoelectric element is driven. The transmission control portion transmits residual vibration information indicating the residual vibration detected by the detection circuit to a server. The reception control portion receives adjustment information for adjusting a waveform of the drive signal, which is generated based on the residual vibration indicated by the residual vibration information, from the server.

Abstract: A liquid ejecting apparatus includes a pump that applies a pressure for supplying the ink to the common flow path to the common flow path, a pump that applies a pressure for discharging the ink from the other common flow path to the other common flow path, a detection circuit that detects residual vibration in the pressure chamber after applying a voltage to the piezoelectric element, and a circulation control portion that determines the pressure for supplying the ink and the pressure for discharging the ink based on the residual vibration detected by the detection circuit.

Abstract: A liquid ejecting apparatus includes: a first head disposed such that an arrangement angle is a first angle; a second head disposed such that an arrangement angle is a second angle, which is greater than the first angle; a first circulation mechanism circulating liquid between a first reservoir and the first head; a second circulation mechanism circulating liquid between a second reservoir and the second head; and a control unit controlling the first and the second circulation mechanisms. The control unit performs circulation cleaning, in which the liquid is circulated, on multiple heads including the first head and the second head. The amount of the liquid circulating through the first head during the circulation cleaning is a first amount, and the amount of the liquid circulating through the second head during the circulation cleaning is a second amount that is greater than the first amount.

Abstract: A liquid ejecting apparatus includes a liquid ejection head, a circulation control section that controls a circulation operation of circulating the liquid in the first individual flow path, and a minute vibration control section that supplies a drive signal having a first waveform to the first piezoelectric element so as to control a minute vibration operation of causing the liquid in the first nozzle to vibrate to such a degree that the liquid is not ejected from the first nozzle. The circulation control section starts the circulation operation at a first time, and the minute vibration control section starts the minute vibration operation at a second time earlier than the first time.

Abstract: A liquid ejecting apparatus includes a determination unit that determines an ejection state of the nozzle based on residual vibration generated in the pressure chamber after a voltage is applied to the piezoelectric element, a circulation mechanism that circulates the ink from the common flow path to the other common flow path via the plurality of individual flow paths, and a recovery control portion that executes a recovery process of recovering the ejection state of the nozzle to a normal state by controlling the circulation mechanism when the ejection state of the nozzle has an abnormality. The recovery control portion executes different processes according to a type of the abnormality determined by the determination unit as the recovery process.

Abstract: A liquid ejecting head includes: a head chip; a fixing plate having a first surface facing in an ejection direction, a second surface that is opposite from the first surface, and a lateral surface; and a holder configured to hold the head chip between itself and the fixing plate. In a plan view as seen toward the first surface, the first surface includes a water repellent region having water repellency, and a hydrophilic region that is disposed between the water repellent region and the lateral surface, and has lower water repellency than the water repellent region, and part of mold is bonded to the hydrophilic region of the first surface, the mold being disposed between the lateral surface and at least one of the head chip or the holder.

Abstract: A liquid ejecting apparatus includes a liquid ejection head, a supply tank, a recovery tank, a supply flow path, a recovery flow path, a pressurizing mechanism pressurizing the inside of the supply tank, and a depressurizing mechanism depressurizing the inside of the recovery tank. A filling period, in which a filling process is performed to fill, with the liquid, a nozzle, the supply flow path, and the recovery flow path, includes a period that is after a meniscus is formed in the nozzle and before the liquid reaches the recovery flow path. In the period, the pressurizing and the depressurizing mechanisms are driven; and in the period, Pt_out>?|Pm| is satisfied, where Pm indicates a pressure at which the meniscus is broken and Pt_out indicates a pressure in the recovery tank.

Abstract: A liquid ejecting head includes an introduction portion for introducing a gas supplied, a discharge portion for discharging the gas, and drive circuits provided in each of head chips, in which the drive circuits include a first drive circuit for driving the first head chip and a second drive circuit for driving the second head chip, a gas path through which the gas flows from the introduction portion to the discharge portion includes a first path coupled to the introduction portion, a second path coupled to the discharge portion, a first branch path coupling the first path and the second path, and a second branch path coupling the first path and the second path so as not to pass through the first branch path, the first drive circuit is disposed in the first branch path, and the second drive circuit is disposed in the second branch path.

Abstract: There is provided a head chip including: a first-nozzle; a second-nozzle; a first-pressure-chamber communicating with the first-nozzle; a second-pressure-chamber communicating with the first-nozzle; a third-pressure-chamber communicating with the second-nozzle; a fourth-pressure-chamber communicating with the second-nozzle; a first-piezoelectric-body generating a pressure in the first-pressure-chamber; a second-piezoelectric-body generating a pressure in the second-pressure-chamber; a third-piezoelectric-body generating a pressure in the third-pressure-chamber; a fourth-piezoelectric-body generating a pressure in the fourth-pressure-chamber; a first-individual-electrode coupled to the first-piezoelectric-body; a second-individual-electrode coupled to the second-piezoelectric-body; a third-individual electrode coupled to the third-piezoelectric-body; a fourth-individual-electrode coupled to the fourth-piezoelectric-body; a first-common-electrode commonly coupled to the first-piezoelectric-body and the third-pi

Abstract: an adhesive having a first amount exists on a side of the first piezoelectric element line, of a joint of the wiring substrate and the pressure chamber substrate or the vibration plate, an adhesive having a second amount that is larger than the first amount exists on a side of the second piezoelectric element line of the wiring substrate, of the joint, and a first discharging element related to the first piezoelectric element line is different from a second discharging element related to the second piezoelectric element line.