Abstract: A jetting head control device supplies a non-printing oscillation voltage to which a non-printing oscillation waveform (342) is applied, to a nozzle in the non-printing period, and supplies a printing oscillation voltage to which a printing oscillation waveform (344) is applied, to a non-jetting nozzle that does not jet liquid in a printing period. In the non-printing oscillation waveform, a pulse width TW is (3/4)×TC<TW<(5/4)×TC in a case in which a natural period of a jetting head is denoted by TC, and an indicator of a total amount of oscillation in which a total amount of oscillation, which is an indicator of oscillation of an ink, is larger than a total amount of oscillation in the printing oscillation waveform is applied.

Abstract: Provided are a head device, an ink jet printing device, and a driving voltage adjustment method capable of adjusting a driving voltage corresponding to a target jetting amount and suppressing unevenness of printing density occurring between head modules. A dead device includes an ink jet head including a plurality of head modules, and a driving voltage supply device that includes a processor and supplies a driving voltage to the ink jet head, in which the processor acquires a module characteristic, acquires an ink characteristic of ink applied to printing, derives a first voltage coefficient for adjusting a driving voltage corresponding to a target jetting amount for each head module based on the module characteristic and the ink characteristic, and adjusts the driving voltage by applying the first voltage coefficient for each head module.

Abstract: A drive waveform creation method, an information processing apparatus, and a program that enable even a technician not having professional knowledge to efficiently create a drive waveform suitable for ejecting liquid to be used. A method of creating a drive waveform to be used for driving a piezoelectric element of a liquid ejection head including the piezoelectric element includes, via one or more processors, predicting flight of liquid to be ejected by the liquid ejection head in a case of inputting an unknown drive waveform using a machine learning model that is trained through machine learning using data related to an actual flight shape of the liquid in a case where each of a plurality of drive waveforms is applied to the piezoelectric element using the liquid and the liquid ejection head, and determining a drive waveform suitable for ejecting the liquid based on the prediction of the flight.

Abstract: A method of creating a head model that can accurately simulate behavior of a liquid ejection head, a drive waveform creation method of creating a proper drive waveform using the head model, and an information processing apparatus and a program for executing the methods are provided. Provided is a method of creating a head model that simulates behavior of a liquid ejection head including a piezoelectric element, the head model being configured using a fluid analysis model, the method including, via one or more first processors, optimizing the head model based on learning data using data related to an actual flight shape in a case of ejecting liquid by applying each of a plurality of drive waveforms to the piezoelectric element using the liquid ejection head and the liquid ejected from the liquid ejection head as the learning data.

Abstract: A drive waveform acquisition unit that acquires a drive waveform, a drive voltage generation unit that generates the drive voltage, a jetting frequency setting unit that sets a jetting frequency on the basis of drop velocity information representing a relationship between the jetting frequency and a drop velocity in a single-shot, and a drive voltage supply unit that supplies the drive voltage to the jetting head are included. The jetting frequency setting unit sets a jetting frequency at which the drop velocity is a second velocity equal to or less than a first velocity in the drop velocity information as the jetting frequency of the jetting head.

Abstract: Provided are a head device, an ink jet printing device, and a driving voltage adjustment method capable of adjusting a driving voltage corresponding to a target jetting amount and suppressing unevenness of printing density occurring between head modules. A dead device includes an ink jet head including a plurality of head modules, and a driving voltage supply device that includes a processor and supplies a driving voltage to the ink jet head, in which the processor acquires a module characteristic, acquires an ink characteristic of ink applied to printing, derives a first voltage coefficient for adjusting a driving voltage corresponding to a target jetting amount for each head module based on the module characteristic and the ink characteristic, and adjusts the driving voltage by applying the first voltage coefficient for each head module.

Abstract: A drive waveform acquisition unit that acquires a drive waveform; a drive voltage generation unit that generates a drive voltage; and a drive voltage supply unit that supplies the drive voltage are included. The drive waveform acquisition unit acquires an overflow waveform used to generate an overflow drive voltage. The drive voltage generation unit generates the overflow drive voltage including one or more overflow pulses corresponding to a period of 0.2 seconds or more and 90 seconds or less. The overflow pulses have a pulse width of 1.2 times or more and 1.8 times or less and an amplitude of 0.3 times or more and 0.8 times or less, and at least one of a rising period or a falling period of 0.3 times or less with respect to a jetting pulse.

Abstract: A drive waveform acquisition unit that acquires a drive waveform, a drive voltage generation unit that generates the drive voltage, a jetting frequency setting unit that sets a jetting frequency on the basis of drop velocity information representing a relationship between the jetting frequency and a drop velocity in a single-shot, and a drive voltage supply unit that supplies the drive voltage to the jetting head are included. The jetting frequency setting unit sets a jetting frequency at which the drop velocity is a second velocity equal to or less than a first velocity in the drop velocity information as the jetting frequency of the jetting head.

Abstract: A drive waveform acquisition unit that acquires a drive waveform; a drive voltage generation unit that generates a drive voltage; and a drive voltage supply unit that supplies the drive voltage are included. The drive waveform acquisition unit acquires an overflow waveform used to generate an overflow drive voltage. The drive voltage generation unit generates the overflow drive voltage including one or more overflow pulses corresponding to a period of 0.2 seconds or more and 90 seconds or less. The overflow pulses have a pulse width of 1.2 times or more and 1.8 times or less and an amplitude of 0.3 times or more and 0.8 times or less, and at least one of a rising period or a falling period of 0.3 times or less with respect to a jetting pulse.

Abstract: An image recording apparatus includes a recording head, a recording-position information obtaining unit configured to obtain recording position information of a plurality of recording elements a plurality of times at an interval of an arbitrary period, a recording-position chronological change information calculating unit configured to calculate chronological change information of the recording position for each recording element, a medium type specifying unit configured to specify a type of a medium using the chronological change information of the recording position for each recording element, and a parameter setting unit configured to automatically set at least either one of a recording parameter and an abnormality detection parameter in correspondence with the specified type of medium.

Abstract: An image recording apparatus includes a recording head, a recording-position information obtaining unit configured to obtain recording position information of a plurality of recording elements a plurality of times at an interval of an arbitrary period, a recording-position chronological change information calculating unit configured to calculate chronological change information of the recording position for each recording element, a medium type specifying unit configured to specify a type of a medium using the chronological change information of the recording position for each recording element, and a parameter setting unit configured to automatically set at least either one of a recording parameter and an abnormality detection parameter in correspondence with the specified type of medium.

Abstract: A drive apparatus for a liquid ejection head, includes a drive signal generating device for generating a drive signal to operate an ejection energy generating element provided so as to correspond to a nozzle of the liquid ejection head, the drive signal being supplied to the ejection energy generating element so that a liquid droplet is caused to be ejected from the nozzle, wherein: the drive signal includes a plurality of ejection pulses for performing a plurality of ejection operations during one recording period, in a remaining pulse sequence excluding a final pulse of the plurality of ejection pulses, a voltage amplitude of a subsequent pulse is smaller than a voltage amplitude of a preceding pulse, and the final pulse has a largest voltage amplitude, of the plurality of ejection pulses.

Abstract: A drive apparatus for a liquid ejection head, includes a drive signal generating device for generating a drive signal to operate an ejection energy generating element provided so as to correspond to a nozzle of the liquid ejection head, the drive signal being supplied to the ejection energy generating element so that a liquid droplet is caused to be ejected from the nozzle, wherein: the drive signal includes a plurality of ejection pulses for performing a plurality of ejection operations during one recording period, in a remaining pulse sequence excluding a final pulse of the plurality of ejection pulses, a voltage amplitude of a subsequent pulse is smaller than a voltage amplitude of a preceding pulse, and the final pulse has a largest voltage amplitude, of the plurality of ejection pulses.

Abstract: According to the present invention, the occurrence of an ejection abnormality can be determined at an early stage by using a waveform for abnormal nozzle determination, before an image defect producing a visible density non-uniformity (stripe non-uniformity) occurs due to an ejection defect in an output image recorded by a drive signal having a recording waveform. Consequently, recording stability and throughput can both be achieved.

Abstract: Present invention provide a driving device of a liquid discharging head, a liquid discharging apparatus, and an ink jet recording apparatus that are capable of realizing a desired dot shape by suppressing the generation of the meniscus without sacrificing the discharge efficiency or the landing accuracy. According to the present invention, in a case where discharging is performed a plurality of times in one recording period, and one pixel is recorded by using a plurality of droplets, by configuring the wave height change time of a rear-end side wave height change part of the final pulse of a plurality of discharge pulses to be equal to or longer than a quarter of the resonant period Tc and configuring the pulse width of the plurality of discharge pulses to be a half of the resonant period Tc.

Abstract: The droplet ejection head includes: a plurality of droplet ejection units which include ejection ports through which droplets of liquid are ejected, pressure chambers which are connected to the ejection ports through connection channels, drive elements which apply pressure to the liquid in the pressure chambers, supply channels through which the liquid is supplied to the pressure chambers, and return channels through which the liquid is returned from the connection channels; a common supply channel through which the liquid is supplied to the supply channels; and a common return channel through which the liquid is returned from the return channels, the common return channel including a stagnant flow region having a bubble collection section where bubbles are collected, wherein pressure variation occurring in each pressure chamber when ejecting a droplet of the liquid propagates more readily in the common return channel than in the common supply channel.

Abstract: In a droplet ejection head, each of droplet ejection units includes: a nozzle which ejects droplets of liquid, a pressure chamber which is filled with the liquid and connected to the nozzle, a drive element which applies pressure to the liquid inside the pressure chamber, and an individual supply channel and an individual recovery channel which are connected to the pressure chamber. The liquid is supplied to and recovered from the pressure chamber through the individual supply channel and the individual recovery channel. In each of the droplet ejection units, a diameter Dn (?m) of the nozzle, a flow channel resistance R1 (Ns/m5) of the individual supply channel and a flow channel resistance R2 (Ns/m5) of the individual recovery channel satisfy: 3.247×1015exp(?0.1717 Dn)?R1?3.278×1015exp(?0.1456 Dn); and 3.247×1015exp(?0.1717 Dn)?R2?3.278×1015exp(?0.1456 Dn).

Abstract: Present invention provide a driving device of a liquid discharging head, a liquid discharging apparatus, and an ink jet recording apparatus that are capable of realizing a desired dot shape by suppressing the generation of the meniscus without sacrificing the discharge efficiency or the landing accuracy. According to the present invention, in a case where discharging is performed a plurality of times in one recording period, and one pixel is recorded by using a plurality of droplets, by configuring the wave height change time of a rear-end side wave height change part of the final pulse of a plurality of discharge pulses to be equal to or longer than a quarter of the resonant period Tc and configuring the pulse width of the plurality of discharge pulses to be a half of the resonant period Tc.

Abstract: The inkjet recording apparatus includes: an abnormal nozzle detective waveform signal generating device which generates a drive signal having an abnormal nozzle detective waveform including a waveform that is different from a recording waveform and applied to pressure generating elements when performing ejection for abnormality detection to detect an abnormal nozzle among nozzles; an abnormal nozzle detective device which identifies the abnormal nozzle showing an ejection abnormality from results of the ejection for abnormality detection; a correction control device which corrects image data in such a manner that ejection is stopped from the identified abnormal nozzle and a desired image is recorded by the nozzles other than the abnormal nozzle; and a recording ejection control device which performs image recording by controlling ejection from the nozzles other than the abnormal nozzle in accordance with the image data that has been corrected by the correction control device.

Abstract: A drive apparatus for a liquid ejection head, includes a drive signal generating device for generating a drive signal to operate an ejection energy generating element provided so as to correspond to a nozzle of the liquid ejection head, the drive signal being supplied to the ejection energy generating element so that a liquid droplet is caused to be ejected from the nozzle, wherein: the drive signal includes a plurality of ejection pulses for performing a plurality of ejection operations during one recording period, in a remaining pulse sequence excluding a final pulse of the plurality of ejection pulses, a voltage amplitude of a subsequent pulse is smaller than a voltage amplitude of a preceding pulse, and the final pulse has a largest voltage amplitude, of the plurality of ejection pulses.