Drive Waveform Patents (Class 347/10)
  • Patent number: 11220104
    Abstract: In an example implementation, a method of reducing inkjet aerosol in a fluid drop ejection system includes imaging fluid drops from an ejection event as the drops travel from an ejection nozzle toward a substrate, determining the momentum of each fluid drop from the imaging, comparing the momentum of each fluid drop with a threshold momentum, and determining that a fluid drop will become aerosol when its momentum does not exceed the threshold momentum.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: January 11, 2022
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Steven Michael Krause, James Feinn, Hector Jose Lebron
  • Patent number: 11181859
    Abstract: Method and devices for calibrating optical density reflective color fluids to be deposited on substrate are disclosed. Some methods comprise depositing a quantity of a keying color fluid on a first region of the substrate; applying a voltage level to a reflective color fluid application device; depositing, in response to the voltage level applied, a quantity of reflective color fluid on the first region of the substrate and on a second region of the substrate; performing reflectance measurements of the first region and of the second region; performing optical density calculations as a function of the reflectance measurements; varying the voltage level applied to the reflective color fluid application device in response to said optical density calculation until the optical density calculation is within a calibrated range of optical densities.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: November 23, 2021
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Gilad Noy, Noam Parvin, Vered Maagan
  • Patent number: 11184504
    Abstract: A printing system is disclosed. The printing system includes a printer to print image data to a medium and a print controller including a halftone calibration module to dynamically generate calibrated halftones to compensate for optical density changes that occur at the printer.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: November 23, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Mikel Stanich, Nikita Gurudath, Larry Ernst, Walter F. Kailey
  • Patent number: 11161341
    Abstract: An inkjet printing system includes an inkjet head including first to n-th nozzles disposed in a row in a first direction, where the inkjet head discharges an ink onto a pixel printing target substrate, a transfer part which transfers the pixel printing target substrate toward the inkjet head in a second direction perpendicular to the first direction, a discharge waveform signal generator which generates different discharge waveform signals based on a pixel interval in the pixel printing target substrate and a transferring speed of the pixel printing target substrate, and a discharge waveform signal selector which selects first to n-th discharge waveform signals among the plurality of different discharge waveform signals based on discharge position error data respectively corresponding to the first to n-th nozzles, such that the first to n-th discharge waveform signals are selectively provided to each of the first to n-th nozzles.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: November 2, 2021
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Hong Gi Min, Dong Sul Kim, Byoung-Hoon Choi
  • Patent number: 11148415
    Abstract: A print head control circuit includes a first propagation wiring for propagating a clock signal input to a first terminal, a second propagation wiring for propagating a signal which is input to a second terminal and indicates a diagnosis result of a temperature abnormality detection circuit, and a fourth propagation wiring for propagating a second voltage signal input to a fourth terminal. When the second propagation wiring and the fourth propagation wiring are electrically coupled to a print head, the second propagation wiring and the fourth propagation wiring are electrically coupled to each other via the second terminal and the fourth terminal. The first propagation wiring and the second propagation wiring are located to be aligned. The first propagation wiring and the fourth propagation wiring are located to be adjacent to each other in a direction in which the first propagation wiring and the second propagation wiring are aligned.
    Type: Grant
    Filed: September 17, 2019
    Date of Patent: October 19, 2021
    Assignee: Seiko Epson Corporation
    Inventor: Yusuke Matsumoto
  • Patent number: 11117370
    Abstract: A liquid discharging apparatus includes a nozzle hole configured to discharge liquid; a liquid chamber provided so as to communicate with the nozzle hole; a piezoelectric element configured to change a pressure applied to the liquid in the liquid chamber to discharge the liquid from the nozzle hole; a driving waveform generation circuit configured to generate a driving waveform signal during a discharge control period having a predetermined cycle, to apply a driving waveform voltage to the piezoelectric element; a switch configured to selectively supply, to the piezoelectric element, a waveform included in the driving waveform signal; and a controller configured to perform voltage setting control for applying a predetermined voltage to the piezoelectric element, in a case where a non-discharge control period, having a predetermined cycle, causes the piezoelectric element to change by a voltage greater than or equal to an allowable voltage.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: September 14, 2021
    Assignee: Ricoh Company, Ltd.
    Inventor: Norimasa Sohgawa
  • Patent number: 11097536
    Abstract: A driving method enables a liquid feeding apparatus using a driving element in a membrane shape to feed a liquid at high liquid feeding accuracy. To this end, a voltage applied to the driving element is controlled in such a way as to repeat a first period in which a first voltage is applied and a second period which is a longer period than the first period and used to effect a change between the first voltage and a second voltage lower than the first voltage, and in such a way as to switch between application and non-application of the first voltage during the first period.
    Type: Grant
    Filed: December 26, 2019
    Date of Patent: August 24, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Rei Kurashima, Akihisa Iio, Takahiro Akiyama, Toru Nakakubo, Noriyuki Kaifu
  • Patent number: 11072169
    Abstract: Maintenance routines that can be used to maintain the operability of one or more DOD print heads in a card processing system. The maintenance routines can include, but are not limited to: a cover routine where a cover or cap is selectively and automatically located over the print head(s) to protect the print head(s); a shake pulse routine that energizes the nozzles of the print head(s) without causing an ejection of ink; a spit routine where the nozzles of the print head(s) are energized to eject one or more drops of ink; and a purge routine where the nozzles are not electrically energized but the pressure holding the ink in the nozzles of the print head(s) is reversed to push ink out of the nozzles.
    Type: Grant
    Filed: May 10, 2019
    Date of Patent: July 27, 2021
    Assignee: ENTRUST CORPORATION
    Inventors: Kevin Bontrager, Daniel Sarkinen, Cory D. Wooldridge, Jon Wawra, Brendan Hinnenkamp, Andrew Luu, Brian O'Dell, Kyle Johnson, Randy Jordan
  • Patent number: 11065869
    Abstract: A control device includes circuitry to generate a drive waveform applied to an electromechanical transducer element that changes pressure in a liquid chamber communicating with a nozzle to discharge liquid. The drive waveform includes, in a pulse unit of one discharge cycle, a first discharge pulse waveform including a damping element to damp a vibration of the liquid, and a second discharge pulse waveform subsequent to the first discharge pulse waveform. The circuitry selects at least one of the first and second discharge pulse waveforms in the pulse unit, in accordance with a volume of the liquid to be discharged, to cause the nozzle to discharge different volumes of the liquid. A pulse interval between the first and second discharge pulse waveforms is from Phlm×(N±?) to Phlm×(N±¼), where Phlm represents a Helmholtz period of the liquid chamber and N represents an integer of 1 or greater.
    Type: Grant
    Filed: October 21, 2019
    Date of Patent: July 20, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventor: Ryouhei Matsunaga
  • Patent number: 11056985
    Abstract: A microelectromechanical system includes a piezoelectric drive and a control unit coupled to the piezoelectric drive and designed to control the piezoelectric drive based on a change of the admittance and/or the impedance of the piezoelectric drive.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: July 6, 2021
    Assignee: Robert Bosch GmbH
    Inventor: Michael Curcic
  • Patent number: 10994533
    Abstract: A liquid discharge device includes a liquid discharge head including a plurality of liquid chambers respectively communicating with a plurality of nozzles and circulating liquid therethrough. Each liquid chamber is provided with a pressure generator for discharging the liquid from a corresponding nozzle. The liquid discharge device further includes a waveform data memory to store drive waveform data including discharge drive waveform data for discharging the liquid according to image data and micro-vibration drive waveform data for causing a micro vibration of a meniscus of the liquid discharge head. The liquid discharge device further includes circuitry configured to generate a drive waveform based on the drive waveform data; apply, to the pressure generator, a discharge drive waveform based on the discharge drive waveform data, in a printing area; and apply, to the pressure generator, a micro-vibration drive waveform based on the micro-vibration drive waveform data, in a non-print area.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: May 4, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventor: Takahiro Yoshida
  • Patent number: 10994534
    Abstract: A printing system and method for forming an ink droplet through the use of a multi-pulse driving signal to increase the printing frequency without reducing the droplet size by applying a multi-pulse driving signal to a small nozzle and to increase the inkjet printing speed by using a smaller nozzle to produce the same-size droplet using a multi-pulse driving signal, which allow for higher printing frequency due to the smaller nozzle size as dictated by the fundamental droplet formation dynamics.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: May 4, 2021
    Assignee: Board Of Trustees Of The University Of Arkansas
    Inventors: Wenchao Zhou, Chao Sui
  • Patent number: 10960665
    Abstract: An element substrate provided in a printhead includes a heater configured to heat ink and discharge the ink from a nozzle, a temperature sensor provided in correspondence with the heater, an electric current source configured to energize the temperature sensor with an electric current based on an electric current value specified by an externally input first signal, and a determination circuit configured to determine an ink discharge status of the nozzle based on a voltage output from the temperature sensor energized with the electric current and a threshold voltage specified by an externally input second signal, and output a determination result signal.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: March 30, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyasu Nomura, Nobuyuki Hirayama
  • Patent number: 10946647
    Abstract: A liquid discharge apparatus that includes a liquid discharge head including a nozzle discharging liquid onto a recording medium and a pressure generating unit generating pressure by a change in a drive waveform of the liquid, a drive waveform generating unit generating the drive waveform applied to the pressure generating unit, and a waveform selection unit selectively masking a part of the drive waveform and selecting a pulse of the drive waveform, wherein the drive waveform includes at least one discharge pulse and a micro-drive pulse for causing a change in meniscus so that the liquid is not discharged at a point where the liquid is not discharged on the recording medium, wherein the micro-drive pulse is disposed at a head of a discharge cycle of the drive waveform, and wherein the micro-drive pulse is disposed at an integer multiple of a natural vibration cycle Tc of the liquid chamber.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: March 16, 2021
    Assignee: Ricoh Company, Ltd.
    Inventor: Norimasa Sohgawa
  • Patent number: 10906307
    Abstract: A liquid discharge head according to the present disclosure includes a plurality of discharge holes, a plurality of pressure applying chambers, a flow path member including a plurality of common flow paths, and a plurality of pressure applying modules. Adjacent discharge hole groups have a part in which, when a discharge hole A is positioned in an n column in one of the discharge hole groups, a discharge hole B in the discharge hole group located adjacent with the common flow path interposed therebetween is positioned in an n±1 column. A discharge hole C in the discharge hole group located at a center in a second direction is positioned in an n column, while a non-carry discharge hole is positioned in an n±1 column.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: February 2, 2021
    Assignee: KYOCERA CORPORATION
    Inventors: Wataru Ikeuchi, Yifei Jiao
  • Patent number: 10897284
    Abstract: A system and method for programmably operating a DC load connected to a DC outlet. A power line communication (PLC) client at the outlet measures actual and desired DC voltage at the load. A remotely located DC power server is connected between a DC power source and the outlet. The power server has a PLC master in bidirectional feedback communication with the PLC client to determine the actual and desired DC voltage at the load. An adjustable DC voltage module at the power server is controlled by the PLC master to supply an adjustable DC voltage. The power server adjusts the DC voltage supplied by the voltage module to the load based on the bidirectional feedback communication between the PLC master and the PLC client.
    Type: Grant
    Filed: January 13, 2020
    Date of Patent: January 19, 2021
    Assignee: NEXTEK POWER SYSTEMS, INC.
    Inventors: Jeffrey Hunsinger, Paul Savage, Paul Wickett
  • Patent number: 10894400
    Abstract: A liquid ejecting apparatus is provided with pressure generating units for pressure chambers one of which is provided for each of a plurality of nozzles and drives the pressure generating units corresponding to liquid ejection requests which request liquid ejection from the nozzles while achieving supplying of a liquid to the pressure chambers and collection of the liquid which has passed through the pressure chambers. Accordingly, the liquid is ejected from the nozzles. Meanwhile, an occurrence of a fault in the liquid ejection is determined using a vibration transition of a residual vibration which occurs in the liquid of the pressure chambers according to a pressure change accompanying driving of the pressure generating units, and driving of the pressure generating unit of an ejection fault pressure chamber in which it is determined that a fault occurs in the liquid ejection is stopped spanning at least a fixed stopping period.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: January 19, 2021
    Assignee: Seiko Epson Corporation
    Inventors: Toshiro Murayama, Shunya Fukuda, Noriaki Okazawa
  • Patent number: 10894402
    Abstract: There is provided a driving circuit including: an integrated circuit, in which the integrated circuit includes an amplification control signal generation circuit that generates an amplification control signal, a first register that holds an operating state data indicating an operating state of the driving circuit, a second register that holds an abnormality detection data for determining the presence or absence of an abnormality in the operating state data, an abnormality detection circuit that determines whether or not the operating state data is abnormal based on the abnormality detection data, and generates an abnormality detection signal indicating the determination result; and an abnormality detection signal output control circuit that controls whether or not the abnormality detection signal is output, in which the abnormality detection signal output control circuit does not output the abnormality detection signal in a first mode to be shifted after power is turned on.
    Type: Grant
    Filed: November 21, 2019
    Date of Patent: January 19, 2021
    Assignee: Seiko Epson Corporation
    Inventor: Tetsuo Takagi
  • Patent number: 10894405
    Abstract: There is provided a driving circuit that drives a piezoelectric element, the driving circuit including an integrated circuit, in which the integrated circuit includes a first register that holds an operating state data, a second register that holds an abnormality detection data, an abnormality detection circuit that determines the presence or absence of an abnormality of the operating state data based on the abnormality detection data, and an output control circuit that controls supply of a first voltage signal to the piezoelectric element and supply of a power source voltage to the switch circuit, and in which the output control circuit delays stop of the supply of the power source voltage to the switch circuit with respect to stop of the supply of the first voltage signal to the piezoelectric element when the abnormality detection circuit determines that the operating state data is abnormal.
    Type: Grant
    Filed: November 21, 2019
    Date of Patent: January 19, 2021
    Inventor: Tetsuo Takagi
  • Patent number: 10875303
    Abstract: A liquid ejecting head including a head unit including a mounting surface on which a plurality of first terminals, to which a signal to eject ink from a nozzle is supplied, are formed, and a flexible wiring substrate including a plurality of second terminals that supply the signal to the head unit, the flexible wiring substrate bonded to the head unit with nonconductive paste while the second terminals and the first terminals are in an electrically coupled state, in which the plurality of second terminals are arranged at pitches of 50 ?m or less, and in which protrusions in contact with surfaces of the first terminals are formed on surfaces of the second terminals, the protrusions protruding at a height exceeding a surface roughness of the second terminals.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: December 29, 2020
    Inventors: Shunsuke Watanabe, Shingo Tomimatsu
  • Patent number: 10870272
    Abstract: A liquid discharging apparatus has: a first driving signal creation circuit that has a first transistor and a first integrated circuit; a second driving signal creation circuit that has a second transistor and a second integrated circuit; a third driving signal creation circuit that has a third transistor and a third integrated circuit; and a circuit board having a first side, a second side opposite to the first side, a third side, and a fourth side opposite to the third side. The first integrated circuit and first transistor are positioned on the circuit board side by side in a direction away from the first side and toward the second side. The third integrated circuit and third transistor are positioned on the circuit board side by side in a direction away from the third side and toward the fourth side.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: December 22, 2020
    Inventor: Dai Nozawa
  • Patent number: 10864720
    Abstract: There is a provided a drive circuit in which a first drive signal output circuit includes a first control circuit that controls an output of a first drive signal, and a first abnormality detection circuit that detects an abnormality in a first drive signal output circuit, a second drive signal output circuit includes a second control circuit that controls an output of a second drive signal, and a second abnormality detection circuit that detects an abnormality in a second drive signal output circuit, the first drive signal output circuit transmits an occurrence of abnormality to the second drive signal output circuit, when the first abnormality detection circuit detects the abnormality, and the second drive signal output circuit transmits an occurrence of abnormality to the first drive signal output circuit, when the second abnormality detection circuit detects the abnormality.
    Type: Grant
    Filed: January 24, 2020
    Date of Patent: December 15, 2020
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Hidehiko Yajima, Tetsuo Takagi
  • Patent number: 10864721
    Abstract: An example printer includes an actuator selection engine. The actuator selection engine is to determine, for an array including a plurality of fluidic actuators, which fluidic actuators to fire. The printer also includes a balancing engine. The balancing engine is to analyze the determined fluidic actuators to identify a large set of fluidic actuators scheduled to fire substantially simultaneously. The balancing engine is also to schedule the large set of fluidic actuators among a plurality of fire pulse groups. Each fire pulse group may include a subset of the large set of fluidic actuators to be fired at a time distinct from another subset.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: December 15, 2020
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Eric Martin, Andrew Koll
  • Patent number: 10864729
    Abstract: In a droplet discharge head, in an initial state in which a tip of the actuator has contact with the vibrating plate, and the actuator pushes the vibrating plate toward the first direction, based on a drive signal from the control section, the tip of the actuator displaces the vibrating plate toward the second direction in a state of having contact with the vibrating plate to thereby pull in a meniscus in the nozzle toward the liquid chamber, then, the tip of the actuator is separated from the vibrating plate to further displace the vibrating plate toward the second direction, and then, the tip of the actuator collides with the vibrating plate to thereby displace the vibrating plate toward the first direction to discharge the liquid from the nozzle.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: December 15, 2020
    Inventor: Keigo Sugai
  • Patent number: 10843458
    Abstract: Techniques are presented for digital ink jet printing upon a substrate with a significant third dimension. Droplets in the range of 120 pL to 200 pL have been found suitable for substrates with variability, in the third dimension, of up to approximately 4 cm. A larger droplet can be generated by utilizing a plurality of drive pulses, each of which generates a smaller droplet, and having the plurality of smaller droplets combine in mid-air. The data to be printed can be derived from a 3D model and such 3D model can also be used to guide shaping of the substrate. The 3D model can be produced from 2D image data. If the 2D image data is a two-dimensional portrait photograph, a result, of using the present invention, can be a realistic portrait in the form of a bas-relief sculpture.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: November 24, 2020
    Assignee: 3DPhotoWorks LLC
    Inventors: John Stewart Olson, Angelo Raymond Quattrociocchi
  • Patent number: 10821728
    Abstract: A printing system includes a controller and a thermal printing head including multiple driving elements and an integrated transmission control interface. The thermal printing head is coupled to the controller. The driving elements are configured to print. The integrated transmission control interface coupled to the controller and driving elements is configured to receive from the controller at least one of a compensation data, a printing data, a clock signal, a data signal, a latch signal or a start-heating signal, and send to driving elements the at least one of the compensation data, the printing data, the clock signal, the data signal, the latch signal or the start-heating signal.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: November 3, 2020
    Assignee: Chien Hwa Coating Technology, Inc.
    Inventors: Wen-Hsiung Lee, Chun-Fei Lin, Shao-Ying Lu, Wei-Sheng Huang, Hsin-Kai Wang
  • Patent number: 10814631
    Abstract: Ink stabilizing material is applied to rotatable panels within a cap of an inkjet cartridge resting structure. The rotatable panels then rotate to contact an inkjet printhead when the printhead contacts the cap. Continuous periodic flushing of the printhead is performed while the rotatable panels are contacting the printhead by periodically and repeatedly alternating between ejecting a mixture of the ink stabilizing material and ink from the nozzles, and drawing the mixture of the ink stabilizing material and the ink back into the nozzles.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: October 27, 2020
    Assignee: Xerox Corporation
    Inventors: Linn C. Hoover, Jason M. LeFevre, Douglas K. Herrmann, Chu-heng Liu, Paul J. McConville, David A. VanKouwenberg, Seemit Praharaj, Michael J. Levy
  • Patent number: 10814619
    Abstract: An image processing device configured to: determine whether a specific condition indicating ink supplied from an ink supplier to a printing head may be delayed; generate dot data by using image data, including: generating first dot data when the specific condition is not satisfied; and generating second dot data when the specific condition is satisfied, a ratio of first/second type of dots included in an image based on specific second dot data generated using specific image data being greater/smaller than that included in an image based on specific first dot data generated using the specific image data, and total number of dots included in the image based on the specific second dot data being larger that included in the image based on the specific first dot data; and output printing data based on the dot data.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: October 27, 2020
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Shota Morikawa, Masashi Kuno, Satoru Arakane, Yoshiharu Furuhata, Shin Hasegawa
  • Patent number: 10807359
    Abstract: There is provided a droplet deposition apparatus comprising: control circuitry configured to generate a common drive waveform; storage to store data, wherein the storage comprises a buffer to store scheduled image data relating to one or more pixels; a droplet deposition head having one or more actuator elements configured to be driven in response to drive pulses derived from the common drive waveform; and wherein the common drive waveform comprises a plurality of pixel periods comprising a firing phase and a non-firing phase, each firing phase comprising a firing pulse and each non-firing phase comprising a non-firing pulse, wherein the characteristics of each non-firing pulse are defined in response to the data in storage, and wherein, the firing pulse of a first pixel period is applied as a drive pulse to an actuator element based on the scheduled image data relating to a first pixel, and wherein the non-firing pulse of the first pixel period is applied as a drive pulse to the actuator element based on pas
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: October 20, 2020
    Assignee: XAAR TECHNOLOGY LIMITED
    Inventors: Ian Anthony Hurst, Neil Christopher Bird, Stephen Mark Jeapes
  • Patent number: 10800169
    Abstract: Provided is a print head including: multiple discharging sections, each of which discharges liquid based on a drive signal; and a data management section that includes a first data retention section and manages first control data that controls a state of each of the multiple discharging sections, and inspection target discharging-section designation data that designates the discharging section which is to be inspected, which is among the multiple discharging sections; and a drive waveform selection section that selects a waveform of the drive signal for each of the multiple discharging sections, in which the data management section has a first transfer mode in which the first control data is parallelly transferred to the first data retention section, and a second transfer mode in which the first data retention section is caused to operate as a shift register that serially transfers the inspection target discharging-section designation data.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: October 13, 2020
    Assignee: Seiko Epson Corporation
    Inventor: Motonori Chikamoto
  • Patent number: 10792915
    Abstract: A liquid discharge apparatus includes a liquid discharge head and processing circuitry. The liquid discharge head is configured to discharge, to a foamable medium, liquid having a function of suppressing foaming of the medium to form irregularities. The processing circuitry is configured to hold condition information indicating a content defined by each of a plurality of conditions related to image formation at a time when the liquid forms a predetermined pattern image on the medium; and generate and output, for each condition of the plurality of conditions, an evaluation medium on which irregularities corresponding to the predetermined pattern image formed according to the condition are formed.
    Type: Grant
    Filed: March 13, 2019
    Date of Patent: October 6, 2020
    Assignee: Ricoh Company, Ltd.
    Inventor: Yasunobu Takagi
  • Patent number: 10780693
    Abstract: According to one embodiment, an inkjet head includes a pressure chamber connected to a nozzle, an actuator corresponding to the pressure chamber and configured to change a volume of the pressure chamber, and a drive circuit configured to drive the actuator causing two or more ink droplets to be consecutively discharged from the nozzle. The drive circuit applies in sequence a first drive waveform for expanding the pressure chamber, a second drive waveform having a first pulse width, a third drive waveform for releasing the pressure chamber from an expanded state, a fourth drive waveform having a second pulse width, and a fifth drive waveform for contracting the pressure chamber.
    Type: Grant
    Filed: February 12, 2019
    Date of Patent: September 22, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Noboru Nitta
  • Patent number: 10773515
    Abstract: An image recording apparatus includes a carriage which reciprocatingly moves in a scanning direction, a head mounted on the carriage to jet liquid, a speed sensor which acquires speed data related to speed of the carriage, and a controller configured to: record an image by executing a recording pass in which the liquid is jetted from the head toward a recording medium while moving the carriage once toward one side in the scanning direction; determine whether the speed indicated by the speed data is lower than a threshold value during the recording pass; and based on determination that the speed indicated by the speed data is lower than the threshold value at a first point of time in the recording pass, determine whether to suspend or continue the recording pass by referring to the speed data acquired after a predetermined time since the first point of time.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: September 15, 2020
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Satoru Arakane, Kenji Kawamoto, Tsuyoshi Ito
  • Patent number: 10759166
    Abstract: A liquid ejection head includes a manifold configured to store liquid therein, a plurality of ejection channels, and a dummy channel. Each ejection channel communicates with the manifold and is configured to receive liquid from the manifold and eject liquid through a corresponding nozzle thereof open to a nozzle surface. The dummy channel communicates with the manifold and includes a dummy nozzle open to the nozzle surface. The dummy channel further includes a pressure chamber, an actuator configured to apply pressure to liquid in the pressure chamber, a communication passage connecting the manifold to the pressure chamber, and a circulation passage through which the pressure chamber communicates with the manifold. The circulation passage is different from the communication passage and located between the dummy nozzle and the manifold.
    Type: Grant
    Filed: March 7, 2019
    Date of Patent: September 1, 2020
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Toshihiro Kishigami, Shotaro Kanzaki, Mikio Hirano
  • Patent number: 10751994
    Abstract: A first flow path member of a liquid ejection head includes a plurality of pressurizing chambers respectively connected to a plurality of ejection holes, a plurality of first individual flow paths and a plurality of second individual flow paths which are respectively connected to the plurality of pressurizing chambers, and a first common flow path connected in common to the plurality of first individual flow paths and the plurality of second individual flow paths. The pressurizing chamber, the first individual flow path, the first common flow path, and the second individual flow path configure an annular flow path. When T0 denotes a resonance period of the pressurizing chamber and T1 denotes a time required for a pressure wave to circulate once around the annular flow path, a decimal place value of T1/T0 is ? to ?.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: August 25, 2020
    Assignee: Kyocera Corporation
    Inventors: Takashi Miyahara, Wataru Ikeuchi, Hiroyuki Kawamura, Kenichi Yoshimura, Naoki Kobayashi
  • Patent number: 10744764
    Abstract: A circuit or a droplet deposition apparatus, the circuit configured to generate a drive waveform having a drive pulse, a first non-ejection pulse and a second non-ejection pulse, and wherein the first non-ejection pulse is inverted with respect to the second non-ejection pulse.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: August 18, 2020
    Assignee: XAAR TECHNOLOGY LIMITED
    Inventor: Mario Massucci
  • Patent number: 10730289
    Abstract: A liquid ejecting apparatus includes an ejection unit that ejects a liquid by a piezoelectric element being driven, a drive signal generation unit that generates a drive signal for driving the piezoelectric element, a residual vibration detection unit that detects a residual vibration of the ejection unit after the drive signal is applied to the piezoelectric element, and an inspection control signal generation unit that generates an inspection control signal for instructing start of detection of the residual vibration by the residual vibration detection unit. The inspection control signal when a temperature of the ejection unit is a first temperature differs from the inspection control signal when the temperature of the ejection unit is a second temperature lower than the first temperature.
    Type: Grant
    Filed: December 26, 2018
    Date of Patent: August 4, 2020
    Assignee: Seiko Epson Corporation
    Inventor: Toshiyuki Suzuki
  • Patent number: 10730286
    Abstract: There is provided an image recording apparatus including a carriage, a head, a velocity sensor, and a controller. The controller obtains velocity data of the carriage from the velocity sensor, determines a threshold value based on the velocity data, records an image on a recording medium, and suspends a recording pass when the controller has determined that a velocity indicated by the velocity data is lower than a velocity corresponding to the threshold value. The controller can execute a first recording mode and a second recording mode in which the velocity of the carriage is faster than that of the first recording mode. The velocity data for the first recording mode is obtained in a warm-up time after a recording command is received until recording of the image is started. The velocity data for the second recording mode is obtained in other time other than the warm-up time.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: August 4, 2020
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Satoru Arakane, Kenji Kawamoto, Tsuyoshi Ito
  • Patent number: 10723129
    Abstract: Disclosed is a liquid ejecting head including a flow passage forming section in which a pressure chamber which communicates with a nozzle ejecting liquid and a circulation liquid chamber which communicates with the pressure chamber to circulate the liquid are formed, a driving element that generates pressure change in the pressure chamber, a circuit board for driving the driving element, and a connecting terminal that electrically connects the driving element with the circuit board, in which the connecting terminal overlaps the circulation liquid chamber in a plan view.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: July 28, 2020
    Assignee: Seiko Epson Corporation
    Inventors: Katsutomo Tsukahara, Motoki Takabe, Yuma Fukuzawa
  • Patent number: 10717298
    Abstract: A method of operating an inkjet printer that forms textual data with non-absorbing media ink on non-absorbing media forms the characters with structure that improves the integrity of the edges of the characters over previously known systems. The method includes modifying character pixels in image data used to generate firing signals for operating inkjets in a print head of an inkjet imaging device, generating firing signals for operating the inkjets from the modified character pixels, and operating the inkjets in the print head with the generated firing signals to eject drops of non-absorbing media ink onto non-absorbing media to form characters on the non-absorbing media. The character pixel modification reduces a number of character pixels in a connecting zone of a character that have a value that corresponds to a firing signal that activates an inkjet.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: July 21, 2020
    Assignee: Xerox Corporation
    Inventors: David A. Mantell, Chu-Heng Liu, Seemit Praharaj, Stuart A. Schweid
  • Patent number: 10710362
    Abstract: Disclosed is a method of providing adjustment data for a droplet deposition head (such as a printhead), or a data processing component therefor. The method makes use of test data, which has been collected by operating the droplet deposition head (or a test droplet deposition head of substantially the same construction, e.g from the same batch), using a set of test waveforms, at a number of frequencies within a test range, and by recording the volume and velocity of the thus-ejected droplets, with these recorded values (volr, velr) being represented within the test data. Each of the set of test waveforms includes a basic drive waveform and a number of adjusted drive waveforms, each of which corresponds to the basic drive waveform, but with a particular waveform parameter adjusted by a corresponding amount. This waveform parameter is a continuous variable, such as pulse width or pulse amplitude.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: July 14, 2020
    Assignee: XAAR TECHNOLOGY LIMITED
    Inventors: Tony Cruz-Uribe, Subramanian Sivaramakrishan, Raymond Paul Marko Dorrestijn
  • Patent number: 10710364
    Abstract: In accordance with an embodiment, a liquid discharge head comprises an actuator and a controller. The actuator drives a pressure chamber, which is filled with liquid and communicates with a nozzle in which a meniscus of the liquid is formed. The controller applies an acceleration pulse for accelerating vibration of the meniscus to the actuator after applying a discharge pulse for discharging the liquid in the pressure chamber from the nozzle.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: July 14, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Jun Takamura
  • Patent number: 10710371
    Abstract: Exemplary printing apparatuses include, among other components, a printhead structure that includes nozzles adapted to eject liquid ink, a carriage assembly having positioning structures, and one or more printhead caps or cups within the carriage assembly. The carriage assembly is shaped to latch to the printhead structure. The printhead includes corresponding structures and the positioning structures engage with the corresponding structures when the carriage assembly is latched to the printhead structure. Also, the printhead caps are positioned within the carriage assembly so as to cover the nozzles when the carriage assembly is connected to the printhead structure.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: July 14, 2020
    Assignee: Xerox Corporation
    Inventors: Richard A. Kalb, Douglas A. Gutberlet, Patrick J. Howe
  • Patent number: 10703098
    Abstract: A liquid ejecting apparatus includes a nozzle for ejecting liquid, a pressure chamber communicating with the nozzle, a first individual flow path communicating with the pressure chamber, a second individual flow path communicating with the pressure chamber, a pressure generating unit changing a pressure of the liquid in the pressure chamber, and a control unit for driving the pressure generating unit. In the liquid ejecting apparatus, the liquid is supplied into the pressure chamber via one of the first individual flow path and the second individual flow path, and at least a part of the liquid supplied into the pressure chamber is discharged via the other. The control unit introduces air into the pressure chamber via the nozzle by driving the pressure generating unit, during a period in which the liquid is not ejected from the nozzle.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: July 7, 2020
    Assignee: Seiko Epson Corporation
    Inventor: Noriaki Okazawa
  • Patent number: 10680157
    Abstract: A driving system includes a voltage conversion module, a switching module, a detecting module, a voltage dividing module and a microcontroller. The voltage conversion module converts a first DC voltage into a second DC voltage. The switching module converts the second DC voltage into an AC voltage so as to drive a piezoelectric actuator of a piezoelectric pump. The detecting module includes a feedback circuit and a gas pressure sensor, wherein the feedback circuit detects an electric power reference value of the switching module, and the gas pressure sensor detects the gas pressure value of the piezoelectric pump. The microcontroller acquires a working frequency according to the electric power reference value so as to operate the piezoelectric actuator at the working frequency. The microcontroller controls the voltage conversion module to adjust the output voltage. Consequently, a gas pressure in the piezoelectric pump is correspondingly adjusted.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: June 9, 2020
    Assignee: MICROJET TECHNOLOGY CO., LTD.
    Inventors: Shih-Chang Chen, Jia-Yu Liao, Chi-Feng Huang, Wei-ming Lee, Yung-Lung Han
  • Patent number: 10668759
    Abstract: A head voltage correcting method for inkjet printing apparatus which perform printing with a head having a plurality of head modules includes the following steps: a testing chart printing step for printing testing charts which includes a lowest density head module check pattern, satellite check patterns, band-by-band density variable patterns, and in-band density variable patterns; a lowest density head module determining step for determining a lowest density head module; a satellite-free drive voltage determining step; and a new reference voltage determining step for determining a drive voltage of the band-by-band density variable patterns of the adjacent head module to be a new reference voltage for the adjacent head module.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: June 2, 2020
    Assignee: SCREEN HOLDINGS CO., LTD.
    Inventors: Asuka Muramatsu, Seiya Nomura
  • Patent number: 10668718
    Abstract: An inkjet recording apparatus has a head, a first board, and a second board. The head has a plurality of nozzles and a plurality of driving elements. The first board includes a control circuit and a sensing circuit unit. The second board includes a driving voltage generator and a driver circuit. The driver circuit makes ink ejected. The driving voltage generator and the driver circuit are connected together via a first power supply line. The sensing circuit unit is connected to the first power supply line and outputs a first sensing signal. Based on the first sensing signal, the control circuit senses an abnormality in power supply on the second board.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: June 2, 2020
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Koji Kusumoto
  • Patent number: 10661557
    Abstract: A liquid discharge apparatus includes: a signal line supplied with a print data signal including first data and second data; a discharge head including a plurality of nozzles including a first nozzle and a second nozzle that discharge liquid in accordance with the print data signal; a first register that is connected to the signal line, captures the first data corresponding to the first nozzle, and holds the first data; a second register that is connected to the signal line, captures the second data corresponding to the second nozzle, and holds the second data; and a register selection circuit that exclusively selects either capturing the first data by the first register or capturing the second data by the second register based on register selection data.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: May 26, 2020
    Assignee: Seiko Epson Corporation
    Inventor: Toru Kashimura
  • Patent number: 10611147
    Abstract: A liquid discharge device includes a liquid discharge head to discharge liquid and circuitry configured to generate a drive waveform to drive the liquid discharge head. The circuitry converts, to an analog signal, drive waveform voltage data being a source of the drive waveform; amplifies in voltage the analog signal to generate a drive waveform voltage signal; amplifies in current the drive waveform voltage signal to generate the drive waveform; monitors the drive waveform to detect an abnormality of the drive waveform; controls an operation of the liquid discharge device based on a result of detection of the abnormality of the drive waveform; compares an output of the voltage amplifier and an output of the current amplifier to output a difference between the output of the voltage amplifier and the output of the current amplifier; and outputs a binarized signal based on the difference.
    Type: Grant
    Filed: January 31, 2019
    Date of Patent: April 7, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventor: Kohtaroh Ikegami
  • Patent number: 10603923
    Abstract: A method for detecting defective printing nozzles in an inkjet printing machine includes printing a multi-row printing nozzle test chart formed of horizontal rows of equidistant vertical lines periodically underneath one another, with only printing nozzles in a print head contributing to every row of the test chart corresponding to the horizontal rows. An area coverage element geometrically associated with the test chart is printed, both elements are recorded by an image sensor and analyzed by the computer. The computer analyzes the recorded area coverage element to detect print defects and allocates defects to a region of geometrically close printing nozzles. An analysis of the test chart in the region identifies nozzles causing the defect. Defective printing nozzles are detected based on thresholds, the detected printing nozzles are then compensated, and in the analysis of the recorded area coverage element, influences of the sensor are eliminated by shading correction.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: March 31, 2020
    Assignee: Heidelberger Druckmaschinen AG
    Inventors: Johannes Muehl, Hans Koehler, Roland Stenzel, Andreas Henn, Martin Mayer, Steffen Neeb, Frank Muth, Jan Krieger, Nicklas Raymond Norrick, Mina Abosetta