Drive Waveform Patents (Class 347/10)
  • Patent number: 10538084
    Abstract: A liquid ejection head includes an element substrate for ejecting a liquid, an integrated circuit board outputting a control signal for controlling the element substrate, and an electrical wiring board connected electrically to the element substrate. The electrical wiring board has a signal line connector to which control signals are inputted and electrical wiring board connectors to which an electric signal for driving the liquid ejection head is inputted. The signal line connector and the electrical wiring board connectors are disposed on opposite sides to each other relative to a center line extending orthogonally to a longitudinal direction of the electrical wiring board.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: January 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takuma Kodoi, Takuya Iwano, Takamitsu Tokuda
  • Patent number: 10538082
    Abstract: A semiconductor device used for a liquid discharge head includes first heaters configured to apply energy to a liquid, second heaters whose resistance values are to be measured, switch elements, and first and second lines. Each of the second heaters is connected in series with a corresponding one of the switch elements between the first line and the second line. The second heaters have shapes different in at least one of length or width. A connection destination of at least one of two terminals of each of the first heaters is different from connection destinations of two terminals of each of the second heaters.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: January 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kazunari Fujii
  • Patent number: 10532568
    Abstract: First electronics may determine a count of bubble jet resistors to be fired by a fire pulse group. A fire pulse generator may generate a fire pulse train for bubble jet resistors, the fire pulse train comprising a precursor pulse and a firing pulse separated by a dead time. Second electronics may adjust a width of the fire pulse for the bubble jet resistors of the fire pulse group by maintaining a first edge of the fire pulse relative to the precursor pulse and adjusting a second edge of the fire pulse relative to the precursor pulse based upon the determined count for the fire pulse group.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: January 14, 2020
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Vincent C. Korthuis, Eric T Martin, Michael W. Cumbie, Scott A Linn, Pere Esterri
  • Patent number: 10525706
    Abstract: An inkjet recording apparatus and an inkjet recording method which enable changing a droplet amount without changing a droplet speed of an ink discharged from the same nozzle, and including an inkjet head which expands and contracts a capacity of a pressure chamber by applying a driving signal to an actuator and a driving circuit which applies the driving signal to the actuator, the driving signal including a first expansion pulse which starts from a reference potential and expands the capacity of the pressure chamber, a first contraction pulse which contracts the capacity of the pressure chamber to discharge the ink from the nozzle, a second expansion pulse which expands the capacity of the pressure chamber, and a second contraction pulse which contracts the capacity of the pressure chamber and returns to the reference potential in the mentioned order, the driving circuit being configured to enable discharging different droplet amounts of the ink from the same nozzle by changing a potential difference betwee
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: January 7, 2020
    Assignee: KONICA MINOLTA, INC.
    Inventor: Masanori Shimazoe
  • Patent number: 10513113
    Abstract: A printhead circuit for providing pulses for driving two or more actuating elements, the circuit comprising a cold switch drive circuit, for driving an actuating element for a first phase of a first pulse, the cold switch drive circuit having a cold drive switch for selectively coupling a drive waveform to the actuating element during the first phase according to a print signal; and a hot switch drive circuit, for driving the actuating element for a second phase of the first pulse, wherein the hot switch drive circuit is configured to drive the actuating element during the second phase according to an actuating element compensation indication signal.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: December 24, 2019
    Assignee: XAAR TECHNOLOGY LIMITED
    Inventors: Andrew L van Brocklin, Stephen Mark Jeapes, Ian Anthony Hurst
  • Patent number: 10500844
    Abstract: According to one embodiment, a waveform generating device includes a head driver configured to apply a driving signal to an actuator to discharge ink from a pressure chamber connected to a nozzle, the driving signal including a first portion for reducing an ink pressure in the pressure chamber and a second portion for increasing the ink pressure in the pressure chamber. The second portion is increased in potential by a first potential increase when ink pressure in the pressure chamber is at a maxima and the second portion is further increased in potential by a second potential increase when the ink pressure of the pressure chamber is at a negative value after the first potential increase.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: December 10, 2019
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Hiroyuki Watanabe, Jun Takamura, Noboru Nitta
  • Patent number: 10500850
    Abstract: A fluid ejection device includes a fluid slot, a fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the fluid ejection chamber, a fluid circulation channel communicated at one end with the fluid slot and communicated at another end with the fluid ejection chamber, a fluid circulating element within the fluid circulation channel, and a channel wall separating the fluid ejection chamber and the fluid circulation channel. The fluid circulation channel includes a channel loop, and a width of the channel wall is based on a width of the channel loop and a width of the fluid ejection chamber.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: December 10, 2019
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Alexander Govyadinov, Paul A Richards
  • Patent number: 10493751
    Abstract: A liquid discharging apparatus includes a head unit driven by a drive signal to discharge a liquid; a substrate; and a first transistor and a second transistor provided on the substrate and configured to generate the drive signal. In the substrate, a screw hole is provided between the first transistor and the second transistor.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: December 3, 2019
    Assignee: Seiko Epson Corporation
    Inventors: Tomonori Yamada, Koji Kurioka, Kazuhiro Nishiwake, Toru Matsuyama
  • Patent number: 10474846
    Abstract: A transaction device includes circuitry that provides a power supply to a processor of the transaction device. Attackers may attempt to glitch the processor power supply in a manner that causes processor to operate incorrectly such as by skipping instructions. A monitoring circuit may be coupled to the processor power supply circuitry to identify conditions that are indicative of a glitch attempt. Glitch attempts may be stored in a memory and reported to the processor to induce the execution of counter-measures.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: November 12, 2019
    Assignee: Square, Inc.
    Inventors: Afshin Rezayee, Malcolm Ronald Smith, Yue Yang
  • Patent number: 10449761
    Abstract: A driving signal generation circuit generates a main driving signal including, in each of driving periods, at least a first sub driving signal including a first driving pulse and a second driving pulse, and a second sub driving signal including a third driving pulse and provided before the first sub driving signal. A driving signal supply circuit includes a first dot generator supplying the first sub driving signal but not supplying the second sub driving signal to an actuator coupled with a vibration plate defining a portion of a pressure chamber, and a second dot generator supplying the first sub driving signal and the second sub driving signal to the actuator.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: October 22, 2019
    Assignee: ROLAND DG CORPORATION
    Inventors: Keisuke Misawa, Kenji Kazaoka
  • Patent number: 10449770
    Abstract: A liquid droplet ejecting apparatus includes a liquid droplet ejecting head that includes a plurality of nozzles from which a liquid supplied from a liquid supply source through a liquid supply path is ejected as a liquid droplet, and ejects the liquid droplet from the nozzle to a recording medium to perform a recording process, a first detecting section that detects a vibration waveform of the pressure chamber, which is vibrated when an actuator is driven to cause the pressure chamber communicating with the nozzle to vibrate, to detect a state inside the pressure chamber, and a second detecting section that reads a pattern formed on the recording medium by ejecting the liquid droplet from the nozzle to detect an ejection state of the liquid droplet.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: October 22, 2019
    Assignee: Seiko Epson Corporation
    Inventors: Takayuki Kawakami, Shinsuke Yokote, Toshihiro Shinbara, Tsuyoshi Hayashi, Takeshi Yoshida, Yuji Kanazawa
  • Patent number: 10399331
    Abstract: An ink jet head includes a pressure chamber, a nozzle plate including a nozzle, an actuator configured to cause an ink to be discharged from the pressure chamber via the nozzle, and a drive circuit configured to supply to the actuator an expansion signal, having a pulse width equal to a natural vibration cycle of the ink in the pressure chamber, that expands the pressure chamber to an expanded state from an initial state, a release signal, having a pulse width longer than the natural vibration cycle and shorter than three times the natural vibration cycle, that returns the pressure chamber to the initial state from the expanded state, and a contraction signal, having a pulse width longer than the natural vibration cycle and shorter than three times the natural vibration cycle, that contracts the pressure chamber to a contracted state from the initial state.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: September 3, 2019
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Hiroyuki Watanabe
  • Patent number: 10376915
    Abstract: An imprint apparatus, comprises: a discharge unit that discharges a liquid onto a substrate; a storage unit that stores a plurality of discharge conditions for the discharge unit; and a control unit that controls the discharge unit based on a discharge condition that is stored in the storage unit, wherein the control unit selects the discharge condition from the plurality of discharge conditions in accordance with a discharge spacing for discharging the liquid.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: August 13, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Ken Katsuta
  • Patent number: 10369801
    Abstract: A liquid propelling component includes a liquid channel, a circuit block. The circuit block includes a first conductor disposed in the liquid channel to be in contact with liquid in the channel and a second conductor insulated from liquid in the channel. The liquid propelling component further includes a memory storing a digital code that corresponds to an analog value of the second conductor under a predefined charge.
    Type: Grant
    Filed: November 25, 2014
    Date of Patent: August 6, 2019
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Vincent C Korthuis, David Maxfield, Andrew Queisser
  • Patent number: 10363739
    Abstract: A recording device includes: a head voltage control unit of setting target voltage of head voltage used to perform the recording operation by driving a recording head; a DC voltage generating unit generating drive voltage while giving a feedback so as to obtain a target voltage; and a smoothing capacitor connected between an output unit of the DC voltage generating unit and the recording head and having capacity which is twice or more as large as capacity of all of nozzles of the recording head driven at the same timing. The output voltage of the DC voltage generating unit is increased to the target voltage over predetermined time.
    Type: Grant
    Filed: May 21, 2018
    Date of Patent: July 30, 2019
    Assignee: Konica Minolta, Inc.
    Inventor: Takashi Mukaiyama
  • Patent number: 10361163
    Abstract: A circuit for preventing forgery of semiconductor chip includes a driving signal protection unit and a control unit. The driving signal protection unit configured to include at least one protection wire protecting a driving wire having driving signals flow therethrough. The control unit configured to generate a first security code and a second security code. The control unit is further configured to compare the first security code that passes through the driving signal protection unit and the second security code that bypasses the driving signal protection unit to detect tampering at the at least one protection wire, and to control operation of the semiconductor chip.
    Type: Grant
    Filed: April 25, 2016
    Date of Patent: July 23, 2019
    Assignee: MagnaChip Semiconductor, Ltd.
    Inventor: Yong Sup Lee
  • Patent number: 10360483
    Abstract: A method, includes receiving native image data at a processor for a printing system having a jet stack including a nozzle plate with an array of jets, formatting the native image data by pixels for each jet within the array of jets to produce ordered image data, scanning the ordered image data to determine timing and frequency of any pre-fire sequences needed for each jet, replacing a portion of the ordered image data for jets that need pre-fire sequences with a predetermined trigger sequence followed by a number and pattern of pre-fire pulses to produce modified image data, and transmit the modified image data.
    Type: Grant
    Filed: March 23, 2017
    Date of Patent: July 23, 2019
    Assignee: XEROX CORPORATION
    Inventor: David L. Knierim
  • Patent number: 10357967
    Abstract: Printheads for jetting a print fluid and associated methods. In one embodiment, the printhead includes a row of jetting channels configured to jet droplets of a print fluid, and a head driver that receives a data signal and a drive waveform comprising a series of jetting pulses. Responsive to the data signal indicating jetting by a jetting channel, the head driver applies one or more jetting pulses on the drive waveform to an actuator of the jetting channel to cause ejection of a droplet from a nozzle of the jetting channel. Responsive to the data signal indicating non-jetting by the jetting channel, the head driver clips the amplitude of a jetting pulse on the drive waveform to generate a non-jetting pulse that is applied to the actuator of the jetting channel. The non-jetting pulse creates movement of a fluid meniscus at the nozzle of the jetting channel without ejecting a droplet.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: July 23, 2019
    Assignee: Ricoh Company, Ltd.
    Inventor: Hiroshi Nishimura
  • Patent number: 10350883
    Abstract: liquid discharge apparatus includes a liquid discharge head including a plurality of electrodes arranged in parallel, a common electrode positioned to face the liquid discharge head, and a control unit configured to control a voltage to be applied to each of the plurality of electrodes to control the plurality of electrodes as a discharging electrode, which is to discharge a liquid, or as a non-discharging electrode, which is to discharge no liquid, wherein the control unit adjusts a value of the voltage to be applied to the electrode that is to be driven as the non-discharging electrode, based on the voltage to be applied to the electrode adjacent to the electrode that is to be driven as the non-discharging electrode.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: July 16, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryuji Yamamoto, Hideaki Okamoto, Junji Yasuda, Koji Inoue
  • Patent number: 10350886
    Abstract: An ink-jet recording apparatus includes: a recording head including first and second nozzles and first and second driving elements corresponding to the first and second nozzles respectively; a controller; and a head driving circuit connected to the controller by first and second signal lines and a third signal line for transmitting a clock signal, the head driving circuit connected electrically to the first and second driving elements. Each of the first and second driving elements is driven to jet an ink droplet from one of the first and second nozzles corresponding thereto when driving voltage is applied from the head driving circuit. The controller executes relative movement processing for the recording head and a sheet in parallel with recording processing in which pattern signals of the driving voltage are outputted serially to the first signal line and a jetting instruction signal is outputted serially to the second signal line.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: July 16, 2019
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Shoji Sato, Keisuke Yamamoto, Kenji Kawamoto, Satoru Arakane
  • Patent number: 10350882
    Abstract: A liquid injection device includes a liquid injection head and a controller including a driving signal generator generating a driving signal including, in one liquid drop injection period, a first driving pulse and a second driving pulse, and a driving signal supplier. The first driving pulse maintains the pressure chamber in an expanded state for a time period of about (½)×Tc; and the second driving pulse starts at a timing that is about n×Tc after the start of the first driving pulse, n being an integer satisfying n?2, to maintain the pressure chamber in the expanded state for the time period of about (½)×Tc, and to inject the second liquid drop at a speed higher than, or equal to, a speed at which the first liquid drop is injected.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: July 16, 2019
    Assignee: ROLAND DG CORPORATION
    Inventors: Keisuke Misawa, Takashi Makinose, Kenji Kawagoe
  • Patent number: 10336088
    Abstract: An object is to provide a liquid ejection apparatus that allows suppression of a fluctuation in a pressure of a liquid in a flow path caused by a liquid delivery unit, enabling the liquid to be stably ejected through an ejection port. The liquid ejection apparatus including a liquid ejection head having an ejection port through which a liquid is ejected, a flow path configured to communicate with the ejection port, and a liquid delivery unit configured to feed the liquid to the flow path. A relation between an angular frequency ? of the liquid delivered from the liquid delivery unit, a coefficient of kinematic viscosity ? of the liquid, and an equal diameter a of at least a part of a section of an extra-head flow path in a direction normal to a direction in which ink flows satisfies ?(?/2?)×a>1.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: July 2, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshiyuki Nakagawa
  • Patent number: 10328693
    Abstract: Fluid jetting device comprising: a nozzle plate, a fluid chamber terminating in an orifice in the nozzle plate, an actuator for generating a pressure wave in a fluid in the fluid chamber to jet fluid through the orifice from the chamber, a jetting waveform generating device connected to the actuator for generating an excitation waveform comprising two separated pulses, called a jetting pulse and a quenching pulse, for respectively generating a pressure wave in the fluid in the fluid chamber leading to a fluid droplet and for substantially cancelling a pressure wave in the fluid in the fluid chamber, wherein the jetting waveform generating device is adapted to make, when jetting two consecutive fluid droplets, a first and a second droplet, the jetting pulse of the second droplet at least partially overlap the quenching pulse directly following the jetting pulse of the first droplet.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: June 25, 2019
    Assignee: OCÉ HOLDING B.V.
    Inventors: Pierre A. M. Klerken, Johannes M. M. Simons, Ralph Van Der Heyden
  • Patent number: 10328703
    Abstract: An inkjet recording apparatus includes a piezoelectric element, an extraction processing portion, and a drive control portion. The piezoelectric element is provided in correspondence with a nozzle, and upon input of a first drive signal, causes ink to be ejected from the nozzle. The extraction processing portion, when a print process is executed, extracts a non-ejection period during which a non-ejection state continues for more than a reference time period, from an execution period of the print process based on a plurality of pieces of image data printed in the print process, wherein ink is not ejected from the nozzle in the non-ejection state. The drive control portion inputs a second drive signal for causing the piezoelectric element to stir the ink in the nozzle, to the piezoelectric element during a partial period of the non-ejection period extracted by the extraction processing portion.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: June 25, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Toshihiko Tanaka, Toshiaki Mutsuo
  • Patent number: 10323957
    Abstract: A discrete-time high voltage generating circuitry is described, configured to provide a discrete-time high voltage at a high voltage output only during defined high voltage periods. The discrete-time high voltage generating circuitry includes a current mirror circuitry configured to receive a supply current from a high voltage source and to provide a slew current. The discrete-time high voltage generating circuitry is configured to generate the discrete-time high voltage using the slew current. Further, a method to operate a discrete-time high voltage generating circuitry is described. The circuitry and method may be used to provide a discrete-time self-test bias voltage to at least one capacitive load such as a capacitive MEMS element.
    Type: Grant
    Filed: November 17, 2016
    Date of Patent: June 18, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Lasse Aaltonen
  • Patent number: 10315414
    Abstract: In some examples, a drive signal generator for a fluid ejection element of a piezoelectric printhead, includes a core amplifier to amplify an input waveform to provide an amplified waveform, and a plurality of rail power circuits, each coupled to a different power input of the core amplifier. Each rail power circuit of the plurality of rail power circuits includes a comparator to compare an instantaneous voltage of the amplified waveform to a subset of a plurality of voltage sources, and a switch to, based on the comparing by the comparator, couple to a respective power input of the core amplifier a voltage source in the subset of the plurality of voltage sources that is closest to the instantaneous voltage and sufficient to generate the amplified waveform.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: June 11, 2019
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventor: Andrew L. Van Brocklin
  • Patent number: 10315418
    Abstract: Systems and methods for controlling supply of electrical energy from power source(s) through a plurality of electrical conductors adjacent to a common electrolyte solution are disclosed. The power source(s) are controlled to apply potential difference waveform(s) between pairs of electrical conductors formed from the plurality of electrical conductors such that the potential difference waveform(s) have a magnitude that exceeds a threshold overpotential for the pairs of electrical conductors in the electrolyte solution while sums of an absolute value of a potential difference across a double layer associated with the first electrical conductor in a pair and an absolute value of a potential difference across a double layer associated with a second electrical conductor in the pair is maintained below the threshold overpotential. Some or all electrical conductor(s) can be coupled to the power source(s) using respective capacitor(s).
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: June 11, 2019
    Assignee: Archipelago Technology Group, LTD
    Inventors: Guy Charles Fernley Newcombe, Daniel Richard Mace, Nicholas James Hastings
  • Patent number: 10308020
    Abstract: A fluid ejection device includes a fluid slot, a first fluid ejection chamber communicated with the fluid slot and including a first drop ejecting element, a second fluid ejection chamber communicated with the fluid slot and including a second drop ejecting element, a fluid circulation path communicated with the first fluid ejection chamber and the second fluid ejection chamber, and a fluid circulating element within the fluid circulation path.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: June 4, 2019
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Alexander Govyadinov, Tsuyoshi Yamashita, Erik D. Torniainen, Nicholas McGuinness, David P. Markel
  • Patent number: 10286648
    Abstract: A substrate is held and rotated by a spin chuck. A processing liquid is discharged from a discharger to the substrate rotated by the spin chuck. The discharger has a plurality of discharge ports arranged in one direction and can selectively discharge the processing liquid from the plurality of respective discharge ports. With a row of the plurality of discharge ports of the discharger crossing and facing a peripheral portion of the substrate rotated by the spin chuck, the processing liquid is supplied to a position further outward than an inner edge of the peripheral portion. The processing liquid is not supplied to a position further inward than the inner edge of the peripheral portion of the substrate.
    Type: Grant
    Filed: August 1, 2017
    Date of Patent: May 14, 2019
    Assignee: SCREEN Holdings Co., Ltd.
    Inventor: Yukihiko Inagaki
  • Patent number: 10276796
    Abstract: Disclosed is an ejection volume compensation method of an inkjet printer for manufacturing an organic electroluminescent device pixel. The inkjet printer includes a plurality of nozzles and is configured to perform a plurality of print processes for the same pixel location. A target ejection volume for the next print process is selected so that an average of the target ejection volume and an actual ejection volume for the previous print process is equal to an ideal ejection volume. Also disclosed are an ejection volume compensation device for use with the inkjet printer, an inkjet printing device, and a non-transitory machine readable medium.
    Type: Grant
    Filed: June 16, 2017
    Date of Patent: April 30, 2019
    Assignee: BOE TECHNOLOGY GROUP CO., LTD.
    Inventor: Huifeng Wang
  • Patent number: 10259219
    Abstract: A liquid droplet ejection head includes: a main body member that includes a nozzle that ejects a liquid droplet, a first pressure chamber that is linked to the nozzle, and a second pressure chamber that is linked to the nozzle; a first piezoelectric element that pressurizes the first pressure chamber by applying a first voltage, and causes the liquid droplet to be ejected from the nozzle; and a second piezoelectric element that pressurizes the second pressure chamber by applying a second voltage which is equal to or higher than the first voltage, and deflects the direction of the liquid droplets ejected from the nozzle.
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: April 16, 2019
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Shinji Seto, Kotaro Maeda
  • Patent number: 10245828
    Abstract: A discharge waveform generating device includes a timing reference generation circuit, a timing adjustment circuit, a waveform pattern generation circuit, and a timing correction circuit. The timing reference generation circuit generates a discharge timing for generating, from image data, a discharge waveform of ink to print the image data, based on a line synchronization signal for synchronizing discharge operations of discharge nozzles to discharge ink. The timing adjustment circuit sets an adjustment value of the discharge timing. The waveform pattern generation circuit generates the waveform from the image data, based on outputs of the timing reference generation circuit and the timing adjustment circuit.
    Type: Grant
    Filed: July 28, 2017
    Date of Patent: April 2, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Koji Kawahata, Takashi Michiyoshi
  • Patent number: 10232632
    Abstract: An object is to provide a liquid ejection apparatus that allows suppression of a fluctuation in a pressure of a liquid in a flow path caused by a liquid delivery unit, enabling the liquid to be stably ejected through an ejection port. The liquid ejection apparatus including a liquid ejection head having an ejection port through which a liquid is ejected, a flow path configured to communicate with the ejection port, and a liquid delivery unit configured to feed the liquid to the flow path. A relation between an angular frequency ? of the liquid delivered from the liquid delivery unit, a coefficient of kinematic viscosity ? of the liquid, and an equal diameter a of at least a part of a section of an extra-head flow path in a direction normal to a direction in which ink flows satisfies ?(?/2?)×a>1.
    Type: Grant
    Filed: May 17, 2017
    Date of Patent: March 19, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yoshiyuki Nakagawa
  • Patent number: 10220614
    Abstract: An inkjet printhead including an inkjet configured to eject drops of ink in response to receiving an electrical signal, a memory configured to store image data, and a processor operatively coupled to the inkjet and the memory. The processor receives the image data and determines a period of latency of the inkjet printhead. When the period of latency is within a predetermined timeframe, the processor increases a voltage of the electrical signal to a second voltage for an initial number of drops to eject the drops of ink in a pattern of printed ink drops with reference to at least a portion of the image data and reduce the voltage of the electrical signal after the initial number of drops to eject drops of ink in a pattern of printed ink drops with reference to a remaining portion of the image data, and generates the electrical signal.
    Type: Grant
    Filed: August 17, 2017
    Date of Patent: March 5, 2019
    Assignee: XEROX CORPORATION
    Inventors: Douglas Dean Darling, Reid W. Gunnell, Brian Edward Williams
  • Patent number: 10207509
    Abstract: A liquid discharge head includes a nozzle, an individual liquid chamber, and a circulation channel. The nozzle discharges liquid. The individual liquid chamber is communicated with the nozzle. The circulation channel is communicated with the individual liquid chamber. A first direction in which liquid flows in the individual liquid chamber crosses a second direction in which liquid flows in the circulation channel. A liquid-inflow-side opening of the nozzle faces an area in which a flow of liquid changes from the first direction to the second direction.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: February 19, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Toshimichi Odaka, Takahiro Yoshida, Takayuki Nakai
  • Patent number: 10183484
    Abstract: For assessing the functioning of an ejection unit of an inkjet print head, a comparison of a residual pressure wave with a residual pressure wave reference is employed. To enable assessment during printing, multiple residual pressure wave references are provided, each relating to a condition relevant to the residual pressure wave. Such a condition may relate to an actuation status of an adjacent ejection unit which may cause crosstalk, for example. When performing the assessment, the condition during assessment is taken into account, for example for selecting a suitable residual pressure wave reference, such that an appropriate and correct assessment can be performed independent from the conditions during assessment.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: January 22, 2019
    Assignee: OCE-TECHNOLOGIES B.V.
    Inventors: Hylke Veenstra, Marko Mihailovic, Cornelis W. M. Venner, Amol A. Khalate, Tjerk E. C. Hummel
  • Patent number: 10171073
    Abstract: A circuit includes a first driver, a second driver, and one or more monitor modules coupled to the first or second driver to measure slope times of the first or second driver. The circuit further includes a comparator coupled to the one or more monitor modules to compare the slope times of the first and second drivers. The circuit further includes one or more regulators coupled to the comparator and the first or second driver to regulate a slope of the first or second driver, based on output of the comparator, at most once per pulse cycle until the slope of the first or second driver reaches a target slope.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: January 1, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: Pavel Horsky
  • Patent number: 10160201
    Abstract: There is provided a liquid discharging apparatus including a head unit that has a first driving element and discharges a first liquid based on a first drive signal for driving the first driving element and a first control signal for controlling application of the first drive signal to the first driving element and a circuit substrate. First drive signal transmitting wiring through which the first drive signal is transmitted. The shortest distance between a first side of the circuit substrate and the first drive signal transmitting wiring is shorter than the shortest distance between the first drive signal transmitting wiring and the first control signal transmitting wiring. The shortest distance between a second side opposing the first side of the circuit substrate and the first control signal transmitting wiring is shorter than the shortest distance between the first drive signal transmitting wiring and the first control signal transmitting wiring.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: December 25, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Akira Nakajima
  • Patent number: 10160206
    Abstract: Accounting for oscillations with drop ejection waveforms can include identifying a previous ejection waveform having a first plurality of parameters including a time interval from a final pulse of the previous ejection waveform. Accounting for oscillations with drop ejection waveforms can include determining a second plurality of parameters based on the first plurality of parameters, where the second plurality of parameters define a current ejection waveform that accounts for oscillations caused by the previous ejection waveform. Accounting for oscillations with drop ejection waveforms can include applying the current ejection waveform to cause an ejection nozzle of the printhead to generate a desired fluid drop.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: December 25, 2018
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Zhizhang Chen, Tony S. Cruz-Uribe, Peter J. Fricke
  • Patent number: 10131139
    Abstract: There is provided a liquid discharging apparatus configured to discharge liquid, including: a liquid discharging head including a driving element; a driving device configured to drive the driving element; a power unit; a switch configured to perform switching of voltage supply; and a controller. When the power unit is switched on, the controller causes a power supply voltage of the power unit to be raised up to a first voltage while checking the power supply voltage; and the controller controls the switch to start the voltage supply from the power unit to the driving device while the power supply voltage is being raised up to the first voltage; and under a condition that the voltage supply is started while the power supply voltage is being raised up to the first voltage, the controller controls the driving device to apply the voltage to the driving element.
    Type: Grant
    Filed: May 1, 2017
    Date of Patent: November 20, 2018
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Toru Yamashita
  • Patent number: 10124583
    Abstract: A liquid discharge apparatus uses a drive signal including a micro-vibration waveform which causes the piezoelectric element to micro-vibrate such that an ink is not discharged from the nozzle in a case of being applied to the piezoelectric element as the drive signal and a drive waveform which deforms piezoelectric element such that the ink is discharged from the nozzle in a case of being applied to the piezoelectric element as the drive signal. The presentation unit selectably presents the indirect information from which the ink discharge status can be estimated such as the types of ink and the usage status of the ink or the like. The control unit changes the strength of the micro-vibration caused by the micro-vibration waveform based on the indirect information selected on the presentation unit.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: November 13, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Shiki Kumagai
  • Patent number: 10118386
    Abstract: A method for printing waveforms, such as overlong waveforms, can be used to enable the printing of large ink droplets. The method can include determining whether the first waveform is longer than the duration and inducing the continued activation of a nozzle arrangement with the first waveform at a second activation point in time based on the determination that the first waveform is longer than the duration. The method can include the suppression of a new activation of the nozzle arrangement to ensure the execution of the first waveform (e.g., an overlong waveform).
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: November 6, 2018
    Assignee: Océ Holding B.V.
    Inventors: Florian Hitzlsperger, Benno Petschik
  • Patent number: 10118387
    Abstract: A printhead includes an address line, data lines, a fire pulse line, and a plurality of primitives, each primitive corresponding to a different data line and including a plurality of activation devices, each activation device corresponding to a different address of a set of addresses. A buffer receives data packets, each data packet including address data representative of an address of the set of addresses and print data for each primitive corresponding to the address. For each data packet, the buffer directs the address data to address logic and places the print data on the respective data line, and the address logic encodes the address represented by the address data onto the address line. For each primitive, the activation device corresponding to the address on the address bus activates a corresponding primitive function based on the corresponding print data when a fire pulse is present on the fire pulse line.
    Type: Grant
    Filed: August 9, 2017
    Date of Patent: November 6, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Chris Bakker, Eric Martin, Adam L Ghozeil
  • Patent number: 10105954
    Abstract: An inkjet recording device includes a recording head section, a capping unit, a capping movement mechanism, and a capping support section. The recording head section forms an image with ink on paper. The capping unit includes a cap that is contactable to the recording head section. The capping movement mechanism moves the capping unit. The capping support section supports the capping unit. The capping movement mechanism includes a rail section which guides the capping unit in a Y axial direction between standby and retracted positions. The capping support section includes a rail section which guides the capping unit in an X axial direction between the standby position and a detachable position.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: October 23, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Masaki Murashima, Yasuyuki Fukunaga
  • Patent number: 10093096
    Abstract: A printhead of a printer includes a nozzle plate having a first layer, a second layer, and an intermediate channel. The first layer can have at least one fluid chamber for holding an immiscible fluid, and a plurality of ejection fluid chamber for holding an ejection fluid. The second layer can have a plurality of ejection fluid nozzles, one ejection fluid nozzle being in fluid communication with one ejection fluid chamber. The intermediate channel can form a passage between the first layer and the second layer. Further, the intermediate channel is in fluid communication with the fluid chambers to carry the immiscible fluid from the fluid chambers towards each of the ejection fluid nozzles for forming a layer of the immiscible fluid over the ejection fluid chambers to maintain the printhead.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: October 9, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Lawrence H White, Ronald A Askeland
  • Patent number: 10093095
    Abstract: A method for controlling an inkjet printing apparatus performing printing to an elongated printing medium 11, the method having a discharging step of performing continuous application to a piezoelectric element 23 of a nozzle to be used with a pulse number of two or more waves per one printing element to deform the piezoelectric element and thereby discharge ink in an ink chamber 22 from an opening portion 21, and a vibrating step of performing application of the piezoelectric elements 23 to all the nozzles with a pulse number of one wave per one printing element to deform the piezoelectric elements, thereby imparting only vibrations to the inks in the ink chambers 22 without discharging the inks, where the discharging step and the vibrating step are performed alternately.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: October 9, 2018
    Assignee: MIYAKOSHI PRINTING MACHINERY CO., LTD.
    Inventors: Hideo Izawa, Yasushi Katagiri, Seiji Komatsuda
  • Patent number: 10093090
    Abstract: A control system includes a control circuit. The control circuit is to be connected to a head unit including first driving elements and second driving elements. Based on an input print data, the control circuit applies a first signal to the first driving element and applies a second signal to the second driving elements. The control circuit changes the first signal to a third signal in a first time and changes the second signal to a fourth signal in a second time. Based on an input print data, the control circuit applies the third signal to the first driving element and applies the fourth signal to the second driving elements.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: October 9, 2018
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventor: Toru Yamashita
  • Patent number: 10086605
    Abstract: A drive circuit which drives a capacitive load on the basis of a drive signal output from a node includes a first wire; a second wire; an amplification unit; a capacitor and a resistance element; a determination unit which determines whether or not a voltage of a differentiated drive signal is within a predetermined range in case where a magnitude of a voltage change of the signal is less than or equal to a threshold; and a voltage output unit which amplifies the a voltage of the signal by a predetermined multiple, for example, one time, and outputs the amplified signal toward the node in a case where it is determined that the voltage of the differentiated drive signal is within the predetermined range.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: October 2, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Akira Abe
  • Patent number: 10040280
    Abstract: A printhead circuit or driving at least two actuating elements has a trim generating circuit for generating a trim signal using a comparator coupled to receive and compare feedback indicative of a present level of a drive voltage, with a configurable reference voltage value. The trim being based on a drive voltage feedback can give a more direct indication of actuating element output than given by timing references. Hence the trim can be more accurate, can be simpler, without accurate digital timing references, and thus costs can be reduced. It can be combined with a cold switch arrangement.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: August 7, 2018
    Assignee: XAAR TECHNOLOGY LIMITED
    Inventor: Andrew L Van Brocklin
  • Patent number: 10044343
    Abstract: A drive circuit includes a control signal generator configured to generate a control signal based on a drive signal and a source drive signal, and an amplifier including a high-side transistor and a low-side transistor controlled based on the control signal. The amplifier is configured to output the drive signal from an output terminal to drive a capacitive load during a first period in which a voltage of the drive signal changes to be higher than or equal to a first voltage per unit time and a second period in which the voltage changes to be lower than the first voltage or does not change per unit time. The first period includes a period in which one of the high-side and the low-side transistors performs a switching operation. The second period includes a period in which the one of the high-side and the low-side transistors performs a linear operation.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: August 7, 2018
    Assignee: Seiko Epson Corporation
    Inventor: Akira Abe