Patents by Inventor Yasuhito Komai

Yasuhito Komai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10549529
    Abstract: According to one embodiment, a driving device includes a head driver configured to generate and apply a driving signal to an actuator for ejecting a liquid from a pressure chamber connected to a nozzle, the driving signal including a contraction pulse, the contraction pulse causing the actuator to contract a volume of the pressure chamber, and end application of the contraction pulse when a flow rate of the liquid from the nozzle has a negative value in a liquid ejection direction from the nozzle.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: February 4, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Jun Takamura, Yasuhito Komai, Takanori Gomi
  • Patent number: 10416346
    Abstract: A photosensor includes a light projection unit, a light receiving unit, a determination unit that determines a magnitude relation between a received light quantity of the light receiving unit and a threshold value set for the received light quantity; and a threshold value setting unit that sets the threshold value of the received light quantity. The threshold value setting unit calculates for each of a plurality of different wavelength regions, a contrast difference that is a difference between a received light quantity obtained when projection is performed on a detection target on a surface of a workpiece and a received light quantity obtained when projection is performed on a background on the surface of the workpiece, and updates the threshold value based on the contrast difference for a wavelength region among the plurality of wavelength regions in which the contrast difference has a maximum value.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: September 17, 2019
    Assignee: OMRON Corporation
    Inventors: Hironobu Morita, Motoharu Okuno, Yasuhito Uetsuji, Kazunari Komai, Takuya Matsushima, Yusuke Iida, Seho Seo
  • Publication number: 20190118533
    Abstract: A fluid ejection head comprises a pressure chamber and a nozzle plate including a nozzle group. The nozzle plate has a discharge face with an upstream side and a downstream side. The nozzle group is in fluid communication with the pressure chamber. The nozzle group includes at least a first nozzle on the upstream side of the discharge face, a second nozzle on the downstream side of the discharge face, and a third nozzle between the first and second nozzles. A flow channel dimension of the third nozzle is different from flow channel dimensions of the first and second nozzles.
    Type: Application
    Filed: September 27, 2018
    Publication date: April 25, 2019
    Inventors: Isao SUZUKI, Yasuhito KOMAI
  • Publication number: 20180345661
    Abstract: According to one embodiment, a driving device includes a head driver configured to generate and apply a driving signal to an actuator for ejecting a liquid from a pressure chamber connected to a nozzle, the driving signal including a contraction pulse, the contraction pulse causing the actuator to contract a volume of the pressure chamber, and end application of the contraction pulse when a flow rate of the liquid from the nozzle has a negative value in a liquid ejection direction from the nozzle.
    Type: Application
    Filed: June 5, 2018
    Publication date: December 6, 2018
    Inventors: Jun TAKAMURA, Yasuhito KOMAI, Takanori GOMI
  • Patent number: 9950521
    Abstract: In accordance with an embodiment, an inkjet head comprises a pressure chamber configured to house ink; an actuator configured to be arranged corresponding to the pressure chamber; a plate configured to have a nozzle communicating with the pressure chamber; and a driving circuit configured to drive the actuator, wherein the drive circuit applies an auxiliary pulse signal which contains an expansion pulse for expanding the volume of the pressure chamber and a contraction pulse for contracting the volume of the pressure chamber in such a degree as not to eject an ink drop from the nozzle to the actuator before enabling the ink drop to be ejected from the nozzle communicating with the pressure chamber by applying the expansion pulse and the contraction pulse as a drive pulse signals.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: April 24, 2018
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Noboru Nitta, Yasuhito Komai
  • Publication number: 20170259564
    Abstract: In accordance with an embodiment, an inkjet head comprises a pressure chamber configured to house ink; an actuator configured to be arranged corresponding to the pressure chamber; a plate configured to have a nozzle communicating with the pressure chamber; and a driving circuit configured to drive the actuator, wherein the drive circuit applies an auxiliary pulse signal which contains an expansion pulse for expanding the volume of the pressure chamber and a contraction pulse for contracting the volume of the pressure chamber in such a degree as not to eject an ink drop from the nozzle to the actuator before enabling the ink drop to be ejected from the nozzle communicating with the pressure chamber by applying the expansion pulse and the contraction pulse as a drive pulse signals.
    Type: Application
    Filed: May 31, 2017
    Publication date: September 14, 2017
    Inventors: Noboru Nitta, Yasuhito Komai
  • Patent number: 9694577
    Abstract: In accordance with an embodiment, an inkjet head comprises a pressure chamber configured to house ink; an actuator configured to be arranged corresponding to the pressure chamber; a plate configured to have a nozzle communicating with the pressure chamber; and a driving circuit configured to drive the actuator, wherein the drive circuit applies an auxiliary pulse signal which contains an expansion pulse for expanding the volume of the pressure chamber and a contraction pulse for contracting the volume of the pressure chamber in such a degree as not to eject an ink drop from the nozzle to the actuator before enabling the ink drop to be ejected from the nozzle communicating with the pressure chamber by applying the expansion pulse and the contraction pulse as a drive pulse signals.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: July 4, 2017
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA TEC KABUSHIKI KAISHA
    Inventors: Noboru Nitta, Yasuhito Komai
  • Publication number: 20170008280
    Abstract: In accordance with an embodiment, an inkjet head comprises a pressure chamber configured to house ink; an actuator configured to be arranged corresponding to the pressure chamber; a plate configured to have a nozzle communicating with the pressure chamber; and a driving circuit configured to drive the actuator, wherein the drive circuit applies an auxiliary pulse signal which contains an expansion pulse for expanding the volume of the pressure chamber and a contraction pulse for contracting the volume of the pressure chamber in such a degree as not to eject an ink drop from the nozzle to the actuator before enabling the ink drop to be ejected from the nozzle communicating with the pressure chamber by applying the expansion pulse and the contraction pulse as a drive pulse signals.
    Type: Application
    Filed: July 6, 2016
    Publication date: January 12, 2017
    Inventors: Noboru Nitta, Yasuhito Komai
  • Patent number: 7857406
    Abstract: An inkjet head driving apparatus which drives an inkjet head for use in gradation printing which is performed to cause a capacity of each of a plurality of pressure chambers filled with ink to be changed by a drive pulse applied to an actuator, an ink drop to be emitted onto a recording medium from a nozzle communicating with the corresponding pressure chamber, and the number of ink drops emitted to be controlled according to the number of drive pulses, the driving apparatus including a drive signal generating section which applies a deboost pulse to decrease pressure in the pressure chamber before the drive pulse for emitting a first drop of ink is applied, wherein the deboost pulse includes a pulse applied to expand or contract the capacity of the pressure chamber for a predetermined length of time, and a quiescent time following the pulse.
    Type: Grant
    Filed: March 19, 2008
    Date of Patent: December 28, 2010
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventor: Yasuhito Komai
  • Publication number: 20080252672
    Abstract: An inkjet head driving apparatus which drives an inkjet head for use in gradation printing which is performed to cause a capacity of each of a plurality of pressure chambers filled with ink to be changed by a drive pulse applied to an actuator, an ink drop to be emitted onto a recording medium from a nozzle communicating with the corresponding pressure chamber, and the number of ink drops emitted to be controlled according to the number of drive pulses, the driving apparatus including a drive signal generating section which applies a deboost pulse to decrease pressure in the pressure chamber before the drive pulse for emitting a first drop of ink is applied, wherein the deboost pulse includes a pulse applied to expand or contract the capacity of the pressure chamber for a predetermined length of time, and a quiescent time following the pulse.
    Type: Application
    Filed: March 19, 2008
    Publication date: October 16, 2008
    Applicant: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Yasuhito Komai
  • Patent number: 6813104
    Abstract: A magnetic write control apparatus transports a medium having a magnetic stripe, until the magnetic stripe reaches a magnetic write position. The apparatus moves a magnetic head and the medium relative to each other, thereby to perform magnetic writing on the magnetic stripe. The magnetic head magnetically writes prescribed data on the magnetic stripe, asynchronously with the relative motion of the magnetic head and the medium.
    Type: Grant
    Filed: September 13, 2001
    Date of Patent: November 2, 2004
    Assignee: Toshiba Tec Kabushiki Kaisha
    Inventor: Yasuhito Komai
  • Publication number: 20030048556
    Abstract: A magnetic write control apparatus transports a medium having a magnetic stripe, until the magnetic stripe reaches a magnetic write position. The apparatus moves a magnetic head and the medium relative to each other, thereby to perform magnetic writing on the magnetic stripe. The magnetic head magnetically writes prescribed data on the magnetic stripe, asynchronously with the relative motion of the magnetic head and the medium.
    Type: Application
    Filed: September 13, 2001
    Publication date: March 13, 2003
    Applicant: Toshiba Tec Kabushiki Kaisha
    Inventor: Yasuhito Komai