Patents by Inventor Kenichi Oonuki

Kenichi Oonuki 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: 11020965
    Abstract: Ink in a print head is heated to a target temperature by driving heating elements included in a print head. After heating control is completed, operation that is performed using power stored in a power storage unit is started. The target temperature in the heating control is determined in such a manner that the temperature of the print head when the operation is started is a set temperature or higher.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: June 1, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Daisuke Kobayashi, Kenichi Oonuki, Satoshi Seki, Tsukasa Doi
  • Patent number: 10946646
    Abstract: Heating is conducted sequentially by dividing a heating operation into first heating control and second heating control consuming higher electric power than that in the first heating control.
    Type: Grant
    Filed: July 17, 2019
    Date of Patent: March 16, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Oonuki, Daisuke Kobayashi, Satoshi Seki, Tsukasa Doi
  • Publication number: 20200316933
    Abstract: A printing apparatus according to the present invention includes a printhead with a plurality of print elements for generating energy used for printing an image on a print medium, a first temperature detection element and a second temperature detection element at positions different in a direction of a print element array in which the plurality of print elements are arrayed. The apparatus corrects a signal concerning a head temperature based on an output from the first temperature detection element, and corrects, based on the corrected signal concerning the head temperature, a signal concerning a head temperature output from the second temperature detection element.
    Type: Application
    Filed: March 30, 2020
    Publication date: October 8, 2020
    Inventors: Yushi Suematsu, Daisuke Kobayashi, Kenichi Oonuki
  • Publication number: 20200316948
    Abstract: One embodiment of the present invention is a printing apparatus including: a print head having a printing element column in which a plurality of printing elements for ejecting ink from ejection ports is arrayed and performing printing on a printing medium by ejecting ink based on print data; a sensor that detects temperature of the print head; an acquisition unit configured to acquire information indicating a number of dots to be printed by printing elements corresponding to a predetermined area in the printing element column; and a control unit configured to control a printing operation of the print head based on temperature detected by the sensor and the number of dots acquired by the acquisition unit, and the printing apparatus performs printing on the printing medium by ejecting ink from the print head while the print head and the printing medium are moving relatively.
    Type: Application
    Filed: March 19, 2020
    Publication date: October 8, 2020
    Inventors: Daisuke Kobayashi, Yushi Suematsu, Kenichi Oonuki
  • Publication number: 20200101724
    Abstract: Ink in a print head is heated to a target temperature by driving heating elements included in a print head. After heating control is completed, operation that is performed using power stored in a power storage unit is started. The target temperature in the heating control is determined in such a manner that the temperature of the print head when the operation is started is a set temperature or higher.
    Type: Application
    Filed: September 18, 2019
    Publication date: April 2, 2020
    Inventors: Daisuke Kobayashi, Kenichi Oonuki, Satoshi Seki, Tsukasa Doi
  • Publication number: 20200031115
    Abstract: Heating is conducted sequentially by dividing a heating operation into first heating control and second heating control consuming higher electric power than that in the first heating control.
    Type: Application
    Filed: July 17, 2019
    Publication date: January 30, 2020
    Inventors: Kenichi Oonuki, Daisuke Kobayashi, Satoshi Seki, Tsukasa Doi
  • Patent number: 9545791
    Abstract: When the head temperature Tfinish, which is the head temperature at the time of completion of a preceding scan, is higher than the stable ejection temperature Tstable, the target temperature is made a temperature that is only a temperature value ?T lower than the head temperature Tfinish. On the other hand, when Tfinish, the head temperature at the time of print completion, is lower than the stable ejection temperature Tstable, the target temperature is made a temperature that is only a temperature value ?T higher than the head temperature Tfinish. Because of this it is possible to inhibit head temperature rise in the case where an image with a high print density is printed.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: January 17, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kenichi Oonuki, Hidehiko Kanda, Akiko Aichi, Hirokazu Yoshikawa, Hiroshi Taira
  • Patent number: 9403368
    Abstract: In a case in which a cumulative value ?Nure of wetting coefficients is less than a wetting threshold value THNure, printing is carried out on a unit area through a print mode in which an image is completed through a first number of instances of a scan, and in a case in which the cumulative value ?Nure is equal to or greater than the wetting threshold value THNure, printing is carried out on a unit area through a print mode in which an image is completed through a second number of instances of the scan, where the second number is greater than the first number.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: August 2, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Yoshikawa, Toshiyuki Chikuma, Satoshi Seki, Kenichi Oonuki
  • Patent number: 9033471
    Abstract: In an ink jet printing apparatus and control method using a plurality of parts of a printing unit, ink ejection can be immediately started. First and second heating units heat first and second parts of the printing unit. Each of the first and second heating units performs heating when the temperature of each of the first and second parts of the printing unit is lower than a reference temperature, and stops heating when the temperature of each of the first and second parts of the printing unit is at least equal to the reference temperature. A control unit controls ejecting of ink from the printing unit such that the printing unit starts ejecting ink according to both first and second information, the first and second information indicating that the temperature of the first and second parts of the printing unit once reached the reference temperature under certain circumstances.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: May 19, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Oonuki, Kiichiro Takahashi, Toshiyuki Chikuma, Hirokazu Yoshikawa, Hiroshi Taira, Wakako Tanaka
  • Publication number: 20150022586
    Abstract: In a case in which a cumulative value ?Nure of wetting coefficients is less than a wetting threshold value THNure, printing is carried out on a unit area through a print mode in which an image is completed through a first number of instances of a scan, and in a case in which the cumulative value ?Nure is equal to or greater than the wetting threshold value THNure, printing is carried out on a unit area through a print mode in which an image is completed through a second number of instances of the scan, where the second number is greater than the first number.
    Type: Application
    Filed: July 15, 2014
    Publication date: January 22, 2015
    Inventors: Hirokazu Yoshikawa, Toshiyuki Chikuma, Satoshi Seki, Kenichi Oonuki
  • Patent number: 8888223
    Abstract: An ink jet printing apparatus performs printing on a print medium, and includes a print head having a plurality of ejection openings, a head temperature acquisition unit that acquires a temperature of the print head, and a heating unit configured to heat the print head. In addition, a control unit is configured to control the heating unit so as to cause a temperature of the print head to be a target temperature, at start of a print scan by the print head, and a setting unit is configured to set the target temperature. If a completion temperature acquired by the acquisition unit at a time when a previous print scan is completed is lower than a threshold temperature, the setting unit sets a temperature higher than the completion temperature as the target temperature, and if the completion temperature is equal to or higher than the threshold temperature, the setting unit sets a temperature lower than the completion temperature as the target temperature.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: November 18, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Oonuki, Hidehiko Kanda, Akiko Maru, Hirokazu Yoshikawa, Hiroshi Taira
  • Publication number: 20140300661
    Abstract: When the head temperature Tfinish, which is the head temperature at the time of completion of a preceding scan, is higher than the stable ejection temperature Tstable, the target temperature is made a temperature that is only a temperature value ?T lower than the head temperature Tfinish. On the other hand, when Tfinish, the head temperature at the time of print completion, is lower than the stable ejection temperature Tstable, the target temperature is made a temperature that is only a temperature value ?T higher than the head temperature Tfinish. Because of this it is possible to inhibit head temperature rise in the case where an image with a high print density is printed.
    Type: Application
    Filed: June 23, 2014
    Publication date: October 9, 2014
    Inventors: Kenichi Oonuki, Hidehiko Kanda, Akiko Maru, Hirokazu Yoshikawa, Hiroshi Taira
  • Publication number: 20140292886
    Abstract: In an ink jet printing apparatus and control method using a plurality of parts of a printing unit, ink ejection can be immediately started. First and second heating units heat first and second parts of the printing unit. Each of the first and second heating units performs heating when the temperature of each of the first and second parts of the printing unit is lower than a reference temperature, and stops heating when the temperature of each of the first and second parts of the printing unit is at least equal to the reference temperature. A control unit controls ejecting of ink from the printing unit such that the printing unit starts ejecting ink according to both first and second information, the first and second information indicating that the temperature of the first and second parts of the printing unit once reached the reference temperature under certain circumstances.
    Type: Application
    Filed: June 11, 2014
    Publication date: October 2, 2014
    Inventors: Kenichi Oonuki, Kiichiro Takahashi, Toshiyuki Chikuma, Hirokazu Yoshikawa, Hiroshi Taira, Wakako Tanaka
  • Patent number: 8783832
    Abstract: In an ink jet printing apparatus including a plurality of print heads and a method for controlling the ink jet printing apparatus, ink ejection can be immediately started. If temperatures of both a first print head and a second print head have become equal to or higher than a reference temperature at least once, a printing operation or a preliminary ejection operation using the first print head and the second print head is started even when one of the temperature of the first print head and the temperature of the second print head is lower than the reference temperature.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: July 22, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Oonuki, Kiichiro Takahashi, Toshiyuki Chikuma, Hirokazu Yoshikawa, Hiroshi Taira, Wakako Tanaka
  • Patent number: 8517493
    Abstract: An ink jet printing apparatus and a print head recovery method are provided which effectively execute a preliminary ejection to eject ink not contributing to image printing from nozzle opening of the print head to maintain the ink ejection performance in good condition. The ink in the print head is heated to a first temperature, at which a first preliminary ejection is executed. Then, when the ink temperature falls to a second temperature, which is lower than the first temperature, a second preliminary ejection is executed.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: August 27, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Wakako Yamamoto, Hidehiko Kanda, Hirokazu Tanaka, Kenichi Oonuki
  • Patent number: 8474941
    Abstract: There are provided an inkjet printing apparatus and an inkjet printing method, whereby, the temperature of a print head is controlled and the ejection volume of ink to be ejected is stabilized to print a high-quality image, even at a high printing duty. Based on print data, an ejection number of ink to be ejected into a unit printing area is counted. The print head is heated to a target temperature that is raised in consonance with an increase in the count value.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: July 2, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Tanaka, Hidehiko Kanda, Wakako Yamamoto, Kenichi Oonuki
  • Patent number: 8240804
    Abstract: The present invention uses a temperature sensor to sense the temperature of a print head configured to eject ink, and senses the environmental temperature of a printing apparatus. The temperature of the print head is corrected based on the environmental temperature only if information from the temperature sensor is different from the last information acquired.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: August 14, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirokazu Tanaka, Hidehiko Kanda, Susumu Hirosawa, Wakako Yamamoto, Kenichi Oonuki
  • Publication number: 20110148965
    Abstract: An inkjet printing apparatus of the present invention is equipped with a recovery device for recovering an ink ejection state of a print head. The print head has a plurality of nozzle rows each for ejecting an ink of a different color, and a nozzle surface. The recovery device performs wiping of the nozzle surface and preliminary ejection from the print head. After the wiping, an evaluation patch is created by performing the preliminary ejection onto a printing medium, and the number of preliminary ejections of a specific nozzle is increased to a number larger the number of preliminary ejections of other nozzles based on an image of the evaluation patch. It is possible to appropriately decide the number of preliminary ejections for each nozzle according to color mixture parts that vary for every apparatus.
    Type: Application
    Filed: November 29, 2010
    Publication date: June 23, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hiroshi Taira, Hidehiko Kanda, Akiko Maru, Hirokazu Yoshikawa, Kenichi Oonuki
  • Publication number: 20110085003
    Abstract: When the head temperature Tfinish, which is the head temperature at the time of completion of a preceding scan, is higher than the stable ejection temperature Tstable, the target temperature is made a temperature that is only a temperature value ?T lower than the head temperature Tfinish. On the other hand, when Tfinish, the head temperature at the time of print completion, is lower than the stable ejection temperature Tstable, the target temperature is made a temperature that is only a temperature value ?T higher than the head temperature Tfinish. Because of this it is possible to inhibit head temperature rise in the case where an image with a high print density is printed.
    Type: Application
    Filed: October 1, 2010
    Publication date: April 14, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kenichi Oonuki, Hidehiko Kanda, Akiko Maru, Hirokazu Yoshikawa, Hiroshi Taira
  • Publication number: 20100238226
    Abstract: The present invention uses a temperature sensor to sense the temperature of a print head configured to eject ink, and senses the environmental temperature of a printing apparatus. The temperature of the print head is corrected based on the environmental temperature only if information from the temperature sensor is different from the last information acquired.
    Type: Application
    Filed: March 3, 2010
    Publication date: September 23, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hirokazu Tanaka, Hidehiko Kanda, Susumu Hirosawa, Wakako Yamamoto, Kenichi Oonuki