Patents by Inventor Kenji Yabe

Kenji Yabe 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).

  • Publication number: 20140125735
    Abstract: A print head includes an energy generating element, a chamber for accommodating liquid, and an ejection opening for ejecting liquid from the chamber, thus applying the energy to the liquid in the chamber from the energy generating element to eject the liquid from the ejection opening, wherein the ejection opening includes at least two projections convex to an inside of the ejection opening in a cross section perpendicular to a liquid ejecting direction and has a tapered angle ?1 in regard to the liquid ejecting direction, enabling a meniscus of the liquid to be formed therebetween at the liquid ejecting time, and an outer edge portion has a tapered angle ?2 in regard to the liquid ejecting direction, wherein the tapered angles ?1 and ?2 are defined to meet a formula of 0°??1?10° and a formula of ?2>?1.
    Type: Application
    Filed: May 31, 2012
    Publication date: May 8, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yasunori Takei, Kenji Yabe, Takuma Kodoi, Ken Ikegame, Isamu Horiuchi, Hyou Takahashi
  • Patent number: 8703398
    Abstract: The manufacturing method includes forming, on a surface of a negative photosensitive resin layer formed on a substrate, a hollow having inclinations at both sides in a cross section taken along a plane perpendicular to a row direction of the ejection orifice, and then forming a latent image in the hollow, thereby forming the ejection orifice so that an angle between a side surface portion thereof and a normal to the outer opening in a cross section of the ejection orifice taken along a plane which passes through a center of the ejection orifice and is perpendicular to the row direction is larger than an angle between the side surface portion and the normal to the outer opening in a cross section of the ejection orifice taken along a plane which includes a center line of the ejection orifice in the row direction and is perpendicular to a substrate surface.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: April 22, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ken Ikegame, Isamu Horiuchi, Hyo Takahashi, Takuma Kodoi, Yasunori Takei, Kenji Yabe
  • Publication number: 20140030659
    Abstract: A liquid ejection head is manufactured by forming a dent representing a substantially spherical profile so as to include a position for forming an ejection port on a surface of a photosensitive resin layer, then forming a latent image of the ejection port in the dent by an exposure treatment using a projection lens system, and developing the latent image. The center of the top surface of the latent image is shifted to the incoming side of the beam of exposure light from the lowest point of the dent.
    Type: Application
    Filed: July 11, 2013
    Publication date: January 30, 2014
    Inventors: Takuma Kodoi, Yasunori Takei, Kenji Yabe, Isamu Horiuchi, Hyou Takahashi, Ken Ikegame
  • Patent number: 8579407
    Abstract: An inkjet recording apparatus may include a liquid discharge head and a control unit. The liquid discharge head includes a heat generation resistor to generate thermal energy used for discharging liquid and a protection film disposed in at least one of an upper portion and a lower portion of the heat generation resistor. The control unit measures a minimum energy value required by the heat generation resistor to discharge liquid. In addition, the control unit stops discharge operation of the liquid discharge head when at least one of the energy value and a statistical value of the energy value is less than a threshold.
    Type: Grant
    Filed: January 14, 2011
    Date of Patent: November 12, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenji Yabe
  • Publication number: 20130286098
    Abstract: Provided is a liquid discharge head including: a discharge port that serves to discharge a liquid; a discharge energy generating element that generates energy used to discharge the liquid; a foam chamber that houses the discharge energy generating element and is communicated with the discharge port; and a flow channel that is communicated with the foam chamber and serves to supply the liquid to the foam chamber. An inclined surface is formed between: a side wall of the foam chamber on a side opposite to the flow channel; and a surface of the foam chamber on which the discharge port is formed, and the inclined surface is inclined to a plane on which the discharge energy generating element is formed.
    Type: Application
    Filed: April 17, 2013
    Publication date: October 31, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kenji Yabe, Yasunori Takei, Takuma Kodoi, Ken Ikegame, Isamu Horiuchi, Hyo Takahashi
  • Publication number: 20130266901
    Abstract: The manufacturing method includes forming, on a surface of a negative photosensitive resin layer formed on a substrate, a hollow having inclinations at both sides in a cross section taken along a plane perpendicular to a row direction of the ejection orifice, and then forming a latent image in the hollow, thereby forming the ejection orifice so that an angle between a side surface portion thereof and a normal to the outer opening in a cross section of the ejection orifice taken along a plane which passes through a center of the ejection orifice and is perpendicular to the row direction is larger than an angle between the side surface portion and the normal to the outer opening in a cross section of the ejection orifice taken along a plane which includes a center line of the ejection orifice in the row direction and is perpendicular to a substrate surface.
    Type: Application
    Filed: March 12, 2013
    Publication date: October 10, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Ken Ikegame, Isamu Horiuchi, Hyo Takahashi, Takuma Kodoi, Yasunori Takei, Kenji Yabe
  • Publication number: 20120306969
    Abstract: Without being dependent on design changes, a liquid ejection head and a method of production thereof are provided in which when time-division driving, liquid drop landing deviance in the direction of printing is capable of being corrected. In order to achieve this, before performing an exposure in order to form an ejection port, after forming a cavity that is shifted with respect to the location at which the ejection port is formed, exposure is performed.
    Type: Application
    Filed: May 25, 2012
    Publication date: December 6, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takuma Kodoi, Yasunori Takei, Kenji Yabe, Isamu Horiuchi, Hyo Takahashi, Ken Ikegame
  • Publication number: 20120206539
    Abstract: A manufacture method can form an inkjet printing head by which a plurality of ejection openings have a uniform shape. Heaters adjacent to one another have thereamong a common conductive line commonly connected to these heaters or a dummy conductive line not involved in the energization of the heaters.
    Type: Application
    Filed: January 13, 2012
    Publication date: August 16, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toru Yamane, Kenji Yabe
  • Publication number: 20120200641
    Abstract: A liquid ejection head including an ejection orifice for ejecting a liquid; a flow path for supplying the liquid from a liquid supply port holding the liquid to the ejection orifice; and a heat generating element of a rectangular form with a long-side to short-side ratio of 2.5 or more for generating thermal energy used to eject the liquid, a longitudinal direction of the heat generating element being arranged along an extending direction of the flow path. An end portion of the heat generating element on a downstream side of a liquid flowing direction within the flow path is located between an end portion of the ejection orifice on the downstream side and an end portion of the ejection orifice on an upstream side when viewed from a direction to which the liquid is ejected from the ejection orifice.
    Type: Application
    Filed: January 25, 2012
    Publication date: August 9, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toru Yamane, Tomoyuki Inoue, Eisuke Nishitani, Kenji Yabe, Atsushi Sakamoto
  • Publication number: 20110175963
    Abstract: An inkjet recording apparatus may include a liquid discharge head and a control unit. The liquid discharge head includes a heat generation resistor to generate thermal energy used for discharging liquid and a protection film disposed in at least one of an upper portion and a lower portion of the heat generation resistor. The control unit measures a minimum energy value required by the heat generation resistor to discharge liquid. In addition, the control unit stops discharge operation of the liquid discharge head when at least one of the energy value and a statistical value of the energy value is less than a threshold.
    Type: Application
    Filed: January 14, 2011
    Publication date: July 21, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Kenji Yabe
  • Patent number: 7887159
    Abstract: The present invention provides a liquid ejecting head which inhibits the possible generation of satellites and possible inappropriate ejection during liquid ejection, enabling printing with improved image quality and reliability. Thus, ejection openings in the liquid ejecting head each selectively have projections or a circular shape depending on the characteristics of a liquid to be ejected.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: February 15, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasunori Takei, Shuichi Murakami, Kenji Yabe
  • Patent number: 7527352
    Abstract: An ink jet recording head is provided with one heat generating member in each of ink flow paths, and the discharge port thereof is arranged on the extended line extending in the normal direction from the center of the main surface of the heat generating member to the surface of the substrate. Then, on the surface of the substrate, non-bubbling area is provided on the center within the projected area having the discharge port projected thereon. Bubble brought to the boil by the heat generating member pushes out ink from the discharge port by the pressure exerted by the bubble, while being communicated with the outside. With the structure thus arranged, it is made possible to enhance the precision of discharge direction of the liquid droplet discharged from the discharge port.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: May 5, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mineo Kaneko, Ken Tsuchii, Keiichiro Tsukuda, Masaki Oikawa, Kenji Yabe
  • Publication number: 20090002447
    Abstract: The present invention provides a liquid ejecting head which inhibits the possible generation of satellites and possible inappropriate ejection during liquid ejection, enabling printing with improved image quality and reliability. Thus, ejection openings in the liquid ejecting head each selectively have projections or a circular shape depending on the characteristics of a liquid to be ejected.
    Type: Application
    Filed: May 23, 2008
    Publication date: January 1, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yasunori Takei, Shuichi Murakami, Kenji Yabe
  • Patent number: 7410241
    Abstract: An ink jet head, which can prevent non-discharge due to face wetting, has an ink nozzle for discharging ink through a discharge port communicating with the ink nozzle and formed in a water-repelling surface. A hydrophilic groove is formed in a nozzle plate in which the ink nozzle is formed to be directed toward the water-repelling surface in a concave fashion. The hydrophilic groove is provided between plural nozzle arrays and a capillary force of the hydrophilic groove is greater at end portions thereof than at a central portion thereof.
    Type: Grant
    Filed: September 7, 2005
    Date of Patent: August 12, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenji Yabe
  • Publication number: 20070040190
    Abstract: An ink jet recording head is provided with one heat generating member in each of ink flow paths, and the discharge port thereof is arranged on the extended line extending in the normal direction from the center of the main surface of the heat generating member to the surface of the substrate. Then, on the surface of the substrate, non-bubbling area is provided on the center within the projected area having the discharge port projected thereon. Bubble brought to the boil by the heat generating member pushes out ink from the discharge port by the pressure exerted by the bubble, while being communicated with the outside. With the structure thus arranged, it is made possible to enhance the precision of discharge direction of the liquid droplet discharged from the discharge port.
    Type: Application
    Filed: October 31, 2006
    Publication date: February 22, 2007
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Mineo Kaneko, Ken Tsuchii, Keiichiro Tsukuda, Masaki Oikawa, Kenji Yabe
  • Patent number: 7172264
    Abstract: An ink jet recording head is provided with one heat generating member in each of ink flow paths, and the discharge port thereof is arranged on the extended line extending in the normal direction from the center of the main surface of the heat generating member to the surface of the substrate. Then, on the surface of the substrate, non-bubbling area is provided on the center within the projected area having the discharge port projected thereon. Bubble brought to the boil by the heat generating member pushes out ink from the discharge port by the pressure exerted by the bubble, while being communicated with the outside. With the structure thus arranged, it is made possible to enhance the precision of discharge direction of the liquid droplet discharged from the discharge port.
    Type: Grant
    Filed: November 3, 2005
    Date of Patent: February 6, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mineo Kaneko, Ken Tsuchii, Keiichiro Tsukuda, Masaki Oikawa, Kenji Yabe
  • Patent number: 7077503
    Abstract: An ink jet head according to the present invention includes multiple discharge ports for discharging ink, multiple ink flow paths for communicating with the discharge ports, and heat generating elements for generating bubbles in ink filling the ink flow paths. For each ink flow path, two heat generating elements are arranged therein, and the discharge port is arranged along a line that is extended, from the center of a pressure generation region formed by the two heat generating elements, in the normal direction relative to the surface of the substrate. The arrangement pitch of the heat generating elements is equal to or greater than 600 dpi, and the interval dhn between a partition wall defining an ink flow path and the heat generating element adjacent to the partition wall is equal to or smaller than 4 ?m.
    Type: Grant
    Filed: April 23, 2003
    Date of Patent: July 18, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mineo Kaneko, Ken Tsuchii, Keiichiro Tsukuda, Masaki Oikawa, Kenji Yabe
  • Patent number: 7077500
    Abstract: An ink jet head is provided with a plurality of nozzle arrays formed by many numbers of ink nozzles for discharging large-amount ink droplets and small-amount ink droplets. Although the ink jet head generates heat more on the middle portion thereof, it is cooled by discharges of ink droplets. The degree of cooling is greater by the large-amount ink droplets to be discharged. Thus, on the first column in the main scan direction, the small-amount nozzle array is positioned, and on the second column, the large-amount nozzle array is positioned. In this way, it is made possible to balance the temperature distributions in the main scan direction. As a result, color images can be formed in high quality.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: July 18, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenji Yabe
  • Publication number: 20060077233
    Abstract: An ink jet recording head is provided with one heat generating member in each of ink flow paths, and the discharge port thereof is arranged on the extended line extending in the normal direction from the center of the main surface of the heat generating member to the surface of the substrate. Then, on the surface of the substrate, non-bubbling area is provided on the center within the projected area having the discharge port projected thereon. Bubble brought to the boil by the heat generating member pushes out ink from the discharge port by the pressure exerted by the bubble, while being communicated with the outside. With the structure thus arranged, it is made possible to enhance the precision of discharge direction of the liquid droplet discharged from the discharge port.
    Type: Application
    Filed: November 3, 2005
    Publication date: April 13, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Mineo Kaneko, Ken Tsuchii, Keiichiro Tsukuda, Masaki Oikawa, Kenji Yabe
  • Publication number: 20060055731
    Abstract: The present invention provides an ink jet head which can prevent non-discharge due to face wetting. In the ink jet head according to the present invention which has an ink nozzle for discharging ink and in which the ink is discharged from a discharge port communicated with the ink nozzle and formed in a water-repelling surface toward a print medium, a hydrophilic groove is formed in a nozzle plate in which the ink nozzle is formed to be directed toward the water-repelling surface in a concave fashion. The hydrophilic groove is provided between plural nozzle arrays and a capillary force of the hydrophilic groove is greater at end portions thereof than at a central portion thereof.
    Type: Application
    Filed: September 7, 2005
    Publication date: March 16, 2006
    Applicant: Canon Kabushiki Kaisha
    Inventor: Kenji Yabe