Patents by Inventor Ryo Kasai

Ryo Kasai 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: 10717273
    Abstract: A liquid ejection head includes an ejection orifice through which a liquid is ejected, a first liquid flow path which is in communication with the ejection orifice and through which the liquid flows, a second liquid flow path which is in communication with the ejection orifice on the opposite side of the first liquid flow path with respect to the ejection orifice 12 and through which the liquid flows, a first electrode positioned in the first liquid flow path 13, and a second electrode which is positioned in the second liquid flow path and generates an electro-osmotic flow in the liquid together with the first electrode.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: July 21, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiyuki Nakagawa, Kazuhiro Yamada, Noriyasu Nagai, Takuro Yamazaki, Toru Nakakubo, Akira Yamamoto, Masafumi Morisue, Ryo Kasai
  • Patent number: 10703105
    Abstract: A liquid ejection head is provided with an ejection orifice array having multiple ejection orifices in order to eject a liquid; multiple energy-generating elements for generating energy in order to eject the liquid; a substrate provided with the energy-generating elements; a through-port array having multiple through-ports penetrating the substrate; multiple linear liquid flow paths positioned between the through-port array and the ejection orifice array and connected to respective ejection orifices of the ejection orifice array and respective through-ports of the through-port array; and first and second electrodes arranged in each of the multiple liquid flow paths for generating an electroosmotic flow in the liquid.
    Type: Grant
    Filed: September 25, 2018
    Date of Patent: July 7, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiyuki Nakagawa, Kazuhiro Yamada, Noriyasu Nagai, Takuro Yamazaki, Toru Nakakubo, Akira Yamamoto, Masafumi Morisue, Ryo Kasai
  • Patent number: 10703100
    Abstract: Provided is a liquid ejection head including: a substrate; an energy-generating element, which is arranged on the substrate, and is used for ejecting a liquid; a flow path forming member, which has an ejection orifice for ejecting the liquid, and is configured to form a flow path of the liquid between the flow path forming member and the substrate; an electrode configured to generate a flow of the liquid; and a wiring, which is arranged so as to be brought into contact with the flow path forming member, and is configured to supply electric power to the electrode, in which the flow path forming member contains an organic material, and in which the electrode and the wiring are each formed of a conductive adhesive layer containing at least one of conductive diamond-like carbon or tin-doped indium oxide.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: July 7, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masafumi Morisue, Yoshiyuki Nakagawa, Kazuhiro Yamada, Takuro Yamazaki, Ryo Kasai, Tomoko Kudo, Takashi Sugawara
  • Publication number: 20200207101
    Abstract: A liquid ejection head includes: a print element substrate including multiple ejection openings, pressure chambers, a common flow path, and pumps, the pump being configured to circulate liquid between the common flow path and the pressure chamber; and a flow path member laminated to the print element substrate. The flow path member includes a supply flow path and a collection flow path, the supply flow path being configured to supply liquid to the print element substrate, the collection flow path being configured to collect liquid that is not ejected. The supply flow path and the collection flow path have liquid connection with the same common flow path. A circulating pump generates a flow of liquid flowing in an order of the supply flow path, the common flow path, and the collection flow path, the circulating pump being provided at a position different from the print element substrate.
    Type: Application
    Filed: December 11, 2019
    Publication date: July 2, 2020
    Inventors: Kazuhiro Yamada, Yoshiyuki Nakagawa, Toru Nakakubo, Ryo Kasai, Takuro Yamazaki
  • Publication number: 20200207086
    Abstract: An object of the present disclosure is to densely arrange ejection orifices while suppressing decrease in liquid flow speed. A channel extending through a pressure chamber extends in a direction crossing an ejection orifice array L such that a liquid flows between the two ends of the channel located on the sides of the ejection orifice array L.
    Type: Application
    Filed: November 13, 2019
    Publication date: July 2, 2020
    Inventors: Yoshiyuki Nakagawa, Kazuhiro Yamada, Takuro Yamazaki, Toru Nakakubo, Ryo Kasai
  • Publication number: 20200198346
    Abstract: According to an embodiment of the present disclosure, to improve a layout efficiency of an element substrate to be integrated in a printhead and reduce a production cost of the element substrate, a driving method and a size of a first driver transistor used for driving a first heater for ink circulation and a driving method and a size of a second driver transistor used for driving a second heater for discharging ink to print are optimized, respectively. More specifically, the first driver transistor and the second driver transistor have multi-finger configurations, gate widths of the multi-finger configurations are equal to each other, and the number of fingers forming each first driver transistor is different from the number of fingers forming each second driver transistor.
    Type: Application
    Filed: December 9, 2019
    Publication date: June 25, 2020
    Inventors: Ryo Kasai, Kazuhiro Yamada, Takuro Yamazaki, Yoshiyuki Nakagawa, Toru Nakakubo
  • Publication number: 20200198335
    Abstract: An object is to make it possible to stably eject a liquid from an ejection port by mitigating thickening of the liquid by evaporation from the ejection port. One embodiment of the present invention is a liquid ejection head that has: a support substrate; a liquid chamber arranged on the support substrate and provided with an energy generating element for generating energy necessary for ejection of a liquid and an ejection port from which the liquid is ejected; and a circulation flow path of the liquid that passes through the liquid chamber, and the liquid ejection head further has: a first circulating element that forms a first circulatory flow in the circulation flow path; and a second circulating element that forms a second circulatory flow inside the liquid chamber and a driving frequency of the first circulating element is lower than a driving frequency of the second circulating element.
    Type: Application
    Filed: December 19, 2019
    Publication date: June 25, 2020
    Inventors: Takuro Yamazaki, Yoshiyuki Nakagawa, Toru Nakakubo, Kazuhiro Yamada, Ryo Kasai
  • Publication number: 20200198342
    Abstract: Provided are a liquid ejection head, a liquid ejection apparatus, and a liquid ejection method capable of sufficiently suppressing the thickening of a liquid in an ejection orifice. To achieve the object, a liquid ejection head comprises: a pressure chamber; a channel in which a liquid is caused to flow through the pressure chamber; an ejection orifice communicating with the pressure chamber; and an ejection energy generation element configured to eject the liquid in the pressure chamber from the ejection orifice. The ejection orifice is such that a meniscus of the liquid is formed at an end portion of the ejection orifice communicating with the pressure chamber.
    Type: Application
    Filed: December 18, 2019
    Publication date: June 25, 2020
    Inventors: Yoshiyuki Nakagawa, Kazuhiro Yamada, Takuro Yamazaki, Toru Nakakubo, Ryo Kasai
  • Patent number: 10668719
    Abstract: A recording element substrate includes a substrate, a plurality of energy generating elements arranged on the substrate to form an element row, a plurality of supply ports arranged along the element row to form a supply port row, and a plurality of supply paths extending from the plurality of supply ports along the thickness direction of the substrate, wherein a plurality of beam portions disposed between adjacent supply ports in the direction of the supply port row has a plurality of conductor layers in which a conductor layer including a power supply conductor connected to the energy generating elements and a conductor layer including a ground conductor connected to the energy generating elements, are stacked along the thickness direction of the substrate, and wherein at least one of the plurality of conductor layers is occupied by one power supply conductor or one ground conductor.
    Type: Grant
    Filed: September 21, 2018
    Date of Patent: June 2, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masataka Sakurai, Nobuyuki Hirayama, Ryo Kasai, Kengo Umeda, Hidenori Yamato, Masanobu Ohmura, Tatsuhito Goden
  • Publication number: 20200139703
    Abstract: A liquid ejection head includes a pair of electrodes disposed on a first surface of a substrate forming part of a flow path for a liquid. The pair of electrodes are adjacent to each other in a transverse direction of the electrodes, and the liquid moves in the transverse direction upon application of a voltage across the electrodes. The electrodes each include a ridge portion disposed on the first surface and an electrode wiring line connected to a power source for applying the voltage. The electrode wiring line covers an upper surface of the ridge portion and side surfaces of the ridge portion and extends from parts covering the side surfaces of the ridge portion to a downstream side and an upstream side in a direction in which the liquid moves, so as to cover the first surface.
    Type: Application
    Filed: November 1, 2019
    Publication date: May 7, 2020
    Inventors: Takashi Sugawara, Masafumi Morisue, Yoshiyuki Nakagawa, Kazuhiro Yamada, Takuro Yamazaki, Ryo Kasai, Tomoko Kudo
  • Patent number: 10639888
    Abstract: A liquid ejection head including a substrate, an energy generating element which is provided on the substrate and is used for ejecting a liquid, a flow passage forming member which includes an ejection orifice, which ejects the liquid, and which forms a flow passage of the liquid between the flow passage forming member and the substrate, and an electrode which is provided on a surface of the flow passage forming member which adjoins the flow passage and which generates a flow of the liquid, in which at least a portion of the electrode is covered within the flow passage forming member.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: May 5, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masafumi Morisue, Yoshiyuki Nakagawa, Kazuhiro Yamada, Takuro Yamazaki, Ryo Kasai, Tomoko Kudo, Takashi Sugawara
  • Patent number: 10596816
    Abstract: A liquid ejection head substrate has heating unit and an element array in which a plurality of ejection energy generating elements generating ejection energy for liquid ejection are arranged on a surface side of a base material. The heating unit includes a heating element extending in a direction of the element array and generating heat by being energized, wiring spaced apart from the heating element in a direction orthogonal to the surface of the base material, and a plurality of connecting portions connecting the heating element and the wiring to each other. The heating element, the wiring, and the plurality of connecting portions are provided in a region overlapping a region where the element array is disposed in a direction orthogonal to the direction of the element array when seen from the direction orthogonal to the surface of the base material. A current flows to the wiring in a middle of a path of the current flowing through the heating element when the heating element is energized.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: March 24, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Ryo Kasai
  • Patent number: 10532565
    Abstract: In a print element substrate: if an amount of a voltage drop when the number of print elements driven simultaneously in a state in which the predetermined voltage is applied with respect to one print element array is largest is set as an amount of a voltage drop of the print element array, and a sum of amounts of voltage drops of the print element arrays assigned to one group is set as an amount of a voltage drop of the group, a difference between a largest value and a smallest value of the amounts of the voltage drops of the M groups is smaller than a largest value of the amounts of the voltage drops of the N print element arrays.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: January 14, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yohei Osuki, Masataka Sakurai, Ryo Kasai, Kengo Umeda, Hidenori Yamato
  • Publication number: 20200009864
    Abstract: Provided is a liquid ejecting head including an element substrate including: a common liquid chamber connected to a liquid supply source; a pressure chamber connected to the common liquid chamber and including inside an element to generate energy used for ejecting liquid; a bubble generating chamber connected to the common liquid chamber and including inside a pump to cause a flow of the liquid; and a connection flow path connecting the pressure chamber and the bubble generating chamber, in which the liquid ejecting head includes a first anti-cavitation film over the element to generate the energy and a second anti-cavitation film over the pump, and the first anti-cavitation film and the second anti-cavitation film have different film thicknesses.
    Type: Application
    Filed: June 12, 2019
    Publication date: January 9, 2020
    Inventors: Masafumi Morisue, Yoshiyuki Nakagawa, Kazuhiro Yamada, Takuro Yamazaki, Ryo Kasai, Tomoko Kudo, Takashi Sugawara
  • Publication number: 20190381790
    Abstract: A printing apparatus, comprises: a printhead substrate; an application circuit for applying a driving signal to the driving element; a ground line connected to the application circuit; a plurality of temperature sensors that detects temperature relate to the printhead substrate, wherein the cathode side of the plurality of temperature sensors connects the ground line via a resistance; a first selection circuit, on an anode side of the plurality of temperature sensors, that selects one temperature sensor; a second selection circuit, on the cathode side of the plurality of temperature sensor, that selects the one temperature sensor; and a temperature signal output circuit that outputs a temperature signal in accordance with a difference between a voltage of an anode side and a voltage of a cathode side of the selected temperature sensor.
    Type: Application
    Filed: August 1, 2019
    Publication date: December 19, 2019
    Inventors: Ryo Kasai, Kengo Umeda, Takamitsu Tokuda
  • Patent number: 10479075
    Abstract: A print head substrate includes: a substrate surface including a plurality of printing elements and a plurality of pads disposed along a first side and electrically connected to the printing elements, the substrate surface having an acute angle portion formed by the first side and a second side; and a test element group (TEG) area including a TEG not electrically connected to the printing elements, at least a part of the TEG area being located between the second side and a pad closest to a vertex of the acute angle portion among the pads.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: November 19, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryo Kasai, Masataka Sakurai, Koichi Ishida
  • Patent number: 10427400
    Abstract: A printhead comprises a printing element, a driving circuit configured to drive the printing element, an analog signal processing circuit configured to process one or more analog signals, a bias circuit configured to supply a bias voltage to the analog signal processing circuit, and a control terminal to which a control signal is inputted. In a state in which the analog signal processing circuit and the bias circuit are receiving a supply of power, it is possible to switch starting and stopping of at least one of the analog signal processing circuit and the bias circuit based on the control signal.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: October 1, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hidenori Yamato, Hideo Kanno, Masataka Sakurai, Ryo Kasai, Kengo Umeda
  • Patent number: 10406808
    Abstract: A printing apparatus, comprises: a printhead substrate; an application circuit for applying a driving signal to the driving element; a ground line connected to the application circuit; a plurality of temperature sensors that detects temperature relate to the printhead substrate, wherein the cathode side of the plurality of temperature sensors connects the ground line via a resistance; a first selection circuit, on an anode side of the plurality of temperature sensors, that selects one temperature sensor; a second selection circuit, on the cathode side of the plurality of temperature sensor, that selects the one temperature sensor; and a temperature signal output circuit that outputs a temperature signal in accordance with a difference between a voltage of an anode side and a voltage of a cathode side of the selected temperature sensor.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: September 10, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Ryo Kasai, Kengo Umeda, Takamitsu Tokuda
  • Patent number: 10391788
    Abstract: An element substrate, comprises: a plurality of printing elements configured to discharge liquid; a plurality of first driving elements disposed in correspondence with the plurality of printing elements and configured to drive the plurality of printing elements; a plurality of heating elements configured to heat the element substrate; a plurality of second driving elements disposed in correspondence with the plurality of heating elements and configured to drive the plurality of heating elements; and a delay unit that delays timing of driving the plurality of second driving elements to drive the plurality of second driving elements at a predetermined time difference when driving the plurality of second driving elements simultaneously.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: August 27, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kengo Umeda, Ryo Kasai
  • Publication number: 20190232644
    Abstract: A printhead includes a printing element; a first power supply wiring configured to be electrically connected to one terminal of the printing element and supply power to the printing element; a transistor configured to be electrically connected to another terminal of the printing element and drive the printing element; a first ground wiring configured to be electrically connected to a source of the transistor; a second ground wiring configured to be electrically connected to a back gate of the transistor; and a first capacitive element configured to be electrically connected, at one terminal thereof, to the first ground wiring and electrically connected at another terminal thereof, to the second ground wiring.
    Type: Application
    Filed: April 11, 2019
    Publication date: August 1, 2019
    Inventors: Kengo Umeda, Ryo Kasai