Patents by Inventor Yoshiyuki Nakagawa

Yoshiyuki Nakagawa 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: 20190023016
    Abstract: A liquid ejection head 1 includes an ejection orifice 12 through which a liquid is ejected, a first liquid flow path 13 which is in communication with the ejection orifice 12 and through which the liquid flows, a second liquid flow path 14 which is in communication with the ejection orifice 12 on the opposite side of the first liquid flow 13 with respect to the ejection orifice 12 and through which the liquid flows, a first electrode 21 positioned in the first liquid flow path 13, and a second electrode 22 which is positioned in the second liquid flow path 14 and generates an electro-osmotic flow in the liquid together with the first electrode 21.
    Type: Application
    Filed: September 25, 2018
    Publication date: January 24, 2019
    Inventors: Yoshiyuki Nakagawa, Kazuhiro Yamada, Noriyasu Nagai, Takuro Yamazaki, Toru Nakakubo, Akira Yamamoto, Masafumi Morisue, Ryo Kasai
  • Publication number: 20190023018
    Abstract: The liquid ejection head 1 is provided with: an ejection orifice array 19 arraying multiple ejection orifices 12 in order to eject a liquid; multiple energy-generating elements 11 for generating energy in order to eject the liquid; a substrate 10 provided with the multiple energy-generating elements 11; a through port array 25 arraying multiple through ports 16 penetrating the substrate 10; multiple linear liquid flow paths 13 positioned between the through port array 25 and the ejection orifice array 19, and connected to respective ejection orifices 12 of the ejection orifice array 19 and respective through ports 16 of the through port array 25; and first and second electrode 21 and 22 arranged in each of the multiple liquid flow paths 13, and for generating an electroosmotic flow in the liquid.
    Type: Application
    Filed: September 25, 2018
    Publication date: January 24, 2019
    Inventors: Yoshiyuki Nakagawa, Kazuhiro Yamada, Noriyasu Nagai, Takuro Yamazaki, Toru Nakakubo, Akira Yamamoto, Masafumi Morisue, Ryo Kasai
  • Publication number: 20190023001
    Abstract: A liquid discharging head includes a discharge port that discharges a liquid, a pressure chamber that communicates with the discharge port, and an energy generating element that is disposed in the pressure chamber. In the liquid discharging head, the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port, and an interval between the projections at a location where the projections are closest to each other is 5 ?m or less.
    Type: Application
    Filed: September 27, 2018
    Publication date: January 24, 2019
    Inventors: Takatsugu Moriya, Shuzo Iwanaga, Shintaro Kasai, Yoshiyuki Nakagawa, Akiko Hammura, Tatsuya Yamada, Tomohiro Sato, Ayako Iwasaki, Tomoki Ishiwata, Koichi Ishida
  • Patent number: 10183490
    Abstract: A discharge port array is inclined to a second direction B at an angle ? that satisfies a relation of tan ?=d2/(N×d1), where d1 is a distance between discharge ports within the discharge port array in the second direction B, and d2 is a distance between two adjacent discharge ports within each group in a first direction.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: January 22, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomohiro Sato, Shintaro Kasai, Yoshiyuki Nakagawa, Akiko Saito, Takatsugu Moriya, Koichi Ishida, Tatsuya Yamada, Shuzo Iwanaga, Shingo Okushima
  • Publication number: 20190009554
    Abstract: A liquid ejection head includes a recording element substrate including an ejection orifice for ejecting liquid, a pressure chamber provided with an energy generating element for generating energy used to eject liquid, a liquid supply path for supplying liquid to the pressure chamber, and a liquid collecting path for collecting liquid from the pressure chamber. The liquid supply path, the pressure chamber, and the liquid collecting path of the recording element substrate constitute a part of a circulation path in which liquid flows in the order mentioned. The flow resistance RIn of a flow path including the liquid supply path at a supply side is greater than the flow resistance ROut of a flow path including the liquid collecting path at a collection side.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 10, 2019
    Inventor: Yoshiyuki Nakagawa
  • Publication number: 20190009524
    Abstract: A liquid ejection apparatus includes a supply control section 401 that controls the supply and stop of a liquid to pressure chambers communicating with ejection ports to eject the liquid, and a negative pressure generating section 1004 that generates a negative pressure. The liquid ejection apparatus also includes a negative pressure control unit 230 using the negative pressure generated by the negative pressure generating section 1004 to adjust the pressure of the liquid flowing through a collection channel. To stop a flow of the liquid, the supply control section 401 stops the supply of the liquid, and then the negative pressure generating section 1004 is stopped.
    Type: Application
    Filed: July 3, 2018
    Publication date: January 10, 2019
    Inventors: Yohei Nakamura, Kazuhiro Yamada, Toru Nakakubo, Yoshiyuki Nakagawa, Naozumi Nabeshima
  • Publication number: 20190001672
    Abstract: An ejection energy generating element is provided in a first pressure chamber so that a liquid in the first pressure chamber is ejected from an ejection port. A pressurization energy generating element is provided in a second pressure chamber so that the liquid in the first pressure chamber is pressurized. An opening area of a hole open to the second pressure chamber is smaller than an opening area of the ejection port.
    Type: Application
    Filed: June 21, 2018
    Publication date: January 3, 2019
    Inventors: Akiko Hammura, Yoshiyuki Nakagawa
  • Publication number: 20190001692
    Abstract: In a configuration having a circulation flow path in association with an ejection element, there is provided a liquid ejecting apparatus capable of circulating liquid suitably and maintaining stable ejection operation while reducing liquid vaporization, a power supply capacity, and the effect of noise. For this purpose, in a configuration in which liquid delivery mechanisms that facilitate a flow in a flow path are prepared in association with pressure chambers, the liquid delivery mechanisms are divided into a plurality of blocks and the liquid delivery mechanisms included in each of the blocks are driven at different timings.
    Type: Application
    Filed: June 12, 2018
    Publication date: January 3, 2019
    Inventors: Takuro Yamazaki, Toru Nakakubo, Kazuhiro Yamada, Yoshiyuki Nakagawa, Akiko Hammura
  • Publication number: 20190001671
    Abstract: A liquid ejecting head has a laminated flow path member on which a supply flow path for individually supplying a plurality of liquids to an element substrate and a collection flow path for individually collecting the liquids are formed. The supply flow path includes a first common supply flow path for horizontally leading a first liquid and a second common supply flow path for horizontally leading a second liquid to positions corresponding to a plurality of element substrates. The first and second common supply flow paths are formed in the same layer of the laminated flow path member. The collection flow path includes a first common collection flow path for horizontally collecting the first liquid and a second common collection flow path for horizontally collecting the second liquid from positions corresponding to the plurality of element substrates. The first and second common collection flow paths are formed in the same layer of the laminated flow path member.
    Type: Application
    Filed: May 10, 2018
    Publication date: January 3, 2019
    Inventors: Kazuhiro Yamada, Toru Nakakubo, Yoshiyuki Nakagawa, Shingo Okushima
  • Publication number: 20190001699
    Abstract: The present invention provides a liquid ejecting module capable of performing stable ejection operation while circulating and supplying fresh ink to the vicinity of ejection ports arranged in high density. To achieve this, a liquid ejecting module includes an element arranged face in which a plurality of ejecting elements are arranged, a circulation flow path including a supply flow path which supplies liquid to a pressure chamber and a collection flow path which collects liquid from the pressure chamber, and a liquid delivery mechanism provided in the circulation flow path for circulating liquid in the pressure chamber. The liquid delivery mechanism is located lower than the element arranged face.
    Type: Application
    Filed: June 1, 2018
    Publication date: January 3, 2019
    Inventors: Toru Nakakubo, Takuro Yamazaki, Kazuhiro Yamada, Yoshiyuki Nakagawa
  • Publication number: 20190001698
    Abstract: A plurality of pressure chambers are formed in a circulation channel for liquid in order to array ejection ports in a high density in association with the circulation channel. The circulation channel is connected to a penetration supply path and a penetration recovery path that penetrate a substrate.
    Type: Application
    Filed: May 30, 2018
    Publication date: January 3, 2019
    Inventors: Takuro Yamazaki, Toru Nakakubo, Kazuhiro Yamada, Yoshiyuki Nakagawa, Yoshihiro Hamada, Koichi Ishida, Shingo Okushima
  • Patent number: 10166771
    Abstract: A liquid ejection method includes ejecting liquid from an ejection opening, using a liquid ejection head including a heating surface configured to heat the liquid and the ejection opening corresponding to the heating surface, by heating the liquid with the heating surface to produce a bubble communicating with air through the ejection opening such that at least a part of the heating surface is exposed to the air through the ejection opening, wherein the liquid is heated with the heating surface for 0.5 microseconds or shorter to produce a bubble communicating with the air through the ejection opening such that at least a part of the heating surface is exposed to the air through the ejection opening, in order to eject the liquid from the ejection opening.
    Type: Grant
    Filed: July 11, 2017
    Date of Patent: January 1, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shintaro Kasai, Yoshiyuki Nakagawa, Akiko Saito, Shinji Kishikawa
  • Publication number: 20180370230
    Abstract: In a circulating system which circulates liquid within a liquid ejecting head, thickening of liquid in the vicinity of an ejection port can be more securely suppressed. The ejection port includes a first ejection port disposed in an upstream side in an ejecting direction of ink and a second ejection port disposed in a downstream side in the ejecting direction. The second ejection port includes an enlarged diameter portion whose diameter is enlarged in a radially outward manner from at least a part of an opening edge portion of the first ejection port.
    Type: Application
    Filed: June 5, 2018
    Publication date: December 27, 2018
    Inventors: Yoshiyuki Nakagawa, Takuro Yamazaki, Kazuhiro Yamada, Toru Nakakubo
  • Patent number: 10150291
    Abstract: Provided is an inkjet print head capable of favorably cleaning an ejection port surface and also of improving landing accuracy of ejected ink onto a print medium. For that purpose, a conductive layer formed of a conductive material is formed on a support substrate, flattening processing is executed, and a liquid ejection substrate is mounted on the support substrate with good positional accuracy without protrusion of a sealant for protecting an electric connection portion of the liquid ejection substrate from the ejection port surface.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: December 11, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yoshiyuki Nakagawa
  • Patent number: 10112387
    Abstract: A liquid discharging head includes a discharge port that discharges a liquid, a pressure chamber that communicates with the discharge port, and an energy generating element that is disposed in the pressure chamber. In the liquid discharging head, the discharge port is provided with a plurality of projections that project towards a central portion of the discharge port from an inner peripheral edge of the discharge port, and an interval between the projections at a location where the projections are closest to each other is 5 ?m or less.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: October 30, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takatsugu Moriya, Shuzo Iwanaga, Shintaro Kasai, Yoshiyuki Nakagawa, Akiko Saito, Tatsuya Yamada, Tomohiro Sato, Ayako Iwasaki, Tomoki Ishiwata, Koichi Ishida
  • Publication number: 20180272718
    Abstract: A liquid ejection head includes an ejection opening; a passage in which an energy generation element is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage; and an outflow passage for allowing the liquid to flow out to the outside. An expression of H?0.34×P?0.66×W>1.7 is satisfied when a height of the passage is set to H, a length of the ejection opening portion is set to P, and a length of the ejection opening portion is set to W.
    Type: Application
    Filed: May 29, 2018
    Publication date: September 27, 2018
    Inventors: Shingo Okushima, Seiichiro Karita, Takatsuna Aoki, Noriyasu Nagai, Eisuke Nishitani, Yoshiyuki Nakagawa
  • Publication number: 20180244039
    Abstract: In a printing apparatus including a circulation system circulating a liquid, a volatile component included in the liquid evaporates from an ejection opening and thus characteristics of the liquid involving with concentration or viscosity change. The invention provides a printing apparatus that uses a liquid ejection head including an ejection opening ejecting a liquid, a print element generating energy for ejecting a liquid, and a pressure chamber having the print element provided therein, the printing apparatus including: a circulator configured to circulate the liquid so that the liquid passes through the pressure chamber; and a concentration adjustment unit configured to adjust a concentration of a liquid inside a liquid circulation system by discharging the liquid from the inside of the liquid circulation system and replenishing the liquid into the liquid circulation system from the outside of the liquid circulation system in response to the amount of the discharged liquid.
    Type: Application
    Filed: April 27, 2018
    Publication date: August 30, 2018
    Inventors: SEIICHIRO KARITA, Shuzo Iwanaga, Kazuhiro Yamada, Takatsuna Aoki, Shingo Okushima, Zentaro Tamenaga, Yumi Komamiya, Noriyasu Nagai, Tatsurou Mori, Yoshiyuki Nakagawa, Akira Yamamoto
  • Publication number: 20180247967
    Abstract: There is provided a photoelectric conversion device in which a distance from a main surface to an inner surface of a first part of a dielectric film is smaller than a distance from the main surface to a top surface of a light shielding member, a distance from the main surface to an outer surface of the first part is smaller than a distance from the main surface to an outer surface of a second part of the dielectric film, an outer surface of a third part inclines to the top surface, a surface of a dielectric member inclines to the top surface, between the dielectric film and the top surface in a normal direction, and the dielectric member has a refractive index lower than a refractive index of the dielectric film.
    Type: Application
    Filed: February 26, 2018
    Publication date: August 30, 2018
    Inventors: Akihiro Kawano, Yoshiyuki Nakagawa, Masao Ishioka, Takashi Okagawa
  • Patent number: 10040288
    Abstract: A liquid ejection module and a liquid ejection head capable of suppressing unevenness in printing are provided. Accordingly, openings are disposed so that a center position of at least one of openings in a plurality of ejection opening rows is not disposed on the same line extending in a print medium movement direction in a relative movement with respect to center positions of the other openings.
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: August 7, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takatsugu Moriya, Shintaro Kasai, Yoshiyuki Nakagawa, Akiko Saito, Koichi Ishida, Tatsuya Yamada, Shuzo Iwanaga, Ayako Tozuka, Tomoki Ishiwata, Tomohiro Sato
  • Patent number: 10040290
    Abstract: A liquid ejection head includes an ejection opening; a passage in which an energy generation element is disposed; an ejection opening portion that allows communication between the ejection opening and the passage; a supply passage for allowing the liquid to flow into the passage; and an outflow passage for allowing the liquid to flow out to the outside. An expression of H?0.34×P?0.66×W>1.7 is satisfied when a height of the passage is set to H, a length of the ejection opening portion is set to P, and a length of the ejection opening portion is set to W.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: August 7, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shingo Okushima, Seiichiro Karita, Takatsuna Aoki, Noriyasu Nagai, Eisuke Nishitani, Yoshiyuki Nakagawa