Patents by Inventor Eiichi Nakata

Eiichi Nakata 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: 10280326
    Abstract: An ink jet recording method includes: performing application of aqueous ink onto a unit area by one relative scanning with a recording head and a recording medium to record an image, wherein the aqueous ink comprises a self-dispersion pigment, a urethane resin, and polyethylene glycol, a kind of the self-dispersion pigment is carbon black, number average molecular weight of the polyethylene glycol is 600 or more, and viscosity of the aqueous ink is 5 mPa·s or more.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: May 7, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Arihiro Saito, Kouhei Nakagawa, Eiichi Nakata, Yoshihide Aikawa
  • Publication number: 20190111692
    Abstract: An ink tank is used for an ink jet recording apparatus and includes an ink storage bag storing an ink, and the ink storage bag has no mechanism for allowing a side wall portion to shrink into a preliminary defined shape but has a side wall portion to shrink as the ink flows out. The ink tank has no mechanism for adjusting the pressure in the ink storage bag, the ink storage bag is made from a resin, the ink is an aqueous ink containing a coloring material and a water-soluble organic solvent, and the difference between the average SP of the water-soluble organic solvent and the SP of the resin constituting the ink storage bag is 2.0 (cal/cm3)1/2 or more. An ink jet recording apparatus includes the ink tank and a recording head that ejects an ink supplied from the ink tank by an ink jet method.
    Type: Application
    Filed: October 10, 2018
    Publication date: April 18, 2019
    Inventors: MAKI MOTOMURA, Taro Endo, Eiichi Nakata
  • Publication number: 20190111711
    Abstract: To provide an ink jet recording method using facedown discharge and capable of obtaining a recorded matter being suppressed a generation of minus curl. The method provided is an ink jet recording method including a step of recording an image on a recording medium having a first surface and a second surface by ejecting an aqueous ink from a recording head. This method further includes, after the recording step, a step of discharging the recording medium while placing the first surface or the second surface on which the image has been recorded last on a gravitationally lower side. In this method, the aqueous ink has a viscosity rp of 5.0 mPa·s or more and a difference ?2??1 between a viscosity ?2 of an evaporated ink obtained by evaporating 20% by mass of the aqueous ink and the viscosity rp of the aqueous ink is 4.0 mPa·s or more.
    Type: Application
    Filed: September 21, 2018
    Publication date: April 18, 2019
    Inventors: Eiichi Nakata, Minako Kawabe
  • Publication number: 20190111691
    Abstract: An ink tank is used for an ink jet recording apparatus and includes an ink storage bag storing an ink, and the ink storage bag has no mechanism for allowing a side wall portion to shrink into a preliminary defined shape but has a side wall portion to shrink as the ink flows out. The ink tank has no mechanism for adjusting the pressure in the ink storage bag, the ink storage bag is made from a polyolefin resin, the ink is an aqueous ink containing a coloring material and a resin, and the resin contained in the ink has a glass transition temperature higher than the glass transition temperature of the polyolefin resin constituting the ink storage bag. An ink jet recording apparatus includes the ink tank and a recording head that eject an ink supplied from the ink tank by an ink jet method.
    Type: Application
    Filed: October 10, 2018
    Publication date: April 18, 2019
    Inventors: Eiichi Nakata, Taro Endo, Maki Motomura
  • Publication number: 20180134907
    Abstract: An ink jet recording method includes: performing application of aqueous ink onto a unit area by one relative scanning with a recording head and a recording medium to record an image, wherein the aqueous ink comprises a self-dispersion pigment, a urethane resin, and polyethylene glycol, a kind of the self-dispersion pigment is carbon black, number average molecular weight of the polyethylene glycol is 600 or more, and viscosity of the aqueous ink is 5 mPa·s or more.
    Type: Application
    Filed: November 9, 2017
    Publication date: May 17, 2018
    Inventors: Arihiro Saito, Kouhei Nakagawa, Eiichi Nakata, Yoshihide Aikawa
  • Patent number: 9605170
    Abstract: Provided is an ink set enabling the recording of images that have excellent color developability and bronzing resistance and have suppressed a coloring by fringe when a clear ink and a pigment ink are used in combination. An aqueous ink set includes a combination of a first ink containing no coloring material and a second ink containing a coloring material.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: March 28, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kouhei Nakagawa, Eiichi Nakata, Hirofumi Ichinose
  • Patent number: 9598592
    Abstract: Provided is an ink set enabling the recording of images that have excellent gloss clarity and bronzing resistance and have suppressed an occurrence of fringe unevenness when a clear ink and a pigment ink are used in combination. The aqueous ink set includes a combination of a first ink containing no coloring material and a second ink containing a coloring material.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: March 21, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Eiichi Nakata, Hirofumi Ichinose, Kouhei Nakagawa
  • Publication number: 20160222236
    Abstract: Provided is an ink set enabling the recording of images that have excellent color developability and bronzing resistance and have suppressed a coloring by fringe when a clear ink and a pigment ink are used in combination. An aqueous ink set includes a combination of a first ink containing no coloring material and a second ink containing a coloring material.
    Type: Application
    Filed: January 20, 2016
    Publication date: August 4, 2016
    Inventors: Kouhei Nakagawa, Eiichi Nakata, Hirofumi Ichinose
  • Publication number: 20160222239
    Abstract: Provided is an ink set enabling the recording of images that have excellent gloss clarity and bronzing resistance and have suppressed an occurrence of fringe unevenness when a clear ink and a pigment ink are used in combination. The aqueous ink set includes a combination of a first ink containing no coloring material and a second ink containing a coloring material.
    Type: Application
    Filed: January 20, 2016
    Publication date: August 4, 2016
    Inventors: Eiichi Nakata, Hirofumi Ichinose, Kouhei Nakagawa
  • Patent number: 9187662
    Abstract: An ink containing water, a water-soluble organic solvent and an organic pigment, wherein a primary particle of the organic pigment has a ratio (minor axis b)/(major axis a) of 0.70 or more and a particle diameter of 35 nm or less, the ink contains a water-soluble organic solvent with a dielectric constant of 25.0 or less in an amount of 0.5% by mass or more based on the total mass of the ink, and a dielectric constant ?mix of the ink as calculated according to the following equation (1) is 66-72: ?mix=?n?nrn/?nrn??Equation (1): wherein n means a kind of water or the water-soluble organic solvent, ?n is a dielectric constant of water or the water-soluble organic solvent represented by n, and rn is a content of water or the water-soluble organic solvent represented by n based on the total mass of the ink.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: November 17, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masashi Yamamoto, Eiichi Nakata, Shuichi Okazaki, Satoshi Takebayashi
  • Patent number: 8834621
    Abstract: Provided is a pigment particle suitable for an ink capable of recording an image that is excellent in color developability and lightfastness, and has a yellow hue. The pigment particle is a pigment particle having a structure represented by the following formula (1), in which a maximum absorption wavelength of an absorption spectrum in a wavelength region of 200 nm or more and 800 nm or less is present in a range of 340 nm or more and 360 nm or less.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: September 16, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Takebayashi, Yoshio Nakajima, Shuichi Okazaki, Eiichi Nakata
  • Publication number: 20140198151
    Abstract: An ink containing water, a water-soluble organic solvent and an organic pigment, wherein a primary particle of the organic pigment has a ratio (minor axis b)/(major axis a) of 0.70 or more and a particle diameter of 35 nm or less, the ink contains a water-soluble organic solvent with a dielectric constant of 25.0 or less in an amount of 0.5% by mass or more based on the total mass of the ink, and a dielectric constant ?mix of the ink as calculated according to the following equation (1) is 66-72: ?mix=?n?nrn/?nrn??Equation (1): wherein n means a kind of water or the water-soluble organic solvent, ?n is a dielectric constant of water or the water-soluble organic solvent represented by n, and rn is a content of water or the water-soluble organic solvent represented by n based on the total mass of the ink.
    Type: Application
    Filed: February 27, 2013
    Publication date: July 17, 2014
    Inventors: Masashi Yamamoto, Eiichi Nakata, Shuichi Okazaki, Satoshi Takebayashi
  • Patent number: 8730520
    Abstract: An image processing method includes the steps of converting input image data to ink color data corresponding to each amount of a plurality of colors of achromatic inks used for printing, and generating printing data for first, second and third achromatic inks based on the ink color data. The printing data is used for printing by causing a printing head to scan a common image area in a printing medium a plurality of times, the printing head ejecting the plurality of colors of inks.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: May 20, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuji Konno, Hinako Iritani, Yuji Hamasaki, Takeshi Yazawa, Satoshi Seki, Eiichi Nakata
  • Patent number: 8636350
    Abstract: An ink includes a plurality of pigments, a plurality of water-soluble polymers, a surfactant, and a water-soluble organic solvent. The surfactant includes a polyoxyethylene alkyl ether having an HLB value of 13.0 or more as a value determined by a Griffin method, the plurality of pigments include C.I. Pigment Yellow 74 and C.I. Pigment Yellow 128, the plurality of water-soluble polymers include an acrylic polymer and a urethane polymer, and the water-soluble organic solvent includes a compound represented by the following Formula (1): HO—(CH2CH2O)n—H, wherein n is an integer of 1 to 4.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: January 28, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Takayama, Eiichi Nakata, Yoshio Nakajima, Yuhei Shimizu
  • Patent number: 8602547
    Abstract: Provided are an ink suitable for ink jet recording with which a color image excellent in both color developability and glossiness can be recorded, and an ink cartridge and an ink jet recording method in each of which the ink is utilized. Specifically, provided are an ink including: an organic pigment; a resin for dispersing the organic pigment; and a resin fine particle, in which an average particle diameter of the resin fine particle is 0.60 time or more and 1.2 times or less as large as an average particle diameter of the organic pigment, and an ink cartridge and an ink jet recording method in each of which the ink is utilized.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: December 10, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Eiichi Nakata, Hideki Takayama, Yoshio Nakajima, Yuhei Shimizu
  • Patent number: 8602546
    Abstract: Provided are an ink with which an image excellent in both black density and glossiness can be recorded, and an ink cartridge and an ink jet recording method each using the ink. The ink includes: a carbon black; a resin for dispersing the carbon black; a resin fine particle; and a water-soluble organic solvent, in which: the resin fine particle contains at least a unit derived from an ethylenically unsaturated hydrophobic monomer, and a unit derived from a monomer selected from an ethylenically unsaturated acid monomer and a salt thereof, and a ratio of a unit derived from a saturated alkyl group-containing monomer to the unit derived from the ethylenically unsaturated hydrophobic monomer is 95.0 mass % or more; and the water-soluble organic solvent contains a water-soluble organic solvent having a dielectric constant at 20° C. of 18.0 or more and less than 30.0.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: December 10, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuhei Shimizu, Eiichi Nakata, Hideki Takayama, Yoshio Nakajima
  • Publication number: 20130063518
    Abstract: Provided is a pigment particle suitable for an ink capable of recording an image that is excellent in color developability and lightfastness, and has a yellow hue. The pigment particle is a pigment particle having a structure represented by the following formula (1), in which a maximum absorption wavelength of an absorption spectrum in a wavelength region of 200 nm or more and 800 nm or less is present in a range of 340 nm or more and 360 nm or less.
    Type: Application
    Filed: August 17, 2012
    Publication date: March 14, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Satoshi Takebayashi, Yoshio Nakajima, Shuichi Okazaki, Eiichi Nakata
  • Publication number: 20120050383
    Abstract: An ink includes a plurality of pigments, a plurality of water-soluble polymers, a surfactant, and a water-soluble organic solvent. The surfactant includes a polyoxyethylene alkyl ether having an HLB value of 13.0 or more as a value determined by a Griffin method, the plurality of pigments include C.I. Pigment Yellow 74 and C.I. Pigment Yellow 128, the plurality of water-soluble polymers include an acrylic polymer and a urethane polymer, and the water-soluble organic solvent includes a compound represented by the following Formula (1): HO—(CH2CH2O)n—H, wherein n is an integer of 1 to 4.
    Type: Application
    Filed: August 22, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hideki Takayama, Eiichi Nakata, Yoshio Nakajima, Yuhei Shimizu
  • Publication number: 20120050762
    Abstract: The present invention suppresses a bronzing phenomenon that occurs easily in inkjet printing that uses pigment ink, and minimizes other effects on the image quality by particularly minimizing the change in gray balance. Of at least first and second achromatic inks having different densities of pigment coloring material, the amount of resin in the second achromatic ink (light gray ink) having the lowest density of coloring material is increased, and on the achromatic color axis, a specified amount of light gray ink is used up to gradations other than highlighted areas, and light gray ink is printed in scans after all the inks that include the second achromatic ink. As a result, it is possible to reduce the bronzing phenomenon.
    Type: Application
    Filed: August 3, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yuji Konno, Hinako Iritani, Yuji Hamasaki, Takeshi Yazawa, Satoshi Seki, Eiichi Nakata
  • Publication number: 20120050386
    Abstract: Provided are an ink with which an image excellent in both black density and glossiness can be recorded, and an ink cartridge and an ink jet recording method each using the ink. The ink includes: a carbon black; a resin for dispersing the carbon black; a resin fine particle; and a water-soluble organic solvent, in which: the resin fine particle contains at least a unit derived from an ethylenically unsaturated hydrophobic monomer, and a unit derived from a monomer selected from an ethylenically unsaturated acid monomer and a salt thereof, and a ratio of a unit derived from a saturated alkyl group-containing monomer to the unit derived from the ethylenically unsaturated hydrophobic monomer is 95.0 mass % or more; and the water-soluble organic solvent contains a water-soluble organic solvent having a dielectric constant at 20° C. of 18.0 or more and less than 30.0.
    Type: Application
    Filed: August 24, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yuhei Shimizu, Eiichi Nakata, Hideki Takayama, Yoshio Nakajima