Patents by Inventor Akiko Bannai

Akiko Bannai 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: 11565528
    Abstract: An inkjet printing device including: an ink storage unit configured to store an ink; an ejection head having a nozzle configured to eject the ink to a printing material; a heating unit configured to heat the printing material; and a washing unit configured to wash a nozzle-formed surface of the head with a washing liquid, wherein the ink is a clear ink including a resin, the device has a low gloss printing mode that is a printing mode for applying low gloss and a high gloss printing mode that is a printing mode for applying high gloss, and the inkjet printing device satisfies: Tmatte>Tgloss where Tmatte (degrees Celsius) is a temperature of the heating unit when printing is performed with the low gloss printing mode, and Tgloss (degrees Celsius) is a temperature of the heating unit when printing is performed with the high gloss printing mode.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: January 31, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Mio Akima, Hiroaki Takahashi, Akiko Bannai
  • Publication number: 20220403192
    Abstract: A liquid composition contains a coloring material, an organic solvent, a compound represented by Chemical Formula 1 below, a resin, and water, wherein the contact angle of water against a liquid composition film formed by attaching the liquid composition to a non-permeable printing medium is 60 degrees or less, where n represents an integer of from 4 to 10.
    Type: Application
    Filed: June 10, 2022
    Publication date: December 22, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Masaki KUDO, Yukiko Ishijima, Akiko Bannai
  • Publication number: 20220389258
    Abstract: A clear ink includes resin particles and water, wherein a volume average particle diameter of the resin particles is 50 nm or less, and wherein a dried film of the clear ink has glass transition temperatures (Tg) at 50 degrees C. or higher and at lower than 0 degrees C.
    Type: Application
    Filed: December 2, 2020
    Publication date: December 8, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroaki TAKAHASHI, Akiko Bannai, Kiminori Masuda, Yukiko Takamura
  • Patent number: 11472199
    Abstract: Inkjet printing apparatus including: ink accommodating unit storing ink; ejection head configured to eject the ink to form print layer; and heating unit configured to heat print target, wherein the ink is clear ink including resin and water, dry film of the clear ink has glass transition temperature of 50° C. or more, the inkjet printing apparatus has first printing mode and second printing mode, and the heating unit is configured to heat the print target so that expression: Tmatte>Tgloss is satisfied, where the Tmatte is temperature (° C.) of the print target in printing region printed in the first printing mode obtained when the clear ink is deposited on the print target, and the Tgloss is temperature (° C.) of the print target in printing region printed in the second printing mode obtained when the clear ink is deposited on the print target.
    Type: Grant
    Filed: December 3, 2020
    Date of Patent: October 18, 2022
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takahashi, Akiko Bannai, Kiminori Masuda, Yukiko Takamura
  • Patent number: 11261342
    Abstract: Provided is a cleaning solution including: water; a compound represented by general formula (1) below; a glycol ether solves in an amount of greater than 5 g in 100 g of water having a temperature of 25 degrees C., and a proportion of the glycol ether compound is 1 percent by mass or greater but 30 percent by mass or less, and wherein in general formula (1) below, R1 represents an alkyl group containing 1 or more but 4 or less carbon atoms.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: March 1, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Shizuka Kohzuki, Akiko Bannai
  • Publication number: 20210362503
    Abstract: An inkjet printing device including: an ink storage unit configured to store an ink; an ejection head having a nozzle configured to eject the ink to a printing material; a heating unit configured to heat the printing material; and a washing unit configured to wash a nozzle-formed surface of the head with a washing liquid, wherein the ink is a clear ink including a resin, the device has a low gloss printing mode that is a printing mode for applying low gloss and a high gloss printing mode that is a printing mode for applying high gloss, and the inkjet printing device satisfies: Tmatte>Tgloss where Tmatte (degrees Celsius) is a temperature of the heating unit when printing is performed with the low gloss printing mode, and Tgloss (degrees Celsius) is a temperature of the heating unit when printing is performed with the high gloss printing mode.
    Type: Application
    Filed: August 30, 2019
    Publication date: November 25, 2021
    Inventors: Mio AKIMA, Hiroaki TAKAHASHI, Akiko BANNAI
  • Patent number: 11179940
    Abstract: A liquid discharging device includes a liquid discharging head including a nozzle and having a nozzle forming surface, the liquid discharging head configured to discharge a liquid through the nozzle, a wiping member configured to wipe the nozzle forming surface, the wiping member having a first layer configured to be brought into contact with the nozzle forming surface and at least one more layer, and a cleaning liquid that is applied to the nozzle forming surface, wherein the static surface tension of the cleaning liquid is greater than the static surface tension of the liquid.
    Type: Grant
    Filed: November 22, 2019
    Date of Patent: November 23, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Akiko Bannai, Takumi Atake, Yohta Sakon, Hiroko Ohkura
  • Patent number: 11130343
    Abstract: A wiping device includes a wiping member configured to wipe a nozzle forming surface of a liquid discharging head that discharges a liquid from a nozzle, the wiping member having a first layer configured to be brought into contact with the nozzle forming surface and at least one more layer, and a cleaning liquid that is applied to the nozzle forming surface, the cleaning liquid containing a compound represented by the following Chemical formula 1 and a glycol ether compound, where R1 represents an alkyl group having one to four carbon atoms.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: September 28, 2021
    Assignee: RICOH COMPANY, LTD.
    Inventors: Akiko Bannai, Takumi Atake, Yohta Sakon, Hiroko Ohkura
  • Publication number: 20210170778
    Abstract: Inkjet printing apparatus including: ink accommodating unit storing ink; ejection head configured to eject the ink to form print layer; and heating unit configured to heat print target, wherein the ink is clear ink including resin and water, dry film of the clear ink has glass transition temperature of 50° C. or more, the inkjet printing apparatus has first printing mode and second printing mode, and the heating unit is configured to heat the print target so that expression: Tmatte>Tgloss is satisfied, where the Tmatte is temperature (° C.) of the print target in printing region printed in the first printing mode obtained when the clear ink is deposited on the print target, and the Tgloss is temperature (° C.) of the print target in printing region printed in the second printing mode obtained when the clear ink is deposited on the print target.
    Type: Application
    Filed: December 3, 2020
    Publication date: June 10, 2021
    Inventors: Hiroaki TAKAHASHI, Akiko BANNAI, Kiminori MASUDA, Yukiko TAKAMURA
  • Publication number: 20200164650
    Abstract: A wiping device includes a wiping member configured to wipe a nozzle forming surface of a liquid discharging head that discharges a liquid from a nozzle, the wiping member having a first layer configured to be brought into contact with the nozzle forming surface and at least one more layer, and a cleaning liquid that is applied to the nozzle forming surface, the cleaning liquid containing a compound represented by the following Chemical formula 1 and a glycol ether compound, where R1 represents an alkyl group having one to four carbon atoms.
    Type: Application
    Filed: November 26, 2019
    Publication date: May 28, 2020
    Inventors: Akiko BANNAI, Takumi ATAKE, Yohta SAKON, Hiroko OHKURA
  • Publication number: 20200164652
    Abstract: A liquid discharging device includes a liquid discharging head including a nozzle and having a nozzle forming surface, the liquid discharging head configured to discharge a liquid through the nozzle, a wiping member configured to wipe the nozzle forming surface, the wiping member having a first layer configured to be brought into contact with the nozzle forming surface and at least one more layer, and a cleaning liquid that is applied to the nozzle forming surface, wherein the static surface tension of the cleaning liquid is greater than the static surface tension of the liquid.
    Type: Application
    Filed: November 22, 2019
    Publication date: May 28, 2020
    Inventors: Akiko BANNAI, Takumi ATAKE, Yohta SAKON, Hiroko OHKURA
  • Publication number: 20190270903
    Abstract: Provided is a cleaning solution including: water; a compound represented by general formula (1) below; a glycol ether solves in an amount of greater than 5 g in 100 g of water having a temperature of 25 degrees C., and a proportion of the glycol ether compound is 1 percent by mass or greater but 30 percent by mass or less, and wherein in general formula (1) below, R1 represents an alkyl group containing 1 or more but 4 or less carbon atoms.
    Type: Application
    Filed: October 24, 2017
    Publication date: September 5, 2019
    Inventors: Shizuka KOHZUKI, Akiko BANNAI
  • Patent number: 10301487
    Abstract: An inkjet recording device includes an ink, a discharging head to discharge the ink to a recording medium, and a cleaning liquid, wherein the ink comprises water, a urethane resin having a glass transition temperature of 0 degrees C. or lower, a pigment, a compound represented by the following Chemical formula 1, and a surfactant, wherein the cleaning liquid comprises water, a compound represented by the following Chemical formula 1, a glycol ether compound, and a surfactant, where Me represents a methyl group, R1 represents an alkyl group having 1 to 4 carbon atoms.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: May 28, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takahashi, Michihiko Namba, Masahiro Kido, Yuta Nakamura, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Patent number: 10189262
    Abstract: A cleaning liquid for rinsing an ink adhering to an article includes water and a first organic solvent, wherein a liquid mixture of the water and the first organic solvent has a Hansen solubility parameter including a hydrogen bond term of 10.0 (cal/cm3)1/2 or less, wherein the ink includes water, a second organic solvent, a polyurethane resin particle, and a polysiloxane surfactant having an HLB value of 8 or less, wherein the polyurethane resin particle accounts for 5 percent by mass or more of a total amount of the ink.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: January 29, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuta Nakamura, Michihiko Namba, Masahiro Kido, Hiroaki Takahashi, Hikaru Kobayashi, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Patent number: 10040961
    Abstract: Provided is a cleaning solution used for cleaning an ink containing a resin in an amount of 5 percent by mass or greater, the cleaning solution including a mixture solvent containing water and a solvent, wherein a hydrogen bond term of a Hansen solubility parameter of the mixture solvent is 7.0 (cal/cm3)1/2 or less.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: August 7, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Shizuka Kohzuki, Akiko Bannai
  • Publication number: 20180208783
    Abstract: An inkjet recording device includes an ink, a discharging head to discharge the ink to a recording medium, and a cleaning liquid, wherein the ink comprises water, a urethane resin having a glass transition temperature of 0 degrees C. or lower, a pigment, a compound represented by the following Chemical formula 1, and a surfactant, wherein the cleaning liquid comprises water, a compound represented by the following Chemical formula 1, a glycol ether compound, and a surfactant, where Me represents a methyl group, R1 represents an alkyl group having 1 to 4 carbon atoms.
    Type: Application
    Filed: January 19, 2018
    Publication date: July 26, 2018
    Inventors: Hiroaki TAKAHASHI, Michihiko Namba, Masahiro Kido, Yuta Nakamura, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Publication number: 20180170061
    Abstract: A cleaning liquid for rinsing an ink adhering to an article includes water and a first organic solvent, wherein a liquid mixture of the water and the first organic solvent has a Hansen solubility parameter including a hydrogen bond term of 10.0 (cal/cm3)1/2 or less, wherein the ink includes water, a second organic solvent, a polyurethane resin particle, and a polysiloxane surfactant having an HLB value of 8 or less, wherein the polyurethane resin particle accounts for 5 percent by mass or more of a total amount of the ink.
    Type: Application
    Filed: December 14, 2017
    Publication date: June 21, 2018
    Inventors: Yuta NAKAMURA, Michihiko Namba, Masahiro Kido, Hiroaki Takahashi, Hikaru Kobayashi, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Patent number: 9879144
    Abstract: Provided is cleaning solution used for cleaning ink containing water and resin, cleaning solution containing water and solvent. Solvent contains glycol ether compound represented by general formula 1. Ink film obtained by drying the ink has swelling ratio of 20 percent or higher but 150 percent or lower, where swelling ratio is calculated by mathematical formula 1 based on masses of ink film before/after immersed in cleaning solution at 25 degrees C. for 24 hours, R1(OR2)XOR3??General formula 1 In general formula 1, R1 and R3 represent hydrogen atom or alkyl group including from 1 through 4 carbon atoms, R2 represents alkyl group including from 2 through 3 carbon atoms, and X represents integer of from 1 through 4, Swelling ratio(%)=100×[(B?A)/A]??Mathematical formula 1 In mathematical formula 1, A represents mass of ink film before immersed, and B represents mass of ink film after immersed.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: January 30, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Shizuka Kohzuki, Akiko Bannai
  • Publication number: 20170267879
    Abstract: Provided is cleaning solution used for cleaning ink containing water and resin, cleaning solution containing water and solvent. Solvent contains glycol ether compound represented by general formula 1. Ink film obtained by drying the ink has swelling ratio of 20 percent or higher but 150 percent or lower, where swelling ratio is calculated by mathematical formula 1 based on masses of ink film before/after immersed in cleaning solution at 25 degrees C. for 24 hours, R1(OR2)XOR3??General formula 1 In general formula 1, R1 and R3 represent hydrogen atom or alkyl group including from 1 through 4 carbon atoms, R2 represents alkyl group including from 2 through 3 carbon atoms, and X represents integer of from 1 through 4, Swelling ratio (%)=100×[(B?A)/A]??Mathematical formula 1 In mathematical formula 1, A represents mass of ink film before immersed, and B represents mass of ink film after immersed.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 21, 2017
    Inventors: Shizuka KOHZUKI, Akiko BANNAI
  • Patent number: 9757942
    Abstract: An inkjet recording method performed by inkjet recording device including nozzle plate with nozzle to eject droplets of ink; recording head including liquid chamber with which the nozzle is in communication, and pressure-generating unit configured to generate pressure in the liquid chamber; and signal-generating unit configured to generate signal applied to the pressure-generating unit, and allowing the droplets of the ink to eject by the pressure generated by the pressure-generating unit according to the signal, wherein the ink has static surface tension of 18.0 mN/m to 27.0 mN/m at 25° C., the ink has receding contact angle on the nozzle plate of less than 50°, the signal has two-step pull pulse for pulling the ink into the nozzle in two-step manner within one printing unit cycle, and the method includes pulling the ink located in proximity to nozzle outlet into the nozzle of the two-step pull pulse, to form meniscus at predetermined position.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: September 12, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiminori Masuda, Akiko Bannai, Takashi Tamai, Naoko Kitaoka, Kohta Akiyama