Patents by Inventor Daisuke Kumaki

Daisuke Kumaki 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: 20220265146
    Abstract: An evaluation test apparatus is configured to evaluate or test measurement precision of a biological information measurement device configured to measure biological information. The evaluation test apparatus includes: a function generator configured to generate a plurality of input waveform signals by a predetermined operation; an indenter configured to pressure a piezoelectric element of the biological information measurement device; a vibration driver selected from a motor and a solenoid and configured to vibrate the indenter; and a control board configured to control the vibration driver. The control board includes an adder configured to combine the plurality of input waveform signals generated by the function generator. The vibration driver vibrates the indenter based on a composite waveform signal combined by the adder.
    Type: Application
    Filed: February 9, 2022
    Publication date: August 25, 2022
    Applicant: NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY
    Inventors: Daisuke KUMAKI, Shizuo TOKITO
  • Patent number: 11389115
    Abstract: A piezoelectric sensor configured to detect a change of pressure from a living body in a predetermined location includes: a pair of electrodes spaced from one another and formed to spread as a sheet; a pressure-sensitive layer disposed between the pair of electrodes and configured to generate electric charge in response to the change of pressure; a pair of terminals connected to the pair of electrodes, respectively, and configured to output an electrical signal supplied from the pair of electrodes in response to the change of pressure of the living body. An edge of at least one of the pair of electrodes extending toward the pair of terminals is disposed to protrude outside the pressure-sensitive layer, and the electrical signal propagates through the edge and is outputted from the pair of terminals.
    Type: Grant
    Filed: March 27, 2020
    Date of Patent: July 19, 2022
    Assignee: NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY
    Inventors: Daisuke Kumaki, Junichi Toukairin, Shizuo Tokito
  • Publication number: 20220039748
    Abstract: A piezoelectric sensor configured to detect a change of pressure from a living body in a predetermined location includes: a pair of electrodes spaced from one another and formed to spread as a sheet; a pressure-sensitive layer disposed between the pair of electrodes and configured to generate electric charge in response to the change of pressure; a pair of terminals connected to the pair of electrodes, respectively, and configured to output an electrical signal supplied from the pair of electrodes in response to the change of pressure of the living body. An edge of at least one of the pair of electrodes extending toward the pair of terminals is disposed to protrude outside the pressure-sensitive layer, and the electrical signal propagates through the edge and is outputted from the pair of terminals.
    Type: Application
    Filed: March 27, 2020
    Publication date: February 10, 2022
    Inventors: DAISUKE KUMAKI, JUNICHI TOUKAIRIN, SHIZUO TOKITO
  • Publication number: 20220000396
    Abstract: A living body detection device configured to detect a presence of a living body in a predetermined location. The living body detection device includes a piezoelectric element configured to detect a pressure change in the predetermined location, and a processor configured to: calculate multiple pieces of living body information, based on the pressure change detected by the piezoelectric element; calculate a composite index which compositively indicates that the multiple pieces of living body information are caused by the living body, based on the calculated multiple pieces of living body information; and determine whether there is or not the living body in the predetermined location, based on the calculated composite index.
    Type: Application
    Filed: September 21, 2021
    Publication date: January 6, 2022
    Applicant: National University Corporation Yamagata University
    Inventors: Daisuke KUMAKI, Hiroto SATO, Shizuo TOKITO
  • Patent number: 10886497
    Abstract: In the present invention, a light-emitting element operating at low driving voltage, consuming low power, emitting light with good color purity and manufactured in high yields can be obtained. A light-emitting element is disclosed with a configuration composed of a first layer containing a light-emitting material, a second layer, a third layer are formed sequentially over an anode to be interposed between the anode and a cathode in such a way that the third layer is formed to be in contact with the cathode. The second layer is made from n-type semiconductor, a mixture including that, or a mixture of an organic compound having a carrier transporting property and a material having a high electron donor property. The third layer is made from p-type semiconductor, a mixture including that, or a mixture of an organic compound having a carrier transporting property and a material having a high electron acceptor property.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: January 5, 2021
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kumaki, Satoshi Seo
  • Patent number: 10821506
    Abstract: A method for producing a silver nanoparticle dispersion according to the present invention includes the steps of mixing an amine compound, a resin, and a silver salt to yield a complex compound; and heating and decomposing the complex compound to form silver nanoparticles. A silver nanoparticle ink can be obtained by adding an organic solvent to the silver nanoparticle dispersion obtained by this method. The resin includes, for example, a polymer exhibiting viscosity at a temperature within the range of 20° C. to 50° C. or a high molecular weight compound exhibiting viscosity at a temperature within the range of 20° C. to 50° C.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: November 3, 2020
    Assignee: NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY
    Inventors: Konami Izumi, Daisuke Kumaki, Shizuo Tokito, Daisuke Shiokawa
  • Patent number: 10497894
    Abstract: It is an object of the present invention to provide a light-emitting element having a layer containing a light-emitting material and a transparent conductive film between a pair of electrodes, in which electric erosion of the transparent conductive film and metal can be prevented, and also to provide a light-emitting device using the light-emitting element. According to one feature of the invention, a light-emitting element includes a first layer 102 containing a light-emitting material, a second layer 103 containing a material having a donor level, a third layer 104 including a transparent conductive film, and a fourth layer 105 containing a hole-transporting medium between a first electrode 101 and a second electrode 106, in which the first layer 102, the second layer 103, the third layer 104, the fourth layer 105, and the second electrode 106 are provided sequentially, in which the second electrode 106 has a layer containing metal.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: December 3, 2019
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kumaki, Satoshi Seo
  • Patent number: 10193068
    Abstract: Provided is a method of manufacturing a thin film transistor satisfying the relation of L<5 ?m. The method includes a process of forming a streak portion by performing transfer printing on a support using a release member which is provided with an ink streak portion for forming source and drain electrodes and has mold releasability, and baking the streak portion to thereby form the source electrode constituted by a conductor and the drain electrode constituted by a conductor. In the method manufacturing a thin film transistor in which the source and drain electrodes obtained above, a semiconductor layer, an insulator layer, and a gate electrode constituted by a conductor are laminated, after the baking, in a laminated cross section of the thin film transistor to be manufactured is set to A and a channel length thereof is set to L, the ink streak portion is provided so as to satisfy the condition of L/A?0.05.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: January 29, 2019
    Assignees: DIS Corporation, National University Corporation Yamagata University
    Inventors: Tomoko Okamoto, Kenichi Yatsugi, Yoshinori Katayama, Kenjiro Fukuda, Daisuke Kumaki, Shizuo Tokito
  • Publication number: 20180354031
    Abstract: A method for producing a silver nanoparticle dispersion according to the present invention includes the steps of mixing an amine compound, a resin, and a silver salt to yield a complex compound; and heating and decomposing the complex compound to form silver nanoparticles. A silver nanoparticle ink can be obtained by adding an organic solvent to the silver nanoparticle dispersion obtained by this method. The resin includes, for example, a polymer exhibiting viscosity at a temperature within the range of 20° C. to 50° C. or a high molecular weight compound exhibiting viscosity at a temperature within the range of 20° C. to 50° C.
    Type: Application
    Filed: May 20, 2016
    Publication date: December 13, 2018
    Inventors: Konami IZUMI, Daisuke KUMAKI, Shizuo TOKITO, Daisuke SHIOKAWA
  • Patent number: 10144066
    Abstract: A method for producing silver nanoparticles according to the present invention includes the steps of: mixing an amine mixture and a silver compound to yield a complex compound; and heating and decomposing the complex compound to form silver nanoparticles. The amine mixture contains: a primary amine (A) having 8 or more carbon atoms and a melting point of 20° C. or lower; a diamine (B) having a primary amino group, a tertiary amino group, 4 or more carbon atoms, and a melting point of 20° C. or lower; and a cis-unsaturated primary amine (C) having 12 or more carbon atoms and a melting point of 30° C. or lower.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: December 4, 2018
    Assignee: NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY
    Inventors: Daisuke Kumaki, Shizuo Tokito
  • Publication number: 20180277789
    Abstract: It is an object of the present invention to provide a light-emitting element having a layer containing a light-emitting material and a transparent conductive film between a pair of electrodes, in which electric erosion of the transparent conductive film and metal can be prevented, and also to provide a light-emitting device using the light-emitting element. According to one feature of the invention, a light-emitting element includes a first layer 102 containing a light-emitting material, a second layer 103 containing a material having a donor level, a third layer 104 including a transparent conductive film, and a fourth layer 105 containing a hole-transporting medium between a first electrode 101 and a second electrode 106, in which the first layer 102, the second layer 103, the third layer 104, the fourth layer 105, and the second electrode 106 are provided sequentially, in which the second electrode 106 has a layer containing metal.
    Type: Application
    Filed: May 29, 2018
    Publication date: September 27, 2018
    Applicant: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kumaki, Satoshi Seo
  • Publication number: 20180219160
    Abstract: An object of the present invention is to provide a benzobis(thiadiazole) derivative, which has an excellent mobility of electron (field-effect mobility) and also has an excellent stability in the atmosphere. The present invention relates to a benzobis(thiadiazole) derivative or the like, which has cyclic imide structures annelated to an aromatic ring in the molecule, represented by the following general formula (1) or (2) wherein R, A and Z represent predetermined groups.
    Type: Application
    Filed: August 10, 2015
    Publication date: August 2, 2018
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Shizuo TOKITO, Daisuke KUMAKI, Masashi MAMADA, Takashi HONMA, Yasuhiro TANAKA, Toshikazu MACHIDA, Kazuaki KAKITA, Natsuko YAMADA
  • Patent number: 9978954
    Abstract: A benzobis(thiadiazole) derivative represented by the following general formula (1): in which R1 represents a linear or branched alkyl group, or any one of the groups of the following formula (2): in which R represents a linear or branched alkyl group; R2 represents a hydrogen atom; and R3 represents a hydrogen atom, a linear or branched alkyl group, or any one of the groups of the formula (2); with the proviso that at least one of R1 and R3 represents any one of the groups of the formula (2); and two R1 groups, two R2 groups, and two R3 groups may be the same as, or different from each other.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: May 22, 2018
    Assignee: UBE INDUSTRIES, LTD.
    Inventors: Shizuo Tokito, Daisuke Kumaki, Masashi Mamada, Kenjiro Fukuda, Yasuhiro Tanaka, Hidetaka Shima, Yasuhiro Yoneda, Harunori Fujita, Kazuaki Kakita, Youji Omata, Natsuko Yamada, Takashi Honma, Toshikazu Machida
  • Patent number: 9832886
    Abstract: A method for forming a wiring according to the present invention includes: applying an ink (6) that exhibits electrical conductivity upon light absorption to a contact hole formation portion of an upper face of an insulating resin layer (3) formed on a lower wiring element (2); and irradiating the ink (6) with light to render the ink (6) conductive and also to remove a part of the insulating resin layer (3) by heat emitted from the ink (6) so as to form a contact hole (5), the part of the insulating resin layer (3) lying under the portion of the face to which the ink (6) is applied. A step of forming an upper wiring element (4) on the upper face of the insulating resin layer (3) may further be carried out, the upper wiring element (4) being electrically continuous with the lower wiring element (2) through the contact hole (5).
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: November 28, 2017
    Assignee: NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY
    Inventors: Daisuke Kumaki, Shizuo Tokito, Yu Kobayashi, Shohei Norita
  • Patent number: 9773989
    Abstract: The metal thin film production method of the present invention includes, in the following order, the steps of: preparing a substrate (1) having thereon an underlayer (2) formed of an insulating resin; subjecting a surface of the underlayer (2) to a physical surface treatment for breaking bonds of organic molecules constituting the insulating resin; subjecting the substrate (1) to a heat treatment at a temperature of 200° C. or lower; applying a metal nanoparticle ink to the underlayer (2); and sintering metal nanoparticles contained in the metal nanoparticle ink at a temperature equal to or higher than a glass transition temperature of the underlayer (2). A fused layer (4) having a thickness of 100 nm or less is formed between the underlayer (2) and a metal thin film (3) formed by sintering the metal nanoparticles.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: September 26, 2017
    Assignee: NATIONAL UNIVERSITY CORPORATION YAMAGATA UNIVERSITY
    Inventors: Daisuke Kumaki, Tomohito Sekine, Shizuo Tokito, Kenjiro Fukuda
  • Publication number: 20170133623
    Abstract: In the present invention, a light-emitting element operating at low driving voltage, consuming low power, emitting light with good color purity and manufactured in high yields can be obtained. A light-emitting element is disclosed with a configuration composed of a fist layer containing a light-emitting material, a second layer, a third layer are formed sequentially over an anode to be interposed between the anode and a cathode in such a way that the third layer is formed to be in contact with the cathode. The second layer is made from n-type semiconductor, a mixture including that, or a mixture of an organic compound having a carrier transporting property and a material having a high electron donor property. The third layer is made from p-type semiconductor, a mixture including that, or a mixture of an organic compound having a carrier transporting property and a material having a high electron acceptor property.
    Type: Application
    Filed: January 24, 2017
    Publication date: May 11, 2017
    Inventors: Daisuke KUMAKI, Satoshi SEO
  • Patent number: 9570697
    Abstract: In the present invention, a light-emitting element operating at low driving voltage, consuming low power, emitting light with good color purity and manufactured in high yields can be obtained. A light-emitting element is disclosed with a configuration composed of a first layer containing a light-emitting material, a second layer, a third layer are formed sequentially over an anode to be interposed between the anode and a cathode in such a way that the third layer is formed to be in contact with the cathode. The second layer is made from n-type semiconductor, a mixture including that, or a mixture of an organic compound having a carrier transporting property and a material having a high electron donor property. The third layer is made from p-type semiconductor, a mixture including that, or a mixture of an organic compound having a carrier transporting property and a material having a high electron acceptor property.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: February 14, 2017
    Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
    Inventors: Daisuke Kumaki, Satoshi Seo
  • Publication number: 20170020006
    Abstract: A method for forming a wiring according to the present invention includes: applying an ink (6) that exhibits electrical conductivity upon light absorption to a contact hole formation portion of an upper face of an insulating resin layer (3) formed on a lower wiring element (2); and irradiating the ink (6) with light to render the ink (6) conductive and also to remove a part of the insulating resin layer (3) by heat emitted from the ink (6) so as to form a contact hole (5), the part of the insulating resin layer (3) lying under the portion of the face to which the ink (6) is applied. A step of forming an upper wiring element (4) on the upper face of the insulating resin layer (3) may further be carried out, the upper wiring element (4) being electrically continuous with the lower wiring element (2) through the contact hole (5).
    Type: Application
    Filed: March 5, 2015
    Publication date: January 19, 2017
    Inventors: Daisuke KUMAKI, Shizuo TOKITO, Yu KOBAYASHI, Shohei NORITA
  • Publication number: 20160372693
    Abstract: The metal thin film production method of the present invention includes, in the following order, the steps of: preparing a substrate (1) having thereon an underlayer (2) formed of an insulating resin; subjecting a surface of the underlayer (2) to a physical surface treatment for breaking bonds of organic molecules constituting the insulating resin; subjecting the substrate (1) to a heat treatment at a temperature of 200° C. or lower; applying a metal nanoparticle ink to the underlayer (2); and sintering metal nanoparticles contained in the metal nanoparticle ink at a temperature equal to or higher than a glass transition temperature of the underlayer (2). A fused layer (4) having a thickness of 100 nm or less is formed between the underlayer (2) and a metal thin film (3) formed by sintering the metal nanoparticles.
    Type: Application
    Filed: September 11, 2014
    Publication date: December 22, 2016
    Inventors: Daisuke Kumaki, Tomohito Sekine, Shizuo Tokito, Kenjiro Fukuda
  • Patent number: 9520532
    Abstract: An object of the present invention is to provide a light emitting element having slight increase in driving voltage with accumulation of light emitting time. Another object of the invention is to provide a light emitting element having slight increase in resistance value with increase in film thickness. A light emitting element of the invention includes a first layer for generating holes, a second layer for generating electrons and a third layer comprising a light emitting substance between first and second electrodes. The first and third layers are in contact with the first and second electrodes, respectively. The second and third layers are connected to each other so as to inject electrons generated in the second layer into the third layer when applying the voltage to the light emitting element such that a potential of the second electrode is higher than that of the first electrode.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: December 13, 2016
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Daisuke Kumaki, Satoshi Seo