Patents by Inventor Tetsuhiro Kodani

Tetsuhiro Kodani 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: 20200303619
    Abstract: The present invention addresses the problem of providing a bimorph-type piezoelectric film that is less susceptible to the influence of pyroelectric noise resulting from temperature changes, and that makes it possible to provide a pressure-sensitive sensor or the like. The present invention provides a bimorph-type piezoelectric film comprising a first pyroelectric film having piezoelectric anisotropy in an in-plane direction, and a second pyroelectric film having piezoelectric anisotropy in an in-plane direction, the first pyroelectric film and the second pyroelectric film being disposed in such a manner that their surfaces on which electric charges of the same polarity are generated by a temperature increase are each outward-facing.
    Type: Application
    Filed: March 28, 2017
    Publication date: September 24, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Tetsuhiro KODANI, Saori SAKAMI, Hiroyuki SAGAMI, Takaya YAMADA, Shinya BITOU, Eri MUKAI, Takashi KANEMURA
  • Patent number: 10745531
    Abstract: The present invention provides a film having excellent heat resistance and a small difference between the permittivity at low temperatures and the permittivity at high temperatures. The present invention provides a film having a relative permittivity of 8 or more at a frequency of 1 kHz at 30° C., wherein the rate of change is ?8 to +8% as calculated from a relative permittivity A at a frequency of 1 kHz at 30° C. and a relative permittivity B at a frequency of 1 kHz at 150° C. according to the following formula: Rate of change(%)=(B?A)/A×100.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: August 18, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Takashi Kanemura, Eri Mukai, Takeshi Hazama, Tetsuhiro Kodani, Nobuyuki Komatsu, Hisako Nakamura, Kouji Yokotani, Mayuko Tatemichi, Akio Higaki
  • Publication number: 20200220066
    Abstract: The present invention relates to a pressure signal detection circuit and a pressure signal detection method in which a pyroelectric signal from a piezoelectric film is suppressed. More specifically, the pressure signal detection circuit receives input of an input signal from a piezoelectric film, differentiates the input signal for signal component analysis of the input signal, outputs the signal analysis value of the input signal based on the differential value, removes offset of the input signal by using the signal component analysis value, integrates the input signal, and outputs a pressure input signal value from which a heat input signal value is removed. With this structure, the present invention reduces the influence on the thermal reaction as compared with prior art, while enabling pressure signal detection at a higher speed.
    Type: Application
    Filed: June 26, 2018
    Publication date: July 9, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hyunsik KIM, Takashi KANEMURA, Tetsuhiro KODANI, Kwan-Young HAN
  • Publication number: 20200144481
    Abstract: An object of the present invention is to provide a vibration sensor in which the frequency dependence of the output is small. The present invention provides a vibration sensor 1 comprising: a support 2; an organic piezoelectric material 3 deformably disposed in or on the support 2; and an electrode 4 for extracting an electrical signal generated by deformation of the organic piezoelectric material 3, the electrode 4 being formed on the organic piezoelectric material 3, the organic piezoelectric material 3 comprising a copolymer of vinylidene fluoride and one or more monomers copolymerizable with vinylidene fluoride.
    Type: Application
    Filed: July 5, 2018
    Publication date: May 7, 2020
    Applicants: DAIKIN INDUSTRIES, LTD., OSAKA UNIVERSITY
    Inventors: Shinya BITOU, Tetsuhiro KODANI, Saori SAKAMI, Takashi KANEMURA, Tsuyoshi SEKITANI, Takafumi UEMURA, Shusuke YOSHIMOTO
  • Patent number: 10381546
    Abstract: An object of the present invention is to provide a bimorph piezoelectric film that enables the production of touch panels and the like that are less influenced by pyroelectric noise due to temperature change, and exhibit high transparency. The present invention provides a bimorph piezoelectric film comprising in sequence a first piezoelectric film, a tackifier layer or an adhesive agent layer, and a second piezoelectric film, the first piezoelectric film and the second piezoelectric film being disposed in such a manner that their surfaces on which electric charges of the same polarity are generated by a temperature increase are each outward-facing, the first piezoelectric film and the second piezoelectric film each having a total light transmittance of 90% or more, and a total haze value of 8.0% or less.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: August 13, 2019
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Meiten Kou, Tetsuhiro Kodani, Tomoyuki Gotou, Saori Inaba, Takashi Kanemura
  • Publication number: 20190109274
    Abstract: A piezoelectric wire of the present invention includes a conductive wire 11 and a polymer piezoelectric layer 12 that coats the conductive wire 11. The polymer piezoelectric layer 12 contains a ?-phase polyvinylidene fluoride-based copolymer, and the conductive wire 11 has a wire diameter of 1.0 mm or less. The ?-phase polyvinylidene fluoride-based copolymer is preferably at least one selected from a vinylidene fluoride-trifluoroethylene copolymer and a vinylidene fluoride-tetrafluoroethylene copolymer.
    Type: Application
    Filed: March 27, 2017
    Publication date: April 11, 2019
    Inventors: Ken OGASAHARA, Satoshi SHIMIZU, Susumu KAWATO, Takashi KANEMURA, Tetsuhiro KODANI
  • Patent number: 10108287
    Abstract: A touch panel hardly affected by pyroelectric noise due to temperature includes a first pyroelectric material and a second pyroelectric material, and is capable of detecting press pressure applied to the first pyroelectric material and/or the second pyroelectric material. The upper surface of the first pyroelectric material and the lower surface of the second pyroelectric material are surfaces on which a positive charge is generated when the temperature increases, and a negative charge is generated when the temperature decreases. The lower surface of the first pyroelectric material and the upper surface of the second pyroelectric material are surfaces on which a negative charge is generated when the temperature increases, and a positive charge is generated when the temperature decreases.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: October 23, 2018
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Tetsuhiro Kodani, Eri Mukai, Takashi Kanemura, Meiten Kou
  • Patent number: 10084292
    Abstract: An object of the present invention is to provide a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film that can significantly reduce, when used as an optical film, the deterioration of the quality of video or still images formed by display elements. The present invention provides a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film having 2,000 or fewer spot defects per m2, the number of spot defects being measured by a defect measurement method; the method using an surface inspection system in which a CCD camera is placed so as to detect defects at an angle of 45 degrees relative to an LED source, defects of the film are read within a rectangular range of 300 mm in a width direction (the direction perpendicular to the scanning direction), and 150 mm in a machine direction (the scanning direction), while the film is scanned under the camera at a rate of 20 m/min; wherein first, defects having a bright area of 1.5 mm2 or less and a dark area of 1.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: September 25, 2018
    Assignees: DAIKIN INDUSTRIES, LTD., TOHO KASEI CO., LTD.
    Inventors: Tetsuhiro Kodani, Eri Mukai, Takashi Kanemura, Meiten Kou, Susumu Kawato, Satoshi Shimizu
  • Publication number: 20180223059
    Abstract: The present invention provides a film having excellent heat resistance and a small difference between the permittivity at low temperatures and the permittivity at high temperatures. The present invention provides a film having a relative permittivity of 8 or more at a frequency of 1 kHz at 30° C., wherein the rate of change is ?8 to +8% as calculated from a relative permittivity A at a frequency of 1 kHz at 30° C. and a relative permittivity B at a frequency of 1 kHz at 150° C. according to the following formula: Rate of change (%)=(B?A)/A×100.
    Type: Application
    Filed: July 13, 2016
    Publication date: August 9, 2018
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takashi KANEMURA, Eri MUKAI, Takeshi HAZAMA, Tetsuhiro KODANI, Nobuyuki KOMATSU, Hisako NAKAMURA, Kouji YOKOTANI, Mayuko TATEMICHI, Akio HIGAKI
  • Publication number: 20180097338
    Abstract: An object of the present invention is to provide a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film that can significantly reduce, when used as an optical film, the deterioration of the quality of video or still images formed by display elements. The present invention provides a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film having 2,000 or fewer spot defects per m2, the number of spot defects being measured by a defect measurement method; the method using an surface inspection system in which a CCD camera is placed so as to detect defects at an angle of 45 degrees relative to an LED source, defects of the film are read within a rectangular range of 300 mm in a width direction (the direction perpendicular to the scanning direction), and 150 mm in a machine direction (the scanning direction), while the film is scanned under the camera at a rate of 20 m/min; wherein first, defects having a bright area of 1.5 mm2 or less and a dark area of 1.
    Type: Application
    Filed: November 30, 2017
    Publication date: April 5, 2018
    Applicants: DAIKIN INDUSTRIES, LTD., TOHO KASEI CO., LTD.
    Inventors: Tetsuhiro KODANI, Eri MUKAI, Takashi KANEMURA, Meiten KOU, Susumu KAWATO, Satoshi SHIMIZU
  • Patent number: 9865996
    Abstract: An object of the present invention is to provide a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film that can significantly reduce, when used as an optical film, the deterioration of the quality of video or still images formed by display elements. The present invention provides a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film having 2,000 or fewer spot defects per m2, the number of spot defects being measured by a defect measurement method; the method using an surface inspection system in which a CCD camera is placed so as to detect defects at an angle of 45 degrees relative to an LED source, defects of the film are read within a rectangular range of 300 mm in a width direction (the direction perpendicular to the scanning direction), and 150 mm in a machine direction (the scanning direction), while the film is scanned under the camera at a rate of 20 m/min; wherein first, defects having a bright area of 1.5 mm2 or less and a dark area of 1.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: January 9, 2018
    Assignees: DAIKIN INDUSTRIES, LTD., TOHO KASEI CO., LTD.
    Inventors: Tetsuhiro Kodani, Eri Mukai, Takashi Kanemura, Meiten Kou, Susumu Kawato, Satoshi Shimizu
  • Publication number: 20170033276
    Abstract: An object of the present invention is to provide a bimorph piezoelectric film that enables the production of touch panels and the like that are less influenced by pyroelectric noise due to temperature change, and exhibit high transparency. The present invention provides a bimorph piezoelectric film comprising in sequence a first piezoelectric film, a tackifier layer or an adhesive agent layer, and a second piezoelectric film, the first piezoelectric film and the second piezoelectric film being disposed in such a manner that their surfaces on which electric charges of the same polarity are generated by a temperature increase are each outward-facing, the first piezoelectric film and the second piezoelectric film each having a total light transmittance of 90% or more, and a total haze value of 8.0% or less.
    Type: Application
    Filed: February 26, 2015
    Publication date: February 2, 2017
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Meiten KOU, Tetsuhiro KODANI, Tomoyuki GOTOU, Saori INABA, Takashi KANEMURA
  • Publication number: 20160264742
    Abstract: A primary object of the present invention is to provide a film exhibiting high electrical insulation properties and excellent withstand voltage properties and a method for producing the film. As a means for achieving the object, the present invention provides a vinylidene fluoride-based polymer film in which the 99% voltage failure resistance value in a Weibull plot is 300 V/?m or more.
    Type: Application
    Filed: October 8, 2014
    Publication date: September 15, 2016
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Meiten KOU, Takashi KANEMURA, Eri MUKAI, Tetsuhiro KODANI
  • Publication number: 20160202823
    Abstract: A touch panel hardly affected by pyroelectric noise due to temperature includes a first pyroelectric material and a second pyroelectric material, and is capable of detecting press pressure applied to the first pyroelectric material and/or the second pyroelectric material. The upper surface of the first pyroelectric material and the lower surface of the second pyroelectric material are surfaces on which a positive charge is generated when the temperature increases, and a negative charge is generated when the temperature decreases. The lower surface of the first pyroelectric material and the upper surface of the second pyroelectric material are surfaces on which a negative charge is generated when the temperature increases, and a positive charge is generated when the temperature decreases.
    Type: Application
    Filed: October 8, 2014
    Publication date: July 14, 2016
    Inventors: Tetsuhiro KODANI, Eri MUKAI, Takashi KANEMURA, Meiten KOU
  • Publication number: 20150368413
    Abstract: The present invention aims to provide a film having a high dielectric constant and a low dissipation factor. The high dielectric film of the present invention includes a vinylidene fluoride/tetrafluoroethylene copolymer (A) with a mole ratio (vinylidene fluoride)/(tetrafluoroethylene) of 95/5 to 80/20. The film includes an ?-crystal structure and a ?-crystal structure. The ratio of the ?-crystal structure is 50% or more.
    Type: Application
    Filed: October 16, 2013
    Publication date: December 24, 2015
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Mayuko TATEMICHI, Miharu OTA, Kouji YOKOTANI, Nobuyuki KOMATSU, Hisako NAKAMURA, Fumiko SHIGENAI, Takeshi HAZAMA, Masakazu KINOSHITA, Meiten KOH, Takuji ISHIKAWA, Takashi IGUCHI, Kazunobu UCHIDA, Tomoyuki FUKATANI, Takahiro KITAHARA, Tetsuhiro KODANI
  • Publication number: 20150349500
    Abstract: An object of the present invention is to provide a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film that can significantly reduce, when used as an optical film, the deterioration of the quality of video or still images formed by display elements. The present invention provides a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film having 2,000 or fewer spot defects per m2, the number of spot defects being measured by a defect measurement method; the method using an surface inspection system in which a CCD camera is placed so as to detect defects at an angle of 45 degrees relative to an LED source, defects of the film are read within a rectangular range of 300 mm in a width direction (the direction perpendicular to the scanning direction), and 150 mm in a machine direction (the scanning direction), while the film is scanned under the camera at a rate of 20 m/min; wherein first, defects having a bright area of 1.5 mm2 or less and a dark area of 1.
    Type: Application
    Filed: December 27, 2013
    Publication date: December 3, 2015
    Inventors: Tetsuhiro KODANI, Eri MUKAI, Takashi KANEMURA, Meiten KOU, Susumu KAWATO, Satoshi SHIMIZU
  • Patent number: 9200970
    Abstract: A transparent piezoelectric sheet-with-a-frame includes a transparent piezoelectric sheet and a frame covering a peripheral edge portion of the transparent piezoelectric sheet. The transparent piezoelectric sheet includes one transparent piezoelectric film including an organic polymer, one first transparent plate electrode placed on a first main surface of the transparent piezoelectric film and having a first transparent plate electrode portion, and one second transparent plate electrode placed on a second main surface of the transparent piezoelectric film and having a second transparent plate electrode portion. An outline of the second transparent plate electrode portion is positioned inside an outline of the first transparent plate electrode portion as seen in a plan view. The outline of the first transparent plate electrode portion completely coincides with the frame, and the outline of the second transparent plate electrode portion does not at all coincide with the frame as seen in the plan view.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: December 1, 2015
    Assignees: Daikin Industries, Ltd., IDEAL STAR INC.
    Inventors: Tetsuhiro Kodani, Yuuki Kuwajima, Eri Mukai, Meiten Koh, Takashi Kanemura, Kenji Omote, Hiroji Ohigashi
  • Patent number: 9128547
    Abstract: A transparent piezoelectric sheet includes a quadrilateral-shaped transparent piezoelectric film and a first transparent plate electrode. The quadrilateral-shaped transparent piezoelectric film includes an organic polymer. The quadrilateral-shaped transparent piezoelectric film has entire main surfaces that are piezoelectric. The first transparent plate electrode is layered on part of a first main surface of the main surfaces of the transparent piezoelectric film. One to three sides of the four sides of the quadrilateral shape of the transparent piezoelectric film and area(s) of the first main surface adjacent thereto are not covered by the first transparent plate electrode.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: September 8, 2015
    Assignees: Daikin Industries, Ltd., Ideal Star Inc.
    Inventors: Tetsuhiro Kodani, Yuuki Kuwajima, Eri Mukai, Takashi Kanemura, Meiten Koh, Kenji Omote, Hiroji Ohigashi
  • Patent number: 8883947
    Abstract: A vinylidene fluoride homopolymer represented by the formula (4): CF3-(A1)-I??(4) wherein A1 represents a structural unit of vinylidene fluoride homopolymer which includes crystal form I alone or as main component and has a number average degree of polymerization of 5 to 12.
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: November 11, 2014
    Assignee: Daikin Industries, Ltd.
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Publication number: 20140016176
    Abstract: A hydrophobic dielectric film for electrowetting, which can drive a conductive liquid by using a low voltage and containing a vinylidene fluoride based polymer.
    Type: Application
    Filed: February 8, 2012
    Publication date: January 16, 2014
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Tetsuhiro Kodani, Kouji Yokotani, Nobuyuki Komatsu, Meiten Kou, Takashi Kanemura