Patents by Inventor Kensaku Asakura

Kensaku Asakura 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: 9780559
    Abstract: The present invention relates to an electrostatic discharge protection device provided with an insulating laminate containing a first and a second insulating substrate stacked there, a first and a second discharge electrode disposed inside the insulating laminate, a first insulating layer having glass disposed on the side surfaces of the first and the second discharge electrodes, a second insulating layer having glass disposed on the main surfaces of the first and the second discharge electrodes, and an discharge inducing section disposed between the side surfaces of the first and the second discharge electrode, wherein, the distance between the side surfaces of the first and the second discharge electrodes was set as ?G and the thickness of the second insulating layer was set as ?Z which two adapt to inequations 3 ?m??Z?35 ?m and ?G?40 ?m.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: October 3, 2017
    Assignee: TDK CORPORATION
    Inventors: Shingo Suzuki, Kensaku Asakura, Takahiro Fujimori, Kiyoshi Hatanaka
  • Patent number: 9497837
    Abstract: An electrostatic protection device with an improved durability with repeated use and an excellent discharging property is provided. The electrostatic protection device 100 comprising an insulating laminate 11, a pair of discharge electrodes 12 and 13 inside the insulating laminate 11 and a discharge triggered part 14 disposed between these discharge electrodes and at the periphery of the end portion of the discharge electrode is configured by disposing glass-containing insulating layers 15 and 16 on the surfaces of the discharge electrodes. The flow of conductive inorganic materials in the discharge electrodes towards the discharge triggered part caused by the discharging process can be inhibited by arranging the insulating layer containing glass on the surfaces of the discharge electrodes.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: November 15, 2016
    Assignee: TDK CORPORATION
    Inventors: Takahiro Fujimori, Shingo Suzuki, Kensaku Asakura
  • Patent number: 9380687
    Abstract: An ESD protection device is provided which has a low electrostatic capacitance, a low short-circuiting rate and an excellent durability. Also, in the ESD protection device, the damage derived from short-circuiting or the peak voltage can be inhibited. The ESD protection device includes an insulating substrate, electrodes separately and oppositely disposed on the insulating substrate and a discharge inducing section arranged between the electrodes. The discharge inducing section consists of porous structure with microscopic voids discontinuously dispersed therein and has a hollow structure in which at least one hollow space is contained. Further, the plane where the hollow structure is formed has a dense structure.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: June 28, 2016
    Assignee: TDK CORPORATION
    Inventors: Kensaku Asakura, Shingo Suzuki, Takahiro Fujimori
  • Publication number: 20160028227
    Abstract: The present invention relates to an electrostatic discharge protection device provided with an insulating laminate containing a first and a second insulating substrate stacked there, a first and a second discharge electrode disposed inside the insulating laminate, a first insulating layer having glass disposed on the side surfaces of the first and the second discharge electrodes, a second insulating layer having glass disposed on the main surfaces of the first and the second discharge electrodes, and an discharge inducing section disposed between the side surfaces of the first and the second discharge electrode, wherein, the distance between the side surfaces of the first and the second discharge electrodes was set as ?G and the thickness of the second insulating layer was set as ?Z which two adapt to inequations 3 ?m??Z?35 ?m and ?G?40 ?m.
    Type: Application
    Filed: March 6, 2014
    Publication date: January 28, 2016
    Inventors: Shingo SUZUKI, Kensaku ASAKURA, Takahiro FUJIMORI, Kiyoshi HATANAKA
  • Patent number: 9036317
    Abstract: To provide an antistatic device having a low capacitance, good discharge characteristics, and small variations in the discharge characteristics. In a so-called gap-type antistatic device in which a space between a pair of opposing electrodes is filled with an electrostatic protection material, a discharge inducing portion has protrusions protruding from interfaces between the opposing electrodes and the insulation substrates toward the insulation substrates and has a shape protruding on both sides of the insulation substrates. The relationship among the gap distance between the electrodes, the thicknesses of the opposing electrodes, and the protrusions of the discharge inducing portion is controlled under specific conditions.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: May 19, 2015
    Assignee: TDK CORPORATION
    Inventors: Shingo Suzuki, Junichi Nakamura, Kensaku Asakura, Takahiro Fujimori
  • Patent number: 8934205
    Abstract: The present invention provides an ESD protection device that not only has small electrostatic capacitance and an excellent discharge property but also has high durability against repeated use with the occurrence of short-circuiting between electrodes after discharge inhibited. An ESD protection device including an insulating substrate, electrodes arranged on this insulating substrate away from and opposite each other, and a discharge induction section located between these electrodes, wherein the discharge induction section is composed of a porous body, in which micropores are discontinuously scattered, and has a hollow structure having at least one or more hollow sections.
    Type: Grant
    Filed: September 27, 2011
    Date of Patent: January 13, 2015
    Assignee: TDK Corporation
    Inventors: Kensaku Asakura, Shingo Suzuki, Yasuhiro Hirobe
  • Publication number: 20140368963
    Abstract: An ESD countermeasure device is provided with (i) discharge electrodes that are positioned between first and second insulating substrates and are opposite to each other with a gap therebetween; and (ii) a discharge inducing portion that is disposed at opposing portions of the discharge electrodes and between the opposing portions, wherein a cross-sectional area of each of the opposing portions of the discharge electrodes that are opposite to each other is larger than that of each of lead portions of the discharge electrodes that are opposite to each other.
    Type: Application
    Filed: January 22, 2013
    Publication date: December 18, 2014
    Applicant: TDK Corporation
    Inventors: Shingo Suzuki, Kensaku Asakura, Takahiro Fujimori
  • Publication number: 20140347779
    Abstract: An ESD protection device is provided which has a low electrostatic capacitance, a low short-circuiting rate and an excellent durability. Also, in the ESD protection device, the damage derived from short-circuiting or the peak voltage can be inhibited. The ESD protection device includes an insulating substrate, electrodes separately and oppositely disposed on the insulating substrate and a discharge inducing section arranged between the electrodes. The discharge inducing section consists of porous structure with microscopic voids discontinuously dispersed therein and has a hollow structure in which at least one hollow space is contained. Further, the plane where the hollow structure is formed has a dense structure.
    Type: Application
    Filed: September 13, 2012
    Publication date: November 27, 2014
    Applicant: TDK CORPORATION
    Inventors: Kensaku Asakura, Shingo Suzuki, Takahiro Fujimori
  • Publication number: 20140313633
    Abstract: An electrostatic protection device with an improved durability with repeated use and an excellent discharging property is provided. The electrostatic protection device 100 comprising an insulating laminate 11, a pair of discharge electrodes 12 and 13 inside the insulating laminate 11 and a discharge triggered part 14 disposed between these discharge electrodes and at the periphery of the end portion of the discharge electrode is configured by disposing glass-containing insulating layers 15 and 16 on the surfaces of the discharge electrodes. The flow of conductive inorganic materials in the discharge electrodes towards the discharge triggered part caused by the discharging process can be inhibited by arranging the insulating layer containing glass on the surfaces of the discharge electrodes.
    Type: Application
    Filed: September 13, 2012
    Publication date: October 23, 2014
    Applicant: TDK CORPORATION
    Inventors: Takahiro Fujimori, Shingo Suzuki, Kensaku Asakura
  • Publication number: 20140022687
    Abstract: To provide an antistatic device having a low capacitance, good discharge characteristics, and small variations in the discharge characteristics. In a so-called gap-type antistatic device in which a space between a pair of opposing electrodes is filled with an electrostatic protection material, a discharge inducing portion has protrusions protruding from interfaces between the opposing electrodes and the insulation substrates toward the insulation substrates and has a shape protruding on both sides of the insulation substrates. The relationship among the gap distance between the electrodes, the thicknesses of the opposing electrodes, and the protrusions of the discharge inducing portion is controlled under specific conditions.
    Type: Application
    Filed: August 21, 2012
    Publication date: January 23, 2014
    Applicant: TDK CORPORATION
    Inventors: Shingo Suzuki, Junichi Nakamura, Kensaku Asakura, Takahiro Fujimori
  • Patent number: 8514539
    Abstract: The present invention is provided with a composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein the inductor element includes insulation layers made of a resin, and spiral conductors formed on the insulation layers, the ESD protection element includes a base insulation layer, a pair of gap electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the gap electrodes, and a gap protection layer provided on at least one of the upper side and lower side of the gap, the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material. The gap protection layer is made of resin including magnetic powder and carbon.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: August 20, 2013
    Assignee: TDK Corporation
    Inventors: Masao Asakawa, Tomokazu Ito, Makoto Morita, Atsushi Hitomi, Yasuhiro Hirobe, Kensaku Asakura
  • Publication number: 20130141826
    Abstract: The present invention provides an ESD protection device that not only has small electrostatic capacitance and an excellent discharge property but also has high durability against repeated use with the occurrence of short-circuiting between electrodes after discharge inhibited. An ESD protection device including an insulating substrate, electrodes arranged on this insulating substrate away from and opposite each other, and a discharge induction section located between these electrodes, wherein the discharge induction section is composed of a porous body, in which micropores are discontinuously scattered, and has a hollow structure having at least one or more hollow sections.
    Type: Application
    Filed: September 27, 2011
    Publication date: June 6, 2013
    Applicant: TDK CORPORATION
    Inventors: Kensaku Asakura, Shingo Suzuki, Yasuhiro Hirobe
  • Patent number: 8422190
    Abstract: The present invention is provided with a composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein the inductor element includes insulation layers made of a resin, and conductor patterns formed on the insulation layers, the ESD protection element includes a base insulation layer, a pair of electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the electrodes, and the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: April 16, 2013
    Assignee: TDK Corporation
    Inventors: Tomokazu Ito, Yasuhiro Hirobe, Atsushi Hitomi, Yuji Terada, Kensaku Asakura, Takeshi Urano
  • Patent number: 8422188
    Abstract: An ESD protection device that has low capacitance, excellent discharge characteristics, and improved heat resistance and weather resistance is provided. A functional layer 31, which is a composite having a conductive inorganic material 33 discretely dispersed in a matrix of an insulating inorganic material 32, is disposed between electrodes 21 and 22 disposed on an insulating substrate 11 and facing but spaced apart from each other.
    Type: Grant
    Filed: July 22, 2009
    Date of Patent: April 16, 2013
    Assignee: TDK Corporation
    Inventors: Yasuhiro Hirobe, Kensaku Asakura, Atsushi Hitomi, Takeshi Urano
  • Patent number: 8373954
    Abstract: A composite electronic device includes first and second magnetic substrates, and a functional layer sandwiched between these magnetic substrates, and the functional layer is configured by a common-mode filter layer and a ESD protection element layer. An electrostatic capacitance of the ESD protection elements is equal to or lower than 0.35 pF. The common-mode filter layer includes a first spiral conductor formed on an insulation layer, and a second spiral conductor formed on an insulation layer. DC resistance of a common mode filter is equal to or higher than 0.5? and equal to or lower than 5?, and an electrostatic capacitance of the ESD protection elements is equal to or lower than 0.35 pF. A width W and a length L of the first and second spiral conductors satisfy a relational equation expressed by ?(L/W)<(7.6651?fc)/0.1385.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: February 12, 2013
    Assignee: TDK Corporation
    Inventors: Tomokazu Ito, Yasuhiro Hirobe, Atsushi Hitomi, Yuji Terada, Kensaku Asakura, Takeshi Urano
  • Patent number: 8320093
    Abstract: The present invention is provided with a composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein the inductor element includes insulation layers made of a resin, and spiral conductors formed on the insulation layers, the ESD protection element includes a base insulation layer, a pair of gap electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the gap electrodes, and the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material. The gap of the ESD protection element is provided at exterior of the spiral conductor so as not to be overlapped with the spiral conductor in view of a laminating direction.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: November 27, 2012
    Assignee: TDK Corporation
    Inventors: Masao Asakawa, Tomokazu Ito, Sho Nakagomi, Atsushi Hitomi, Yasuhiro Hirobe, Kensaku Asakura
  • Patent number: 8243406
    Abstract: The present invention provides an ESD protection device and the like having improved durability against repeated use. An ESD protection device includes a base having an insulating surface, electrodes disposed on the insulating surface and facing but spaced apart from each other, and a functional layer disposed on at least between the electrodes. The electrodes have a multistage structure in which a gap between the electrodes is narrower toward the base.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: August 14, 2012
    Assignee: TDK Corporation
    Inventors: Kensaku Asakura, Yasuhiro Hirobe, Atsushi Hitomi, Takeshi Urano
  • Patent number: 8199451
    Abstract: An object of the present invention is to provide an ESD protection device and the like which offer a reduced discharge starting voltage and improved durability against repeated use. The present invention provides an ESD protection device including a base 2 having an insulating surface 2a, electrodes 3a and 3b disposed on the insulating surface 2a and facing but spaced apart from each other, and a functional layer 4 disposed on at least between the electrodes 3a and 3b, wherein the gap distance ?G between the electrodes 3a and 3b ranges from 0.5 ?m to 10 ?m, and the thickness ?T of each of the electrodes 3a and 3b meets a relationship of ?G/?T=1 to 30.
    Type: Grant
    Filed: December 14, 2009
    Date of Patent: June 12, 2012
    Assignee: TDK Corporation
    Inventors: Kensaku Asakura, Yasuhiro Hirobe, Atsushi Hitomi, Takeshi Urano
  • Publication number: 20110007439
    Abstract: The present invention is provided with a composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein the inductor element includes insulation layers made of a resin, and spiral conductors formed on the insulation layers, the ESD protection element includes a base insulation layer, a pair of gap electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the gap electrodes, and a gap protection layer provided on at least one of the upper side and lower side of the gap, the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material. The gap protection layer is made of resin including magnetic powder and carbon.
    Type: Application
    Filed: July 8, 2010
    Publication date: January 13, 2011
    Inventors: Masao ASAKAWA, Tomokazu Ito, Makoto Morita, Atsushi Hitomi, Yasuhiro Hirobe, Kensaku Asakura
  • Publication number: 20110007438
    Abstract: The present invention is provided with a composite electronic device comprising an inductor element and an ESD protection element formed between two magnetic substrates, wherein the inductor element includes insulation layers made of a resin, and conductor patterns formed on the insulation layers, the ESD protection element includes a base insulation layer, a pair of electrodes arranged via gap formed therebetween on the base insulation layer, and an ESD absorbing layer arranged at least between the electrodes, and the ESD absorbing layer includes a composite material having an insulation inorganic material and a conductive inorganic material discontinuously dispersed in a matrix of the insulation inorganic material.
    Type: Application
    Filed: September 29, 2009
    Publication date: January 13, 2011
    Applicant: TDK Corporation
    Inventors: Tomokazu ITO, Yasuhiro Hirobe, Atsushi Hitomi, Yuji Terada, Kensaku Asakura, Takeshi Urano