Patents by Inventor Masafumi Kuramoto

Masafumi Kuramoto 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: 20210147695
    Abstract: There is a problem that when a silver powder sintering paste that is substantially free from resin is used, an organic solvent used as a dispersion medium bleeds, which results in contamination and wire bonding defects. In order to solve the problem, provided is a metal powder sintering paste that contains, as a principal component, silver particles having an average particle diameter (a median diameter) of 0.3 ?m to 5 ?m and further contains an anionic surfactant but is substantially free from resin.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 20, 2021
    Applicant: NICHIA CORPORATION
    Inventors: Teppei KUNIMUNE, Masafumi KURAMOTO
  • Patent number: 10978623
    Abstract: A semiconductor device includes a semiconductor element, a base body, a conductive adhesive member, and a sealing member. The semiconductor element includes a substrate, a semiconductor element structure provided on the substrate, and p-electrode and n-electrode provided on the semiconductor element structure. The semiconductor element is disposed on the base body. The conductive adhesive member electrically connects the p-electrode and the n-electrode to the base body. The sealing member is provided to cover the semiconductor element on an upper surface of the base body. The conductive adhesive member contains particles selected from a group of (i) surface-treated particles having a particle diameter of 1 nm or more and 100 ?m or less and (ii) particles that coexist with a dispersing agent.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: April 13, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Masafumi Kuramoto, Toshifumi Imura, Tomoki Tanisada
  • Patent number: 10971656
    Abstract: The present invention provides a surface mounted light emitting apparatus which has long service life and favorable property for mass production, and a molding used in the surface mounted light emitting apparatus. The surface mounted light emitting apparatus comprises the light emitting device 10 based on GaN which emits blue light, the first resin molding 40 which integrally molds the first lead 20 whereon the light emitting device 10 is mounted and the second lead 30 which is electrically connected to the light emitting device 10, and the second resin molding 50 which contains YAG fluorescent material and covers the light emitting device 10. The first resin molding 40 has the recess 40c comprising the bottom surface 40a and the side surface 40b formed therein, and the second resin molding 50 is placed in the recess 40c.
    Type: Grant
    Filed: May 13, 2020
    Date of Patent: April 6, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Masafumi Kuramoto, Tomohisa Kishimoto
  • Patent number: 10950770
    Abstract: An object of the present invention is to provide a method for producing a conductive material that allows a low electric resistance to be generated, and that is obtained by using an inexpensive and stable conductive material composition containing no adhesive. The conductive material can be provided by a producing method that includes the step of sintering a first conductive material composition that contains silver particles having an average particle diameter (median diameter) of 0.1 ?m to 15 ?m, and a metal oxide, so as to obtain a conductive material. The conductive material can be provided also by a method that includes the step of sintering a second conductive material composition that contains silver particles having an average particle diameter (median diameter) of 0.1 ?m to 15 ?m in an atmosphere of oxygen or ozone, or ambient atmosphere, at a temperature in a range of 150° C. to 320° C., so as to obtain a conductive material.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: March 16, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Masafumi Kuramoto, Satoru Ogawa, Katsuaki Suganuma, Keun-Soo Kim
  • Patent number: 10941304
    Abstract: There is a problem that when a silver powder sintering paste that is substantially free from resin is used, an organic solvent used as a dispersion medium bleeds, which results in contamination and wire bonding defects. In order to solve the problem, provided is a metal powder sintering paste that contains, as a principal component, silver particles having an average particle diameter (a median diameter) of 0.3 ?m to 5 ?m and further contains an anionic surfactant but is substantially free from resin.
    Type: Grant
    Filed: April 3, 2017
    Date of Patent: March 9, 2021
    Assignee: NICHIA CORPORATION
    Inventors: Teppei Kunimune, Masafumi Kuramoto
  • Publication number: 20210036193
    Abstract: A light-emitting device includes: a light-emitting element including a first surface provided as a light extraction surface, a second surface opposite to the first surface, a plurality of third surfaces between the first surface and the second surface, and a positive electrode and a negative electrode at the second surface; a light-transmissive member disposed at the first surface; and a bonding member disposed between the light-emitting element and the light-transmissive member and covering from the first surface to the plurality of third surfaces of the light-emitting element to bond the light-emitting element and the light-transmissive member. The bonding member is made of a resin that contains nanoparticles. The nanoparticles have a particle diameter of 1 nm or more and 30 nm or less and a content of 10 mass % or more and 20 mass % or less.
    Type: Application
    Filed: July 30, 2020
    Publication date: February 4, 2021
    Applicant: NICHIA CORPORATION
    Inventors: Toshifumi IMURA, Masafumi KURAMOTO, Hiroki INOUE
  • Publication number: 20200308405
    Abstract: A silicone resin composition includes a silicone resin and a ceria-zirconia solid solution, with the solid solution being contained in a range of 0.01 to 2 parts by mass relative to 100 parts by mass of the silicone resin.
    Type: Application
    Filed: March 27, 2020
    Publication date: October 1, 2020
    Applicant: NICHIA CORPORATION
    Inventors: Masafumi KURAMOTO, Katsuyuki TSUNANO, Takuma ARIKAWA
  • Publication number: 20200274034
    Abstract: The present invention provides a surface mounted light emitting apparatus which has long service life and favorable property for mass production, and a molding used in the surface mounted light emitting apparatus. The surface mounted light emitting apparatus comprises the light emitting device 10 based on GaN which emits blue light, the first resin molding 40 which integrally molds the first lead 20 whereon the light emitting device 10 is mounted and the second lead 30 which is electrically connected to the light emitting device 10, and the second resin molding 50 which contains YAG fluorescent material and covers the light emitting device 10. The first resin molding 40 has the recess 40c comprising the bottom surface 40a and the side surface 40b formed therein, and the second resin molding 50 is placed in the recess 40c.
    Type: Application
    Filed: May 13, 2020
    Publication date: August 27, 2020
    Applicant: NICHIA CORPORATION
    Inventors: Masafumi KURAMOTO, Tomohisa KISHIMOTO
  • Patent number: 10707388
    Abstract: A semiconductor device includes a base, a semiconductor element mounted on the base, a porous metal sintered body and a sealing member. The porous metal sintered body is provided on the base in an area different from an area on which the semiconductor element is mounted. The sealing member covers the semiconductor element. The sealing member is placed inside the porous metal sintered body.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: July 7, 2020
    Assignee: NICHIA CORPORATION
    Inventors: Teppei Kunimune, Masafumi Kuramoto
  • Publication number: 20200212272
    Abstract: A method for producing a light emitting device, including: integrally molding plural leads with a molded resin portion comprising a resin composition containing a thermosetting resin or a thermoplastic resin, so as to prepare a substrate having a concave portion having a side surface and a bottom surface; disposing a light emitting element on the bottom surface of the concave portion; forming a film including a metal oxide on the side surface of the concave portion and an upper surface of the substrate; disposing a sealing resin composition containing an addition curing silicone resin composition containing an organopolysiloxane containing a functional group capable of performing a crosslinking reaction and an aryl group in one molecule, and an organic modified silicone oil that is unreactive with the organopolysiloxane, in the concave portion; and curing the sealing resin composition to form a resin package.
    Type: Application
    Filed: December 23, 2019
    Publication date: July 2, 2020
    Applicant: NICHIA CORPORATION
    Inventors: Katsuyuki TSUNANO, Daisuke NIKI, Masafumi KURAMOTO
  • Patent number: 10686102
    Abstract: The present invention provides a surface mounted light emitting apparatus which has long service life and favorable property for mass production, and a molding used in the surface mounted light emitting apparatus. The surface mounted light emitting apparatus comprises the light emitting device 10 based on GaN which emits blue light, the first resin molding 40 which integrally molds the first lead 20 whereon the light emitting device 10 is mounted and the second lead 30 which is electrically connected to the light emitting device 10, and the second resin molding 50 which contains YAG fluorescent material and covers the light emitting device 10. The first resin molding 40 has the recess 40c comprising the bottom surface 40a and the side surface 40b formed therein, and the second resin molding 50 is placed in the recess 40c.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: June 16, 2020
    Assignee: Nichia Corporation
    Inventors: Masafumi Kuramoto, Tomohisa Kishimoto
  • Publication number: 20200111932
    Abstract: A light emitting element includes a light emitting element having a first face on which a first electrode and a second electrode are provided. A wavelength converting material covers a whole of the light emitting element except for the first face such that a surface of the wavelength converting material and the first face constitute a substantially flat plane. A first electrically conductive material is provided on the first face and the surface of the wavelength converting material to be electrically connected to the first electrode. A second electrically conductive material is provided on the first face and the surface of the wavelength converting material to be electrically connected to the second electrode. An insulating member is disposed on the first electrically conductive material, the second electrically conductive material, and the first face between the first electrode and the second electrode.
    Type: Application
    Filed: December 6, 2019
    Publication date: April 9, 2020
    Applicant: NICHIA CORPORATION
    Inventors: Masafumi KURAMOTO, Daisuke IWAKURA
  • Publication number: 20200105987
    Abstract: A light emitting device includes a light emitting element, a substrate which contains a conductive member containing silver having the light emitting element mounted, and a sealing member which covers the light emitting element, and the sealing member is made of a cured silicone composite containing the following components (A), (B), (C), and (D): (A) an organopolysiloxane containing at least two alkenyl groups each bonded to a silicon atom per one molecule; (B) an organohydrogenpolysiloxane containing at least two hydrogen atoms each bonded to a silicon atom per one molecule; (C) a hydrosilylation catalyst; and (D) a zinc silanolate represented by the following formula (1): In the formula (1), R1 to R7 each independently represent a linear, branched, or cyclic monovalent hydrocarbon group having 1 to 10 carbon atoms, which may be substituted by a fluorine atom, or each independently represent a hydroxy group or an alkoxy group; and m represents an integer of 1 or greater.
    Type: Application
    Filed: September 27, 2019
    Publication date: April 2, 2020
    Applicant: NICHIA CORPORATION
    Inventors: Hiroki INOUE, Masafumi KURAMOTO
  • Patent number: 10593851
    Abstract: Provided is a metal powder sintering paste having a high resistance to thermal stress. The present invention provides a metal powder sintering paste containing silver particles having an average particle diameter (median diameter) of 0.3 ?m to 5 ?m as a main component, further containing inorganic spacer particles having a CV value (standard deviation/average value) of less than 5%, and containing substantially no resin.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: March 17, 2020
    Assignee: NICHIA CORPORATION
    Inventors: Teppei Kunimune, Masafumi Kuramoto
  • Patent number: 10573795
    Abstract: An object of the present invention is to provide a method for producing a conductive material that allows a low electric resistance to be generated, and that is obtained by using an inexpensive and stable conductive material composition containing no adhesive. The conductive material can be provided by a producing method that includes the step of sintering a first conductive material composition that contains silver particles having an average particle diameter (median diameter) of 0.1 ?m to 15 ?m, and a metal oxide, so as to obtain a conductive material. The conductive material can be provided also by a method that includes the step of sintering a second conductive material composition that contains silver particles having an average particle diameter (median diameter) of 0.1 ?m to 15 ?m in an atmosphere of oxygen or ozone, or ambient atmosphere, at a temperature in a range of 150° C. to 320° C., so as to obtain a conductive material.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: February 25, 2020
    Assignee: NICHIA CORPORATION
    Inventors: Masafumi Kuramoto, Satoru Ogawa, Katsuaki Suganuma, Keun-Soo Kim
  • Publication number: 20200049618
    Abstract: Provided is a curable resin composition which can be cured to form a material (cured product) that has low tack properties and resists adhesion of garbage. The present invention provides a curable resin composition comprising polysiloxane (A) having not less than 2 alkenyl groups in the molecule and polysiloxane (B) having not less than 2 hydrosilyl groups in the molecule, wherein (T+Q)/D>0.3 and M+D+T+Q=1 are satisfied regarding all silicon atoms contained therein, the amount of the hydrosilyl groups with respect to 1 mol of aliphatic carbon-carbon double bonds present therein is 0.9 to 5.0 mol, and a cured product of the curable resin composition exhibits a separation strength of not more than 0.40 N per mm2 in separation load evaluation and/or a total separation load of not more than 0.018 N·mm per mm2.
    Type: Application
    Filed: October 10, 2019
    Publication date: February 13, 2020
    Applicants: DAICEL CORPORATION, NICHIA CORPORATION
    Inventors: Yasunobu NAKAGAWA, Takeshi YOSHIDA, Satoru OGAWA, Masafumi KURAMOTO, Masahide BANDO
  • Patent number: 10535794
    Abstract: A method for manufacturing a light emitting device includes placing a light emitting element on a releasable base material so that a first face of the light emitting element is in contact with the releasable base material. An entire area of the first face is a first area. A wavelength converting material is provided on the releasable base material to cover an entirety of the light emitting element. The releasable base material is removed. A first electrically conductive material covers the first electrode and the wavelength converting material. An entire area of the first electrically conductive material viewed in a height direction is a second area larger than the first area. A second electrically conductive material covers the second electrode and the wavelength converting material. An entire area of the second electrically conductive material viewed in the height direction is a third area larger than the first area.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: January 14, 2020
    Assignee: NICHIA CORPORATION
    Inventors: Masafumi Kuramoto, Daisuke Iwakura
  • Patent number: 10488325
    Abstract: Provided is a curable resin composition which can be cured to form a material (cured product) that has low tack properties and resists adhesion of garbage. The present invention provides a curable resin composition comprising polysiloxane (A) having not less than 2 alkenyl groups in the molecule and polysiloxane (B) having not less than 2 hydrosilyl groups in the molecule, wherein (T+Q)/D>0.3 and M+D+T+Q=1 are satisfied regarding all silicon atoms contained therein, the amount of the hydrosilyl groups with respect to 1 mol of aliphatic carbon-carbon double bonds present therein is 0.9 to 5.0 mol, and a cured product of the curable resin composition exhibits a separation strength of not more than 0.40 N per mm2 in separation load evaluation and/or a total separation load of not more than 0.018 N·mm per mm2.
    Type: Grant
    Filed: June 22, 2017
    Date of Patent: November 26, 2019
    Assignees: DAICEL CORPORATION, NICHIA CORPORATION
    Inventors: Yasunobu Nakagawa, Takeshi Yoshida, Satoru Ogawa, Masafumi Kuramoto, Masahide Bando
  • Publication number: 20190326493
    Abstract: An object of the present invention is to provide a method for producing a conductive material that allows a low electric resistance to be generated, and that is obtained by using an inexpensive and stable conductive material composition containing no adhesive. The conductive material can be provided by a producing method that includes the step of sintering a first conductive material composition that contains silver particles having an average particle diameter (median diameter) of 0.1 ?m to 15 ?m, and a metal oxide, so as to obtain a conductive material. The conductive material can be provided also by a method that includes the step of sintering a second conductive material composition that contains silver particles having an average particle diameter (median diameter) of 0.1 ?m to 15 ?m in an atmosphere of oxygen or ozone, or ambient atmosphere, at a temperature in a range of 150° C. to 320° C., so as to obtain a conductive material.
    Type: Application
    Filed: June 25, 2019
    Publication date: October 24, 2019
    Applicant: NICHIA CORPORATION
    Inventors: Masafumi KURAMOTO, Satoru OGAWA, Katsuaki SUGANUMA, Keun-Soo KIM
  • Publication number: 20190273188
    Abstract: The present invention provides a surface mounted light emitting apparatus which has long service life and favorable property for mass production, and a molding used in the surface mounted light emitting apparatus. The surface mounted light emitting apparatus comprises the light emitting device 10 based on GaN which emits blue light, the first resin molding 40 which integrally molds the first lead 20 whereon the light emitting device 10 is mounted and the second lead 30 which is electrically connected to the light emitting device 10, and the second resin molding 50 which contains YAG fluorescent material and covers the light emitting device 10. The first resin molding 40 has the recess 40c comprising the bottom surface 40a and the side surface 40b formed therein, and the second resin molding 50 is placed in the recess 40c.
    Type: Application
    Filed: March 18, 2019
    Publication date: September 5, 2019
    Applicant: NICHIA CORPORATION
    Inventors: Masafumi KURAMOTO, Tomohisa KISHIMOTO