Patents by Inventor Michiaki Yajima

Michiaki Yajima 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: 20210183734
    Abstract: A method of manufacturing a semiconductor device includes adhering together a heat dissipating body and a plurality of heat generating bodies via a thermally conductive sheet, by applying pressure to the heat dissipating body and the plurality of heat generating bodies in a thickness direction of the thermally conductive sheet with the thermally conductive sheet disposed therebetween, the thermally conductive sheet having a compression modulus of 1.40 MPa or less under a compressive stress of 0.10 MPa at 150° C.
    Type: Application
    Filed: August 23, 2018
    Publication date: June 17, 2021
    Inventors: Mika KOBUNE, Michiaki YAJIMA
  • Publication number: 20210183733
    Abstract: A method of manufacturing a semiconductor device includes: adhering together a heat generating body and a heat dissipating body via a thermally conductive sheet by applying a pressure on the heat generating body and the heat dissipating body in a thickness direction of the thermally conductive sheet with the thermally conductive sheet disposed therebetween, the thermally conductive sheet having a compression modulus of 1.40 MPa or less under a compressive stress of 0.10 MPa at 150° C., and a tack strength of 5.0 N·mm or more at 25° C.
    Type: Application
    Filed: August 23, 2018
    Publication date: June 17, 2021
    Inventors: Mika KOBUNE, Michiaki YAJIMA
  • Publication number: 20200402886
    Abstract: Provided is a thermal conduction sheet, including graphite particles (A) of at least one kind selected from the group consisting of flake-shaped particles, ellipsoidal particles, and rod-shaped particles, in which: when the graphite particles (A) are flake-shaped particles, a planar direction of the graphite particles (A) is oriented in a thickness direction of the thermal conduction sheet, when the graphite particles (A) are ellipsoidal particles, a major axis direction of the graphite particles (A) is oriented in the thickness direction of the thermal conduction sheet, when the graphite particles (A) are rod-like particles, a longitudinal direction of the graphite particles (A) is oriented in the thickness direction of the thermal conduction sheet, the thermal conduction sheet has an elastic modulus of 1.4 MPa or less under a compression stress of 0.1 MPa at 150° C., and the thermal conduction sheet has a tack strength of 5.0 N·mm or higher at 25° C.
    Type: Application
    Filed: February 16, 2018
    Publication date: December 24, 2020
    Inventors: Mika KOBUNE, Michiaki YAJIMA
  • Publication number: 20200247963
    Abstract: A heat conduction sheet, includes at least one kind of graphite particle (A) selected from the group consisting of scale-like particles, ellipsoidal particles and rod-like particles; a polymer (B) having an isobutylene structure; an ethylene-propylene copolymer (C); and an ethylene octene elastomer (D), in which, in a case of scale-like particles, a plane direction of the particle is oriented in a thickness direction of the heat conduction sheet, and in a case of ellipsoidal particles or rod-like particles, a long axis direction of the particle is oriented in the thickness direction of the heat conduction sheet.
    Type: Application
    Filed: December 28, 2016
    Publication date: August 6, 2020
    Inventors: Akihiro ITO, Michiaki YAJIMA, Mika KOBUNE, Takahiro IKABATA
  • Patent number: 10125237
    Abstract: A heat radiation sheet having high heat-radiation property and excellent handleability and having sheet properties permitting the sheet to cope with changes in use temperature thereof. Also provided is a heat radiation device using the sheet. The heat radiation sheet comprises: a binder component comprising: (A) a thermoplastic rubber component; (B) a thermosetting rubber component; and (C) a thermosetting rubber curing agent crosslinkable with the thermosetting rubber component (B); and an anisotropic graphite powder oriented into a specified direction in the binder component.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: November 13, 2018
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Noriji Tashiro, Michiaki Yajima, Tomonori Seki, Atsushi Fujita, Tooru Yoshikawa, Rei Yamamoto
  • Patent number: 9574833
    Abstract: The thermal conductive sheet of the present invention includes a base sheet and, on one surface of the base sheet, a metal foil (C) that has a thickness of from 1 to 30% of a thickness of the base sheet. The base sheet includes a binder component (A) that exhibits elasticity at room temperature and a graphite powder (B) that has anisotropy, and the graphite powder (B) is oriented in a thickness direction.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: February 21, 2017
    Assignee: HITACHI CHEMICAL COMPANY, LTD.
    Inventors: Michiaki Yajima, Rei Yamamoto, Tooru Yoshikawa, Tomonori Seki
  • Publication number: 20140293626
    Abstract: A thermally conductive sheet includes a composition containing graphite particles (A) in the form of a scale, an elliptic sphere or a rod, a 6-membered ring plane in a crystal thereof being oriented in the plane direction of the scale, the major axis direction of the elliptic sphere, or the major axis direction of the rod, and an organic polymeric compound (B) having a Tg of 50° C. or lower. The plane direction of the scale, the major axis direction of the elliptic sphere, or the major axis direction of the rod of the graphite particles (A) is oriented in the thickness direction of the thermally conductive sheet, the area of the graphite particles (A) exposed onto surfaces of the thermally conductive sheet is 25% or more and 80% or less, and the Ascar C hardness of the sheet is 60 or less at 70° C.
    Type: Application
    Filed: June 13, 2014
    Publication date: October 2, 2014
    Inventors: Tooru Yoshikawa, Michiaki Yajima, Teiichi Inada
  • Publication number: 20130112389
    Abstract: The thermal conductive sheet of the present invention includes a base sheet and, on one surface of the base sheet, a metal foil (C) that has a thickness of from 1 to 30% of a thickness of the base sheet. The base sheet includes a binder component (A) that exhibits elasticity at room temperature and a graphite powder (B) that has anisotropy, and the graphite powder (B) is oriented in a thickness direction.
    Type: Application
    Filed: April 25, 2011
    Publication date: May 9, 2013
    Inventors: Michiaki Yajima, Rei Yamamoto, Tooru Yoshikawa, Tomonori Seki
  • Publication number: 20110061852
    Abstract: A heat radiation sheet having high heat-radiation property and excellent handleability and having sheet properties permitting the sheet to cope with changes in use temperature thereof. Also provided is a heat radiation device using the sheet. The heat radiation sheet comprises: a binder component comprising: (A) a thermoplastic rubber component; (B) a thermosetting rubber component; and (C) a thermosetting rubber curing agent crosslinkable with the thermosetting rubber component (B); and an anisotropic graphite powder oriented into a specified direction in the binder component.
    Type: Application
    Filed: May 22, 2009
    Publication date: March 17, 2011
    Inventors: Noriji Tashiro, Michiaki Yajima, Tomonori Seki, Atsushi Fujita, Tooru Yoshika wa, Rei Yamamoto
  • Publication number: 20100186806
    Abstract: A solar cell has a non-light-receiving side and a light-receiving side that faces a backside of an optically-transparent cover plate. A heatsink has a backside that faces the non-light-receiving side of the solar cell. The heatsink is formed of a graphite-containing material having a concave and convex texture as a radiating fin.
    Type: Application
    Filed: January 26, 2009
    Publication date: July 29, 2010
    Applicant: Mitsubishi Electric Corporation
    Inventors: Hiroaki Morikawa, Naoki Ito, Kaoru Okaniwa, Michiaki Yajima, Takayuki Suzuki
  • Publication number: 20100073882
    Abstract: A thermally conductive sheet having both of a high thermal conductivity and a high flexibility is obtained by providing a thermally conductive sheet including a composition containing: graphite particles (A) in the form of a scale, an elliptic sphere or a rod, a 6-membered ring plane in a crystal thereof being oriented in the plane direction of the scale, the major axis direction of the elliptic sphere, or the major axis direction of the rod; and an organic polymeric compound (B) having a Tg of 50° C. or lower, wherein the plane direction of the scale, the major axis direction of the elliptic sphere, or the major axis direction of the rod of the graphite particles (A) is oriented in the thickness direction of the thermally conductive sheet, the area of the graphite particles (A) exposed onto surfaces of the thermally conductive sheet is 25% or more and 80% or less, and the Ascar C hardness of the sheet is 60 or less at 70° C.
    Type: Application
    Filed: October 29, 2007
    Publication date: March 25, 2010
    Inventors: Tooru Yoshikawa, Michiaki Yajima, Teiichi Inada