Patents by Inventor Akira Hirao
Akira Hirao 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).
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Publication number: 20210184023Abstract: A semiconductor device having a semiconductor module. The semiconductor module includes first and second conductor layers facing each other, a first semiconductor element provided between the first and second conductor layers, positive and negative electrode terminals respectively provided on edge portions of the first and second conductor layers at a first side of the semiconductor module in a top view of the semiconductor module, control wiring that is electrically connected to the first control electrode, and that extends out of the first and second conductor layers at a second side of the semiconductor module that is opposite to the first side in the top view, and a control terminal that is electrically connected to the control wiring, that is positioned outside the first and second conductor layers in the top view, and that has an end portion that is aligned with the positive and negative electrode terminals.Type: ApplicationFiled: October 30, 2020Publication date: June 17, 2021Applicant: FUJI ELECTRIC CO., LTD.Inventors: Motohito HORI, Yoshinari IKEDA, Akira HIRAO, Tsunehiro NAKAJIMA
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Publication number: 20210125916Abstract: A semiconductor module, including a board that has first and second conductive plates located side by side on a first insulating plate, a first external connection terminal located on the first conductive plate, first and second semiconductor chips respectively disposed on the first and second conductive plates, and a printed-circuit board including a second insulating plate and first and second wiring boards located on a first principal plane of the second insulating plate. The first wiring board electrically connects an upper surface electrode of the first semiconductor chip and a relay area on the second conductive plate. The second wiring board is electrically connected to an upper surface electrode of the second semiconductor chip. The semiconductor module further includes a second external connection terminal electrically connected to an end portion of the second wiring board and formed on the second principal plane of the second insulating plate.Type: ApplicationFiled: October 23, 2020Publication date: April 29, 2021Applicant: FUJI ELECTRIC CO., LTD.Inventors: Akira HIRAO, Yoshinari IKEDA, Motohito HORI
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Patent number: 10961417Abstract: Provided is a laminate sheet in which a first sheet, a PSA layer and a second sheet are laminated in this order. Of the first and second sheets, at least one is a release liner having a release face on the side facing the PSA layer. The PSA layer has a thickness of 200 ?m or greater. The first sheet has a tensile modulus of 1000 MPa or greater and the second sheet has a tensile modulus of 500 MPa or less.Type: GrantFiled: January 23, 2019Date of Patent: March 30, 2021Assignee: NITTO DENKO CORPORATIONInventors: Tatsuya Suzuki, Akira Hirao, Hiroki Ieda
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Publication number: 20210002516Abstract: An object of a first embodiment of the present invention is to provide an electrical debonding type adhesive sheet which can be applied while inhibiting the trapping of air bubbles and while easily avoiding surface irregularities, etc., and which gives a joined body that can be easily debonded. The electrical debonding type adhesive sheet according to the first embodiment of the present invention includes a substrate for voltage application, a first adhesive layer, which is constituted of an electrically debondable adhesive and is formed on an electroconductive surface of the substrate for voltage application, and a second adhesive layer, which is formed on the opposite surface of the substrate for voltage application, the electrical debonding type adhesive sheet including a plurality of linked parts and a linking part which links the plurality of linked parts to each other.Type: ApplicationFiled: March 6, 2019Publication date: January 7, 2021Inventors: Kaori AKAMATSU, Kaori MIZOBATA, Ryo AWANE, Akira HIRAO, Junji YOKOYAMA
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Publication number: 20200406582Abstract: The present invention provides an electrical debonding type adhesive sheet capable of producing a joined body in which a voltage can be stably applied to an electrical debonding type adhesive layer. An electrical debonding type adhesive sheet according to a first embodiment of the present invention includes a first adhesive layer, a substrate for voltage application including an electroconductive layer and a base layer, and a second adhesive layer in this order, and has a first protrudent part, in which the first adhesive layer and the substrate for voltage application extend and protrude with respect to the second adhesive layer, and a second protrudent part, in which the substrate for voltage application extends from the first protrudent part and protrudes with respect to the first adhesive layer.Type: ApplicationFiled: March 6, 2019Publication date: December 31, 2020Inventors: Kaori AKAMATSU, Kaori MIZOBATA, Ryo AWANE, Akira HIRAO, Junji YOKOYAMA, Yosuke SHIMIZU
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Patent number: 10867980Abstract: Semiconductor equipment includes semiconductor modules sealed with a resin, each having first and second connection terminals exposed from the resin, a capacitor including third and fourth connection terminals, a cooler directly contacting the semiconductor modules and the capacitor, a busbar including a first busbar connecting the first connection terminal to the third connection terminal, a second busbar connecting the second connection terminal to the fourth connection terminal, and a first insulating layer sandwiched by the first and second busbars, main surfaces of the first and second busbars being parallel to each other, a control circuit board configured to control the semiconductor modules, and a heat transfer component including a main body connected to the cooler, and a second insulating layer arranged on the main body, the main body being in contact with the busbar and the control circuit via the second insulating layer.Type: GrantFiled: October 1, 2019Date of Patent: December 15, 2020Assignee: FUJI ELECTRIC CO., LTD.Inventors: Motohito Hori, Yoshinari Ikeda, Akira Hirao, Mai Saitou, Ryoichi Kato
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Patent number: 10815396Abstract: Provided is a thermally conductive PSA sheet that comprises a PSA layer comprising a thermally conductive filler. The PSA sheet has a thermal resistance less than 6.0 cm2·K/W, and also has an adhesive strength N1 at 30 minutes of standing at 23° C. after applied to a stainless steel plate and an adhesive strength N2 at 23° C. after subjected to 5 minutes of heating at 80° C. after applied to a stainless steel plate, satisfying N2/N1?2.Type: GrantFiled: October 30, 2018Date of Patent: October 27, 2020Assignee: NITTO DENKO CORPORATIONInventors: Tatsuya Suzuki, Hiroki Ieda, Akira Hirao, Kenji Furuta
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Publication number: 20200263060Abstract: Provided are a PSA layer having a high refractive index and high adhesive strength and a PSA sheet having the PSA layer. The PSA layer comprises a PSA obtained using a PSA composition comprising a base polymer. Here, the PSA layer has a refractive index of 1.54 or higher and the base polymer has a glass transition temperature of 5° C. or lower.Type: ApplicationFiled: February 13, 2020Publication date: August 20, 2020Applicant: NITTO DENKO CORPORATIONInventors: Tatsuya SUZUKI, Akira HIRAO, Hiroki IEDA
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Publication number: 20200224000Abstract: A resin sheet with a pressure-sensitive adhesive layer including the resin sheet. The resin sheet including a main surface A and a main surface B opposite to each other across a thickness “d”, where the resin sheet has a 50% compression load of 20 N/cm2 or less at 23±5° C. in a direction of the thickness “d”, which is measured in conformity with a method of measuring a compression hardness described in JIS K 6767:1999; where the resin sheet has a Poisson's ratio at 23° C. of 0.10 or less; and the resin sheet has a thickness recovery ratio of 40% or more when compressed by 20% in the direction of the thickness “d” at 23° C.Type: ApplicationFiled: August 7, 2018Publication date: July 16, 2020Applicant: NITTO DENKO CORPORATIONInventors: Yusuke YAMANARI, Makoto SAITO, Akira HIRAO, Kenji FURUTA
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Patent number: 10647891Abstract: Provided is a PSA sheet that has a high level of moisture resistance while maintaining good holding power with reduced gas emission. The PSA sheet provided by this invention comprises a moisture-impermeable layer and a PSA layer provided to one face of the moisture-impermeable layer. The PSA layer comprises a polymer A having a weight average molecular weight of 5×104 or higher as a base polymer and a polymer B having a number average molecular weight of 1000 or higher and a weight average molecular weight lower than 5×104.Type: GrantFiled: March 18, 2019Date of Patent: May 12, 2020Assignee: NITTO DENKO CORPORATIONInventors: Kenji Furuta, Akira Hirao, Tatsuya Suzuki
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Publication number: 20200126597Abstract: Provided is an electronic device capable of bringing about excellent airtightness. The electronic device provided by this invention comprises a housing that forms an internal space to house components, and a cover seal. The housing has an opening and/or gap through which gases can move between the internal space and outside of the housing. The cover seal is bonded to the housing, covering the opening and/or gap. The cover seal is formed of at least one PSA sheet having a gas barrier layer and a PSA layer provided at least on one face of the gas barrier layer. The bonding interface between the housing and the cover seal has, along its surface, a first bonding area, a non-bonding area and a second bonding area in this order from the opening and/or gap towards the outside.Type: ApplicationFiled: October 11, 2019Publication date: April 23, 2020Inventors: Kenji FURUTA, Akira HIRAO, Tatsuya SUZUKI, Hiroki IEDA
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Publication number: 20200118986Abstract: Semiconductor equipment includes semiconductor modules sealed with a resin, each having first and second connection terminals exposed from the resin, a capacitor including third and fourth connection terminals, a cooler directly contacting the semiconductor modules and the capacitor, a busbar including a first busbar connecting the first connection terminal to the third connection terminal, a second busbar connecting the second connection terminal to the fourth connection terminal, and a first insulating layer sandwiched by the first and second busbars, main surfaces of the first and second busbars being parallel to each other, a control circuit board configured to control the semiconductor modules, and a heat transfer component including a main body connected to the cooler, and a second insulating layer arranged on the main body, the main body being in contact with the busbar and the control circuit via the second insulating layer.Type: ApplicationFiled: October 1, 2019Publication date: April 16, 2020Applicant: FUJI ELECTRIC CO., LTD.Inventors: Motohito HORI, Yoshinari IKEDA, Akira HIRAO, Mai SAITOU, Ryoichi KATO
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Patent number: 10593353Abstract: Provided is a PSA sheet that achieves both bonding reliability at a high temperature and reduction of outgassing. The PSA sheet provided by this invention comprises a substrate layer and a PSA layer provided to one face of the substrate layer. The PSA sheet exhibits a 180° peel strength of 1 N/20 mm or greater to stainless steel at 60° C. It has an amount of thermally released gas of 10 ?g/cm2 or less, determined at 130° C. for 30 minutes by GC-MS.Type: GrantFiled: December 18, 2018Date of Patent: March 17, 2020Assignee: NITTO DENKO CORPORATIONInventors: Kenji Furuta, Akira Hirao, Tatsuya Suzuki, Hiroki Ieda, Akira Chinen, Minami Watanabe
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Publication number: 20200002581Abstract: An object of the present invention is to provide an electrically debondable composition for forming an electrically debondable adhesive layer suitable for suppressing corrosion of a metal adherend surface. The present invention further provides an adhesive sheet having the electrically debondable adhesive layer, and an adhered body including the adhesive sheet. An electrically debondable composition of the present invention includes a polymer, an ionic liquid, and at least one additive selected from the group consisting of a carbodiimide compound, an adsorptive inhibitor and a chelate-forming metal deactivator.Type: ApplicationFiled: March 1, 2018Publication date: January 2, 2020Inventors: Kaori AKAMATSU, Kaori MIZOBATA, Ryo AWANE, Koji AKAZAWA, Junji YOKOYAMA, Akira HIRAO, Yosuke SHIMIZU, Akiko TANAKA
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Publication number: 20190284445Abstract: Provided is a PSA sheet that has a high level of moisture resistance while maintaining good holding power with reduced gas emission. The PSA sheet provided by this invention comprises a moisture-impermeable layer and a PSA layer provided to one face of the moisture-impermeable layer. The PSA layer comprises a polymer A having a weight average molecular weight of 5×104 or higher as a base polymer and a polymer B having a number average molecular weight of 1000 or higher and a weight average molecular weight lower than 5×104.Type: ApplicationFiled: March 18, 2019Publication date: September 19, 2019Inventors: Kenji FURUTA, Akira HIRAO, Tatsuya SUZUKI
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Publication number: 20190284447Abstract: Provided is a PSA sheet for use in electronic devices suitable for their downsizing and densification. The PSA sheet for electronic devices provided by this invention comprises a substrate and a PSA layer provided to at least one face of the substrate. The PSA sheet has a laser absorbance of 20% or higher in a wavelength range of 1000 nm to 1100 nm; has a thermal shrinkage SMD in its machine direction and a thermal shrinkage STD in its transverse direction (direction perpendicular to the machine direction) of both ?2 % or greater and 2% or less; and has an amount of thermally released gas of 1300 ng/cm2 or less when determined at 80° C. for 3 hours by GC/MS.Type: ApplicationFiled: March 18, 2019Publication date: September 19, 2019Inventors: Kenji FURUTA, Akira HIRAO, Tatsuya SUZUKI, Hiroki IEDA
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Publication number: 20190225838Abstract: Provided is a laminate sheet in which a first sheet, a PSA layer and a second sheet are laminated in this order. Of the first and second sheets, at least one is a release liner having a release face on the side facing the PSA layer. The PSA layer has a thickness of 200 ?m or greater. The first sheet has a tensile modulus of 1000 MPa or greater and the second sheet has a tensile modulus of 500 MPa or less.Type: ApplicationFiled: January 23, 2019Publication date: July 25, 2019Applicant: NITTO DENKO CORPORATIONInventors: Tatsuya Suzuki, Akira Hirao, Hiroki Ieda
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Publication number: 20190206427Abstract: Provided is a PSA sheet that achieves both bonding reliability at a high temperature and reduction of outgassing. The PSA sheet provided by this invention comprises a substrate layer and a PSA layer provided to one face of the substrate layer. The PSA sheet exhibits a 180° peel strength of 1 N/20 mm or greater to stainless steel at 60° C. It has an amount of thermally released gas of 10 ?g/cm2 or less, determined at 130° C. for 30 minutes by GC-MS.Type: ApplicationFiled: December 18, 2018Publication date: July 4, 2019Inventors: Kenji Furuta, Akira Hirao, Tatsuya Suzuki, Hiroki Ieda, Akira Chinen, Minami Watanabe
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Patent number: 10329457Abstract: Provided is a conductive pressure-sensitive adhesive tape having high flexibility. The conductive pressure-sensitive adhesive tape includes: a base material; and a pressure-sensitive adhesive layer arranged on at least one surface side of the base material, in which the tape has a total thickness of 30 ?m or less.Type: GrantFiled: September 15, 2017Date of Patent: June 25, 2019Assignee: NITTO DENKO CORPORATIONInventors: Akira Hirao, Ryo Morioka
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Publication number: 20190127611Abstract: Provided is a thermally conductive PSA sheet that comprises a PSA layer comprising a thermally conductive filler. The PSA sheet has a thermal resistance less than 6.0 cm2·K/W, and also has an adhesive strength N1 at 30 minutes of standing at 23° C. after applied to a stainless steel plate and an adhesive strength N2 at 23° C. after subjected to 5 minutes of heating at 80° C. after applied to a stainless steel plate, satisfying N2/N1?2.Type: ApplicationFiled: October 30, 2018Publication date: May 2, 2019Applicant: NITTO DENKO CORPORATIONInventors: Tatsuya SUZUKI, Hiroki IEDA, Akira HIRAO, Kenji FURUTA