Patents by Inventor Daisuke Arai
Daisuke Arai 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: 20200076290Abstract: A power conversion circuit includes: a MOSFET having a super junction structure; an inductive load; and a freewheel diode. A switching frequency of the MOSFET is 10 kHz or more. When the MOSFET is turned off, a first period during which a drain current decreases, a second period during which the drain current increases, and a third period during which the drain current decreases again appear in this order. The freewheel diode is an Si-FRD or an SiC-SBD, and current density obtained by dividing a current value of the forward current by an area of an active region of the freewheel diode falls within a range of 200 A/cm2 to 400 A/cm2 when the freewheel diode is the Si-FRD, and the current density falls within a range of 400 A/cm2 to 1500 A/cm2 when the freewheel diode is the SiC-SBD.Type: ApplicationFiled: November 17, 2017Publication date: March 5, 2020Inventors: Daisuke ARAI, Shigeru HISADA, Mizue KITADA
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Publication number: 20200020536Abstract: A MOSFET includes: a semiconductor base substrate having n-type column regions and p-type column regions, the n-type column regions and the p-type column regions forming a super junction structure; and a gate electrode which is formed on a first main surface side of the semiconductor base substrate by way of a gate insulation film, wherein crystal defects whose density is increased locally as viewed along a depth direction are formed in the n-type column regions and the p-type column regions, using the first main surface as a reference and assuming a depth to a deepest portion of the super junction structure as Dp, a depth at which density of the crystal defects exhibits a maximum value as Dd, and a half value width of density distribution of the crystal defects as W, a relationship of 0.25Dp?Dd<0.95Dp and a relationship of 0.05Dp<W<0.5Dp are satisfied.Type: ApplicationFiled: July 26, 2019Publication date: January 16, 2020Inventors: Daisuke ARAI, Mizue KITADA, Takeshi ASADA, Noriaki SUZUKI, Koichi Murakami
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Publication number: 20200002514Abstract: A golf ball includes a core and a cover. The core is formed of a material molded under heat from a rubber composition. The rubber composition includes components (A) through (C). The components (A) through (C) are (A) a base rubber, (B) an organic peroxide, and (C) a water providing agent. The water providing agent releases water at a vulcanization temperature at which the rubber composition is vulcanized. The dissociation rate of water of the water providing agent in the case of heating the water providing agent up to the vulcanization temperature of the rubber composition is 60% by mass or more.Type: ApplicationFiled: April 15, 2019Publication date: January 2, 2020Inventors: Eiji YAMANAKA, Daisuke ARAI
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Publication number: 20200001143Abstract: A rubber composition for golf balls includes (a) a base rubber, (b) a co-crosslinking agent which is an ?,?-unsaturated carboxylic acid and/or a metal salt thereof, (c) an organic peroxide, (d) water or an alcohol, and (e) an antioxidant which is a benzoimidazole of the following general formula and/or a metal salt thereof. When the rubber composition is used in constituent members of a golf ball, especially the core, the golf ball exhibits low spin properties on shots, resulting in an improved flight performance and enabling a good durability to be maintained.Type: ApplicationFiled: June 21, 2019Publication date: January 2, 2020Applicant: BRIDGESTONE SPORTS CO., LTDInventors: Jun SHINDO, Daisuke ARAI
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Publication number: 20200001142Abstract: A golf ball includes a core and a cover. The core is formed of a material molded under heat from a rubber composition. The rubber composition includes components (A) through (C). The components (A) through (C) are (A) a base rubber, (B) an organic peroxide, and (C) a metal salt containing hydration water.Type: ApplicationFiled: April 15, 2019Publication date: January 2, 2020Inventors: Eiji YAMANAKA, Daisuke ARAI
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Patent number: 10475917Abstract: A MOSFET includes a semiconductor base substrate where a super junction structure is formed of an n-type column region and a p-type column region. A total amount of a dopant in the n-type column region is set to a value greater than a total amount of a dopant in the p-type column region. The MOSFET is configured to be operated during a period from a point of time when a drain current starts to decrease to a point of time when the drain current becomes 0 for the first time in response to turning off of the MOSFET such that a first period during which the drain current is decreased, a second period during which the drain current is increased or the drain current becomes constant, and a third period during which the drain current is decreased again occur in this order.Type: GrantFiled: May 21, 2018Date of Patent: November 12, 2019Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.Inventors: Daisuke Arai, Shigeru Hisada, Mizue Kitada, Takeshi Asada
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Patent number: 10468518Abstract: A power semiconductor device of the present invention includes: a semiconductor base body which has a super junction structure formed of a plurality of first conductive-type columnar regions and a plurality of second conductive-type columnar regions; a plurality of trenches; gate insulation films; gate electrodes; an interlayer insulation film; contact holes formed such that two or more contact holes are formed between two trenches disposed adjacently to each other; metal plugs formed by filling the inside of the contact holes with metal; and an electrode, wherein a first conductive-type high concentration diffusion region is formed only between the trench and the metal plug disposed closest to the trench between each two trenches disposed adjacently to each other. According to the power semiconductor device of the present invention, it is possible to provide a power semiconductor device which satisfies a demand for reduction in cost and downsizing of electronic equipment, and has a large breakdown strength.Type: GrantFiled: January 16, 2017Date of Patent: November 5, 2019Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.Inventors: Mizue Kitada, Takeshi Asada, Takeshi Yamaguchi, Noriaki Suzuki, Daisuke Arai
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Patent number: 10468480Abstract: Provided is a MOSFET which includes: a semiconductor base substrate having an n-type column region and a p-type column region, a base region and a source region, wherein a super junction structure is formed of the n-type column region and the p-type column region; a trench having side walls and a bottom; a gate electrode formed in the trench by way of a gate insulation film; a carrier compensation electrode positioned between the gate electrode and the bottom of the trench; an insulation region separating the carrier compensation electrode from the side walls and the bottom; and a source electrode electrically connected to the source region and also electrically connected to the carrier compensation electrode. According to the MOSFET of the present invention, even when an irregularity in a charge balance occurs around the gate, an irregularity in switching characteristics when the MOSFET is turned off can be decreased.Type: GrantFiled: November 11, 2016Date of Patent: November 5, 2019Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.Inventors: Daisuke Arai, Mizue Kitada
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Publication number: 20190326388Abstract: Provided is a MOSFET which includes: a semiconductor base substrate having an n-type column region and a p-type column region, a base region and a source region, wherein a super junction structure is formed of the n-type column region and the p-type column region; a trench having side walls and a bottom; a gate electrode formed in the trench by way of a gate insulation film; a carrier compensation electrode positioned between the gate electrode and the bottom of the trench; an insulation region separating the carrier compensation electrode from the side walls and the bottom; and a source electrode electrically connected to the source region and also electrically connected to the carrier compensation electrode. According to the MOSFET of the present invention, even when an irregularity in a charge balance occurs around the gate, an irregularity in switching characteristics when the MOSFET is turned off can be decreased.Type: ApplicationFiled: November 11, 2016Publication date: October 24, 2019Inventors: Daisuke ARAI, Mizue KITADA
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Patent number: 10453661Abstract: An ion filter is used for a gas detector including a gas electron multiplier. The ion filter includes: an insulating substrate; a first patterned conductive layer on one main surface of the insulating substrate; and a second patterned conductive layer on another main surface of the insulating substrate. The ion filter has a plurality of through-holes formed along a thickness direction of the insulating substrate on which the first patterned conductive layer and the second patterned conductive layer are formed. The one main surface of the insulating substrate is disposed on an upstream side in a movement direction of electrons in the gas detector. The other main surface of the insulating substrate is disposed on a downstream side in the movement direction of the electrons in the gas detector. The first patterned conductive layer has a line width thicker than a line width of the second patterned conductive layer.Type: GrantFiled: December 2, 2016Date of Patent: October 22, 2019Assignee: FUJIKURA LTD.Inventor: Daisuke Arai
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Patent number: 10439056Abstract: A power semiconductor device according to the present invention has a super junction structure, and includes a low-resistance semiconductor layer, an n?-type column region, p?-type column regions, a base region, trenches, gate insulation films, gate electrodes, source regions, interlayer insulation films, contact holes, metal plugs, p+-type diffusion regions, a source electrode and a gate pad electrode. An active element part includes an n?-type column region between a predetermined p?-type column region disposed closest to a gate pad part and a predetermined n?-type column region disposed closest to the gate pad part among the n?-type column regions which are in contact with the trenches. The present invention provides a power semiconductor device which can satisfy a demand for reduction in cost and downsizing of electronic equipment, can lower ON resistance while maintaining a high withstand voltage, and can possess a large breakdown resistance.Type: GrantFiled: March 31, 2016Date of Patent: October 8, 2019Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.Inventors: Daisuke Arai, Mizue Kitada, Takeshi Asada, Takeshi Yamaguchi, Noriaki Suzuki
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Patent number: 10411141Abstract: A semiconductor device includes: a semiconductor base body where a second semiconductor layer is stacked on a first semiconductor layer, a trench is formed on a surface of the second semiconductor layer, and a third semiconductor layer which is formed of an epitaxial layer is formed in the inside of the trench; a first electrode; an interlayer insulation film which has a predetermined opening; and a second electrode, wherein metal is filled in the opening, the opening is disposed at a position avoiding a center portion of the third semiconductor layer, the second electrode is connected to the third semiconductor layer through the metal, and a surface of the center portion of the third semiconductor layer is covered by the interlayer insulation film.Type: GrantFiled: February 27, 2017Date of Patent: September 10, 2019Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.Inventors: Mizue Kitada, Takeshi Asada, Takeshi Yamaguchi, Noriaki Suzuki, Daisuke Arai
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Patent number: 10388923Abstract: In a vehicle battery unit, since a second support plate (30B) and a second end plate (29B) of a second battery module (22B) having a plurality of battery cells (21) stacked are placed on top of a first support plate (30A) and a first end plate (29A) of a first battery module (22A) having a plurality of the battery cells (21), it is possible to prevent the weight of the second battery module (22B) from being imposed on the battery cells (21) of the first battery module (22A). Moreover, since it is not necessary to provide on the exterior of the first battery module (22A) a member for supporting the weight of the second battery module (22B), it is possible to reduce the dimensions of the first battery module (22A).Type: GrantFiled: October 13, 2011Date of Patent: August 20, 2019Assignee: HONDA MOTOR CO., LTD.Inventors: Koichi Takahashi, Eiji Koike, Daisuke Arai, Takurou Kamada, Kentaro Shibuya, Harumi Takedomi
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Patent number: 10365679Abstract: A regenerative current detection circuit includes a first power MOS transistor that is configured as a current mirror to a second power MOS transistor connected to drive a motor winding, a first feedback amplifier that compares a first regenerative current that flows in the first power MOS transistor with a second regenerative current that flows in the second power MOS transistor and outputs a comparison result, the first regenerative current being obtained by multiplying the second regenerative current by a current mirror ratio, and a current detection circuit that outputs a detection current based on the comparison result.Type: GrantFiled: August 29, 2017Date of Patent: July 30, 2019Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Daisuke Arai, Tooru Asakawa, Masahiro Shimozono, Katsumi Shiokawa
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Publication number: 20190221664Abstract: A MOSFET used in a power conversion circuit having a reactor, a power source, the MOSFET, and a rectifier element, includes a semiconductor base substrate with a super junction structure formed of an n-type column region and a p-type column region. A total amount of a dopant in the n-type column region is higher than a total amount of a dopant in the p-type column region. The MOSFET is configured to be operated during a period from a point of time when a drain current starts to decrease to a point of time when the drain current becomes 0 for the first time in response to turning off of the MOSFET such that a first period during which the drain current decreases, a second period during which the drain current increases, and a third period during which the drain current decreases again appear in this order.Type: ApplicationFiled: September 2, 2016Publication date: July 18, 2019Inventors: Daisuke ARAI, Shigeru HISADA, Mizue KITADA, Takeshi ASADA
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Publication number: 20190214496Abstract: A MOSFET used in a power conversion circuit including a reactor, a power source, the MOSFET, and a rectifier element, includes a semiconductor base substrate having an n-type column region and a p-type column region, the n-type column region and the p-type column region forming a super junction structure, the n-type column region and the p-type column region are formed such that a total amount of a dopant in the p-type column region is set higher than a total amount of a dopant in the n-type column region, and the MOSFET is configured to be operated in response to turning on of the MOSFET such that at a center of the n-type column region as viewed in a plan view, a low electric field region having lower field intensity than areas of the n-type column region other than the center of the n-type column region appears.Type: ApplicationFiled: September 16, 2016Publication date: July 11, 2019Inventors: Daisuke ARAI, Shigeru HISADA, Mizue KITADA, Takeshi ASADA
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Publication number: 20190161298Abstract: A sheet conveying device, which is included in an image forming apparatus, includes a pair of rotary bodies configured to convey a sheet and correct a positional deviation of the sheet, a pair of downstream side sheet conveying bodies disposed downstream from the pair of rotary bodies in a sheet conveying direction and configured to convey the sheet, and a detector configured to detect separation of the pair of rotary bodies. The pair of rotary bodies moves the sheet by moving from a home position on a sheet conveyance passage through which the sheet passes. The pair of rotary bodies moves to the home position while the pair of downstream side sheet conveying bodies is conveying the sheet, in response to detection of the separation of the pair of rotary bodies by the detector.Type: ApplicationFiled: September 25, 2018Publication date: May 30, 2019Applicant: Ricoh Company, Ltd.Inventors: Daisuke ARAI, Takehiro FUJITA
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Publication number: 20190165161Abstract: A MOSFET includes a semiconductor base substrate where a super junction structure is formed of an n-type column region and a p-type column region. A total amount of a dopant in the n-type column region is set to a value greater than a total amount of a dopant in the p-type column region. The MOSFET is configured to be operated during a period from a point of time when a drain current starts to decrease to a point of time when the drain current becomes 0 for the first time in response to turning off of the MOSFET such that a first period during which the drain current is decreased, a second period during which the drain current is increased or the drain current becomes constant, and a third period during which the drain current is decreased again occur in this order.Type: ApplicationFiled: May 21, 2018Publication date: May 30, 2019Inventors: Daisuke ARAI, Shigeru HISADA, Mizue KITADA, Takeshi ASADA
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Patent number: 10290734Abstract: A MOSFET includes: a semiconductor base substrate having a super junction structure; and a gate electrode formed on a first main surface side of the semiconductor base substrate by way of a gate insulation film. In a graph where a depth x at a predetermined depth position in the super junction structure is taken on an axis of abscissas, and an average positive charge density ?(x) at the predetermined depth position in the super junction structure is taken on an axis of ordinates, the average positive charge density ?(x) at a predetermined depth position of the super junction structure when the super junction structure is depleted by turning off the MOSFET is expressed by an upward convex curve projecting in a right upward direction.Type: GrantFiled: March 17, 2017Date of Patent: May 14, 2019Assignee: SHINDENGEN ELECTRIC MANUFACTURING CO., LTD.Inventors: Daisuke Arai, Mizue Kitada
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Publication number: 20190081172Abstract: A MOSFET includes: a semiconductor base substrate having a super junction structure; and a gate electrode formed on a first main surface side of the semiconductor base substrate by way of a gate insulation film. In a graph where a depth x at a predetermined depth position in the super junction structure is taken on an axis of abscissas, and an average positive charge density ?(x) at the predetermined depth position in the super junction structure is taken on an axis of ordinates, the average positive charge density ?(x) at a predetermined depth position of the super junction structure when the super junction structure is depleted by turning off the MOSFET is expressed by an upward convex curve projecting in a right upward direction.Type: ApplicationFiled: March 17, 2017Publication date: March 14, 2019Inventors: Daisuke ARAI, Mizue KITADA