Patents by Inventor Naoki Sakurai
Naoki Sakurai 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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Patent number: 11971569Abstract: There is provided a light emitting device that can be used as a light guide plate and has an excellent antireflection function to extraneous light, and an optical body includes: a base material; a macro concave-convex structure that is formed on one surface of the base material and emits internally propagating light that is injected in an inside of the base material from a side surface of the base material, from another surface of the base material; and a micro concave-convex structure formed periodically to follow each of both surfaces of the base material and a surface of the macro concave-convex structure, and having an average period of concavity and convexity of less than or equal to a wavelength of visible light. The surface of the macro concave-convex structure has an inclined surface, and an arrangement of the micro concave-convex structure is a zigzag arrangement.Type: GrantFiled: March 23, 2017Date of Patent: April 30, 2024Assignee: DEXERIALS CORPORATIONInventors: Shunichi Kajiya, Kyoko Sakurai, Katsuhiro Doi, Kazuya Hayashibe, Naoki Hanashima, Naoto Kaneko
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Publication number: 20240136318Abstract: A semiconductor device includes a semiconductor element having an Ni—V electrode and a conductor, the semiconductor element and the conductor being bonded via Sn-based lead-free solder. In the semiconductor device, an Sn—V compound layer and an (Ni, Cu)3Sn4 compound layer adjacent to the Sn—V compound are formed adjacent to an interface between the semiconductor element and the Sn-based lead-free solder. A manufacturing method for a semiconductor device according to the present invention includes: causing the Sn-based lead-free solder and the Ni—V electrode to react with each other to form an Sn—V layer and an (Ni, Cu)3Sn4 compound layer; and following formation of the Sn—V layer, leaving an unreacted layer of the Ni—V electrode, the unreacted layer having not reacted with the Sn-based lead-free solder, intact.Type: ApplicationFiled: February 21, 2022Publication date: April 25, 2024Inventors: Osamu IKEDA, Naoki SAKURAI, Takayuki OSHIMA, Takuma HAKUTO
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Patent number: 10888941Abstract: When a distance between an end portion of a brazing material and a downward extended line of a side surface of an insulating substrate is taken as “a”, and a distance between an end portion of a solder resist on the side of a solder and the downward extended line of the side surface of the insulating substrate is taken as “b”, the positional relationship a<b is satisfied. The position of the end portion of the solder is regulated by the solder resist, and the position of the end portion of the brazing material on the side of the side surface of the insulating substrate is closer to the side of the side surface of the insulating substrate than to the position of the end portion of the solder on the side of the side surface of the insulating substrate.Type: GrantFiled: October 24, 2018Date of Patent: January 12, 2021Assignee: HITACHI POWER SEMICONDUCTOR DEVICE, LTD.Inventors: Daichi Kawamura, Toru Masuda, Junpei Kusukawa, Naoki Sakurai
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Patent number: 10804765Abstract: A highly reliable electromechanical integral motor is provided. In the electromechanical integral motor including an axial gap type motor and a power conversion control device, the power conversion control device is mounted on an end bracket portion of the motor. Additionally, a space is provided between the end bracket portion of the motor and the power conversion control device. Further, the end bracket portion of the motor and the power conversion control device are fixed by a plurality of fixing members, and at least one set of the plurality of fixing members is disposed to be spaced apart from each other.Type: GrantFiled: November 4, 2016Date of Patent: October 13, 2020Assignee: HITACHI, LTD.Inventors: Hisashi Tanie, Yoshitaka Iwaji, Yuji Enomoto, Hirooki Tokoi, Takayoshi Nakamura, Naoki Sakurai, Fusao Houjyou, Kohei Matsushita
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Patent number: 10566876Abstract: To significantly improve a heat dissipation property of an axial gap rotary electric machine within a size necessary for configuring a motor. In an axial gap rotary electric machine comprising a stator and a rotor in an axial direction, the stator has a plurality of stator cores arranged in a circumferential direction and coils wound around the stator cores, and a heat pipe obtained by filling an inside of a metal hollow pipe with a refrigerant is arranged in a gap between adjacent coils formed in an outer diameter portion of the stator in a radial direction and a housing with a necessary insulation distance between the coils and the heat pipe. The heat pipe extends in a direction of a rotation axis and an opposite output side, and is in contact with a heat dissipating fin outside an end bracket on the opposite output side.Type: GrantFiled: February 25, 2016Date of Patent: February 18, 2020Assignee: Hitachi, Ltd.Inventors: Yuji Enomoto, Hirooki Tokoi, Naoki Sakurai, Hisashi Tanie, Kenta Deguchi
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Patent number: 10318679Abstract: In a calculation method of calculating a switching wave form of an inverter by expressing a wave form obtained by measurement or simulation using a function formula, an intermediate terminal is provided between an upper terminal and a lower terminal of an inverter arm and a power supply of a voltage function formula is provided between the upper terminal and the intermediate terminal or the intermediate terminal and the lower terminal. Further, it may be configured such that a variation impact from peripheral circuits at time of switching is calculated and voltage correction calculation is performed to prevent the calculated switching wave form from changing due to the calculation of the variation impact.Type: GrantFiled: December 9, 2015Date of Patent: June 11, 2019Assignee: Hitachi, Ltd.Inventors: Kazutami Tago, Naoki Sakurai, Kinya Kobayashi
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Publication number: 20190126374Abstract: When a distance between an end portion of a brazing material and a downward extended line of a side surface of an insulating substrate is taken as “a”, and a distance between an end portion of a solder resist on the side of a solder and the downward extended line of the side surface of the insulating substrate is taken as “b”, the positional relationship a<b is satisfied. The position of the end portion of the solder is regulated by the solder resist, and the position of the end portion of the brazing material on the side of the side surface of the insulating substrate is closer to the side of the side surface of the insulating substrate than to the position of the end portion of the solder on the side of the side surface of the insulating substrate.Type: ApplicationFiled: October 24, 2018Publication date: May 2, 2019Inventors: Daichi KAWAMURA, Toru MASUDA, Junpei KUSUKAWA, Naoki SAKURAI
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Publication number: 20190058374Abstract: To significantly improve a heat dissipation property of an axial gap rotary electric machine within a size necessary for configuring a motor. In an axial gap rotary electric machine comprising a stator and a rotor in an axial direction, the stator has a plurality of stator cores arranged in a circumferential direction and coils wound around the stator cores, and a heat pipe obtained by filling an inside of a metal hollow pipe with a refrigerant is arranged in a gap between adjacent coils formed in an outer diameter portion of the stator in a radial direction and a housing with a necessary insulation distance between the coils and the heat pipe. The heat pipe extends in a direction of a rotation axis and an opposite output side, and is in contact with a heat dissipating fin outside an end bracket on the opposite output side.Type: ApplicationFiled: February 25, 2016Publication date: February 21, 2019Applicant: Hitachi .Ltd.Inventors: Yuji ENOMOTO, Hirooki TOKOI, Naoki SAKURAI, Hisashi TANIE, Kenta DEGUCHI
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Publication number: 20180358863Abstract: An object of the present invention is to provide a highly reliable electromechanical integral motor. In an electromechanical integral motor including an axial gap type motor and a power conversion control device, the power conversion control device is mounted on an end bracket portion of the motor, a space is installed between the end bracket portion of the motor and the power conversion control device, the end bracket portion of the motor and the power conversion control device are fixed by a plurality of fixing members, and at least one set of the plurality of fixing members is disposed to be spaced apart from each other.Type: ApplicationFiled: November 4, 2016Publication date: December 13, 2018Applicant: Hitachi, Ltd.Inventors: Hisashi TANIE, Yoshitaka IWAJI, Yuji ENOMOTO, Hirooki TOKOI, Takayoshi NAKAMURA, Naoki SAKURAI, Fusao HOUJYOU, Kohei MATSUSHITA
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Patent number: 9594069Abstract: In a vibration information detection step, a probe is inserted into a food sample, and any one of the displacement, the velocity or the acceleration of a vibration occurring on the probe by the insertion is detected as vibration information (step S1). In a frequency band dividing step, the vibration information is divided by a band pass filter into individual pieces of vibration information in each of a plurality of frequency bands (step S2). In a food texture index calculation step, a food texture index value based on vibrational energy per unit time in each of the frequency bands is calculated using a computer from the vibration information in each of the frequency bands and the center frequency of the corresponding frequency band (step S3).Type: GrantFiled: August 31, 2011Date of Patent: March 14, 2017Assignee: HIROSHIMA UNIVERSITYInventors: Naoki Sakurai, Shinichiro Iwatani, Hidemi Akimoto
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Publication number: 20160171139Abstract: In a calculation method of calculating a switching wave form of an inverter by expressing a wave form obtained by measurement or simulation using a function formula, an intermediate terminal is provided between an upper terminal and a lower terminal of an inverter arm and a power supply of a voltage function formula is provided between the upper terminal and the intermediate terminal or the intermediate terminal and the lower terminal. Further, it may be configured such that a variation impact from peripheral circuits at time of switching is calculated and voltage correction calculation is performed to prevent the calculated switching wave form from changing due to the calculation of the variation impact.Type: ApplicationFiled: December 9, 2015Publication date: June 16, 2016Inventors: Kazutami TAGO, Naoki SAKURAI, Kinya KOBAYASHI
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Publication number: 20130228016Abstract: In a vibration information detection step, a probe is inserted into a food sample, and any one of the displacement, the velocity or the acceleration of a vibration occurring on the probe by the insertion is detected as vibration information (step S1). In a frequency band dividing step, the vibration information is divided by a band pass filter into individual pieces of vibration information in each of a plurality of frequency bands (step S2). In a food texture index calculation step, a food texture index value based on vibrational energy per unit time in each of the frequency bands is calculated using a computer from the vibration information in each of the frequency bands and the center frequency of the corresponding frequency band (step S3).Type: ApplicationFiled: August 31, 2011Publication date: September 5, 2013Applicant: HIROSHIMA UNIVERSITYInventors: Naoki Sakurai, Shinichiro Iwatani, Hidemi Akimoto
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Patent number: 8399466Abstract: A composition for regenerative treatment of cartilage disease, which comprises a PDE4 inhibitor as an active ingredient, specifically a composition comprising a PDE4 inhibitor and a biocompatible and biodegradable polymer is provided, which composition, when formulated into a form suited to administer locally to affected cartilage region, such as microsphere preparation, can provide a pharmaceutical composition showing an excellent effect in regenerative treatment of cartilage.Type: GrantFiled: May 18, 2010Date of Patent: March 19, 2013Assignee: Mitsubishi Tanabe Pharma CorporationInventors: Masaharu Takigawa, Naoki Sakurai, Toshiki Takagi, Noriyuki Yanaka, Yuji Horikiri, Takashi Tamura
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Patent number: 8299836Abstract: In a level shift circuit, when a power-source voltage variation dV/dt of a high voltage side occurs and influences on a logic level of a circuit, the passing through of a malfunction signal is masked and prevented in the first and second logic circuits, by a signal from a time-constant generation circuit or a portion where a power voltage variation occurs in advance, by utilizing the fact that this variation occurs both at a set side and a reset side. When the power source voltage variation dV/dt is generated at a high voltage side, sufficient allowance in the timing of this masking prevents an erroneous signal from being transmitted to a flip-flop, and a control signal is transmitted from a low voltage side circuit not giving malfunction to a high voltage side circuit, even when there is a production variation in each element in semiconductor processes.Type: GrantFiled: February 17, 2011Date of Patent: October 30, 2012Assignee: Hitachi, Ltd.Inventors: Naoki Sakurai, Junichi Sakano, Seigoh Yukutake
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Patent number: 8252794Abstract: A composition for regenerative treatment of cartilage disease, which comprises a PDE4 inhibitor as an active ingredient, specifically a composition comprising a PDE4 inhibitor and a biocompatible and biodegradable polymer is provided, which composition, when formulated into a form suited to administer locally to affected cartilage region, such as microsphere preparation, can provide a pharmaceutical composition showing an excellent effect in regenerative treatment of cartilage.Type: GrantFiled: February 16, 2007Date of Patent: August 28, 2012Assignee: Mitsubishi Tanabe Pharma CorporationInventors: Masaharu Takigawa, Naoki Sakurai, Toshiki Takagi, Noriyuki Yanaka, Yuji Horikiri, Takashi Tamura
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Publication number: 20120153719Abstract: A semiconductor element control device that controls a semiconductor element that performs switching operation for converting DC power into AC power, or AC power into DC power, includes: a drive unit that outputs a drive signal for controlling the switching operation of the semiconductor element to a terminal of the semiconductor element; a short-circuit detection unit that detects short-circuit of the semiconductor element on the basis of the voltage at the terminal, and outputs a short-circuit detection signal; and a drive interruption unit that interrupts current flowing in the semiconductor element on the basis of the short-circuit detection signal output from the short-circuit detection unit.Type: ApplicationFiled: July 22, 2010Publication date: June 21, 2012Applicant: Hitachi Automotive Systems, Ltd.Inventors: Masamitsu Inaba, Naoki Sakurai
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Publication number: 20110227626Abstract: In a level shift circuit, when a power-source voltage variation dV/dt of a high voltage side occurs and influences on a logic level of a circuit, the passing through of a malfunction signal is masked and prevented in the first and second logic circuits, by a signal from a time-constant generation circuit or a portion where a power voltage variation occurs in advance, by utilizing the fact that this variation occurs both at a set side and a reset side. When the power source voltage variation dV/dt is generated at a high voltage side, sufficient allowance in the timing of this masking prevents an erroneous signal from being transmitted to a flip-flop, and a control signal is transmitted from a low voltage side circuit not giving malfunction to a high voltage side circuit, even when there is a production variation in each element in semiconductor processes.Type: ApplicationFiled: February 17, 2011Publication date: September 22, 2011Inventors: Naoki SAKURAI, Junichi Sakano, Seigoh Yukutake
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Patent number: 7973405Abstract: An integrated circuit for driving a semiconductor device, which is adaptable for demands, such as a higher output (larger current), a higher voltage, and a smaller loss, and has a small size, is produced at a low cost, and has high reliability. A power converter including such an integrated circuit is also provided. Circuit elements constituting a drive section of an upper arm drive circuit 212, a level shift circuit 20 including a current sensing circuit 210, a drive section of a lower arm drive circuit 222, and a drive signal processing circuit 224 are integrated and built in one high withstand voltage IC chip 200. Circuit elements constituting a final output stage buffer section 213 of the upper arm drive circuit 212 are built in a vertical p-channel MOS-FET chip 213p and a vertical n-channel MOS-FET chip 213n.Type: GrantFiled: May 20, 2010Date of Patent: July 5, 2011Assignee: Hitachi, Ltd.Inventors: Yoshimasa Takahashi, Naoki Sakurai, Masashi Yura, Masahiro Iwamura, Mutsuhiro Mori
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Patent number: 7957167Abstract: A high-reliability IGBT drive device in which the high- and low-voltage side IGBTs are complementarily ON/OFF controlled before and after dead time. A reset pulse that turns OFF the high-voltage side IGBT is generated during the dead time as described in the following example. The reset pulse is generated immediately before an ON instruction for the low-voltage side IGBT, so that a period that begins immediately before the ON instruction for the low-voltage side IGBT and overlaps with the ON instruction, continuously during the dead time, continuously during dead time immediately before the low-voltage side IGBT turns ON, or in such a manner as to invalidate the ON instruction for the low-voltage side IGBT when an ON state of the high-voltage side IGBT is observed.Type: GrantFiled: May 24, 2007Date of Patent: June 7, 2011Assignee: Hitachi, Ltd.Inventors: Koji Yamaguchi, Naoki Sakurai
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Patent number: 7851866Abstract: An object of the present invention is to provide an electric power converter including means for accurately detecting a principal current of IGBT. An electric power conversion device according to the present invention includes principal current estimation means for estimating a principal current by using: an output of temperature measuring means whose diode is disposed in the same semiconductor substrate as an IGBT including an emitter having flowing therethrough the principal current and a sense emitter having flowing therethrough a sense current proportional to the principal current; the sense current; and the information, preliminarily stored in memory means, on the relationship among the semiconductor substrate temperature, the principal current and the sense currant.Type: GrantFiled: January 25, 2006Date of Patent: December 14, 2010Assignee: Hitachi, Ltd.Inventors: Naoki Sakurai, Mutsuhiro Mori