Patents by Inventor Hiroatsu Tokuda
Hiroatsu Tokuda 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: 7468554Abstract: A heat sink board having a first heat sink and a second heat sink with a smaller linear expansion coefficient than that of the first heat sink and being bonded to the first heat sink to form the heat sink board. The second heat sink is fitted to the first heat sink, and a material of the first heat sink in the vicinity of a boundary between the fitted heat sinks is plastically deformed for close adhesion to the second heat sink. A forming method makes bonding between the first and second heat sinks possible at room temperature, and the heat sink board made of a composite member having a high flat-surface accuracy can be easily and reliably obtained.Type: GrantFiled: March 11, 2005Date of Patent: December 23, 2008Assignee: Hitachi, Ltd.Inventors: Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima, Masayuki Kobayashi
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Publication number: 20080179732Abstract: A method comprising constraining a circumference of a blank of a Cu—Mo alloy and one of surfaces to be worked with the use of a die, and using a working punch or a counter punch to apply working pressures to the other of the surfaces to be worked, thereby obtaining a cup-shaped body.Type: ApplicationFiled: October 30, 2007Publication date: July 31, 2008Applicant: HITACHI LTD.Inventors: Masayuki Kobayashi, Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima
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Publication number: 20070147005Abstract: The invention provides a heat sink board and a manufacturing method thereof, which can realize a high product accuracy and superior productivity. To that end, a second heat sink (3) having a smaller linear expansion coefficient than that of a first heat sink (2) is bonded to the first heat sink (2) to form a heat sink board. The second heat sink (3) is fitted to the first heat sink (2), and a material of the first heat sink (2) in the vicinity of a boundary between the fitted heat sinks is plastically deformed for close adhesion to the second heat sink (3). Such a forming method makes bonding between the first and second heat sinks possible at room temperature, and the heat sink board made of a composite member having a high flat-surface accuracy can be easily and reliably obtained.Type: ApplicationFiled: March 11, 2005Publication date: June 28, 2007Applicant: HITACHI LTD.Inventors: Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima, Masayuki Kobayashi
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Publication number: 20060248696Abstract: A method comprising constraining a circumference of a blank of a Cu—Mo alloy and one of surfaces to be worked with the use of a die, and using a working punch or a counter punch to apply working pressures to the other of the surfaces to be worked, thereby obtaining a cup-shaped body.Type: ApplicationFiled: May 22, 2006Publication date: November 9, 2006Applicant: HITACHI LTD.Inventors: Masayuki Kobayashi, Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima
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Patent number: 6815073Abstract: The present invention has an object to enhance the reliability of the electrical connection of a silver-based conductor film on the surface of a glass ceramic board. In order to achieve the object, according to the present invention, by the use of a conductor paste containing a silver particle having a specific surface area of 0.3 m2/g to 3.0 m2/g and no glass, printing is carried out on a glass ceramic board and the conductor paste is fired at a firing temperature having a difference of ±50° C. from a softening temperature of amorphous borosilicate glass contained in the glass ceramic. Consequently, a silver-based conductor film having high reliability of the electrical connection is formed on the ceramic board.Type: GrantFiled: August 30, 2001Date of Patent: November 9, 2004Assignee: Hitachi, Ltd.Inventors: Hirayoshi Tanei, Tsuyoshi Fujita, Masato Kirigaya, Yasuo Akutsu, Kaoru Uchiyama, Hiroshi Soma, Hiroatsu Tokuda
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Publication number: 20040147083Abstract: A method comprising constraining a circumference of a blank of a Cu—Mo alloy and one of surfaces to be worked with the use of a die, and using a working punch or a counter punch to apply working pressures to the other of the surfaces to be worked, thereby obtaining a cup-shaped body.Type: ApplicationFiled: January 9, 2004Publication date: July 29, 2004Applicant: Hitachi, Ltd.Inventors: Masayuki Kobayashi, Kouji Harada, Hiroatsu Tokuda, Kazuo Ojima
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Patent number: 6586105Abstract: The invention provides a packaging structure applied to an automotive component having semiconductors and electronic parts mounted on a ceramic base, characterized in that the semiconductors and electronic parts are partly or entirely sealed with a thixotropic silicone gel which has a thixotropy index of about 1.5-3.6 and a penetration depth of about 6-10 mm and a rate of change in viscosity of less than 10% of the initial value.Type: GrantFiled: April 3, 2001Date of Patent: July 1, 2003Assignee: Hitachi, Ltd.Inventors: Shuji Eguchi, Masahiko Asano, Mutsumi Watanabe, Kunito Nakatsuru, Hiroatsu Tokuda
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Patent number: 6517784Abstract: Exhaust gas from internal combustion engines is treated with catalyst comprising an inorganic oxide supporter which supports at least one of noble metals selected from Rh, Pt, and Pd, alkali rare earth metals, rare earth metals, and magnesium in order to remove NOx effectively with superior durability of the catalyst notwithstanding the internal combustion engine is under a stoichiometric operation condition or a lean burning operation condition.Type: GrantFiled: June 7, 2000Date of Patent: February 11, 2003Assignee: Hitachi, Ltd.Inventors: Hidéhiro Iizuka, Osamu Kuroda, Toshio Ogawa, Akira Kato, Hiroshi Miyadera, Yuichi Kitahara, Hiroatsu Tokuda
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Publication number: 20020197488Abstract: The present invention has an object to enhance the reliability of the electrical connection of a silver-based conductor film on the surface of a glass ceramic board. In order to achieve the object, according to the present invention, by the use of a conductor paste containing a silver particle having a specific surface area of 0.3 m2/g to 3.0 m2/g and no glass, printing is carried out on a glass ceramic board and the conductor paste is fired at a firing temperature having a difference of ±50° C. from a softening temperature of amorphous borosilicate glass contained in the glass ceramic. Consequently, a silver-based conductor film having high reliability of the electrical connection is formed on the ceramic board.Type: ApplicationFiled: August 30, 2001Publication date: December 26, 2002Inventors: Hirayoshi Tanei, Tsuyoshi Fujita, Masato Kirigaya, Yasuo Akutsu, Kaoru Uchiyama, Hiroshi Soma, Hiroatsu Tokuda
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Publication number: 20020031672Abstract: The invention provides a packaging structure applied to an automotive component having semiconductors and electronic parts mounted on a ceramic base, characterized in that the semiconductors and electronic parts are partly or entirely sealed with a thixotropic silicone gel which has a thixotropy index of about 1.5-3.6 and a penetration depth of about 6-10 mm and a rate of change in viscosity of less than 10% of the initial value.Type: ApplicationFiled: April 3, 2001Publication date: March 14, 2002Inventors: Shuji Eguchi, Masahiko Asano, Mutsumi Watanabe, Kunito Nakatsuru, Hiroatsu Tokuda
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Patent number: 6093377Abstract: Exhaust gas from internal combustion engines is treated with catalyst comprising an inorganic oxide supporter which supports at least one of noble metals selected from Rh, Pt, and Pd, alkali rare earth metals, rare earth metals, and magnesium in order to remove NOx effectively with superior durability of the catalyst notwithstanding the internal combustion engine is under a stoichiometric operation condition or a lean burning operation condition.Type: GrantFiled: January 11, 1996Date of Patent: July 25, 2000Assignee: Hitachi, Ltd.Inventors: Hidehiro Iizuka, Osamu Kuroda, Toshio Ogawa, Akira Kato, Hiroshi Miyadera, Yuichi Kitahara, Hiroatsu Tokuda
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Patent number: 6045764Abstract: An exhaust gas purifying catalyst is provided for purifying NOx contained in an exhaust gas from an internal combustion engine of a vehicle operated at a high air fuel ratio due to excessive oxygen, using unburnt HC or CO in the exhaust gas as a reducing agent. The catalyst comprises platinum, strontium and a rare earth metal, as active components, each supported on a support of inorganic oxide. The active components of the catalyst include platinum of 0.01-3.7 by wt ratio, strontium of 0.01-55 by wt ratio and a rare earth metal of 0.01-36 wt ratio, per the inorganic oxide of 100 by wt ratio.Type: GrantFiled: April 29, 1996Date of Patent: April 4, 2000Assignee: Hitachi, Ltd.Inventors: Hidehiro Iizuka, Osamu Kuroda, Toshio Ogawa, Hisao Yamashita, Shigeru Azuhata, Yuichi Kitahara, Takeshi Atago, Hiroatsu Tokuda, Takao Ishikawa, Hiroshi Hanaoka, Hiroshi Tobita, Shinichi Ichikawa, Toshifumi Hiratsuka
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Patent number: 5508923Abstract: The invention provides a system for controlling a vehicle engine according to a plurality of stored torque patterns for various vehicle operating environments, based upon the accelerator pedal position and the vehicle speed. A vehicle environment, detection unit evaluates the vehicle environment and a target drive shaft torque pattern is selected from the plurality of target drive shaft torque patterns stored in a torque pattern storage. A target drive shaft torque calculating unit determines a target drive shaft torque from the selected target drive shaft torque pattern, the detected accelerator pedal operating amount and the detected vehicle speed. Finally, an engine output calculator determines an engine output at which a vehicle drive shaft generates the target drive shaft torque, and outputs the determined engine output to an engine output control unit.Type: GrantFiled: February 23, 1993Date of Patent: April 16, 1996Assignee: Hitachi, Ltd.Inventors: Masahiko Ibamoto, Hiroatsu Tokuda, Michimasa Horiuchi, Naoyuki Ozaki, Yutaka Nishimura
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Patent number: 5496227Abstract: Torque control method and apparatus for an internal combustion engine of a motor vehicle. A value of a desired drive shaft torque for the motor vehicle is determined on the basis of at least an accelerator pedal stroke for thereby controlling a drive shaft torque of the motor vehicle so as to assume the desired drive shaft torque value by controlling a gear ratio of a transmission gear coupling an output shaft of the engine to at least a drive shaft of the motor vehicle on the basis of the value of the desired drive shaft torque as determined. A gear ratio of the transmission gear and a flow rate of intake air fed to the engine are determined through different procedures in dependence on whether or not a torque transfer mechanism coupling the output shaft of the engine to an input shaft of the transmission gear is in a lock-up state in which the output shaft and the input shaft are coupled directly without slip.Type: GrantFiled: October 7, 1994Date of Patent: March 5, 1996Assignee: Hitachi, Ltd.Inventors: Toshimichi Minowa, Yoshishige Ohyama, Hiroshi Kimura, Naoyuki Ozaki, Takashi Shiraishi, Junichi Ishii, Masahiko Ibamoto, Hiroatsu Tokuda
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Patent number: 5373448Abstract: A knock detection device being provided with a plurality of digital filter units, each is designed to cover respective characteristic resonance vibration frequency components inherent to resonance vibration modes due to knocking and including first, second and third digital filters, the first digital filter being tuned to the center frequency of the characteristic resonance vibration frequency component, the second digital filter being tuned to a neighboring lower frequency and the third digital filter being tuned to a neighboring higher frequency.Type: GrantFiled: July 16, 1992Date of Patent: December 13, 1994Assignee: Hitachi, Ltd.Inventors: Kozo Katogi, Takanobu Ichihara, Hiroatsu Tokuda
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Patent number: 5367906Abstract: An exothermic resistor for use in a hot wire air flow meter, having a wire (2) in the form of a coil made of a metal, a pair of lead wires (3) connected to connections (21) formed at the opposite ends of the coil, and a support member (4) which integrally supports the connections as well as the coil located between the connections. An example of the support member is in the form of a tubular cylinder closed at its both ends. The support member is formed from glass only or formed of a layer of a glass-ceramic-composite material. The hot wire air flow meter is designed to be easely mass-produced and to have improved transient response characteristics with respect to abrupt changes in the air flow rate.Type: GrantFiled: November 15, 1993Date of Patent: November 29, 1994Assignee: Hitachi, Ltd.Inventors: Shigeo Tsuruoka, Ken Takahashi, Tadahiko Miyoshi, Hiroatsu Tokuda
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Patent number: 5230316Abstract: A method and apparatus of detecting knocking in an internal combustion engine having a crankshaft uses a knock detecting sensor to detect vibration caused by knocking. The signals from the knock detecting sensor are detected between a first and a second moment of time (i.e. a measurement window) and at least one of the first and second moments of time are independently varied in dependence upon a vibration spectrum of frequencies to be detected. In a preferred embodiment a plurality of frequency spectra, each having a different first and second moment of time, are each separately analyzed for determining knock intensity. The moments of time are represented by first and second angles of the crankshaft. A plurality of measurement windows are advantageously used to determine the level of knocking and if the level exceeds a predetermined level the ignition timing for the engine is retarded.Type: GrantFiled: April 24, 1991Date of Patent: July 27, 1993Assignee: Hitachi, Ltd.Inventors: Takanobu Ichihara, Kozo Katogi, Hiroatsu Tokuda
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Patent number: 5186146Abstract: A combustion/evaluation apparatus having a sampling member for sampling light emitted from flame in an internal combustion engine, optical fibers for separating the light sampled by the sampling member into at least two lights, optical filters for selectively transmitting lights having different wavelengths by being provided in optical paths for the separated lights, photoelectric conversion elements for respectively converting optical signals transmitted through the optical filters into electrical signals, and a calculation/evaluation unit for calculating an air ratio and a temperature for evaluation of the combustion condition of the flame by using a ratio of outputs from the photoelectric conversion elements, and for evaluating the combustion condition on the basis of the air ratio and the temperature.Type: GrantFiled: April 6, 1992Date of Patent: February 16, 1993Assignee: Hitachi, Ltd.Inventors: Kenichi Sohma, Tugihiro Yukitake, Shigeru Azuhata, Norio Arashi, Hiroatsu Tokuda
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Patent number: 5036702Abstract: A hot wire type air flow meter employing a hot wire temperature dependent resistor having a heat generating portion and a non-heat generating portion comprising a feedback control circuit controlling the hot wire temperature dependent resistor temperature constant which includes a phase shift circuit for inducing a sufficient phase delay in feedback signals thereby compensating a second stage delay in output signals of the air flow meter caused by the thermal inertia of the non-heat generating portion and enhancing response characteristic of the air flow meter.Type: GrantFiled: September 22, 1988Date of Patent: August 6, 1991Assignees: Hitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.Inventors: Masuo Akamatsu, Hiroatsu Tokuda, Izumi Watanabe, Hiroshi Yoneda
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Patent number: RE34403Abstract: A compact hot-wire type air flow meter for an internal combustion engine with a high measuring accuracy is provided with a primary flow path forming an intake air passage and an auxiliary flow path incorporating therein a hot-wire element for measuring the intake air. The auxiliary flow path is defined by a flow path in an axial direction of the primary flow path and a flow path in a radial direction of the primary flow path.Type: GrantFiled: December 19, 1991Date of Patent: October 12, 1993Assignee: Hitachi, Ltd.Inventors: Nobukatsu Arai, Yoshihito Sekine, Tadao Osawa, Hiroatsu Tokuda, Toshifumi Usui, Mitsukuni Tsutsui