Patents by Inventor Ryuji Kurihara
Ryuji Kurihara 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: 11444551Abstract: An object of the present invention is to improve availability when a power is lost. In a power conversion device 1, a gate drive power supply circuit 50 can supply a gate drive power within a predetermined normal voltage range. A backup power supply circuit 70 supplies the gate drive power to a lower arm gate circuit 40 when a voltage of the gate drive power applied from the gate drive power supply circuit 50 to the lower arm gate circuit 40 falls below a normal voltage range. When the gate drive power is supplied from the backup power supply circuit 70, the lower arm gate circuit 40 drives a lower arm switching circuit 22 in a short state in which all switching elements of the lower arm switching circuit 22 are turned on.Type: GrantFiled: December 26, 2018Date of Patent: September 13, 2022Assignee: HITACHI ASTEMO, LTD.Inventors: Takashi Ogura, Ryuji Kurihara, Ryoichi Inada
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Patent number: 11303223Abstract: Provided is a detector. The detector includes: one or more detection diodes configured to detect a change in an environment of a detection target; a Y capacitor including a plurality of capacitors separately disposed between one end of the detection diodes and a GND and between the other end of the detection diodes and the GND; and a rectifier circuit disposed at least between one end of the detection diodes and the GND or between the other end of the detection diodes and the GND, connected in series with the Y capacitor, and configured to transmit a common-mode current accompanying noise induced in the detection diodes to the GND and cut off a normal-mode loop current that flows between the plurality of capacitors and the detection diodes.Type: GrantFiled: June 1, 2018Date of Patent: April 12, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Isao Hoda, Jia Li, Hiroki Funato, Ryuji Kurihara
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Publication number: 20210336558Abstract: Provided is a detector. The detector includes: one or more detection diodes configured to detect a change in an environment of a detection target; a Y capacitor including a plurality of capacitors separately disposed between one end of the detection diodes and a GND and between the other end of the detection diodes and the GND; and a rectifier circuit disposed at least between one end of the detection diodes and the GND or between the other end of the detection diodes and the GND, connected in series with the Y capacitor, and configured to transmit a common-mode current accompanying noise induced in the detection diodes to the GND and cut off a normal-mode loop current that flows between the plurality of capacitors and the detection diodes.Type: ApplicationFiled: June 1, 2018Publication date: October 28, 2021Inventors: Isao HODA, Jia LI, Hiroki FUNATO, Ryuji KURIHARA
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Patent number: 11011996Abstract: An object of the present invention is to improve the reliability of a power converter against electromagnetic noise.Type: GrantFiled: January 29, 2018Date of Patent: May 18, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Akira Ishii, Hiroyuki Saito, Yutaka Okubo, Ryuji Kurihara, Yuji Sobu
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Publication number: 20210050799Abstract: An object of the present invention is to improve availability when a power is lost. In a power conversion device 1, a gate drive power supply circuit 50 can supply a gate drive power within a predetermined normal voltage range. A backup power supply circuit 70 supplies the gate drive power to a lower arm gate circuit 40 when a voltage of the gate drive power applied from the gate drive power supply circuit 50 to the lower arm gate circuit 40 falls below a normal voltage range. When the gate drive power is supplied from the backup power supply circuit 70, the lower arm gate circuit 40 drives a lower arm switching circuit 22 in a short state in which all switching elements of the lower arm switching circuit 22 are turned on.Type: ApplicationFiled: December 26, 2018Publication date: February 18, 2021Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Takashi OGURA, Ryuji KURIHARA, Ryoichi INADA
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Publication number: 20190386577Abstract: An object of the present invention is to improve the reliability of a power converter against electromagnetic noise.Type: ApplicationFiled: January 29, 2018Publication date: December 19, 2019Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Akira ISHII, Hiroyuki SAITO, Yutaka OKUBO, Ryuji KURIHARA, Yuji SOBU
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Patent number: 8593582Abstract: An active matrix substrate has a structure that prevents a drain extraction line from breaking without a plurality of active elements such as thin film transistor elements, metal-insulator-metal elements, MOS transistor elements, diodes, and varistors being disposed, and is suited for use in a large-size liquid crystal television or a like liquid crystal display device equipped with a large-size liquid crystal display panel. The active matrix substrate includes an active element connected, via a drain extraction line, to a storage capacitor upper electrode, wherein the drain extraction line has at least two routes.Type: GrantFiled: August 1, 2011Date of Patent: November 26, 2013Assignee: Sharp Kabushiki KaishaInventors: Ryuji Kurihara, Yuhko Hisada, Toshihide Tsubata, Masanori Takeuchi, Tomokazu Ohtsubo
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Patent number: 8153903Abstract: In a circuit board disposed in parallel to a fixing plane, a guard spacer (abutting member) is disposed on a multi-layer printed circuit board on the side of the fixing plane to suppress deformation of the multi-layer printed circuit board to prevent short circuit if an impact is applied to the circuit board. The guard spacer may be a dummy electronic component or a plate member. An image display using the circuit board is also disclosed.Type: GrantFiled: December 5, 2008Date of Patent: April 10, 2012Assignee: Hitachi, Ltd.Inventors: Akihiko Kanouda, Ryuji Kurihara, Fusao Sakuramori, Takeshi Mochizuki, Yoshihiko Sugawara, Masami Joraku
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Publication number: 20110279764Abstract: An active matrix substrate has a structure that prevents a drain extraction line from breaking without a plurality of active elements such as thin film transistor elements, metal-insulator-metal elements, MOS transistor elements, diodes, and varistors being disposed, and is suited for use in a large-size liquid crystal television or a like liquid crystal display device equipped with a large-size liquid crystal display panel. The active matrix substrate includes an active element connected, via a drain extraction line, to a storage capacitor upper electrode, wherein the drain extraction line has at least two routes.Type: ApplicationFiled: August 1, 2011Publication date: November 17, 2011Applicant: SHARP KABUSHIKI KAISHAInventors: Ryuji KURIHARA, Yuhko HISADA, Toshihide TSUBATA, Masanori TAKEUCHI, Tomokazu OHTSUBO
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Patent number: 8031282Abstract: An active matrix substrate has a structure that prevents a drain extraction line from breaking without a plurality of active elements such as thin film transistor elements, metal-insulator-metal elements, MOS transistor elements, diodes, and varistors being disposed, and is suited for use in a large-size liquid crystal television or a like liquid crystal display device equipped with a large-size liquid crystal display panel. The active matrix substrate includes an active element connected, via a drain extraction line, to a storage capacitor upper electrode, wherein the drain extraction line has at least two routes.Type: GrantFiled: April 4, 2008Date of Patent: October 4, 2011Assignee: Sharp Kabushiki KaishaInventors: Ryuji Kurihara, Yuhko Hisada, Toshihide Tsubata, Masanori Takeuchi, Tomokazu Ohtsubo
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Patent number: 7695160Abstract: A projector light source which facilitates molding of a reflector for obtaining a complicated reflecting surface and provides an improved cooling efficiency, which is characterized by molding the reflector of the light source using heat resistant plastic mixed with a high heat conductive material, whereby a molding accuracy is drastically improved compared to a heat resistant glass reflector, and a highly efficient light source is implemented by increasing a degree of design freedom using a high-order non-spherical reflecting surface. Furthermore, heat conductivity is increased by the use of a high heat conductive material for the reflector and heat dissipation to an outside is facilitated.Type: GrantFiled: May 29, 2007Date of Patent: April 13, 2010Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Ryuji Kurihara, Kobuo Masuoka
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Patent number: 7586563Abstract: The present invention is a color filter substrate comprising: a non-laminated part in which a colored layer and/or a transparent layer are arranged in a plane; and a laminated part in which parts of the colored layer and/or the transparent layer are laminated as two or more layers on a substrate, (1) a film thickness of a layer constituting the laminated part is not less than 90% and not more than 110% to a film thickness of a corresponding layer of the non-laminated part and/or (2) the colored layer and/or the transparent layer are formed using a dry film having a solid-phase resist layer having penetration amount in a penetration hardness test at 120° C. of not more than 0.5 ?m.Type: GrantFiled: July 19, 2005Date of Patent: September 8, 2009Assignee: Sharp Kabushiki KaishaInventors: Tsuyoshi Tokuda, Toshifumi Yagi, Toshihide Tsubata, Yoshinori Kinai, Ryuji Kurihara
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Publication number: 20090145637Abstract: In a circuit board disposed in parallel to a fixing plane, a guard spacer (abutting member) is disposed on a multi-layer printed circuit board on the side of the fixing plane to suppress deformation of the multi-layer printed circuit board to prevent short circuit if an impact is applied to the circuit board. The guard spacer may be a dummy electronic component or a plate member. An image display using the circuit board is also disclosed.Type: ApplicationFiled: December 5, 2008Publication date: June 11, 2009Inventors: Akihiko KANOUDA, Ryuji Kurihara, Fusao Sakuramori, Takeshi Mochizuki, Yoshihiko Sugawara, Masami Joraku
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Publication number: 20080192161Abstract: An active matrix substrate has a structure that prevents a drain extraction line from breaking without a plurality of active elements such as thin film transistor elements, metal-insulator-metal elements, MOS transistor elements, diodes, and varistors being disposed, and is suited for use in a large-size liquid crystal television or a like liquid crystal display device equipped with a large-size liquid crystal display panel. The active matrix substrate includes an active element connected, via a drain extraction line, to a storage capacitor upper electrode, wherein the drain extraction line has at least two routes.Type: ApplicationFiled: April 4, 2008Publication date: August 14, 2008Applicant: SHARP KABUSHIKI KAISHAInventors: Ryuji KURIHARA, Yuhko HISADA, Toshihide TSUBATA, Masanori TAKEUCHI, Tomokazu OHTSUBO
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Patent number: 7375773Abstract: The active matrix substrate of the present invention is an active matrix substrate in which a drain extraction line can be prevented from breaking without a plurality of active elements such as TFT (thin film transistor) elements, MIM (metal-insulator-metal) elements, MOS transistor elements, diodes, and varistors being disposed, and is suited for use in large-size liquid crystal television or a like liquid crystal display device equipped with a large-size liquid crystal display panel. The active matrix substrate of the present invention is an active matrix substrate comprising an active element connected, via a drain extraction line, to a storage capacitor upper electrode, wherein the drain extraction line has at least two routes.Type: GrantFiled: January 25, 2005Date of Patent: May 20, 2008Assignee: Sharp Kabushiki KaishaInventors: Ryuji Kurihara, Yuhko Hisada, Toshihide Tsubata, Masanori Takeuchi, Tomokazu Ohtsubo
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Patent number: 7357537Abstract: Provided is a projector light source which can effectively project a light beam having a sufficient volume from a lamp as a light source, and which is highly accurate and is excellent in workability. The projector light source comprising an arc tube for emitting a light beam; and a concave reflector including a hold part for holding the arc tube, and having a concave reflection surface for reflecting the light beam from the arc tube so that the light beam outgoes through an opening of the reflector, the concave reflector comprising a first reflector located in the vicinity of the hold part for holding the light emitting tube, and second reflector located in a part other than the hold part, and made of a material different from that of the first reflector. Further, the first reflector is made of heat-resistant glass, and the second reflector is made a material containing a heat-resistant organic material having a thermal deformation temperature which is lower than that of the heat-resistant glass.Type: GrantFiled: February 4, 2005Date of Patent: April 15, 2008Assignee: Hitachi, Ltd.Inventors: Nobuo Masuoka, Koji Hirata, Yoshie Kodera, Ryuji Kurihara
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Patent number: 7316487Abstract: A projector light source which facilitates molding of a reflector for obtaining a complicated reflecting surface and provides an improved cooling efficiency, which is characterized by molding the reflector of the light source using heat resistant plastic mixed with a high heat conductive material, whereby a molding accuracy is drastically improved compared to a heat resistant glass reflector, and a highly efficient light source is implemented by increasing a degree of design freedom using a high-order non-spherical reflecting surface. Furthermore, heat conductivity is increased by the use of a high heat conductive material for the reflector and heat dissipation to an outside is facilitated.Type: GrantFiled: March 20, 2002Date of Patent: January 8, 2008Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Ryuji Kurihara, Nobuo Masuoka
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Publication number: 20070236669Abstract: A projector light source which facilitates molding of a reflector for obtaining a complicated reflecting surface and provides an improved cooling efficiency, which is characterized by molding the reflector of the light source using heat resistant plastic mixed with a high heat conductive material, whereby a molding accuracy is drastically improved compared to a heat resistant glass reflector, and a highly efficient light source is implemented by increasing a degree of design freedom using a high-order non-spherical reflecting surface. Furthermore, heat conductivity is increased by the use of a high heat conductive material for the reflector and heat dissipation to an outside is facilitated.Type: ApplicationFiled: May 29, 2007Publication date: October 11, 2007Applicant: Hitachi, Ltd.Inventors: Koji Hirata, Ryuji Kurihara, Nobuo Masuoka
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Patent number: 7274157Abstract: In a lamp operation controller and a method thereof, for obtaining a stable light emission, simply and certainly, without necessity of detection of a parameter accompanying discharge, the lamp operation controller, for operating a discharge lamp having a pair of electrodes, which are disposed at both ends of a light emission tube to have a predetermined distance therebetween, converts electric power of an electric power source 1, through an inverter, into alternating voltage and alternating current, changing the polarity thereof continuously and alternately, so as to produce operating current, and apply that across the pair of the electrodes of the discharge lamp, thereby letting the lamp to emit a light.Type: GrantFiled: July 12, 2005Date of Patent: September 25, 2007Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Ryuji Kurihara
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Publication number: 20060017872Abstract: The present invention is a color filter substrate comprising: a non-laminated part in which a colored layer and/or a transparent layer are arranged in a plane; and a laminated part in which parts of the colored layer and/or the transparent layer are laminated as two or more layers on a substrate, (1) a film thickness of a layer constituting the laminated part is not less than 90% and not more than 110% to a film thickness of a corresponding layer of the non-laminated part and/or (2) the colored layer and/or the transparent layer are formed using a dry film having a solid-phase resist layer having penetration amount in a penetration hardness test at 120° C. of not more than 0.5 ?m.Type: ApplicationFiled: July 19, 2005Publication date: January 26, 2006Applicant: Sharp Kabushiki KaishaInventors: Tsuyoshi Tokuda, Toshifumi Yagi, Toshihide Tsubata, Yoshinori Kinai, Ryuji Kurihara