Patents by Inventor Yuuki Ohta
Yuuki Ohta 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: 9546577Abstract: A valve timing control apparatus includes a driving-side rotating member, a driven-side rotating member, a fluid pressure chamber defined by the driving-side rotating member and the driven-side rotating member and divided into a retarded angle chamber and an advanced angle chamber by a parting portion, an angle detecting portion detecting a relative angle of the driven-side rotating member relative to the driving-side rotating member, a fluid control mechanism controlling a supply and a discharge of an operation fluid to and from the fluid pressure chamber, an acceleration operation quantity detecting mechanism detecting an acceleration operation quantity, and a control portion setting either a normal drive mode or an acceleration drive mode as a control mode relative to the fluid control mechanism based on the acceleration operation quantity, and controlling the fluid control mechanism so that the relative angle corresponds to a target angle determined based on the set control mode.Type: GrantFiled: February 22, 2011Date of Patent: January 17, 2017Assignee: AISIN SEIKI KABUSHIKI KAISHAInventors: Satoshi Kokubo, Masahiro Yoshida, Yuuki Ohta, Masaaki Kaneko
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Patent number: 9133736Abstract: A valve timing adjusting system includes a displacement mechanism unit that displaces a camshaft rotational phase relative to a crankshaft, a locking mechanism unit that locks the rotational phase, and a control unit that controls operations of a hydraulic control valve. The control unit includes a property obtainment unit that obtains property information regarding hydraulic properties, and a lock release process completes locking release by supplying oil pressure to the locking mechanism unit for moving the rotational phase from an intermediate locked phase toward one of a retard/advance position, and then supplying oil pressure to the locking mechanism unit for moving the rotational phase toward the other of the retard/advance position; the rotational phase stands by at a predetermined position of the one of the retard/advance position past the intermediate locked phase during the lock release process, until a standby time has elapsed.Type: GrantFiled: July 5, 2012Date of Patent: September 15, 2015Assignee: AISIN SEIKI KABUSHIKI KAISHAInventors: Yuji Kakuda, Satoshi Kokubo, Kenji Ikeda, Masaki Kobayashi, Yuuki Ohta
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Patent number: 9057292Abstract: Provided is a timing adjustment system having improved control for achieving a target rotational phase. The valve timing adjustment system includes a displacement mechanism unit that displaces a rotational phase of a camshaft relative to a crankshaft of an internal combustion engine; a locking mechanism unit that locks the rotational phase at an intermediate locked phase positioned within a displacement range of the rotational phase; a hydraulic pathway that hydraulically drives the displacement mechanism unit and the locking mechanism unit; and a control unit including a control system that controls operations of the hydraulic control valve. The control unit changes a temporal responsiveness of the control system based on a displacement force that displaces the rotational phase.Type: GrantFiled: July 5, 2012Date of Patent: June 16, 2015Assignee: AISIN SEIKI KABUSHIKI KAISHAInventors: Satoshi Kokubo, Yuji Kakuda, Kenji Ikeda, Yuuki Ohta, Masaki Kobayashi
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Patent number: 8983744Abstract: An automatic shift apparatus includes a rotation shaft, a dog clutch gear shift mechanism, and a control unit. The control unit controls first moving speed to be faster than second moving speed on moving a sleeve in an engaged state engaged with one of a first clutch ring and a second clutch ring to a neutral position defined at a position between the first clutch ring and the second clutch ring where the first moving speed is a speed of moving the sleeve in the engaged state to a target position defined between the neutral position and the mentioned one of the first clutch ring and the second clutch ring the sleeve is engaged with and where the second moving speed is a speed of moving the sleeve from the target position to the neutral position.Type: GrantFiled: January 9, 2014Date of Patent: March 17, 2015Assignee: Aisin Seiki Kabushiki KaishaInventors: Masahiko Komura, Yuuki Ohta, Kyosuke Mori
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Patent number: 8955480Abstract: Provided is a timing adjustment system having improved control for achieving a target rotational phase. The valve timing adjustment system includes a displacement mechanism unit that displaces a rotational phase of a camshaft relative to a crankshaft of an internal combustion engine; a locking mechanism unit that locks the rotational phase at an intermediate locked phase positioned within a displacement range of the rotational phase; a hydraulic pathway that hydraulically drives the displacement mechanism unit and the locking mechanism unit; and a control unit including a control system that controls operations of the hydraulic control valve. The control unit changes a temporal responsiveness of the control system based on a displacement force that displaces the rotational phase.Type: GrantFiled: July 5, 2012Date of Patent: February 17, 2015Assignee: Aisin Seiki Kabushiki KaishaInventors: Satoshi Kokubo, Yuji Kakuda, Kenji Ikeda, Yuuki Ohta, Masaki Kobayashi
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Patent number: 8952880Abstract: A display panel drive circuit includes a shift register constructed of unit circuits connected in stages. The unit circuits generate signal line selection signals, respectively, which signal line selection signals are made active for a respective certain period of time to form a respective pulse, and the pulses are outputted successively from respective unit circuits in order of ordinal number starting from a first stage until an end stage. In at least one embodiment, each of the unit circuits receive (i) clock signals generated based on a sync signal received from outside of the display panel drive circuit, (ii) a start pulse signal generated based on the sync signal, or a signal line selection signal generated in a stage different from its own stage, and (iii) a clear signal. The clear signal is made active in a case where anomalousness is included in the sync signal, and no pulse is outputted from the shift register until a subsequent vertical scanning period starts.Type: GrantFiled: December 17, 2008Date of Patent: February 10, 2015Assignee: Sharp Kabushiki KaishaInventors: Takayuki Mizunaga, Hideki Morii, Akihisa Iwamoto, Masahiro Hirokane, Yuuki Ohta
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Patent number: 8914209Abstract: An automatic shift apparatus including a rotation shaft, a dog clutch gear shift mechanism, and a control unit. The control unit supplies a predetermined electric current to a shaft moving apparatus to move a sleeve in an engaged state engaged with one of a first clutch ring and a second clutch ring and supplies a braking electric current smaller than the predetermined electric current to the shaft moving apparatus to exert a braking force on the sleeve, the braking force directed in the opposite direction relative to a direction of movement of the sleeve, before a spline of the sleeve disengages from a first dog clutch portion or a second dog clutch portion of the mentioned one of the first clutch ring and the second clutch ring.Type: GrantFiled: January 9, 2014Date of Patent: December 16, 2014Assignee: Aisin Seiki Kabushiki KaishaInventors: Kyosuke Mori, Yuuki Ohta, Masahiko Komura, Toshiyuki Morio, Shotaro Takahashi
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Publication number: 20140216377Abstract: Provided is a valve timing adjustment system having improved control for achieving a target rotational phase. The valve timing adjustment system includes: a displacement mechanism unit that displaces a rotational phase of a camshaft relative to a crankshaft of an internal combustion engine; a locking mechanism unit that locks the rotational phase at an intermediate locked phase positioned within a displacement range of the rotational phase; a hydraulic pathway that hydraulically drives the displacement mechanism unit and the locking mechanism unit; and a control unit including a control system that controls operations of the hydraulic control valve. The control unit changes a temporal responsiveness of the control system based on a displacement force that displaces the rotational phase.Type: ApplicationFiled: July 5, 2012Publication date: August 7, 2014Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Satoshi Kokubo, Yuji Kakuda, Kenji Ikeda, Yuuki Ohta, Masaki Kobayashi
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Publication number: 20140214291Abstract: An automatic shift apparatus includes a rotation shaft, a dog clutch gear shift mechanism, and a control unit. The control unit controls first moving speed to be faster than second moving speed on moving a sleeve in an engaged state engaged with one of a first clutch ring and a second clutch ring to a neutral position defined at a position between the first clutch ring and the second clutch ring where the first moving speed is a speed of moving the sleeve in the engaged state to a target position defined between the neutral position and the mentioned one of the first clutch ring and the second clutch ring the sleeve is engaged with and where the second moving speed is a speed of moving the sleeve from the target position to the neutral position.Type: ApplicationFiled: January 9, 2014Publication date: July 31, 2014Applicant: Aisin Seiki Kabushiki KaishaInventors: Masahiko KOMURA, Yuuki OHTA, Kyosuke Mori
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Publication number: 20140214294Abstract: An automatic shift apparatus including a rotation shaft, a dog clutch gear shift mechanism, and a control unit.Type: ApplicationFiled: January 9, 2014Publication date: July 31, 2014Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Kyosuke MORI, YUUKI OHTA, MASAHIKO KOMURA, TOSHIYUKI MORIO, SHOTARO TAKAHASHI
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Patent number: 8749469Abstract: A display device, in at least one embodiment, includes: a gate driver including a plurality of shift register stages each provided so as to correspond to each row, the gate driver outputting a gate signal for turning on switching elements in the each row; and a source driver outputting a data signal in accordance with an image to be displayed. For a row (first row) located at an outermost position from which scanning by use of the gate signal starts, a dummy line is provided. The dummy line is driven by a gate start pulse inputted into a shift register in the first row.Type: GrantFiled: August 28, 2008Date of Patent: June 10, 2014Assignee: Sharp Kabushiki KaishaInventors: Akihisa Iwamoto, Hideki Morii, Takayuki Mizunaga, Masahiro Hirokane, Yuuki Ohta
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Publication number: 20140150744Abstract: A valve timing adjusting system includes a displacement mechanism unit that displaces a camshaft rotational phase relative to a crankshaft, a locking mechanism unit that locks the rotational phase, and a control unit that controls operations of a hydraulic control valve. The control unit includes a property obtainment unit that obtains property information regarding hydraulic properties, and a lock release process completes locking release by supplying oil pressure to the locking mechanism unit for moving the rotational phase from an intermediate locked phase toward one of a retard/advance position, and then supplying oil pressure to the locking mechanism unit for moving the rotational phase toward the other of the retard/advance position; the rotational phase stands by at a predetermined position of the one of the retard/advance position past the intermediate locked phase during the lock release process, until a standby time has elapsed.Type: ApplicationFiled: July 5, 2012Publication date: June 5, 2014Applicant: AISIN SEIKI KABUSHIKI KAISHAInventors: Yuji Kakuda, Satoshi Kokubo, Kenji Ikeda, Masaki Kobayashi, Yuuki Ohta
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Publication number: 20130027104Abstract: An object of the present invention is to provide a level shift IC with a reduced number of input signals over the conventional case. A level shift IC includes an amplitude converting unit including four level shifters; and a different-phase signal generating unit at a stage previous to the amplitude converting unit, including delay circuits. The different-phase signal generating unit generates, by the delay circuits, first and second delayed input signals from first and second input signals of different phases. Therefore, four input signals of different phases are obtained, and the amplitude converting unit increases the amplitudes of the input signals by the amplitude converting unit and thereby generates first to fourth output signals with different phases and increased amplitudes.Type: ApplicationFiled: January 26, 2011Publication date: January 31, 2013Applicant: SHARP KABUSHIKI KAISHAInventors: Yuuki Ohta, Hideki Morii, Akihisa Iwamoto, Takayuki Mizunaga
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Publication number: 20120218245Abstract: A liquid crystal display device includes a monolithic gate driver capable of quickly eliminating residual charges within pixel formation portions when the power-supply is turned off. Each of bistable circuits that constitute a shift register within a gate driver is provided with a thin-film transistor having a drain terminal connected to a gate bus line, a source terminal connected to a reference potential line for transmitting a reference potential, and a gate terminal to which a clock signal for operating the shift register is supplied. When the external supply of power-supply voltage is cut off, the clock signal is set to high level to turn the thin-film transistor to the ON state, and the level of the reference potential is increased from a gate-OFF potential to a gate-ON potential.Type: ApplicationFiled: August 27, 2010Publication date: August 30, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Hideki Morii, Akihisa Iwamoto, Takayuki Mizunaga, Yuuki Ohta
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Publication number: 20120120044Abstract: Provided is a liquid crystal display device performing a precharge and having a function of switching an order for selecting scanning lines, in which such as flicker and burn-in can be prevented from being produced. A scanning line drive circuit selects scanning lines either in ascending order or in descending order based on an order of arrangement according to a shift direction signal, and causes selection periods of the scanning lines to be partially overlapped for a precharge. A data line drive circuit applies voltages of different polarities to data lines by frame and by data line. A common voltage generating circuit generates two types of voltages whose levels are independently adjustable, selects one of the two voltages according to a scan selection signal and applies the selected voltage to a common electrode of a liquid crystal panel. As the common voltage generating circuit, a D/A converter may be used.Type: ApplicationFiled: January 27, 2010Publication date: May 17, 2012Applicant: SHARP KABUSHIKI KAISHAInventors: Takayuki Mizunaga, Hideki Morii, Akihisa Iwamoto, Yuuki Ohta, Kei Ikuta
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Publication number: 20110232595Abstract: A valve timing control apparatus includes a driving-side rotating member, a driven-side rotating member, a fluid pressure chamber defined by the driving-side rotating member and the driven-side rotating member and divided into a retarded angle chamber and an advanced angle chamber by a parting portion, an angle detecting portion detecting a relative angle of the driven-side rotating member relative to the driving-side rotating member, a fluid control mechanism controlling a supply and a discharge of an operation fluid to and from the fluid pressure chamber, an acceleration operation quantity detecting mechanism detecting an acceleration operation quantity, and a control portion setting either a normal drive mode or an acceleration drive mode as a control mode relative to the fluid control mechanism based on the acceleration operation quantity, and controlling the fluid control mechanism so that the relative angle corresponds to a target angle determined based on the set control mode.Type: ApplicationFiled: February 22, 2011Publication date: September 29, 2011Applicant: Aisin Seiki Kabushiki KaishaInventors: Satoshi KOKUBO, Masahiro Yoshida, Yuuki Ohta, Masaaki Kaneko
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Publication number: 20110234565Abstract: In at least one embodiment, under a non-load condition of a first supply line for a first clock signal and a second supply line for a second clock signal, a fall time of a clock pulse of the first clock signal, which is supplied to the first supply line, is longer than that of the second clock signal, which is supplied to the second supply line.Type: ApplicationFiled: August 7, 2009Publication date: September 29, 2011Applicant: Sharp Kabushiki KaishaInventors: Hideki Morii, Akihisa Iwamoto, Takayuki Mizunaga, Yuuki Ohta, Kei Ikuta
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Publication number: 20110134090Abstract: A control section prepares a control signal and supplies the control signal to a control terminal of a first switching element, the control signal causing the first switching element to turn on in accordance with a non-active voltage level of a storage node and an active voltage level of a second clock signal which active voltage level is obtained in a period in which the second clock signal is active.Type: ApplicationFiled: May 27, 2009Publication date: June 9, 2011Applicant: Sharp Kabushiki KaishaInventors: Akihisa Iwamoto, Takayuki Mizunaga, Hideki Morii, Yuuki Ohta, Kei Ikuta
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Patent number: 7911559Abstract: An illuminating device achieves higher brightness by improving the utilization efficiency of light from a light source in an illuminating device for emitting plane-shaped light. The backlight device includes a light guide member, and LED units facing side surfaces of the light guide member, and propagates light that is emitted by the LEDs and made incident to the side surfaces in the light guide member so as to emit plane-shaped light from a first main surface of the light guide member. The backlight device includes an insulating reflective member placed outside a second main surface of the light guide member facing the first main surface, and a metal reflective sheet laminated on the insulating reflective sheet on the side opposite to the light guide member.Type: GrantFiled: July 19, 2006Date of Patent: March 22, 2011Assignee: Sharp Kabushiki KaishaInventors: Yuuki Ohta, Tetsuya Hamada, Noriyuki Ohashi
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Publication number: 20110018845Abstract: A display panel drive circuit includes a shift register constructed of unit circuits connected in stages. The unit circuits generate signal line selection signals, respectively, which signal line selection signals are made active for a respective certain period of time to form a respective pulse, and the pulses are outputted successively from respective unit circuits in order of ordinal number starting from a first stage until an end stage. In at least one embodiment, each of the unit circuits receive (i) clock signals generated based on a sync signal received from outside of the display panel drive circuit, (ii) a start pulse signal generated based on the sync signal, or a signal line selection signal generated in a stage different from its own stage, and (iii) a clear signal. The clear signal is made active in a case where anomalousness is included in the sync signal, and no pulse is outputted from the shift register until a subsequent vertical scanning period starts.Type: ApplicationFiled: December 17, 2008Publication date: January 27, 2011Inventors: Takayuki Mizunaga, Hideki Morii, Akihisa Iwamoto, Masahiro Hirokane, Yuuki Ohta