Patents by Inventor Koichiro Oku
Koichiro Oku 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: 8376612Abstract: A mobile X-ray apparatus including a main body portion, a mobile dolly on which the main body portion is mounted, a support pole that is erectly provided on the mobile dolly, an X-ray generator supported on the support pole, and an image reading device for reading image information from an imaging plate in which X-ray image information is stored, and further including detecting means for detecting whether the mobile dolly is being moved, and reading control means for prohibiting reading of the image reading device when it is detected by the detecting means that the mobile dolly is being moved.Type: GrantFiled: February 19, 2009Date of Patent: February 19, 2013Assignee: Hitachi Medical CorporationInventors: Tomokazu Takae, Yuji Oda, Koichiro Oku, Shinya Kitamura
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Patent number: 8264280Abstract: Detection accuracy of a short circuit state in a load driving circuit is improved thereby operation efficiency of a motor may be enhanced. A gate control circuit 25 turns off NMOS transistors Q1 and Q4, turns on an NMOS transistor Q3, and turns on and off an NMOS transistor Q2 intermittently so as to control rotation of a motor 10. A detection circuit 30a detects a voltage Va at a connection node a between the NMOS transistor Q2 and the motor 10 a predetermined time after the NMOS transistor Q2 is turned on. A control circuit 20 turns off the NMOS transistor Q2 so as to cut off a current from a power supply to the motor 10 if the voltage Va at the connection node a is within a range in which the motor 10 is determined to be short-circuited.Type: GrantFiled: July 7, 2009Date of Patent: September 11, 2012Assignee: Renesas Electronics CorporationInventor: Koichiro Oku
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Publication number: 20100329427Abstract: A mobile X-ray apparatus including a main body portion, a mobile dolly on which the main body portion is mounted, a support pole that is erectly provided on the mobile dolly, an X-ray generator supported on the support pole, and an image reading device for reading image information from an imaging plate in which X-ray image information is stored, and further including detecting means for detecting whether the mobile dolly is being moved, and reading control means for prohibiting reading of the image reading device when it is detected by the detecting means that the mobile dolly is being moved.Type: ApplicationFiled: February 19, 2009Publication date: December 30, 2010Applicant: HITACHI MEDICAL CORPORATIONInventors: Tomokazu Takae, Yuji Oda, Koichiro Oku, Shinya Kitamura
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Publication number: 20100014196Abstract: Detection accuracy of a short circuit state in a load driving circuit is improved thereby operation efficiency of a motor may be enhanced. A gate control circuit 25 turns off NMOS transistors Q1 and Q4, turns on an NMOS transistor Q3, and turns on and off an NMOS transistor Q2 intermittently so as to control rotation of a motor 10. A detection circuit 30a detects a voltage Va at a connection node a between the NMOS transistor Q2 and the motor 10 a predetermined time after the NMOS transistor Q2 is turned on. A control circuit 20 turns off the NMOS transistor Q2 so as to cut off a current from a power supply to the motor 10 if the voltage Va at the connection node a is within a range in which the motor 10 is determined to be short-circuited.Type: ApplicationFiled: July 7, 2009Publication date: January 21, 2010Applicant: NEC ELECTRONICS CORPORATIONInventor: Koichiro Oku
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Patent number: 6518723Abstract: An H-bridge motor driving circuit has, between a PWM comparator and a control circuit, first and second frequency dividers for frequency-dividing, by 2, an AND gate, OR gate, and first and second and second inverters. During a first period, the first and second MOS transistors are turned on, and the second and third MOS transistors are turned off, caused a current to flow through a motor. During a next second period, the third and fourth MOS transistors are turned on, and the first and second MOS transistors are turned off, causing a regenerative current to flow through the motor. During a next third period, the MOS transistors are turned on and off in the same manner as during the first period, causing a current to flow through the motor. During a final fourth period, the first and second MOS transistors are turned on, and the third and fourth MOS transistors are turned off, caused a regenerative current to flow through the motor.Type: GrantFiled: July 17, 2001Date of Patent: February 11, 2003Assignee: NEC CorporationInventor: Koichiro Oku
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Patent number: 6433502Abstract: The spindle motor drive circuit includes a power source voltage varying device for varying a voltage applied to a motor by controlling a power source voltage, and a pulse width varying device for varying a pulse width by pulse width modulation.Type: GrantFiled: June 14, 2001Date of Patent: August 13, 2002Assignee: NEC CorporationInventor: Koichiro Oku
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Publication number: 20020005706Abstract: An H-bridge motor driving circuit has, between a PWM comparator and a control circuit, first and second frequency dividers for frequency-dividing, by 2, an AND gate, OR gate, and first and second inverters. During a first period, the first and second MOS transistors are turned on, and the second and third MOS transistors are turned off, causing a current to flow through a motor. During a next second period, the third and fourth MOS transistors are turned on, and the first and second MOS transistors are turned off, causing a regenerative current to flow through the motor. During a next third period, the MOS transistors are turned on and off in the same manner as during the first period, causing a current to flow through the motor. During a final fourth period, the first and second MOS transistors are turned on, and the third and fourth MOS transistors are turned off, causing a regenerative current to flow through the motor.Type: ApplicationFiled: July 17, 2001Publication date: January 17, 2002Applicant: NEC CorporationInventor: Koichiro Oku
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Publication number: 20010054874Abstract: The spindle motor drive circuit of the present invention comprises: a power source voltage varying device for varying a voltage applied to a motor by controlling a power source voltage; and a pulse width varying device for varying a pulse width by pulse width modulation.Type: ApplicationFiled: June 14, 2001Publication date: December 27, 2001Applicant: NEC CORPORATIONInventor: Koichiro Oku
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Patent number: 5828208Abstract: A voltage regulator has a pair of common terminals (101, 102) and a pair of rectifying diodes (103, 104) which are connected to the common terminals, respectively. The rectifying diodes supplies an input voltage which is supplied to one of the common terminals to a connecting point (105) of the rectifying diodes. Resistors (107, 108, 109, 110), a comparator (111), and a switch (112) selectively couple a dividing resistor (17) with one of the common terminals that is not supplied with the input voltage. A MOSFET (106) is connected to the common terminals so as to amplify an input voltage supplied to one of the common terminals and so as to provide an output voltage to the other terminal. A constant current source (14), a start up circuit (15), a reference voltage producing circuit (16), an error amplifier (19) control the MOSFET so that a reference voltage V.sub.REF produced by the reference voltage producing circuit is equal to a divided voltage V.sub.O produced by dividing resistor (17,18).Type: GrantFiled: July 25, 1997Date of Patent: October 27, 1998Assignee: NEC CorporationInventor: Koichiro Oku
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Patent number: D657875Type: GrantFiled: December 3, 2010Date of Patent: April 17, 2012Assignee: Hitachi Medical CorporationInventors: Kazuyuki Yanase, Atsushi Ninomiya, Masaru Yokoyama, Koichiro Oku, Shinya Kitamura
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Patent number: D917355Type: GrantFiled: March 20, 2018Date of Patent: April 27, 2021Assignee: NISSIN KOGYO CO., LTD.Inventors: Koichiro Oku, Hiroaki Tanaka
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Patent number: D929463Type: GrantFiled: April 3, 2020Date of Patent: August 31, 2021Assignee: NISSIN KOGYO CO., LTD.Inventor: Koichiro Oku
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Patent number: D974980Type: GrantFiled: April 15, 2021Date of Patent: January 10, 2023Assignee: HITACHI ASTEMO, LTD.Inventors: Koichiro Oku, Yuji Machida, Genichi Hatakoshi