Patents by Inventor Shinsuke Takagimoto

Shinsuke Takagimoto 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).

  • Publication number: 20190373690
    Abstract: A ground fault detection circuit includes an input portion, and a ground fault determination unit. The input portion inputs an anode voltage of a series connection unit constituted of a plurality of light emission elements. When an anode voltage of the series connection unit input by the input portion is lower than or equal to a predetermined value less than a product of an on-resistance of the short-circuit switch disposed in parallel to each of the light emission elements and current supplied to the series connection unit, the ground fault determination unit determines that a ground fault has occurred without the short-circuit switch in a ground fault path.
    Type: Application
    Filed: August 13, 2019
    Publication date: December 5, 2019
    Applicant: Rohm Co., Ltd.
    Inventors: Yoshiyuki Nakatani, Shinsuke Takagimoto
  • Patent number: 10426013
    Abstract: A ground fault detection circuit includes an input portion, and a ground fault determination unit. The input portion inputs an anode voltage of a series connection unit constituted of a plurality of light emission elements. When an anode voltage of the series connection unit input by the input portion is lower than or equal to a predetermined value less than a product of an on-resistance of the short-circuit switch disposed in parallel to each of the light emission elements and current supplied to the series connection unit, the ground fault determination unit determines that a ground fault has occurred without the short-circuit switch in a ground fault path.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: September 24, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Yoshiyuki Nakatani, Shinsuke Takagimoto
  • Patent number: 10390402
    Abstract: A light emitting drive device has an output voltage supply unit, and an emergency drive unit. The output voltage supply unit generates an output voltage from an input voltage on the basis of a control signal transmitted from a control unit, and supplies at least one light emitting element with the output voltage. In the cases where the emergency drive unit received a signal indicating abnormality of the control unit, the emergency drive unit lights the whole or a part of the at least one light emitting element irrespective of the control signal transmitted from the control unit.
    Type: Grant
    Filed: April 9, 2018
    Date of Patent: August 20, 2019
    Assignee: Rohm Co., Ltd.
    Inventor: Shinsuke Takagimoto
  • Patent number: 10360969
    Abstract: A light emitting element driving semiconductor integrated circuit constitutes at least a part of a light emitting element driving device arranged to drive a series connection unit including a plurality of light emitting elements. The light emitting element driving semiconductor integrated circuit includes a single-element short-circuit detection unit arranged to detect that one of the plurality of light emitting elements is short-circuited, and a control unit arranged to control a power element of the light emitting element driving device so that current supplied from the light emitting element driving device to the series connection unit is increased, when the single-element short-circuit detection circuit detects that one of the plurality of light emitting elements is short-circuited.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: July 23, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Shinsuke Takagimoto, Yoshiyuki Nakatani, Masaaki Nakayama
  • Publication number: 20180227996
    Abstract: A light emitting drive device has an output voltage supply unit, and an emergency drive unit. The output voltage supply unit generates an output voltage from an input voltage on the basis of a control signal transmitted from a control unit, and supplies at least one light emitting element with the output voltage. In the cases where the emergency drive unit received a signal indicating abnormality of the control unit, the emergency drive unit lights the whole or a part of the at least one light emitting element irrespective of the control signal transmitted from the control unit.
    Type: Application
    Filed: April 9, 2018
    Publication date: August 9, 2018
    Applicant: Rohm Co., Ltd.
    Inventor: Shinsuke Takagimoto
  • Patent number: 9992834
    Abstract: A light-emitting element driving device includes a reset signal generation unit that generates a reset signal in accordance with current flowing in a light-emitting element, a set signal generation unit that generates a set signal in accordance with the anode voltage of the light-emitting element, and an output voltage supply unit that generates an output voltage from an input voltage in accordance with the reset signal and the set signal, so as to supply the output voltage to the light-emitting element. The set signal generation unit includes a current generation unit that generates current according to the anode voltage of the light-emitting element, a charging unit that charges the current generated by the current generation unit, and a comparator that generates the set signal in accordance with a comparison result between a charging voltage of the charging unit and a reference voltage.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: June 5, 2018
    Assignee: Rohm Co., Ltd.
    Inventors: Shigenori Kawase, Shinsuke Takagimoto, Yoshiyuki Nakatani
  • Patent number: 9986611
    Abstract: A light emitting drive device has an output voltage supply unit, and an emergency drive unit. The output voltage supply unit generates an output voltage from an input voltage on the basis of a control signal transmitted from a control unit, and supplies at least one light emitting element with the output voltage. In the cases where the emergency drive unit received a signal indicating abnormality of the control unit, the emergency drive unit lights the whole or a part of the at least one light emitting element irrespective of the control signal transmitted from the control unit.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: May 29, 2018
    Assignee: Rohm Co., Ltd.
    Inventor: Shinsuke Takagimoto
  • Publication number: 20180146523
    Abstract: A ground fault detection circuit includes an input portion, and a ground fault determination unit. The input portion inputs an anode voltage of a series connection unit constituted of a plurality of light emission elements. When an anode voltage of the series connection unit input by the input portion is lower than or equal to a predetermined value less than a product of an on-resistance of the short-circuit switch disposed in parallel to each of the light emission elements and current supplied to the series connection unit, the ground fault determination unit determines that a ground fault has occurred without the short-circuit switch in a ground fault path.
    Type: Application
    Filed: November 28, 2017
    Publication date: May 24, 2018
    Inventors: Yoshiyuki Nakatani, Shinsuke Takagimoto
  • Publication number: 20180054862
    Abstract: A switch driving device 10 comprises: multichannel switch elements SW1 to SW8 which are connected in parallel to a plurality of light-emitting elements included in a vehicle-mounted light-emitting device; and a logic portion 120 which automatically starts a series of switch driving sequence so that the on-off states of the switch elements SW1 to SW8 are sequentially switched in a predetermined pattern in response to the power-on of the device.
    Type: Application
    Filed: February 4, 2016
    Publication date: February 22, 2018
    Inventors: Shinsuke Takagimoto, Yasunori MURAMATSU
  • Patent number: 9853439
    Abstract: A light emitting device includes a series connection unit constituted of N light emitting elements, a light emitting element driving circuit having an output terminal connected to an anode of the series connection unit, N short-circuit switches respectively connected in parallel to the light emitting elements, and a switch control unit arranged to control on and off of the short-circuit switches. A ground fault detection circuit, which detects a ground fault of the light emitting device, includes a reference voltage source arranged to generate a reference voltage, and a comparator arranged to compare the anode voltage of the series connection unit with the reference voltage. The reference voltage has a value smaller than the product of an on-resistance of one of the short-circuit switches and output current of the light emitting element driving circuit.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: December 26, 2017
    Assignee: Rohm Co., Ltd.
    Inventors: Yoshiyuki Nakatani, Shinsuke Takagimoto
  • Publication number: 20170337963
    Abstract: A light emitting element driving semiconductor integrated circuit constitutes at least a part of a light emitting element driving device arranged to drive a series connection unit including a plurality of light emitting elements. The light emitting element driving semiconductor integrated circuit includes a single-element short-circuit detection unit arranged to detect that one of the plurality of light emitting elements is short-circuited, and a control unit arranged to control a power element of the light emitting element driving device so that current supplied from the light emitting element driving device to the series connection unit is increased, when the single-element short-circuit detection circuit detects that one of the plurality of light emitting elements is short-circuited.
    Type: Application
    Filed: May 15, 2017
    Publication date: November 23, 2017
    Inventors: Shinsuke TAKAGIMOTO, Yoshiyuki NAKATANI, Masaaki NAKAYAMA
  • Publication number: 20170331272
    Abstract: A light emitting device includes a series connection unit constituted of N light emitting elements, a light emitting element driving circuit having an output terminal connected to an anode of the series connection unit, N short-circuit switches respectively connected in parallel to the light emitting elements, and a switch control unit arranged to control on and off of the short-circuit switches. A ground fault detection circuit, which detects a ground fault of the light emitting device, includes a reference voltage source arranged to generate a reference voltage, and a comparator arranged to compare the anode voltage of the series connection unit with the reference voltage. The reference voltage has a value smaller than the product of an on-resistance of one of the short-circuit switches and output current of the light emitting element driving circuit.
    Type: Application
    Filed: April 28, 2017
    Publication date: November 16, 2017
    Inventors: Yoshiyuki NAKATANI, Shinsuke TAKAGIMOTO
  • Publication number: 20170290118
    Abstract: A light emitting drive device has an output voltage supply unit, and an emergency drive unit. The output voltage supply unit generates an output voltage from an input voltage on the basis of a control signal transmitted from a control unit, and supplies at least one light emitting element with the output voltage. In the cases where the emergency drive unit received a signal indicating abnormality of the control unit, the emergency drive unit lights the whole or a part of the at least one light emitting element irrespective of the control signal transmitted from the control unit.
    Type: Application
    Filed: September 3, 2015
    Publication date: October 5, 2017
    Inventor: Shinsuke TAKAGIMOTO
  • Publication number: 20170238384
    Abstract: A light-emitting element driving device includes a reset signal generation unit that generates a reset signal in accordance with current flowing in a light-emitting element, a set signal generation unit that generates a set signal in accordance with the anode voltage of the light-emitting element, and an output voltage supply unit that generates an output voltage from an input voltage in accordance with the reset signal and the set signal, so as to supply the output voltage to the light-emitting element. The set signal generation unit includes a current generation unit that generates current according to the anode voltage of the light-emitting element, a charging unit that charges the current generated by the current generation unit, and a comparator that generates the set signal in accordance with a comparison result between a charging voltage of the charging unit and a reference voltage.
    Type: Application
    Filed: September 25, 2015
    Publication date: August 17, 2017
    Inventors: Shigenori KAWASE, Shinsuke TAKAGIMOTO, Yoshiyuki NAKATANI
  • Patent number: 9428101
    Abstract: A light emission driving device includes an output voltage supply unit arranged to generate an output voltage from an input voltage so as to supply the output voltage to a load, a determination unit arranged to determine whether or not a ground fault due to abnormality may have occurred on the basis of an anode voltage of the load, and a signal output unit arranged to externally output a signal indicating that a ground fault due to abnormality may have occurred when the determination unit determines that a ground fault due to abnormality may have occurred. The output voltage supply unit does not perform generation stop of the output voltage by a trigger of determination by the determination unit that a ground fault due to abnormality may have occurred.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: August 30, 2016
    Assignee: Rohm Co., Ltd.
    Inventors: Shinsuke Takagimoto, Yoshiyuki Nakatani, Shigenori Kawase
  • Publication number: 20160121783
    Abstract: A light emission driving device includes an output voltage supply unit arranged to generate an output voltage from an input voltage so as to supply the output voltage to a load, a determination unit arranged to determine whether or not a ground fault due to abnormality may have occurred on the basis of an anode voltage of the load, and a signal output unit arranged to externally output a signal indicating that a ground fault due to abnormality may have occurred when the determination unit determines that a ground fault due to abnormality may have occurred. The output voltage supply unit does not perform generation stop of the output voltage by a trigger of determination by the determination unit that a ground fault due to abnormality may have occurred.
    Type: Application
    Filed: November 5, 2015
    Publication date: May 5, 2016
    Inventors: Shinsuke Takagimoto, Yoshiyuki Nakatani, Shigenori Kawase
  • Patent number: 9218012
    Abstract: A power-supply device has a first power supply circuit adapted to generate from an input voltage a first output voltage and a second power supply circuit adapted to generate from the first output voltage a second output voltage. The second power supply circuit monitors the first output voltage to check if it is higher than a first threshold voltage, and also monitors the first power-supply circuit to check if it has started operation for generating the first output voltage, so that the second power supply circuit stays on stand-by, even when the first output voltage is higher than the first threshold voltage, until the first power supply circuit starts operation for generating the first output voltage.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: December 22, 2015
    Assignee: Rohm Co., Ltd.
    Inventors: Shinsuke Takagimoto, Takayuki Nakashima, Nobuhiro Nishikawa
  • Publication number: 20130307435
    Abstract: A power-supply device has a first power supply circuit adapted to generate from an input voltage a first output voltage and a second power supply circuit adapted to generate from the first output voltage a second output voltage. The second power supply circuit monitors the first output voltage to check if it is higher than a first threshold voltage, and also monitors the first power-supply circuit to check if it has started operation for generating the first output voltage, so that the second power supply circuit stays on stand-by, even when the first output voltage is higher than the first threshold voltage, until the first power supply circuit starts operation for generating the first output voltage.
    Type: Application
    Filed: May 7, 2013
    Publication date: November 21, 2013
    Applicant: ROHM CO., LTD.
    Inventors: Shinsuke Takagimoto, Takayuki Nakashima, Nobuhiro Nishikawa
  • Patent number: 7660210
    Abstract: A driver IC 1 has a bias terminal 20a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20b via which a bias voltage fed from a DSP 3 to drive and control a focus coil 5, a tracking coil 6, a sled motor 7, and a spindle motor 8 is fed in.
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: February 9, 2010
    Assignee: Rohm Co., Ltd.
    Inventors: Seiichi Yamamoto, Kenichi Niiyama, Nobuo Nakamachi, Yoshiki Tanaka, Shinsuke Takagimoto
  • Patent number: 7432761
    Abstract: It is desirable that some voltage can be supplied as emergency backup even upon occurrence of abnormality such as a failure. The amplifier circuit in a semiconductor device supplies an output signal having a voltage produced by amplifying an input voltage Vin from a variable voltage source to one end of a coil load, and supplies a predetermined fixed voltage of 0V, for example, to the other end of the coil load to rotate the coil load with the voltage difference between these output signals, thus performing loading control of a CD tray and a DVD tray. The semiconductor device clamps the voltage of the output signal to a predetermined non-zero voltage so that a sufficient drive voltage can be obtained even if a loading control terminal T1 is grounded, thus realizing emergency backup loading control of the tray.
    Type: Grant
    Filed: June 17, 2005
    Date of Patent: October 7, 2008
    Assignee: Rohm Co., Ltd.
    Inventors: Shinsuke Takagimoto, Koji Miyamoto