Patents by Inventor Ryuichi Nakajima

Ryuichi Nakajima 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: 20230062075
    Abstract: A filp-flop circuit includes master latch including a first inverter and a first tri-state inverter, wherein the first tri-state inverter includes a first NMOS transistor and a first PMOS transistor; a slave latch including a second inverter and a second tri-state inverter, wherein the second tri-state inverter includes a second PMOS transistor and a second NMOS transistor; and at least one of a first wiring configured to connect a source of the first PMOS transistor and a source of the first NMOS transistor and a second wiring configured to connect a source of the second PMOS transistor and a source of the second NMOS transistor.
    Type: Application
    Filed: August 30, 2022
    Publication date: March 2, 2023
    Inventors: Kazuya IOKI, Ryuichi NAKAJIMA, Kazutoshi KOBAYASHI, Jun FURUTA
  • Patent number: 11381182
    Abstract: Provided is a vehicle door opening/closing device. Given that a door is in an initial fully-open position, a storage unit stores: a target speed map for defining a relation between the door position and the target speed of a motor; and information indicative of an arbitrary fully open position set by a user. A map speed computation unit calculates a map speed based on the target speed map, whereas a gradually decreasing speed calculation unit calculates a gradually decreasing target speed for decreasing at a prescribed deceleration rate as the arbitrary fully open position gets closer so that a prescribed terminal speed is reached at the arbitrary fully open position. A speed sequence control unit switches a set target speed to the gradually decreasing target speed from the map speed at a door position where the gradually decreasing target speed becomes slower than the map speed.
    Type: Grant
    Filed: February 18, 2019
    Date of Patent: July 5, 2022
    Assignee: MITSUBA Corporation
    Inventors: Ikuharu Yokozawa, Ryuichi Nakajima
  • Publication number: 20210230923
    Abstract: Provided is a vehicle door opening/closing device. Given that a door is in an initial fully-open position, a storage unit stores: a target speed map for defining a relation between the door position and the target speed of a motor; and information indicative of an arbitrary fully open position set by a user. A map speed computation unit calculates a map speed based on the target speed map, whereas a gradually decreasing speed calculation unit calculates a gradually decreasing target speed for decreasing at a prescribed deceleration rate as the arbitrary fully open position gets closer so that a prescribed terminal speed is reached at the arbitrary fully open position. A speed sequence control unit switches a set target speed to the gradually decreasing target speed from the map speed at a door position where the gradually decreasing target speed becomes slower than the map speed.
    Type: Application
    Filed: February 18, 2019
    Publication date: July 29, 2021
    Applicant: MITSUBA Corporation
    Inventors: IKUHARU YOKOZAWA, RYUICHI NAKAJIMA
  • Patent number: 8857890
    Abstract: A hypocycloid reducer 70 for reducing rotation of a flat motor 60 to output the speed-reduced rotation to a drum is provided between the drum and the flat motor 60, a rotor shalt member 65 which is rotated with the same rotation number as the flat motor 60 is axially aligned with the drum is provided on the same side as the flat motor 60. An output rotation body 74 for outputting the speed-reduced rotation is axially aligned with the drum and provided on the same side as the drum. Since the rotor shaft member 65 and the output rotation body 74 are axially aligned with the drum, turning force can be transmitted bi-directionally between the rotor shaft member 65 and the output rotation body 74. Therefore, it is possible to eliminate an electromagnetic clutch to reduce the driving apparatus in size and weight, and since wires and control logic of the electromagnetic clutch are not needed for the driving apparatus, the driving apparatus can be reduced in production cost.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: October 14, 2014
    Assignee: Mitsuba Corporation
    Inventors: Mitsuhiro Okada, Ryuichi Nakajima, Tatsuyuki Saito, Zentaro Yamaguchi
  • Publication number: 20130160581
    Abstract: A hypocycloid reducer 70 for reducing rotation of a flat motor 60 to output the speed-reduced rotation to a drum is provided between the drum and the flat motor 60, a rotor shalt member 65 which is rotated with the same rotation number as the flat motor 60 is axially aligned with the drum is provided on the same side as the flat motor 60. An output rotation body 74 for outputting the speed-reduced rotation is axially aligned with the drum and provided on the same side as the drum. Since the rotor shaft member 65 and the output rotation body 74 are axially aligned with the drum, turning force can be transmitted bi-directionally between the rotor shaft member 65 and the output rotation body 74. Therefore, it is possible to eliminate an electromagnetic clutch to reduce the driving apparatus in size and weight, and since wires and control logic of the electromagnetic clutch are not needed for the driving apparatus, the driving apparatus can be reduced in production cost.
    Type: Application
    Filed: June 3, 2011
    Publication date: June 27, 2013
    Applicant: MITSUBA CORPORATION
    Inventors: Mitsuhiro Okada, Ryuichi Nakajima, Tatsuyuki Saito, Zentaro Yamaguchi