Patents by Inventor Takeshi SAKIEDA

Takeshi SAKIEDA 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).

  • Patent number: 12092455
    Abstract: The influence of a leakage magnetic flux from a magnet on a magnetic sensor configured to detect a magnetic flux from the permanent magnet is reduced. An absolute encoder includes a first magnet provided at a leading end side of a first worm gear part, a first angle sensor configured to detect a rotation angle of the first worm gear part corresponding to a change in a magnetic flux generated from the first magnet, a second magnet provided at a leading end side of a second worm wheel part, a second angle sensor configured to detect a rotation angle of the second worm wheel part corresponding to a change in a magnetic flux generated from the second magnet, and a gear base part configured to surround at least a part of a periphery of the first angle sensor and the second angle sensor.
    Type: Grant
    Filed: January 27, 2021
    Date of Patent: September 17, 2024
    Assignee: MINEBEA MITSUMI Inc.
    Inventors: Takeshi Sakieda, Katsunori Saito, Yujin Ishi
  • Patent number: 12044551
    Abstract: Detection accuracy of a rotation angle of a sub-shaft is to be improved. In an absolute encoder according to an embodiment of the present invention, a second worm wheel part is a second driven gear, has a central axis orthogonal to a central axis of a first worm wheel part, and meshes with a second worm gear part. A support shaft rotatably supports the second worm wheel part. A magnet (Mq) rotates integrally with the support shaft. An angle sensor (Sq) is provided near the magnet (Mq) and detects a change in a magnetic flux generated from the magnet (Mq). A first bearing has an outer ring fixed at the second worm wheel part and an inner ring fixed at the support shaft. A second bearing has an inner ring fixed at the support shaft.
    Type: Grant
    Filed: March 11, 2021
    Date of Patent: July 23, 2024
    Assignee: MINEBEA MITSUMI Inc.
    Inventors: Katsunori Saito, Takeshi Sakieda
  • Publication number: 20240230309
    Abstract: An influence of use orientation on detection accuracy is reduced. A magnetism detection device includes a magnet (Mr) magnetized, an angle sensor (Sr) as a magnetic sensor configured to detect a magnetic flux from the magnet (Mr), a magnet holder holding the magnet (Mr), and a second layshaft gear shaft. The magnet holder is rotatably supported on the second layshaft gear shaft. The second layshaft gear shaft is made of a magnetic material. An attractive force due to a magnetic force is generated between the magnet (Mr) and the second layshaft gear shaft in a direction of a rotation axis of the magnet holder.
    Type: Application
    Filed: February 24, 2022
    Publication date: July 11, 2024
    Inventors: Yasuo OSADA, Katsunori SAITO, Takeshi SAKIEDA, Norikazu SATO
  • Publication number: 20240175724
    Abstract: To suppress deterioration in the detection accuracy of a rotation angle of a magnet even when a member located in the vicinity of the magnet is made of a magnetic material. An absolute encoder includes a first sub-shaft gear configured to rotate based on rotation of a main shaft, a bearing part configured to rotatably support the first sub-shaft gear around an axial line A, a support shaft configured to support the bearing part, and a spacer provided between the first sub-shaft gear and the bearing part. At least a part of the spacer is formed of a magnetic material, and the spacer is formed extending in a direction intersecting the axial line A.
    Type: Application
    Filed: March 11, 2022
    Publication date: May 30, 2024
    Inventors: Katsunori SAITO, Takeshi SAKIEDA
  • Publication number: 20240175670
    Abstract: To improve the detection accuracy of a rotation angle of a rotation shaft caused by the magnetic flux distribution of a magnet. In an absolute encoder, a support shaft has one end fixed to a gear base part as a substrate, and includes a flange part at the other end. A first bearing and a second bearing as at least one bearing include inner rings fixed to the support shaft. The first bearing and the second bearing are disposed between the gear base part and the flange part in an axial direction. A spacer is disposed between the first bearing and the second bearing, and a magnet (Mq), in the axial direction of the support shaft. The spacer is in contact with outer rings of the first bearing and the second bearing from the axial direction inside a bearing fixing part.
    Type: Application
    Filed: March 11, 2022
    Publication date: May 30, 2024
    Inventors: Katsunori SAITO, Hiroki NEGISHI, Takeshi SAKIEDA
  • Publication number: 20240141940
    Abstract: Provided is a shaft support structure capable of improving mounting accuracy of a shaft to be press-fitted. The shaft support structure includes a main shaft adapter and a main shaft as a supporting member including a press-fitting portion for press-fitting the main shaft adapter from one end portion. The main shaft adapter has a tapered surface portion having a diameter of one end portion smaller than a diameter of a peripheral surface. The tapered surface portion is subjected to curved surface processing at a connecting portion with the peripheral surface.
    Type: Application
    Filed: February 24, 2022
    Publication date: May 2, 2024
    Inventors: Takeshi SAKIEDA, Katsunori SAITO, Norikazu SATO, Yasuo OSADA
  • Publication number: 20240133670
    Abstract: An influence of use orientation on detection accuracy is reduced. A magnetism detection device includes a magnet (Mr) magnetized, an angle sensor (Sr) as a magnetic sensor configured to detect a magnetic flux from the magnet (Mr), a magnet holder holding the magnet (Mr), and a second layshaft gear shaft. The magnet holder is rotatably supported on the second layshaft gear shaft. The second layshaft gear shaft is made of a magnetic material. An attractive force due to a magnetic force is generated between the magnet (Mr) and the second layshaft gear shaft in a direction of a rotation axis of the magnet holder.
    Type: Application
    Filed: February 24, 2022
    Publication date: April 25, 2024
    Inventors: Yasuo OSADA, Katsunori SAITO, Takeshi SAKIEDA, Norikazu SATO
  • Publication number: 20230095065
    Abstract: Detection accuracy of a rotation angle of a sub-shaft is to be improved. In an absolute encoder according to an embodiment of the present invention, a second worm wheel part is a second driven gear, has a central axis orthogonal to a central axis of a first worm wheel part, and meshes with a second worm gear part. A support shaft rotatably supports the second worm wheel part. A magnet (Mq) rotates integrally with the support shaft. An angle sensor (Sq) is provided near the magnet (Mq) and detects a change in a magnetic flux generated from the magnet (Mq). A first bearing has an outer ring fixed at the second worm wheel part and an inner ring fixed at the support shaft. A second bearing has an inner ring fixed at the support shaft.
    Type: Application
    Filed: March 11, 2021
    Publication date: March 30, 2023
    Inventors: Katsunori SAITO, Takeshi SAKIEDA
  • Publication number: 20230071255
    Abstract: The influence of a leakage magnetic flux from a magnet on a magnetic sensor configured to detect a magnetic flux from the permanent magnet is reduced. An absolute encoder includes a first magnet provided at a leading end side of a first worm gear part, a first angle sensor configured to detect a rotation angle of the first worm gear part corresponding to a change in a magnetic flux generated from the first magnet, a second magnet provided at a leading end side of a second worm wheel part, a second angle sensor configured to detect a rotation angle of the second worm wheel part corresponding to a change in a magnetic flux generated from the second magnet, and a gear base part configured to surround at least a part of a periphery of the first angle sensor and the second angle sensor.
    Type: Application
    Filed: January 27, 2021
    Publication date: March 9, 2023
    Inventors: Takeshi SAKIEDA, Katsunori SAITO, Yujin ISHI