公开(公告)号：US20230071255A1

公开(公告)日：2023-03-09

申请号：US17759744

申请日：2021-01-27

Applicant: MINEBEA MITSUMI Inc.

Inventor： Takeshi SAKIEDA ,  Katsunori SAITO ,  Yujin ISHI

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

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.

公开(公告)号：US20220221310A1

公开(公告)日：2022-07-14

申请号：US17593766

申请日：2020-03-13

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yujin ISHI ,  Yasuo OSADA

IPC: G01D5/249

Abstract: An absolute encoder includes a circuit board disposed away from a rotation shaft of a motor in a shaft direction of the rotation shaft thereof, the circuit board being fixed to top end surfaces of multiple pillars each extending from a motor side, by respective locking sections. The absolute encoder includes a sensor disposed, on the circuit board, facing a rotating body that rotates in accordance with rotation of the rotation shaft, the sensor being configured to detect a rotation amount of the rotating body. The circuit board includes first fixing portions each fixed to a top end surface of a given pillar, by a corresponding locking section. The circuit board includes a second fixing portion fixed to a top end surface of a given pillar by a corresponding locking section, the second fixing portion being connected to a ground. At each of the first fixing portions, an adjustment portion is disposed between the circuit board and a top end portion of a given pillar is provided, the adjustment portion being set to adjust a distance between the circuit board and the top end portion of the given pillar, so that a height of the circuit board at a given first fixing portion is set to be the same as a height of the circuit board at the second fixing portion.

公开(公告)号：US20250100162A1

公开(公告)日：2025-03-27

申请号：US18730917

申请日：2023-01-23

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yujin ISHI

IPC: B25J13/08

Abstract: A gripping device includes a motor configured to rotate according to an operation value; a grasper including a first finger and a second finger, the grasper being configured to change a distance between the first finger and the second finger by using the motor, and to grip an object with the first finger and the second finger; a force detector configured to detect a gripping force by which the object is gripped with the first finger and the second finger, upon occurrence of a condition in which the object is gripped with the first finger and the second finger; and a controller configured to output the operation value such that a force detection value of the gripping force detected by the force detector matches a force command value. The controller is configured to detect a deviation of the object from a predetermined reference position based on a time period from a start of a gripping operation from a timing at which any one of the first finger and the second finger contacts the object.

公开(公告)号：US20220155051A1

公开(公告)日：2022-05-19

申请号：US17593858

申请日：2020-03-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Norikazu SATO ,  Kaoru NISHIGUCHI ,  Hiroyuki HISHIYAMA ,  Yujin ISHI

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

Abstract: An absolute encoder preferable in being made compact is provided.
The absolute encoder includes a worm gear, a permanent magnet (19) provided on a top end side of the worm gear, and magnetic sensors. In the permanent magnet (19), a given first polar portion (N) among first polar portions each having a first polarity and a given second polar portion (S) among second polar portions each having a second polarity different from the first polarity are formed adjacent to each other, when viewed from an end surface of the permanent magnet (19) in an axial direction thereof. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in a radial direction, with a radial middle portion of the permanent magnet (19) that is a boundary. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in an axial direction, with an axial middle portion of the permanent magnet (19) that is a boundary.

公开(公告)号：US20230332877A1

公开(公告)日：2023-10-19

申请号：US17759730

申请日：2021-01-27

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yujin ISHI

IPC: G01B7/30 ,  G01D5/14

CPC classification number: G01B7/30 ,  G01D5/145 ,  G01D2205/26 ,  G01D2205/28

Abstract: To correct an error based on a position of a main spindle. An absolute encoder includes a magnet as a permanent magnet provided at a leading end side of a first worm gear part, an angle sensor as an 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 magnet, a microcomputer configured to output angle position information of a first driving gear in a stopped state, wherein the microcomputer outputs angle error information of the first driving gear corresponding to the angle position information.