公开(公告)号：US20190257639A1

公开(公告)日：2019-08-22

申请号：US16071118

申请日：2017-03-13

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： TAKUYA TOMIDA ,  TAKESHI UEMURA ,  HIDEAKI FUJIURA ,  RYO OSABE

IPC: G01B7/30 ,  G01D5/14

Abstract: A rotation detecting device includes first to fourth magneto-resistive elements that are provided on a first substrate to constitute a bridge circuit, a detection circuit provided on a second substrate, first to fourth wirings each connecting between the detection circuit and respective one of ends of the first to fourth magneto-resistive elements, first to fourth nodes provided on the second substrate, and first and second amplifiers provided on the second substrate. The first node combines signals on the first and second wirings. The second node combines signals on the third and fourth wirings. The first and second amplifiers amplify signals at the first and second nodes, respectively.

公开(公告)号：US20200064416A1

公开(公告)日：2020-02-27

申请号：US16612417

申请日：2018-05-18

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： HIDEAKI FUJIURA ,  TAKUYA TOMIDA ,  RYO OSABE

IPC: G01R33/09 ,  G01D5/244 ,  H01L43/06 ,  H01L43/08 ,  H01L23/00

Abstract: The present disclosure provides a magnetic sensor with improved accuracy or reliability. The magnetic sensor includes a first magnetism detection element that outputs a first detection signal, a second magnetism detection element that outputs a second detection signal, and a detection circuit that receives the first and second detection signals. The detection circuit corrects the first detection signal for each section in a ( 1/16n) period of the first detection signal, when n is a natural number. With this configuration, the magnetic sensor has high accuracy or high reliability, and therefore is useful as, for example, a magnetic sensor used for detecting a steering angle and the like of a vehicle.

公开(公告)号：US20190257671A1

公开(公告)日：2019-08-22

申请号：US16071134

申请日：2017-03-13

Applicant: Panasonic Intellectual Property Management Co.,Ltd

Inventor： RYO OSABE ,  HIDEAKI FUJIURA ,  TAKESHI UEMURA ,  TAKUYA TOMIDA

IPC: G01D5/16 ,  G01D5/14 ,  G01R15/20 ,  G01R35/00 ,  G01R33/09 ,  G01R33/07 ,  B62D15/02

Abstract: A rotation detecting device includes first and second magnetic detection elements that output first and second signals and a detection circuit having the first and second signals input thereto. The detection circuit includes an automatic correction circuit that performs generating and updating of a correction value for correcting the and second signals. The automatic correction circuit is configured to stop the generating or the updating of the correction value in at least one of a case where a rotation direction of an object is changed to a reverse rotation direction from a normal rotation direction and a case where a rotation direction of the object is changed to the normal rotation direction from the reverse rotation direction.