公开(公告)号：US11255931B2

公开(公告)日：2022-02-22

申请号：US16748934

申请日：2020-01-22

Applicant: DENSO CORPORATION ,  SOKEN, INC.

Inventor： Toshiro Suzuki ,  Satoru Jinno ,  Shigetoshi Fukaya ,  Ken Tanaka ,  Kensuke Kobayashi

IPC: G01R33/09 ,  H02K1/2753 ,  H02K1/14 ,  G01R33/00 ,  G01L3/10 ,  G01L5/00 ,  G01R33/07

Abstract: A torsion bar of a torque detection device converts torque applied between an input shaft and an output shaft to a torsional displacement. A pair of yokes is secured to the output shaft, and forms a magnetic circuit in a magnetic field of a multipolar magnet secured to the input shaft. A magnetic flux guide member has a main body facing the yoke to guide magnetic flux of the magnetic circuit. A magnetic sensor is placed at an extension, and detects magnetic flux guided by the magnetic flux guide member. The magnetic flux guide member is configured to allow magnetic permeance per unit area between the magnetic flux guide member and the yoke to be greater at a location in the main body from which the extension is branched, than at a circumferential end portion of the main body.

公开(公告)号：US12038541B2

公开(公告)日：2024-07-16

申请号：US17650206

申请日：2022-02-07

Applicant: DENSO CORPORATION

Inventor： Kensuke Kobayashi ,  Masayoshi Satake ,  Dai Kondo

IPC: G01S7/52 ,  G01S7/521 ,  G01S15/931 ,  H04R17/02

CPC classification number: G01S7/52004 ,  G01S7/521 ,  G01S15/931 ,  H04R17/02 ,  G01S2007/52009

Abstract: An ultrasonic sensor includes an adhesion sensor including a variable capacitance and a fixed capacitance. The variable capacitance includes a sensor electrode provided on a first surface of a bottom having a microphone installed thereon and a capacitance value thereof changes in accordance with adhesion of foreign matter on the first surface. The fixed capacitance includes a first electrode connected to the sensor electrode, and a second electrode provided on a member different from a microphone housing and disposed facing the first electrode. The adhesion sensor further includes an adhesion detecting section that is connected to the sensor electrode via the fixed capacitance and detects adhesion of foreign matter to the first surface by supplying an alternating-current signal to the fixed capacitance and the variable capacitance.

公开(公告)号：US11971479B2

公开(公告)日：2024-04-30

申请号：US17519326

申请日：2021-11-04

Applicant: DENSO CORPORATION

Inventor： Masayoshi Satake ,  Youhei Suzuki ,  Kensuke Kobayashi ,  Dai Kondo ,  Syoya Ishida ,  Yudai Yamamoto ,  Kenji Fukabori

IPC: G01S15/931 ,  G01S7/521

CPC classification number: G01S15/931 ,  G01S7/521 ,  G01S2015/938

Abstract: An ultrasonic sensor is provided with an ultrasonic element that converts between an electrical signal and an ultrasonic vibration and an element accommodating case having a bottomed cylindrical shape and accommodating the ultrasonic element inside thereof. The element accommodating case includes a side plate portion formed in a cylindrical shape that surrounds a directional center axis, and a bottom plate portion that closes one end side of the side plate portion in an axial direction which is parallel to the directional center axis. The ultrasonic element is attached to the bottom plate portion. The bottom plate portion includes at least one protrusion. The protrusions vibrate together with the bottom plate portion when the bottom plate portion vibrates as an ultrasonic vibration.

公开(公告)号：US12140713B2

公开(公告)日：2024-11-12

申请号：US17470309

申请日：2021-09-09

Applicant: DENSO CORPORATION

Inventor： Kensuke Kobayashi ,  Satoru Noro

IPC: G01S7/521 ,  G01N29/34 ,  G01S7/52 ,  G01S15/931 ,  H04R1/08 ,  H04R17/02 ,  H10N30/30 ,  H10N30/87

Abstract: An ultrasonic sensor includes a first electrode, a second electrode, and a third electrode. The first electrode is provided an ultrasonic microphone that includes a vibration element that provides a function for converting between mechanical vibrations and electrical signals. The second electrode is externally from the ultrasonic microphone such that an electrical characteristic between the second electrode and the first electrode changes based on an adhesion state of substances adhering to the ultrasonic microphone. The third electrode is provided so as to suppress changes in the electrical characteristic between the first electrode and the second electrode caused by factors other than the adhesion of substances adhering to the ultrasonic microphone.