公开(公告)号：US12000969B2

公开(公告)日：2024-06-04

申请号：US17649870

申请日：2022-02-03

Applicant: DENSO CORPORATION

Inventor： Yu Koyama ,  Youhei Suzuki ,  Dai Kondou ,  Satoru Noro ,  Hideki Ootsuka

IPC: G01S7/524 ,  G01S15/931

CPC classification number: G01S7/524 ,  G01S15/931

Abstract: In a drive device for driving an ultrasonic transmitter, a drive signal generating unit generates a drive signal for driving the ultrasonic transmitter, based on a base signal having a plurality of unit frequency signals arranged in a time series, corresponding to respective codes forming a code sequence. When a first unit frequency signal and a second unit frequency signal chronologically adjacent to it are switched in a discontinuously switching state that is different from a continuously switching state where the first and second unit frequency signals are switched such that a target frequency for a transmission frequency changes continuously at a substantially constant rate, the drive signal generating unit shifts the frequency in at least a switching portion immediately after start of the second unit frequency signal, in a same direction as a direction of frequency change from the first unit frequency signal to the second unit frequency signal.

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.