公开(公告)号：US12044808B2

公开(公告)日：2024-07-23

申请号：US17932955

申请日：2022-09-16

Applicant: DENSO CORPORATION

Inventor： Masayoshi Satake ,  Dai Kondou ,  Haruka Aoshima ,  Kenji Fukabori ,  Kohei Kozuki

IPC: G01S7/521 ,  G01S15/32 ,  G01S15/931

CPC classification number: G01S7/521 ,  G01S15/32 ,  G01S15/931 ,  G01S2015/938 ,  G01S2015/939

Abstract: An ultrasonic transducer includes a transducer case and an ultrasonic element. The transducer case is formed into a bottomed, cylindrical shape having a side plate portion and a bottom plate portion that seals one end side of the side plate portion in an axial direction to configure a diaphragm. The ultrasonic element is fixedly supported to the bottom plate portion to face an interior space surrounded by the side plate portion and the bottom plate portion. The ultrasonic element is arranged in a position being offset in an in-plane direction orthogonal to the axial direction relative to a center position of the diaphragm in the in-plane direction to be capable of generating a first transmission wave having first directivity characteristics and a second transmission wave having second directivity characteristics that are directivity characteristics differing from the first directivity characteristics and in which sound pressure in the axial direction is decreased.

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.