公开(公告)号：US20190107611A1

公开(公告)日：2019-04-11

申请号：US16085208

申请日：2017-02-22

Applicant: DENSO CORPORATION

Inventor： Mitsuyasu MATSUURA ,  Taketo HARADA ,  Tetsuya AOYAMA ,  Yu KOYAMA

IPC: G01S7/521 ,  G01S15/04

Abstract: An object detection apparatus drives a piezoelectric vibrator to transmit an ultrasonic wave, and receives a reflected wave that is reflected from an object. The object detection apparatus includes the piezoelectric vibrator, a drive circuit that supplies drive power which drives the piezoelectric vibrator, and a resistor section that is connected in parallel with the piezoelectric vibrator and has a resistance value that is variable.

公开(公告)号：US20230393273A1

公开(公告)日：2023-12-07

申请号：US18453959

申请日：2023-08-22

Applicant: DENSO CORPORATION

Inventor： Masayoshi SATAKE ,  Yu KOYAMA ,  Haruka AOSHIMA ,  Tetsuya AOYAMA

IPC: G01S15/931

CPC classification number: G01S15/931 ,  G01S2015/938

Abstract: An ultrasonic sensor installable to a vehicle includes a shield section, a vibration conversion section, and an electric circuit section. The shield section includes a conductive layer. The conductive layer is bonded to an outer plate, which is a body part formed of non-conductive material, on an inner surface side of the outer plate. A vibration conversion section, which has a function of converting ultrasonic vibration and electrical signals, is bonded to the shield section to enable ultrasonic vibration together with the outer plate. An electric circuit section is electrically connected to the vibration conversion section to enable the transfer of the electric signals to and from the vibration conversion section. The shield section is electrically short-circuited to a ground side line electrically connected to the electric circuit section to shield the vibration conversion section.

公开(公告)号：US20230366999A1

公开(公告)日：2023-11-16

申请号：US18357368

申请日：2023-07-24

Applicant: DENSO CORPORATION

Inventor： Masayoshi SATAKE ,  Yu KOYAMA ,  Tetsuya AOYAMA ,  Mitsumasa MIYAZAKI

IPC: G01S7/521 ,  G01S15/931

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

Abstract: An ultrasonic sensor installable to a vehicle includes a magnetic body capable of ultrasonic vibration and an electric-magnetic converter having a conversion function between an oscillating magnetic field corresponding to the ultrasonic vibration of the magnetic body and an electric signal. The magnetic body is located on an outer surface side of an outer plate of the vehicle, which is the surface facing an external space of the vehicle. The electric-magnetic converter is located to face the magnetic body with the outer plate interposed therebetween on an inner surface side, which is a back surface of the outer surface of the outer plate.

公开(公告)号：US20220155428A1

公开(公告)日：2022-05-19

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

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：US20210311190A1

公开(公告)日：2021-10-07

申请号：US17349606

申请日：2021-06-16

Applicant: SOKEN, INC. ,  DENSO CORPORATION

Inventor： Yu KOYAMA ,  Mitsuyasu MATSUURA ,  Hideki OTSUKA

IPC: G01S15/931 ,  G01S15/10 ,  G01S7/523 ,  G01S15/58

Abstract: In an object detection device, a signal generation unit generates a drive signal, a transmission unit transmits an ultrasonic wave as a search wave in response to the input drive signal, and a reception unit receives an ultrasonic wave to generate a received signal. A judging unit performs object detection determination based on the received signal. The drive signal has at least two frequencies, and the judging unit extracts at least two amplitudes corresponding to the at least two frequencies from the received signal, and performs determination based on a relationship between the at least two amplitudes.

公开(公告)号：US20210055397A1

公开(公告)日：2021-02-25

申请号：US17092639

申请日：2020-11-09

Applicant: DENSO CORPORATION

Inventor： Mitsuyasu MATSUURA ,  Yu KOYAMA ,  Taketo HARADA

IPC: G01S7/527 ,  G01S15/04

Abstract: An object detection device includes a signal generation unit, a drive unit, an object determination unit, and a drive control unit. The signal generation unit generates at least one pulse signal that includes an identification code for identifying the ultrasonic wave. The drive unit drives the wave transceiver unit using a current or a voltage according to the at least one pulse signal. The object determination unit compares a code included in the received ultrasonic wave with the identification code and determines whether the received ultrasonic wave is a wave resulting from reflection of the ultrasonic wave transmitted by the wave transceiver unit, and determines whether an object is present in a predetermined detection range based on the amplitude of the received ultrasonic wave. The drive control unit reduces the current or the voltage used by the drive unit when a predetermined amplitude rise time has elapsed.

公开(公告)号：US20200260170A1

公开(公告)日：2020-08-13

申请号：US16861832

申请日：2020-04-29

Applicant: DENSO CORPORATION

Inventor： Yu KOYAMA

IPC: H04R1/08 ,  G01S7/521 ,  H01L41/09 ,  H01L41/053 ,  H04R17/02 ,  G01N29/34

Abstract: In an ultrasonic sensor that is attached to a body component, a negative electrode line connected to a negative terminal is isolated from a shielding portion. The shielding portion is connected to a ground potential point without being connected to the negative electrode line.

公开(公告)号：US20200049818A1

公开(公告)日：2020-02-13

申请号：US16659820

申请日：2019-10-22

Applicant: DENSO CORPORATION

Inventor： Tetsuya AOYAMA ,  Yu KOYAMA ,  Dai KONDO

IPC: G01S15/93 ,  G01S7/56 ,  G01S7/521 ,  G01S7/52 ,  G01S7/526 ,  G01S15/87

Abstract: An object detection device includes: a transceiver section that transmits an ultrasonic wave and receives an ultrasonic wave including a reflected wave of the transmitted ultrasonic wave, and outputs a signal in accordance with a wavelength of the received ultrasonic wave; a frequency control section that changes a frequency of the ultrasonic wave transmitted by the transceiver section to a plurality of frequencies different from a driving frequency used to detect the distance from the object; and a fault determination section that determines whether a fault occurs in the function of detecting the distance from the object due to a value of an environment temperature or a wavelength of the ultrasonic wave transmitted by the transceiver section, based on a value of the signal outputted from the transceiver section when the transceiver section transmits the ultrasonic wave at a selected one of the frequencies different from the driving frequency.

公开(公告)号：US20190302248A1

公开(公告)日：2019-10-03

申请号：US15781589

申请日：2016-11-30

Applicant: DENSO CORPORATION

Inventor： Yu KOYAMA ,  Tetsuya AOYAMA ,  Taketo HARADA

IPC: G01S7/524 ,  G01S15/04

Abstract: An object detection device is applied to an object detection system configured such that connection to a control device is made via a communication line to perform power supply via the communication line and a signal is superimposed on current flowing through the communication line to transfer information. The object detection device is configured to drive a piezoelectric vibrator in a predetermined control period and transmit a survey wave and receive a wave reflected by an object. The object detection device includes a capacitor connected in parallel with a driver circuit configured to drive the piezoelectric vibrator, and a current control unit configured to control the current value of the communication line after the end of supplying power to the driver circuit.