公开(公告)号：US20240255637A1

公开(公告)日：2024-08-01

申请号：US18614786

申请日：2024-03-25

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Shinichi SASAKI ,  Takaaki ASADA ,  Yuuma WATABE

IPC: G01S15/10 ,  G01S7/524 ,  G01S7/527

CPC classification number: G01S15/102 ,  G01S7/524 ,  G01S7/5276 ,  G01S15/101

Abstract: An object detection device includes a transmitter to generate an acoustic wave as a signal wave based on a predetermined transmission signal and transmit the signal wave toward an object, a receiver provided separately from the transmitter and to receive the acoustic wave to generate a reception signal, and a controller to generate the transmission signal to control the signal wave from the transmitter. The receiver has frequency characteristics such that the reception signal fluctuates when the receiver resonates. The transmission signal is set according to the frequency characteristics of the receiver to reduce or prevent a resonance of the receiver at a time of reception of the signal wave from the transmitter.

公开(公告)号：US20240337739A1

公开(公告)日：2024-10-10

申请号：US18749159

申请日：2024-06-20

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Shinichi SASAKI ,  Takaaki ASADA ,  Yuuma WATABE

IPC: G01S7/54 ,  G01S7/527 ,  G01S7/536 ,  G01S15/04

CPC classification number: G01S7/54 ,  G01S7/527 ,  G01S7/536 ,  G01S15/04

Abstract: An object detector includes a wave transmitter to transmit a modulated wave in a predetermined frequency range to an object, a first wave receiver to receive sound waves and to generate a first wave reception signal indicative of the reception of the sound waves, a second wave receiver to receive sound waves and to generate a second wave reception signal indicative of the reception of the sound waves, an adder to generate a third wave reception signal by adding the first and second wave reception signals, and a controller to detect the object based on the third wave reception signal by causing the wave transmitter to transmit the modulated wave. The second wave receiver is farther from the wave transmitter than the first wave receiver. A fluctuation range of the third wave reception signal is not greater than a fluctuation range of the first wave reception signal.

公开(公告)号：US20240118415A1

公开(公告)日：2024-04-11

申请号：US18536530

申请日：2023-12-12

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuuma WATABE ,  Takaaki ASADA ,  Shinichi SASAKI

IPC: G01S15/62 ,  G01S7/524 ,  G01S7/53

CPC classification number: G01S15/62 ,  G01S7/524 ,  G01S7/53

Abstract: A displacement detection device includes a transmitter, a receiver, and a controller configured or programmed to output a first transmission signal to the transmitter to transmit a modulated wave and acquire a responsive first reception signal in a first measurement period, extract first phase information indicating a phase defined in a correlation between a first transmission signal and a reception signal, output a second transmission signal to the transmitter and acquire a responsive second reception signal in a second measurement period after the first measurement period, extract second phase information indicating a phase defined in a correlation between the second transmission signal and reception signal, and detect a displacement of an object between the first and second measurement periods, depending on a difference between the first and second phase information.

公开(公告)号：US20240118402A1

公开(公告)日：2024-04-11

申请号：US18537871

申请日：2023-12-13

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuuma WATABE ,  Takaaki ASADA ,  Shinichi SASAKI

IPC: G01S7/539 ,  G01S7/52 ,  G01S15/10

CPC classification number: G01S7/539 ,  G01S7/52004 ,  G01S15/10

Abstract: An object detection device includes a wave transmitter to transmit a sound wave to an object, a wave receiver to receive the sound wave and generate a signal representing a reception result, and a controller to control transmission of the sound wave by the wave transmitter and obtain the receive signal from the wave receiver. The controller is configured or programmed to output a transmit signal to cause the wave transmitter to transmit the sound wave and obtain a corresponding receive signal. The controller is configured or programmed to generate detection information about the object by performing complexification on a correlation signal representing a correlation between the transmit signal and the receive signal. A signal corrector is configured or programmed to correct any of the correlation signal, the receive signal, and the transmit signal to mitigate a direct-current component in the correlation signal targeted for the complex analysis.