To provide an ultrasonic sensor capable of, when switching a phase or the like during transmission of a survey wave, more stabilizing the survey wave after switching.SOLUTION: An ultrasonic sensor 10 for transmitting a survey wave each time of predetermined transmission opportunity comprises: a transmission part 14 having a piezoelectric element for transmitting a survey wave by resonating with power supply to the piezoelectric element; a transmission circuit 13 for supplying power to the piezoelectric element; and a transmission control part 12 for driving the transmission circuit 13 to cause the transmission part 14 to transmit the survey wave during one transmission opportunity, and for switching transmission characteristics including at least one of a phase, frequency, cycle and amplitude to drive the transmission circuit 13 after the lapse of a predetermined time from the start of transmission of the survey wave. The transmission control part 12 has an OFF period for interrupting power supply from the transmission circuit 13 to the piezoelectric element when switching the transmission characteristics.SELECTED DRAWING: Figure 1
【課題】探査波の送信中に位相等を切り替えるうえで、切り替え後の探査波をより安定させることが可能な超音波センサを提供する。【解決手段】所定の送信機会毎に探査波を送信する超音波センサ10であって、圧電素子を有し、その圧電素子へ電力が供給されることで共振して探査波の送信を行う送信部14と、圧電素子へ電力を供給する送信回路13と、1送信機会において、送信回路13を駆動して送信部14から探査波を送信させ、探査波の送信開始から所定時間経過後に、位相、周波数、周期及び振幅の少なくともひとつを含む送信特性を切り替えて送信回路13を駆動する送信制御部12と、を備え、送信制御部12は、送信特性の切り替え時に、送信回路13から圧電素子への電力の供給を中断するオフ期間を設ける。【選択図】 図1
ULTRASONIC SENSOR AND OBJECT DETECTION SYSTEM
超音波センサ及び物体検知システム
2018-12-20
Patent
Electronic Resource
Japanese
IPC: | G01S RADIO DIRECTION-FINDING , Funkpeilung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS |
European Patent Office | 2018
|European Patent Office | 2024