Ultrasonic Device, Multi-Feed Detector, Transport Device, And Scanner

原文（中国語）

An ultrasonic device includes an ultrasonic element that performs at least one of transmission of ultrasonic waves and reception of ultrasonic waves, and a housing that houses the ultrasonic element, wherein the housing includes a reflection surface that reflects the ultrasonic waves, a waveguide through which the ultrasonic waves propagate, and an opening that is provided at one end of the waveguide and through which the ultrasonic waves pass.