Research on Capacitive Micromachined Ultrasonic Transducer Array for the Wrist-Type Suspension Control System

This research is to develop a wrist-type suspension control system, which uses a capacitive micromachined ultrasonic transducer (CMUT) to achieve the effect of suspension and non-touch control. The use of polymer-based ultrasonic transducers has the advantages of non-touch, flexibility, transparency, and thinness. It can be made into a wrist device and use an ultrasonic signal to transmit and receive to achieve non-touch control effects. It can be applied to smartwatches. Since the existing touch screen is limited by the size of the finger, the surface cannot be viewed during use, resulting in accidental touch. This suspension control method can be operated without touching the surface. The non-touch method is more convenient. In this study, a 4 × 3 array of numeric keyboards was made by using different frequencies of ultrasonic signals to represent commonly used numbers and symbols, to avoid interference caused by reflective surfaces during operation.