Use of energy trapping type piezoelectric transducer to suppress lateral vibration in the transducer

Abstract

Vibration characteristics of two types of piezoelectric transducers with whole-surface electrode and a partially electrode were driven in the thickness direction in air and water acoustic loading on the acoustic radiation surface. Partial electrode transducers had an acoustic loading on the side surface, which is called "siding". Use of partial electrode transducer allowed the lateral vibration on the acoustic radiation surface to be flattened, and thickness vibration becomes almost uniform. Schlieren observation and wavenumber analysis indicate that lateral waves were identified as Lamb waves. An A1 mode Lamb wave is given as a sample to verify the usefulness of this method.

Friction-varying tactile display with large working space for texture reproduction

“…Based on the squeeze film effect, the touch tablet should work at high-frequency vibration, thus, to change the contact frictional force between the finger and touch tablet. P-51 piezoelectric ceramics were pasted on the back of the touch tablet as the executor of vibration due to their high response rate and piezoelectric strain constant [22,23,24,25,26].…”