@article{WANG2011, 
author = {Yufeng WANG and Yi YANG and Xiangming KONG and Wenjun LIAO and Ligang WANG and Tianling REN and Litian LIU},
title = {Handwriting Input System Based on Ultrasonic Transducers},
year = {2011},
journal = {Tsinghua Science and Technology},
volume = {16},
number = {3},
pages = {290-294},
keywords = {collinear transducers, PVDF, driver and detection circuit, handwriting input system},
url = {https://www.sciopen.com/article/10.1016/S1007-0214(11)70042-6},
doi = {10.1016/S1007-0214(11)70042-6},
abstract = {A handwriting input system was developed using three collinear ultrasonic transducers. These collinear polyvinylidene fluoride (PVDF) transducers were specially designed for the handwriting input system to give a large writeable area with writing in any direction. Driver and detection circuits were developed for the handwriting system. This handwriting input system based on 2-dimensional position tracing has large writeable area (A4 paper), low drive voltage (5 V), and is independent of the handwriting pad or the pen.}
}