Chen, Y.-C.Y.-C.ChenKo, W.-C.W.-C.KoChen, H.-L.H.-L.ChenWu, W.-J.W.-J.WuChang, P.-Z.P.-Z.ChangWEN-JONG WUCHIH-KUNG LEEPEI-ZEN CHANG2020-01-172020-01-172012https://scholars.lib.ntu.edu.tw/handle/123456789/452002An electromechanically actuated electret-based loudspeaker made with an organic material membrane is presented, which is small in volume, extremely thin, and lightweight for light vehicle applications. As obtaining good sound quality in a vehicle is a complicated and difficult task, the electrostatic thin-film actuator can be cut into any shape and then assembled into an electret-based loudspeaker for placement at any location within the vehicle. The sound field in a vehicle can be optimized by properly tailoring the electret-based loudspeaker performance and choosing the most appropriate location for the loudspeaker for optimal sound performance. In addition, it is possible to design a novel 3-D sound field. Our newly fabricated 100-mm-by-100-mm electret loudspeaker weighs only 4 g and is 1 mm thick. It only consumes 0.15 mW to generate a sound pressure level at 88 dB at 1 kHz, which is very energy efficient for electric car applications. In summary, our newly flexible electret-based loudspeaker has tremendous potential for future automotive applications due to its excellent advantages over current vehicle loudspeakers. © 2011 IEEE.[SDGs]SDG7Automotive applications; Energy efficient; Light vehicles; Organic materials; Over current; Sound pressure level; Sound Quality; Acoustic devices; Acoustic field measurement; Acoustic fields; Actuators; Automobile electronic equipment; Automobiles; Electrets; Electrostatic actuators; Energy efficiency; Loudspeakers; Optimization; Vehiclesjournal article10.1109/TIE.2011.21745392-s2.0-84862983426https://www.scopus.com/inward/record.uri?eid=2-s2.0-84862983426&doi=10.1109%2fTIE.2011.2174539&partnerID=40&md5=86b7edc0f79b7f61bc8cc97243dff5fe