ALEXANDRIA, Va., June 9 -- United States Patent no. 12,289,591, issued on April 29, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Coaxial speaker" was invented by Zhang Ren (Shenzhen, China), Zhiwei Zhong (Shenzhen, China) and Wei Song (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a coaxial speaker including a supporting ring, a magnetic circuit system, a first vibration system, and a second vibration system. The second vibration system locates coaxially with the first vibration system. The first vibration system includes a first diaphragm and a first voice coil. The second vibration system includes a second diaphragm and a second voi...