ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,407,975, issued on Sept. 2, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Coaxial speaker" was invented by Zhang Ren (Shenzhen, China), Zhiwei Zhong (Shenzhen, China) and Qi Wang (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a coaxial speaker including a frame, a magnetic circuit system, a first vibration system and a second vibration system fixed on different sides of the magnetic circuit system. The first vibration system locates communicated with the second vibration system. The first vibration system includes a first diaphragm and a first voice coil. The second vibration syst...