ALEXANDRIA, Va., Sept. 3 -- United States Patent no. 12,407,986, issued on Sept. 2, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Sounding device" was invented by Zhang Ren (Shenzhen, China) and Zhiwei Zhong (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure provides a sounding device having a first frame; a first vibration system including a first diaphragm and a first voice coil; and a magnetic circuit system with a first magnetic gap and a second magnetic gap. The sounding device further includes a second vibration system having a second diaphragm and a second voice coil, and a conductive insertion member. The total bending length of both ends ...