ALEXANDRIA, Va., April 2 -- United States Patent no. 12,267,660, issued on April 1, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker" was invented by Yang Shi (Shenzhen, China) and Shuwen Wu (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker includes: a frame, a vibration system, including a diaphragm, a voice coil, and a flexible circuit board, the flexible circuit board including a first fixing portion, a second fixing portion, and an elastic arm, and a magnetic circuit system, including a yoke with a through hole and a main magnet and a secondary magnet fixed to the yoke, the secondary magnet surrounding and spaced from the main magnet for forming a ma...