ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,477,281, issued on Nov. 18, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker" was invented by Jinming Li (Changzhou, China) and Zhizhu Chen (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a speaker includes a frame, a vibration system, and a magnetic circuit system. The vibration system includes a diaphragm, a voice coil assembly, and a printed circuit board. The printed circuit board is arranged on both sides of the speaker. The magnetic circuit system includes a magnetic bowl and a magnet assembly. The printed circuit board includes a first fixing portion mounted with the f...