ALEXANDRIA, Va., May 19 -- United States Patent no. 12,634,631, issued on May 19, was assigned to AAC Microtech (Changzhou) Co. Ltd. (Changzhou, China).
"Speaker" was invented by Chao Zhang (Changzhou, China) and Bo Peng (Changzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker includes a frame, a vibration system including a diaphragm and a voice coil driving the diaphragm to vibrate and emit sounds, and a magnetic circuit system. The diaphragm includes a dome and a suspension surrounding the dome, the dome includes a first dome and a second dome stacked on the first dome, the second dome is smaller than the first dome and a projection of the second dome along a vibration direction of the d...