ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,477,283, issued on Nov. 18, was assigned to Yamaha Corp. (Hamamatsu, Japan).
"Speaker unit" was invented by Azumi Yoshida (Hamamatsu, Japan), Tsukasa Suenaga (Iwata, Japan) and Tsunenori Sano (Hamamatsu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A speaker unit includes a yoke, a magnet, a voice coil and a partitioner. The yoke includes a base portion and a protruding portion protruding from the base portion. The magnet is disposed on the base portion. The top plate is disposed on the magnet. A magnetic gap is formed between the top plate and the protruding portion. The voice coil is disposed in the magnetic gap. The partitioner is disposed in...