ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,532,125, issued on Jan. 20, was assigned to ALPS ALPINE Co. LTD. (Tokyo).
"Speaker" was invented by Ryo Ito (Fukushima, Japan), Yuji Saito (Fukushima, Japan), Katsuhiko Egami (Fukushima, Japan) and Hiroki Toita (Fukushima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A magnetic circuit section having a main magnetic gap and sub-magnetic gaps is used. A vibrator is vibrated by an electromagnetic force generated by a voice current, which flows through a voice coil and a magnetic flux crossing the main magnetic gap. When the voice coil approaches or enters a sub-magnetic gap, the voice current which flows through the voice coil is reversed, tempora...