ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,532,126, issued on Jan. 20, was assigned to PANASONIC AUTOMOTIVE SYSTEMS Co. LTD. (Kanagawa, Japan).
"Electroacoustic conversion device" was invented by Satoshi Itoh (Osaka, Japan), Takayuki Dan (Mie, Japan) and Shinya Kagawa (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electroacoustic conversion device including a diaphragm, an inner voice coil attached to the diaphragm, an outer bobbin disposed in a periphery of the inner voice coil to surround the inner voice coil, an outer voice coil attached to the outer bobbin; a magnetic circuit, and a frame that holds the diaphragm and the magnetic circuit. The outer bobbin includes a pluralit...