Foster Electric Company, Limited

Rintaro Kohara

Takeshi Yoshimura

Hidetoshi Shirakawa

A loudspeaker has two magnets disposed directly with respect to voice coils for generating a repulsion magnetic field at the voice coils, without interposition of yoke but with mutually repulsing magnetic polarities of the magnets, and a diaphragm directly coupled at inner peripheral edge substantially to the center of outer periphery of the voice coils. Driving force is transmitted highly efficiently from the voice coils to the diaphragm, and the loudspeaker can be sufficiently minimized in the thickness and weight.

Growing community of inventors

Akishima, Japan

Rintaro Kohara