HIGH EFFICIENT ELECTROMAGNET SLIM SPEAKER USING CLOSED-LOOP MAGNETIC CIRCUIT

摘要

A ferromagnetic body metal piece is attached to top and bottom parts of two permanent magnets placed on a side of a vibrator and including a north polar and a south polar in order to form a permanent magnet magnetic circuit with a closed-loop. An electromagnet slim speaker using a closed-loop magnetic circuit is composed to vibrate the vibrator which becomes an electromagnet according to a direction of a current by the south polar and the north polar of the permanent magnets and mutual gravitation or repulsive force as the magnetic flux of the electromagnet and the permanent magnets is collected in the vibrator by forming a closed-loop having a narrow cap of the permanent magnets and a path of an electromagnet magnetism line generated by the current by using an E-type vibrator.