ELECTROMAGNETIC TYPE SOUND PRODUCING BODY WITH VIBRATION MOTOR

摘要

PROBLEM TO BE SOLVED: To provide the entire part constitution of an electromagnetic sound producing body with a vibration motor having a large sound pressure in a vibration motor composed of the magnetic fields of permanent magnet pieces of the same magnetic polarities and an armature using one coil. SOLUTION: This electromagnetic type sound producing body 300 is constituted by disposing an upper yoke 304 which is magnetically engaged with the top surface of the permanent magnet piece on a lower yoke, a diaphragm drive section 303 on a diaphragm 302 disposed thereon and the armature 100 which has the one coil 111, is freely rotatable relative to the driving magnetic pole by forming a bias magnetic field in the slight gap with the driving magnetic poles disposed on the lower yoke and is magnetically determined of the stop position by the magnetic pole of the lower yoke and the head part of the needle- like terminal of a rectifier.