STEREOSCOPIC STRUCTURE VOICE COIL BOBBIN

摘要

PURPOSE:To obtain a structure minimizing the degree of disturbance to magnetic field by connecting a voice coil bobbin and a sub voice coil bobbin with reinforcement ribs arranged radially and engraving slits to a center pole. CONSTITUTION:A stereoscopic structure coil bobbin is mounted in a way that it just bores into the center pole 6. As a result, the voice coil bobbin has a high strength in stereoscopic structure and a part of the bobbin placed between the center pole 6 and a plate 9 keeps a thin thickness unchanged from that of a conventional bobbin. In causes the voice coil bobbin to provide a property hardly disturbing the magnetic field between the center pole 6 and the plate 9 naturally.