MAGNETIC CIRCUIT HAVING MAGNETIC POCKET

摘要

PURPOSE: A magnetic circuit with a magnet pocket is provided to increase magnetic flux density by developing the magnet pocket which easily arranges a magnet which is attached to a yoke and to equally distributing the magnet. CONSTITUTION: A magnet pocket(10) arranges a plurality of magnet storage spaces(13) corresponding to an upper side of circumference of a body(11) which is attached to a yoke(31). A plate(33) is attached to an upper side of the magnet pocket. A voice coil(35) is located in a gap(32) between the yoke and the plate. A voice coil bobbin(34) winds a voice coil corresponding to outer periphery circumference.