BIDIRECTIONAL SPEAKER OF PORTABLE TERMINAL

摘要

PURPOSE: A bidirectional speaker of a portable terminal is provided, which has an air path in a magnetic circuit. CONSTITUTION: A frame(10) has a space part(10a) where a sound output hole(10b) is formed. A magnet(14) is accommodated in the space part of the frame, and has a penetration hole(14a) connected to the sound output path. A top plate(16) is attached to the magnet, and has a penetration hole(16a) connected to the penetration hole of the magnet. A diaphragm(18) is attached to the front of the frame. And a voice coil(20) is attached to the inside of the diaphragm and is arranged closely to the magnet. The penetration hole and the sound output path form an air path(30), which makes smooth air flow when the diaphragm vibrates.