Electrodynamic transducer e.g. loudspeaker, for generating sound waves, has confinement units to confine magnetic field in gap to form bilateral seals in gap for guiding coil and forming pneumatic seal between front and rear faces of dome

摘要

#CMT# #/CMT# The transducer has an electrodynamic motor with a coil (6) supported by a mandrel (3). The mandrel is connected to a dome (2) suspended from a frame (7) e.g. basket assembly. The coil is disposed in a gap, in which the coil is defined at a centre by an inner magnetic structure (4) and at periphery by an outer magnetic structure (5). Confinement units (11) confine magnetic field in the gap to form tiered bilateral seals (12) in the gap using a ferromagnetic liquid for guiding the coil and forming a pneumatic seal between the front and rear faces of the dome. #CMT#USE : #/CMT# Transducer e.g. loudspeaker, geophone or microphone for generating sound waves based on current. #CMT#ADVANTAGE : #/CMT# The confinement units confine the magnetic field in the gap to form seals in the gap for guiding the coil and forming a pneumatic seal between the front and rear faces of the dome, thus avoiding a suspension unit required for guiding the coil and ensuring sealing functions. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a vertical sectional view of a loud-speaker. 2 : Dome 3 : Mandrel 4 : Inner magnetic structure 5 : Outer magnetic structure 6 : Coil 7 : Frame 11 : Confinement units 12 : Bilateral seals.