Patent ID: 11924621
Assignee: PSS BELGIUM NV
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A loudspeaker including:
a diaphragm having a front surface facing in a forward direction for producing sound to be radiated outwardly from the loudspeaker in the forward direction and a back surface facing in a backward direction that is opposite to the forward direction;
a magnet unit configured to provide magnetic field in a magnetic gap, wherein the magnetic gap is located between a first portion of the magnet unit located radially inwards of the magnetic gap with respect to a longitudinal axis of the loudspeaker and a second portion of the magnet unit located radially outwards of the magnetic gap with respect to the longitudinal axis of the loudspeaker;
a voice coil, configured to sit in the magnetic gap when the diaphragm is in a rest position, and is further configured to produce a magnetic field in use which interacts with the magnetic field provided by the magnet unit in the magnetic gap so as to move the diaphragm along the longitudinal axis of the loudspeaker;
wherein the height of the voice coil in the direction of the longitudinal axis of the loudspeaker is less than the height of the magnetic gap in the direction of the longitudinal axis of the loudspeaker;
wherein the voice coil is rigidly connected to the diaphragm via a rigid connector, wherein the rigid connector includes ribs which extend radially outwardly from the voice coil through slits in the second portion of the magnetic unit;
wherein the first portion of the magnet unit and the second portion of the magnet unit are configured such that magnetic flux density of the magnetic field in the magnetic gap reaches a first local maximum at a first peak location along the longitudinal axis of the loudspeaker and a second local maximum at a second peak location along the longitudinal axis of the loudspeaker, wherein the first peak location and the second peak location are separated spatially in the direction of the longitudinal axis of the loudspeaker by a valley region in which the magnetic flux density is lower than both the first local maximum and the second local maximum, wherein the voice coil is configured to be positioned in the valley region when the diaphragm is in its rest position.