Loudspeaker has frame, magnetic circuit, voice coil, diaphragm, first combination and second combination. First combination and second combination are both provided closer to magnetic circuit than diaphragm, the inner rims of which are connected to voice coil while the outer rims are to frame. First combination has first damper and first edge wherein first edge has first edge protrusion protruding in a direction toward diaphragm. Second combination has second damper and second edge wherein second edge has second edge protrusion protruding in an opposite direction to the protruding direction of first edge protrusion This structure obtains loudspeaker that distortion is suppressed and weight reduction is easy for an excursion part thus improved in driving efficiency.
1. A loudspeaker comprising:
a frame
a magnetic circuit supported by the frame and for forming a magnetic gap;
a voice coil arranged movable relative to the magnetic gap;
a diaphragm having an outer rim connected to the frame via a diaphragm edge and an inner rim connected to the voice coil;
a first combination provided closer to the magnetic circuit than the diaphragm and having a first damper and a first edge, thus having an inner rim connected to the voice coil and an outer rim connected to the frame; and
a second combination provided closer to the magnetic circuit than the diaphragm and having a second damper and a second edge, thus having an inner rim connected to the voice coil and an outer rim connected to the frame,
the first edge having a first edge protrusion protruding in a direction toward the diaphragm or in a direction opposite to the diaphragm, and
the second edge having a second edge protrusion protruding in a direction opposite to the protruding direction of the first edge protrusion,
wherein the first combination has a Young's modulus and the second combination has a Young's modulus that is greater than a Young's modulus of the diaphragm edge,
the first edge has a Young's modulus smaller than a Young's modulus of the second edge,
the first edge has a Young's modulus greater than a Young's modulus of the diaphragm edge, and
a connection between the first damper and the first edge has a Young's modulus greater than a Young's modulus of the first damper and a Young's modulus of the first edge, and
a connection between the second damper and the second edge has a Young's modulus greater than a Young's modulus of the second damper and a Young's modulus of the second edge.
2. The loudspeaker of claim 1 , wherein the first damper and the second damper are both connected to the voice coil,
the first edge and the second edge being both connected to the frame.
3. The loudspeaker of claim 2 , wherein the first combination has a third damper provided between the first edge and the frame,
the second combination having a fourth damper provided between the second edge and the frame.
4. The loudspeaker of claim 1 , wherein the first damper and the second damper are both connected to the frame,
the first edge and the second edge being both connected to the voice coil.
5. The loudspeaker of claim 1 , wherein the first edge is formed by use of foam rubber while the second edge is formed by use of rubber material.
6. The loudspeaker of claim 5 , wherein the diaphragm edge and the first edge are formed by use of foam urethane resin.