HEARING AID COMPATIBLE MOBILE SPEAKER
A speaker including a single coil for both normal voice and for creating an HAC field. A large coil may be provided in combination with a strong magnet. The components of the speaker may be designed so as to maximize the space available for the voice coil and for the magnet.
1 . A speaker for a mobile device capable of providing hearing aid compatibility, the speaker comprising:
a coil;
a membrane coupled to the coil;
a first magnet and a second magnet spaced apart from each other disposed so as to create a magnetic field between the first and second magnets through which the coil may propagate; and
a magnetically-conductive pot supporting the first and second magnets, the pot comprising a generally planar inner surface that is parallel with the membrane and a plurality of retaining members, the retaining members being unitary with the inner surface and extending orthogonally from the inner surface so as to restrain at least one of the first and second magnets.
2 . The speaker of claim 1 , wherein the first magnet comprises a central magnet and the second magnet comprises a first lateral magnet, further comprising a second lateral magnet, wherein the coil is disposed so as to propagate between the central magnet and the two lateral magnets, wherein each of the two lateral magnets is restrained by a respective two or more of the retaining members.
3 . The speaker of claim 1 , further comprising a basket assembly, the basket assembly comprising a plastic body and an electrical contact portion, the electrical contact portion electrically coupled with the coil and extending around an exterior portion of the basket assembly.
4 . The speaker of claim 3 , wherein the electrical contact portion comprises an injection-molded metal.
5 . The speaker of claim 4 , wherein the electrical contact portion comprises steel.
6 . The speaker of claim 1 , wherein the pot further comprises:
a generally planar outer surface that is parallel with the membrane and one or more indents in the outer surface, each of the one or more indents surrounding a ventilation port in the pot configured to permit the flow of air displaced by movement of the membrane; and
a mesh disposed within each of the one or more indents so as to cover the ventilation port surrounded by the indent.
7 . The speaker of claim 1 , wherein the inner surface of the pot is disposed on a first side of the first or second magnet, wherein the speaker further comprises one or more top plates, disposed on a second side of the first or second magnet that is opposite the first side and in contact with one or more of the retaining members.
8 . The speaker of claim 7 , wherein each of the one or more top plates comprises the same materials as the pot.
9 . The speaker of claim 1 , wherein the pot comprises six or more retaining members.
10 . The speaker of claim 1 , wherein the inner surface of the pot is disposed on a first side of the first magnet and a first side of the second magnet, the speaker further comprising:
a first top plate disposed on a second side of the first magnet; and
a second top plate disposed on a second side of the second magnet, wherein the second top plate is in contact with one or more of the retaining members.
11 . The speaker of claim 10 , wherein the second top plate is in contact with two of the retaining members.
12 . The speaker of claim 11 , wherein the two retaining members with which the second top plate is in contact restrain lateral and longitudinal movement of the second top plate.
13 . The speaker of claim 11 , wherein the second magnet is in contact with the same two retaining members as the second top plate.
14 . The speaker of claim 2 , wherein an inner surface of the pot is disposed on a first side of the central magnet, a first side of the first lateral magnet, and a first side of the second lateral magnet, the speaker further comprising:
a central top plate disposed on a second side of the central magnet;
a first lateral top plate disposed on a second side of the first lateral magnet; and
a second lateral top plate disposed on a second side of the second lateral magnet;
wherein the first lateral top plate is in contact with one or more of the retaining members and the second lateral top plate is in contact with a different one or more of the retaining members.
15 . The speaker of claim 14 , wherein the first lateral top plate is in contact with two retaining members that restrain lateral and longitudinal movement of the first lateral top plate and the second lateral top plate is in contact with a different two contact members that restrain lateral and longitudinal movement of the second lateral top plate.