Dual-diaphragm moving-coil audio transducer for hearing device
AssigneeKnowles Electronics, LLC
InventorsMohammad Mohammadi, Christopher Lane Monti
Life of this patent
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Abstract
The present disclosure relates to dual-diaphragm moving-coil audio transducers for hearing devices. The transducer includes a magnetic circuit including an inner portion located between first and second coils coupled to corresponding diaphragms supported by a housing. An outer portion of the magnetic circuit is adjacent outer portions of the first and second coils. The transducer emits sound when the first diaphragm moves in a first direction and the second diaphragm moves in a second direction, opposite the first direction, in response to an electrical audio signal applied to the first and second coils.
Claims20
An audio transducer comprising:
- a first diaphragm comprising a first paddle movably coupled to a first frame by a first flexible member, the first diaphragm comprising a first coil coupled to the first paddle;
- a second diaphragm comprising a second paddle movably coupled to a second frame by a second flexible member, the second diaphragm comprising a second coil coupled to the second paddle, an inner portion of the first coil at least partially aligned with an inner portion of the second coil;
- a magnetic circuit comprising an inner portion at least partially disposed between and within perimeters of the first coil and the second coil, an outer portion adjacent to outer portions of the first coil and the second coil, and a permanent magnet,
- wherein the first diaphragm moves in a first direction and the second diaphragm moves in a second direction, opposite the first direction, in response to electrical excitation of the first coil and the second coil.
An audio transducer comprising:
- a first diaphragm coupled to a first coil;
- a second diaphragm coupled to a second coil;
- a magnetic circuit comprising an inner portion at least partially disposed between and within perimeters of the first coil and the second coil, the magnetic circuit comprising an outer portion disposed at least partially about and adjacent to outer portions of the first coil and the second coil, and a permanent magnet;
- a sound passage extending from a volume between the first and second diaphragms through an opening in the outer portion of the magnetic circuit,
- wherein the first diaphragm moves in a first direction and the second diaphragm moves in a second direction, opposite the first direction, in response to electrical excitation of the first coil and the second coil.
An audio transducer comprising:
- a housing;
- a first diaphragm coupled to a first coil, the first diaphragm and the first coil at least partially disposed in the housing;
- a second diaphragm coupled to a second coil, the second diaphragm and the second coil at least partially disposed in the housing;
- a magnetic circuit disposed in the housing and comprising a permanent magnet, an inner portion of the magnetic circuit at least partially disposed between and within perimeters of the first coil and the second coil, an outer portion of the magnetic circuit disposed at least partially about and adjacent to outer portions of the first coil and the second coil, the outer portion of the magnetic circuit forming a portion of the housing;
- wherein the first diaphragm moves in a first direction and the second diaphragm moves in a second direction, opposite the first direction, in response to electrical excitation of the first and second coils.
Dependencies are inferred from the claim text.