US 11,706,570 B2
Dual-diaphragm moving-coil audio transducer for hearing device
Mohammad Mohammadi, Rolling Meadows, IL (US); and Christopher Lane Monti, Elgin, IL (US)
Assigned to Knowles Electronics, LLC, Itasca, IL (US)
Filed by Knowles Electronics, LLC, Itasca, IL (US)
Filed on Aug. 17, 2021, as Appl. No. 17/404,902.
Prior Publication US 2023/0057158 A1, Feb. 23, 2023
Int. Cl. H04R 9/02 (2006.01); H04R 7/16 (2006.01); H04R 1/10 (2006.01)
CPC H04R 9/025 (2013.01) [H04R 1/1091 (2013.01); H04R 7/16 (2013.01); H04R 2460/11 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.