US 12,464,295 B2
Air motion transformer transducer with closed-circuit magnet motor system
Onur I. Ilkorur, Santa Clara, CA (US); Christopher Wilk, Los Gatos, CA (US); and Martial A. Rousseau, Saratoga, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jan. 23, 2024, as Appl. No. 18/420,439.
Claims priority of provisional application 63/486,608, filed on Feb. 23, 2023.
Prior Publication US 2024/0292157 A1, Aug. 29, 2024
Int. Cl. H04R 23/00 (2006.01); H05K 5/00 (2006.01)
CPC H04R 23/00 (2013.01) [H05K 5/0086 (2013.01); H04R 2499/11 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transducer assembly comprising:
an air motion transformer having a magnet assembly operable to provide a magnetic field and a folded diaphragm having conductive traces and operable to expand or contract in a first direction and emit a sound in a second direction perpendicular to the first direction; and
a ferromagnetic assembly comprising a number of fixed members arranged within folds of the folded diaphragm.