US 12,245,001 B2
Wireless charging with magnetic retention
Jonathan Sarjeant Aase, Incline Village, NV (US); and David Whitington, South Lake Tahoe, CA (US)
Assigned to Eargo, Inc., San Jose, CA (US)
Filed by Eargo, Inc., San Jose, CA (US)
Filed on Jun. 30, 2022, as Appl. No. 17/854,563.
Claims priority of provisional application 63/217,114, filed on Jun. 30, 2021.
Prior Publication US 2023/0007412 A1, Jan. 5, 2023
Int. Cl. H04R 25/00 (2006.01); H02J 50/10 (2016.01)
CPC H04R 25/656 (2013.01) [H02J 50/10 (2016.02); H04R 25/50 (2013.01); H04R 25/554 (2013.01); H04R 25/65 (2013.01); H04R 25/654 (2013.01); H04R 25/658 (2013.01); H04R 2225/025 (2013.01); H04R 2225/31 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a magnet in a wireless charger and a ferromagnetic target plate in a hearing assistance device are configured to create a magnetic retention force to hold the hearing assistance device in place when charging in order to control an amount of interference with a wireless charging between the wireless charger and the hearing assistance device, as well as
a housing for the wireless charger has one or more storage areas, where contours of the storage areas each conform to a shape of the hearing assistance device, where the magnet in the wireless charger and the ferromagnetic target plate in each hearing assistance device are positioned relative to a charging coil in the wireless charger and a receive coil in the hearing assistance device such that a first magnetic field supplied from the magnet to cause the magnetic retention force of the hearing assistance device to be controlled to not significantly interfere with a second magnetic field causing the wireless charging between the charging coil in the wireless charger and the receive coil in the hearing assistance device.