US 11,678,123 B2
Electromagnetic actuator for a speaker or a sound transducer with a high-strength metal connection between the voice coil and the magnet system
Gustav Otto, Vienna (AT); Markus Trampert, Vienna (AT); Stefan Gebhardt, Vienna (AT); Andreas Hintennach, Vienna (AT); Manuel Mefleh, Vienna (AT); and Ernst Tomas, Strasshof an der Nordbahn (AT)
Assigned to Sound Solutions International Co., Ltd., Beijing (CN)
Filed by Sound Solutions International Co., Ltd., Beijing (CN)
Filed on May 19, 2021, as Appl. No. 17/325,046.
Claims priority of application No. A 50442/2020 (AT), filed on May 20, 2020.
Prior Publication US 2021/0368277 A1, Nov. 25, 2021
Int. Cl. H04R 9/06 (2006.01); H04R 9/04 (2006.01); H04R 9/02 (2006.01)
CPC H04R 9/06 (2013.01) [H04R 9/025 (2013.01); H04R 9/046 (2013.01)] 25 Claims
OG exemplary drawing
 
1. Electrodynamic actuator, which is designed to be connected to a backside of a plate structure or membrane opposite to a sound emanating surface of the plate structure or the membrane and which comprises
at least one voice coil, which has an electrical conductor in a shape of loops running around a coil axis in a loop section, and
a magnet system being designed to generate a magnetic field transverse to the electrical conductor in the loop section and
an arm arrangement of a plurality of arms connecting the at least one voice coil and
a) the magnet system and allowing a relative movement between the at least one voice coil and said magnet system in an excursion direction parallel to the coil axis or
b) a movable part of the magnet system and allowing a relative movement between the at least one voice coil and said movable part of the magnet system in an excursion direction parallel to the coil axis,
wherein
the plurality of arms are made of a metal with a fatigue strength of at least 370 N/mm2 or an ultimate tensile strength of at least 1100 N/mm2.