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1. (WO2018056814) LOUDSPEAKER UNIT WITH MULTIPLE DRIVE UNITS

Pub. No.:    WO/2018/056814    International Application No.:    PCT/NL2017/050627
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Fri Sep 22 01:59:59 CEST 2017
IPC: H04R 9/06
H04R 9/02
H04R 9/04
Applicants: TECHNISCHE UNIVERSITEIT DELFT
Inventors: SCHEEK BSC. IR. , Mattias Jeffrey
SCHEEK MA, Timothy Ruben
Title: LOUDSPEAKER UNIT WITH MULTIPLE DRIVE UNITS
Abstract:
Loudspeaker unit with a membrane (2) and a plurality of drive units (5) driving the membrane (2). Each of the plurality of drive units (5) has n voice coils (3) and at least n+1 magnets (4), n being an integer larger than or equal to 1. The magnets (4) have an axial magnetization and are stacked in axial direction with similar pole parts of adjacent ones of the at least n+1 magnets facing each other. The at least n+1 magnets (4) are separated in the stack over a magnet separation distance (dm), the magnet separation distance (dm) being substantially equal to a width (ws) in the stack direction of the at least n voice coils (3).