Earphone driver and method of manufacture

A balanced armature motor assembly has a circuit board mounted to a bobbin. A first end of a wire coil is secured to a first terminal on the circuit board and passes through a first cutout of the bobbin. A second end of the wire coil is secured to a second terminal on the circuit board and passes th...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	GRINKER, SCOTT CHARLES, NOETTL, DONALD DAVID
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INDUCTANCES LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MAGNETS PUBLIC ADDRESS SYSTEMS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TRANSFORMERS
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Beschreibung
Zusammenfassung:	A balanced armature motor assembly has a circuit board mounted to a bobbin. A first end of a wire coil is secured to a first terminal on the circuit board and passes through a first cutout of the bobbin. A second end of the wire coil is secured to a second terminal on the circuit board and passes through a second cutout of the bobbin. The first end of the wire coil is oriented along a first line tangent to a center post of the bobbin, and the second end of the wire coil is oriented along a second line tangent to the center post of the bobbin. In another embodiment, a compressed polymer material is interposed between a first magnet and a post located on the bobbin and between a second magnet and the post on the bobbin. The polymer material forces the first and second magnets into contact with the pole piece such that the magnets can be welded to the pole piece.