Patent ID: 11937061
Assignee: POLK AUDIO, LLC
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An audio speaker, comprising:
a frame;
a diaphragm operatively coupled to the frame;
a voice coil bobbin operatively coupled to the diaphragm, the voice coil bobbin having an interior lumen;
a magnetic circuit comprising a magnet, a first inner magnetic disk, a first outer magnetic disk positioned radially outside of the first inner magnetic disk, a pole piece, and a pole yoke positioned on an opposite side of the magnet relative to the first outer magnetic disk, the first inner magnetic disk and the first outer magnetic disk being separate from one another by a first gap region;
a voice coil positioned about and carried by the voice coil bobbin and extending within the first gap region between the first inner magnetic disk and the first outer magnetic disk, the voice coil being configured to convert an electric current into an electro-motive force for imparting vibrational movement to the voice coil bobbin and the diaphragm; and
a spacer comprising an inner spacer member adjacent to the first inner magnetic disk and an outer spacer member adjacent to the first outer magnetic disk, the inner spacer member defining a plurality of first lumens and the outer spacer member defining a plurality of second lumens.