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US 6,639,992 B2Granted
Multifunction acoustic device
AssigneeCitizen Electronics Co., Ltd.
InventorsTakashi Kobayashi, Akira Nikaido, Kenshi Aihara
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Abstract
A speaker diaphragm is supported in a frame and a voice coil is secured to the speaker diaphragm. A rotor having a central permanent magnet and a cylindrical hub provided around the central permanent magnet is rotatably supported in the frame. A motor annular permanent magnet is disposed around the rotor. The voice coil is disposed in the gap formed between the central permanent magnet and the hub.
Claims6
A multifunction acoustic device comprising:
- a frame;
- a speaker diaphragm supported in the frame;
- a voice coil secured to the speaker diaphragm;
- a rotor having a central permanent magnet and a cylindrical hub provided around the central permanent magnet, and rotatably supported in the frame;
- a motor annular permanent magnet disposed around the rotor;
- the voice coil being disposed in the gap formed between the central permanent magnet and the hub.
3 more elements
Dependencies are inferred from the claim text.