Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2011-08-30
2011-08-30
Enad, Elvin G (Department: 2832)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S182000, C381S184000, C381S186000, C381S396000, C381S424000, C381S432000, C181S163000, C029S594000
Reexamination Certificate
active
08009858
ABSTRACT:
A loudspeaker including a frame and a toroidal magnet that is affixed to the rear of the frame. The toroidal magnet has a central passageway that opens into the frame. A cap is affixed to the rear of the magnet and closes the central passageway. A guide rod is affixed to the cap and projects forwardly from the cap into the central passageway. A tubular former is slidably positioned upon the guide rod. A voice coil is wound about, and is affixed to, the tubular former. A driver plate is affixed to the front of the tubular former. A resilient surround connects the periphery of the driver plate to the front of the frame. A suspension assembly resiliently connects the tubular former to the frame and has a pair of conical diaphragms that are secured together so as to form a bellows. A spider connects the bellows to the frame and another spider connects the bellows to the tubular former.
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Enad Elvin G
Greiner Stephen R.
Russell Christina
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