Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent
1992-06-05
1995-02-14
Isen, Forester W.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having electrostatic element
381194, 381204, H04R 2500
Patent
active
053902572
ABSTRACT:
Disclosed is a lightweight loudspeaker assembly comprising a high efficiency permanent magnet structure that is comprised of a rare earth metal magnet, preferably a neodymium-iron-boron magnet and an enclosure means for said permanent magnet comprised of a magnetic flux carrying material, such as steel. The magnet structure contains a small gap which accommodates a high impedance voice coil to which there is attached a cone diaphragm. The loudspeaker assembly contains a frame which supports the cone diaphragm and the permanent magnet structure. The frame is preferably comprised of a lightweight material, such as aluminum or magnesium or their alloys, a plastic material or a lightweight composite material. The loudspeaker assembly can optionally also contain a bucking magnet that is located in close proximity to the permanent magnet. Unconventionally, the bucking magnet is smaller in size and magnetic flux than the permanent magnet. The bucking magnet may be comprised of a magnetic material other than what is used in the permanent magnet structure. Optionally, the loudspeaker assembly can contain an integral resistor network, on a printed circuit board, which is in electrical communication with the voice coil.
REFERENCES:
patent: 3917914 (1975-11-01), Parker
patent: 3937904 (1976-02-01), Parker
patent: 4628154 (1986-12-01), Kort
patent: 4657108 (1987-04-01), Ward
patent: 4685448 (1987-08-01), Shames et al.
Moskow Harry J.
Oslac Michael J.
Isen Forester W.
Tran Sinh
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