Loudspeakers

Details Loudspeakers Loudspeakers

1992-12-07

1998-02-24

Le, Huyen D.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381204, 181157, H04R 2500

Patent

active

057217866

ABSTRACT:
An improved loudspeaker comprises an oscillator fitted to an enclosure and able to oscillate to create sound waves. The oscillator, which includes a diaphragm, may be driven in response to an electromagnetic force or passively in response to pressures in the enclosure. The oscillator includes a convoluted tubular chamber which is preferably coiled in a helix about the center of the oscillator. The chamber may be open to the interior of the enclosure and to the exterior of the enclosure. The oscillator should provide a surface area in contact with air in excess to that provided by the diaphragm alone. In a preferred embodiment the baffle forms a framework between two diaphragm membranes,one of which membranes is open centrally to allow access to the center of the baffle and thus to the chamber.

REFERENCES:
patent: 2704185 (1955-03-01), Tavares
patent: 4198550 (1980-04-01), Matsuda et al.
patent: 4259550 (1981-03-01), Nakamatsu
patent: 4517416 (1985-05-01), Goossens
patent: 4618025 (1986-10-01), Sherman
patent: 4764968 (1988-08-01), Kreitmeier
patent: 4905788 (1990-03-01), Lanternier
patent: 5009280 (1991-04-01), Yokoyama
patent: 5231672 (1993-07-01), Tsao

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