Acoustic apparatus

Details Acoustic apparatus Acoustic apparatus

1993-04-09

1993-12-07

Gellner, Michael L.

Acoustics

Diaphragm and enclosure

Reflector baffle

181 30, 181199, 352 35, H05K 500, E04B 199, A47B 8106, G03B 3100

Patent

active

052685390

ABSTRACT:
An acoustic apparatus adapted to be heard only by a specific person or persons in one space without being worn by the user as in the case of an earphone. Sounds issuing from the apparatus do not leak to the outside and are not affected by the surrounding noise. Basically, the apparatus is arranged such that a sound source is disposed in one focus of a reflector having an ellipsoidal surface of revolution, and sounds are heard at the other focus. To increase the number of specific hearers, if the central portion of the reflector is made into a non-ellipsoidal surface of revolution, or a cross section having an ellipsoidal surface of revolution is extended orthogonally to the cross section by a predetermined length, the range of the other focus expands. In addition, by arranging a plurality of reflectors, it is possible to hear different sounds within the effective areas of the respective reflectors without mutual interference of the sounds.

REFERENCES:
patent: 965326 (1910-07-01), Prescott
patent: 1120858 (1914-12-01), Stallforth
patent: 3944757 (1976-03-01), Tsukamoto
patent: 4629030 (1986-12-01), Ferralli et al.
patent: 4836328 (1989-06-01), Ferralli
patent: 4844198 (1989-07-01), Ferralli

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