Acoustics – Plural diaphragm sound sources
Patent
1981-12-16
1983-12-20
Fuller, Benjamin R.
Acoustics
Plural diaphragm sound sources
181155, 181156, 181199, 181175, H05K 500
Patent
active
044212003
ABSTRACT:
An enclosure for transducers incorporates an interior acoustically reflective shell. This acoustically reflective shell is shaped so that the inner surface thereof is the envelope of at least a section of a cylinder of elliptical cross section, an ellipsoid of revolution, or the envelope of a multitude of said shapes oriented so that the elliptical shapes share one common focus and each has one distinct focus. In this last case, transducers are placed at the distinct foci so that sound produced by them is directed substantially toward that portion of the elliptical acoustically reflective shell to which the distinct foci belong. In operation sound generated by the transducers, operating in phase with one another, is focused and concentrated at the common focus such that this common focus acts as a singular source of phase coherent sound of any desired angular beamwidth and intensity. If the acoustically reflective shell consists of a section of a single elliptical shape, a transducer is placed at one focus oriented so that either front or rear generated sound is directed substantially toward the elliptical shape, reflected and focused at the other focal point. Sound emanating from this second focal point may be phase coherent, and have angular beamwidth and intensity as desired.
REFERENCES:
patent: 1619981 (1927-03-01), Knut
patent: 1716199 (1929-06-01), Von Hofe et al.
patent: 1786279 (1930-12-01), Wolff
patent: 2643727 (1953-06-01), Leon
patent: 2732907 (1956-01-01), Leon
Ferralli Michael W.
Moulton David R.
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