Signal-horn
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United States of America Patent
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-
Jun 22, 2004
Grant Date -
Jul 24, 2003
app pub date -
Nov 25, 2002
filing date -
Feb 4, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A signal-horn has an electromagnetically actuated oscillating membrane coupled to an acoustic amplifier having a volute wound duct formed of a first length with generally constant section having an inlet for the sound signal and a second length with variable section in the form of a conical exponential having an outlet for the sound signal. The ratio of the figure representing the volume defined by the oscillating membrane between two points of maximum elongation and the figure representing the area of the cross section of the first length is between 16 and 20.
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