Sound generating transducer

Details Sound generating transducer Sound generating transducer

2006-02-07

2006-02-07

Nguyen, Tai T. (Department: 2632)

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

C340S384600, C340S388100, C340S388400, C340S392400, C340S384100, C381S345000, C381S351000, C381S424000

Reexamination Certificate

active

06995659

ABSTRACT:
A sound transducer comprises at least one sound unit based on at least one radially sound emitting diaphragm arranged in a substantially cylindrical or tubular form, the diaphragm including electromechanically converting material capable of creating sound by changing its physical state upon electrical excitation. In a single sound unit the diaphragm is arranged to be supported between an inner sound guiding sleeve and an outer sound guiding sleeve in order to form at least one axial acoustic channel between the diaphragm and at least one of the sleeves. At least at the exit side of the acoustic channel the axial ends of the diaphragm and the corresponding sound guiding sleeve are arranged to have mutual non-alignment in the plane perpendicular to the axis of the sound unit in order to reduce the acoustic mass that the acoustic channel represents. The invention further relates to a device with such a transducer.

REFERENCES:
patent: 3859477 (1975-01-01), Skvor
patent: 3978353 (1976-08-01), Kinoshita
patent: 4010334 (1977-03-01), Demeter
patent: 5132942 (1992-07-01), Cassone
patent: 5744700 (1998-04-01), Carme et al.
patent: 6038330 (2000-03-01), Meucci, Jr.
patent: 6263085 (2001-07-01), Weffer
patent: 6532292 (2003-03-01), Lygas
patent: 2003/0103637 (2003-06-01), Huang
patent: 2345850 (1975-03-01), None
patent: 518940 (2002-12-01), None
patent: WO 2004040941 (2004-05-01), None

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