Communications: electrical – Audible indication – Electronic
Reexamination Certificate
1999-10-13
2001-02-13
Trieu, Van T. (Department: 2736)
Communications: electrical
Audible indication
Electronic
C340S388100, C340S388300, C367S163000, C367S168000
Reexamination Certificate
active
06188313
ABSTRACT:
BACKGROUND OF INVENTION
The present invention relates to a device for generating very high sound pressure in air for example to prevent trespass, intrusion or unauthorized staying in an area indoors or outdoors so as to deliver a warning signal calling for attention as a siren.
There are several devices based on different techniques which however have disadvantages as,
areas with lower sound pressure
low sound pressure at frequencies important for public address
low efficiency
becomes very large and heavy when very powerful sound pressure is to be achieved
SUMMARY OF THE INVENTION
The object of the present invention is to provide a new device which to a large extent reduces the disadvantages above of already known devices and which also combine a very high sound pressure for a siren function at lower frequencies with a very high sound pressure for frequencies important for the public address function, and also very high sound pressure for even higher frequencies used for example to prevent intrusion or unauthorized staying.
This object is obtained by providing a device comprising at least an arrangement for generating sound while utilizing the flextensional technique, i.e., it has at least one surface element (
2
), the opposite ends (
4
,
5
) of which are arranged to be influenced to oscillate away from and towards each other and the surface element oscillating transversely and generating sound.
By using the flextensional technique in air and within totally new fields and adapting it in accordance with following disclosure can very high sound pressure be achieved within a broad frequency range with advantages as higher efficiency, lower weight, smaller size in comparison with earlier known techniques and devices for these applications.
REFERENCES:
patent: 4862429 (1989-08-01), Rolt
patent: 4901293 (1990-02-01), Kuhn
patent: 4932008 (1990-06-01), Rolt
patent: 4941202 (1990-07-01), Upton
patent: 5016228 (1991-05-01), Arnold et al.
patent: 5283835 (1994-02-01), Athanas
patent: 5291461 (1994-03-01), Boeglin et al.
patent: 5345428 (1994-09-01), Arnold et al.
patent: 5363346 (1994-11-01), Maltby
patent: 5537481 (1996-07-01), Voishvillo et al.
patent: 5959939 (1999-09-01), Tengham et al.
patent: 95/32601 (1995-11-01), None
patent: 96/27863 (1996-09-01), None
Åm System AB
Dilworth & Barrese LLP
Trieu Van T.
LandOfFree
Device for generating sound does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for generating sound, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for generating sound will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2571380