EP1783715B1 - Piezoelectric alarm generator - Google Patents

Piezoelectric alarm generator Download PDF

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Publication number
EP1783715B1
EP1783715B1 EP06121178A EP06121178A EP1783715B1 EP 1783715 B1 EP1783715 B1 EP 1783715B1 EP 06121178 A EP06121178 A EP 06121178A EP 06121178 A EP06121178 A EP 06121178A EP 1783715 B1 EP1783715 B1 EP 1783715B1
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EP
European Patent Office
Prior art keywords
plate
alarm generator
piezoelectric
alarm
microphone
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EP06121178A
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German (de)
French (fr)
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EP1783715A2 (en
EP1783715A3 (en
Inventor
Michael Schlicker
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Merten GmbH
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Merten GmbH
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Publication of EP1783715A3 publication Critical patent/EP1783715A3/en
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    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02Monitoring continuously signalling or alarm systems
    • G08B29/10Monitoring of the annunciator circuits

Definitions

  • the invention relates to a piezoelectric alarm generator, in particular for a detector, with a vibrating plate, a piezoelectric plate which is mounted on the vibrating plate and an electrode plate covering the piezoelectric plate.
  • An alarm generator with a piezoelectric transducer is described in DE OS 27 02 381 ,
  • This alarm generator has a metallic vibrating plate, a piezoelectric plate and an electrode plate.
  • the piezoelectric plate carries, in addition to the electrode plate, another plate-shaped electrode, which may be referred to as a feedback electrode. This electrode is connected to the base of an electric oscillation generating transistor.
  • a piezoelectric alarm generator is further described in FIG DE 35 04 011 A1 , This document deals with contacting the vibrating electrodes of the alarm generator.
  • Alarm generators especially those contained in a detector, should undergo a periodic functional test to determine whether the alarm generator is functioning in the event of an alarm. This includes the presence of adequate electrical supply voltage as well as mechanical and electrical integrity testing.
  • the invention has for its object to provide an alarm generator, which is to test for functionality in a simple manner.
  • the alarm generator according to the present invention is defined by claim 1. It also has on the side of the electrode plate on a microphone plate which detects vibrations or deformations of the piezoelectric plate and provides vibration signals to a signaling circuit, which signals a functioning of the alarm generator.
  • a microphone is integrated in the piezoelectric alarm generator. It is therefore not necessary to let the alarm generator act on an external or separately installed microphone. Rather, the function of the alarm generator is recorded internally.
  • the alarm generator contains on the one hand a converter, which converts electrical vibrations into mechanical vibrations, and on the other hand, a further converter, which in turn produces electrical signals from the generated mechanical vibrations.
  • the evaluation of the electrical signals provides information about whether the alarm generator is functioning properly.
  • the evaluation of the vibration signals may include the mere presence of a vibration signal as well as information about the vibration frequency and the amplitude. In this way it can be ensured that the alarm signal is actually generated in the required form and strength.
  • the alarm-giving electrode plate and the microphone plate are formed of the same structured metal layer, resulting in a considerable amount of noise Reduction of manufacturing costs results because production technology no additional process steps arise. Also, an additional space required to accommodate a microphone for detecting the function of the alarm generator deleted.
  • the invention also makes it possible to apply a principle of an automatic self-test in which the alarm generator is checked for operability.
  • An automatic self-test can also make sense without radio transmission of the test result, for example if only an optical or acoustic indication of the functioning takes place or the functioning of the alarm generator is documented or registered.
  • the microphone plate is completely surrounded or delimited, leaving a gap, by the electrode plate of the alarm generator.
  • Such an alarm generator with feedback option is easy to produce and to save space. It can be realized in small format. Additional components are not required, so that no independent assembly of such components is necessary.
  • the invention is particularly - but not exclusively - for smoke detectors, and in particular for those detectors whose alarms must be checked regularly.
  • a safe interrogation and monitoring device of the smoke detector can be realized, with a deliberate, short release of the detector takes place and the acoustic message signal of the signal generator is electrically evaluated.
  • the signaling circuit is a transceiver, which communicates with an external interrogator. It is possible by the interrogator by radio to trigger an alarm and also by radio the function of Alarm generator in remote monitoring. In this way, numerous distributed detectors can be successively subjected to a functional test from a central office. Due to the rapid triggering, detection and evaluation, the test process can be carried out so quickly that persons present are not bothered.
  • a smoke detector 10 is shown, which can be mounted, for example, under the ceiling of a room.
  • the smoke detector 10 includes a substantially rotationally symmetrical housing 11 with a smoke-permeable insect screen 12, behind which there is a measuring chamber.
  • the measuring chamber contains a light source that emits a focused light beam. If smoke particles are contained in the measuring chamber, the light from the light source is scattered by the smoke particles. The scattered light is detected by a light receiver and converted into an electrical signal, this electrical signal is amplified and evaluated supplied to the acoustic alarm generator 13 by a microprocessor or a chip developed therefor.
  • the housing 11 of the smoke detector 10 has a conventional trigger button 14, which can be pressed to check in place the functionality of the alarm generator.
  • the smoke detector contains a light that flashes when triggered to make the smoke detector that has responded visually recognizable,
  • the smoke detector may include within the housing 11 a signaling circuit 20 in the form of a transceiver that can exchange radio signals with an interrogator 25.
  • the interrogator 25 is also a transceiver, so a radio that can both send and receive.
  • the interrogator 25 communicates with a computer 26 in which the query and its results are stored.
  • the computer 26 is u. a. provided with a screen 27.
  • the signaling circuit 20 contained in the housing 11 of the smoke detector communicates by radio bidirectionally with the interrogator 25, which is indicated by the double arrow 30.
  • the interrogator 25 sends an interrogation signal to the signaling circuit 20, This causes the triggering of the alarm case and generates an actuation signal for the acoustic alarm generator 13 and possibly an additional optical alarm generator or other alarm generator,
  • the alarm generator 13 is thereby set in operation, so that he Alarm sound generated, the alarm sound is recorded by a microphone 21 arranged on the alarm generator.
  • the microphone 21 provides to the signaling circuit 20 a signal indicating both the existence of the alarm sound and its amplitude.
  • the signaling circuit 20 sends by radio a corresponding confirmation signal containing this information to the interrogator 25th
  • the initiation of the polling can be done by the computer 26 or by the interrogator 25 either under manual control or automatically.
  • the interrogation signal which is sent from the interrogator 25 to the transceiver 20, preferably includes a unique identifier of the respective smoke detector 10. Each of the smoke detectors is assigned its own distinctive identifier.
  • the interrogator 25 can therefore selectively call one of numerous smoke detectors and check its functionality.
  • a log is created, which logs for each smoke detector, the identification and execution of the function query and the date and, if necessary, an identification of the operator concerned. In this way, numerous distributed smoke detectors 10 of a smoke detection system can be checked by a central interrogation device 25. The test can be performed automatically at regular intervals or under manual control.
  • the interrogator 25 is formed as a portable device that is brought into the vicinity of each individual smoke detector and communicates with the smoke detector via radio.
  • the interrogator 25 is then connected to the computer 26 either via a wireline or wirelessly.
  • the interrogator is positioned, for example, in front of an apartment door to communicate with the smoke detector installed inside the home. The smoke detectors of other apartments are then not reached by the interrogator. In this way, it is possible by an operator to check the smoke detectors in numerous apartments one after the other without entering the apartments.
  • the invention makes it possible to carry out an automatic self-test.
  • the controlling microprocessor can over a clock regularly as part of a self-test the alarm to check correct operation and display the error case by flashing an LED or otherwise or avoid radio by a central office.
  • FIGS. 2 and 3 show the structure of a conventional alarm generator, as in DE OS 27 02 381 is described.
  • a metallic oscillating plate 35 mounted on remote supports 36 is partially covered on its upper side with a bonded piezoelectric plate 37.
  • On the upper side of the plate 37 is an adhered electrode plate 38 made of metal.
  • a vibrator 39 is connected with one pole to the oscillating plate 35 and to the other pole of the electrode plate 38.
  • the electrical vibrations of the vibrator 39 generate pulsating movements of the piezoelectric plate 37, whereby the vibrating plate 35 is vibrated in the FIG. 3
  • the vibration plate 35 acts as a membrane for generating acoustic signals with the frequency of the vibration.
  • a first electrode 40 serves to connect the one pole of the oscillator 39 to the oscillating plate 35.
  • a second electrode 41 serves to connect the other pole of the oscillator 39 to the electrode plate 38.
  • a third electrode 42 is provided which is supported by a metal layer 43 The third electrode 42 forms a feedback electrode which is connected to the oscillator 39 and controls its oscillation by feedback.
  • the surface 43 is separated from the electrode plate by a gap 44.
  • FIG. 4 shows a first embodiment of the alarm generator with integrated microphone 21.
  • the electrode plate 38 leaves a surface area of the piezoelectric plate 37, which is covered with another microphone plate 50. This has an electrode 51 which is connected to the signaling circuit 20. Between the further microphone plate 50 and the electrode plate 38 is a narrow gap 52.
  • the microphone plate 50 is provided by the oscillating piezoelectric plate 37 disposed thereunder with an oscillating voltage potential, which is supplied as oscillation to the input of the signaling circuit 20. In this way, the seated on a portion of the piezoelectric plate 37 microphone plate 50 acts as a microphone for receiving the mechanical vibrations of the vibrating plate 35 and to implement these oscillations in electrical signals.
  • the microphone plate 50 While in the embodiment of FIG. 4 the microphone plate 50 is arranged on the edge of the electrode plate 38, it is in the embodiment of FIG. 5 completely surrounded by the electrode plate 38.
  • the microphone plate 50 effectively forms an island which is surrounded by an annular gap 52.
  • the microphone plate 50 formed with a (in FIG. 5 not shown) signaling circuit, a built-in alarm generator 13 microphone.

Abstract

The piezoelectric alarm generator (17) has a vibrating plate (35), a piezoelectric plate (37) attached to the vibrating plate and a divided electrode plate (38) partly covering the piezoelectric plate, whereby mechanical vibrations can be stimulated by applying a suitable alternating voltage between the plates. A microphone sub-panel (50) arranged the side of the electrode plate detects oscillations of the vibrating plate from deformations of the piezoelectric plate and feeds oscillation signals to a reporting circuit (20), which signals operation of the alarm generator.

Description

Die Erfindung betrifft einen piezoelektrischen Alarmerzeuger, insbesondere für einen Melder, mit einer Schwingplatte, einer piezoelektrischen Platte, die auf der Schwingplatte befestigt ist und einer die piezoelektrische Platte bedeckenden Elektrodenplatte.The invention relates to a piezoelectric alarm generator, in particular for a detector, with a vibrating plate, a piezoelectric plate which is mounted on the vibrating plate and an electrode plate covering the piezoelectric plate.

Ein Alarmerzeuger mit einem piezoelektrischen Wandler ist beschrieben in DE OS 27 02 381 . Dieser Alarmerzeuger weist eine metallische Schwingplatte, eine piezoelektrische Platte und eine Elektrodenplatte auf. Die piezoelektrische Platte trägt außer der Elektrodenplatte eine weitere plattenförmige Elektrode, welche als Rückkopplungselektrode bezeichnet werden kann. Diese Elektrode ist mit der Basis eines eine elektrische Schwingung erzeugenden Transistors verbunden.An alarm generator with a piezoelectric transducer is described in DE OS 27 02 381 , This alarm generator has a metallic vibrating plate, a piezoelectric plate and an electrode plate. The piezoelectric plate carries, in addition to the electrode plate, another plate-shaped electrode, which may be referred to as a feedback electrode. This electrode is connected to the base of an electric oscillation generating transistor.

Ein piezoelektrischer Alarmerzeuger ist ferner beschrieben in DE 35 04 011 A1 . Diese Schrift befasst sich mit der Kontaktierung der schwingenden Elektroden des Alarmerzeugers.A piezoelectric alarm generator is further described in FIG DE 35 04 011 A1 , This document deals with contacting the vibrating electrodes of the alarm generator.

Alarmerzeuger, insbesondere wenn sie in einem Melder enthalten sind, sollten regelmäßig einer Funktionsprüfung unterzogen werden, um zu ermitteln, ob der Alarmerzeuger im Alarmfall auch funktioniert, Dies schließt das Vorhandensein einer ausreichenden elektrischen Versorgungsspannung ebenso ein wie die Prüfung auf mechanische und elektrische Unversehrtheit.Alarm generators, especially those contained in a detector, should undergo a periodic functional test to determine whether the alarm generator is functioning in the event of an alarm. This includes the presence of adequate electrical supply voltage as well as mechanical and electrical integrity testing.

Der Erfindung liegt die Aufgabe zugrunde, einen Alarmerzeuger zu schaffen, der auf einfache Weise auf Funktionsfähigkeit zu prüfen ist.The invention has for its object to provide an alarm generator, which is to test for functionality in a simple manner.

Der Alarmerzeuger nach der vorliegenden Erfindung ist durch den Patentanspruch 1, definiert. Er weist auf der Seite der Elektrodenplatte außerdem eine Mikrofonplatte auf, die Schwingungen bzw. Deformationen der piezoelektrischen Platte detektiert und Schwingungssignale an eine Meldeschaltung liefert, welche ein Funktionieren des Alarmerzeugers meldet.The alarm generator according to the present invention is defined by claim 1. It also has on the side of the electrode plate on a microphone plate which detects vibrations or deformations of the piezoelectric plate and provides vibration signals to a signaling circuit, which signals a functioning of the alarm generator.

Erfindungsgemäß ist in den piezoelektrischen Alarmerzeuger ein Mikrofon integriert. Es ist daher nicht erforderlich, den Alarmerzeuger auf ein externes oder separat eingebautes Mikrofon wirken zu lassen. Vielmehr wird die Funktion des Alarmerzeugers intern aufgenommen. Der Alarmerzeuger enthält einerseits einen Umsetzer, der elektrische Schwingungen in mechanische Schwingungen umsetzt, und andererseits einen weiteren Umsetzer, der wiederum elektrische Signale aus den erzeugten mechanischen Schwingungen herstellt. Die Auswertung der elektrischen Signale ergibt eine Information darüber, ob der Alarmerzeuger ordnungsgemäß funktioniert. Die Auswertung der Schwingsignale kann das bloße Vorhandensein eines Schwingsignals einschließen sowie auch Angaben über die Schwingfrequenz und die Amplitude. Auf diese Weise kann sichergestellt werden, dass das Alarmsignal in der benötigten Form und Stärke tatsächlich erzeugt wird.According to the invention, a microphone is integrated in the piezoelectric alarm generator. It is therefore not necessary to let the alarm generator act on an external or separately installed microphone. Rather, the function of the alarm generator is recorded internally. The alarm generator contains on the one hand a converter, which converts electrical vibrations into mechanical vibrations, and on the other hand, a further converter, which in turn produces electrical signals from the generated mechanical vibrations. The evaluation of the electrical signals provides information about whether the alarm generator is functioning properly. The evaluation of the vibration signals may include the mere presence of a vibration signal as well as information about the vibration frequency and the amplitude. In this way it can be ensured that the alarm signal is actually generated in the required form and strength.

Die Elektrodenplatte für das Alarmgeben und die Mikrofonplatte werden aus demselben strukturierten Metalllayer gebildet, wodurch sich eine beträchtliche Verringerung der Herstellkosten ergibt, da fertigungstechnisch keine zusätzlichen Prozessschritte entstehen. Auch ein zusätzlicher Platzaufwand zur Unterbringung eines Mikrofons zur Detektion der Funktion des Alarmerzeugers entfällt.The alarm-giving electrode plate and the microphone plate are formed of the same structured metal layer, resulting in a considerable amount of noise Reduction of manufacturing costs results because production technology no additional process steps arise. Also, an additional space required to accommodate a microphone for detecting the function of the alarm generator deleted.

Die Erfindung ermöglicht auch die Anwendung eines Prinzips eines automatischen Selbsttests, bei dem der Alarmerzeuger auf Funktionsfähigkeit überprüft wird. Ein automatischer Selbsttest kann auch ohne eine Funkübertragung des Testresultats sinnvoll sein, beispielsweise wenn lediglich eine optische oder akustische Anzeige des Funktionierens erfolgt oder das Funktionieren des Alarmerzeugers dokumentiert bzw. registriert wird.The invention also makes it possible to apply a principle of an automatic self-test in which the alarm generator is checked for operability. An automatic self-test can also make sense without radio transmission of the test result, for example if only an optical or acoustic indication of the functioning takes place or the functioning of the alarm generator is documented or registered.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist die Mikrofonplatte unter Belassung eines Spaltes ganz oder teilweise von der Elektrodenplatte des Alarmerzeugers umgeben oder begrenzt. Ein solcher Alarmerzeuger mit Rückmeldungsmöglichkeit ist einfach herstellbar und platzsparend unterzubringen. Er kann kleinformatig realisiert werden. Zusätzliche Bauteile sind nicht erforderlich, so dass auch keine selbstständige Montage solcher Bauteile nötig ist.According to a preferred embodiment of the invention, the microphone plate is completely surrounded or delimited, leaving a gap, by the electrode plate of the alarm generator. Such an alarm generator with feedback option is easy to produce and to save space. It can be realized in small format. Additional components are not required, so that no independent assembly of such components is necessary.

Die Erfindung eignet sich insbesondere - jedoch nicht ausschließlich - für Rauchmelder, und insbesondere für solche Melder, deren Alarmgeber regelmäßig überprüft werden müssen. Mit diesem kombinierten Alarmerzeuger mit mechanisch, zwangsgeführter Rückkoppelung, kann eine sichere Abfrage- und Überwachungseinrichtung des Rauchmelders realisiert werden, wobei eine gewollte, kurze Auslösung des Melders erfolgt und das akustische Meldesignal des Signalgebers elektrisch ausgewertet wird.The invention is particularly - but not exclusively - for smoke detectors, and in particular for those detectors whose alarms must be checked regularly. With this combined alarm generator with mechanical, positively driven feedback, a safe interrogation and monitoring device of the smoke detector can be realized, with a deliberate, short release of the detector takes place and the acoustic message signal of the signal generator is electrically evaluated.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist die Meldeschaltung ein Sende-Empfänger, der mit einem externen Abfragegerät in Verbindung steht. Hierbei besteht die Möglichkeit durch das Abfragegerät per Funk eine Alarmauslösung zu bewirken und ebenfalls per Funk die Funktion des Alarmerzeugers in Fernüberwachung zu prüfen. Auf diese Weise können zahlreiche verteilt angeordnete Melder von einer Zentrale aus nacheinander einer Funktionsprüfung unterzogen werden, Aufgrund der schnellen Auslösung, Erkennung und Auswertung kann der Prüfprozess so schnell erfolgen, dass anwesende Personen nicht belästigt werden.According to a preferred embodiment of the invention, the signaling circuit is a transceiver, which communicates with an external interrogator. It is possible by the interrogator by radio to trigger an alarm and also by radio the function of Alarm generator in remote monitoring. In this way, numerous distributed detectors can be successively subjected to a functional test from a central office. Due to the rapid triggering, detection and evaluation, the test process can be carried out so quickly that persons present are not bothered.

Im Folgenden werden unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert.In the following, embodiments of the invention will be explained in more detail with reference to the drawings.

Es zeigen:

Fig. 1
eine schematische Darstellung eines Rauchmelders in Seitenansicht,
Fig. 2
eine Draufsicht eines konventionellen Alarmerzeugers,
Fig. 3
einen Längsschnitt durch den Alarmerzeuger nach Fig. 2,
Fig.4
eine Draufsicht einer ersten Ausführungsform des erfindungsgemäßen Alarmerzeugers und
Fig. 5
eine Draufsicht auf eine zweite Ausführungsform der Erfindung.
Show it:
Fig. 1
a schematic representation of a smoke detector in side view,
Fig. 2
a top view of a conventional alarm generator,
Fig. 3
a longitudinal section through the alarm generator after Fig. 2 .
Figure 4
a plan view of a first embodiment of the invention Alarmerzeugers and
Fig. 5
a plan view of a second embodiment of the invention.

In der Zeichnung ist ein Rauchmelder 10 dargestellt, der beispielsweise unter der Decke eines Raumes montiert werden kann. Der Rauchmelder 10 enthält ein im Wesentlichen rotationssymmetrisches Gehäuse 11 mit einem für Rauch durchlässigen Insektenschutzgitter 12, hinter dem sich eine Messkammer befindet. Die Messkammer enthält eine Lichtquelle, die einen gebündelten Lichtstrahl aussendet. Wenn Rauchpartikel in der Messkammer enthalten sind, wird das Licht der Lichtquelle von den Rauchpartikeln gestreut. Das Streulicht wird von einem Lichtempfänger detektiert und in ein elektrisches Signal umgewandelt, Dieses elektrische Signal wird nach Verstärkung und Auswertung durch einen Mikroprozessor oder einen hierfür entwickelten Chip dem akustischen Alarmerzeuger 13 zugeführt.In the drawing, a smoke detector 10 is shown, which can be mounted, for example, under the ceiling of a room. The smoke detector 10 includes a substantially rotationally symmetrical housing 11 with a smoke-permeable insect screen 12, behind which there is a measuring chamber. The measuring chamber contains a light source that emits a focused light beam. If smoke particles are contained in the measuring chamber, the light from the light source is scattered by the smoke particles. The scattered light is detected by a light receiver and converted into an electrical signal, this electrical signal is amplified and evaluated supplied to the acoustic alarm generator 13 by a microprocessor or a chip developed therefor.

Das Gehäuse 11 des Rauchmelders 10 weist einen üblichen Auslöseknopf 14 auf, der gedrückt werden kann, um am Ort die Funktionsfähigkeit des Alarmerzeugers zu prüfen. Außerdem enthält der Rauchmelder eine Leuchte, die im Auslösefall blinkt, um den Rauchmelder, der angesprochen hat, auch optisch erkennbar zu machen,The housing 11 of the smoke detector 10 has a conventional trigger button 14, which can be pressed to check in place the functionality of the alarm generator. In addition, the smoke detector contains a light that flashes when triggered to make the smoke detector that has responded visually recognizable,

Der Rauchmelder kann innerhalb des Gehäuses 11 eine Meldeschaltung 20 in Form eines Sende-Empfängers enthalten, der Funksignale mit einem Abfragegerät 25 austauschen kann. Das Abfragegerät 25 ist ebenfalls ein Sende-Empfänger, also ein Funkgerät, das sowohl senden als auch empfangen kann. Das Abfragegerät 25 kommuniziert mit einem Computer 26, in dem die Abfrage und ihre Ergebnisse gespeichert werden. Der Computer 26 ist u. a. mit einem Bildschirm 27 versehen.The smoke detector may include within the housing 11 a signaling circuit 20 in the form of a transceiver that can exchange radio signals with an interrogator 25. The interrogator 25 is also a transceiver, so a radio that can both send and receive. The interrogator 25 communicates with a computer 26 in which the query and its results are stored. The computer 26 is u. a. provided with a screen 27.

Die im Gehäuse 11 des Rauchmelders enthaltene Meldeschaltung 20 kommuniziert per Funk bidirektional mit dem Abfragegerät 25, was durch den Doppelpfeil 30 angedeutet ist. Das Abfragegerät 25 sendet ein Abfragesignal an die Meldeschaltung 20, Diese bewirkt das Auslösen des Alarmfalls und erzeugt ein Betätigungssignal für den akustischen Alarmerzeuger 13 und ggf. einen zusätzlichen optischen Alarmerzeuger oder weitere Alarmerzeuger, Der Alarmerzeuger 13 wird dadurch in Funktion gesetzt, so dass er das Alarmgeräusch erzeugt, Das Alarmgeräusch wird von einem an dem Alarmerzeuger angeordneten Mikrofon 21 aufgenommen. Das Mikrofon 21 liefert an die Meldeschaltung 20 ein Signal, das sowohl die Existenz des Alarmgeräusches als auch dessen Amplitude angibt. Die Meldeschaltung 20 sendet per Funk ein entsprechendes Bestätigungssignal, das diese Informationen enthält, an das Abfragegerät 25.The signaling circuit 20 contained in the housing 11 of the smoke detector communicates by radio bidirectionally with the interrogator 25, which is indicated by the double arrow 30. The interrogator 25 sends an interrogation signal to the signaling circuit 20, This causes the triggering of the alarm case and generates an actuation signal for the acoustic alarm generator 13 and possibly an additional optical alarm generator or other alarm generator, The alarm generator 13 is thereby set in operation, so that he Alarm sound generated, the alarm sound is recorded by a microphone 21 arranged on the alarm generator. The microphone 21 provides to the signaling circuit 20 a signal indicating both the existence of the alarm sound and its amplitude. The signaling circuit 20 sends by radio a corresponding confirmation signal containing this information to the interrogator 25th

Die Initiierung der Abfrage kann durch den Computer 26 oder durch das Abfragegerät 25 entweder unter manueller Steuerung oder automatisch erfolgen.The initiation of the polling can be done by the computer 26 or by the interrogator 25 either under manual control or automatically.

Das Abfragesignal, das von dem Abfragegerät 25 an den Sende-Empfänger 20 geschickt wird, enthält vorzugsweise eine unverwechselbare Kennung des betreffenden Rauchmelders 10. Jedem der Rauchmelder ist eine eigene unverwechselbare Kennung zugeteilt. Das Abfragegerät 25 kann also einen von zahlreichen Rauchmeldern selektiv aufrufen und auf seine Funktionsfähigkeit hin überprüfen. In dem Computer 26 wird ein Protokoll erstellt, das für jeden Rauchmelder die Kennung und die Durchführung der Funktionsabfrage sowie das Datum und ggf. eine Identifizierung der betreffenden Bedienungsperson protokolliert. Auf diese Weise können von einem zentralen Abfragegerät 25 zahlreiche verteilt angeordnete Rauchmelder 10 einer Rauchmeldeanlage geprüft werden. Die Prüfung kann in regelmäßigen Abständen automatisch durchgeführt werden oder unter manueller Steuerung.The interrogation signal, which is sent from the interrogator 25 to the transceiver 20, preferably includes a unique identifier of the respective smoke detector 10. Each of the smoke detectors is assigned its own distinctive identifier. The interrogator 25 can therefore selectively call one of numerous smoke detectors and check its functionality. In the computer 26, a log is created, which logs for each smoke detector, the identification and execution of the function query and the date and, if necessary, an identification of the operator concerned. In this way, numerous distributed smoke detectors 10 of a smoke detection system can be checked by a central interrogation device 25. The test can be performed automatically at regular intervals or under manual control.

Abweichend hiervon besteht die Möglichkeit, das Abfragegerät 25 als tragbares Gerät auszubilden, das in die Nähe jedes einzelnen Rauchmelders gebracht wird und über Funk mit dem Rauchmelder kommuniziert, Das Abfragegerät 25 ist dann mit dem Computer 26 entweder über eine Drahtleitung oder drahtlos verbunden.Notwithstanding this, it is possible to form the interrogator 25 as a portable device that is brought into the vicinity of each individual smoke detector and communicates with the smoke detector via radio. The interrogator 25 is then connected to the computer 26 either via a wireline or wirelessly.

Gemäß der zweiten Variante kann anstelle einer individuellen Kennung der einzelnen Rauchmelder vorgesehen sein, dass die Funkverbindung zwischen dem Abfragegerät 25 und den einzelnen Rauchmeldern eine begrenzte definierte Reichweite hat. In diesem Fall wird das Abfragegerät beispielsweise vor einer Wohnungstür positioniert, um mit dem im Innern der Wohnung installierten Rauchmelder zu kommunizieren. Die Rauchmelder anderer Wohnungen werden dann von dem Abfragegerät nicht erreicht. Auf diese Weise ist es möglich, durch eine Bedienungsperson die Rauchmelder in zahlreichen Wohnungen nacheinander zu überprüfen, ohne die Wohnungen zu betreten.According to the second variant may be provided instead of an individual identifier of each smoke detector that the radio link between the interrogator 25 and the individual smoke detectors has a limited defined range. In this case, the interrogator is positioned, for example, in front of an apartment door to communicate with the smoke detector installed inside the home. The smoke detectors of other apartments are then not reached by the interrogator. In this way, it is possible by an operator to check the smoke detectors in numerous apartments one after the other without entering the apartments.

Die Erfindung ermöglicht die Durchführung eines automatischen Selbsttests. Der steuernde Mikroprozessor kann über eine Uhr regelmäßig im Rahmen eines Selbsttests den Alarmgeber auf korrekte Funktion überprüfen und den Fehlerfall durch Blinken einer LED oder auf andere Weise anzeigen oder per Funk an eine Zentrale meiden.The invention makes it possible to carry out an automatic self-test. The controlling microprocessor can over a clock regularly as part of a self-test the alarm to check correct operation and display the error case by flashing an LED or otherwise or avoid radio by a central office.

Die Figuren 2 und 3 zeigen den Aufbau eines herkömmlichen Alarmerzeugers, wie er in DE OS 27 02 381 beschrieben ist. Eine metallische Schwingplatte 35, die auf entfernt angeordneten Auflagern 36 gelagert ist, ist auf ihrer Oberseite mit einer aufgeklebten piezoelektrischen Platte 37 teilweise bedeckt. Auf der Oberseite der Platte 37 befindet sich eine aufgeklebte Elektrodenplatte 38, aus Metall, Ein Schwingungserzeuger 39 ist mit einem Pol mit der Schwingplatte 35 und mit dem anderen Pol der Elektrodenplatte 38 verbunden. Die elektrischen Schwingungen des Schwingungserzeugers 39 erzeugen pulsierende Bewegungen der piezoelektrischen Platte 37, wodurch die Schwingplatte 35 in Schwingungen versetzt wird, die in Figur 3 gestrichelt dargestellt sind, Die Schwingplatte 35 wirkt als Membran zur Erzeugung akustischer Signale mit der Frequenz der Schwingung.The FIGS. 2 and 3 show the structure of a conventional alarm generator, as in DE OS 27 02 381 is described. A metallic oscillating plate 35 mounted on remote supports 36 is partially covered on its upper side with a bonded piezoelectric plate 37. On the upper side of the plate 37 is an adhered electrode plate 38 made of metal. A vibrator 39 is connected with one pole to the oscillating plate 35 and to the other pole of the electrode plate 38. The electrical vibrations of the vibrator 39 generate pulsating movements of the piezoelectric plate 37, whereby the vibrating plate 35 is vibrated in the FIG. 3 The vibration plate 35 acts as a membrane for generating acoustic signals with the frequency of the vibration.

Eine erste Elektrode 40, dient dem Anschluss des einen Pols des Schwingungserzeuger 39 an die Schwingplatte 35. Eine zweite Elektrode 41 dient dem Anschluss des anderen Poles des Schwingungserzeugers 39 an die Elektrodenplatte 38. Ferner ist eine dritte Elektrode 42 vorgesehen, die von einer Metallschicht 43 umgeben ist, welche einen Teil der Oberfläche der piezoelektrischen Platte 37 bedeckt, Die dritte Elektrode 42 bildet eine Rückkopplungselektrode, die mit dem Schwingungserzeuger 39 verbunden ist und dessen Schwingung durch Rückkopplung steuert. Die Fläche 43 ist von der Elektrodenplatte durch einen Spalt 44 getrennt.A first electrode 40 serves to connect the one pole of the oscillator 39 to the oscillating plate 35. A second electrode 41 serves to connect the other pole of the oscillator 39 to the electrode plate 38. Furthermore, a third electrode 42 is provided which is supported by a metal layer 43 The third electrode 42 forms a feedback electrode which is connected to the oscillator 39 and controls its oscillation by feedback. The surface 43 is separated from the electrode plate by a gap 44.

Figur 4 zeigt ein erstes Ausführungsbeispiel des Alarmerzeugers mit integriertem Mikrofon 21. Die Elektrodenplatte 38 lässt einen Oberflächenbereich der piezoelektrischen Platte 37 frei, der mit einer weiteren Mikrofonplatte 50 bedeckt ist. Diese weist eine Elektrode 51 auf, welche mit der Meldeschaltung 20 verbunden ist. Zwischen der weiteren Mikrofonplatte 50 und der Elektrodenplatte 38 befindet sich ein schmaler Spalt 52. FIG. 4 shows a first embodiment of the alarm generator with integrated microphone 21. The electrode plate 38 leaves a surface area of the piezoelectric plate 37, which is covered with another microphone plate 50. This has an electrode 51 which is connected to the signaling circuit 20. Between the further microphone plate 50 and the electrode plate 38 is a narrow gap 52.

Die Mikrofonplatte 50 wird durch die darunter angeordnete schwingende piezoelektrische Platte 37 mit einem oszillierenden Spannungspotential versehen, das als Schwingung dem Eingang der Meldeschaltung 20 zugeführt wird. Auf diese Weise wirkt die auf einem Teil der piezoelektrischen Platte 37 sitzende Mikrofonplatte 50 als Mikrofon zur Aufnahme der mechanische Schwingungen der Schwingplatte 35 und zur Umsetzung dieser Schwingungen in elektrische Signale.The microphone plate 50 is provided by the oscillating piezoelectric plate 37 disposed thereunder with an oscillating voltage potential, which is supplied as oscillation to the input of the signaling circuit 20. In this way, the seated on a portion of the piezoelectric plate 37 microphone plate 50 acts as a microphone for receiving the mechanical vibrations of the vibrating plate 35 and to implement these oscillations in electrical signals.

Während bei dem Ausführungsbeispiel von Figur 4 die Mikrofonplatte 50 am Rande der Elektrodenplatte 38 angeordnet ist, ist sie bei dem Ausführungsbeispiel von Figur 5 von der Elektrodenplatte 38 vollständig umgeben. Die Mikrofonplatte 50 bildet gewissermaßen eine Insel, die von einem ringförmigen Spalt 52 umgeben ist. Auch hier bildet die Mikrofonplatte 50, die mit einer (in Figur 5 nicht dargestellten) Meldeschaltung verbunden ist, ein in den Alarmerzeuger 13 integriertes Mikrofon.While in the embodiment of FIG. 4 the microphone plate 50 is arranged on the edge of the electrode plate 38, it is in the embodiment of FIG. 5 completely surrounded by the electrode plate 38. The microphone plate 50 effectively forms an island which is surrounded by an annular gap 52. Again, the microphone plate 50 formed with a (in FIG. 5 not shown) signaling circuit, a built-in alarm generator 13 microphone.

Claims (5)

  1. Piezoelectric alarm generator, in particular for a detector, having an oscillating plate (35), a piezoelectric plate (37) which is fastened to the oscillating plate, and a divided electrode plate (38) which partially covers the piezoelectric plate (37), mechanical oscillations being excited by applying a suitable AC voltage between the oscillating plate (30) and the electrode plate (38),
    characterized in that
    a microphone part plate (50) is also arranged on the side of the electrode plate (38), said microphone part plate detecting oscillations of the oscillating plate (35) by virtue of deformation of the piezoelectric plate (37) and supplying oscillation signals to a reporting circuit (20) which reports functioning of the alarm generator (17).
  2. Alarm generator according to Claim 1,
    characterized in that the microphone plate (50) is completely or partially integrated in the electrode plate (38) so as to leave a gap (52).
  3. Alarm generator according to Claim 1 or 2,
    characterized in that it is part of a smoke detector (10) or another acoustic alarm system whose function needs to be checked regularly.
  4. Alarm generator according to one of Claims 1-3, characterized in that the reporting circuit (20) carries out a regular, time-controlled or random-controlled self-test and indicates the result.
  5. Alarm generator according to one of Claims 1-4, characterized in that the reporting circuit (20) is a transceiver which has a radio link to an external interrogator (25).
EP06121178A 2005-10-13 2006-09-25 Piezoelectric alarm generator Not-in-force EP1783715B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005049491A DE102005049491A1 (en) 2005-10-13 2005-10-13 Piezoelectric alarm generator has microphone sub-panel that detects oscillations of vibrating plate from deformations of piezoelectric plate and feeds oscillation signals to reporting circuit that signals operation of alarm generator

Publications (3)

Publication Number Publication Date
EP1783715A2 EP1783715A2 (en) 2007-05-09
EP1783715A3 EP1783715A3 (en) 2008-03-05
EP1783715B1 true EP1783715B1 (en) 2009-11-18

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ID=37600817

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Application Number Title Priority Date Filing Date
EP06121178A Not-in-force EP1783715B1 (en) 2005-10-13 2006-09-25 Piezoelectric alarm generator

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EP (1) EP1783715B1 (en)
AT (1) ATE449394T1 (en)
DE (2) DE102005049491A1 (en)
ES (1) ES2337077T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2073178B1 (en) * 2007-12-21 2013-08-21 Atral-Secal GmbH Method for electronically checking the functionality of a piezo-electric signal generator of a warning system
US20130147620A1 (en) * 2011-12-12 2013-06-13 Utc Fire & Security Americas Corporation, Inc. Remote monitoring of an emergency system during test of emergency notification devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037222A (en) * 1975-10-02 1977-07-19 Gulf & Western Manufacturing Company (Systems) Supervision of transducers
US4122365A (en) * 1976-01-26 1978-10-24 Projects Unlimited, Inc. Piezoelectric buzzer device

Also Published As

Publication number Publication date
ES2337077T3 (en) 2010-04-20
DE502006005393D1 (en) 2009-12-31
EP1783715A2 (en) 2007-05-09
DE102005049491A1 (en) 2007-04-19
ATE449394T1 (en) 2009-12-15
EP1783715A3 (en) 2008-03-05

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