EP1783715B1 - Emetteur d'alerte piézoélectrique - Google Patents

Emetteur d'alerte piézoélectrique 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
Authority
EP
European Patent Office
Prior art keywords
plate
alarm generator
piezoelectric
alarm
microphone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06121178A
Other languages
German (de)
English (en)
Other versions
EP1783715A2 (fr
EP1783715A3 (fr
Inventor
Michael Schlicker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Merten GmbH
Original Assignee
Merten GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Merten GmbH filed Critical Merten GmbH
Publication of EP1783715A2 publication Critical patent/EP1783715A2/fr
Publication of EP1783715A3 publication Critical patent/EP1783715A3/fr
Application granted granted Critical
Publication of EP1783715B1 publication Critical patent/EP1783715B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/10—Monitoring 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Alarm Systems (AREA)
  • Burglar Alarm Systems (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Electromechanical Clocks (AREA)
  • Fire Alarms (AREA)

Claims (5)

  1. Emetteur piézoélectrique d'alarme, en particulier pour un détecteur, présentant une plaque oscillante (35), une plaque piézoélectrique (37) fixée sur la plaque oscillante et une plaque d'électrode (38) divisée qui recouvre au moins une partie de la plaque piézoélectrique (37), l'application d'une tension alternative appropriée entre la plaque oscillante (35) et la plaque d'électrode (38) excitant des oscillations mécaniques,
    caractérisé en ce que
    une plaque (50) faisant partie d'un microphone, qui détecte les oscillations de la plaque oscillante (35) par l'intermédiaire des déformations de la plaque piézoélectrique (37) et qui délivre des signaux oscillants à un circuit de détection (20) qui détecte le fonctionnement de l'émetteur d'alarme (17) est de plus disposée sur le côté de la plaque d'électrode (38).
  2. Emetteur d'alarme selon la revendication 1, caractérisé en ce que la plaque de microphone (50) est intégrée totalement ou en partie dans la plaque d'électrode (38) en laissant un interstice (52).
  3. Emetteur d'alarme selon les revendications 1 ou 2, caractérisé en ce qu'il fait partie d'un détecteur de bruit (10) ou d'un autre système acoustique d'alarme dont le fonctionnement doit être vérifié régulièrement.
  4. Emetteur d'alarme selon l'une des revendications 1 à 3, caractérisé en ce que le circuit de détection (20) exécute un auto-test régulier, programmé temporellement ou aléatoire, et en affiche le résultat.
  5. Emetteur d'alarme selon l'une des revendications 1 à 4, caractérisé en ce que le circuit de détection (20) est un émetteur-récepteur relié par radio à un appareil externe d'interrogation (25).
EP06121178A 2005-10-13 2006-09-25 Emetteur d'alerte piézoélectrique Not-in-force EP1783715B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005049491A DE102005049491A1 (de) 2005-10-13 2005-10-13 Piezoelektrischer Alarmerzeuger

Publications (3)

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

Family

ID=37600817

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121178A Not-in-force EP1783715B1 (fr) 2005-10-13 2006-09-25 Emetteur d'alerte piézoélectrique

Country Status (4)

Country Link
EP (1) EP1783715B1 (fr)
AT (1) ATE449394T1 (fr)
DE (2) DE102005049491A1 (fr)
ES (1) ES2337077T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2073178B1 (fr) * 2007-12-21 2013-08-21 Atral-Secal GmbH Procédé de contrôle électrique de la capacité fonctionnelle d'un émetteur de signal piézoélectrique d'un avertisseur
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
EP1783715A2 (fr) 2007-05-09
ATE449394T1 (de) 2009-12-15
DE102005049491A1 (de) 2007-04-19
EP1783715A3 (fr) 2008-03-05
ES2337077T3 (es) 2010-04-20
DE502006005393D1 (de) 2009-12-31

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