EP1197121B1 - Piezoelektrischer akustischer alarmgeber - Google Patents
Piezoelektrischer akustischer alarmgeber Download PDFInfo
- Publication number
- EP1197121B1 EP1197121B1 EP00960322A EP00960322A EP1197121B1 EP 1197121 B1 EP1197121 B1 EP 1197121B1 EP 00960322 A EP00960322 A EP 00960322A EP 00960322 A EP00960322 A EP 00960322A EP 1197121 B1 EP1197121 B1 EP 1197121B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- acoustic alarm
- piezoelectric
- piezoelectric acoustic
- square
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
Definitions
- the invention relates to a piezoelectric Acoustic alarm device that has a resonance hollow body certain resonance frequency and a coupled to it Piezo element includes that via voltage amplifier and a square wave generating oscillating means a direct current source is connected and goes from DE-A-342300 out.
- Such sound generator with which on the basis of in Inversion of the piezoelectric effect (Electrostriction) generated by electrical energy Vibrations of a piezoelectric crystal or similar substance with piezoelectric effects acoustic warning signal is generated are at Alarm systems known for a long time.
- When creating one electrical voltage to such a crystal changes this its shape to when removing the electrical Tension to return to its original form.
- the Applying a pulsating voltage causes a quick one Vibration of the crystal and consequently the emission of Sound waves.
- the invention is therefore based on the object to create piezoelectric audible alarm that with a small footprint and low power consumption provides a large volume of sound.
- the task is carried out according to the Features of claim 1 trained piezoelectric acoustic alarm device solved.
- the basic idea of the invention is that two in a single resonance hollow body Piezo elements are arranged opposite one another and so of a rectangular pulsating Device voltage are excited so that they differ from each other move away or towards each other or bend and thus swing in opposite directions.
- the opposite swing of the two piezo elements realized in such a way that one piezo element each between zero and a positive value pulsating square wave voltage and to the other Piezo element an inverse, each between zero and a rectangular voltage that changes with a negative value and both square wave voltages, starting from corresponding control signals of a microprocessor in order a pulse length are out of phase with each other.
- the first piezo element in the event of a voltage pulse bent in one direction while the second piezo element at its reverse voltage pulse in the subsequent de-energized phase of the first, now swinging back piezo element, in opposite Direction is bent.
- An embodiment of the invention is based on the attached drawing, in the only figure Resonance hollow body according to the invention on this attached piezo elements and a simplified Circuit arrangement shown for the invention out of phase and reverse voltage supply and Excitation of the piezo elements is reproduced, closer explained.
- the piezoelectric acoustic alarm device includes one Resonance hollow body 1, the natural frequency of which Frequency of the first and second connected to it Piezo elements 2a, 2b is matched. At two each other opposite side walls of the resonance hollow body 1 a piezo element 2a or 2b is attached in each case, that these or their vibration levels are exactly face.
- the formation of the piezo elements 2a and 2b, for example the arrangement of electrodes for Energy supply, or their attachment and storage on the Wall of the resonance hollow body 1 is in the drawing not shown.
- On the opposite faces of the resonance hollow body 1 are sound outlet openings 3 intended.
- piezo elements 2a, 2b vibrate, these are for supplying energy via one each first and a second power line 4a or 4b and first and second voltage amplifiers 5a and 5b and one common fuse 6 to a direct current source 7 connected.
- a direct current source 7 One also from the direct current source 7 powered microprocessor 8 is each over first and second control signal lines 9a and 9b with the relevant voltage amplifier 5a or 5b connected.
- a first rectangular pulse control signal V ca (5 V square-wave voltage) is sent via the first control line 9a to the first voltage amplifier 5a, and a second rectangular pulse signal V cb (180 °) out of phase with the first control signal V ca is sent via the second control line 9b. 5 V square wave voltage) to the second voltage amplifier 5b. While the control signal V cb is only amplified in the voltage amplifier 5b, a voltage inverter 5a is additionally assigned to the first voltage amplifier 5a.
- the first piezo element 2a is thus supplied with an amplified (negative) square-wave voltage V a which changes between zero and a negative value.
- the second piezo element 2b receives an amplified (positive) square-wave voltage pulsating between zero and a positive value, the voltage pulses of which are offset by one pulse width from those of the negative square-wave voltage V b .
- the piezo elements are caused to bend with each voltage pulse and to oscillate due to the successive voltage pulses.
- the first piezo element 2a Due to the oppositely directed square-wave voltages V a and V b and their phase shift, the first piezo element 2a is pressed inwards (dotted line) when the negative voltage pulse is applied to it, in order to swing back into the dot-dash position in the following zero volt phase. At this time, however, the second piezo element 2b is pressed outwards due to the positive voltage pulse into the dash-dotted position in order to swing back inward in the following zero-volt phase to the position shown in dotted lines, but in which the first piezo element 2a is pressed inwards again at the same time.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Burglar Alarm Systems (AREA)
- Fire-Detection Mechanisms (AREA)
- Electromechanical Clocks (AREA)
- Alarm Systems (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Description
- 1
- Resonanzhohlkörper
- 2a
- erstes Piezoelement
- 2b
- zweites Piezoelement
- 3
- Schallaustrittsöffnungen
- 4a
- erste Stromleitung
- 4b
- zweite Stromleitung
- 5a
- erster Spannungsverstärker
- 5a'
- Spannungsumkehrer
- 5b
- zweiter Spannungsverstärker
- 6
- Sicherung
- 7
- Gleichstromquelle (Batterie)
- 8
- Mikroprozessor
- 9a
- erste Steuersignalleitung
- 9b
- zweite Steuersignalleitung
- Vca
- erstes rechteckförmig pulsierendes Steuersignal (Rechteckspannung)
- Vcb
- zweites rechteckförmig pulsierendes Steuersignal (Rechteckspannung)
- Va
- verstärkte negative Rechteckspannung
- Vb
- verstärkte positive Rechteckspannung
Claims (5)
- Piezoelektrischer akustischer Alarmgeber mit benachbart angeordneten Piezoelementen (2a, 2b), die jeweils entgegengesetzt orientiert und phasenverschoben erregt sind, dadurch gekennzeichnet, daß zwei Piezoelemente (2a, 2b) unabhängig voneinander entgegengesetzt schwingend in einem Resonanzhohlkörper (1) an dessen gegenüberliegenden Seitenwänden angeordnet sind, wobei Mittel zur Erzeugung einer positiven und einer negativen Rechteckspannung und Mittel (8) zur Phasenverschiebung der beiden Rechteckspannungen um eine Impulsweite vorgesehen sind.
- Piezoelektischer akustischer Alarmgeber nach Anspruch 1, dadurch gekennzeichnet, daß die Piezoelemente (2a, 2b) über entsprechende Tragelemente an oder in den einander gegenüberliegenden Wänden des Resonanzhohlkörpers (1) zueinander deckungsgleich angebracht sind.
- Piezoelektischer akustischer Alarmgeber nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Resonanzhohlkörper (1) seitliche, schräg nach außen gerichtete Schallaustrittsöffnungen (3) aufweist.
- Piezoelektischer akustischer Alarmgeber nach einem der Ansprüche 1 bis 3, gekennzeichnet durch einen Mikroprozessor (8) zur Erzeugung von zwei zueinander phasenverschobenen Rechteckspannungen als Steuersignale (Vca, Vcb) jeweils für die einerseits mit dem betreffenden Piezoelement (2a, 2b) und andererseits mit der Gleichstromquelle (7) verbundenen Spannungsverstärker (5a, 5b).
- Piezoelektischer akustischer Alarmgeber nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß einem der Spannungsverstärker (5a oder 5b) ein Spannungsumkehrer (5a') zugeordnet ist.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19935768 | 1999-07-23 | ||
| DE19935768A DE19935768C2 (de) | 1999-07-23 | 1999-07-23 | Piezoelektrischer akustischer Alarmgeber |
| PCT/DE2000/002430 WO2001008448A2 (de) | 1999-07-23 | 2000-07-18 | Piezoelektrischer akustischer alarmgeber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1197121A2 EP1197121A2 (de) | 2002-04-17 |
| EP1197121B1 true EP1197121B1 (de) | 2003-09-03 |
Family
ID=7916560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00960322A Expired - Lifetime EP1197121B1 (de) | 1999-07-23 | 2000-07-18 | Piezoelektrischer akustischer alarmgeber |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6541894B1 (de) |
| EP (1) | EP1197121B1 (de) |
| AT (1) | ATE249133T1 (de) |
| AU (1) | AU762902B2 (de) |
| CA (1) | CA2380244C (de) |
| DE (2) | DE19935768C2 (de) |
| WO (1) | WO2001008448A2 (de) |
| ZA (1) | ZA200200491B (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011114471B4 (de) * | 2011-09-28 | 2013-05-08 | Eads Deutschland Gmbh | Membrananordnung zur Schallerzeugung |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2126436A (en) * | 1935-01-07 | 1938-08-09 | Brush Deveiepment Company | Acoustical apparatus |
| US2875355A (en) * | 1954-05-24 | 1959-02-24 | Gulton Ind Inc | Ultrasonic zone plate focusing transducer |
| US3872470A (en) * | 1973-04-18 | 1975-03-18 | Airco Inc | Audible signal generating apparatus having selectively controlled audible output |
| US4129799A (en) | 1975-12-24 | 1978-12-12 | Sri International | Phase reversal ultrasonic zone plate transducer |
| JPS5492307A (en) | 1977-12-29 | 1979-07-21 | Sony Corp | Driving circuit of electrostrictive converter |
| DE3146948A1 (de) | 1981-11-26 | 1983-06-01 | Siemens AG, 1000 Berlin und 8000 München | "elektromechanischer wandler" |
| FR2570916B1 (fr) | 1983-06-23 | 1988-04-15 | France Etat Armement | Procede et transducteur electro-acoustique pour emettre ou recevoir des ondes acoustiques dans plusieurs bandes passantes |
| JPS60134700A (ja) * | 1983-12-23 | 1985-07-17 | Nippon Denso Co Ltd | 発音装置 |
| US4700100A (en) * | 1986-09-02 | 1987-10-13 | Magnavox Government And Industrial Electronics Company | Flexural disk resonant cavity transducer |
| NL8602458A (nl) | 1986-09-29 | 1988-04-18 | Rheometron Ag | Ultrasone stromingsmeter. |
| JPH01115427A (ja) * | 1987-10-29 | 1989-05-08 | Nkk Corp | 湿式集塵装置のダストおよび洗滌水排出方法 |
| CA2020185A1 (en) | 1990-03-05 | 1991-09-06 | Gordon Walter Culp | Electrical drive for a segmented transducer |
| JPH0479779A (ja) * | 1990-07-18 | 1992-03-13 | Asmo Co Ltd | 超音波モータの駆動回路 |
| JP2737420B2 (ja) * | 1991-03-04 | 1998-04-08 | 日本電気株式会社 | 超音波モータの駆動方式 |
| US5258743A (en) * | 1991-07-29 | 1993-11-02 | Uniplex Corporation | Piezoelectric motion sensor |
| US5317305A (en) * | 1992-01-30 | 1994-05-31 | Campman James P | Personal alarm device with vibrating accelerometer motion detector and planar piezoelectric hi-level sound generator |
| US5842288A (en) * | 1996-12-10 | 1998-12-01 | U.S. Controls Corporation | Clothes dryer with chiming alarm |
| JP2002112564A (ja) * | 2000-09-29 | 2002-04-12 | Minolta Co Ltd | アクチュエータの駆動装置 |
-
1999
- 1999-07-23 DE DE19935768A patent/DE19935768C2/de not_active Expired - Fee Related
-
2000
- 2000-07-18 EP EP00960322A patent/EP1197121B1/de not_active Expired - Lifetime
- 2000-07-18 AU AU72681/00A patent/AU762902B2/en not_active Ceased
- 2000-07-18 DE DE50003563T patent/DE50003563D1/de not_active Expired - Fee Related
- 2000-07-18 US US10/031,734 patent/US6541894B1/en not_active Expired - Fee Related
- 2000-07-18 AT AT00960322T patent/ATE249133T1/de not_active IP Right Cessation
- 2000-07-18 CA CA002380244A patent/CA2380244C/en not_active Expired - Fee Related
- 2000-07-18 WO PCT/DE2000/002430 patent/WO2001008448A2/de not_active Ceased
-
2002
- 2002-01-21 ZA ZA200200491A patent/ZA200200491B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US6541894B1 (en) | 2003-04-01 |
| EP1197121A2 (de) | 2002-04-17 |
| CA2380244A1 (en) | 2001-02-01 |
| CA2380244C (en) | 2006-02-14 |
| ATE249133T1 (de) | 2003-09-15 |
| DE19935768A1 (de) | 2001-02-08 |
| DE19935768C2 (de) | 2003-10-09 |
| DE50003563D1 (de) | 2003-10-09 |
| ZA200200491B (en) | 2002-12-24 |
| AU762902B2 (en) | 2003-07-10 |
| WO2001008448A3 (de) | 2001-05-25 |
| WO2001008448A2 (de) | 2001-02-01 |
| AU7268100A (en) | 2001-02-13 |
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