EP0266485A2 - Trompe électromagnétique avec excitation d'un diaphragme acoustique commandé électroniquement au moyen de capteurs mesurant sa fréquence de résonance - Google Patents
Trompe électromagnétique avec excitation d'un diaphragme acoustique commandé électroniquement au moyen de capteurs mesurant sa fréquence de résonance Download PDFInfo
- Publication number
- EP0266485A2 EP0266485A2 EP87107567A EP87107567A EP0266485A2 EP 0266485 A2 EP0266485 A2 EP 0266485A2 EP 87107567 A EP87107567 A EP 87107567A EP 87107567 A EP87107567 A EP 87107567A EP 0266485 A2 EP0266485 A2 EP 0266485A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- diaphragm
- electromagnet
- horn
- resonance frequency
- sensor
- 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.)
- Withdrawn
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0223—Driving circuits for generating signals continuous in time
- B06B1/0269—Driving circuits for generating signals continuous in time for generating multiple frequencies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
- B06B2201/50—Application to a particular transducer type
- B06B2201/52—Electrodynamic transducer
- B06B2201/53—Electrodynamic transducer with vibrating magnet or coil
Definitions
- This invention relates to the field of electromechanical resonance devices for sound generation, and particularly to high-sounding horns for vehicles, trains and boats.
- Sound generating devices of the electromechanical excitation type currently consist of: - a resilient steel diaphragm carrying in its centre the mobile part of an electromagnet; - an electric switch with a normally closed contact connected in series with the power feed to the electromagnet; - an adjustment screw which determines the switch contact opening point; - a diffuser which resonates at the same frequency as the metal diaphragm.
- the electromagnet When the electromagnet is electrically fed, it attracts the mobile part rigid with the resilient diaphragm. When the diaphragm has nearly attained its maximum travel, the switch connected in series with the electromagnet coil is opened by a push rod operated by the mobile part of the electromagnet.
- the mobile part of the electromagnet and the diaphragm on which it is fixed continue their travel by inertia until their kinetic energy has been completely absorbed elastically; beyond this point, the elastic energy accumulated by the diaphragm is restituted by reaction with the fixed structure to which it is connected, so that the diaphragm reverses its direction of movement. In this manner it again closes the switch which, again exciting the electromagnet, causes the diaphragm to commence a new oscillation cycle at a frequency equal to the resonance frequency of the electromechanical system.
- the magnetic vibration is obtained by electronic oscillators operating at a vibration frequency approximately equal to the resonance frequency of the electromagnetic system; with this method the oscillator output controls an electronic switch connected in series with the electromagnet coil, thus replacing the mechanically operated switch.
- this method has drawbacks which can be summarized as follows. Firstly, the generated frequency must be stabilised to make it independent of voltage variations; the generated frequency must also be acceptable to the variation in the diaphragm resonance frequency caused by variations in its temperature.
- a further serious drawback of this method is the cost involved in limiting the diaphragm production tolerances so that the resonance frequency of the diaphragms produced does not fall outside the limited tolerance range compatible with the constant frequency emitted by the electronic generator.
- This drawback is eloquently displayed by the reduction in sound output consequent on the variation in the mechanical vibration characteristics of the system, deriving from lengthy operation.
- the mechanical parts of the system have the same resonance frequency as the electronic oscillator, as they age they acquire a different frequency because of the fall-off in mechanical strength, the slack which occurs in the connections, the occurrence of wear and other reasons.
- An object of the present invention is to provide a horn which dispenses with the mechanical switch, so obviating all the aforesaid drawbacks caused by it.
- a further object is to provide a horn the sound of which deives from the generation of a diaphragm vibration induction frequency which is always the frequency creating maximum diaphragm resonance, independently of the variations in this latter deriving from any variation in the diaphragm dimensions, structure or fixing.
- An electromechanical horn provided with an acoustic diaphragm able to undergo movements induced in it by variable magnetic fields generated by an electromagnet, characterised in that the electromagnet which operates the diaphragm is excited by frequencies generated by an electronic oscillator which are based on the value of the maximum diaphragm resonance frequency measured by a specific sensor.
- the metal container 1 forms the fixed part of the electromagnet, and carries fixed to the centre of its closed base 2 a ferromagnetic core 3 with the relative coil 4.
- this container is closed by a diaphragm 5 fixed in a particularly rigid manner about its entire edge, which is usually circular.
- the diaphragm 5 is usually of steel and has fixed to its central region a ferromagnetic core 6 forming the mobile part of the electromagnet.
- the reference numeral 7 indicates a sensor for sensing the pressure variations induced in the air by the vibration of the overlying diaphragm 5.
- This sensor which in a certain sense could be called a "microphone" can obviously be of various types, as can normal microphones. It can thus, with suitable circuit modifications, be in the form of various types of electrical pressure transducers such as piezoresistive transducers, resistive transducers on an alumina substrate, or in the form of diaphragm position sensors such as Hall effect sensors and electromagnetic sensors.
- Another possiblity is to combine sensor elements and circuit elements into a single integrated circuit.
- the senor could be of the piezo-ceramic type or capable of converting the occurring pressure variations into electrical potential variations.
- the reference numeral 8 indicates the position of a power transformer, and 9 indicates the position of a power feed terminal.
- the reference numeral 10 indicates an insulating support for the electronic circuit and sensor.
- the mobile core 6 On feeding the coil 4 from a voltage generator of variable frequency but constant amplitude, the mobile core 6 is caused to oscillate, as is the diaphragm rigid therewith, this having its maximum amplitude when the generated voltage has a frequency equal to the resonance frequency of the mobile resilient part 5, 6 of the device.
- the piezoelectric pressure sensor transforms the pressure variation generated in the air by the rapid movements of the diaphragm into variations in voltage, which is related directly to the amplitude, frequency and phase of its vibrations.
- This sensor therefore assumes the electrical characteristics of a piezoceramic element resonating at the diaphragm frequency.
- it When connected into the reaction circuit of an oscillator circuit, as shown in the schematic diagram of Figure 3, it generates a control signal for the coil 4 having a frequency equal to the resonance frequency of the sound-generating diaphragm 5.
- A indicates a pressure sensor
- B an oscillator circuit
- C an impedance adaptor or a pulse width modifier circuit
- D a pilot amplifier
- E a solid state power switch
- F the control electromagnet for the acoustic diaphragm.
- the electrical schematic diagram of Figure 3 shows the functions of the circuit elements to be used for constructionally optimising the invention.
- the integrated circuit I.C.1 has a typical circuit configuration of a quartz-controlled oscillator. In place of this latter, the sensor 7 (piezoelectric transducer) is connected with the correct polarity for causing the oscillator circuit to resonate at the inherent resonance frequency of the sound-generating electromagnetic system.
- the oscillator ouput is fed to the input of the impedence adaptor and current amplifier I.C.2 (in Figure 2), the output of which controls the final power circuit consisting of the transistors Q1 and Q2, to then control the horn coil 4 or solenoid.
- This particular transistor circuit configuration is provided to reduce the power dissipated by Q2 to a minimum, and at the same time to allow its heat dissipation. This is obtained by connecting the collector (in common with the cooling fin) directly to the metal container 1 of the horn T, which is provided with a resonant diffuser R ( Figure 1).
- I.C.2 can be replaced by a pulse width modulator, so as to obtain sound tone modulation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT293286 | 1986-11-05 | ||
IT02932/86A IT1205507B (it) | 1986-11-05 | 1986-11-05 | Tromba elettromeccanica con eccitazione della membrana sonora pilotata elettronicamente da rilevatori della sua frequenza di risonanza |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0266485A2 true EP0266485A2 (fr) | 1988-05-11 |
EP0266485A3 EP0266485A3 (fr) | 1988-11-02 |
Family
ID=11104011
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87107567A Withdrawn EP0266485A3 (fr) | 1986-11-05 | 1987-05-24 | Trompe électromagnétique avec excitation d'un diaphragme acoustique commandé électroniquement au moyen de capteurs mesurant sa fréquence de résonance |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0266485A3 (fr) |
JP (1) | JPS63124095A (fr) |
IT (1) | IT1205507B (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990000093A1 (fr) * | 1988-06-29 | 1990-01-11 | Infrasonik Ab | Generateur sonore basse frequence, en particuliler pour grills |
US5109212A (en) * | 1989-03-29 | 1992-04-28 | Bruno Cortinovis | Electronically controlled horn for motor vehicles |
EP1008394A1 (fr) * | 1998-06-29 | 2000-06-14 | Matsushita Electric Industrial Co., Ltd. | Convertisseur electrique/mecanique/sonore et appareil de conversion electrique/mecanique/sonore |
EP1383108A1 (fr) * | 2002-07-19 | 2004-01-21 | Mark Thomas Coward | Avertisseur pour génération de son |
WO2005034057A1 (fr) * | 2003-10-09 | 2005-04-14 | Fabbrica Italiana Accumulatori Motocarri Montecchio F.I.A.M.M. S.P.A. | Dispositif d'avertissement audible et procede de fonctionnement |
EP1710022A2 (fr) * | 2005-04-04 | 2006-10-11 | WERMA Signaltechnik GmbH + Co. KG | Dispositif de signal avec capteur de signaux acoustique |
DE102013221182B4 (de) * | 2013-10-18 | 2021-05-06 | Volkswagen Aktiengesellschaft | Akustisches Signalisierungssystem sowie Anordnung und Verfahren zum Betreiben eines akustischen Signalisierungssystems für ein Kraftfahrzeug |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011257685A (ja) * | 2010-06-11 | 2011-12-22 | Hamanako Denso Co Ltd | 警音装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771772A (en) * | 1971-05-15 | 1973-11-13 | K Honda | Ultrasonic cleaning device |
DE2448685A1 (de) * | 1974-10-12 | 1976-04-22 | Bosch Gmbh Robert | Elektromagnetisches signalhorn mit kontaktlos gesteuerter membranbewegung |
US4395665A (en) * | 1981-06-09 | 1983-07-26 | The Arthur G. Russell Company, Incorporated | Control system for vibrating a member at its resonant frequency |
DE3442483A1 (de) * | 1984-11-22 | 1986-05-22 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren zum kontaktlosen steuern der aufschlagfrequenz des schwingankers eines elektromagnetischen signalhorns |
-
1986
- 1986-11-05 IT IT02932/86A patent/IT1205507B/it active
-
1987
- 1987-05-24 EP EP87107567A patent/EP0266485A3/fr not_active Withdrawn
- 1987-06-05 JP JP62141318A patent/JPS63124095A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3771772A (en) * | 1971-05-15 | 1973-11-13 | K Honda | Ultrasonic cleaning device |
DE2448685A1 (de) * | 1974-10-12 | 1976-04-22 | Bosch Gmbh Robert | Elektromagnetisches signalhorn mit kontaktlos gesteuerter membranbewegung |
US4395665A (en) * | 1981-06-09 | 1983-07-26 | The Arthur G. Russell Company, Incorporated | Control system for vibrating a member at its resonant frequency |
DE3442483A1 (de) * | 1984-11-22 | 1986-05-22 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren zum kontaktlosen steuern der aufschlagfrequenz des schwingankers eines elektromagnetischen signalhorns |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990000093A1 (fr) * | 1988-06-29 | 1990-01-11 | Infrasonik Ab | Generateur sonore basse frequence, en particuliler pour grills |
AU626894B2 (en) * | 1988-06-29 | 1992-08-13 | Infrasonik A.B. | Low frequency sound generator, especially for grills |
US5109212A (en) * | 1989-03-29 | 1992-04-28 | Bruno Cortinovis | Electronically controlled horn for motor vehicles |
EP1008394A1 (fr) * | 1998-06-29 | 2000-06-14 | Matsushita Electric Industrial Co., Ltd. | Convertisseur electrique/mecanique/sonore et appareil de conversion electrique/mecanique/sonore |
EP1008394A4 (fr) * | 1998-06-29 | 2005-08-24 | Matsushita Electric Ind Co Ltd | Convertisseur electrique/mecanique/sonore et appareil de conversion electrique/mecanique/sonore |
EP1383108A1 (fr) * | 2002-07-19 | 2004-01-21 | Mark Thomas Coward | Avertisseur pour génération de son |
WO2005034057A1 (fr) * | 2003-10-09 | 2005-04-14 | Fabbrica Italiana Accumulatori Motocarri Montecchio F.I.A.M.M. S.P.A. | Dispositif d'avertissement audible et procede de fonctionnement |
EP1710022A2 (fr) * | 2005-04-04 | 2006-10-11 | WERMA Signaltechnik GmbH + Co. KG | Dispositif de signal avec capteur de signaux acoustique |
EP1710022A3 (fr) * | 2005-04-04 | 2008-07-23 | WERMA Signaltechnik GmbH + Co. KG | Dispositif de signal avec capteur de signaux acoustique |
DE102013221182B4 (de) * | 2013-10-18 | 2021-05-06 | Volkswagen Aktiengesellschaft | Akustisches Signalisierungssystem sowie Anordnung und Verfahren zum Betreiben eines akustischen Signalisierungssystems für ein Kraftfahrzeug |
Also Published As
Publication number | Publication date |
---|---|
JPS63124095A (ja) | 1988-05-27 |
IT8602932A0 (it) | 1986-11-05 |
IT1205507B (it) | 1989-03-23 |
EP0266485A3 (fr) | 1988-11-02 |
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18W | Application withdrawn |
Withdrawal date: 19881121 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: CORTINOVIS, BRUNO Inventor name: GIORGIONI, TULLIO |