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EP0038043B1 - Générateur de signaux pour l'obtention d'un signal acoustique - Google Patents

Générateur de signaux pour l'obtention d'un signal acoustique Download PDF

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Publication number
EP0038043B1
EP0038043B1 EP81102766A EP81102766A EP0038043B1 EP 0038043 B1 EP0038043 B1 EP 0038043B1 EP 81102766 A EP81102766 A EP 81102766A EP 81102766 A EP81102766 A EP 81102766A EP 0038043 B1 EP0038043 B1 EP 0038043B1
Authority
EP
European Patent Office
Prior art keywords
coating
signal generator
generator according
feedback
piezo
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
Application number
EP81102766A
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German (de)
English (en)
Other versions
EP0038043A1 (fr
Inventor
Manfred Dipl.-Ing. Koslar
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT81102766T priority Critical patent/ATE7096T1/de
Publication of EP0038043A1 publication Critical patent/EP0038043A1/fr
Application granted granted Critical
Publication of EP0038043B1 publication Critical patent/EP0038043B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency

Definitions

  • the invention relates to a signal generator for generating an acoustic signal, containing a single or bimorph oscillating piezo-ceramic disk that serves as an electromechanical transducer and is provided with a full-surface main coating and counter-coating, the counter-coating of which, with the exception of one free surface, covers the large opposite side to the main coating of the piezo-ceramic disc and in the free surface a feedback assignment separated by an insulation spacing is arranged, the main assignment of the piezoceramic disk being connected to the output of an active component (transistor), the counter assignment being connected to a potential reference point and the feedback assignment being connected to the input (base) of the active component (transistor), so that these Circuit acts as a feedback amplifier.
  • a signal generator for generating an acoustic signal containing a single or bimorph oscillating piezo-ceramic disk that serves as an electromechanical transducer and is provided with a full-surface main coating and counter-coating, the counter-coating of
  • Unimorphic or bimorphic piezoelectric transducers are known from the catalogs BFE 78-004 A with the title "TDK unimorphic type transducer for electronic buzzer •, July 1978 and BFE 87-006 A with the title:" TDK piezoelectric buzzers •, July 1978 .
  • the piezoelectric element is fastened on a metal plate, which also acts as the main covering.
  • the piezoelectric element in these known transducers consists of piezoceramic material and is in the form of a circular disk. The assignment is also plotted as a circular area on this disc.
  • bimorph transducers the piezoelectric element of which consists of two interconnected piezoelectric ceramic disks, in which the occupancy on one side covers the entire area of the circular disk (main occupancy), while on the other side there are two occupancies separated from each other by an insulating section, one of which serves as a counter assignment and the other as a feedback assignment.
  • the feedback assignment is connected to the base of a transistor, while the main assignment is connected to the output of this transistor and the counter assignment, which covers only part of the end face of the piezoceramic disk, is connected to a potential reference point.
  • the arrangement of the assignments in the known transducers means that, for example, unimorph transducers must have a diameter of approximately 35 mm in order to produce a perceptible sound in the range of audible vibrations (approximately 3.0 kHz) together with a Helmoltz resonator arranged above the piezoelectric flexural vibrator to surrender.
  • Bimorphic piezoelectric transducers of the known type still have a diameter between 16.5 mm and 30 mm in order to give an audio frequency of approximately 3.0 kHz.
  • transducer elements are too large to use these transducer elements as signal generators for generating an acoustic signal if, for example, this signal generator is to be used in a two-handle device for measuring or determining a voltage, as described, for example, in GB-A-1 562 578.
  • an acoustic display means is also to be used, for those cases in which, for example, the light-emitting diodes are not visible due to bright sunlight and the test person should nevertheless receive a warning signal.
  • US-A-2 635 199 describes a piezoelectric crystal device in which electrodes are attached on both sides to a piezoelectric crystal plate made of quartz, which is generally single-crystal.
  • the quartz crystal plate can be circular or rectangular.
  • the electrodes are applied to the entire surface on one side of such a quartz single crystal wafer and on the other side the entire surface is divided into two electrodes. An inner part of this counterelectrode is occupied on the same side by a surface part of another electrode that extends around it.
  • Such piezoelectric crystal devices are used to be used in the MHz range.
  • the arrangement of the electrodes serves to suppress the interference of undesired types of vibration.
  • the present invention is not suggested by this known device because the types of oscillation of a quartz single crystal in the MHz range are different than the types of oscillation in the kHz range for a piezoceramic body, that is to say a polycrystalline body.
  • the latter are beige vibrations, but not any kind of thickness shear vibrations or longitudinal vibrations of the piezoelectric quartz body.
  • a piezoelectric transducer is known as a sound generator, which contains a piezoelectric crystal as a piezoelectric element, for example made of a lead / zirconium / titanium compound, which together with the applied as main, counter and feedback assignment serving electrodes is firmly attached to a base by means of a suitable electrically conductive binder.
  • the feedback assignment is applied to an open area arranged on the edge of the counter assignment. Information on a suitable immovable vibration-capable mounting of the piezoelectric crystal cannot be found in DE-A-2 141 643.
  • the present invention has for its object to provide a signal generator for generating an acoustic signal
  • the electromechanical transducer consists of a piezoceramic disc, the dimensions being as small as possible in well audible tone frequency ranges of the order of about 3 kHz; this converter is to be used in a circuit as a feedback amplifier.
  • the signal transmitter of the type specified at the outset is characterized in that the piezoceramic disk is of rectangular design, that the free area is arranged in the middle of the counter-allocation, and that the piezoceramic disk for immovable vibration-capable mounting transverse to its longitudinal extent in the axes of the vibration nodes is attached elastically.
  • Open spaces and feedback assignment are preferably rectangular in shape with rounded narrow sides, circular or elliptical.
  • the open area can also protrude like a strip from a narrow side of the rectangular piezoceramic disk and contain the feedback assignment in it.
  • the elastic fastening of the piezoceramic disk is preferably carried out by means of rubber rings, which snap around the piezoceramic disk in notches arranged on the longitudinal edges.
  • the rectangular piezoceramic disk is advantageously fastened to a metal plate that exceeds its dimensions, the elastic fastening being carried out on this metal plate (unimorph element).
  • the rubber rings preferably contain electrically conductive segments at the points that come into contact with the coatings and thus provide the current supply to the coatings that act as electrodes.
  • the ceramic disc is advantageously held in such a way that the rubber rings are mounted in V-shaped guide rails.
  • V-shaped guide rails advantageously also serve as a power supply to the conductive segments of the rubber rings.
  • the present invention surprisingly achieves that the dimensions of the rectangular ceramic disk in the order of L.B.D. of about 20 mm, 7 mm, 0.4 mm, whereby an acoustic signal with a frequency of about 3 kHz, which is well audible even with background noise, is nevertheless generated. It is known that it is favorable to amplify the volume of a source generating an audio frequency (here the flexural oscillator) with a Helmholtz resonator which is tuned to the generated audio frequency.
  • an audio frequency here the flexural oscillator
  • Fig. 1 denotes the bimorph transducer consisting of two rectangular piezoceramic disks.
  • the lower ceramic disk is provided with the main covering 9 practically over the entire surface.
  • the counter assignment 2 extends over the entire side of the bimorph converter 1 opposite the main assignment 9.
  • the feedback assignment 4 is arranged within the free space 3 while leaving a distance which serves for isolation.
  • the piezoceramic disk 1 is on a metal plate 8 which projects beyond its dimensions and which, for. B. is made of brass and is well resilient, attached.
  • the metal plate 8 serves as the main assignment.
  • the counter assignment 2 is provided with a free area 3 on the entire large area of the ceramic disk 1.
  • the feedback assignment 4 is plotted inside the open space.
  • the free area within the counter-assignment 2 is circular, as is the feedback assignment 4 arranged therein.
  • Such a rectangular ceramic disk can be stored along its narrow sides because the geometric dimensions are chosen such that the vibration nodes 5 run along the narrow sides.
  • the free area 3 is elliptical within the counter assignment 2, as is the feedback assignment 4 arranged therein.
  • the free surface 3 protrudes from a narrow side 10 of the rectangular piezoceramic disk 1 approximately in the middle of the surface into the counter-assignment 2.
  • the feedback assignment 4 is arranged within this free area.
  • Fig. 5 there are notches 7 on the long sides of the ceramic disc 1 shown, which are attached according to the selected geometric arrangements so that the vibration nodes 5 of the piezoceramic disk 1 are detected.
  • the distances a from the two narrow sides of the rectangular ceramic disk 1 to the vibration nodes 5 each amount to about a quarter of the entire length of this disk, while the distance b between the vibration nodes 5 makes up about 0.5 to 0.55 the length of the piezoceramic disk.
  • FIGS. 6 and 7 show how the piezoceramic disk 1 can advantageously be held along its vibration node planes (cf. FIG. 5).
  • rubber rings 6 are present.
  • the contacts can be made by means of wires, as indicated in FIGS. 1 and 8 by the power supply wires 21 and 22.
  • the rubber rings 6 can also be equipped with conductive segments 11 and 12. Rubber rings with parts made conductive are known per se and are commercially available. The conductivity is determined by storing z. B. causes metal particles.
  • the rubber rings are located in V-shaped guide rails 13 which, due to their extension away from the piezoceramic disk 1, form the required HeImholtz resonator above the bending vibrator.
  • the guide rails 13 optionally also serve as current leads to the conductive segments 11 and 12 of the rubber rings 6.
  • the guide rails 13 are provided with pins 15 and 16 which are connected to the conductor tracks of the printed circuit are soldered (not shown in detail here).
  • FIG. 1 Another type of mounting of the piezo oscillator is shown in FIG.
  • the piezoceramic disk 1 which is attached to a metal plate 8 acting as the main electrode and is provided on the opposite side with the counter electrode 2 and the feedback electrode 4, is above the metal plate 8 in resilient, rail-shaped guides 17 and 18, which are made, for example, of silicone rubber exist, held.
  • a power supply wire 23 serves as the power supply to the metal plate 8, or to the main assignment 9 (FIG. 1), and thus to the ceramic disk 1.
  • the guides 17 and 18 are held by blocks 19 and 20 which, for. B. consist of insulating material and can be part of the housing. This type of mounting of the plate is useful if the vibration node coincides with the edge area of the metal plate 8, as shown in FIG. 3. Blocks 19 and 20 together form the required Helmholtz resonator.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Claims (11)

1. Générateur de signaux pour l'obtention d'un signal acoustique, comportant une plaque piézocéramique uni- ou bimorphe montée de façon à pouvoir osciller, qui est munie d'une armature principale occupant toute la surface et d'une contre-armature et qui sert de transducteur électromécanique, dont la contre-armature (2) recouvre le côté de surface importante de la plaque piézocéramique (1) qui est opposé à l'armature principale (9), à l'exception d'une surface libre (3), et une armature de contre-réaction (4), séparée par une distance d'isolement, qui est disposée dans la surface libre (3), l'armature principale (9) de la plaque piézocéramique (1) étant reliée à la sortie d'un composant actif (transistor), la contre-armature (2) à un point de référence de potentiel et l'armature de contre-réaction (4) à l'entrée (base) du composant actif (transistor) de manière que ce circuit agisse comme un amplificateur à contre-réaction, caractérisé par le fait que la plaque piézocéramique (1) possède une configuration rectangulaire, que la surface libre (3) est disposée au milieu de la contre-armature (2), et que la plaque piézocéramique (1) est fixée élastiquement transversalement par rapport à sa dimension longitudinale au niveau des axes des noeuds d'oscillation pour le montage oscillant sans possibilité de déplacement.
2. Générateur de signaux suivant la revendication 1, caractérisé par le fait que la surface libre (3) et l'armature de contre-réaction (4) possèdent une configuration rectangulaire avec des petits côtés arrondis (figures 1, 2).
3. Générateur de signaux suivant la revendication 1, caractérisé par le fait que la surface libre (3) et l'armature de contre-réaction (4) possèdent une configuration circulaire (figure 3).
4. Générateur de signaux suivant la revendication 1, caractérisé par le fait que la surface libre (3) et l'armature de contre-réaction (4) possèdent une configuration elliptique (figure 4).
5. Générateur de signaux suivant la revendication 1, caractérisé par le fait que la surface libre (3) pénètre sous la forme d'une bande dans la contre-armature (2) à partir d'un petit côté (10) de la plaque piézocéramique rectangulaire (1), et contient à l'intérieur l'armature de contre-réaction (4) (figure 5).
6. Générateur de signaux suivant l'une des revendications 1 à 5, caractérisé par le fait que la fixation élastique a lieu au moyen de bagues en caoutchouc (6) qui entourent la plaque piézocéramique (1) en s'engageant dans des entailles (7) ménagées sur les bords longitudinaux de la plaque piézocéramique (1) (figures 6, 7).
7. Générateur de signaux suivant l'une des revendications 1 à 6, caractérisé par le fait que la plaque piézocéramique rectangulaire (1) est fixée sur une plaque métallique (8) dont les dimensions sont plus importantes, et que la fixation élastique a lieu au niveau de cette plaque métallique (8) (figures 2, 8).
8. Générateur de signaux suivant une ou plusieurs des revendications 1 à 7, caractérisé par le fait que les bagues élastiques (6) comportent des segments conducteurs du point de vue électrique (11, 12) aux endroits qui viennent en contact avec les armatures (3, 4, 9), et assurent par conséquent l'amenée de courant aux armatures (3, 4, 9) servant d'électrodes, sous la forme d'un contact par pression (figure 7).
9. Générateur de signaux suivant l'une des revendications 1 à 8, caractérisé par le fait que la plaque de céramique (1) avec les bagues en caoutchouc (6) sont montées dans des rails de guidage (13) en forme de V (figure 6).
10. Générateur de signaux suivant la revendication 9, caractérisé par le fait que les rails de guidage
(13) en forme de V servent d'amenées de courant aux segments conducteurs (11, 12) des bagues en caoutchouc (6) (figures 6, 7).
EP81102766A 1980-04-10 1981-04-10 Générateur de signaux pour l'obtention d'un signal acoustique Expired EP0038043B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81102766T ATE7096T1 (de) 1980-04-10 1981-04-10 Signalgeber zur erzeugung eines akustischen signals.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3013788A DE3013788C2 (de) 1980-04-10 1980-04-10 Piezokeramikscheibe für einen Signalgeber zur Erzeugung eines akustischen Signals
DE3013788 1980-04-10

Publications (2)

Publication Number Publication Date
EP0038043A1 EP0038043A1 (fr) 1981-10-21
EP0038043B1 true EP0038043B1 (fr) 1984-04-11

Family

ID=6099671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102766A Expired EP0038043B1 (fr) 1980-04-10 1981-04-10 Générateur de signaux pour l'obtention d'un signal acoustique

Country Status (5)

Country Link
EP (1) EP0038043B1 (fr)
JP (1) JPS57500494A (fr)
AT (1) ATE7096T1 (fr)
DE (1) DE3013788C2 (fr)
WO (1) WO1981002963A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3230060C2 (de) * 1981-07-31 1986-07-31 Sumitomo Electric Industries, Ltd., Osaka Piezoelektrischer Summer
JPS63314997A (ja) * 1987-06-18 1988-12-22 Matsushita Electric Ind Co Ltd 圧電発音体
US5881021A (en) * 1997-03-10 1999-03-09 Dreamco Enterprises Inc. Quick charge capacitor powered non-interruptible wearable personal security alarm
DE19902875C1 (de) * 1999-01-25 2000-07-20 Ideal Standard Piezoschallwandler und Badewanne mit einem Piezoschallwandler
JP4203899B2 (ja) * 2002-06-13 2009-01-07 オムロンヘルスケア株式会社 電子体温計
JP2007028469A (ja) * 2005-07-21 2007-02-01 Nec Tokin Corp 音響振動発生素子、音響振動発生素子の製造方法及び音響振動発生装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635199A (en) * 1948-01-08 1953-04-14 John M Wolfskill Piezoelectric crystal apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE623017A (fr) * 1961-09-29
US3495105A (en) * 1967-07-19 1970-02-10 Ngk Spark Plug Co Three-terminal piezoelectric resonator
US3578921A (en) * 1970-01-26 1971-05-18 Sonotone Corp Miniature multiple-diaphragm acoustic mechanoelectric transducer device
CA930211A (en) * 1970-08-20 1973-07-17 Johnson Matthey And Mallory Limited Piezoelectric transducer and noise making device utilizing same
GB1429856A (en) * 1973-03-07 1976-03-31 Taga Electric Co Ltd Transducers
US4122365A (en) * 1976-01-26 1978-10-24 Projects Unlimited, Inc. Piezoelectric buzzer device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635199A (en) * 1948-01-08 1953-04-14 John M Wolfskill Piezoelectric crystal apparatus

Also Published As

Publication number Publication date
JPS57500494A (fr) 1982-03-18
WO1981002963A1 (fr) 1981-10-15
DE3013788C2 (de) 1982-11-25
EP0038043A1 (fr) 1981-10-21
ATE7096T1 (de) 1984-04-15
DE3013788A1 (de) 1981-10-15

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