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EP0038043A1 - 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
EP0038043A1
EP0038043A1 EP81102766A EP81102766A EP0038043A1 EP 0038043 A1 EP0038043 A1 EP 0038043A1 EP 81102766 A EP81102766 A EP 81102766A EP 81102766 A EP81102766 A EP 81102766A EP 0038043 A1 EP0038043 A1 EP 0038043A1
Authority
EP
European Patent Office
Prior art keywords
assignment
signal generator
generator according
feedback
piezoceramic
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.)
Granted
Application number
EP81102766A
Other languages
German (de)
English (en)
Other versions
EP0038043B1 (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, comprising a piezoelectric ceramic disk which is used as an electromechanical transducer and is provided with metal coatings and has a unimodal or bimorph oscillating vibration, the main coating of which covers one of its two large sides practically over the entire surface with the output of an active component (transistor ), whose counter-assignment, which only covers part of the other large-area side, is connected to a potential reference point and whose feedback assignment, which covers the other part of this side while leaving an insulation distance, are connected to the input (base) of the active component (transistor), so that this circuit acts as a feedback amplifier (emitter follower).
  • a signal generator for generating an acoustic signal comprising a piezoelectric ceramic disk which is used as an electromechanical transducer and is provided with metal coatings and has a unimodal or bimorph oscillating vibration, the main coating of which covers one of its two large sides practically over the entire surface with the output of
  • Unimorphic or bimorphic piezoelectric transducers are known from the catalogs BFE 78-004 A with the title: "TDK unimorph type transducer for electronic buzzer” and BFE 87 -006 A (7/1978) with the title: “TDK piezoelectric buzzers”.
  • the piezoelectric element is attached to a metal plate, which also acts as the main assignment.
  • the piezoelectric element in these known transducers consists of piezoceramic material and is circular disk-shaped. The assignment is also plotted as a circular area on this disc.
  • bimorph transducers whose piezoelectric element consists of two interconnected ones Piezoelectric, ceramic disks exist, in which the assignment on one side covers the entire area of the circular disk (main assignment), while on the other side there are two assignments separated by an insulating section, one of which serves as counter assignment and the other as 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 (approx. 3.0 kHz) together with a Helmholtz resonator arranged above the piezoelectric bending vibrator 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 device for measuring or determining a voltage consisting of two handles, as described, for example, in GB-PS1 1,562 578 (VPA 77 P 8011) is described.
  • 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 is nevertheless to receive a warning signal.
  • US Pat. No. 2,635,199 describes a piezoelectric crystal device in which electrodes are attached to both sides of 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 the. To suppress interference from 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 bending vibrations, but not any kind of thickness shear vibrations or longitudinal vibrations of the piezoelectric quartz body.
  • the present invention has for its object to provide a signal generator for generating an acoustic signal, the electromechanical converter from one Piezoceramic disk exists, the dimensions being as small as possible, even in the clearly audible audio frequency range 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 rectangular in shape, that the counter-assignment, with the exception of a free area provided in its center, covers the large opposite side to the main assignment of the piezoceramic disk, that the feedback assignment is arranged in the free area and that the piezoceramic disk is elastically fastened transversely to its longitudinal extent in the axes of the so-called vibration knot for non-lockable vibration-capable mounting.
  • the free area and feedback assignment are preferably rectangular in shape with rounded narrow sides, circular or elliptical.
  • the open area can also protrude from the narrow side of the rectangular piezoceramic disk into the counter-assignment in strips and contain the feedback assignment in it.
  • the piezoceramic disk is preferably elastically fastened 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 contain in the places that with the Be Layings come into contact, preferably electrically conductive segments and thus result in the current supply to the assignments acting 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 are of the order L ⁇ W ⁇ D of about 20mm ⁇ 7mm ⁇ 0.4mm, whereby an acoustic signal with a frequency of about 3 kHz is 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.
  • 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 exceeds its dimensions and which, e.g. is made of brass and is well sprung.
  • 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 free area.
  • 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 projects approximately from a narrow side 10 of the rectangular piezoceramic disk 1 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.
  • the ceramic disc 1 is shown, which are attached according to the selected geometric arrangements so that the vibration nodes 5 of the piezoceramic disc 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 (see FIG. 5).
  • the contacts can be made by means of wires, as indicated in FIG. 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 e.g. Metal particles causes.
  • the rubber rings lie in V-shaped guide rails 13 which, by extending them from the piezoceramic disc 1, form the required Helmholtz resonator above the bending vibrator.
  • the guide rails 13 may also serve at the same time 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 board are soldered (not shown in detail here).
  • FIG. Die.Piezokeramikin 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 on the metal plate 8 in resilient, rail-shaped guides 17 and 18, for example made of silicone Rubber, held.
  • the power supply to the metal plate 8 and thus to the ceramic disk 1 is: a power supply wire 23.
  • the guides 17 and 18 are held by blocks 19 and 20 which, for example. 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)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
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
DE3013788 1980-04-10
DE3013788A DE3013788C2 (de) 1980-04-10 1980-04-10 Piezokeramikscheibe für einen Signalgeber zur Erzeugung eines akustischen Signals

Publications (2)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040857A1 (fr) * 1997-03-10 1998-09-17 Dreamco Enterprises Inc. Alarme de protection personnelle, portative, ne pouvant etre interrompue, commandee par un condensateur a charge rapide

Families Citing this family (5)

* 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
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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH415759A (de) * 1961-09-29 1966-06-30 Siemens Ag Elektroakustischer Wandler
GB1190304A (en) * 1967-07-19 1970-05-06 Nippon Tokushu Togyo Kabushiki Three-Terminal Piezoelectric Resonator
US3578921A (en) * 1970-01-26 1971-05-18 Sonotone Corp Miniature multiple-diaphragm acoustic mechanoelectric transducer device
DE2141643A1 (de) * 1970-08-20 1972-03-23 Mallory & Co Inc P R Schallerzeuger
GB1429856A (en) * 1973-03-07 1976-03-31 Taga Electric Co Ltd Transducers
DE2702381A1 (de) * 1976-01-26 1977-07-28 Projects Unlimited Inc Piezoelektrischer schnarrsummer

Family Cites Families (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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH415759A (de) * 1961-09-29 1966-06-30 Siemens Ag Elektroakustischer Wandler
GB1190304A (en) * 1967-07-19 1970-05-06 Nippon Tokushu Togyo Kabushiki Three-Terminal Piezoelectric Resonator
DE1766790A1 (de) * 1967-07-19 1972-03-16 Ngk Spark Plug Co Dreipoliger piezoelektrischer Resonator
US3578921A (en) * 1970-01-26 1971-05-18 Sonotone Corp Miniature multiple-diaphragm acoustic mechanoelectric transducer device
DE2141643A1 (de) * 1970-08-20 1972-03-23 Mallory & Co Inc P R Schallerzeuger
GB1429856A (en) * 1973-03-07 1976-03-31 Taga Electric Co Ltd Transducers
DE2702381A1 (de) * 1976-01-26 1977-07-28 Projects Unlimited Inc Piezoelektrischer schnarrsummer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040857A1 (fr) * 1997-03-10 1998-09-17 Dreamco Enterprises Inc. Alarme de protection personnelle, portative, ne pouvant etre interrompue, commandee par un condensateur a charge rapide
US5881021A (en) * 1997-03-10 1999-03-09 Dreamco Enterprises Inc. Quick charge capacitor powered non-interruptible wearable personal security alarm

Also Published As

Publication number Publication date
DE3013788A1 (de) 1981-10-15
JPS57500494A (fr) 1982-03-18
EP0038043B1 (fr) 1984-04-11
DE3013788C2 (de) 1982-11-25
WO1981002963A1 (fr) 1981-10-15
ATE7096T1 (de) 1984-04-15

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