WO1981002963A1 - Dispositif pour produire un signal acoustique - Google Patents

Dispositif pour produire un signal acoustique Download PDF

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Publication number
WO1981002963A1
WO1981002963A1 PCT/DE1981/000056 DE8100056W WO8102963A1 WO 1981002963 A1 WO1981002963 A1 WO 1981002963A1 DE 8100056 W DE8100056 W DE 8100056W WO 8102963 A1 WO8102963 A1 WO 8102963A1
Authority
WO
WIPO (PCT)
Prior art keywords
assignment
signal generator
feedback
generator according
rubber rings
Prior art date
Application number
PCT/DE1981/000056
Other languages
German (de)
English (en)
Inventor
M Koslar
Original Assignee
Siemens Ag
M Koslar
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, M Koslar filed Critical Siemens Ag
Publication of WO1981002963A1 publication Critical patent/WO1981002963A1/fr

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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

  • Signal generator for generating an acoustic signal.
  • the invention relates to a signal generator for generating an acoustic signal, containing a single or bimorph oscillating piezoelectric ceramic disk serving as an electromechanical transducer and provided with metal coatings, 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, containing a single or bimorph oscillating piezoelectric ceramic disk serving as an electromechanical transducer and provided with metal coatings, 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
  • Unimorphic or bimorphic piezoelectric transducers are known from the catalogs BEE 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 in the form of a circular disk. The assignment is also plotted as a circular area on this disc.
  • bimorph transducers whose piezoelectric element, however, consists of two interconnected Bck 1 Lk / 3.4.1980
  • 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.
  • 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 about 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-PS 1562578 ( 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 to suppress the interference of undesired types of vibration.
  • the present invention is not suggested by this known device because the types of vibration of a quartz single crystal in the MHz range are different than the types of vibration 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 easily 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 according to the invention 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 vibration nodes for the immovable vibration-capable mounting.
  • the free space and feedback assignment are preferably rectangular in shape with rounded narrow sides, circular or elliptical.
  • the free 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 elastic fastening of the piezoceramic disk is preferably carried out by means of rubber rings which loop around the piezoceramic disk in a notch arranged in the longitudinal edges.
  • the rectangular piezoceramic disk is advantageously fastened on 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 Contact, preferably electrically conductive segments and thus result in the supply of current to the coatings 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 disc in the order of L.B.D of about
  • Figure 1 shows a bimorph piezoelectric transducer.
  • 2 shows a unimorph converter
  • FIG. 3 shows a plan view of a rectangular transducer, the vibration nodes being shown
  • FIG. 4 shows a rectangular converter with a differently shaped free area
  • 5 shows a rectangular transducer with a further different configuration of the open area
  • 6 the attachment of the transducer according to the invention
  • 7 shows the fastening of the transducer according to the invention in section VII-VII in FIG. 6
  • Fig. 8 shows another embodiment of the attachment of the rectangular converter.
  • Fig. 1 denotes the bimorph transducer consisting of two rectangular piezoceramic disks. Towards the drawing level, the lower ceramic disk is provided with the main covering 9 practically over the entire surface.
  • the counter assignment 2 extends with the exception of the free area 3 on the entire side of the dimorphic converter 1 opposite the main assignment 9
  • Free space 3 - the feedback assignment 4 is arranged - leaving a distance which serves for insulation.
  • the piezoceramic disk 1 is on a metal plate 8 which projects beyond 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 open space.
  • the free area within the counter slip 2 is circular, as is the one arranged therein
  • 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.
  • notches 7 are shown on the long sides of the ceramic disc 1, 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 is 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 contacting of the assignments can be carried out 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 caused by the storage of metal particles, for example.
  • the rubber rings lie in V-shaped guide rails 13 which, by extending them from the piezoceramic disk 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 are soldered (not shown in detail here).
  • Fig. 8 another type of mounting the piezo vibrator is shown.
  • the piezoceramic disc 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 via the metal plate 8 in resilient, rail-shaped guides 17 and 18, which are made, for example, of silicone rubber , held.
  • a power supply wire 23 serves as the power supply to the metal plate 8 and thus to the ceramic disk 1.
  • the guides 17 and 18 are held by blocks 19 and 20, which consist, for example, 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)

Abstract

Il est propose un dispositif pour la production de signaux acoustiques qui utilise comme element tranducteur electromecanique une plaque de ceramique quadrangulaire piezo-electrique (1) qui est recouverte sur la face opposee a la couche principale (9) par une couche presentant en son centre une ouverture (3) prevue pour la couche de couplage reactif (4).
PCT/DE1981/000056 1980-04-10 1981-04-10 Dispositif pour produire un signal acoustique WO1981002963A1 (fr)

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 (1)

Publication Number Publication Date
WO1981002963A1 true WO1981002963A1 (fr) 1981-10-15

Family

ID=6099671

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1981/000056 WO1981002963A1 (fr) 1980-04-10 1981-04-10 Dispositif pour produire 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 (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 (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

Also Published As

Publication number Publication date
EP0038043B1 (fr) 1984-04-11
JPS57500494A (fr) 1982-03-18
DE3013788C2 (de) 1982-11-25
DE3013788A1 (de) 1981-10-15
ATE7096T1 (de) 1984-04-15
EP0038043A1 (fr) 1981-10-21

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