WO1989000801A1 - Transducteur electro-acoustique - Google Patents

Transducteur electro-acoustique Download PDF

Info

Publication number
WO1989000801A1
WO1989000801A1 PCT/DE1987/000327 DE8700327W WO8900801A1 WO 1989000801 A1 WO1989000801 A1 WO 1989000801A1 DE 8700327 W DE8700327 W DE 8700327W WO 8900801 A1 WO8900801 A1 WO 8900801A1
Authority
WO
WIPO (PCT)
Prior art keywords
membrane
transmitter
transducer according
carrier
piezo element
Prior art date
Application number
PCT/DE1987/000327
Other languages
German (de)
English (en)
Inventor
Reinhardt Fischer
Original Assignee
Reinhardt Fischer
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
Priority to DE19863620557 priority Critical patent/DE3620557A1/de
Priority claimed from DE19863620557 external-priority patent/DE3620557A1/de
Application filed by Reinhardt Fischer filed Critical Reinhardt Fischer
Publication of WO1989000801A1 publication Critical patent/WO1989000801A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • 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

Definitions

  • the invention relates to an electro-acoustic transducer according to the preamble of claim 1.
  • Such an electroacoustic transducer is known from US Pat. No. 3,721,840.
  • a piezo element in the form of a circular disk is applied to a transmitter, the entire edge region of the transmitter being connected to an edge region of a circular membrane, which is formed by an opening provided in the center of the circular membrane.
  • the outer edge of the membrane is attached to a housing or the like. Due to the suspension of the piezo element, however, the vibrations are inhibited so that the amplitudes required for lower tones cannot be generated.
  • the type of suspension of the membrane results in resonance peaks that do not permit the use of the electro-acoustic transducer in the hi-fi range.
  • a loudspeaker with a cylindrical membrane which itself has piezoelectric properties.
  • This piezo membrane is connected via a polyurethane foam to a coaxial support in the form of a perforated metal cylinder.
  • the polyurethane foam serves to suppress or attenuate resonance frequencies, which, however, reduces the efficiency of the loudspeaker. With this loudspeaker, only the high-frequency range can also be emitted.
  • the invention is based on the object of further developing the electro-acoustic transducer of the type mentioned at the outset such that the mid-range which is important in the hi-fi range can be emitted by a single membrane with a balanced frequency response and at the same time high efficiency .
  • the transmitter Since the transmitter is connected to the diaphragm on the one hand and a support on the other at two opposite ends with respect to the piezoelectric element, the full vibration capability of the entire pi-ezodule surface is used, which results in larger deflections and thus lower tones can be achieved.
  • the resonance peaks at 3 and 5 kHz that are typical for the piezo modules are not transmitted to the membrane, since the piezoceramic is only connected to the membrane or the support via two points. Thus, damping to avoid these resonance peaks, e.g. B. in the form of soft materials, so that the advantages of the piezo module, namely fast response and vibration behavior, are retained.
  • the frequency response is so near at high sound pressure 1 i neari si ert.
  • Another advantage of the suspension is that any number of piezo modules can be arranged on the membrane in order to achieve a low frequency response and to increase the sound pressure without these mutually influencing one another.
  • the piezo modules vibrate in a direction that is parallel to the membrane surface and that can be designed to be large enough to achieve low frequencies.
  • Fig. 1 shows a first embodiment in which the membrane is cylindrical in shape
  • FIG. 2 shows a section along line 11-11 in FIG. 1;
  • FIG. 3 shows a detail of FIG. 2 on an enlarged scale
  • Fig. 4 shows another embodiment in which the membrane consists of two semi-cylindrical surfaces and FIG. Another exemplary embodiment in which two hemispherical surfaces are supplemented to form a spherical membrane surface.
  • Fig. 1 shows a first embodiment in which the membrane 1 is substantially cyl inderiformi g.
  • a counter wall 2 is provided which is at a distance from the membrane so that the vibrations of the membrane are not impaired and which counteracts an unintentional, excessive bending of the membrane by external forces.
  • This counter wall 2 represents a tube in this embodiment.
  • a carrier 3 running in the longitudinal direction is formed in the form of an extension.
  • the counter wall 2 is surrounded by the membrane 1 while maintaining a certain distance, a gap 4 remaining in the region of the longitudinal support 3 between the two ends of the membrane and the support 3.
  • This gap 4 is bridged with the aid of piezoelectric elements 5 which are attached to a transformer 6.
  • the membrane 1 is thus freely suspended at one end of the piezo elements 5 or the transmitter 6.
  • the surface of the pi ezoele 5 or the transmitter 6 is essentially tangential to the membrane surface; ie the surface of the piezo element 5 continues the membrane surface, whereby the vibrations of the piezo element 5 are transmitted to the membrane as bending waves.
  • the gap-bridging, spaced-apart piezo elements 5 are connected to one another via lines 7, either in series or in parallel.
  • the membrane 3 shows in detail the coupling of the membrane 1 to the piezo element 5 and its coupling to the carrier 3.
  • the piezo element 5 comes to lie over the gap 4 formed between the membrane 1 and the carrier 3.
  • the sections of the transducer 6 projecting beyond the piezo element 5 on both sides serve to attach them to the carrier 3 or the membrane 1 to concentrate on the ends that serve the connection with the carrier or the membrane.
  • the membrane has a material thickness of approximately 0.05 to 0.20 mm on.
  • the membrane advantageously consists of an aluminum alloy or a hard plastic film.
  • Fig. 4 shows a further embodiment in which the membrane 1 consists of two cylinder segments. Each longitudinal side of the cylinder segment is connected to a carrier 3 via a plurality of piezoelectric elements 5 arranged at the same distance in the longitudinal direction; d. H. A total of two supports are provided which are offset from one another at an angle of 180 °.
  • two pi ezoel elements can be arranged on each transmitter 6, one on the front and one on the rear. The two Pi ezoel emente 5 are driven in phase opposition.
  • FIG. 5 Another embodiment is shown in FIG. 5. This embodiment differs from the previous embodiments in that the membrane 1 'is hemispherical and the carrier is designed as a disk or ring. On the base surface of the disc, a counter wall 2 'in the form of a hemisphere is attached such that a part of the disc protrudes as an edge over the cut surface of the hemisphere attached to it.
  • the hemispherical membrane 1 surrounds the hemispherical counter wall 2 l at a predetermined distance, the outer diameter of the disk essentially corresponding to the outer diameter of the hemispherical membrane 1' and wherein between the outer edge of the disk and the cutting edge of the hemispherical membrane, As in the previous proceedingssbei spi elen a circumferential gap 4 'remains, so that the transducer is freely coupled to the attached along the circumference of the disk Piezoel elements 5' or transmitters 6 1 .
  • a hemispherical structure can also be provided on the rear of the disc, so that the membrane surface 1 'takes on the shape of a sphere overall.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

Transducteur piézoélectrique comportant un piézoélément (5) agencé sur un transformateur (6). Une extrémité du transformateur (6) est connectée à un support (3), l'autre extrémité étant connectée au bord d'une membrane (1) dont la surface est une prolongation de celle du piézoélément (5), de sorte que les vibrations dues aux flexions sont reproduites dans la membrane. De cet agencement résulte un transducteur d'onde de flexion piézoélectrique permettant une adaptation à l'air facile, et opérant sur une large bande de fréquences.
PCT/DE1987/000327 1986-06-19 1987-07-21 Transducteur electro-acoustique WO1989000801A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19863620557 DE3620557A1 (de) 1986-06-19 1986-06-19 Elektroakustischer wandler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19863620557 DE3620557A1 (de) 1986-06-19 1986-06-19 Elektroakustischer wandler

Publications (1)

Publication Number Publication Date
WO1989000801A1 true WO1989000801A1 (fr) 1989-01-26

Family

ID=6303266

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1987/000327 WO1989000801A1 (fr) 1986-06-19 1987-07-21 Transducteur electro-acoustique

Country Status (1)

Country Link
WO (1) WO1989000801A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117078A (en) * 1990-02-02 1992-05-26 Beckett Industries Inc. Controlled heating of foodstuffs by microwave energy
DE4109169A1 (de) * 1991-03-20 1992-09-24 Koehler Chemie Dr Franz Wasserloesliche nicht ionische roentgenkontrastmittel sowie mittel und verfahren zu ihrer herstellung
EP0969691A1 (fr) * 1998-01-16 2000-01-05 Sony Corporation Haut-parleur et appareil electronique utilisant un haut-parleur

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2019219A1 (fr) * 1968-09-30 1970-06-26 Philips Nv
US4079213A (en) * 1977-04-21 1978-03-14 Essex Group, Inc. Piezoelectric transducer having improved low frequency response
EP0063094A1 (fr) * 1981-04-01 1982-10-20 Siegfried Dr. Klein Haut-parleur pour fréquences aigues
EP0075911A1 (fr) * 1981-09-28 1983-04-06 Siegfried Dr. Klein Haut-parleur, en particulier haut-parleur d'aigues
DE3306801A1 (de) * 1983-02-26 1984-09-06 Rainer J. 5000 Köln Haas Kugelfoermiger hochtonlautsprecher mit piezoelektrischern antrieb
US4651044A (en) * 1978-08-17 1987-03-17 Kompanek Harry W Electroacoustical transducer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2019219A1 (fr) * 1968-09-30 1970-06-26 Philips Nv
US4079213A (en) * 1977-04-21 1978-03-14 Essex Group, Inc. Piezoelectric transducer having improved low frequency response
US4651044A (en) * 1978-08-17 1987-03-17 Kompanek Harry W Electroacoustical transducer
EP0063094A1 (fr) * 1981-04-01 1982-10-20 Siegfried Dr. Klein Haut-parleur pour fréquences aigues
EP0075911A1 (fr) * 1981-09-28 1983-04-06 Siegfried Dr. Klein Haut-parleur, en particulier haut-parleur d'aigues
DE3306801A1 (de) * 1983-02-26 1984-09-06 Rainer J. 5000 Köln Haas Kugelfoermiger hochtonlautsprecher mit piezoelektrischern antrieb

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5117078A (en) * 1990-02-02 1992-05-26 Beckett Industries Inc. Controlled heating of foodstuffs by microwave energy
DE4109169A1 (de) * 1991-03-20 1992-09-24 Koehler Chemie Dr Franz Wasserloesliche nicht ionische roentgenkontrastmittel sowie mittel und verfahren zu ihrer herstellung
EP0969691A1 (fr) * 1998-01-16 2000-01-05 Sony Corporation Haut-parleur et appareil electronique utilisant un haut-parleur
EP0969691A4 (fr) * 1998-01-16 2006-04-12 Sony Corp Haut-parleur et appareil electronique utilisant un haut-parleur

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