EP0432558B1 - Piezoelectric transducer unit for telephone sets - Google Patents

Piezoelectric transducer unit for telephone sets Download PDF

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Publication number
EP0432558B1
EP0432558B1 EP90122558A EP90122558A EP0432558B1 EP 0432558 B1 EP0432558 B1 EP 0432558B1 EP 90122558 A EP90122558 A EP 90122558A EP 90122558 A EP90122558 A EP 90122558A EP 0432558 B1 EP0432558 B1 EP 0432558B1
Authority
EP
European Patent Office
Prior art keywords
projection
plate
dome
carrier
piezoelectric transducer
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 - Lifetime
Application number
EP90122558A
Other languages
German (de)
French (fr)
Other versions
EP0432558A3 (en
EP0432558A2 (en
Inventor
Tomas Jan Dr. Ing. Andert
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
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0432558A2 publication Critical patent/EP0432558A2/en
Publication of EP0432558A3 publication Critical patent/EP0432558A3/en
Application granted granted Critical
Publication of EP0432558B1 publication Critical patent/EP0432558B1/en
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • each dome-like approach in the area of the opening has a step-like approach, which comes to rest on the edge area of the opening in the interior of the housing.
  • the dome-like approach can be cylindrical, with the free end projecting beyond the opening.
  • the free end of the dome-like approach can be designed to be tapered.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Connector Housings Or Holding Contact Members (AREA)

Description

Die vorliegende Erfindung beinhaltet eine piezoelektrische Wandlerkapsel für Fernsprechgeräte mit einer in einem durch eine Fassung und einem topfartigen Boden gebildeten metallischen Gehäuse angeordneten Wandlerplatte, die durch eine Trägerplatte und eine beidseitig mit Elektroden versehene piezoelektrische Scheibe gebildet ist, wobei die Trägerplatte in ihrem Randbereich zwischen einem Ansatz einer aus Isoliermaterial bestehenden Trennplatte und einem Ansatz eines ebenfalls aus Isoliermaterial bestehenden Trägers eingespannt ist.The present invention includes a piezoelectric transducer capsule for telephones with a transducer plate arranged in a metallic housing formed by a holder and a pot-like base, which is formed by a carrier plate and a piezoelectric disk provided on both sides with electrodes, the carrier plate in its edge region between a shoulder a separating plate made of insulating material and an attachment of a carrier also made of insulating material is clamped.

Bei einer durch die DE-U-81 20 515 bekannten Ausführungsform einer Wandlerkapsel wird die Kontaktierung zu den Elektroden zu der piezoelektrischen Scheibe über mit den Elektroden verbundene elastische und elektrisch leitfähige Bändchen hergestellt, die über Lötverbindungen mit im Gehäuse der Wandlerkapsel vorgesehenen Messerkontakten verbunden sind. Infolge des Schwingungsverhaltens der Wandlerplatte sind die relativ dünnen leitfähigen Bändchen äußerst bruchgefährdet. Weiterhin ist die Herstellung der Lötverbindung kosten- und fertigungsaufwendig.In one embodiment of a transducer capsule known from DE-U-81 20 515, the contacting to the electrodes to the piezoelectric disk is made via elastic and electrically conductive tapes connected to the electrodes, which are connected via solder connections to knife contacts provided in the housing of the transducer capsule. Due to the vibration behavior of the transducer plate, the relatively thin conductive tapes are extremely prone to breakage. Furthermore, the production of the soldered connection is costly and expensive to manufacture.

Zur Halterung der Messerkontakte ist eine von außen auf den topfartigen Boden aufgebrachte Kunststoffplatte vorgesehen, die im Bereich der Kontaktmesser in das Gehäuseinnere der Kapsel weisende Ansätze besitzt. Diese Ansätze durchdringen Ausnehmungen des Gehäusebodens, wobei die Kunststoffplatte weiterhin mehrere Zapfen besitzt, mittels derer eine Befestigung der Kunststoffplatte mit dem Boden bewirkt wird. Dabei ragen die Messerkontakte durch ihnen konturmäßig angepaßte Durchbrüche der Ansätze hindurch.To hold the knife contacts, a plastic plate is provided from the outside onto the pot-like bottom, which has approaches in the area of the contact knife that point into the interior of the capsule. These lugs penetrate recesses in the housing base, the plastic plate also having a plurality of pins by means of which the plastic plate is secured to the base. The knife contacts protrude through breakthroughs of the projections that are adapted to their contours.

Aufgabe der vorliegenden Erfindung ist es nun, eine Halterung für die Messerkontakte zu schaffen, die kostengünstiger herstellbar ist.The object of the present invention is now a holder to create for the knife contacts, which is cheaper to produce.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß der Träger einstückig mit ihm verbundene durch Durchbrüche in dem topfartigen Boden der Kapsel hindurchgeführte domartige Ansätze zur Aufnahme der Messerkontakte besitzt.According to the invention, this object is achieved in that the carrier has dome-like approaches for receiving the knife contacts which are connected to it in one piece and through openings in the pot-like base of the capsule.

Durch eine derartige Gestaltung der Halterung der Messerkontakte kann durch Einbeziehung des im Kapselinneren bereits vorhandenen Trägers das zuvor erwähnte zusätzliche Bauteil in Form der Kunststoffplatte entfallen, ohne daß der mechanische Schutz der Kontakte beim Aufbringen der entsprechenden Verbindungsstecker vernachlässigt wird. Zum Zweck der akustischen Abdichtung weist jeder domartige Ansatz im Bereich des Durchbruches jeweils einen stufenförmig abgesetzten Ansatz auf, der an dem Randbereich des Durchbruches im Gehäuseinneren zur Anlage gelangt. Dabei kann der domartige Ansatz zylinderförmig ausgebildet sein, wobei das freie Ende den Durchbruch überragt. Weiterhin kann das freie Ende des domartigen Ansatzes konisch zulaufend gestaltet sein. Dadurch wird insbesondere bei automatisierter Fertigung der Kapsel eine sichere Einbringung des Doms in den Gehäuseboden auch bei toleranzbedingten Abweichungen gewährleistet, so daß die akustische Dichtheit zwischen dem Innenraum der Kapsel und dem Außenbereich sichergestellt ist.By designing the holder of the knife contacts in this way, the aforementioned additional component in the form of the plastic plate can be eliminated by including the carrier already present in the interior of the capsule, without neglecting the mechanical protection of the contacts when the corresponding connecting plug is applied. For the purpose of acoustic sealing, each dome-like approach in the area of the opening has a step-like approach, which comes to rest on the edge area of the opening in the interior of the housing. The dome-like approach can be cylindrical, with the free end projecting beyond the opening. Furthermore, the free end of the dome-like approach can be designed to be tapered. As a result, in particular in the automated manufacture of the capsule, a secure insertion of the dome into the housing base is ensured even in the event of deviations due to tolerances, so that the acoustic tightness between the interior of the capsule and the exterior is ensured.

Die Erfindung soll im folgenden anhand eines Ausführungsbeispieles näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment.

Die Abbildung zeigt eine Hälfte einer rotationssymmetrisch aufgebauten piezoelektrischen Wandlerkapsel in einer geschnittenen Seitenansicht.The figure shows a half of a rotationally symmetrical piezoelectric transducer capsule in a sectional side view.

Die in der Abbildung dargestellte Wandlerkapsel 1 besteht aus einem zweiteiligen metallischen Gehäuse mit einem topfartig gestalteten Boden 2 und einer mit diesem durch Umbördeln verbundenen und die Schalldurchlaßöffnungen aufweisenden Fassung 3.The transducer capsule 1 shown in the illustration consists of a two-part metallic housing with a cup-shaped bottom 2 and a socket 3 connected to it by flanging and having the sound passage openings.

Im Innenraum dieses Gehäuses befindet sich eine Wandlerplatte 4, die aus einer Trägerplatte 5 und einer darauf aufgebrachten beidseitig mit Elektroden versehenen piezoelektrischen Scheibe 6 besteht.In the interior of this housing there is a transducer plate 4, which consists of a carrier plate 5 and a piezoelectric disk 6 provided on both sides with electrodes.

In ihrem Randbereich ist die Wandlerplatte 4 zwischen einem Ansatz 7 einer Trennplatte 8 und einem dazu versetzten Ansatz 9 eines Trägers 10 fest gelagert. Der Träger 10 bildet eine Aufnahme 11 für einen Messerkontakt 12. Diese Aufnahme 11 wird durch einen mit dem Träger 10 einstückig verbundenen domartigen Ansatz 13 gebildet, der durch einen Durchbruch 14 im topfartigen Boden 2 hindurchragt und mit einem stufenförmig abgesetzten Bereich 15 an dem Randbereich des Durchbruches 14 im Gehäuseinneren zur Anlage gelangt.In its edge region, the transducer plate 4 is fixedly mounted between a shoulder 7 of a partition plate 8 and a shoulder 9 of a carrier 10 offset from it. The carrier 10 forms a receptacle 11 for a knife contact 12. This receptacle 11 is formed by a dome-like extension 13 which is integrally connected to the carrier 10 and which projects through an opening 14 in the pot-like base 2 and has a stepped region 15 at the edge region of the Breakthrough 14 in the housing interior comes to the plant.

Der Messerkontakt 12 selbst ist im wesentlichen L-förmig ausgebildet. Sein in Richtung auf den topfartigen Boden 2 weisender Endbereich 16 besitzt einen herausgedrückten Lappen 17, der hinter der Aufnahme 11 des Trägers 10 verrastend zur Anlage gelangt. Das Gegenlager für die Rastverbindung wird durch einen gewölbten Ansatz 18 gebildet, der Bestandteil des Trägers 10 ist und in Richtung auf die Wandlerplatte 4 weist. An diesem gewölbten Ansatz 18 liegt der kürzere Schenkel 19 des L-förmigen Messerkontaktes 12 im Punkt A linienförmig an. Das andere freie Ende 20 des Messerkontaktes 12 ist bogenförmig gestaltet und liegt unter Vorspannung an den elektrischen Zuführungen zu den Elektroden der piezoelektrischen Scheibe 6 an. Dieses freie Ende des Schenkels 19 bildet somit ein elastisches Gegenlager zu der starren, durch den Ansatz 7 gebildeten Lagerstelle der Trennplatte 8.The knife contact 12 itself is essentially L-shaped. Its end region 16, which points in the direction of the pot-like base 2, has a pressed-out tab 17, which engages in a latching manner behind the receptacle 11 of the carrier 10. The counter bearing for the latching connection is formed by a curved projection 18, which is part of the carrier 10 and points in the direction of the transducer plate 4. The shorter leg 19 of the L-shaped knife contact 12 bears linearly at point A on this curved projection 18. The other free end 20 of the knife contact 12 is designed in an arc shape and bears against the electrical leads to the electrodes of the piezoelectric disk 6 under pretension. This free end of the leg 19 thus forms an elastic counter bearing to the rigid bearing point of the separating plate 8 formed by the extension 7.

Claims (4)

  1. Piezoelectric transducer unit (1) for telephone sets having a transducer plate (4) arranged in a metallic housing formed by a holder (3) and a pot-like bottom (2), which transducer plate is formed by a carrier plate (5) and a piezoelectric disc (6) provided on both sides with electrodes, the carrier plate being clamped in its edge region between a projection (7) of a separating plate (8), consisting of insulating material, and a projection (9) of a carrier (10), also consisting of insulating material, characterized in that the carrier (10), for accommodating the blade contacts (12), has dome-like projections (13) integrally connected to it and passed through penetrations (14) in the pot-like bottom (2) of the unit (1).
  2. Piezoelectric transducer unit according to Claim 1, characterized in that each dome-like projection (13) exhibits in the area of the penetration (14) a projection (15) which has the form of a stepped shoulder and rests against the edge region of the penetration (14) in the interior of the housing.
  3. Piezoelectric transducer unit according to Claim 1, characterized in that the dome-like projection (13) is constructed to be cylindrical, the free end protruding past the penetration (14).
  4. Piezoelectric transducer unit according to Claim 3, characterized in that the free end of the dome-like projection (13) is designed to be conically tapered.
EP90122558A 1989-12-15 1990-11-26 Piezoelectric transducer unit for telephone sets Expired - Lifetime EP0432558B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8914783U DE8914783U1 (en) 1989-12-15 1989-12-15 Piezoelectric transducer capsule for telephones
DE8914783U 1989-12-15

Publications (3)

Publication Number Publication Date
EP0432558A2 EP0432558A2 (en) 1991-06-19
EP0432558A3 EP0432558A3 (en) 1992-03-04
EP0432558B1 true EP0432558B1 (en) 1994-06-15

Family

ID=6845527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90122558A Expired - Lifetime EP0432558B1 (en) 1989-12-15 1990-11-26 Piezoelectric transducer unit for telephone sets

Country Status (3)

Country Link
EP (1) EP0432558B1 (en)
DE (2) DE8914783U1 (en)
ES (1) ES2055279T3 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3402657A1 (en) * 1984-01-26 1985-08-01 Siemens AG, 1000 Berlin und 8000 München Piezoelectric transducer
DE8902174U1 (en) * 1989-02-23 1989-04-13 Siemens AG, 1000 Berlin und 8000 München Electroacoustic transducer

Also Published As

Publication number Publication date
EP0432558A3 (en) 1992-03-04
EP0432558A2 (en) 1991-06-19
ES2055279T3 (en) 1994-08-16
DE59006140D1 (en) 1994-07-21
DE8914783U1 (en) 1990-02-15

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