EP0170172B1 - Relais piézoélectrique - Google Patents

Relais piézoélectrique Download PDF

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Publication number
EP0170172B1
EP0170172B1 EP85109068A EP85109068A EP0170172B1 EP 0170172 B1 EP0170172 B1 EP 0170172B1 EP 85109068 A EP85109068 A EP 85109068A EP 85109068 A EP85109068 A EP 85109068A EP 0170172 B1 EP0170172 B1 EP 0170172B1
Authority
EP
European Patent Office
Prior art keywords
bending transducer
leaf spring
spring
bearing
relay according
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
EP85109068A
Other languages
German (de)
English (en)
Other versions
EP0170172A1 (fr
Inventor
Klaus Dipl.-Ing. Lüneburger
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
Publication of EP0170172A1 publication Critical patent/EP0170172A1/fr
Application granted granted Critical
Publication of EP0170172B1 publication Critical patent/EP0170172B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H57/00—Electrostrictive relays; Piezoelectric relays

Definitions

  • the invention relates to a piezoelectric relay with a bending transducer clamped on one side according to the first part of patent claim 1.
  • a piezoceramic relay which is constructed according to the first part of the main claim.
  • This relay has an electrostrictive or piezoceramic element which is arranged parallel to a contact arm which can be pivoted about a bearing point. The free end of the piezoceramic element engages the short lever of the contact arm in order to achieve the desired large contact stroke.
  • both the contact arm itself and a V-shaped tilting spring engaging it are designed and arranged in a relatively complicated manner.
  • a piezoelectric toggle switch is also known, in which, in one embodiment, a piezoelectric bender and an elongated contact element are arranged parallel to one another and clamped in with opposite ends.
  • the clamped end of the contact element is offset there beyond the free end of the piezo transducer, while the free end of the piezo transducer engages the contact element via lateral stop elements and switches it to one side or the other in accordance with its respective deformation. Since the contact element is firmly clamped at one end in the manner mentioned and only lateral forces are exerted on this contact element by the piezo element, this contact element must contain an additional tilting device, which, however, is not further explained in this example. In any case, a simple leaf spring cannot produce a tilting characteristic with the structure mentioned.
  • the object of the invention is to provide a piezoelectric relay of the type mentioned, in which a KraftWeg characteristic as an electromagnetic relay can be realized in a simple and space-saving construction.
  • this object is achieved in that the spring element of the tilting device acts directly on the bearing point of the leaf spring in its longitudinal direction.
  • the relatively small deflection of the bending transducer can be converted by the lever action into the switching movement of the contact spring that is necessary for a relay.
  • the clamping point of the bending transducer and the bearing point of the contact leaf spring are arranged symmetrically, a bistable or a monostable switching characteristic is achieved.
  • a sliding-edge bearing formed by the spring element can form the bearing point for the leaf spring.
  • the point of application of the bending transducer to the leaf spring can also be designed as a cutting edge bearing.
  • the leaf spring can be U-shaped with two spring legs lying in one plane, the bending transducer between the two spring legs lying approximately in the same plane, i. That is, that both the spring legs of the leaf spring and the bending transducer go through a common plane of symmetry with each switching movement.
  • the two spring legs can also form two independent contact springs, electrically separated from one another, which are connected in the area of the bearing point, for example, to an insulating material carrier.
  • a permanent magnet arrangement can be provided which generates or amplifies the tilting characteristic of the relay.
  • Fig. 1 shows schematically the structure of a piezoelectric relay with a bending transducer 1, which is clamped at one end 1a in a housing 2. With the other end 1b, the bending transducer engages a contact spring 3 which is designed as a leaf spring and which is movably mounted with its end 3a in a bearing point 4 and with its other end 3b can be switched between two counter-contact elements 5.
  • the distance between the point of attack 6 of the bending actuator on the contact spring 3 and the bearing point 4 is small compared to the total length of the contact spring 3, so that a relatively small movement of the bending transducer 1 or its end 1b due to the leverage a relatively large movement of the free end 3b of the contact spring 3 results.
  • the contact spring 3 is subjected to an axial force.
  • a spring element 7 acts approximately in the longitudinal direction of the bending transducer 1 or the contact spring 3 on the bearing point 4, which strives to shorten the distance between the bearing point 4 and the clamping point of the bending transducer 1.
  • the contact spring is biased from the unstable middle position into the two end positions.
  • the arrangement of the spring element 7 and the coupling of the spring element with the contact spring 3 must be such that it is not possible to move the bearing point 4 to the side.
  • Fig. 2 shows a modification of the structure of Fig. 1, with which a monostable switching behavior of the relay is achieved. All parts are designed and connected as before. Only the bearing point 4a is shifted from the central plane to the left relative to the bearing point 4 of FIG. 1. This gives the contact spring 3 a stable end position in the continuously drawn position, while the opposite position, which is shown in dashed lines, is only maintained as long as the bending transducer 1 assumes the position shown in dashed lines. If the bending transducer moves into a central position (not shown) after the voltage has been switched off, the contact spring returns to the (right) position, while in the case of a structure according to FIG. 1 the position reached in each case is maintained after the voltage is switched off.
  • FIG. 3 Another modification of the schematic relay structure is shown in FIG. 3.
  • the bearing point 8 corresponds to the bearing point 4 of FIG. 1, but the longitudinal force on the bearing point 8 must be directed in the opposite direction. As a result, the pretension of the contact spring in the end positions is achieved with a smaller overall length of the relay.
  • a practical embodiment of the relay of Fig. 1 is shown.
  • the bending transducer 1 is clamped in a housing 2 and coupled to a U-shaped leaf spring 13, the two spring legs 13a and 13b of which lie on both sides of the bending transducer 1 and can be switched over between corresponding counter-contact elements 5.
  • the contact spring 13 With the central part 13c, the contact spring 13 forms a bearing cutting edge 14 which is mounted in bearing notches 15 of a spring element 17.
  • the point of application 16 of the bending transducer 1 on the contact spring 13 is also designed as a cutting edge bearing, the contact spring 3 forming a bearing bracket 18.
  • the contact spring 13 instead of the spring element 17, the contact spring 13 could also be shaped in its area 13c in such a way that it itself exerts an axial force.
  • the bending transducer 1 is to be clamped firmly at its end 1a.
  • two fastening elements 12 can be formed on the housing, between which the bending transducer is glued.
  • the bearing point 16 could, for example, be designed according to FIG. 7.
  • the end 1 b of the bending transducer is provided with a metal coating 19, on which a bearing cutting edge 20 is formed.
  • This bearing cutting edge 20 in turn, lies in the bearing recess 18 formed on the contact spring 13.
  • the spring element 27 is slightly modified compared to the spring element 17 in the previous figures.
  • a plastic bearing element can also be molded or glued to the bending transducer.
  • the contact spring 13 shown in FIG. 4 can be used, for example, as a bridge contact element, so that it does not require its own power supply. But it can also be used as a spring for a (double) changeover contact and have its own power supply. Since an axial force acts on the bearing point 16, the current supply via the bearing is possible. However, if the bearing resistance is too high for the application, A flexible power supply can also be provided.
  • the contact spring legs 13a and 13b can also be electrically separated from one another and connected to one another in the bearing area via an insulating bearing element. With corresponding power supplies to the two spring '- no two switch contacts are thus obtained.

Landscapes

  • Contacts (AREA)
  • Thermally Actuated Switches (AREA)

Claims (10)

1. Relais piézoélectrique comportant un transducteur à flexion (1), qui est encastré unilatéralement et dont l'extrémité libre (1b) peut actionner au moins un élément de contact (3, 13), réalisé sous la forme d'une lame de ressort, qui est disposée approximativement parallèlement au transducteur a flexion (1) et est reliée a l'extrémité libre (1b) de ce transducteur, et dont l'extrémité libre (3b) est disposée en vis-à-vis d'au moins un élément de contact antagoniste (5), au voisinage de la zone (1a) d'encastrement du transducteur à flexion (1), et dans lequel le ressort en forme de lame (3 ; 13) peut pivoter autour d'un point de support (4 ; 4a ; 8 ; 14), qui est décale, dans sa direction longitudinale, sur une faible distance par rapport à sa longueur totale, par rapport au point d'attaque (6 ; 16) du transducteur à flexion (1), et dans lequel il est prévu un dispositif de basculement comportant un élément de ressort (7 ; 17 ; 25) agissant sur le ressort en forme de lame (3 ; 13) et tendant à faire pivoter le ressort en forme de lame (3 ; 13) a partir de la position parallèle au transducteur a flexion (1), caractérisé par le fait que l'élément de ressort (7 ; 17 ; 27) du dispositif de basculement agit directement sur le point de support (4, 4a ; 8 ; 14) du ressort en forme de lame (3 ; 13), dans la direction longitudinale de ce dernier.
2. Relais suivant la revendication 1, caractérisé par le fait que le point de support (4 ; 14) du ressort en forme de lame (3 ; 13) est disposé dans le plan de symétrie entre les deux positions d'extrémité du transducteur à flexion (1).
3. Relais suivant la revendication 1, caractérisé par le fait que le point de support (4a) du ressort en forme de lame est décalé par rapport au plan de symétrie entre les deux positions d'extrémité du transducteur a flexion (1).
4. Relais suivant l'une des revendications 1 à 3, caractérisé par le fait que le point de support (4 ; 14) est prévu sur l'extrémité (3a ; 13c), qui s'étend au-delà du point d'attaque (6 ; 16) du transducteur à flexion (1), du ressort en forme de lame (3, 13).
5. Relais suivant l'une des revendications 1 à 3, caractérisé par le fait que le point de support (8) pour le ressort en forme de lame (3) est prévu entre le point d'attaque (6) du transducteur à flexion et l'extrémité (3b), qui établit le contact, du ressort en forme de làme (3).
6. Relais suivant l'une des revendications 1 à 5, caractérisé par le fait qu'il est prévu, comme point de support (4 ; 14) pour le ressort en forme de lame (3 13), un support (15) à couteau coulissant, formé par l'élément de ressort (17 ; 27).
7. Relais suivant l'une des revendications 1 à 6, caractérisé par le fait que le point d'attaque (16) du transducteur à flexion sur le ressort en forme de lame (13) est réalisé sous la forme d'un support (18, 20) à couteau.
8. Relais suivant l'une des revendications 1 à 7, caractérisé par le fait que le ressort en forme de lame (13) comporte deux branches (13a, 13b) situées dans un plan et enserrant entre elles le transducteur à flexion (1).
9. Relais suivant l'une des revendications 1 à 7, caractérisé par le fait qu'il est prévu deux ressorts de contact, qui sont situés dans' un plan et enserrent entre eux le transducteur à flexion (1) et dont les extrémités de support sont reliées par une enveloppe réalisée en un matériau isolant.
10. Relais suivant les revendications 1 à 9; caractérisé par le fait qu'il est prévu un dispositif a aimant permanent, qui maintient de façon fixe le ressort en forme de lame dans sa position d'extrémité respective.
EP85109068A 1984-07-24 1985-07-19 Relais piézoélectrique Expired EP0170172B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3427266 1984-07-24
DE3427266 1984-07-24

Publications (2)

Publication Number Publication Date
EP0170172A1 EP0170172A1 (fr) 1986-02-05
EP0170172B1 true EP0170172B1 (fr) 1989-05-17

Family

ID=6241442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109068A Expired EP0170172B1 (fr) 1984-07-24 1985-07-19 Relais piézoélectrique

Country Status (2)

Country Link
EP (1) EP0170172B1 (fr)
DE (1) DE3570318D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6668892B2 (en) 1999-06-11 2003-12-30 3M Innovative Properties Company System for printing and applying tape onto surfaces

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5440194A (en) * 1994-05-13 1995-08-08 Beurrier; Henry R. Piezoelectric actuators
US6432528B1 (en) 1998-12-09 2002-08-13 3M Innovative Properties Company Variably printed tape and system for printing and applying tape onto surfaces
DE19904623C2 (de) * 1999-02-05 2001-05-31 Hengstler Gmbh Schalter, vorzugsweise Relais
US6652172B2 (en) 2001-01-05 2003-11-25 3M Innovative Properties Company Method and apparatus for handling linerless label tape within a printing device
US6884312B2 (en) 2002-04-12 2005-04-26 3M Innovative Properties Company Apparatus for printing and applying tape and methods of printing and applying tape
AT412365B (de) * 2002-06-18 2005-01-25 Hygrama Ag Ventil

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471967A (en) * 1946-05-03 1949-05-31 Bell Telephone Labor Inc Piezoelectric type switching relay
BE487170A (fr) * 1948-02-04
US2835761A (en) * 1953-05-25 1958-05-20 Electric Machinery Mfg Co Electrostrictive ceramic actuator
GB1108566A (en) * 1964-05-01 1968-04-03 Plessey Uk Ltd Improvements in electric relays
US4383195A (en) * 1980-10-24 1983-05-10 Piezo Electric Products, Inc. Piezoelectric snap actuator
US4458171A (en) * 1982-01-11 1984-07-03 Piezo Electric Products, Inc. Piezoelectric relay with tapered magnetic detent

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6668892B2 (en) 1999-06-11 2003-12-30 3M Innovative Properties Company System for printing and applying tape onto surfaces

Also Published As

Publication number Publication date
EP0170172A1 (fr) 1986-02-05
DE3570318D1 (en) 1989-06-22

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