EP0170172A1 - Relais piézoélectrique - Google Patents

Relais piézoélectrique Download PDF

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Publication number
EP0170172A1
EP0170172A1 EP85109068A EP85109068A EP0170172A1 EP 0170172 A1 EP0170172 A1 EP 0170172A1 EP 85109068 A EP85109068 A EP 85109068A EP 85109068 A EP85109068 A EP 85109068A EP 0170172 A1 EP0170172 A1 EP 0170172A1
Authority
EP
European Patent Office
Prior art keywords
bending transducer
leaf spring
spring
point
bearing
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
EP85109068A
Other languages
German (de)
English (en)
Other versions
EP0170172B1 (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, via the free end of which at least one contact element can be actuated.
  • the object of the invention is to provide a piezoelectric relay in which the force-displacement characteristic that can be achieved with electromagnetic relays can be implemented in a simple and space-saving construction.
  • the contact element is designed as a leaf spring arranged approximately parallel to the bending transducer, which is connected to the free end of the bending transducer and with its free end in the area of the clamping point of the bending transducer is opposite at least one mating contact element that the leaf spring by a bearing point is pivotable, which is offset in its longitudinal direction by a small distance compared to its total length relative to the point of application of the bending transducer and that a tilting device is provided which strives to pull the leaf spring from the position parallel to the bending transducer.
  • the piezoelectric bending transducer has no contact current leads, no contact pieces or magnetic components. Its deflection is transmitted to a pivotable contact spring which is connected to the bending transducer only at one point of attack and otherwise carries out its switching movement in addition to the bending transducer.
  • 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.
  • a bistable or a monostable switching characteristic is achieved depending on whether the clamping point of the bending transducer and the bearing point of the contact leaf spring are rearranged symmetrically.
  • the additional tilting device prevents creeping contact.
  • this tilting device is formed by a spring element acting in the longitudinal direction on the leaf spring. This ensures that the contact spring can only remain in one of the end positions specified by the external contacts, even when the bending transducer is in a neutral position. With a corresponding design and arrangement of the spring element, the tilting characteristic of the leaf spring can be ensured.
  • a sliding-edge bearing formed by the spring element can already 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 can be switched between two mating contact elements 5 with its other end 3b.
  • the distance between the point of attack 6 of the bending transducer 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 are located on either side of the bending transducer 1 and can be switched over between corresponding mating 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 1b 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 is in turn in the bearing recess 18 formed on the contact spring 13.
  • the spring element 27 is against slightly modified over 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 supply lines to the two spring legs, two changeover contacts are thus obtained.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Contacts (AREA)
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 true EP0170172A1 (fr) 1986-02-05
EP0170172B1 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 (7)

* 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
WO2000034131A1 (fr) * 1998-12-09 2000-06-15 Minnesota Mining And Manufacturing Company Bande imprimee de maniere differente, systeme d'impression et d'application de la bande sur des surfaces
DE19904623A1 (de) * 1999-02-05 2000-11-23 Hengstler Gmbh Schalter, vorzugsweise Relais
US6415842B1 (en) 1999-06-11 2002-07-09 3M Innovative Properties Company System for printing and applying tape onto surfaces
US6652172B2 (en) 2001-01-05 2003-11-25 3M Innovative Properties Company Method and apparatus for handling linerless label tape within a printing device
AT412365B (de) * 2002-06-18 2005-01-25 Hygrama Ag Ventil
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH261495A (de) * 1948-02-04 1949-05-15 Immo Aktiengesellschaft Piezoelektrisches Relais.
US2471967A (en) * 1946-05-03 1949-05-31 Bell Telephone Labor Inc Piezoelectric type switching relay
US2835761A (en) * 1953-05-25 1958-05-20 Electric Machinery Mfg Co Electrostrictive ceramic actuator
US3292111A (en) * 1964-05-01 1966-12-13 Plessey Co Ltd Electrostrictive relay
US4383195A (en) * 1980-10-24 1983-05-10 Piezo Electric Products, Inc. Piezoelectric snap actuator
GB2113474A (en) * 1982-01-11 1983-08-03 Piezo Electric Prod Piezoelectric relay magnetic holding

Patent Citations (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
CH261495A (de) * 1948-02-04 1949-05-15 Immo Aktiengesellschaft Piezoelektrisches Relais.
US2835761A (en) * 1953-05-25 1958-05-20 Electric Machinery Mfg Co Electrostrictive ceramic actuator
US3292111A (en) * 1964-05-01 1966-12-13 Plessey Co Ltd Electrostrictive relay
US4383195A (en) * 1980-10-24 1983-05-10 Piezo Electric Products, Inc. Piezoelectric snap actuator
GB2113474A (en) * 1982-01-11 1983-08-03 Piezo Electric Prod Piezoelectric relay magnetic holding

Cited By (9)

* 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
WO2000034131A1 (fr) * 1998-12-09 2000-06-15 Minnesota Mining And Manufacturing Company Bande imprimee de maniere differente, systeme d'impression et d'application de la bande sur des surfaces
US6432528B1 (en) 1998-12-09 2002-08-13 3M Innovative Properties Company Variably printed tape and system for printing and applying tape onto surfaces
DE19904623A1 (de) * 1999-02-05 2000-11-23 Hengstler Gmbh Schalter, vorzugsweise Relais
DE19904623C2 (de) * 1999-02-05 2001-05-31 Hengstler Gmbh Schalter, vorzugsweise Relais
US6415842B1 (en) 1999-06-11 2002-07-09 3M Innovative Properties Company System for printing and applying tape onto surfaces
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

Also Published As

Publication number Publication date
EP0170172B1 (fr) 1989-05-17
DE3570318D1 (en) 1989-06-22

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