EP0170172B1 - Relais piézoélectrique - Google Patents
Relais piézoélectrique Download PDFInfo
- 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
Links
- 238000005452 bending Methods 0.000 claims description 46
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
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)
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)
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)
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)
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 |
-
1985
- 1985-07-19 DE DE8585109068T patent/DE3570318D1/de not_active Expired
- 1985-07-19 EP EP85109068A patent/EP0170172B1/fr not_active Expired
Cited By (1)
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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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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