WO1982003723A1 - Electric contact,particularly for printed circuits of small electric appliances - Google Patents
Electric contact,particularly for printed circuits of small electric appliances Download PDFInfo
- Publication number
- WO1982003723A1 WO1982003723A1 PCT/DE1982/000082 DE8200082W WO8203723A1 WO 1982003723 A1 WO1982003723 A1 WO 1982003723A1 DE 8200082 W DE8200082 W DE 8200082W WO 8203723 A1 WO8203723 A1 WO 8203723A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- contact
- contact device
- circuit board
- grinder
- conductor track
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
- H05K3/245—Reinforcing conductive patterns made by printing techniques or by other techniques for applying conductive pastes, inks or powders; Reinforcing other conductive patterns by such techniques
- H05K3/247—Finish coating of conductors by using conductive pastes, inks or powders
- H05K3/249—Finish coating of conductors by using conductive pastes, inks or powders comprising carbon particles as main constituent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/12—Arrangements of current collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C10/00—Adjustable resistors
- H01C10/30—Adjustable resistors the contact sliding along resistive element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/60—Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
- H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
- H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
- H01H19/58—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch
- H01H19/585—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch provided with printed circuit contacts
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3452—Solder masks
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/20—Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
- H05K2201/2081—Compound repelling a metal, e.g. solder
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0703—Plating
- H05K2203/0723—Electroplating, e.g. finish plating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/12—Using specific substances
- H05K2203/127—Lubricants, e.g. during drilling of holes
Definitions
- Electrical contact device in particular for small electrical devices equipped with printed circuit boards.
- the invention relates to contact devices in electrical devices, in particular contact devices that interact with printed circuit boards of small electrical devices, such as clocks, cameras and electrical shavers.
- printed circuit boards for functional power supply in such small devices, which generally have their own power source.
- These printed circuit boards for example made of hard paper, preferably have copper tracks as current conductors, which are expanded at various points to form so-called solder eyes. These soldering eyes serve to receive the leads of electronic components, for example capacitors or transistors, or also the leads of contact devices interacting with the printed circuit board.
- the components By soldering the leads of electronic components to the conductor tracks of the circuit board, the components are electrically connected to the conductor tracks and mechanically to the circuit board. This is generally done with the aid of mechanical soldering processes, for example with the wave or the drag soldering process.
- resistance tracks with different resistance values can also be printed on such printed circuit boards.
- Such printed resistors the resistance value of which depends on the material used and the dimensions of the resistance track, can be applied, for example, with so-called resistance pastes using the screen printing process.
- the printed circuit board can also contain contact surfaces which are part of an electrical contact device and are gripped by a movable member of these contact devices, for example a spring plate or a contact grinder. These contact areas are usually gold-plated to prevent the conductivity of the contact surfaces from deteriorating due to corrosion and thus to ensure reliable contact for as long as possible.
- silver-plated, nickel-plated or tin-plated contact surfaces have also been used for this purpose.
- These circuit boards are quite complex to manufacture because the different layers have to be applied in several galvanic baths while covering the remaining circuit board area. Apart from that, the pure material value of precious metal layers is also considerable.
- the object of the invention is therefore to provide a contact device which does not have the deficiencies listed above, in particular not the need to cover the printed circuit board during the galvanizing and during the mechanical soldering process in the production of contact surfaces applied to printed circuit boards.
- Fig. 1 shows a cross section through a section of a circuit board, the pads and with uncoated graphite varnish wire delta sections, which are parts of the contact device according to the invention. 2 after the mechanical soldering process, the conductor tracks together with a contact grinder form a first contact device according to the invention,
- circuit board of FIG. 2 in which one of its conductor tracks together with a spring plate contact form a second contact device according to the invention and a third contact device according to the invention, consisting of two spring plates, which is mechanically firmly connected to the circuit board,
- Fig. 5 the same contact device in plan view.
- circuit board 1 shows a circuit board 1 of an electrical device, the plate body 1.1 of which is provided in a manner known per se with a plurality of conductors 2, 3, 4 and 5 consisting of copper tracks, which, as is known, have the task of making the different components relatively weak currents, in particular to supply tax flows.
- the copper tracks 2 and 3 shown in cross section are designed as soldering eyes and are therefore each provided with a central opening 2.1 and 3.1, which is aligned with a bore 1.11 and 1.12 of the plate body 1.1, which is made of hard paper, for example.
- These soldering eyes serve to firmly connect an electronic component, for example a diode 6 (FIG. 2) to the copper tracks 2 and 3.
- the two leads 6.1 and 6.2 of the diode 6 are inserted through the holes 1.11 and 1.12 of the plate body 1.1, so that their ends immerse in the solder eyes 2.1 and 3.1 of the copper tracks 2 and 3. Then these are electrically and mechanically connected to the copper wires by soldering.
- the leads 6.1 and 6.2 of the diode 6 which are soldered to the copper tracks 2 and 3 of the circuit board are shown in FIG , whereby all solder joints are made in one operation.
- the copper tracks 4 and 5 of the printed circuit board 1 shown in FIGS. 1 and 2 are not used for soldering to electronic components. Rather, they are provided here as contact surfaces of the electrical contact device according to the invention and must therefore not be subject to solder during the mechanical soldering process.
- the copper tracks 4 and 5 are therefore provided with a coating 7 and 9 made of graphite lacquer, for example with the graphite lacquer sold by Acheson Colloiden BV, Postbus 1, 9679 ZG Scheemda, Holland under the registered trademark "423SS", which needs a drying time of about 30 minutes at a temperature of around 80 ° Celsius.
- the sheathing of the copper tracks can be produced relatively easily, using screen printing processes known per se or else by spray coating processes and the use of a template.
- FIG. 2 schematically shows a contact grinder 8 of a contact device 14, the contact surface of which is also provided with a casing 8.1 made of graphite lacquer.
- This sheathing is even easier to manufacture than that of the conductor tracks, since in addition to the methods already mentioned, the immersion method can also be used.
- the contact grinder 8 can be moved in the directions indicated by a double arrow in FIG. 2 and can thus be in a first end position in which it is electrically connected to the conductor track 4 and in a second end position in which it is electrically connected to the conductor track 5 is connected. In this way, individual components or groups of components can be controlled or decoupled in the drive or control circuit of the electrical device.
- the graphite layers 7 and 9 have self-lubricating properties, which eliminates the need to periodically repeat greasing of the slideway when using metal-coated contact surfaces.
- the two exemplary embodiments (20, 25) of the contact device according to the invention shown in FIG. 3 are contact devices, the contacts of which are not closed in the illustrated rest position and are only closed by actuating a lever or the like.
- Such contact devices for example interacting with printed circuit boards of small electrical devices, can be found, inter alia, in battery-operated clocks with an electro-optical display, in which, for reasons of saving electricity, the time is only displayed when a key or the like is pressed.
- the contact device (20) shown at the top right in FIG. 3 essentially consists of a spring plate 21, which has a curved contact surface 22 provided with a coating 23 made of graphite lacquer, the conductor track section 4, its coating 7 and a schematically illustrated actuating lever 24.
- the spring plate 21 can for example be mechanically fixed to the housing of the small electrical device and electrically connected to its power supply.
- Both spring sheets are mechanically firmly connected to a holder 16, which can be made of plastic, for example, into which the spring sheets are cast.
- the holder 16 has two rigid supply lines 16.1 and 16.2, which are electrically connected to the spring plates 26 and 27 and are soldered in the solder eyes 2 and 3 of the circuit board.
- the holder 16 can have a nose, not shown here, which cooperates with a corresponding recess in the circuit board.
- the two contact surfaces 26.1 and 27.1 can be brought into contact with one another by depressing an actuating lever, which is not shown here, and a switching process can thus be triggered.
- FIGS. 4 and 5 A fourth exemplary embodiment of the contact device according to the invention is shown in FIGS. 4 and 5.
- contact surfaces of the contact device are in turn part of a printed circuit board which interacts with further contact surfaces of the contact device in such a way that a potentiometer which is partially integrated in a printed circuit board is produced.
- the solder-repellent and self-lubricating properties of sheaths consisting of graphite lacquer are of essential importance.
- the component of the potentiometer 10 integrated in the printed circuit board 1 consists of a so-called contradictional path 11, a conductor path 12 and an annular layer 12.1 of graphite lacquer.
- the conductor track 12 and the layer 12.1 can form a closed circular ring, while the resistance track 11 consists of a circular ring section.
- the movable part, ie the rotatable part of the potentiometer 10, consists here of a contact grinder 10.1.
- the conductor track 12 is provided with a casing 13 made of graphite lacquer and therefore solder-repellent, while the likewise solder-repellent resistance track 11 consists, for example, of a paste paste applied to the printed circuit board 1 using the screen printing method.
- the contact grinder 10.1 here consists of a single body made of electrically conductive material with great bending elasticity.
- a molded-on contact lug 10.11 which is provided with a coating 10.111 made of graphite varnish, slides on the resistance track 11 in a self-lubricating manner.
- a nose 10.14 is formed onto a shoulder 10.15 which engages under the printed circuit board body 1.1 and which belongs to a segment 10.16 which extends approximately at right angles to the printed circuit board level and penetrates a bearing bore 1.15 of the printed circuit board 1.
- the self-lubricating nose 10.14 sliding on the graphite lacquer layer 12.1 is dimensioned such that it cooperates with the restoring forces of the resilient contact grinder 10.1 for its axial securing and for a three-point support of the contact warts 10.11, 10.12 and 10.13 on the conductor track 12 or the resistance track 11 worries.
- the contact grinder 10.1 is advantageously formed from a suitably designed leaf spring made of a highly conductive material, for example brass. However, according to a further feature of the invention, it can also consist of an electrically conductive, thermoplastic with good spring properties and good abrasion resistance.
- adjusting slots 10.18 and 10.19 are formed on the grinder body, into which a key or a tool (for example a screwdriver) can be inserted both from the top and from the bottom of the circuit board.
- a key or a tool for example a screwdriver
- plug-in cutouts 10.20 which, with limited accessibility of the potentiometer, enable the contact grinder 10.1 to be rotated step by step by continuously moving a suitable key from cutout to cutout.
- the embodiments of the contact device according to the invention are not based on the exemplary embodiments described above limited, rather the sheathing of contact surfaces with inexpensive and easy-to-apply graphite lacquer can be used advantageously in many other electrical contact devices according to the invention due to its solder-repellent and self-lubricating properties.
- any other graphite varnish or another material can be used for sheathing the contact surfaces, provided that it is comparable in terms of electrical conductivity and corrosion resistance and has solder-repellent and self-lubricating properties.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The electric contact (14) is provided with a coating of conductor material, which is corrosion-resistant, weld-repellent and self-lubricating (7, 8.1, 9). The use of contacts of this type is particularly appropriate when the electric contact surfaces form the conductors of a printed circuit. The coating is preferably comprised by a graphite-based lacquer (7, 8.1, 9).
Description
Elektrische Kontaktvorrichtung, insbesondere für mit Leiterplatten ausgestattete elektrische Kleingeräte. Die Erfindung betrifft Kontaktvorrichtungen in elektrischen Geräten, insbesondere Kontaktvorrichtungen, die mit Leiterplatten von elektrischen Kleingeräten, wie zum Beispiel Uhren, Kameras und el ektrischen Rasierapparaten zusammenwirken. Electrical contact device, in particular for small electrical devices equipped with printed circuit boards. The invention relates to contact devices in electrical devices, in particular contact devices that interact with printed circuit boards of small electrical devices, such as clocks, cameras and electrical shavers.
Es ist bekannt, in derartigen, im allgemeinen mit eigener Stromquelle versehenen Kleingeräten, Leiterplatten für die funktionsgerechte Stromzuführung zu verwenden. Diese, beispielsweise aus Hartpapier bestehenden Leiterplatten besitzen vorzugsweise Kupferbahnen als Stromleiter, die an verschiedenen Stellen zu sogenannten Lötaugen erweitert sind. Diese Lötaugen dienen zur Aufnahme der Zuleitungen von elektronischen Bauteilen, beispielsweise Kondensatoren oder Transistoren oder auch der Zuleitungen von mit der Leiterplatte zusammenwirkenden Kontaktvorrichtungen.It is known to use printed circuit boards for functional power supply in such small devices, which generally have their own power source. These printed circuit boards, for example made of hard paper, preferably have copper tracks as current conductors, which are expanded at various points to form so-called solder eyes. These soldering eyes serve to receive the leads of electronic components, for example capacitors or transistors, or also the leads of contact devices interacting with the printed circuit board.
Durch das Verlöten der Zuleitungen von elektronischen Bauelementen mit den Leiterbahnen der Leiterplatte werden die Bauelemente mit den Leiterbahnen elektrisch und mit der Leiterplatte mechanisch verbunden. Dies geschieht im allgemeinen mit Hilfe von maschinellen Lötverfahren, beispielsweise mit dem Schwall- oder dem Schlepplötverfahren.By soldering the leads of electronic components to the conductor tracks of the circuit board, the components are electrically connected to the conductor tracks and mechanically to the circuit board. This is generally done with the aid of mechanical soldering processes, for example with the wave or the drag soldering process.
Auf solchen Leiterplatten können neben Leiterbahnen auch Widerstandsbahnen mit verschiedenem Widerstandswert aufgedruckt sein. Derartige aufgedruckte Widerstände, deren Widerstandswert vcm verwendeten Material und den Abmessungen der Widerstandsbahn abhängt, können zum Beispiel mit sogenannten Widerstandspasten im Siebdruckverfahren aufgebracht werden.In addition to conductor tracks, resistance tracks with different resistance values can also be printed on such printed circuit boards. Such printed resistors, the resistance value of which depends on the material used and the dimensions of the resistance track, can be applied, for example, with so-called resistance pastes using the screen printing process.
Die Leiterplatte kann auch Kontaktflächen enthalten, die Teil einer elektrischen Kontaktvorrichtung sind und von einem beweglichen Glied dieser Kontaktvorrichtungen, beispielsweise einen Federblech oder einem Kontaktschleifer abαeαriffen werden. Diese Kontaktflächen sind
in der Regel vergoldet, um eine Verschlechterung der Leitfähigkeit der Kontaktflächen durch Korrosion zu verhindern und damit eine sichere Kontaktgabe über einen möglichst langen Zeitraum zu gewährleisten. Es sind hierzu jedoch auch schon versilberte, vernickelte oder verzinnte Kontaktflächen eingesetzt worden. Diese Leiterplatten sind recht aufwendig herzustellen, weil die verschiedenen Schichten in mehreren galvanischen Bädern unter Abdeckung der restlichen Leiterplattenfläche aufgebracht werden müssen. Abgesehen davon, ist auch der reine Materialwert von Edelmetallschichten beträchtlich.The printed circuit board can also contain contact surfaces which are part of an electrical contact device and are gripped by a movable member of these contact devices, for example a spring plate or a contact grinder. These contact areas are usually gold-plated to prevent the conductivity of the contact surfaces from deteriorating due to corrosion and thus to ensure reliable contact for as long as possible. However, silver-plated, nickel-plated or tin-plated contact surfaces have also been used for this purpose. These circuit boards are quite complex to manufacture because the different layers have to be applied in several galvanic baths while covering the remaining circuit board area. Apart from that, the pure material value of precious metal layers is also considerable.
Ebenso ist es bei solchen Leiterplatten erforderlich, die mit anderen Teilen der Kontaktvorrichtung zusammenwirkenden Kontaktflächen während des maschinellen Lötvorganges der Leiterplatte durch geeignete Mittel vollständig abzudecken, um ein Verschmutzen der Kontaktflächen durch anhaftendes Lot aus dem Lötband zu verhindern. Alle diese Verfahrensschritte machen die Herstellung einer Leiterplatte, die sowohl Lötaugen zur Aufnahme elektronischer Bauteil, als auch einer Kontaktvorrichtung zugehörige Kontaktflächen aufweist, sehr kostspielig.It is also necessary with such printed circuit boards that the contact surfaces interacting with other parts of the contact device be completely covered by suitable means during the mechanical soldering process of the printed circuit board in order to prevent the contact surfaces from becoming dirty by adhering solder from the soldering tape. All of these process steps make the production of a printed circuit board that has both soldering eyes for receiving electronic components and contact surfaces associated with a contact device very expensive.
Ein weiterer Nachteil der bekannten Kontaktvorrichtungen, die auf Leiterplatten angebrachte Kontaktflächen aufweisen, besteht darin, daß wiederum zur Vermeidung von Korrosion, auch die übrigen Kontaktflächen der Kontaktvorrichtung, die nicht auf Leiterbahnen angebracht sind, mit leitfähigen und korrosionsbeständigen Ummantelungen versehen werden müssen. Das Aufbringen dieser Ummantelungen kann auch wieder in galvanischen Bädern erfolgen, wobei wiederum die bereits vorstehend genannten Metalle Verwendung finden.Another disadvantage of the known contact devices which have contact surfaces attached to printed circuit boards is that, in order to avoid corrosion, the other contact surfaces of the contact device which are not attached to conductor tracks must also be provided with conductive and corrosion-resistant coatings. These coatings can also be applied again in galvanic baths, again using the metals already mentioned above.
Grunsätzlich sind somit bei den bekannten Kontaktvorrichtungen, unabhängig davon, ob sie auf Leiterplatten aufgebrachte Kontaktflächen enthalten oder nicht, alle Kontaktflächen mit korrosionsbeständigen Ummantelungen zu versehen. Dies gilt beispielsweise Tür Federblech
Kontaktvorrichtungen, die keine auf Leiterbahnen aufgebrachte Kontaktflächen besitzen, aber durch Verlöten ihrer Anschlüsse mit der Leiterplatte mit letzterer noch elektrisch und mechanisch verbunden sind und ebenso für Kontaktvorrichtungen, die weder elektrisch noch mechanisch mit einer Leiterplatte verbunden sind.In principle, in the known contact devices, regardless of whether or not they contain contact areas applied to printed circuit boards, all contact areas are to be provided with corrosion-resistant coatings. This applies, for example, door spring plate Contact devices that have no contact surfaces applied to conductor tracks, but are still electrically and mechanically connected to the circuit board by soldering their connections to the circuit board, and likewise for contact devices that are neither electrically nor mechanically connected to a circuit board.
Weiterer gemeinsamer Nachteil aller bekannten Kontaktvorrichtungen, deren Kor.taktflächen sich berühren und dabei gegeneinander verschoben werden, ist die Notwendigkeit, metallbeschichtete Kontaktflächen nachzufetten, da es sonst aufgrund von Korrosionserscheinungen zu Betriebsstörungen kommen kann, die einen vollständigen Ersatz der Kontaktvorrichtung nötig machen.Another common disadvantage of all known contact devices, the contact surfaces of which contact one another and are thereby displaced relative to one another, is the need to relubricate metal-coated contact surfaces, since otherwise corrosion phenomena can lead to malfunctions which necessitate a complete replacement of the contact device.
Aufgabe der Erfindung ist es daher, eine Kontaktvorrichtung anzugeben, welche die vorstehend aufgeführten Mängel nicht aufweist, insbesondere nicht die Notwendigkeit des Abdeckens der Leiterplatte während der Galvanisierung und während des maschinellen Lötvorgangs bei der Herstellung von auf Leiterplatten aufgebrachten Kontakt-flächen.The object of the invention is therefore to provide a contact device which does not have the deficiencies listed above, in particular not the need to cover the printed circuit board during the galvanizing and during the mechanical soldering process in the production of contact surfaces applied to printed circuit boards.
Gelöst wird diese Aufgabe für die im Oberbegriff des Patentanspruchs 1 definierte Kontaktvorrichtung gemäß der Erfindung dadurch, daß deren Kontaktflächen mit einer leitfähigen, korrosionsbeständigen, lotabweisenden und selbstschmierenden Ummantelung versehen sind.This object is achieved for the contact device according to the invention defined in the preamble of claim 1 in that the contact surfaces thereof are provided with a conductive, corrosion-resistant, solder-repellent and self-lubricating sheathing.
Vorteilhafte Weiterbildungen des Erfindungsgegenstands finden sich in den Unteransprüchen.Advantageous developments of the subject matter of the invention can be found in the subclaims.
Der Gegenstand der Erfindung wird nachstehend anhand der Zeichnungen beispielsweise näher erläutert. Es zeigen:The object of the invention is explained in more detail below with reference to the drawings, for example. Show it:
Fig. 1 einen Querschnitt durch einen Ausschnitt aus einer Leiterplatte, die Lötaugen und mit Graphitlack unrnantelte Leiterδahnabschnitte aufweist, die Teile der erfindungsgemäßen Kontaktvorrichtung sind.
Fig. 2 die Leiterplatte der Fig. 1 nach dem maschinellen Lötvorgang, deren Leiterbahnen zusammen mit einem Kontaktschleifer eine erste erfindungsgemäße Kontaktvorrichtung bilden,Fig. 1 shows a cross section through a section of a circuit board, the pads and with uncoated graphite varnish wire delta sections, which are parts of the contact device according to the invention. 2 after the mechanical soldering process, the conductor tracks together with a contact grinder form a first contact device according to the invention,
Fig. 3 die Leiterplatte der Fig. 2, bei der eine ihrer Leiterbahnen zusammen mit einem Federblechkontakt eine zweite erfindungsgemäße Kontaktvorrichtung bilden und eine dritte erfindungsgemäße, aus zwei Federblechen bestehende Kontaktvorrichtung, die mit der Leiterplatte mechanisch fest verbunden ist,3, the circuit board of FIG. 2, in which one of its conductor tracks together with a spring plate contact form a second contact device according to the invention and a third contact device according to the invention, consisting of two spring plates, which is mechanically firmly connected to the circuit board,
Fig. 4 eine als Teil eines Potentiometers ausgeb.ildete Kontaktvorrichtung gemäß der Erfindung,4 shows a contact device designed as part of a potentiometer according to the invention,
Fig. 5 diesselbe Kontaktvorrichtung in Draufsicht.Fig. 5 the same contact device in plan view.
Die Fig. 1 läßt eine Leiterplatte 1 eines elektrischen Gerätes erkennen, deren Plattenkörper 1.1 in an sich bekannter Weise mit mehreren aus Kupferbahnen bestehenden Leitern 2, 3, 4 und 5 versehen ist, die bekanntlich die Aufgabe haben, den unterschiedlichen Bauelementen relativ schwache Ströme, insbesondere Steuerströme zuzuleiten.1 shows a circuit board 1 of an electrical device, the plate body 1.1 of which is provided in a manner known per se with a plurality of conductors 2, 3, 4 and 5 consisting of copper tracks, which, as is known, have the task of making the different components relatively weak currents, in particular to supply tax flows.
Hierbei sind die im Querschnitt dargestellten Kupferbahnen 2 und 3 als Lötaugen ausgebildet und deshalb jeweils mit einer zentrischen öffnung 2.1 und 3.1 versehen, die mit je einer Bohrung 1.11 und 1.12 des beispielsweise aus Hartpapier bestehenden Plattenkörpers 1.1 fluchtet. Diese Lötaugen dienen zum festen Verbinden eines elektronischen Bauteils, beispielsweise einer Diode 6 (Fig. 2) mit den Kupferbahnen 2 und 3. Zu diesem Zweck werden die beiden Zuleitungen 6.1 und 6.2 der Diode 6 durch die Bohrungen 1.11 und 1.12 des Plattenkörpers 1.1 hindurchgesteckt, so daß ihre Enden in die Lötaugen 2.1 und 3.1 der Kupferbahnen 2 und 3 eintauchen. Sodann werden diese durch Verlöten mit den Kupfer!eitern elektrisch und mechanisch verbunden.
Die mit den Kupferbahnen 2 und 3 der Leiterplatte verlöteten Zuleitungen 6.1 und 6.2 der Diode 6 zeigt die Figur 2. Das Verlöten geschieht hier im allgemeinen maschinell, beispielsweise nach dem Schlepplötverfahren, bei dem die gesamte Oberseite der Leiterplatte mit dem flüssigen Lötmittel in Berührung gebracht wird, wobei sämtliche Lötstellen in einem Arbeitsgang hergestellt werden.Here, the copper tracks 2 and 3 shown in cross section are designed as soldering eyes and are therefore each provided with a central opening 2.1 and 3.1, which is aligned with a bore 1.11 and 1.12 of the plate body 1.1, which is made of hard paper, for example. These soldering eyes serve to firmly connect an electronic component, for example a diode 6 (FIG. 2) to the copper tracks 2 and 3. For this purpose, the two leads 6.1 and 6.2 of the diode 6 are inserted through the holes 1.11 and 1.12 of the plate body 1.1, so that their ends immerse in the solder eyes 2.1 and 3.1 of the copper tracks 2 and 3. Then these are electrically and mechanically connected to the copper wires by soldering. The leads 6.1 and 6.2 of the diode 6 which are soldered to the copper tracks 2 and 3 of the circuit board are shown in FIG , whereby all solder joints are made in one operation.
Die Kupferbahnen 4 und 5 der in den Figuren 1 und 2 dargestellten Leiterplatte 1 dienen dagegen nicht dem Verlöten mit elektronischen Bauteilen. Sie sind hier vielmehr als Kontaktflächen der erfindungsgemäßen elektrischen Kontaktvorrichtung vorgesehen und dürfen somit, während des maschinellen Lötvorgangs, nicht mit Lot behaftet werden.In contrast, the copper tracks 4 and 5 of the printed circuit board 1 shown in FIGS. 1 and 2 are not used for soldering to electronic components. Rather, they are provided here as contact surfaces of the electrical contact device according to the invention and must therefore not be subject to solder during the mechanical soldering process.
Gemäß vorliegender Erfindung sind deshalb die Kupferbahnen 4 bzw. 5 mit einer Ummantelung 7 bzw. 9 aus Graphitlack versehen, beispielsweise mit dem von der Firma Acheson Colloiden B.V., Postbus 1, 9679 ZG Scheemda, Holland unter dem eingetragenen Warenzeichen "423SS" vertriebenen Graphitlack, der bei einer Temperatur von etwa 80° Celsius eine Trocknungszeit von etwa 3o Minuten benötigt.According to the present invention, the copper tracks 4 and 5 are therefore provided with a coating 7 and 9 made of graphite lacquer, for example with the graphite lacquer sold by Acheson Colloiden BV, Postbus 1, 9679 ZG Scheemda, Holland under the registered trademark "423SS", which needs a drying time of about 30 minutes at a temperature of around 80 ° Celsius.
Ein vollständiger Schutz der Kupferbahnen 4 und 5 vor anhaftendem Lot wird zuverlässig erreicht, wenn die Ummantelungen 7 und 9 auch die 'Seitenwände der Kupferbahnen 4 und 5 vollständig umgibt. Die Ummantelung der Kupferbahnen läßt sich, durch an sich bekannte Siebdruckverfahren oder auch durch Lackspritzverfahren und der Verwendung einer Schablone, relativ einfach herstellen.Complete protection of the copper tracks 4 and 5 from adhering solder is reliably achieved if the sheaths 7 and 9 also completely surround the side walls of the copper tracks 4 and 5. The sheathing of the copper tracks can be produced relatively easily, using screen printing processes known per se or else by spray coating processes and the use of a template.
Die Fig. 2 zeigt schematisch einen Kontaktschleifer 8 einer Kontaktvorrichtung 14, dessen Kontaktfläche ebenfalls mit einer Ummantelung 8.1 aus Graphitlack versehen ist. Diese Ummantelung ist noch einfacher herzustellen, als die der Leiterbahnen, da neben den bereits genannten Verfahren beispielsweise auch die Tauch!ackierMethode angewendet werden kann.
Der Kontaktschleifer 8 kann in den in der Fig. 2 durch einen Doppelpfeil gekennzeichneten Richtungen bewegt werden und kann so in eine erste Endlage, bei der er elektrisch mit der Leiterbahn 4 verbunden ist und in eine zweite Endlage, bei der er mit der Leiterbahn 5 elektrisch verbunden ist gelangen. Auf diese Weise können im Antriebsoder Steuerstromkreis des elektrischen Gerätes einzelne Bauelemente oder Gruppen von Bauelementen angesteuert oder abgekoppelt werden.2 schematically shows a contact grinder 8 of a contact device 14, the contact surface of which is also provided with a casing 8.1 made of graphite lacquer. This sheathing is even easier to manufacture than that of the conductor tracks, since in addition to the methods already mentioned, the immersion method can also be used. The contact grinder 8 can be moved in the directions indicated by a double arrow in FIG. 2 and can thus be in a first end position in which it is electrically connected to the conductor track 4 and in a second end position in which it is electrically connected to the conductor track 5 is connected. In this way, individual components or groups of components can be controlled or decoupled in the drive or control circuit of the electrical device.
Die Graphitschichten 7 und.9 besitzen selbstschmierende Eigenschaften, womit sich das bei Verwendung von metällbeschichteten Kontaktflächen erforderliche, periodisch zu wiederholende Einfetten der Gleitbahn erübrigt.The graphite layers 7 and 9 have self-lubricating properties, which eliminates the need to periodically repeat greasing of the slideway when using metal-coated contact surfaces.
Bei den beiden in Fig. 3 dargestellten Ausführungsbeispielen (20, 25) der erfindungsgeraäßen Kontaktvorrichtung handelt es sich um Kontaktvorrichtungen, deren Kontakte in der .abgebildeten Ruhelage nicht geschlossen sind und erst durch Betätigen eines Hebels oder dergleichen geschlossen werden. Solche zum Beispiel mit Leiterplatten von elektrischen Kleingeräten zusammenwirkende Kontaktvorrichtungen findet man unter anderem bei batteriebetriebenen Uhren mit elektro-optischer Anzeige, bei denen aus Gründen der Stromersparnis die Uhrzeit nur bei Betätigen einer Taste oder dergleichen angezeigt wird.The two exemplary embodiments (20, 25) of the contact device according to the invention shown in FIG. 3 are contact devices, the contacts of which are not closed in the illustrated rest position and are only closed by actuating a lever or the like. Such contact devices, for example interacting with printed circuit boards of small electrical devices, can be found, inter alia, in battery-operated clocks with an electro-optical display, in which, for reasons of saving electricity, the time is only displayed when a key or the like is pressed.
Die rechts oben in der Fig. 3 dargestellte Kontaktvorrichtung (20) besteht im wesentlichen aus einem Federblech 21, welches eine gewölbte, mit einer Ummantelung 23 aus Graphitlack versehene Kontaktfläche 22 aufweist, dem Leiterbahnabschnitt 4, dessen Ummantelung 7 und einem schematisch dargestellten Betätigungshebel 24. Das Federblech 21 kann beispielsweise mechanisch fest mit dem Gehäuse des elektrischen Kleingeräts und elektrisch mit dessen Stromversorgung verbunden sein. Der Betätigungshebel 24, bei dessen Niederdrücken die mit einer Ummantelung 7 versehene Leiterbahn 4 dann mit der Stromversorgung verbunden ist, kann in einer hier nicht gezeichneten Ausnehmung des Gehäuses geführt und mit einer Drucktaste versehen sein.
Die links unten in der Fig. 3 dargestellte Kontaktvorrichtung 25 weist zwei Federbleche 26 und 27 auf, deren Kontaktflächen 26.1 und 27.1 mit einer Ummantelung (26.2,27.2) aus Graphitlack überzogen sind. Beide Federbleche sind mit einer Halterung 16 mechanisch fest verbunden, die beispielsweise aus Kunststoff bestehen kann, in den die Federbleche eingegossen sind. Die Halterung 16 weist zwei starre Zuleitungen 16.1 bzw. 16.2 auf, die mit den Federblechen 26 bzw. 27 elektrisch verbunden und in den Lötaugen 2 bzw. 3 der Leiterplatte verlötet sind. Zur weiteren Stabilisierung der mechanischen Verbindung zwischen der Leiterplatte und den beiden Federblechen 26 und 27 kann die Halterung 16 eine hier nicht gezeichnete Nase aufweisen, die mit einer entsprechenden Ausnehmung in der Leiterplatte zusammenwirkt. Auch bei der Kontaktvorrichtung 25 können, durch Niederdrücken eines hier nicht dargestellten Betätigungshebels die beiden Kontaktflächen 26.1 und 27.1 miteinander in Berührung gebracht und damit ein Schaltvorgang ausgelöst werden.The contact device (20) shown at the top right in FIG. 3 essentially consists of a spring plate 21, which has a curved contact surface 22 provided with a coating 23 made of graphite lacquer, the conductor track section 4, its coating 7 and a schematically illustrated actuating lever 24. The spring plate 21 can for example be mechanically fixed to the housing of the small electrical device and electrically connected to its power supply. The actuating lever 24, when depressed, the conductor track 4 provided with a casing 7 is then connected to the power supply, can be guided in a recess of the housing (not shown here) and can be provided with a push button. The contact device 25 shown at the bottom left in FIG. 3 has two spring plates 26 and 27, the contact surfaces 26.1 and 27.1 of which are covered with a coating (26.2, 27.2) made of graphite lacquer. Both spring sheets are mechanically firmly connected to a holder 16, which can be made of plastic, for example, into which the spring sheets are cast. The holder 16 has two rigid supply lines 16.1 and 16.2, which are electrically connected to the spring plates 26 and 27 and are soldered in the solder eyes 2 and 3 of the circuit board. To further stabilize the mechanical connection between the circuit board and the two spring plates 26 and 27, the holder 16 can have a nose, not shown here, which cooperates with a corresponding recess in the circuit board. In the case of the contact device 25 as well, the two contact surfaces 26.1 and 27.1 can be brought into contact with one another by depressing an actuating lever, which is not shown here, and a switching process can thus be triggered.
Die links unten in der Fig. 3 abgebildete erf-indungsgemäße Kontaktvorrichtung, die keine in eine Leiterplatte integrierte Kontaktfläche mehr aufweist, braucht auch mechanisch nicht mit derselben verbunden sein, sondern kann an beliebiger Stelle des elektrischen Geräts angebracht sein.The contact device according to the invention shown at the bottom left in FIG. 3, which no longer has a contact surface integrated into a printed circuit board, does not need to be mechanically connected to the same, but can be attached at any point on the electrical device.
Ein viertes Ausführungsbeispiel der erfindungsgemäßen Kontaktvorrichtung ist in den Figuren 4 und 5 dargestellt. Bei diesem Ausfuhrungsbeispiel sind wiederum Kontaktflächen der Kontaktvorrichtung Bestandteil einer Leiterplatte, die mit weiteren Kontaktflächen der Kontaktvorrichtung so zusammenwirkt, daß ein teilweise in eine Leiterplatte integriertes Potentiometer entsteht. Auch bei diesem Ausführungsbeispiel sind die lotabweisenden und selbstschmierenden Eigenschaften von aus Graphitlack bestehenden Ummantelungen von wesentlicher Bedeutung.
Wie die Figur 4 erkennen läßt, besteht der in die Leiterplatte 1 integrierte Bestandteil des Potentiometers 10 aus einer sogenannten Widers tandsbahn 11, einer Leiterbahn 12 und einer kreisringförmigen Schicht 12.1 aus Graphitlack. Die Leiterbahn 12 und die Schicht 12.1 können einen geschlossenen Kreisring bilden, während die Widerstands bahn 11 aus einem Kreisring-Ausschnitt besteht. Der bewegl iche, also der drehbare Teil des Potentiometers 10 besteht hier aus einem Kontaktschleifer 10.1.A fourth exemplary embodiment of the contact device according to the invention is shown in FIGS. 4 and 5. In this exemplary embodiment, contact surfaces of the contact device are in turn part of a printed circuit board which interacts with further contact surfaces of the contact device in such a way that a potentiometer which is partially integrated in a printed circuit board is produced. In this exemplary embodiment, too, the solder-repellent and self-lubricating properties of sheaths consisting of graphite lacquer are of essential importance. As can be seen in FIG. 4, the component of the potentiometer 10 integrated in the printed circuit board 1 consists of a so-called contradictional path 11, a conductor path 12 and an annular layer 12.1 of graphite lacquer. The conductor track 12 and the layer 12.1 can form a closed circular ring, while the resistance track 11 consists of a circular ring section. The movable part, ie the rotatable part of the potentiometer 10, consists here of a contact grinder 10.1.
Die Leiterbahn 12 ist mit einer Ummantelung 13 aus Graphitlack versehen und daher lotabweisend , während die ebenfalls lotabweisende Widerstandsbahn 11 zum Beispiel aus einer im Siebdruckverfahren auf die Leiterplatte 1 aufgebrachten Widers tandspaste besteht. Der Kontaktschl eifer 10.1 besteht hier aus einem einzigen Körper aus el ektrisch leitendem Material mit großer Biegeelastizität. Eine ihm angeformte Kontaktwarze 10.11, die mit einer Ummantelung 10.111 aus Graphitlack versehen ist, gleitet selbstschmierend auf der Widerstandsbahn 11. Zwei weitere ebenfalls dem Kontaktschleifer 10.1 angeformte Kontaktwarzen 10.12 bzw. 10.13 gleiten selbstschmierend auf der Ummantel ung 13 der Leiterbahn 12 und weisen selbst auch Ummantel ungen 10.121 und 10.131 aus Graphitlack auf (in der Fi gur 4 ist nur die Ummantelung 10.121 sichtbar) .The conductor track 12 is provided with a casing 13 made of graphite lacquer and therefore solder-repellent, while the likewise solder-repellent resistance track 11 consists, for example, of a paste paste applied to the printed circuit board 1 using the screen printing method. The contact grinder 10.1 here consists of a single body made of electrically conductive material with great bending elasticity. A molded-on contact lug 10.11, which is provided with a coating 10.111 made of graphite varnish, slides on the resistance track 11 in a self-lubricating manner. Two further contact lugs 10.12 and 10.13, also formed on the contact grinder 10.1, slide in a self-lubricating manner on the coating 13 of the conductor track 12 and also have a coating themselves 10.121 and 10.131 made of graphite lacquer (only the casing 10.121 is visible in FIG. 4).
Einer den Leiterplattenkörper 1.1 untergreifenden Schulter 10.15, die einem etwa rechtwinklig zur Leiterplattenebene sich erstreckenden, eine Lagerbohrung 1.15 der Leiterplatte 1 durchdringenden Segment 10.16 zugehört, ist eine Nase 10.14 angeformt. Ein weiteres etwa rechtwinklig zur Schleiferebene sich erstreckendes Segment 10.17 des Kontaktschleifers 10 liegt an dem (gemäß Fig. 3) linken Wandungsabschnitt 1.152 der Lagerbohrung 1.15 der Leiterplatte 1 an. Beide Segmente 10.16 bzw. 10.17 bilden im Zusammenwirken mit dem rechten bzw. linken Wandungsabschnitt 1.151 bzw. 1.152 der Lagerbohrung 1.15
somit eine ausreichende Lagerung des Kontaktschleifers 10.1 innerhalb der Lagerbohrung 1.15. Die auf der Graphitlack-Schicht 12.1 selbstschmierend gleitende Nase 10.14 ist so bemessen, daß sie im Zusammenwirken mit den Rückstellkräften des federnden KontaktSchleifers 10.1 für dessen axiale Sicherung und für eine Dreipunktauflage der Kontaktwarzen 10.11, 10.12 und 10.13 auf der Leiterbahn 12 bzw. der Widerstandsbahn 11 sorgt. Der Kontaktschleifer 10.1 ist vorteilhaft aus einer entsprechend gestalteten Blattfeder aus gut leitendem Material, beispielsweise Messing gebildet. Er kann jedoch nach einem weiteren Merkmal der Erfindung ebenso aus elektrisch leitfähigem, thermoplastischen Kunststoff mit guten Federeigenschaften und guter Abriebfestigkeit bestehen.A nose 10.14 is formed onto a shoulder 10.15 which engages under the printed circuit board body 1.1 and which belongs to a segment 10.16 which extends approximately at right angles to the printed circuit board level and penetrates a bearing bore 1.15 of the printed circuit board 1. Another segment 10.17 of the contact grinder 10, which extends approximately at right angles to the grinder plane, lies against the left-hand wall section 1.152 of the bearing bore 1.15 of the printed circuit board 1 (according to FIG. 3). In cooperation with the right and left wall sections 1.151 and 1.152, both segments 10.16 and 10.17 form the bearing bore 1.15 sufficient contact grinding 10.1 within the bearing bore 1.15. The self-lubricating nose 10.14 sliding on the graphite lacquer layer 12.1 is dimensioned such that it cooperates with the restoring forces of the resilient contact grinder 10.1 for its axial securing and for a three-point support of the contact warts 10.11, 10.12 and 10.13 on the conductor track 12 or the resistance track 11 worries. The contact grinder 10.1 is advantageously formed from a suitably designed leaf spring made of a highly conductive material, for example brass. However, according to a further feature of the invention, it can also consist of an electrically conductive, thermoplastic with good spring properties and good abrasion resistance.
Zum Verdrehen des Kontaktschleifers 10.1 gegenüber der Leiterplatte 1 sind dem Schleiferkörper Stellschlitze 10.18 und 10.19 angeformt, in die ein Schlüssel oder ein Werkzeug (beispielsweise Schraubenzieher) sowohl von der Oberseite als auch von der Unterseite der Leiterplatte eingeführt werden kann. Dem. gleichen Zweck dienen am Umfang des Kontaktschleifers 10.1 vorgesehene Steckausschnitte 10.20, die bei beschränkter Zugänglichkeit des Potentiometers das schrittweise Verdrehen des Kontaktschleifers 10.1 durch stetiges Umsetzen eines geeigneten Schlüssels von Ausschnitt zu Ausschnitt ermöglichen.To rotate the contact grinder 10.1 relative to the circuit board 1, adjusting slots 10.18 and 10.19 are formed on the grinder body, into which a key or a tool (for example a screwdriver) can be inserted both from the top and from the bottom of the circuit board. The . The same purpose is provided on the periphery of the contact grinder 10.1, plug-in cutouts 10.20, which, with limited accessibility of the potentiometer, enable the contact grinder 10.1 to be rotated step by step by continuously moving a suitable key from cutout to cutout.
In den Figuren 4 und 5 sind die drei, bei Potentiometern üblichen elektrischen Anschlüsse, nämlich ein Anschluß an einem Ende und ein Anschluß am anderen Ende der Widerstandsbahn 11, zwischen denen der gesamte Widerstand der Widerstandsbahn 11 anliegt und ein Anschluß an der Leiterbahn 12 zum Abgriff des von der Stellung des Kontaktschleifers abhängigen Widerstands nicht eingezeichnet,In FIGS. 4 and 5, the three electrical connections that are common with potentiometers, namely a connection at one end and a connection at the other end of the resistance track 11, between which the entire resistance of the resistance track 11 is applied and a connection on the conductor track 12 for tapping the resistance dependent on the position of the contact grinder is not shown,
Die Ausführungsformen der erfindungsgernäßen Kontaktvorrichtung sind nicht auf die vorstehend beschriebenen Ausführungsbeispiele
beschränkt, vielmehr kann die Ummantelung von Kontaktflächen mit preiswertem und einfach aufzubringendem Graphitlack aufgrund seiner lotabweisenden und selbstschmierenden Eigenschaften in vielen weiteren erfindungsgemäßen elektrischen Kontaktvorrichtungen vorteilhaft angewendet werden. Ebenso kann anstelle des genannten Graphitlacks der Firma Acheson jeder andere Graphitlack oder ein anderes Material für die Ummantelung der Kontaktflächen verwendet werden, sofern er hinsichtlich elektrischer Leitfähigkeit und Korrosionsbeständigkeit vergleichbar ist und lotabweisende und selbstschmierende Eigenschaften aufweist.
The embodiments of the contact device according to the invention are not based on the exemplary embodiments described above limited, rather the sheathing of contact surfaces with inexpensive and easy-to-apply graphite lacquer can be used advantageously in many other electrical contact devices according to the invention due to its solder-repellent and self-lubricating properties. Likewise, instead of the above-mentioned graphite varnish from Acheson, any other graphite varnish or another material can be used for sheathing the contact surfaces, provided that it is comparable in terms of electrical conductivity and corrosion resistance and has solder-repellent and self-lubricating properties.
Claims
1. Kontaktvorrichtung, deren miteinander in elektrisch leitende Verbindung bringbare Kontaktflächen mit einer leitfähigen und korosionsbeständigen Auflage bzw. Ummantelung versehen sind, dadurch gekennzeichnet, daß die Ummantelung (7, 8.1, 9, 10.111, 10.121, 23, 26.2, 27.2) der Kontaktflächen (4, 5, 8, 10.11, 10.12, 10.13, 12, 22, 26.1, 27.1) lotabweisende und selbstschmierende Eigenschaften aufweist.1. Contact device, the contact surfaces which can be brought into electrically conductive connection with one another are provided with a conductive and corrosion-resistant support or sheathing, characterized in that the sheathing (7, 8.1, 9, 10.111, 10.121, 23, 26.2, 27.2) of the contact surfaces ( 4, 5, 8, 10.11, 10.12, 10.13, 12, 22, 26.1, 27.1) has solder-repellent and self-lubricating properties.
2. Kontaktvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Ummantelung der Kontaktflächen aus Graphitlack besteht.2. Contact device according to claim 1, characterized in that the sheathing of the contact surfaces consists of graphite lacquer.
3. Kontaktvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei Ausführung als Tastschalter (25) die Kontaktvorrichtung zwei in einer Halterung (16) befestigte Federbleche (26, 27) enthält, deren ummantelte Kontaktflächen (26.1, 27.1) einander zugekehrt sind und deren Zuleitungen (16.1, 16.2) mit Leiterbahnen einer Leiterplatte (1) verlötet sind.3. Contact device according to claim 1 or 2, characterized in that when executed as a push button (25), the contact device contains two spring plates (26, 27) fastened in a holder (16), the coated contact surfaces (26.1, 27.1) of which face each other and whose leads (16.1, 16.2) are soldered to the conductor tracks of a circuit board (1).
4. Kontaktvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß mindestens eine Kontaktfläche der Kontaktvorrichtung aus einem Abschnitt einer Leiterbahn (4) einer Leiterplatte (1) besteht.4. Contact device according to claim 1 or 2, characterized in that at least one contact surface of the contact device consists of a portion of a conductor track (4) of a circuit board (1).
5. Kontaktvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß bei Ausführung als Tastschalter (20) die Kontaktvorrichtung einen Betätigungshebel (24) und ein Federblech (21) aufweist, dessen Kontaktfläche (22) mit einer Ummantelung (23) versehen ist und daß bei niedergedrücktem Betätigungshebel das Federblech (21) mit einer Leiterbahn (4) elektrisch verbunden ist. 5. Contact device according to claim 4, characterized in that when executed as a push button switch (20), the contact device has an actuating lever (24) and a spring plate (21), the contact surface (22) is provided with a casing (23) and that when depressed Actuating lever, the spring plate (21) is electrically connected to a conductor track (4).
6. Kontaktvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Kontaktvorrichtung (14) einen parallel zur Oberfläche des Leiterplattenkörpers (1.1) verschiebbaren, federnden Kontaktschleifer (8) aufweist, der je nach seiner Lage entweder mit der Leiterbahn (4) oder (5) elektrisch verbunden ist.6. Contact device according to claim 4, characterized in that the contact device (14) has a resilient contact grinder (8) which can be displaced parallel to the surface of the circuit board body (1.1) and which, depending on its position, either with the conductor track (4) or (5) is electrically connected.
7. Kontaktvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Kontaktvorrichtung einen Kontaktschleifer (10.1) aufweist, der einstückig ausgebildet und zugleich bewegliches Teilstück eines Potentiometers (10) ist, dessen gerätefester Teil von einer ummantelten, kreisringfdrmigen Leiterbahn (12) und einer dazu konzentrisch angeordneten, nicht geschlossenen Widerstandsbahn (11) der Leiterplatte (1) gebildet wird.7. Contact device according to claim 4, characterized in that the contact device has a contact grinder (10.1) which is integrally formed and at the same time movable part of a potentiometer (10), the device-fixed part of a coated, annular conductor track (12) and one concentrically arranged, not closed resistance track (11) of the circuit board (1) is formed.
8. Kontaktvorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß der Kontaktschleifer (10.1) des Potentiometers (10) gebildet ist aus einem kreisförmigen, federnden Schleiferkörper, der ummantelte Kontaktwarzen (10.13, 10.12) bzw. (10.11) aufweist, die auf der Ummantelung (13) der Leiterbahn (12) bzw. auf der Widerstandsbahn (11) selbstschmierend gleiten und aus wenigstens zwei etwa rechtwinklig von der Schleiferebene abgebogenen, in eine zentrische Ausnehmung (1.15) der Leiterplatte eingreifenden Lagersegmenten (10.16, 10.17), von denen zumindestens einem Segment (10.16) eine die Leiterplatte untergreifende Schulter (10.15) angeformt ist.8. Contact device according to claim 7, characterized in that the contact grinder (10.1) of the potentiometer (10) is formed from a circular, resilient grinder body which has coated contact warts (10.13, 10.12) or (10.11) which on the casing ( 13) of the conductor track (12) or on the resistance track (11) slide in a self-lubricating manner and from at least two bearing segments (10.16, 10.17), of which at least one segment engages in a central recess (1.15) of the circuit board and is bent approximately at right angles from the grinder plane (10.16) a shoulder (10.15) is formed under the circuit board.
9. Kontaktvorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß auf der Unterseite des Leiterplattenkörpers (1.1) eine die Ausnehmung (1.15) ringförmig umgebende Schicht (12.1) aufgebracht ist, auf der eine der Schulter (10.15) angeformte Nase (10.14) selbstschmierend gleitet, die so bemessen ist, daß durch die vom Kontaktschieifer ausgeübte Biegespannung dessen axiale Sicherung und eine Dreipunktaufläge der Kcntaktwarzen erreicht wird Kontaktvorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß der Kontaktschleifer der Vorrichtung aus elektrisch leitfähigem thermoplastischen Kunststoff mit guter Abriebfestigkeit und guter Dauerfedereigenschaft besteht. 9. Contact device according to claim 8, characterized in that on the underside of the circuit board body (1.1) a recess (1.15) surrounding the layer (12.1) is applied, on which a shoulder (10.15) molded nose (10.14) slides in a self-lubricating manner, which is dimensioned such that the bending stress exerted by the contact slider achieves its axial securing and a three-point support of the contact nipples Contact device according to one of claims 6 to 9, characterized in that the contact grinder of the device consists of electrically conductive thermoplastic material with good abrasion resistance and good permanent spring properties.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82901115T ATE20786T1 (en) | 1981-04-10 | 1982-04-08 | ELECTRICAL CONTACT DEVICE, IN PARTICULAR FOR SMALL ELECTRICAL DEVICES EQUIPPED WITH CIRCUIT BOARDS. |
DE8282901115T DE3271993D1 (en) | 1981-04-10 | 1982-04-08 | Electric contact, particularly for printed circuits of small electric appliances |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3114607810410 | 1981-04-10 | ||
DE3114607 | 1981-04-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1982003723A1 true WO1982003723A1 (en) | 1982-10-28 |
Family
ID=6129916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1982/000082 WO1982003723A1 (en) | 1981-04-10 | 1982-04-08 | Electric contact,particularly for printed circuits of small electric appliances |
Country Status (5)
Country | Link |
---|---|
US (1) | US4511076A (en) |
EP (1) | EP0076292B1 (en) |
JP (1) | JPS58500544A (en) |
DE (1) | DE3271993D1 (en) |
WO (1) | WO1982003723A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0524894A2 (en) * | 1991-07-25 | 1993-01-27 | Amphenol Corporation | Protectively coated electrical connector part |
FR2933530A1 (en) * | 2008-07-07 | 2010-01-08 | Sc2N Sa | Electric switching device for sub-steering wheel control lever of motor vehicle, has cleaning element placed on path of contactor element, between positions of contactor element and close to pads, so that contactor element is cleaned |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62123707A (en) * | 1985-11-22 | 1987-06-05 | 株式会社村田製作所 | Manufacture of electronic parts |
DE19904979A1 (en) * | 1999-02-06 | 2000-08-10 | Valeo Schalter & Sensoren Gmbh | Printed circuit board for an electrical switch |
US6312265B1 (en) | 1999-08-27 | 2001-11-06 | Seagate Technology Llc | Double-sided single-print straddle mount assembly |
US7918383B2 (en) * | 2004-09-01 | 2011-04-05 | Micron Technology, Inc. | Methods for placing substrates in contact with molten solder |
DE102005014934B3 (en) * | 2005-04-01 | 2006-10-19 | Diehl Ako Stiftung & Co. Kg | Electric switch |
JP2013108598A (en) * | 2011-11-24 | 2013-06-06 | Nihon Mekki Industry Co Ltd | Sliding part and method for manufacturing the same |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR817741A (en) * | 1936-02-11 | 1937-09-09 | Elek Sche Glu Hlampenfabriken | Resistor with regulating layer or potentiometer |
FR1483948A (en) * | 1966-04-28 | 1967-06-09 | Lorraine Carbone | New products for the improvement of electrical contacts |
US3610811A (en) * | 1969-06-02 | 1971-10-05 | Honeywell Inf Systems | Printed circuit board with solder resist gas escape ports |
US3673539A (en) * | 1970-05-11 | 1972-06-27 | Bunker Ramo | Electrical resistance element with a semiconductor overlay |
FR2124457A1 (en) * | 1971-02-04 | 1972-09-22 | Tektronix Inc | |
FR2241856A1 (en) * | 1973-08-24 | 1975-03-21 | Globe Union Inc | |
FR2308174A1 (en) * | 1975-04-17 | 1976-11-12 | Ruf Kg Wilhelm | CONTACT SPRING FOR VARIABLE RESISTORS AND POTENTIOMETERS |
DE2921753A1 (en) * | 1978-05-31 | 1979-12-06 | Int Standard Electric Corp | ROTARY SWITCH |
FR2430165A1 (en) * | 1978-06-29 | 1980-01-25 | Rogers Corp | CIRCUIT BOARD AND MANUFACTURING METHOD THEREOF |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3249910A (en) * | 1963-07-19 | 1966-05-03 | Douglas A Venn | Electrical connector with solder resistant surfaces |
US3327663A (en) * | 1964-03-25 | 1967-06-27 | Man Sew Corp | Compensating presser feet |
JPS4839441B1 (en) * | 1969-07-01 | 1973-11-24 | ||
US3620839A (en) * | 1969-07-28 | 1971-11-16 | Amp Inc | Lubrication of contact surfaces |
DE2537249C3 (en) * | 1975-08-21 | 1979-06-28 | Preh Elektrofeinmechanische Werke Jakob Preh Nachf., Gmbh + Co, 8740 Bad Neustadt | Adjustable resistance with switch |
US4038504A (en) * | 1975-11-19 | 1977-07-26 | A.C. Nielsen Company | Rotary, printed circuit wafer switch and method for adjusting |
US4045636A (en) * | 1976-01-28 | 1977-08-30 | Bowmar Instrument Corporation | Keyboard switch assembly having printed circuit board with plural layer exposed contacts and undersurface jumper connections |
DE7624175U1 (en) * | 1976-07-31 | 1976-11-25 | Wilhelm Ruf Kg, 8000 Muenchen | keyboard |
JPS5927940B2 (en) * | 1976-09-14 | 1984-07-09 | キヤノン株式会社 | small calculator |
US4057520A (en) * | 1976-10-05 | 1977-11-08 | Rite Autotronics Corporation | Slide switch assembly having flexible housing with movable contacts mounted on printed circuit board |
DE2757984C2 (en) * | 1977-12-24 | 1985-07-04 | Brown, Boveri & Cie Ag, 6800 Mannheim | Lubrication of the contact points of electrical switches |
US4184140A (en) * | 1978-12-14 | 1980-01-15 | Allen Bradley Company | Two-piece trimming potentiometer |
US4243852A (en) * | 1979-04-16 | 1981-01-06 | Oak Industries Inc. | Membrane switch with means for impeding silver migration |
-
1982
- 1982-04-08 WO PCT/DE1982/000082 patent/WO1982003723A1/en active IP Right Grant
- 1982-04-08 JP JP57501214A patent/JPS58500544A/en active Pending
- 1982-04-08 US US06/613,749 patent/US4511076A/en not_active Expired - Fee Related
- 1982-04-08 DE DE8282901115T patent/DE3271993D1/en not_active Expired
- 1982-04-08 EP EP82901115A patent/EP0076292B1/en not_active Expired
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR817741A (en) * | 1936-02-11 | 1937-09-09 | Elek Sche Glu Hlampenfabriken | Resistor with regulating layer or potentiometer |
FR1483948A (en) * | 1966-04-28 | 1967-06-09 | Lorraine Carbone | New products for the improvement of electrical contacts |
US3610811A (en) * | 1969-06-02 | 1971-10-05 | Honeywell Inf Systems | Printed circuit board with solder resist gas escape ports |
US3673539A (en) * | 1970-05-11 | 1972-06-27 | Bunker Ramo | Electrical resistance element with a semiconductor overlay |
FR2124457A1 (en) * | 1971-02-04 | 1972-09-22 | Tektronix Inc | |
FR2241856A1 (en) * | 1973-08-24 | 1975-03-21 | Globe Union Inc | |
FR2308174A1 (en) * | 1975-04-17 | 1976-11-12 | Ruf Kg Wilhelm | CONTACT SPRING FOR VARIABLE RESISTORS AND POTENTIOMETERS |
DE2921753A1 (en) * | 1978-05-31 | 1979-12-06 | Int Standard Electric Corp | ROTARY SWITCH |
FR2430165A1 (en) * | 1978-06-29 | 1980-01-25 | Rogers Corp | CIRCUIT BOARD AND MANUFACTURING METHOD THEREOF |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0524894A2 (en) * | 1991-07-25 | 1993-01-27 | Amphenol Corporation | Protectively coated electrical connector part |
EP0524894A3 (en) * | 1991-07-25 | 1993-08-25 | Amphenol Corporation | Protectively coated electrical connector part |
FR2933530A1 (en) * | 2008-07-07 | 2010-01-08 | Sc2N Sa | Electric switching device for sub-steering wheel control lever of motor vehicle, has cleaning element placed on path of contactor element, between positions of contactor element and close to pads, so that contactor element is cleaned |
Also Published As
Publication number | Publication date |
---|---|
EP0076292B1 (en) | 1986-07-16 |
US4511076A (en) | 1985-04-16 |
DE3271993D1 (en) | 1986-08-21 |
EP0076292A1 (en) | 1983-04-13 |
JPS58500544A (en) | 1983-04-07 |
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