EP0437673B1 - Combination of connecting lead and contact surface out of metal layers on electrical resistors for the attachment of connecting leads - Google Patents
Combination of connecting lead and contact surface out of metal layers on electrical resistors for the attachment of connecting leads Download PDFInfo
- Publication number
- EP0437673B1 EP0437673B1 EP90115768A EP90115768A EP0437673B1 EP 0437673 B1 EP0437673 B1 EP 0437673B1 EP 90115768 A EP90115768 A EP 90115768A EP 90115768 A EP90115768 A EP 90115768A EP 0437673 B1 EP0437673 B1 EP 0437673B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact surface
- connecting wire
- web
- contact
- combination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 title description 5
- 239000002184 metal Substances 0.000 title description 5
- 239000011247 coating layer Substances 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
- H01C1/142—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors the terminals or tapping points being coated on the resistive element
Definitions
- the invention relates to a combination of connecting wire and contact surface made of metal layers on electrical resistors for fastening connecting wires, in which the contact zone between connecting wire and contact surface is at least 5 times larger than the smaller cross section of connecting wire or contact surface.
- the area of the contact (contact wire) between the connecting wire and the contact area of the electrical resistance is considerably larger than the cross-sectional area of the electrical supply line (connecting wire and contact areas).
- Such a contact zone is created e.g. thermocompression welding. Normally, this contact zone between the connecting wire and the contact surface is at least 5 times larger than the smallest cross section of the connecting wire or contact surface.
- the contact areas of the electrical sheet resistors usually consist of rectangular areas that are electrically connected to the resistor.
- This object is achieved in that there are two separate and electrically insulated areas within the contact area, between which there is an electrically conductive web, and that the connecting wire is fastened to the web and the two insulated areas.
- the web preferably has a parabolic cross-sectional taper from the outside inward in the region of the contact zone. It is also advantageous if the isolated areas are designed as rectangles.
- the web can be designed in different ways: a web with the same cross-section over the entire length of the web always provides the same electrical cross-sectional area as the contact zone, regardless of the position of the connecting wire across the web. If the connecting wire is incorrectly positioned on the web, only the error in the position along the web will be included in the scatter of the electrical resistance value. This error is also compensated for in the case of a web with a variable cross section along the web. With the same thickness, the width variation is selected so that the overall resistance of the connection remains constant when the wire contact point is displaced along the web.
- a possible cross-sectional geometry has a parabolic profile under the ideally hidden contact zone. When the contact on the web is shifted, the electrical resistance of the supply line becomes smaller on one side, but increases on the other side by a larger amount, so that the total resistance of the connection remains the same.
- the total resistance can be reduced by using other web profiles.
- the error is not fully compensated for but only reduced (e.g. triangular profile instead of parabola).
- These structured contact surfaces which are provided with webs, can be used for electrical resistances made of all possible materials (e.g. metals such as platinum, nickel; semiconductors such as silicon; conductive plastics), manufactured using thin or thick film technology or from foils. Suitable methods for producing the structures are, for example, laser structuring, dry or wet etching.
- the webs can be longitudinal or transverse to the component geometry, in special cases they can be angled or curved instead of straight.
- the width can be varied by means of edge modulation on both sides.
- Post-treatment steps of the contact surfaces e.g. reinforcement of the connection surfaces
- Post-treatment steps of the contact surfaces have no significant influence on the properties of the webs.
- Known attachment methods for the connecting wires are thermocompression welding / bonding, gap welding, soldering or other methods which produce a sufficiently large contact area with the component.
- FIG. 1 The figures schematically show a top view of the contact surfaces structured according to the invention, a bar with a constant cross section being shown in Figure I and a bar with a parabolically tapered cross section being shown in Figure II.
- the contact area (1) there are two rectangular, separated and electrically insulated areas (2).
- a web (3) is formed between these two isolated areas (2).
- the connection wires (4) are fastened in such a way that the contact zone (5) extends to the web (3) and the two insulated areas (2).
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Details Of Resistors (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Description
Kombination von Anschlußdraht und Kontaktfläche aus Metallschichten an elektrischen Widerständen zur Befestigung von Anschlußdrähten.Combination of connecting wire and contact surface made of metal layers on electrical resistors for fastening connecting wires.
Die Erfindung betrifft eine Kombination von Anschlußdraht und Kontaktfläche aus Metallschichten an elektrischen Widerständen zur Befestigung von Anschlußdrähten, bei denen die Kontaktzone zwischen Anschlußdraht und Kontaktfläche mindestens um den Faktor 5 größer ist als der kleinere Querschnitt von Anschlußdraht oder Kontaktfläche.The invention relates to a combination of connecting wire and contact surface made of metal layers on electrical resistors for fastening connecting wires, in which the contact zone between connecting wire and contact surface is at least 5 times larger than the smaller cross section of connecting wire or contact surface.
Bei der Kontaktierung von elektrischen Widerständen aus Folien oder Schichten (z.B. Platindünnschichtwiderstände zur Temperaturmessung), werden Verfahren zum Befestigen der Anschlußdrähte auf den Kontaktflächen eingesetzt, die eine erhebliche Streuung der Befestigungsorte auf den Kontaktflächen bedingen. Um den Einfluß auf die elektrischen Widerstandswerte möglichst gering zu halten, sind die Kontaktflächen relativ groß ausgelegt. Die Toleranzen bei der Positionierung der Anschlußdrähte zum Anbringen auf dem elektrischen Widerstand sind jedoch zum Teil so groß, daß hierdurch eine deutliche Streuung des elektrischen Widerstandswertes des einzelnen Widerstandes um einen Mittelwert erfolgt.When contacting electrical resistors made of foils or layers (e.g. platinum thin-film resistors for temperature measurement), methods are used to fasten the connecting wires on the contact surfaces, which cause considerable scattering of the fastening locations on the contact surfaces. In order to keep the influence on the electrical resistance values as low as possible, the contact areas are designed to be relatively large. The tolerances in the positioning of the connecting wires for attachment to the electrical resistor are, however, so large in some cases that this results in a clear spread of the electrical resistance value of the individual resistor around an average value.
Bei den meisten Kontaktierungsverfahren ist die Fläche des Kontakts (Kontaktzonge) zwischen dem Anschlußdraht und der Kontaktfläche des elektrischen Widerstands erheblich größer, als die Querschnittsfläche der elektrischen Zuleitung (Anschlußdraht und Kontaktflächen).In most contacting methods, the area of the contact (contact wire) between the connecting wire and the contact area of the electrical resistance is considerably larger than the cross-sectional area of the electrical supply line (connecting wire and contact areas).
Eine solche Kontaktzone entsteht z.B. beim Thermokompressionsschweißen. Normalerweise ist diese Kontaktzone zwischen Anschlußdraht und Kontaktfläche mindestens um den Faktor 5 größer als der kleinste Querschnitt von Anschlußdraht oder Kontaktfläche.Such a contact zone is created e.g. thermocompression welding. Normally, this contact zone between the connecting wire and the contact surface is at least 5 times larger than the smallest cross section of the connecting wire or contact surface.
Die Kontaktflächen der elektrischen Schichtwiderstände bestehen meist aus rechteckige Flächen, die mit dem Widerstand elektrisch verbunden sind.The contact areas of the electrical sheet resistors usually consist of rectangular areas that are electrically connected to the resistor.
Es war daher Aufgabe der vorliegenden Erfindung, die Kontaktflächen aus Metallschichten an elektrischen Widerständen zur Befestigung von Anschlußdrähten, bei denen die Kontaktzone zwischen Anschlußdraht und Kontaktfläche mindestens um den Faktor 5 größer ist als der kleinere Querschnitt von Anschlußdraht oder Kontaktfläche, so auszubilden, daß die Position der Anschlußdrähte auf der Kontaktfläche einen möglichst geringen Einfluß auf den elektrischen Widerstandswert ausübt.It was therefore an object of the present invention to form the contact surfaces made of metal layers on electrical resistors for fastening connecting wires, in which the contact zone between the connecting wire and the contact surface is at least 5 times larger than the smaller cross section of the connecting wire or contact surface so that the position the connection wires on the contact surface exert as little influence as possible on the electrical resistance value.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß innerhalb der Kontaktfläche zwei voneinander getrennte und elektrisch isolierte Bereiche vorhanden sind, zwischen denen sich ein elektrisch leitender Steg befindet, und daß der Anschlußdraht auf dem Steg und den beiden isolierten Bereichen befestigt ist.This object is achieved in that there are two separate and electrically insulated areas within the contact area, between which there is an electrically conductive web, and that the connecting wire is fastened to the web and the two insulated areas.
Vorzugsweise weist der Steg jeweils von außen nach innen im Bereich der Kontaktzone eine parabolische Querschnittsverjüngung auf. Ebenso ist von Vorteil, wenn die isolierten Bereiche als Rechtecke ausgebildet sind.The web preferably has a parabolic cross-sectional taper from the outside inward in the region of the contact zone. It is also advantageous if the isolated areas are designed as rectangles.
Die Ausbildung des Stegs kann in unterschiedlicher Weise erfolgen: ein Steg mit gleichem Querschnitt über die gesamte Länge des Stegs bietet unabhängig von der Position des Anschlußdrahtes quer zum Steg immer die gleiche elektrische Querschnittsfläche als Kontaktzone. Bei einer Fehlpositionierung des Anschlußdrahtes auf dem Steg wird nur noch der Fehler in der Position längs des Stegs in die Streuung des elektrischen Widerstandswertes eingehen. Bei einem Steg mit veränderlichem Querschnitt längs des Steges kompensiert sich auch dieser Fehler. Bei gleicher Dicke wird die Breitenvariation so gewählt, daß bei einer Verschiebung des Drahtaufsetzpunktes längs des Stegs der Gesamtwiderstand des Anschlusses konstant bleibt. Eine mögliche Querschnittsgeometrie weist unter der im Idealfall verdeckten Kontaktzone ein parabolisches Profil auf. Bei einer Verschiebung des Kontakts auf dem Steg, wird so der elektrische Widerstand der Zuleitung auf der einen Seite kleiner, auf der anderen Seite jedoch um einen größeren Betrag ansteigen, so daß der Gesamtwiderstand des Anschlusses gleich bleibt.The web can be designed in different ways: a web with the same cross-section over the entire length of the web always provides the same electrical cross-sectional area as the contact zone, regardless of the position of the connecting wire across the web. If the connecting wire is incorrectly positioned on the web, only the error in the position along the web will be included in the scatter of the electrical resistance value. This error is also compensated for in the case of a web with a variable cross section along the web. With the same thickness, the width variation is selected so that the overall resistance of the connection remains constant when the wire contact point is displaced along the web. A possible cross-sectional geometry has a parabolic profile under the ideally hidden contact zone. When the contact on the web is shifted, the electrical resistance of the supply line becomes smaller on one side, but increases on the other side by a larger amount, so that the total resistance of the connection remains the same.
Durch Verwendung anderer Stegprofile kann der Gesamtwiderstand gesenkt werden. Durch Verwendung einfacherer Profile wird der Fehler nicht vollständig kompensiert sondern nur verringert (z.B. Dreieckprofil statt Parabel).The total resistance can be reduced by using other web profiles. By using simpler profiles, the error is not fully compensated for but only reduced (e.g. triangular profile instead of parabola).
Diese strukturierten, mit Stegen versehenen Kontaktflächen, sind einsetzbar für elektrische Widerstände aus allen möglichen Materialien (z.B. Metalle wie Platin, Nickel; Halbleiter wie Silizium; leitende Kunststoffe), hergestellt in Dünn- oder Dickschichttechnik oder aus Folien. Geeignete Verfahren zur Herstellung der Strukturen sind beispielsweise Laserstukturieren, Trocken- oder Naßätzen.These structured contact surfaces, which are provided with webs, can be used for electrical resistances made of all possible materials (e.g. metals such as platinum, nickel; semiconductors such as silicon; conductive plastics), manufactured using thin or thick film technology or from foils. Suitable methods for producing the structures are, for example, laser structuring, dry or wet etching.
Die Stege können längs oder quer zur Bauelementgeometrie liegen, in speziellen Fällen können sie statt gerade gewinkelt oder gebogen sein. Die Breitenvariation kann durch beidseitige Kantenmodulation erfolgen.The webs can be longitudinal or transverse to the component geometry, in special cases they can be angled or curved instead of straight. The width can be varied by means of edge modulation on both sides.
Nachbehandlungsschritte der Kontaktflächen (z.B. Verstärkung der Anschlußflächen) haben auf die Eigenschaften der Stege keinen wesentlichen Einfluß. Es ist jedoch denkbar, statt einer Breitenmodulation eine Dickenmodulation der Stege durchzuführen.Post-treatment steps of the contact surfaces (e.g. reinforcement of the connection surfaces) have no significant influence on the properties of the webs. However, it is conceivable to carry out a thickness modulation of the webs instead of a width modulation.
Bekannte Anbringungsverfahren für die Anschlußdrähte sind Thermokompressionsschweißen /-bonden, Spaltkopfschweißen, Löten oder andere Verfahren, die eine genügend große Kontaktfläche zum Bauelement herstellen.Known attachment methods for the connecting wires are thermocompression welding / bonding, gap welding, soldering or other methods which produce a sufficiently large contact area with the component.
Die Abbildungen zeigen schematisch erfindungsgemäß strukturierte Kontaktflächen in Aufsicht, wobei in Abbildung I ein Steg mit gleichbleibendem Querschnitt und in Abbildung II ein Steg mit parabolisch verjüngtem Querschnitt dargestellt ist.The figures schematically show a top view of the contact surfaces structured according to the invention, a bar with a constant cross section being shown in Figure I and a bar with a parabolically tapered cross section being shown in Figure II.
Innerhalb der Kontaktfläche (1) befinden sich zwei rechteckige, voneinander getrennte und elektrisch isolierte Bereiche (2). Zwischen diesen beiden isolierten Bereichen (2) ist ein Steg (3) ausgebildet. Die Befestigung der Anschlußdrähte (4) erfolgt in der Weise, daß sich die Kontaktzone (5) auf den Steg (3) und die beiden isolierten Bereiche (2) erstreckt.Within the contact area (1) there are two rectangular, separated and electrically insulated areas (2). A web (3) is formed between these two isolated areas (2). The connection wires (4) are fastened in such a way that the contact zone (5) extends to the web (3) and the two insulated areas (2).
Claims (3)
- Combination of connecting wire and a contact surface made of metallic coating layers on electrical resistors for the attachment of connecting wires for which the areas of contact between a connecting wire and a contact surface is at least greater by a factor of five than the smaller cross-sectional area of a said connecting wire or contact surface,
wherein
there are two zones (2), between which there is an electrically conductive web (3), which are separated and electrically insulated from each other inside a contact surface (1), and a said connecting wire (4) is attached to a said web (3) and two said insulated zones (2). - Combination of connecting wire and a contact surface in accordance with claim 1,
wherein
a web (3) in each case shows parabolic cross-sectional tapering in the inward direction in the area of a contact zone (5) between a said web (3) and a connecting wire (4). - Combination of connecting wire and a contact surface in accordance with either claim 1 or 2,
wherein
insulated zones (2) have a rectangular shape.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4001337 | 1990-01-18 | ||
| DE4001337A DE4001337C1 (en) | 1990-01-18 | 1990-01-18 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0437673A2 EP0437673A2 (en) | 1991-07-24 |
| EP0437673A3 EP0437673A3 (en) | 1992-04-15 |
| EP0437673B1 true EP0437673B1 (en) | 1994-11-02 |
Family
ID=6398314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90115768A Expired - Lifetime EP0437673B1 (en) | 1990-01-18 | 1990-08-17 | Combination of connecting lead and contact surface out of metal layers on electrical resistors for the attachment of connecting leads |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0437673B1 (en) |
| DE (2) | DE4001337C1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4034149A (en) * | 1975-10-20 | 1977-07-05 | Western Electric Company, Inc. | Substrate terminal areas for bonded leads |
| US4286249A (en) * | 1978-03-31 | 1981-08-25 | Vishay Intertechnology, Inc. | Attachment of leads to precision resistors |
| DE3722576A1 (en) * | 1987-07-08 | 1989-01-19 | Danfoss As | ELECTRIC LAYER RESISTANCE AND METHOD FOR PRODUCING THE SAME |
-
1990
- 1990-01-18 DE DE4001337A patent/DE4001337C1/de not_active Expired - Lifetime
- 1990-08-17 DE DE59007634T patent/DE59007634D1/en not_active Expired - Fee Related
- 1990-08-17 EP EP90115768A patent/EP0437673B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4001337C1 (en) | 1991-04-25 |
| EP0437673A3 (en) | 1992-04-15 |
| DE59007634D1 (en) | 1994-12-08 |
| EP0437673A2 (en) | 1991-07-24 |
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