DE202007018660U1 - High temperature brazing - Google Patents

Abstract

contraption for electrically conductive connection of an electrically insulated with an electrically non-insulated microcomponent by means of soldering, in which the point to be contacted of the electrically isolated microcomponent via the contact pads of the electrically insulated microcomponent is positioned and heated by means of a thermode, which Made of a heatable ceramic pencil that is a mixed ceramic with an insulating and an electrically conductive Contains ceramic, wherein the electrically non-conductive component Baked enamel wire and the electrically conductive component of the contact surface a chip module is.

Description

The The invention relates to a device for electrically conductive connection an electrically insulated with an electrically non-insulated Microcomponent.

preferred Field of application is the connection of enamelled wire with the contact surface a chip module in contactless transponders. Under contactless Transponders are understood to mean microelectronic arrangements, containing a semiconductor chip and an antenna, for example Contactless smart cards, goods or packaged goods with incorporated Antenna and transponder chip, electronic contactless labels, Tickets, banknotes, etc.

at such arrangements are usually on the front an antenna carrier, the antenna tracks and the contact points arranged for contacting the semiconductor chip. One common method of contacting is the so-called thermo-compression welding. It is a resistance welding process, in the case of very low voltages and high currents is working. The high current requires accordingly large cable cross sections of the welding cables and This leads to a very complex and costly Periphery.

For the heating required during welding or soldering The joint requires special tools.

To DE 103 07 832 A1 is a tool for joining two objects known, which is suitable for soldering tin-coated sheets and for welding Teflon films. The tool described therein is designed in the form of a heatable pin, which consists of a ceramic and has a smoothed surface, which can transfer the heat to at least one of the objects.

Furthermore, in DD 38 494 A describes a method for tinning solderable enameled wire, wherein the enameled wire is immersed in a tin bath, whereby the lacquer substance evaporates and the wire is tinned. The connection of an electrically insulated wire with an electrically non-insulated microcomponent is not possible with this method.

Of the Invention is the object of a device of the initially specify the type with which an automated connection reached with short cycle time and long tool life becomes.

According to the invention the object with a device which contains the specified in claim 1, solved.

at the device of the invention is to contacting point of the electrically insulated microcomponent over the contact pads of the electrically isolated microcomponent positioned and then adding a solder heated by a thermode. The thermode consists of a heatable Ceramic pencil made of a mixed ceramic, which is an insulating and contains an electrically conductive ceramic.

Especially Advantageously, the device is applicable for connecting a baked enamel wire with the contact surface of a chip module.

• 1) Durch die Verwendungsmöglicht einer sehr hohen Temperatur (> 500°C) „verdampft" die Isolationsschicht, so dass das Entfernung der Isolation des elektrisch isolierten Bauteils, das Aufschmelzen des Lotes und das Andrücken der beiden Gegenstände in einem Arbeitsschritt erfolgen.
• 2) Durch die sehr hohe Temperatur wird eine Reduzierung der Lötzeit des Heizelementes auf deutlich unter 1 s ermöglicht.
• 3) Es erfolgt eine Selbstreinigung des keramischen Heizelements durch kurzzeitiges Erhöhen der Temperatur bis auf maximal 1100°C.
• 4) Es besteht eine weitgehend freie Gestaltbarkeit der beheizten Oberfläche.
• 5) Die Temperatur des Heizelementes kann in einfacher Weise, zum Beispiel mittels Stelltrafo, geregelt werden und das Verfahren ist somit ein sehr kostengünstig.
• 6) Durch kleinstmögliche Auslegung des beheizten Bereiches erfolgt nur eine geringe Wärmeableitung an die Umgebung, so dass benachbarte Baugruppen nicht belastet werden.
• 7) Durch die keramische Oberfläche bestehen ein geringes Anhaftverhalten des Lotes am Heizelement und eine geringe Benetzung mit flüssigen Metallen.
• 8) Es ist ein sehr schnelles zyklisches Aufheizen des keramischen Heizelementes möglich, wobei Aufheizgeschwindigkeiten von ca. 700°C/s erreicht werden, so dass eine hohe Dynamik für Temperaturänderungen erreicht wird.
• 9) Das verwendete Keramikwerkzeug weist einen sehr geringen Verschleiß und damit eine hohe Lebensdauer auf.
• 10) Die für das Verfahren erforderliche Anordnung ist sehr beständig gegen Oxidation, Säuren, Ätzgase und schwachen Basen.
• 11) Das Keramikwerkzeug zeichnet sich durch hohe mechanische Festigkeit, gute Wärmeleitfähigkeit, hohen Isolationswiderstand und hohe Durchschlagfestigkeit aus.

The invention is characterized by a number of advantages. These include in particular:

• 1) The use of a very high temperature (> 500 ° C) "evaporates" the insulation layer, so that the removal of the insulation of the electrically insulated component, the melting of the solder and the pressing of the two objects in one step.
• 2) Due to the very high temperature, it is possible to reduce the soldering time of the heating element to well below 1 s.
• 3) A self-cleaning of the ceramic heating element by briefly increasing the temperature up to a maximum of 1100 ° C.
• 4) There is a largely free configurability of the heated surface.
• 5) The temperature of the heating element can be controlled in a simple manner, for example by means of a regulating transformer, and the method is thus a very cost-effective.
• 6) The smallest possible design of the heated area is only a small heat dissipation to the environment, so that adjacent modules are not charged.
• 7) Due to the ceramic surface there is a low adhesion of the solder to the heating element and a low wetting with liquid metals.
• 8) It is a very fast cyclic heating of the ceramic heating element possible, with heating rates of about 700 ° C / s can be achieved, so that a high dynamics for temperature changes is achieved.
• 9) The ceramic tool used has a very low wear and thus a long service life.
• 10) The arrangement required for the process is very resistant to oxidation, acids, caustic gases and weak bases.
• 11) The ceramic tool is characterized by high mechanical strength, good thermal conductivity, high insulation resistance and high dielectric strength.

embodiments The invention will be described below with reference to a drawing explained.

1 shows the basic structure of the example of contacting a wire antenna with chip module.

1 illustrates an example arrangement for high temperature soldering. The task here is to connect the wire antenna e to the chip module d and to establish an electrical contact between the two. For this purpose, the ceramic heating element a is positioned over the contact point or over the contact pads of the chip module d. By a suitable means a certain amount of solder wire c is supplied to the contact point under the ceramic heater a. Preferably, a solder wire with flux is used. With the help of a hold-down b it is ensured that the solder wire c is exactly positioned.

By Applying a voltage, the ceramic heater a to a certain Temperature brought. After reaching the temperature, the heating element a pressed with the heated surface on the contact point. Due to the high temperature, the insulating layer of the baked enamel wire removed and the solder melted.

a

ceramic heating element

b

Stripper plate

c

solder wire

d

chip module

e

wire antenna consisting of baked enamel wire

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10307832 A1 [0005]
• - DD 38494 A [0006]

Claims (1)

Device for electrically conductive connection an electrically insulated with an electrically non-insulated Micro-component by means of soldering, in which the to be contacted Position of the electrically isolated microcomponent over the Contact pads of the electrically isolated microcomponent is positioned and heated by means of a thermode, which Made of a heatable ceramic pencil that is a mixed ceramic with an insulating and an electrically conductive Contains ceramic, wherein the electrically non-conductive component Baked enamel wire and the electrically conductive component of the contact surface a chip module is.