EP0118841B1 - Method of sealing a relay - Google Patents

Method of sealing a relay Download PDF

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Publication number
EP0118841B1
EP0118841B1 EP84102158A EP84102158A EP0118841B1 EP 0118841 B1 EP0118841 B1 EP 0118841B1 EP 84102158 A EP84102158 A EP 84102158A EP 84102158 A EP84102158 A EP 84102158A EP 0118841 B1 EP0118841 B1 EP 0118841B1
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EP
European Patent Office
Prior art keywords
relay
gas
filling
hood
wall
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
Application number
EP84102158A
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German (de)
French (fr)
Other versions
EP0118841A2 (en
EP0118841A3 (en
Inventor
Werner Minks
Bernhard Franz Nitschke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent NV
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Alcatel NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel NV filed Critical Alcatel NV
Priority to AT84102158T priority Critical patent/ATE32151T1/en
Publication of EP0118841A2 publication Critical patent/EP0118841A2/en
Publication of EP0118841A3 publication Critical patent/EP0118841A3/en
Application granted granted Critical
Publication of EP0118841B1 publication Critical patent/EP0118841B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/023—Details concerning sealing, e.g. sealing casing with resin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor

Definitions

  • the present invention relates to a method for sealing an electromagnetic relay according to the preamble of claim 1.
  • Such a method is known from DE-A2 461 427.
  • a filling opening is provided in the floor, which is only closed after the base part has been poured and the interior of the relay has been filled with gas.
  • a similar process is known from DE-A-2 618 492. The opening is there to allow pressure equalization between the interior and exterior during curing.
  • the object is to be achieved in a sealing method of the type mentioned at the outset to prevent casting compound or too much casting compound from flowing inwards during sealing.
  • the internal atmosphere of the relay should remain free of harmful gases, particularly those that occur during potting.
  • the internal pressure in the relay prevents the potting compound from running inwards and coming into contact with components and thus impairing the usability of the relay. It was not possible to determine any air ducts that formed in the casting compound.
  • the harmful gases can escape through the opening of the wall of the gas filling opening in the cup-like hood after the gelling compound has hardened or hardened.
  • the interior can then be degassed and flushed or filled with inert gas and then the ventilation hole closed.
  • the opening of the hood is easier to do than in a base part, since the hood is not exposed to the high temperature of the base part when soldering into a printed circuit, for example, and can therefore be made of thermoplastic material.
  • Fig. 1 designates a cup-shaped hood, in the top 2 of which an inwardly projecting funnel-shaped, outwardly widening gas filling opening 3 is provided.
  • the wall 4 of the gas filling opening 3 is initially closed.
  • the hood 1 is advantageously an injection molded or pressed part made of plastic.
  • the side walls 5 extend downward and extend with their end edge 6 to the underside 7 of a housing base 8 or even protrude slightly above them.
  • the housing base 8 is part of an inner housing lower part, which contains the magnet system 9 and the contact system 10 (FIG. 5) as well as the connection elements 11 (FIG. 5).
  • a plurality of ribs 12 are provided on the inside of the hood, the ends 13 of which, in the assembled state, rest on the upper edge of the lower housing part or its side walls.
  • the wall 4 of the gas filling opening 3 can be pierced, so that a hole 14 is formed (Fig. 3).
  • This hole 14 is only made so large that a potting compound filled in for subsequent sealing does not drip into the housing due to the capillary action and / or the surface tension and / or the viscosity.
  • the ventilation hole is preferably 0.1 to 0.8 mm in diameter or a slot with a slot width of 0.1 to 0.6 mm.
  • the inside of the lower end edges 6 of the hood side walls 5 is chamfered (FIG. 4), so that potting compound applied from below can run better into the separating slot 16 between the hood side walls 5 and the housing base 8.
  • a dense relay that works perfectly even with a very large number of switching cycles is obtained in that the relay is first assembled and the hood 1 is pushed on (FIG. 5, method section I). The relay is then set up or held so that the top 2 of the hood 1 points downwards (FIG. 5, method section 11). In this position, a self-curing or z. B. applied by energy supply curable potting compound 15 (process section 111) and then the potting compound by supplying energy, in particular by a heating device 17 or hot air, etc., gelled or fully cured. The wall 4 of the filling opening 3 of the hood 1 is then pierced or pierced, for example by means of a fine needle, and the ventilation hole 14 is thereby formed.
  • the ventilation hole 14 can also on one of the Side walls 5 of the hood 1 may be provided.
  • the interior of the relay can be degassed through the ventilation hole 14, after which the ventilation hole 14 is closed, or the interior is previously flushed with dry air, hydrogen and / or inert gas in a special process section (process section V) or, for example, at a negative pressure of up to 10 - Degassed 5 bar in a vacuum chamber 18.
  • Degassing is preferably carried out at an elevated temperature between 130 and 180 ° C with the relay in the normal position. Harmful components escape from the plastics used for later operation. From this, the interior is expediently, preferably after cooling to normal temperature, with an inert gas, such as. B. helium, argon or nitrogen, or filled with hydrogen or dried air and then placed in the normal position of the relay potting compound 15 in the filler opening 3 and then cured.
  • an inert gas such as. B. helium, argon or nitrogen
  • a heated needle is used to pierce the wall 4 of the filling opening 3. .
  • the wall material consists of a thermoplastic.

Abstract

A relay is sealed with a sealing compound when the relay housing is in a closed state, thus causing an air cushion to be formed in the inside, with an afterflow of sealing compound into the interior being prevented. Following gelling or curing of the sealing compound, a vent hole is pierced into the relay housing which, if required, may be closed following degassing of the interior space of the relay.

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zum Abdichten eines elektromagnetischen Relais gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a method for sealing an electromagnetic relay according to the preamble of claim 1.

Ein derartiges Verfahren ist bekannt aus der DE-A2 461 427. Dort ist eine Einfüllöffnung im Boden vorgesehen, die erst nach dem Vergießen des Bodenunterteils und Füllen des Relaisinneren mit Gas verschlossen wird. Ein ähnliches Verfahren ist aus der DE-A-2 618 492 bekannt. Die Öffnung dient dort dazu, während des Aushärtens einen Druckausgleich zwischen Innen- und Außenraum zu ermöglichen.Such a method is known from DE-A2 461 427. There, a filling opening is provided in the floor, which is only closed after the base part has been poured and the interior of the relay has been filled with gas. A similar process is known from DE-A-2 618 492. The opening is there to allow pressure equalization between the interior and exterior during curing.

Aus der DE-A-2 732 517 ist es bekannt, eine dünnwandige Durchbruchstelle an einer wand eines Relaisgehäuses vorzusehen, und diese beim Einlöten des Relais auf Leiterplatten und Reinigen der Leiterplatten noch geschlossen zu halten, damit kein Lötmittel und keine Reinigungsflüssigkeit in das Innere des Relais dringt. Die Öffnung der Durchbruchstelle erfolgt erst nach dem Einbau des Relais. Gemäß der EP-A-0 053 870 ist eine im Boden eines Relais befindliche Öffnung erst nach dem Vergießen und Aushärten zu schließen, da sich sonst durch den hohen Innendruck schädliche Luftkanäle in der Vergußmasse bilden.From DE-A-2 732 517 it is known to provide a thin-walled breakthrough on a wall of a relay housing, and to keep this closed when soldering the relay onto printed circuit boards and cleaning the printed circuit boards, so that no solder and no cleaning fluid into the interior of the Relay penetrates. The breakthrough point only opens after the relay has been installed. According to EP-A-0 053 870, an opening in the bottom of a relay can only be closed after casting and curing, since otherwise harmful air channels are formed in the casting compound due to the high internal pressure.

Mit der vorliegenden Erfindung soll die Aufgabe gelöst werden, bei einem Abdichtverfahren der eingangs genannten Art zu verhindern, daß Vergußmasse oder zuviel Vergußmasse beim Abdichten nach innen fließt. Gleichzeitig soll die Innenatmosphäre des Relais von schädlichen, besonders beim Vergießen auftretenden Gasen freibleiben.With the present invention, the object is to be achieved in a sealing method of the type mentioned at the outset to prevent casting compound or too much casting compound from flowing inwards during sealing. At the same time, the internal atmosphere of the relay should remain free of harmful gases, particularly those that occur during potting.

Diese Aufgabe wird erfindungsgemäß durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale gelöst. Durch das Vergießen im geschlossenen Zustand verhindert der Innendruck im Relais, daß Vergußmasse nach innen läuft und mit Bauteilen in Berührung kommt und so die Gebrauchsfähigkeit des Relais beeinträchtigt. In der Vergußmasse entstehende Luftkanäle konnten dabei nicht festgestellt werden. Durch die nach dem Angelieren oder Aushärten der Vergußmasse vorgenommene Öffnung der Wand der Gaseinfüllöffnung in der becherartigen Haube können die schädlichen Gase entweichen. Zusätzlich kann der Innenraum dann entgast und mit inertem Gas gespült oder gefüllt werden und dann das Lüftungsloch verschlossen werden. Die Öffnung der Haube ist dabei einfacher vorzunehmen als in einem Bodenteil, da die Haube beim Einlöten beispielsweise in eine gedruckte Schaltung nicht der hohen Temperatur ausgesetzt wird wie der Bodenteil und deshalb aus thermoplastischem Material bestehen kann.This object is achieved by the features specified in the characterizing part of claim 1. By potting in the closed state, the internal pressure in the relay prevents the potting compound from running inwards and coming into contact with components and thus impairing the usability of the relay. It was not possible to determine any air ducts that formed in the casting compound. The harmful gases can escape through the opening of the wall of the gas filling opening in the cup-like hood after the gelling compound has hardened or hardened. In addition, the interior can then be degassed and flushed or filled with inert gas and then the ventilation hole closed. The opening of the hood is easier to do than in a base part, since the hood is not exposed to the high temperature of the base part when soldering into a printed circuit, for example, and can therefore be made of thermoplastic material.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben und nachfolgend anhand eines in der Zeichnung veranschaulichten Ausführungsbeispieles beschrieben. Dabei zeigen :

  • Fig. 1 eine Seitenansicht einer Haube eines Relais mit dem angedeuteten, das Magnetsystem und das Kontaktsystem enthaltenden Gehäuseteil,
  • Fig. 2 die Haube von oben gemäß dem Schnitt A-B-C der Fig. 1, Fig. 3 eine Seitenansicht der Haube gemäß dem Schnitt D-E der Fig. 2,
  • Fig. 4 den Ausschnitt X der Fig. 3 in vergrößertem Maßstab und
  • Fig. 5 einen Verfahrensablaufplan.
Advantageous developments of the invention are specified in the subclaims and are described below with reference to an exemplary embodiment illustrated in the drawing. Show:
  • 1 is a side view of a hood of a relay with the indicated housing part containing the magnet system and the contact system,
  • 2 shows the hood from above according to section ABC of FIG. 1, FIG. 3 shows a side view of the hood according to section DE of FIG. 2,
  • Fig. 4 shows the detail X of FIG. 3 on an enlarged scale and
  • Fig. 5 shows a process flow chart.

In Fig. 1 ist mit 1 eine becherförmige Haube bezeichnet, in deren Oberseite 2 eine nach innen ragende trichterförmige, nach außen sich erweiternde Gaseinfüllöffnung 3 vorgesehen ist. Die Wand 4 der Gaseinfüllöffnung 3 ist zunächst verschlossen. Die Haube 1 ist zweckmäßigerweise ein Spritzguß- oder Preßteil aus Kunststoff. Die Seitenwände 5 erstrecken sich nach unten und reichen mit ihrer Endkante 6 bis zur Unterseite 7 eines Gehäusebodens 8 oder stehen sogar geringfügig über diese über. Der Gehäuseboden 8 ist Teil eines inneren Gehäuseunterteils, das das andeutungsweise gezeigte Magnetsystem 9 und das Kontaktsystem 10 (Fig. 5) sowie die Anschlußelemente 11 (Fig. 5) enthält.In Fig. 1, 1 designates a cup-shaped hood, in the top 2 of which an inwardly projecting funnel-shaped, outwardly widening gas filling opening 3 is provided. The wall 4 of the gas filling opening 3 is initially closed. The hood 1 is advantageously an injection molded or pressed part made of plastic. The side walls 5 extend downward and extend with their end edge 6 to the underside 7 of a housing base 8 or even protrude slightly above them. The housing base 8 is part of an inner housing lower part, which contains the magnet system 9 and the contact system 10 (FIG. 5) as well as the connection elements 11 (FIG. 5).

An den Haubeninnenseiten sind mehrere Rippen 12 vorgesehen, deren Enden 13 in zusammengebautem Zustand auf der Oberkante des Gehäuseunterteils oder dessen Seitenwänden aufliegen. Die Wand 4 der Gaseinfüllöffnung 3 kann durchstoßen werden, so daß ein Loch 14 entsteht (Fig. 3). Dieses Loch 14 wird nur so groß gemacht, daß eine zum anschließenden Verschließen eingefüllte Vergußmasse aufgrund der Kapillarwirkung und/oder der Oberflächenspannung und/oder der Viskosität nicht in das Gehäuse hineintropft. Vorzugsweise ist das Lüftungsloch 0,1 bis 0,8 mm im Durchmesser oder als Schlitz mit einer Schlitzbreite von 0,1 bis 0,6 mm ausgebildet.A plurality of ribs 12 are provided on the inside of the hood, the ends 13 of which, in the assembled state, rest on the upper edge of the lower housing part or its side walls. The wall 4 of the gas filling opening 3 can be pierced, so that a hole 14 is formed (Fig. 3). This hole 14 is only made so large that a potting compound filled in for subsequent sealing does not drip into the housing due to the capillary action and / or the surface tension and / or the viscosity. The ventilation hole is preferably 0.1 to 0.8 mm in diameter or a slot with a slot width of 0.1 to 0.6 mm.

Zweckmäßig ist die Innenseite der unteren Endkanten 6 der Hauben-Seitenwände 5 angefast (Fig. 4), damit von unten aufgebrachte Vergußmasse besser in den Trennschlitz 16 zwischen den Hauben-Seitenwänden 5 und dem Gehäuseboden 8 verlaufen kann.Advantageously, the inside of the lower end edges 6 of the hood side walls 5 is chamfered (FIG. 4), so that potting compound applied from below can run better into the separating slot 16 between the hood side walls 5 and the housing base 8.

Ein dichtes und auch bei sehr hoher Anzahl von Schaltzyklen noch einwandfrei arbeitendes Relais wird dadurch erhalten, daß das Relais zunächst zusammengebaut und die Haube 1 aufgeschoben wird (Fig. 5, Verfahrensabschnitt I). Hierauf wird das Relais so aufgestellt oder gehalten, daß die Oberseite 2 der Haube 1 nach unten zeigt (Fig. 5, Verfahrensabschnitt 11). In dieser Lage wird auf die Unterseite 7 des Gehäusebodens 8 eine selbsthärtende oder z. B. durch Energiezufuhr härtbare Vergußmasse 15 aufgebracht (Verfahrensabschnitt 111) und dann die Vergußmasse durch Energiezufuhr, insbesondere durch eine Wärmevorrichtung 17 oder Heißluft etc., angeliert oder ganz ausgehärtet. Darauf wird die Wand 4 der Einfüllöffnung 3 der Haube 1, beispielsweise mittels einer feinen Nadel, durchstoßen oder durchstochen und dadurch das Lüftungsloch 14 gebildet. Das Lüftungsloch 14 kann auch an einer der Seitenwände 5 der Haube 1 vorgesehen sein. Durch das Lüftungsloch 14 kann der Innenraum des Relais entgasen, wonach das Lüftungsloch 14 verschlossen wird oder der Innenraum wird vorher noch in einem besonderen Verfahrensabschnitt (Verfahrensabschnitt V) mit trockener Luft, Wasserstoff und/oder Inertgas durchgespült oder beispielsweise bei einem Unterdruck von bis zu 10-5 bar in einer Unterdruckkammer 18 entgast. Die Entgasung erfolgt vorzugsweise bei erhöhter Temperatur zwischen 130 und 180 °C bei Normallage des Relais. Hierbei entweichen aus den verwendeten Kunststoffen für den späteren Betrieb schädliche Bestandteile. Hieraus wird der Innenraum zweckmäßigerweise, vorzugsweise nach Abkühlung auf Normaltemperatur, mit einem inerten Gas, wie z. B. Helium, Argon oder Stickstoff, oder mit Wasserstoff oder getrockneter Luft gefüllt und anschließend in Normallage des Relais Vergußmasse 15 in die Einfüllöffnung 3 gebracht und diese danach ausgehärtet.A dense relay that works perfectly even with a very large number of switching cycles is obtained in that the relay is first assembled and the hood 1 is pushed on (FIG. 5, method section I). The relay is then set up or held so that the top 2 of the hood 1 points downwards (FIG. 5, method section 11). In this position, a self-curing or z. B. applied by energy supply curable potting compound 15 (process section 111) and then the potting compound by supplying energy, in particular by a heating device 17 or hot air, etc., gelled or fully cured. The wall 4 of the filling opening 3 of the hood 1 is then pierced or pierced, for example by means of a fine needle, and the ventilation hole 14 is thereby formed. The ventilation hole 14 can also on one of the Side walls 5 of the hood 1 may be provided. The interior of the relay can be degassed through the ventilation hole 14, after which the ventilation hole 14 is closed, or the interior is previously flushed with dry air, hydrogen and / or inert gas in a special process section (process section V) or, for example, at a negative pressure of up to 10 - Degassed 5 bar in a vacuum chamber 18. Degassing is preferably carried out at an elevated temperature between 130 and 180 ° C with the relay in the normal position. Harmful components escape from the plastics used for later operation. From this, the interior is expediently, preferably after cooling to normal temperature, with an inert gas, such as. B. helium, argon or nitrogen, or filled with hydrogen or dried air and then placed in the normal position of the relay potting compound 15 in the filler opening 3 and then cured.

Hierdurch erhält man ein vollkommen dichtes Relais mit sehr reinen Kontaktoberflächen und reiner, unschädlicher Innenatmosphäre, wodurch eine lange Lebensdauer auch bei hoher Schalthäufigkeit und sehr vielen, z. B. 106, Schaltzyklen erreicht wird.This gives you a completely sealed relay with very clean contact surfaces and a clean, harmless interior atmosphere, which ensures a long service life even with a high switching frequency and very many, e.g. B. 10 6 , switching cycles is achieved.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung wird zum Durchstoßen der Wand 4 der Einfüllöffnung 3, eine erhitzte Nadel verwendet. . Hierdurch muß kein großer Druck auf die Wandung ausgeübt werden, wenn das Wandungsmaterial aus einem thermoplastischen Kunststoff besteht.According to an advantageous embodiment of the invention, a heated needle is used to pierce the wall 4 of the filling opening 3. . As a result, no great pressure has to be exerted on the wall if the wall material consists of a thermoplastic.

Claims (7)

1. Method of sealing an electromagnetic relay having an aeratable interior space end a cup-like hood (1) extending down to the bottom (8) of a lower housing member accommodating the connecting elements (11) of the relay, which hood (1) is pushed onto said lower housing member after the relay components have been fitted, by applying a curing or settable sealing compound to the bottom surface of the lower housing member which is then facing upwards and a subsequent curing (setting) of the sealing compound, whereupon the interior space of the relay is filled with filling gas via a gas-filling aperture (3), after which the gas-filling aperture (3) is closed, characterized in that the gas-filling aperture (3) is formed in one of the outer surfaces of the cup-like hood (1), that this aperture (3) is at first closed by a wall (4) and that this wall (4) is not broken through for the purpose of filling with the gas until, at the earliest. after slight gelling of the sealing compound and turning of the relay into a position in which the gas filling aperture (3) faces upwards.
2. A method as claimed in Claim 1, characterized in that the relay is degassed at an underpressure before being filled with the filling gas.
3. A method as claimed in Claim 2. characterized in that the degassing is carried out at increased temperature.
4. A method as claimed in any one of Claims 2 or 3, characterized in that the degassing is carried out at a temperature between 130 and 180 C.
5. A method as claimed in any one of Claims 2 to 4, characterized in that the degassing is carried out at an underpressure down to 10-5 bar and that the relay is thereafter filled with an inert gas and/or dried air and/or hydrogen.
6. A method as claimed in any one of Claims 1 to 5, characterized in that, when the wall (4) of the gas filling aperture (3) is pierced, the hole formed is only made so large that, owing to the capillary effect and/or the surface tension, a filled-in sealing compound does not drip inwards.
7. A method as claimed in any one of Claims 1 to 6, characterized in that the wall (4) of the gas filling aperture (3) is pierced with a heated needle.
EP84102158A 1983-03-12 1984-03-01 Method of sealing a relay Expired EP0118841B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84102158T ATE32151T1 (en) 1983-03-12 1984-03-01 PROCEDURE FOR SEALING A RELAY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3308791 1983-03-12
DE3308791A DE3308791C2 (en) 1983-03-12 1983-03-12 Method of manufacturing a sealed electromagnetic relay

Publications (3)

Publication Number Publication Date
EP0118841A2 EP0118841A2 (en) 1984-09-19
EP0118841A3 EP0118841A3 (en) 1985-01-23
EP0118841B1 true EP0118841B1 (en) 1988-01-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84102158A Expired EP0118841B1 (en) 1983-03-12 1984-03-01 Method of sealing a relay

Country Status (7)

Country Link
US (1) US4675987A (en)
EP (1) EP0118841B1 (en)
JP (1) JPS59175528A (en)
AT (1) ATE32151T1 (en)
CA (1) CA1234462A (en)
DE (1) DE3308791C2 (en)
ES (1) ES8504406A1 (en)

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DE3045719A1 (en) * 1980-12-04 1982-07-08 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING CYCLOALIPHATIC AND / OR AROMATIC AMINES
JPS5797347U (en) * 1980-12-05 1982-06-15
DE3111311A1 (en) * 1981-03-23 1982-09-30 Siemens AG, 1000 Berlin und 8000 München Method for sealing electromechanical components
JPH017959Y2 (en) * 1981-05-06 1989-03-02

Also Published As

Publication number Publication date
US4675987A (en) 1987-06-30
JPH0572049B2 (en) 1993-10-08
DE3308791A1 (en) 1984-09-20
ES530501A0 (en) 1985-04-01
CA1234462A (en) 1988-03-29
ATE32151T1 (en) 1988-02-15
EP0118841A2 (en) 1984-09-19
JPS59175528A (en) 1984-10-04
ES8504406A1 (en) 1985-04-01
DE3308791C2 (en) 1986-08-21
EP0118841A3 (en) 1985-01-23

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