EP0550472B1 - Coaxial plug connector component for connection with a printed circuit board - Google Patents

Coaxial plug connector component for connection with a printed circuit board Download PDF

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Publication number
EP0550472B1
EP0550472B1 EP91915690A EP91915690A EP0550472B1 EP 0550472 B1 EP0550472 B1 EP 0550472B1 EP 91915690 A EP91915690 A EP 91915690A EP 91915690 A EP91915690 A EP 91915690A EP 0550472 B1 EP0550472 B1 EP 0550472B1
Authority
EP
European Patent Office
Prior art keywords
plug connector
circuit board
outer conductor
printed circuit
shielding sleeve
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
Application number
EP91915690A
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German (de)
French (fr)
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EP0550472A1 (en
Inventor
Michael Mussen
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.)
Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0550472A1 publication Critical patent/EP0550472A1/en
Application granted granted Critical
Publication of EP0550472B1 publication Critical patent/EP0550472B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
    • H01R24/38—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts
    • H01R24/40—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency
    • H01R24/50—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure having concentrically or coaxially arranged contacts specially adapted for high frequency mounted on a PCB [Printed Circuit Board]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2103/00—Two poles

Definitions

  • the invention relates to a coaxial connector element for connection to a printed circuit board, wherein a central connecting pin connected to an inner conductor and at least two peripheral connecting pins connected to a hollow cylindrical outer conductor are each provided with a press-in zone for fastening in one bore of the printed circuit board.
  • the object of the invention is therefore to develop a coaxial connector of the type mentioned in such a way that reliable high-frequency tightness is also achieved in the region of the press-in pins on the printed circuit board.
  • the shield sleeve has a first section with a greater wall thickness to form a larger end-face contact surface on the printed circuit board for the purpose of HF-tight shielding and a second section with a smaller wall thickness for overlapping contact with the outer conductor.
  • This second section can be split at least over part of its axial length into a plurality of resilient tabs for contacting the outer conductor.
  • the end face of the shielding sleeve facing outwards or towards the printed circuit board is expediently provided with coaxial webs or grooves. These bars provide reliable contact with the PCB coating and thus ensure high-frequency tightness.
  • This shield sleeve 10 has a first section 11 with a larger wall thickness and also a larger outside diameter. In this section 11, longitudinal grooves 12 are provided, with which the shield sleeve is guided on the peripheral connecting pins 7 with a press fit, but is displaceable.
  • the shield sleeve has a second section 13 with a smaller wall thickness, which has circumferential webs 14 and 15 for contacting the outer conductor 2. Towards the free end, this section 13 is further divided by slots 16 into a plurality of (in the example four) resilient tabs 17, whereby the contact with the outer conductor 2 is improved.
  • the shielding sleeve On the lower, that is to say the end face 18 facing the circuit board, the shielding sleeve also has concentric annular grooves 19 or ring webs 20, by means of which the contact with the circuit board is improved and the shielding is thus secured.
  • the structure of this end face 18 of the shield sleeve is shown in an enlarged detail in FIG. 4.
  • the connecting pins 5 and 7 are thus pressed into the corresponding bores 8a.
  • the shield sleeve 10 comes into contact with the circuit board surface.
  • the shield sleeve is pushed back in the axial direction, the second section 13 of the shield sleeve being pushed into the cavity 21 between the outer conductor 2 and a tubular insulation 22 as required.
  • the space between the circuit board on the one hand and the outer conductor 2 on the other hand is thus completely shielded against high-frequency radiation.

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  • Coupling Device And Connection With Printed Circuit (AREA)
  • Studio Devices (AREA)

Abstract

The coaxial plug connector component has a central push-in pin (5) and at least two peripheral push-in pins (7) for making a non-soldered contact between the inner (1) and outer (2) conductors on a printed circuit board (8). An additional protective sleeve (10) is arranged to move axially on the peripheral pins (7), the inner edge of which overlaps the outer conductor (2). When the plug connector component is pushed into the drillings in the printed circuit board, the protective sleeve is moved as needed and, regardless of the depth of insertion and the tolerances, provides good contact between the printed circuit board and the outer conductor (2), ensuring that the plug connection is reliably r.f.-proof.

Description

Die Erfindung betrifft ein Koaxial-Steckverbinderelement zur Verbindung mit einer Leiterplatte, wobei ein mit einem Innenleiter verbundener zentraler Anschlußstift und mindestens zwei mit einem hohlzylindrischen Außenleiter verbundene periphere Anschlußstifte jeweils mit einer Einpreßzone zur Befestigung in je einer Bohrung der Leiterplatte versehen sind.The invention relates to a coaxial connector element for connection to a printed circuit board, wherein a central connecting pin connected to an inner conductor and at least two peripheral connecting pins connected to a hollow cylindrical outer conductor are each provided with a press-in zone for fastening in one bore of the printed circuit board.

Ein Steckverbinderelement dieser Art mit Einpreßstiften ist in dem DE 89 07 785 U beschrieben. Durch die Einpreßstifte ist dort eine lötfreie Verbindung des Koaxial-Steckverbinders mit einer Leiterplattenverdrahtung möglich. Allerdings besteht dabei das Problem, daß im Bereich zwischen den peripheren Anschlußstiften eine Lücke in der Hochfrequenzabschirmung auftritt. Diese kann auch wegen der Toleranzen beim Einpressen in die Leiterplatte durch eine entsprechende Verlängerung des hohlzylindrischen Außenleiters nicht ganz geschlossen werden.A connector element of this type with press-in pins is described in DE 89 07 785 U. The press-in pins allow a solderless connection of the coaxial connector with a printed circuit board wiring. However, there is a problem that there is a gap in the high-frequency shielding in the area between the peripheral pins. Because of the tolerances when it is pressed into the printed circuit board, this cannot be completely closed by a corresponding extension of the hollow cylindrical outer conductor.

Aufgabe der Erfindung ist es deshalb, einen Koaxial-Steckverbinder der eingangs genannten Art so weiterzubilden, daß auch im Bereich der Einpreßstifte an der Leiterplatte eine zuverlässige Hochfrequenzdichtigkeit erreicht wird.The object of the invention is therefore to develop a coaxial connector of the type mentioned in such a way that reliable high-frequency tightness is also achieved in the region of the press-in pins on the printed circuit board.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß im Bereich zwischen den Einpreßzonen der Anschlußstifte und dem Auβenleiter eine Schirmhülse auf den peripheren Anschlußstiften in Axialrichtung verschiebbar gehalten ist, deren nach innen weisender Rand sich koaxial mit dem Außenleiter überlappt.According to the invention, this object is achieved in that in the area between the press-in zones of the connecting pins and the outer conductor, a shield sleeve is held on the peripheral connecting pins in an axially displaceable manner, the inward-facing edge of which overlaps coaxially with the outer conductor.

Durch die verschiebbare Schirmhülse wird bei der Erfindung erreicht, daß nach dem lötfreien Eindrücken der Anschlußstifte in die Bohrungen der Leiterplatte auf jeden Fall und unabhängig von der Größe der Toleranzen eine HF-dichte Abschirmung für den Innenleiter erreicht wird.The sliding shield sleeve is achieved in the invention that after the solderless pressing of the pins into the holes in the circuit board in any case and independently an RF-tight shield for the inner conductor is achieved based on the size of the tolerances.

Zweckmäßigerweise besitzt die Schirmhülse in ihrem Umfang achsparallele Längsnuten, in denen die peripheren Anschlußstifte mit Preßsitz verschiebbar geführt sind. Wie erwähnt, sind mindestens zwei periphere Anschlußstifte aus Symmetriegründen vorgesehen, auf denen über entsprechende zwei Längsnuten die Schirmhülse geführt werden kann. Natürlich können auch drei oder auch mehr derartige Anschlußstifte mit einer entsprechenden Anzahl von Nuten in der Schirmhülse vorgesehen werden.Expediently, the shield sleeve has axially parallel longitudinal grooves in its circumference, in which the peripheral connecting pins are slidably guided with a press fit. As mentioned, at least two peripheral connection pins are provided for reasons of symmetry, on which the shield sleeve can be guided via corresponding two longitudinal grooves. Of course, three or more such pins can also be provided with a corresponding number of grooves in the shield sleeve.

In einer zweckmäßigen Ausführungsform weist die Schirmhülse einen ersten Abschnitt mit größerer Wandstärke zur Bildung einer größeren stirnseitigen Anlagefläche an der Leiterplatte zum Zwecke der HF-dichten Abschirmung und einen zweiten Abschnitt mit kleinerer Wandstärke zur überlappenden Kontaktgabe mit dem Außenleiter auf. Dieser zweite Abschnitt kann zumindest über einen Teil seiner axialen Länge in mehrere federnde Lappen zur Kontaktierung mit dem Außenleiter aufgespalten sein. Grundsätzlich ist es möglich, den genannten zweiten Abschnitt der Schirmhülse so zu gestalten, daß er über die Außenseite des Außenleiters gesteckt wird. In einer bevorzugten Ausführungsform besitzt dieser zweite Abschnitt jedoch einen verringerten Durchmesser, so daß er in einen ringförmigen Hohlraum zwischen dem Außenleiter und dem Innenleiter bzw. einer den Innenleiter umgebenden Isolierung hineinragt.In an expedient embodiment, the shield sleeve has a first section with a greater wall thickness to form a larger end-face contact surface on the printed circuit board for the purpose of HF-tight shielding and a second section with a smaller wall thickness for overlapping contact with the outer conductor. This second section can be split at least over part of its axial length into a plurality of resilient tabs for contacting the outer conductor. Basically, it is possible to design the second section of the shielding sleeve so that it is inserted over the outside of the outer conductor. In a preferred embodiment, however, this second section has a reduced diameter, so that it projects into an annular cavity between the outer conductor and the inner conductor or an insulation surrounding the inner conductor.

Zur Vervollkommnung der HF-Dichtigkeit wird zweckmäßigerweise zusätzlich die nach außen bzw. zur Leiterplatte weisende Stirnfläche der Schirmhülse mit koaxialen Stegen bzw. Rillen versehen. Diese Stege geben einen zuverlässigen Kontakt mit der Leiterplattenbeschichtung und sichern damit die Hochfrequenzdichtigkeit.To perfect the HF tightness, the end face of the shielding sleeve facing outwards or towards the printed circuit board is expediently provided with coaxial webs or grooves. These bars provide reliable contact with the PCB coating and thus ensure high-frequency tightness.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel anhand der Zeichnung näher erläutert. Es zeigen

  • Figur 1 ein Koaxial-Steckverbinderelement, zur Hälfte geschnitten, in einer Leiterplatte,
  • Figur 2 eine Ansicht auf das Steckverbinderelement von Figur 1, von den Anschlußstiften her gesehen,
  • Figur 3 eine Schirmhülse aus Figur 1 in Seitenansicht bzw. im Schnitt,
  • Figur 4 ein Detail IV aus Figur 3 in vergrößerter Darstellung und
  • Figur 5 eine Ansicht V in Axialrichtung auf die Schirmhülse von Figur 3.
The invention is explained in more detail using an exemplary embodiment with reference to the drawing. Show it
  • FIG. 1 shows a coaxial connector element, cut in half, in a printed circuit board,
  • FIG. 2 shows a view of the connector element from FIG. 1, seen from the connecting pins,
  • FIG. 3 shows a shielding sleeve from FIG. 1 in side view or in section,
  • Figure 4 shows a detail IV of Figure 3 in an enlarged view
  • 5 shows a view V in the axial direction of the shielding sleeve from FIG. 3.

Das in Figur 1 und 2 dargestellte Steckverbinderelement besitzt einen Innenleiter 1 und einen Außenleiter 2, die beide durch eine rohrförmige Isolierung 3 getrennt und koaxial zueinander gehalten werden. Die oberen Enden la und 2a des Innenleiters 1 bzw. des Außenleiters 2 dienen in bekannter Weise zur Ankopplung eines komplementären Steckverbinderelementes, was hier nicht weiter beschrieben werden soll. Insoweit entspricht das dargestellte Steckverbinderelement dem herkömmlichen Aufbau.The connector element shown in Figures 1 and 2 has an inner conductor 1 and an outer conductor 2, both of which are separated by a tubular insulation 3 and held coaxially with each other. The upper ends la and 2a of the inner conductor 1 and the outer conductor 2 are used in a known manner for coupling a complementary connector element, which will not be described further here. In this respect, the connector element shown corresponds to the conventional structure.

Das untere Ende 1b des Innenleiters 1 besitzt eine Axialbohrung (nicht sichtbar), in welcher ein zentraler Anschlußstift 5 verankert ist. Außerdem besitzt der hohlzylinderförmige Außenleiter 2 zwei ebenfalls nicht gezeigte gegenüberliegende Längsbohrungen, in die zwei periphere Anschlußstifte 7 achsparallel eingesetzt sind. Diese Anschlußstifte 5 und 7 sind jeweils mit einer Einpreßzone 5a bzw. 7a versehen, womit sie durch Eindrükken in Kontaktbohrungen 8a einer Leiterplatte 8 lötfrei befestigt und kontaktiert werden können.The lower end 1b of the inner conductor 1 has an axial bore (not visible) in which a central connecting pin 5 is anchored. In addition, the hollow cylindrical outer conductor 2 has two opposite longitudinal bores, also not shown, into which two peripheral connecting pins 7 are inserted axially parallel. These pins 5 and 7 are each provided with a press-in zone 5a and 7a, respectively, with which they can be attached and contacted without soldering by pressing into contact bores 8a of a printed circuit board 8.

Um den Bereich zwischen dem unteren Ende 2b des Außenleiters und der Leiterplatte hochfrequenzdicht zu machen, ist eine zusätzliche Schirmhülse 10 vorgesehen, die anhand der Figuren 2 bis 5 noch näher erläutert werden soll. Diese Schirmhülse 10 besitzt einen ersten Abschnitt 11 mit größerer Wandstärke und auch größerem Außendurchmesser. In diesem Abschnitt 11 sind Längsnuten 12 vorgesehen, mit denen die Schirmhülse auf den peripheren Anschlußstiften 7 mit Preßsitz, jedoch verschiebbar, geführt wird.In order to make the area between the lower end 2b of the outer conductor and the printed circuit board radio-frequency-tight, an additional shield sleeve 10 is provided, which is shown in FIGS to 5 will be explained in more detail. This shield sleeve 10 has a first section 11 with a larger wall thickness and also a larger outside diameter. In this section 11, longitudinal grooves 12 are provided, with which the shield sleeve is guided on the peripheral connecting pins 7 with a press fit, but is displaceable.

Weiterhin besitzt die Schirmhülse einen zweiten Abschnitt 13 mit geringerer Wandstärke, welcher zur Kontaktierung mit dem Außenleiter 2 umlaufende Stege 14 und 15 aufweist. Zum freien Ende hin ist dieser Abschnitt 13 außerdem durch Schlitze 16 in mehrere (im Beispiel vier) federnde Lappen 17 unterteilt, wodurch der Kontakt mit dem Außenleiter 2 verbessert wird.Furthermore, the shield sleeve has a second section 13 with a smaller wall thickness, which has circumferential webs 14 and 15 for contacting the outer conductor 2. Towards the free end, this section 13 is further divided by slots 16 into a plurality of (in the example four) resilient tabs 17, whereby the contact with the outer conductor 2 is improved.

An der unteren, also der der Leiterplatte zugewandten Stirnseite 18 besitzt die Schirmhülse außerdem konzentrische Ringnuten 19 bzw. Ringstege 20, durch die der Kontakt mit der Leiterplatte verbessert und somit die Abschirmung gesichert wird. Die Struktur dieser Stirnseite 18 der Schirmhulse ist in einer vergrößerten Ausschnittsdarstellung in Figur 4 gezeigt.On the lower, that is to say the end face 18 facing the circuit board, the shielding sleeve also has concentric annular grooves 19 or ring webs 20, by means of which the contact with the circuit board is improved and the shielding is thus secured. The structure of this end face 18 of the shield sleeve is shown in an enlarged detail in FIG. 4.

Beim Einsetzen des Steckverbinderelementes in eine Leiterplatte werden somit die Anschlußstifte 5 und 7 in die entsprechenden Bohrungen 8a eingedrückt. Dabei kommt die Schirmhülse 10 in Kontakt mit der Leiterplattenoberfläche. Bei weiterem Eindrükken wird die Schirmhülse in Axialrichtung zurückgedrückt, wobei der zweite Abschnitt 13 der Schirmhülse in den Hohlraum 21 zwischen dem Außenleiter 2 und einer rohrförmigen Isolierung 22 nach Bedarf eingeschoben wird. Nach dem Eindrücken ist somit der Raum zwischen der Leiterplatte einerseits und dem Außenleiter 2 andererseits vollständig gegen Hochfrequenzstrahlung abgeschirmt.When the connector element is inserted into a printed circuit board, the connecting pins 5 and 7 are thus pressed into the corresponding bores 8a. The shield sleeve 10 comes into contact with the circuit board surface. Upon further pushing in, the shield sleeve is pushed back in the axial direction, the second section 13 of the shield sleeve being pushed into the cavity 21 between the outer conductor 2 and a tubular insulation 22 as required. After being pressed in, the space between the circuit board on the one hand and the outer conductor 2 on the other hand is thus completely shielded against high-frequency radiation.

Claims (6)

  1. Coaxial plug connector element for connection to a printed circuit board (8), a central connecting pin (5), which is connected to an inner conductor (1), and at least two peripheral connecting pins (7), which are connected to a hollow-cylindrical outer conductor (2), in each case being provided with a push-in zone (5a, 7a) for attachment to in each case one hole (8a) in the printed circuit board (8), characterised in that a shielding sleeve (10) is held on the peripheral connecting pins (7), in the region between the push-in zones (7a) of the connecting pins (7) and the outer conductor (2), such that it can move in the axial direction, the inwardly pointing edge section (13) of which shielding sleeve overlaps the outer conductor (2) coaxially.
  2. Plug connector element according to Claim 1, characterised in that the shielding sleeve (10) has longitudinal grooves (12) in its circumference which are parallel to the axis and in which the peripheral connecting pins (7) are guided with a push fit, such that they can move.
  3. Plug connector component according to either of Claims 1 and 2, characterised in that the shielding sleeve (10) has a first section (11) with a greater wall thickness in order to form a larger end contact surface, and a second section (13) with a smaller wall thickness in order to make overlapping contact with the outer conductor (2).
  4. Plug connector component according to Claim 3, characterised in that the second section (13) of the shielding sleeve (10) is split at least over a part of its axial length into a plurality of sprung flaps (17) in order to make contact with the outer conductor (2).
  5. Plug connector component according to Claim 3 or 4, characterised in that the second section (13) of the shielding sleeve (10) projects into an annular cavity (21) between the outer conductor (2) and the inner conductor (1), or insulation (22) surrounding the inner conductor.
  6. Plug connector component according to one of Claims 1 to 5, characterised in that the end surface (18) of the shielding sleeve (10) pointing outwards or towards the printed circuit board is provided with coaxial webs (20) or splines (19).
EP91915690A 1990-09-24 1991-09-04 Coaxial plug connector component for connection with a printed circuit board Expired - Lifetime EP0550472B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4030210 1990-09-24
DE4030210 1990-09-24
PCT/DE1991/000698 WO1992005606A1 (en) 1990-09-24 1991-09-04 Coaxial plug connector component for connection with a printed circuit board

Publications (2)

Publication Number Publication Date
EP0550472A1 EP0550472A1 (en) 1993-07-14
EP0550472B1 true EP0550472B1 (en) 1995-01-11

Family

ID=6414875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91915690A Expired - Lifetime EP0550472B1 (en) 1990-09-24 1991-09-04 Coaxial plug connector component for connection with a printed circuit board

Country Status (8)

Country Link
US (1) US5580276A (en)
EP (1) EP0550472B1 (en)
JP (1) JPH0732043B2 (en)
AU (1) AU662887B2 (en)
DE (1) DE59104268D1 (en)
DK (1) DK0550472T3 (en)
ES (1) ES2066467T3 (en)
WO (1) WO1992005606A1 (en)

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CH690531A5 (en) * 1994-03-10 2000-09-29 Reichle & De Massari Fa Device for connecting shielded conductors in telephony and data communication.
JPH1197118A (en) * 1997-09-16 1999-04-09 Yazaki Corp Shield wire connecting structure and processing method
US6079986A (en) * 1998-02-07 2000-06-27 Berg Technology, Inc. Stacking coaxial connector for three printed circuit boards
DE19853775C2 (en) * 1998-11-21 2003-05-08 Wuerth Elektronik Gmbh & Co Kg receptacle
TW555194U (en) * 2002-11-29 2003-09-21 Hon Hai Prec Ind Co Ltd Electrical connector
DE10259803B3 (en) * 2002-12-19 2004-05-13 Kathrein-Werke Kg Electrical termination connection for outer conductor of coaxial cable has plug part with 2 plug sections fitting into housing wall opening with 2 reception sections
US7789703B2 (en) * 2008-10-21 2010-09-07 Tyco Electronics Corporation Connector having a shield electrically coupled to a cable shield
JP6439555B2 (en) * 2015-04-06 2018-12-19 富士通株式会社 Coaxial connector
US9461383B1 (en) 2015-09-28 2016-10-04 Amphenol Corporation High signal isolation electrical connector
US10958000B2 (en) 2016-01-15 2021-03-23 Ppc Broadband, Inc. Printboard contact grip
EP3403299B1 (en) 2016-01-15 2021-03-10 PPC Broadband, Inc. Printed circuit board connector
DE102018210234B3 (en) 2018-06-22 2019-09-19 Würth Elektronik eiSos Gmbh & Co. KG Contact for direct plug-in connection and direct plug-in connection
JP7222867B2 (en) * 2019-10-09 2023-02-15 ヒロセ電機株式会社 High-frequency element and high-frequency band device having the high-frequency element
CN213753347U (en) * 2021-01-15 2021-07-20 刘蓓林 Welding-free radio frequency connector

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US4412717A (en) * 1982-06-21 1983-11-01 Amp Incorporated Coaxial connector plug
US4588241A (en) * 1983-09-23 1986-05-13 Probe-Rite, Inc. Surface mating coaxial connector
US4718854A (en) * 1986-12-18 1988-01-12 Amp Incorporated Low profile press fit connector
US4795352A (en) * 1988-02-01 1989-01-03 Amp Incorporated Microcoaxial connector family
DE8806100U1 (en) * 1988-05-07 1988-06-30 Standard Elektrik Lorenz AG, 70435 Stuttgart Miniature plug-in coupling for coaxial cables
DE8907785U1 (en) * 1989-06-26 1989-08-24 Siemens AG, 1000 Berlin und 8000 München Coaxial connector half or high current contact connectable to a printed circuit board

Also Published As

Publication number Publication date
US5580276A (en) 1996-12-03
AU662887B2 (en) 1995-09-21
ES2066467T3 (en) 1995-03-01
JPH0732043B2 (en) 1995-04-10
DK0550472T3 (en) 1995-05-01
JPH05506745A (en) 1993-09-30
DE59104268D1 (en) 1995-02-23
EP0550472A1 (en) 1993-07-14
WO1992005606A1 (en) 1992-04-02
AU8402791A (en) 1992-04-15

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