WO2007062866A1 - Intermediate plug - Google Patents

Intermediate plug Download PDF

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Publication number
WO2007062866A1
WO2007062866A1 PCT/EP2006/011562 EP2006011562W WO2007062866A1 WO 2007062866 A1 WO2007062866 A1 WO 2007062866A1 EP 2006011562 W EP2006011562 W EP 2006011562W WO 2007062866 A1 WO2007062866 A1 WO 2007062866A1
Authority
WO
WIPO (PCT)
Prior art keywords
intermediate plug
printed circuit
circuit board
plug
contact
Prior art date
Application number
PCT/EP2006/011562
Other languages
French (fr)
Inventor
Rudolf Kraemer
Werner Tille
Original Assignee
Tyco Electronics Amp Gmbh
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 Tyco Electronics Amp Gmbh filed Critical Tyco Electronics Amp Gmbh
Publication of WO2007062866A1 publication Critical patent/WO2007062866A1/en

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70Coupling devices
    • H01R12/71Coupling devices for rigid printing circuits or like structures
    • H01R12/72Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures
    • H01R12/721Coupling devices for rigid printing circuits or like structures coupling with the edge of the rigid printed circuits or like structures cooperating directly with the edge of the rigid printed circuits
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02Contact members
    • H01R13/03Contact members characterised by the material, e.g. plating, or coating materials
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R31/00Coupling parts supported only by co-operation with counterpart
    • H01R31/06Intermediate parts for linking two coupling parts, e.g. adapter

Definitions

  • the invention is related to an electrical connector and more particularly to an intermediate plug for electrically connecting a printed circuit board to a mating plug.
  • An electrical plug for electrical contacting of printed circuit boards is known from US 5 160 275.
  • the plug has a resilient arm, which, when the plug is plugged onto a printed circuit board, moves resiliently away from it, so that electrical contacts of the plug are also moved away from the printed circuit board.
  • the resilient arm resumes its original configuration when the plug is plugged in its intended position on the printed circuit board, so that the electrical contacts of the plug can contact traces of the printed circuit board.
  • Intermediate plugs which achieve electrical connection to printed circuit board pads by means of penetration contacts are also known from the prior art. These intermediate plugs have a comparatively greater space requirement and a large overhang on the printed circuit board. In particular, the printed circuit board becomes several times thicker in an edge region, which in unfavorable circumstances increases the volume of the whole electrical device in which it is used.
  • An object of the invention is to make an improved intermediate plug.
  • the intermediate plug should make direct gold-plating of the printed circuit board unnecessary, and for instance for portable electronic devices, the intermediate plug should take as little space as possible on the printed circuit board.
  • an intermediate plug for printed circuit boards the intermediate plug according to the invention being of planar, elongate construction can be fixed on a printed circuit board.
  • the intermediate plug has electrical contacts which are plugged into a housing, and which are preferably in one part and of elongate form.
  • the electrical contacts have two contact areas, a first contact area being in a form for electrical connection to printed circuit board pads and a second contact area being in a form for electrical connection to contacts of a mating plug.
  • the second contact areas of the electrical contacts each form outer areas of the intermediate plug, which outer areas are visible without aid, and can be contacted directly from outside by the mating plug with its internal electrical contacts.
  • the intermediate plug in an exemplary embodiment of the invention When plugged into the printed circuit board, the intermediate plug in an exemplary embodiment of the invention is connected electrically to the printed circuit board only on the outside. That is, the first contact areas abut on the pads only externally, and contact them electrically only from the outside. Penetration contacts, used generally for fixing the plug therefore become unnecessary.
  • the electrical contacts of the intermediate plug are soldered, pressed or clamped to the printed circuit board. Before final fixing to the pads, the electrical contacts can abut on the pads or printed circuit board with pretensioning.
  • electrical connection to the printed circuit board is no longer effected by direct contacting of the pads by means of a direct or mating plug, but via the intermediate plug, which may be in the form of an adapter plug. Therefore, for electrical connection to the printed circuit board, no resilient contacts of the mating plug act on the pads. According to the invention, the resilient contacts of the mating plug each contact a contact area of the electrical contact of the intermediate plug.
  • the intermediate plug on the printed circuit board makes direct gold- plating of the pads or trace end portions unnecessary, because the contacting positions of the intermediate plug with the printed circuit board can be designed accordingly. This can be achieved, for instance, by soldering, clamping and/or appropriate dimensioning of the contact areas.
  • the electrical contacting positions no longer have to be designed for the least favorable case of a mating plug which has not been plugged in properly, since the intermediate plug is preferably rigidly connected to the printed circuit board and is correspondingly pre-assembled when the module is fitted.
  • the electrical contacts of the intermediate plug are metallized with precious metal at least at the (subsequent) contacting positions with the printed circuit board. Gold-plating or silver-plating is preferred. Such a precious metal coating of the first contact areas is advantageous to ensure reliability through a large number of insertion/withdrawal or mating cycles and low contact resistances.
  • Silver-plating or gold-plating of the electrical contacts is - despite the additional cost of the intermediate plug and of fitting it - significantly less expensive than the requirement for gold-plated or silver-plated printed circuit board pads.
  • tin-plated pads can be used.
  • the electrical contacts can also be designed without silver-plating or gold-plating of the contact areas, which is particularly advantageous together with correspondingly rounded first contact areas, since in this way, in the case of frequent mating cycles, abrasion on the printed circuit board is minimized.
  • a single electrical contact of the intermediate plug is in the form of an elongate, one-piece resilient contact.
  • one longitudinal end portion of the electrical contact forms the first contact area
  • an opposite longitudinal end portion forms the second contact area.
  • the first contact area contacts the printed circuit board, whereas the second contact area can be contacted by the mating plug.
  • the two contact areas are preferably on two surface sides of the electrical contact, substantially facing diametrically away from each other.
  • the first contact area is preferably rounded, and the second contact area is preferably in a planar, lamellar form.
  • the intermediate plug as a whole can be in a planar form with a small volume.
  • a large number of electrical contacts are received in the housing of the intermediate plug, the first contact areas of the respective electrical contacts projecting out of the housing of the intermediate plug.
  • two such first contact areas are opposite each other with reference to a longitudinal axis of the intermediate plug, and between these two first contact areas, the printed circuit board can be received or clamped.
  • the housing of the intermediate plug in one embodiment of the invention has a recess starting from the outside, and the printed circuit board can be received at least in part in this recess.
  • the intermediate plug has a preferably lamellar recess starting from the outside in the region of the second contact areas of the electrical contacts, so that the mating plug can contact the second contact areas electrically.
  • two rows of electrical contacts are provided in the intermediate plug, and are arranged parallel to each other.
  • This configuration makes a particularly planar form of the intermediate plug possible simultaneously with a large number of electrical contacts, so that the intermediate plug takes only insignificantly more space than the corresponding printed circuit board.
  • the portion with the second contact areas of the intermediate plug is configured similarly or identically to a printed circuit board, so that by means of conventional direct plugs, which can otherwise be plugged into printed circuit boards, the intermediate plug according to the invention can be electrically contacted.
  • the intermediate plug is constructed identically in certain portions or areas, and there is an electrical contact in each of these areas.
  • the electrical contacts are selectively gold-plated, preferably in their first contact area.
  • the intermediate plug is placed or plugged onto the printed circuit board, and permanently fixed to the printed circuit board by an SMD or reflow soldering method.
  • SMD serial metal-oxide-semiconductor
  • reflow soldering method Other embodiments with a removable intermediate plug are of course possible.
  • Fig. 1 shows a three-dimensional exploded view of a first embodiment of an intermediate plug according to the invention
  • Fig. 2 shows a three-dimensional view of the completely assembled intermediate plug from Fig. 1 ;
  • Fig. 3 shows the first embodiment of the intermediate plug when assembled with a printed circuit board, and mated with a mating plug
  • Fig. 4 shows a three-dimensional exploded view of a second embodiment of the intermediate plug according to the invention
  • Fig. 5 shows a three-dimensional view of the completely assembled intermediate plug from Fig. 4;
  • Fig. 6 shows a cross-section view along a plane A-A of Fig. 5;
  • Fig. 7 shows the second embodiment according to Fig. 4 of the intermediate plug in the "assembled with the printed circuit board” state, and mated with a mating plug;
  • Fig. 8 shows a three-dimensional exploded view of a third embodiment of the intermediate plug according to the invention.
  • Fig. 9 shows a side view of the intermediate plug from Fig. 8 when assembled with the printed circuit board.
  • Fig. 10 shows a cross-section along a plane B-B of Fig. 9.
  • FIG. 1 A first embodiment of an intermediate plug 100 according to the invention is shown in Figs. 1, 2 and 3.
  • the intermediate plug 100 is substantially in the form of an elongate cuboid.
  • electrical contacts 120 are provided in a housing 110 of the intermediate plug 100 in the example illustrated.
  • any number, preferably an even number, of electrical contacts 120 can be provided in the intermediate plug 100.
  • the electrical contacts 120 are preferably arranged in pairs in the longitudinal direction, at equal distances from each other. That is, the distances in the longitudinal direction of the intermediate plug 100 between the individual pairs of electrical contacts 120 are the same in each case, and the distances between the two electrical contacts 120 of a pair are also the same for all pairs.
  • the housing 110 has a preferably central, cuboidal recess 130, in which a portion of a printed circuit board 200 (see Fig. 3, and for a second embodiment of the invention Fig. 7) can be received. That is, at least in certain portions (see, in particular, the second embodiment of the invention) the housing 110 is in the form of a hollow cuboid, and open on a longitudinal side. In the region of the recess 130, the housing 110 is preferably in the form of a peripheral frame.
  • a single electrical contact 120 is in an elongate, one-piece form, and has two contact areas 122, 124.
  • the first contact area 122 is convex, spherical, arched or partly cylindrical in form, whereas the second contact area 124 is substantially planar, stretched- out and lamellar.
  • the electrical contact 120 can have locking elements such as projections or recesses, by which it can be locked into recesses or projections in the housing 110.
  • the electrical contact 120 can also be clamped in the housing 110.
  • the electrical contacts 120 are plugged into the housing 110 of the intermediate plug 100 in such a way that the first contact areas 122 protrude from the housing 110, and the second contact areas 124 are carried on the housing 110.
  • the housing 110 has a recess starting from the outside in the regions of each of the second contact areas 124. Such a recess extends along each second contact area 124, and exposes a central portion of the second contact area 124.
  • the two longitudinal edges of the second contact area 124 are preferably covered by the housing 110, so that the second contact area 124 cannot move away or release itself from the housing 110.
  • the second contact areas 124 do not extend to a longitudinal side or transverse end of the intermediate plug 100, but leave some space to it. This can easily be seen in Fig. 2, in which above the second contact areas 124, only housing material can be seen.
  • the recesses in the housing 110 for the second contact areas 124 preferably extend to the corresponding longitudinal side or transverse end of the intermediate plug 100 (above in Fig. 2). Oppositely (below on the intermediate plug 100 of Fig. 2), this recess does not extend to the limit of the housing 110.
  • a housing bar 150 behind which the electrical contact 120 can be plugged into the housing 110, is provided. This bar 150 also delimits a recess 140 for the electrical contact 120, and for instance the electrical contact 120 can be clamped into it.
  • the longitudinal edge of the second contact area 124 concludes flush with the housing portion which adjoins it in the direction of the longitudinal side (see also similar section A-A in Fig. 6). hi another embodiment, this end can also project somewhat from this housing portion; preferably, in this case too, the second contact area 124 is angled or given a bevel, to make plugging in of a mating plug 300 easier.
  • the electrical contacts 120 are shown here in the form of a resilient contacts 120.
  • the resilient contacts 120 are in one piece and stamped or formed out of suitable sheet metal, e.g. spring steel sheet.
  • the resilient contacts 120 may be tin-plated on all sides, and additionally or instead can be provided at least in part with a precious metal coating.
  • This precious metal coating is may be, for example, gold-plating or silver-plating.
  • the precious metal coating if it exists, is preferably at least on the first contact area 124 of the intermediate plug 100. However, additionally or instead, the second contact area 122 of the intermediate plug 100 can correspondingly be given the precious metal coating.
  • the resilient contacts 120 can be provided completely with the precious metal coating. The extent to which such partial gold-plating or silver-plating is necessary depends on the field in which the intermediate plug 100 is later used.
  • Each resilient contact 120 is in such a form that its contact areas 122, 124 are provided at two longitudinal end portions of the resilient contact 120 facing away from each other.
  • the resilient contact 120 is first guided by a peripheral housing portion, which on one side is formed by the housing bar 150.
  • the resilient contact 120 moves forward into the housing 110, it slides along an outward opening portion of the housing 110, but abutting on a housing portion internally, until its final position. In the final position, the resilient contact 120 with its longitudinal edges abuts on a partly peripheral wall of the housing 110.
  • this housing portion can also be omitted to save space, in which case the longitudinal edges of the resilient contact 120 are guided in grooves or an edge in the transverse direction in the housing 110.
  • Fig. 3 shows the intermediate plug 100 according to the invention in the fitted state, with a printed circuit board 200, the intermediate plug 100 being plugged onto the printed circuit board 200.
  • the resilient contacts 120 contact electrical terminals 210 of the printed circuit board 200.
  • the electrical terminals 210 can be, for instance, contact pads or traces of the printed circuit board 200; in the drawings, these electrical terminals 210 are contact pads 210.
  • the resilient contacts 120 contact the electrical terminals 210 on the outside 220 of the printed circuit board 200.
  • the printed circuit board 200 is contacted on two opposite sides 220.
  • Contact pads 210 opposite each other can be either connected to each other electrically and materially in one piece, or not connected to each other electrically, so that in the case of the latter embodiment different electrical signals can be tapped at two resilient contacts 120 opposite each other.
  • the printed circuit board 200 is received in part in the recess 130 of the intermediate plug 100.
  • the resilient contacts 120 can abut on the contact pads 210, with or without pretensioning. If the first contact areas 122 do not abut on the contact pads 210 with pretensioning, a pretensioning force is applied to the first contact areas 122, preferably via the mating plug 300 when it is plugged onto the intermediate plug 100. Additionally, in the case of resilient contacts 120 which are or are not under pretensioning, the resilient contacts 120 or their first contact areas 122 can be soldered, pressed or clamped to the pads 210. If they are soldered to the pads 210, this is preferably effected by an SMD or reflow soldering method.
  • the thickness dimension of the recess 130 for the printed circuit board 200 is preferably exactly as great as that of the printed circuit board 200 in the corresponding region.
  • the recess 130 can also be thicker or, for a specific clamping effect, thinner. This also applies analogously to the length dimension.
  • intermediate plugs 100 which will later be adjacent to each other and can be plugged together onto the printed circuit board 200.
  • the result can be that the intermediate plug 100 is not closed at one or both longitudinal ends (not shown in the drawings).
  • the printed circuit board 200 is electrically connected or electrically contacted by the mating plug 300 via the intermediate plug 100, the mating plug 300 being plugged onto the intermediate plug 100 which is on the printed circuit board 200.
  • Each electrical contact of the mating plug 300 contacts a second contact area 124 of the intermediate plug 100.
  • the second contact area 124 is electrically connected to the first contact area 122, which is itself in electrical contact with an electrical terminal 210 of the printed circuit board 200.
  • the first embodiment of the intermediate plug 100 according to the invention is only slightly larger than the printed circuit board 200 in the region in which the intermediate plug 100 is plugged onto the printed circuit board 200.
  • one longitudinal end of the intermediate plug 100 concludes flush with the printed circuit board 200. This is preferably implemented via a recess 230 to a peripheral side edge of the printed circuit board 200.
  • keying recesses/projections corresponding to each other can be provided. This also applies analogously to the mating plug 300 with the intermediate plug 100.
  • FIG. 6 shows a cross- section A-A of the second embodiment of the intermediate plug 100.
  • the housing 110 is modified.
  • the recess 130 is at least partly replaced by a fixed, solid wall 160, this wall 160, together with the second contact areas 124 which abut on it, having overall a thinner form than the first embodiment with the hollow space 130 and second contact areas 124.
  • the second contact areas 124 of the resilient contacts 120 guidance of the second contact areas 124 of the resilient contacts 120 by an external wall, which partly overlaps the second contact areas 124, of the housing 110, is omitted; but this is optional.
  • the resilient contacts 120 are plugged into the housing 110, they are not guided on all sides, but mainly held in the recess 140 by two parallel housing portions.
  • the housing portions preferably have a mutual overlap, in which there is an S -shaped transition portion of the resilient contacts 120, which connects the first 122 to the second contact area 124. At the sides, the resilient contacts 120 are guided by a housing projection.
  • the resilient contacts 120 of the second embodiment is likewise modified.
  • the first contact area 122 and second contact area 124 of the same resilient contacts 120 are on the same level; i.e. among other things the gap between two directly opposed first contact areas 122 is the same as between two directly opposed second contact areas 124.
  • This is implemented by a U-shaped portion of the resilient contacts 120, one leg of which is the S-shaped transition portion. This is necessary so that a mating plug which can be plugged onto a printed circuit board 200 can also be plugged onto the intermediate plug 100.
  • the final position of the resilient contacts 120 can easily be seen in the section A- A of Fig. 6.
  • the resilient contacts 120 are supported on the central internal wall 160 of the housing 110 with a side opposite the second contact area 124.
  • the resilient contacts 120 are additionally supported on an inner side of an external wall of the housing 110.
  • the resilient contacts 120 are clamped between the inner side and the central internal wall 160, so that the resilient contacts 120 are locked in the housing 110. This can be supported by locking elements in/on the housing 110 and on/in the resilient contacts 120.
  • the intermediate plug 100 can also be locked on the printed circuit board 200 by means of locking projections 112, which can engage with corresponding locking recesses in the printed circuit board 200.
  • locking projections 112 can engage with corresponding locking recesses in the printed circuit board 200.
  • a statically reversed variant with a locking recess 114 in the intermediate plug 100 and a corresponding locking projection on the printed circuit board 200 is of course possible. This also applies to the first embodiment of the invention, although in this case the locking means are not shown in Figs. 1 - 3.
  • the dimensions of the intermediate plug 100 in the regions in which the mating plug 300 can be plugged are preferably exactly the same as those of the printed circuit board 200 in the corresponding region. This applies, in particular, to the gap between two directly opposed second contact areas 124. In this way, it is possible to contact a mating plug 300 which is actually to be plugged onto a printed circuit board 200 electrically via the intermediate plug 100 with the printed circuit board 200.
  • the first contact area 122 of each individual resilient contacts 120 is preferably in a plane which is spanned by the appropriate second contact area 124 (see also Fig. 6, section A-A).
  • the housing 110 of the intermediate plug 100 is preferably reinforced, but in this case housing portions which adjoin the second contact areas 124 directly are preferably in alignment with the second contact areas 124. Between two such housing portions in alignment, preferably a reinforcing bar is provided, and preferably in turn is in alignment with the guide bar 150 for the resilient contacts 120, and/or with an external wall of the intermediate plug 100.
  • Fig. 7 shows the intermediate plug 100 fitted on the printed circuit board 200, the first contact areas 122 in turn contacting the pads 210 on the outside 220 of the printed circuit board 200 electrically.
  • a portion, which can be received by the housing 110, of the printed circuit board 200 has a shorter form. This portion no longer - as in the case of the first embodiment of the invention - dips almost as deeply as a transverse end of the intermediate plug 100, but only a short way, that is approximately to the start of the second contact area 124. That is, the recess 130 for the printed circuit board 200 extends approximately to the S-shaped transition portion of the resilient contacts 120 (see Fig. 6, section A-A). In the case of such an embodiment, soldering the first contact areas 122 to the pads 210 is preferred, for reasons of stability.
  • the second embodiment of the intermediate plug 100 according to the invention is constructed analogously to the first embodiment of the invention.
  • Figs. 8 - 10 show a third embodiment of the intermediate plug 100 according to the invention.
  • the housing 110 of the intermediate plug 100 is divided into two, the two halves being preferably constructed identically.
  • the intermediate plug 100 is divided longitudinally, and in the assembled state has an analogous configuration to the second embodiment of the invention.
  • One or both housing halves of the intermediate plug 100 preferably have, on an inner side of the intermediate plug 100, two centring pins 180 for correctly oriented positioning of the intermediate plug 100 on the printed circuit board 200.
  • the inner side also preferably has two recesses 190 for two supporting pins 240 of the printed circuit board 200, so that the intermediate plug 100 can be securely fitted to the printed circuit board 200 and is secured against kinking or slipping down.
  • only one or multiple centring pins 180 and recesses 190 can be provided.
  • a short printed circuit board portion is received in the recess 130.
  • the recess 130 can also be omitted.
  • the one-part housing configuration of the second embodiment of the invention with a recess 190 for a supporting journal 240, and even with a centring pin 180, which in this case snaps into the printed circuit board 200.
  • each housing half has, for instance, a locking recess and a corresponding locking projection, and these can engage with each other in a position rotated by 180°.
  • the two halves can also be glued to each other.
  • the intermediate plug 100 consists of only one housing half.
  • This one-part intermediate plug 100 according to the third embodiment is suitable for printed circuit boards which have pads only on an outer side 220.
  • the first contact areas 122 are soldered to the pads 210.
  • the third embodiment of the intermediate plug 100 according to the invention is constructed analogously to the first and second embodiments of the invention.

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  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

The invention concerns an intermediate plug for electrical contacting of a printed circuit board (200) with a mating plug (300), wherein a first contact area of an electrical contact (120) of the intermediate plug (100) can be connected electrically to an electrical terminal (210) of the printed circuit board (200), and a second contact area of the electrical contact (120) can be connected electrically to the mating plug (300), and the second contact area of the electrical contact (120) forms a portion of an outer boundary of the intermediate plug (100). The invention also concerns an electronic module with the intermediate plug (100) and a printed circuit board, the intermediate plug (100) being soldered and/or pressed and/or clamped to the printed circuit board.

Description

INTERMEDIATE PLUG
The invention is related to an electrical connector and more particularly to an intermediate plug for electrically connecting a printed circuit board to a mating plug.
The requirements for electrically connecting a printed circuit board are high. On the one hand, once the electrical connection to traces and/or pads of the printed circuit board has been made, it should be made to last, and on the other hand it should be possible to release such electrical connection, so that a different electrical device can be connected to the printed circuit board.
To ensure high insertion/withdrawal rates and low contact resistances, silver- plating or gold-plating of the traces and pads is necessary. However, such silver-plating or gold-plating of areas of the printed circuit board is expensive. Also, the electrical connections to the traces and pads should require little space, so that the dimensions of the corresponding devices are not too great, which applies in particular to portable or mobile devices.
In the following description, only pads are mentioned, but what is said should apply analogously to traces of a printed circuit board.
An electrical plug for electrical contacting of printed circuit boards is known from US 5 160 275. The plug has a resilient arm, which, when the plug is plugged onto a printed circuit board, moves resiliently away from it, so that electrical contacts of the plug are also moved away from the printed circuit board. The resilient arm resumes its original configuration when the plug is plugged in its intended position on the printed circuit board, so that the electrical contacts of the plug can contact traces of the printed circuit board.
Intermediate plugs which achieve electrical connection to printed circuit board pads by means of penetration contacts are also known from the prior art. These intermediate plugs have a comparatively greater space requirement and a large overhang on the printed circuit board. In particular, the printed circuit board becomes several times thicker in an edge region, which in unfavorable circumstances increases the volume of the whole electrical device in which it is used. An object of the invention is to make an improved intermediate plug. In particular, the intermediate plug should make direct gold-plating of the printed circuit board unnecessary, and for instance for portable electronic devices, the intermediate plug should take as little space as possible on the printed circuit board.
This and other objects of the invention are achieved by means of an intermediate plug for printed circuit boards, the intermediate plug according to the invention being of planar, elongate construction can be fixed on a printed circuit board. The intermediate plug has electrical contacts which are plugged into a housing, and which are preferably in one part and of elongate form. The electrical contacts have two contact areas, a first contact area being in a form for electrical connection to printed circuit board pads and a second contact area being in a form for electrical connection to contacts of a mating plug. The second contact areas of the electrical contacts each form outer areas of the intermediate plug, which outer areas are visible without aid, and can be contacted directly from outside by the mating plug with its internal electrical contacts.
When plugged into the printed circuit board, the intermediate plug in an exemplary embodiment of the invention is connected electrically to the printed circuit board only on the outside. That is, the first contact areas abut on the pads only externally, and contact them electrically only from the outside. Penetration contacts, used generally for fixing the plug therefore become unnecessary.
In the case of an electronic or electrical module with an intermediate plug and a printed circuit board, the electrical contacts of the intermediate plug are soldered, pressed or clamped to the printed circuit board. Before final fixing to the pads, the electrical contacts can abut on the pads or printed circuit board with pretensioning.
According to the invention, electrical connection to the printed circuit board is no longer effected by direct contacting of the pads by means of a direct or mating plug, but via the intermediate plug, which may be in the form of an adapter plug. Therefore, for electrical connection to the printed circuit board, no resilient contacts of the mating plug act on the pads. According to the invention, the resilient contacts of the mating plug each contact a contact area of the electrical contact of the intermediate plug.
Providing the intermediate plug on the printed circuit board makes direct gold- plating of the pads or trace end portions unnecessary, because the contacting positions of the intermediate plug with the printed circuit board can be designed accordingly. This can be achieved, for instance, by soldering, clamping and/or appropriate dimensioning of the contact areas. The electrical contacting positions no longer have to be designed for the least favorable case of a mating plug which has not been plugged in properly, since the intermediate plug is preferably rigidly connected to the printed circuit board and is correspondingly pre-assembled when the module is fitted. hi an embodiment of the invention, the electrical contacts of the intermediate plug are metallized with precious metal at least at the (subsequent) contacting positions with the printed circuit board. Gold-plating or silver-plating is preferred. Such a precious metal coating of the first contact areas is advantageous to ensure reliability through a large number of insertion/withdrawal or mating cycles and low contact resistances.
Silver-plating or gold-plating of the electrical contacts is - despite the additional cost of the intermediate plug and of fitting it - significantly less expensive than the requirement for gold-plated or silver-plated printed circuit board pads. According to the invention, tin-plated pads can be used.
In a further embodiment of the invention, the electrical contacts can also be designed without silver-plating or gold-plating of the contact areas, which is particularly advantageous together with correspondingly rounded first contact areas, since in this way, in the case of frequent mating cycles, abrasion on the printed circuit board is minimized.
In an embodiment of the invention, a single electrical contact of the intermediate plug is in the form of an elongate, one-piece resilient contact. In this case, one longitudinal end portion of the electrical contact forms the first contact area, and an opposite longitudinal end portion forms the second contact area. The first contact area contacts the printed circuit board, whereas the second contact area can be contacted by the mating plug. The two contact areas are preferably on two surface sides of the electrical contact, substantially facing diametrically away from each other. The first contact area is preferably rounded, and the second contact area is preferably in a planar, lamellar form.
Because of the stretched-out, planar format of an electrical contact, the intermediate plug as a whole can be in a planar form with a small volume.
Preferably, a large number of electrical contacts are received in the housing of the intermediate plug, the first contact areas of the respective electrical contacts projecting out of the housing of the intermediate plug. Preferably, two such first contact areas are opposite each other with reference to a longitudinal axis of the intermediate plug, and between these two first contact areas, the printed circuit board can be received or clamped. Between two electrical contacts which are directly opposite each other, the housing of the intermediate plug in one embodiment of the invention has a recess starting from the outside, and the printed circuit board can be received at least in part in this recess. The intermediate plug has a preferably lamellar recess starting from the outside in the region of the second contact areas of the electrical contacts, so that the mating plug can contact the second contact areas electrically.
In an embodiment of the invention, two rows of electrical contacts are provided in the intermediate plug, and are arranged parallel to each other. This configuration makes a particularly planar form of the intermediate plug possible simultaneously with a large number of electrical contacts, so that the intermediate plug takes only insignificantly more space than the corresponding printed circuit board.
In an embodiment of the invention, the portion with the second contact areas of the intermediate plug is configured similarly or identically to a printed circuit board, so that by means of conventional direct plugs, which can otherwise be plugged into printed circuit boards, the intermediate plug according to the invention can be electrically contacted.
In an embodiment of the invention, the intermediate plug is constructed identically in certain portions or areas, and there is an electrical contact in each of these areas. The electrical contacts are selectively gold-plated, preferably in their first contact area. For assembly on the printed circuit board, the intermediate plug is placed or plugged onto the printed circuit board, and permanently fixed to the printed circuit board by an SMD or reflow soldering method. Other embodiments with a removable intermediate plug are of course possible.
Other embodiments of the invention are given in the other, dependent claims.
The invention is explained in more detail below on the basis of embodiments and with reference to the drawings, in which:
Fig. 1 shows a three-dimensional exploded view of a first embodiment of an intermediate plug according to the invention;
Fig. 2 shows a three-dimensional view of the completely assembled intermediate plug from Fig. 1 ;
Fig. 3 shows the first embodiment of the intermediate plug when assembled with a printed circuit board, and mated with a mating plug;
Fig. 4 shows a three-dimensional exploded view of a second embodiment of the intermediate plug according to the invention; Fig. 5 shows a three-dimensional view of the completely assembled intermediate plug from Fig. 4;
Fig. 6 shows a cross-section view along a plane A-A of Fig. 5;
Fig. 7 shows the second embodiment according to Fig. 4 of the intermediate plug in the "assembled with the printed circuit board" state, and mated with a mating plug;
Fig. 8 shows a three-dimensional exploded view of a third embodiment of the intermediate plug according to the invention;
Fig. 9 shows a side view of the intermediate plug from Fig. 8 when assembled with the printed circuit board; and
Fig. 10 shows a cross-section along a plane B-B of Fig. 9.
A first embodiment of an intermediate plug 100 according to the invention is shown in Figs. 1, 2 and 3. In this embodiment, the intermediate plug 100 is substantially in the form of an elongate cuboid. Fourteen electrical contacts 120 are provided in a housing 110 of the intermediate plug 100 in the example illustrated. However, any number, preferably an even number, of electrical contacts 120 can be provided in the intermediate plug 100. The electrical contacts 120 are preferably arranged in pairs in the longitudinal direction, at equal distances from each other. That is, the distances in the longitudinal direction of the intermediate plug 100 between the individual pairs of electrical contacts 120 are the same in each case, and the distances between the two electrical contacts 120 of a pair are also the same for all pairs.
The housing 110 has a preferably central, cuboidal recess 130, in which a portion of a printed circuit board 200 (see Fig. 3, and for a second embodiment of the invention Fig. 7) can be received. That is, at least in certain portions (see, in particular, the second embodiment of the invention) the housing 110 is in the form of a hollow cuboid, and open on a longitudinal side. In the region of the recess 130, the housing 110 is preferably in the form of a peripheral frame.
A single electrical contact 120 is in an elongate, one-piece form, and has two contact areas 122, 124. The first contact area 122 is convex, spherical, arched or partly cylindrical in form, whereas the second contact area 124 is substantially planar, stretched- out and lamellar. The electrical contact 120 can have locking elements such as projections or recesses, by which it can be locked into recesses or projections in the housing 110. The electrical contact 120 can also be clamped in the housing 110. The electrical contacts 120 are plugged into the housing 110 of the intermediate plug 100 in such a way that the first contact areas 122 protrude from the housing 110, and the second contact areas 124 are carried on the housing 110. The housing 110 has a recess starting from the outside in the regions of each of the second contact areas 124. Such a recess extends along each second contact area 124, and exposes a central portion of the second contact area 124. The two longitudinal edges of the second contact area 124 are preferably covered by the housing 110, so that the second contact area 124 cannot move away or release itself from the housing 110. In this exemplary embodiment, the second contact areas 124 do not extend to a longitudinal side or transverse end of the intermediate plug 100, but leave some space to it. This can easily be seen in Fig. 2, in which above the second contact areas 124, only housing material can be seen. The recesses in the housing 110 for the second contact areas 124 preferably extend to the corresponding longitudinal side or transverse end of the intermediate plug 100 (above in Fig. 2). Oppositely (below on the intermediate plug 100 of Fig. 2), this recess does not extend to the limit of the housing 110. In this region, a housing bar 150, behind which the electrical contact 120 can be plugged into the housing 110, is provided. This bar 150 also delimits a recess 140 for the electrical contact 120, and for instance the electrical contact 120 can be clamped into it.
As shown, the longitudinal edge of the second contact area 124 concludes flush with the housing portion which adjoins it in the direction of the longitudinal side (see also similar section A-A in Fig. 6). hi another embodiment, this end can also project somewhat from this housing portion; preferably, in this case too, the second contact area 124 is angled or given a bevel, to make plugging in of a mating plug 300 easier.
The electrical contacts 120 are shown here in the form of a resilient contacts 120. The resilient contacts 120 are in one piece and stamped or formed out of suitable sheet metal, e.g. spring steel sheet. The resilient contacts 120 may be tin-plated on all sides, and additionally or instead can be provided at least in part with a precious metal coating. This precious metal coating is may be, for example, gold-plating or silver-plating. The precious metal coating, if it exists, is preferably at least on the first contact area 124 of the intermediate plug 100. However, additionally or instead, the second contact area 122 of the intermediate plug 100 can correspondingly be given the precious metal coating. In another embodiment of the invention, the resilient contacts 120 can be provided completely with the precious metal coating. The extent to which such partial gold-plating or silver-plating is necessary depends on the field in which the intermediate plug 100 is later used.
Each resilient contact 120 is in such a form that its contact areas 122, 124 are provided at two longitudinal end portions of the resilient contact 120 facing away from each other. When the resilient contact 120 is plugged into the housing 110, the resilient contact 120 is first guided by a peripheral housing portion, which on one side is formed by the housing bar 150. As the resilient contact 120 moves forward into the housing 110, it slides along an outward opening portion of the housing 110, but abutting on a housing portion internally, until its final position. In the final position, the resilient contact 120 with its longitudinal edges abuts on a partly peripheral wall of the housing 110. However, this housing portion can also be omitted to save space, in which case the longitudinal edges of the resilient contact 120 are guided in grooves or an edge in the transverse direction in the housing 110.
Fig. 3 shows the intermediate plug 100 according to the invention in the fitted state, with a printed circuit board 200, the intermediate plug 100 being plugged onto the printed circuit board 200. The resilient contacts 120 contact electrical terminals 210 of the printed circuit board 200. The electrical terminals 210 can be, for instance, contact pads or traces of the printed circuit board 200; in the drawings, these electrical terminals 210 are contact pads 210. The resilient contacts 120 contact the electrical terminals 210 on the outside 220 of the printed circuit board 200.
In the embodiment shown, the printed circuit board 200 is contacted on two opposite sides 220. Contact pads 210 opposite each other can be either connected to each other electrically and materially in one piece, or not connected to each other electrically, so that in the case of the latter embodiment different electrical signals can be tapped at two resilient contacts 120 opposite each other.
The printed circuit board 200 is received in part in the recess 130 of the intermediate plug 100. The resilient contacts 120 can abut on the contact pads 210, with or without pretensioning. If the first contact areas 122 do not abut on the contact pads 210 with pretensioning, a pretensioning force is applied to the first contact areas 122, preferably via the mating plug 300 when it is plugged onto the intermediate plug 100. Additionally, in the case of resilient contacts 120 which are or are not under pretensioning, the resilient contacts 120 or their first contact areas 122 can be soldered, pressed or clamped to the pads 210. If they are soldered to the pads 210, this is preferably effected by an SMD or reflow soldering method.
The thickness dimension of the recess 130 for the printed circuit board 200 is preferably exactly as great as that of the printed circuit board 200 in the corresponding region. However, the recess 130 can also be thicker or, for a specific clamping effect, thinner. This also applies analogously to the length dimension. In the design of the intermediate plug 100 and printed circuit board 200, it should be noted that intermediate plugs 100 which will later be adjacent to each other and can be plugged together onto the printed circuit board 200. For instance, in one embodiment the result can be that the intermediate plug 100 is not closed at one or both longitudinal ends (not shown in the drawings).
According to the invention, the printed circuit board 200 is electrically connected or electrically contacted by the mating plug 300 via the intermediate plug 100, the mating plug 300 being plugged onto the intermediate plug 100 which is on the printed circuit board 200. Each electrical contact of the mating plug 300 contacts a second contact area 124 of the intermediate plug 100. The second contact area 124 is electrically connected to the first contact area 122, which is itself in electrical contact with an electrical terminal 210 of the printed circuit board 200.
As can be seen in Fig. 3, the first embodiment of the intermediate plug 100 according to the invention is only slightly larger than the printed circuit board 200 in the region in which the intermediate plug 100 is plugged onto the printed circuit board 200. In particular, on one side of the printed circuit board 200, one longitudinal end of the intermediate plug 100 concludes flush with the printed circuit board 200. This is preferably implemented via a recess 230 to a peripheral side edge of the printed circuit board 200.
To ensure that the intermediate plug 100 is protected against polarity reversal when it is plugged into the printed circuit board 200, keying recesses/projections corresponding to each other can be provided. This also applies analogously to the mating plug 300 with the intermediate plug 100.
A second embodiment of the intermediate plug 100 according to the invention, shown in Figs. 4 - 7, where its slimmer configuration can easily be seen, requires even less space than the first embodiment of the invention. Additionally, Fig. 6 shows a cross- section A-A of the second embodiment of the intermediate plug 100. In contrast to the first embodiment of the invention, in the case of the second embodiment the housing 110 is modified. The recess 130 is at least partly replaced by a fixed, solid wall 160, this wall 160, together with the second contact areas 124 which abut on it, having overall a thinner form than the first embodiment with the hollow space 130 and second contact areas 124. Also, guidance of the second contact areas 124 of the resilient contacts 120 by an external wall, which partly overlaps the second contact areas 124, of the housing 110, is omitted; but this is optional. Additionally, when the resilient contacts 120 are plugged into the housing 110, they are not guided on all sides, but mainly held in the recess 140 by two parallel housing portions. The housing portions preferably have a mutual overlap, in which there is an S -shaped transition portion of the resilient contacts 120, which connects the first 122 to the second contact area 124. At the sides, the resilient contacts 120 are guided by a housing projection.
The resilient contacts 120 of the second embodiment is likewise modified. Preferably, in the case of such an intermediate plug 100, the first contact area 122 and second contact area 124 of the same resilient contacts 120 are on the same level; i.e. among other things the gap between two directly opposed first contact areas 122 is the same as between two directly opposed second contact areas 124. This is implemented by a U-shaped portion of the resilient contacts 120, one leg of which is the S-shaped transition portion. This is necessary so that a mating plug which can be plugged onto a printed circuit board 200 can also be plugged onto the intermediate plug 100.
The final position of the resilient contacts 120 can easily be seen in the section A- A of Fig. 6. In this case the resilient contacts 120 are supported on the central internal wall 160 of the housing 110 with a side opposite the second contact area 124. In the transition region between the first contact area 122 and second contact area 124, the resilient contacts 120 are additionally supported on an inner side of an external wall of the housing 110. In this case the resilient contacts 120 are clamped between the inner side and the central internal wall 160, so that the resilient contacts 120 are locked in the housing 110. This can be supported by locking elements in/on the housing 110 and on/in the resilient contacts 120.
The intermediate plug 100 can also be locked on the printed circuit board 200 by means of locking projections 112, which can engage with corresponding locking recesses in the printed circuit board 200. A statically reversed variant with a locking recess 114 in the intermediate plug 100 and a corresponding locking projection on the printed circuit board 200 is of course possible. This also applies to the first embodiment of the invention, although in this case the locking means are not shown in Figs. 1 - 3.
The dimensions of the intermediate plug 100 in the regions in which the mating plug 300 can be plugged are preferably exactly the same as those of the printed circuit board 200 in the corresponding region. This applies, in particular, to the gap between two directly opposed second contact areas 124. In this way, it is possible to contact a mating plug 300 which is actually to be plugged onto a printed circuit board 200 electrically via the intermediate plug 100 with the printed circuit board 200. Also, in this case, the first contact area 122 of each individual resilient contacts 120 is preferably in a plane which is spanned by the appropriate second contact area 124 (see also Fig. 6, section A-A).
In a region between two resilient contacts pairs 120, 120 which are adjacent in the longitudinal direction, the housing 110 of the intermediate plug 100 is preferably reinforced, but in this case housing portions which adjoin the second contact areas 124 directly are preferably in alignment with the second contact areas 124. Between two such housing portions in alignment, preferably a reinforcing bar is provided, and preferably in turn is in alignment with the guide bar 150 for the resilient contacts 120, and/or with an external wall of the intermediate plug 100.
Fig. 7 shows the intermediate plug 100 fitted on the printed circuit board 200, the first contact areas 122 in turn contacting the pads 210 on the outside 220 of the printed circuit board 200 electrically. In the second embodiment of the invention, a portion, which can be received by the housing 110, of the printed circuit board 200 has a shorter form. This portion no longer - as in the case of the first embodiment of the invention - dips almost as deeply as a transverse end of the intermediate plug 100, but only a short way, that is approximately to the start of the second contact area 124. That is, the recess 130 for the printed circuit board 200 extends approximately to the S-shaped transition portion of the resilient contacts 120 (see Fig. 6, section A-A). In the case of such an embodiment, soldering the first contact areas 122 to the pads 210 is preferred, for reasons of stability.
Otherwise, the second embodiment of the intermediate plug 100 according to the invention is constructed analogously to the first embodiment of the invention.
Figs. 8 - 10 show a third embodiment of the intermediate plug 100 according to the invention. In this case, the housing 110 of the intermediate plug 100 is divided into two, the two halves being preferably constructed identically. The intermediate plug 100 is divided longitudinally, and in the assembled state has an analogous configuration to the second embodiment of the invention.
One or both housing halves of the intermediate plug 100 preferably have, on an inner side of the intermediate plug 100, two centring pins 180 for correctly oriented positioning of the intermediate plug 100 on the printed circuit board 200. The inner side also preferably has two recesses 190 for two supporting pins 240 of the printed circuit board 200, so that the intermediate plug 100 can be securely fitted to the printed circuit board 200 and is secured against kinking or slipping down. However, in each case only one or multiple centring pins 180 and recesses 190 can be provided. Additionally, as in the case of the second embodiment of the invention a short printed circuit board portion is received in the recess 130. However this is optional. The recess 130 can also be omitted.
It is also possible to provide the one-part housing configuration of the second embodiment of the invention with a recess 190 for a supporting journal 240, and even with a centring pin 180, which in this case snaps into the printed circuit board 200.
To fix the two housing halves to each other, they have locking elements in the inner sides facing each other. The locking elements are preferably on/in the planar side shown below in Fig. 8. Preferably, the locking elements are provided in such a way that the two housing halves are constructed identically, i.e. each housing half has, for instance, a locking recess and a corresponding locking projection, and these can engage with each other in a position rotated by 180°. In addition to or instead of mutual locking, the two halves can also be glued to each other.
In another embodiment, the intermediate plug 100 consists of only one housing half. This one-part intermediate plug 100 according to the third embodiment is suitable for printed circuit boards which have pads only on an outer side 220.
In the case of the third embodiment of the invention, particularly in the case of an intermediate plug 100 of only one part, the first contact areas 122 are soldered to the pads 210.
Otherwise, the third embodiment of the intermediate plug 100 according to the invention is constructed analogously to the first and second embodiments of the invention.

Claims

Claims
1. Intermediate plug for electrical contacting of a printed circuit board (200) with a mating plug (300), wherein a first contact area (122) of an electrical contact (120) of the intermediate plug (100) can be connected electrically to an electrical terminal (210) of the printed circuit board (200), and a second contact area (124) of the electrical contact (120) can be connected electrically to the mating plug (300), wherein the second contact area (124) of the electrical contact (120) forms a portion of an outer boundary of the intermediate plug (100).
2. Intermediate plug according to claim 1, wherein the electrical terminal (210) of the printed circuit board (200) can be contacted electrically only from outside through the first contact area (122) of the electrical contact (120).
3. Intermediate plug according to either claim 1 or claim 2, wherein the first contact area (122) and second contact area (124) of a single electrical contact (120) are provided on two sides of the electrical contact (120) facing away from each other, and preferably a single electrical contact (120) of the intermediate plug (100) is in the form of an elongate, one-piece resilient contact (120).
4. Intermediate plug according to any one of claims 1 to 3, wherein the whole electrical contact (120) is tin-plated, or at least the second contact area (124) of the electrical contact (120) is coated with a precious metal, preferably gold or silver.
5. Intermediate plug according to any one of claims 1 to 4, wherein the electrical contact (120) is received with a longitudinal end portion in a housing (110) of the intermediate plug (100) and, with its opposite longitudinal end portion, projects from the housing (110).
6. Intermediate plug according to any one of claims 1 to 5, wherein the intermediate plug (100) can be pushed onto an edge of the printed circuit board (200) in such a way that the printed circuit board (200) can be received in a recess (130) of a housing (110) of the intermediate plug (100).
7. Intermediate plug according to any one of claims 1 to 6, wherein the intermediate plug (100) in a region of the mating plug (300) to be plugged on is substantially exactly as thick as the printed circuit board (200) to which the intermediate plug (100) can be fixed.
8. Intermediate plug according to any one of claims 1 to 7, wherein the first contact area (122) and second contact area (124) of a single electrical contact (120) are substantially in one plane.
9. Intermediate plug according to any one of claims 1 to 8, wherein when the intermediate plug (100) is assembled on printed circuit board (200), the first contact area (122) of the intermediate plug (100) abuts on the electrical terminal (210) of the printed circuit board (200) with a mechanical pretensioning, or this mechanical pretensioning can substantially be generated by the mating plug (300) which can be plugged onto the intermediate plug (100).
10. Intermediate plug according to any one of claims 1 to 9, wherein the housing (110) is constructed of two housing halves which are divided in a longitudinal plane, and can each individually be connected to the printed circuit board (200).
11. Intermediate plug according to any one of claims 1 to 10, wherein multiple electrical contacts (120) are provided in the intermediate plug (100), and/or a single electrical contact (120) is constructed from two resilient contacts (120).
12. Electronic module having an intermediate plug (100) according to any one of claims 1 to 11 and a printed circuit board (200), the intermediate plug (100) being soldered and/or pressed and/or clamped to the printed circuit board (200). intermediate
PCT/EP2006/011562 2005-12-02 2006-12-01 Intermediate plug WO2007062866A1 (en)

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DE102012213076A1 (en) * 2012-07-25 2014-01-30 Ifm Electronic Gmbh Layer backup structure for plug connector, has supporting bracket that is provided to prevent tilting of plug connector during transportation from assembly station to soldering station
DE102016205939A1 (en) 2016-04-08 2017-10-12 Robert Bosch Gmbh Direct plug connection unit and battery module

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