DE3732855A1 - PLUG - Google Patents

Abstract

A contact plug may be wave soldered in a preferably sealed electric component, although the original core cannot be soldered, at least not with sufficient reliability. An electrically conductive contact plug (S with H or with I) for conducting current and/or voltage to/from the electric connection of a component (E) is secured by an insulator (G), for example glass (G), within a passage in a support (K), for example a protecting housing (K) of the component (E), and contains on its surface a metal capable of being soldered with a solder paint, for example soft solder, at least on the spot (on H or I) where it can be soldered to a socket (M). The socket (M) is in turn made of a metal capable of being soldered and is arranged in a support (L), for example in a printed circuit board (L) made of insulating material. The contact plug (S with H or with I) has a pin-like core (S) of a metal not capable of being soldered, at least not reliably soldered, secured by means of the insulator (G) in the passage, conductively connected (for example by a bonded wire (D) to the component (E) and surrounded by a sheath (H or I). The sheath (H or I) is in turn electroconductively secured to the core (S), for example by spot welding, and is completely made of a material capable of being soldered or has a material capable of being soldered at least on the point of its surface at which it (H or I) is soldered to the socket (M). Long-time resistant, reliable contact plug soldering, in particular for motor vehicle electronic circuits.

Description

The invention is based on that in the preamble of claim 1 defined connector pin, which z. B. in semiconductor technology in the case of transistors is known.

The invention was developed per se with as little as possible Effort a surge-solderable, long-term reliable working Connector pin for a decelerator with electronic Sensor for the absolutely reliable deployment of an airbag to be able to manufacture in a motor vehicle, with the connector pin on initially not - or not sufficiently reliable - there is solderable material and the sensor in a capsule which is a well-insulated bushing for the Has plug pin. The solder joint between one Plug pin on the one hand and an associated socket on one PCB, on the other hand, still needs to be used after over a decade, So extremely long-term stable, extremely reliably conductive and be mechanically strong, so that the life-saving effect the eventual serious accident reliably for the entire duration the use of the vehicle in question can be achieved.

However, the invention is not limited to pins for this special sensor capsule, but generally on all connector pins applicable, which correspond to the preamble of claim 1.

It is known that connector pins have a pin-shaped electrical conductive, with glass in the implementation of a carrier can have melted core, which in turn with is surrounded by a shell, cf. the plug pins of the well-known Radio tubes. However, these plug pins only had to be in sockets inserted, but not reliable in sockets with long-term stability - e.g. B. by wave soldering - firmly soldered.  

A method is also known in which a additional manufacturing process the non-solderable connector pins are subsequently welded to connecting lugs, the Connection lugs for their part previously in the socket of a perforated plate or a printed circuit was soldered. This method but is relatively cumbersome.

The object of the invention

• - A long-term stable reliable in a particularly simple manner To achieve solderability of the connector pin, even if the Plug pin first consists of a material which not at all - or with the normal workshop standard In any case not reliable - solderable,

is solved by the measures specified in claim 1.

Allow the objects defined in the subclaims to achieve additional benefits. The object allows it according to claim

2, to achieve a relatively high bending stiffness of the plug pin, so that it bends accordingly rarely when inserted into the socket,
3, to design the sleeve so that it additionally serves as a spacer between the socket and the carrier, ie as a spacer between the support body on the one hand and the support of the component on the other, so that

• - Unintentional short circuits between the component carrier and lines on the support body accordingly can be easily avoided and
• - If necessary, a correspondingly good cooling of the component also accessible in the area between the support body and the carrier is

4, design the sleeve so with particularly little material to be able to do that

• - A remnant protruding from the sleeve at the end remote from the carrier of the core before soldering into the socket, to adjust the final position of the carrier relative to the support body, inserted can be,  
• - The sleeve as a spacer between the support body and can serve the wearer,
• - Unintentional short circuits between the component carrier and lines on the support body accordingly can be easily avoided and
• - If necessary, a correspondingly good cooling of the component also accessible in the area between the support body and the carrier is, as well

5, before soldering the sleeve to the socket, the adjustment to facilitate the wearer compared to the support body.

The invention is illustrated in the two figures Exemplary embodiments explained further. Here shows the

Fig. 1 symbolically two different embodiments of the pins on a carrier, and

Fig. 2 symbolically the connection of two embodiments of the connector pins on the one hand with the sockets of a circuit board on the other.

Both figures therefore show exemplary embodiments of the plug pin S with H or S with I. This connector pin is used to conduct currents and / or voltages to / from an electrical connection of the component E. The connector pin is, cf. Fig. 1, melted by means of a glass drop G in a bushing of the carrier K , the carrier K here being a capsule or a protective housing K of the component E.

The plug pin consists of a pin-shaped core S , which in turn consists of non-solderable metal - at least consists of non-reliably solderable metal. This core S is conductively connected to the component E within the carrier K via a bonded wire D. In addition, the core S is surrounded on the outside by a sleeve H, I , which in turn on the core S z. B. is fixed electrically conductive by spot welding. The sleeve, H, I is also either made entirely of solderable material or it is at least coated at any point on its surface where it is to be soldered to the socket M with solderable material. This means that the sleeve has solderable material at least at that point on its surface at which it can be soldered to the socket M. In the invention, the core S alone is fastened in the feedthrough of the support K by means of the glass drop / insulator G in such a way that no conductive electrical bridge is formed between the core S and the support K.

Therefore, the connector pin manufactured according to the invention - although its core S is at least not sufficiently reliably solderable in series production - on its surface H, I by means of solder, z. B. by means of tin solder, can be soldered to the socket M , this socket M in turn - at least on the surface in question - consists of solderable material and is attached in a support body L. So it is z. B. attached in a circuit board L made of insulating material, which carries thick-film or thin-film lines N , see. the symbolically represented lines N connected to a socket M.

The connector pin constructed in accordance with the invention can thus be produced by first fixing the core S by means of the insulator / glass drop G in the support K , after which the sleeve H, I is pushed over the core S and then, for. B. is fixed by spot welding. In this particularly simple manner, long-term stable, reliable solderability of the plug pin can be achieved, although the core S initially consists of a material which is not - at least not sufficiently reliably - solderable.

Fig. 1 and Fig. 2 each show an embodiment of a sleeve I , which is so long that it can be inserted into the socket M or through the socket M before soldering. In this way, a particularly tight fit of the pin S / I in the socket M is achieved not only before the soldering. In addition, a relatively high bending stiffness of the connector pin S / I is achieved by a sleeve designed in this way, so that the connector pin S / I will accordingly rarely bend when inserted into the socket M. This also reduces the reject that could otherwise occur when using the plug pin.

In the two exemplary embodiments of the plug pin S / H, S / I shown in FIG. 2 and in the exemplary embodiment of the plug pin S / H shown in FIG. 1, the sleeve surface in each case has a bulge / thickening V , which in turn is thicker than the inside diameter of the M socket and which, after soldering the sleeve to the M socket, defines the distance between the M socket and the support K. The bead / thickening V thus represents, in a manner known per se, when the plug pin is used, a stop up to which the plug pin can be inserted into the socket M. A sleeve designed in this way thus additionally represents a spacer between the bushing M and the support K , so that unintentional short-circuits between the support K and lines N on the support body L can be avoided correspondingly easily with a reasonable dimensioning of the thickening V. In addition, a correspondingly good cooling of the component E , in particular also in the region between the support body L and the support K , can be achieved by a spacer body formed in this way.

In Figs. 1 and 2 an exemplary embodiment of the plug pin is respectively shown on the left, in which the tube H at its female proximal end thicker than the inner diameter of the sleeve M, the sleeve H is generally so short that it to after the soldering the socket M forms a spacer H between the socket M and the carrier K. With particularly little material then the sleeve is designed so that unintentional short-circuits between the carrier K of the component E on the one hand and lines N on the support body L on the other hand can be easily avoided in this variant of the invention, with a correspondingly good one if necessary Cooling of the component E , especially in the area between the support body L and the support K , can be achieved. If, in this variant of the invention, a remainder of the core S protrudes sufficiently from the sleeve H at the end remote from the carrier, then this remainder of the core S can be soldered into the socket M - to adjust the final position of the carrier K relative to the supporting body L. - Be plugged in, which can greatly facilitate the subsequent soldering of the sleeve H to the socket M , especially in series production.

The embodiments show that the plugging and fastening according to the invention, for. B. welding, the tubular sleeve H, I made of solderable material can be achieved with very little effort and that the carrier equipped with such pins / structure K like other conventional structures, for. B. resistors and capacitors, positioned on supporting bodies / circuit boards L and - preferably in the wave soldering bath - can be soldered with the extremely high reliability sought in automotive electronics.

Claims (6)

1. Electrically conductive connector pin ( S with H or with I )

• serves to conduct currents and / or voltages to / from an electrical connection of a component ( E ),
• - By means of an insulator ( G ), for. B. glass ( G ), in a passage of a carrier ( K ), for. B. a protective housing ( K ), the component ( E ) is attached, and
• - On its surface by means of solder, z. B. tin solder, solderable metal at least at that point (on H or I ),
  • - At which he can be soldered to a socket ( M ), which in turn consists of solderable metal and which in a support body ( L ), z. B. in a printed circuit board ( L ) made of insulating material,

characterized in that

• - It ( S with H or with I ) contains a pin-shaped core ( S ) made of non - or not reliably - solderable metal, which ( S ) in turn
  • - is secured in the bushing by means of the insulator ( G ),
  • - Conductively (z. B. via a bonded wire D ) with the component ( E ), and
  • - Surrounded by a sleeve ( H or I ), the ( H or I ) in turn
    • - Is attached to the core ( S ) in an electrically conductive manner, for. B. by spot welding, and
    • - Is made entirely of solderable material or at least at that point on its surface where it ( H or I ) can be soldered to the socket ( M ) has solderable material.

2. connector pin ( S with I ) according to claim 1, characterized in that

• - The sleeve ( I ) is so long that it ( I ) can be plugged into or through the socket ( M ) before being soldered to the socket ( M ).

3. connector pin ( S with I ) according to claim 2, characterized in that

• - The sleeve surface has a bulge / thickening ( V ), which ( V ) in turn
  • - is thicker than the inside diameter of the bushing ( M ), and
  • - After soldering the sleeve ( S with I ) to the socket ( M ) the distance between the socket ( M ) and the carrier ( K ) defines.

4. connector pin ( S with H ) according to claim 1, characterized in that

• - The sleeve ( H ) is thicker at its end near the bush than the inner diameter of the bush ( M ), and
• - It ( H ) is so short overall that it ( H ) forms a spacer ( H ) between the socket ( M ) and the carrier ( K ) after soldering to the socket ( M ).

5. connector pin ( S with H ) according to claim 4, characterized in that

• - From the end of the sleeve ( H ) near the bush, a remainder of the core ( S ) protrudes, which in turn is thinner than the inner diameter of the bush ( M ).