FR3040118A1 - - Google Patents

Abstract

The present invention provides, in one aspect, a SMD component comprising an electronic component, a holder (10) for holding the electronic component and a plurality of U-shaped solder pins (12a; 12b) added to the carrier (10) which each have a first contact end (14a; 14b) for soldering to a printed circuit board and a second contact end (16a; 16b) connected to a connecting wire of the electronic component. According to the invention, the first contact ends (14a, 14b) are arranged in a first row on at least one side of the support (10) and a second row formed by the second contact ends (16a; above the first row on the corresponding side of the support (10). For at least some of the pins to be welded, the first contact ends (14a; 14b), viewed in a top view direction perpendicular to an extension direction of the first and / or second row, are each shifted by one offset distance along the extension direction relative to the respective second contact ends (16a, 16b).

Description

CMS component

The present invention relates to a CMS component (surface-mounted component), in particular an inductive component of the CMS component type intended to be fixed on a printed circuit board by at least one soldering pin.

Unlike cross-connection techniques in which the lead wires of the electronic components pass through mounting holes in a printed circuit board and are soldered to the back side of the board (or internal layers), the CMS devices are attached directly to a printed circuit board via solder terminals. This technique is often referred to as surface mount; it makes it possible to obtain a very dense lining with respect to the transverse connections, since for example the printed circuit boards obtained by the technique of surface mounting which can receive components on their two faces. Plastic bodies in common use for CMS devices are known for example from DE 101 14 182 A1 and DE 198 13 527 C1.

As components become more and more miniaturized, surface mounting is largely mechanized because careful manual positioning of components can not be done with the precision required. The operation of the circuits requires a perfect soldered connection and verification methods are employed for this purpose to control the quality of a soldered connection. This verification can be performed, for example, in the context of an automatic optical inspection (AOI), with image processing systems that are increasingly used for the control of solder joints, to control the quality a mechanical welded connection with higher accuracy and speed. However, it has been found that optical inspection of high integration density printed circuit boards requires high growth costs and that modern imaging processes must be used to maintain the reliability of the process. automatic optical inspection despite the increasing integration density on a printed circuit board. Starting from the situation described above, it is therefore desirable to provide a soldering pin for a SMD component and a SMD component which make it possible, despite the advanced miniaturization, to carry out an optical check of the soldered connections between a printed circuit board. and the CMS component with satisfactory accuracy and short control times.

According to one aspect of the invention, a CMS component comprises an electronic component, a holding medium of the electronic component and a plurality of U-shaped welding pins fixed to the support. The solder pins each have a first contact end for soldering to a printed circuit board and a second contact end connected to a lead wire of the electronic component. On at least one side of the support, the first contact ends are arranged in a first row, a second row formed by the second contact ends being formed above the first row on the corresponding side of the support. With this embodiment, for at least some of the pins to be welded, the first contact ends, viewed in a top view direction perpendicular to an extension direction of the first and / or second row, are each offset by a distance in the extension direction relative to the respective second contact ends. As a result, the contact ends of the pins to be welded are clearly visible in the context of an optical inspection of the pins to be welded and, in particular, that the sight on the first row of contact ends (in particular the first contact ends ) is not obstructed by the second row of contact ends.

According to an illustrative embodiment, the offset distance is in the range of 0.3 mm to 2 mm, preferably in the range of 0.3 mm to 1 mm.

In another illustrative embodiment, the first contact end and the second contact end of each solder pin are connected by a connecting part which extends at least partially in the support, the connecting part comprising in each case at least one link segment extending along the direction of the top view and a link segment extending parallel to the extension direction of the first and / or second row.

In another embodiment, the first contact end and the second contact end of each soldering pin are connected by a connecting part which extends at least partially in the support, the connecting part situated in the support forming an angle between 0 ° and 90 ° with respect to the extension direction of the first and / or second row.

In another embodiment, the electronic component is designed as an inductive component provided with a coil which is connected to the second contact ends of two solder pins. Alternatively, the inductive component may be provided with a plurality of coils each connected to the second contact ends.

In the aspect described above, it is advantageously avoided that the contact ends, seen along a direction parallel to the connecting portion and perpendicular to a direction along which the ends of the contact of elongated shape, are directly superimposed. It is obtained that the first elongated contact end of the soldering pin is clearly visible, when it is used in a CMS component, during an optical inspection of the pins to be welded and, in particular, that the view on the elongate first contact end, is not obstructed by the second elongate contact end, when the solder pin is inserted into a SMD component so that the connecting portion is oriented perpendicular to a base surface of the CMS component (the base surface designating the surface of a SMD component which, when surface mounted on a printed circuit board, is intended to be directed towards a surface of the printed circuit board). The invention is described below with reference to the appended figures, in which: Figure 1 is a schematic perspective view of a soldering pin according to certain concrete embodiments of the invention; Figures 2a and 2b are different views of a support for a CMS component according to some concrete embodiments of the invention; and Figures 3a and 3b show an enlargement of a side view of a support according to various concrete embodiments of the invention.

Referring to Figure 1, illustrative embodiments of the invention will now be described in terms of soldering pin.

Figure 1 schematically shows a perspective view of a solder pin 1, illustrating a U-shaped solder pin and which can be inserted into a support of a CMS component for the electrical connection of a CMS component held by the support with a printed circuit board. The soldering pin 1 has a first contact end 3 of elongate and rectilinear shape, and a second contact end 5 of elongated and rectilinear shape. The first contact end 3 and the second contact end 5 extend substantially in the same direction and are substantially parallel to each other. The term "essentially" means that an extension direction of the first contact end 3 and an extension direction of the second contact end 5 form with each other an angle of no more than 30 ° or 20 ° maximum or 15 ° maximum or 10 ° maximum or 5 ° maximum.

In an exemplary embodiment, the contact ends 3, 5 are represented by end regions of a conductive wire curved with a soldering pin, end regions at which an electrical contact is formed in CMS applications, between the solder pin and the CMS component (not shown) or the printed circuit board (not shown). In some concrete applications of the solder pin 1 in CMS devices (not shown), the contact end 3 is intended for example to be soldered to a printed circuit board (not shown). In addition, the second contact end 5 serves for the mechanical or electromechanical connection of the soldering pin 1 with an electronic component (not shown) of a CMS component (not shown).

Concrete examples of CMS components are described below with respect to Figures 2a, 2b, 3a and 3b.

The first contact end 3 and the second contact end 5 of the soldering pin 1 are mechanically and electrically conductive connected to each other via a connecting portion 7. The connecting portion 7 comprises, according to FIG. the example shown in Figure 1, a first link segment 7a and a second link segment 7b, the first link segment 7a and the second link segment 7b being oriented, at least in places, transversely to a direction along which the contact ends 3.5, of elongated shape, extend. In the example shown, the connecting segments 7a and 7b are oriented, at least in places, orthogonally to one another. This orientation is not limiting and, alternatively, the connecting segment 7a can be oriented, at least in places, obliquely with respect to the connecting segment 7b.

According to the embodiment shown in FIG. 1, the first connecting segment 7a produces with the first contact end 3 a U-shaped shape since a lower segment 7a1, of elongated shape, of the first connecting segment 7a extends perpendicular to the contact ends 3.5 and an elongated upper segment 7a2 of the connecting segment 7a extends parallel to the direction of extension of the contact end 3. In addition, the second contact end 5 and the second connecting segment 7b form, according to the representation of Figure 1, an L-shaped section of the welding spindle 1. This configuration is not limiting and the connecting segment 7b can be directly in contact with the lower segment 7a1 without the upper segment 7a2.

According to the embodiment shown in FIG. 1, a plane formed by the first contact end 3 and the first connecting segment 7a and a plane formed by the second contact end 5 and the second connection segment 7b are oriented in a manner not parallel to each other. As shown, the plane formed by the first contact end 3 and the first connecting segment 7a may be perpendicular to the plane formed by the second contact end 5 and the second connecting segment 7b.

To better illustrate this description, a three-dimensional xyz coordinate system is integrated in FIG. 1. With respect to the xyz coordinate system shown, the first and second contact ends 3, 5 may for example extend along the direction x, while the connecting part 7 comprises at least one segment (see segment 7a1) which extends, at least partially, along the z direction and, optionally, another segment (see segment 7a2) which extends along the y direction of the xyz system.

In an exemplary embodiment, the soldering pin 1 is designed such that the second contact end 5 is outside a plane determined by the first contact end 3 and the substantially U-shaped shape of the pin 1. With reference to FIG. 1, a plane may for example be defined by the first contact end 3 and the first connection segment 7a, the second contact end 5 being situated outside this plane.

As shown in Figure 1, an offset V is therefore produced between the first contact end 3 and the second contact end 5, which offset comprises a component along the y direction (see Vy shift component) and a component along the z direction (see offset component Vz). Conventional U-shaped (that is, flat U-shaped) solder pins, on the other hand, simply have an offset distance with an offset component, for example, only in the z direction, because in their case, since the contact ends define a plane with the connecting portion and the contact ends are offset with respect to each other in this plane.

This means that a plane formed by the contact ends 3, 5, such as that indicated for example in FIG. 1 by a section of plane E with a normal vector n, is therefore oriented, at least in certain places, to obliquely with respect to at least one connecting segment 7a, 7b, so that the at least one connecting segment 7a, 7b extends, at least in places, non-parallel to the plane (see section of plane E in Figure 1) respectively not perpendicular to the normal vector n. Regarding the representation of Figure 1, the plane section E is oriented at an angle α relative to the direction z, 0 ° <I α I <90 ° applying to the size of the angle. According to some exemplary embodiments, 5 ° <lal <30 ° may apply.

According to some concrete embodiments, a length of the link segment 7a is greater than a length of the link segment 7b. In some explicit examples of this case, a length of the lower segment 7a1 may be greater than a length of the link segment 7b. If we look at the solder pin 1 along a direction parallel to the segment 7a1, the offset Vy between the contact ends 3, 5 is visible and the contact ends 3, 5 can be correctly distinguished optically. In addition, the offset Vz is larger than the offset Vy. The shift Vy is in particular determined by the link segment 7b, while the offset Vz is defined by the lower segment 7a1.

Figure 2a is a schematic perspective view of a support 10 for an inductive component (not shown), for example a transformer or an inductor. The support 10 maintains a magnetic core (not shown) and a winding (not shown). Wires for connecting the winding (not shown) are intended to be connected with U-shaped solder pins of a plurality of U-shaped solder pins, for example with at least one U-shaped solder pin. a first plurality of U-shaped solder pins 12a located on a first side of the support 10, and with at least one U-shaped solder pin of a second plurality of U-shaped solder pins 12b located on a second side of the support 10, the first and the second side representing opposite sides of the support 10. When assembling the components on a printed circuit board (not shown), a lower face U of the support is connected to a control board. printed circuit (not shown), the connection being able to be made for example by welding the first contact ends 14a, 14b of the plurality of soldering pins 12a, 12b.

Figure 2b is a schematic view of the lower face U of the support 10 of Figure 2a. As shown in Figure 2b, the first contact ends 14a, 14b are offset from the second contact ends 16a, 16b of each solder pin of the plurality of solder pins 12a, 12b. This means that the first and second contact ends 14b, 16b of each soldering pin are offset by an offset distance Vb perpendicular to the direction of the view of Figure 2b. Similarly, the first and second contact ends 14a, 16a are offset by an offset distance Vc relative to one another. By this means, it is ensured that the first and second contact ends 14b, 16b respectively 14a, 16a are clearly visible during an optical inspection of the pins to be welded, in particular that the first contact end 14b or 14a respectively is not visible. not covered by the second contact end 16b respectively 16a. In other words, a plane formed by the contact ends 14b, 16b respectively 14a, 16a of a welding pin intersects the cutting plane shown in Figure 2b at an angle between 0 ° and 90 °.

In order to improve the insulation resistance and the creep resistance, it is possible, in addition, to form on the underside U of the support 10 protrusions 17 defining between them grooves, so that the resistance to creep and the insulation resistance between adjacent solder pins can be advantageously increased.

Figures 3a and 3b are schematic views each showing an enlargement of one side of the support 10 of Figure 2a.

The side view shown in Figure 3a is oriented perpendicular to a top view direction A, parallel to the view of the lower face U shown in Figure 2b. According to the exemplary embodiment shown in Figure 3a, contact ends 14a of the solder pins of the first plurality of solder pins 12a on the first side, in Figure 2a, are located in a first plane E1, so that the first plane E1 extends along a first direction R1 perpendicular to the top view A. With this arrangement in the foreground, the contact ends 14a are arranged in a first row.

In addition, the second contact ends 16a on the first side are arranged to define a second plane E2 which extends along a second direction R2. Therefore, the second contact ends 16a are arranged in a second row which is located above the first row and above the underside of the support 10. For example, a distance between the second plane E2 and the face lower (see Vf,

Vg in Figure 3a) can be between 1 mm and 3 mm.

According to the particular embodiment represented by way of example, the directions R1, R2 are oriented parallel to each other. This is not a limitation of the invention. The directions R1, R2 can also be oriented non-parallel with respect to each other, as long as an offset distance Ve, respectively Vd, determined> 0 exists between the first contact end 14a and the second end contact 16a in the illustrated view. This result can, for example, be obtained when the soldering pin 1 shown in FIG. 1 is thus injected into the support so that the lower segment 7a1 of FIG. 1 is oriented perpendicular to the lower face of the support 10 in FIG. 3a (see also the lower face U of the support 10 in Figure 2a). When the support 10 is considered along the top view direction A (and thus parallel to the extension direction of the lower segment 7a 1 of the soldering pin 1 in FIG. 1), the first contact ends 14a do not are, therefore, not covered by the second contact ends 16a.

In the coil bodies described above with respect to FIGS. 2a, 2b and 3a, the following exemplary embodiments are described below.

In an exemplary embodiment, a CMS component comprises an electronic component and the support 10 for holding the electronic component, the holding support 10 being provided with at least one soldering pin, as described above for FIG. 1. The CMS component can therefore be connected to a printed circuit board and the soldering pin is oriented in the holding support 10 so that the connecting segment (see 7a1 in the embodiments described above) in contact with the first contact end (see 3 in the embodiments described above) is oriented substantially perpendicular to a base surface of the CMS component. In one example, the soldering pin is injected into the holding support 10 and the connecting part (see 7 in the embodiments described above) extends entirely into the holding support 10.

Figure 3b shows an alternative embodiment in which conventional U-shaped solder pins are injected into the holder 10 so that first contact ends 14a are not covered by second contact ends 16a when the support is considered along the top view direction A. By this means, it achieves an advantageous inspection of the pins to be welded, the first contact ends 14a not being covered by the second contact ends 16a. In addition, when the son are not round, as shown in the figures, they are not arranged straight on a printed circuit board: the contact ends do not lie flat on a printed circuit board, but on a stop.

In different examples of embodiments of the invention, the concrete values for at least one of the offset distances Vy, Vd, Ve, Vb, Vc may be between 0.3 mm and 2 mm, preferably between 0.3. mm and 1 mm.

In different concrete embodiments, at least one distance among Vy, Vz, Vb, Vc, Vd, Ve, Vf, Vg may be different from at least one other of the distances Vy, Vz, Vb, Vc, Vd,

Ve, Vf, Vg. In some examples, the distances Vy, Vb, Vc, Vd, Ve may be equal.

In different examples of embodiments of the invention, the concrete values for the offset distance Vz may be between 2 mm and 3 mm.

The fact that the figures show solder pins formed of conductive wires not having a round shape does not constitute a limitation of the invention. In a variant, the solder pins according to the invention may be formed of round conductive wires.

Claims (5)

claims A CMS component comprising an electronic component, a support (10) for holding the electronic component and a plurality of U-shaped solder pins (12a; 12b) added to the carrier (10) each having a first contact end ( 14a; 14b) for soldering to a printed circuit board and a second contact end (16a; 16b) connected to a connecting wire of the electronic component, the first contact ends (14a; 14b) being arranged in a first row (E1) on at least one side of the support (10) and a second row (E2) formed by the second contact ends (16a, 16b) being formed above the first row (E1) on the corresponding side of the support (10), characterized in that, for at least some of the pins to be welded, the first contact ends (14a; 14b), seen in a top view direction (A) perpendicular to an extension direction (R1 R2) of the pr first and / or second row (E1, E2) are each shifted by an offset distance (Vb, Vc, Vd, Ve) along the extension direction (R1, R2) with respect to the second contact ends (16a; 16b) respectively. The SMD component according to claim 1, wherein the offset distance is between 0.3 mm and 2 mm, preferably between 0.3 mm and 1 mm. A SMD component according to claim 1 or 2, wherein the first contact end (14a; 14b) and the second contact end (16a; 16b) of each solder pin are connected by a connecting portion (7) which extends in the support (10), the connecting part (7) comprising in each case at least one connecting segment (7a, 7b) extending along the direction of view from above and a connecting segment ( 7a, 7b) extending parallel to the extension direction of the first and / or second row (E1, E2). A SMD component according to claim 1 or 2, wherein the first contact end (14a) and the second contact end (16a) of each solder pin are connected by a connecting portion (18a) extending into the support, the connecting portion (18a) in the support forming, at least in some places, an angle of between 0 ° and 90 ° with respect to the direction of extension of the first and / or second row (E1, E2) . 5. SMD component according to one of claims 1 to 4, wherein the electronic component is designed as an inductive component provided with a coil connected to two second contact ends of two pins to be welded, or provided with several connected windings. each with two contact ends of two pins to be welded.