DE19611719A1 - Contact arrangement for making high frequency sealing between two electronic circuits - Google Patents

Abstract

The contact arrangement makes a high frequency seal between two electronic modules with a front plate (13) joining their rear sides (9). At least one of the front plates (13) has on its rear side (9), which lies opposite the rear side of the other front plate, a groove (6). A high frequency seal element (1,2,3,4) is fastened in the groove (6). Preferably the groove (6) extends along the whole length of the rear side. The seal element (1,2,3,4) may have a holder element (5) by means of which it is fastened in the groove (6). The holder element may be wave-shaped wherein the wave crests and troughs extend perpendicular to the base of the groove.

Description

The invention relates to a contact arrangement for producing a high-frequency Tightness between two fronts adjacent to one another with their front sides plates of electronic assemblies.

With the penetration into ever higher frequency ranges, in which modern electro African modules are operated, the problem of radiation has become high frequency vibrations increased to an increasing extent. To the radiation too reduce or protect the modules against external interference electronic assemblies are shielded. Electronic assemblies are therefore regularly arranged in housings that provide a shield against interference represent. The effectiveness of such an umbrella depends heavily on the fact that the The screen is continuous, which means that there are no high-frequency leaks available. Critical points are in housings in which electronic construction groups with a front panel, the areas between next to one other arranged front panels.  

From DE 41 10 800 C1 it is known on the front plate of a slide-in assembly pe to arrange a spring element, which when inserting the module in the housing resiliently to the front plate of the assembly arranged next to it creates. A high frequency is generated by the electrical contact formed in this way moderate tightness of the gap between the two adjacent front panels achieved.

The known spring element has a spring for connection to the front panel clamp on, which is pushed onto a web provided on the front panel ben, which extends in the insertion direction of the module. The thickness of the Bars or the width of the spring clip must therefore be on top of each other be coordinated. For front panels with webs of different thickness, ent speaking contact springs with spring clips of different width who used the. In addition, the side surfaces of the web must be designed so that the spring can be pushed on. This is the middle of the front panel pointing side of the web is not available for fastening components.

Furthermore, the high-frequency seal is located by fastening the Spring element on the web extending in the insertion direction of the assembly relatively far inside the housing. This creates the electronic construction side of the front plate column facing away from the group, into which RF radiation penetrates can. This adversely affects the effect of the high frequency seal. For To improve the high-frequency tightness, it is therefore desirable to seal between the front panels as close as possible to the electronic construction to form groups facing away from the front panels.

It is an object of the invention to provide a contact arrangement as mentioned at the beginning train that the electrical contact between the adjacent Front panels as close as possible to that facing away from the electronic assemblies Side of the front panels, the contact being simple and safe can be produced.  

The solution to this problem results from the characteristics of the characteristic Part of claim 1. Advantageous further developments of the invention result from the subclaims.

According to the invention, at least one of the front panels has on its end face, which faces the relevant end face of the other front panel, a groove in which a high-frequency sealing element is attached. That way the high-frequency sealing element is not only particularly easy on the front plate, but the high frequency seal is also very close to that of the electronic assembly facing away from the front panel. The so far Existing gap between the two front panels can be almost full be constantly eliminated.

Advantageously, the groove extends completely over the entire length of the Face. This makes it very easy to manufacture. In particular, on already existing front panels in a simple manner according to the invention Be trained way.

The high-frequency sealing element advantageously has a holding element by means of which it is fastened in the groove. This allows the groove to be narrower Be formed slot, in which a correspondingly designed holding element is insertable by clamping.

However, the groove can also be designed so that it seals the high frequency element can at least partially accommodate. The high frequency seal sits Clamping element in the groove, a further fastening of the high-frequency Sealing element unnecessary. However, the groove can have a slot in its groove base have, in which the holding element of the high-frequency sealing element is clamped mend can be introduced.

In a special embodiment, the high-frequency sealing element is as Contact spring formed which has a spring leaf and one with it at one end  connected carrier sheet. The spring leaf and the carrier leaf form approximately that Leg of a U. The holding element can face away from the web of the U. be formed angled end of the leg of the U forming the carrier sheet.

Characterized in that the holding element is angled as facing away from the web of the U. End of the leg of the U forming the carrier sheet, it can be very easy to make. The holding element can also be designed such that the angled end of the carrier sheet is corrugated. In a particularly advantageous way the wave crests and the wave troughs extend in the longitudinal direction of the carrier leaves. As a result, the wave crests and the wave valleys run at in the inserted tongue in the direction of the groove base, that is approximately perpendicular to the bottom of the groove. Such designed holding means are not only particularly easy manufacture, but also ensure a firm hold in the groove. It can Holding element can be easily inserted into the groove. The introduction of the Holding element in the groove can still be facilitated in that the groove on the Groove opening has at least one beveled side wall. This will create a obtained approximately wedge-shaped groove opening.

A further improvement of the holding element can be achieved in that the angled end of the carrier sheet is wedge-shaped, the tip of the Wedge is located on the face of the end of the carrier sheet. This results in a very firm connection of the contact spring to the front panel. Has proven to be optimal however, it turned out that the angled end of the carrier sheet is corrugated and the same early wedge-shaped.

Another special embodiment of the contact spring provides that the Web of the U facing end of the leg formed as a spring leaf of the U in Is turned towards the carrier sheet. This ensures that the other The front panel is easily pushed next to the front panel containing the spring can be. The bent end of the spring leaf creates an inclined plane reached, along which the face of the other front panel when pushing the Front panel slides next to the first front panel.  

In a particularly advantageous manner, the end face has a first recess, which is designed such that the bent end of the spring leaf in installed state of the contact spring can extend into the first recess. This ensures that the spring leaf back a relatively large travel can lay. The contact spring or the first recess is made forms that the bent end of the spring leaf in the relaxed state of the Contact spring engages slightly with its end face in the first recess.

Another advantageous embodiment of the invention provides that the carrier sheet at its end facing the leg of the U into the away from the spring leaf pointing direction is turned. By such a turn, the for Spring effect effective length of the contact spring increased. On the one hand, this results in a better spring action and on the other hand in an increased service life of the Feather. The turn can be slight, causing the U-shaped formation the contact spring is essentially preserved, but it can also be very large be, whereby the U-shape of the contact spring only exists schematically.

So the carrier sheet can be bent almost at right angles, whereby the web extends approximately perpendicular to the surface of the front panel and the two legs of the U run approximately parallel to the surface of the front panel in the area of the web. At a right-angled bend of the carrier sheet, it is necessary that the spring sheet is also angled at its end facing the web of the U. Through the strong angling of the carrier sheet is achieved that the web of the U and the Web of the U facing areas of the spring leaf and the carrier leaf along Boundary lines can run that limit an area in which according to ent speaking regulations no components of the electronic assemblies may be enough. The boundaries of the area run regularly from the front of the Front panel starting parallel to the surface of the front panel at a distance of 1.5 mm and from the surface of the electronic assembly facing the Front plate in the direction of insertion at a distance of 2.5 mm. Since the so defined limit range parts of the contact spring may extend, the contact spring in the area where the spring leaf and the carrier leaf are connected to one another,  be designed differently. Common goal of different Aus However, it should be formations, the effective length of the carrier sheet and the spring to enlarge sheet. The area where the spring leaf is connected to the carrier sheet is, for example, can also be annular, the diameter of the Rings can be so large that it meets the mentioned boundary lines. Furthermore the spring leaf can run in an arc, which increases the length of the spring leaf enlarged. The spring leaf can also be slotted through the groove extend to be divided into segments. This will make contact even better tion reached.

In a further particularly advantageous embodiment of the invention is before seen that the groove in the remote area of the electronic assembly Front side of the front plate is formed. This is an advantageous way the effective length of the spring leaf and the carrier leaf of the contact spring enlarges and secondly the contact point is very close to that of the electronic assembly facing away from the surface of the front panel. This works shielding properties are particularly favorable.

In a further advantageous embodiment of the invention, the end face a second recess, which extends from the groove to that of the electronic Extends assembly facing surface of the front panel. Through the recess is achieved in an advantageous manner that the distance between the carrier sheet and the spring leaf can be enlarged. This is in view of the spring action of the Contact spring very beneficial.

Further details, features and advantages of the present invention will become apparent from the following description of a particular embodiment below Reference to the drawing.

It shows:  

Fig. 1 a first embodiment of a contact arrangement according to the invention in a schematic representation;

Fig. 2 shows a second embodiment of a contact arrangement according to the invention in a schematic representation;

Fig. 3 shows a third embodiment of a contact arrangement according to the invention in a schematic representation;

Fig. 4 shows a fourth embodiment of a contact arrangement according to the invention in a schematic representation;

Fig. 5 shows a contact assembly according to the invention in operating position, and

Fig. 6 shows a schematic arrangement of a contact spring according to the invention in plan view,

Fig. 7 shows a fifth embodiment of a contact arrangement according to the invention in a schematic representation;

Fig. 8 shows a sixth embodiment of a contact arrangement according to the invention in a schematic representation;

Fig. 9 shows a seventh embodiment of a contact arrangement according to the invention in a schematic representation;

Fig. 10 shows an eighth embodiment of a contact arrangement according to the invention in a schematic representation;

FIG. 11 shows the embodiment shown in FIG. 10 with an end face of a second front plate that is opposite it at the largest dimension, and

Fig. 12, the embodiment shown in Fig. 10 with an opposite in a small dimension designed opposite end face of a second front panel.

As can be seen from FIGS. 1 to 5, a front plate 13 has a groove 6 on one of its end faces 9 . The groove 6 extends over the entire length of the end face 9 . A surface 11 of the front plate 13 faces the electrical assembly. The groove 6 is formed in the region of the end face of the front plate 13 which is further away from the electrical assembly.

In the groove 6 is the angled end 3 of a carrier sheet 2 , 3 form the leg of an approximately U-shaped contact spring. The contact spring has a spring leaf 1 , 4 , which forms the other leg of the U. The end 4 of the spring leaf 1 , 4 facing away from the web of the U is bent in the direction of the carrier leaf 2 , 3 .

The front plate 13 has a first recess 12 on its end face 9 . The contact spring is designed so that the bent end 4 of the spring leaf 1 , 4 can extend into the first recess 12 when the contact spring is installed. In the relaxed state of the contact spring, the end face of the bent end 4 is located slightly in the first recess 12 .

Furthermore, the front panel 13 has on its end face 9 a second recess 10 which extends from the groove 6 to the surface 11 of the front panel 13 facing the electrical assembly.

The angled end 3 of the carrier sheet 2 , 3 is wedge-shaped. The tip of the wedge is located on the end face 8 of the end 3 of the carrier sheet 2 , 3 .

In the contact spring shown in Fig. 1, the carrier sheet 2 , 3 has a bend 7 , through which the connection of the carrier sheet 2 , 3 with the spring sheet 1 , 4 facing the end of the carrier sheet 2 , 3 pointing away from the spring sheet 1 , 4 Direction is turned. The spring leaf 1 , 4 and the carrier leaf 2 , 3 are connected to one another in an approximately U-shaped manner, the web of the U being semicircular.

To extend the spring leaf, the contact spring can also have the shape shown in FIG. 2. The connection of the spring leaf 1 , 4 with the carrier leaf 2 , 3 is designed as an almost closed ring from which the leg of the U forming the spring leaf 1 , 4 extends.

As can be seen in FIG. 3, the connection of the spring leaf 1 , 4 with the carrier leaf 2 , 3 can also be designed as an almost closed, particularly large ring, the diameter of which is so large that it is limited to the limits prescribed by corresponding regulations bumps within which no electrical components may extend. The spring leaf 1 , 4 runs in an arcuate manner, as a result of which it has an indentation 14 through which the length of the spring leaf is increased.

In the embodiment of the contact spring shown in FIG. 4, the carrier sheet is bent almost at right angles, as a result of which the web of the U runs approximately in the direction of insertion of the front plate and the regions of the two legs of the U adjacent to the web of the U run approximately parallel to the surface of the front plate 13 . The web of the U and the areas of the spring leaf 1 , 1 ', 4 which run parallel to the surface of the front plate 13 run along boundary lines which delimit an area into which no components of the electronic assembly may reach in accordance with corresponding regulations. The web of the U runs parallel to the end face 9 of the front plate 13 offset by 1.5 mm. The running parallel to the surface 11 of the front panel 13 part 1 'of the spring plate 1, 1', 4 runs at a distance of 2.5 mm parallel to the electronic module facing surface 11 of the front plate. 13

As can be seen in FIG. 5, the bent end 4 of the spring leaf 1 , 4 is pressed into the first recess 12 by the end face of the other front plate. The depth of the first recess 12 is such that the bent end 4 at an average distance of the two front panels of 0.45 mm meets the end face of the bent end 4 on the bottom of the first recess 12 . This results in optimal contact.

If the distance between the two front plates is reduced to the smallest dimension of 0.3 mm, the arc of the bend bends, which means that the contact spring remains undamaged, if the distance between the two front plates increases to the largest dimension of 0.6 mm, the width increases Contact spring on so that it lies with sufficient force on the front of the other front panel. There is no distance between the front panels, the arc of the bend bends so far that the spring leaf 1 , 4 is located entirely within the second recess 10 .

As can be seen from FIG. 6, the contact spring according to the invention is designed as a spring strip which has a plurality of spring leaves 1 , 4 and carrier leaves 2 , 3 . The angled ends of the carrier sheets 2 , 3 are wave-shaped, the wave crests and troughs extending in the longitudinal direction of the carrier sheets 2 , 3 . The wave crests and wave troughs thus run approximately perpendicular to the end faces of the angled ends 3 of the carrier sheets 2 , 3 .

In the contact arrangement shown in Fig. 7, the high-frequency sealing element 15 has in cross section approximately the shape of an A with a curved roof. The groove is designed so that the sealing element is approximately half in the groove. Only the semicircular roof of the A-shaped sealing element 15 is located outside the groove. For secure fastening of the sealing element 15 , the legs of the A are seated in slots formed in the base of the groove. The processing element 15 consists of a conductive rubber or plastic.

In the embodiment of the contact arrangement according to the invention shown in FIG. 8, the high-frequency sealing element 16 is triangular in cross-section and also sits approximately half within a groove. For fastening the sealing element 16 in the groove, a tab extends approximately perpendicularly from the base line of the triangle. The tab is clamped in a slot extending in the groove base.

In the embodiment of the contact arrangement according to the invention shown in FIG. 9, the high-frequency sealing element 17 is circular in cross section. It also sits about half in a groove. To attach the sealing element 17 in the groove, a tab is provided, which is clamped in a slot formed in the groove base.

As can be seen from FIG. 10, the high-frequency sealing element 18 can also have a tab-shaped cross section. The sealing element 18 is partially seated in a slot formed in the groove base. The tab can be a reinforced film or a profile. The sealing element 18 can also be made of metal.

The sealing elements shown in FIGS. 7 to 10 can be produced in the form of a profile strip or a sealing cord. The assembly of the sealing elements can then be achieved by stretching the profile band or the cord. When stretched, the material tapers, making it easy to insert the tabs into the slot formed in the base of the groove. The installation of the sealing element is facilitated by an insertion chamfer formed on the slot opening. Is the sealing element with its tab in the slot, the expansion of the profile or the cord is lifted. An independent clamping is achieved by the restoring force of the material of the sealing element.

Due to the elasticity of the sealing element, the tolerance of the distance between the end faces of the front panels balanced and yet with the greatest possible Distance a sufficient contact pressure is reached. The elasticity of the sealing element can be adjusted in that the sealing element inside a more or  has less large cavity, which results in different wall thicknesses surrender. The sealing element can also through slots, which are transverse to the groove extend to be divided into segments. This will make contact even better tion reached. Due to the small tolerances, which range from 0 to 0.6 mm can, only small distances need to be bridged by the sealing element the. The sealing element can therefore be made of a higher-resistance material be made than is the case with conventional high-frequency sealing elements is.

As can be seen from FIG. 11, the sealing element 18 extends from the groove to such an extent that it is still slightly curved when the front faces of the front plates are opposite each other to the greatest extent. As a result, even with the greatest possible distance between the end faces of the front plates from one another, there is still a sufficiently large contact pressure on the surface of the other end face. If the end faces of the two front plates are directly on top of one another, as shown in FIG. 12, the sealing element 18 bends to such an extent that it is completely in the groove.

Claims (11)

1. Contact arrangement for producing a high-frequency tightness between two with one of their end faces ( 9 ) adjoining front plates ( 13 ) of electronic assemblies, characterized in that at least one of the front plates ( 13 ) on its end face ( 9 ), which is the relevant end face of the faces the other front panel, has a groove ( 6 ) into which a high-frequency sealing element ( 1 , 2 , 3 , 4 ; 15 ; 16 ; 17 ; 18 ) is fastened. 2. Contact arrangement according to claim 1, characterized in that the groove ( 6 ) extends over the entire length of the end face ( 9 ). 3. Contact arrangement according to claim 1 or 2, characterized in that the sealing element ( 1 , 2 , 3 , 4 ; 15 ; 16 ; 17 ; 18 ) has a holding element ( 5 ; 19 ; 20 ; 21 ; 22 ), by means of which it is fastened in the groove ( 6 ). 4. Contact arrangement according to one of claims 1 to 3, characterized in that the holding element ( 5 ; 19 ; 20 ; 21 ; 22 ) is corrugated, the wave crests and the troughs extending approximately perpendicular to the groove base ( 8 ). 5. Contact arrangement according to one of claims 1 to 4, characterized in that the holding element ( 5 ; 19 ; 20 ; 21 ; 22 ) is wedge-shaped, the tip of the wedge on the end of the groove ( 8 ) facing the end ( 3 ) of the holding element ( 5 ; 19 ; 20 ; 21 ; 22 ). 6. Contact arrangement according to one of claims 1 to 5, characterized in that the sealing element ( 1 , 2 , 3 , 4 ; 15 ; 16 ; 17 ; 18 ) is designed as a contact spring ( 1 , 2 , 3 , 4 ), which a Spring leaf ( 1 , 4 ) and a carrier sheet ( 2 , 3 ) connected to it at one end, the spring sheet ( 1 , 4 ) and the carrier sheet ( 2 , 3 ) forming approximately the legs of a U and the holding element as the Web of the U-turned angled end ( 3 ) of the leg of the U forming the carrier sheet ( 2 , 3 ) is formed and fastened in the groove ( 6 ). 7. Contact arrangement according to claim 6, characterized in that the web facing away from the U end ( 4 ) of the spring leaf ( 1 , 4 ) formed leg of the U in the direction of the carrier sheet ( 2 , 3 ) is bent. 8. Contact arrangement according to claim 7, characterized in that the end face ( 9 ) has a first recess ( 12 ) which is designed such that the bent end ( 4 ) of the spring leaf ( 1 , 4 ) in the installed state of the contact spring ( 1 , 2 , 3 , 4 ) can extend into the first recess ( 12 ). 9. Contact arrangement according to one of claims 6 to 8, characterized in that the carrier sheet ( 2 , 3 ) at its end facing the web of the U is bent in the direction pointing away from the spring sheet ( 1 , 4 ) (7). 10. Contact arrangement according to one of claims 6 to 9, characterized in that the groove ( 6 ) is formed in the region of the end face of the front plate ( 13 ) which is more distant from the electrical assembly. 11. Contact arrangement according to one of claims 6 to 10, characterized in that the end face ( 9 ) has a second recess ( 10 ) which extends from the groove ( 6 ) to the electrical assembly facing surface ( 11 ) of the front plate ( 13th ) extends.