DE19851790A1 - Plug connection for service mounted device comprises metallic housing, two electrical contacts, contact member and orthogonal contact surfaces - Google Patents

Abstract

A service mounted device coaxial plug connection comprises a metallic housing (10) outer contact section, with two electrical contacts (16,17), an inner contact section (20) which is connected to a contact member (40) and two orthogonal surfaces (42,44). Each contact surface is coplanar to one of the electrical contact surfaces.

Description

The invention relates to an SMD coaxial connector, that is a coaxial connector, which is SMD-compatible.

SMD (Service Mounted Device) compatible coaxial connector are already known. For example, the company sells Rosenberger a coaxial connector, which by means of conventional SMD soldering technology on printed circuit boards and printed circuit boards is fixable. The coaxial connector has a cube shape miges, metallic housing on which to the mating side connects a hollow cylindrical housing wall. Inner there is an internal contact half of the housing. At the on the rear end wall of the housing is a circuit board adds which are perpendicular to the direction of insertion and up has conductor tracks reaching to the underside of the housing. The conductor tracks on this at the back of the housing arranged circuit board are on the one hand with the internal contact and on the other hand, with the metallic housing electrically in ver binding.

The problem with this known coaxial connector the so-called "meniscus formation", which in the automatic SMD soldering occurs. This means that at Pla tine of the coaxial connector different amounts of solder can set, which later leads to impedance problems during use this coaxial connector can lead. The disadvantage is white terhin that the internal contact and thus the hot conductor un shielded on the back of the housing. Finally, this known coaxial connector can only in who soldered a single position to a circuit board the. This only position is due to the design of the Coaxial connector set so that the thru axle in mer parallel to the circuit board on which the Koaxialsteckver binder is soldered.  

However, there is often a desire to use coaxial connectors with their thru axle also at right angles to the circuit board to be able to arrange. In the meantime, there are also SMDs Suitable coaxial connectors have become known in which There is a choice whether the thru axle is parallel to PCB or orthogonal to the PCB.

An example of such in two different Positions on a PCB mountable SMD coaxial connector is from Huber & Suhner AG, under the Designation SNT MMCX became known. This SMD-compatible Coaxial connector has a plastic housing, in which uses several specially curved contact brackets are. There is also a metal in the plastic housing lical, hollow cylindrical metal part used as External contact serves. In the opening of this metallic hollow an internal contact is inserted in the cylinder. Some of the mentioned The contact bracket stands with the metallic hollow cylinder electrically connected and one of the metal brackets to the Internal contact part. All contact clips are from the Wür in the shape of a box-shaped plastic and overlap two Outer walls of the plastic block, so that the plug side of the coaxial connector once parallel to the circuit board shows and the other time perpendicular to the circuit board stands.

This known coaxial connector is problematic because of the hot conductor and thus the internal contact Contact bracket is unshielded and therefore undesirable radiation characteristics can occur when an RF signal is passed through the coaxial connector.

The present invention therefore has the aim of one for SMD assembly suitable coaxial connector to specify the is optimally shielded on the one hand and in two on the other different positions on a printed circuit board that can. The coaxial connector to be found should  in addition, by a relatively simple structure and distinguish a simple assembly.

This task is accomplished with a coaxial connector Features of claim 1 solved.

This goal is achieved with a coaxial connector Feature of claim 1 solved.

Developments of such a coaxial connector Subject of the subclaims.

The SMD-compatible coaxial connector according to the present Invention is characterized essentially by the fact that he a metallic housing as an external contact part with two has other orthogonal ground contact surfaces. Dar In addition, an internal contact part is provided, the elek is connected to a contact bracket. The con Clock bar itself has two orthogonal to each other standing contact areas, with each of the contact areas to one of the ground contact surfaces of the housing is arranged coplanar is not.

With this configuration of the coaxial connector, it is easily possible, the coaxial connector in ho horizontal or vertical construction on a printed circuit board to attach using conventional SMD technology. In the the back end wall of the Ge sits vertically housing of the coaxial connector on the circuit board, so that a mating connector towards the circuit board in the Coaxial connector for establishing a plug connection is inserted, while in the horizontal design Long side of the housing of the coaxial connector on the PCB sits so that a mating connector is parallel to the level of the circuit board in the housing of the coaxial connector connector can be inserted.  

In a particularly preferred embodiment of the invention there is a first of the ground contact surfaces on the End face of the housing facing away from the plug-in side and a second the ground contact surfaces on a longitudinal wall of the housing. The second ground contact area is expedient here on a protruding from the longitudinal wall of the housing Wall section arranged. This protruding wall Section can be U-shaped in plan view of the housing be.

It has proven to be useful, the metallic housing made of brass, which is preferably gold-plated.

In a specific embodiment of the invention, this Housing approximately in the middle of the interior of the housing jumping, ring-shaped shoulder, covering the interior of the housing in a front, facing the plug side Cavity and a rear cavity divided. Centric too the annular shoulder is a contact pin of the Internal contact part. The contact pin protrudes with his Mating side facing end in the former cavity and with its rear end in the second cavity room.

The contact pin, which is preferably designed as a turned part is electrically connected to a contact bracket. The contact bracket can be easily manufactured as a stamped and bent part become. The contact clip preferably has one end ring-shaped part on which on one on the back the pin arranged pins are pushed can. An electrical connection of the two parts contact pin and contact bracket can, for example, by soldering, Riveting, welding or gluing take place. When ver It is important to ensure that there is a conductive adhesive is set.

Although the two-piece design of contact bracket and con  tact pin preferred because of the ease of manufacture is given, however, it is within the scope of the present Er find that the contact pin and the contact bracket also as one-piece part can be formed.

The contact bracket expediently has a longitudinal leg on, which connects to the aforementioned ring-shaped part. On the end of the longitudinal end opposite the annular part leg is a U-shaped bracket part integrally formed. On this U-shaped bracket part are those mentioned first and second contact surfaces are formed. The contact bracket is attached to the contact pin so that the cross leg of the U-shaped bracket coplanar to the second mass Contact surface of the housing is arranged. The second con tact area is through the longitudinal leg of the contact bracket facing outer surface at the distal end of the U-shaped bracket realized. This outer surface is in the assembled state of the Coaxial connector coplanar to the first ground contact surface arranged of the housing.

For HF technical reasons, it is advantageous if the Longitudinal leg of the contact bracket in comparison to the U-för reduced cross-section or has a reduced width.

In a particularly preferred embodiment of the invent The coaxial connector according to the invention is the one out of contact pin and contact bracket clamping existing internal contact part kept within the housing. For this is a plastic block, which preferably consists of two abutting art fabric panels is provided. The two plastic parts, preferably molded plastic parts, have a central opening in which the contact pin of the inner contact part sits. On there is a groove in the joint surfaces of the two plastic parts formed to at least partially accommodate the contact office gels. At the rear end of the coaxial connector is a Lid arranged, which by means of a snug fit or press fit  the plastic plates mentioned against the ringi mentioned press the shoulder.

It has proven advantageous that the plastic block or the two plastic parts forming the plastic block have a dielectric constant of approximately 2.5 to 4.0 and a dielectric loss factor of approximately less than 5 × 10 ^-3 . PPS, SPS or LCP are considered as preferred materials.

The coaxial connector according to the invention is as follows in connection with a specific embodiment hand of several figures explained. Show it:

FIG. 1 shows the coaxial connector in completely montier th state in longitudinal section view,

FIG. 2 shows the coaxial connector of FIG. 1 in per spectral tivi shear representation,

Fig. 3, the lid part of the connector of Fig. 1 and Fig. 2,

Fig. 3a to Fig. 3c shows the contact bracket in front view, Seitenan view and a perspective view;

Fig. 4a and Fig. 4b shows the fully assembled inside contact part with contact clip and the contact pin in a side view and a perspective view,

Fig. 5a and Fig. 5b of one of the two plastic parts of the coaxial connector of Fig. 1 in sectional representation and perspective view, and

Fig. 6a and Fig. 6b, the housing of the coaxial connector of Fig. 1 and 2 in a longitudinal sectional view and in plan view of the rear end wall.

Designate in the following figures, unless otherwise indicated, same reference numerals, same parts with the same Importance.

In Fig. 1 in longitudinal sectional view, and Fig. 2 in a perspective view shown SMD-compatible coaxial connectors includes a metallic housing 10 which is formed on approaching a hollow cylinder with a central passage opening, in one piece on the underside of the longitudinal wall of the housing 10 a Housing part is integrally formed, since the SMD coaxial connector can sit flat on a flat base. The metallic housing 10 expediently consists of a non-ferrous metal, for example brass, and is finished. The finishing can be done for example by gold plating.

In Fig. 1, the plug side of the coaxial connector is on the right. The inner wall of the housing 10 has an inwardly projecting, annular shoulder 14 at approximately half the axial length of the coaxial connector. This annular shoulder 14 divides the cavity already mentioned inside the housing 10 into a front cavity 12 facing towards the plug side and a rear cavity 18 . The housing 10 has two mutually orthogonal ground contact surfaces, which can be soldered to an SMD assembly of the coaxial connector with associated ground contact connections egg ner printed circuit board. The first ground contact surface 16 is defined by the rear end wall of the housing 10 . The rear end wall of the housing 10 is planar and approximately U-shaped (cf. FIG. 6b). The second ground contact surface 17 is arranged in the support part which is integrally molded onto the hollow cylindrical part of the housing 10 . The second ground contact surface 17 is also approximately U-shaped with a view of this ground contact surface.

In the housing 10, an inner contact part 20 is seated, the embodiment is provided in a longitudinally slotted socket contact 30 and a contact socket 30 at this electrically connected to the closed contact bridge 40th

The contact bracket 40 and the contact socket 30 can be seen in FIGS . 3a, 3b, 3c, 4a and 4b in even more detail in various views. The longitudinally slotted contact socket 30 is preferably a metallic rotating part which is arranged on the plug axis of the coaxial connector. The contact socket has a pin 34 on its rear side facing away from the plug side. The contact socket 30 is arranged zen trically within the opening formed by the annular shoulder 14 of the housing 10 and protrudes with its front part into the cavity 12 and with its back into the cavity 18th

An annular part 46 with its opening 45 is fixed around the pin 34 of the contact socket 30 . This can be done for example by gluing, welding, riveting or soldering. In any case, it must be ensured that there is a good electrical connection between the contact socket 30 and the contact bracket 40 . When the contact socket 30 is glued to the contact bracket 40 , it must be ensured that an electrically conductive adhesive is used.

The contact bracket 40 has a longitudinal leg 47 , which integrally connects to the annular part 46 . A U-shaped bracket part 48 connects in one piece to the end of the longitudinal leg 47 facing away from the annular part 46 .

As can be clearly seen in particular from FIGS. 3a and 3c, the longitudinal limb 47 compared to the U-förmi gen bracket part 48 has a slightly smaller width. This ver recent design of the longitudinal leg 47 in comparison to the U-shaped bracket part has been found to be favorable in terms of HF technology. The entire contact clip 40 can be produced, for example, as a stamped and bent part.

The dimensions of the longitudinal leg 47 and the U-shaped Bü gel part 48 of the contact bridge 40 are selected such that with correct assembly of the contact bar 40 and the contact sleeve 30 within the housing 10 of the coaxial connector 47 of the contact clip surfaces of the longitudinal leg 40 outside facing away from 42 and 44 lie coplanar to the second ground contact surface 17 or first ground contact surface 16 of the housing 10 of the Koa xial connector. This means that the outer surface of the cross leg of the U-shaped bracket part 48 of the contact bracket 40 lies in one plane with the second ground contact surface 17 of the coaxial connector. The outer surface of the free end of the U-shaped bracket part, which is provided in Fig. 3b with the reference numeral 44 , is in the same plane as the first ground contact surface 16 of the housing 10 of the coaxial connector.

This coplanar arrangement of the ground contact surface 16 of the housing 10 with the contact surface 44 of the contact bracket 40 on the one hand and the coplanar arrangement of the ground contact surface 17 of the housing 10 with the contact surface 42 of the contact bracket 40 on the other hand ensures that the coaxial connector is vertical or related to its stub axis can be placed horizontally on a circuit board for SMD assembly. The ground contact is in this case made via the ground contact surfaces 16 and 17 of the housing 10 , which serves as an external contact. The electrical connection to the internal contact 20 , on the other hand, takes place by soldering corresponding conductor tracks to the contact surfaces 42 or 44 .

The holder of the inner contact part 20 and thus the contact socket 30 and the contact bracket 40 is achieved in the following manner.

In the empty housing 10 (see FIG. 6a) a first plastic part 50 is inserted from the rear into the rear cavity 18 , as shown in FIGS . 5a and 5b in section and in perspective view. This plat tenform plastic part 50 is circular in its upper region with a centrally arranged hole 52 which is the diameter of the contact socket 30 is adjusted. On the right side in FIG. 5a and the side facing the viewer in FIG. 5b, an annular shoulder 57 protrudes from the outer edge of the plastic part 50 . This annular shoulder 57 has a larger inner diameter than the hole 52 , so that there is an annular recess 54 between the annular shoulder 57 and the hole 52 . The plastic part 50 also has a block-like and integrally molded foot part 58 , which is provided on its side facing away from the hole 52 with a recess 59 . The cross leg of the U-shaped bracket 48 of the contact bracket 40 can be inserted into this recess 59 . Finally, the plastic part 50 has on its rear side facing away from the annular shoulder 57 in the area of the foot part 58 a groove 56 or a gap, which will be discussed in more detail below.

The plastic part 50 is designed from its outer dimensions so that it can be inserted from the rear into the cavity 18 of the Ge 10 so far that it strikes the projecting annular shoulder 14 of the housing 10 . The two annular shoulders 57 and 14 are dimensioned such that they protrude equally far into the housing, that is to say they are flush with one another. After the plastic part 50 is inserted up to the stop on the annular shoulder 14 in the housing 10 , in such a way that the annular shoulder 57 strikes the annular shoulder 14 , the fully assembled inner contact part 20 with the contact socket 30 and the contact bracket 40 inserted into the housing 10 . Here, the contact socket 30 of the inner contact part 20 is pushed ge through the hole 52 of the plastic part 50 until the longitudinal leg 47 of the contact bracket 40 is seated in the groove 56 of the plastic part 50 . In the next step, an identically designed plastic part 60 is inserted into the housing 10 , but reversed, until it strikes the first plastic part 50 or the contact bracket 40 . Finally, the cover part 70 shown in FIG. 3 is inserted from the rear into the remaining cavity 18 of the housing 10 . The cover part 70 and the housing 10 are dimensioned such that the cover part is automatically held in the housing 10 by a press fit. In order to fasten the cover part 70 in the housing 10 , this is pressed into the housing 10 from the rear, the two plastic parts 50 and 60 still being pressed together. A secure mounting of the two plastic parts 50 and 60 and the contact socket and contact bracket held by them is thus ensured when the cover part 70 is inserted correctly. The cover part 70 expediently has a phase 72 at its edges, which makes it easier to insert the cover part 70 into the housing 10 .

The coaxial connector presented in this way is for an SMD Assembly very suitable. The coaxial connector has compared to the known similar Koaxialsteckver bind through an almost completely encapsulated and thus shielded structure because the inner contact part except for Except for the soldering areas shielded over its entire length is. This allows for the entire course of internal Cable routing for precise impedance matching. Beyond that This reduces the electromagnetic radiation to a minimum and the electrical properties that adversely affects as little as possible.

Further advantages of the coaxial connector presented are the following:

• - Due to the special shape of the contact bracket is one optimal coordination of the internal contact part with the nominal pedance possible
• - The two plastic parts 50 , 60 serve on the one hand for fixing the inner contact part and at the same time for electrical tuning. By suitable choice of the geometry of these plastic parts,
• - The cover part 70 fixes the two plastic parts and thus also the inner contact part 20 in that it is pressed into the housing 10 during assembly. In addition to the function of fixing the plastic parts 50 and 60 , the cover part 70 also assumes impedance matching and secure shielding of the coaxial connector to the rear,
• - The entire coaxial connector is installed by inserting individual components in the same direction tion, namely from behind into the housing of the coaxial connector,
• - It is a horizontal and vertical SMD assembly of the Koa axial connector possible,
• - The soldering area of the contact clip can be vertical and ho rizontal area have a different width to the different impedance ratios that are caused by the Re relative position to the PCB are to be taken into account gen, and
• - The position of the soldering area of the contact bracket is parallel to Stripline possible on a circuit board. Hereby the least possible influence of the soldering process on the electrical values achieved because there are no accumulations of solder can come.

Finally, the importance of the plastic parts 50 and 60 of the coaxial connector has to be discussed. In addition to the mechanical fixation of the inner contact part, these two plastic parts 50 , 60 , which are preferably injection-molded plastic parts, also serve to electrically tune the coaxial connector. The plastic parts 50 , 60 are preferably made of a material which has a dielectric constant Er of approximately 2.5 to approximately 4.0. The dielectric loss factor of the material should be <about 5 × 10 ^-3 . PPS (polyphenylene lens sulfide), SPS (syndiotactic polystyrene) or LCP (liquid crystal polymer) can be considered as materials.

Reference list

10th

casing

12th

cavity

14

annular shoulder

16

first ground contact area

17th

second ground contact area

18th

cavity

20th

Internal contact part

30th

Contact socket

32

slot

34

Cones

40

Contact bracket

42

first contact area

44

second contact area

45

hole

46

annular part

47

Longitudinal leg

48

U-shaped bracket part

50

first insulating part

52

hole

54

Recess

56

Groove

57

annular shoulder

58

U-shaped part

59

Recess

60

second insulating part

70

Cover part

72

chamfer

Claims (24)

1. SMD coaxial connector with the features:

• 1. a metallic housing ( 10 ) as an external contact part with two mutually orthogonal ground contact surfaces ( 16 , 17 ),
• 2. an inner contact part ( 20 ) which is electrically connected to a contact bracket ( 40 );
• 3. the contact bracket ( 40 ) has two mutually orthogonal to arranged contact surfaces ( 42 , 44 ), each of the contact surfaces Kon ( 42 , 44 ) to one of the ground contact surfaces ( 17 , 16 ) of the housing ( 10 ) is arranged coplanar.

2. SMD coaxial connector according to claim 1, characterized in that a first of the ground contact surfaces ( 16 ) is arranged on the end wall of the housing ( 10 ) facing away from the plug side. 3. SMD coaxial connector according to claim 1 or 2, characterized in that a second of the ground contact surfaces ( 17 ) on a longitudinal wall of the Ge housing ( 10 ) is formed. 4. SMD coaxial connector according to claim 3, characterized in that the second ground contact surface ( 17 ) is arranged on a projecting from the longitudinal wall of the housing ( 10 ) wall section. 5. SMD coaxial connector according to claim 4, characterized in that the fro projecting wall section is U-shaped. 6. SMD coaxial connector according to one of claims 1 to 5, characterized in that the metallic cal housing ( 10 ) consists of non-ferrous metal. 7. SMD coaxial connector according to one of claims 1 to 6, characterized in that the metallic cal housing ( 10 ) is refined. 8. SMD coaxial connector according to one of claims 1 to 7, characterized in that the housing ( 10 ) approximately in the middle in the interior of the housing ( 10 ) before jumping, annular shoulder ( 14 ) which the interior in a front, to the plug side facing cavity ( 12 ) and a rear cavity ( 18 ) divides, and that centrally between this annular shoulder ( 14 ) a con tact socket ( 30 ) of the inner contact part ( 20 ) sits. 9. SMD coaxial connector according to one of claims 1 to 8, characterized in that the con tact socket ( 30 ) with the contact bracket ( 40 ) is the verbun electrically. 10. SMD coaxial connector according to claim 9, characterized in that the con tact socket ( 30 ) and the contact bracket ( 40 ) are integrally formed. 11. SMD coaxial connector according to claim 9, characterized in that the con tact socket ( 30 ) and contact bracket ( 40 ) are formed in two parts and are soldered, riveted, welded or glued together. 12. SMD coaxial connector according to claim 11, characterized in that the con tact socket ( 30 ) on its side facing away from the plug side has a projecting pin ( 34 ), and that the contact bracket ( 40 ) at one end an annular part ( 46 ) has, which sits on the pin ( 34 ). 13. SMD coaxial connector according to one of claims 1 to 12, characterized in that the contact bracket ( 40 ) has a longitudinal leg ( 47 ) and an integrally formed on the longitudinal leg ( 47 ) U-shaped bracket part ( 48 ). 14. SMD coaxial connector according to claim 13, characterized in that the longitudinal leg ( 47 ) compared to the U-shaped bracket part ( 48 ) has a smaller width. 15. SMD coaxial connector according to claim 13 or 14, characterized in that the contact bracket ( 40 ) is designed as a stamped and bent part. 16. SMD coaxial connector according to one of claims 1 to 15, characterized in that the inner contact part ( 20 ) sits at least partially in a plastic block arranged within the housing ( 10 ). 17. SMD coaxial connector according to claim 16, characterized in that the plastic block consists of two plastic parts ( 50 , 60 ), each having an axis ( 52 ) lying on one axis, and that in these openings ( 52 ) the contact pin ( 30 ) of the inner contact part ( 20 ) sits, and that at the abutment surfaces of the two plastic parts ( 50 , 60 ) a groove ( 56 ) is formed for at least partially receiving the contact bracket ( 40 ). 18. SMD coaxial connector according to claim 16 or 17, characterized in that the plastic block or the plastic parts ( 50 , 60 ) are formed as molded parts. 19. SMD coaxial connector according to one of claims 16 to 18, characterized in that the two plastic parts ( 50 , 60 ) are identical. 20. SMD coaxial connector according to one of claims 16 to 19, characterized in that the plastic block or the plastic parts ( 50 , 60 ) consist of a mate rial with a dielectric constant of about 2.5 to 3.5. 21. SMD coaxial connector according to one of claims 16 to 20, characterized in that the material of the plastic block or the plastic parts ( 50 , 60 ) has a dielectric loss factor of less than about 5 × 10 ^-3 . 22. SMD coaxial connector according to one of claims 16 to 21, characterized in that the plastic block or the plastic parts ( 50 , 60 ) made of PPS (polyphenylene sulfide), SPS (syndiotactic polystyrene) or LCP (liquid crystalline polymers). 23. SMD coaxial connector according to one of claims 1 to 22, characterized in that the housing ( 10 ) is closed on its end wall facing away from the plug side by egg nem cover part ( 70 ). 24. SMD coaxial connector according to claim 23, characterized in that the cover part ( 70 ) is held by a press fit on the housing ( 10 ).