DE10047101C2 - RF shielding - Google Patents

Description

The invention relates to RF shielding housings and methods their manufacture.

The clocking of electronic components up to the gigahertz area or above as well as the realization of messages transmissions with extremely high carrier and signal frequencies has the consequence that associated electronic circuits must be electrically shielded at least in sections to emit electromagnetic radiation to the Prevent environment. In other cases it may also be necessary be an electrical circuit against electromagnetic Radiation that can penetrate the circuit from the outside protect because, for example, the function of the circuit the electromagnetic radiation is disturbed.

Shielding housings are usually used for this purpose, all of which are constructed according to a predetermined principle. Such a shield housing according to the state of the art, which is designed to accommodate a TV demulator or tuner circuit, is shown in FIG. 4. The shield housing is formed by a frame 40 and two associated covers 41 , 42 , which are used to form a Faraday cages can be brought into engagement with the frame 40 . To design the frame, four metal strips are connected to one another to form a rectangular base, and shields 45 can be arranged in the interior of the frame to shield parts of the demodulation circuit against other sections of the electronic circuit within the housing. The shielding webs 45 have contact pins 46 with which the shielding webs 45 can be connected to the electronic circuit at predetermined points. As standard, the frame 40 including the shielding webs 45 and the contact pins 46 are integrally formed from a single, appropriately punched sheet metal. This means that the shielding webs and contact pins are produced together with the frame without the shielding webs or the contact pins having to be subsequently connected to the frame. Here, adjoining frame sides are connected at the edges in each case via webs not shown in FIG. 4, it being possible for the two assigned frame sides to be connected at each edge via a further connecting means, also not shown. For example, a frame side can engage with a projection in an associated hole on the edge of the adjacent frame side. In any case, the frame 40 is formed by bending the corresponding sections from a single flat sheet. The same applies to the two lids 41 , 42 , which often have an integrally formed peripheral edge 47 formed from resilient tabs, which can be brought into engagement with the frame to hold the lid. To contact the electronic circuit located in the shielding housing with an external circuit or an external connector strip, a contact pin strip 44 is also included, in which the individual contact pins are injected into a plastic body. The vertically downward contact pin sections with which the contact pins can be soldered to the electronic circuit in the shielding housing are not visible in the figure. Frequently, the contact pin strip 44 can be clipped in by providing complementary holding means on the associated frame side and the contact pin strip on the frame.

To feed in an exemplary satellite signal, an antenna socket 43 is also used, which is attached to the frame 40 after its manufacture, either mechanically or by soldering, the associated opening in the frame not being shown in FIG. 4.

All of the components shown in FIG. 4 can be formed by processing flat metal sheets, for example stamping and forming, the contact pins of the contact pin strip 44 being subsequently injected into plastic.

The fact that the frame 40 and both covers 41 , 42 can each be formed integrally from a single sheet metal part, the shielding housing formed from it can be produced relatively cheaply.

In the German patent DE 195 01 340 C1 a sheet is housing consisting of a box-shaped base and an this pivotally hinged lid proposed, the Area of the pivotable articulation by parallel to the screen ting surfaces of the bottom and lid, lying side by side longitudinal slits is formed.

In the German patent DE 35 15 910 C2 is a high Frequency-tight housing described, in which a direct electrical connection between the circuit board and the coax alkabel outer conductor exists. For this purpose, the housing comprises two metallic half-shells with molded connecting pieces, whereby these sockets each make an external contact, wel cher is mechanically connected to the circuit board and thereby forms an electrical contact with the circuit board.

Furthermore, German Patent DE 33 25 360 C2 a metallic shield made of folded sheet metal housing described, with the bottom, the lid and the walls formed by unfolding a single sheet blank are and the cover on a housing wall around a through kink openings  predetermined bending line is pivotally held. The Kink breakthroughs are designed such that an edge a straight punched edge is formed and the other edge is an arc edge, at least in the region of the ends of the Cutting edge is bent.

Especially nowadays and especially with a crowd goods such as the shielding housings described, however, it is very important to further improve manufacturing and work processes, to save costs.

The invention is based on the object, conventional screen housing or its components continue like this to make up both the manufacture and the hand Simplification to further minimize costs pass.

According to the invention, this task is already achieved by an HF-Ab Screen housing according to claims 1, 13, 16 and 21 and a Process for its production according to claims 25, 26 and 27 solved.

The invention is based on the idea of individual components assign additional functions to the RF shielding housing so that other elements can be saved or work processes when assembling the shielding housing or equipping it be simplified with an electronic circuit. Thereby, that the functions of certain components differ from other components can also be taken over, the number of necessary Components are reduced. Because certain components provide additional functionalities can also work steps saved or simplified. To take over the additional function, the remaining components in it be redesigned according to the invention.  

The basic idea leads to a multitude of fiction according embodiments. For example, it is possible to Function of the housing and the RF connector, the function of the Cover and the RF connector, the function of the frame and the RF connector or the function of the frame and pin header each in a single, integrally manufactured component sammenzufassen. This reduces both the Her service costs as well as the effort for the following months daily work, including the introduction of electrical Circuit in the shield housing according to the invention.

To combine the function of the housing and the RF connector grasp, is provided according to the invention, the shield housing to form two complementarily shaped half-shells. This means that instead of the two lids and the frame only two parts are made and in the following ar workflows must be integrated. The with regard to the necessary forming technology very complex frames can be omitted, instead, half-shells are much easier adjustable. The term half-shell is not according to the invention to understand that both half-shells are identical, in particular both half shells the same height to determine the depth of the Shielding housing must have. The half shells can be white have any shape, they must only both together to define a shielded room be trained. Furthermore, parts of the Ab umbrella housing also have features that are specific to the rear look at a quick assembly, for example to assemble the Contact pins are formed and at least after assembly partially no longer available. The device "Ab shield housing "is to be understood in an expanded sense in this sense. Wei terhin is the term "RF shielding housing" in particular Not to be interpreted as restrictive with regard to high frequencies. At least parts of the RF connector are integral to a housing shaped half-shell.  

The two half-shells can be made after their manufacture are connected to each other, for example by riveting, Toxen or using a clip mechanism.

Basically, the housing half according to the invention shell from a sheet metal, the housing half-shells each by sheet metal forming, in particular by means of a low drawing process, from a punched out in a predetermined manner individual sheet metal part are generated. However, it is dependent the required shielding properties of the shielding housing in very special cases, the housing half-shells are also possible made of plastic using simple injection molding techniques len and subsequently metallize, this Metallisie in individual cases through the use of conductive art fabric can be omitted.

A conventional shield housing consisting of the two De and the frame can be simplified according to the invention be that at least one cover at least one section an outer conductor cylinder shell of an RF connector, each integrally with one or both lids a single sheet metal part is formed. This can be done after sluggish attachment of the connector to the frame at least he be lightened or even completely eliminated.

The cumbersome and time-consuming work processes at Contacting of the electronic circuit in the shield housing to facilitate with an external circuit, it is provided that a row on at least one side of the conventional frame from side by side across the length of the page there are nete and equidistantly spaced contact pins, each at one of their two ends with a common one Web are connected, the web being connected to the frame is, and advantageously the frame together with the web  and integrally molded the contact pin from a single sheet can be. This allows the con tact pins at the relevant point and even pre-adjusted position in the Frames are kept, which also entails the risk of loss the contact pin strip picks up during assembly.

Will the function of the shielding bars attached to the frame conventional shielding housing by appropriate sections of the lid, it can be achieved that the Manufacturing process of the frame greatly simplified during the Manufacturing process for the lid is not corresponding becomes more complex.

Advantageous embodiments of the invention are in the Un claims specified.

It is extremely advantageous if both housing half-shells in tegral as a single part together with one the two halves shell connecting connecting means are produced. The connecting means can, for example, as a folding strip or Perforation strip can be formed, via which the two Half shells to create a shielding room on top of each other are foldable.

Different embodiments are advantageous. Is on both housing half-shells or on both covers externally extending semi-cylindrical shell-shaped element forms and arranged both elements so that in the merged set condition of the housing half-shells or the cover the outer conductor cylinder shell of an HF-Ver form binders, this is completely in the lid or the Housing half-shells integrated and does not have to be a further construction partly assembled. In addition, it acts on the half shells attached plug for connection to a signal line  as a closure for the shield housing, as this cannot be opened without removing the plug. It is however, it is also possible that the outer conductor cylindrical shells of the RF connector integral on a single half shell or molded onto a lid. In both versions can shape the design of the outer conductor cylinder shell be advantageously provided that the associated inner conductor of the RF connector on the electronic circuit board soldered inside the shield case at one end and with the other end in the outer conductor shell extends into it. This means that the otherwise necessary insulation Plastic sleeve between the inner conductor and the outer conductor Cylinder shell of the HF connector is not required because of a appropriate board holder within the shield housing a defined and predetermined relative location of the Outer conductor cylinder shell to the inner conductor ensured can be. According to the invention can be resolved on the board tied inner conductor to ensure attachment to the Have circuit board mounting sections that are assigned in Engage openings in the board and there to manufacture a mechanical and electrical connection are soldered.

The principle of forming at least parts of the connector the covers or the half-shells of the housing can be prinzi apply to all connectors and is therefore not open a specific coax connector or a specific coax Socket limited. For example, it is also possible to an assigned sheet metal forming a thread on the outer line to provide the cylinder shell.

As already explained above for the frame, it can also one of the half shells a row of side by side and arranged transversely to a longitudinal extension of an edge web and have equidistantly spaced contact pins that with a common web are connected, the web on the Housing half-shell is attached. This can in particular achieved that contacting the electronic Circuit in the shielding housing is facilitated in that  the contact pins stored in this way and their assigned solder contacts on the electronic circuit board automa are aligned. To provide a good solder Ability of the contact pins punched out of a sheet should the housing half-shell provided with the contact pins or the galvanized frame with the contact pins after forming become.

The bridge or the contact pins attached to it can be aligned so that the in the shielding board to be inserted during the insertion process at the assigned Solder holes are engaged with the contact pins and then the board is placed in the housing. So that's it Circuit board automatically placed in the housing and the contact pins inserted into the associated solder holes for soldering.

The geometric relationships can advantageously so be set that the contact pins by kinking the Web section with which the contact pins connecting Web connected to the housing half shell or to the frame is insertable into the assigned holes on the board are. After soldering in the contact pins, the bridge can be in one simple working step removed from all pins at the same time become.

Each contact pin is a cross to the longitudinal extension of the edge mapped recess running, can be after the one solder the contact pins into the one in the shield housing Switching can be achieved by bending the pins outwards, that each contact pin is distinguished by the in the edge web from the shielding housing to the outside concludes another circuit. Still is advantageous that these recesses in the formation of the Kon Clock pins on the half-shell or the frame are generated automatically be because a contact pin is part of its associated Recess is punched out material. The remaining Bridges between the individual recesses continue to offer protection for the contact pins.  

According to the invention, both a section of a cover and a section of a housing half-shell can also be formed that this extends into the shielding housing extends and with the electrical circuit on the board connectable, for example solderable. The lid or the Housing half-shell also takes on the Ab Shielding of circuit areas within the shield housing ses. The designated section can, for example, from the Lid or half-shell partially broken out or partially broken out be cut so that this is on the half shell or on Lid is still attached, however, towards the inside Formed board, for example, can be bent.

In a particularly advantageous embodiment, it is at the use of a thermoformable sheet material for the Lid or the housing half-shell possible, the designated Section without making openings in the lid or the housing half-shell also inside the shielding housing to provide shielding. The inside of the shield Drawn sections of the cover or the housing Half-shell thus practice one in terms of shielding Double function off.

The invention will hereinafter be described by describing some Embodiments with reference to the accompanying drawings explained, whereby

Fig. 1 shows an inventive RF shield case consisting of two housing half-shells,

Fig. 2 shows a part of a modified according to the invention ago conventional RF shield,

Fig. 3 shows a modified cover according to the invention of a conventional HF shielding housing, and

Figure 4 shows a conventional shield housing including an associated pin header and RF connector.

An embodiment of the invention with two housing half-shells len 2 a, 2 b, which form a substantially closed shielding housing 1 is shown in Fig. 1. The entirety of the shield housing including all of the molded parts shown in FIG. 1 is integrally formed from a single deep-drawn sheet. Both half-shells have a rectangular base 11 and four edge or side webs 14 to 17 , which together form a trough-shaped structure. The dimensions of the two half-shells are identical, whereby they are arranged along and aligned with one another along predetermined side webs. A fold 3 is attached to the edges of the opposing edge webs 17 , 15 for the foldable connection of the two housing half-shells. This fold, which consists of the same material as the housing half-shells due to the manufacturing process, cannot be bent as often as required, but is sufficiently elastic for normal use to enable repeated opening and closing. In another embodiment of the invention, the connecting means 3 is designed as a perforated web which breaks along the perforation when the two half-shells are folded onto one another.

Both half-shells have molded on the edge web 16 and extending outwardly extending half-cylindrical shell-shaped elements 5 a, 5 b, which together form the outer conductor shell of an F socket. The half-shell 2 b also has at the edge web 15 along its longitudinal extension ten contact pins 7 arranged side by side and equidistant, all of which are connected to one end 8 on a web 9 . At both ends of the web 9 , a connecting web 10 extends to the edge of the web 15 . The structure of the webs including the contact pins is punched out of a surface that is partially within the surface 6 of the edge web 15 , so that the edge web 15 has a reduced height in this area. The web 9 is bent with the contact pins 7 by 90 degrees to the edge web, so that the contact pins 7 with their second end 12 the edge web 15 protrude into the interior of the half-shell 2 b.

By means of deep-drawing forming shielding sections 13 extend from the half-shell bottom 11 of the half-shell 2 b into the interior of the half-shell, the sections 13 being solderable to the circuit board of the electronic circuit (not shown) and the circuit board thus additionally fixed within the shielding housing 1 is. The sections 13 are used primarily for shielding assigned areas of the electronic circuit within the shielding housing; depending on the application, they can also have a larger extension into the interior of the half-shells.

To connect the electronic circuit to the pins 7 , the web 9 is folded upward, so that the row of pins can be lowered onto the circuit board into an associated row of contact pin holes in which the pins are soldered. Thereafter, the webs 9 , 10 are removed from the pins and bent again with a special tool, so that the first end 8 of the pins 7 protrudes again from the shielding housing 1 for contacting an external electronic circuit. Plastic spacers between the individual pins 7 are therefore not necessary.

In another embodiment, the contact pins can also be angled to match the insertion of the contact pins nete solder holes on a board. The Board is brought up to the contact pins and moved so that the contact pins come into engagement with the solder holes. Then the board is placed in the half shell, whereby the contact pins are bent.

To provide the inner conductor in the outer conductor of the coax socket formed by the half-cylindrical elements 5 a, 5 b, a contact pin also produced by sheet metal forming is soldered onto the circuit board and arranged so that the pin is centered in the outer cylinder -Shell shell 5 b extends outwards.

FIG. 2 shows a frame 20 modified according to the invention, which forms the HF shielding housing in a conventional manner with two associated lids. The frame 20, including the parts molded onto the frame in FIG. 2, is integrally formed from a single sheet by stamping and forming processes. Due to the relative arrangement of four frame sides 21 to 24, the frame 20 has a rectangular base area. In a conventional manner, inner shielding plates 26 and associated contact pins 27 for contacting the circuit board are also arranged inside the frame. In contrast to the usual frame according to the prior art, the frame 20 according to the invention for a shielding housing has the series of contact pins 7 already described for the housing half-shell, the first end 8 of which has a web 9 which has two lateral connecting sections 10 , are connected to the upper edge 28 of the frame side 24 . The pins 7 are perpendicular to the frame side 24 and point with their second end 12 to the center of the frame. Due to the manufacturing process already described, the frame side 24 has a recess 25 assigned to each individual pin 7 . After the contacting of each pin 7 with the associated opening in the circuit board (not shown) has already been described, the contact pins are bent in such a way that they extend outward through the respective recess 25 . The recess 25 has an opening diameter which corresponds to approximately three times the contact pin width, so that from the edge of each contact pin 7 to the edge of the associated recess 25 there is a gap corresponding to the contact pin width, which is sufficient for insulation.

Fig. 3 shows a redesigned cover 30 according to the invention for a shielding housing consisting of two covers and a frame, in which the cover 30 at the edge 31 has an outwardly extending portion of an RF connector in the form of a shell-shaped element 5 a with a complementary shell-shaped element on the second cover, not shown, together forms the outer conductor of a coaxial connector. In another embodiment, it is provided that part of the shell-shaped outer conductor of the RF connector is arranged on the frame, so that both the lid and the frame have sections of the cylindrical outer conductor.

LIST OF REFERENCE NUMBERS

1

RF shielding

2

a,

2

b Housing half shells

3

Connection means of the housing half-shells

5

a,

5

b half-cylinder-shaped element

6

Area of the edge web

15

7

contact pin

8th

first end of the contact pin

9

web

10

Connection section of the web to the edge web

11

Housing half-shell bottom

12

second end of the contact pin

13

shield portions

14

.

15

Edge web, side web of the housing half-shells

16

.

17

Edge web, side web of the housing half-shells

20

frame

21

.

22

frame sides

23

.

24

frame sides

25

recesses

26

inner shielding plate

27

contact pins

28

upper edge of the frame side

24

30

cover

31

cover edge

40

frame

41

.

42

cover

43

Coaxial socket

44

pin header

45

shield

46

pin

47

cover edge

Claims (27)

1. RF shielding housing, in particular tuner housing, for receiving an electronic circuit, with two from the shield housing ( 1 ) forming housing half-shells ( 2 a, 2 b), characterized in that at least one of the housing half-shells ( 2 b, 2 b) at least one section ( 5 a, 5 b) of an outer conductor cylinder shell of an RF connector on an edge web ( 16 ), the at least one portion of an outer conductor cylinder shell of the RF connector integrally on the housing half shell ( 2 a, 2 b), in particular formed from a single sheet metal part. 2. RF shielding housing ( 1 ) according to claim 1, characterized in that the two housing half-shells ( 2 a, 2 b) on an edge web ( 15 , 17 ) by a connecting means ( 3 ) are connected to each other collapsible, both Housing half-shells ( 2 a, 2 b) including the connecting means ( 3 ) are integrally formed, in particular from a single sheet metal part. 3. RF shielding housing ( 1 ) according to one of claims 1 or 2, characterized in that an outer uter conductor cylinder shell of a coax connector is integrally formed on a Ge half shell. 4. RF shielding housing according to one of claims 1 to 3, characterized in that both Ge housing half-shells ( 2 a, 2 b) an outwardly emerging, semi-cylindrical shell-shaped element ( 5 a, 5 b) as a section of an RF Have connector, wherein the elements ( 5 a, 5 b) on the two housing half-shells ( 2 a, 2 b) are formed so that the half-cylindrical shell-shaped elements in the assembled state of the housing half-shells the outer conductor cylinder shell of the RF connector form. 5. RF shielding housing according to one of claims 3 or 4, characterized in that the outside ladder cylinder shell using sheet metal forming with egg is provided with a thread. 6. RF shielding housing according to one of claims 1 to 5, characterized in that a itself at least in sections in the outer conductor cylinder shell extending sheet metal part for providing a Inner conductor of the RF connector in the shielding se insertable electronic circuit is attachable. 7. RF shielding housing according to one of claims 1 to 6, characterized in that a Ge half-shell ( 2 b) on an edge web ( 15 ) has a number of juxtaposed and equidistantly spaced Kon contact pins ( 7 ), each on a first end ( 8 ) is connected to a common web ( 9 ), the web ( 9 ) being connected to the edge web ( 15 ). 8. RF shielding housing according to claim 7, characterized in that the web ( 9 ) at both ends of its longitudinal extent each has a perpendicularly extending connecting portion ( 10 ) which extends to the edge of the edge web ( 15 ) and with it this is connected, and the contact pins ( 7 ) with their other end ( 12 ) are exposed, and are integral with the web ( 9 ) and the housing half-shell ( 2 b) Herge provides. 9. RF shielding housing according to one of claims 7 or 8, characterized in that in the edge web ( 15 ) each contact pin ( 7 ) is assigned a transverse to the longitudinal extension of the edge web recess, the plane formed by the contact pins ( 7 ) can be folded by bending the web ( 9 ) into the edge web ( 15 ), whereby the contact pins can be folded into the associated recesses. 10. RF shielding housing according to one of claims 1 to 9, characterized in that a Ge half-shell ( 2 b) at least one from the half-shell lenboden ( 11 ) extending as far inward and around shaped portion ( 13 ) that this can be connected directly to the electronic circuit, in particular can be soldered ver. 11. RF shielding housing according to claim 10, characterized in that the at least one section from the half-shell base ( 11 ) is broken out. 12. RF shielding housing according to claim 10, characterized in that the at least one section is formed by means of a deep-drawing process from the half-shell base ( 11 ). 13. HF shielding housing, in particular a tuner housing, made of a metal sheet for receiving an electrical circuit, comprising:

• - A frame made by sheet metal forming from a single sheet;
• - two lids produced by sheet metal forming,

characterized in that the frame on at least one of its frame sides ( 24 ) has a series of juxtaposed and equidistantly spaced contact pins ( 7 ), each connected at a first end ( 8 ) to a common web ( 9 ), the Web is connected to the frame side ( 24 ). 14. RF shielding housing according to claim 13, characterized in that the web ( 9 ) at both ends of its longitudinal extent each has a perpendicularly extending connecting portion ( 10 ) which extends to the edge of the frame side ( 24 ) and with it this is connected, and the contact pins ( 7 ) are exposed at their other end ( 12 ), and are produced integrally with the web ( 9 ) and the frame ( 20 ). 15. RF shielding housing according to claim 13 or 14, characterized in that in the frame side ( 24 ) each contact pin ( 7 ) a transverse to the longitudinal extension of the frame side ( 24 ) extending recesses ( 25 ) is assigned, the through the contact pins ( 7 ) formed level by bending the web ( 9 ) in the frame side ( 24 ) can be folded, whereby the contact pins ( 7 ) can be folded into the associated recesses ( 25 ). 16. RF shielding housing, in particular a tuner housing, made of a metal sheet for receiving an electrical circuit, comprising:
a frame formed by sheet metal forming from a single sheet;
two lids produced by sheet metal forming and attachable to the frame, which can be fastened to the frame,
characterized in that at least one cover ( 30 ) at the edge ( 31 ) has at least a portion ( 5 a) of an outer conductor cylinder shell of an RF connector, the at least one portion of an outer conductor cylinder shell of the RF connector integrally on the lid ( 30 ) is formed from a single sheet metal part. 17. RF shielding housing according to claim 16, characterized in that an Au outer conductor cylinder shell of a coax connector on the cover is integrally formed. 18. RF shielding housing according to claim 16, characterized in that both De a semi-cylinder extending outwards shell-shaped element as a section of an outer conductor Have cylinder shell of an RF connector and in the brought condition of the lids to the frame together the au Form the outer conductor cylinder shell of the RF connector. 19. RF shielding housing according to one of claims 16, 17 or 18, characterized in that the outside ladder cylinder by means of sheet metal forming with a Ge winch is provided. 20. RF shielding housing according to one of claims 16 to 19, characterized in that a itself at least in sections in the outer conductor cylinder shell extending sheet metal part for providing a  Inner conductor of the RF connector in the shielding se insertable electronic circuit is attachable. 21. HF shielding housing, in particular a tuner housing, made of a metal sheet for receiving an electrical circuit, comprising:
a frame formed by sheet metal forming from a single sheet;
two lids produced by sheet metal forming and attachable to the frame, which can be fastened to the frame,
characterized in that a cover has at least one formed from the cover surface inwardly extending and deformed shielding section that it can be directly connected to the electrical circuit, in particular solderable. 22. RF shielding housing according to claim 21, characterized in that the too at least one shielding section from the cover surface has broken out. 23. RF shielding housing according to claim 21, characterized in that the too at least one shielding section by means of a deep drawing molding process is formed from the lid surface. 24. Frame for an RF shield housing according to one of the claims 13 to 15 and / or cover for a shield housing according to ei nem of claims 16 to 23. 25. A method for producing an HF shielding housing according to one of claims 1 to 23, characterized in that an HF connector is integrated at least in sections on the shielding housing, in particular on at least one cover ( 30 ) or a half-shell ( 2 a, 2 b) is molded. 26. A method for producing an RF shielding housing according to one of claims 1 to 23, characterized in that on the frame ( 20 ) or on a housing half-shell ( 2 b) a series of adjacent and equidistantly spaced contact pins ( 7 ) integral is formed, each of changes of egg nem first end (8) with a common web (9) are connected, the web with the frame or the Gehäu se half-shell is connected. 27. A method for producing an RF shielding housing according to one of claims 1 to 23, characterized in that at least one shielding section ( 13 ) from the bottom of a housing half-shell ( 5 b) or a cover ( 30 ) extends as far as the inside is reshaped that the Abschirmab section can be connected directly to the electronic circuit, in particular is solderable.