WO2001082669A1

WO2001082669A1 - Shielding compartment

Info

Publication number: WO2001082669A1
Application number: PCT/DE2001/001218
Authority: WO
Inventors: Raimund Stetter-Alle; Peter Holl; Helmut Riesenegger
Original assignee: Siemens Aktiengesellschaft
Priority date: 2000-04-25
Filing date: 2001-03-29
Publication date: 2001-11-01
Also published as: EP1277379A1; CN1436440A; KR20020089526A

Abstract

The invention relates to a shielding compartment for shielding a circuit on a printed circuit board, which in its mounted state covers the circuit on said printed circuit board, said shielding compartment opening towards the printed circuit board. The shielding compartment has a plastic shield frame which in its mounted state, is located on the printed circuit board and extends around the circuit to be shielded; and a shield lid which is fixed to said shield frame.

Description

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coefficient of the circuit board is what can lead to a distortion of the circuit board after soldering.

It is an object of the present invention to provide an alternative to this prior art.

This object is achieved in that the shielding chamber has a plastic shielding frame which runs around the circuit to be shielded and which is fastened to the printed circuit board, and a shielding cover fastened to the shielding frame.

An RF-tight chamber is formed by the shield frame and the attached shield cover, which shields the layout area equipped with components on the covered printed circuit board. This means that the shielding chamber is in two parts in the present case, the plastic shielding frame providing the side shielding and the shielding cover covering the circuit upwards. In order to achieve the shielding effect, the screen frame can be made of a metallized thermoplastic, for example. But it can also be a conductive plastic.

The use of a plastic screen frame has the advantage that the linear expansion coefficient is in the order of magnitude of the printed circuit board and therefore less distortion of the printed circuit board can be expected after soldering.

By metallizing the frame on the outer walls it can be achieved that the frame - like the conventional metal shield chambers - can be soldered onto a shield trace, usually a gold trace, on the circuit board. The soldering can by various methods such as beispiels- with reflow soldering or similar methods, _^ be performed. Due to the two-part shape, it is initially possible to attach only the screen frame to the circuit board, the screen cover not yet being attached. An automatic optical inspection of the circuit is therefore also possible after the soldering process.

The screen frame preferably has a separating web which divides the screen chamber into subchambers. This separator is part of the screen frame and is preferably made in one piece with the outer frame. In this way, different layout areas can be shielded separately from one screen frame. Of course, the screen frame for producing any number of subchambers can have any number of such dividers in any arrangement and with any course.

There is the possibility to use a one-piece screen cover, which covers several Teilka mern. Alternatively, several separate screen covers covering the individual subchambers can be used, which adjoin one another at the separating webs. Of course, any variable intermediate solution is also possible, so that, for example, several adjoining subchambers have a common screen cover and some special subchambers have a separate screen cover.

The construction with such dividers to subdivide a shielding chamber into several subchambers also has the advantage that only one shielding trace is required on the printed circuit board to delimit two areas shielded separately from one another, onto which the separating web can be soldered. In contrast, in the conventional method with a plurality of chambers arranged side by side, two parallel screen tracks are required. The shielding according to the invention thus leads to better use of space on the circuit board. - In a particularly preferred embodiment, the screen cover is detachably attached to the screen frame. This has the advantage that the shield chamber can be opened at any time for repair or inspection without having to remove the entire shield chamber from the circuit board. In the case of the umbrella technology mentioned at the outset, on the other hand, repairs are difficult or often not possible at all, or are too complex to be carried out economically. This leads to an increased scrap. The use of individual removable shield covers for different subchambers offers the additional advantage that only the chamber to be repaired has to be opened in each case.

The releasable attachment is preferably realized in that the screen cover and the screen frame have interacting clamping and / or latching elements.

The shield cover itself is made of metal, for example, preferably as a stamped and bent part in one piece with the necessary clamping and / or locking elements made of sheet metal.

The clamping and / or latching elements can be, for example, slots, pockets or indentations arranged in the frame, into which the shield cover placed on the frame engages or claws.

The metallization of the screen frame or the use of a conductive plastic for the screen frame automatically ensures good electrical contact between the screen cover and frame.

In a further preferred exemplary embodiment, the screen frame has one or possibly several openings in the edge facing the printed circuit board. In particular, this can also involve a plurality of regular openings, each arranged at a fixed distance from one another. In this case, the framework is centering, ie partially exempted from the base. Accordingly, an intermittent gold trace is then applied to the printed circuit board and the screen frame is soldered onto the printed circuit board only at these points. This measure contains advantages in terms of layout, since various lines can be routed out of the shielding chamber or from shielding chamber to shielding chamber on the circuit board surface or on the upper layer. Accordingly, of course, not only the outer frame of the screen frame, but also the dividers are provided with recesses.

In principle, almost any shape can be represented on the printed circuit board by means of a plastic screen frame. The essentially flat screen covers can be designed so that they can follow any shape. This results in a much greater degree of design freedom in the layout of the printed circuit board than in the previous shielding methods, so that for this reason too, better use of space and overall better performance of the overall system in terms of arrangement and shielding effect can be achieved. In particular, it is possible to build smaller and more compact devices, which achieves higher integration.

The invention is explained below with reference to the accompanying drawings using exemplary embodiments. The features shown there and the features already described above can be essential to the invention not only in the combinations mentioned, but also individually or in other combinations. Show it:

1 shows a perspective view of a printed circuit board with a screen frame arranged thereon with two partial chambers and with a common screen cover in the non-locked position; FIG. 2 shows a perspective view according to FIG. 1, but with the shield cover closed;

FIG. 3 shows a perspective enlarged view of a corner section of a screen chamber with a screen frame with periodically arranged recesses in the base area and non-latched screen cover arranged above it;

4 shows a perspective view according to FIG. 3, but with the shield cover closed.

To manufacture the shielding chambers 1 according to the invention shown in the figures, a shielding frame 3 which is appropriately adapted to the circuit layout is first produced from plastic, for example from a thermoplastic. As can be seen in particular in the enlarged representation according to FIG. 3, suitable recesses 11 or indentations in the form of slots or pockets are made in the upper edge 9 of the screen frame 3 at periodic intervals. For example, production can be carried out inexpensively in an injection molding process, the recesses 11 being able to be molded in at the same time.

Corresponding to the shape of the screen frame 3, a screen cover 4 is produced from a sheet metal using the stamping and bending process and has a plurality of tongues 8 bent over on the outer edges 7 in the direction of the .. screen frame 3. These tongues 8 are arranged so that they engage exactly in the recesses 11 in the upper edge 9 of the screen frame 3.

The recesses 11 in the upper edge 9 of the screen frame 3 create a counter surface to the tongues 8 of the screen cover 4, with the aid of which the screen cover 4 can be securely snapped or snapped into the screen frame 3. Since the screen frame 3 is metallized overall after production, contacting between the screen cover 4 and the screen frame 3 is also automatically ensured. The cυ cυ> MF ¹ F ¹

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Claims

claims

1. shielding chamber (1) for shielding a circuit on a printed circuit board (2), the shielding chamber (1) which is open towards the printed circuit board (2) covering the circuit arranged on the printed circuit board (2) in the assembled state, characterized in that the shielding chamber (1) has a plastic screen frame (3) running around the circuit to be shielded and arranged on the circuit board (2) and a screen cover (4) attached to the screen frame (3).

2. Shielding chamber according to claim 1, characterized in that the shielding frame (3) has a separating web which divides the shielding chamber (1) into partial chambers (5, 6).

3. screen chamber according to claim 2, characterized by a one-piece screen cover (1) which covers several of the subchambers (5, 6).

4. Screen chamber according to claim 2 or 3, characterized by several separate screen covers covering the individual partial chambers.

5. Screen chamber according to one of claims 1 to 4, characterized in that the screen cover (4) is detachably attached to the screen frame (3).

6. Screening chamber according to claim 5, characterized in that the screen cover (4) and the screen frame (3) have interacting clamping and / or locking elements (8, 11).

7. umbrella chamber according to claim 6, characterized in that the umbrella frame (3) in and / or on one of the

Printed circuit board (2) opposite the upper edge (9) has recesses (11) into which for fastening the screen cover engage the tongues (8) on the shield cover (4).

8. screen chamber according to one of claims 1 to 7, characterized in that the screen frame (3) is metallized.

9. Screen chamber according to one of claims 1 to 8, characterized in that the screen frame consists of a conductive plastic.

10. shielding chamber according to one of claims 1 to 9, characterized in that the shield cover (4) is made of sheet metal.

11. Screening chamber according to one of claims 1 to 10, characterized in that the screen frame (3) has an opening (13) in an edge (10) facing the printed circuit board (2).

12. Printed circuit board (2) with a shielding chamber (1) according to one of claims 1 to 11.

13. Printed circuit board according to claim 12, characterized in that the screen frame (3) with its to the printed circuit board

(2) facing edge is soldered at least in sections onto a screen trace (14) arranged on the printed circuit board (2).

14. Communication terminal with a circuit board (2) according to claim 12 or 13.