EP0407072A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A method of shielding a printed circuit board, or a part of it, from disturbances caused by electromagnetic interference, and a shielding housing to be used in the method
Assignee: Nokia Oyj
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Filing: 1990-06-22
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Granted: —
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Expires: 2010-06-22
Abstract
Abstract The invention relates to a method and a shielding housing for shielding a printed circuit board, or a part of it, from disturbances caused by electromagnetic interference (EMI). In the method, in the manufacturing phase of the printed circuit board there are cut in the board slots (U) through the printed circuit board (pc), the length of the slots being L. The first part (2) of the housing is soldered to the printed circuit board (pc) in such a way that it approximately interconnects the ends of the cut slots (U). This first part constitutes one side wall of the shielding housing. The second part (1) of the shielding housing is made up of a cover (5) and three side walls, in which there is formed an inside groove having a height which corresponds to the thickness of the printed circuit board. After the soldering of the components, this second part (1) is slipped on the printed circuit board so that the printed circuit part between the slits (U) cut in the printed circuit board will be left on the inside of the side walls (7, 7 , 7 ) of the second part (1) and will bear on the inside grooves of the inner walls. The first part (2) and the second part (1) have locking means (3, 4) which lock the parts detachably to each other.
Inventors
- 👤 Pekka Lonka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:50
CPC Classifications
H; H05; H05K; H05K9/00; H05K9/0007; H05K9/002; H05K9/0022; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3447; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A shielding housing for shielding a printed circuit board, or a part of it, from disturbances caused by electromagnetic interference (EMI), characterized in that the shielding housing is made up of: a first part (2) which constitutes one separate shielding-housing end, the cross section of which is approximately a #profile and the ends of which have flanges (14) projecting perpendicularly from the center part (15) of the -profile, a second part (1) having a cover (5) and three sides abutting it and being at an angle to it, there being formed by means of successive bends (8, 9, 11; 8. 9', 11 8", 9 , 11 ) at those edges of the sides which are opposite in relation to the cover a flange-like inside groove the width of which corresponds to the thickness of the printed circuit board (pc), and in the cover (5) there is formed close to the open side a groove or ridge (3) parallel to it.
Claim 2
Dependent Claim
160 words
A shielding housing for shielding a printed circuit board, or a part of it, from disturbances caused by electromagnetic interference (EMI), characterized in that the shielding housing is made up of: a first part (2) which constitutes one separate shielding-housing end, the cross section of which is approximately a #profile and the ends of which have flanges (14) projecting perpendicularly from the center part (15) of the -profile, a second part (1) having a cover (5) and three sides abutting it and being at an angle to it, there being formed by means of successive bends (8, 9, 11; 8. 9', 11 8", 9 , 11 ) at those edges of the sides which are opposite in relation to the cover a flange-like inside groove the width of which corresponds to the thickness of the printed circuit board (pc), and in the cover (5) there is formed close to the open side a groove or ridge (3) parallel to it.
Claim 3
Dependent Claim
48 words
A shielding housing according to Claim 1, characterized in that in the middle part (15) of the -profile of the first part (2) there are apertures (16) to which filters can be attached for connecting the circuit to be protected to the rest of the printed circuit board.
Claim 4
Dependent Claim
54 words
A shielding housing according to Claim 2, characterized in that in one flange (12) of the I -profile there are made apertures (17) for facilitating its soldering to the printed circuit board and in the other flange (13) there is formed a ridge or groove (4) running in the longitudinal direction of the flange.
Claim 5
Dependent Claim
44 words
A shield housing according to Claim 3, characterized in that from the ends of one flange (12) of the -profile there project, perpendicularly from the flange, tabs (18) .which are intended for aligning the first part (2) with apertures in the printed circuit board.
Claim 6
Dependent Claim
67 words
A shielding housing according to Claim 1, characterized in that the lower edges (11, 11 11") of the side walls of the second part (1) of the shielding housing are bent in the orientation of the lower surface of the printed circuit board so that they partly overlap, whereby a continuous metal shield is formed on the lower surface of the printed circuit area to be shielded.
Claim 7
Independent Claim
243 words
A method for shielding a printed circuit board, or a part of it, from disturbances caused by electromagnetic interference (EMI), wherein the printed circuit board or its part is encased in a shielding housing which is in accordance with any of the above claims, characterized in that: in the printed circuit board (pc) there are cut, starting from the edge, one or several slots (U) through the board, the slots extending to a distance (L), determined by the area to be shielded, from the edge of the printed circuit board; the first part (2) of the shielding housing of the printed circuit board is fastened by one flange (12) of the profile; the second part (1) of the shielding housing is slipped over the printed circuit board in such a manner that the printed circuit part between the slots (U) cut in the printed circuit board, or the printed circuit part between the cut slot and the printed circuit board edge, will be left on the inside of the side walls (7, 7', 7") of the second part of the shielding housing and will bear on the flange-like grooves formed in the side walls, whereupon the flange (13) and the end flanges (14) of the first part (2) of the shield, attached to the printed circuit board, will come tightly against the inside 'surface of the second part (1) and the groove (4) is locked in a ridge (3) in the cover (5).
Claim 8
Dependent Claim
37 words
A method according to Claim 6, characterized in that the slots (U) through the printed circuit board are cut during the same process as the printed circuit beard (pc) is cut into shape by using a miller.
Claim 9
Dependent Claim
66 words
A method according to Claim 6, characterized in that the lower side of the printed circuit board is shielded using a separate metal or metallized sheet which attaches by its edges between a bend (11, 11 11 parallel to the lower surface of the printed circuit board, of the side wall grooves of the second part (1) of the shielding housing and the printed circuit board.
References Cited (Backward Citations)
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