Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent
1998-06-30
2000-10-24
Cuchlinski, Jr., William A.
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
174 35MS, 174 51, 295275, 361753, 361816, 361818, H05K 900
Patent
active
061370509
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is directed to a method for manufacturing housing parts with EMI shielding effect for a radio device. The housing parts are shell shaped and having their open sides facing toward one another and lying on one another, said housing parts serving the purpose of accepting the radio device when the radio device is installed in the housing.
BACKGROUND OF THE INVENTION
A shield for protection against noise emission and noise transmission of electromagnetic radiation is required in radio devices, such as mobile radiotelephone or, respectively, cordless telephone sets, for protection of the radiofrequency and low-frequency logic assemblies. Soldered shielding frames, shielding plates, metallized plastic housings, diecast housings, etc., can be employed in a known way for shielding. Such component parts increase the weight of the device, enlarge the device volume, make the device more expensive and are extremely fabrication-intensive due to numerous difficult assembly processes. The employment of metallized or galvanized plastic as housing parts is also complicated in fabrication terms since two completely separate work steps with different machine tools are required.
SUMMARY OF THE INVENTION
The invention is based on the object of manufacturing housing parts for a housing of the aforementioned type in a simple way, said housing parts exhibiting a good shielding effect.
For a housing part of the species initially described, this object is achieved in that a wire weave shaped to correspond to the inside contour of the housing part is introduced into an injection mold for the housing part. All contact surfaces of said wire weave is covered with a foil corresponding to the dimensions of the desired contact surface. The foil is removed after the subsequent injection molding process with an insulating material.
The fabrication-oriented problem of an additional production step is solved given the housing parts manufactured according to the present invention since the housing part can be manufactured in a single operation. Over and above this, the invention enables the omission of additional EMC seals that previously had to be either inserted in the assembly of the housing or, respectively, dispensed in an additional processing step.
DE 19 515 010.4 discloses a housing part wherein a foil is back-injected. However, the disadvantage exists given this known housing part that the foil cannot adapt to the existing, tight radii and the foil can therefore tear.
In an embodiment, the present invention provides a method for manufacturing a housing part with shielding function for a radio device, the housing part comprising a shell with an open side and a closed side comprising an inside surface defining an inside contour, the method comprising the following steps: providing the housing part; fitting a wire weave to the inside contour of the housing part, the wire weave comprising at least one surface intended to serve as an electrical contact surface having a length and a width and at least one other surface intended to be covered with insulating material; introducing the wire weave and housing part into an injection mold for the housing part and covering said at least one surface of the wire weave intended to serve as a contact surface with a foil having a length and a width corresponding to the length and width of the electrical contact surface; injecting an insulating material into the injection mold thereby covering the other surface of the wire weave and the foil with insulating material; and removing the foil and any insulating material disposed thereon.
In an embodiment, the foil is an adhesive foil.
In an embodiment, the at least one surface of the contact weave intended to serve as a contact surface provides a low-impedance contact.
In an embodiment, the wire weave includes a plurality of surfaces intended to serve as contact surfaces and a plurality of foils are therefore employed.
Other objects and advantages of the present invention will become apparent upon reading t
REFERENCES:
patent: 5150282 (1992-09-01), Tomura et al.
patent: 5226210 (1993-07-01), Koskenmaki et al.
patent: 5243126 (1993-09-01), Chow et al.
patent: 5731963 (1998-03-01), Heiss et al.
Cuchlinski Jr. William A.
Mancho Ronnie
Siemens Aktiengesellschaft
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