Shielding housing and a method of producing a shielding housing

Details Shielding housing and a method of producing a shielding housing Shielding housing and a method of producing a shielding housing

1998-04-15

2001-01-23

Maung, Nay (Department: 2744)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C361S818000, C361S816000, C174S034000, C174S657000, C455S090300

Reexamination Certificate

active

06178318

ABSTRACT:

TECHNICAL FIELD
The invention relates to a shielding housing for electrically shielding one or more components on a printed circuit board as well as to a method of producing such a shielding housing.
BACKGROUND
To prevent components in electronic equipment, e.g. mobile phones, from transmitting unwanted high-frequency signals that may interfere with other electronic equipment or vice versa, i.e. to prevent other electronic equipment from interfering with components in mobile phones, such components have to be electrically shielded. Moreover, such a shielding is necessary in order for the equipment to comply with electromagnetic compatibility (EMC) requirements.
Today, soldered shielding cans or housings are used to shield critical components on a printed circuit board. The shielding cans are soldered to conductors on the printed circuit board to cover the critical components.
However, it is often necessary to test the components located under the shielding cans. Such tests have to be carried out both during production stages and at after-sales services.
Shielding cans soldered to printed circuit boards are difficult to remove and replace in connection with such tests and services.
SUMMARY
The object of the invention is to bring about a shielding housing which is easy to mount and dismount, and which is inexpensive to produce and inexpensive to replace.
This is attained in that the shielding housing in accordance with the invention, is made of an inexpensive non-shielding material or semi-shielding/semi-conducting material, e.g. a plastic material, with or without conductive fillers such as graphite and metal fibers, and has at least one cavity for receiving the components to be shielded. Along the rim of the cavity, an elastic gasket is provided. The gasket as well as the inner and/or outer surface of the housing is covered by an electrically shielding material, e.g. a conductive paint, a metallization or a metal foil. The shielding housing according to the invention is intended to be pressed, i.e. not soldered, with its gasket against a conductor which is provided around the components to be shielded.
Hereby, the shielding housing will be easy to mount and dismount. Since the shielding housing according to the invention is made of inexpensive material, it is inexpensive to produce.


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