Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
1999-05-06
2001-08-14
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
C174S034000, C361S816000, C361S752000
Reexamination Certificate
active
06274808
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to shielding of electromagnetic interference (EMI). More particularly, the present invention relates to a snap-in enclosure for shielding (EMI) from electronic equipment.
2. Description of Related Art
Electronic equipment is often sensitive to physical contact as well as electromagnetic fields. For example, electronic equipment which operates at a radio frequency (r.f) level is very susceptible to EMI from radio frequency fields. Accordingly, EMI sensitive electronic equipment is usually enclosed within a housing which protects the electronic equipment from physical contact and from EMI. In addition, electronic equipment which produces EMI may also be enclosed within a housing to protect adjacent EMI sensitive electronic equipment.
It is often necessary to provide enclosures on a circuit board in order to protect various pieces of electronic equipment mounted on the circuit board. Enclosures of this type are usually made of a material which either reflects or absorbs electromagnetic radiation. These housings usually include some type of a mechanical fastener for opening and closing the housing to gain access to the electronic equipment inside. Mechanical fasteners such as threaded fasteners provide a sufficient connection between parts; however, access to the electronic equipment is very time consuming which increases the cost of repair. The threaded fasteners must be detached and then reattached once repairs are completed.
Accordingly, there is a need for an enclosure which protects electronic equipment from EMI and which allows quick access to the electronic equipment without having to detach numerous mechanical fasteners.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an alternative technique for shielding electronic equipment from EMI which makes up for the above-mentioned deficiencies.
It is another object of the present invention to decrease the time required to gain access to the electronic equipment in order to decrease the cost of electronic equipment manufacture, repair and testing.
It is yet another object of the present invention to provide an enclosure which can be made in small and large sizes and in various shapes to accommodate numerous applications.
These and other objects of the present invention are fulfilled by providing an enclosure for protecting electronic equipment from electromagnetic interference comprising a base made of an EMI absorbing or reflecting material which includes a plurality of fastening elements and at least one securing element formed thereon. Furthermore, a cover made of an EMI absorbing or reflecting material includes at least one securing element formed thereon for engaging with the securing element on the base.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 5354951 (1994-10-01), Lange, Sr. et al.
patent: 5436802 (1995-07-01), Trahan et al.
patent: 5565656 (1996-10-01), Mottahed
Cercioglu Nuri Murat
Mottahed Behzad Davachi
Picot Walter J.
Birch & Stewart Kolasch & Birch, LLP
Lucent Technologies - Inc.
Ngo Hung V
Reichard Dean A.
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