Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2001-11-16
2002-10-22
Gandhi, Jayprakash N. (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S752000, C361S759000, C361S800000, C361S801000, C361S818000, C174S034000
Reexamination Certificate
active
06469912
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an electrical apparatus, more particularly to an electrical apparatus having a cover member that is adapted to provide electromagnetic interference shielding to an electronic component.
DESCRIPTION OF THE RELATED ART
The design of notebook computers has a current trend toward compactness. In order to ensure enhanced performance for a notebook computer, an expandsion slot for additional memory modules can be found in the notebook computer. Memory modules are getting smaller in size. At present, the specifications of 144-pin and 0.8-mm pin distance for a SODIMM memory are now being replaced by 200-pin and 0.6-mm pin distance. Therefore, it is important to provide electromagnetic interference shielding to a memory module especially during high-frequency operation.
FIG. 1
illustrates a conventional notebook computer that includes housing
1
and a cover member
2
. The housing
1
has a circuit board
12
received therein. The circuit board
12
is mounted removably with a memory module
13
thereon via a slot
121
that is mounted on the circuit board
12
. With further reference to
FIG. 2
, the circuit board
12
has a set of ground contacts
122
, such as solder pads, that are disposed around the slot
121
on the circuit board
12
. Each of the ground contacts
122
is provided with a resilient hook-shaped conductive piece
123
that is soldered thereon. The housing
1
further has a wall portion
10
formed with an access opening
11
to permit access to the memory module
13
on the circuit board
12
. The wall portion
10
has an inner surface with a conductive first grounding plate
111
mounted thereon. The first grounding plate
111
is formed with a flange
112
that extends radially and inwardly relative to the access opening
11
. The flange
112
contacts directly the conductive piece
123
so as to establish electrical contact with the ground contacts
122
. The cover member
2
includes a dielectric cover plate
20
mounted detachably on the housing
1
so as to cover the access opening
11
. The cover plate
20
has an inner surface with a conductive second grounding plate
21
mounted thereon. The second grounding plate
21
is provided with a set of contacts
211
that extend through the access opening
11
so as to establish electrical contact with the flange
112
of the first grounding plate
111
when the cover member
2
covers the access opening
11
. As such, the contacts
211
of the second grounding plate
21
establish electrical contact with the ground contacts
122
via the flange
112
of the first grounding plate
111
and the conductive pieces
123
. Therefore, the ground contacts
122
, the flange
112
and the contacts
211
can cooperate to provide electromagnetic interference shielding to the memory module
13
.
The following are some of the drawbacks of the aforesaid conventional notebook computer:
1. Due to the use of the conductive pieces
123
that are soldered to the ground contacts
122
, the requisite material and additional soldering process for the conductive pieces
123
result in higher costs.
2. Since the conductive pieces
123
are hook-shaped, the conductive pieces
123
are easily deformed during assembly such that the conductive pieces
123
cannot provide good electrical contact with the flange
112
of the first grounding plate
111
, thereby resulting in inferior electromagnetic interference shielding.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide an electrical apparatus having a cover member that is adapted to provide superior electromagnetic interference shielding to an electronic component without incurring a substantial increase in costs.
According to the present invention, an electrical apparatus comprises:
a housing having a circuit board received therein, the circuit board being adapted to be mounted removably with an electronic component thereon, and having a set of ground contacts that are disposed around the electronic component on the circuit board, the housing further having a wall portion formed with an access opening to permit access to the electronic component on the circuit board, the wall portion having an inner surface with a conductive first grounding plate mounted thereon, the first grounding plate being formed with a flange that extends radially and inwardly relative to the access opening; and
a cover member including a dielectric cover plate mounted detachably on the housing so as to cover the access opening, the cover plate having an inner surface with a conductive second grounding plate mounted thereon, the second grounding plate being provided with a set of first contacts that extend through the access opening so as to establish electrical contact with the flange of the first grounding plate when the cover member covers the access opening, the second grounding plate being further provided with a set of second contacts that extend into the housing via the access opening so as to establish electrical contact with the ground contacts on the circuit board when the cover member covers the access opening;
the ground contacts, the flange, and the first and second contacts cooperating to provide electromagnetic interference shielding to the electronic component.
REFERENCES:
patent: 5508889 (1996-04-01), Ii
patent: 5748455 (1998-05-01), Phillips et al.
Compal Electronics Inc.
Foley & Lardner
Gandhi Jayprakash N.
LandOfFree
Electrical apparatus having a cover member adapted to... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrical apparatus having a cover member adapted to..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical apparatus having a cover member adapted to... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2984193