Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
2000-06-06
2002-03-19
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
C174S034000, C361S818000
Reexamination Certificate
active
06359215
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an elastomer device for preventing electromagnetic interference of a computer central processing unit, and especially to an elastomer device in which an elastic conductive piece may be pressed without breaking.
BACKGROUND OF THE INVENTION
In the prior art for preventing electromagnetic interference in a computer mother board, a hollow cover is placed at the connection between the microprocessor and memory using a conductive sponge.
However, the cost of the conductive sponge is high, and manual installation is required. This increases the cost of assembly and makes the assembly work, itself, more difficult.
In another prior art approach, an elastic conductive piece is used in place of the conductive sponge in preventing electromagnetic interference. As shown in
FIGS. 1
to
5
, a contact surface
61
is formed in the elastic conductive piece
60
. From an outer lateral side of the contact surface
61
, piece
60
extends downward and bends to form a plate
62
. A first arc portion R
1
is thus formed between the plates
61
,
62
. The central portion of the first arc portion R
1
is punched with a groove
64
. From the two lateral sides of the first arc portion R
1
, piece
60
is bent downward and extended to form respective lateral plates
62
. The distal end of the plates
62
extend downward to form a second arc portion R
2
and a welding surface
63
extending therefrom. The inner surface of the second arc portion R
2
is of opposite orientation from the inner surface of the first arc portion R
1
. The welding surface
63
is coupled to a computer mother board
80
with a tin glue material
70
.
The elastic conductive piece
60
is generally of sufficient elasticity, conductivity, low impedance, and resistance to oxidation to yield a useful product. However, since the tin glue material
70
is an adhesive glue material, the tin glue
70
hardens to join the elastic conductive piece and the computer mother board. When the elastic conductive piece is subjected to a stress force, the stress is applied at the tin glue joint and the second arc portion of the elastic conductive piece
60
, as shown by the arrow of FIG.
5
. It is thus very possible that if enough force is applied to the elastic conductive piece, it will break.
Therefore, there is a need for a novel device that serves to prevent electromagnetic interference of a computer central processing unit and remedies the shortcomings of the prior art.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the prevent invention is to provide an elastomer device for preventing electromagnetic interference of a computer circuit processing unit. An enhancing portion is bent inwards between a second arc portion and a welding surface such that as the elastic conductive piece is pressed downwards, breakage is avoided.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended Drawings.
REFERENCES:
patent: 5043528 (1991-08-01), Mohr
patent: 5600092 (1997-02-01), Patscheck et al.
patent: 5672844 (1997-09-01), Persson et al.
patent: 5833480 (1998-11-01), Austin
patent: 5934916 (1999-08-01), Latal et al.
Oliva Carmelo
Reichard Dean A.
Rosenberg , Klein & Lee
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