EMI shield

Details EMI shield EMI shield

1999-02-03

2001-05-08

Sircus, Brian (Department: 2839)

Electrical connectors

With vitreous-type envelope

Having bayonet-coupling contact

C439S607070

Reexamination Certificate

active

06227910

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an EMI shield, and more particularly to an EMI shield which can be easily assembled to a connector while providing enhanced shielding capabilities thereto.
DESCRIPTION OF PRIOR ART
As the speed of signal transmission through a cable assembly increases, the need to isolate and protect signals from electrical noise becomes important. One existing method of achieving this is by using an EMI shield assembled to a housing of a connector.
An EMI shield is typically assembled to outer walls of a housing. Assembling the EMI shield to inner walls of the housing is another alternative. In some applications, such as an offset ultra SCSI connector, the EMI shield is molded with a connector core by an over-molding process. During the over-molding process, the flow of molten plastic may cause conductive wires to become easily disengaged from insulation displacement sections resulting in electrical disconnection therebetween. U.S. Pat. No. 5,766,033 issued to Davis on Jun. 16, 1998 discloses an electrical connector having insulation displacement sections on a common side. A pair of termination covers having latching arms is assembled to a housing of the connector. However, engagement between the latching arms and the housing can not sustain the pressure from the flow of molten plastic. When the termination covers are loosened, connections between conductive wires and insulation displacement sections become vulnerable to disengagement. A shell member includes a shroud and an integrally formed base. The asymmetric arrangement of the components complicates formation of the shell member.
Referring to
FIG. 1A
, a shroud
90
is drawn through a central portion of a metal sheet
9
. After the shroud
90
is drawn, a left portion
91
of the metal sheet
9
is cut off (
FIG. 1B
) and a right portion
92
is used to form a base. Manufacturing costs are increased due to the excess waste produced by the left section
91
. However, if a shroud
90
A is drawn from a metal sheet
9
A having the left section
91
A cut off therefrom in advance, as shown in
FIG. 1C
, formation of the shroud
90
A becomes difficult because the left section
91
A is too small to be effectively retained by a fixture. Furthermore, the left section
91
A will be deformed during the formation process since the material is drawn therefrom.
A shroud of limited thickness facilitates mating with a complementary shroud of a plug connector. However, a thick base facilitates EMI shielding. If the metal sheet is relatively thick, formation of the shroud becomes difficult and burrs are easily formed on an edge
94
of the shroud
90
(
FIG. 1D
) when an opening is formed therein. In addition, if the shroud
90
is too rigid, insertion of the complementary plug becomes difficult. If the metal sheet is relatively thin, EMI shielding will be inadequate. If the shroud
90
can be made from a thin metal sheet and the base can be made from a relatively thicker metal sheet, the manufacturing process will be simplified and the shielding effectiveness thereof will be enhanced.
SUMMARY OF THE INVENTION
An objective of the present invention is to provide an EMI shield having individually manufactured shroud and bottom sections.
In order to achieve the objective set forth, an EMI shield in accordance with the present invention comprises a base section having a planar wall. End tabs upwardly extend from opposite ends of the planar wall and each tab defines a window for engaging with a wedge of a carrier of a connector core. A shroud section is assembled to the base section. Interengaging means is arranged between the base and shroud sections for assembling the shroud section to the base section. The interengaging means includes at least a latch formed on one of the shroud and base sections. At least a clip is formed on another of the shroud and base sections.
These and additional objects, features, and advantages of the present invention will become apparent after reading the following detailed description of the preferred embodiment of the invention taken in conjunction with the appended drawing.


REFERENCES:
patent: 4653836 (1987-03-01), Peele
patent: 4689723 (1987-08-01), Myers et al.
patent: 5055070 (1991-10-01), Plegge et al.
patent: 5358428 (1994-10-01), Bixler et al.
patent: 5518421 (1996-05-01), Davis

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