Double-shielded connector

Details Double-shielded connector Double-shielded connector

1999-07-01

2001-02-27

Abrams, Neil (Department: 2839)

Electrical connectors

Electromagnetic or electrostatic shield

Shielding individually surrounding or interposed between...

Reexamination Certificate

active

06193554

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to an electrical connector, and in particular to a double-shielded connector having excellent properties for shielding against electromagnetic interference (EMI).
2. The Prior Art
An electrical connector connects two devices together and transmits signals therebetween. To ensure proper signal transmission, a connector is provided with a shielding means for preventing the connector from being adversely affected by external electromagnetic interference (EMI). Related examples are disclosed in Taiwan Patent Application Nos. 85204902, 85208558, 85212192, 85215759 and 86214118. However, the conventional shielding means cannot completely shield the connector thereby resulting in poor EMI protection.
FIGS. 1 and 2
of the attached drawings show a conventional connector having a shielding means. The connector includes an insulative casing
1
comprising two tongue plates
11
and a partition plate
12
separating the two tongue plates
11
which support contact elements (not labeled) thereon. The shielding means comprises a rear shielding plate
2
and a front shielding member The rear shielding plate
2
defines a plurality of frames
21
for engaging with barbs
13
formed on the casing
1
thereby retaining the rear shielding plate
2
on the casing
1
.
The front shielding member
3
comprises a housing
31
enclosing the casing
1
and having a plurality of resilient arms
312
stamped thereon thereby forming openings
311
associated with the arms
312
. The resilient arms
312
serve to electrically and mechanically engage mating connectors coupled to the connector. The front shielding member
3
further comprises a U-shaped inner housing
32
which is fit over the partition plate
12
and retained thereon for electrically isolating the contact elements of the tongue plates
11
. A number of resilient arms
322
are stamped on the inner housing
32
thereby forming openings
321
associated therewith.
However, the casing
1
is not completely shielded by the shielding means due to the openings
312
,
321
. Thus, proper signal transmission through the connector is not ensured.
Hence, it is desired to have an electrical connector providing excellent EMI protection.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an electrical connector having excellent EMI properties.
Another object of the present invention is to provide an electrical connector having a double-shielded structure for providing EMI protection.
To achieve the above objects, an electrical connector in accordance with the present invention comprises a casing defining at least one front receiving slot with a number of contact elements retained therein. The casing has two opposite side walls. Each side wall includes two wall segments spaced from and parallel to each other and defining a channel between the front receiving slot and a rear face of the casing. An inner shielding member is fit into and retained in each receiving slot. The inner shielding member has two rear extensions inserted into the channels. An outer shielding member encloses the casing and has two inward flanges extending into the channels for electrically and mechanically engaging with the corresponding rear extensions of the inner shielding member to retain the inner and outer shielding members on the casing and to form electrical connection therebetween. The outer shielding member has grounding tabs connected to a circuit board for grounding purposes thereby also grounding the inner shielding member.


REFERENCES:
patent: 4689723 (1987-08-01), Myers et al.
patent: 4913664 (1990-04-01), Dixon et al.
patent: 5007862 (1991-04-01), Defibaugh et al.

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