Electrical connectors – Electromagnetic or electrostatic shield – Multi-part shield body
Reexamination Certificate
2001-05-23
2002-06-25
Bradley, P. Austin (Department: 2833)
Electrical connectors
Electromagnetic or electrostatic shield
Multi-part shield body
C439S418000, C439S944000
Reexamination Certificate
active
06409544
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to electric connectors and, more specifically, to a network data transmission cable connector for connection between a cable and a modem.
Twisted pairs, coaxial cables, and fiber optical cables are commonly used as data transmission media for data transmission between transmitter means and receiver means.
A twisted pair includes two electrically insulated conductors arranged together in a spiral form. It can be used as a communication chain. As illustrated in
FIG. 1
, a network transmission cable
50
is comprised of a cable
51
, and two connectors
52
. The cable
51
is comprised of multiple twisted pairs
53
(for example, four twisted pairs as shown in
FIG. 2
) arranged in parallel, and a protective sleeve
54
covering the twisted pairs
53
. The connectors
52
are respectively connected to the two ends of cable
51
for enabling the cable
51
to be connected between two communication apparatus. It is well known that arranging electrically insulated conductors
59
in twisted pairs
53
greatly reduces electromagnetic interference between the electrically insulated conductors
59
. However, the lead ends and tail ends of the electrically insulated conductors
59
of the twisted pairs
53
must be maintained straight, so that the electrically insulated conductors
59
can be respectively inserted into the respective connectors
52
, and the respective terminals
55
of the connectors
52
can pierce through the insulator of the respective electrically insulated conductors
59
to make a respective electric contact (see FIG.
4
). Because the lead ends and tail ends of the electrically insulated conductors
59
of the twisted pairs
53
are maintained straight in the connectors
52
, electromagnetic interference exists in the connectors
52
.
In order to eliminate the aforesaid electromagnetic interference problem, an improved structure of connector
52
is developed. This improved structure of connector
52
, as shown in
FIG. 2
, comprises a connector plug
60
, and a plastic conductor holder
56
. The connector plug
60
comprises a backwardly extended mounting chamber
61
, a back opening
62
on the back side thereof through which the plastic conductor holder
56
is inserted into the mounting chamber
61
, a plurality of horizontal conductor slots
64
respectively forwardly extended from the mounting chamber
61
and adapted to receive the electrically insulated conductors
59
of the twisted pairs
53
of the cable
51
, a plurality of vertical terminal slots
63
respectively disposed at the front side thereof in communication with the conductor slots
64
, and a plurality of metal terminals
55
respectively mounted in the vertical terminal slots
63
. The plastic conductor holder
56
holds the electrically insulated conductors
59
of the twisted pairs
53
of the cable
51
in the mounting chamber
61
of the connector plug
60
, comprising a back opening
57
, which receive the twisted pairs
53
of the cable
51
, and parallel conductor slots
58
, which receive the electrically insulated conductors
59
of the twisted pairs
53
of the cable
51
respectively, for enabling the electrically insulated conductors
59
of the twisted pairs
53
of the cable
51
to be respectively inserted into the conductor slots
64
of the connector plug
60
upon insertion of the plastic conductor holder
56
with the twisted pairs
53
of the cable
51
into the mounting chamber
61
of the connector plug
60
, so that the metal terminals
55
can pierce through the insulator of each electrically insulated conductor
59
of the twisted pairs
53
of the cable
51
to make a respective electric contact (see FIG.
3
). Because the lead (or tail) ends of the electrically insulated conductors
59
of the twisted pairs
53
of the cable
51
are kept straight for contact with the metal terminals
55
respectively, electromagnetic interference exists in the straight lead (or tail) ends of the electrically insulated conductors
59
of the twisted pairs
53
of the cable
51
. Furthermore, because the conductor holder
56
is molded from plastics, it cannot protect the electrically insulated conductors
59
of the twisted pairs
53
of the cable
51
against electromagnetic interference.
SUMMARY OF THE INVENTION
The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a network data transmission cable connector, which minimizes electromagnetic interference between the conductors of the twisted pairs of the cable.
According to one aspect of the present invention, the network data transmission cable connector is adapted to receive the electrically insulated conductors of the twisted pairs of a cable having a protective outer sleeve and 4 twisted pairs in the protective outer sleeve. The network data transmission cable connector comprises a connector plug, a plastic conductor holder block and a metal shield respectively mounted in the connector plug and adapted to guide the electrically insulated conductors of the twisted pairs of a cable into contact with respective metal terminals in the connector plug, the metal shield having a corrugated configuration adapted to separate the twisted pairs of the cable, for enabling the first, second and third twisted pairs of the cable to be separately supported above the metal shield and the two electrically insulated conductors of the fourth twisted pair of the cable to be separately supported below the metal shield.
According to another aspect of the present invention, the conductor holder block comprises eight conductor holes alternatively arranged into two horizontal rows at different elevations for guiding the electrically insulated conductors of the twisted pairs of the cable separately into contact with the respective metal terminals of the connector plug.
REFERENCES:
patent: 4824383 (1989-04-01), Lemke
patent: 5057038 (1991-10-01), Bowen et al.
patent: 5063314 (1991-11-01), DeSantis
patent: 5586911 (1996-12-01), Miller et al.
patent: 5727962 (1998-03-01), Caveney et al.
patent: 5766043 (1998-06-01), Talend
patent: 5830015 (1998-11-01), Rodrigues et al.
patent: 5842887 (1998-12-01), Andrews
patent: 5899770 (1999-05-01), Ezawa
patent: 6077122 (2000-06-01), Elkhatib et al.
patent: 6080007 (2000-06-01), Dupuis et al.
patent: 6099345 (2000-08-01), Milner et al.
patent: 6280232 (2001-08-01), Beecher et al.
Bradley P. Austin
Jones Tullar & Cooper P.C.
León Edwin A.
Lorom Industrial Co., Ltd.
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