Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Reexamination Certificate
2003-05-21
2004-12-28
Ta, Tho D. (Department: 2833)
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
C439S941000
Reexamination Certificate
active
06835101
ABSTRACT:
The present application in based on Japanese Patent Application number 2002-146233, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a modular jack and a modular jack connector which are suitable for use in twisted pair wiring system, and more specifically to a modular jack and a modular jack connector which suppress coupling in and out of a modular jack.
2. Prior Art
In a wiring system for information communication such as LAN (Local Area Network) or telephone, a modular jack which is used for branch and extension of a wiring is defined in U.S.A. Wiring System Standard TIA/EIA568 or Japanese Industrial Standards JISx5150.
In an office of recent years, installation of LAN has been being carried out actively, and TP (twisted pair wire) which is comparatively easy for laying and changing has been being used in many wiring systems in office. A wiring system using this TP and combining data system and telephone system is shown in FIG.
1
.
In this wiring system, plurality of IDFs (Intermediate Distribution Panel)
62
which are concentrically wired to MDF (Main Distribution Frame)
61
are installed, for example, on every floor of building, one or more consent box
63
or boxes
63
which is or are wired to IDF
62
is or are provided to various place of floor, if necessary next step consent box
64
is connected to consent box
63
, and terminal
65
is connected to each consent box
63
,
64
.
A modular connector type patch panel which concentrically wires TP is shown in
FIG. 2
, and consent box is shown in FIG.
3
. As shown in these figures, plurality of modular connectors or modular jack connectors
71
,
81
are arranged side-by-side to patch panel or consent box.
Modular jack is shown in FIG.
4
. Modular jack
91
comprises housing
93
provided with opening
92
to which modular cable (not shown in the figure) is inserted, and eight conductor pins
94
which are incorporated within housing. Provided, this modular jack shown in the figure is according to an embodiment of the present invention, conventional modular jack is different from the figure in arrangement of conductor pins.
Modular jack connector is shown in FIG.
5
. Modular jack connector
101
is constituted by mounting modular jack
91
on substrate
102
and mounting crimping terminal array
103
which is so-called
110
type on substrate
102
. This modular jack connector
101
is according to an embodiment of the present invention, modular jack connector which combined modular jack and crimping terminal array has not been realized heretofore.
As shown in
FIG. 6
, crimping terminal
111
comprises blade portion
112
to which TP is inserted and lead portion
113
which is soldered to substrate
102
.
Inner structure of conventional modular jack is shown in FIG.
7
(
a
) and FIG.
7
(
b
). As shown in FIG.
7
(
a
), this modular jack
121
is provided with approximately cubic shaped hollow housing
122
of which left side end in the figure is opened, and inside of the housing
122
, eight conductor pins
125
having convex bending portion
124
toward opening portion
123
(referred to as “forward”) are arranged at even intervals to right and left direction. Lower part of each conductor pin
125
corresponds to conductor pin leg
126
which passes through bottom of housing
122
, and as shown in FIG.
7
(
b
) numbers one to eight (1-8) are given to each conductor pin
125
in a manner of arranged order from right end as viewed opening portion
123
from outside. Each set of No.
1
and No.
2
conductor pins
125
, No.
3
and No.
6
conductor pins
125
, No.
4
and No.
5
conductor pins
125
, and No.
7
and No.
8
conductor pins
125
is used as conductor pair. Conductor pair means a set of conductors connected to same twisted pair wires.
As shown in the figures, in conventional modular jack, all bending portions
124
of eight conductor pins
125
are lined up at same position toward forward, and eight conductor pin legs
126
are arranged in two lines, wherein No.
1
,
3
,
5
, and
7
conductor pin legs
126
are in a forward line, and No.
2
,
4
,
6
and
8
conductor pin legs
126
are in a backward line.
In conventional U.S.A. Wiring System Standard, only category Se which defines near end cross talk attenuation between twist pairs to be more than 43 dB at 100 MHz is provided. However, category
6
which defines up to frequency band of 250 MHz is engaged to be enacted in U.S.A. Wiring System Standard in 2002. In category
6
, connector is required to have near end cross talk attenuation of more than 54 dB which exceeds category
5
e
11 dB at 100 MHz and more than 46 dB at 250 MHz, it becomes necessary to cancel coupling (electromagnetic coupling) within modular jack and coupling caused by components (substrate, crimping terminal and etc.) other than modular jack. Coupling within modular jack is notably caused by arrangement of No.
3
and No.
6
conductor pins which are sandwiching No.
4
and No.
5
conductor pins, and moreover No.
3
and No.
6
conductor pair space being larger than other conductor pair space, this coupling originates deterioration of cross talk characteristics. Accordingly, improvement to reduce this coupling is desired.
As explained above, in order to fit for category
6
which defines near end cross talk attenuation to be more than 54 dB at 100 MHz and more than 46 dB at 250 MHz, it is necessary to suppress coupling in and out of modular jack. Also, the applicant is going to provide a component (modular jack connector) which combined and unified modular jack with twisted pair wire fitting terminal, it is necessary co suppress coupling in whole modular jack connector.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a modular jack and a modular jack connector which suppresses coupling in and out of a modular jack.
In accordance with this invention, there is provided a modular jack, comprising, a hollow housing of which one end is opened, and eight conductor pins which are arranged with predetermined intervals to right and left directions inside said housing, wherein, each of said conductor pins has bending portion projecting toward said opening portion (this direction is defined by “forward”), lower part of said each conductor pin corresponds to a conductor pin leg which passes through bottom of said housing, when numbers from No.
1
to No.
8
are given respectively to said each conductor pin starting from right, each set of conductor pins of No.
1
and No.
2
, No.
3
and No.
6
, No.
4
and No.
5
, and No.
7
and No.
8
is used respectively as conductor pair, bending portions of said No.
3
and No.
6
conductor pins are positioned more forward than bending portions of other conductor pins, and conductor pin legs of said No.
3
and No.
6
conductor pins are positioned more forward than conductor pin legs of other conductor pins.
In accordance with this invention, there is provided a modular jack, wherein, eight conductor pin legs are arranged in three lines comprising line of No.
3
and No.
6
conductor pin legs, line of No.
2
, No.
5
and No.
7
conductor pin legs, and line of No.
1
, No.
4
and No.
8
conductor pin legs starting from forward.
In accordance with this invention, there is provided a modular jack, wherein, No.
1
and No.
8
conductor pin legs are arranged symmetrically and No.
2
and No.
7
conductor pin legs are arranged symmetrically.
In accordance with this invention, there is provided a modular jack, wherein, lining up direction of No.
1
and No.
2
conductor pin legs and lining up direction of No.
7
and No.
8
conductor pin legs are showing “
” shape by narrowing in forward and widening in backward.
In accordance with this invention, there is provided a modular jack connector, comprising, a modular jack mounted on a substrate using conductor pin legs, and crimping terminal array mounted on said substrate and provided with eight crimping terminals which are electrically connected to each con
Fujiwara Shinjiro
Hirokawa Kenichi
Ishikawa Hiroshi
Hitachi Cable Ltd.
Leon Edwin A.
McGinn & Gibb PLLC
Ta Tho D.
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