Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Reexamination Certificate
2002-12-10
2004-04-06
Paumen, Gary F. (Department: 2833)
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
C439S516000
Reexamination Certificate
active
06716067
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multi-connector used in a high-speed communication apparatus for signal connection of the high-speed communication apparatus, and a method for mounting the multi-connector into a printed board.
2. Description of the Related Art
As a multi-connector in a high-speed communication apparatus, there is used a multi-connector constituted by a pair of male and female connectors in each of which a large number of terminals are arranged in parallel at intervals of a predetermined pitch and fixed in a connector housing.
FIGS. 5A and 5B
are sectional views of male and female connectors in a multi-connector for use in a high-speed communication apparatus, for example, as disclosed in Japanese Patent Laid-Open No. Hei. 62736. In addition,
FIG. 5C
is a bottom view showing main part of the female connector depicted in FIG.
5
B.
In
FIG. 5A
, each male terminal
1
has a signal terminal part
1
c
, and a ground terminal part
1
b
paired with the signal terminal part
1
c
. In
FIG. 5B
, each female terminal
2
has a signal terminal part
2
c
, and a ground terminal part
2
b
paired with the signal terminal part
2
c
. These male terminals are arranged at intervals of a predetermined pitch and fixed in a common connector housing
3
. These female terminals are arranged at intervals of a predetermined pitch and fixed in a common connector housing
4
. Thus, a multi-connector is constituted by the male and female connectors paired with each other. Each male terminal
1
(each female terminal
2
) is divided into two terminal parts extending axially, that is, a signal terminal part
1
c
(
2
c
) and a ground terminal part
1
b
(
2
b
) so that impedance matching between the terminal parts is perfect. The signal terminal part
1
c
(
2
c
) and the ground terminal part
1
b
(
2
b
) are isolated from each other by an electrical insulator
1
a
(
2
a
) having a predetermined dielectric constant and a predetermined thickness to form a predetermined value of impedance between the signal terminal part
1
c
(
2
c
) and the ground signal part
1
b
(
2
b
). For example, an electrical insulator 0.5 mm thick is used to form impedance of 50&OHgr; between the signal terminal part
1
c
(
2
c
) and the ground signal part
1
b
(
2
b
). Further, as shown in
FIG. 5C
which is a bottom view of main part of the female connector depicted in
FIG. 5B
, the electrical insulator
2
a
of the female terminal
2
has a width substantially equal to the distance between the signal terminal part
2
c
and the ground terminal part
2
b.
In a high-speed communication apparatus, a multi-connector constituted by a pair of male and female connectors is used for signal connection to a printed board. For example, as shown in
FIG. 6A
which is a sectional view showing connection between the connector and the printed board, and
FIG. 6B
which is a bottom view of
FIG. 6A
, the female terminal
2
of the multi-connector is connected into the printed board
6
. In
FIGS. 6A and 6B
, the signal terminal part
2
c
and the ground terminal part
2
b
as electric pins are connected into through-holes
6
a
and
6
b
, respectively, in the printed board
6
. A copper plating
7
a
(
7
b
), for example, 1 &mgr;m thick is applied to the inner circumference of each through-hole
6
a
(
6
b
). A land portion
8
a
(
8
b
) connected to the copper plating
7
a
(
7
b
) is provided on the pattern wiring side of the printed board
6
. That is, the copper plating
7
a
(
7
b
) is connected to a copper pattern
9
a
(
9
b
), for example, 12 &mgr;m thick through the copper portion
8
a
(
8
b
).
For the multi-connector used in the high-speed communication apparatus and the method of mounting the multi-connector into the printed board, it is necessary to widen the distance between the signal terminal part and the ground terminal part in accordance with the distance between two corresponding through-holes. For example, in the multi-connector for use in high-speed communication apparatus, the distance d
1
between the signal terminal part
2
c
and the ground terminal part
2
b
is about 0.5 mm but the distance d
2
between the through holes
6
a
and
6
b
is widened to about 2 mm because the land portions
8
a
and
8
b
are provided on the pattern wiring side of the printed board
6
. For this reason, characteristic impedance between the signal terminal part and the ground apparatus has a problem in degradation of electrical characteristics.
SUMMARY OF THE INVENTION
The invention is developed for solving the problem. An object of the invention is to provide a multi-connector for use in a high-speed communication apparatus and a method for mounting the multi-connector into a printed board, in which the distance between each signal terminal part and a corresponding ground terminal part in the multi-connector for use in the high-speed communication apparatus need not be widened in the place for connection into the printed board when the signal terminal part and the ground terminal part in the multi-connector for use in the high-speed communication apparatus are attached into the printed board, so that characteristic impedance between the two terminal parts can be restrained from varying.
According to a first aspect of the invention, there is provided a multi-connector for use in a high-speed communication apparatus, the multi-connector including a male connector and a female connector. In the male connector, a plurality of terminals are arranged in parallel at intervals of a predetermined pitch and fixed in a first connector housing. In the female connector paired with the male connector, a plurality of terminals are arranged in parallel at intervals of a predetermined pitch and fixed in a second connector housing. Each of terminals is divided into two terminal parts extending axially. The two terminal parts are isolated from each other by an electrical insulator having a predetermined dielectric constant and a predetermined thickness. Knife edge-like end portions are formed on both sides of the electrical insulator in each of terminal parts of at least one of the male and female connectors. Accordingly, the distance between the two terminal parts need not be widened in the place for connection into the board to be connected. Hence, the multi-connector for use in the high-speed communication apparatus can be obtained so that characteristic impedance between the two terminal parts can be restrained from varying.
According to a second aspect of the invention, there is provided a method for mounting a multi-connector for use in a high-speed communication apparatus into a printed board. The multi-connector includes a male connector and a female connector. In the male connector, a plurality of terminals are arranged in parallel at intervals of a predetermined pitch and fixed in a first connector housing. In the female connector paired with the male connector, a plurality of terminals are arranged in parallel at intervals of a predetermined pitch and fixed in a connector housing. Each of terminals divided into two terminal parts extending axially and isolated from each other by an electrical insulator having a predetermined dielectric constant and a predetermined thickness. Knife edge-like end portions formed on both sides of the electrical insulator in each of the terminal parts of at least one of the male and female connectors. The printed board includes electrically conducting portions, pattern wiring portions, and land portions. The electrically conducting portions formed by applying an electrically high conductive plating to through-holes formed in the printed board to be connected to the multi-connector. The land portions are provided on a pattern wiring portion side and through which the electrically conducting portions are connected to the pattern wiring portions, respectively. The method includes the steps of inserting the connector having the knife edge-like end portions on the both sides of the electrical insulator into corresponding one of the t
Leydig , Voit & Mayer, Ltd.
Mitsubishi Denki & Kabushiki Kaisha
Paumen Gary F.
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