Electrical connectors – Electromagnetic or electrostatic shield – Multi-part shield body
Reexamination Certificate
2000-06-13
2001-12-11
Abrams, Neil (Department: 2839)
Electrical connectors
Electromagnetic or electrostatic shield
Multi-part shield body
Reexamination Certificate
active
06328602
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a connector having signal sockets and ground sockets, and a method of manufacturing the same. More particularly, the present invention relates to a connector capable of reducing crosstalk between signal sockets, and a method of manufacturing the same.
2. Description of the Related Art
Along with the recent trend of higher performance and smaller size of electronic appliances, small-sized connectors for high density mounting are proposed.
FIG. 1
is a perspective view showing an example of a conventional connector,
FIG. 2
is a side sectional view, and
FIG. 3
is a sectional view along line A—A in FIG.
2
.
As shown in
FIG. 1
to
FIG. 3
, a conventional connector is composed of signal sockets
10
and ground sockets
20
to change a direction of wiring lines from a printed circuit board (not shown) by 90 degrees. The signal socket
10
and the ground socket
20
are made of copper-alloy. In order to reduce crosstalk as much as possible when electromagnetic wave is radiated from the signal socket
10
, the signal sockets
10
and the ground sockets
20
are alternately arranged in a matrix of a housing
30
made of a synthetic resin. That is, the ground sockets
20
are disposed around the signal socket
10
to surround the signal socket
10
. Thus, the ratio of the signal sockets
10
and ground sockets
20
in the housing
30
is 1:1.
The signal sockets
10
and ground sockets
20
are identical in shape and used commonly. The socket is composed of a contact lead section
11
,
21
, a tail section
13
,
23
and a lead terminal section
12
,
22
. The contact lead section
11
,
21
extends in a horizontal direction and is connected with a male terminal (not shown) as a terminal to be connected. The lead terminal section
12
,
22
extends in a downward direction and is inserted into a through-hole (not shown) in the printed circuit board. The tail section
13
,
23
is provided between the contact lead section
11
,
21
and the lead terminal section
12
,
22
to be inclined in an oblique and downward direction. The tail section
13
,
23
converts the connection direction from the direction of the contact lead section
11
,
21
to the direction of the lead terminal
12
,
22
by 90 degrees. The tail sections
13
,
23
are longer at higher side, and shorter at lower side. The contact lead section
11
,
21
is composed of a pair of opposing contact leads
11
a
and
21
a.
Each of the contact leads
11
a
and
21
a
is bent to have lead end portions
11
b
and
21
b
as a V-shaped portions so that the lead end portions opposes to each other. Thus, the male terminal can be held between the lead end portions
11
b
and
21
b
by their spring or elastic force. In such signal sockets
10
and ground sockets
20
, the contact lead sections
11
and
21
are held in a state embedded in a housing main body
31
. Also, the tail sections
13
and
23
are covered by a housing cover
32
, and the lead terminal sections
12
and
22
project from the lower side of the housing cover
32
.
A high speed transmission connector is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 7-122335). In this reference, the periphery of signal socket is surrounded by an L-shaped contact of a ground socket. Thus, since the signal contact is electromagnetically shielded by the ground contact, generation of crosstalk noise is suppressed, and deviation of propagation delay are decreased.
In a transmission circuit for transferring an electric signal, including a connector, the crosstalk often causes problems. The effect of crosstalk is more serious when the frequency (rising time) of the electric signal is higher and the distance between adjacent signal socket
10
is shorter. In recent, owing to the increase of switching speed of a switching system, the frequency (rise time) of the electric signal is much higher, and by the reduction of size of electronic appliances, the distance between the signal sockets
10
is much shorter.
Therefore, in the conventional connector, the electromagnetic wave radiated from a signal socket
10
in an oblique direction cannot be shielded, and the crosstalk cannot be reduced sufficiently. In order to shield the electromagnetic wave in the oblique direction of the signal socket
10
, it could be considered that the ground sockets
20
are disposed around the signal socket
10
, i.e., in the vertical, lateral and oblique directions of the signal socket
10
. In this case, however, the composition ratio of signal sockets
10
and ground sockets
20
becomes 1:4, and the number of signal sockets
10
is smaller so that high density can not be attained.
In conjunction with the above description, a connector is disclosed in Japanese Laid Open Patent Application (JP-A-Heisei 8-195250). In the connector (
9
) of the reference, insulator (
3
) is put between a ground line (
2
) and a signal line (
1
) such that the ground line (
2
) and the signal line (
1
) oppose to each other. The signal line (
1
) has an impedance to the ground. The impedance value is set to be equal to the impedance of a printed circuit board. In this way, the impedance matching is established and moreover cross talk noise is prevented.
Also, a connector is disclosed in Japanese Patent No. 2,811,541. This reference relates to the connector having a quasi-coaxial type structure in which a peripheral portion of a signal contact is surrounded by a ground contact. Each of the signal contact and the ground contact has one end which is connected with a printed circuit board, the other end which is held by a connector housing and is connected with a counter connector, and a direction conversion section bent between the ends from a direction of connection to the printed circuit board to a direction of insertion and drawing-out of the counter connector. A cylindrical insulator is provided for the direction conversion section of the signal contact to isolate between the direction conversion section of the signal contact and the direction conversion section of the ground contact.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a connector which has a small size and crosstalk can be reduced.
Another object of the present invention is to provide a connector which can shield electromagnetic wave between adjacent signal sockets.
Still another of the present invention is to provide a method of manufacturing the above connectors.
In order to achieve an aspect of the present invention, a connector includes signal sockets, and ground sockets. The signal sockets and the ground sockets are made of electrically conductive material and alternately arranged in a column direction and a row direction. Each of the signal sockets includes a contact lead section for an external signal lead to be connected, and a base section connected to the contact lead section of the signal socket. Also, each of the ground sockets includes a contact lead section for an external ground lead to be connected, a first extending section extending between one of the signal sockets which is arranged adjacent to the ground socket and one of two of the signal sockets which are arranged adjacent to the ground socket obliquely from the one signal socket, and a base section connected to the contact lead section of the ground socket and the first extending section. Here, the first extending section of the ground socket shields electromagnetic wave from the one signal socket to the one of the two signal sockets.
Also, the ground socket further includes a second extending section extending between the one signal socket and the other of the two signal sockets, and connected to the base section. In this case, the second extending section of the ground socket shields electromagnetic wave from the one signal socket to the other of the two signal sockets. Moreover, the first and second extending sections are desirably bent In a gull-wing form.
Also, the contact lead section of the ground socket includes a pair of contact leads opp
Kikuchi Kazuya
Yamasaki Shuji
Abrams Neil
Foley & Lardner
Le Thanh-Tam
NEC Corporation
LandOfFree
Connector with less crosstalk does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Connector with less crosstalk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Connector with less crosstalk will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2574366