Electrical connectors – Electromagnetic or electrostatic shield – Multi-part shield body
Reexamination Certificate
1999-03-04
2001-04-03
Nguyen, Khiem (Department: 2839)
Electrical connectors
Electromagnetic or electrostatic shield
Multi-part shield body
Reexamination Certificate
active
06210227
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a connector and particularly relates to a connector comprising a plurality of signal terminals for transmitting electric signals and a plurality of ground terminals disposed so as to surround the signal terminals and both the signal and ground terminals are arranged in a zigzag manner, and to a method of shielding the signal terminals.
The present application is based on Patent Application No. Hei 10-060045 filed in Japan, the contents of which are incorporated herein by reference.
2. Background Art
Conventionally, connectors for mutually connecting bases for transferring high frequency signals or for mutually connecting bases and cables are constructed with a plurality of signal terminals and the ground terminals. In general, those ground terminals are normally disposed around the signal terminals to form a pseudo coaxial structure. Such a structure is advantageous in improving the transmission properties of the high frequency signal and in suppressing crosstalk.
FIG. 9
shows a perspective view of a terminal
20
used for the above mentioned connector, and it is general to commonly use this terminal
20
for the signal terminals as well as for ground terminals.
However, in a connector having such a simple terminal, such as the terminal shown in
FIG. 9
, if the signal frequency passing the connector becomes high, the amount of electromagnetic radiation emitted from the signal terminals increases, which results in causing crosstalk in adjacent signal terminals.
In contrast, the connector, proposed in the Japanese Patent Application, First Publication No. Hei 7-211404 is provided with a ground terminal with a modified shape, which shields electromagnetic waves emitted from each signal terminal, in order to suppress generation of crosstalk. In this case, however, the shape of the ground terminals is modified so as to be able to shield the electromagnetic waves emitted from the signal terminals for eliminating the generation of crosstalk. However, in this ground terminal, only the shape for connecting it with the base is modified, and the structure inside the connector (inside the housing) remains simple. Thus, since the electromagnetic radiation still passes through a tulip like open portion, sufficient shielding of radiation and sufficient removal of crosstalk is not realized by that connector. It is also difficult from the manufacturing point of view to form the portion bent at an right angle to the base connecting side so as to be able to effectively shield the radiation.
It is therefore the object of the present invention to provide a connector with a simple structure and also provide a method for shielding the signal terminals so as to shield the electromagnetic radiation even in inside of the connector to ensure prevention of problems such as crosstalk.
SUMMARY OF THE INVENTION
According to the first aspect of the present invention, the present invention provides a connector comprising a plurality of signal terminals for transmitting electric signals and a plurality of ground terminals for grounding disposed so as to surround the signal terminals and both signal terminals and ground terminals being arranged in a zigzag manner, wherein said ground terminals are provided with a plate-like sealed beam projecting in the direction of the front end of the connected portion; a sub-beam formed bent at right angle from the base position of said sealed beam towards its point and extending in parallel with said sealed beam without interfering with said sealed beam; and a main beam extending in parallel with said sealed beam and bent at an right angle in the same direction as the sub-beam, such that the shape of the connector is F-shaped, when viewed from the direction of connecting portion.
According to the present aspect of the invention, the plate-like sealed beam shields the electromagnetic radiation such that it is possible to prevent crosstalk . The formation of the sealed beam makes it possible to sufficiently shield the inside of the connector.
According to the second aspect of the present invention, the connector according to the first aspect has a sealed beam which is L-shaped.
This connector provides a shield effect between the signal terminals by a plate or a L-shaped sealed beam, so that problems such as crosstalk can be eliminated.
In addition, the L-shaped sealed beam means that the sealed beam is provided with a flange extending vertically from one end of the plate-like sealed beam, so that it is possible to shield the electromagnetic radiation from the perpendicular and the lateral directions by means of the plate section and the flange section which is vertical to the plate section.
According to the third aspect of the present invention, the connector according to the first aspect can be more surely shielded when adopting a constitution such that the circumference of the signal terminals are surrounded by the ground terminals and the ground pins of the part to be connected to (called hereinafter “counterpart connector”).
According to the fourth aspect, it is more preferable to adopt a structure in which the ground terminals and the ground pins of the counterpart connector cross at a right angle.
According to the fifth aspect of the present invention, the present invention provide a connector comprising a plurality of signal terminals for transmitting electric signals and a plurality of ground terminals disposed so as to surround the signal terminals, and both signal terminals and ground terminals being arranged in a zigzag manner, wherein, when connecting, the radiation from the signal terminals is shielded by using a design such that the circumference of the signal terminals are surrounded by the ground terminals and the ground pins of the counterpart connector.
According to this shielding method, the connector is designed so as to shield the signal terminals only at the time of connection, and it is not necessary to shield the radiation before the connection so that the connector may have an improved structure with a higher degree of structural freedom.
In addition, in this aspect of the invention, it is more preferable to adopt a structure in which the ground terminals and the ground pins of the counterpart connector cross at a right angle, as described in the sixth aspect of the present invention.
REFERENCES:
patent: 5460533 (1995-10-01), Broeksteeg
patent: 5660551 (1997-08-01), Sakurai
Kuroi Yoshihiro
Yamasaki Shuji
NEC Corporation
Nguyen Khiem
Young & Thompson
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