Electrical connectors – With vitreous-type envelope – Having bayonet-coupling contact
Reexamination Certificate
2001-11-16
2003-09-16
Gilman, Alexander (Department: 2833)
Electrical connectors
With vitreous-type envelope
Having bayonet-coupling contact
C439S947000, C439S521000
Reexamination Certificate
active
06619987
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to balanced transmission connectors, and more particularly, to a balanced transmission connector with a cable which is applied for a part of the balanced transmission of data and connects a computer with a peripheral device.
2. Description of the Related Art
A cable and connector unit, in which connectors are connected with both ends of the cable, is used for connecting a personal computer with a peripheral device. Data are transmitted between the personal computer and the peripheral device, by connecting respective connectors which are at the respective ends of the cable with the personal computer and the peripheral device.
There are two methods as data transmission methods. One is a normal transmission method and the other is a balanced transmission method. In the normal transmission method, one electric wire is used for every datum. Contrary, in the balanced transmission method, a pair of electric wires are used for every datum. A “+” signal to transmit and a “−” signal are simultaneously transmitted in the balanced transmission method. A magnitude of the “−” signal is equal to that of the “+” signal. A direction of the “−” signal is reverse to that of the “+” signal. Use of the balanced transmission method is on the increase for data transmission because the balanced transmission method has an advantage in that it is more robust against a noise than the normal transmission method.
With the recent development of personal computers and networks thereof, systems are required for transmitting a large amount of data of, especially, moving pictures, video images, or the like. In order to transmit a large amount of dynamic image data, it is necessary to transmit data at a high data transmission rate, more than 1 gigabit/sec.
In case of that the data transmission is implemented at high rate such as more than 1 gigabit/sec, a wavelength of the signal is short. Therefore, an electromagnetic wave occurring in an inside of the connector can easily leak to outside of the connector. Thus, it is necessary to take measure as to an electromagnetic interference (EMI) for a balanced transmission connector with a cable.
An applicant of the present patent application filed a Japanese patent application, which was published as a Japanese Laid-Open Patent Application No. 2000-068007, “Balanced-Transmission Cable-And-Connector Unit”. In this patent application, a balanced transmission connector with a wire has a structure in which a plug for a balanced transmission is inserted in a shield cover assembly. The plug for a balanced transmission has a structure in which the pair of the first and the second signal contacts and the ground contact having a board shape are arranged in turn at predetermined intervals in a block made of synthetic resin.
FIGS. 1A and 1B
are views showing a conventional shield cover assembly. Referring to
FIG. 1A
, a shield cover assembly
140
includes a first half shield cover
141
and a second half shield cover
145
connected together. Flat-surface edges of side wall parts
142
and
143
of the first half shield cover
141
are in contact with flat-surface edges of side wall parts
146
and
147
of the second half shield cover
145
.
Referring to
FIG. 1B
, a shield cover assembly
150
includes a first half shield cover
151
and a second half shield cover
155
connected together. Side wall parts
152
and
153
of the first half shield cover
151
are situated inside side wall parts
156
and
157
of the second half shield cover
155
. The side wall part
152
overlaps the side wall part
156
. The side wall part
153
overlaps the side wall part
157
.
However, in the shield cover assembly
140
shown in
FIG. 1A
, an “electric gap” may be formed partially at positions where the flat-surface edges of the side wall parts
142
and
143
of the first half shield cover
141
are in contact with the flat-surface edges of the side wall parts
146
and
147
of the second half shield cover
145
. The “electric gap” connects straight the inside of the shield cover assembly
140
with the outside thereof. The “electric gap” is defined as a gap having a size through which the electromagnetic wave can pass. Accordingly, the shield cover assembly
140
does not have a sufficient electromagnetic sealability to shield the electromagnetic wave leaking from the inside of the connector to the outside.
On the other hand, the shield cover assembly
150
shown in
FIG. 1B
has a structure in which the side wall part
152
is covered with the side wall part
156
, and the side wall part
153
is covered with the side wall part
157
. Accordingly, an “electric gap” is unlikely to be formed between the first half shield cover
151
and the second half shield cover
155
. Hence, an electromagnetic sealability of the shield cover assembly
150
is better than that of the shield cover assembly
140
shown in FIG.
1
A. However, a width L of the shield cover assembly
150
is increased due to the overlap of the side wall parts
152
,
153
,
156
, and
157
as described above. Hence, the shield cover assembly
150
has a disadvantage in that a size of the balanced transmission connector is big.
SUMMARY OF THE INVENTION
Accordingly, it is a general object of the present invention is to provide a novel and useful balanced transmission connector in which one or more of the problems described above are eliminated.
Another and more specific object of the present invention is to provide a small-size balanced transmission connector having a sufficient electromagnetic sealability to limit an electromagnetic wave leaking from an inside of a balanced transmission connector to an outside of the connector.
The above objects of the present invention are achieved by a balanced transmission connector, including a relay board, a plug body for balanced transmission provided on an end part of the relay board, a cable for balanced transmission connected with another end part of the relay board, and a shield cover assembly covering the relay board, the plug body for balanced transmission, and a part of the cable and including a first half shield cover having side wall parts, an edge of which has a step-shaped surface including a base flat surface and a raised flat surface extending in parallel and in a longitudinal direction of the edge, the base flat surface positioned on an interior side of the side walls, and a second half shield cover having side wall parts, an edge of which has a step-shaped surface including a base flat surface and a raised flat surface extending in parallel and in a longitudinal direction of the edge, the base flat surface of the side walls of the second half shield cover positioned on an exterior side of the side walls, wherein the raised flat surface of either one of the first and second half shield covers is in direct contact with the base flat surface of another one of the first and second half shield covers in an engaged position in which the first half shield cover and the second half shield cover are connected together. Alternatively, a shield cover assembly may include a first half shield cover which includes a side wall part having an edge, a second half shield cover which includes a side wall part having an edge which faces to the edge of the side wall part of the first half shield cover, a concave part which is formed on the edge of the side wall part of either first or second half shield cover and extends in an longitudinal direction of the side wall part, and a convex part which is formed on the edge of the side wall part of another half shield cover, clamps the concave part and extends in an longitudinal direction of the side wall part, thereby the first half shield cover and the second half shield cover can be connected together.
According to the above invention, it is possible to insure that there is no “electric gap”between the first and second half shield covers, by contacting the end edges of the side wall parts of the respective half shie
Akama Junichi
Kumamoto Tadashi
Miyazawa Hideo
Sata Yoshinori
Shimizu Manabu
Fujitsu Component Limited
Gilman Alexander
Staas & Halsey , LLP
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