Electrical connectors – With circuit conductors and safety grounding provision – Grounding to connector container or housing
Reexamination Certificate
2000-01-19
2001-12-11
Nguyen, Khiem (Department: 2839)
Electrical connectors
With circuit conductors and safety grounding provision
Grounding to connector container or housing
C439S607070, C439S939000
Reexamination Certificate
active
06328579
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to an electromagnetic shield connection mechanism that brings a shielding portion of a connector into tight electric contact with an equipment side.
(2) Description of the Related Art
In
FIGS. 11 and 12
, there is shown a conventional electromagnetic shield connection mechanism disclosed in Japanese Patent Application Laid-Open H8-64306. In the mechanism, a cylindrical metal shield (not shown) is inserted into a connector housing
91
made of synthetic resin and a contact piece
93
of the metal shield is exposed from a housing wall
92
at the bottom of the housing
91
, thereby allowing the contact piece
93
to contact with an electric equipment
94
(i.e. mating side).
Inside the connector housing
91
, there is formed a cylindrical part (not shown) which receives a female terminal (not shown) therein. A terminal base
95
protrudes from the housing wall
92
toward the equipment side for being connected with an electric circuit of the equipment side. On the housing wall
92
, there are formed a ring-shaped groove
97
fitting an waterproof packing
96
therein and the contact piece
93
of the metal shield located inside the groove
97
.
The housing wall
92
of the connector housing
91
is fixed to the equipment
94
by bolts
98
, and simultaneously, the contact piece
93
is brought into contact with a connecting face (grounded) of a wall of the equipment
94
. The packing
96
is pressed into the groove
97
of the housing wall
92
and a groove
99
of the equipment
94
, thereby waterproofing the contact piece
93
and the terminal base
95
. The metal shield prevents noises from coming into the terminal
95
. Thus, a direct-mount type connector
100
is composed of the connector housing
91
, the metal shield, the terminal and the waterproof packing
96
.
However, regarding the above conventional mechanism for electromagnetic shield connection, since the housing wall
92
is made of synthetic resin, the housing wall
92
is bent or deformed due to a repulsion force of the packing
96
, and so on, when a significant amount of heat is applied to the housing wall
92
for a long period of time, causing a problem that contact between the contact piece
93
of the metal shield and the contacting face of the wall of the equipment
94
becomes inferior. Even if a spring characteristic is given to the contact piece
93
in order to absorb the deformation of the housing wall, no sufficient contact force is available because of the nature of the material (for example, aluminum alloy) used as the contacting face of the wall of the equipment
94
, such as a central processing unit case, i.e. a unit case of an equipment.
In
FIG. 13
, there is also shown a conventional electromagnetic shield connection mechanism disclosed in Japanese Patent Application Laid-Open H8-64306. In the mechanism, a terminal
102
having wires is received into a cylindrical housing
101
having a flange made of synthetic resin, a cylindrical metal shield
103
is formed into one united body with the housing
101
therein, and a flange of the metal shield
103
is fixed to a wall of an equipment
105
together with a flange
104
of the housing
101
using bolts
106
, thereby making a contact between the metal shield
103
and the equipment
105
.
A core
113
of a shielded wire
107
is crimp-connected to one side of the terminal
102
, and a terminal
109
of a wire
108
of the equipment side is rigidly connected to another side of the terminal
102
using a bolt
110
. A braided shield
111
of the shielded wire
107
is connected to the metal shield
103
via a holder
112
.
However, regarding the above conventional mechanism for electromagnetic shield connection, since the housing
101
made of synthetic resin lies between the metal shield
103
and the terminal
102
, a tightening force by the bolts
106
is deteriorated as the housing
101
and the flange
104
become thin when heat, vibration and impact are applied continuously, causing a problem that a contact between the metal shield
103
and the equipment
105
becomes inferior.
It is therefore an object of the present invention to solve the above-mentioned problems that the contact between the metal shield and the equipment side becomes inferior due to the deformation of the housing wall and/or an oxidation of the connection face of the equipment side, and to provide an electromagnetic shield connection mechanism enabling the secure electromagnetic shielding to be always achieved by improving the contact between the metal shield and the equipment side.
SUMMARY OF THE INVENTION
An electromagnetic shield connection mechanism according to the present invention is for a structure in which a housing wall is fixed to an equipment by inserting bolts through a collar fitted in holes formed on the housing wall.
In order to accomplish the above object, a first aspect of the present invention is to provide an electromagnetic shield connection mechanism characterized in such a manner that a contact member lies between the collar and the equipment so that the collar presses the contact member against the equipment.
A second aspect of the present invention is to provide the electromagnetic shield connection mechanism, wherein an electrically conductive layer on a surface of the housing is kept in contact with the contact member.
A third aspect of the present invention is to provide the electromagnetic shield connection mechanism, wherein the contact member has a pair of plates faced with each other, the one plate having a collar-receiving hole, the other plate having a bolt-receiving hole, and the each plate is kept in contact with the each corresponding surface of the housing wall.
A fourth aspect of the present invention is to provide the electromagnetic shield connection mechanism, wherein the contact member is mounted at three spots of the housing wall.
A fifth aspect of the present invention is to provide the electromagnetic shield connection mechanism, wherein the contact member having a bolt-receiving hole is unitedly shaped together with a metal shield.
A sixth aspect of the present invention is to provide the electromagnetic shield connection mechanism, wherein the metal shield is connected to a shielding portion of a shielded wire.
A seventh aspect of the present invention is to provide the electromagnetic shield connection mechanism, wherein the collar is composed of a flange part and a cylindrical part.
A eighth aspect of the present invention is to provide the electromagnetic shield connection mechanism, wherein a hollow for a scrap to be collected therein is provided at a press-fitting end of the collar.
According to the main aspect of the present invention, the collar presses the contact member connected to a metal shield tightly against the equipment by fastening a bolt, resulting in that a secure electromagnetic shielding is always achieved by the improved contact between the metal shield and the equipment. Even if the housing wall of the connector and the equipment wall are deformed caused by substantial heat, the electromagnetic shield connection quality does not deteriorate since the collar always presses the contact member against the equipment. Further, the contact member is closely fixed with the equipment without leaving an opening therebetween so that a possible oxidation of the equipment surface, such as an aluminum surface, is prevented, resulting in that no deterioration in quality of the electromagnetic shielding take place for a long time.
REFERENCES:
patent: Re. 29752 (1978-09-01), Jaconette
patent: 5108296 (1992-04-01), Takano et al.
patent: 5616052 (1997-04-01), Pan et al.
patent: 6149463 (2000-11-01), Hashizawa et al.
patent: 8-64306 (1996-03-01), None
Hashizawa Shigemi
Masuda Satoki
Mori Shigeo
Armstrong Westerman Hattori McLeland & Naughton LLP
Nguyen Khiem
Yazaki -Corporation
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