Electrical connectors – With vitreous-type envelope – Having bayonet-coupling contact
Reexamination Certificate
2000-11-07
2003-01-14
Paumen, Gary (Department: 2833)
Electrical connectors
With vitreous-type envelope
Having bayonet-coupling contact
C439S108000, C439S752000, C439S680000
Reexamination Certificate
active
06506078
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an equipment direct-mounting-type shield electric connector.
The present application is based on Japanese Patent Application No. Hei. 11-316662, which is incorporated herein by reference.
2. Description of the Related Art
There has heretofore been proposed a shield-type electric connector as shown in FIG.
7
.
This shield-type electric connector
80
comprises a first shield connector
82
(see, for example, Unexamined Japanese Patent Publication Nos. Hei. 8-78098 and Hei. 8-64306), mounted directly on an equipment (electrical equipment)
81
, and a second shield connector
83
(see, for example, Unexamined Japanese Patent Publication Nos. Hei. 7-245153 and Hei. 7-282891) connected to the first shield connector
82
.
The first shield connector
82
comprises a first connector housing
84
of a synthetic resin, mounted directly on the equipment
81
, and a first metal terminal
85
inserted in the first connector housing
84
. The first connector housing
84
has a hood portion
86
for receiving a second (mating) connector housing
90
, and a metal terminal receiving chamber
87
for receiving the first metal terminal
85
is formed within the hood portion
86
, and extends therethrough. An engagement hole
86
a
is formed through an outer wall of the hood portion
86
. An outer peripheral surface of the metal terminal receiving chamber
87
is covered with a first shielding shell
88
made of metal. The first shielding shell
88
is connected to an electrically-conductive contact member
89
provided between the first connector housing
84
and a wall surface
81
a
of the equipment
81
.
The second shield connector
83
comprises the second connector housing
90
, made of a synthetic resin, a second metal terminal
91
, inserted in the second connector housing
90
, and a second shielding shell
92
of metal mounted in the second connector housing
90
. A metal terminal receiving chamber
93
is formed within the second connector housing
90
, and a lock projection
94
is formed on and projects from an outer surface of the second connector housing
90
. A conductor
95
a
of a shielded wire (or cable)
95
is electrically connected to the second metal terminal
91
. The second metal terminal
91
is inserted in the second shielding shell
92
, and a braided wire
95
b
of the shielded wire
95
is secured to a rear end of the second shielding shell
92
. The engagement hole
86
a
in the first connector housing
84
and the lock projection
94
on the second connector housing
90
jointly provide a lock mechanism.
When the second shield connector
83
is pushed into the first shield connector
82
, the second connector housing
90
is inserted into the hood portion
86
of the first connector housing
84
. The first metal terminal
85
is electrically connected to the second metal terminal
91
, and the first shielding shell
88
is electrically connected to the second shielding shell
92
. The lock projection
94
on the second connector housing
90
is engaged in the engagement hole
86
a
in the first connector housing
84
. Namely, the first and second shield connectors
82
and
83
are fitted together. As a result, the external shielded wire
95
is electrically connected to the equipment
81
.
However, the second shield connector
83
(including the external shielded wire
95
) and the first shield connector
82
, mounted directly on the equipment, have many component parts, and therefore there has been encountered a drawback that many electrical contact points are provided when the two shield connectors
82
and
83
are connected together. As a result, the electrical resistance has increased, and the shielding effected has been lowered.
There has been encountered another problem that a pressing force, acting between the first and second shield connectors
82
and
83
during the connecting operation, increases because of an inserting force, acting between the first and second metal terminals
85
and
91
, and a frictional resistance force acting between the first and second shielding shells
88
and
92
.
And besides, there has been a possibility that the first and second connector housings
84
and
90
are damaged by the pressing force, acting on these housings during the connecting operation, since the two connector housings
84
and
90
are made of an insulative resin. In addition, the lock projection
94
and the engagement hole
86
a
are formed by resin molding, and therefore there has been encountered a disadvantage that molds (not shown) for forming the connector housings
84
and
90
are complicated in construction.
SUMMARY OF THE INVENTION
With the above problems in view, it is an object of the present invention to provide a shield-type electric connector in which the number of component parts is reduced, thereby achieving an enhanced shielding effect, a reduced pressing force during a connecting operation, the prevention of damage to two connector housings during the connecting operation, and a simplified design of molds for resin-molding the two connector housings.
To achieve the above object, according to a first aspect of the present invention, there is provided an equipment direct-mounting-type shield electric connector which includes a pair of first and second shield connectors fittable to each other,
wherein the first shield connector includes:
a first connector housing, mounted directly on a mounting portion of an equipment, and
a first metal terminal which is inserted into a metal terminal receiving chamber in the first connector housing from a connecting side thereof, and is fixed in the chamber; and
wherein the second shield connector includes:
a second connector housing, abutted against the first connector housing,
a second metal terminal, which is inserted into a metal terminal receiving chamber in the second connector housing from that side thereof remote from a connecting side thereof, and is electrically connected to the first metal terminal, and
a rear holder which is inserted into the second connector housing from that side thereof remote from the connecting side thereof so as to prevent rearward withdrawal of the second metal terminal, and covers an outer surface of the second connector housing, and is retained on an outer surface of the first connector housing.
Accordingly, the first and second shield connectors are simpler in construction as compared with the convention construction. The first and second shield connectors are retained and fixed relative to each other by the rear holder which covers the outer surface of the second connector housing, and serves to prevent the rearward withdrawal of the second metal terminal. With this construction, the first and second connector housings are connected together without the use of the related connector's lock mechanism.
According to a second aspect of the present invention, it is preferable that the first metal terminal is inserted into the metal terminal receiving chamber in the first connector housing from that side thereof remote from the connecting side thereof, and a second rear holder for preventing rearward withdrawal of the first metal terminal is mounted on the first connector housing.
In the second aspect of the present invention, the rear holder for preventing the rearward withdrawal of the first metal terminal is mounted on the first connector housing, and therefore the metal terminal, which is to be inserted into the first connector housing from that side remote from the connecting side, can be used.
According to a third aspect of the present invention, it is preferable that the outer surfaces of the rear holder and the first connector housing are covered with a shielding shell made of metal, and one end of the shielding shell is fixedly secured to the mounting portion made of metal, and the other end of the shielding shell is fixedly connected to a braided wire of a shielded wire connected to the second metal terminal.
In the third aspect of the present invention, the shielding s
Ishizaki Kazuhisa
Mori Shigeo
Figueroa Felix O.
Paumen Gary
Sughrue & Mion, PLLC
Yazaki -Corporation
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