Electrical connectors – With supporting means for coupling part – Having resilient means engaging panel opening
Reexamination Certificate
2000-04-24
2003-12-02
Bradley, P. Austin (Department: 2833)
Electrical connectors
With supporting means for coupling part
Having resilient means engaging panel opening
C439S876000, C439S943000
Reexamination Certificate
active
06655990
ABSTRACT:
BACKGROUND OF THE INVENTION
b
1
. Field of the Invention
The present invention relates to a method of surface mounting a connector on a printed circuit board, and a connector, and more particularly, to a method of surface mounting a connector by fixing the connector to a printed circuit board prior to reflow soldering, and a connector.
2. Description of the Related Art
In recent years, a system adapted to data communications comes to be placed in an environment equipped with a STM (Synchronous Transfer Mode) node, a remote access user receiving module, a fast IN (Intelligent Networks) service control node, and an ATM (Asynchronous Transfer Mode) node. A printed circuit board for each node, particularly one for the remote access user receiving module, has main component parts thereof mounted by the SMT (Surface Mount Technology) due to the necessity for mass production thereof. Of the main component parts, terminals of connectors for connecting the module are also surface mounted.
Conventionally, the surface mount is carried out by the following procedure: Soldering paste is printed on a printed circuit board. Each component chip is mounted on the printed circuit board printed with the soldering paste. The resulting printed circuit board is placed in a reflow furnace whereby the soldering paste is melted to solder the component chips.
FIGS.
22
(A) and
22
(B) show an example of the construction of a conventional connector for surface mount. FIG.
22
(A) is a plan view of the connector, while FIG.
22
(B) is a cross-sectional view take on line X
0
-X
0
of FIG.
22
(A). The connector
90
has a body
91
, and a plurality of long lead pins
91
a
and a plurality of short lead pins
91
b
extending from the body
91
. These lead pins
91
a,
91
b
are placed on a pattern of a printed circuit board. Within the body
91
, there are provided female terminals
91
c,
91
d
each electrically connected to a corresponding one of the lead pins
91
a,
91
b.
The female terminals
91
c,
91
d
have male terminals inserted therein from a casing via respective through holes
91
e,
91
f
of the body
91
.
Further, the body
91
of the connector
90
has arms
92
,
93
formed on opposite sides thereof for protection of the lead pins
91
a,
91
b.
These arms
92
,
93
are formed with rivet holes
92
a,
93
a.
The connector
90
constructed as above is first positioned on the printed circuit board such that the lead pins
91
a,
91
b
are located on respective pads of the pattern. In this state, rivets are inserted through the rivet holes
92
a,
93
a,
respectively, and the connector
90
is fixed to the printed circuit board by these rivets. After having the other chips mounted or placed thereon, the printed circuit board is placed in a reflow furnace to carry out the reflow process for soldering the chips to the printed circuit board.
Since the connector
90
is fixed to the printed circuit board by the rivets, there is no fear of displacement thereof before the soldering. The lead pins
91
a,
91
b
receive downward urging forces so that they are positively brought into intimate contact with the pads. Further, after the printed circuit board is completed, male connectors are frequently inserted and removed from the connector
90
for inspection of quality thereof. However, breaking stress can be prevented from being applied to the soldered portions during the frequent inspections.
To meet the above-mentioned ends, various connectors other than the one having the construction illustrated in FIGS.
22
(A) and
22
(B) are manufactured. For instance, Japanese Laid-Open Patent Publication (Kokai) No. 5-347174 discloses a connector formed with arms having respective hook members on opposite sides thereof, the arms being fitted in respective cutouts formed in a printed circuit board to have the connector fixed to the printed circuit board. Japanese Laid-Open Patent Publication (Kokai) No. 7-211409 discloses a connector formed with a hook-shaped locking member and a hooking portion, for use with a printed circuit board formed with a locking hole and a cutout portion. The locking member and the hooking portion of the connector are fitted in the locking hole and the cutout portion of the printed circuit board, respectively, whereby the connector is fixed to the printed circuit board.
In the case of the connector shown in FIGS.
22
(A) and
22
(B), application of a force of approximately 200 grams is required to insert the rivets into the rivet holes
92
a,
93
a,
respectively. However, an ordinary automatic component-mounting system is capable of exerting a small force of several tens grams for urging each chip to the printed circuit board. Therefore, conventionally, the rivets are required to be inserted into the respective rivet holes by manual operations, which leads to a degraded productivity. Although it is also possible to provide a dedicated apparatus for the riveting, this leads to a large increase in the manufacturing cost and hence is not practical.
On the other hand, the connectors disclosed in Japanese Laid-Open Patent Publication (Kokai) Nos. 5-347174 and 7-211409 cannot have their above-mentioned fixing members properly fitted merely by placing the connectors on the respective printed circuit boards, and hence after all, manual operations are required in the surface mounting.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method of surface mounting a connector, which enables the connector to be automatically mounted while preserving reliability of soldered portions without additionally providing a special apparatus, as well as a connector.
To attain the above object, the present invention provides a method of surface mounting a connector on a printed circuit board. The method of surface mounting the connector on the printed circuit board comprises the steps of inserting a hook member formed on the connector, for fixing the connector, into a through hole formed through the printed circuit board, for insertion of the hook member, and bringing the connector into intimate contact with the printed circuit board by deforming the hook member by heat generated for reflow soldering.
The above and other objects, features and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate preferred embodiments of the present invention by way of example.
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patent: 60-087182 (1985-06-01), None
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Aoki Fumio
Ota Kazuhiko
Terauchi Hideaki
Teshima Yasuhiro
Bradley P. Austin
Fujitsu Limited
Katten Muchin Zavis & Rosenman
León Edwin A.
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