Electrical connectors – Preformed panel circuit arrangement – e.g. – pcb – icm – dip,... – With provision to conduct electricity from panel circuit to...
Reexamination Certificate
2002-05-31
2004-11-02
Nguyen, Khiem (Department: 2839)
Electrical connectors
Preformed panel circuit arrangement, e.g., pcb, icm, dip,...
With provision to conduct electricity from panel circuit to...
C439S331000
Reexamination Certificate
active
06811407
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a socket for electrical parts for detachably accommodating and holding an electrical part such as a semiconductor device (called as “IC package” hereinlater), and more particularly, relates to a socket for electrical parts having improved contact pins to be contacted to or separated from terminals of the electrical part.
2. Related Art of the Invention
In a known art, an IC socket of the type mentioned above is preliminarily disposed on a printed circuit board and an IC package is then mounted to and accommodated in this IC socket to thereby establish an electrical connection between the IC package and the printed circuit board.
In such prior art as mentioned above, however, the IC packages includes an LGA (Land Grid Array) type of a structure in which a number of plate-shaped electrodes as terminals are disposed to a lower surface of a rectangular plate-shaped package body.
In this type of the IC package, under the accommodated state of the IC package in the IC socket, when a number of plate-shaped electrodes are contacted to contact portions formed to upper end portions of contact pins of the IC socket, the electrical connection between the respective plate-shaped electrodes of the IC package and the printed circuit board are established through the respective contact pins.
Such prior art structure will be explained hereunder with reference to
FIGS. 12A and 12B
, for example. That is, the contact pin
1
is composed of an upper contact portion
1
a
, a lower contact portion
1
b
and an intermediate elastic portion
1
c
as viewed in
FIG. 12A
or
12
B. The upper contact portion contacts the plate shaped electrode of the IC package
2
when the contact pin
1
contacts the IC package
2
, the lower contact portion
1
b
contacts the printed circuit board
3
, and the elastic portion
1
c
has a circularly curved shape and the upper and lower contact portions
1
a
and
1
b
are connected through this elastic portion
1
c.
The upper and lower contact portions
1
a
and
1
b
are inserted into through holes
4
a
and
4
b
, respectively, formed to a socket body
4
of an IC socket so that the inserted tip end portions are contacted to the IC package
2
and the printed circuit board
3
, respectively, and pressed and then deformed.
However, in the conventional structure such as mentioned above with reference to
FIGS. 12A and 12B
, the contact pin
1
is elastically deformed. That is, the upper contact portion
1
a
abuts against the plate-shaped electrode
2
a
of the IC package
2
and the lower contact portion
1
b
abuts against the printed circuit board
3
, and in this state, these contact portions
1
a
and
2
b
are pressed in directions of arrows in FIG.
12
A. Accordingly, the central arcuate elastic portion
1
c
is deformed and flexed as shown by an arrow in FIG.
12
B. In this operation, the upper and lower contact portions
1
a
and
1
b
, which are perpendicularly aligned, are obliged to be inclined and contacted to (interfere with) peripheral edge portions of the through holes
4
a
and
4
b
of the socket body
4
. In such state, smooth vertical motion of the contact portions
1
a
and
1
b
will not be expected, thus being inconvenient.
SUMMARY OF THE INVENTION
An object of the present invention is to substantially eliminate defects or drawbacks encountered in the prior art mentioned above and to provide a socket for electrical parts capable of preventing the contact pin from interfering with the socket body at the time of deformation thereof to carry out smooth motion of the contact pin.
This and other objects can be achieved according to the present invention by providing, in one aspect, a socket for an electrical part having a socket body to which a number of contact pins are arranged, in which the each of the contact pins has one end portion which electrically contacts a terminal of an electrical part and another one end portion which electrically contacts a printed circuit board,
wherein the contact pin has an elastic portion between the one and another end portions of the contact pin so as to be flexed in one direction and, before mounting of the socket body to the printed circuit board, the one end portion of the contact pin is positioned so as to project outward through one through hole formed to the socket body and bent and inclined in a same direction as the flexed direction with respect to a perpendicular direction.
In another aspect, there is provided a socket for an electrical part having a socket body to which a number of contact pins are arranged, in which the each of the contact pins has one end portion which electrically contacts a terminal of an electrical part and another one end portion which electrically contacts a printed circuit board,
wherein the contact pin has an elastic portion between the one and another end portions of the contact pin so as to be flexed in one direction and, before accommodation of the electrical part in the socket body, the another one end portion of the contact pin is positioned so as to project outward through another one through hole formed to the socket body and bent and inclined in a same direction as the flexed direction with respect to a perpendicular direction.
In a further aspect, there is also provided a socket for an electrical part having a socket body to which a number of contact pins are arranged, in which the each of the contact pins has one end portion which electrically contacts a terminal of an electrical part and another one end portion which electrically contacts a printed circuit board,
wherein the contact pin has an elastic portion between the one and another end portions of the contact pin so as to be flexed in one direction and, the one and another end portions of the contact pin are positioned so as to project outward through one and another through holes, respectively, formed to the socket body and bent and inclined in a same direction as the flexed direction with respect to a perpendicular direction.
In a further preferred aspect, there is provided a socket for an electrical part comprising:
a socket body having a base portion and an upper plate disposed above the base portion; the socket body being provided with a number of contact pins which contact terminals of the electrical part for electrical connection between the terminals and a printed circuit board;
an open/close member mounted to the base portion of the socket body to be pivotal with respect thereto; and
a pressing member mounted to the open/close member for pressing the electrical part,
each of the contact pins having one end portion which electrically contacts the terminal of the electrical part, another one end portion which electrically contacts the printed circuit board and an elastic portion between the one and another end portions of the contact pin so as to be flexed in one direction, and the one and another end portions of the contact pin being positioned, so as to project outward through one through hole formed to the upper plate and through another one through hole formed to the base portion, respectively, and bent and inclined in a same direction as the flexed direction with respect to a perpendicular direction.
In the above respective aspect, the elastic portion may have an arcuate shape, angled bent shape or substantially S-shape flexed in a direction with respect to the perpendicular direction.
According to the structures of the present invention mentioned above, the contact pin is composed of the one (upper) end portion, the other (lower) end portion and the intermediate elastic portion which is flexed in one direction with respect to the perpendicular direction. The upper end portion of the contact pin projects upward through the upper through hole formed to the socket body (upper plate) to be bent and inclined in the same direction as the flexed direction of the elastic portion.
Therefore, when the upper end portion of the contact pin is pressed downward, the elastic portion is flexed and deformed downward, and at its
Enplas Corporation
Nguyen Khiem
Staas & Halsey , LLP
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