Socket for electrical parts

Details Socket for electrical parts Socket for electrical parts

1999-06-29

2001-10-02

Nguyen, Khiem (Department: 2839)

Electrical connectors

Coupling part having handle or means to move contact...

Expandable, prong receiving socket

C439S331000

Reexamination Certificate

active

06296505

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a socket for electrical parts for detachably holding an electrical part such as semiconductor device (called as “IC package” hereinlater).
In a known art, as “socket for electrical parts” in this kind, there is provided an IC socket for detachably holding an IC package as “electrical part” such as disclosed in Japanese Utility Model Publication No. HEI 6-44050.
One known example of an IC socket of this kind is shown in
FIGS. 35A and 35B
. The shown IC socket is provided with a contact pin
1
to which a pair of clamping pieces
1
a
are formed. The clamping pieces
1
a
are each formed with a contact portion
1
b
contacting to or separating from a connection pin P of an IC package, not shown, and also formed with a press portion
1
c
which is pressed by a cam portion
3
a
of a movable plate
3
.
The cam portion
3
a
is inserted into a space between a pair of press portions
1
c
, and as shown in
FIG. 35A
, when the movable plate
3
is depressed, the paired press portions
1
c
are depressed and widened. Under this state, the connection pin P is inserted into the contact portions
1
b
through an insertion hole
4
a
formed to a cover
4
.
Next, as shown in
FIG. 35B
, when the movable plate
3
is raised upward, the cam portion
3
a
is moved upward, and the connection pin P is clamped by and between the paired contact portions
1
b
thereby to establish an electrical connection therebetween.
According to the structure mentioned above, the IC package can be mounted or dismounted, without giving no specific insertion or withdrawal force, only by moving upward or downward the movable plate
3
, thus improving a working efficiency.
However, in such structure of the conventional IC socket, a pair of contact portions
1
b
are depressed and widened by inserting the cam portion
3
a
between a pair of press portions
1
c
of each of the contact pins
1
, and accordingly, it is necessary to insert the cam portion
3
a
into the paired press portions
1
c
at the time of arranging the contact pin
1
and the movable plate
3
, which results in an adverse workability at an assembling time, and it is also disadvantageous to arrange the contact pins
1
with narrow pitch.
Furthermore, in the prior art mentioned above, the connection pin P of the IC package is held between the contact portions
1
b
of the paired clamping pieces
1
a
to achieve an electrical connection. However, because this clamping structure does not attain a wiping effect, it is difficult to realize a stable electrical contacting condition.
In the known art, there is also provided an IC socket of the kind mentioned above such as disclosed in Japanese Patent Publication No. HEI 3-66787 showing an IC package as “electrical part”, in which a number of IC leads are formed so as to project downward from a lower surface of the IC package, and these IC leads are arranged in grid shape having vertical (Y-axis direction) and horizontal (X-axis direction) rows.
An IC socket, as “socket for electrical parts”, achieving the electrical connection by holding such IC package has an outer rectangular peripheral portion formed of an insulation material and has a substrate on which a cover member is applied to be horizontally movable.
This cover member is formed with a number of IC lead insertion holes having an arrangement corresponding to the grid shaped IC lead arrangement so that the arrangement of the IC lead insertion holes provides a parallelogram shape, and the vertical rows (Y) and horizontal rows (X) of the IC leads are inclined at angles of 45° with respect to the respective side lines of the rectangular outer shape of the cover member. Furthermore, the substrate of the IC socket is formed with a number of contact members having an arrangement corresponding to the arrangements of the IC leads and the IC lead insertion holes.
In such structure, when the cover member is moved in one diagonal direction of the IC lead grid arrangement, the IC package mounted to the cover member is also moved and, hence, the IC leads are separated from or contacted to the contact members.
However, in such conventional structure, in order to ensure displacement or shift amount of the contact member with respect to the IC lead, the arrangement of the IC lead insertion holes is inclined at angles of 45° with respect to the rectangular outer shape of the cover member. Accordingly, the cover member, and hence, an entire structure of the IC socket device has been made large, thus being disadvantageous and providing a problem.
SUMMARY OF THE INVENTION
A primary 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 having a structure capable of improving a assembling workability of structural elements or members and being advantageous for narrow pitch arrangement of contact pins.
Another object of the present invention is to provide a socket for electrical parts capable of achieving an improved wiping effect at a time of contacting a contact pin to a terminal and achieving an improved contacting stability.
A further object of the present invention is to provide a socket for electrical parts capable of making compact an entire structure thereof while ensuring a displacement amount of contact pins.
These and other objects can be achieved according to the present invention by providing, in one aspect, a socket for an electrical part comprising:
a socket body having a mount portion on which an electrical part having terminals is mounted;
a number of contact pins to be contacted to or separated from the terminals of the electrical part; and
a movable plate disposed to the socket body to be movable perpendicularly with respect to the mount portion in a usable state of the socket,
wherein each of the contact pins has a pair of elastic pieces formed, at front end portions thereof, with contact portions which are opened or closed in accordance with the movement of the movable plate thereby to establish an electrical connection between the contact portions and the terminals of the electrical part when the contact portions are closed, the movable plate is provided with cam portions arranged between adjacent contact pins, respectively, and when the movable plate is moved, the elastic pieces are pressed by a pair of cam portions disposed on both the sides of each of the contact pins thereby to open the contact portions.
In a preferred embodiment of this aspect, the paired elastic pieces of the contact pin are formed with bent portions, respectively, in a manner that the bent shapes of both the bent portions are opposed and cross to each other and the bent portions are pressed by the cam portion of the movable plate thereby to open the contact portions of the elastic pieces of the contact pin.
The elastic pieces of both the adjacent contact pins are pressed by one cam portion of the movable plate disposed between the elastic pieces of the adjacent contact pins. The paired elastic pieces of the contact pin has a common base portion and the elastic pieces are opposed to each other by bending the base portion.
The contact pin is provided with a solder tail portion extending from the base portion of the elastic pieces in a direction opposing to the elastic pieces, the solder tail portion is formed with a bent portion near the base portion of the elastic pieces so that a center line of the paired elastic pieces accords with a center line of the solder tail portion.
The contact pins are arranged in matrix shape in a manner that the paired contact portions of the respective contact pins have displaced direction having predetermined angles, preferably of 45°, with respect to an arrangement direction of the contact pins.
Each of the terminal of the electrical part has a spherical outer shape and the paired contact portions of the contact pin are positioned on a diametral line of the spherical terminal on both sides thereof.
Each of the terminal of the electrical part has a spherical outer sha

Affiliated with

Also associated with

Rating

Socket for electrical parts does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Socket for electrical parts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Socket for electrical parts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2606207