JPH09251883A - Ic socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an IC socket capable of simply assembling a contact pin to a socket body and easily connecting the contact pin to an electrode terminal of a printed circuit board. SOLUTION: A contact pin to be assembled to socket bodies 1 and 2 is provided with a disk part 3a' at one end of a base part 3a, and a tip end part 3d' of a connection terminal part 3a' extending downward from the other end of said base part is so constituted as to be curved in the arc shape and to be elastically deformed. The disk part 3a' is engaged with a recess 1c'' provided on the bottom of a mounting groove formed at the socket body, and the base part 3a and the connection terminal part 3d are roughly J-shaped so that a portion of the socket body can be elastically embraced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC socket used for testing electric parts such as IC packages,
Particularly, it relates to a burn-in IC socket.

[0002]

2. Description of the Related Art In an IC socket, a base portion fixed to a socket body, a contact portion which is in pressure contact with a lead terminal of a loaded IC package, a spring portion formed between the base portion and the contact portion, and the base portion. A plurality of contact pins having a connecting terminal portion extending in the opposite direction from the contact portion are arranged in rows, and the base portion is fixed by press-fitting the connecting terminal portion into the hole of the socket body or by a protrusion protruding from the base portion. The connection terminal portion is formed as a rigid rod-shaped member that extends linearly downward from the base portion.

[0003]

Conventionally, when this is used as a burn-in socket, the electrical connection between the connection terminal portion and the electrode terminal of the printed circuit board is made through a small hole (through hole) provided in the board. This is done by inserting the tip portion of the connection terminal portion and then soldering. Therefore, there is a problem that it takes a relatively long time to connect the IC socket to the printed circuit board. Further, there is a problem that the assembling work of arranging the contact pins in a row on the socket body is relatively complicated and time-consuming.

The present invention has been made in view of the above problems of the conventional IC socket, and an object of the present invention is to easily assemble the contact pin to the socket body and to print it. An object of the present invention is to provide an IC socket in which contact pins can be easily connected to electrode terminals of a circuit board.

[0005]

In order to achieve the above object, an IC socket according to the present invention comprises a base portion fixed to a socket body, a contact portion for press-contacting a lead terminal of an IC package, and a base portion and a contact portion. In an IC socket comprising a plurality of contact pins having a spring portion formed between them and a connection terminal portion extending from a base portion in a direction opposite to the contact portion, the tip portion of the connection terminal portion is formed in an arc shape. It is characterized in that it is configured to be curved and elastically deformable.

Further, according to the present invention, in the IC socket having the above structure, the socket body and the base are fixed by fitting the disk portion formed at the end of the base and the arcuate recess formed in the socket body. Along with that, the base is clamped and fixed to the socket body by the frame, and the other end of the base extending from the end of the base and the connection terminal form a substantially J shape. It is characterized in that it is formed so as to elastically hold the socket body by the J-shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to an illustrated example. 1 is a plan view of an IC socket, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a perspective view of a base portion of a socket body, and FIG. 4 is a contact pin mounting groove portion provided in the base portion. FIG. 5 is a partially enlarged perspective view, FIG. 5 is a perspective view of the frame body portion of the socket body, FIG. 6 is a partially enlarged perspective view of a contact pin mounting groove portion provided in the frame body portion, and FIG. 7 is an enlarged side view of the contact pin. FIG. 8 is an enlarged view for explaining the operation process of the contact pin pressing member.

In the figure, reference numeral 1 denotes a stepped opening 1a in the central portion, a projecting portion 1b having an arcuate cross-section at the peripheral edge of the lower surface, and a large number of insulating ribs 1c (FIG. 4) arranged on each of four side surfaces. A base portion of the socket body having a rectangular planar shape, which has wall portions 1d standing adjacent to the inner ends of the ribs 1c and mounting holes 1e formed at four corners, respectively, is shown in FIG. As described above, the bottom of each groove defined by the insulating rib 1c has a flat portion 1c 'extending inward from the outer end and an arc-shaped recess 1c "continuing from the inner end of the flat portion 1c'. Made of.

In the figure, reference numeral 2 is formed so that the outer shape and the mounting hole 2a are aligned with the outer shape of the base portion 1 and the mounting hole 1e when they are stacked on the base portion 1, respectively. The inner side surface is erected on the outer side surface so as to face the body at a predetermined interval, and a large number of insulating ribs 2b (FIG. 6) aligned with the insulating ribs 1c of the base portion 1 are arranged in a row on the inner side. Is a frame portion to the socket main body in which the mounting holes 2c, 2c are formed in the respective portions and the wall portions 2e are formed in which the mounting holes 2d are formed in the central portion, respectively, and are defined by insulating ribs 2b as shown in FIG. The bottom of each groove formed is a curved portion 2b 'directed from the inner side surface of the wall portion 2e toward the inside, and a vertical portion 2 continuing to the inner end of this curved portion.
It consists of b ″.

In FIGS. 1, 2 and 7, 3 is formed by pressing a thin plate of phosphor bronze, beryllium copper or the like, and is a flat portion 1c of the groove bottom defined by the insulating rib 1c of the base portion 1. Are formed between the base portion 3a and the contact portion 3b, the base portion 3a and the disc portion 3a 'which are respectively inserted into the circular recessed portion 1c "and the arc-shaped recess portion 1c", the contact portion 3b which is in pressure contact with a lead terminal of an IC package described later. And the spring portion 3c abutting on the curved portion 2b 'of the groove bottom defined by the insulating rib 2b of the frame body portion 2 and the tip portion 3d' of the leg portion are curved in an arc shape and cooperate with the base portion 3a. And a connection terminal portion 3d that forms a substantially J-shape.The tip end portion 3d 'of the leg portion is an arc of the jetty portion 1b of the base portion 1 in the normal state as shown in FIG. An arc is formed at a position slightly separated from the surface The J-shape is incorporated so that the connecting terminal portion 3d is preferably formed so as to be slightly biased inward in the normal state. At this time, the side portion of the base portion 1 is elastically held by the cooperative action with the disc portion 3a ', whereby the contact pin 3 is temporarily fixed in the state shown in FIG.

In FIGS. 1 and 2, reference numeral 4 is vertically movably housed in a rectangular space defined by a wall portion 1d of a base portion 1, and is moved upward by a well-known locking mechanism (not shown). A mounting table 4a for mounting the IC package, a guide projection 4b set at four corners for guiding the IC package into the mounting table 4a when the IC package is loaded, and a central portion. Opening 4 formed in
c is a floating member, 5 is a spring interposed between the base member 1 and the floating member 4 and elastically presses the floating member 4 upward, and 6 is provided on each wall 2e of the frame body 2. And a pair of protrusions 6b (only one is shown) formed at both ends in the longitudinal direction are attached to the mounting hole 2
The fixing pin 6a provided at the central portion is attached to each of the c and 2c by snap-fitting in the attachment hole 2d, and the cross-sectional shape that gives the habit of ammunition in the direction in which the opening end is closed. A horizontal U-shaped leaf spring, 7 is inserted into each leaf spring 6 and has a pressing edge 7a and rod portions 7b protruding from both end faces, and a cross-sectional contour similar to the inner shape of the leaf spring 6. And P is an IC package having a large number of lead terminals L on four sides.

As shown in FIG. 8, in the leaf spring 6, when the pressing member 7 is pushed out from the solid line position (normal position) to the chain line position by an appropriate means, the pressing edge 7a is placed on the mounting table of the floating member 4. IC package P mounted on 4a
The lead terminal L of the contact pin 3 from above
pressing towards b, thereby floating member 4
While lowering, the elastic force is induced to a position where an appropriate contact pressure between the lead terminal L and the contact pin 3 is obtained, and when it is moved from that position (chain line position) to the solid line position by appropriate means, The relative shape to the pressing member 7 is selected so that the solid line position can be accurately guided.

Next, an example of a method of assembling the IC socket and attaching it to the printed circuit board will be described.
First, the contact pins 3 are provided in a row on the base portion 1. In this case, when the contact pin 3 is fully pushed from the outside into the groove defined by the insulating rib 1c from the disk portion 3a 'to the base portion 3a, the tip portion 3d' of the connection terminal portion 3d is slightly expanded and the base body is slightly expanded. The disk portion 3a 'is fitted into the arcuate recessed portion 1c "and the contact pin 3 is temporarily fixed to the base body portion 1 at the same time when the disk portion 3a' is fitted over the jetty portion 1b of the portion 1 with a slight clearance.

Next, the frame portion 2 is superposed on the base portion 1 while inserting the spring portions 3c of the contact pins 3 into the grooves defined by the insulating ribs 2a, and the through holes are provided through the holes 2a and 1e. The rivets are inserted and caulked to integrate them. As a result, the base 3a of each contact pin 3 is clamped and fixed by the base 1 and the frame 2. Thereafter, the base portion 1 and the frame portion 2 are integrated with the printed circuit board by screwing a bolt (not shown) from above in common with a mounting hole provided in the printed circuit board (not shown) through the through hole of the rivet. Be converted. At this time, the tip portion 3d 'of the connection terminal portion 3d of each contact pin 3 comes into contact with the corresponding electrode terminal of the printed circuit board with an appropriate pressure contact force, and electrical connection with the printed circuit board is performed.

Next, with the pressing member 7 incorporated in the leaf spring 6, the projection 6b is inserted in the mounting hole 2c and the fixing pin 6a is formed.
The plate springs 6 are
Is attached to the frame portion 2 together with the pressing member 7. Next, with the spring 5 interposed between the base member 1 and the floating member 4, the hook member (not shown) that can move up and down within a certain range is locked to the base member 1 and attached to the base member 1. The assembly of the IC socket and the mounting of the IC socket on the printed circuit board are completed. The assembly order described above is merely an example, and the present invention is not limited to this.

Next, a method of using this IC socket will be described. When the IC package P is loaded, if the IC package P is placed in the mounting table 4a of the floating member 4 from above, each corner of the IC package is guided by each of the guide protrusions 4b, and the regular position on the mounting table 4a is obtained. Placed in the position. In this state, if the pressing members 7 are moved inward by a predetermined amount against the elastic force of the leaf springs 6 via the rod portions 7b, the pressing members 7 are guided by the leaf springs 6. Each pressing edge 7a is advanced to the position shown by the chain line in FIG.
Presses the lead terminals L in each row of the IC package P against the contact portions 3b of the corresponding contact pins to surely electrically connect them. This connection state is appropriately maintained by the pressing force of the leaf spring 6 and the reaction force due to the elastic deformation of the spring portion 3c of each contact pin 3.

When the IC package P is taken out, each pressing member 7 is moved outwardly against the elastic force of each leaf spring 6 via each rod portion 7b and brought to the position shown in FIG. You can do it. The pressing members 7 can be moved all at once by using an appropriate vertically movable jig or the like having a cam surface C that is in sliding contact with each rod portion 7b as shown by the broken line in FIG.

[0018]

As described above, according to the present invention, the contact pin can be brought into contact with the electrode terminal of the printed circuit board with an appropriate contact pressure by mounting the socket body on the printed circuit board. There is an advantage in that the soldering with and the need for soldering equipment are unnecessary. Therefore, even if a defective product is generated in the IC socket, the IC socket can be easily converted, and the printed circuit board can be replaced even when the IC socket has a defect or when the IC socket is replaced due to the life of the IC socket. There is also an advantage that it can be reused.

Further, according to the present invention, since the contact pin is formed so as to elastically hold a part of the socket body, the contact pin can be easily assembled by temporarily fixing it to the socket body. There is an advantage that it can be broken.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of an IC socket according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a perspective view of a base portion of the IC socket shown in FIG.

FIG. 4 is a partially enlarged perspective view of a contact pin mounting groove portion provided in a base portion.

5 is a perspective view of a frame body portion of the IC socket shown in FIG.

FIG. 6 is a partially enlarged perspective view of a contact pin attachment groove portion provided in the frame body portion.

FIG. 7 is an enlarged side view of a contact pin.

FIG. 8 is an enlarged view for explaining the operation process of the contact pin pressing member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base part of socket body 1a Stepped opening 1b Jetty part 1c, 2b Insulation rib 1c 'Flat part 1c "Recessed part 1d, 2e Wall part 1e, 2a, 2c, 2d Mounting hole 2 Frame part 2b' Curved part 2b" Vertical part 3 Contact pin 3a Base part 3a 'Disc part 3b Contact part 3c Spring part 3d Terminal part 3d' Leg tip part 4 Floating member 4a Mounting table 4b Guide protrusion 4c Opening 5 Spring 6 Leaf spring 6a Protrusion 6b Fixing pin 7 Pressing member 7a Pressing edge 7b Rod part PIC package L Lead terminal

Claims (2)

[Claims] 1. A base fixed to a socket body and an IC
A large number of contact pins having a contact portion that is pressed against the lead terminal of the package, a spring portion formed between the base portion and the contact portion, and a connection terminal portion that extends from the base portion in a direction opposite to the contact portion are arranged. An IC socket comprising: an IC socket, wherein a tip end portion of the connection terminal portion is curved in an arc shape and elastically deformable. 2. A base fixed to a socket body and an IC
A large number of contact pins having a contact portion that is pressed against the lead terminal of the package, a spring portion formed between the base portion and the contact portion, and a connection terminal portion that extends from the base portion in a direction opposite to the contact portion are arranged. In an IC socket that is provided, the socket body and the base are fixed to each other by fitting a disk portion formed at the end of the base and an arcuate recess formed in the socket body, and by connecting the base portion to the socket by the frame body portion. This is achieved by sandwiching and fixing it to the main body, and a substantially J-shape is formed by the base portion and the connection terminal portion.
An IC socket characterized in that the socket body is elastically held by a shape.