JPH0747827Y2 - IC socket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an IC socket.

(Prior Art) The contact pin of an IC socket, which is used for a conventional IC socket in which the lead terminals of the IC are arranged on a plane, is generally a so-called cantilever type, and its contact portion has a free end. On the side. For this reason, the contact pressure between the lead terminal and the contact portion is obtained by the elasticity of the portion between the contact portion and the leg portion which is inserted and fixed in the base of the IC socket.

However, since the pushing down stroke of the IC package that is placed, pushed down, and brought into contact with each other is small, a large contact pressure cannot be secured between the lead terminal and the contact portion.

In order to solve this problem, the applicant of the present invention is
No. 0 proposed an IC socket capable of taking a large contact pressure. This is a cross-sectional view of the conventional improved IC socket shown in FIGS. 5, 6 and 7 and a configuration diagram of a leg portion of a contact pin.

First, FIG. 5 will be described. The contact pin 23 is manufactured by stamping a spring material (plate), and has a curved portion.
One end of 23a is bent to form a leg portion 23c, and a locking piece 23d shown in FIG. 7 is provided in the middle of the leg portion 23c so as to project. The other end of the curved portion 23a is a contact portion 23b. Attach the contact pins 23 to the base 21a of the socket body 21 at regular intervals.
When 3c is inserted, as shown in FIG. 7, the locking piece 23d protruding from the leg portion 23c prevents it from coming off and is fixed. The base 21a is inserted from the lower side of the socket body 21, and the socket body 21 and the base 21a are fixed with bolts, nuts and the like.
At this time, a part of the contact portion 23b of the contact pin 23 comes into contact with the peripheral portion of the mounting hole 21b of the IC package on the upper surface of the socket body 21, and the other portion of the contact portion 23b is exposed in the mounting hole 21b. . In this case, since the contact portion 23b is shaped so as to be pushed down at the peripheral portion of the mounting hole 21b, the contact pin 23 is in a state of being biased by the elasticity of the curved portion 23a.

Therefore, since the IC package is already energized even when it is not placed, a sufficient contact pressure can be obtained even when the IC package is placed and slightly pushed down by a certain stroke.

FIG. 6 shows another embodiment, in which the contact portion 23b 'of the contact pin 23' is completely exposed inside the mounting hole 21b 'of the socket body 21' and inside the contact portion 23b '(contact portion 23b'). ′ And curved part
(Between 23a ') and the peripheral portion of the mounting hole 21b'
23a 'is in the activated state. Others are basically the same as in the case of FIG. 5, and the description thereof will be omitted.

(Problems to be Solved by the Invention) Since the contact pin 23 (23 ') having the above-described shape has only one urging curved portion, the spring property is easily fatigued and the life is short.

Further, since the plate is punched, the material use efficiency is low and the cost merit is small.

It is an object of the present invention to solve the above problems and provide an IC socket with a contact pin that has a long life and is inexpensive.

(Means for Solving the Problem) In order to achieve the above-mentioned object, in order to regulate the position of the contact pin 15 which comes into contact with the lead terminal L of the IC package P, the insertion holes 2a are formed in rows at regular intervals. In order to arrange the contact pin 15 in parallel with the provided base 2, there is provided a groove 3a which is provided at the same interval as the insertion hole 2a and is formed in parallel with the inside of the socket from the position of the insertion hole 2a. In order to prevent contact between the contact pins 15 whose left and right directions are regulated by the groove 3a, the contact pins 15 are clamped and fixed by the cover 3 provided with a partition wall 5 protruding inwardly between the contact pins 15. The socket body 1 and the lead terminal L are pushed down to push the lead terminal L and the contact pin.
In an IC socket provided with a push-down body 8 and a pushing-down means composed of a lock lever 13 for making contact with the contact pin 15, the contact pin 15 is made of an elastic metal obtained by bending a round bar having a circular cross section, and the base of the IC socket A linear arm portion 15d that is bent inward at a right angle by a first bent portion 15c at the upper end of the leg portion 15b inserted into the two insertion holes 2a, and is fixed by the groove 3a and the base 2; From the second bent portion 15e at the tip end of the arm portion 15d, a mountain-shaped arc-shaped curve is projected upward, and the top contact portion 15f is in contact with the lead terminal L, and the base portion is further extended from this contact portion 15f. 2 includes a contact portion 15g whose tip portion is curved downwardly in an arcuate shape so as to slidably contact the contact portion 15g, and the contact portion 15f is moved downward by the pushing means via the lead terminal L. When pressed by the contact portion 15g, the contact portion 15g The by the contact portion 15f of the slides arc is elastically deformed, the contact portions 15f of the lead terminals L and the contact pin 15 is intended to make electrical contact pressing sliding.

(Function) The contact with the lead terminal L is not held in the floating state as in the conventional case, but is held at three points on the contact portion 15g, the second bent portion 15e, and the first bent portion 15c side. Since the elastic force is obtained by elastic deformation of the two bent portions 15e and the contact portion 15f,
Since a strong contact pressure is obtained and the elastic deformation is dispersed at two points as described above, the fatigue deformation of the contact pin 15 is small and the life is long.

(Embodiment) FIG. 1 and FIG. 2 are sectional views of the main part of the IC socket of the present invention.
1 shows a state in which the IC package P is placed and locked in a used state, and FIG. 2 shows a state in which the IC package P is placed and immediately before the IC package P is pushed down by the pusher 8. FIG. 3 is a configuration diagram of the contact pin 15.

In FIG. 1 and FIG. 2, a flange 6 is provided at one end of the base 2, and a pressing body 8 having a pressing projection 9 on the lower surface and a locking recess 10 on the upper surface is pivotally supported on the flange 6 by a shaft 7. A flange 11 is provided on the other end opposite to the one end, and a lock lever 13 provided with a locking projection 14 is pivotally supported on the flange 11 by a shaft 12. Since the partition wall 5 for the lead terminal L is provided on the cover 3 on the upper side of the base 2 as in the conventional example, detailed description thereof will be omitted.

Next, the contact pin of the IC socket of the present invention will be described. The contact pin 15 is formed by bending a thin round bar of elastic metal, and has a structure as shown in FIG. That is, one end of the arm portion 15d is bent at a right angle by the first bent portion 15c, and its tip becomes a leg portion 15b, which is inserted into the insertion hole 2a of the base 2. The tips of the legs 15b serve as connection terminals 15a. The other end of the arm portion 15d is connected to the arm portion 15d and the leg portion.
On the plane determined by 15b, the second bent portion 15e is bent diagonally upward in the opposite direction to the leg portion 15b, and then the base 2 is bent.
The contact portion 15f is formed by curving obliquely downward toward the side, and the tip thereof is curved obliquely upward by the reverse of the contact portion 15f to form a contact portion 15g.

The above-mentioned contact pin 15 has its leg portion 15b inserted into the insertion hole 2a provided in the base 2 of the socket body 1, and the cover 3 having the groove 3a provided at a position corresponding to the contact pin 15 from the upper side thereof. It is mounted and fixed to the base 2 together with the cover 3 with bolts 16 and nuts 17. The positions of the insertion hole 2a and the groove 3a are determined so that the contact pin 15 is located in the middle of the partition walls 5 and 5 of the cover 3 in such a state.

Next, the operation of the contact pin 15 will be described. When the IC package P is placed and the lead terminals L are pushed down by the pressing projections 9, the state shown in FIG.
It becomes the state of the chain line in the figure. In this case, the second bent portion 15e
And the contact portion 15f are extended in a direction approaching a straight line. As a result, the restoring force of the contact pin 15 is supported by the contact portion 15g, the second bent portion 15e, and the first bent portion 15c at three points, and the elasticity of the second bent portion 15e and the contact portion 15f at two points. Since it is generated by the deformation, not only a larger restoring force can be obtained than the conventional contact pin whose one end is a free end, but also fatigue deformation does not occur much.

In addition, when a large movement stroke is required to push down the IC package P, even if the contact portion 15g is lifted from the base 2 because the angle of the second bent portion 15e is small (a direction close to a right angle). good. However, even in this case,
When the IC package P is pushed down, the contact portion 15g needs to be in contact with the base 2 and pressed against it.

FIG. 4 shows another embodiment of the present invention, in which the base 2
Place the printed wiring board 18 directly in this position, omitting
The contact pin 15 'directly contacts the printed wiring pattern 18a. In this case, the contact pin 15 'is bent obliquely downward from the arm portion 15d',
It is necessary that the second bent portion 15e 'is bent obliquely upward. First bent portion 15c ', contact portion 15f', contact portion 15
g'is curved like the first bent portion 15c, the contact portion 15f, and the contact portion 15g. Furthermore, the length of the leg portion 15b 'is 1
It is necessary that the distance between 5d 'and the second bent portion 15e' is shorter than the vertical distance.

In this case, the socket body 19 is provided with an insertion hole 19a into which the short leg portion 15b 'of the contact pin 15' is inserted and a groove 19b into which the arm portion 15d 'is inserted. From the upper side, the contact pin 15 'is fixed by the cover 20 provided with the partition wall 5.

The contact pins 15 and 15 'in the above embodiment are
Instead of the round bar, an elastic metal plate material may be used and formed by punching.

(Effect of the device) As described above, the contact pin 15 has the insertion hole 2a of the base 2.
The leg part 15b is positioned by and the groove 3 of the cover 3
Since the arm portion 15d is positioned on the base 2 at a, and the contact portion 15f is separated from the adjacent contact pin 15 by the partition wall 5, the contact pin 15 can be locked without swinging.

The restoring force of the contact pin 15 is the contact portion 15g, the second bent portion 1
Since it is supported at three points, 5e and the first bent portion 15c, a greater restoring force can be obtained than when one end is a free end.

Also, like the conventional contact pins 23, 23 ', the locking piece 23d
Is unnecessary, and insertion into the insertion hole 2a is easy.

Further, when the contact pin is formed by bending the round bar, there is no waste of material and the manufacturing can be performed at low cost.

[Brief description of drawings]

1 is a sectional view of an essential part of an IC socket of the present invention (a state diagram in which a lead terminal is pressed), FIG. 2 is a state diagram immediately before pressing the lead terminal, FIG. 3 is a configuration diagram of a contact pin, and FIG.
The figure is a cross-sectional view of a main part of a modified example of the IC socket of the present invention.
FIG. 6 is a sectional view of a main part of a conventional improved IC socket, and FIG. 7 is a configuration diagram of a leg portion of a conventional contact pin. P: IC package, L: lead terminal, 1: socket body, 2: base, 2a: insertion hole, 3: cover, 3a: groove, 15: contact pin, 15b: leg part, 15c: first bent part, 15d: Arm part, 15e:
Second bent portion, 15f: contact portion, 15g: contact portion.

Claims (1)

[Scope of utility model registration request] 1. A base in which insertion holes are formed in rows at regular intervals to regulate the position of a contact pin that comes into contact with a lead terminal of an IC package, and the contact pin is arranged in parallel. There is a groove formed in parallel with the inside of the socket from the position of the insertion hole at the same interval as the insertion hole, and in order to prevent contact between the contact pins regulated in the left-right direction by the groove, A socket body for sandwiching and fixing the contact pin with a cover provided with a partition wall protruding inwardly, and a pressing body and a lock lever for pushing down the lead terminal to bring the lead terminal and the contact pin into contact with each other. In the IC socket provided with the pressing means, the contact pin is made of elastic metal formed by bending a round bar having a circular cross section, and The first bent portion at the upper end of the leg portion inserted into the insertion hole of the slot is bent straight inward at a right angle, and is fixed by the groove and the base. 2 a curved portion protruding upward from the bent portion in the shape of a mountain arc, and a tip contact portion that comes into contact with the lead terminal, and a tip portion that extends further from this contact portion and slidably contacts the base. When the contact portion is pressed downward by the pushing-down means via the lead terminal, the contact portion moves above the base. An IC socket characterized in that the contact portions of the lead terminals and the contact pins are electrically pressed and slid into contact by sliding and elastically deforming the arc-shaped contact portions.