JPH07161422A - Ic socket - Google Patents

Abstract

PURPOSE:To obtain an IC socket in which electrical contact is always kept good 6K without having influence of an oxide cover film on the surface of an IC lead. CONSTITUTION:A spring part 5b for forcing a contact part 5a into an IC socket is provided in a contact pin 5, and a cam 37 cooperating with a slave part 5c is provided and the contact part 5a is reciprocated with rubbing the IC lead by cooperation of the slave part and the cam 37. The oxide cover film is cleansed and removed whenever ICs are attached and detached.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an IC socket.

[0002]

2. Description of the Related Art IC sockets are used in automatic inspection devices for conducting electrical tests of IC packages (hereinafter simply referred to as ICs). FIG. 13 is Japanese Patent Laid-Open No. 4-1540.
FIG. 14 to FIG. 1 are perspective views of the IC socket described in Japanese Patent No. 65.
6 is a partial cross-sectional view showing the internal structure of the main part of the conventional example and its operation. In these figures, the base member 1 has a central opening 2 opening on the upper surface and the lower surface thereof, and an IC accommodation portion 3 is provided on the upper surface side of the central opening 2, and the accommodation portion 3
Multiple contacts 4 along at least two opposite sides of the
Are arranged in parallel.

The contact 4 is provided on the base member 1 and includes a contactor 5 projecting downward from the lower surface of the base member 1. A flat plate portion 6 is provided so as to be connected to these contacts 5, and the flat plate portion 6 is supported by the upper surface of the planting wall of the contact 4 and rises vertically, and a spring portion 7 is provided from the upper inner wall of the flat plate portion 6. Connect. The spring portion 7 is the flat plate portion 6
It is a curved type that extends downward from the connection portion (base portion 8) with and folds back upward and reaches the vicinity of the connection portion. That is, the spring portion 7 is of a downwardly curved type, and a certain small gap 10 is formed between the base portion 8 and the tip 9 extending from the base portion 8 and the bending angle is set so as to open upward. A contact arm 11 inclined inwardly at the tip 9 of the curved spring portion 7.
And a contact protrusion 12 that protrudes inward and is directed downward is connected to the tip of the contact arm 11.

As shown in FIG. 14, the spring portion 7 urges the contact arm 11 and the contact protrusion 12 inward, and IC
It acts so as to contact the lead 25 of 23. Further, the latch portion 13 is provided outward from the tip of the arm 11, that is, the connecting portion between the arm 11 and the contact protrusion 12.
Is extended, and the rotation lever 14 is attached to the free end of the latch portion 13.
The action part 15 of is engaged. The latch portion 13 and the contact protrusion 12 are arranged at the free ends of the contacts and extend in opposite directions. As shown in FIG. 13, the rotation lever 14
Has an operating portion 16 extending parallel to the row of the contacts 4 and extending outwardly at one end thereof, and an operating portion 15 engaging with the latch portion 13 at the other end thereof. Has been formed. The rotating lever 14, its operating portion 16 and action portion 15 extend outside the contact arm 11 so as to be parallel to the row of contacts 4 and move up and down with an axis P parallel to the row of contacts 4 as a fulcrum. It is installed so that it can rotate. A shaft portion 17 protruding toward the axis P is provided at both ends of the rotating lever 14, and the shaft portion 17 is engaged with a bearing portion 18 formed on the base 1 for rotation.
The bearing 18 is provided with a recessed portion 19 which opens upward, and the shaft portion 17 is engaged with the recessed portion 19 to support the turning lever 14, and the support lever 18 can be pulled out and removed as necessary. Is done. Further, the bearing 18 can be mounted by dropping the shaft portion 17 from above the recessed portion 19.

An engaging groove 20 extending parallel to the row of contacts 4 is formed on the upper surface of the action portion 15 of the rotating lever 14.
A hook-shaped bent tip of the latch portion 13 of the contact 4 is dropped into the engaging groove 20 so as to have a slight play, whereby an external force of the latch portion 13 is applied to the action portion 15. I'm giving it. That is, all the latch portions 13 of the contact group in one row are engaged with the one engagement groove 20.

The rotating lever 14 is integrally molded of an insulating material and is formed at the time of molding the above-mentioned components 15, 16, 20, and 17.

In the conventional IC socket having the above structure, the IC is attached and detached as follows. First, IC
At the time of mounting, the operation unit 16 is pushed down by, for example, a robot. Then, the rotating lever 14 is rotated downward about the shaft portion 17 as a fulcrum, and the acting portion 15 pulls the latch portion 13 of the contact outward, whereby the contact 4 is moved outward against the elasticity of the spring portion 7. It is displaced to the side and moves to a position where it does not interfere with the leads 25 of the IC 23 inserted into the IC housing portion 3. Therefore, the IC can be inserted into the socket without load. When the insertion is finished, if the pressing force on the operating portion 16 is released, the rotating lever 14 is rotated upward by the elastic force of the spring portion 7 provided to the operating portion 15 to form a push-down standby state. At the same time, the contact arm 11 and the contact protrusion 12 of the contact 4 are urged by the spring portion 7 to be displaced inward, and come into pressure contact with the upper surface of the lead 25 of the IC.

When the IC 23 is detached from the socket, the contact 4 moves to a position where it does not interfere with the leads 25 of the IC 23 when the operating portion 16 is pushed down, so that the IC 23 is detached without load. be able to.

The IC socket disclosed in the above publication is IC23.
In the conventional IC socket, the contact pin is separated while directly pushing down the arm portion like the one disclosed in JP-A-1-143168. Let me I
The one in which C is easily attached and detached, and the one in which the contact pin of the presser cover is pressed to form a contact while the contact surfaces are displaced from each other, as in JP-A-63-62175. There is.

[0010]

Generally, in order to obtain good electrical contact between the IC lead and the contact pin of the IC socket, not only a simple contact pressure but also a low electrical resistance between the contact surfaces is required. An oxide film is formed on the surface of the IC lead, and when the contact pin contact portion is machined in the vertical direction and comes into contact with the contact pin, the contact between them becomes a contact through the oxide film, so that good electrical contact is made. Can't get Therefore, the contact pin contact portion is I
It is considered that the oxide film on the surface of the C lead is rubbed and contacted at an angle at which it can be removed so that good electrical contact is obtained. It is also considered that the contact portion of the contact pin enters the IC lead at an angle close to horizontal to enhance the effect of removing the oxide film by rubbing. The contact part and the IC lead come into contact, and the IC
The lead may be deformed.

Therefore, the IC of the contact portion of the contact pin is
The approach trajectory for the lead has become an important issue. Furthermore, it is unavoidable that there is a gap between the design stage and the case of actual fabrication. Further, in manufacturing the contact pin, measurement and evaluation are repeatedly performed, which requires a long time, which complicates design elements and makes designing difficult.

The most problematic factor in the IC manufacturing process is deformation of the IC leads. The largest cause of the deformation of the IC lead is considered to be the deformation when the IC is moved. Therefore, in the IC manufacturing process, the movement of the IC is performed by an automatic machine without any manual operation. An IC socket is used to mount an IC on the automatic machine, but in order to prevent damage to the IC lead, it is required to attach / detach the IC to / from the socket in an unloaded state. Therefore, in order to attach / detach the IC without load, I
When the C is attached or detached, the contact pin must be surely opened. To keep the contact pin open or to keep it open, the presser cover is pushed down by an automatic machine to displace the contact pin outward. It is preferable that the pressing force for displacing the contact pin outwardly be intentionally changed. Specifically, the contact pin is displaced under a constant load, the load gradually increases,
Some of them can obtain a desired displacement even if the load is gradually reduced, but it is particularly preferable that the contact pin has a small load for keeping it open.

The present invention has been made based on the above circumstances, and good electrical contact between the contact portion of the contact pin and the IC lead can be obtained, and the load required for opening and closing the contact pin can be set arbitrarily, and the design can be made. Provide an easy IC socket.

[0014]

An IC socket according to the present invention comprises a base member having a housing portion for an IC package, a plurality of contact pins erected on the base member along at least two sides of the housing portion, and In a socket having a pressing cover which is provided so as to be able to move forward and backward with respect to the bottom surface of a base member and which has a spring force applied upward, a base fixed to the base member is provided for the contact pin, and the housing is connected to the base A spring portion having elasticity toward the portion, a driven portion connected to the base through the spring portion and having a contact portion at an end portion on the accommodation portion side, and a shaft parallel to the row of the contact pins. A cam that is rotated about a center and that controls the movement of the contact portion with respect to the IC lead in cooperation with the driven portion. The cam rotates the cam by pressing down the pressing cover. Characterized in that attached the operating lever to be.

[0015]

In the IC socket of the present invention having the above structure,
When the pressing cover is pushed down, the cam is rotated and the contact pin is kept open, so that the IC can be attached / detached to / from the IC accommodating portion without load. If the pressure applied to the presser cover is stopped after inserting the IC, the presser cover and the operation lever are pushed up by the upward spring force applied to the operation lever, and the cam moves in the opposite direction to the above. Due to the elasticity of the spring portion of the contact pin, the contact portion comes into contact with the lead of the IC.

Since the contact portion of the contact pin moves forward and backward while rubbing against the IC lead, mounting of the IC,
Since the oxide film on the surface of the IC lead is cleaned and removed every time it is detached, good electrical contact can be obtained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 in which the same parts as those in FIGS. 13 to 16 are denoted by the same reference numerals is a sectional view of a contact pin in the advanced state of the first embodiment of the present invention, and FIG. It is sectional drawing in a state. In these figures, the base member 1 is provided with an IC housing portion 2, and contact pins 5 are planted along at least two sides of the IC housing portion 2 of the base member 1. These contact pins 5 are arranged at positions facing the leads 25 of the IC 23. The contact pin 5 is the IC lead 2
5, a contact portion 5a for contacting with 5, a spring portion 5b for imparting elasticity at the time of opening and closing, a driven portion 5c which is brought into contact with the cam 37 described later and moved by the cam 37, and a base portion 5d.

Reference numeral 34 in the drawing denotes a pressing cover which can be slid vertically. The cam 37 is rotatable about a fixed shaft 37a, and an operation lever 36 having its tip positioned immediately below the pressing cover 34 is fixed to the end surface of the cam 37. The cam 37 has a modified pentagonal shape with rounded corners. The modified pentagon is composed of three sides that are perpendicular to each other and two oblique sides that connect the vertices of two opposite sides of the three sides and obliquely intersect with each other. Has also been long. The shape of the driven portion 5c of the contact pin 5 is also determined according to the contour of the cam 37.

In the first embodiment having the above-mentioned structure, when the pressing cover 35 is pushed down in the state shown in FIG. 1, the operating lever 36 is pushed down and the cam 37 rotates, so that the driven portion 5c of the contact pin 5 causes the oblique side of the cam 37. Lifted up to
The contact portion 5a is retracted. The amount of this backward displacement is determined by the distance between the contact point of the contact pin 5 and the cam 37 and the fulcrum of the cam 37 (small distance described above → small displacement:
By setting the distance, it is possible to set an arbitrary displacement amount.

The load required for the displacement of the contact pin is the contact point between the contact pin 5 and the cam 37,
Since the distance is determined by the distance from the fulcrum of the cam 37 (small distance → load: large distance → large load), the load required to open / close the contact pin can be arbitrarily set by selecting the distance.

When the presser cover 34 is pushed down, the contact pin is kept open, so that the IC2
3 can be attached to and detached from the IC housing portion 2. If the pressurization to the presser cover 34 is stopped after inserting the IC,
The upward spring force exerted on the operating lever 36 by the spring 35 pushes up the operating lever 36 and returns to the state of FIG. 1, and the cam 37 rotates in the opposite direction to the spring portion 5b of the contact pin 5. Due to the elasticity of the contact part 5
a contacts the lead 25 of the IC 23.

In the above embodiment, since the contact portion 5a of the contact pin 5 advances and retreats while rubbing against the IC lead, the oxide film on the surface of the IC lead can be cleaned and removed every time the IC 23 is attached or detached. As such, good electrical contact is obtained.

FIG. 3 in which the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals is a sectional view of the second embodiment of the present invention when the contact pin is advanced, and FIG. 4 is the time when the contact pin of the above embodiment is retracted. FIG. In these figures, the operating lever 36
The tip of the and the presser cover 34 are connected by a link 38. Link 3 is provided between the presser cover 34 and the operation lever 36.
8 is interposed, and the movement of the presser cover 34 is transmitted to the operation lever 36 via the link 38.
The same effect as that of the embodiment can be obtained.

FIG. 5, in which the same parts as those in FIGS. 1 to 4 are designated by the same reference numerals, is a sectional view of the third embodiment of the present invention when the contact pin is advanced, and FIG. FIG. In these figures, the presser cover 34
A rack rod 39 hangs on the lower surface of the operation lever 36, and the tip of the operating lever 36 is a fan-shaped gear portion 36a having teeth that mesh with the rack rod 39. In this embodiment, the movement of the presser cover 34 is transmitted to the operating lever 36 via the rack rod 39 and the fan-shaped gear portion 36a, and the operation is the same as in the above-mentioned respective embodiments, and the same effect is obtained.

7 in which the same parts as those in FIGS. 1 to 6 are given the same symbols, FIG. 7 is a sectional view of the contact pin of the fourth embodiment of the present invention when it is advanced, and FIG. 8 is the contact pin of the above embodiment when it is retracted. FIG. In these figures, the driven portion 5c of the contact pin 5 is shown from the V-shaped apex to the anti-IC accommodation portion 2
The branch 5c ₁ perpendicular to the side is projected, and the cam 37
Is installed in the opposite direction to the first to third embodiments, that is, with the apex of the modified pentagon facing downward. In this embodiment, the pressing of the pressing cover 34 causes the cam 37, which is in contact with the upper surface of the driven portion 5c, to rotate, whereby the contact portion 5a of the contact pin 5 is retracted. Other operations are the same as those of the above-mentioned respective embodiments, and the same effect is obtained in the sectional view of the second embodiment of the present invention when the contact pin is advanced, and FIG. To be

9 in which the same parts as those in FIGS. 1 to 8 are denoted by the same reference numerals is a sectional view of the fifth embodiment of the present invention when the contact pin is advanced, and FIG. FIG. In these drawings, the operating lever 36 of the fourth embodiment is connected to the lower surface of the pressing cover 34 via a link 28. In this embodiment, the movement of the presser cover 34 is transmitted to the actuating lever 36 via the link 38, and the same operation as that in each of the above-described embodiments is performed and the same effect can be obtained.

11 in which the same parts as those in FIGS. 1 to 10 are denoted by the same reference numerals is a sectional view of a sixth embodiment of the present invention when a contact pin is advanced, and FIG. 12 is a time when the contact pin of the above embodiment is retracted. FIG. In these drawings, a rack rod 39 is hung on the lower surface of the presser cover 34, and the operating lever 36
A fan-shaped gear portion 36a having teeth that mesh with the rack rod 38 is provided at the tip of the. Also in this embodiment, the same operation as that of each of the above-mentioned embodiments is performed and the same effect is obtained.

[0028]

In the IC socket of the present invention having the above structure, the oxide film on the surface of the IC lead does not prevent good electrical contact. Further, the design and manufacture are easy, and the deviation between the design and the actual manufacture is small, so that a new product can be developed in a short period of time.

[Brief description of drawings]

FIG. 1 is a sectional view of a contact pin according to a first embodiment of the present invention in an advanced state.

FIG. 2 is a sectional view of the contact pin in the retracted state of the embodiment.

FIG. 3 is a sectional view of the second embodiment of the present invention when the contact pin is advanced.

FIG. 4 is a cross-sectional view of the contact pin of the embodiment when retracted.

FIG. 5 is a sectional view of the third embodiment of the present invention when the contact pin is advanced.

FIG. 6 is a cross-sectional view of the contact pin of the embodiment when retracted.

FIG. 7 is a cross-sectional view of the fourth embodiment of the present invention when the contact pin is advanced.

FIG. 8 is a sectional view of the contact pin of the embodiment when retracted.

FIG. 9 is a sectional view of the contact pin according to the fifth embodiment of the present invention when it is advanced.

FIG. 10 is a sectional view of the contact pin of the embodiment when retracted.

FIG. 11 is a sectional view of the sixth embodiment of the present invention when the contact pin is advanced.

FIG. 12 is a cross-sectional view of the contact pin of the embodiment when retracted.

FIG. 13 is an external view of a conventional IC socket.

FIG. 14 is a sectional view showing the movement of the contact drive unit.

FIG. 15 is a sectional view showing the movement of the contact drive unit.

FIG. 16 is a sectional view showing the movement of the contact drive unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base member 2 ... IC accommodation part 5 ... Contact pin 5a ... Contact part 5b ... Spring part 5c ... Followed part 5d ... Base 23 ... IC 25 ... IC lead 34 ... Presser cover 35 ... Spring 36 ... Actuating lever 37 ... Cam

Claims (1)

[Claims] 1. A base member having an accommodating portion of an IC package, a plurality of contact pins erected in the base member along at least two sides of the accommodating portion, and a retractable member with respect to a bottom surface of the base member. In a socket having a pressing cover to which a spring force is applied upward,
The contact pin has a base fixed to the base member, a spring portion connected to the base and having elasticity toward the accommodating portion, and a spring portion connected to the base via the spring portion for accommodating portion side. A driven portion having a contact portion at an end thereof, and a cam which is rotated about an axis parallel to the row of the contact pins and cooperates with the driven portion to control the movement of the contact portion with respect to the IC lead. The IC socket is characterized in that an operating lever for rotating the cam by pressing the pressing cover is attached to the cam.