JPH0766853B2 - LSI socket open / close tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] The present invention relates to a socket used for detachably connecting a large-scale integrated circuit (hereinafter referred to as “LSI”) or the like to a printed circuit board. Regarding the opening / closing tool used when attaching / detaching the LSI to / from the LSI socket, the contact force is released by the locator without sliding on the contact.
By providing a small and easy-to-use opening and closing tool for the LSI socket that attaches and detaches the LSI, it is possible to increase the number of terminals and contact force of the LSI socket, and A pair of arms that are rotatably supported in a substantially X-shape and have a drive unit that presses the locator of the LSI socket at the lower end, and a pair of arms that are rotatably provided between the upper ends of the arms and that rotate through the screw section to mount the arms. The shaft member opens and closes, and the frame member that holds the drive unit slidably and is guided by the outer shape of the LSI socket.

[Industrial application field]

The present invention relates to a socket used when detachably connecting an LSI or the like to a printed circuit board, and particularly to an opening / closing tool used when attaching or detaching an LSI having a high terminal density and a large number of terminals to an LSI socket.

In recent years, high integration of LSI has advanced and C of large general-purpose computer
For PU gate circuits, etc., the number of signal pins for input and output is hundreds of terminals, and the pin interval is 50 MIL (1.27 mm) to 25 MIL.
The one that reaches up to (0.675mm) has come to be used. When testing or burn-in of such a multi-terminal, high-density LSI, it is carried out by mounting it in an LSI socket, but it is desirable to be able to easily connect and disconnect the multi-terminal without damaging the signal pins at the time of this attachment / detachment. .

[Conventional technology]

As a conventional LSI socket of this type, the contact pressure of a contact (contactor) having a contact portion that wraps the outer peripheral portion of the signal pin from the periphery and presses it in the diametrical direction is weakened, and each signal pin of the LSI is There is a low insertion / extraction force type socket in which a large number of sockets are implanted in the socket body and the LSI is inserted from above with a small insertion / extraction force.

However, in the case of a contact in which the signal pins are wrapped all around as described above, the outer diameter of the contact portion cannot be reduced so much that it is difficult to realize a high-density terminal arrangement.
In addition, since a certain amount of contact pressure is required to ensure good electrical connection, there is a limit to lowering the insertion / extraction force per contact.If the number of signal pins increases, the overall insertion / extraction force will increase and damage to the LSI will occur. It is difficult to insert and remove without giving.

Since this type of LSI usually has a large number of terminals, it uses a pin grid array (PGA) structure in which signal pins are arranged not only on the peripheral area of the LSI but also on a wide area on the bottom surface, especially when removing. If you pull it out by holding only the outer periphery of the LSI,
There was a problem that the ceramics that make up the SI body were damaged by bending stress.

Therefore, recently, an LSI socket in which an LSI can be attached / detached without inserting / removing force has been proposed.

As shown in the sectional view of the non-insertion-free LSI socket of FIG. 2, this is a base body 12 in which a plurality of contacts 11 are erected in a cantilever manner, and a contact hole into which the free end side of the contacts 11 is fitted. A pair of locators 13 is provided on the base body 12 slidably in a direction in which 13a is drilled, and
An LSI socket having a collar portion (14a) for guiding the outer shape of the LSI (2) and a cover (14) slidably holding the pair of locators (13).

The pressing portion 13b of the locator 13 protruding to the side surface of this socket
Is moved toward the center by pressing the pair of locators 13 in the direction of approaching each other as shown by the arrow P,
The free end side of the contact 11 fitted in the contact hole 13a is pushed by the contact hole 13a of the locator and displaced by half in the central direction, and is displaced from the normal position (state shown in the figure) to become like a dotted line. When the LSI2 is mounted in this state, the signal pin 21 of the LSI can be mounted without inserting the contact 11 without sliding, and when the pressure is released, the contact 11 returns to the normal position and contacts the signal pin, so that the LSI and socket An electrical connection with is achieved. Since the contacts are simple cantilevered and each signal pin is pressed from one side, the area occupied by each contact can be reduced and a high-density terminal arrangement can be achieved.

[Problems to be Solved by the Invention]

When attaching or detaching the LSI to or from the socket, it is necessary to apply a force to the pressing portion of the locator to move the pair of locators in the direction of approaching each other to separate the signal pin and the contact. In this case, if the contact spring force is increased by increasing the contact spring force and the number of terminals increases, the pressing force increases to several tens of kilograms or more, making it difficult to press and move the locator by hand. There is a problem that it is extremely troublesome to attach and detach the LSI while maintaining it. In addition, it is desirable that many sockets are arranged close to each other in a limited space, but there is a problem that there is a limit to the arrangement of the sockets because it is necessary to provide a space that can be accessed with a fingertip or the like outside the pressing portion. It was

The present invention has been made in view of the above circumstances, in which the contact force is released by pressing the locator and the LS is moved without contact with the contact.
By providing a small-sized and easy-to-use opening / closing tool for an LSI socket in which I is attached and detached, it is possible to increase the number of terminals of the LSI socket and increase the contact force.

[Means for Solving the Problems]

The purpose is to open and close the LSI socket by locating the contact in a direction perpendicular to the direction of inserting the LSI by means of a locator, and inserting and removing the LSI with no insertion / extraction force. A pair of arms that are rotatably supported and have a drive unit that presses the locator of the LSI socket at the lower end, a shaft member that is rotatably provided between the upper ends of the arms and that opens and closes the arms via a screw portion by rotation, The LSI socket opening / closing tool of the present invention is characterized in that it comprises a frame-shaped member that slidably holds a drive portion and is guided by the outer shape of the LSI socket.

[Action]

Since the shaft member is rotated and the arm is opened and closed by screwing the screw, a small manual torque can be converted into a large force, and a desired pressing force can be obtained for the locator. The open / close tool can stand on the socket by the frame-shaped member guided by the outer shape of the socket, and when the rotation of the shaft member is stopped, the locator can be maintained in the contact release state while pressing the locator. It is removable and easy to operate.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an LSI socket opening / closing tool according to the present invention.

In FIG. 1, reference numeral 1 is an LSI with no insertion force described in FIG.
Socket 2 is an LSI that can be attached to and detached from the LSI socket, and 3 is an LSI socket opening / closing tool of the present invention.

The LSI socket opening / closing tool 3 includes a pair of arms 31 which are pivotally supported by an intermediate hinge portion 31a and are substantially X-shaped.
A shaft member 32 penetrating between the upper ends of the arms, and the arm
A frame-shaped member 33 that slidably engages the drive portion 32b at the lower end of 31
Consists of.

On the upper end of the arm 31, a nut member 31c having a short cylindrical shape and having a female screw hole in the diameter direction is rotatably fitted. The left and right arms are reversely threaded in the female screw holes, and the shaft member 32 having the operation rod 32a in the center and the male screw portions corresponding to the nut member 31c on both sides is penetrated.

At the lower end of each arm 31, a drive portion 32b composed of a rod member 32d to which a circular pipe 31c is attached is fixed in a substantially inverted T shape.

Reference numeral 31e is a stopper that prevents the pair of driving portions 31b from approaching a predetermined distance or less and applying an excessive pressing force.

The four tips of the rod member 31d penetrate through the long holes 33a of the frame-shaped member 33 having an inner diameter into which the outer shape of the LSI socket 1 is fitted, are retained by the retaining ring 33c, and are held so as to be slidable in the horizontal direction. ing.

The operation of the LSI socket opening / closing tool having the above configuration is as follows.

When the frame-shaped member 33 is put on the LSI socket 1 from the upper side, the circular pipe 31c of the drive portion 31b of the arm is guided by the outer shape of the socket to the pressing portion 13b of the locator 13 protruding from the opposite side surfaces of the socket. Play with the LSI socket 2 so that they touch.

Then, when the operating rod 32a of the opening / closing tool is manually rotated in the direction of arrow A, the shaft member 32 is rotated and the threaded portion having a reverse screw relationship on the left and right pushes the upper end of the arm 13 in the direction of arrow B. In this case, since the nut member 31c is rotatably fitted to the arm 31, the arm can be expanded while keeping the pair of female screw portions coaxial.

As a result, the lower end of the arm 13 moves in the approaching direction, and the driving portions 31b extending on both sides of the lower end are provided with the elongated holes 33a of the frame-shaped member 33.
Guided by the arrow, it moves horizontally as indicated by arrow C, and pushes the pair of locators in the direction of approaching as indicated by arrow D. By moving the locator to the center, the upper ends of the plurality of contacts 11 are displaced toward the center by half of the upper ends of the plurality of contacts 11 as described above with reference to FIG. You can If the operating rod 32a is rotated in the opposite direction after being attached or removed, the drive portions 31b of the pair of arms are opened in directions away from each other by the opposite operation and the pressing of the locator is released, so that the contact returns to the normal position. Contacts the signal pin 21 of the LSI 2 in a predetermined manner.

As described above, since this opening / closing tool rotates the shaft member on the upper side of the LSI socket and presses the locator via the screw, it suffices to provide a space for the frame-shaped member play around the socket and to reduce the torque. It is possible to generate a large pressing force with a multi-terminal array of high density.
It becomes easy to attach and detach the LSI to the LSI socket.

〔The invention's effect〕

According to the present invention, it is possible to provide a small and easy-to-use opening / closing tool for an LSI socket in which the contact force is released by pressing the locator to attach / detach the LSI with no insertion / removal force.
It is possible to increase the number of LSI socket terminals and the contact force.

[Brief description of drawings]

FIG. 1 is a perspective view showing an LSI socket opening / closing tool according to the present invention, and FIG. 2 is an LSI with no insertion / extraction force to which the opening / closing tool of the present invention is applied.
It is a sectional view of a socket. In the figure, 1 ... LSI socket, 11 ... Contact, 13 ... Locator, 13a ... Locator pressing part, 2 ... LS
I, 21 ... LSI signal pin, 3 ... LSI opening / closing tool, 31 ... Arm, 31a ... Hinge part, 31b ... Drive part, 32 ... Shaft member, 32a ... Operation rod, 33 ... Frame It is a member.

Claims (1)

[Claims] 1. A tool for opening and closing an LSI socket (1) for displacing a contact (11) by a locator (13) in a direction perpendicular to an inserting direction of the LSI (2) and attaching and detaching the LSI (2) with no insertion / removal force ( 3) a pair of arms (31, 31) having a driving part (31b) for pivotally supporting the locator (13) at the lower end and pivotally supported in a substantially X-shape by an intermediate hinge part (31a). 31), a shaft member (32) that is rotatably provided between the upper ends of the arms (31, 31) and that opens and closes the arms (13, 13) via a screw portion by rotation, and the drive unit (31b) An LSI socket opening / closing tool, which comprises a frame-shaped member (33) that holds the slidably and is guided by the outer shape of the LSI socket (1).