JPH0734381B2 - IC socket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reciprocates an IC mounting plate superposed on a socket main body by rotating a cam shaft which is interposed between the superposed surfaces, so that the contacts of the socket main body and the leads of the IC are moved. The present invention relates to an IC socket that can be brought into and out of contact with another.

[0002]

2. Description of the Related Art As shown in FIG. 6, an IC 1 called PGA has a large number of leads 2 protruding from its lower surface, and is used to connect the IC 1 to a wiring board or the like.
In the socket, the IC mounting plate 4 is superposed on the upper surface of the socket main body 3 having contacts, and the cam shaft 5a is interposed between the IC mounting plate 4 and the one end superposed surface of the socket main body 3.
An operating lever 5b connected to one end of the camshaft 5a is attached to the side surface of the socket, and the operating lever is rotated in a standing or falling direction to rotate the camshaft in the forward or reverse direction. The IC mounting plate 4 is moved forward or backward along the upper surface of the socket main body 3 by forward or reverse rotation so that contact between the leads 2 of the IC 1 mounted on the IC mounting plate 4 and the contacts of the socket main body 3 is released or released. When the contact is released, the IC can be inserted / removed with no load so as to facilitate the insertion / removal work of the IC due to the increase in the number of poles, and prevent the minute lead deformation during the insertion / removal. I am collecting.

[0003]

However, since the socket has the structure in which the rotational movement of the camshaft is converted into the reciprocating movement of the IC mounting plate, the IC mounting plate can be easily pushed up during the rotation process of the camshaft. There is a problem that an upward warp occurs, which causes permanent deformation of the upward warp due to the repeated operation of the camshaft.If the above upward warp occurs, the lead is also pushed up and cannot be smoothly introduced into the contact, and it is pushed up once. The lead has a problem that it is difficult to insert it properly into the contact even if the IC mounting plate is restored. Similarly, if the IC mounting plate undergoes a permanent warp deformation, the lead and the contact can be properly handled. Further, there is a problem that the amount of pressing of the IC mounting plate by the cam shaft is reduced and it becomes difficult to secure the reciprocating stroke of the mounting plate.

[0004]

SUMMARY OF THE INVENTION The present invention effectively solves the above problems in the case of reciprocating the IC mounting plate by the rotation of the camshaft, by a simple means, and thus uses the camshaft. The advantage of the zero insertion type socket is fully exhibited, and as a means therefor, one end of the IC mounting plate is projected outward from an intervening portion of the cam shaft to form a pressure receiving plate portion, A pressing bar made of a round bar is arranged in contact with or close to the upper surface of the pressure receiving plate, and the pressing bar extends in parallel with the cam shaft at a position adjacent to the outside of the cam shaft, and Both ends are supported by the socket body.

[0005]

The warp of the moving plate is caused at one end of the moving plate in which the camshaft is interposed. This warp impairs the motion transmitting action of the camshaft and reduces the reciprocating stroke of the moving plate. The above-mentioned problems such as contact defects are caused.

Since the presser bar according to the present invention exerts a pressing force on the pressure receiving plate portion projecting outward of the cam shaft interposition portion at a position adjacent to the outer side of the cam shaft, the cam bar is eccentrically rotated. Along with this, the one end side of the moving plate tends to float up, and the effect of suppressing this at the rising occurrence portion is exerted, and a good effect of preventing warpage at the same place can be expected. Therefore, it is possible to properly solve the problem that it is difficult to properly perform the reciprocating movement of the moving plate due to the upward warp and properly operate the camshaft.

Further, the round bar can be brought into line contact with the pressure receiving plate portion to exert a good effect of preventing the warp, and the moving plate can be smoothly moved laterally. In addition, the installation of the presser bar does not increase the bulkiness of the socket.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Similar to the conventional example shown in FIG. 6, FIG. 1 shows a socket used for a PGA type IC. The IC 1 has a large number of round pin-shaped leads 2 projecting downward from its lower surface, and the socket is the same as above. It has a socket body 3 made of an insulating material, and an IC mounting plate 4 made of an insulating material superposed on the upper surface of the socket body 3.

The IC mounting plate 4 has a large number of lead insertion holes 4a corresponding to the leads 2, and the socket body 3 has a large number of contacts 6 corresponding to the leads 2 immediately below the lead insertion holes 4a. Possessed, as shown in FIG.
The lead 2 of the IC 1 mounted on the C mounting plate 4 is inserted into the lead insertion hole 4a, and the tip of the lead protruding from the lower surface of the IC mounting plate 4 is brought into contact with the contact 6.

That is, the IC mounting plate 4 is reciprocally superposed along the upper surface of the socket body 3 as shown in FIG.
As shown in FIG. 3, at the position where the IC mounting plate 4 laterally moves in one direction, the tip of the lead 2 is inserted into the contact release position adjacent to the contact 6 to allow unloaded insertion / removal, and as shown in FIG. At the position where the mounting plate 4 laterally moves in the other direction, the lead 2 is moved to the contact position with the contact 6 together with the IC 1.

As a means for reciprocating the IC mounting plate 4, a cam shaft 5a is interposed between the socket main body 3 and one end overlapping surface of the IC mounting plate 4. The camshaft 5a
Has an eccentric shaft portion 5c at the center as shown in FIG. 4, or has a protrusion 5c 'on one side of the camshaft as shown in FIG. 5, and the protrusion 5c' and the eccentric shaft portion 5c IC mounting board 4
Forming a pressing portion of.

Further, an operating lever portion 5b which can be bent in a ‘3’ shape is continuously provided from one end of each cam shaft 5a.
a shows the socket body 3 and the IC as shown in FIGS.
It is interposed between the overlapping surfaces of the mounting plate 4 at one end, and is horizontally provided over the entire width in the direction orthogonal to the reciprocating direction of the IC mounting plate 4.
The operation lever portion 5b is brought along one side surface of the socket, and is rotated to a lying position along the side surface of the socket, whereby the IC mounting plate 4 is laterally moved in one direction to make contact with the lead 2 shown in FIG. 3B. The contact state of No. 6 is formed, and the contact release state is formed by rotating the contact state to the standing position shown in FIG. 3A.

As shown in FIGS. 3A and 3B, the eccentric shaft portion 5c and the projection portion 5c 'of the camshaft 5a are slidably fitted into a groove 4d provided on one end of the IC mounting plate 4, and the groove 4d.
While contacting the inner surface of d, the cam shaft 5a is rotated around the axis of the cam shaft 5a to give a moving force to the IC mounting plate 4. At the time of this rotation movement, the eccentric shaft portion 5c has a rotation axis trace. A push-up force is applied to one end of the IC mounting plate 4 near the top dead center, and the push-up force causes a warp at the same end.

As shown in FIGS. 1 to 3, a holding bar 7 made of a round bar is used as a means for preventing the camshaft 5a from being warped.

As shown in FIGS. 1 and 3, one end of the IC mounting plate 4 is projected outward from an intervening portion of the cam shaft 5a to form a pressure receiving plate portion 4b, and the pressure receiving plate portion 4b is formed.
A pressing bar 7 made of a round bar is arranged in contact with or close to the upper surface of the cam bar, and the pressing bar 7 extends in parallel with the cam shaft 5a at a position adjacent to the outer side of the cam shaft 5a, and Connect both ends of the bar 7 to the socket body 3
It is supported by a bearing 3a integrally formed with the bearing 3a and contacts the upper surface of the entire mounting plate between the bearings 3a to suppress warpage.

The holding bar 7 is formed of a round bar as described above, and comes into line contact with the upper surface of the pressure receiving plate portion 4b which is projected to one end side of the IC mounting plate 4 on the bus bar of the round bar. The pressure receiving plate portion 4b is arranged such that its upper surface is lower than the top dead center of the cam shaft 5a, and a horizontal sliding surface 4c is formed on the upper surface of the pressure receiving plate portion 4b. The cam shaft 5a is horizontally provided in contact with the IC mounting plate 4. The IC mounting plate 4 is smoothly reciprocated while making linear contact with the pressing bar 7 on the sliding surface 4c.

Both ends of the holding bar 7 are rotatably attached to the bearing 3a or non-rotatably attached. By forming the presser bar 7 with a round bar and rotatably attached, the presser bar 7 rotates together when the IC mounting plate 4 reciprocates, and the reciprocating motion can be performed smoothly.

Although not shown, the presser bar 7 may be installed side by side in contact with the upper surface of the IC mounting plate 4 at one end, and may also be installed in a close state slightly spaced from the upper surface of the same end. This adjacent lateral structure allows the camshaft to push up in a limited range, and prevents further harmful pushup.

[0019]

As described above, the IC is formed on the upper surface of the socket body.
In a socket of the type in which the mounting plate is overlapped and the cam shaft is interposed between the overlapping surfaces and the IC mounting plate is reciprocally moved by the rotation operation of the cam shaft to make contact and release, the rotation of the cam shaft At the same time, there is a problem that one end of the IC mounting plate on the moving side (the end on the side where the cam shaft is interposed) is pushed up to cause an upward warp at the end, which causes contact defects.

The presser bar according to the present invention exerts a pressing force on the pressure receiving plate portion projecting outward of the cam shaft intervening portion at a position adjacent to the outer side of the cam shaft, so that the eccentric rotation of the cam shaft is performed. As a result, one end side of the moving plate tends to float up, and an effective deterrent effect is exerted at the location where the uplift occurs, and a good effect of preventing warpage at that location can be expected. Therefore, it is possible to properly eliminate the problems such as the difficulty of the reciprocating movement of the movable plate due to the warp and the occurrence of the contact defect, and to properly operate the camshaft. In addition, the installation of the presser bar does not increase the bulkiness of the socket.

Further, since the round bar is used as the above-mentioned pressing bar,
The upper surface of the pressure receiving plate can be brought into line contact with the bus bar to exhibit a good upward warp prevention effect, and at the same time, the moving plate can be smoothly moved laterally with low resistance.

Further, the present invention has an advantage that the intended purpose can be achieved with a simple structure in which only a presser bar is added, and the addition of the presser bar does not increase the bulkiness of the socket.

[Brief description of drawings]

FIG. 1 is an IC showing a press bar according to an embodiment of the present invention.
It is a perspective view of a socket.

FIG. 2 is a cross-sectional view of a holding bar portion in the socket.

FIG. 3A is a vertical sectional view of a holding bar portion in the socket, showing a contact state.

FIG. 3B is a vertical sectional view showing the contact release state.

FIG. 4 is a plan view illustrating a camshaft.

FIG. 5 is a plan view showing another example of the camshaft.

FIG. 6 is a perspective view showing a conventional IC socket.

[Explanation of symbols]

 1 IC 2 Lead 3 Socket body 3b Presser claw 4 IC mounting plate 5a Camshaft 6 Contact 7 Presser bar

Claims (2)

[Claims] 1. An IC mounting plate 4 is superposed on an upper surface of a socket main body 3 having a contact 6, and a cam shaft 5a is interposed between the superposed surfaces of the socket main body 3 and the IC mounting plate 4 at one end.
The IC mounting plate 4 by rotating the camshaft 5a.
IC1 mounted on the IC mounting plate 4 by forward and backward movement of
In the IC socket configured to contact and release the contact between the lead 2 and the contact 6, one end of the IC mounting plate 4 is projected outward from the intervening portion of the cam shaft 5a and the pressure receiving plate portion 4b. And a pressing bar 7 made of a round bar is arranged in contact with or close to the upper surface of the pressure receiving plate portion 4b.
The holding bar 7 extends in parallel with the cam shaft 5a at a position adjacent to the outside of the cam shaft 5a, and both ends of the holding bar 7 are supported by the socket body 3. IC socket. 2. The IC socket according to claim 1, wherein the holding bar 7 is rotatably provided.