JPS6322619B2 - - Google Patents

Description

[Detailed description of the invention] The present invention has a pad for external connection on one side.
Concerning sockets used for LSI connections.

As a type of LSI socket in which an LSI is pressed into contact with a contact, the one shown in FIG. 1 or 2 is known. Figure 1 shows the housing 1
The external connection pad 4 of the LSI 3 is connected to the contact 5 by the locking cover 2 that engages with the peripheral part of the LSI 3.
It is pressed into contact with the Further, in FIG. 2, one end of the cover 7 is fixed to the housing 1 using a hinge 6, and the other end is fixed to the housing 1 using a stopper 8.
is pushing towards. Note that 10 is a printed circuit board.

Since these conventional sockets have a structure in which the locking cover 2 and the stopper 8 are engaged with the periphery of the housing, there is a risk that the housing 1 may be distorted and sufficient contact force may not be obtained. This is the third point.
This will be explained using figures. In Fig. 3, contact force P generated between contact 5 and pad 4 of LSI 3
Based on this, the same force P is generated downward at the contact support portion of the housing 1, and a similar pulling force is also applied to the arm tip of the locking cover 2 via the LSI 3. As a result, assuming that the distance between the lines of action of both forces is L, a force couple of P x L is generated for each contact 5 on the housing 1, causing the housing 1 to warp or lift off from the printed circuit board 10. It happens. Due to these distortions, there was a risk that sufficient contact force could not be obtained between the LSI 3 and the contact 5 to obtain the stable contact that was designed.

Therefore, the object of the present invention is to
The purpose of the socket is to prevent the generation of force couples within the housing as much as possible.

Furthermore, another object of the present invention is to achieve the above object with a simple structure.

The present invention will be described below using examples with reference to the drawings.

4 to 6 show an embodiment of an LSI socket according to the present invention, and FIG. 7 is a cross-sectional view of the same embodiment with an LSI mounted thereon. This LSI socket includes a rectangular insulating housing 11 that receives an LSI 3 and has a large number of external connection pads arranged in a row around one side. A large number of conductive contacts 12 are installed and held in the housing 11 along each of its four sides. The contact 12 has a contact portion 13 that comes into elastic contact with an external connection button on the lower surface of the LSI 3 fitted into the housing 11, and extends through the housing 11 to the outside. This contact 12
The portion 14 that penetrates the housing 11 is positioned closer to the center of the housing 11 than the contact portion 13 is. The portion 15 of the contact 12 drawn out to the outside is passed through a through hole 16 of the printed circuit board 10, for example, and then soldered 17.

By the way, after the LSI 3 is fitted into the housing 11, the cover plate 18 is superimposed on it, and furthermore, the ring plate-shaped cam plate 19 is superposed on it. As is clear from FIG. 4, the cam plate 19 has four projecting portions 21 projecting outward in the radial direction, and these projecting portions 21 can be engaged with the claws 22 of the cover plate 18. The cover plate 18 is rotatably attached to the upper surface of the cover plate 18.

Furthermore, hook plates 23 are fitted and attached to each of the four sides of the housing 11. The fitting of the hook plate 23 is guided by a projection 24 on the side surface of the housing 11. After the hook plate 23 is fitted, the protrusion 24 is made larger in diameter by heating and crushing the tip thereof, thereby also serving to prevent the hook plate 23 from coming off.

The hook plate 23 has an engaging portion 27 that is inserted between the leg portions 25 at the four corners of the lower surface of the housing 11 and engages with an engaging groove 26 on the lower surface of the housing 11, and an upper surface of the protruding portion 21 of the cam plate 19. It integrally has a hook portion 28 that fits.

The hook plate 23 and the cam plate 19 are initially attached in the relationship shown in FIG. That is, the work plate 23 is located between the projecting portions 21 of the cam plate 19.
Insert the hook part 28. Thereafter, the cam plate 19 is rotated in the direction of the arrow 31 using, for example, a tool engaged with the hole 29, and at this time, the hook portion 28 is moved to the fourth position by the slope 32 at one end of the projecting portion 21. It is made to ride on the protruding portion 21 as shown in the figure. In other words, the projecting portion 21 is connected to the hook portion 2.
Insert it below 8. As a result, cam plate 1
9 and the hook plate 23, the housing 11 and the cover plate 18 are firmly clamped. That is, the cam plate 19 and the hook plate 23
This constitutes a locking device.

Furthermore, the engagement groove 26 on the lower surface of the housing 11 is formed at a position that includes the line of action of the support reaction force P of the contact 12 when the contact 12 contacts the LSI 3. At this time, since the portion 14 of the contact 12 is already positioned toward the center of the housing 11, it does not become an obstacle to the formation of the engagement groove 26.
The structure does not become complicated. When the engaging portion 27 of the hook plate 23 engages with the engaging groove 26 at such a position, the engagement point coincides with the line of action of the support reaction force P of the contact 12 or becomes close to the line of action. Therefore, generation of a force couple within the housing 11 is prevented. Here, it is desirable that the engagement point coincides with the line of action of the support reaction force, but some deviation is allowed.

Note that by fitting the hook plate 23 from the side without using the cam plate 19, the housing 11 and the cover plate 18 can be attached to the hook plate 23.
You may also insert it directly.

As described above using the embodiments, according to the present invention, it is possible to provide a pressing contact type LSI socket in which the generation of force couples within the housing is prevented as much as possible through a simple structure.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an example of a conventional LSI socket in use, Fig. 2 is a similar sectional view on the other side, and Fig. 3 is an explanatory diagram of the couple generation effect on the side shown in Fig. 1.
FIG. 4 is a top view of one embodiment of the LSI socket according to the present invention when locked, FIG. 5 is a side view, and FIG.
7 is a sectional view of only the essential parts of the embodiment in use, and FIG. 8 is a partially cutaway top view of the embodiment before locking. 3...LSI, 10...Printed circuit board, 11...
Housing, 12...Contact, 13...Contact portion, 18...Cover plate, 19...Cam plate, 23...Hook plate, 26...Engagement groove, 27
...Engagement part, 28...Hook part.

Claims (1)

[Claims] 1. A socket used for connecting an LSI having an external connection pad on one side, an insulating housing for receiving the LSI, a conductive pad built into the housing and in contact with the external connection pad of the LSI. The LSI includes a magnetic contact, a cover plate overlaid on the opposite surface of the LSI, and a locking device attached to the periphery so as to sandwich the housing and the cover plate, and the locking device and the housing are connected to each other. An LSI socket characterized in that a meeting point is set at a position that coincides with a line of action of a support reaction force of the contact when the contact contacts the LSI, or a position near the line of action. 2. In the LSI socket according to claim 1, the contact passes through the housing and is pulled out to the outside, and the portion of the contact that passes through the housing is connected to the external connection pad of the LSI. It is characterized by being positioned closer to the center of the housing than the contact point.