JP2555612B2 - LSI socket - 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 an LSI socket that can be easily connected to an LSI, L that has a signal pin arrangement of PGA (Pin Grid Array) configuration
For the purpose of providing an LSI socket that can be connected simply by pressing SI, a base member having a plurality of steps that rise from the central part to the outer peripheral part, and a spacer member that fits in each step of the steps An L-shaped contact consisting of a contact portion at the upper end, a lever portion at the lower side, a substantially rod-shaped contact having a retaining portion in the middle, a horizontal spring portion for mounting the contact at the tip, and a terminal portion. At least a spring member having a shape, a cover member and a guide member for movably guiding the contact, and a fastening unit rotatably held by the cover member, and between the base member and the cover member, The spring members are sequentially laminated, the horizontal spring portion of the spring member is sandwiched by the spacer member, and the retaining portion of the contact is displaced between the guide member and the cover member. It is sandwiched as much as possible.

[Industrial applications]

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 LSI socket having a high terminal density and capable of easily connecting a large number of LSIs.

In recent years, high integration of LSIs has progressed, and for large-scale general-purpose computer CPU gate circuits, etc., the number of signal pins for input and output is several hundred, and the pin interval is 50 MIL (1.27 mm) to 25 M.
Those that reach IL (0.675 mm) have come to be used. There is a strong demand for an LSI socket capable of easily connecting and disconnecting multiple terminals without damaging signal pins during testing or burn-in of such multiple terminals and high-density LSI.

[Conventional technology]

In this type of conventional LSI socket, the contact pressure of the contact (contactor) having the contact portion that presses the outer peripheral portion of the signal pin in the diameter direction is weakened, and a large number of LSIs are implanted in the socket body. There is a low insertion / removal type socket that inserts and removes the signal pin from each pin so that the LSI can be inserted from above.

[Problems to be solved by the invention]

In the above-mentioned conventional LSI socket, since the contact pressure generated by bending the spring in the direction perpendicular to the axis of the contact is generated, the area occupied by the cross section of the contact cannot be reduced so much, and thus a high-density terminal arrangement can be realized. It was difficult.

In addition, in order to form a good electrical connection, it is necessary to maintain a certain level of contact pressure or more, so there is a limit to the low insertion / extraction force per contact, and when the number of signal pins reaches several hundreds, insertion / extraction is performed. The force reaches nearly 100 kg, and it is difficult to insert and remove without damaging the LSI. Since the number of terminals is large, the pin grid array (PGA) structure in which the signal pins are arranged in a wide area on the lower surface of the LSI is adopted not only on the outer periphery of the LSI, but especially on the outer periphery of the LSI main body when removing. When pulling out only the part, there was a problem that the ceramic etc. that compose the LSI body was damaged by bending stress.

[Means for solving problems]

The above-mentioned problems include a base member having a step increasing from the central portion toward the outer peripheral portion and a terminal hole formed on the step surface, and an outer shape and a thickness for fitting with the outer wall of each step of the step. A spacer member having a spring guide groove having a through hole at the outer peripheral end is formed on the upper surface, the number of spacers is equal to the number of steps of the step, the contact portion is at the upper end, the lever portion is at the lower side, and the contact is at the middle. Portion and a retaining portion having a diameter larger than that of the lever portion, a substantially rod-shaped contact, a horizontal spring portion on which the contact is placed at the tip and guided by the spring guide groove, the through hole and the terminal An L-shaped spring member consisting of the horizontal spring portion and a terminal portion perpendicular to the horizontal member that extends through the hole to the lower surface of the base member; a concave portion for positioning the LSI on the upper surface; and a contact portion of the contact. Contact A cover member in which a hole is formed, a step-like guide member in which a guide hole for loosely engaging the lever portion of the contact is formed at a position corresponding to the contactor hole of the cover member, and the cover member is rotatable. Fastening means for holding the upper surface of the LSI against the concave portion, and a spacer member corresponding to each step of the base member between the base member and the cover member. The spring member is sequentially laminated, the horizontal spring portion of the spring member is sandwiched by the spacer member, and the retaining portion of the contact is narrowed by the guide member and the cover member so as to be vertically displaceable. It is solved by the socket for LSI of the present invention characterized by being held.

[Operation] Use the horizontal spring portion of the spring member as a cantilever spring for generating contact pressure, and the contact placed at the tip of the horizontal spring portion should only function as a lever for transmitting deflection. As a result, it is not necessary to provide the contact portion with a spring mechanism for generating contact pressure. Therefore, the cross-sectional area per contact right under the LSI can be reduced, and a high-density contact arrangement can be achieved.

When mounting the LSI, position the LSI in the recess and place it, and then press the upper surface with the lever to displace the LSI downward, and the contact that is in contact with the tip of the signal pin will be vertically downward. The horizontal spring portion that constitutes the cantilever spring is deflected, a contact pressure is generated, and a good electrical connection is formed between the signal pin and the contact.

Since the lever is held in the pressed state, the electrical connection is maintained.

At the time of removal, it is only necessary to release the pressing by the lever, and no withdrawal force is required.

〔Example〕

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

1 is a partially cutaway side view of an LSI socket according to the present invention, and FIG. 2 is an enlarged view of a C portion in FIG.

 First, the overall structure will be described with reference to FIG.

As shown in the figure, this LSI socket has seven main elements,
That is, the base member 1, the plurality of spacer members 2 having similar outer shapes and slightly different sizes, the plurality of contacts 31 having different lengths (indicated by solid lines in the drawing), and the spring member 32 in contact with the lower ends of the contacts 31. (Also indicated by a solid line),
Cover member 4, guide member 8 for guiding the contact,
For example, it is composed of a fastening means composed of two levers A6 and B7.

Reference numeral 5 is an LSI to be mounted, and a large number of signal pins 51 are provided on the lower surface in a high density grid.

The fastening means is a positioning recess 41 at the center of the cover member 4.
After mounting the LSI5 on the LSI, the lever A6 pivotally supported on the cover member 4 is rotated in the direction of arrow A to bring the pressing surface 61 into contact with the upper surface of the LSI5, and then the lever B7 similarly pivotally supported. When it is rotated in the B direction, the fastening claw 71 moves to the lever A6.
The LSI 5 is configured to be engaged with the claw receiver 62 and to be pressed and held by the bottom surface of the recess 41 of the cover member 4.

Next, other elements will be described in detail with reference to FIG.

The base member 1 has a quadrangular outer shape, and has a plurality of stepwise steps 11 that increase from the central portion toward the outer peripheral portion, and terminal holes 12 that penetrate downward at each step of the step 11 (in the direction perpendicular to the paper surface). A plurality of them are arranged side by side).

The spacer member 2 has a substantially frame-shaped outer shape having the same outer circumference as the wall surface around each step described above and an opening in the center, and a thickness equal to the height of the step, and is fitted to each step. Is formed in. A plurality of guide grooves 21 for accommodating the horizontal spring portions 32a of the spring members 32 are formed on the upper surface of each spacer member 2 at a predetermined pitch (arranged in the vertical direction in the drawing). A contact hole 22 through which the terminal portion 32b of the spring member 32 penetrates is formed at the outer peripheral side end portion (right side in the figure).

The contact 31 has a contact portion 31a that abuts against the tip of the signal pin 51 of the LSI 5 on the upper end surface, a lever portion 31b on the lower side, and a contact portion 31a in the middle that is flush with the bottom surface of the recess 41 of the cover member 4. It is a substantially rod-shaped metallic member having a positioning portion 31c having a diameter larger than that of the contact hole 41 for positioning and preventing the cover member from falling off.

The spring member 32 is made of a spring material, and is a horizontal cantilever spring having a predetermined length protruding from the end face 23 of the opening of the spacer member and mounting and contacting the contact 31 at the tip, and the other portion is the spacer member. The horizontal spring portion 32a housed in the guide groove 21 and fixedly held by the bottom surface of the next spacer member laminated immediately above, and the lower end protruding to the lower surface of the terminal hole 11 of the base member and soldered to a printed circuit board or the like. The two portions with the terminal portion 32b connected with are formed in an L shape.

The cover member 4 has a contact hole 42 for accurately disposing the contact 31 at a position corresponding to the high-density signal pin 51 of the LSI. It is possible to arrange them in parallel and it is easy to achieve a pitch interval of 25 MIL (0.675 mm).

The guide member 8 engages the lever portion 31b to contact the contact 3
Guide holes 81 for vertically moving 1 are stepwise members formed in the same arrangement as the contactor holes 42 of the cover member 4.

Then, when the LSI 5 is mounted and pressed by the fastening means, the contact 31 is displaced downward and the tip of the spring member 32 is bent, so that a desired contact pressure is generated.

In this case, the plurality of spring members are configured such that the lengths of the horizontal cantilever springs thereof are all equal, so that a good electrical connection with a small contact pressure variation is formed for all the signal pins. To be done.

Further, in order to remove the LSI, it suffices to release the fastening means by a simple lever operation, and it does not require a large withdrawal force as in the conventional socket, so that the LSI is not damaged.

The contact retaining portion 31c can easily preliminarily apply a preload to the contact force by preliminarily bending the horizontal spring portion 32a before mounting the LSI.

Further, according to this configuration, the horizontal spring portion 32a of the spring member is
Since the lead-out position of the terminal part 32b can be changed arbitrarily by changing the length of, the printed board for mounting this socket does not require the high terminal density of LSI, Is enough.

〔The invention's effect〕

According to the present invention, it is possible to easily attach / detach an LSI having a high-density, multi-terminal planar signal pin array, which has a high connection reliability.
It becomes possible to provide SI sockets, and it is remarkable that they contribute to the high performance change of computers.

[Brief description of drawings]

 FIG. 1 is a partially cutaway side view of an LSI socket according to the present invention, and FIG. 2 is an enlarged view of portion C in FIG. In the figure, 1 ... Base member, 11 ... Step, 12 ... Terminal hole, 2 ... Spacer member, 21 ... Spring guide groove, 22 ... Through hole, 23 ... Opening end face, 31 ... Contact , 31a ... Contact part, 31b ... Lever part, 31c. 42 ... Contact hole, 5 ... LSI, 51 ... Signal pin, 6 ... Lever A, 61 ... Pressing surface, 62 ... Claw receiver, 7 ... Lever B, 71 ... Fastening claw, 8 ... ... guide member, 81 ... guide hole.

Claims (1)

(57) [Claims] 1. A base member (1) having a step (11) increasing from a central portion toward an outer peripheral portion and a terminal hole (12) formed on a surface of the step (11); A spacer having an outer shape and a thickness that fits the outer wall of each step, and a spring guide groove (21) having a through hole (22) at the outer peripheral side end portion is formed on the upper surface, and the number of spacers is equal to the number of steps of the step. A member (2), a contact part (31a) on the upper end, a lever part (31b) on the lower side, and a retaining part (31c) having a diameter larger than the contact part (31a) and the lever part (31b) in the middle. A substantially rod-shaped contact (31) in which is formed, a horizontal spring portion (32a) on which the contact (31) is mounted at its tip and guided by the spring guide groove (21), and the through hole (22). The horizontal spring portion (32) that extends through the terminal hole (12) and the terminal hole (12) and is led out to the lower surface of the base member (1).
a) L-shaped spring member (32) consisting of a terminal section (32b) perpendicular to a), a recess (41) for positioning the LSI on the upper surface, and a contactor for loosely contacting the contact section (31a) of the contact. A cover member (4) having a hole (42) formed therein, and a guide hole (8) for loosely engaging the lever portion (31b) of the contact at a position corresponding to the contactor hole (42) of the cover member.
1) A stepwise guide member (8) and a fastening means (6, 7) rotatably held by the cover member (4) to press and hold the upper surface of the LSI against the recess (41). ), And at least the spacer member (2) and the spring member (32) corresponding to each step of the base member (1) between the base member (1) and the cover member (4). ) Are sequentially stacked, the horizontal spring portion (32a) of the spring member is sandwiched by the spacer member (2), and the contact retaining portion (31c) is vertically displaceable so that the guide member has the retaining portion (31c). An LSI socket, which is sandwiched between (8) and the cover member (4).