JP4388610B2 - Conductive contact - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conductive contact used for inspection of semiconductor products and sockets.
[0002]
[Prior art]
Conventionally, for conducting electrical inspection (open / short test, environmental test, burn-in test, etc.) of conductor patterns and electronic parts on printed wiring boards, or for contact probes for wafer tests, etc., and semiconductor elements (LGA / BGA / Conductive contacts of various structures are used for sockets (including products) for CSP / bare chips) and connectors.
[0003]
For example, as a semiconductor element socket, a pair of conductive needles that can be projected and retracted in opposite directions are provided, and a compression coil spring is interposed between the two conductive needles. There is a device in which each protruding end of the body is elastically hit against a corresponding contacted body (such as a terminal) to transmit an electric signal between the contacted bodies.
[0004]
[Problems to be solved by the invention]
In recent years, the signal frequency used in semiconductor elements has been increased, and several hundreds of MHz have been used. In a socket used for a semiconductor element that operates at such a high speed, a conductive portion thereof is used. There is a demand for a certain conductive contact to further promote a reduction in inductance and a reduction in resistance. Further, in the socket for a semiconductor element as described above, in addition to the low inductance and low resistance, a relatively large stroke of the contactor, a thin socket as a whole, and mass productivity are required. The
[0005]
[Means for Solving the Problems]
In order to solve such a problem and improve the reduction in inductance and resistance, as well as securing a large stroke and shortening the holder length, the present invention is mutually contradictory. A pair of conductive needles that are supported by a holder so as to be able to move in and out in a direction and have a protruding end and an immersion side portion that are brought into contact with the contacted body in the moving and moving operation, and the pair of conductive needles so as to protrude in elastically in opposite directions from the holder, and a compression coil spring received in the coil spring support hole provided in the holder, said two conductive needles body, wherein extend in the axial direction of the coil spring support holes so that by facing each other disposed vital each retracted portion between so as to be point-symmetric with respect to the center of the coil spring support hole, wherein both conductive needle To always sliding contact with one another when the retractable movement by strike against each other's said respective retracted portion between the body by the compression coil inner spring, the holder, each of the two conductive needle members A pair of needle-like body support holes for reciprocally supporting the intermediate portion in a point-symmetric position with respect to the center of the coil spring support hole in the axial direction of the coil spring support hole are provided, Each intermediate portion is elastically biased by the compression coil spring, and each of the elastic biasing positions is set to a substantially point-symmetrical position with respect to the center of the coil spring support hole, and the central axis of the coil spring support hole is contain and wherein on each immersion portion surface along the direction in which the strike between the then position the respective retracted portion to the axis of the coil spring support hole, the distance from the axis to the respective protruding end , Distance from each axis to each bullet energizing position Also larger Ri, further wherein said projection engageable with each other against the spring with onset force of the compression coil spring is formed in the respective retracted end portions of the two conductive needle members, the engagement Both the conductive needles may be prevented from coming off in the protruding direction, and the conductive needles may be formed by pressing a plate material.
[0006]
By doing in this way, since a compression coil spring does not intervene in a signal transmission path, and it can advance linearly between both conductive needle-like bodies, low inductance and low resistance can be achieved. In addition, since the immersive end portions of both conductive needles are provided so as to be in sliding contact with each other in the holder, the respective strokes do not interfere with each other. As the total stroke of the child increases, the thickness of the entire socket can be reduced with respect to the stroke. Also, the conductive needles are not arranged coaxially, but are arranged so as to be point-symmetric with each other and overlap each other, and the conductive needles are made conductive by the load in the immersion direction applied to the conductive needles. By generating a moment in the direction in which the immersive end of the needle-shaped body strikes the other end in the radial direction in the compression coil spring, the conductive needle-shaped bodies can be suitably brought into sliding contact with each other. In addition, the conductive needle-like body can be formed into a plate shape, and mass production can be improved by pressing the plate material.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail based on specific examples shown in the accompanying drawings.
[0008]
FIG. 1 is an enlarged side cross-sectional view of a main part of a socket for a semiconductor element to which the present invention is applied, and FIG. 2 is a main part arrow view taken along line II in FIG. The socket 1 is interposed between the two (2, 3) when, for example, a BGA 2 as a semiconductor element is coupled to the substrate 3, and as shown in the drawing, two sockets are used as insulating support members. The insulating plates 4 are bonded together and integrated, and the integrated insulating plates 4 are provided with through holes penetrating in the thickness direction to form the holder in the present invention.
[0009]
The holder in the present embodiment is a coil spring support hole 5 having a circular cross section provided in the middle portion in the thickness direction of both insulating plates 4, and point symmetric about the axis center with respect to the coil spring support hole 5. It consists of a pair of needle-like body support holes 6 of rectangular cross-sections that are open at positions and open at opposite outer surfaces of both insulating plates 4. A compression coil spring 7 having a slightly smaller diameter than the inner diameter is received coaxially in the coil spring support hole 5.
[0010]
In the upper and lower needle-like body support holes 6 in the figure, intermediate portions of both conductive needle-like bodies 8 having the same shape are supported so as to be reciprocable in the axial direction. The conductive needle-like body 8 may be formed by punching a plate material into a substantially T shape by press / header processing, corresponds to a T-shaped vertical bar, and a leg portion 8a as an immersive side portion; The head 8b is formed in a vertically long shape corresponding to a horizontal bar. According to the above processing, for example, as shown in FIG. 3, a plurality of conductive needles 8 may be manufactured in a state of being connected in parallel, and then individually divided.
[0011]
Both the conductive needle-like bodies 8 are arranged so as to extend in the axial direction of the coil spring support hole 5 and to be symmetrical with respect to the center of the coil spring support hole 5. The head 8b of the conductive needle-like body 8 is supported by the needle-like body support hole 6 so as to be slightly tiltable and reciprocally movable in the retracting direction (vertical direction in the figure). A compression coil spring 7 is interposed between the stepped portions 8c serving as boundaries between the leg portions 8a and the head portions 8b in a compressed state by a predetermined amount in a natural state at the time of assembly. In the compression coil spring 7, the leg portions 8 a are received so as to face each other, and at the end portion in the immersing direction of the leg portion 8 a, an immersion side end portion that protrudes toward the opposing leg portion 8 a. An engaging portion 8d is formed.
[0012]
Furthermore, the center portion in the width direction of the head portion 8b is formed so as to be deviated by a predetermined amount in the thickness direction of the head portion 8b (see FIG. 1), and the contacted object is formed on the protruding end portion of the displaced center portion. A tapered needle tip portion 8e for hitting the needle is formed. The deflection direction of the needle tip portion 8e is radially outward of the coil spring support hole 5 with respect to the step portion 8c, and the protruding direction of the engagement portion 8d is the axis of the coil spring support hole 5 with respect to the step portion 8c. It is close to heart.
[0013]
In the assembled state of the conductive needle 8, as shown in FIGS. 1 and 4, the engaging portion 8 d is positioned at the axial center of the coil spring support hole 5, and the shaft of the coil spring support hole 5. The distance b from the center of the coil spring support hole 5 to the needle tip 8e is larger than the distance a from the center to the step 8c. Therefore, both the conductive needles 8 are inserted into the compression coil spring 7 so as to face each other, and the engaging portions 8d are engaged with each other, whereby the engaging portions 8d are supported by the stepped portions 8c. A moment is applied in a direction to face the opposing engaging portion 8d. Therefore, the engagement state between the two engaging portions 8 d is held by the elastic urging force of the compression coil spring 7.
[0014]
In addition, before assembling in the board | substrate 3, both the electroconductive needle-like bodies 8 may be assembled | attached to the compression coil spring 7, and it compresses similarly to the above by engaging both engaging parts 8d mutually in the state. The engaged state is maintained by the elastic biasing force of the coil spring 7. In this state, as shown in FIG. 5, both the conductive needles 8 and the compression coil spring 7 can be integrated. By assembling both insulating plates 4 so that the two conductive needles 8 in the integrated state are sandwiched between them in the axial direction, the assembled state of FIG. Will improve.
[0015]
For example, as shown in FIG. 6, when the needle tip portion 8 e is brought into contact with the contacted body with the load F, the both conductive needle-like bodies 8 receive the elastic urging force of the compression coil spring 7. A moment with each stepped portion 8c as a fulcrum S is generated, and thereby each engaging portion 8d is brought into contact with the leg portions 8a facing each other with a contact pressure R. The two conductive needles 8 are brought into an electrically conductive state through the contact points of the engaging portions 8d.
[0016]
Even more to the position relationship between the probe tip portion 8e and the stepped portion 8c described above (see FIG. 4), as shown in FIG. 7, the contact so as to bury Ryohari destination unit 8e in the insulating plate 4 When the body is brought into contact with the terminal 2a of the BGA 2 or the wiring pattern 3a of the substrate 3, the compression coil spring 7 is greatly compressed. The contact pressure between 8d is further increased.
[0017]
Therefore, in the entire stroke of the conductive needle-like body 8 from the natural state at the time of assembly to the elastic contact state with respect to the contacted body, the both engaging portions 8d are always in sliding contact with each other with contact pressure. In this manner, the needle-like body sliding contact holding means is configured by the positional relationship between the fulcrum S, the load F, and the contact pressure R with respect to the conductive needle-like body 8.
[0018]
And since the path | route of the electrical signal which passes between both the electroconductive needle-like bodies 8 passes only both the electroconductive needle-like bodies 8 as shown by the arrow A of FIG. 7, a part of compression coil spring is made into a conduction path. There is no waste of the route in what is done, and it becomes almost linear. As a result, there is no need for any restricting means or urging means for sliding the engaging portions 8d against each other, and the number of parts is not increased, and the low inductance and low resistance are greatly improved with a simple configuration. The transmission signal can be further increased in frequency.
[0019]
Further, since it is not necessary to use the compression coil spring 7 for signal transmission, the compression coil spring 7 has a specification of a simple equi-pitch coil spring having a short cutting length suitable for the highest speed and mass production. Can be applied. Therefore, mass production and cost reduction can be improved.
[0020]
In the needle-like body sliding contact holding means according to the present invention, the direction in which the both engaging needles 8 abut each other against the other engaging portion 8d so that the both engaging portions 8d are always in sliding contact with each other. Any device capable of generating a moment may be used, for example, as shown in FIG. In FIG. 8, the same parts as in the illustrated example are given the same reference numerals and detailed description thereof is omitted, but the tip of the needle tip 8e is inclined to the terminal 2a obliquely with respect to the protruding and retracting direction. It comes to contact. That is, both are arranged so that the center of the terminal 2a is in contact with the tip of the needle tip 8e while being shifted laterally, and the inclined surface 8f of the needle tip 8e is at the center of the terminal 2a. It comes to face diagonally.
[0021]
Therefore, when the terminal 2a and the needle tip portion 8e are brought into contact with each other as shown in FIG. 8, the immersion direction load F with respect to the conductive needle-like body 8 is shown in the drawing with respect to the needle tip portion 8e. Join diagonally. As a result, the needle tip portion 8e is positively displaced outward with respect to the fulcrum (S) of the step portion 8c, so that the moment M shown in the diagram around the fulcrum (S) of the step portion 8c acts. The joint portion 8d is always in sliding contact with the other party with a more reliable contact pressure.
[0022]
By the way, the conductive acicular body 8 in the present embodiment can be formed by punching from a plate material, and has high mass productivity. Further, the process of biasing the center part of the head part 8b and the taper process of the needle point part 8e can be simultaneously performed by the press process at the time of punching, which can further increase the mass productivity and reduce the manufacturing cost. .
[0023]
Further, since the leg portions 8a of the both conductive needles 8 are provided so as not to interfere with each other in the compression coil spring 7, the displacement amount of both is increased compared to the case where both are arranged coaxially. be able to. Therefore, when each protrusion amount from the holder is set, the length of the coil spring support hole is required to be the minimum of the sum of the protrusion amounts of both conductive needles in the case of coaxially arranged ones. On the other hand, according to the present invention, the length of the coil spring support hole 5 can be made so as to be able to absorb one protruding amount of the conductive needle-like body 8, and the length of the entire conductive contact can be reduced. It can be as short as possible.
[0024]
When used in a socket as in the present embodiment, the thickness can be improved, so that the space efficiency in the device to which the socket is applied can be improved, and the compression coil spring 7 is a double conductive needle-like body. Since the two engaging portions 8d are engaged with each other and held in a compressed state between the two step portions 8c, the coil length of the compression coil spring 7 in this state is slightly shorter than the depth of the coil spring support hole 5. By setting to, the elastic urging force of the compression coil spring 7 is not transmitted to the insulating plate 4, so that the insulating plate 4 is not warped even if the insulating plate 4 is made as thin as possible. Therefore, when the insulating plate 4 is fixed to the apparatus, for example, when it is screwed, the number can be reduced.
[0025]
【The invention's effect】
Thus, according to the present invention, since a signal can be transmitted linearly between both conductive needles without using a compression coil spring, low inductance and low resistance can be achieved. It can be applied to further transmission of high frequency signals, and since each immersive side portion of both conductive needles is provided in sliding contact with each other in the holder, the respective strokes interfere with each other. Therefore, since the entire stroke by both conductive contacts is increased, the thickness of the entire socket can be reduced. In addition, both conductive needles are not arranged coaxially, but are arranged so as to be point-symmetric with each other and overlap each other, so that the conductive needles are formed by pressing from a plate material. By doing so, since mass production can be improved, cost reduction of the conductive contact can be improved.
[Brief description of the drawings]
FIG. 1 is an enlarged side sectional view of a main part of a socket for a semiconductor element to which the present invention is applied.
FIG. 2 is an arrow view of a main part as viewed from the line II of FIG.
FIG. 3 is a diagram showing a processing procedure of a conductive contact.
4 is a top view seen from the arrow IV-IV line in FIG. 1. FIG.
FIG. 5 is a perspective view showing an example of a procedure for assembling conductive contacts.
FIG. 6 is an explanatory view showing a contact state of both conductive needles according to the present invention.
FIG. 7 is an explanatory diagram showing a conduction path of an electric signal.
FIG. 8 is a view corresponding to FIG. 7 showing another embodiment according to the present invention.
[Explanation of symbols]
1 Socket 2 BGA
3 Substrate 4 Insulating plate 5 Coil spring support hole 6 Needle-like body support hole 7 Compression coil spring 8 Conductive needle-like body 8a Leg part, 8b Head part, 8c Step part, 8d Engagement part, 8e Needle tip part 8f Slope

Claims (3)

A pair of conductive needles that are supported by a holder so as to be able to move in and out in opposite directions and have a protruding end and an immersion side portion to be brought into contact with the contacted body in the protruding and retracting motion, and the pair of conductive needles A compression coil spring received in a coil spring support hole provided in the holder so as to elastically project the state body from the holder in directions opposite to each other,
Axis of the both conductive acicular body, the coil spring support holes so that by facing each other disposed vital each retracted portion between so as to be point-symmetric with respect to the center of the coil spring support hole Extending in the direction,
The always for sliding contact with one another when the retractable movement by strike against each other's in both conductive needle members of the respective retracted portion between the compression coil in spring,
A pair of needle-like bodies that support the respective intermediate portions of the both conductive needle-like bodies on the holder so as to reciprocate in the axial direction of the coil spring support hole at a point-symmetrical position with respect to the center of the coil spring support hole. Providing support holes,
Each intermediate portion of the both conductive needles is elastically urged by the compression coil springs, and each of the elastic urging positions is substantially point symmetrical with respect to the center of the coil spring support hole,
Each immersive side portion is located on the axis of the coil spring support hole on a plane including the central axis of the coil spring support hole and along the direction in which the immersive portions collide with each other. The conductive contact is characterized in that the distance from the projecting end to each of the projecting ends is larger than the distance from the axial center to each of the bullet energizing positions .     Protrusions that can be engaged with each other against the elastic urging force of the compression coil spring are formed at the respective end portions of the both conductive needle-like bodies, and the both conductive needle-like bodies are formed by the engagement. The conductive contact according to claim 1, wherein is prevented from coming off in a protruding direction.     The conductive contact according to claim 1, wherein the conductive needle-like body is formed by pressing a plate material.

Images