JP5006162B2 - Electrical connection member - Google Patents

Description

  The present invention belongs to the technical field of a sandwiched electrical connection member having a double-sided contact that is sandwiched between an electronic component and a substrate or between a substrate and a substrate and electrically connects the respective electrodes.

FIG. 4 is a cross-sectional view of a conventional electrical connection sheet.
A wire 19 is obliquely embedded in the rubber elastic sheet body 20, and spherical contact portions 17 and 18 are provided at both ends of the wire.
In this electrical connection sheet, a circuit board is placed on the lower side, a semiconductor package is placed on the upper surface, and a predetermined pressure is applied in the vertical direction so that the contact portions 17 and 18 are in contact with the electrodes of the circuit board and the semiconductor package, respectively. The electric connection is obtained (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-35789 (paragraphs [0017], [0022], FIGS. 1 and 5)

However, in such a spherical contact portion, when it comes into contact with an electrode of a circuit board or a pad of a semiconductor package, it must be point contact, and there is a problem that contact resistance is inevitably high.
Also, if the connected body has a solder resist and the pad is in a recessed position where the pad is recessed, the wire and the contact portion are in close contact with the rubber elastic sheet body, so that it cannot sufficiently cope with the recess. In addition, there is a problem that the contact resistance is further increased.

  In view of the above-mentioned problems of the prior art, the object of the present invention is to make contact with the electrodes of the circuit board and the pads of the semiconductor package in surface contact, and further, by having a solder resist, the pads etc. are in a recessed position. Even if it exists, it exists in implement | achieving the electrical connection member which has a contact part which can carry out surface contact sufficiently.

The present invention has the following means in order to solve the above problems.
A first configuration of the present invention is an electrical connection member characterized in that the following members (a) and (b) are stacked as shown in (c).
(A) It is made of an elastic material, and one set of protrusions is formed in a line on the one side of the plate-like base portion at a predetermined interval. Is an elastic member that has a through-hole penetrating through the base portion, and the through-hole is filled so that the conductor is flush with the surface of the elastic material at both ends.
(B) On one side of the thin film resin, one conductor foil having a length and a width extending over the two protrusions in one set is arranged in accordance with the arrangement of the protrusions of the elastic member, and close to one end of the conductor foil. Is a sheet member having a through-hole penetrating through the thin-film resin, and being able to conduct with the other conductor foil formed on the other side of the opposite surface through the through-hole.
(C) The two elastic members in (a) are faced to the surface without projections, and the positions of the projections through which the conductor penetrates and the positions of the projections that do not penetrate each other are aligned. ), The through hole of the sheet member is aligned with the conductor of the elastic member on the other side of the sheet member, the conductor foil portion is aligned with the conductor of the elastic member on the one side of the sheet member, A stacked structure in which the above-mentioned five layers of members are placed in close contact with each other on the side where the protrusions are located, with one side of the sheet member being the front side and the through-holes being aligned with the conductors of the elastic member.

  The second configuration of the present invention is characterized in that, in the first configuration, the thin film resin has a cut along the periphery of one conductor foil near the end of the sheet member that does not have a through hole. It is an electrical connection member.

  In contrast to the electrical connection member obtained by superimposing the elastic member (A) and the sheet member (B) of the problem solving means as shown in (C), on the upper surface side, a substrate having a pad (referred to as an upper substrate) is provided. The pad is arranged to face the surface of the sheet member in accordance with the position of the protrusion not filled with the conductor, and the pad of the substrate having the pad on the lower surface side (hereinafter referred to as the lower substrate) is filled with the conductor toward the sheet member surface. If the upper and lower boards are pressed toward the electrical connection member and the upper and lower boards are pressed against the electrical connection members, the conductor foil of the sheet member is pushed by the bumps of the conductor and pressed against the pads of the board. Contact is made and electrical connection is obtained, but at this time, the conductor filled in the protrusion of the elastic member on the opposite side across the sheet member in the middle receives the pressure from the opposite substrate surface, and the protrusion corresponding to the position of the pad Press from the back Will kick, the contact of the conductor foil pad and the sheet is ensured contact becomes more pressurized surface contact pad and the conductive foil.

  Further, since the contact structure is as described above, the thin film resin and the conductive foil of the sheet member are flexible even when the solder resist is provided on the substrate and the pad is in a position where the pad is retracted (recessed) from the solder resist surface. Therefore, even if the pad is in a position deeper than the surface, there is an effect that reliable surface contact can be obtained by adapting to the depression.

The conductor filled in the through hole of the protrusion of the elastic member is best a highly conductive and rigid conductor such as solder.
In this case, the solder ball or solder paste may be once melted and then cured. In this case, it is best to previously form a metal thin film on the inner peripheral surface of the through hole by plating or the like so that the conductor is uniformly disposed in the through hole.

Hereinafter, embodiments of the electrical connection member of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an electrical connection member of the present invention.
(A) is a state before bonding an elastic member and a sheet member of five layers, and FIG. (B) is a bonded state.
2 is a plan view of the elastic member 1 of FIG. 1 as viewed from the side with the protrusions (FIG. 2A), a cross-sectional view thereof (same as FIG. 2B), and a plan view of the sheet member 10 as viewed from one side. It is.

  The elastic member 1 is made of, for example, an elastic material 2 such as siloxane-based silicon rubber, and has elasticity. The elastic member 1 has a predetermined interval on one surface of the plate-like base portion, for example, according to the interval between the electrode pads on the connection target substrate. The first protrusion 3 and the second protrusion 6 are arranged in a matrix, and the first protrusion 3 is provided with a through-hole 4 in which a conductor 5 such as solder that is more rigid than the elastic material 2 is provided. Filled. On the other hand, the second protrusion 6 is a protrusion made of only an elastic material. The surface on the side without protrusions is a flat surface.

The sheet member 10 is made of a film such as aramid having a thickness of 10 μm or less, and through holes 8 are provided in a matrix at a predetermined pitch. The elastic member 1 includes the through holes on one surface of the sheet member 10. One conductor foil 9 is disposed by vapor deposition or the like to cover the arrangement position of the first projection 3 and the second projection 6.
In addition, the other conductor foil 9 'connected to the conductor 5 is provided on the opposite side through the through hole 8 by vapor deposition or the like, and one conductor foil 9 and the other conductor foil 9' are connected. ing.
A notch 11 is provided around the portion of one conductor foil 9 extending from the through hole 8 so that one conductor foil 9 can be bent together with the thin film resin.

  Then, when the other surface side of the sheet member 10 on which the other conductor foil 9 ′ is formed is brought into contact with the conductor 5 of the first protrusion 3 of the elastic member 1, the conductor 5 and the sheet member 10 are formed on one surface. The other conductor foil 9 is connected.

  The positional relationship between (a) and (c) in FIG. 2 matches the position of the conductor 5 in (a) with the position of the through hole 8 in (c), and the second protrusion 6 in (a) and (c). The left diagonally lower portion of each one of the conductor foils 9 is made to coincide.

  FIG. 1 (a) uses such an elastic member 1 and a sheet member 10, and a flat surface without projections of the elastic member 1 on one surface (for example, the upper surface) of one sheet member 10 is a sheet. The elastic member 1 faces the member 10 so that the position of the second protrusion 6 and the position of the through hole 8 of the sheet member 10 face each other, and the other surface (for example, the lower surface) is another elastic member 1. The flat surface having no protrusion is directed toward the sheet member 10 so that the position of the conductor 5 filled in the through hole 4 of the first protrusion 3 is aligned with the position of the through hole 8 of the sheet member 10. I am letting.

And the one surface side in which one conductor foil 9 of another sheet member 10 is formed in the outer surface of each of the upper and lower elastic members 1 faces the front side, and the through hole 8 and the conductor 5 of the elastic member 1 Are facing each other so that they face each other.
When facing each other and contacting each other as shown in (b), the conductor 5 of the elastic member 1 and one conductor foil 9 formed on one surface of the sheet member 10 are electrically connected and the elastic member 1 A five-layer structure composed of the sheet member 10 is configured.

FIG. 3 is a diagram in which a set portion of the first protrusion and the second protrusion is taken out from FIG. 1 and enlarged, and a circuit board to be connected is arranged on the upper side surface and the lower surface side thereof.
The upper substrate pad 14 is disposed so as to correspond to the position of the second protrusion 6 of the elastic member 1 on the upper side of the electrical connection member, and the lower substrate pad 15 is the second of the elastic member 1 on the lower side of the electrical connection member. It arrange | positions so that it may respond | correspond to the position of protrusion 6 of this.

  In this state, as shown in (b), when a force that sandwiches the electrical connection member is applied to the upper and lower substrates by a pressing mechanism (not shown), first, the upper and lower sheet members 10 come into contact with the upper and lower substrates. When the pressure is further increased, the conductors 5 of the upper and lower elastic members 1 receive a reaction force from the substrate through the through hole 8 portion of the sheet member 10, and this reaction force is opposite to the opposite side via the middle sheet member 10. The second projection 6 of the elastic member 1 is pressed from the bottom portion of the projection toward the tip of the projection.

As a result, the second protrusions 6 of the upper and lower elastic members 1 press the sheet member 10 against the upper substrate pad 14 and the lower substrate pad 15. Since the pressed portion is provided with one conductor foil 9 that continues from the portion of the through hole 8, the conductor foil comes into contact with the upper substrate pad 14 and the lower substrate pad 15. In addition to the elasticity of the second protrusions, the thin film resin 7 and one conductor foil 9 of the sheet member 10 are both thin and flexible, so that the substrate pads are the upper substrate pad 14 and the lower substrate pad 15. Thus, even if the pad surface is depressed due to the presence of the solder resist, the pad is deformed in accordance with the depression and each pad and one conductor foil 9 are in surface contact.
When there is a notch 11 as shown in FIG. 2C around one conductor foil 9, there is an effect that the surface contact is further facilitated.

  As described above, the upper substrate pad 14 is in contact with one conductor foil 9 of the upper sheet member 10 and through the through-hole 8 portion, the conductor 5 of the upper elastic member 1 and the middle sheet member 10 in contact therewith. It is electrically connected to the lower substrate pad 15 through one conductor foil 9, its through hole 8, the conductor 5 of the lower elastic member 1, the through hole 8 of the lower sheet member 10, and its one conductor foil 9. Will be.

In the present embodiment, the arrangement of the first protrusion and the second protrusion of the elastic member and the through holes and conductor foil of the sheet member is as shown in FIG. 2, but these arrangements are not limited to these. Rather, various arrangements can be adopted in accordance with the arrangement of the electrodes of the circuit board to be connected and the pads of the semiconductor chip.
In this embodiment, the conductor 5 is formed of solder or the like, but a conductive member such as a resin containing conductive particles, a conductive adhesive, or the like may be used.

  One of the sheet member and the other conductor foil 9 ′ of the sheet member 10 and the protrusion tip side of the conductor 5, the end opposite to the protrusion of the conductor 5 and one of the sheet members by solder reflow in a state where five layers are laminated with the elastic member and the sheet member The conductor foil 9 may be soldered and integrated as an electrical connection member.

It is sectional drawing of the Example of the electrical-connection member of this invention. It is the protrusion side top view of the elastic member which comprises the electrical connection member of this invention, A arrow direction sectional drawing, and the conductor foil side top view of a sheet | seat member. FIG. 2 is an enlarged cross-sectional view of a set portion of a first protrusion and a second protrusion from FIG. It is sectional drawing of the conventional electrical connection sheet | seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elastic member 2 Elastic material 3 1st protrusion 4 Through-hole 5 Conductor 6 2nd protrusion 7 Thin film resin 8 Through-hole 9 One conductor foil 9 'The other conductor foil 10 Sheet member 11 Notch 12 Upper board 13 Lower board 14 Upper substrate pad 15 Lower substrate pad 16 Solder resist 17 Contact portion 18 Contact portion 19 Wire 20 Rubber elastic sheet body

Claims (2)

An electrical connection member characterized by having a structure in which the following members (a) and (b) are stacked as shown in (c).
(A) It is made of an elastic material, and one set of protrusions is formed in a line on the one side of the plate-like base portion at a predetermined interval. Is an elastic member that has a through-hole penetrating through the base portion, and the through-hole is filled so that the conductor is flush with the surface of the elastic material at both ends.
(B) On one side of the thin film resin, one conductor foil having a length and a width extending over the two protrusions in one set is arranged in accordance with the arrangement of the protrusions of the elastic member, and close to one end of the conductor foil. Is a sheet member having a through-hole penetrating through the thin-film resin, and being able to conduct with the other conductor foil formed on the other side of the opposite surface through the through-hole.
(C) The two elastic members in (a) are faced to the surface without projections, and the positions of the projections through which the conductor penetrates and the positions of the projections that do not penetrate each other are aligned. ), The through hole of the sheet member is aligned with the conductor of the elastic member on the other side of the sheet member, the conductor foil portion is aligned with the conductor of the elastic member on the one side of the sheet member, A stacked structure in which the above-mentioned five layers of members are placed in close contact with each other on the side where the protrusions are located, with one side of the sheet member being the front side and the through-holes being aligned with the conductors of the elastic member.   2. The electrical connection member according to claim 1, wherein the thin film resin has a cut along the periphery of one of the conductor foils near the end of the sheet member having no through hole.

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