JP2006237334A - Interboard connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an interboard connection structure connecting wiring boards with a simplified structure without the use of connectors and flexible cables. <P>SOLUTION: In a board component 10 to which the interboard connection structure is applied, an anisotropic pressure conductive member 24 is pressurized by tightening force of a screw 32 and a nut 34 between printed boards 12, 14 to bring metal particles 28 in rubber 26 into contact with each other in a plate thickness direction of the printed boards 12, 14. Consequently, a plurality of first contacts 18 of the printed board 12 and a plurality of second contacts 19 of the printed board 14 become conductive via the anisotropic pressure conductive member 24 to electrically connect the printed boards 12, 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inter-board connection structure for electrically connecting a plurality of wiring boards such as a printed board and a flexible printed board.

  When the wiring boards are electrically connected to each other, in general, they are connected via a dedicated connector mounted on the wiring boards, or connected via a flexible cable or the like connected to the connector ( For example, see Patent Document 1).

  However, in the case of the above configuration, since the connector must be mounted on the wiring board, problems such as a reduction in the mounting density of components and an increase in the board area arise.

On the other hand, wiring boards are also connected to each other using a flexible cable integrated wiring board. However, a flexible cable integrated wiring board is expensive and has a problem of high cost.
JP-A-8-293672

  The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a board-to-board connection structure that allows wiring boards to be connected with a simple structure without using connectors or flexible cables.

  In order to solve the above problems, the inter-board connection structure of the invention according to claim 1 is an inter-board connection structure for electrically connecting a pair of wiring boards to each other on the back surface of one of the wiring boards. A first contact formed, a second contact formed on the surface of the other wiring board, facing the first contact, and provided between the pair of wiring boards, the first contact and the second contact The anisotropic pressurizing conductive material that makes contact between the first contact and the second contact by being pressed between the pair of wiring boards and the pair of wiring boards integrally. And a fastener that presses the anisotropic pressure conductive material between the pair of wiring boards by fastening.

  In the inter-board connection structure according to claim 1, the first contact formed on the back surface of one wiring substrate and the second contact formed on the surface of the other wiring substrate are opposed to each other. An anisotropic pressure conductive material provided between a pair of wiring boards is in contact with the contact and the second contact. The anisotropic pressure conductive material is pressed between the pair of wiring boards by integrally fastening the pair of wiring boards with a fastener. As a result, the anisotropic pressure conductive material conducts between the first contact and the second contact, and the pair of wiring boards are electrically connected.

  As described above, in the inter-board connection structure according to claim 1, since the structure is such that the pair of wiring boards are electrically connected by pressurizing the anisotropic pressure conductive material between the pair of wiring boards. There is no need to use a connector or a flexible cable for electrical connection between the boards, and the structure is simple.

  The inter-board connection structure of the invention according to claim 2 is the inter-board connection structure according to claim 1, wherein the first contact, the second contact, and the anisotropic pressure conductive material are formed by the fastener. It is provided corresponding to the fastening part of a pair of wiring boards.

  In the inter-board connection structure according to claim 2, the first contact point, the second contact point, and the anisotropic pressure conductive material are provided corresponding to the fastening portion of the pair of wiring boards by the fastener. That is, since it is the structure by which both are electrically connected in the fastening site | part of a pair of wiring board, space can be utilized effectively.

  According to a third aspect of the present invention, there is provided the inter-board connection structure according to the second aspect, wherein the fastener is a male screw and a female screw, and the pair of wiring boards has the male screw respectively. A plurality of through holes are formed, and a plurality of the first contacts and the second contacts are arranged in a ring shape along a circumferential direction of each screw hole, and the anisotropic pressure conductive material is formed of the male screw. It is provided around.

  In the inter-board connection structure according to claim 3, screw holes are formed in each of the pair of wiring boards, and the pair of wiring boards are integrally formed by male screws passing through these screw holes being screwed into the female screws. Is concluded. Here, a plurality of the first contacts and the second contacts are arranged in a ring shape along the circumferential direction of each screw hole, and the anisotropic pressurization conduction that contacts these first and second contacts. The material is provided around the male screw. For this reason, the fastening force by the male screw and the female screw acts uniformly between the anisotropic pressure conductive material and each first contact, and between the anisotropic pressure conductive material and each second contact. Therefore, the contact state between the anisotropic pressure conductive material and each of the contacts is stabilized.

  The inter-board connection structure of the invention according to claim 4 is the inter-board connection structure according to claim 2 or claim 3, wherein the male screw and the female screw have conductivity, and the one of the wiring boards A first screw contact that contacts the male screw is formed at the peripheral portion of the screw hole, and a second screw contact that contacts the female screw at the peripheral portion of the screw hole of the other wiring board. In addition, the first screw contact and the second screw contact are electrically connected via the male screw and the female screw.

  5. The inter-board connection structure according to claim 4, wherein the first screw contact formed on the peripheral portion of the screw hole of one wiring substrate and the second screw formed on the peripheral portion of the screw hole of the other wiring substrate. The contact is conducted through a male screw and a female screw. That is, since the male screw and the female screw for fastening the pair of wiring boards are also used for electrical connection of the pair of wiring boards, the space can be used more effectively.

  The inter-board connection structure according to a fifth aspect of the present invention is the inter-board connection structure according to any one of the first to fourth aspects, wherein the anisotropic pressure conductive material is a peripheral edge of the pair of wiring boards. And the gap between the pair of wiring boards is sealed.

  In the inter-board connection structure according to claim 5, the pair of wiring boards is sealed with an anisotropic pressure conductive material surrounding the periphery. Therefore, it is possible to prevent water or dust from entering between the pair of wiring boards.

  As described above, in the inter-board connection structure according to the present invention, the wiring boards can be connected with a simple structure without using a connector or a flexible cable.

<First Embodiment>
FIG. 1 is a schematic cross-sectional view showing the configuration of a board component 10 to which the inter-board connection structure according to the first embodiment of the present invention is applied.

  The board component 10 includes a printed board 12 and a printed board 14 as a pair of wiring boards. Circular screw holes 16 are respectively formed in the printed circuit boards 12 and 14, and the printed circuit boards 12 and 14 are arranged in parallel with the screw holes 16 being arranged coaxially.

  A plurality (eight in the first embodiment) of first contacts 18 are formed around the screw hole 16 on the back surface (the lower surface in FIG. 1) of the printed circuit board 12. A plurality of second contacts 19 are formed on the surface of the printed board 14 (upper surface in FIG. 1) around the screw holes 16 so as to face the plurality of first contacts 18.

  The first contact 18 and the second contact 19 are contacts for electrically connecting the printed circuit boards 12 and 14, as shown in FIG. 2, along the circumferential direction of each screw hole 16 (each screw Along the virtual circle concentric with the holes 16, they are arranged in a ring shape. The first contact 18 and the second contact 19 are electrically connected to components (not shown) mounted on the printed circuit boards 12 and 14 via the printed wiring 20 respectively.

  On the other hand, a first screw contact 22 is formed on the front surface of the printed circuit board 12 (upper surface in FIG. 1) at the periphery of the screw hole 16, and the back surface of the printed circuit board 14 (lower surface in FIG. 1). A second screw contact 23 is formed on the peripheral surface of the screw hole 16 on the surface). The first screw contact 22 and the second screw contact 23 are electrically connected to components (not shown) mounted on the printed circuit boards 12 and 14 via printed wirings (not shown), respectively. In the embodiment, a part of the earth circuit is configured.

  On the other hand, an anisotropic pressure conductive material 24 is provided between the printed circuit board 12 and the printed circuit board 14 at a position corresponding to each screw hole 16. As shown in FIG. 3A, the anisotropic pressure conductive material 24 is formed by arranging metal particles 28 in a rubber 26 (for example, silicon rubber), which is shown in FIG. 3B. In this way, the metal particles 18 in the rubber 26 come into contact with each other in the pressurizing direction due to the elastic deformation due to the pressure P applied (shown in the direction of arrow A in FIG. 3B). To conduct).

  In the first embodiment, the anisotropic pressure conductive material 24 is formed in, for example, a cylindrical shape and is arranged coaxially with each screw hole 16. One contact 18 and eight second contacts 19 of the printed circuit board 14 are in contact with each other.

  A circular through hole 30 is formed at a position corresponding to the screw hole 16 in the central portion of the anisotropic pressure conductive material 24. A screw 32 as a male screw passes through the through hole 30 and each screw hole 16 of the printed circuit boards 12 and 14, and a nut 34 as a female screw is screwed into the distal end side of the screw 32. . As a result, as shown in FIG. 4, the printed circuit boards 12 and 14 are integrally fastened, and the anisotropic pressure conductive material 24 is interposed between the printed circuit boards 12 and 14 by the fastening force between the screws 32 and the nuts 34. And is elastically deformed by a predetermined amount.

  In this state, the screw 32 is in contact with the first screw contact 22 of the printed circuit board 12, and the nut 34 is in contact with the second screw contact 23 of the printed circuit board 14. Both the screw 32 and the nut 34 have conductivity, and the first screw contact 22 and the second screw contact 23 are electrically connected via the screw 32 and the nut 34.

  Next, the operation of the first embodiment will be described.

  In the board component 10 having the above configuration, as described above, the anisotropic pressure conductive material 24 is pressed between the printed boards 12 and 14 by the fastening force of the screw 32 and the nut 34, as shown in FIG. Further, the metal particles 28 in the rubber 26 come into contact with each other in the thickness direction of the printed circuit boards 12 and 14. As a result, the plurality of first contacts 18 of the printed circuit board 12 and the plurality of second contacts 19 of the printed circuit board 14 become conductive, and the printed circuit boards 12 and 14 are electrically connected.

  Thus, in the board component 10 according to the first embodiment, the printed circuit boards 12 and 14 are electrically connected by pressing the anisotropic pressure conductive material 24 between the printed circuit board 12 and the printed circuit board 14. Therefore, there is no need to use a connector or a flexible cable to electrically connect the printed circuit boards 12 and 14, and the structure is simple.

  Further, in the board component 10 according to the first embodiment, since both are electrically connected around the screw hole 16 for fastening (fixing) the printed circuit boards 12 and 14, the space is reduced. Effective use can be achieved. Thereby, for example, the component mounting density of the printed circuit boards 12 and 14 can be increased, and the board area can be reduced.

  Furthermore, in the board component 10 according to the first embodiment, a plurality of first contacts 18 of the printed board 12 and second contacts 19 of the printed board 14 are arranged in a ring shape along the circumferential direction of each screw hole 16. Has been. Moreover, the anisotropic pressure conductive material 24 is formed in a columnar shape and is arranged concentrically with the screw hole 16, and the screw 32 penetrates the through hole 30 formed in the central portion. For this reason, the fastening force by the screw 32 and the nut 34 is between the anisotropic pressure conductive material 24 and each first contact 18 and between the anisotropic pressure conductive material 24 and each second contact 19. Since it acts uniformly, the contact state between the anisotropic pressure conductive material 24 and each first contact 18 and each second contact 19 is stabilized.

  Furthermore, in the board component 10 according to the first embodiment, the first screw contact 22 of the printed circuit board 12 and the second screw contact 23 of the printed circuit board 14 are electrically connected via the screw 32 and the nut 34. is doing. Thus, since the screw 32 and the nut 34 are also used for electrical connection of the printed circuit boards 12 and 14, the space can be used more effectively.

  As described above, in the board component 10 according to the first embodiment of the present invention, the printed boards 12 and 14 can be connected with a simple structure without using a connector or a flexible cable.

In the first embodiment, the anisotropic pressure conductive material 24 is formed in a cylindrical shape. However, the present invention is not limited to this, and the anisotropic pressure conductive material is formed in a prismatic shape. Alternatively, it may be divided into a plurality of parts.
<Second Embodiment>
Next, a second embodiment of the present invention will be described. Note that the same reference numerals as those in the first embodiment are given to the configurations and operations basically similar to those in the first embodiment, and the description thereof will be omitted.

  FIG. 5 is a schematic exploded perspective view showing the configuration of a board component 50 to which the inter-board connection structure according to the second embodiment of the present invention is applied.

  The board component 50 includes a pair of printed circuit boards 52 and a printed circuit board 54 that are formed in a rectangular shape having the same outer dimensions and arranged in parallel. Screw holes 16 are formed in the four corners of the printed circuit boards 52 and 54, respectively.

  A plurality of first contacts 18 (not shown) are formed around each screw hole 16 on the back surface (the lower surface in FIG. 5) of the printed circuit board 52, and the surface of the printed circuit board 54 (in FIG. 5). On the upper surface), a plurality of second contacts 19 (not shown) that face the plurality of first contacts 18 are formed around each screw hole 16. Further, a first screw contact 22 (not shown) is formed at the peripheral portion of each screw hole 16 on the front surface (the upper surface in FIG. 5) of the printed circuit board 52 and the back surface (the lower surface in FIG. 5). A second screw contact 23 (not shown) is formed on the peripheral surface of each screw hole 16 on the side surface.

  Between the printed boards 52 and 54, an anisotropic pressure conductive material 56 formed in a rectangular ring shape corresponding to these outer shapes is provided. Similar to the anisotropic pressure conductive material 24 according to the first embodiment, the anisotropic pressure conductive material 56 is formed by arranging metal particles in rubber, and the printed circuit board 52 is not illustrated. The plurality of first contacts 18 and the plurality of second contacts 19 (not shown) of the printed circuit board 54 are in contact with each other.

  A circular through hole 58 is formed in the anisotropic pressure conductive material 56 at a position corresponding to each screw hole 16 of the printed circuit boards 52 and 54. Screws 32 pass through the through holes 58 and the screw holes 16 of the printed circuit boards 52 and 54, respectively, and nuts 34 are screwed onto the distal ends of the screws 32. Thereby, the printed circuit boards 52 and 54 are fastened together. In addition, the anisotropic pressure conductive material 56 is pressed between the printed circuit boards 52 and 54 by the fastening force between the screw 32 and the nut 34, and is elastically deformed by a predetermined amount. One contact 18 and a plurality of second contacts 19 (not shown) of the printed circuit board 54 are electrically connected via an anisotropic pressure conductive material 56. Moreover, in this state, the peripheral edges of the printed circuit board 52 and the printed circuit board 54 are surrounded by the anisotropic pressure conductive material 56.

  The substrate component 50 having the above configuration also has basically the same effect as the substrate component 50 according to the first embodiment. Moreover, in this board component 50, the space between the printed boards 52 and 54 is sealed by the anisotropic pressure conductive material 56 formed in an annular shape, so that water, dust, etc. are present between the printed boards 52 and 54. Intrusion can be prevented.

  In the first embodiment and the second embodiment, the case where the inter-board connection structure of the present invention is applied to a connection portion between printed circuit boards has been described. However, the present invention is not limited to this. The inter-board connection structure can also be applied to a connection portion between the printed circuit board and the flexible printed circuit board and a connection portion between the flexible printed circuit boards.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing in the state before a fastening, showing the partial structure of the board | substrate component to which the board | substrate connection structure concerning the 1st Embodiment of this invention was applied. It is a top view which shows the partial structure of the wiring board which concerns on the 1st Embodiment of this invention. The structure of the anisotropic pressurization electrically conductive material which concerns on the 1st Embodiment of this invention is shown, (A) is sectional drawing in a natural state, (B) is sectional drawing in the state to which the pressure was applied. . It is sectional drawing in the fastening state which shows the partial structure of the board | substrate component to which the board | substrate connection structure which concerns on the 1st Embodiment of this invention was applied. It is a schematic exploded perspective view which shows the whole structure of the board | substrate component to which the board | substrate connection structure concerning the 2nd Embodiment of this invention was applied.

Explanation of symbols

10 Inter-board connection structure 12 Printed circuit board (wiring board)
14 Printed circuit board (wiring board)
16 Screw hole 18 First contact 19 Second contact 22 First screw contact 23 Second screw contact 24 Anisotropic pressure conductive material 32 Screw (male thread)
34 Nut (Female thread)
50 Anisotropic Pressurized Conductive Material 52 Printed Circuit Board 54 Printed Circuit Board 56 Anisotropic Pressurized Conductive Material

Claims (5)

A board-to-board connection structure for electrically connecting a pair of wiring boards,
A first contact formed on the back surface of one of the wiring boards;
A second contact formed on the surface of the other wiring board and facing the first contact;
It is provided between the pair of wiring boards, is in contact with the first contact and the second contact, and is pressurized between the pair of wiring boards to conduct between the first contact and the second contact. Anisotropic pressure conductive material to be
A fastener that integrally fastens the pair of wiring boards and pressurizes the anisotropic pressure conductive material between the pair of wiring boards by the fastening,
A board-to-board connection structure comprising:   The said 1st contact, the said 2nd contact, and the said anisotropic pressurization electrically-conductive material are provided corresponding to the fastening site | part of the said pair of wiring board by the said fastener. Board-to-board connection structure. The fastener is a male screw and a female screw,
Each of the pair of wiring boards is formed with a screw hole through which the male screw passes,
A plurality of the first contacts and the second contacts are arranged in a ring shape along the circumferential direction of each screw hole,
The anisotropic pressure conductive material is provided around the male screw.
The board-to-board connection structure according to claim 2. The male screw and the female screw have conductivity,
A first screw contact with which the male screw contacts is formed at the peripheral edge of the screw hole of the one wiring board,
A second screw contact with which the female screw contacts is formed at the peripheral edge of the screw hole of the other wiring board,
And the first screw contact and the second screw contact are conducted through the male screw and the female screw,
The inter-board connection structure according to claim 3.   The said anisotropic pressurization electrically conductive material surrounds the periphery of the said pair of wiring board, and seals between the said pair of wiring boards, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Board-to-board connection structure.

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