JPH09106868A - Electric connection structure between circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a connector unrequired, thereby obtain an electric connection structure at low cost by providing a conductive line itself with a connector function. SOLUTION: On the opposite end face of a printed circuit board 20 arranged with a specified gap G1 spaced on the same flat face, a longitudinally extending semi-circle groove 22 in which the internal face is plated by means of a metal is formed, and a contact point part with a tape wire 10 is formed. Both end sides of a conductor wire stripe 11 of the tape wire 10 are bent and molded in its specified shape in advance by means of bending processing. In natural state, a distance Al between both connection end parts 11b of the conductive wire stripe is set wider than the gap G1 between contact parts 23. When the tape wire 10 is pressed from above in a gap between both boards 20 by this constitution, the conductive wire stripe 11 has spring characteristics, therefore, both connection end parts 11b are pressed to the contact point part 23, and electrical connection is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connection structure for connecting a pair of circuit boards.

[0002]

2. Description of the Related Art For example, as a structure for connecting and connecting two upper and lower printed circuit boards, a tape electric wire as shown in FIG. 17 is generally used.
For example, one end of the tape electric wire 2 is soldered to one printed circuit board 1 and the connector 3 is connected to the other end of the tape electric wire 2. A board mounting type connector 5 is soldered and fixed to the other printed circuit board 4, and the connector 3 of the tape electric wire 2 is fitted and connected to the connector 5.

[0003]

By the way, in general, a tape electric wire has only a function of securing a conductive path, and it should not have a connector function of connecting to and disconnecting from a contact of another electric circuit. . In order to connect to another electric circuit without depending on the soldering or crimping method, it is necessary to elastically contact the contact part of the counterpart circuit with a predetermined contact pressure, but the conductor of the tape wire. Is formed by a flexible annealed copper wire or a stranded wire in consideration of wiring workability and the like.

Therefore, in the conventional electrical connection structure between circuit boards, as described above, the connector 3 is connected to the end portion of the tape electric wire 2, and the terminal fitting 3a having spring property built in the connector 3 (not shown). It was necessary to make a connection via (). However, since the connector 3 as described above is configured by housing a plurality of terminal fittings 3a in the connector housing 3b, the connector housing 3b is molded with resin and the terminal fittings 3a are made of a spring metal plate. There is a problem in that there is a large limit to cost reduction because there is no choice but to manufacture through a complicated process of punching, bending, crimping the electric wire and housing it in the connector housing 3b.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a conductive function itself with a connector function, thereby eliminating the need for a connector and providing a low-cost electrical connection structure.

[0006]

[Means for Solving the Problems and Functions / Effects]

<Invention of Claim 1> The electrical connection structure according to Claim 1 is for connecting between electric circuits formed on a pair of circuit boards, and a conductive wire having a spring characteristic is provided between the circuit boards. It is characterized in that it is arranged so as to be passed over, and the connection ends at both ends of the conductive wire are brought into contact with the contact portions formed on the circuit board with a contact pressure based on the spring characteristics thereof.

In the above structure, since the conductive wire is passed between the contact portions of the circuit board, the electrical connection is formed through the conductive wire. Since this conductive wire has a spring characteristic, it can be contacted to the contact point with the contact pressure necessary for electrical connection, and the connector function is exhibited without the need for a connector equipped with a terminal fitting having a spring characteristic. To be done.

<Invention of Claim 2> In the electrical connection structure of Claim 2, in the above invention, a plurality of conductive wires are arranged at intervals, and these conductive wires are held in parallel by a holding tape. However, it has a feature.

According to this, a plurality of circuits can be connected at the same time, and since the conductive wire is integrated in the form of a tape, it is easy to handle and can be manufactured at low cost.

<Invention of Claim 3> The electrical connection structure of Claim 3 is characterized in that, in the invention of Claim 1 or 2, the connection ends on both sides of the conductive wire are bent into an arc shape. Have. By doing so, the side surface of the arcuate portion can be brought into contact with the contact portion of the other party, so that a stable contact state can be obtained.

<Invention of Claim 4> In the inventions of Claims 1 to 3, the conductive wire may have a mechanical property of a tensile strength of 400 N / mm 2 or more.

In this case, it becomes possible to make contact with the contact portion of the other party at the most appropriate contact pressure,
It becomes possible to obtain a more stable contact state.
Further, it is more preferable that the spring limit value is 250 N / mm 2.

<Invention of Claim 5> In the electrical connection structure according to the invention of Claim 5, in the inventions of Claims 1 to 4, the contact portions of both circuit boards are provided on the surfaces facing each other, and in a free state. The characteristic is that the distance between the connection ends of the conductive wire in (1) is set to be wider than the gap between the contact portions of each circuit board.

With this configuration, when the conductive wire is pushed between the circuit boards, the conductive wire is elastically contracted between the connection end portions, and the connection end portion is inserted into the contact portion by an appropriate contact pressure. When they come into contact with each other, the elastic force causes the conductive wire to be stretched between the circuit boards so that they are naturally fixed.

Therefore, the conductive wire can be stably arranged between the circuit boards without using a special holding structure, and the structure is further simplified.

<Invention of Claim 6> In the electrical connection structure according to the invention of Claim 6, in the inventions of Claims 1 to 4, the respective contact portions of both circuit boards are formed on surfaces opposite to each other, and The feature is that the distance between the connecting ends of the conductive wire in the free state is set to be smaller than the distance between the contact portions of each circuit board.

Thus, when both the circuit boards are sandwiched by the conductive wire, the conductive wire is elastically expanded between the connection end portions and is inserted, and the connection end portion has an appropriate contact pressure with respect to the contact portion. The conductive wires are naturally fixed by sandwiching both circuit boards by the elastic force.

Therefore, the conductive wire is stably fixed to the circuit board without using a special holding structure, and the structure is further simplified.

<Invention of Claim 7> An electrical connection structure according to the invention of Claim 7 is the electrical connection structure according to any one of Claims 2 to 4, in which both circuit boards are separated by a predetermined gap on the same plane. When they are arranged side by side, contact parts are formed on the surfaces of both circuit boards in the same direction, and the holding tape is locked to the circuit board so that the connecting end of the conductive wire becomes the contact part of the circuit board. It has a feature in that it is configured to be in contact with each other.

In this structure, since the holding tape is locked to the circuit board, each connecting end of the conductive wire fixed to the holding tape presses the contact portions of the circuit boards on both sides. . As a result, the connecting end of the conductive wire can contact the contact with the contact pressure necessary for electrical connection, and the connector function is achieved without the need for a connector equipped with a terminal fitting having spring characteristics. To be demonstrated.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Next, some embodiments of the electrical connection structure of the present invention will be specifically described. First, FIGS. 1 and 2 will be described with respect to a tape electric wire 10 used in these embodiments. Let me explain with reference. The tape electric wire 10 has a structure in which a plurality of conductive wires 11 are held side by side with a holding tape 12. As the conductive wire 11, various materials can be used as long as they are conductive wires having spring characteristics. For example, a phosphor bronze wire is preferable, and it is more preferable that it is plated with solder, tin, gold or the like. In addition, copper alloys such as beryllium copper and copper containing iron, and iron-based alloys such as piano wires and stainless wires can be used.

On the other hand, the holding tape 12 is made of a synthetic resin, and both ends of the conductive wire 11 are exposed in order to hold a plurality of conductive wire 11 arranged at intervals along a predetermined direction. In this state, the conductive wire 11 is attached so as to be sandwiched from both sides. Various synthetic resins can be used as the material,
For example, a PET film or a composite resin film obtained by laminating PVC and PET is preferable, and a flame-retardant material is particularly preferable. As a more specific example of the embodiment, the conductive wires 11 are solder-plated phosphor bronze wires having a diameter of 0.65 mm and are arranged at a pitch of 2.5 mm, for example, and the holding tape 12 is shown in FIG. PVC film 12a and P
It is a laminated film composed of ET film 12b, and the PVC film 12a side is bonded to the conductive wire 1
1 is sandwiched, and the thickness is about 1 mm in that state. Further, in order to manufacture the above-mentioned tape electric wire, the conductive wire strips 11 wound around a plurality of drums are arranged side by side along a predetermined direction and drawn out.
The conductive tape 11 group is fixed by the holding tape 12 by intermittently sandwiching the middle part between the upper and lower parts with a film and thermocompression bonding, and then the conductive tape 1 is held between the holding tapes 12.
You just need to cut 1.

<First Embodiment> Now, the tape electric wire 1 described above.
To connect the two printed circuit boards 20 arranged on the same plane with a predetermined gap therebetween by using 0, the configurations shown in FIGS. 3 and 4, for example, are possible.

A conductor pattern 21 forming an electric circuit is formed on the surface of the printed circuit board 20 by printed wiring means, and a semicircular groove 22 extending vertically is formed on the opposing end surface. On the inner surface of the semicircular groove 22, a contact portion 23 is formed by metal plating so as to be continuous with the conductor pattern 21.

The conductor wire strips 11 of the tape electric wire 10 are bent and formed in advance into a predetermined shape by bending at both ends. That is, in the portion protruding from the holding tape 12, a lateral U-shaped folded portion 11a is first formed, a connecting end portion 11b extending downward is formed at the tip thereof, and an upward U-shaped folded portion 11c is formed. ing. In a free state after the conductor wire 11 is bent, the distance A1 between the connecting end portions 11b is equal to the printed circuit board 20.
Wider than the gap G1 between the contact points 23 (A1> G1
), The vertical dimension of the connection end portion 11b is set to be substantially the same as the thickness dimension of the printed circuit board 20.

With this configuration, in order to make a connection between the printed circuit boards 20, the conductor wire 1 is placed in the gap between the boards 20.
The tape electric wire 10 obtained by bending 1 into a predetermined shape is arranged so as to be press-fitted from above. Then, the U-shaped return portion 11c of the conductor wire 11 first comes into contact with the upper surface of the printed circuit board 20, so that the both ends of the conductor wire 11 are elastically deformed along the curved shape of the tape wire 10 to be narrowed. Insertion is allowed. Then, when the U-shaped return portion 11c penetrates below the printed circuit board 20, both elastically deformed so that both connecting end portions 11b of the conductor wire 11 are expanded by the stored elastic force, and the connecting end portion is formed. 11b comes into pressure contact with each contact portion 23 of the printed circuit board 20.

Thus, the tape electric wire 1 is provided between the contact points 23.
An electrical connection is formed via the conductor wire 11 of zero. Since the conductive wire 11 has a spring characteristic, it can be brought into contact with the contact portion 23 with a contact pressure necessary for electrical connection, and the connector function can be achieved without the need for a connector having a complicated terminal fitting. To be demonstrated. Therefore, unlike the conventional electrical connection using a connector, steps such as molding of a connector housing, press molding of a terminal fitting, and assembly are unnecessary, and the conductor wire strip 11 of the tape wire 10 is simply molded into a desired shape. Since only bending work is required, the total cost can be significantly reduced. Further, in this embodiment, since the U-shaped return portion 11c is provided at the tip end portion of the conductor wire strip 11, this is caught by the lower surface of the printed circuit board 20, and the tape electric wire 10 is reliably prevented from falling off.
In order to remove the tape electric wire 10 and disconnect the electric connection, the U-shaped return portion 11c may be pinched and elastically deformed so as to be narrowed.

<Second Embodiment> FIG. 5 shows an example of connection when two printed circuit boards 20 are arranged side by side. The difference from the first embodiment is that the holding tape 12 part is also bent in an arc shape, and the other parts are the same as the first embodiment, and the same parts are denoted by the same reference numerals and duplicate description is omitted. To do.

Even in this case, the same effect as that of the first embodiment can be obtained, and further, since the holding tape 12 portion is also smoothly bent, the entire conductive wire 11 exhibits a spring function, and the tape electric wire. Even if 10 is small, a sufficient contact pressure can be obtained.

<Third Embodiment> FIGS. 6 and 7 show a third embodiment of the present invention. Here, 2 arranged in upper and lower two stages
An example of forming a connection between a number of printed circuit boards 30 is disclosed.

Conductor patterns (not shown) forming an electric circuit are formed on the upper and lower printed circuit boards 30 by printed wiring means, and the surfaces of both circuit boards 30 facing each other, that is, the upper printed circuit board 30. The lower surface,
Contact portions 31 are formed on the upper surface of the lower printed circuit board 30 so as to face each other.

On the other hand, in the tape electric wire 10, the conductive wire 11 is bent together with the holding tape 12 as in the second embodiment, and the arc-shaped bent-back portion 11d is formed in the portion extending vertically from the holding tape 12. Furthermore, the other end is bent back in the opposite direction. The bent back portion 11d
Functions as a connecting end of the conductive wire strip 11, and when the tape electric wire 10 is inserted between the printed circuit boards 30, each bent back portion 11d contacts the contact portion 31 of the printed circuit board 30 with a predetermined contact pressure. And an electrical connection is obtained. Therefore, the spacing dimension A3 between the bent-back portions 11d is set to be larger than the spacing dimension G3 between the contact portions 31 of both printed circuit boards 30 in the natural state of the tape electric wire 10 (A3
> G3) It is set.

Also in this embodiment, as in the first embodiment, the connector function is exerted only by the tape electric wire 10 without the need for a connector, so that the total cost can be greatly reduced. To be

<Fourth Embodiment> FIG. 8 shows a fourth embodiment of the present invention. Here again, although an example of forming a connection between two printed circuit boards 30 arranged in two layers above and below is disclosed,
The formation position of the contact portion 31 is different from that in the third embodiment.

That is, the upper and lower printed circuit boards 30
A conductor pattern (not shown) forming an electric circuit is formed on the printed circuit board by printed wiring means, and the surfaces of the two circuit boards 30 opposite to each other, that is, the upper printed circuit board 30.
The contact portions 31 are formed on the upper surface of and the lower surface of the lower printed circuit board 30 so as to face each other.

On the other hand, the tape electric wire 10 has a structure similar to that of the third embodiment. The tape electric wire 10 is first bent back in an arc shape at a portion extending vertically from the holding tape 12, and further, a bent back portion 11e in the opposite direction is formed at the tip thereof. Has been done. The bent-back portion 11e functions as a connection end of the conductive wire strip 11, and when the tape electric wire 10 is mounted so as to sandwich the upper and lower printed circuit boards 30, each bent-back portion 11e contacts the printed circuit board 30. The part 31 is contacted by a predetermined contact pressure, and an electrical connection is obtained. Therefore, the two bent back portions 11e
A4 is a distance G4 between the contact portions 31 of both printed circuit boards 30 in the natural state of the tape electric wire 10.
It is set to be smaller than the above (A4 <G4).

Also in this embodiment, as in the first embodiment, the connector function is exerted only by the tape electric wire 10 without the need for a connector, so that the total cost can be significantly reduced. To be

<Fifth Embodiment> FIG. 9 shows a fifth embodiment of the present invention. Here, a connection example for connecting between two printed circuit boards 40 arranged on the same plane with a predetermined gap again is disclosed. However, both printed circuit boards 4 are disclosed.
This is an example in which the contact portion 41 is formed on the surface of 0 in the same direction.

A conductor pattern (not shown) is formed on the printed circuit board 40 by printed wiring means, and contact portions 41 are formed near the edges of the upper surface of the conductor pattern.

On both ends of the conductor wire 11 of the tape electric wire 10, arc-shaped bent portions 11f which are convex downward are formed beforehand by bending. And the holding tape 12
An attachment member 14 having a fixed claw 13 is fixed to the printed circuit board 4 by adhesion or the like.
It can be inserted between 0s.

The tape electric wire 10 is integrated with the printed circuit board 40 by inserting the fixing claw 13 of the mounting member 14 into the gap between the printed circuit boards 40 and engaging with the printed circuit board 40. In this mounted state, the arc-shaped bent portion 11f of the conductor wire strip 11 functions as a connection end portion, which is pressed against the contact portion 41 of the printed circuit board 40. Therefore, since the conductive wire 11 has a spring characteristic, the contact portion 4
1 can be contacted with the contact pressure necessary for electrical connection, and the connector function can be exhibited without the need for a connector, and the total cost can be greatly reduced also in this embodiment.

<Sixth Embodiment> FIG. 10 shows a sixth embodiment according to an example of connection between two printed circuit boards 50 which are also arranged side by side.

A conductor pattern (not shown) is formed on the printed circuit board 50 by a printed wiring means, contact points 51 are formed near the edges of the upper surface of the printed circuit board 50, and a contact pattern is formed near the contact points 51. The stop hole 52 is formed.

On the other hand, the tape electric wire 10 is formed by integrating a plurality of conductor wires 11 with a holding tape 12.
Of the one group, two on the left and right sides in the arrangement direction are bent downward at both ends to form a guide shaft portion 11g, and a locking return portion 11h is formed at the lower end thereof. Further, as for the remaining conductor wire strips 11 sandwiched between the left and right sides in the arrangement direction, arc-shaped bent portions 11i that are convex downward are formed in advance by bending at both end sides, as in the fifth embodiment. There is.

In this structure, the guide shaft portion 11g of the conductor wire 11 is inserted into the locking hole 52 of the printed circuit board 50, and the locking return portion 11h at the lower end is caught on the opening edge of the locking hole 52. Be locked. This allows the tape wire 1
Since 0 is fixed to the printed circuit board 50, the arcuate bent portion 11i of the conductive wire 11 comes into contact with the contact portion 51 of the printed circuit board 50 with a contact pressure necessary for electrical connection. Even in this case, the same effect as that of the fifth embodiment can be obtained, and the tape wire 10 can be formed by using the conductor wire 11.
Since it can be fixed to the printed circuit board 50, there is an advantage that the structure is further simplified.

<Seventh Embodiment> FIGS. 11 to 13 show a seventh embodiment of the present invention. This also shows an example of connection between two printed circuit boards 60 arranged side by side, and the tape electric wire 10 itself can be fixed to the printed circuit board 60.

A conductor pattern (not shown) is formed on the printed circuit board 60 by printed wiring means, and contact portions 61 are formed on the upper surface of the printed circuit board 60 near the edges thereof.

On the other hand, the tape electric wire 10 is also formed by integrating a plurality of conductor wires 11 with the holding tape 12, and the both ends of the conductor wire 11 are arc-shaped bent portions which are previously convexed by bending. 11 j is formed, and the holding tape 12 is provided with two locking protrusions 15 on one surface. The locking projection 15 is made of the same material as the holding tape 12 shown in FIG.
It is formed by fusing as shown in FIG.
As shown in FIG. 5, the material is bent by hot pressing.

To connect the printed circuit boards 60 with this structure, the tape electric wire 10 shown in FIG. 13 is press-fitted into the gap between the boards 60 from above. Then, as the tape electric wire 10 is laterally compressed, the locking projection 15 of the tape electric wire 10 penetrates through the lower surface of the printed circuit board 60 and is locked to the lower surface edge portion of the printed circuit board 60.

As a result, the arc-shaped bent portion 11i of the conductor wire strip 11 of the tape electric wire 10 becomes the contact portion 61 of the printed circuit board 60.
An electrical connection is made by pressing the wire against. Therefore, the connector function can be exerted without the need for the conventional connector, and only the bending process of forming the conductor wire strip 11 of the tape electric wire 10 into a required shape is sufficient, so that the total cost can be significantly reduced. You can

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the following, various modifications may be made without departing from the scope of the invention.

(1) Conductive wire strip 11 shown in the first embodiment
As shown in FIGS. 14 and 15, in the connection end portion 11b of the above, one or a plurality of protrusion portions 11k are formed on the linear connection end portion 11b for surely making contact with the printed circuit board 20 side. You may.

(2) Further, the connecting end portion 11b shown in the first embodiment may be bent in an arc shape as shown in FIG. 16, in which case the thickness dimension of the printed circuit board 20 is taken into consideration. The curvature may be determined so that the arc-shaped bent portion 11m surely contacts the edge portion of the printed circuit board 20.

(3) Further, the conductive wire is not limited to the phosphor bronze wire material having a round cross section as described above as long as it has the required mechanical characteristics (tensile strength is 400 N / mm 2 or more), and it is a tape shape. Or may be made of annealed copper. Further, it is not always necessary to arrange a plurality of conductive wires, but only one may be used.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tape electric wire.

FIG. 2 is a sectional view showing a tape electric wire.

FIG. 3 is a perspective view showing an electrical connection structure using the tape electric wire according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing an electric connection structure using the tape electric wire of the first embodiment.

FIG. 5 is a perspective view showing an electric connection structure using a tape electric wire according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing an electrical connection structure using a tape electric wire according to a third embodiment of the present invention.

FIG. 7 is a sectional view showing an electrical connection structure using the tape electric wire of the third embodiment.

FIG. 8 is a cross-sectional view showing an electrical connection structure using a tape electric wire according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view showing an electrical connection structure using a tape electric wire according to a fifth embodiment of the present invention.

FIG. 10 is a sectional view showing an electrical connection structure using a tape electric wire according to a sixth embodiment of the present invention.

FIG. 11 is a sectional view showing an electrical connection structure using a tape electric wire according to a seventh embodiment of the present invention.

FIG. 12 is a perspective view showing a tape wire in the process of being manufactured according to the seventh embodiment.

FIG. 13 is a perspective view showing a tape electric wire of a seventh embodiment.

FIG. 14 is a sectional view showing an electrical connection structure using a tape electric wire according to another embodiment of the present invention.

FIG. 15 is a sectional view showing an electrical connection structure using a tape electric wire of another embodiment.

FIG. 16 is a sectional view showing an electrical connection structure using a tape electric wire of another embodiment.

FIG. 17 is a perspective view showing an electrical connection structure using a conventional tape electric wire.

[Explanation of symbols]

 10 ... Tape electric wire 11 ... Conductive wire 12 ... Holding tape 20 ... Printed circuit board 23 ... Contact part

Claims (7)

[Claims] 1. An electrical connection structure for connecting between electric circuits respectively formed on a pair of circuit boards, wherein conductive wires having spring characteristics are arranged so as to pass between the circuit boards, and An electrical connection structure between circuit boards, characterized in that the connection ends at both ends of the wire are brought into contact with the contact portions formed on the circuit board with a contact pressure based on the spring characteristics thereof. 2. A plurality of conductive wires are arranged at intervals along a predetermined direction, and a holding tape made of synthetic resin for holding the conductive wires in a parallel state is fixed to the conductive wire group. The electrical connection structure between circuit boards according to claim 1, wherein 3. The electrical connection structure between circuit boards according to claim 1, wherein the conductive wire is bent so that the connection ends at both ends thereof are arcuate. 4. The conductive wire has a tensile strength of 400 N / mm2.
The electrical connection structure between circuit boards according to any one of claims 1 to 3, which has the above mechanical characteristics. 5. The contact portions of both circuit boards are provided on the surfaces facing each other, and the distance between the connection ends of the conductive wires in the free state is set wider than the gap between the contact portions of each circuit board. The electrical connection structure between circuit boards according to claim 1, wherein the electrical connection structure is provided. 6. The contact portions of both circuit boards are formed on surfaces opposite to each other, and the distance between the connection ends of the conductive wires in the free state is larger than the distance between the contact portions of each circuit board. The electrical connection structure between circuit boards according to any one of claims 1 to 4, wherein the electrical connection structure is set to be narrow. 7. The two circuit boards are arranged side by side on the same plane with a predetermined gap, and contact portions are formed on the surfaces in the same direction, respectively, and the holding tape is locked to the circuit board. The electrical connection structure between circuit boards according to any one of claims 2 to 4, wherein a connection end portion of the conductive wire is in contact with a contact portion of the circuit board.