JP2003143728A - Terminal connector for ultrathin multiscore cable, and terminal connection method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal connector for an ultrathin multicore cable which can connect even ultarthin line cores simply at narrow pitches and can simplify labor in manufacturing, and its terminal connection method. SOLUTION: In this terminal connector for an ultrathin multicore cable, where a plurality of pieces of ultrathin line cores 3 with their conductor lines 4 covered with insulators and bundled; as its terminal connection method, a plurality of lines of arrangement grooves 2 are formed in a base block 1; ultrathin line cores 3 are arranged and united in the several arrangement grooves 2 so that the plurality of pieces of ultrathin line cores 3 taken out of the terminal of the ultrathin multicore cable are positioned on the same plane; they are polished inclusive of the base block 1 so that the conductor lines 4 of the plurality of pieces of ultrathin line cores 3 are exposed in the longitudinal direction on the same plane, and a circuit pattern member 11, where a conductor circuit pattern 13 is formed on the surface, is fixed via an anisotropic conductive film 10 to the conductor exposed face of the base block 1 in such a way that the face of the conductor circuit pattern 13 faces the conductor exposed face; and the conductor line 4 of the ultrathin line core 3 and the conductor circuit pattern 13 are electrically connected with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrafine multi-core cable for use in electric / electronic equipment and the like, and an ultrafine cable for connecting a terminal portion of a cable and a circuit pattern member such as a printed circuit board having a conductor circuit pattern on its surface. The present invention relates to a terminal connecting portion of a multi-core cable and a method of connecting the terminal.

[0002]

2. Description of the Related Art Conventionally, in order to connect a plurality of ultrafine wire cores taken out from an end portion of an ultrafine multi-core cable to a substrate on which a conductor circuit pattern is formed, each end portion of the ultrafine wire core is stepped. The conductor wire was exposed by peeling it off, and the end portions of the conductor wire were soldered on the conductor circuit patterns.

For example, when connecting the ends of an ultrafine multi-core cable in which a plurality of ultrafine coaxial cores are bundled to a substrate, as shown in FIG. 7, a plurality of ultrafine multicore cables (not shown) are connected to the ends. Take out the extra fine coaxial wire cores 61, peel off the respective end portions, and remove the center conductor 6 from the jacket layer 65.
2, the insulating layer 63 and the outer conductor layer 64 are exposed, and the central conductor 62 thereof is formed on the signal conductor circuit pattern portion 71 of the substrate 70.
The outer conductor layers 64 were soldered to the ground conductor circuit pattern portions 72 of the substrate 70, respectively.

[0004]

However, with the recent miniaturization and higher performance of electric and electronic devices, it has been desired that the ultra-fine multi-core cables used therefor be further thinned and multi-core. In the coaxial core, the outer diameter of 0.2 mm or less is emerging at present.

Further, the miniaturization of the terminal connection portion of the ultra-fine multi-core cable, which is the connection portion between the terminal portion of the ultra-fine multi-core cable and the circuit pattern member having the conductor circuit pattern on the surface, is also progressing.

[0006] In such a situation that the outer diameter of the ultrafine wire cores to be connected is reduced and the pitch between the ultrafine wire cores must be connected at a narrow pitch, the conventional connecting method Since the terminals are connected one by one, it takes a lot of time and labor to manufacture the terminal connecting portion, the number of man-hours is increased, and the cost is greatly increased.

[0007] Therefore, an object of the present invention is to solve the above-mentioned problems, to connect even a fine wire core easily at a narrow pitch, and to simplify the manufacturing work. It is to provide the terminal connection method.

[0008]

In order to solve the above-mentioned problems, the present invention relates to a terminal connecting portion of an ultrafine multi-core cable in which a plurality of ultrafine wire cores in which a conductor wire is provided with an insulating coating are bundled. It has a base on which an array groove of a book is formed, and in each array groove, a plurality of ultrafine wire cores taken out from the terminal portion of the ultrafine multi-core cable are arranged, respectively, and fixedly integrated, A plurality of ultrafine wire cores in the array groove are arranged on the same plane, and conductor conductors of the plurality of ultrafine wire cores in the array groove are exposed on the same plane along the longitudinal direction. A surface is formed on the base, a circuit pattern member is fixed to the conductor exposed surface via an anisotropic conductive film, and a conductor circuit pattern formed on the surface of the circuit pattern member, The conductor wire of the ultrafine wire core of the book is electrically connected by using the anisotropic conductive film. It is those that are connected.

The ultrafine wire core includes a center conductor, an insulator layer provided on the outer periphery of the center conductor, an outer conductor layer provided on the outer periphery of the insulator layer, and an outer periphery of the outer conductor layer. An outer diameter of 0.5 mm or less having an outer diameter of a jacket layer, and a plurality of fine coaxial wires are arranged in the arrangement groove at a pitch of 0.3 to 0.7 mm. Is also good.

The pitch between conductors of the conductor circuit pattern at the end of the circuit pattern member that is not connected to the base is narrower than the pitch between a plurality of ultrafine wire cores in the array groove. It is preferably formed as follows.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present embodiment, the case where the ultra-fine coaxial wire core 3 is used as the ultra-fine wire core will be described.

As shown in FIG. 4, the ultra-fine coaxial wire core 3 includes a central conductor 4 made of a single wire, an insulator layer 5 covering the outer periphery of the central conductor 4, and an outer periphery of the insulator layer 5. An outer conductor layer 6 composed of a large number of conductors, and a jacket layer 7 covering the outer periphery of the outer conductor layer 6,
The outer diameter is 0.2 mm.

FIG. 1 is a perspective view of a terminal connecting portion of an ultrafine multi-core cable according to the present invention.

As shown in FIG. 1, the terminal connecting portion according to the present invention accommodates the micro coaxial wire core 3 shown in FIG. 4 and arranges the terminal portions of the central conductor 4 on the same plane at a predetermined pitch. Base 1 on which the array groove 2 is formed, and each central conductor 4
And a circuit pattern member 11 on which a conductor circuit pattern is formed to be connected to the end portion of the base pattern 1 and the circuit pattern member 11 are anisotropic conductive materials having conductivity only in the thickness direction. Membrane (AFC: Anisotropic Conductive Fil)
m) 10 joined together.

As shown in FIG. 3, the circuit pattern member 11
Has a circuit pattern made of a conductive metal such as copper formed on the surface of an insulating substrate 12. The circuit pattern has a linear signal conductor circuit pattern portion 13 connected to the central conductor and an outer conductor. It has a ground conductor circuit pattern portion 14 connected to the layer and formed on both sides of the signal conductor circuit pattern portion 13 at appropriate intervals.

In the signal conductor circuit pattern portion 13, one end portion is formed with a pitch of 0.5 mm in accordance with the pitch between the center conductors of the ultra-fine coaxial wires housed in the array groove, and the other end portion is formed. It is formed with a pitch of 0.3 mm so as to be narrower than the pitch between the central conductors of 0.5 mm.

The ground conductor circuit pattern portion 14 is formed in a comb shape in which one end portion is meshed with the three signal conductor circuit pattern portions 13 and the other end portions are connected to each other. Ground conductor circuit pattern 14
And a part of the ground conductor circuit pattern portion 14 on the extension line of the signal conductor circuit pattern portion 13 (a portion indicated by a dotted line) is an insulating film so that the central conductor 4 of the ultra-fine coaxial wire core 3 is not electrically connected. It is covered with 15.

Further, as shown in FIG. 2, the base 1 is made of a material such as plastic or metal for easy processing, and is made of hard plastic such as epoxy resin.
Zircoa and stainless steel are used.

The array groove 2 is formed in a concave shape (rectangular shape) in cross section, and the end portion of the ultrafine coaxial wire core is halved while being housed in the array groove 2 to provide a flat conductor exposed surface. 9 is formed.

The anisotropic conductive film 10 has conductive particles 16 for obtaining electrical connection in the vertical direction (thickness direction) in a resin insulating film (binder) 17 for bonding members to be mounted together.
Is mixed in. The material of the conductive particles 16 is silver,
Examples thereof include metal particles having good conductivity such as gold, copper, aluminum, nickel and solder, and resin particles having a metal layer provided on the surface by a method such as plating.

The resin insulating film (binder) 17 of the anisotropic conductive film 10 is made of a resin component having a good adhesion to the base 1 and the substrate 12. Examples of this resin component include resins such as thermosetting epoxy, urethane, and silicone.
Of these, thermosetting epoxy resins having amines or acid anhydrides as curing agents are preferable.

Since this anisotropic conductive film 10 is attached to the base 1 before being heat-cured, it is desirable that the anisotropic conductive film 10 has appropriate tackiness.

With this anisotropic conductive film 10, the central conductor 4 and the outer conductive layer 6 are respectively formed.
It is electrically connected to the signal conductor circuit pattern 13 and the ground conductor circuit pattern 14 of the circuit pattern member 11 described above through the conductive particles 16 contained in 0.

Next, a method of manufacturing the terminal connecting portion of the ultra-fine multi-core cable according to the present invention will be described together with its operation.

First, in order to align a plurality of ultrafine wire cores to be connected, as shown in FIGS. 5A and 6A, a rectangular parallelepiped base 1 is prepared, and FIG. ), FIG. 6
As shown in (b), three array grooves 2 are formed in the base 1.

As a method of forming the array grooves 2, there are a method of forming by etching, a method of forming by using sandblast and the like. If the base 1 is plastic,
There is a method of injecting a plastic resin into a mold in which the mold of the base 1 and the mold of the array groove 2 are both formed, and curing the resin to form the base 1 at the same time.

Then, the three ultra-fine coaxial wire cores 3 are taken out from the end portion of the ultra-fine multi-core cable (not shown), and as shown in FIG.
As shown in (c) and FIG. 6 (c), the ultrafine coaxial wire cores 3 are arranged in the respective alignment grooves 2 so that the three ultrafine coaxial wire cores 3 are located on the same plane, and are bonded. Fixed and integrated with the agent 8.

As a method for fixing and integrating the ultra-fine coaxial fiber cores 3 in the array groove 2, for example, fixing using an adhesive 8 such as a hot melt adhesive or an ultraviolet curable resin can be considered.

Then, as shown in FIGS. 5 (d) and 6 (d), the central conductors 4 and the outer conductor layers 6 of the three micro coaxial cores 3 are exposed on the same plane along the longitudinal direction. like,
The micro coaxial core 3 is ground together with the base 1 to form a conductor exposed surface 9 on the base 1.

At this time, the surface of the base 1 on which the array grooves 2 are formed is not entirely ground, but only the portion for fixing the circuit pattern member is partially ground, and the portion for holding the ultrafine coaxial fiber core 3 is used. As a result, it is preferable to leave the end portion on the side where the micro coaxial wire core 3 is pulled out without polishing.

Finally, as shown in FIGS. 5E and 6E, the circuit pattern member 11 is fixed to the exposed conductor surface 9 of the base 1 with the anisotropic conductive film 10 sandwiched therebetween.

Specifically, the anisotropic conductive film 10 is attached to the exposed conductor surface 9 of the base 1, and the circuit pattern member 11 is fixed by thermocompression bonding.

At this time, the conductor circuit patterns 13 and 14 formed on the surface of the circuit pattern member 11 are fixed so as to face the conductor exposed surface 9.

As a result, the central conductor 4 and the outer conductor layer 6 of the micro coaxial wire core 3 and the conductor circuit patterns 13 and 14 are pressure-welded and electrically connected by the anisotropic conductive film 10.

As described above, according to the present invention, since a plurality of ultrafine coaxial wire cores 3 are connected together, connection can be easily performed even at a narrow pitch. As a result, the cost of manufacturing the terminal connecting portion can be reduced.

Further, since the connecting portion between the central conductor 4 and the signal conductor circuit pattern portion 13 is protected by being sandwiched between the base 1 and the substrate 12, a stable connection can be achieved.

In the present embodiment, the terminal connecting portion to which the three ultra-fine coaxial wire cores 3 are connected has been described, but it goes without saying that the number may be further increased.

The circuit pattern member 11 may be a printed circuit board on which electronic parts are mounted.

The cross-sectional shape of the array groove 2 is V-shaped or U-shaped.
You may form in a character shape.

[0041]

In summary, according to the present invention, even a very fine wire core can be easily connected at a narrow pitch, and the labor of manufacturing can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view showing a terminal connecting portion of an ultrafine multi-core cable according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a terminal connecting portion of FIG.

FIG. 3 is a plan view of a circuit pattern member that constitutes the present invention.

FIG. 4 is a sectional view of a micro coaxial wire core connected according to the present invention.

5 (a) to 5 (e) are perspective views showing an intermediate body of the terminal connecting portion of FIG.

FIG. 6 (a) is A- of the intermediate body of the terminal connecting portion of FIG. 5 (a).
Sectional drawing of the A line arrow, (b) is a BB sectional sectional view of the terminal connection part intermediate body of FIG.5 (b), (c) is C- of the terminal connection part intermediate body of FIG.5 (c). Sectional view taken along the line C, FIG. 5D is FIG.
5 is a sectional view taken along the line D-D of the terminal connection portion intermediate body of FIG. 5E, and FIG. 5E is a sectional view taken along the line EE line of the terminal connection portion intermediate body of FIG.

FIG. 7 is a diagram for explaining a method of connecting a terminal portion of a conventional ultra-fine multi-core cable and a substrate.

[Explanation of symbols]

1 base 2 array groove 3 Micro coaxial core 4 Center conductor (conductor wire) 5 Insulator layer 6 outer conductor layer 7 jacket layers 10 Anisotropic conductive film 11 Circuit pattern member 13 Signal conductor circuit pattern part (conductor circuit pattern)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02G 15/08 H01R 9/09 Z (72) Inventor Masafumi Kunii 4-10-1 Kawajiri-cho, Hitachi-shi, Ibaraki F-term in Hitachi Cable Finetech Co., Ltd.

Claims (5)

[Claims] 1. A terminal portion of the conductor wire of an ultrafine multicore cable in which a plurality of ultrafine wire cores having an insulating coating applied to the conductor wire are bundled, and a plurality of signal conductor circuit pattern portions of a conductor circuit pattern, respectively. In the terminal connection portion of the connected ultra-fine multi-core cable, a base having an array groove for arranging the terminal portions of the conductor wires on the same plane at a predetermined interval, and one end portion of the signal conductor circuit pattern portion are A circuit pattern member that is arranged on the same plane at the above intervals, and a terminal portion of the conductor wire and one end portion of the signal conductor circuit pattern portion have conductivity only in the thickness direction. A terminal connecting portion of an ultra-fine multi-core cable, which is joined by an anisotropic conductive film. 2. The ultrafine wire core includes a center conductor, an insulator layer coated on the outer circumference of the center conductor, and an outer conductor layer formed of a large number of conductor wires wound around the outer circumference of the insulator layer. A fine coaxial core having a jacket layer coated on the outer periphery of the outer conductor layer, wherein the circuit pattern member is connected to the outer conductor layer and is appropriately spaced on both sides of the signal conductor circuit pattern portion. The terminal connecting portion of the ultrafine multicore cable according to claim 1, wherein a ground conductor circuit pattern portion is formed. 3. The ultrafine multicore cable according to claim 1, wherein the ultrafine wire core has an outer diameter of 0.5 mm or less, and the array grooves are formed at intervals of 0.3 to 0.7 mm. Terminal connection part. 4. The circuit pattern member is formed such that a distance between the other ends of the signal conductor circuit pattern portions is smaller than a distance between conductor lines arranged in the arrangement groove.
4. The terminal connecting portion of the ultrafine multi-core cable described in any one of 1 to 3. 5. An end portion of the conductor wire of an ultrafine multicore cable in which a plurality of ultrafine wire cores having an insulating coating applied to the conductor wire are bundled, and a plurality of signal conductor circuit pattern portions of a conductor circuit pattern, respectively. In the terminal connecting method of the ultrafine multi-core cable to be connected, the terminal portions of the conductor wires are accommodated and fixed in the array groove of the base in which the array grooves are arranged on the same plane at predetermined intervals, and the conductor is After exposing the end portion of the wire by polishing together with the base, one end portion of the signal conductor circuit pattern portion is formed by arranging on the same plane on the same plane, and An ultrafine multi-core, characterized in that an anisotropic conductive film having conductivity only in the thickness direction is sandwiched and bonded to the base so that the terminal part and one end of the signal conductor circuit pattern part are overlapped with each other. How to connect the cable end.