JPS60254077A - Wire connector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a wiring connection device for transmitting electrical signals and the like.

BACKGROUND ART FIG. 1 shows a perspective view of a conventional liquid crystal display device l before assembly. The liquid crystal display device 1 includes a display body 2 made of a transparent substrate, liquid crystal, etc., a substrate 3 on which a circuit for driving the display body 2 is configured, and a wiring connection device for connecting the display body 2 and the substrate 3. and a connecting member 4.

FIG. 2 is a sectional view of the liquid crystal display device 1 of FIG. 1 in a mounted state. A circuit element 5 such as a large scale integrated circuit (LSI), for example, is disposed on the substrate 3 in order to drive the display body 2 . In such a liquid crystal display device 1, especially a dot matrix drive type liquid crystal display device,
There are demands for an increase in the size of the display body 2, an increase in the number of terminals for inputting and outputting electrical signals, and a higher density of the input terminals.

Along with this, the connection methods between the display body 2 and the connection member 4 and between the board 3 and the connection member 4 have changed, such as the use of so-called rubber connectors in which a conductor is disposed inside the rubber, and the use of soldered lead wires. There has been a shift from pasting methods to so-called heat-sealing methods using thermal fusion. Furthermore, there is a demand for miniaturization of parts other than the display body 2 shown in FIG. 1 as much as possible.

Furthermore, when actually mounting the liquid crystal display device 1, the connecting member 4 is bent into a substantially U-shape as shown in FIG. 2, and the liquid crystal display device @1 is stored in a storage body (not shown). be done. At this time, the connection between the display body 2 and the connection member 4 and the connection between the substrate 4 and the connection member 4 are made by the heat sealing method described above. FIG. 3 shows the forces acting on each part of the connecting member 4 bent as shown in FIG.

FIG. 3 is an enlarged partial view of the right side of FIG. Connection member 4
As mentioned above, it is roughly U-shaped, and the radius of curvature of the central part of the 7 is r. At this time, near the center of the connecting member 4, a tensile stress f1 acts on the radially outward surface.
decrease. A shrinkage stress f2 acts on the radially inner surface. In addition, near the outer (right side in FIG. 2) end 8 of the connection area 7 between the display body 2 and the connection member 4, the connection member 4 and the display body
The same stress f3 on the surfaces touching each other is the third
It works in the vertical direction of the figure. Further, at the outer end of the connecting region 7 of the front floor, a contraction 1-b force f4 is acting on a portion 9 of the radially inner surface of the connecting member 4 facing the front end 7.

Near the outer (right side in FIG. 3) end 11 of the connection region 10 between the connection member 4 and the substrate 3, a stress f5 is exerted between the surfaces of the connection member 4 and the substrate 3 that are in contact with each other. ing. A convergence stress f6 is acting on a portion 12 of the radially inner surface of the connecting member 4 facing the outer end vicinity 11 of the aforementioned connecting region 1o.

At this time, if the stress f3 exceeds the limit j of the fusion strength between the connecting member 4 and the display body 2, a peeling phenomenon occurs in the connecting region 7. In addition, the stress f5 is between the connecting member 4 and the substrate 3.
If the strength of the fusion bond between the two ends exceeds the limit, a peeling phenomenon will occur. Therefore, mechanical contact p
7 -4 due to a decrease in strength and poor electrical connections, such as wire breaks and electrical shorts with adjacent terminals.

Further, the range of the pupil with the radius of curvature r that does not cause the peeling phenomenon is determined from the physical properties of the connecting member 4 and the like.

From the above points, in order to make the liquid crystal display device @1 shown in FIGS. 1 and 2 smaller as a whole, there was a problem that the connecting member 4 had to be given as much flexibility as possible. .

Figure 4 shows Ryu's prior art. The connecting member 4 is used by being bent as shown in the fourth figure. At this time, the forces acting on each part of the connecting member 4, the forces acting between the connecting member 4 and the display body 2, the forces acting on the connecting member 4 and the substrate 3, etc. are as follows:
Things like the 7th direction change. However, the same problem is presented as the connecting member 4 must be made as flexible as possible.

OBJECTIVE The purpose of the present invention is to solve the above-mentioned technical problems and to provide an improved wiring connection device that can maintain a stable curved surface with the smallest possible radius of curvature with significantly less force. It is to provide.

Embodiment FIG. 5 is a perspective view of a liquid crystal display device 2° according to an embodiment of the present invention, FIG. 6 is a sectional view taken from the section line ■-■ in FIG. 5, and FIG. FIG. 6 is an enlarged view of a portion of FIG. 6; The liquid crystal display device 20 basically includes a display body 21, a substrate 22, and a connection member 23 serving as a wiring connection device that connects the display body 2o and the substrate 22. A circuit element (for example, a large-scale integrated circuit) 24 for driving the display body 21 is arranged on the substrate 22 .

The connecting member 23 and the display body 21 are fused and connected by a heat sealing method using a polystyrene-based or butadiene-based fusion agent. Here, a connection method using a heat seal method will be explained. Connecting portion +': The above-mentioned fusion agent is applied to the connection region 26 where the II 23 and the display body 21 are fused and connected to each other. Next, the connecting part 1 is heated and fused using a fusing agent.
23 and the display body 21 are bonded together. A protective film 30, 31, which will be described later, is provided at the connection area 23 corresponding to the connection area 26.
is peeled off and fused. Furthermore, the connection between the connecting member 23 and the substrate 22 is also made by the heat sealing method.
The protective film on the portion of the connection member 23 corresponding to the connection region 27 has also been peeled off.

The connecting portion vi23 has a three-layer so-called sandwich inch structure as shown in FIG. Here, FIG. 7 is a plan view of a portion of the conductive layer 32, which will be described later, and is not a cross-sectional view.
Hatching is added for convenience to distinguish between a conductor 37 and an electric insulator 38, which will be described later.

The connecting portion side 23 is formed as shown in FIG. 8, and includes a protective film 30, 31 having electrical insulation properties, made of polyimide resin, for example, and a conductive layer 32, made of copper Cu, for example. Protective film 3 before forming connection member 23
0.31 and the conductor layer 32 are rollers 33a, 33b, 33
A-ra 34a l'34
bi'35a'.

35b; gradually crimped by 36a and 36b. At this time, a novolac resin is used as an adhesive, and the protective films 30 and 31 and the conductive layer 32 are integrally formed.

On both surfaces of the connecting member 23 formed in this way, @
A large number of wavy grooves are formed parallel to the conveying direction indicated by arrow A in FIG. 8 and having the same spacing.

After that, when further steps such as heating are performed, the connecting member 23 is compressed only in a direction perpendicular to the paper plane of FIG. 8, and a connecting member 23 having a large number of wavy grooves as shown in FIG. 7 is formed. At this time, the thickness +L1 of the protective films 30 and 31 is 36 μm, and the thickness F2 of the conductor layer 32 is 18 μm. Further, the conductor layer 32 has a conductor 37 such as Cu and an electric insulator 38 such as polyimide resin, each having a width D3 and a width D4 of 1.
00 pm and are regularly arranged.

The depth W of the aforementioned wavy grooves 39 on the outer surface of the protective film 30.31 is formed to be 2 μm. The width α of the so-called peak portions 40 of the wavy groove 39 and the width β of the so-called trough portions 41 are each 40 μm.

The connecting member 23 having the wavy grooves 39 formed as described above is actually used by being bent so that its cross section has a roughly U-shape as shown in the sixth figure. Connection member 23
Let R be the radius of curvature near the middle part of . At this time, in the vicinity of the center of the connecting member 23, a tensile stress F1 is acting on the radially outer surface.A contraction stress F2 is acting on the radially inner surface near the center.

Further, near the outer (right side in FIG. 6) end 45 of the connection area 26 between the display body 21 and the connection member 23, stress F3 is generated between the display body 21 and the connection portion H23 in the vertical direction in FIG. working in Shrinkage stress F4 is acting on the radially inner surface of the connecting member 23 facing the vicinity of the outer end 45.

Outside the connection area 27 between the board 22 and the connection member 23 (sixth
On the right side of the figure) near the end 46, the board 22 and the connecting member 23
Meanwhile, a stress F5 is acting in the vertical direction in FIG. a connecting member 23 facing the outer end 46 of the connecting region 27;
A collection stress F6 is acting on the radially outer table (2) of .

In this way, when bending the connecting part 23 as shown in FIG. 6, the bending stress generated by the bending moment applied to the connecting member 23 causes a tensile stress F1 and a contraction force F2. F4. F6 occurs.

These forces Fl, F2. F4. Since the bending stress of F6 is dispersed by the wavy groove 39, when compared with the conventional example shown in the third figure, fl>Fl, F2>F2, F4>F4, F6>F6
Drops out the N staff. In other words, the bending rigidity of the connecting member 23 is reduced. However, the stress F4. The F6Vc function also satisfies the relational expressions F4>F4 and F6>F6.

By providing the wavy grooves 39 on both surfaces of the connecting member 23 in this manner, it is possible to provide the connecting member 23 with remarkable flexibility. Therefore, by comparing FIG. 3 and FIG. 5, results satisfying the formulas d>D and e>L are obtained. That is, the connecting portion 23 can be shortened, and the overall shape of the liquid crystal display device 20 can be made smaller.

Furthermore, since the flexibility of the connecting member 23 is improved, even if the connecting member 23 is bent and stretched during repair of the liquid crystal display device 20, for example, there is a low probability that peeling will occur in the bonding areas 26 and 27. could be significantly reduced.

In the above embodiment, the liquid crystal display device 20 was described, but the present invention is applicable to flat display devices having many terminals such as electro-luminescence (EL) and light emitting diodes (LED), or connection of printed wiring boards, etc. Broad〈Can be implemented.

Further, the wavy groove 39 is not limited to the rectangular stepped groove shape shown in FIG. 7, but may have a cross section having a sinusoidal waveform or the like.

Further, the thickness of the connecting member 23 is 200 μm or less, and the thickness of the protective film 30 is 200 μm or less.
, 31 may be 30 μm or more, the depth W of each wavy seedling 39 may be 2 μm to 20 μm, and the width α of the peak portion 40 and the width β of the valley portion 41 may be in the range of 30 μm to 200 μm, respectively. However, the depth W of the wavy groove 39 is 1 of the thickness of the connecting member 23.
/40 to 1/10, and the wavelength of the wavy groove 39, that is, the sum of the peak width α and the valley width β is 1 of the thickness of the connecting member 23.
It is preferable that the diameter is in the range of /10 to 2.

Effects According to the present invention as described above, the flat wiring connection device can be made extremely flexible by providing a plurality of unevenness, and therefore can be bent with much less force than the conventional technology. You can try to maintain it.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional liquid crystal display bag @1, Fig. 2 is a sectional view of the connecting member 4 shown in Fig. 1 in a bent state, Fig. 3 is an enlarged partial view of Fig. 2, and Fig. 4 is a cross-sectional view of the pond example in Figure 2,
FIG. 5 is a perspective view of an embodiment of the present invention, FIG. 6 is a sectional view taken along the section line Vl-Vl in FIG. 5, and FIG. 7 is an enlarged sectional view of the connecting member 23 in FIG. FIG. 8 is a plan view of a portion of the conductive layer 32, and FIG. 9 is a diagram showing a manufactured portion of the connecting member 23. 20... Liquid crystal display device, 21... Display body, 23...
・Connection member, 2-6.27...Connection area, 30.31
...protective film, 32...conductor layer, 39...wavy groove, 40...convex portion, 41...4th Department Agent Patent Attorney Takayoshi Nishi Part 1 Figure 1 F Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A wiring connection characterized in that a combustible conductor is integrally provided on a flexible base material, and a plurality of projections and depressions extending in a direction crossing the bending direction are formed on the surface of the flexible base material. Attachment @
.