JPH027151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a connection mechanism for parallel conductors in a flexible flat cable.

Conventional technology and its problems Conventionally, when connecting a flexible flat cable with parallel conductors, the cable is bent and a piece to be contacted is pressed against the conductor portion exposed on the outer surface of the bent side, and concentrated pressure contact is made. As a means of maintaining the curve and resisting pressure, a pad of elastic rubber or the like is placed on the inner surface of the curve, or as shown in Japanese Utility Model Application Publication No. 84077/1983. Furthermore, there is provided a connection means, etc., which bends a cable and pressurizes and directly contacts a contact piece to a parallel conductor exposed at the curved portion.

However, in the former case, a compressive force is applied to the elastic pad and the repulsive force is used to maintain contact, but this causes variations in the compressed state of the surface of the elastic pad, resulting in variations in the contact pressure with the contacted piece. This method has disadvantages in that it is difficult to obtain homogeneous and highly reliable contact, and the mechanism is complicated.

In addition, in the latter case, the elasticity of the flat cable itself is used, but originally flat cables were designed to have high flexibility and avoid bending. The method of directly pressurizing parallel conductors is too weak, making it difficult to obtain satisfactory rebound resilience, and has the disadvantage that proper pressurizing contact cannot be obtained.

In order to implement the same conventional technology in a flat cable, it is unrealistic that an elastic material that can be plastically deformed and has a considerable wall thickness must be selected as a parallel conductor and the cable must be specially manufactured. .

OBJECT OF THE INVENTION The present invention is designed to provide a flat cable of any flexibility with the necessary bending and rebound resilience necessary for pressurized contact without having to deal with unstable elements such as elastic pads. The present invention provides a connection mechanism for a flexible flat cable in which the same characteristics are imparted to the cable itself, thereby making it possible to obtain highly reliable contact.

Composition of the Invention The present invention has been made to achieve the above object, and as described later, another conductive piece is superimposed on the surface of the parallel conductor possessed by the flat cable itself to form a bonded part. The structure is such that the shape-retaining action of the conductive piece provides the bending and rebound resilience necessary for the pressurized contact.

Embodiments of the Invention Examples of the present invention will be described below with reference to FIGS. 1 to 5.

In each figure, 2 indicates a flat cable. The flat cable 2 has a plurality of parallel conductors 2a'. The parallel conductor 2a' may be in close contact with the surface of the flexible insulating sheet 2a and extend with its entire length exposed, or may extend within the flexible insulating sheet and be partially exposed.

The conductive piece 2c is attached to the exposed surface of the parallel conductor 2a'. The laminated conductive piece 2c is preferably a flat strip having approximately the same width as the parallel conductor as shown in the figure.
Also, depending on the implementation, a semicylindrical cross-section or a round wire rod may be used.

The laminated conductive piece 2c is laminated to the parallel conductor 2a' using a low-temperature soluble metal as a medium, or the laminated conductive piece 2c and the parallel conductor 2a' are fused by melting the base materials to form a laminated body.

The above bonded portion is bent to form a curved portion 2d as shown in the figure. The curved portion 2d is formed by pasting flat conductive pieces 2c together and then bending them together with the cable, or by bending the conductive pieces 2c in advance and then bending the flat conductive pieces 2c along the curved pieces. It is formed by pasting the parallel conductors 2a' of the cable.

The pasted conductive piece 2c has the above-mentioned curved part 2d in the center.
and a seat piece 2f continuous to both ends of the curve forming piece 2e, and the seat piece 2f is attached to both ends of the curved part 2d of the parallel conductor 2a'.

FIG. 5 shows an example of the latter manufacture. As shown in the figure, it has a curved part 2e whose central part is curved in advance and seat pieces 2f at both ends thereof, and each seat piece 2f is connected by a connecting piece 2g via a cut and folded part 2c'. A flat cable 2 is prepared in which parallel conductors 2a' and multiple conductive pieces 2c at equal pitches are prepared, and a low temperature soluble metal layer 2a'' is formed on the surface of the parallel conductors 2a'.

The multiple conductive pieces 2c are made of beryllium copper alloy, are formed by pressing a flat plate thereof, are heat-treated to impart elasticity, and are plated with a contact member (for example, gold) on the contact surface (top surface of the curved part). .

Then, the multiple conductive pieces 2c and the flat cable 2 are press-stamped with a female mold 4 having a curved part 4a and a male mold 5 having a matching curved part 5b, and the curved part 2d is formed. At the same time, heat is applied to melt the low temperature soluble metal layer 2a'', and through this, each conductive piece 2c and each parallel conductor 2
Perform batch bonding with a′. That is, the curved portion 2e of each conductive piece 2c and its seat piece 2f are integrally attached to the surface of each parallel conductor 2a'.

The low-temperature soluble metal layer 2a'' is formed only on the surface area corresponding to the curved portion 2e of the laminated conductive piece 2c and its seat piece 2f, and the connecting piece 2g is not laminated.

The unattached connecting piece 2g is cut and broken off at the folding portion 2c', thereby completing a state in which each conductive piece 2c is independently attached to each parallel conductor 2a'.

The flat cable 2 configured as described above is
As shown in the figure, the cable is introduced into the cable introduction hole 3a of the connector housing 3, and the connected object 1 is further introduced from one end of the introduction hole 3a to be positioned on the bending side of the curved portion 2d, and the other end of the introduction hole 3a is inserted. Push the push piece 2b from the end to the bent side of the curved part 2d, and as shown in FIG. 3, the inner wall 3 of the introduction hole 3a
The curved portion 2d of the flat cable 2 is compressed between the push-in piece 2b and the object to be connected 1 under the restrictions of a' and 3a'', and the repulsive elasticity causes each of the curved portions 2d to be pasted together on the top surface. The conductive pieces 2c are brought into contact with each contact piece 1' of the object 1 under pressure.

The surface of the pusher piece 2b that comes into contact with the inner wall surface 3a' of the introduction hole is an inclined surface, and the inner wall surface 3a' is an inclined surface having a taper angle that is in tune with the inner wall surface 3a' of the introduction hole. Accordingly, a wedge effect is caused between the pushing piece 2b and the connected body 1.
The above-mentioned pressurized contact is obtained by gradually narrowing the distance between the two.

The push-in piece 2b is preferably attached integrally to the bending side surface of the flat cable 2, that is, the surface of the insulating sheet 2a, as shown in FIG.
The curved portion 2d is positioned at the attached portion, and the flat cable 2 and push-in piece 2 formed as described above are attached.
b constitutes an integrated male connector mechanism.

In this case, it is more preferable that the push-in piece 2b adheres to the insulating sheet 2a only at one end of the curved portion 2d (adhesive surface 2h), and has the other end as a mere contact surface with the insulating sheet 2a (a loose contact surface). 2
i) Slidable.

That is, as shown in FIG.
Adhesive 2b'' is applied only to the surface corresponding to one end of the curved part of the flat cable, in order to combine it with the cable.

As a result, as shown in FIGS. 2 and 3, when the curved portion 2d is crushed against its elasticity under the pressure of the push-in portion 2b, the free contact surface 2i is Sliding occurs and this is absorbed.

Effects of the Invention As explained above, the present invention attaches another conductive piece to the parallel conductor of a flat cable to form a bent part necessary for pressurized contact. However, it is possible to construct a contact portion that has appropriate rigidity and elasticity while reliably imparting the bending tendency necessary for pressurized contact without having to deal with unstable elements such as elastic pads. Highly reliable pressurized contact can be achieved due to the rebound elasticity.

Accordingly, the present invention provides a connection mechanism for a flat cable in which the cable is bent and a contact piece is pressed against the conductor portion exposed on the outer surface of the bent side to obtain concentrated pressure contact. By simply adding the above-mentioned laminated conductive piece,
It is possible to provide a flat cable connection mechanism that forms a preferable contact form, eliminates pressure defects such as those caused by direct pressure contact with the conductor of a flexible flat cable, and eliminates pressure irregularities such as those caused by intervening elastic pads. To achieve the above-mentioned highly reliable pressurized contact without complicating the structure.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a connector mechanism using a connection mechanism according to an embodiment of the present invention in a state before connection, Figs. 2 and 3 are cross-sectional views of the same illustrating the connection process, and Fig. 4 5 is an exploded perspective view of a flexible flat cable and a push-in piece, and FIG. 5 is a perspective view showing an example of manufacturing a composite of a flexible flat cable and a laminated conductive piece. DESCRIPTION OF SYMBOLS 1... Connected object, 1'... Contacted piece, 2... Flexible flat cable, 2a... Insulating sheet, 2
a'...Parallel conductor, 2c...Laminated conductive piece, 2d
...Curved part.

Claims (1)

[Claims] 1. In a flat cable having a large number of parallel conductors, a conductive piece is pasted on the exposed surface of the parallel conductor, the pasted part is bent, and the conductive piece is arranged on the bent side surface, and A connection mechanism for a flexible flat cable, characterized in that the bending is maintained by the rigidity of the conductive piece, and the contact piece is pressed into contact with the surface of the conductive piece.