JPS6231969A - Connection mechanism for flexible flat cable - 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 Field of the Invention The present invention relates to a connection mechanism for parallel conductors in a flexible flat cable.

Prior art and its problems Conventionally, when connecting a flexible flat cable with parallel conductors, the cable is bent and the contact piece is pressed against the conductor portion exposed on the exception surface to obtain a concentrated pressure contact. As a means to maintain the curve and resist pressure, a pad made 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, A single-stage connection is provided in which the cable is bent and a contact piece is pressed directly into contact with the parallel conductor exposed at the bend.

However, in the former case, compressive force is applied to the elastic pad,
It attempts to maintain contact with its repulsive force, but
This has the disadvantage that the compression state of the surface of the elastic pad varies, resulting in variation in the contact pressure with the contact piece, making it impossible to obtain homogeneous and highly reliable contact, and making the mechanism complicated.

In addition, the latter attempts to utilize the elasticity of the flat cable itself, but flat cables are originally designed to have increased flexibility and avoid bending. The method of directly contacting the conductor with pressure has the drawback that it is too soft, it is difficult to obtain satisfactory rebound resilience, and proper pressure contact cannot be obtained.

To implement the same conventional technology in a flat cable,
This involves impracticality, such as having to select an elastic material capable of plastic deformation and having a considerable wall thickness as the parallel conductor, and specially manufacturing the cable.

OBJECTS OF THE INVENTION The present invention has made it possible to obtain the bending and appropriate rebound elasticity necessary for pressurized contact, regardless of the flexibility of the flat cable, without having to deal with unstable elements such as elastic pads. , provides a connection mechanism for a flexible flat cable in which the same characteristics are imparted to the cable itself, allowing highly reliable contact to be obtained.

Structure of the Invention The present invention has been made to achieve the above object,
As will be 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, and the shape-retaining action of the conductive piece provides the necessary pressure contact. It is constructed to provide bending and rebound resilience.

Embodiments of the Invention Below, embodiments of the present invention will be described with reference to FIGS. 1 to 5.

In each figure, 2 indicates a flat cable, and 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.

112. Paste the conductive piece 2C on the exposed surface of the parallel conductor 2a'. The laminated conductive piece 2C preferably uses parallel conductors and approximately 11 flat strips as shown. Also, depending on the implementation, a semicylindrical cross section or a round wire rod may be used.

-1- 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. .

-1 The curved part 2d as shown in the drawing is made by bending the two bonded parts.
form. The curved portion 2d is formed by pasting flat conductive pieces 2C together and then bending them together with the cable, or
Alternatively, the conductive piece 2C is bent in advance, and the parallel conductor 2a' of the flat cable is placed along the curved part.
Paste and form.

The laminated conductive piece 2C has a portion 2e forming the curved portion 2d in the center, and seat pieces 2f continuous to both ends of the curved portion 2e, and the seat pieces 2f are connected to the curved portion of the parallel conductor 2a'. 2
Attach both ends of d.

Figure wIJ5 shows an example of the latter production, as shown in the figure.
A parallel conductor 2a' having a curved part 2e whose central part is pre-curved and seat pieces 2f at both ends thereof, and each seat piece 2f connected by a connecting piece 2g via a cut and folded part 2c', etc. A flat cable 2 is prepared in which multiple conductive pieces 2C having a pitch are prepared, and a low temperature soluble metal layer 2a'' is formed on the surface of parallel conductors 2a'.

The multiple conductive piece 2C is made of a beryllium copper alloy, is formed by pressing a flat plate thereof, is heat-treated to give elasticity, and has a contact member (for example, gold) on the contact surface (top surface of the curved part).
to be plated.

Then, the above-mentioned multiple conductive pieces 2C and flat cable 2 are press-stamped with a female die 4 having a curved part 4a and a male die 5 having a matching curved part 5b to form the curved part 2d. 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 2a' are laminated together, that is, the curved part 2e of each conductive piece 2C and The seat piece 2f is integrally attached to the surface of each parallel conductor 2a'.

The low temperature soluble metal layer 2a'' is the laminated conductive piece 2c.
It is formed only in the area corresponding to the curve forming piece 2e and its seat piece 2f, and the connecting piece 2g is in a non-pasted state.

Cut the connecting piece 2g in the non-attached state and fold the folded part 2c'
The electrically conductive pieces 2C are then individually attached to each parallel conductor 2a'.

As shown in FIG. 2, the flat cable 2 configured as described above is introduced into the cable introduction hole 3a of the connector housing 3, and the connected body 1 is introduced from one end of the introduction hole 3a to bend the curved portion 2d. At the same time, the push-in piece 2b is pushed from the other end of the introduction hole 3a to the bent side of the curved portion 2d, and as shown in FIG. l: The curved part 2d of the flat cable 2 described in 1- is pinched between the pushed-in piece 2b and the object to be connected l, and each laminated conductive piece 2C is connected at the top surface of the curved part 2d by its repulsive elasticity. Pressure is brought into contact with each contact piece 1' of the body 1 at once.

! - The surface of the pushing piece 2b that abuts against the introduction hole inner wall surface 3a' is an inclined surface, and the inner wall surface 3a' is an inclined surface having a taper angle that is in tune with this, and the pushing piece 2b
As the pushing progresses, a wedge effect is created to gradually narrow the distance between the push-in piece 2b and the object 1 to be connected, thereby achieving the pressurized contact.

- 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 flat cable 2 formed as described above and the push-in piece 2b constitute a male connector mechanism.

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

That is, as shown in FIG.
b'' to combine with the cable.

As a result, as shown in FIGS. 2 and 3, the push-in part 2
When the curved portion 2d is crushed against the elasticity of the curved portion 2d due to the pressing force caused by the curved portion b, sliding occurs on the free contact surface 21 according to the amount of elongation, 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.

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 bending exception surface to obtain concentrated pressure contact. All you have to do is add a matching conductive piece.

It is possible to provide a flat cable connection mechanism that forms a preferable contact form, eliminates the poor pressurization that occurs when pressurizing the conductor of a flexible flat cable directly, and eliminates pressure rings and complicated structures such as those that involve intervening elastic pads. To achieve the above-mentioned highly reliable pressurized contact without causing damage.

[Brief explanation of the drawing]

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.
The figure is a cross-sectional view illustrating the connection process, Figure 4 is an exploded perspective view of the flexible flat cable and the push-in piece, and Figure 5 is a manufacturing example of combining the flexible flat cable and the laminated conductive piece. FIG. l... Connected object, 1'... Contacted piece, 2... Flexible flat cable, 2a... Insulating sheet, 2a'.
...Parallel conductor, 2C...Laminated conductive piece, 2d...
curved part. Procedural amendment (method) Japanese Patent Application No. 170358-170358 dated November 7, 1985 2 Name of the invention Connection mechanism in flexible flat cable 3 Relationship with the case of the person making the amendment Name of patent applicant Yama-Denki Industrial Co., Ltd. 4 Agent Address: 144 5 Date of amendment order Voluntary action 6 Drawing subject to amendment 7 Contents of amendment

Claims (1)

[Claims] 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 The rigidity of the conductive piece holds the bending
A connection mechanism for a flexible flat cable, characterized in that the contact piece is brought into pressure contact with the surface of the conductive piece.