JPH0636620A - Flexible flat cable - Google Patents

Abstract

PURPOSE:To provide a flexible flat cable having the capability of reducing stress acting between each conductor separated with two insulation films, even when the relationship of terminal sections at both ends of the cable is positionally caused to change due to parallel displacement, turning, bending or the like, by providing a specific bellows structure at the insulation section of the cable. CONSTITUTION:This flexible flat cable is constituted of at least one straight angle type conductor 1 allowing electric current to flow, an insulation film 2 to insulate each conductor, and the conductor 1 from the outside, an insulation section 3 insulated with the film 2 thermally press-fitted in such a way as clamping the conductor 1, and a plurality of terminal sections 4 for soldering the conductor 1 to a plurality of separately positioned terminals such as an electrical circuit. Furthermore, the insulation section 3 is provided with a bellows structure 51 having a plurality of bending sections 6 with a straight bending direction relative to the axial direction of the conductor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible flat cable (hereinafter referred to as FFC), and more particularly to the structure of FFC.

[0002]

2. Description of the Related Art A conventional FFC will be described with reference to the drawings.

FIG. 5 is a structural diagram of a conventional FFC, FIG.
FIG. 5A is a perspective view of a conventional FFC, and FIG. 5B is a perspective view showing a bent state of the conventional FFC.

As shown in FIG. 5A, the conventional FFC has at least one energizable rectangular core wire 1 and an insulating film 2 for insulating between the core wires and between the core wire 1 and the outside. And a strip-shaped insulating portion 3 insulated by thermocompression bonding so that the core wire 1 is sandwiched while the insulating film 2 keeps a space between the core wires 1 adjacent to each other, and the core wire 1 is at a separated position such as an electric circuit. It is composed of a plurality of terminal portions 4 which can be soldered to a plurality of terminals.

When the conventional FFC is bent and used, the shape shown in FIG. 5B is obtained.

[0006]

DISCLOSURE OF THE INVENTION Conventional FFC described above
Since the spacing between the core wires is maintained by thermocompression bonding of the insulating film 2 of the strip-shaped insulating portion 3, the X axis direction, the Y axis direction, the Z axis direction, the X axis rotation direction, the Y axis rotation direction, If the Z-axis is stretched, bent, or rotated in the rotation direction, the core wire 1 moves between the insulating films 2 and the insulation between adjacent core wires is deteriorated.

Further, when the terminals of an electric circuit or the like are not on the same straight line, the terminals on an immovable body are connected to the terminals on a movable object, or the terminals on a movable object are connected to terminals on another movable object, etc. Flexible relative circuit (hereinafter referred to as FPC)
Since the rigidity is higher than that of the above, there is a problem that a load such as vibration or shock is applied to the soldering portion of the terminal portion 4 to induce an accident such as disconnection or dropping, and a problem that the height of the bent portion becomes large during bending. .

An object of the present invention is to provide an FFC composed of a plurality of core wires having terminals that can be soldered at both ends, and a straight line in which the insulating portion between the terminals at both ends is perpendicular or angled in the longitudinal direction. By forming a bellows structure part in which mountain folds and valley folds are formed in order, the above-mentioned drawbacks are eliminated, and the positional relationship of the terminal parts at both ends is translated, rotated,
An object of the present invention is to provide an FFC that reduces the stress acting between each core wire sandwiched between two insulating films even if it changes due to refraction or the like.

[0009]

Means for Solving the Problems FFC of the first invention
Is at least one energizable rectangular core wire, an insulating film for insulating between each core wire and between the core wire and the outside,
An FFC including an insulating part that is insulated by thermocompression bonding an insulating film so as to sandwich the core wire and a plurality of terminal parts for soldering the core wire to a plurality of terminals that are separated from each other. However, it has a bellows structure portion having a plurality of bent portions.

In the FFC of the second aspect of the present invention, the bellows structure portion of the FFC of the first aspect of the invention is such that the bending direction of the bending portion keeps a constant angle with respect to the axial direction of the core wire and is parallel to the adjacent bending portion. It has a bellows structure that is formed in a simple state.

In the FFC of the third aspect of the present invention, the bellows structure portion of the FFC of the above-mentioned first aspect of the present invention has a bending portion whose bending direction has an angle with respect to the bending direction of an adjacent bending, and which is radial or fan-shaped. It has a bellows structure.

[0012]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a perspective view of an FFC according to an embodiment of the present invention.

In FIG. 1, at least one energizable rectangular core wire 1, an insulating film 2 that insulates each core wire and between the core wire 1 and the outside, and insulates while maintaining a space between adjacent core wires. A bellows structure portion 51 in which an insulating portion 3 is insulated by thermocompression so that the film 2 sandwiches the core wire 1 and a plurality of bent portions 6 whose bending direction is perpendicular to the axial direction of the core wire 1 are formed in the insulating portion 3. And the core wire 1 is composed of a plurality of terminal portions 4 which can be soldered to a plurality of terminals at separate positions of an electric circuit or the like.

FIG. 2 is a perspective view showing the operation of the FFC of FIG.
2 (a) is a diagram showing the operation in the contraction direction, FIG.
FIG. 2B is a diagram showing an operation in the extending direction, FIG. 2C is a diagram showing a bending operation on the one plane, and FIG. 2D is a diagram showing an operation in the step direction.

As shown in FIGS. 2A and 2B, the FFC
By uniformly changing the bending angle of the bellows structure portion 51, the orthogonal expansion and contraction operation is enabled. And FIG. 2 (c)
Indicates a bending motion on one plane, and the bellows structure portion 51
The side end in one direction is contracted and the other side end is expanded so that the bending operation on one plane is possible. Figure 2
(D) shows the operation in the step direction, which can be performed by applying the expansion / contraction operation in the step direction.

Next, an FFC according to another embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a structural view of an FFC according to another embodiment of the present invention, and FIG. 3A is a perspective view of an FFC according to another embodiment.
FIG. 3B is a development view of the FFC shown in FIG.

In the bellows structure portion 52 shown in FIG. 3, the bending portion 6 has a radial shape or a fan shape with the bending direction of the bending portion 6 keeping an angle with respect to the bending direction of the adjacent bending portion 6.
FC is shown, which facilitates rotational operation and the like on the same plane.

Next, the FFC according to another embodiment of the present invention.
Will be described with reference to the drawings.

FIG. 4 is a structural view of an FFC according to another embodiment of the present invention, FIG. 4A is a perspective view of an FFC according to another embodiment, and FIG. 4B is a view of the FFC shown in FIG. 4A. FIG.

In the bellows structure portion 53 shown in FIG. 4, there is shown an FCC in which the bending direction of the bending portion 6 has a constant angle with respect to the axial direction of the core wire 1 and is in parallel with an adjacent bending portion.

When both ends of the bellows structure portion 53 perform maximum extension operation, it is possible to connect terminals on the same straight line, and
When both ends expand and contract, it is possible to connect terminals in parallel positions.

In addition to using various bellows structures as in the above embodiments, it is possible to use a plurality of bellows of the same kind or to combine different kinds of bellows structures, in which case it is possible to operate in all directions.

[0025]

As described above, the FFC of the present invention.
States that by using a bellows structure portion bent in the surface direction of the insulating portion of the FFC, it is possible to maintain the distance between the core wires and prevent the deterioration of insulation, while enabling operations such as expansion, contraction, bending and rotation. effective.

Further, by combining various bellows structure parts, a plurality of same kind of bellows structure parts, and different kinds of bellows structure parts, X
There is an effect that it is possible to supply the FFC having degrees of freedom in all directions such as the axes, the Y-axis, the Z-axis, and the rotation directions of the axes.

Further, since the degree of freedom is increased, the FFC
Since it is possible to absorb a load such as a vibration or a shock that acts on, there is an effect of preventing an accident such as a dropping of a soldering portion of a terminal portion or a break of a core wire.

With the above effects, it is possible to connect terminals that are not in the same straight line or between terminals that have a relative change in position, and since they can be used in the same way as expensive FPCs, an inexpensive connection cable It became possible to supply as.

Further, in the FPC, the width of the conductor can be arbitrarily set, but on the other hand, the thickness of the conductor is thin and it is difficult to connect to a circuit device handling electric power. On the other hand, the FFC can make the conductor thicker than the FPC. There is an effect.

[Brief description of drawings]

FIG. 1 is a perspective view of an FFC according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an operation of the FFC of FIG. Figure 2
(A) is a figure which shows the operation | movement in the contraction direction. Figure 2
(B) is a figure which shows the operation | movement in the extension direction. Figure 2
(C) is a figure which shows the bending operation | movement on the one plane. FIG. 2D is a diagram showing the operation in the step direction.

FIG. 3 is a structural diagram of an FFC according to another embodiment of the present invention.
FIG. 3A is a perspective view of an FFC according to another embodiment. Figure 3
FIG. 3B is a development view of the FFC shown in FIG.

FIG. 4 is a structural diagram of an FFC according to another embodiment of the present invention. FIG. 4A is a perspective view of an FFC according to another embodiment. FIG. 4B is a development view of the FFC shown in FIG.

FIG. 5 is a structural diagram of a conventional FFC. FIG. 5A is a perspective view of a conventional FFC. FIG. 5B is a perspective view showing a state where the conventional FFC is bent.

[Explanation of symbols]

 1 core wire 2 insulating film 3 insulating part 4 terminal part 51, 52, 53 bellows structure part 6 bending part 7 bending angle

Claims (3)

[Claims] 1. At least one current-carrying rectangular core wire, an insulating film for insulating between the core wires and between the core wire and the outside, and thermocompression bonding so that the insulating film sandwiches the core wire. In a flexible flat cable composed of an insulating part that is insulated by a plurality of terminal parts for soldering to the plurality of terminals that are spaced apart from each other, the insulating part forms a plurality of bent parts. A flexible flat cable having a bellows structure part. 2. The bellows structure portion has a bellows structure formed in a state in which a bending direction of the bent portion maintains a constant angle with respect to an axial direction of the core wire and is parallel to an adjacent bent portion. The flexible flat cable according to claim 1. 3. The flexible structure according to claim 1, wherein the bellows structure portion has a radial or fan-shaped bellows structure in which a bending direction of the bent portion has an angle with respect to a bending direction of an adjacent bend. Flat cable.