JPH0322818Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flat cable used for connecting electrical parts.

[Conventional technology]

Flexible cables or flat cables, which are flat and flexible, are widely used for connections between electrical components such as printed circuit boards.

FIG. 4 is for explaining the connection of such cables. This belt-shaped cable 1 is made by forming a plurality of conductors 3 ₁ to 3 _{N on a film-like insulating sheathing material 2A made of polyester or the like through plating and etching processes, and then placing a similar insulating sheathing material 2B on top of the conductors 3 1 to 3 N.} It is covered with Insulating coating material 2B
The length of the cable 1 is slightly shorter than the insulating coating 2A, and the conductors 3 ₁ to 3 _N are exposed at both ends of the cable 1 to form conductor portions 4A and 4B. The conductor parts 4A and 4B are connected to a package 5A such as a printed circuit board.
and 5B connection terminals 6A, 6B,
It is designed to be electrically connected.

In this conventionally used cable 1, each conductor 3
₁ to 3 _N are formed on the same surface, so the arrangement order of these in each conductor portion 4A, 4B is completely the same. Therefore, as shown in this figure, the pin arrangement of both connection terminals 6A and 6B is required to be in the same order.

However, as packages become smaller and the printed patterns inside them become more dense, limiting the arrangement of connection terminal pins to one direction may result in considerable difficulty in pattern design. Therefore, a cable has been proposed that can easily connect packages with pins arranged in opposite directions.

FIG. 5 shows such a cable in its unfolded state. The cable 11 is bent at its center in the unfolded state. In the figure, dot-dash line 1
When divided into three areas, an upper area 14, a folded area 15, and a lower area 16, with 2 and 13 as boundaries,
The upper region 14 and the lower region 16 are trapezoidal, and the folded region 15 is a parallelogram. Upper area 14
An upper conductor section 18A and a lower conductor section 18B, in which the conductors 17 ₁ to 17 _N are exposed, are arranged at the upper and lower ends, respectively. These upper conductor portions 18A, lower conductor portions 18B, and their vicinity are provided with a conductor 1.
Reinforcing sheets 19A and 19B are adhered to the surfaces opposite to the exposed surfaces of 7 ₁ to 17 _N , respectively, to reinforce the respective conductor portions 18A and 18B. Cutouts 21A and 21B present in the respective conductor portions 18A and 18B are for preventing reverse insertion into the connection terminal.

FIG. 6 shows the shape of this cable 11 when in use. The cable 11 is folded back at the folding region 15 so as to have a band-like shape as a whole. The overlapping portions due to folding are adhered with an adhesive or the like, if necessary. In this way, when the cable 11 is folded back, the upper region 14 and the lower region 16 are turned upside down, so the arrangement of the conductors 17 ₁ to 17 _N of the upper conductor portion 18A and the lower conductor portion 18B is reversed. In other words, this allows connections between packages with reverse pin configurations.

[Problem that the invention attempts to solve]

However, the cables shown in FIGS. 5 and 6 have a problem in that when the insulating sheathing material, such as polyester, is cut to produce the cables, a considerable amount of the insulating sheathing material is wasted. 7th
The figure shows the state of cutting when a roll of insulation sheathing material 21 is cut into the shape shown in FIG. , will be discarded.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a cable that allows connection between packages having pins arranged in opposite directions, and that causes almost no wastage of insulating sheathing material.

[Means for solving problems]

In the present invention, as shown in FIG.
Two rectangles 33, 34 with sides A and 32B
and a parallelogram 35 sandwiched between these rectangles 33 and 34 are connected to each other. Here, the lengths a and b of the sides in the length direction of the cables in the two rectangles 33 and 34 are not necessarily equal, but the lengths c and d of the sides in the width direction are equal. In addition, in the parallelogram 35, since the cable as a whole needs to have an almost band-like shape when this part is folded back, one diagonal line 36 forms one side 37 of each of the two rectangles 33 and 34. ，
38. At this time, rectangles 33 and 34 and parallelogram 3
The angles formed by the two common sides of 5 and the diagonal line 36 are all right angles.

In a cable of this shape, the two sides of the parallelogram are parallel to the end of the cable, so it is possible to cut the cables in the same shape without any gaps, and the insulating coating material can be used efficiently. Note that it is convenient for the cable to be used if the portion corresponding to the parallelogram is folded back in advance and the overlapping portions are glued.

〔Example〕

FIG. 2 is a plan view showing the shape of the cable of this embodiment in its unfolded state. This cable 4
1 is composed of a rectangular upper region 42 and a lower region 43, and a parallelogram-shaped folded region 44 sandwiched therebetween, as shown in the figure. When this cable 41 is bent 180 degrees along one diagonal line 45 of the parallelogram, the cable 41 as a whole has a substantially band-like shape. At this time, the length of the cable 41 in this embodiment is 70 cm, and the width is 42 cm. This cable 41 is made by forming a conductor pattern on a polyester sheet having this shape through plating and etching processes, and then bonding the polyester sheet so as to cover the conductor pattern. Conductors 46 ₁ to 46 _N are exposed at the ends of the polyester sheet serving as an insulating coating, and constitute an upper conductor portion 47A and a lower conductor portion 47B, respectively. These conductor portions 47A, 47B and their vicinity are lined with reinforcing sheets 48A, 48B to provide strength when inserted into the connection terminal. Further, the conductors 46 ₁ to 46 _N exposed in the conductor portions 47A and 47B are plated with gold or the like, if necessary.

FIG. 3 shows the state in which the insulating sheathing material 21 is cut when mass producing this cable. In this way, with this cable, the two sides of the parallelogram that make up the folding area are parallel to the top and bottom ends of the cable, so cutting can be done almost easily.
Can be done with 100% efficiency.

In the above embodiments, a cable with a single layer structure in which conductors are arranged on one plane before being bent has been described, but it goes without saying that the present invention can be similarly applied to cables in which conductors are arranged in layers. .

[Effect of idea]

As explained above, according to the present invention, the unfolded shape of the cable is two rectangles and a parallelogram sandwiching the two rectangles, so more cables can be manufactured from the same area of insulation sheathing material. , the time required for manufacturing can be shortened. Furthermore, since almost no insulation coating material is wasted during cutting, it also contributes to resource and energy savings.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the basic shape of the cable of the present invention in its unfolded state, Fig. 2 is a developed view of the cable in an embodiment of the invention, and Fig. 3 is the insulation required when manufacturing this cable. FIG. 4 is an explanatory diagram showing the state of connection between packages using a conventionally used cable; FIG. 5 is a developed diagram of a conventionally proposed cable;
FIG. 6 is a plan view showing the shape of the proposed cable in use, and FIG. 7 is a plan view showing the cutting locations of the insulating coating when manufacturing the proposed cable. 21... Insulating covering material, 33, 34... Rectangular,
35...parallelogram, 36...diagonal, 42...
Upper region, 43... Lower region, 44... Folding region, 46... Conductor.

Claims (1)

[Claims for Utility Model Registration] 1. A sheet-shaped insulating covering material that covers a planar conductive pattern consisting of a plurality of conductors by sandwiching them from both sides, with each exposed end of the conductor as one side.2. It is formed by connecting two rectangles and a parallelogram sandwiched between these rectangles, and one of the two diagonals of the parallelogram is on the same straight line as one side of each of the two rectangles. A cable characterized by being arranged. 2. The cable according to claim 1, wherein a portion of the insulating coating material corresponding to the parallelogram is folded back.