JPH0512936A - Manufacture of flat cable - Google Patents

Abstract

PURPOSE:To provide a manufacture of a flat cable capable of preventing a dislocation of the spacing between respective metal conductors, which is caused when a plurality of metal conductors arranged in parallel being put between plastic tapes from its both surfaces, inside and outside. CONSTITUTION:A number of metal conductors 1a and 1b are arranged in parallel, next it is put between plastic tapes 2a and 2b from both surfaces, inside and outside, and subsequently be pressurized by pressing rollers 3a and 3b so as to form a laminate. Here, prior to putting the metal conductors 1a and 1b between the plastic tapes 2a and 2b, introducing grooves 5 corresponding to the arrangement pattern of metallic conductors 1a and 1b are formed, on the inner surface 8 of the tape 2, by forming rollers 4a and 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flat cable used for wiring inside and outside an electronic device such as a computer.

[0002]

2. Description of the Related Art As shown in FIG. 3, a flat cable formed by laminating a plurality of metal conductors 1a, 1b arranged in parallel with plastic tapes 2a, 2b on both sides of the front and back has been conventionally used. The metal conductors 1a and 1b are, for example, 2
One to three sets are used as one set, one of them is used as a signal line and the rest is used as a ground line, and many sets are arranged in parallel. Further, since the longitudinal ends of the cable are collectively attached to the connector, a strict tolerance target value is generally set for the interval between the metal conductors 1a and 1b in terms of workability. is there. Incidentally, an example of the target value of the tolerance of the interval between the metal conductors 1a and 1b is as follows. Interval between adjacent signal conductors 1a: a = 1.27 mm
± 0.03 mm Distance between signal conductor 1a and ground conductor 1b: b = 0.48 mm
± 0.04 mm Interval between adjacent ground conductors 1b: c = 0.31 mm
± 0.05 mm Distance between the signal conductors 1a on both outer sides: d = 49.53 m
m ± 0.15 mm In order to manufacture the flat cable described above, conventionally, as shown in FIG. 4A, a large number of metal conductors 1a and 1b arranged at a predetermined interval as shown in FIG. Then, the plastic tapes 2a and 2b are sent out from both the front and back sides to sandwich the metal conductors 1a and 1b, and the plastic tapes 2a and 2b are pressed by pressure rollers 3a and 3b to form a laminate, and if necessary. Heat treatment is performed.
In this case, as shown in FIG.
As shown in (b), a forming groove 6 is formed in accordance with the arrangement pattern of the metal conductors 1a and 1b to make the intervals between the metal conductors 1a and 1b uniform.

[0003]

However, even if the molding groove 6 is provided as described above, the surfaces of the metal conductors 1a and 1b and the plastic tapes 2a and 2b are smooth, so that the metal conductor 1
When a and 1b are sandwiched between the plastic tapes 2a and 2b from both front and back sides and laminated, the metal conductors 1a and 1b
Slips out of the molding groove 6 and becomes a defective product without a prescribed interval, resulting in a decrease in production yield.

[0004]

It is an object of the present invention to provide a method for manufacturing a flat cable capable of preventing the displacement of the metal conductor that occurs when the metal conductor is sandwiched between the front and back surfaces with a plastic tape.

[0005]

According to the method of manufacturing a flat cable of the present invention, as shown in FIG. 1A, a large number of metal conductors 1a and 1b are arranged in parallel and sent out, and plastic tapes 2a and 2b are attached from both front and back surfaces thereof. Send out both tapes 2
In the method for producing a flat cable in which the metal conductors 1a and 1b are sandwiched by a and 2b, and the tapes 2a and 2b are pressed by the pressure rollers 3a and 3b to form a laminate, the metal tapes 2a and 2b are used as the metal conductors. 1
Before sandwiching a and 1b, the same plastic tape 2a, 2b
Introducing grooves 5 for introducing the metal conductors 1a and 1b by the molding rollers 4a and 4b into the arrangement pattern of the metal conductors 1a and 1b.
It is formed according to the type.

[0006]

In the method of manufacturing a flat cable according to the present invention shown in FIG. 1 (a), a large number of metal conductors 1a and 1b are arranged in parallel.
Before sandwiching the plastic tape 2a, 2b from both front and back sides with the molding rollers 4a, 4b,
On the inner surface 8 of 2b (the surface between which the metal conductor is sandwiched), the metal conductor 1
Since the introduction groove 5 corresponding to the arrangement pattern of a and 1b (FIG. 3) is formed, the metal conductors 1a and 1b are fitted into the introduction groove 5 and guided to the pressure rollers 3a and 3b without displacement. Further, the metal conductors 1a and 1b are prevented from slipping and shifting during lamination because they are guided by the molding grooves 6 of the pressure rollers 3a and 3b.

[0007]

[Embodiment 1] FIG. 1 shows an embodiment of a method for manufacturing a flat cable of the present invention. This is 40 silver-plated annealed copper wires having a diameter of 0.203 mmφ as the signal conductor 1a and 8 silver-plated annealed copper wires having a diameter of 0.254 mmφ as the ground conductor 1b.
As shown in FIG. 3, the ground conductor 1b-
One set of the arrangement pattern of the signal conductor 1a and the ground conductor 1b was arranged and sent out in 40 sets. As the plastic tapes 2a and 2b to be sent to both the front and back surfaces of these metal conductors 1a and 1b, width 52.07 mm, thickness 0.3 mm
Then, a PTFE (polytetrafluoroethylene (tetrafluoroethylene)) tape having excellent electrical insulation properties was used. The pressure rollers 3a and 3b are the same as those of conventional pressure rollers, that is, semicircular at intervals according to the arrangement pattern of the metal conductors 1a and 1b in the circumferential direction of the outer peripheral surface as shown in FIG. 4 (b). The molding groove 6 was used. In addition, the molding rollers 4a and 4b are arranged at intervals according to the arrangement pattern of the metal conductors 1a and 1b in the circumferential direction of the outer peripheral surface thereof.
As shown in (b) and (c), a ridge 7 was used. The ridge 7 in FIG. 1B has a V-shaped cross section, and the ridge 7 in FIG. 1C has a semicircular cross section. The cross-sectional shape of the ridge 7 is basically the plastic tape 2a, 2
It is sufficient that the introduction grooves 5 can be formed on the inner surface 8 of b at intervals according to the arrangement pattern of the metal conductors 1a and 1b.
Then, these molding rollers 4a and 4b were brought close to and opposed to the upper pressure roller 3a and the lower pressure roller 3b, respectively, as shown in FIG.

In FIG. 1 (a), the upper tape 2a is sandwiched between the upper molding roller 4a and the pressure roller 3a, and the metal conductor 1a is formed on the inner surface 8 of the tape 2a by the ridges 7 of the molding roller 4a. The introduction groove 5 was formed according to the arrangement pattern of 1b. Further, the lower tape 2b is sandwiched between the lower molding roller 4b and the pressure roller 3b, and the protrusion groove 7 of the molding roller 4b forms the introduction groove 5 corresponding to the arrangement pattern of the metal conductors 1a and 1b on the inner surface 8 of the tape 2a. Formed. Then, the metal conductors 1a, 1b are fed between the tapes 2a, 2b to guide the metal conductors 1a, 1b into the introduction groove 5 formed as described above, and to draw in the upper and lower pressure rollers 3a. Tapes 2a and 2b with 3b
Was pressed and laminated. Then, heating and firing were performed to produce a flat cable. When the distance between the metal conductors 1a and 1b of this cable was measured over the entire length in the longitudinal direction, the following results were obtained. Item Target value Measured value Signal conductor-signal conductor pitch a 1.24 to 1.30 1.24 to 1.30 Signal conductor-ground conductor pitch b 0.44 to 0.52 0.46 to 0.49 Ground conductor to ground conductor pitch c 0.26 to 0.36 0.29 to 0.33 Space between signal conductors d 49.38 to 49.68 49.40 to 49.66 As described above, the metal conductors 1a, 1b in the entire length in the longitudinal direction.
All of the fluctuations were within the target values, and a sufficiently satisfactory product was obtained.

[0009]

[Embodiment 2] FIG. 2 shows another embodiment of the method for manufacturing a flat cable of the present invention. Metal conductor 1 in FIG.
a, 1b, plastic tapes 2a, 2b, pressure rollers 3a, 3b and molding rollers 4a, 4b are shown in FIG.
I used the same ones. In this embodiment, FIG.
As shown in (a), the molding rollers 4a and 4b were brought close to and face the auxiliary rollers 9a and 9b. In this case, as the auxiliary rollers 9a and 9b, those having a smooth outer peripheral surface as shown in FIG. 2B were used. And these auxiliary rollers 9
As shown in FIG. 2A, a and 9b are made to face and approach the upper molding roller 4a and the lower molding roller 4b. Further, the upper and lower pressure rollers 3a and 3b are made to face each other and approach each other. In this combination, first, the upper tape 2a is sandwiched between the upper molding roller 4a and the auxiliary roller 9a, and the ridge 7 of the molding roller 4a is inserted into the auxiliary groove 10 of the auxiliary roller 9a.
It is fitted inside, and the introduction groove 5 is formed on the inner surface 8 of the tape 2a.
To mold. Further, the lower tape 2b is sandwiched between the lower molding roller 4b and the auxiliary roller 9b, the ridge 7 of the molding roller 4b is fitted into the auxiliary groove 10 of the auxiliary roller 9b, and the tape 8 is introduced into the inner surface 8 of the tape 2b. The groove 5 is formed.
Then, attach the upper and lower tapes 2a and 2b to the upper and lower pressure rollers 3.
a and 3b, and the metal conductors 1a and 1b are attached to both tapes 2
Then, the tapes 2a and 2b are fitted into the introduction grooves 5 of a and 2b and pulled in, and the tapes 2a and 2b are pressed by both pressure rollers 3a and 3b to form a laminate. Then, heating and firing were performed to produce a flat cable. The metal conductor 1a of this cable,
When the distance between 1b was measured over the entire length in the longitudinal direction, the following results were obtained.

Item Target value Measured value Signal conductor-signal conductor pitch a 1.24 to 1.30 1.24 to 1.30 Signal conductor-ground conductor pitch b 0.44 to 0.52 0.46 to 0.49 Ground conductor to ground conductor pitch c 0.26 to 0.36 0.29 to 0.33 Distance d between signal conductors on both outer sides 49.38 to 49.68 49.40 to 49.66 In this second embodiment as well, the metal conductor 1 is used as in the first embodiment.
The variation in the interval between a and 1b was within the target value. The auxiliary rollers 9a and 9b are shown in FIGS.
Forming rollers 4a, 4b in the circumferential direction of the outer peripheral surface as shown in FIG.
It is also possible to use the one in which the auxiliary groove 10 is formed so as to face the ridge 7. The auxiliary groove 10 shown in FIG. 2C has a V-shaped cross section, and the auxiliary groove 10 shown in FIG. 2D has a semicircular cross section.

By the way, the evaluation results of the intervals between the metal conductors 1a and 1b of the flat cable manufactured by the conventional flat cable manufacturing method are as follows. Item Target value Measured value Signal conductor-to-signal conductor pitch a 1.24 to 1.30 1.20 to 1.33 Signal conductor-to-ground conductor pitch b 0.44 to 0.52 0.43 to 0.56 Ground conductor-to-ground conductor pitch c 0.26 to 0.36 0.23 to 0.37 Signal conductor spacing d 49.38 to 49.68 49.23 to 49.84 In this flat cable, the spacing between the metal conductors 1a and 1b fluctuated, and a target value cracked portion was formed.

[0012]

When a flat cable is manufactured by the method for manufacturing a flat cable of the present invention, as is clear from the evaluation results of the above-mentioned embodiments, the variation in the interval between the metal conductors 1a and 1b is small and stable, and It is possible to improve quality and yield.

[Brief description of drawings]

FIG. 1 (a) is a schematic view showing an embodiment of a method for producing a flat cable of the present invention, and FIG. 1 (b) is a partial sectional view showing an example of a molding roller in the method for producing a flat cable. The figure and the figure (c) are the fragmentary sectional views showing other examples of the forming roller in the manufacturing method of the flat cable.

FIG. 2 (a) is a schematic view showing another embodiment of the method for producing a flat cable of the present invention, and FIG. 2 (b) is an example of a forming roller and an auxiliary roller in the method for producing a flat cable. FIG. 6C is a partial cross-sectional view showing another example of the molding roller and the auxiliary roller in the method for manufacturing the flat cable, and FIG. 7D is molding in the method for manufacturing the flat cable. The partial sectional view which shows the other example of a roller and an auxiliary roller.

FIG. 3 is a vertical cross-sectional view of the flat cable in the width direction.

FIG. 4A is a schematic view showing an example of a conventional flat cable manufacturing method, and FIG. 4B is a conventional flat cable manufacturing method.
FIG. 6 is a partial cross-sectional view of a pressure roller in the method for manufacturing a bull.

[Explanation of symbols]

 1a, 1b Metal conductor 2a, 2b Plastic tape 3a, 3b Pressure roller 4a, 4b Molding roller 5 Introduction groove

Claims (1)

Claims: 1. A large number of metal conductors 1a, 1b are arranged in parallel and sent out, and a plastic tape 2 is provided on both front and back surfaces thereof.
In the method for producing a flat cable in which a and 2b are sent out, the metal conductors 1a and 1b are sandwiched between the two tapes 2a and 2b, and the tapes 2a and 2b are pressed by pressure rollers 3a and 3b to form a laminate. Before sandwiching the metal conductors 1a, 1b between the plastic tapes 2a, 2b, molding rollers 4a, 4b are formed on the plastic tapes 2a, 2b.
2. A method for manufacturing a flat cable, characterized in that the introduction groove 5 for introducing the metal conductors 1a, 1b is formed according to the arrangement pattern of the metal conductors 1a, 1b.