JP2000331544A - Flat shield cable and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sealed cable with an inexpensive price and stable quality by forming a cover of the sealed eable by ultrasonic welding without interposing an adhesive layer. SOLUTION: A flat shield cable 10 has signal wires 11, 12 and a drain wire 13 (elements 11-13) placed in parallel. The elements 11-13 are covered with a common shield layer 14, and the outer circumference of the shield layer 14 is covered with an insulating sheath 15 to form flat structure. The shield layer 14 is formed by ultrasonic welding so as to have a glasses-shaped cross section and be arranged at constant intervals to join the elements 11-13. The shield layer 14 is preferable to be made of a metal-covered synthetic resin tape such as a copper-coat polyester tape with high shielding effect, high tape fusion force, and high tensile strength. The width of the tape is made 5-200 mm, and the thickness of the metal covered layer is made 8-16 μm. An insulating material such as PVC is used in the insulating sheath 15. The flat shield tape 10 suitable for a car shield tape is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat shielded cable, and more particularly to a method for forming a cover with a shield tape.

[0002]

2. Description of the Related Art Flat shielded cables are widely used in automobiles. FIG. 1 is a sectional view showing an example of the configuration of a flat shielded cable. In the figure, reference numeral 10 denotes a shielded cable. This shielded cable 10 is
1 and 12, and a drain wire 13 are covered with a shield tape 14 and an insulating sheath 15 is further covered therearound, and has a flat structure as a whole.

In the shielded cable 10 having such a structure, the covering form of the shield tape 14 and the signal wires 11, 12 or the drain wires 13 is as shown in FIG. That is, the reinforcing layer 1 made of a polyester film or the like.
An adhesive layer 16 is provided in a zebra shape on one surface of a shield tape 14 formed by providing a metal foil 14B of Cu or the like on 4A, and heating and pressing are performed with a roller or the like, and each element 11 to 13 The shield tape 14 was formed in a spectacle-shaped cross section and at a constant line pitch, and was thermally fused. In FIG. 2, reference numeral 17 denotes an adhesive layer for bonding the shield tape 14 and the insulating sheath 15 to each other.

[0004] However, in the above-mentioned conventional flat shielded cable, an adhesive is used when forming the coating of the shield tape, so that the material cost is increased and the manufacturing cost is increased. In addition, the method of forming the coating of the shield tape by heating and pressurizing causes a variation in the heating temperature due to a temperature difference between summer and winter, so that the shield tape molding state is uneven, that is, fusion is performed. There is a problem that a portion that is not fused to a portion occurs.

[0005]

SUMMARY OF THE INVENTION The present invention solves such problems of the prior art, can reduce material costs, and can maintain a stable shield tape molding state regardless of a temperature difference. It is an object of the present invention to provide a flat shielded cable that is inexpensive and has stable quality.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a plurality of signal lines and drain lines are juxtaposed, covered with a shield tape and further covered with an insulating sheath. In a flat shielded cable according to the present invention, there is provided a flat shielded cable characterized in that the coating of the shield tape is formed by ultrasonic welding without interposing an adhesive layer. Further, according to the present invention, there is provided a flat shielded cable having the above configuration, wherein a press-connecting connector or a crimp terminal is applied to an end of the flat shielded cable. Further, according to the present invention, there is provided a flat shielded cable according to the above configuration, wherein the flat shielded cable is a shielded cable for an automobile. Further, according to the present invention, in a method of manufacturing a flat shielded cable in which a plurality of signal lines and drain lines are juxtaposed with each other, and these are covered with a shielding tape and further covered with an insulating sheath, A flat shielded cable characterized in that it includes a step of applying a shield tape around the signal line and the drain line juxtaposed to each other without interposing an adhesive layer and forming the coating by ultrasonic welding. A manufacturing method is provided.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to examples. The flat shielded cable according to the present invention is particularly preferably used in automobiles, and is a type in which a press-connecting connector or a crimp terminal is applied to an end thereof. The flat shielded cable according to the present invention is the same as that shown in FIGS. 1 and 2 except that the shield tape 14 is brought into close contact with the signal lines 11, 12 and the drain line 13 by ultrasonic bonding instead of interposing the adhesive layer 16. The coating is formed. That is, the flat shielded cable 10 according to the present invention includes a signal line 11,
12 and a drain line 13.
Are juxtaposed parallel to each other. The elements 11 to 13 are covered with a common shield tape 14, and the outer periphery of the shield tape 14 is covered with an insulating sheath 15,
As a whole, it has a flat structure. Then, the shield tape 14 is formed into a spectacle shape in cross section and at a constant line pitch by ultrasonic welding, and is joined to the elements 11 to 13. The shield tape 14 and the insulating sheath 15 can be adhered in the same manner as in the related art. In the present invention, it is preferable that the shield tape 14 has an excellent shielding effect, a large tape fusion force (hard to peel), and a large tape tensile strength (hard to tear), such as a copper-coated polyester tape and an aluminum-coated polyester tape. A metal-coated synthetic resin tape is used. The tape width is 5 to 200 mm, and the thickness of the metal coating layer is 8 to 16 μm. In the insulating sheath 15,
An insulating material such as PVC or polyolefin resin is used.

Here, the formation of the shield tape by ultrasonic welding will be described. "Ultrasonic welding" means that an object to be welded (metal, alloy) is sandwiched and a moderate pressure is applied.
The joining is achieved by locally applying ultrasonic vibration energy to the object to be joined in parallel. When ultrasonic vibration energy is applied in this manner, the oxide film on the portion to be joined is destroyed and removed by the sliding movement due to the compressive deformation and the vibration, and the cleaning surfaces come into contact with each other, and the elastic surface and the plastic surface are deformed and crushed. The distance between the two metals is so close that an attractive force between the atoms acts, and the temperature rise at the interface due to frictional heat helps this, and the metal can be joined.

FIGS. 3 (a) and 3 (b) are a perspective view and a front view, respectively, showing how a shield tape is formed by ultrasonic welding. In the figure, reference numeral 20 denotes an ultrasonic welding machine, which includes a power supply 21, a converter 22, a booster 23, a horn 24, an upper roller 25, a chip 26, a lower roller 27,
An anvil 28, a base plate 29, and a spring 30 are provided. In the drawing, W is a work, that is, an object to be joined. The power supply 21 converts an electric signal having a frequency of 50/60 Hz into a large frequency (for example, 20 kHz, 40 kHz).
It oscillates after being converted into the frequency of the electric signal of z). The converter 22 converts an electric signal from the power supply 21 into mechanical vibration using a piezoelectric element. The booster 23 is a mechanical amplitude converter that supplies a mechanical vibration having an optimum amplitude to the tip of the horn 24. The horn 24 is a resonator and transmits ultrasonic waves to the chip 26 and thus to the upper roller 25. The upper roller 25 is rotatably supported by the support frame and applies ultrasonic vibration to the work W. The anvil 28 is a support for the work W, where the lower roller 27 rotatably supported by the support frame is urged upward by the pressing force of the spring 30 to apply an appropriate pressure to the work W. The roller width of the upper roller 25 and the lower roller 27 is set to a value corresponding to the pitch between signal lines or between the signal line and the drain line. As the roller material, a steel material or the like can be used.

The state of the work W before ultrasonic welding is performed is as follows.
For example, it is as shown in FIG. The apparatus shown in FIG. 3 is configured as shown in FIG. FIG.
When ultrasonic welding is performed in the form as shown in FIG. 3B, four upper rollers and four lower rollers are used. The work W is set on the anvil 28 and the lower roller 27
While applying an appropriate pressure to the work W, ultrasonic waves are applied from the upper roller 25. At this time, the work W is moved at an appropriate speed in the direction of the arrow. Thereby, the covering of the shield tape is formed without using an adhesive.

[0011]

According to the present invention, since the above configuration is employed, the coating of the shield tape can be formed without using an adhesive, so that the material cost can be reduced and the flat shield cable which is less expensive can be obtained. Can be provided. In addition, it is possible to provide a flat shielded cable of stable quality regardless of a temperature difference.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a flat shielded cable.

FIG. 2 is an explanatory sectional view of a coating of a shield tape.

FIGS. 3A and 3B are a perspective view and a front view, respectively, showing how a shield tape is formed by ultrasonic welding.

FIGS. 4A and 4B are diagrams showing a state of a work W before ultrasonic welding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flat shield cable 11, 12 Signal wire 13 Drain wire 14 Shield layer 15 Insulating sheath 20 Ultrasonic welding machine 21 Power supply 22 Converter 23 Booster 24 Horn 25 Upper roller 26 Chip 27 Lower roller 28 Anvil 29 Base plate 30 Spring W Work

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsushi Tanaka 1-7-10 Kikuzumi, Minami-ku, Nagoya City, Aichi Prefecture Inside Harness Research Institute, Inc. (72) Inventor Shizuya Kawabe 1-Kikuzumi, Minami-ku, Nagoya City, Aichi Prefecture No. 7-10 Harness Research Institute, Ltd. F-term (reference) 5G311 CA01 CB01 CB02 CC02 CD03 CE01 CF06 5G313 AB05 AC03 AC11 AD02 AD07 AE01 AE08 5G319 EA02 EB06 EC04 EC07 ED01 ED02 5G327 AA10 AC03

Claims (4)

[Claims] 1. A flat shielded cable in which a plurality of signal lines and drain lines are juxtaposed, covered with a shield tape, and further covered with an insulating sheath, wherein the shield tape is coated with an adhesive. A flat shielded cable characterized by being formed by ultrasonic welding without intervening layers. 2. The flat shielded cable according to claim 1, wherein a press-connecting connector or a crimp terminal is applied to an end of the flat shielded cable. 3. The flat shielded cable according to claim 1, wherein the flat shielded cable is a shielded cable for an automobile. 4. A method of manufacturing a flat shielded cable in which a plurality of signal lines and a drain line are juxtaposed, covered with a shield tape and further covered with an insulating sheath, A method for manufacturing a flat shielded cable, comprising a step of applying a shield tape around an arrangement in which a drain wire and a drain wire are arranged side by side without interposing an adhesive layer, and forming the coating by ultrasonic welding.