JP2008150427A - Pressure-sensitive adhesive tape - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To impart a filtering function of improving distortion of a transmission waveform to a pressure-sensitive adhesive tape for binding electric wire. <P>SOLUTION: In the pressure-sensitive adhesive tape 10 to be wound around electric wire constituting a communication circuit, ferrite 13 is contained in a tape substrate 11 and/or a pressure-sensitive adhesive layer 12 formed on one surface of the tape substrate 11. The pressure-sensitive adhesive tape 10 is wound around a branched line near a branched part where the branched line branches from a trunk line of the communication circuit, and improves distortion of a transmission waveform, generated in the branched line, by ferrite 13 in the pressure-sensitive adhesive tape 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an adhesive tape, and more specifically, has a function of alleviating distortion of a transmission waveform generated at a branching portion that branches a branch line from a trunk line of a communication network such as an in-vehicle LAN.

  In a communication network such as an in-vehicle network, when transmitting a signal from one communication device to another communication device, there is a problem that the transmission waveform is distorted due to electrical or magnetic noise and communication is not normally performed. is there. This waveform distortion occurs mainly due to signal reflection caused by impedance mismatch, and it is inevitable that impedance mismatch will occur at the branch point of the communication line and the connection point with the board accommodated in the communication device. It was. For this reason, various techniques for improving waveform distortion at a branch point or a connection point with a communication device have been proposed.

For example, in Japanese Patent Application Laid-Open No. 6-76886 (Patent Document 1), as shown in FIG. 7, the distortion of the transmission waveform is improved by passing the terminal 2 accommodated in the connector housing 1 through the cylindrical ferrite core 3. ing.
However, in the structure provided in Patent Document 1, each terminal 2 must be passed through the cylindrical ferrite core 3 and a structure for holding the ferrite core 3 is required. However, there is a problem that the structure of the connector housing 1 is complicated.
Further, it is difficult to change the shape of the ferrite core 3 for each terminal, and there is a problem that it is difficult to appropriately adjust the effect of improving the waveform distortion.

JP-A-6-76886

  This invention is made | formed in view of the said problem, and makes it the subject to give the filter function which improves the distortion of a transmission waveform to the adhesive tape wound around an electric wire instead of a branch connector.

In order to solve the above-mentioned problem, the present invention is an adhesive tape wound around an electric wire constituting a communication circuit,
There is provided an adhesive tape characterized in that ferrite is contained in a tape base material and / or an adhesive layer provided on one side of the tape base material.

When the adhesive tape having the above structure is wound around the wire of the communication circuit, the magnetic substance ferrite contained in the tape base material and / or the adhesive layer of the adhesive tape absorbs the magnetic field generated in the wire of the communication circuit and converts it into heat. The high frequency component increased due to the impedance mismatch at the branching portion can be reduced, and the distortion of the transmission waveform can be improved.
In addition, since the adhesive tape of the present invention has a filter function for improving the distortion of the transmission waveform, it is not necessary to provide the filter function to the branch connector forming the branch portion of the communication circuit, and the branch connector only branches the circuit. It can be set as a simple structure.
Furthermore, the effect of improving the waveform distortion can be adjusted moderately by simply adjusting the amount of the adhesive tape wound.

It is preferable that the adhesive tape is wound around the branch line in the vicinity of the branch portion where the branch line branches from the trunk line of the communication circuit.
According to the said structure, the distortion of the transmission waveform which is easy to produce in a branch part can be improved with the adhesive tape wound around the branch part of the said branch line.
It should be noted that the winding position of the adhesive tape is not limited to the vicinity of the branching portion, and the distortion of the transmission waveform can be improved by winding the adhesive tape at any position where the distortion of the transmission waveform occurs.

The electric wire constituting the communication circuit is a single communication line or a twisted pair electric wire.
Moreover, the said adhesive tape is good also as a structure which is wound around the power wire which supplies electric power to a required apparatus with the electric wire which comprises the said communication circuit, and binds these electric wires and a power wire.
According to the said structure, while being able to improve the distortion of the transmission waveform of the electric wire which comprises the said communication circuit with the said adhesive tape, a several electric wire and a power wire can be bound.

As described above, according to the present invention, since the magnetic base ferrite is contained in the tape base material and / or the adhesive layer of the adhesive tape, the ferrite absorbs the magnetic field generated in the electric wire of the communication circuit. By changing to heat, the high frequency component increased due to impedance mismatching at the branching portion can be reduced, and distortion of the transmission waveform can be ideally improved.
Further, the effect of improving the waveform distortion can be easily moderately adjusted simply by adjusting the winding amount of the adhesive tape.

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention, in which an adhesive tape 10 is wound around a branch line in the vicinity of a branch portion where a branch line branches from a main line in an in-vehicle LAN that performs CAN communication (differential transmission method). It is.

  As shown in FIG. 1, the adhesive tape 10 is composed of a strip-shaped tape base material 11 made of polyvinyl chloride (PVC) and an adhesive layer 12 made of an adhesive provided on the entire surface of the tape base material 11. The powdery ferrite 13 is contained in the tape base material 11 and the adhesive layer 12.

  As shown in FIG. 2, the communication circuit for wrapping the adhesive tape 10 is connected to one end of a plurality of twisted pair electric wires 20 constituting a differential transmission line by branch connection 21 to form a trunk line. A terminal resistor (not shown) is provided at the other end of the twisted pair electric wire 20A, and a required electronic device 30 is connected to the other end of the twisted pair electric wire 20B serving as a branch line.

The adhesive tape 10 is half-wrapped around the required location of the twisted pair electric wire 20B constituting the branch line so that the adhesive layer 12 is on the inner peripheral side, and as shown in FIG. The entire outer periphery of the twisted pair electric wire 20 </ b> B is surrounded by the adhesive tape 10.
In addition, since the adhesive tape 10 is half-wrapped around the twisted pair electric wire 20B, the adhesive tape 10 is wound twice. However, in FIG. 3, the overlapping of the adhesive tape 10 is not shown.

According to the said structure, since the ferrite base 13 is contained in the tape base material 11 and the adhesion layer 12 of the adhesive tape 10, this ferrite 13 absorbs the magnetic field which generate | occur | produces in the electric wire of a communication circuit, and heats it. In other words, it is possible to reduce the high frequency component increased due to the impedance mismatch of the branching portion, and to improve the distortion of the transmission waveform.
Further, since the adhesive tape 10 wound around the branch line has a filter function for improving the distortion of the transmission waveform, it is not necessary to provide the branch connector 21 with a filter function, and the simple structure in which the branch connector 21 only branches the circuit. It can be.
Furthermore, the effect of improving the waveform distortion can be easily adjusted moderately only by adjusting the winding amount of the adhesive tape 10.

FIG. 4 shows a modification of the first embodiment.
In the present modification, the target for containing the ferrite 13 of the adhesive tape 10 is different from that of the first embodiment, and the ferrite 13 is contained only in the tape substrate 11 of the adhesive tape 10 as shown in FIG. Alternatively, as shown in FIG. 4B, only the adhesive layer 12 of the adhesive tape 10 may contain the ferrite 13.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 5 shows a second embodiment of the present invention.
In this embodiment, the object to which the adhesive tape 10 is wound is different from that of the first embodiment, and the first embodiment is not a twisted-pair electric wire but a communication wire 22 including a single electric wire in which an insulation coating 22b is provided on the strand 22a. The same adhesive tape 10 is wound.
Note that the adhesive tape of the modification of the first embodiment may be wound around the communication line 22.
In addition, since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

FIG. 6 shows a third embodiment of the present invention.
In the present embodiment, together with the twisted pair electric wire 20 of the first embodiment, a plurality of other power supply wires 23 that supply power to a required device are converged, and the adhesive tape 10 is wrapped around the twisted pair electric wires 20 and the power supply wires 23. They are united.
In addition, the adhesive tape of the modification of 1st Embodiment may be wound around the twisted pair electric wire 20 and the power wire 23, or the communication line 22 and other power wire 23 of 2nd Embodiment may be bound by the adhesive tape 10. Good.
In addition, since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

  The pressure-sensitive adhesive tape of the present invention is suitably used as a wire wound around a communication circuit such as an in-vehicle LAN, OA (Office Automation), or FA (Factory Automation).

The adhesive tape of 1st Embodiment of this invention is shown, (A) is a perspective view, (B) is AA sectional view taken on the line. It is the schematic which shows the state which wound the adhesive tape around the communication circuit. It is BB sectional drawing which shows the state which wound the adhesive tape around the twisted pair electric wire. (A) and (B) are modifications of the first embodiment. A 2nd embodiment is shown, (A) is a figure showing the state where adhesive tape was wound around one communication line, and (B) is a CC line sectional view. It is drawing which shows 3rd Embodiment. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Adhesive tape 11 Tape base material 12 Adhesive layer 13 Ferrite 20A, 20B Twisted pair electric wire 21 Branch connector 22 Communication line 23 Power supply line

Claims (4)

An adhesive tape wound around an electric wire constituting a communication circuit,
A pressure-sensitive adhesive tape characterized in that ferrite is contained in a tape base material and / or an adhesive layer provided on one side of the tape base material.   The pressure-sensitive adhesive tape according to claim 1, wherein the pressure-sensitive adhesive tape is wound around the branch line in the vicinity of a branch portion where the branch line branches from the trunk line of the communication circuit.   The pressure-sensitive adhesive tape according to claim 1 or 2, wherein an electric wire constituting the communication circuit is a single communication line or a twisted pair electric wire.   The pressure-sensitive adhesive tape according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive tape is wound around a power supply line that supplies electric power to a required device together with the electric wire constituting the communication circuit, and binds the electric wire and the power supply line.

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