JPS62237606A - I/o cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is used for inputting and outputting data signals between the main body of electronic meters, office automation equipment, and external equipment such as printers. 2. Description of the Related Art In general, this type of input/output cable is made up of multiple pairs of polyvinyl chloride insulated cables with insulation displacement connectors attached to both ends or one end. For example, this cable consists of a strand of seven conductors with an outer diameter of 0.127 mm and a wire of approximately 0.3 mm in diameter.
It is coated with polyvinyl chloride to a thickness of 5 mm and has an outer diameter of about 1.05 mm. Figure 1 shows this input/output cable 10.
The input/output cable 10 is made up of a stranded body 14 of a plurality of insulated wires 11 (see FIG. 1A) insulated with polyvinyl chloride, and a sheath 16 provided on its H. It consists of This pressure connector 1
2, both ends of the input/output cable 10 must be
As shown in the figure, an insulator 1 fills the conductor 11b by heating and melting the insulation coating 11a of the insulated wire 11 using a heat press or the like.
1' and a flat form together with the backing tape 18, the spacing between adjacent conductors 11b is approximately 1.27 mm, and as shown in FIG.
The blade 12A bites into the insulator 11' through this gap, and the pressure connector 12 is connected. The thickness of this flat portion 10A is approximately 0.95 mm. Insulating liquid 1'a
The reason why the outer diameter of conductor 11a is approximately 1.05 mm is that it is heat-sealed into a flat shape, and the pitch of conductor 11b is set to 1.27 m.
This is because it is necessary to make m. On the other hand, recently electronic computers and office automation equipment have become significantly smaller.
Along with this, input/output cables are also required to be made smaller in diameter. In order to reduce the diameter of the input/output cable, it is necessary to make the insulation coating 11a thinner, but in this way, it is not possible to deform it into a flat shape as shown in Figure 2, or to obtain a predetermined conductor stranding pitch. Even if it were thermally deformed into a flat shape, there was a risk that the conductor strands would be exposed. For this reason, as shown in FIG. 4, the flat portion 10A is formed by heat-sealing the insulated wire 11 so as to sandwich it between upper and lower heat-sealing tapes 20, 20'. However, this heat fusion is 1
Since the process is performed by heating at a temperature of 20 to 160 degrees Celsius, if the heat resistance is low, the insulation coating will break and the conductor pitch will become unstable, resulting in a decrease in quality and an unavoidable decrease in mechanical strength. .

(Objective of the Invention) The object of the present invention is to prevent the mechanical strength from decreasing even when the outer covering is made thin, and to prevent breakage of the insulation covering and disturbance of the conductor pitch when heat-sealing it into a flat shape. Our goal is to provide an input/output cable that eliminates the need for damage.

(Structure of the Invention) The input/output cable according to the present invention consists of a twisted combination of a plurality of insulated wires and an outer jacket applied on the twisted combination, and the insulator of the insulated wire has a thickness of 0°15 mm. The tensile strength is 2 below
．． It is characterized by being made of crosslinked semi-rigid polyvinyl chloride with a weight of 5 kg/mm2 or more.

In this way, the heat resistance is improved by crosslinking the polyvinyl chloride, and the mechanical strength is improved by making the semi-rigid polyvinyl chloride with a tensile strength of 2.5 kg/mmZ, so that it can be heat-fused in a flat shape. This makes it possible to achieve a thinner diameter by setting the thickness to 0.15 mm or less.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 34, a braided shield layer 36 of tin-plated annealed copper wire applied to the twisted body 34, and a polyvinyl chloride jacket 38 applied to the shield layer 36.

Each insulated wire 32 is as shown in FIG. 5A.

A conductor 32a and an insulating coating 3 applied on the conductor 32a
It consists of 2b. The insulating liquid WXI32'b is made of crosslinked semi-rigid polyvinyl chloride with a thickness of 0.15 mm or less and a tensile strength of 2.5 kg/mm2 or more. When the thickness of the insulating liquid rII 32b is set to 0.15 mm or less in this way, the diameter of the insulated wire 32 can be reduced, and the entire input/output cable 30 can also be reduced in diameter. When thinner, mechanical strength decreases. For this reason, the tensile strength of the insulating liquid [32b]
2.5 kg/ when evaluated according to C3005-16
By using semi-rigid polyvinyl chloride with a diameter of mm- or more, a decrease in mechanical strength is prevented. In addition, when the ends of this input/output cable 30 are heat-sealed as shown in FIG. 4, they are pressurized at a temperature of 120 to 160°C, but semi-rigid polyvinyl chloride is crosslinked to improve heat resistance. - This crosslinking can be carried out by irradiating semi-rigid polyvinyl chloride with electrons.

Next, to give a specific example of the input/output cable of the present invention, the conductor 32a is a stranded wire (28 AWG) made by twisting seven tin-plated wires with a diameter of 0.127 mm, and the insulation coating is semi-hard. Polyvinyl chloride was applied to a thickness of 0.1 mm to have an outer diameter of 0°58 mm, and then irradiated with an electron beam to obtain crosslinked semi-rigid polyvinyl chloride. The insulated wires thus formed were twisted into 25 pairs using 50 fibers, and a polyvinyl chloride jacket was applied to the wires to form an input/output cable. The outer diameter of this cable was about 7.5 mm, which was about 60% of the outer diameter of a conventional polyvinyl chloride insulated cable. As shown in Figure 4, both ends of this cable are sandwiched between a back reinforcing tape made by laminating a polyvinyl chloride tape with a thickness of about 0.2 mm, a polyester tape with a thickness of 25 μm, and a polyvinyl chloride tape with a thickness of about 50 gm. Pitch 1.27m
After the two tapes were heat-sealed to each other using a heat press so as to be integrated, a press-contact connector was connected as shown in FIG. Even when heat fused in this way, the insulation coating was not damaged because it was formed of crosslinked semi-rigid polyvinyl chloride and had heat resistance.

Because this cable has a thin insulation coating, its characteristic impedance is approximately 55Ω when used as an unbalanced circuit, which is lower than the approximately 80Ω of a conventional cable with an outer diameter of 1.05mm of polyvinyl chloride insulation coating. However, it could be used satisfactorily for wiring to office automation equipment such as printers. Furthermore, since the cable of the present invention has a tensile strength of 2.5 kg/mm2 or more, the cable of the present invention can withstand large external forces and has sufficiently satisfactory mechanical properties.

In other embodiments, the conductor 32a is tin-plated.
Annealed copper wire (30AWG) with FnW of 0.254mm, and insulation coating of semi-hard polyvinyl chloride with a thickness of 0.15m.
m to give an outer diameter of 0.55 mm, and irradiated with an electron beam to obtain crosslinked semi-rigid polyvinyl chloride. The insulated wires thus formed were twisted into 15 pairs using 30 fibers.

A braided shield layer of tin-plated mild steel wire was applied to the north of this, and an outer jacket of polyvinyl chloride was applied to this to a thickness of about 0.9 mm to form an input/output cable.

The outer diameter of this cable was about 7.2 mm, which was about 70% of the outer diameter of a conventional polyvinyl chloride insulated cable. Also,
The characteristic impedance of this cable was approximately 70Ω when used as an unbalanced circuit.

(Effects of the Invention) According to the present invention, as described above, it is possible to reduce the overall diameter of the cable by thinning the insulation coating of the insulated wire, so that it is possible to respond to miniaturization of equipment. In addition, the insulation coating has excellent heat resistance, so even if the insulation coating is heat-fused during terminal processing, the insulation coating will not be torn or the conductor pitch will be disturbed, ensuring a reliable connection to the pressure welding connector. However, since the mechanical strength is not reduced, it has the practical benefit of being able to sufficiently withstand external forces.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an example of the use of an input/output cable, Fig. 1A is a cross-sectional view of one conventional insulated wire, Fig. 2 is an enlarged cross-sectional view of the end treatment section of the input/output cable, and Fig. 3 The figure is an enlarged cross-sectional view of a part of the end-processed portion with a pressure welding connector connected to it, FIG. 4 is an enlarged cross-sectional view of another end-processed portion, and FIG. 85 is a cross-sectional view of the input/output cable according to the present invention. The top view and FIG. 5A are cross-sectional views of the electric wire used in the present invention. 30--Person output cable, 32--Insulated wire, 32 a--One conductor, 32b--Insulation coating, 34--One twisted combination, 38-- -- Outer covering. fi/ Figure 10A 153 Dialogue/A Figure 12A /8 41st Procedure Person 13. zEng (1 shot) 1986 12J] / 70 Commissioner of the Patent Office Mr. Kuro Ill II Male■,・J1 Display Patent Application No. 1981-78179 2, Name of Invention Input/Output Cable 3, Make amendments Patent Applicant (529) Furukawa Electric Co., Ltd. 4, Agent Room 302, Nihonbashi Chuo Building, 4-8 Nippon Tachibanagi-cho, Chuo-ku, Tokyo Telephone 1.669-7:19
5 (6446) Patent Attorney Arata Kikuchi-゛ ・ Pa, j 5. Column ``Name of the invention'' in the application subject to amendment, Column 1 of detailed explanation of the invention in the specification j-16, Contents of the amendment °゛'ゞ(1) Correct the application as shown in the attached sheet. (2) Correct the r-twisted wire pitch 1 on page 3, line 11 of the specification to "r spacing pitch." (2) Page 3, line 18, page 4, line 4 of the same book. Correct “conductor pitch” on page 6, line 7, page 7, line 7, and page 9, line 4 to “r conductor pitch.” (3) “Next to tape j” on page 7, line 4 of the same book. Insert "r20". (4) Next to "r reinforcing tape" in page 7, line 6 of the same book, r20
' and insert 1. (5) There was no r on page 7, line 12 of the same book. '', insert the following statement. In the above, if sufficient adhesive strength can be obtained between the back side reinforcing tape 20' and the crosslinked semi-rigid polyvinyl chloride 32b, it is not necessary to apply the first front side tape 2o. 1 or more”d

Claims (1)

[Claims] In an input/output cable consisting of a twisted combination of a plurality of insulated wires and a jacket applied on the twisted combination, the insulator of the insulated wire has a thickness of 0.15 mm or less and a tensile strength of 2.5 mm.
An input/output cable characterized by being made of cross-linked semi-rigid polyvinyl chloride with a weight of 5 kg/mm^2 or more.