An optical and electrical composite cable

Abstract

The present invention discloses an optical and electrical composite cable. The cable core of the composite cable is composed of a group of electrical signal parallel wire pairs and a group of optical signal parallel wire pairs that are bundled together by an outer tape layer. The electrical signal parallel wire pairs are mainly composed of two insulated wire cores that are bundled together by an inner shielding layer and have a waist-shaped hole contour on the outer contour of the cross-section. The optical signal parallel wire pairs are composed of two tightly jacketed optical fibers that are bundled together by an inner tape layer and have a waist-shaped hole contour on the outer contour of the cross-section. The cross-section of the cable core has a rectangular structure inscribed in a circle, and there are combined gaps inside the electrical signal parallel wire pairs and the optical signal parallel wire pairs respectively. There is a combined gap between the outer tape layer and the electrical signal parallel wire pairs and / or the optical signal parallel wire pairs. The present invention has the characteristics of simple structure, small structural volume, low manufacturing cost, and good flexibility, and is suitable for application inside computer rooms and cabinets with narrow internal spaces and delicate requirements for wiring structures.

Description

Technical Field

[0001] The present invention relates to a cable, and more particularly to a composite cable having optical signal and electrical signal transmission functions. Background Art

[0002] An optical and electrical composite cable is a multi-functional cable that integrates optical signal (i.e., communication function) and electrical signal (i.e., conductive function) transmission. It is beneficial for simplifying the cable layout structure at the application site and reducing electromagnetic interference between optical signal and electrical signal transmissions.

[0003] Currently, common optical and electrical composite cables are formed in a flat or dumbbell shape. For example, "A New Type of Optoelectronic Integrated Cable and Its Preparation Method" (publication number: CN 102063965, publication date: May 18, 2011), "A New Type of Low-Smoke, Halogen-Free, Flame-Retardant Optoelectrical Composite Cable" (publication number: CN 203415300, publication date: January 29, 2014), etc. disclosed in Chinese patent documents. The structural volume of such optical and electrical composite cables is relatively large and is not suitable for use inside computer rooms and cabinets (such as telecommunications data exchange centers) with narrow internal spaces and delicate cable layout requirements.

[0004] In addition, after the applicant's search, it was found that Chinese patent documents also disclose an optical and electrical composite cable with a relatively round structure. For details, see "A Manufacturing Method of a Double-Core Composite Audio Cable" (publication number: CN 113053575, publication date: June 29, 2021). Although this technology discloses a cable that integrates optical signal and electrical signal transmission functions in a relatively round structure, on the one hand, the cable forming structure design is complex, and the manufacturing technology difficulty and cost are both high; on the other hand, a variety of (or multiple groups) filling cores are filled inside the cable core (including inside the conductive unit and inside the light guiding unit). Under the influence of the filling cores, the cable core is a solid core structure with relatively high hardness, not soft, and relatively large size, resulting in a relatively large and not soft structural volume of the formed optical and electrical composite cable, which is not suitable for use inside computer rooms and cabinets with narrow internal spaces and delicate cable layout requirements. Summary of the Invention

[0005] The technical object of the present invention is: in view of the particularity of the above-mentioned optical and electrical composite cable and the deficiencies of the prior art, to provide an optical and electrical composite cable with a simple structure, small structural volume, low manufacturing cost, good flexibility, and suitable for use inside computer rooms and cabinets with narrow internal spaces and delicate cable layout requirements.

[0006] The technical object of the present invention is achieved by the following technical solution. An optical and electrical composite cable, the cable core of the composite cable is composed of a group of electrical signal parallel wire pairs and a group of optical signal parallel wire pairs that are bundled together by an outer tape layer and arranged side by side. The electrical signal parallel wire pairs are mainly composed of two insulated wire cores that are bundled together by an inner shielding layer and arranged side by side, and the outer contour of the cross-section is in the shape of a waist-shaped hole contour. The optical signal parallel wire pairs are composed of two tightly jacketed optical fibers that are bundled together by an inner tape layer and arranged side by side, and the outer contour of the cross-section is in the shape of a waist-shaped hole contour. The cross-section of the cable core is in the shape of a rectangle inscribed in a circle, and there are combined gaps inside the electrical signal parallel wire pairs and the optical signal parallel wire pairs respectively. There is a combined gap between the outer tape layer and the electrical signal parallel wire pairs and / or the optical signal parallel wire pairs. This technical measure tightly arranges the electrical signal parallel wire pairs and the optical signal parallel wire pairs with basically the same outer contour of the cross-section in a basically symmetrical manner, so as to form a composite cable with a relatively stable and relatively round structure, integrating the functions of optical signal and electrical signal transmission. And the combined gaps are naturally left inside the cable core to naturally guide the extrusion pressure borne by each component of the cable core. In this way, it not only effectively reduces the electric field distortion, but also makes the structure of the cable core compact and small, and is also conducive to ensuring the flexibility of the cable core. Thus, the formed cable has a relatively round outer contour with a small structural volume and good flexibility, and is suitable for use inside computer rooms and cabinets with narrow internal spaces and delicate requirements for wire arrangement structures. In addition, the cable formed by this technical measure has the characteristics of simple structure, which is not only convenient for manufacturing and forming, but also can effectively reduce the manufacturing cost.

[0007] As one of the preferred solutions, the insulated wire core of the electrical signal parallel wire pair is composed of a conductor with a silver-plated copper wire structure and an insulating layer covering the conductor. Further, the conductor is a single silver-plated copper wire structure with a diameter of 0.3 - 0.5 mm. The thickness of the silver-plated layer on the surface of the conductor is 2 - 4 μm. The insulating layer is an extrusion structure of polytetrafluoroethylene material. The insulated wire core of this technical measure forms a specific structure silver-plated copper conductor with extremely low resistivity based on the skin effect of signal current, so as to reliably form the transmission of high-frequency digital signal current and achieve the technical effect of high-speed transmission. In addition, the smaller outer diameter size of the conductor is beneficial to the small size of the formed cable structure.

[0008] As one of the preferred solutions, the electrical signal parallel wire pair has a ground wire, and the ground wire is arranged between the two insulated wire cores by the inner shielding layer. This technical measure can not only form a safe grounding wiring, but also achieve a good electromagnetic shielding technical effect on the electrical signal parallel wire pair.

[0009] As one of the preferred solutions, the inner shielding layer is a wrapping structure of copper tape with an overlapping rate of 20-30%, and the thickness of the copper tape is 0.03-0.05 mm and the width is 2-3 times the outer diameter of the cable core. The inner shielding layer of this technical measure can form a good shielding effect on the electromagnetic interference of the electrical signal parallel pairs in the external environment, ensuring the stable transmission of signal current; in addition to the electromagnetic shielding effect, the forming structure of the inner shielding layer can better wrap and fit the outer surface of the electrical signal parallel pairs, so that it can not only effectively prevent excessive extrusion pressure on the electrical signal parallel pairs, but also form a stable shaping for the electrical signal parallel pairs.

[0010] As one of the preferred solutions, the tight-buffered optical fiber of the optical signal parallel pair is composed of a G.657 optical fiber and a tight-buffered layer covering the G.657 optical fiber. This technical measure can stably achieve the transmission of high-frequency optical signals.

[0011] As one of the preferred solutions, an outer shielding layer and a sheath layer are sequentially arranged from the inside to the outside of the outer tape layer. Further, the outer shielding layer is a closely wound and sparse structure of copper wires with a diameter of 0.5-0.8 mm; this technical measure forms a small and dense metal shielding structure outside the cable core, which can effectively shield the electromagnetic interference of the external environment and can effectively enhance the tensile strength along the longitudinal direction of the cable. The sheath layer is an extrusion structure of Teflon material; this technical measure can maintain good physical properties in harsh environments including severe temperature differences.

[0012] As one of the preferred solutions, the inner tape layer and the outer tape layer are respectively wrapping structures of polyester tape.

[0013] The beneficial technical effects of the present invention are as follows: The above technical measures closely arrange the electrical signal parallel pairs and the optical signal parallel pairs with basically the same outer contour of the cross-section in a basically symmetric manner, so as to form a composite cable with a relatively stable and relatively round structure, integrating the functions of optical signal and electrical signal transmission. And the extrusion pressure borne by each component of the cable core is naturally guided in the way of naturally retaining the combined gap inside the cable core. In this way, it not only effectively reduces the electric field distortion, but also makes the structure of the cable core compact and small, and is also conducive to ensuring the flexibility of the cable core. Thus, the formed cable forms a relatively round outer contour with a small structural volume, has good flexibility, and is suitable for use inside computer rooms and cabinets with narrow internal spaces and delicate requirements for the wiring structure; in addition, the cable formed by this technical measure has the characteristics of simple structure, which is not only convenient for manufacturing and forming, but also can effectively reduce the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the present invention.

[0015] The meanings of the codes in the figure: 1—parallel pair of electrical signal lines; 11—insulated wire core; 111—conductor; 112—insulation layer; 12—ground wire; 13—inner shielding layer; 2—parallel pair of optical signal lines; 21—tightly jacketed optical fiber; 211—G.657 optical fiber; 212—tight jacket layer; 22—inner wrapping tape layer; 3—outer wrapping tape layer; 4—outer shielding layer; 5—sheath layer. Detailed implementation manners

[0016] The present invention relates to a cable, specifically a composite cable with functions of transmitting optical signals and electrical signals. The main technical content of the present invention will be described in detail below with multiple embodiments. Among them, Embodiment 1 is combined with the accompanying drawings of the specification, that is Figure 1 to clearly and detailedly explain the technical solution content of the present invention; although other embodiments are not separately drawn, their main structures can still refer to the drawings of Embodiment 1.

[0017] It should be particularly noted here that the drawings of the present invention are schematic. In order to clarify the technical purpose of the present invention, unnecessary details have been simplified to avoid obscuring the technical solution contributed by the present invention to the prior art.

[0018] Embodiment 1

[0019] See Figure 1 As shown, the present invention includes a cable core, an outer shielding layer 4 and a sheath layer 5 sequentially coated on the outside of the cable core.

[0020] Specifically, the cable core has tightly arranged parallel pairs of electrical signal lines 1 and parallel pairs of optical signal lines 2.

[0021] The parallel pair of electrical signal lines 1 has two insulated wire cores 11 tightly arranged in a substantially parallel manner, and a ground wire 12 at a side gap between the two insulated wire cores 11.

[0022] Each insulated wire core 11 is composed of a conductor 111 with a single-wire structure of silver-plated copper wire with a diameter of about 0.5 mm, and an insulation layer 112 with an extruded structure of polytetrafluoroethylene coated on the outside of the conductor 111. The thickness of the silver plating layer on the surface of the conductor 111 formed by the above-mentioned silver-plated copper wire single wire is about 3 μm.

[0023] A copper strip with a thickness of about 0.04 mm and a width about 3 times the outer diameter of the cable core is selected as the formed copper strip of the inner shielding layer 13. The copper strip is wound around the outside of the two parallel insulated wire cores 11 and the ground wire 12 between the two insulated wire cores 11 at an overlapping rate of about 30% to form the inner shielding layer 13, and the inner shielding layer 13 tightens them. The two insulated wire cores 11 tightened by the inner shielding layer 13 and the ground wire 12 between the two insulated wire cores 11 form the parallel pair of electrical signal lines 1.

[0024] The cross-sectional outer contour of the electrical signal parallel wire pair 1 is basically in the shape of a waist-shaped hole, and there is an unfilled combined gap that naturally exists during tight wrapping inside the electrical signal parallel wire pair 1.

[0025] The optical signal parallel wire pair 2 has two tightly jacketed optical fibers 21 arranged closely side by side in a substantially parallel manner.

[0026] Each tightly jacketed optical fiber 21 is composed of a G.657 optical fiber 211 and a tight jacket layer 212 with a polytetrafluoroethylene extrusion structure coated on the outside of the G.657 optical fiber 211.

[0027] A polyester tape is selected as the forming material for the inner tape layer 22. The polyester tape is wound around the outside of the two tightly jacketed optical fibers 21 arranged side by side with an overlap rate of about 30% to form the inner tape layer 22, and the inner tape layer 22 tightens them. The two tightly jacketed optical fibers 21 tightened by the inner tape layer 22 together form the optical signal parallel wire pair 2.

[0028] The cross-sectional outer contour of the optical signal parallel wire pair 2 is basically in the shape of a waist-shaped hole, and there is an unfilled combined gap that naturally exists during tight wrapping inside the optical signal parallel wire pair 2. In addition, the cross-sectional length and width of the optical signal parallel wire pair 2 are basically similar to those of the above-mentioned electrical signal parallel wire pair 2, and the outer contour can basically form a left-right symmetric fit, which is beneficial to the circular formation of the cable core and enhanced stability.

[0029] The above-mentioned electrical signal parallel wire pair 1 and the above-mentioned optical signal parallel wire pair 2 are basically arranged closely side by side in a parallel manner, and the outer contour of the electrical signal parallel wire pair 1 and the optical signal parallel wire pair 2 arranged closely side by side is basically square-shaped (of course, irregular).

[0030] A polyester tape is selected as the forming material for the outer tape layer 3. The polyester tape is wound around the outside of the electrical signal parallel wire pair 1 and the optical signal parallel wire pair 2 arranged side by side with an overlap rate of about 30% to form the outer tape layer 3, and the outer tape layer 3 tightens them. The cross-section of the cable core formed after the outer tape layer 3 tightens the electrical signal parallel wire pair 1 and the optical signal parallel wire pair 2 is basically in the shape of an inscribed rectangle in a circle (of course, irregular).

[0031] There is an unfilled combined gap that naturally exists during tight wrapping between the outer tape layer 3 of the cable core and the electrical signal parallel wire pair 1 and / or the optical signal parallel wire pair 2 arranged closely side by side.

[0032] Outside the outer tape layer 3 of the above-mentioned cable core, an outer shielding layer 4 and a sheath layer 5 are sequentially arranged from inside to outside.

[0033] The outer shielding layer 4 is a closely wound structure of copper wires with a diameter of about 0.7 mm.

[0034] The sheath layer 5 is an extrusion structure of Teflon materials including polytetrafluoroethylene.

[0035] Example 2

[0036] The present invention includes a cable core, an outer shielding layer and a sheath layer successively coated outside the cable core.

[0037] Specifically, the cable core has electrically-signal parallel wire pairs and optically-signal parallel wire pairs arranged closely side by side.

[0038] The electrically-signal parallel wire pair has two insulated wire cores arranged closely side by side in a substantially parallel manner, and a ground wire located at a gap on one side between the two insulated wire cores.

[0039] Each insulated wire core is composed of a conductor with a single-wire structure of silver-plated copper wire with a diameter of about 0.4 mm, and an insulating layer with an extrusion structure of polytetrafluoroethylene coated outside the conductor. The thickness of the silver plating layer on the surface of the conductor formed by the silver-plated copper wire single wire is about 2 μm.

[0040] A copper strip with a thickness of about 0.05 mm and a width about twice the outer diameter of the cable core is selected as the formed copper strip of the inner shielding layer. The copper strip is wound around the outside of the two insulated wire cores arranged side by side and the ground wire located between the two insulated wire cores with an overlap rate of about 25% to form an inner shielding layer, and the inner shielding layer tightens them. The two insulated wire cores tightened by the inner shielding layer and arranged side by side, and the ground wire located between the two insulated wire cores form an electrically-signal parallel wire pair.

[0041] The outer contour of the cross-section of the electrically-signal parallel wire pair is substantially in the shape of a waist-shaped hole, and there is an unfilled combined gap that naturally exists during the tight wrapping inside the electrically-signal parallel wire pair.

[0042] The optically-signal parallel wire pair has two tightly jacketed optical fibers arranged closely side by side in a substantially parallel manner.

[0043] Each tightly jacketed optical fiber is composed of a G.657 optical fiber and a tight jacket layer with an extrusion structure of polytetrafluoroethylene coated outside the G.657 optical fiber.

[0044] A polyester tape is selected as the formed material of the inner wrapping tape layer. The polyester tape is wound around the outside of the two tightly jacketed optical fibers arranged side by side with an overlap rate of about 20% to form an inner wrapping tape layer, and the inner wrapping tape layer tightens them. The two tightly jacketed optical fibers tightened by the inner wrapping tape layer and arranged side by side form an optically-signal parallel wire pair.

[0045] The cross-sectional outer contour of the optical signal parallel line pair is basically in the shape of a waist-shaped hole, and there is an unfilled combined gap inside the optical signal parallel line pair that naturally exists when the cable is tightened and wrapped. In addition, the cross-sectional length and width of the optical signal parallel line pair are basically similar to the cross-sectional length and width of the electrical signal parallel line pair, which can basically make the outer contour symmetrical, which is conducive to rounding the cable core and enhancing stability.

[0046] The above-mentioned parallel pairs of electrical signal lines and the above-mentioned parallel pairs of optical signal lines are basically closely arranged side by side in a parallel manner, and the outer contours of the closely arranged parallel pairs of electrical signal lines and optical signal lines are basically square (of course irregular).

[0047] A polyester tape is selected as the molding material of the outer tape layer, and the polyester tape is wrapped around the outside of the parallel pairs of electrical signal lines and optical signal lines with an overlap rate of about 25% to form an outer tape layer, which tightens them. The cross section of the cable core formed after the outer tape layer tightens the parallel pairs of electrical signal lines and optical signal lines is basically a rectangular structure inscribed in a circle (of course, it is irregular).

[0048] There is an unfilled combined gap between the outer tape layer of the cable core and the closely arranged parallel wire pairs of electrical signals and / or parallel wire pairs of optical signals, which naturally exists when the coating is tightened.

[0049] An outer shielding layer and a sheath layer are arranged in sequence from the inside to the outside on the outside of the cable core.

[0050] The outer shielding layer is a tightly wound structure of copper wire with a diameter of about 0.5 mm.

[0051] The sheath layer is an extruded structure of Teflon material including polytetrafluoroethylene.

[0052] Example 3

[0053] The invention comprises a cable core, and an outer shielding layer and a sheath layer which are sequentially coated on the outside of the cable core.

[0054] Specifically, the cable core has parallel pairs of electrical signal lines and parallel pairs of optical signal lines that are closely arranged side by side.

[0055] The parallel wire pair of electrical signals has two insulated wire cores closely arranged side by side in a substantially parallel manner, and a ground wire located at a gap on one side between the two insulated wire cores.

[0056] Each insulated wire core is composed of a conductor of a silver-plated copper wire single wire structure with a diameter of about 0.3mm and an insulating layer of a polytetrafluoroethylene extruded structure wrapped outside the conductor. The surface silver plating layer thickness of the conductor formed by the silver-plated copper wire single wire is about 4μm.

[0057] Select a copper strip with a thickness of about 0.03 mm and a width about 3 times the outer diameter of the cable core as the formed copper strip for the inner shielding layer. This copper strip is wrapped around the outside of two parallel insulating wire cores and the ground wire located between the two insulating wire cores at an overlapping rate of about 25% to form an inner shielding layer, which bundles them tightly. The two insulating wire cores bundled tightly by the inner shielding layer and the ground wire located between the two insulating wire cores form an electrical signal parallel pair.

[0058] The outer contour of the cross-section of the electrical signal parallel pair is basically in the shape of a waist-shaped hole, and there are unfilled combined gaps that naturally exist during tight wrapping inside the electrical signal parallel pair.

[0059] The optical signal parallel pair has two tightly wrapped optical fibers closely arranged in a basically parallel manner.

[0060] Each tightly wrapped optical fiber is composed of a G.657 optical fiber and a tightly wrapped layer with a polytetrafluoroethylene extrusion structure coated on the outside of the G.657 optical fiber.

[0061] Select a polyester tape as the formed material for the inner tape layer. This polyester tape is wrapped around the outside of two parallel tightly wrapped optical fibers at an overlapping rate of about 30% to form an inner tape layer, which bundles them tightly. The two tightly wrapped optical fibers bundled tightly by the inner tape layer form an optical signal parallel pair.

[0062] The outer contour of the cross-section of the optical signal parallel pair is basically in the shape of a waist-shaped hole, and there are unfilled combined gaps that naturally exist during tight wrapping inside the optical signal parallel pair. In addition, the cross-sectional length and width of the optical signal parallel pair are basically similar to those of the above electrical signal parallel pair, and can basically make the outer contour form a left-right symmetric fit, which is beneficial for the cable core to become round and enhance stability.

[0063] The above electrical signal parallel pair and the above optical signal parallel pair are basically closely arranged in parallel. The outer contour of the closely arranged electrical signal parallel pair and optical signal parallel pair is basically square-shaped (of course, irregular).

[0064] Select a polyester tape as the formed material for the outer tape layer. This polyester tape is wrapped around the outside of the parallel electrical signal parallel pair and optical signal parallel pair at an overlapping rate of about 30% to form an outer tape layer, which bundles them tightly. The cross-section of the cable core formed after the outer tape layer bundles tightly the electrical signal parallel pair and the optical signal parallel pair is basically in the shape of an inscribed rectangle in a circle (of course, irregular).

[0065] There are unfilled combined gaps that naturally exist during tight wrapping between the outer tape layer of the cable core and the electrical signal parallel pair and / or optical signal parallel pair that are closely arranged in parallel.

[0066] Outside the outer wrapping tape layer of the above-mentioned cable core, an outer shielding layer and a sheath layer are sequentially arranged from inside to outside.

[0067] The outer shielding layer is a closely wound and sparsely wound structure of copper wires with a diameter of about 0.8 mm.

[0068] The sheath layer is an extruded structure of Teflon materials including polytetrafluoroethylene.

[0069] Embodiment 4

[0070] The present invention includes a cable core, an outer shielding layer and a sheath layer sequentially coated outside the cable core.

[0071] Specifically, the cable core has closely arranged parallel pairs of electrical signal lines and parallel pairs of optical signal lines.

[0072] The parallel pair of electrical signal lines has two insulated wire cores closely arranged in a substantially parallel manner.

[0073] Each insulated wire core is composed of a conductor with a single-wire structure of silver-plated copper wire with a diameter of about 0.4 mm, and an insulating layer with an extruded structure of polytetrafluoroethylene coated outside the conductor. The thickness of the silver plating layer on the surface of the conductor formed by the single silver-plated copper wire is about 3 μm.

[0074] A copper tape with a thickness of about 0.05 mm and a width about 2.5 times the outer diameter of the cable core is selected as the forming copper tape of the inner shielding layer. The copper tape is wound around the outside of the two parallel insulated wire cores with an overlapping rate of about 25% to form an inner shielding layer, and the inner shielding layer tightens them. The two insulated wire cores tightened together by the inner shielding layer form a parallel pair of electrical signal lines.

[0075] The outer contour of the cross-section of the parallel pair of electrical signal lines is substantially in the shape of a waist-shaped hole, and there is an unfilled combined gap that naturally exists during tight wrapping inside the parallel pair of electrical signal lines.

[0076] The parallel pair of optical signal lines has two tightly wrapped optical fibers closely arranged in a substantially parallel manner.

[0077] Each tightly wrapped optical fiber is composed of a G.657 optical fiber and a tightly wrapped layer with an extruded structure of polytetrafluoroethylene coated outside the G.657 optical fiber.

[0078] A polyester tape is selected as the forming material of the inner wrapping tape layer. The polyester tape is wound around the outside of the two parallel tightly wrapped optical fibers with an overlapping rate of about 25% to form an inner wrapping tape layer, and the inner wrapping tape layer tightens them. The two tightly wrapped optical fibers tightened together by the inner wrapping tape layer form a parallel pair of optical signal lines.

[0079] The cross-sectional outer contour of the optical signal parallel line pair is basically in the shape of a waist-shaped hole, and there is an unfilled combined gap inside the optical signal parallel line pair that naturally exists when the cable is tightened and wrapped. In addition, the cross-sectional length and width of the optical signal parallel line pair are basically similar to the cross-sectional length and width of the electrical signal parallel line pair, which can basically make the outer contour symmetrical, which is conducive to rounding the cable core and enhancing stability.

[0080] The above-mentioned parallel pairs of electrical signal lines and the above-mentioned parallel pairs of optical signal lines are basically closely arranged side by side in a parallel manner, and the outer contours of the closely arranged parallel pairs of electrical signal lines and optical signal lines are basically square (of course irregular).

[0081] A polyester tape is selected as the molding material of the outer tape layer, and the polyester tape is wrapped around the outside of the parallel pairs of electrical signal lines and optical signal lines with an overlap rate of about 25% to form an outer tape layer, which tightens them. The cross section of the cable core formed after the outer tape layer tightens the parallel pairs of electrical signal lines and optical signal lines is basically a rectangular structure inscribed in a circle (of course, it is irregular).

[0082] There is an unfilled combined gap between the outer tape layer of the cable core and the closely arranged parallel wire pairs of electrical signals and / or parallel wire pairs of optical signals, which naturally exists when the coating is tightened.

[0083] An outer shielding layer and a sheath layer are arranged in sequence from the inside to the outside on the outside of the cable core.

[0084] The outer shielding layer is a tightly wound structure of copper wire with a diameter of about 0.6 mm.

[0085] The sheath layer is an extruded structure of Teflon material including polytetrafluoroethylene.

[0086] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0087] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. An optical and electrical composite cable, wherein the cable core of the composite cable is composed of a group of electrical signal parallel wire pairs (1) and a group of optical signal parallel wire pairs (2) that are bundled together and arranged side by side by an outer tape layer (3), and there is a combined gap between the outer tape layer (3) and the electrical signal parallel wire pairs (1) and / or the optical signal parallel wire pairs (2); It is characterized in that: The parallel pair of electrical signal lines (1) is mainly composed of two insulated wire cores (11) bundled together by an inner shielding layer (13), and the outer contour of the cross-section is in the shape of a waist-shaped hole. There is a combined gap inside the parallel pair of electrical signal lines (1). The inner shielding layer (13) is a wrapping structure of copper tape with an overlapping rate of 20-30%, and the thickness of the copper tape is 0.03-0.05 mm and the width is 2-3 times the outer diameter of the cable core. The parallel pair of optical signal lines (2) is composed of two tightly jacketed optical fibers (21) bundled together by an inner tape layer (22), and the outer contour of the cross-section is in the shape of a waist-shaped hole. There is a combined gap inside the parallel pair of optical signal lines (2). In the cable core structure composed of the parallel pair of electrical signal lines (1) and the parallel pair of optical signal lines (2) bundled together by the outer tape layer (3), the cross-sectional length and width of the parallel pair of optical signal lines (2) respectively correspond to the cross-sectional length and width of the parallel pair of electrical signal lines (1). The outer contours of the parallel pair of electrical signal lines (1) and the parallel pair of optical signal lines (2) form a left-right symmetric fit, making the cross-section of the cable core in the shape of an inscribed rectangle in a circle.

2. The optical and electrical composite cable according to claim 1, characterized in that: The insulated wire core (11) of the parallel pair of electrical signal lines (1) is composed of a conductor (111) with a silver-plated copper wire structure and an insulating layer (112) covering the conductor (111).

3. The optical and electrical composite cable according to claim 2, characterized in that: The conductor (111) is a single silver-plated copper wire structure with a diameter of 0.3-0.5 mm.

4. The optical and electrical composite cable according to claim 2 or 3, characterized in that: The thickness of the silver-plated layer on the surface of the conductor (111) is 2-4 μm.

5. The optical and electrical composite cable according to claim 1 or 2, characterized in that: The parallel pair of electrical signal lines (1) has a ground wire (12), and the ground wire (12) is arranged between the two insulated wire cores (11) covered by the inner shielding layer (13).

6. The optical and electrical composite cable according to claim 1, characterized in that: The tightly jacketed optical fiber (21) of the parallel pair of optical signal lines (2) is composed of a G.657 optical fiber (211) and a tightly jacketed layer (212) covering the G.657 optical fiber (211).

7. The optical and electrical composite cable according to claim 1, characterized in that: Outside the outer tape layer (3), an outer shielding layer (4) and a sheath layer (5) are sequentially arranged from inside to outside.

8. The optical and electrical composite cable according to claim 7, characterized in that: The outer shielding layer (4) is a tightly and sparsely wound structure of copper wires with a diameter of 0.5-0.8 mm.

9. The optical and electrical composite cable according to claim 7, characterized in that: The sheath layer (5) is an extrusion structure of Teflon material.

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