Coaxial flat cable

Abstract

[Problem] To provide a coaxial flat cable with which stable high frequency transmission characteristics can be realized, with respect to a structure in which stress is not applied to a specific coaxial cable when the coaxial flat cable is being handled. [Solution] The above problem is solved by a coaxial flat cable 20 comprising a plurality of coaxial cables 10 arranged side by side along a width direction X, and a resin tape 11 with which at least end sections 21 of the coaxial cables 10 are integrated from one or both surface(s), each of the plurality of coaxial cables 10 being connected by soldering to a substrate 30 or a connector, wherein the resin tape 11 positioned at the end sections 21 is configured so that a fixed section 21a which is fixed to the substrate or the connector is provided at both end sections in the width direction X.

Description

Technical Field

[0001] The present invention relates to a coaxial flat cable, and more particularly to a coaxial flat cable used inside or between electronic devices such as liquid crystal televisions and servers, and designed so that no stress is applied to a specific coaxial cable during handling or the like.

Background Art

[0002] Flat cables are excellent in processability and flexibility and are widely used as internal and external wiring materials for electronic devices. In particular, as a flat cable suitable for the propagation of high-frequency signals, a coaxial flat cable using a plurality of coaxial cables has been proposed. For example, Patent Document 1 proposes a coaxial flat cable having a large center conductor diameter and a small finished outer diameter, and exhibiting stable high-frequency characteristics. This coaxial flat cable is a coaxial flat cable having a plurality of coaxial cables arranged in parallel at regular intervals and a fixing tape that integrates at least the terminal portions of the plurality of coaxial cables from one side or both sides. The coaxial cable includes at least a center conductor, a dielectric layer provided on the outer periphery of the center conductor and having a longitudinally continuous gap portion, an outer conductor provided on the outer periphery of the dielectric layer, and an insulating layer provided on the outer periphery of the outer conductor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the coaxial cable that constitutes the above-described conventional coaxial flat cable, the outer conductor and the center conductor are each soldered to the substrate. However, when stress is applied to a specific coaxial cable due to handling after soldering or the like, the stress concentrates on the soldered portions of the outer conductor and the center conductor, and there is a risk of damage at the soldered portions. Damage at the soldered portions causes a problem that the high-frequency transmission characteristics of the coaxial flat cable deteriorate.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a coaxial flat cable in which stress is not applied to a specific coaxial cable even by handling the coaxial flat cable or the like.

Means for Solving the Problems

[0006] The coaxial flat cable according to the present invention includes a plurality of coaxial cables arranged side by side in the width direction, and a resin tape that is bonded to one side or both sides of at least the terminal portions of the plurality of coaxial cables to integrate the terminal portions. Each of the plurality of coaxial cables is a coaxial flat cable that is soldered to a substrate or a connector, and the resin tape located at the terminal portion among the resin tapes has fixing portions fixed to the substrate or the connector provided at both ends in the width direction.

[0007] According to this invention, among the resin tapes bonded from at least one side or both sides of the terminal portion, the resin tape located at the terminal portion has fixing portions (locking, fitting, crimping, caulking, etc.) fixed to the substrate or the connector provided at both ends in the width direction. Therefore, the applied stress can be received by the entire resin tape, and stress can be prevented from being applied to a specific coaxial cable. As a result, stress concentration on the soldered portions of a specific outer conductor and center conductor is eliminated, and damage at the soldered portions can be prevented. Note that “at least” means that a resin tape is always provided at the terminal portion, but a resin tape may also be provided at an intermediate portion other than the terminal portion.

[0008] In the coaxial flat cable according to the present invention, the fixing portion is a hole or a protrusion that is fitted into a fitting portion provided in the substrate or the connector.

[0009] According to this invention, since the fixing portion is a hole or a protrusion, the hole or the protrusion is fitted into the fitting portion provided in the substrate or the connector, and the coaxial flat cable is fixed to the substrate or the connector.

[0010] In the coaxial flat cable according to the present invention, the fixing portion is a notch that is fitted into a fitting portion provided in the substrate or the connector.

[0011] According to this invention, since the fixing portion is a notch, the notch is fitted into the fitting portion provided in the substrate or the connector, and the coaxial flat cable is fixed to the substrate or the connector.

[0012] In the coaxial flat cable according to the present invention, (1) when the resin tape is a cover tape that sandwiches the plurality of coaxial cables from both sides and integrates them, the convex portion or the concave portion is provided on the cover tape. (2) When the resin tape is a reinforcing tape provided at the terminal portions of the plurality of coaxial cables, the convex portion or the concave portion is provided on the reinforcing tape. (3) When the resin tape is a cover tape that sandwiches the plurality of coaxial cables from both sides and integrates them and a reinforcing tape that is bonded to one side of the cover tape at the terminal portions of the plurality of coaxial cables, the convex portion or the concave portion is provided at the bonding portion of the cover tape and the reinforcing tape.

[0013] According to these inventions, when the resin tape is a cover tape, a reinforcing tape, or a combination of a cover tape and a reinforcing tape, the fixing portion is provided on them, so that the coaxial flat cable is fixed to the substrate or the connector.

[0014] In the coaxial flat cable according to the present invention, the coaxial cable includes at least a central conductor, an insulator provided on the outer periphery of the central conductor, an outer conductor provided on the outer periphery of the insulator, and an outer covering provided on the outer periphery of the outer conductor, and the portions soldered to the substrate or the connector are the central conductor and the outer conductor. In this case, the insulator has any one of a solid structure, a hollow structure, and a foamed structure, and preferably has a hollow structure.

[0015] According to the present invention, stress concentration on specific central conductors and outer conductors soldered to a substrate or a connector is eliminated, and breakage at the soldered connection portion can be prevented.

Effects of the Invention

[0016] According to the present invention, it is possible to provide a coaxial flat cable that is used inside or between electronic devices such as liquid crystal televisions and servers, and in which stress is not applied to a specific coaxial cable even by handling the coaxial flat cable. In particular, since the applied stress can be received by the entire resin tape, stress can be prevented from being applied to a specific coaxial cable, so stress concentration on the soldered connection portions of specific outer conductors and central conductors is eliminated, and breakage at the soldered connection portions can be prevented.

Brief Description of the Drawings

[0017]

Figure 1

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Figure 8

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Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

[0018] Embodiments of the coaxial flat cable according to the present invention will be described with reference to the drawings. Note that the present invention includes inventions having the same technical idea as the embodiments described below and the forms described in the drawings, and the technical scope of the present invention is not limited only to the descriptions of the embodiments and the drawings.

[0019] As shown in FIGS. 1 to 6, the coaxial flat cable 20 according to the present invention has a plurality of coaxial cables 10 arranged side by side in the width direction X, and a resin tape 11 that integrally adheres to at least the terminal portions 21 of the plurality of coaxial cables 10 from one side or both sides. Each of the plurality of coaxial cables 10 is a coaxial flat cable 20 that is soldered to a substrate 30 or a connector (not shown). Among the resin tapes 11, the resin tape 11 located at the terminal portion 21 is characterized in that fixing portions 21a for fixing (locking, fitting, crimping, caulking, etc.) to the substrate 30 or the connector are provided at both ends in the width direction X.

[0020] In this coaxial flat cable 20, among the resin tapes 11 that are adhered from at least one side or both sides of the terminal portion 21, the resin tape 11 located at the terminal portion 21 has fixing portions 21a for fixing (locking, fitting, crimping, caulking, etc.) to the substrate 30 or the connector provided at both ends in the width direction X. Therefore, the applied stress can be received by the entire resin tape, and stress can be prevented from being applied to a specific coaxial cable 10. As a result, stress concentration on the solder joints 42 and 41 of the specific outer conductor 3 and the center conductor 1 is eliminated, and breakage at the solder joints 42 and 41 can be prevented. Note that "at least" means that the resin tape 11 is always provided at the terminal portion 21, but the resin tape 11 may also be provided at the intermediate portion 22 other than the terminal portion.

[0021] Hereinafter, each component of the coaxial flat cable will be described.

[0022] <Coaxial Cable> The coaxial cable 10 constitutes the coaxial flat cable 20, and as shown in FIGS. 1 to 6, a plurality of them are arranged side by side in the width direction X. As shown in FIG. 8, the coaxial cable 10 includes at least a center conductor 1, an insulator 2 provided on the outer periphery of the center conductor 1, an outer conductor 3 provided on the outer periphery of the insulator 2, and an outer jacket 4 provided on the outer periphery of the outer conductor 3. And, as shown in FIGS. 10 to 13, the parts of the coaxial cable 10 that are soldered to the electrodes 31, 32 of the substrate 30 or the connector are the center conductor 1 and the outer conductor 3.

[0023] (Center conductor) As shown in FIGS. 8(A) and 8(B), the center conductor 1 is composed of a single wire extending in the longitudinal direction Y of the coaxial cable 10, or is composed of a plurality of wires twisted together. The type of the wire is not particularly limited as long as it is made of a highly conductive metal, but highly conductive metal conductors such as copper wire, copper alloy wire, aluminum wire, aluminum alloy wire, copper-aluminum composite wire, etc., or those with a plating layer on their surfaces can be preferably mentioned. From the viewpoint of high frequency, copper wire and copper alloy wire are particularly preferable. As the plating layer, a solder plating layer, a tin plating layer, a gold plating layer, a silver plating layer, a nickel plating layer, etc. are preferable. The cross-sectional shape of the wire is not particularly limited either, and it may be circular or substantially circular in cross-sectional shape, or may be angular.

[0024] The cross-sectional shape of the center conductor 1 is not particularly limited either. It may be circular (including elliptical) or rectangular, etc., but circular is preferable. The outer diameter of the center conductor 1 is desirably as large as possible so that the electrical resistance (alternating current resistance, conductor resistance) is small, but in order to reduce the final outer diameter of the coaxial cable 10, for example, it can be in the range of about 0.09 to 1 mm. An insulating film (not shown) may be provided on the surface of the center conductor 1 as needed. The type and thickness of the insulating film are not particularly limited, but for example, those that decompose well during soldering are preferable, and a thermosetting polyurethane film, etc. can be preferably mentioned.

[0025] (Insulator) As shown in Fig. 8, the insulator 2 is a low dielectric constant insulating layer continuously provided in the longitudinal direction on the outer periphery of the center conductor 1. The material of the insulator 2 is not particularly limited and is arbitrarily selected according to the required impedance characteristics. For example, fluorine-based resins with a low dielectric constant of 2.0 to 2.5 such as PFA (ε2.1), ETFE (ε2.5), FEP (ε2.1), etc. are preferred, and among them, PFA resin is preferred. Note that a colorant may be contained in the material of the insulator 2. The thickness of the insulator 2 is not particularly limited and is arbitrarily selected according to the required impedance characteristics, but it is preferably in the range of about 0.15 to 1.5 mm, for example. The forming method of the insulator 2 is not particularly limited, but any of a solid structure, a hollow structure, and a foamed structure can be easily formed by extrusion.

[0026] The insulator 2 may have a solid structure shown in Fig. 8(A), a hollow structure shown in Fig. 8(B), or a foamed structure (not shown). The hollow structure has a void portion 2A inside the structure body, and for example, the void portion 2A can have a cross-sectional form surrounded by an inner annular portion 2B, an outer annular portion 2C, and a connecting portion 2D. When the hollow structure or the foamed structure is adopted, there is an additional effect that the material density of the insulator 2 becomes small and the insulator 2 can be made soft. The void portion 2A is continuously provided in the insulator 2, and its form may be circular or rectangular and is not particularly limited. Such a hollow-structured insulator 2 has excellent side pressure strength, so it is not easily crushed during the manufacture of the coaxial cable 10 and the coaxial flat cable 20 or during the wiring work of the coaxial flat cable 20, etc., and the high-frequency characteristics can be made stable. Note that the hollow-structured insulator 2 can be formed by resin extrusion on the outer periphery of the center conductor 1 running through the extrusion die. The thicknesses of the inner annular portion 2B, the outer annular portion 2C, and the connecting portion 2D are not particularly limited, but are, for example, in the range of about 0.01 mm to 0.05 mm, and the outer diameter of the formed hollow-structured insulator 2 can be, for example, in the range of about 0.4 mm to 1.0 mm.

[0027] (Outer Conductor) The outer conductor 3 is provided on the outer periphery of the insulator 2, and may be a braided thin wire, a horizontally wound wire, a metal layer-attached insulating tape (such as a polyethylene terephthalate film with a copper layer), or a combination of both. In the example of FIG. 8, a horizontally wound thin wire 3A is provided on the outer periphery of the insulator 2, and an insulating tape 3B with a metal layer is further provided to cover it, but it is not limited to such a configuration. The thickness of the outer conductor 3 is not particularly limited, but is, for example, in the range of about 0.01 mm to 0.15 mm.

[0028] (Outer covering) The outer covering 4 is provided on the outer periphery of the outer conductor 3, and its material is not particularly limited as long as it is insulating. Preferably, as illustrated in FIG. 8, it can be configured by spirally winding an insulating tape 4A provided with an adhesive layer 4B on one side, but it is not limited to this form. As the adhesive layer 4B, various types applied to the coaxial cable 10 can be used, and preferably, for example, a polyester-based thermoplastic adhesive resin can be mentioned. As the insulating tape 4A, a polyester film such as a polyethylene terephthalate film or a polyethylene terephthalate film can be preferably mentioned. In particular, it is preferable to select a material with good adhesiveness to the resin tape 11 described later. For example, when the adhesive layer constituting the resin tape 11 is a polyester-based thermoplastic adhesive layer, the outer covering 4 is also preferably a polyester film.

[0029] (Others) The coaxial flat cable 20 may be provided with a shield layer (not shown) as required. The shield layer is provided, for example, on the resin tape 11 as shown in FIG. 1. Examples of the shield layer include a tape composed of at least a metal foil and a conductive adhesive layer provided on one surface of the metal foil, but the layer configuration is not particularly limited as long as it can exhibit a shielding function. The shield layer can also act to keep the capacitance and external inductance between the center conductor and the shield layer uniform, and prevent impedance mismatch in this part.

[0030] <Resin tape> The resin tape 11 forms a coaxial flat cable 20. As shown in FIGS. 1 to 7, at least the terminal portions 21 of a plurality of coaxial cables 10 arranged side by side in the width direction X are bonded together from one side or both sides to integrate the terminal portions 21. Examples of the resin tape 11 include a cover tape 11a, a reinforcing tape 11b, and a bonded portion 11c between the cover tape 11a and the reinforcing tape 11b, but are not limited thereto. "At least" means that the resin tape 11 (11a, 11b, 11c) is always provided on the terminal portion 21, but the resin tape 11 (11a) may also be provided on the intermediate portion 22 other than the terminal portion. Note that "both sides" refers to the upper and lower surfaces of a plurality of coaxial cables 10 arranged side by side in the width direction X as shown in FIGS. 7(A) and (C), and "one side" refers to one surface (for example, the lower surface) of a plurality of coaxial cables 10 arranged side by side in the width direction X as shown in FIG. 7(B).

[0031] The resin tape 11 shown in FIGS. 1, 3, 4, and 6 is provided as a cover tape 11a on the entire surface including the terminal portion 21 and the intermediate portion 22 of a plurality of coaxial cables 10. As shown in FIGS. 7(A) and (C), the two cover tapes 11a and 11a are provided so as to sandwich and cover the whole from both sides. In such a mode, the surface configuration of the cover tape 11a covering the coaxial cable 10 may be flat or may have irregularities, and the surface configuration (for example, the degree of flatness, the degree of irregularities, the degree of hardness, etc.) is preferably uniform in the longitudinal direction Y and the width direction X from the terminal portion 21 to the intermediate portion 22 and has no special processed portion. By doing so, a low-cost coaxial flat cable 20 that is easy to handle without special processing can be obtained.

[0032] (a) The resin tape 11 shown in FIGS. 2, 5, and 7(B) is a reinforcing tape 11b provided at the terminal portion 21 of a plurality of coaxial cables 10. In this example, fixing portions 21a are provided at both end portions in the width direction X of the reinforcing tape 11b. As shown in FIG. 2 and the like, the reinforcing tape 11b is provided only at the terminal portion 21 in the longitudinal direction Y of the plurality of coaxial cables 10, and the intermediate portion 22 is a non-integrated portion. The non-integrated portion allows the intermediate portion 22 to be easily deformed, improving the degree of freedom during wiring within the electronic device. The length of the reinforcing tape 11b in the longitudinal direction Y may be any length as long as it has at least the length where the protrusions 12, notches 13, holes 14, etc. are provided. For example, it is preferably about 5 to 20 mm.

[0033] (b) The resin tape 11 shown in FIGS. 3, 6, and 7(C) is composed of a cover tape 11a that sandwiches and integrates the entire plurality of coaxial cables from both sides, and a reinforcing tape 11b that is bonded to one side of the cover tape 11a at the terminal portion 21 of the plurality of coaxial cables 10. In this example, at the bonding portion 11c where the above-described cover tape 11a and the above-described reinforcing tape 11b are bonded together, fixing portions 21a are provided at both end portions in the width direction X. In this example, the cover tape 11a and the reinforcing tape 11b have the same configuration as described in (a) and (i).

[0034] (a) to (b), the above-described cover tape 11a and reinforcing tape 11b are usually composed of a base material and an adhesive layer. Regarding the cover tape 11a, the base material is not particularly limited, but a polyester film such as polyethylene terephthalate or polyethylene naphthalate can be preferably used. The thickness of the base material is arbitrarily selected within the range of about 0.025 mm to 0.1 mm. The adhesive layer is not particularly limited either, but it is desirable that it be a material that can be adhesively bonded to the outer covering 4 to be bonded, and for example, a polyester-based thermoplastic adhesive resin layer can be preferably mentioned. The thickness of the adhesive layer is arbitrarily selected within the range of about 0.02 mm to 0.035 mm.

[0035] Regarding the reinforcing tape 11b as well, the base material is not particularly limited, and polyester films such as polyethylene terephthalate and polyethylene naphthalate, and polycarbonate films can be preferably used. These base materials are also excellent in dimensional stability, and have the advantage that dimensional changes are unlikely to occur even when subjected to fitting forces applied during connection to the connector, or when the temperature changes or time passes. The thickness of the base material is arbitrarily selected within the range of about 0.025 mm to 0.3 mm. The adhesive layer is not particularly limited either, but it is desirable that it be a material that can be adhesively bonded to the outer cover 4 to be bonded, and examples thereof preferably include a polyester-based thermoplastic adhesive resin layer. The thickness of the adhesive layer is arbitrarily selected within the range of about 0.02 mm to 0.05 mm.

[0036] The bonded portion 11c composed of the cover tape 11a and the reinforcing tape 11b is a combination of the above-described cover tape 11a and reinforcing tape 11b as shown in FIGS. 3, 6, and 7(C), and thus the description thereof is omitted here.

[0037] <Fixed portion> As shown in FIGS. 1 to 7, the coaxial flat cable 20 is composed of terminal portions 21 located on both sides in the longitudinal direction Y and an intermediate portion 22 other than the terminal portions 21. The terminal portion 21 is composed of a fixed portion 21a and a terminal processing portion 21b. The fixed portion 21a is provided at both ends in the width direction X of the resin tape 11 located at the terminal portion 21, and is fixed to the substrate 30 or the connector as shown in FIGS. 10 to 13. The fixing is performed by locking, fitting, crimping, caulking, etc. between the fixed portion 21a and the fitting portion 33.

[0038] The terminal processing part 21b is shown in the examples of FIGS. 1 to 6 as not yet processed, but it is processed into the form as shown in FIG. 9. The terminal processing part 21b is processed such that the center conductor 1, the insulator 2, and the outer conductor 3 are each exposed. As shown in FIGS. 10 to 13, the center conductor 1 is soldered to the electrode 31 of the substrate 30 to form a solder connection part 41, and the outer conductor 3 is soldered to the electrode 32 of the substrate 30 to form a solder connection part 42. In the present invention, the fixing of the coaxial flat cable 20 is not performed by the solder connection parts 41 and 42 as in the prior art, but is performed between the fixing part 21a and the fitting part 33. As a result, the stress that was conventionally applied to the solder connection parts 41 and 42 can be received by the entire resin tape, and it is possible to prevent stress from being applied to the solder connection parts 41 and 42 of the specific coaxial cable 10. As a result, stress concentration on the solder connection parts 41 and 42 of the specific center conductor 1 and outer conductor 3 is eliminated, and it is possible to prevent breakage at the solder connection parts 41 and 42.

[0039] The form of the fixing part 21a is not particularly limited as long as it can be locked, fitted, crimped, caulked, etc. with the fitting part 33 of a substrate or the like. For example, it is preferably a notch 13 as shown in FIGS. 1 to 3, FIG. 9, and FIG. 10. This notch 13 may be a semi-circular notch as shown in FIGS. 1 to 3, or may be a rectangular notch as shown in FIGS. 9 and 10.

[0040] Also, the fixing part 21a is preferably a protrusion 12 as shown in FIGS. 4 to 6, FIG. 12, and FIG. 13. This protrusion 12 may be a protrusion that protrudes in the width direction X from the end side in the longitudinal direction Y of the cover tape 11a as shown in FIG. 4, or may be a protrusion that protrudes at both ends in the width direction X of the reinforcing tape 11b as shown in FIGS. 5, 6, and 12.

[0041] Also, the fixing part 21a is preferably a hole 14 as shown in FIG. 11. In the example of FIG. 11, this hole 14 is provided in the reinforcing tape 11b, but it may be provided in the cover tape 11a in the same manner as the notch 13 (not shown).

[0042] Further, although not shown, the fixing portion 21a may be crimped or caulked.

[0043] (Coaxial flat cable) The coaxial flat cable 20 thus obtained is used inside or between electronic devices such as liquid crystal TVs and servers, and stress can be prevented from being applied to the specific coaxial cable 10 even by handling the coaxial flat cable 20 or the like. As a result, stress concentration on the solder joints of the specific outer conductor and center conductor is eliminated, and breakage at the solder joints can be prevented.

[0044] In the coaxial flat cable 20, the plurality of coaxial cables 10 arranged side by side in the width direction X may be arranged at a constant pitch, or may be arranged so that adjacent coaxial cables 10 are in contact. Also, as shown in FIGS. 2 and 9 to 13 and the like, those in contact in pairs of two may be arranged side by side with a certain interval therebetween.

[0045] Furthermore, in this coaxial flat cable 20, it is possible to increase the outer diameter of the center conductor 1 without increasing the outer diameter of the coaxial cable 10. As a result, the effective cross-sectional area of the center conductor 1 can be increased to suppress an increase in high-frequency resistance (alternating current resistance). Furthermore, it is not easily crushed during manufacturing (for example, during pressurization such as heat sealing) or wiring work, and the distance between the center conductor 1 and the outer conductor 3 does not change, so the characteristic impedance is stable and the high-frequency characteristics can be made stable.

Example

[0046] Hereinafter, the present invention will be described more specifically with reference to examples. Note that the present invention is not limited to the following examples.

[0047] [Fabrication of Coaxial Cable] For the coaxial cable 10, as the center conductor 1, an AWG32 (outer diameter of about 0.24 mm) formed by stranding 7 silver-plated soft copper wires with a diameter of 0.08 mm was used. The insulator 2 was formed by extruding PFA resin (manufactured by DuPont) at 350 °C using a die nipple for a hollow structure body, and as shown in Fig. 8(B), a hollow structure body with a cross-sectional form in which the void portion 2A was surrounded by an inner annular portion 2B, an outer annular portion 2C, and a connecting portion 2D was formed. In this hollow structure body, the thickness of the inner annular portion 2B was 0.05 mm, the thickness of the outer annular portion 2C was 0.05 mm, the thickness of the connecting portion 2D was 0.05 mm, the outer diameter of the hollow structure body (insulator 2) was 0.60 mm, and the porosity of the void portion 2A was 30% with respect to the area of the entire insulator (entire hollow structure body). The dielectric constant ε was about 1.6.

[0048] For the outer conductor 3, 38 tin-plated soft copper wires with a diameter of 0.05 mm were used, and they were wound around the outer periphery of the insulator 2 at a pitch of 12 mm using a horizontal winding shield machine to form a horizontally wound fine wire horizontal winding 3A. Further, a polyethylene terephthalate film with a thickness of 0.004 mm (insulating tape 3B with a metal layer) on which a copper layer with a thickness of 0.008 mm was formed was cut to a width of 2.5 mm, and using a tape winding machine, the copper layer was wound around the horizontally wound fine wire horizontal winding 3A side with a 1 / 3.5 lap. Next, a polyester tape (insulating tape 4A) with a thickness of 0.004 mm on which a polyester thermoplastic resin with a thickness of 0.001 mm (adhesive layer 4B) was provided on one side was cut to a width of 3.0 mm, and using a tape winding machine, the adhesive layer 4B was wound around the outer conductor side with a 1 / 3 lap.

[0049] [Coaxial Flat Cable] (Example 1) Prepare 16 of the obtained coaxial cables 10, and as shown in FIGS. 2 and 9, arrange them in pairs of two in contact with each other at regular intervals. After that, as shown in FIG. 1, paste and integrate them from both sides with a cover tape 11a to form a coaxial flat cable 20 as shown in FIG. 7(A). The cover tape 11a was pasted using a polyethylene terephthalate film substrate with a thickness of 0.025 mm provided with a polyester thermoplastic resin (adhesive layer) with a thickness of 0.035 mm on one side, cut to a width of 25 mm. Cut the coaxial flat cable 20B to a predetermined length. The notch 13 was provided in a semi-circular shape with a radius of 1.5 mm at both ends in the width direction X at a position 5 mm from the end face in the longitudinal direction Y of the cover tape 11a (see FIG. 1). The coaxial flat cable 20A thus produced was attached to the substrate. The attachment was performed by fitting the notch 13 into the fitting portion, soldering the center conductor 1 to the solder connection portion 41, and soldering the outer conductor 3 to the solder connection portion 42.

[0050] (Example 2) Prepare 16 of the obtained coaxial cables 10, and as shown in FIGS. 2 and 9, arrange them in pairs of two in contact with each other at regular intervals. After that, as shown in FIG. 2, paste and integrate them on one side with a reinforcing tape 11b to form a coaxial flat cable 20 as shown in FIG. 7(B). The reinforcing tape 11b was pasted using a polyethylene terephthalate film substrate with a thickness of 0.125 mm provided with a polyester thermoplastic resin (adhesive layer) with a thickness of 0.042 mm on one side, cut to a width of 25 mm in the width direction X and a length of 10 mm in the longitudinal direction Y. Cut the coaxial flat cable 20 to a predetermined length. The notch 13 was provided in a semi-circular shape with a radius of 1.5 mm at both ends in the width direction X at a position 5 mm from the end face of the reinforcing tape 11b (see FIG. 2). The coaxial flat cable 20B thus produced was attached to the substrate 30 as shown in FIGS. 10(A) and 10(B). The attachment was performed as shown in FIG. 10 by fitting the notch 13 into the fitting portion 33, soldering the center conductor 1 to the solder connection portion 41, and soldering the outer conductor 3 to the solder connection portion 42.

[0051] (Example 3) Prepare 16 of the obtained coaxial cables 10, and as shown in FIGS. 2 and 9, arrange them in pairs of two in contact with each other at regular intervals. Then, as shown in FIG. 3, bond them together from both sides with a cover tape 11a to integrate them. Further, bond a reinforcing tape 11b to the terminal portion 21 on one side of the cover tape 11a to obtain the coaxial flat cable 20 shown in FIG. 7(C). The cover tape 11a and the reinforcing tape 11b used were bonded together using the same ones as in Example 1 and Example 2, respectively. Cut the coaxial flat cable 20 to a predetermined length, and provide the protrusions 12 at both ends in the width direction X at a position 5 mm from the end face of the bonding portion 11c with a protruding length of 1.5 mm (see FIG. 6).

[0052] (Example 4) Prepare 16 of the obtained coaxial cables 10, and as shown in FIGS. 2 and 9, arrange them in pairs of two in contact with each other at regular intervals. Then, as shown in FIG. 2, bond a reinforcing tape 11b to one side to integrate them, obtaining the coaxial flat cable 20 shown in FIG. 7(B). The reinforcing tape 11b was bonded using a polyethylene terephthalate film substrate with a thickness of 0.125 mm having a polyester thermoplastic resin (adhesive layer) provided on one side, cut to a width of 25 mm in the width direction X and a length of 10 mm in the longitudinal direction Y. Cut the coaxial flat cable 20 to a predetermined length, and as the protrusions 12, notch both ends from 7 mm to 10 mm from the end face of the reinforcing tape 11b to provide protrusions 12 with a length of 7 mm (see FIG. 13). The coaxial flat cable 20 thus produced was attached to the substrate 30 as shown in FIGS. 13(A) and (B). The attachment was performed as shown in FIG. 13, fitting the protrusions 12 into the fitting portions 33, soldering the center conductor 1 to the soldering connection portion 41, and soldering the outer conductor 3 to the soldering connection portion 42.

Explanation of Reference Numerals

[0053] 1 Center conductor 2 Insulator 2A Void portion 2B Inner annular portion 2C Outer annular portion 2D Connecting portion 2E Void portion 3 Outer Conductor 3A Fine Wire Wound Horizontally 3B Insulating Tape with Metal Layer 4 Outer Cover 4A Insulating Tape 4B Adhesive Layer 10 Coaxial Cable 11 Resin Tape 11a Cover Tape 11b Reinforcing Tape 11c Bonding Part 12 Protrusion 13 Notch 14 Hole 20, 20A - 20F Coaxial Flat Cable 21 Terminal Part 21a Fixing Part 21b Terminal Processing Part 22 Intermediate Part (Part other than Terminal Part) 30 Substrate 31 Electrode 32 Electrode 33 Fitting Part 41 Solder Connection Part of Central Conductor 42 Solder Connection Part of Outer Conductor X Width Direction Y Longitudinal Direction

Claims

1. A coaxial flat cable having a plurality of coaxial cables arranged side by side in the width direction and a resin tape bonded to one or both sides of at least the terminal portions of the plurality of coaxial cables to integrate the terminal portions, wherein each of the plurality of coaxial cables is soldered to a substrate or a connector, Among the resin tapes, the resin tape located at the terminal portion has fixing portions fixed to the substrate or the connector provided at both ends in the width direction, When the resin tape is a reinforcing tape provided at the terminal portions of the plurality of coaxial cables, the fixing portion is provided on the reinforcing tape. A coaxial flat cable characterized by this.

2. The coaxial flat cable according to claim 1, wherein the fixing portion is a hole or a protrusion that is fitted into a fitting portion provided in the substrate or the connector.

3. The coaxial flat cable according to claim 1, wherein the fixing portion is a notch that is fitted into a fitting portion provided in the substrate or the connector.

4. A coaxial flat cable having a plurality of coaxial cables arranged side by side in the width direction and a resin tape bonded to one or both sides of at least the terminal portions of the plurality of coaxial cables to integrate the terminal portions, wherein each of the plurality of coaxial cables is soldered to a substrate or a connector, Among the resin tapes, the resin tape located at the terminal portion has fixing portions fixed to the substrate or the connector provided at both ends in the width direction, When the resin tape is a cover tape that sandwiches the entire plurality of coaxial cables from both sides and a reinforcing tape bonded to one side of the cover tape at the terminal portions of the plurality of coaxial cables, the fixing portion is provided at the bonding portion of the cover tape and the reinforcing tape. A coaxial flat cable characterized by this.

5. The coaxial flat cable according to claim 4, wherein the fixing portion is a hole or a protrusion that is fitted into a fitting portion provided in the substrate or the connector.

6. The coaxial flat cable according to claim 4, wherein the fixing portion is a notch that is fitted into a fitting portion provided in the substrate or the connector.

7. The coaxial cable includes at least a center conductor, an insulator provided on the outer periphery of the center conductor, an outer conductor provided on the outer periphery of the insulator, and an outer covering provided on the outer periphery of the outer conductor. The coaxial flat cable according to any one of claims 1 to 6, wherein the portions soldered to the substrate or the connector are the center conductor and the outer conductor.

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