WO2018159489A1 - シールドフラットケーブル - Google Patents
シールドフラットケーブル Download PDFInfo
- Publication number
- WO2018159489A1 WO2018159489A1 PCT/JP2018/006699 JP2018006699W WO2018159489A1 WO 2018159489 A1 WO2018159489 A1 WO 2018159489A1 JP 2018006699 W JP2018006699 W JP 2018006699W WO 2018159489 A1 WO2018159489 A1 WO 2018159489A1
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- WIPO (PCT)
- Prior art keywords
- resin
- flat
- shield layer
- resin film
- shield
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/08—Flat or ribbon cables
- H01B7/0838—Parallel wires, sandwiched between two insulating layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/08—Flat or ribbon cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/08—Flat or ribbon cables
- H01B7/0861—Flat or ribbon cables comprising one or more screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
Definitions
- the present invention relates to a shielded flat cable.
- Patent Document 1 discloses a flat cable having a connection terminal in which a plurality of parallel conductors are arranged, insulating resin films are bonded from above and below, and at least one cable end is connected to an electrical connector. .
- a shielding metal foil film is arranged so that the metal surface is on the outside, and the metal foil film is covered with a protective resin film except for a ground connection portion for ground connection. .
- the shielded flat cable of the present invention is A plurality of parallel rectangular conductors, A pair of resin insulation layers sandwiching the plurality of flat conductors from both sides of the parallel surface of the plurality of flat conductors and covering portions other than the lengthwise ends of the plurality of flat conductors; A shield layer in contact with the outer surface of at least one of the pair of resin insulation layers; A pair of first resin films with an adhesive covering the outer surfaces of the pair of resin insulation layers or the shield layer; With The dielectric tangent at 10 GHz of the resin insulation layer in contact with the shield layer of the pair of resin insulation layers is 0.001 or less, The adhesive or the pair of first resin films is made of a flame retardant material.
- FIG. 2 is a cross-sectional view (vertical cross-sectional view) taken along the line AA of the flat cable of FIG. 1.
- FIG. 1 It is a schematic diagram which shows the manufacturing method of the flat cable of FIG.
- FIG. 1 It is a schematic diagram which shows the manufacturing method of the flat cable of FIG.
- FIG. 1 It is a schematic diagram which shows the manufacturing method of the flat cable of FIG.
- FIG. 10 It is a cross-sectional view of the flat cable shown in FIG. 10 is a cross-sectional view of a flat cable according to Modification 2.
- FIG. 10 is a cross-sectional view of a flat cable according to Modification 3.
- FIG. It is a cross-sectional view of the flat cable which concerns on the modification 4.
- 10 is a cross-sectional view of a flat cable according to another example of Modification 4.
- FIG. 10 is a longitudinal sectional view of a flat cable according to Modification 5.
- FIG. 10 is a longitudinal sectional view of a flat cable according to Modification 5.
- FIG. 10 is a longitudinal sectional view of a flat cable according to Modification 6.
- FIG. It is a cross-sectional view showing a flat cable used in signal attenuation evaluation of the present invention. It is a cross-sectional view which shows the flat cable which concerns on the conventional structure used in the signal attenuation
- FIG. 15 It is a graph which shows the frequency characteristic of signal attenuation amount about the flat cable shown in FIG. 15, and the flat cable shown in FIG. It is a table
- FIG. 12 is a cross-sectional view of a flat cable according to another example of Modification 7.
- FIG. 10 is a longitudinal sectional view showing an end portion in a length direction of a flat cable according to Modification Example 10.
- FIG. 12 is a perspective view showing an end portion in the length direction of a flat cable according to another example of Modification Example 10.
- FIG. 10 is a cross-sectional view of a flat cable according to still another example of Modification 4.
- An object of this invention is to provide the shield flat cable which can improve a transmission characteristic.
- the shield flat cable which can improve a transmission characteristic can be provided.
- the shielded flat cable according to the embodiment of the present invention is (1) a plurality of parallel rectangular conductors; A pair of resin insulation layers sandwiching the plurality of flat conductors from both sides of the parallel surface of the plurality of flat conductors and covering portions other than the lengthwise ends of the plurality of flat conductors; A shield layer in contact with the outer surface of at least one of the pair of resin insulation layers; A pair of first resin films with an adhesive covering the outer surfaces of the pair of resin insulation layers or the shield layer; With The dielectric tangent at 10 GHz of the resin insulation layer in contact with the shield layer of the pair of resin insulation layers is 0.001 or less, The adhesive or the pair of first resin films is made of a flame retardant material.
- the dielectric loss tangent is lower than that of a conventional flat cable, transmission characteristics can be improved. Further, since the adhesive or the first resin film outside the shield layer is made of a flame retardant material, the flame retardancy of the shield flat cable can be maintained.
- the shield layer has an end portion of the outermost rectangular conductor that is more than an end portion of the outermost flat conductor of the plurality of flat conductors. More than 1/2 of the width dimension, An end of the shield layer in the parallel direction may be covered with the resin insulating layer.
- the shield layer has an end portion of the outermost flat conductor that is more than an end portion of the outermost flat conductor of the plurality of flat conductors. More than 1/2 of the width dimension, The end of the shield layer in the parallel direction may be covered with the first resin film.
- the shield layer protrudes outward from the end of the flat conductor, so that the noise resistance and high frequency characteristics of the flat cable can be maintained well, and the shield layer Since the end portion in the conductor parallel direction is not exposed, it is possible to prevent problems (such as the occurrence of sparks) during the withstand voltage test after cable formation.
- a grounding member attached to the end in the length direction is further provided, A part of the shield layer may be exposed from the first resin film, and the grounding member may be in contact with the shield layer at the exposed portion.
- the shield flat cable can be reliably grounded by providing the grounding member.
- the shield layer may be exposed at the end in the length direction.
- the grounding can be performed by the shield layer without using the grounding member, and the production cost can be reduced and the thickness can be reduced.
- each of the plurality of flat conductors may be completely exposed from the resin insulating layer.
- a grounding member that is overlapped in contact with the outer surface of the shield layer at the end in the length direction further includes: The shield layer and the ground member may be covered with the first resin film.
- a part of the grounding member may protrude from the first resin film, and the protruding portion may be in parallel with the plurality of flat conductors.
- the ground terminal can be connected to the substrate or the like simultaneously with the signal terminal by equalizing the lengthwise position where the flat conductor and the ground member are attached to the substrate or the like.
- the circuit arrangement can be simplified.
- the impedance can be adjusted by adjusting the thickness of the grounding member or the like.
- a second resin film covering the first resin film is further provided,
- the second resin film may be bonded to at least a part of the exposed portions of the plurality of flat conductors.
- the shield layer may be bonded to the outer surface of the third resin film.
- the third resin film may be bonded to the resin insulating layer at the end in the length direction.
- the exposed portion of the flat conductor can be reinforced with the second resin film or the third resin film.
- a third resin film bonded to the exposed portion of the plurality of flat conductors and the shield layer; A grounding member that is in contact with the outer surface of the shield layer and is laminated to the third resin film; and May be further provided.
- the grounding member can be reinforced by the third resin film together with the exposed portion of the flat conductor.
- At least a part of the end portion of the resin insulating layer in the parallel direction of the flat conductors may be covered with the first resin film.
- the entire surface of the end portion of the resin insulating layer may be covered with the first resin film.
- the flame retardancy is further improved, and problems during a withstand voltage test after cable formation can be prevented.
- FIG. 1 is a cross-sectional view (transverse cross-sectional view) in a direction perpendicular to the length direction of a shielded flat cable (hereinafter referred to as a flat cable) 1 according to the first embodiment.
- the flat cable 1 according to the present embodiment is a cable used for electrically connecting devices or for wiring in a device.
- the flat cable 1 includes a plurality of (here, four) flat conductors 10, a pair of resin insulation layers 20, a pair of shield layers 30, and a pair of resin films 40 (first An example of a resin film).
- the plurality of flat conductors 10 are arranged in a planar shape.
- Each flat conductor 10 is made of, for example, a tin-plated copper conductor.
- the flat conductor 10 is formed in a substantially flat rectangular shape in cross section.
- the flat cable 1 is constituted by the four flat conductors 10, but the number of the flat conductors 10 is arbitrary.
- the pair of resin insulation layers 20 is a layer for ensuring the pressure resistance and high frequency characteristics of the flat cable 1 and is formed of a resin such as polyethylene, polypropylene, polyimide, polyethylene terephthalate, polyester, or polyphenylene sulfide. .
- the resin insulation layer 20 electrically insulates the plurality of flat conductors 10 and is interposed between the flat conductors 10 and the shield layer 30 for use in a high frequency region, and is electrostatically coupled. Functions as a capacitor.
- the resin insulating layer 20 is also called a dielectric, and the dielectric loss tangent (tan ⁇ ) of the resin material constituting the resin insulating layer 20 is a parameter that affects the transmission characteristics of the flat cable 1.
- the dielectric loss tangent is desirably smaller from the viewpoint of reducing dielectric loss (insertion loss).
- the resin material constituting the resin insulating layer 20 does not contain a flame retardant.
- a resin material (for example, polypropylene) that does not contain a flame retardant has a dielectric loss tangent of about 0.0002 at 10 GHz, and a dielectric tangent of a resin material that contains a flame retardant (for example, a dielectric loss tangent of about 0.0023 at 10 GHz). Is smaller). Therefore, it is preferable that the resin insulating layer 20 be formed of a resin material that does not contain a flame retardant, since the dielectric loss tangent is reduced, and in particular, the dielectric loss of a high-frequency signal is reduced.
- the dielectric loss tangent of polyimide at 10 GHz is about 0.001
- the dielectric loss tangent of the resin insulating layer 20 in this embodiment is preferably 0.001 or less.
- the pair of resin insulation layers 20 are bonded to each other in a state where a plurality of flat conductors 10 arranged in a plane are sandwiched from both sides of the parallel surface. Thereby, the plurality of flat conductors 10 are covered with the pair of resin insulating layers 20.
- the pair of shield layers 30 are layers having a shielding function for noise countermeasures and ensuring high frequency characteristics of the flat cable 1, and are formed of, for example, a metal foil of copper foil or aluminum foil. Between each resin insulation layer 20 and each shield layer 30, an adhesive layer 35 (hereinafter referred to as an anchor coat layer 35) for bonding the resin insulation layer 20 and the shield layer 30 is provided.
- an adhesive layer 35 (hereinafter referred to as an anchor coat layer 35) for bonding the resin insulation layer 20 and the shield layer 30 is provided.
- the anchor coat layer 35 any material can be used.
- a urethane anchor coat material in which an isocyanate curing agent is mixed with polyurethane as a main agent can be used.
- the pair of shield layers 30 are respectively arranged so that the anchor coat layer 35 is in contact with the outer surfaces of the pair of resin insulation layers 20 (surfaces opposite to the adhesive surfaces with the flat conductors 10).
- Each of the pair of shield layers 30 is such that both end portions in the parallel direction of the plurality of flat conductors 10 (hereinafter referred to as conductor parallel directions) substantially coincide with both end portions of the resin insulating layer 20 in the conductor parallel direction.
- the resin insulating layer 20 is bonded. That is, each of the pair of shield layers 30 is such that both ends in the conductor parallel direction protrude outside the outer end of the outermost flat conductor 10A among the plurality of flat conductors 10 in the conductor parallel direction. Has been placed.
- the rectangular conductor 10 is arranged such that the distance L1 between the outer end of the flat conductor 10A and the end of the shield layer 30 in the conductor parallel direction is 1/2 or more of the width L2 of the flat conductor 10A.
- the parallel pitch and the width dimension of the shield layer 30 are set. Thereby, the noise tolerance of the flat cable 1 and a high frequency characteristic can be maintained favorable.
- the pair of resin films 40 includes a base material layer 42, a flame retardant insulating layer 44, and an adhesive layer 46 (hereinafter referred to as an anchor coat layer 46).
- the base material layer 42 is a layer for ensuring the pressure resistance of the flat cable 1 and is made of, for example, polyethylene terephthalate.
- the flame retardant insulating layer 44 is a layer for bonding the resin insulating layer 20 or the shield layer 30 and the base material layer 42 while ensuring the flame resistance, pressure resistance, deterioration resistance, etc. of the flat cable 1.
- it is made of a thermoplastic resin material.
- As the flame retardant insulating layer 44 for example, a thermoplastic polyester resin containing a phosphorus flame retardant or a nitrogen flame retardant can be used.
- an anchor coat layer 46 for adhering the base material layer 42 and the flame retardant insulating layer 44 is provided.
- any material can be used as the anchor coat layer 46, for example, it is preferable to use the same material as the anchor coat layer 35 of the shield layer 30.
- the pair of resin films 40 cover the outer surfaces of the shield layer 30 and the resin insulating layer 20 where the shield layer 30 is not attached.
- Each resin film 40 has a width dimension along the conductor parallel direction larger than the width dimension of the resin insulating layer 20 and the shield layer 30. That is, both end portions (hereinafter also referred to as both side end portions) of the resin film 40 in the conductor parallel direction extend outward from both side end portions of the resin insulating layer 20 and the shield layer 30.
- the entire surfaces of both end portions of the resin insulating layer 20 and the shield layer 30 are covered with the extended pair of resin films 40.
- both end portions of the base material layer 42 of the pair of resin films 40 are bonded to each other via the flame retardant insulating layer 44 and the adhesive layer 46.
- FIG. 2 is a vertical cross-sectional view of the flat cable 1 along the line AA.
- the resin insulating layer 20 and the shield layer 30 are predetermined on one surface (the upper surface in FIG. 2).
- the length is removed and the flat conductor 10 is exposed.
- the pair of resin films 40 are bonded to the outer surfaces of the pair of shield layers 30 so as to cover a part of the exposed portion of the flat conductor 10 at both ends in the cable length direction. That is, in the flat cable 1, at both ends in the length direction, the flat conductor 10 is exposed on one surface side, and the shield layer 30 is exposed on the other surface.
- the end portion in the cable length direction of the flat cable 1 configured in this way is directly inserted and connected to a connection member (not shown).
- the resin insulating layer 20 and the shield layer 30 are preferably bonded in advance via an anchor coat layer 35.
- a plurality of flat conductors 10 are supplied in parallel at a predetermined interval between a pair of laminating rollers R1 and R1 that are pressed against each other. Each flat conductor 10 is fed out from a bobbin (not shown).
- the resin insulating layer 20 with the shield layer 30 bonded between the pair of laminating rollers R 1 and R 1 is supplied to both sides of the parallel surface of the flat conductor 10.
- the resin insulating layer 20 with the shield layer 30 bonded between the pair of laminating rollers R 1 and R 1 is supplied to both sides of the parallel surface of the flat conductor 10.
- the resin insulating layer 20 with the shield layer 30 is supplied to the pair of laminating rollers R1 and R1 at a predetermined interval in the cable length direction, while on the lower surface side of FIG.
- the resin insulating layer 20 with the layer 30 is continuously supplied to the pair of laminating rollers R1 and R1. Then, the pair of laminating rollers R1 and R1 press the pair of resin insulation layers 20 with the shield layer 30 sandwiching the flat conductor 10 at a predetermined interval, and the resin insulation layers 20 are bonded to each other.
- the resin film 40 is supplied to both outer sides of the upper and lower shield layers 30 at a predetermined interval in the cable length direction between a pair of laminating rollers R2 and R2 that are pressed against each other. Then, the pair of laminating rollers R2 and R2 press the pair of resin films 40 sandwiching the shield layer 30, and the resin films 40 are bonded to each other to form the long cable 101. Finally, as shown in FIG. 5, the long cable 101 produced in this way is cut at the portion where the flat conductor 10 is exposed from the resin film 40, whereby the flat cable 1 is obtained (FIG. 1 and FIG. 1). 2). As described above, the length of the resin insulating layer 20 with the shield layer 30 supplied to the laminating rollers R1 and R1 on the upper surface side of FIG. The flat cable 1 can be easily created.
- the flat cable 1 includes a plurality of flat conductors 10 arranged in parallel and the flat conductors 10 sandwiched from both parallel surfaces of the flat conductors 10.
- the dielectric tangent at 10 GHz of the pair of resin insulation layers 20 is 0.001 or less, and the flame retardant insulation layer 44 constituting the resin film 40 is made of a flame retardant material (a flame retardant is included).
- the dielectric loss tangent of the resin insulating layer 20 is lower than that of the conventional flat cable, the transmission characteristics of the flat cable 1 can be improved. Moreover, since the resin film 40 consists of a flame retardant material, the flame retardance of the flat cable 1 can be maintained.
- the end of the shield layer in the conductor parallel direction is exposed, the exposed portion of the metal constituting the shield layer is sparked during the withstand voltage test after flat cable manufacture, and the withstand voltage test cannot be performed.
- the end portion (side end portion) of the shield layer 30 in the conductor parallel direction is covered with the resin film 40, and the metal portion is at the side end portion of the flat cable 1. Since it is not exposed, it is possible to prevent problems such as the occurrence of sparks during a withstand voltage test after cable formation.
- the shield layer 30 is exposed on one side of both ends in the length direction. Thereby, it is also possible to perform grounding directly by the shield layer 30 without using a grounding member described later. Therefore, it is possible to reduce the production cost and reduce the thickness of the flat cable 1.
- FIG. 6 is an exploded view of the flat cable 1A according to the first modification in the cross-sectional direction
- FIG. 7 is a cross-sectional view of the flat cable 1A.
- the resin insulating layer 20 and the shield layer 30 are bonded in advance via the anchor coat layer 35, and the pair of the resin insulating layers 20 with the shield layer 30 are arranged in parallel.
- the plurality of flat rectangular conductors 10 are bonded so as to be sandwiched, but the present invention is not limited to this example.
- the resin insulation layer 20 and the shield layer 30 ⁇ / b> A are not pasted together, and after a pair of resin insulation layers 20 are sandwiched and stuck together,
- the shield layer 30 ⁇ / b> A may be attached to the outer surface of the resin insulating layer 20 via the anchor coat layer 35.
- the width dimension of the resin insulating layer 20 and the width dimension of the shield layer 30 are substantially the same, but the present invention is not limited to this example. If the distance between the end of the rectangular conductor 10A at the outermost end and the end of the shield layer 30A in the conductor parallel direction is 1/2 or more of the width dimension of the flat conductor 10A, as shown in FIG.
- the width dimension of the layer 30 ⁇ / b> A may be smaller than the width dimension of the resin insulating layer 20.
- a pair of resin films 40 are bonded so as to cover both end portions of the shield layer 30A and both end portions of the resin insulating layer 20 step by step.
- FIG. 8 is a cross-sectional view of a flat cable 1B according to the second modification.
- the width dimension of the shield layer 30 ⁇ / b> B is larger than the width dimension of the resin insulating layer 20.
- both end portions (extending portions) of the pair of shield layers 30B cover both end surfaces of the resin insulating layer 20 in the conductor parallel direction and are bonded to each other. That is, the entire periphery of the pair of resin insulating layers 20 in the cross-sectional view is covered with the shield layer 30B.
- flat cable 1B is formed by bonding a pair of resin film 40 so that the outer surface of a pair of shield layer 30B may be covered.
- these shield layers 30B are electrically connected to each other by bonding the pair of shield layers 30B together. Therefore, during operation of an electronic device using the flat cable 1B, signal noise generated from the electronic circuit of the electronic device can be collectively released from both shield layers 30B.
- FIG. 9 is a cross-sectional view of a flat cable 1C according to Modification 3.
- the shield layer 30 ⁇ / b> C of the flat cable 1 ⁇ / b> C is wound around the resin insulation layer 20 sandwiching the flat conductor 10 so as to cover the entire circumference of the pair of resin insulation layers 20 in a cross-sectional view.
- the shield layer 30C is preferably wound around the resin insulating layer 20 so that one side end is bonded to the other side end (both ends of the shield layer 30 overlap each other).
- flat cable 1C is formed by bonding a pair of resin film 40 so that the shield layer 30C wound around the resin insulation layer 20 may be covered. Even in this configuration, noise can be released from the shield layer 30 ⁇ / b> C at once as in the second modification.
- FIG. 10 is a cross-sectional view of a flat cable 1D according to Modification 4.
- the positions of the side end portions of the pair of resin insulating layers 20 in the conductor parallel direction and the side end portions of the pair of resin films 40 substantially coincide with each other. That is, the pair of resin insulating layers 20 are exposed at both end portions. Further, both end portions of the shield layer 30 are covered with the resin insulating layer 20. According to such a flat cable 1D, transmission characteristics can be improved as in the first embodiment.
- both end portions of the resin insulating layer 20 may be covered with a flame retardant insulating layer 48 made of the same flame retardant insulating material as the flame retardant insulating layer 44 of the resin film 40.
- flat cable 1D of the modification 4 although the both ends of the shield layer 30 are covered with the resin insulating layer 20, it is not restricted to this example. For example, it is good also as a structure where at least one part of the both-ends part of the shield layer 30 is covered with the resin film 40 like the flat cable 1E shown in FIG. Also in this case, it is possible to prevent problems during the withstand voltage test after the cable is formed.
- FIG. 12 is a longitudinal sectional view of a flat cable 1F according to the fifth modification.
- the resin insulating layer 20 and the shield layer 30 are removed by a predetermined length on one surface (upper surface in FIG. 12), and the flat conductor 10 is Exposed (exposed portion is indicated by F in FIG. 12).
- the resin insulating layer 20 is removed by a predetermined length, and the portion between the flat conductor 10 and the shield layer 30 where the resin insulating layer 20 is removed is removed.
- a resin film 50 an example of a third resin film
- the resin film 50 is bonded to at least a part of the exposed portion F of the plurality of flat conductors 10 and one shield layer 30 is bonded.
- a pair of resin films 40 are bonded from the outer surfaces of the pair of shield layers 30.
- the resin film 50 is made of the same resin material as the resin film 40 (for example, polyethylene terephthalate).
- the resin film 40 is made of the same resin material as the resin film 40 (for example, polyethylene terephthalate).
- the pair of resin films 40 are preferably bonded to each other so as to cover a part of the portion F exposed from the resin insulating layer 20 of the flat conductor 10. Thereby, since the resin insulating layer 20 is not exposed, flame retardance can be improved.
- the resin film 50 attached to one surface of the flat conductor 10 is disposed only between the portion F exposed from the resin insulating layer 20 of the flat conductor 10 and the shield layer 30. It is not limited to examples.
- the resin film 50 ⁇ / b> A may extend between the shield layer 30 and the resin insulating layer 20 where the flat conductor 10 is not exposed. . That is, the resin film 50 ⁇ / b> A may be bonded to the resin insulating layer 20 at the end in the cable length direction. According to this structure, reinforcement of the exposed flat conductor 10 can be made more reliable.
- FIG. 14 is a longitudinal sectional view of a flat cable 1H according to Modification 6.
- the grounding member 60 is attached to both ends in the cable length direction so as to be electrically connected to the shield layer 30.
- a pair of resin insulation layers 20 and a pair of shield layers 30 are removed by a predetermined length on both surfaces (upper and lower surfaces of FIG. 14) of the flat cable 1H, and the flat conductor 10 is exposed.
- a predetermined length of the resin film 50 ⁇ / b> A is bonded to one surface (the lower surface in FIG. 14) of the exposed portion of the flat conductor 10 so as to extend to one shield layer 30 of the pair of shield layers 30.
- part H except the both ends of a cable length direction is not covered with the resin film 50A.
- the grounding member 60 is disposed so as to contact the outer surface of the resin film 50A at both ends in the cable length direction and to contact the shield layer 30 of the portion H not covered with the resin film 50A. Thereby, the shield layer 30 is electrically connected to the ground member 60. Then, the flat conductor 10, the resin film 50A, and the ground member 60 are exposed at both ends in the cable length direction, and the portions other than both ends of the pair of shield layers 30 and the ground member 60 are a pair of resin films. 40. As in the fourth modification, the pair of resin films 40 are bonded to each other so as to cover part of the exposed portion of the flat conductor 10 from the resin insulating layer 20 in order not to expose the resin insulating layer 20. It is preferable.
- the grounding member 60 is provided at the end in the cable length direction, and a part of the grounding member 60 is covered with the resin film 40 together with the shield layer 30, so that the flat cable 1H can be grounded reliably and easily.
- the grounding member 60 can be integrated into the flat cable 1H.
- FIG. 15 is a cross-sectional view showing a cable according to the configuration of the embodiment used in the present evaluation. Specifically, the one in which the pair of resin films 40 are not bonded around the shield layer 30C of the flat cable 1C of Modification 3 (hereinafter referred to as a cable 1J) was used. The dielectric loss tangent of this cable 1J at 10 GHz is 0.0002.
- FIG. 16 is a cross-sectional view showing a cable according to a conventional configuration used in this evaluation.
- the cable 1Z shown in FIG. 16 uses the same rectangular conductor 10 as in the above embodiment.
- a pair of resin insulation layers 20Z are bonded together with four parallel rectangular conductors 10 interposed therebetween.
- This pair of resin insulation layers 20Z contains a flame retardant.
- the dielectric loss tangent at 10 GHz is 0.0023.
- a pair of insulating base layers 25Z made of, for example, polyethylene terephthalate are provided on the outer surfaces of the pair of resin insulating layers 20Z.
- an intervening tape 27Z made of polyethylene or polyester is disposed on the outer surfaces of the pair of insulating base layers 25Z, and the shield layer 30Z is wound around the periphery.
- the shield layer 30Z is made of the same material as the shield layer 30 of the present embodiment.
- FIG. 17 is a graph showing the frequency characteristics of signal attenuation for the cable 1J shown in FIG. 15 and the cable 1Z shown in FIG.
- the frequency characteristic of the signal attenuation is shown with the vertical axis representing the signal attenuation (dB) and the horizontal axis representing the frequency (GHz).
- the signal attenuation is expressed by the insertion loss (SDD21) in the differential mode in a plurality of rectangular conductors.
- the signal attenuation amount of the cable 1Z according to the conventional configuration is larger than that of the cable 1J according to the present embodiment.
- the signal attenuation amount of the cable 1Z significantly decreases as the frequency band becomes higher. You can see that
- the signal attenuation at 5 GHz is -2.9 dB for cable 1Z, while -1.9 dB for cable 1J, and the signal attenuation of cable 1J relative to cable 1Z.
- the improvement rate of was 34%.
- the signal attenuation at 10 GHz is -4.9 dB for the cable 1Z, while -3.0 dB for the cable 1J, and the improvement rate of the signal attenuation of the cable 1J relative to the cable 1Z is 39%. .
- the flat conductor 10 and the shield layer 30 In the configuration of the cable 1J according to the above-described embodiment in which no insulating base material layer or intervening tape is disposed therebetween, the dielectric loss tangent of the resin insulating layer 20 is low, and it has been confirmed that the transmission characteristics can be significantly improved.
- FIG. 19 is a cross-sectional view of the flat cable 100 according to the second embodiment
- FIG. 20 is a vertical cross-sectional view showing an end portion of the flat cable 100 in the length direction.
- description is abbreviate
- the illustration of the anchor coat layers 35 and 46 is omitted for the sake of simplicity.
- the shield layer 30 includes one resin insulating layer 20 of the pair of resin insulating layers 20 and one resin film 40 of the pair of resin films 40. It is only intervening between. That is, in the flat cable 100, the shield layer 30 is disposed only on one side of the parallel surface of the flat conductor 10. Similarly to the flat cable 1 of the first embodiment, also in the flat cable 100, the end portion of the shield layer 30 protrudes to the outside by a half or more of the width dimension of the flat conductor 10 at the outermost end.
- the width dimension of the pair of resin insulation layers 20 and the width dimension of the pair of resin films 40 are substantially the same, and both side ends of the shield layer 30 in the conductor parallel direction are the resin insulation layers 20. Covered with. As a result, as in the first embodiment, both end portions of the shield layer 30 are not exposed, and problems such as the occurrence of sparks during a withstand voltage test after cable formation can be prevented.
- the width dimension of a pair of resin insulating layer 20 and the width dimension of a pair of resin film 40 are substantially corresponded,
- the width dimension of the resin film 40 is larger than the width dimension of the resin insulating layer 20, and both side ends of the pair of resin films 40 are
- the resin insulating layer 20 and the shield layer 30 may be bonded to each other so as to cover both end portions.
- a grounding member 60 is attached to the flat cable 100 at the end in the cable length direction.
- the resin insulating layer 20 and the resin film 40 are removed by a predetermined length, and the flat conductor 10 is exposed.
- the resin film 40 is removed by a predetermined length at a portion that enters the inside from the end portion by a predetermined distance. The resin film 40 is exposed.
- One end side of the grounding member 60 is in contact with the exposed portion of the shield layer 30. Further, the other end side of the ground member 60 is in contact with the resin film 40 on the end side in the cable length direction.
- the resin insulation layer 20A on the side of the pair of resin insulation layers 20 on which the shield layer 30 is not provided is The resin material may contain a flame retardant material (for example, a phosphorus flame retardant or a nitrogen flame retardant). This is because even if a flame retardant is contained in the resin insulation layer 20A on the side where the shield layer 30 is not provided, the transmission characteristics of the flat cable 100 are not greatly affected.
- a flame retardant material for example, a phosphorus flame retardant or a nitrogen flame retardant.
- the resin insulation layer 20 on the shield layer 30 side is made of a resin material that does not contain a flame retardant, as in the first embodiment, the resin insulation layer 20A contains a flame retardant (similar to the prior art). )
- the flame retardancy of the flat cable 100 can be further enhanced while preventing the transmission characteristics from deteriorating.
- the flame retardance is ensured by the flame-retardant insulating layer 44 of the resin film 40.
- FIG. 21 is a cross-sectional view of a flat cable 100A according to Modification 7.
- the resin film 40 is expressed as a single layer (reference numeral 40) of the base material layer 42, the flame retardant insulating layer 44, and the anchor coat layer 46.
- the shield layer 30 has a width dimension in the conductor parallel direction that is smaller than that of the resin insulating layer 20, and both end portions thereof are covered with the resin insulating layer 20.
- a resin film that covers the outer surface of the shield layer 30 by making the width dimension of the resin insulating layer 20 on the side where the shield layer 30 is provided substantially coincide with the width dimension of the shield layer 30 as in the flat cable 100A shown in FIG. 40 may be configured to cover both end portions of the shield layer 30 and both end portions of the resin insulating layer 20 on the side where the shield layer 30 is covered.
- the flame resistance of flat cable 100A is strengthened by covering the side edge part of shield layer 30 and the side edge part of resin insulation layer 20 on the shield layer 30 side with resin film 40 containing a flame retardant.
- resin film 40 containing a flame retardant since both end portions of the shield layer 30 are not exposed, it is possible to prevent problems (such as occurrence of sparks) at the time of a withstand voltage test after cable formation.
- both end portions of the resin insulating layer 20A on the side where the shield layer 30 is not provided are exposed, but the present invention is not limited to this example.
- the resin insulating layer 20 on the side where the shield layer 30 is provided and the resin film 40 covering the shield layer 30 up to both side ends of the resin insulating layer 20A on the other side It may be covered. Thereby, while being able to improve a flame retardance, it can prevent that the both-sides edge part (edge part of the width direction which is a conductor parallel direction) peels off.
- FIG. 23 is a longitudinal sectional view showing one end portion in the length direction of a flat cable 100C according to Modification 8.
- the resin insulating layer 20 and the resin film 40 are removed by a predetermined length on the surface on the side where the shield layer 30 is not provided (the upper surface in FIG. 23). 10 is exposed.
- the resin film 40 is removed by a predetermined length, for example, by laser irradiation at a portion that enters a predetermined distance from the end portion, The shield layer 30 is exposed.
- the resin film 40 may be bonded to the shield layer 30 with a gap by a laminating roller so that a part of the shield layer 30 is exposed.
- One end side of the grounding member 60 is in contact with the exposed portion of the shield layer 30.
- the other end side of the grounding member 60 is attached to the resin film 40 on the end side in the cable length direction via the resin film 70. That is, a resin film 70 different from the resin film 40 is interposed between the resin film 40 on the end side in the cable length direction and the ground member 60.
- the resin film 70 is made of the same resin material (for example, polyethylene terephthalate) as the resin film 40 as in the case of the resin film 50 of the modified example 5.
- the exposed portion of the flat conductor 10 and the ground member 60 are reinforced by attaching the resin film 70 between the resin film 40 and the ground member 60 so as to correspond to the exposed portion of the flat conductor 10. be able to.
- FIG. 24 is a longitudinal sectional view showing an end portion in the length direction of a flat cable 100D according to Modification 9.
- the resin insulating layer 20 and the resin film 40 have a predetermined length on the surface (the upper surface in FIG. 24) where the shield layer 30 is not provided at the end in the length direction of the flat cable 100D. It has been removed and the flat conductor 10 is exposed.
- the resin insulating layer 20 is removed by a predetermined length, and the shield layer 30 is exposed.
- the resin film 80 for reinforcement is affixed on the edge part of the resin film 40.
- the resin film 80 is obtained from the same resin material as the resin film 40 (for example, polyethylene terephthalate), but a material different from the resin film 40 may be used as long as the flat conductor 10 can be reinforced.
- the grounding is performed by the exposed shield layer 30 without using the grounding member 60 of the modification 6. That is, according to the configuration of the flat cable 100D, the grounding member 60 is not necessary, so that the production cost can be reduced and the thickness can be reduced.
- FIG. 25 is a longitudinal sectional view showing one end portion of the flat cable 100E according to the tenth modification in the length direction.
- a pair of resin insulation layers 20, a shield layer 30 provided on the outer surface of one resin insulation layer 20, and a pair of resin films 40 are provided at predetermined lengths at the end in the cable length direction. It has been removed and the flat conductor 10 is exposed. The exposed portion of the flat conductor 10 is bent upward in FIG.
- a grounding member 60 that is electrically connected to the shield layer 30 is provided between the shield layer 30 and the resin film 40 at the end in the cable length direction.
- the outer surface of the resin film 40 is covered with the resin film 90 (an example of the 2nd resin film) in the position corresponding to the overlapping part of the shield layer 30 and the grounding member 60.
- the resin film 90 also covers one surface (the lower surface in FIG. 25) of the flat conductor 10 exposed from the resin insulating layer 20 and the resin film 40. That is, the resin film 90 is attached so as to extend from one surface side of the exposed portion of the flat conductor 10 to a portion of the resin film 40 where the grounding member 60 is provided.
- the resin film 90 is made of the same resin material as the resin film 40 (for example, polyethylene terephthalate), but a material different from the resin film 40 may be used.
- the grounding member 60 protrudes from the resin film 40 in a direction perpendicular to the paper surface in FIG. 25, and can be electrically connected to the grounding terminal of a connection member such as a connector at that portion. According to this configuration, the ground member 60 can be firmly attached to the shield layer 30 by covering at least a part of the ground member 60 with the resin film 40. Further, the rectangular conductor 10 protruding from the resin film 40 can be reinforced by the resin film 90.
- the end of the grounding member 60 protrudes from the resin film 40 as in the flat cable 100F shown in FIG. 26, and the protruding portion is perpendicular to the conductor parallel direction (hereinafter referred to as the cable thickness direction).
- the cable thickness direction may be bent so as to have the same height as the plurality of flat conductors 10 and arranged in parallel with the flat conductors 10.
- the pair of resin insulating layers 20 is used as an insulator for integrating a plurality of flat conductors 10, but the present invention is not limited to this example.
- the insulator may be formed by extruding and coating a resin around a plurality of parallel rectangular conductors 10 arranged in parallel. This configuration is suitable for manufacturing a large amount of the same type of flat cable (long cable).
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Abstract
Description
並列された複数本の平角導体と、
前記複数本の平角導体の並列面の両面から前記複数本の平角導体を挟み込み、前記複数本の平角導体の長さ方向の端部以外の部分を覆っている一対の樹脂絶縁層と、
前記一対の樹脂絶縁層のうち少なくとも一方の樹脂絶縁層の外面に接触しているシールド層と、
前記一対の樹脂絶縁層または前記シールド層の外面を覆っている接着剤付きの一対の第一樹脂フィルムと、
を備え、
前記一対の樹脂絶縁層のうち前記シールド層が接触している樹脂絶縁層の10GHzにおける誘電正接が0.001以下であり、
前記接着剤または前記一対の第一樹脂フィルムが難燃材料からなる。
本発明は、伝送特性を向上可能なシールドフラットケーブルを提供することを目的とする。
本発明によれば、伝送特性を向上可能なシールドフラットケーブルを提供することができる。
最初に本願発明の実施形態の内容を列記して説明する。
本願発明の実施形態に係るシールドフラットケーブルは、
(1)並列された複数本の平角導体と、
前記複数本の平角導体の並列面の両面から前記複数本の平角導体を挟み込み、前記複数本の平角導体の長さ方向の端部以外の部分を覆っている一対の樹脂絶縁層と、
前記一対の樹脂絶縁層のうち少なくとも一方の樹脂絶縁層の外面に接触しているシールド層と、
前記一対の樹脂絶縁層または前記シールド層の外面を覆っている接着剤付きの一対の第一樹脂フィルムと、
を備え、
前記一対の樹脂絶縁層のうち前記シールド層が接触している樹脂絶縁層の10GHzにおける誘電正接が0.001以下であり、
前記接着剤または前記一対の第一樹脂フィルムが難燃材料からなる。
前記シールド層の前記並列方向の端部が、前記樹脂絶縁層で覆われていても良い。
前記シールド層の前記並列方向の端部が、前記第一樹脂フィルムで覆われていても良い。
前記シールド層の一部が前記第一樹脂フィルムから露出され、当該露出部分において前記シールド層に前記接地部材が接触していても良い。
前記第一樹脂フィルムにより、前記シールド層および前記接地部材が覆われていても良い。
前記第二樹脂フィルムは、前記複数本の平角導体の露出部分の少なくとも一部に貼り合されていても良い。
前記第三樹脂フィルムの外面に前記シールド層が貼り合されていても良い。
前記シールド層の外面に接触して重ねられ、且つ、前記第三樹脂フィルムに貼り合わされている接地部材と、
をさらに備えていても良い。
以下、本発明に係るシールドフラットケーブルの実施の形態の例を、図面を参照して説明する。
図1は第一実施形態に係るシールドフラットケーブル(以下、フラットケーブルと称する)1の長さ方向に垂直な方向の断面図(横断面図)である。本実施形態に係るフラットケーブル1は、機器を電気的に接続するため、もしくは機器内配線のために用いられるケーブルである。
図2に示すように、フラットケーブル1の長さ方向(以下、ケーブル長さ方向と称する。)における両端部において、その一面(図2の上面)では、樹脂絶縁層20およびシールド層30が所定長さ除去されており、平角導体10が露出されている。一対の樹脂フィルム40は、ケーブル長さ方向の両端部における平角導体10の露出部分の一部を覆うようにして、一対のシールド層30の外面に貼り合されている。すなわち、フラットケーブル1においては、長さ方向の両端部において、その一面側では平角導体10が露出されているとともに、他面ではシールド層30が露出されている。このように構成されたフラットケーブル1のケーブル長さ方向の端部は、不図示の接続部材に直接挿入して接続される。
上記の第一実施形態のフラットケーブル1の製造方法では、樹脂絶縁層20とシールド層30とがアンカーコート層35を介して予め貼り合わされており、シールド層30付き樹脂絶縁層20の対を並列された複数本の平角導体10を挟み込むようにして貼り合せているが、この例に限られない。図6に示すフラットケーブル1Aのように、樹脂絶縁層20とシールド層30Aとが予め貼り合されておらず、一対の樹脂絶縁層20が並列された平角導体10を挟み込んで貼り合わされた後に、その樹脂絶縁層20の外面にアンカーコート層35を介してシールド層30Aを貼り付ける構成としても良い。
図8に示すように、変形例2では、シールド層30Bの幅寸法は、樹脂絶縁層20の幅寸法よりも大きくなっている。そして、一対のシールド層30Bの両端部(延出部分)が樹脂絶縁層20の導体並列方向の両端面を覆うとともに、互いに貼り合わされている。すなわち、一対の樹脂絶縁層20の横断面視における全周囲がシールド層30Bにより覆われている。そして、一対のシールド層30Bの外面を覆うように一対の樹脂フィルム40を貼り合せることで、フラットケーブル1Bが形成される。このように、一対のシールド層30B同士を貼り合わせることで、これらのシールド層30Bが互いに電気的に接続される。そのため、フラットケーブル1Bが用いられる電子機器の作動中に、当該電子機器の電子回路から発生する信号のノイズを両シールド層30Bから一括して逃がすことができる。
図9に示すように、フラットケーブル1Cのシールド層30Cは、一対の樹脂絶縁層20の横断面視における全周囲を覆うべく、平角導体10を挟み込んだ樹脂絶縁層20の周囲に巻き付けられている。このとき、シールド層30Cは、一方の側端部が他方の側端部に貼り合わされる(シールド層30の両端部同士が重なり合う)ようにして樹脂絶縁層20の周囲に巻き付けられることが好ましい。そして、樹脂絶縁層20に巻き付けられたシールド層30Cを覆うように一対の樹脂フィルム40を貼り合わせることで、フラットケーブル1Cが形成される。この構成でも、変形例2と同様に、シールド層30Cからノイズを一括して逃がすことができる。
図10に示すように、フラットケーブル1Dでは、一対の樹脂絶縁層20の導体並列方向における両側端部と一対の樹脂フィルム40の両側端部との位置が略一致している。すなわち、両側端部において、一対の樹脂絶縁層20が露出している。また、シールド層30の両側端部は、樹脂絶縁層20で覆われている。このようなフラットケーブル1Dによれば、第一実施形態と同様に、伝送特性を向上することができる。なお、難燃性の点からは、樹脂絶縁層20の両側端部まで難燃材料を含む樹脂フィルム40で覆われている第一実施形態のフラットケーブル1の構成がより好ましい。例えば、図27に示すように、樹脂絶縁層20の両側端部を樹脂フィルム40の難燃絶縁層44と同様の難燃絶縁材料からなる難燃絶縁層48により覆う構成としても良い。
図12に示すように、フラットケーブル1Fの長さ方向における両端部において、その一面(図12の上面)では、樹脂絶縁層20およびシールド層30が所定長さ除去されており、平角導体10が露出されている(図12において露出箇所を符号Fで示す)。一方、フラットケーブル1Fの他面(図12の下面)では、樹脂絶縁層20が所定長さ除去されており、樹脂絶縁層20が除去された部分の平角導体10とシールド層30との間には、樹脂フィルム40とは別の樹脂フィルム50(第三樹脂フィルムの一例)が介在している。すなわち、樹脂フィルム50は、複数本の平角導体10の露出部分Fの少なくとも一部に貼り合わされているとともに、一方のシールド層30が貼り合わされている。そして、一対のシールド層30の外面から一対の樹脂フィルム40が貼り合わされている。この構成により、樹脂絶縁層20および樹脂フィルム40から露出した状態の平角導体10を、樹脂フィルム50によって補強することができる。本実施形態では、樹脂フィルム50は、樹脂フィルム40と同一の樹脂材料(例えば、ポリエチレンテレフタレート)から構成されているが、平角導体10を補強できるものであれば樹脂フィルム40と異なる材料を用いても良い。
なお、一対の樹脂フィルム40は、平角導体10の樹脂絶縁層20から露出した部分Fの一部をも覆うようにして互いに貼り合わされていることが好ましい。これにより、樹脂絶縁層20が露出することがないため、難燃性を高めることができる。
図14に示すように、フラットケーブル1Hの片面(図14の下面)において、ケーブル長さ方向における両端部には、接地部材60がシールド層30と導通するようにそれぞれ取り付けられる。フラットケーブル1Hの両面(図14の上下面)において、一対の樹脂絶縁層20および一対のシールド層30が所定長さ除去されており、平角導体10が露出されている。そして、平角導体10の露出部分の片面(図14の下面)には、一対のシールド層30のうち一方のシールド層30にまで延出するように所定長の樹脂フィルム50Aが接着されている。なお、この一方のシールド層30は、ケーブル長さ方向の両端部以外の部分Hは、樹脂フィルム50Aに覆われていない。
上記説明した第一の実施形態(および各変形例)の構成に係るフラットケーブルと従来の構成に係るフラットケーブルとについて伝送特性(信号減衰量)に関する比較評価を行った。
図19は、第二実施形態に係るフラットケーブル100の横断面図であり、図20は、フラットケーブル100の長さ方向の端部を示す縦断面図である。なお、フラットケーブル100において、第一実施形態のフラットケーブル1と同様の構成については説明を省略する。また、図19および図20においては、図示の簡便化のため、アンカーコート層35,46の図示は省略している。
図23に示すように、フラットケーブル100Cにおいて、シールド層30が設けられていない側の面(図23の上面)では、樹脂絶縁層20および樹脂フィルム40が所定長さ除去されており、平角導体10が露出されている。一方、シールド層30が設けられている側の面(図23の下面)では、その端部から所定距離だけ内側に入った部分で樹脂フィルム40が例えばレーザ照射により所定長さ除去されており、シールド層30が露出されている。なお、レーザ照射に代えて、樹脂フィルム40が、ラミネートローラによって間隔を空けてシールド層30へ貼り合されることにより、シールド層30の一部を露出させることとしても良い。このシールド層30が露出した部分に接地部材60の一端側が接触している。接地部材60の他端側は、樹脂フィルム70を介して、ケーブル長さ方向の端部側の樹脂フィルム40に貼り付けられている。すなわち、ケーブル長さ方向の端部側の樹脂フィルム40と接地部材60との間に、樹脂フィルム40とは異なる樹脂フィルム70が介在している。この樹脂フィルム70は、変形例5の樹脂フィルム50と同様に、樹脂フィルム40と同一の樹脂材料(例えば、ポリエチレンテレフタレート)から構成されているが、樹脂フィルム40と異なる材料を用いても良い。このように、平角導体10の露出部分に対応するようにして樹脂フィルム40と接地部材60との間に樹脂フィルム70を貼り付けることにより、平角導体10の露出部分や、接地部材60を補強することができる。
図24に示すように、フラットケーブル100Dの長さ方向における端部において、シールド層30が設けられていない側の面(図24の上面)では、樹脂絶縁層20および樹脂フィルム40が所定長さ除去されており、平角導体10が露出されている。一方、シールド層30が設けられている側の面(図24の下面)では、樹脂絶縁層20が所定長さ除去されて、シールド層30が露出されている。そして、この面において、樹脂フィルム40の端部には補強用の樹脂フィルム80が貼り付けられている。樹脂フィルム80は、樹脂フィルム40と同一の樹脂材料(例えば、ポリエチレンテレフタレート)から構成されて得るが、平角導体10を補強できるものであれば樹脂フィルム40と異なる材料を用いても良い。変形例9の場合、変形例6の接地部材60を用いることなく、露出させたシールド層30により接地が行われる。すなわち、フラットケーブル100Dの構成によれば、接地部材60が不要となるため、生産コストの削減や薄型化を実現することができる。
図25に示すフラットケーブル100Eでは、ケーブル長さ方向における端部において、一対の樹脂絶縁層20、片方の樹脂絶縁層20の外面に設けられたシールド層30、一対の樹脂フィルム40が所定長さ除去されており、平角導体10が露出されている。平角導体10の露出部分は、図25における上方側に屈曲されている。また、ケーブル長さ方向の端部において、シールド層30と樹脂フィルム40との間には、シールド層30と導通される接地部材60が設けられている。そして、シールド層30と接地部材60との重なり部分に対応する位置において、樹脂フィルム40の外面が樹脂フィルム90(第二樹脂フィルムの一例)により覆われている。この樹脂フィルム90は、樹脂絶縁層20や樹脂フィルム40から露出された平角導体10の一面(図25の下面)も覆っている。すなわち、樹脂フィルム90は、平角導体10の露出部分の一面側から樹脂フィルム40の接地部材60が設けられた部分にまで延在するように貼り付けられている。樹脂フィルム90は、樹脂フィルム40と同一の樹脂材料(例えば、ポリエチレンテレフタレート)から構成されているが、樹脂フィルム40と異なる材料を用いても良い。なお、接地部材60は図25で紙面に垂直な方向に樹脂フィルム40から突き出していて、その部分でコネクタ等の接続部材の接地端子に電気的に接続することができる。この構成によれば、接地部材60の少なくとも一部を樹脂フィルム40で覆うことで、シールド層30に対する接地部材60の貼り付けを強固にできる。また、樹脂フィルム90により、樹脂フィルム40から突出した平角導体10を補強することができる。
10:平角導体
20:樹脂絶縁層
30:シールド層
35:アンカーコート層
40:樹脂フィルム(第一樹脂フィルムの一例)
42:基材層
44:難燃絶縁層
46:アンカーコート層
50:樹脂フィルム(第三樹脂フィルムの一例)
60:接地部材
70,80:樹脂フィルム
90:樹脂フィルム(第二樹脂フィルムの一例)
R1,R2:ラミネートローラ
Claims (14)
- 並列された複数本の平角導体と、
前記複数本の平角導体の並列面の両面から前記複数本の平角導体を挟み込み、前記複数本の平角導体の長さ方向の端部以外の部分を覆っている一対の樹脂絶縁層と、
前記一対の樹脂絶縁層のうち少なくとも一方の樹脂絶縁層の外面に接触しているシールド層と、
前記一対の樹脂絶縁層または前記シールド層の外面を覆っている接着剤付きの一対の第一樹脂フィルムと、
を備え、
前記一対の樹脂絶縁層のうち前記シールド層が接触している樹脂絶縁層の10GHzにおける誘電正接が0.001以下であり、
前記接着剤または前記一対の第一樹脂フィルムが難燃材料からなる、シールドフラットケーブル。 - 前記複数本の平角導体の並列方向において、前記シールド層の端部が、前記複数本の平角導体のうち最外端の平角導体の端部よりも、前記最外端の平角導体の幅寸法の1/2以上、外側に出ており、
前記シールド層の前記並列方向の端部が、前記樹脂絶縁層で覆われている、請求項1に記載のシールドフラットケーブル。 - 前記複数本の平角導体の並列方向において、前記シールド層の端部が、前記複数本の平角導体のうち最外端の平角導体の端部よりも、前記最外端の平角導体の幅寸法の1/2以上、外側に出ており、
前記シールド層の前記並列方向の端部が、前記第一樹脂フィルムで覆われている、請求項1または請求項2に記載のシールドフラットケーブル。 - 前記長さ方向の端部に取り付けられる接地部材を、さらに備え、
前記シールド層の一部が前記第一樹脂フィルムから露出され、当該露出部分において前記シールド層に前記接地部材が接触している、請求項1から請求項3のいずれか一項に記載のシールドフラットケーブル。 - 前記長さ方向の端部において、前記シールド層が露出されている、請求項1から請求項3のいずれか一項に記載のシールドフラットケーブル。
- 前記長さ方向の端部において、前記複数本の平角導体のそれぞれが、前記樹脂絶縁層から完全に露出されている、請求項1から請求項3のいずれか一項に記載のシールドフラットケーブル。
- 前記長さ方向の端部で前記シールド層の外面に接触して重ねられる接地部材を、さらに備え、
前記第一樹脂フィルムにより、前記シールド層および前記接地部材が覆われている、請求項6に記載のシールドフラットケーブル。 - 前記接地部材の一部が前記第一樹脂フィルムから突出しており、当該突出部分が前記複数本の平角導体と並列されている、請求項7に記載のシールドフラットケーブル。
- 前記第一樹脂フィルムを覆う第二樹脂フィルムを、さらに備え、
前記第二樹脂フィルムは、前記複数本の平角導体の露出部分の少なくとも一部に貼り合されている、請求項7または請求項8に記載のシールドフラットケーブル。 - 前記複数本の平角導体の露出部分の少なくとも一部に貼り合されている第三樹脂フィルムを、さらに備え、
前記第三樹脂フィルムの外面に前記シールド層が貼り合されている、請求項6に記載のシールドフラットケーブル。 - 前記長さ方向における端部において、前記樹脂絶縁層に前記第三樹脂フィルムが貼り合されている、請求項10に記載のシールドフラットケーブル。
- 前記長さ方向の端部において、前記複数本の平角導体の露出部分と、前記シールド層とに貼り合わされている第三樹脂フィルムと、
前記シールド層の外面に接触して重ねられ、且つ、前記第三樹脂フィルムに貼り合わされている接地部材と、
をさらに備えている、請求項6に記載のシールドフラットケーブル。 - 前記平角導体の並列方向における前記樹脂絶縁層の端部の少なくとも一部が、前記第一樹脂フィルムで覆われている、請求項1から請求項12のいずれか一項に記載のシールドフラットケーブル。
- 前記樹脂絶縁層の前記端部の全面が、前記第一樹脂フィルムで覆われている、請求項13に記載のシールドフラットケーブル。
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| KR20190117563A (ko) | 2019-10-16 |
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