CN101540217A - Shielding flat cable and manufacturing method thereof - Google Patents
Shielding flat cable and manufacturing method thereof Download PDFInfo
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- CN101540217A CN101540217A CNA200910126354XA CN200910126354A CN101540217A CN 101540217 A CN101540217 A CN 101540217A CN A200910126354X A CNA200910126354X A CN A200910126354XA CN 200910126354 A CN200910126354 A CN 200910126354A CN 101540217 A CN101540217 A CN 101540217A
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- flat cable
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Abstract
The invention provides a shielding flat cable and a manufacturing method thereof. The shielding flat cable can reliably ground a shielding conductor, prevent un-matching impedance caused by removing the shielding conductor and inhibit decreasing of the shielding effect. Structure of the shielding flat cable is as follows: on at least one face of the flat cable formed by arranging a plurality of conductors (2a) in a line and wrapping the conductors with an insulator (3), a metal foil belt (6) for grounding is longitudinally disposed by adhering, and a metal foil sheet (4) for shielding is used to wrap the foil belt (6) and the insulator (3).
Description
Technical field
The present invention relates to a kind of shielded flat cable and manufacture method thereof, this shielded flat cable is arranged in parallel many conductors and is row and is coated by insulator that its outside is coated by common shielded conductor.
Background technology
In the distribution of distribution in electronic equipment and equipment movable part, be purpose with being connected easy, use to have flexual flat cable with save spaceization.In addition, if, therefore use the shielded flat cable of having taked shielding because the employed signal frequency of equipment uprises, and then The noise becomes big.Shielded flat cable normally is arranged in parallel flat or circular conductor with predetermined distance be row, and the insulator that the integral body utilization is made of electric insulation resin carries out integrated and forms.Then; the outside of insulator coated by common electric conductor and as shielded conductor; in addition, form as required the shape that its outside utilizes the crust that is made of resin to protect (for example, with reference to the spy open flat 8-64037 communique, the spy opens the 2003-16849 communique).
Existing shielded flat cable in order in cable end piece portion the earth terminal of shielded conductor with connector or circuit substrate to be connected, uses drain wire.Drain wire is configured to usually, on the whole length direction of cable with the interior side contacts of the shielded conductor that the insulator of shielded flat cable is coated.The terminal part of shielded flat cable for the portion of terminal with connector or circuit substrate is connected, comes along shielded conductor and crust and removes, and by above-mentioned drain wire shielded conductor is connected with shield terminal ground connection.
Shielded conductor carries out to wire electric the contact vertically with drain wire, and this contact area is less than or equal to half of surface area of drain wire.And, owing to be to obtain contact condition, therefore there is the inadequate situation of electric contact by the coiling of shielded conductor or the coating of crust, the reliability of shielded conductor ground connection is reduced.In addition, owing to remove shielded conductor, therefore might in the area part of having removed this shielded conductor, produce impedance and not match in cable end piece portion.In addition, because function of shielding reduces, therefore there is the problem that transmits jitter.
Summary of the invention
The present invention In view of the foregoing proposes, its purpose is to provide a kind of shielded flat cable and manufacture method thereof, the ground connection that this shielded flat cable carries out shielded conductor reliably connects, and prevents from not match because of the impedance that the removal shielded conductor causes, and suppresses shield effectiveness and reduces.
Shielded flat cable involved in the present invention, in that many conductors are arranged in parallel is at least one face of a flat cable that is listed as and is formed by the coating of insulator one, mode with vertical attaching disposes the metallic foil that ground connection connects usefulness, and metallic foil and insulator are coated by the tinsel that shields usefulness.
The metallic foil that also ground connection can be connected usefulness is configured on the two sides of flat cable, and it is bonded on the insulator.In addition, also can only be configured under the situation on the face of flat cable, shielding is bondd with tinsel another face with flat cable at the metallic foil that ground connection connects usefulness.In addition, when preferably between the metallic foil that insulator is connected usefulness with ground connection, boning between bonding or the tinsel, the pattern of bonding agent with checker plate applied insulator and shielding usefulness.In addition, preferably make insulator form the surface and do not have concavo-convex flat surfaces by extrusion molding.
In addition, can utilize crust that the outside of the tinsel of shielding usefulness is coated, form the structure of protection whole cable.Preferred crust forms by extrusion molding, and in the case, the tinsel that preferable mask is used is made of resin bed and metal foil layer, is set to resin bed and is positioned at the outside, bonds with crust.
In addition, in the cable that does not have crust, on insulator, reel more than or equal to 1.5 weeks forming anti-flammability by the tinsel that will shield usefulness, in having the cable of crust, form crust by hybrid resin and form anti-flammability by polyurethane resin and ethene-vinyl acetate copolymer resins.
In addition, by in insulator, adding the carbon black of 0.4 weight %～0.6 weight %, make and utilize YAG laser that the processing of the metal forming of cable end piece is become easy.In addition, also can constitute crooked limiting part is installed on the position of cable bending, its bending radius is greater than not making above-mentioned metallic foil that the minimum bending radius of cutting off takes place.
In addition, also can make the coiling of the tinsel of described shielding usefulness finish the end bending more than or equal to 3 times.In addition, described insulator also can be non-flame retardant resin.
In addition, the metallic foil that also can make described ground connection connect usefulness has and runs through double-edged a plurality of air vent hole, carries out crosslinked at described insulator.In addition, also can carry out crosslinked at described crust.
In the manufacture method of shielded flat cable involved in the present invention, many conductors are arranged in parallel are row and coat by the insulator one and to form flat cable, on at least one face of described flat cable, vertically attach the metallic foil that ground connection connects usefulness, utilize the tinsel of shielding usefulness to coat described metallic foil and insulator.And, also can utilize crust that described tinsel is coated.Carrying out when crosslinked perforate on metallic foil.
In addition, also can use to have the metallic foil that runs through double-edged a plurality of air vent holes, make described insulator crosslinked by outside irradiation ionization ray from described metallic foil.
In addition, also can utilize tinsel to coat and have the metallic foil that runs through double-edged a plurality of air vent holes, utilize crust that described tinsel is coated then.In addition, also can shine the ionization ray and make described crust and described insulator carry out crosslinked from the outside of described crust.
The effect of invention
According to the present invention, because be the face contact of flatness between the tinsel of the metallic foil of ground connection connection usefulness and shielding usefulness, so electric contact is reliable, and contact area is also bigger.When the metallic foil that makes earth rod be connected usefulness with ground connection contacts, also same as described above.Thus, can shield the ground connection connection of the tinsel of usefulness reliably.In addition, even removed in cable end piece portion under the situation of the tinsel that shields usefulness, also extended to cable end piece, and can prevent that impedance from not matching because ground connection connects the metallic foil of usefulness, and alleviate the reduction of function of shielding, guarantee stability and reliability that signal transmits.
In addition, under the coiling end end with tinsel bends more than or equal to 3 times situation, produce gas even the insulator of tinsel inboard at high temperature is heated, also the coiling end end that can not form from tinsel is fitted spills gas to the outside.In addition,, also can tackle flame, can protect inside not damaged by flame by tinsel even there is the condition of a fire in the outside of shielded flat cable.Therefore, can guarantee high flame retardant.
In addition, undertaken having good thermal endurance under the crosslinked situation at insulator by irradiation ionization ray.And, being formed with on the metallic foil under the situation that runs through double-edged a plurality of air vent holes, the hydrogen that insulator irradiation ionization ray is carried out produced when crosslinked can be discharged, and can not remain between insulator and the metallic foil.Thus, can prevent that metallic foil is from the insulator perk.Like this, can eliminate, can obtain the impedance of desired value because of the impedance locality uprises impedance disorders such as producing spike.
Description of drawings
Fig. 1 is the figure of the summary of explanation shielded flat cable (anoderm) involved in the present invention.
Fig. 2 is the figure of the summary of explanation shielded flat cable (crust is arranged) involved in the present invention.
Fig. 3 is the figure of other example of expression shielded flat cable involved in the present invention.
Fig. 4 is the figure of the relevant execution mode of the explanation bonding with tinsel and metallic foil involved in the present invention.
Fig. 5 is the figure that fire-retardantization to shielded flat cable involved in the present invention describes.
Fig. 6 is near the oblique view of an example of the terminal part of the related shielded type cable of expression other execution mode of the present invention.
Fig. 7 is the profile of section of the shielded type cable of presentation graphs 6.
Fig. 8 is the profile of mode of formation kink of the shielded type cable of presentation graphs 6.
Fig. 9 is near the oblique view of an example of the terminal part of the related shielded flat cable of expression other execution mode of the present invention.
Figure 10 is the approximate vertical view of the air vent hole of expression metallic foil.
Figure 11 is near the oblique view the terminal part that is illustrated under the situation that crust is set on the shielded flat cable of Fig. 9.
Figure 12 is the profile that shielded flat cable rindy is set.
Embodiment
Embodiments of the present invention are described with reference to the accompanying drawings.Among the figure, 1a～1h is a shielded flat cable, and 2a, 2b are conductors, the 3rd, and insulator, the 4th, tinsel (shielded conductor), 4a is a metal foil layer, and 4b is a resin bed, and 4c is a bonding agent, the 5th, crust, the 6th, metallic foil (ground connection connection is used conductor), the 7th, earth rod.
The related shielded flat cable 1a of an embodiment of the invention as shown in Figure 1, it is row that for example that section is flat conductor 2a is arranged in parallel, and these conductors 2a is utilized the insulator 3 mutual electric insulation ground one coatings that are made of insulating resin.On at least one face in the smooth two sides of insulator 3, vertically attach and dispose as ground connection and connect metallic foil 6, reel as the tinsel 4 of shielded conductor in the mode on the whole surface of periphery that covers this metallic foil 6 and insulator 3 with conductor.
The metallic foil 6 that ground connection connects usefulness uses the metallic foil with the width that can cover all conductor 2a that are arranged as the row shape, vertically is attached on the single face or two sides of insulator 3.The tinsel 4 of shielding usefulness is reeled in the mode of coated insulation body 3 and metallic foil 6 integral body, is set on overlapping part closed.Tinsel 4 contacts with the metal foil surfaces that metallic foil 6 is configured to each other.Because the contact-making surface broad, so become the favorable conductive state.
Shielded flat cable 1a utilizes the tinsel 4 as shielded conductor, concentrates the noise signal of shielding from the outside, and shielding is to outside shot noise signal.Tinsel 4 used thicknesses of this shielding usefulness are the tinsel of 0.01mm～0.05mm, can use the tinsel that is made of separately metal formings such as copper or aluminium.In addition, shown in Fig. 1 (B), tinsel 4 also can use following tinsel: form by lamination on resin sheet or evaporation metal paper tinsel, by the tinsel of metal foil layer 4a (7 μ m～25 μ m) and resin bed 4b (4 μ m～25 μ m) formation.In addition, the resin sheet base material of tinsel 4 for example can use polyethylene terephthalate (PET).
As tinsel 4, under the situation of the tinsel that uses the stacked shape that constitutes by metal foil layer 4a and resin bed 4b, with metal foil layer 4a be positioned at the inboard and resin bed 4b be positioned at the outside mode reel, it is fixing to utilize bonding agent 4c to bond to its lap of major general.Therefore, the metal foil layer 4a of tinsel 4 can be connected with metallic foil 6 direct contacts with the ground connection that is configured in the inboard and be electrically connected.In addition, because resin bed 4b is positioned at the outside, metal foil layer 4a can not expose, and therefore even without crust, can have the durability of certain limit as cable yet.
In addition, between insulator 3 and tinsel 4 configuration connect metallic foil 6 as ground connection with conductor, also with the tinsel 4 of shielding usefulness in the same manner, can use metal foil layer is pressed on the resin sheet and improves the metallic foil of intensity.This metallic foil 6 is positioned at the mode in the outside with metal foil layer, vertically attaches contiguously with this insulator 3 on the single face of insulator 3 or two sides, and the coiling by tinsel 4 is held.Because the roughly whole area with metallic foil between the metal forming of the metallic foil 6 of the tinsel 4 of shielding usefulness and ground connection connection usefulness contacts, so form low and good being electrically connected of impedance.
The resin that forms insulator 3 can use polyester, polyvinyl chloride etc., and the preferred polyolefm resinoid for example can use polyvinyl resin etc.The dielectric loss angle tangent of polyvinyl resin is 4 * 10
-4About, dielectric constant is 2.3～2.4, (PET for example, its dielectric loss angle tangent is 2 * 10 with mylar
-3About, dielectric constant is 2.9～3.0) compare lessly, can think preferred material.
The shielded flat cable 1a of formation as noted above, when the portion of terminal with connector or circuit substrate is connected, need make metallic foil 6 that conductor 2a and ground connection connects usefulness endways portion expose.Utilize CO
2Laser, YAG laser etc. form otch on the terminal part of the tinsel 4 that shields usefulness, the metallic foil 6 that its removal is made ground connection connect usefulness exposes.Then, utilize the fore-end of YAG laser ablation metallic foil 6, insulator 3 whole surfaces are exposed.Subsequently, by utilizing CO
2Laser cutting is also removed insulator 3, makes conductor inside 2a expose (omit diagram), on the portion of terminal of connector etc., connects with the state of the arrangement pitches that keeps conductor 2a.
The terminal part of formation as noted above, the metallic foil 6 that ground connection connects usefulness exposes in the one side side at least, along the Width landscape configuration earth rod 7 of this metallic foil 6, metallic foil 6 is contacted with earth rod 7.Earth rod 7 partly is connected with the earth terminal of connector.Because between the metallic foil 6 of ground connection connection usefulness and the earth rod 7 is the face contact,, can guarantee reliable and stable being electrically connected so can keep and fixedly connected state.
In addition, for tinsel 4, in order being connected, to become endways near the removed state portion, but to keep the metallic foil 6 that ground connection connects usefulness in order to carry out ground connection to connect with connector etc. as shielded conductor.Therefore, static capacity and the external inductors that obtains via the insulator between conductor 2a and the tinsel 43 keeps evenly can making this part can not produce impedance and not matching.In addition, the reduction of removing the function of shielding that near the shielding the terminal part causes with tinsel 4 for the part also can alleviate by the metallic foil 6 that ground connection connects usefulness, can make the reliability raising with respect to noise signal.
Shielded flat cable 1b shown in Figure 2 is the cable that the outside with the tinsel 4 of above-mentioned shielded flat cable 1a is coated by crust 5.Because the part except the structure that is coated by crust 5 is actually same structure with structure illustrated in fig. 1, so detailed.
5 pairs of whole cable that comprise tinsel 4 of crust are protected, and also have functions such as its mechanical strength of raising, anti-bending simultaneously.The coating thickness of this crust 5 is about 0.2mm, can be formed by polyvinyl chloride, polyethylene in the same manner with insulator 3, or be formed by hybrid resin of polyurethane resin described later and ethene-vinyl acetate copolymer resins etc.In addition, as crust 5, also can be with resin strip with tack coat in the mode that coats shielded conductor 4 from the two sides clamping and bond and integrated, can also carry out extrusion molding by extruder and form.
Have crust 5, using under the situation of tinsel 4 of the shielding usefulness that is made of metal foil layer and resin bed, tinsel 4 is positioned at the mode that inboard, resin bed 4b be positioned at the outside with metal foil layer 4a and reels.Under the situation that crust 5 is formed by the insulating resin extrusion molding, heat and crust 5 weldings and integrated during by moulding of the resin bed 4b in outside part.If the resin bed 4b welding of crust 5 and tinsel 4 and integrated when then removing crust forming terminal part, can also be removed tinsel 4 integratedly, can improve operation.
Fig. 3 is the figure of the section of expression other shielded flat cable involved in the present invention.Fig. 3 (A) does not have crust, uses strap 2a, metallic foil 6 only is configured in the example on the one side of cable.Fig. 3 (B) has crust, uses round conductor 2b, metallic foil 6 is configured in the example on the two sides of cable.
The coating thickness of insulator 3 is to be determined by the characteristic impedance of the dielectric constant of dielectric resin material and cable.As insulator 3, can form the resin strip that will have a tack coat and be arranged as conductor 2a, the 2b of row shape from the two sides clamping and carry out integratedly, form but preferably carry out extrusion molding by extruder.Under the situation of extrusion molding, because being formed, the two sides of insulator 3 do not have concavo-convex flat surfaces, so and can not produce concavo-convexly in the laminated portions between metallic foil 6 or the tinsel 4, and can make the distributed capacitance between conductor 2a, the 2b constant, make impedance even.
Fig. 4 is the figure of the explanation execution mode relevant with the bonding of tinsel 4 and metallic foil 6.Fig. 4 (A) is the figure of an example of the application pattern of explanation bonding agent involved in the present invention, and Fig. 4 (B) is explanation tinsel and the binding part of metallic foil and the figure of non-binding part.In the drawings, 8 expression bonding reticulate patterns, 8a, 8b represent the bonding reticulate pattern of corynebacterium, 9 expression adhesive surfaces, the non-adhesive surface of 10 expressions.
Preferable alloy paillon foil 4 and metallic foil 6 are as the configuration example of Fig. 1～3 is illustrated, and the maintenance of the spacing distance between conductor 2a, the 2b is constant, and characteristic impedance is uniform on the whole length of cable.Particularly in the cable that does not have crust 5, preferable alloy paillon foil 4 and metallic foil 6 are integrated with insulator 3 bondings.But preferable alloy paillon foil 4 and metallic foil 6 are in electric contact condition, and not bonded to one another.Bonding agent can be coated in tinsel bonded to one another 4 and the insulator 3 on the adhesive surface of any one, and in metallic foil 6 and the insulator 3 on any one the adhesive surface.In addition, bonding agent can use for example polyesters bonding agent.
Above-mentioned bonding need not bond on whole surface in the same manner.Therefore on its adhesive surface, can be with bonding agent with variety of way coatings such as striated, trellis, drops, riffled iron are tabular to bond.But above-mentioned coating shape and coating state may produce variety of issue.For example shown in Fig. 4 (B), adhesive surface 9 and non-adhesive surface 10 between metallic foil 6 and the insulator 3 form oblique reticulate pattern.In this case, if cable is followed the usual practice as the N-N line bending of non-adhesive surface 10, then metallic foil 6 becomes the state in non-adhesive surface 10 places perk, the impedance variation of cable.And,, then might produce folding line and metal forming is ruptured if with this state alternating bending.
Therefore, preferably all certainly exist the application pattern of the such bonding agent of bonding reticulate pattern to any direction bending.Thus, discovery preferably applies according to the pattern of the known checker plate as checkered plates (being also referred to as check board) shown in Fig. 4 (A).The bonding reticulate pattern 8 of this checker plate pattern is corynebacterium bonding reticulate pattern 8a and the 8b alternate configurations with quadrature, and their integral body is tilted with respect to length direction or Width.For example, the width that makes single bonding reticulate pattern 8a, 8b is that 0.5mm, length are about 4.5mm, is coated in any density on the adhesive surface of the adhesive surface of insulator 3 or metallic foil 6 or tinsel 4 sides.According to the bonding reticulate pattern of this checker plate pattern, can not produce the non-adhesive surface 10 of linearity, metallic foil 6 or tinsel 4 can be with the strip perks yet.
In addition, in recent years to the increase in demand of cable with anti-flammability.Fig. 5 is the figure of the configuration example of expression raising cable-flame retardant involved in the present invention.In rindless cable shown in Figure 1, coiling the tinsel 4 and intersection that forms is the narrower coincidence part that keeps reeling condition by bonding.But,, then can make the bonding agent 4c fusing of intersection owing to burning if the coiling coincidence amount of tinsel 4 is less.Like this, the insulator of paper tinsel band inboard gasification and spilling from this intersection, it burns and promotes the burning of prolonging of cable.
Therefore, shown in the preferred shielded flat cable 1e as shown in Figure 5, make the coiling intersection of tinsel 4 become big.The result of test is that if tinsel 4 was reeled for 1.5 weeks, the coincidence side contacts flame from tinsel then can suppress combustion gas leakage.Thus, preferable alloy paillon foil 4 is reeled more than or equal to 1.5 weeks in the periphery of insulator 3, and the intersection of coiling is more than or equal to 0.5 week.In addition,, under the situation of aluminium foil, can produce the hole during thickness of 7 μ m and can't pass through flame retardant test for the metal forming of tinsel 4, need be more than or equal to the thickness of 10 μ m.Under the situation of Copper Foil, just passed through flame retardant test during the thickness of 7 μ m.Therefore, in order to make the thin and raising anti-flammability of tinsel 4, preferably use copper foil.
In addition, in the cable of Fig. 2, use flame-retardant materials, can improve anti-flammability by skin material with crust 5.As the crust of anti-flammability, current use is added with the flame-proof polyethylene or the Corvic of halogen family fire retardant, but from environmental problem, does not contain the increase in demand of the halogen free flame retardant cable of halogen.In the present invention,, use hybrid resin (for example, opening the 2008-117609 communique), realize fire-retardantization of cable with reference to the spy by polyurethane resin and ethylene-vinyl acetate copolymer (EVA) resin as the crust 5 of cable.
The weight ratio of optimization polyurethane resin and EVA resin is 40: 60～90: 10, and the VA content of EVA is 50～90 weight %.Preferably, contain metal hydroxides 40～250 weight portions such as magnesium hydroxide or aluminium hydroxide with respect to these hybrid resin 100 weight portions.Under situation, as long as tinsel 4 partially overlaps by the crust 5 clad metal paillon foils 4 of anti-flammability.
When being formed for carrying out connector connection etc. terminal, preferably use the metal forming of YAG laser cutting shielding with tinsel 4.In addition, CO is used in the cut-out of insulator 3 usually
2Laser.But,, then when utilizing YAG laser cutting metal forming, make insulator 3 conductor inside aging sometimes if insulator 3 is transparent or Natural color.On the other hand, if insulator 3 is painted and make YAG laser be difficult to see through, then be difficult to utilize CO subsequently
2 Laser cutting insulator 3.
In the present invention, preferably add carbon black in insulator 3, the color that makes insulator 3 is a light/dark balance.In addition, the addition of carbon black is preferably (0.4 weight %～0.6 weight %) about 0.5wt%.So long as the carbon black addition of above-mentioned degree, YAG laser just can not influence conductor inside 2a, can only cut off tinsel 4.In addition, can utilize CO
2Laser cuts off insulator 3 reliably.
In addition, for having the flat cable of shielding with tinsel 4, no matter whether have crust 5, if carry out bending (to be less than or equal to the bending that the minimum bend diameter carries out) terrifically, all might on the metal foil layer 4a of tinsel 4, produce the be full of cracks and cut off.Therefore, can not be bent to the bending radius that radius is less than or equal to regulation in order to make cable, preferably carry out having crooked limiting unit on the bent position, its bending radius that makes cable is greater than not making tinsel 4 that the minimum bending radius of cutting off takes place.
In the present invention, avoid making cable to carry out crooked crooked limiting part with the bending diameter that is less than or equal to regulation, being arranged on expectation by bonding etc. will carry out on the bent position.Crooked limiting part can be formed by the bar-like member of cylinder, cylinder, semicircular cylinder, semicolumn.In addition, the radius of the flexure plane of above-mentioned crooked limiting part can be set at, and for example with respect to 90 ° bending of cable, bending radius is about 1.5mm, and with respect to 180 ° bending, bending radius is about 2.5mm.
The shielded flat cable of formation as noted above has function of shielding, and the electromagnetic radiation that it suppresses to the outside suppresses the electromagnetic radiation from external equipment simultaneously, can be applied to use the distribution of electronic equipment of high-frequency signal and the distribution of movable part.In addition, can be with conductor all as holding wire, also can be with a part wherein as supply lines.In addition, also can be used as differential transmission cable, it utilizes a pair of holding wire with anti-phase transmission data-signal when transmitting at a high speed signal such as numerical data.As this differential transmission with under situation of cable, can be with adjacent pair of conductors as holding wire, with the conductor of its both sides as earthing conductor, with prevent and adjacent holding wire between produce crosstalk.
Fig. 6 and Fig. 7 represent near the example of terminal part of the shielded flat cable 1f that other execution mode of the present invention is related.
In kink 40, the metal foil layer 4a of tinsel 4 carries out plastic deformation respectively on three crooked place, keep bending state securely.Therefore, even when VW-1 tests, shielded flat cable 1f is heated and internally insulator 3 produces gases, and bending state also can not be opened, and can not make gas leak to the outside from kink 40.Therefore,, can prevent that also shielded flat cable 1f prolongs burning in the longitudinal direction when VW-1 tests, can satisfy the standard of VW-1 test even insulator is combustibles such as polyethylene.
Below, the manufacture method of shielded flat cable 1f is described.Tinsel 4 is positioned at the mode that inboard, resin bed 4b be positioned at the outside with its metal foil layer 4a and reels.At this moment, shown in Fig. 8 (a), will vertically attach and reel and the coiling that forms finishes end 40a fit each other (overlapping or bonding).Then, shown in Fig. 8 (b), the coiling after fitting is finished end 40a bend once, form kink 40b in the end side of Width.Then, shown in Fig. 8 (c), continuation bends coiling terminal part 40a, and 40b is involved in the inboard with kink, forms kink 40c.Then, shown in Fig. 8 (d), 40a bends with the coiling terminal part, once more kink 40c is involved in the inboard, and does not outwards lean out with respect to the width of insulator 3.Thus, the coiling with tinsel 4 finishes end 40a bending 3 times and forms kink 40.
Thus, can obtain shielded flat cable 1f, even produce gas from insulator 3 when burning test, bending state can not opened yet, and can not make gas leak to the outside from kink 40.In addition, the bending number of times of kink 40 also can be more than or equal to 3 times, on be limited to about 10 times.In addition, when becoming the state of Fig. 8 (d),, can prevent further that bending state from opening by kink 40 is bonded on the tinsel 4 finish end 40a to bend for the last time to reeling from the state of Fig. 8 (c).
As concrete example, in the shielded flat cable 1f of form shown in Figure 6, conductor 2a uses width to be 0.3mm, the thickness tin annealed copper wire as 0.05mm.Insulator 3 uses polyethylene, and thickness is 0.16mm.Metallic foil 6 uses the copper PET band (thickness of copper: 9 μ m; The thickness of PET: 12 μ m), and utilize polyethylene kind bonding agent and insulator 3 bondings.Tinsel 4 uses the copper PET band (thickness of copper: 9 μ m; The thickness of PET: 12 μ m), the width of kink 40 is 5mm.At the bending number of times that makes kink 40 is under the situation of 3 times or 5 times, can satisfy the standard of VW-1 test.On the other hand, be under 2 times the situation at the bending number of times that makes kink 40, can't satisfy the standard of VW-1 test.
Fig. 9 is near the oblique view of an example of the terminal part of the related shielded flat cable 1g of expression other execution mode of the present invention.
In order to realize low-loss, the insulator 3 of shielded flat cable 1g uses the low vistanex of dielectric constant, determines insulation thickness according to the dielectric constant of dielectric resin material and the characteristic impedance of cable.As insulator 3, also can form from the two sides by side by side conductor 2a of the resin strip clamping with tack coat and integrated, form but preferably carry out extrusion molding by extruder.Under the situation of extrusion molding, because being formed, the two sides of insulator 3 do not have concavo-convex flat surfaces, so and metallic foil 6a between adhesive surface on can not produce concavo-convex, therefore and the distributed capacitance between the conductor 2a constant, can form uniform impedance.In addition, it is crosslinked that this insulator 3 can utilize the irradiation of ionization ray to carry out, and has good thermal endurance thus.
On the metallic foil 6a of shielded flat cable 1g, shown in Figure 10 (a), be formed with and run through double-edged a plurality of air vent hole 11.These air vent holes 11 are for example with diameter 0.1mm and the mutual interval across about 1mm and forming.In addition, as these air vent holes 11, shown in Figure 10 (b), also can alongst form respectively and run through double-edged a plurality of slit with the canine tooth shape.
Below, the manufacture method of above-mentioned shielded flat cable 1g is described.When making above-mentioned shielded flat cable 1g, at first, it is row that many conductor 2a are arranged in parallel, and their are utilized the insulator 3 one coating that is made of vistanex.And, connect the metallic foil 6a of usefulness by the ground connection that will be pre-formed a plurality of air vent holes 11, in the outside of insulator 3, bonding and being attached on the whole length direction except end, thus coat two sides by metallic foil 6.
Then, the outside irradiation ionization ray from metallic foil 6a makes inner insulator 3 carry out crosslinked.As the ionization ray, having electron ray irradiation or cobalt irradiation is radiation gamma etc.Thus, insulator 3 is undertaken crosslinked by the irradiation that utilizes the ionization ray, thereby has good thermal endurance.
The as noted above manufacturing then produces hydrogen from, the insulator 3 that is made of vistanex that decomposes crosslinked by the irradiation of ionization ray.Then, this hydrogen is discharged to the outside by the air vent hole 11 of metallic foil 6a.
Therefore, can not remain between insulator 3 and the metallic foil 6a at hydrogen crosslinked, that produce when decomposing, but discharge to the outside of metallic foil 6a.Thus, can prevent that metallic foil 6a is from insulator 3 perks.Can eliminate because of perk causes the impedance part to uprise and produce spike impedance disorders such as (spikes of about 7 Ω), can obtain the impedance of desired value.
And, according to above-mentioned manufacture method, preferably insulation attach during operation metallic foil 6a this continuously shaped after, to insulator 3 irradiation ionization rays, wherein, this insulation operation is meant utilizes insulator 3 with the incorporate operation of conductor 2a.
Figure 11 is near the oblique view the terminal part of the outside that is illustrated in the metallic foil 6a of the shielded flat cable 1g shown in Figure 9 shielded flat cable 1h that is provided with crust 5.As shielded flat cable 1h, there is the outer integumentary pattern of the PET shown in the outer integumentary pattern of armouring (sheath) shown in Figure 12 (a) and Figure 12 (b) with crust 5.
Outside armouring among the shielded flat cable 1h with crust 5 of integumentary pattern, shown in Figure 12 (a), the subsides aluminium PET that aluminium foil laminate is formed on the resin sheet that is made of polyethylene terephthalate (PET) is with 21, around being wound on by so-called stratiform, coat to form by extruding of resin then and extrude crust 22.As the resin of extruding crust 22, can use copolymer, polyester, polyurethane etc. such as polyolefin (polyethylene or polypropylene), PVC, EVA and EEA.
Outside PET, among the shielded flat cable 1h with crust 5 of integumentary pattern, shown in Figure 12 (b), copper foil layer is pressed in the copper-surfaced PET that forms on the resin sheet that is made of polyethylene terephthalate (PET) is with 23, around being wound on by so-called stratiform.Under the situation of above-mentioned any one shielded flat cable 1h with above-mentioned crust 5, in the man-hour that adds of carrying out terminal part, as long as utilize CO
2Laser cutting is also removed crust 5 and is got final product.
When making above-mentioned shielded flat cable 1h with crust 5, at first, it is row that many conductor 2b are arranged in parallel, and their are utilized the insulator 3 one coating that is made of vistanex.And, connect the metallic foil 6a of usefulness by the ground connection that will be pre-formed a plurality of air vent holes 11, in the outside of insulator 3, bonding and being attached on the whole length direction except end, thus coat the two sides by metallic foil 6a.
Then, utilize extrude coat or roll of strip around and crust 5 is coated on the periphery of metallic foil 6a.For the operation that forms crust 5, carry out afterwards on the two sides that can and then metallic foil 6a be attached at insulator 3, after also the cable that is pasted with metallic foil 6a temporarily can being wound up, carries out in other operations.Form crust 5 by extruder by extrusion molding, compare, can improve linear speed, boost productivity with applying by resin strip etc.In order making to attaching metallic foil 6a on the insulator 3 under the situation that linear speed reduces,, and then to pull out and extrude coating and get final product with high linear speed as long as will be pasted with the cable of metallic foil 6a temporarily winds up.
Then, the outside irradiation ionization ray from crust 5 makes crust 5 and inner insulator 3 carry out crosslinked.Thus, can make crust 5 and insulator 3 have good thermal endurance.At this moment, from, the insulator 3 that by vistanex constitute that decompose crosslinked, produce hydrogen by the irradiation of ionization ray.This hydrogen is discharged to the outside of metallic foil 6a via the air vent hole 11 of metallic foil 6a.
Thus, can not remain between insulator 3 and the metallic foil 6a at hydrogen crosslinked, that produce when decomposing.Therefore, can prevent metallic foil 6a perk from the insulator 3, can eliminate because of perk causes the impedance part and uprise impedance disorders such as producing spike, can obtain the impedance of desired value.
For example, the diameter at air vent hole 11 shown in Figure 10 (a) is 0.4mm, A is 1.75mm at interval, B is that aperture opening ratio is about 4.5% under the situation of 1.5mm at interval, about the whole raising of impedance 1.5 Ω, can not produce spike.In addition, for example, be 1.0mm if make the diameter of the air vent hole 11 shown in Figure 10 (a), then aperture opening ratio becomes approximately 30%, and impedance is whole to improve about 5 Ω, can not produce spike.In addition, in above-mentioned example, impedance is become greatly correspondingly, make the thickness attenuation of insulator 3 and the impedance (for example, 100 Ω) that obtains to stipulate.
In addition, each inscape of the shielded flat cable 1a～1h of the respective embodiments described above can suitably make up.
Claims (19)
1. a shielded flat cable is characterized in that,
Many conductors are being formed a line abreast and coating by the insulator one at least one face of the flat cable that forms, mode with vertical attaching disposes the metallic foil that ground connection connects usefulness, utilizes the tinsel of shielding usefulness to coat described metallic foil and insulator.
2. shielded flat cable according to claim 1 is characterized in that,
The metallic foil that described ground connection connects usefulness is bonded on the described insulator.
3. shielded flat cable according to claim 1 and 2 is characterized in that,
The metallic foil that described ground connection connects usefulness is configured on the two sides of described flat cable.
4. shielded flat cable according to claim 1 is characterized in that,
The metallic foil that described ground connection connects usefulness only is configured on the face of described flat cable, and is bonded on the described insulator, another face bonding of the tinsel of described shielding usefulness and described flat cable.
5. according to claim 2 or 4 described shielded flat cables, it is characterized in that,
Bonding agent is applied with the checker plate pattern, be used to make described insulator and described ground connection to connect between the metallic foil of usefulness and bond, perhaps be used to make between the tinsel of described insulator and described shielding usefulness bond.
6. according to claim 1,2 or 4 described shielded flat cables, it is characterized in that,
Described insulator forms by extrusion molding.
7. according to claim 1,2 or 4 described shielded flat cables, it is characterized in that,
The outside of the tinsel of described shielding usefulness is coated by crust.
8. shielded flat cable according to claim 7 is characterized in that,
Described crust forms by extrusion molding.
9. shielded flat cable according to claim 7 is characterized in that,
Described crust is that the hybrid resin by polyurethane resin and ethene-vinyl acetate copolymer resins forms.
10. according to claim 1,2 or 4 described shielded flat cables, it is characterized in that, in described insulator, be added with the carbon black of 0.4 weight %～0.6 weight %.
11. according to claim 1,2 or 4 described shielded flat cables, it is characterized in that,
The tinsel of described shielding usefulness an enterprising line bend in position, is equipped with crooked limiting part at least on bending position, its bending radius that makes described tinsel is greater than not making described tinsel that the minimum bending radius of cutting off takes place.
12. according to claim 1,2 or 4 described shielded flat cables, it is characterized in that, the coiling of the tinsel of described shielding usefulness finished the end bending more than or equal to 3 times.
13. shielded flat cable according to claim 12 is characterized in that, described insulator is non-flame retardant resin.
14. according to claim 2 or 4 described shielded flat cables, it is characterized in that,
The metallic foil that described ground connection connects usefulness has and runs through double-edged a plurality of air vent hole, carries out crosslinked at described insulator.
15. shielded flat cable according to claim 14 is characterized in that,
The outside of described metallic foil is coated by crust, carries out crosslinked at described crust.
16. the manufacture method of a shielded flat cable is characterized in that,
Many conductors are arranged in parallel are row and coat by the insulator one and to form flat cable, on at least one face of described flat cable, vertically attach the metallic foil that ground connection connects usefulness, utilize the tinsel of shielding usefulness to coat described metallic foil and insulator.
17. the manufacture method of shielded flat cable according to claim 16 is characterized in that,
Utilize crust to coat described tinsel.
18. the manufacture method of shielded flat cable according to claim 16 is characterized in that,
Described metallic foil has and runs through double-edged a plurality of air vent hole, and by the outside irradiation ionization ray from described metallic foil, it is crosslinked that described insulator is carried out.
19. the manufacture method of shielded flat cable according to claim 17 is characterized in that,
Described metallic foil has and runs through double-edged a plurality of air vent hole, and the outside irradiation ionization ray by from described crust makes described crust and described insulator carry out crosslinked.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008051592 | 2008-03-03 | ||
| JP2008051592 | 2008-03-03 | ||
| JP2008195757 | 2008-07-30 | ||
| JP2009006989 | 2009-01-15 | ||
| JP2009006996 | 2009-01-15 |
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| Publication Number | Publication Date |
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| CN101540217A true CN101540217A (en) | 2009-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200910126354XA Pending CN101540217A (en) | 2008-03-03 | 2009-03-03 | Shielding flat cable and manufacturing method thereof |
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| Country | Link |
|---|---|
| JP (1) | JP5309766B2 (en) |
| CN (1) | CN101540217A (en) |
Cited By (7)
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| CN102570127A (en) * | 2010-12-15 | 2012-07-11 | 富士康(昆山)电脑接插件有限公司 | Electric connector |
| CN105741925A (en) * | 2016-01-14 | 2016-07-06 | 东莞市蓝姆材料科技有限公司 | Double-sided conducting metal foil film belt and cable employing same |
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| CN107799930A (en) * | 2016-08-31 | 2018-03-13 | 住友电气工业株式会社 | Shielded flat cable |
| CN110556200A (en) * | 2018-06-01 | 2019-12-10 | 凡甲电子(苏州)有限公司 | Flat data transmission cable |
| CN110556204A (en) * | 2018-06-01 | 2019-12-10 | 凡甲电子(苏州)有限公司 | Flat data transmission cable |
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| JP5593734B2 (en) * | 2010-03-01 | 2014-09-24 | 住友電気工業株式会社 | Shielded flat cable, shielded flat cable with connector, and manufacturing method thereof |
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| JP2018181565A (en) * | 2017-04-11 | 2018-11-15 | 東京特殊電線株式会社 | Flat cable with shield layer |
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| JP2002231063A (en) * | 2001-01-31 | 2002-08-16 | Fujikura Ltd | Shielded flat cable and its manufacturing method |
| JP4044766B2 (en) * | 2002-02-04 | 2008-02-06 | 株式会社オートネットワーク技術研究所 | Flat shielded cable |
| JP2006156079A (en) * | 2004-11-29 | 2006-06-15 | Matsushita Electric Ind Co Ltd | Flexible flat cable |
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2009
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| US10170217B2 (en) | 2011-10-31 | 2019-01-01 | 3M Innovative Properties Company | Edge insulation structure for electrical cable |
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| US9899126B2 (en) | 2011-10-31 | 2018-02-20 | 3M Innovative Properties Company | Edge insulation structure for electrical cable |
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| CN107799930A (en) * | 2016-08-31 | 2018-03-13 | 住友电气工业株式会社 | Shielded flat cable |
| CN110556200A (en) * | 2018-06-01 | 2019-12-10 | 凡甲电子(苏州)有限公司 | Flat data transmission cable |
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Also Published As
| Publication number | Publication date |
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| JP2009238722A (en) | 2009-10-15 |
| JP5309766B2 (en) | 2013-10-09 |
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Application publication date: 20090923 |