JP6906353B2 - Flat cable - Google Patents

Description

The present invention relates to a flat cable that is used for wiring in an electronic device, wiring for a moving part of a device, and the like to block external noise. More specifically, the present invention relates to a flat cable that does not cause a short circuit or the like even if the widthwise end portion of the flat cable comes into contact with other parts when the flat cable is incorporated in an electronic device or the like.

Flat cables are excellent in workability and flexibility, and are widely used as internal wiring for electronic devices, wiring materials for moving parts of devices, and the like. A flat cable needs to be shielded against electromagnetic waves, and various shielded flat cables (also referred to as shielded flat cables) have been proposed.

For example, in Patent Document 1, four or more flat conductors are arranged on one plane, and insulating films are attached from above and below the arrangement surface to insulate the flat conductors, a layer is provided outside the insulating film, and the interposition is provided. A shield flat cable having a shield layer outside the layer has been proposed. In FIG. 2 of the same document, the shield film is wound around the entire circumference of the flat cable, and in FIGS. 3 and 4, the shield film is attached to both sides or one side of the flat cable.

Japanese Unexamined Patent Publication No. 2013-140716

When a flat cable is installed in an electronic device and the widthwise end of the flat cable comes into contact with other parts, if metal is exposed at the widthwise end, it may short-circuit with other parts. May wake up.

The present invention has been made to solve the above problems, and an object of the present invention is that when a flat cable is incorporated into an electronic device or the like, the widthwise end of the flat cable comes into contact with other parts. Is also to provide a flat cable that does not cause problems such as short circuits.

The flat cable according to the present invention has a main body portion and terminal portions located on both sides in the longitudinal direction of the main body portion, and has a plurality of conductors arranged side by side in the width direction at predetermined intervals and two layers sandwiching the conductors. The adhesive insulating layer, the resin film sandwiching the two adhesive insulating layers, the metal foil tape provided on at least one of the resin films and covering all the conductors in the width direction, and the metal foil tape. A flat cable with at least a protective film to cover
In the width direction, the length of the metal foil tape is W1, the length from end to end of the juxtaposed conductors is W2, the length of the resin film is W3, and the length of the protective film. Is W4, and the relationship of W2 ≦ W1 <W4 ≦ W3 is satisfied.

According to the present invention, since the length W1 of the metal foil tape covering all the conductors is larger than the length W2 from one end of the conductor to the other in the width direction, the action and effect of the shield and the like can be ensured. Further, since the length W3 of the resin film and the length W4 of the protective film are larger than the length W1 of the metal foil tape, the resin film and the protective film which are longer in the width direction than the metal foil tape are sandwiched from above and below. Further, as a result, since the metal foil tape is not exposed at the widthwise end of the flat cable, even if the widthwise end of the flat cable comes into contact with other parts, problems such as a short circuit do not occur.

In the flat cable according to the present invention, it is preferable that the relationship of (W1 + 10T) ≤ W4 is satisfied when the thickness of the metal foil tape is T. According to the present invention, since the length W4 of the protective film is equal to or larger than the length W1 of the metal foil tape plus 10T (W1 + 10T), the length is the adhesion allowance (adhesion allowance) between the protective film and the resin film. The protective film and the resin film are firmly adhered to each other as a glue allowance), and the metal leaf tape can be prevented from being exposed due to the peeling of the protective film.

In the flat cable according to the present invention, the thickness of the metal foil tape is preferably in the range of 25 μm or more and 150 μm or less.

In the flat cable according to the present invention, an intervening layer may be provided between the resin film and the metal foil tape.

In the flat cable according to the present invention, the metal foil tape may be provided on both sides.

According to the present invention, it is possible to provide a flat cable that does not cause a short circuit or other trouble even if the widthwise end portion of the flat cable comes into contact with other parts when the flat cable is incorporated in an electronic device or the like. ..

It is a schematic cross-sectional view which shows an example of one end part in the longitudinal direction of the flat cable which concerns on this invention. It is a schematic cross-sectional view which shows the other example of one end part in the longitudinal direction of the flat cable which concerns on this invention. It is explanatory drawing of the width direction length of each component in the width direction cross section of the flat cable which concerns on this invention.

Hereinafter, the flat cable according to the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments.

[Flat cable]
As shown in FIGS. 1 and 2, the flat cable 10 according to the present invention is a flat cable used for wiring in an electronic device or the like and connected to a connector or the like. Specifically, it has a main body portion 31 and terminal portions 11 located on both sides of the main body portion 31 in the longitudinal direction Y, and sandwiches the conductor 1 with a plurality of conductors 1 arranged side by side in the width direction X at predetermined intervals. A two-layer adhesive insulating layer 2, a resin film 3 sandwiching the two layers of the adhesive insulating layer 2, a metal foil tape 6 provided on at least one of the resin films 3 and covering all the conductors in the width direction X, and the like. It has at least a protective film 8 that covers the metal foil tape 6. Then, in the width direction X, the length of the metal foil tape 6 is W1, the length from the end 1a to the end 1b of the juxtaposed conductors 1 is W2, the length of the resin film 3 is W3, and the protective film. When the length of 8 is W4, it is characterized in that the relationship of W2 ≦ W1 <W4 ≦ W3 is satisfied.

Since the dimensions of each element in the width direction of the flat cable 10 satisfy the above relationship, the length W1 of the metal leaf tape covering all the conductors is larger than the length W2 from the end 1a to the end 1b of the conductor 1, and as a result, The action and effect of the shield etc. can be guaranteed. Further, since the length W3 of the resin film and the length W4 of the protective film are larger than the length W1 of the metal foil tape, the resin film and the protective film which are longer in the width direction than the metal foil tape are sandwiched from above and below. .. As a result, since the metal leaf tape is not exposed at the widthwise end of the flat cable, problems such as short circuit do not occur even if the widthwise end of the flat cable comes into contact with other parts.

Hereinafter, each component of the flat cable will be described.

<Conductor>
As shown in FIGS. 1 and 2, the conductor 1 is a plurality of conductors extending in the longitudinal direction Y of the flat cable 10, and is sandwiched from both sides by an adhesive insulating layer 2 described later and is parallel (also referred to as “side by side”). . The same shall apply hereinafter.) Multiple good conductive metal conductors. The type of the conductor 1 is not particularly limited, but a good conductive metal conductor such as a copper wire, a copper alloy wire, an aluminum wire, an aluminum alloy wire, or a copper-aluminum composite wire, or a conductor whose surface is plated is preferable. Can be mentioned. From the viewpoint of high frequency transmission, copper wire and copper alloy wire are particularly preferable. Examples of the plating include solder plating, tin plating, gold plating, silver plating, nickel plating and the like. The cross-sectional shape of the conductor 1 is not particularly limited, and various conductors such as a round wire having a circular cross-sectional shape and a flat wire having a rectangular cross-sectional shape (also referred to as a rolling line or a slitter line) can be applied. The diameter and cross-sectional area of the conductor 1 are not particularly limited, but a round wire having a diameter of 0.1 mm or more and 0.3 mm or less or a round wire thereof is rolled or the like to have a thickness of 0.03 mm or more and 0.1 mm or less and a width of 0. A flat wire having a diameter of 2 mm or more and 0.8 mm or less can be preferably mentioned. The distance between the conductors 1 when arranged in parallel is not particularly limited, but may be, for example, about 0.5 mm. W2 shown in FIG. 3 represents the length from the end 1a to the end 1b of a plurality of conductors arranged side by side.

An insulating film (not shown) may be provided on the surface of the conductor 1. The type and thickness of the insulating film are not particularly limited, but those that decompose well at the time of soldering are preferable, and for example, a thermosetting polyurethane film or the like can be preferably used. Since the conductors 1 provided with the insulating film are insulated from each other, it is possible to prevent an electrical short circuit between the conductors.

<Adhesive insulation layer>
As shown in FIGS. 1 to 3, the adhesive insulating layer 2 is an insulating layer that sandwiches a plurality of conductors 1 arranged in parallel (side by side) at intervals in the width direction X of the flat cable 10. Has sex. Since the adhesive insulating layer 2 has adhesiveness, the adhesive insulating layers are bonded to each other and adhered to each other, and are also adhered to the conductor 1. The adhesive insulating layers 2 and 2 sandwiching the conductor 1 may be an adhesive foamed insulating layer or an adhesive non-foamed insulating layer, and are not particularly limited. For example, the conductor 1 may be sandwiched between a pair of adhesive non-foamed insulating layers, the conductor 1 may be sandwiched between a pair of adhesive foamed insulating layers, one is an adhesive foamed insulating layer, and the other is bonded. The conductor 1 may be sandwiched as a non-foamed insulating layer.

As the constituent resin of the adhesive insulating layer 2, those used as the adhesive insulating layer of the flat cable can be arbitrarily used, and examples thereof include polyphenylene ether resin and its copolymer, polystyrene resin and its copolymer. , Polyolefin resin and copolymers thereof and the like. These resins are included in the case of being used alone, and also in the case of copolymerizing two kinds of resins such as a copolymer of a polyphenylene ether resin and a polystyrene resin. As the polyolefin resin, high-strength polypropylene or polypropylene copolymer can be preferably used. The polyphenylene ether resin may be modified or non-modified, but a non-modified one is preferable.

The constituent resin may contain additives such as a foaming agent, a flame retardant, a flame retardant aid, a blocking agent, an anti-shrinkage agent, and a colorant. The foaming agent is added when the adhesive insulating layer 2 is foamed to reduce the dielectric constant, and can be adopted from general chemical foaming agents and physical foaming agents. As the flame retardant, a bromine-based flame retardant, a flame-retardant inorganic filler, or the like can be used. As the flame retardant aid, antimony trioxide, silicon dioxide and the like can be preferably mentioned. In addition, silicon dioxide and the like act as a blocking agent as well as an anti-shrinkage agent, and thus can be preferably used. It is preferable that the additive is blended within a range that does not impair the effects (adhesiveness, insulating property, etc.) of the obtained adhesive insulating layer 2 and exhibits the function of the additive.

The thickness of the adhesive insulating layer 2 is not particularly limited, but in the case of the non-foamed adhesive insulating layer 2, it may be within the range of, for example, 25 μm or more and 45 μm or less, and in the case of the foamed adhesive insulating layer 2, it may be. It may be thicker than, for example, up to about 60 μm. Further, the terminal portion 11 is provided so that one of the resin films 3 sandwiching the conductor 1 is retracted by the length L2 together with the adhesive insulating layer 2 described above. As shown in FIGS. 1 and 2, L2 is the exposed length of the conductor of the terminal portion 11, and is electrically connected to the connector terminal at this portion.

<Resin film>
As shown in FIGS. 1 to 3, the resin film 3 is arranged so as to sandwich the above-mentioned two layers of the adhesive insulating layer 2. The resin film 3 is not particularly limited, and various films used for general flat cables can be used. In particular, it is preferably one having properties such as flexibility and abrasion resistance, and for example, polyester films such as polyethylene terephthalate (PET) film and polyethylene naphthalate (PEN) film are preferably used. The thickness of the resin film 3 is not particularly limited, but is preferably in the range of, for example, 12 μm or more and 50 μm or less.

The resin film 3 may be a non-foamed resin film 3 or a foamed resin film 3. The foamed resin film 3 can reduce the dielectric constant. The foamed resin film 3 can be produced by containing an arbitrary foaming agent as described in the explanation column of the adhesive insulating layer 2. The thickness of the resin film is not particularly limited, but the non-foamed resin film 3 may be in the range of 12 μm or more and 50 μm or less, and the foamed resin film 3 may be thicker than that, for example, 150 μm. It may be as thick as possible.

Since the resin film 3 is usually integrated with the adhesive insulating layer 2 as described above, the adhesive insulating layer 2 is bonded by adhering the side provided with the adhesive insulating layer 2 toward the conductor side. And the resin film 3 can be provided so as to sandwich the conductor at the same time. Therefore, normally, the adhesive insulating layer 2 does not protrude from the widthwise end portions 3c and 3c of the resin film 3. W3 shown in FIG. 3 represents the length of the resin film 3 in the width direction X, and this length W3 is the total length of the flat cable 10 in the width direction X.

<Intervening layer>
As shown in FIGS. 1 and 2, the interposition layer 4 is arbitrarily provided on one (FIG. 1) or one (FIG. 2) of the resin film 3 as needed. For example, the resin film 3 and the metal leaf described later are provided. It is preferably provided between the tape 6 and the tape 6. Since the intervening layer 4 has adhesiveness, it is convenient when the metal foil tape 6 is attached onto the resin film 3. Further, the intervening layer 4 can also function as a dielectric layer having a function as an impedance control layer, and also has a role of finely adjusting the impedance of the flat cable by adjusting the distance between the conductor 1 and the metal foil tape 6. Have.

Since the intervening layer 4 has a function as an impedance control layer, it can be adjusted to an arbitrary dielectric property or the like. The constituent resin may be a foamed resin or a non-foamed resin as long as it is a resin material that realizes the required dielectric properties and the like. Examples of the resin material include the above-mentioned polyphenylene ether resin, polyolefin resin such as high-density polypropylene (PP), polyester resin, and resin composition such as polyacrylic resin. The foaming agent used for forming the foaming resin is not particularly limited, but can be arbitrarily selected from general chemical foaming agents and physical foaming agents. When the interposition layer 4 is a foaming resin, the foaming agent is not particularly limited, but it can be produced by containing an arbitrary foaming agent as described in the explanation column of the adhesive insulating layer 2. As the interposition layer 4, those used as a so-called adhesive tape can be preferably used, and the thickness thereof is not particularly limited, but may be, for example, within the range of 50 μm or more and 300 μm or less. When the intervening layer 4 is provided, it is desirable that the length X of the intervening layer 4 in the width direction is the same as or substantially the same as the length W1 of the metal foil tape 6 described later.

<Reinforcing material>
As shown in FIGS. 1 to 3, the reinforcing material 5 is arbitrarily formed on the back surface (metal foil tape side) of the resin film 3 extending to the end portion 11a in the longitudinal direction with a length L1 from the end portion 11a. It is provided and acts as a reinforcement when connecting the flat cable 10 to the connector. It is desirable that the reinforcing material 5 is provided, but it may not be provided. As shown in the figure, the end portion 11a of the flat cable 10 has one resin film 3 of the two resin films 3 sandwiching the conductor 1 extending to the end portion 11a of the terminal portion 11, and the other resin film 3 is the conductor 1. It extends to the resin film end 11b in front of the end 11a in order to expose. The reinforcing material 5 is processed to a predetermined length L1 so as to exert the above action, and is attached to the back surface of the resin film 3 extending to the end portion 11a of the terminal portion 11. The portion to which the reinforcing material 5 is attached is the connection portion to the connector. The reinforcing member 5 is provided with the same width as or substantially the same width as the width direction X of the end portion 11a. That is, it is desirable that the length of the reinforcing material 5 in the width direction X is about the same as the length W3 of the resin film 3 in the width direction X described above.

As the reinforcing material 5, a polyethylene terephthalate (PET) film is preferable, and a heat-resistant film such as a polyimide film is preferable when heat resistance is required. For example, a heat-resistant reinforcing tape having a polyimide film with an adhesive layer such as a thermoplastic polyester type, a thermoplastic polyimide type, or an epoxy type can be mentioned. The thickness of the reinforcing material 5 is not particularly limited, but may be, for example, about 0.05 to 0.5 mm.

<Metal leaf tape>
The metal foil tape 6 is provided on one (FIG. 1 and 3) or both (FIG. 2) of the resin film 3 and covers all the conductors in the width direction X. That is, it may be provided on each of the two resin films 3 provided so as to sandwich the conductor 1 (see FIG. 2), or may be provided on only one side of the resin film 3 (FIG. 1). And see FIG. 3).

The metal foil tape 6 is a tape composed of at least a metal foil 6a and an adhesive layer 6b provided on one surface of the metal foil 6a. The metal foil tape 6 may be provided with a base film (not shown) between the metal foil 6a and the adhesive layer 6b. The metal foil tape 6 is attached with the adhesive layer 6b side facing the resin film 3 side. In the examples of FIGS. 1 to 3, since the intervening layer 4 and the reinforcing material 5 are provided on the resin film 3, the metal foil tape 6 is provided on them. Such a metal foil tape 6 is provided as a conductive member for grounding connection for grounding connection. Therefore, it acts to keep the capacitance and the external inductance between the conductor 1 and the metal foil tape 6 uniform, and it is possible to prevent an impedance mismatch at this portion. Further, since the metal foil tape 6 has a shielding action, the reliability of the noise signal can be improved as a shielding layer.

Examples of the metal foil 6a include a metal foil having good conductivity such as a copper foil and an aluminum foil. The metal foil 6a may be tin-plated or the like for corrosion resistance and solderability. The thickness of the metal foil 6a is not particularly limited, but as an example, a tin-plated copper foil having a thickness of about 10 to 50 μm or the like can be used. The resistance value can be lowered by increasing the thickness of the metal foil 6a. As the adhesive layer 6b, a thermoplastic polyester-based adhesive layer, a thermoplastic polyimide-based adhesive layer, an epoxy-based adhesive layer, or the like can be preferably mentioned. The thickness of the adhesive layer 6b is also not particularly limited, but may be, for example, about 10 to 50 μm. Examples of the base film (not shown) arbitrarily provided include polyethylene terephthalate (PET) having a thickness of about 5 to 50 μm.

The thickness T of the metal foil tape 6 is, for example, in the range of 25 μm or more and 150 μm or less. Since the metal foil tape 6 covers all the conductors in the width direction X, the length W1 of the metal foil tape 6 in the width direction X is at least the length W2 from the end 1a to the end 1b of the juxtaposed conductors 1. It should be the same as or longer than that. That is, W2 ≦ W1 may be satisfied. Since all the conductors are covered with the metal foil tape 6 having a length W1 in the width direction X, the above-mentioned action can be obtained. Since the length W1 of the metal foil tape 6 is smaller than the length W3 of the resin film 3 and the length W4 of the protective film 8, the resin film 3 and the protective film 8 are longer than the metal foil tape 6 in the width direction X. It is sandwiched from above and below. As a result, since the metal foil tape 6 is not exposed at the width X end 32 of the flat cable, even if the width X end 32 comes into contact with other parts, problems such as a short circuit do not occur.

<Protective film>
As shown in FIGS. 1 to 3, the protective film 8 is arbitrarily provided on both sides of the flat cable as the outermost layer. The protective film 8, also called a jacket, protects the entire cable, reinforces its mechanical strength, and acts to withstand bending and the like. Examples of the protective film 8 include polyolefins such as polyvinyl chloride and polyethylene, and mixed resins of polyurethane resins and ethylene-vinyl acetate copolymer resins. Further, the protective film 8 may be a protective tape composed of an adhesive layer and a base film, and the tree protective tape is attached to both sides of the flat cable. The thickness of the protective film 8 is not particularly limited, but can be, for example, about 0.02 to 0.3 mm. The length W4 of the protective film 8 in the width direction X will be described later.

<Length of each component in the width direction>
In the width direction X, the length W1 of the metal foil tape, the length W2 from the end 1a to the end 1b of the conductors 1 arranged side by side, the length W3 of the resin film 3, and the length W4 of the protective film 8. Satisfies the relationship of W2 ≦ W1 <W4 ≦ W3. That is, since the length W1 of the metal foil tape 6 is covered with a length W2 or more from the end 1a to the end 1b of the conductor 1, the action and effect of the shield and the like can be ensured.

In the above case, when the thickness of the metal foil tape 6 is T, the relationship is preferably (W1 + 10T) ≦ W4. That is, since the length (W1 + 10T) obtained by adding 10T to the length W1 of the metal foil tape 6 is equal to or less than the length W4 of the protective film 8, 10T is the adhesion allowance (glue allowance), and one side is adhered. The protective film 8 and the resin film 3 are firmly bonded to each other when the substitute W5 is, for example, about 5 T. As described above, when the thickness T of the metal foil tape 6 is, for example, 25 to 150 μm, the protective film 8 has an adhesive allowance (glue allowance) having a length of 10 T (250 to 1500 μm), and both ends are even. If this is the case, the adhesive allowance W5 on one side has an adhesive allowance (glue allowance) of about 5 T (125 to 750 μm), so that the adhesive allowance W5 on one side is about 5 T and the protective film 8 and the resin film 3 are separated. It is firmly bonded. As a result, it is possible to prevent the metal foil tape 6 from being exposed due to the peeling of the protective film 8. The adhesive allowance W5 on one side is more preferably equal if both ends are equal, but it does not have to be even, and if it is at least 3 times or more, preferably 5 times or more of T, the protective film 8 and the resin film 3 are firmly bonded to each other. ..

Although the components of the flat cable 10 have been described above, the flat cable 10 according to the present invention is not limited to the above configuration as long as it includes the gist thereof. In the example of FIG. 3, the metal foil tape 6 is provided on one of the resin films 3 via the interposition layer 4, but the metal foil tape 6 is provided on both resin films 3 and 3 as shown in FIG. It may be provided on the top via any intervening layer 4. Even when the metal foil tapes 6 are provided on both sides of the flat cable 10, it is desirable that the flat cable 10 has the above-mentioned relationship of "length in the width direction of each component" and the form shown in FIG.

Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is not limited to the following examples.

[Example 1]
(Flat cable)
As the plurality of conductors 1, 51 copper flat wires having a thickness of 30 μm and a width of 0.3 mm were prepared. Next, a resin film 3 (thickness 25 μm) made of polyethylene terephthalate having an adhesive polyphenylene ether resin as an adhesive insulating layer 2 (thickness 35 μm) was prepared. In a state where 51 conductors were arranged side by side at a pitch of 0.5 mm, a resin film 3 having an adhesive insulating layer 2 on the conductor side was bonded from both sides thereof. Next, a metal leaf tape 6 having a thickness of 75 μm was attached onto the resin film 3 on one side via an interposition layer 4 having a thickness of 100 μm. In this metal foil tape 6, a tin-plated copper foil having a thickness of 40 μm including tin plating is formed through an adhesive layer (solvent-soluble polymer polyester resin) having a thickness of 35 μm and a base film having a thickness of 12 μm (illustrated). It is bonded to a polyethylene terephthalate film (not). The metal leaf tape 6 was attached to the polyethylene terephthalate film side with an adhesive. After that, the protective film 8 was provided. The protective film 8 was attached using a tape provided with an adhesive layer on the surface of the polyethylene terephthalate film.

(Length in width direction and adhesion allowance)
The length W2 of the width direction X from the end 1a to the end 1b of the juxtaposed conductors 1 is 25.3 mm, the length W1 of the metal foil tape 6 in the width direction X is 27.0 mm, and the resin film 3 The length W3 of the width direction X of the protective film 8 was 30.0 mm, and the length W4 of the protective film 8 in the width direction X was 29.5 mm. The thickness T of the metal foil tape 6 was 75 μm. The metal foil tape 6 is attached so as to cover the conductors 1 arranged side by side from the end 1a to the end 1b. The difference in length between the protective film 8 and the metal foil tape 6 was 2.5 mm, and the difference was 33 times the thickness T of the metal foil tape. At the end in the width direction after the protective film 8 was bonded, one was bonded with a bonding margin of 1.2 mm and the other was bonded with a bonding margin of 1.3 mm. It was confirmed that this bonding allowance was more than 5 times that of T, and that the bonding was good with a width that could not be easily peeled off.

[Examples 2 to 5, Comparative Example 1]
In Examples 2 to 5 and Comparative Example 1, the length W1 of the metal foil tape 6 in the width direction X was gradually increased as shown in Table 1, and the length W5 of the adhesive margin was gradually decreased. At that time, the stability of adhesion between the protective film 8 and the resin film 3 (presence or absence of peeling) was confirmed. The results are shown in Table 1. From the results in Table 1, it was found that when the length W5 of the adhesive margin is 5 times or more of T, it can be used without the problem of peeling. In addition, in α in Table 1, when the protective film 8 covers the metal foil tape 6, there is a gap portion that is not adhered at the end due to the thickness of the metal foil tape 6 and the thickness of the protective film 8. It is the length in the width direction X, and is estimated to be about 0.075 mm, which is the same as the thickness T of the metal foil tape 6 in this example and the comparative example.

1 Conductor 1a, 1b Conductor end 2 Adhesive insulating layer 3 Resin film 3c Width direction end of resin film 4 Intervening layer 5 Reinforcing plate 6 Metal foil tape 6a Metal foil 6b Adhesive layer 6c Width direction end of metal foil tape 8 Protective film 8c Width direction end of protective film 10 Flat cable 11 Longitudinal end 11a End 11b Resin film end in front of the end 31 Main body 32 Width end of main body X Width Y Longitudinal W1 Width direction length of metal foil tape W2 Width direction length from end to end of juxtaposed conductors W3 Width direction length of resin film W4 Width direction length of protective film W5 Width direction length of adhesive margin T Thickness of metal foil tape

Claims (5)

A plurality of conductors having a main body portion and terminal portions located on both sides in the longitudinal direction of the main body portion and arranged side by side in the width direction at predetermined intervals, two layers of adhesive insulating layers sandwiching the conductors, and the above-mentioned A flat having at least a resin film sandwiching two adhesive insulating layers, a metal foil tape provided on at least one of the resin films and covering all the conductors in the width direction, and a protective film covering the metal foil tape. It's a cable
In the width direction, the length of the metal foil tape is W1, the length from end to end of the juxtaposed conductors is W2, the length of the resin film is W3, and the length of the protective film. when was the W4, W2 ≦ W1 <W4 ≦ W3, meet the relationship, the thickness of the metal foil tape is T, the width of said protective film resin film and cover the metal foil tape is bonded A flat cable characterized in that W5 / T is 5.7 or more, where W5 is the length of one side of the bonding allowance at both ends in the direction. The flat cable according to claim 1, wherein the one-sided length of the bonding allowance is equal at both ends. The flat cable according to claim 1 or 2, wherein the thickness of the metal foil tape is within the range of 25 μm or more and 150 μm or less. The flat cable according to any one of claims 1 to 3, wherein an intervening layer is provided between the resin film and the metal foil tape. The flat cable according to any one of claims 1 to 4, wherein the metal foil tape is provided on both sides.

Images