EP0645780A2 - Flat multi-conductor wire - Google Patents
Flat multi-conductor wire Download PDFInfo
- Publication number
- EP0645780A2 EP0645780A2 EP94114976A EP94114976A EP0645780A2 EP 0645780 A2 EP0645780 A2 EP 0645780A2 EP 94114976 A EP94114976 A EP 94114976A EP 94114976 A EP94114976 A EP 94114976A EP 0645780 A2 EP0645780 A2 EP 0645780A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- flat
- conductor
- wire
- conductor wire
- flat multi
- 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.)
- Withdrawn
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Classifications
-
- 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
- H01B7/0009—Details relating to the conductive cores
- H01B7/0018—Strip or foil conductors
-
- 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
Definitions
- the present invention relates to flat multi-conductor wires for use in wiring of office automation equipments, vehicle-mounted electronics and the like.
- Figs. 6A and 6B illustrate a flat multi-conductor wire known generally as a FPC (flexible printed wiring board) and a FFC (flat flexible wiring board), which comprises a plurality of elongated rectangular conductors 1 in the form of a thin plate or a foil arranged in predetermined spaced relation, and tapes 2a, 2b bonded to top and bottom surfaces of the rectangular conductors 1 in a sandwiched manner throughout the length thereof.
- the tape 2a on the top surface is removed at opposite ends to expose the rectangular conductors 1.
- the exposed portions of the rectangular conductors 1 are forced into a connector not shown to contact an internal terminal of the connector for electrical connection thereto.
- the flat multi-conductor wire shown in Figs. 7A, 7B is disclosed in Japanese Patent Application Laid-Open No. 3-236112 (1991) proposed by the applicant of the present invention which comprises a plurality of round wires 7 juxtaposed in planar, predetermined spaced relation and each including a round conductor 5 and an insulative coating 6 thereon.
- the coatings 6 are peeled off at opposite ends of the round wires 7 to expose the round conductors 5 to form contact portions 8.
- a fixing tape 9 provided on the back of the contact portions 8 adheres to the exposed round conductors 5 and the coatings 6 adjacent the contact portions 8.
- a coupling tape 10 provided on the front of the coatings 6 adjacent the contact portions 8 adheres to the coatings 6.
- the flat multi-conductor wire such as the FPC, FFC shown in Figs. 6A and 6B
- the conductors 1 are difficult to bend when the exposed portions of the conductors 1 at their one end are inserted into the connector.
- the flat multi-conductor wire of Fig. 6 is less flexible in the lateral directions, resulting in difficulty in two-dimensional flexural wiring.
- the use of the round conductors 5 causes an increased thickness of the whole wire and difficulty in wiring in a small space, as compared with the flat multi-conductor wire of Figs. 6A and 6B employing the rectangular conductors 1.
- the flat multi-conductor wire of Figs. 7A and 7B is less flexible because of its round shape if the conductors have the same cross sectional area.
- the whole round conductors 5 are coated with tin in consideration for time and labor to coat only the exposed portions of the round conductors 5 with tin, and the tin is melted by high temperature treatment.
- the tin coating process of the conductors 5 takes time and labor, and the subsequent high temperature treatment results in oxidation of fabrication jigs.
- a flat multi-conductor wire comprises: a flat wire group including a plurality of flat wires arranged in planar juxtaposition and each having a rectangular conductor and a coating portion made of an insulative material for covering an outer peripheral surface of the rectangular conductor; a contact portion formed such that the coating portions of the flat wires are removed at an end of the flat wire group to expose the rectangular conductors; a conductor coupling tape bonded to the rectangular conductors in the contact portion and the coating portions adjacent the contact portion on the back of the flat wire group; and a coating coupling tape bonded to the coating portions adjacent the contact portion on the front of the flat wire group.
- the flat multi-conductor wire of the present invention which includes the plurality of juxtaposed flat wires each having the coated rectangular conductor is thinner and more flexible than the prior art flat multi-conductor wire including the round conductors, thereby permitting small-space wiring.
- the flat multi-conductor wire of the present invention in which only an adhesive is required to bond the conductor coupling tape to the rectangular conductors in the contact portion because of the rectangular shape of the conductors, requires no high temperature treatment of the contact portion at the end.
- the flat multi-conductor wire of the present invention is adapted such that the rectangular conductors are loose in portions other than the contact portion at the end, thereby to allow two-dimensional flexural wiring.
- the flat multi-conductor wire according to the present invention is permitted for use in small-space wiring and two-dimensional flexural wiring and is very effective in wiring of office automation equipments and vehicle-mounted electronics.
- Fig. 1 is a plan view of a preferred embodiment according to the present invention.
- Fig. 2 is a side view in cross section taken along the line X-X' of Fig. 1.
- Fig. 3 is a fragmentary enlarged view of Fig. 2.
- Fig. 4 is a fragmentary enlarged side view of the preferred embodiment of Fig. 1.
- Fig. 5 is a perspective view of portions of Fig. 4.
- a plurality of flat wires 23 are juxtaposed in planar, predetermined spaced relation to form a flat wire group 23A.
- Each of the flat wires 23 comprises a rectangular conductor 21 of a copper foil or a tinned copper foil, and a coating portion 22 made of an insulative material such as polyvinyl chloride (PVC) or polyethylene (PE) by extrusion and formed on the rectangular conductor 21.
- PVC polyvinyl chloride
- PE polyethylene
- the thickness ta of the rectangular conductors 21 is 0.035 to 0.1 mm, and the width w thereof is 0.3 to 1.0 mm.
- the thickness tb of the coating portions 22 is preferably 0.1 to 0.3 mm.
- the wire-to-wire pitch that is the center-to-center distance of the rectangular conductors 21 of the adjacent flat wires 23 in the flat wire group 23A is preferably set to 0.5 mm, 0.8 mm, 1.0 mm, or 1.25 mm.
- the coating portions 22 at right and left ends of the flat wires 23 in the flat wire group 23A are peeled off to expose the rectangular conductors 21 to form contact portions 25.
- Conductor coupling tapes 26 made of an insulative material such as polyethylene terephthalate (PET), PVC, polyimide (PI) are provided on the back (bottom surface) of the right and left contact portions 25, respectively, and are bonded to the exposed rectangular conductors 21 and the coating portions 22 adjacent the contact portions 25 with an adhesive to hold the rectangular conductors 21 coupled together.
- the adhesives used herein may be well-known thermoplastic adhesives and preferably those melted at a relatively low temperature of about 200 °C.
- Coating coupling tapes 27 made of an insulative material such as PET, PVC PI are provided on the front (top surface) adjacent both the contact portions 25 in the same manner as the conductor coupling tapes 26.
- the coating coupling tapes 27 are bonded to the coating portions 22 adjacent the contact portions 25 with the above-mentioned thermoplastic adhesive.
- the ends of the flat wires 23 are held between the coupling tapes 26 and 27, and the flat wires 23 are coupled together at opposite ends thereof by the adhesive force of the adhesive, with the spacing between the flat wires 23 held at a predetermined value. Intermediate portions of the flat wires 23 are held in an uncoupled, loose condition.
- Arranging the plurality of flat wires 23 having the rectangular conductors 21 in planar, predetermined spaced relation to form the flat wire group 23A and coupling the flat wires 23 together in the contact portions 25 at opposite ends thereof with the coupling tapes 26, 27, provides the flat multi-conductor wire which is thinner and more flexible than the prior art flat multi-conductor wire of Fig. 7 having the round conductors (Japanese Patent Application Laid-Open No. 3-236112) and which is permitted for use in small-space wiring.
- the rectangular shape of the conductors 21 provides a sufficient adherence between the conductor coupling tapes 26 and the rectangular conductors 21 in the contact portions 25 with the adhesive, thereby eliminating the need for tin coating and high temperature treatment which are executed on the round conductors.
- the treatment of the contact portions 25 is significantly facilitated.
- the flat multi-conductor wire of this preferred embodiment includes the flat wires 23 which are loose between the contact portions 25 although similarly employing the rectangular conductors, thereby allowing two-dimensional flexural wiring. Since the flat multi-conductor wire of this preferred embodiment is substantially similar in schematic construction of the contact portions 25 to the FPC and FFC, the existing connector used for the FPC and FFC may be applied to the contact portions 25. There is no need to separately develop and fabricate a connector of special construction.
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- Insulated Conductors (AREA)
Abstract
Description
- The present invention relates to flat multi-conductor wires for use in wiring of office automation equipments, vehicle-mounted electronics and the like.
- Conventionally, this type of flat multi-conductor wire includes those shown in Figs. 6A, 6B, 7A, 7B, for example. Figs. 6A and 6B illustrate a flat multi-conductor wire known generally as a FPC (flexible printed wiring board) and a FFC (flat flexible wiring board), which comprises a plurality of elongated
rectangular conductors 1 in the form of a thin plate or a foil arranged in predetermined spaced relation, andtapes rectangular conductors 1 in a sandwiched manner throughout the length thereof. Thetape 2a on the top surface is removed at opposite ends to expose therectangular conductors 1. The exposed portions of therectangular conductors 1 are forced into a connector not shown to contact an internal terminal of the connector for electrical connection thereto. - The flat multi-conductor wire shown in Figs. 7A, 7B is disclosed in Japanese Patent Application Laid-Open No. 3-236112 (1991) proposed by the applicant of the present invention which comprises a plurality of
round wires 7 juxtaposed in planar, predetermined spaced relation and each including around conductor 5 and aninsulative coating 6 thereon. Thecoatings 6 are peeled off at opposite ends of theround wires 7 to expose theround conductors 5 to formcontact portions 8. A fixing tape 9 provided on the back of thecontact portions 8 adheres to the exposedround conductors 5 and thecoatings 6 adjacent thecontact portions 8. Acoupling tape 10 provided on the front of thecoatings 6 adjacent thecontact portions 8 adheres to thecoatings 6. - In the structure of Figs. 7A and 7B, only an adhesive does not provide sufficient adherence between the
conductors 5 and the fixing tape 9 because of the round shape of theconductors 5. It is, hence, a common practice to coat theentire round conductors 5 with tin which is in turn melted at a high temperature of about 350 °C to bond the fixing tape 9 to theround conductors 5 in thecontact portions 8 by penetration of tin into the fixing tape 9. - In the flat multi-conductor wire such as the FPC, FFC shown in Figs. 6A and 6B, however, since the rectangular configuration of the conductors themselves provides a high flexural rigidity in the lateral directions, the
conductors 1 are difficult to bend when the exposed portions of theconductors 1 at their one end are inserted into the connector. On the other hand, since all of therectangular conductors 1 are sandwiched between thetapes - In the flat multi-conductor wire of Figs. 7A and 7B, the use of the
round conductors 5 causes an increased thickness of the whole wire and difficulty in wiring in a small space, as compared with the flat multi-conductor wire of Figs. 6A and 6B employing therectangular conductors 1. The flat multi-conductor wire of Figs. 7A and 7B is less flexible because of its round shape if the conductors have the same cross sectional area. - Further, in the wire of Figs. 7A and 7B, to achieve a sufficient adherence between the
round conductors 5 in thecontact portions 8 and the fixing tape 9, thewhole round conductors 5 are coated with tin in consideration for time and labor to coat only the exposed portions of theround conductors 5 with tin, and the tin is melted by high temperature treatment. The tin coating process of theconductors 5 takes time and labor, and the subsequent high temperature treatment results in oxidation of fabrication jigs. - According to the present invention, a flat multi-conductor wire comprises: a flat wire group including a plurality of flat wires arranged in planar juxtaposition and each having a rectangular conductor and a coating portion made of an insulative material for covering an outer peripheral surface of the rectangular conductor; a contact portion formed such that the coating portions of the flat wires are removed at an end of the flat wire group to expose the rectangular conductors; a conductor coupling tape bonded to the rectangular conductors in the contact portion and the coating portions adjacent the contact portion on the back of the flat wire group; and a coating coupling tape bonded to the coating portions adjacent the contact portion on the front of the flat wire group.
- The flat multi-conductor wire of the present invention which includes the plurality of juxtaposed flat wires each having the coated rectangular conductor is thinner and more flexible than the prior art flat multi-conductor wire including the round conductors, thereby permitting small-space wiring. The flat multi-conductor wire of the present invention in which only an adhesive is required to bond the conductor coupling tape to the rectangular conductors in the contact portion because of the rectangular shape of the conductors, requires no high temperature treatment of the contact portion at the end.
- As compared with the FPC and FFC employing the rectangular conductors similarly, the flat multi-conductor wire of the present invention is adapted such that the rectangular conductors are loose in portions other than the contact portion at the end, thereby to allow two-dimensional flexural wiring.
- The flat multi-conductor wire according to the present invention is permitted for use in small-space wiring and two-dimensional flexural wiring and is very effective in wiring of office automation equipments and vehicle-mounted electronics.
- It is an object of the present invention to provide a thin and flexible flat multi-conductor wire which requires no high temperature treatment of contact portions at ends thereof and which is permitted for use in small-space wiring and two-dimensional flexural wiring.
- These and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
-
- Fig. 1 is a plan view of a preferred embodiment according to the present invention;
- Fig. 2 is a side view in cross section taken along the line X-X' of Fig. 1;
- Fig. 3 is a fragmentary enlarged view of Fig. 2;
- Fig. 4 is a fragmentary enlarged side view of the preferred embodiment of Fig. 1;
- Fig. 5 is a perspective view of portions of Fig. 4;
- Figs. 6A and 6B illustrate a prior art flat multi-conductor wire; and
- Figs. 7A and 7B illustrate another prior art flat multi-conductor wire.
- Fig. 1 is a plan view of a preferred embodiment according to the present invention. Fig. 2 is a side view in cross section taken along the line X-X' of Fig. 1. Fig. 3 is a fragmentary enlarged view of Fig. 2. Fig. 4 is a fragmentary enlarged side view of the preferred embodiment of Fig. 1. Fig. 5 is a perspective view of portions of Fig. 4.
- Referring to Figs. 1 to 5, a plurality of
flat wires 23 are juxtaposed in planar, predetermined spaced relation to form aflat wire group 23A. Each of theflat wires 23 comprises arectangular conductor 21 of a copper foil or a tinned copper foil, and acoating portion 22 made of an insulative material such as polyvinyl chloride (PVC) or polyethylene (PE) by extrusion and formed on therectangular conductor 21. - Preferably, the thickness ta of the
rectangular conductors 21 is 0.035 to 0.1 mm, and the width w thereof is 0.3 to 1.0 mm. The thickness tb of thecoating portions 22 is preferably 0.1 to 0.3 mm. - The wire-to-wire pitch that is the center-to-center distance of the
rectangular conductors 21 of the adjacentflat wires 23 in theflat wire group 23A is preferably set to 0.5 mm, 0.8 mm, 1.0 mm, or 1.25 mm. - As shown in Figs. 1, 4 and 5, the
coating portions 22 at right and left ends of theflat wires 23 in theflat wire group 23A are peeled off to expose therectangular conductors 21 to formcontact portions 25.Conductor coupling tapes 26 made of an insulative material such as polyethylene terephthalate (PET), PVC, polyimide (PI) are provided on the back (bottom surface) of the right andleft contact portions 25, respectively, and are bonded to the exposedrectangular conductors 21 and thecoating portions 22 adjacent thecontact portions 25 with an adhesive to hold therectangular conductors 21 coupled together. - The adhesives used herein may be well-known thermoplastic adhesives and preferably those melted at a relatively low temperature of about 200 °C.
-
Coating coupling tapes 27 made of an insulative material such as PET, PVC PI are provided on the front (top surface) adjacent both thecontact portions 25 in the same manner as theconductor coupling tapes 26. Thecoating coupling tapes 27 are bonded to thecoating portions 22 adjacent thecontact portions 25 with the above-mentioned thermoplastic adhesive. The ends of theflat wires 23 are held between thecoupling tapes flat wires 23 are coupled together at opposite ends thereof by the adhesive force of the adhesive, with the spacing between theflat wires 23 held at a predetermined value. Intermediate portions of theflat wires 23 are held in an uncoupled, loose condition. - Arranging the plurality of
flat wires 23 having therectangular conductors 21 in planar, predetermined spaced relation to form theflat wire group 23A and coupling theflat wires 23 together in thecontact portions 25 at opposite ends thereof with thecoupling tapes conductors 21 provides a sufficient adherence between theconductor coupling tapes 26 and therectangular conductors 21 in thecontact portions 25 with the adhesive, thereby eliminating the need for tin coating and high temperature treatment which are executed on the round conductors. The treatment of thecontact portions 25 is significantly facilitated. - Compared with the FPC and FFC of Figs. 6A and 6B, the flat multi-conductor wire of this preferred embodiment includes the
flat wires 23 which are loose between thecontact portions 25 although similarly employing the rectangular conductors, thereby allowing two-dimensional flexural wiring. Since the flat multi-conductor wire of this preferred embodiment is substantially similar in schematic construction of thecontact portions 25 to the FPC and FFC, the existing connector used for the FPC and FFC may be applied to thecontact portions 25. There is no need to separately develop and fabricate a connector of special construction. - Comparison is made between the connector used for the FPC and FFC and the connector for the flat multi-conductor wire having the round conductors. The latter employing the round conductors is necessarily thicker than the former for the FPC and FFC having the rectangular conductors. Therefore, a thinner connector is applied to the flat multi-conductor wire of this preferred embodiment, permitting small-space wiring more effectively.
- While the invention has been shown and described in detail, the foregoing description is in all aspects illustrative and not restrictive. It is therefore understood that numerous modifications and variations can be devised without departing from the scope of the invention.
Claims (7)
- A flat multi-conductor wire comprising:
a flat wire group including a plurality of flat wires arranged in planar juxtaposition and each having a rectangular conductor and a coating portion made of an insulative material for covering an outer peripheral surface of said rectangular conductor;
a contact portion formed such that said coating portions of said flat wires are removed at an end of said flat wire group to expose said rectangular conductors;
a conductor coupling tape bonded to said rectangular conductors in said contact portion and said coating portions adjacent said contact portion on the back of said flat wire group; and
a coating coupling tape bonded to said coating portions adjacent said contact portion on the front of said flat wire group. - The flat multi-conductor wire of claim 1, wherein
said rectangular conductors have a thickness ranging from 0.035 mm to 0.1 mm and a width ranging from 0.3 mm to 1.0 mm. - The flat multi-conductor wire of claim 1, wherein
said coating portions have a thickness ranging from 0.1 mm to 0. 3 mm. - The flat multi-conductor wire of claim 2, wherein
said coating portions have a thickness ranging from 0.1 mm to 0. 3 mm. - The flat multi-conductor wire of claim 1, wherein
a wire-to-wire pitch of said flat wires adjacent to each other is 0.5 mm, 0.8 mm, 1.0 mm, or 1.25 mm. - The flat multi-conductor wire of claim 1, wherein
said conductor coupling tape and said coating coupling tape are made of an insulative material. - The flat multi-conductor wire of claim 6, wherein
said insulative material of said conductor coupling tape and said coating coupling tape includes polyethylene terephthalate, polyvinyl chloride, and polyimide.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26165793A JPH0794033A (en) | 1993-09-24 | 1993-09-24 | Flat multiconductor electric wire |
JP261657/93 | 1993-09-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0645780A2 true EP0645780A2 (en) | 1995-03-29 |
EP0645780A3 EP0645780A3 (en) | 1995-05-24 |
Family
ID=17364958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94114976A Withdrawn EP0645780A3 (en) | 1993-09-24 | 1994-09-22 | Flat multi-conductor wire. |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0645780A3 (en) |
JP (1) | JPH0794033A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002080198A1 (en) * | 2001-03-30 | 2002-10-10 | The Ludlow Company Lp | Flexible interconnect cable with ribbonized ends |
WO2003052772A1 (en) * | 2001-12-18 | 2003-06-26 | The Ludlow Company Lp | Flexible interconnect cable with ribbonized ends and method of manufacturing |
US6651318B2 (en) | 2001-03-30 | 2003-11-25 | Ludlow Company Lp | Method of manufacturing flexible interconnect cable |
CN109888585A (en) * | 2019-02-22 | 2019-06-14 | 今皓光电(昆山)有限公司 | A kind of flat quick charge line and its processing technology |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4591166B2 (en) * | 2005-04-13 | 2010-12-01 | 住友電気工業株式会社 | Flat cable and manufacturing method thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2356247A1 (en) * | 1976-06-21 | 1978-01-20 | Advanced Circuit Tech | FLAT CABLE FOR FLYING CONNECTIONS |
GB2128503A (en) * | 1982-10-12 | 1984-05-02 | Westinghouse Electric Corp | Improvements in or relating to insulated conductors |
US5147510A (en) * | 1990-02-09 | 1992-09-15 | Sumitomo Wiring Systems, Ltd. | Flat multicore wire and method of forming the same wire |
-
1993
- 1993-09-24 JP JP26165793A patent/JPH0794033A/en active Pending
-
1994
- 1994-09-22 EP EP94114976A patent/EP0645780A3/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2356247A1 (en) * | 1976-06-21 | 1978-01-20 | Advanced Circuit Tech | FLAT CABLE FOR FLYING CONNECTIONS |
GB2128503A (en) * | 1982-10-12 | 1984-05-02 | Westinghouse Electric Corp | Improvements in or relating to insulated conductors |
US5147510A (en) * | 1990-02-09 | 1992-09-15 | Sumitomo Wiring Systems, Ltd. | Flat multicore wire and method of forming the same wire |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002080198A1 (en) * | 2001-03-30 | 2002-10-10 | The Ludlow Company Lp | Flexible interconnect cable with ribbonized ends |
US6651318B2 (en) | 2001-03-30 | 2003-11-25 | Ludlow Company Lp | Method of manufacturing flexible interconnect cable |
US8013252B2 (en) | 2001-03-30 | 2011-09-06 | Larry Daane | Flexible interconnect cable with ribbonized ends |
WO2003052772A1 (en) * | 2001-12-18 | 2003-06-26 | The Ludlow Company Lp | Flexible interconnect cable with ribbonized ends and method of manufacturing |
CN109888585A (en) * | 2019-02-22 | 2019-06-14 | 今皓光电(昆山)有限公司 | A kind of flat quick charge line and its processing technology |
Also Published As
Publication number | Publication date |
---|---|
EP0645780A3 (en) | 1995-05-24 |
JPH0794033A (en) | 1995-04-07 |
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