EP0214276B1 - Cable plat a hautes performances - Google Patents

Cable plat a hautes performances Download PDF

Info

Publication number
EP0214276B1
EP0214276B1 EP86902117A EP86902117A EP0214276B1 EP 0214276 B1 EP0214276 B1 EP 0214276B1 EP 86902117 A EP86902117 A EP 86902117A EP 86902117 A EP86902117 A EP 86902117A EP 0214276 B1 EP0214276 B1 EP 0214276B1
Authority
EP
European Patent Office
Prior art keywords
cable
conductors
shield
insulating medium
connector
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.)
Expired
Application number
EP86902117A
Other languages
German (de)
English (en)
Other versions
EP0214276A1 (fr
Inventor
Glenn E. Bennett
Raymond Joseph Look
Frank P. Dola
Richard E. Thurman
Paul P. Siwinski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TE Connectivity Corp
Original Assignee
AMP Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US06/707,935 external-priority patent/US4680423A/en
Priority claimed from US06/716,417 external-priority patent/US4642480A/en
Priority claimed from US06/716,772 external-priority patent/US4628599A/en
Priority claimed from US06/716,711 external-priority patent/US4663098A/en
Priority claimed from US06/716,779 external-priority patent/US4640569A/en
Application filed by AMP Inc filed Critical AMP Inc
Publication of EP0214276A1 publication Critical patent/EP0214276A1/fr
Application granted granted Critical
Publication of EP0214276B1 publication Critical patent/EP0214276B1/fr
Expired legal-status Critical Current

Links

Images

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
    • H01B7/08—Flat or ribbon cables
    • H01B7/0823—Parallel wires, incorporated in a flat insulating profile
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/594—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures for shielded flat cable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/70—Coupling devices
    • H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
    • H01R12/771—Details
    • H01R12/775—Ground or shield arrangements

Definitions

  • This invention relates to a high performance multiconductor flat cable and more particularly to controlled impedance low loss, low attenuation cable employing a plurality of conductor pairs which can be used in undercarpet installations.
  • the method of manufacturing includes the steps of drawing conductor subassemblies formed of insulated wire pairs surrounded by an intermediate insulator through an extruder; forming conductive shields around the subassemblies prior to extrusion; and extruding an extra insulator around the shielded subassemblies.
  • Conventional multiconductor cables for transmitting high frequency electrical signals include both shielded twisted pair cables and coaxial cables. Such cables have their greatest utility in transmitting electrical signals between components of electrical systems. Such transmitted signals are normally in digital form although such transmitted signals may also be in analog form.
  • Shielded twisted pair cables utilize a pair of insulative conductive wires in a twisted pair configuration with a grounded, electrically conductive shield around each twisted wire pair.
  • the shield functions to reduce electromagnetic interference radiation, generally called EMI, which naturally emanates from the signal transmitting wires and which might otherwise adversely affect the performance of adjacent electronic devices.
  • EMI electromagnetic interference radiation
  • Such shield also functions to minimize cross talk, electrical interference between one pair of wires and an adjacent pair, which would tend to impair the fidelity of the signals being transmitted.
  • Shielded twisted pair cables can be used in a different transmission system where both wires are electrically powered and both constitute signal carrying wires. Information transmitted is a function of the sequential voltage differential between the two wires of the pair.
  • One application for a flat cable is an under the carpet wiring situation in which a flat, low profile cable is extended beneath the carpet for connection to, and coupling of, components of an electrical system such as a computer system or the like.
  • Shielded twisted pair cables do not have a low profile suited for use in undercarpet applications since twisted wires are continuously and sequentially located above, to one side, below, and to the other side of each other along the length of the cable.
  • the cable thickness periodically increases to a double wire thickness along the length of the cable.
  • This arrangement of signal thus precludes low profile cable configurations since low profile cable configurations are possible only in cables having their wires spaced parallel to each other in a single, usually horizontal, plane.
  • the configuration and orientation of wires in a shielded twisted pair cable also precludes mass stripping and termination since the positioning of any one wire with respect to another varies as a function of where the cable is cut along its length.
  • the present invention consists in a multiconductor flat cable comprising a plurality of conductors, each conductor being separately surrounded by a first insulating medium and in turn surrounded by a second insulating medium, the first insulating medium having a dielectric constant lower than the dielectric constant of the second insulating medium, characterised in that the conductors are arranged in a plurality of associated electrically balanced pairs for transmitting high frequency signals, the cable exhibiting high impedance, low cross talk electrical performance, the conductors being spaced side by side in the same plane and being separable at either end of the cable for individual termination; conductive shields surrounding the second insulating medium surrounding each conductor pair and forming a continuous EMI shield around each conductor pair; and a third insulating medium surrounding the plurality of conductor pairs, the conductive shields being encapsulated in the third insulating medium.
  • the invention enables the production of a controlled impedance, low attenuation, balanced flat cable having the performance characteristics of a shielded twisted pair cable.
  • the second insulating medium may provide dimensional stability to the conductors comprising a pair and precisely position the conductive shield relative to the conductors.
  • the third insulating medium may be extruded over the shields surrounding adjacent conductor pairs and holds the shields in place to prevent radiation.
  • the invention consists in a local area network cable assembly comprising a flat cable comprising a plurality of pairs of associated signal conductors each pair of conductors being surrounded by an EMI shield, a shielded electrical connector at one end of the cable comprising means for electrically interconnecting the signal conductors to electrical components, the local area network cable assembly being characterised in that at least one end of each EMI shield is separated into a plurality of strips, the assembly including a connector to cable adapter for interconnecting the EMI shield to the shielded connector, the adapter comprising a ferrule, at least one signal conductor extending through the ferrule, the EMI shield strips being deployed only on the exterior of the ferrule; and a body secured around the ferrule and engaging the EMI shield strips, the body being secured to the shielded connector.
  • the cable according to the invention may be produced by drawing at least one conductor subassembly through the die of an extrusion press.
  • Each subassembly contains a pair of insulated conductive wires which are spaced and parallel with respect to one another.
  • An electrically conductive shield is then formed around each subassembly prior to their movement through the die.
  • An insulator is then extruded therearound during their movement through the die.
  • the process preferably includes the steps of first forming conductor subassemblies and then drawing the two conductor subassemblies through the die of an extrusion press.
  • Each subassembly contains a pair of insulated conductive wires which are spaced and parallel with respect to one another.
  • An electrically conductive shield is then formed around each subassembly prior to their movement through the die.
  • the subassemblies are held spaced from each other and in an essentially horizontal plane with the wires of the subassemblies also in an essentially horizontal plane as they are drawn through the die.
  • An insulator is then extruded around the shields as they pass through the die.
  • Each subassembly is supported on a separate supply reel and the shield material is supported in flat foil form on additional reel means.
  • the finished cable is drawn through the die of the extrusion press by a power driven take-up reel.
  • Each shield is formed from a flat foil configuration, to an essentially cylindrical configuration surrounding the subassemblies, prior to passage through the die of the extrusion press.
  • each shield includes the steps of bending the flat foil into an essentially U-shaped configuration by pulling the flat foil through apertures in dies or forming blocks and then sequentially rolling the ends of the U-shaped foil into contact with each other to surround the subassembly by pulling the U-shaped foil through a series of sequential rollers.
  • the step of feeding a subassembly to the foil is performed before its passage to the final forming block.
  • the bending is accomplished by pulling the flat foil through a U-shaped die in a first forming block and then the U-shaped die in a second forming block.
  • the U-shaped foil supports a subassembly prior to movement into the sequential rollers with the curved portion of the U-shaped foil and subassembly located facing downwardly and with the ends of the U-shaped foil and a flat surface of the subassembly facing upwardly.
  • the sequential rollers include the first rollers to contact and bend one upstanding leg of the U-shaped foil into contact with the flat face of the subassembly and the second rollers then bend the second upstanding leg into contact with the first upstanding leg of the U-shaped foil to thereby completely surround the subassembly.
  • the subassembly and shield fed from the sequential rollers is rotated 90 degrees before feeding it to the die of the extruder.
  • the path of travel of the subassembly and foil is essentially a straight line from the forming blocks to beyond the extruder.
  • the foil Prior to the passage of the foil to the forming blocks, the foil is preferably coated with a lubricant.
  • Figure 1A is a cross-sectional view of a two-pair flat cable with high performance characteristics manufactured in accordance with the teachings of the present invention.
  • the multilayer shielded pair cable in accordance with the teachings of this invention provides a controlled, impedance, low attenuation balance multiconductor flat cable suitable for use in transmitting digital or other high frequency signals.
  • the cable will be described in terms a flat conductor cable having two separate pairs of associated wire conductors, four conductors in all. It should be understood, however, that some applications may require a cable having more than just two pairs of conductors.
  • This invention is consistent with the use of any number of pairs of conductors and can be employed with a single pair of conductors or with a large number of pairs. Indeed, this invention is intended for use in applications requiring three or more pairs of conductors or even one pair in a manner similar to the use of the two-pair cable.
  • the principal embodiment of this invention depicted herein is intended for use in installations in which the flat cable is to be installed along the floor of an office building and under the carpet to enable connections to be made with portions of a network arbitrarily distributed in an office building.
  • this high performance cable having conductors located within the same plane, is not limited to use in undercarpet installations. Indeed, constant orientation of the conductors in the same plane renders this cable quite suitable to applications in which it is desirable that the conductors be simultaneously mass terminated to the connector position at the end of the cable.
  • this cable is quite suitable for use as a preterminated cable assembly in which connectors may be assembled at each end of precise lengths of cable in a factory environment.
  • the cable is fabricated with a common symmetrical cross-sectional profile along its entire length.
  • weakened sections 30 and 32 By virtue of weakened sections 30 and 32 and inherent flexibility, it can rest on the floor in a flat condition regardless which side is placed on the floor.
  • FIG. 1 The cross-sectional configuration shown in Figure 1 demonstrates the relative positioning of four wire conductors 11, 12, 21 and 22 in a flat cable assembly 2.
  • Each of the conductors 11, 12, 21 and 22 employed in the preferred embodiment of this invention comprises a conventional round wire conductor.
  • Conductors 11 and 12 comprise one associated pair of conductors while conductors 21 and 22 comprise a similar pair of associated conductors.
  • each of the conductors 11, 12, 21 and 22 is positioned in the same plane, thus facilitating the low profile necessary for use in undercarpet installations, the two conductor pairs are nevertheless electrically balanced.
  • Both of the conductor pairs are embedded in an outer insulating body 4 which comprises the central longitudinally extending portion or region of the cable 2.
  • each of the wings 6 and 8 comprises an inclined surface to provide a smooth transition laterally of the axis of the cable, thus eliminating any sharp bump when the cable is positioned beneath a carpet.
  • the insulating ramps 6 and 8 are formed from the same material as the insulating material which forms insulating body in. Wings 6 and 8 are joined to body 4 along weakened longitudinally extending sections 30 and 32.
  • the insulating material forming the body 4 and the insulating material forming wings 6 and 8 comprises an extruded insulating material having generally the same composition.
  • a conventional polymer such as polyvinyl chloride, PVC, would be an insulation which comprises one material suitable for use in the jacket or body 4 and in the wings 6 and 8.
  • the surfaces or faces of the opposed central regions of the cable are parallel to each other.
  • a continuation of such parallelism extends to a limited degree into the wings of the cable.
  • This extending of the parallelism into the wings provides for an extended thicker, horizontal section of the cable between the tapered regions of the wings when the cable is placed on the floor beneath a carpet.
  • This design has been found to further distribute the forces from the carpet through the cable to the floor uniformally and reduce the external forces which would otherwise detrimentally act upon the wires and shield within the cable.
  • the transverse profile of the cable is low, and it is symmetrical about both its central horizontal plane and its central vertical plane so that it may be employed with either face up, reducing the chance for operator error during installation.
  • the opposed faces of the central region of the body are essentially flat and are as thin as possible consistent with known fabrication techniques while allowing for the high electrical performance of the cable. In the preferred embodiments of the invention the greatest thickness does not exceed 70 mils.
  • the width of the cable should be of such a dimension so that when employed under a carpet it will allow a smooth transition from the floor to the center of the cable and then thereacross. The presence of the cable should not be discernible.
  • a preferred dimension for the width of the cable has been found to be about 2.00 inches. Such a dimension will allow the above described smooth transition but will not enlarge the taper of the wings to the extent of being wasteful of material constituting their body.
  • Each shielded cable pair is separately embedded within the insulating body 4.
  • the conductors 21 and 22 form one pair 20 of associated conductors encapsulated within a separate insulating core 25 which is in turn embedded within the body 4 of the cable 2.
  • Each conductor 21 and 22 is however encircled by a first insulation 23 and 24 respectively which comprises a foam-type insulation having relatively low dielectric constant.
  • Foam-type insulation such as polypropylene or polyethylene each of which contain a large percentage of air trapped within the material comprise a suitable dielectric material for use around the conductors in areas of relatively high dielectric field.
  • foam covered conductors can then be embedded within an insulating material 25 which completely surrounds the foam insulation 23 and 24 in the immediate vicinity of the conductors.
  • the insulating material 25 need not have as low a dielectric constant as the foam insulation 23 and 24, since the insulating material 25 is located in areas of relatively low electric fields. The insulating material 25 thus has less effect on the cable impedance than the foam insulation 23 and 24.
  • the insulating material 25 must however be suitable for imparting dimensional stability to conductors 21 and 22. In fact, in this invention the dielectric material 25 holds the conductors 21 and 22 in a parallel configuration along precisely spaced center lines.
  • the insulating material forming the core 25 also comprises a material having greater strength when subjected to compressive forces than the foam-type insulation 23 and 24 surrounding conductors 21 and 22.
  • a material suitable for forming core 25 is a conventional polyvinyl chloride which can be extruded around the foam insulation 23 and 24 surrounding conductors 21 and 22. It is desirable that the foam-type insulation 23 and 24 do not become adhered to the extruded insulating material forming the core 25, since the conductors must be removed from the core 25 for conventional termination into a connector.
  • longitudinally extending notches 26, 27 are defined along the upper and lower surfaces of the core 25. These notches, which can be conveniently formed as part of the extrusion process, are located in areas of relatively low dielectric fields and define a weakened section of insulating core 25 to permit separation of conductors 21 and 22 for termination purposes.
  • EMI shield 28 can be positioned in partially encircling relationship to conductors 21 and 22 within insulating core 25.
  • the ends 28a and 28b of the EMI shield extend beyond the lateral edge of core 25 during fabrication of the cable.
  • Figure 12 shows that these ends 28a and 28b can then be folded into overlapping relationship along one end or edge of the core 25.
  • the one edge of core 25 comprises a planar edge extending transversely, and preferably perpendicular to the plane in which the conductors 21 and 22 are positioned.
  • This planar edge facilitates an assembly of the shield 28 in overlapping relationship along the edge of core 25. Furthermore, by providing the sharp corners of the upper and lower extent of this planar surface good contact is maintained between the overlapped portions 28a and 28b of the cable at these two points. Thus, gaps which can act as an antenna in the shielding are prevented. As shown in Figure 13, the overlapped ends 28a and 28b of the EMI shield 28 are secured in a tightly held configuration by the insulating material extruded around the EMI shield and comprising the insulating body 4. Thus the ends 28a and 28b would not be subject to movement upon flexure of the cable to create a gap or radiating antenna. In the preferred embodiment of this invention, an annealed metallic foil is employed as the EMI shields 18 and 28.
  • an annealed copper foil having a 2 mil thickness is suitable for use an as EMI shield in the preferred embodiment of this invention.
  • Figure 1 B shows an alternate embodiment of this invention in which the planar ends of the insulating core, where the EMI shield is overlapped and positioned on the exterior of the conductor pairs.
  • Figure 1A shows the two ends of the separate EMI shields positioned adjacent to each other within the body 4. Since the invention is suitable for use with more than two pairs of conductors, it is apparent from the relative positioning of the flat overlapping ends of the cable as a matter of choice. For example, if three pairs are employed, the flat ends of all three shields cannot be adjacent if all conductors are positioned within the same plane.
  • Cable manufactured in accordance with this invention has been constructed which achieves sufficiently high levels of performance to permit its use in applications of the type described herein.
  • the cable is rated at 300 volts D.C. or RMS at 0.5 amperes D.C. or RMS at an operating temperature of -40° to 60°C.
  • the conductor resistance is less than 45 ohms per 304 meters D.C. at approximately 20°C.
  • the cable has a characteristic impedance on the order of 150 ohms and a maximum propagation delay of 2.8 nanoseconds per foot.
  • the maximum attenuation is .72 D.B. per 100 feet at 1 MHz and 7.2 D.B. per 100 feet at 100 MHz.
  • the maximum rise time for an impulse of 250 pecoseconds would be 16 nanoseconds and a 1 percent maximum cross talk between adjacent conductors is also achieved.
  • FIGs 16 and 17 illustrate the ease in which the conductors may be presented for termination. Initially the wings 6 and 8 can be removed adjacent the ends. Weakened sections 30 and 32 facilitate the perforation of the ends of the cable since the wings can be removed by simply tearing along the weakened sections 30 and 32. The insulating material comprising the insulating body 4 can then be easily removed from the shielded cable pairs by means of a slitting tool as shown in Figures 15a and 15b.
  • conductors 21 and 22 are shown primarily for illustrative purposes since it will normally not be necessary to remove insulation 23 and 24 from the bare conductors 21 and 22. However, it may be desirable in certain installations to remove the insulation 23 and 24 before terminating conductors 21 and 22 and this invention is suitable for use in this manner.
  • the cylinders of insulation 23 and 24 for the conductors are preferably extruded around the conductors.
  • the extrusion is preferably polyethylene resin with a predetermined percentage of a foaming agent planted with the polyethylene to be heated and extruded. It is the foaming agent which forms the air within the extruded product when subjected to heat and pressure.
  • the materials, their compositions and proportions, the heat and speed of extrusion, the post extrusion quenching, etc. are selected so as to form the insulation around the wire to exact dimensional tolerances and as a closed cell foam with about 40 to 60 percent air by volume. It has been found that the maximum amount of air within the dielectric will improve the electrical performance of the system. However, excess air beyond the range as identified herein may degrade the dimensional stability of the integrity of the foam.
  • foam covered conductors may then be embedded within an insulating material 25 as by extrusion, which completely surrounds the foam insulation 23 and 24 in the immediate vicinity of the conductors.
  • the insulating material 25 need not have as low a dielectric constant as the foam insulation 23 and 24, since the insulating material 25 is located in areas of relatively lower electric fields.
  • the insulating material 25 must, however, be suitable for imparting dimensional stability and integrity to conductors 21 and 22 as well as to their surrounding insulation 23 and 24.
  • the dielectric material 25 holds the conductors 21 and 22 in a parallel configuration along precisely spaced surfaces, edges and center lines with respect to the cable and with respect to each other.
  • the insulating material forming the core 25 also comprises a material having greater strength when subjected to compressive forces than the foam-type insulation 23 and 24 surrounding the conductors 21 and 22.
  • a material suitable for forming core 25 is preferably a conventional flexible polyvinyl chloride, PVC, which can be extruded around the foam insulation 23 and 24 surrounding conductors 21 and 22. It is desirable that the foam-type insulation 23 and 24 not adhere to the extruded insulating material forming the core 25 to facilitate separation of the conductors from the core 25 for conventional termination into a connector.
  • notches 26 and 27 are defined along the upper and lower surfaces of the core 25. These notches, which can be conveniently formed as part of the extrusion process through the appropriate design of the die are located in areas of relatively low dielectric field and define a weakened section of insulating core 25 to permit separation of conductors 21 and 22 for termination purposes. Formed into the upper and lower surfaces of the body 4 are central notches 35 and 36 extending the length of the core along the centerline. Similar to the notches 26 and 27 in the core 25, central notches 35 and 36 constitute weakened sections in the insulating body 4 to permit an operator to separate, by hand, one conductor pair from another. These central notches are naturally formed during the cooling process following the extrusion since a greater quantity of shrinkable PVC is located in the body 4 between upper and lower notches as compared with the quantity of insulator immediately to either side thereof.
  • each pair of conductors is greatly enhanced by the use of EMI shields 18 and 28 encircling the cores 15 and 25 of the conductors within each conductor pair 10 and 20.
  • EMI shield 28 can be positioned in partially encircling relationship to conductors 21 and 22 within insulating core 25.
  • the ends 28A and 28B of EMI shield extend beyond the lateral edge of core 25 during fabrication of the cable.
  • FIG. 7 illustrates machinery capable of carrying out the method of fabricating or manufacturing the cable as disclosed herein.
  • the invention anticipates the utilization of separate supply reels 44 for supporting flat, electrically conductive strips 46, such as of copper, for the forming of the EMI shields.
  • Separate supply reels 48 are also provided, each being adapted to support a supply of the two conductor subassemblies 50.
  • Each subassembly is formed of two laterally spaced conductive wires surrounded separately by the first, or internal insulating material which is preferably a closed cell polyethylene foam.
  • the polyethylene foam may be extruded onto the wires in a conventional manner.
  • the insulating wires may then be fed in separated pairs through an extrusion die, also in an essentially conventional manner, to form the two conductor subassemblies shown on the supply reels of Figure 2 and within the EMI shield of Figure 1.
  • Figure 2 is an overview of the apparatus employed in carrying out the method of the present invention. It is adapted to bring together separate strips of copper from the two foil supply reels and the pair of two conductor subassemblies from their two supply reels.
  • the arrangement of components of the apparatus is such as to position the subassemblies and strips for proper orientation along their paths of movement for final extrusion of the able body material around the subassemblies and surrounding shields and for final take up to create the finished cable.
  • the significant functioning components of the fabrication system include the oiler 52 for lubricating the flat copper foil strips; the V-shaped die or former-block 54 for shaping the copper strips; the U-shaped die or former-block 56 for shaping the copper strips with a conductor subassembly 50 contained therein; the rolling mill station 58 for the final shaping of the copper strips into the EMI shields the orienting block 60 for the pre-extrusion positioning of the EMI shields and their surrounded subassemblies; the extrusion press 62 and the receiving station 64 including the power driven take up reel 66 for receiving the finished cable 68.
  • the pre-extrusion components of the apparatus are more readily seen in Figure 3 which shows these components enlarged as compared with Figure 2.
  • the copper foil strips are originally in a flat orientation as they rest and then are fed from the supply reels. Their shaping begins as they are fed through a set of forming-blocks.
  • the first, or primary, forming-block is provided with two V-shaped slits 72 through which the strip may pass and which will deform the foils into a V-shaped configurations corresponding to the shape of the slits in the first forming-block.
  • the V-shaped foil strips are next fed through a second, or secondary, U-shaped forming block 56 having two openings 74, aligned with the slits of the V-shaped forming block, of such size and shape so as to receive the V-shaped foil and deform it into a U-shaped configuration.
  • the U-shaped openings are sufficiently large so as to also receive the subassemblies which pass through the openings with the foil. It is immediately prior to the U-shaped forming-block that the supply of two conductor subassemblies 50 are brought into contact with the foil strips 46.
  • the flat portions of the subassemblies 76 preferably face upwardly as are the edges 78 of the foil.
  • the operation of the forming blocks has been found to be improved by lubricating the strips prior to their bending at the forming-blocks. This is achieved at the lubrication assembly.
  • the lubrication assembly includes an aperture 80 in a block 82.
  • the upper and lower surfaces of the aperture are provided with felt pads 84, closely spaced to contact the foil strips passing therebetween.
  • a hole 86 in the top of the block supports a bottle 88 with a supply of lubricant such as mineral oil.
  • the mineral oil of the bottle is in flow communication with the felt pads to continuously moisten the felt pads with the lubricating mineral oil. Moistening of the lower felt pad occurs through the contact between the upper and lower pads between the foil strips and beyond the edges of the foil strips.
  • the composite subassemblies of U-shaped foils are then fed into apertures 90 of the rolling mill assembly prior to passage to and through the extrusion press 62.
  • the rolling mill assembly includes the plurality, as for example five in number, of precisely machined rollers 92, 94, 96, 98 and 100, preferably fabricated of steel, and located in the path of travel of the composite subassemblies with foils. It is at this station that the edges of the foil are finally formed to constitute the EMI shield totally surrounding the subassemblies and to be surrounded and encased by the third or exterior insulator which forms the body of the cable.
  • Each roller of the rolling mill is mounted for free rotation on shafts 104.
  • the shafts are, in turn, supported by holes 106 in the side plates 108 of the station.
  • the side plates are supported on their bottom surfaces by a base plate 110.
  • Support is also provided frontwardly, centrally and rearwardly by cross brace plates or supports 112, 114 and 116 to add rigidity to the station for maintaining the rollers in precise orientations for accurately bending or shaping the EMI shield from the U-shaped copper foil to the final essentially cylindrical shape totally surrounding the subassembly.
  • Figures 4 through 11 are cross-sectional views of the roller station and foil taken along lines 4 - 4 through 11 - 11 of Figure 3. It should be appreciated and understood that similar but opposite operations are separately simultaneously performed on the adjacent copper strip.
  • Figure 4 illustrates a single copper foil strip in U-shaped configuration with a subassembly located therein passing through an opening 90 in the front support plate which is actually formed of an upper and lower section.
  • the foil and subassembly enter the roller station with their curved sections downwardly and with the legs of the U-shaped foil strip and flat face of the subassembly.
  • the hole is shaped and located to help position and align the subassembly and strip accurately through the rolling operation and to and through the extrusion press.
  • Figures 5 and 6 illustrate the rolling action of the two initial rollers 92 and 94 downwardly bending the first edge of the foil.
  • the bending of the strip to the horizontal position in contact with the flat side of the subassembly is completed by passage of the subassembly and strip through an aperture 120 in the central support block 114 as shown in Figure 7.
  • Figures 8 and 9 illustrate the two supplemental rollers 96 and 98 bending the second edge of a copper foil over the first edge of the foil to completely flatten the second edge over the first edge to create the EMI shield totally surrounding the subassembly.
  • the rollers are all machined with precise beveled or angled sections which contact the fed foil strip at a precise location to effect the bending of the foil strip as required.
  • the EMI shield Before exiting from the rolling station, the EMI shield passes through a hole 122 in the rearward support plate 116. See Figure 11. At this point an extra degree of compression is provided to the subassembly and to the EMI shield which are now prepared for being fed to and through the extrusion press.
  • the hole 122 by virtue of its precise size and location, assists in maintaining the subassembly and EMI shield on a straight line path to and through the extrusion press.
  • the two EMI shields with their surrounded subassemblies are passed through an opening 124 in an orienting block 60.
  • This arrangement is such as to locate the subassemblies and EMI shields with their flat faces in spaced relationship with such flat faces facing each other.
  • the insulated wires are thus in spaced parallel relationship in a common horizontal plane as are the subassemblies.
  • the distance between the rolling station and orienting block should be sufficiently long so as not to deform the EMI shield.
  • the extrusion press has a die with a profile of the finished cable as can be seen in Figure 1. The shape of the profile is determined by the shape of the die of the final extrusion die except for the central longitudinal depressions. These depressions are formed upon the cooling of the extruded material due to the larger mass of extruded material therebetween as compared with the mass of extruded material on the adjacent sides thereof.
  • the subassembly and foil strip be fed through the stations of the apparatus performing the inventive method disclosed herein in an essentially straight line path from at least the last forming-block to a location beyond the extrusion press. In this manner the foil will be stressed as little as possible during fabrication and its strength and integrity maintained.
  • the take up reel driven in the conventional manner, pulls or draws the final cable product in their in-line paths of movement through the fabrication machinery and also serves as a storage reel for the cable.
  • An inner segment of EMI shield with a subassembly segment will be found coiled on the interior of the take up reel since the pre-extrusion components of the process must be initially fed through the machinery to the take up reel to effect its pulling operation prior to and immediately following the activation of the extrusion press.
  • FIGS 18 - 21 show a local area network cable assembly consisting of cable 2, connectors 148 and a connector to cable adapter 144.
  • the adapter 144 includes a ferrule 146 to allow an operational electrical connection between the wires and EMI shield of a stripped cable end and a shielded connector 148 functionally equivalent to, and of essentially the same design as that disclosed in US-Patent 4 449 778.
  • Each shielded connector 148 has a plurality of signal connector terminals 108 adapted to establish an insulation displacement interconnection to the respective signal conductors 11, 12, 21, 22.
  • a connector EMI shield 100 surrounds the terminals and is adapted to be interconnected to the cable shields surrounding the conductors.
  • the adapter of the present invention includes a body 150 which is formed of two essentially identical halves or portions 152 and 154.
  • the halves are axially split and are provided on their mating surfaces with male projections 156 and associated female receptors 158, pins and apertures, to effect appropriate and accurate alignment of the halves when joined.
  • the halves are different only in that one half contains, at its front or outboard end 160, the male mating projections and, at its rear or inboard end 162, the female apertures.
  • the other segment has, at its outboard end, the female apertures and, at its inboard end, the male projections.
  • inboard is intended to mean that axial end of the adapter away from the connector or toward that end when viewed from the adapter.
  • outboard is intended to mean that end of the adapter closer to the connector or toward that end when viewed from the adapter.
  • the adapter also includes a ferrule 146 in the form of an essentially cylindrically shaped hollow member.
  • the open ends 164 and 166 of the ferrule, both inboard and outboard, are turned outwardly to form ribs 168. These ribs are thus located at the axial ends of the ferrule to provide rigidity to the ferrule as during handling, installation or use.
  • Both adapter body segments have undercut central cavities to form a recess 170 axially bounded by slots 172 and 174.
  • the recess and slots are of such size and position as to receive the ferrule which contains, internally therethrough, pairs of insulated wires and their second or intermediate covering. Externally thereof, the ferrule receives crossed pairs of conductive strips 176, extensions of the EMI shields, both above and below.
  • the exterior surface of the adapter is provided with threads 182 which are tapered to increase in diameter. Adjacent the greatest diameter threads, approximately mid span of the adapter is an abutment shoulder 184 next followed by an enlarged, nut-like surface 186 grippable by a wrench.
  • the abutment shoulder limits the extent that the nut 188 may be rotated along the threads toward the outboard end of the halves.
  • the nut-like surface constitutes an area where an operator may grip, normally mechanically with a wrench, the halves while gripping and rotating the nut along the threads, again normally mechanically with a second wrench.
  • a nut 188 is first axially slid down the free end of the cable.
  • the adapter halves are then mated with a section of the second insulator from adjacent the stripped end of the cable spanning the axial ends of the adapter. Axial movement of the cable within the adapter is precluded due to the frictional holding forces of the apertures acting upon the ends of the cable within the adapter and by the projections extending into the cable.
  • the threads of the adapter are, of course, inboard of the free ends of the wires with the wires and exposed insulators just beyond the outboard end of the adapter.
  • the nut is then screwed onto the adapter threads.
  • Pliers are normally utilized to fixedly hold the grippable portion 186 of the adapter while an operator rotates the nut with another pliers toward the abutment shoulder with sufficient force until the segments of the adapter are in tight mating contact.
  • a first crossed pair of conductive strips of the EMI shields Compressed between the ferrule and the recess of one half is a first crossed pair of conductive strips of the EMI shields. These conductive strips of the EMI shield are formed as the cable is stripped and prepared in the manner previously described. Compressed between the ferrule and the recess of the other half is a second crossed pair of conductive strips of the EMI shield. This relationship makes for an effective grounding of the EMI shield within the adapter.
  • the materials of the adapter halves and the ferrule must be sufficiently electrically conductive so as to ground the EMI shield when the apparatus is in use. Die cast zinc aluminum or the equivalent has been found suitable for the halves of the adapter body while copper has been found suitable for the ferrule.
  • the outboard end of the adapter is provided with inboard and outboard spaced coupling plates 190 and 192 which together constitute the mounting brace. These plates are secured at their bases to intermediate, outboardly extending support plates 194 and 196. These support plates extend from the outboard end of the halves and are located on opposite sides of the aperture 178 so that the wires may extend therepast for connection to the connector.
  • wires of the cable are in a vertical orientation as they pass through the adapter. This is necessitated due to the need of the wires to pass beyond the spaced plates. A horizontal orientation of the wires and cable would cause an interference between the support plates and their associated parts on the connector.
  • Coupling of the adapter to the connector is effected by sliding the spaced plates over spring urged, electrically grounded projections 100 extending from the base 102 of the connector EMI shield positioned within the connector space 148. Note the direction of the arrows which indicate the direction of movement of the adapter and connector with respect to each other.

Landscapes

  • Insulated Conductors (AREA)

Abstract

Un assemblage de câble pour réseaux locaux comprend un câble plat, un connecteur blindé (148) et un adaptateur câble-connecteur possédant un corps (150) et une bague (146). Le câble possède une pluralité de conducteurs de signaux (11, 12, 21, 22) positionnés dans un plan commun. Chaque conducteur est entouré d'un premier milieu isolant en mousse (13, 14, 23, 24) et les conducteurs isolés forment une paire reliée entourée d'un noyau (15, 25) composé d'un deuxième milieu isolant extrudé possédant une constante diélectrique supérieure. Des blindages contre les interférences électromagnétiques (EMI) (18, 28) entourent chaque noyau (5, 25) et sont à leur tour entourés par un corps isolant externe (4). Les blindages se composent d'une feuille et le corps extérieur (4) maintient les bords se chevauchant (18a, 18b, 28a, 28b) autour du noyau (15, 25). Les extrémités du blindage sont fendues axialement pour être connectées par l'adaptateur au connecteur blindé. Le câble (2) peut être utilisé dans des installations posées sous une moquette, est indiqué pour la transmission équilibrée de signaux à haute fréquence et présente une impédance élevée et une faible diaphonie.

Claims (10)

1. Câble plat (2) à conducteurs multiples comprenant plusieurs conducteurs (11, 12, 21, 22), chaque conducteur étant entouré séparément d'un premier milieu isolant (13, 14, 23, 24) qui est lui-même entouré d'un deuxième milieu isolant (15, 25) le premier milieu isolant (13, 14, 23, 24) ayant une constante diélectrique inférieure à la constante diélectrique du deuxième milieu isolant (15, 25), caractérisé en ce que les conducteurs (11, 12, 21, 22) sont agencés en plusieurs paires associées (11, 12 et 21, 22), équilibrées électriquement, pour transmettre des signaux à haute fréquence, le câble présentant des performances électriques à haute impédance, faible diaphonie, les conducteurs (11, 12, 21, 22) étant espacés latéralement dans le même plan et pouvant être séparés à chaque extrémité du câble (2) pour une terminaison individuelle; des blindages conducteurs (18, 28) entourant le deuxième milieu isolant (15, 25) entourant chaque paire de conducteurs et formant un blindage EMI continu autour de chaque paire de conducteurs; et un troisième milieu isolant (4) entourant le groupe de paires de conducteurs, les blindages conducteurs (15, 25) étant enrobés dans le troisième milieu isolant.
2. Câble selon la revendication 1, caractérisé en ce que le premier milieu isolant (13, 14, 23, 24) comprend une matière à l'état de mousse contenant de l'air pour diminuer la constante diélectrique, et les deuxième, (15, 25) et troisième (4) milieux isolants sont extrudés.
3. Câble selon la revendication 1, dans lequel chaque blindage conducteur (18, 28) entourant chaque paire de conducteurs associés comprend un blindage en feuille métallique dont les extrémités (18a, 18b et 28a, 28b) sont disposées en recouvrement.
4. Câble selon la revendication 3, dans lequel le troisième milieu isolant (4) est extrudé autour de chaque blindage en feuille métallique afin de retenir les extrémités (18a, 18b et 28a, 28b) du blindage en feuille métallique en recouvrement.
5. Câble selon la revendication 4, dans lequel chaque deuxième milieu isolant (15, 25) comporte un bord plan s'étendant transversalement au plan commun des conducteurs (11, 12, 21, 22), les extrémités (18a, 18b, 28a, 28b) de chaque blindage (18, 28) étant disposées dans des positions de recouvrement mutuel le long du bord plan transversal.
6. Assemblage d'un câble de réseau local comprenant un câble plat (2) comportant plusieurs paires de conducteurs de signaux associés (11, 12, 21, 22), chaque paire de conducteurs étant entourée d'un blindage EMI (18, 28), un connecteur électrique blindé (148) à une extrémité du câble comprenant des moyens pour interconnecter électriquement les conducteurs de signaux (11, 12, 21, 22) à des composants électriques, l'assemblage de câbles de réseau local étant caractérisé en ce qu'au moins une extrémité de chaque blindage EMI (18, 28) est divisée en plusieurs bandes (176) l'assemblage comprenant un adaptateur de connecteur à câble destiné à interconnecter le blindage EMI au connecteur blindé, l'adaptateur comprenant une virole (146) au moins un conducteur de signal s'étendant à travers la virole, les bandes de blindage EMI étant déployées uniquement sur l'extérieur de la virole; et un corps (150) fixé autour de la virole et en prise avec les bandes du blindage EMI, le corps étant fixé au connecteur blindé.
7. Assemblage selon la revendication 6, caractérisé en ce que le câble comprend des conducteurs isolés séparément (11, 12, 21, 22), un noyau isolant (15, 25) entourant chaque paire de conducteurs associés et un blindage EMI (18, 28) entourant chaque noyau isolant (15, 25).
8. Assemblage selon la revendication 7, dans lequel les bandes EMI (176) sont formées par refendage axial du blindage EMI (15, 25) à proximité immédiate d'au moins une extrémité.
9. Assemblage selon la revendication 6, dans lequel les bandes EMI (176) sont croisées sur l'extérieur de la virole (146).
10. Assemblage selon la revendication 6, dans lequel le corps (150) de l'adaptateur est formé d'une matière électriquement conductrice et le connecteur blindé (148) comprend un blindage EMI (100) de connecteur, le corps étant en contact conducteur avec le blindage EMI du connecteur.
EP86902117A 1985-03-04 1986-03-04 Cable plat a hautes performances Expired EP0214276B1 (fr)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
US06/707,935 US4680423A (en) 1985-03-04 1985-03-04 High performance flat cable
US06/716,417 US4642480A (en) 1985-03-27 1985-03-27 Low profile cable with high performance characteristics
US716711 1985-03-27
US06/716,772 US4628599A (en) 1985-03-27 1985-03-27 Method for stripping insulation
US716779 1985-03-27
US716417 1985-03-27
US06/716,711 US4663098A (en) 1985-03-27 1985-03-27 Method of manufacturing high performance flat cable
US06/716,779 US4640569A (en) 1985-03-27 1985-03-27 Adaptor for coupling a cable to a connector
US716772 1985-03-27
US707935 1996-09-10

Publications (2)

Publication Number Publication Date
EP0214276A1 EP0214276A1 (fr) 1987-03-18
EP0214276B1 true EP0214276B1 (fr) 1989-08-02

Family

ID=27542114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86902117A Expired EP0214276B1 (fr) 1985-03-04 1986-03-04 Cable plat a hautes performances

Country Status (3)

Country Link
EP (1) EP0214276B1 (fr)
DE (1) DE3664832D1 (fr)
WO (1) WO1986005311A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009014294U1 (de) 2009-10-22 2011-02-24 Woertz Ag Satz zur Herstellung einer elektrischen Installation

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777325A (en) * 1987-06-09 1988-10-11 Amp Incorporated Low profile cables for twisted pairs
JPH0197309A (ja) * 1987-10-09 1989-04-14 Junkosha Co Ltd フラットケーブル
US5586911A (en) * 1992-09-08 1996-12-24 The Whitaker Corporation Shielding data connector
AU668962B2 (en) * 1992-09-08 1996-05-23 Whitaker Corporation, The Shielded data connector
FR2698477B1 (fr) * 1992-11-23 1994-12-23 Filotex Sa Câble de transmission de signaux haute fréquence.
US5399813A (en) * 1993-06-24 1995-03-21 The Whitaker Corporation Category 5 telecommunication cable
CA2311802A1 (fr) * 1997-12-05 1999-06-17 Lk A/S Procede de reduction d'un couplage de signaux haute frequence entre des paires de conducteurs dans un connecteur et connecteur de transfert de signaux differentiels
CN1213637C (zh) * 1999-11-16 2005-08-03 魁北克能源输送新技术中心 在电弧炉内便于再触发电弧的设备和方法
US6504379B1 (en) * 2000-11-16 2003-01-07 Fluke Networks, Inc. Cable assembly

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3219752A (en) * 1965-02-17 1965-11-23 Columbia Wire And Supply Compa High frequency electrical lead-in cable
US4308421A (en) * 1978-01-18 1981-12-29 Virginia Plastics Company EMF Controlled multi-conductor cable
US4488125A (en) * 1982-07-06 1984-12-11 Brand-Rex Company Coaxial cable structures and methods for manufacturing the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009014294U1 (de) 2009-10-22 2011-02-24 Woertz Ag Satz zur Herstellung einer elektrischen Installation
EP2315217A1 (fr) 2009-10-22 2011-04-27 Woertz AG Ensemble pour la fabrication d'une installation électrique

Also Published As

Publication number Publication date
EP0214276A1 (fr) 1987-03-18
DE3664832D1 (en) 1989-09-07
WO1986005311A1 (fr) 1986-09-12

Similar Documents

Publication Publication Date Title
US4680423A (en) High performance flat cable
EP0103430B1 (fr) Câble électrique blindé
US5107076A (en) Easy strip composite dielectric coaxial signal cable
US4973370A (en) Method of terminating braided electrical cable
US5952615A (en) Multiple pair cable with individually shielded pairs that is easy to connect
EP2685467B1 (fr) Câble électrique blindé
CA1147822A (fr) Cable blinde plat
US4490574A (en) Electrical cable
US4642480A (en) Low profile cable with high performance characteristics
US4640569A (en) Adaptor for coupling a cable to a connector
CA1123489A (fr) Conducteur electrique a contact incorpore, et methode de fabrication connexe
US4738027A (en) Apparatus for stripping insulation from electrical cable
WO1994009498A1 (fr) Cable electrique blinde
EP0214276B1 (fr) Cable plat a hautes performances
US4663098A (en) Method of manufacturing high performance flat cable
US4626298A (en) Method of making flat multiple conductor cable
US6689958B1 (en) Controlled impedance extruded flat ribbon cable
WO1992001301A1 (fr) Cable-ruban a propagation a grande vitesse
US4644099A (en) Undercarpet cable
CA1252162A (fr) Cable en nappe pour raccordement multiborne
US4808773A (en) Low impedance cable
CA2051505C (fr) Cable electrique a grande impedance et methode de formage
EP0123417A2 (fr) Câble-ruban électrique sans entailles
EP3246925A1 (fr) Ligne de transmission de données à paire équilibrée
WO1984004428A2 (fr) Cables coaxiaux et accouplements pour de tels cables

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19861028

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR IT NL

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SIWINSKI, PAUL, P.

Inventor name: THURMAN, RICHARD, E.

Inventor name: DOLA, FRANK, P.

Inventor name: LOOK, RAYMOND, JOSEPH

Inventor name: BENNETT, GLENN, E.

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SIWINSKI, PAUL, P.

Inventor name: THURMAN, RICHARD, E.

Inventor name: DOLA, FRANK, P.

Inventor name: LOOK, RAYMOND, JOSEPH

Inventor name: BENNETT, GLENN, E.

17Q First examination report despatched

Effective date: 19880810

ITF It: translation for a ep patent filed

Owner name: GUZZI E RAVIZZA S.R.L.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR IT NL

REF Corresponds to:

Ref document number: 3664832

Country of ref document: DE

Date of ref document: 19890907

RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: AMP INCORPORATED (A NEW JERSEY CORPORATION)

NLT2 Nl: modifications (of names), taken from the european patent patent bulletin

Owner name: AMP INCORPORATED (A NEW JERSEY CORPORATION) TE HAR

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19951231

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19971001

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19971001

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19990302

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990330

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050304