EP0034232A2 - Verfahren zum Herstellen von Schleifringen und nach diesem Verfahren hergestellte Schleifringe - Google Patents

Verfahren zum Herstellen von Schleifringen und nach diesem Verfahren hergestellte Schleifringe Download PDF

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Publication number
EP0034232A2
EP0034232A2 EP80301739A EP80301739A EP0034232A2 EP 0034232 A2 EP0034232 A2 EP 0034232A2 EP 80301739 A EP80301739 A EP 80301739A EP 80301739 A EP80301739 A EP 80301739A EP 0034232 A2 EP0034232 A2 EP 0034232A2
Authority
EP
European Patent Office
Prior art keywords
grooves
metal
slip ring
electro
base
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Withdrawn
Application number
EP80301739A
Other languages
English (en)
French (fr)
Other versions
EP0034232A3 (de
Inventor
Ernest Henry Birch
Peter Barefoot
Michael Brendan Jakubiszyn
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.)
IDM Electronics Ltd
Original Assignee
IDM Electronics Ltd
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
Application filed by IDM Electronics Ltd filed Critical IDM Electronics Ltd
Publication of EP0034232A2 publication Critical patent/EP0034232A2/de
Publication of EP0034232A3 publication Critical patent/EP0034232A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/10—Manufacture of slip-rings

Definitions

  • This invention relates to a method of manufacturing slip rings in which an electro-less plating step is included during manufacture to deposit layers of conductive metal including a noble metal, and to slip rings produced by such a method.
  • An object of the invention is to produce a slip ring which, by eliminating certain high precision techniques involving highly skilled personnel and time-consuming operations, is capable of being produced far more economically than conventional slip rings.
  • a method of manufacturing a slip ring including the steps of providing a body of plastics material, forming a plurality of parallel grooves in a surface of the plastics body, treating the grooved surface to allow metal to be deposited thereon by an electro-less plating process, electro-less plating a layer of base metal on the treated grooved surface of the plastics body including the grooves thereof, removing the plated metal from between adjacent grooves to define individual tracks of the slip ring and electroplating to overlay the base metal in the grooves only with a nobl i e metal.
  • a method of manufacturing a slip ring including the steps of forming a cavity in a slip ring body of plastics material, forming terminal holes in the body extending between a surface of the body and the cavity, locating terminal pins within the holes and securing the pins in position by filling the cavity with an encapsulating medium, forming V-grooves in- said surface in line with the pins and exposing a portion of a pin at the base of each V-groove, electro-less plating a base layer of metal on said surface and on the walls of the grooves, removing said plated metal from between adjacent grooves to define individual tracks of the slip ring and replating to overlay the base metal in the grooves only with a noble metal.
  • 'slip ring' is intended to include discs or cylinders and thus to manufacture a slip ring in accordance with one embodiment of the method of the present invention using the electro-less plating method, a cylinder or disc is cast from plastics material consisting for example of an epoxy base filled resin, and all surfaces are machined to remove the resin rich skin. The plastics material is then cured and the disc or cylinder machined to obtain the required external profile leaving sufficient material to maintain rigidity for subsequent machining operations.
  • a cavity for the terminals is then machined in the body of plastics material and the body drilled with a plurality of holes for the terminals of the rings, each hole-having for example, a depth of between 0.6 mm and 0.7 mm and each terminal hole extends from the surface of the body opposite the cavity, through to the cavity.
  • Copper terminal pins are located within the holes and cemented in position.
  • the length of the terminals should each be for example, 70 to 80% of the ring width and project through the holes in the body of the ring, through the cavity formed in the body and slightly beyond the cavity extending radially or in any other direction. It is important to ensure that the ends of the terminal pins remote from the cavity lie flush with the surface of the plastics material.
  • the cavity is then filled with an encapsulating medium to fix the terminal pins in position.
  • the hand-painting step is eliminated by introducing an electro-less plating step and instead of machining square section grooves in the ring, V-grooves are machined in the plastics material in line with each terminal pin, exposing the head of each terminal pin only at the base of each V-shaped groove.
  • the grooved body of plastics material is treated in preparation for plating by an electro-less plating step and placed in the plating bath and a thin layer of copper is deposited uniformly in the V-grooves and between adjacent grooves. Peaks of copper may be deposited between the grooves and these peaks are machined away back to the plastics base to define the individual tracks of the ring.
  • the electro-less plating step provides a homogeneous bond between the copper terminal pins and the thin copper skin.
  • the ring is finally inserted in an electroplating bath of noble metal e.g. gold where the copper layer in each V-groove is overlaid with the noble metal.
  • noble metal e.g. gold
  • Peaks such as shown at 8 may be formed during plating and as shown in Figure 5, the peaks 8 between the grooves 6 are machined away to expose the plastics material and define the individual tracks of the ring and in Figure 6, the copper skin 7 in each groove has been overlaid with a noble metal layer 9 e.g. gold in an electro plating bath.
  • a noble metal layer 9 e.g. gold in an electro plating bath.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroplating Methods And Accessories (AREA)
EP80301739A 1980-02-15 1980-05-27 Verfahren zum Herstellen von Schleifringen und nach diesem Verfahren hergestellte Schleifringe Withdrawn EP0034232A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8005139A GB2069532A (en) 1980-02-15 1980-02-15 Method of manufacturing slip rings and to slip rings produced thereby
GB8005139 1980-02-15

Publications (2)

Publication Number Publication Date
EP0034232A2 true EP0034232A2 (de) 1981-08-26
EP0034232A3 EP0034232A3 (de) 1981-12-09

Family

ID=10511379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80301739A Withdrawn EP0034232A3 (de) 1980-02-15 1980-05-27 Verfahren zum Herstellen von Schleifringen und nach diesem Verfahren hergestellte Schleifringe

Country Status (2)

Country Link
EP (1) EP0034232A3 (de)
GB (1) GB2069532A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099944A1 (de) * 1982-07-22 1984-02-08 I.D.M. Electronics Limited Verfahren zur Herstellung von RF Schleifringen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509512A (en) * 1968-10-24 1970-04-28 Engelhard Min & Chem Slip ring assembly
DE1640591A1 (de) * 1967-02-22 1970-10-01 Ibm Herstellungsverfahren fuer Leitungsmuster auf plattenfoermige oder kartenfoermige Grundlagen
DE2142169A1 (de) * 1971-08-23 1973-03-01 Technograph International Deve Verfahren zum stromlosen auftragen eines kupferueberzuges und durch dieses verfahren hergestellte gedruckte schaltung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1640591A1 (de) * 1967-02-22 1970-10-01 Ibm Herstellungsverfahren fuer Leitungsmuster auf plattenfoermige oder kartenfoermige Grundlagen
US3509512A (en) * 1968-10-24 1970-04-28 Engelhard Min & Chem Slip ring assembly
DE2142169A1 (de) * 1971-08-23 1973-03-01 Technograph International Deve Verfahren zum stromlosen auftragen eines kupferueberzuges und durch dieses verfahren hergestellte gedruckte schaltung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099944A1 (de) * 1982-07-22 1984-02-08 I.D.M. Electronics Limited Verfahren zur Herstellung von RF Schleifringen

Also Published As

Publication number Publication date
GB2069532A (en) 1981-08-26
EP0034232A3 (de) 1981-12-09

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

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Designated state(s): CH DE FR GB IT NL SE

PUAL Search report despatched

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18D Application deemed to be withdrawn

Effective date: 19821120

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BIRCH, ERNEST HENRY

Inventor name: BAREFOOT, PETER

Inventor name: JAKUBISZYN, MICHAEL BRENDAN