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EP0410766A1 - Perfectionnement dans ou concernant des dispositifs électriques comprenant des connecteurs électriques - Google Patents

Perfectionnement dans ou concernant des dispositifs électriques comprenant des connecteurs électriques Download PDF

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Publication number
EP0410766A1
EP0410766A1 EP90308227A EP90308227A EP0410766A1 EP 0410766 A1 EP0410766 A1 EP 0410766A1 EP 90308227 A EP90308227 A EP 90308227A EP 90308227 A EP90308227 A EP 90308227A EP 0410766 A1 EP0410766 A1 EP 0410766A1
Authority
EP
European Patent Office
Prior art keywords
substrate
film
connector member
type track
electrical device
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Withdrawn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
EP90308227A
Other languages
German (de)
English (en)
Inventor
Colin Ivan Terry
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.)
EMI Group Ltd
Original Assignee
Thorn EMI PLC
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 Thorn EMI PLC filed Critical Thorn EMI PLC
Publication of EP0410766A1 publication Critical patent/EP0410766A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/84—Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/016—Heaters using particular connecting means

Definitions

  • the present invention relates to electrical devices in the form of electrically resistive tracks made from conductive inks, especially inks comprising a polymeric binder and an electrically conductive constituent, and in particular to such a track for use as a heating track.
  • the present invention also provides a novel method of making an electrical connection to such an electrically resistive track and is particularly applicable to the conductive polymer ink disclosed and claimed in our co-pending British Patent Application No. 8917078.1.
  • Conductive polymer inks are known in the art, eg as disclosed in Japanese Patent Application No. 60-218689 laid open under No. 62-74975 (Nihon Shastin Insatsu) which relates to electrically conductive inks for use in manufacturing printed circuit boards and hybrid boards for electronic parts.
  • the document discloses that generally inks in which the binder is a thermoplastic resin show no problems with electrical characteristics or suitability for printing onto a substrate. However, when an attempt is made to solder an electrical connection to the printed electrical part, solder bubbles and blisters can be produced on the surface of the printed electrical part making it unsuitable for its intended use.
  • thermoplastic resin chosen from a group termed 'heat resisting engineering plastics' which are heat-resistant and so to which soldered connections can be made.
  • 'heat-resisting engineering plastics' are not produced in high volume and consequently are relatively expensive.
  • the methods available for making an electrical connection to the device are further limited.
  • an eyelet is fixed through the electrical part formed from the polymer ink and through the substrate on which the electrical part is printed.
  • a connector system can only be used with substrates through which suitable holes can be made and, furthermore, it can be difficult to ensure that a low resistance connection to the device has been achieved.
  • the present invention seeks to provide an electrical device in the form of a film-type track in which both of the above requirements are achieved.
  • an electrical device comprising an electrically resistive film-type track supported on a substrate, and a connector member for providing an electrical connection to the film-type track, wherein the connector member is bonded to the substrate, thereby to provide a mechanical bonding connection between the connector member and the substrate, and the film-type track is arranged to overlie at least a portion of the connector member.
  • the film-type track comprises a conductive polymer ink including a polymeric binder and an electrically conductive constituent.
  • the connector member comprises a sheet-like metallic element which, preferably, comprises nickel.
  • the film-type track may comprise a heating element and the connector element may be adhesively bonded to the substrate, such as by epoxy resin.
  • the substrate may comprise a mirror which, for example, may be an automotive vehicle mirror or a mirror for use in dentistry.
  • the present invention also provides a method of forming an electrical connection to a film-type track supported on a substrate, the method comprising bonding a connector member to the substrate and forming the film-type track on the substrate in a position such that the film-type track is arranged to overlie at least a portion of the connector element bonded to the substrate.
  • Figure 1 shows a first substrate 2 and a second substrate 4 formed of insulating material.
  • the second substrate 4 is required if the first substrate 2 is electrically conductive.
  • a connector member 5 is provided which, in the embodiment shown is a short length of sheet metal, eg of nickel, cut to shape and cleaned, one end 6 of which is fixed flat to the substrate 4 by a high strength adhesive layer 7, eg epoxy.
  • An electrical part such as an electrically resistive film-type heater track 8 is supported on the second substrate 4 and arranged so as to overlap the end 6 of the connector member 5.
  • an electrically resistive film-type heater track 8 is supported on the second substrate 4 and arranged so as to overlap the end 6 of the connector member 5.
  • the adhesion of the connector member 5 to the substrate 4 is achieved solely by the adhesive 7, the strength of the mechanical bond achieved between the connector member 5 and the heater track is not important. It is only important to ensure that good low resistance electrical communication is achieved between the track 8 and the connector member 5.
  • the heater track 8 can be deposited by a variety of methods, such as screen-printing.
  • a low contact resistance between the heater track 8 and the connector member 5 is achieved by ensuring that a sufficient area of the connector member 5 is overlapped by the heater track 8.
  • the resistance between the connector member 5 and the track 8 is considerably less than the resistance of the heater track 8, alleviating the risk of 'burn out' due to local overheating at the point of connection.
  • the track material so deposited is then dried or set.
  • the distal end 9 of the bonded connector member 5 is shaped to produce a tag contact to which electrical supply wires can be fixed, such as by soldering or crimping.
  • the present invention appreciates that a good mechanical bond strength between a connector and electrical part, such as the heater elements, can be achieved by adhering the connector directly to the substrate instead of via the heater track or other electrical part.
  • the invention is particularly applicable to systems in which the electrical part to which connection is made is formed from a conductive polymer ink as it obviates the need for soldered connections to the electrical part and can be used on substrates, flexible or rigid, in which it is not possible to use eyelet connectors.
  • the present invention makes possible the manufacture of units in which a heating track formed from a conductive polymer ink is applied to a rigid substrate such as a mirror 10, as shown in figure 2.
  • Known units for heating mirrors are relatively costly and complex to manufacture.
  • a laminated assembly is applied to the rear of the mirror substrate.
  • This laminated assembly consists of a sandwich of polymer sheets between which are a multitude of resistors formed from bands of high resistance pastes. A number of silver interdigitative fingers connect the resistors in parallel giving a net resistance of the required value.
  • conductors and resistors are formed from an etched foil material on the rear surface of the mirror.
  • the mirror 10 comprises a glass layer 12 coated with an aluminium reflective layer 14.
  • the aluminium layer 14 is covered with a film 16 of thickness 0.08mm.
  • the film 16 is made of a material such as a pressure sensitive polyester film which will withstand temperatures of up to around 120 o C.
  • the film 16 serves two purposes: a) to provide an insulating layer between the aluminium layer and a heater track; b) (in the case of car mirrors) to provide a layer which prevents the glass layer 12 from fragmenting if it should be broken.
  • Connectors 17, only one of which is shown in Figure 2 are adhered to the film 16 after which a conductive polymer ink is deposited onto the film 16 by a printing process, such as screen printing.
  • the resistance of the track provided and hence its heating effect can be varied considerably by choice of track material and design.
  • the ink is then dried or set to form an electrically conductive track 18 having the required resistance.
  • An insulating top layer 20 may be applied if necessary which can serve to protect the conductive track lB and also to improve the heating effect of the track 18 on the glass layer 12, i.e. the visible surface of the mirror.
  • a suitable polymer ink for screen printing to provide a heating element is disclosed in our co-pending British Patent Application No. 8917078.1.
  • this ink contains equal volumes of nickel powder and carbon black in a binder comprising a solution of poly (vinyl butyral) in N-methyl-2-pyrrolidone.
  • the screen printing medium used is Blythe Medium type 63/182 combined with unaccelerated unsaturated polyester in styrene.
  • a heatable mirror may be provided in which the heating element and the mirror are in much closer contact than in known arrangements.
  • the heating effect of the heating element on the mirror is improved.
  • the mass of material constituting the heating element and, therefore, the mass of material to be heated (other than the mirror) is reduced, hence providing a faster response.
  • the heatable mirrors of the present invention are able to provide the same heating performance, in terms of ultimate thermal gain, in one third of the time using one half of the power.

Landscapes

  • Surface Heating Bodies (AREA)
  • Resistance Heating (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Details Of Resistors (AREA)
EP90308227A 1989-07-26 1990-07-26 Perfectionnement dans ou concernant des dispositifs électriques comprenant des connecteurs électriques Withdrawn EP0410766A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8917077 1989-07-26
GB898917077A GB8917077D0 (en) 1989-07-26 1989-07-26 Electrically resistive tracks made from conductive polymer inks

Publications (1)

Publication Number Publication Date
EP0410766A1 true EP0410766A1 (fr) 1991-01-30

Family

ID=10660649

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90308227A Withdrawn EP0410766A1 (fr) 1989-07-26 1990-07-26 Perfectionnement dans ou concernant des dispositifs électriques comprenant des connecteurs électriques

Country Status (5)

Country Link
EP (1) EP0410766A1 (fr)
JP (1) JPH03149792A (fr)
AU (1) AU5983690A (fr)
CA (1) CA2021937A1 (fr)
GB (1) GB8917077D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001056334A1 (fr) * 2000-01-25 2001-08-02 Società Italiana Vetro - Siv - S.P.A. Vitrage muni d'une borne electrique
EP1128744A1 (fr) * 1998-04-30 2001-09-05 PPG Industries Ohio, Inc. Procede d'application de barre omnibus et patte metalliques

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5459533A (en) * 1993-11-12 1995-10-17 See Clear Eyewear Inc. Defogging eye wear

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371116A1 (fr) * 1976-11-15 1978-06-09 Britax Wingard Ltd Miroirs chauffes et leurs procedes de fabrication
EP0025755A1 (fr) * 1979-09-08 1981-03-25 Saint Gobain Vitrage International Vitrage chauffant à film résistant mince
EP0172302A1 (fr) * 1984-03-02 1986-02-26 Tokyo Cosmos Electric Co., Ltd. Elément chauffant à résistance électrique de forme plane
GB2184929A (en) * 1985-12-13 1987-07-01 Nippon Sheet Glass Co Ltd Electrically conductive glass sheet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2371116A1 (fr) * 1976-11-15 1978-06-09 Britax Wingard Ltd Miroirs chauffes et leurs procedes de fabrication
EP0025755A1 (fr) * 1979-09-08 1981-03-25 Saint Gobain Vitrage International Vitrage chauffant à film résistant mince
EP0172302A1 (fr) * 1984-03-02 1986-02-26 Tokyo Cosmos Electric Co., Ltd. Elément chauffant à résistance électrique de forme plane
GB2184929A (en) * 1985-12-13 1987-07-01 Nippon Sheet Glass Co Ltd Electrically conductive glass sheet

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1128744A1 (fr) * 1998-04-30 2001-09-05 PPG Industries Ohio, Inc. Procede d'application de barre omnibus et patte metalliques
EP1128744A4 (fr) * 1998-04-30 2004-09-01 Ppg Ind Ohio Inc Procede d'application de barre omnibus et patte metalliques
WO2001056334A1 (fr) * 2000-01-25 2001-08-02 Società Italiana Vetro - Siv - S.P.A. Vitrage muni d'une borne electrique
US6774342B2 (en) 2000-01-25 2004-08-10 Societa Italiana Vetro - Siv S.P.A. Glazing with electrical terminal
USRE41715E1 (en) * 2000-01-25 2010-09-21 Pilkington Italia S.P.A. Glazing with electrical terminal

Also Published As

Publication number Publication date
JPH03149792A (ja) 1991-06-26
GB8917077D0 (en) 1989-09-13
CA2021937A1 (fr) 1991-01-27
AU5983690A (en) 1991-01-31

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