EP0133817A3 - Membrane switches - Google Patents

Membrane switches

Info

Publication number
EP0133817A3
EP0133817A3 EP19840305404 EP84305404A EP0133817A3 EP 0133817 A3 EP0133817 A3 EP 0133817A3 EP 19840305404 EP19840305404 EP 19840305404 EP 84305404 A EP84305404 A EP 84305404A EP 0133817 A3 EP0133817 A3 EP 0133817A3
Authority
EP
Grant status
Application
Patent type
Prior art keywords
membrane
board
contacts
amp
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Withdrawn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
EP19840305404
Other languages
German (de)
French (fr)
Other versions
EP0133817A2 (en )
Inventor
Geoffrey Thomas Hilton
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.)
British Telecommunications PLC
Original Assignee
British Telecommunications 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

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/78Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
    • H01H13/785Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the material of the contacts, e.g. conductive polymers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00Contacts
    • H01H2201/022Material
    • H01H2201/026Material non precious
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00Contacts
    • H01H2201/022Material
    • H01H2201/03Composite
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00Connections
    • H01H2207/02Solder
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00Layers
    • H01H2209/024Properties of the substrate
    • H01H2209/032Properties of the substrate non elastomeric
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00Layers
    • H01H2209/068Properties of the membrane
    • H01H2209/076Properties of the membrane non elastomeric
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00Manufacturing
    • H01H2229/002Screen printing
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00Manufacturing
    • H01H2229/008Die stamping
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00Manufacturing
    • H01H2229/016Selective etching
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00Manufacturing
    • H01H2229/024Packing between substrate and membrane
    • H01H2229/028Adhesive
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00Manufacturing
    • H01H2229/038Folding of flexible printed circuit
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00Miscellaneous
    • H01H2239/008Static electricity considerations

Abstract

A membrane switch panel has a printed circuit base board (20) carrying bare copper electrical circuitry (26) and contacts (26 & 28). A flexible, non-elastomer, laminar membrane (22) overlays the board (20) and also carries a bare-copper contact (24). An electrically insulating spacer (3) is provided between the board (20) and the membrane, but it is provided with an opening to allow the contact (24) upon local depression of the membrane to bridge the contacts (26 & 28) in the base board (20).
The membrane (22) is adhesively sealed to the base board (20) enclosing an atmosphere of limited tarnishing ability for the contacts (20, 26 & 28) to maintain a low contact resistance and allow non-precious metals to be used for contacts.
EP19840305404 1983-08-11 1984-08-08 Membrane switches Withdrawn EP0133817A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8321689A GB8321689D0 (en) 1983-08-11 1983-08-11 Membrane switches
GB8321689 1983-08-11

Publications (2)

Publication Number Publication Date
EP0133817A2 true EP0133817A2 (en) 1985-03-06
EP0133817A3 true true EP0133817A3 (en) 1985-04-10

Family

ID=10547180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840305404 Withdrawn EP0133817A3 (en) 1983-08-11 1984-08-08 Membrane switches

Country Status (3)

Country Link
EP (1) EP0133817A3 (en)
GB (2) GB8321689D0 (en)
WO (1) WO1985000923A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4713534A (en) * 1986-02-18 1987-12-15 Carroll Touch Inc. Phototransistor apparatus with current injection ambient compensation
GB2200499B (en) * 1987-01-30 1990-04-25 Meliconi Srl A shockproof protective sheath for remote controls, in particular those of television receivers
US6958183B2 (en) * 2001-02-20 2005-10-25 Teikoku Tsushin Kogyo Co., Ltd. Key top plate and a method for manufacturing the same
GB2421635B (en) * 2004-12-24 2007-12-05 In2Connect Ltd A switch
FR2881091B1 (en) * 2005-01-24 2007-08-24 Cera trim component comprising a thin film forming control switch

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862381A (en) * 1973-10-29 1975-01-21 Chomerics Inc Keyboard switch assembly with multilayer, coextensive contactor means
US4314114A (en) * 1980-02-04 1982-02-02 Oak Industries Laminated membrane switch
US4338502A (en) * 1978-04-27 1982-07-06 Sharp Kabushiki Kaisha Metallic housing for an electronic apparatus with a flat keyboard

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3862381A (en) * 1973-10-29 1975-01-21 Chomerics Inc Keyboard switch assembly with multilayer, coextensive contactor means
US4338502A (en) * 1978-04-27 1982-07-06 Sharp Kabushiki Kaisha Metallic housing for an electronic apparatus with a flat keyboard
US4314114A (en) * 1980-02-04 1982-02-02 Oak Industries Laminated membrane switch

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
L.B. HUNT et al.: "Electrical contacts", 1946, pages 74,85,86, Johnson, Matthey & Co. Ltd., London, GB; *
RADIO FERNSEHEN ELEKTRONIK, vol. 32, no. 6, June 1983, page 341, Berlin, DD; "Folienmembranschalter" *

Also Published As

Publication number Publication date Type
GB2144917A (en) 1985-03-13 application
EP0133817A2 (en) 1985-03-06 application
GB8321689D0 (en) 1983-09-14 grant
GB8420140D0 (en) 1984-09-12 grant
WO1985000923A1 (en) 1985-02-28 application

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Legal Events

Date Code Title Description
AK Designated contracting states:

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

AK Designated contracting states:

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

18D Deemed to be withdrawn

Effective date: 19851210

R18D Ep-application deemed to be withdrawn: (correction)

Effective date: 19851211

RIN1 Inventor (correction)

Inventor name: HILTON, GEOFFREY THOMAS