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EP0133817A3 - Membrane switches - Google Patents

Membrane switches Download PDF

Info

Publication number
EP0133817A3
EP0133817A3 EP84305404A EP84305404A EP0133817A3 EP 0133817 A3 EP0133817 A3 EP 0133817A3 EP 84305404 A EP84305404 A EP 84305404A EP 84305404 A EP84305404 A EP 84305404A EP 0133817 A3 EP0133817 A3 EP 0133817A3
Authority
EP
European Patent Office
Prior art keywords
membrane
contacts
board
base board
contact
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Withdrawn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
EP84305404A
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
Application filed by British Telecommunications PLC filed Critical British Telecommunications PLC
Publication of EP0133817A2 publication Critical patent/EP0133817A2/en
Publication of EP0133817A3 publication Critical patent/EP0133817A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches 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
    • H01H13/78—Switches 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
    • H01H13/785—Switches 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches 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
    • H01H13/702—Switches 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/026—Material non precious
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/03—Composite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00—Connections
    • H01H2207/02—Solder
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/024—Properties of the substrate
    • H01H2209/032—Properties of the substrate non elastomeric
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00—Layers
    • H01H2209/068—Properties of the membrane
    • H01H2209/076—Properties of the membrane non elastomeric
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/002—Screen printing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/008—Die stamping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/016—Selective etching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/024—Packing between substrate and membrane
    • H01H2229/028—Adhesive
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/038—Folding of flexible printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/008—Static electricity considerations

Landscapes

  • Push-Button Switches (AREA)

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.
EP84305404A 1983-08-11 1984-08-08 Membrane switches Withdrawn EP0133817A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8321689 1983-08-11
GB838321689A GB8321689D0 (en) 1983-08-11 1983-08-11 Membrane switches

Publications (2)

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

Family

ID=10547180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84305404A 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 (7)

* 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
IT1208461B (en) * 1987-01-30 1989-06-22 Granarolo Dell Emilia Bo Melic SHOCKPROOF PROTECTIVE CASE FOR REMOTE CONTROLS IN PARTICULAR OF TVS
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 PACKING COMPONENT COMPRISING A THIN CONTROL LAYER FORMING A SWITCH
CN106994924A (en) * 2017-05-18 2017-08-01 上海安闻汽车电子有限公司 A kind of human pressure's sensor and automotive seat
SG11202007327SA (en) 2018-02-01 2020-08-28 Razer Asia Pacific Pte Ltd Key switch mechanisms, user input devices and methods of fabricating a key switch mechanism

Citations (4)

* 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
AT370912B (en) * 1980-09-17 1983-05-10 Electrovac DEVICE FOR SWITCHING ONE OR MORE ELECTRICAL CIRCUITS

Patent Citations (4)

* 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
AT370912B (en) * 1980-09-17 1983-05-10 Electrovac DEVICE FOR SWITCHING ONE OR MORE ELECTRICAL CIRCUITS

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
EP0133817A2 (en) 1985-03-06
WO1985000923A1 (en) 1985-02-28
GB8321689D0 (en) 1983-09-14
GB8420140D0 (en) 1984-09-12
GB2144917A (en) 1985-03-13

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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

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

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

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19851210

R18D Application deemed to be withdrawn (corrected)

Effective date: 19851211

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HILTON, GEOFFREY THOMAS