GB1412298A - Electrical signal initiating keyboards - Google Patents

Electrical signal initiating keyboards

Info

Publication number
GB1412298A
GB1412298A GB4105072A GB4105072A GB1412298A GB 1412298 A GB1412298 A GB 1412298A GB 4105072 A GB4105072 A GB 4105072A GB 4105072 A GB4105072 A GB 4105072A GB 1412298 A GB1412298 A GB 1412298A
Authority
GB
United Kingdom
Prior art keywords
tracks
signals
layer
keyboards
electrical signal
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
GB4105072A
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.)
Post Office
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Priority to GB4105072A priority Critical patent/GB1412298A/en
Publication of GB1412298A publication Critical patent/GB1412298A/en
Expired 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
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/967—Switches controlled by moving an element forming part of the switch having a plurality of control members, e.g. keyboard
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
    • H03M11/22—Static coding
    • H03M11/24—Static coding using analogue means, e.g. by coding the states of multiple switches into a single multi-level analogue signal or by indicating the type of a device using the voltage level at a specific tap of a resistive divider
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2201/00—Contacts
    • H01H2201/022—Material
    • H01H2201/032—Conductive polymer; Rubber
    • H01H2201/036—Variable resistance

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Push-Button Switches (AREA)

Abstract

1412298 Keyboards POST OFFICE 29 Nov 1973 [5 Sept 1972] 41050/72 Heading G4H [Also in Division H1] An electrical signal initiating keyboard includes a number of motion transmitting elements, a layer of resiliently deformable insulating foam material having at one face thereof a plurality of electrically-conductive tracks defined by conductive particles, and a plurality of terminals connected to associated ones of the tracks, the arrangement being that each motion transmitting element is operable to deform a respective area of the foam material to thereby change the resistance between terminals associated with that particular area. Fig. 3 shows a typical key 3, depression of which compresses a respective area of a sheet 1 of insulating foam so that a respective two out of fifteen tracks 2 of conductive particles make contact, through a respective hole 13 in a spacer 12, with a conducting layer 14. Seven signals are applied to the fifteen tracks through connections whereby three of the signals go to a respective track each and the other four signals go to a respective three of the tracks each. Consequently, the layer 14 receives two out of seven of the signals depending on the key pressed. Fig. 5 shows a modification in which the keys are integral with the top plate which is flexible, and the foam sheet 1 and the conducting layer 14 are interchanged, layer 14 being of flexible polymeric material. The spacer may be omitted.
GB4105072A 1972-09-05 1972-09-05 Electrical signal initiating keyboards Expired GB1412298A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4105072A GB1412298A (en) 1972-09-05 1972-09-05 Electrical signal initiating keyboards

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4105072A GB1412298A (en) 1972-09-05 1972-09-05 Electrical signal initiating keyboards

Publications (1)

Publication Number Publication Date
GB1412298A true GB1412298A (en) 1975-11-05

Family

ID=10417873

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4105072A Expired GB1412298A (en) 1972-09-05 1972-09-05 Electrical signal initiating keyboards

Country Status (1)

Country Link
GB (1) GB1412298A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535486A1 (en) * 1982-10-27 1984-05-04 Danish Sherif MULTI-KEY KEYBOARD FOR DATA ENTRY INTO A COMPUTER
FR2590754A1 (en) * 1985-11-22 1987-05-29 Morse Nena TELEPHONE SWITCH WITH KEYBOARD WITH TOUCHES RESISTANT TO VANDALISM
GB2191617A (en) * 1986-06-11 1987-12-16 Salplex Ltd Manually operable electrical switches for signalling & control
US8674932B2 (en) 1996-07-05 2014-03-18 Anascape, Ltd. Image controller
US9081426B2 (en) 1992-03-05 2015-07-14 Anascape, Ltd. Image controller

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535486A1 (en) * 1982-10-27 1984-05-04 Danish Sherif MULTI-KEY KEYBOARD FOR DATA ENTRY INTO A COMPUTER
US4555693A (en) * 1982-10-27 1985-11-26 Polytel Corp. Multikey keyboard for inputting data into a computer
FR2590754A1 (en) * 1985-11-22 1987-05-29 Morse Nena TELEPHONE SWITCH WITH KEYBOARD WITH TOUCHES RESISTANT TO VANDALISM
GB2191617A (en) * 1986-06-11 1987-12-16 Salplex Ltd Manually operable electrical switches for signalling & control
US4777378A (en) * 1986-06-11 1988-10-11 Salplex Limited Information handling and control systems, manually operable electrical switches for use in such systems, and methods of testing such switches in such systems
GB2191617B (en) * 1986-06-11 1990-09-19 Salplex Ltd Manually operable electrical switches for use in information handling and control systems
US9081426B2 (en) 1992-03-05 2015-07-14 Anascape, Ltd. Image controller
US8674932B2 (en) 1996-07-05 2014-03-18 Anascape, Ltd. Image controller

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee
732 Registration of transactions, instruments or events in the register (sect. 32/1977)