GB1134704A - A circuit for a touch keyboard - Google Patents

A circuit for a touch keyboard

Info

Publication number
GB1134704A
GB1134704A GB631566A GB631566A GB1134704A GB 1134704 A GB1134704 A GB 1134704A GB 631566 A GB631566 A GB 631566A GB 631566 A GB631566 A GB 631566A GB 1134704 A GB1134704 A GB 1134704A
Authority
GB
United Kingdom
Prior art keywords
capacitor
cycles
terminal
diode
discharge
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
GB631566A
Inventor
Daniel Matthew Taub
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to GB631566A priority Critical patent/GB1134704A/en
Priority to JP8494266A priority patent/JPS4424651B1/ja
Priority to FR06008334A priority patent/FR1511850A/en
Priority to DE19671588325 priority patent/DE1588325C3/en
Publication of GB1134704A publication Critical patent/GB1134704A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03K17/975—Switches controlled by moving an element forming part of the switch using a capacitive movable element
    • H03K17/98—Switches controlled by moving an element forming part of the switch using a capacitive movable element having a plurality of control members, e.g. keyboard
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/52—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of gas-filled tubes
    • 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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches

Landscapes

  • Electronic Switches (AREA)

Abstract

1,134,704. Typewriters &c. keyboards. INTERNATIONAL BUSINESS MACHINES CORP. 12 Feb., 1966, No. 6315/66. Heading B6F. [Also in Division H3] A circuit for use in a " touch keyboard " comprises a capacitor 6 arranged to be charged via one path 8 and discharged via another path and provided with means for blocking the discharge path so that a charge builds up on the capacitor 6. As described, capacitor 6 tends to charge via diode 8 during positive half-cycles of a positively-biased square wave at terminal 5 and tends to discharge via diode 10 during negative half-cycles at 5. The introduction of a capacitance 4 of an operator touching a terminal 3 or a dielectric applied thereto, will result in capacitance 4 charging via diode 11 during positive half-cycles at 5 so as to block diode 10 and thus prevent discharge. The voltage on capacitor 6 thus builds up incrementally until the cold cathode tube 2 becomes triggered, illuminating the key associated with terminal 3. In Fig. 3 (not shown) anti-phased or other square waves are applied to separate terminals associated with resistors 7, 9.
GB631566A 1966-02-12 1966-02-12 A circuit for a touch keyboard Expired GB1134704A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB631566A GB1134704A (en) 1966-02-12 1966-02-12 A circuit for a touch keyboard
JP8494266A JPS4424651B1 (en) 1966-02-12 1966-12-27
FR06008334A FR1511850A (en) 1966-02-12 1967-01-31 Electrical circuit
DE19671588325 DE1588325C3 (en) 1966-02-12 1967-02-10 Capacitive touch switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB631566A GB1134704A (en) 1966-02-12 1966-02-12 A circuit for a touch keyboard

Publications (1)

Publication Number Publication Date
GB1134704A true GB1134704A (en) 1968-11-27

Family

ID=9812267

Family Applications (1)

Application Number Title Priority Date Filing Date
GB631566A Expired GB1134704A (en) 1966-02-12 1966-02-12 A circuit for a touch keyboard

Country Status (4)

Country Link
JP (1) JPS4424651B1 (en)
DE (1) DE1588325C3 (en)
FR (1) FR1511850A (en)
GB (1) GB1134704A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2439509A1 (en) * 1978-10-19 1980-05-16 Gen Electric CAPACITIVE-TYPE TOUCH SENSOR WITH A SINGLE ELECTRODE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2439509A1 (en) * 1978-10-19 1980-05-16 Gen Electric CAPACITIVE-TYPE TOUCH SENSOR WITH A SINGLE ELECTRODE

Also Published As

Publication number Publication date
DE1588325B2 (en) 1974-05-30
DE1588325C3 (en) 1975-01-09
JPS4424651B1 (en) 1969-10-18
DE1588325A1 (en) 1970-09-17
FR1511850A (en) 1968-02-02

Similar Documents

Publication Publication Date Title
GB1171423A (en) Improvements in Vacuum Type Circuit Interrupter
GB1414505A (en) Intrusion alarm
GB771625A (en) Electric charge storage apparatus
GB1134704A (en) A circuit for a touch keyboard
GB939093A (en) Power control circuit
GB813307A (en) Transistor integrating circuits
GB962417A (en) Improvements in and relating to ignition circuit arrangements
US3787738A (en) Pulse producing circuit
GB1278301A (en) Electrostatic copying process
US2752530A (en) Impulse coincidence circuit
GB1161443A (en) Improvements in Vacuum Type Circuit Interrupters
GB982453A (en) Improvements in transistor circuits
US2753489A (en) Switching device
GB1462777A (en) Touch actuated electronic switch
NIKOLAEV Relation between high-voltage discharge in a vacuum at a frequency of 25 mc and the electrode configuration
GB817635A (en) Improvements in or relating to printed circuit assemblies
GB1164065A (en) Synchronous Symmetrical Switching Circuit
GB1212578A (en) Capacitor charge replacement circuit
GB786060A (en) Improvements in or relating to data storage devices
GB761688A (en) Improvements in or relating to circuit arrangements for operating low pressure electric discharge lamps
SHIDLOVSKII Problem of the flow of an electrically conducting viscous gas in the neighborhood of a porous plate and in the presence of a magnetic field
CA638969A (en) Starting and operating circuit for arc discharge device
GB1406586A (en) Electrical apparatus provided with circuit means comprising a touch-sensitive switch
GB705552A (en) Improvements in and relating to electrical information storage apparatus
GB1025732A (en) Improvements in composite electrical circuit units