GB1185676A - A Circuit Arrangement for a Contactless Keyboard - Google Patents

A Circuit Arrangement for a Contactless Keyboard

Info

Publication number
GB1185676A
GB1185676A GB1927267A GB1927267A GB1185676A GB 1185676 A GB1185676 A GB 1185676A GB 1927267 A GB1927267 A GB 1927267A GB 1927267 A GB1927267 A GB 1927267A GB 1185676 A GB1185676 A GB 1185676A
Authority
GB
United Kingdom
Prior art keywords
keying
elements
finger pressure
keyboard
output circuit
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
GB1927267A
Inventor
Joachim Lehmann
Kurt Urban
Adolf Gentemann
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.)
Elektronische Rechenmaschinen Wissenschaftlicher Industriebetrieb VEB
Original Assignee
Elektronische Rechenmaschinen Wissenschaftlicher Industriebetrieb VEB
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 Elektronische Rechenmaschinen Wissenschaftlicher Industriebetrieb VEB filed Critical Elektronische Rechenmaschinen Wissenschaftlicher Industriebetrieb VEB
Publication of GB1185676A publication Critical patent/GB1185676A/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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • 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
    • 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

Landscapes

  • Input From Keyboards Or The Like (AREA)

Abstract

1,185,676. Touch controlled circuits. ELEKTRONISCHE RECHENMASCHINEN KARLMARX-STADT VEB. 26 April, 1967, No. 19272/67. Heading H3B. [Also in Division G4] A circuit includes a non-contact-making keying element comprising passive electrical components connected between a voltage source and an output circuit via a decoupling device, the voltage supplied to the output circuit being controllable by finger pressure on the keying element. Fig. 1 shows a plurality of such elements arranged to form a keyboard, each element comprising a variable capacitor 2 and resistor 3, connected to transistor amplifiers 7, 8, 9, 10 by way of diodes 4, 5, the connections being such that input information, represented by finger pressure on one of the keying elements is coded in the excess-3-code. One or more further transistors may be connected to the keying elements to indicate that the keyboard is operative, the further transistor being biased to operate at a greater finger pressure than the others. Capacitor 2 may consist of a metal diaphragm as one plate separated from a fixed metal plate by a layer of barium titanate, a film of glycerine and an air gap. Alternatively, both plates may be formed of a conducting plastic or resilient material or such a material may be provided on the inside of the flexible plate. Instead of a diaphragm a movable rigid metal member may be provided. The key elements may incorporate means for signalling actuation of the key.
GB1927267A 1967-04-03 1967-04-26 A Circuit Arrangement for a Contactless Keyboard Expired GB1185676A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV0033358 1967-04-03

Publications (1)

Publication Number Publication Date
GB1185676A true GB1185676A (en) 1970-03-25

Family

ID=7588043

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1927267A Expired GB1185676A (en) 1967-04-03 1967-04-26 A Circuit Arrangement for a Contactless Keyboard

Country Status (3)

Country Link
DE (1) DE1549570A1 (en)
GB (1) GB1185676A (en)
NL (1) NL6705136A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668660A (en) * 1970-12-16 1972-06-06 Plessey Handel Investment Ag Touch wire displays
FR2161969A1 (en) * 1971-11-30 1973-07-13 Ibm
US3951250A (en) * 1973-04-06 1976-04-20 Alphameric Keyboards Limited Capacitive key for electronic circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242676A (en) * 1977-12-29 1980-12-30 Centre Electronique Horloger Sa Interactive device for data input into an instrument of small dimensions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3668660A (en) * 1970-12-16 1972-06-06 Plessey Handel Investment Ag Touch wire displays
FR2161969A1 (en) * 1971-11-30 1973-07-13 Ibm
US3951250A (en) * 1973-04-06 1976-04-20 Alphameric Keyboards Limited Capacitive key for electronic circuit

Also Published As

Publication number Publication date
DE1549570A1 (en) 1971-03-04
NL6705136A (en) 1968-10-14

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees