GB1462777A - Touch actuated electronic switch - Google Patents

Touch actuated electronic switch

Info

Publication number
GB1462777A
GB1462777A GB5587473A GB5587473A GB1462777A GB 1462777 A GB1462777 A GB 1462777A GB 5587473 A GB5587473 A GB 5587473A GB 5587473 A GB5587473 A GB 5587473A GB 1462777 A GB1462777 A GB 1462777A
Authority
GB
United Kingdom
Prior art keywords
amplifier
touch plate
touch
capacitor
operator
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
GB5587473A
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.)
Magic Dot Inc
Original Assignee
Magic Dot Inc
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 Magic Dot Inc filed Critical Magic Dot Inc
Publication of GB1462777A publication Critical patent/GB1462777A/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

Landscapes

  • Electronic Switches (AREA)
  • Position Input By Displaying (AREA)
  • Amplifiers (AREA)

Abstract

1462777 Touch responsive switching systems MAGIC DOT Inc 3 Dec 1973 [12 Jan 1973] 55874/73 Heading G1N In a touch operated switch the touch plate 12 is connected to one input 26 of a differential amplifier 78 to both inputs 24, 26 of which are also supplied an alternating common mode voltage from source 22 and the output of which is coupled to an integrator 16. The amplifier 78 is provided with a capacitor 82 to provide a shunt at the alternating frequency of the common mode voltage for the amplifier output. Initially when touch plate 12 is not touched the amplifier 78 is balanced and the circuit is arranged so that the voltage at 140 is at the supply voltage. Transistor 168 of amplifier 165 is biased off and there is no voltage across integrating capacitor 16. Amplifier 18 including Darlington pair 184, 186 is non-conducting and there is a high impedance across terminals 204, 84. When the touch plate is touched by an operator current flows from source 22 to earth through the capacitance of the operator's body resulting in amplifier 78 being unbalanced. When the output of amplifier 78 changes state 140 is at earth potential so that transistor 168 is turned on and capacitor 16 charged. Amplifier 18 becomes conducting and the impedance across terminals 204, 84 changes to a low value. The lead 30 to the touch plate is twisted in a pair with conductor 28 to obtain a better noise suppression. By appropriate modification of the circuit the potentials at 140 may be opposite to those described above. In a modification, Fig. 2 (not shown) the touch plate 12 is connected to terminal 24 and a capacitor of value equivalent to that of an operator is coupled between input terminal 26 and ground. In this arrangement the differential amplifier is unbalanced normally but becomes balanced when the operator touches the touch plate.
GB5587473A 1973-01-12 1973-12-03 Touch actuated electronic switch Expired GB1462777A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32330373A 1973-01-12 1973-01-12

Publications (1)

Publication Number Publication Date
GB1462777A true GB1462777A (en) 1977-01-26

Family

ID=23258607

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5587473A Expired GB1462777A (en) 1973-01-12 1973-12-03 Touch actuated electronic switch

Country Status (9)

Country Link
JP (1) JPS49109870A (en)
CA (1) CA1022642A (en)
CH (1) CH578806A5 (en)
DE (1) DE2400644A1 (en)
FR (1) FR2298234A1 (en)
GB (1) GB1462777A (en)
IL (1) IL43873A (en)
IT (1) IT1000569B (en)
ZA (1) ZA739255B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117117A (en) * 1982-03-19 1983-10-05 Starcote Limited Touch responsive switching arrangement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992634A (en) * 1975-05-09 1976-11-16 Magic Dot, Inc. Touch actuated electronic switch including protection from high potential electricity
US4081700A (en) * 1976-06-16 1978-03-28 Hamilton Ii William F Touch control switch circuit with compensation for power supply line fluctuations
US4731548A (en) * 1986-09-29 1988-03-15 Nartron Corporation Touch control switch circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1466304B2 (en) * 1964-10-31 1969-09-11 Siemens AG, Berlin und München, 8520 Erlangen Device for generating a signaling or control voltage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117117A (en) * 1982-03-19 1983-10-05 Starcote Limited Touch responsive switching arrangement

Also Published As

Publication number Publication date
FR2298234B1 (en) 1979-05-11
CA1022642A (en) 1977-12-13
ZA739255B (en) 1974-10-30
DE2400644A1 (en) 1974-08-08
IL43873A (en) 1976-08-31
CH578806A5 (en) 1976-08-13
FR2298234A1 (en) 1976-08-13
JPS49109870A (en) 1974-10-18
AU6343873A (en) 1975-06-12
IT1000569B (en) 1976-04-10
IL43873A0 (en) 1974-03-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee