GB2005422A - Proximity switches - Google Patents

Proximity switches

Info

Publication number
GB2005422A
GB2005422A GB7838505A GB7838505A GB2005422A GB 2005422 A GB2005422 A GB 2005422A GB 7838505 A GB7838505 A GB 7838505A GB 7838505 A GB7838505 A GB 7838505A GB 2005422 A GB2005422 A GB 2005422A
Authority
GB
United Kingdom
Prior art keywords
electrode
oscillator
response
screening
response electrode
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Withdrawn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
GB7838505A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB2005422A publication Critical patent/GB2005422A/en
Withdrawn legal-status Critical Current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
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector

Landscapes

  • Electronic Switches (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

The invention relates to contactless electronic switching devices in which a screening electrode protects a response electrode from undesired influences and at the same time does not impair the sensitivity of the switching device. The contactless electronic switching device includes an oscillator 10 susceptible to external influence, an electronic switch controllable by the oscillator and in which the oscillator features an amplifier transistor 15 and a resistive-capacitative feedback circuit 16, a response electrode 17 connected as part of the oscillator, an alteration of capacity between response electrode and earth 18 causing the oscillator 10 to commence or cease to oscillate, and at least one screening electrode 19 surrounding the response electrode 17, the transient alteration of potential difference between response electrode and screening electrode being approximately zero. This is achieved by coupling the electrode 17 to the emitter of amplifier 15 directly or via emitter follower 24. <IMAGE>
GB7838505A 1977-10-05 1978-09-28 Proximity switches Withdrawn GB2005422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2744785A DE2744785B2 (en) 1977-10-05 1977-10-05 Electronic proximity switch

Publications (1)

Publication Number Publication Date
GB2005422A true GB2005422A (en) 1979-04-19

Family

ID=6020716

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7838505A Withdrawn GB2005422A (en) 1977-10-05 1978-09-28 Proximity switches

Country Status (6)

Country Link
JP (1) JPS5461677A (en)
DE (1) DE2744785B2 (en)
FR (1) FR2405594A1 (en)
GB (1) GB2005422A (en)
IT (1) IT1099239B (en)
SE (1) SE7809630L (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191137A2 (en) * 1984-09-22 1986-08-20 Heinrich Jores Capacitive high-sensitivity sensor
WO1989008352A1 (en) * 1988-03-03 1989-09-08 Setec Messgeräte Gesellschaft M.B.H. Capacitive proximity detector
WO1990014604A1 (en) * 1989-05-17 1990-11-29 Moonstone Designs Limited Proximity sensor
GB2250822A (en) * 1989-05-17 1992-06-17 Moonstone Designs Ltd Proximity sensor
GB2279757A (en) * 1990-11-16 1995-01-11 Moonstone Technology Ltd Device for determining the presence and/or characteristics of an object or a substance
GB2265720B (en) * 1990-11-16 1995-06-14 Moonstone Designs Ltd Device for determining the presence and/or characteristics of an object or a substance
US5757196A (en) * 1995-09-28 1998-05-26 Endress + Hauser Gmbh + Co. Capacitive switch actuated by changes in a sensor capacitance
DE20017457U1 (en) 2000-10-11 2001-01-25 DREEFS GmbH Schaltgeräte und Systeme, 96364 Marktrodach Touch sensor
US6486680B1 (en) 2000-06-13 2002-11-26 The North American Manufacturing Company Edge detector
GB2404443A (en) * 2003-07-28 2005-02-02 Automotive Electronics Ltd Ab Capacitive proximity sensor
DE102005041114A1 (en) * 2005-08-30 2007-03-01 BSH Bosch und Siemens Hausgeräte GmbH Capacitive control strip for use in household appliance e.g. hob, has transverse strips that are galvanically isolated from one another, where strips overlap sensor surface in its extension transverse to strip
WO2009018354A1 (en) * 2007-07-31 2009-02-05 Vermeer Manufacturing Company Apparatus and method of capacitively sensing operator presence for a stump cutter
EP2254247A1 (en) * 2009-05-18 2010-11-24 Osram Gesellschaft mit Beschränkter Haftung Sensor circuit
US8257227B2 (en) 2007-07-31 2012-09-04 Vermeer Manufacturing Company Method and apparatus for decelerating a material reduction tool
US10039239B2 (en) 2007-07-31 2018-08-07 Vermeer Manufacturing Company Method and apparatus for controlling the operation of a stump cutter
US10205035B2 (en) 2011-04-01 2019-02-12 Oerlikon Surface Solutions Ag, Pfäffikon Proximity sensor

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3221223A1 (en) * 1982-06-04 1983-12-08 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Capacitive proximity initiator
DE3427498C2 (en) * 1984-07-26 1986-08-07 Ifm Electronic Gmbh, 4300 Essen Electronic, preferably non-contact switching device
DE3544187A1 (en) * 1985-12-13 1987-06-19 Flowtec Ag CAPACITY MEASURING
DE3722334A1 (en) * 1987-07-07 1989-02-09 Ifm Electronic Gmbh ELECTRONIC, CONTACTLESS SWITCHGEAR
DE3722335A1 (en) * 1987-07-07 1989-01-19 Ifm Electronic Gmbh ELECTRONIC, PREFERABLY CONTACTLESS SWITCHGEAR
DE3815698A1 (en) * 1988-05-07 1989-11-16 Balluff Gebhard Feinmech SELF-TESTING, CAPACITIVE PROXIMITY SWITCH
DE3911009A1 (en) * 1989-04-05 1990-10-11 Ifm Electronic Gmbh ELECTRONIC PROXIMITY SWITCH
DE4009697A1 (en) * 1990-03-27 1991-10-02 Fife Gmbh DEVICE FOR CONTACTLESS DETECTION OF THE POSITION OF A MOVING MATERIAL TAPE
DE4111297C1 (en) * 1991-04-08 1992-06-17 Ifm Electronic Gmbh, 4300 Essen, De
DE4023529C3 (en) * 1990-06-11 1995-12-07 Ifm Electronic Gmbh Inductive, capacitive or optical proximity switch
DE4114763C1 (en) * 1991-05-06 1992-11-05 Ifm Electronic Gmbh, 4300 Essen, De
DE4023502A1 (en) * 1990-07-24 1992-02-06 Ifm Electronic Gmbh Electronic switch with e.g. opto-electronic proximity sensor
DE4238992C2 (en) * 1992-11-19 1996-03-21 Ifm Electronic Gmbh Method and device for contactless detection of the approach of a response body
DE19511646C2 (en) * 1995-03-30 1999-01-07 Fife Gmbh Device for contactless detection of the position of a running material band
LU90237B1 (en) * 1998-04-30 1999-11-03 Iee Sarl Capacitive sensor, e.g. for passenger seat monitoring for control of motor vehicle airbag
DE59803939D1 (en) * 1997-11-28 2002-05-29 Iee Sarl CAPACITIVE DISTANCE MEASUREMENT WITH A NON-IDEAL MEASURING ELECTRODE
DE10156580B4 (en) * 2001-11-20 2005-08-11 Sie Sensorik Industrie-Elektronik Gmbh Oscillator circuits for detecting small capacitances or capacitance differences for use in capacitive sensors
US9491699B2 (en) 2011-02-18 2016-11-08 Deutsche Telekom Ag Method for saving energy in operating a first and second mobile communication networks, mobile communication networks
DE102013201704A1 (en) * 2013-02-01 2014-08-07 Di-Soric Gmbh & Co. Kg Capacitive sensor arrangement and capacitive measuring method with compensation of parasitic capacitances

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1436069A (en) * 1965-03-12 1966-04-22 Saxby Proximity sensor
DE1673841C3 (en) * 1968-03-18 1978-04-20 Werner Dipl.-Ing. 6840 Lampertheim Schaller Non-contact capacitive
DE2203039C3 (en) * 1972-01-22 1974-10-10 Robert 7995 Neukirch Buck Electronic, contactless switching device
US3852768A (en) * 1973-08-17 1974-12-03 Ibm Charge detection for ink jet printers

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0191137A3 (en) * 1984-09-22 1987-06-03 Heinrich Jores Capacitive high-sensitivity sensor
EP0191137A2 (en) * 1984-09-22 1986-08-20 Heinrich Jores Capacitive high-sensitivity sensor
WO1989008352A1 (en) * 1988-03-03 1989-09-08 Setec Messgeräte Gesellschaft M.B.H. Capacitive proximity detector
WO1990014604A1 (en) * 1989-05-17 1990-11-29 Moonstone Designs Limited Proximity sensor
GB2250822A (en) * 1989-05-17 1992-06-17 Moonstone Designs Ltd Proximity sensor
GB2250822B (en) * 1989-05-17 1993-08-11 Moonstone Designs Ltd Proximity sensor
GB2279757A (en) * 1990-11-16 1995-01-11 Moonstone Technology Ltd Device for determining the presence and/or characteristics of an object or a substance
GB2279757B (en) * 1990-11-16 1995-06-07 Moonstone Technology Ltd Device for determining the presence and/or characteristics of an object or a substance
GB2265720B (en) * 1990-11-16 1995-06-14 Moonstone Designs Ltd Device for determining the presence and/or characteristics of an object or a substance
US5757196A (en) * 1995-09-28 1998-05-26 Endress + Hauser Gmbh + Co. Capacitive switch actuated by changes in a sensor capacitance
US6486680B1 (en) 2000-06-13 2002-11-26 The North American Manufacturing Company Edge detector
DE20017457U1 (en) 2000-10-11 2001-01-25 DREEFS GmbH Schaltgeräte und Systeme, 96364 Marktrodach Touch sensor
GB2404443A (en) * 2003-07-28 2005-02-02 Automotive Electronics Ltd Ab Capacitive proximity sensor
GB2404443B (en) * 2003-07-28 2007-08-01 Automotive Electronics Ltd Ab Capacitive sensor
DE102005041114A1 (en) * 2005-08-30 2007-03-01 BSH Bosch und Siemens Hausgeräte GmbH Capacitive control strip for use in household appliance e.g. hob, has transverse strips that are galvanically isolated from one another, where strips overlap sensor surface in its extension transverse to strip
WO2009018354A1 (en) * 2007-07-31 2009-02-05 Vermeer Manufacturing Company Apparatus and method of capacitively sensing operator presence for a stump cutter
US7999562B2 (en) 2007-07-31 2011-08-16 Vermeer Manufacturing Company Apparatus and method of capacitively sensing operator presence for a stump cutter
US8257227B2 (en) 2007-07-31 2012-09-04 Vermeer Manufacturing Company Method and apparatus for decelerating a material reduction tool
US10039239B2 (en) 2007-07-31 2018-08-07 Vermeer Manufacturing Company Method and apparatus for controlling the operation of a stump cutter
EP2254247A1 (en) * 2009-05-18 2010-11-24 Osram Gesellschaft mit Beschränkter Haftung Sensor circuit
US10205035B2 (en) 2011-04-01 2019-02-12 Oerlikon Surface Solutions Ag, Pfäffikon Proximity sensor

Also Published As

Publication number Publication date
IT7828446A0 (en) 1978-10-05
IT1099239B (en) 1985-09-18
DE2744785B2 (en) 1981-05-21
JPS5461677A (en) 1979-05-18
SE7809630L (en) 1979-04-06
FR2405594A1 (en) 1979-05-04
DE2744785A1 (en) 1979-04-12

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)