GB2005422A - Proximity switches - Google Patents
Proximity switchesInfo
- 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- Withdrawn
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>
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)
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)
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)
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 |
-
1977
- 1977-10-05 DE DE2744785A patent/DE2744785B2/en not_active Ceased
-
1978
- 1978-09-13 SE SE7809630A patent/SE7809630L/en unknown
- 1978-09-27 FR FR7827641A patent/FR2405594A1/en not_active Withdrawn
- 1978-09-28 GB GB7838505A patent/GB2005422A/en not_active Withdrawn
- 1978-10-04 JP JP12162278A patent/JPS5461677A/en active Pending
- 1978-10-05 IT IT28446/78A patent/IT1099239B/en active
Cited By (21)
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) |