WO1997047976A3 - Device for detection of the presence of an electrically conducting object - Google Patents

Device for detection of the presence of an electrically conducting object Download PDF

Info

Publication number
WO1997047976A3
WO1997047976A3 PCT/SE1997/000920 SE9700920W WO9747976A3 WO 1997047976 A3 WO1997047976 A3 WO 1997047976A3 SE 9700920 W SE9700920 W SE 9700920W WO 9747976 A3 WO9747976 A3 WO 9747976A3
Authority
WO
WIPO (PCT)
Prior art keywords
sensor element
detecting
capacitive
electrically conducting
area
Prior art date
Application number
PCT/SE1997/000920
Other languages
French (fr)
Other versions
WO1997047976A2 (en
Inventor
Bengt-Allan Bergvall
Tommy Fristedt
Original Assignee
Scandmec Ab
Bergvall Bengt Allan
Tommy Fristedt
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 Scandmec Ab, Bergvall Bengt Allan, Tommy Fristedt filed Critical Scandmec Ab
Priority to AU31117/97A priority Critical patent/AU3111797A/en
Publication of WO1997047976A2 publication Critical patent/WO1997047976A2/en
Publication of WO1997047976A3 publication Critical patent/WO1997047976A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/01532—Passenger detection systems using field detection presence sensors using electric or capacitive field sensors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/9607—Capacitive touch switches
    • H03K2217/960755—Constructional details of capacitive touch and proximity switches
    • H03K2217/960765—Details of shielding arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Mechanical Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The invention relates to a device for detecting the presence of an electrically conducting object (7) in a predetermined detection area, comprising a capacitive sensor element (3), a second capacitive element arranged in connection to said sensor element (3), and means (9, 10) for detecting the variation in capacitance between the sensor element (3) and the object (7) caused by either present object (7) or absent object (7) by detecting a variation in potential of the sensor element (3). The invention is characterized in that the capacitive elements (3, 4) are of an essentially two-dimensional extension, with said second capacitive element having an area which exceeds the area of the sensor element (3), and with the size of said detection area being in relation to the difference in plate areas. By means of the invention, an improved device is provided for detecting presence, e.g. the presence of a person in a seat (1) in a vehicle.
PCT/SE1997/000920 1996-05-31 1997-05-29 Device for detection of the presence of an electrically conducting object WO1997047976A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU31117/97A AU3111797A (en) 1996-05-31 1997-05-29 Device for detection of the presence of an electrically conducting object

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9602176A SE9602176D0 (en) 1996-05-31 1996-05-31 Device for sensing the presence of an electrically conductive object
SE9602176-1 1996-05-31

Publications (2)

Publication Number Publication Date
WO1997047976A2 WO1997047976A2 (en) 1997-12-18
WO1997047976A3 true WO1997047976A3 (en) 1998-02-26

Family

ID=20402847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000920 WO1997047976A2 (en) 1996-05-31 1997-05-29 Device for detection of the presence of an electrically conducting object

Country Status (3)

Country Link
AU (1) AU3111797A (en)
SE (1) SE9602176D0 (en)
WO (1) WO1997047976A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812626A1 (en) * 1998-03-23 1999-09-30 Bayerische Motoren Werke Ag Capacitive object detection method for vehicles
EP1078341A4 (en) * 1999-03-05 2010-01-06 Tk Holdings Inc Proximity sensor
US6445294B1 (en) * 1999-07-15 2002-09-03 Automotive Systems Laboratory, Inc. Proximity sensor
FR2826723B1 (en) * 2001-06-28 2004-01-30 Hitachi Comp Products Europ Sa CAPACITIVE MEASUREMENT SYSTEM
WO2013172820A1 (en) 2012-05-15 2013-11-21 Thomson Licensing Capacitive touch button with guard
NZ722329A (en) 2014-01-29 2020-05-29 Roho Inc Cushion immersion sensor
LU92732B1 (en) * 2015-06-05 2016-12-06 Iee Int Electronics & Eng Sa Capacitive detection device and system for use in vehicle interior
JP7085117B2 (en) * 2018-03-23 2022-06-16 Toto株式会社 Toilet seat device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764861A (en) * 1972-07-31 1973-10-09 Chrysler Corp Electronic seat sensing switch
US3943376A (en) * 1973-10-23 1976-03-09 Fairchild Camera And Instrument Corporation Occupancy detector apparatus for automotive safety systems
US4191894A (en) * 1976-11-18 1980-03-04 Mitsubishi Denki Kabushiki Kaisha Proximity detector
GB2279750A (en) * 1993-07-10 1995-01-11 Paul Thomas Ryan Capacitive proximity sensor
US5442347A (en) * 1993-01-25 1995-08-15 The United States Of America As Represented By The Administrater, National Aeronautics & Space Administration Double-driven shield capacitive type proximity sensor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764861A (en) * 1972-07-31 1973-10-09 Chrysler Corp Electronic seat sensing switch
US3943376A (en) * 1973-10-23 1976-03-09 Fairchild Camera And Instrument Corporation Occupancy detector apparatus for automotive safety systems
US4191894A (en) * 1976-11-18 1980-03-04 Mitsubishi Denki Kabushiki Kaisha Proximity detector
US5442347A (en) * 1993-01-25 1995-08-15 The United States Of America As Represented By The Administrater, National Aeronautics & Space Administration Double-driven shield capacitive type proximity sensor
GB2279750A (en) * 1993-07-10 1995-01-11 Paul Thomas Ryan Capacitive proximity sensor

Also Published As

Publication number Publication date
AU3111797A (en) 1998-01-07
SE9602176D0 (en) 1996-05-31
WO1997047976A2 (en) 1997-12-18

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