SE9603988L - Presence sensing device - Google Patents

Presence sensing device

Info

Publication number
SE9603988L
SE9603988L SE9603988A SE9603988A SE9603988L SE 9603988 L SE9603988 L SE 9603988L SE 9603988 A SE9603988 A SE 9603988A SE 9603988 A SE9603988 A SE 9603988A SE 9603988 L SE9603988 L SE 9603988L
Authority
SE
Sweden
Prior art keywords
detection
conducting layers
sensor element
arrangement
arises
Prior art date
Application number
SE9603988A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE518888C2 (en
SE9603988D0 (en
Inventor
Bengt-Allan Bergvall
Original Assignee
Scandmec Ab
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 filed Critical Scandmec Ab
Priority to SE9603988A priority Critical patent/SE518888C2/en
Publication of SE9603988D0 publication Critical patent/SE9603988D0/en
Priority to PCT/SE1997/001821 priority patent/WO1998022836A1/en
Publication of SE9603988L publication Critical patent/SE9603988L/en
Publication of SE518888C2 publication Critical patent/SE518888C2/en

Links

Classifications

    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
    • G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
    • G01L1/144—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors with associated circuitry
    • 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

Abstract

The present invention relates to an arrangement for presence detection of an object in a predetermined area (11), said arrangement comprising at least one capacitive sensor element (1) comprising a number of electrically conducting layers (2, 4, 6) which have an essentially two-dimensional extension and which are arranged at a distance from each other, wherein the relative distance between at least two of the conducting layers will reduce during the influence of force, by means of which the capacitance of said sensor element (1) will change, and a detection unit (14) for detection of the difference between the capacitance that, on the one hand, arises when the object is present and, on the other hand, arises when the object is absent. The invention is characterized in that the electrically conducting layers (2, 4, 6) are arranged in such a way that at least two (2, 6) of the layers are essentially surrounding at least one further layer (4). Preferably, the invention comprises at least one resilient device (7, 8), which is constructed in such a way that at least two of the conducting layers (2, 4, 6) will reduce their relative distance when the sensor element (1) is exposed to the influence of force. By means of the invention, an improved arrangement for presence detection is provided, in particular for detection of the presence of an individual in a vehicle seat.
SE9603988A 1996-11-01 1996-11-01 Presence sensing device and vehicle seat comprising the device SE518888C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9603988A SE518888C2 (en) 1996-11-01 1996-11-01 Presence sensing device and vehicle seat comprising the device
PCT/SE1997/001821 WO1998022836A1 (en) 1996-11-01 1997-10-31 Device for presence detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9603988A SE518888C2 (en) 1996-11-01 1996-11-01 Presence sensing device and vehicle seat comprising the device

Publications (3)

Publication Number Publication Date
SE9603988D0 SE9603988D0 (en) 1996-11-01
SE9603988L true SE9603988L (en) 1998-05-02
SE518888C2 SE518888C2 (en) 2002-12-03

Family

ID=20404448

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9603988A SE518888C2 (en) 1996-11-01 1996-11-01 Presence sensing device and vehicle seat comprising the device

Country Status (2)

Country Link
SE (1) SE518888C2 (en)
WO (1) WO1998022836A1 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9919975D0 (en) * 1999-08-24 1999-10-27 Philipp Harald Seat occupancy sensor for vehicular use
DE10010532A1 (en) * 2000-03-03 2001-09-13 Bayerische Motoren Werke Ag Capacitive object recognition for vehicle seats involves assessing time variations of capacitances in seat back or base, and if both assessments agree occupant protection device is activated
DE10010531A1 (en) * 2000-03-03 2001-09-13 Bayerische Motoren Werke Ag Capacitive object detection method for vehicles
US6499359B1 (en) * 2001-07-09 2002-12-31 Nartron Corporation Compressible capacitance sensor for determining the presence of an object
EP1447653A4 (en) * 2001-10-22 2006-05-03 Microjenics Inc Pressure-sensitive sensor and monitor using the pressure-sensitive sensor
JP4141426B2 (en) * 2004-03-29 2008-08-27 三洋電機株式会社 Capacitive pressure sensor and heart rate / respiration measurement device using the same
US7395717B2 (en) * 2006-02-10 2008-07-08 Milliken & Company Flexible capacitive sensor
US7208960B1 (en) 2006-02-10 2007-04-24 Milliken & Company Printed capacitive sensor
US7301351B2 (en) 2006-02-10 2007-11-27 Milliken & Company Printed capacitive sensor
US20080277910A1 (en) * 2007-05-10 2008-11-13 Tk Holdings Inc. Vehicle seat including sensor
US7719007B2 (en) 2008-04-30 2010-05-18 Milliken & Company Flexible electroluminescent capacitive sensor
ATE523387T1 (en) 2008-05-29 2011-09-15 Delphi Tech Inc SEAT BELT WARNING SYSTEM
NL2001822C2 (en) * 2008-07-17 2010-01-19 2M Engineering Ltd Force sensor and corresponding force monitoring mattress.
DE102009055424A1 (en) * 2009-12-30 2011-07-07 Takata-Petri Ag, 63743 Capacitive sensor module
DE102009055426A1 (en) * 2009-12-30 2011-07-07 Takata-Petri Ag, 63743 Capacitive sensor module
CN102607747A (en) * 2012-03-04 2012-07-25 江南大学 Disk target beating sensor
JP5621878B2 (en) * 2013-05-10 2014-11-12 ヤマハ株式会社 Pressure sensor and data input device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2163814A5 (en) * 1971-12-02 1973-07-27 Luton Michel
US3875481A (en) * 1973-10-10 1975-04-01 Uniroyal Inc Capacitive weighing mat
EP0357225B1 (en) * 1988-07-29 1993-12-15 Mazda Motor Corporation Air bag system for automobile

Also Published As

Publication number Publication date
SE518888C2 (en) 2002-12-03
WO1998022836A1 (en) 1998-05-28
SE9603988D0 (en) 1996-11-01

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Legal Events

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