EP0107012A1 - Natte de détecteur - Google Patents

Natte de détecteur Download PDF

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Publication number
EP0107012A1
EP0107012A1 EP83109082A EP83109082A EP0107012A1 EP 0107012 A1 EP0107012 A1 EP 0107012A1 EP 83109082 A EP83109082 A EP 83109082A EP 83109082 A EP83109082 A EP 83109082A EP 0107012 A1 EP0107012 A1 EP 0107012A1
Authority
EP
European Patent Office
Prior art keywords
electrodes
dielectric
strip
spacers
detector mat
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.)
Granted
Application number
EP83109082A
Other languages
German (de)
English (en)
Other versions
EP0107012B1 (fr
Inventor
Herbert Dr. Schewe
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to AT83109082T priority Critical patent/ATE19160T1/de
Publication of EP0107012A1 publication Critical patent/EP0107012A1/fr
Application granted granted Critical
Publication of EP0107012B1 publication Critical patent/EP0107012B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/10—Mechanical actuation by pressure on floors, floor coverings, stair treads, counters, or tills
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/14—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for operation by a part of the human body other than the hand, e.g. by foot
    • H01H3/141—Cushion or mat switches

Definitions

  • the invention relates to a detector mat with electrodes that form at least one pressure-sensitive transducer element with a flat base body.
  • Capacitive-based keys are known in which the compression of a dielectric causes an abrupt change in capacitance, which is converted into pulses with the aid of suitable circuits and supplied to electronics. Such buttons without mechanical contacts have a long service life (Elektronikschau, issue 9, 1980, page 27).
  • a capacitive push button switch is also known, in which a film made of polyvinylidene fluoride PVDF, which is provided as a dielectric, is provided on one flat side with a thin, flexible electrode which is connected to a push button via an intermediate foam layer. On the opposite flat side of the dielectric, two electrical conductors are provided at a predetermined distance, which are arranged side by side on a printed circuit board and form a series connection of capacitors with the dielectric and the common electrode. By actuating the push button, a change in the total capacity is obtained, from which a switching signal is derived (DE-OS 31 14 518).
  • a detector mat with a flat base body is known, on the flat sides of which electrodes are arranged.
  • the basic body consists of: piezoelectric material and its flat sides are provided with the electrodes.
  • the invention has for its object to provide a detector mat that is sensitive to pressure, can be manufactured in a simple manner, is insensitive to interference and has a long life.
  • the capacitance value of the unloaded mat is automatically restored after each load.
  • the capacitance at the load points is determined by the thickness of the dielectric, its dielectric constant and the effective electrode area.
  • the thickness of 10 / um does not substantially exceed in general, and whose relative dielectric constant is about 10 to 15, the capacitance change is more than an order of magnitude and is therefore easily be evaluated electronically.
  • the elasticity and thickness of the spacers is chosen so that the capacities between the electrodes arranged on both flat sides of the dielectric are sufficiently small in the unloaded state at the same time a high sensitivity of the detector mat is achieved.
  • the detector mat forms a sensitive and reliable and therefore versatile security device that can also be used as an alarm device.
  • the electrode strips and the spacers can be arranged on a common base plate.
  • the mechanical stress on the dielectric is relatively low.
  • a thin, areal dielectric made of piezoceramic with a high relative dielectric constant can also be provided. This results in a change in capacity by several orders of magnitude.
  • a particularly simple signal detection with spatial resolution is obtained with an embodiment of the detector mat with row and column electrodes, the crossing points of which each form a transducer element. An AC voltage is applied to these electrodes one after the other in columns and the signals are read out line by line.
  • the spacers can expediently consist of electrically insulating elastomers, which can be strip-shaped or cylindrical or can also be designed as knobs. They can be attached to the base or printed circuit board as well as to a support serving as a cover plate.
  • the electrodes can be at least partially made of metal or also consist of electrically conductive elastomers.
  • FIG. 1 shows a particularly simple embodiment in an exploded sandwich representation.
  • FIG. 2 shows an embodiment with row and column electrodes.
  • FIG. 3 illustrates a top view of the arrangement according to FIG. 2.
  • FIG. 4 shows a modification of the embodiment according to FIG. 3 and
  • FIG. 5 shows a detector mat with knob-shaped spacers.
  • a flat, thin dielectric 2 preferably a film made of polyvinylidene fluoride PVDF with a thickness of approximately 5 to 100 ⁇ m , preferably approximately 10 ⁇ m , in particular a film made of lead zirconate titanate PZT, the thickness of which 100 / um does not significantly exceed and the relative dielectric constant can be up to approximately 4000, provided as the dielectric.
  • a large number of strip electrodes with a predetermined thickness, not shown in the figure, are arranged on their lower flat side, of which only two are shown in the figure and are designated 4 and 5 for simplicity.
  • strip electrodes 4 and 5 consist, at least in their surface area facing the dielectric 2, of electrically conductive material, for example an electrically conductive elastomer, or also of metal. These strip electrodes 4 and 5 are arranged between also strip-shaped spacers 6, 7 and 8 with greater thickness, which are preferably made of elec trisch insulating elastomers exist. The strip electrodes 4 and 5 and the spacers 6 to 8 are arranged in parallel on a base plate 14, which can be made of plastic, for example. On the upper flat side of the double electric 2, a thin, flat electrode 10 made of electrically conductive material is provided, which can be attached to a rigid cover plate 12, for example. The assembly of the cover plate 12 with the electrode 10 can preferably consist of a commercially available copper-clad printed circuit board.
  • the adjacent soft spacers 6, 7 or 8 are pressed together, so that the distance between the strip electrodes 4 or 5 and the electrode 10 is reduced in the loaded surface area.
  • a switching signal is derived from the corresponding change in capacitance and supplied to electronics constructed in a known manner.
  • the electrode 10 is provided with an electrical connecting conductor, not shown in the figure.
  • the strip electrodes 4 and 5 are also connected to a common electrical connecting conductor.
  • a foil made of lead zirconate titanate PZT is provided as dielectric 2, which can be soldered or glued to electrode 10 in a simple manner.
  • dielectric 2 a foil made of lead zirconate titanate PZT is provided as dielectric 2, which can be soldered or glued to electrode 10 in a simple manner.
  • a correspondingly increased output signal is obtained.
  • cylindrical strip electrodes 24 and 25 are provided, which are arranged below the dielectric 2 on the base plate 14. Also provided on the upper flat side of the dielectric 2 are cylindrical spacers 26 and 27 with a greater thickness D, which are made of an electrically insulating elastomer. Furthermore, strip-shaped electrodes are provided above the dielectric 2, of which only the first is visible in the figure and is designated by 28, and are fastened to the common cover 12.
  • the base plate 14 is provided with a planar electrode 34, which can consist, for example, of metal, preferably of copper. Knob-shaped spacers 36 to 38 are provided on this electrode 34, which spacers can be glued, for example, to their metallic base. Above the dielectric 2, strip electrodes 34 and 35 are arranged between the rows of the knob-shaped spacers 36 to 38 and attached to the cover plate 12. In this embodiment, both the base plate 14 with its electrode 34 and the spacers 36 to 38 and the cover plate 12 with its strip electrodes 34 and 35 can each be prefabricated as a structural unit. The knob shape of the spacers 36 to 38 makes the detector mat softer and increases the sensitivity of the arrangement accordingly.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Push-Button Switches (AREA)
  • Measuring Fluid Pressure (AREA)
  • Soil Working Implements (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Burglar Alarm Systems (AREA)
EP83109082A 1982-09-29 1983-09-14 Natte de détecteur Expired EP0107012B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83109082T ATE19160T1 (de) 1982-09-29 1983-09-14 Detektormatte.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3236056 1982-09-29
DE19823236056 DE3236056A1 (de) 1982-09-29 1982-09-29 Detektormatte

Publications (2)

Publication Number Publication Date
EP0107012A1 true EP0107012A1 (fr) 1984-05-02
EP0107012B1 EP0107012B1 (fr) 1986-04-09

Family

ID=6174457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109082A Expired EP0107012B1 (fr) 1982-09-29 1983-09-14 Natte de détecteur

Country Status (3)

Country Link
EP (1) EP0107012B1 (fr)
AT (1) ATE19160T1 (fr)
DE (2) DE3236056A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2623646A1 (fr) * 1987-11-20 1989-05-26 Bollore Protection Detecteur de contact, destine notamment a une protection perimetrique ou peripherique
WO1990010920A1 (fr) * 1989-03-11 1990-09-20 Herbert Valdemar Lewin Systeme et appareil de controle
DE19639207A1 (de) * 1996-09-24 1998-04-09 Bircher Ag Geber für einen elektrischen Schaltkreis
CH691151A5 (fr) * 1994-06-09 2001-04-30 Edouard Menoud Dispositif de surveillance et d'alerte de la présence de corps en danger dans une piscine.
ES2255853A1 (es) * 2004-12-20 2006-07-01 Asociacion De Investigacion De La Industria Textil Alfombra con detector de presencia.
WO2008135040A2 (fr) 2007-05-08 2008-11-13 Universität Karlsruhe (Th) Dispositif de détection

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3418588A1 (de) * 1984-05-18 1985-11-21 Hörmann KG Antriebs- und Steuerungstechnik, 4834 Harsewinkel Signalgebergeraet fuer die wandlung einer druckverformung in ein elektrisches signal
DE4103911A1 (de) * 1991-02-08 1992-08-13 Schoeller Philipp A Weckeinrichtung
DE10248761B4 (de) 2002-10-18 2013-10-02 Wilhelm Karmann Gmbh Kapazitiv messender Sensor und Detektionseinrichtung mit einer kapazitiven Sensorik zum Detektieren einer Einklemmsituation
DE102013002964B4 (de) * 2013-02-22 2020-06-25 Thomas Sefrin Hebevorrichtung für ein Flugzeug
US11124390B2 (en) 2018-05-22 2021-09-21 Otis Elevator Company Pressure sensitive mat

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748443A (en) * 1971-07-01 1973-07-24 S Kroll Wheel sensing apparatus
FR2391519A1 (fr) * 1977-05-16 1978-12-15 App Automatiques Ste Fse Dispositif de discrimination de presence
DE3033858A1 (de) * 1979-11-20 1981-05-27 Sandstone, Inc., La Miranda, Calif. Sensorelement
DE2834863B2 (de) * 1978-08-09 1981-07-16 Fa. Carl Freudenberg, 6940 Weinheim Alarm- oder Diebstahlssicherung
DE3114518A1 (de) * 1980-04-16 1982-03-11 Alps Electric Co., Ltd., Tokyo Druckknopfschalter mit variabler kapazitaet
EP0064240A2 (fr) * 1981-04-29 1982-11-10 Honeywell Inc. Plaguette à circuit capacitif et procédé pour sa fabrication
DE3231533A1 (de) * 1981-08-28 1983-04-07 Illinois Tool Works Kapazitiver tastenschalter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748443A (en) * 1971-07-01 1973-07-24 S Kroll Wheel sensing apparatus
FR2391519A1 (fr) * 1977-05-16 1978-12-15 App Automatiques Ste Fse Dispositif de discrimination de presence
DE2834863B2 (de) * 1978-08-09 1981-07-16 Fa. Carl Freudenberg, 6940 Weinheim Alarm- oder Diebstahlssicherung
DE3033858A1 (de) * 1979-11-20 1981-05-27 Sandstone, Inc., La Miranda, Calif. Sensorelement
DE3114518A1 (de) * 1980-04-16 1982-03-11 Alps Electric Co., Ltd., Tokyo Druckknopfschalter mit variabler kapazitaet
EP0064240A2 (fr) * 1981-04-29 1982-11-10 Honeywell Inc. Plaguette à circuit capacitif et procédé pour sa fabrication
DE3231533A1 (de) * 1981-08-28 1983-04-07 Illinois Tool Works Kapazitiver tastenschalter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELEKTRONIKSCHAU, 56. Jahrgang,Heft 9, 1980, Technischer Verlag Erb Ges.m.b.H., Wien F. MADERBACHER "Alphanumerische Tastaturen" Seiten 26-28,30,32 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2623646A1 (fr) * 1987-11-20 1989-05-26 Bollore Protection Detecteur de contact, destine notamment a une protection perimetrique ou peripherique
WO1990010920A1 (fr) * 1989-03-11 1990-09-20 Herbert Valdemar Lewin Systeme et appareil de controle
CH691151A5 (fr) * 1994-06-09 2001-04-30 Edouard Menoud Dispositif de surveillance et d'alerte de la présence de corps en danger dans une piscine.
DE19639207A1 (de) * 1996-09-24 1998-04-09 Bircher Ag Geber für einen elektrischen Schaltkreis
ES2255853A1 (es) * 2004-12-20 2006-07-01 Asociacion De Investigacion De La Industria Textil Alfombra con detector de presencia.
ES2255853B2 (es) * 2004-12-20 2007-08-01 Asociacion De Investigacion De La Industria Textil Alfombra con detector de presencia.
WO2008135040A2 (fr) 2007-05-08 2008-11-13 Universität Karlsruhe (Th) Dispositif de détection
WO2008135040A3 (fr) * 2007-05-08 2009-02-26 Univ Karlsruhe Dispositif de détection
US20110037483A1 (en) * 2007-05-08 2011-02-17 Karlsruher Institut Fuer Technologie Mess-sensor

Also Published As

Publication number Publication date
EP0107012B1 (fr) 1986-04-09
ATE19160T1 (de) 1986-04-15
DE3362933D1 (en) 1986-05-15
DE3236056A1 (de) 1984-03-29

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