DE10021501C1 - Fingertip sensor for capacitive detection of fingerprint activated by evaluating potential drop across component inserted in protection line - Google Patents

Fingertip sensor for capacitive detection of fingerprint activated by evaluating potential drop across component inserted in protection line

Info

Publication number
DE10021501C1
DE10021501C1 DE2000121501 DE10021501A DE10021501C1 DE 10021501 C1 DE10021501 C1 DE 10021501C1 DE 2000121501 DE2000121501 DE 2000121501 DE 10021501 A DE10021501 A DE 10021501A DE 10021501 C1 DE10021501 C1 DE 10021501C1
Authority
DE
Germany
Prior art keywords
fingertip sensor
potential drop
sensor
protection line
fingertip
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.)
Expired - Fee Related
Application number
DE2000121501
Other languages
German (de)
Inventor
Thomas Szelestey
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.)
Gigaset Communications GmbH
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Priority to DE2000121501 priority Critical patent/DE10021501C1/en
Application granted granted Critical
Publication of DE10021501C1 publication Critical patent/DE10021501C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches

Landscapes

  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

The fingertip sensor (FS) has a protection grid (SG) coupled to a reference potential (0V) via a protection line (SL), which incorporates a component across which a potential drop is obtained, with measurement of the latter via an evaluation stage (AS), for activation of the fingertip sensor.

Description

Die Erfindung betrifft einen Fingertip-Sensor gemäß dem Ober­ begriff des Patentanspruchs 1.The invention relates to a fingertip sensor according to the waiter Concept of claim 1.

Ein solcher Fingertip-Sensor beziehungsweise Fingerlinien- Sensor dient beispielsweise zur kapazitiven Erfassung von Fingerlinien. Solche Sensoren sind unter anderem als Module erhältlich und sie werden zur Zugangskontrolle, insbesondere bei Endgeräten der Kommunikationstechnik oder der Datenverar­ beitungstechnik, eingesetzt.Such a fingertip sensor or finger line Sensor is used, for example, for capacitive detection of Finger lines. Such sensors are among other things as modules available and they will be used for access control, in particular for end devices in communication technology or data processing processing technology, used.

Zur Aktivierung beziehungsweise zur Auslösung der Erfassung ist beispielsweise unter dem Fingertip-Sensor eine mechani­ sche Taste angeordnet. Diese Kombination hat unangenehme tak­ tile Eigenschaften. Ein permanenter Scan- beziehungsweise Ab­ tastvorgang führt zur Abnutzung des Sensors und reduziert dessen Haltbarkeit. Weiter erhöht dieses Verfahren nicht un­ erheblich den Stromverbrauch.To activate or trigger the detection is, for example, a mechanical under the fingertip sensor arranged button. This combination has uncomfortable tak tile properties. A permanent scan or Ab Sensing leads to wear of the sensor and reduces its durability. Furthermore, this process does not increase un significantly the power consumption.

Aus der DE 23 53 786 A1 ist ein elektronischer Schalter be­ kannt, bei dem durch Berührung einer Berührungsplatte eine Schaltfunktion ausgelöst wird. Hierzu ist die Berührungsplat­ te, die einen Übergangswiderstand aufweist, einerseits mit einer Netzphase und andrerseits mit Erde verbunden.From DE 23 53 786 A1 an electronic switch is be knows in which by touching a touch plate Switching function is triggered. For this is the touch plate te, which has a contact resistance, on the one hand with a network phase and on the other hand connected to earth.

Aus der DE 198 36 770 C1 ist ein Verfahren zur kapazitiven Bilderfassung mit einer rasterförmigen Anordnung von Leiter­ flächen bekannt.DE 198 36 770 C1 describes a capacitive method Image acquisition with a grid arrangement of conductors known areas.

Der Erfindung liegt die Aufgabe zugrunde, einen Fingertip- Sensor anzugeben, der auf einfache Art und Weise vom Benutzer aktivierbar ist.The invention has for its object a fingertip Specify the sensor in a simple way by the user can be activated.

Diese Aufgabe wird erfindungsgemäß durch die im Patentan­ spruch 1 angegebenen Merkmale gelöst.This object is achieved by the in patent claim 1 specified features solved.

Bekannte Fingertip-Sensoren sind mit einem feinen metalli­ schen Gitter versehen, um die elektrostatische Aufladung ei­ nes Benutzers abzuleiten. Dieses Gitter ist über einen eige­ nen Anschlusspin auf der Sensorschnittstelle herausgeführt, und wird üblicherweise direkt mit der Gehäusemasse oder einem Bezugspotential verbunden. Erfindungsgemäß wird diese An­ schlussleitung derart modifiziert, so dass bei einer Berüh­ rung des Gitters durch einen Benutzer ein auf dieser Leitung fließender Strom zur Aktivierung des Sensors selbst ausge­ nutzt wird.Known fingertip sensors are with a fine metallic provided grid to the electrostatic charge derive a user. This grid is over an own a connection pin on the sensor interface, and is usually directly with the housing mass or a Reference potential connected. According to the invention end line modified in such a way that at a contact a user on this line  flowing current to activate the sensor itself out is used.

Im Folgenden wird die Erfindung anhand eines Ausführungsbei­ spieles beschrieben.In the following, the invention is illustrated by means of an embodiment game described.

In der einzigen Figur ist ein Fingertip-Sensor FS darge­ stellt, der ein symbolisch dargestelltes Schutzgitter SG auf­ weist. Dieses Schutzgitter SG ist über eine Schutzleitung SL mit einem Bezugspotential 0 V verbunden.In the single figure, a fingertip sensor FS is shown sets up a symbolically represented protective grille SG has. This protective grille SG is via a protective line SL connected to a reference potential 0 V.

Erfindungsgemäß sind in diese Schutzleitung SL zwei anti­ parallel geschaltete Dioden D1 und D2 eingefügt. Ein an den Dioden D1 und D2 auftretender Spannungsabfall wird über einen Widerstand R an eine Auswertestufe AS gegeben. Die Auswer­ testufe AS ist über eine Aktivierungsleitung AL mit dem Fin­ gertip-Sensor FS verbunden.According to the invention, two anti are in this protective line SL Diodes D1 and D2 connected in parallel are inserted. One to the Diodes D1 and D2 occurring voltage drop is over a Resistor R is given to an evaluation stage AS. The Auswer test level AS is connected to the fin gertip sensor FS connected.

Bei einer Berührung des Schutzgitters SG durch einen Benutzer fließt ein Strom über die Schutzleitung SL zum Bezugspotenti­ al 0 V. Der von der Auswertestufe AS detektierte Spannungsab­ fall bewirkt, dass über die Auswertestufe AS selbst oder über ein angesteuertes Relais der Fingertip-Sensor FS eingeschal­ tet und damit aktiviert wird.When the protective grille SG is touched by a user a current flows through the protective line SL to the reference potential al 0 V. The voltage ab detected by the evaluation stage AS case causes that via the evaluation level AS itself or via a controlled relay of the fingertip sensor FS is switched on tet and thus activated.

Anstelle der beiden Dioden D1 und D2 kann auch ein Widerstand vorgesehen sein. Zur Detektion des Spannungsabfalles kann im Prinzip auch eine Spule verwendet werden. Die die Schutzlei­ tung SL umschliesst.A resistor can also be used instead of the two diodes D1 and D2 be provided. To detect the voltage drop in the Principle, a coil can also be used. The protective guards tung SL encloses.

Claims (2)

1. Fingertip-Sensor (FS) mit einem Schutzgitter (SG), das über eine Schutzleitung (SL) an ein Bezugspotential (0 V) an­ geschaltet ist, dadurch gekennzeichnet, dass
in die Schutzleitung (SL) ein, einen Spannungsabfall bewir­ kendes Bauelement eingefügt ist, und
dieser Spannungsabfall einer Auswertestufe (AS) zugeführt ist, über die der Fingertip-Sensor (FS) aktivierbar ist.1. fingertip sensor (FS) with a protective grid (SG), which is connected to a reference potential (0 V) via a protective line (SL), characterized in that
in the protective line (SL), a voltage drop causing component is inserted, and
this voltage drop is fed to an evaluation stage (AS) via which the fingertip sensor (FS) can be activated. 2. Fingertip-Sensor nach Anspruch 1, dadurch gekennzeichnet, dass das Bauelement antiparallel geschaltete Dioden (D1, D2) auf­ weist.2. fingertip sensor according to claim 1, characterized in that the component antiparallel connected diodes (D1, D2) has.
DE2000121501 2000-05-03 2000-05-03 Fingertip sensor for capacitive detection of fingerprint activated by evaluating potential drop across component inserted in protection line Expired - Fee Related DE10021501C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2000121501 DE10021501C1 (en) 2000-05-03 2000-05-03 Fingertip sensor for capacitive detection of fingerprint activated by evaluating potential drop across component inserted in protection line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2000121501 DE10021501C1 (en) 2000-05-03 2000-05-03 Fingertip sensor for capacitive detection of fingerprint activated by evaluating potential drop across component inserted in protection line

Publications (1)

Publication Number Publication Date
DE10021501C1 true DE10021501C1 (en) 2001-10-31

Family

ID=7640620

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2000121501 Expired - Fee Related DE10021501C1 (en) 2000-05-03 2000-05-03 Fingertip sensor for capacitive detection of fingerprint activated by evaluating potential drop across component inserted in protection line

Country Status (1)

Country Link
DE (1) DE10021501C1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7583826B2 (en) 2002-07-31 2009-09-01 Casio Computer Co., Ltd. Image reading apparatus and its driving method
CN102569289A (en) * 2010-12-23 2012-07-11 中芯国际集成电路制造(上海)有限公司 Structure and method for eliminating process antenna effect

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353786A1 (en) * 1973-10-26 1975-05-07 Insta Elektro Gmbh & Co Kg Electronic key interchangeable with mechanical keys - switches a load supplied from the mains through a stepping down transformer
DE19836770C1 (en) * 1998-08-13 2000-04-20 Siemens Ag Capacitive image capture method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353786A1 (en) * 1973-10-26 1975-05-07 Insta Elektro Gmbh & Co Kg Electronic key interchangeable with mechanical keys - switches a load supplied from the mains through a stepping down transformer
DE19836770C1 (en) * 1998-08-13 2000-04-20 Siemens Ag Capacitive image capture method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7583826B2 (en) 2002-07-31 2009-09-01 Casio Computer Co., Ltd. Image reading apparatus and its driving method
CN102569289A (en) * 2010-12-23 2012-07-11 中芯国际集成电路制造(上海)有限公司 Structure and method for eliminating process antenna effect

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Legal Events

Date Code Title Description
8100 Publication of the examined application without publication of unexamined application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: GIGASET COMMUNICATIONS GMBH, 81379 MUENCHEN, DE

R081 Change of applicant/patentee

Owner name: GIGASET COMMUNICATIONS GMBH, DE

Free format text: FORMER OWNER: GIGASET COMMUNICATIONS GMBH, 81379 MUENCHEN, DE

R082 Change of representative

Representative=s name: MICHALSKI HUETTERMANN & PARTNER PATENTANWAELTE, DE

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee