EP0888632A1 - Ultrasound keyboard protection arrangement - Google Patents

Ultrasound keyboard protection arrangement

Info

Publication number
EP0888632A1
EP0888632A1 EP97903263A EP97903263A EP0888632A1 EP 0888632 A1 EP0888632 A1 EP 0888632A1 EP 97903263 A EP97903263 A EP 97903263A EP 97903263 A EP97903263 A EP 97903263A EP 0888632 A1 EP0888632 A1 EP 0888632A1
Authority
EP
European Patent Office
Prior art keywords
sound
keyboard
signal
receiver
sound generator
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
EP97903263A
Other languages
German (de)
French (fr)
Other versions
EP0888632B1 (en
Inventor
Johannes Schulte
Oliver Liedtke
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.)
Wincor Nixdorf International GmbH
Original Assignee
Wincor Nixdorf International GmbH
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 Wincor Nixdorf International GmbH filed Critical Wincor Nixdorf International GmbH
Publication of EP0888632A1 publication Critical patent/EP0888632A1/en
Application granted granted Critical
Publication of EP0888632B1 publication Critical patent/EP0888632B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
    • G07F19/20—Automatic teller machines [ATMs]
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F19/00—Complete banking systems; Coded card-freed arrangements adapted for dispensing or receiving monies or the like and posting such transactions to existing accounts, e.g. automatic teller machines
    • G07F19/20—Automatic teller machines [ATMs]
    • G07F19/205—Housing aspects of ATMs
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07F—COIN-FREED OR LIKE APPARATUS
    • G07F7/00—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • G07F7/10—Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means together with a coded signal, e.g. in the form of personal identification information, like personal identification number [PIN] or biometric data
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07G—REGISTERING THE RECEIPT OF CASH, VALUABLES, OR TOKENS
    • G07G3/00—Alarm indicators, e.g. bells
    • G07G3/003—Anti-theft control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/038—Anti-vandalism

Definitions

  • the invention relates to the detection of an object covering the surface of a keyboard.
  • Self-service devices generally have a keyboard on which the user enters confidential or secret data, in particular a secret number called a PIN (Personal Identification Number).
  • a keyboard can be manipulated using similar keyboards or other objects.
  • a device that detects such manipulation must, however, be inconspicuous, robust and secured against willful damage (vandalism).
  • the invention solves the problem by means of a sound transducer mounted inside the keyboard, which preferably emits ultrasonic waves through the surface of the keyboard without the surface being visibly changed.
  • the protective device is thus inconspicuous and continues to be protected against vandalism. Since the keyboard is protected against inspection by a hood anyway, a receiver can be attached above the keyboard, which detects the emitted ultrasound waves and accordingly reports a proper condition. Show it:
  • FIG. 1 shows an arrangement of a keyboard with ultrasound transmitter and receiver
  • FIG. 2 shows a possible attachment of an ultrasound transmitter in the frame of a keyboard.
  • a keyboard on base plate 10 under a hood 13 is shown in a highly simplified and schematic manner in FIG. 1.
  • the keyboard consists of a key frame 11 and individual keys 12a..d.
  • an ultrasonic transmitter 14 is attached to a web between the keys 12a..d, which is electrically excited.
  • An ultrasound receiver 15 is attached above the keyboard, in the example in the hood 13 protecting the keyboard. The signal it receives is amplified, rectified and fed to a threshold detector.
  • the output of the threshold detector is connected to a control unit for the device using the keyboard as an input device. As long as the threshold value detector reports the presence of a signal to the control unit, the device remains ready for use and uses the keyboard as an input device.
  • the threshold value detector therefore changes its signal to the control unit, which reacts accordingly. If the device is in the ready state, loss of ultrasound transmission, reported by the threshold value detector, is interpreted as manipulation and the device is put into a fault state. This does not apply when a user is prompted to enter data because the weakening can come from the user's hand. The device is thus protected in that the threshold value detector must report the presence of a signal before the start of each transaction by an operator of the keyboard.
  • the ultrasound transmitter is preferably attached to the keyboard on the inner surface of a key or a key frame.
  • the material is acoustically thin enough so that an easily detectable signal is emitted from the keyboard without further measures, without the presence of the ultrasound transmitter becoming visible. Since the surface of the keyboard is undisturbed, it cannot be easily recognized where the signal is emitted, so that attempts at manipulation are more difficult.
  • a blind hole is let into the inside of a web of the key frame 11, as shown in FIG. 2, so that the ultrasonic waves can escape through the remaining material. Since it is a blind hole, the surface remains unchanged.
  • a piezoceramic plate is inserted and glued into the blind hole as an ultrasound transmitter, which is provided in a known manner with electrical contacts and connections which are connected to an alternating voltage source with a suitable frequency. This creates an ultrasound-radiating transducer that is not visible from the outside and cannot be manipulated.
  • a key in particular a blind key, can also be used. This is advantageous if the webs between the keys are very narrow. If the ultrasound radiation is in the low-frequency range, a spherical radiation occurs, so that the receiver cannot be attached directly above the keyboard, but even laterally.
  • Piezo or electrodynamic-based loudspeakers are also available, which radiate not only in the audible but also in the ultrasound range.
  • a simple variant of the invention therefore consists in mounting one below the keyboard so that the sound radiation passes through the slots between the keys and the key frame. An acoustic coupling with a key or the key frame is not necessary.
  • Electret microphones can also be used as receivers, the frequency range of which usually extends into the ultrasound range.
  • Another variant of the invention uses a reflector instead of the ultrasound receiver. Due to the duration of the signal, the transmitter can be used in the manner of an echo sounder to emit short signals and then serve as a receiver in a transmission pause. Instead of this, a second ultrasonic transducer can also be installed in the keyboard as the receiver, so that the transmitter and receiver are separated. It is also possible to swap the role of the encoder and receiver statically or dynamically.
  • the excitation signal can also be modulated and the phase position of the modulation can be determined. Manipulations can thus be prevented which pick up a signal and emit it again through a similar transmitter, which will generally lead to a phase shift or change in transit time and thus be recognized. A pseudo noise is very useful as modulation because it cannot be simulated easily. The then necessary correlation analysis can be carried out by a signal processor.
  • the sender and receiver can also be swapped for audible signals.
  • An electromagnetic tongue in the manner of a buzzer can also serve as the transmitter, which strikes the key frame, for example, and thus sets it in vibration, which is emitted by the key frame.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

The invention concerns an arrangement for detecting an object covering the surface of a keyboard. The keyboard contains a sound source which emits a signal into the space above the keyboard surface. A sound receiver is disposed opposite the keyboard in the emission region of the sound source such that an object covering the sound source weakens the signal arriving at the sound receiver. The sound receiver is connected via an evaluation circuit to a control device which can block the keyboard or an apparatus containing the keyboard.

Description

Ultraschall-Tastaturschutz Ultrasound keyboard protection
Die Erfindung betrifft die Erkennung eines die Oberfläche einer Tastatur bedeckenden Gegenstands.The invention relates to the detection of an object covering the surface of a keyboard.
Selbstbedienungsgeräte haben in der Regel eine Tastatur, auf der der Benutzer vertrauliche oder geheime Daten ein¬ gibt, insbesondere eine als PIN (Personal Identification Number) bezeichnete Geheimzahl. Um diese und ähnliche Daten unrechtmäßig zu gewinnen, kann eine Tastatur durch aufge¬ legte ähnliche Tastaturen oder andere Gegenstände manipu¬ liert werden. Eine Einrichtung, die solche Manipulationen entdeckt, muß jedoch gleichzeitig unauffällig, robust und gegen mutwillige Beschädigung (Vandalismus) gesichert sein.Self-service devices generally have a keyboard on which the user enters confidential or secret data, in particular a secret number called a PIN (Personal Identification Number). In order to illegally obtain this and similar data, a keyboard can be manipulated using similar keyboards or other objects. A device that detects such manipulation must, however, be inconspicuous, robust and secured against willful damage (vandalism).
Es ist daher Aufgabe der Erfindung, eine entsprechende Ein¬ richtung anzugeben.It is therefore an object of the invention to provide a corresponding device.
Die Erfindung löst die Aufgabe durch einen im Inneren der Tastatur angebrachten Schallwandler, der durch die Oberflä¬ che der Tastatur vorzugsweise Ultraschallwellen abstrahlt, ohne daß die Oberfläche sichtbar verändert ist. Die Schutz¬ einrichtung ist damit unauffällig und weiterhin gegen Van¬ dalismus geschüzt. Da die Tastatur ohnehin gegen Einsicht¬ nahme durch eine Haube geschützt ist, kann oberhalb der Ta¬ statur ein Empfänger angebracht werden, der die abgestrahl¬ ten Ultraschallwellen detektiert und demgemäß einen ord¬ nungsgemäßen Zustand meldet. Es zeigen:The invention solves the problem by means of a sound transducer mounted inside the keyboard, which preferably emits ultrasonic waves through the surface of the keyboard without the surface being visibly changed. The protective device is thus inconspicuous and continues to be protected against vandalism. Since the keyboard is protected against inspection by a hood anyway, a receiver can be attached above the keyboard, which detects the emitted ultrasound waves and accordingly reports a proper condition. Show it:
Fig. 1 eine Anordnung einer Tastatur mit Ultraschall- sender und -empfänger,1 shows an arrangement of a keyboard with ultrasound transmitter and receiver,
Fig. 2 eine mögliche Anbringung eineε Ultraschallsen¬ ders in dem Rahmen einer Tastatur.2 shows a possible attachment of an ultrasound transmitter in the frame of a keyboard.
Stark vereinfacht und schematisch ist in Fig. 1 eine Tasta¬ tur auf Grundplatte 10 unter einer Haube 13 dargestellt. Die Tastatur besteht aus einem Tastenrahmen 11 und einzel¬ nen Tasten 12a..d. Im Inneren der Tastatur ist an der Un¬ terseite des Tastaturrahmens 11 an einem Steg zwischen den Tasten 12a..d ein Ultraschallsender 14 angebracht, der elektrisch erregt wird. Oberhalb der Tastatur, im Beispiel in der die Tastatur schützenden Haube 13, ist ein Ultra¬ schallempfänger 15 angebracht. Das von ihm empfangende Si¬ gnal wird verstärkt, gleichgerichtet und einem Schwellwert¬ detektor zugeführt.A keyboard on base plate 10 under a hood 13 is shown in a highly simplified and schematic manner in FIG. 1. The keyboard consists of a key frame 11 and individual keys 12a..d. In the interior of the keyboard, on the underside of the keyboard frame 11, an ultrasonic transmitter 14 is attached to a web between the keys 12a..d, which is electrically excited. An ultrasound receiver 15 is attached above the keyboard, in the example in the hood 13 protecting the keyboard. The signal it receives is amplified, rectified and fed to a threshold detector.
Diese Einrichtungen sind in bekannter Art ausgeführt und in Fig. 1 nicht dargestellt. Der Ausgang des Schwellwertdetek- tors ist mit einer Steuereinheit für das die Tastatur als Eingabegerät benutzende Gerät verbunden. Solange der Schwellwertdetektor der Steuereinheit die Anwesenheit eines Signals meldet, bleibt das Gerät betriebsbereit und verwen¬ det die Tastatur als Eingabegerät.These devices are designed in a known manner and are not shown in FIG. 1. The output of the threshold detector is connected to a control unit for the device using the keyboard as an input device. As long as the threshold value detector reports the presence of a signal to the control unit, the device remains ready for use and uses the keyboard as an input device.
Bereits ein Blatt Papier, auf die Tastatur gelegt, dämpft die Abstrahlung des Ultraschallgebers 14 signifikant. Der Schwellwertdetektor ändert daher sein Signal an die Steuer¬ einheit, welche entsprechend reagiert. Befindet sich das Gerät im Zustand der Betriebsbereitschaft, so wird ein Ver¬ lust der Ultraschallübertragung, gemeldet durch den Schwellwertdetektor, als Manipulation aufgefaßt und das Ge¬ rät in einen Störungszustand versetzt. Dies gilt nicht, wenn ein Benutzer gerade zur Eingabe von Daten aufgefordert wurde, da die Schwächung von der Hand des Benutzers stammen kann. Das Gerät wird also dadurch geschützt, daß vor Beginn einer jeden Transaktion eines Bedieners der Tastatur der Schwellwertdetektor die Anwesenheit eines Signals melden muß. Dabei wird der Ultraschallgeber in der Tastatur bevor¬ zugt auf der Innenfläche einer Taste oder eines Tastenrah¬ mens angebracht. Vielfach ist das Material akustisch dünn genug, so daß aus der Tastatur ohne weitere Maßnahmen ein gut detektierbares Signal abgestrahlt wird, ohne daß die Anwesenheit des Ultraschallgebers sichtbar wird. Da die Oberfläche der Tastatur ungestört ist, kann auch nicht ein¬ fach erkannt werden, wo das Signal abgestrahlt wird, so daß Manipulationsversuche erschwert sind.A sheet of paper already placed on the keyboard significantly attenuates the radiation from the ultrasound transmitter 14. The threshold value detector therefore changes its signal to the control unit, which reacts accordingly. If the device is in the ready state, loss of ultrasound transmission, reported by the threshold value detector, is interpreted as manipulation and the device is put into a fault state. This does not apply when a user is prompted to enter data because the weakening can come from the user's hand. The device is thus protected in that the threshold value detector must report the presence of a signal before the start of each transaction by an operator of the keyboard. The ultrasound transmitter is preferably attached to the keyboard on the inner surface of a key or a key frame. In many cases, the material is acoustically thin enough so that an easily detectable signal is emitted from the keyboard without further measures, without the presence of the ultrasound transmitter becoming visible. Since the surface of the keyboard is undisturbed, it cannot be easily recognized where the signal is emitted, so that attempts at manipulation are more difficult.
Bei Tastaturen mit massivem metallischem Tastaturrahmen wird entsprechend Fig. 2 in einen Steg des Tastenrahmens 11 ein Sackloch von innen eingelassen, so daß die Ultraschall¬ wellen durch das verbleibende Material austreten können. Da es sich um ein Sackloch handelt, bleibt die Oberfläche un¬ verändert. In das Sackloch wird als Ultraschallgeber ein piezokeramisches Plättchen eingelassen und verklebt, das in bekannter Art mit elektrischen Kontakten und Anschlüssen versehen ist, welche mit einer Wechselspannungsquelle pas¬ sender Frequenz verbunden sind. Damit entsteht ein Ultra¬ schall abstrahlender Wandler, der von außen nicht sichtbar und nicht manipulierbar ist. Bei geeigneten Abmessungen des Sacklochs verstärkt dieses durch Resonanz das Signal, ins¬ besondere durch Verwendung eines Piezowandlers mit Radial¬ schwingungen, einer Schwingfrequenz von 40kHz, einem Loch¬ durchmesser von 12mm und einer Deckstärke von 0,6mm und dem Material Aluminium.In the case of keyboards with a solid metallic keyboard frame, a blind hole is let into the inside of a web of the key frame 11, as shown in FIG. 2, so that the ultrasonic waves can escape through the remaining material. Since it is a blind hole, the surface remains unchanged. A piezoceramic plate is inserted and glued into the blind hole as an ultrasound transmitter, which is provided in a known manner with electrical contacts and connections which are connected to an alternating voltage source with a suitable frequency. This creates an ultrasound-radiating transducer that is not visible from the outside and cannot be manipulated. With suitable dimensions of the blind hole, this amplifies the signal through resonance, in particular by using a piezo transducer with radial vibrations, an oscillation frequency of 40 kHz, a hole diameter of 12 mm and a covering thickness of 0.6 mm and the material aluminum.
Anstelle des Tastenrahmens 11 kann auch eine Taste, insbe¬ sondere eine Blindtaste, verwendet werden. Dies ist dann vorteilhaft, wenn die Stege zwischen den Tasten sehr schmal sind. Liegt die Ultraschallstrahlung im niederfrequenten Bereich, dann entsteht eine kugelförmige Abstrahlung, so daß der Empfänger nicht direkt oberhalb der Tastataur, sondern so¬ gar auch seitlich angebracht werden kann.Instead of the key frame 11, a key, in particular a blind key, can also be used. This is advantageous if the webs between the keys are very narrow. If the ultrasound radiation is in the low-frequency range, a spherical radiation occurs, so that the receiver cannot be attached directly above the keyboard, but even laterally.
Es sind ferner Lautsprecher auf Piezo- oder elektrodynami¬ scher Basis verfügbar, die nicht nur im hörbaren, sondern auch im Ultraschallbereich abstrahlen. Eine einfache Vari¬ ante der Erfindung besteht daher darin, einen solchen un¬ terhalb der Tastatur anzubringen, so daß die Schallstrah¬ lung durch die Schlitze zwischen den Tasten und dem Tasten¬ rahmen durchtritt. Eine akustische Kopplung mit einer Taste oder dem Tastenrahmen ist dabei nicht notwendig. Als Emp¬ fänger sind auch Elektret-Mikrophone verwendbar, deren Fre¬ quenzbereich meist bis in den Ultraschallbereich reicht. Eine andere Variante der Erfindung verwendet an Stelle des Ultraschallempfängers einen Reflektor. Durch die Laufzeit des Signals kann der Geber in der Art eines Echolots zur Abgabe kurzer Signale verwendet werden und danach in einer Sendepause als Empfänger dienen. Als Empfänger kann statt dessen auch ein zweiter Ultraschallwandler in die Tastatur eingebaut werden, so daß Geber und Empfänger getrennt sind. Gleichfalls ist es möglich, die Rolle von Geber und Empfän¬ ger statisch oder dynamisch zu vertauschen.Piezo or electrodynamic-based loudspeakers are also available, which radiate not only in the audible but also in the ultrasound range. A simple variant of the invention therefore consists in mounting one below the keyboard so that the sound radiation passes through the slots between the keys and the key frame. An acoustic coupling with a key or the key frame is not necessary. Electret microphones can also be used as receivers, the frequency range of which usually extends into the ultrasound range. Another variant of the invention uses a reflector instead of the ultrasound receiver. Due to the duration of the signal, the transmitter can be used in the manner of an echo sounder to emit short signals and then serve as a receiver in a transmission pause. Instead of this, a second ultrasonic transducer can also be installed in the keyboard as the receiver, so that the transmitter and receiver are separated. It is also possible to swap the role of the encoder and receiver statically or dynamically.
Für größere Tastaturen mit vielen Tasten kann es zweckmäßg sein, in die Tastatur mehrere Ultraschallwandler einzu¬ bauen, die im Zeitmultiplex auf einen gemeinsamen Empfänger wirken. Bei Verwendung eines Reflektors mit getrenntem Ul¬ traschallgeber und -empfänger ergeben sich von vornherein zwei Überwachungspunkte auf der Tastatur, deren Anzahl durch weitere Geber und Empfänger erhöht werden kann.For larger keyboards with many keys, it may be expedient to install several ultrasound transducers in the keyboard, which act on a common receiver in time division multiplexing. When using a reflector with a separate ultrasonic transmitter and receiver, there are two monitoring points on the keyboard from the outset, the number of which can be increased by further transmitters and receivers.
Auch ist es möglich, auf einen Empfänger ganz zu verzich¬ ten, indem die Abstrahlungsleistung bzw. der Abstrahlungs- widerstand des Ultraschallgebers überwacht wird. Durch die Dämpfung eines aufgelegten Materials wird dem Geber mehr Leistung entzogen und damit eine Erkennung eines Gegen¬ stands auf der Tastatur möglich.It is also possible to dispense with a receiver entirely by monitoring the radiation power or the radiation resistance of the ultrasound transmitter. By damping a material on top, the donor gets more Power withdrawn and thus an object on the keyboard can be recognized.
Zusätzlich oder anstelle einer Signalschwächung kann auch das Erregersignal moduliert werden und die Phasenlage der Modulation bestimmt werden. Damit kann Manipulationen vor¬ gebeugt werden, welche ein Signal aufnehmen und durch einen ähnlichen Sender wieder abstrahlen, was in der Regel zu ei¬ ner Phasenverschiebung bzw. Laufzeitänderung führen wird und damit erkannt wird. Als Modulation ist ein Pseudo- rauschen sehr zweckmäßig, weil dieses nicht einfach nachge¬ bildet werden kann. Durch einen Signalprozessor kann die dann notwendige Korrelationsanaylse erfolgen.In addition or instead of a signal weakening, the excitation signal can also be modulated and the phase position of the modulation can be determined. Manipulations can thus be prevented which pick up a signal and emit it again through a similar transmitter, which will generally lead to a phase shift or change in transit time and thus be recognized. A pseudo noise is very useful as modulation because it cannot be simulated easily. The then necessary correlation analysis can be carried out by a signal processor.
Anstelle von Ultraschall kann auch Schall im hörbaren Be¬ reich verwendet werden, der vorzugsweise von einem unter der Tastatur befindlichen separaten Lautsprecher abge¬ strahlt und von einem Elektretmikrophon empfangen wird. Elektronisch erzeugtes Pseudo-Rauschen hat den Vorteil, daß es vom Benutzer nicht wahrgenommen wird. Alternativ hierzu sind Impulse, die als Knackgeräusch wirken. Im Fall, daß eine akustische Rückmeldung für eine Tastenbetätigung als Schallimpuls oder kurzer Ton von einem Lautsprecher unter¬ halb der Tastatur abgegeben wird, kann dieser als Schallsi- gnal verwendet werden. Das gleiche Signal wird außerhalb der Transaktionszeiten in zufälligen Abständen erzeugt und ausgewertet, so daß eine Überdeckung der Tastatur entdeckt wird.Instead of ultrasound, it is also possible to use sound in the audible range, which is preferably emitted by a separate loudspeaker located under the keyboard and is received by an electret microphone. Electronically generated pseudo noise has the advantage that it is not perceived by the user. Alternatively, there are impulses that act as a crackling sound. In the event that acoustic feedback for a key actuation is given as a sound pulse or short tone from a loudspeaker below the keyboard, this can be used as a sound signal. The same signal is generated and evaluated at random intervals outside of the transaction times, so that an overlap of the keyboard is discovered.
Auch bei hörbaren Signalen ist eine Vertauschung von Sender und Empfänger möglich.The sender and receiver can also be swapped for audible signals.
Als Sender kann auch eine elektromagnetische Zunge nach Art eines Summers dienen, die gegen beispielsweise den Tasten¬ rahmen schlägt und damit diesen in Schwingungen versetzt, welche von dem Tastenrahmen abgestrahlt werden. An electromagnetic tongue in the manner of a buzzer can also serve as the transmitter, which strikes the key frame, for example, and thus sets it in vibration, which is emitted by the key frame.

Claims

Patentansprüche claims
1. Einrichtung zum Erkennen eines die Oberfläche einer Ta¬ statur bedeckenden Gegenstands, mit den Merkmalen: in der Tastatur befindet sich ein Schallgeber, der ein Signal in den Raum oberhalb der Tasta- turoberfläche abstrahlt; gegenüber der Tastatur im Abstrahlbereich des Schallgebers befindet sich ein Schallempfänger, so daß ein den Schallgeber bedeckender Gegenstand das beim Schallempfänger eintreffende Signal abschwächt; - der Schallempfänger ist über eine Auswerteschal¬ tung mit einer Steuerung verbunden, welche die Ta¬ statur oder ein die Tastatur enthaltendes Gerät zu sperren vermag.1. Device for recognizing an object covering the surface of a keyboard, with the features: in the keyboard there is a sound generator which emits a signal into the space above the keyboard surface; a sound receiver is located opposite the keyboard in the radiation area of the sound generator, so that an object covering the sound generator weakens the signal arriving at the sound receiver; - The sound receiver is connected via an evaluation circuit to a control which can lock the keyboard or a device containing the keyboard.
2. Einrichtung nach Anspruch 1, wobei Schallgeber und Schallempfänger vertauscht sind, indem ein Schallemp¬ fänger in der Tastaturoberfläche und ein Schallgeber gegenüber der Tastatur angeordnet sind.2. Device according to claim 1, wherein sound generator and sound receiver are interchanged by a sound receiver in the keyboard surface and a sound generator are arranged opposite the keyboard.
3. Einrichtung nach Anspruch 1, wobei der Schallempfänger durch einen Schallreflektor ersetzt ist und der Schall¬ geber als Schallempfänger mitverwendet wird.3. Device according to claim 1, wherein the sound receiver is replaced by a sound reflector and the sound generator is also used as a sound receiver.
4. Einrichtung nach Anspruch 3, wobei der Schallgeber und der Schallempfänger zeitlich abwechselnd als Geber und als Empfänger benuzt werden.4. Device according to claim 3, wherein the sound generator and the sound receiver are used alternately in time as a transmitter and as a receiver.
5. Einrichtung nach Anspruch 1, wobei der Schallempfänger durch einen Schallreflektor ersetzt ist und ein zweiter Schallwandler als Schallempfänger dient, der in ähnli¬ cher Art wie der Schallgeber ausgeführt und gleichfalls in der Tastatur angeordnet ist. 5. Device according to claim 1, wherein the sound receiver is replaced by a sound reflector and a second sound transducer is used as a sound receiver, which is designed in a similar manner to the sound generator and is also arranged in the keyboard.
6. Einrichtung nach einem der Ansprüche 1 bis 5, wobei mehrere Schallgeber oder mehrere Schallempfänger zeit¬ lich abwechselnd benutzt werden.6. Device according to one of claims 1 to 5, wherein a plurality of sound transmitters or a plurality of sound receivers are used alternately in time.
7. Einrichtung zum Erkennen eines die Oberfläche einer Ta¬ statur bedeckenden Gegenstands, mit den Merkmalen: in der Tastatur befindet sich ein Schallgeber, der ein Signal in den Raum oberhalb der Tastatur- oberflache abstrahlt; der Schallgeber ist mit einer Auswerteschaltung verbunden, welche den Abstrahlungswiderstand, die abgestrahlte Leistung oder ähnliche Parameter be¬ stimmt, die Auswerteschaltung ist mit einer Steuerung verbunden, welche die Tastatur oder ein die Tastatur enthaltendes Gerät zu sperren vermag.7. Device for recognizing an object covering the surface of a keyboard, with the features: in the keyboard there is a sound generator which emits a signal into the space above the keyboard surface; the sound transmitter is connected to an evaluation circuit which determines the radiation resistance, the radiated power or similar parameters, the evaluation circuit is connected to a controller which is capable of locking the keyboard or a device containing the keyboard.
8. Einrichtung nach einem der Ansprüche 1 bis 7, wobei die Tastatur aus einem Tastenrahmen besteht, dessen Außen¬ seite die Oberfläche der Tastatur außerhalb der Tasten bildet, und wobei der Schallgeber an der Innenseite an¬ gebracht ist.8. Device according to one of claims 1 to 7, wherein the keyboard consists of a key frame, the outside of which forms the surface of the keyboard outside the keys, and wherein the sound generator is attached to the inside.
9. Einrichtung nach einem der Ansprüche 1 bis 7, wobei der Schallgeber von innen in einen Tastenkopf, vorzugsweise einer Blindtaste, eingebaut ist.9. Device according to one of claims 1 to 7, wherein the sound generator is installed from the inside in a key top, preferably a blind key.
10. Einrichtung nach einem der Ansprüche 1 bis 9, wobei das Schallsignal ein Ultraschallsignal ist.10. Device according to one of claims 1 to 9, wherein the sound signal is an ultrasonic signal.
11. Einrichtung nach Anspruch 10, wobei das Ultraschallsi- gnal im Bereich zwischen 20kHz und 100kHz, vorzugs¬ weise 40kHz, liegt.11. The device according to claim 10, wherein the ultrasound signal is in the range between 20 kHz and 100 kHz, preferably 40 kHz.
12. Einrichtung nach Anspruch 10 oder 11, wobei der Schall¬ geber in einem von der Innenseite eingelassenes Sack¬ loch angebracht ist. 12. Device according to claim 10 or 11, wherein the sound generator is mounted in a blind hole let in from the inside.
13. Einrichtung nach Anspruch 12, wobei der Schallgeber ein Piezowandler mit Radialschwingungen ist und die Schwingfrequenz auf den Durchmesser des Sacklochs sowie die Stärke des verbleibenden Materials zwecks Resonaz abgestimmt ist.13. The device according to claim 12, wherein the sound generator is a piezo transducer with radial vibrations and the vibration frequency is matched to the diameter of the blind hole and the strength of the remaining material for the purpose of resonating.
14. Einrichtung nach Anspruch 12 oder 13, wobei das Sack¬ loch in einen Steg zwischen zwei Tasten eingelassen ist.14. Device according to claim 12 or 13, wherein the blind hole is let into a web between two buttons.
15. Einrichtung nach einem der Ansprüche 1 bis 8, wobei der Tastenrahmen oder ein Tastenkopf aus piezoelektrischem Material besteht und an der Unterfläche Kontakte zur Erregung bzw. zum Empfang von Schallsignalen angebracht sind.15. Device according to one of claims 1 to 8, wherein the key frame or a key head consists of piezoelectric material and on the lower surface contacts for excitation or reception of sound signals are attached.
16. Einrichtung nach einem der Ansprüche 1 bis 8, wobei ein elektrodynamischer Wandler auf einen mit dem Tastatur¬ rahmen starr verbundenen ferromagnetischen Gegenstand wirkt.16. Device according to one of claims 1 to 8, wherein an electrodynamic transducer acts on a ferromagnetic object rigidly connected to the keyboard frame.
17. Einrichtung nach einem der Ansprüche 1 bis 8, wobei ei¬ ne elektrisch erregte Zunge über eine lose Verbindung mit dem Tastenrahmen die Schallwellen überträgt.17. Device according to one of claims 1 to 8, wherein ei¬ ne electrically excited tongue transmits the sound waves via a loose connection to the key frame.
18. Einrichtung nach einem der Ansprüche 1 bis 8, wobei der Schallgeber ein Lautsprecher ist, der unterhalb der Ta¬ statur angebracht ist.18. Device according to one of claims 1 to 8, wherein the sound generator is a loudspeaker which is attached below the keyboard.
19. Einrichtung nach einem der bisherigen Ansprüche, wobei der Schallgeber zufällig zwischen Senden und Sendepause abwechselt und auch die Abwesenheit eines Signals in den Sendepausen ausgewertet wird.19. Device according to one of the preceding claims, wherein the sound generator randomly alternates between transmission and transmission pause and the absence of a signal is evaluated in the transmission pauses.
20. Einrichtung nach einem der bisherigen Ansprüche, wobei der Schallgeber modulierten Schall abstrahlt und die Auswerteschaltung auch Phasenverschiebungen oder Lauf¬ zeitVeränderungen auswertet. 20. Device according to one of the preceding claims, wherein the sound transmitter emits modulated sound and the evaluation circuit also evaluates phase shifts or changes in transit time.
21. Einrichtung nach Anspruch 20, wobei die Modulation durch ein Pseudorauschen erfolgt und die Phasenver¬ schiebung durch Korrelationsanalyse bestimmt wird.21. Device according to claim 20, wherein the modulation is carried out by a pseudo noise and the phase shift is determined by correlation analysis.
22. Einrichtung nach Anspruch 20, wobei das Sendesignal mo¬ duliert ist und die Auswerteschaltung eine Analyse der Hüllkurve durchführt.22. The device according to claim 20, wherein the transmission signal is modulated and the evaluation circuit carries out an analysis of the envelope.
23. Einrichtung nach Anspruch 22, wobei die Modulation durch Sprache oder Musik erfolgt.23. The device according to claim 22, wherein the modulation is carried out by speech or music.
24. Einrichtung nach einem der Ansprüche 1 bis 7, wobei daε Signal einer akustischen Rückmeldung das Signal des Schallgebers darstellt.24. Device according to one of claims 1 to 7, wherein the signal of an acoustic feedback represents the signal of the sounder.
25. Einrichtung nach Anspruch 24, wobei Signale der akusti¬ schen Rückmeldung zusätzlich ohne Tastaturbetätigung zu Zeiten der Betriebsbereitschaft außerhalb von Transak¬ tionen abgestrahlt werden, vorzugsweise mit zufällig variiertem Abstand der Zeitpunkte.25. The device according to claim 24, wherein signals of the acoustic feedback are additionally emitted without a keyboard operation at times of operational readiness outside of transactions, preferably with a randomly varied interval of the times.
26. Einrichtung zum Erkennen eines in den Raum oberhalb ei¬ ner Tastatur eingebrachten Gegenstandes, bei der in dem Raum oberhalb einer Tastaturoberfläche ein Schallfeld erzeugt wird, und bei dem ein das Schallfeld überwa¬ chender Detektor mit einer Steuerung verbunden ist, die eine durch einen in den Raum eingebrachten Gegenstand erzeugte Störung des Schallfeldes signalisiert.26. Device for recognizing an object introduced into the space above a keyboard, in which a sound field is generated in the space above a keyboard surface, and in which a detector monitoring the sound field is connected to a controller which is controlled by a Object introduced into the room signals disturbance of the sound field.
27. Einrichtung nach Anspruch 26, dadurch gekennzeichnet, daß der Detektor die Abgabe der Schallenergie und/oder den Abstrahlungswiderstand eines Schallgebers über¬ wacht.27. The device according to claim 26, characterized in that the detector monitors the emission of sound energy and / or the radiation resistance of a sound generator.
28. Einrichtung nach Anspruch 26 oder 27, dadurch gekenn¬ zeichnet, daß der Detektor auch als Schallgeber dient. 28. The device according to claim 26 or 27, characterized gekenn¬ characterized in that the detector also serves as a sound generator.
EP97903263A 1996-02-12 1997-02-12 Ultrasound keyboard protection arrangement Expired - Lifetime EP0888632B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19605092A DE19605092A1 (en) 1996-02-12 1996-02-12 Ultrasound keyboard protection
DE19605092 1996-02-12
PCT/EP1997/000643 WO1997029499A1 (en) 1996-02-12 1997-02-12 Ultrasound keyboard protection arrangement

Publications (2)

Publication Number Publication Date
EP0888632A1 true EP0888632A1 (en) 1999-01-07
EP0888632B1 EP0888632B1 (en) 1999-12-22

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US (1) US6011470A (en)
EP (1) EP0888632B1 (en)
AT (1) ATE188066T1 (en)
BR (1) BR9707412A (en)
DE (2) DE19605092A1 (en)
WO (1) WO1997029499A1 (en)

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EP0888632B1 (en) 1999-12-22
US6011470A (en) 2000-01-04
ATE188066T1 (en) 2000-01-15
BR9707412A (en) 1999-11-23
DE19605092A1 (en) 1997-08-14
WO1997029499A1 (en) 1997-08-14
DE59700895D1 (en) 2000-01-27

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