EP0838737B1 - Vorrichtung zur Erkennung einer Handbewegung auf einer Oberfläche, insbesondere für ein Uhrwerk - Google Patents

Vorrichtung zur Erkennung einer Handbewegung auf einer Oberfläche, insbesondere für ein Uhrwerk Download PDF

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Publication number
EP0838737B1
EP0838737B1 EP97118168A EP97118168A EP0838737B1 EP 0838737 B1 EP0838737 B1 EP 0838737B1 EP 97118168 A EP97118168 A EP 97118168A EP 97118168 A EP97118168 A EP 97118168A EP 0838737 B1 EP0838737 B1 EP 0838737B1
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EP
European Patent Office
Prior art keywords
sensors
variation
finger
frequency
electrical quantity
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 - Lifetime
Application number
EP97118168A
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English (en)
French (fr)
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EP0838737A1 (de
Inventor
Yvan Terés
Hugues Vuillème
Joachim Grupp
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Asulab AG
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Asulab AG
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Filing date
Publication date
Application filed by Asulab AG filed Critical Asulab AG
Publication of EP0838737A1 publication Critical patent/EP0838737A1/de
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Publication of EP0838737B1 publication Critical patent/EP0838737B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G21/00—Input or output devices integrated in time-pieces
    • G04G21/08—Touch switches specially adapted for time-pieces

Definitions

  • the present invention relates to a device identification of a manual action made by a finger on a surface and, more particularly, it concerns such a device comprising a set of sensors likely to be activated each by the finger of a user so as to generate a variation of a electrical quantity.
  • a device can be used in watch applications, such as a wristwatch including a device for recognizing characters traced by hand on the watch glass.
  • watch applications such as a wristwatch including a device for recognizing characters traced by hand on the watch glass.
  • the document EP-A-0 165 548 describes an electronic watch comprising a device for recognizing characters drawn on the hand on the watch glass.
  • a matrix of sensors photoelectric is arranged on the bottom surface of the glass.
  • the intensity of the light detected by the photoelectric sensors is modified, which allows the detection of the coordinates of the transcribed character.
  • the written character is then recognized from the coordinates detected.
  • the respective coordinates of the lines forming the traced character are stored in a device memory. These coordinates are compared to coordinates which are also stored in the memory device in order to find the coordinates of reference that are most similar to the coordinates corresponding to the character written on the glass.
  • the calculation of the center of gravity often presents many disadvantages.
  • the treatment of data necessary to take into account factors, such as the geometric arrangement of the activated sensors is a complex task that places a heavy load on the data processing circuit associated with these sensors and which results in a slow response time of this circuit.
  • the result of this calculation often lacks accuracy, which leads to recognition errors characters written by the user.
  • the document EP-A-0 572 368 describes a matrix of sensors which are arranged so that a interference (cross-talk) between the sensors. So, he is possible to approach the sensors from each other in order to have more sensors in the same space.
  • Such device can determine the movement of an object relative to the device, i.e. if the object approaches or moves away from the device.
  • This device is not however not suitable for distinguishing between multiple sensors operated simultaneously and only allows therefore not the identification of a manual action made by a finger on the surface of the sensors.
  • the document EP-A-0 289 427 describes a device thus that a method of exploiting the screen signal of a screen optical touch.
  • Several successive scan frames (at least three successive frames) of the screen activated are analyzed to determine the increase and the progression, from one frame to another, of the signal level.
  • This system has the disadvantage of being complex and therefore expensive.
  • the main object of the present invention is therefore to provide a device for identifying an action manual made by a finger on a remedial surface, at least in part, to the disadvantages of art prior.
  • the invention also aims to provide such a device that is simple and effective, which has a high reliability, which uses little energy and which better suited for use in a watch electronics than the devices of the prior art.
  • a watch 1 comprising a case 2, a bracelet 3, a crown 4, a bezel 5, a glass 6, needles of hours and minutes 7 and 8 and two devices digital display 9 and 10.
  • sensors discrete capacitors, referenced 11 to 22 can be arranged around the bezel 5 or the glass 6.
  • Figure 2 shows a section of watch 1.
  • a electronic circuit 23 is disposed in the housing 2.
  • a set of conductive electrodes, preferably transparent, are arranged on the inner face 24 of the glass 6, only five of these electrodes, referenced respectively K, M, S, O and E are represented on the figure 2.
  • the electrodes K to E are respectively connected to the electronic circuit 23 by conductors 25 to 29.
  • a battery 30 or other source of electrical energy is also arranged in the housing 2 and is connected to the pole positive of the electronic circuit 23 by a conductor 31.
  • Each of the electrodes K to E form one of the armatures of a series of capacitive sensors, the other armature of each of these capacitive sensors being formed by finger 32 of the watch wearer 1 when he touches the outer face of the glass 6 over a zone determined by face of a particular electrode.
  • the wearer's finger 32 is connected to the earth of the electronic circuit 23 by through the housing 2 which is in contact with the wrist thereof and which is respectively connected to the negative pole of electronic circuit 23 and battery 30.
  • Figure 3 shows the spatial arrangement of the whole electrodes arranged under the glass 6 of watch 1, of which these electrodes are part. All the sensors, including these electrodes are part of, are likely to be each activated by finger 32 so as to generate a variation of its capacity. This set of sensors is arranged respectively inside a set corresponding to specific areas of the surrounded area glass 6.
  • Figure 4 shows a block diagram of a embodiment of the identification device 40 used in watch 1 of figure 1 and which allows determine which sensor is most active among those who are under the contact surface of the finger placed by the user on the outer surface of the glass 6.
  • the identification device 40 comprises a set of capacitive sensors 41 which are all connected to means detection, among a subset of the sensors 41 which are activated simultaneously by the user, from the sensor activated with the greatest variation in capacity.
  • this embodiment includes sensors capacitive, note that it is possible to use other types of sensors with a variation of electrical quantity, such as capacity or resistance for example, when activated.
  • FIG. 5 shows a circuit using which describe the operation of the sensor device capacitive 41 according to the invention.
  • Each capacitive sensor includes a capacitor 51 whose armatures are formed, of a part, by the electrode fixed on the inner surface of the glass 6 and, on the other hand, by finger 32 of the user.
  • a stray capacitor 52 is also formed by the construction present between the fixed electrode in question and the case 2 of watch 1.
  • the sensor capacitive 51 and the stray capacitor 52 are connected in parallel between ground 53 and the entry of a multiplexer 54.
  • the detection means of the activated sensor presenting greatest variation in electrical quantity include means for converting total capacity of the fixed and condenser assembly interference from each capacitive sensor A to S in a signal of output whose frequency is proportional to this total capacity.
  • These means include in this example multiplexer 54 and a voltage controlled oscillator 43.
  • the multiplexer 54 is arranged to connect successively each capacitive sensor A to S at the input of the voltage controlled oscillator 43. As can be seen in FIG. 5, when they are thus connected, the capacitors 51 and 52 are connected in parallel between the ground 53 and the inverting input of an amplifier operational 55 part of the controlled oscillator in tension 43.
  • the voltage controlled oscillator 43 includes also resistors 56, 57 and 58 connected all in series between amplifier 55 output and ground 53.
  • the non-inverting input of amplifier 55 is connected to a junction between resistors 57 and 58.
  • the amplifier 55 and the resistors 56 to 58 form a Schmidt flip-flop which provides its output, i.e. at the junction between the resistors 56 and 57, a signal having an amplitude which is a function of the relative values of the voltages present on the inverting and non-inverting inputs of amplifier 55, either a high logic level, or a low logic level.
  • the voltage controlled oscillator 43 further comprises a resistor 61 connected between the output of the Schmidt rocker and the inverting input of the amplifier. This resistor 61 is part, with capacitors 51 and 52, a low-pass filter which integrates the voltage at the out of the Schmidt seesaw. The potential on armatures of capacitors 51 and 52 is applied to the inverting input of amplifier 55.
  • the oscillation frequency of the output signal from the voltage controlled oscillator 43 is proportional to the inverse of the total capacity of the two capacitors 51 and 52 connected in parallel.
  • the oscillation frequency of the oscillator voltage controlled 43 varies depending on the presence or the absence of the user's finger 32 on the face outside of the glass 6. If the wearer's finger 32 watch 1 is not placed on glass 6, one of the frames of capacitor 51 is therefore absent from the circuit shown in Figure 5.
  • the total capacity is in this case equivalent to the capacitance of the stray capacitor 52 and the oscillation frequency of the output signal the voltage controlled oscillator 43 is proportional to the reverse of this ability.
  • the capacitor 51 effectively acts on the input of the voltage-controlled oscillator 43.
  • the total capacity is equivalent to the sum of capacities of the two capacitors 51 and 52.
  • the oscillation frequency of the output signal the voltage controlled oscillator 43 is proportional to the sum of the capacities of these two capacitors.
  • the identification device of this invention takes advantage of this observation and chooses as only active sensor the one whose capacity variation is the biggest.
  • the identification device 40 further includes means for detecting the signal output of the voltage-controlled oscillator whose frequency variation is the greatest.
  • These means of output signal detection include a frequency 44 (see Figure 4), a memory device 45 and a comparator 46.
  • the operation of the frequency 44, memory device 45 and comparator 46 are all controlled at a rate determined by the frequency of the clock pulses from a clock circuit 47.
  • the frequency detector 44 can be produced by a pulse counter which is switched on for one fixed operating period. In this case, the frequency of each oscillator output signal controlled by voltage 43 is represented directly by the number of pulses received during this fixed period. It As a result, the frequency detector 44 generates a numerical value, i.e. the content of the counter, corresponding to the frequency of the output signal corresponding to each sensor.
  • the identification device 40 further includes an actuation detector 48 which is connected to the output of the frequency detector 44 so that it receives the binary words that come from this last.
  • the actuation detector 48 compares each binary word at a predetermined reference threshold corresponding to a capacity value indicating that a capacitive sensor was actually activated by the user.
  • this binary word is then stored in memory device 45.
  • comparator 46 is arranged to compare the numerical values of these binary words and identify the numerical value which corresponds to the capacitive sensor with the greatest variation in capacity. A output signal corresponding to this sensor is then supplied to a handwriting recognition device 49 or to another operating circuit.
  • capacitive sensors have been provided in the embodiment described below, all other sensor capable of exhibiting a variation of electrical quantity when operated can be used.
  • the invention is applicable not only to a set of sensors associated with the glass a watch or other writing or control device manual, but it can be repeated in several other applications.
  • sensors can also be deposited not on the glass but in periphery under the bezel 13.
  • the invention is applicable in any manually controlled device, to know in applications where pushers or others new control devices can be replaced by sensors as described below.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Electromechanical Clocks (AREA)
  • User Interface Of Digital Computer (AREA)

Claims (4)

  1. Vorrichtung, die dazu bestimmt ist, eine von einem Finger (32) auf einer Oberfläche ausgeführte manuelle Bewegung zu identifizieren, umfassend:
    eine Gesamtheit von Sensoren (41), die jeweils durch den Finger (32) in der Weise aktiviert werden können, daß sie eine Änderung einer elektrischen Größe hervorrufen, wobei diese Sensoren jeweils innerhalb einer entsprechenden Gesamtheit von bestimmten Zonen der Oberfläche angeordnet sind;
    dadurch gekennzeichnet, daß die Vorrichtung außerdem umfaßt:
    erste Mittel (42), die in einer Untergesamtheit der Sensoren (41), die gleichzeitig aktiviert werden, denjenigen aktivierten Sensor erfassen, der die größte Änderung der elektrischen Größe aufweist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die ersten Erfassungsmittel (42) umfassen:
    Mittel (54, 53) zum Umsetzen der elektrischen Größe jedes der Gesamtheit von Sensoren (41) in ein Ausgangssignal, dessen Frequenz zur elektrischen Größe proportional ist, und
    zweite Mittel (44, 45, 46) zur Erfassung des Ausgangssignals, dessen Frequenzänderung am größten ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die zweiten Erfassungsmittel (44, 45, 46) umfassen:
    einen Frequenzdetektor (44), der einen digitalen Wert erzeugt, der der Frequenz des Ausgangssignals entspricht, das jedem aktivierten Sensor entspricht,
    einen Speicher (45) zum Speichern der digitalen Werte und
    einen Komparator (46) zum Vergleichen der digitalen Werte und zum Identifizieren jenes Wertes, der dem Sensor entspricht, bei dem die Änderung der elektrischen Größe am größten ist.
  4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie außerdem umfaßt:
    einen Bewegungsdetektor (48), der erfaßt, ob die Änderung der elektrischen Größe wenigstens eines Sensors der Gesamtheit von Sensoren (41) einen vorgegebenen Schwellenwert übersteigt.
EP97118168A 1996-10-25 1997-10-20 Vorrichtung zur Erkennung einer Handbewegung auf einer Oberfläche, insbesondere für ein Uhrwerk Expired - Lifetime EP0838737B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9613061A FR2755269B1 (fr) 1996-10-25 1996-10-25 Dispositif d'identification d'une action manuelle sur une surface, notamment pour une piece d'horlogerie
FR9613061 1996-10-25

Publications (2)

Publication Number Publication Date
EP0838737A1 EP0838737A1 (de) 1998-04-29
EP0838737B1 true EP0838737B1 (de) 2002-01-09

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EP97118168A Expired - Lifetime EP0838737B1 (de) 1996-10-25 1997-10-20 Vorrichtung zur Erkennung einer Handbewegung auf einer Oberfläche, insbesondere für ein Uhrwerk

Country Status (8)

Country Link
US (1) US6184871B1 (de)
EP (1) EP0838737B1 (de)
JP (1) JPH10132968A (de)
KR (1) KR100522219B1 (de)
CN (1) CN1160656C (de)
DE (1) DE69709522T2 (de)
FR (1) FR2755269B1 (de)
SG (1) SG71049A1 (de)

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EP3839706A1 (de) 2019-12-20 2021-06-23 The Swatch Group Research and Development Ltd Verfahren und vorrichtung zur bestimmung der position eines objekts auf einer vorgegebenen fläche

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EP3839706A1 (de) 2019-12-20 2021-06-23 The Swatch Group Research and Development Ltd Verfahren und vorrichtung zur bestimmung der position eines objekts auf einer vorgegebenen fläche

Also Published As

Publication number Publication date
FR2755269A1 (fr) 1998-04-30
JPH10132968A (ja) 1998-05-22
DE69709522D1 (de) 2002-02-14
CN1181561A (zh) 1998-05-13
CN1160656C (zh) 2004-08-04
US6184871B1 (en) 2001-02-06
KR100522219B1 (ko) 2006-01-12
EP0838737A1 (de) 1998-04-29
DE69709522T2 (de) 2002-08-22
FR2755269B1 (fr) 1998-12-04
KR19980032629A (ko) 1998-07-25
SG71049A1 (en) 2000-03-21
HK1010927A1 (en) 1999-07-02

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