EP1128239B1 - Tragbares Objekt, insbesondere Uhrwerk, mit piezoelektrischem Transducer zum manuellen Eingeben von Daten - Google Patents

Tragbares Objekt, insbesondere Uhrwerk, mit piezoelektrischem Transducer zum manuellen Eingeben von Daten Download PDF

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Publication number
EP1128239B1
EP1128239B1 EP00200646A EP00200646A EP1128239B1 EP 1128239 B1 EP1128239 B1 EP 1128239B1 EP 00200646 A EP00200646 A EP 00200646A EP 00200646 A EP00200646 A EP 00200646A EP 1128239 B1 EP1128239 B1 EP 1128239B1
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EP
European Patent Office
Prior art keywords
piezoelectric transducer
portable object
object according
voltage
transistor
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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
EP00200646A
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English (en)
French (fr)
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EP1128239A1 (de
Inventor
Jean-Jacques Born
Jean-Pierre Wattenhofer
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Asulab AG
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Asulab AG
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Priority to EP00200646A priority Critical patent/EP1128239B1/de
Priority to AT00200646T priority patent/ATE434782T1/de
Priority to DE60042444T priority patent/DE60042444D1/de
Publication of EP1128239A1 publication Critical patent/EP1128239A1/de
Application granted granted Critical
Publication of EP1128239B1 publication Critical patent/EP1128239B1/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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G13/00—Producing acoustic time signals
    • G04G13/02—Producing acoustic time signals at preselected times, e.g. alarm clocks
    • G04G13/021—Details

Definitions

  • the present invention relates to a portable object such as, in particular, a timepiece, comprising a piezoelectric transducer for the manual introduction of data. More particularly, the present invention aims to use the piezoelectric transducer operating as a sound generator in an alarm wristwatch to perform the function of a push switch.
  • the ice are manually operated by axial pressure on the edge of the ice.
  • the ice must be slightly mobile.
  • the ice is elastically mounted relative to the box by means of a rigid rubber ring.
  • the piezoelectric sensors are connected to an electrical circuit arranged under the dial and which detects the pressures exerted on these sensors.
  • the invention described in the Junghans patent provides a wristwatch that is devoid of rod or push button and is therefore less expensive to manufacture and a more attractive aesthetic appearance.
  • the watch functions of this watch are controlled by simple mechanical pressure on piezoelectric sensors which, in response to this solicitation, produce a voltage that acts on the desired watch function via an appropriate electronic circuit.
  • the Junghans watch has unfortunately some drawbacks among which we can mention the fact that the ice must be mounted slightly movable, which poses significant problems of adjustment of this ice compared to the watch case. These problems of course have a negative impact on manufacturing costs and are only partially solved by the use of a rigid ring. rubber disposed between said ice and the middle of said box. Indeed, because of its rigidity, the rubber ring can hardly compensate for the games between the ice and the watch case, so that a good seal can not be guaranteed. The risks of moisture entering the watch are therefore important which, it will be easily understood, is not acceptable. Similarly, solid particles can be housed between the rubber ring and the ice and seize the operation of the mechanism.
  • the Junghans system is activated by a succession of mechanical pressures exerted on the ice of the watch. Under these pressures, the piezoelectric sensors deform and generate a voltage that is applied to the input of an electronic circuit of interpretation. In response to this signal, the electronic circuit will act on the desired horological function.
  • the repetition of these pressures may, after a while, damage or even put the sensors out of use. Above all, it is not easy for the user to exert sufficient pressure to actuate the sensors without being excessive and risk damaging these sensors.
  • a timepiece comprising means for displaying at least one piece of information and a case formed of an upper part comprising an ice covering the display means and a bottom part delimited by a bottom located underneath.
  • said display means said object comprising a piezoelectric transducer producing an electrical voltage when a mechanical pressure is exerted on said upper part, the voltage produced by the piezoelectric transducer being applied to a first electronic circuit which will generate a logic signal in response to the pressure exerted, this electronic circuit being arranged inside said housing, said piezoelectric transducer being arranged in the lower part of said housing and is rigidly connected to this housing.
  • the mechanical pressure that accompanies the manual introduction of data can be exerted anywhere on the surface of the ice.
  • the wrist of the wearer of the watch exerts a reaction force on the housing.
  • the latter then deforms very slightly, whether plastic, metal or other.
  • the piezoelectric transducer is rigidly connected to this housing, it is deformed by the deformations of the housing and typically generates an electrical voltage in response to this deformation. This is no more likely to damage the transducer under the effect of too high mechanical pressure.
  • the transducer which is no longer wedged between a fixed part and a moving part, can withstand a very large number of successive pressures without its physical characteristics being degraded over time.
  • the watch crystal is fixedly mounted relative to the case of said watch, for example by gluing or ultrasonic welding or by driving with interposition of a seal between the ice and the box.
  • the waterproofness of the watch is thus not impaired and the construction of such a watch is very simple and therefore inexpensive.
  • Such a device is a watch whose watch functions can be controlled by simple mechanical pressure on the ice.
  • the watch may be devoid of rod or push button, which further reduces its manufacturing costs.
  • tactile pressure data entry systems which use, for example, capacitive, inductive, ultrasonic or infrared keys.
  • the disadvantage of such systems lies in the fact that before they can be used, they must be placed in an active mode of receiving commands in which they consume electric current.
  • the portable object described in US 4,769,797 further comprises a second electronic circuit that operates the piezoelectric transducer as a source of vibration for a sound generator.
  • the same piezoelectric transducer can be used both as a sound generator for an alarm device, for example in an electronic wristwatch, and as a means for introducing data by mechanical pressure on the ice of this watch.
  • Such an embodiment is, it will be easily understood, particularly advantageous. It reduces the number of components used, and therefore the volume that these components occupy in the box, and limit manufacturing costs.
  • the present invention relates to a portable object of the type indicated in the preamble of claim 1 (described in US 47 69 797 and characterized by the features of the characterizing portion of claim 1. Optional features are described in the dependent claims.
  • the present invention is not limited to such a timepiece and, in particular, a wristwatch, the present invention is not limited to such a timepiece and can easily be applied any other portable object in which is arranged a piezoelectric transducer for the manual introduction of data.
  • the timepiece 1 conventionally comprises a housing 2 provided with a middle part 4 and a bottom 6 which delimits the housing 2 in its lower part.
  • the bottom 6 is made in one piece with the middle part 4.
  • the housing 2 can be made, for example, of a plastic material according to well-known injection techniques. The present invention is not limited to the choice of such a material and the housing 2 can be made of any type of material adapted to the needs of the watch industry such as, in particular, steel.
  • the timepiece 1 also comprises a horometric movement 8 mounted in a casing ring 10.
  • This movement 8 is supplied with current by an electric battery 12 which can, if necessary, be recharged after exhaustion.
  • the battery 12 shown schematically on the figure 1 typically has the shape of a pellet. It can be housed in the bottom 6 of the watch 1.
  • the lower face of the battery 12 which constitutes one of its poles is electrically connected to the mass of the watch 1, for example by means of a contact with spring 13 fixed on the bottom 6 of said watch 1.
  • the other pole of the battery 12 which is constituted by its upper face is, in the usual way, electrically connected to the horometric movement 8.
  • the housing 2 is delimited by an ice 14 covering display means 16 of a time information.
  • these display means 16 consist of a dial 18 above which move an hour hand 20, a minute hand 22 and a second hand 24. It is therefore analog means of displaying the time. It could also be digital display means constituted by a liquid crystal cell.
  • the housing 2 comprises at its upper periphery a notch 26 in which is engaged a telescope 28 which ensures the attachment of the lens 14 to the housing 2.
  • the bezel 28 is fixedly mounted on the housing 2, for example by gluing or by ultrasonic welding or else by driving.
  • the window 14 is sealed against the housing 2 by the use of a seal 30 wedged between the window and the housing.
  • a piezoelectric transducer 32 is arranged in the lower part of the case 2 of the watch 1 and is rigidly connected to this case 2.
  • This transducer 32 can be used for the sole purpose of introducing data into the watch 1.
  • the transducer 32 is used both as a sound generator for the alarm device of watch 1, and as a means for introducing data by successive mechanical pressure on the glass 14 of this watch 1.
  • the piezoelectric transducer 32 consists of an element made, for example, of a piezoelectric ceramic. This element may have, without limitation, a circular shape, its diameter typically being between ten and fifteen millimeters, and its thickness being of the order of a few tenths of millimeters.
  • this element is bonded between two upper metal electrodes 34 and lower 36.
  • the lower electrode 36 is rigidly connected to the bottom 6 of the housing 2 by any appropriate means such as, for example, by gluing.
  • the electrodes 34, 36 are connected via an electronic circuit 38 for training and interpretation which will be described in detail with reference to FIG. figure 2 at the terminals of the electric battery 12 by means of contact strips respectively 34a and 36a.
  • the electrical circuit 38 whose diagram is shown in FIG. figure 2 comprises, connected to the output of switching means comprising a transistor T R0 alternately passing and blocked, a coil L 1 .
  • the piezoelectric transducer 32 is connected in parallel to the coil L 1 .
  • This electrical circuit 38 receives, on an input connection "a", a pulsed pulse control signal corresponding to that shown in curve A of FIG. figure 3 whose abscissa represents the time "t" and the ordinate the voltage "v”. From the input terminal "a”, this signal is applied to the base of the transistor T R0 via a resistor R 0 .
  • the electrical circuit 38 for training and interpretation shown in FIG. figure 2 comprises, firstly, a capacitor C 1 mounted between the coil L 1 and the transducer 32.
  • the impedance of the coil L 1 is low, so that it plays practically the role of a short circuit. Therefore, the variation of the voltage at the connection point "b" of the transducer 32 is also small. To remedy this problem, the capacitor C 1 is added.
  • the variation of the voltage at the connection point "b" will be significant only if one has a high impedance at this connection point "b".
  • Gold at low frequency, the capacitor C 1 has a high impedance, so that the voltage at said connection point "b” reaches a high threshold.
  • the capacitor C 1 when the piezoelectric transducer 32 is driven at high frequency, typically of the order of 1 kHz, to function as a sound generator, the capacitor C 1 has a low impedance and thus acts substantially in the manner of a simple electrical connection between the coil L 1 and the transducer 32. The capacitor C 1 does not interfere with the operation of the transducer 32 as a sound generator.
  • the electrical circuit 38 for driving and evaluation is completed by a passive filter 40 connected in parallel across the piezoelectric transducer 32.
  • This filter 40 is conventionally composed of a resistor R 1 and a capacitor C 2 .
  • the filter 40 serves to filter the high frequency signal present across the transducer 32 when it operates as a sound generator at a frequency of the order of 1 kHz, and to prevent this signal from occurring. propagation to the amplification and conversion stages which will be described below.
  • the electric signal can pass.
  • the electrical circuit 38 finally comprises, connected in parallel with each other across the terminals of the passive filter 40, a polarization resistor R 2 , an amplification stage 42 and a conversion stage 44.
  • the amplification stage 42 comprises a pMOS transistor T R1 whose source is connected to the DC voltage source + E and whose drain is connected to a resistor R 3 .
  • the gate of transistor T R1 is connected to one of the ends "c" of resistor R 2 whose other end is connected to DC voltage source + E.
  • the conversion stage 44 comprises a CMOS inverter which consists of a pMOS transistor T R2 connected to a nMOS transistor T R3 .
  • the gates of these two transistors T R2 and T R3 are connected to the connection point "d" between the drain of the transistor T R1 and the resistor R 3 .
  • This connection point "d" constitutes the input of the inverter 44.
  • the source of the pMOS transistor T R2 is connected to the DC voltage source + E, and its drain is connected to the drain of the transistor T R3 .
  • the point of connection "f" between the drains of transistors T R2 and T R3 constitutes the output of inverter 44.
  • the source of transistor T R3 it is connected to the ground of circuit 38.
  • the resistance R 2 which is of considerable value, serves to maintain the gate-source voltage of the transistor T R1 to zero in order to prevent this transistor T R1 from conducting. It will also be noted that between two successive pressures exerted on the transducer 32, the latter can be discharged through the resistor R 2 , so that the voltage at its terminals gradually regains its resting value.
  • the transistor T R1 when the piezoelectric transducer 32 is at rest, the transistor T R1 does not conduct.
  • the connection point "d" between the drain of the transistor T R1 and the resistor R 3 is therefore connected to the ground of the circuit 38.
  • the connection point "d” constitutes the input of the conversion stage 40. Therefore, the gate-source voltage of the pMOS transistor T R2 is equal to -E. This voltage is lower than the threshold voltage of transistor T R2 which is of the order of -0.6 V, so that transistor T R2 conducts.
  • the gate-source voltage of the nMOS transistor T R3 is zero, that is to say less than the tripping voltage of this transistor T R3 . Therefore, the transistor T R3 is blocked.
  • the voltage at the connection point "f" which constitutes the output of the conversion stage 44 is equal to + E, while the voltage at the connection point "d" which constitutes the input of the conversion stage 40 is zero.
  • the conversion stage 44 functions well as an inverter.
  • the gate-source voltage of the nMOS transistor T R3 becomes greater than the tripping voltage of this transistor T R3 , so that the latter will start driving.
  • the voltage at the connection point "f" which constitutes the output of the conversion stage 44 will go to zero.
  • the voltage at the input of the conversion stage 44 is at + E, while the output of the conversion stage 40 is at zero.
  • the conversion stage 44 functions well as an inverter.
  • the voltage at the output point "f" of the conversion stage 44 therefore alternately passes the value + E when the piezoelectric transducer 32 is at rest at a zero voltage value when the transducer 32 is activated.
  • This logic signal is applied to the input of a microprocessor (not shown) which will control the watch functions of watch 1.
  • the passive filter 40 prevents the high frequency signals generated by the transducer 28 from reaching the amplification stages 42 and conversion 44. Therefore, the data input system according to the invention is permanently available. .
  • the filter can also be digital, switched capacitor or realized with an active filter.
  • the polarity of the supply voltage of the electrical circuit 38 for driving and evaluation can be reversed.
  • the bipolar transistor npn T R0 will be replaced by a pnp transistor, and the pMOS transistors will be replaced by nMOS transistors and vice versa.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Character Discrimination (AREA)
  • Electromechanical Clocks (AREA)

Claims (15)

  1. Tragbarer Gegenstand wie insbesondere ein Zeitmessgerät (1), mit Mitteln (16) zum Anzeigen wenigstens einer Information und einem Gehäuse (2), das aus einem oberen Teil, das ein die Anzeigemittel (16) abdeckendes Uhrenglas (14) enthält, und aus einem unteren Teil, das durch einen unter den Anzeigemitteln (16) befindlichen Boden (6) begrenzt ist, gebildet ist, wobei dieser Gegenstand außerdem einen piezoelektrischen Wandler (32) umfasst, der eine elektrische Spannung erzeugt, wenn auf den oberen Teil ein mechanischer Druck ausgeübt wird, wobei die durch den piezoelektrischen Wandler (32) erzeugte Spannung an eine erste elektronische Schaltung angelegt wird, die dazu ausgelegt ist, in Reaktion auf den ausgeübten Druck ein Logiksignal zu erzeugen, wobei dieser Gegenstand außerdem eine zweite elektronische Schaltung umfasst, die dazu ausgelegt ist, den piezoelektrischen Wandler (32) als Schwingungsquelle für einen Schallgenerator zu betreiben, wobei diese erste und diese zweite elektronische Schaltung in dem Gehäuse (2) angeordnet sind, wobei der piezoelektrische Wandler (32) in dem unteren Teil des Gehäuses (2) angeordnet ist und mit diesem Gehäuse (2) starr verbunden ist, dadurch gekennzeichnet, dass die erste elektronische Schaltung einen Kondensator (C1) umfasst, der dazu ausgelegt ist, den Schwellenwert der von dem piezoelektrischen Wandler (32) erzeugten Spannung anzuheben, wenn dieser mit der Frequenz arbeitet, mit der der mechanische Druck ausgeübt wird, wobei der Kondensator (C1) eine niedrige Impedanz aufweist und daher dazu ausgelegt ist, im Wesentlichen in der Weise einer einfachen elektrischen Verbindung zu wirken, wenn der piezoelektrische Wandler (32) angetrieben wird, um als Schallgenerator mit einer höheren Frequenz als der Frequenz, mit der der mechanische Druck ausgeübt wird, zu arbeiten.
  2. Tragbarer Gegenstand nach Anspruch 1, dadurch gekennzeichnet, dass der piezoelektrische Wandler (36) zwischen eine obere Elektrode (34) und eine untere Elektrode (36) geklebt ist.
  3. Tragbarer Gegenstand nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der piezoelektrische Wandler (32) auf den Boden (6) des Gehäuses (2) geklebt ist.
  4. Tragbarer Gegenstand nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die erste elektronische Schaltung, die zu dem piezoelektrischen Wandler (32) parallelgeschaltet ist, Mittel zum Verstärken (42) und zum Umsetzen (44) der unter der Wirkung eines mechanischen Drucks von dem piezoelektrischen Wandler (32) erzeugten Spannung in ein Logiksignal umfasst.
  5. Tragbarer Gegenstand nach Anspruch 4, dadurch gekennzeichnet, dass die erste elektronische Schaltung außerdem Mittel (40) umfasst, um die Schallimpulse zu filtern, die von dem piezoelektrischen Wandler (32) erzeugt werden, wenn dieser Letztere als ein Schallgenerator arbeitet.
  6. Tragbarer Gegenstand nach Anspruch 5, dadurch gekennzeichnet, dass die Filterungsmittel (40) einen Widerstand (R1) und einen Kondensator (C2) umfassen.
  7. Tragbarer Gegenstand nach Anspruch 5, dadurch gekennzeichnet, dass das Filter ein digitales Filter oder ein Filter mit geschalteten Kapazitäten ist oder mit einem aktiven Filter verwirklicht ist.
  8. Tragbarer Gegenstand nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass die Verstärkungs- und Umsetzungsmittel (42, 44) jeweils einen Schaltungszweig, in dem ein Transistor (TR1) und ein Widerstand (R2) in Reihe geschaltet sind, und einen Inverter, der zu diesem Schaltungszweig parallelgeschaltet ist, umfassen.
  9. Tragbarer Gegenstand nach Anspruch 8, dadurch gekennzeichnet, dass der Inverter vom CMOS-Typ ist.
  10. Tragbarer Gegenstand nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass ein Vorspannungswiderstand (R2) zwischen dem piezoelektrischen Wandler und dem den Transistor (TR1) enthaltenden Schaltungszweig parallelgeschaltet ist.
  11. Tragbarer Gegenstand nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die zweite elektronische Schaltung umfasst:
    - Kommutatormittel, die dazu ausgelegt sind, bei Empfang eines Steuerimpulssignals zu schließen und zu öffnen, wobei diese Mittel an den piezoelektrischen Wandler Impulse mit Schallfrequenz liefern,
    - Mittel, die eine Spannung liefern, um in den Umschaltmitteln einen elektrischen Strom fließen zu lassen, und
    - eine Spule (L1), die zwischen die eine Spannung liefernden Mittel und die Kommutatormittel geschaltet sind, wobei der piezoelektrische Wandler (32) zu der Spule (L1) parallelgeschaltet ist.
  12. Tragbarer Gegenstand nach Anspruch 11, dadurch gekennzeichnet, dass zwischen die Spule (L1) und den piezoelektrischen Wandler (28) ein Kondensator (C1) geschaltet ist.
  13. Tragbarer Gegenstand nach einem der Ansprüche 11 oder 12, dadurch gekennzeichnet, dass die zweite elektronische Schaltung außerdem eine mit der Spule (L1) in Reihe geschaltete Diode umfasst.
  14. Tragbarer Gegenstand nach einem der Ansprüche 11 bis 13, dadurch gekennzeichnet, dass die Kommutatormittel durch einen als Kommutator arbeitenden Transistor gebildet sind.
  15. Tragbarer Gegenstand nach Anspruch 14, dadurch gekennzeichnet, dass der Transistor (TR0) ein Bipolartransistor ist.
EP00200646A 2000-02-24 2000-02-24 Tragbares Objekt, insbesondere Uhrwerk, mit piezoelektrischem Transducer zum manuellen Eingeben von Daten Expired - Lifetime EP1128239B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00200646A EP1128239B1 (de) 2000-02-24 2000-02-24 Tragbares Objekt, insbesondere Uhrwerk, mit piezoelektrischem Transducer zum manuellen Eingeben von Daten
AT00200646T ATE434782T1 (de) 2000-02-24 2000-02-24 Tragbares objekt, insbesondere uhrwerk, mit piezoelektrischem transducer zum manuellen eingeben von daten
DE60042444T DE60042444D1 (de) 2000-02-24 2000-02-24 Tragbares Objekt, insbesondere Uhrwerk, mit piezoelektrischem Transducer zum manuellen Eingeben von Daten

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00200646A EP1128239B1 (de) 2000-02-24 2000-02-24 Tragbares Objekt, insbesondere Uhrwerk, mit piezoelektrischem Transducer zum manuellen Eingeben von Daten

Publications (2)

Publication Number Publication Date
EP1128239A1 EP1128239A1 (de) 2001-08-29
EP1128239B1 true EP1128239B1 (de) 2009-06-24

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EP00200646A Expired - Lifetime EP1128239B1 (de) 2000-02-24 2000-02-24 Tragbares Objekt, insbesondere Uhrwerk, mit piezoelektrischem Transducer zum manuellen Eingeben von Daten

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AT (1) ATE434782T1 (de)
DE (1) DE60042444D1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2447790A1 (de) * 2010-10-27 2012-05-02 The Swatch Group Research and Development Ltd. Glas für die obere Abdeckung des Gehäuses eines tragbaren Gegenstands
US20120306805A1 (en) * 2011-05-31 2012-12-06 Idt Technology Limited Hand-worn device with finger activation and control mechanisms
EP3062170A1 (de) * 2015-02-27 2016-08-31 Samsung Electronics Co., Ltd. Elektronische vorrichtung
KR20160105268A (ko) * 2015-02-27 2016-09-06 삼성전자주식회사 전자 장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1582507A (en) * 1978-05-24 1981-01-07 Seikosha Kk Piezoelectric vibrator driving circuit arrangements piezo-electrically driven sound generators and electronic timepieces including the same
US4618264A (en) * 1985-09-25 1986-10-21 Timex Corporation Acoustic alarm setting device for a timepiece
JPH0718934B2 (ja) * 1986-11-18 1995-03-06 シチズン時計株式会社 ストツプウオツチ

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ATE434782T1 (de) 2009-07-15
DE60042444D1 (de) 2009-08-06
EP1128239A1 (de) 2001-08-29

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