EP1128239A1 - 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
EP1128239A1
EP1128239A1 EP00200646A EP00200646A EP1128239A1 EP 1128239 A1 EP1128239 A1 EP 1128239A1 EP 00200646 A EP00200646 A EP 00200646A EP 00200646 A EP00200646 A EP 00200646A EP 1128239 A1 EP1128239 A1 EP 1128239A1
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EP
European Patent Office
Prior art keywords
portable object
object according
piezoelectric transducer
transistor
voltage
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
EP00200646A
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English (en)
French (fr)
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EP1128239B1 (de
Inventor
Jean-Jacques Born
Jean-Pierre Wattenhofer
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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
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 room timepiece, including a piezoelectric transducer for manual insertion of data. More particularly, the present invention aims to use the piezoelectric transducer functioning as a sound generator in a wristwatch with an alarm device for performing the function of a pusher.
  • the glass is activated manually by axial pressure on the edge of the glass.
  • the glass must be slightly mobile.
  • the glass is resiliently mounted relative to the box by means of a ring rigid rubber.
  • Piezoelectric sensors are connected to an electrical circuit placed under the dial and which detects the pressures exerted on these sensors.
  • the invention described in the Junghans patent provides a wristwatch which has no rod or push button and is therefore less costly to manufacture and a more attractive aesthetic appearance.
  • the watch functions of this watches are controlled by simple mechanical pressure on piezoelectric sensors which, in response to this request, produce an electrical voltage which acts on the desired watch function via an appropriate electronic circuit.
  • the Junghans watch unfortunately has certain disadvantages among which we can cite the fact that the glass must be mounted slightly mobile, which poses significant problems of adjustment of this glass relative to the box of the watch. These problems obviously have a negative impact on the costs of manufacturing and are only partially resolved by the use of a rigid ring in rubber disposed between said crystal and the middle part of said box. Indeed, due to its rigidity, the rubber ring can hardly compensate for the play between the watch glass and case, so that a good seal cannot be guarantee. The risks of moisture entering the watch are therefore significant which, it will be easily understood, is not acceptable. Likewise, particles solids can lodge between the rubber ring and the glass 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 the effect of these pressures, the piezoelectric sensors deform and generate an electrical voltage which is applied to the input of an electronic circuit of interpretation. In response to this signal, the electronic circuit will act on the function desired watchmaking.
  • the repetition of these pressures risks, after a certain damage, or even put the sensors out of use. Above all, it is not easy for the user to exert sufficient pressure to operate the sensors without being excessive and risk damaging these sensors.
  • the object of the present invention is to remedy the problems and drawbacks above as well as others by proposing a portable object whose means manual data entry include a piezoelectric transducer which does not risk being damaged by excessive mechanical pressure.
  • the present invention relates to a portable object such as, in particular, a timepiece, comprising display means of at least information and a box formed from an upper part comprising a glass covering the display means and a lower part delimited by a bottom located below said display means, this object comprising a transducer piezoelectric producing electrical voltage when 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 signal logic in response to the pressure exerted, this electronic circuit being arranged at the interior of said housing, characterized in that said piezoelectric transducer is arranged in the lower part of said housing and is rigidly connected to this housing.
  • the mechanical pressure which accompanies manual entry of data can be carried out anywhere the surface of the ice. Under the effect of this pressure, the wrist of the wearer of the watch exerts a reaction force on the case. The latter then deforms very slightly, whether plastic, metallic or other. As the piezoelectric transducer is rigidly connected to this housing, it is deformed by the deformations of the case and conventionally generates an electrical voltage in response to this distortion. There is no longer any risk of damaging the transducer under the effect of too high mechanical pressure. Likewise, the transducer, which is no longer stuck between a fixed part and a mobile part, can support a very large number of successive pressures without its physical characteristics degrade over time.
  • Another advantage of the present invention lies in the fact that the object portable has no moving parts. So in the particular case of a room watchmaking such as a wristwatch, the watch crystal is fixedly mounted by compared to the case of said watch, for example by gluing or by welding ultrasound or by chasing with the interposition of a seal between the glass and the box. The water resistance of the watch is thus not impaired and the construction of such watch is very simple and therefore inexpensive.
  • the present invention provides a watch whose horological functions can be controlled by simple mechanical pressure on the ice. So, the watch can be devoid of rod or push button, which further reduces more its manufacturing costs.
  • the watch can be devoid of rod or push button, which further reduces more its manufacturing costs.
  • other systems data entry by touch pressure using, for example, keys capacitive, inductive, ultrasonic or infrared.
  • 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 orders in which they consume Electric power. On the contrary, the data entry system according to the invention is permanently available without consuming any current.
  • the portable object further includes a second electronic circuit that operates the transducer piezoelectric 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 of entering data by mechanical pressure on the glass 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 is not not limited to such a timepiece and can easily be applied to any other portable object in which is arranged a piezoelectric transducer allowing manual data entry.
  • Figure 1 is represented a timepiece according to the invention, generally designated by the reference general digital 1.
  • the timepiece 1 conventionally comprises a case 2 provided with a middle 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 however not limited not 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 includes 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 in Figure 1, typically has the shape of a pellet. It can be housed in the back 6 of watch 1.
  • the face bottom of the battery 12 which constitutes one of its poles is electrically connected to the earth of watch 1, for example by means of a fixed spring contact 13 on the bottom 6 of said watch 1.
  • the other pole of the battery 12 which is constituted by its upper face is usually electrically connected to the movement horometric 8.
  • the housing 2 is delimited by a glass 14 covering means 16 for displaying time information.
  • these display means 16 consist of a dial 18 above which move an hour hand 20, a minute hand 22 and a hand 24 seconds. These are therefore analog means for displaying the time. he could also be digital display means constituted by a cell to liquid crystals.
  • the housing 2 has at its upper periphery a notch 26 in which is engaged a bezel 28 which secures the glass 14 on the housing 2.
  • the bezel 28 is fixedly mounted on the housing 2, for example by gluing or welding by ultrasound or by hunting.
  • the glass 14 is sealed against the case 2 through the use of a seal 30 wedged between the glass and the case.
  • a piezoelectric transducer 32 is arranged in the lower part of the housing 2 of the shows 1 and is rigidly connected to this case 2.
  • This transducer 32 can be used for the sole purpose of entering data into watch 1.
  • the transducer 32 is used at the same time as a sound generator for the alarm device of watch 1, and as a means to introduce data by successive mechanical pressure on the ice 14 of this watch 1.
  • the piezoelectric transducer 32 consists of a element made, for example, of a piezoelectric ceramic.
  • This item can have, without limitation, a circular shape, its diameter being typically between ten and fifteen millimeters, and its thickness being of the order of a few tenths of a millimeter.
  • this element is glued between two upper 34 and lower 36 metal electrodes.
  • the lower 36 electrode is rigidly connected to the bottom 6 of the housing 2 by any suitable means such as, for example, by collage.
  • the electrodes 34, 36 are connected, via an electronic circuit 38 training and interpretation which will be described in detail with reference to FIG. 2, at the terminals of the electric battery 12 by means of contact blades respectively 34a and 36a.
  • the electrical circuit 38 comprises, connected to the output of switching means comprising a transistor T R0 alternately on and off, 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 pulse pulse control signal corresponding to what is shown in curve A of FIG. 3, the abscissa of which represents time “t” and the ordinate la 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. 2 comprises, first of all, a capacitor C 1 mounted between the coil L 1 and the transducer 32.
  • the impedance of the coil L 1 is weak, so that it practically plays the role of a short circuit. Consequently, 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 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 operate as a sound generator, the capacitor C 1 has a low impedance and therefore acts substantially in the same way as a simple electrical connection between the coil L 1 and the transducer 32. The capacitor C 1 therefore does not disturb the operation of the transducer 32 as a sound generator.
  • the electrical circuit 38 for training and evaluation is completed by a passive filter 40 mounted in parallel at the terminals of the piezoelectric transducer 32.
  • This filter 40 conventionally consists of a resistor R 1 and a capacitor C 2 .
  • the filter 40 is used to filter the high frequency signal present at the terminals of the transducer 32 when the latter operates as a sound generator at a frequency of the order of 1 kHz, and to prevent this signal from propagates towards the amplification and conversion stages which will be described below.
  • the electrical signal can pass.
  • the electrical circuit 38 finally comprises, connected in parallel one after the other at 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 the transistor T R1 is connected to one of the ends "c" of the resistor R 2 , the other end of which is connected to the DC voltage source + E.
  • the conversion stage 44 comprises a CMOS inverter which consists of a pMOS transistor T R2 connected to an 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 connection point "f 'between the drains of the transistors T R2 and T R3 constitutes the output of the inverter 44.
  • the source of the transistor T R3 it is connected to the ground of the circuit 38.
  • the resistance R 2 which is of fairly high value, serves to maintain the gate-source voltage of transistor T R1 at 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 discharge through the resistor R 2 , so that the voltage across its terminals gradually regains its rest 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. Consequently, the gate-source voltage of the pMOS transistor T R2 is equal to -E. This voltage is lower than the threshold voltage of the transistor T R2 which is of the order of -0.6 V, so that this transistor T R2 conducts.
  • the gate-source voltage of the nMOS transistor T R3 is zero, that is to say less than the trigger voltage of this transistor T R3 .
  • 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 works well as an inverter.
  • the gate-source voltage of the transistor nMOS T R3 becomes greater than the triggering voltage of this transistor T R3 , so that the latter will start to conduct.
  • 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 works well as an inverter.
  • the voltage at the output point "f" of the conversion stage 44 therefore passes alternatively of the value + E when the piezoelectric transducer 32 is at rest at a zero voltage value when the transducer 32 is activated.
  • This signal logic is applied to the input of a microprocessor (not shown) which will control the watch functions of watch 1.
  • the passive filter 40 prevents high signals frequency generated by the transducer 28 to reach the amplification stages 42 and conversion 44. Consequently, the data entry system according to the invention is permanently available.
  • the filter can also be digital, to capacitors switched 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)
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 true EP1128239A1 (de) 2001-08-29
EP1128239B1 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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EP (1) EP1128239B1 (de)
AT (1) ATE434782T1 (de)
DE (1) DE60042444D1 (de)

Cited By (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
EP2530534A1 (de) * 2011-05-31 2012-12-05 IDT Technology Limited Handgetragene Vorrichtung mit Fingeraktivierung und Steuermechanismen
EP3062170A1 (de) * 2015-02-27 2016-08-31 Samsung Electronics Co., Ltd. Elektronische vorrichtung
CN107250926A (zh) * 2015-02-27 2017-10-13 三星电子株式会社 电子设备

Citations (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
US4769797A (en) * 1986-11-18 1988-09-06 Citizen Watch Co., Ltd. Stop watch

Patent Citations (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
US4769797A (en) * 1986-11-18 1988-09-06 Citizen Watch Co., Ltd. Stop watch

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NISHIMURA K ET AL: "DEVELOPMENT OF ELECTRONIC WATCH WITH A BUILT-IN SHOCK SENSOR", ELECTROCHIMICA ACTA,GB,ELSEVIER SCIENCE PUBLISHERS, BARKING, vol. 34, no. 3, 1 March 1989 (1989-03-01), pages 107 - 111, XP000025489, ISSN: 0013-4686 *

Cited By (11)

* 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
WO2012055656A3 (fr) * 2010-10-27 2012-06-28 The Swatch Group Research And Development Ltd Glace servant a fermer par le haut la boite d'un objet portable et procede de soudage d'une telle glace
CN103180787A (zh) * 2010-10-27 2013-06-26 斯沃奇集团研究和开发有限公司 用于封闭便携物体的壳体的顶部的表面件和焊接这类表面件的方法
JP2013542430A (ja) * 2010-10-27 2013-11-21 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド 携帯型物体のケースの上部を閉じるために用いられるクリスタル及びこのタイプのクリスタルを溶接する方法
CN103180787B (zh) * 2010-10-27 2015-09-09 斯沃奇集团研究和开发有限公司 用于封闭便携物体的壳体的顶部的表面件和焊接这类表面件的方法
US9149983B2 (en) 2010-10-27 2015-10-06 The Swatch Group Research And Development Ltd. Crystal used for closing the top of the case of a portable object and method of welding a crystal of this type
EP2530534A1 (de) * 2011-05-31 2012-12-05 IDT Technology Limited Handgetragene Vorrichtung mit Fingeraktivierung und Steuermechanismen
EP3062170A1 (de) * 2015-02-27 2016-08-31 Samsung Electronics Co., Ltd. Elektronische vorrichtung
CN107250926A (zh) * 2015-02-27 2017-10-13 三星电子株式会社 电子设备
US10237988B2 (en) 2015-02-27 2019-03-19 Samsung Electronics Co., Ltd. Electronic device
CN107250926B (zh) * 2015-02-27 2019-12-10 三星电子株式会社 电子设备

Also Published As

Publication number Publication date
ATE434782T1 (de) 2009-07-15
DE60042444D1 (de) 2009-08-06
EP1128239B1 (de) 2009-06-24

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