EP0667004B1 - Mouvement d'horlogerie radiocommande - Google Patents

Mouvement d'horlogerie radiocommande Download PDF

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Publication number
EP0667004B1
EP0667004B1 EP93924061A EP93924061A EP0667004B1 EP 0667004 B1 EP0667004 B1 EP 0667004B1 EP 93924061 A EP93924061 A EP 93924061A EP 93924061 A EP93924061 A EP 93924061A EP 0667004 B1 EP0667004 B1 EP 0667004B1
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EP
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Prior art keywords
pointer
time
clockwork
pointers
setting
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Expired - Lifetime
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EP93924061A
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German (de)
English (en)
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EP0667004A1 (fr
Inventor
Fritz SCHÄFFEL
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Individual
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Individual
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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C13/00—Driving mechanisms for clocks by master-clocks
    • G04C13/08—Slave-clocks actuated intermittently
    • G04C13/10—Slave-clocks actuated intermittently by electromechanical step advancing mechanisms
    • G04C13/105—Slave-clocks actuated intermittently by electromechanical step advancing mechanisms setting the time-indicating means
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal
    • G04R20/08—Setting the time according to the time information carried or implied by the radio signal the radio signal being broadcast from a long-wave call sign, e.g. DCF77, JJY40, JJY60, MSF60 or WWVB

Definitions

  • the present invention relates to a radio-controlled clockwork with at least two hands, a method for setting and the use of such a clockwork.
  • the time is nominated by radio signals that are broadcast by a central transmitter.
  • the time standard is supplied by an atomic clock from the Physikalisch-Technische Bundesweg, which controls the transmission of time signals via a long-wave transmitter.
  • radio clocks which can also be used in the private sector, which process the signals from this long-wave transmitter and which therefore always display the exact time.
  • These watches usually work with a digital display using light emitting diodes or liquid crystals.
  • Such a clock is known for example from DE 28 02 040 A1.
  • Radio clocks that work analogously have also become known for some time, i.e. a dial with two or three hands is used for the display.
  • a special constructive solution requires setting the time when the clock is started up, for example after a battery change and when the clock is adjusted, when larger time intervals have to be bridged, as is the case, for example, when changing from summer to winter time and vice versa.
  • Radio clocks are controlled by a control device which receives the time signals from a radio receiving device.
  • this control unit In order to bring the pointers into the correct position on the basis of the signals received, this control unit must receive information about the position of the pointers at this point in time. For this it is necessary to provide devices for recognizing the pointer position.
  • the pointer position detection is usually carried out in such a way that a special position is defined in the drive wheels which are assigned to the individual pointers, for example by means of a bore which is provided with a corresponding sensor device, e.g. a light barrier, cooperates.
  • the holes are usually provided so that the hands are exactly in the 12 o'clock position when the light from the light barrier penetrates the hole.
  • a radio clock according to the preamble of claim 1 is known from the work "Funkuhren” by Wolfgang Hilberg (ed.), Published in 1983 in Kunststoff and Vienna, pages 104-109.
  • This radio clock uses a retro-reflective sensor to determine the position of the hands.
  • the method disclosed there Adjusting the clock mechanism provides that the setting process is started with an electrical switching device, that the pointers are then moved until their position is determined by the reflection light barrier and that the pointers then move out of this position at a higher speed than normal clockwork operation are counted, the number of current pulses that are supplied to a drive device to move the pointers.
  • the setting process is stopped as soon as the number of pulses output matches the number of pulses required to reach the current time. This current time is determined by evaluating the time signals received by a radio receiver.
  • the watch has a stepper motor for the hour hand and a stepper motor for the minute hand.
  • the setting process is relatively unproblematic if the watch has two or three motors, as in the version described.
  • Such clockworks are very complex and expensive in design and also require a lot of space. In addition, they require a relatively large amount of electricity.
  • the use in smaller watches, for example in wristwatches, is therefore generally not an option.
  • the pointer position detection devices are very complex in terms of production and also in terms of the space required in relation to the rest of the construction.
  • Another disadvantage is the long operating time required for single-motor clockworks.
  • the electrically operated drive devices of such clockworks are used for the drive power required to move the pointer designed. If the pointers move faster during the adjustment process, a higher drive power is required.
  • the speed of the actuating gear must be limited, for example to a movement at sixteen times the usual speed. This means that the adjustment by one hour for a single-motor clockwork takes almost 4 minutes. A further increase in speed is ruled out, because otherwise the pointers cannot decelerate in the detected starting position due to the moment of inertia.
  • the hands are in the 2 o'clock position when the device is restarted, it takes 37 minutes for a single-engine clockwork alone until the hands are in the position in which the pointer position is detected.
  • Carrying out pointer position detection also causes problems with the battery capacity. As long as the pointer position detection process continues, the light-emitting diodes of the light barriers must be supplied with electrical energy at regular, short intervals. This energy must be taken from the battery, which leads to a rapid depletion of the, relatively expensive, battery, particularly in wristwatches. But also with other clocks, for example with alarm clocks or wall clocks, a lot of energy is required by the hand position detection.
  • EP-A-0 372 432 shows an autonomous radio-controlled clock which works with mechanical parts (pointers or numerical drop-down flaps) and in which, after actuation of a reset or start switch, the current time display is moved to a position corresponding to 0.00 hrs . After receiving time information, the time display is moved to the corresponding position in rapid traverse.
  • EP-A-0 204 851 shows a clock with an analog time display, in which a hand position detection is not provided.
  • an electronic counter is provided, which begins at the beginning of an hour in the zero position and counts the pulses supplied to the second hand every second until the counter reading 3599 is reached and a new hour begins. With the help of a time signal arriving every hour on the hour or every day, the advance or lag of the second hand is compensated for by this counter.
  • DCF 77 Conrad Elektronik GmbH, Hirschau, Germany, has sold a radio clock module under the designation DCF 77, which according to the instructions for use consisted of a time signal receiver with which the time information was received, decoded and digitally displayed with an LCD. One or more electrical analog clocks could be controlled with the help of control outputs.
  • the method according to the invention is the subject of claim 8.
  • the pointers are brought into a predetermined position by a mechanical device to be operated by the user.
  • This position can be, for example, the 12 o'clock position of all hands.
  • the starting position of the hands is preferably selected to be variable, in such a way that it corresponds to the elapsed full hour.
  • this variant presupposes that the user has a different clock, which at least enables a rough display of the time.
  • a variable starting position of the pointer which e.g. corresponds to the elapsed full hours, the positioning times that the clockwork needs to move the hands from this starting position to the current position are significantly reduced and is a maximum of approx. 5 minutes.
  • the clockwork according to the invention is provided with three hands.
  • the first actuating device for the second hand contains an electrical switch, by means of which the drive device is temporarily set in operation. It is thus possible to move the second hand electrically into the starting position, preferably the 12 o'clock position, with the aid of the drive device. If this e.g. at four times the usual rotation speed, this setting takes less than 15 seconds. The user then moves the hour and minute hands to the predetermined position.
  • This embodiment has the advantage that the connection between the drive device and the second hand, which is usually produced by a toothing, is not interrupted for setting the clock must become.
  • a mechanical setting device for the second hand can also be provided.
  • FIGS. 1 and 2 An embodiment of the clockwork according to the invention, in which the pointers have been omitted for the sake of clarity, is described with reference to FIGS. 1 and 2.
  • the clockwork shown has a housing 1 consisting of plastic, in which a compartment 3 for a commercially available battery is provided by a housing wall 2.
  • a bore 7 is provided in the bottom of the housing 1, into which the plastic hour wheel 10 is inserted during assembly, which is provided with a hollow cylindrical shoulder 11 on which the hour hand is placed.
  • the minute wheel 15 is inserted, which also has a hollow cylindrical extension 16 which penetrates the hollow cylindrical extension 11 of the hour wheel and on which the minute hand is placed.
  • An intermediate wheel 18 is provided for transmitting the rotary movement from the minute wheel 15 to the hour wheel 10, the transmission taking place in a ratio of 1:60.
  • the shaft of the second wheel 20 which is arranged in a separate preassembled part, the drive 22, engages in the hollow cylindrical projection 16 of the minute wheel.
  • the drive 22 consists of a holding plate 23 in which an electric drive 24 consisting of a stator arrangement 25, a rotor 26 and a coil 27 is held.
  • a gear 30 is arranged on the rotor 26, concentrically to the latter, which transmits the rotary movement of the rotor to the second gear 20 via the intermediate gears 32 and 34.
  • a cover plate 36 holds the parts of the drive together in the assembled state.
  • the housing 1 is closed on its side facing away from the dial with a cover 40.
  • this cover 40 there is an opening 42 in which an adjusting wheel 43 is provided for setting the minute hand and hour hand.
  • first electrical switch 44 a first electrical switch 44, a second electrical switch 46 and a third electrical switch 48 are located in the cover, the function of which will be described below.
  • the clock is controlled by an electronic module 50, the construction of which will now be explained with reference to FIG. 3.
  • the electronic assembly has a radio receiving device 52 which is connected to an antenna 53.
  • the radio receiving device is intended to receive the signals of a transmitter that transmits time signals.
  • time signals are broadcast every second.
  • a so-called time telegram from which the date and time are derived, is additionally transmitted at predetermined time intervals.
  • the signals of the radio receiving device are transmitted to a control device 55, which is implemented by a conventional microprocessor.
  • the control device 55 is controlled by a program which is stored in a memory 56.
  • the device also has a quartz controller 58 so that the clock can also be operated when no signals are received from the time transmitter.
  • control device 55 and Memory 56 can be combined into a block.
  • the first electrical switching device 44, the second switching device 46 and the third electrical switching device 48 are also connected to the microprocessor.
  • the signals from the time transmitter are received by the radio receiving device 52 and forwarded to the microprocessor 55.
  • the microprocessor outputs corresponding pulses via which the drive device 28 is controlled.
  • the output of a pulse means that the rotor 26 rotates a full or half revolution depending on the design. This causes the second wheel 20 to move forward 6 ° clockwise. The rotary movement of the second wheel, correspondingly reduced, is transmitted to the minute wheel and the hour wheel.
  • the clock must be adjusted when the watch is started up for the first time or after an interruption in operation, for example due to a battery change.
  • the embodiment offers two different possibilities for this adjustment, which depend on the position of the switch 48.
  • the seconds and minute hands are set to "12" and the hour hand to the time that corresponds to the full elapsed hour. For example, if the time to be set is 5:30 a.m., the clock is set to 5:00 a.m.
  • the setting of the second hand is carried out by the electrical switch 44.
  • the microprocessor When the switch is activated, the microprocessor outputs signals to the drive device 28 in rapid succession, which cause the drive device 28 to advance rapidly. As soon as the second hand has reached the 12 o'clock position, the switch 44 is returned to its starting position and the second hand is held in this position.
  • the minute and hour hands are moved to the 12 o'clock position or the position of the previous full hour. This is done mechanically by the user using the adjusting wheel 43.
  • the switch 46 is actuated, which outputs a start signal to the processor 55, by means of which the time setting process begins.
  • the control device now waits until it has received the first time telegram from the radio receiving device 52.
  • the controller operates according to the first alternative, it calculates the time difference between the 12 o'clock position and the current time and, from this, the number of pulses required to move the clock at that time.
  • the pulses required for this are then output in rapid succession, for example four pulses per second, so that the setting process for an hour takes a total of 15 minutes.
  • the pulses are counted and serve the processor as a measure of the position of the pointers. Since the time continues during the setting process, the number must the pulses required to move from the original pointer position to the current time are adjusted accordingly.
  • the setting process continues until the current time is reached.
  • the processor assumes that the hands are in a position which corresponds to the last elapsed hour. Again, the difference between the current time and the time given by the pointer position is determined and the drive is subjected to a number of pulses in order to bring the hands into the required position of the current time.
  • the advantage of the first alternative is that no reference time is required for this, since the entire setting is from a fixed pointer position, namely e.g. 12 o'clock, goes out.
  • the disadvantage is that the setting can take a long time. Since clockworks of the type discussed here can generally only run in one direction, namely forward, high response times occur.
  • the second alternative has the disadvantage that the current time must be known approximately. In contrast, however, it has the advantage that the response time is very short. If, for example, sixteen pulses per second are used for setting, this means that the maximum setting time for this alternative is only about 5 minutes.
  • the setting method is preferably used, which assumes the setting of the elapsed full hour. As explained, this has the advantage that short response times result. In contrast, the disadvantage that the clock must be known approximately does not play a role, since in regions in which such time transmitters are installed, the time is generally also available.
  • the electrical switching device 44 which is used to set the second to 12 o'clock, is omitted.
  • the second is then set by the user using a mechanical setting device.
  • two setting devices can also be provided, in which the first acts on the minute and hour hands and the second only on the second hand.
  • the clockwork then only has one or two mechanical setting devices with which the user sets the desired time to be specified, preferably the full elapsed hour.
  • the battery is removed. As soon as the hands are set to the specified value, the battery is inserted again and the clock starts as soon as the control device receives the signal for the full minute from the radio receiving device.
  • the aforementioned embodiments of the Clockwork according to the invention can be used in different clocks, in wall clocks, grandfather clocks, alarm clocks and in wristwatches.
  • the clockwork according to the invention can be coupled with a conventional mechanical alarm trigger. It is also possible to couple the alarm clock with an electronic alarm trigger. In this case, however, an LCD display must be provided in order to set and display the alarm clock.
  • the crown is used as a mechanical setting device for the time.
  • the switch 46 is then designed as a switch which is actuated by disengaging and reinserting the crown. In this case, the clock starts to run as soon as the crown is inserted.
  • a quartz mechanism is preferably used in all the exemplary embodiments, which outputs control signals to the control device, with the aid of which the time can be controlled when no radio signal is available or when the radio signal cannot be received temporarily.
  • the control signals basically process the signals output by the quartz device.
  • the radio receiving device is only used at predetermined time intervals, for example once an hour. activated to synchronize the displayed time according to the received time and to correct the time if necessary.
  • the advantage of this embodiment is that the power consumption is further reduced, which is of particular interest for wristwatches and alarm clocks.
  • the use of a quartz movement has the further advantage that it can be used to calculate how long the time has been since the start of the setting process. This is important if the radio clock does not receive a signal for a long time at the start of the setting process. Is the current time e.g. 10.55 a.m., the user must set 10.00 a.m. as the starting time for the hand setting. If it now takes, for example due to a temporary fault, 10 minutes until the first radio signal is received and the hand position can be set, the watch would assume a hand position from 11 a.m. and would therefore only adjust the hands by 5 minutes with respect to the starting position . This would, however, result in a false report of 1 hour.
  • the processor can calculate back that the predefined pointer position was set at 10.55 a.m.
  • the control device 55 can determine from this that the preset pointer position is 10 a.m. and cause a corresponding pointer movement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Toys (AREA)
  • Vehicle Body Suspensions (AREA)
  • Electric Clocks (AREA)

Claims (14)

  1. Mécanisme d'horlogerie à radio-commande et à affichage analogique, qui fonctionne sans reconnaissance de la position d'affichage, comprenant :
    - au moins deux éléments d'affichage,
    - une source de courant,
    - un dispositif d'entraînement (24) qui entraîne les éléments d'affichage,
    - un dispositif de réglage mécanique pour les éléments d'affichage (43, 44, 46) à actionner par l'utilisateur,
    - une unité de commande (55) qui délivre des signaux de commande pour commander ce dispositif d'entraînement (24),
    - un dispositif de réception radio (52) qui capte des signaux temporels depuis un émetteur temporel et transmet ceux-ci au dispositif de commande (55),
    dans lequel ladite source de courant, ledit dispositif d'entraînement (24), ledit dispositif de commande (55) et ledit dispositif de réception radio (52) sont agencés dans un boîtier commun.
    caractérisé en ce que
    le dispositif de commande (55), applique au dispositif d'entraînement (24), en partant d'une position de départ prédéterminée des éléments d'affichage, dans laquelle ils ont été amenés par l'utilisateur au moyen dudit dispositif de réglage pour les éléments d'affichage (43, 44, 46) et qui correspond à un temps déterminé, des signaux de commande qui ont pour effet d'augmenter la vitesse du déplacement des éléments d'affichage, aussi longtemps jusqu'à ce que ceux-ci aient atteint une position qui correspond au temps actuel.
  2. Mécanisme d'horlogerie selon la revendication 1, caractérisé en ce que ladite position de départ prédéterminée n'est pas modifiable.
  3. Mécanisme d'horlogerie selon la revendication 2, caractérisé en ce que ladite position de départ prédéterminée est modifiable en fonction du temps actuel respectif.
  4. Mécanisme d'horlogerie selon les revendications 2 et 3, caractérisé en ce qu'il est prévu un dispositif d'inversion (48) au moyen duquel le mécanisme peut être inversé depuis une première alternative de réglage, dans laquelle la position de départ prédéterminée est fixée, vers une seconde alternative de réglage, dans laquelle la position de départ prédéterminée dépend du temps actuel.
  5. Mécanisme d'horlogerie selon l'une ou l'autre des revendications 3 et 4, caractérisé en ce que la position de départ prédéterminée en fonction du temps actuel correspond à l'heure entière écoulée du temps actuel.
  6. Mécanisme d'horlogerie selon l'une au moins des revendications 1 à 5, caractérisé en ce qu'il est prévu un troisième élément d'affichage, réalisé sous forme d'une aiguille des secondes, et en ce qu'il est prévu un premier dispositif de commutation (44) au moyen duquel l'aiguille des secondes peut être commutée au moyen du dispositif d'entraînement (24) dans une vitesse de rotation accrue, afin d'amener ladite aiguille des secondes dans une position de départ prédéterminée.
  7. Mécanisme d'horlogerie selon l'une au moins des revendications 1 à 6, caractérisé en ce qu'il prévu un second dispositif de commutation (46) au moyen duquel l'opération de réglage, par laquelle a lieu le passage des éléments d'affichage depuis la position de départ prédéterminée jusque dans la position d'affichage qui correspond au temps actuel, peut être démarrée par un utilisateur.
  8. Procédé pour le réglage d'un mécanisme d'horlogerie à radio-commande et à affichage analogique selon la revendication 7, caractérisé par les opérations suivantes :
    - on arrête le dispositif d'entraînement de manière que les éléments d'affichage ne puissent plus exécuter aucun mouvement,
    - on amène les éléments d'affichage dans ladite position de départ prédéterminée des éléments d'affichage, à l'aide d'une roue de réglage (44) susceptible d'être actionnée par un utilisateur et qui forme un composant dudit dispositif de réglage mécanique des éléments d'affichage (43, 44, 46),
    - on démarre l'opération de réglage avec le dispositif de commutation électrique (46),
    - on détermine le temps actuel par exploitation des signaux temporels reçus par un récepteur radio, au moyen dudit dispositif de commande (55),
    - on déplace les éléments d'affichage avec une vitesse accrue depuis ladite position de départ prédéterminée, et l'on compte le nombre d'impulsions de courant qui sont envoyées audit dispositif d'entraînement (24), afin de déplacer les éléments d'affichage,
    - on compare le nombre des impulsions envoyées avec le nombre des impulsions qui est nécessaire pour atteindre le temps actuel,
    - on termine le processus de réglage dès que l'on a envoyé le nombre d'impulsions qui est nécessaire pour amener les éléments d'affichage dans une position qui correspond au temps actuel,
    - on poursuit le fonctionnement normal du mécanisme d'horlogerie.
  9. Procédé selon la revendication 8, caractérisé en ce que ladite position de départ prédéterminée des éléments d'affichage est donnée de manière non-modifiable.
  10. Procédé selon la revendication 8, caractérisé en ce que la position de départ prédéterminée des éléments d'affichage dépend du temps actuel.
  11. Procédé selon l'une des revendications 8 à 10, caractérisé en ce qu'il est prévu une aiguille des secondes, qui est susceptible d'être amenée par voie électrique au moyen du dispositif d'entraînement (24) dans ladite position de départ prédéterminée des éléments d'affichage.
  12. Utilisation d'un mécanisme d'horlogerie à radio-commande selon l'une des revendications 1 à 7 pour la réalisation d'une horloge murale ou d'une horloge à poser.
  13. Utilisation d'un mécanisme d'horlogerie à radio-commande selon l'une des revendications 1 à 7 pour la réalisation d'un réveil.
  14. Utilisation d'un mécanisme d'horlogerie à radio-commande selon l'une des revendications 1 à 7 pour la réalisation d'une montre de poignet.
EP93924061A 1992-10-31 1993-10-27 Mouvement d'horlogerie radiocommande Expired - Lifetime EP0667004B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4236903 1992-10-31
DE4236903A DE4236903C2 (de) 1992-10-31 1992-10-31 Funkgesteuertes Uhrwerk
PCT/EP1993/002983 WO1994010612A1 (fr) 1992-10-31 1993-10-27 Mouvement d'horlogerie radiocommande

Publications (2)

Publication Number Publication Date
EP0667004A1 EP0667004A1 (fr) 1995-08-16
EP0667004B1 true EP0667004B1 (fr) 1997-06-04

Family

ID=6471871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93924061A Expired - Lifetime EP0667004B1 (fr) 1992-10-31 1993-10-27 Mouvement d'horlogerie radiocommande

Country Status (6)

Country Link
US (1) US5671192A (fr)
EP (1) EP0667004B1 (fr)
JP (1) JP3378006B2 (fr)
AT (1) ATE154148T1 (fr)
DE (2) DE4236903C2 (fr)
WO (1) WO1994010612A1 (fr)

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DE4424337C2 (de) * 1994-07-11 1997-10-23 Braun Ag Verfahren zum Stellen der Zeiger einer elektrischen Uhr und entsprechende Uhr
DE4436707C2 (de) * 1994-10-14 1999-03-18 Braun Ag Verfahren zum Einstellen der Zeiger einer analog anzeigenden autonomen Funkuhr
US6269055B1 (en) 1998-11-16 2001-07-31 Quartex, A Division Of Primex, Inc. Radio-controlled clock movement
WO2000062132A1 (fr) * 1999-04-12 2000-10-19 Quartex Rouages d'horloge, horloge et leur procede de fonctionnement
US6466517B1 (en) 1999-04-27 2002-10-15 Kienzle Time Hk Ltd. Global travel clock
US20040052161A1 (en) * 2002-09-17 2004-03-18 Steven Liao Mechanical clock having wireless manipulation and adjustment function
US6922375B2 (en) * 2003-03-17 2005-07-26 Li-Mei Shen Super-thin hanging clock
US20050259722A1 (en) * 2004-05-21 2005-11-24 Reginald Vanlonden Wireless clock system
US20060171259A1 (en) * 2005-02-03 2006-08-03 Tsai-Te Liu Biasing member for securely connecting minute wheel and hour wheel for radio-controlled clocks
DE602005012076D1 (de) * 2005-07-01 2009-02-12 Eta Sa Mft Horlogere Suisse Verfahren zur Synchronisierung einer analogen Anzeige und eines flüchtigen Zähler in einer Uhr
US7879104B2 (en) 2006-11-15 2011-02-01 Warsaw Orthopedic, Inc. Spinal implant system

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DE2802040A1 (de) * 1978-01-16 1979-07-19 Peter Gravenhorst Zeitzeichengesteuertes digitaluhrsystem mit hoher stoersicherheit
DE3421189A1 (de) * 1984-06-07 1985-12-12 Kieninger & Obergfell, Fabrik für technische Laufwerke und Apparate GmbH & Co, 7742 St Georgen Elektrische uhr
DE8815281U1 (fr) * 1988-12-08 1990-04-05 Junghans Uhren Gmbh, 7230 Schramberg, De
DE8815765U1 (fr) * 1988-12-20 1990-04-26 Junghans Uhren Gmbh, 7230 Schramberg, De
DE4008898A1 (de) * 1990-03-20 1991-10-10 Forschungsgesellschaft Fuer Fe Elektronische zeigerstandsspeichereinrichtung bei einer elektronischen uhr, insbesondere funkgesteuerten uhr
DE4128752C2 (de) * 1991-08-29 1997-12-04 Junghans Uhren Gmbh Stellungsdetektions- und -Korrektureinrichtung
US5363348A (en) * 1992-09-04 1994-11-08 Damle Madhav N High resolution, remotely resettable time clock

Also Published As

Publication number Publication date
DE4236903C1 (de) 1994-03-10
JP3378006B2 (ja) 2003-02-17
US5671192A (en) 1997-09-23
WO1994010612A1 (fr) 1994-05-11
DE4236903C2 (de) 1999-04-29
EP0667004A1 (fr) 1995-08-16
JPH08504942A (ja) 1996-05-28
DE59306695D1 (de) 1997-07-10
ATE154148T1 (de) 1997-06-15

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