EP0082821A1 - Mit Detektionsmitteln zur Zeigerpassage an einer Referenzstelle vorbei ausgerüstete elektronische Uhr - Google Patents

Mit Detektionsmitteln zur Zeigerpassage an einer Referenzstelle vorbei ausgerüstete elektronische Uhr Download PDF

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Publication number
EP0082821A1
EP0082821A1 EP82810548A EP82810548A EP0082821A1 EP 0082821 A1 EP0082821 A1 EP 0082821A1 EP 82810548 A EP82810548 A EP 82810548A EP 82810548 A EP82810548 A EP 82810548A EP 0082821 A1 EP0082821 A1 EP 0082821A1
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EP
European Patent Office
Prior art keywords
mobile
signal
detection
hand
optical device
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
EP82810548A
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English (en)
French (fr)
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EP0082821B1 (de
Inventor
René Besson
Alphonse Bron
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ETA SA Manufacture Horlogere Suisse
Ebauchesfabrik ETA AG
Original Assignee
Ebauchesfabrik ETA AG
Eta SA Fabriques dEbauches
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Publication of EP0082821A1 publication Critical patent/EP0082821A1/de
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Publication of EP0082821B1 publication Critical patent/EP0082821B1/de
Expired legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G7/00—Synchronisation

Definitions

  • the present invention relates to an electronic watch provided with means for detecting the passage of a needle through a reference position.
  • the invention relates to an electronic watch with hands which comprises electro-optical means for locating in time the passage of a hand or of several hands through a reference position.
  • a time base delivers hourly pulses which are used to control a motor, which drives the hands via a gear train.
  • the constant duration of the driving pulses is adjusted to a value such that, taking into account the voltage delivered by the battery, the electric energy supplied to the motor at each pulse is sufficient to advance the hands by one step even in the phases drive a date disc, if the watch has one. At least this is true as long as the battery voltage remains above a given threshold. Therefore, if the battery is in good working order, with each time pulse delivered by the time base, the time display members progress by a corresponding amount.
  • At least one of the hands used to display the time can be used to display other information such as the date, the day of the week, etc.
  • the motor is supplied on demand by motor pulses. particular which allow to bring one or more hands in front of graduations of the dial in order to display one of the non-hourly information.
  • These motor pulses which no longer have anything to do with time pulses are counted in motor pulse counters.
  • the hourly pulses are stored in counters associated with the time base.
  • comparators compare the hourly information and the information contained in the motor pulse counters.
  • the normal duration of the driving pulses is determined in such a way that the energy contained in each pulse is sufficient to advance the hands by a corresponding number of steps, but insufficient when the torque which the motor must supply increases, for example when training the date disc.
  • the duration of the motor pulses must be increased when this torque increases.
  • Another detection method consists in periodically checking whether a needle, for example the needle of the seconds, passes well through a reference position, at the instant of appearance of the driving impulse associated with the time information corresponding to this position. In the latter case, it is therefore necessary to be able to locate - I position of a hand at these precise times provided by the time base of the watch.
  • a first type of detector used is constituted by a cam which rotates in synchronism with one or more needles thanks to a mechanical connection between these members.
  • the cam for a precise angular position, closes an electrical contact which in turn controls the emission of an electrical pulse.
  • the advantage of such a detector is that it is simple, but it is imprecise and unreliable. Furthermore, it can only be used with a unidirectional motor and it increases the energy which the motor must supply.
  • the watch includes a light-emitting diode which emits a light beam passing through a window on the dial.
  • the needle carries on its inner face a mirror. When the needle is in the reference position, the mirror reflects the light beam towards a photo-transistor which thus detects the passage of the needle through the reference position.
  • the resolution of such a system is poor and its implementation unattractive.
  • a first object of the invention is to provide an electronic watch with hands comprising an electro-optical detector of the passage of a needle through a reference position which makes it possible to obtain an improved resolution and a high reliability.
  • a second object of the invention is to provide such a watch which moreover comprises means for comparing the instant of the passage of the needle by the reference position with the instant when this passage must take place in view of a information internal to the watch, preferably the internal time of the watch, and to compensate for the advance or possible delay of the hands relative to the internal time of the watch, or the internal information.
  • the part of the watch concerned by the invention essentially comprises an optico-mechanical detection assembly which makes it possible to detect the passage of a hand through a reference position and a circuit associated with the normal circuit of the watch which makes it possible to operate the information supplied by the detector to possibly correct the position of the hand in the event of desynchronization between the position of the hand and the internal time of the watch given by the time base or other internal information.
  • the invention can be applied to watches whose hands are driven by a single motor, or to watches whose hands are driven by two motors, each motor driving for example a hand.
  • each motor driving for example a hand.
  • the detector comprises a movable part constituted by the mobiles 6 and 8.
  • the mobile 6 is integral in rotation with an axis 10 pivotally mounted in the frame and which further carries a toothed pinion 12 meshing with the rest of the gear train driving the needles.
  • the driving mobile 6 has a first part 6a in the form of a disc which is provided on its periphery with a driving finger 14.
  • the driving mobile has a second part 6b also in the form of a disc whose diameter is smaller to that of portion 6a.
  • the portion 6b is provided on its periphery with a notch 16 admitting as an axis of symmetry a radius which is at the same time the axis of symmetry of the finger 14.
  • the detection mobile 8 also comprises a first portion 8a provided over its entire periphery n teeth 18 which can cooperate with the finger 14.
  • the mobile 8 also comprises a second portion 8b also having the shape of a disc whose diameter is greater than that of the portion 8a.
  • the entire periphery of the portion 8b is provided with n portions of concave cylindrical surfaces 20 separated from one another by edges 22. Each concave portion has the same plane of symmetry as the tooth 18 which is associated with it.
  • the mobile 8 comprises a single orifice 24 in which a mirror 26 is driven out, the reflecting face 26a of which is a spherical cap or preferably a cap slightly oval spherical. As shown in FIG. 2, the center of the mirror is arranged on a radius constituting an axis of symmetry for one of the teeth 18. The assembly of the mobile 8 is secured to an axis 28 pivotally mounted in the frame 2.
  • the portions 6a and 8a are arranged at the same level.
  • the same goes for portions 8b and 6b.
  • the radius of the portion 6b of the mobile 6 is substantially equal to that of the cylinder defining the portions of cylindrical surfaces 20 of the mobile 8. It is easily understood that, during the meshing phases, the finger 14 acts on one of the teeth 18 and drives the rotation of the mobile 8 by an angle which is worth . This rotation is possible thanks to the fact that, during the drive phase, an edge 22 can temporarily penetrate into the notch 16.
  • the cooperation of the lateral surface of the portion 6b of the mobile 6 with a cylindrical portion 20 of mobile 8 rotatably locks mobile 8 while allowing free rotation of mobile 6.
  • the detection assembly further comprises a light source 30 preferably constituted by a light emitting diode in the infrared and a light sensor 32 constituted for example by a photo-transistor. These components are fixed on a support 34 and electrically connected by electrical connections symbolized by 36 to a printed circuit 38 fixed on the support 34.
  • the printed circuit 38 is connected to the integrated circuit of the watch by any suitable means.
  • the link 36 represents the supply conductors of the light-emitting diode 30, the polarization conductors of the photo-transistor 32 (or of the photodiode) and the conductors for collecting the signal delivered by the light detector (photo-transistor) in response to the light beam applied to it.
  • the detection assembly 30, 32 is for example placed in a housing 40 closed by the transparent plate 42.
  • a window 44 is provided in the frame 2 to allow the passage of incident and reflected light beams. It clearly appears that the light detector 32 receives a light signal only if the light-emitting diode 30 is energized and the mirror is placed opposite the light emitter 30 so that it returns to the detector 32 a significant part of the incident light beam.
  • the mobile 8 has an outside diameter of 4 mm, which does not occupy an important place in the watch.
  • the reflecting surface 26a of the mirror 26 which is a spherical cap has a diameter of 1 mm.
  • the motor driving the minute and hour hands makes 120 steps per hour, that is to say per dial turn of the minute hand.
  • the mobile 8 making 15 steps per revolution, that is to say per hour, the mobile 6 must make one revolution every four minutes, that is to say one revolution for eight steps of the engine.
  • the mobile 6 must be mounted in the gear train in such a way that it effectively has this speed of rotation.
  • the mirror 26 is therefore moved every four minutes, ie every eight steps from the engine.
  • the duration of the meshing phase between the mobiles 6 and 8 corresponds to two steps of the engine in the example considered.
  • the engagement time could be equal to one step of the motor.
  • the fact that the mobile 8 takes only 15 steps instead of 120 per revolution of the needle represents a very important advantage for the resolution of the system, while making it possible to limit the diameter of the mobile 8.
  • a diameter of the reflecting surface 26a of the mirror it is possible to reduce the diameter 0 of the circle on which the mirror is centered, since by reducing the number of steps made by the mobile 8 per revolution, the angle at the center between two successive positions is increased from the center of the mirror.
  • the assembly constituted by the mobiles 6 and 8 therefore behaves like a mechanical amplifier of rotation with respect to the devices of the prior art. This improves the resolution of the needle position detection without increasing the size of the mechanical part of the detection device.
  • n must be strictly greater than or equal to two for there to be detection. In fact it must be significantly greater than two for the lock between the mobile 6 and 8 is technologically possible.
  • n must be less than p for there to be an amplification effect. In fact, for there to be an improvement in the resolution, the number n must be significantly less than p.
  • the passage of the mirror 26 in front of the optical detector corresponds to q different positions of the needle.
  • Such a detector therefore does not allow the position of the needle to be initialized.
  • Figures 3a and 3b illustrate two variants of the optical system of Figure 1.
  • the mirror 26 is replaced by a diaphragm 26 'formed in the mobile 8.
  • the transmitter and receiver 30 and 32 are arranged on either side of the mobile 8 and are coaxial.
  • the detector 32 and the transmitter 30 are arranged side by side and on the same side with respect to the mobile 8.
  • the mobile 8 is pierced with a diaphragm 26 'and an identical concave mirror 26 " to the mirror 26 of FIGS. 1 and 2 is placed facing the emitter and the detector, the mirror 26 "and the detection - emitter assembly being arranged on either side of the mobile 8.
  • the transmitter and the receiver are fixed and an optical device constituted by a mirror or a diaphragm is secured to the mobile 8, this device allowing the light beam to reach the detector only if it occupies a corresponding angular position. when the needle passes through the or through a reference position.
  • the operation of the actual detector is obvious from the preceding description. While the light-emitting diode 30 is supplied, it emits a light beam towards the mobile 8. As long as the mirror 26 is not opposite the emitter 30, the photo-transistor receives no light or at least no significant light level . It therefore does not deliver any detection signal. On the contrary if the mirror is in front of the transmitter 30, the receiver 32 receives a reflected light beam of significant level and it delivers a detection signal.
  • FIGS. 8a and 8b illustrate alternative embodiments of the detector in the case where the detection is carried out when two watch hands occupy a determined position, for example when the hour hand and the minute hand both occupy the 12 o'clock position on the dial.
  • the detector comprises a second mobile 8 ′ having the same axis of rotation as the mobile 8 and which is kinematically linked to the movement of the hour hand.
  • the mobile 8 makes one revolution per revolution of the minute hand while the mobile 8 'makes one revolution or half a revolution per revolution of the hour hand.
  • the two hands are in the 12 o'clock position or for two needles passing through the 12 o'clock position.
  • a distinction is made between noon and midnight.
  • the mobile 8 ′ makes a turn when the needle associated with it makes m turns (m ⁇ 3).
  • the mobile 8 has a mirror 27, the active face 27a of which is concave and faces the mobile 8 '.
  • the mobile 8 ' is provided with a hole 29, the center of which is located at the same distance from the axis of rotation as that of the mirror 27.
  • the light source 30 and the light detector 32 are found, which are fixed relative to the watch case.
  • the mobile 8 ' is mounted between the mobile 8 and the transmitter-receiver assembly 30-32. It is easily understood that, as long as the mobile 8 ′ is not in the reference position, the mobile 8 receives no light. When the orifice 29 is at least partially vis-à-vis the transmitter, the mobile 8 receives light, but this is not reflected.
  • the mirror 27 and the hole 29 are superimposed and arranged with respect to the light emitter.
  • the portion of the face 8'a which passes in front of the transmitter 30 is provided with ridges 31 which return the light emitted by the emitter 30 out of the sensitive face of the receiver.
  • Figure 8b shows another embodiment of the optical system.
  • the mobile 8 has on its periphery a support 33 for a concave mirror 35 corresponding to a reduced sector of the mobile 8.
  • the mobile 8 ′ carries on a reduced sector of its periphery a second concave mirror 37.
  • Their optical parameters are such that, in this configuration, and in this configuration alone, the beam emitted by the light source 30 is returned to the receiver 32.
  • the detection could also be done from the position of the minute hand and that of the seconds.
  • the engagement time between the mobiles 6 and 8 corresponds to two steps of the motor. Between these two steps, the position of the mobile 8 is uncertain. More generally, the engagement time T is x. t, x being an integer and t the time taken by the needle to cross a step. In the particular case described x is equal to 2. On the other hand the motor makes 120 steps per hour for the minute hand.
  • Motor impulses are alternately positive and negative. It is very possible to foresee that an even driving impulse (positive impulse) brings the minute hand on a scale of the minutes and that a negative driving impulse brings the hand of the minutes in an intermediate position between two minute graduations. Likewise, it is very possible to predict that the end of an engagement phase of the mobiles 6 and 8 coincides with a positive driving impulse. Of course the reference position is chosen to coincide with a scale of the minutes, for example the zero scale. Consequently, it suffices to supply the transmitter 30 with a time t 0 after each positive driving pulse.
  • Figures 7a and 7b illustrate the control of the transmitter 30, I o and Il representing two respectively positive and negative driving pulses. In normal operation they are offset by 30 seconds. Their duration is for example of the order of 5 ms. J represents the supply pulse of the diode. This pulse lasts for example 1 ms, and the offset t is worth 12 ms. Thus the number of times that the diode is supplied is reduced, and the duration of each supply period is short. In the following description, the signal delivered by the detector 32 will be given the value 1 when the mirror 26 is opposite the transmitter 30 and the value zero otherwise.
  • Detection is carried out at each normal revolution of the minute hand.
  • the emitting diode 30 is supplied at the instants 59 minutes and 60 minutes defined by the time base of the watch, the reference position being the zero graduation. This gives a number of two binary digits, the one on the right giving the value of the detection signal at the 60th minute and the one on the left the value of the signal at the 59th minute.
  • the hand is late or advances at least 5 minutes. Indeed, the mirror only rotates every eight motor steps, that is to say every four minutes.
  • the needle is one, two or three minutes early. The fact that there are three possible values is due to the fact that the mobile 8 only moves every four minutes.
  • FIG. 4 shows the general organization of the part of the circuit of the watch which makes it possible to readjust the position of the hand minutes on the internal time given by the time base of the watch.
  • the oscillator 40 of the watch which conventionally delivers a periodic signal, for example, at 32,768 Hz.
  • This signal is introduced into a frequency generator 42 which can deliver at least one periodic signal.
  • this signal has a frequency of 1/30 Hz or 64 Hz.
  • the periodic signal is applied to the input of the forming circuit 44 or "driver" which applies to the stepper motor 46 alternating driving pulses to said frequency.
  • the motor 46 drives one or two hands 48, 48 ′ which serve, for example, to display the minute and the hour, by means of a gear train symbolized by 50.
  • the gear train 50 also drives the transmission mobile 6. This advances the detection mobile 8 which carries the mirror by one step every four minutes.
  • the transmitter 30 is controlled by a supply circuit 52 which determines the moment of excitation of the transmitter 30 and the duration and the shape of the excitation pulse (for example 1 ms).
  • the current or voltage delivered by the detector 32 is shaped in the circuit 54 to deliver a logic signal S.
  • the signal S has the value 1 if the mirror is opposite the transmitter assembly -receiver and the value 0 otherwise.
  • a logic circuit bearing the general reference 56 controls the implementation of the method for synchronizing the position of the minute hand with the internal time of the watch given by the frequency generator 42.
  • the logic circuit 56 receives on its inputs 56a and 56b the logic signal S and the periodic signal delivered by the frequency generator 42. It delivers on its output 56 ′ a signal for controlling the frequency delivered by the generator 42 and on its output 56'b a control signal from the supply circuit 52.
  • FIG. 5 shows in more detail the organization of logic circuit 56 and the various associated circuits.
  • the frequency generator 42 is constituted by several division stages 60. They deliver on their output 60a a signal of frequency 1/30 Hz used for the normal control of the motor and on their output 60b a signal of frequency 64 Hz allowing to drive the engine at high speed.
  • the outputs 60a and 60b are connected to the forming circuit 44 by a controllable switch 62. It goes without saying that the switch 62 is in fact produced by semiconductor elements, for example complementary MOS transistors.
  • the logic circuit 56 comprises a counter by 120 referenced 64 which receives on its clock input 64a the frequency signal 1/30 Hz.
  • the counter 64 delivers on its output 64a a pulse each time it has counted 120 applied pulses at its clock input.
  • the counter 64 is associated with a comparator 66 which constantly compares the state of the counter 64 with the value 118.
  • the comparator delivers a signal on its output 66'a when the content of the counter 64 changes to 118. It is easily understood that the comparator 66 delivers a signal for each 59th minute, and that the counter 64 delivers a pulse for each 60th minute.
  • the outputs 64'a and 66'a are connected to two inputs of an OR gate 68.
  • the output of the gate 68 drives a circuit 70 for controlling the supply circuit 52 of the transmitter 30.
  • the circuit 56 also includes a shift register 72.
  • the register 72 is supplied by the output of the shaping circuit 54 of the signal delivered by the receiver 32 through the delay circuit 73 whose time constant is of the order 1 ms. It also includes a reset input 72a.
  • the comparator 71 is activated only when the signal delivered by the comparator 66 appears. Its purpose is therefore only to compare the value of the signal S resulting from detection at the 59th minute. It delivers a signal on its output 71a if its input is zero.
  • the register 72 is associated with a digital comparison circuit 74 which compares the state of the register 72 with the number 01 at the times when the transmitter is supplied.
  • circuit 74 delivers a signal on its output 74a, and if not, it delivers a signal on its output 74b. It is clear that the purpose of register 72 is to store the last two values of the detection signal 5.
  • the output 74b of the comparator 74 is connected to an input of an OR gate 76 via the blocking circuit 78. The purpose of this circuit is to allow only one pulse applied to its input 78a to pass unblocking pulse is not applied to its control input 78b. This control input 78b is connected to the output 66'a of the comparator 66.
  • the OR gate 76 receives on its second input the signal delivered by the comparator 71, and the output of the gate 76 is connected to the reset input at zero 72a of register 72.
  • the switch 62 is controlled by a circuit 80.
  • the circuit 80 delivers a level 0 signal which brings the switch 62 into the position 0 if a signal is applied to its input N. It delivers a level 1 signal which brings the switch 62 to position 1 if a signal is applied to its input R.
  • the trainer circuit 44 receives pulses of high frequency 64 Hz.
  • the logic circuit 56 also includes a parity detector 82 which is connected to the output 60b of the divider 60. It does not allow the pulse applied to its input only if it is of even rank, that is to say if it controls the application to the motor of a positive driving impulse.
  • the output of the detector 82 is connected on the one hand to an input of the OR gate referenced 68 and on the other hand to the clock input 84a of a counter by 60 referenced 84.
  • the counter 84 has an input reset 84b.
  • the input 84b is connected to the output of the control circuit 80 so that the counter 84 is kept at zero as long as the circuit 80 maintains the switch 62 in the position 0. In other words the counter 84 does not count the even pulses of the signal at 64 Hz only when these are applied to the forming circuit.
  • the output 84c of the counter 84 which delivers a pulse each time 60 even pulses have been counted, is connected to an input of an OR gate referenced 86 whose output is connected to the input N of the control circuit 80.
  • This output is also connected to the power supply control circuit 70 of the transmitter to then prohibit the supply of power to the transmitter.
  • the other input of gate 86 is connected to the output 74a of the comparator 74 via the calculation circuit 88.
  • the output 74b of the comparison circuit 74 is connected to the input R of the control circuit 80 of the switch 62.
  • the operation of the circuit in FIG. 5 will be explained using the flow diagram in FIG. 6.
  • the normal pulses at 1 / 30th of Hz counted by the counter 64 are compared to the value 118 by the test referenced 100 ( comparator 66). If the rank of the pulse is different from 118, it is compared to 120 by test 102 (counter 64). If the rank is also different from 120, we return to the entry for test 100. This means that the 59th minute has not yet been reached. If the rank of the pulse is equal to 118, at 104 the register 72 is set to zero (the content of which is called SR in the flowchart) and the transmitter 30 is supplied. The value of the signal S delivered by the detector 32 is loaded into the register 72 at 106.
  • step 102 the sensor is supplied with 112 and the value of the signal S delivered by the detector 32 is entered in register 72 during step 114.
  • step 116 we compare the content SR of register 72 to 01, which is done by comparator 74. If SR is 01 we return to operation 100. Indeed, this means that the minute hand is in phase with the internal time of the watch. If on the contrary SR is different from the value 01, we go to operation 110 which consists in resetting the register 72 to zero. This operation is performed by the gate 76 and by the circuit 78 which is not blocked since it is the first time that a comparison is made.
  • SR As SR is different from 01, a signal is applied to input R of the control circuit of the switch 62. These are therefore pulses at 64 Hz which are applied to the forming circuit 44. These operations are symbolized by the references 118 and 120 in FIG. 6.
  • the parity of the fast pulse is tested (circuit 82). If the pulse is odd we return to operation 120. If the pulse is even, its rank is compared to 60 during operation 124. Concretely this comparison is made by the counter 84. If the rank is equal to 60 we return to the start operation 100. This means that the needle position error has not been corrected, but that the correction is nevertheless stopped so as not to drain the battery. This instruction results in the fact that the circuit 80 receives a signal on its input N. The pulses at 1/30 Hz are therefore again applied to the motor. If the rank of the even pulse is less than 60, the transmitter 30 is supplied (operation 126) and the value of the corresponding signal S is loaded into the register 72 at 128.
  • This new content is compared to the value 01 (operation 130). This is achieved by the comparator 74. If the content is different from 01 we return to operation 120, that is to say that a new fast pulse is processed. As this is not the first comparison, the circuit 78 is blocked and the register 72 is therefore not reset. On the other hand, it is always the fast pulses which are applied to the forming circuit 44 since it is on its input R that the control circuit 80 receives a pulse. If on the contrary the content of 72 is equal to 01, the circuit 80 receives a pulse on its input N. It is therefore again pulses of normal frequency which are applied to the forming circuit.
  • Circuit 88 calculates the number N of pulses to be applied to the motor to exactly put the hand in phase with the internal time of the watch (operation 132).
  • the high frequency is equal to 64 Hz
  • the correction lasts a maximum of 2 seconds.
  • the minute hand must therefore remain on the graduation 60.
  • the calculation circuit 88 is therefore not useful, and N is zero.
  • the time signal can have a frequency of 2 Hz. If the high frequency signal has a frequency of 64 Hz, the correction may require 120 motor steps, this correction can take approximately 2 seconds. During this time, the generator 60 has delivered several time pulses, so the hand must no longer occupy position 0 but another position.
  • the circuit 88 calculates the number N of hourly pulses delivered and sends N additional rapid pulses to the trainer circuit 44. It should be added that the optical detection is carried out every two periods of the signal delivered by the frequency generator 42, whether it act of the signal at 1 / 30th Hz or of the signal at 64 Hz. More generally if the engagement time of the two mobiles 6 and 8 corresponds to x pitch of the motor, detection will be carried out every x periods of the periodic signal actually applied to the motor (1 / 30th of Hz or 64 Hz).
  • the control is done when the needle is driven at its normal speed, that is to say by pulses at 1 / 30th of Hz.
  • a needle or the hands it is known to use a needle or the hands to display information other than the present time. You can display a wake-up time, date, month, etc.
  • the watch includes memories which contain information representative of the position that the needle must occupy to display the selected information.
  • one solution is to apply rapid pulses to the motor, for example at 64 Hz.
  • the number of pulses to be applied is determined from the content of the memory storing the position of the information to display and the content of the present time counters.
  • the needle can pass through the reference position. It is interesting to check the actual position of the needle with its theoretical position during this fast-running phase. It is easy to see that the problem has not changed significantly.
  • the difference lies first in the fact that the correction signal to be applied if necessary and the motor control signal have the same frequency. It doesn't matter. Then the difference lies in the way in which the moments when the control must be carried out are elaborated.
  • circuit of FIG. 5 is only an example of embodiment using discrete logic circuits.
  • the flow diagram of FIG. 6 shows that the circuit 56 could just as easily be produced using a microprocessor.
  • the actual detector effectively solves the problem of locating the position of the hand in a watch. It has good resolution, that is to say that there is no risk of detection error between two successive angular positions. However, the whole detector has reduced dimensions which make it easily accommodatable in the movement of the watch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Electric Clocks (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP82810548A 1981-12-23 1982-12-17 Mit Detektionsmitteln zur Zeigerpassage an einer Referenzstelle vorbei ausgerüstete elektronische Uhr Expired EP0082821B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH824381A CH646301GA3 (de) 1981-12-23 1981-12-23
CH8243/81 1981-12-23

Publications (2)

Publication Number Publication Date
EP0082821A1 true EP0082821A1 (de) 1983-06-29
EP0082821B1 EP0082821B1 (de) 1987-03-18

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EP82810548A Expired EP0082821B1 (de) 1981-12-23 1982-12-17 Mit Detektionsmitteln zur Zeigerpassage an einer Referenzstelle vorbei ausgerüstete elektronische Uhr

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US (1) US4420263A (de)
EP (1) EP0082821B1 (de)
JP (1) JPS58150881A (de)
CH (1) CH646301GA3 (de)
DE (1) DE3275765D1 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2568029A1 (fr) * 1984-07-19 1986-01-24 Hatot Leon Ets Installation de transmission de donnees, notamment pour la distribution de l'heure, emetteur et recepteur pour cette installation
EP0180880A2 (de) * 1984-11-09 1986-05-14 Junghans Uhren Gmbh Anzeigestellungs-Detektionseinrichtung für eine Uhr, insbesondere eine Funkuhr
EP0185160A2 (de) * 1984-12-21 1986-06-25 Audi Ag Funkgesteuerte Uhr
EP0108711B1 (de) * 1982-10-13 1987-06-10 Eta SA Fabriques d'Ebauches Verfahren und Vorrichtung zur Steuerung eines Schrittmotors
GB2197968A (en) * 1986-11-21 1988-06-02 Europ Electronic Syst Ltd Analogue clock
EP0308879A2 (de) * 1987-09-23 1989-03-29 Junghans Uhren Gmbh Zweimotoren-Räderwerk, insbesondere für eine Funkuhr
DE4311065C1 (de) * 1993-04-03 1994-02-17 Braun Ag Verfahren und Vorrichtung zur Positionserkennung von Anzeigeelementen
GB2272309A (en) * 1992-11-10 1994-05-11 Seikosha Kk Clock movement.
FR2728087A1 (fr) * 1994-12-13 1996-06-14 Gorgy Timing Procede et dispositif de fonctionnement d'une horloge et horloge munie de ce dispositif et mettant en oeuvre ce procede

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CN101395543B (zh) * 2006-03-03 2010-08-25 西铁城控股株式会社 模拟电子表
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EP0185160A2 (de) * 1984-12-21 1986-06-25 Audi Ag Funkgesteuerte Uhr
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EP0308879A3 (de) * 1987-09-23 1991-03-27 Junghans Uhren Gmbh Zweimotoren-Räderwerk, insbesondere für eine Funkuhr
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FR2728087A1 (fr) * 1994-12-13 1996-06-14 Gorgy Timing Procede et dispositif de fonctionnement d'une horloge et horloge munie de ce dispositif et mettant en oeuvre ce procede

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JPS6336478B2 (de) 1988-07-20
JPS58150881A (ja) 1983-09-07
CH646301GA3 (de) 1984-11-30
DE3275765D1 (en) 1987-04-30
US4420263A (en) 1983-12-13
EP0082821B1 (de) 1987-03-18

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