US3855781A - Step motor mechanism for electronic timepiece - Google Patents

Step motor mechanism for electronic timepiece Download PDF

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Publication number
US3855781A
US3855781A US00427208A US42720873A US3855781A US 3855781 A US3855781 A US 3855781A US 00427208 A US00427208 A US 00427208A US 42720873 A US42720873 A US 42720873A US 3855781 A US3855781 A US 3855781A
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United States
Prior art keywords
step motor
driving
electronic timepiece
signals
wheel
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Expired - Lifetime
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US00427208A
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English (en)
Inventor
H Chihara
Y Ushiyama
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Suwa Seikosha KK
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Suwa Seikosha KK
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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
    • 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
    • G04C3/143—Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g. detection of unwanted or missing step

Definitions

  • a step motor driving mechanism for use in an electronic timepiece and especially suitable for reducing the current consumption thereof is provided.
  • Means are provided for detecting the rotational position of a step motor and controlling the current applied thereto during a loaded and unloaded condition.
  • the detecting means is coupled to the driving and control circuit to reduce the pulse width or peak value of the current applied to the step motor during the unloaded condition thereof to thereby reduce the current necessary to drive same.
  • This invention relates generally to a step motor driving mechanism in an electronic timepiece and especially to a step motor driving circuit for reducing the current required to drive same.
  • electronic timepieces have become popular, the demand for small sized and thin electronic Wristwatches has increased.
  • the use of quartz crystal oscillators in such electronic Wristwatches to produce a time base has helped reduce the size of such watches.
  • an electronic timepiece having a step motor for driving the gear train including pulse generator means for generating a high frequency time standard signal, divider means formed from a plurality of series connected divider stages producing low frequency timing signals in response to said high frequency time standard signal and representative of present time, and a driving control circuit for driving the step motor and reducing the electric current consumed in driving the step motor.
  • a detection circuit is provided for detecting whether the step motor is in a loaded or unloaded state and upon detecting an unloaded condition, causing the driving control circuit to limit the amount of current used to drive the step motor. Accordingly, it is an object of this invention to provide an improved small-sized electronic timepiece wherein the current required to drive the step motor is minimized.
  • Still another object of this invention is to provide a step motor drive mechanism for use in an electronic timepiece which is capable of considerably decreasing the current consumption thereof.
  • Still another object of this invention is to provide an improved small-sized electronic timepiece wherein the size of the battery required to drive same can be reduced considerably.
  • FIG. 2 is a graphical representation of two' curves corresponding to the current utilized by a step motor of the type depicted in FIG. 1 in an unloaded and loaded condition;
  • FIG. 3 is a circuit diagram of an electronic timepiece circuit constructed in accordance with the prior art
  • FIG. 4 is a circuit diagram of an electronic timepiece including step motor driving and control circuit and is constructed in accordance with the instant invention
  • FIG. 5 is a circuit diagram of still another electronic timepiece including a step motor driving and control circuit and constructed in accordance with an alternative embodiment of the instant invention
  • FIG. 6 is a plan view of a step motor constructed in accordance with the circuit depicted in FIG. 4;
  • FIG. 7 is a circuit diagram of the driving control circuit depicted in FIG. 4;
  • FIGS. 8a, 8b and 8c are wave diagrams corresponding to circuit of FIG. 7;
  • FIG. 9 is a wave diagram of the timing signals corresponding to the circuit of FIG. 7;
  • FIG. 10 is a plan view of a step motor mechanism in accordance with the embodiment of the invention depicted in FIG. 5;
  • FIG. 11 is a circuit diagram of the control and driving circuit depicted in FIG. 5;
  • FIG. 12 is a plan view of a mechanical gear train constructed in accordance with still another alternative embodiment of the instant invention.
  • FIG. 13 is a circuit diagram of the circuit and driving control circuit used in combination with the gear train mechanism illustrated in FIG. 12.
  • FIG. 1 a step motor used in an electronic timepiece and comprising a permanent magnet rotor 1, and high permeability stators 2 and 3 being driven by a driving coil 4 is depicted.
  • the step motor is rotated in a single direction by applying the alternating current pulses 5 to the driving coil 4.
  • a nonloaded condition is the condition in an electronic timepiece where the load of the step motor is merely a gear train of the timepiece and the load is substantially equal to zero.
  • the loaded condition occurs in an electronic timepiece when the step motor is under a load such as when a calendar indicator is advanced. It is appreciated from a comparison of curves a and b, in FIG. 2 that the driving current (driving current peak current (i,) X pulse width 7) differs according to the presence or absence of a load on the step motor.
  • the step motor is driven at a definite peak current i and at a specific pulse width 7,, resulting in a very inefficient use of current.
  • a pulse width 1 is needed to drive same.
  • the step motor is not under a load condition the rotor is rotated at a time which is considerably earlier than 1
  • the current during 1-,, t 1 (which is slightly greater than half of the current used between zero and 7 has been wasted when the step motor is in a non-loaded condition.
  • Such a waste of current in driving a non-loaded step motor is significant in view of the loaded, is a waste of more than half the current applied thereto, and hence reduces the life of the battery in an electronic timepiece.
  • a driving and current control circuit is provided to control the pulse width or peak value of the driving current in response to the presence or absence of a laod on a step motor so that the driving current of the step motor is minimized during no load conditions and is maximized when the motor is loaded.
  • FIG. 4 wherein an electronic timepiece circuit which is adapted to control the driving current of the step motor drive signals is illustrated.
  • an oscillator provides a high frequency signal to a dividing circuit comprised of multi-stage counters which supply a low frequency signal to a driving circuit.
  • the driving circuit applies an alternating drive signal to the step motor which is actuated and drives the gear train of the electronic timepiece.
  • a comparison of the circuit depicted in FIG. 4 with the'prior art circuit depicted in FIG. 3 shows that applicant has provided a load detection mechanism and a driving and control circuit which will, as hereinafter be pointed out, control current applied to the step motor in response to a loaded and unloaded condition. As illustrated in FIG. 2, the time in which the rotor is rotated is different depending on whether the step motor is loaded or unloaded.
  • the pulse width of the current signal applied to the step motor will correspond to the loaded or unloaded condition of the step motor.
  • FIGS. 6 and 7 A preferred embodiment of the circuit of FIG. 4 is illustrated in FIGS. 6 and 7 wherein a step motor and a drive and control circuit corresponding to the circuit depicted in FIG. 4 are respectively illustrated, like reference numerals denoting like elements.
  • the step motor includes a detection coil 6 which is adapted to detect the rotational angle of the rotor.
  • the detection coil 6 is coupled through a two-direction wave rectifier circuit 7 in order to insure that the detection signals are undirectional.
  • a differentiation and inverter circuit 8 receives the unidirectional signals and provides a signal which is usually of a low voltage state and is at a high voltage state at the time the rotor rotates to the angular position which is detected.
  • the signal at the output of the inverter of circuit 8 shaped by applying same to a one-shot single state multivibrator which applies the shaped signal to the inverter 10 so that the output thereof is usually at a high voltage.
  • the pulse width of of the driving current is controlled by the NAND gate circuit 11 which is adapted to control the time standard signals IN 1 and IN 2 provided from the divider circuit at terminals 13 and 14.
  • the time carrying signals IN 1 and IN 2 which are gated by each of the NAND gates and are inverted by supplying same to the inverters of circuit 12, are in turn applied to the drive coil 4 of the motor as an alternating pulse driving signal. It is appreciated that all the elements of the circuit depicted in FIG. 7 could be constructed from complementary field effect transistors, and therefore monolithically integrated on a single circuit chip.
  • FIGS. 8 and 9 illustrate the operation of the embodiment depicted in FIGS. 6 and 7,
  • the driving current is supplied to the step motor to drive same.
  • a detection signal as is illustrated in FIG. 8a is induced in the detection coil and is applied to the gate of the inverter and differential circuit 8 the signal at the inverter being illustrated in FIG. 8b.
  • the voltage in the detection coil decreases.
  • the gate voltage of the inverter of circuit 8 is lowered to the threshold voltage V by the differential circuit, and the signal at the output of the inverter of circuit 8 becomes a high voltage signal. Accordingly, the output S of the inverter circuit 10 is inverted to a low voltage signal and consequently, both NAND gate outputs of the NAND gate circuit 11 become high voltage signals to thereby interrupt the driving current. Accordingly, in accordance with this embodiment, the current consumed is remarkably decreased, because the driving current in the driving coil 4 is applied in response to a time signal and the time signal is interrupted when the rotor rotates through a specific angle of rotation. Thus, the pulse width of the signals applied to the drive coil are changed in a manner which is highly sensitive to and responsive to the load condition of the step motor, to thereby utilize the minimum driving current necessary for driving the step motor.
  • the consumed current at no load conditions was of the order of 6.05 amps. when a drive signal having a fixed pulse width and a definite peak current were applied thereto, whereas a circuit constructed in accordance with the present embodiment reduces current consumption to less than half or 2.45 pamps, without any appreciable difference in the motors operation at maximum torque levels. Furthermore, since the control circuit current in a C-MOS construction is only 0.5 ramps, the total current consumed for both the oscillator and divider circuitry is reduced to about 6 uamps or two-thirds of the current (9 ptamps) consumed in prior art devices operating at the same levels, thus making use of a smaller sized battery possible or increasing the working life of the batteries utilized therein.
  • a control and driving circuit receives a signal from a load detection mechanism which is adapted to detect the mechanical position of a fourth wheel in the watch mechanism to provide a detection signal for reducing the pulse width of the step motor drive signals.
  • the detection mechanism senses signals from the gear train and apner.
  • a second jumper 16 for regulating the fluctuation of the second hand is coupled to a barium titanate decoder 17 which admits of an electrostriction effect to provide detecting signals.
  • the second jumper 16 is engaged with the fourth wheel and vibrates in accordance with the rotation of the rotor to detect the rotating angle of the rotor by detecting the voltage produced by the barium titanate decoder.
  • the detection coil 6 depicted in FIG. 6 is replaced by the barium titanate decoder coupled to the second jumper.
  • the method of controlling signals supplied to the drive coil is in every other respect the same as that of the embodiment illustrated by FIG. 4.
  • control and driving circuit includes the barium titanate decoder 17 coupled to an amplifier circuit l8 for amplifying the detection voltage produced by the decoder, the remainder of the circuit operating in the same manner as the circuit depicted in FIG. 7, like reference numerals denoting like elements. It is further possible to include a delay signal by designing the resistor 9b and the capacitor 9a to have a specific time constant when necessary or desired. It is noted that current consumption is reduced by more than 50 percent while the step motor continues to operate at maximum torque when practicing the instant invention according to this embodiment.
  • FIGS. 12and 13 wherein a system for controlling the driving current of the step motor by detecting a time zone disposed on a calendar advance wheel by providing a switching mechanism responsive to the gear train is depicted, it being noted that such embodiment is still another way of carrying out the circuit of FIG. 5.
  • a calendar wheel is advanced by a calendar advancing wheel 19 which is made of a conductive material andis connected to a conductive plate.
  • a ratchet member 21 is adapted to rotate the calendar wheel 20.
  • An insulator 22 is disposed on the calendar advancing wheel 19 and defines a non-loaded time zone.
  • a slider 23 is disposed in contact with the date advancing wheel.
  • the calendar advancing wheel 19, the insulator 22 disposed thereon, and the slider 23 form a switch mechanism for detecing the loaded time zone.
  • the switch mechanism 28 is the equivalent of the switching mechanism comprised of the calendar advancing wheel 19, the insulator 22 and the slider 23.
  • An inverter circuit 24 has a bias resistor 27 coupled to a first side thereof. The other side of the inverter 24 is coupled to a P-channel MOS field effect transistor which in turn is coupled to resistor 26 which controls the driving current, both the transistor 25 and the resistor 26 being coupled to the driving circuit 12 which is comprised of inverter stages. It is noted that the inverters are all of C-MOS construction and the input terminals IN 1 and IN 2 of the inverter 12 receive the time signals from the divider circuit which signals are of a definite period and pulse width.
  • the equivalent switch mechanism 28 is shown as an open circuit and represents a no load condition.
  • the output of the inverter 24 is a high voltage and in view thereof, the P-MOS transistor 25 is turned off. Since the driving control current resistor 26 is coupled in series with the driving coil 4, only driving currents having a small peak value are applied to the driving coil.
  • the slider 23 and the calendar advanc ing wheel 19 contact each other and render the equivalent switch closed or in an ON position.
  • the output of the inverter 24 is at a low voltage
  • the P-MOS transistor 25 is turned on to thereby short circuit the driving current resistor 26, thereby supplying a driving current having a large peak value through the driving coil 4 during the loaded condition. Accordingly, the pulse width of the applied signals remain fixed whether the step motor remains loaded or nonloaded and the peak value is adjusted.
  • the step motor need not be of the electromagnetic type but instead could be of the dynamo-electric type or any other which is utilized in an electronic timepiece. It is further noted, that in all of the embodiments of the instant invention, the driving current of the step motor is controlled by providing a load detection mechanism, but that an amplifier of sufficiently high sensitivity and which could operate on small amounts of current could be provided to detect the rotating angle of the rotor by converting the driving current into a voltage and amplifying the voltage. It would then be possible to control the driving current without providing a load detection mechanism.
  • An electronic timepiece having a step motor and comprising a quartz crystal vibrator producing a high frequency time standard signal; divider circuit means for producing low frequency time signals in response to said high frequency time standard signals; a gear train driven by said step motor and adapted to place the step motor in one of a loaded and unloaded conditions; load detection means for detecting the condition of the step motor and supplying a signal corresponding thereto; and driving and control means intermediate the dividing circuit and the step motor for receiving the low frequency signals from the dividing circuit and applying same to the step motor for driving same, the signals applied to the step motor being controlled by application of the load detection .signal to the driving and control circuit means.
  • said driving and control means includes circuit means for receiving the signal detected by the detection coil and using same to gate the low frequency time signals supplied by the divider to thereby reduce the pulse width thereof when the unloaded condition is detected.
  • the driving and control means includes an electronic switching element and said orientation sensing means providing a switching signal to the electronic switching element for controlling the peak value of the drive signal applied to the step motor.
  • said orientation sensing means includes a rotating conductive calendar advancing wheel, a sensing element adapted to provide said switching signal when said sensing element is in contact with said calendar advancing wheel, and insulator means disposed on part of said advancing wheel between said sensing element and said conductive wheel, the absence of the insulator on the calendar advancing wheel defining a loaded condition of the step motor.
  • An electronic timepiece having a step motor and comprising a quartz crystal vibrator producing a high frequency time standard signal; divider circuit means for producing low frequency time signals in response to said high frequency time standard signals; a gear train driven by said step motor and adapted to place a load on the step motor; load detection-means for detecting the load condition of the step motor and supplying a signal corresponding thereto; and driving and control means intermediate the dividing circuit and the step motor for receiving the low frequency signals from the dividing circuit and applying same to the step motor for driving same, the signals applied to the step motor being controlled by application of the load condition signal to the driving and control means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Control Of Stepping Motors (AREA)
US00427208A 1972-12-22 1973-12-21 Step motor mechanism for electronic timepiece Expired - Lifetime US3855781A (en)

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JP12892372A JPS5542356B2 (en, 2012) 1972-12-22 1972-12-22

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US (1) US3855781A (en, 2012)
JP (1) JPS5542356B2 (en, 2012)
GB (1) GB1425840A (en, 2012)
HK (1) HK4678A (en, 2012)
MY (1) MY7800077A (en, 2012)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984972A (en) * 1974-04-04 1976-10-12 Kabushiki Kaisha Suwa Seikosha Transducer for quartz crystal timepiece
US3992868A (en) * 1974-03-05 1976-11-23 Citizen Watch Co., Ltd. Timepiece with calendar mechanism
DE2745052A1 (de) * 1976-10-06 1978-04-20 Suwa Seikosha Kk Elektronische uhr
US4085577A (en) * 1975-07-02 1978-04-25 Citizen Watch Co. Ltd. Electronic timepiece
US4114364A (en) * 1976-01-29 1978-09-19 Kabushiki Kaisha Daini Seikosha Driving pulse width controlling circuit for a transducer of an electronic timepiece
FR2388325A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Dispositif de reduction de la consommation d'une montre electronique
FR2388326A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Dispositif de detection des conditions de rotation du moteur d'une montre electronique
FR2388324A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Montre electronique analogique a faible consommation
FR2388330A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Montre electronique
FR2388328A1 (en, 2012) * 1977-04-23 1978-11-17 Seiko Instr & Electronics
US4144467A (en) * 1973-11-30 1979-03-13 Citizen Watch Co., Ltd. Pulse motor
DE2841946A1 (de) * 1977-12-02 1979-06-07 Seiko Instr & Electronics Elektronische uhr
US4157647A (en) * 1976-07-21 1979-06-12 Kabushiki Kaisha Daini Seikosha Hand reversing system for an electronic timepiece
FR2435076A1 (fr) * 1978-06-20 1980-03-28 Ebauches Sa Procede pour reduire la consommation d'une piece d'horlogerie electronique et piece d'horlogerie electronique mettant en oeuvre ce procede
US4221111A (en) * 1978-08-15 1980-09-09 Citizen Watch Company Limited Electronic timepiece having a voltage conversion circuit
EP0021494A1 (fr) * 1979-06-28 1981-01-07 Eta A.G. Ebauches-Fabrik Montre électronique à affichage à aiguilles et à détecteur de rotation
EP0027856A1 (de) * 1979-09-19 1981-05-06 Braun Aktiengesellschaft Schaltungsanordnung zur Regelung von Drehzahl und Phasenlage bei Synchronmotoren
WO1981002207A1 (en) * 1980-01-30 1981-08-06 Portescap Electric motor control device
US4312059A (en) * 1977-04-23 1982-01-19 Kabushiki Kaisha Daini Seikosha Electronic timepiece
US4315329A (en) * 1978-09-12 1982-02-09 Kabushiki Kaisha Daini Seikosha Load measuring device for the gear train of a timepiece
DE3132304A1 (de) * 1980-08-25 1982-05-27 ETA S.A. Fabriques d'Ebauches, 2540 Granges "verfahren zum verringern des energieverbrauchs des schrittschaltmotors in einem elektronischen uhrwerk und elektronisches uhrwerk, bei dem das verfahren angewandt wird"
EP0057663A3 (en) * 1981-02-04 1982-08-18 N.V. Philips' Gloeilampenfabrieken Control device for stepping motor
US4361410A (en) * 1977-09-26 1982-11-30 Citizen Watch Company Ltd. Drive system for pulse motor
US4368990A (en) * 1977-04-23 1983-01-18 Kabushiki Kaisha Daini Seikosha Electronic timepiece
US4382691A (en) * 1977-03-16 1983-05-10 Kabushiki Kaisha Daini Seikosha Electronic watch
US4492905A (en) * 1979-10-31 1985-01-08 Pfister Jean Francois Intermittent drive arrangement
EP0874292A3 (en) * 1997-04-25 1999-03-03 Seiko Instruments Inc. Electronic timepiece
US6088302A (en) * 1997-04-25 2000-07-11 Seiko Instruments Inc. Electronic timepiece
US6262554B1 (en) * 1998-09-22 2001-07-17 Seiko Epson Corporation Electronic device and method of controlling the same
US20150123590A1 (en) * 2012-06-20 2015-05-07 Trinamic Motion Control Gmbh & Co. Kg Method and circuit assembly for driving a stepper motor
CN110083044A (zh) * 2018-01-26 2019-08-02 精工电子有限公司 机芯和钟表

Families Citing this family (11)

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JPS5010433A (en, 2012) * 1973-06-04 1975-02-03
JPS5199077A (ja) * 1975-02-26 1976-09-01 Seiko Instr & Electronics Denshidokeiniokerukudosochi
JPS51123186A (en) * 1975-04-18 1976-10-27 Seiko Instr & Electronics Ltd Electronic watch
JPS5243006U (en, 2012) * 1975-09-23 1977-03-26
JPS5389776A (en) * 1977-01-19 1978-08-07 Seiko Epson Corp Electronic wristwatch
JPS5482268A (en) * 1977-12-14 1979-06-30 Citizen Watch Co Ltd Electronic watch with alarm
JPS54133382A (en) * 1978-04-07 1979-10-17 Seiko Epson Corp Crystal wristwatch
JPS5696270A (en) * 1980-11-05 1981-08-04 Citizen Watch Co Ltd Electronic timepiece
JPH0228477Y2 (en, 2012) * 1981-07-06 1990-07-31
JPS61135288U (en, 2012) * 1985-02-13 1986-08-23
JPH0379469U (en, 2012) * 1989-12-05 1991-08-13

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US3512351A (en) * 1966-09-09 1970-05-19 Smiths Industries Ltd Electrical oscillation generators
US3553957A (en) * 1966-02-10 1971-01-12 Peter Dome Electronic timepiece
US3812670A (en) * 1971-09-25 1974-05-28 Citizen Watch Co Ltd Converter drive circuit in an electronic timepiece

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US3553957A (en) * 1966-02-10 1971-01-12 Peter Dome Electronic timepiece
US3512351A (en) * 1966-09-09 1970-05-19 Smiths Industries Ltd Electrical oscillation generators
US3812670A (en) * 1971-09-25 1974-05-28 Citizen Watch Co Ltd Converter drive circuit in an electronic timepiece

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4144467A (en) * 1973-11-30 1979-03-13 Citizen Watch Co., Ltd. Pulse motor
US3992868A (en) * 1974-03-05 1976-11-23 Citizen Watch Co., Ltd. Timepiece with calendar mechanism
US3984972A (en) * 1974-04-04 1976-10-12 Kabushiki Kaisha Suwa Seikosha Transducer for quartz crystal timepiece
US4085577A (en) * 1975-07-02 1978-04-25 Citizen Watch Co. Ltd. Electronic timepiece
US4114364A (en) * 1976-01-29 1978-09-19 Kabushiki Kaisha Daini Seikosha Driving pulse width controlling circuit for a transducer of an electronic timepiece
US4157647A (en) * 1976-07-21 1979-06-12 Kabushiki Kaisha Daini Seikosha Hand reversing system for an electronic timepiece
DE2759956C1 (de) * 1976-10-06 1990-08-02 Kabushiki Kaisha Suwa Seikosha, Tokio/Tokyo Elektronische Uhr mit einem Schrittmotor
US4212156A (en) * 1976-10-06 1980-07-15 Kabushiki Kaisha Suwa Seikosha Step motor control mechanism for electronic timepiece
US4370065A (en) * 1976-10-06 1983-01-25 Kabushiki Kaisha Suwa Seikosha Step motor control mechanism for electronic timepiece
US4599005A (en) * 1976-10-06 1986-07-08 Seiko Epson Corporation Step motor control mechanism for electronic timepiece
US4715725A (en) * 1976-10-06 1987-12-29 Seiko Epson Corporation Step motor control mechanism for electronic timepiece
DE2745052A1 (de) * 1976-10-06 1978-04-20 Suwa Seikosha Kk Elektronische uhr
US5038329A (en) * 1976-10-06 1991-08-06 Seiko Epson Corporation Step motor control mechanism for electronic timepiece
US4382691A (en) * 1977-03-16 1983-05-10 Kabushiki Kaisha Daini Seikosha Electronic watch
FR2388325A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Dispositif de reduction de la consommation d'une montre electronique
FR2388324A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Montre electronique analogique a faible consommation
FR2388326A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Dispositif de detection des conditions de rotation du moteur d'une montre electronique
US4271496A (en) * 1977-04-23 1981-06-02 Kabushiki Kaisha Daini Seikosha Electronic watch
FR2388328A1 (en, 2012) * 1977-04-23 1978-11-17 Seiko Instr & Electronics
FR2388330A1 (fr) * 1977-04-23 1978-11-17 Seiko Instr & Electronics Montre electronique
US4368990A (en) * 1977-04-23 1983-01-18 Kabushiki Kaisha Daini Seikosha Electronic timepiece
US4312059A (en) * 1977-04-23 1982-01-19 Kabushiki Kaisha Daini Seikosha Electronic timepiece
US4361410A (en) * 1977-09-26 1982-11-30 Citizen Watch Company Ltd. Drive system for pulse motor
DE2841946A1 (de) * 1977-12-02 1979-06-07 Seiko Instr & Electronics Elektronische uhr
US4326278A (en) * 1977-12-02 1982-04-20 Kabushiki Kaisha Daini Seikosha Electronic timepiece
US4445784A (en) * 1977-12-02 1984-05-01 Kabushiki Kaisha Daini Seikosha Electronic timepiece
FR2435076A1 (fr) * 1978-06-20 1980-03-28 Ebauches Sa Procede pour reduire la consommation d'une piece d'horlogerie electronique et piece d'horlogerie electronique mettant en oeuvre ce procede
US4281405A (en) * 1978-06-20 1981-07-28 Ebauches S.A. Reduction of energy consumption of electronic timepiece
US4221111A (en) * 1978-08-15 1980-09-09 Citizen Watch Company Limited Electronic timepiece having a voltage conversion circuit
US4315329A (en) * 1978-09-12 1982-02-09 Kabushiki Kaisha Daini Seikosha Load measuring device for the gear train of a timepiece
US4348752A (en) * 1979-06-28 1982-09-07 Eta A.G. Ebauches-Fabrik Electronic watch with movable detecting member
EP0021494A1 (fr) * 1979-06-28 1981-01-07 Eta A.G. Ebauches-Fabrik Montre électronique à affichage à aiguilles et à détecteur de rotation
EP0027856A1 (de) * 1979-09-19 1981-05-06 Braun Aktiengesellschaft Schaltungsanordnung zur Regelung von Drehzahl und Phasenlage bei Synchronmotoren
US4492905A (en) * 1979-10-31 1985-01-08 Pfister Jean Francois Intermittent drive arrangement
FR2478400A1 (fr) * 1980-01-30 1981-09-18 Portescap Dispositif de commande d'un moteur electrique
WO1981002207A1 (en) * 1980-01-30 1981-08-06 Portescap Electric motor control device
US4430007A (en) 1980-08-25 1984-02-07 Eta S.A. Fabriques D'ebauches Method of reducing the power consumption of the stepping motor of an electronic timepiece and an electronic timepiece employing the method
DE3132304A1 (de) * 1980-08-25 1982-05-27 ETA S.A. Fabriques d'Ebauches, 2540 Granges "verfahren zum verringern des energieverbrauchs des schrittschaltmotors in einem elektronischen uhrwerk und elektronisches uhrwerk, bei dem das verfahren angewandt wird"
EP0057663A3 (en) * 1981-02-04 1982-08-18 N.V. Philips' Gloeilampenfabrieken Control device for stepping motor
EP0874292A3 (en) * 1997-04-25 1999-03-03 Seiko Instruments Inc. Electronic timepiece
US6088302A (en) * 1997-04-25 2000-07-11 Seiko Instruments Inc. Electronic timepiece
US6584040B1 (en) 1997-04-25 2003-06-24 Seiko Instruments Inc. Electronic timepiece
US6262554B1 (en) * 1998-09-22 2001-07-17 Seiko Epson Corporation Electronic device and method of controlling the same
US20150123590A1 (en) * 2012-06-20 2015-05-07 Trinamic Motion Control Gmbh & Co. Kg Method and circuit assembly for driving a stepper motor
US9621086B2 (en) * 2012-06-20 2017-04-11 Trinamic Motion Control Gmbh & Co. Kg Method and circuit assembly for driving a stepper motor
CN110083044A (zh) * 2018-01-26 2019-08-02 精工电子有限公司 机芯和钟表
CN110083044B (zh) * 2018-01-26 2021-10-29 精工电子有限公司 机芯和钟表

Also Published As

Publication number Publication date
MY7800077A (en) 1978-12-31
GB1425840A (en) 1976-02-18
HK4678A (en) 1978-01-27
JPS4985514A (en, 2012) 1974-08-16
JPS5542356B2 (en, 2012) 1980-10-30

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