US3756010A - Magnetic-induction clock - Google Patents

Magnetic-induction clock Download PDF

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Publication number
US3756010A
US3756010A US00169734A US3756010DA US3756010A US 3756010 A US3756010 A US 3756010A US 00169734 A US00169734 A US 00169734A US 3756010D A US3756010D A US 3756010DA US 3756010 A US3756010 A US 3756010A
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US
United States
Prior art keywords
circuit
transistor
induction
voltage
output
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.)
Expired - Lifetime
Application number
US00169734A
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English (en)
Inventor
A Kotani
R Kimura
M Kajihara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Application granted granted Critical
Publication of US3756010A publication Critical patent/US3756010A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C11/00—Synchronisation of independently-driven clocks
    • G04C11/08—Synchronisation of independently-driven clocks using an electro-magnet or-motor for oscillation correction
    • G04C11/081—Synchronisation of independently-driven clocks using an electro-magnet or-motor for oscillation correction using an electro-magnet
    • G04C11/084—Synchronisation of independently-driven clocks using an electro-magnet or-motor for oscillation correction using an electro-magnet acting on the balance
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C11/00—Synchronisation of independently-driven clocks
    • G04C11/02—Synchronisation of independently-driven clocks by radio
    • 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
    • G04C3/04—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance
    • G04C3/06—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance
    • G04C3/065—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a balance using electromagnetic coupling between electric power source and balance the balance controlling gear-train by means of static switches, e.g. transistor circuits
    • G04C3/067—Driving circuits with distinct detecting and driving coils
    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R40/00—Correcting the clock frequency
    • G04R40/02—Correcting the clock frequency by phase locking

Definitions

  • PAIENTEflm 4 an SHEEI 5 0f 8 INVENTORS Rom/M6000 K/MukA NASANOR/ KAJIHARA Ak/H/DE k0 m/v/ ATTO'RNEYS PAIENTEBscr 4 ma 3,756,010
  • induction type clock in which a highly accurate standard oscillator is separately disposed and, in the event of the external magnetic disturbance, the detected signal voltage is automatically interrupted by an electrical circuit, and the clock is driven synchronously with the frequency provided from said standard oscillator, whereby the accuracy of the clock is maintained so as to be free of any external magnetic disturbance.
  • FIG. 1 is a block diagram showing a magnetic induction type clock embodying this invention
  • FIG. 1 there is shown in a block diagram an example of the clock according to the present invention.
  • This clock comprises a signal detector A for detecting signals from an external induction magnetic field, a transistor motor B, a standard oscillation source C, and a switching circuit D. Further, as shown in FIG.
  • FIG. 3 shows a more detailed circuit of FIG. 3.
  • the output signal voltage from the nonlinear amplitude limiter is applied to the base of the above RC oscillator via said coupling capacitor C
  • the oscillation frequency of the RC oscillator is synchronized with the input signal voltage so as to operate as an external signal synchronous oscillator.
  • the amplified waveform becomes such as A in FIG. 7 (II), where the waveforms are linked together or intermittent at certain intermediate points. If this waveform signal is converted into a trigger voltage, the waveform becomes FIG. 7 (II) b, where the trigger disappears partly. If this trigger voltage is used, the output of the monostable multivibrator becomes FIG. 7 (II) C, where the waveform is partly lacking.
  • the DC voltage obtained from such partly lacking waveform output of the monostable multivibrator as above when converted by the integrator circuit becomes lowered as indicated by FIG. 7 (II) D. When this DC voltage comes down below a certain threshold voltage, the state of the Schmitt circuit is inverted.
  • the transistor T turns OFF, and transistor T turns ON.
  • the collector potential of the transistor T is decreased nearly to zero potential from the collector supply voltage. This zero potential is applied to the base of the switchingtransistor T to turn this transistor OFF.
  • the synchronous current which is a divided quarter of the detected commercial frequency is interrupted.
  • the collector of the Schmitt circuit receives its sup ply voltage from a constant voltage source through line 8. Therefore, the collector output control voltage is zero when the transistor T is ON, or it is about 1.5V when the transistor T is OFF. This voltage is too low to control the switching transistors T and T which are to control the synchronous current supplied from the balance wheel circuit.
  • a circuit comprising transistors T and T is used, whereby a control voltage of 0 to 3V is obtained from the collector of the transistor T and thus the switching transistors T and T are controlled.
  • diodes D14 and D15 The purpose of diodes D14 and D15 is to make the square wave output voltage of the monostable multivibrator stable against variations in the power source voltage. At the same time, these diodes serve to slightly lower the square wave output voltage when the ambient temperature is raised. As a result, due to lowering of the rise voltage of the diode, the DC voltage of the integrator circuit is lowered. This serves to compensate for any variation in the threshold voltage due to decrease of the base-emitter voltage V of the transistor T25.
  • FIG. 8 (I) shows another embodiment of the invention, wherein a filter F for absorbing the disturbed signal caused by rotation of the rotor and vibration of the balance wheel is inserted between the induction magnetic field detector and the voltage amplifier circuit.
  • a filter F for absorbing the disturbed signal caused by rotation of the rotor and vibration of the balance wheel is inserted between the induction magnetic field detector and the voltage amplifier circuit.
  • the voltage of the desired frequency can be voltage-amplified to drive the transistor motor.
  • the response characteristic thereof is as shown in FIG.
  • circuitry block diagram can be simplified.
  • a battery-driven cordless induction clock in accordance with claim 1, in which said actuating means includes means for converting the output signal from said amplifier into direct current and means for detecting variations in said direct current to indicate whether said magnetic field is normal or abnormal.
  • a battery-driven cordless induction clock in accordance with claim 6, in which the axial direction of said induction coil, the axial direction of the balance wheel of said standard oscillation source, and the axial direction of the rotor of said transistor motor unit are disposed in parallel with each other on the same plane.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Electric Clocks (AREA)
  • Measuring Magnetic Variables (AREA)
  • Burglar Alarm Systems (AREA)
US00169734A 1970-08-11 1971-08-06 Magnetic-induction clock Expired - Lifetime US3756010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7066870 1970-08-11

Publications (1)

Publication Number Publication Date
US3756010A true US3756010A (en) 1973-09-04

Family

ID=13438262

Family Applications (1)

Application Number Title Priority Date Filing Date
US00169734A Expired - Lifetime US3756010A (en) 1970-08-11 1971-08-06 Magnetic-induction clock

Country Status (4)

Country Link
US (1) US3756010A (enrdf_load_stackoverflow)
CH (2) CH1173271A4 (enrdf_load_stackoverflow)
DE (1) DE2139682C3 (enrdf_load_stackoverflow)
FR (1) FR2102184B1 (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881310A (en) * 1971-03-02 1975-05-06 Diehl Clock adapted to be synchronized by alternating current in a wireless manner
US3902311A (en) * 1972-12-15 1975-09-02 Johnson Service Co Remote time clock system with standby power means
US3908353A (en) * 1973-10-09 1975-09-30 Engler Instr Company Electric timepiece drive
US3922588A (en) * 1973-02-26 1975-11-25 Centra Buerkle Kg Albert Drive arrangement for switching clocks
US4023344A (en) * 1975-09-03 1977-05-17 Kabushiki Kaisha Suwa Seikosha Automatically corrected electronic timepiece
US4040247A (en) * 1975-12-02 1977-08-09 Tri-Tech, Inc. Clock drive apparatus
US4321520A (en) * 1978-07-19 1982-03-23 Kabushiki Kaisha Daini Seikosha Electronic timepiece
US4321519A (en) * 1978-05-26 1982-03-23 Kabushiki Kaisha Daini Seikosha Magnetic field detection device for electronic timepiece
US4321521A (en) * 1978-12-25 1982-03-23 Kabushiki Kaisha Daini Seikosha Detection device of electronic timepiece
US20040001390A1 (en) * 2002-05-29 2004-01-01 Saburo Manaka Electronic timepiece

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3832406A1 (fr) * 2019-12-06 2021-06-09 Tissot S.A. Procédé de gestion de l'utilisation de données dans une montre
JP2024138836A (ja) * 2023-03-27 2024-10-09 セイコーエプソン株式会社 機械式時計

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786972A (en) * 1956-04-27 1957-03-26 Gen Electric Commercial power frequency cordless synchronous clock
US3163978A (en) * 1962-01-29 1965-01-05 Kohlhagen Walter Cordless clock of commercial powerferquency synchronized type
US3507111A (en) * 1966-06-07 1970-04-21 Matsushita Electric Ind Co Ltd Electric clock
US3566600A (en) * 1968-06-21 1971-03-02 Matsushita Electric Ind Co Ltd Electric time-piece

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2786972A (en) * 1956-04-27 1957-03-26 Gen Electric Commercial power frequency cordless synchronous clock
US3163978A (en) * 1962-01-29 1965-01-05 Kohlhagen Walter Cordless clock of commercial powerferquency synchronized type
US3507111A (en) * 1966-06-07 1970-04-21 Matsushita Electric Ind Co Ltd Electric clock
US3566600A (en) * 1968-06-21 1971-03-02 Matsushita Electric Ind Co Ltd Electric time-piece

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3881310A (en) * 1971-03-02 1975-05-06 Diehl Clock adapted to be synchronized by alternating current in a wireless manner
US3902311A (en) * 1972-12-15 1975-09-02 Johnson Service Co Remote time clock system with standby power means
US3922588A (en) * 1973-02-26 1975-11-25 Centra Buerkle Kg Albert Drive arrangement for switching clocks
US3908353A (en) * 1973-10-09 1975-09-30 Engler Instr Company Electric timepiece drive
US4023344A (en) * 1975-09-03 1977-05-17 Kabushiki Kaisha Suwa Seikosha Automatically corrected electronic timepiece
US4040247A (en) * 1975-12-02 1977-08-09 Tri-Tech, Inc. Clock drive apparatus
US4321519A (en) * 1978-05-26 1982-03-23 Kabushiki Kaisha Daini Seikosha Magnetic field detection device for electronic timepiece
US4321520A (en) * 1978-07-19 1982-03-23 Kabushiki Kaisha Daini Seikosha Electronic timepiece
US4321521A (en) * 1978-12-25 1982-03-23 Kabushiki Kaisha Daini Seikosha Detection device of electronic timepiece
US20040001390A1 (en) * 2002-05-29 2004-01-01 Saburo Manaka Electronic timepiece

Also Published As

Publication number Publication date
DE2139682A1 (de) 1972-04-06
CH1173271A4 (enrdf_load_stackoverflow) 1972-07-31
FR2102184B1 (enrdf_load_stackoverflow) 1975-02-21
DE2139682B2 (de) 1973-08-09
FR2102184A1 (enrdf_load_stackoverflow) 1972-04-07
DE2139682C3 (de) 1974-03-07
CH533331A (de) 1972-07-31

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