GB1262764A - Improvements in and relating to battery-powered clocks - Google Patents

Improvements in and relating to battery-powered clocks

Info

Publication number
GB1262764A
GB1262764A GB07047/69A GB1704769A GB1262764A GB 1262764 A GB1262764 A GB 1262764A GB 07047/69 A GB07047/69 A GB 07047/69A GB 1704769 A GB1704769 A GB 1704769A GB 1262764 A GB1262764 A GB 1262764A
Authority
GB
United Kingdom
Prior art keywords
fork
circuit
coil
oscillator
current
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
Application number
GB07047/69A
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.)
General Time Corp
Original Assignee
General Time Corp
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 General Time Corp filed Critical General Time Corp
Publication of GB1262764A publication Critical patent/GB1262764A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G04C3/16—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating an electro-dynamic continuously rotating motor
    • G04C3/165—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating an electro-dynamic continuously rotating motor comprising a mechanical regulating device influencing the electromotor
    • 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
    • G04C3/08—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 mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/10—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 mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromechanical Clocks (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

1,262,764. Transistor oscillator circuits. GENERAL TIME CORP. 1 April, 1969 [5 April, 1968], No. 17047/69. Heading H3T. [Also in Divisions G3 and H2] In a battery powered clock a synchronous motor is energized via a bi-stable switching circuit 102 (Fig. 9) driven by an oscillator circuit 101 the output frequency of which is controlled by a tuning fork. The oscillations of the fork are maintained by current pulses through a drive coil 105 when a transistor Q 1 is rendered fully conducting by a pulse derived from voltage induced in a pick-up coil 104 due to oscillation of the fork. The pick-up and drive coils are coaxially wound on a permanent magnet core (Fig. 8, not shown) and disposed between the tines of the fork. The oscillator circuit is self starting by virtue of a slight positive bias due to current through coil 105, R112 and the base/ emitter of Q 1 , and appearing at the base when the circuit is initially energized. The fork tines are thereby caused to deflect and induce a voltage in coil 104 which renders Q 1 more conductive and eventually Q 1 is driven into saturation. Capacitors 110 and 111 serve to shift the electrical resonant frequency of the circuit into the vicinity of the natural resonant frequency of the fork. C110 also reduces the possibility of spurious H.F. oscillations triggering Q 1 . The oscillator output is coupled via a capacitor 120 to a conventional bi-stable switching circuit 102. Each time a negative pulse is received via diodes 117, 118 the bi-stable circuit changes state and passes current to motor coils 113, 114 alternately.
GB07047/69A 1968-04-05 1969-04-01 Improvements in and relating to battery-powered clocks Expired GB1262764A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71908768A 1968-04-05 1968-04-05

Publications (1)

Publication Number Publication Date
GB1262764A true GB1262764A (en) 1972-02-09

Family

ID=24888703

Family Applications (1)

Application Number Title Priority Date Filing Date
GB07047/69A Expired GB1262764A (en) 1968-04-05 1969-04-01 Improvements in and relating to battery-powered clocks

Country Status (4)

Country Link
US (1) US3541778A (en)
CA (1) CA928832A (en)
DE (1) DE1916604A1 (en)
GB (1) GB1262764A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29403E (en) * 1970-07-27 1977-09-20 Kabushiki Kaisha Suwa Seikosha Quartz crystal wrist watch
US3902312A (en) * 1970-07-27 1975-09-02 Suwa Seikosha Kk Quartz crystal wrist watch
US3737746A (en) * 1972-04-19 1973-06-05 Gen Time Corp Quartz crystal controlled stepper motor
US3775963A (en) * 1973-01-12 1973-12-04 T Clapham Magnetic clock
US3824781A (en) * 1973-03-14 1974-07-23 Timex Corp Horological movement employing inductive stepping motor
FR2268293B3 (en) * 1974-04-18 1977-02-18 Valroger Pierre
US3978651A (en) * 1974-12-27 1976-09-07 Kabushiki Kaisha Suwa Seikosha Step motor for quartz crystal electronic timepiece
WO2012032993A1 (en) * 2010-09-09 2012-03-15 シチズンホールディングス株式会社 Oscillating stepping motor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1560056A (en) * 1923-05-01 1925-11-03 Western Electric Co Source of waves of constant frequency
US3250066A (en) * 1963-08-12 1966-05-10 Philco Corp Electronic clock utilizing oscillator to switch bistable circuit at subharmonic of oscillator frequency
US3421309A (en) * 1966-06-13 1969-01-14 Bulova Watch Co Inc Unitized tuning fork vibrator

Also Published As

Publication number Publication date
US3541778A (en) 1970-11-24
CA928832A (en) 1973-06-19
DE1916604A1 (en) 1969-10-30

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