IT957908B - QUARTZ CRYSTAL SYNCHRONIZED CLOCK - Google Patents

QUARTZ CRYSTAL SYNCHRONIZED CLOCK

Info

Publication number
IT957908B
IT957908B IT50298/72A IT5029872A IT957908B IT 957908 B IT957908 B IT 957908B IT 50298/72 A IT50298/72 A IT 50298/72A IT 5029872 A IT5029872 A IT 5029872A IT 957908 B IT957908 B IT 957908B
Authority
IT
Italy
Prior art keywords
oscillator
balance wheel
pulses
watch
quartz crystal
Prior art date
Application number
IT50298/72A
Other languages
Italian (it)
Original Assignee
Timex 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 Timex Corp filed Critical Timex Corp
Application granted granted Critical
Publication of IT957908B publication Critical patent/IT957908B/en

Links

Classifications

    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)

Abstract

A highly accurate watch, comprising a quartz crystal time base and a movement controlled by an oscillator regulated to run slightly fast and being periodically connected to the quartz crystal time base. In one embodiment, a pulse counter totals the number of pulses put out by the watch oscillator during its normal operation and activates means to stop the oscillator when a sufficient number of pulses equal to a fixed time period has been reached. A second counter totals the pulses from the quartz cyrstal time reference and reactivates the watch when the number pulses equals the fixed time period thereby wiping out accumulated time errors. In a second embodiment, the output from a balance wheel oscillator and a divided down time base frequency are fed to a flip - flop. The output square wave increases in width due to the frequency difference between the balance wheel and time base and is integrated by an RC circuit. A Schmitt trigger circuit and monostable multivibrator are coupled to the flip - flop so that the trigger circuit is activated for a fixed short time interval and stops the balance wheel through a solenoid. After elapse of the fixed time interval, the balance wheel starts again.
IT50298/72A 1971-05-18 1972-05-17 QUARTZ CRYSTAL SYNCHRONIZED CLOCK IT957908B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14460171A 1971-05-18 1971-05-18

Publications (1)

Publication Number Publication Date
IT957908B true IT957908B (en) 1973-10-20

Family

ID=22509309

Family Applications (1)

Application Number Title Priority Date Filing Date
IT50298/72A IT957908B (en) 1971-05-18 1972-05-17 QUARTZ CRYSTAL SYNCHRONIZED CLOCK

Country Status (11)

Country Link
US (1) US3756014A (en)
JP (1) JPS5226472B1 (en)
AU (1) AU456330B2 (en)
BE (1) BE783649A (en)
CA (1) CA970862A (en)
CH (1) CH551038A (en)
DE (1) DE2222936A1 (en)
FR (1) FR2138117B1 (en)
GB (1) GB1344769A (en)
IT (1) IT957908B (en)
NL (1) NL7206659A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1450071A (en) * 1972-10-02 1976-09-22 Citizen Watch Co Lgd Electronic timepiece
FR2202318B1 (en) * 1972-10-11 1976-10-29 Hatot Leon Ets
US3967442A (en) * 1973-02-01 1976-07-06 Berney Jean Claude Electric watch having an electromechanical movement including a correction mechanism for small errors
CA1056166A (en) * 1975-03-27 1979-06-12 Jauch, Heinz Method and aparatus for synchronising a mechanical oscillating system to the accuracy of a quartz standard
JPS525566A (en) * 1975-07-02 1977-01-17 Citizen Watch Co Ltd Electric clock
US4068462A (en) * 1976-05-17 1978-01-17 Fairchild Camera And Instrument Corporation Frequency adjustment circuit
US4401977A (en) * 1980-01-07 1983-08-30 Mastiff Security Systems Limited Radio transmitter for repeated bursts of oscillations
FR2521741A1 (en) * 1982-02-17 1983-08-19 Gorgy Timing Clock seconds indicator stepping motor synchronisation - by using quartz oscillator and opto-electronic zero position detection
CH665082GA3 (en) * 1986-03-26 1988-04-29
US4799003A (en) * 1987-05-28 1989-01-17 Tu Xuan M Mechanical-to-electrical energy converter
EP3130966B1 (en) * 2015-08-11 2018-08-01 ETA SA Manufacture Horlogère Suisse Mechanical clockwork provided with a motion feedback system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS42801Y1 (en) * 1964-04-21 1967-01-18
CH490710A (en) * 1966-02-10 1969-08-15 Suisse Horlogerie Electronic timepiece
US3451210A (en) * 1966-07-01 1969-06-24 Benrus Corp System for maintaining oscillations in an electric timing mechanism having an oscillatory element
GB1205753A (en) * 1966-09-09 1970-09-16 Smiths Industries Ltd Horological instruments incorporating electrical oscillation generators
US3564829A (en) * 1967-10-19 1971-02-23 Kiyohiro Tsuzuki Apparatus and method for spinning yarn
JPH069145Y2 (en) * 1988-07-19 1994-03-09 鐘淵化学工業株式会社 Insulation wall structure of building

Also Published As

Publication number Publication date
US3756014A (en) 1973-09-04
CA970862A (en) 1975-07-08
FR2138117A1 (en) 1972-12-29
AU456330B2 (en) 1974-12-12
GB1344769A (en) 1974-01-23
DE2222936A1 (en) 1972-11-30
NL7206659A (en) 1972-11-21
AU4222772A (en) 1973-11-15
FR2138117B1 (en) 1974-12-27
BE783649A (en) 1972-09-18
CH723872A4 (en) 1973-12-28
CH551038A (en) 1974-06-28
JPS5226472B1 (en) 1977-07-14

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