US3795098A - Time correction device for digital indication electronic watch - Google Patents

Time correction device for digital indication electronic watch Download PDF

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Publication number
US3795098A
US3795098A US00204064A US3795098DA US3795098A US 3795098 A US3795098 A US 3795098A US 00204064 A US00204064 A US 00204064A US 3795098D A US3795098D A US 3795098DA US 3795098 A US3795098 A US 3795098A
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United States
Prior art keywords
divider circuit
frequency divider
minute
steps
frequency
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Expired - Lifetime
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US00204064A
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English (en)
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K Fujita
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Individual
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Individual
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/08—Visual time or date indication means by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques
    • G04G9/12—Visual time or date indication means by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques using light valves, e.g. liquid crystals
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F10/00—Apparatus for measuring unknown time intervals by electric means
    • G04F10/04—Apparatus for measuring unknown time intervals by electric means by counting pulses or half-cycles of an AC
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G5/00—Setting, i.e. correcting or changing, the time-indication
    • G04G5/04—Setting, i.e. correcting or changing, the time-indication by setting each of the displayed values, e.g. date, hour, independently

Definitions

  • ABSTRACT A digital indication electronic wristwatch having a liquid crystal display panel driven by the output of a standard oscillator through frequency divider circuitry. Time regulation is provided by means of a first switch for resetting the entire frequency dividing circuit and a second switch for individually resetting that portion of the frequency divider circuit whose output corresponds to a l-second or l-minute signal. 1f desired, further swiches may be provided for individually resetting those portions of the frequency divider circuit whose output corresponds respectively to the 10- second, 10-minute or l-hour signal. I
  • a digital indication electronic wristwatch having standard high frequency oscillator means, frequency divider circuit means coupled to saidoscillator means for dividing the frequency output thereof into time indication signals, liquid crystal display means, means for applying said time indication signals to said liquid crystal display means for the digital display of time, and time regulation means including first switch means for resetting said'frequency divider circuit means as a unit, and second switch means coupled to the portion of said frequency divider circuits producing a l-second or l-minute signal for resetting said individual portion. Further switch means may be provided for individually correcting each of the portions of said frequency divider circuit means producing the second, lO-minute and l-hour signals.
  • FIG. 1 is a block diagram of the digital indication electronic timepiece incorporating a time correction device according to the invention
  • FIG. 2 is a circuit diagram of a COS/MOS inverter according to the invention.
  • FIG. 3 is a COS/MOS ripple carry counter according to the invention.
  • FIG. 1 a block diagram of one embodiment of a digital indication electronic watch provided with a time correction and regulation device is depicted;
  • X refers to a time standard crystal oscillator, the frequency of which is generally selected at 2 so as to permit efficient frequency division.
  • the output signal of said crystal oscillator is amplified and reversed in phase by an inverter and applied to a ripple carry counter 1 formed from metal oxide semi-conductor transistors arranged in complimentary-symmetry configurations, and hereinafter referred to as COS/MOS transistors.
  • FIG. 2 A circuit diagram of an inverter formed of COS/MOS transistors and the input and output wave forms thereof is depicted in FIG. 2.
  • Said inverter circuit is formed of a pair of MOS transistors aligned in the complimentarysymmetry configuration.
  • ripple carry counter 1 begins counting when the voltage on the reset terminal R is low and is reset when the voltage on reset terminal R is high.
  • the input signals, taken from the crystal oscillator and inverters are applied to terminals 4) and zb while the outputs at each step are taken at terminals Q and
  • ripple carry counter 1 has n steps and produces a l-second signal at output terminal O which is applied to the nextfrequency dividing step.
  • Circuit network 2 includes a decade counter and a segment decoder, and is adapted to produce a 10- second signal from the l-second signal, while at the same time, producing the l-second timing signals which are applied to a segment decoder 8 to operate the seconds units digit of the liquid crystal display panel 7.
  • Said seconds units digit, as well as the other digits of the liquid crystal display panel each consist of a 7 bar display, said segment decoder serving to excite the appropriate segments for display of the required number ramzqrql 9-..Saids9sms 2ts12s9sls p s in the same manner as the decoder drivers de ibed in United States Pat. No. 3,672,155, which issued to John M. Bergey et al. on June 27, 1972, and may be formed of like circuitry.
  • Circuit networks 3 and 5 each consist of a U6 fre- Circuit networks I, 2, 3, 4, 5 and 6 are connected in,
  • Regulation of the circuit of FIG. 1 is effected, in the first instance, by a switch S which, when closed, resets all of the circuit networks 1, 2, 3, 4, 5 and 6.
  • the resetting voltage is applied through the diode and inverters.
  • the opening and closing of switch S permits the use of the watch as a stopwatch.
  • the switch S would permit the setting of the watch only once a day at 24 oclock, an arrangement which is completely inconvenient.
  • each unit of indication may be individually corrected by meansof the switches S S S and 8,.
  • Such correction can be effected rapidly and precisely both when the electric power source is first applied, and during normal use, when the time indication of the watch is incorrect.
  • a digital indication electronic wristwatch comprising standard high frequency oscillator means; multi-stepped frequency divider cirucit means coupled to said oscillator means for dividing the frequency output thereof'into time indication signals, including l-second, 10-second, l-minute, 10-minute,
  • liquid crystal display means adapted for the digital display of time; means for applying said time indication signals to said liquid crystal display means for driving said display means; and time regulation means including resetting switch ifiiQoh' Sid to said frequency divider circuit;
  • a zero condition as a unit a unit
  • a plurality of singleswitch means each including a single ma'nually'operable switch, oneof said :single switch means being coupled to each of the steps of said frequency divider circuit means producing said l-second, lO-second, l-minute, IO-minute, and l-hour signals for individually correcting each of said steps Without affecting the higher frequency. steps by increasing the count in each of said dividercircuit steps by one unit upon each manual operation of the respective single switches.
  • a digital indication electronic wristwatch as recited in claim 1, wherein said steps of said frequency divider circuit means are connected in series, and including capacitor means connected to the output of the step in advance of each step to be individually. reset, each of said single switches being connected between a high potential and a point in said series 7 connection intermediate said capacitor means and each step to be corrected; and resistor means connected between a low potential and each 'of said 3.
  • a digital indication electronic wristwatch prising standard high frequency oscillator means; multi-stepped frequency divider circuit means coupled to said oscillator means for dividing the frequency output thereof into time indication signals, including l-minute, l0-minute, and lhour signals;' liquid crystal display means adapted for the digitaldisplay of time; means for applying said time indication signals 'to'said liquidcrystal display means. for .driving said displayimeans; and time regulation .means including resetting switch means coupledto creasing the count in each of said divider circuits steps by one unit upon each manual operation of the respective single switches, said steps of said frequency divider circuit means being connected in.
  • each said single switch being connected between a high potential and a point in said series connection intermediate said capacitor means and each step to be corrected; and resistor means con- ,nected between a low potential and each of said points in said series connection.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electric Clocks (AREA)
US00204064A 1970-12-03 1971-12-02 Time correction device for digital indication electronic watch Expired - Lifetime US3795098A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45106454A JPS5134311B1 (en)) 1970-12-03 1970-12-03

Publications (1)

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US3795098A true US3795098A (en) 1974-03-05

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ID=14434029

Family Applications (1)

Application Number Title Priority Date Filing Date
US00204064A Expired - Lifetime US3795098A (en) 1970-12-03 1971-12-02 Time correction device for digital indication electronic watch

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US (1) US3795098A (en))
JP (1) JPS5134311B1 (en))
CH (2) CH568610B5 (en))
DE (1) DE2158522C3 (en))
GB (1) GB1361216A (en))
HK (1) HK41576A (en))

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942318A (en) * 1970-12-03 1976-03-09 Kabushiki Kaisha Suwa Seikosha Time correction device for digital indication electronic watch
US3955352A (en) * 1973-02-01 1976-05-11 Berney Jean Claude Electronic watch with digital display having a correction mechanism for small errors
US3967442A (en) * 1973-02-01 1976-07-06 Berney Jean Claude Electric watch having an electromechanical movement including a correction mechanism for small errors
US3994124A (en) * 1974-05-01 1976-11-30 Kabushiki Kaisha Suwa Seikosha Electronic timepiece
US4033108A (en) * 1976-03-02 1977-07-05 Bulova Watch Company, Inc. Automatic cut-off setting system for LED display in a solid-state watch
US4052842A (en) * 1975-01-31 1977-10-11 Ebauches S.A. Circuit for electronic watches
US4074513A (en) * 1975-05-07 1978-02-21 Girard-Perregaux S.A. Electronic display device
US4377740A (en) * 1979-06-25 1983-03-22 Toyota Jidosha Kogyo Kabushiki Kaisha Initializing circuit arrangement for a counter circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485033A (en) * 1968-03-19 1969-12-23 Corning Glass Works Electronic timepiece having light beam adjustment means
US3596462A (en) * 1969-01-31 1971-08-03 Royce Hayes Electronic clock
US3664118A (en) * 1970-09-09 1972-05-23 Hamilton Watch Co Electronically controlled timepiece using low power mos transistor circuitry
US3668859A (en) * 1969-07-03 1972-06-13 Vogel Paul Time setting device for an electronic clock
US3672155A (en) * 1970-05-06 1972-06-27 Hamilton Watch Co Solid state watch

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3166742A (en) * 1963-03-22 1965-01-19 American Sign & Indicator Co Control for lamp bank displays
US3194003A (en) * 1963-11-13 1965-07-13 Vogel And Company P Solid state electronic timepiece
US3363410A (en) * 1966-01-25 1968-01-16 Suwa Seikosha Kk Apparatus for adjusting electric timepieces
US3505804A (en) * 1968-04-23 1970-04-14 Rca Corp Solid state clock
US3576099A (en) * 1969-04-22 1971-04-27 Hamilton Watch Co Solid state timepiece having electro-optical time display

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485033A (en) * 1968-03-19 1969-12-23 Corning Glass Works Electronic timepiece having light beam adjustment means
US3596462A (en) * 1969-01-31 1971-08-03 Royce Hayes Electronic clock
US3668859A (en) * 1969-07-03 1972-06-13 Vogel Paul Time setting device for an electronic clock
US3672155A (en) * 1970-05-06 1972-06-27 Hamilton Watch Co Solid state watch
US3664118A (en) * 1970-09-09 1972-05-23 Hamilton Watch Co Electronically controlled timepiece using low power mos transistor circuitry

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942318A (en) * 1970-12-03 1976-03-09 Kabushiki Kaisha Suwa Seikosha Time correction device for digital indication electronic watch
US3955352A (en) * 1973-02-01 1976-05-11 Berney Jean Claude Electronic watch with digital display having a correction mechanism for small errors
US3967442A (en) * 1973-02-01 1976-07-06 Berney Jean Claude Electric watch having an electromechanical movement including a correction mechanism for small errors
US3994124A (en) * 1974-05-01 1976-11-30 Kabushiki Kaisha Suwa Seikosha Electronic timepiece
US4052842A (en) * 1975-01-31 1977-10-11 Ebauches S.A. Circuit for electronic watches
US4074513A (en) * 1975-05-07 1978-02-21 Girard-Perregaux S.A. Electronic display device
US4033108A (en) * 1976-03-02 1977-07-05 Bulova Watch Company, Inc. Automatic cut-off setting system for LED display in a solid-state watch
US4377740A (en) * 1979-06-25 1983-03-22 Toyota Jidosha Kogyo Kabushiki Kaisha Initializing circuit arrangement for a counter circuit

Also Published As

Publication number Publication date
DE2158522A1 (de) 1972-06-08
CH568610B5 (en)) 1975-10-31
CH1768971A4 (en)) 1975-05-30
DE2158522C3 (de) 1985-04-18
DE2158522B2 (de) 1977-08-25
GB1361216A (en) 1974-07-24
HK41576A (en) 1976-07-09
JPS5134311B1 (en)) 1976-09-25

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