US3852950A - Electronic timepiece - Google Patents

Electronic timepiece Download PDF

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Publication number
US3852950A
US3852950A US00311945A US31194572A US3852950A US 3852950 A US3852950 A US 3852950A US 00311945 A US00311945 A US 00311945A US 31194572 A US31194572 A US 31194572A US 3852950 A US3852950 A US 3852950A
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United States
Prior art keywords
time
shift register
display
electronic timepiece
date
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
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US00311945A
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English (en)
Inventor
K Yoda
K Tanaka
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Seiko Instruments Inc
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Seiko Instruments Inc
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    • 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
    • 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
    • G04G9/087—Visual time or date indication means by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques provided with means for displaying at will a time indication or a date or a part thereof

Definitions

  • An electronic timepiece comprises means for selec- [52] US. Cl 58/4 A, 58/58, 58/85.5 i l displaying the time including at
  • This invention relates generally to electronic timepieces and more particularly to an easy-to-handle electronic timepiece of a small size wherein time adjustments are made with ease.
  • An object of the present invention is to provide an electronic timepiece correctly adjustable by extremely simple operations whenever one wants to adjust advances or delays of the timepiece.
  • An electronic timepiece comprises means for generating a time signal of a unit time serving as a time base. Means are provided for displaying time indications including at least one of the date, day of the week, hour, minute and seconds time indications in digital formby counting the time signal with counting means. Control means control the display means to selectively display one of the times of date, day of the week, hour, minute and second.
  • the control means comprises a shift register having at least one output signal of a predetermined level upon reception of which said display means are operated to display at least one of said time indications and switching means for shifting said output signal ofa predetermined level to change the display of time.
  • FIG. I is a block diagram of an embodiment of an electronic timepiece according to the present invention.
  • FIGS. 2 and 3 are, respectively, block diagram and logic tables of gate circuits employed in an electronic timepiece according to the present invention.
  • FIG. 1 there is shown an embodiment of an electronic timepiece according to the present invention wherein a seconds pulse generator 11 comprising a quartz oscillator OSC and a frequency divider DIV produces a seconds pulse.
  • the divider divides the frequency of the crystal so the output is a frequency of one pulse per second which is applied through a NOR circuit 6, to a seconds counter GOS, a minute counter GOM, an hour counter 24, and a day of the week counter 7 connected cascaded through gate circuits G, to G respectively.
  • the output of the week counter 7 is applied to a date counter 31 through a gate circuit 6,.
  • the seconds, minute, hour, day of the week, and date time signals respectively produced by the second counter GOS, minute counter GOM, hour counter 24, day of the week counter 7 and date counter 31 are transmitted to a second decoder DB minute decoder DE,, hour decoder DE, day of the week decoder DE,, and date decoder DE, of a decoder 13 for DATE, Day of The WEEK, HOUR, MINUTE, and SECOND displays on a display panel 14 under control of OR circuits OR, to OR., respectively.
  • the gate circuits G to G comprise NOR circuits 21 to 24 and an inverter IN including four input terminals A to D and an output terminal E as. shown in FIG. 2.
  • the signals appearing at the output terminal E are determined according to a logic truth table wherein X" means that either signal 1 to 0" applies and C and D mean that the output signals on the terminal E coincide with the input signals on the terminals C and D, respectively.
  • the gate circuit G comprises NOR circuits 21 to 23, and an inverter IN including three input terminals A, C, and D, and the output terminal E as shown in FIG. 3.
  • the signals appearing at the output terminal E are determined by the logic truth table as shown in FIG. 3.
  • the OR gate circuits OR, to OR, receive the signals from a shift register 12, having six bits in this embodiment, which shifts the signal I initially stored on the first bit to the next adjacent bits in succession for every reception of the clock pulse from a NOR circuit NOR,
  • a switching section 15 comprising a set switch'S,, a shift switch 8,, a reset switch S and a safety switch 8,.
  • the switches S, to S can only be operated when they are pressed jointly with the safety switch S, for preventing erroneous operations.
  • the simultaneous operation of the set switch S, and the safety switch 5. causes the NOR circuit NOR, to be operated through a NOR circuit NOR, and an inverter W, for rapid correction of the minute, hour, day of the week and date displays.
  • the operation of the shift switch S together with the safety switch 8. applies a clock pulse to the shift register 12 for selective display of the seconds to the date.
  • the shift register 12 is reset through a NOR circuit NOR, and NAND gate circuits NAND, and NAND
  • the shift register 12 initially has stored therein a control signal, 100000, as shown in FIG. 1, corresponding to the normal mode of operation of the electronic timepiece, or when there is no need to change the display of the date, day of the week, hour, minute and second.
  • the signal stored in the first-digit of the shift register 12 is applied to the control terminals of the decoders DE,, DB DE,,, DE, and DE,, via OR gate OR,, OR gate OR,, OR gate OR, and OR gate 0R respectively.
  • the outputs of the decoders DE,, DE,, DE,,, DE, and DE, are applied to the corresponding date display DATE, day of the week display Day Of The WEEK, hour display HOUR, minute display MINUTE and seconds display SEC.
  • the seconds pulse is generated from the frequency divider which divides the high oscillatory frequency of the quartz oscillator into the low frequency.
  • the seconds pulse from the divider is applied to the input of a 60-abic second counter GOS via the NOR gate NOR 6 so as to apply the seconds signals to the input of the decoder DE, for seconds display.
  • the carry pulse from the 60-abic second counter GOS is applied from the input terminal C of the GATE circuit G,, via I the output terminal E, to the 60-abic minute counter GOS for generating the minute signals so as to apply the minute signals from the 60-abic minute counter to the input of the decoder DE, for display of minutes.
  • the carry pulse from the 60-abic minute counter GOM for generating the minute signals is applied to the 24-abic hour counter 24 from the input terminal of the GATE circuit G via the output terminal E.
  • the 24- abic hour counter 24 in turn applies the hour signals to the decoder DE, for hour displays.
  • the output of the 24-abic hour counter 24 is connected to the input terminal C in the GATE circuit 6;, to connect 24- abic hour counter 24 to the 7-abic week counter 7 for generating the day of the week signals.
  • the 7-abic day of the week counter 7 applies week signals to the decoder DE, for day of the week displays.
  • the carry pulse from the 24-abic hour counter 24 for generating the hour signals is applied from the input terminal C of the gate circuit G, to the 3l-abic date counter 31 for generating the date signal 8 via the output terminal E thereof, while date signals from the 31- abic date counter 31 are applied to the decoder DE, for date display. Since the input of the terminal A of the gate circuit G, is zero due to no outputs of the fifth and sixth digit of the shift register, the output of the terminal E is the same as that of the terminal C under normal operating conditions. Moreover, the gate input B is zero since the fourth digit output of the shift register 12, is zero. Consequently, the output of the terminal E of gate circuit G is equal to the input of the terminal C, if input of the terminal A is zero (See the Logic Tables in FIG. 2 and FIG. 3).
  • display section 14 displays signals from the counters 31, 7, 24, 60M and 60S.
  • the shift switch S When only the date display is to be changed, the shift switch S is operated simultaneously with the safety switch 8,. The operation of the shift switch S and safety switch S, causes the signal conditions to be changed from I to to change the output of the NOR gate NOR 3 to 1 thus applying a shifting clock pulse to the shift register 12.
  • the signal 0 is always applied to the first digit input of the shift register 12, so that the application of the clock pulse changes the state of the register 12 into 010000.
  • the output of the second digit in the shift register 12 is changed from 0 to I with the result that the date signals from the date counter 31 are applied to the decoder DE, through the OR gate OR, to operate the DATE display.
  • the shift switch 5 When the content of the DATE display is to be changed, the shift switch 5;, together with the safety switch S, are turned on to operate only the date display. It is to be noted that other day of the week, hour, minute and second displays are not operated, they are extinguished.
  • the setting switch S together with the safety switch S, are actuated to apply the input 0 to the NOR gate NOR 7 through the NOR 2 and the inverter W, for correction of the date display.
  • the seconds pulse from the seconds pulse generator 11 is applied to the input terminals D of the Gate circuits G, to G.,, respectively, during operation of the shift switch S
  • Only the gate circuit G connecting the 7-abic week counter 7 to the 31-abic date counter 31 has the signal on its input terminal'A changed from 0 to I," so that the signal on the output terminal E conforms to that on the input terminal D (see the logic table in FIG. 2) to which the seconds pulses are applied from the seconds pulse generator 11.
  • the date display undergoes rapid adjustment because the signal on the terminal E is applied to the date counter 31.
  • the shift switch S together with safety switch S, are turned on once again.
  • the clock pulse is applied to the shift register 12 from the NOR gate NOR- and the content of the shift register 12 changes to 001000.
  • the output of the second digit of the shift register changes from l to 0.
  • the output of the date display decoder DE is blocked and the date display is operated.
  • the day of the week display Day Of The WEEK is operated because the output of the third digit of the shift register 12 changes from 0 to I (note that the hour display, minute display and second display remain extinguished).
  • the procedures are as follows: When the shift switch S and safety switch S, are turned on together, the hour display HOUR only is operated, just as in the case where the weekdisplay is changed. If the set switch S, and safety switch S, are turned on simultaneously in the next step, NOR gate NOR, opens and the second pulse is applied to the terminals D in the GATE circuits G, to G At this time, the signal 1" on the fourth digit output of the shift register is applied to the terminal A of the GATe circuit G which connects the 60-abic minute counter GOM to the 24-abic hour counter 24.
  • the seconds pulse is applied from the seconds pulse generator 11 via GATE circuitG to the hour counter 24 to change the hour display by controlling the set switch 5,.
  • the minute display is rapidly set in the following way:
  • the NOR gate NOR opens and clocks the shift register 12. More specifically, its content turns into 000010 and the fifth digit output of the shift register serves to control the decoders DE, and DE, via OR gate 0R thereby causing the decoder DE, and DE, to display minute and seconds signals and at the same time keeping date, day of the week and hour displays extinguished. If the set switch 5, and safety switch S, are turned on at this instant, the seconds pulse will be applied from the seconds pulse generator 11 via terminal E in the GATE circuit G, which connects the 60-abic minute counter GOM to the 60-abic seconds counter GOS, to change the minute display to the required minute.
  • the content of the shift register temporarily turns into 000001 by function of the shift pulse, but the sixth digit output immediately resets respectively the second, third, fourth, fifth, and sixth digit of the shift register 12 via the inverter IN and NAND gate NAND so as to produce the signal l in the 1st digit of shift register 12.
  • the content of the shift register is restored to the initial state.
  • the date display DATE, day of the week display, DAY OF THE WEEK, hour display HOUR, minute display MINUTE and seconds display SECOND can be selected simply by turning on the shift switch 8,.
  • the content of the display thus selected can be changed to the required display by turning on the set switch S, and safety switch 8,.
  • the reset switch S If the reset switch S is turned on simultaneously with the safety switch the output signal of NOR gate NOR, changes from 0 to l and this output is applied to one input of the NAND gate NAND,. At the I same time, the output of the NOR gate NOR, is delayed by only a short time by inverter IN, and applied to another input of NAND gate NAND,, so that a the signal level of0 at the output of the NAND circuit NAND, is applied to the NAND circuit NAND in form of a pulse.
  • the pulse l having a narrow width is produced from the output of the NAND circuit NAND and applied to the reset terminal of the shift register 12 to change the registered content of the second to sixth digits in the register to 0, simultaneously setting the 1st digit to l for restoration of the shift register to its initial state.
  • the reset signal is applied to an input of AND gate, and AND gate,. Furthermore, the sixth digit output of the shift register 12 is applied to one terminal of the AND gate, via OR gate CR and OR, while the first digit output of the shift register 12 is applied to one terminal of AND gate AND, to reset the divider DIV, -abic second counter G05 and the 60-abic minute counter GOM.
  • the second-setting is usually performed by listening to a time broadcast.
  • the minute and second displays can be reset at 00 minute and 00 second by the reset switch S as shown in the embodiment in FIG. 1 only if it is turned on simultaneously with thesafety switch 8,.
  • the watch is stopped because the second signal is not applied to input of the second counter 608 as input. If the reset switch S is pushed simultaneously with the safety switch S at this time, the shift register 12 is set at its initial state and the second counter 608 is reset, as explained above.
  • the shift switch S set switch S, and reset switch 8, do not work, if they are turned on independently of safety switch 3,. Each must be turned on together with the safety switch S.,. This is an extremely important feature to prevent erroneous operation.
  • the GATE circuits G, to G employed in this invention can be realized by such a circuit as shown in FIG. 2.
  • the GATE circuit G can be accomplished by such a circuit as shown in FIG. 3.
  • this invention makes it possible to adjust the date, day of the week, hour, minute and second displayed on an electronic wrist watch by an extremely small number of switches.
  • electronic watches of extremely small size can be manufactured.
  • a watch according to the present invention is very easy to use because the time setting adjustments are displayed to the user while they are being made thus preventing erroneous time settings.
  • circuitry according to the present invention completely eliminates inadvertent operation by providing the electronic wrist watch with the safety switch. Further, time can be set to a time broadcast or some other time standard by the reset switch to the exact second.
  • the present invention is not limited only to timepieces capable of displaying date, day of the week, hour, minute, and second, but can be applied to timepieces capable of displaying any one of any combination of them.
  • An electronic timepiece comprising, means generating time signal pulses constituting a time base, counting means receptive of said time signal pulses for counting said time signal pulses, means connected to the counting means developing digital outputs representative of time corresponding to at least one of date, day of the week, hour, minute and seconds time indications, display means connected to the means developing digital outputs to diaplay at least one of said time indications, and control means connected to said counting means and said display means for selectively displaying individually said time indications on said dising to the position of said control signal in said shift register.
  • An electronic timepiece including means comprising a safety switch operable in conjunction with said switching means, resetting means and said setting means individually to insure correct ad- 10 justment of said time indications and to prevent inadvertent changes thereto.
  • control means comprises means for displaying simultaneously all said time indications on said

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US00311945A 1971-12-07 1972-12-04 Electronic timepiece Expired - Lifetime US3852950A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP46098296A JPS5219788B2 (de) 1971-12-07 1971-12-07

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US00311945A Expired - Lifetime US3852950A (en) 1971-12-07 1972-12-04 Electronic timepiece

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US (1) US3852950A (de)
JP (1) JPS5219788B2 (de)
CH (2) CH1783272A4 (de)
DE (1) DE2259957C3 (de)
FR (1) FR2162539B1 (de)
GB (1) GB1366795A (de)
IT (1) IT973778B (de)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953963A (en) * 1973-08-09 1976-05-04 Kabushiki Kaisha Suwa Seikosha Electronic digital display timepiece correction device
US3988886A (en) * 1973-08-14 1976-11-02 Casio Computer Co., Ltd. Time setting device for an electronic watch
US4028878A (en) * 1974-12-11 1977-06-14 Ebauches S.A. Control device for an electronic wrist watch
US4030283A (en) * 1974-03-25 1977-06-21 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Electrically driven time piece with means for effecting a precise setting of time
US4043114A (en) * 1974-11-21 1977-08-23 Tokyo Shibaura Electric Co., Ltd. Circuits for setting the display mode and the correction mode of electronic timepieces
US4067187A (en) * 1972-12-28 1978-01-10 Citizen Watch Co., Ltd. Electronic timepiece
US4072005A (en) * 1975-06-27 1978-02-07 Stanley Electric Co., Ltd. Clock device
US4085575A (en) * 1975-09-22 1978-04-25 Kabushiki Kaisha Daini Seikosha Digital electronic timepiece
DE2658080A1 (de) * 1976-12-22 1978-07-06 Kloeckner Humboldt Deutz Ag Impulsregenerator
US4102122A (en) * 1975-11-04 1978-07-25 Kabushiki Kaisha Daini Seikosha Electronic watch
USRE29720E (en) * 1972-04-17 1978-08-08 Kabushiki Kaisha Suwa Seikosha Time correcting apparatus for an electronic timepiece
US4107915A (en) * 1972-12-28 1978-08-22 Citizen Watch Co., Ltd Electronic timepiece
US4148180A (en) * 1976-05-11 1979-04-10 Kabushiki Kaisha Suwa Seikosha Electronic timepiece circuit for automatically displaying the day of the week
US4176516A (en) * 1975-06-13 1979-12-04 Nippon Electric Co., Ltd. Arrangement for putting an electronic timepiece right with minute indication advanced at first
US4182111A (en) * 1976-12-13 1980-01-08 Citizen Watch Co., Ltd. Electronic timepiece
US4207731A (en) * 1976-11-18 1980-06-17 Kabushiki Kaisha Suwa Seikosha Electronic timepiece control circuit
US4216649A (en) * 1976-07-06 1980-08-12 Citizen Watch Company Limited Function selection circuit for multi-function timepiece
US4270194A (en) * 1974-10-31 1981-05-26 Citizen Watch Company Limited Electronic alarm timepiece
US4300221A (en) * 1978-07-06 1981-11-10 Kabushiki Kaisha Seikosha Electronic timepiece
US4308608A (en) * 1979-07-31 1981-12-29 Toyota Jidosha Kogyo Kabushiki Kaisha Digital electronic timepieces
CN114815572A (zh) * 2022-04-29 2022-07-29 杭州晶华微电子股份有限公司 一种可以自动计算星期值的实时时钟单元电路

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4934869A (de) * 1972-07-31 1974-03-30
JPS5062474A (de) * 1973-10-03 1975-05-28
JPS5097464U (de) * 1974-01-05 1975-08-14
JPS532792B2 (de) * 1974-10-15 1978-01-31
JPS5146170A (de) * 1974-10-18 1976-04-20 Hitachi Ltd
JPS533272B2 (de) * 1975-03-06 1978-02-04
JPS6015906B2 (ja) * 1975-06-13 1985-04-22 日本電気株式会社 電子時計
JPS5276968A (en) * 1975-12-23 1977-06-28 Sanyo Electric Co Ltd Second correcting device for electronic watches
JPS5289356A (en) * 1976-01-20 1977-07-26 Sanyo Electric Co Ltd Method of resetting indication correcting mode of electronic timepiece
JPS52102771A (en) * 1976-02-24 1977-08-29 Sanyo Electric Co Ltd Method of resetting indication correcting mode of electronic timepiece
JPS52141671A (en) * 1976-05-20 1977-11-26 Sharp Corp Digital display electronic watch with stop watch
JPS5339168A (en) * 1976-09-21 1978-04-10 Citizen Watch Co Ltd Digital electronic watch
JPS56159708A (en) * 1980-05-12 1981-12-09 Toyota Motor Corp Data inputting method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333410A (en) * 1965-04-02 1967-08-01 Instr For Industry Inc Electronic clock-calendar
US3646751A (en) * 1969-12-05 1972-03-07 Detection Sciences Digital timing system
US3653204A (en) * 1969-08-20 1972-04-04 Seiko Instr & Electronics Digital display world clock
US3672155A (en) * 1970-05-06 1972-06-27 Hamilton Watch Co Solid state watch
US3707071A (en) * 1971-03-12 1972-12-26 Hamilton Watch Co Solid state timepiece

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333410A (en) * 1965-04-02 1967-08-01 Instr For Industry Inc Electronic clock-calendar
US3653204A (en) * 1969-08-20 1972-04-04 Seiko Instr & Electronics Digital display world clock
US3646751A (en) * 1969-12-05 1972-03-07 Detection Sciences Digital timing system
US3672155A (en) * 1970-05-06 1972-06-27 Hamilton Watch Co Solid state watch
US3707071A (en) * 1971-03-12 1972-12-26 Hamilton Watch Co Solid state timepiece

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29720E (en) * 1972-04-17 1978-08-08 Kabushiki Kaisha Suwa Seikosha Time correcting apparatus for an electronic timepiece
US4067187A (en) * 1972-12-28 1978-01-10 Citizen Watch Co., Ltd. Electronic timepiece
US4107915A (en) * 1972-12-28 1978-08-22 Citizen Watch Co., Ltd Electronic timepiece
US3953963A (en) * 1973-08-09 1976-05-04 Kabushiki Kaisha Suwa Seikosha Electronic digital display timepiece correction device
US3988886A (en) * 1973-08-14 1976-11-02 Casio Computer Co., Ltd. Time setting device for an electronic watch
US4030283A (en) * 1974-03-25 1977-06-21 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Electrically driven time piece with means for effecting a precise setting of time
US4270194A (en) * 1974-10-31 1981-05-26 Citizen Watch Company Limited Electronic alarm timepiece
US4043114A (en) * 1974-11-21 1977-08-23 Tokyo Shibaura Electric Co., Ltd. Circuits for setting the display mode and the correction mode of electronic timepieces
US4028878A (en) * 1974-12-11 1977-06-14 Ebauches S.A. Control device for an electronic wrist watch
US4176516A (en) * 1975-06-13 1979-12-04 Nippon Electric Co., Ltd. Arrangement for putting an electronic timepiece right with minute indication advanced at first
US4072005A (en) * 1975-06-27 1978-02-07 Stanley Electric Co., Ltd. Clock device
US4085575A (en) * 1975-09-22 1978-04-25 Kabushiki Kaisha Daini Seikosha Digital electronic timepiece
US4102122A (en) * 1975-11-04 1978-07-25 Kabushiki Kaisha Daini Seikosha Electronic watch
US4148180A (en) * 1976-05-11 1979-04-10 Kabushiki Kaisha Suwa Seikosha Electronic timepiece circuit for automatically displaying the day of the week
US4216649A (en) * 1976-07-06 1980-08-12 Citizen Watch Company Limited Function selection circuit for multi-function timepiece
US4207731A (en) * 1976-11-18 1980-06-17 Kabushiki Kaisha Suwa Seikosha Electronic timepiece control circuit
US4182111A (en) * 1976-12-13 1980-01-08 Citizen Watch Co., Ltd. Electronic timepiece
DE2658080A1 (de) * 1976-12-22 1978-07-06 Kloeckner Humboldt Deutz Ag Impulsregenerator
US4300221A (en) * 1978-07-06 1981-11-10 Kabushiki Kaisha Seikosha Electronic timepiece
US4308608A (en) * 1979-07-31 1981-12-29 Toyota Jidosha Kogyo Kabushiki Kaisha Digital electronic timepieces
CN114815572A (zh) * 2022-04-29 2022-07-29 杭州晶华微电子股份有限公司 一种可以自动计算星期值的实时时钟单元电路

Also Published As

Publication number Publication date
DE2259957A1 (de) 1973-06-14
JPS4863765A (de) 1973-09-04
IT973778B (it) 1974-06-10
FR2162539B1 (de) 1976-10-29
JPS5219788B2 (de) 1977-05-30
DE2259957C3 (de) 1980-09-25
DE2259957B2 (de) 1979-10-25
GB1366795A (en) 1974-09-11
FR2162539A1 (de) 1973-07-20
CH588113B5 (de) 1977-05-31
CH1783272A4 (de) 1976-08-31

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