US3653204A - Digital display world clock - Google Patents

Digital display world clock Download PDF

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Publication number
US3653204A
US3653204A US60015A US3653204DA US3653204A US 3653204 A US3653204 A US 3653204A US 60015 A US60015 A US 60015A US 3653204D A US3653204D A US 3653204DA US 3653204 A US3653204 A US 3653204A
Authority
US
United States
Prior art keywords
time
city
counter
counter means
world clock
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
US60015A
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English (en)
Inventor
Akihiro Miwa
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Application granted granted Critical
Publication of US3653204A publication Critical patent/US3653204A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G04G9/087—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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0076—Visual time or date indication means in which the time in another time-zone or in another city can be displayed at will
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/02—Visual time or date indication means by selecting desired characters out of a number of characters or by selecting indicating elements the position of which represent the time, e.g. by using multiplexing techniques
    • G04G9/027—Visual time or date indication means by selecting desired characters out of a number of characters or by selecting indicating elements the position of which represent the time, e.g. by using multiplexing techniques provided with means for displaying at will a time indication or a date or a part thereof

Definitions

  • Adder means of an electronic computer and a [52] U.S.Cl ..58/42.5, 58/4 quartz crystal clock are combined in this world clock and 8 [5l] IIILCI ..G04b 19/22, G04b 19/24 counter means is driven i Synchronization with the time of [58] Field of Search "SS/ kg,8 Greenwich standard time minus 12 houm 6 Claims, 6 Drawing Figures 6 3 CITLJING M STARTER SW/TCH $Z, L 5] 2 H; 9 I #z 6 (06K PULSE I00 I PULSE All/M85? (0l/A/7Ek 40052 SUMMH?
  • the present invention relates to a digital display world clock, more particularly to a digital display world clock which displays day, hour, minute and second corresponding to each city of the world by selecting a push-button.
  • the object of the present invention is to provide a digital world clock which displays local time of each city of the world by pushing the push-'ubtton corresponding to that city.
  • Another object of the present invention is to provide a small size, lightweight and portable world clock, which is suitable to be set in the guest rooms of a hotel, the office rooms of a trading firm, etc., and to be employed on modern aircraft, ships and the like.
  • a further object of the present invention is to provide a world clock which is enabled to display summer (daylight) time, in the event that summer (daylight) time is effective in the city selected.
  • a still further object of the present invention is to provide a world clock comprising a day number change switch. By setting said switch to the day number of the previous month, this clock automatically shows the first day of the next month after having shown the last day of the preceding month.
  • users by adding 1 hour to the time indicated by the clock, may be enabled to know the exact time.
  • clocks of this type are so large in size and heavy in weight which makes it difficult to transport or carry and once set down become difficult to move.
  • the present invention is characterized by the fact that a quartz crystal clock and adder means of an electronic computer are combined in one set and a clock pulse generator which is controlled by a quartz crystal oscillator, counter means which are driven in synchronization to the time of Greenwich standard time minus 12 hours, adder means which add signals from the city selecting switch and signals from said counter means, and display means which display time and day of the present city or time and day of another selected city are incorporated therein.
  • 1 shows a clock pulse generator which is constituted of a quartz crystal oscillator circuit and a divider circuit and which generates stabilized 1 Hz., 100 Hz. and 1,000 Hz. pulses.
  • 2 shows counter means which contains the counters for the second digit (4 bit, decimal), the counter for the seconds digit (3 bit, hexanary), the counter for the hour digits (5 bit, 24 abic system) and the counter for the day digits (the unit digit; 4 bit, decimal; the 10th digit; 2 bit, quaternary).
  • the output signals of each digit of said counter means are binary code signals, the number of which corresponds to the number of the bit indicated in the parenthesis.
  • Said counter means is usually driven in synchronization to the time of the Greenwich standard time minus 12 hours.
  • 3 shows a day number change switch which generates a reset signal according to any one of the scales of 28-31 by previously setting it to the day number of the month (any of 28, 29, 30 and 31) manually.
  • 4 shows a pulse number change switch which changes the number of the pulses transmitted from the clock pulse generator 1 to the counter means 2. Usually it is set at the start position and connected as 1 Hz. pulses are transmitted from the clock pulse generator to the counter means 2.
  • the counter means 2 indicates day and time at random when it is connected to the power source.
  • the counter means 2 is quickly fed by changing the pulse number changing switch 4 to 1,000 Hz., Hz. or 1 Hz. as occasion demands.
  • the counter means 2 indicates 25th day, 14 hours, 59 minutes and 30 seconds, and we want to correct it to 24th day, 23 hours, 42 minutes and 00 seconds.
  • the day number change switch 3 is so constructed to work according to 31 abic system, when the pulse number change switch 4 is transferred from start position to any one of the 1,000 Hz., 100 Hz. or I Hz. position, it is necessary to quickly feed the counter means 2, 30 days, 8 hours, 42 minutes and 30 seconds.
  • the pulse number change switch 4 when the pulse number change switch 4 is transferred from the start position to any of the 1,000 Hz., 100 Hz. and 1 Hz. positions, the 1 second digit counter and 10 seconds digit counter of counter means 2 are reset to zero. Accordingly, the counter means 2 indicates 25th day, 14 hours, 59 minutes and 00 second. As a result, it is necessary to quickly feed the counter means 2, 30 days, 8 hours, 43 minutes and 00 second.
  • the device is so constructed that the signals of 1,000 Hz., 100 Hz. and 1 Hz. are added to the 1 minute digit counter. In the event the counter means 2 is fed corresponding to 30 days, 8 hours, 43 minutes, 00 second using only 1 Hz. signals, it consumes much time, namely 43,723 seconds. By adding 1,000 Hz., 100 Hz. and 1 Hz. signals properly to the 1 minute digit counter of the counter means 2, much time is saved for setting the counter means 2.
  • the pulse number change switch 4 is transferred to the START position and starter switch 5 is pushed. 1 Hz. pulses are transmitted from the clock pulse generator 1 to the scale of 1 second of the counter means 2.
  • adder means which adds day and time counted by the counter means 2 (time of Greenwich standard time minus 12 hours) and time corresponding to the difference in time between the place and a certain city in parallel. Its operation is based on the same principle as adder circuits of the electronic computer.
  • the signals on the 1 second, 10 seconds and 1 minute digit counters of the counter means 2 have no connection with the addition of time corresponding to time difference between cities, they are connected directly to the display means 7. Further, the signals on the 10 minutes digit counter, hour digits counter and day digits counter, after being added, time correspond to time difference between cities on the adder means 6, also connected to the display means 7 and displayed digitally.
  • This display means 7 uses numeric display tubes, display tubes with semi-conductor or the like.
  • the display means 7 can also be placed at as many places as desired at the same time.
  • FIG. 8 shows a city selecting switch to allow the counter means 2 to indicate time at the major cities of the world, and is provided with several 10s of push-buttons 8a 8b 8n corresponding to the number of cities required.
  • the 10 minutes digit counter consists of a ternary counter 20 and a binary counter 2b (ternary multiplied by binary) as shown in FIG. 2.
  • I 0 l (40 minutes) l 0 O (30 minutes) l 00l (l0 minutes) I is a carry signal to the hour. The result of addition is displayed on the 10 minutes of the display means 7.
  • Addition at the hour digits counter is done on the adder means 6b (5 bit) which is connected to the 24 abic system counter 2c.
  • Addition at the day digits counter is done using a binary coded decimal counter 2d for the unit digit, and a binary coded quaternary counter 2e for the lOth digit which constitute 283l abic system counter together with the day number change circuit 3.
  • the adder means 6c (4 bit) is connected to the decimal counter 2d and the adder means 6d (2 bit) is connected to the quaternary counter 2e.
  • the correction of difference in time between cities is effected in the adder means 6 by parallel addition of time corresponding to difference in time between the present place and the city to the day and time counted by the counter 2 which works continuously, and therefore no error occurs in correcting the difference in time caused by contact of the city selecting switch 8.
  • a world clock comprising a clock pulse generator, counter means working in synchronization with the time of Greenwich standard time minus 12 hours in response to signals from said generator, a city selecting switch providing a signal, means adding the signals from said counter means and those from said city selecting switch to provide an output signal representing the time in the selected city and display means for displaying the time in the selected city.
  • a world clock comprising a clock pulse generator controlled by an oscillator, counter means working in synchronization with the time of Greenwich standard time minus 12 hours in response to signals from said generator, a city selecting switch providing a signal, means adding the signals from said counter means and those from said city selecting switch to provide an output signal representing the time in the selected city and display means showing digitally date and time in the selected city.
  • a world clock according to claim 2 comprising a summer (daylight) time switch adding a summer (daylight) time signal.
  • a day number change switch for generating a reset signal according to any of the scales of 28 to 31 by initially setting it to the day number of the month.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
US60015A 1969-08-20 1970-07-31 Digital display world clock Expired - Lifetime US3653204A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44065555A JPS4842189B1 (en, 2012) 1969-08-20 1969-08-20

Publications (1)

Publication Number Publication Date
US3653204A true US3653204A (en) 1972-04-04

Family

ID=13290349

Family Applications (1)

Application Number Title Priority Date Filing Date
US60015A Expired - Lifetime US3653204A (en) 1969-08-20 1970-07-31 Digital display world clock

Country Status (6)

Country Link
US (1) US3653204A (en, 2012)
JP (1) JPS4842189B1 (en, 2012)
CH (2) CH537608A (en, 2012)
DE (1) DE2041028C3 (en, 2012)
FR (1) FR2058393B1 (en, 2012)
GB (1) GB1275693A (en, 2012)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738099A (en) * 1972-06-07 1973-06-12 Seiko Instr & Electronics Digital electronic watch having calendar display arrangement
US3765162A (en) * 1971-02-05 1973-10-16 Suma Seikosha K K Watch indicating many times
US3777471A (en) * 1971-08-27 1973-12-11 Bulova Watch Co Inc Presettable frequency divider for electronic timepiece
US3803834A (en) * 1973-02-06 1974-04-16 Time Computer Wristwatch calculator
US3813533A (en) * 1972-06-02 1974-05-28 Garrett Comtronics Corp Clock calculator
US3816730A (en) * 1971-10-04 1974-06-11 Omron Tateisi Electronics Co Electronic calculator with an incorporated digital clock
US3852950A (en) * 1971-12-07 1974-12-10 Seiko Instr & Electronics Electronic timepiece
US3922842A (en) * 1971-10-28 1975-12-02 Suwa Seikosha Kk Display means for solid state electronic timepiece
US3940920A (en) * 1973-03-19 1976-03-02 Matsushita Electric Industrial Co., Ltd. Zone time display clock
USRE29250E (en) * 1971-06-06 1977-06-07 Kabushiki Kaisha Suwa Seikosha Digital electronic watch having calendar display arrangement
US4044545A (en) * 1974-12-11 1977-08-30 Matsushita Electric Industrial Co., Ltd. World clock
US4072005A (en) * 1975-06-27 1978-02-07 Stanley Electric Co., Ltd. Clock device
US4133170A (en) * 1975-04-30 1979-01-09 Casio Computer Co., Ltd. Global timepiece
US4180969A (en) * 1976-09-03 1980-01-01 Kabushiki Kaisha Suwa Seikosha Electronic timepiece with global time zone display
US4194196A (en) * 1977-10-25 1980-03-18 Mohiuddin Mohammed S Illuminated master calendar and message recording system
DE2952376A1 (de) * 1978-12-25 1980-07-03 Casio Computer Co Ltd Datumsanzeigevorrichtung
US4253169A (en) * 1978-02-07 1981-02-24 Salah Ibrahim M Electronic calculation watch with digital display
US4280207A (en) * 1976-02-12 1981-07-21 Kabushiki Kaisha Suwa Seikosha Electronic timepiece and digital display therefor
US4313186A (en) * 1977-03-25 1982-01-26 Sharp Kabushiki Kaisha Electronic timepiece with time zone change features
US4319350A (en) * 1979-06-01 1982-03-09 Ebauches Electroniques S.A. Electronic watch
GB2211964A (en) * 1987-12-21 1989-07-12 Seikosha Kk World timepiece
US5237544A (en) * 1989-07-07 1993-08-17 Citizen Watch Co., Ltd. Analog world watch
US5499220A (en) * 1993-11-05 1996-03-12 Seiko Instruments Inc. Electronic timepiece
US5881023A (en) * 1997-10-07 1999-03-09 Gu; Jing-Lu Self-correcting clock
US5901115A (en) * 1996-04-18 1999-05-04 Helmut Hechinger Gmbh & Co. Analog radio clock with time zone conversion
US5907523A (en) * 1995-10-26 1999-05-25 Richins; Jay Multi-time-zone timepiece display

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS538232B1 (en, 2012) * 1971-03-24 1978-03-27
JPS5245980A (en) * 1975-10-09 1977-04-12 Seiko Instr & Electronics Ltd Digital electronic watch
JPS5249063A (en) * 1975-10-16 1977-04-19 Seiko Instr & Electronics Ltd Digital electronic watch
JPS5251974A (en) * 1975-10-24 1977-04-26 Seiko Instr & Electronics Ltd Digital alarm electronic watch
JPS6116267U (ja) * 1984-06-29 1986-01-30 新東工業株式会社 石油タンク等の壁面研掃用シヨツトブラスト装置における昇降移動装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186158A (en) * 1963-06-13 1965-06-01 Mendell E Miller Zone time display clock

Family Cites Families (1)

* 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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186158A (en) * 1963-06-13 1965-06-01 Mendell E Miller Zone time display clock

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765162A (en) * 1971-02-05 1973-10-16 Suma Seikosha K K Watch indicating many times
USRE29250E (en) * 1971-06-06 1977-06-07 Kabushiki Kaisha Suwa Seikosha Digital electronic watch having calendar display arrangement
US3777471A (en) * 1971-08-27 1973-12-11 Bulova Watch Co Inc Presettable frequency divider for electronic timepiece
US3816730A (en) * 1971-10-04 1974-06-11 Omron Tateisi Electronics Co Electronic calculator with an incorporated digital clock
US3922842A (en) * 1971-10-28 1975-12-02 Suwa Seikosha Kk Display means for solid state electronic timepiece
US3852950A (en) * 1971-12-07 1974-12-10 Seiko Instr & Electronics Electronic timepiece
US3813533A (en) * 1972-06-02 1974-05-28 Garrett Comtronics Corp Clock calculator
US3738099A (en) * 1972-06-07 1973-06-12 Seiko Instr & Electronics Digital electronic watch having calendar display arrangement
US3803834A (en) * 1973-02-06 1974-04-16 Time Computer Wristwatch calculator
US3940920A (en) * 1973-03-19 1976-03-02 Matsushita Electric Industrial Co., Ltd. Zone time display clock
US4044545A (en) * 1974-12-11 1977-08-30 Matsushita Electric Industrial Co., Ltd. World clock
US4133170A (en) * 1975-04-30 1979-01-09 Casio Computer Co., Ltd. Global timepiece
US4072005A (en) * 1975-06-27 1978-02-07 Stanley Electric Co., Ltd. Clock device
US4280207A (en) * 1976-02-12 1981-07-21 Kabushiki Kaisha Suwa Seikosha Electronic timepiece and digital display therefor
US4180969A (en) * 1976-09-03 1980-01-01 Kabushiki Kaisha Suwa Seikosha Electronic timepiece with global time zone display
US4316272A (en) * 1976-09-03 1982-02-16 Kabushiki Kaisha Suwa Seikosha Electronic timepiece with global time zone display
US4313186A (en) * 1977-03-25 1982-01-26 Sharp Kabushiki Kaisha Electronic timepiece with time zone change features
US4194196A (en) * 1977-10-25 1980-03-18 Mohiuddin Mohammed S Illuminated master calendar and message recording system
US4253169A (en) * 1978-02-07 1981-02-24 Salah Ibrahim M Electronic calculation watch with digital display
DE2952376A1 (de) * 1978-12-25 1980-07-03 Casio Computer Co Ltd Datumsanzeigevorrichtung
US4319350A (en) * 1979-06-01 1982-03-09 Ebauches Electroniques S.A. Electronic watch
GB2211964A (en) * 1987-12-21 1989-07-12 Seikosha Kk World timepiece
GB2211964B (en) * 1987-12-21 1992-07-08 Seikosha Kk World timepiece
US5237544A (en) * 1989-07-07 1993-08-17 Citizen Watch Co., Ltd. Analog world watch
US5499220A (en) * 1993-11-05 1996-03-12 Seiko Instruments Inc. Electronic timepiece
US5907523A (en) * 1995-10-26 1999-05-25 Richins; Jay Multi-time-zone timepiece display
US5901115A (en) * 1996-04-18 1999-05-04 Helmut Hechinger Gmbh & Co. Analog radio clock with time zone conversion
US5881023A (en) * 1997-10-07 1999-03-09 Gu; Jing-Lu Self-correcting clock

Also Published As

Publication number Publication date
DE2041028A1 (de) 1971-03-04
FR2058393B1 (en, 2012) 1973-12-21
CH537608A (fr) 1972-10-31
DE2041028B2 (de) 1973-08-30
DE2041028C3 (de) 1974-03-28
FR2058393A1 (en, 2012) 1971-05-28
GB1275693A (en) 1972-05-24
CH1246670A4 (en, 2012) 1972-10-31
JPS4842189B1 (en, 2012) 1973-12-11

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