EP0418012A2 - Weltuhr - Google Patents

Weltuhr Download PDF

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Publication number
EP0418012A2
EP0418012A2 EP90309871A EP90309871A EP0418012A2 EP 0418012 A2 EP0418012 A2 EP 0418012A2 EP 90309871 A EP90309871 A EP 90309871A EP 90309871 A EP90309871 A EP 90309871A EP 0418012 A2 EP0418012 A2 EP 0418012A2
Authority
EP
European Patent Office
Prior art keywords
time
particular region
given
given initial
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.)
Granted
Application number
EP90309871A
Other languages
English (en)
French (fr)
Other versions
EP0418012B1 (de
EP0418012A3 (en
Inventor
Katsuhiro Horiguchi
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
Publication of EP0418012A2 publication Critical patent/EP0418012A2/de
Publication of EP0418012A3 publication Critical patent/EP0418012A3/en
Application granted granted Critical
Publication of EP0418012B1 publication Critical patent/EP0418012B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to a world time­piece, which enables the user to know the times of the cities of the world.
  • One known world timepiece has time counting means for counting the time of a particular region, such as Japan, and given time counting means which, when a given initial time is set by the user for a given region, counts the time for the given region based thereon.
  • Such timepieces usually display the time of the particular region and the time of the given region in response to a switching operation. For instance, if 10:00 am has been counted and displayed in a particular region, such as Japan, the function for counting on the basis of a given initial time may be called and 9:00 pm may be set as the given initial time, e.g. for New York. The counting of the given time then continues for the time in New York and this time can be displayed as required.
  • a world timepiece comprising: means for calculating a time inclusive of date information for a particular region, input means for designating a given initial time, means for calculating a given time based on the given initial time, display means operable to display the time for the particular region and the given time, and characterised by means for calculating an international date line time, comparison means for comparing the international date line time, the time for the particular region and the given initial time, and means responsive to an output from the comparison means for determining a date for the given initial time.
  • said international date line time is compared with said particular region time and said international date line time is compared with said given initial time thereby to determine the date for said given initial time.
  • the time on the international date line (HI) is first calculated from the time in a particular region (WT).
  • the international date line time is compared with the particular region time, and the international date line time is compared with the given initial time.
  • results of comparison correspond to the same day, to the previous day, to the next day and to the same day respectively, relative to the date in the particular region.
  • the three times are compared with one another, i.e. the time on the international date line, the time in the particular region and the given initial time are compared with one another, and the date for the given initial time is determined from the results of comparison, i.e. deter­mined to be the previous day, the same day or the next day based on the date in the particular region.
  • Figure 1 is a block diagram showing the control system of a world timepiece according to the present invention.
  • a frequency dividing circuit 2 divides the frequency of an output oscillation of an oscillation circuit 1.
  • Timing control means 3 produces timing signals for various processing calculations and execution instructions in response to frequency divided output signals of the frequency dividing circuit 2.
  • a RAM 4 stores time data for the world timepiece. The procedure for operating the system is programmed in a ROM 5.
  • Display means 6 displays time data and the like of the world timepiece.
  • Calculation means 7 effects calculations, such as counting the time and comparing times.
  • Key input means 8 constitute input means for inputting a given initial time for a given region.
  • An address of the ROM 5 is determined by an output signal from the timing control means 3. Programming data from this address is sent to the calculation means 7 over a bus line 9.
  • the calculation means 7 decodes the programming data that it receives, processes data stored in the RAM 4, and supplies data for display by the display means 6, Further, any input through the key input means 8 is sensed, and processing is carried out according to the operating procedure programmed in the ROM 5.
  • FIG. 2 is a functional block diagram of the world timepiece of the present invention.
  • Time counting means 7 counts a given time and the time in a particular region. When it becomes necessary to correct the time, the time is corrected using a timepiece function key 10.
  • display control means 11 Upon receipt of inputs from a given time key 8 and a particular region designation key 9, display control means 11 displays the given time or the time of the particular region on display means 6.
  • Particular region time differential storage means 14 stores the time differentials of major cities (such as Tokyo, London, New York, etc.) of the world with the international date line as a reference.
  • particular region select means 12 is controlled by an input from the particular region designation key 9, a particular region desired by the user is selected out of a plurality of available particular regions.
  • time differential calculation means 20 calculates the time of the desired region based on the time data currently stored in the particular region time storage means 13 and the time differential data stored in the particular region time differential storage means 14.
  • the time of the particular region is calculated to include the date and is stored as data in the particular region time storage means 13. Further, the display means 6 displays the time of the desired region.
  • the particular region time storage means 13 is now storing the time in Tokyo, and the user wants to know the time in New York.
  • the particular region designation key 9 is manipulated to designate New York, the time is first calculated on the international date line using the time in Tokyo and the time differential between Tokyo and the inter­national date line. Then, the time in New York is calculated using the thus calculated time and the time differential between New York and the international date line. The calculated time in New York is stored in the particular region time storage means 13 and is displayed instead of the time in Tokyo.
  • a further function, described below, enables time counting on the basis of a set given initial time.
  • the user When the user feels the need of setting or changing the given time, he depresses the given time key, calls up the given time, and then sets the given time to a desired initial time using the time function key 10.
  • the date In terms of the twenty four hour system, there exist only 0 to 24 hours on the earth.
  • the date for the given initial time will be only one of three possibilities: namely, the previous day, the same day or the next day relative to the date in the particular region. Therefore, the previous day, the same day or the next day to which the date corresponds must be judged and may then be stored in the given time storage means 15.
  • the international date line time is calculated by international date line time calculation means 16 based on two items of data consisting of the particular region time stored in the particular region time storage means 13 and the particular region time differential stored in the particular region time differential storage means 14, and the data is stored in international date line time storage means 17 (step 1).
  • time comparator means 18 compares the particular region time with the international date line time (step 2). A judgement is thus made as to whether the particular region pertains to a zone A or a zone B represented in Figure 4.
  • the particular region pertains to zone A when the particular region time (WT) and the international date line time (HI) have a relationship HI ⁇ WT, and pertains to the zone B when HI ⁇ WT. For instance, when the particular region is Tokyo where the time is 4:00, the time on the international date line is 8:00. Due to the condition HI > WT, therefore, Tokyo 4:00 pertains to the zone A.
  • a next step compares the international date line time with the desired given initial time (DT) (step 3).
  • the method of discrimination differs in the case of the zone A and the case of the zone B.
  • the condition HI > DT represents the same day and the condition HI ⁇ DT represents the previous day (step 3-a).
  • the condition HI > DT represents the next day and the condition HI ⁇ DT represents the same day (step 3-b).
  • the condition HI ⁇ DT is fulfilled and, therefore, DT is the previous day relative to WT.
  • DT is the same day as WT. That is, if DT and WT pertain to the same zone, DT is the same day as WT, and, if they pertain to different zones, DT is the previous day or the next day relative to WT. The next day, the same day or the previous day is discriminated depending upon the results of final comparison of HI and DT.
  • the date -1 for the time in the particular region is regarded to be the date for the given initial time (step 4-a).
  • the date for the time in the particular region is regarded to be the date for the given initial time (step 4-b).
  • the date +1 for the time in the particular region is regarded to be the date for the given time (step 4-c).
  • the date for the given initial time is stored in the given time storage means 15.
  • the world timepiece of the present invention compares the time in a particular region with the time on the international date line, and compares the time on the international date line with a given initial time, in order to discriminate the date for the given initial time.
  • the thus determined date can be changed by changing the date in the particular region or by providing changing means that can be manipulated independently from the outside of the timepiece.
  • the world timepiece of the present invention auto­matically imparts the date for a set given time that may hold anywhere on the earth. Further, the user only has to bear a reduced burden of operation, and the date that is automatically imparted eliminates erroneous setting of the date.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
EP19900309871 1989-09-13 1990-09-10 Weltuhr Expired - Lifetime EP0418012B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP238078/89 1989-09-13
JP1238078A JPH03100489A (ja) 1989-09-13 1989-09-13 世界時計

Publications (3)

Publication Number Publication Date
EP0418012A2 true EP0418012A2 (de) 1991-03-20
EP0418012A3 EP0418012A3 (en) 1992-01-22
EP0418012B1 EP0418012B1 (de) 1994-02-23

Family

ID=17024831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900309871 Expired - Lifetime EP0418012B1 (de) 1989-09-13 1990-09-10 Weltuhr

Country Status (3)

Country Link
EP (1) EP0418012B1 (de)
JP (1) JPH03100489A (de)
DE (1) DE69006807T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0652497A2 (de) * 1993-11-05 1995-05-10 Seiko Instruments Inc. Elektronische Uhr
EP1293850A1 (de) * 2001-05-11 2003-03-19 Sony Corporation Informationsprozessor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2412613A1 (de) * 1973-03-16 1974-10-03 Hitachi Ltd Elektronische weltzeituhr
JPS5216268A (en) * 1975-07-28 1977-02-07 Casio Comput Co Ltd Data indicating apparatus
DE2812844A1 (de) * 1977-03-25 1978-10-12 Sharp Kk Elektronische uhr mit zeitanzeigemoeglichkeit fuer unterschiedliche zeitzonen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2412613A1 (de) * 1973-03-16 1974-10-03 Hitachi Ltd Elektronische weltzeituhr
JPS5216268A (en) * 1975-07-28 1977-02-07 Casio Comput Co Ltd Data indicating apparatus
DE2812844A1 (de) * 1977-03-25 1978-10-12 Sharp Kk Elektronische uhr mit zeitanzeigemoeglichkeit fuer unterschiedliche zeitzonen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1, no. 80 (E-77)(1404) 27 July 1977 & JP-A-52 016 268 ( KASIO KEISANKI K. K. ) 7 February 1977 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0652497A2 (de) * 1993-11-05 1995-05-10 Seiko Instruments Inc. Elektronische Uhr
EP0652497A3 (de) * 1993-11-05 1996-05-08 Seiko Instr Inc Elektronische Uhr.
EP1293850A1 (de) * 2001-05-11 2003-03-19 Sony Corporation Informationsprozessor
EP1293850A4 (de) * 2001-05-11 2006-05-03 Sony Corp Informationsprozessor
US7248292B2 (en) 2001-05-11 2007-07-24 Sony Corporation Imaging device with world standard time calculation and the ability to transmit said calculated time information

Also Published As

Publication number Publication date
EP0418012B1 (de) 1994-02-23
EP0418012A3 (en) 1992-01-22
JPH03100489A (ja) 1991-04-25
DE69006807T2 (de) 1994-07-14
DE69006807D1 (de) 1994-03-31

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