GB1482176A - Digital electronic watch - Google Patents

Digital electronic watch

Info

Publication number
GB1482176A
GB1482176A GB4678574A GB4678574A GB1482176A GB 1482176 A GB1482176 A GB 1482176A GB 4678574 A GB4678574 A GB 4678574A GB 4678574 A GB4678574 A GB 4678574A GB 1482176 A GB1482176 A GB 1482176A
Authority
GB
United Kingdom
Prior art keywords
depressed
display
displayed
driver
minutes
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
Application number
GB4678574A
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.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
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 Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of GB1482176A publication Critical patent/GB1482176A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • G04C3/08—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 mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
    • G04C3/10—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 mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
    • G04C3/101—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 mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means constructional details
    • G04C3/107—Controlling frequency or amplitude of the oscillating system
    • 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
    • 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
    • G04G9/082—Visual time or date indication means by building-up characters using a combination of indicating elements, e.g. by using multiplexing techniques using multiplexing techniques

Abstract

1482176 Electronic watches HUGHES AIRCRAFT CO 29 Oct 1974 [29 Oct 1973] 46785/74 Heading G3T [Also in Division G5] An electronic digital watch, Fig. 1, is provided with a liquid crystal display 40 which continuously displays hours and minutes in normal operation of the watch and with an L.E.D. display 41 which will display only on demand the hours and minutes e.g. when ambient light conditions are unsuitable for viewing the liquid crystal display. With push-switches 50, 52, Figs. 1 and 2, not depressed, hours and minutes are continuously displayed by the liquid crystal display 40. When switch 50 only is depressed seconds and tens of seconds only are displayed on devices 26, 28. When switch 52 only is depressed the date only is displayed on devices 26, 28. When both switches 50, 52 are depressed the time in hours and minutes will be displayed by the LED display 41. Additional counters may be provided to permit display of the month. In Fig. 2 a crystal controlled oscillator 60 followed by a CMOS frequency divider 62 produce timing pulses at 1Hz to drive CMOS counters 64, 66, 68, 70, 72, 74, 76, 78. The counters outputs are respectively coupled via transmission gates 92, 94, 96, 98, 100, 102, 104 to multi-plex inputs 84, 86, 88, 90 of a decoder 82. Each input, e.g. input 84, consists of four lines to carry BCD information from the counters when the respective transmission gates are opened by clock pulses from a multi-plex driver 106 via a line 105. The driver 106 also delivers digit select signals to a demulti-plexer unit 110 via a line 107. The decoder output is demultiplexed by the unit 110 which produces 7-segment outputs to each liquid crystal display device 24, 26, 28 via a respective memory driver 112, 114, 116 which continuously activate selected segments. Even when a gate blocks information from a counter, the memory driver will maintain displayed the previous information received thereby. An output 109 from multi-plex driver 106 determines which LED display device will receive information from decoder 82 when switches 50, 52 are both depressed. The watch may be arranged to display also the seconds and date on the LED display.
GB4678574A 1973-10-29 1974-10-29 Digital electronic watch Expired GB1482176A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US41074473A 1973-10-29 1973-10-29

Publications (1)

Publication Number Publication Date
GB1482176A true GB1482176A (en) 1977-08-10

Family

ID=23626038

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4678574A Expired GB1482176A (en) 1973-10-29 1974-10-29 Digital electronic watch

Country Status (4)

Country Link
JP (1) JPS5075461A (en)
FR (1) FR2249381B1 (en)
GB (1) GB1482176A (en)
HK (1) HK14778A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2730983A1 (en) * 2012-11-13 2014-05-14 ETA SA Manufacture Horlogère Suisse Activation mode of an electronic watch

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026101A (en) * 1975-05-27 1977-05-31 Hughes Aircraft Company Push button response of combination LCD/LED wristwatch
JPS5223968A (en) * 1975-08-18 1977-02-23 Seiko Instr & Electronics Ltd Digital alarm watch
DE2817655C2 (en) * 1977-04-22 1985-02-28 Kabushiki Kaisha Seikosha, Tokio/Tokyo Electronic clock

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2730983A1 (en) * 2012-11-13 2014-05-14 ETA SA Manufacture Horlogère Suisse Activation mode of an electronic watch
WO2014076008A2 (en) * 2012-11-13 2014-05-22 Eta Sa Manufacture Horlogère Suisse Mode of activation of an electronic watch
WO2014076008A3 (en) * 2012-11-13 2014-07-10 Eta Sa Manufacture Horlogère Suisse Mode of activation of an electronic watch
CN104781736A (en) * 2012-11-13 2015-07-15 Eta瑞士钟表制造股份有限公司 Mode of activation of electronic watch
US9417613B2 (en) 2012-11-13 2016-08-16 Eta Sa Manufacture Horlogere Suisse Activation mode of an electronic watch
CN104781736B (en) * 2012-11-13 2017-08-04 Eta瑞士钟表制造股份有限公司 The activation pattern of electronic watch

Also Published As

Publication number Publication date
FR2249381B1 (en) 1983-12-09
HK14778A (en) 1978-03-23
FR2249381A1 (en) 1975-05-23
JPS5075461A (en) 1975-06-20

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee