US3911665A - Electronic timepiece having complementary electro-optical and electro-mechanical displays - Google Patents

Electronic timepiece having complementary electro-optical and electro-mechanical displays Download PDF

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Publication number
US3911665A
US3911665A US432935A US43293574A US3911665A US 3911665 A US3911665 A US 3911665A US 432935 A US432935 A US 432935A US 43293574 A US43293574 A US 43293574A US 3911665 A US3911665 A US 3911665A
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United States
Prior art keywords
electro
display means
light
time
display
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US432935A
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English (en)
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Berkum Petrus A Van
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.)
Zenith Electronics LLC
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Zenith Radio Corp
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Application filed by Zenith Radio Corp filed Critical Zenith Radio Corp
Priority to US432935A priority Critical patent/US3911665A/en
Priority to CA214,384A priority patent/CA1028156A/en
Priority to GB5464674A priority patent/GB1462898A/en
Priority to JP50006211A priority patent/JPS50108964A/ja
Priority to CH35475D priority patent/CH35475A4/xx
Priority to CH35475A priority patent/CH594930B/de
Priority to US05/578,701 priority patent/US3945191A/en
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Publication of US3911665A publication Critical patent/US3911665A/en
Assigned to FIRST NATIONAL BANK OF CHICAGO, THE reassignment FIRST NATIONAL BANK OF CHICAGO, THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZENITH ELECTRONICS CORPORATION A CORP. OF DELAWARE
Assigned to ZENITH ELECTRONICS CORPORATION reassignment ZENITH ELECTRONICS CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: FIRST NATIONAL BANK OF CHICAGO, THE (AS COLLATERAL AGENT).
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C17/00—Indicating the time optically by electric means
    • 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
    • G04C3/008—Mounting, assembling of components
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0023—Visual time or date indication means by light valves in general
    • 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

  • This invention relates to electronic timepieces, herein intended to mean timepieces of the type having an electronic oscillator, such as a quartz crystal oscillator, serving as a stable source of regular electrical pulses which constitute the time standard for the timepiece.
  • an electronic oscillator such as a quartz crystal oscillator
  • a modern electronic wristwatch or other body-worn timepiece must have certain basic features and capabilities, including the following (not necessarily in the order disscussed). It must be accurateerrors of less than about seconds per month are expected.
  • the power requirements must be sufficiently low so that frequent replacement of the battery or batteries is not required.
  • the timepiece in the case of wristwatches, the timepiece must be compact, particularly in the thickness dimension, in order that the watch does not interfere with clothing and is not otherwise burdensome to wear.
  • the timepiece must be convenient in its operation and have a highly visible time display-preferably a display which is highly visible under low as well as high level ambient lighting conditions. Fifthly, the cost of acquiring and maintaining the timepiece must be reasonable.
  • This invention is applicable to horological instruments in general, however, it is believed to be most advantageously adapted for exploitation in a wristwatch; accordingly, the ensuing discussion will be based. on wristwatch implementations of the invention.
  • This invention is directed to providing an improved electronic watch, i.e., a watch having an electronic oscillator as a time standard and having either an electro-mechanical or an electro-optical time display.
  • a watch having an electronic oscillator as a time standard and having either an electro-mechanical or an electro-optical time display.
  • One type of commercially available electronic watch utilizes an electromechanical time display comprising a pulse-driven stepping motor coupled through a transmission (typically a gear train to a set of hour, minute and second hands.
  • the stepping motor may also drive ancillary time display devices such as day and/or date dials.
  • the stepping motor input is a stable train of electrical pulses supplied from a logic circuit at a 1 Hz rate.
  • the pulses cause the stepping motor rotor to incrementally advance one step per second.
  • the rotor drives the watch second, minute and hour hands through an intermediate gear train.
  • Electro-optical displays are herein intended to means solid state or liquid state displays in which an optical pattern is created by the application of a pattern of voltages.
  • the light-emitting or light-affecting (light-reflecting or light-absorbing) elements are arranged in segments, typically seven segments per digit displayed.
  • the individual segments are selectively energized in patterns according to patterns of applied voltages to determine the digit displayed.
  • the other type of electronic watch namely the type having an electro-optical display for presenting time functions, also have drawbacks which have, to date, limited the market for such watches.
  • the watches which employ LED (light-emitting diode) displays suffer from having undersirably large power requirements which neccessitate that the time display the operated only on command. This is considered by many consumers to be a great inconvenience since he has not been accustomed to be thus inconvenienced to learn the time of day.
  • watches of the type having LED displays are more bulky than the consumer would like. They have, however, enjoyed prestige as a result of the novel, eye-catching light-emissive character of their displays.
  • Electronic watches having LED displays are readable at night and thus have a significant advantage in this respect over non-self-illuminated time display devices.
  • Electronic watches having electro-optical displays of the LC (liquid crystal) type utilize less power than watches employing LED s, however to date liquid crystal displays have not yet proven to have a satisfactorily long life. Liquid crystal displays also suffer from being inconvenient to read due to the low contrast of the display at certain viewing angles and in adverse lighting conditions. Electronic watches having LC displays have also proven to be undesirably cumbersome and bulky.
  • U.S. Pat. No. 3,668,861Mitsui discloses an electronic watch which has electro-mechanically driven day and date displays and a pair of electrooptical hour/minute displays.
  • the electro-optical hour/minute displays comprise discrete, parallelfunctioning LC and LED displays.
  • FIG. 1 is an exploded, somewhat schematic, perspective view, shown partly in structure and partly in block diagram form, of an electronic watch embodying the principles of this invention
  • FIG. 2 is a view of the FIG. 1 watch as it would appear from the top with the crystal and dial removed;
  • FIG. 3 is a sectional view taken generally along the lines 3-3 in FIGS. 1 and 2;
  • FIGS. 4 and 5 are plan views of electronic watches representing alternative embodiments of the invention.
  • FIG. 1 depicts an electronic watch representing a preferred execution of the principles of the invention.
  • the FIG. 1 watch is illustrated as comprising a housing 10 adapted to receive over the open top side thereof a dial 12 and a protective transparent crystal 14.
  • the watch embodies, in accordance with the teachings of this invention, means including an electronic oscillator for generating a train of highly regular pulses serving as the time standard for the watch, and complementary electro-mechanical and electro-optical displays for presenting time-related functions.
  • electro-optical displays suffered from their own set of drawbacks, including high power consumption in the case of LED (light-emitting diode) displays, and poor visibility and short life in the case of todays LC (liquid crystal) displays. It was also noted that conventional electronic watches having either electro-optical or electro-mechanical displays are undesirably bulky and inconvenient to wear.
  • the time functions normally associated with body-wom timepieces namely hours, minutes, seconds, day and date
  • one category which is herein termed the high use factor or high duty category
  • the hours and minutes time functions those time functions which are necessary and sufficient to indicate the time of day to a degree of accuracy which is satisfactory except perhaps on rare occasions.
  • a second category are placed the remaining time functions which have a relatively low use factor namely, seconds, day and date.
  • These latter time functions are sought relatively infrequently by comparison with the frequency with which the time of day is sought.
  • Another latter category time function is lapsed time.
  • the time functions in the first category are presented continuously by means of an electro-mechanical display, preferably a stepping motor driving hour and minute hands through a conventional gear train.
  • an electro-mechanical display preferably a stepping motor driving hour and minute hands through a conventional gear train.
  • the electro-mechanical display need only the actuated once per minute, rather than once per second, yielding a sixty-fold reduction in motor power consumption over that required to continuously present the seconds time function as well as the hours and minutes time functions. This is accomplished without sacrificing the continuous readability of the time of day which the consumer has come to expect to be associated with timepieces.
  • One or more of the constituents of the second category of time functions are presented to the wearer by means of an electro-optical display such as an LED (light-emitting diode) or LC (liquid crystal) display either intermittently or on command.
  • an electro-optical display such as an LED (light-emitting diode) or LC (liquid crystal) display either intermittently or on command.
  • the electro-mechanical and electrooptical displays 16, 18 are driven from a common electrical energy source, here shown as a pair of serially connected batteries 20,. 22 which power a common source of electrical drive pulses.
  • the common source of drive pulses includes an electronic oscillator, here shown in the form of a quartz crystal oscillator 24 which may, for example, be chosen to oscillate at a predetermined frequency such as 32,768 I-Iz.
  • the quartz crystal oscillator 24 supplies pulses at 32,768 Hz to a frequency divider 26, here shown to have the capability of dividing by 32,768. At the output of the divider 26 there is developed regular pulses at the rate of l per second.
  • the 1 Hz pulses are supplied to a minute counter 28. From the minute counter pulses at the rate of 1 per minute are developed which are supplied to the electro-mechanical display 16.
  • the electro-mechanical display 16 is here shown as comprising a stepping motor 32 which drives a minute hand 33 and an hour hand 34 through a conventional gear train.
  • the minute hand 33 is driven through a pinion 36, spur gear 38 and minute gear 40, to which is affixed a sleeve 43 carrying the minute hand 33.
  • the sleeve rotates about a support post 41.
  • the pinion 36 and gears 38, 40 effect a 10:1 gear reduction.
  • the hour hand 34 is driven at a l /12 the rate of the minute hand 33 through gear 42 affixed to gear 38 which drives hour gear 44.
  • a sleeve 46 affixed to the hour gear 44 carries the hour hand 34.
  • a crown 47 provides for time setting; the associated gearing may be of conventional construction and is not shown.
  • the 1/60 l-Iz pulses emitted by the minute counter 28 causes the stepping motor 32 to rotate by 60 per pulse, resulting in a 6 rotation of the minute hand 33 for each minute pulse.
  • the hour hand 34 is driven at a rate of 05 per minute pulse.
  • the electro-optical display 18 is illustrated as comprising a light-emissive cell and display drive circuitry 54 for driving the display cell.
  • the drive circuitry 54 is, per se, constructed according to well-known design principles, receiving pulses from a date divider 55 at 1 pulse per day, from the minute counter 28 at 1 pulse per minute and from the frequency divider 26 at 1 pulse per second and developing therefrom patterns of voltages determinative of the digits displayed by the cell.
  • the cell may be of various types such as LCs or other types of light-absorptive or light-reflective devices, however it is preferably of the light-emissive type such as LEDs (light-emitting diodes) as shown.
  • the cell is illustrated as comprising a pair of seven segments digits 56, 58, each segment (one of which is shown as comprising a row of discrete light-emitting diodes (one of which is shown at 62).
  • the seven segments of the digits and the ground electrodes are coupled by leads to the drive circuitry 54.
  • corresponding segments of the digits 56, 58 are coupled together and separate ground electrodes provided to permit sequential energization of the digits and consequent reduction in the cost of the display.
  • the drive circuitry 54 comprises a system of counters, shift registers and other logic functions which act in accordance with a predetermined logic program, all as is well known, to convert the received 1 Hz, l/60 Hz and one per day pulses to a pattern of voltages applied through the leads to determine the digit displayed.
  • the electronic circuitry for the watch (preferably wholly of integrated circuit form), i.e., those components shown schematically in FIG. 1 within the dotted line box 57, in actual structure are contained within package 56.
  • the cell in the illustrated preferred embodiment, also includes a single light-emitting diode, or group of diodes, acting as a seconds marker 64 which is caused to flash at a 1 Hz rate.
  • the two digits 56, 58 are used to display the data on command by depression of a date select switch 66.
  • the data select switch is shown schematically at 66 and is shown as it might appear in structure at 66, mounted on the watch housing for manual actuation by the user.
  • both of the time-related functions presented by the electrooptical display are normally off and are energized only on command.
  • the data display is energized by a manual command issued by the user; the flashing seconds marker 64 flashes automatically on commands from the drive circuitry 54.
  • presentation of the least-used time functions (by the electro-optical display 18) drain the batteries 20, 22 only commensurately with their relative use factor.
  • FIG. 1 system is illustrated as including, coupled to the drive circuitry 54, a data set switch 68 (shown in more structural form at 68'). Since the drive circuitry 54 and the associated switches 66, 68 constitute no part, per se, of this invention, they are disclosed herein only schematically. The construction of the drive circuitry 54 is within the routine skill of logic designers.
  • the electro-optical display 18 is of the LED variety. LED displays of the type commercially available at this time require a voltage which can only be obtained by adding in series two batteries of the commercially available type suitable for use in Wristwatches.
  • battery 20 has a relatively large physical size and storage capacity, however, the battery 22, which is connected in series with battery 20, is preferably caused to have a relatively small physical size and storagecapacity.
  • the collective space occupied by the watch batteries is substantially reduced over what it would be if two relatively large batteries were employed.
  • An electronic watch as shown in FIGS. l-3 preferably includes the following components with the indicated major dimensions: motor (32) 7 X 3.2 mm; quartz crystal (24) 13.8 X 3.3 X 4.3 mm; two digit LED display (18) 9 X 6.5 X 1.5 mm; trimming capacitor (not shown) X 2 mm; integrated circuit package (57') 10 X 6.6 X 3.6 mm; battery (silver oxide, 1.5 volts, 120 mAH) 11.4 X 4.3 mm; and battery (22) (silver oxide, 1.5 volts, 38 mAI-I) 7.6 X 3.5 mm.
  • the described electronic watch would have a movement outer diameter of about 32 mm.
  • the movement outer diameter may be reduced to about 28 mm.
  • the electro-optical display 18 requires a voltage equal to the sum of the voltages produced by the batteries 20, 22; therefore the electro-optical display 18 is coupled across the series combination of batteries 20 and 22.
  • the integrated circuit components 57 comprie ing the quartz crystal oscillator 24, frequency divider 26, minute counter 28, data divider 55, and part of the drive circuitry 54, are all coupled across only the battery 20, as shown schematically by the ground symbol and battery connection conductor on each of these components.
  • the battery. connection conductors are shown as interrupted form for clarity of illustration; the interruptions are tied by the break symbols aa, b--b, cc, dd and e-e, respectively.
  • the electromechanical display may be coupled across battery 20 or the series combination of batteries 20 and 22 since its current drain is low compared with that of either the LED display 18 or the components 57.
  • the power drain by the LED electro-optical display is relatively low, since it is read out on command only; the motor 32 requires a drive pulse only once per minute.
  • the series combination of batteries 20 and 22, as described, is very adequate to power the watch.
  • the lifetime of the batteries 20, 22 under normal use is expected to be one year or greater.
  • a second provision according to this invention which results in a highly compact movement involves the size of the batteries required.
  • the teachings of this invention result in an electronic watch having an LED display and having the favorable characteristics described, yet which consumes so little power that the unusually small batteries described may be used. This results in an extremely small watch by comparison with other electronic watches having LED displays. There is set forth below a comparison of the sizes of the batteries used in the FIGS. l-3 watch movement with the sizes of the batteries used in certain commercially now available quartz crystal controlled, all-LED display Wristwatches:
  • This objective is met by the use of an electro-optical display of the light-emissive type, such as the LED display described.
  • the electro-optical display may be operated in a number of modes to achieve this end without causing unnecessary drain on the-batteries 20, 22.
  • a first mode is to cause the electro-optical display, in whole or in part, to flash intermittently. This mode is performed by the above-described seconds marker 64 which is caused to flash at a 1 Hz rate.
  • a second mode is implemented in the data display portion of the electro-optical display 18 which is energized only on command by the user.
  • the date may be accessed by closing data switch 66 to obtain a reading of hours and minutes in the light cast by the activated digits 56, 58.
  • a flashing marker alone such as the seconds marker shown at 64, or other intermittent flashing display (such as a flashing date display), or other user-commandable displays may be used individually or in combination (as shown) to achieve the afore-stated object of providing a lightemissive time display acting secondarily as a source of illumination for a complementary non-light-emissive time display.
  • FIG. 4 shows a flashing LED seconds marker 71.
  • FIG. 5 illustrates a watch having the general structure shown in FIG. 1, but including a liquid crystal display 74 comprising two seven-segment digits.
  • the display 74 is driven from a drive circuit 76 adapted to receive pulses of the character described above with respect to the FIG. 1 system and to produce therefrom patterns of voltages effective to determine the digits to be displayed.
  • a compact electronic watch capable of displaying multiple time-related functions at relatively low levels of power consumption, comprising within a housing;
  • first electrical storage battery having a relatively large physical size and storage capacity connected in series to a second electrical storage battery having a relatively small physical size and storage capacity
  • pulse-drivable electro-mechanical time display means for displaying the hours and minutes of the y
  • normally-off electro-optical display means coupled across said first and second batteries in series for displaying at least one additional time-related function having a lower normal use factor than hours and minutes;
  • a compact electronic watch capable of displaying multiple time-related functions at relatively low levels of power consumption, comprising within a housing:
  • pulse-drivable, non-light-emissive time display means for displaying the hours and minutes of the day;
  • normally-off light-emissive display means coupled across said first and second batteries in series for displaying at least one additional time-related function having a lower normal use factor than hours and minutes, said light-emissive display means being disposed such that light emitted thereby illuminates said non-light-emissive display means;
  • control means coupled across said first battery only for generating electrical signals for supply to said non-li'ght-emissive display means to drive said nonlight-emissive display means in order that hours and minutes, the most-used time functions, are displayed continuously for the convenience of the user,
  • control means developing a control signal for activating said light-emissive display means displaying the less-used additional time function and to illuminate the non-light-emissive display means only on command whereby to conserve stored energy in the battery means.

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  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Electromechanical Clocks (AREA)
US432935A 1974-01-14 1974-01-14 Electronic timepiece having complementary electro-optical and electro-mechanical displays Expired - Lifetime US3911665A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US432935A US3911665A (en) 1974-01-14 1974-01-14 Electronic timepiece having complementary electro-optical and electro-mechanical displays
CA214,384A CA1028156A (en) 1974-01-14 1974-11-21 Electronic timepiece having complementary electro-optical and electro-mechanical displays
GB5464674A GB1462898A (en) 1974-01-14 1974-12-18 Electronic timepiece
CH35475D CH35475A4 (de) 1974-01-14 1975-01-13
JP50006211A JPS50108964A (de) 1974-01-14 1975-01-13
CH35475A CH594930B (de) 1974-01-14 1975-01-13 Elektronische uhr.
US05/578,701 US3945191A (en) 1974-01-14 1975-05-19 Electronic timepiece having complementary electro-optical and electro-mechanical displays

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US432935A US3911665A (en) 1974-01-14 1974-01-14 Electronic timepiece having complementary electro-optical and electro-mechanical displays

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US05/578,701 Division US3945191A (en) 1974-01-14 1975-05-19 Electronic timepiece having complementary electro-optical and electro-mechanical displays

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US3911665A true US3911665A (en) 1975-10-14

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JP (1) JPS50108964A (de)
CA (1) CA1028156A (de)
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GB (1) GB1462898A (de)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968641A (en) * 1975-05-12 1976-07-13 Hughes Aircraft Company Digital watch with oscillator/divider power selection circuitry
US4009566A (en) * 1975-05-27 1977-03-01 Hughes Aircraft Company Digital watch with liquid crystal and sequentially read out light emitting diode displays
US4051664A (en) * 1975-09-09 1977-10-04 Kabushiki Kaisha Daini Seikosha Drive circuit of light emitting means for liquid crystal electronic watch
FR2416503A1 (fr) * 1978-01-31 1979-08-31 Junghans Gmbh Geb Montre electronique
DE2910736A1 (de) * 1978-03-29 1979-10-04 Suisse Horlogerie Uhr mit analog- und digitalanzeige
US4175372A (en) * 1976-03-16 1979-11-27 Citizen Watch Co. Ltd. Electronic timepiece
DE2821619A1 (de) * 1978-05-18 1980-02-07 Junghans Gmbh Geb Uhr mit hybridanzeige
US4198810A (en) * 1977-07-02 1980-04-22 Braun Ag Analog-digital chronometric display
US4228648A (en) * 1978-10-11 1980-10-21 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Hour hand corrector for dual display timepiece
US4242747A (en) * 1977-07-21 1980-12-30 Braun Ag Analog-digital chronometric display
US4245338A (en) * 1977-11-10 1981-01-13 Citizen Watch Company Limited Time correction system for an electronic timepiece
EP0022255A1 (de) * 1979-07-06 1981-01-14 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Elektronische Armbanduhr mit zwei verschiedenen Anzeigen
US4246602A (en) * 1977-12-09 1981-01-20 Citizen Watch Company Limited Electronic timepiece
US4253173A (en) * 1979-10-15 1981-02-24 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Dual display synchronization system for a timepiece
US4258431A (en) * 1977-12-09 1981-03-24 Citizen Watch Co., Ltd. Electronic timepiece having an analog display device and a digital display device
US4264970A (en) * 1977-10-28 1981-04-28 Citizen Watch Company Limited Liquid crystal display cell for an electronic timepiece
US4290131A (en) * 1978-04-06 1981-09-15 Citizen Watch Company Limited Electronic timepiece
US4306302A (en) * 1978-03-31 1981-12-15 Citizen Watch Company Limited Electronic timepiece
US4312056A (en) * 1979-01-17 1982-01-19 Citizen Watch Company Limited Composite display type electronic timepiece
US4319350A (en) * 1979-06-01 1982-03-09 Ebauches Electroniques S.A. Electronic watch
US4320484A (en) * 1979-06-13 1982-03-16 Societe Suisse Pour L'industrie Horlogere Management Services S.A. Electro-optical analog digital display
US4320479A (en) * 1978-12-29 1982-03-16 Citizen Watch Co., Ltd. Analogue electronic timepiece with an alarm device
US4335453A (en) * 1979-06-01 1982-06-15 Ebauches Electroniques S.A. Electronic watch
US4355380A (en) * 1979-06-28 1982-10-19 Ebauches, S.A. Electronic timepiece with auxiliary digital display
WO1983002340A1 (fr) * 1981-12-28 1983-07-07 Dubois, Jean-Daniel Module d'horlogerie comprenant un circuit electronique et un dispositif de calendrier
CH668350GA3 (en) * 1987-05-22 1988-12-30 Electric timepiece with inter module connection driving seconds hand - has gearing for centre second-hand wheel in one module rotated by motor in other module
EP0553722A2 (de) * 1992-01-28 1993-08-04 Junghans Uhren Gmbh Kleine autonome analog anzeigende Funkuhr, insbesondere Funkarmbanduhr
WO2000028387A1 (en) 1998-11-05 2000-05-18 Fossil, Inc. Timepiece and chronometer with overlapping, separately driven analog and digital displays
US6084828A (en) * 1998-11-05 2000-07-04 Fossil, Inc. Timepiece and chronometer with overlapping, separately driven analog and digital displays
US6304518B1 (en) 1999-04-12 2001-10-16 Quartex Division Of Primex Inc. Clockworks, timepiece and method for operating the same
US20030165086A1 (en) * 2002-03-01 2003-09-04 Brewer Donald R. Compact color changing LCD watch
US20070012134A1 (en) * 2005-07-15 2007-01-18 Rolex S.A. Defect-compensating gear assembly for a timepiece mechanism
US20080013409A1 (en) * 2006-07-11 2008-01-17 Bland Diarmuid John St Cullom Timepiece with overlapping, separately driven analog and mechanical functionality
US20170097614A1 (en) * 2015-10-01 2017-04-06 Lg Electronics Inc. Electronic device

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DE2804041C3 (de) * 1978-01-31 1983-11-17 Gebrüder Junghans GmbH, 7230 Schramberg Elektronische Uhr

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US2542021A (en) * 1946-07-16 1951-02-20 Fox Benjamin Electronic display system
US3668861A (en) * 1970-11-17 1972-06-13 Suwa Seikosha Kk Solid state electronic watch
US3747322A (en) * 1971-05-20 1973-07-24 Hmw Industries Light control for timing displays
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US2542021A (en) * 1946-07-16 1951-02-20 Fox Benjamin Electronic display system
US3668861A (en) * 1970-11-17 1972-06-13 Suwa Seikosha Kk Solid state electronic watch
US3802182A (en) * 1971-02-25 1974-04-09 Suwa Seikosha Kk Timepiece with flickering digital display
US3747322A (en) * 1971-05-20 1973-07-24 Hmw Industries Light control for timing displays

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968641A (en) * 1975-05-12 1976-07-13 Hughes Aircraft Company Digital watch with oscillator/divider power selection circuitry
US4009566A (en) * 1975-05-27 1977-03-01 Hughes Aircraft Company Digital watch with liquid crystal and sequentially read out light emitting diode displays
US4051664A (en) * 1975-09-09 1977-10-04 Kabushiki Kaisha Daini Seikosha Drive circuit of light emitting means for liquid crystal electronic watch
US4175372A (en) * 1976-03-16 1979-11-27 Citizen Watch Co. Ltd. Electronic timepiece
US4198810A (en) * 1977-07-02 1980-04-22 Braun Ag Analog-digital chronometric display
US4242747A (en) * 1977-07-21 1980-12-30 Braun Ag Analog-digital chronometric display
US4264970A (en) * 1977-10-28 1981-04-28 Citizen Watch Company Limited Liquid crystal display cell for an electronic timepiece
US4245338A (en) * 1977-11-10 1981-01-13 Citizen Watch Company Limited Time correction system for an electronic timepiece
US4246602A (en) * 1977-12-09 1981-01-20 Citizen Watch Company Limited Electronic timepiece
US4258431A (en) * 1977-12-09 1981-03-24 Citizen Watch Co., Ltd. Electronic timepiece having an analog display device and a digital display device
FR2416503A1 (fr) * 1978-01-31 1979-08-31 Junghans Gmbh Geb Montre electronique
DE2910736A1 (de) * 1978-03-29 1979-10-04 Suisse Horlogerie Uhr mit analog- und digitalanzeige
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Also Published As

Publication number Publication date
CA1028156A (en) 1978-03-21
GB1462898A (en) 1977-01-26
JPS50108964A (de) 1975-08-27
CH594930B (de) 1978-01-31
CH35475A4 (de) 1977-02-15

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