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GB1343660A - Timepiece - Google Patents

Timepiece

Info

Publication number
GB1343660A
GB1343660A GB5676671A GB5676671A GB1343660A GB 1343660 A GB1343660 A GB 1343660A GB 5676671 A GB5676671 A GB 5676671A GB 5676671 A GB5676671 A GB 5676671A GB 1343660 A GB1343660 A GB 1343660A
Authority
GB
United Kingdom
Prior art keywords
liquid crystal
voltage
converter circuit
battery
circuit
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
GB5676671A
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.)
Suwa Seikosha KK
Original Assignee
Suwa Seikosha KK
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 Suwa Seikosha KK filed Critical Suwa Seikosha KK
Publication of GB1343660A publication Critical patent/GB1343660A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G9/00—Visual time or date indication means
    • G04G9/0023—Visual time or date indication means by light valves in general
    • G04G9/0029—Details
    • G04G9/0047—Details electrical, e.g. selection or application of the operating voltage
    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G19/00—Electric power supply circuits specially adapted for use in electronic time-pieces
    • G04G19/02—Conversion or regulation of current or voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electric Clocks (AREA)

Abstract

1343660 Electric watches SUWA SEIKOSHA K K 7 Dec 1971 [29 Dec 1970] 56766/71 Heading G3T In a battery powered electronic watch including a crystal controlled oscillator followed by a frequency divider and counters feeding timing data to a liquid crystal time display via a drive circuit Fig 4, while the oscillator, divider &c. which are composed of M.O.S.T. circuits, are energized continuously from the battery, a higher operating voltage for the liquid crystal is available on demand by closing a switch 7<SP>1</SP> Fig. 3 in a D.C./A.C./D.C. voltage step-up converter circuit. In the drive circuit Fig.4, each time a pulse is received at the base of a transistor 19 from the counter the output voltage of the converter circuit is applied to appropriate portions of the liquid crystal display 20, to indicate time. The converter circuit Fig.3 includes a pushpull transistor oscillator circuit (having a frequency of 500HZ-100KHZ) wherein a primary winding 11 on a toroidal ferrite core is connected to the collectors of transistors 8, 9 and the bases thereof are connected respectively to the ends of a detecting coil 12. The centre taps of winding 11 and coil 12 are joined via R13, C14. The resulting output voltage of a secondary winding 15 is full wave rectified and smoothed to provide say 20 volts from a battery voltage of 1.2.
GB5676671A 1970-12-29 1971-12-07 Timepiece Expired GB1343660A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12811770 1970-12-29

Publications (1)

Publication Number Publication Date
GB1343660A true GB1343660A (en) 1974-01-16

Family

ID=14976785

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5676671A Expired GB1343660A (en) 1970-12-29 1971-12-07 Timepiece

Country Status (3)

Country Link
US (1) US3750383A (en)
DE (1) DE2165421B2 (en)
GB (1) GB1343660A (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1339402A (en) * 1971-02-18 1973-12-05 Suwa Seikosha Kk Timepiece
US3946550A (en) * 1971-02-18 1976-03-30 Kabushiki Kaisha Suwa Seikosha Quartz crystal timepiece
US3999180A (en) * 1971-10-04 1976-12-21 Rockwell International Corporation Multiplex driver system for liquid crystal display
US3838564A (en) * 1972-06-19 1974-10-01 Texas Instruments Inc Oscillator
DE2365581C3 (en) * 1972-09-20 1979-01-18 Citizen Watch Co., Ltd., Tokio Voltage multiplier circuit
JPS49126068U (en) * 1973-02-23 1974-10-29
US4095408A (en) * 1973-07-24 1978-06-20 Casio Computer Co., Ltd. Watch device
US3981558A (en) * 1973-11-12 1976-09-21 Timex Corporation Liquid crystal electro-optical display
US3912977A (en) * 1974-05-20 1975-10-14 Rca Corp Direct current protection circuit
US3945196A (en) * 1974-05-30 1976-03-23 American Microsystems, Inc. Universal solid state time-keeping package
US3958169A (en) * 1974-09-24 1976-05-18 Burroughs Corporation Eliminating dc-dc converter switching transients in digital systems
JPS5159667A (en) * 1974-11-21 1976-05-24 Suwa Seikosha Kk
JPS5168797A (en) * 1974-12-11 1976-06-14 Canon Kk EKISHOSEIGYO HOSHIKI
US3999368A (en) * 1974-12-11 1976-12-28 Citizen Watch Co., Ltd. Circuit for an electronic timepiece
JPS5473079A (en) * 1977-11-22 1979-06-12 Copal Co Ltd Time indicator for electronic digital car clock
EP0018070B1 (en) * 1979-03-13 1983-01-05 National Research Development Corporation Analogue displays
IT1151747B (en) * 1982-04-27 1986-12-24 Montedison Spa TWO-COMPONENT SYNTHETIC FIBERS SUITABLE TO REPLACE CELULOSIC FIBERS IN PAPER AND EXTRA-PAPER FIELDS, AND PROCEDURE FOR THEIR PREPARATION
DE3842050A1 (en) * 1988-12-14 1990-06-21 Fraunhofer Ges Forschung Quartz timepiece with an analogue display device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668860A (en) * 1954-02-09 Process fob preparing aryloxy
US3560998A (en) * 1968-10-16 1971-02-02 Hamilton Watch Co Electronically controlled timepiece using low power mos transistor circuitry
US3672155A (en) * 1970-05-06 1972-06-27 Hamilton Watch Co Solid state watch

Also Published As

Publication number Publication date
DE2165421B2 (en) 1973-10-04
DE2165421A1 (en) 1972-07-27
US3750383A (en) 1973-08-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years