GB1343660A - Timepiece - Google Patents
TimepieceInfo
- 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
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.
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)
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 |
US3828548A (en) * | 1972-06-19 | 1974-08-13 | Texas Instruments Inc | Liquid crystal drive circuit |
DE2347404C2 (en) * | 1972-09-20 | 1982-08-19 | Citizen Watch Co., Ltd., Tokyo | Voltage booster circuit for watches |
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 | |
US3999368A (en) * | 1974-12-11 | 1976-12-28 | Citizen Watch Co., Ltd. | Circuit for an electronic timepiece |
JPS5168797A (en) * | 1974-12-11 | 1976-06-14 | Canon Kk | EKISHOSEIGYO HOSHIKI |
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)
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 |
-
1971
- 1971-12-07 GB GB5676671A patent/GB1343660A/en not_active Expired
- 1971-12-27 US US00212248A patent/US3750383A/en not_active Expired - Lifetime
- 1971-12-29 DE DE2165421A patent/DE2165421B2/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
US3750383A (en) | 1973-08-07 |
DE2165421B2 (en) | 1973-10-04 |
DE2165421A1 (en) | 1972-07-27 |
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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 |