US3942318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time correction device for digital indication electronic watch
Assignee: Suwa Seikosha KK
•
Filing: 1974-03-04
•
Granted: 1976-03-09
•
Expires: 1994-03-04
Abstract
Abstract A digital indication electronic wristwatch having a liquid crystal display panel driven by the output of a standard oscillator through frequency divider circuitry. Time regulation is provided by means of a first switch for resetting the entire frequency dividing circuit and a second switch for individually resetting that portion of the frequency divider circuit whose output corresponds to a 1-second or 1-minute signal. If desired, further switches may be provided for individually resetting those portions of the frequency divider circuit whose output corresponds respectively to the 10-second, 10-minute or 1-hour signal.
Inventors
- 👤 Kinji Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:33
CPC Classifications
G; G04; G04G; G04G5/00; G04G5/04; G04F; G04F5/00; G04F5/04; G04F5/06; G04G9/00; G04G9/08; G04G9/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
327 words
In a digital indication electronic wristwatch comprising standard high frequency oscillator means; frequency divider circuit means coupled to said oscillator means for dividing the frequency output thereof into time indication signals, said frequency divider circuit means being formed of COS/MOS circuit elements and including a plurality of series connected stages, said divider stages being adapted to each advance in count by one upon the application of each pulse to the input thereof, the count of each of a plurality of said divider stages producing time indication signals representative of a digit of time; digital display means adapted for the digital display of said digits of time; means coupled to said frequency divider circuit means for receiving said time indication signals therefrom and to said display means for applying said time indication signals representative of digits of time to corresponding digits of said display means for driving said display means; and time correction means including a source of d.c. voltage, a manually operable time correction switch and means connecting said switch in series with said d.c. voltage source and the input of one stage of said frequency divider circuit means associated with at least one digit of time display of said display means so that said switch is positioned between said d.c. voltage source and said input of said one stage of said frequency divider circuit and so that said switch is out of the series connection of said divider stages, said switch controlling the application of said d.c. voltage to the input of said one stage to apply a pulse to said one stage for each manual operation of said switch for advancing the count of said stage by one for each manual operation of said switch without opening the circuit between said one stage and the stage in advance of said one stage, so that the associated digit of time advanced by one for each manual operation of said switch is displayed on said display means.
Claim 2
Dependent Claim
327 words
In a digital indication electronic wristwatch comprising standard high frequency oscillator means; frequency divider circuit means coupled to said oscillator means for dividing the frequency output thereof into time indication signals, said frequency divider circuit means being formed of COS/MOS circuit elements and including a plurality of series connected stages, said divider stages being adapted to each advance in count by one upon the application of each pulse to the input thereof, the count of each of a plurality of said divider stages producing time indication signals representative of a digit of time; digital display means adapted for the digital display of said digits of time; means coupled to said frequency divider circuit means for receiving said time indication signals therefrom and to said display means for applying said time indication signals representative of digits of time to corresponding digits of said display means for driving said display means; and time correction means including a source of d.c. voltage, a manually operable time correction switch and means connecting said switch in series with said d.c. voltage source and the input of one stage of said frequency divider circuit means associated with at least one digit of time display of said display means so that said switch is positioned between said d.c. voltage source and said input of said one stage of said frequency divider circuit and so that said switch is out of the series connection of said divider stages, said switch controlling the application of said d.c. voltage to the input of said one stage to apply a pulse to said one stage for each manual operation of said switch for advancing the count of said stage by one for each manual operation of said switch without opening the circuit between said one stage and the stage in advance of said one stage, so that the associated digit of time advanced by one for each manual operation of said switch is displayed on said display means.
Claim 3
Dependent Claim
112 words
A digital indication electronic wristwatch as recited in claim 1, wherein said d.c. voltage source is a source of a high potential, said time correction means including capacitor means connected in the series connection of said divider stages at a position between the output of the stage in advance of said one stage and said one stage, said switch being connected to the input of said one stage through a point in the series connection of said divider stages located between said capacitor means and said input of one stage, a source of a low potential, and resistor means connected between said low potential source and said point in said series connection.
References Cited (Backward Citations)
US3596462A
Cited
US3668859A
Cited
US3678680A
Cited
US3672155A
Cited
US3742698A
Cited
US3795098A
Cited
US3707071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |