US3782103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving arrangement for liquid crystal display in timepieces
Assignee: Suwa Seikosha KK
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Filing: 1972-01-28
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Granted: 1974-01-01
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Expires: 1992-01-28
Abstract
Abstract A driving arrangement for liquid crystal displays for timepieces wherein the relatively low voltage of a battery is stepped up in response to the oscillating frequency of the time standard oscillator for application to the liquid crystal displays. Where said time standard vibrator is a piezo-electrically driven tuning fork type vibrator, the driving signal for said vibrator is also obtained from the secondary of the step-up transformer.
Inventors
- 👤 T Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:14
CPC Classifications
G; G04; G04G; G04G99/00; G04G99/003; G04C; G04C3/00; G04C3/08; G04C3/12; G04G19/00; G04G19/02; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0047
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
103 words
A timepiece comprising liquid crystal display means; time standard vibrator means; D.C. voltage source means; step-up transformer means having a primary and a secondary; first circuit means operatively coupling said D.C. voltage source means and said step-up transformer means primary and being coupled to said vibrator means for alternately connecting said D.C. voltage source means to said step-up transformer means in response to the frequency of oscillation of said time standard vibrator; and second circuit means operatively connecting said liquid crystal display means to said step-up transformer means secondary and for the selective actuation of said liquid crystal display means for time indication.
Claim 2
Dependent Claim
103 words
A timepiece comprising liquid crystal display means; time standard vibrator means; D.C. voltage source means; step-up transformer means having a primary and a secondary; first circuit means operatively coupling said D.C. voltage source means and said step-up transformer means primary and being coupled to said vibrator means for alternately connecting said D.C. voltage source means to said step-up transformer means in response to the frequency of oscillation of said time standard vibrator; and second circuit means operatively connecting said liquid crystal display means to said step-up transformer means secondary and for the selective actuation of said liquid crystal display means for time indication.
Claim 3
Dependent Claim
46 words
A timepiece as recited in claim 1, wherein said time standard vibrator is a piezo-electrically driven tuning fork type vibrator means having a detecting piezo-electric element and a driving piezo-electric element, said first circuit means being connected to said vibrator means at said detecting piezo-electric element.
Claim 4
Dependent Claim
27 words
A timepiece as recited in claim 2, wherein said driving piezo-electric element and said liquid crystal display means are connected together to said step-up transformer means secondary.
Claim 5
Dependent Claim
47 words
A timepiece as recited in claim 2, wherein said first circuit means includes a transistor means connected with its emitter-collector path in series with said D.C. voltage source means and said step-up transformer means primary, the base of said transistor being connected to said detecting piezo-electric element.
References Cited (Backward Citations)
GB1023668A
Cited
US3664116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |