Patent US3742698A successfully refreshed from Google Patents.
US3742698A
Expired / Lapsed
US
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Circuit for quartz crystal timepiece
Assignee: Suwa Seikosha KK
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Filing: 1971-07-06
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Granted: 1973-07-03
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Expires: 1991-07-06
Abstract
Abstract A device for driving an electro-mechanical transducer of a timepiece from a quartz crystal oscillator including a switching circuit formed with an active element having an insulated gate type transistor and a bipolar type transistor. The electromechanical transducer is driven from said bipolar type transistor, which in turn is controlled and switched by the saturation current flowing through said insulated gate type transistor.
Inventors
- 👤 O Naito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:41
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
89 words
A driving arrangement for a quartz crystal wrist watch comprising a crystal oscillator for producing a high frequency timing signal; a divider electronic circuit coupled to said oscillator and driven by said timing signal; and an electromechanical transducer, said divider electronic circuit including an active element having an insulated gate type transistor and a bipolar type transistor, said electro-mechanical transducer being connected to said bipolar type transistor as a load, said bipolar type transistor being controlled and switched by the saturation current flowing through said insulated gate type transistor.
Claim 2
Dependent Claim
89 words
A driving arrangement for a quartz crystal wrist watch comprising a crystal oscillator for producing a high frequency timing signal; a divider electronic circuit coupled to said oscillator and driven by said timing signal; and an electromechanical transducer, said divider electronic circuit including an active element having an insulated gate type transistor and a bipolar type transistor, said electro-mechanical transducer being connected to said bipolar type transistor as a load, said bipolar type transistor being controlled and switched by the saturation current flowing through said insulated gate type transistor.
Claim 3
Dependent Claim
127 words
A driving arrangement for a quartz crystal wrist watch as recited in claim 1, wherein said electro-mechanical transducer includes a driving coil, said divider electronic circuit including at least two pairs of bipolar type transistors each having an emitter, collector and gate and being connected as a complementary switch means with said driving coil in series with the emitter to collector paths of each of said pair of bipolar type transistors for the alternate passing of driving current to said driving coil in opposite directions, said divider electronic circuit including at least one insulated gate type transistor connected to the gate of each of said bipolar type transistors for controlling and switching said bipolar type transistors by the saturation current flowing through said insulated gate type transistors.
Claim 4
Dependent Claim
47 words
A driving arrangement for a quartz crystal wrist watch as recited in claim 2, wherein said divider electronic circuit includes complementary pairs of insulated gate type transistors connected to the gate of each of said bipolar type transistors for control and switching of said bipolar type transistors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |