US3568093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated oscillator using temperature controlled continual switching of frequency determining impedance
Assignee: Citizen Watch Co Ltd
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Filing: 1968-12-23
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Granted: 1971-03-02
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Expires: 1988-12-23
Abstract
Abstract Method of and device for compensating the temperature variation in the oscillation frequency of an oscillator wherein an impedance element, for example, a capacitor coupled to the oscillator is switched between two levels of its value, whereby the temperature variation is compensated for on an average.
Inventors
- 👤 Fujio Ishida
- 👤 Yoshiaki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:24
CPC Classifications
H; H03; H03L; H03L1/00; H03L1/02; H03L1/028; G; G04; G04B; G04B17/00; G04B17/20; G04B17/22; G04C; G04C11/00; G04C11/08; G04C11/081; G04C11/084
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
A method of temperature compensating an oscillation circuit including an oscillator for a timepiece comprising continually switching impedance coupled to said oscillator between two levels, a frequency determining the ratio of the dwelling times at said levels being a function of ambient temperature, whereby the variation in the oscillation frequency of said oscillation circuit with said temperature is compensated for on an average.
Claim 2
Independent Claim
63 words
A method of temperature compensating an oscillation circuit including an oscillator for a timepiece comprising continually switching impedance coupled to said oscillator between two levels, a frequency determining the ratio of the dwelling times at said levels being a function of ambient temperature, whereby the variation in the oscillation frequency of said oscillation circuit with said temperature is compensated for on an average.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein said oscillator is a crystal oscillator and said impedance is capacitance.
Claim 4
Dependent Claim
14 words
A method according to claim 1, wherein said oscillator is a tuning fork oscillator.
Claim 5
Dependent Claim
66 words
An oscillation circuit for a timepiece which is temperature compensated on an average, comprising an oscillator, frequency at least one determining impedance element coupled to said oscillator, and switching means including a temperature sensitive element for continually connecting and disconnecting oscillator, the time ratio between connecting and disconnecting said impedance element being varied as a function of temperature corresponding to the temperature characteristic of said oscillator.
Claim 6
Dependent Claim
66 words
An oscillation circuit for a timepiece which is temperature compensated on an average, comprising an oscillator, frequency at least one determining impedance element coupled to said oscillator, and switching means including a temperature sensitive element for continually connecting and disconnecting oscillator, the time ratio between connecting and disconnecting said impedance element being varied as a function of temperature corresponding to the temperature characteristic of said oscillator.
Claim 7
Dependent Claim
21 words
An oscillation circuit according to claim 4 wherein said oscillator is a crystal oscillator and said impedance element is a capacitor.
Claim 8
Dependent Claim
22 words
An oscillation circuit according to claim 4, wherein said oscillator is a tuning fork oscillator and said impedance element is a capacitor.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |