US3978650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric timepiece
Assignee: Citizen Watch Co Ltd
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Filing: 1974-10-23
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Granted: 1976-09-07
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Expires: 1994-10-23
Abstract
Abstract An electronic timepiece which includes a time reference signal generator, which generates a signal which is used to count time, and is compensated in its frequency in order to have the predetermined frequency value regardless of variations in ambient temperature.
Inventors
- 👤 Yukio Hashimoto
- 👤 Shigeru Morokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:37
CPC Classifications
G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; H; H03; H03L; H03L1/00; H03L1/02; H03L1/022; H03L1/026; H03L1/027; H03L1/028
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
203 words
An electronic timepiece which is provided with a time reference signal having an output signal time count unit signal generator, a time counting mechanism and a time display mechanism; the electronic timepiece further comprising: a temperature signal generator for generating a temperature signal, said generator including an oscillator circuit having an output different from that of said time reference signal generator, wherein the ratio of output oscillation frequencies changes with temperature variation; means for transmitting said temperature signal intermittently; memory means for storing the temperature signal generated by said temperature generator until a subsequent temperature signal is generated and for delivering said stored temperature signal when the subsequent temperature signal is received by the memory; a signal converter for generating a temperature compensating signal, wherein said compensating signal compensates for the variations of the output frequency of said time reference signal generator caused by temperature variations; and a time reference signal frequency variable controller for synthesizing the output signal of said time reference signal generator and that of said signal converter by compensating for the changes of the output frequency of said time reference signal generator caused by the temperature variations and for delivering a resultant signal to said time unit signal generator.
Claim 2
Dependent Claim
203 words
An electronic timepiece which is provided with a time reference signal having an output signal time count unit signal generator, a time counting mechanism and a time display mechanism; the electronic timepiece further comprising: a temperature signal generator for generating a temperature signal, said generator including an oscillator circuit having an output different from that of said time reference signal generator, wherein the ratio of output oscillation frequencies changes with temperature variation; means for transmitting said temperature signal intermittently; memory means for storing the temperature signal generated by said temperature generator until a subsequent temperature signal is generated and for delivering said stored temperature signal when the subsequent temperature signal is received by the memory; a signal converter for generating a temperature compensating signal, wherein said compensating signal compensates for the variations of the output frequency of said time reference signal generator caused by temperature variations; and a time reference signal frequency variable controller for synthesizing the output signal of said time reference signal generator and that of said signal converter by compensating for the changes of the output frequency of said time reference signal generator caused by the temperature variations and for delivering a resultant signal to said time unit signal generator.
Claim 3
Dependent Claim
27 words
The electronic timepiece of claim 1, wherein said temperature signal generator is timed to oscillate intermittently by the output signal of said time count unit signal generator.
Claim 4
Dependent Claim
42 words
The electronic timepiece of claim 1, wherein said temperature signal generator is timed to oscillate intermittently by the output signal from a timing control mechanism, which is driven by inputs from the time count unit signal generator and the time counting mechanism.
Claim 5
Dependent Claim
43 words
The electronic timepiece of claim 1, wherein said time reference signal generator and said temperature signal generator are crystal oscillators including crystal vibrator elements, which differ from each other in frequency output caused by the temperature variations, which results in changing frequency ratios.
Claim 6
Dependent Claim
38 words
The electronic timepiece of claim 4, wherein the vibrator elements of said crystal oscillator used as the time reference signal generator and of said crystal oscillator used as said temperature signal generator are enclosed in a common casing.
Claim 7
Dependent Claim
50 words
The electronic timepiece of claim 1, wherein frequencies of two modes of oscillation are derived from a single reference vibrator element; one of the frequencies being used as a reference vibrator element of said time reference signal generator and the other as the reference vibrator of said temperature signal generator.
Claim 8
Dependent Claim
24 words
The electronic timepiece of claim 1, wherein said temperature compensating signal generator includes EXCLUSIVE-OR gate which intermittently enables said time count unit signal generator.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |