GB1337704A - Time-piece - Google Patents
Time-pieceInfo
- Publication number
- GB1337704A GB1337704A GB257872A GB257872A GB1337704A GB 1337704 A GB1337704 A GB 1337704A GB 257872 A GB257872 A GB 257872A GB 257872 A GB257872 A GB 257872A GB 1337704 A GB1337704 A GB 1337704A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tuning fork
- condenser
- transistor
- fork
- driving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
- G04C3/10—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
- G04C3/108—Driving circuits
-
- G—PHYSICS
- G04—HOROLOGY
- G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
- G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
- G04C3/10—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by electromagnetic means
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
- Electromechanical Clocks (AREA)
Abstract
1337704 Electric timepieces SUWA SEIKOSHA K K 19 Jan 1972 [12 Feb 1971] 2578/72 Heading G3T A timepiece having a tuning fork whose oscillations provide a time standard and are converted into rotary movement of a gear train, for example, by a ratchet wheel and pawl (9, 10), Fig. 1. (not shown), is provided with a driving circuit including at least a P-N-P transistor 15 and an N-P-N transistor 16 whose collectors are connected respectively to the ends of a two-terminal coil 19 for driving the tuning fork. The circuit which includes resistors 18, 21 and a condenser 17, is stated to be selfoscillating even when the tuning fork is stationary, and if its frequency is substantially the same as the natural frequency of the fork the latter is easily stimulated. A condenser 20 bypasses unwanted harmonics.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP557771 | 1971-02-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1337704A true GB1337704A (en) | 1973-11-21 |
Family
ID=11615064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB257872A Expired GB1337704A (en) | 1971-02-12 | 1972-01-19 | Time-piece |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3780520A (en) |
| DE (1) | DE2206965A1 (en) |
| GB (1) | GB1337704A (en) |
-
1972
- 1972-01-19 GB GB257872A patent/GB1337704A/en not_active Expired
- 1972-02-02 US US00222956A patent/US3780520A/en not_active Expired - Lifetime
- 1972-02-14 DE DE19722206965 patent/DE2206965A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US3780520A (en) | 1973-12-25 |
| DE2206965A1 (en) | 1972-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 414F | Notice of opposition given (sect. 14/1949) | ||
| 414A | Case decided by the comptroller ** specification amended (sect. 14/1949) | ||
| SPA | Amended specification published | ||
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |