GB1146494A - Electronic timekeeper - Google Patents
Electronic timekeeperInfo
- Publication number
- GB1146494A GB1146494A GB2337866A GB2337866A GB1146494A GB 1146494 A GB1146494 A GB 1146494A GB 2337866 A GB2337866 A GB 2337866A GB 2337866 A GB2337866 A GB 2337866A GB 1146494 A GB1146494 A GB 1146494A
- Authority
- GB
- United Kingdom
- Prior art keywords
- balance wheel
- multivibrator
- circuit
- coil
- pulse width
- 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
- G04C3/04—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 balance
- G04C3/06—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 balance using electromagnetic coupling between electric power source and balance
- G04C3/065—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 balance using electromagnetic coupling between electric power source and balance the balance controlling gear-train by means of static switches, e.g. transistor circuits
- G04C3/069—Driving circuits using a single coil for detection and driving purposes
Abstract
1,146,494. Transistor oscillator circuits. S. KAKUBARI. 25 May, 1966 [25 May, 1965; 26 June, 1965], No. 23378/66. Heading H3T. [Also in Division G3] A free-running multivibrator circuit for maintaining the oscillations of the balance wheel of an electronic time piece (see Division G3) comprises R.C. coupled transistors V 1 , V 2 . The circuit supplies pulses to a fixed coil 21 mounted between permanent magnets (15, 16) attached to the balance wheel. These pulses magnetize the upper and lower surfaces of the coil which therefore deflects the balance wheel. The movement of the magnets induces pulses in the coil which trigger the transistor V 2 to synchronize the oscillations of the balance wheel and multivibrator. The values T 1 (equal to R 1 ,C 1 ) and T 2 (equal to R 2 C 2 ) are selected so that T 1 <<T 2 and the period T f (equal to T 1 + T 2 ) of the multivibrator is selected approximately equal to half the vibration period Tm of the balance wheel. Starting of the balance wheel oscillation is assisted by initially increasing the width of the output pulse of the multivibrator and this may be achieved by a push-button switch SW connecting the resistors R 1 <SP>1</SP>, R 2 <SP>1</SP> or R 1 , R 2 in circuit, R 1 <SP>1</SP> being greater than R 1 to provide the necessary initial increase in the pulse width. The pulse width in the steady state operation of the balance wheel is narrower and this narrowing may be achieved automatically by modifications of the circuit to include diodes. The time constant of the multivibrator is initially large since it includes the internal resistance of the diodes but as the amplitude of the triggering pulse from the coil 21 increases, the internal resistance of the diodes decreases, thereby reducing the time constant and the pulse width. Modifications are described of the circuit for automatically reducing the pulse width whilst a further multivibrator circuit, Fig. 12, incorporating a third transistor of NPN type is also described. Reference has been directed by the Comptroller to Specifications 921,948 and 926,419.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3039865 | 1965-05-25 | ||
| JP3788065 | 1965-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1146494A true GB1146494A (en) | 1969-03-26 |
Family
ID=26368729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2337866A Expired GB1146494A (en) | 1965-05-25 | 1966-05-25 | Electronic timekeeper |
Country Status (3)
| Country | Link |
|---|---|
| CH (2) | CH551652A (en) |
| DE (1) | DE1523968B2 (en) |
| GB (1) | GB1146494A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3667210A (en) * | 1970-07-06 | 1972-06-06 | Timex Corp | Horological instrument |
| US4825332A (en) * | 1987-02-20 | 1989-04-25 | Hiroshi Aoki | Electromagnetic driving circuit |
-
1966
- 1966-05-24 DE DE19661523968 patent/DE1523968B2/en active Pending
- 1966-05-25 GB GB2337866A patent/GB1146494A/en not_active Expired
- 1966-05-25 CH CH758066A patent/CH551652A/de unknown
- 1966-05-25 CH CH758066D patent/CH758066A4/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH758066A4 (en) | 1969-06-30 |
| DE1523968B2 (en) | 1973-01-04 |
| DE1523968A1 (en) | 1970-04-09 |
| CH551652A (en) | 1974-07-15 |
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