GB1323717A - Timing devices - Google Patents
Timing devicesInfo
- Publication number
- GB1323717A GB1323717A GB4678870A GB4678870A GB1323717A GB 1323717 A GB1323717 A GB 1323717A GB 4678870 A GB4678870 A GB 4678870A GB 4678870 A GB4678870 A GB 4678870A GB 1323717 A GB1323717 A GB 1323717A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplitude
- oscillation
- winding
- transistor
- voltage
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Control Of Stepping Motors (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
1323717 Electronic watches; controlling amplitude of mechanical oscillation JAEGER S A 1 Oct 1970 [2 Oct 1969 14 April 1970] 46788/70 Headings G3R and G3T In an electronic watch wherein a balance wheel oscillator is electro-magnetically maintained, the balance wheel comprises a pair of spaced discs 1, Fig. 1a, one disc carrying a pair of ferrite permanent magnets 2, 2'. The magnets co-operate with driving, control and regulating windings 3, 4, 5 respectively, co-axially disposed and fixed relative to the balance wheel as shown Fig. 1. The coils are connected in a drive circuit Fig. 4, in which a transistor 11 is switched ON by positive peaks of voltage induced in control winding 4 by movement of the magnets relative thereto, and passes current pulses to the drive winding 3. A cyclic voltage is induced in regulating winding 5 proportional to the amplitude of oscillation of the wheel and together with the induced voltage in winding 4 switches OFF a transistor 15 when the oscillation amplitude reaches a predetermined value, e.g. 220 degrees. This causes the mean voltage across a capacitor 13 and hence the bias of transistor 11 to vary in accordance with the amplitude of oscillation, the voltage increasing with decreased oscillation amplitude and vice versa. The result is that the greater the oscillation amplitude the smaller will be the drive current fed in each cycle to drive winding 3 and vice versa so that substantially constant amplitude is maintained. Alternative winding arrangements are described with reference to Figs. 5, 6, 7, 8 (not shown). In the arrangement Fig. 8 (not shown) for example the regulating winding 5 has a plurality of taps any one of which may be selected for connection to the base of transistor 15 thereby to determine the maximum amplitude of oscillation, e. g. in a range 200 degrees to 250 degrees. To reduce temperature dependent variations the magnets (ferrite) have negative temperature co-efficient and similar to that of the base/emitter junction of transistor 15 which is of silicon.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR6933575A FR2063923B1 (en) | 1969-10-02 | 1969-10-02 | |
FR7013352A FR2112009B1 (en) | 1970-04-14 | 1970-04-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1323717A true GB1323717A (en) | 1973-07-18 |
Family
ID=26215297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4678870A Expired GB1323717A (en) | 1969-10-02 | 1970-10-01 | Timing devices |
Country Status (3)
Country | Link |
---|---|
US (1) | US3673786A (en) |
DE (1) | DE2047869B2 (en) |
GB (1) | GB1323717A (en) |
-
1970
- 1970-09-29 DE DE2047869A patent/DE2047869B2/en not_active Withdrawn
- 1970-09-30 US US76708A patent/US3673786A/en not_active Expired - Lifetime
- 1970-10-01 GB GB4678870A patent/GB1323717A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3673786A (en) | 1972-07-04 |
DE2047869B2 (en) | 1973-01-04 |
DE2047869A1 (en) | 1972-03-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
414F | Notice of opposition given (sect. 14/1949) | ||
414B | Case decided by the comptroller ** grants allowed (sect. 14/1949) | ||
PS | Patent sealed [section 19, patents act 1949] | ||
PLNP | Patent lapsed through nonpayment of renewal fees |