GB955559A - Improvements in or relating to electronically-controlled timepieces and tuning fork structures therefor - Google Patents

Improvements in or relating to electronically-controlled timepieces and tuning fork structures therefor

Info

Publication number
GB955559A
GB955559A GB3141761A GB3141761A GB955559A GB 955559 A GB955559 A GB 955559A GB 3141761 A GB3141761 A GB 3141761A GB 3141761 A GB3141761 A GB 3141761A GB 955559 A GB955559 A GB 955559A
Authority
GB
United Kingdom
Prior art keywords
coil
tines
drive
tuning fork
base
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
Application number
GB3141761A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bulova Watch Co Inc
Original Assignee
Bulova Watch Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bulova Watch Co Inc filed Critical Bulova Watch Co Inc
Publication of GB955559A publication Critical patent/GB955559A/en
Expired legal-status Critical Current

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
    • G04C3/101—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 constructional details
    • G04C3/107—Controlling frequency or amplitude of the oscillating system

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)

Abstract

955,559. Reciprocating motors. BULOVA WATCH CO. Inc. Aug. 31, 1961 [Jan. 19, 1961], No. 31417/61. Heading H2A. [Also in Divisions G3 and G5] A tuning fork structure, for an electronicallycontrolled time-piece comprises a pair of tines 15, 16 connected by a base 17 which has an integral mounting stem 18, the junction of the stem 18 and base 17 being constructed at 18a to provide a resilient spring mounting, the stem 18 extending upwardly from the base and being situated between the tines. Each tine carries a movable magnetic element of a transducer 21 comprising the magnetic element formed by a cylinder 21a having a permanent magnet rod 21b supported coaxially therein to define an air gap wherein a stationary coil is mounted, the rod and coil being correspondingly tapered to accommodate the greatest number of coil turns at a position of maximum flux density. An electronic drive circuit of the tuning fork comprises a transistor 39 of which the base electrode B is coupled through an R-C bias network 40-41 to one end of a phasesensing coil 23 associated with the transducer of one tine 15, the other end of this coil being connected to one end of a drive coil 22 in series with a drive coil 26 of the other transducer which is led to the collector electrode C of the transistor. The emitter electrode E goes to a battery 30 which connects with the junction of drive coil 22 and phase-sensing coil 23. The polarity shown is for a Germanium PNP type junction. A capacitor 42 across the phasesensing coil through battery 30 shorts out parasitic currents. In practice the back e.m.f. in the drive coils has a peak valve about 10% less than battery voltage so that the amplitude of the tines is controlled towards a desired value and within limits which normally do not affect the drive to a time train 12. The fork is tunable by a rotatably adjustable mass 31 carried with each magnet from the ends of the tines. As further disclosed, in a circular timepiece electric components are mounted in sub-assemblies on opposite sides of the tuning fork, the tines being bowed inwardly to allow room for assembly.
GB3141761A 1961-01-19 1961-08-31 Improvements in or relating to electronically-controlled timepieces and tuning fork structures therefor Expired GB955559A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8989661A 1961-01-19 1961-01-19

Publications (1)

Publication Number Publication Date
GB955559A true GB955559A (en) 1964-04-15

Family

ID=22220121

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3141761A Expired GB955559A (en) 1961-01-19 1961-08-31 Improvements in or relating to electronically-controlled timepieces and tuning fork structures therefor

Country Status (1)

Country Link
GB (1) GB955559A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220176A (en) * 1964-03-30 1965-11-30 Sunbeam Corp Fastening means for attachments to clock housings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220176A (en) * 1964-03-30 1965-11-30 Sunbeam Corp Fastening means for attachments to clock housings

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