US3486049A - Mechanical resonator - Google Patents

Mechanical resonator Download PDF

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Publication number
US3486049A
US3486049A US712509A US71250968A US3486049A US 3486049 A US3486049 A US 3486049A US 712509 A US712509 A US 712509A US 71250968 A US71250968 A US 71250968A US 3486049 A US3486049 A US 3486049A
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US
United States
Prior art keywords
resonator
masses
branches
oscillate
arms
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 - Lifetime
Application number
US712509A
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English (en)
Inventor
Max Hetzel
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.)
Centre Electronique Horloger SA
Original Assignee
Centre Electronique Horloger SA
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 Centre Electronique Horloger SA filed Critical Centre Electronique Horloger SA
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    • 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
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B17/00—Mechanisms for stabilising frequency
    • G04B17/20—Compensation of mechanisms for stabilising frequency
    • 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
    • G04C3/102—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 of the mechanical oscillator or of the coil

Definitions

  • resonators of this kind when they are used in time-pieces, have the disadvantage of being affected with an error, called position error, i.e. that the frequency of oscillation depends on the position of the resonator in relation to the direction of gravity.
  • position error i.e. that the frequency of oscillation depends on the position of the resonator in relation to the direction of gravity.
  • the purpose of the invention is to reduce, and even to suppress, the position error of the known resonators of the type considered.
  • the resonator according to the invention is characterized in that each of its branches comprises a flexible part in order to allow a displacement of these masses under the influence of gravity, along a direction having a component which is perpendicular to the direction of oscillation of the said masses, as a function of the position of the resonator inspace, in order to reduce the position error.
  • FIGURES 1, 2 and 3 of the appended drawing illustrate, by way of examples, a plan view of two embodiments and of a variant of the resonator according to the invention.
  • the resonator according to FIGURE 1 is formed by a metallic part comprising two branches, arcuate and symmetrical in this example, connetced by a middle part 3 by means of which the resonator is secured by screws on 'a support which may be the body of a watch.
  • a middle part 3 by means of which the resonator is secured by screws on 'a support which may be the body of a watch.
  • the holes provided for this purpose in the part 3.
  • the branches 1 and 2 are arranged to oscillate in phase opposition and each comprises, at their free ends, masses 5 and 6, respectively, belonging to an electro-magnetic transductor of a known type ensuring the maintenance of the vibrations of the resonator.
  • the coil of this transductor is not shown and it is well-known that it acts magnetically on the masses 5 and 6 in order to ensure, in conjunction with the elasticity of the branches 1 and 2, the periodic motion of the masses towards and away from one another.
  • the branches 1 and 2 oscillate owing to the flexion of the parts 9 and 10 of these branches adjacent 3 which are made thinner for this purpose.
  • the straight line 11 in dots and dashes illustrates the general direction of the oscillating motion of the masses 5 and 6 during the operation of the resonator.
  • each of the branches 1 and 2 comprises a flexible part, constituted in this example by thinned down parts 12 and 13, respectively, situated in the neighbourhood of the corresponding masses 5 and 6.
  • These flexible parts 12 and 13 are provided to allow a slight displacement of the masses 5 and 6 under the influence of gravity, according to a direction which, in the illustrated example, is practically perpendicular to the direction 11 of oscillation of these masses. Besides it is suflicient if the direction of this displacement has a component which is perpendicular to the line 11.
  • the masses 5 and 6 do not quite oscillate in the direction of the line 11, this being due to the presence of the flexible parts 12 and 13. These masses oscillate along a direction which is oblique in relation to 11 and inclined towards the foot 3.
  • the perturbating effect of this obliquity requires, in order that it may be compensated, the provision of a compensating mass distributed along the branches of the resonator, as may be seen in 14 and 1-5.
  • These distributed compensating masses oscillate in directions forming an angle in relation to 11, but on the side opposite to the foot 3, i.e. to the direction of oscillation of the masses 5 and 6.
  • the elastic parts 12 and 13 could obviously not be provided immediately adjacent the corresponding masses 5 and -6.
  • the resonator comprises two symmetrical oscillating arms 16 and 17, called principal arms, an intermediate securing foot 18, and at the free ends of the arms 16 and 17, two U-shaped auxiliary arms 19 and 20, arranged symmetrically, in a direction perpendicular to the principal axis of symmetry 21 of the resonator.
  • the auxiliary arms 19 and 20 are integral, by one of their ends with the terminal part of one of the principal arms 16 and 17. On their other extremity, which is free, is secured a mass 22, respectively 23.
  • the windings of the maintaining coils of the resonator, which act mag- 3 netically on the masses 22 and 23 are indicated schematically in 24 and 25.
  • the centers of gravity G and G of the oscillating masses are situated at least approximately on the median lines 28, respectively 29 of the principal arms 16 and 17.
  • the masses 22 and 23 are secured on one side (the side opposite the foot 18) of the auxiliary arms 19 and 20.
  • the construction is improved by disposing the masses 22a and 23a in a symmetrical manner on the end of the auxiliary arms 19a and 20a.
  • a mechanical resonator comprising two branches oscillating in phase opposition, said branches being connected together at one end and each having at its free end a mass belonging to a transductor maintaining the vibrations of the resonator, each of said branches comprising a resilient part allowing said masses to oscillate in the manner of unilaterally fixed prongs, and a flexible part in order to allow a displacement of these masses under the influence of gravity, along a direction having a component perpendicular to the direction of oscillation of said masses, said flexible part being dimensioned so as to reduce the position error with reference to a normal frequency of the oscillations.
  • each said branch comprises two flexible parts, one near the connection of said two branches, in order to ensure oscillation of said mass, and the other near said mass to allow the perpendicular displacement thereof.
  • each of said oscillating masses is substantially divided into two partial masses by said flexible part of each branch and wherein each branch is curved and has its masses so distributed that the centers of gravity of said partial masses have components of oscillating motion parallel to an axis of symmetry of the resonator, the component of each partial mass being opposite to the component of the other mass of one branch in order to compensate the dynamic forces created by each one of said components in one branch.
  • each branch is provided at its free end with an auxiliary resilient U-shaped arm, integral at one of its ends with the end of said branch, and bearing at its opposite free end one of the masses, said two auxiliary arms being arranged symmetrically in relation to the principal axis of symmetry of the resonator.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
US712509A 1967-03-31 1968-03-12 Mechanical resonator Expired - Lifetime US3486049A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH457567A CH469299A (fr) 1967-03-31 1967-03-31 Résonateur mécanique pour pièce d'horlogerie

Publications (1)

Publication Number Publication Date
US3486049A true US3486049A (en) 1969-12-23

Family

ID=4278644

Family Applications (1)

Application Number Title Priority Date Filing Date
US712509A Expired - Lifetime US3486049A (en) 1967-03-31 1968-03-12 Mechanical resonator

Country Status (9)

Country Link
US (1) US3486049A (ru)
AT (1) AT278665B (ru)
BE (1) BE711629A (ru)
CH (1) CH469299A (ru)
DE (1) DE1673635A1 (ru)
FR (1) FR1559271A (ru)
GB (1) GB1163706A (ru)
NL (1) NL6803274A (ru)
SE (1) SE345754B (ru)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649858A (en) * 1969-02-19 1972-03-14 Omega Brandt & Freres Sa Louis Transmission, particularly for use in a timepiece, for converting the oscillating movement of a tuning fork into a rotating movement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH713150A2 (fr) * 2016-11-23 2018-05-31 Eta Sa Mft Horlogere Suisse Mécanisme régulateur à résonateur rotatif à guidage flexible entretenu par un échappement libre à ancre.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170278A (en) * 1961-09-18 1965-02-23 Foerderung Forschung Gmbh Flexural vibrator for normal-frequency oscillators, especially in time-measuring appliances
US3269106A (en) * 1964-01-20 1966-08-30 Centre Electron Horloger Mechanical resonator for normal frequency oscillators in time-keepers
CA741517A (en) * 1966-08-30 Ishikawa Kazuo Added mass type circular tuning fork
US3283495A (en) * 1964-02-18 1966-11-08 Centre Electron Horloger Electronic watch
US3316708A (en) * 1964-07-31 1967-05-02 Ct Electronique Horloger Mechanical resonator for normal frequency oscillators in time measuring device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA741517A (en) * 1966-08-30 Ishikawa Kazuo Added mass type circular tuning fork
US3170278A (en) * 1961-09-18 1965-02-23 Foerderung Forschung Gmbh Flexural vibrator for normal-frequency oscillators, especially in time-measuring appliances
US3269106A (en) * 1964-01-20 1966-08-30 Centre Electron Horloger Mechanical resonator for normal frequency oscillators in time-keepers
US3283495A (en) * 1964-02-18 1966-11-08 Centre Electron Horloger Electronic watch
US3316708A (en) * 1964-07-31 1967-05-02 Ct Electronique Horloger Mechanical resonator for normal frequency oscillators in time measuring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649858A (en) * 1969-02-19 1972-03-14 Omega Brandt & Freres Sa Louis Transmission, particularly for use in a timepiece, for converting the oscillating movement of a tuning fork into a rotating movement

Also Published As

Publication number Publication date
NL6803274A (ru) 1968-10-01
SE345754B (ru) 1972-06-05
BE711629A (ru) 1968-09-04
CH469299A (fr) 1969-04-15
AT278665B (de) 1970-02-10
FR1559271A (ru) 1969-03-07
GB1163706A (en) 1969-09-10
DE1673635A1 (de) 1972-02-10

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