US3515914A - Mechanical oscillator including a torsion bar - Google Patents

Mechanical oscillator including a torsion bar Download PDF

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Publication number
US3515914A
US3515914A US649892A US3515914DA US3515914A US 3515914 A US3515914 A US 3515914A US 649892 A US649892 A US 649892A US 3515914D A US3515914D A US 3515914DA US 3515914 A US3515914 A US 3515914A
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Prior art keywords
oscillator
transducers
mechanical
torsion bar
masses
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Expired - Lifetime
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US649892A
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English (en)
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Samuel Steinemann
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Institut Straumann AG
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Institut Straumann AG
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • 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
    • G04B17/04—Oscillators acting by spring tension
    • G04B17/10—Oscillators with torsion strips or springs acting in the same manner as torsion strips, e.g. weight oscillating in a horizontal plane
    • 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
    • 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
    • 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
    • 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
    • G04C3/12—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 piezoelectric means; driven by magneto-strictive means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/24—Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive

Definitions

  • a mechanical oscillator includes a torsion bar provided at both ends with inertia masses, the torsion bar being mounted at the location of the node of oscillatory movement.
  • the oscillator has a generally H-shaped configuration, With the web or cross bar portion of the H- shaped configuration comprising the torsion bar and the legs of the H-shaped configuration constituting the inertia masses. Additional masses may be disposed at the four ends of the arms or legs of the H-shaped configuration, and at least one of these masses, or more than one of the masses, form part of an electro-mechanical transducer.
  • Various forms of mechanical oscillators are known, including particularly tuning forks and so-called flexion vibrators.
  • Known types of mechanical oscillators are characterized by losses and frequency shifts, and by disturbances due to mechanical stresses and the like. They are also characterized by a limited number of modes of oscillation, as well as by radiation or loss of energy through mounting means.
  • prior known mechanical oscillators are operationally affected by thermally induced expansion and contraction, and physical damping mechanisms limit the range of usable frequencies.
  • the natural frequency of known mechanical oscillators is dependent upon the position or orientation thereof, due to the effects of gravity.
  • a mechanical oscillator including a torsion bar provided at both ends with inertia masses.
  • the moments of inertia of the two masses, when taken about the longitudinal axis of the torsion bar, are substantially equal to each other, and the center of each mass lies on the axis of the torsion bar.
  • the torsion bar is mounted at the position of the node of its oscillatory movement so that, in use, oscillations on one side of the node are transmitted to the other side and both sides oscillate oppositely and substantially equally.
  • the masses of the oscillator may be so distributed that the center of'gravity of the oscillator coincides with the node of its oscillatory movement.
  • the oscillator preferably has a substantially H-shaped configuration, with the web portion of the configuration comprising the torsion bar.
  • a fastening member may be provided at the center of the web, and extend perpendicularly to the Web.
  • Masses may be disposable at the four ends of the arms or legs of the H-shaped configuration, and preferably at least one mass forms part of an electro-mechanical transducer.
  • the oscillator may include at least three transducers, at least two of which serve for detecting movement and for compensating disturbing oscillations.
  • a plurality of transducers may be provided, with the transducers being coupled together through an Patented June 2, 1970 electric switch circuit.
  • a plurality of transducers may be provided with the transducers being directly connected to each other.
  • a coil of one transducer may be also served as a coil for a second transducer.
  • One or several of the mentioned legs or masses may comprise the pawls of a stepping mechanism, and the mechanical oscillator in accordance with the invention may form part of a time piece or of an electric filter.
  • An object of the present invention is to provide an improved mechanical oscillator.
  • Another object of the invention is to provide a mechanical oscillator comprising a torsion bar provided at both ends with inertia masses.
  • a further object of the invention is to provide such a mechanical oscillator in which the moments of inertia of the two masses, taken about the longitudinal axis of the torsion bar, are substantially equal to one another, with the center of each mass lying on the axis of the torsion bar.
  • Still another object of the invention is to provide such a mechanical oscillator in which the torsion bar is mounted at the position of the node of its oscillatory movement.
  • a further object of the invention is to provide an oscillator of the type just mentioned in which the center of gravity of the oscillator coincides with the node of oscillatory movement.
  • Yet another object of the invention is to provide such an oscillator in a substantially H-shaped configuration in which the web portion comprises the torsion bar.
  • a further object of the invention is to provide such an H-shaped configuration for a mechanical oscillator in which a fastening member is provided at the center of the web and extends perpendicularly to the latter.
  • Still another object of the invention is to provide such an H-shaped configuration mechanical oscillator having masses disposable at the four ends of the arms of the H-shaped configuration and at least one mass forming part of an electro-mechanical transducer.
  • FIG. 1 is a perspective view of one form of oscillator embodying the invention
  • FIG. 2 illustrates the various natural vibrations of the oscillator shown in FIG. 1;
  • FIGS. 3 and 4 are sectional views illustrating electrodynamic transducers embodying the oscillator shown in FIG. 1;
  • FIG. 5 is a view similar to FIGS. 3 and 4 illustrating an electro magnetic transducer embodying the oscillator shown in FIG. 1;
  • FIG. 6 is a partial perspective view illustrating an electro-static transducer embodying the oscillator shown in FIG. 1;
  • FIG. 7 is a perspective view illustrating another form of oscillator embodying the invention.
  • FIGS. 8 through 14 somewhat diagrammatically illustrate various couplings of the transducers through electric circuits and through the polarization of electro-mechanical transducers and FIGS. 15-17 illustrate the use of the inventive oscillator in conjunction with a filter, a stepping mechanism and a time-piece.
  • the mechanical oscillator therein illustrated has substantially the form of the letter H.
  • Web 1 of the H-shaped configuration forms the torsion bar, while the two arms or legs 2 and 3, at opposite ends of this bar or web, form the inertia masses.
  • Mass 2 carries, at each of its opposite ends, magnets 4, and mass 3 carries, at each of its opposite ends, magnets 5.
  • the magnets may have any shape and, in the arrangement shown in FIG. 1, also serve as weighting masses. Other shapes or configurations of the magnets as shown in FIGS. 3 and 4.
  • Two mutually symmetrical fastening lugs 6 and 7 are provided to extend perpendicularly from the center of web 1 in opposite directions therefrom, lugs 6 and 7 having respective apertures 6a and 7a at their free ends. Lugs 6 and 7 serve for mounting of the oscillator.
  • the moments of inertia of the two masses are equal to one another and that the center ofeach of the two inertia masses (which is designated as the integral ⁇ r dm.) lies on the axis of web 1.
  • the entire H-shaped configuration is of symmetrical construction, the masses are so distributed that the center of gravity of the entire oscillator coincides with the node of movement, which is at the center of torsion bar 1. Since the oscillator illustrated in FIG. 1 does not contain only an elastic member and inertia masses distributed discretely, by which the frequency of resonance would be accurately predetermined, it can perform the most diverse oscillations.
  • the oscillator has a high quality factor and good stability, which is due to the fact that the mechanical stressing is distributed and the macroscopic thermoelastic damping is absent, because no dilatations occur in a torsion bar.
  • the invention oscillator has a natural frequency which is independent of position due to the fact that its mounting point coincides with its geometrical center and, at the same ime, forms the center of gravity and the center of inertia. Thus the contribution of the gravity field to the potential energy is cancelled out.
  • a torsion oscillator is not anisochronous through the geometry of the movement. That is, to say, its frequency is independent of amplitude.
  • excitation may be effected magnetically, electrodynamically, or electrostatically, and either at one end only of one of the two beams 2 or 3 are else at a plurality of these ends. If more than one transducer is used, it is possible not only to suppress all undesired oscillations through the arrangement of electrical switching circuits, but also to make the entire oscillator insensitive to blows, the arrangement being such that the tensions induced by the blows are ineffective.
  • FIG. 3 illustrates an electrodynamic transducer in which a pot magnet 11 is mounted on the free end of an arm 10 of the oscillator, this pot magnet 11 oscillating in the field of a stationary coil 12.
  • FIG. 4 illustrates a somewhat different form of construction of an electrodynamic transducer, in which the pot magnet 13 is uniformly cylindrical, as contrasted to the frusto-conical shape of the pot magnet 11, with the coil 14 cooperating with the pot magnet 13.
  • FIG. 5 illustrates an electrostatic transducer in which the two stationary electrodes are shown at 19 and 20.
  • the embodiment of the mechanical oscillator shown in FIG. 7 differs somewhat from the embodiment thereof shown in FIG. 1, although the oscillator of FIG. 7 has an H-shaped configuration including a web or cross bar forming the torsion bar 21 and a pair of arms or legs 22 and 23 disposed at the ends of torsion bar 21. Arms 22 and 23 act as inertia masses inthe same manner as described for the embodiment of the oscillator shown in FIG. 1.
  • the oscillator shown in FIG. 7 has only a single fastening lug or mounting member 24 extending from the center of torsion bar 21 and perpendicular to the torsion bar. This mounting arrangement provides an elasticity of the suspension adapted to correspond to any external disturbances which may occur.
  • fastening lug 24 must be sufiiciently elastic that, although it can be used to mount the oscillator, the oscillations of one half of torsion bar 21 are transmitted to the other half and the two ends of the torsion bar oscillate equally and oppositely.
  • the torsion bar is a single oscillator with a node of oscillation situated at its center. Completely rigid securing of the oscillator torsion bar would transform the single torsion bar into two torsion bars which are independent with respect to their oscillations being, in effect, clamped at one end.
  • the subsidary oscillations caused by the torsion and bending of the mounting means still occur.
  • the natural frequency of these ocillations caused by such torsion and bending amount to about 0.3 to 1.2 times the main frequency.
  • the subsidiary oscillations had a frequency of 850 c./s. for a natural main oscillation of 998 c./s., or about 9.84 times the frequency of the main oscillation.
  • FIG. 8 illustrates a simple resonator or filter in which excitation of an oscillator 29, as well as decrease of the oscillation thereof, is effected by means of a single transducer 28.
  • FIG. 9 illustrates a simple feed back resonator utilizing the invention oscillator and including two transducers 29 and 30 in circuit connection with an amplifier 31.
  • FIGS. 10 and 11 illustrate phase-sentive systems each including three transducers 32, 33 and 34 and an amplifier 31', in FIG. 10 and 31" of differential type, in FIG. 11.
  • the transducers by means of the circuitry or of the polarization thereof, utilize the phase of the induced voltage.
  • Two transducers 32 and 33 are used for the detection of oscillation and the third transducer 34 is exciting the oscillation. Since the sum of signals of the two oscillation detection transducers 32 and 33 are not disturbed by blows which provoke other movements than the normal oscillation, high insensitivity to external disturbance can be obtained and the oscillation is rigidly held.
  • transducers 32 and 33 are connected in parallel to a single input to amplifier 31' where as in FIG. 11, transducers 32 and 33 are connected to separate inputs to diflerential amplifier 31".
  • FIGS. 12 and 13 illustrate further developed phasesensitive systems.
  • four transducers 35 are associated with the mechanical oscillator and connected with an amplifier 37. Each transducer is connected to a separate input or output of the dilferential amplifier 37, the phase of the input and output being such that only the fundamental oscillation is excited and the external disturbances do not induce excitation.
  • four transducers 36 are associated with an amplifier 38, with two of the transducers being connected in parallel to a single input of amplifier 38 and two others of the transducers being connected in parallel to a single output of amplifier 38, the phase relationships for the transducers being correct only for normal oscillation.
  • FIG. 14 illustrates an electro-mechanical filter including four transducers 39 associated with the mechanical oscillator, the transducers at corresponding ends of the two arms of the H-shaped configuration being connected in parallel with each other.
  • Other combinations are also possible, such as the connection of a plurality of transducers in series or transportation of the positions of the transducers.
  • FIG. 15 the use of the inventive oscillator in conjunction with a filter is diagrammatically shown.
  • Z is a [filter section with the particular impedance behavior of a resonating element, with its transducers.
  • the configuration of the resonating element and the transducers corresponds to that of FIGS. 9-14.
  • Reference numeral 40 indicates the resonator with transducers and mounting.
  • Pawl 41 is coupled with the oscillator.
  • Reference numeral 42 indicates a fixed pawl, the ratchet wheel being shown at 43.
  • oscillator 44 is coupled with the mechanical time indicator 45 and the electronic time indicator 46.
  • Oscillators embodying the invention are thus suitable not only for controlling an electrical oscillation, for example for keeping it constant, but also are suitable for direct mechanical supply of power, for example for driving a ratchet wheel in a manner similar to that already known and using tuning fork oscillations.
  • a mechanical oscillator comprising a one-piece H- shape substantially flat metal member including a pair of substantially parallel legs integrally interconnected, at substantialy their mid points, by a cross web; said legs acting as polar inertia moments for said web, and said web serving as a torsion rod; means supporting said torsion bar web at the position therealong of the node of this oscillatory movement whereby, during oscillation of said oscillator, oscillations on one side of the node are transmitted to the other side of the node so that both sides oscillate oppositely and substantially equally; additional masses at the four ends of the legs of said H-shape flat metal member; the distribution of the masses of said mechanical oscillator being such that the center of gravity of the oscillator coincides with said node of oscillatory movement; at least three of said additional masses each comprising a part of a respective electrical-mechanical transducer; at least two of said electrical-mechanical transducers operating together as oscillation detectors and being connected with each other in a manner such that their signals add for
  • a mechanical oscillator as claimed in claim 1, including oscillator electronic circuitry coupling said transducers and eifective to cancel disturbing oscillations.
  • a mechanical oscillator as claimed in claim 1, including electrical circuitry directly interconnecting said transducers and effective to cancel disturbing oscillations.
  • a mechanical oscillator as claimed in claim 1, including an oscillation detector winding common to two of said transducers.
  • a mechanical oscillator as claimed in claim 1, in which said common winding serves further for excitation of said oscillator.
  • a mechanical oscillator as claimed in claim 1, in which at least one of said legs includes a pawl forming part of a stepping mechanism.
  • a mechanical oscillator as claimed in claim 1, including a time piece, said mechanical oscillator constituting a component of said time piece.
  • a mechanical oscillator as claimed in claim 1, including an electric filter, said mechanical oscillator constituting a component of said electric filter.
  • a mechanical oscillator as claimed in claim 1, in which at least one of said additional masses includes a magnet.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
US649892A 1966-09-26 1967-06-29 Mechanical oscillator including a torsion bar Expired - Lifetime US3515914A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1385466A CH481412A (de) 1966-09-26 1966-09-26 Schwinger für Zeitmessgeräte

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US3515914A true US3515914A (en) 1970-06-02

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US (1) US3515914A (de)
CH (2) CH481412A (de)
DE (2) DE1673758B2 (de)
FR (1) FR1605076A (de)
GB (1) GB1175550A (de)
NL (1) NL6709050A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3675055A (en) * 1971-03-15 1972-07-04 C Hunter Mcshan Motor incorporating torsional mode resonator
JPS4833860A (de) * 1971-09-02 1973-05-14
US3917966A (en) * 1969-01-23 1975-11-04 Hattori Tokeiten Kk Vibrator
EP1450477A1 (de) * 2002-03-01 2004-08-25 Seiko Epson Corporation Piezoelektrisches betätigungsglied und uhr und tragbare einheit mit piezoelektrischem betätigungsglied
US20070205690A1 (en) * 2006-03-03 2007-09-06 Industrial Technology Research Institute Composite mode transducer and cooling device having the composite mode transducer
US20150212490A1 (en) * 2012-09-03 2015-07-30 Blancpain S.A. Timepiece regulating member
US20160070235A1 (en) * 2013-08-05 2016-03-10 The Swatch Group Research And Development Ltd. Regulating system for a mechanical watch
CN106662839A (zh) * 2015-02-03 2017-05-10 Eta瑞士钟表制造股份有限公司 等时钟表谐振器

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CH797368A4 (de) * 1968-05-29 1970-04-15
US3534468A (en) * 1968-08-05 1970-10-20 Motorola Inc Method of making an electromechanical frequency responsive device with armature supported on torsion band
JPS4725077U (de) * 1971-04-12 1972-11-21
NL174609C (nl) * 1975-10-15 1984-07-02 Philips Nv Volgspiegelinrichting in een optische platenspeler.
CH702188B1 (fr) 2009-11-02 2017-12-29 Lvmh Swiss Mft Sa Organe réglant pour montre bracelet, et pièce d'horlogerie comportant un tel organe réglant.
CH702187A2 (fr) 2009-11-02 2011-05-13 Lvmh Swiss Mft Sa Organe réglant pour montre bracelet, et pièce d'horlogerie comportant un tel organe réglant.
EP3206091B1 (de) * 2015-02-03 2019-01-23 ETA SA Manufacture Horlogère Suisse Isochroner resonator für eine uhr
JP6843191B2 (ja) * 2018-07-24 2021-03-17 ザ・スウォッチ・グループ・リサーチ・アンド・ディベロップメント・リミテッド 長い角ストロークを有するフレクシャーベアリングを備えた計時器用発振器

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US2594749A (en) * 1944-12-13 1952-04-29 Patelhold Patentverwertung Mechanical vibration system
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US2959746A (en) * 1958-03-28 1960-11-08 James G Sears Tuning fork frequency standard having a blocking coil in energizing circuit
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US3149274A (en) * 1962-01-17 1964-09-15 Bulova Watch Co Inc Electromagnetic vibrating drive
US3150337A (en) * 1961-02-27 1964-09-22 Armec Corp Electro-mechanical resonant device
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US3201932A (en) * 1964-07-10 1965-08-24 United States Time Corp Vibratory frequency standard for a timekeeping device
CA726856A (en) * 1966-02-01 Waldburger Heinz Mechanical resonator for normal frequency oscillators in time-keepers
US3242445A (en) * 1964-03-31 1966-03-22 Toko Radio Coil Kenkyusho Kk Supporting device for mechanical filter
US3277394A (en) * 1963-03-12 1966-10-04 United States Time Corp Temperature compensated electromechanical resonator
US3281725A (en) * 1961-09-28 1966-10-25 Siemens Ag Filter for electrical waves using plural resonators having similar dominant responseand different spurious response
US3308313A (en) * 1966-01-11 1967-03-07 Movado Montres Torsion oscillator
US3316708A (en) * 1964-07-31 1967-05-02 Ct Electronique Horloger Mechanical resonator for normal frequency oscillators in time measuring device
US3351788A (en) * 1966-02-01 1967-11-07 Movado Montres Apparatus for mechanically converting the oscillating movement of an electro-mechanical oscillator
GB1130012A (en) * 1965-02-12 1968-10-09 Citizen Watch Co Ltd Mechanical vibrator for timepiece

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CA726856A (en) * 1966-02-01 Waldburger Heinz Mechanical resonator for normal frequency oscillators in time-keepers
US2594749A (en) * 1944-12-13 1952-04-29 Patelhold Patentverwertung Mechanical vibration system
US2730665A (en) * 1951-09-27 1956-01-10 Robert W Hart Signal detector
US2861256A (en) * 1956-04-16 1958-11-18 Robert W Hart Integrating signal detector employing a resonant mechanical system
US2959746A (en) * 1958-03-28 1960-11-08 James G Sears Tuning fork frequency standard having a blocking coil in energizing circuit
US3080538A (en) * 1959-02-19 1963-03-05 Collins Radio Co Center clamped torsional resonator having bearing supported ends
US3150337A (en) * 1961-02-27 1964-09-22 Armec Corp Electro-mechanical resonant device
NL283314A (de) * 1961-09-18
US3281725A (en) * 1961-09-28 1966-10-25 Siemens Ag Filter for electrical waves using plural resonators having similar dominant responseand different spurious response
US3192488A (en) * 1961-10-10 1965-06-29 Winston O Faith Multiphase electromechanical oscillator
US3149274A (en) * 1962-01-17 1964-09-15 Bulova Watch Co Inc Electromagnetic vibrating drive
US3277394A (en) * 1963-03-12 1966-10-04 United States Time Corp Temperature compensated electromechanical resonator
US3242445A (en) * 1964-03-31 1966-03-22 Toko Radio Coil Kenkyusho Kk Supporting device for mechanical filter
US3201932A (en) * 1964-07-10 1965-08-24 United States Time Corp Vibratory frequency standard for a timekeeping device
US3316708A (en) * 1964-07-31 1967-05-02 Ct Electronique Horloger Mechanical resonator for normal frequency oscillators in time measuring device
GB1130012A (en) * 1965-02-12 1968-10-09 Citizen Watch Co Ltd Mechanical vibrator for timepiece
US3308313A (en) * 1966-01-11 1967-03-07 Movado Montres Torsion oscillator
US3351788A (en) * 1966-02-01 1967-11-07 Movado Montres Apparatus for mechanically converting the oscillating movement of an electro-mechanical oscillator

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3917966A (en) * 1969-01-23 1975-11-04 Hattori Tokeiten Kk Vibrator
US3675055A (en) * 1971-03-15 1972-07-04 C Hunter Mcshan Motor incorporating torsional mode resonator
JPS4833860A (de) * 1971-09-02 1973-05-14
EP1450477A1 (de) * 2002-03-01 2004-08-25 Seiko Epson Corporation Piezoelektrisches betätigungsglied und uhr und tragbare einheit mit piezoelektrischem betätigungsglied
EP1450477A4 (de) * 2002-03-01 2006-08-30 Seiko Epson Corp Piezoelektrisches betätigungsglied und uhr und tragbare einheit mit piezoelektrischem betätigungsglied
US7683522B2 (en) * 2006-03-03 2010-03-23 Industrial Technology Research Institute Composite mode transducer and cooling device having the composite mode transducer
US20080135213A1 (en) * 2006-03-03 2008-06-12 Syh-Yuh Cheng Composite mode transducer and cooling device having the composite mode transducer
US7567015B2 (en) * 2006-03-03 2009-07-28 Industrial Technology Research Institute Composite mode transducer and cooling device having the composite mode transducer
US20070205690A1 (en) * 2006-03-03 2007-09-06 Industrial Technology Research Institute Composite mode transducer and cooling device having the composite mode transducer
US20150212490A1 (en) * 2012-09-03 2015-07-30 Blancpain S.A. Timepiece regulating member
US9201399B2 (en) * 2012-09-03 2015-12-01 Blancpain S.A. Timepiece regulating member
US20160070235A1 (en) * 2013-08-05 2016-03-10 The Swatch Group Research And Development Ltd. Regulating system for a mechanical watch
US10222757B2 (en) * 2013-08-05 2019-03-05 The Swatch Group Research And Development Ltd Regulating system for a mechanical watch
CN106662839A (zh) * 2015-02-03 2017-05-10 Eta瑞士钟表制造股份有限公司 等时钟表谐振器
JP2017514152A (ja) * 2015-02-03 2017-06-01 ウーテーアー・エス・アー・マニファクチュール・オロロジェール・スイス 等時性を有する計時器用共振器
US9983549B2 (en) 2015-02-03 2018-05-29 Eta Sa Manufacture Horlogere Suisse Isochronous timepiece resonator
CN106662839B (zh) * 2015-02-03 2019-03-29 Eta瑞士钟表制造股份有限公司 等时钟表谐振器

Also Published As

Publication number Publication date
DE1673758B2 (de) 1976-08-26
FR1605076A (de) 1973-01-12
DE1972490U (de) 1967-11-09
CH481412A (de) 1969-07-31
NL6709050A (de) 1968-03-27
GB1175550A (en) 1969-12-23
DE1673758A1 (de) 1971-02-25
CH1385466A4 (de) 1969-07-31

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