US3906249A - Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations - Google Patents

Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations Download PDF

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Publication number
US3906249A
US3906249A US361513A US36151373A US3906249A US 3906249 A US3906249 A US 3906249A US 361513 A US361513 A US 361513A US 36151373 A US36151373 A US 36151373A US 3906249 A US3906249 A US 3906249A
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United States
Prior art keywords
wires
fixing
crystal
fixing device
attached
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Expired - Lifetime
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US361513A
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English (en)
Inventor
Guy Gibert
Pierre Vidal
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Individual
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Individual
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Filing date
Publication date
Priority to FR7106695A priority Critical patent/FR2127184A5/fr
Priority to CH153872A priority patent/CH551704A/fr
Priority to DE19722209033 priority patent/DE2209033A1/de
Priority to GB891772A priority patent/GB1376671A/en
Application filed by Individual filed Critical Individual
Priority to US361513A priority patent/US3906249A/en
Application granted granted Critical
Publication of US3906249A publication Critical patent/US3906249A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/05—Holders or supports
    • H03H9/0504—Holders or supports for bulk acoustic wave devices
    • H03H9/0533—Holders or supports for bulk acoustic wave devices consisting of wire

Definitions

  • the present invention relates to oscillatory crystals for time-base purposes, these conventionally being electrically sustained by the piezoelectric effect through suitably disposed electrodes, and the material of which they are made being usually constituted by a quartz crystal cut in particular directions which are associated with its crystal lattice.
  • the crystal elements used take the form of elongated bars whose section is near-square, and which are equipped with electrodes whose shape and disposition are such that the resultant vibrations involve a bending or flexion motion of the whole bar.
  • the present invention relates to a suspension device which does not exhibit this drawback and more particularly to a fixing device for a crystalline bar of parallelepiped form which is capable of mechanical oscillations in a flexion mode and in a plane parallel to that of the fixing faces of said parallelepiped, said bar comprising a fixed support, and suspension wires respectively attached by one of the ends thereof to said support and at their other end to the crystal, at points of minimum vibration on the fixing faces thereof, said other end of each of said wires being fixed to said faces by a part of the lateral surface of the wire.
  • FIG. 1 illustrates a suspension device of prior art design
  • FIG. 2 illustrates a suspension device in accordance with the invention
  • FIGS. 3, 4 and 5 illustrates various embodiments of the invention.
  • FIG. 1 illustrates a suspension device in accordance with the prior art, applied to a crystal bar operating in the flexion mode.
  • the device comprises a fixed support 1 to which there are attached suspension wires 2 whose ends terminate, at the surface of the crystal bar 3,at nodal points, or points of minimum vibration as defined hereinbefore, namely 4, 5, 6 and 7.
  • d is the free length of the suspension wire
  • V is the velocity propagation of the oscillation along the wire
  • k is the wavelength of propagation of the oscillation.
  • the length d of the suspension wire should be short and this means that, for a given frequency f determined by each particular application, a velocity of propagation V has to be sought which is likewise low.
  • the torsional mode of vibration described hereinbefore for a suspension of the prior art, as illustrated in FIG. I corresponds to the contrary to a high velocity propagation through the wire, and does not enable efficient control of the reflection conditions at its ends to be achieved.
  • FIG. 2 illustrates a first embodiment of the device, in accordance with the invention where, for the sake of clarity, and this applying to the following figures as well, only the top part of the device has been shown.
  • the suspension wire is attached to the crystal by the provision of a fold 12 of its end, defining a segment 30 parallel to the fixing face, the one extremity 31 of this segment being fixed at points of minimum vibration of the fixing face.
  • this segment 30 thus constituted by a part of the wire itself, acts as an oscillating lever, convetting the conventional torsional oscillation of the wire into a flexion oscillation, the wire considered about its mean position 2, occupying extreme positions 19 and 20; this flexion mode corresponds to a very much lower velocity propagation, this being a factor the need for and advantages of which have been discussed hereinbefore.
  • a characteristic of the invention is that the lateral part of the wire acting as a conversion lever must be freeof any fixating or anchoring material such as a solder, except at its very extremity 31 which is fixed to the crystal.
  • the free portion of the lever must have a length greater than the two diameters of the wire suspension.
  • FIG. 3 illustrates a variant embodiment of the invention which lies on a geometric characteristic of the oscillating of the crystal, namely, the existence of nodal verter lever.
  • the operation is the same as that of the device shown in FIG. 2, but the amplitudes of oscillation are reduced, and consequently the crystal has improved mechanical isolation.
  • FIG. 4 illustrates another simplified variant embodiment of the invention,'in which the free part of the suspension is contained in a plane parallel to that of the face of the crystal to which it is attached by the lever 24.
  • the operation is the same as that of the devices of FIGS. 2 and 3 although there is an improvement in the conversion of one mode of oscillation to the other, because of the simplification of the mechanical structure, albeit at the expense of a greater longitudinal dimension.
  • FIG. 5 illustrates a variant embodiment of the device shown in FIG. 4, in which the free part of the suspension has been given a rectangular section, the shorter side being attached to the crystal and the longer side being perpendicular to the fixing face of the crystal.
  • the invention has been applied to crystal oscillators operating at low frequencies in the order of a few kilohertz, and has shown a major improvement in the quality factor of the crystal, e.g., on the order of a ratio of 2, and, compared with the case of crystals suspended by the conventional method, a substantial reduction in the time-based frequency drift normally brought about due to slow modifications in the mode of suspension.
  • a fixing device for an oscillatory crystal bar of parallelepiped form capable of mechanical oscillations in a flexion mode in a plane parallel to that of the fixing faces of said parallelepiped
  • mounting means for converting torsional vibrations to flexional vibrations said device comprising a fixed support, and a plurality of suspension wires each being attached at one end thereof to said support, and at the other end thereof being formed into a lever aligned parallel to sid flexion plane, the extremity of said lever portion of each of said wires being fixed on its lateral surface to the fixing faces at points of minimum vibration wherein the portion of each of said suspension wires between said one end and said other end having a length equal to a quarter of the wavelength of propagation of flexional oscillations in said suspension wires, the frequency of said flexion oscillations being equal to the frequency of said mechanical oscillations of said crystal bar.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US361513A 1971-02-26 1973-05-18 Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations Expired - Lifetime US3906249A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FR7106695A FR2127184A5 (enrdf_load_stackoverflow) 1971-02-26 1971-02-26
CH153872A CH551704A (fr) 1971-02-26 1972-02-02 Dispositif de fixation pour cristal oscillant
DE19722209033 DE2209033A1 (de) 1971-02-26 1972-02-25 Befestigungsvorrichtung fur einen Kn Stallstab, insbesondere fur Oszillatoren
GB891772A GB1376671A (en) 1971-02-26 1972-02-25 Fixing device for oscillatory crystals and oscillatory crystal equipped with such a device
US361513A US3906249A (en) 1971-02-26 1973-05-18 Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR7106695A FR2127184A5 (enrdf_load_stackoverflow) 1971-02-26 1971-02-26
US22360472A 1972-02-04 1972-02-04
US361513A US3906249A (en) 1971-02-26 1973-05-18 Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations

Publications (1)

Publication Number Publication Date
US3906249A true US3906249A (en) 1975-09-16

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ID=27249506

Family Applications (1)

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US361513A Expired - Lifetime US3906249A (en) 1971-02-26 1973-05-18 Mounting device for oscillatory crystal which converts torsional vibrations to flexural vibrations

Country Status (5)

Country Link
US (1) US3906249A (enrdf_load_stackoverflow)
CH (1) CH551704A (enrdf_load_stackoverflow)
DE (1) DE2209033A1 (enrdf_load_stackoverflow)
FR (1) FR2127184A5 (enrdf_load_stackoverflow)
GB (1) GB1376671A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027181A (en) * 1974-08-20 1977-05-31 Societe Suisse Pour L'industrie Horlogere (Ssih) Management Services S.A. Housing and support for piezo-electric resonator
FR2363825A1 (fr) * 1976-09-07 1978-03-31 Seikosha Kk Oscillateur a quartz, et procede pour sa fabrication
US5264753A (en) * 1990-12-25 1993-11-23 Canon Kabushiki Kaisha Supporting device for vibration wave driven motor
US5521457A (en) * 1993-05-28 1996-05-28 Matsushita Electric Industrial Co., Ltd. Holding structure for a piezoelectric vibrator
US6720714B2 (en) * 1997-05-28 2004-04-13 Murata Manufacturing Co., Ltd. Vibrating gyroscope
US20040226978A1 (en) * 2003-05-12 2004-11-18 Ngk Insulators, Ltd. Structures for supporting vibrators
US6822375B2 (en) * 2000-02-23 2004-11-23 Murata Manufacturing Co., Ltd. Vibrating gyroscope and electronic device using the same having a driving circuit, a detection circuit and four supporting members with different rigidities, different shapes, different cross sections, different materials and different lengths

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410825A (en) * 1943-03-04 1946-11-12 Bell Telephone Labor Inc Piezoelectric crystal apparatus
US3566164A (en) * 1967-06-05 1971-02-23 Centre Electron Horloger System for resiliently supporting an oscillation quartz in a casing
US3581126A (en) * 1969-01-13 1971-05-25 Centre Electron Horloger Mounting device for flexion vibrators
US3751692A (en) * 1970-11-23 1973-08-07 Centre Electron Horloger Temperature insensitive piezoelectric resonator mounting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2410825A (en) * 1943-03-04 1946-11-12 Bell Telephone Labor Inc Piezoelectric crystal apparatus
US3566164A (en) * 1967-06-05 1971-02-23 Centre Electron Horloger System for resiliently supporting an oscillation quartz in a casing
US3581126A (en) * 1969-01-13 1971-05-25 Centre Electron Horloger Mounting device for flexion vibrators
US3751692A (en) * 1970-11-23 1973-08-07 Centre Electron Horloger Temperature insensitive piezoelectric resonator mounting

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027181A (en) * 1974-08-20 1977-05-31 Societe Suisse Pour L'industrie Horlogere (Ssih) Management Services S.A. Housing and support for piezo-electric resonator
FR2363825A1 (fr) * 1976-09-07 1978-03-31 Seikosha Kk Oscillateur a quartz, et procede pour sa fabrication
US5264753A (en) * 1990-12-25 1993-11-23 Canon Kabushiki Kaisha Supporting device for vibration wave driven motor
US5521457A (en) * 1993-05-28 1996-05-28 Matsushita Electric Industrial Co., Ltd. Holding structure for a piezoelectric vibrator
US6720714B2 (en) * 1997-05-28 2004-04-13 Murata Manufacturing Co., Ltd. Vibrating gyroscope
US6822375B2 (en) * 2000-02-23 2004-11-23 Murata Manufacturing Co., Ltd. Vibrating gyroscope and electronic device using the same having a driving circuit, a detection circuit and four supporting members with different rigidities, different shapes, different cross sections, different materials and different lengths
US20040226978A1 (en) * 2003-05-12 2004-11-18 Ngk Insulators, Ltd. Structures for supporting vibrators
US7148609B2 (en) * 2003-05-12 2006-12-12 Ngk Insulators, Ltd. Structures for supporting vibrators

Also Published As

Publication number Publication date
CH551704A (fr) 1974-07-15
DE2209033A1 (de) 1972-09-07
GB1376671A (en) 1974-12-11
FR2127184A5 (enrdf_load_stackoverflow) 1972-10-13

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