US3794867A - Fixing device for an oscillatory crystal - Google Patents

Fixing device for an oscillatory crystal Download PDF

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Publication number
US3794867A
US3794867A US00224879A US3794867DA US3794867A US 3794867 A US3794867 A US 3794867A US 00224879 A US00224879 A US 00224879A US 3794867D A US3794867D A US 3794867DA US 3794867 A US3794867 A US 3794867A
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United States
Prior art keywords
faces
bar
crystal
points
fixing device
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Expired - Lifetime
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US00224879A
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English (en)
Inventor
G Gibert
P Vidal
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.)
Compagnie Electronique et de Piezoelectricite CEPE
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Compagnie Electronique et de Piezoelectricite CEPE
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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

  • ABSTRACT A wire suspension device for oscillatory piezoelectric crystals made of a bar vibrating in a flexion mode, said wires being fixed on two parallel faces at points of minimum vibration of the crystal determined by the intersection with these faces of a particular inclined straight line passing through a point of the median axis of longitudinal symmetry located at a distance from one end of approximately 0.2 times the total length.
  • the present invention relates to oscillatory crystals for time-base purposes, these conventionally being electrically sustained by 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 cryatal lattice.
  • the present invention relates to a fixing device for crystal mounting which does not exhibit this drawback and more precisely to a fixing device for a crystalline parallelepiped bar capable of mechanical oscillations in a flexion mode and in a plane parallel to that of the faces by which said parallelepiped is fixed, said fixing faces being parallel with one another, comprising a fixed support, and suspension wires, respectively attached at one of their ends to said support and at the other end to the crystal, at fixing points on said faces, said points being arranged in pairs respectively on each of said faces, and each pair of points being located on a straight line intersecting the median plane of symmetry of the bar which is parallel to said faces, said intersection point being located on the axis of symmetry of said median plane of the bar, and said straight line making an angle ranging between and with the direction perpendicularto said faces.
  • FIG. 1 illustrates a crystal fixing device, of prior art design
  • FIG. 2 illustrates a fixing device in accordance with the invention
  • FIG. 3 illustrates a diagram
  • FIG. 4 illustrates a variant embodiment of the device in accordance with the invention.
  • FIG. 1 illustrates an oscillatory bar equipped with fixing points chosen in accordance with the prior art.
  • the bar is cut in the form of a rectangular parallelepiped from a quartz crystal, the corners of said parallelepiped being orientated in particular directions associated with the crystal lattice, in order to achieve characteristics of oscillation which accord with the applications envisaged.
  • the crystallographic axes X, Y and Z being respectively the electrical axis, the mechanical axis and the optical axis
  • the fixing points A A A and A are, as has already been indicated, arranged upon the axis of symmetry of each of the two fixing faces at a distance from the ends equivalent to 0.224 times the bar length, and constitute the points of attachment for suspension wires such as those 4 and 5 which are attached on the other hand to a fixed support 10 which has not been shown in full.
  • FIG. 2 illustrates a suspension device in accordance with the invention. It comprises suspension wires such as 4 and 5, attached on the one hand to a fixed support (not shown) and on the other to the crystal bar by means of fixings, in the form of solder for example, produced at the points A,, A A and A located at particular positions on the fixing faces. These positions can be defined by the intersections between a particular straight line D and the planes of the fixing faces:
  • the straight line D is contained in the plane of symmetry 6 of the bar, which is parallel to the axis Z and makes an angle alpha in relation to the perpendicular to the fixing faces 11 and 12, as well as in relation to the plane of symmetry 7 of the bar, which is parallel to the plane X Y.
  • the value of a depends upon the ratio of the thickness 15 to the width 16 of the bar, said angle a being measured in the reverse sense, that is to say in the clockwise sense.
  • the straight line D intersects said plane of symmetry 7 of the bar which is parallel to the plane X Y, at a point B which, in relation to the end thereof, is at a distance of less than 0.224 times the bar length, and may be as little as 0.2 times the bar length.
  • FIG. 3 illustrates a diagram showing the order of magnitude of the above-defined angle alpha as a function of the dimensions of the bar, and in fact of the ratio R between the thickness 15 and width 16 thereof.
  • F l6. 4 illustrates a variant embodiment of the fixing device in accordance with the invention.
  • FIG. 2 It comprises the same suspension elements as the device of FIG. 2 but the fixing points have been placed at locations A' and A' located on special straight lines G and G on the fixing faces, which lines pass through the points A, A A A already defined, and are inclined in relation to the axis of symmetry of each fixing face, at an angle beta ranging between 30 and 60 the fixing points are on the other hand, as FIG. 2 already indicates, respectively located at the points of intersection between a straight line D passing through the point B and said straight lines G and G this putting said points at either side of that plane of symmetry of the bar which is parallel to the plan Y Z, and making it possible to arbitrarily choose as fixing points any point located on these straight lines.
  • the results obtained with crystal bars comprising the fixing device in accordance with the invention include, when compared with identical bars fitted with the device of the prior art type, a Zero temperature coefficient in a bar raised from 28 to 49, and a time-based frequency shift of the bar which is around times less.
  • a fixing device for an oscillatory crystal in parallelpiped bar form capable of mechanical oscillations in a flexion mode and in a plane parallel to that of the faces by which said parallelpiped is fixed, said fixing faces being parallel with one'another, comprising a fixed support, and suspension wires respectively attached at one of their ends to said support and at the other end of the crystal, at fixing points on said faces, said points being arranged in pairs respectively on each of said faces, and each pair of points being located on a straight line intersecting the median plane of symmetry of the bar which is parallel to said faces, said intersection point being located on the axis of symmetry of said median plane, said straight line making an acute angle upto 20 with a line passing at said intersection point and perpendicular to said faces.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US00224879A 1971-02-19 1972-02-09 Fixing device for an oscillatory crystal Expired - Lifetime US3794867A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7105751A FR2125759A5 (enrdf_load_stackoverflow) 1971-02-19 1971-02-19

Publications (1)

Publication Number Publication Date
US3794867A true US3794867A (en) 1974-02-26

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Application Number Title Priority Date Filing Date
US00224879A Expired - Lifetime US3794867A (en) 1971-02-19 1972-02-09 Fixing device for an oscillatory crystal

Country Status (7)

Country Link
US (1) US3794867A (enrdf_load_stackoverflow)
JP (1) JPS5616563B1 (enrdf_load_stackoverflow)
CH (1) CH546020A (enrdf_load_stackoverflow)
DE (1) DE2207696A1 (enrdf_load_stackoverflow)
FR (1) FR2125759A5 (enrdf_load_stackoverflow)
GB (1) GB1382168A (enrdf_load_stackoverflow)
IT (1) IT947688B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089092A (en) * 1975-05-19 1978-05-16 Societe Suisse pour l'Industrie Horrlogere (SSIH) Management Services S.A. Method of suspending electrical components
US4139793A (en) * 1976-09-14 1979-02-13 Ebauches S.A. Integral resonant support arms for piezoelectric microresonators

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60105542U (ja) * 1983-12-26 1985-07-18 日産ディーゼル工業株式会社 車両用ドアミラ−装置
JPS60110046U (ja) * 1983-12-29 1985-07-26 いすゞ自動車株式会社 自動車用ドアミラ−

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282369A (en) * 1940-08-03 1942-05-12 Bell Telephone Labor Inc Piezoelectric crystal apparatus
US2395434A (en) * 1943-08-11 1946-02-26 Tenenbaum Berko Piezoelectric crystals
US2410825A (en) * 1943-03-04 1946-11-12 Bell Telephone Labor Inc Piezoelectric crystal apparatus
US3221189A (en) * 1963-06-03 1965-11-30 Dynamics Corp America Ceramic ruggedized low frequency crystal unit
US3581126A (en) * 1969-01-13 1971-05-25 Centre Electron Horloger Mounting device for flexion vibrators

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282369A (en) * 1940-08-03 1942-05-12 Bell Telephone Labor Inc Piezoelectric crystal apparatus
US2410825A (en) * 1943-03-04 1946-11-12 Bell Telephone Labor Inc Piezoelectric crystal apparatus
US2395434A (en) * 1943-08-11 1946-02-26 Tenenbaum Berko Piezoelectric crystals
US3221189A (en) * 1963-06-03 1965-11-30 Dynamics Corp America Ceramic ruggedized low frequency crystal unit
US3581126A (en) * 1969-01-13 1971-05-25 Centre Electron Horloger Mounting device for flexion vibrators

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089092A (en) * 1975-05-19 1978-05-16 Societe Suisse pour l'Industrie Horrlogere (SSIH) Management Services S.A. Method of suspending electrical components
US4139793A (en) * 1976-09-14 1979-02-13 Ebauches S.A. Integral resonant support arms for piezoelectric microresonators

Also Published As

Publication number Publication date
GB1382168A (en) 1975-01-29
DE2207696A1 (de) 1972-08-31
IT947688B (it) 1973-05-30
JPS5616563B1 (enrdf_load_stackoverflow) 1981-04-17
FR2125759A5 (enrdf_load_stackoverflow) 1972-09-29
CH546020A (enrdf_load_stackoverflow) 1974-02-15

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