US1883111A - Piezo-electric crystal mounting - Google Patents

Piezo-electric crystal mounting Download PDF

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Publication number
US1883111A
US1883111A US385904A US38590429A US1883111A US 1883111 A US1883111 A US 1883111A US 385904 A US385904 A US 385904A US 38590429 A US38590429 A US 38590429A US 1883111 A US1883111 A US 1883111A
Authority
US
United States
Prior art keywords
plate
crystal
electrode
electrodes
clamping
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
US385904A
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English (en)
Inventor
George M Thurston
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories 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 Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US385904A priority Critical patent/US1883111A/en
Priority to GB18706/30A priority patent/GB357233A/en
Priority to DE1930546762D priority patent/DE546762C/de
Priority to FR700574D priority patent/FR700574A/fr
Application granted granted Critical
Publication of US1883111A publication Critical patent/US1883111A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H03H9/09—Elastic or damping supports

Definitions

  • This invention relates to the mounting of piezo-electric crystal bodies. 5
  • This invention aims to provide a simple, rugged, easily portable, physically stable, 5' mounting for crystal bodies. Since frequency stability is concomitant with physical stability it isa subsidiary object of the invention to provide a mounting for crystal bodies characterized by comparatively great frequency stability under conditions where relative movement of the crystal and its immediately associated structure would tend to promote frequency instability.
  • the frequency bodies is, in addition to other things, a function of the coupling between the vibrating body and the electric circuit.
  • This coupling in turn is a function of the mounting of the crystal body, that is, its position with respect to the electrodes by which connection to the electric circuit is obtained,
  • Fig. 1 represents in plan a crystal plate mounting of the invention, of the specific form in which the plate is circular and 1s clamped at the periphery, the holder being to expose the interior
  • Figs. 3 and 4 are plan and elevation views, partly broken away, of an alternative type of crystal plate-mountingin which a v rectangular plate is clamped at opposite ed es. Iteferring to Figs.
  • the metalbase plate 1 and cover portion 2 of insulating material are rigidly secured together by screw 'fastening'means 3 to provide a protective housing for the circulatory cut piezoelectric crystal plate which is stimulated into vibration, as in accordance with now well knownprinciples, by electrodes positioned at opposite faces so as to impose an electrostatic stress thereon.
  • the electrodes in the specific form of the device here illustrated are constituted by the-base plate 1, on the one hand, and by the plate 5 on the other hand. These electrode members are of course of conductive material.
  • the base electrode may be connected to the circuit with which the crystal plate is associated by a conductor not shown;
  • the upper plate 5 may be connected to such circuit through spring retainer member 6' and its screw fastening means represented generally by. reference 7.
  • the cover element 2 is constituted by a material known as Isolantite.
  • the lining member 8 may be used for the purpose of insuring a close fit be tween the electrode plate 5 and the cover member. If the cover member were constituted by a material subject to working to make it easily conform to specified size andshape this lining member could be dispensed I with. Inthe practical case it is constituted by a fiber bushing turned down on the inside to make an accurate fit with the electrode. It should be noted that the two electrodes engage the crystal plate only at the periphery thereof since they are dished in the center so as to leave a relatively narrow and short ri-m. Furthermore, the crystal plate is rigidly clamped between these electrodes at this portion, the dimensions and restoring force 1,ses,111
  • the upper electrode 5 is pressed on tothe crystal plate, which abuts the lower electrode, with considerable-fore- It has been found that if the clamping is made sufficiently rigid to insure an absolute absence of relative movement of the crystal plate and its immediately associated structure under the stress of operation or ,of transportation and handling, the frequency, willremain stable and the rigid clamping will not be attended by excessive damping, that is, loss of activity of the crystal plate. Still further the actual clamping of the crystal re-.'
  • Slight adjustment of the frequency may be made bychanges in the clamping pressure and/or by shortening of the clamping rim of either electrode so as to change the spacing between the recessed portion of the electrode and the opposed crystal surface.
  • the narrownessflof the rim is not critical although for best operation the rims shouldclamp the crystal plate over as small an area a's'possiblewithout danger of crushing the edge of the plate. In 'the practical case above noted it was approximately one'millimeter wide. 4
  • Figs. 3 and 4 represent, considerably. more diagrammatically than in the instance of the modificatitin in Figs;1 and 2, anadaptation of the, generic principle of' the invention to the case of a clamped rectangular crystal plate.
  • the crystal plates are clamped at the parallel edges normal to the optical axis. This is achieved by providing each of the electrodes 1 and 5 with salient portions which correspond to the peripheral clamping rim of the structure of Figs. 1 and 2.
  • the salient portions on each electrode project from one face of the electrode so-that in the assemblage they project inwardly toward the opposite electrode. These projecting portions are spaced apart on each electrode a distance substantially equal to but slightly less than the dimension of the crystal plate in the direction of its optical axis.
  • the crystal'plate holder assembly may be the same as is illustrated in Figs. 1 and 2 although, for simplicity, slight differences are to" be noted in the illustration.
  • the identifications of the crystalplate and electrodes, the elements which illustrate the principles of the invention, are the same as those used in these figures. In view of the above pointed out situation no further ex planation of this modification is required.
  • a crystal plate having circular electrode faces
  • a holder therefor comprising a conductive base portion functloning as one electrode'and a cover member of insulating material, an electrode within said holder engaging the plate oppositely to the base portion of the holder, and means between said electrode and the inside top of said cover member cooperating with said base portion to substantially immovably clamp said plate between said electrode and said base portion, said electrode and base portion each having a raised rim-like portion adapted to engage said plate and clamp it at the periphery thereof.
  • a piezo-electric crystal body having opposite faces, electrodes therefor and means including said electrodes for clamping said body to said electrodes along the entire margin of said faces and only at the marginal portions of said faces.
  • a flat plate of quartz having the planes of its flat faces parallel to the optical axis of the quartz, two similarly shaped electrode plates between which said quartz plate is positioned, at least one of said plates having portions projecting from a face extending toward the face of the adjacent plate and means clamping said plates tightly and holding them rigidly positioned along said projecting portions whereby the remainders of the ad acent faces are held out of contact with each other.
  • a plate of quartz cut with its face planes parallel to the optical axis of the quartz similarly shaped flat electrodes adapted to be superposed each on one face of said quartz plate, means engaging opposite marginal portions of said quartz plate to' maintain said plate spaced from the flat electrodes over the principal portion of its area, and means clamping the superposed plates along said opposite margins in a rigid assemblage.
  • a quartz plate the plane faces of which are parallel to the principal axis of the quartz, electrodes therefor, each of said electrodes having salient said salient portions being spaced a art a distance substantially equal to and s ightly less than the dimension of said plate'in the direction of its optical axis, and means for clamping said plate between said electrodes with the salient portions of said electrodes engaging said plate at margins of the plate which are substantially normal to the optical axis.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Measuring Fluid Pressure (AREA)
  • Multi-Conductor Connections (AREA)
US385904A 1929-08-14 1929-08-14 Piezo-electric crystal mounting Expired - Lifetime US1883111A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US385904A US1883111A (en) 1929-08-14 1929-08-14 Piezo-electric crystal mounting
GB18706/30A GB357233A (en) 1929-08-14 1930-06-19 Piezo-electric crystal mounting
DE1930546762D DE546762C (de) 1929-08-14 1930-06-28 Befestigung fuer piezoelektrische Kristallplatten
FR700574D FR700574A (fr) 1929-08-14 1930-07-29 Dispositif de montage pour cristaux piezo-électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US385904A US1883111A (en) 1929-08-14 1929-08-14 Piezo-electric crystal mounting

Publications (1)

Publication Number Publication Date
US1883111A true US1883111A (en) 1932-10-18

Family

ID=23523353

Family Applications (1)

Application Number Title Priority Date Filing Date
US385904A Expired - Lifetime US1883111A (en) 1929-08-14 1929-08-14 Piezo-electric crystal mounting

Country Status (4)

Country Link
US (1) US1883111A (fr)
DE (1) DE546762C (fr)
FR (1) FR700574A (fr)
GB (1) GB357233A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757570C (de) * 1937-04-15 1953-09-14 Siemens & Halske A G Halterung fuer Schwingkristalle

Also Published As

Publication number Publication date
DE546762C (de) 1932-03-17
FR700574A (fr) 1931-03-04
GB357233A (en) 1931-09-21

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