US1844705A - Piezo-electric apparatus - Google Patents

Piezo-electric apparatus Download PDF

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Publication number
US1844705A
US1844705A US274347A US27434728A US1844705A US 1844705 A US1844705 A US 1844705A US 274347 A US274347 A US 274347A US 27434728 A US27434728 A US 27434728A US 1844705 A US1844705 A US 1844705A
Authority
US
United States
Prior art keywords
piezo
electrode
floating electrode
adjusting member
electric apparatus
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
US274347A
Other languages
English (en)
Inventor
Augustus B Tripp
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US274347A priority Critical patent/US1844705A/en
Priority to FR36844D priority patent/FR36844E/fr
Application granted granted Critical
Publication of US1844705A publication Critical patent/US1844705A/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

  • My invention relates to piezo-electric apparatus, and has for its principal object the provision of an improved piezo-electric cell which is so constructed as to permit ready assembly and accurate adjustment of its various parts.
  • a piezo-electric element such as a crystal of quartz or the like, will oscillate at a frequency dependent on its mechanical dimensions when it is subjected to an electrostatic field and that this characteristic of the piezo-electric element may be utilized to predetermine very accurately the frequency at which current is supplied from a source to an output circuit.
  • the electrodes through which the electro-static field is applied to the active surfaces of the element be capable of accurate adjustment with respect to one another. In making this adjustment, the element may be subjected to a compressive force applied through the electrodes or may rest upon one of the electrodes and be slightly spaced from the other.
  • the drawing illustrates a piezo-electric ap paratus constructed in accordance with my invention.
  • This apparatus includes a piezoelectric element 1 which is interposed between an adjustable electrode 2 and a floating electrode 8. This element is surrounded at its outer edges by an insulation collar 4, and is protected from variations in temperature by an insulation cover 5 mounted on an insula- 18%8. Setialflo. 274,3".
  • tion base 6 Potential is applied to the adjustable electrode 2 through a terminal 8 and a threaded support 9 and to the floating electrode 3 through a terminal 7, a threaded pedestal 10, an adjusting member '11 threaded into the pedestal 10 and a bolt 12 or a spiral spring 13 which surrounds the bolt 12 and is interposed between the adjusting member 11 and the electrode 3. 7
  • the adjustable mechanical coupling between the electrodes 2 and 3 includes the member 9, the base 6, the pcdestal lO, the adjusting member 11, the bolt 12 and the spring 13.
  • the floating electrode 3, the spring 13, the bolt 1:? and the threaded plug or adjusting member 11 are arranged to form a unit assembly which may be adjusted readily to apply any desired pressure to the active surfaces of the element 1.
  • the proper adjust- 5 meat of the electrode 2 is preferably made by first screwing it down until the floating electrode 3 is clamped against the top of the pedestal 10 by pressure exerted through the element 1 and then unscrewing the electrode i 2 slightly so as to free the floating electrode 3 and leave it pressed against the element 1 by a pressure dependent on the adjustment of the unit assembly formed by the members 3, 11, 12 and 13.
  • the maintenance of the electrodes in contact with the active surfaces of the piezo-electric element has the advantage that change in output due to temperature variations is largely avoided. This advantage is most marked in the case of very thin elements.
  • the floating electrode 3 and the element 1 are prevented from lateral displacement by the insulation barrier 4 which closely fits the upper periphery of the pedestal 10 and keeps the element 1 between the electrodes 2 and 3. It has been found that a piezoelectric cell of this construction can be roughly treated without damage and can be satisfactorily used in any desired position.
  • a unit assembly including a floating electrode, an adjusting member, a member fixed to said hand this 28th floating electrode and extending through said adjusting member, and a spiral spring interposed between said adjusting member and said floating electrode.
  • a unit assembly includi'ng a floating electrode, an adjusting member, a pin fixed to said electrode and extending through said adjusting member, and a spiral spring surrounding said pin and extending between said floating electrode and said adjusting member.
  • a unit assembly including a floating electrode, an adjustable electrode spaced from said floating electrode for forming a crystal chamber, a spring arranged to support said floating electrode and means comprising a pair of threaded members for ad- 7 justing the position of said spring.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
US274347A 1928-05-01 1928-05-01 Piezo-electric apparatus Expired - Lifetime US1844705A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US274347A US1844705A (en) 1928-05-01 1928-05-01 Piezo-electric apparatus
FR36844D FR36844E (fr) 1928-05-01 1929-04-27 Perfectionnements aux appareils piezoélectriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US274347A US1844705A (en) 1928-05-01 1928-05-01 Piezo-electric apparatus

Publications (1)

Publication Number Publication Date
US1844705A true US1844705A (en) 1932-02-09

Family

ID=23047805

Family Applications (1)

Application Number Title Priority Date Filing Date
US274347A Expired - Lifetime US1844705A (en) 1928-05-01 1928-05-01 Piezo-electric apparatus

Country Status (2)

Country Link
US (1) US1844705A (fr)
FR (1) FR36844E (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431233A (en) * 1944-04-21 1947-11-18 Gen Motors Corp Supersonic measuring means
US2454769A (en) * 1942-01-23 1948-11-30 Int Standard Electric Corp Piezoelectric crystal support
US2457563A (en) * 1944-04-10 1948-12-28 Dan W Keller Crystal mounting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454769A (en) * 1942-01-23 1948-11-30 Int Standard Electric Corp Piezoelectric crystal support
US2457563A (en) * 1944-04-10 1948-12-28 Dan W Keller Crystal mounting
US2431233A (en) * 1944-04-21 1947-11-18 Gen Motors Corp Supersonic measuring means

Also Published As

Publication number Publication date
FR36844E (fr) 1930-09-20

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