US2395841A - Piezoelectric crystal holder - Google Patents

Piezoelectric crystal holder Download PDF

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Publication number
US2395841A
US2395841A US513140A US51314043A US2395841A US 2395841 A US2395841 A US 2395841A US 513140 A US513140 A US 513140A US 51314043 A US51314043 A US 51314043A US 2395841 A US2395841 A US 2395841A
Authority
US
United States
Prior art keywords
crystal
contact
electrode
electrodes
engagement
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
US513140A
Other languages
English (en)
Inventor
Bokovoy Samuel Alexander
Garrison Kenton Kitch
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE461049D priority Critical patent/BE461049A/xx
Priority to NL64827D priority patent/NL64827C/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US513140A priority patent/US2395841A/en
Priority to GB24403/44A priority patent/GB584088A/en
Priority to FR913019D priority patent/FR913019A/fr
Application granted granted Critical
Publication of US2395841A publication Critical patent/US2395841A/en
Priority to CH260420D priority patent/CH260420A/de
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 in general to oscillator or resonator units for crystal controlled oscillator circuits and the like and consists of an improved formation of crystal element and coacting holder therefor designed to offer material advantages in its use.
  • a special object of the present improvements is to provide a simple and economically made unit assembly having an improved supporting arrangement for the crystal element and of a character which in operation will restrain or damp the vibration of the crystal element to a minimum or negligible degree.
  • the improved .resonator unit consists of a substantially rectangular crystal element of special formation having its opposite ends of tapered or blunt chisel formation immediately at the end portions thereof adapted to be supported in an.
  • the improved holder is preferably formed to provide a rectangular closed chamber for the crystal element, disposed in an oblique position therein, and is provided with an improved arrangement for making electrical contact with the opposite metalized or electrode surfaces of the crystal at one end thereof only and in a manner to effect an improved resilient pressure wiping contact with the electrode crystal surfaces.
  • the improved arrangement accordingly provides a desirable type of contact fo efficient electrical connection with the crystal element having a desirable range of self adjustment to accommodate variations in production tolerances.
  • the pressure contact is confined to the extremity of the crystal at one end portion only and in a manner which will reduce to the minimum damping.
  • the present improvements further include special features contributing to simplicity of design and for maintaining all the parts in their properly assembled relation so as to be securely positioned without danger of dislodgement such as to interfere with proper operation and which may occur from external shocks under conditions of use.
  • the improved assembly further is of a design which will readily accommodate crystal of different thickness and dimensions such as to permit a desirable range of adjustment of oscillation values to meet varied circuit conditions or requirements.
  • Fig. 1 is a view in side elevation having a portion of the holder member broken away and showing a desirable embodiment of the features of the invention.
  • Fig. 2 is a similar view having the lower portion thereof shown in vertical section centrally through the socket portion.
  • Fig. 3 is a horizontal sectional view taken on line 3-3 of Fig. 1.
  • the crystal resonator unit is illustrated as of the plug in type comprising a holder or container of insulating material consisting of a rectangular body portion l formed with an integral finger grip extension 2. a rectangular recess or opening 3 and having apertures 4-4 for the reception'of the terminal pins 55' for plug electrical connection.
  • the rectangular recess 3, provided for the reception and support of the crystal element, is a shown open at the front face of the holding body member and is closed as a sealed chamber after assembling of the parts by means of a complemental face plate 6, secured by screws ll passed through the body and threaded to the plate and with a sealing washer 8 interposed between the body and plate as shown.
  • the crystal oscillator or resonator element is of elongated rectangular plate form, formed of quartz crystal having its opposite or plane surfaces coated with the usual metallic electrodes ill, such as silver.
  • the marginal edged portions of the crystal at the ends are s Shown inclined or tapered to be of blunt chisel-like formation.
  • the electrode coatings may desirably be extended the full length of the crystal and over the beveled portions l2 but with suitable spacing at the ends thereof fo electrical separation.
  • Th crystal or resonator element is as shown positioned obliquely within the recess with one end thereof held or confined by the rectangular corner walls of the socket and the opposite end thereof is positioned to be engaged by the electrical contact elements in the improved arrangement as shown.
  • the improved form and structural arrangement of the contact elements are designed for effective cooperation with the special crystal form to effect good electrical contact with the electrodes at one of the beveled end surfaces only and with an angularity of contact engagement adapted, in the securing and contact engagement, to reduce the compressive force on the crystal longitudinally thereof.
  • the cooperating contact elements consist of a right angular rigid contact fitted to the lower right hand comer of the socket and composed of an internally threaded horizontal flange portion II and the integral laterally spaced vertical flanges or bars IS. The rigid contact is secured in position by the threaded engagement therewith of the terminal pin 5' as best shown in Fig. 2.
  • the resilient or spring contact Hi Positioned to cooperate therewith there is provided the resilient or spring contact Hi, apertured at its left end portion to receive the threaded end of terminal pin 5 and rigidly secured in position by the nut I8 threaded to the pin.
  • This spring contact element is formed with an engaging tip portion [9 disposed in acute angular relation to the engaging surface of the rigid contact flanges i5 and with the intermediate or connecting portion upturned to provide a bearing shoulder portion 20 positioned in engagement with the central boss or shoulder 2
  • the width of the engaging tip portion is of the spring contact is such as to permit of its being received between the flanges I!
  • the improved contact and securing engagement with the crystal as thus afforded, in addition to reducing axial pressure on the crystal, further provides for electrical contact engagement with the electrode at the beveled end portions inwardly of the outer or maximum plane of vibration of the crystal or inwardly toward its neutral axis thereby obtaining electrical contact with a minimum restrictive influence upon the natural vibration.
  • a frequency determining unit of the character described comprising a container providing a recess for the reception of a resonant element, 2. crystal element positioned in the recess operative engagement with the crystal and comprising electrode engaging portions extending in substantially right angular relation and podtioned to engage the bevel electrode extensions and at least one of said contacts being resilient.
  • a frequency determining unit of the character described comprising a container providing a recess for the reception of a resonant element, a crystal element positioned in the recess and provided with electrodes on its opposite faces and having opposite ends with beveled edge portions and with the electrodes extended thereon, electric contact elements positioned for cooperative supporting and circuit closing engagement with the crystal element and having electrode engaging portions positioned in substantially right angular relation to engage the respective electrodes on the opposite bevel extensions thereof at one end only of the crystal and means in said container for engaging the crystal element to hold it in position.
  • a frequency determining unit of the character described comprising a container formed to provide a recess for the reception of a resonant element, a crystal element adapted for vibration in the shear mode positioned in the recess and provided with electrodes on its opposite faces and formed at its ends with beveled edge portions with the electrodes extended thereon, electric contact elements positioned for cooperative engagement with the crystal element and comprising electrode engaging portions in substantially right angular relation to engage the bevel electrode extensions and said engaging portions being laterally spaced for electrical separation.
  • a frequency determining unit of the character described comprising a container body formed with a substantially rectangular recess for the reception of a resonant element, a. crystal element positioned in the recess diagonally thereof with the supporting engagement in one corner of the recess, said crystal element being provided with electrodes on its opposite faces and formed at its ends with beveled edge portions with the electrodes extended thereon, electric contact and supporting elements positioned in the diametriand provided with electrodes on its opposite faces cally opposite corner of the recess from the supporting corner aforesaid, said contact elements comprising a stationary angular member having laterally spaced vertical contact'bars and a resilient contact element having a contact portion positioned to project between the bars and to have an acute angular relation thereto and terminal members connected to the respective contact elements.
  • a piezoelectric frequency determining element comprising an elongated rectangular crysto! plate provided with electrode coatings on its opposite faces and formed at least at one end with a beveled edge portion with the electrode coating extended thereon.
  • a piezoelectric frequency determining element comprising an elongated rectangular plate crystal provided with electrode coatings on its opposite faces and formed at least at one end with beveled ed e portions with the electrode coatings extended thereon.
  • a piezoelectric frequency determining element comprisingan elongated rectangular plate crystal provided with electrode coatings on its opposite faces and formed at its opposite ends with beveled edge portions and having the electric coatings coextensive with the-beveled portions substantially as described.
  • a frequency determining unit of the char positioned to engage the electrodes at one edge surface of the crystal only.
  • a frequency determining unit of the character described comprising a container providing a chamber for the reception of a resonant element, a crystal element positioned within the chamber and provided with electrodes on its 0pposite faces and formed with a beveled edge over which the electrodes are extended, electric contact elements positioned for cooperative engagement with the crystal and comprising electrode engaging portions engaging the opposite electrode extensions to be in relativel sharp angular rela- I tion to the electrode surfaces engaged thereby, at least one of said contacts being resilient and said contacts being positioned to engage the electrodes at one edge surface of the crystal only.
  • a frequency determining unit of the character described comprising a container providing a rectangularchamber for the reception of a resonant element, a crystal element positioned obliquely within the chamber and provided with electrodes on its opposite faces, electric contact elements positioned for cooperative supporting engagement with the crystal and comprising electrode engaging portions in relatively small angular relation to opposite electrode surfaces en- Based thereby at least one of said contacts being resilient and said contacts being positioned to engage the electrodes at one edge surface of the crystal only.

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
US513140A 1943-12-06 1943-12-06 Piezoelectric crystal holder Expired - Lifetime US2395841A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE461049D BE461049A (en(2012)) 1943-12-06
NL64827D NL64827C (en(2012)) 1943-12-06
US513140A US2395841A (en) 1943-12-06 1943-12-06 Piezoelectric crystal holder
GB24403/44A GB584088A (en) 1943-12-06 1944-12-06 Piezo-electric crystal holder
FR913019D FR913019A (fr) 1943-12-06 1945-07-31 Cristal piézo-électrique et support
CH260420D CH260420A (de) 1943-12-06 1946-03-28 Piezoelektrischer Resonator.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US513140A US2395841A (en) 1943-12-06 1943-12-06 Piezoelectric crystal holder

Publications (1)

Publication Number Publication Date
US2395841A true US2395841A (en) 1946-03-05

Family

ID=24042043

Family Applications (1)

Application Number Title Priority Date Filing Date
US513140A Expired - Lifetime US2395841A (en) 1943-12-06 1943-12-06 Piezoelectric crystal holder

Country Status (6)

Country Link
US (1) US2395841A (en(2012))
BE (1) BE461049A (en(2012))
CH (1) CH260420A (en(2012))
FR (1) FR913019A (en(2012))
GB (1) GB584088A (en(2012))
NL (1) NL64827C (en(2012))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440064A (en) * 1944-01-13 1948-04-20 Gen Electric Piezoelectric crystal apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001045A (en) * 1975-03-03 1977-01-04 Sangamo Weston Limited Thermocouple

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440064A (en) * 1944-01-13 1948-04-20 Gen Electric Piezoelectric crystal apparatus

Also Published As

Publication number Publication date
CH260420A (de) 1949-03-15
BE461049A (en(2012))
GB584088A (en) 1947-01-07
FR913019A (fr) 1946-08-27
NL64827C (en(2012))

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