GB552835A - Piezoelectric crystal apparatus - Google Patents

Piezoelectric crystal apparatus

Info

Publication number
GB552835A
GB552835A GB4070/42A GB407042A GB552835A GB 552835 A GB552835 A GB 552835A GB 4070/42 A GB4070/42 A GB 4070/42A GB 407042 A GB407042 A GB 407042A GB 552835 A GB552835 A GB 552835A
Authority
GB
United Kingdom
Prior art keywords
crystal
axis
frequency
degrees
held
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
Application number
GB4070/42A
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
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB552835A publication Critical patent/GB552835A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/56—Monolithic crystal filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02007—Details of bulk acoustic wave devices
    • H03H9/02062—Details relating to the vibration mode
    • H03H9/0207—Details relating to the vibration mode the vibration mode being harmonic

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

552,835. Piezo-electric crystals. STANDARD TELEPHONES & CABLES Ltd. March 27, 1942, No. 4070. Convention date, Oct. 19, 1940. [Class 40 (v), A rectangular quartz crystal 1 of length L and width W is arranged for longitudinal vibration in the nth harmonic of the applied frequency by the provision of n pairs of oppositely arranged electrodes 3, 4 of length l where L = n l. The major faces are parallel to an X axis of the mother crystal and inclined at an angle ° to the Z axis in the range 44 to 51 degrees, while the dimensions L and W are at 45 degrees to the X axis and the ratio eM is in the range 311 to 314, the precise values of the angle ° and the dimensional ratio being chosen to give a small temperature coefficient of frequency. The electrodes may be comprised of interconnected foils extending only over one edge of the,crystal, Fig.5 (not shown) thus leaving the other edges free to be ground for frequency correction. Also a small series condenser having an opposite temperature coefficient may be used to correct frequency deviations due to temperature. The crystal may be held between conducting clamps at central points 6 or held by attached spring wires. Specifications 479,979, 510,379, 533,731 are referred to.
GB4070/42A 1940-10-19 1942-03-27 Piezoelectric crystal apparatus Expired GB552835A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US361857A US2259529A (en) 1940-10-19 1940-10-19 Piezoelectric crystal apparatus

Publications (1)

Publication Number Publication Date
GB552835A true GB552835A (en) 1943-04-27

Family

ID=23423704

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4070/42A Expired GB552835A (en) 1940-10-19 1942-03-27 Piezoelectric crystal apparatus

Country Status (2)

Country Link
US (1) US2259529A (en)
GB (1) GB552835A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117968A (en) * 1982-03-16 1983-10-19 Seiko Instr & Electronics Gt-cut piezo-electric resonator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117968A (en) * 1982-03-16 1983-10-19 Seiko Instr & Electronics Gt-cut piezo-electric resonator

Also Published As

Publication number Publication date
US2259529A (en) 1941-10-21

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