GB848529A - Improved piezo-electric vibrators - Google Patents

Improved piezo-electric vibrators

Info

Publication number
GB848529A
GB848529A GB1579558A GB1579558A GB848529A GB 848529 A GB848529 A GB 848529A GB 1579558 A GB1579558 A GB 1579558A GB 1579558 A GB1579558 A GB 1579558A GB 848529 A GB848529 A GB 848529A
Authority
GB
United Kingdom
Prior art keywords
width
plate
electrodes
length
effective width
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
GB1579558A
Inventor
Alan Frank Bernard Wood
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
Priority to GB1579558A priority Critical patent/GB848529A/en
Priority to BE578641A priority patent/BE578641A/en
Publication of GB848529A publication Critical patent/GB848529A/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
    • H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
    • H03H9/19—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of quartz

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

848,529. Piezo-electric crystals. STANDARD TELEPHONES & CABLES Ltd. May 15, 1959 [May 16, 1958], No. 15795/58. Drawings to Specification. Class 40(8). The effective width b of the electrodes of a rectangular crystal plate varies along the length of the plate according to the expression b = a sin n#x/l where x is the distance from one end of the plate, I is its total length, a is the maximum effective width of the electrodes and n is the order of the desired overtone (for the fundamental Á= 1). The shape of the electrodes causes damping of undesired overtones. The electrodes need not be similar, symmetrical or completely superposed, the effective width being the width of the superposed portions. The invention may be applied to quartz plates having a length-width ratio greater than 4. In one embodiment, the electrodes are arranged in n completely superposed pairs, alternate pairs being connected in antiphase. If the fundamental frequency is to be used, each side of the plate is provided with a single electrode having a maximum width at the centre of the plate equal to the width of the plate.
GB1579558A 1958-05-16 1958-05-16 Improved piezo-electric vibrators Expired GB848529A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1579558A GB848529A (en) 1958-05-16 1958-05-16 Improved piezo-electric vibrators
BE578641A BE578641A (en) 1958-05-16 1959-05-13 Piezo-Electric vibrator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1579558A GB848529A (en) 1958-05-16 1958-05-16 Improved piezo-electric vibrators

Publications (1)

Publication Number Publication Date
GB848529A true GB848529A (en) 1960-09-21

Family

ID=10065593

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1579558A Expired GB848529A (en) 1958-05-16 1958-05-16 Improved piezo-electric vibrators

Country Status (2)

Country Link
BE (1) BE578641A (en)
GB (1) GB848529A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096653A2 (en) * 1982-06-04 1983-12-21 Statek Corparation Extensional mode piezoelectric microresonator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0096653A2 (en) * 1982-06-04 1983-12-21 Statek Corparation Extensional mode piezoelectric microresonator
EP0096653A3 (en) * 1982-06-04 1985-11-21 Statek Corparation Extensional mode piezoelectric microresonator

Also Published As

Publication number Publication date
BE578641A (en) 1959-11-13

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