GB548157A - Piezoelectric crystal apparatus - Google Patents

Piezoelectric crystal apparatus

Info

Publication number
GB548157A
GB548157A GB11698/41A GB1169841A GB548157A GB 548157 A GB548157 A GB 548157A GB 11698/41 A GB11698/41 A GB 11698/41A GB 1169841 A GB1169841 A GB 1169841A GB 548157 A GB548157 A GB 548157A
Authority
GB
United Kingdom
Prior art keywords
degrees
plane
crystal
piezo
sept
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
GB11698/41A
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 GB548157A publication Critical patent/GB548157A/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
    • H03H9/02157—Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness

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

548,157. Piezo-electric crystals. STANDARD TELEPHONES & CABLES, Ltd. Sept. 12, 1941, No 11698. Convention date, Sept. 18, 1940. [Class 40 (v)] A piezo-electric quartz crystal 1 vibrating in a flexure mode is cut with the plane of its major surface parallel to the X axis, the length dimension is at an angle # of between 64 degrees and 73 degrees to the Z axis measured in the YZ plane and at an angle # of 45 degrees or 135 degrees to the X axis measured in the XY plane. The ratio of width to length W/L is in the range .05 to .08 corresponding values of W/L and # being chosen to give a zero temperature coefficient. Graphs are shown relating these quantities and frequency so that a zero temperature coefficient crystal may be designed for any frequency and having convenient dimensions. Fig. 3 shows the crystal with two pairs of oppositely energized electrodes as 10, 11, connection being made at the nodes 5 either by suspension wires or clamping pins for example by the means described in Specifications 239,175, [Class 40 (v)], and 467,724. Specification 540,184 and U.S.A. Specification 2,204,762 also are referred to.
GB11698/41A 1940-09-18 1941-09-12 Piezoelectric crystal apparatus Expired GB548157A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US548157XA 1940-09-18 1940-09-18

Publications (1)

Publication Number Publication Date
GB548157A true GB548157A (en) 1942-09-28

Family

ID=21993705

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11698/41A Expired GB548157A (en) 1940-09-18 1941-09-12 Piezoelectric crystal apparatus

Country Status (1)

Country Link
GB (1) GB548157A (en)

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