GB544834A - Piezoelectric crystal apparatus - Google Patents

Piezoelectric crystal apparatus

Info

Publication number
GB544834A
GB544834A GB3491/41A GB349141A GB544834A GB 544834 A GB544834 A GB 544834A GB 3491/41 A GB3491/41 A GB 3491/41A GB 349141 A GB349141 A GB 349141A GB 544834 A GB544834 A GB 544834A
Authority
GB
United Kingdom
Prior art keywords
crystal
degrees
screws
march
low temperature
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
GB3491/41A
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 GB544834A publication Critical patent/GB544834A/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
    • H03H9/02—Details
    • H03H9/02007—Details of bulk acoustic wave devices
    • H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
    • H03H9/02023—Characteristics of piezoelectric layers, e.g. cutting angles consisting of quartz
    • 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
    • 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
    • H03H9/05—Holders; Supports
    • H03H9/0504—Holders; Supports for bulk acoustic wave devices
    • 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
    • H03H9/05—Holders; Supports
    • H03H9/10—Mounting in enclosures
    • H03H9/1007—Mounting in enclosures for bulk acoustic wave [BAW] devices
    • H03H9/1014—Mounting in enclosures for bulk acoustic wave [BAW] devices the enclosure being defined by a frame built on a substrate and a cap, the frame having no mechanical contact with the BAW device
    • 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
    • H03H9/566—Electric coupling means therefor

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

544,834. Piezo electric crystals. STANDARD TELEPHONES & CABLES, Ltd. March 14, 1941, No. 3491. Convention date, March 29, 1940. [Class 40 (v)] A quartz crystal plate 1 adapted to have a low temperature coefficient in a longitudinal mode is cut from the mother crystal such that its length L is substantially in the YZ plane and is inclined from 0 degrees to 10 degrees to the Y axis, its major surfaces are inclined from 30 degrees to 48 degrees to the YZ plane, and the ratio of length L to width W lies between .25 and .85. Curves are given to show how a low temperature coefficient crystal can be chosen from this range to provide desired frequencies. Fig. 4 shows a holder for a crystal plate 1 having four electrodes deposited on its surfaces. The crystal is clamped between four screws 25, 26 the screws 25 being biased by springs 27 carried by the insulating supporting block 10. The screws 25, 26 also serve for the connection of leads the other ends of which are attached to contact pins 12 carried by the base 13 of the evacuated metal bulb 11. The assembly is resiliently mounted on phosphor bronze springs 30, 31. Other methods of mounting the crystal may be used. Specifications 533,731 and 540,184 are referred to.
GB3491/41A 1940-03-29 1941-03-14 Piezoelectric crystal apparatus Expired GB544834A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US326764A US2268413A (en) 1940-03-29 1940-03-29 Piezoelectric crystal apparatus

Publications (1)

Publication Number Publication Date
GB544834A true GB544834A (en) 1942-04-29

Family

ID=23273607

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3491/41A Expired GB544834A (en) 1940-03-29 1941-03-14 Piezoelectric crystal apparatus

Country Status (4)

Country Link
US (1) US2268413A (en)
BE (1) BE441496A (en)
FR (1) FR867832A (en)
GB (1) GB544834A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444312A (en) * 1945-05-01 1948-06-29 Rca Corp Art of sealing metal casings enclosing vibratile elements
US2498585A (en) * 1945-01-01 1950-02-21 Thomas C Flanagan Piezoelectric crystal holder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498585A (en) * 1945-01-01 1950-02-21 Thomas C Flanagan Piezoelectric crystal holder
US2444312A (en) * 1945-05-01 1948-06-29 Rca Corp Art of sealing metal casings enclosing vibratile elements

Also Published As

Publication number Publication date
US2268413A (en) 1941-12-30
FR867832A (en) 1941-11-29
BE441496A (en)

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