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GB1185819A - Improvements in or relating to Piezo-Electric Crystal Units - Google Patents

Improvements in or relating to Piezo-Electric Crystal Units

Info

Publication number
GB1185819A
GB1185819A GB1271069A GB1271069A GB1185819A GB 1185819 A GB1185819 A GB 1185819A GB 1271069 A GB1271069 A GB 1271069A GB 1271069 A GB1271069 A GB 1271069A GB 1185819 A GB1185819 A GB 1185819A
Authority
GB
United Kingdom
Prior art keywords
piezo
relating
electric crystal
crystal units
march
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
GB1271069A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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 Marconi Co Ltd filed Critical Marconi Co Ltd
Publication of GB1185819A publication Critical patent/GB1185819A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H3/00—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators
    • H03H3/007—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks
    • H03H3/02—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks
    • H03H3/04—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of piezoelectric or electrostrictive resonators or networks for obtaining desired frequency or temperature coefficient

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

1,185,819. Piezo-electric resonators. MARCONI CO. Ltd. 11 March, 1969 [28 March, 1968], No. 12710/69. Heading H1E. A method of mass-loading a crystal (e.g. quartz) resonator consists in anodizing the aluminium films which constitute the electrodes. The anodization may be carried out in a non- solvent electrolyte using voltages as high as 1000 V. The voltage determines the thickness of the oxide film and hence the extent of the mass-loading. Thus, the resonant frequency may be adjusted by applying a calculated voltage.
GB1271069A 1968-03-28 1969-03-11 Improvements in or relating to Piezo-Electric Crystal Units Expired GB1185819A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU35681/68A AU413304B2 (en) 1968-03-28 1968-03-28 Improvements in quartz crystal units

Publications (1)

Publication Number Publication Date
GB1185819A true GB1185819A (en) 1970-03-25

Family

ID=3722986

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1271069A Expired GB1185819A (en) 1968-03-28 1969-03-11 Improvements in or relating to Piezo-Electric Crystal Units

Country Status (2)

Country Link
AU (1) AU413304B2 (en)
GB (1) GB1185819A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2917698A1 (en) * 1978-05-09 1979-11-22 Philips Nv PIEZOELECTRIC DEVICE
EP0721669A1 (en) * 1993-09-30 1996-07-17 Motorola, Inc. Method for manufacturing a frequency control device
US6566979B2 (en) * 2001-03-05 2003-05-20 Agilent Technologies, Inc. Method of providing differential frequency adjusts in a thin film bulk acoustic resonator (FBAR) filter and apparatus embodying the method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2917698A1 (en) * 1978-05-09 1979-11-22 Philips Nv PIEZOELECTRIC DEVICE
EP0721669A1 (en) * 1993-09-30 1996-07-17 Motorola, Inc. Method for manufacturing a frequency control device
EP0721669A4 (en) * 1993-09-30 1997-11-26 Motorola Inc Method for manufacturing a frequency control device
US6566979B2 (en) * 2001-03-05 2003-05-20 Agilent Technologies, Inc. Method of providing differential frequency adjusts in a thin film bulk acoustic resonator (FBAR) filter and apparatus embodying the method

Also Published As

Publication number Publication date
AU413304B2 (en) 1971-05-17
AU3568168A (en) 1970-03-26

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee