GB539047A - Improvements in piezo-electric thickness-mode crystals - Google Patents

Improvements in piezo-electric thickness-mode crystals

Info

Publication number
GB539047A
GB539047A GB7660/40A GB766040A GB539047A GB 539047 A GB539047 A GB 539047A GB 7660/40 A GB7660/40 A GB 7660/40A GB 766040 A GB766040 A GB 766040A GB 539047 A GB539047 A GB 539047A
Authority
GB
United Kingdom
Prior art keywords
piezo
electric
april
ground
electric thickness
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
GB7660/40A
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
Marconis Wireless Telegraph 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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB539047A publication Critical patent/GB539047A/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
    • H03H9/15—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/42—Piezoelectric device making

Abstract

539,047. Piezo-electric crystals. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. April 29, 1940, No. 7660. Convention date, April 29, 1939. [Class 40 (v)] One of the major surfaces of a piezo-electric crystal vibrating in its thickness mode is ground to form two surfaces such as 2b, 2c sloping away from the central region of the crystal, to reduce spurious resonance, and a further surface 2f may be ground on to adjust the frequency. Many modifications are described in which the angle of bevel is varied, or the ridge is not central, and in which the surfaces are curved. Specification 441, 438 is referred to.
GB7660/40A 1939-04-29 1940-04-29 Improvements in piezo-electric thickness-mode crystals Expired GB539047A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US270886A US2261791A (en) 1939-04-29 1939-04-29 Piezoelectric thickness-mode quartz crystal

Publications (1)

Publication Number Publication Date
GB539047A true GB539047A (en) 1941-08-26

Family

ID=23033252

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7660/40A Expired GB539047A (en) 1939-04-29 1940-04-29 Improvements in piezo-electric thickness-mode crystals

Country Status (2)

Country Link
US (1) US2261791A (en)
GB (1) GB539047A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003016A1 (en) * 1987-09-28 1989-04-06 Leybold Aktiengesellschaft Device for determining the relevant thicknesses of variable layers of material on a substrate

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2799789A (en) * 1949-04-06 1957-07-16 John M Wolfskill Piezoelectric crystal apparatus and method of making the same
GB679575A (en) * 1950-01-20 1952-09-17 Standard Telephones Cables Ltd Improvements in or relating to piezo-electric crystal plates
US2837667A (en) * 1953-06-10 1958-06-03 Philips Corp Piezo-electric quartz crystal plate
US3058015A (en) * 1960-05-03 1962-10-09 Nesh Florence Dissipation of high frequency vibratory energy
US3497732A (en) * 1968-07-23 1970-02-24 Bell Telephone Labor Inc Dt-cut quartz crystal
US3833825A (en) * 1973-04-11 1974-09-03 Honeywell Inc Wide-band electroacoustic transducer
JPS5069981A (en) * 1973-10-24 1975-06-11
JPS5247391A (en) * 1975-10-14 1977-04-15 Citizen Watch Co Ltd Quartz crystal oscillator for watch use
FR2424636A1 (en) * 1978-04-28 1979-11-23 Ebauches Sa Rectangular piezoelectric resonator - has AT cut form with thickness dependent on required frequency
JPS60232711A (en) * 1984-05-01 1985-11-19 Murata Mfg Co Ltd Piezoelectric vibrator
GB0402007D0 (en) * 2004-01-30 2004-03-03 Smiths Group Plc Acoustic devices and fluid-gauging
JP4563437B2 (en) * 2007-10-18 2010-10-13 日本電波工業株式会社 Quartz crystal unit consisting of a Y-cut plate rotated twice

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989003016A1 (en) * 1987-09-28 1989-04-06 Leybold Aktiengesellschaft Device for determining the relevant thicknesses of variable layers of material on a substrate

Also Published As

Publication number Publication date
US2261791A (en) 1941-11-04

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