GB462888A - Improvements in or relating to electro-mechanical impedances - Google Patents

Improvements in or relating to electro-mechanical impedances

Info

Publication number
GB462888A
GB462888A GB24812/36A GB2481236A GB462888A GB 462888 A GB462888 A GB 462888A GB 24812/36 A GB24812/36 A GB 24812/36A GB 2481236 A GB2481236 A GB 2481236A GB 462888 A GB462888 A GB 462888A
Authority
GB
United Kingdom
Prior art keywords
wire
impedance
vibration
zero
shaped
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
GB24812/36A
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 GB462888A publication Critical patent/GB462888A/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
    • H03H9/0023—Balance-unbalance or balance-balance networks
    • H03H9/0095—Balance-unbalance or balance-balance networks using 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
    • H03H9/24—Constructional features of resonators of material which is not piezoelectric, electrostrictive, or magnetostrictive
    • 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
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

- 462,888. Impedance networks. STANDARD TELEPHONES & CABLES, Ltd. Sept. 11, 1936, No. 24812. Convention date, Oct. 2, 1935. [Class 40 (iii)] According to one aspect of the invention, a two - terminal impedance element comprises a stretched wire 1, Fig. 1, between magnetic polepieces 2, 3, so shaped that the field diminishes sinusoidally from the centre outwards. The back E.M.F. generated. when the wire vibrates is then zero for harmonic vibrations, and the impedance element exhibits a " resonance " only at the fundamental mode of vibration. Alternatively, the polepieces may be plane and the wire extend by <1>/6 of its length beyond each end, Fig. 8 (not shown) ; the back E.M.F. generated for the 3rd harmonic mode of vibration is then zero. In a further modification, a stretched membrane 8, Fig. 4, is positioned between electrostatic electrodes 6, 7 shaped to give a field varying sinusoidally from the centre outwards. Impedance elements of this last type are indicated at 13, 13<1>, 14, 14<1>, Fig. 7, in a lattice type wave filter. U.S.A. Specification 1,828,454 is referred to.
GB24812/36A 1935-10-02 1936-09-11 Improvements in or relating to electro-mechanical impedances Expired GB462888A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US43154A US2094062A (en) 1935-10-02 1935-10-02 Electromechanical impedance

Publications (1)

Publication Number Publication Date
GB462888A true GB462888A (en) 1937-03-17

Family

ID=21925767

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24812/36A Expired GB462888A (en) 1935-10-02 1936-09-11 Improvements in or relating to electro-mechanical impedances

Country Status (5)

Country Link
US (1) US2094062A (en)
DE (1) DE745757C (en)
FR (1) FR816361A (en)
GB (1) GB462888A (en)
NL (1) NL47516C (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2958040A (en) * 1958-02-10 1960-10-25 J B T Instr Inc Electrical frequency responsive device
US3218846A (en) * 1960-10-26 1965-11-23 Chemetron Corp Ultrasonic flaw testing apparatus
US3164987A (en) * 1961-03-28 1965-01-12 Bosch Arma Corp Electrostatic vibration transducer
US3190129A (en) * 1961-07-10 1965-06-22 Bosch Arma Corp Accelerometer and parts therefor
US3465597A (en) * 1965-05-25 1969-09-09 Singer General Precision Vibrating-column accelerometer
WO2013091736A1 (en) * 2011-12-23 2013-06-27 L-3 Communications Magnet-Motor Gmbh Permanent magnet excited electric machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE494716C (en) * 1927-07-08 1930-04-29 Elektrotechnischer Trust Der S Piezoelectric vibration generator
GB344034A (en) * 1929-11-28 1931-03-02 James Robinson Improvements in or relating to wireless receiving systems
US1906250A (en) * 1931-11-18 1933-05-02 Union Switch & Signal Co Electric filtering apparatus

Also Published As

Publication number Publication date
US2094062A (en) 1937-09-28
NL47516C (en)
FR816361A (en) 1937-08-06
DE745757C (en) 1944-05-22

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