GB1410822A - Electroacoustic arrangements - Google Patents

Electroacoustic arrangements

Info

Publication number
GB1410822A
GB1410822A GB4592172A GB4592172A GB1410822A GB 1410822 A GB1410822 A GB 1410822A GB 4592172 A GB4592172 A GB 4592172A GB 4592172 A GB4592172 A GB 4592172A GB 1410822 A GB1410822 A GB 1410822A
Authority
GB
United Kingdom
Prior art keywords
electrode
sheet
microphone
source
voltage
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
GB4592172A
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
Priority to GB4592172A priority Critical patent/GB1410822A/en
Priority to DE19722261600 priority patent/DE2261600A1/en
Priority to NL7313654A priority patent/NL7313654A/xx
Publication of GB1410822A publication Critical patent/GB1410822A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
    • H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
    • H01G7/021—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric
    • H01G7/023—Electrets, i.e. having a permanently-polarised dielectric having an organic dielectric of macromolecular compounds
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets

Abstract

1410822 Piezoelectric transducers; microphone circuits MARCONI CO Ltd 3 Oct 1973 [5 Oct 1972] 45921/72 Heading H4J A microphone or other electro-acoustic transducer comprises a sheet 1 (Fig. 1) of polymer or plastics material which is permanently polarized and has electrodes 2, 3 on its opposite faces 4, 5. The sheet a preferably of polyvinylidene chloride, polyethylene, polyethylene terephthalate, polyvinyl fluoride, polytrifluorochlorethylene or nylon. Electrode 2 has a conductive arm 6 while electrode 3 has a conductive arm 8 extending in the opposite directions. Wires (13, 14), Fig. 2 (not shown), are secured to the arms 6, 8 by conductive epoxy resin or by mechanical means. Sheet 1 is polarized by heating it, together with the electrodes 2, 6 and arms 3, 8, to 100‹ C. and applying a voltage of 500V (equivalent to an electric field of 150 kV cm<-1> between faces 4, 5 for one hour whilst heating is maintained. The sheet is then cooled to room temperature while maintaining the applied voltage. The sheet 1 is held taut between two clamping discs (10, 11) Fig. 3 (not shown) of plastics material. One disc (10) has a central circular aperture (15) to expose electrode 2 to acoustic waves. It is thought that the transducer relies upon the piezoelectric effect. The microphone 16 (Fig. 4) is connected between ground and the gate electrode 18 of a F.E.T. 19. Drain electrode 20 is grounded while source electrode 22 is connected via resistor 23 (68 K#) to the negative terminal of a voltage source 24. Bias for the gate electrode 18 is derived via a resistor 25 (10<12> Q) from the negative terminal of source 24. The output is taken from terminals 26, 27.
GB4592172A 1972-10-05 1972-10-05 Electroacoustic arrangements Expired GB1410822A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4592172A GB1410822A (en) 1972-10-05 1972-10-05 Electroacoustic arrangements
DE19722261600 DE2261600A1 (en) 1972-10-05 1972-12-15 SOUND FREQUENCY DETECTOR
NL7313654A NL7313654A (en) 1972-10-05 1973-10-04

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4592172A GB1410822A (en) 1972-10-05 1972-10-05 Electroacoustic arrangements

Publications (1)

Publication Number Publication Date
GB1410822A true GB1410822A (en) 1975-10-22

Family

ID=10439108

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4592172A Expired GB1410822A (en) 1972-10-05 1972-10-05 Electroacoustic arrangements

Country Status (3)

Country Link
DE (1) DE2261600A1 (en)
GB (1) GB1410822A (en)
NL (1) NL7313654A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500635A1 (en) * 1981-02-25 1982-08-27 United Kingdom Government IMPROVEMENTS ON UNDERWATER ACOUSTIC DEVICES

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5562494A (en) * 1978-11-05 1980-05-10 Ngk Spark Plug Co Pieozoelectric converter for electric string instrument
US4280018A (en) * 1979-05-14 1981-07-21 Strobotronix, Inc. Integrated piezoelectric sound transducer and preamplifier
DE2942641A1 (en) * 1979-10-22 1981-04-30 Deutsche Itt Industries Gmbh, 7800 Freiburg Integrated device for insertion into telephone receiver - is substitute carbon microphone and has P-enrichment FET
GB2176369B (en) * 1985-05-09 1988-10-05 Plessey Co Plc Improvements in and relating to microphones

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2500635A1 (en) * 1981-02-25 1982-08-27 United Kingdom Government IMPROVEMENTS ON UNDERWATER ACOUSTIC DEVICES

Also Published As

Publication number Publication date
NL7313654A (en) 1974-04-09
DE2261600A1 (en) 1974-04-25

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Legal Events

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