GB1297028A - - Google Patents

Info

Publication number
GB1297028A
GB1297028A GB1297028DA GB1297028A GB 1297028 A GB1297028 A GB 1297028A GB 1297028D A GB1297028D A GB 1297028DA GB 1297028 A GB1297028 A GB 1297028A
Authority
GB
United Kingdom
Prior art keywords
electret
solvent
oxide film
oxide
oxide layer
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
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
Priority claimed from AU54467/69A external-priority patent/AU436364B2/en
Priority claimed from AU54468/69A external-priority patent/AU5446869A/en
Priority claimed from AU54470/69A external-priority patent/AU411997B2/en
Application filed filed Critical
Publication of GB1297028A publication Critical patent/GB1297028A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04R19/005—Electrostatic transducers using semiconductor materials

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

1297028 Electrets MARCONI CO Ltd 13 Feb 1970 [5 May 1969 (3)] 7013/70 Heading H1M [Also in Division H4] An electret layer is constituted by an oxide layer formed on and from a metal electrode, e.g. of tantalum, aluminium or an alloy containing one or both. Preferably the oxide layer is formed by anodizing, using solvent or non- solvent electrolytes, or plasma techniques. By control of the electric field used in film forming, the oxide film becomes an electret. Permanent polarization is enhanced by irradiating the oxide film with high energy electrons.
GB1297028D 1969-05-05 1970-02-13 Expired GB1297028A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU54467/69A AU436364B2 (en) 1969-05-05 1969-05-05 Inorganic electret
AU54468/69A AU5446869A (en) 1969-05-05 1969-05-05 Capacitor transducer
AU54470/69A AU411997B2 (en) 1969-05-05 Electret transducer

Publications (1)

Publication Number Publication Date
GB1297028A true GB1297028A (en) 1972-11-22

Family

ID=27154927

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1297028D Expired GB1297028A (en) 1969-05-05 1970-02-13

Country Status (1)

Country Link
GB (1) GB1297028A (en)

Similar Documents

Publication Publication Date Title
GB1158523A (en) Solid State Electrochemical Devices
GB1464490A (en) Beam-plasma type ion source
GB1262319A (en) Thin film capacitor
GB1190957A (en) Triggerable Vacuum Gap Devices
GB1297028A (en)
ES436870A1 (en) Cathode ray tube with electrostatic multipole focusing lens
GB1047706A (en) Improvements in or relating to electrical devices wherein an electric arc may be produced in operation
GB1152014A (en) Improvements in Ion Source Apparatus
GB1204210A (en) Semiconductor device
GB1267029A (en)
US2871424A (en) Electrolytic capacitor
GB1225272A (en)
Pollack et al. On Mott's theory of formation of protective oxide films
ES288692A1 (en) A method to separate a solar polar from a polar solution (Machine-translation by Google Translate, not legally binding)
GB1118423A (en) Improvements in method and composition for forming oxide dielectric films
GB1491839A (en) Ion beam apparatus
GB1012728A (en) Triggered staple gap switch
EZEKIEL et al. Investigations of coherent oscillations in an argon ion laser plasma tube(Argon ion laser plasma tube anodic coherent oscillations and noise suppression, using secondary discharge between anode and auxiliary cathode)
GB1176713A (en) Method of Producing Fluoride Films on Metals.
GB1403507A (en) Electron radiographic imaging chamber with current enhancement
GB1536174A (en) Fast triplanar detector
JPH0228227B2 (en)
JPS57100346A (en) Electron capturing type detector
GB1338217A (en) Lasers
FR2148801A5 (en) Plasma generator - for charged particles using solenoid field in two electrode discharge chambers

Legal Events

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