GB610297A - Improvements in electrostatic microphones and loud-speakers - Google Patents

Improvements in electrostatic microphones and loud-speakers

Info

Publication number
GB610297A
GB610297A GB10848/46A GB1084846A GB610297A GB 610297 A GB610297 A GB 610297A GB 10848/46 A GB10848/46 A GB 10848/46A GB 1084846 A GB1084846 A GB 1084846A GB 610297 A GB610297 A GB 610297A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
plates
cellulose
case
loudspeaker
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
GB10848/46A
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.)
S E M Sarl ETS
Original Assignee
S E M Sarl ETS
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 S E M Sarl ETS filed Critical S E M Sarl ETS
Publication of GB610297A publication Critical patent/GB610297A/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
    • 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
    • H04R19/02—Loudspeakers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

610,297. Electrostatic instruments. ETABLISSEMENTS S.E.M. April 9, 1946, No. 10848. Convention date, Jan. 22. [A Specification was laid open to inspection under Sect. 91 of the Acts, June 17, 1946.] Drawings to Specification. [Class 40 (iv)] A condenser microphone or loudspeaker comprises two rigid plates preferably gridded, with a permanently charged dielectric membrane stretched between them. In the case of a microphone, vibrations of the diaphragm cause varying potential differences between the plates and in the case of the loudspeaker, varying potential differences across the plates cause the diaphragm to vibrate. The diaphragm is composed of one of the following substances which retain their charges for long periods, e.g. polythene, cellulose nitrate, cellulose acetate, cellulose acetobutyrate, dichloroethylene polysulphide, benzylcellulose or polymers of vinyl acetate. The diaphragm may be charged to a potential of 10,000 to 15,000 volts either by contact with a source of high potential or by friction.
GB10848/46A 1946-01-22 1946-04-09 Improvements in electrostatic microphones and loud-speakers Expired GB610297A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR252811X 1946-01-22

Publications (1)

Publication Number Publication Date
GB610297A true GB610297A (en) 1948-10-13

Family

ID=8884273

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10848/46A Expired GB610297A (en) 1946-01-22 1946-04-09 Improvements in electrostatic microphones and loud-speakers

Country Status (3)

Country Link
BE (1) BE464634A (en)
CH (1) CH252811A (en)
GB (1) GB610297A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659022A (en) * 1951-05-22 1953-11-10 Tele King Corp Electrostatic deflection system
US2910539A (en) * 1956-07-27 1959-10-27 William L Hartsfield Microphones
US3008013A (en) * 1954-07-20 1961-11-07 Ferranti Ltd Electrostatic loudspeakers
US3118022A (en) * 1961-08-07 1964-01-14 Bell Telephone Labor Inc Electroacoustic transducer
US3458713A (en) * 1966-11-01 1969-07-29 Northern Electric Co Polycarbonate electrets
US3696505A (en) * 1968-07-10 1972-10-10 Tno Unilaterally metallized electret foil
US3748727A (en) * 1968-07-11 1973-07-31 W Swain Method of making electret transducers
DE2330800A1 (en) * 1973-06-16 1975-01-09 Sennheiser Electronic Electrostatic electroacoustic transducer - is balanced push-pull transducer with inner electrode between two outer electrodes

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659022A (en) * 1951-05-22 1953-11-10 Tele King Corp Electrostatic deflection system
US3008013A (en) * 1954-07-20 1961-11-07 Ferranti Ltd Electrostatic loudspeakers
US3008014A (en) * 1954-07-20 1961-11-07 Ferranti Ltd Electrostatic loudspeakers
US2910539A (en) * 1956-07-27 1959-10-27 William L Hartsfield Microphones
US3118022A (en) * 1961-08-07 1964-01-14 Bell Telephone Labor Inc Electroacoustic transducer
US3458713A (en) * 1966-11-01 1969-07-29 Northern Electric Co Polycarbonate electrets
US3696505A (en) * 1968-07-10 1972-10-10 Tno Unilaterally metallized electret foil
US3748727A (en) * 1968-07-11 1973-07-31 W Swain Method of making electret transducers
DE2330800A1 (en) * 1973-06-16 1975-01-09 Sennheiser Electronic Electrostatic electroacoustic transducer - is balanced push-pull transducer with inner electrode between two outer electrodes

Also Published As

Publication number Publication date
BE464634A (en)
CH252811A (en) 1948-01-31

Similar Documents

Publication Publication Date Title
GB657624A (en) Improvements in or relating to electro-mechanical transducers
GB1350226A (en) Piezoelectric electro-acoustic transducers
GB1033001A (en) Electroacoustic transducers
GB610297A (en) Improvements in electrostatic microphones and loud-speakers
GB927370A (en) Improvements in or relating to electro-acoustic transducers
GB851938A (en) Improvements in and relating to electro-acoustical transducers
GB911866A (en) Condenser microphones
FR939508A (en) Vibrating membrane intended in particular for microphones, pick-ups, loudspeakers and electro-acoustic devices in general
GB857413A (en) Improvements in or relating to cone loudspeakers
GB1007891A (en) Improvements in an electroacoustic transducer
JPS57123798A (en) Motional feedback type speaker
GB759236A (en) Improvements in or relating to loudspeakers
GB248845A (en) Improvements in and relating to loud speakers for wireless telephony, and the like
GB870960A (en) Electrostatic microphone
GB625014A (en) Improvements in or relating to acoustic devices
GB668343A (en) Improvements relating to ultra-sonic sound generators
FR940524A (en) Improvements to microphones and electrostatic speakers
FR1003570A (en) Improvements to microphones and electrostatic speakers
GB529233A (en) Improvements in apparatus for conversion of wave motion into electrical energy and the converse
FR2417909A1 (en) ACOUSTIC PRESSURE (OR CHARGE) REGULATOR
GB804034A (en) Device for the improvement of loudspeakers
GB650808A (en) Improvements in electrical sound reproducing apparatus
GB1121718A (en) Improvements in or relating to microphones
GB622828A (en) Improvements in or relating to loudspeakers and like electro-acoustic transducers
GB614638A (en) Improvements in and relating to loudspeaking telephone systems