GB849487A - Improvements in or relating to electrostatic sound transducers - Google Patents

Improvements in or relating to electrostatic sound transducers

Info

Publication number
GB849487A
GB849487A GB8224/57A GB822457A GB849487A GB 849487 A GB849487 A GB 849487A GB 8224/57 A GB8224/57 A GB 8224/57A GB 822457 A GB822457 A GB 822457A GB 849487 A GB849487 A GB 849487A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
fixed electrode
march
relating
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
GB8224/57A
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Publication of GB849487A publication Critical patent/GB849487A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

849,487. Telephone instruments. TELEFUNKEN G.m.b.H. March 13, 1957 [March 14, 1956], No. 8224/57. Class 40 (4). A condenser microphone or loud-speaker comprises an apertured fixed electrode 1 made of aluminium and a vibratable diaphragm 2, the surface of the fixed electrode being chemically or electrochemically oxidized so as to provide a slightly conductive layer 4 which prevents the build-up of surface charges during operation. The diaphragm may be slightly spaced from the fixed electrode, Fig. 1 (not shown), or may be in part contact with a roughened oxidecoated surface as shown in Fig. 2. In a modification of the latter embodiment, Fig. 3, a synthetic resin insulating layer 5 is interposed between the oxide layer and the diaphragm 6. The oxide layer may be formed by application of a solution of soda and potassium chromate in water at a temperature of 90‹ C. and may alternatively be applied to a surface of the -diaphragm. Specification 335,248 is referred to.
GB8224/57A 1956-03-14 1957-03-13 Improvements in or relating to electrostatic sound transducers Expired GB849487A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE849487X 1956-03-14

Publications (1)

Publication Number Publication Date
GB849487A true GB849487A (en) 1960-09-28

Family

ID=6775869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8224/57A Expired GB849487A (en) 1956-03-14 1957-03-13 Improvements in or relating to electrostatic sound transducers

Country Status (1)

Country Link
GB (1) GB849487A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081626A (en) * 1976-11-12 1978-03-28 Polaroid Corporation Electrostatic transducer having narrowed directional characteristic

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081626A (en) * 1976-11-12 1978-03-28 Polaroid Corporation Electrostatic transducer having narrowed directional characteristic

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