GB670586A - Improvements in or relating to granule-type electro-acoustic transducers - Google Patents

Improvements in or relating to granule-type electro-acoustic transducers

Info

Publication number
GB670586A
GB670586A GB11184/48A GB1118448A GB670586A GB 670586 A GB670586 A GB 670586A GB 11184/48 A GB11184/48 A GB 11184/48A GB 1118448 A GB1118448 A GB 1118448A GB 670586 A GB670586 A GB 670586A
Authority
GB
United Kingdom
Prior art keywords
casing
diaphragm
granule
front electrode
electrodes
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
GB11184/48A
Inventor
Dennis Edward Skelton
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 GB670586A publication Critical patent/GB670586A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers

Landscapes

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

Abstract

670,586. Microphones. STANDARD TELEPHONES & CABLES, Ltd. April 22, 1949 [April 23, 1948], No. 11184/48. Class 40 (iv). In a granule-type transmitter, a casing member on or in which are mounted all other parts and which forms the peripheral wall of the granule chamber has seatings for an acoustic diaphragm and for two diaphragm-type electrodes. A sub-assembly comprising a mica disc 27, the back electrode 15, a nickel silver cover 26 and an insulating ring 28 of resin-impregnated canvas are held in a recess in the die-cast zinc or aluminium casing 1 by a lead ring 29, as described in Specification 594,082. Similarly held in the casing 1 is a domed front electrode 12, the distance between the two electrodes being least along the axis of the transmitter. Both electrodes are made of carbonized nickel as described in Specification 594,116. A coating of white cellulose enamel insulates the casing and the annular portion of the front electrode from the granules, or an annulus of silk may be inserted between the front electrode and the granules as described in Specification 670,585. The diaphragm 21 is similar to those of Specifications 616,158 and 631,970, being a plastic annulus with a serrated metal flange bonded thereto and frictionally engaging the domed portion of the front electrode 12. The diaphragm 21 is peripherally clamped between the casing 1 and a die-cast disc 24 which are held together by a plastic or brass ring 25 having spun over flanges. The central aperture in the diaphragm is protected by a moisture cover 23. An aluminium alloy plate 17 secured in the casing is pierced in three places 20, the resulting upturned metal prongs being compressed to provide the correct amount of damping for the diaphragm 21. A plug secured with clay shellac cement, closes the granule chamber filling hole 32. The back of the casing 1 is coated with a colloidal suspension of carbon or a silver paste to give a good contact surface. In a modification, Fig. 2, the filling hole is in the cover-plate 35 and the back electrode 37 is apertured, the space between being used as a granule reservoir.
GB11184/48A 1948-04-23 1948-04-23 Improvements in or relating to granule-type electro-acoustic transducers Expired GB670586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB277063X 1948-04-23

Publications (1)

Publication Number Publication Date
GB670586A true GB670586A (en) 1952-04-23

Family

ID=10263970

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11184/48A Expired GB670586A (en) 1948-04-23 1948-04-23 Improvements in or relating to granule-type electro-acoustic transducers

Country Status (5)

Country Link
BE (1) BE488632A (en)
CH (1) CH277063A (en)
DE (1) DE873102C (en)
FR (2) FR984897A (en)
GB (1) GB670586A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960998C (en) * 1954-02-26 1957-03-28 Standard Elek K Ag Carbon microphone with movable immersion electrode

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952823C (en) * 1953-12-02 1956-11-22 Friedrich Reiner Attachment of carbon electrodes to metal or plastic membranes for carbon core microphones
DE1061825B (en) * 1954-02-26 1959-07-23 Hans Widmaier Coal semolina microphone capsule
DE1095318B (en) * 1955-03-18 1960-12-22 Standard Elektrik Lorenz Ag Carbon microphone with movable immersion electrode
DE1125485B (en) * 1959-03-25 1962-03-15 Siemens Ag Carbon microphone
DE1181745B (en) * 1962-09-15 1964-11-19 Telefonbau Resistance microphone, in particular carbon microphone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960998C (en) * 1954-02-26 1957-03-28 Standard Elek K Ag Carbon microphone with movable immersion electrode

Also Published As

Publication number Publication date
CH277063A (en) 1951-08-15
DE873102C (en) 1953-04-09
FR984897A (en) 1951-07-11
BE488632A (en)
FR63027E (en) 1955-07-13

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