GB857275A - 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
GB857275A
GB857275A GB3300858A GB3300858A GB857275A GB 857275 A GB857275 A GB 857275A GB 3300858 A GB3300858 A GB 3300858A GB 3300858 A GB3300858 A GB 3300858A GB 857275 A GB857275 A GB 857275A
Authority
GB
United Kingdom
Prior art keywords
granule
plastic
silk
diaphragm
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
GB3300858A
Inventor
Anthony Crisp Beadle
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
Priority to GB3300858A priority Critical patent/GB857275A/en
Publication of GB857275A publication Critical patent/GB857275A/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

Landscapes

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

Abstract

857,275. Microphones. STANDARD TELEPHONES & CABLES Ltd. Oct. 16, 1958, No. 33008/58. Class 40 (4). A carbon-granule chamber is defined by a movable dome-shaped front electrode 10, a fixed shell-type back electrode 7 formed from thin metallic sheet, and one or more flat insulating washers 6 which close the opening between the respective peripheries of the two electrodes. The washers 6 may be of silk or plastic, while the electrodes are of carbonized nickel or gold-plated brass, carbonized or plated at least on their granule-contacting surfaces. Parts of these surfaces may be masked to reduce the conducting area. An acoustic resistance washer 28 may be of silk or plastic or material of the type described in Specification 819,146. A plastic membrane 25 protects the diaphragm 23. Terminal 21 is connected to the front electrode 10 by way of metal disc 19, casing 1, and diaphragm 23. Specification 613,552 also is referred to.
GB3300858A 1958-10-16 1958-10-16 Improvements in or relating to granule-type electro-acoustic transducers Expired GB857275A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3300858A GB857275A (en) 1958-10-16 1958-10-16 Improvements in or relating to granule-type electro-acoustic transducers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3300858A GB857275A (en) 1958-10-16 1958-10-16 Improvements in or relating to granule-type electro-acoustic transducers

Publications (1)

Publication Number Publication Date
GB857275A true GB857275A (en) 1960-12-29

Family

ID=10347294

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3300858A Expired GB857275A (en) 1958-10-16 1958-10-16 Improvements in or relating to granule-type electro-acoustic transducers

Country Status (1)

Country Link
GB (1) GB857275A (en)

Similar Documents

Publication Publication Date Title
US3991285A (en) Microphone having an electrostatic cartridge having a structural electrical resistor
GB574611A (en) Improvements in or relating to directional microphones
GB857275A (en) Improvements in or relating to granule-type electro-acoustic transducers
SE325614B (en)
GB1003835A (en) Improvements in or relating to condenser microphones
US2014427A (en) Microphone
GB869234A (en) Transducer and vibratory diaphragm
GB757111A (en) Improvements in or relating to electric transducers
GB594116A (en) Improvements in or relating to microphones
US1909375A (en) Acoustic device
GB801352A (en) Improvements in or relating to condenser microphone arrangements
GB1276196A (en) Electro-acoustic transducer
US1565581A (en) Telephone transmitter
GB494293A (en) Improvements in or relating to telephone transmitters
GB613552A (en) Improvements in or relating to granule telephone transmitters
GB956113A (en) Improvements in or relating to hearing aids
GB594082A (en) Improvements in or relating to microphones
JPS55166400A (en) Capacitor microphone
GB836959A (en) Small-size condenser microphone
GB1067344A (en) Electro-mechanical transducer arrangement
GB803284A (en) Improvements in or relating to telephone transmitters
GB705523A (en) Improvements relating to microphones
US1545828A (en) Transmitter
GB597183A (en) Improvements in or relating to electric amplifiers, and deafaids incorporating the same
GB437973A (en) An improved means of sound amplification and projection