GB613552A - Improvements in or relating to granule telephone transmitters - Google Patents

Improvements in or relating to granule telephone transmitters

Info

Publication number
GB613552A
GB613552A GB18009/46A GB1800946A GB613552A GB 613552 A GB613552 A GB 613552A GB 18009/46 A GB18009/46 A GB 18009/46A GB 1800946 A GB1800946 A GB 1800946A GB 613552 A GB613552 A GB 613552A
Authority
GB
United Kingdom
Prior art keywords
granule
diaphragm
casing
synthetic resin
conductive
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
GB18009/46A
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.)
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 GB613552A publication Critical patent/GB613552A/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)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

613,552. Carbon-grain microphones; diaphragms. STANDARD TELEPHONES & CABLES, Ltd. June 14, 1946, No. 18009. Convention date, Oct. 29, 1943. [Class 40 (iv)] In a non-corrodible granule microphone capsule all the conducting parts except possibly for an external connecting member are made of conductive, e.g. graphite-impregnated, synthetic resin. In the capsule shown the electrical circuit is completed from the casing 1 to the diaphragm 3, the granule chamber 5 and the metal rivet 6 of which all except the last are of conductive synthetic resin. Insulating washers 8, 9 separate the rivet from the casing. The granule chamber cover 5 is closed by a cellulose acetate cover 6 and a felt pad 7 acts as a buffer between it and the diaphragm.
GB18009/46A 1943-10-29 1946-06-14 Improvements in or relating to granule telephone transmitters Expired GB613552A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL613552X 1943-10-29

Publications (1)

Publication Number Publication Date
GB613552A true GB613552A (en) 1948-11-30

Family

ID=19788177

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18009/46A Expired GB613552A (en) 1943-10-29 1946-06-14 Improvements in or relating to granule telephone transmitters

Country Status (3)

Country Link
CH (1) CH250533A (en)
FR (1) FR907524A (en)
GB (1) GB613552A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976947C (en) * 1952-06-25 1964-09-17 Standard Elek K Lorenz Ag Resilient clamping of the membrane of a speech or ear capsule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061825B (en) * 1954-02-26 1959-07-23 Hans Widmaier Coal semolina microphone capsule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976947C (en) * 1952-06-25 1964-09-17 Standard Elek K Lorenz Ag Resilient clamping of the membrane of a speech or ear capsule

Also Published As

Publication number Publication date
CH250533A (en) 1947-08-31
FR907524A (en) 1946-03-14

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