GB1037244A - Improvements in or relating to moving coil transducers - Google Patents

Improvements in or relating to moving coil transducers

Info

Publication number
GB1037244A
GB1037244A GB713064A GB713064A GB1037244A GB 1037244 A GB1037244 A GB 1037244A GB 713064 A GB713064 A GB 713064A GB 713064 A GB713064 A GB 713064A GB 1037244 A GB1037244 A GB 1037244A
Authority
GB
United Kingdom
Prior art keywords
moving coil
iron
relating
shaped
feb
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
GB713064A
Inventor
Michael Lawrence Gayford
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 GB713064A priority Critical patent/GB1037244A/en
Publication of GB1037244A publication Critical patent/GB1037244A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

1,037,244. Magnetic structures. STANDARD TELEPHONES & CABLES Ltd. Feb. 19, 1965 [Feb. 20, 1964], No. 7130/64. Heading H1H. [Also in Division H4] In a moving coil microphone, one of the polepieces is made of porous material, e.g. sintered iron of density 6 gms./c.c. A cylindrical permanent magnet 1 is located in an iron, steel or sintered iron cup-shaped yoke 2 and a ring-shaped polepiece 3 is force fitted into a seating 4 in the open end of the cup. A dome-shaped polepiece 12 is secured to the free end of the magnet. The density of the sintered parts may be graduated from one part of the magnetic circuit to another.
GB713064A 1964-02-20 1964-02-20 Improvements in or relating to moving coil transducers Expired GB1037244A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB713064A GB1037244A (en) 1964-02-20 1964-02-20 Improvements in or relating to moving coil transducers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB713064A GB1037244A (en) 1964-02-20 1964-02-20 Improvements in or relating to moving coil transducers

Publications (1)

Publication Number Publication Date
GB1037244A true GB1037244A (en) 1966-07-27

Family

ID=9827188

Family Applications (1)

Application Number Title Priority Date Filing Date
GB713064A Expired GB1037244A (en) 1964-02-20 1964-02-20 Improvements in or relating to moving coil transducers

Country Status (1)

Country Link
GB (1) GB1037244A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2133693A1 (en) * 1971-04-14 1972-12-01 Philips Nv

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2133693A1 (en) * 1971-04-14 1972-12-01 Philips Nv
US3790724A (en) * 1971-04-14 1974-02-05 Philips Corp Electromagnetic microphone including at least one acoustic resistance

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