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GB560219A - Improvements in moving coil loud-speakers and microphones and like electro-acoustic apparatus - Google Patents

Improvements in moving coil loud-speakers and microphones and like electro-acoustic apparatus

Info

Publication number
GB560219A
GB560219A GB696443A GB696443A GB560219A GB 560219 A GB560219 A GB 560219A GB 696443 A GB696443 A GB 696443A GB 696443 A GB696443 A GB 696443A GB 560219 A GB560219 A GB 560219A
Authority
GB
United Kingdom
Prior art keywords
microphones
speakers
electro
acoustic apparatus
loud
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
GB696443A
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.)
WALTER HEWIT ALLAN
Original Assignee
WALTER HEWIT ALLAN
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 WALTER HEWIT ALLAN filed Critical WALTER HEWIT ALLAN
Priority to GB696443A priority Critical patent/GB560219A/en
Publication of GB560219A publication Critical patent/GB560219A/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
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Landscapes

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

Abstract

560,219. Loud-speakers and microphones. ALLAN, W. H. May 4, 1943, No. 6964. [Class 40 (iv)] In a moving-coil loud-speaker, microphone or like electro-acoustic apparatus the length of the moving-coil 9 is so related to that of the gap between the pole-pieces that during normal operation the coil remains wholly in the gap, so remaining in a uniform magnetic field, and the pole-pieces 5, 6 are so shaped that their cross-section is greatest at the boundary of the gap and diminishes away from it.
GB696443A 1943-05-04 1943-05-04 Improvements in moving coil loud-speakers and microphones and like electro-acoustic apparatus Expired GB560219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB696443A GB560219A (en) 1943-05-04 1943-05-04 Improvements in moving coil loud-speakers and microphones and like electro-acoustic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB696443A GB560219A (en) 1943-05-04 1943-05-04 Improvements in moving coil loud-speakers and microphones and like electro-acoustic apparatus

Publications (1)

Publication Number Publication Date
GB560219A true GB560219A (en) 1944-03-24

Family

ID=9824053

Family Applications (1)

Application Number Title Priority Date Filing Date
GB696443A Expired GB560219A (en) 1943-05-04 1943-05-04 Improvements in moving coil loud-speakers and microphones and like electro-acoustic apparatus

Country Status (1)

Country Link
GB (1) GB560219A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078618B (en) * 1957-08-01 1960-03-31 Peter Grassmann Annular gap magnet system with cylindrical permanent magnets made of oxide material for dynamic loudspeakers
US2942071A (en) * 1954-10-01 1960-06-21 Rca Corp Horn-type transducer
US4590333A (en) * 1984-06-14 1986-05-20 John Strohbeen Multidriver loudspeaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2942071A (en) * 1954-10-01 1960-06-21 Rca Corp Horn-type transducer
DE1078618B (en) * 1957-08-01 1960-03-31 Peter Grassmann Annular gap magnet system with cylindrical permanent magnets made of oxide material for dynamic loudspeakers
US4590333A (en) * 1984-06-14 1986-05-20 John Strohbeen Multidriver loudspeaker

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