GB490010A - Improvements in or relating to permanent magnet assemblies for sound-transforming apparatus - Google Patents

Improvements in or relating to permanent magnet assemblies for sound-transforming apparatus

Info

Publication number
GB490010A
GB490010A GB3291/37A GB329137A GB490010A GB 490010 A GB490010 A GB 490010A GB 3291/37 A GB3291/37 A GB 3291/37A GB 329137 A GB329137 A GB 329137A GB 490010 A GB490010 A GB 490010A
Authority
GB
United Kingdom
Prior art keywords
permanent magnet
sound
relating
magnet
poleplate
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
GB3291/37A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB490010A publication Critical patent/GB490010A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

490,010. Sound-reproducing devices; magnets. HAUSDORF, E. Feb. 4, 1937, No. 3291. Convention date, Feb. 4, 1936. [Class 40 (iv)] [Also in Group XXXV] In a magnet assembly for moving-coil apparatus, having an external contour which is convex, triangular or trapezoidal in cross-section and having a poleplate b superimposed on a permanent magnet a of appropriate shape, the plate b has a central portion of reduced width on both sides of the centre polepiece c and has a portion b<1> of increased thickness around the aperture formed in the poleplate. The portion of the centre polepiece in contact with the permanent magnet is milled or knurled. The magnet is made of cobalt or oerstite steel and the gap may be provided with a magnetic or magnetizable lining.
GB3291/37A 1936-02-04 1937-02-04 Improvements in or relating to permanent magnet assemblies for sound-transforming apparatus Expired GB490010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE490010X 1936-02-04

Publications (1)

Publication Number Publication Date
GB490010A true GB490010A (en) 1938-08-04

Family

ID=6544046

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3291/37A Expired GB490010A (en) 1936-02-04 1937-02-04 Improvements in or relating to permanent magnet assemblies for sound-transforming apparatus

Country Status (2)

Country Link
FR (1) FR817318A (en)
GB (1) GB490010A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546344A (en) * 1946-12-31 1951-03-27 Univ Loudspeakers Inc Magnet structure
US2957053A (en) * 1956-02-21 1960-10-18 Gen Phones Corp Audio-electric translating device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE440964A (en) * 1939-10-05

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546344A (en) * 1946-12-31 1951-03-27 Univ Loudspeakers Inc Magnet structure
US2957053A (en) * 1956-02-21 1960-10-18 Gen Phones Corp Audio-electric translating device

Also Published As

Publication number Publication date
FR817318A (en) 1937-09-01

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