GB491263A - Improvements in or relating to permament magnets for sound transforming apparatus - Google Patents

Improvements in or relating to permament magnets for sound transforming apparatus

Info

Publication number
GB491263A
GB491263A GB1257937A GB1257937A GB491263A GB 491263 A GB491263 A GB 491263A GB 1257937 A GB1257937 A GB 1257937A GB 1257937 A GB1257937 A GB 1257937A GB 491263 A GB491263 A GB 491263A
Authority
GB
United Kingdom
Prior art keywords
arch
gap
relating
magnet assembly
magnetic material
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
GB1257937A
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
Priority to GB1257937A priority Critical patent/GB491263A/en
Publication of GB491263A publication Critical patent/GB491263A/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)
  • Prostheses (AREA)

Abstract

491,263. Sound-reproducing devices. HAUSDORF, E. May 3, 1937, No. 12579. [Class 40 (iv)] In a magnet assembly, particularly for telephone receivers, a magnetic member 2 has the shape of an arch bounded by parallel planes, a gap 4 for the moving coil 8 is formed in the crown portion of the arch and the centre polepiece 3 is mounted in a plate member 1 extending across the base of the arch-shaped member 2. A diaphragm 7, secured to the coil 8, is supported by a ring 5 which may be permanently secured to the member 2 by webs 6 or may be detachably mounted on the magnet assembly. The space between the gap 4 and the plate 1 may be partially or wholly enclosed by side plates of a non-magnetic material to form a resonating chamber. In a modification, Fig. 3 (not shown), the resonator is formed by a member attached to the under surface of the upper portion of the member 2. Arrangements are described in which the baseplate 1, arched member 2, and the centre polepiece 3 are selectively of soft iron or of a magnetic material.
GB1257937A 1937-05-03 1937-05-03 Improvements in or relating to permament magnets for sound transforming apparatus Expired GB491263A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1257937A GB491263A (en) 1937-05-03 1937-05-03 Improvements in or relating to permament magnets for sound transforming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1257937A GB491263A (en) 1937-05-03 1937-05-03 Improvements in or relating to permament magnets for sound transforming apparatus

Publications (1)

Publication Number Publication Date
GB491263A true GB491263A (en) 1938-08-30

Family

ID=10007239

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1257937A Expired GB491263A (en) 1937-05-03 1937-05-03 Improvements in or relating to permament magnets for sound transforming apparatus

Country Status (1)

Country Link
GB (1) GB491263A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801294A (en) * 1950-11-24 1957-07-30 Holmberg & Co Kommanditgesells Electrodynamic receiving apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801294A (en) * 1950-11-24 1957-07-30 Holmberg & Co Kommanditgesells Electrodynamic receiving apparatus

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