US1974914A - Diaphragm centering means - Google Patents

Diaphragm centering means Download PDF

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Publication number
US1974914A
US1974914A US588902A US58890232A US1974914A US 1974914 A US1974914 A US 1974914A US 588902 A US588902 A US 588902A US 58890232 A US58890232 A US 58890232A US 1974914 A US1974914 A US 1974914A
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US
United States
Prior art keywords
diaphragm
centering means
coil
centering
lugs
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 - Lifetime
Application number
US588902A
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English (en)
Inventor
Gabbert Fritz
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US1974914A publication Critical patent/US1974914A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering

Definitions

  • One object of the invention consists of a centering means for the diaphragm of a sound converter or for the oscillation coil in electrodynamic loudspeakers; to be more precise, the invention concerns centering means in which the parts adapted to secure centering are attached at parts of the magnetic system or the casing located outside the oscillation coil.
  • a further object is to provide a centering means all parts of which lie in one plane. This makes for low cost of production, ease of manufacture and facility of assembly with its diaphragm. Other objects of the invention will become apparent as the description thereof proceeds.
  • Centering means of this kind are known, for instance, in this form that a metallic ring with a crimped border is press-fitted onto the body of the coil, lugs of insulation or yielding non-magnetic metal being connected with the edge or rim which are screwed fast onto the outer poles.
  • this embodiment quite apart from the difiiculties attendant upon manufacture, involves the shortcoming that the lugs after a short while work loose from the metallic edge and result in clinking noises.
  • the centering means consists of a uniform planar part which is punched out in a simple manner either from a sheet of insulation material or a plate of non-magnetic metal.
  • the device consists of an annular ring or part presenting preferably three lugs spaced 120 degrees apart and being bent outwardly, and these lugs are attached to projections on the outer pole piece or the casing in which the diaphragm is housed.
  • Diaphragm and ring may be connected by pasting or cementing or in any other desired manner.
  • Figs. 1 and 2 illustrate various details of a loudspeaker or sound converter constructed in accordance with the invention.
  • An annular ring 1 is provided with three or more tangentially arranged projecting portions 2 which at their extremities carry radially arranged lugs 3, each lug having a circular opening 4.
  • the front face 5 of the ring is fiat or planar and its exterior periphery 6 is preferably circular as shown.
  • the centering device is preferably made of thin fibrous material such as cardboard which has a high degree of flexibility. Or it may be formed of any resilient non-magnetic metal.
  • the cone diaphragm '7 has three slots or openings 8' near its small end, the arms 2-3 being inserted through these and cement or other adhesive being applied to the exterior surface 6 of ring 1 to secure diaphragm '7 securely thereto.
  • the fiat face 5 of the centering member may be also cemented to the rear face of member 8.
  • the exterior pole piece 9 of an electro-dynamic speaker carries three projecting portions 10 having tapped holes 11 therein. Screws 12 or other securing means are passed through the holes 4 into the holes 11 and thereby carry the voice coil 13 secured to coil form 14 centrally in the air gap 15.
  • the large end of cone '7 may be supported within an aperture of framework 16 in any preferred manner.
  • a conical diaphragm having a voice coil secured to one end thereof, and provided near said end with at least three openings therein, a magnet having an annular air gap in which said coil is located, and means for centering said coil in said gap and also serving to close the small end of said conical diaphragm
  • a fiat member having a circular periphery seated against the interior surface of said diaphragm, said member being provided with a plurality of outwardly extending arms passing through the openings in said diaphragm, said arms being formed of resilient material and means engaging the end portions of said arms arranged to anchor them in fixed position.
  • means for yieldingly supporting said coil with respect to longitudinal motion and preventing motion thereof in a radial direction comprising a flat annular disc composed of thin cardboard said disc having a plurality of tangentially extending arms terminating in radially shaped end portions, each end portion having an aperture and securing means passing through said apertures and arranged to immovably secure said end portions in fixed position.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US588902A 1930-12-20 1932-01-26 Diaphragm centering means Expired - Lifetime US1974914A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE591586T 1930-12-20

Publications (1)

Publication Number Publication Date
US1974914A true US1974914A (en) 1934-09-25

Family

ID=7847867

Family Applications (1)

Application Number Title Priority Date Filing Date
US588902A Expired - Lifetime US1974914A (en) 1930-12-20 1932-01-26 Diaphragm centering means

Country Status (2)

Country Link
US (1) US1974914A (de)
DE (1) DE591586C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729616A (en) * 1994-06-01 1998-03-17 Nokia Technology Gmbh Centering diaphragm
US20050111689A1 (en) * 2003-11-21 2005-05-26 True Technologies Inc. Loudspeaker with assembly and performance improvements

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5729616A (en) * 1994-06-01 1998-03-17 Nokia Technology Gmbh Centering diaphragm
US20050111689A1 (en) * 2003-11-21 2005-05-26 True Technologies Inc. Loudspeaker with assembly and performance improvements

Also Published As

Publication number Publication date
DE591586C (de) 1934-10-12

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