US1831235A - Diaphragm mounting - Google Patents

Diaphragm mounting Download PDF

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Publication number
US1831235A
US1831235A US353091A US35309129A US1831235A US 1831235 A US1831235 A US 1831235A US 353091 A US353091 A US 353091A US 35309129 A US35309129 A US 35309129A US 1831235 A US1831235 A US 1831235A
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US
United States
Prior art keywords
diaphragm
center
discs
support
combination
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
US353091A
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English (en)
Inventor
Jr Frederick R Farrow
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.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1831235A publication Critical patent/US1831235A/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
    • H04R9/045—Mounting

Definitions

  • This invention relates to acoustic diaphragms-and more particularly to means for mounting the same.
  • l0 designates the casing of a loud speaker of any suitable construction, provided with a frusto-conical diaphragm 11 of any suitable size, construction and material and flexibly mounted at its periphery in any suitable way, as by an annulus 12 of flexible material such as leather, attached to a ring 13, which may be of tibrous material, by which it may be attached, as by screws 14, to the rim 15 of the casing.
  • the illustrated structure is to be taken, however, as typical of any suitable device employing any suitable diaphragm which is to be centered as hereinafter described.
  • the diaphragm is provided at its center, integral therewith or suitably attached thereto, with a generally cylindrical extension 16, upon which is wound the coil 17.
  • the usual magnet frame or central pole 18 of the loud speaker may be provided with a fixed post or pillar 18a to which the center of the diaphragm is fixedly attached in any suitable manner.
  • the centering device for the diaphgram is composed of a pair of discs 19, andof woven material, preferably unbleached muslin, attached together by a suitable cement or adhesive, preferably rubber cement, said discs being preferably so arranged that the threads of one disc are disposed at an angle of substantially with the threads of the other disc.
  • the adhesive employed is preferably such as to permeate the fibers of the discs as well as attach the discs together.
  • Said discs are attached to the diaphragm at the small end of the cone in any suitable way, either directly or by means of an interposed annulus, such as a ring 21 of suitable material, brown paper for example, which adhesive or cement, such as ambroid, and which may be provided with a flange, segments or tabs 22 for attachment tothe composite disc 19, 20, byany suitable adhesive.
  • the center of the composite disc 19, 20 is provided with an aperture for receiving a screw 24 which is threaded into the outer end of fixed post 18a and rigidly secures said disc at its centerto the fixed portion of the loud speaker assembly.
  • a washer 23 of any suitable material,-such as paper, is preferably attached to the composite disc for interposition between the head of the screw 24 and said disc.
  • the magnet frame structure including central pole 18 and fixed post 18a, and the use of screw 24 to fixedly secure the center of the diaphragm to a fixed port-ion of the loud speaker assembly form no part of the present invention, and maybe of any suitab e construction, the form shown being acknowledged to be well known in the loud speaker art.
  • a similar structure is disclosed in Patent No. 1,798,157, in the name of Carleton D. Haigis, which is assigned to the same party as the present invention.
  • a centeringdevice constructed as heretofore described is very durable and has a long life without deterioration, distortion, loosening or rattling. At the same time it is very flexible and imposes little restraint on the vibration of the diaphragm.
  • the centering device While it is preferred to construct the centering device'in the manner heretofore described, some of the advantages of the invention can be obtained by using other woven materials such as fine wire screen, or other materials such as collodion or the like for permeating or securing the discs together, or by arranging the discs with their threads at other angles, etc. Additional discsmay be employed if desired and even a single disc has r been found to give improved results over devices previously in use. While the invention has been described as embodied in a center attachment, the invention may also be employed in a peripheral attachment for diaphragms.
  • the invention may also be employed with other types of diaphragms and in other types of structures than those illusj trated, and also as a center attachment to may be attached to'the cone by a suitable vibratory as well as non-vibratory parts. Reference is therefore to be had to the appended claims for a definition of the limits of the invention. -What is claimed is:
  • attaching means at the center of the diaphragm comprising woven material peripherally secured to the diaphragm.
  • taching means at the center of the diaphragm comprising unbleached muslin secured at its periphery to the diaphragm.
  • attaching means at the center of the diaphragm comprising a plurality of discs of woven ma.- terial secured together and peripherally secured to the diaphragm.
  • attaching means at the center of the diaphra comprising a plurality of discs of unbleached muslin secured together and peripherallysecured to the diaphragm.
  • attaching means at the center of the diaphragm comprising a plurality of discs of woven material attached together with cement and peripherally secured to the diaphragm.
  • attaching means at the center of the diaphragm comprising a plurality of discs of woven material secured together with their threads at substantially 45 and peripherally secured to said diaphragm.
  • attaching means at the center of the diaphragm comprising a pluralit of discs of unbleached muslin secured toget er by cement and peripherally secured to said dia hragm.
  • attaching means at the center of the diaphragm comprising a plurality of discs of unbleached muslin secured together with their threads at substantially an angle of 45 and peripherally secured to said diaphragm.
  • attachin g means at the center of the diaphragm comprising a plurality of discs of unbleached muslin cemented together with cement with their threads disposed at substantially an angle of 45 to each other and peripherally secured to said diaphragm.
  • a diaphragm a support for said diaphragm, and means for fixedly mounting the center of said diaphragm on said support comprising a plurality of discs of unbleached muslin secured together by cement and peripherally secured to said diaphragm, said discs being centrally attached to said support.
  • means for mounting said diaphragm comprising layers of woven material secured together.
  • means for mounting said diaphragm comprising layers of woven material secured to- FREDERICK R. FARROVV, JR.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Electromagnets (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US353091A 1929-02-13 1929-04-06 Diaphragm mounting Expired - Lifetime US1831235A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4882/29A GB324826A (en) 1929-02-13 1929-02-13 Supporting means for acoustic diaphragms

Publications (1)

Publication Number Publication Date
US1831235A true US1831235A (en) 1931-11-10

Family

ID=9785602

Family Applications (1)

Application Number Title Priority Date Filing Date
US353091A Expired - Lifetime US1831235A (en) 1929-02-13 1929-04-06 Diaphragm mounting

Country Status (5)

Country Link
US (1) US1831235A (enrdf_load_stackoverflow)
DE (1) DE552016C (enrdf_load_stackoverflow)
FR (1) FR685304A (enrdf_load_stackoverflow)
GB (1) GB324826A (enrdf_load_stackoverflow)
NL (1) NL28294C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469773A (en) * 1934-06-04 1949-05-10 Jensen Mfg Company Loud-speaker diaphragm support member
US2526836A (en) * 1944-12-08 1950-10-24 Reproducers And Amplifiers Ltd Electrodynamic sound reproducer
US6938726B1 (en) 2001-10-16 2005-09-06 Mitek Corporation Field rebuildable low frequency loudspeaker driver having a removable diaphragm assembly, parts kit and method for rebuilding a loudspeaker driver in the field

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003265B (de) * 1952-11-07 1957-02-28 Walter Kirbach Zentrier- und Halteteile von Lautsprechermembranen und aehnlichen akustischen Membranen
US4102221A (en) * 1976-07-19 1978-07-25 General Electric Company Cross-ply composite flywheel
US4207778A (en) * 1976-07-19 1980-06-17 General Electric Company Reinforced cross-ply composite flywheel and method for making same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2469773A (en) * 1934-06-04 1949-05-10 Jensen Mfg Company Loud-speaker diaphragm support member
US2526836A (en) * 1944-12-08 1950-10-24 Reproducers And Amplifiers Ltd Electrodynamic sound reproducer
US6938726B1 (en) 2001-10-16 2005-09-06 Mitek Corporation Field rebuildable low frequency loudspeaker driver having a removable diaphragm assembly, parts kit and method for rebuilding a loudspeaker driver in the field

Also Published As

Publication number Publication date
DE552016C (de) 1932-06-08
FR685304A (fr) 1930-07-09
NL28294C (enrdf_load_stackoverflow)
GB324826A (en) 1930-02-06

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