US1923965A - Acoustic diaphragm - Google Patents

Acoustic diaphragm Download PDF

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Publication number
US1923965A
US1923965A US480203A US48020330A US1923965A US 1923965 A US1923965 A US 1923965A US 480203 A US480203 A US 480203A US 48020330 A US48020330 A US 48020330A US 1923965 A US1923965 A US 1923965A
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United States
Prior art keywords
diaphragm
acoustic diaphragm
cone
conical
diaphragms
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Expired - Lifetime
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US480203A
Inventor
Joseph B Brennan
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Individual
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Individual
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Priority to US480203A priority Critical patent/US1923965A/en
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Publication of US1923965A publication Critical patent/US1923965A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Definitions

  • My invention relates to improvements in the construction of diaphragms for the producing andreproducing of sound.
  • the objects of my invention are to produce a diaphragm of uniform thickness and structure without any scams or splices or folds or wrinkles and in so constructing such a diaphragm to eliminate socalled paper rattles as well as to lower the cost of constructing such diaphragms.
  • diaphragms of this sort are produced by cutting out a piece of flat fibrous material and forming it in a cone-shaped mold and cementing it in such a manner as to construct a conical diaphragm therefrom.
  • fibrous material will be taken from a vat or container of raw stock in a liquid or dry powdered state and uniformly spread on a conical form or forms and then pressed in such a manner as to force this material to assume the desired conical or funnelshape conforming to the shape of the mold in which it is pressed, thus obtaining a smooth surfaced diaphragm of uniform structural thickness, strength.
  • Figure 1 representaa cone so formed; and Fig. 2 represents a modifled form of the invention.
  • Fig. 1 represents a cone consisting of a hollow circular truncated cone with a hollow cylindrical throat extending from the truncated end of the I cone and having a flange of the same material extending around the base, the whole being constructed as a unit without seams, folds, wrinkles or joints of any kind.
  • Figure 2 represents a seamless one-piece diaphragm with a body in the form of a truncated cone and having a flange extending around the base of the conical part.
  • An acoustic diaphragm comprising a conical wall, an annular flange surrounding the JOSEPH B. BRENNAN.

Description

Aug, 22, 1933 J B BRENNAN 1,923,965
A TX FT l C II EXTHRAUM Filed Sopt. 6, 1930 w im-wmnlol Patented Aug. 22, 1933 UNITED STATES PATENT OFFICE My invention relates to improvements in the construction of diaphragms for the producing andreproducing of sound. The objects of my invention are to produce a diaphragm of uniform thickness and structure without any scams or splices or folds or wrinkles and in so constructing such a diaphragm to eliminate socalled paper rattles as well as to lower the cost of constructing such diaphragms.
Ordinarily diaphragms of this sort are produced by cutting out a piece of flat fibrous material and forming it in a cone-shaped mold and cementing it in such a manner as to construct a conical diaphragm therefrom. In my process the fibrous material will be taken from a vat or container of raw stock in a liquid or dry powdered state and uniformly spread on a conical form or forms and then pressed in such a manner as to force this material to assume the desired conical or funnelshape conforming to the shape of the mold in which it is pressed, thus obtaining a smooth surfaced diaphragm of uniform structural thickness, strength. I
Referring to the accompanying drawing which forms a part of this specification, Figure 1 representaa cone so formed; and Fig. 2 represents a modifled form of the invention.
texture and Fig. 1 represents a cone consisting of a hollow circular truncated cone with a hollow cylindrical throat extending from the truncated end of the I cone and having a flange of the same material extending around the base, the whole being constructed as a unit without seams, folds, wrinkles or joints of any kind.
Figure 2 represents a seamless one-piece diaphragm with a body in the form of a truncated cone and having a flange extending around the base of the conical part.
What I claim is:
1. An acoustic diaphragm comprising a conical wall, an annular flange surrounding the JOSEPH B. BRENNAN.
US480203A 1930-09-06 1930-09-06 Acoustic diaphragm Expired - Lifetime US1923965A (en)

Priority Applications (1)

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US480203A US1923965A (en) 1930-09-06 1930-09-06 Acoustic diaphragm

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US480203A US1923965A (en) 1930-09-06 1930-09-06 Acoustic diaphragm

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US1923965A true US1923965A (en) 1933-08-22

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US480203A Expired - Lifetime US1923965A (en) 1930-09-06 1930-09-06 Acoustic diaphragm

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429470A (en) * 1934-06-04 1947-10-21 Jensen Mfg Company Loud-speaker with pressure-equalized chamber system enclosing flux gap
US2440439A (en) * 1942-07-04 1948-04-27 Permoflux Corp Permanent magnet electrodynamic transducer
US2551556A (en) * 1945-09-12 1951-05-01 E D Mccurdy Acoustic diaphragm with plural voice coil supports
DE1159027B (en) * 1960-06-21 1963-12-12 Sennheiser Electronic Membrane for electroacoustic transducer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429470A (en) * 1934-06-04 1947-10-21 Jensen Mfg Company Loud-speaker with pressure-equalized chamber system enclosing flux gap
US2440439A (en) * 1942-07-04 1948-04-27 Permoflux Corp Permanent magnet electrodynamic transducer
US2551556A (en) * 1945-09-12 1951-05-01 E D Mccurdy Acoustic diaphragm with plural voice coil supports
DE1159027B (en) * 1960-06-21 1963-12-12 Sennheiser Electronic Membrane for electroacoustic transducer

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