US1796335A - Acoustic diaphragm made of warped elementary surfaces with parallel edges - Google Patents

Acoustic diaphragm made of warped elementary surfaces with parallel edges Download PDF

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Publication number
US1796335A
US1796335A US452008A US45200830A US1796335A US 1796335 A US1796335 A US 1796335A US 452008 A US452008 A US 452008A US 45200830 A US45200830 A US 45200830A US 1796335 A US1796335 A US 1796335A
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United States
Prior art keywords
elements
diaphragm
acoustic diaphragm
warped
folded
Prior art date
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Expired - Lifetime
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US452008A
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English (en)
Inventor
Lumiere Louis
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Individual
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Individual
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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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • 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
    • H04R7/04—Plane diaphragms
    • 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
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed

Definitions

  • My invention relates to an acoustic diaphragm, square or rectangular in shape, made of warped trapezoidal elementary surfaces having parallel edges.
  • Such a diaphragm has the advantage of possessing the rigidity that is necessary for obtaining a high acoustic efficiency.
  • Figure 1 is a plan view of a paper ring with lines traced on it, said paper ring serving to make the acoustic diaphragm.
  • Figure 2 shows a part of said paper ring unfolded, after it has been plaited and cut along one radius, the edge of the inside circumference being developed along a straight line as it will be explained hereafter.
  • Figure 3 is a transverse section on the line ww of Figure 2 of an element consisting of a part of a ring.
  • Figure 4 is an end view corresponding to Figure 3.
  • Figures 5 and 6 are respectively an elevation and a transverse section of an acoustic diaphragm obtained by assembling together two parts of a ring similar to that of Figure 2.
  • Figure 7 is a sectional view showing how some points of the edge of the diaphragm are secured to the frame through cork or felt washers.
  • Figures 8, 9 and 10 show, on a larger scale, the middle part of the diaphragm thus obtained, in the vicinity of the plaited edges which are assembled together.
  • Figures 11 to 14 relate to different forms of the diaphragm.
  • the acoustic diaphragm is made of trapezoidal elementary surfaces a, Figure 1, limited by equidistant radiuses of a ring, the proportions of the inner and outer diameter of which may vary according to the warping conditions which give the necessary rigidity to the elements, when the latter have been folded and developed. Said elementary surfaces are next folded, and the ring is cut into parts, which are developed in such a manner that the inner circumference of said parts is disposed along a straight line. The length of said line depends on the dimensions of the diaphragm.
  • the parts of rings thus developed are, in horizontal projection, rectangular in shape, and the edges of the folds, on account of the 1gvarping that they are given, are slightly ent.
  • the relative dimensions of the inner and outer diameters of the ring may for instance, be chosen in the proportion of 1 to 2, and in that case, the folds, on the side of the larger bases of the trapezoidal elements, are at an angle of to each other.
  • two elements such as the one shown in Figures 2, 3 and 4 are assembled by placing them side by side, so that the folded large bases overlap each other, as it is shown on a larger scale in Figures 8 and 9; and said overlapping parts are glued together.
  • the common glued part is then pierced through, so as to enable to insert, in a direction perpendicular to the edges, a rigid barb I), made of aluminium, wood or any other material, thin and rather wide, which is stuck to the folded elements by means of small paper bands or better of a cellulosic varnish.
  • Said acoustic diaphragm may be mounted in a frame 0 made of wood or any suitable material, and fixed in position through cork or felt washers d which holdits straight edges in suitable points, so as to avoid any parasitic vibration.
  • Said diaphragm may be made of drawing paper, which subsequently, will be coated or not with a suitable varnish or any other material. It is also possible to use, for making the diaphragm, a very thin laminated sheet of aluminium, about 0.01 millimeter thick, or a sheet of any other similar light metal or alloy, lined with a sheet of a suitable paper, weighting, for instance 120 grammes by square meter, or of any other suitable substance.
  • the diaphragm according to the invention is made with a very thin laminated sheet of metal, lined with paper, a very good ISO Figures 5, 6, 8 and 9, one may use a tube of light metal or any other suitable material, passingthroughthe folds of the diaphragm, in the same way as the rod.
  • FIGS 11 and 12 show this embodiment of the invention.
  • rod 6 or 6 By actuating the rod or tube 6 or 6 by a -single motor, it-may be advantageous to actuate-said rod or tube by several motors connectedto several points of the rod ortube.
  • said points will be so dis- 26itributed along'therod or tube-as to set in vibration parts of the diaphragm havingequal areas.
  • rod 6 is actuated'in two points Aand B, which set in vibration, parallelly, equal areas Z and'm, as indicated, in'dotted lines, by their diagonals
  • rod bis actuated in three points A, 13,6, which set in vibration equal areas Z,- m, 1.
  • such points could be still multiplied.
  • a method for obtaining an acoustic diaphragm which consists in taking a ring of a thin material, in folding said ring along equidistant radiuses, in cutting it into elements of given length, invunfolding said elements so that their side corresponding to the inner circumference of the ring is applied alonga straight line and the edges of; their folds are all parallel, in applying two such elements one-against the other along their folded bases so that they slightly overlap each other and in gluing them together, in passing through'all the folds of the overlapping part arigid'piece and in fixing said piece to the folds, so that said rigid piece serves to transmit. the vibrations to the diaphragnn 2.
  • a rectangular acoustic diaphragm comprising two folded elements having each a straight sideand a'folded side and edges of folds parallel between themselves, means'for" securing together the folded sides of said elements, a rigid piece passing through the foldsiofboth elements,- means for fixing said metallic tube'p'assin'g'through the folds of both elements whereby the vibrations are transmitted to the diaphragm, means for fixing said tube to the elements, washers for holding the straight sidesofthe elements, and a frame for supporting said washers.
  • a rectangular acoustic diaphragm comprising two folded elements made of laminated aluminium having each a straight side and a folded side and-edges of their folds parallel to one another, means for securing together the folded sides of said elements, ,a' metallic tube passing through the folds ofboth elements whereby the vibrations are transmitted to the diaphragm, meansfor fixing said tube to the elements, washersfor holding the straight sides of the elements, and a frame for supportingwsaid washers.
  • a rectangular acoustic diaphragm comprising two folded elements made of laminated aluminium having each a straight side and a folded side and the edges of their folds parallel to one another, means forsecuring together thefolded SlClBS'Of said elements, a
  • a rectangular acoustic diaphragm comprising two folded elements made of'lami nated aluminium having'each a straight side and a folded side and edges of their folds parallel to one another, a paper lining on each folded element, means for securing together the folded sides of said elements, a metallic tube passing through the folds of both elements whereby the vibrations are transmitted to'the diaphragm, means forfixing-said tube to the elements, washers for holding the straight sides of the elements,

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Stringed Musical Instruments (AREA)
US452008A 1929-06-04 1930-05-13 Acoustic diaphragm made of warped elementary surfaces with parallel edges Expired - Lifetime US1796335A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR547840X 1929-06-04

Publications (1)

Publication Number Publication Date
US1796335A true US1796335A (en) 1931-03-17

Family

ID=8934455

Family Applications (1)

Application Number Title Priority Date Filing Date
US452008A Expired - Lifetime US1796335A (en) 1929-06-04 1930-05-13 Acoustic diaphragm made of warped elementary surfaces with parallel edges

Country Status (5)

Country Link
US (1) US1796335A (enrdf_load_html_response)
BE (1) BE370732A (enrdf_load_html_response)
DE (1) DE547840C (enrdf_load_html_response)
FR (5) FR692095A (enrdf_load_html_response)
GB (2) GB344290A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040003960A1 (en) * 2002-06-24 2004-01-08 Sawako Usuki Loudspeaker diaphragm

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182823A (en) * 1985-11-07 1987-05-20 Midlen Trading Corp Diaphragm and driver for a loudspeaker
CA1284837C (en) * 1987-06-18 1991-06-11 Highwood Audio Inc. Audio transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040003960A1 (en) * 2002-06-24 2004-01-08 Sawako Usuki Loudspeaker diaphragm
US6920957B2 (en) * 2002-06-24 2005-07-26 Matsushita Electric Industrial Co., Ltd. Loudspeaker diaphragm

Also Published As

Publication number Publication date
BE370732A (enrdf_load_html_response)
FR38677E (fr) 1931-06-26
GB344290A (en) 1931-03-05
FR692095A (fr) 1930-10-30
FR37934E (fr) 1931-02-07
FR38511E (fr) 1931-06-13
GB346205A (en) 1931-04-09
DE547840C (de) 1932-04-07
FR40003E (fr) 1932-03-21

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