US1829355A - Acoustic diaphragm - Google Patents

Acoustic diaphragm Download PDF

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Publication number
US1829355A
US1829355A US471455A US47145530A US1829355A US 1829355 A US1829355 A US 1829355A US 471455 A US471455 A US 471455A US 47145530 A US47145530 A US 47145530A US 1829355 A US1829355 A US 1829355A
Authority
US
United States
Prior art keywords
cone
rim
corrugations
diaphragm
blank
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
US471455A
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English (en)
Inventor
Vernon T Houghton
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.)
LEKTOPHONE Corp
Original Assignee
LEKTOPHONE CORP
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
Priority to NL34823D priority Critical patent/NL34823C/xx
Application filed by LEKTOPHONE CORP filed Critical LEKTOPHONE CORP
Priority to US471455A priority patent/US1829355A/en
Priority to DEH126307D priority patent/DE595319C/de
Priority to FR717872D priority patent/FR717872A/fr
Priority to GB16165/31A priority patent/GB369476A/en
Application granted granted Critical
Publication of US1829355A publication Critical patent/US1829355A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands

Definitions

  • This invention relates to diaphragms for loudspeakers.
  • the type of loudspeaker diaphragm now most extensively used, comprises a cone, a
  • Another object of the invention is to provide a diaphragm having a cone and a substantially flat rim portion in which the cone has great freedom of motion in an axial di- 'rection, but is firmly supported in a radial direction.
  • a further object of the invention is to provide an improved method of making diaphragms having the foregoing characteristics.
  • Figure 2 is a side view of the diaphragm shown in Figure 1.
  • Figure 3 is a transverse section taken on the line 33 of Figure 4.
  • Figure 4c is an enlarged plan view of a small section of the diaphragm showing one set of corrugations that are formed in the edge of the cone and the adjoining portion of the rim.
  • Figures 5 and 6 are plan views of the paper blank showing the manner in which it is creased to provide for the subsequent bending of the paper or formation of the corrugations.
  • Figures 6 and 6 are fragmentary views of opposite sides of the paper blank, showing in full lines the creases that are placed on one side of the blank and in dotted lines the creases that are placed on the opposite side.
  • Figure 7 is a perspective view of a modified form of diaphragm constructed in accordance with the invention.
  • Figures 8 and 9 are plan views of the paper blank, showing the manner it; which the blank is creased on opposite sides to provide for the subsequent bending of the paper or formation of corrugations of the kind shown in Figure 7.
  • Figures 9 and 9 are fragmentary views of opposite sides of the blank, showing in full
  • a simple paper cone can readily be formed from a flat circular sheet of paper by cutting a sector from it and cementing together the radial edges of the sector.
  • My diaphragm may be considered as such a simple cone in which a certain amount of fullness is gathered in or taken up along a circumferential line corresponding with the line of juncture between the cone and the flexible rim in the finished diaphragm.
  • the diaphragm shown in Figures 1 to 4 inclusive it comprises a cone 1 and an integralrim portion 2 which is substantially flat, i. e., it lies in a plane extending. substantially at right angles to the axis of the cone.
  • the rim portion 2 although integral with the cone, assumes a flat condition, due to the provision of a series of radial corrugations 3 formed in the rim portion of the diaphragm. These corrugations are wider where the rim joins the cone and taper to a point and fade out toward the edge of the rim. Preferably they do not extend entakes place along the zigzag lines 9.
  • the edge portion of the cone 1 is provided with similar corrugations 4.
  • the corrugatlons 1n the cone are wider near the edge portion of the cone and preferably extend but a short distance up the walls of the cone where each one tapers to a point and fades out.
  • the corrugations 3 and 4 are preferably con'cave when viewed from the outside of the diaphragm.
  • each corrugation 5 is in line wlth and forms a continuation ofthe bottom bend or anti-crest 7 of the corrugation 4 and the bottom or anti-crest 8 of the corrugation 3, but the crest 6 forms an angle with the anti-crests 7 and 8 of the corrugations 4 and 3 when viewed from the side, as best shown in Figure 3.
  • the cone has considerable freedom of move- 1' ment in an axial direction.
  • the paper blank is first creased as shown in Figures 5 and 6, by suitable creasing dies or rollers.
  • the paper has a tendency to bend either in one direction or the other. It will be assumed that the dies used for creasing the blank are such that a crease in the outer surface of the diaphragm, as for instance,
  • one of the creases 7 will cause the adjacent surfaces to have a tendency to form an angle that is concave when viewed from the outer surface of the diaphragm, or in other words, to make the crease 7 an anti-crest.
  • One side of the blank should then be creased in the manner shown in Figure 5 to ultimately fo: m the anti-crests and bending lines 7 and 9.
  • the opposite side of the blank should be creased as shown in Figure C. to ultimately form the crests or bending lines (3 and 10.
  • Figures 6 and 6' show in full lines the creases on one side of the blank. and in dotted lines the creases on the opposite side.
  • a creased blank When a blank so creased is folded into cone shape, and the portion which ultimately forms the rim is bent up. the surfaces adjacent the creases may be moved by hand to their new positions to form the corrugations because the creasing imparts to the faces of the corrugations a strong tendency to assume those new positions. However. if it is desired to do this on a machine, a creased blank may be placed in a die press or passed between die rollers having male and female forn'iing surfaces to move the faces of the corrugations to their final desired posit ons. In either case there is a moving of the surfaces adjacent the creases to their new positions to form the corrugations within the meaning of the language of the method claims regardless of whether this is brought about by hand or by the use of machinery.
  • the preliminary creasing of the blank facilitates the formation of the corrugations.
  • the blank is preferably provided with a circular crease 11 where the corrugations 4 terminate to permit the walls of the cone to bend slightly at this crease, as best shown in Figures 1, 2 and 3.
  • corrugations 3 do not extend entirely to the outer edge of the rim portion 2, it is preferable to provide the rim with a radial split 12 at the end of each corrugation 3, as.
  • the modified form of diaphragm shown in Figures 7 to 11 inclusive has corrugations 3 provided in the rim, and corrugations 4 in the edge portion of the cone, these corrugations being similar to the corrugations 3 and 4 in the diaphragmdescribed above. excent that they are convex when viewed from the outer side of the diaphragm. They have crests l3 and anti-crests 14 where. their surfaces intersect the uncorrugated surface of the cone and the uncorrugated surfaceof the rim.
  • corrugations 8 are allowed to assume an angle with the corrugations 4', the manner in which the to more readily assume hinge action betweenthem is permitted, and the manner in which the corrugations 3 and 4 are permitted to expand andcontract when the cone vibrates, are taken care of in a different way from that shown in Figures 1 to 4.
  • the corrugation 15, corresponding with the corrugation 5 in Figures 1 to 4 is concave when viewed from the outer side of the diaphragm and has a bend or anti-crest 16 which extends circumferentially of the diaphragm.
  • the corrugation 15 is bounded by bends or crests 17 in such a way that the circumferential width at the base of the corrugation 15 is less than the circumferential width at the base of the corrugations 3 and 4. Extending down each wall of each corrugation 3 and 4' there is a bend or anti-crest 18. each of which extends from a point 19 where the lines 17 intersect the crests 13 to a point 20 where the line 14 of. the corrugation 3 meets the corresponding line 14 of the corrugation 4.
  • the surfaces at either side of each line 18 are con ave when viewed from the outer side of the diaphragm.
  • the line 18, together with the adjacent line 17, constitute two arms of a triangle, the base of which is formed by a bend or crest. 21.
  • the surfaces at either s de of the crest 21 are con vex when viewed from the outer side of the diaphragm.
  • the crests 21 are in alignment with the anti-crests 16 of the corrugations 15.
  • the lines that constitute crests are lines 13, 17 and 21.
  • the lines that constitute anticrests are lines 14, 16 and 18.
  • the corrugations 3 and 4 can expand and contract as the cone vibrates. During this expanding and contracting action, the points 20 approach and recede while the points 22 remain a fixed distance apart. This is accompanied by a slight bending or hinge lines 21 and the lines 18, in addition to the bending or hinge action that takes place along the crests 13 of the corrugations and along their anti-crests 14.
  • the diaphragm shown in Figures 7 to 11 inclusive may be made in the same way as the diaphragm of Figures 1 to that the paper may first be shaped into a cone and the corrugations pressed in the walls of the cone by suitable dies so that the diaphragm will assume the form shown in Figure 7, and if desired. this may be preceded by the creasing of the blank in the manner shown in Figures 8, 9, 9 and 9
  • the procedure of creasing the blank shown in these figures is the same as that described above in connection with Figures 6. (3 and 6. the only difference being that the creases are so arranged as to produce the different type of corrugations. As the propercreasing of the blanks produces a tendency for the surfaces of the corrugations to assume their final desired positions. and as the surfaces adjacent the creases may action along the lines 17, the
  • the armature is capable of a large amplitude of movement, as in an electrodynamic motor. hen such a motor is employed, the rim of the diaphragm should have great flexibility and the cone should be capable of a large amplitude of movement.
  • the advantage of allowing the edge portion of the cone and the inner edge portion of the rim to expand and contract asthe cone vibrates, will be more fully recognized when it is understood that a paper cone with a substantially flat paper rim is not capable of a large amplitude of movement, because every point on the inner circumference of the rim tends to swing in an arch of a circle which is convex with respect to the axis of the cone.
  • the cone In my diaphragm, the cone is always firmly supported in a radial direction in spite of the freedom with which the cone can move in an axial direction.
  • the cone In order to give an idea of how much movement the cone of my diaphragm is capable of, it might be stated that in a diaphragm having a cone whose basal diameter is about ten inches and a rim about an inch and a quarter wide, the cone may be moved about three-quarters of an inch but, of course, in operation it would never be required to move that distance. Throughout the movement of the cone the elastic restoring force of the rim remains nearly constant, this being a factor which aids in reducing distortion in the reproduction of sounds.
  • the invention seeks mainly to overcome the difficulties that have been encounteredwith diaphragms in which the cone is made of paper and in which the cone and also the rim are made of paper, and while the invention applies particularly to dia. phragms 'of that type, nevertheless the invention may be app-lied to diaphragms made of other materials where it is desired to give the diaphragms any advantage or characteristic which might be derived from the use of the invention herein disclosed.
  • a diaphragm constructed in accordance with this invention maybe made throughout of inexpensive material and manufactured at a small cost. It
  • i is well adapted for quantity production as the process of making it is simple and enables a large number of them to be manufactured in a short interval of time. Moreover, they are all substantially uniform as to their characteristics, which is not the case with diaphragms as now constructed.
  • An acoustic diaphragm comprising a conical portion made of paper, and a rim portion extending in a plane substantially at right angles to the axis of the conical portion, and means which renders the circumference of the base of the conical portion expansible and contractible.
  • An acoustic diaphragm comprising a conical portion and an integral rim portion both made of paper, means which renders the circumference of the base of the conical portion expansible and contractible, and means which renders the inner circumference of the rim portionlexpansihle and contractible.
  • An acoustic diaphragm comprising a conical portion and a supporting portion at the edge of the conical portion.
  • the conical portion being provided with radial corrugations permitting the cirgumference of the base of the conical portion to expand and contract, and means associated with said supporting portion to permit such expansion and contraction;
  • An acoustic diaphragm comprising a conical portion and a rim portion extending in a plane substantially at right angles to the axis of the conical portion, the conical portion having corrugations that are wider near the rim portion than towards the apex of the conical portion, and the rim portion having corrugations that are wider near the inner circumference of the rim portion than towards the outer circumference of the rim portion.
  • An acoustic diaphragm comprising a conical portion and a rim portion extending in a plane substantially at right angles to the axis of the conical portion, the conical portion having corrugations that are deeper near the rim portion than towards the apex of the conical portion, and .the rim portion having corrugations that are deeper near the inner circumference of the rim portion than towards the outer circumference of the rim portion.
  • An acoustic diaphragm comprising a conical portion and an integral rim portion extending in a plane substantially at right angles to the axis of the conical portion, each of said portions having tapering corrugations that are wider at the juncture between the conical and rim portions and fade out at points remote from said uncture.
  • An acoustic diaphragm comprising a conical portion and an integral rim portion extending in a plane substantially at right angles to the axis of the conical portion.
  • the conical portion having corrugations extcnding towards its juncture with the rim portion, and the rim portion also having corrugations extending toward said juncture, each corrugation of the conical portion meeting a corrugation of the rim portion, there being an additional corrugation interposed between each corrugation of the each adjoinin corrugation of the rim portion to permit the rim to assume its angle with the walls of'the conical portion and to permit a hinge action between the conical portion and the rim portion.
  • An acoustic diaphragm comprising a conical portion and a rim portion extending in a plane substantially at right angles to the axis of the conical portion, the conical portion "having corrugations extending towards its juncture with the rim portion, and the rim portion also having corrugations extending towards said juncture,'each corrugation of the conical portion meeting -'a""corrugation of the rim portion, means hereby the corrugations of each pair may assume an angle corresponding with the angle between the walls ot' the conical portion and the rim portion and said means permitting a hinge action between the corrugations of said pair. 12.
  • An acoustic diaphragm comprising a conical portion and a rim portion extending in a plane substantially at right angles to the axis of the conical portion, the conical portion having corrugations extending towards its juncture with the rim portion, and the rim 5 portion also having corrugations extending conical portion andtowards said juncture, each corrugation of the conical portion meeting a corrugation of the rim portion, and means to permit expansion and contraction of the corrugations.
  • the method of making an acoustic diaphragm of the cone and flat rim type which comprises forming a flat sheet of material into a simple cone and then gathering in the fullness along a line that corresponds with the line of juncture of the conical and rim portions of the finished diaphragm so that the amount of fullness gathered in is greatest along said line and progressively decreases towards the apex of the conical portion and towards the edge of the diaphragm whereby a marginal portion of the diaphragm can assume a substantially flat position to constitute the rim portion of the finished diaphragmw 14.
  • the method of making an acoustic diaphragm which comprises creasing a flat blank, forming the blank into a cone, and moving the surfaces adjacent said creases to new positions to form corrugations in thediaphragm whose bends correspond with the creases in the blank.
  • An acoustic diaphragm comprising a cone, an annular rim, and means which renders the circumference of the base of the cone expansible and contractible.
  • An acoustic diaphragm comprising a cone, an annular rim, and means which renders the inner circumference of the rim expansible and contractible.
  • the step which comprises gathering in the material of the diaphragm along a line that corresponds with the line of juncture of the conical and rim portions of the finished diaphragm so that thenmount of material gath ered in is greatest along said line and pro-

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
US471455A 1930-07-29 1930-07-29 Acoustic diaphragm Expired - Lifetime US1829355A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL34823D NL34823C (enrdf_load_stackoverflow) 1930-07-29
US471455A US1829355A (en) 1930-07-29 1930-07-29 Acoustic diaphragm
DEH126307D DE595319C (de) 1930-07-29 1931-04-08 Papiermembran fuer Lautsprecher usw., die aus einem mittleren Konusteil und einem daran anschliessenden, sich zur Konusachse nahezu rechtwinklig erstreckendem flachen Aussenteil besteht
FR717872D FR717872A (fr) 1930-07-29 1931-05-28 Pavillon acoustique pour diffuseurs
GB16165/31A GB369476A (en) 1930-07-29 1931-06-04 Acoustic diaphragm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US471455A US1829355A (en) 1930-07-29 1930-07-29 Acoustic diaphragm

Publications (1)

Publication Number Publication Date
US1829355A true US1829355A (en) 1931-10-27

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US471455A Expired - Lifetime US1829355A (en) 1930-07-29 1930-07-29 Acoustic diaphragm

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US (1) US1829355A (enrdf_load_stackoverflow)
DE (1) DE595319C (enrdf_load_stackoverflow)
FR (1) FR717872A (enrdf_load_stackoverflow)
GB (1) GB369476A (enrdf_load_stackoverflow)
NL (1) NL34823C (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681390A (en) * 1951-01-23 1954-06-15 Rola Company Inc Diaphragm for loud speakers
US2815823A (en) * 1953-03-02 1957-12-10 Rca Corp Loudspeaker structure
US2923371A (en) * 1957-10-28 1960-02-02 Harold L Otto Speaker
US3563337A (en) * 1968-03-06 1971-02-16 Hitachi Ltd Electroacoustic transducer
USD244698S (en) * 1976-03-03 1977-06-14 Babbco, Ltd. Loudspeaker cone
DE3037161A1 (de) * 1979-10-01 1981-04-09 James B. Lansing Sound of Delaware Inc., Chicago, Ill. Aufhaengung fuer eine akustische membran
US4655316A (en) * 1985-03-13 1987-04-07 Jbl Incorporated Acoustic diaphragm
US5748759A (en) * 1995-04-05 1998-05-05 Carver Corporation Loud speaker structure
US6041129A (en) * 1991-01-17 2000-03-21 Adelman; Roger A. Hearing apparatus
US6567529B1 (en) * 2000-12-29 2003-05-20 Mitek Corporation Low frequency loudspeaker driver having a polygonal diaphragm and method for mounting drivers in a tightly packed two-dimensional array
US8397861B1 (en) * 2012-03-02 2013-03-19 Bose Corporation Diaphragm surround
USD769215S1 (en) * 2014-07-15 2016-10-18 Funktion One Research Loudspeaker
USD780158S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
USD780159S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
US20180242086A1 (en) * 2017-02-22 2018-08-23 Gp Acoustics (Uk) Limited Loudspeaker driver surround
USD865719S1 (en) * 2017-10-13 2019-11-05 Alpine Electronics, Inc. Speaker
USD881846S1 (en) * 2017-12-06 2020-04-21 Tymphany Acoustic Technology (Huizhou) Co., Ltd. Vibration diaphragm for loudspeaker

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5613897A (en) * 1979-07-13 1981-02-10 Toshiba Corp Supporting device for ring-shaped diaphragm
FR2490913B1 (fr) * 1980-08-09 1985-06-14 Matsushita Electric Ind Co Ltd Haut-parleur electrodynamique
DE10058274A1 (de) * 2000-11-23 2002-05-29 Alfa Laval Flow Gmbh Membran mit strukturierter Oberfläche
GB2374753B (en) 2001-01-29 2004-12-22 Goodmans Loudspeakers Ltd Loudspeaker suspension
DE102008042600B4 (de) * 2008-10-02 2020-09-17 Rolf Wissner Abdichtvorrichtung mit einer längs einer Hauptfläche verformbaren flexiblen Membran

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681390A (en) * 1951-01-23 1954-06-15 Rola Company Inc Diaphragm for loud speakers
US2815823A (en) * 1953-03-02 1957-12-10 Rca Corp Loudspeaker structure
US2923371A (en) * 1957-10-28 1960-02-02 Harold L Otto Speaker
US3563337A (en) * 1968-03-06 1971-02-16 Hitachi Ltd Electroacoustic transducer
USD244698S (en) * 1976-03-03 1977-06-14 Babbco, Ltd. Loudspeaker cone
US4324312A (en) * 1978-11-14 1982-04-13 James B. Lansing Sound, Inc. Diaphragm suspension construction
DE3037161A1 (de) * 1979-10-01 1981-04-09 James B. Lansing Sound of Delaware Inc., Chicago, Ill. Aufhaengung fuer eine akustische membran
US4655316A (en) * 1985-03-13 1987-04-07 Jbl Incorporated Acoustic diaphragm
US6041129A (en) * 1991-01-17 2000-03-21 Adelman; Roger A. Hearing apparatus
US5748759A (en) * 1995-04-05 1998-05-05 Carver Corporation Loud speaker structure
US6567529B1 (en) * 2000-12-29 2003-05-20 Mitek Corporation Low frequency loudspeaker driver having a polygonal diaphragm and method for mounting drivers in a tightly packed two-dimensional array
US8397861B1 (en) * 2012-03-02 2013-03-19 Bose Corporation Diaphragm surround
WO2013130520A1 (en) * 2012-03-02 2013-09-06 Bose Corporation Diaphragm surround
USD769215S1 (en) * 2014-07-15 2016-10-18 Funktion One Research Loudspeaker
USD780158S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
USD780159S1 (en) * 2014-07-15 2017-02-28 Funktion One Research Loudspeaker
US20180242086A1 (en) * 2017-02-22 2018-08-23 Gp Acoustics (Uk) Limited Loudspeaker driver surround
US10771901B2 (en) * 2017-02-22 2020-09-08 Gp Acoustics (Uk) Limited Loudspeaker driver surround
USD865719S1 (en) * 2017-10-13 2019-11-05 Alpine Electronics, Inc. Speaker
USD881846S1 (en) * 2017-12-06 2020-04-21 Tymphany Acoustic Technology (Huizhou) Co., Ltd. Vibration diaphragm for loudspeaker

Also Published As

Publication number Publication date
NL34823C (enrdf_load_stackoverflow)
DE595319C (de) 1934-04-11
FR717872A (fr) 1932-01-15
GB369476A (en) 1932-03-24

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