US2502853A - Woven fabric diaphragm with stiffened portions - Google Patents

Woven fabric diaphragm with stiffened portions Download PDF

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Publication number
US2502853A
US2502853A US5991A US599148A US2502853A US 2502853 A US2502853 A US 2502853A US 5991 A US5991 A US 5991A US 599148 A US599148 A US 599148A US 2502853 A US2502853 A US 2502853A
Authority
US
United States
Prior art keywords
cone
diaphragm
woven fabric
surround
coil
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
US5991A
Other languages
English (en)
Inventor
Keddie James Edward
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2502853A publication Critical patent/US2502853A/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
    • 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
    • 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
    • H04R9/06—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
    • H04R2231/003—Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/021—Diaphragms comprising cellulose-like materials, e.g. wood, paper, linen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/023—Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/025—Diaphragms comprising polymeric materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/029—Diaphragms comprising fibres
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/204—Material aspects of the outer suspension of loudspeaker 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
    • H04R7/16—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
    • 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
    • H04R9/025—Magnetic circuit

Definitions

  • This invention relates to electro-acous'tic apparatus employing a diaphragm in the form of acone, such as cone loud-speakers, and "has more particular reference to the cone diaphragm and supporting surround in such apparatus.
  • the cone proper and the supporting surround are made from a continuous piece of woven fabric the threads of which are each constituted by anex- 'truded or drawn thread or by a plurality of extruded or'drawn filaments, the cone iproper being treated'so as to interlock the threads'of the "fabric to produce a substantially rigid'structure whereas the surround portion is left untreated so that the crossing "threads in the surround slide freely relatively to each other at each intersection point apart from the restraint imposed by adjacent threads.
  • the threads or filaments are'preferably of glass, but use may be made of other materials, such as synthetic plastics, yielding drawn or extruded filaments or threads exhibiting a smooth surface.
  • the interlocking of the threads is conveniently achieved by the application of a'binder or dope.
  • the untreated fabric surround in the rest position of the cone preferably takes the form of a toroidal surface which may be convex or concave as viewed looking on the open end of the cone, the'surface of the cone being'tangential to the toroidal surface.
  • the conical diaphragm may be supported in well-known manner by a spider engaging at the coil neck for example.
  • the spider is constructed in a manner analogous to the cone.
  • the loud-speaker comprises a rigid -framework or chassis i .to which the magnet assembly is secured-by means of bolts 1 and a clamping member 8.
  • the magnet assembly comprises a ring .2 surrounding a pole-piece 3, the annular gap between the ring 2 and the pole-piece 3 providing the magnetic field in which the speech call I 0 moves.
  • the pole-piece 3 is mounted on a permanent magnet 4 and is centered relatively to a pot 5 by means of a centering ring 5.
  • the coil I0 is wound on a coil former 9 by means of which the coil is secured to the loud-speaker cone H which has a cylindrical collar or neck 52 embracing the end of the coil former 9.
  • the glass fibre cloth is untreated and is given the shape of a part toroidal surface which is convex towards the open end of the cone, the cone being tangential to this curved surface at its inner extremity and the'rim M being tangential to it at its outer extremity.
  • the outer edge of the rim M is secured by embedding in a fixative in an annular trough l5 formed adjacent the outer periphery of the chassis l.
  • the fixative preferably has a solvent different from that of the binder used for doping the glass fabric as a similar solvent might soften the outer rim during the setting period.
  • the un" treated part it is a substantially part toroidal in the rest position, and on displacement of the cone l 5 under the action of the currents in the speech coil H) in the magnetic field, the shape of the part it varies but as the threads are free to slide relatively to one another there is no elastic deformation of the surround and energy dissipation in the surround is primarily frictional, provided that the range of movement of the cone lies within the capacity of the surround.
  • the limits thus imposed may readily be arranged to lie outside the largest movement required to cover the acoustic reproduction range for which the speaker is designed.
  • a flat type edge may be used in which event a gasket may be inserted between the chassis member and the rim of the cone, and the whole assembly of chassis member, gasket and rirn glued together.
  • the rigid central portion 16 is a substantially fiat disc and may be in the form of a spoked wheel as in conventional spider arrangements. According to the invention, the rigid central portion i6 is surrounded by a rolling undoped portion I8 serving the same function as the toroidal part I3 of the cone surround. The undoped portion 18 is followed by a marginal portion 19 which has been doped to render it rigid and is secured by fixative in an annular channel 20 adjacent the inner periphery of the chassis l.
  • the cone and the spider are first separately shaped and the appropriate parts are doped.
  • the pro-formed cone and the pre-formed spider are then associated with each other and with the speech coil to form an assembly which is fitted into the chassis, the outer edges of both cone and spider being cemented into the chantributed to the fact that normally almost all.
  • the transition phase may be very rapid and postulates the requirement that the cone assembly must follow accurately the frequency changes that occur. If the frequency change passes through a natural resonance frequency of the loudspeaker there will be a delay in the rising frequency response. quick rise to the sustained note.
  • the aural effect which results is a slurring of the commencement of the sound which is being reproduced. The clarity of reproduction is improved not only due to this absence of or diminution in the slurring effect, but also due to another property of the laud-speaker.
  • the cone assembly Considering the simple case of a high frequency note superimposed on a low frequency note if the loud-speaker has inertia at resonance frequency and if during reproduction of the low note the cone assembly has large movement and high velocity, then the small power change of the high note becomes smoothed out in the movement of the cone and is not reproduced in proportion to the input value.
  • the resistance surround cone assembly according to the present invention there is no stored inertia since the energy is dissipated in friction in the surround, so that the cone is always under electrical drive from the speech coil and any changes in the drive are reproduced in .the cone assembly. Consequently, the cone assembly according to the invention contributes to the input being followed to a more faithful degree than with cone loud-speakers of the freely suspended type.
  • An acoustic diaphragm device comprising a. diaphragm having a cone-shaped surface and a supporting surround integral therewith, said diaphragm and surround being of a continuous piece of a woven fabric, the portion of said woven fabric which forms said diaphragm being fixed by a binder while the portion of said woven fabric which forms said surround is untreated in a first annular region contiguous to said diaphragm but fixed by a binder in a second annular region remote from said diaphragm, said first annular region having in the normal rest position a toroidal surface which is convex in the direction towards the open end of said cone-shaped diaphragm, said cone-shaped surface of said dia- F phragm being tangential to said toroidal surface of said untreated annular region, a coil former attached to said diaphragm in the region of the apex thereof, and a supporting spider attached to said coil former, said spider comprising a second integral piece of said

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US5991A 1945-11-08 1948-02-03 Woven fabric diaphragm with stiffened portions Expired - Lifetime US2502853A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB29820/45A GB640824A (en) 1945-11-08 1945-11-08 Improvements in and relating to cone diaphragm electro-acoustic apparatus

Publications (1)

Publication Number Publication Date
US2502853A true US2502853A (en) 1950-04-04

Family

ID=10297703

Family Applications (1)

Application Number Title Priority Date Filing Date
US5991A Expired - Lifetime US2502853A (en) 1945-11-08 1948-02-03 Woven fabric diaphragm with stiffened portions

Country Status (5)

Country Link
US (1) US2502853A (zh)
BE (1) BE482081A (zh)
ES (1) ES181488A1 (zh)
FR (1) FR957982A (zh)
GB (1) GB640824A (zh)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2818130A (en) * 1953-04-13 1957-12-31 Whiteley Electrical Radio Comp Loudspeaker diaphragms
US2866515A (en) * 1955-11-28 1958-12-30 Robert C Hunter Cone for loud-speaker assembly
US2873813A (en) * 1955-07-27 1959-02-17 Hawley Products Co Acoustic diaphragm and method of construction
US3328537A (en) * 1964-01-09 1967-06-27 Hecht William High frequency sound translating device
US3364315A (en) * 1963-01-25 1968-01-16 Akg Akustische Kino Geraete Electronic appliance
US4100992A (en) * 1974-08-12 1978-07-18 Weber Louis Rehde Loudspeaker
US5744761A (en) * 1993-06-28 1998-04-28 Matsushita Electric Industrial Co., Ltd. Diaphragm-edge integral moldings for speakers and acoustic transducers comprising same
WO2008068349A1 (de) * 2006-12-08 2008-06-12 Sennheiser Electronic Gmbh & Co. Kg Elektroakustischer wandler
US20220345822A1 (en) * 2020-07-29 2022-10-27 Sotis AG Electrodynamic drive for flat loudspeaker systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2454824C2 (ru) * 2008-03-05 2012-06-27 Генелек Ой Составная динамическая головка громкоговорителя

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1729407A (en) * 1927-04-05 1929-09-24 Stevens Mfg Corp Acoustic diaphragm
US1843367A (en) * 1929-02-04 1932-02-02 Crosley Radio Corp Diaphragm
US2201059A (en) * 1937-12-14 1940-05-14 Philco Radio & Television Corp Loud-speaker
US2206517A (en) * 1938-04-06 1940-07-02 Fides Gmbh Electroacoustic apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1729407A (en) * 1927-04-05 1929-09-24 Stevens Mfg Corp Acoustic diaphragm
US1843367A (en) * 1929-02-04 1932-02-02 Crosley Radio Corp Diaphragm
US2201059A (en) * 1937-12-14 1940-05-14 Philco Radio & Television Corp Loud-speaker
US2206517A (en) * 1938-04-06 1940-07-02 Fides Gmbh Electroacoustic apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2818130A (en) * 1953-04-13 1957-12-31 Whiteley Electrical Radio Comp Loudspeaker diaphragms
US2873813A (en) * 1955-07-27 1959-02-17 Hawley Products Co Acoustic diaphragm and method of construction
US2866515A (en) * 1955-11-28 1958-12-30 Robert C Hunter Cone for loud-speaker assembly
US3364315A (en) * 1963-01-25 1968-01-16 Akg Akustische Kino Geraete Electronic appliance
US3328537A (en) * 1964-01-09 1967-06-27 Hecht William High frequency sound translating device
US4100992A (en) * 1974-08-12 1978-07-18 Weber Louis Rehde Loudspeaker
US6039145A (en) * 1993-06-28 2000-03-21 Matsushita Electric Industial Co., Ltd. Diaphragm-edge integral moldings for speakers, acoustic transducers comprising same and method for fabricating same
EP0942625A2 (en) * 1993-06-28 1999-09-15 Matsushita Electric Industrial Co., Ltd. Method for fabricating diaphragm-edge integral molding for speakers
US5744761A (en) * 1993-06-28 1998-04-28 Matsushita Electric Industrial Co., Ltd. Diaphragm-edge integral moldings for speakers and acoustic transducers comprising same
EP0942625A3 (en) * 1993-06-28 2002-05-15 Matsushita Electric Industrial Co., Ltd. Method for fabricating diaphragm-edge integral molding for speakers
WO2008068349A1 (de) * 2006-12-08 2008-06-12 Sennheiser Electronic Gmbh & Co. Kg Elektroakustischer wandler
US20110031061A1 (en) * 2006-12-08 2011-02-10 Sennheiser Electronic Gmbh & Co. Kg Electroacoustic Transducer
US8215445B2 (en) 2006-12-08 2012-07-10 Sennheiser Electronic Gmbh & Co. Kg Electroacoustic transducer
DE102006058369B4 (de) * 2006-12-08 2014-01-23 Sennheiser Electronic Gmbh & Co. Kg Elektroakustischer Wandler
US20220345822A1 (en) * 2020-07-29 2022-10-27 Sotis AG Electrodynamic drive for flat loudspeaker systems
US11683647B2 (en) * 2020-07-29 2023-06-20 Sotis AG Electrodynamic drive for flat loudspeaker systems

Also Published As

Publication number Publication date
ES181488A1 (es) 1948-07-01
FR957982A (zh) 1950-03-02
GB640824A (en) 1950-07-26
BE482081A (zh)

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