US3804994A - Diaphragm support - Google Patents

Diaphragm support Download PDF

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Publication number
US3804994A
US3804994A US00279913A US27991372A US3804994A US 3804994 A US3804994 A US 3804994A US 00279913 A US00279913 A US 00279913A US 27991372 A US27991372 A US 27991372A US 3804994 A US3804994 A US 3804994A
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US
United States
Prior art keywords
diaphragm
threads
speaker
yoke
voice 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
US00279913A
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English (en)
Inventor
T Turuga
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.)
Individual
Original Assignee
Individual
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 claimed from JP6912271A external-priority patent/JPS5245216B2/ja
Priority claimed from JP8112471U external-priority patent/JPS512601Y2/ja
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3804994A publication Critical patent/US3804994A/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
    • H04R9/041—Centering
    • H04R9/042—Centering by pressurised air
    • 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

  • the present invention relates to a speaker, particularly to a speaker which is improved in the means which supports the rear part adjacent to the voice-coil of a diaphragm and/or the front part of a diaphragm.
  • a diaphragm of a speaker must be supported as loosely as possible, thereby to reduce stiffness.
  • the diaphragm is supported too loosely, it permits a swaying motion and warping, or after many years it may slip down from the correct point in a gap of magnetic circuit, causing a voice-coil of the diaphragm to make contact with the magnet in the magnetic circuit thereby producing an abnormal tone;
  • the supporter keeping the rear part of the diaphragm centered around the voice-coil generally used is a damper of concentric circular wave shape made of.
  • the support around the front part in the speaker diaphragm functions as helping the diaphragm to vibrate correctly and therefore exerts influences upon the distortion characteristics and the low frequency characteristics, which heretofore have had a bad effect by reflected waves or the like from the sup port around front part of the diaphragm, especially there are caused mountains and valleys easily in the characteristics in a medium frequency region.
  • the diaphragm is supported rigidly, resonance frequency in the low region becomes high and efficiency in regeneration of the low frequency becomes low, therefore free edge is used to have high flexibility and the-edge is made of deerskin or the like which is very flexible and is excellent for inner dissipation. Consequently the diaphragm must be supported loosely and stiffness must be reduced. However, if the diaphragm is supported too loosely, it brings about a swing motion to warp, or after many years, it may slip down from the correct point to cause abnormal tone.
  • the present invention avoids said defects. It is an object of the present invention to provide an improved speaker support means which may keep the diaphragm, that is the voice-coil of the diaphragm in the correct point in a gap of the magnetic circuit by electromagnetic power of voice-coil when the speaker is used, by hanging rear part of the diaphragm near the voice-coil in a balanced condition or by hanging front part of the diaphragm by means of a fulcrum ring through threads, keeping balance by means of springs.
  • a speaker comprising a rear support means having some threads provided near voice-coil at the rear part of a diaphragm, a ring connected to each end of said threads and disposed in space around said diaphragm, and some fulcrums mounted outside of yoke of the speaker to support said threads, and/or a front support means having some threads one end of which is fixed around the front part of the diaphragm and to whose other ends springs are fixed, a ring secured on the yoke of the speaker to secure each end of said springs, a fulcrum ring which is connected to said ring in a concentric way to support said threads and is consequently secured to said yoke.
  • a speaker provided with the rear support means of the present invention when voice-coil is kept in the correct position in a gap of the magnetic circuit, the po sition of the voice-coil is not changed as long as that balance is kept. However, after many years, that balance may be changed, or the position of the voice-coil may be changed by external force. Even if these changes may occur, the voice-coil actually moves to the center in the gap of the magnetic circuit, that is, it may adjust itself when it is constructed according to the present invention. Accordingly, there is no trouble for utilizing this speaker in spite of changes after many years. Therefore, when the rear support means of this invention is utilized, it is not necessary to closely control strain of the thread as in the past.
  • the voice-coil since it is not necessary to draw thread tightly, stiffness may be reduced. Further since the voice-coil is kept in a condition in which the voice-coil may be moved by a little force, it always vibrates at the safest position by the action of electro-magnetic force. Accordingly vibration of the diaphragm is not restrained so that good quality of tone with very little distortion may be obtained and the lowest resonance frequency may be sufficiently lowered and also transient characteristics may be distinguished.
  • FIG. 1 is a sectional view which shows the first preferred form of embodiment of the speaker according to the present invention
  • FIG. 2 is afragmental perspective view of the speaker shown in FIG. 1;
  • FIG. 3 is a sectional view which shows the second preferred form of embodiment of the speaker according to the present invention.
  • FIG. 4 is a'front view of the speaker shown in FIG. 3;
  • FIG. 5 is a sectional view which shows the third preferred form of embodiment of the speaker according to the present invention.
  • reference number 1 is a diaphragm, around the central rear part la whereof voice-coil 2 is adhered. Near the voice-coil of the diaphragm some threads 3 secured, the rear part of the diaphragm l is hung by a ring weight 5 which is kept in balance by some fulcrums 4 provided respectively on supporting studs 9a fixed around yoke 9 through the threads 3.
  • the diaphragm is inserted into a gap 6 of magnetic circuit formed by a magnetic pole 10.
  • the threads 3, the fulcrums 4, the ring weight 5 form the rear support means A as a whole.
  • the voice-coil 2 may be moved freely in any direction by a little force, the voice-coil 2 may be supported at any position in the gap of the magnetic circuit.
  • the size of the fulcrums is chosen so that the threads 3 do not touch to the ring weight 5 during axial vibration of the diaphragm I.
  • the fulcrums are preferably shaped as rollers and are provided with bezel on the circumference thereof to support threads 3. It will of course be understood that the fulcrums may be fixed or rotatably supported on the supporting studs 9a respectively.
  • reference number 1 is a diaphragm as shown in said first embodiment, at its central rear part la a voice-coil 2 is adhered. Also the voice coil 2 is supported by usual damper and inserted into a gap of magnetic circuit.
  • the front part 7 of the diaphragm l is adhered to yoke 9 through free edge 8.
  • the front support means B is provided so as to support the front part of the diaphragm l, and is mainly formed by threads 14, springs 11, supporting rods 13, a medium ring 12 and a fulcrum ring 15.
  • One end of the threads 14 is connected to the circumferential part 7 of the diaphragm l and the threads are passed through the fulcrum ring 15 of the supporting rod 13 and also are connected with each spring 11 connected to the medium ring 12 secured on the supporting rod 13 at the other end.
  • the front part 7 of the diaphragm l is hung on the fulcrum ring 15 through the threads 14 drawn by the springs 11 so as to support the diaphragm.
  • the strength of the springs 11 connected with the threads 14 is chosen so that the diaphragm 1 does not deform, and it is sufficient that the standstill frictional force working between the threads 14 and the supporting ring 15 may support the weight of the diaphragm 1. It is preferred that four threads 14 and four fulcrums 11 are used, so the diaphragm is supported in four directions.
  • the free edge 8 is not necessary to support the diaphragm I, therefore the part which is supported by yoke 9 may be formed very pliantly, also it is possible for edge 8 to be perfectly free.
  • the front support means B is secured to the yoke 9 by means of the supporting rods 13 as illustrated, the means B may be secured to a stud (not illustrated) mounted on the magnetic pole.
  • FIG. 5 is a sectional view which shows the third form of the speaker according to the present invention.
  • This embodiment is a form added the front support means B applied in the second embodiment to the rear support means A applied in the first embodiment and this construction may contain all the effects which come from said first and second preferred forms of embodiments. Namely the rear part 1a of the diaphragm I near the voice-coil 2 is kept balanced by the rear support means A comprising the threads 3, the fulcrums 4, and the weight 5. Further the front part 7 of the diaphragm l is kept in balance by the front support means B namely the threads 14, the springs 11, the supporting rods 13, the medium ring 12 and the fulcrum ring 15.
  • the improved means for supporting said diaphragm in balance in the proper position in a gap of the magnetic circuit which includes said voice coil comprising:
  • the improved means for supporting said diaphragm in balance in the proper position in a gap of the magnetic circuit which includes said voice coil comprising:
  • a fulcrum ring provided concentrically to said medium ring and fixed to said yoke, each of said threads passing through said fulcrum ring between the ends of said threads;
  • the improved means for supporting said diaphragm in balance in the proper position in a gap of the magnetic circuit which includes said voice coil comprising:
  • front support means to support the front part of said diaphragm
  • said rear support means includes a plurality of individual threads each connected to the rear part of said diaphragm, near said voice coil;
  • said front support means includes:
  • a fulcrum ring provided concentrically to said medium ring and fixed to said yoke, each of said threads passing through said fulcrum ring between the ends of said threads;

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US00279913A 1971-09-07 1972-08-11 Diaphragm support Expired - Lifetime US3804994A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6912271A JPS5245216B2 (enrdf_load_stackoverflow) 1971-09-07 1971-09-07
JP8112471U JPS512601Y2 (enrdf_load_stackoverflow) 1971-09-07 1971-09-07

Publications (1)

Publication Number Publication Date
US3804994A true US3804994A (en) 1974-04-16

Family

ID=26410307

Family Applications (1)

Application Number Title Priority Date Filing Date
US00279913A Expired - Lifetime US3804994A (en) 1971-09-07 1972-08-11 Diaphragm support

Country Status (4)

Country Link
US (1) US3804994A (enrdf_load_stackoverflow)
DE (1) DE2243745A1 (enrdf_load_stackoverflow)
FR (1) FR2152746B1 (enrdf_load_stackoverflow)
GB (1) GB1402180A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50142431U (enrdf_load_stackoverflow) * 1974-05-14 1975-11-25
US6422337B1 (en) * 2000-06-28 2002-07-23 Deccon International Ltd. Loudspeaker with a suspension member made of a laminate
RU2582158C2 (ru) * 2013-10-16 2016-04-20 Александр Васильевич Дегтярев Громкоговоритель.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613609A (en) * 1923-06-05 1927-01-11 Western Electric Co Acoustic device
GB320647A (en) * 1928-07-18 1929-10-18 Frederick William Lanchester Improvements in moving coil loud speakers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613609A (en) * 1923-06-05 1927-01-11 Western Electric Co Acoustic device
GB320647A (en) * 1928-07-18 1929-10-18 Frederick William Lanchester Improvements in moving coil loud speakers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50142431U (enrdf_load_stackoverflow) * 1974-05-14 1975-11-25
US6422337B1 (en) * 2000-06-28 2002-07-23 Deccon International Ltd. Loudspeaker with a suspension member made of a laminate
RU2582158C2 (ru) * 2013-10-16 2016-04-20 Александр Васильевич Дегтярев Громкоговоритель.

Also Published As

Publication number Publication date
FR2152746B1 (enrdf_load_stackoverflow) 1978-07-07
DE2243745A1 (de) 1973-03-15
GB1402180A (en) 1975-08-06
FR2152746A1 (enrdf_load_stackoverflow) 1973-04-27

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