US3483946A - Loudspeaker - Google Patents

Loudspeaker Download PDF

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Publication number
US3483946A
US3483946A US786992A US3483946DA US3483946A US 3483946 A US3483946 A US 3483946A US 786992 A US786992 A US 786992A US 3483946D A US3483946D A US 3483946DA US 3483946 A US3483946 A US 3483946A
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US
United States
Prior art keywords
diaphragm
periphery
asymmetric
loudspeaker
conical
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
US786992A
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English (en)
Inventor
Hiromi Sotome
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.)
Nippon Gakki Co Ltd
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Nippon Gakki Co Ltd
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Filing date
Publication date
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Application granted granted Critical
Publication of US3483946A publication Critical patent/US3483946A/en
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Expired - Lifetime legal-status Critical Current

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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

  • a loudspeaker including a diaphragm made of substantially fiat plate of plastic, foamed plastic or the like material which is clamped at'its periphery on a speaker frame so as to produce sounds by bending motion of said diaphragm, characterized in that said diaphragm is formed to have an asymmetric contour at its periphery as seen from its front side and a conical configuration at its central driven portion, said conical configuration being formed in an asymmetric shape corresponding to the asymmetric contour of the periphery of the diaphragm.
  • the present invention relates to a loudspeaker of the type including a diaphragm made of a substantially flat plate of plastic, foamed plastic such as foamed polystyrene or the like material which is clamped at its periphery on a speaker frame so as to produce sounds by bending motion of said diaphragm.
  • the diaphragm of the above type tends to produce divided vibrations, so that excessive resonance may occur at particular frequencies, resulting turbulence in frequency characteristics of the loudspeaker.
  • the diaphragm having an asymmetric contour at its periphery as seen from its front side and a conical shape at its central driven portion as seen in section has been proposed, which has obtained an improvement in frequency characteristics as compared with the conventional loudspeaker having flat-plate type diaphragm.
  • a loudspeaker including a diaphragm made of substantially flat plate clamped at its periphery on a speaker frame so as to produce sounds by bending motion of said diaphragm, said diaphragm 'being formed to have an asymmetric contour at its periphery as seen from its front side and a conical configuration at its central driven portion, said conical configuration being formed in an asymmetric form correspoding to the asymmetric contour of the periphery of the diaphragm.
  • FIG. 1 is a front view showing an example of a loud speaker according to a prior art
  • FIG. 2 is a sectional view taken along line IIII in FIG. 1;
  • FIG. 3 is a front view showing an embodiment of the present invention.
  • FIG. 4 is a sectional view taken along line IV1V in FIG. 3.
  • FIGS. 1 and 2 show an example of a loudspeaker according to a prior art, which comprises a substantially fiat diaphragm 1 made of foamed polystyrene or the like material, a speaker frame 2, a magnetic circuit 3 and a voice coil 4, said diaphragm 1 being clamped at its periphery on said speaker frame 2 by a suitable means such as adhesive agent.
  • the diaphragm 1 is formed in an asymmetric contour at its periphery as seen from front side thereof and in a conical configuration at its central portion 5 which is to be driven by the voice coil 4.
  • said conical portion 5 in a circular or elliptical symmetric form, as shown by contour lines 6 in FIG. 1.
  • a flat portion exists between the periphery of the diaphragm and the outer end 7 of the conical portion 5. Since the diaphragm is formed in an asymmetric contour at its periphery, a relatively large flat portion is formed in the direction of larger radius of the diaphragm, as shown by circular broken lines 8 in FIG. 1.
  • Such portion has a reduced flexural rigidity, so that an undesirable divided vibration can occur, thus producing excessive peaks and dips in the frequency characteristics particularly in the intermediate and low frequency ranges.
  • FIGS. 3 and 4 illustrate an embodiment of the present invention, which comprises a diaphragm 11 made of foamed polystyrene or the like material, a speaker frame 12, a magnetic circuit 13 and a voice coil 14, said diaphragm 11 being clamped at its periphery on the frame 12 by suitable means, such as adhesive agent.
  • the diaphragm 11 is formed in an asymmetric contour at its periphery as seen from its front side and in a conical configuration at its central portion 15 which is to be driven by the voice coil 14.
  • the conical portion 15 is formed in an asymmetric form corresponding to the asymmetric contour corresponding to the asymmetric shape of the periphery of the diaphragm, as shown by contour lines 16 in FIG. 3.
  • a flat portion of substantially uniform width is formed between the periphery of the diaphragm and the outer end 17 of the conical portion 15 according to the asymmetric contour of the periphery of the diaphragm, and a large flat portion such as shown by broken lines 8 in FIG. 1 is not formed at any part of the diaphragm. Accordingly a remarkable improvement can be obtained in the frequency characteristics.
  • a loudspeaker including a diaphragm made of substantially fiat plate clamped at its periphery on a speaker frame so as to produce sounds by bending motion of said diaphragm, said diaphragm being formed to have an asymmetric contour at its periphery as seen from its front side and a conical configuration at its central driven portion, said conical configuration being formed in an a l, Q43 v asymmetric form corresponding to the asymmetric contour of the periphery of the diaphragm.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
US786992A 1967-12-30 1968-12-26 Loudspeaker Expired - Lifetime US3483946A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11074567 1967-12-30

Publications (1)

Publication Number Publication Date
US3483946A true US3483946A (en) 1969-12-16

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ID=14543447

Family Applications (1)

Application Number Title Priority Date Filing Date
US786992A Expired - Lifetime US3483946A (en) 1967-12-30 1968-12-26 Loudspeaker

Country Status (3)

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US (1) US3483946A (de)
DE (1) DE1817432C3 (de)
GB (1) GB1250640A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596733A (en) * 1968-12-30 1971-08-03 Jose Juan Bertagni Flat diaphragm for sound transducers and method for manufacturing it
US20040125980A1 (en) * 2002-12-31 2004-07-01 Turnmire Patrick M. Electromagnetic transducer with asymmetric diaphragm

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3111189A (en) * 1962-01-12 1963-11-19 Theodore R Scholl Electrodynamic loudspeaker
US3172498A (en) * 1961-10-04 1965-03-09 Akg Akustische Kino Geraete Foamed plastic diaphragm for sound transducers
US3180945A (en) * 1961-09-22 1965-04-27 Wm H Welsh Co Inc Loudspeaker
US3247925A (en) * 1962-03-08 1966-04-26 Lord Corp Loudspeaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3180945A (en) * 1961-09-22 1965-04-27 Wm H Welsh Co Inc Loudspeaker
US3172498A (en) * 1961-10-04 1965-03-09 Akg Akustische Kino Geraete Foamed plastic diaphragm for sound transducers
US3111189A (en) * 1962-01-12 1963-11-19 Theodore R Scholl Electrodynamic loudspeaker
US3247925A (en) * 1962-03-08 1966-04-26 Lord Corp Loudspeaker

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596733A (en) * 1968-12-30 1971-08-03 Jose Juan Bertagni Flat diaphragm for sound transducers and method for manufacturing it
US20040125980A1 (en) * 2002-12-31 2004-07-01 Turnmire Patrick M. Electromagnetic transducer with asymmetric diaphragm
US20050105757A1 (en) * 2002-12-31 2005-05-19 Tummire Patrick M. Electromagnetic transducer with eccentrically mounted voice coil former
US7177440B2 (en) * 2002-12-31 2007-02-13 Step Technologies Inc. Electromagnetic transducer with asymmetric diaphragm
US7233681B2 (en) * 2002-12-31 2007-06-19 Step Technologies, Inc. Electromagnetic transducer with eccentrically mounted voice coil former

Also Published As

Publication number Publication date
DE1817432A1 (de) 1969-07-10
DE1817432B2 (de) 1973-05-10
GB1250640A (de) 1971-10-20
DE1817432C3 (de) 1973-11-22

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