WO2002009472A1 - Integral diaphragm with amplified mechanical resonance - Google Patents

Integral diaphragm with amplified mechanical resonance Download PDF

Info

Publication number
WO2002009472A1
WO2002009472A1 PCT/FR2001/002415 FR0102415W WO0209472A1 WO 2002009472 A1 WO2002009472 A1 WO 2002009472A1 FR 0102415 W FR0102415 W FR 0102415W WO 0209472 A1 WO0209472 A1 WO 0209472A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
magnet
sound
diaphragm
soundboard
Prior art date
Application number
PCT/FR2001/002415
Other languages
French (fr)
Inventor
Laurent Coudert
Pierre Piccaluga
Original Assignee
Laurent Coudert
Pierre Piccaluga
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 FR0009650A priority Critical patent/FR2812165B1/en
Priority to FR00/09650 priority
Application filed by Laurent Coudert, Pierre Piccaluga filed Critical Laurent Coudert
Publication of WO2002009472A1 publication Critical patent/WO2002009472A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12Non-planar diaphragms or cones

Abstract

It is common in the field of sound production and sound reproduction, to use in particular electroacoustic diaphragm or tape transducers. The electroacoustic diaphragm transducer is characterised by its magnet and its coil which interact freely and independently, in ambient air according to audio electric pulses. The magnet and the electric coil have movements bound by electromagnetic forces which are propagated in the air. The relative movements are free and determine displacements with an amplitude specific to each electroacoustic transducer. The invention proposes to eliminate the free aerial movement of the diaphragms by integrating the diaphragm directly linked with its coil to the magnet provided with its speaker frame. The method consists in maintaining a certain elasticity of movement between the components, which consist in the magnet and the coil which receives the audio signal, whether analog or digital. Another embodiment of the method consists in eliminating the usual speaker diaphragm and replace said diaphragm with at least a soundboard with concave or convex shape or both, which provides it with vibrating properties. Thus, the novel method determines a novel sound transmission mode generated along three orthnormal axes. Figure (1) represents a sound reproduction apparatus, the coil coupled to its magnet (4) by an elastic link. The inventive method and its appliances are useful in the field of sound production and reproduction, as well as in the audio-visual field.

Description


  



   SOLIDARITY MEMBRANE WITH MECHANICAL RESONANCE
AMPLIFIEE
It is known in the world of sound production and sound reproduction, to make use in particular of electroacoustic membrane or ribbon transducers.



  The electroacoustic diaphragm transducer is characterized by its magnet and its coil which interact in a free and independent way, with the ambient air according to the audio electrical impulses.



  The magnet and the electric coil have movements linked by the electromagnetic forces which propagate in the air, and which allows the relative movement on the one hand of the acoustic membrane integral with its coil and on the other hand the magnet integral tied to the salad bowl. The relative movements are free and determine deflections of an amplitude specific to each electroacoustic transducer. These deflections can vary from a few millimeters to more or less a centimeter approximately, depending on the suspension of the membrane. These deflections of the membrane are made perpendicular to a single axis of translation.



  The present invention proposes to eliminate the free, air travel of the membranes by making the membrane linked directly with its winding to the magnet provided with its bowl. The integral connection can be made for example by an elastic structure whose shore hardness can be extremely small and in certain relatively hard applications around 40-45 shore hardness. The method is to maintain a certain elasticity of movement between the components, which are the magnet and the coil which receives the audio signal, analog or digital. Indeed, the elasticity makes it possible to induce a vibration expressed by the induced electromagnetic forces which activate the relative movement of the various components.

   The transfer of the kinetic energy of the sound vibrations is reflected by at least one elastic connection on the various components, including in particular on the membrane which determines a new mode of sound emission by mechanical amplification of elastic or semi-elastic connection. The elastically connected components constitute a new electroacoustic transducer.



  A variant of the present method consists in eliminating the usual diaphragm of the loudspeaker, the conicity of which tends to make the diaphragm rigid without deformation, and to substitute for this diaphragm at least one soundboard whose convex or concave shape or both times, gives it additional elastic deformation properties. This transfer of vibration to an elastically deformable volume improves the sound rendering by the transfer of sound vibrations around the periphery of the entire membrane, with different amplitudes depending on the shape and thickness of the soundboard. .

   The present method thus determines a new mode of sound emission generated on three orthonormal axes, by the dissipation of three-dimensional sound vibrations on a vibrating volume, due to the compliance of the material or materials, for example wood, or metal or polymer which constitute the soundboard.



  The present method is characterized by the installation of at least one elastic connection between the motor and its membrane or at least one soundboard. The elastic connections eliminate the deflections of ample mechanical amplitude, of the membranes which are useless. Indeed on violins and double basses all the connections are fixed or semi-rigid and the sound vibrations are created by the simple fact of the compliance of the materials. The present process and its devices therefore comply with the principle of sound generation of the instruments, or all of the harmonics succeed one another by the natural amplification of the deformations of the components of the soundboard formed according to at least one open volume or closed, vibrating which can also be twisted in a helical shape.



  The present process with different production devices, including two non-exhaustive examples made by those skilled in the art shows the possible applications.



  Figure (1) shows a sound reproduction device electrically powered by an audio audio signal, by the wires (1) supplying the electric coil of the motor (2), integral with its soundboard (3), the coupled coil to its magnet (4) by an elastic connection, for example made of elastomer, latex or shore hardness rubber 30 (5).



  The tensioners, for example in fine braided rope (6) are fixed on the one hand to the magnet on the other hand to the soundboard whose tension is adjustable by screws with eyelets (7) allow the acoustic adjustment. The soundboard is openwork in (8) and twisted, in order to increase its internal tension in order to have a three-dimensional sound propagation.



  The figure (2) sound reproduction device consists of the figure device (1) added by two other soundboards (9,10) of convex shape and wooden 2 millimeters thick linked together by at least an elastic junction (11) in this example eight junctions, which aims to increase sound vibrations in the three orthonormal axes.



  The present method and its apparatus are useful in the field of sound production and reproduction, as well as in the audio visual field.

Claims

 CLAIMS 1-Process characterized in that the connections between on the one hand the magnet and its bowl and on the other hand the coil and its membrane are linked by elastic connections constituting an electroacoustic transducer for the reproduction of sound or the production of his.
2-A method according to claim 1 characterized in that the membrane is at least a harmonic table, a vibrating volume deformable by internal tensions which improve the sound rendering by the transfer of three-dimensional sound vibrations around the periphery of the assembly of the soundboard, on three orthonormal axes, by the dissipation of sound vibrations.
3-Apparatus for the production or reproduction of sound, is supplied by an electrical audio signal characterized in that the electrical coil is coupled to its magnet by at least one elastic connection, for example produced by an elastomer.
4-Apparatus according to claim 3 characterized in that the coil is integral with at least one soundboard, vibrating volume due to the compliance of the material for example, wood.
5-Apparatus according to claims 3 or 4 characterized in that the soundboard can be perforated.
6-Apparatus according to one of claims 3 to 5 characterized in that the soundboard is twisted.
PCT/FR2001/002415 2000-07-24 2001-07-24 Integral diaphragm with amplified mechanical resonance WO2002009472A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0009650A FR2812165B1 (en) 2000-07-24 2000-07-24 Solidarity membrane with improved mechanical resonance
FR00/09650 2000-07-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU7990301A AU7990301A (en) 2000-07-24 2001-07-24 Integral diaphragm with amplified mechanical resonance

Publications (1)

Publication Number Publication Date
WO2002009472A1 true WO2002009472A1 (en) 2002-01-31

Family

ID=8852824

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2001/002415 WO2002009472A1 (en) 2000-07-24 2001-07-24 Integral diaphragm with amplified mechanical resonance

Country Status (3)

Country Link
AU (1) AU7990301A (en)
FR (1) FR2812165B1 (en)
WO (1) WO2002009472A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912454A (en) * 1932-03-03 1933-06-06 William H Hutter Acoustic apparatus
DE1925119A1 (en) * 1968-05-18 1969-11-27 Nippon Musical Instruments Mfg Loudspeaker diaphragm having plastics foam sounding
FR2759480A1 (en) * 1997-02-13 1998-08-14 Emile Tamagna Sound augmenting device for classical guitar

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912454A (en) * 1932-03-03 1933-06-06 William H Hutter Acoustic apparatus
DE1925119A1 (en) * 1968-05-18 1969-11-27 Nippon Musical Instruments Mfg Loudspeaker diaphragm having plastics foam sounding
FR2759480A1 (en) * 1997-02-13 1998-08-14 Emile Tamagna Sound augmenting device for classical guitar

Also Published As

Publication number Publication date
FR2812165B1 (en) 2003-01-24
FR2812165A1 (en) 2002-01-25
AU7990301A (en) 2002-02-05

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