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
  • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
  • H04R7/12—Non-planar diaphragms or cones
  • H04R7/127—Non-planar diaphragms or cones dome-shaped
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
  • H04R1/1058—Manufacture or assembly
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
  • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
  • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
  • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
  • H04R2201/029—Manufacturing aspects of enclosures transducers
• • 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
  • H04R2307/027—Diaphragms comprising metallic materials
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49005—Acoustic transducer
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/4902—Electromagnet, transformer or inductor
  • Y10T29/4908—Acoustic transducer

Definitions

• Acoustic transducer in pure beryllium with direct radiation, with a concave membrane, for audio applications in particular for loudspeakers.
• the present invention relates to the technical sector of loudspeakers and in particular of their “tweeter” type component. More precisely, the invention relates to a direct-reproducing sound reproducer, using a very high performance emissive membrane, constituting a point emissive source with very wide bandwidth in the zone of sound frequencies and uitrasonores
• the invention relates to loudspeakers for loudspeakers, in particular of the “tweeters” type or loudspeakers for treble reproduction, or also of “midrange” loudspeakers, and especially for very high loudspeakers. loyalty.
• the diaphragm of a transducer provides mechanical coupling between a voice coil, placed in an air gap and traversed by a modulated current, and the air molecules to ensure sound reproduction.
• Three criteria govern the qualities of a tweeter membrane: its weight, its rigidity and its damping.
• the membrane is usually made of a material offering a good compromise on the three previous criteria. Result: for a tweeter, the intrinsic rigidity of the material limits the high frequency response.
• Be is a potential candidate, but to date unusable without support by technologies reducing on the one hand its cost and allowing its forming in thin sheet despite its very high rigidity well known, and improving on the other hand even “tweeters" technology.
• the invention uses a loudspeaker for an acoustic enclosure, in particular a “tweeter”, or even a “medium”, of original structure, which comprises a spherical membrane with direct radiation, with a face concave with respect to the coil and on which, preferably, is fixed at a certain level, for example at mid-height or substantially at half-height, the voice coil in order to ensure optimal mechanical coupling capable of reproducing frequencies below 1 KHz with high efficiency.
• a loudspeaker for an acoustic enclosure in particular a “tweeter”, or even a “medium”, of original structure, which comprises a spherical membrane with direct radiation, with a face concave with respect to the coil and on which, preferably, is fixed at a certain level, for example at mid-height or substantially at half-height, the voice coil in order to ensure optimal mechanical coupling capable of reproducing frequencies below 1 KHz with high efficiency.
• a tweeter has a diameter of less than 50 - 70 mm while a "medium” speaker generally has a diameter of 100 to 200 mm for a thickness of 0.1 to 0.4 mm.
• the low resonant frequency of the tweeter can be adjusted as required, by the possible use of an attached suspension with high compliance.
• the mass of the membrane should be reduced and its stiffness increased.
• the high frequency response can be extended to more than 40 KHz.
• the combination of the concave dome technology, preferably with added suspension, with the specific characteristics of the pure beryllium membrane makes it possible to produce a point emissive source with direct radiation and low directivity, having a bandwidth of more than 5 octaves from 1 kHz to 40 kHz with a high efficiency of more than 92 dB / 1W / 1 m.
• the invention also relates to and employs a process for forming thin sheets of certain metals or alloys, in particular beryllium. More particularly, but not limited to, the sheets thus formed can be used in domes of “tweeters” for the acoustic speakers, and “medium”.
• Beryllium is particularly preferred, but it is also possible, according to the invention, to envisage Be alloys, in particular Be / Al, in particular alloys 20 - 80% Be by weight / 80 - 20% Al by weight, preferably 40 - 60 % Be / 60 - 40% Al, with at least 5% by weight of Be. Pure Be will be reserved for very high-end manufacturing, and alloys with aluminum in the mid-range.
• Aluminum or aluminum alloys can also be used for entry-level products (in particular the Al / Be alloys described above for a mid-range).
• magnesium and its alloys with aluminum can also be used.
• An interesting alloy is then, without limitation, the alloy Al 5 5056 known to those skilled in the art, which is an aluminum alloy containing about 5% of magnesium.
• the invention uses, according to a nonlimiting but preferred embodiment (FIG. 1), a tweeter 1 of original structure, which comprises a spherical membrane 2 with direct radiation, of concave shape with respect to the coil 3.
• a tweeter 1 of original structure which comprises a spherical membrane 2 with direct radiation, of concave shape with respect to the coil 3.
• spherical membranes of convex shape with respect to the coil that is to say in a “dome” above the coil, were used.
• the membrane forms a cut above the coil.
• the low resonant frequency of the tweeter is adjustable as required, by the possible use of a suspension attached to high compliance, that is to say material with great flexibility like foam or soft rubber seals, or remaining bonding " slack "over time.
• An entirely preferred membrane according to the invention is made of pure Be.
• the pure Be membrane has a thickness of between 25 and 500 microns and preferably less than 30 microns for a typical tweeter dome with a diameter of 25 mm and a depth of between 3 and 6 mm and a coil. from 15 to 20 mm in diameter.
• the shape of the dome can be hemispherical or with a complex profile, ovoid, bulbous or with cut sides.
• a membrane 2 made of pure beryllium 25 microns thick is used with a semi-spherical profile concave with respect to the coil 3, optimized to repel its own resonant frequency as high as possible.
• the voice coil is fixed between the top of the dome and the periphery (plane AB) of this semi-spherical membrane to ensure ideal mechanical coupling.
• a suspension S with suitable compliance can be added to ensure the connection of the membrane to the support with a sufficiently low resonance frequency typically 1 kHz.
• tweeter makes it possible to reproduce an extended frequency range over more than 5 octaves without having recourse to a known technology called "super tweeter” which is problematic because it introduces a time shift due to the multiplication of sources. emissive at frequencies whose wavelength is of the order of a centimeter, thus annihilating the notion of point source essential in the re-creation of 3D sound space.
• FIG. 3 shows the superimposed impulse response curves of a titanium dome and a beryllium dome for a 25 mm diameter tweeter dome.
• the invention uses to manufacture the beryllium membrane a process for forming thin sheets of metal described in detail in the British patent application filed on the same day as the present application, and in the name of Mr. Roy Rodriguez, characterized in that the said sheet is deformed by a pressure of a gas applied at ambient temperature or close to ambient temperature on one of its faces, and it is applied by said pressure effect the second face of said deformed sheet on a shape reproducing the 3D geometry of the part to be produced, and said shape is brought to high temperature for the time necessary for forming without physico-chemical degradation of said sheet.
• the invention therefore also uses a tool for forming (also described in said British application) of thin sheets of metal, to manufacture parts of given 3D geometry, characterized in that it comprises an upper matrix comprising at least one nozzle d injection of gas under pressure, and a lower form (by convention, we will consider that the tool is horizontal), the upper face of which reproduces the 3D imprint of the part to be formed, and which comprises a means of heating its mass .
• the sheet rests on the lateral supports of the imprint.
• said shape is a female tool.
• the metal is beryllium. It is the one that presents both the greatest interest with regard to tweeter domes, or medium, and the greatest formatting difficulties.
• said metal is aluminum and its alloys or other materials known to those skilled in the art, adapted according to the knowledge of those skilled in the art to the production of a tweeter dome.
• the thickness of the beryllium sheets (or Al or aluminum alloys, and possibly beryllium alloys, in particular Be / Al alloys) at the start is between 10 and 500 microns.
• said thickness is between 20 and 100 microns. According to yet another particular embodiment, said thickness is of the order of 25 to 50 microns.
• the gas injected by the nozzle (s) is chosen from air or nitrogen.
• nitrogen will be used.
• the pressure of said gas will be between 10 and 30 bars for a dome diameter less than 50 mm.
• said pressure will be between 15 and 25 bars.
• said pressure will be approximately 20 bars for a beryllium sheet 25 microns thick.
• said pressure will be 15 bars for an aluminum sheet 25 microns thick.
• the form is brought to a temperature of the order of 100 to 400 ° C for aluminum or magnesium sheets, or their alloys, and of the order of 700 to 1000 ° C for a beryllium sheet, or its alloys, in its mass, for example by means of a heating element 20 disposed under or around said shape.
• said temperature is of the order of 900 ° C. for a sheet of pure beryllium 25 microns thick.
• the skilled person knows that the temperature will have to be lower than for pure metals: he will therefore be able to adapt the above temperature ranges according to the alloys he wishes to use, and if necessary to using some simple routine tests.
• the shape of the tool is made of any material suitable for the transmission of the process temperature and the resistance to the pressure applied, and does not not reacting, under these conditions of temperature and pressure, with beryllium. Mention will in particular be made of steels with possibly surface treatment.
• a dome with a diameter of 35 mm was formed in just 15 seconds to “tweet” from a 38 micron sheet of 95% Al / Mg 5% Al alloy, using N2 as a pressure applying gas and applying a temperature of 400 ° C to the sheet.
• the invention also relates to the domes for tweeters and midrange thus obtained, as well as the loudspeakers comprising at least one loudspeaker as described above and / or at least one dome as described above.
• the invention also covers all the embodiments and all the applications which will be directly accessible to those skilled in the art on reading the present application, their own knowledge, and possibly simple routine tests.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Signal Processing (AREA)
• Manufacturing & Machinery (AREA)
• Multimedia (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Details Of Audible-Bandwidth Transducers (AREA)
• Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=33041897

Family Applications (1)

Country Status (10)

Cited By (1)

Families Citing this family (13)

Citations (1)

Family Cites Families (29)

• 2003
  • 2003-04-16 FR FR0304733A patent/FR2854021B1/fr not_active Expired - Lifetime
• 2004
  • 2004-03-22 AU AU2004231892A patent/AU2004231892A1/en not_active Abandoned
  • 2004-03-22 JP JP2006505744A patent/JP2006523981A/ja active Pending
  • 2004-03-22 EP EP04742314A patent/EP1618761A2/fr not_active Withdrawn
  • 2004-03-22 RU RU2005135455/28A patent/RU2005135455A/ru not_active Application Discontinuation
  • 2004-03-22 CA CA2522519A patent/CA2522519C/fr not_active Expired - Fee Related
  • 2004-03-22 CN CNA2004800103572A patent/CN1774954A/zh active Pending
  • 2004-03-22 US US10/553,185 patent/US20060113144A1/en not_active Abandoned
  • 2004-03-22 KR KR1020057019673A patent/KR20060008898A/ko not_active Application Discontinuation
  • 2004-03-22 WO PCT/FR2004/000704 patent/WO2004095881A2/fr active Application Filing
• 2009
  • 2009-02-04 US US12/365,537 patent/US7878297B2/en not_active Expired - Lifetime

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