WO2011038428A1 - Procédé de fabrication d'éléments d'enceintes acoustiques et enceintes acoustiques - Google Patents

Procédé de fabrication d'éléments d'enceintes acoustiques et enceintes acoustiques Download PDF

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Publication number
WO2011038428A1
WO2011038428A1 PCT/AT2010/000344 AT2010000344W WO2011038428A1 WO 2011038428 A1 WO2011038428 A1 WO 2011038428A1 AT 2010000344 W AT2010000344 W AT 2010000344W WO 2011038428 A1 WO2011038428 A1 WO 2011038428A1
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker
loudspeaker housing
housing
housing parts
producing
Prior art date
Application number
PCT/AT2010/000344
Other languages
German (de)
English (en)
Inventor
Karl Vorlicek
Original Assignee
Karl Vorlicek
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 Karl Vorlicek filed Critical Karl Vorlicek
Priority to DE112010003896T priority Critical patent/DE112010003896A5/de
Publication of WO2011038428A1 publication Critical patent/WO2011038428A1/fr

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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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • 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
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein

Definitions

  • Loudspeakers are installed in housings for a variety of reasons.
  • the closed housing serves to avoid the acoustic short circuit.
  • Bass reflex or Bandpass housing are designed as a resonator, which specifically the transmission behavior can be optimized at low frequencies.
  • the loudspeaker cabinet itself is also a source of error, which can lead to undesirable non-linearities in the transmission behavior and thus to distortions and distortions of sound.
  • the housing or the housing walls must have sufficient stability, otherwise parasitic bending vibrations on the housing components or housing walls can be excited.
  • the housing must provide sufficient insulation, so as not to adversely affect the acoustic efficiency - if the sound radiation is not due to the
  • housings are also constructed according to the sandwich principle, where sand is introduced between the inner and outer housing.
  • Loudspeaker enclosures are usually executed in cuboid shape. Through opposite housing walls with equal intervals, standing in the interior of the housing standing waves, which lead to a non-linearity in the transmission behavior.
  • cuboid housings have three interfering ones
  • Rear wall are set. By arranging damping material inside the housing or by inner partitions, these sound waves are attenuated, but not avoided. By introducing partitions, this effect can be minimized, but as a rule, other frequencies arise due to stagnant waves.
  • the directional characteristic of loudspeakers without pre-set horns shows - especially at high frequencies - an unwanted bundling.
  • the montage of loudspeakers on a flat baffle generally leads to runtime differences between the individual loudspeakers, since the voice coils are not in one plane because of the different overall depths.
  • loudspeaker cabinets should preferably be made with irregular shape - preferably with curved and curved surfaces in order to avoid initially volumes with equal and parallel surface distances.
  • this requires different manufacturing methods than those required for housing of sheet materials.
  • Speaker housing elements or speaker housing in industrial quantities are produced in a casting process from epoxy resins in combination with anhydride hardeners, fillers and additives.
  • anhydride hardeners In contrast to polyurethanes or amine-curing epoxies can be realized with anhydrides Vergußmaye to over 200kg, since the exothermic nature of the crosslinking of the active components can be controlled with appropriately heated molds.
  • the housing elements will be added after the automatic pressure gelation process
  • the parts are generally cured in a separate oven.
  • the reaction mass prepared from epoxy resin, anhydride hardener, filler and additives is preferably degassed before casting in the treatment plant.
  • the potting itself is preferably also carried out under vacuum. As the molds polished
  • the casting process vacuum casting
  • the casting process vacuum casting
  • components with high-gloss surfaces can be created.
  • ADG atmospheric pressure gelling process
  • the mold is filled on its underside (increasing encapsulation).
  • the existing in the form of air is displaced during the filling process via vents from the potting compound - can be dispensed with the application of vacuum, for the highest
  • Reworking - such as puttying to close voids, air pockets and pores, and no sanding - is required to achieve the desired surface finish.
  • pigments By adding pigments, the desired color tone can be adjusted. With additives such as mica or metal particles, a shimmering surface can be achieved.
  • Hardener mixture consisting of about 30% Methylhexahydrophtalklareanhydrid and 70% Hexahydrophtalklareanhydrid mixed.
  • solid hardeners phthalic anhydride, hexahydrophthalic anhydride or tetrahydrophthalic acid amide can be used: these are added in an amount of 30-40 GT to 100 GT resin.
  • Flexibilizers such as polyethylene or polypropylene glycol are incorporated in amounts of about 20 pbw to 100 pbw of resin.
  • Toughening modifier is mixed in 0 to about 15GT to 100 GT resin.
  • the mixture is adjusted with an accelerator for optimum process times - for example, 0 to 2.5 GT tertiary amine, about BDMA added to 100 GT resin .
  • Pigments or color powder such as carbon black or iron oxide, titanium oxide can, depending on color and color saturation up to 5 GT can be included in the mixture.
  • filler is also added to the mixture.
  • the total filler content of the mixture should exceed 55%, ideally between 57 and 75%.
  • Difference amount to 100% consists of the above-described epoxy mixture.
  • the filler used is preferably quartz powder, but also chalk (with round or rod-shaped grain), or else aluminum oxide or aluminum trihydrate. Also
  • Rubber balls or gum can be used if the proportion reaches or exceeds at least the content of the epoxy resin / hardener mixture (This ratio, which is practically usable with epoxy mixtures with anhydride hardeners, at the same time results in a distinction from the document DE 3905562.)
  • a mixture of at least two fillers will be used.
  • quartz powder may be mixed with chalk with or gum, or colorite may be mixed with chalk.
  • the respective mixtures are listed.
  • the ratio of the active components to the filler is shown by way of example in the first column.
  • Preferred filler mixtures ratio of the amounts of filler to one another in
  • Aluminum trihydrate or magnesium trihydrate may be used as an anti-flaming filler alone, e.g. instead of quartz flour or as an additive.
  • the different densities and degrees of hardness are shown below. Filler combinations with different hardnesses and densities have an acoustically particularly favorable effect and should therefore be used with preference.
  • the hollow spheres play a special role as fillers: these are available, for example, as hollow phenolic resin beads, hollow polyethylene beads or aluminum silicate hollow spheres.
  • Preferably glass hollow spheres but also hollow metal spheres can be added to the active epoxy mixture alone or in combination with mineral fillers. With these hollow spheres, the density of the total mixture can be reduced by up to about 30%, which is advantageous for large-volume housings.
  • the hollow spheres - especially in combination with mineral fillers - cause the reduction of the sound conduction at medium and higher frequencies and a reduction of the sound conduction
  • Fiberglass chips are added. But it can also reinforcing fabric or
  • Reinforcing nets are inserted into the mold, made of carbon, glass, aramid or
  • Speaker elements are produced, which are produced by this method.
  • Housing elements can be additionally reinforced mechanically by fabric inserts, for example by nets, which are encapsulated.
  • Mounting elements such as
  • Threaded bushes for speaker attachment or for fastening the front panel to the other housing parts are fixed in the mold and surrounded. No further
  • the front panel could be screwed to a corpus made of chipboard or MDF panels and brings considerable advantages; amongst other things:
  • Housing body presented.
  • the outer body is shown for ease of illustration with flat surfaces, these are preferably performed curved in practice.
  • Wall thickness gradient increases to the center approximately with the profile of a Gaussian bell curve.
  • bending vibrations are avoided, on the other hand, the formation of standing waves is minimized, since the spectrum is fanned out according to the different wall - distances (by reflection) and reduced in intensity.
  • the proposal according to DE 4000132 has inside walls with pillow-shaped course and only slight bends, these elements are subsequently mounted on flat surfaces of a flat wooden housing, which is very cumbersome and costly. Furthermore, the large radii of curvature according to DE 4000132 have less sound-scattering effect than the proposal described here).
  • the reinforcements with the Gaussian curve profile can also merge into one another so that walls lying opposite one another are connected to one another and a reinforcing plate is formed inside the body ,
  • the air volumes in front of and behind the reinforcement are given by decreasing heights of the Gaussian curve to the side and bottom and top elements, respectively.
  • air outlets can also be created by appropriate drilling, for which the Form is to be executed with corresponding cores and Kernscopen.
  • Figure 3a again shows the plate-shaped stiffening and schematically the stiffening with elements which have a gaussian curve-like cross section (Figure 3b).
  • the rear wall is preferably reinforced as well. The connection is made by screwing or
  • Bonding with the body or the housing body is preferably with the
  • Reinforcing plate cast in one piece.
  • FIGs. 4a and 4b Another embodiment is shown in Figs. 4a and 4b:
  • the body can be made with back wall in one piece; Rear wall and side parts in turn have the reinforcements with Gaussian curve profile; in such a way that the rear wall and side parts are connected by these profiles cross-shaped.
  • the front reinforcement strut is not shown in the drawing for clarity.
  • the height of the profiles may be identical, but will preferably be different. In Figure 4b, the height of the bell curves to the center drops off, it can have the Gaussian profiles in particular pronounced height saddles, which find the voice coils of the speakers between theirviolnhöckern. The height drop is preferably realized rounded - in Figure 4b, the height increase was shown linear.
  • the height of the Gaussian reinforcing profile begins approximately at the entire depth of the side parts and then falls saddle-shaped between the location of the voice coil of the
  • Reinforcement profiles on the wall surface can also be made irregular, as shown in Figure 5, so that it does not come to rest parallel to the sides of the housing or housing edges.
  • Figure 5 an elliptical arc-shaped ridge is shown.
  • the profile shape of the stiffeners or the housing walls can the mentioned
  • Gaussian curve profile or it can the wall thickness towards the center with a
  • An essential feature is the creation of curved inner surfaces which are mechanically reinforcing and have good sound dispersion relative to the inner volume of the housing.
  • the shape of the body deviates from the cuboid shape.
  • the floor plan may be larger than the lid, or the rear wall and / or the side panels may be curved.
  • the box can now be produced in the form of an ellipsoid, a paraboloid, in the form of a curved vase cut to one side or in the shape of a bass violin case or any other shape, without the expense of production increasing significantly, as long as undercuts are avoided.
  • loudspeaker casings which are injection molded, extruded or injection molded, the demarcation is given that they can not be so highly filled with mineral and, above all, that the wall thicknesses must be uniform and limited to layer thicknesses of mm range, which is not in sufficient insulation expresses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

Procédé de fabrication d'enceintes acoustiques et d'éléments d'enceintes acoustiques, caractérisé en ce que les éléments d'enceintes acoustiques sont fabriqués selon un procédé de coulée sous vide ou par gélification sous pression automatisée (GPA), de préférence avec des résines époxydes à durcissement par anhydride. Afin d'améliorer l'isolation acoustique et de réduire la conduction sonore, on utilise une combinaison de matériaux de garnissage minéraux tels que la poudre de quartz et de matériaux de garnissage souples ou de billes de verre creuses. Afin d'éviter les ondes stagnantes, les surfaces internes de l'enceinte sont cintrées ou incurvées. Le cintrage des surfaces internes visant à réduire les ondes stagnantes est réalisé par un profil d'épaisseur de paroi de type courbe de Gauss, de sorte que l'épaisseur de paroi augmente vers l'intérieur de l'enceinte, de préférence vers le milieu des surfaces. Ainsi, les ondes sont dispersées de manière aléatoire à l'intérieur de l'enceinte. Des formes d'enceinte irrégulières à surfaces cintrées ou incurvées peuvent ainsi être réalisées sans usinage.
PCT/AT2010/000344 2009-10-01 2010-09-21 Procédé de fabrication d'éléments d'enceintes acoustiques et enceintes acoustiques WO2011038428A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112010003896T DE112010003896A5 (de) 2009-10-01 2010-09-21 Verfahren zur Herstellung von Lautsprechergehäuseelementen und Lautsprechergehäusen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1553/2009 2009-10-01
AT15532009A AT508943B1 (de) 2009-10-01 2009-10-01 Lautsprechergehäuseelemente und lautsprechergehäuse

Publications (1)

Publication Number Publication Date
WO2011038428A1 true WO2011038428A1 (fr) 2011-04-07

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PCT/AT2010/000344 WO2011038428A1 (fr) 2009-10-01 2010-09-21 Procédé de fabrication d'éléments d'enceintes acoustiques et enceintes acoustiques

Country Status (3)

Country Link
AT (1) AT508943B1 (fr)
DE (1) DE112010003896A5 (fr)
WO (1) WO2011038428A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3734990A1 (fr) * 2019-05-02 2020-11-04 Kirwan Lelievre Pavillon acoustique, enceinte acoustique comportant un tel pavillon acoustique et procede de fabrication d'un tel pavillon acoustique
CN115150696A (zh) * 2022-06-30 2022-10-04 歌尔股份有限公司 发声装置的外壳、发声装置及电子设备
CN115175053A (zh) * 2022-06-30 2022-10-11 歌尔股份有限公司 发声装置的外壳、发声装置和电子设备
CN115623395A (zh) * 2022-08-01 2023-01-17 荣耀终端有限公司 一种扬声器及电子设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103295240A (zh) * 2013-06-26 2013-09-11 山东农业大学 一种评价自由曲面相似性的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622375A1 (de) * 1985-07-05 1987-01-15 Jamo Hi Fi As Lautsprechereinheit
DE3905562C1 (fr) 1989-02-02 1990-03-22 Prodan, Hans-Joachim, 4415 Sendenhorst, De
DE4000132A1 (de) 1990-01-04 1991-07-11 Prodan Hans Joachim Lautsprechergehaeuse
EP0604089A1 (fr) * 1992-12-19 1994-06-29 Ciba-Geigy Ag Composition durcissable
WO2000064228A1 (fr) * 1999-04-15 2000-10-26 Schroeder Ernest C Enceintes acoustiques en cellulose moulee par compression et leur procede de fabrication
AT409910B (de) 1996-02-29 2002-12-27 Vorlicek Karl Dipl Ing Verzerrungsarme abstrahleinrichtung für elektroakustische wandler mit verstärkter tieftonwiedergabe

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622375A1 (de) * 1985-07-05 1987-01-15 Jamo Hi Fi As Lautsprechereinheit
DE3905562C1 (fr) 1989-02-02 1990-03-22 Prodan, Hans-Joachim, 4415 Sendenhorst, De
DE4000132A1 (de) 1990-01-04 1991-07-11 Prodan Hans Joachim Lautsprechergehaeuse
EP0604089A1 (fr) * 1992-12-19 1994-06-29 Ciba-Geigy Ag Composition durcissable
AT409910B (de) 1996-02-29 2002-12-27 Vorlicek Karl Dipl Ing Verzerrungsarme abstrahleinrichtung für elektroakustische wandler mit verstärkter tieftonwiedergabe
WO2000064228A1 (fr) * 1999-04-15 2000-10-26 Schroeder Ernest C Enceintes acoustiques en cellulose moulee par compression et leur procede de fabrication

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
COMPOSITE SOLUTIONS AG: "Füllstoffe; Eigenschaften und Funktionen", 7 July 2009 (2009-07-07), XP002619193, Retrieved from the Internet <URL:http://www.compositesolutions.ch/pdf/tds/fuellstoffe.pdf> [retrieved on 20110128] *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3734990A1 (fr) * 2019-05-02 2020-11-04 Kirwan Lelievre Pavillon acoustique, enceinte acoustique comportant un tel pavillon acoustique et procede de fabrication d'un tel pavillon acoustique
CN115150696A (zh) * 2022-06-30 2022-10-04 歌尔股份有限公司 发声装置的外壳、发声装置及电子设备
CN115175053A (zh) * 2022-06-30 2022-10-11 歌尔股份有限公司 发声装置的外壳、发声装置和电子设备
CN115623395A (zh) * 2022-08-01 2023-01-17 荣耀终端有限公司 一种扬声器及电子设备
CN115623395B (zh) * 2022-08-01 2023-10-20 荣耀终端有限公司 一种扬声器及电子设备
WO2024027232A1 (fr) * 2022-08-01 2024-02-08 荣耀终端有限公司 Haut-parleur et dispositif électronique

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Publication number Publication date
AT508943A4 (de) 2011-05-15
DE112010003896A5 (de) 2012-08-02
AT508943B1 (de) 2011-05-15

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