EP3085108B1 - Akustisches gehäuse mit einer nicht wärmeleitenden aussenwand, einem elektrodynamischen lautsprecher und einer elektronischen steuerschaltung - Google Patents

Akustisches gehäuse mit einer nicht wärmeleitenden aussenwand, einem elektrodynamischen lautsprecher und einer elektronischen steuerschaltung Download PDF

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Publication number
EP3085108B1
EP3085108B1 EP14821123.8A EP14821123A EP3085108B1 EP 3085108 B1 EP3085108 B1 EP 3085108B1 EP 14821123 A EP14821123 A EP 14821123A EP 3085108 B1 EP3085108 B1 EP 3085108B1
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EP
European Patent Office
Prior art keywords
loudspeaker
acoustic enclosure
electronic circuit
motor
heat
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.)
Active
Application number
EP14821123.8A
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English (en)
French (fr)
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EP3085108A1 (de
Inventor
Antonio Oliveira
Emmanuel Nardin
Pierre-Emmanuel Calmel
Julien BERGÈRE
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.)
Devialet SA
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Devialet SA
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Publication of EP3085108A1 publication Critical patent/EP3085108A1/de
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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
    • H04R9/022—Cooling arrangements
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
    • H04R1/2823—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2826—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/007—Protection circuits for transducers
    • 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
    • H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure

Definitions

  • Such a device is usually described as an "active loudspeaker".
  • these elements are enclosed in a substantially sealed box vis-à-vis the air outside the speaker.
  • both the electronic circuit and the speaker (s) give off heat when the loudspeaker is in operation.
  • the electronic circuit typically emits between 40 watts and 300 watts depending on the level of use.
  • the power released is rather from 20 W to 50 W.
  • the speaker (s) typically emit up to 100 W of heat per 1000 W of peak power received.
  • the use of the loudspeaker is generally for a relatively long period.
  • the electronic circuit may be damaged if the temperature of its components exceeds eg 65 ° C.
  • the coil of a loudspeaker may be damaged if its temperature exceeds for example 200 ° C.
  • the neodymium magnets generally present in the loudspeaker motor may experience permanent power loss if their temperature exceeds about 80 ° C.
  • acoustic enclosure whose outer walls are heat conducting.
  • the outer walls are for example metal.
  • these walls are thermally insulated from the loudspeakers by a seal providing acoustic sealing.
  • the cooling time constants of the loudspeakers are high, of the order of several hours.
  • vent in English: bass reflex
  • bass reflex acoustic speakers
  • An object of the invention is therefore to provide an acoustic enclosure as described above and which is not limited or less limited in power due to the heating of its internal components.
  • the subject of the invention is an acoustic enclosure according to claim 1.
  • an acoustic enclosure 1 is described according to a first embodiment of the invention.
  • the figure 1 is a section along a plane P which is for example horizontal when the acoustic chamber 1 is placed on a horizontal surface (not shown) or fixed on a wall (not shown).
  • the acoustic enclosure 1 has a generally parallelepipedal general shape.
  • the acoustic chamber 1 has another general shape, preferably substantially spherical.
  • the loudspeaker 1 comprises a loudspeaker 5, an electronic control circuit 10 for the loudspeaker 5, a heat-conducting member 15, and an external wall 20 that is non-conductive of heat and at least partially defining a box. 25 of the loudspeaker.
  • the acoustic chamber 1 further comprises a seal 30 interposed between the loudspeaker 5 and the outer wall 20, a seal 32 interposed between the outer wall 20 and a first face 34 of the member 15, and a seal 36 interposed between the outer wall 20 and a second face 38 of the member 15, opposite the first face 34 in a transverse direction T of the acoustic enclosure 1.
  • the acoustic enclosure 1 also comprises a first thermal bridge 40 connecting the speaker 5 and the member 15, and a second thermal bridge 42 connecting the electronic circuit 10 and the member 15.
  • the loudspeaker 5 comprises a frame 44, a diaphragm 46, and a motor 48.
  • the motor 48 is able to release heat when the loudspeaker 1 is in operation.
  • the motor 48 comprises a coil defining an axis D of the loudspeaker 5, for example substantially parallel to the transverse direction T.
  • the motor 48 is fixed on the member 15 via the first thermal bridge 40.
  • thermal bridge between two parts means one or more elements connecting the two parts and adapted (s) to conduct heat in one direction or the other between the two parts.
  • the elements of the thermal bridge are adapted so that the thermal resistance between the two parts is less than or equal to 5 ° C / W, preferably less than or equal to 3 ° C / W, even more preferably less than or equal to at 1 ° C / W.
  • the main material constituting the thermal bridge advantageously has a thermal conductivity greater than or equal to 1 W / m.K.
  • chassis 44 or the motor 48 are fixed directly on or are in direct contact with the member 15.
  • the frame 44 has a peripheral portion 50 with respect to the axis D and fixed on the outer wall 20, advantageously all around the periphery of the speaker 5 about the axis D.
  • the membrane 46 is substantially flat, or substantially forms a sphere portion.
  • the membrane 46 is suspended from the frame 44, advantageously by the seal 30.
  • the electronic circuit 10 comprises for example a printed circuit 52 fixed on the second thermal bridge 42, and electronic components 54 mounted on the printed circuit 52.
  • the printed circuit 52 is for example substantially parallel to a connecting portion 56 of the member 15.
  • the electronic components 54 are able to release heat when the loudspeaker 1 is in operation.
  • the member 15 extends inside and across the box 25, for example substantially perpendicular to the axis D of the speaker 5.
  • the member 15 comprises the connecting portion 56, a radiator 58 disposed in an opening 60 of the box 25, and a third thermal bridge 62 connecting the connecting portion and the radiator.
  • the third thermal bridge 62 is replaced by a frank contact between the connecting portion 56 and the radiator 58, or by a paste or a grease.
  • the connecting portion 56 has for example a generally planar shape.
  • the connecting portion 56 is for example substantially perpendicular to the axis D of the speaker 5.
  • the connecting portion 56 is for example metal, preferably aluminum, magnesium, or steel.
  • the connecting portion 56 is for example a single piece.
  • the member 15 is in one piece.
  • the radiator 58 extends in a plane substantially perpendicular to the connecting portion 56.
  • the radiator 58 advantageously comprises fins 64 projecting outwardly of the acoustic chamber 1.
  • the radiator 58 defines a clean exchange surface 66 to be traversed by a heat flow 68 flowing in the member 15 from the motor 48 and the electronic circuit 10 when the acoustic chamber 1 is in operation.
  • conductor is meant that the member 15 has, at least on the path of the heat flux 68, a conductivity ⁇ greater than or equal to 1 W / m.K.
  • the outer wall 20 comprises two half-shells 70, 72.
  • non-heat conductor or “thermally insulating” is meant a material having a thermal conductivity ⁇ strictly less than 1 W / m.K.
  • the half-shell 70 is fixed on the peripheral portion 50 of the loudspeaker 5 and on the first face 34 of the member 15.
  • the half-shell 72 is fixed on the second 38 of the member 15.
  • the seals 30, 32, the loudspeaker 5, the member 15 and the outer wall 20 define a first internal volume 74 that is substantially sealed with respect to 76.
  • the half-shell 72 and the member 15 define a second internal volume 78 that is substantially airtight with respect to the outside air 76.
  • the first internal volume 74 houses the motor 48.
  • the second volume 78 houses the electronic circuit 10.
  • the member 15 puts in thermal communication the motor 48, the electronic circuit 10 and the outside air 76.
  • the motor 48 and the electronic circuit 10 give off heat.
  • the heat released by the motor 48 passes into the member 15 via the first thermal bridge 40.
  • the heat released in the electronic circuit 10 passes into the member 15 via the second thermal bridge 42. It is created in the member 15 the flow of heat 68 from the motor 48 and the electronic circuit 10.
  • the heat flow 10 passes through the third thermal bridge 62 and arrives in the radiator 58.
  • the heat flux 10 then passes through the exchange surface 66 to dissipate in the outside air 76.
  • the member 15 it is possible to extract a large fraction of the heat that is released in the motor 48 and in the electronic circuit 10, and to evacuate it outside the the acoustic enclosure 1. Thus, it is possible to prevent overheating of the motor 48 or the electronic circuit 10.
  • the loudspeaker 5 is heated by the electronic circuit 10.
  • the heat generated by the electronic circuit 10 is driven by the second thermal bridge 42, member 15 and the first thermal bridge 40 to the motor 48.
  • the motor 48 does not release, or very little heat as the sound volume of the speaker 1 remains low. Indeed, the power consumed 'at rest' by the electronic circuit is not zero, so for the void or low noise volumes, most of the heat production is performed at the electronic circuit.
  • the member 15 it is possible to make the box 25 in a material other than metal, while properly discharging the heat released by the motor 48 and the electronic circuit 10.
  • the member 15 constitutes an internal reinforcement of the acoustic enclosure 1, on which the external wall 20 is fixed in a substantially watertight manner.
  • the acoustic enclosure 100 is similar to the acoustic enclosure 1 shown in FIG. figure 1 . Similar elements have the same numerical references on figures 2 and 3 . Only the differences between the loudspeaker 100 and the loudspeaker 1 will be described in detail below.
  • the loudspeaker 100 comprises a second loudspeaker 105, and a second electronic circuit 110 for controlling the second loudspeaker 105.
  • the second speaker 105 is advantageously structurally analogous to the loudspeaker 5.
  • the second speaker 105 comprises in particular a motor 148 able to release heat when the loudspeaker 100 is in operation.
  • the second speaker 105 is for example disposed on the other side of the member 15 with respect to the loudspeaker 5.
  • the motor 148 is connected to the member 15 by a fourth thermal bridge 140.
  • the electronic circuit 10 is located in the internal volume 74.
  • the electronic circuit 10 is connected to the first face 34 of the member 15 by the second thermal bridge 42.
  • the second electronic circuit 110 is located in the second internal volume 78.
  • the second electronic circuit 110 is connected to the member 15 by a fifth thermal bridge 142.
  • the fifth thermal bridge 142 is for example fixed on the second face 38 of the member 15.
  • the member 15 occupies a substantially median position in the box 25 in the transverse direction T.
  • the first electronic circuit 10 and the second electronic circuit 110 are for example connected by cables 112.
  • the member 15 of the acoustic chamber 100 is for example devoid of a radiator extending in an opening defined by the box 25.
  • the member 15 internally defines a passage 114 through the acoustic chamber 100.
  • the passage 114 comprises at least one inlet 116 for the outside air 76, and an outlet 118.
  • the passage 114 is adapted to allow an outside air flow from the inlet 116 to the outlet 118.
  • the member 15 advantageously comprises fins 120 projecting into the passage 114.
  • the exchange surface 66 defined by the member 15 delimits the passage 114.
  • the input 116 is below the output 118.
  • the passage 114 is adapted to function substantially as a chimney.
  • the operation of the acoustic chamber 100 is similar to that of the acoustic chamber 1, except that the heat flow 68 from the motor 48 and the electronic circuit 10 passes through the exchange surface 66 to be carried away. by the air circulation F.
  • a heat flux 168 from the motor 148 and the second electronic circuit 110 passes through the exchange surface 66 to pass into the air flow F.
  • the heat dissipation mode of the acoustic enclosure 100 (chimney) and the heat dissipation mode of the acoustic enclosure 1 (radiator) are combined.
  • the acoustic enclosure 100 comprises a fan (not shown) located in the passage 114 and adapted to create a forced circulation of outside air in the passage 144.
  • Acoustic speaker 200 is similar to loudspeaker 1 shown in FIG. figure 1 . Similar elements bear identical numerical references. Only the differences between the loudspeaker 200 and the loudspeaker 1 represented on the figure 1 will be described in detail below.
  • the member 15 comprises a connecting portion 156 lying on the surface of the acoustic chamber 200 so as to partially form the box 25.
  • the electronic circuit 10 is located in the internal volume 74.
  • the second thermal bridge 42 is fixed on the first face 34 of the member 15.
  • the exchange surface 66 is defined by the radiator 58 and the second face 38 of the connecting portion 156.
  • part of the heat flow 68 coming from the motor 48 and the electronic circuit 10 is evacuated in the outside air 76 by the second face 38 of the member 15.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Claims (6)

  1. Lautsprecherbox (1; 200), umfassend:
    - eine externe Wand (20), die nicht wärmeleitend ist und mindestens teilweise ein Gehäuse (25) der Lautsprecherbox definiert,
    - mindestens einen elektrodynamischen Lautsprecher (5), der einen Motor (48) umfasst, wobei der Lautsprecher (5) einen peripheren Abschnitt (50) aufweist, der an der externen Wand (20) befestigt ist, und
    - mindestens eine elektronische Schaltung (10) zum Steuern des Lautsprechers (5),
    wobei:
    - der Motor (48) des Lautsprechers (5) und die elektronische Schaltung (10) mit dem gleichen Teil (15) der Lautsprecherbox (1; 200) verbunden sind, wobei das Teil (15) wärmeleitend ist und eine Austauschoberfläche (66) umfasst, die dazu geeignet ist, dass ein Wärmefluss (68) diese durchquert, der in dem Teil (15) von dem Motor (48) und der elektronischen Schaltung (10) kommend fließt, wenn die Lautsprecherbox (1; 200) in Betrieb ist, wobei der Wärmefluss (68) dazu gedacht ist, in die Außenluft (76) der Lautsprecherbox (1; 200) abgeleitet zu werden oder in ein wärmeleitendes Element überzugehen, das außerhalb der Lautsprecherbox (1; 200) liegt,
    - das Teil (15) einen Kühlkörper (58) umfasst, der die Austauschoberfläche (56) mindestens teilweise definiert,
    und dadurch gekennzeichnet, dass
    - das Teil (15) ferner einen Verbindungsabschnitt (56) umfasst, mit dem der Motor (48) des Lautsprechers und die elektronische Schaltung (10) verbunden sind, wobei der Verbindungsabschnitt mit dem Kühlkörper (58) direkt oder über eine Wärmebrücke (62) verbunden ist,
    - sich der Verbindungsabschnitt (56) im Innern des Gehäuses (25) erstreckt, und
    - sich der Kühlkörper (58) in einer Ebene erstreckt, die zu dem Verbindungsabschnitt (56) rechtwinklig ist.
  2. Lautsprecherbox (1; 200) nach Anspruch 1, wobei der Motor (48) des Lautsprechers (5) an dem Teil (15) direkt oder über einen Rahmen (44) des Lautsprechers (5) befestigt ist.
  3. Lautsprecherbox (1; 200) nach Anspruch 1, wobei der Motor (48) des Lautsprechers (5) oder die elektronische Schaltung (10) mit dem Teil (15) mindestens über eine Wärmebrücke (40, 42) verbunden ist.
  4. Lautsprecherbox (1; 200) nach einem der Ansprüche 1 bis 3, wobei der Verbindungsabschnitt (56) zu mindestens 80 Massenprozent aus Metall besteht.
  5. Lautsprecherbox (200) nach einem der Ansprüche 1 bis 4, wobei sich der Verbindungsabschnitt (56) mindestens teilweise an der Oberfläche der Lautsprecherbox (200) befindet, um teilweise das Gehäuse (25) zu bilden.
  6. Lautsprecherbox (1; 200) nach einem der Ansprüche 1 bis 5, wobei die externe Wand (20) ferner an dem Teil (15) befestigt ist, wobei der Lautsprecher (5), die externe Wand (20) und das Teil ein internes Volumen (74) definieren, das gegenüber der Außenluft (76) dicht ist.
EP14821123.8A 2013-12-18 2014-12-16 Akustisches gehäuse mit einer nicht wärmeleitenden aussenwand, einem elektrodynamischen lautsprecher und einer elektronischen steuerschaltung Active EP3085108B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1362924A FR3015166B1 (fr) 2013-12-18 2013-12-18 Enceinte acoustique comprenant une paroi externe non conductrice de la chaleur, un haut-parleur electrodynamique et un circuit electronique de commande
PCT/EP2014/077907 WO2015091446A1 (fr) 2013-12-18 2014-12-16 Enceinte acoustique comprenant une paroi externe non conductrice de la chaleur, un haut-parleur électrodynamique et un circuit électronique de commande

Publications (2)

Publication Number Publication Date
EP3085108A1 EP3085108A1 (de) 2016-10-26
EP3085108B1 true EP3085108B1 (de) 2018-08-29

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EP14821123.8A Active EP3085108B1 (de) 2013-12-18 2014-12-16 Akustisches gehäuse mit einer nicht wärmeleitenden aussenwand, einem elektrodynamischen lautsprecher und einer elektronischen steuerschaltung

Country Status (4)

Country Link
US (1) US10187728B2 (de)
EP (1) EP3085108B1 (de)
FR (1) FR3015166B1 (de)
WO (1) WO2015091446A1 (de)

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FR3087067A1 (fr) * 2018-10-08 2020-04-10 Devialet Enceinte acoustique a deux haut-parleurs tete-beche fixes sur une armature interne

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ITUA20163146A1 (it) * 2016-05-04 2017-11-04 Luxdb Srl Cassa acustica
US10524042B2 (en) 2017-06-27 2019-12-31 Bose Corporation Electro-acoustical transducer arrangements of a sound system
US10104761B1 (en) 2017-06-27 2018-10-16 Bose Corporation Cooling techniques to improve thermal performance of electroacoustic device
US10306386B2 (en) 2017-06-27 2019-05-28 Bose Corporation Portable speaker configurations
WO2019063070A1 (en) * 2017-09-27 2019-04-04 Harman Becker Automotive Systems Gmbh SPEAKER ARRANGEMENT
FR3087071B1 (fr) * 2018-10-08 2020-11-06 Devialet Enceinte acoustique comportant une coque en matiere plastique monobloc
DE102019108423B4 (de) * 2019-04-01 2021-08-05 Svetlomir Aleksandrov Lautsprecherbox und Lautsprecher
TW202102011A (zh) * 2019-06-18 2021-01-01 華碩電腦股份有限公司 揚聲器
US11521909B2 (en) * 2019-10-14 2022-12-06 Google Llc Passive thermal-control system of an electronic speaker device and associated electronic speaker devices
FR3131971B1 (fr) * 2022-01-18 2024-02-02 Devialet Caisson pour système acoustique, système acoustique et procédé de fabrication associés

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3087067A1 (fr) * 2018-10-08 2020-04-10 Devialet Enceinte acoustique a deux haut-parleurs tete-beche fixes sur une armature interne
EP3637790A1 (de) * 2018-10-08 2020-04-15 Devialet Lautsprecherbox mit zwei entgegengesetzt fixierten lautsprechern auf einer innenverschalung

Also Published As

Publication number Publication date
US10187728B2 (en) 2019-01-22
EP3085108A1 (de) 2016-10-26
US20160337756A1 (en) 2016-11-17
WO2015091446A1 (fr) 2015-06-25
FR3015166B1 (fr) 2017-07-14
FR3015166A1 (fr) 2015-06-19

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