Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R3/00—Circuits for transducers
  • H04R3/007—Protection circuits for transducers
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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

• Acoustic speaker comprising an outer wall which is non-conductive of heat, an electrodynamic loudspeaker and an electronic control circuit
• the present invention relates to an acoustic enclosure comprising:
• At least one electrodynamic loudspeaker comprising a motor, the loudspeaker having a peripheral portion fixed on the outer wall, and
• At least one electronic control circuit of the loudspeaker At least one electronic control circuit of the loudspeaker.
• 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 * 0.
• the coil of a speaker can be damaged if its temperature exceeds for example 200 ⁇ .
• neodymium magnets typically present in the speaker motor may experience permanent power loss if their temperature exceeds about 80 ⁇ .
• acoustic chamber 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
• An object of the invention is therefore to provide a loudspeaker as described above and which is not limited or less limited in power due to heating of its internal components.
• the subject of the invention is an acoustic enclosure comprising:
• At least one electrodynamic loudspeaker comprising a motor, the loudspeaker having a peripheral portion fixed on the outer wall, and
• the loudspeaker motor and the electronic circuit are connected to the same body of the acoustic chamber, the body being heat conducting and having a heat exchange surface adapted to be traversed by a heat flow flowing in the member coming from the motor and the electronic circuit when the loudspeaker is in operation, the heat flow being intended to dissipate in the air outside the acoustic enclosure or to pass in a conductive element of heat outside the acoustic enclosure.
• the acoustic enclosure comprises one or more of the following characteristics, taken separately or in any technically possible combination:
• the loudspeaker motor is fixed on the body directly or via a chassis of the loudspeaker;
• the loudspeaker motor or the electronic circuit is or are linked to the body by at least one thermal bridge;
• the member comprises a radiator defining at least partly the exchange surface, and a connecting portion, preferably metal, to which are connected the speaker motor and the electronic circuit, the connecting portion being connected to the radiator directly or through a thermal bridge;
• the connecting portion is at least 80% by weight of metal
• the connecting portion extends inside the box, preferably across the box;
• the connecting portion is located at least partly on the surface of the acoustic enclosure so as to form part of the box;
• the member internally defines at least one passage through the acoustic chamber, the passage comprising at least one inlet for the outside air, and an outlet, the passage being adapted to allow outside air circulation from the entrance to the outlet, and the member preferably comprising fins to promote the dissipation of the heat flow in the outside air flowing in the passage;
• the acoustic enclosure includes a fan to create a forced circulation of outside air in the passage;
• the outer wall is further fixed on the body, the speaker, the outer wall and the member defining an internal volume substantially sealed vis-à-vis the outside air.
• FIG. 1 is a diagrammatic sectional view of an acoustic enclosure according to a first embodiment of the invention
• FIG. 2 is a schematic sectional view of an acoustic enclosure according to a second embodiment of the invention
• FIG. 3 is a schematic view of the acoustic enclosure shown in FIG. 2, in section along a plane substantially perpendicular to the sectional plane of FIG. 2, and
• FIG. 4 is a schematic sectional view of an acoustic chamber according to a third embodiment of the invention.
• FIG. 1 there is described an acoustic chamber 1 according to a first embodiment of the invention.
• 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 chamber 1.
• the acoustic chamber 1 also comprises a first thermal bridge 40 connecting the loudspeaker 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 membrane 46, and a motor 48.
• the motor 48 is able to release heat when the acoustic enclosure 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 ⁇ / ⁇ , preferably less than or equal to 3 ⁇ / ⁇ , even more preferentially lower or equal to 1 ⁇ C / W.
• the main material constituting the thermal bridge advantageously has a thermal conductivity greater than or equal to 1 W / mK
• 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 for example 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 an exchange surface 66 able to be traversed by a flow of heat 68 flowing in the element 15. from the motor 48 and the electronic circuit 10 when the acoustic enclosure 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,
• 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 substantially sealed vis-à-vis the outside air 76.
• the half-shell 72 and the member 15 define a second internal volume 78 substantially sealed 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 loudspeaker 1. Thus, it is possible to prevent excessive heating 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, organ 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. Similar elements have the same reference numerals in Figures 2 and 3. Only the differences between the speaker 100 and the speaker 1 will be described in detail below.
• the loudspeaker 100 comprises a second loudspeaker 105, and a second electronic circuit 1 10 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 1 10 is located in the second internal volume 78.
• the second electronic circuit 1 10 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 1 10 are for example connected by cables January 12.
• 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 1 14 through the acoustic chamber 100.
• the passage 1 14 comprises at least one inlet 1 16 for the outside air 76, and an outlet 1 18.
• the passage 1 14 is adapted to allow outside air circulation from the inlet 1 16 to exit 1 18.
• the member 15 advantageously comprises fins 120 projecting into the passage 1 14.
• the exchange surface 66 defined by the member 15 delimits the passage 1 14.
• the input 1 16 is below the output 1 18.
• the passage 1 14 is adapted to operate 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 1 10 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 1 14 and adapted to create a forced circulation of outside air in the passage 144.
• the acoustic enclosure 200 is similar to the acoustic enclosure 1 shown in FIG. Similar elements bear identical numerical references. Only the differences between the loudspeaker 200 and the loudspeaker 1 shown in 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)

Applications Claiming Priority (2)

Publications (2)

Family

ID=50179808

Family Applications (1)

Country Status (4)

Families Citing this family (11)

Family Cites Families (12)

• 2013
  • 2013-12-18 FR FR1362924A patent/FR3015166B1/fr active Active
• 2014
  • 2014-12-16 WO PCT/EP2014/077907 patent/WO2015091446A1/fr not_active Ceased
  • 2014-12-16 EP EP14821123.8A patent/EP3085108B1/de active Active
  • 2014-12-16 US US15/105,809 patent/US10187728B2/en active Active

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