• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Acoustic chamber (1) comprising: - an outer wall (20) which is non-conductive of heat and at least partially defines a box (25), - at least one electrodynamic loudspeaker (5) comprising a motor (48), the loudspeaker having a peripheral portion (50) attached to the outer wall, and - at least one electronic control circuit (10) for controlling the loudspeaker. The motor and the electronic circuit are connected to the same body (15) of the acoustic enclosure. The member is a heat conductor and has an exchange surface (66) adapted to be traversed by a heat flux (68) flowing in the member coming from the motor and the electronic circuit when the acoustic loudspeaker is in position. operation, the heat flow being intended to dissipate in the outside air (76) to the acoustic enclosure or to pass in a conductive element of the heat outside the acoustic enclosure.
    公开号:FR3015166A1
    申请号:FR1362924
    申请日:2013-12-18
    公开日:2015-06-19
    发明作者:Antonio Oliveira；Emmanuel Nardin；Pierre-Emmanuel Calmel；Julien Bergere
    申请人:Devialet SA；
    IPC主号:
    专利说明:

    [0001] Acoustic speaker comprising an external non-conductive wall of heat, an electrodynamic loudspeaker and an electronic control circuit The present invention relates to an acoustic loudspeaker comprising: an external wall which is non-conductive of heat and which at least partly defines a box of the acoustic enclosure, 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. Such a device is usually described as an "active loudspeaker". In general, these elements are enclosed in a substantially sealed box vis-à-vis the air outside the speaker. However, both the electronic circuit and the speaker (s) give off heat when the loudspeaker is in operation. For example, the electronic circuit typically emits between 40 watts and 300 watts depending on the level of use. Using power and amplification technologies with very high efficiency, the power output is rather from 20 W to 50 W. The speaker (s) typically give off up to 100 W of heat, per 1000 W of electric power received in peak. In addition, the use of the loudspeaker is generally for a relatively long period.
    [0002] Thus, there is a risk of overheating of the internal components of the enclosure due to heating of the internal air. The electronic circuit may be damaged if the temperature of its components exceeds eg 65 ° C. Similarly, the coil of a loudspeaker may be damaged if its temperature exceeds for example 200 ° C. In addition, the neodymium magnets generally present in the loudspeaker motor may experience permanent power loss if their temperature exceeds about 80 ° C. To remedy these drawbacks, it is known to connect a heat sink to the electronic circuit. The heat sink is placed inside the loudspeaker. The heat sink ensures a rapid heat exchange between the electronic circuit and the internal air of the acoustic enclosure. Such a solution partly solves the problem of the heating of the electronic circuit, but it is only suitable for a relatively low power acoustic enclosure. It is also known to use a heat sink placed outside the speaker and connected to the electronic circuit. This ensures a cooling of the electronic circuit, but there is a risk of overheating of the speakers and the internal air of the speaker.
    [0003] Similarly, it is known to fix a radiator at the rear of the speaker, in the chamber of the speaker. Such a solution does not dissipate a significant thermal power and there is a heating of the internal air of the speaker.
    [0004] It is also known to provide an acoustic enclosure whose outer walls are heat conducting. The outer walls are for example metal. In general, 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.
    [0005] Also known acoustic speakers called "vent" (in English: bass reflex) which provide an air exchange with the outside and thus allow cooling of the internal air, especially during strong movements of the membrane of the speaker. It is known to place a heat sink of the electronic circuit near the vent, so as to maximize heat exchange with the outside.
    [0006] It is also known to protect the electronic circuit by using thermal sensors to limit the thermal power transmitted by the electronic circuit to the speakers, or to put the electronics off or in standby state until the cooling circuit electronics at acceptable temperatures. However, these technical solutions do not completely eliminate the risk of overheating, especially when using the loudspeaker with very high power. These technologies lead to temporarily or permanently limiting the power of the loudspeaker. 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. For this purpose, the subject of the invention is an acoustic enclosure comprising: an external wall which is non-conductive of heat and defines at least in part a box of the acoustic enclosure; 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, in which the loudspeaker motor and the electronic circuit are connected to the same body member acoustic, the member being heat conducting and having an exchange surface adapted to be traversed by a flow of heat flowing in the member from the motor and the electronic circuit when the acoustic enclosure is in operation, the flow of heat being intended to dissipate in the air outside the acoustic enclosure or to pass in a conductive element of heat outside the acoustic enclosure. According to particular embodiments, 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 loudspeaker chassis; 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; and the outer wall is furthermore fixed on the body, the loudspeaker, the outer wall and the member defining an internal volume that is substantially airtight with respect to the outside air. The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which: FIG. 1 is a diagrammatic sectional view of an acoustic enclosure according to a first embodiment of the invention, - Figure 2 is a schematic sectional view of an acoustic chamber according to a second embodiment of the invention, - Figure 3 is a schematic view of the speaker 2, in section along a plane substantially perpendicular to the section plane of FIG. 2, and FIG. 4 is a diagrammatic sectional view of an acoustic enclosure according to a third embodiment of the invention. Referring to Figure 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). In the example shown, the acoustic enclosure 1 has a generally parallelepipedal general shape. Alternatively (not shown), 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 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 speaker 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. By "thermal bridge" between two pieces, 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. For example, 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. According to variants (not shown), the chassis 44 or the motor 48 are fixed directly on or are in direct contact with the member 15.
    [0007] The chassis 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 loudspeaker 5 around the axis D. For example, 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. 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 speaker 1 is in operation. In the example shown, the member 15 extends inside and across the box 25, for example substantially perpendicular to the axis D of the loudspeaker 5.
    [0008] 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. According to variants (not shown), 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. According to a variant not shown, 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 enclosure 1. The radiator 58 defines an exchange surface 66 able 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. By "conductor" is meant that the member 15 has, at least on the path of the heat flow 68, a conductivity greater than or equal to 1 W / m.K.
    [0009] In the example shown, the outer wall 20 comprises two half-shells 70, 72. By "non-heat conductor" or "thermally insulating" is meant a material having a thermal conductivity at 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. sealing 30, 32, the speaker 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 organ 15 define a second internal volume 78 substantially sealed vis-à-vis the outside air 76. In the example shown, the first internal volume 74 houses the motor 48. The second volume 78 houses the electronic circuit 10. The operation of acoustic enclosure 1 will now be described. The member 15 puts in thermal communication the motor 48, the electronic circuit 10 and the outside air 76. When the acoustic enclosure 1 is in operation, the motor 48 and the electronic circuit 10 give off heat. In steady state, the heat released by the motor 48 passes into the member 15 via the first thermal bridge 40. The heat generated in the electronic circuit 10 passes into the member 15 via the second thermal bridge 42.
    [0010] In the member 15 is created 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 surface exchange 66 to dissipate into the outside air 76. Thanks to the characteristics described above, in particular the member 15, it is possible to extract a large fraction of the heat that emerges in the motor 48 and in the electronic circuit 10, and to evacuate outside the acoustic enclosure 1. Thus, it is possible to prevent excessive heating of the motor 48 or the electronic circuit 10. In addition, at the beginning of the use of the loudspeaker 5 is heated by the electronic circuit 10. In fact, the heat generated by the electronic circuit 10 is driven by the second thermal bridge 42, the member 15 and the first thermal bridge 40 until 'to the motor 48. The m The operator 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. Furthermore, thanks to 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. Advantageously, the member 15 constitutes an internal frame of the acoustic chamber 1, on which the outer wall 20 is fixed in a substantially watertight manner. Referring to Figures 2 and 3, there is described a speaker 100 constituting a second embodiment of the invention. The acoustic enclosure 100 is similar to the acoustic enclosure 1 shown in FIG. 1. The similar elements bear the same reference numerals in FIGS. 2 and 3. Only the differences between the acoustic enclosure 100 and the acoustic enclosure 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 loudspeaker 105 is advantageously structurally analogous to the loudspeaker 5. The second loudspeaker 105 includes a motor 148 clean to release heat when the speaker 100 is in operation. The second speaker 105 is for example disposed on the other side of the member 15 relative to the speaker 5. The motor 148 is connected to the member 15 by a fourth thermal bridge 140.
    [0011] 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. 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. In the example shown, the member 15 occupies a substantially median position in the box 25 in the transverse direction T.
    [0012] The first electronic circuit 10 and the second electronic circuit 110 are for example connected by cables 112.
    [0013] The member 15 of the acoustic enclosure 100 is for example devoid of a radiator extending in an opening defined by the casing 25. The member 15 internally defines a passage 114 through the acoustic enclosure 100. As visible on 3, 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. member 15 advantageously comprises fins 120 projecting into the passage 114. The external air circulation in the passage 114 is shown in Figures 2 and 3 by an arrow F. The exchange surface 66 defined by the member 15 defines passage 114. In a normal position of use of the loudspeaker 100, the inlet 116 is below the outlet 118. The passage 114 is adapted to operate substantially as a chimney.
    [0014] 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 flow of air F. Similarly, a heat flux 168 from the engine 148 and the second electronic circuit 110 passes through the exchange surface 66 to pass into the air flow F. According to a variant not shown, the heat dissipation mode of the acoustic enclosure 100 (chimney) and the heat dissipation mode of the acoustic enclosure 1 (radiator) are combined.
    [0015] Alternatively, the acoustic enclosure 100 comprises a fan (not shown) located in the passageway 114 and adapted to create a forced circulation of outside air in the passageway 144. An acoustic enclosure 200 constituting a third embodiment will now be described. of the invention.
    [0016] The loudspeaker 200 is similar to the loudspeaker 1 shown in Figure 1. The similar elements have identical reference numerals. 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.
    [0017] 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 by the second face 38 of the connecting part 156.
    [0018] When the acoustic enclosure 200 is in operation, part of the heat flow 68 coming from the motor 48 and the electronic circuit 10 is evacuated into the outside air 76 by the second face 38 of the member 15.10.
    权利要求:
    Claims (10)
    [0001]
    1. Acoustic speaker (1; 100; 200) comprising: - an outer wall (20) non-conductive heat and defining at least in part a box (25) of the acoustic enclosure, - at least one loudspeaker Electrodynamic motor (48, 148), the loudspeaker (5, 105) having a peripheral portion (50) fixed to the outer wall (20), and - at least one electronic circuit (10, 110) for controlling the loudspeaker (5, 105), in which the motor (48, 148) of the loudspeaker (5, 105) and the electronic circuit (10, 110) are connected to the same member (15). the acoustic chamber (1; 100; 200), the member (15) being heat conducting and having an exchange surface (66) adapted to be traversed by a heat flux (68, 168) flowing in the member (15) from the motor (48, 148) and the electronic circuit (10, 110) when the acoustic chamber (1; 100; 200) is in operation, the heat flow (68, 168) being destiny to dissipate into the outside air (76) to the speaker (1; 100; 200) or passing through a heat-conducting element outside the loudspeaker (1; 100; 200).
    [0002]
    Acoustic speaker (1; 100; 200) according to claim 1, wherein the motor (48,148) of the loudspeaker (5,105) is attached to the member (15) directly or via a chassis (44) of the loudspeaker (5, 105).
    [0003]
    An acoustic loudspeaker (1; 100; 200) according to claim 1, wherein the loudspeaker motor (48,148) or the electronic circuit (10,110) is or are linked to ) to the member (15) by at least one thermal bridge (40, 42, 140, 142).
    [0004]
    4. Acoustic speaker (1; 200) according to any one of claims 1 to 3, wherein the member (15) comprises a radiator (58) defining at least partly the exchange surface (66), and a connecting portion (56), preferably metal, to which are connected the motor (48) of the speaker and the electronic circuit (10), the connecting portion being connected to the radiator (58) directly or via a thermal bridge (62).
    [0005]
    5. Acoustic speaker (1; 200) according to claim 4, wherein the connecting portion (56) is at least 80% by weight metal.
    [0006]
    6. Acoustic speaker (1; 200) according to claim 4 or 5, wherein the connecting portion (56) extends inside the box (25), preferably across the box 25.
    [0007]
    7. Acoustic speaker (200) according to claim 4 or 5, wherein the connecting portion (56) is located at least partly on the surface of the acoustic chamber (1; 200) so as to form part of the box (25).
    [0008]
    8. Acoustic speaker (100) according to any one of claims 1 to 7, wherein the member (15) internally defines at least one passage (114) through the acoustic chamber (100), the passage (114). ) having at least one inlet (116) for the outside air, and an outlet (118), the passage (114) being adapted to allow a circulation (F) of outside air (76) from the inlet (116) to the outlet (118), and the member 15 preferably including fins (120) to promote the dissipation of the heat flow (68, 168) into the outside air (76) flowing in the passage (114).
    [0009]
    9. An acoustic chamber (100) according to claim 8, comprising a fan for creating a forced circulation of outside air (76) in the passage (114).
    [0010]
    10. Acoustic speaker (1; 100; 200) according to any one of claims 1 to 9, wherein the outer wall (20) is further fixed on the member (15), the loudspeaker (5, 105), the outer wall (20) and the member defining an inner volume (74, 78) substantially sealed against the outside air (76).
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP3085108B1|2018-08-29|
    WO2015091446A1|2015-06-25|
    EP3085108A1|2016-10-26|
    US20160337756A1|2016-11-17|
    US10187728B2|2019-01-22|
    FR3015166B1|2017-07-14|
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    法律状态:
    2015-12-08| PLFP| Fee payment|Year of fee payment: 3 |
    2016-12-06| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-23| PLFP| Fee payment|Year of fee payment: 5 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 7 |
    2020-11-18| PLFP| Fee payment|Year of fee payment: 8 |
    2021-11-18| PLFP| Fee payment|Year of fee payment: 9 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1362924A|FR3015166B1|2013-12-18|2013-12-18|ACOUSTIC SPEAKER COMPRISING AN EXTERNAL NON-CONDUCTIVE HEAT WALL, AN ELECTRODYNAMIC SPEAKER AND AN ELECTRONIC CONTROL CIRCUIT|FR1362924A| FR3015166B1|2013-12-18|2013-12-18|ACOUSTIC SPEAKER COMPRISING AN EXTERNAL NON-CONDUCTIVE HEAT WALL, AN ELECTRODYNAMIC SPEAKER AND AN ELECTRONIC CONTROL CIRCUIT|
    US15/105,809| US10187728B2|2013-12-18|2014-12-16|Acoustic enclosure comprising a non-heat-conducting external wall, an electrodynamic loudspeaker and an electronic control circuit|
    PCT/EP2014/077907| WO2015091446A1|2013-12-18|2014-12-16|Accoustic enclosure comprising a non heat-conducting external wall, an electrodynamic loudspeaker and an electronic control circuit|
    EP14821123.8A| EP3085108B1|2013-12-18|2014-12-16|Accoustic enclosure comprising a non heat-conducting external wall, an electrodynamic loudspeaker and an electronic control circuit|
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