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
  • H04R7/16—Mounting or tensioning of diaphragms or cones
  • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
  • H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands

Definitions

• the present invention relates to a ribbed suspension, a loudspeaker (“HP”) comprising it and an acoustic enclosure comprising it.
• the first field of the invention is therefore the external suspension, or "front” of an electrodynamic loudspeaker or transducer. It applies, in particular, to the field of audio and acoustics, for example to so-called “high-fidelity” or HIFI audio systems.
• the present invention applies, more particularly, to suspensions and loudspeakers for loudspeakers whose closed acoustic load has a low volume compared to the product of the surface of the membrane assembly by its maximum excursion. In other words, it applies to loudspeakers dedicated to making large deflections in comparison to their sizes.
• the external suspension 10 of a loudspeaker is in half-roll as shown in Figure 1 (in perspective) and in Figure 2 (in side view).
• a loudspeaker with this suspension 10 is placed in a small volume of air in a closed enclosure.
• circular lines equidistant from the external support plane of the suspension 10 have been added to help the perception of the half-torus shape of the suspension 10.
• high-fidelity loudspeakers are generally supported by a fixed support intended to orient them towards the listener.
• Other loudspeakers are mounted on wall brackets with two degrees of freedom in rotation, which allow them to be oriented in all directions within a cone of limiting directions.
• These supports are complex and expensive.
• Small-sized acoustic loudspeakers for example called Bluetooth (registered trademark) loudspeakers, from the name of the communication protocol with a source of acoustic signals, in particular a mobile telephone, are supported only by gravity, which limits their positioning capacity. In particular, these enclosures cannot be supported by a vertical wall, for example a wall.
• the present invention aims to remedy all or part of these drawbacks.
• the present invention relates to a suspension according to claim 1.
• this structure with a ridge having a radius of curvature and opening onto the straight line of the outer side of the suspension, has good efficiency in resisting deformations due to the depression inside the enclosure, during the suspension displacements.
• the curvature of the ridge stiffens the outer face, or front, of the suspension and the intersection of the ridge with the outer flank stiffens this outer flank.
• the invention provides a flexible and light suspension which minimizes the mass and the stiffness of the moving assembly of the loudspeaker.
• the present invention makes it possible in particular to overcome the depression phenomenon observed on the suspension and which generates parasitic noises for travels of the suspension greater than those which were authorized with the suspensions known in the prior art.
• the circular part of the edge of the rib has a radius of between 80% and 120% of a radius of at least one said arc of a circle of the general surface of the suspension.
• the ridge comprises a straight line segment connecting its circular part to a straight line segment of the external flank. This straight line of the rib edge increases the angle between that edge and the suspension sidewall line, which increases the stiffness of that sidewall.
• the minimum angle between the sides of the rib, according to a section plane parallel to the axis of symmetry, is between 65 degrees and 105 degrees.
• This arrangement makes it possible to optimize the weight of the suspension while maintaining the desired mechanical properties of resistance to depression.
• the height of the sides of the rib, measured parallel to the axis of symmetry, is between a quarter and a half of the height of the suspension measured from its crown to its top
• the angle formed between the bond line segment and the outer flank straight line segment is between 90 degrees and 135 degrees
• the distance between the lips of two consecutive ribs on the surface having rotational symmetry is less than or equal to the width maximum between the lips of a rib
• the distance between the lips of two consecutive ribs on the surface having rotational symmetry is between one third and two thirds of the maximum width between the lips of a rib
• the maximum width between the lips of a rib is greater than one-fifth of the overall radial extent of at least one arc of a circle in the section of the surface having rotational symmetry by a plane passing through so n axis
• the height of the outer flank straight line segment, measured parallel to the axis of symmetry is between a quarter and the whole of the height of the suspension measured from the crown to the top of the suspension
• the present invention relates to a loudspeaker comprising a suspension which is the subject of the invention.
• the present invention relates to an acoustic enclosure comprising at least one loudspeaker comprising a suspension object of the invention.
• the component of a translation vector of the edge constituting a lip of a rib at the edge away from the surface having rotational symmetry of the rib, in a plane including the axis of symmetry, is oriented towards the part of the axis of symmetry located in the enclosure.
• the present invention relates to an adjustable acoustic loudspeaker which comprises:
• At least one loudspeaker having a first axis of emission of sound waves
• each loudspeaker and comprising a first mechanical interface having rotational symmetry around a second axis not parallel to the first axis
• the direction of the first axis of emission of the sound waves is modified. It is thus possible to choose an orientation with a single degree of freedom in rotation between the support and the shell of the enclosure.
• the first axis of emission of the sound waves can be kept substantially unchanged while modifying the type of support, passing from a support placed on a flat horizontal surface to a wall support.
• one of the mechanical interfaces has at least one bump oriented towards the other mechanical interface and this other mechanical interface has at least one hollow complementary to said bump.
• the rotation of the shell around the support has preferred directions in which each bump is housed in a hollow.
• the first axis and the second axis are coplanar.
• the center of gravity of the shell which is substantially on the first axis, remains substantially at the same distance from the second axis and the stability of the enclosure on the support is maintained substantially constant.
• the acute angle formed between the first axis and the second axis is between 40 and 50 degrees.
• the rotation around the second axis causes the first axis to traverse substantially a right angle.
• the support has a flat base, the sum of the acute angle formed between the first axis and the second axis and the acute angle formed between the second axis and the plane of the flat base of the support is between 80 and 100 degrees.
• the first axis of emission of sound waves can be substantially horizontal.
• the contact surface between the first mechanical interface and the second mechanical interface has the general shape of a truncated cone, a truncated sphere or a truncated torus.
• the return part comprises a coil spring and two parts having, respectively, a thread and a complementary thread, configured to compress the coil spring.
• the restoring force exerted on the interfaces is regularly distributed over their contact surface.
• the return piece bearing the first mechanical interface and the second mechanical interface comprises at least one magnet.
• the shell and the support are held in contact by magnetization, which allows easy dismantling.
• the means for transmitting electrical signals through the mechanical interfaces comprises a light passing through the two interfaces, light through which a cable passes.
• the cable is free to rotate relative to the support, which avoids mechanical stresses which could harm the electrical connections.
• the means for transmitting electrical signals through the mechanical interfaces comprises dry electrical contacts on each of the mechanical interfaces.
• the support has a plane of symmetry, a base perpendicular to this plane of symmetry and an orthogonal projection on this plane of symmetry of general "L" shape, the projection of the base of which forms the horizontal part of this “L”, the plane of the base being perpendicular to the first axis in a particular respective position of the first interface and of the second interface.
• the first axis of emission of sound waves can be horizontal.
• Figure 1 shows, in perspective, a front, or external, suspension of the prior art
• Figure 2 shows, schematically and in side view, the suspension illustrated in Figure 1
• Figure 3 shows, in section, deformations of prior art front suspensions
• Figure 4 shows, in perspective, a particular embodiment of a suspension object of the invention
• FIG 5 shows, in partial top view, the suspension illustrated in Figure 4,
• Figure 6 shows section A-A marked in Figure 5
• FIG. 7 shows section B-B marked in Figure 5
• Figure 8 shows a side view of the suspension illustrated in Figures 4 to 7,
• Figure 9 schematically represents a sectional view of an enclosure comprising the suspension illustrated in Figures 4 to 8,
• FIG. 10 represents, in sections according to two different planes passing through the axis of symmetry of the suspension, the general surface of the membrane illustrated in FIG. 9, apart from the ribs, and the lower edge of the rib illustrated in FIG. ,
• FIG. 11 represents, in axial section, a particular embodiment of an enclosure which is the subject of the fourth aspect of the invention in a configuration placed on a plane,
• Figure 12 shows, in axial section, the enclosure illustrated in figure 11, in a configuration supported by a vertical wall
• Figure 13 shows, enlarged, a circular part, marked "C”, of Figure 11,
• Figure 14 shows, in perspective, a support of the enclosure illustrated in Figures 11 to
• Figure 15 shows, in perspective, part of the shell of the enclosure illustrated in Figures 11 to 14. Description of embodiments of the invention
• the term "height" of an element is the measurement of the orthogonal projection of this element on the axis 36, oriented in the rear to front direction, the origin of this height measurement being the plane of intersection of a bonding line and a straight line on the outer side, a plane perpendicular to the axis of symmetry of the suspension (see description of FIG. 10).
• Figures 4 and 6 to 10 are oriented in the height direction.
• the term “length” of an element is the measurement of the orthogonal projection of this element on a straight line 37 perpendicular to the axis 36 and passing through this element.
• width of an element is the measurement of the orthogonal projection of this element on a straight line 38 perpendicular to the straight line 37 serving as a measure of the length and in a plane perpendicular to the axis 36.
• straight lines 36 and 37 are shown in Figure 4 for length and width measurements of a rib 26.
• a surface exhibiting rotational symmetry is an invariant surface by rotation of a given angle around a fixed axis, here the axis 36.
• this general surface 45 of the suspension 20 also has a symmetry of revolution, that is to say that it is invariant by rotation of any angle around the axis 36.
• the loudspeaker suspension 20 comprises, in a general surface 45 having rotational symmetry about the axis 26, a section through a plane passing by this axis 36, outside the ribs. This section comprises, successively from the farthest to the closest to the axis 36 and connected to each other by angles:
• flank a segment of straight line 22, called "external flank” corresponding to an external flank of the suspension
• this section further comprises an arc of circle 24 continuing the arc of circle 23 and a straight line segment 25 connected to the arc of circle 24.
• the general surface 45 of the suspension 20 also has a symmetry of revolution, in the following description:
• the bonding line segment 21 is part of a crown or a truncated cone of bonding
• the straight line segment 25 is part of a truncated cone.
• the invention adapts to embodiments in which the general surface of the suspension does not have symmetry of revolution, for example a general surface whose orthogonal projection on a plane perpendicular to the axis 36 is polygonal.
• This adaptation by those skilled in the art is easy from the following description, the radial section plane considered to define the line segments 21 to 25, the angle 39 and the vector 32, then being perpendicular to a plus long side of the regular polygon thus defined.
• Crown 21 may be flat as in FIGS. 4 to 10, truncated cone or truncated sphere, for example.
• the surface 45 comprises two truncated toruses 23 and 24.
• the surface having rotational symmetry comprises a single truncated torus. torus or more than two trunks of torus.
• the suspension 20 comprises, as an extension of the truncated torus 24 closest to the axis 36, a truncated cone 25 serving for the connection with the membrane of the top- loudspeaker and, possibly, to the moving part of the loudspeaker motor.
• the suspension 20 object of the invention has multiple reinforcing ribs 26 of general "V" shape (see Figure 8). These ribs 26 are found a large number of times on the periphery of the suspension 20. In this surface 45 having rotational symmetry, is thus formed at least one rib 26, hollow in the volume of at least one truncated torus 23 and 24. At least one rib 26 has:
• this edge 27 comprising a circular part 31 and
• FIG. 10 At the top of Figure 10 is shown a section, by a plane containing the axis 36, of the general shape 45, that is to say the section of the suspension 20 outside the ribs 26.
• the edge 27 opens onto the straight line segment 22 of the external flank, in the central third of this segment, that is to say at a height h41 of between one third and two thirds of the height h22 of the segment 22 and, preferably, at a height h41 of between 40% and 60% of the maximum height h22 of this straight line segment 22.
• the ridge 27 comprises, at its outer end, an outer straight segment 41.
• This straight segment 41 of the ridge 27 is preferably included in a plane perpendicular to the axis 36 of symmetry of the suspension 20 .
• an external straight line segment 41 of edge 27, connects its circular part 31 to the truncated cone 22.
• the height h22 is between a quarter and all of it, preferably between half and three quarters of the maximum height h23 of the suspension; the outer side 22, stiffened approximately in the middle of its height by the end of the edge 27, thus being able to be particularly high compared to the suspensions provided with ribs of the prior art, the maximum height of the edge 27, h31, is between 75% and 125% of the height h22 and preferably between 85% and 110% of the height h22, the edge 27 emerges on the flank line 22 at a height h41 of between a quarter and a half of the maximum height h23 of the suspension 20, the maximum height h31 of the edge 27 is between half and three quarters of the maximum height h23 of the suspension 20, the edge 27 comprises a straight line segment 42 connecting the circular part 31 to the internal flank, in a circular part 24 of the general shape 45 of the suspension 20, thus stiffening this internal flank in the same way as the opposite end of the edge 27 stiffens the external flank
• Each of these characteristics aims to optimize the distribution of forces and points (intersection of lines), line (edges) of rigidity, to resist depression or overpressure of the interior volume of the enclosure on the internal and external sides and on the toroidal part of the suspension 20, during the movement of the speaker membrane.
• This distribution maximizes the capacity of the membrane to accept strong deflections of this membrane.
• the 13 technical features listed above are not reproduced, or are only partly reproduced.
• all of the ribs 26 are identical. In other embodiments, the ribs are different, for example with parallel edges 27 on portions of the suspension or with ribs whose values of their geometric characteristics which alternate between the ribs.
• the edge 27 of at least one rib 26 comprises a circular part 31 having a radius R2 of between 80% and 120%, preferentially between 90% and 110%, and more preferentially between 95% and 105 % of a radius R1 of an arc of circle 23 corresponding to a truncated torus of surface 45.
• the radii R1 and R2 are equal. More specifically, in a section plane parallel to the plane of the edge 27, a circle segment 30 (in broken lines) of a truncated torus (in this embodiment the truncated torus 23) corresponds, by translation d a vector 32, at least a part 31 (in broken lines) of the edge 27. As can be seen in FIG. 7, this is the circular part 31 of the edge 27.
• the arc covered by the circular part 31 represents less than a quarter of a circle and, preferably, approximately one sixth of a circle, that is between 45 degrees and 75 degrees.
• the complete circle 43, a portion of which is covered by the part 31 of the edge 27 is represented, in FIG. 7, in broken lines.
• an internal straight line segment 42 of edge 27 connects its circular part 31 to the truncated core 24.
• the straight line segment 42 reaches the truncated of torus 24 substantially half the height of the assembly of this truncated torus 24 and of the truncated cone 25.
• the truncated torus 23 which has the radius R1 close to or equal to the radius R2 of the edge 27 is the truncated torus 23 which reaches the maximum height, the top, of the suspension 20 (at the top in FIGS. 4 and 6 to 10).
• the vector 32 is preferably oriented towards the interior volume of the enclosure comprising the loudspeaker.
• the component of the vector 32 in a plane including the axis 36 is oriented towards the part of the axis 36 located in the enclosure.
• circle segment 31 is closer to axis 36 than circle segment 30.
• the sides 28 form a constant angle 35 over the entire length of the edge 27, angle measured in a plane:
• this angle 35 which is the minimum angle between the flanks 28 of the rib 26, according to a section plane parallel to the axis of symmetry 36 and comprising the straight line 38, is substantially straight, it that is to say between 65 degrees and 105 degrees, preferably between 75 degrees and 95 degrees.
• the height of the sides 28 of the rib 26, measured parallel to the axis of symmetry 36 is between a quarter and a half, and preferably between a quarter and a half, for example one third of the height of the suspension 26, measured from its crown 21 to its top.
• This height equal to h23 - h31, or depth of the ribs, of the rib 26 influences the ability of the suspension 20 to resist the restoring pressure of the interior volume of the enclosure: the greater this height, the better this ability.
• this height is too great, the suspension 20 can no longer move properly parallel to the axis of the loudspeaker, which then reduces the operating range of the loudspeaker at low frequencies. This height remains the same over a large part of the rib 26, which avoids a straight cut through the suspension 20, a cut which could cause problems during the physical molding of the material constituting the suspension 20.
• the obtuse angle 39 formed between the plane perpendicular to the axis 36 and the truncated cone 22 which joins the crown 21 is between 90 degrees and 135 degrees and, even more preferably, between 90 degrees and 110 degrees.
• the lips 29 of the rib 26 are the connecting edges between the sides 28 of this rib 26 and the surface 45.
• the distance 34 between the lips 29 of two consecutive ribs 26 on the surface 45 is less than or equal to the maximum width 33 between the lips 29 of a rib 26 and preferably substantially equal to half of this maximum width 33.
• the maximum width 33 between the lips 29 of a rib 26 is greater than one fifth of the radial extension (or length) of the set of truncated cores 23 and 24 and one quarter the length of a rib 26.
• the height of the truncated cone 22 touching the crown 21, measured parallel to the axis 36 of the surface 45, is between a quarter and the entire height of the suspension measured from crown 21 at the top of the suspension.
• the edges 27 are radial, that is to say that the plane which contains an edge 27 passes through the axis 36.
• the planes of the edges form, in their middle, an equal angle with a plane passing through the axis 36 of the suspension 20 and through the middle of the edges.
• the invention adapts to embodiments in which the general surface of the suspension does not have symmetry of revolution, for example a general surface whose orthogonal projection on a plane perpendicular to the axis 36 is polygonal.
• This adaptation by those skilled in the art is easy from the following description, the radial section plane considered to define the line segments 21 to 25, the angle 39 and the vector 32, then being perpendicular to a plus long side of this polygon.
• the suspension has a general surface possessing rotational symmetry around an axis 36, the section of which by a plane passing through this axis comprises, successively from furthest to closest to the axis and connected between them :
• the rib 26 has:
• the angle 39 formed between the line segment 21 corresponding to the bonding zone and the straight line segment 22 which is connected to it in the section of the surface having rotational symmetry by a plane passing through its axis 36 is between 90 degrees and 135 degrees; d) in embodiments, the maximum width 33 between the lips 29 of a rib 26 is greater than one fifth of the radial extension of the assembly 23 and 24 by at least one arc of a circle in the section of the surface 45 by a plane passing through its axis 36; e) in embodiments, the height of the straight line segment 22 which is connected to the line segment 21 corresponding to the bonding zone in the section of the surface 45 by a plane passing by its axis 36, measured parallel to this axis 36, is between a quarter and the entire height of the suspension measured from the crown to the top of the suspension; and f) in embodiments, the height of the straight line segment 22 which is connected to the line segment 21 corresponding to the bond
• the suspension is thermoformed and resin-impregnated fabric or foam. This method of manufacture makes it possible not to modify the mass of the suspension, compared to a suspension which would not have a rib, while increasing its resistance to deformation under the effect of the depression inside the 'pregnant.
• FIG. 9 schematically represents a loudspeaker 40 comprising a suspension 20 which is the subject of the invention and an enclosure 50 comprising the loudspeaker 40.
• the present invention applies in particular to loudspeaker suspensions whose acoustic load closes has a volume less than ten times the product of the area of the membrane assembly times its maximum excursion.
• the suspension 20 is thus integrated with a loudspeaker 40 dedicated to supporting, without acoustic distortion, large deflections in comparison with its size.
• This loudspeaker 40 is inserted in a closed enclosure 50.
• the improvement in the resistance to depression of an interior volume of a given enclosure is as follows:
• Suspension object of the invention 4.5 mm displacement for a slight suction to form.
• the invention makes it possible to use a flexible and light material.
• the invention makes it possible to use this material when the loudspeaker is loaded by a small enclosed volume (compared to its size).
• the invention makes it possible to use thermoformable or injection moldable materials.
• the invention slightly increases the mechanical stiffness of the suspension as it is usually measured on a loudspeaker (Kms).
• the invention makes it possible to have a linear stiffness as a function of displacement (Kms(x)), in its operating range.
• Figures 11 to 15 are to scale, even if they may be at different scales.
• an adjustable acoustic enclosure 60 which comprises at least one loudspeaker 74 having a first axis of emission of sound waves 63. It is noted that the enclosure 60 can thus comprise a single top loudspeaker or several coaxial loudspeakers.
• the enclosure 60 also includes a shell 62 including each loudspeaker 74.
• the shell 62 also includes a first mechanical interface 65 having rotational symmetry about a second axis 64 not parallel to the first axis 63.
• a support 61 has a second mechanical interface 66 complementary to the first mechanical interface 65.
• a means 68, 69 and 70 for transmitting electrical signals through the mechanical interfaces 65 and 66 comprises, in this embodiment, parts 68 and 69 , described later, surrounding a through-light along the second axis 64 and a cable 70 which runs through this through-light.
• the parts 68 and 69 thus form a passage, 68 and 69, of cable 70 passing through the mechanical interfaces 65 and 66 along the second axis 64.
• a return part 67 supports the first mechanical interface 65 and the second mechanical interface 66 .
• the first axis 63 of wave emission can be maintained substantially unchanged. sound waves while modifying the type of support 61, passing from a support 61 placed on a flat horizontal surface (FIG. 11) to a wall support on a vertical wall 73 (FIG. 12).
• the contact surface between the first mechanical interface 65 and the second mechanical interface 66 has the general shape of a truncated cone. In other embodiments (not shown), this contact surface has the general shape of a truncated sphere, a truncated torus or any other surface of rotation, or even of revolution, around the second axis 64.
• this general contact surface of the mechanical interfaces also has a symmetry of revolution, that is to say that it is invariant by rotation of any angle around the second axis 64.
• one of the mechanical interfaces here the second mechanical interface 66, has at least one bump 76 oriented towards the other mechanical interface, here the first mechanical interface 65, and this other mechanical interface 65 has at least one hollow 75 of complementary shape to said bump 76.
• it is the first mechanical interface, of the shell, which has at least one bump and it is the second mechanical interface which has at least one hollow of complementary shape to said bump.
• eight depressions 75 and eight bumps 76 are implemented.
• the number of pits is greater than the number of bumps.
• the bumps form, at their intersection with the general shape of the mechanical interface which carries them, an angle preferably greater than 90 degrees, for example 135 degrees, so that the passage, by rotation of the shell 62 around the axis 64 , from a bump 76 to the next hollow is facilitated.
• the return piece 67 maintains each bump 76 in a hollow 75 in the absence of manual effort on the mechanical interfaces.
• the respective rotational position of the mechanical interfaces is maintained by the return piece 67.
• the presence of the bumps 76 and the hollows 75 nevertheless ensures comfort of use by assisting the user in his search for such a respective position of the shell 62 and of the support 61.
• the rotation of the shell 62 around the support 61 has preferred directions in which each bump 76 is housed in a hollow 75.
• the first axis and the second axis are coplanar (in the cutting plane of FIGS. 11 and 12), which gives enclosure 60 a plane of symmetry in the configurations illustrated in FIGS. 11 and 12.
• the acute angle formed between the first axis 63 and the second axis 64 is between 40 and 50 degrees.
• the rotation around the second axis causes the first axis to traverse substantially a right angle.
• the return part 67 comprises a coil spring and two parts 68 and 69 having, respectively, an internal thread and a complementary thread (both referenced 71), configured to compress the coil spring .
• the part 69 being integral with the first mechanical interface 65, once the cable 70 has passed successively through this part 69, into the second interface 66, into the coil spring 67 and into part 68, the assembly of the support 61 on the hull 62, the positioning of the passage of the cable 70 and the compression of the spring 67 are carried out simultaneously, by rotating the thread of the part 68 on the thread of the part 69.
• the part 68 and 69 of the passage of the cable 70 comprises a smooth internal wall 72 through which the cable 70 passes and the cable has an external diameter smaller than the internal diameter of this smooth wall 72.
• the cable 70 is thus free to rotate relative to the support 61, which avoids mechanical stresses which could harm the electrical connections.
• the return piece comprises a flexible elastic blade, for example metallic or elastomer.
• the return piece resting the first mechanical interface and the second mechanical interface comprises at least one magnet (not shown).
• the means for transmitting electrical signals through the mechanical interfaces 65 and 66 comprises parts 68 and 69, which surround a light passing through along the second axis 64 and a cable 70, which runs through this through light.
• the means for transmitting electrical signals through the mechanical interfaces comprises an axial connector.
• the electrical signal transmission means comprises dry electrical contacts positioned opposite each other on the two mechanical interfaces 65 and 66, in each of a plurality of orientations of the mechanical interfaces 65 and 66 around of the second axis 64. For example, the electrical signals pass through the bumps 76 and the hollows 75.
• bumps 76 and hollows 75 are dedicated to signals of a first polarity and positioned at a first distance from the second axis 64.
• Other bumps 76 and other hollows 75 are dedicated to signals of a second polarity and positioned at a second distance, strictly greater than the first distance, from the second axis 64.
• the support 61 has a plane of symmetry (the cutting plane of Figures 11 and 12), a base 77 perpendicular to this plane of symmetry, and an intersection with this plane of symmetry of general “L” shape, visible in FIGS. 11 and 12, the projection of the base 77 of which forms the horizontal part of this “L”.
• the plane of the base 77 is substantially perpendicular to the first axis 63 in a particular respective position (illustrated in FIG. 12) of the first interface 65 and of the second interface 66.
• the sum of the acute angle formed between the axes 63 and 64 and the acute angle formed between the axis 64 and the plane of the base 77 is equal to 90 degrees, for example to within plus or minus 10 degrees.
• the acute angle formed between the axes 63 and 64 is less than 45 degrees, for example 43 degrees, and the acute angle formed between the axis 64 and the plane of the base 77 is greater than 45 degrees, for example 47 degrees.
• the first axis 63 of sound wave emission can be horizontal, as illustrated in figure 12.
• an enclosure object of the third aspect of the invention implements the technical features of the fourth aspect of the invention.

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• Engineering & Computer Science (AREA)
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• Physics & Mathematics (AREA)
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• Diaphragms For Electromechanical Transducers (AREA)

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• 2022
  • 2022-07-21 WO PCT/EP2022/070553 patent/WO2023001990A1/fr active Application Filing
  • 2022-07-21 EP EP22755134.8A patent/EP4356625A1/de active Pending

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