Acoustic unit for a sound transducer unit

Abstract

The invention relates to an acoustic unit (1) for a sound transducer unit (2), in particular for a flat loudspeaker, preferably for a magnetostatic loudspeaker, for generating and / or detecting sound waves with a diaphragm (3) and with a coil arrangement (4) coupled to the diaphragm (3), which comprises at least one electrical conductor (7), wherein the at least one electrical conductor (7) comprises conductor sections (8) in at least a first and a second conductor layer (5, 6), and wherein the first and second conductor layers (5, 6) are arranged one above the other. According to the invention, at least some conductor sections (8) of different conductor layers (5, 6) have an overlapping section (9) in which the conductor sections (8) of the different conductor layers (5, 6) overlap.

Description

[0001] The present invention relates to an acoustic unit for a sound transducer unit, in particular for a flat loudspeaker, preferably for a magnetostatic loudspeaker, for generating and / or detecting sound waves with a membrane and with a coil arrangement coupled to the membrane, which comprises at least one electrical conductor, wherein the at least one electrical conductor comprises conductor sections at least in a first and a second conductor layer, and wherein the first and second conductor layers are arranged one above the other.

[0002] JP 2000-345369 A discloses an acoustic unit with a coil arrangement.

[0003] The object of the present invention is to provide an acoustic unit with a coil arrangement for a sound transducer unit with which higher electromagnetic forces can be enabled.

[0004] The problem is solved by an acoustic unit, a sound transducer unit, a coil arrangement and the use of a coil arrangement and the acoustic unit with the features of the independent patent claims.

[0005] An acoustic unit for a sound transducer unit, in particular for a flat loudspeaker, preferably for a magnetostatic loudspeaker, for generating and / or detecting sound waves is proposed.

[0006] The acoustic unit comprises a membrane. The membrane can be deflected to generate the sound waves. Additionally or alternatively, the membrane can also be deflected by the sound waves so that it can detect the sound waves. Furthermore, the acoustic unit comprises a coil arrangement coupled to the membrane, which comprises at least one electrical conductor, wherein the at least one electrical conductor comprises conductor sections in at least a first and a second conductor layer. The electrical conductor can be subjected to an electrical signal that forms an electrical current in the electrical conductor. If the acoustic unit is arranged in a permanent magnetic field of the sound transducer unit, this leads to a deflection of the membrane due to the Lorentz force, so that the sound waves are generated according to the electrical signal.If, however, the membrane is deflected by incoming sound waves, the electrical conductor moves in the permanent magnetic field, inducing an electrical voltage or signal. This allows the sound waves to be detected.

[0007] Furthermore, the first and second conductor layers are arranged one above the other.

[0008] In addition, at least some conductor sections of different conductor layers have an overlap section in which the conductor sections of the different conductor layers overlap.

[0009] Furthermore, it is advantageous if the at least one electrical conductor is arranged in the at least two conductor layers in such a way that the electrical currents in the respective conductor sections overlapping in a common overlapping section are oriented parallel and / or in the same direction. This leads to a higher Lorentz force. This can amplify the deflection when generating the sound waves.

[0010] An advantage results when the conductor sections in the covering sections and / or the conductor layers are arranged one above the other in a normal direction of the coil arrangement and / or the acoustic unit.

[0011] It is advantageous if the conductor sections overlap in the transverse and / or longitudinal directions of the coil arrangement. Additionally or alternatively, it is useful if the overlapping sections extend in the transverse and / or longitudinal directions of the coil arrangement.

[0012] It is beneficial if the conductor sections are straight and / or curved, in particular circular.

[0013] It is advantageous if several, in particular at least two, preferably at least four, particularly preferably fewer than 20 or fewer than 30, conductor sections arranged in a conductor layer together form a conductor section group, wherein the conductor layers preferably comprise several conductor section groups. This allows the electrical current to flow over a large area in the conductor layers. As a result, the membrane can be deflected over a large area. A conductor section group can thus comprise between two and 20 or 30 conductor sections arranged side by side and preferably parallel to one another.

[0014] It is advantageous if a conductor section spacing and / or a conductor group spacing between two adjacent conductor sections and / or conductor section groups is less than 1 mm. Additionally or alternatively, it is advantageous if the conductor section spacing and / or the conductor group spacing is equal to or smaller, in particular between 5% and 75% smaller, than a magnet element width of a magnet element of the sound transducer unit. Additionally or alternatively, the conductor section spacing and / or the conductor group spacing can also correspond to between 25% and 75% or 90% of the magnet element width. If the acoustic unit is intended to be arranged in the sound transducer unit or between two magnet units arranged one above the other, the area between two adjacent conductor sections and / or conductor section groups can be arranged below or above a magnet element. In the area below orAbove a magnetic element, the magnetic field formed is weakest or even disappears, so that in these areas the conductor sections and / or conductor section groups are not very effective.

[0015] It is advantageous if a conductor section width of the conductor sections and / or a conductor group width of the conductor section groups in the transverse direction is equal to or greater, in particular 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50% greater, than an intended magnetic element spacing and / or a width of a free space in the transverse direction between two magnetic elements directly following one another in the transverse direction. As a result, the conductor sections and / or the conductor section groups protrude at least partially in the transverse direction into the area of ​​the magnetic elements. As a result, the conductor sections and / or the conductor section groups with the magnetic elements have conductor-magnetic element overlap sections. This can increase the effectiveness of the deflection.

[0016] It is advantageous if the at least one electrical conductor is arranged such that the conductor sections are arranged in series. This allows the electrical current to flow sequentially through the conductor sections.

[0017] It is advantageous if the at least one electrical conductor is arranged in such a way that the electrical current flowing therein can be guided, in particular several times, alternately in the first and in the second conductor layer.

[0018] An advantage results when several conductor sections and / or conductor section groups are arranged next to one another in the at least first and / or second conductor layer, in particular in the transverse direction, and the electrical conductor is arranged such that in these adjacently arranged conductor sections and / or conductor section groups, a current direction is alternately oriented opposite to one another. This makes it possible to ensure that the Lorentz forces acting on the conductor sections and / or conductor section groups are each aligned in the same direction.

[0019] It is advantageous if the electrical conductor is arranged in a meandering pattern. This allows the electrical current to flow alternately in opposite directions through the electrical conductor.

[0020] An improvement results when two and ten or 20, in particular four, overlapping sections are arranged next to one another in the transverse direction of the coil arrangement.

[0021] It is useful if the electrical conductor is arranged in such a way that the electrical currents flowing in the conductor sections of a conductor section group are oriented parallel to one another and / or in the same direction.

[0022] An improvement results if the electrical conductor is arranged such that the electrical currents of the conductor sections of two groups of conductor sections, especially those directly adjacent to each other, are oriented antiparallel and / or opposite to each other. As a result, the Lorentz forces are oriented in the same direction.

[0023] It is useful if the at least one electrical conductor comprises connecting sections that electrically connect the conductor sections of a conductor layer to one another.

[0024] An advantage results when the at least one electrical conductor comprises contacting sections that electrically connect the conductor sections of different conductor layers to one another.

[0025] It is advantageous if the connecting sections exhibit mirror symmetry along a mirror line, so that a connecting section of one conductor layer is mapped onto a connecting section of the other conductor layer. The connecting sections are thus arranged, designed, and / or routed such that they exhibit this mirror symmetry along the mirror line. With this mirror symmetry along the mirror line, the current direction in the mutually mirrored connecting sections is reversed upon mirroring. This results in an advantageous and space-saving arrangement of the electrical conductor. Furthermore, this easily ensures that the electrical currents in the conductor sections that together have an overlap section are oriented parallel to one another and / or in the same direction and / or in the same direction. This mirror symmetry naturally only applies to the connecting sections that have a mirror partner.

[0026] Furthermore, it is advantageous if the connecting sections cross intermediate regions of the conductor sections and / or of the conductor section groups. The intermediate regions are each arranged between two adjacent conductor sections. Additionally or alternatively, the intermediate regions can also be arranged between two adjacent conductor section groups. Additionally or alternatively, it is advantageous if the connecting sections cross magnetic elements of a magnetic unit of the sound transducer unit when the acoustic unit is arranged in the sound transducer unit. This reduces the disruptive influence of the electric current in regions outside the conductor sections.

[0027] Furthermore, it is advantageous if the connecting sections are arranged in areas outside the magnetic elements in a longitudinal direction. In the area outside or next to the magnetic elements, their permanent magnetic field weakens, so that the electric current in the connecting sections interacts only weakly with the permanent magnetic field. The connecting sections thus protrude beyond the respective ends of the magnetic elements.

[0028] An improvement results when the electrical conductor is printed using a 3D printing process. This allows the acoustic unit to be formed easily.

[0029] Furthermore, it is advantageous if the acoustic unit, in particular the coil arrangement, is manufactured using a lithography process for semiconductor technology. This allows the coil arrangement to be manufactured with very small structures and with very tight tolerances. The coil arrangement can also be arranged on the, in particular flexible, membrane and / or connected to it. For example, the coil arrangement can be glued to the membrane.

[0030] It is advantageous if the coil arrangement is deformation-resistant. This allows the coil arrangement to be deflected as a unit and not deform, so that the electrical currents are guided and remain directed between the magnetic elements in a targeted manner and with a small tolerance. Deformations of the coil arrangement could lead to the electrical currents being guided where they should not be and / or to the occurrence of acoustically detrimental movements of the membrane and / or the acoustic units.

[0031] It is also advantageous if the coil arrangement and / or at least one of the two conductor layers, in particular both conductor layers, is formed from a silicon substrate material. The electrical conductor can then be incorporated into the conductor layers. This combines the manufacturing process using semiconductor technology with deformation resistance. The coil arrangement can, for example, have a thickness of 50 µm.

[0032] It is advantageous if the membrane is flexible. This allows the membrane to deflect, while the coil assembly remains rigid and / or deformation-resistant.

[0033] According to an advantageous development of the invention, it is useful if the coil arrangement is connected to the membrane and / or that the electrical conductor is formed with the membrane, in particular printed into a membrane material.

[0034] It is advantageous if the coil arrangement, in particular the electrical conductor, is embedded in the membrane and / or surrounded by the membrane material. This allows a firm connection to be formed between the coil arrangement or electrical conductor and the membrane.

[0035] It is beneficial to have an insulating layer between the conductor layers. This allows the electrical current to be conducted through the conductor sections in the intended manner.

[0036] It is advantageous if the acoustic unit has a first and / or second protective layer. This can protect the electrical conductor from oxidation, for example.

[0037] Also proposed is a sound transducer unit, in particular a flat loudspeaker, preferably a magnetostatic loudspeaker, for generating and / or detecting sound waves.

[0038] The sound transducer unit comprises at least one magnet unit comprising a plurality of magnetic elements. A permanent magnetic field can be formed using the at least one magnet unit. The sound transducer unit preferably comprises at least two magnet units, each magnet unit preferably comprising a plurality of magnetic elements.

[0039] The sound transducer unit comprises at least one acoustic unit, wherein the acoustic unit is designed according to one or more features of the preceding and / or following description. The acoustic unit is advantageously arranged in the permanent magnetic field of the at least one magnet unit. The acoustic unit comprises at least one electrical conductor to which an electrical current can be applied. When the electrical current flows through the electrical conductor, the Lorentz force is generated in the permanent magnetic field, so that the membrane is deflected and the sound waves are generated. If, however, the membrane is deflected together with the electrical conductor, an electrical voltage is induced. The sound waves can thus be detected.

[0040] Also proposed is a coil arrangement for an acoustic unit and / or for a sound transducer unit having at least one feature of the preceding and / or following description.

[0041] Also proposed is a use of a coil arrangement, which in particular has at least one feature and one feature relating to the coil arrangement from the preceding and / or subsequent description. The coil arrangement is designed for an acoustic unit according to one or more features of the preceding and / or subsequent description.

[0042] The acoustic unit is designed according to the previous description, whereby the features mentioned can be present individually or in any combination.

[0043] Also proposed is a use of an acoustic unit having at least one feature of the preceding and / or following description for a coil arrangement and / or a sound transducer unit designed according to one or more of the features mentioned in the preceding and / or following description.

[0044] Further advantages of the invention are described in the following exemplary embodiments. They show: Figure 1 a lateral cross-section through a schematic sound transducer unit with two magnet units and one acoustic unit, Figure 2 a lateral cross-section through a schematic acoustic unit with two conductor layers and one electrical conductor, Figure 3 a top view of a schematic acoustic unit with an electrical conductor Figure 4 a perspective view of an electrical conductor in two conductor layers and with several conductor sections Figure 5aa plan view of a circular electrical conductor in a first conductor layer, Figure 5b a plan view of a circular electrical conductor in a second conductor layer, Figure 6a a sectional view along the section plane AA from the Figure 3 , Figure 6b a sectional view along the section plane BB from the Figure 3 and Figure 7 Figure 4 with only the most important reference symbols and with the mirror line.

[0045] Figure 1shows a lateral cross-section through a schematic sound transducer unit 2 with two magnet units 14, 15 and an acoustic unit 1. The acoustic unit 1 further comprises a membrane 3 and a coil arrangement 4. Sound waves can be generated and / or detected using the sound transducer unit 2. The sound transducer unit 2 can be, for example, a flat panel loudspeaker or, preferably, a magnetostatic loudspeaker. Sound waves can be generated and / or detected using the acoustic unit 1 or the sound transducer unit 2.

[0046] With the help of the two magnet units 14, 15 shown here, a permanent magnetic field 23 can be formed that acts on the acoustic unit 1. Furthermore, the acoustic unit 1 is arranged in the permanent magnetic field 23. According to the present embodiment, the acoustic unit 1 is also arranged between the two magnet units 14, 15.

[0047] According to the present exemplary embodiment, the magnet units 14, 15 each further comprise a plurality of magnet elements 16-21. These magnet elements 16-21 each have a magnetization direction 22, so that the permanent magnetic field 23 is formed. For the sake of clarity, only one magnetization direction 22 is provided with a reference numeral. Since the first magnet unit 14 is arranged above and the second magnet unit 15 is arranged below the acoustic unit 1, the three magnet elements 16-18 are also arranged above and the three magnet elements 19-21 are arranged below the acoustic unit 1. The acoustic unit 1 is arranged between the magnet elements 16-21.

[0048] Furthermore, as can be seen here, the two magnet units 14, 15 are offset from one another such that the magnet elements 16-21 of one magnet unit 14, 15 are arranged between the magnet elements 16-21 of the other magnet unit 14, 15. Furthermore, as can be seen here, a free space 26 can be arranged between a magnet element 16-21 of one magnet unit 14, 15 and the adjacent magnet element 16-21 of the other magnet unit 14, 15 in the transverse direction 10. For the sake of clarity, only one free space 26 is provided with a reference symbol.

[0049] The coil arrangement 4 further comprises at least one electrical conductor 7 to which an electrical signal can be applied. This allows an electrical current 13 to be generated in the electrical conductor 7. The electrical current 13 is also shown here. The electrical current 13 in the permanent magnetic field 23 generates the Lorentz force, so that the acoustic unit 1 and consequently the membrane 3 are deflected along a stroke axis 25. This allows sound to be generated, so that the sound transducer unit 2 is operated as a loudspeaker. If, on the other hand, the membrane 3 is deflected along the stroke axis 25 due to incoming sound, an electrical voltage is induced in the electrical conductor 7, which voltage can be measured. This allows the sound waves to be detected, so that the sound transducer unit 2 is operated as a microphone.

[0050] Furthermore, the electrical conductor 7 comprises at least one conductor section 8. The electrical conductor 7 of the present embodiment comprises a plurality of conductor sections 8, wherein only one conductor section 8 is provided with a reference symbol. The conductor sections 8 are preferably arranged in the sound transducer unit 2 in the regions of the free spaces 26. In the region of the free spaces 26, the permanent magnetic field 23 is most advantageously designed for the deflection of the membrane 3. In the transverse direction 10 of the acoustic unit 1 or sound transducer unit 2, the conductor sections 8 are preferably arranged next to the magnetic elements 16-21 and / or between the magnetic elements 16-21. In the conductor sections 8, the electrical current 13 can flow in the permanent magnetic field 23 and preferably perpendicular to the permanent magnetic field 23.

[0051] Furthermore, a normal direction 11 is shown here, which is oriented parallel to the stroke axis 25. A longitudinal direction 12 is also shown. The conductor sections 8 are advantageously aligned in the longitudinal direction 12. Furthermore, the previously described transverse direction 10 is also shown here.

[0052] In Figure 1 Also shown is a magnetic element spacing 43 between two magnetic elements 16-21 arranged consecutively in the transverse direction 10. As can be seen, the magnetic element spacing 43 is defined between two magnetic elements 16-21 arranged consecutively in the transverse direction 10, which are arranged in different magnet units 14, 15.

[0053] Furthermore, the conductor sections 8 have a conductor section width 39. For the sake of simplicity, only one conductor section 8 is labeled with the conductor section width 39. According to the present exemplary embodiment, the conductor section width 39 is such that it borders the adjacent magnetic elements 16, 19 laterally or in the transverse direction 10. According to the present exemplary embodiment, the conductor section width 39 is as large as the magnetic element spacing 43 between two magnetic elements 16-21 that are immediately adjacent in the transverse direction 10. These two magnetic elements 16-21 that are immediately adjacent in the transverse direction 10 are also arranged in two different magnet units 14, 15. Additionally or alternatively, the conductor section width 39 can also be larger, for example between 5% and 50%, than the magnetic element spacing 43 between two magnetic elements 16-21 that are immediately adjacent in the transverse direction 10.As a result, the conductor sections 8 extend in the transverse direction 10 into the area of ​​the magnetic elements 16-21. The conductor sections 8 thus have a conductor-magnetic element overlap section with the magnetic elements 16-21. This can improve the effectiveness of deflecting the acoustic unit 1 or the membrane 3. Additionally or alternatively, the conductor section width 39 can be larger, for example, 5%-50%, than the width of the free space 26.

[0054] Furthermore, as can be seen here, the acoustic unit 1 is arranged between the two superimposed magnet units 14, 15 in such a way that an intermediate region 45 between the conductor sections 8 and / or the conductor section groups 33 explained below is arranged above and / or below the associated magnetic elements 16-21 in the normal direction 11. In this region above or below the magnetic elements 16-21, the magnetic field 23 is weak or disappears, so that the conductor sections 8 and / or conductor section group 33 have only a low effectiveness there. For the sake of clarity, only one intermediate region 45 is provided with a reference numeral. The acoustic unit 1 can have several intermediate regions 45. The intermediate regions 45 extend in the transverse direction 10 and / or in the longitudinal direction 12. The intermediate regions 45 can be formed so that the conductor sections 8 are arranged next to one another and / or parallel in the transverse direction 10.An intermediate region 45 is arranged between two adjacent conductor sections 8.

[0055] Features that have already been described in at least one previous figure cannot be explained again for the sake of simplicity. Furthermore, features can also be described in this or in at least one of the subsequent figures. Furthermore, for the sake of simplicity, the same reference symbols are used for the same features. Moreover, for the sake of clarity, not all features can be shown in the following figures and / or provided with a reference symbol. However, features shown in one or more of the previous figures can also be present in this or in one or more of the subsequent figures. Furthermore, for the sake of clarity, features can also be shown and / or provided with a reference symbol in this or in one or more of the subsequent figures.Nevertheless, features which are only shown in one or more of the subsequent figures may already be present in this or a previous figure.

[0056] Figure 2 shows a lateral cross-section through a schematic acoustic unit 1 with two conductor layers 5, 6, the electrical conductor 7 and several conductor sections 8a - 8j.

[0057] Here, several conductor sections 8a-8j are shown. The electrical conductor 7 comprises the several conductor sections 8a-8j. The conductor sections 8a-8j extend in the longitudinal direction 12 and / or are spaced apart from one another in the transverse direction 10. The electrical current 13 can flow in each conductor section 8a-8j.

[0058] Furthermore, the acoustic unit 1 comprises at least two conductor layers 5, 6, which are arranged one above the other, in particular in the normal direction 11. The conductor sections 8a-8j are arranged in each of the at least two conductor layers 5, 6. In this exemplary embodiment, the first, second, third, fourth, and fifth conductor sections 8a-8e are arranged in the first conductor layer 5. The sixth, seventh, eighth, ninth, and tenth conductor sections 8f-8j are arranged in the second conductor layer 6.

[0059] In addition, at least some conductor sections 8a-8j of different conductor layers 5, 6 have an overlap section 9a-9e in which conductor sections 8a-8j of the different conductor layers 5, 6 overlap. In the overlap sections 9a-9e, at least two conductor sections 8a-8j overlap, namely, in particular, one conductor section 8a-8j of each conductor layer 5, 6.

[0060] In the example, the Figure 2 the first and sixth conductor sections 8a, 8f and have the first overlap section 9a. Furthermore, in the embodiment of the Figure 2 The second and seventh conductor sections 8b, 8g overlap and form the second overlap section 9b. The third and eighth conductor sections 8c, 8h overlap and form the third overlap section 9c. The fourth and ninth conductor sections 8d, 8i overlap and form the fourth overlap section 9d. The fifth and tenth conductor sections 8e, 8j overlap and form the fifth overlap section 9e.

[0061] The overlapping sections 9a-9e are arranged or formed between the corresponding conductor sections 8a-8j. In the corresponding overlapping sections 9a-9e, the corresponding conductor sections 8a-8j are spaced apart from one another in the normal direction 11, which is oriented parallel to the lifting axis 25. The overlapping sections 9a-9e also extend in the transverse direction 10 and in the longitudinal direction 12 and are arranged in these two directions 10, 12 between the corresponding, superimposed conductor sections 8a-8j.

[0062] Furthermore, the electrical currents 13 are shown in the respective conductor sections 8a-8j. For the sake of clarity, not all electrical currents 13 in the conductor sections 8a-8j are provided with a reference symbol.

[0063] As can be seen further here, in the first and sixth conductor sections 8a, 8f, which have the common first covering section 9a, the electrical currents 13 are oriented parallel to one another and, in this view, flow out of the plane of the drawing. In the second and seventh conductor sections 8b, 8g, which have the common second covering section 9b, the electrical currents 13 are oriented parallel to one another and, in this view, flow into the plane of the drawing. In the third and eighth conductor sections 8c, 8h, which have the common third covering section 9c, the electrical currents 13 are oriented parallel to one another and, in this view, flow out of the plane of the drawing. In the fourth and ninth conductor sections 8d, 8i, which have the common fourth covering section 9d, the electrical currents 13 are oriented parallel to one another and, in this view, flow into the plane of the drawing.In the fifth and tenth conductor sections 8e, 8j, which have the common fifth covering section 9e, the electrical currents 13 are oriented parallel to each other and flow out of the plane of the drawing in this view.

[0064] It is therefore advantageous if, in the respective conductor sections 8a - 8j, which have a common overlap section 9a - 9e, the electrical currents 13 in the corresponding conductor sections 8a - 8j are parallel to one another. Furthermore, it is advantageous if, in the respective conductor sections 8a - 8j, whose overlap sections 9a - 9e are arranged in the transverse direction 10, in particular directly next to one another, the electrical currents 13 flowing therein are oriented opposite to one another. This means that the electrical currents 13 in the conductor sections 8a - 8j, whose overlap sections 9a - 9e are arranged in the transverse direction 10, in particular directly and preferably next to one another, flow alternately in one direction and in the opposite direction. Thus, the electrical currents 13 flow, as shown in the Figure 2shown, in the conductor sections 8a - 8j in one covering section 9a - 9e out of the plane of the drawing and in the conductor sections 8a - 8j of the covering section 9a - 9e following in the transverse direction 10 into the plane of the drawing.

[0065] Furthermore, the membrane 3 of the acoustic unit 1 is shown here. The Lorentz force acting on the electrical conductor 7 in the permanent magnetic field 23 also deflects the membrane 3. The membrane 3 can have a membrane material 27. The electrical conductor 7 with the conductor sections 8a-8j is coupled to the membrane 3. For example, the electrical conductor 7 can be glued to the membrane 3 or the membrane material 27. It is particularly advantageous if the electrical conductor 7 is printed onto the membrane 3 or the membrane material 27 using a 3D printing process. In addition to or as an alternative to the electrical conductor 7, the membrane material 27 can also be printed using the 3D printing process.

[0066] The coil arrangement 4 further comprises at least one contacting section 29, which electrically connects the conductor sections 8a-8j of the various conductor layers 5, 6, in particular those arranged one above the other. Additionally or alternatively, the at least one contacting section 29 can also be printed using the 3D printing process.

[0067] Likewise, the acoustic unit 1 shown here comprises an insulating layer 28, which is arranged between the two conductor layers 5, 6 and / or electrically insulates the two conductor layers 5, 6 from each other. As a result, the conductor sections 8a, 8j of the respective conductor layers 5, 6 are electrically insulated from each other. The conductor sections 8a, 8j of the respective conductor layers 5, 6 are then electrically connected to each other only by means of the at least one contact section 29.

[0068] It is advantageous if, as shown in this exemplary embodiment, the acoustic unit 1 has at least one protective layer 30, 31. The electrical conductor 7 or the conductor sections 8a-8j can be protected with the aid of the at least one protective layer 30, 31. Two protective layers 30, 31 are shown here, namely one protective layer 30, 31 on each of the opposite sides.

[0069] Figure 3 shows a top view of a schematic acoustic unit 1 with an electrical conductor 7. As can be seen here, the electrical conductor 7 is arranged in a meandering pattern. The electrical conductor 7 winds its way through the conductor layers 5, 6.

[0070] Furthermore, the two conductor layers 5, 6 are shown here. The electrical conductor 7, which is shown hatched here, is arranged in the first conductor layer 5. The electrical conductor 7, which is not hatched here and is shown on the left side of the figure, is arranged in the second conductor layer 6. The second conductor layer 6 is arranged, for example, below the first conductor layer 5 in this viewing direction.

[0071] As an example, two conductor sections 8a, 8b are also provided with a reference symbol. The first conductor section 8a is located in the first conductor layer 5, and the second conductor section 8b is located in the second conductor layer 6.

[0072] Furthermore, the contact section 29 (bottom left in the Figure 3 ). Through this contacting section 29, the electrical conductor 7 is guided, so to speak, from the first conductor layer 5 into the second conductor layer 6.

[0073] Furthermore, a covering section 9 is shown here. As can be seen, the acoustic unit 1 comprises several covering sections 9, whereby for the sake of clarity, only one covering section 9 is provided with a reference symbol.

[0074] In addition, the electrical currents 13 are represented by arrows. The solid arrow represents the electrical current 13 in the first conductor layer 5 or in the first conductor section 8a shown here, and the dashed arrow represents the electrical current 13 in the second conductor layer 5 or in the second conductor section 8b. Thus, the electrical current 13 flows in one direction or in the longitudinal direction 12 in the covering section 9 according to the solid arrow. After the contacting section 29, the electrical current 13 flows in the opposite direction or longitudinal direction 12 according to the dashed arrow. Thus, the electrical current 13 flows in the two conductor sections 8a, 8b shown here in opposite directions to one another.

[0075] After the electrical current 13 has flowed through the second conductor section 8b, a connecting section 32 is arranged. The electrical conductor 7 comprises the connecting section 32. The connecting section 32 connects two conductor sections 8 arranged next to one another, in particular in the transverse direction 10. Thus, the connecting section 32 shown here connects the second conductor section 8b shown here with the conductor section 8 (not shown here), which is arranged below the first conductor section 8a in this viewing direction. As a result, the electrical current 13, after it has flowed through the second conductor section 8b and the connecting section 32, can flow parallel to the electrical current 13 in the first conductor section 8a.

[0076] In the present exemplary embodiment, the conductor sections 8 are rectilinear and / or parallel to one another. Additionally or alternatively, two conductor sections 8 adjacent to one another, in particular in the transverse direction 10, are antiparallel to one another. This means that in two conductor sections 8 adjacent to one another, in particular in the transverse direction 10, the respective electrical currents 13 are oriented antiparallel or opposite to one another.

[0077] Additionally or alternatively, the connecting sections 32 are curved. In particular, the connecting sections 32 are curved in such a way that they reverse the direction of the electrical current 13. The connecting sections 32 thus have a 180° curvature. The connecting sections 32 can form a semicircle.

[0078] In addition, a conductor section spacing 36 is shown here. The conductor section spacing 36 is the distance between two conductor sections 8 of a conductor layer 5, 6. The conductor section spacing 36 is also the distance between two adjacent covering sections 9. The conductor section spacing 36 can advantageously correspond to a magnetic element width 38, in particular 50% to 200% of the magnetic element width 38. Furthermore, the conductor sections 8 are concentrated in the area between two magnetic elements 16 - 21 following one another in the transverse direction 10 or in the area of ​​the free space 26. The coil arrangement 4 is designed in this way. The magnetic element width 38 is the width of the magnetic elements 16 - 21 in the transverse direction 10. The magnetic element width 38 is in Figure 1 to see.

[0079] In the Figure 3 a second mirror plane 44 is also shown. The first mirror plane 41 is in the Figure 4shown. The second mirror plane 44 extends in the transverse direction 10 and in the normal direction 11. The electrical conductor 7 and / or the conductor sections 8 and / or the covering sections 9 are mirrored at the second mirror plane 44. As can be seen here, the connecting sections 32 are mirrored at the second mirror plane 44 in such a way that they change the conductor layer 5, 6 upon reflection.

[0080] Figure 4 shows a perspective view of an electrical conductor 7 in two conductor layers 5, 6 and with several conductor sections 8.

[0081] Here again, several conductor sections 8 are shown, whereby for the sake of clarity only one conductor section 8 is provided with a reference symbol.

[0082] Furthermore, several conductor section groups 33a-33f are shown here. The conductor section groups 33a-33f each comprise several conductor sections 8, which are grouped together. This means that a conductor group spacing 37 between two conductor section groups 33a-33f is greater than or equal to a spacing or conductor section spacing 36 between two conductor sections 8 of a conductor section group 33a-33f. The conductor section spacing 36 between two adjacent conductor sections 8 is not shown here for the sake of clarity. Furthermore, according to the present exemplary embodiment, a conductor section group 33a-33f comprises four conductor sections 8.

[0083] The conductor group spacing 37 is dimensioned such that a magnetic element 16 - 21 can be arranged between two adjacent conductor section groups 33a - 33f.

[0084] Furthermore, it is advantageous if the electrical current 13 flowing in the conductor sections 8 of a conductor section group 33a-33f is parallel and / or rectified to one another. This is shown by the fact that the arrows of the electrical currents 13 of the conductor sections 8 of a conductor section group 33a-33f are parallel and / or rectified.

[0085] Furthermore, it is advantageous if the electrical currents 13 in the conductor sections 8 of adjacent conductor section groups 33a-33f are oriented opposite to one another. For example, the electrical currents 13 of the first conductor section group 33a flow out of the plane in this perspective. The electrical currents 13 of the adjacent second conductor section group 33b are oriented oppositely. This means that these electrical currents 13 flow into the plane. The electrical currents 13 of the conductor sections 8 of the adjacent third conductor section group 33c are again oriented oppositely.

[0086] Furthermore, some conductor section groups 33a-33f are arranged in the first conductor layer 5 and some conductor section groups 33a-33f are arranged in the second conductor layer 6. Four conductor section groups 33a-33d are arranged in the second conductor layer 6, and two conductor section groups 33e-33f are arranged in the first conductor layer 5.

[0087] Since the first four conductor section groups 33a-33d are arranged in the second conductor layer 6, and the fifth and sixth conductor section groups 33e-33f are arranged in the first conductor layer 5, they are connected to one another by means of the connecting sections 32. For the sake of clarity, only one connecting section 32 is provided with a reference symbol. The conductor sections 8 are connected to one another by means of the connecting sections 32 in such a way that a conductor section 8 of one conductor section group 33a-33f is followed by a conductor section 8 of another conductor section group 33a-33f. The connecting sections 32 are represented here by solid lines.

[0088] In addition, this exemplary embodiment shows contacting sections 29 that connect the conductor sections 8 of the various conductor layers 5, 6 to one another. The contacting sections 29 are each arranged between a conductor section 8 of the first conductor layer 5 and a conductor section 8 of the second conductor layer 6.

[0089] In addition, the electrical conductor 7 has an input 34 and an output 35, so that the electrical current 13 is conducted from the input 34 to the output 35. Furthermore, there is only a single input 34 and a single output 35. This means that a single electrical conductor 7 leads through the coil arrangement 4.

[0090] Furthermore, the conductor section groups 33a - 33f have conductor group widths of 40. For the sake of simplicity, only one conductor section group 33b is marked with the conductor group width of 40.

[0091] To Figure 1It is explained that the conductor section width 39 can be greater than or equal to the distance between two magnetic elements 16-21 following one another in the transverse direction 10, whereby these two magnetic elements 16-21 following one another in the transverse direction 10 are or can be arranged in different magnetic units 14-15. The same can also apply to the conductor section groups 33a-33f. The conductor group width 40 can be greater than or equal to the distance between two magnetic elements 16-21 following one another in the transverse direction 10, whereby these two magnetic elements 16-21 following one another in the transverse direction 10 are or can be arranged in different magnetic units 14-15. In this case, the conductor section width 39 of the conductor section 8 of the conductor section group 33a-33f is correspondingly small, since several conductor sections 8 form the conductor section group 33a-33f.

[0092] In the Figure 4A first mirror plane 41 is also shown. The second mirror plane 44 is in Figure 3shown. The coil arrangement 4, the at least one electrical conductor 7, the conductor sections 8 and / or the conductor section groups 33a-33f have a symmetry, in particular a mirror symmetry, wherein the coil arrangement 4, the at least one electrical conductor 7, the conductor sections 8 and / or the conductor section groups 33a-33f are mirrored at the first mirror plane 41. As can also be seen here, however, the electrical currents 13 are mirrored in such a way that they reverse their orientation upon mirroring. This symmetry can apply in particular to the arrangement of the conductor sections 8, the conductor section groups 33a-33f, the connecting sections 32 and / or the contacting sections 29. If, for example, a connecting section 32 has a kink and its mirrored partner does not have a kink, this does not necessarily have to destroy the symmetry described here.Rather, the symmetry can mean that the at least one electrical conductor 7, the conductor sections 8, and / or the conductor section groups 33a-33f are arranged substantially symmetrically. A connecting section 32 and / or a contacting section 29 and the corresponding mirrored partners connect two conductor sections 8 and the corresponding mirrored partners. The first mirror plane 41 extends here in the normal direction 11 and in the longitudinal direction 12.

[0093] The acoustic unit 1, in particular the electrical conductor 7, the conductor sections 8, the overlapping sections 9, the conductor section groups 33a-33f, the connecting sections 32, and / or the contacting sections 29, can have a symmetry according to the first mirror plane 41 and / or the second mirror plane 44. The electrical conductor 7, the conductor sections 8, the overlapping sections 9, the conductor section groups 33a-33f, the connecting sections 32, and / or the contacting sections 29 can be arranged in a mirrored manner such that they change the conductor layer 5, 6 upon reflection at the first mirror plane 41 and / or at the second mirror plane 44.

[0094] The symmetry has the advantage of creating technical advantages, such as balanced force generation, balanced weight distribution, and thus idealized oscillation behavior. Furthermore, repeated conductor passages between the magnets can be avoided.

[0095] In the Figure 4 the intermediate region 45 between two conductor section groups 33 adjacent in the transverse direction 10 is also shown.

[0096] The Figures 5a and 5b show top views of an acoustic unit 1, with a circular electrical conductor 7. The Figure 5a shows the first conductor layer 5 and the electrical conductor 7 arranged therein with the curved conductor sections 8. The Figure 5bshows the second conductor layer 6 and the electrical conductor 7 arranged therein with the curved conductor sections 8a - 8f. Both conductor layers 5, 6 are arranged one above the other. Furthermore, the contacting section 29 is in both Figure 5a, 5b which connects the conductor sections 8a - 8f of the two conductor layers 5, 6.

[0097] Furthermore, in this example the Figure 5a, 5b three magnetic elements 16, 17, 20 are shown. The radially innermost magnetic element 16 and the radially outermost magnetic element 17 shown here are, for example, part of the first magnetic unit 14 (cf. Figure 1 ). The magnetic element 20 arranged between these two magnetic elements 16, 17 is part of the second magnetic unit 15 (cf. Figure 1 ). In comparison with the two magnet units 14, 15 of the Figure 1The magnetic elements 16, 17, 20 shown here are not straight, but also curved or circular. The outermost magnetic element 17 shown here is radially outside the first conductor section group 33a of the Figure 5a and the third conductor section group 33c of the Figure 5b The innermost magnetic element 16 shown here is arranged radially within the conductor section group 33b of the Figure 5a and the fourth conductor section group 33d of the Figure 5b The magnetic element 20 shown here, which is in the radial direction, is arranged in the Figure 5a between the first and second conductor section groups 33a, 33b and in Figure 5b between the third and fourth conductor section groups 33c, 33d.

[0098] In addition, the Figure 5a six conductor sections 8a - 8f are shown. The conductor sections 8a - 8f are spaced apart from each other in the radial direction. In the Figure 5bThe six conductor sections 8g - 8l are shown. The respective conductor sections 8a - 8f of the Figure 5a with the conductor sections 8g - 8l of the Figure 5b , so that the overlapping sections 9 are formed, which are not shown here, however.

[0099] The electric current 13 is in the Figures 5a and 5b oriented in such a way that it is in the Figure 5a in radial direction from outside to inside and in the Figure 5b flows from the inside to the outside.

[0100] Furthermore, the Figure 5aThe three outer conductor sections 8a-8c are combined to form the first conductor section group 33a. The three inner conductor sections 8d-8f are combined to form the second conductor section group 33b. The magnetic element 20 is arranged between the first conductor section group 33a and the second conductor section group 33b in the sound transducer unit 2. The two conductor section groups 33a, 33b are connected here to the connecting section 32. As can also be seen here, the electrical currents 13 in the respective conductor sections 8a-8f of the respective conductor section groups 33a, 33b flow parallel to one another. In contrast, the electrical currents 13 of the conductor sections 8a-8f of the two adjacent conductor section groups 33a, 33b flow opposite to one another.

[0101] Same as for the Figure 5a also applies to the Figure 5bThe three outer conductor sections 8g - 8i are combined to form the third conductor section group 33c. In this conductor section group 33c, the electrical currents 13 in the conductor sections 8g - 8i flow parallel to one another. The three inner conductor sections 8j - 8l are combined to form the fourth conductor section group 33d. In this group, the electrical currents 13 in the conductor sections 8j - 8l also flow parallel to one another.

[0102] The electrical currents 13 of the conductor sections 8g - 8l of the adjacent conductor section group 33c, 33d, however, flow opposite to each other.

[0103] The electrical conductor 7, the conductor sections 8 and / or the conductor section groups 33a - 33d have in the Figures 5a and 5balso has a symmetry, in particular a point symmetry. For this purpose, a symmetry center 42 is shown, which is arranged in the middle of the conductor layers 5, 6. The symmetry is to be understood as fundamental here, for example, the slight kinks on the right side in Figure 5a and the creases in the lower area in the Figure 5b the symmetry. In addition, the connecting sections 32 of the respective figures also have no symmetry partner. However, it should be understood that at least the conductor sections 8 are arranged symmetrically, i.e., each conductor section 8 has a symmetry partner with respect to the center of symmetry 42. The advantages of symmetry are Figure 4 called.

[0104] The two Figures 6a and 6b show two sectional views of the Figure 3 according to sections AA and BB. Figure 6a shows the section AA and the Figure 6b shows the section BB.

[0105] As can be seen, a mirror line 46 is drawn. Along the mirror line 46, the connecting sections 32, as shown in the Figure 6a combined with Figure 3can be seen, has a mirror symmetry. The mirroring is shown by the arrow. The connecting section 32 of the first conductor layer 5 (top left) is mirrored onto the connecting section 32 of the second conductor layer 6 (bottom right) and vice versa. The electrical conductor 7 is arranged, designed and / or laid in such a way that when the connecting sections 32 are mirrored on the mirror line 46, the current directions of the electrical current 13 flowing in the connecting sections 32 are reversed. This leads to an advantageous laying or arrangement of the electrical conductor 7. The mirror symmetry of the connecting sections 32 on the mirror line 46 ensures that the electrical currents 13 in the conductor sections 8 with the overlap sections 9 are parallel to one another.Furthermore, the mirror symmetry of the connecting sections 32 on the mirror line 46 prevents long paths of the electrical conductor 7 outside the conductor sections 8 in the overlap sections 9. This leads to mechanical balance and the shortest possible conductor length of the electrical conductor 7 outside the relevant permanent magnetic field 23.

[0106] The mirror symmetry of the connecting sections 32 on the mirror line 46 can be a geometric reflection or mirror symmetry and / or a functional reflection or mirror symmetry. In the geometric reflection, the shapes of the connecting sections 32 are retained. Additionally or alternatively, the sizes and / or dimensions of the connecting sections 32 can also be retained. The geometric reflection is in the Figure 3in which the shape and / or size of the connecting sections 32 are retained. Both connecting sections 32 are curved or circular, i.e., they have the same shape.

[0107] Additionally or alternatively, the connecting sections 32 can also have functional mirroring or mirror symmetry. With functional mirroring, the function and purpose of the connecting sections 32 are retained. The shape and / or size can change. For example, the connecting sections 32 of the Figure 3 that have functional mirror symmetry to each other, have different shapes and / or sizes. For example, as shown in the Figure 3As shown, a connecting section 32 may be curved or circular, and the corresponding, mirrored connecting section 32 may be square. The shape and / or size of the connecting sections 32 are not important for the function and / or purpose, since they connect the conductor sections 8 in the covering sections 9.

[0108] However, it may be advantageous if the connecting sections 32 exhibit, in particular substantially or approximately, geometric mirror symmetry. This results in a uniform and / or mirrored weight distribution of the electrical conductor 7, which leads to improved deflection properties. Thus, deviations from the geometric mirroring or mirror symmetry are permitted as long as they do not negatively affect the vibration properties of the acoustic unit 1 due to the asymmetrical weight distribution, or as long as the changed vibration properties are tolerable.

[0109] Furthermore, the connecting sections 32 cross and / or bridge the intermediate regions 45. The magnetic elements 16-21 are also arranged in the intermediate regions 45, as shown in the Figure 1 can be seen. Only one or more magnetic elements 16-21 are arranged in the intermediate regions 45. Consequently, the connecting sections 32 cross the magnetic elements 16-21 when the acoustic unit 1 is arranged in the sound transducer unit 2 in the intended arrangement.

[0110] Alternatively, the connecting sections 32 can extend beyond the magnetic elements 16-21 in the longitudinal direction 12. There, the permanent magnetic field 23 weakens, so that the electric current 13 in the connecting sections 32 interacts only slightly with the permanent magnetic field 23.

[0111] In this embodiment and better in the Figure 3It is further shown that in each conductor layer 5, 6, in particular only one connecting section 32 crosses and / or bridges the intermediate region 45.

[0112] Figure 7 shows the arrangement of the coil arrangement 4 of the Figure 4. Here, all irrelevant reference numerals have been omitted to better illustrate the mirror symmetry. The mirror line 46 is shown again here. In addition, the mirroring is shown by means of the arrow on two connecting sections 32 as an example. The connecting section 32 in the first conductor layer 5 is mirrored onto the connecting section 32 in the second conductor layer 6, with the current direction being reversed during the mirroring. It should be noted here that the connecting sections 32 of the upper first conductor layer 5 are only shown schematically as if they are bent downwards in the direction of the second conductor layer 6. In reality, they are arranged such that they run in a plane with the first conductor layer 5. The same applies to the connecting sections 32 of the second conductor layer 6, which are also shown here as if they run downwards.

[0113] Furthermore, the mirror symmetry of the connecting sections 32 on the mirror line 46 only applies to the connecting sections 32 that also have a mirror partner. Figure 4 and 7 For example, the connecting sections 32 of the two outer pairs of conductor section groups 33a, 33b and 33c, 33d do not have a mirror partner in the first conductor layer 5. However, the coil arrangements 4 can have several conductor sections 8 shown than in the Figure 4 and 7 As a result, at least most of the connecting sections 32 may have a mirror partner.

[0114] Furthermore, the intermediate regions 45 between the conductor section groups 33 are shown here, with only one intermediate region 45 being provided with a reference symbol. As can also be seen here, several connecting sections 32 cross and / or bridge an intermediate region 45. Furthermore, the connecting sections 32 are arranged parallel to one another when these several connecting sections 32 cross and / or bridge an intermediate region 45. This prevents the connecting sections 32 from crossing each other when they cross and / or bridge the intermediate region 45.

[0115] What in the Figure 4 and 7What can still be seen is the conductor routing of the electrical conductor 7. According to this exemplary embodiment, the electrical conductor 7 is arranged such that the electrical current 13 flows through a conductor section 8 of a conductor section group 33 and then through a conductor section 8 of another conductor section group 33. Thus, the electrical current 13 only flows through one conductor section 8 per conductor section group 33 until all conductor section groups 33 have been passed through. Then the next conductor section 8 of the first conductor section group 33a is passed through until all conductor section groups 33 have been passed through again. This leads to an advantageous and space-saving arrangement of the electrical conductor 7. Reference sign list

[0116] 1Acoustic unit 2Sound transducer unit 3Membrane 4Coil arrangement 5First conductor layer 6Second conductor layer 7Electrical conductor 8Conductor section 9Overlap section 10Transverse direction 11Normal direction 12Longitudinal direction 13Electrical current 14First magnet unit 15Second magnet unit 16First magnet element 17Second magnet element 18Third magnet element 19Fourth magnet element 20Fifth magnet element 21Sixth magnet element 22Magnetization direction 23Permanent magnetic field 24Conductor section spacing 25Stroke axis 26Free space 27Membrane material 28Insulating layer 29Contacting section 30First protective layer 31Second protective layer 32Connecting section 33Conductor section group 34Input 35Output 36Conductor section spacing 37Conductor group spacing 38Magnetic element width 39Conductor section width 40Conductor group width 41First mirror plane 42Center of symmetry 43Magnetic element spacing 44Second mirror plane 45Intermediate area 46Mirror line

Claims

1. Acoustic unit (1) for a sound transducer unit (2), in particular for a flat loudspeaker, preferably for a magnetostatic loudspeaker, for generating and / or detecting sound waves, comprising a membrane (3) and a coil arrangement (4) coupled to the membrane (3), which coil arrangement comprises at least one electrical conductor (7), wherein the at least one electrical conductor (7) comprises conductor sections (8) at least in a first and a second conductor layer (5, 6), and wherein the first and second conductor layers (5, 6) are arranged one above the other, characterized by , that at least some conductor sections (8) of different conductor layers (5, 6) have an overlap section (9) in which the conductor sections (8) of the different conductor layers (5, 6) overlap.

2. Acoustic unit according to the previous claim, characterized by , thatthe at least one electrical conductor (7) is arranged in the at least two conductor layers (5, 6) in such a way that in the respective conductor sections (8), which overlap in a common overlap section (9), the electrical currents (13) are oriented parallel and / or in the same direction to one another.

3. Acoustic unit according to one or more of the preceding claims, characterized by , that the conductor sections (8) are straight and / or curved, in particular circular, and / or that the electrical conductor (7) is arranged in a meandering shape.

4. Acoustic unit according to one or more of the preceding claims, characterized by , thata plurality of, in particular at least two, preferably at least four, particularly preferably less than 20 or less than 30, conductor sections (8) arranged in a conductor layer (5, 6) together form a conductor section group (33), wherein the conductor layers (5, 6) preferably have a plurality of conductor section groups (33), and in that the electrical conductor (7) is preferably arranged such that the electrical currents (13) flowing in the conductor sections (8) of a conductor section group (33) are oriented parallel to one another and / or in the same direction, and / or in that the electrical conductor (7) is preferably arranged such that the electrical currents (13) of the conductor sections (8) of two mutually, in particular directly adjacent, conductor section groups (33) are oriented antiparallel to one another and / or in opposite directions.

5. Acoustic unit according to one or more of the preceding claims, characterized by , thata conductor section spacing (36) and / or a conductor group spacing (37) between two adjacent conductor sections (8) and / or conductor section groups (33) is less than 1 mm and / or wherein the conductor section spacing (36) and / or the conductor group spacing (37) is equal to or smaller, in particular between 5% and 75% smaller, than a magnet element width (38) of a magnet element (16 - 21) of the sound transducer unit (2), and / or that a conductor section width (39) of the conductor sections (8) and / or a conductor group width (40) of the conductor section groups (33) in the transverse direction (10) is equal to or larger, in particular 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50% larger, than an intended magnet element spacing (43) and / or a width of a free space (26) in the transverse direction (10) between two magnetic elements (16 - 21) directly following one another in the transverse direction (10).

6. Acoustic unit according to one or more of the preceding claims, characterized by , thatthe at least one electrical conductor (7) is arranged such that the electrical current (13) flowing therein can be guided, in particular several times, alternately in the first and in the second conductor layer (5, 6).

7. Acoustic unit according to one or more of the preceding claims, characterized by , that a plurality of conductor sections (8) and / or conductor section groups (33) are arranged next to one another in the at least first and / or second conductor layer (5, 6), in particular in the transverse direction (10), and in that the electrical conductor (7) is arranged such that in these conductor sections (8) and / or conductor section groups (33) arranged next to one another, a current direction (13) is oriented alternately opposite to one another.

8. Acoustic unit according to one or more of the preceding claims, characterized by , thatthe at least one electrical conductor (7) comprises one or more connecting sections (32) which electrically connect the conductor sections (8) of a conductor layer (5, 6) to one another, and / or that the at least one electrical conductor (7) comprises contacting sections (29) which electrically connect the conductor sections (8) of different conductor layers (5, 6) to one another.

9. Acoustic unit according to one or more of the preceding claims, characterized by , that the at least one electrical conductor (7), the conductor sections (8), the conductor section groups (33), the connecting sections (32) and / or the contacting sections (29) have a symmetry, in particular a mirror symmetry and / or a point symmetry, preferably with respect to a mirror plane (41) and / or a center of symmetry (42).

10. Acoustic unit according to one or more of the preceding claims, characterized by , thatthe connecting sections (32) have a mirror symmetry on a mirror line (46), so that a connecting section (32) of one conductor layer (5, 6) is imaged onto a connecting section (32) of the other conductor layer (5, 6), wherein the current direction in the mutually mirrored connecting sections (32) is reversed during mirroring.

11. Acoustic unit according to one or more of the preceding claims, characterized by , that the connecting sections (32) cross intermediate regions (45) of conductor sections (8) and / or of conductor section groups (33) and / or that the connecting sections (32) cross magnetic elements (16 - 21) of a magnetic unit (14, 15) of the sound transducer unit (1) when the acoustic unit (1) is arranged in the sound transducer unit (2).

12. Acoustic unit according to one or more of the preceding claims, characterized by , thatthe electrical conductor (7) is printed using a 3D printing process and / or that the acoustic unit (1), in particular the coil arrangement (4), is formed by means of a lithography process.

13. Acoustic unit according to one or more of the preceding claims, characterized by , that the coil arrangement (4) is deformation-resistant and / or that the coil arrangement (4) and / or at least one, in particular both, conductor layers 5, 6 are formed from a silicon carrier material which preferably has a thickness of 50 µm, and / or that the coil arrangement (4) is connected to the membrane (3) and / or that the electrical conductor (7) is formed with the membrane (3), in particular printed into a membrane material (27), and / or that the coil arrangement (4), in particular the electrical conductor (7), is embedded in the membrane (3) and / or is surrounded by the membrane material (27).

14. Sound transducer unit (2), in particular flat loudspeaker, preferably magnetostatic loudspeaker, for generating and / or detecting sound waves with at least one magnet unit (14, 15) comprising a plurality of magnet elements (16 - 21), and with at least one acoustic unit (1), characterized by , that the acoustic unit (1) is designed according to one or more of the preceding claims.

15. Coil arrangement (4) for an acoustic unit (1) and / or for a sound transducer unit (2) according to one or more of the preceding claims.

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