Acoustic unit for sound conversion unit

Abstract

The invention relates to an acoustic unit (1) for a sound conversion unit (2), in particular for a flat speaker, preferably for a magnetostatic speaker, for generating and / or detecting sound waves, having a membrane (3) and a coil arrangement (4) coupled to the membrane (3), the coil arrangement comprising at least one electrical conductor (7), the at least one electrical conductor (7) comprises conductor sections (8) at least in the first and second conductor layers (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 of the conductor sections (8) of the different conductor layers (5, 6) have an overlap section (9) with one another, in which overlap section the conductor sections (8) of the different conductor layers (5, 6) overlap.

Description

Technical Field

[0001] The present invention relates to an acoustic unit for a sound conversion unit, in particular for a flat-panel speaker, preferably for a static magnetostatic speaker, the sound conversion unit being used to generate and / or detect sound waves, the acoustic unit having a membrane and a coil device coupled to the membrane, the coil device comprising 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, and wherein the first and second conductor layers are arranged one on top of the other. Background Art

[0002] JP 2000-345369A discloses an acoustic unit having a coil arrangement. Summary of the invention

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

[0004] This object is achieved by an acoustic unit, a sound converter unit, a coil arrangement and a use of a coil arrangement and an acoustic unit having the features of the independent claims.

[0005] An acoustic unit for a sound transducer unit, in particular for a flat panel loudspeaker, preferably for a magnetostatic loudspeaker, is proposed, the sound transducer unit being used to generate and / or detect sound waves.

[0006] The acoustic unit comprises a membrane. The membrane can be deflected to generate sound waves. Additionally or alternatively, the membrane can also be deflected by the sound waves so that the sound waves can be detected.

[0007] In addition, the acoustic unit comprises a coil arrangement coupled to the membrane, the coil arrangement comprising at least one electrical conductor, wherein at least one electrical conductor comprises a conductor segment at least in the first and second conductor layers. The electrical conductor can be loaded with an electrical signal, which forms a current in the electrical conductor. If the acoustic unit is arranged in the permanent magnetic field of the sound conversion unit, this causes the membrane to deflect due to the Lorentz force, thereby generating sound waves according to the electrical signal. On the contrary, if the membrane is deflected by the incoming sound wave, the electrical conductor moves in the permanent magnetic field, thereby inducing a voltage or an electrical signal. Thus, the sound wave can be detected.

[0008] Furthermore, the first and second conductor layers are arranged one above the other.

[0009] Furthermore, at least some conductor sections of different conductor layers have overlapping sections with one another, in which the conductor sections of different conductor layers overlap.

[0010] It is also advantageous if at least one electrical conductor is arranged in at least two conductor layers so that in corresponding conductor sections overlapping in a common overlapping section, the currents are oriented parallel to one another and / or in the same direction. This leads to higher Lorentz forces. As a result, the deflection can be increased when generating sound waves.

[0011] Advantages result if the conductor sections and / or conductor layers in the overlapping section are arranged one above the other in the normal direction of the coil arrangement and / or the acoustic unit.

[0012] It is advantageous if the conductor sections overlap in a transverse direction or in a longitudinal direction of the coil arrangement. Additionally or alternatively, it is useful if the overlapping sections extend in a transverse direction and / or in a longitudinal direction of the coil arrangement.

[0013] It is necessary for the conductor section to be of straight and / or curved, in particular circular, design.

[0014] It is necessary that a plurality of, in particular at least two, preferably at least four, particularly preferably less than 20 or less than 30, conductor segments arranged in the conductor layer together form a conductor segment group, wherein the conductor layer preferably has a plurality of conductor segment groups. As a result, the current can flow in the conductor layer in a two-dimensional manner. As a result, the membrane can be deflected in a two-dimensional manner. Thus, a conductor segment group can have two to 20 or 30 conductor segments arranged side by side and preferably parallel to each other.

[0015] Advantageously, the conductor segment distance and / or conductor group distance between two mutually adjacent conductor segments and / or conductor segment groups is less than 1 mm. Additionally or alternatively, it is advantageous that the conductor segment distance and / or conductor group distance is equal to or less than the magnetic element width of the magnetic element of the sound conversion unit, in particular less than 5% to 75%. Additionally or alternatively, the conductor segment distance and / or conductor group distance may also correspond to 25% to 75% or 90% of the magnetic element width. In the arrangement of the acoustic unit in the sound conversion unit or between two superimposed magnetic units, the area between two adjacent conductor segments and / or conductor segment groups may be arranged below or above the magnetic element. In the area below or above the magnetic element, the magnetic field formed is weakest or even disappears, so that in these areas, the conductor segments and / or conductor segment groups are less effective.

[0016] Advantageously, the conductor segment width of the conductor segment and / or the conductor segment group width in the transverse direction of the conductor segment is equal to or greater than the distance between the provided magnetic elements and / or the width of the free space in the transverse direction between two magnetic elements directly following each other in the transverse direction, in particular greater than 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%. Thus, the conductor segment and / or the conductor segment group at least partially extends into the region of the magnetic element in the transverse direction. Thus, the conductor segment and / or the conductor segment group with the magnetic element has a conductor-magnetic element overlapping section. This can increase the effectiveness of the deflection.

[0017] It is necessary that at least one electrical conductor is arranged in such a way that the conductor sections are arranged in series with one another, so that the current is conducted successively through the conductor sections.

[0018] It is advantageous if at least one electrical conductor is arranged in such a way that an electric current flowing therein can be conducted alternately, in particular multiple times, in the first and second conductor layers.

[0019] Advantages result if a plurality of conductor segments and / or conductor segment groups are arranged side by side in at least the first and / or second conductor layer, in particular in a transverse direction, and the electrical conductors are arranged in such a way that the current directions in the conductor segments and / or conductor segment groups arranged side by side are oriented alternately opposite to one another. This makes it possible for the Lorentz forces acting on the conductor segments and / or conductor segment groups to be directed in the same direction as one another.

[0020] Advantageously, the electrical conductor is arranged in a meander shape so that current can be conducted through the electrical conductor alternately in opposite directions.

[0021] An improvement results if two and ten or twenty, in particular four, overlapping segments are arranged next to each other in the transverse direction of the coil arrangement.

[0022] It is useful if the electrical conductors are arranged in such a way that the currents flowing in the conductor segments of a conductor segment group are oriented parallel to one another and / or in the same direction.

[0023] An improvement occurs if the electrical conductors are arranged in such a way that the currents of the conductor segments of two mutually adjacent, in particular directly adjacent, conductor segment groups are oriented antiparallel and / or opposite to one another. The Lorentz magnetic forces are therefore oriented identically to one another.

[0024] It is useful if at least one of the electrical conductors comprises a connecting section which electrically connects the conductor sections of the conductor layers to one another.

[0025] Advantageously, at least one electrical conductor comprises a contact section which electrically connects conductor sections of different conductor layers to one another.

[0026] Advantageously, the connecting section has a mirror symmetry at the mirror line, so that the connecting section of the conductor layer is mapped onto the connecting section of the other conductor layer. Therefore, the connecting section is arranged, formed and / or laid in such a way that they have a mirror symmetry at the mirror line. In this mirror symmetry at the mirror line, the current direction is reversed in the mutually mirrored connecting sections during mapping. Thus, an advantageous and space-saving arrangement of the electrical conductor is achieved. In addition, it is thus achieved in a simple manner that the currents in the conductor sections that have overlapping sections together are parallel to each other and / or oriented in the same direction and / or in the same direction. Of course, this mirror symmetry only applies to connecting sections with mirror counterparts.

[0027] It is also advantageous if the connecting section intersects with the middle region of the conductor segment and / or the conductor segment group. The middle region is respectively arranged between two mutually adjacent conductor segments. Additionally or alternatively, the middle region can also be arranged between two mutually adjacent conductor segment groups. Additionally or alternatively, it is advantageous if the connecting section intersects with the magnetic element of the magnetic unit of the sound conversion unit in the provided arrangement of the acoustic unit in the sound conversion unit. This reduces the interfering influence of the current in the region outside the conductor segment.

[0028] It is also advantageous if the connecting section is arranged in a region outside the magnetic element in the longitudinal direction of the magnetic element. In the region outside or beside the magnetic element, the permanent magnetic field of the magnetic element is weakened, so that the current in the connecting section interacts only weakly with the permanent magnetic field. The connecting section thus protrudes beyond the corresponding end of the magnetic element.

[0029] An improvement occurs if the electrical conductor is printed using a 3D printing method. As a result, the acoustic unit can be formed in a simple manner.

[0030] It is also advantageous if the acoustic unit, in particular the coil arrangement, is produced by means of a photolithographic method in semiconductor technology. As a result, the coil arrangement can be produced with a very small structure and very low tolerances. The coil arrangement can also be arranged on and / or connected to a particularly flexible membrane. For example, the coil arrangement can be glued to the membrane.

[0031] Advantageously, the coil arrangement is deformation-resistant. As a result, the coil arrangement deflects as a unit and does not deform in the process, so that the current is conducted and maintained appropriately and with small tolerances between the magnetic elements. Deformations of the coil arrangement can lead to current being conducted where it should not be conducted and / or acoustically unfavorable forms of movement of the membrane and / or the acoustic unit.

[0032] It is also advantageous if the coil arrangement and / or at least one of the two conductor layers, in particular both conductor layers, are formed from a silicon carrier material. The electrical conductor can then be introduced into the conductor layer. Thus, the production method is combined with deformation resistance by means of semiconductor technology. For example, the coil arrangement can have a thickness of 50 μm.

[0033] Advantageously, the membrane is flexible. Thus, the membrane can deflect and the coil arrangement remains rigid and / or resistant to deformation.

[0034] According to an advantageous development of the invention, it is useful if the coil arrangement is connected to the film and / or the electrical conductor is formed with the film, in particular is printed into the film material.

[0035] Advantageously, the coil arrangement, in particular the electrical conductor, is embedded in the film and / or is surrounded by the film material. Thus, a fixed connection between the coil arrangement or the electrical conductor and the film can be formed.

[0036] It is necessary to arrange an insulating layer between the conductor layers so that the current can be conducted through the conductor sections in a defined manner.

[0037] Advantageously, the acoustic unit has a first and / or second protective layer. Thus, the electrical conductor can be protected against oxidation, for example.

[0038] Furthermore, a sound transducer unit, in particular a flat panel loudspeaker, preferably a magnetostatic loudspeaker, is proposed for generating and / or detecting sound waves.

[0039] The sound conversion unit comprises at least one magnetic unit, which comprises a plurality of magnetic elements. A permanent magnetic field can be formed by means of the at least one magnetic unit. Preferably, the sound conversion unit comprises at least two magnetic units, wherein each magnetic unit preferably comprises a plurality of magnetic elements.

[0040] The sound conversion unit comprises at least one acoustic unit, wherein the acoustic unit is formed according to one or more features of the aforementioned and / or subsequent description. Advantageously, the acoustic unit is arranged in the permanent magnetic field of at least one magnetic unit. The acoustic unit comprises at least one electrical conductor that can be loaded with an electric current. If an electric current flows through the electrical conductor, a Lorentz force is formed in the permanent magnetic field, thereby deflecting the membrane and generating sound waves. Conversely, if the membrane deflects together with the electrical conductor, a voltage is induced. The sound waves can thereby be detected.

[0041] Furthermore, a coil arrangement for an acoustic unit and / or a sound conversion unit is proposed, which has at least one of the features described above and / or below.

[0042] The invention also proposes the use of a coil arrangement, which in particular has at least one of the features of the preceding and / or subsequent description and features related to the coil arrangement. The coil arrangement is used for an acoustic unit according to one or more of the features of the preceding and / or subsequent description.

[0043] The acoustic unit is designed according to the above description, wherein the mentioned features may be present individually or in any desired combination.

[0044] Also proposed is the use of an acoustic unit for a coil arrangement and / or a sound conversion unit constructed according to one or more of the features mentioned in the preceding and / or subsequent description, which has at least one feature of the preceding and / or subsequent description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Further advantages of the present invention are described in the following embodiments. [ Figure 1 ] shows a cross-sectional view through the side of a schematic sound transducing unit having two magnetic units and an acoustic unit, [ Figure 2 ] shows a cross-section through the side of a schematic acoustic unit having two conductor layers and an electrical conductor, [ Figure 3 ] shows a top view of a schematic acoustic unit with an electrical conductor, [ Figure 4 ] shows a perspective view of an electrical conductor in two conductor layers and having a plurality of conductor sections, [ Figure 5a ] shows a top view of a circular electrical conductor in a first conductor layer, [ Figure 5b ] shows a top view of a circular electrical conductor in the second conductor layer, [ Figure 6a ] shows along Figure 3 The cross-sectional view of the cutting plane AA, [ Figure 6b ] shows along Figure 3 The cross-sectional view of the cutting plane BB, [ Figure 7 ] shows the most important reference numerals and with mirror lines Figure 4 . DETAILED DESCRIPTION

[0046] Figure 1A cross-section through the side of a schematic sound conversion unit 2 with two magnetic units 14, 15 and an acoustic unit 1 is shown. The acoustic unit 1 also includes a membrane 3 and a coil arrangement 4. With the aid of the sound conversion unit 2, sound waves can be generated and / or detected. The sound conversion unit 2 can be, for example, a flat panel loudspeaker or preferably a static magneto-loudspeaker. With the aid of the acoustic unit 1 or the sound conversion unit 2, sound waves can be generated and / or detected.

[0047] The two magnetic units 14, 15 shown here can form a permanent magnetic field 23 which acts on the acoustic unit 1 and in which the acoustic unit 1 is arranged. According to the present exemplary embodiment, the acoustic unit 1 is also arranged between the two magnetic units 14, 15.

[0048] According to the present embodiment, the magnetic units 14, 15 further include a plurality of magnetic elements 16-21, respectively. These magnetic elements 16-21 have a magnetization direction 22, respectively, thereby forming a permanent magnetic field 23. For the sake of clarity, only one magnetization direction 22 is provided with a reference numeral. Since the first magnetic unit 14 is arranged above the acoustic unit 1 and the second magnetic unit 15 is arranged below the acoustic unit 1, three magnetic elements 16-18 are also arranged above the acoustic unit 1, and three magnetic elements 19-21 are also arranged below the acoustic unit 1. The acoustic unit 1 is located between the magnetic elements 16-21.

[0049] As can also be seen here, the two magnetic units 14, 15 are offset with respect to one another, so that the magnetic elements 16-21 of one magnetic unit 14, 15 are arranged between the magnetic elements 16-21 of the other magnetic unit 14, 15. As can also be seen here, a free space 26 can be arranged between the magnetic elements 16-21 of a magnetic unit 14, 15 and the magnetic elements 16-21 of the other magnetic unit 14, 15 that are adjacent in the transverse direction 10. For the sake of clarity, only one free space 26 is provided with a reference numeral.

[0050] The coil arrangement 4 also includes at least one electrical conductor 7, which can be loaded with an electrical signal. As a result, a current 13 is formed in the electrical conductor 7. The current 13 is also shown here. The Lorentz force is formed by the current 13 in the permanent magnetic field 23, so that the acoustic unit 1 and therefore the membrane 3 are deflected along the lifting axis 25. As a result, sound can be generated, so that the sound conversion unit 2 operates as a loudspeaker. On the other hand, if the membrane 3 is deflected along the lifting axis 25 due to the incoming sound, a voltage is induced in the electrical conductor 7, which can be measured. As a result, sound waves can be detected, so that the sound conversion unit 2 operates as a microphone.

[0051] In addition, the electrical conductor 7 includes at least one conductor segment 8. The electrical conductor 7 of the present embodiment includes a plurality of conductor segments 8, wherein only one conductor segment 8 is provided with a reference numeral. The conductor segment 8 is preferably arranged in the region of the free space 26 in the sound conversion unit 2. In the region of the free space 26, the permanent magnetic field 23 is most advantageously configured for the deflection of the membrane 3. In the transverse direction 10 of the acoustic unit 1 or the sound conversion unit 2, the conductor segment 8 is preferably arranged next to the magnetic elements 16-21 and / or between the magnetic elements 16-11. In the conductor segment 8, the current 13 can flow in the permanent magnetic field 23 and preferably flows perpendicularly to the permanent magnetic field 23.

[0052] Furthermore, a normal direction 11 is shown here, which is oriented parallel to the lifting axis 25. Furthermore, a longitudinal direction 12 is also shown. The conductor section 8 is advantageously oriented in the longitudinal direction 12. Furthermore, the already described transverse direction 10 is also shown here.

[0053] Figure 1 Also shown is a magnetic element distance 43 between two magnetic elements 16-21 that are consecutive in the transverse direction 10. As can be seen, the magnetic element distance 43 is defined between two magnetic elements 16-21 that are consecutive in the transverse direction 10, which magnetic elements are arranged in different magnetic units 14,15.

[0054] In addition, the conductor segment 8 has a conductor segment width 39. For simplicity, only one conductor segment 8 is marked with a conductor segment width 39. According to the present embodiment, the conductor segment width 39 is such that it is adjacent to adjacent magnetic elements 16, 19 on the side or in the lateral direction 10. According to the present embodiment, the conductor segment width 39 is as large as the magnetic element distance 43 between two magnetic elements 16-21 that are directly adjacent in the lateral direction 10. The two magnetic elements 16-21 that are directly adjacent in the lateral direction 10 are also arranged in two different magnetic units 14, 15. Additionally or alternatively, the conductor segment width 39 can also be greater than the magnetic element distance 43 between two magnetic elements 16-21 that are directly adjacent in the lateral direction 10, for example, greater than 5% to 50%. Therefore, the conductor segment 8 extends into the region of the magnetic elements 16-21 in the lateral direction 10. Therefore, the conductor segment 8 and the magnetic elements 16-21 have a conductor-magnetic element overlap section. As a result, the effectiveness can be improved in terms of the deflection of the acoustic unit 1 or the membrane 3. Additionally or alternatively, the conductor section width 39 can be greater than the width of the free space 26 , for example by 5% to 50%.

[0055] In addition, as can be seen here, the acoustic unit 1 is arranged between two magnetic units 14, 15 arranged one above the other, so that the intermediate region 45 between the conductor segments 8 and / or the conductor segment group 33 explained later is arranged above and / or below the associated magnetic element 16-21 in the normal direction 11. In the region above or below the magnetic element 16-21, the magnetic field 23 is weak or disappears, so that the conductor segment 8 and / or the conductor segment group 33 have only 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 a plurality of intermediate regions 45. The intermediate region 45 extends in the transverse direction 10 and / or in the longitudinal direction 12. The intermediate region 45 can be constructed because the conductor segments 8 are arranged side by side and / or in parallel in the transverse direction 10. The intermediate region 45 is arranged between two adjacent conductor segments 8, respectively.

[0056] For the sake of simplicity, features that have already been described in at least one previous figure cannot be explained again. In addition, features can also only be described in this figure or in at least one subsequent figure. In addition, for the sake of simplicity, the same reference numerals are used for the same features. In addition, for the sake of clarity, not all features can be shown and / or provided with reference numerals in the subsequent figures. However, features shown in one or more previous figures can also be present in this figure or in one or more subsequent figures. In addition, for the sake of clarity, features can also only be shown and / or provided with reference numerals in this figure or in one or more subsequent figures. However, features that are only shown in one or more subsequent figures may also already be present in this figure or in a previous figure.

[0057] Figure 2 A cross-section through the side of a schematic acoustic unit 1 is shown having two conductor layers 5 , 6 , an electrical conductor 7 and a plurality of conductor segments 8 a - 8 j .

[0058] A plurality of conductor segments 8a-8j are shown here. The electrical conductor 7 comprises a plurality of conductor segments 8a-8j. The conductor segments 8a-8j extend in the longitudinal direction 12 and / or are spaced apart from one another in the transverse direction 10. An electric current 13 can flow in each conductor segment 8a-8j.

[0059] 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 segments 8a-8j are arranged in the at least two conductor layers 5, 6, respectively. In the present embodiment, the first, second, third, fourth and fifth conductor segments 8a-8e are arranged in the first conductor layer 5. The sixth, seventh, eighth, ninth and tenth conductor segments 8f-8j are arranged in the second conductor layer 6.

[0060] In addition, at least some conductor segments 8a-8j of different conductor layers 5, 6 have overlapping segments 9a-9e with each other, in which the conductor segments 8a-80j of different conductor layers 5, 6 overlap. In the overlapping segments 9a-9e, at least two conductor segments 8a-8j, that is, in particular, corresponding conductor segments 8a-80j of corresponding conductor layers 5, 6 overlap.

[0061] Therefore, in Figure 2 In the embodiment of the present invention, the first and sixth conductor sections 8a, 8f overlap and have a first overlapping section 9a with each other. Figure 2 In the embodiment of the present invention, the second and seventh conductor segments 8b, 8g overlap and have a second overlapping segment 9b with each other. The third and eighth conductor segments 8c, 8h overlap and have a third overlapping segment 9c with each other. The fourth and ninth conductor segments 8d, 8i overlap and have a fourth overlapping segment 9d with each other. The fifth and tenth conductor segments 8e, 8j overlap and have a fifth overlapping segment 9e with each other.

[0062] 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 each other in a normal direction 11 oriented parallel to the lifting axis 25. The overlapping sections 9a-9e also extend in a transverse direction 10 and a longitudinal direction 12 and are arranged in these two directions 10, 12 between the corresponding conductor sections 8a-8j arranged one above the other.

[0063] Furthermore, currents 13 are shown in the respective conductor sections 8a-8j. For the sake of clarity, not all currents 13 in the conductor sections 8a-8j are provided with reference numerals.

[0064] As can be seen further here, in the first and sixth conductor segments 8a, 8f having a common first overlap section 9a, the current 13 is oriented parallel to each other and flows out of the drawing plane in this view. In the second and seventh conductor segments 8b, 8g having a common second overlap section 9b, the current 13 is oriented parallel to each other and flows into the drawing plane in this view. In the third and eighth conductor segments 8c, 8h having a common third overlap section 9c, the current 13 is oriented parallel to each other and flows out of the drawing plane in this view. In the fourth and ninth conductor segments 8d, 8i having a common fourth overlap section 9d, the current 13 is oriented parallel to each other and flows into the drawing plane in this view. In the fifth and tenth conductor segments 8e, 8j having a common fifth overlap section 9e, the current 13 is oriented parallel to each other and flows out of the drawing plane in this view.

[0065] It is therefore advantageous that in the respective conductor segments 8a-8j having a common overlapping section 9a-9e, the currents 13 in the respective conductor segments 8a-80j are parallel to one another. It is also advantageous that in the respective conductor segments 8a-8j, whose overlapping sections 9a-9e are arranged in particular directly next to one another in the transverse direction 10, the currents 13 flowing therein are directed in opposite directions to one another. This means that the currents 13 in the conductor segments 8a-8j, whose overlapping sections 9a-9e are arranged in particular directly and preferably next to one another in the transverse direction 10, flow alternately in one direction and in the opposite direction. Thus, as Figure 2 It is shown that current 13 flows out of the drawing plane in conductor segments 8 a - 8 j in one overlapping segment 9 a - 9 e and flows into the drawing plane in conductor segments 8 a - 8 j of overlapping segments 9 a - 9 e that are consecutive in transverse direction 10 .

[0066] Furthermore, the membrane 3 of the acoustic unit 1 is shown here. The membrane 3 is also deflected by the Lorentz force acting on the electrical conductor 7 in the permanent magnetic field 23. The membrane 3 can have a membrane material 27. The electrical conductor 7 with the conductor segments 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 that the electrical conductor 7 is printed onto the membrane 3 or the membrane material 27 by means of a 3D printing method. In addition or alternatively to the electrical conductor 7, the membrane material 27 can also be printed by means of a 3D printing method.

[0067] The coil arrangement 4 further comprises at least one contact section 29 which electrically connects the conductor sections 8a-8j of different, in particular one-overlying, conductor layers 5, 6 to one another. Additionally or alternatively, the at least one contact section 29 can also be printed by means of a 3D printing method.

[0068] 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 only electrically connected to each other by means of at least one contact section 29.

[0069] Advantageously, as shown in the present embodiment, the acoustic unit 1 has at least one protective layer 30, 31. The electrical conductor 7 or the conductor segments 8a-8j can be protected by means of at least one protective layer 30, 31. Two protective layers 30, 31 are shown here, namely respective protective layers 30, 31 on mutually opposite sides.

[0070] Figure 3 A schematic plan view of an acoustic unit 1 is shown with an electrical conductor 7. As can be seen here, the electrical conductor 7 is arranged in a meandering manner. The electrical conductor 7 passes through the conductor layers 5, 6.

[0071] Furthermore, two conductor layers 5, 6 are shown here. The electrical conductor 7 shown here with hatching is arranged in the first conductor layer 5. The electrical conductor 7 not shown here with hatching and 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.

[0072] As an example, two conductor sections 8 a , 8 b are also provided here with reference numerals. The first conductor section 8 a is arranged in the first conductor layer 5 , and the second conductor section 8 b is arranged in the second conductor layer 6 .

[0073] Furthermore, a contact section 29 is shown here (in Figure 3 The electrical conductor 7 is guided, as it were, from the first conductor layer 5 into the second conductor layer 6 via the contact section 29 .

[0074] Furthermore, an overlapping section 9 is shown here. As can be seen, the acoustic unit 1 comprises a plurality of overlapping sections 9, wherein for the sake of clarity only one overlapping section 9 is provided with a reference numeral.

[0075] Furthermore, the current 13 is shown with the aid of arrows. The solid arrows indicate the current 13 in the first conductor layer 15 or the first conductor segment 8a shown here, and the dashed arrows indicate the current 13 in the second conductor layer 5 or the second conductor segment 8b. Thus, the current 13 according to the solid arrows flows in one direction or longitudinal direction 12 in the overlap section 9. After the contact section 29, the current 13 according to the dashed arrows flows in the opposite direction or longitudinal direction 12. Thus, the current 13 flows in the two conductor segments 8a, 8b shown here in opposite directions to one another.

[0076] After the current 13 flows through the second conductor segment 8b, a connecting segment 32 is arranged. The electrical conductor 7 comprises a connecting segment 32. The connecting segment 32 connects two conductor segments 8 arranged side by side, in particular in the transverse direction 10. Thus, the connecting segment 32 shown here connects the second conductor segment 8b shown here with the conductor segment 8 not shown here, which is arranged below the first conductor segment 8a in this viewing direction. Thus, after the current 13 passes through the second conductor segment 8b and the connecting segment 32, the current 13 can flow in parallel with the current 13 in the first conductor segment 8a.

[0077] In the present embodiment, the conductor segments 8 are straight and / or parallel to each other. Additionally or alternatively, two conductor segments 8 adjacent to each other, especially in the transverse direction 10, are antiparallel to each other. This means that in two conductor segments 8 adjacent to each other, especially in the transverse direction 10, the corresponding currents 13 are antiparallel to each other or directed in the opposite direction.

[0078] Additionally or alternatively, the connecting sections are curved 32. In particular, the connecting sections 32 are curved such that they reverse the current direction of the current 13. Thus, the connecting sections 32 have a curvature of 180°. The connecting sections 32 may form a semicircle.

[0079] Furthermore, a conductor segment distance 36 is shown here. The conductor segment distance 36 is the distance between two conductor segments 8 of the conductor layers 5, 6. The conductor segment distance 36 is also the distance between two adjacent overlapping segments 9. The conductor segment distance 36 can advantageously correspond to a magnetic element width 38, in particular 50% to 200% of the magnetic element width 38. Furthermore, the conductor segments 8 are concentrated in the region between two magnetic elements 16-21 that are consecutive in the transverse direction 10 or in the region of the free space 26. The coil arrangement 4 is constructed in this way here. The magnetic element width 38 is the width of the magnetic element 16-21 in the transverse direction 10. The magnetic element width 38 can be in the vicinity of Figure 1 Seen in.

[0080] Figure 3 A second mirror plane 44 is also shown. The first mirror plane 41 is Figure 4 The second mirror plane 44 extends in the transverse direction 10 and the normal direction 11. The electrical conductor 7 and / or the conductor section 8 and / or the overlapping section 9 are mirrored at the second mirror plane 44. As can be seen here, the connecting section 32 is mirrored at the second mirror plane 44 so that it replaces the conductor layers 5, 6 during the mirroring.

[0081] Figure 4 A perspective view of an electrical conductor 7 in two conductor layers 5 , 6 and having a plurality of conductor sections 8 is shown.

[0082] Here again, a plurality of conductor sections 8 are shown, wherein for the sake of clarity only one conductor section 8 is provided with a reference symbol.

[0083] In addition, a plurality of conductor segment groups 33a-33f are shown here. The conductor segment groups 33a to 33f each include a plurality of conductor segments 8, wherein the conductor segments are grouped. That is, the conductor group distance 37 between two conductor segment groups 33a to 33f is greater than or equal to the distance between two conductor segments 8 or the conductor segment distance 36 of the conductor segment groups 33a-33f. For the sake of clarity, the conductor segment distance 36 between two adjacent conductor segments 8 is not shown here. In addition, according to the present embodiment, the conductor segment groups 33a-33f include four conductor segments 8.

[0084] The conductor group distance 37 is measured in this case such that a magnetic element 16 - 21 can be arranged between two adjacent conductor segment groups 33 a - 33 f.

[0085] It is also advantageous if the currents 13 flowing in the conductor segments 8 of the conductor segment groups 33a-33f are parallel to one another and / or point in the same direction. This is indicated by the arrows of the currents 13 of the conductor segments 8 of the conductor segment groups 33a-33f being parallel and / or pointing in the same direction.

[0086] It is also advantageous that the currents 13 in the conductor segments 8 of the mutually adjacent conductor segment groups 33a-33f are oriented oppositely to each other. For example, in this perspective view, the current 13 of the first conductor segment group 33a flows out of the plane. The current 13 of the second conductor segment group 33b adjacent thereto is oriented oppositely. That is, the current 13 flows into the plane. The current 13 of the conductor segments 8 of the third conductor segment group 33c adjacent thereto is oriented oppositely again.

[0087] Furthermore, some conductor segment groups 33a-33f are arranged in the first conductor layer 5, and some conductor segment groups 33a-33f are arranged in the second conductor layer 6. Four conductor segment groups 33a-33d are arranged in the first conductor layer 5, and two conductor segment groups 33e-33f are arranged in the second conductor layer 6.

[0088] Since the first four conductor segment groups 33a-33d are arranged in the first conductor layer 5 and the fifth and sixth conductor segment groups 33e-33f are arranged in the second conductor layer 6, they are connected to one another by means of connecting segments 32, wherein for the sake of clarity, only one connecting segment 32 is provided with a reference numeral. The conductor segments 8 are connected to one another by means of connecting segments 32, so that the conductor segments 8 of the conductor segment groups 33a-33f are followed by the conductor segments 8 of the other conductor segment groups 33a-33f. The connecting segments 32 are shown here by means of solid lines.

[0089] Furthermore, in the present exemplary embodiment, contact sections 29 are shown, which connect the conductor sections 8 of the different conductor layers 5 , 6 to one another. The contact sections 29 are each arranged between a conductor section 8 of a first conductor layer 5 and a conductor section 8 of a second conductor layer 6 .

[0090] Furthermore, the electrical conductor 7 has an input 34 and an output 35, so that the 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 is conducted through the coil arrangement 4.

[0091] Furthermore, the conductor segment groups 33a-33f have a conductor group width 40. For the sake of simplicity, only the conductor segment group 33b having the conductor group width 40 is labeled here.

[0092] against Figure 1It is explained that the conductor segment width 39 can be greater than or equal to the distance between two magnetic elements 16-21 that are consecutive in the transverse direction 10, wherein two magnetic elements 16-21 that are consecutive in the transverse direction 10 are arranged or can be arranged in different magnetic units 14-15. The same applies to the conductor segment groups 33a-33f. The conductor group width 40 can be greater than or equal to the distance between two magnetic elements 16-21 that are consecutive in the transverse direction 10, wherein two magnetic elements 16-21 that are consecutive in the transverse direction 10 are arranged or can be arranged in different magnetic units 14-15. In this case, the conductor segment width 39 of the conductor segments 8 of the conductor segment groups 33a-33f is correspondingly small, because a plurality of conductor segments 8 form the conductor segment groups 33a-33f.

[0093] Figure 4 A first mirror plane 41 is also shown. A second mirror plane 44 is Figure 3 . The coil device 4, at least one electrical conductor 7, a conductor segment 8 and / or a conductor segment group 33a-33f have symmetry, in particular mirror symmetry, wherein the coil device 4, at least one electrical conductor 7, a conductor segment 8 and / or a conductor segment group 33a-33f are mirrored at a first mirror plane 41. However, as can be seen here, the current 13 is mirrored so that they reverse their orientation during the mirroring. Here, this symmetry can be particularly applicable to the arrangement of the conductor segment 8, the conductor segment group 33a-33f, the connecting segment 32 and / or the contact segment 29. For example, if the connecting segment 32 has a bend and its mirrored counterpart has no bend, this does not necessarily destroy the symmetry described here. On the contrary, symmetry can mean that at least one electrical conductor 7, a conductor segment 8 and / or a conductor segment group 33a-33f are arranged substantially symmetrically. The connecting segment 32 and / or the contact segment 29 and the corresponding mirrored counterpart connect the two conductor segments 8 and the corresponding mirrored counterpart. The first mirror plane 41 extends here in the normal direction 11 and in the longitudinal direction 12 .

[0094] The acoustic unit 1, in particular the electrical conductor 7, the conductor segment 8, the overlapping segment 9, the conductor segment groups 33a-33f, the connecting segment 32 and / or the contact segment 29 can have symmetry according to the first mirror plane 41 and / or the second mirror plane 44. The electrical conductor 7, the conductor segment 8, the overlapping segment 9, the conductor segment groups 33a-33f, the connecting segment 32 and / or the contact segment 29 can be arranged in a mirrored manner so that they replace the conductor layers 5, 6 when mirrored at the first mirror plane 41 and / or the second mirror plane 44.

[0095] The advantage of symmetry is that it provides technical advantages, such as balanced force generation, balanced weight distribution and thus idealized vibration characteristics. Thus, repeated conductor paths between the magnets can be avoided.

[0096] Figure 4 Also shown is a middle region 45 between two conductor segment groups 33 which are adjacent in the transverse direction 10 .

[0097] Figure 5a and 5b A top view of an acoustic unit 1 with a circular electrical conductor 7 is shown. Figure 5a A first conductor layer 5 and an electrical conductor 7 arranged therein with a bent conductor section 8 are shown. Figure 5b The second conductor layer 6 and the electrical conductor 7 arranged therein with the bent conductor sections 8a-8f are shown. The two conductor layers 5, 6 are arranged one above the other. In addition, the contact section 29 is arranged between the two Figure 5a , 5b It is shown in FIG. 2 that it connects the conductor sections 8 a - 8 f of the two conductor layers 5 , 6 to one another.

[0098] In addition, Figure 5a , 5b In the example of FIG. 3 , 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 (see Figure 1 The magnetic element 20 arranged between the two magnetic elements 16, 17 is part of the second magnetic unit 15 (see Figure 1 ).and Figure 1 Compared with the two magnetic units 14, 15, the magnetic elements 16, 17, 20 shown here are not straight lines, but curved or circular. The outermost magnetic element 17 shown here is arranged in the radial direction. Figure 5a The first conductor segment group 33a and Figure 5b The innermost magnetic element 16 shown here is arranged in the radial direction. Figure 5a The conductor segment group 33b and Figure 5b The magnetic element 20 shown here in the middle in the radial direction is Figure 5a is arranged between the first and second conductor segment groups 33a, 33b, and Figure 5b The conductor segment 33a is arranged between the third and fourth conductor segment groups 33c, 33d.

[0099] also, Figure 5a Six conductor segments 8a-8f are also shown. The conductor segments 8a-8f are spaced apart from each other in the radial direction. Figure 5b Six conductor segments 8g-8l are shown. Figure 5a The corresponding conductor sections 8a-8f are connected to Figure 5bThe conductor sections 8g - 81 overlap, so that an overlapping section 9 (not shown here, however) is formed.

[0100] exist Figure 5a and 5b In the example, the current 13 is oriented so that it Figure 5a The flow is from outside to inside in the radial direction and Figure 5b Flowing from inside to outside.

[0101] In addition, Figure 5a , three outer conductor segments 8a-8c are combined into a first conductor segment group 33a. Three inner conductor segments 8d-8f are combined into a second conductor segment group 33b. Between the first conductor segment group 33a and the second conductor segment group 33b, a magnetic element 20 is arranged in the sound conversion unit 2. The two conductor segment groups 33a, 33b are connected to the connecting section 32. As can be seen here, the current 13 flows parallel to each other in the corresponding conductor segments 8a-8f of the corresponding conductor segment groups 33a, 33b. On the contrary, the currents 13 of the conductor segments 8a-8f of two adjacent conductor segment groups 33a, 33b flow in opposite directions.

[0102] and Figure 5a The same situation also applies to Figure 5b The three outer conductor segments 8g-8i are combined into a third conductor segment group 33c. In this conductor segment group 33c, the current 13 flows in parallel with each other in the conductor segments 8g-8i. The three inner conductor segments 8j-8l are combined into a fourth conductor segment group 33d. Therein, the current 13 also flows in parallel with each other in the conductor segments 8l-8l.

[0103] In contrast, the currents 13 of the conductor segments 8g - 81 of adjacent conductor segment groups 33c , 33d flow in opposite directions to each other.

[0104] The electrical conductor 7, the conductor segment 8 and / or the conductor segment groups 33a-33d are Figure 5a and 5b Symmetry, in particular point symmetry, is also present in the conductor layer 5, 6. For this purpose, a center of symmetry 42 is shown, which is arranged in the middle of the conductor layers 5, 6. Symmetry is understood here as a matter of principle, so that in Figure 5a The slight bend on the right side of the Figure 5b The bend in the lower region of the conductor section 8 destroys the symmetry, for example. In addition, the connecting section 32 of the corresponding figure also has no symmetrical counterpart. However, it is to be understood that at least the conductor sections 8 are arranged symmetrically, that is, each conductor section 8 has a symmetrical counterpart relative to the symmetry center 42. The advantage of symmetry is that Figure 4 mentioned.

[0105] Two attached Figure 6a and6b Shows the Figure 3 Two cross-sectional views. Figure 6a A cutting line AA is shown, and Figure 6b Cutting line BB is shown.

[0106] As can be seen, a mirror image line 46 is drawn. Figure 6a Combination Figure 3 As can be seen, the connecting section 32 has a mirror symmetry along the mirror line 46. The mirror image is shown by an arrow. The connecting section 32 (upper left) of the first conductor layer 5 is mapped to the connecting section 31 (lower right) of the second conductor layer 6, and vice versa. The electric conductor 7 is arranged, constructed and / or laid here so that when the connecting section 32 is mapped at the mirror line 46, the current direction of the current 13 flowing in the connecting section 32 is reversed. This leads to an advantageous laying or arrangement of the electric conductor 7. What is achieved by the mirror symmetry of the connecting section 32 at the mirror line 46 is that the current 13 in the conductor section 8 with the overlapping section 9 is parallel to each other. In addition, the wide path of the electric conductor 7 outside the conductor section 8 in the overlapping section 9 is prevented by the mirror symmetry of the connecting section 32 at the mirror line 46. This leads to mechanical balance and leads to the smallest possible conductor length of the electric conductor 7 outside the relevant permanent magnetic field 23.

[0107] The mirror symmetry of the connecting section 32 at the mirror line 46 can be a geometrical mapping or mirror symmetry and / or a functional mapping or mirror symmetry. In the geometrical mapping, the shape of the connecting section 32 is maintained. Additionally or alternatively, the size and / or dimensions of the connecting section 32 can also be maintained. The geometrical mapping can be Figure 3 As can be seen in FIG. 1 , in the geometrical mapping, the shape and / or size of the connecting section 32 is maintained. The two connecting sections 32 are curved or rounded and thus have the same shape.

[0108] Additionally or alternatively, the connecting section 32 can also have a functional mapping or a mirror symmetry. In the functional mapping, the function and purpose of the connecting section 32 are maintained. In this case, the shape and / or size may change. For example, Figure 3 The connecting sections 32 (which have a functional mirror symmetry with each other) can have different shapes and / or sizes. Figure 3 As shown, the connecting section 32 can be curved or rounded, and the related mirrored connecting section 32 can be angular. For the function and / or purpose of the connecting section 32, the shape and / or size are not important, because the connecting section connects the conductor sections 8 in the overlapping sections 9.

[0109] However, it may be advantageous if the connecting section 32 has, in particular, a substantial or approximate geometric mirror symmetry. This results in a uniform and / or mirror-image weight distribution of the electrical conductor 7, which results in improved deflection characteristics. Deviations from the geometric mapping or mirror symmetry are therefore permissible, provided that they do not have a negative impact on the vibration characteristics of the acoustic unit 1 due to an asymmetrical weight distribution, or provided that altered vibration characteristics are tolerable.

[0110] Furthermore, the connecting section 32 intersects and / or bridges the intermediate region 45. The magnetic elements 16-21 are also arranged in the intermediate region 45, such as in Figure 1 As can be seen in FIG. Only one or more magnetic elements 16 - 21 are respectively arranged in the middle region 45 . Therefore, in the provided arrangement of the acoustic unit 1 in the sound conversion unit 2 , the connecting section 32 intersects the magnetic elements 16 - 21 .

[0111] Alternatively, the connecting section 32 can protrude beyond the magnetic elements 16 - 21 in the longitudinal direction 12 . There, the permanent magnetic field 23 weakens, so that the current 13 in the connecting section 32 interacts only slightly with the permanent magnetic field 23 .

[0112] In this embodiment and preferably in Figure 3 It is also shown in FIG. 5 that in each conductor layer 5 , 6 , in particular only one connecting section 32 intersects the central region 45 and / or bridges the latter.

[0113] Figure 7 Shows Figure 4 Arrangement of the coil arrangement 4 of . Here and in order to better illustrate the mirror symmetry, all irrelevant reference numerals are omitted. Here again, the mirror line 46 is shown. In addition, at the two connecting sections 32, the mapping is shown by way of example with the aid of arrows. The connecting section 32 in the first conductor layer 5 is mapped to the connecting section 32 in the second conductor layer 6, wherein the current direction is reversed during the mapping. It should be noted here that the connecting sections 32 of the upper first conductor layer 5 are only schematically shown as if they are bent downward in the direction of the second conductor layer 6. In fact, the connecting sections are arranged so that they extend 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 extend downward.

[0114] Furthermore, the mirror symmetry of the connecting section 32 at the mirror line 46 only applies to the connecting section 32 which also has a mirror counterpart. Figure 4 and Figure 7 In the embodiment, the connecting sections 32 of the two outer pairs of conductor segment groups 33a, 33b and 33c, 33d do not have mirror-image counterparts, for example, in the first conductor layer 5. However, the coil arrangement 4 can have a larger Figure 4 and Figure 7More conductor segments 8 are shown. Thus, at least most of the connecting segments 32 can have mirror-image counterparts.

[0115] Furthermore, intermediate regions 45 between the conductor segment groups 33 are shown here, wherein only one intermediate region 45 is provided with a reference numeral. As can be seen here, a plurality of connecting segments 32 intersects and / or bridges the intermediate region 45. Furthermore, when a plurality of connecting segments 32 intersects and / or bridges the intermediate region 45, the connecting segments 32 are arranged parallel to one another. This prevents the connecting segments 32 from intersecting themselves when they intersect and / or bridge the intermediate region 45.

[0116] exist Figure 4 and Figure 7 3 and 4. It can also be seen that the conductor guide of the electrical conductor 7. According to the present embodiment, the electrical conductor 7 is arranged so that the conductor segments 8 of the conductor segment group 33 and the conductor segments of the further conductor segment group 33 are connected. Therefore, only one conductor segment 8 of each conductor segment group 33 is passed through by the current 13 until all conductor segment groups 33 are passed through. Then, the next conductor segment 8 of the first conductor segment group 33a is passed through until all conductor segment groups 33 are passed through again. This results in an advantageous and space-saving arrangement of the electrical conductor 7.

[0117] Reference numerals list 1Acoustic unit 2Sound conversion unit 3. Film 4 coil device 5First conductor layer 6 Second conductor layer 7 Electrical Conductors 8 conductor sections 9 Overlapping sections 10Horizontal direction 11 Normal direction 12 Vertical direction 13 Current 14First magnetic unit 15 Second magnetic unit 16First magnetic element 17 Second magnetic element 18Third magnetic element 19 Fourth magnetic element 20 Fifth Magnetic Element 21 Sixth Magnetic Element 22 Magnetization direction 23Permanent magnetic field 24 Conductor segment distance 25 lifting axis 26 Free Space 27 membrane materials 28 Insulation Layer 29 contact section 30First protective layer 31 Second protection layer 32 connection section 33 conductor segment groups 34 Input 35 Output 36 Conductor segment distance 37 conductor group distance 38 Magnetic element width 39 Conductor segment width 40 conductor group width 41 First mirror plane 42 Symmetry Center 43 Magnetic element distance 44 Second mirror plane 45 Middle Area 46 Mirror Line

Claims

1. An acoustic unit (1) for a sound conversion unit (2), in particular for a flat-panel loudspeaker, preferably for a static magneto-loudspeaker, the sound conversion unit being used to generate and / or detect sound waves, the acoustic unit comprising a membrane (3) and a coil arrangement (4) coupled to the membrane (3), the coil arrangement comprising 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), wherein the first and the second conductor layers (5, 6) are arranged one on top of the other, characterized in that at least some of the conductor sections (8) of different conductor layers (5, 6) have overlapping sections (9) in which the conductor sections (8) of different conductor layers (5, 6) overlap.

2. The acoustic unit according to claim 1, characterized in that At least one electrical conductor (7) is arranged in at least two conductor layers (5, 6) so that in corresponding conductor sections (8) overlapping in a common overlapping section (9), the currents (13) are oriented parallel to one another and / or in the same direction.

3. Acoustic unit according to any one or more of the preceding claims, characterized in that The conductor sections (8) and / or conductor layers (5, 6) in the overlapping section (9) are arranged one above the other in a normal direction (11) of the coil arrangement (4) and / or the acoustic unit (1).

4. Acoustic unit according to any one or more of the preceding claims, characterized in that The conductor sections (8) overlap in a transverse direction (10) or in a longitudinal direction (12) of the coil arrangement (4), and / or the overlapping section (9) extends in a transverse direction (10) and / or in a longitudinal direction (12) of the coil arrangement (4).

5. Acoustic unit according to any one or more of the preceding claims, characterized in that The conductor section (8) is designed to be straight and / or curved, in particular circular.

6. Acoustic unit according to any one or more of the preceding claims, characterized in that A plurality of, in particular at least two, preferably at least four, particularly preferably less than 20 or less than 30, conductor segments (8) arranged in a conductor layer (5, 6) together form a conductor segment group (33), wherein the conductor layer (5, 6) preferably comprises a plurality of conductor segment groups (33).

7. Acoustic unit according to any one or more of the preceding claims, characterized in that The conductor segment distance (36) and / or conductor group distance (37) between two mutually adjacent conductor segments (8) and / or conductor segment groups (33) is less than 1 mm, and / or the conductor segment distance (36) and / or conductor group distance (37) is equal to or less than the magnetic element width (38) of the magnetic element (16-21) of the sound conversion unit (1), in particular less than 5% to 75%.

8. Acoustic unit according to any one or more of the preceding claims, characterized in that The conductor segment width (39) of the conductor segment (8) and / or the conductor group width (40) of the conductor segment group (33) in the transverse direction (10) is equal to or greater than the provided magnetic element distance (43) and / or the width of a free space (26) in the transverse direction (10) between two magnetic elements (16-21) directly connected in the transverse direction (10), in particular greater than 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50%.

9. Acoustic unit according to any one or more of the preceding claims, characterized in that The at least one electrical conductor (7) is arranged such that the conductor sections (8) are arranged in series with one another.

10. Acoustic unit according to any one or more of the preceding claims, characterized in that The at least one electrical conductor (7) is arranged in such a way that an electric current (13) flowing therein can be conducted alternately, in particular multiple times, in the first and second conductor layers (5, 6).

11. Acoustic unit according to any one or more of the preceding claims, characterized in that A plurality of conductor segments (8) and / or conductor segment groups (33) are arranged side by side in at least a first and / or second conductor layer (5, 6), in particular in a lateral direction (10), and the electrical conductor (7) is arranged in such a way that the current directions (13) in the side-by-side arranged conductor segments (8) and / or conductor segment groups (33) are oriented alternately opposite to one another.

12. Acoustic unit according to any one or more of the preceding claims, characterized in that The electrical conductor (7) is arranged in a meander-shaped manner.

13. Acoustic unit according to any one or more of the preceding claims, characterized in that Between two and ten, in particular four, overlapping sections (9) are arranged next to each other in a transverse direction (10) of the coil arrangement (4).

14. Acoustic unit according to any one or more of the preceding claims, characterized in that The electrical conductor (7) is arranged in such a way that the currents (13) flowing in the conductor segments (8) of the conductor segment group (33) are oriented parallel to one another and / or in the same direction.

15. Acoustic unit according to any one or more of the preceding claims, characterized in that The electrical conductor (7) is arranged in such a way that the currents (13) of the conductor segments (8) of two mutually adjacent, in particular directly adjacent, conductor segment groups (33) are directed antiparallel and / or opposite to one another.

16. Acoustic unit according to any one or more of the preceding claims, characterized in that The at least one electrical conductor (7) comprises one or more connecting sections (32) which electrically connect the conductor sections (8) of the conductor layers (5, 6) to one another.

17. Acoustic unit according to any one or more of the preceding claims, characterized in that The at least one electrical conductor (7) comprises a contact section (29) which electrically connects conductor sections (8) of different conductor layers (5, 6) to one another.

18. Acoustic unit according to any one or more of the preceding claims, characterized in that The at least one electrical conductor (7), conductor segment (8), conductor segment group (33), connecting segment (32) and / or contact segment (29) has a symmetry, in particular a mirror symmetry and / or a point symmetry, preferably a symmetry about a mirror plane (41) and / or a center of symmetry (42).

19. Acoustic unit according to any one or more of the preceding claims, characterized in that The connecting section (32) has a mirror symmetry at a mirror line (46), so that the connecting section (32) of a conductor layer (5, 6) is mirrored onto the connecting section (32) of another conductor layer (5, 6), wherein the current direction is reversed in the mirror-image connecting sections (32) during the mirroring.

20. Acoustic unit according to any one or more of the preceding claims, characterized in that The connecting section (32) intersects with a middle region (45) of a conductor section (8) and / or a conductor section group (33), and / or the connecting section (32) intersects with a magnetic element (16-21) of a magnetic unit (14, 15) of the sound conversion unit (1) in the arrangement of the acoustic unit (1) in the sound conversion unit (2).

21. Acoustic unit according to any one or more of the preceding claims, characterized in that The electrical conductor (7) is printed using a 3D printing method and / or the acoustic unit (1), in particular the coil arrangement (4), is structured using a photolithographic method.

22. Acoustic unit according to any one or more of the preceding claims, characterized in that The coil arrangement (4) is deformation-resistant and / or the coil arrangement (4) and / or at least one, in particular both, conductor layers (5, 6) are formed from a silicon carrier material, preferably with a thickness of 50 μm.

23. Acoustic unit according to any one or more of the preceding claims, characterized in that The coil arrangement (4) is connected to the film (3) and / or the electrical conductor (7) is formed with the film (3), in particular is printed into the film material (27), and / or the coil arrangement (4), in particular the electrical conductor (7), is embedded in the film (3) and / or is surrounded by the film material (27).

24. Acoustic unit according to any one or more of the preceding claims, characterized in that The insulating layer (28) is arranged between the conductor layers (5, 6).

25. Acoustic unit according to any one or more of the preceding claims, characterized in that The acoustic unit (1) has a first and / or a second protective layer (30, 31).

26. A sound conversion unit (2) for generating and / or detecting sound waves, in particular a flat panel loudspeaker, preferably a magnetostatic loudspeaker, the sound conversion unit comprising: at least one magnetic unit (14, 15), the at least one magnetic unit comprising a plurality of magnetic elements (16-21), and at least one acoustic unit (1), It is characterized in that The acoustic unit (1) is formed according to any one or more of the preceding claims.

27. A coil arrangement (4) for an acoustic unit (1) and / or a sound conversion unit (2) according to any one or more of the preceding claims.

28. Use of a coil arrangement (4) for an acoustic unit (1) according to one or more of the preceding claims, in particular having at least one of the features mentioned in the preceding claims and in connection with the coil arrangement (4).

29. Use of an acoustic unit (1) for a coil arrangement (4) and / or a sound conversion unit (2) according to one or more of the preceding claims, the acoustic unit being formed according to one or more of the preceding claims.

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