Acoustic unit for acoustic transducer unit

Abstract

To provide an acoustic unit having coil arrangement for an acoustic transducer unit, enabling materialization of higher electromagnetic force.SOLUTION: An acoustic unit 1 is used for an acoustic transducer unit, specifically, a flat panel loudspeaker, preferably an electromagnetic force type loudspeaker. The acoustic unit includes: a film 3 for generating and / or detecting a sound wave; and a coil arrangement that is coupled to the film, and includes at least one conductive body 7. At least the one conductive body 7 includes conductive portions 8a to 8j to at least a first conductive layer 5 and a second conductive layer 6, and both of the first conductive layer and the second conductive layer are arranged in such a manner that they are vertically overlapped. At least one conductive portion of the different conductive layer includes overlapping portions 9a to 9e in which the conductive portions of the different conductive layers are overlapped.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an acoustic unit for use in an acoustic transducer unit, in particular in a flat panel loudspeaker, preferably a magnetostatic loudspeaker, for generating and / or detecting sound waves, the acoustic unit comprising a membrane and a coil arrangement coupled to the membrane and including at least one conductor, the at least one conductor including conductor portions in at least first and second conductor layers, the first and second conductor layers being arranged one above the other. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2000-345369 discloses an acoustic unit having a coil arrangement. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2000-345369 Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an acoustic unit having a coil arrangement for an acoustic transducer unit, which is capable of achieving a higher electromagnetic force. [Means for solving the problem]

[0005] The inventive solution for achieving the above object is an acoustic unit, an acoustic transducer unit, a coil arrangement, an application of the coil arrangement and an application of the acoustic unit, which have the features of the independent claims.

[0006] An acoustic transducer unit, in particular an acoustic unit for generating and / or detecting sound waves, for use in a flat panel loudspeaker, preferably a magnetostatic loudspeaker, is proposed.

[0007] The acoustic unit includes a membrane, which can be displaced to generate acoustic waves, and which can additionally or alternatively be displaced by acoustic waves to detect the acoustic waves.

[0008] The acoustic unit further comprises a coil arrangement coupled to the membrane and including at least one electrical conductor, the at least one electrical conductor including conductor portions in at least a first and a second conductor layer. An electrical signal can be applied to the electrical conductor, which generates an electrical current in the electrical conductor. When the acoustic unit is placed in the permanent magnetic field of the acoustic transducer unit, the Lorentz force causes a displacement of the membrane, which generates sound waves based on the electrical signal. Meanwhile, when the membrane is displaced by an incoming sound wave, the electrical conductor moves in the permanent magnetic field, which induces a voltage or an electrical signal. This allows the sound waves to be detected.

[0009] The first and second conductor layers are disposed so as to overlap one another vertically.

[0010] At least some of the conductor portions of the different conductor layers have overlapping portions where the conductor portions of the different conductor layers overlap.

[0011] Also preferably, the at least one conductor is arranged in the at least two conductor layers such that the currents are parallel to each other and / or point in the same direction in the respective conductor parts overlapping at the common overlapping part, which results in a higher Lorentz force, which allows for enhanced displacement when generating sound waves.

[0012] Preferably, the conductor portions and / or conductor layers in the overlapping portion are arranged so as to overlap one above the other in a normal direction to the coil arrangement and / or the acoustic unit.

[0013] Preferably, the conductor portions overlap in a lateral and / or longitudinal direction of the coil arrangement. Additionally or alternatively, preferably, the overlapping portions extend in a lateral and / or longitudinal direction of the coil arrangement.

[0014] Preferably, the conductor portions are straight and / or curved, in particular circular.

[0015] Preferably, a plurality of conductors, particularly at least two, preferably at least four, particularly preferably less than 20 or less than 30 conductors arranged in the conductor layer are combined to form one conductor group, and the conductor layer preferably has a plurality of conductor groups. In this way, the current can flow in a planar manner through the conductor layer. This allows the membrane to be displaced in a planar manner. Thus, one conductor group can have 2 to 20 or 30 conductors arranged in parallel and preferably parallel to each other.

[0016] Preferably, the conductor section spacing and / or conductor group spacing between two adjacent conductor sections and / or conductor section groups is less than 1 mm. Additionally or alternatively, the conductor section spacing and / or conductor group spacing is preferably equal to or less than the magnetic element width of the magnetic element of the acoustic transducer unit, in particular 5% to 75% less. Additionally or alternatively, the conductor section spacing and / or conductor group spacing may be equal to 25% to 75% or 90% of the magnetic element width. If the acoustic unit is arranged in a defined manner within the acoustic transducer unit or between two magnetic units that overlap one above the other, the area between two adjacent conductor sections and / or conductor section groups may be located below or above the magnetic elements. In the areas below or above the magnetic elements, the generated magnetic field is weakest or even vanishes, so that the effect of the conductor sections and / or conductor section groups in these areas is low.

[0017] Preferably, the transverse conductor width of a conductor section and / or the transverse conductor group width of a conductor section group is greater than or equal to the transverse width of the free space between two laterally consecutive magnetic elements, in particular 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50% greater, in this way the conductor section and / or the conductor section group protrudes at least partially into the area of ​​the magnetic element in the transverse direction, thus the conductor section and / or the conductor section group have a conductor-magnetic element overlap with the magnetic element, which can improve the effect of the displacement.

[0018] Preferably, the at least one electrical conductor is arranged such that the conductor portions are arranged in series with one another, such that the current is conducted through the conductor portions one after the other.

[0019] Preferably, the at least one conductor is arranged such that the current flowing therethrough can be conducted multiple times, in particular alternating between the first and second conductor layers.

[0020] Preferably, the conductors and / or conductor groups are arranged in parallel, particularly laterally, at least in the first and / or second conductor layers, and the conductors are arranged such that the current directions are alternately opposite to each other in the conductors and / or conductor groups arranged in parallel, which allows the Lorentz forces acting on the conductors and / or conductor groups to be oriented in the same direction.

[0021] Preferably, the conductors are arranged in a serpentine manner, which allows current to be conducted through the conductors in alternating opposite directions.

[0022] According to one refinement, 2 to 10 or 20, in particular 4 overlaps are arranged in parallel in the lateral direction of the coil arrangement.

[0023] Preferably, the conductors are arranged such that the currents flowing through the conductors of one conductor group are parallel to each other and / or point in the same direction.

[0024] According to one refinement, the conductors are arranged such that the currents in the conductor parts of adjacent, in particular two immediately adjacent, groups of conductor parts are antiparallel and / or point in opposite directions, so that the Lorentz forces are in the same direction as each other.

[0025] Preferably, the at least one conductor includes a connection portion that electrically connects conductor portions of one conductor layer to each other.

[0026] Preferably, the at least one conductor includes a contact portion that electrically connects conductor portions of different conductor layers to each other.

[0027] Preferably, the connections have a mirror symmetry on the mirroring line, so that the connections of one conductor layer are mapped to the connections of the other conductor layer. The connections are therefore arranged, constructed and / or laid down with a mirror symmetry on the mirroring line. With regard to this mirror symmetry on the mirroring line, the direction of the currents in the connections mirrored to each other are reversed when mirroring. This allows for an advantageous and space-saving layout of the conductors. This also allows for a simple realization that the currents in the conductors sharing an overlap are parallel to each other and / or run along and / or in the same direction. Of course, this mirror symmetry only applies to connections that have a mirroring partner.

[0028] The connection part preferably also crosses an intermediate region of the conductor part and / or the conductor part group. The intermediate region is arranged between two adjacent conductor parts, respectively. Additionally or alternatively, the intermediate region may be arranged between two adjacent conductor part groups, respectively. Additionally or alternatively, the connection part crosses a magnetic element of a magnetic unit of the acoustic transducer unit, if the acoustic unit is arranged in a predefined manner on the acoustic transducer unit. This reduces the influence of interference of currents in the area outside the conductor part.

[0029] Preferably, the connection parts are arranged in a region outside the magnetic element along the longitudinal direction of the magnetic element, such that the permanent magnetic field of the magnetic element is weakened in the region near or outside the magnetic element, and therefore the current in the connection parts only weakly interacts with the permanent magnetic field.The connection parts therefore protrude from each end of the magnetic element.

[0030] According to one refinement, the conductors are printed by 3D printing, which allows for a simple construction of the acoustic unit.

[0031] Furthermore, the acoustic unit, in particular the coil arrangement, is preferably manufactured by lithography in semiconductor technology, which allows the coil arrangement to be manufactured with very small structures and with very low tolerances. The coil arrangement may be arranged on and / or connected to a membrane, in particular a flexible membrane. For example, the coil arrangement may be glued to the membrane.

[0032] Preferably, the coil arrangement is resistant to deformations, so that it can be displaced as a unit and does not deform in that case, so that the current is conducted and maintained directionally between the magnetic elements with low tolerances, deformations of the coil arrangement may lead to the conduction of current to positions where it should not be conducted and / or to acoustically unfavourable movement patterns of the membrane and / or acoustic unit.

[0033] Also preferably, the coil arrangement and / or at least one of the two conductor layers, in particular both conductor layers, are made of a silicon carrier material. In this case, the electrical conductors can be incorporated into the conductor layers, which combines a manufacturing method using semiconductor technology with resistance to deformation. The coil arrangement may have a thickness of, for example, 50 μm.

[0034] Preferably, the membrane is flexible, so that the membrane is displaceable and the coil arrangement remains rigid and / or resistant to deformation.

[0035] According to one advantageous refinement of the invention, the coil arrangement is preferably connected to the membrane and / or the membrane is provided with electrical conductors, the electrical conductors being in particular printed on the membrane material.

[0036] Preferably, the coil arrangement, and in particular the electrical conductors, are embedded in the membrane and / or surrounded by membrane material, which makes it possible to form a robust connection between the coil arrangement or the electrical conductors and the membrane.

[0037] Preferably, an insulating layer is disposed between the conductor layers, which allows current to be conducted through the conductors in a predetermined manner.

[0038] Preferably, the acoustic unit comprises a first and / or second protective layer, which can protect the electrical conductors, for example against oxidation.

[0039] Further proposed is an acoustic transducer unit for generating and / or detecting sound waves, in particular a flat panel speaker, preferably a magnetostatic speaker.

[0040] The acoustic transducer unit has at least one magnetic unit including a plurality of magnetic elements, and the at least one magnetic unit can generate a permanent magnetic field. Preferably, the acoustic transducer unit includes at least two magnetic units, each of which preferably includes a plurality of magnetic elements.

[0041] The acoustic transducer unit comprises at least one acoustic unit configured according to one or more of the above and / or below features, where the acoustic unit is preferably arranged in the permanent magnetic field of said at least one magnetic unit. The acoustic unit comprises said at least one electrical conductor to which a current can be applied. When a current flows through the electrical conductor, a Lorentz force is formed in the permanent magnetic field, which displaces the membrane and generates sound waves. On the other hand, when the membrane displaces together with the electrical conductor, a voltage is induced, which allows the sound waves to be detected.

[0042] A coil arrangement for an acoustic unit and / or an acoustic transducer unit is further proposed having at least one of the above and / or below mentioned characteristics.

[0043] Further proposed is an application of a coil arrangement having at least one of the features mentioned above and / or below, and the features relating to the coil arrangement, for an acoustic unit configured according to one or more of the features mentioned above and / or below.

[0044] The acoustic unit is constructed according to the above description, where the features mentioned may be applied alone or in any combination.

[0045] The application of an acoustic unit having at least one of the above and / or below features to a coil arrangement and / or an acoustic transducer unit constructed according to one or more of the above and / or below features is further proposed. [Brief description of the drawings]

[0046] Further advantages of the present invention are illustrated in the following examples, which are shown in the following figures. [Figure 1] FIG. 2 is a schematic cross-sectional side view of an acoustic transducer unit having two magnetic units and one acoustic unit. [Diagram 2]FIG. 2 is a schematic cross-sectional side view of an acoustic unit having two conductor layers and one conductor. [Diagram 3] FIG. 2 is a schematic top view of an acoustic unit having a conductor. [Figure 4] FIG. 2 is a perspective view of a conductor located on two conductor layers and having multiple conductor portions. [Figure 5a] FIG. 2 is a top view of a circular conductor located on a first conductor layer. [Figure 5b] FIG. 2 is a top view of a circular conductor located on a second conductor layer. [Figure 6a] FIG. 4 is a cross-sectional view taken along the cutting plane AA in FIG. [Figure 6b] 4 is a cross-sectional view taken along the cutting plane BB in FIG. [Figure 7] FIG. 5 corresponds to FIG. 4, where only the most important reference symbols and mirroring lines are shown. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0047] 1 is a schematic cross-sectional side view of an acoustic transducer unit 2 with two magnetic units 14, 15 and an acoustic unit 1. The acoustic unit 1 further comprises a membrane 3 and a coil arrangement 4. By means of the acoustic transducer unit 2 sound waves can be generated and / or detected. The acoustic transducer unit 2 can for example be a flat panel speaker or preferably a magnetostatic speaker. By means of the acoustic unit 1 or the acoustic transducer unit 2 sound waves can be generated and / or detected.

[0048] The two magnetic units 14, 15 shown here can form a permanent magnetic field 23 acting on the acoustic unit 1. The acoustic unit 1 is disposed in the permanent magnetic field 23. According to this embodiment, the acoustic unit 1 is disposed between these two magnetic units 14, 15.

[0049] According to this embodiment, the magnetic units 14, 15 each further comprise a number of magnetic elements 16-21. These magnetic elements 16-21 each have a magnetization direction 22, whereby a permanent magnetic field 23 is generated. For clarity, only one magnetization direction 22 is labeled with a reference. 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, whereby the three magnetic elements 16-18 are arranged above the acoustic unit 1 and the three magnetic elements 19-21 are arranged below the acoustic unit 1. The acoustic unit 1 is arranged between the magnetic elements 16-21.

[0050] As also shown in the figure, these two magnetic units 14, 15 are offset from one another such that the magnetic elements 16-21 of one magnetic unit 14, 15 are located between the magnetic elements 16-21 of the other magnetic unit 14, 15. As also shown in the figure, a free space 26 is provided between the magnetic elements 16-21 of one magnetic unit 14, 15 and the adjacent magnetic elements 16-21 in the lateral direction 10 of the other magnetic unit 14, 15. For clarity, only one free space 26 is labeled with a reference number.

[0051] The coil arrangement 4 further comprises at least one electrical conductor 7 to which an electric signal can be applied, which allows the formation of an electric current 13 in the electrical conductor 7, which is also shown here. The electric current 13 in the permanent magnetic field 23 creates a Lorentz force, which displaces the acoustic unit 1 and thus the membrane 3 along the lifting axis 25. This generates sound so that the acoustic transducer unit 2 operates as a loudspeaker. On the other hand, the displacement of the membrane 3 along the lifting axis 25 due to incoming sound induces a measurable voltage in the electrical conductor 7, which allows sound waves to be detected and the acoustic transducer unit 2 to operate as a microphone.

[0052] The conductor 7 further comprises at least one conductor part 8. The conductor 7 in this embodiment comprises several conductor parts 8, but here only one conductor part 8 is referenced. The conductor part 8 is preferably arranged in the acoustic transducer unit 2 in the region of the free space 26. In the region of the free space 26, the permanent magnetic field 23 is designed most advantageously for the displacement of the membrane 3. In the transverse direction 10 of the acoustic unit 1 or the acoustic transducer unit 2, the conductor part 8 is preferably arranged in the vicinity of and / or between the magnetic elements 16-21. In the conductor part 8, the current 13 can flow in the permanent magnetic field 23, preferably perpendicular to the permanent magnetic field 23.

[0053] Also shown here is a normal direction 11, parallel to the lift axis 25. Also shown is a longitudinal direction 12. The conductors 8 are preferably aligned in the longitudinal direction 12. Also shown here is the transverse direction 10 already described.

[0054] 1 also shows a magnetic element spacing 43 between two successive magnetic elements 16-21 in the lateral direction 10. As shown, the magnetic element spacing 43 is defined between two magnetic elements 16-21 that are successive in the lateral direction 10 and that are disposed in different magnetic units 14, 15.

[0055] The conductor portion 8 further has a conductor portion width 39. For the sake of simplicity, only one conductor portion 8 is labeled with the conductor portion width 39. According to this embodiment, the conductor portion width 39 is such that it is adjacent to the adjacent magnetic elements 16, 19 in the lateral or transverse direction 10. According to this embodiment, the conductor portion width 39 is the same as the magnetic element spacing 43 between two magnetic elements 16-21 immediately adjacent in the transverse direction 10. Moreover, these two magnetic elements 16-21 immediately adjacent in the transverse direction 10 are arranged in two different magnetic units 14, 15. Additionally or alternatively, the conductor portion width 39 may be larger, for example 5% to 50% larger, than the magnetic element spacing 43 between two magnetic elements 16-21 immediately adjacent in the transverse direction 10. Thus, the conductor portion 8 protrudes in the transverse direction 10 into the area of ​​the magnetic elements 16-21. Thus, the conductor portion 8 has a conductor-magnetic element overlap with the magnetic elements 16-21. This can improve the effect of displacement of the acoustic unit 1 or the membrane 3. Additionally or alternatively, the conductor width 39 may be larger than the width of the free space 26, for example by 5% to 50%.

[0056] Also as shown in the figure, the acoustic unit 1 is arranged between these two magnetic units 14, 15, which are stacked one on the other, such that the intermediate regions 45 between the conductors 8 and / or the conductor groups 33 below are arranged above and / or below the corresponding magnetic elements 16-21 along the normal direction 11. In these regions above or below the magnetic elements 16-21, the magnetic field 23 is weak or vanishes, so that the conductors 8 and / or the conductor groups 33 here have a low effect. For clarity, only one intermediate region 45 is referenced. The acoustic unit 1 can have multiple intermediate regions 45. The intermediate regions 45 extend in the transverse direction 10 and / or in the longitudinal direction 12. The conductors 8 are arranged side by side and / or parallel to the transverse direction 10, so that the intermediate regions 45 are formed. The intermediate regions 45 are arranged between two adjacent conductors 8, respectively.

[0057] For the sake of brevity, features that have already been described in at least one previous figure may not be described again. Some features may be described only in this figure or at least one of the following figures. For the sake of brevity, the same reference numbers are used for the same features. For the sake of clarity, not all features may be shown and / or labeled in the following figures. However, features shown in one or more of the previous figures may also be present in this figure or in one or more of the following figures. For the sake of clarity, some features may only be shown and / or labeled in this figure or in one or more of the following figures. Nevertheless, features shown in only one or more of the following figures may already be present in this figure or in the previous figures.

[0058] FIG. 2 is a schematic cross-sectional side view of an acoustic unit 1 having two conductor layers 5 and 6, a conductor 7, and a plurality of conductor portions 8a to 8j.

[0059] Here, a plurality of conductor portions 8a-8j are shown. The conductor 7 here comprises said plurality of conductor portions 8a-8j. The conductor portions 8a-8j extend in a vertical direction 12 and / or are spaced apart from one another in a horizontal direction 10. A current 13 can flow in each of the conductor portions 8a-8j.

[0060] The acoustic unit 1 further includes at least two conductor layers 5, 6 arranged so as to overlap one above the other, particularly in the normal direction 11. The at least two conductor layers 5, 6 have conductor portions 8a to 8j arranged thereon, respectively. In this embodiment, the first, second, third, fourth and fifth conductor portions 8a to 8e are arranged on the first conductor layer 5. The sixth, seventh, eighth, ninth and tenth conductor portions 8f to 8j are arranged on the second conductor layer 6.

[0061] At least some of the conductor portions 8a-8j of the different conductor layers 5, 6 have overlapping portions 9a-9e where the conductor portions 8a-8j of the different conductor layers 5, 6 overlap. In the overlapping portions 9a-9e, at least two of the conductor portions 8a-8j, that is, in particular one of the conductor portions 8a-8j of each of the conductor layers 5, 6, overlap.

[0062] As a result, in the embodiment of Fig. 2, the first conductor portion 8a and the sixth conductor portion 8f overlap to form a first overlapping portion 9a. Also, in the embodiment of Fig. 2, the second conductor portion 8b and the seventh conductor portion 8g overlap to form a second overlapping portion 9b. The third conductor portion 8c and the eighth conductor portion 8h overlap to form a third overlapping portion 9c. The fourth conductor portion 8d and the ninth conductor portion 8i overlap to form a fourth overlapping portion 9d. The fifth conductor portion 8e and the tenth conductor portion 8j overlap to form a fifth overlapping portion 9e.

[0063] The overlapping portions 9a to 9e are disposed or formed between the corresponding conductor portions 8a to 8j. In the corresponding overlapping portions 9a to 9e, the corresponding conductor portions 8a to 8j are disposed at intervals from one another in a normal direction 11 parallel to the lift shaft 25. The overlapping portions 9a to 9e extend in the horizontal direction 10 and the vertical direction 12, and are disposed between the corresponding conductor portions 8a to 8j that overlap vertically in these two directions 10 and 12.

[0064] Also shown in each conductor portion 8a-8j is a current 13. For clarity, not all currents 13 in conductor portions 8a-8j are labeled with reference numbers.

[0065] As can be further seen, in the first conductor portion 8a and the sixth conductor portion 8f having a common first overlap portion 9a, the currents 13 are parallel to each other and flow out of the plane of the paper in this figure. In the second conductor portion 8b and the seventh conductor portion 8g having a common second overlap portion 9b, the currents 13 are parallel to each other and flow in the plane of the paper in this figure. In the third conductor portion 8c and the eighth conductor portion 8h having a common third overlap portion 9c, the currents 13 are parallel to each other and flow out of the plane of the paper in this figure. In the fourth conductor portion 8d and the ninth conductor portion 8i having a common fourth overlap portion 9d, the currents 13 are parallel to each other and flow in the plane of the paper in this figure. In the fifth conductor portion 8e and the tenth conductor portion 8j having a common fifth overlap portion 9e, the currents 13 are parallel to each other and flow out of the plane of the paper in this figure.

[0066] Therefore, preferably, in each of the conductor parts 8a to 8j having a common overlapping portion 9a to 9e, the current 13 is parallel to the corresponding conductor parts 8a to 8j. Also, preferably, in each of the conductor parts 8a to 8j in which the overlapping portions 9a to 9e are arranged in parallel (particularly immediately adjacent) in the horizontal direction 10, the current 13 flowing therethrough is directed in the opposite directions. This means that in the conductor parts 8a to 8j in which the overlapping portions 9a to 9e are arranged in parallel, particularly immediately adjacent, preferably in the horizontal direction 10, the current 13 flows alternately in one direction and the opposite direction. As a result, as shown in FIG. 2, the current 13 flows outside the paper plane in the conductor parts 8a to 8j in one overlapping portion 9a to 9e, and flows inside the paper plane in the conductor parts 8a to 8j in the overlapping portions 9a to 9e that are continuous in the horizontal direction 10.

[0067] Also shown here is the membrane 3 of the acoustic unit 1. The membrane 3 is also displaced by the Lorentz force acting on the conductor 7 in the permanent magnetic field 23. The membrane 3 can have a membrane material 27. The conductor 7, which comprises the conductor parts 8a-8j, is bonded to the membrane 3. For example, the conductor 7 can be glued to the membrane 3 or to the membrane material 27. Particularly preferably, the conductor 7 is printed on the membrane 3 or to the membrane material 27 by a 3D printing method. In addition to or instead of the conductor 7, the membrane material 27 can also be printed by a 3D printing method.

[0068] The coil arrangement 4 further comprises at least one contact portion 29 electrically connecting together the conductor portions 8a-8j of different, in particular overlapping, conductor layers 5, 6. Additionally or alternatively, said at least one contact portion 29 may also be printed by a 3D printing method.

[0069] The acoustic unit 1 shown here further comprises an insulating layer 28 disposed between the two conductor layers 5, 6 and / or electrically insulating the two conductor layers 5, 6 from each other, so that the conductor portions 8a, 8j of the respective conductor layers 5, 6 are electrically insulated from each other. In this case, the conductor portions 8a, 8j of the respective conductor layers 5, 6 are electrically connected to each other only by the at least one contact portion 29.

[0070] Preferably, as shown in this embodiment, the acoustic unit 1 has at least one protective layer 30, 31. The at least one protective layer 30, 31 can protect the conductor 7 or the conductor portions 8a to 8j. Here, two protective layers 30, 31 are shown, i.e., one protective layer 30, 31 on each side of the other.

[0071] 3 is a schematic top view of the acoustic unit 1 having the conductor 7. As shown in the figure, the conductor 7 is arranged in a meandering manner. The conductor 7 passes through the conductor layers 5 and 6 in a meandering manner.

[0072] Also shown here are the two conductor layers 5, 6. The conductor 7 shown here with hatching is arranged on the first conductor layer 5. The conductor 7 shown on the left side of the figure without hatching is arranged on the second conductor layer 6. The second conductor layer 6 is arranged, for example, below the first conductor layer 5 in this viewing direction.

[0073] By way of example, here two conductor parts 8a, 8b are also referenced, where the first conductor part 8a is arranged on the first conductor layer 5 and the second conductor part 8b is arranged on the second conductor layer 6.

[0074] Also shown here is a contact portion 29 (lower left in FIG. 3). It can be said that the conductor 7 is guided from the first conductor layer 5 to the second conductor layer 6 by this contact portion 29.

[0075] Also shown here is an overlapping portion 9. As shown in the figure, the acoustic unit 1 includes multiple overlapping portions 9, but for clarity only one overlapping portion 9 is labeled with a reference number.

[0076] Moreover, the current 13 is indicated by an arrow. The solid arrow represents the current 13 in the first conductor layer 5 or the first conductor portion 8a shown here, and the dashed arrow represents the current 13 in the second conductor layer 6 or the second conductor portion 8b. Thus, the current 13 flows in one direction or vertical direction 12 in the overlapping portion 9 according to the solid arrow. After the contact portion 29, the current 13 flows in the opposite direction or vertical direction 12 according to the dashed arrow. Thus, the current 13 flows in the two conductor portions 8a, 8b shown here in opposite directions to each other.

[0077] After the current 13 flows through the second conductor portion 8b, a connection portion 32 is provided. The conductor 7 includes a connection portion 32. The connection portion 32 in particular connects two conductor portions 8 arranged in parallel in the lateral direction 10. The connection portion 32 shown here thereby connects the second conductor portion 8b shown here with a conductor portion 8 (not shown) arranged below the first conductor portion 8a in this viewing direction. In this way, the current 13 can flow parallel to the current 13 in the first conductor portion 8a after flowing through the second conductor portion 8b and the connection portion 32.

[0078] In this embodiment, the conductor portions 8 are straight and / or parallel to each other. Additionally or alternatively, two conductor portions 8, particularly adjacent in the lateral direction 10, are anti-parallel to each other. That is, in two conductor portions 8, particularly adjacent in the lateral direction 10, the respective currents 13 are anti-parallel or point in opposite directions to each other.

[0079] Additionally or alternatively, the connection portion 32 is curved. In particular, the connection portion 32 is curved to reverse the current direction of the current 13. Thus, the connection portion 32 is curved by 180°. The connection portion 32 may be semicircular.

[0080] Also shown here is a conductor section interval 36. The conductor section interval 36 is the interval between two conductor sections 8 of one conductor layer 5, 6. The conductor section interval 36 is also the interval between two adjacent overlapping sections 9. Preferably, the conductor section interval 36 may correspond to a magnetic element width 38, in particular 50% to 200% of the magnetic element width 38. Also, the conductor sections 8 are concentrated in the region between two successive magnetic elements 16-21 in the lateral direction 10 or in the region of the free space 26. In this case, the coil arrangement 4 is configured in this way. The magnetic element width 38 is the width of the magnetic elements 16-21 in the lateral direction 10. The magnetic element width 38 is shown in FIG. 1.

[0081] Also shown in Fig. 3 is a second mirror surface 44. In Fig. 4 is a first mirror surface 41. The second mirror surface 44 extends in the lateral direction 10 and in the normal direction 11. The conductors 7 and / or the conductor portions 8 and / or the overlapping portions 9 are mirrored at the second mirror surface 44. As shown, the connection portions 32 are mirrored at the second mirror surface 44 so as to switch the conductor layers 5, 6 when mirrored.

[0082] FIG. 4 is a perspective view of a conductor 7 located on two conductor layers 5, 6 and having a number of conductor portions 8.

[0083] Again, multiple conductors 8 are shown, but for clarity only one conductor 8 is referenced.

[0084] Also shown here are a plurality of conductor portion groups 33a to 33f. Each of the conductor portion groups 33a to 33f includes a plurality of grouped conductor portions 8. That is, a conductor group interval 37 between two conductor portion groups 33a to 33f is equal to or greater than the interval between two conductor portions 8 or the conductor portion interval 36 of one of the conductor portion groups 33a to 33f. For clarity, the conductor portion interval 36 between two adjacent conductor portions 8 is not shown here. Also, according to this embodiment, one conductor portion group 33a to 33f includes four conductor portions 8.

[0085] Here, the conductor group interval 37 has a fixed dimension so that one magnetic element 16-21 can be disposed between two adjacent conductor portion groups 33a-33f.

[0086] Also, preferably, the arrows of the currents 13 flowing in the conductors 8 of one conductor group 33a-33f are parallel to each other and / or point in the same direction. The figure shows that the arrows of the currents 13 in the conductors 8 of one conductor group 33a-33f are parallel to each other and / or point in the same direction.

[0087] Also, preferably, the currents 13 in the conductors 8 of adjacent conductor group 33a to 33f flow in opposite directions. For example, in this perspective view, the currents 13 in the first conductor group 33a flow out of the plane of the paper. The currents 13 in the adjacent second conductor group 33b flow in the opposite direction. That is, these currents 13 flow into the plane of the paper. The currents 13 in the conductors 8 of the adjacent third conductor group 33c again flow in the opposite direction.

[0088] Some of the conductor portion groups 33a to 33f are arranged on the first conductor layer 5, and some of the conductor portion groups 33a to 33f are arranged on the second conductor layer 6. Four conductor portion groups 33a to 33d are arranged on the first conductor layer 5, and two conductor portion groups 33e to 33f are arranged on the second conductor layer 6.

[0089] The first to fourth conductor portion groups 33a to 33d are arranged on the first conductor layer 5, and the fifth and sixth conductor portion groups 33e to 33f are arranged on the second conductor layer 6, and therefore these conductor portion groups are connected by a connection portion 32. For clarity, only one connection portion 32 is referenced. Here, the conductor portions 8 are connected by the connection portion 32 such that one conductor portion 8 of one conductor portion group 33a to 33f is followed by one conductor portion 8 of another conductor portion group 33a to 33f. Here, the connection portion 32 is shown by a solid line.

[0090] This embodiment also shows contact portions 29 that connect the conductor portions 8 of the different conductor layers 5 and 6. The contact portions 29 are disposed between the conductor portions 8 of the first conductor layer 5 and the conductor portions 8 of the second conductor layer 6, respectively.

[0091] The conductor 7 also has an input 34 and an output 35 and conducts the current 13 from the input 34 to the output 35. Also, here there is only a single input 34 and a single output 35, i.e. a single conductor 7 passes through the coil arrangement 4.

[0092] Additionally, the conductor portion groups 33a to 33f have a conductor group width 40. For simplicity, the conductor group width 40 is shown for only one conductor portion group 33b.

[0093] Explaining with reference to FIG. 1, the conductor portion width 39 can be equal to or greater than the interval between two successive magnetic elements 16-21 in the horizontal direction 10, and these two successive magnetic elements 16-21 in the horizontal direction 10 are or can be arranged in different magnetic units 14-15. The same is true for the conductor portion groups 33a-33f. The conductor group width 40 can be equal to or greater than the interval between two successive magnetic elements 16-21 in the horizontal direction 10, and these two successive magnetic elements 16-21 in the horizontal direction 10 are or can be arranged in different magnetic units 14-15. Here, since the conductor portion groups 33a-33f are composed of a plurality of conductor portions 8, the conductor portion widths 39 of the conductor portions 8 in the conductor portion groups 33a-33f are accordingly smaller.

[0094] In Fig. 4, a first mirror plane 41 is also shown. In Fig. 3, a second mirror plane 44 is shown. The coil arrangement 4, the at least one conductor 7, the conductor portion 8 and / or the conductor portion group 33a-33f have a symmetry, in particular a mirror symmetry, and the coil arrangement 4, the at least one conductor 7, the conductor portion 8 and / or the conductor portion group 33a-33f are mirrored in the first mirror plane 41. However, as can be further seen here, the current 13 is mirrored such that its orientation is reversed when mirrored. Here, this symmetry may apply in particular to the layout of the conductor portions 8, the conductor portion groups 33a-33f, the connection portions 32 and / or the contact portions 29. If the connection portion 32 has for example a kink and its mirrored partner does not have a kink, this does not necessarily break the symmetry described here. Rather, symmetry may mean that the at least one conductor 7, the conductor portion 8 and / or the conductor portion group 33a-33f are arranged approximately symmetrically. The connection portions 32 and / or contact portions 29 and the corresponding mirroring partners connect the two conductor portions 8 with the corresponding mirroring partners. Here, the first mirror surface 41 extends in the normal direction 11 and in the longitudinal direction 12.

[0095] The acoustic unit 1, in particular the conductors 7, the conductor portions 8, the overlapping portions 9, the conductor portion groups 33a-33f, the connection portions 32 and / or the contact portions 29, may be symmetrical with respect to the first mirror surface 41 and / or the second mirror surface 44. Here, the conductors 7, the conductor portions 8, the overlapping portions 9, the conductor portion groups 33a-33f, the connection portions 32 and / or the contact portions 29 may be mirrored and arranged to switch the conductor layers 5, 6 when mirrored by the first mirror surface 41 and / or the second mirror surface 44.

[0096] Symmetry has the advantage that technical advantages such as balanced force generation, balanced weight distribution as well as ideal vibration characteristics are realized, and overlapping conductor paths between the magnetic bodies are avoided.

[0097] FIG. 4 also shows an intermediate region 45 between two conductor groups 33 adjacent in the lateral direction 10 .

[0098] 5a and 5b are top views of an acoustic unit 1 having a circular conductor 7. Here, FIG. 5a shows a first conductor layer 5 and the conductor 7 having curved conductor portions 8 disposed therein. FIG. 5b shows a second conductor layer 6 and the conductor 7 having curved conductor portions 8a-8f disposed therein. The two conductor layers 5, 6 are arranged so as to overlap one above the other. Also, both of FIG. 5a and 5b show a contact portion 29 connecting the conductor portions 8a-8f of these two conductor layers 5, 6.

[0099] Also, in the example of Fig. 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, members of the first magnetic unit 14 (see Fig. 1). The magnetic element 20 arranged between these two magnetic elements 16, 17 is a member of the second magnetic unit 15 (see Fig. 1). In comparison with the two magnetic units 14, 15 of Fig. 1, the magnetic elements 16, 17, 20 shown here are not linear but curved or circular. The outermost magnetic element 17 shown here is here radially arranged outside the first conductor group 33a of Fig. 5a and outside the third conductor group 33c of Fig. 5b. The innermost magnetic element 16 shown here is radially arranged inside the conductor group 33b of Fig. 5a and inside the fourth conductor group 33d of Fig. 5b. The radially central magnetic element 20 shown here is positioned between the first conductor group 33a and the second conductor group 33b in FIG. 5a, and between the third conductor group 33c and the fourth conductor group 33d in FIG. 5b.

[0100] Also, six conductor portions 8a-8f are shown in Fig. 5a. The conductor portions 8a-8f are arranged at intervals from one another in the radial direction. Six conductor portions 8g-8l are shown in Fig. 5b. Here, each of the conductor portions 8a-8f in Fig. 5a overlaps with the conductor portions 8g-8l in Fig. 5b to form overlapping portions 9, which are not shown here.

[0101] In Figures 5a and 5b, the current 13 is oriented to flow radially from outside to inside in Figure 5a and from inside to outside in Figure 5b.

[0102] Also, in FIG. 5a, three external conductors 8a-8c are combined to form a first conductor group 33a. Three internal conductors 8d-8f are combined to form a second conductor group 33b. The magnetic element 20 is disposed between the first conductor group 33a and the second conductor group 33b in the acoustic transducer unit 2. These two conductor groups 33a, 33b are connected by a connection portion 32 here. As can be further seen from this, the currents 13 flow in parallel to each other in the conductors 8a-8f of each of the conductor groups 33a, 33b. Meanwhile, the currents 13 flow in the conductors 8a-8f of the two adjacent conductor groups 33a, 33b in opposite directions to each other.

[0103] The situation in Fig. 5a also applies to Fig. 5b. Three outer conductor portions 8g-8i are combined to form a third conductor portion group 33c. In this conductor portion group 33c, current 13 flows parallel to each other in the conductor portions 8g-8i. Three inner conductor portions 8j-8l are combined to form a fourth conductor portion group 33d. In this conductor portion group, current 13 also flows parallel to each other in the conductor portions 8jl-8l.

[0104] On the other hand, the currents 13 flow in the conductors 8g to 8l of the adjacent conductor groups 33c and 33d in the opposite directions.

[0105] In Fig. 5a and 5b, the conductors 7, the conductor sections 8 and / or the conductor section groups 33a-33d likewise have symmetry, in particular point symmetry. For this purpose, a center of symmetry 42 is shown, which is arranged in the center of the conductor layers 5, 6. Here, it should be understood in principle that the symmetry is broken by a slight kink on the right side of Fig. 5a and a kink in the lower region of Fig. 5b. The connection section 32 in the respective figures also does not have a symmetric partner. However, it should be understood that at least the conductor sections 8 are arranged symmetrically, i.e. each conductor section 8 has a symmetric partner with respect to the center of symmetry 42. The advantages of symmetry have already been explained with reference to Fig. 4.

[0106] Figures 6a and 6b are two cross-sectional views according to sections AA and BB of figure 3. Figure 6a shows section AA and figure 6b shows section BB.

[0107] As shown in the figure, a mirroring line 46 is drawn. As can be seen in FIG. 6a in conjunction with FIG. 3, the connection 32 has a mirror symmetry along the mirroring line 46. The mirroring is as indicated by the arrows. The connection 32 (top left) of the first conductor layer 5 is mirrored to the connection 32 (bottom right) of the second conductor layer 6 and vice versa. Here, the conductor 7 is arranged, configured and / or laid in such a way that when mirroring the connection 32 at the mirroring line 46, the current direction of the current 13 flowing in the connection 32 is reversed. This contributes to the laying or arrangement of the conductor 7. The mirror symmetry at the mirroring line 46 of the connection 32 ensures that the currents 13 in the conductors 8 with the overlap 9 are parallel to each other. The mirror symmetry at the mirroring line 46 of the connection 32 also prevents long paths of the conductor 7 outside the conductors 8 at the overlap 9. This achieves a mechanical balance and ensures that the conductor length of the electrical conductor 7 outside the associated permanent magnetic field 23 is as short as possible.

[0108] Here, the mirror symmetry at the mirroring line 46 of the connections 32 can be geometric mirroring or mirror symmetry and / or functional mirroring or mirror symmetry. In geometric mirroring, the shape of the connections 32 is preserved. Additionally or alternatively, the size and / or dimensions of the connections 32 can also be preserved. Geometric mirroring is shown in Fig. 3, in which the shape and / or dimensions of the connections 32 are preserved. Both connections 32 are curved or circular, i.e. have the same shape.

[0109] Additionally or alternatively, the connections 32 may have functional mirroring or mirror symmetry. In functional mirroring, the function and use of the connections 32 are preserved. The shape and / or size may be changed. The connections 32 of FIG. 3 that are functional mirror symmetry with each other may have, for example, different shapes and / or sizes. For example, as shown in FIG. 3, one connection 32 may be curved or circular, and the mirrored corresponding connection 32 may be angular. The shape and / or size is not important for the function and / or use, since the connections 32 connect the conductors 8 at the overlap 9.

[0110] However, it is preferred that the connection 32 in particular has a substantial or approximate geometric mirror symmetry, which results in a uniform and / or mirrored weight distribution of the conductors 7, which further contributes to improving the displacement characteristics. Deviations from the geometric mirroring or mirror symmetry are therefore permissible, as long as the asymmetric weight distribution does not adversely affect the vibration characteristics of the acoustic unit 1 or the altered vibration characteristics are tolerable.

[0111] Furthermore, the connection portion 32 crosses and / or bridges the intermediate region 45. As shown in FIG. 1, the magnetic elements 16-21 are also arranged in the intermediate region 45. Only one or more magnetic elements 16-21 are arranged in each intermediate region 45. Therefore, when the acoustic unit 1 is arranged in the acoustic transducer unit 2 in a predetermined manner, the connection portion 32 crosses the magnetic elements 16-21.

[0112] Alternatively, the connection 32 can protrude from the magnetic elements 16-21 along the longitudinal direction 12. The current 13 in the connection 32 only weakly interacts with the permanent magnetic field 23, since the permanent magnetic field 23 is weakened here.

[0113] In this embodiment, and as can be seen more clearly in FIG. 3, in each conductor layer 5, 6, in particular only one connection 32 crosses and / or bridges the intermediate region 45.

[0114] In FIG. 7, the layout of the coil arrangement 4 of FIG. 4 is shown. Here, all irrelevant reference numbers have been omitted to better show the mirror symmetry. Here, the mirroring lines 46 are shown as well. Also, the mirroring is illustrated by arrows at the two connections 32. The connections 32 at the first conductor layer 5 are mirrored to the connections 32 at the second conductor layer 6, with the current direction being reversed during the mirroring. It should be noted here that the connections 32 of the upper first conductor layer 5 are shown simply as folded downwards towards the second conductor layer 6. In reality, these connections are arranged to extend in a plane including the first conductor layer 5. This could also be applied to the connections 32 of the second conductor layer 6, which are shown here also extending downwards.

[0115] Also, the mirror symmetry at the mirroring line 46 of the connections 32 similarly applies only to the connections 32 that have a mirroring partner. In Figures 4 and 7, the connections 32 of the outer two pairs of conductor groups 33a, 33b and 33c, 33d do not have a mirroring partner located, for example, on the first conductor layer 5. However, the coil arrangement 4 may have more conductors 8 than are shown in Figures 4 and 7. Thus, at least most of the connections 32 may have a mirroring partner.

[0116] Also shown here are intermediate regions 45 between conductor groups 33, with only one intermediate region 45 being referenced. As can also be seen, multiple connections 32 cross and / or bridge an intermediate region 45. When multiple connections 32 cross and / or bridge an intermediate region 45, they are arranged parallel to each other. This prevents the connections 32 from crossing and / or bridging the intermediate region 45.

[0117] 4 and 7 also show the routing of the conductors 7. According to this embodiment, the conductors 7 are arranged such that a conductor 8 of one conductor group 33 is followed by a conductor 8 of another conductor group 33. In this way, the current 13 flows through only one conductor 8 in each conductor group 33, respectively, until it has flowed through all conductor groups 33. It then flows through the next conductor 8 of the first conductor group 33a, until it has flowed through all conductor groups 33 again. This contributes to an advantageous and space-saving layout of the conductors 7. [Explanation of symbols]

[0118] 1 Acoustic Unit 2 Acoustic Transducer Unit 3 membrane 4 Coil arrangement 5 First Conductor Layer 6 Second Conductor Layer 7 Conductors 8 Conductor 9. Overlap 10 Horizontal 11 Normal Direction 12 Vertical 13 Current 14 First Magnetic Unit 15 Second magnetic unit 16 First magnetic element 17 Second magnetic element 18 Third magnetic element 19 Fourth magnetic element 20 Fifth magnetic element 21 Sixth magnetic element 22 Magnetization direction 23 Permanent magnetic field 24 Conductor Spacing 25 Elevation axis 26 Free space 27 Membrane Materials 28 Insulating Layer 29 Contact Part 30 First protective layer 31 Second layer of protection 32 Connection 33 Conductor Group 34 Input 35 Output 36 Conductor Spacing 37 Conductor Group Spacing 38 Magnetic element width 39 Conductor width 40 Conductor Group Width 41 First Mirror 42 Center of Symmetry 43 Magnetic element spacing 44 Second Mirror 45 Intermediate area 46 Mirroring Line

Claims

1. An acoustic transducer unit (2), in particular for use in flat panel speakers, preferably magnetostatic speakers, for generating and / or detecting sound waves, A membrane (3), a coil arrangement (4) coupled to the membrane (3) and including at least one electrical conductor (7), the at least one electrical conductor (7) including conductor portions (8) in at least first and second conductor layers (5, 6); The first and second conductor layers (5, 6) are arranged so as to overlap one another vertically in an acoustic unit (1), An acoustic unit, characterized in that at least some of the conductor portions (8) of the different conductor layers (5, 6) have overlapping portions (9) where the conductor portions (8) of the different conductor layers (5, 6) overlap.

2. 10. An acoustic unit according to claim 9, characterized in that the at least one conductor (7) is arranged in the at least two conductor layers (5, 6) such that in the respective conductor parts (8) overlapping at a common overlapping part (9), the currents (13) are parallel to each other and / or point in the same direction.

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

4. the conductor portions (8) overlap laterally (10) and / or longitudinally (12) of the coil arrangement (4); and / or 10. An acoustic unit according to one or more of the preceding claims, characterized in that the overlap (9) extends in a transverse (10) and / or longitudinal (12) direction of the coil arrangement (4).

5. 10. An acoustic unit according to one or more of the preceding claims, characterized in that the conductor portion (8) is straight and / or curved, in particular circular.

6. 13. An acoustic unit according to any one or more of the preceding claims, characterized in that a plurality of conductor sections (8), in particular at least two, preferably at least four, particularly preferably less than 20 or less than 30 conductor sections (8) arranged on a conductor layer (5, 6), together form one conductor section group (33), the conductor layer (5, 6) preferably having a plurality of conductor section groups (33).

7. the conductor spacing (36) and / or conductor group spacing (37) between two adjacent conductors (8) and / or conductor groups (33) is less than 1 mm; and / or An acoustic unit according to any one or more of the preceding claims, characterized in that the conductor portion spacing (36) and / or the conductor group spacing (37) is less than or equal to the magnetic element width (38) of the magnetic elements (16-21) of the acoustic transducer unit (2), in particular 5% to 75% smaller.

8. 13. An acoustic unit according to any one or more of the preceding claims, characterized in that the conductor width (39) of the conductor portion (8) in the lateral direction (10) and / or the conductor group width (40) of the conductor portion group (33) in the lateral direction (10) is greater than or equal to a predetermined magnetic element spacing (43) and / or the width in the lateral direction (10) of the free space (26) between two consecutive magnetic elements (16-21) in the lateral direction (10), in particular by 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45% or 50% greater.

9. 10. An acoustic unit according to any one or more of the preceding claims, characterized in that the at least one conductor (7) is arranged such that the conductor portions (8) are arranged in series with one another.

10. 10. An acoustic unit according to claim 9, characterized in that the at least one conductor (7) is arranged in such a way that the current (13) flowing therein can be conducted multiple times, in particular alternating between the first and second conductor layers (5, 6).

11. 13. An acoustic unit according to any one or more of the preceding claims, characterized in that a plurality of conductor sections (8) and / or conductor section groups (33) are arranged in parallel, in particular in the lateral direction (10), at least in the first and / or second conductor layers (5, 6), and the conductors (7) are arranged such that the current directions (13) in these parallel conductor sections (8) and / or conductor section groups (33) run alternately along opposite directions.

12. 10. An acoustic unit according to one or more of the preceding claims, characterized in that the conductors (7) are arranged in a meandering manner.

13. An acoustic unit according to one or more of the preceding claims, characterized in that in the transverse direction (10) of the coil arrangement (4), 2 to 10, in particular 4 overlapping parts (9) are arranged in parallel.

14. 10. An acoustic unit according to any one or more of the preceding claims, characterized in that the conductors (7) are arranged such that the currents (13) flowing through the conductors (8) of one conductor group (33) are parallel to one another and / or point in the same direction.

15. 13. An acoustic unit according to any one or more of the preceding claims, characterized in that the conductors (7) are arranged such that the currents (13) of the conductor sections (8) of adjacent, in particular two immediately adjacent, conductor section groups (33) are antiparallel to each other and / or point in opposite directions.

16. 10. An acoustic unit according to any one or more of the preceding claims, characterized in that the at least one conductor (7) comprises one or more connection portions (32) electrically connecting the conductor portions (8) of one conductor layer (5, 6) to each other.

17. 10. An acoustic unit according to any one or more of the preceding claims, characterized in that the at least one conductor (7) comprises contact portions (29) electrically connecting conductor portions (8) of different conductor layers (5, 6) to each other.

18. 13. An acoustic unit according to any one or more of the preceding claims, characterized in that the at least one conductor (7), the conductor portion (8), the conductor portion group (33), the connection portion (32) and / or the contact portion (29) preferably have symmetry with respect to a mirror plane (41) and / or a center of symmetry (42), in particular mirror symmetry and / or point symmetry.

19. 13. An acoustic unit according to any one or more of the preceding claims, characterized in that the connections (32) have mirror symmetry on a mirroring line (46) such that a connection (32) of one conductor layer (5, 6) is mapped to a connection (32) of the other conductor layer (5, 6) and, upon mirroring, the direction of the current in the mirrored connections (32) is reversed.

20. the connection portion (32) crosses the conductor portion (8) and / or the intermediate region (45) of the conductor portion group (33); and / or 13. An acoustic unit according to any one or more of the preceding claims, characterized in that, when the acoustic unit (1) is arranged on the acoustic transducer unit (2) in a defined manner, the connection portion (32) crosses the magnetic elements (16-21) of the magnetic unit (14, 15) of the acoustic transducer unit (2).

21. the electrical conductor (7) is printed by a 3D printing method, and / or 10. Acoustic unit according to one or more of the preceding claims, characterized in that the acoustic unit (1), in particular the coil arrangement (4), is formed by lithography.

22. the coil arrangement (4) is resistant to deformations, and / or 10. An acoustic unit according to one or more of the preceding claims, characterized in that the coil arrangement (4) and / or at least one, in particular both, conductor layers (5, 6) are made from a silicon carrier material, preferably having a thickness of 50 μm.

23. the coil arrangement (4) is connected to the membrane (3) and / or the electrical conductors (7) are provided with the membrane (3), the electrical conductors (7) being in particular printed on a membrane material (27), and / or 10. An acoustic unit according to one or more of the preceding claims, characterized in that the coil arrangement (4), in particular the conductors (7), are embedded in the membrane (3) and / or surrounded by the membrane material (27).

24. 10. An acoustic unit according to claim 9, characterized in that an insulating layer (28) is arranged between the conductor layers (5, 6).

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

26. used to generate and / or detect acoustic waves; At least one magnetic unit (14, 15) including a plurality of magnetic elements (16-21); An acoustic transducer unit (2), in particular a flat panel speaker, preferably a magnetostatic speaker, comprising at least one acoustic unit (1), 13. An acoustic transducer unit, characterized in that the acoustic unit (1) is constructed according to one or more of the preceding claims.

27. A coil arrangement (4) for use in an acoustic unit (1) and / or an acoustic transducer unit (2) according to one or more of the preceding claims.

28. Application of a coil arrangement (4) to an acoustic unit (1) according to one or more of the preceding claims, in particular a coil arrangement (4) according to the preceding claims and having at least one feature relating to the coil arrangement (4).

29. Application of an acoustic unit (1) constructed according to one or more of the preceding claims to a coil arrangement (4) and / or an acoustic transducer unit (2) according to one or more of the preceding claims.

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