EP3427339A1

EP3427339A1 - Antenna

Info

Publication number: EP3427339A1
Application number: EP17712928.5A
Authority: EP
Inventors: Robert FELSMANN; Peter Nikles
Original assignee: Sivantos Pte Ltd
Current assignee: Sivantos Pte Ltd
Priority date: 2016-03-07
Filing date: 2017-03-03
Publication date: 2019-01-16
Anticipated expiration: 2037-03-03
Also published as: CN108701901A; DK3427339T3; CN108701901B; EP3427339B1; WO2017153274A1; US10777892B2; US20190006757A1

Abstract

The invention relates to an antenna (18), in particular for a hearing aid (4), for wireless radio communication (20, 24), comprising a coil core (26) which extends along a longitudinal direction (34) and carries a number of windings (36), and comprising a planar first shield (38) that is located on an end face (30) of the coil core (26) and is made of a ferrimagnetic and/or ferromagnetic material. The first shield (38) extends at an angle to the longitudinal direction (34) of the coil core (26). The invention further relates to a method (84) for manufacturing an antenna (18) as well as to a hearing aid (4) comprising an antenna (18).

Description

description

Antenna for wireless radio communication

The invention relates to an antenna for wireless radio communication. The antenna is in particular a component of a hearing device. The invention further relates to a method for producing an antenna and a hearing device with an antenna. The hearing aid is preferably a hearing aid.

Persons suffering from a reduction in hearing usually use a hearing aid. In this case, ambient sound is usually detected by means of an electromechanical sound transducer. The detected electrical signals are processed by means of an amplifier circuit and introduced by means of another electromechanical transducer in the ear canal of the person. Different types of hearing aids are known. The so-called "behind-the-ear devices" are carried between the skull and the auricle, and the amplified sound signal is introduced into the auditory canal using a scarf tube the hearing aid itself is inserted into the ear canal. Consequently, the auditory canal is at least partially closed by means of this hearing aid, so that no further sound - or only to a greatly reduced extent - can penetrate into the auditory canal, apart from the sound signals generated by means of the hearing aid.

If the person suffers from a hearing impairment in both ears, a hearing aid system with two such hearing aid is used. Here, each of the ears is assigned to one of the hearing aids. In order to allow the person a spatial hearing, it is necessary that the recorded with one of the hearing aids audio signals to the other hearing aid to provide. Here, the head of the person acts as attenuation in high-frequency transmissions, which is why the transmission rate between the hearing aids is limited. In addition, a transmission power is limited because of the limited energy storage of hearing aids.

The invention has for its object to provide a particularly suitable antenna for wireless radio communication and a particularly suitable method for producing an antenna and a particularly suitable hearing aid with an antenna, in particular a transmission and reception quality is improved, and preferably an energy demand and / or a space requirement is reduced.

According to the invention this object is achieved with respect to the antenna by the features of claim 1 and with respect to the method by the features of claim 1 6 and in terms of the hearing aid by the features of claim 17. Advantageous developments and refinements are the subject of the respective subclaims.

The antenna is suitable, in particular provided and / or adapted to be used in a wireless radio communication. In other words, the antenna is for wireless radio communication. Suitably, the antenna is part of a hearing aid. For example, the hearing aid is a headphone or includes a headphone. However, the hearing aid is particularly preferably a hearing aid. The hearing aid is used to support a person suffering from a reduction in hearing. In other words, the hearing aid is a medical device by means of which, for example, a partial hearing loss is compensated. The hearing aid is, for example, a "listen-in-the-canal" hearing aid (RIC), an in-the-ear hearing aid, such as an "in-the-ear" hearing aid, an "in -the-canal "- hearing aid (ITC) or a complete-in-canal hearing aid (CIC), a pair of hearing glasses, a pocket hearing aid, a bone conduction hearing aid or an implant. Particularly preferably, the hearing aid is a behind-the-ear hearing aid ("behind the ear" - hearing aid), which is worn behind an auricle. The antenna has a coil core extending along a longitudinal direction. The bobbin carries a number of turns, which are made of an electrically conductive material, such as copper-nickel, aluminum or copper. In particular, the turns are made of enameled wire, such as a copper enameled wire or a copper nickel-enameled wire. In this case, the windings surround the coil core, for example, circumferentially along the full extent in the longitudinal direction. However, particularly preferably, the spool core projects with respect to the windings in the longitudinal direction at least on one side, preferably on both sides. For example, the number of turns is between 2 turns and 200 turns, between 10 turns and 150 turns, between 20 turns and 100 turns, between 40 turns and 80 turns, and substantially equal to 60 turns, for example, deviations of 5 turns, 2 turns or no turn exists. The turns expediently extend substantially in each mutually parallel plane, which is perpendicular to the longitudinal direction, and / or all turns are preferably formed on each other. In other words, in particular, the turns are made in one piece from a component, preferably from a wire, such as the enameled wire. Suitably, the windings are electrically contacted with electronics.

The antenna further has a flat first screen, which is arranged on an end face of the spool core, the end face in particular forms a boundary of the spool core in the longitudinal direction. The first screen extends substantially in one plane, in particular along a spatial direction. The first screen thus extends at least along a surface whose curvature is comparatively low or zero. At least the main extent of the first screen in one, preferably two directions, is greater than in another spatial direction, in particular by at least twice, preferably five times or more than ten or twenty times. The directions are expediently perpendicular to each other. Preferably, the surface of the first screen is smooth. The first screen is located on the end face of the spool core and is thus offset with respect to the spool core in the longitudinal direction. Suitably, when projected onto the first screen in the longitudinal direction, the end face is completely or at least partially surrounded by the first screen and is thus imaged by it. In other words, a projection of the coil core in the longitudinal direction is at least partially, preferably completely covered by the first screen. The shape of the first screen is, for example, round, rectangular or otherwise configured. The first screen is angled to the longitudinal direction of the spool core. In other words, the plane within which the screen is located includes an angle to the longitudinal direction that is different from zero (0). In other words, the plane is not parallel to the longitudinal direction. The first screen is made of a ferrimagnetic and / or ferromagnetic material. For example, the first screen is made of the same material as the spool core.

Due to the first screen, the transmission and reception quality of the antenna is improved, since with an inductive transmission with a constant volume of the antenna, the ratio of the length of the antenna with respect to its diameter determines the performance and thus the quality of the antenna. Due to the first screen, the length of the antenna is increased, with the diameter surrounded by the turns not being increased. Although due to the first screen, the magnetic field lines are directed so that they include an angle with respect to the longitudinal direction. In other words, the magnetic field feedback is changed due to the first screen. However, this effect is comparatively weak compared to the increase in quality due to the extension of the magnetic field lines in the ferromagnetic or ferrimagnetic material of the first screen. In this case, due to the angling of the first screen with respect to the longitudinal direction, a space requirement in the longitudinal direction is reduced, so that a comparatively compact antenna is provided, which can thus also be used in a hearing device.

Preferably, by means of the antenna, if it is used in a hearing aid, audio signals and / or adjustment data are transmitted, for example between two hearing aids, each of which has such an antenna. Alternatively, for example, between a remote control and the hearing aid, which has the antenna, audio data and / or setting data transmitted. Due to the improved quality, it is not necessary to operate the antenna with a comparatively large power, and therefore an energy requirement is reduced. In particular, the antenna is operated with a power between 100 μW and 100 mW. Preferably, the effective antenna area is between 500 mm ² and 6,000 mm ² , and the inductance is preferably between 10 μΗ and 150 μΗ.

In particular, the antenna is used for inductive radio communication. Preferably, the frequency range is between 1 kHz and 300 MHz, and more preferably between 100 kHz and 30 MHz. For example, the frequency range is between 2 MHz and 5 MHz and, for example, equal to 3.2 MHz. Preferably, the first screen has a length of λ / 4 with respect to a wavelength λ selected for radio communication, with material sizes such as a permittivity ε and / or a permeability _R being expediently taken into account. For example, the antenna is used in addition to an inductive energy transfer or to an energy transmission that uses radio waves. In other words, energy is transmitted by means of the antenna, which is used, for example, to charge an energy store. In particular, this use is when the antenna is a part of the hearing aid.

For example, the first screen at a distance of less than 300 μιη, in particular of less than 100 μιτι or preferably of less than 30 μιτι arranged to the end face of the spool core. The distance is here beispielswei se greater than 10 μιτι or 50 μιτι. Particularly preferably, however, the first screen rests against the spool core without a gap. In particular, the first screen is electrically contacted with the spool core. Due to the comparatively small distance, in particular due to the absence of a gap in the gap-free system, the shaping of the magnetic field lines is further improved, which is why the quality of the antenna and thus its quality is improved. In addition, the energy needs reduced. For example, the first screen is integrally connected to the spool core, in particular by means of gluing or soldering. Alternatively, fasteners are used, such as clips or the like. In this way, a mounting is simplified, and a space requirement is further reduced.

For example, the first screen is dotted with the end face of the spool core. In other words, either the first screen or the end face of the spool core has a pin which engages / engages in a corresponding exception of the end face or the first screen. In this way, a displacement of the first screen with respect to the spool core is prevented, which increases robustness. Preferably, the spool core comprises the pin and thus engages in a corresponding recess of the first screen.

Suitably, the pin is reduced in cross section, in particular with regard to the cross section of the coil core in the area of the turns. In other words, the coil core is configured step-like in the region of the end face, wherein the height of the step preferably corresponds substantially to the thickness of the first screen. Conveniently, the size of the recess of the first screen corresponds to the reduced cross section of the spool core and is expediently smaller than the cross section of the spool core, with the exception of the spigot. Due to this, excessive insertion of the bobbin into the exception of the first screen is avoided, further simplifying assembly and increasing robustness. In a further alternative, the first screen is placed substantially dull on the end face of the spool core or at least arranged there. In other words, the first screen and the coil core on no mutually corresponding components, for example, interlock. Thus, a production of the first screen and the spool core is simplified.

For example, the screen has a thickness between 0.05 mm and 0.7 mm. In this case, the thickness in particular designates an extension of the first screen perpendicular to the plane in which the planar first screen extends, and / or which is parallel to the longitudinal direction. For example, the thickness is between 0.1 mm and 0.3 mm and preferably equal to 0.2 mm. Particularly preferably, the first screen is provided by means of a film and thus film-like. The first screen is expediently designed to be flexible, in particular elastically deformable, which simplifies mounting of the antenna, in particular in a hearing device. If the first screen is created by means of a film, manufacturing is also simplified.

Preferably, the screen is angled to the longitudinal direction, ie to the longitudinal direction of the coil core, at an angle between 45 ° and 135 °. In other words, the longitudinal direction and the plane in which the planar first screen extends form an angle between 45 ° and 135 °. More preferably, the angle is between 60 ° and 120 ° and suitably between 80 ° and 100 °. For example, the first screen is arranged substantially at right angles, that is to say at an angle of 90 ° to the longitudinal direction, with a deviation of up to 10 °, 5 °, 2 ° or 0 °, for example. In other words, the antenna is at least partially configured substantially L-shaped. Due to the comparatively large angle, the space requirement of the antenna in the longitudinal direction is comparatively low and is essentially predetermined merely on account of the expansion of the coil core. Thus, the antenna can also be arranged in a confined space, as is the case for example with a hearing aid. In addition, parts of the antenna can be arranged in areas that would otherwise not be usable.

Preferably, the material of the first screen has an electrical conductivity that is less than 10 ⁶ S / m (Siemens per meter). Preferably, the electrical conductivity (σ) is less than 100 S / m and, for example, between 1 S / m and 50 S / m, between 5 S / m and 20 S / m and substantially equal to 10 S / m, for example, a deviation of 5 S / m, 2 S / m, 1 S / m or 0 S / m. Due to the comparatively low electrical conductivity, formation of eddy currents in the first screen is reduced, which reduces the power loss. Alternatively or in combination therewith, the magnetic permeability (μη) of the first screen, which is a ferromagnetic or ferrimagnetic material, is greater than 5. For example, the magnetic permeability is greater than 100, and in particular ders preferably greater than 200, 500 or 1, 000. In this way, forming the magnetic field line by means of the first screen is comparatively efficient. Conveniently, the electrical conductivity is less than 10 ⁶ S / m and the magnetic permeability is greater than 5, and suitably the material of the first screen has an electrical conductivity of substantially 10 S / m and a magnetic permeability greater than 200. By way of example, the material of the first screen comprises a ferrite, that is to say in particular an oxidized iron, and, for example, MnZn ferrite. Suitably, the material of the first screen, but at least the ferrite, is a film or forms at least one film. In other words, the ferrite is in film form. This is for example also applied to a further component of the first screen, or the first screen is formed by means of such a film.

Particularly preferably, the antenna has a first layer, which is arranged on the underside of the first screen facing the coil core. In particular, the first layer is arranged substantially in the same plane or a plane parallel thereto as the first screen. Conveniently, the first layer is connected to the underside. The first layer is made of a material having a magnetic permeability of μ _Β smaller than 1 .000. In particular, the permeability is less than 100, and preferably less than or equal to 10 or less than or equal to 2. Preferably, the material of the first layer is different than that of the first screen. The first layer is in particular arranged in sections on the underside of the first screen or arranged on the entire surface of this. In this case, however, the first layer is particularly preferably recessed in the region of a projection of the end face of the coil core onto the first screen in the longitudinal direction. At a minimum, the area of longitudinal projection of the end face onto the first screen is free from the first layer, regardless of the size of the first layer. In other words, the first layer is recessed at least there. For example, the circumferential extent of the first layer is substantially equal to the circumferential extent of the first screen. Alternatively, the first screen overlaps the first layer at the edge or vice versa. Due to the first layer, propagation of the magnetic field lines from the bottom of the first screen toward the spool core is reduced, which substantially suppresses magnetic field feedback, thus increasing antenna efficiency and thus reducing power consumption. In addition, a shield is provided on the basis of the first layer, so that any electrical and / or electronic components arranged on the underside of the first screen are not disturbed or only to a small extent due to the magnetic fields. Also, such components do not interfere with operation or only in a comparatively small extent a signal-to-noise ratio of the antenna. In particular, due to the first layer any magnetic fields are shielded, which are caused for example by a current-carrying electrical conductor, such as a conductor of a printed circuit board, which is arranged between the bottom and the coil core, so that they contribute relatively little to a disturbance of the antenna.

For example, the material of the first layer is a paramagnetic material and thus has a permeability greater than 1 (μ _Γ > 1). Alternatively, the material is a diamagnetic material and has a permeability of between 0 and 1. In this way, propagation of the magnetic field lines away from the underside of the first screen is relatively efficiently avoided. Alternatively or particularly preferably in combination with this, the electrical conductivity of the material of the first layer is greater than 10 ⁶ S / m (Siemens per meter) and particularly preferably greater than 10 ⁷ S / m. Preferably, the permeability of the first screen is greater than the permeability of the first layer and the electrical conductivity of the material of the first layer is greater than the electrical conductivity of the first screen. As a result, eddy currents are generated substantially only in the first layer, whereas the magnetic field lines are forced into the first screen and thus substantially extend there. Due to this, the sensitivity of the antennas is increased. Also, the quality of the antenna is comparatively high, if a metallic, further component, in particular of the possible hearing aid, for example an electromechanical sound transducer (microphone), is arranged in the region of the underside, since in the first There are essentially no eddy currents and thus no eddy current losses occur.

Conveniently, the material of the first layer is an aluminum or a copper, for example, pure aluminum or pure copper, or an aluminum or. Copper alloy. In an alternative, the first layer is made of or comprises a low-permeability iron, a cobalt, a nickel or a low-permeability stainless steel, such as MAGNADUR 3952, which has a permeability <1.02. In another alternative, the material is an alloy comprising, for example, copper, aluminum, low-permeability iron, low-permeability stainless steel, cobalt or nickel. Particularly preferably, the first layer is made of a diamagnetic copper or a paramagnetic aluminum. These two materials meet the requirements and are relatively inexpensive, so manufacturing costs are reduced.

Particularly preferably, the first layer at a distance of less than 500 μιτι and preferably less than 100 μιτι and suitably applied at a distance of less than 50 μιτι on the bottom of the first screen, for example, the distance greater than 10 μιτι or 20 μιτι is. Particularly preferably, the first layer is attached gap-free on the underside of the first screen. For example, the first layer is electrically contacted with the first screen. Due to the comparatively small distance, the propagation of the eddy currents within the first layer is improved, the magnetic field lines predominantly extending in the first screen. For example, the first layer is glued or vapor-deposited onto the first screen. In this way, a production is further simplified. Alternatively, the first layer is materially connected to the first screen, for example by gluing or by means of metallization.

Preferably, the thickness of the first layer between 5 μιτι and 0.7 mm, in particular between 15 μιτι μιη and 150 μιη, advantageously between 30 μιτι and 100μιτι or between 0.05 mm and 0.7 mm, the thickness expediently perpendicular to the main propagation direction and / or perpendicular to the plane, inside half of which the first layer is arranged, is determined. In particular, the direction in which the thickness is detected is parallel to the direction in which a thickness of the first screen is determined and / or parallel to the longitudinal direction. Particularly preferably, the thickness is between 0.1 mm and 0.3 mm and, for example, substantially equal to 0.2 mm, wherein in particular a deviation of 10%, 5%, 2% or 0% is present. Particularly preferably, the first layer is designed like a film and expediently a film. For example, the first layer is elastically bendable and flexible. Due to the comparatively small dimensions of the space required is low, so mounting of the antenna is simplified. Particularly preferably, the first layer is made of a diamagnetic copper foil or a paramagnetic aluminum foil.

In particular, the first layer is used for electromagnetic radio communication. In other words, the antenna has two antenna systems, wherein one (first antenna system) is formed at least partially by means of the windings. The remaining antenna system (second antenna system) is at least partially formed by means of the first layer. The frequency range of the second antenna system is expediently between 800 MHz and 50 GHz and, for example, between 1 GHz and 30 GHz. The length of the first layer relative to the wavelength selected for radio communication, for example 3 GHz, preferably has a length of λ / 4, that is substantially between 2 and 2.5 cm. Suitably, in this case the length of the first screen is substantially at least equal. In particular, a so-called patch antenna is partially formed by means of the first layer, that is to say in particular a planar monopole.

For example, the length of the spool core in the longitudinal direction between 2.0 mm and 8.0 mm, preferably between 3.0 mm and 7.0 mm, and particularly preferably between 3.5 mm and 5.5 mm. In this way, a comparatively compact antenna is created, which can also be arranged in a hearing aid. In this case, the longitudinal direction is, for example, perpendicular or substantially perpendicular to a viewing direction of the wearer of the hearing aid. For example, the spool core is hollow. In other words, the spit is Hollow hollow cylindrical, the recess extends substantially in the longitudinal direction. Particularly preferably, the coil core is made of a soft magnetic material, such as a soft magnetic ferrite, and preferably consists of this. In particular, the spool core has a chamfer, which expediently extends in the longitudinal direction. Due to the chamfer, it is possible to influence a coupling of magnetic field lines in the coil core and thus to determine a preferred direction of the antenna.

Suitably, the coil core is cylindrical, wherein a cross section of the coil core perpendicular to the longitudinal direction, for example, is round. In particular, the cross section is completely or partially filled by means of the coil core, so that either a hollow cylindrical or a fully cylindrical coil core is provided. The diameter of the circle is for example between 0.05 mm and 3.0 mm and suitably between 0.5 mm and 2.5 mm. For example, the diameter is between 1, 0 mm and 1, 5 mm in size. Due to the round cross-section damage to the windings during assembly is substantially excluded, wherein due to the diameter of a comparatively compact spool core is provided, so that a space requirement is reduced. In addition, because of the small diameter, the ratio of the length of the antenna to the diameter is comparatively large, and therefore a quality of the antenna at a given volume of the antenna is improved.

In an alternative, the spool core has a rectangular cross-section perpendicular to the longitudinal direction, and the spool core is thus configured substantially parallelepipedic. In this case, one side of the cross section expediently has a length between 0.05 mm and 3.0 mm, for example between 0.05 mm and 2.5 mm, in particular between 0.1 mm and 2.0 mm and preferably between 0.3 mm and 1, 5 mm. In particular, the height of the cuboid coil core is thus between 0.3 mm and 1.5 mm. Alternatively or in combination, the other of the sides has a length between 0.3 mm and 8.0 mm, in particular between 0.5 mm and 6.0 mm, and preferably between 1.0 mm and 5.0 mm. In other words, the width of the cuboid coil core is between 1, 0 mm and 5.0 mm. Particularly preferably, the antenna has a second screen, which is designed flat and preferably made of a ferromagnetic and / or ferromagnetic material. The second screen is arranged on the end face of the spool core facing away from the first screen, and the second screen is angled away from the longitudinal direction of the spool core. The second screen is designed flat and thus preferably extends substantially in one plane or has only comparatively small deviations from the plane. However, at least the extent of the second screen in one, preferably two spatial directions is greater than in a third spatial direction, wherein the spatial directions are arranged perpendicular to each other. In particular, this expansion is twice, five times, ten times or twenty times greater. Preferably, the projection of the front side in the longitudinal direction is at least partially, preferably completely covered by the second screen. Due to the second screen, the transmission and reception quality of the antenna is improved.

For example, the second screen is identical in construction and / or symmetrical to the first screen, wherein the plane of symmetry expediently extends perpendicular to the longitudinal direction between the two screens. Particularly preferably, the second screen is made of the same material as the first screen. In particular, the angle which encloses the second screen to the longitudinal direction, equal to the angle of the first screen, wherein by means of the two screens and the coil core preferably a U-shape is formed. At least, however, the two screens V-shaped are arranged to each other and expediently not parallel, provided that at least one of the screens is not arranged perpendicular to the longitudinal direction. Suitably, the first screen and the second screen extend in a wing-like manner along the same spatial direction, starting from the respective end face of the spool core. For example, the second screen is dotted with the bobbin and is suitably without gaps on the bobbin. The thickness of the second screen is preferably between 0.05 mm and 0.7 mm and the permeability is suitably greater than 5, the electrical conductivity being less than 10 ⁶ S / m. In particular, the second screen is designed like a foil and in particular a foil. Particularly preferably, a second layer made of a material having a magnetic permeability of less than 1 000 is arranged at least in sections on the underside of the second screen facing the coil core. In particular, in this case the conductivity of the material of the second layer is greater than 10 ⁶ S / m. The second layer is preferably attached gap-free on the underside of the second screen and / or preferably a film. Conveniently, the second layer is substantially identical in construction to the first layer and suitably made of the same material as the first layer. Preferably, the arrangement of the second layer with respect to the second screen is substantially mirror-image to the arrangement of the first layer with respect to the first screen, the plane of symmetry being expediently perpendicular to the longitudinal direction between the two screens. In other words, the second layer is arranged symmetrically to the first layer with respect to a plane perpendicular to the longitudinal axis mirror plane. Thus, a shielded space area is created between the two screens by means of the two layers, so that there positioned any electrical and / or electronic components and electrical conductors are not or only slightly disturbed due to a magnetic field of the antenna. Also, such components have a comparatively small interference effect on the antenna, which is why a signal-to-noise ratio is increased.

Particularly preferably, the first layer and the second layer are electrically connected to each other electrically, in particular by means of a preferably flat, short-circuiting bar. Suitably, the connection is located outside of the turns. Expediently, a second antenna system is formed by means of the two layers and the connection, or the second antenna system comprises at least the two electrically interconnected layers. These are preferably used for electromagnetic radio communication. Conveniently, the frequency range is between each

800 MHz and 50 GHz, preferably between 1 GHz and 6 GHz and in particular substantially between 2 GHz and 4 GHz and is for example 2.4 GHz or 3.2 GHz. Suitably, the or each screen or the or each Layer, based on a wavelength λ selected for the respective radio communication, taking into account material sizes, in particular the permittivity ε and / or the permeability μ, has a length of λ / 4.

In the region of the coil core, the antenna preferably comprises a base for the (electrical) connection to ground, in particular to the ground of the device, provided that the antenna is used in a hearing device. Suitably, an electrical conductor, by means of which the two layers are electrically contacted with each other (short-circuit bar) is electrically connected to the foot point or forms the foot point. As a result, it is possible to adjust a resonance of the antenna formed by the two screens, and thus to adjust the efficiency of the second antenna system.

Preferably, the first screen and the spool core are formed as a continuous film structure. For example, the first screen and the spool core are made of two foils which are joined together. Particularly preferably, however, the first screen and the spool core are made of a single film and thus integral with each other. Conveniently, the bending of the first screen with respect to the spool core is realized by means of folding. In other words, the film structure is folded. For example, the antenna has the second screen, which is also a part of the film structure, and thus related to the first screen and the spool core. The film structure is for example a single-layer or multilayer film, wherein at least one of the layers expediently comprises a ferromagnetic and / or ferromagnetic material, in particular a metallic ferrite, and preferably consists thereof. For example, this layer is applied to a carrier material or the carrier material is formed by means of the ferri- or ferromagnetic material.

The film structure expediently has an electrically conductive region.

Particularly preferably, the antenna has, in the region of the windings, a printed circuit board which is connected to the spool core, preferably attached thereto. In this case, the windings surround the circuit board and the film structure circumferentially, so that the circuit board is at least partially wound by means of the windings. Due to the circuit board of the bobbin is stabilized, which simplifies a winding and thus attaching the windings. The printed circuit board is for example a glass fiber reinforced epoxy resin or a reinforced paper. Particularly preferably, the circuit board comprises an electrical connection, in particular two electrical connections, wherein at least one of the turns expediently two of the turns, electrically (directly) contacted with the electrical terminals, for example by means of bonding. In this way, a current supply and / or a tap of an electrical voltage at the windings is simplified and a contact with an electronics is simplified. In summary, in the area of the coil core, a coil (carrying printed circuit board, which carries the electrical connections connected to the windings, is arranged.

In an alternative to this, the film structure has at least partially, in particular in the region of the coil core, a first layer, a second layer and a third layer. In other words, the film structure is at least three-layered. The three layers are stacked and conveniently fastened together, for example by lamination. Alternatively, the layers are applied by means of coating, for example to one of the layers or another support structure. Here, the second layer is disposed between the first layer and the third layer. The coil core is at least partially formed by means of the second layer. In particular, the second layer is made of a soft magnetic (permeable) material, in particular a soft magnetic ferrite, or at least comprises this. The windings are preferably formed by means of the first layer and the third layer. Here, the first layer and the third layer particularly preferably conductor tracks, which by means of

Vias are connected together. Preferably, the film structure comprises one, preferably two auxiliary layers, which are arranged adjacent to the second layer between the first layer and the third layer, and the second layer, for example, surrounded at the edge. The plated through hole expediently runs in the auxiliary layers. Thus, the second layer is substantially completely surrounded, so that damage is prevented. examples For example, the film structure is configured in three layers only in the area of the coil core. Particularly preferably, the film structure is designed completely in three layers, so that the film structure can be separated out of one meter of the sheet material without subsequently requiring comparatively large laminating processes or the like.

The method for producing the antenna provides that in a first step, a sheet-like sheet or piece goods is provided. The sheet or piece goods is designed like a film and has, for example, one or more layers. In particular, at least one of the layers or the complete sheet or piece goods made of a ferromagnetic and / or ferromagnetic material is created. In a further step, the film structure is separated from the sheet or by the meter. For example, the film structure is punched or cut from the sheet or by the meter, for example by means of laser cutting or a cutter. The film structure is designed in particular substantially L-shaped or U-shaped, wherein the two mutually parallel legs will form the two screens of the antenna, and the middle part expediently at least partially the spool core. For example, the turns are subsequently applied to the film structure, in particular in the region which will form the spool core. In particular, the turns are also applied in the region which will form at least a part of one of the screens, preferably each screen. Suitably, the circuit board is first attached to the film structure. Alternatively, for example, a plated-through connection takes place between two of the layers of the film structure to form the turns. In a further step, the first screen, in particular also the second screen, if present, is angled relative to the longitudinal direction of the spool core. In other words, the film structure is angled, in particular kinked, so that the first screen and the spool core or the second screen are provided. For example, a fold is introduced into the film structure to form the first screen and the spool core. For example, the hearing aid is a headphone or includes a headphone. However, the hearing aid is particularly preferably a hearing aid. The hearing aid is used to support a person suffering from a reduction in hearing. In other words, the hearing aid is a medical device by means of which, for example, a partial hearing loss is compensated. The hearing aid is, for example, a "receiver-in-the-canal" hearing aid (RIC), an in-the-ear hearing aid, such as an "in-the-ear" hearing aid, an in-the-canal "- Hearing aid (ITC) or a" complete-in-canal "hearing aid (CIC), a hearing aid, a pocket hearing aid, a bone conduction hearing aid or an implant. Particularly preferably, the hearing aid is a behind-the-ear hearing aid ("behind the ear" - hearing aid), which is worn behind an auricle.

The hearing aid comprises an antenna for wireless radio communication. The antenna has a coil core extending along a longitudinal direction, which carries a number of turns, and a planar first screen of a ferrimagnetic and / or ferromagnetic material arranged on an end face of the coil core, which is angled away from the longitudinal direction of the coil core. The antenna preferably has the first layer,

suitably both layers, and in a space between the layers of the diamagnetic or paramagnetic material, electrical and / or electronic components are arranged, which are in particular electromagnetically disturbing components, in particular radiating conductor tracks, capacitances and / or a digital signal processor. Consequently, a space is used comparatively efficiently, wherein an influence of the antenna and the components is reduced due to the two layers. Suitably, the antenna is used for inductive radio communication, for which the windings are used. Here, the frequency range is expediently between 1 kHz and 300 MHz, preferably between 100 kHz and 30 MHz. In addition, the antenna is used for electromagnetic radio communication, for which purpose the two layers are used in particular, which are preferably electrically contacted to each other by means of the shorting bar. Here, the free Frequency range between 800 MHz and 50 GHz, preferably between 1 GHz and 6 GHz.

Suitably, the antenna, in particular independently of the hearing aid, but particularly preferably used as part of the hearing aid for inductive radio communication, wherein expediently a frequency range between 1 kHz and 300 MHz, preferably between 100 kHz and 30 MHz is used, and at the same time for electromagnetic radio communication used, wherein the frequency range here is between 800 MHz and 50 GHz, in particular between 1 GHz and 6 GHz. For example, the two radio communications are used at the same time or in succession. In other words, at the same time or in terms of time, data are transmitted inductively or electromagnetically by means of the antenna.

The invention further relates to a hearing aid system that includes, for example, two hearing aids with such an antenna, wherein the two hearing aids are at least temporarily signal technology coupled together. In this case, preferably the wireless radio communication is used, by means of which in particular data and / or settings are transmitted between the two hearing aids. Expediently, the data transmission takes place inductively, and preferably the turns are used for this purpose. Alternatively or in combination with this, the hearing device system comprises a remote control which is signal-technically coupled to at least one of the hearing devices or the hearing device by means of the wireless radio communication. In this case, an inductive transmission of data, such as configuration data or audio signals, expediently takes place. Preferably, the hearing aid system comprises a smartphone or is with a

Smartphone signal technology coupled. Appropriately, by means of the antenna wireless radio communication with the smartphone, wherein, for example, the possibly existing second antenna system is used, which suitably has at least one layer. In particular, this antenna system is used essentially for the reception of data, and the frequency range is expediently greater than 1 GHz. Since a comparatively large frequency is used, comparatively many data can be transmitted in a short time.

For example, the antenna is used in addition to the inductive energy transmission, so that in a certain operating mode by means of the antenna charging of an energy storage device of the hearing aid is possible. Suitably, the antenna thus has three operating modes, the first operating mode comprising an inductive radio communication, the second operating mode the electromagnetic radio communication and the third operating mode the inductive charging. In this case, the second operating mode is carried out, for example, at the same time as the first operating mode and / or the third operating mode, wherein the first operating mode and the third operating mode are expediently alternating.

The hearing aid system is particularly preferably a hearing aid system. The hearing aid system is used to support a person suffering from a reduction in hearing. In other words, the hearing aid system is a medical device by means of which, for example, a partial hearing loss is compensated. The hearing aid system expediently comprises a behind-the-ear hearing aid that is worn behind an auricle, a "receiver-in-the-canal" hearing aid (RIC), an in-the-ear hearing aid, such as an in-the-ear hearing aid, an in-the-canal hearing aid (ITC) or a complete-in-canal hearing aid (CIC), a pair of hearing glasses, a pocket hearing aid, a bone conduction Hearing aid or an implant. The hearing aid system is in particular provided and adapted to be worn on the human body. In other words, the hearing aid system preferably comprises a holding device, by means of which an attachment to the human body is made possible. If the hearing aid system is a hearing aid system, at least one of the hearing aids is provided and set up, for example, to be arranged behind the ear or within an auditory canal. In particular, the hearing aid system is wireless and designed and arranged to be at least partially inserted into an ear canal. Particularly preferred the hearing aid system an energy storage, by means of which a power supply is provided.

The further developments and advantages described in connection with the antenna and / or the method are analogously also to be transferred to the hearing device / hearing device system or the use and vice versa.

Embodiments of the invention will be explained in more detail with reference to a drawing. Show:

1 shows schematically a hearing aid system with two hearing aids, each comprising one antenna,

2 - 16 respectively embodiments of the antenna,

17 shows a method for producing the antenna, and

Fig. 18 schematically a sheet or by the meter.

Corresponding parts are provided in all figures with the same reference numerals.

In Fig. 1, a hearing aid system 2 is shown with two identical hearing aid devices 4, which are provided and adapted to be worn behind an ear of a user (wearer). In other words, these are behind-the-ear hearing aids ("behind-the-ear" hearing aid devices), which have a sound tube, not shown, which is inserted into the ear Each hearing aid device 4 comprises a housing 6 A microphone 8 with two electromechanical sound transducers 10 is arranged inside the housing 6. By means of the two electromechanical sound transducers 10, it is possible to change a directional characteristic of the microphone 8 by varying the time between them by means of the respective microphone The two electromechanical sound transducers 10 are signal-coupled to a signal processing unit 12, which comprises an amplifier circuit. Processing unit 12 is formed by means of circuit elements, such as electrical and / or electronic components.

Furthermore, a loudspeaker 14 is signal-coupled to the signal processing unit 12, by means of which the audio signals recorded with the microphones 8 and / or processed by the signal processing unit 12 are output as sound signals. These sound signals are conducted by means of the sound tube not shown in the ear of a user of the hearing aid system 2. The energization of the signal processing unit 12, the microphone 8 and the speaker 14 of each hearing aid 4 by means of a respective battery 16. Each of the hearing aids 4 further comprises an antenna 18, by means of which a wireless radio communication 20 is created between the two hearing aids 4. The wireless radio communication 20 is used for the exchange of data and takes place inductively. Due to the exchange of data, it is possible to give the wearer of the hearing aid system 2 a spatial sense of hearing. In summary, the hearing aid system 2 is configured binaurally.

Fermer, the hearing aid system 2 includes another device 22, which is for example a remote control or a smartphone. This has a communication device, not shown, by means of which a further wireless radio communication 24 with the two antennas 18 of the two hearing aids 4 is created. The wireless radio communication 24 is used for the exchange of data between the further device 22 and the hearing aid devices 4. In particular, in this case audio signals are transmitted, which were detected by means of the further device 22. The wireless radio communication 24 is a radio link and thus electromagnetic. In other words, a far field is used for communication.

In Fig. 2, the antenna 18 is shown in more detail in a plan view, which is used in each of the two hearing aids 4 use. The antenna 18 has a coil core 26, which is made of a soft magnetic material or at least comprises a soft magnetic material, in particular a soft magnetic ferrite. The coil core 26 is cylindrical and extends along a Longitudinal axis 28. Thus, the spool core 26 has a first end face 30 and a second end face 32 which define the spool core 26 in a longitudinal direction 34 which is parallel to the longitudinal axis 28. The extension of the spool core 26 in the longitudinal direction 34 is between 4 mm and 6 mm and equal to 5 mm. The bobbin 26 carries a number of turns 36 which form a coil with the coil substantially centered on the bobbin 26 so that the two end faces 30, 32 are spaced longitudinally 34 from the bobbin. The turns 36 are molded together and the coil is integral. The coil is made of a lacquered enameled copper wire and comprises between 50 and 70 such turns 36, which are wound around the coil core 26.

On the first end face 30, a first screen 38 is stumped, wherein the first end face 30 is completely covered by the first screen 38. Here, the first screen 38 rests against the spool core 26 without a gap. The first screen 38 is materially connected to the spool core 26, in particular glued. In other words, the first screen 38 rests against the spool core 26 without a gap. The first screen 38 is made of a film and configured flat. In other words, the first screen 38 extends substantially in one plane. The plane is perpendicular to the longitudinal direction 34, so that the flat first screen 38 is angled to the longitudinal direction 34 of the spool core 26 by an angle of 90 °. The thickness of the first screen 38, ie its extension in the longitudinal direction 34, is substantially equal to 0.2 mm and the first screen is made of a MnZn ferrite film. Thus, the material of the first screen 38 has an electrical conductivity of substantially 10 S / m and a magnetic permeability μρ greater than 200. In summary, the first screen 38 is made of a ferromagnetic or ferromagnetic material.

On the second end face 32, a second screen 40 is stumped. In other words, the distance between the first screen 38 and the second screen 40 and each of the coil core 26 is less than 300 μιτι. The second screen 40 is identical in construction to the first screen 38 and made of the same material. In other words, the second screen 40 has the same electrical as well magnetic properties such as the first screen 38 on. The second screen 40 is arranged symmetrically with respect to the first screen 38, so that when the two screens 38, 40 are projected onto a mirror plane which is perpendicular to the longitudinal direction 34, the two projections overlap. The second screen 40 is thus arranged parallel to the first screen 38. In summary, the second screen 40 is also made of the ferromagnetic or ferromagnetic material and angled to the longitudinal direction 34 of the spool core 26. In this case, the two screens 38, 40 extend from the respective end face 30, 32 in the manner of a wing along one spatial direction in each case.

At the coil core 26 zugewanden bottom 42 of the first screen 38, a first layer 44 is connected to the first screen 38 without gaps, in particular fixed and preferably glued. In other words, the first layer 44 is arranged at a distance of less than 500 μιτι to the first screen 38. The first layer 44 is also configured flat and covers the underside 42 of the first screen 38 in a region which is spaced from the spool core 26. Here, the first layer 44 is applied flat on the first screen 38 and has a thickness, ie an extension in the longitudinal direction 34, of 0.05 mm. The first layer 44 is made of a paramagnetic aluminum foil and thus has an electrical conductivity of 37.7 ^· 10 ⁶ S / m, wherein the magnetic permeability is less than 2.

As an alternative to the aluminum foil, for example, a copper foil is used. Thus, the material of the first layer 44 is a diamagnetic material. In further alternatives, the first layer 44 comprises or consists of low-permeability iron, low-permeability stainless steel, for example MAGNADUR 3952, cobalt and / or nickel. However, at least the magnetic permeability of the first layer 44 is less than 1, 000, and the electrical conductivity is greater than 10 ⁶ S / m, and the material is either para or diamagnetic.

The antenna 18 further includes a second layer 46 made of the same material as the first layer 44 and thus having the same magnetic and electrical properties. Also, the second layer 46 is made of the same Sheeting produced as the first layer 44 and connected in the same manner as the first layer 44 on the second screen 40. The second layer 46 is thus fastened on the underside 47 facing the coil core 26 and the first screen 38.

The second layer 46 is arranged symmetrically with respect to a mirror plane, which is arranged perpendicular to the longitudinal direction 34, to the first layer 44. In other words, the two layers 44, 46 are opposite. The first layer 44 and the second layer 46 are electrically contacted by a shorting bar 48 extending along the bottom 42 of the first screen 38 and the bottom 47 of the second screen 40 and along the spool core 26 in the area free of the windings 36 is. The flat configured shorting bar 48 spans the windings 36 on the outside, so this does not run inside the coil formed by the windings 36.

By means of the coil core 26, the windings 36 and the first screen 38 and the second screen 40, a first antenna system is formed which is used to produce the inductive wireless radio communication 20. In this case, the windings 36 are suitably supplied with an alternating current, so that magnetic field lines 50 form, of which only two are shown by way of example. These are formed by means of the two screens 38, 40.

Between the two layers 44, 46, a gap 52 is formed, in which due to the material of the two layers 44, 46, the number of magnetic field lines 50 is reduced. In the intermediate space 52, a further component 54 or other components is arranged, which are electromagnetically disturbing, in particular conductor tracks, a capacitor or a digital signal processor. In one variant, part of the signal processing unit 12 is located in the intermediate space 52. In other words, the further component 54 is a component of the signal processing unit 12. The magnetic field lines 50 are forced into the two screens 38, 40 due to the material of the two layers 44, 46 , which increases the transmission or reception quality of the antenna 18. Any eddy currents However, these are predominantly within the layers 44, 46, and the two screens 38, 40 are substantially free of the eddy currents, which leads to a reduced energy requirement and an increased quality in the presence of another component 54.

By means of the two layers 44, 46 and the shorting bar 48, a second antenna system is provided which serves the electromagnetic wireless radio communication 24. Both radio communications 20, 24 can be operated at the same time. In the inductive wireless radio communication 20, the selected frequency range is between 100 kHz and 30 MHz and in the electromagnetic wireless radio communication 24, the frequency range between 1 GHz and 6 GHz is used. In a further operating mode, the antenna 18, and in particular the windings 36 and the coil core 26, for inductive energy transfer and thus to charge the battery 16 is used.

In Fig. 3, a modification of the antenna 18 is shown, wherein, for example, the two layers 44, 46 are omitted. However, these are present in a further alternative, as are the shorting bar 48 and the further component 54. The first screen 38 is angled with respect to the longitudinal direction 34 at an angle of 80 °, and also the second screen 40 is also at an angle of 80 ° angled, wherein the two screens 38, 40 are not parallel to each other and thus enclose an angle of 20 ° to each other. Thus, the extension of the antenna 18 in the longitudinal direction 34 is increased, so that a quality of the antenna 18 is further improved.

In Fig. 4, the antenna 18 is shown in perspective in a further embodiment. The first screen 38 and the second screen 40 are in turn arranged parallel to each other and perpendicular to the longitudinal direction 34 of the bobbin 26, which carries an increased number of turns 36. In addition, the first screen 38 and the second screen 40 have a circular cross section perpendicular to the longitudinal direction 34, and also the spool core 26 has a round cross section perpendicular to the longitudinal direction 34. The bobbin 26 has a

Diameter between 1, 0 and 1, 5 mm, and the bobbin 26 is concentrated arranged to the two screens 38, 40. In other words, the centers of the circular screens 38, 40 lie on the longitudinal axis 28, with respect to which the coil core 26 is rotationally symmetrical. The spool core 26 is hollow in a further alternative. The two layers 44, 46 are not shown but are present in a further alternative. Here, the two layers 44, 46 are formed annular and radially slotted so that they are not rotationally symmetrical with respect to the longitudinal direction 34. This avoids excessive formation of eddy currents in the respective layers 44, 46, which would otherwise lead to a deterioration in quality. Also, the length of the spool core 26 in the longitudinal direction 34 between 2 mm and 8 mm and for example equal to 5 mm.

In Fig. 5, a further embodiment of the antenna 18 is shown. In a modification of the embodiment shown in FIG. 4, the cross section of the parallel screens 38, 40 perpendicular to the longitudinal direction 34 is rectangular or square. The cross section of the coil core 26 is also rectangular, and the coil core 26 is thus cuboidal. The extension of the spool core in the longitudinal direction 34 in the illustrated example is equal to 4 mm, and one of the sides of the rectangular cross section has a length between 0.05 mm and 3.0 mm or between 0.05 mm and 2.5 mm and the other the sides have a length between 0.3 mm and 8 mm. In particular, the lengths here are between 0.3 mm and 1.5 mm or between 1 mm and 5 mm.

6, a further embodiment of the antenna 18 is shown, wherein the two screens 38, 40 are configured substantially elliptical. The two screens 38, 40 are perpendicular to the longitudinal direction 34 in each direction via the bobbin 26 via, and each bottom 42, 47 is - with the exception of the direct contact with the bobbin 26 and the substantially radially extending slot - each with the layer 44th , 46 provided. As a result, an intermediate space 52 which essentially surrounds the bobbin 26 is formed, in which a plurality of further components 54 are arranged. Here, the two electromechanical sound transducers 10 and parts of the signal processing unit 12 to the other components 54. In addition, the bobbin 26 includes a in Longitudinal 34 extending and not shown chamfer, within which an edge of a circuit board of the signal processing unit 12 is arranged, which makes efficient use of the space. Also, the antenna 18 is stabilized in this way.

FIGS. 7 and 8 each show perspectively a further embodiment of the antenna 18. The bobbin 26 is pentagonal, and the first and second screens 38, 40 are irregular in shape. The two screens 38, 40 are parallel to one another and symmetrical with respect to a plane of symmetry which is perpendicular to the longitudinal direction 34. Furthermore, the antenna comprises two terminals 56 which are each electrically contacted with one of the windings 36. The terminals 56 are copper strips and serve to electrically contact the antenna 18 with the signal processing unit 12.

In FIG. 9, an embodiment of the antenna 18 is shown in fragmentary form along the longitudinal axis 28 in a sectional view. The first screen 38 is blunt placed on the spool core 26, wherein the distance in the longitudinal direction 34 is less than 300 μιτι. However, the first screen 38 is, for example, spaced from the spool core 26, in particular due to an adhesive layer. In the illustrated example, the first screen 38 is made of the low-permeability iron. However, it is also possible to use a low-permeability stainless steel or another ferromagnetic or ferrimagnetic material. In addition, it is possible that the second screen 40 as well as the two layers 44, 46 are present, which are not shown, nor are the turns 36.

FIG. 10 shows a modification of the antenna 18 shown in detail in FIG. The first screen 38 has a recess 58 into which the spool core 26 is inserted to form a clearance fit. The end face 30 is flush with the bottom side 42 facing away from the surface of the first screen 38. In other words, the first screen 38 with the end face 30 of the spool core 26 is zeckt. In Fig. 1 1, a further modification of the antenna 18 shown in Fig. 10 is shown. The recess 58, which is concentric to the longitudinal axis 28, is designed reduced in size, and the spool core 26 has at the end 30 facing the end in the longitudinal direction 34 a reduced cross-section pin 60. The cross section of the pin 60 perpendicular to the longitudinal direction 34 is reduced in comparison to the cross section of the spool core 26, which is spaced from the first screen 38. In other words, the spool core 26 is designed step-shaped in the region of the end face 30. The cross section of the pin 60 corresponds to the recess 58, and the extension of the pin 60 in the longitudinal direction 34 is equal to the thickness of the first screen 38, so that the coil core 34 is fixed comparatively stable on the first screen 38.

FIG. 12 shows a perspective view of a further embodiment of the antenna 18 in a top view and in FIG. 13 in a bottom view. The antenna 18 has a film structure 62, by means of which the coil core 26 and the first screen 38 and the second screen 40 is formed. The film structure 62 made of a ferrite is designed as a single layer and is essentially made of a U-shape into which two folds 64 are inserted, so that the two screens 38, 40 are angled away from the longitudinal direction 34. In a further alternative, the first screen 38 and the spool core 26 are each provided with a separate foil, but which were mechanically separated from each other and joined together. A printed circuit board 66, which is made of a glass fiber reinforced epoxy resin, is attached to the spool core 36 in the area of the turns 36. The circuit board 66 is configured U-shaped and spaced between the two screens 38, 40 are arranged. The free ends of the U-shaped printed circuit board 66 protrude into the intermediate space 52, and the windings 36 surround the middle leg of the printed circuit board 66. The printed circuit board 66 has the connections 56, which are electrically connected by means of printed conductors 68 to the coil formed by the windings 36 are. The printed circuit board 66 is glued in particular to the film structure 62.

The two layers 44, 46 are electrically contacted to one another by means of the shorting bar 58, which likewise is fastened to the printed circuit board 66 and is extensively connected. side is guided around the windings 36, so that the shorting bar 58 extends outside of the coil formed by the windings 36. Due to the circuit board 66, the coil core 26 is stabilized in the region of the turns 36. In other words, the bobbin 26 is not limp in the area, so attaching the windings 36 is simplified. In addition, due to the U-shape of the circuit board 66, which is spaced from the two screens 38, 40, the position of the windings 36 is stabilized.

In Fig. 14, one of the hearing aids 4 is shown in perspective without the housing 6 with a further embodiment of the antenna 18 in sections, wherein this is also comprised of the film structure 62. The two screens 38, 40 are wing-like and slightly curved, but nevertheless flat. In Fig. 15, the embodiment of the antenna is shown in a further perspective. The antenna 18 has a ground connection 70, which is electrically contacted with the coil core 26 or the shorting bar 48. By means of the ground connection 70, the coil core 26 or the short-circuiting bar 48 is electrically guided against a device ground of the hearing device 4. Thus, the impedance can be adjusted, which is why a resonant circuit formed by means of the antenna 18 can be set to a specific resonant frequency. The ground terminal 70 is electrically contacted with the signal processing unit 12 through which the device ground is provided.

FIG. 16 shows a further embodiment of the antenna 18, wherein only the coil core 26 is shown in a sectional view perpendicular to the longitudinal direction 34. The coil core 26 and the two screens 38, 40 are formed as the continuous film structure 62, which is, however, designed in three layers. The film structure 62 thus has a first layer 72, a second layer 74 and a third layer 76, which are designed substantially flat and stacked on top of each other, wherein the second layer 74 between the first layer 72 and the third layer 76 is disposed. The first layer 72 and third layer 76 are congruent, whereas the second layer 74 is made smaller and is spaced from an edge region of the film structure 62. The edge region is formed by means of two auxiliary layers 78, which likewise lie between the first and second th situation 72 and the third layer 76 are arranged. The composite of the second layer 74 and the auxiliary layers 78 is congruent to the first layer 72 and the third layer 76. Thus, the second layer 74 is completely shielded from the environment. The first layer 72, the second layer 74, the third layer 76 and the auxiliary layers 78 are fastened to one another by means of lamination.

The second layer 74 consists of a soft magnetic ferrite and forms the coil core 26. The first layer 72 has electrically insulated against each other interconnects 80 which are applied to an electrically insulating support of the first layer 72, and which are spaced from the second layer 74. The conductor tracks 80 of the first layer 72 extend transversely to the longitudinal direction 34 and are configured essentially in a straight line. Each trace 80 of the first layer 72 is electrically contacted at its end by vias 82, only one of which is shown passing through the auxiliary layers 78, to traces of the third layer 76 that are perpendicular or also transverse to the longitudinal direction 34, however are inclined in the opposite direction to the conductor tracks 80 of the first layer 72. By means of the interconnects 80 of the first layer 72 and the interconnects of the third layer 76 and the plated-through holes 82, the windings 36 are created, and the antenna 18 is designed to be flexible in the region of the coil core 26. By means of at least one of the conductor tracks, one of the terminals 56 is also at least partially formed. In a further alternative, the first screen 38 and the spool core 26 are provided by means of a foil, which, however, are mechanically separated from each other.

In Fig. 17, a method 84 for producing the film structure 62 having the antenna 18 is shown. In a first operation 86, a sheet-like sheet or piece goods 88 is provided, which is shown by way of example in FIG. The dimension of the sheet is for example greater than 30 cm by 30 cm, or the meter has a width of at least 10 cm and, for example, a length of about 1 m. The sheet or piece goods 88 is formed by means of a film. In other words, the film is available as a sheet or piece goods 88. The sheet or piece goods 88 is configured either single-layered or multi-layered, for example, three-ply, depending on the embodiment the antenna is provided. For example, for the antenna 18 shown in FIG. 16, the sheet or piece goods are designed in three layers.

In a second step 90, the film structure 62 is cut out of the sheet or piece goods 88 by means of punching. Following this example, the circuit board 66 is attached to the arcuate film structure 62 or it will be the vias 82 created. In particular, in the second step 90, the windings 36 are created, which are suitably electrically contacted with the terminals 56. In a subsequent third operation 92, the first screen 38 and the second screen 40, which are respectively formed by means of the two mutually parallel legs of the U-shaped film structure 62, with respect to the bobbin 26, which is formed by means of the connecting leg, angled. Thus, the two screens 38, 40 are angled to the longitudinal direction 34 of the spool core 28. By way of example, folds 64 are introduced into the film structure 62.

The invention is not limited to the embodiments described above. Rather, other variants of the invention can be derived therefrom by the person skilled in the art without departing from the subject matter of the invention. In particular, all individual features described in connection with the individual embodiments are also combinable with one another in other ways, without leaving the subject matter of the invention.

LIST OF REFERENCE NUMBERS

2 hearing aid system

4 hearing aid

6 housing

8 microphone

10 electromechanical transducer

12 signal processing unit

14 speakers

16 battery

18 antenna

20 wireless radio communication

22 more device

24 wireless radio communication

26 coil core

28 longitudinal axis

30 first end face

32 second end face

34 longitudinal direction

36 turns

38 first screen

40 second screen

42 bottom

44 first shift

46 second shift

47 bottom

48 shorting bar

50 magnetic field line

52 space

54 additional component

56 connection

58 recess

60 cones 62 film structure

64 fold

66 circuit board

68 trace

70 ground connection

72 first location

74 second location

76 third location

78 auxiliary position

80 trace of the first layer

82 through-hole

84 procedure

86 first step

88 sheet or yard goods 90 second step

92 third step

Claims

claims

1 . An antenna (18), in particular a hearing aid (4) for wireless radio communication (20, 24), comprising a coil core (26) extending along a longitudinal direction (34) and carrying a number of windings (36) and one on one End face (30) of the spool core (26) arranged flat first screen (38) made of a ferrimagnetic and / or ferromagnetic material, which is angled to the longitudinal direction (34) of the spool core (26).

2. Antenna (18) according to claim 1,

characterized,

that the first screen (38) rests without gaps on the spool core (26).

3. antenna (18) according to claim 1 or 2,

characterized,

in that the first screen (38) is fastened to the end face (30) of the spool core (26), in particular via a pin (60), reduced in cross-section, of the spool core (26).

4. Antenna (18) according to one of claims 1 to 3,

characterized,

in that the first screen (38) has a thickness between 0.05 mm and 0.7 mm, and / or that the first screen (38) is at an angle between 45 ° and 135 ° with respect to the longitudinal direction (34) of the spool core (26) is angled.

5. Antenna (18) according to one of claims 1 to 4,

characterized,

the material of the first screen (38) has an electrical conductivity of σ <1 0 ⁶ S / m and / or a magnetic permeability of μ _Γ greater than 5.

6. antenna (18) according to any one of claims 1 to 5, characterized,

a first layer (44) of a material with a magnetic permeability of μ _Γ less than 1000 is arranged on the lower side (42) of the first screen (38) facing the coil core (26).

7. antenna (18) according to claim 6,

characterized,

the material of the first layer (44) is a paramagnetic material (μ _Γ > 1) or a diamagnetic material (0 <μ _Γ <1), and / or that the electrical conductivity σ of the material of the first layer (44) is greater than 10 ⁶ S / m is.

8. antenna (18) according to claim 6 or 7,

characterized,

in that the first layer (44) is attached gap-free on the underside (42) of the first screen (38), and / or that the first layer (44) is a film.

9. antenna (18) according to any one of claims 1 to 8,

characterized,

in that the length of the spool core (26) in the longitudinal direction (34) is between 2.0 mm and 8.0 mm.

10. Antenna (18) according to one of claims 1 to 9,

characterized,

in that the coil core (26) has a round cross-section perpendicular to the longitudinal direction (34), the diameter being between 0.05 mm and 3.0 mm.

1 1. Antenna (18) according to one of claims 1 to 9,

characterized,

the coil core (26) has a rectangular cross-section perpendicular to the longitudinal direction (34), one of the sides being of a length between see 0.05 mm and 2.5 mm and the other of the sides has a length between 0.3 mm and 8.0 mm.

12. Antenna (18) according to one of claims 1 to 1 1,

characterized,

that on the first screen (38) facing away from the end face (32) of the spool core (26), a planar second screen (40) is arranged, which is angled to the longitudinal direction (34) of the spool core (26).

13. Antenna (18) according to one of the preceding claims,

characterized,

in that the first screen (38) and the coil core (26) are formed as a coherent, in particular folded, film structure (62).

14. Antenna (18) according to claim 13,

characterized,

that in the region of the turns (36) a printed circuit board (66) is connected to the spool core (26).

15. Antenna (18) according to claim 13,

characterized,

in that the film structure (62) has a first layer (72), a second layer (74) and a third layer (76), which are stacked on top of one another, wherein the coil core (26) by means of the second layer (74) and the windings ( 36) are formed by means of the first layer (72) and the third layer (76).

16. A method (84) for producing an antenna (18) according to any one of claims 13 to 15, wherein

a sheet-like sheet or piece goods (88) is provided,

- The film structure (62) from the sheet or by the meter (88) is separated out, and

- The first screen (38) with respect to the longitudinal direction (34) of the spool core (26) is angled.

7. hearing aid (4), in particular hearing aid device, with an antenna (18) according to one of claims 1 to 15.