• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an electromagnetic signal converter for a bone conduction receiver, comprising - a soft magnetic yoke (1), - an electrical coil (2) arranged concentrically to the longitudinal axis of the yoke (1), - an elastically suspended soft magnetic armature (4), in the direction the longitudinal axis (5) of the yoke (1), by a working air gap (8) separated from the yoke (1) and along the longitudinal axis (5) of the yoke (1) is movable, and - a permanent magnet (9) in the direction the longitudinal axis (5) of the yoke (1) is magnetized to produce a magnetic bias of the yoke (1) and the armature (4). In order to reduce the excitation power for the coil, it is provided that the permanent magnet (9) and coil (2) do not overlap one another in the direction of the longitudinal axis of the yoke (1) and means are provided for generating the magnetic flux that can be generated by the coil (2) split into at least two flow paths, wherein a flux path outside the permanent magnet (9), whereby the total of the coil (2) seen total magnetic circuit of the magnetic circuit is minimized.
    公开号:AT516871A1
    申请号:T50175/2015
    申请日:2015-03-05
    公开日:2016-09-15
    发明作者:
    申请人:Bhm-Tech Produktionsgesellschaft M B H；
    IPC主号:
    专利说明:

    Electromagnetic transducer for a bone conduction listener
    FIELD OF THE INVENTION
    The invention relates to an electromagnetic transducer for a bone conduction listener (osteophone), comprising - a soft magnetic yoke, - an electrical coil arranged concentrically to the longitudinal axis of the yoke, - an elastically suspended soft magnetic anchor, seen in the direction of the longitudinal axis of the yoke by a
    Working air gap is separated from the yoke and movable along the longitudinal axis of the yoke, and - a permanent magnet which is magnetized in the direction of the longitudinal axis of the yoke to produce a magnetic bias of the yoke and the armature.
    The magnetic bias causes during operation of the electromagnetic signal converter, a current-proportional, taking place through the coil force generation on the armature and thus an accurate transmission of electrical to mechanical vibrations. Without this magnetic bias, the force, and thus mechanical deflection, would be proportional to the square of the current, which would result in significant distortion by frequency doubling and suppression of the weak signals.
    STATE OF THE ART
    Bone conduction earphones, as known from the prior art, convert electrical signals into mechanical vibrations and therefore function as vibration generators or electromagnetic signal transducers. This technology is used among other things in hearing aids and is particularly suitable for people with impairment of the outer and middle ear, since in this case the sound can not be transferred mechanically to the cochlea. However, bone conduction hearing aids can also be used in other hearing and communication systems where sound transmission via the air to the eardrum is not possible, for example under water. For example, bone conduction earphones can be used for communication systems for divers. Also, where sound transmission over the air is basically possible, but due to ambient noise, the transmitted sound would be barely audible, as in heavy industry (e.g., steel mills), bone conduction earphones can be used in communication systems.
    The acoustic signal to be transmitted to humans is usually recorded via a microphone (but it could also be transmitted as a radio signal), converted in the amplifier, processed and forwarded as an electrical signal to the electromagnetic signal converter. In the signal converter, the electrical signals are fed to the coil, which causes the armature to vibrate accordingly. The oscillator (bone conduction tube) serving as an anchor contacts the cranial bone, preferably the mastoid, whereby the acoustic signal is transmitted in the form of tactile oscillations, bypassing the middle ear, directly into the inner ear, where it is converted into a nerve stimulus in the cochlea.
    These bone conduction headphones are usually installed in a carrier object, for example in a temples, a hairband or in an external housing for wearing in a headgear.
    A disadvantage of the conventional structure of the signal converter is that the permanent magnet is constructed as a ring magnet, that has the shape of a hollow cylinder which surrounds an annular coil and at one
    End face a disc-shaped part of the yoke, the yoke plate, contacted, while it faces the anchor on the other end while maintaining an air gap, a so-called working air gap. This has the disadvantage that both the magnetic flux excited by the magnetic flux of the permanent magnet and that through the coil use the same flux paths, namely longitudinally through the yoke, in particular through a rod-shaped part of the yoke (yoke core), radially through the armature in the ring magnets, in the longitudinal direction through the ring magnet and back into the yoke, in particular radially through the yoke plate back into the yoke core. This means that the coil flux must overcome the high magnetic resistance of the ring magnet. Thus, to generate a certain magnetic flux change through the coil a high electrically excited flooding (large ampere turns) is required. This is synonymous with high current or high number of turns, in any case, a high excitation power for the coil is needed, which again has a low life of the battery of the bone conduction tube result.
    OBJECT OF THE INVENTION
    Therefore, it is an object of the present invention to overcome the disadvantages of the prior art and to provide an electromagnetic signal converter which requires less excitation power for the coil.
    PRESENTATION OF THE INVENTION
    This object is achieved by an electromagnetic signal converter according to claim 1. Starting from an electromagnetic transducer for a bone conduction receiver comprising - a soft magnetic yoke, - an electrical coil arranged concentrically to the longitudinal axis of the yoke, - an elastically suspended soft magnetic armature, seen in the direction of the longitudinal axis of the yoke, by a
    Working air gap is separated from the yoke and movable along the longitudinal axis of the yoke, and - a permanent magnet, which is magnetized in the direction of the longitudinal axis of the yoke to produce a magnetic bias of the yoke and the armature, is provided that the permanent magnet and coil in the direction of each other do not overlap the longitudinal axis of the yoke and means are provided for dividing the magnetic flux producible by the coil into at least two flux paths, wherein a flux path extends outside the permanent magnet. By this means, of course, the magnetic flux of the permanent magnet is divided into at least two flow paths.
    This means that there is a parallel connection of the magnetic resistance of the permanent magnet and another magnetic resistance, so that the magnetic resistance of the permanent magnet - compared to the prior art with each other in the longitudinal direction overlapping concentric coil and permanent magnet - is reduced. The total magnetic resistance of the magnetic circuit seen by the coil is thereby minimized. As a result, a lower excitation power of the coil is sufficient for the same deflection of the armature. Consequently, the battery life is extended compared to conventional signal converters. The use of a flat, plate-shaped permanent magnet can also contribute to the reduction of the total magnetic resistance, as will be explained.
    The magnetic flux that can be generated by the coil can most easily be steered through the yoke to a flow path outside the permanent magnet. In other words, the yoke is the means for dividing the magnetic flux that can be generated by the coil into at least two flow paths. The already existing yoke can therefore be carried out according to the purpose of the invention.
    In one embodiment, it is provided that the yoke comprises a rod-shaped yoke core aligned along the longitudinal axis of the yoke and a yoke plate arranged normal to the longitudinal axis, the yoke core projecting into the coil and the yoke plate facing an end face of the coil and the coil producible by the coil magnetic flux is steerable through the yoke plate to a flux path outside the permanent magnet. The yoke plate does not necessarily have to be plate-shaped in the sense of a prism (body of the same thickness with mutually parallel end faces), but in principle may also have other, non-prismatic shapes, such as the shape of a truncated cone or cone. Depending on the geometry of the transducer, the yoke plate can be seen in the direction of the longitudinal axis of the yoke, e.g. circular, in particular a circular disk, or rectangular, in particular a rectangular plate. The dimension of the yoke plate normal to the longitudinal axis of the yoke is usually greater than the dimension of the yoke plate in the direction of the longitudinal axis of the yoke.
    By an arrangement of the permanent magnet on that side of the yoke, which - seen in the direction of the longitudinal axis of the yoke - the armature is opposite, is a part of the yoke, namely the yoke plate, between the coil and the permanent magnet and thus serves as a scattering grating for the magnetic fields of Coil and the permanent magnet. A part of the magnetic field lines, which penetrate from the permanent magnet in the yoke plate, run back into the permanent magnet and not through the entire yoke. For the magnetic flux of the coil resulting from the parallel circuit of permanent magnet resistance and Streustegwiderstand a lower magnetic
    Total resistance, which is sufficient for the same deflection of the armature lower excitation power of the coil.
    The magnetic resistance is defined by the consideration of the signal converter as a magnetic circuit. A magnetic circuit is a closed path of a magnetic flux. The laws of magnetic flux are defined analogously to the laws in the electrical circuit. The magnetic flux Φ is analogous to the electric current I, the magnetic resistance (the reluctance Rm) analogous to the electrical resistance (to the resistance R), and the magnetic voltage Vm analogous to the electrical voltage U considered. Analogously to the electrical resistance, the magnetic resistance Rm in the magnetic circuit can be defined as the quotient of the magnetic voltage Vm and the magnetic flux Φ.
    Permanent magnet, yoke and coil may be surrounded by a soft magnetic housing in the signal converter according to the invention, which is separated by an air gap from the armature and the yoke, so that the magnetic flux can be generated by the coil through the soft magnetic housing on a flow path outside the permanent magnet is steerable. Between one, the
    Permanent magnet facing end face of the yoke, in particular the yoke plate, and the housing may be an air gap.
    If the permanent magnet is plate-shaped, its extension in the direction of the longitudinal axis of the yoke is small compared to its extension normal to the longitudinal axis, the magnetic resistance of the permanent magnet in the direction of the longitudinal axis is also small, since the magnetic resistance is proportional to the thickness hM of the plate-shaped Permanent magnet and inversely proportional to the surface AM of the permanent magnet is: Rm = hM / (μ0 * μρ * ΑΜ).
    The plate-shaped permanent magnet can be designed to be a rare earth magnet, thus saving space and resistance (Rm = hM / (μ0 * μΡ * ΑΜ).) Under the name of rare earth magnets, a group of permanent magnets consisting essentially of ferrous metals (iron, cobalt) is summarized. and rare-earth metals (especially neodymium, samarium, praseodymium, dysprosium, terbium) are characterized by having high magnetic remanence flux density Br and high magnetic coercive force Hcj and thus high magnetic energy density (BH) max consist for example of neodymium-iron-boron (Nd2Fel4B) or samarium-cobalt (SmCo5 and Sm2Coi7) .The magnetic energy density of rare earth magnets is usually many times higher than that of steel magnets, eg made of AlNiCo a conventional ring magnet - reduced dimensions of the rare earth magnet also the weight of the permanent magnet and thus the signal converter.
    The permanent magnet will usually be formed for symmetry reasons as a circular disk, wherein the center of the circular disc is located on the longitudinal axis of the yoke.
    It is particularly favorable if the permanent magnet has a diameter which is smaller than the outer diameter of the coil but larger than the inner diameter of the coil. The permanent magnet could also be the same size or larger than the outer diameter of the coil. Decisive for the dimensioning of the permanent magnet is the required magnetic flux and thus essentially the magnetic surface AM.
    It can be provided that the largest diameter of the yoke, in particular the yoke plate, has the same outer diameter as the coil.
    The signal converter may be constructed so that an air gap, the so-called stray gap, between a peripheral surface of the yoke, in particular a peripheral surface of the yoke plate, and the housing is present. This air gap thus has, for example, the shape of a cylinder jacket. The air gap between the yoke plate and the housing causes a force generation according to F = Β2 * Α / 2μ0.
    It can be provided that the yoke, in particular the yoke plate, has a recess in the end face, which faces the permanent magnet, so that the permanent magnet is at least partially received in the yoke. This causes a positional fixation of the permanent magnet and the yoke.
    Analog and with the same effect can be provided that the soft magnetic housing has a recess which faces the permanent magnet, so that the permanent magnet is at least partially received in the housing.
    An embodiment of the invention is that the permanent magnet with its end faces with both the yoke, in particular the yoke plate, as well as with the housing in contact. In this way, an additional air gap is avoided. This requires good magnetization of the yoke plate and the housing, the magnetic field lines are mainly in this area.
    BRIEF DESCRIPTION OF THE FIGURES
    The invention will now be explained in more detail with reference to exemplary embodiments. The drawings are exemplary and are intended to illustrate the inventive idea, but in no way restrict it or even reproduce it.
    Showing:
    1 shows a longitudinal section through a schematically illustrated signal converter according to the prior art,
    2 shows a longitudinal section through a schematically illustrated signal converter according to the invention,
    3 shows the longitudinal section from FIG. 1 with magnetic field lines, FIG.
    4 shows the longitudinal section from FIG. 2 with magnetic field lines, FIG.
    5 shows a longitudinal section through an alternative signal converter according to the invention,
    Fig. 6 longitudinal sections of Fig. 5 with different magnetic field lines due to different coil excitation.
    WAYS FOR CARRYING OUT THE INVENTION
    Fig. 1 shows a conventional signal converter. It consists essentially of a yoke 1, a coil 2, a ring magnet 3 and a plate-shaped armature 4. A housing enclosing all the above-mentioned parts of the signal converter and protects against environmental influences is not shown here.
    The yoke 1 is, as well as the coil 2, the ring magnet 3 and the armature 4, rotationally symmetrical about the longitudinal axis 5 is formed. It is made in one piece, but has along the longitudinal axis 5 areas of different diameters, a rod-shaped part, ie a middle leg or yoke core 6 with a smaller diameter, and a disk-shaped part, ie a yoke plate 7 with a larger diameter. The yoke core 6 is usually longer than the yoke plate 7. The length of the yoke core 6 is dimensioned so that it completely penetrates the coil 2, which is placed concentrically to the yoke 1 on this. The yoke plate 7 is usually sized so that it has at least the same or a larger diameter than the coil 2. The yoke 1 may e.g. be made of magnetic stainless steel or mu-metal.
    In Fig. 1, the diameter of the yoke plate 7 is as large as that of the ring magnet 3. The ring magnet 3 is arranged concentrically to the yoke 1 and here - measured in the direction of the longitudinal axis 5 - higher than the coil 2. The ring magnet 3 is parallel to the longitudinal axis 5 magnetizes and is eg designed as AlNiCo magnet. The ring magnet 3 is seated with an end face on that end face of the yoke plate 7, which faces the yoke core 6. With its other end face, the ring magnet 3 extends down to a working air gap 8 for the armature 4 against the armature 4. Also, the yoke core 6 extends with its end face except for a working air gap 8 for the armature 4 to the anchor 4 zoom.
    The armature 4 can be made of the same material as the yoke 1. The armature 4 is elastically suspended - such as on the enclosure of the signal converter, not shown here - resiliently, so that it can move freely relative to the yoke 1 and the ring magnet 3, and although along the longitudinal axis. 5
    In Fig. 1 is - in the consideration of the signal converter as a magnetic circuit - a series circuit of the magnetic resistances of working air gap 8, yoke 6, yoke plate 7, ring magnet 3, working air gap 8 and anchor 4 before. Both magnetic fluxes (electrically excited by coil 2 and permanently excited by ring magnet 3) use this path. Here is the magnetic
    Resistance of the AlNiCo magnet because of its large magnetic height (in the direction of the longitudinal axis 5) and the relatively small area (normal to the longitudinal axis 5) very large and determining the arrangement.
    FIG. 2 shows a signal converter according to the invention. It consists essentially of a yoke 1, a coil 2, and a plate-shaped armature 4 and - in contrast to FIG. 1 - a plate-shaped, here circular disc-shaped, permanent magnet 9 and a housing (or pot) 10, here consisting of shell 12th and base plate (floor) 11. A housing, which encloses all the above-mentioned parts of the signal converter and protects against environmental influences is not shown here.
    The yoke 1 is, as well as the coil 2, the permanent magnet 9, the armature 4, and the housing 10, rotationally symmetrical about the longitudinal axis 5 of the yoke 1 is formed. The yoke 1 is made in one piece, but along the longitudinal axis 5 again has areas with different diameters, a yoke core 6 with a smaller diameter and a yoke plate 7 with a larger diameter. Both parts 6, 7 have here a cylindrical shape. The yoke core 6 is usually longer than the yoke plate 7. The length of the yoke core 6 is dimensioned so that it completely penetrates the coil 2, which is placed concentrically to the yoke 1 on this. Here, the yoke core 6 has approximately the same length or height as the coil 2. The yoke plate 7 is usually sized so that it has at least the same - as here - or a larger diameter than the coil 2. The yoke 1 can eg again be made of magnetic stainless steel or mu-metal. The armature 4 may be made of the same material as the yoke. 1
    The armature 4 is, e.g. on a spring, mechanically suspended.
    Due to the magnetic bias of the soft magnetic circuit consisting of yoke 1, armature 4 and housing 10 by means of permanent magnets 9, the armature 4 is attracted by the yoke 1 and the housing 10 and the resting working air gap 8 is established. The coil 2 is energized and, depending on the polarity of the current, the magnetic flux of the permanent magnet 9 is amplified or reduced. As a result, the magnetic force on the armature 4 changes and this moves in proportion to the change in current.
    The movement of the armature 4 is - transferred via a Umhausung - on the skull bone.
    The diameter of the permanent magnet 9 is smaller than that of the yoke plate 7. It is only about two thirds of the diameter of the disc-shaped part 7. The permanent magnet 9 is arranged concentrically to the yoke 1 and here - measured in the direction of the longitudinal axis 5 - thinner than the coil 2 or the yoke plate 7. The permanent magnet 9 is a rare earth magnet and magnetized parallel to the longitudinal axis 5. The permanent magnet 9 contacts with an end face the yoke plate 7 at its end face, which faces away from the yoke core 6. With its other end face, the permanent magnet 9 contacts the housing 10, namely its base plate 11.
    The housing 10 is cup-shaped and here has a flat base plate 11 and a cylindrical shell 12. The housing 10 is manufactured here in one piece. It may be made of the same soft magnetic material as the yoke 1 or the plate-shaped anchor. 4
    The housing 10 encloses together with the armature 4, the yoke 1, the coil 2 and the permanent magnet 9. Between the end face of the cylindrical shell 12 of the housing 10 and the armature 4, a working air gap 8 is provided. The armature 4 is suspended elastically on a housing, not shown, of the signal converter so that it can oscillate in the direction of the longitudinal axis 5 in accordance with the variable magnetic field predetermined by the coil 2. Likewise, the yoke core 6 extends with his
    End face except for a working air gap 8 for the anchor 4 to the anchor 4 zoom.
    The base plate 11 of the housing 10 has on its inside a circular disk-shaped recess into which the permanent magnet 9 is inserted. The depth of the recess-measured along the longitudinal axis 5-corresponds here to about one quarter of the thickness of the permanent magnet 9, so that it protrudes about halfway from the recesses. Likewise, the yoke plate 7 has a circular disk-shaped recess in the end face, which faces the permanent magnet 9 and in which the permanent magnet 9 is inserted. The depth of the recess - measured along the longitudinal axis 5 - also corresponds here about one quarter of the thickness of the permanent magnet. 9
    There is provided a radial distance of the permanent magnet 9 to the wall of each recess. This distance is used for easy centering of permanent magnet 9 and especially of the air gap (scattering gap) 14. The recess in the yoke plate 7 is the same size here as in the base plate eleventh
    Between the permanent magnet 9 facing, the end face of the yoke plate 7 and the base plate 11 of the housing 10 is an air gap 13, which is annular here. Its radial width - measured normal to the longitudinal axis 5 - is here about one third of the radius of the yoke plate 7, its axial height - measured in the direction of the longitudinal axis 5 - is here smaller than the height of the permanent magnet 9. In other embodiments of the invention, the air gap 13, of course, have other relative radial widths and axial heights. Between the peripheral surface of the yoke plate 7 and the shell 12 of the housing 10 is another air gap 14. Its axial height - measured in the direction of the longitudinal axis 5 - corresponds to the height of the yoke plate. 7
    The two air gaps 13, 14 merge into each other, so that a continuous, angled air gap between the peripheral surface of the permanent magnet 9 and the armature 4 is formed.
    The air gaps 13, 14 are associated with the
    Permanent magnet 9 is designed so that a sufficiently high magnetic bias is generated by the permanent magnet 9 and for the electrically excited flux of the coil 2, the magnetic resistances are kept as small as possible. This applies in particular to the parallel connection of the magnetic resistances of permanent magnet 9, air gap 13 and air gap 14. The working air gap 8 is predetermined by its function as an armature movement space. In soft magnetic material should usually no large magnetic resistances (magnetic voltage drops) arise. The design of the signal converter, in particular the air gaps 13, 14, of the permanent magnet 9, but also the shape and dimensions of the yoke plate 7, can be done again by calculating the above-mentioned magnetic circuit, where the individual components (magnetic conductor, magnetic resistors, magnetic coupling element ) are interconnected in accordance with each other.
    The resulting from the signal converter according to the invention different course of the magnetic field lines can be seen by comparing Figs. 3 and 4. In this case, both the field lines 15 of the respective permanent magnet, ie the ring magnet 3 from FIG. 1 and the disc-shaped permanent magnet 9 from FIG. 2, as well as the field lines 16 of the coil 2 are shown.
    In Fig. 3 the field lines of the signal converter of Fig. 1 are shown. Both caused by the ring magnet 3 field lines 15 as well as caused by the coil 2 field lines 16 are located throughout in the same areas. Namely, they run in the direction of the longitudinal axis 5 through the yoke core 6, radially through the armature 4 in the ring magnet 3, in the direction of the longitudinal axis 5 through the ring magnet 3 and radially through the yoke plate 7 back into the yoke core 6. This means that the Coil flow must overcome the high magnetic resistance of the ring magnet 3.
    FIG. 4 shows the field lines of the signal converter from FIG. 2. Although here also caused by the permanent magnet 9 field lines 15 extend partially through the same areas as caused by the coil 2 field lines 16. They run namely in the direction of the longitudinal axis 5 through the yoke core 6, radially through the armature 4 in the shell 12th of the housing 10, in the direction of the longitudinal axis 5 through the jacket 12 and radially through the base plate 11 of the housing 10 again in the longitudinal direction through the permanent magnet 9 in the yoke core. 6
    However, the magnetic fields are guided by the arrangement of the yoke plate 7 between the permanent magnet 9 and the coil 2 corresponding to the soft magnetic and divided in dependence of the magnetic resistances, which are mainly determined by the air gaps 13, 14 and the permanent magnet 9. In this way, field lines 15 of the permanent magnet 9, which extend only in the region of the permanent magnet 9, the yoke plate 7, the base plate 11 of the housing 10 and the cylindrical shell 12 of the housing 10, but not in the direction of the longitudinal axis 5 over the height the yoke plate 7 addition. Therefore, these field lines 15 do not penetrate into the coil 2, while other field lines 15 do so very well, only there are so few that they are not shown here.
    Likewise, a part of the field lines 16 of the coil 2 changes its course: they do not reach the base plate 11 of the housing 10, but run through the yoke plate 7, and thus the
    Permanent magnet 9 evasive to close through the jacket 12 of the housing 10 and through the yoke 6 of the back in the anchor 4. Thus, some field lines 16 run from the armature 4 axially through the yoke core 6 in the direction of permanent magnet 9, before the permanent magnet 9 radially through the yoke plate 7, then axially over the first air gap 13 to the base plate 11 of the housing 10 and radially outwardly beyond the base plate 11 in the Coat 12 and back into the anchor 4.
    A part of the magnetic field lines 16 of the magnetic field generated by the coil 2 between the yoke 1 and the housing 10 thus extends through the yoke plate 7 and not through the permanent magnet. 9
    Fig. 5 shows a longitudinal section through an alternative signal converter according to the invention, wherein only one half of the signal converter is shown schematically. The signal converter in Fig. 5 is basically the same as in Fig. 2, differs from Fig. 2 but in that coil 2 and permanent magnet 9 have the same outer diameter, but which is smaller than the outer diameter of the yoke plate 7. Thus arise also other dimensions in the air gaps 13, 14th
    In addition, in Fig. 5, the height of the coil 2 is smaller than the height of the yoke core. 6
    In Fig. 6, the longitudinal sections of Fig. 5 is shown three times, in addition, the magnetic field lines are plotted at different electrical flooding. On the left, the magnetic field is shown without energizing the coil 2, in the middle with energization of the coil 2 ("100 A") in the sense of a gain of
    Magnetic field of the permanent magnet 9, right with energization of the coil 2 ("- 100 A"), but in the sense of a compensation of the
    Magnetic field of the permanent magnet 9. It is in the left
    Figure clearly recognizable that the density of the magnetic field lines within the coil 2 is low.
    The subject signal converter is used in hearing and communication systems and for audio diagnostics, the associated bone conduction (osteophone) is worn and applied to the human or animal skull. According to the use of the size of the bone conduction tube and thus the signal converter is to be dimensioned. For some
    Embodiments of the subject signal converter this is very small, then its height from the base plate 11 of the housing 10 to the armature along the longitudinal axis 5 is about 2-10 mm, the diameter of the housing 10 and the approximately equal anchor 4 5-20 mm , The disc-shaped permanent magnet has, for example, a thickness of 0.5-0.7 mm, but the thickness can also be less than 0.5 mm or greater than 0.7 mm. In other embodiments, the diameter of the housing 10 may also be in the range of a few centimeters, for example up to 6 or 7 cm, or even up to 10 cm. Even larger signal transducers, for example for animals larger than humans, are conceivable.
    Another embodiment of a signal converter according to the invention would be the rectangular design, where permanent magnet 9, yoke plate 7 and coil 2 seen in the direction of the longitudinal axis 5 have a substantially rectangular shape.
    The invention, see in particular Figs. 2 and 5, divides the magnetic fluxes and provides for a small magnetic resistance of the permanent magnet 9 by small height and large area, which can best be realized by SE magnets. In addition, the flow paths of the air gap 14 (stray gap) and the air gap 13, which are connected in parallel from the point of view of electrical excitation, ensure a further significant reduction in the magnetic field in addition to the permanent magnet 9
    Total resistance. Although magnetic flux of the permanent magnetic excitation for magnetic bias is removed from the working air gap 8 by these "scattering paths", the magnetic surface is also larger in comparison to that in Fig. 1 in order to compensate for this Make sure that the scattering groove, ie the yoke plate 7, is not saturated in its outer area, where both magnetic fluxes add up.
    REFERENCE LIST 1 yoke 2 electrical coil 3 ring magnet 4 armature 5 longitudinal axis 6 yoke core of yoke 1 7 yoke plate of yoke 1 8 working air gap 9 permanent magnet 10 housing 11 base plate of casing 10 12 cylindrical casing of casing 10 13 air gap (stray gap between yoke plate 6 and base plate 11) 14 air gap (scattering gap between the yoke plate 6 and shell 12) 15 field line of the permanent magnet 9 or of the ring magnet 3 16 field line of the coil 2
    权利要求:
    Claims (14)
    [1]
    1. An electromagnetic transducer for a bone conduction receiver, comprising - a soft magnetic yoke (1), - a concentric with the longitudinal axis of the yoke (1) arranged electrical coil (2), - an elastically suspended soft magnetic armature (4), in the direction of the longitudinal axis (5) of the yoke (1) separated by a working air gap (8) from the yoke (1) and movable along the longitudinal axis (5) of the yoke (1), and - a permanent magnet (9) pointing in the direction of the longitudinal axis (5) of the yoke (1) is magnetized to produce a magnetic bias of the yoke (1) and the armature (4), characterized in that the permanent magnet (9) and coil (2) in the direction of the longitudinal axis of the yoke ( 1) and means are provided for dividing the magnetic flux producible by the coil (2) into at least two flux paths, a flux path extending outside the permanent magnet (9).
    [2]
    2. Signal converter according to claim 1, characterized in that the coil (2) can be generated by the magnetic flux through the yoke (1) on a flow path outside the permanent magnet (9) is steerable.
    [3]
    3. Signal converter according to claim 1 or 2, characterized in that the yoke (1) comprises a along the longitudinal axis (5) of the yoke aligned rod-shaped yoke core (6) and a normal to the longitudinal axis arranged yoke plate (7), wherein the yoke core (6 ) projects into the coil (2) and the yoke plate (7) faces an end face of the coil (2), and the magnetic flux which can be generated by the coil (2) passes through the yoke plate (7) to a flux path outside the permanent magnet (9). is steerable.
    [4]
    4. Signal converter according to one of claims 1 to 3, characterized in that the permanent magnet (9) with respect to the yoke (1) the armature (4) is arranged opposite.
    [5]
    5. Signal converter according to one of claims 1 to 4, characterized in that permanent magnet (9), yoke (1) and coil (2) by a soft magnetic housing (10) are surrounded by an air gap (13, 14) from the armature (4) and separated from the yoke (1) so that the magnetic flux producible by the coil (2) can be directed through the soft magnetic housing (10) to a flux path outside the permanent magnet (9).
    [6]
    6. Signal converter according to one of claims 1 to 5, characterized in that the permanent magnet (9) is plate-shaped.
    [7]
    7. Signal converter according to one of claims 1 to 6, characterized in that the permanent magnet (9) is a rare earth magnet.
    [8]
    8. Signal converter according to one of claims 1 to 7, characterized in that the permanent magnet (9) is designed as a circular disk, wherein the center of the circular disk on the longitudinal axis (5) of the yoke (1).
    [9]
    9. Signal converter according to one of claims 1 to 8, characterized in that the permanent magnet (9) has a diameter which is smaller than the outer diameter of the coil (2), but larger than the inner diameter of the coil (2).
    [10]
    10. Signal converter according to one of claims 1 to 9, characterized in that the largest diameter of the yoke (1), in particular the yoke plate (7), the same outer diameter as the coil (2).
    [11]
    11. Signal converter according to one of claims 6 to 10, characterized in that an air gap between a peripheral surface of the yoke (1), in particular a peripheral surface of the yoke plate (7), and the housing (10) is present.
    [12]
    12. Signal converter according to one of claims 1 to 11, characterized in that the yoke (1), in particular the yoke plate (7), has a recess in the end face, which faces the permanent magnet (9), so that the permanent magnet (9) at least partially absorbed in the yoke.
    [13]
    13. Signal converter according to one of claims 1 to 12, characterized in that the soft magnetic housing (10) has a recess which faces the permanent magnet (9), so that the permanent magnet (9) is at least partially accommodated in the housing (10).
    [14]
    14. Signal converter according to one of claims 1 to 13, characterized in that the permanent magnet (9) with its end faces both with the yoke (1), in particular the yoke plate (7), as well as with the housing (10) is in contact.
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    同族专利:
    公开号 | 公开日
    US9699566B2|2017-07-04|
    DK3065420T3|2020-09-21|
    EP3065420A1|2016-09-07|
    AT516871B1|2018-03-15|
    CN106060724A|2016-10-26|
    EP3065420B1|2020-06-24|
    CN106060724B|2020-03-13|
    US20160261958A1|2016-09-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2011163115A1|2010-06-21|2011-12-29|Vibrant Med-El Hearing Technology Gmbh|Electromagnetic bone conduction hearing device|
    US20140012069A1|2012-07-09|2014-01-09|Vibrant Med-El Hearing Technology Gmbh|Electromagnetic Bone Conduction Hearing Device|
    CN203840522U|2014-03-24|2014-09-17|项泽玉|Mute bone conduction electromagnetic vibration transducer|
    SE447948B|1985-05-15|1986-12-22|Bo Hakansson|Vibrator for hearing aid|
    SE516270C2|2000-03-09|2001-12-10|Osseofon Ab|Electromagnetic vibrator|
    SE0002073L|2000-06-02|2001-05-21|P & B Res Ab|Vibrator for leg anchored and leg conduit hearing aids|
    SE523125C2|2001-06-21|2004-03-30|P & B Res Ab|Vibrator for vibration generation in bone anchored hearing aids|
    KR200401424Y1|2005-09-08|2005-11-15|이동원|Bone conductive speaker|
    WO2010025351A2|2008-08-29|2010-03-04|The Peen State Research Foundation|Methods and apparatus for reduced distortion balanced armature devices|
    IT1399082B1|2010-03-25|2013-04-05|Claudio Lastrucci|MOBILE MAGNETIC ELECTRO-MECHANICAL CONVERSION SYSTEM; ACOUSTIC DIFFUSER INCLUDING THIS SYSTEM AND A MOBILE ORGAN GENERATING ACOUSTIC WAVES.|US10290463B2|2017-04-27|2019-05-14|Imatrex, Inc.|Compact deflecting magnet|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50175/2015A|AT516871B1|2015-03-05|2015-03-05|Electromagnetic transducer for a bone conduction listener|ATA50175/2015A| AT516871B1|2015-03-05|2015-03-05|Electromagnetic transducer for a bone conduction listener|
    US15/052,256| US9699566B2|2015-03-05|2016-02-24|Electromagnetic signal converter for an osteophone|
    CN201610344896.4A| CN106060724B|2015-03-05|2016-03-04|Electromagnetic signal converter for bone conduction earphone|
    EP16158871.0A| EP3065420B1|2015-03-05|2016-03-07|Electromagnetic signal converter for a bone conduit earpiece|
    DK16158871.0T| DK3065420T3|2015-03-05|2016-03-07|Electromagnetic transducer for a bone conducting headset|
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