EP3065420A1 - Electromagnetic signal converter for a bone conduit earpiece - Google Patents

Electromagnetic signal converter for a bone conduit earpiece Download PDF

Info

Publication number
EP3065420A1
EP3065420A1 EP16158871.0A EP16158871A EP3065420A1 EP 3065420 A1 EP3065420 A1 EP 3065420A1 EP 16158871 A EP16158871 A EP 16158871A EP 3065420 A1 EP3065420 A1 EP 3065420A1
Authority
EP
European Patent Office
Prior art keywords
yoke
permanent magnet
coil
signal converter
longitudinal axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16158871.0A
Other languages
German (de)
French (fr)
Other versions
EP3065420B1 (en
Inventor
Franz Berl
Frank Jurisch
Klaus Hostniker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BHM-Tech Produktionsgesellschaft mbH
Original Assignee
BHM-Tech Produktionsgesellschaft mbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BHM-Tech Produktionsgesellschaft mbH filed Critical BHM-Tech Produktionsgesellschaft mbH
Publication of EP3065420A1 publication Critical patent/EP3065420A1/en
Application granted granted Critical
Publication of EP3065420B1 publication Critical patent/EP3065420B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/02—Loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/13—Hearing devices using bone conduction transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/604—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers
    • H04R25/606—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers acting directly on the eardrum, the ossicles or the skull, e.g. mastoid, tooth, maxillary or mandibular bone, or mechanically stimulating the cochlea, e.g. at the oval window

Definitions

  • 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.
  • Bone conduction earphones convert electrical signals into mechanical vibrations and therefore function as vibration generators or electromagnetic signal transducers. This technology is under Another application 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 mechanically transmitted to the cochlea.
  • 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.
  • bone conduction earphones can be used for communication systems for divers. Even where a sound transmission via air is basically possible, but due to environmental noise of the transmitted sound would be barely audible, as in heavy industry (eg in steel works), bone conduction headphones 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 ⁇ 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.
  • the magnetic resistance Rm in the magnetic circuit can be defined as the quotient of the magnetic voltage Vm and the magnetic flux ⁇ .
  • 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.
  • An air gap may be present between an end face of the yoke facing the permanent magnet, in particular the yoke plate, and the housing.
  • R m h M / ( ⁇ o * ⁇ p * ⁇ M ).
  • rare-earth magnets a group of permanent magnets consisting essentially of ferrous metals is composed (Iron, cobalt) and rare-earth metals (especially neodymium, samarium, praseodymium, dysprosium, terbium) are characterized by the fact that they simultaneously have a high magnetic remanence flux density B r and a high magnetic coercive force H cJ and thus a high magnetic energy density ( BH) max have.
  • Common rare earth magnets are made (SmCo 5 and Sm 2 Co 17) as neodymium-iron-boron (Nd2Fe14B) or samarium-cobalt.
  • the magnetic energy density of rare earth magnet is usually higher than that of steel magnets, by a multiple, For example, consisting of AlNiCo.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • 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 with different diameters, a rod-shaped part, ie a center leg or yoke core 6 with smaller diameter, and a disc-shaped part, ie a yoke plate 7 of 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 be made of magnetic stainless steel or mu-metal, for example.
  • 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 magnetized parallel to the longitudinal axis 5 and is eg 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.
  • 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
  • Fig. 1 is - when viewing the signal converter as a magnetic circuit - a series connection 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.
  • 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 an inventive signal converter is shown. It consists essentially of a yoke 1, a coil 2, and a plate-shaped armature 4 and - in contrast to Fig. 1 - From a plate-shaped, here circular disc-shaped, permanent magnet 9 and a housing (or pot) 10, here consisting of jacket 12 and base plate (bottom) 11. A housing enclosing all the above parts of the transducer 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.
  • 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 mechanically suspended, for example on a spring.
  • 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 from the yoke 1 and the housing 10 tightened and the resting working air gap 8 is set.
  • 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.
  • 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.
  • 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 about one quarter of the thickness of the permanent magnet 9, so that this still protrudes about half of the recesses.
  • 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. It 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
  • 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 designed in connection with the permanent magnet 9 so that a sufficiently high magnetic bias voltage 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.
  • Fig. 3 are the field lines of the signal converter off Fig. 1 located. Both caused by the ring magnet 3 field lines 15 as well as caused by the coil 2 field lines 16 are continuously 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 are the field lines of the signal converter off Fig. 2 located.
  • 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 6th
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 built, different from Fig. 2 However, characterized 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, there are also other dimensions in the air gaps 13, 14.
  • the height of the coil 2 is less than the height of the yoke core. 6
  • Fig. 6 is the longitudinal cuts off Fig. 5 shown three times, in addition, the magnetic field lines are drawn at different electrical flooding.
  • the magnetic field without energization of the coil 2 is shown, in the middle with energization of the coil 2 ("100 A") in the sense of amplifying the magnetic field of the permanent magnet 9, right with energization of the coil 2 ("-100 A"), however in the sense of a compensation of the magnetic field of the permanent magnet 9.
  • 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. In 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 anchor of approximately equal size 5 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 Fig. 2 and 5 Shares the magnetic fluxes and provides a small magnetic resistance of the permanent magnet 9 by low height and large area, which can best be realized by SE magnets.
  • 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.
  • the magnetic surface is compared to that in Fig. 1 also larger to compensate for this.
  • the design of the signal converter according to the invention is also important to ensure that the scattering, so the yoke plate 7 is not saturated in its outer region, where both magnetic fluxes add up.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

Die Erfindung betrifft einen elektromagnetischen Signalwandler für einen Knochenleitungshörer, umfassend - ein weichmagnetisches Joch (1), - eine konzentrisch zur Längsachse des Jochs (1) angeordnete elektrische Spule (2), - einen elastisch aufgehängten weichmagnetischen Anker (4), der, in Richtung der Längsachse (5) des Jochs (1) gesehen, durch einen Arbeitsluftspalt (8) vom Joch (1) getrennt und entlang der Längsachse (5) des Jochs (1) beweglich ist, sowie - einen Permanentmagneten (9), der in Richtung der Längsachse (5) des Jochs (1) magnetisiert ist, um eine magnetische Vorspannung des Jochs (1) und des Ankers (4) zu erzeugen. Um die Erregerleistung für die Spule zu verringern, ist vorgesehen, dass Permanentmagnet (9) und Spule (2) einander in Richtung der Längsachse des Jochs (1) nicht überlappen und Mittel vorgesehen sind, um den durch die Spule (2) erzeugbaren magnetischen Fluss auf zumindest zwei Flusspfade aufzuteilen, wobei ein Flusspfad außerhalb des Permanentmagneten (9) verläuft, wodurch der von der Spule (2) gesehene magnetische Gesamtwiderstand des magnetischen Kreises minimiert wird.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), seen in the direction of the longitudinal axis (5) of the yoke (1), separated by a working air gap (8) from the yoke (1) and along the longitudinal axis (5) of the yoke (1) is mobile, as well - A permanent magnet (9) which is magnetized in the direction of the longitudinal axis (5) of the yoke (1) 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.

Description

Die Erfindung betrifft einen elektromagnetischen Signalwandler für einen Knochenleitungshörer (Osteophone), umfassend

  • ein weichmagnetisches Joch,
  • eine konzentrisch zur Längsachse des Jochs angeordnete elektrische Spule,
  • einen elastisch aufgehängten weichmagnetischen Anker, der, in Richtung der Längsachse des Jochs gesehen, durch einen Arbeitsluftspalt vom Joch getrennt und entlang der Längsachse des Jochs beweglich ist, sowie
  • einen Permanentmagneten, der in Richtung der Längsachse des Jochs magnetisiert ist, um eine magnetische Vorspannung des Jochs und des Ankers zu erzeugen.
The invention relates to an electromagnetic signal converter for a bone conduction listener (osteophone), comprising
  • a soft magnetic yoke,
  • a concentric with the longitudinal axis of the yoke arranged electrical coil,
  • an elastically suspended soft magnetic armature which, viewed in the direction of the longitudinal axis of the yoke, is separated from the yoke by a working air gap and movable along the longitudinal axis of the yoke, and
  • a permanent magnet magnetized in the direction of the longitudinal axis of the yoke to produce a magnetic bias of the yoke and the armature.

Die magnetische Vorspannung bewirkt im Betrieb des elektromagnetischen Signalwandlers eine stromproportionale, durch die Spule erfolgende Krafterzeugung auf den Anker und somit eine exakte Übertragung der elektrischen in mechanische Schwingungen. Ohne diese magnetische Vorspannung wäre die Kraft und somit mechanische Auslenkung proportional zum Quadrat des Stromes, was zu einer erheblichen Verzerrung durch die Frequenzverdopplung und Unterdrückung der schwachen Signale führen würde.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.

STAND DER TECHNIKSTATE OF THE ART

Knochenleitungshörer, wie sie aus dem Stand der Technik bekannt sind, wandeln elektrische Signale in mechanische Schwingungen um und fungieren daher als Schwingungserzeuger bzw. elektromagnetische Signalwandler. Diese Technologie findet unter anderem bei Hörgeräten Anwendung und eignet sich insbesondere für Personen mit Beeinträchtigung des Außen- und Mittelohres, da in diesem Fall der Schall nicht mechanisch zur Cochlea übertragen werden kann. Knochenleitungshörer können jedoch auch in anderen Hör- und Kommunikationssystemen eingesetzt werden, wo eine Schallübertragung über Luft zum Trommelfell nicht möglich ist, etwa unter Wasser. So können Knochenleitungshörer für Kommunikationssysteme für Taucher zur Anwendung kommen. Auch dort, wo eine Schallübertragung über Luft grundsätzlich möglich ist, aber aufgrund von Umgebungslärm der übertragene Schall kaum hörbar wäre, wie in der Schwerindustrie (z.B. in Stahlwerken), können Knochenleitungshörer in Kommunikationssystemen verwendet werden.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 under Another application 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 mechanically transmitted 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. Even where a sound transmission via air is basically possible, but due to environmental noise of the transmitted sound would be barely audible, as in heavy industry (eg in steel works), bone conduction headphones can be used in communication systems.

Das an den Menschen zu übertragenden akustische Signal wird in der Regel über ein Mikrofon aufgenommen (es könnte aber auch als Funksignal übertragen werden), im Verstärker umgewandelt, aufbereitet und als elektrisches Signal an den elektromagnetischen Signalwandler weitergeleitet. Im Signalwandler werden die elektrischen Signale der Spule zugeführt, welche den Anker entsprechend in Schwingung versetzt. Der als Anker dienende Oszillator (Knochenleitungshörer) kontaktiert den Schädelknochen, vorzugsweise das Mastoid, wobei das akustische Signal in Form von taktilen Schwingungen unter Umgehung des Mittelohres direkt ins Innenohr übertragen wird, wo es in der Cochlea in einen Nervenreiz umgewandelt wird.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.

Diese Knochenleitungshörer sind meist in einem Trägerobjekt verbaut, beispielsweise in einem Brillenbügel, einem Haarreifen oder in einem externen Gehäuse zum Tragen in einer Kopfbedeckung.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.

Nachteilig am herkömmlichen Aufbau des Signalwandlers ist, dass der Permanentmagnet als Ringmagnet aufgebaut ist, also die Form eines Hohlzylinders hat, der eine Ringspule umgibt und an einer Stirnseite einen scheibenförmigen Teil des Jochs, die Jochplatte, kontaktiert, während er auf der anderen Stirnseite dem Anker unter Einhaltung eines Luftspalts, eines sogenannten Arbeitsluftspalts, zugewandt ist. Dies hat den Nachteil, dass sowohl der durch den magnetische Fluss des Permanentmagneten als auch der durch die Spule erregte magnetische Fluss die gleichen Flusspfade nutzen, nämlich in Längsrichtung durch das Joch, insbesondere durch einen stabförmigen Teil des Jochs (Jochkern), radial durch den Anker in den Ringmagneten, in Längsrichtung durch den Ringmagneten und wieder in das Joch, insbesondere radial durch die Jochplatte wieder in den Jochkern. Das bedeutet, dass auch der Spulenfluss den hohen magnetischen Widerstand des Ringmagneten überwinden muss. Somit wird zur Erzeugung einer bestimmten magnetischen Flussänderung durch die Spule eine hohe elektrisch erregte Durchflutung (große Amperewindungen) benötigt. Dies ist gleichbedeutend mit hohem Strom oder hoher Windungsanzahl, auf jeden Fall wird eine hohe Erregerleistung für die Spule benötigt, was wieder eine geringe Lebensdauer der Batterie des Knochenleitungshörers zur Folge hat.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.

AUFGABE DER ERFINDUNGOBJECT OF THE INVENTION

Daher ist es eine Aufgabe der vorliegenden Erfindung, die Nachteile des Stands der Technik zu überwinden und einen elektromagnetischen Signalwandler zur Verfügung zu stellen, der weniger Erregerleistung für die Spule benötigt.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.

DARSTELLUNG DER ERFINDUNGPRESENTATION OF THE INVENTION

Diese Aufgabe wird durch einen elektromagnetischen Signalwandler gemäß Anspruch 1 gelöst. Ausgehend von einem elektromagnetischen Signalwandler für einen Knochenleitungshörer, umfassend

  • ein weichmagnetisches Joch,
  • eine konzentrisch zur Längsachse des Jochs angeordnete elektrische Spule,
  • einen elastisch aufgehängten weichmagnetischen Anker, der, in Richtung der Längsachse des Jochs gesehen, durch einen Arbeitsluftspalt vom Joch getrennt und entlang der Längsachse des Jochs beweglich ist, sowie
  • einen Permanentmagneten, der in Richtung der Längsachse des Jochs magnetisiert ist, um eine magnetische Vorspannung des Jochs und des Ankers zu erzeugen,
ist vorgesehen, dass Permanentmagnet und Spule einander in Richtung der Längsachse des Jochs nicht überlappen und Mittel vorgesehen sind, um den durch die Spule erzeugbaren magnetischen Fluss auf zumindest zwei Flusspfade aufzuteilen, wobei ein Flusspfad außerhalb des Permanentmagneten verläuft. Durch diese Mittel wird natürlich auch der magnetische Fluss des Permanentmagneten auf zumindest zwei Flusspfade aufgeteilt.This object is achieved by an electromagnetic signal converter according to claim 1. Starting from an electromagnetic transducer for a bone conduction listener, comprising
  • a soft magnetic yoke,
  • a concentric with the longitudinal axis of the yoke arranged electrical coil,
  • an elastically suspended soft magnetic armature which, viewed in the direction of the longitudinal axis of the yoke, is separated from the yoke by a working air gap and movable along the longitudinal axis of the yoke, and
  • a permanent magnet magnetized in the direction of the longitudinal axis of the yoke to produce a magnetic bias of the yoke and the armature,
it is provided that permanent magnet and coil do not overlap each other in the direction of the longitudinal axis of the yoke and means are provided to divide the magnetic flux, which can be generated 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.

Das bedeutet, dass es zu einer Parallelschaltung des magnetischen Widerstands des Permanentmagneten und eines weiteren magnetischen Widerstands kommt, sodass der magnetische Widerstand des Permanentmagneten - im Vergleich zum Stand der Technik mit einander in Längsrichtung überlappender konzentrischer Spule und Permanentmagnet - verringert wird. Der von der Spule gesehene magnetische Gesamtwiderstand des magnetischen Kreises wird dadurch minimiert. Dadurch ist für die gleiche Auslenkung des Ankers eine geringere Erregerleistung der Spule ausreichend. Folglich verlängert sich gegenüber herkömmlichen Signalwandlern auch die Batteriebetriebsdauer. Die Verwendung eines flachen, plattenförmigen Permanentmagneten kann ebenfalls zur Reduzierung des magnetischen Gesamtwiderstands beitragen, wie noch erläutert wird.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.

Der durch die Spule erzeugbare magnetische Fluss kann am einfachsten durch das Joch auf einen Flusspfad außerhalb des Permanentmagneten lenkbar sein. Mit anderen Worten ist das Joch das Mittel, um den durch die Spule erzeugbaren magnetischen Fluss auf zumindest zwei Flusspfade aufzuteilen. Das ohnehin vorhandene Joch kann also für den erfindungsgemäßen Zweck entsprechend ausgeführt werden.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.

Bei einer Ausführungsform ist vorgesehen, dass das Joch einen längs der Längsachse des Jochs ausgerichteten stabförmigen Jochkern und eine normal zur Längsachse angeordnete Jochplatte umfasst, wobei der Jochkern in die Spule ragt und die Jochplatte einer Stirnseite der Spule zugewandt ist, und der durch die Spule erzeugbare magnetische Fluss durch die Jochplatte auf einen Flusspfad außerhalb des Permanentmagneten lenkbar ist. Die Jochplatte muss dafür nicht zwingend plattenförmig im Sinne eines Prismas (Körper gleicher Dicke mit zueinander parallelen Stirnflächen) sein, sondern kann grundsätzlich auch andere, nicht prismatische Formen aufweisen, wie die Form eines Kegelstumpfs oder Kegels. Die Jochplatte kann, je nach Geometrie des Signalwandlers, in Richtung der Längsachse des Jochs gesehen z.B. kreisförmig, insbesondere eine Kreisscheibe, oder rechteckig, insbesondere eine rechteckige Platte sein. Die Abmessung der Jochplatte normal auf die Längsachse des Jochs ist in der Regel größer als die Abmessung der Jochplatte in Richtung der Längsachse des Jochs.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.

Durch eine Anordnung des Permanentmagneten auf jener Seite des Joches, die - in Richtung der Längsachse des Jochs gesehen - dem Anker gegenüber liegt, befindet sich ein Teil des Jochs, nämlich die Jochplatte, zwischen Spule und Permanentmagnet und dient somit als Streusteg für die Magnetfelder der Spule und des Permanentmagneten. Ein Teil der magnetischen Feldlinien, die aus dem Permanentmagneten in die Jochplatte eindringen, verlaufen wieder zurück in den Permanentmagneten und nicht durch das gesamte Joch. Für den magnetischen Fluss der Spule ergibt sich aus der Parallelschaltung von Permanentmagnetwiderstand und Streustegwiderstand ein niedrigerer magnetischer Gesamtwiderstand, wodurch für die gleiche Auslenkung des Ankers eine geringere Erregerleistung der Spule ausreicht.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 in the permanent magnets and not through the entire yoke. For the magnetic flux of the coil resulting from the parallel circuit of the permanent magnet resistor and Streustegwiderstand a lower total magnetic resistance, which is sufficient for the same deflection of the armature lower excitation power of the coil.

Der magnetische Widerstand ist durch die Betrachtung des Signalwandlers als magnetischer Kreis definiert. Ein magnetischer Kreis ist ein geschlossener Pfad eines magnetischen Flusses. Die Gesetze des magnetischen Flusses sind analog zu den Gesetzen im elektrischen Stromkreis definiert. Der magnetische Fluss Φ wird hierbei analog zum elektrischen Strom I, der magnetische Widerstand (die Reluktanz Rm) analog zum elektrischen Widerstand (zur Resistanz R), und die magnetische Spannung Vm analog zur elektrischen Spannung U betrachtet. In Analogie zum elektrischen Widerstand kann man im magnetischen Kreis den magnetischen Widerstand Rm als Quotienten aus der magnetische Spannung Vm und des magnetischen Flusses Φ definieren.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.

Permanentmagnet, Joch und Spule können beim erfindungsgemäßen Signalwandler von einem weichmagnetischen Gehäuse umgeben sein, das durch einen Luftspalt vom Anker und vom Joch getrennt ist, sodass der durch die Spule erzeugbare magnetische Fluss durch das weichmagnetische Gehäuse auf einen Flusspfad außerhalb des Permanentmagneten lenkbar ist. Zwischen einer, dem Permanentmagneten zugewandten Stirnfläche des Jochs, insbesondere der Jochplatte, und dem Gehäuse kann ein Luftspalt vorliegen.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. An air gap may be present between an end face of the yoke facing the permanent magnet, in particular the yoke plate, and the housing.

Wenn der Permanentmagnet plattenförmig ausgebildet ist, seine Ausdehnung in Richtung der Längsachse des Jochs also klein ist im Vergleich zu seiner Ausdehnung normal zur Längsachse, ist der magnetische Widerstand des Permanentmagneten in Richtung der Längsachse ebenfalls klein, da der magnetische Widerstand proportional zur Dicke hM des plattenförmigen Permanentmagneten und umgekehrt proportional zur Fläche AM des Permanentmagneten ist: Rm = hM/ (µo*µp*AM).If the permanent magnet is plate-shaped, its extension in the direction of the longitudinal axis of the yoke is thus 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 h M of the plate-shaped permanent magnet and inversely proportional to the surface AM of the permanent magnet is: Rm = h M / (μ o * μ p * A M ).

Der plattenförmige Permanentmagnet kann besonders dünn und damit platzsparend und widerstandsarm (Rm = hM /(µo*µp*µM) als Seltenerdmagnet ausgeführt sein. Unter dem Namen Seltenerdmagneten fasst man eine Gruppe von Permanentmagneten zusammen, die im Wesentlichen aus Eisenmetallen (Eisen, Kobalt) und Seltenerdmetallen (insbesondere Neodym, Samarium, Praseodym, Dysprosium, Terbium) bestehen. Sie zeichnen sich dadurch aus, dass sie gleichzeitig eine hohe magnetische Remanenzflussdichte Br und eine hohe magnetische Koerzitivfeldstärke HcJ und damit eine hohe magnetische Energiedichte (BH)max aufweisen. Gängige Seltenerdmagnete bestehen etwa aus Neodym-Eisen-Bor (Nd2Fe14B) oder Samarium-Kobalt (SmCo5 und Sm2Co17). Die magnetische Energiedichte von Seltenerdmagneten ist in der Regel um ein Vielfaches höher als jene von Stahlmagneten, z.B. bestehend aus AlNiCo. Durch die - im Vergleich zu einem herkömmlichen Ringmagneten - geringeren Dimensionen des Seltenerdmagneten verringert sich auch das Gewicht des Permanentmagneten und damit des Signalwandlers.The plate-shaped permanent magnet can be designed as a rare-earth magnet, thus saving space and resistance (R m = h M / (μ o * μ p * μ M ).) Under the name of rare-earth magnets, a group of permanent magnets consisting essentially of ferrous metals is composed (Iron, cobalt) and rare-earth metals (especially neodymium, samarium, praseodymium, dysprosium, terbium) are characterized by the fact that they simultaneously have a high magnetic remanence flux density B r and a high magnetic coercive force H cJ and thus a high magnetic energy density ( BH) max have. Common rare earth magnets are made (SmCo 5 and Sm 2 Co 17) as neodymium-iron-boron (Nd2Fe14B) or samarium-cobalt. the magnetic energy density of rare earth magnet is usually higher than that of steel magnets, by a multiple, For example, consisting of AlNiCo. By the - compared to a conventional ring magnet - smaller dimensions of the rare earth magnet v also reduces the weight of the permanent magnet and thus the signal converter.

Der Permanentmagnet wird in der Regel aus Symmetriegründen als Kreisscheibe ausgebildet sein, wobei der Mittelpunkt der Kreisscheibe auf der Längsachse des Jochs liegt.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.

Besonders günstig ist es, wenn der Permanentmagnet einen Durchmesser aufweist, der kleiner als der Außendurchmesser der Spule, aber größer als der Innendurchmesser der Spule ist. Der Permanentmagnet könnte aber auch gleich groß oder größer als der Außendurchmesser der Spule sein. Bestimmend für die Auslegung der Abmessungen des Permanentmagneten ist der benötigte magnetische Fluss und somit im Wesentlichen die Magnetfläche AM.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.

Es kann vorgesehen sein, dass der größte Durchmesser des Jochs, insbesondere der Jochplatte, den gleichen Außendurchmesser aufweist wie die Spule.It can be provided that the largest diameter of the yoke, in particular the yoke plate, has the same outer diameter as the coil.

Der Signalwandler kann so aufgebaut sein, dass ein Luftspalt, der sogenannte Streuspalt, zwischen einer Umfangsfläche des Jochs, insbesondere einer Umfangsfläche der Jochplatte, und dem Gehäuse vorliegt. Dieser Luftspalt hat somit beispielsweise die Form eines Zylindermantels. Der Luftspalt zwischen Jochplatte und Gehäuse bewirkt eine Krafterzeugung gemäß F = B2*A/2µo.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 housing causes a force generation according to F = B 2 * A / 2μ o .

Es kann vorgesehen sein, dass das Joch, insbesondere die Jochplatte, eine Ausnehmung in der Stirnseite aufweist, die dem Permanentmagneten zugewandt ist, sodass der Permanentmagnet zumindest teilweise im Joch aufgenommen ist. Dies bewirkt eine Lagefixierung des Permanentmagneten sowie des Jochs.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 und mit gleichem Effekt kann vorgesehen sein, dass das weichmagnetische Gehäuse eine Ausnehmung aufweist, die dem Permanentmagneten zugewandt ist, sodass der Permanentmagnet zumindest teilweise im Gehäuse aufgenommen ist.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.

Eine Ausführungsform der Erfindung besteht darin, dass der Permanentmagnet mit seinen Stirnseiten sowohl mit dem Joch, insbesondere der Jochplatte, als auch mit dem Gehäuse in Kontakt steht. Auf diese Weise wird ein zusätzlicher Luftspalt vermieden. Dies bedingt eine gute Magnetisierung der Jochplatte und des Gehäuses, die magnetischen Feldlinien verlaufen hauptsächlich in diesem Bereich.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.

Die Erfindung wird nun anhand von Ausführungsbeispielen näher erläutert. Die Zeichnungen sind beispielhaft und sollen den Erfindungsgedanken zwar darlegen, ihn aber keinesfalls einengen oder gar abschließend wiedergeben.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.

Dabei zeigt:

Fig. 1
einen Längsschnitt durch einen schematisch dargestellten Signalwandler nach dem Stand der Technik,
Fig. 2
einen Längsschnitt durch einen schematisch dargestellten erfindungsgemäßen Signalwandler,
Fig. 3
den Längsschnitt aus Fig. 1 mit magnetischen Feldlinien,
Fig. 4
den Längsschnitt aus Fig. 2 mit magnetischen Feldlinien,
Fig. 5
einen Längsschnitt durch einen alternativen erfindungsgemäßen Signalwandler,
Fig. 6
Längsschnitte aus Fig. 5 mit unterschiedlichen magnetischen Feldlinien aufgrund unterschiedlicher Spulenanregung.
Showing:
Fig. 1
a longitudinal section through a schematically illustrated signal converter according to the prior art,
Fig. 2
a longitudinal section through a schematically illustrated signal converter according to the invention,
Fig. 3
the longitudinal section Fig. 1 with magnetic field lines,
Fig. 4
the longitudinal section Fig. 2 with magnetic field lines,
Fig. 5
a longitudinal section through an alternative signal converter according to the invention,
Fig. 6
Longitudinal cuts off Fig. 5 with different magnetic field lines due to different coil excitation.

WEGE ZUR AUSFÜHRUNG DER ERFINDUNGWAYS FOR CARRYING OUT THE INVENTION

Fig. 1 zeigt einen herkömmlichen Signalwandler. Er besteht im Wesentlichen aus einem Joch 1, einer Spule 2, einem Ringmagneten 3 und einem plattenförmigen Anker 4. Eine Umhausung, die alle genannten Teile des Signalwandlers umschließt und gegen Umwelteinflüsse schützt, ist hier nicht dargestellt. 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.

Das Joch 1 ist, wie auch die Spule 2, der Ringmagnet 3 und der Anker 4, rotationssymmetrisch um die Längsachse 5 ausgebildet. Es ist einteilig hergestellt, weist aber längs der Längsachse 5 Bereiche mit unterschiedlichem Durchmesser auf, einen stabförmigen Teil, also einen Mittelschenkel oder Jochkern 6 mit kleinerem Durchmesser, und einen scheibenförmigen Teil, also eine Jochplatte 7 mit größerem Durchmesser. Der Jochkern 6 ist in der Regel länger als die Jochplatte 7. Die Länge des Jochkerns 6 ist so bemessen, dass er die Spule 2 ganz durchdringt, die konzentrisch zum Joch 1 auf dieses aufgesetzt ist. Die Jochplatte 7 ist in der Regel so bemessen, dass sie zumindest den gleichen oder einen größeren Durchmesser hat als die Spule 2. Das Joch 1 kann z.B. aus magnetischem Edelstahl oder Mu-Metall gefertigt sein.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 with different diameters, a rod-shaped part, ie a center leg or yoke core 6 with smaller diameter, and a disc-shaped part, ie a yoke plate 7 of 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 be made of magnetic stainless steel or mu-metal, for example.

In Fig. 1 ist der Durchmesser der Jochplatte 7 so groß wie jener des Ringmagneten 3. Der Ringmagnet 3 ist konzentrisch zum Joch 1 angeordnet und hier - in Richtung der Längsachse 5 gemessen - höher als die Spule 2. Der Ringmagnet 3 ist parallel zur Längsachse 5 magnetisiert und ist z.B. als AlNiCo-Magnet ausgeführt. Der Ringmagnet 3 sitzt mit einer Stirnfläche an jener Stirnfläche der Jochplatte 7, die dem Jochkern 6 zugewandt ist. Mit seiner anderen Stirnfläche reicht der Ringmagnet 3 bis auf einen Arbeitsluftspalt 8 für den Anker 4 an den Anker 4 heran. Auch der Jochkern 6 reicht mit seiner Stirnfläche bis auf einen Arbeitsluftspalt 8 für den Anker 4 an den Anker 4 heran.In Fig. 1 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 magnetized parallel to the longitudinal axis 5 and is eg 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.

Der Anker 4 kann aus dem gleichen Material gefertigt sein wie das Joch 1. Der Anker 4 ist elastisch - etwa an der hier nicht dargestellten Umhausung des Signalwandlers - federnd aufgehängt, sodass er sich frei gegenüber dem Joch 1 und dem Ringmagneten 3 bewegen kann, und zwar längs der Längsachse 5.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 liegt - bei der Betrachtung des Signalwandlers als Magnetkreis - eine Reihenschaltung der magnetischen Widerstände von Arbeitsluftspalt 8, Jochkern 6, Jochplatte 7, Ringmagnet 3, Arbeitsluftspalt 8 und Anker 4 vor. Beide magnetischen Flüsse (elektrisch erregt durch Spule 2 und permanenterregt durch Ringmagnet 3) benutzen diesen Pfad. Dabei ist der magnetische Widerstand des AlNiCo-Magneten wegen seiner großen Magnethöhe (in Richtung der Längsachse 5) und der relativ kleinen Fläche (normal zur Längsachse 5) sehr groß und bestimmend für die Anordnung.In Fig. 1 is - when viewing the signal converter as a magnetic circuit - a series connection 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.

In Fig. 2 ist ein erfindungsgemäßer Signalwandler dargestellt. Er besteht im Wesentlichen aus einem Joch 1, einer Spule 2, und einem plattenförmigen Anker 4 sowie - im Unterschied zu Fig. 1 - aus einem plattenförmigen, hier kreisscheibenförmigen, Permanentmagneten 9 und einem Gehäuse (oder Topf) 10, hier bestehend aus Mantel 12 und Grundplatte (Boden) 11. Eine Umhausung, die alle genannten Teile des Signalwandlers umschließt und gegen Umwelteinflüsse schützt, ist hier nicht dargestellt.In Fig. 2 an inventive signal converter is shown. It consists essentially of a yoke 1, a coil 2, and a plate-shaped armature 4 and - in contrast to Fig. 1 - From a plate-shaped, here circular disc-shaped, permanent magnet 9 and a housing (or pot) 10, here consisting of jacket 12 and base plate (bottom) 11. A housing enclosing all the above parts of the transducer and protects against environmental influences is not shown here ,

Das Joch 1 ist, wie auch die Spule 2, der Permanentmagnet 9, der Anker 4, und das Gehäuse 10, rotationssymmetrisch um die Längsachse 5 des Jochs 1 ausgebildet. Das Joch 1 ist einteilig hergestellt, weist aber längs der Längsachse 5 wieder Bereiche mit unterschiedlichem Durchmesser auf, einen Jochkern 6 mit kleinerem Durchmesser und eine Jochplatte 7 mit größerem Durchmesser. Beide Teile 6, 7 haben hier eine zylindrische Form. Der Jochkern 6 ist in der Regel länger als die Jochplatte 7. Die Länge des Jochkerns 6 ist so bemessen, dass er die Spule 2 ganz durchdringt, die konzentrisch zum Joch 1 auf dieses aufgesetzt ist. Hier hat der Jochkern 6 ungefähr die gleiche Länge bzw. Höhe wie die Spule 2. Die Jochplatte 7 ist in der Regel so bemessen, dass sie zumindest den gleichen - wie hier - oder einen größeren Durchmesser hat als die Spule 2. Das Joch 1 kann z.B. wieder aus magnetischem Edelstahl oder Mu-Metall gefertigt sein. Der Anker 4 kann aus dem gleichen Material gefertigt sein wie das Joch 1.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

Der Anker 4 ist, z.B. an einer Feder, mechanisch aufgehängt. Durch die magnetische Vorspannung des weichmagnetischen Kreises, bestehend aus Joch 1, Anker 4 und Gehäuse 10, mittels Permanentmagneten 9 wird der Anker 4 vom Joch 1 und vom Gehäuse 10 angezogen und der Ruhe-Arbeitsluftspalt 8 stellt sich ein. Die Spule 2 wird bestromt und je nach Polarität des Stroms wird der magnetische Fluss des Permanentmagneten 9 verstärkt oder vermindert. Dadurch ändert sich die magnetische Kraft auf den Anker 4 und dieser bewegt sich proportional zur Stromänderung. Die Bewegung des Ankers 4 wird - etwa über eine Umhausung - auf den Schädelknochen übertragen.The armature 4 is mechanically suspended, for example on a spring. By 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 from the yoke 1 and the housing 10 tightened and the resting working air gap 8 is set. 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.

Der Durchmesser des Permanentmagneten 9 ist hier kleiner als jener der Jochplatte 7. Er beträgt etwa nur zwei Drittel des Durchmessers des scheibenförmigen Teils 7. Der Permanentmagnet 9 ist konzentrisch zum Joch 1 angeordnet und hier - in Richtung der Längsachse 5 gemessen - dünner als die Spule 2 oder die Jochplatte 7. Der Permanentmagnet 9 ist ein Seltenerdmagnet und parallel zur Längsachse 5 magnetisiert. Der Permanentmagnet 9 berührt mit einer Stirnfläche die Jochplatte 7 an deren Stirnfläche, die dem Jochkern 6 abgewandt ist. Mit seiner anderen Stirnfläche kontaktiert der Permanentmagnet 9 das Gehäuse 10, nämlich dessen Grundplatte 11.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.

Das Gehäuse 10 ist topfförmig und weist hier eine ebene Grundplatte 11 sowie einen zylindrischen Mantel 12 auf. Das Gehäuse 10 ist hier einteilig gefertigt. Es kann aus dem gleichen weichmagnetischen Material gefertigt sein wie das Joch 1 oder der plattenförmige Anker 4.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

Das Gehäuse 10 umschließt gemeinsam mit dem Anker 4 das Joch 1, die Spule 2 sowie den Permanentmagneten 9. Zwischen der Stirnfläche des zylindrischen Mantels 12 des Gehäuses 10 und dem Anker 4 ist ein Arbeitsluftspalt 8 vorgesehen. Der Anker 4 ist elastisch an einer hier nicht dargestellten Umhausung des Signalwandlers aufgehängt, damit er gemäß dem von der Spule 2 vorgegebenen variablen Magnetfeld in Richtung der Längsachse 5 schwingen kann. Ebenso reicht der Jochkern 6 mit seiner Stirnfläche bis auf einen Arbeitsluftspalt 8 für den Anker 4 an den Anker 4 heran.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.

Die Grundplatte 11 des Gehäuses 10 weist an ihrer Innenseite eine kreisscheibenförmige Ausnehmung auf, in welche der Permanentmagnet 9 eingesetzt ist. Die Tiefe der Ausnehmung - entlang der Längsachse 5 gemessen - entspricht hier etwa einem Viertel der Dicke des Permanentmagneten 9, sodass dieser noch etwa zur Hälfte aus den Ausnehmungen herausragt. Ebenso weist die Jochplatte 7 eine kreisscheibenförmige Ausnehmung in der Stirnseite auf, die dem Permanentmagneten 9 zugewandt ist und in die der Permanentmagnet 9 eingesetzt ist. Die Tiefe der Ausnehmung - entlang der Längsachse 5 gemessen - entspricht hier ebenfalls etwa einem Viertel der Dicke des Permanentmagneten 9. Es ist ein radialer Abstand des Permanentmagneten 9 zur Wand jeder Ausnehmung vorgesehen. Dieser Abstand dient der einfachen Zentrierung von Permanentmagnet 9 und vor allem des Luftspaltes (Streuspaltes) 14. Die Ausnehmung in der Jochplatte 7 ist hier gleich groß wie jene in der Grundplatte 11.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 about one quarter of the thickness of the permanent magnet 9, so that this still protrudes about half of 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. It 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

Zwischen der, dem Permanentmagneten 9 zugewandten, Stirnfläche der Jochplatte 7 und der Grundplatte 11 des Gehäuses 10 liegt ein Luftspalt 13, der hier kreisringförmig ist. Seine radiale Breite - normal zur Längsachse 5 gemessen - beträgt hier etwa ein Drittel des Radius der Jochplatte 7, seine axiale Höhe - in Richtung der Längsachse 5 gemessen - ist hier kleiner als die Höhe des Permanentmagneten 9. Bei anderen Ausführungsformen der Erfindung kann der Luftspalt 13 selbstverständlich andere relative radiale Breiten und axiale Höhen aufweisen. Zwischen der Umfangsfläche der Jochplatte 7 und dem Mantel 12 des Gehäuses 10 befindet sich ein weiterer Luftspalt 14. Seine axiale Höhe - in Richtung der Längsachse 5 gemessen - entspricht der Höhe der Jochplatte 7.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

Die beiden Luftspalte 13, 14 gehen ineinander über, sodass ein durchgehender, abgewinkelter Luftspalt zwischen der Umfangsfläche des Permanentmagneten 9 und dem Anker 4 entsteht.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.

Die Luftspalte 13, 14 werden im Zusammenhang mit dem Permanentmagneten 9 so ausgelegt, dass eine genügend hohe magnetische Vorspannung durch den Permanentmagneten 9 erzeugt wird und für den elektrisch erregten Fluss der Spule 2 die magnetischen Widerstände so klein wie möglich gehalten werden. Dies betrifft besonders die Parallelschaltung der magnetischen Widerstände von Permanentmagnet 9, Luftspalt 13 und Luftspalt 14. Der Arbeitsluftspalt 8 ist durch seine Funktion als Ankerbewegungsraum vorgegeben. Im weichmagnetischen Material sollten in der Regel keine großen magnetischen Widerstände (magn. Spannungsabfälle) entstehen. Die Auslegung des Signalwandlers, insbesondere der Luftspalte 13, 14, des Permanentmagneten 9, aber auch der Form und Abmessungen der Jochplatte 7, kann wieder durch Berechnung des oben erwähnten magnetischen Kreises erfolgen, wo die einzelnen Bauelemente (magnetischer Leiter, magnetische Widerstände, magnetisches Koppelelement) entsprechend miteinander verschaltet sind.The air gaps 13, 14 are designed in connection with the permanent magnet 9 so that a sufficiently high magnetic bias voltage 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.

Der sich aus dem erfindungsgemäßen Signalwandler ergebende unterschiedliche Verlauf der magnetischen Feldlinien ist durch Vergleich der Fig. 3 und 4 ersichtlich. Dabei sind sowohl die Feldlinien 15 des jeweiligen Permanentmagneten, also des Ringmagneten 3 aus Fig. 1 und des scheibenförmigen Permanentmagneten 9 aus Fig. 2, als auch die Feldlinien 16 der Spule 2 dargestellt.The resulting from the signal converter according to the invention different course of the magnetic field lines is by comparing the 3 and 4 seen. In this case, both the field lines 15 of the respective permanent magnet, so the ring magnet 3 are made Fig. 1 and the disc-shaped permanent magnet 9 Fig. 2 , as well as the field lines 16 of the coil 2 shown.

In Fig. 3 sind die Feldlinien des Signalwandlers aus Fig. 1 eingezeichnet. Sowohl die durch den Ringmagneten 3 hervorgerufenen Feldlinien 15 als auch die durch die Spule 2 hervorgerufenen Feldlinien 16 befinden sich durchgehend in den gleichen Bereichen. Sie verlaufen nämlich in Richtung der Längsachse 5 durch den Jochkern 6, radial durch den Anker 4 in den Ringmagneten 3, in Richtung der Längsachse 5 durch den Ringmagneten 3 und radial durch die Jochplatte 7 wieder in den Jochkern 6. Das bedeutet, dass auch der Spulenfluss den hohen magnetischen Widerstand des Ringmagneten 3 überwinden muss.In Fig. 3 are the field lines of the signal converter off Fig. 1 located. Both caused by the ring magnet 3 field lines 15 as well as caused by the coil 2 field lines 16 are continuously 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.

In Fig. 4 sind die Feldlinien des Signalwandlers aus Fig. 2 eingezeichnet. Zwar verlaufen auch hier die durch den Permanentmagneten 9 hervorgerufenen Feldlinien 15 zum Teil durch die gleichen Bereiche wie die durch die Spule 2 hervorgerufenen Feldlinien 16. Sie verlaufen nämlich in Richtung der Längsachse 5 durch den Jochkern 6, radial durch den Anker 4 in den Mantel 12 des Gehäuses 10, in Richtung der Längsachse 5 durch den Mantel 12 und radial durch die Grundplatte 11 des Gehäuses 10 wieder in Längsrichtung durch den Permanentmagneten 9 in den Jochkern 6.In Fig. 4 are the field lines of the signal converter off Fig. 2 located. 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 6th

Allerdings werden die Magnetfelder durch die Anordnung der Jochplatte 7 zwischen dem Permanentmagneten 9 und der Spule 2 entsprechend den Weichmagnetika geleitet und teilen sich in Abhängigkeit der magnetischen Widerstände auf, die hauptsächlich durch die Luftspalte 13, 14 und den Permanentmagneten 9 bestimmt werden. Auf diese Weise bilden sich auch Feldlinien 15 des Permanentmagneten 9, die nur im Bereich des Permanentmagneten 9, der Jochplatte 7, der Grundplatte 11 des Gehäuses 10 und des zylindrischen Mantels 12 des Gehäuses 10 verlaufen, jedoch in Richtung der Längsachse 5 nicht über die Höhe der Jochplatte 7 hinaus. Diese Feldlinien 15 dringen daher nicht in die Spule 2 ein, während andere Feldlinien 15 dies sehr wohl tun, nur sind es so wenige, dass diese hier nicht eingezeichnet sind.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.

Ebenso ändert ein Teil der Feldlinien 16 der Spule 2 ihren Verlauf: sie gelangen nicht bis zur Grundplatte 11 des Gehäuses 10, sondern verlaufen durch die Jochplatte 7, und damit dem Permanentmagneten 9 ausweichend, um sich durch den Mantel 12 des Gehäuses 10 bzw. durch den Jochkern 6 des wieder im Anker 4 zu schließen. So verlaufen einige Feldlinien 16 vom Anker 4 axial durch den Jochkern 6 Richtung Permanentmagnet 9, vor dem Permanentmagneten 9 radial durch die Jochplatte 7, dann axial über den ersten Luftspalt 13 zur Grundplatte 11 des Gehäuses 10 und radial nach außen über die Grundplatte 11 in den Mantel 12 und wieder in den Anker 4.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.

Ein Teil der magnetischen Feldlinien 16 des durch die Spule 2 erzeugten Magnetfeldes zwischen Joch 1 und Gehäuse 10 verläuft also durch die Jochplatte 7 und nicht durch den Permanentmagneten 9.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 zeigt einen Längsschnitt durch einen alternativen erfindungsgemäßen Signalwandler, wobei nur eine Hälfte des Signalwandlers schematisch dargestellt ist. Der Signalwandler in Fig. 5 ist grundsätzlich gleich wie in Fig. 2 aufgebaut, unterscheidet sich von Fig. 2 jedoch dadurch, dass Spule 2 und Permanentmagnet 9 den gleichen Außendurchmesser haben, der aber kleiner ist als der Außendurchmesser der Jochplatte 7. Somit ergeben sich auch andere Dimensionen bei den Luftspalten 13, 14. Darüber hinaus ist in Fig. 5 auch die Höhe der Spule 2 geringer als die Höhe des Jochkerns 6. 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 built, different from Fig. 2 However, characterized 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, there are also other dimensions in the air gaps 13, 14. In addition, in Fig. 5 Also, the height of the coil 2 is less than the height of the yoke core. 6

In Fig. 6 ist der Längsschnitte aus Fig. 5 dreimal dargestellt, zusätzlich sind die magnetischen Feldlinien bei unterschiedlicher elektrischer Durchflutung eingezeichnet. Links ist das Magnetfeld ohne Bestromung der Spule 2 dargestellt, in der Mitte mit Bestromung der Spule 2 ("100 A") im Sinne einer Verstärkung des Magnetfelds des Permanentmagneten 9, rechts mit Bestromung der Spule 2 ("-100 A"), allerdings im Sinne einer Kompensation des Magnetfelds des Permanentmagneten 9. Es ist in der linken Abbildung gut erkennbar, dass die Dichte der magnetischen Feldlinien innerhalb der Spule 2 gering ist.In Fig. 6 is the longitudinal cuts off Fig. 5 shown three times, in addition, the magnetic field lines are drawn at different electrical flooding. On the left, the magnetic field without energization of the coil 2 is shown, in the middle with energization of the coil 2 ("100 A") in the sense of amplifying the magnetic field of the permanent magnet 9, right with energization of the coil 2 ("-100 A"), however 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.

Der gegenständliche Signalwandler findet Verwendung in Hör- und Kommunikationssystemen sowie zur Audiodiagnostik, der zugehörige Knochenleitungshörer (Osteophon) wird getragen und angewendet am menschlichen oder tierischen Schädel. Entsprechend der Verwendung ist die Größe des Knochenleitungshörers und damit des Signalwandlers zu dimensionieren. Bei manchen Ausführungsvarianten des gegenständlichen Signalwandlers ist dieser sehr klein, dann beträgt seine Höhe von der Grundplatte 11 des Gehäuses 10 bis zum Anker längs der Längsachse 5 etwa 2-10 mm, der Durchmesser des Gehäuses 10 bzw. des etwa gleich großen Ankers 4 5-20 mm. Der scheibenförmige Permanentmagnet weist beispielsweise eine Dicke von 0,5-0,7 mm auf, die Dicke kann aber auch kleiner als 0,5 mm oder größer als 0,7 mm sein. Bei anderen Ausführungsvarianten kann der Durchmesser des Gehäuses 10 auch im Bereich von einigen Zentimetern liegen, etwa bis zu 6 oder 7 cm, oder sogar bis 10 cm. Auch noch größere Signalwandler, etwa für Tiere größer als der Mensch, sind denkbar.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. In 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 anchor of approximately equal size 5 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.

Eine andere Ausführungsform eines erfindungsgemäßen Signalwandlers wäre die rechteckige Ausführung, wo Permanentmagnet 9, Jochplatte 7 und Spule 2 in Richtung der Längsachse 5 gesehen eine im Wesentlichen rechteckige Form haben.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.

Die Erfindung, siehe insbesondere Fig. 2 und 5, teilt die magnetischen Flüsse auf und sorgt für einen kleinen magnetischen Widerstand des Permanentmagneten 9 durch geringe Höhe und große Fläche, was am besten durch SE-Magnete verwirklicht werden kann. Außerdem sorgen die aus Sicht der elektrischen Erregung parallelgeschalteten Flusspfade des Luftspalts 14 (Streuspaltes) und des Luftspaltes 13 neben dem Permanentmagneten 9 zu einer weiteren signifikanten Senkung des magnetischen Gesamtwiderstandes. Durch diese "Streuwege" wird dem Arbeitsluftspalt 8 zwar magnetischer Fluss der permanentmagnetischen Erregung zur magnetischen Vorspannung entzogen. Allerdings ist die Magnetfläche im Vergleich zu jener in Fig. 1 auch größer, um dies auszugleichen. Im Zuge der Auslegung des erfindungsgemäßen Signalwandlers ist auch darauf zu achten, dass der Streusteg, also die Jochplatte 7 in ihrem äußeren Bereich, wo beide magnetischen Flüsse sich addieren, nicht gesättigt wird.The invention, see in particular Fig. 2 and 5 Shares the magnetic fluxes and provides a small magnetic resistance of the permanent magnet 9 by low 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. Through this "scattering paths" while the working air gap 8 Although magnetic flux of permanent magnetic excitation for magnetic bias is removed. However, the magnetic surface is compared to that in Fig. 1 also larger to compensate for this. In the course of the design of the signal converter according to the invention is also important to ensure that the scattering, so the yoke plate 7 is not saturated in its outer region, where both magnetic fluxes add up.

BEZUGSZEICHENLISTELIST OF REFERENCE NUMBERS

11
Jochyoke
22
elektrische Spuleelectric coil
33
Ringmagnetring magnet
44
Ankeranchor
55
Längsachselongitudinal axis
66
Jochkern des Jochs 1Yoke core of the yoke 1
77
Jochplatte des Jochs 1Yoke plate of the yoke 1
88th
ArbeitsluftspaltWorking air gap
99
Permanentmagnetpermanent magnet
1010
Gehäusecasing
1111
Grundplatte des Gehäuses 10Base plate of the housing 10
1212
zylindrischer Mantel des Gehäuses 10cylindrical jacket of the housing 10
1313
Luftspalt (Streuspalt zwischen Jochplatte 6 und Grundplatte 11)Air gap (spreading gap between yoke plate 6 and base plate 11)
1414
Luftspalt (Streuspalt zwischen Jochplatte 6 und Mantel 12)Air gap (spreading gap between yoke plate 6 and shell 12)
1515
Feldlinie des Permanentmagneten 9 oder des Ringmagneten 3Field line of the permanent magnet 9 or the ring magnet. 3
1616
Feldlinie der Spule 2Field line of the coil 2

Claims (14)

Elektromagnetischer Signalwandler für einen Knochenleitungshörer, umfassend - ein weichmagnetisches Joch (1), - eine konzentrisch zur Längsachse des Jochs (1) angeordnete elektrische Spule (2), - einen elastisch aufgehängten weichmagnetischen Anker (4), der, in Richtung der Längsachse (5) des Jochs (1) gesehen, durch einen Arbeitsluftspalt (8) vom Joch (1) getrennt und entlang der Längsachse (5) des Jochs (1) beweglich ist, sowie - einen Permanentmagneten (9), der in Richtung der Längsachse (5) des Jochs (1) magnetisiert ist, um eine magnetische Vorspannung des Jochs (1) und des Ankers (4) zu erzeugen, dadurch gekennzeichnet, dass Permanentmagnet (9) und Spule (2) einander in Richtung der Längsachse des Jochs (1) nicht überlappen und Mittel vorgesehen sind, um den durch die Spule (2) erzeugbaren magnetischen Fluss auf zumindest zwei Flusspfade aufzuteilen, wobei ein Flusspfad außerhalb des Permanentmagneten (9) verläuft. An electromagnetic transducer for a bone conduction listener, 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), seen in the direction of the longitudinal axis (5) of the yoke (1), separated by a working air gap (8) from the yoke (1) and along the longitudinal axis (5) of the yoke (1) is mobile, as well - A permanent magnet (9) which is magnetized in the direction of the longitudinal axis (5) of the yoke (1) to produce a magnetic bias of the yoke (1) and the armature (4), characterized in that 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 dividing the magnetic flux which can be generated by the coil (2) into at least two flow paths, a flux path extending outside the permanent magnet (9). Signalwandler nach Anspruch 1, dadurch gekennzeichnet, dass der durch die Spule (2) erzeugbare magnetische Fluss durch das Joch (1) auf einen Flusspfad außerhalb des Permanentmagneten (9) lenkbar ist.Signal converter according to Claim 1, characterized in that the magnetic flux which can be generated by the coil (2) can be directed through the yoke (1) to a flow path outside the permanent magnet (9). Signalwandler nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Joch (1) einen längs der Längsachse (5) des Jochs ausgerichteten stabförmigen Jochkern (6) und eine normal zur Längsachse angeordnete Jochplatte (7) umfasst, wobei der Jochkern (6) in die Spule (2) ragt und die Jochplatte (7) einer Stirnseite der Spule (2) zugewandt ist, und der durch die Spule (2) erzeugbare magnetische Fluss durch die Jochplatte (7) auf einen Flusspfad außerhalb des Permanentmagneten (9) lenkbar ist.Signal converter according to claim 1 or 2, characterized in that the yoke (1) comprises a 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) in the coil (2) protrudes and the yoke plate (7) faces an end face of the coil (2), and the coil (2) producible magnetic flux through the yoke plate (7) on a flow path outside the permanent magnet (9) is steerable. Signalwandler nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Permanentmagnet (9) bezüglich des Jochs (1) dem Anker (4) gegenüber liegend angeordnet ist.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. Signalwandler nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass Permanentmagnet (9), Joch (1) und Spule (2) von einem weichmagnetischen Gehäuse (10) umgeben sind, das durch einen Luftspalt (13, 14) vom Anker (4) und vom Joch (1) getrennt ist, sodass der durch die Spule (2) erzeugbare magnetische Fluss durch das weichmagnetische Gehäuse (10) auf einen Flusspfad außerhalb des Permanentmagneten (9) lenkbar ist.Signal converter according to one of Claims 1 to 4, characterized in that the permanent magnet (9), yoke (1) and coil (2) are surrounded by a soft-magnetic housing (10) which is separated from the armature (4) by an air gap (13, 14) ) and is separated from the yoke (1) so that the magnetic flux which can be generated by the coil (2) can be directed through the soft magnetic housing (10) to a flow path outside the permanent magnet (9). Signalwandler nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Permanentmagnet (9) plattenförmig ausgebildet ist.Signal converter according to one of claims 1 to 5, characterized in that the permanent magnet (9) is plate-shaped. Signalwandler nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Permanentmagnet (9) ein Seltenerdmagnet ist.Signal converter according to one of claims 1 to 6, characterized in that the permanent magnet (9) is a rare earth magnet. Signalwandler nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Permanentmagnet (9) als Kreisscheibe ausgebildet ist, wobei der Mittelpunkt der Kreisscheibe auf der Längsachse (5) des Jochs (1) liegt.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). Signalwandler nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Permanentmagnet (9) einen Durchmesser aufweist, der kleiner als der Außendurchmesser der Spule (2), aber größer als der Innendurchmesser der Spule (2) ist.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). Signalwandler nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der größte Durchmesser des Jochs (1), insbesondere der Jochplatte (7), den gleichen Außendurchmesser aufweist wie die Spule (2).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). Signalwandler nach einem der Ansprüche 6 bis 10, dadurch gekennzeichnet, dass ein Luftspalt zwischen einer Umfangsfläche des Jochs (1), insbesondere einer Umfangsfläche der Jochplatte (7), und dem Gehäuse (10) vorliegt.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. Signalwandler nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass das Joch (1), insbesondere die Jochplatte (7), eine Ausnehmung in der Stirnseite aufweist, die dem Permanentmagneten (9) zugewandt ist, sodass der Permanentmagnet (9) zumindest teilweise im Joch aufgenommen ist.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 recorded in the yoke. Signalwandler nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass das weichmagnetische Gehäuse (10) eine Ausnehmung aufweist, die dem Permanentmagneten (9) zugewandt ist, sodass der Permanentmagnet (9) zumindest teilweise im Gehäuse (10) aufgenommen ist.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 received in the housing (10). Signalwandler nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass der Permanentmagnet (9) mit seinen Stirnseiten sowohl mit dem Joch (1), insbesondere der Jochplatte (7), als auch mit dem Gehäuse (10) in Kontakt steht.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) in contact.
EP16158871.0A 2015-03-05 2016-03-07 Electromagnetic signal converter for a bone conduit earpiece Active EP3065420B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50175/2015A AT516871B1 (en) 2015-03-05 2015-03-05 Electromagnetic transducer for a bone conduction listener

Publications (2)

Publication Number Publication Date
EP3065420A1 true EP3065420A1 (en) 2016-09-07
EP3065420B1 EP3065420B1 (en) 2020-06-24

Family

ID=55484894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16158871.0A Active EP3065420B1 (en) 2015-03-05 2016-03-07 Electromagnetic signal converter for a bone conduit earpiece

Country Status (5)

Country Link
US (1) US9699566B2 (en)
EP (1) EP3065420B1 (en)
CN (1) CN106060724B (en)
AT (1) AT516871B1 (en)
DK (1) DK3065420T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022128063A1 (en) 2020-12-14 2022-06-23 Bhm-Tech Produktionsgesellschaft M.B.H. Electromagnetic signal converter for a bone conduction receiver

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019237726A1 (en) 2018-06-15 2019-12-19 深圳市韶音科技有限公司 Bone conduction speaker and testing method therefor
US10290463B2 (en) * 2017-04-27 2019-05-14 Imatrex, Inc. Compact deflecting magnet
JP2022047020A (en) * 2020-09-11 2022-03-24 リオン株式会社 Electromechanical converter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE447948B (en) * 1985-05-15 1986-12-22 Bo Hakansson Vibrator for hearing aid
US20030034705A1 (en) * 2000-03-09 2003-02-20 Bo Hakansson Electromagnetic vibrator
US20040028249A1 (en) * 2000-06-02 2004-02-12 Kristian Asnes Vibrator for boneconducted hearing aids
US20040236176A1 (en) * 2001-06-21 2004-11-25 Kristian Asnes Vibrator damping

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200401424Y1 (en) * 2005-09-08 2005-11-15 이동원 Bone conductive speaker
US8385583B2 (en) * 2008-08-29 2013-02-26 The Penn State Research Foundation Methods and apparatus for reduced distortion balanced armature devices
US20120029267A1 (en) * 2010-06-21 2012-02-02 Vibrant Med-El Hearing Technology Gmbh Electromagnetic Bone Conduction Hearing Device
IT1399082B1 (en) * 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.
CN104885481B (en) * 2012-07-09 2018-05-29 Med-El电气医疗器械有限公司 Electromagnetism bone conduction hearing device
CN203840522U (en) * 2014-03-24 2014-09-17 项泽玉 Mute bone conduction electromagnetic vibration transducer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE447948B (en) * 1985-05-15 1986-12-22 Bo Hakansson Vibrator for hearing aid
US20030034705A1 (en) * 2000-03-09 2003-02-20 Bo Hakansson Electromagnetic vibrator
US20040028249A1 (en) * 2000-06-02 2004-02-12 Kristian Asnes Vibrator for boneconducted hearing aids
US20040236176A1 (en) * 2001-06-21 2004-11-25 Kristian Asnes Vibrator damping

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022128063A1 (en) 2020-12-14 2022-06-23 Bhm-Tech Produktionsgesellschaft M.B.H. Electromagnetic signal converter for a bone conduction receiver

Also Published As

Publication number Publication date
AT516871B1 (en) 2018-03-15
US20160261958A1 (en) 2016-09-08
AT516871A1 (en) 2016-09-15
EP3065420B1 (en) 2020-06-24
US9699566B2 (en) 2017-07-04
DK3065420T3 (en) 2020-09-21
CN106060724A (en) 2016-10-26
CN106060724B (en) 2020-03-13

Similar Documents

Publication Publication Date Title
DE1815694C2 (en) Electrodynamic converter system
DE3730305C1 (en) speaker
DE69935334T2 (en) LOW FREQUENCY SCHWINGER
DE19913558A1 (en) Loudspeaker construction for reduced production costs
EP3065420B1 (en) Electromagnetic signal converter for a bone conduit earpiece
DE60308659T2 (en) speaker
DE19616794B4 (en) speaker
DE4317775A1 (en) speaker
DE10130909A1 (en) Vibration speaker with double magnet
DE2331037B2 (en) Electroacoustic converter
DE2832612A1 (en) DYNAMIC SPEAKER
EP1903835A2 (en) Hearing device with supplementary screening device
DE102008008899A1 (en) Charger with homogeneous magnetic field
DE102016202658A1 (en) Speaker module for a hearing aid and hearing aid
DE102016108690A1 (en) Vibrating actuator
EP2375784A2 (en) Hearing aid with amorphous speaker shielding
DE3443907A1 (en) Dynamic telephone receiver capsule for persons with impaired hearing
AT507023B1 (en) DEVICE FOR MAGNETIZING A PERMANENT MAGNET
EP0208907B1 (en) Magnetic system for a dynamic loudspeaker
DE102006002875B4 (en) Transducer magnet system
WO2022128063A1 (en) Electromagnetic signal converter for a bone conduction receiver
DE969603C (en) Improvement in a sound reproducing device
DE102007035968A1 (en) Fanfare for a motor vehicle
DE959924C (en) Electroacoustic transducer, in particular earphone capsule in telephone systems
AT381204B (en) Magnetic system for electrodynamic transducers in particular microphones and headphones

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170307

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20180712

RIC1 Information provided on ipc code assigned before grant

Ipc: H04R 13/00 20060101AFI20190927BHEP

Ipc: H04R 25/00 20060101ALN20190927BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20200110

GRAJ Information related to disapproval of communication of intention to grant by the applicant or resumption of examination proceedings by the epo deleted

Free format text: ORIGINAL CODE: EPIDOSDIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 502016010299

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: H04R0009020000

Ipc: H04R0013000000

GRAR Information related to intention to grant a patent recorded

Free format text: ORIGINAL CODE: EPIDOSNIGR71

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

INTC Intention to grant announced (deleted)
RIC1 Information provided on ipc code assigned before grant

Ipc: H04R 25/00 20060101ALN20200424BHEP

Ipc: H04R 13/00 20060101AFI20200424BHEP

RIC1 Information provided on ipc code assigned before grant

Ipc: H04R 25/00 20060101ALN20200506BHEP

Ipc: H04R 13/00 20060101AFI20200506BHEP

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

INTG Intention to grant announced

Effective date: 20200519

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1285108

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200715

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502016010299

Country of ref document: DE

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

Effective date: 20200914

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200924

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200925

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200924

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20200624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201026

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201024

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502016010299

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20210325

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20210331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210307

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210331

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210331

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210307

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210331

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 1285108

Country of ref document: AT

Kind code of ref document: T

Effective date: 20210307

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210307

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20160307

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200624

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20240327

Year of fee payment: 9

Ref country code: GB

Payment date: 20240322

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20240326

Year of fee payment: 9

Ref country code: DK

Payment date: 20240320

Year of fee payment: 9