WO2003096744A1 - Elements d'un vibrateur electromagnetique - Google Patents

Elements d'un vibrateur electromagnetique Download PDF

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Publication number
WO2003096744A1
WO2003096744A1 PCT/SE2003/000751 SE0300751W WO03096744A1 WO 2003096744 A1 WO2003096744 A1 WO 2003096744A1 SE 0300751 W SE0300751 W SE 0300751W WO 03096744 A1 WO03096744 A1 WO 03096744A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheets
coil
way
magnetic
vibrator
Prior art date
Application number
PCT/SE2003/000751
Other languages
English (en)
Inventor
Bo HÅKANSSON
Original Assignee
Osseofon Ab
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 Osseofon Ab filed Critical Osseofon Ab
Priority to EP03723604A priority Critical patent/EP1504630A1/fr
Priority to AU2003235386A priority patent/AU2003235386A1/en
Priority to KR10-2004-7018075A priority patent/KR20050010791A/ko
Priority to JP2004504565A priority patent/JP2005525762A/ja
Publication of WO2003096744A1 publication Critical patent/WO2003096744A1/fr
Priority to US10/983,015 priority patent/US7471801B2/en

Links

Classifications

    • 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
    • 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
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Definitions

  • the present invention relates to a new solution of the construction of electro magnetic vibrators of variable reluctance design which provides improved efficiency and improved optimization possibilities, in particular to a device for the generation of or monitoring of vibrations according to the principle of variable reluctance comprising a coil for generating/monitoring a magnetic signal flux, a bobbin body of a magnetic flux conducting material, one or more yokes of a magnetic flux conducting material and one or more permanent magnets for the generation of magnetic biasing flux.
  • Electro magnetic vibrators of the variable reluctance principle are used i.a., in bone conduction hearing aids and audiometric vibrators for determining hearing thresholds. It is important that such vibrators are: efficient, small, reliable, and are designed in such a way that their properties can be adapted to the particular application.
  • the technology has been developed i.a., by means of the invention according to SE 0000810-2.
  • the present invention aims to reducing the problem of eddy currents in the iron material conducting the dynamic magnetic flux in variable reluctance vibrators for bone conduction use.
  • the proposed invention is a new vibrator of variable reluctance type, which is characterized in that at least the bobbin body, preferably the whole armature conducting the dynamic magnetic flux is made of laminated metal sheets having good magnetic properties with regard to the intended use.
  • the present invention solves previously known problems, and is characterized in that the bobbin body is made of laminated sheets of a magnetic conducting material.
  • a preferred embodiment of the invention is characterized in that even the yokes are made of laminated sheets of a magnetic conducting material.
  • Another preferred embodiment is characterized in that the sheets are joined (fixed to each other) using glue that forms a layer having low electric conductivity between the sheets.
  • a further preferred embodiment is characterized in that the sheets are made by punching.
  • capacitive impedance is connected in parallel in such a way that parallel resonance occurs in a frequency band where the vibrator is not to consume any energy, e.g., at a switch frequency or at a carrier frequency.
  • a further other preferred embodiment is characterized in that a capacitive impedance (capacitor) is connected in series in such a way that a series resonance is obtained in a frequency band where an efficient transformation from electrical energy to mechanical energy is to be obtained.
  • a capacitive impedance capacitor
  • capacitive impedance is connected in parallel in such a way that parallel resonance occurs and capacitive impedance (capacitor) is connected in series in such a way that a series resonance is obtained.
  • a further preferred embodiment is characterized in that the coil is split in two parts and that a simple cross-over network is arranged to control the distribution of energy between the coils with regard to different frequency bands.
  • This more purified inductive characteristic being a concrete effect of the invention, can be utilized in such a way that the vibrator can be tailor-made to become extremely efficient in certain frequency bands, or having extremely high impedance at other frequency bands. This optimization may easily be carried out using external electrical components.
  • the application of the present invention is not restricted to bone tissue transmitting hearing aids and audio meter vibrators but may also be used in other loud speaker applications and as vibration exciter or as a bone conduction microphone.
  • FIG 2 a preferred exemplifying embodiment is shown which partly or completely solves the weaknesses of eddy current losses in vibrators for bone conduction use.
  • the vibrator (1) has a rectangular symmetry.
  • the H-formed bobbin body (2) is elastically suspended by means of two spring elements (3a, 3b) to the biasing flux unit (4).
  • the signal flux ⁇ ,. being generated by current flowing in the coil (5) placed around the bobbin body/iron core, is circuited shortest possible way through the soft iron material and substantially through axial air gaps (6a, b, c, d) extending in the horizontal plane.
  • the unit for creating a magnetic biasing flux (static flux from the permanent magnets) consists of four magnets (7a, b, c, d), two yokes (8a, b), four bias yokes (9a, b, c, d) and one counter mass (10).
  • the four bias yokes can be designed in such a way that they (9a, b) is one integral unit, and (9c, d) is a second unit. Every magnet biases substantially the closest inner air gap (6a, b, c, d) with the bias flux ⁇ 0 , which also flows through the outer air gaps (11a, b, c, d) and through the bias yokes (9a, b, c, d).
  • the H-formed core/bobbin body (2) around which the coil is placed is laminated as shown in figure 3.
  • the lamination consists of sheets (12) having suitable magnetic properties and which joined using glue, which having a low electrical conductivity forms a thin layer (13) between the sheets.
  • glue which having a low electrical conductivity forms a thin layer (13) between the sheets.
  • the permanent magnets in order to create the static bias flux, can be placed in a number of different ways. It is apparent that the bobbin body in these exemplifying embodiments can be made using rectangular symmetry and that they thereby can be laminated. Also, those yokes, which close the magnetic signal flux path, can be laminated.
  • the electrical impedance of a vibrator according to the invention has a strong inductive characteristic and consists essentially of an inductance (L) and ohmic losses in the coil (R) according to the model of FIG. 4.
  • a capacitor (Ci) may be placed in parallel to the coil (1) to obtain a parallel resonance which means that the vibrator consumes an extremely little power at the resonance frequency according to FIG. 4a. This is of importance when useing digital power amplifiers, e.g., a class D amplifiers where one does not want the vibrator to consume power at the switch or carrier frequency.
  • One may also place the capacitor (C 2 ) in series with the coil according to FIG.
  • capacitors (C 2 ) may be chosen by choosing a suitable value of the capacitor (C 2 ) obtain a very efficient electro magnetic transformation in a certain frequency band, e.g., in the speech frequency band.
  • This solution using C 2 may be combined with using Ci as shown in FIG. 4b where Ci has been drawn in dashed lines.
  • the capacitors C x and C 2 have leakage resistances which have not been shown in FIG. 4.
  • the capacitors may have resistors in series or in parallel to themselves to obtain a desired dampening (Q-value).
  • capacitors (C 3 ) and (C 4 ) may connected in series with the two different coils of the vibrator and function as a cross-over network .
  • One coil (U) is optimized for a good function in a frequency band, e.g., up to 1-2 kHz, and the other coil (L 2 ) is optimized for a good function in a neighbouring frequency band, e.g., above 1-2 kHz.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

L'invention concerne un vibrateur électromagnétique du type à réluctance variable. Ledit vibrateur électromagnétique est de construction nouvelle et présente un meilleur rendement, des dimensions réduites et une meilleure fiabilité par rapport aux modèles connus. A cet effet, le flux de signal magnétique produit par la bobine est fermé à l'aide d'un élément de rotor navette et d'un ou plusieurs colliers de déviation, l'élément de rotor navette et les colliers de déviation étant réalisés en tôles laminées présentant de bonnes propriétés magnétiques.
PCT/SE2003/000751 2002-05-10 2003-05-12 Elements d'un vibrateur electromagnetique WO2003096744A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP03723604A EP1504630A1 (fr) 2002-05-10 2003-05-12 Elements d'un vibrateur electromagnetique
AU2003235386A AU2003235386A1 (en) 2002-05-10 2003-05-12 Means at electromagnetic vibrator
KR10-2004-7018075A KR20050010791A (ko) 2002-05-10 2003-05-12 전자기 바이브레이터에서의 수단
JP2004504565A JP2005525762A (ja) 2002-05-10 2003-05-12 電磁式振動器
US10/983,015 US7471801B2 (en) 2002-05-10 2004-11-05 Device for the generation of or monitoring of vibrations

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0201441A SE522164C2 (sv) 2002-05-10 2002-05-10 Anordning vid elektromagnetisk vibrator
SE0201441-3 2002-05-10

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/983,015 Continuation US7471801B2 (en) 2002-05-10 2004-11-05 Device for the generation of or monitoring of vibrations

Publications (1)

Publication Number Publication Date
WO2003096744A1 true WO2003096744A1 (fr) 2003-11-20

Family

ID=20287847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/000751 WO2003096744A1 (fr) 2002-05-10 2003-05-12 Elements d'un vibrateur electromagnetique

Country Status (6)

Country Link
EP (1) EP1504630A1 (fr)
JP (1) JP2005525762A (fr)
KR (1) KR20050010791A (fr)
AU (1) AU2003235386A1 (fr)
SE (1) SE522164C2 (fr)
WO (1) WO2003096744A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007117200A3 (fr) * 2006-04-12 2007-12-06 Osseofon Ab Procédé de fabrication de transducteurs équilibrés
US7376237B2 (en) 2004-09-02 2008-05-20 Oticon A/S Vibrator for bone-conduction hearing
WO2010110713A1 (fr) * 2009-03-24 2010-09-30 Osseofon Ab Transducteur à conduction osseuse à réponse haute fréquence améliorée
WO2012030270A1 (fr) * 2010-08-28 2012-03-08 Osseofon Ab Transducteur miniaturisé à réluctance variable
US8150083B2 (en) 2008-03-31 2012-04-03 Cochlear Limited Piezoelectric bone conduction device having enhanced transducer stroke
US8363870B2 (en) 2005-02-21 2013-01-29 Cochlear Bone Anchored Solutions Ab Vibrator
US8620015B2 (en) 2007-05-24 2013-12-31 Cochlear Limited Vibrator for bone conducting hearing devices
US8837760B2 (en) 2009-03-25 2014-09-16 Cochlear Limited Bone conduction device having a multilayer piezoelectric element
US9107013B2 (en) 2011-04-01 2015-08-11 Cochlear Limited Hearing prosthesis with a piezoelectric actuator
US9716953B2 (en) 2013-03-15 2017-07-25 Cochlear Limited Electromagnetic transducer with specific internal geometry
US10178484B2 (en) 2011-03-16 2019-01-08 Cochlear Limited Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps
US11035830B2 (en) 2017-06-23 2021-06-15 Cochlear Limited Electromagnetic transducer with dual flux
USRE48797E1 (en) 2009-03-25 2021-10-26 Cochlear Limited Bone conduction device having a multilayer piezoelectric element
US11778385B2 (en) 2017-06-23 2023-10-03 Cochlear Limited Electromagnetic transducer with non-axial air gap

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6276511B2 (ja) * 2013-03-15 2018-02-07 リオン株式会社 電気機械変換器及び電気音響変換器

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5528697A (en) * 1991-05-17 1996-06-18 Namiki Precision Jewel Co., Ltd. Integrated vibrating and sound producing device
WO1997009858A1 (fr) * 1995-09-02 1997-03-13 New Transducers Limited Transducteurs de vibrations
SE514929C2 (sv) * 2000-06-02 2001-05-21 P & B Res Ab Vibrator för benförankrade samt benledningshörapparater
SE514930C2 (sv) * 2000-06-02 2001-05-21 P & B Res Ab Vibrator för benförankrade samt benledningshörapparater
US20030034039A1 (en) * 2001-08-14 2003-02-20 Schmid Christoph Hans Percutaneous or transcutaneous access into the body
US20030034705A1 (en) * 2000-03-09 2003-02-20 Bo Hakansson Electromagnetic vibrator
WO2003020360A1 (fr) * 2001-08-31 2003-03-13 Disetronic Licensing Ag Membrane, combinaison membrane et canule et dispositif de liaison

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5528697A (en) * 1991-05-17 1996-06-18 Namiki Precision Jewel Co., Ltd. Integrated vibrating and sound producing device
WO1997009858A1 (fr) * 1995-09-02 1997-03-13 New Transducers Limited Transducteurs de vibrations
US20030034705A1 (en) * 2000-03-09 2003-02-20 Bo Hakansson Electromagnetic vibrator
SE514929C2 (sv) * 2000-06-02 2001-05-21 P & B Res Ab Vibrator för benförankrade samt benledningshörapparater
SE514930C2 (sv) * 2000-06-02 2001-05-21 P & B Res Ab Vibrator för benförankrade samt benledningshörapparater
US20030034039A1 (en) * 2001-08-14 2003-02-20 Schmid Christoph Hans Percutaneous or transcutaneous access into the body
WO2003020360A1 (fr) * 2001-08-31 2003-03-13 Disetronic Licensing Ag Membrane, combinaison membrane et canule et dispositif de liaison

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7376237B2 (en) 2004-09-02 2008-05-20 Oticon A/S Vibrator for bone-conduction hearing
US8363870B2 (en) 2005-02-21 2013-01-29 Cochlear Bone Anchored Solutions Ab Vibrator
US7827671B2 (en) 2006-04-12 2010-11-09 Osseofon Ab Method for the manufacturing of balanced transducers
AU2007235700B2 (en) * 2006-04-12 2011-07-28 Osseofon Ab Method for the manufacturing of balanced transducers
WO2007117200A3 (fr) * 2006-04-12 2007-12-06 Osseofon Ab Procédé de fabrication de transducteurs équilibrés
US8620015B2 (en) 2007-05-24 2013-12-31 Cochlear Limited Vibrator for bone conducting hearing devices
US8150083B2 (en) 2008-03-31 2012-04-03 Cochlear Limited Piezoelectric bone conduction device having enhanced transducer stroke
WO2010110713A1 (fr) * 2009-03-24 2010-09-30 Osseofon Ab Transducteur à conduction osseuse à réponse haute fréquence améliorée
US8761416B2 (en) 2009-03-24 2014-06-24 Osseofon Ab Bone conduction transducer with improved high frequency response
USRE48797E1 (en) 2009-03-25 2021-10-26 Cochlear Limited Bone conduction device having a multilayer piezoelectric element
US8837760B2 (en) 2009-03-25 2014-09-16 Cochlear Limited Bone conduction device having a multilayer piezoelectric element
WO2012030270A1 (fr) * 2010-08-28 2012-03-08 Osseofon Ab Transducteur miniaturisé à réluctance variable
US9173040B2 (en) 2010-08-28 2015-10-27 Bo H{dot over (a)}kansson Miniaturized variable reluctance transducer
US10178484B2 (en) 2011-03-16 2019-01-08 Cochlear Limited Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps
US10979829B2 (en) 2011-03-16 2021-04-13 Cochlear Limited Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps
US11917376B2 (en) 2011-03-16 2024-02-27 Cochlear Limited Bone conduction device including a balanced electromagnetic actuator having radial and axial air gaps
US10142746B2 (en) 2011-04-01 2018-11-27 Cochlear Limited Hearing prosthesis with a piezoelectric actuator
US9107013B2 (en) 2011-04-01 2015-08-11 Cochlear Limited Hearing prosthesis with a piezoelectric actuator
US9716953B2 (en) 2013-03-15 2017-07-25 Cochlear Limited Electromagnetic transducer with specific internal geometry
US11026032B2 (en) 2013-03-15 2021-06-01 Cochlear Limited Electromagnetic transducer with specific internal geometry
US11035830B2 (en) 2017-06-23 2021-06-15 Cochlear Limited Electromagnetic transducer with dual flux
US11778385B2 (en) 2017-06-23 2023-10-03 Cochlear Limited Electromagnetic transducer with non-axial air gap

Also Published As

Publication number Publication date
SE0201441L (sv) 2003-11-11
SE0201441D0 (sv) 2002-05-10
EP1504630A1 (fr) 2005-02-09
AU2003235386A1 (en) 2003-11-11
JP2005525762A (ja) 2005-08-25
KR20050010791A (ko) 2005-01-28
SE522164C2 (sv) 2004-01-20

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