WO2020096356A1 - Transducteur de vibration à conduction osseuse - Google Patents

Transducteur de vibration à conduction osseuse Download PDF

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Publication number
WO2020096356A1
WO2020096356A1 PCT/KR2019/015006 KR2019015006W WO2020096356A1 WO 2020096356 A1 WO2020096356 A1 WO 2020096356A1 KR 2019015006 W KR2019015006 W KR 2019015006W WO 2020096356 A1 WO2020096356 A1 WO 2020096356A1
Authority
WO
WIPO (PCT)
Prior art keywords
bone conduction
ferromagnetic
coil
conduction vibration
vibration transducer
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.)
Ceased
Application number
PCT/KR2019/015006
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English (en)
Korean (ko)
Inventor
이규엽
성기웅
신동호
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.)
Kyungpook National University Hospital
Industry Academic Cooperation Foundation of KNU
Original Assignee
Kyungpook National University Hospital
Industry Academic Cooperation Foundation of KNU
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 Kyungpook National University Hospital, Industry Academic Cooperation Foundation of KNU filed Critical Kyungpook National University Hospital
Publication of WO2020096356A1 publication Critical patent/WO2020096356A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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; ELECTRIC HEARING AIDS; 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

Definitions

  • the present invention relates to a bone conduction vibration transducer. Specifically, it is an invention relating to the configuration of the magnetic circuit of the bone conduction vibration transducer.
  • Hearing aids that compensate for hearing loss in patients with hearing loss may be classified into an externally mounted type and an internally implanted type according to the user's hearing loss level and installation location.
  • the externally mounted type has the advantage that it can be simply mounted on the auricle of the outer ear, but has the disadvantage of not meeting the performance specifications required for highly deaf people. Therefore, for highly deaf people, an internal implantable hearing aid is suitable, which can be classified as an implantable artificial middle ear that replaces the middle ear or an implantable artificial inner ear that replaces the inner ear.
  • Implantable middle ear hearing aids typically include a microphone and a vibrating body, and research has been focused on the fact that a simple structure such as this can effectively deliver a voice signal to a highly deaf person.
  • the human ear is composed of the outer ear, middle ear, and inner ear, and external acoustic signals are sequentially transmitted along them.
  • Most implantable artificial middle ear hearing aids are being developed using this pathway as a method of applying vibration to the oval window of the cochlea.
  • the method of applying vibration in the garden window of the cochlea which is a reverse path, has been spotlighted.
  • the vibrating body of the implanted artificial middle ear hearing aid may be divided into an electromagnetic vibrating body including a permanent magnet and a coil, and a piezoelectric vibrating body including a piezoelectric element and an electrode.
  • the first considerations should be made of a small volume vibrating body and a low power consumption as much as possible for ease of surgery in addition to biosafety and suitability. For this, it is necessary to develop a high performance vibrating body.
  • the piezoelectric vibrating body has an advantage that the design cost is low, but it is difficult to implement a high-voltage output unit for operating the vibrating body while satisfying space constraints and conditions for minimizing power consumption.
  • the garden window driven vibration transducer using the electromagnetic vibrating body has a problem in that it is difficult to increase efficiency due to low driving force.
  • the present invention is intended to provide a configuration of a magnetic circuit for enhancing the energy efficiency of the implantable bone conduction vibration transducer.
  • the present invention is to maximize the driving force to improve the energy efficiency of the implantable bone conduction vibration transducer.
  • One example of a bone conduction vibration transducer is disclosed.
  • the bone conduction vibration transducer includes a permanent magnet; A first ferromagnetic body disposed to be connected to one end of the permanent magnet; A second ferromagnetic body disposed to be connected to the other end of the permanent magnet; And two coils wound to surround the first ferromagnetic body and the second ferromagnetic body, respectively.
  • the bone conduction vibration transducer may include a third ferromagnetic body which is spaced apart from the first ferromagnetic body and the second ferromagnetic body.
  • the directions of the windings in which the two coils are wound may be opposite to each other.
  • the distance between the first ferromagnetic body and the third ferromagnetic body may be spaced apart and the distance between the second ferromagnetic body and the third ferromagnetic body may be spaced apart from each other.
  • the number of windings of the two coils may be the same.
  • the first ferromagnetic body, the second ferromagnetic body and the housing for receiving the third ferromagnetic body may further include a.
  • the housing may be connected to at least one of the first ferromagnetic body, the second ferromagnetic body, and the third ferromagnetic body by an elastic body.
  • a bone conduction vibration transducer according to another embodiment of the present invention.
  • the bone conduction vibration transducer comprises a ferromagnetic assembly comprising a ferromagnetic portion and a coil portion constituting a magnetic closing circuit; And a permanent magnet disposed in the inner space of the ferromagnetic assembly.
  • the coil portion may include a first coil and a second coil wound around the first ferromagnetic body and the second ferromagnetic body connected to both ends of the permanent magnet among the ferromagnetic body portions.
  • the first coil and the second coil may be disposed at positions symmetrical with respect to the center of the permanent magnet.
  • FIG. 1 is a sectional view of a bone conduction vibration transducer using a conventional closed magnetic circuit.
  • Figure 2 shows a cross-sectional view of a bone conduction vibration transducer using a closed magnetic circuit according to the present invention.
  • FIG. 3 is a view showing the principle of the electromagnetic force of the bone conduction vibration transducer according to FIG. 2;
  • Figure 4 shows a specific cross-sectional view of a bone conduction vibration transducer using a closed magnetic circuit according to the present invention.
  • 5 is a graph showing the difference in electromagnetic force according to the deviation of the air gap in the closed magnetic circuit.
  • FIG. 6 is a graph showing the electromagnetic force of a transducer using a conventional closed magnetic circuit and a transducer according to the present invention.
  • FIG. 1 is a sectional view of a bone conduction vibration transducer using a conventional closed magnetic circuit.
  • a closed magnetic circuit composed of a permanent magnet 10 and a ferromagnetic body 20 is disclosed.
  • a coil is disposed in an air gap in the closed magnetic circuit, and the electromagnetic force generated by winding is used as a source of power.
  • an implantable bone conduction vibration transducer it must be driven by receiving power wirelessly. Because of these features, it was not possible to generate a high driving force through the conventional transducer method with low energy efficiency, and the function of the hearing aid was difficult to reproduce a high level of sound quality.
  • the present invention relates to a bone conduction vibration transducer, and more particularly, to a configuration of a magnetic circuit for enhancing energy efficiency in an implantable bone conduction vibration transducer in a magnetic closing circuit.
  • the present invention proposes a new structure in a bone conduction vibration transducer implanted in vivo.
  • the pores formed in the ferromagnetic body accommodating the permanent magnets are formed to be narrower, and they are formed into structures corresponding to the upper and lower ends.
  • the bone conduction vibration transducer it is possible to maximize a magnetic flux interlinked to a coil in a coil having the same number of windings through a structure in which a method of arranging the coils having the same number of windings is different. Through this, the driving force in the bone conduction vibration transducer can be maximized, and through this, the energy efficiency in the bone conduction vibration transducer can be improved.
  • a configuration of a magnetic circuit capable of maximizing the magnitude of a magnetic flux linking with a coil which is a source of power of an electromagnetic transducer. This configuration will be described in detail through the bone conduction vibration transducer according to the embodiment of FIG. 2.
  • Figure 2 shows a cross-sectional view of a bone conduction vibration transducer using a closed magnetic circuit according to the present invention.
  • a permanent magnet 100, a ferromagnetic body 200 and a coil may be included.
  • the difference between the configuration of the bone conduction vibration transducer according to FIG. 2 and the configuration of the bone conduction vibration transducer in FIG. 1 lies in the position in which the air gap is formed in the ferromagnetic material, the size of the air gap, and the number of coils.
  • the permanent magnet 100, the ferromagnetic body 200, and the coil may be included.
  • the permanent magnet 100 may be formed of a magnet having N and S poles.
  • the permanent magnet 100 may be designed in a cylindrical shape, but is not limited thereto, and may be designed and modified in various forms such as a rectangular parallelepiped or hexagonal pillar shape.
  • the permanent magnet 100 may be disposed at the center of the bone conduction vibration transducer.
  • the ferromagnetic material 200 may be arranged to receive the permanent magnet 100.
  • the ferromagnetic material 200 may be made of any one of iron, nickel, and cobalt.
  • the ferromagnetic material 200 is connected to both ends of the permanent magnet 100 and may be arranged to receive the permanent magnet 100.
  • the ferromagnetic body 200 may also serve as a vibrating body.
  • the ferromagnetic material 200 connected to both ends of the permanent magnet 100 may serve to receive vibration generated by the permanent magnet 100 and the coil.
  • the ferromagnetic material 200 may include a first ferromagnetic material 210, a second ferromagnetic material 220, and a third ferromagnetic material 230.
  • the ferromagnetic body 200 may be combined to form an interior space.
  • the ferromagnetic body 200 and the ferromagnetic body will be described in the same sense.
  • the coil part and the coil are described in the same meaning.
  • the ferromagnetic assembly may include a ferromagnetic portion and a coil portion.
  • the ferromagnetic portion and the coil portion included in the ferromagnetic assembly can be combined with each other to form a magnetic closing circuit.
  • the permanent magnet 100 may be disposed in the space inside the magnetic closing circuit.
  • the permanent magnet 100 may be disposed in an inner space formed by a combination of ferromagnetic assemblies.
  • One end of the permanent magnet 100 and the other end of the permanent magnet 100 may be connected to the ferromagnetic material 200.
  • a method in which one end of the permanent magnet 100 and the other end of the permanent magnet 100 are connected to the ferromagnetic material 200 may be connected through direct contact.
  • a method in which one end of the permanent magnet 100 and the other end of the permanent magnet 100 are connected to the ferromagnetic material 200 may be connected indirectly.
  • One end of the permanent magnet 100 and the other end of the permanent magnet 100 may be connected to the ferromagnetic body 200 through any other object.
  • the ferromagnetic material connected to the N pole of the permanent magnet 100 is referred to as a first ferromagnetic material 210 and the ferromagnetic material connected to the S pole of the permanent magnet 100 is referred to as a second ferromagnetic material 220 for description.
  • the ferromagnetic material that is not connected to the magnet 100 is referred to as a third ferromagnetic material 230.
  • the ferromagnetic body portion may include a first ferromagnetic body 210, a second ferromagnetic body 220 and a third ferromagnetic body 230.
  • the first ferromagnetic material 210 may be provided in the form of a circular plate. According to an example, the first ferromagnetic material 210 may be provided in the form of a rectangular plate.
  • the second ferromagnetic material 220 may be provided in a size and shape corresponding to the first ferromagnetic material 210.
  • the third ferromagnetic body 230 may be provided in a hollow shape.
  • the first ferromagnetic material 210 and the second ferromagnetic material 220 may be formed inside the hollow shape of the third ferromagnetic material 230.
  • the first ferromagnetic body 210 and the second ferromagnetic body 220 may be formed inside both ends of the hollow shape of the third ferromagnetic body 230.
  • first ferromagnetic body 210 and the third ferromagnetic body 230, the second ferromagnetic body 220 and the third ferromagnetic body 230 may be arranged to be spaced apart by a predetermined distance to form a void.
  • the bone conduction vibration transducer may further include a coil part disposed to surround the ferromagnetic bodies 210 and 220 connected to both ends of the permanent magnet 100.
  • the coil unit may include a first coil 310 and a second coil 320.
  • the coil disposed to surround the ferromagnetic material 210 connected to the N pole of the permanent magnet 100 is the first coil 310 and the ferromagnetic material 220 connected to the S pole of the permanent magnet 100.
  • the coil that is arranged to wrap around is called the second coil 320.
  • the first coil 310 may be disposed to surround the ferromagnetic body 210 connected to the N pole of the permanent magnet 100.
  • the second coil 320 may be disposed to surround the ferromagnetic body 220 connected to the S pole of the permanent magnet 100.
  • the first coil 310 may be disposed in an air gap formed by combining the first ferromagnetic material 210 and the third ferromagnetic material 230.
  • the second coil 320 may be disposed in the air gap formed by the combination of the second ferromagnetic material 220 and the third ferromagnetic material 230.
  • the first coil 310 and the second coil 320 may be disposed in each of the air gap formed in a portion adjacent to the portion connected to the N pole of the permanent magnet and the air gap formed in a portion adjacent to the portion connected to the S pole of the permanent magnet. Can be.
  • the first coil 310 and the second coil 320 disposed in each air gap may be provided with the same number of turns.
  • the size of the air gap in which the first coil 310 and the second coil 320 are respectively disposed may be the same.
  • the positions where the air gaps in which the first coil 310 and the second coil 320 are respectively disposed are formed may be formed at positions corresponding to each other.
  • the winding directions of the first coil 310 and the second coil 320 may be wound in opposite directions.
  • current may be applied in the same direction.
  • the size of the pores formed in the bone conduction vibration transducer according to FIG. 2 may be smaller.
  • the value of the number of turns of the first coil 310 and the second coil 320 included in the bone conduction vibration transducer according to FIG. 2 is the coil 30 in FIG. 1 It may be the same as the number of windings.
  • the loads of the electric drive end applied to each other may be the same.
  • the number of turns of the first coil 310 and the second coil 320 may be the same, and the positions to be arranged may be formed to correspond. Through this, the force received from the first ferromagnetic material and the force received from the second ferromagnetic material are the same, thereby minimizing distortion.
  • the bone conduction vibration transducer of FIG. 2 is manufactured using the same number of windings as the coil 30 according to the example of FIG. 1 corresponding to the existing invention, the first coil 310 and the second coil Dividing the number of windings by the same number in 320 can minimize the magnetoresistance.
  • the bone conduction vibration transducer it is possible to maximize efficiency and secure stability by making the number of windings of the first coil 310 and the second coil 320 the same.
  • the windings of the coils 30 included in the existing bone conduction vibration transducer are divided into two to separate and arrange the same number of winding coils into two narrower pores to space the gap. It can be provided to reduce.
  • the size of the magnetic field that bridges the wound coil can be further increased by narrowing the gap of the yoke made of a ferromagnetic material having the same electrical resistance. .
  • the circuit structure as described above it is possible to maximize the magnetic flux that is cross-linked to the coil and to improve the electromagnetic force caused by it.
  • a ferromagnetic material may be combined so that no other pores than the pores in which the coil is disposed are formed.
  • a gap other than the gap for the coil to be formed is formed, leakage of the magnetic flux may occur and the efficiency may decrease.
  • FIG. 3 is a view showing the principle of the electromagnetic force of the bone conduction vibration transducer according to FIG. 2;
  • FIG. 3 is a view for explaining the principle in a closed magnetic circuit according to the present invention.
  • 3 shows a case in which the coil is disposed as in the embodiment of FIG. 2.
  • the first coil 310 is in accordance with Fleming's left-hand law by the magnetic flux line B coming from the N pole of the permanent magnet 100 and the current flowing through the coils. Accordingly, the force F is applied in the direction shown in FIG. 3.
  • the second coil 320 receives the force F in the direction shown in FIG. 3 by the magnetic force line B entering the S pole of the permanent magnet 100 and the current flowing through the coils. That is, when the current directions of the first coil 310 and the second coil 320 are applied in different directions according to the distribution of the magnetic force line B by the permanent magnet 100, the coils always apply force in the same direction. Can be approved.
  • the winding direction of the first coil 310 and the second coil 320 may be changed so that a force is formed in a downward direction.
  • the magnetic circuit is a complete closed circuit, the leakage magnetic flux becomes 0, but since the coil must be wound, the magnetic circuit cannot be formed in the form of a complete closed circuit.
  • the magnetic resistance appears proportional to the third power of the air gap. As the magnetic resistance increases, the leakage magnetic flux increases.
  • the size of the air gap in FIG. 1 is 1 and the winding is divided by the air gap having a size of 0.5 as in FIG. 2, when the magnetoresistance in FIG. 1 is 1, the magnetic resistance in the first ferromagnetic material in FIG. 2 The magnetoresistance in the ferromagnetic body is 1/8 each. Therefore, the total magnetoresistance in FIG. 2 becomes 1/4, and as the magnetoresistance decreases, the leakage magnetic flux also decreases, thereby increasing the efficiency of the magnetic circuit.
  • the gap of the yoke made of a ferromagnetic material can be narrowed to further increase the size of the magnetic field that crosses the wound coil, thereby increasing the magnitude of electromagnetic force.
  • the position of the air gap in which the first coil 310 and the second coil 320 are disposed is in a direction in which the direction of the magnetic field generated in the permanent magnet 100 is perpendicular to the permanent magnet. Can be placed on.
  • Figure 4 shows a cross-sectional view of a specific embodiment of the bone conduction vibration transducer using a closed magnetic circuit according to the present invention.
  • the bone conduction vibration transducer may additionally include a housing 400 and an elastic body 500.
  • the housing 400 may be provided in a form including both a coil part, a ferromagnetic body 200, and a permanent magnet 100.
  • the ferromagnetic assembly may be accommodated in the housing 400.
  • the housing 400 may be formed of various materials.
  • the housing 400 may be formed of titanium or stainless steel, which is a biocompatible material for implantation.
  • the housing 400 may have a cylindrical or polygonal structure.
  • the elastic body 500 may serve to connect the housing 400 and the ferromagnetic body 200.
  • the elastic body 500 may be connected between the first ferromagnetic body 210 and the housing 400.
  • the elastic body 500 may be connected between the second ferromagnetic body 220 and the housing 400.
  • the elastic body 500 may be connected between the third ferromagnetic body 230 and the housing 400.
  • the elastic body 500 may be provided in plural.
  • the bone conduction vibration transducer may further include a power source for applying current to the coil.
  • FIG. 5 is a graph showing the difference in electromagnetic force according to the deviation of the air gap in the closed magnetic circuit. According to FIG. 5, it can be seen that the magnitude of the electromagnetic force formed according to the size of each pore varies.
  • the results according to FIG. 5 show the results of simulation by gradually narrowing each void.
  • the transducers subjected to the simulation in FIG. 5 have the largest pore size formed on the transducer 1, the size of the pores formed on the transducer 2 is between 1 and 3, and the pores formed on the transducer 3 are The smallest size.
  • the magnitude of the electromagnetic force formed by the transducer of 1 is 0.45T
  • the magnitude of the electromagnetic force formed by the transducer of 2 is 0.5T
  • the magnitude of the electromagnetic force formed by the transducer of 3 is 0.6T.
  • FIG. 6 is a graph showing the electromagnetic force of a transducer using a conventional closed magnetic circuit and a transducer according to the present invention.
  • the number 1 represents the electromagnetic force of the transducer according to one example in FIG. 1
  • the number 2 represents the electromagnetic force of the transducer according to one example in FIG. 2. According to FIG. 6, it can be confirmed that the electromagnetic force of the transducer according to the example in FIG. 2 is higher than that of 1.
  • the electromagnetic force of the transducer according to an example in FIG. 2 can obtain a magnetic field that is 7% higher than the electromagnetic force of the transducer according to an example in FIG. 1.
  • the electromagnetic force is higher when the size of the air gap is narrower and coils having different current directions are disposed at both ends than this.
  • the market of implantable hearing aids is rapidly growing, and technology mergers are actively progressing around global leading companies, so in the field of health care, broadly, implantable It has a feature that can be used in the field of hearing aids output devices or small vibration transducers that require high driving force.
  • the magnetic circuit included in the bone conduction vibration transducer according to the present invention can be formed to constitute a closed circuit to improve electromagnetic force.
  • the bone conduction vibration transducer according to an exemplary embodiment of the present invention may be formed in a flat shape to facilitate transplantation.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Prostheses (AREA)

Abstract

La présente invention concerne une structure de circuit magnétique d'un transducteur de vibration à conduction osseuse capable de maximiser la force d'entraînement. Le but de la présente invention est de diviser un enroulement en deux et de placer le même nombre de bobines d'enroulement dans deux pores plus étroits pour réduire l'espacement entre les pores, ce qui permet de maximiser le flux magnétique lié aux bobines et d'améliorer la force électromagnétique.
PCT/KR2019/015006 2018-11-06 2019-11-06 Transducteur de vibration à conduction osseuse Ceased WO2020096356A1 (fr)

Applications Claiming Priority (2)

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KR20180134891 2018-11-06
KR10-2018-0134891 2018-11-06

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WO2020096356A1 true WO2020096356A1 (fr) 2020-05-14

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PCT/KR2019/015006 Ceased WO2020096356A1 (fr) 2018-11-06 2019-11-06 Transducteur de vibration à conduction osseuse

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150373461A1 (en) * 2014-06-18 2015-12-24 Cochlear Limited Electromagnetic transducer with expanded magnetic flux functionality
KR20160004693A (ko) * 2014-07-04 2016-01-13 (주)테라다인 골전도 스피커
KR20160067344A (ko) * 2014-12-04 2016-06-14 이인호 초소형 복합 진동 마이크로스피커
KR101823228B1 (ko) * 2015-05-04 2018-01-29 최태광 자기흐름 제어장치
US20180255401A1 (en) * 2017-03-02 2018-09-06 Google Inc. Bone Conduction Transducer with a magnet anvil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100282066B1 (ko) * 1998-08-07 2001-09-29 조진호 중이 이식형 보청기의 트랜스듀서
KR101223693B1 (ko) * 2011-06-16 2013-01-21 경북대학교 산학협력단 구동력이 우수한 3코일 타입의 정원창 구동 진동체
KR101660715B1 (ko) 2015-06-09 2016-09-28 경북대학교 산학협력단 고정 기구를 구비한 벨로우즈 정원창 구동 진동체
KR102282417B1 (ko) * 2017-01-16 2021-07-27 주식회사 이어브릿지 에어 갭의 정밀도를 향상시킨 고품질 전자기 스피커

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150373461A1 (en) * 2014-06-18 2015-12-24 Cochlear Limited Electromagnetic transducer with expanded magnetic flux functionality
KR20160004693A (ko) * 2014-07-04 2016-01-13 (주)테라다인 골전도 스피커
KR20160067344A (ko) * 2014-12-04 2016-06-14 이인호 초소형 복합 진동 마이크로스피커
KR101823228B1 (ko) * 2015-05-04 2018-01-29 최태광 자기흐름 제어장치
US20180255401A1 (en) * 2017-03-02 2018-09-06 Google Inc. Bone Conduction Transducer with a magnet anvil

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KR102150086B1 (ko) 2020-09-02

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