WO2022153915A1 - Dispositif de conduction osseuse - Google Patents

Dispositif de conduction osseuse Download PDF

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Publication number
WO2022153915A1
WO2022153915A1 PCT/JP2022/000197 JP2022000197W WO2022153915A1 WO 2022153915 A1 WO2022153915 A1 WO 2022153915A1 JP 2022000197 W JP2022000197 W JP 2022000197W WO 2022153915 A1 WO2022153915 A1 WO 2022153915A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnet
coil
bone conduction
magnet unit
case
Prior art date
Application number
PCT/JP2022/000197
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English (en)
Japanese (ja)
Inventor
端明 謝
敏夫 中島
Original Assignee
ＢｏＣｏ株式会社
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 ＢｏＣｏ株式会社 filed Critical ＢｏＣｏ株式会社
Priority to JP2022500882A priority Critical patent/JP7382677B2/ja
Publication of WO2022153915A1 publication Critical patent/WO2022153915A1/fr

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    • 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
    • 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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details

Definitions

  • the present invention relates to a bone conduction device such as a bone conduction speaker and a bone conduction pickup.
  • listening devices such as headphones and earphones
  • listening devices include those using air conduction and those using bone conduction.
  • the sound source input as an electric signal is converted into the vibration of the air and transmitted to the eardrum to vibrate, and the vibration of the eardrum passes through the middle ear behind the ear and the sound information is sent to the brain. It uses a mechanism that is transmitted and recognized.
  • a hearing device using bone conduction converts an acoustic signal input as an electric signal into mechanical vibration, applies the vibration to the bone from an appropriate position, transmits the vibration to the bone, and transmits the vibration to the bone. Sound is recognized by conduction sound. Unlike headphones and earphones, this bone conduction hearing device does not need to be inserted into the ear canal and enters the ear without blocking the surrounding sound, so it is safe to wear. Is. In addition, since the vibration of the eardrum is not used, even a person with deafness can recognize the sound, and its use in hearing aids and the like is being promoted.
  • FIG. 4 is a schematic view showing a cross section of a general bone conduction speaker 101.
  • the yoke 109 is housed inside the case 111 whose upper surface is open, and the magnet 103 is housed inside the yoke 109. Further, coils 105 are arranged around the magnet 103 at intervals, and a vibrating member 107 is joined to the upper portion of the coil 105.
  • the vibrating member 107 is integrated with the coil 105 and vibrates with respect to the case 111 (for example, Patent Document 1).
  • the force generated in the axial direction of the coil 105 is proportional to the magnitude of the magnetic flux density penetrating the coil 105. Therefore, a stronger magnetic field is required to generate a larger force. However, there is a limit to the magnetic field generated from one magnet 103. Therefore, a method of increasing the magnetic flux density penetrating the coil more efficiently is desired.
  • the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a bone conduction device capable of efficiently generating vibration.
  • the present invention relates to a magnet unit, a coil arranged around the magnet unit, a case for accommodating the magnet unit and the coil, and the case.
  • a vibrating plate that is fixed and oscillated in the axial direction of the coil is provided, and the magnet unit includes a first magnet, a second magnet, the first magnet, and the second magnet.
  • a first yoke, which is arranged between magnets, is provided, and the first magnet and the second magnet are arranged apart from each other so that they have the same polarity facing each other, and are arranged via the vibrating plate.
  • the bone conduction device is characterized in that the coil and the magnet unit are relatively viable.
  • the first magnet and the second magnet are arranged apart from each other with the first yoke interposed therebetween so that the same polarities face each other, and the coil is arranged around the first yoke.
  • the magnetic flux density penetrating the coil can be increased as compared with the bone conduction speaker in which only one magnet is arranged.
  • vibration is efficiently generated. Can be made to.
  • the magnet unit is fixed to the case, the coil is connected to the diaphragm, a part of the coil is arranged on the outer periphery of the magnet unit, and the diaphragm and the coil are attached to the case. It may be vibrable.
  • the coil may be fixed to the case, the magnet unit may be joined to the diaphragm, and the diaphragm and the magnet unit may vibrate with respect to the case.
  • another magnet unit is arranged on the outer periphery of the coil at a position corresponding to the magnet unit, and the other magnet unit includes a third magnet arranged around the first magnet and the second magnet. It has a fourth magnet arranged around the magnet and a second yoke arranged between the third magnet and the fourth magnet, and has the third magnet and the fourth magnet.
  • the magnets have the opposite polarities to the first magnet and the second magnet, and may be spaced apart from each other so that they have the same polarity but face each other.
  • the magnetic flux density penetrating the coil can be further increased as compared with the bone conduction speaker in which the first magnet and the second magnet are arranged.
  • the figure which shows the cross section of the bone conduction device 1 The figure which shows the cross section of the bone conduction device 1a. The figure which shows the cross section of the bone conduction device 1b. The figure which shows the cross section of the bone conduction speaker 101.
  • FIG. 1 is a schematic view showing a cross section of the bone conduction device 1 according to the first embodiment of the present invention.
  • the bone conduction device 1 mainly includes a magnet unit 2, a coil 7, a case 9, a diaphragm 11, and the like.
  • the bone conduction device can also be used as the bone conduction pickup (mic).
  • the magnet unit 2 includes a magnet 3 which is a first magnet, a magnet 5 which is a second magnet, a yoke 13 which is a first yoke, and the like.
  • the magnet 3 and the magnet 5 are arranged apart from each other so that they have the same polarity and face each other.
  • the north poles are arranged so as to face each other.
  • the magnets 3 and 5 have, for example, a disk shape having substantially the same shape (having substantially the same magnetic force).
  • a yoke 13 is arranged between the magnet 3 and the magnet 5. That is, the magnet 3 and the magnet 5 are integrated by the yoke 13.
  • the yoke 13 has, for example, a ring shape, and is composed of at least an outer diameter equal to or larger than the outer diameter of the magnets 3 and 5.
  • Case 9 has a substantially cylindrical shape, for example, and one side is open.
  • the magnet unit 2, the coil 7, and the like are housed inside the case 9.
  • the diaphragm 11 is fixed to the opening surface of the case 9.
  • the coil 7 is arranged apart from the magnet unit 2 so as to cover at least a part around the magnet unit 2.
  • the diaphragm 11 can be elastically deformed and can vibrate in the axial direction of the coil 7.
  • the magnet unit 2 is fixed to the surface of the case 9 facing the diaphragm 11 (the side opposite to the opening surface).
  • a yoke 15 is connected to the diaphragm 11, and a coil 7 is connected to the yoke 15. That is, the coil 7 and the yoke 15 can vibrate with respect to the case 9.
  • the yoke 15 is formed, for example, in a cylindrical shape in which one is closed and the other is open.
  • the closed side of the yoke 15 is joined to the diaphragm 11.
  • the coil 7 is connected near the edge of the yoke 15 on the opening side, and the yoke 15 is arranged so as to cover the magnet 3 from above on the opening side.
  • the yoke 15 is made of a material (iron or the like) having a high magnetic permeability that allows magnetic flux to easily pass through, and exhibits a yoke function (formation of a magnetic circuit) and also functions as a mounting member for the coil 7 and the diaphragm 11. If the function as a mounting member for the coil 7 and the diaphragm 11 is sufficient without considering the yoke function, the same shape is formed by using a material having a low magnetic permeability such as aluminum instead of the yoke 15. It may be used as a coil mounting member.
  • a magnetic field is formed by the magnet unit 2 so as to penetrate the coil 7 as shown by an arrow. More specifically, assuming the magnetic field lines going from the N pole to the S pole, the N poles face each other, so the magnetic force lines generated from the N poles go outward (coil 7 side) so as to repel each other. Is formed. Then, the magnetic field lines pass through the coil 7 and further toward the respective S poles.
  • the magnetic field lines emitted from the N pole are not affected by other magnetic fields, so they form a certain extent of spread.
  • the spread of the magnetic field lines can be suppressed from each other, and the magnetic field lines can be rapidly formed in the direction of the coil 7. Therefore, the magnetic flux density penetrating the coil 7 can be increased.
  • the magnet unit 2 in which the magnet 3 and the magnet 5 are arranged so that the magnets 3 and the magnet 5 have the same polarity facing each other with the yoke 13 interposed therebetween is used, it is compared with the case where only one magnet is arranged. Therefore, the magnetic flux density penetrating the coil 7 can be increased. Therefore, vibration can be efficiently generated as compared with the case where one magnet having the same size as the magnet unit 2 is used.
  • FIG. 2 is a view showing a cross section of the bone conduction device 1a according to the second embodiment of the present invention.
  • the bone conduction device 1a is mainly different from the bone conduction device 1 of the first embodiment in that it further includes another magnet unit 16.
  • the magnet unit 16 is arranged on the outer circumference of the coil 7 at a position corresponding to the magnet unit 2.
  • the magnet unit 16 includes a magnet 17 which is a third magnet, a magnet 19 which is a fourth magnet, a yoke 21 which is a second yoke, and the like.
  • the magnets 17 and 19 have, for example, a ring shape having substantially the same shape (having substantially the same magnetic force).
  • the magnet 3 and the magnet 17 have substantially the same thickness. Further, the magnet 5 and the magnet 19 have substantially the same thickness. Further, the yoke 13 and the yoke 21 have substantially the same thickness. Therefore, the magnet 17 is arranged on the outer circumference of the magnet 3, the magnet 19 is arranged on the outer circumference of the magnet 5, and the yoke 21 is arranged on the outer circumference of the yoke 13.
  • the magnet 17 and the magnet 19 are arranged in directions having opposite polarities with respect to the magnet 3 and the magnet 5, respectively, and are separated from each other so that the same polarities face each other.
  • the magnet 3 and the magnet 5 are arranged so that the N poles face each other
  • the magnet 17 and the magnet 19 are arranged so that the S poles face each other.
  • a yoke 21 is arranged between the magnet 17 and the magnet 19. That is, the magnet 17 and the magnet 19 are integrated by the yoke 21.
  • the magnets 17, 19 and the yoke 21 are each substantially ring-shaped, and the magnet unit 2, the coil 7 and the yoke 15 are arranged inside the ring shape at a distance from the magnet unit 16.
  • the magnet unit 16 is fixed to the case 9 together with the magnet unit 2.
  • a magnetic field penetrating the coil 7 is formed by the magnet unit 2 and the magnet unit 16 as shown by arrows. At this time, as described above, by arranging the pair of magnets 3 and 5 having the same poles facing each other, the spread of the magnetic field lines can be suppressed from each other.
  • magnets 17 and 19 are arranged on the outer circumference of the magnets 3 and 5, and the north poles of the magnets 3 and 5 and the south poles of the magnets 17 and 19 are arranged so as to be adjacent to each other. Therefore, the magnetic field lines emitted from the north poles of the magnets 3 and 5 are formed toward the south poles of the magnets 17 and 19. Further, the magnetic field lines emitted from the north poles of the magnets 17 and 19 are formed toward the south poles of the magnets 3 and 5, respectively. By doing so, the magnetic field lines can be formed more rapidly in the direction of the coil 7 as compared with the case where only the magnet unit 2 is used. Therefore, the magnetic flux density penetrating the coil 7 can be further increased.
  • the same effect as that of the first embodiment can be obtained.
  • the magnet 17 and the magnet 19 have the opposite polarities to the magnet 3 and the magnet 5.
  • a magnet unit 16 is used which is arranged with the yoke 21 sandwiched so that the same polarities face each other. In this way, by adding the magnet unit 16, the magnetic flux density penetrating the coil 7 can be increased as compared with the case where only the magnet unit 2 is used, so that vibration can be generated more efficiently. ..
  • FIG. 3 is a view showing a cross section of the bone conduction device 1b according to the third embodiment of the present invention.
  • the bone conduction device 1b is mainly different from the bone conduction device 1a of the second embodiment in that the magnet unit 2 and the magnet unit 16 are joined to the diaphragm 11.
  • the coil 7 is fixed to the case 9. Further, the magnet unit 2 and the magnet unit 16 are integrated by a plate 23, and the plate 23 is joined to the diaphragm 11 via a fixing member 27.
  • the plate 25 is arranged on the surface of the magnet unit 2 and the magnet unit 16 opposite to the plate 23.
  • the plates 23 and 25 are arranged so as to sandwich the magnet unit 2 and the magnet unit 16, and also function as a yoke for forming a magnetic circuit.
  • the magnet unit 16 has a substantially ring shape as a whole, and the magnet unit 2 is arranged inside the magnet unit 16. Further, the coil 7 is arranged apart from each other between the magnet unit 2 and the magnet unit 16.
  • the bone conduction device 1b Similar to the bone conduction device 1a, the bone conduction device 1b also generates a force in the axial direction of the coil 7 according to Fleming's left-hand rule when a signal current is applied to the coil 7. Therefore, the coil 7 side and the magnet unit 2 and the magnet unit 16 side vibrate relatively. That is, the magnet units 2 and 16 and the diaphragm 11 vibrate with respect to the case 9.
  • the same effect as that of the second embodiment can be obtained. That is, as in the second embodiment, by adding the magnet unit 16, the magnetic flux density penetrating the coil 7 can be increased and vibration can be efficiently generated as compared with the case where only the magnet unit 2 is used. can.
  • the frequency characteristics were evaluated using a conventional product using one magnet (see FIG. 4) and an example in which magnets were arranged facing each other (see FIG. 3).
  • the frequency band showing a predetermined SN ratio was about 100 Hz to 20 kHz in the conventional product, whereas in the embodiment, the frequency showing the same SN ratio.
  • the band became about 40 Hz to 20 kHz, and the characteristics were particularly improved in the low frequency region.
  • the vibration gain of (see FIG. 3) increased by about 10 dB.
  • the polarity of the magnet may be opposite to the illustrated example.
  • other members may be added as appropriate as long as the effects of the present invention can be obtained.
  • the bone conduction device of the present invention can be used as a bone conduction pickup (microphone).
  • the operating principle of a general bone conduction device as a speaker application is that the coil is placed in a magnetic field generated from a magnet, the coil is vibrated by the Lorentz force generated by passing an electric current through the coil, and the vibration is transmitted through the bone. It is recognized as a transmitted sound to the auditory nerve.
  • the operating principle of the bone conduction device as a pickup is that the coil is placed in the magnetic field generated from the magnet, the coil and the magnet are vibrated, and the magnetic field applied to the coil changes to generate electromotive force by electromagnetic induction. Is generated.
  • vibration it was discovered that sufficient electromotive force can be obtained for vibration of 20 Hz to 20 KHz.
  • the bone conduction device according to the present invention can be used not only as a speaker function but also as a pickup function (microphone function).
  • this bone conduction device as a pickup function (microphone function) will be described in detail below.
  • the magnetic fields generated from the magnets 3, 5, 17, 19, and 103 of FIGS. 1, 2, and 3 are induced by the yokes 13, 15, 21, and 109 and are applied to the coils 7, 105.
  • the magnetic field applied to the coil changes and an electromotive force is generated by electromagnetic induction.
  • the magnet 3 and the yoke 13 are fixed to the case 9, and the coil 7 is fixed to the diaphragm.
  • the coil 7 is fixed to the case 9, and the magnet 3 and the yoke 13 are fixed to the diaphragm 11. Comparing the total weight of the coil 8 and the case 9 with the total weight of the magnet 3 and the yoke 13, the magnet 3 and the yoke 13 are made of metal and are heavy, so that the moment of inertia is large.
  • the pickup performance differs depending on whether the heavier side is contacted or the lighter side is contacted.

Abstract

Dispositif de conduction osseuse 1 comprenant principalement une unité d'aimant 2, une bobine 7, un boîtier 9, une plaque vibrante 11, et analogues. Le dispositif de conduction osseuse 1 est pourvu de l'unité d'aimant 2, de la bobine 7 qui est disposée autour de l'unité d'aimant 2, du boîtier 9 qui loge l'unité d'aimant 2 et la bobine 7, et de la plaque vibrante 11 qui est fixée au boîtier 9 et qui est disposée de façon à pouvoir vibrer dans la direction axiale de la bobine 9. Dans l'unité d'aimant 2, un premier aimant 3 et un second aimant 5 sont disposés séparément et de sorte que des polarités identiques se font face, et une première culasse 13 est disposée entre l'aimant 3 et l'aimant 5.
PCT/JP2022/000197 2021-01-18 2022-01-06 Dispositif de conduction osseuse WO2022153915A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2022500882A JP7382677B2 (ja) 2021-01-18 2022-01-06 骨伝導デバイス

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Application Number Priority Date Filing Date Title
JP2021005559 2021-01-18
JP2021-005559 2021-01-18

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WO2022153915A1 true WO2022153915A1 (fr) 2022-07-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61128894U (fr) * 1985-01-11 1986-08-12
KR20090082999A (ko) * 2008-01-29 2009-08-03 김성호 이중프레임 및 이중마그네트 구조의 골전도 스피커
WO2019134162A1 (fr) * 2018-01-08 2019-07-11 深圳市韶音科技有限公司 Haut-parleur à conduction osseuse

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000358296A (ja) 1999-06-16 2000-12-26 Sony Corp スピーカ及びスピーカ装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61128894U (fr) * 1985-01-11 1986-08-12
KR20090082999A (ko) * 2008-01-29 2009-08-03 김성호 이중프레임 및 이중마그네트 구조의 골전도 스피커
WO2019134162A1 (fr) * 2018-01-08 2019-07-11 深圳市韶音科技有限公司 Haut-parleur à conduction osseuse

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JP7382677B2 (ja) 2023-11-17
JPWO2022153915A1 (fr) 2022-07-21

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