EP1336320A1 - Vibrateur pour conduction osseuse - Google Patents

Vibrateur pour conduction osseuse

Info

Publication number
EP1336320A1
EP1336320A1 EP00958992A EP00958992A EP1336320A1 EP 1336320 A1 EP1336320 A1 EP 1336320A1 EP 00958992 A EP00958992 A EP 00958992A EP 00958992 A EP00958992 A EP 00958992A EP 1336320 A1 EP1336320 A1 EP 1336320A1
Authority
EP
European Patent Office
Prior art keywords
yoke
magnet
bone conduction
armature
frame
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.)
Withdrawn
Application number
EP00958992A
Other languages
German (de)
English (en)
Inventor
Sang-Chul Lee
Bon-Youn Koo
Yong-Mo Kim
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.)
Dowumi Corp
Original Assignee
Dowumi Corp
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 Dowumi Corp filed Critical Dowumi Corp
Publication of EP1336320A1 publication Critical patent/EP1336320A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • 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 vibrator, and more particularly, to a bone conduction vibrator in which a frequency band is widened and output efficiency is enhanced while its structure is simplified.
  • a sound which a person hears is a wave generated by a vibration of a substance.
  • a person can hear a sound from speakers of audio equipment, etc., because a person' s eardrum vibrates according to the soundwaves in the air.
  • the soundwaves pass through the person' s external ear, vibrate the eardrum, and are transmitted to the brain by cells of the internal ear being stimulated.
  • the general range of sound which the person can hear is from 20 to 20,000Hz, and that of the person's voice is from 500 to 2,000Hz. There are a lot of people who have difficulty in hearing a sound within the above range.
  • these audio listening devices can be applied to helmets which are used in a noisy site of construction, a market or during a state of emergency like extinguishing a fire.
  • FIG. ' 1 is a sectional view of a conventional bone conduction vibrator.
  • the conventional bone conduction vibrator 10 includes a cylindrical frame 11 and a base plate 12 which covers an opened bottom end of the frame 11.
  • a circular plate-shaped protector 13 is mounted at the top of the frame 11, and a vibrating part 14 which transmits the vibration to a user's body, e.g. a head, protrudes outside through an opening formed at the center portion of the protector 13.
  • a mastoid portion 15 which contacts directly the user' s head is formed at the top of the vibrating part 14.
  • a damper 16 for reducing the amplitude of vibration is provided between the top end of the frame 11 and the protector 13.
  • the vibrating part 14 passes through the center portion of the damper 16.
  • the yoke 17 includes a body 17a which supports the center portion of the damper 16 and an extended part 17b which is integrally formed downward along the periphery of the body 17a.
  • the vibrating part 14 is fitted tightly through the center portion of the body 17a of the yoke 17.
  • a magnet 18 is mounted within the extended part 17b of the yoke 17 while contacting the bottom surface of the body 17a.
  • An upper plate 19 for forming a magnetic circuit together with the magnet 18 and the yoke 17 is mounted under the magnet 18. The yoke 17, the magnet 18 and the upper plate 19 are bonded in contact with each other.
  • the vibration of the above magnetic circuit is limited to a certain extent by the damper 16 mounted on the yoke 17.
  • Such a vibration is transmitted to a user's head via the mastoid portion 15 of the vibrating part 14, to thereby enable the user to perceive sound signals by using bone conduction hearing.
  • the output efficiency must be enhanced and the frequency band be widened while simplifying the structure of the vibrator. But, it is difficult to satisfy this requirement. In other words, the sizes of the magnet and the yoke become necessarily large to enhance the output efficiency. This causes the enlargement of the overall size of the bone conduction vibrator. To the contrary, when making the vibrator small, the output efficiency is reduced. Therefore, it is very difficult to achieve the optimum conditions of the conventional bone conduction vibrator.
  • the present invention provides a bone conduction vibrator, comprising a frame which is formed in a hollow cylindrical shape having opened top and bottom ends; a base plate which is fitted into the opened bottom end of the frame; an armature which is fitted into the opened top end of the frame and • includes a rim portion and a diaphragm integrally formed with the rim portion while being stepped down along the inner periphery of the rim portion, the armature regulating a frequency band according to the size, thickness and material of the diaphragm; a yoke for concentrating a magnetic flux, which includes a body for supporting the armature and an extended part integrally formed downward along the periphery of the body; a magnet which is mounted within the extended part of the yoke such that an upper surface of the magnet contacts a lower surface of the body of the yoke; an upper plate which is mounted within the extended part of the yoke such that an upper surface of the upper plate contacts a lower surface of the magnet
  • the armature further includes a large diameter part extended downward from the center of the lower surface of the diaphragm, a small diameter part extended downward coaxially from the large diameter part, and a protrusion formed along the lower peripheral surface of the rim portion.
  • the frame is formed with a seat along the upper inner peripheral surface of the frame, on which the protrusion is seated.
  • a PCB terminal to which an electric current from an external power source is applied, is attached to a portion of the edge of the base plate, an end of a coil is soldered at the PCB terminal, and the other end of the coil is connected to the bottom of the voice coil.
  • the electric current is applied to the PCB terminal from the external power source and supplied to the voice coil via the coil, the upper plate, the magnet and the yoke vibrate integrally up and down by the attraction and repulsion of magnetic field formed by the upper plate, the magnet and the yoke, and the vibration is transmitted to a user' s body through the diaphragm of the armature or the base plate.
  • cushion members formed in a circular plate shape are bonded to the upper surface of the diaphragm of the armature and to the lower surface of the base plate, respectively, and contact directly the user's body.
  • the cushion members control the output of the vibrator according to the thickness.
  • FIG. 1 is a sectional view of a conventional bone conduction vibrator
  • FIG. 2 is an exploded perspective view of a bone conduction vibrator according to a preferred embodiment of the present invention.
  • FIG. 3 is a sectional view of a bone conduction vibrator according to a preferred embodiment of the present invention.
  • FIGs. 2 and 3 are an exploded perspective view and a sectional view of a bone conduction vibrator according to the present invention, respectively.
  • a bone-conduction vibrator As shown in the drawings, a bone-conduction vibrator
  • a frame 51 which is formed in a hollow cylindrical shape having opened top and bottom ends and defines a side wall of the vibrator
  • a PCB (Printed Circuit Board) terminal 53 to which an electric current from an external power source (not shown) is applied, is attached to a portion of the edge of the base plate 52, and an end of a coil 54 is soldered at the PCB terminal 53.
  • a hollow cylindrical-shaped voice coil 55 is adhered onto the base plate 52.
  • the coil 54 is extended into the frame 51 by passing through the base plate 52, and such an extended end of the coil 54 is connected to a lower end of the voice coil 55.
  • the voice coil 55 induces a change of a magnetic field from a sound signal electric energy.
  • An armature 56 including a rim portion 56a and a circular-shaped diaphragm 56b which is integrally formed with the rim portion 56a while being stepped down along the inner periphery of the rim portion 56a, is coupled to the opened top end of the frame 51.
  • a protrusion 56c for coupling the armature 56 to the frame 51 is formed along the lower peripheral surface of the rim portion 56a, and a seat 51a on which the protrusion 56c is seated is formed along the upper inner peripheral surface of the frame 51.
  • the protrusion 56c is glued onto the seat 51a.
  • a cylindrical large diameter part 56d is extended downward from the center of the lower surface of the armature 56, and a cylindrical small diameter part 56e is extended downward coaxially from the large diameter part 56d.
  • the shape, weight and hardness of the armature 56 determine the frequency band of the bone conduction vibrator 50 of the present invention.
  • the armature 56 is made from an aluminum or a stainless material.
  • a yoke 57 for concentrating a magnetic flux is provided inside the vibrator 50.
  • the yoke 57 includes a circular body 57a which contacts a stepped portion between the large and small diameter parts 56d and 56e for supporting the armature 56 and an extended part 57b which is integrally formed downward along the periphery of the body 57a.
  • a hole through which the small diameter part 56e of the armature 56 passes is formed at the center of the yoke body 57a, and the extended part 57b is disposed adjacently to the outer surface of the voice coil 55.
  • the yoke 57 is made by performing a cutting or forging operation for a pure iron having a low magnetic resistance.
  • a cylindrical magnet 58 is mounted within the extended part 57b of the yoke 57 such that the upper surface of the magnet 58 contacts the lower surface of the yoke body 57a.
  • the magnet 58 is formed with a thruhole at its center portion into which the small diameter part 56e of the armature 56 is inserted.
  • an upper plate 59 for forming a magnetic circuit together with the magnet 58 and the yoke 57 is mounted under the magnet 58 while contacting the magnet 58 and being located within the voice coil 55. That is, the voice coil 55 is located in a gap G formed between the upper plate 59 and the extended part 57b of the yoke 57.
  • the armature 56, yoke 57, magnet 58 and upper plate 59 are bonded together by means of an adhesive agent, etc.
  • Cushion members 60a and 60b formed in a circular plate shape are bonded to the upper surface of the diaphragm 5 ⁇ b of the armature 56 and to the lower surface of the base plate 52, respectively.
  • the cushion members 60a and 60b are preferably made from materials having a high specific gravity and a good shock-absorbing efficiency. Such cushion members 60a and 60b contact directly a human body, especially a head, and control the vibrating characteristics of the vibrator 50. Specially, the output of the vibrator 50 varies according to the thicknesses of the cushion members 60a and 60b.
  • the voice coil 55 When an electric current is applied to the PCB terminal 53 from an external power source, the electric current is supplied to the voice coil 55 via the coil 54. Then, the voice coil 55 induces a change of a magnetic field from a sound signal electric energy.
  • Such a vibration is transmitted to a user's head through the cushion member 60a bonded to the diaphragm 56b of the armature 56 or the cushion member 60b bonded to the base plate 52, so that the user can perceive sound signals by using bone conduction hearing.
  • the frequency characteristic of the inventive bone conduction vibrator 50 will be described hereinafter in comparison with that of the conventional bone conduction vibrator 10 (see FIG. 1).
  • the vibration generated from the diaphragm 56b of the armature 56 is defined as a forward vibration
  • the vibration generated from the base plate 52 is defined as a backward vibration
  • the forward vibration Upon comparing the frequency band of the forward vibration with that of the backward vibration under the same conditions, the forward vibration has the frequency band of about 150 to 15,000Hz, and the backward vibration has the frequency band of about 120 to 18,000Hz.
  • the bone conduction vibrator 50 can be adequately applied to products such that the vibration of the base plate 52 is applied to a product requiring a relatively broad frequency band, while the vibration of the armature 56 is applied to a product requiring a relatively narrow frequency band.
  • the conventional vibrator 10 has the same magnetic circuit (that is, the upper plate, the magnet and the yoke) in size and material and has the same voice coil in winding number that the inventive vibrator 50 has, the conventional vibrator 10 has the frequency band of about 260 to 2,000Hz, which is considerably narrower than that of the inventive vibrator 50 .
  • the maximum output of the above- described backward vibration of the inventive vibrator 50 shows higher than that of the conventional vibrator 10 by about lOdB or more.
  • the frequency band and the output of the inventive bone conduction vibrator 50 depend upon the armature 56 and the cushion members 60a and 60b.
  • the frequency band and the output are controlled adequately for the products to which the inventive bone conduction vibrator 50 is applied.
  • the bone conduction vibrator of the present invention has the different frequency characteristics between the vibrations in the forward direction (i . e . , the diaphragm of the armature) and the backward direction (i . e. , the base plate).
  • the forward direction i . e .
  • the backward direction i . e. , the base plate.
  • the inventive vibrator has a wider frequency band and more enhanced output efficiency.
  • the frequency band and the output are easily adjusted while reducing the overall size of the vibrator.

Abstract

L'invention concerne un vibrateur pour conduction osseuse, comprenant une structure formée dans un cylindre creux. Une plaque de base est fixée dans une extrémité inférieure ouverte de ladite structure. Un induit est fixé dans l'extrémité supérieure ouverte de la structure et comprend une partie bord ainsi qu'une membrane qui forme une seule pièce avec cette dernière et présente un décrochement vers le bas, le long de la périphérie interne de la partie bord. Une culasse comprend un corps servant à soutenir l'induit, ainsi qu'une partie allongée, d'un seul tenant, orientée vers le bas, le long de la périphérie du corps. Un aimant est monté dans la partie allongée de la culasse et vient en contact avec le corps de cette dernière. Une plaque supérieure est montée à l'intérieur de la partie allongée et vient en contact avec l'aimant. Une bobine mobile est située dans un entrefer, formé entre la plaque supérieure et la partie allongée de la culasse, et adhère à la plaque de base.
EP00958992A 2000-09-01 2000-09-01 Vibrateur pour conduction osseuse Withdrawn EP1336320A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2000/000991 WO2002019759A1 (fr) 2000-09-01 2000-09-01 Vibrateur pour conduction osseuse

Publications (1)

Publication Number Publication Date
EP1336320A1 true EP1336320A1 (fr) 2003-08-20

Family

ID=19198264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958992A Withdrawn EP1336320A1 (fr) 2000-09-01 2000-09-01 Vibrateur pour conduction osseuse

Country Status (5)

Country Link
EP (1) EP1336320A1 (fr)
JP (1) JP2004507951A (fr)
CN (1) CN1454443A (fr)
AU (1) AU2000270392A1 (fr)
WO (1) WO2002019759A1 (fr)

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US7512425B2 (en) * 2004-01-16 2009-03-31 Temco Japan Co., Ltd. Portable telephone using bone conduction device
JP4631070B2 (ja) * 2005-05-23 2011-02-16 並木精密宝石株式会社 骨伝導スピーカ
JP4709017B2 (ja) 2006-01-12 2011-06-22 ソニー株式会社 イヤホン装置
WO2008003235A1 (fr) * 2006-06-28 2008-01-10 Qiang Hu Dispositif de transmission et de réception bidirectionnel audio reposant sur la détection osseuse
JP4952211B2 (ja) * 2006-11-22 2012-06-13 コスモギア株式会社 骨伝導イヤホン
US20100246861A1 (en) * 2007-05-15 2010-09-30 Han Sung-Moon Small-sized sound receiver for producing body-sensing vibration
US8107648B2 (en) 2008-06-05 2012-01-31 Cosmogear Co., Ltd. Bone conduction earphone
CN101854576B (zh) * 2010-06-23 2011-11-16 深圳市特灵通数码通讯发展有限公司 一种双膜、双传导的多声道耳机
CN101931837A (zh) * 2010-08-06 2010-12-29 深圳市雷富溢电子科技有限公司 一种骨传导和空气传导振子及其耳机
CN102014328A (zh) * 2010-12-24 2011-04-13 金在善 骨传导耳机
JP5625928B2 (ja) * 2011-01-13 2014-11-19 日本放送協会 テレビ番組出演用イヤホン
JP2012249097A (ja) * 2011-05-27 2012-12-13 Kyocera Corp 音声出力装置
US11540057B2 (en) 2011-12-23 2022-12-27 Shenzhen Shokz Co., Ltd. Bone conduction speaker and compound vibration device thereof
US11665482B2 (en) 2011-12-23 2023-05-30 Shenzhen Shokz Co., Ltd. Bone conduction speaker and compound vibration device thereof
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Also Published As

Publication number Publication date
JP2004507951A (ja) 2004-03-11
WO2002019759A1 (fr) 2002-03-07
CN1454443A (zh) 2003-11-05
AU2000270392A1 (en) 2002-03-13

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