WO2011021745A1 - 다기능 마이크로 스피커 - Google Patents

다기능 마이크로 스피커 Download PDF

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Publication number
WO2011021745A1
WO2011021745A1 PCT/KR2009/006438 KR2009006438W WO2011021745A1 WO 2011021745 A1 WO2011021745 A1 WO 2011021745A1 KR 2009006438 W KR2009006438 W KR 2009006438W WO 2011021745 A1 WO2011021745 A1 WO 2011021745A1
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WO
WIPO (PCT)
Prior art keywords
suspension
yoke
permanent magnet
fixed
boss portion
Prior art date
Application number
PCT/KR2009/006438
Other languages
English (en)
French (fr)
Korean (ko)
Inventor
권철영
이상호
장홍규
Original Assignee
주식회사 비에스이
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 주식회사 비에스이 filed Critical 주식회사 비에스이
Publication of WO2011021745A1 publication Critical patent/WO2011021745A1/ko

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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
    • 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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering
    • H04R9/043—Inner suspension or damper, e.g. spider
    • 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
    • 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
    • H04R2400/00—Loudspeakers
    • H04R2400/03—Transducers capable of generating both sound as well as tactile vibration, e.g. as used in cellular phones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/07—Suspension between moving magnetic core and housing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the present invention relates to a multifunctional micro speaker, and more particularly, to a multifunctional micro speaker capable of improving the assembling accuracy between yokes, magnets, and plates constituting a magnetic circuit.
  • a speaker is a device that converts an electrical signal into a voice signal.
  • Micro-speakers are mainly small speakers for small sized audio equipment such as mobile phones, laptops, MP3 players, earphones, etc., and portable audio equipment that is in great demand in recent years.
  • vibration signal is used as a signal in place of an incoming call signal or as a signal for confirming an input state in a touch screen method of directly inputting information on a screen.
  • the multifunctional micro speaker of the present invention refers to a speaker having not only a basic function of generating sound but also a configuration for generating a vibration signal.
  • the multifunctional micro speaker is variously called a multifunctional actuator or a multifunctional electro-acoustic transducer.
  • the multifunctional micro-speaker of the conventional structure is a structure which acquires a vibration by resonating the vibrating body supported by the plate-shaped spring.
  • Such a conventional multifunctional micro speaker has a voice coil in a magnetic circuit on the side of a diaphragm, also called a vibration plate, which generates sound when a current for a voice signal is applied, and generates vibration when a current for a vibration signal is applied to the voice coil.
  • the system is adopted.
  • the conventional multifunctional micro speaker 100 includes a case 110, a vibration generating plate 101 for sound generation, a voice coil 102, a permanent magnet 104 and a plate 103 in which an N pole and an S pole are disposed in an up and down direction. And a yoke 105, an upper suspension 107, and a lower suspension 108. Current is applied to the voice coil 102 via the lead line a 114 and the lead line b 115.
  • the upper end of the voice coil 102 is fixed to the lower surface of the diaphragm 101, and the voice coil 102 is wound in the vertical direction.
  • the plate 103 is fixed to the upper surface of the permanent magnet 104.
  • the permanent magnet 104 forms a speaker magnetic circuit together with the plate 103 and the yoke 105 and constitutes a vibrating body. Weight may be added to the vibrating body as needed.
  • the vibrating body is elastically supported by the case 110 by the upper suspension 107 and the lower suspension 108.
  • the operation of the multifunctional micro speaker 100 having such a configuration will be described.
  • a current suitable for sound is applied to the voice coil 102 through the lead wire a 114 and the lead wire b 115, electromagnetic force is generated in the voice coil 102, which causes the diaphragm 101 to vibrate. Sound output is made.
  • the magnetic force lines from the N pole of the permanent magnet 104 form a magnetic field that passes through the plate 103, the voice coil 102, and the yoke 105 in turn to the S pole of the permanent magnet 104.
  • the electromagnetic force is generated in the voice coil 102, it interacts with the magnetic flux by the magnetic circuit, and the diaphragm 101 fixed to the voice coil 104 is vibrated to function as a speaker for outputting sound.
  • the voice coil vibrates while being located in the magnetic gap, which is the space between the plate and the yoke, and also because the vibrating body must also vibrate without physical contact with the voice coil, the yoke, the magnet and the plate are precisely coupled to the intended mutual position The need to be fixed must be satisfied.
  • An object of the present invention is to solve the above-described problems, and to provide a multifunctional micro speaker that improves the formation of a suspension and enables precise mechanical coupling between components forming a vibrating body.
  • the multi-function micro speaker of the present invention comprises: a frame: a diaphragm fixed to an outer circumference of the frame; A voice coil fixed to the lower surface of the diaphragm; A first suspension having an outer circumferential portion fixed to the frame and having a plate shape and elasticity; A yoke fixed to the first suspension; A first permanent magnet fixed to the inner bottom surface of the yoke; And a plate fixed to an upper surface of the permanent magnet, wherein a central portion of the first suspension is provided with a boss protruding upward, and the yoke accommodates a yoke to which the boss of the first suspension is coupled. Characterized in that the groove is provided.
  • the permanent magnet is preferably provided with a permanent magnet receiving groove coupled to the boss portion of the first suspension penetrating the yoke receiving groove.
  • the permanent magnet receiving groove may penetrate through the boss of the first suspension, and the plate may include a plate receiving groove to which the boss of the first suspension penetrating the permanent magnet receiving groove is coupled.
  • At least a portion of the upper end of the boss portion of the first suspension is preferably provided with a bent portion.
  • the first suspension is a metal
  • the boss portion is a hollow cylindrical shape.
  • the outer peripheral portion is fixed to the frame, and fixed to the second suspension and the second suspension having elasticity, the first suspension and the yoke spaced apart from the yoke It is preferable that the structure further includes two magnets.
  • a second suspension boss portion protruding downward is provided at a center portion of the second suspension, and the second magnet is provided below the second suspension, and the second suspension boss portion is coupled to the second magnet. It is preferable that the second magnet receiving groove is provided.
  • a second suspension boss portion protruding upwardly is provided at the center of the second suspension, the second magnet is provided on the second suspension, and the second magnet is coupled to the second suspension boss portion. It is preferable that a magnet receiving groove is provided.
  • the multi-function micro speaker it is possible to obtain the effect that the precise mechanical coupling between the components constituting the suspension and the magnetic circuit portion is possible.
  • the coupling between the components constituting the suspension and the magnetic circuit portion can be achieved quickly by a simple process.
  • FIG. 1 is a schematic cross-sectional view of a conventional multifunctional micro speaker
  • FIG. 2 is a schematic cross-sectional view of a multifunctional micro speaker of one embodiment according to the present invention.
  • 3 to 6 are schematic cross-sectional views of modified embodiments of suspension, yoke, permanent magnet and plate configurations, respectively, of the configuration of the multifunction micro speaker of FIG.
  • the multifunction micro speaker of one embodiment according to the present invention will be described in detail with reference to FIGS. 2 to 4.
  • FIG. 2 is a schematic cross-sectional view of a multifunction micro speaker of an embodiment according to the present invention
  • FIG. 3 is a cross-sectional view illustrating only the first suspension, the yoke, the first permanent magnet and the plate of FIG. 2.
  • the multifunctional micro speaker 1 of this embodiment is mainly used in a mobile communication terminal such as a mobile phone and a small device such as a PMP, and has a sound generating function and a vibration generating function as a signal at the same time.
  • the multifunction micro speaker 1 includes a frame 10, a diaphragm 20, a voice coil 30, a first suspension 40, a yoke 50, and a first permanent magnet 60.
  • the plate 70, the second suspension 80 and the second magnet 90 is made up.
  • the frame 10 is usually made of plastic, forms the external shape of the speaker, and various components are fixed therein.
  • the frame 10 includes an upper frame 12 and a lower frame 14.
  • the cover member 14 is coupled to the upper portion of the upper frame 12.
  • the frame 10 is generally cylindrical in shape.
  • the outline of the cross section of the frame may be rectangular, elliptical or track shape.
  • the internal parts can also be modified as appropriate to their external shape.
  • the outer circumferential portion of the diaphragm 20 is fixed to the upper portion of the upper frame 12.
  • the diaphragm 20 is circular and is usually made of a high molecular compound.
  • the diaphragm 20 vibrates up and down to produce a sound pressure that can be heard by a person.
  • the diaphragm 20 of this embodiment is divided into an inner part located inward and an outer part located outward based on the boundary portion where the upper end of the voice coil 30 is coupled.
  • the inner part and the outer part are each dome-shaped, and the boundary part is flat.
  • the outer part is also called the edge.
  • the diaphragm can vary in specific shapes, materials, and thicknesses.
  • the voice coil 30 is fixed to the lower surface of the diaphragm 20.
  • the upper end of the voice coil 30 is fixed to the lower surface of the boundary of the diaphragm 20.
  • the voice coil 30 is formed by winding a conductive wire in an upward direction.
  • the voice coil 30 is electrically connected to a terminal (not shown) provided in the frame.
  • the voice coil 30 is supplied with current from the outside via a terminal.
  • the lower portion of the voice coil 30 is located in the space between the permanent magnet 60 and the plate 70 coupled to the vertical direction, and the yoke 50. This space is called a magnetic gap.
  • a high-frequency current for the acoustic signal flows through the voice coil 30, the magnetic coil is moved upward and downward due to a mutual relationship with a magnetic field generated by the first permanent magnet 60. As a result, the diaphragm 20 coupled to the voice coil 30 vibrates to generate sound.
  • the first suspension 40 includes a boss portion 42.
  • the first suspension 40 is elastic and its outer circumferential portion is fixed to the frame 10.
  • the suspension may be referred to as an elastic member, a spring or a plate spring.
  • the elasticity refers to the property of changing the volume and shape when an external force is applied to the object and then returning to the shape of Bondi when the force is removed.
  • the elasticity is divided into volume elasticity and shape elasticity according to the type of deformation.
  • the first suspension 40 is mainly related to shape elasticity.
  • the first suspension 40 is plate-shaped and disc-shaped so as to correspond to the shape of the frame.
  • the first suspension 40 is made of a metal plate such as phosphor bronze.
  • the first suspension may be made of a polymer elastic material.
  • the yoke 50 is fixed to the center portion of the first suspension 40.
  • the boss portion 42 is provided to protrude upward from the center portion of the first suspension 40.
  • the boss part 42 is easy to manufacture by various metal processing processes including press working.
  • the boss portion 42 has a hollow cylindrical shape in this embodiment. That is, the transverse cross section of the boss portion 42 is a hollow circle.
  • the boss portion in addition to the cylindrical shape, may be a columnar shape of various shapes such as triangles, squares, pentagons, ellipses, etc., the cross section is various, the interior of the boss portion may be empty or filled.
  • the boss portion when the first suspension is made of a polymer elastic material other than metal as in the case of the present embodiment, the boss portion is also made of the same material as the suspension.
  • the height of the boss portion 42 corresponds to the thickness of the receiving groove of the yoke 50.
  • the thickness of the boss portion 42 is slightly smaller than the thickness of the yoke 50.
  • the yoke 50 is fixed to the upper surface of the first suspension 40.
  • the yoke 50 includes a flat bottom portion 54 and a wall portion 56 formed in a vertical direction surrounding the outer circumferential portion of the bottom portion.
  • the first permanent magnet 60 is coupled to the bottom portion 54 of the yoke.
  • a yoke receiving groove 52 At the center of the bottom portion 54 of the yoke is provided a yoke receiving groove 52 to which the boss portion 42 of the first suspension 40 located below the yoke is engaged.
  • the yoke receiving groove 52 is provided in the boss portion 42 in a shape corresponding to the shape so that the boss portion 42 can be coupled.
  • the yoke receiving groove 52 is also cylindrical to correspond thereto.
  • the size of the diameter of the yoke receiving groove 52 is slightly larger than the size of the outer diameter of the boss portion 42 so that a firm coupling is achieved even if the boss portion 42 is fitted into the yoke receiving groove without any adhesive. It is preferable to be comprised large.
  • an adhesive may be used between the boss portion 42 and the yoke receiving groove 52.
  • the first permanent magnet 60 is fixed to the inner bottom surface of the yoke 50.
  • the first permanent magnet 60 is fixed to the bottom portion 54 of the yoke by a method such as an adhesive so as to be concentric with the yoke 50.
  • the first permanent magnet 60 is formed in the shape of a disc so as to correspond to the shape of the yoke 50.
  • the plate 70 is fixed to an upper surface of the first permanent magnet 60.
  • the plate 70 is made of a material that allows magnetic force to pass through, and has a diameter substantially the same as that of the first permanent magnet 60.
  • the first permanent magnet 60 and the plate 70 are fixed to be spaced apart from the wall of the yoke 50.
  • a space is formed between the outer surfaces of the first permanent magnet 60 and the plate 70 facing each other and the inner surface of the wall portion of the yoke 50, and the lower portion of the voice coil 30 is located in the space. .
  • the first permanent magnet 60, the plate 70, and the yoke 50 constitute a speaker magnetic circuit. That is, the magnetic flux generated in the permanent magnet 60 creates a magnetic flux path (path) entering the yoke 50 via the plate 70.
  • the second suspension 80 and the second magnet 90 are further provided.
  • the second suspension 80 is spaced downward from the first suspension 40.
  • the outer periphery of the second suspension 80 is fixed to the frame 10 and is made of an elastic material.
  • the second suspension 80 is made of the same shape and material as the first suspension 40.
  • the shape and material of the first suspension 40 and the second suspension 80 may not be the same, and may be variously changed in consideration of resonance frequency, displacement, and vibration force.
  • the second magnet 90 is fixed to the lower surface of the second suspension 80. Thus, the second magnet 90 is spaced apart from the first suspension 40 and the yoke 50.
  • the polarity of the second magnet in the vertical direction may be arranged as S and N poles from the top to the bottom as needed, and may be arranged as the N and S poles from the top to the bottom.
  • the second magnet may be a permanent magnet or an electromagnet.
  • the second magnet 90 and the second suspension 80 is configured to serve as a vibrator for generating a vibration signal.
  • a vibrator composed of a second magnet 90 and a second suspension 80 includes a magnetic circuit composed of a first permanent magnet 60, a plate 70, and a yoke 50. Although spaced apart from each other, the magnetic circuit and the vibrator are connected to each other by a magnetic field, so that the vibration movement of the diaphragm 20 for sound generation and the vibration of the vibrator made of the second magnet 90 and the second suspension 80. Mutual interference of movements is minimized.
  • the multifunction micro speaker 1 of this embodiment is provided with the boss part 42 in the 1st suspension 40, and is provided with the yoke accommodation groove 52 of the shape corresponding to the boss part 42, The advantage is that it is possible to be precisely coupled to the desired position with each other.
  • the second suspension and the second magnet is provided as an example, but the present invention is not limited to this embodiment.
  • the multifunctional micro speaker having only one suspension and one permanent magnet it is applicable to combining the suspension and the permanent magnet.
  • FIG. 4 in the multi-function micro speaker of another embodiment according to the present invention, only the configurations of the suspension, the yoke, the permanent magnet and the plate are illustrated as cross-sectional views.
  • the yoke receiving groove 52 penetrates the boss portion 42 of the first suspension 40 upward.
  • the permanent magnet 60 is provided with a permanent magnet accommodating groove 62 to which the boss portion 42 of the first suspension 40 penetrates through the yoke accommodating groove 52.
  • the boss portion 42 of the suspension 40 penetrates through the yoke receiving groove 52 of the yoke 50 and is coupled to the permanent magnet receiving groove 62 of the permanent magnet 60.
  • the plate 70 is coupled to the upper surface of the permanent magnet 60.
  • This embodiment has the advantage that the suspension 400, the yoke 50, and the permanent magnet 60 can be precisely coupled to each other by the boss portion 42 of the suspension.
  • the advantages are all appropriately modified in the case of the present embodiment.
  • Fig. 5 in the multi-function micro speaker of another embodiment according to the present invention, it is illustrated as a cross-sectional view that only the components of the suspension, yoke, permanent magnet and plate are coupled to each other.
  • the yoke receiving groove 52 penetrates through the boss portion 42 of the first suspension 40 upwards, and the permanent magnet receiving groove 62 of the permanent magnet 60 also includes the first suspension 40 of the first suspension 40. It is configured to penetrate the boss portion 42.
  • the plate 70 is provided with a plate receiving groove 72 to which the boss portion 42 of the first suspension penetrates the permanent magnet receiving groove 62.
  • the plate receiving groove 72 may have a cylindrical shape that can penetrate the boss portion 42 as in the case of the present embodiment. Alternatively, only a portion of the upper end portion of the boss portion 42 does not penetrate the boss portion 42. It may also be in the form of a groove having a constant depth to be combined.
  • the boss portion 42 of the suspension 40 penetrates through the yoke receiving groove 52 of the yoke 50 and the permanent magnet receiving groove 62 of the permanent magnet 60, and receives the receiving groove 720 of the plate 70. Is coupled to
  • the upper end of the boss portion 42 may be open or may be sealed.
  • the portion of the suspension 40 below the boss portion 42 may also be open or sealed.
  • all components of the suspension 40, the yoke 50, the permanent magnet 60, and the plate 70 are controlled by a simple process without a bonding process or a jig by the boss portion 42 of the suspension.
  • the advantage is that they can be combined with each other precisely.
  • all the advantages described in the first embodiment are appropriately modified and applied in the case of the present embodiment.
  • FIG. 6 illustrates an embodiment in which the upper end of the boss of the embodiment illustrated in FIG. 5 is modified.
  • a bent portion 44 that is bent is provided at the upper end of the boss portion 42 of the first suspension 40.
  • the bent portion 44 is the entire upper edge of the boss portion is bent. However, in another embodiment, only a part of the upper edge of the boss portion may be bent.
  • the configuration of the suspension, yoke, permanent magnet and plate can be mutually pressurized and securely combined can be obtained.
  • the bent portion 44 of the upper end of the boss portion 42 for example, after inserting the cylindrical boss portion 42 through the yoke, the permanent magnet and the plate, the upper end portion of the boss portion located higher than the upper surface of the plate It is formed by bending in the outward direction to contact the upper surface of the plate.
  • the bent portion 44 is preferably formed by bending the upper end of the boss portion so that a firm bond between the yoke, the permanent magnet and the mountains of the plates can be maintained.
  • Both or at least one of the upper and lower ends of the boss portion 42 may be sealed or opened.
  • Fig. 7 shows a multifunctional micro speaker of yet another embodiment according to the present invention.
  • the multifunction micro speaker 1a of the present embodiment has the yoke 50 having the boss portion 42 of the first suspension 40 as shown in FIG. 6.
  • the bent portion 44 penetrates the upper end of the permanent magnet 60 and the plate 70, and the second suspension 80 is also characterized in that the boss portion 82 is provided.
  • a second suspension boss portion 82 protruding downward is provided at the center of the second suspension 80.
  • the second magnet 90 is provided below the second suspension 80, and the second magnet 90 is provided with a second magnet receiving groove 92 to which the second suspension boss portion 82 is coupled. have.
  • a bend portion 84 is provided at the lower end of the second suspension boss portion 82.
  • the second suspension boss portion 82 is provided in the second suspension 80, and the second magnet 90 is provided in the second magnet 90 so as to correspond thereto, the mutual coupling is precisely performed. It is possible.
  • a second magnet may be provided on the second suspension, in which case, the second suspension boss is formed to protrude upward.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
PCT/KR2009/006438 2009-08-20 2009-11-04 다기능 마이크로 스피커 WO2011021745A1 (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20-2009-0010878 2009-08-20
KR2020090010878U KR20110001968U (ko) 2009-08-20 2009-08-20 다기능 마이크로 스피커

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WO2011021745A1 true WO2011021745A1 (ko) 2011-02-24

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KR (1) KR20110001968U (zh)
CN (2) CN101998211B (zh)
TW (2) TW201108758A (zh)
WO (1) WO2011021745A1 (zh)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP2475190A1 (en) * 2009-09-04 2012-07-11 BSE Co., Ltd. Multifunctional micro-speaker
EP3509322A1 (en) * 2018-01-08 2019-07-10 Skullcandy, Inc. Driver assemblies, headphones including driver assemblies, and related methods

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KR20110001968U (ko) * 2009-08-20 2011-02-28 주식회사 비에스이 다기능 마이크로 스피커
US20140056468A1 (en) * 2012-01-20 2014-02-27 Panasonic Corporation Magnetic circuit for loudspeaker and loudspeaker using the same
KR101460431B1 (ko) * 2013-01-23 2014-11-12 부전전자 주식회사 전자기 댐핑 기능을 갖는 전자음향변환기
CN105072527A (zh) * 2015-07-20 2015-11-18 朝阳聚声泰（信丰）科技有限公司 一种入耳式受话器
CN108289269B (zh) * 2018-01-04 2019-08-02 瑞声科技(新加坡)有限公司 扬声器箱

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Publication number Priority date Publication date Assignee Title
EP2475190A1 (en) * 2009-09-04 2012-07-11 BSE Co., Ltd. Multifunctional micro-speaker
EP2475190A4 (en) * 2009-09-04 2013-05-01 Bse Co Ltd MULTIFUNCTIONAL MICROPHONE SPEAKER
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CN101998211A (zh) 2011-03-30
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CN201608883U (zh) 2010-10-13
TW201108758A (en) 2011-03-01
TWM385175U (en) 2010-07-21

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