WO2006088279A1 - Double diaphragm micro speaker - Google Patents

Double diaphragm micro speaker Download PDF

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Publication number
WO2006088279A1
WO2006088279A1 PCT/KR2005/002618 KR2005002618W WO2006088279A1 WO 2006088279 A1 WO2006088279 A1 WO 2006088279A1 KR 2005002618 W KR2005002618 W KR 2005002618W WO 2006088279 A1 WO2006088279 A1 WO 2006088279A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
micro speaker
diaphragms
voice coil
vibration
Prior art date
Application number
PCT/KR2005/002618
Other languages
French (fr)
Inventor
Kye Soo Lee
Original Assignee
Bse Co., Ltd.
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 Bse Co., Ltd. filed Critical Bse Co., Ltd.
Publication of WO2006088279A1 publication Critical patent/WO2006088279A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/08—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers separated by air or other fluid
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
    • 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

Definitions

  • the present invention relates to a micro speaker, and more particularly, to a micro speaker of a dual diaphragm structure having an air damping layer wherein an acoustic characteristic is improved by dual diaphragms.
  • a micro speaker is a speaker having a dimension ranging from a few millimeters to tens of millimeters a few to widely used in an earphone, a cellular phone or a toy for a baby.
  • the micro speaker comprises a magnetic circuit unit including yoke with a built-in magnet and a plate, a vibrating unit having a fixed voice coil (a diaphragm and a plate), and a frame for fixing a terminal for inputting en electrical signal to the vibrating unit, the magnetic circuit unit and the voice coil.
  • FIG. 1 is a cross-sectional view illustrating a conventional micro speaker.
  • the conventional micro speaker 100 comprises a yoke 102, a magnet 10, a plate attached above the magnet 104, a frame 108 for supporting a diaphragm 110, the diaphragm 110, a voice coil 112 extruding from the diaphragm 110 and mounted in a gap H between the plate 106 and the yoke 102 and a grill 120.
  • the voice coil 112 is electrically connected to a terminal (not shown) so that a voice signal current flows therein.
  • a direct current magnetic field is generated about the gap H by a typical speaker structure consisting of the plate 106, the magnet 104, and the yoke 102, and a signal current is applied to the voice coil 112 inserted in the direct current magnetic field.
  • a signal current is applied to the voice coil 112 inserted in the direct current magnetic field.
  • the voice coil 112 disposed in the gap H moves vertically by a principle of a magnet wherein a N pole and a S pole intersects each other between the direct current magnetic field and the alternating current magnetic field so that a repulsive force is generated in case of NN pole and an attractive force is generated in case of NS pole, thereby also moving the diaphragm 110 attached to the voice coil 112.
  • a longitudinal wave is generated in an atmosphere in front of the diaphragm 110, which is transmitted to a human ear as a sound wave.
  • a partial divided vibration occurs by the asymmetric vibration due to an irregularity of the diaphragm itself, namely an irregularity of a thickness of the diaphragm and a resulting irregularity of the strength of the diaphragm.
  • a rib is process on a surface of the diaphragm to compensate for a vertical vibration strength.
  • the vertical vibration strength is partially improved by the compensation of the strength, the asymmetric vibration still exists and the sound quality is still distorted, and a bending and a loosening phenomenon by the rib generate an additional abnormal sound.
  • a thickness of the diaphragm is varied (increased). In this case, a low frequency sound is reduced, a frequency band is narrowed, and an acoustic pressure is reduced because a minimum resonance frequency is increased. Disclosure of Invention Technical Problem
  • a micro speaker comprising: a magnetic field generating unit for generating a direct current magnetic wave by a yoke having a magnet built-in and a plate; a voice coil having a coil inserted in a gap of the magnetic field generating unit, the voice coil being vibrated by an interaction between the direct current and an alternating current magnetic wave generated when a voice signal current flows in the coil; vibrating means having a dual structure wherein a first diaphragm and a second diaphragm attach stacked on each other, the vibrating means vibrating according to a vibration of the voice coil to generate a longitudinal wave; and a frame for supporting the first and the second diaphragms.
  • the first and the second diaphragms are not adhered to each other to have an air layer therebetween, the first and the second diaphragms have a same thickness and material or different thicknesses and materials, and the first and the second diaphragms are partially adhered to each other to adjust an area of an air layer.
  • the micro speaker of a dual diaphragm structure in accordance with the present invention provides wherein multiple diaphragms having a air layer therebetween to reduce an irregular vibration of the diaphragm by a damping function of the air layer, thereby obtaining a uniform vibration structure and minimizing a flat characteristic and a distortion. Accordingly, the asymmetric vibration is minimized to reduce a disconnection of a coil or a damage of the diaphragm in a long operation, thereby guaranteeing a long life span.
  • the micro speaker of the present invention provides an improved sound quality by minimizing a total harmonics in a reproduction band of the typical micro speaker, and accordingly, effectively providing an improved quality of miniaturized product and embodying a high sound quality product.
  • FIG. 1 is a schematic diagram illustrating a conventional micro speaker.
  • FIG. 2 is a cross-sectional view illustrating a micro speaker in accordance with the present invention.
  • FIG. 3 is a graph illustrating a characteristic of the speaker in accordance with the present invention. Best Mode for Carrying Out the Invention
  • FIG. 2 is a cross-sectional view illustrating a micro speaker in accordance with the present invention.
  • the micro speaker in accordance with the present invention comprises a yoke 102, a magnet 10, a plate attached above the magnet 104, a frame 108 for supporting diaphragms 220-1 and 220-2, the diaphragms 220-1 and 220-2 for generating a longitudinal wave in an atmosphere according to a voice coil 212, the voice coil 212 extruding from the diaphragms 220-1 and 220-2 and mounted in a gap H between the plate 106 and the yoke 102, and a grill 120 for protecting the diaphragms.
  • the voice coil 112 is electrically connected to a terminal (not shown) so that a voice signal current flows therein.
  • the micro speaker of the present invention employs two diaphragms, namely a dual structure consisting of the diaphragms 220-1 and 220-2.
  • An air layer A which performs a damping function exists between the diaphragms 220- 1 and 220-2 so that the diaphragms 220- 1 and 220-2 vibrates in a state of a concentric circle by the voice coil 212 to prevent a contact between the diaphragms 220-1 and 220-2 due to a mutual reverse vibration.
  • the diaphragms 220- 1 and 220-2 of the dual structure in accordance with the present invention resolves an asymmetry phenomenon and a self- division resonance phenomenon of the conventional art by a principle described below.
  • An abnormal vibration generated in the diaphragm 220-1 is uniformly spread out by the damping function of the air layer A between the diaphragm 220- 1 and the diaphragm 220-2 attached thereabove to restrain a divided vibration occurring in a certain portion.
  • Shapes of the diaphragms 220- 1 and 220-2 may be partially modified to adjust a space of the air layer A existing therebetween so as to change a pressure, thereby increasing a damping effect.
  • a vibration area is adjusted through a partial bonding to restrain an amplitude and a resonance point of a certain portion, thereby restraining the asymmetric vibration as well as reducing a distortion of sound.
  • a material and a thickness of the diaphragm 220-1 may differ from those of the diaphragm 220-2 to respective resonance point is mutually cancelled or amplified, thereby reducing a sound distortion phenomenon.
  • a direct current magnetic field is generated by a magnetic circuit consisting of the yoke 102, the magnet 104 and the plate 106, and the voice coil 212 is disposed in the gap H under an influence of the direct current magnetic field.
  • a voice signal current flows in the voice coil 212 under this condition, an alternating current magnetic field is generated.
  • a N pole and a S pole intersects each other between the direct current magnetic field generated in the magnetic circuit and the alternating current magnetic field generated by the voice coil so that a repulsive force is generated in case of NN pole and an attractive force is generated in case of NS pole.
  • the voice coil 212 disposed in the gap H moves vertically.
  • the first diaphragm 220-1 moves.
  • the second diaphragm 220-2 vibrates to generate the longitudinal wave in an atmosphere in front of the second diaphragm 220-2 which is transmitted to a human ear as a sound wave.
  • Fig. 3 is a graph illustrating a frequency response characteristic of the micro speaker in accordance with the present invention, wherein a characteristic of the conventional micro speaker is shown for comparison.
  • a horizontal axis is a frequency axis representing an audible frequency ranging from 200 Hz to 20 KHz, and a vertical axis represents an amplitude in dB.
  • a graph in solid line denotes the response characteristic of the conventional micro speaker and a dotted line denotes that of the micro speaker in accordance with the present invention.
  • a micro speaker of a dual diaphragm structure wherein multiple diaphragms having a air layer therebetween to reduce an irregular vibration of the diaphragm by a damping function of the air layer, thereby obtaining a uniform vibration structure and minimizing a flat characteristic and a distortion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)

Abstract

The present invention relates to a micro speaker of a dual diaphragm structure having an air damping layer wherein an acoustic characteristic is improved by dual diaphragms. The micro speaker of the present invention comprises a magnetic field generating unit for generating a direct current magnetic wave by a yoke having a magnet built-in and a plate; a voice coil having a coil inserted in a gap of the magnetic field generating unit, the voice coil being vibrated by an interaction between the direct current and an alternating current magnetic wave generated when a voice signal current flows in the coil; vibrating means having a dual structure wherein a first diaphragm and a second diaphragm attach stacked on each other, the vibrating means vibrating according to a vibration of the voice coil to generate a longitudinal wave; and a frame for supporting the first and the second diaphragms. In accordance with the micro speaker of a dual diaphragm structure of the present invention, two diaphragms having an air layer therebetween reduce an irregular vibration of the diaphragm by a damping function of the air layer, thereby obtaining a uniform vibration structure and minimizing a flat characteristic and a distortion.

Description

Description DOUBLE DIAPHRAGM MICRO SPEAKER
Technical Field
[1] The present invention relates to a micro speaker, and more particularly, to a micro speaker of a dual diaphragm structure having an air damping layer wherein an acoustic characteristic is improved by dual diaphragms. Background Art
[2] Generally, a micro speaker is a speaker having a dimension ranging from a few millimeters to tens of millimeters a few to widely used in an earphone, a cellular phone or a toy for a baby. The micro speaker comprises a magnetic circuit unit including yoke with a built-in magnet and a plate, a vibrating unit having a fixed voice coil (a diaphragm and a plate), and a frame for fixing a terminal for inputting en electrical signal to the vibrating unit, the magnetic circuit unit and the voice coil.
[3] Fig. 1 is a cross-sectional view illustrating a conventional micro speaker. The conventional micro speaker 100 comprises a yoke 102, a magnet 10, a plate attached above the magnet 104, a frame 108 for supporting a diaphragm 110, the diaphragm 110, a voice coil 112 extruding from the diaphragm 110 and mounted in a gap H between the plate 106 and the yoke 102 and a grill 120. The voice coil 112 is electrically connected to a terminal (not shown) so that a voice signal current flows therein.
[4] In accordance with an operation of the micro speaker 100, a direct current magnetic field is generated about the gap H by a typical speaker structure consisting of the plate 106, the magnet 104, and the yoke 102, and a signal current is applied to the voice coil 112 inserted in the direct current magnetic field. When the voice signal current flows in the voice coil 112, an alternating current magnetic field is generated. The voice coil 112 disposed in the gap H moves vertically by a principle of a magnet wherein a N pole and a S pole intersects each other between the direct current magnetic field and the alternating current magnetic field so that a repulsive force is generated in case of NN pole and an attractive force is generated in case of NS pole, thereby also moving the diaphragm 110 attached to the voice coil 112. A longitudinal wave is generated in an atmosphere in front of the diaphragm 110, which is transmitted to a human ear as a sound wave.
[5] However, in accordance with the conventional micro speaker, while the diaphragm vibrates in a process wherein an electrical signal is converted to a mechanical movement, an irregular vibration occurs during the vibration of the diaphragm to distort a frequency characteristic and a sound. That is, when a single diaphragm is used as in the conventional art, a divided vibration of the thin film diaphragm and an abnormal vibration occur, resulting in a serious effect such as the distortion of the sound quality. Specific disadvantages of the conventional art are as follows.
[6] First, a change in a uniformity of a strength of the diaphragm and an asymmetric strength by a lead wire for the voice coil attached to the diaphragm and an adhesive for fixing the same results in the abnormal vibration.
[7] Second, due to an effect of a terminal attached on a back surface of the frame, an asymmetric exhaust hole is formed to generate the asymmetric vibration.
[8] Third, a partial divided vibration occurs by the asymmetric vibration due to an irregularity of the diaphragm itself, namely an irregularity of a thickness of the diaphragm and a resulting irregularity of the strength of the diaphragm.
[9] Fourth, when the voice coil is bonded to the diaphragm, the irregularity of the strength of the diaphragm due to an adhesive occurs resulting in the asymmetric vibration.
[10] In order to improve the asymmetric vibration due to external causes applied to the diaphragm, and an irregularity factor of the diaphragm itself, the following methods are used in the conventional art.
[11] First, a rib is process on a surface of the diaphragm to compensate for a vertical vibration strength. In this case, while the vertical vibration strength is partially improved by the compensation of the strength, the asymmetric vibration still exists and the sound quality is still distorted, and a bending and a loosening phenomenon by the rib generate an additional abnormal sound.
[12] Second, a thickness of the diaphragm is varied (increased). In this case, a low frequency sound is reduced, a frequency band is narrowed, and an acoustic pressure is reduced because a minimum resonance frequency is increased. Disclosure of Invention Technical Problem
[13] It is an object of the present invention to provide a micro speaker of a dual diaphragm structure wherein multiple diaphragms having a air layer therebetween to reduce an irregular vibration of the diaphragm by a damping function of the air layer, thereby obtaining a uniform vibration structure and minimizing a flat characteristic and a distortion. Technical Solution
[14] In order to achieve the above object of the invention, there is provided a micro speaker comprising: a magnetic field generating unit for generating a direct current magnetic wave by a yoke having a magnet built-in and a plate; a voice coil having a coil inserted in a gap of the magnetic field generating unit, the voice coil being vibrated by an interaction between the direct current and an alternating current magnetic wave generated when a voice signal current flows in the coil; vibrating means having a dual structure wherein a first diaphragm and a second diaphragm attach stacked on each other, the vibrating means vibrating according to a vibration of the voice coil to generate a longitudinal wave; and a frame for supporting the first and the second diaphragms.
[15] Here, the first and the second diaphragms are not adhered to each other to have an air layer therebetween, the first and the second diaphragms have a same thickness and material or different thicknesses and materials, and the first and the second diaphragms are partially adhered to each other to adjust an area of an air layer.
Advantageous Effects
[16] As described above, the micro speaker of a dual diaphragm structure in accordance with the present invention provides wherein multiple diaphragms having a air layer therebetween to reduce an irregular vibration of the diaphragm by a damping function of the air layer, thereby obtaining a uniform vibration structure and minimizing a flat characteristic and a distortion. Accordingly, the asymmetric vibration is minimized to reduce a disconnection of a coil or a damage of the diaphragm in a long operation, thereby guaranteeing a long life span.
[17] Therefore, the micro speaker of the present invention provides an improved sound quality by minimizing a total harmonics in a reproduction band of the typical micro speaker, and accordingly, effectively providing an improved quality of miniaturized product and embodying a high sound quality product. Brief Description of the Drawings
[18] Fig. 1 is a schematic diagram illustrating a conventional micro speaker.
[19] Fig. 2 is a cross-sectional view illustrating a micro speaker in accordance with the present invention.
[20] Fig. 3 is a graph illustrating a characteristic of the speaker in accordance with the present invention. Best Mode for Carrying Out the Invention
[21] Fig. 2 is a cross-sectional view illustrating a micro speaker in accordance with the present invention.
[22] As shown in Fig. 2, the micro speaker in accordance with the present invention comprises a yoke 102, a magnet 10, a plate attached above the magnet 104, a frame 108 for supporting diaphragms 220-1 and 220-2, the diaphragms 220-1 and 220-2 for generating a longitudinal wave in an atmosphere according to a voice coil 212, the voice coil 212 extruding from the diaphragms 220-1 and 220-2 and mounted in a gap H between the plate 106 and the yoke 102, and a grill 120 for protecting the diaphragms. The voice coil 112 is electrically connected to a terminal (not shown) so that a voice signal current flows therein. Mode for the Invention
[23] Particularly, while the conventional micro speaker employs a single diaphragm (110 of Fig. 1), the micro speaker of the present invention employs two diaphragms, namely a dual structure consisting of the diaphragms 220-1 and 220-2. An air layer A which performs a damping function exists between the diaphragms 220- 1 and 220-2 so that the diaphragms 220- 1 and 220-2 vibrates in a state of a concentric circle by the voice coil 212 to prevent a contact between the diaphragms 220-1 and 220-2 due to a mutual reverse vibration.
[24] As described above, the diaphragms 220- 1 and 220-2 of the dual structure in accordance with the present invention resolves an asymmetry phenomenon and a self- division resonance phenomenon of the conventional art by a principle described below.
[25] An abnormal vibration generated in the diaphragm 220-1 is uniformly spread out by the damping function of the air layer A between the diaphragm 220- 1 and the diaphragm 220-2 attached thereabove to restrain a divided vibration occurring in a certain portion. Shapes of the diaphragms 220- 1 and 220-2 may be partially modified to adjust a space of the air layer A existing therebetween so as to change a pressure, thereby increasing a damping effect. In addition, by modifying the shapes of the diaphragms 220- 1 and 220-2, a vibration area is adjusted through a partial bonding to restrain an amplitude and a resonance point of a certain portion, thereby restraining the asymmetric vibration as well as reducing a distortion of sound. Moreover, a material and a thickness of the diaphragm 220-1 may differ from those of the diaphragm 220-2 to respective resonance point is mutually cancelled or amplified, thereby reducing a sound distortion phenomenon.
[26] An operation of the micro speaker in accordance with the present invention will be described in the following.
[27] A direct current magnetic field is generated by a magnetic circuit consisting of the yoke 102, the magnet 104 and the plate 106, and the voice coil 212 is disposed in the gap H under an influence of the direct current magnetic field. When a voice signal current flows in the voice coil 212 under this condition, an alternating current magnetic field is generated. A N pole and a S pole intersects each other between the direct current magnetic field generated in the magnetic circuit and the alternating current magnetic field generated by the voice coil so that a repulsive force is generated in case of NN pole and an attractive force is generated in case of NS pole. By the principle of the magnet, the voice coil 212 disposed in the gap H moves vertically. When the voice coil 212 moves vertically, the first diaphragm 220-1 moves. [28] The movement of the first diaphragm 220-1 is transferred to the second diaphragm
220-2 through the air layer A which provides the damping function in accordance with the present invention, and accordingly, the second diaphragm 220-2 vibrates to generate the longitudinal wave in an atmosphere in front of the second diaphragm 220-2 which is transmitted to a human ear as a sound wave.
[29] As described above, since the vibration of the second diaphragm 220-2 is generated by transferring the vibration of the first diaphragm 220- 1 via the air layer A performing a damping function, the abnormal vibration generated due to a typical speaker structure is uniformly spread out to reduce the divided vibration occurring in a particular portion.
[30] Fig. 3 is a graph illustrating a frequency response characteristic of the micro speaker in accordance with the present invention, wherein a characteristic of the conventional micro speaker is shown for comparison.
[31] Referring to Fig. 3, a horizontal axis is a frequency axis representing an audible frequency ranging from 200 Hz to 20 KHz, and a vertical axis represents an amplitude in dB. In addition, a graph in solid line denotes the response characteristic of the conventional micro speaker and a dotted line denotes that of the micro speaker in accordance with the present invention.
[32] Comparing the both graphs, the frequency response characteristic of the micro speaker in accordance with the present invention is relatively flatter in the entire audible frequency range.
Industrial Applicability
[33] A micro speaker of a dual diaphragm structure is provided wherein multiple diaphragms having a air layer therebetween to reduce an irregular vibration of the diaphragm by a damping function of the air layer, thereby obtaining a uniform vibration structure and minimizing a flat characteristic and a distortion.
[34]
[35]
[36]

Claims

Claims
[1] A micro speaker comprising: a magnetic field generating unit for generating a direct current magnetic wave by a yoke having a magnet built-in and a plate; a voice coil having a coil inserted in a gap of the magnetic field generating unit, the voice coil being vibrated by an interaction between the direct current and an alternating current magnetic wave generated when a voice signal current flows in the coil; vibrating means having a dual structure wherein a first diaphragm and a second diaphragm are stacked on each other, the vibrating means vibrating according to a vibration of the voice coil to generate a longitudinal wave; and a frame for supporting the first and the second diaphragms.
[2] The micro speaker in accordance with claim 1, wherein the first and the second diaphragms are not adhered to each other to have an air layer therebetween.
[3] The micro speaker in accordance with claim 1, wherein the first and the second diaphragms have a same thickness and material or different thicknesses and materials.
[4] The micro speaker in accordance with claim 1, wherein the first and the second diaphragms are partially adhered to each other to adjust an area of an air layer.
PCT/KR2005/002618 2005-02-21 2005-08-11 Double diaphragm micro speaker WO2006088279A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2005-0014148 2005-02-21
KR20050014148A KR100638057B1 (en) 2005-02-21 2005-02-21 Double Diaphragm Micro speaker

Publications (1)

Publication Number Publication Date
WO2006088279A1 true WO2006088279A1 (en) 2006-08-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2005/002618 WO2006088279A1 (en) 2005-02-21 2005-08-11 Double diaphragm micro speaker

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WO (1) WO2006088279A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014113930A1 (en) * 2013-01-23 2014-07-31 易力声科技(深圳)有限公司 Loudspeaker
CN108600927A (en) * 2018-07-30 2018-09-28 广州斐诺电子科技有限公司 A kind of Microspeaker with acoustics shock-absorbing function

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100101921A (en) * 2009-03-10 2010-09-20 주식회사 비에스이 Diaphragm for micro-speaker and method of manufacturing method of the diaphragm
KR101062039B1 (en) 2009-08-27 2011-09-05 신정열 Slim speakers
KR101046005B1 (en) * 2009-10-09 2011-07-01 에스텍 주식회사 speaker
KR200453837Y1 (en) * 2009-11-30 2011-05-30 최윤길 Speaker

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940575A (en) * 1975-03-03 1976-02-24 Cbs Inc. Directional microphone
JPH06303698A (en) * 1993-04-12 1994-10-28 Sony Corp Microphone and its manufacture
US20020181725A1 (en) * 2001-05-31 2002-12-05 Ib Johannsen Method of providing a hydrophobic layer and a condenser microphone having such a layer
US6707920B2 (en) * 2000-12-12 2004-03-16 Otologics Llc Implantable hearing aid microphone
US20040151335A1 (en) * 2001-04-24 2004-08-05 Gino Pavlovic Microphone capsule support

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940575A (en) * 1975-03-03 1976-02-24 Cbs Inc. Directional microphone
JPH06303698A (en) * 1993-04-12 1994-10-28 Sony Corp Microphone and its manufacture
US6707920B2 (en) * 2000-12-12 2004-03-16 Otologics Llc Implantable hearing aid microphone
US20040151335A1 (en) * 2001-04-24 2004-08-05 Gino Pavlovic Microphone capsule support
US20020181725A1 (en) * 2001-05-31 2002-12-05 Ib Johannsen Method of providing a hydrophobic layer and a condenser microphone having such a layer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014113930A1 (en) * 2013-01-23 2014-07-31 易力声科技(深圳)有限公司 Loudspeaker
CN108600927A (en) * 2018-07-30 2018-09-28 广州斐诺电子科技有限公司 A kind of Microspeaker with acoustics shock-absorbing function

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KR100638057B1 (en) 2006-10-24

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