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WO2019058523A1 - Haut-parleur - Google Patents

Haut-parleur Download PDF

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Publication number
WO2019058523A1
WO2019058523A1 PCT/JP2017/034348 JP2017034348W WO2019058523A1 WO 2019058523 A1 WO2019058523 A1 WO 2019058523A1 JP 2017034348 W JP2017034348 W JP 2017034348W WO 2019058523 A1 WO2019058523 A1 WO 2019058523A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
yoke
main body
case main
speaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/034348
Other languages
English (en)
Japanese (ja)
Inventor
賢太 田中
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.)
Tokyo Onkyo Co Ltd
Original Assignee
Tokyo Onkyo 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 Tokyo Onkyo Co Ltd filed Critical Tokyo Onkyo Co Ltd
Priority to JP2019542925A priority Critical patent/JPWO2019058523A1/ja
Priority to PCT/JP2017/034348 priority patent/WO2019058523A1/fr
Publication of WO2019058523A1 publication Critical patent/WO2019058523A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones

Definitions

  • the present invention relates to a speaker device, and more particularly to an improvement of an intra-concha type speaker device used for an earphone worn on a user's ear.
  • one end face of a cylindrical drive magnet 5 is fixed in a cup-shaped yoke 3 disposed in a case main body 1.
  • the vibrating membrane 7 facing the end face of the yoke is fixed to the open end of the yoke 3 and the cylindrical voice coil 9 fixed to the vibrating membrane 7 is slightly spaced on the outer periphery of the driving magnet 5
  • the inserted configuration is well known.
  • the case body 1 comprises a funnel-shaped case base 11a and a front cover 11b covering the front end (right side in the drawing), and the opening end of the yoke 3 is fixed in the front cover 11b.
  • Reference numeral 13 in FIG. 7 denotes a plurality of sound through holes which are formed on the front surface of the diaphragm 7 and penetrate the front cover 11b, and reference numeral 15 denotes a cable led to the outside.
  • the drive unit 17 for vibrating the diaphragm 7 is formed by the magnet 5 and the voice coil 9, and the diaphragm 7 is vibrated by applying an audio signal to the voice coil 9 from the outside via the cable 15. A sound is produced and the sound produced is transmitted from the sound through hole 13 in front of the diaphragm 7 to the outside.
  • the speaker device as an actual product is to make the vibrating membrane 7 approach the concha 23 in the concha cavity 25 surrounded by the user's ear tragus 19, the toe 21, and the concha 23. And the case body 1 is inserted and positioned. That is, the speaker device described above is used by elastically supporting the case main body 1 between the tragus 19 and the antiparallel beads 21.
  • FIG. 7 shows a state in which the earphone device is attached to the left ear.
  • the above-described speaker device has a problem that the aperture diameter of the speaker is easily limited because the case body (speaker portion) 1 enters the concha cavity 25.
  • the tragus 19 and the antitragus 21 are strongly pressed by the case main body 1, and there is a problem that the ear is easily ache.
  • the gap between the external ear canal 27 and the case body 1 is large, so that the bass reproduction is insufficient, or the left side portion (upper part in FIG. 7) of the case body 1
  • the diaphragm 7 of the speaker body 1 faces the side of the concha 23 and the diaphragm 7 separates from the ear canal 27, the reproduced sound is not sufficiently transmitted to the ear canal 27, etc. .
  • the vibration of the acoustic pipe of a predetermined length and the diaphragm 7 communicating the inside and outside of the case body 1 It is also known to form in the case body 1 a damping hole for damping the displacement.
  • the present invention has been made to solve such a problem, and an object of the present invention is to provide a speaker device which is easy to obtain a high quality reproduced sound as well as to improve the mountability.
  • the configuration according to the speaker device of the present invention comprises a disk-shaped diaphragm, a magnetic yoke supporting the diaphragm, and a voice coil fixed on the yoke side of the diaphragm.
  • the speaker unit includes a speaker unit having a drive unit disposed in the yoke and configured to displace the voice coil according to an applied audio signal to vibrate the diaphragm, and a case main body for housing and supporting the speaker unit.
  • the case main body is a sound through hole formed in the vicinity of the outer edge of the speaker portion, and the sound through hole for propagating the sound produced by the speaker portion to the ear canal of the user and the vibration thereof
  • a projecting portion which is erected and bent in a semi-cylindrical shape to form an anti-jelly contact surface for abutting on an anti-trawl facing the concha cavity
  • the speaker device may be configured to be in the case main body and to select the distance between the position farthest from the sound through hole and the sound through hole in the projecting portion to be 14 mm to 24 mm.
  • an acoustic pipe communicating with the inside of the case main body at one end side of the fan shape and communicating with the outside at the other end portion of the fan shape is also formed inside the projecting tip of the projecting portion. It is possible.
  • a damping hole for acoustic braking which communicates the inside of the case body with the outside at a position surrounded by the projecting portion in the case body.
  • the case main body is formed in the vicinity of the outer edge of the speaker portion, and the sound passing hole for propagating the sound produced to the ear canal A trabecular contact surface on the outer surface facing this to abut against the tragus, a fan-like standing from the case main body to the outside on the back side of the yoke and bent in a semi-cylindrical shape Since it is a projecting portion provided and has a projecting portion forming an anti-collar contact surface for abutting on the facing anti-parallel beads, mounting is carried out regardless of the size and shape of the case main body for housing the loudspeaker unit. It is easy to improve the quality.
  • the entire case main body for housing the speaker unit is housed in the concha cavity, the diameter of the speaker unit is restricted, and it is difficult to make the speaker unit larger.
  • the sound through hole of the case main body is in contact with the external ear canal, approximately half of the case main body protrudes outward, so the restriction on the diameter of the speaker portion is reduced.
  • the configuration of the earphone device in the case main body in the configuration where the distance between the position farthest from the sound through hole and the sound through hole is selected to be 14 mm to 24 mm.
  • the sound through hole can be formed to be long and be inserted through the external ear canal, and sound leakage from the gap can be suppressed to make bass reproduction advantageous.
  • the speaker device in the configuration in which an acoustic pipe communicating with the inside of the case main body at one end of the fan shape and communicating with the outside at the other fan end is formed inside the protruding tip of the projecting portion.
  • the formation of the acoustic tube is easy, and the adjustment of the reproduction sound of high quality is possible through the adjustment of the acoustic tube.
  • the damping hole can be easily formed in the configuration in which the damping hole for acoustic braking that communicates the inside and the outside of the case body is formed at the position surrounded by the projecting portion in the case body. It is possible to adjust the quality of the reproduced sound through the adjustment of the braking holes.
  • FIG. 2 It is a cross-sectional view (I-I cross section in FIG. 2) which concerns on the speaker apparatus of this invention. It is a front view of the speaker apparatus shown in FIG. It is a schematic perspective view of the speaker apparatus shown in FIG. It is the schematic which shows the usage example of the speaker apparatus shown in FIG.
  • FIG. 3 is a schematic longitudinal sectional view (cross section taken along the line V-V in FIG. 2) of the speaker device shown in FIG. 2; It is a frequency characteristic figure which concerns on the speaker apparatus shown in FIG. It is a schematic sectional drawing which shows the conventional speaker apparatus with the example of its use.
  • FIG. 1 to 3 are a cross-sectional view (a cross-sectional view taken along line II in FIG. 2), a front view and a schematic perspective view showing the configuration according to the speaker device of the present invention.
  • the yoke 29 is formed into a cup shape from a magnetic plate material, and the open end side (upper side in FIG. 1) of the cylindrical portion 29a is a ring plate made of a magnetic material.
  • the flange 31 is fixed, and a through hole is formed at the center of the bottom 29 b of the yoke 29.
  • a cylindrical drive magnet 33 is fixed in the yoke 29, overlapping one end face (lower side in FIG. 1) on the bottom portion 29b so as to align the hollow portion with the through hole of the bottom portion 29b; It is stored.
  • a ring-shaped pole piece 35 On the other end face (upper side in FIG. 1) of the drive magnet 33, a ring-shaped pole piece 35 having an outer diameter equal to or slightly larger than the outer diameter of the drive magnet 33 is superimposed.
  • the pole piece 35 has a hollow portion aligned with the hollow portion of the drive magnet 33.
  • a circuit board 37 having a through hole at the center portion is overlapped so that the through holes of the circuit board 37 and the through holes of the bottom portion 29b are aligned.
  • the yoke 29, the drive magnet 33, the pole piece 35 and the circuit board 37 are formed by caulking both ends of a tubular fastener 39 which is penetrated from the pole piece 35 or the circuit board 37 through the hollow portion and the through hole thereof. Are coaxially integrated, and they are fixed to the bottom 29 b of the yoke 29.
  • the yoke 29, the drive magnet 33, the pole piece 35 and the circuit board 37 may be coaxially fixed by an adhesive or the like (not shown).
  • the pole piece 35 is formed of a magnetic material for magnetic flux concentration for obtaining high sound quality, and the outer periphery thereof is circumferentially opposed at substantially the same level position as the tip of the cylindrical portion 29 a of the yoke 29 and the inner periphery of the flange 31. doing.
  • a magnetic circuit is formed by the magnetic flux from the yoke 29 between the outer periphery of the pole piece 35 and the end of the cylindrical portion 29 a of the yoke 29 and the inner peripheral portion of the flange 31 opposed to each other with a slight gap therebetween. .
  • the vibrating film 41 is formed in a disk shape from a conventionally known thin and translucent insulating film material, and has a central region 41a formed by slightly expanding a relatively wide central portion into a dome shape, and the central region 41a concentrically. And an annular peripheral region 41b.
  • the vibrating membrane 41 has a space with respect to the flange 31 and the pole piece 35 and covers them, and the entire outer periphery of the outer peripheral region 41 b is fixed to the outer peripheral portion of the flange 31 with an adhesive or the like and supported thereby. .
  • a voice coil 43 formed by cylindrically winding a thin insulated wire covered with an insulating coating at an annular boundary between the central region 41a and the outer peripheral region 41b on one surface side (lower surface side in FIG. 1) of the vibrating membrane 41. One end face side is fixed so as to surround the central region 41a.
  • the voice coil 43 has an annular gap between the inner wall of the cylindrical portion 29 a of the yoke 29 and the inner peripheral portion of the flange 31 and the outer periphery of the drive magnet 33 and the pole piece 35. , And is annularly opposed to the flange 31, the yoke 29 and the drive magnet 33, respectively.
  • Two end lead wires (not shown) from the voice coil 43 are drawn inward from the root of the voice coil 43, are drawn out through the hollow portion 39a of the bolt 39, and are connected to the circuit board 37. ing.
  • An audio signal is supplied from an electronic device (not shown) to the circuit board 37 superimposed on the bottom 29 b of the yoke 29 by a cable 45 described later.
  • the voice coil 43 is displaced by the application of the voice signal from the circuit board 37 to the voice coil 43 through the lead wires at both ends, and the vibrating membrane 41 is driven to cause vibration displacement.
  • the yoke 29, the drive magnet 33, and the voice coil 43 form a drive unit 47 for driving the diaphragm 41, and a so-called internal magnet type speaker unit 49 is formed.
  • symbol 51 in FIG. 1 is an acoustic damping member for acoustic impedance adjustment which plugs up the hollow part 39a of the gutter 39 by the lower end surface in the figure, and it is rich in breathability.
  • the speaker unit 49 has a case base 53 made of synthetic resin as a first case member and a front cover 55 made of synthetic resin as a second case member mutually overlapping. It is stored and supported in the case main body 57 in which the inner storage space is formed.
  • the case base 53 has a circular outer edge and is formed in a generally flat hemispherical shape
  • the front cover 55 has an outer edge formed in substantially the same circle as the case base 53 and is generally formed in a flat shape.
  • the case base 53 is integrated with the inside of the open front end of the front cover 55 so that the open front end sandwiches the flange 31 of the speaker unit 49 with the front cover 55.
  • a sound passing cylinder 55a that protrudes outward and slightly upward in FIG. 1 is formed in the front cover 55 near the outer edge of the speaker 49, thereby forming a sound passing hole 55b that communicates the inside and the outside of the case body 57. It is done.
  • the sound from the vibrating membrane 41 is transmitted from the sound through hole 55b to the ear canal 59 of the user's ear, as shown in FIG.
  • the outer surface facing the vibrating membrane 41 in the vicinity of the vibrating membrane 41 forms a tragus contact surface 55c for contacting the tragus 63 facing the concha cavity 61 of the user.
  • a cylindrical support column 53a is provided so as to protrude from the opposite side to the sound passing cylinder 55a, ie, at a position far from the sound passing cylinder 55a (see FIGS. 2 and 3). ).
  • the support column 53a is formed in such a positional relationship that the virtual center line penetrates the page of FIG. 1 and is orthogonal to the support column 53a, and is supported by the case base 53.
  • the cable 45 inserted from the outside into the support column 53 a is introduced into the case base 53 from the middle of the support column 53 a and is connected to the circuit board 37.
  • a projecting portion 53b which is provided on the back side of the yoke 29 so as to stand outward in a fan shape and bent in a semi-cylindrical shape.
  • the protruding portion 53 b has a surface 37 c against which the outer surface of the distal end abuts on the antitragus ball 65 facing the concha cavity 61 of the user.
  • an interval A between a position farthest from the tip of the sound through hole 55b (the sound through cylinder 55a) of the protrusion 53b and the sound through hole 55b is, for example, It is selected from 14 mm to 24 mm, and the earphone device has dimensions suitable for the user's ear.
  • the outer diameter of the case body 1 is set to about ⁇ 17 mm at maximum.
  • the anti-tracheal contact portion 53 c and the tragus-abutment surface 55 c are fixed between the tragus 63 and the antitragus 65. There is no problem in terms of wearability and sound quality even if the dimension of is set to 19 mm.
  • the sound tube 55a like an elephant's nose and extending it toward the ear canal 59 or vice versa. Therefore, in the configuration described above, it is preferable to set the value of the interval A to ⁇ 5 mm.
  • Reference numeral 67 a in FIGS. 3 and 4 is an opening that leads from the acoustic tube 67 to the outside.
  • a fan-shaped projecting portion 53b is formed so as to form a narrow convex inner space 53d.
  • the arc strip 69 formed separately from the case base 53 and along the arc of the projecting portion 53b is formed in the case base 53 by closing it against the convex inner space 53d. It is possible.
  • FIG. 5 shows a cross section between V and V in FIG. 2 and, for the sake of clarity, the arc strip 69 is illustrated as being straight, but as can also be understood from FIG. In fact, it is curved in an arc shape, and is accommodated and fixed in the case base 53.
  • the speaker unit 49 is schematically shown.
  • the acoustic tube 67 itself is formed to be curved along the tip inside of the tip of the projecting portion 53b.
  • a damping hole 71 for acoustic damping which communicates the case main body 57 with the outside, is formed to penetrate.
  • the braking hole 71 is closed by an acoustic braking member 73 that adjusts the air permeability according to the required performance.
  • the drive unit 31 by supplying an audio signal from the cable 45 through the circuit board 37 and applying the audio signal to the voice coil 43, the drive unit 31 causes the diaphragm 41 to vibrate and produce sound, and the sound through hole 55b is generated. Vibration sound is transmitted to the outside from the
  • the tragus contact surface 55c is brought into contact with the user's tragus 63, and the projecting portion 53b (anti-tracheal contact portion 53c)
  • the sound through hole 55b is slightly inserted into the external ear canal 59 while being in contact with the outer ear canal 59
  • the half of the sound through hole 55b side of the case main body 57 is surrounded by the tragus 63 It is used by inserting and inserting into the catheter 61.
  • FIG. 6 is a frequency characteristic diagram shown by the above-described speaker device of the present invention and the conventional speaker device of FIG. 7, for example.
  • the sound pressure characteristics are particularly good down to the low range, and high quality sound reproduction is possible in a wide frequency range. It can be seen that the sound pressure characteristics of the above speaker device are exhibited.
  • the broken line b in FIG. 6 shows the same characteristic when the acoustic tube 67 is closed in the configuration of FIG. In this figure, the low band reproduction capability of the acoustic tube 67 is shown.
  • the sound passage 55b (the sound tube 55a) of the case main body 57 is fitted to the entrance of the user's ear canal 59, and the tragus contact surface 55c of the case main body 57 is Abuts on the user's tragus 63 and abuts the projecting portion 53b of the case main body 57 on the anti-trawl 65 of the user as the anti-collar contact surface 53c, Since the bead contact surface 53c is configured to be held between the tragus 63 and the anti-tail 65, there is an advantage that the shape and size of the case main body 57 hardly depends on the mountability. Regardless of it, it is easy to improve the mountability.
  • the distance between the position farthest from the sound through hole 55b and the sound through hole 55b in the projecting portion 53b is 14 mm to 24 mm. Even in the configuration of the earphone device, the above-described effects can be secured.
  • the sound through hole 55b of the case main body 57 can be formed to be long and be inserted into the external ear canal 59, so that sound leakage from the gap can be suppressed and good bass reproduction can be maintained. It is.
  • the braking holes 71 face the side of the concha cavity 61, it is possible to reduce the amount of sound leakage from the braking holes 71 more than in the conventional speaker device, resulting in less waste in structure.
  • the speaker device it is easy to form the sound quality adjustment sound pipe 67 of a predetermined length inside the projecting portion 53b by using the projecting portion 53b, and the vibration displacement of the diaphragm 41 is damped.
  • the braking hole 71 to be applied is also easily formed in the case main body 57.
  • the dimensions do not easily affect the mountability, and the arrangement space for the acoustic pipe 67 and the braking hole 71 is easy to secure. If the selection is made and the inner diameter of the damping hole 71 is also appropriately selected, it is easy to improve the mountability and to obtain high-quality reproduced sound.
  • the speaker device is not limited to the above-described configuration of the speaker 49, but may be a disk-shaped diaphragm, a magnetic yoke for supporting the diaphragm, and a voice coil fixed on the yoke side of the diaphragm. And a driving unit for displacing the voice coil by the voice signal disposed and applied to the yoke to cause the vibrating membrane to vibrate and drive.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)

Abstract

Le problème à résoudre par la présente invention est d'améliorer l'adaptation d'un haut-parleur à l'oreille d'un utilisateur. La solution selon l'invention porte sur une partie de haut-parleur 49 dans laquelle est disposée une membrane de vibration 41, une culasse 29, une bobine acoustique 43 et une partie d'entraînement 47 de la bobine acoustique 43. Un corps de boîtier 57 loge et supporte la partie de haut-parleur 49. Le corps de boîtier 57 a un trou de passage de son 55b pour propager un son vers l'extérieur à proximité du bord externe de la partie de haut-parleur 49. La surface externe faisant face à la membrane de vibration 41 sert de surface de butée de tragus 55c pour l'utilisateur. Le corps de boîtier 57 a une partie de projection 53b qui est courbée selon une forme semi-cylindrique de façon à être projetée et installée en forme de ventilateur vers l'extérieur sur le côté arrière de la culasse 29. La partie saillante 53b est définie comme une surface de butée d'anti-tragus 53c pour l'utilisateur.
PCT/JP2017/034348 2017-09-22 2017-09-22 Haut-parleur Ceased WO2019058523A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2019542925A JPWO2019058523A1 (ja) 2017-09-22 2017-09-22 スピーカ装置
PCT/JP2017/034348 WO2019058523A1 (fr) 2017-09-22 2017-09-22 Haut-parleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/034348 WO2019058523A1 (fr) 2017-09-22 2017-09-22 Haut-parleur

Publications (1)

Publication Number Publication Date
WO2019058523A1 true WO2019058523A1 (fr) 2019-03-28

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ID=65810662

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/034348 Ceased WO2019058523A1 (fr) 2017-09-22 2017-09-22 Haut-parleur

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JP (1) JPWO2019058523A1 (fr)
WO (1) WO2019058523A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240007778A1 (en) * 2020-05-26 2024-01-04 Bose Corporation In-ear earpiece retaining structure
CN117499833A (zh) * 2023-12-29 2024-02-02 成都弱水科技有限公司 一种蓝牙耳机

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009290666A (ja) * 2008-05-30 2009-12-10 Victor Co Of Japan Ltd ヘッドホン
WO2010005039A1 (fr) * 2008-07-09 2010-01-14 パイオニア株式会社 Ecouteur
JP2011223211A (ja) * 2010-04-07 2011-11-04 Victor Co Of Japan Ltd イヤホン
JP2013021591A (ja) * 2011-07-13 2013-01-31 Jvc Kenwood Corp イヤホン
JP2015076856A (ja) * 2013-10-11 2015-04-20 パイオニア株式会社 イヤホン装置
JP2015195444A (ja) * 2014-03-31 2015-11-05 株式会社Ｊｖｃケンウッド 当接部材及びイヤホン
JP2015228694A (ja) * 2010-08-16 2015-12-17 ボーズ・コーポレーションＢｏｓｅｃｏｒｐｏｒａｔｉｏｎ イヤピース位置決めおよび保持構造体
JP2017526308A (ja) * 2014-09-05 2017-09-07 ボーズ・コーポレーションＢｏｓｅ Ｃｏｒｐｏｒａｔｉｏｎ イヤーピース用保持構造

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6810987B1 (en) * 2002-12-06 2004-11-02 Plantronics, Inc. Earbud headset

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009290666A (ja) * 2008-05-30 2009-12-10 Victor Co Of Japan Ltd ヘッドホン
WO2010005039A1 (fr) * 2008-07-09 2010-01-14 パイオニア株式会社 Ecouteur
JP2011223211A (ja) * 2010-04-07 2011-11-04 Victor Co Of Japan Ltd イヤホン
JP2015228694A (ja) * 2010-08-16 2015-12-17 ボーズ・コーポレーションＢｏｓｅｃｏｒｐｏｒａｔｉｏｎ イヤピース位置決めおよび保持構造体
JP2013021591A (ja) * 2011-07-13 2013-01-31 Jvc Kenwood Corp イヤホン
JP2015076856A (ja) * 2013-10-11 2015-04-20 パイオニア株式会社 イヤホン装置
JP2015195444A (ja) * 2014-03-31 2015-11-05 株式会社Ｊｖｃケンウッド 当接部材及びイヤホン
JP2017526308A (ja) * 2014-09-05 2017-09-07 ボーズ・コーポレーションＢｏｓｅ Ｃｏｒｐｏｒａｔｉｏｎ イヤーピース用保持構造

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240007778A1 (en) * 2020-05-26 2024-01-04 Bose Corporation In-ear earpiece retaining structure
US12238471B2 (en) * 2020-05-26 2025-02-25 Bose Corporation In-ear earpiece retaining structure
CN117499833A (zh) * 2023-12-29 2024-02-02 成都弱水科技有限公司 一种蓝牙耳机
CN117499833B (zh) * 2023-12-29 2024-05-07 成都弱水科技有限公司 一种蓝牙耳机

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