WO2024080017A1 - Speaker unit - Google Patents

Speaker unit Download PDF

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Publication number
WO2024080017A1
WO2024080017A1 PCT/JP2023/031430 JP2023031430W WO2024080017A1 WO 2024080017 A1 WO2024080017 A1 WO 2024080017A1 JP 2023031430 W JP2023031430 W JP 2023031430W WO 2024080017 A1 WO2024080017 A1 WO 2024080017A1
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WO
WIPO (PCT)
Prior art keywords
voice coil
coil bobbin
speaker unit
diaphragm
avoidance
Prior art date
Application number
PCT/JP2023/031430
Other languages
French (fr)
Japanese (ja)
Inventor
哲太 黒沢
Original Assignee
フォスター電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by フォスター電機株式会社 filed Critical フォスター電機株式会社
Publication of WO2024080017A1 publication Critical patent/WO2024080017A1/en

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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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
    • 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
    • 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

Definitions

  • This disclosure relates to a speaker unit.
  • a speaker unit includes a magnetic circuit, a voice coil bobbin around which a voice coil is wound, a signal transmission circuit connected to the voice coil, and a diaphragm attached to the peripheral surface of the voice coil bobbin.
  • the voice coil vibrates, and the vibration of the voice coil is transmitted to the diaphragm via the voice coil bobbin.
  • in-car speaker units need to be mounted in a limited space, so it is desirable to make the speaker unit as a whole thinner.
  • the conductor that serves as the signal transmission circuit is joined to the periphery of the voice coil bobbin by soldering or the like, but this joint may interfere with the diaphragm that is also attached to the voice coil bobbin. If the distance between the joint and the mounting part of the diaphragm is increased in order to avoid such interference between the joint and the diaphragm, this will result in an increase in the size of the speaker unit. Furthermore, making the diaphragm thinner (flatter) will reduce the rigidity of the diaphragm.
  • This disclosure has been made to solve these problems, and its purpose is to provide a speaker unit that can achieve a thin overall unit while minimizing the loss of rigidity in the diaphragm.
  • the speaker unit includes a voice coil bobbin around which a voice coil is wound, a tinsel wire joined to a conductor connected to the voice coil on the circumferential surface of the voice coil bobbin, and a diaphragm having an avoidance portion formed in a shape that avoids the joint between the tinsel wire and the conductor.
  • the speaker unit disclosed herein uses the above-mentioned means to prevent a decrease in the rigidity of the diaphragm while making it possible to achieve a thin overall unit.
  • FIG. 1 is a perspective view of a speaker unit according to an embodiment of the present disclosure.
  • FIG. 1 is a plan view of a speaker unit according to an embodiment of the present disclosure.
  • FIG. 2 is a bottom view of the speaker unit according to an embodiment of the present disclosure.
  • 3 is an end view of the speaker unit according to the embodiment of the present disclosure taken along line AA shown in FIG. 2.
  • 5 is a schematic enlarged end view for explaining a configuration in the vicinity of a joint X shown in FIG. 4.
  • 1 is a perspective view of a diaphragm provided in a speaker unit according to an embodiment of the present disclosure.
  • one side means one side in the axial direction of the voice coil bobbin 60
  • the other side means the other side in the axial direction of the voice coil bobbin 60.
  • the axis of the voice coil bobbin 60 is indicated by the symbol A.
  • the planar direction perpendicular to the axial direction of the voice coil bobbin 60 includes the radial direction of the voice coil bobbin 60.
  • the speaker unit 1 is an in-vehicle speaker that is mounted, for example, on a base box in the door of a vehicle, and includes a yoke 10, a magnet 20, a plate 30, a frame 40, a tinsel wire-integrated damper 50, a voice coil bobbin 60, a diaphragm 70, an edge portion 73, a cap 80, and an attachment portion 90. Note that Figure 1 shows the state with the cap 80 removed.
  • the yoke 10 is a ferromagnetic material for forming a magnetic circuit, and includes a thin, disk-shaped base portion 11 and a cylindrical pole portion 12 that protrudes to one side from the radial center of the base portion 11.
  • the magnet 20 is a permanent magnet for forming the magnetic circuit, formed into a ring shape and placed on the base portion 11 of the yoke 10.
  • the plate 30 is a ferromagnetic material for forming the magnetic circuit, formed into a ring shape and placed on the magnet 20.
  • the yoke 10, magnet 20, and plate 30 form an external magnetic type magnetic circuit.
  • the frame 40 is formed in a roughly circular ring shape and is supported by the mounting portion 90 shown in FIG. 1.
  • the frame 40 comprises a first frame portion 41 that supports the tinsel wire integrated damper 50 on the radial inside of the pole portion 12, and a second frame portion 42 that supports the diaphragm 70 on the radial outside of the pole portion 12. Both the first frame portion 41 and the second frame portion 42 are supported by the mounting portion 90, and the first frame portion 41 is further supported (placed) by the plate 30.
  • the tinsel wire-integrated damper 50 is a flexible thin-plate annular member that supports the voice coil bobbin 60, as shown in FIG. 4.
  • the tinsel wire-integrated damper 50 includes a damper 51 and a tinsel wire 52, as shown in FIG. 5.
  • the damper 51 has a ripple-like corrugation portion.
  • the outer edge side of the damper 51 is attached to the first frame portion 41, and the inner edge side of the damper 51 is attached to the outer circumferential surface of the voice coil bobbin 60.
  • the tinsel wire 52 is a strip-shaped lead wire that extends radially along one side of the damper 51 and is woven into the damper 51 to form an integral part with the damper 51.
  • the voice coil bobbin 60 comprises a bobbin body 61, a voice coil 62, and a conductor 63.
  • the bobbin body 61 is a bobbin for winding the wire that constitutes the voice coil 62, and is formed in a cylindrical shape.
  • the voice coil 62 is wound around the other end (winding point) of the bobbin body 61.
  • the bobbin body 61 is located in the magnetic gap of the external magnetic circuit that is composed of the yoke 10, the magnet 20, and the plate 30.
  • the material of the bobbin body 61 can be, for example, a resin material such as polyimide (PI), a paper material such as craft paper, or a metal material such as an aluminum alloy.
  • the bobbin body 61 is arranged so that the pole part 12 of the yoke 10 is inserted into the cylindrical interior H.
  • Both ends of the voice coil 62 are connected to the conductors 63.
  • One method of connection is welding using solder.
  • the conductors 63 are connected to one end of the tinsel wire 52, and are provided in a pair with point symmetry centered on the axis A when viewed from the axial direction of the bobbin body 61. In other words, the conductors 63 are provided in a pair with 180° rotational symmetry about the axis A.
  • the diaphragm 70 is configured to vibrate due to the vibration of the voice coil bobbin 60, and is formed in a generally annular shape centered on the voice coil bobbin 60 in the radial direction of the voice coil bobbin 60.
  • the diaphragm 70 comprises a main body portion 71 and a pair of avoidance portions 72 (72A, 72B).
  • the inner edge portion of the diaphragm 70 is connected to the voice coil bobbin 60 (i.e., abutting against the outer peripheral surface of the voice coil bobbin 60).
  • the inner edge portion of the diaphragm 70 is fixed to the voice coil bobbin 60, for example, by adhesive.
  • the outer edge portion of the diaphragm 70 is supported by the second frame portion 42 via the edge portion 73.
  • the main body 71 has an inclined portion 71a and a bent portion 71b.
  • the inclined portion 71a is formed in a cone shape (approximately a truncated cone shape) close to a flat plate.
  • the inclined portion 71a is inclined to one side from a first inner edge portion I1, which is part of the inner edge portion of the diaphragm 70.
  • the inclined portion 71a extends radially toward the outside in the radial direction of the voice coil bobbin 60.
  • the bent portion 71b is formed in a ring shape from the outer edge of the inclined portion 71a, and is bent in the axial direction toward the tinsel wire-integrated damper 50 side (the other side) and extends to the outer periphery.
  • the bending angle of the bent portion 71b toward the other side with respect to the axial direction is acuter than the inclination angle of the inclined portion 71a.
  • the avoidance portion 72A is shaped to avoid the joint X between the tinsel wire 52 and the conductor 63 on the diaphragm 71.
  • the joint between the tinsel wire 52 and the conductor 63 is performed by soldering
  • the joint X is a solder portion.
  • the avoidance portion 72A is shaped to extend radially from a second inner edge portion I2, which is part of the inner edge of the diaphragm 70 and is located on one side of the joint X, to the inclined portion 71a.
  • the avoidance portion 72B has a similar configuration to the avoidance portion 72A.
  • the avoidance portion 72A and the avoidance portion 72B are provided so as to be point symmetrical (i.e., rotationally symmetrical) with respect to the center of the voice coil bobbin 60 in the radial direction of the voice coil bobbin 60 in correspondence with the conductor 63 described above. That is, as shown in FIG. 4, the avoidance portion 72 (72A, 72B) is rotationally symmetrical at equal angles with respect to the axis A of the voice coil bobbin 60, in other words, plane symmetrical with respect to a plane passing through the axis A of the voice coil bobbin 60, and in other words, point symmetrical with respect to a plane perpendicular to the axis A of the voice coil bobbin 60.
  • the second inner edge portion I2 in the avoidance portion 72A and the avoidance portion 72B is substantially trapezoidal in shape, convex on one side.
  • the avoidance portion 72A and the avoidance portion 72B include a pair of side wall portions 72a and a top plate portion 72b provided at one end of the pair of side wall portions 72a.
  • the pair of side wall portions 72a and the top plate portion 72b each form an obtuse angle.
  • At least the top plate portion 72b of the avoidance portions 72A and 72B is positioned on one side of the joint portion X on the circumferential surface of the voice coil bobbin 60, and is shaped to cover the joint portion X, thereby avoiding the joint portion X.
  • the inner periphery of the edge portion 73 is attached to one side of the bent portion 71b, and the outer periphery has a semicircular cross section that is convex toward one side in the axial direction (i.e., the side opposite the bending direction of the bent portion 71b), and the outer edge is attached to the second frame portion 42.
  • the cap 80 is provided to cover the voice coil bobbin 60 at one end of the voice coil bobbin 60 in order to prevent dust from entering the inside of the voice coil bobbin 60.
  • the cap 80 is generally formed in a flange shape, and includes an insertion portion 81 that is inserted into the inside of the voice coil bobbin 60, and a cover portion 82 that is provided to protrude from the outer circumferential surface of the insertion portion 81 in a plane direction perpendicular to the axial direction of the voice coil bobbin 60.
  • the cover portion 82 is provided so as to have a gap between the avoidance portion 72A and the avoidance portion 72B in the axial direction of the voice coil bobbin 60.
  • the cap 80 has a recess D recessed on the other axial side so as to be inserted into the inside of the voice coil bobbin 60.
  • the mounting portion 90 has three mounting portions 91 (91A, 91B, 91C).
  • a through hole h is formed in each mounting portion 91 (91A, 91B, 91C).
  • the through hole h is a mounting hole for mounting the speaker unit 1 to a cabinet provided in the vehicle with a bolt.
  • the speaker unit 1 of the present embodiment includes the cylindrical voice coil bobbin 60 around which the voice coil 62 is wound, the tinsel wire 52 joined to the conductor 63 connected to the voice coil 62 on the circumferential surface of the voice coil bobbin 60, and the diaphragm 70 on which the avoidance portion 72 (72A, 72B) is formed to avoid the joint portion X between the tinsel wire 52 and the conductor 63. Therefore, even if the conductor 63 is joined to the circumferential surface of the voice coil bobbin 60 in the manufacturing process of the speaker unit 1, the diaphragm 70 can be attached to the voice coil bobbin 60 while avoiding interference from the joint portion X.
  • the diaphragm 70 as a whole can be brought closer to the tinsel wire-integrated damper 50 side, and the voice coil bobbin 60 can be shortened in the axial direction.
  • the avoidance portion 72 72A, 72B is formed on the diaphragm 70, rather than cutting out a part of the diaphragm 70 or making the inner edge portion flat, thereby ensuring the rigidity of the diaphragm 70. Therefore, the speaker unit 1 realizes a thin overall unit while suppressing a decrease in the rigidity of the diaphragm 70.
  • avoidance portions 72 (72A, 72B) are newly formed while the main body portion 71 of the diaphragm 70 has the inclined portion 71a, it is possible to avoid poor acoustic characteristics due to inefficient vibration propagation in the diaphragm 70 (for example, anti-resonance due to divided vibration).
  • damper 51 that supports the voice coil bobbin 60 and attaching the tinsel wire 52 to the damper 51, there is no need to reserve space to place the tinsel wire 52, making it easier to make the entire unit thinner.
  • the diaphragm 70 also has an inclined portion 71a that inclines to one side from a first inner edge portion I1, which is a part of the inner edge portion that is connected to the voice coil bobbin 60, and the avoidance portion 72 (72A, 72B) is shaped so that it is connected to the inclined portion 71a from a second inner edge portion I2, which is a part of this inner edge portion and is located on one side of the joint X.
  • the first inner edge portion I1 of the inclined portion 71a and the second inner edge portion I2 of the avoidance portion 72 (72A, 72B) are connected to the voice coil bobbin 60, thereby making it possible to strengthen the connection with the voice coil 62.
  • the avoidance portions 72 are rotationally symmetric at equal angles with respect to the axis A of the voice coil bobbin 60, plane-symmetric with respect to a plane passing through the axis A of the voice coil bobbin 60, and point-symmetric with respect to a plane perpendicular to the axis A of the voice coil bobbin 60. This makes it possible to make the vibration propagation efficiency uniform throughout the diaphragm 70, thereby avoiding poor acoustic characteristics.
  • the inner edge of the diaphragm 70 is formed along the outer circumferential surface of the voice coil bobbin 60. This allows the vibrations of the voice coil bobbin 60 to be transmitted to the diaphragm 70 from the entire outer periphery of the voice coil bobbin 60, allowing the diaphragm 70 to vibrate efficiently overall.
  • the speaker unit 1 further includes a cap 80 that is provided to cover the voice coil bobbin 60 on one side.
  • the cap 80 includes an insertion portion 81 that is inserted into the cylindrical interior H of the voice coil bobbin 60, and a cover portion 82 that is provided to protrude from the peripheral surface of the insertion portion 81 in the radial direction of the voice coil bobbin 60.
  • the cover portion 82 is provided to have a gap between the avoidance portion 72 (72A, 72B) in the axial direction of the voice coil bobbin 60.
  • a gap is formed between the cap 80 and the portion of the diaphragm 70 where the avoidance portion 72 (72A, 72B) is formed and the portion of the diaphragm 70 where the avoidance portion 72 (72A, 72B) is not formed. Therefore, a gap is formed between the entire circumference of the inner edge of the diaphragm 70 and the cap 80. Then, by applying an adhesive to this gap, the voice coil bobbin 60 can be connected to the diaphragm 70 over the entire circumference of the inner edge. As a result, deterioration of acoustic characteristics can be suppressed.
  • the second inner edge I2 of the diaphragm 70 has a convex shape on one side in the axial direction of the voice coil bobbin 60 in the portion where the avoidance portion 72 (72A, 72B) is formed, thereby increasing the rigidity of the diaphragm 70 in the vicinity of the avoidance portion 72 (72A, 72B).
  • the speaker unit 1 further includes a damper 51 that supports the voice coil bobbin 60, and a bent portion 71b is formed on the outer edge of the diaphragm 70, which is bent toward the damper 51 in the axial direction of the voice coil bobbin 60.
  • a bent portion 71b is formed on the outer edge of the diaphragm 70, which is bent toward the damper 51 in the axial direction of the voice coil bobbin 60.
  • the cap 80 of the speaker unit 1 has a recess D recessed on the other axial side so that it can be inserted into the cylindrical interior H of the voice coil bobbin 60, allowing the speaker unit 1 to be made thinner.
  • the avoidance portions 72 are rotationally symmetric at equal angles with respect to the axis A of the voice coil bobbin 60, plane-symmetric with respect to a plane passing through the axis A of the voice coil bobbin 60, and point-symmetric with respect to a plane perpendicular to the axis A of the voice coil bobbin 60.
  • the avoidance portions 72 (72A, 72B) are at least one of the rotationally symmetric, plane-symmetric, and point-symmetric, it is possible to make the vibration propagation efficiency uniform throughout the diaphragm 70, and to avoid poor acoustic characteristics.
  • a pair of avoidance parts 72 (72A, 72B) are provided point symmetrically with respect to the center of the voice coil bobbin 60, but the number and arrangement of the avoidance parts 72 are not limited to this.
  • the number of avoidance parts 72 may be at least the same as the number of joints X in the voice coil bobbin 60, and there may be one avoidance part 72 or three or more avoidance parts 72.
  • the avoidance parts 72 are preferably arranged in a rotationally symmetric relationship including point symmetry as in the above embodiment.
  • avoidance parts 72 are preferably arranged at 120 degree intervals in the circumferential direction with respect to the center of the voice coil bobbin 60, and when four avoidance parts 72 are provided, they are preferably arranged at 90 degree intervals in the circumferential direction with respect to the center of the voice coil bobbin 60.
  • the inner edge portion (second inner edge portion I2) of the avoidance portion 72 (72A, 72B) has a substantially trapezoidal shape, but the shape of the second inner edge portion I2 is not limited to this.
  • the second inner edge portion I2 may be semicircular, triangular, or rectangular.
  • the magnetic circuit of the speaker unit 1 is an external magnet type magnetic circuit, but the present disclosure is also applicable to an internal magnet type magnetic circuit.
  • a voice coil bobbin around which a voice coil is wound A tinsel wire joined to a conductor connected to the voice coil on a peripheral surface of the voice coil bobbin; A diaphragm having an avoidance portion formed in a shape that avoids the joint between the tinsel wire and the conductor.
  • a damper supporting the voice coil bobbin is further provided. The speaker unit according to [1] above, wherein the tinsel wire is attached to the damper.
  • the diaphragm has an inclined portion inclined from a first inner edge portion, which is a part of an inner edge portion connected to the voice coil bobbin, to one side in an axial direction of the voice coil bobbin,
  • a cap is provided to cover the voice coil bobbin on one axial side of the voice coil bobbin,
  • the cap includes a cover portion provided so as to protrude from an outer circumferential surface of the voice coil bobbin,
  • the speaker unit according to any one of the above [1] to [5], wherein the cover portion is arranged so as to have a gap between the cover portion and the avoidance portion in the axial direction of the voice coil bobbin.
  • a damper supporting the voice coil bobbin is further provided.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

This speaker unit 1 comprises: a voice coil bobbin 60 around which a voice coil 62 is wound; a tinsel wire 61 that is joined, on the circumferential surface of the voice coil bobbin 60, to an electrical conductor 63 that is connected to the voice coil 62; and a diaphragm 70 in which is formed an avoidance part 72 (72A, 72B) that is shaped so as to bypass a junction X of the tinsel wire 61 and the electrical conductor 63. The speaker unit 1 furthermore comprises a damper 51 that supports the voice coil bobbin 60, the tinsel wire 52 being attached to the damper 51.

Description

スピーカユニットSpeaker unit
　本開示は、スピーカユニットに関する。 This disclosure relates to a speaker unit.
　スピーカユニットは、例えば下記特許文献１に記載のように、磁気回路と、ボイスコイルが巻回されたボイスコイルボビンと、ボイスコイルに接続された信号伝達回路と、ボイスコイルボビンの周面に取り付けられた振動板とを備えている。スピーカユニットにおいては、信号伝達回路からボイスコイルに信号が伝達されるとボイスコイルが振動し、ボイスコイルの振動がボイスコイルボビンを介して振動板に伝達されるようになっている。 As described in Patent Document 1 below, for example, a speaker unit includes a magnetic circuit, a voice coil bobbin around which a voice coil is wound, a signal transmission circuit connected to the voice coil, and a diaphragm attached to the peripheral surface of the voice coil bobbin. In the speaker unit, when a signal is transmitted from the signal transmission circuit to the voice coil, the voice coil vibrates, and the vibration of the voice coil is transmitted to the diaphragm via the voice coil bobbin.
特開２０２２－１２０６９１号公報JP 2022-120691 A
　例えば車載用等のスピーカユニットでは限られたスペースに搭載するため、スピーカユニット全体としての薄型化が望まれている。しかし、スピーカユニットの製造工程において、信号伝達回路としての導電体をボイスコイルボビンの周面に半田付け等で接合させるが、この接合部が同じくボイスコイルボビンに取り付けられる振動板と干渉するおそれがある。このような接合部と振動板との干渉を回避するために接合部と振動板の取付部との間隔を大きくすると、スピーカユニットの大型化を招いてしまう。また、振動板を薄型化（平板化）すると振動板の剛性を低下させることになる。 For example, in-car speaker units need to be mounted in a limited space, so it is desirable to make the speaker unit as a whole thinner. However, in the manufacturing process of the speaker unit, the conductor that serves as the signal transmission circuit is joined to the periphery of the voice coil bobbin by soldering or the like, but this joint may interfere with the diaphragm that is also attached to the voice coil bobbin. If the distance between the joint and the mounting part of the diaphragm is increased in order to avoid such interference between the joint and the diaphragm, this will result in an increase in the size of the speaker unit. Furthermore, making the diaphragm thinner (flatter) will reduce the rigidity of the diaphragm.
　本開示は、このような問題点を解決するためになされたもので、その目的とするところは、振動板の剛性低下を抑えつつ、ユニット全体の薄型化を実現可能なスピーカユニットを提供することにある。 This disclosure has been made to solve these problems, and its purpose is to provide a speaker unit that can achieve a thin overall unit while minimizing the loss of rigidity in the diaphragm.
　本開示に係るスピーカユニットは、ボイスコイルが巻回されたボイスコイルボビンと、前記ボイスコイルに接続された導電体に対して前記ボイスコイルボビンの周面にて接合された錦糸線と、前記錦糸線と前記導電体との接合部を回避する形状の回避部が形成された振動板と、を備える。 The speaker unit according to the present disclosure includes a voice coil bobbin around which a voice coil is wound, a tinsel wire joined to a conductor connected to the voice coil on the circumferential surface of the voice coil bobbin, and a diaphragm having an avoidance portion formed in a shape that avoids the joint between the tinsel wire and the conductor.
　上記手段を用いる本開示に係るスピーカユニットによれば、振動板の剛性低下を抑えつつ、ユニット全体として薄型化を実現可能なものとすることができる。 The speaker unit disclosed herein uses the above-mentioned means to prevent a decrease in the rigidity of the diaphragm while making it possible to achieve a thin overall unit.
本開示の一実施形態に係るスピーカユニットの斜視図である。FIG. 1 is a perspective view of a speaker unit according to an embodiment of the present disclosure. 本開示の一実施形態に係るスピーカユニットの平面図である。FIG. 1 is a plan view of a speaker unit according to an embodiment of the present disclosure. 本開示の一実施形態に係るスピーカユニットの底面図である。FIG. 2 is a bottom view of the speaker unit according to an embodiment of the present disclosure. 本開示の一実施形態に係るスピーカユニットの、図２に示すＡ－Ａ線に沿った端面図である。3 is an end view of the speaker unit according to the embodiment of the present disclosure taken along line AA shown in FIG. 2. 図４に示す接合部Ｘの付近における構成を説明するための模式拡大端面図である。5 is a schematic enlarged end view for explaining a configuration in the vicinity of a joint X shown in FIG. 4. 本開示の一実施形態に係るスピーカユニットに備わっている振動板の斜視図である。1 is a perspective view of a diaphragm provided in a speaker unit according to an embodiment of the present disclosure.
　以下、本開示の実施形態を図面に基づき説明する。 The following describes an embodiment of the present disclosure with reference to the drawings.
（スピーカユニットの構成）
　まず、本開示の一実施形態に係るスピーカユニット１の構成について説明する。図４～図６において、一側とは、ボイスコイルボビン６０の軸線方向における一方側を意味しており、他側とは、ボイスコイルボビン６０の軸線方向における他方側を意味している。ボイスコイルボビン６０の軸線については符号Ａにより示している。また、ボイスコイルボビン６０の軸線方向に直交する面方向にはボイスコイルボビン６０の径方向が含まれる。 (Speaker unit configuration)
First, the configuration of a speaker unit 1 according to an embodiment of the present disclosure will be described. In Fig. 4 to Fig. 6, one side means one side in the axial direction of the voice coil bobbin 60, and the other side means the other side in the axial direction of the voice coil bobbin 60. The axis of the voice coil bobbin 60 is indicated by the symbol A. In addition, the planar direction perpendicular to the axial direction of the voice coil bobbin 60 includes the radial direction of the voice coil bobbin 60.
　図１及び図４に記載のように、スピーカユニット１は、例えば車両のドアにおけるベースボックスに搭載される車載スピーカであり、ヨーク１０と、マグネット２０と、プレート３０と、フレーム４０と、錦糸線一体型ダンパ５０と、ボイスコイルボビン６０と、振動板７０と、エッジ部７３と、キャップ８０と、取付部９０とを備えている。なお、図１は、キャップ８０を外した状態を示している。 As shown in Figures 1 and 4, the speaker unit 1 is an in-vehicle speaker that is mounted, for example, on a base box in the door of a vehicle, and includes a yoke 10, a magnet 20, a plate 30, a frame 40, a tinsel wire-integrated damper 50, a voice coil bobbin 60, a diaphragm 70, an edge portion 73, a cap 80, and an attachment portion 90. Note that Figure 1 shows the state with the cap 80 removed.
　図４に示すように、ヨーク１０（継鉄）は、磁気回路を構成するための強磁性体であり、薄型円盤状の土台部１１と、土台部１１の径方向中心から一側に突出する円柱状のポール部１２とを備えている。マグネット２０は、磁気回路を構成するための永久磁石であり、環状に形成されてヨーク１０の土台部１１に載置されている。プレート３０は、磁気回路を構成するための強磁性体であり、環状に形成されてマグネット２０に載置されている。ヨーク１０とマグネット２０とプレート３０とによって外磁型磁気回路が構成されている。 As shown in FIG. 4, the yoke 10 (yoke) is a ferromagnetic material for forming a magnetic circuit, and includes a thin, disk-shaped base portion 11 and a cylindrical pole portion 12 that protrudes to one side from the radial center of the base portion 11. The magnet 20 is a permanent magnet for forming the magnetic circuit, formed into a ring shape and placed on the base portion 11 of the yoke 10. The plate 30 is a ferromagnetic material for forming the magnetic circuit, formed into a ring shape and placed on the magnet 20. The yoke 10, magnet 20, and plate 30 form an external magnetic type magnetic circuit.
　フレーム４０は、概略円環状に形成されて図１に示す取付部９０に支持されている。フレーム４０は、ポール部１２の径方向内側において錦糸線一体型ダンパ５０を支持する第１フレーム部４１と、ポール部１２の径方向外側において振動板７０を支持する第２フレーム部４２とを備えている。第１フレーム部４１と第２フレーム部４２とは共に取付部９０に支持されており、第１フレーム部４１はさらにプレート３０にも支持（載置）されている。 The frame 40 is formed in a roughly circular ring shape and is supported by the mounting portion 90 shown in FIG. 1. The frame 40 comprises a first frame portion 41 that supports the tinsel wire integrated damper 50 on the radial inside of the pole portion 12, and a second frame portion 42 that supports the diaphragm 70 on the radial outside of the pole portion 12. Both the first frame portion 41 and the second frame portion 42 are supported by the mounting portion 90, and the first frame portion 41 is further supported (placed) by the plate 30.
　錦糸線一体型ダンパ５０は、図４に示すように、ボイスコイルボビン６０を支持する可撓性の薄板環状部材である。錦糸線一体型ダンパ５０は、図５に示すように、ダンパ５１と錦糸線５２とを備えている。ダンパ５１には、波紋状のコルゲーション部が形成されている。ダンパ５１の外縁側は第１フレーム部４１に取り付けられており、ダンパ５１の内縁側はボイスコイルボビン６０の外周面に取り付けられている。錦糸線５２は、ダンパ５１の一側面に沿って径方向に延びた帯状のリード線であって、ダンパ５１に編み込まれてダンパ５１と一体をなしている。 The tinsel wire-integrated damper 50 is a flexible thin-plate annular member that supports the voice coil bobbin 60, as shown in FIG. 4. The tinsel wire-integrated damper 50 includes a damper 51 and a tinsel wire 52, as shown in FIG. 5. The damper 51 has a ripple-like corrugation portion. The outer edge side of the damper 51 is attached to the first frame portion 41, and the inner edge side of the damper 51 is attached to the outer circumferential surface of the voice coil bobbin 60. The tinsel wire 52 is a strip-shaped lead wire that extends radially along one side of the damper 51 and is woven into the damper 51 to form an integral part with the damper 51.
　ボイスコイルボビン６０は、ボビン本体６１と、ボイスコイル６２と、導電体６３とを備えている。ボビン本体６１は、ボイスコイル６２をなす線材を巻き付けるためのボビンであって筒状に形成されている。ボビン本体６１の他側端部（巻付箇所）においてボイスコイル６２が巻回されている。ボビン本体６１は、ヨーク１０とマグネット２０とプレート３０とによって構成されている外磁型磁気回路の磁気ギャップに位置している。なお、ボビン本体６１の材料としては、例えば、ポリイミド（ＰＩ）等の樹脂材料、クラフト紙等の紙材料、又はアルミニウム合金等の金属材料を用いることができる。ボビン本体６１は、その筒内Ｈにヨーク１０のポール部１２が挿入されるように配置されている。 The voice coil bobbin 60 comprises a bobbin body 61, a voice coil 62, and a conductor 63. The bobbin body 61 is a bobbin for winding the wire that constitutes the voice coil 62, and is formed in a cylindrical shape. The voice coil 62 is wound around the other end (winding point) of the bobbin body 61. The bobbin body 61 is located in the magnetic gap of the external magnetic circuit that is composed of the yoke 10, the magnet 20, and the plate 30. The material of the bobbin body 61 can be, for example, a resin material such as polyimide (PI), a paper material such as craft paper, or a metal material such as an aluminum alloy. The bobbin body 61 is arranged so that the pole part 12 of the yoke 10 is inserted into the cylindrical interior H.
　ボイスコイル６２の両端部は導電体６３に接続されている。接続方法としては、例えば半田を用いた溶接が挙げられる。導電体６３は、錦糸線５２の一端が接続されており、ボビン本体６１の軸線方向から見て軸線Ａを中心とした点対称に一対に設けられている。つまり、導電体６３は、軸線Ａに対して１８０°回転対称に一対に設けられている。 Both ends of the voice coil 62 are connected to the conductors 63. One method of connection is welding using solder. The conductors 63 are connected to one end of the tinsel wire 52, and are provided in a pair with point symmetry centered on the axis A when viewed from the axial direction of the bobbin body 61. In other words, the conductors 63 are provided in a pair with 180° rotational symmetry about the axis A.
　振動板７０は、ボイスコイルボビン６０の振動によって振動するように構成されており、ボイスコイルボビン６０の径方向においてボイスコイルボビン６０を中心とする略環状に形成されている。振動板７０は、本体部７１と、一対の回避部７２（７２Ａ、７２Ｂ）とを備えている。振動板７０の内縁部は、ボイスコイルボビン６０と接続されている（つまり、ボイスコイルボビン６０の外周面と当接している）。振動板７０の内縁部は、例えば接着剤によって、ボイスコイルボビン６０に固定されている。振動板７０の外縁部は、エッジ部７３を介して第２フレーム部４２に支持されている。 The diaphragm 70 is configured to vibrate due to the vibration of the voice coil bobbin 60, and is formed in a generally annular shape centered on the voice coil bobbin 60 in the radial direction of the voice coil bobbin 60. The diaphragm 70 comprises a main body portion 71 and a pair of avoidance portions 72 (72A, 72B). The inner edge portion of the diaphragm 70 is connected to the voice coil bobbin 60 (i.e., abutting against the outer peripheral surface of the voice coil bobbin 60). The inner edge portion of the diaphragm 70 is fixed to the voice coil bobbin 60, for example, by adhesive. The outer edge portion of the diaphragm 70 is supported by the second frame portion 42 via the edge portion 73.
　本体部７１は、傾斜部７１ａと屈曲部７１ｂとを備えている。傾斜部７１ａは平板状に近いコーン形状（略円錐台形状）に形成されている。傾斜部７１ａは、振動板７０の内縁部の一部である第１内縁部Ｉ１から一側に傾斜している。傾斜部７１ａは、ボイスコイルボビン６０の径方向外側に向かって放射状に延在している。屈曲部７１ｂは、傾斜部７１ａの外縁から環状に形成されており、軸線方向において錦糸線一体型ダンパ５０側（他側）に向かって屈曲して外周側に延びている。屈曲部７１ｂの軸線方向に対する他側への屈曲角度は傾斜部７１ａの傾斜角度よりも鋭角である。 The main body 71 has an inclined portion 71a and a bent portion 71b. The inclined portion 71a is formed in a cone shape (approximately a truncated cone shape) close to a flat plate. The inclined portion 71a is inclined to one side from a first inner edge portion I1, which is part of the inner edge portion of the diaphragm 70. The inclined portion 71a extends radially toward the outside in the radial direction of the voice coil bobbin 60. The bent portion 71b is formed in a ring shape from the outer edge of the inclined portion 71a, and is bent in the axial direction toward the tinsel wire-integrated damper 50 side (the other side) and extends to the outer periphery. The bending angle of the bent portion 71b toward the other side with respect to the axial direction is acuter than the inclination angle of the inclined portion 71a.
　回避部７２Ａは、振動板７１において、錦糸線５２と導電体６３との接合部Ｘを回避する形状をなしている。本実施形態では錦糸線５２と導電体６３との接合は半田付けで行われており、接合部Ｘは半田部分となる。具体的には、図５に示すように、回避部７２Ａは、振動板７０の内縁部の一部であり接合部Ｘよりも一側に位置する第２内縁部Ｉ２から、ボイスコイルボビン６０の径方向に延在して傾斜部７１ａに接続された形状をなしている。回避部７２Ｂは、回避部７２Ａと同様の構成となっている。 The avoidance portion 72A is shaped to avoid the joint X between the tinsel wire 52 and the conductor 63 on the diaphragm 71. In this embodiment, the joint between the tinsel wire 52 and the conductor 63 is performed by soldering, and the joint X is a solder portion. Specifically, as shown in FIG. 5, the avoidance portion 72A is shaped to extend radially from a second inner edge portion I2, which is part of the inner edge of the diaphragm 70 and is located on one side of the joint X, to the inclined portion 71a. The avoidance portion 72B has a similar configuration to the avoidance portion 72A.
　回避部７２Ａと回避部７２Ｂとは、上述した導電体６３と対応するように、ボイスコイルボビン６０の径方向においてボイスコイルボビン６０の中心に対して点対称（つまり、ボイスコイルボビン６０の回転対称）となるように設けられている。つまり、図４に示すように、回避部７２（７２Ａ、７２Ｂ）は、ボイスコイルボビン６０の軸線Ａに対して均等な角度で回転対称となっており、言い換えればボイスコイルボビン６０の軸線Ａを通る平面に対して面対称となっており、さらに言い換えればボイスコイルボビン６０の軸線Ａに垂直な平面において点対称となっている。回避部７２Ａと回避部７２Ｂとにおける第２内縁部Ｉ２は、一側に凸の略台形形状となっている。具体的には、回避部７２Ａ及び回避部７２Ｂは、一対の側壁部７２ａと、一対の側壁部７２ａの一側端部に設けられる天板部７２ｂとを備えている。一対の側壁部７２ａと天板部７２ｂとはそれぞれ鈍角を形成している。 The avoidance portion 72A and the avoidance portion 72B are provided so as to be point symmetrical (i.e., rotationally symmetrical) with respect to the center of the voice coil bobbin 60 in the radial direction of the voice coil bobbin 60 in correspondence with the conductor 63 described above. That is, as shown in FIG. 4, the avoidance portion 72 (72A, 72B) is rotationally symmetrical at equal angles with respect to the axis A of the voice coil bobbin 60, in other words, plane symmetrical with respect to a plane passing through the axis A of the voice coil bobbin 60, and in other words, point symmetrical with respect to a plane perpendicular to the axis A of the voice coil bobbin 60. The second inner edge portion I2 in the avoidance portion 72A and the avoidance portion 72B is substantially trapezoidal in shape, convex on one side. Specifically, the avoidance portion 72A and the avoidance portion 72B include a pair of side wall portions 72a and a top plate portion 72b provided at one end of the pair of side wall portions 72a. The pair of side wall portions 72a and the top plate portion 72b each form an obtuse angle.
　このようにして回避部７２Ａ、７２Ｂは少なくとも天板部７２ｂがボイスコイルボビン６０の周面において接合部Ｘよりも一側に位置して、接合部Ｘを覆う形状をなすことで当該接合部Ｘを回避している。 In this way, at least the top plate portion 72b of the avoidance portions 72A and 72B is positioned on one side of the joint portion X on the circumferential surface of the voice coil bobbin 60, and is shaped to cover the joint portion X, thereby avoiding the joint portion X.
　エッジ部７３は、内周側が屈曲部７１ｂの一側面と貼り付けられており、外周側は軸線方向一側（つまり、屈曲部７１ｂの屈曲方向とは反対側）に向かって凸の断面半円状をなして、外縁端が第２フレーム部４２に取り付けられている。 The inner periphery of the edge portion 73 is attached to one side of the bent portion 71b, and the outer periphery has a semicircular cross section that is convex toward one side in the axial direction (i.e., the side opposite the bending direction of the bent portion 71b), and the outer edge is attached to the second frame portion 42.
　キャップ８０は、ボイスコイルボビン６０の筒内Ｈへのダストの侵入を防止するために、ボイスコイルボビン６０の一側端部においてボイスコイルボビン６０を覆うように設けられる。キャップ８０は、全体的にはフランジ状に形成されており、ボイスコイルボビン６０の内部に挿入される挿入部８１と、ボイスコイルボビン６０の軸線方向に直交する面方向に挿入部８１の外周面から突出するように設けられるカバー部８２とを備えている。カバー部８２は、ボイスコイルボビン６０の軸線方向において回避部７２Ａ及び回避部７２Ｂとの間に隙間を有するように設けられる。キャップ８０は、ボイスコイルボビン６０の筒内Ｈに挿入されるように軸方向他側に凹んだ凹部Ｄを備えている。 The cap 80 is provided to cover the voice coil bobbin 60 at one end of the voice coil bobbin 60 in order to prevent dust from entering the inside of the voice coil bobbin 60. The cap 80 is generally formed in a flange shape, and includes an insertion portion 81 that is inserted into the inside of the voice coil bobbin 60, and a cover portion 82 that is provided to protrude from the outer circumferential surface of the insertion portion 81 in a plane direction perpendicular to the axial direction of the voice coil bobbin 60. The cover portion 82 is provided so as to have a gap between the avoidance portion 72A and the avoidance portion 72B in the axial direction of the voice coil bobbin 60. The cap 80 has a recess D recessed on the other axial side so as to be inserted into the inside of the voice coil bobbin 60.
　取付部９０は、３つの取付部９１（９１Ａ、９１Ｂ、９１Ｃ）を備えている。それぞれの取付部９１（９１Ａ、９１Ｂ、９１Ｃ）には貫通孔ｈが形成されている。貫通孔ｈは、車両に設けられるキャビネットにスピーカユニット１をボルトにより取り付けるための取付穴である。 The mounting portion 90 has three mounting portions 91 (91A, 91B, 91C). A through hole h is formed in each mounting portion 91 (91A, 91B, 91C). The through hole h is a mounting hole for mounting the speaker unit 1 to a cabinet provided in the vehicle with a bolt.
（スピーカユニットの動作）
　信号伝達回路から錦糸線５２及び導電体６３を介してボイスコイル６２に電力が供給されると、ボイスコイル６２に電磁力が発生し、磁気回路との関係からボイスコイル６２が振動する。この振動がボイスコイル６２からボビン本体６１を介して振動板７０に伝達する。これにより、振動板７０から音が発生する。なお、振動板７０の振動方向は、ボイスコイルボビン６０の軸線方向と同一となる。 (Speaker unit operation)
When power is supplied to the voice coil 62 from the signal transmission circuit via the tinsel wire 52 and the conductor 63, an electromagnetic force is generated in the voice coil 62, and the voice coil 62 vibrates due to its relationship with the magnetic circuit. This vibration is transmitted from the voice coil 62 to the diaphragm 70 via the bobbin body 61. As a result, sound is generated from the diaphragm 70. The vibration direction of the diaphragm 70 is the same as the axial direction of the voice coil bobbin 60.
（スピーカユニットの効果）
　以上のように本実施形態のスピーカユニット１は、ボイスコイル６２が巻回された筒状のボイスコイルボビン６０と、ボイスコイル６２に接続された導電体６３に対してボイスコイルボビン６０の周面にて接合された錦糸線５２と、錦糸線５２と導電体６３との接合部Ｘを回避する形状の回避部７２（７２Ａ、７２Ｂ）が形成された振動板７０とを備えている。このため、スピーカユニット１の製造工程において、導電体６３をボイスコイルボビン６０の周面に接合させても、接合部Ｘからの干渉を回避して振動板７０をボイスコイルボビン６０に取り付けることができる。つまり、振動板７０全体として錦糸線一体型ダンパ５０側に近づけてボイスコイルボビン６０の軸線方向の短縮化が可能となる。さらに、接合部Ｘからの干渉を回避する手段として、振動板７０の一部を切り欠いたり、内縁部分を平板状にしたりするのではなく振動板７０に回避部７２（７２Ａ、７２Ｂ）を形成することで、振動板７０の剛性を確保することができる。よって、スピーカユニット１は、振動板７０の剛性低下を抑えつつユニット全体として薄型化を実現している。また、振動板７０の本体部７１における傾斜部７１ａを有しつつ回避部７２（７２Ａ、７２Ｂ）を新たに形成したため、振動板７０における振動伝播の非効率化（例えば分割振動による逆共振）に伴う音響特性不良を回避することができる。 (Speaker unit effect)
As described above, the speaker unit 1 of the present embodiment includes the cylindrical voice coil bobbin 60 around which the voice coil 62 is wound, the tinsel wire 52 joined to the conductor 63 connected to the voice coil 62 on the circumferential surface of the voice coil bobbin 60, and the diaphragm 70 on which the avoidance portion 72 (72A, 72B) is formed to avoid the joint portion X between the tinsel wire 52 and the conductor 63. Therefore, even if the conductor 63 is joined to the circumferential surface of the voice coil bobbin 60 in the manufacturing process of the speaker unit 1, the diaphragm 70 can be attached to the voice coil bobbin 60 while avoiding interference from the joint portion X. In other words, the diaphragm 70 as a whole can be brought closer to the tinsel wire-integrated damper 50 side, and the voice coil bobbin 60 can be shortened in the axial direction. Furthermore, as a means for avoiding interference from the joint portion X, the avoidance portion 72 (72A, 72B) is formed on the diaphragm 70, rather than cutting out a part of the diaphragm 70 or making the inner edge portion flat, thereby ensuring the rigidity of the diaphragm 70. Therefore, the speaker unit 1 realizes a thin overall unit while suppressing a decrease in the rigidity of the diaphragm 70. In addition, since the avoidance portions 72 (72A, 72B) are newly formed while the main body portion 71 of the diaphragm 70 has the inclined portion 71a, it is possible to avoid poor acoustic characteristics due to inefficient vibration propagation in the diaphragm 70 (for example, anti-resonance due to divided vibration).
　また、ボイスコイルボビン６０を支持するダンパ５１を備え、錦糸線５２がダンパ５１に取り付けられていることで、錦糸線５２を配置する空間を確保する必要がなく、より容易にユニット全体として薄型化を図ることができる。 Also, by providing a damper 51 that supports the voice coil bobbin 60 and attaching the tinsel wire 52 to the damper 51, there is no need to reserve space to place the tinsel wire 52, making it easier to make the entire unit thinner.
　また、振動板７０は、ボイスコイルボビン６０と接続される内縁部の一部である第１内縁部Ｉ１から一側に傾斜する傾斜部７１ａを有しており、回避部７２（７２Ａ、７２Ｂ）は、この内縁部の一部であり接合部Ｘよりも一側に位置する第２内縁部Ｉ２から傾斜部７１ａに接続された形状である。このように、傾斜部７１ａの第１内縁部Ｉ１と回避部７２（７２Ａ、７２Ｂ）の第２内縁部Ｉ２とがボイスコイルボビン６０に接続されるため、ボイスコイル６２との接続を強固にすることができる。 The diaphragm 70 also has an inclined portion 71a that inclines to one side from a first inner edge portion I1, which is a part of the inner edge portion that is connected to the voice coil bobbin 60, and the avoidance portion 72 (72A, 72B) is shaped so that it is connected to the inclined portion 71a from a second inner edge portion I2, which is a part of this inner edge portion and is located on one side of the joint X. In this way, the first inner edge portion I1 of the inclined portion 71a and the second inner edge portion I2 of the avoidance portion 72 (72A, 72B) are connected to the voice coil bobbin 60, thereby making it possible to strengthen the connection with the voice coil 62.
　また、回避部７２（７２Ａ、７２Ｂ）は、ボイスコイルボビン６０の軸線Ａに対して均等な角度で回転対称であり、ボイスコイルボビン６０の軸線Ａを通る平面に対して面対称であり、さらには、ボイスコイルボビン６０の軸線Ａに垂直な平面において点対称である。これにより、振動板７０の全体における振動伝播効率を均一にすることができるため、音響特性不良を回避することができる。 In addition, the avoidance portions 72 (72A, 72B) are rotationally symmetric at equal angles with respect to the axis A of the voice coil bobbin 60, plane-symmetric with respect to a plane passing through the axis A of the voice coil bobbin 60, and point-symmetric with respect to a plane perpendicular to the axis A of the voice coil bobbin 60. This makes it possible to make the vibration propagation efficiency uniform throughout the diaphragm 70, thereby avoiding poor acoustic characteristics.
　さらに、振動板７０の内縁部は、ボイスコイルボビン６０の外周面に沿って形成されている。これにより、ボイスコイルボビン６０の振動をボイスコイルボビン６０の外周全体から振動板７０に伝達することができるため、振動板７０を全体的に効率よく振動させることができる。 Furthermore, the inner edge of the diaphragm 70 is formed along the outer circumferential surface of the voice coil bobbin 60. This allows the vibrations of the voice coil bobbin 60 to be transmitted to the diaphragm 70 from the entire outer periphery of the voice coil bobbin 60, allowing the diaphragm 70 to vibrate efficiently overall.
　また、スピーカユニット１は、一側においてボイスコイルボビン６０を覆うように設けられるキャップ８０をさらに備えており、キャップ８０は、ボイスコイルボビン６０の筒内Ｈに挿入される挿入部８１と、ボイスコイルボビン６０の径方向に挿入部８１の周面から突出するように設けられるカバー部８２とを備え、カバー部８２は、ボイスコイルボビン６０の軸線方向において回避部７２（７２Ａ、７２Ｂ）との間に隙間を有するように設けられている。これにより、振動板７０の回避部７２（７２Ａ、７２Ｂ）が形成された部分及び振動板７０の回避部７２（７２Ａ、７２Ｂ）が形成されていない部分と、キャップ８０との間に隙間が形成されることになる。そのため、振動板７０の内縁の全周と、キャップ８０との間に隙間が形成される。そして、この隙間に接着剤を塗布することで、振動板７０の内縁の全周にわたって、ボイスコイルボビン６０と接続することができる。その結果、音響特性の低下を抑制することができる。 The speaker unit 1 further includes a cap 80 that is provided to cover the voice coil bobbin 60 on one side. The cap 80 includes an insertion portion 81 that is inserted into the cylindrical interior H of the voice coil bobbin 60, and a cover portion 82 that is provided to protrude from the peripheral surface of the insertion portion 81 in the radial direction of the voice coil bobbin 60. The cover portion 82 is provided to have a gap between the avoidance portion 72 (72A, 72B) in the axial direction of the voice coil bobbin 60. As a result, a gap is formed between the cap 80 and the portion of the diaphragm 70 where the avoidance portion 72 (72A, 72B) is formed and the portion of the diaphragm 70 where the avoidance portion 72 (72A, 72B) is not formed. Therefore, a gap is formed between the entire circumference of the inner edge of the diaphragm 70 and the cap 80. Then, by applying an adhesive to this gap, the voice coil bobbin 60 can be connected to the diaphragm 70 over the entire circumference of the inner edge. As a result, deterioration of acoustic characteristics can be suppressed.
　さらに、振動板７０の第２内縁部Ｉ２は、回避部７２（７２Ａ、７２Ｂ）が形成された部分においてボイスコイルボビン６０の軸線方向一側に凸の形状となっていることにより、振動板７０の回避部７２（７２Ａ、７２Ｂ）の付近における剛性を高めることができる。 Furthermore, the second inner edge I2 of the diaphragm 70 has a convex shape on one side in the axial direction of the voice coil bobbin 60 in the portion where the avoidance portion 72 (72A, 72B) is formed, thereby increasing the rigidity of the diaphragm 70 in the vicinity of the avoidance portion 72 (72A, 72B).
　スピーカユニット１は、ボイスコイルボビン６０を支持するダンパ５１をさらに備え、振動板７０の外縁側には、ボイスコイルボビン６０の軸線方向においてダンパ５１側に向かって屈曲している屈曲部７１ｂが形成されている。ところで、振動板は、コーンの傾斜がきつい程、コーンの剛性が高くなる。コーンの傾斜がきつくなると、スピーカユニットの全高が高くなってしまう。本実施形態では、屈曲部７１ｂを設けることにより、全高方向に影響を与えないで、剛性を高くすることができる。 The speaker unit 1 further includes a damper 51 that supports the voice coil bobbin 60, and a bent portion 71b is formed on the outer edge of the diaphragm 70, which is bent toward the damper 51 in the axial direction of the voice coil bobbin 60. Incidentally, the more the cone of the diaphragm is inclined, the higher the rigidity of the cone. If the cone is inclined too steeply, the overall height of the speaker unit will be increased. In this embodiment, by providing the bent portion 71b, the rigidity can be increased without affecting the overall height.
　スピーカユニット１のキャップ８０は、ボイスコイルボビン６０の筒内Ｈに挿入されるように軸方向他側に凹んだ凹部Ｄを備えていることにより、スピーカユニット１を薄型化することができる。 The cap 80 of the speaker unit 1 has a recess D recessed on the other axial side so that it can be inserted into the cylindrical interior H of the voice coil bobbin 60, allowing the speaker unit 1 to be made thinner.
（その他）
　これまで説明してきた実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものとする。 (others)
The embodiments described above can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and modifications are within the scope of the invention and its equivalents as described in the claims, as well as the scope and spirit of the invention.
　例えば、上記実施形態において、回避部７２（７２Ａ、７２Ｂ）は、ボイスコイルボビン６０の軸線Ａに対して均等な角度で回転対称であり、ボイスコイルボビン６０の軸線Ａを通る平面に対して面対称であり、かつ、ボイスコイルボビン６０の軸線Ａに垂直な平面において点対称である。しかし、回避部７２（７２Ａ、７２Ｂ）がこれら回転対称、面対称及び点対称のうちの少なくとも１つに該当すれば、振動板７０の全体における振動伝播効率を均一にすることができて音響特性不良を回避することができる。 For example, in the above embodiment, the avoidance portions 72 (72A, 72B) are rotationally symmetric at equal angles with respect to the axis A of the voice coil bobbin 60, plane-symmetric with respect to a plane passing through the axis A of the voice coil bobbin 60, and point-symmetric with respect to a plane perpendicular to the axis A of the voice coil bobbin 60. However, if the avoidance portions 72 (72A, 72B) are at least one of the rotationally symmetric, plane-symmetric, and point-symmetric, it is possible to make the vibration propagation efficiency uniform throughout the diaphragm 70, and to avoid poor acoustic characteristics.
　また、上記実施形態では、一対の回避部７２（７２Ａ、７２Ｂ）がボイスコイルボビン６０の中心に対して点対称で設けられているが、回避部７２の数や配置はこれに限られるものではない。例えば、回避部７２の数は少なくともボイスコイルボビン６０における接合部Ｘの数と同じであればよく、回避部７２が１つであっても３つ以上であってもよい。回避部７２の配置は、回避部７２を複数設ける場合は、上記実施形態のような点対称を含む回転対称の関係となる配置が好ましい。例えば回避部７２を３つ設ける場合はボイスコイルボビン６０の中心に対して周方向に１２０度間隔で配置するのが好ましく、回避部７２を４つ設ける場合はボイスコイルボビン６０の中心に対して周方向に９０度間隔で配置するのが好ましい。 In addition, in the above embodiment, a pair of avoidance parts 72 (72A, 72B) are provided point symmetrically with respect to the center of the voice coil bobbin 60, but the number and arrangement of the avoidance parts 72 are not limited to this. For example, the number of avoidance parts 72 may be at least the same as the number of joints X in the voice coil bobbin 60, and there may be one avoidance part 72 or three or more avoidance parts 72. When multiple avoidance parts 72 are provided, the avoidance parts 72 are preferably arranged in a rotationally symmetric relationship including point symmetry as in the above embodiment. For example, when three avoidance parts 72 are provided, they are preferably arranged at 120 degree intervals in the circumferential direction with respect to the center of the voice coil bobbin 60, and when four avoidance parts 72 are provided, they are preferably arranged at 90 degree intervals in the circumferential direction with respect to the center of the voice coil bobbin 60.
　また、上記実施形態では、回避部７２（７２Ａ、７２Ｂ）の内縁部（第２内縁部Ｉ２）が略台形形状をなしているが、第２内縁部Ｉ２の形状はこれに限られるものではない。例えば第２内縁部Ｉ２が半円形状、三角形状、矩形状であってもよい。 In addition, in the above embodiment, the inner edge portion (second inner edge portion I2) of the avoidance portion 72 (72A, 72B) has a substantially trapezoidal shape, but the shape of the second inner edge portion I2 is not limited to this. For example, the second inner edge portion I2 may be semicircular, triangular, or rectangular.
　上記実施形態では、スピーカユニット１の磁気回路が外磁型磁気回路であるが、本開示は内磁型磁気回路にも適用可能である。 In the above embodiment, the magnetic circuit of the speaker unit 1 is an external magnet type magnetic circuit, but the present disclosure is also applicable to an internal magnet type magnetic circuit.
　上述した実施形態に係る開示を例示すると以下のとおりである。
[１]
　ボイスコイルが巻回されたボイスコイルボビンと、
　前記ボイスコイルに接続された導電体に対して前記ボイスコイルボビンの周面にて接合された錦糸線と、
　前記錦糸線と前記導電体との接合部を回避する形状の回避部が形成された振動板と、を備えるスピーカユニット。
[２]
　前記ボイスコイルボビンを支持するダンパをさらに備え、
　前記錦糸線は前記ダンパに取り付けられている、上記[１]に記載のスピーカユニット。
[３]
　前記振動板は、前記ボイスコイルボビンと接続される内縁部の一部である第１内縁部から前記ボイスコイルボビンの軸線方向一側に傾斜する傾斜部を有し、
　前記回避部は、前記内縁部の一部であり前記接合部よりも前記ボイスコイルボビンの軸線方向一側に位置する第２内縁部から前記傾斜部に接続された形状である、上記[１]又は[２]に記載のスピーカユニット。
[４]
　前記回避部は、前記ボイスコイルボビンの軸線に対して均等な角度で回転対称となるように設けられるか、前記ボイスコイルボビンの軸線を通る平面に対して面対称となるように設けられるか、または、前記ボイスコイルボビンの軸線に垂直な平面において点対称となるように設けられている、上記[１]～[３]のいずれか１つに記載のスピーカユニット。
[５]
　前記振動板の内縁部は、前記ボイスコイルボビンの外周面に沿って形成されている、上記[１]～[４]のいずれか１つに記載のスピーカユニット。
[６]
　前記ボイスコイルボビンの軸線方向一側において前記ボイスコイルボビンを覆うように設けられるキャップをさらに備え、
　前記キャップは、前記ボイスコイルボビンの外周面から突出するように設けられるカバー部を備え、
　前記カバー部は、前記ボイスコイルボビンの軸線方向において前記回避部との間に隙間を有するように設けられる、上記[１]～[５]のいずれか１つに記載のスピーカユニット。
[７]
　前記振動板の内縁部は、前記回避部が形成された部分において前記ボイスコイルボビンの軸線方向一側に凸の形状となっている、上記[１]～[６]のいずれか１つに記載のスピーカユニット。
[８]
　前記ボイスコイルボビンを支持するダンパをさらに備え、
　前記振動板の外縁側には、前記ボイスコイルボビンの軸線方向において前記ダンパ側に向かって屈曲している屈曲部が形成されている、上記[１]～[７]のいずれか１つに記載のスピーカユニット。
[９]
　前記キャップは、前記ボイスコイルボビンの筒内に挿入されるように軸方向他側に凹んだ凹部を備えている、上記[６]に記載のスピーカユニット。 The disclosure relating to the above-mentioned embodiment is exemplified as follows.
[1]
A voice coil bobbin around which a voice coil is wound;
A tinsel wire joined to a conductor connected to the voice coil on a peripheral surface of the voice coil bobbin;
A diaphragm having an avoidance portion formed in a shape that avoids the joint between the tinsel wire and the conductor.
[2]
A damper supporting the voice coil bobbin is further provided.
The speaker unit according to [1] above, wherein the tinsel wire is attached to the damper.
[3]
the diaphragm has an inclined portion inclined from a first inner edge portion, which is a part of an inner edge portion connected to the voice coil bobbin, to one side in an axial direction of the voice coil bobbin,
The speaker unit described in [1] or [2] above, wherein the avoidance portion is a part of the inner edge portion and has a shape connected to the inclined portion from a second inner edge portion located on one side of the axial direction of the voice coil bobbin relative to the joint portion.
[4]
The speaker unit according to any one of [1] to [3] above, wherein the avoidance portion is arranged so as to be rotationally symmetric at an equal angle with respect to the axis of the voice coil bobbin, or so as to be plane-symmetric with respect to a plane passing through the axis of the voice coil bobbin, or so as to be point-symmetric with respect to a plane perpendicular to the axis of the voice coil bobbin.
[5]
The speaker unit according to any one of the above [1] to [4], wherein the inner edge of the diaphragm is formed along the outer peripheral surface of the voice coil bobbin.
[6]
A cap is provided to cover the voice coil bobbin on one axial side of the voice coil bobbin,
The cap includes a cover portion provided so as to protrude from an outer circumferential surface of the voice coil bobbin,
The speaker unit according to any one of the above [1] to [5], wherein the cover portion is arranged so as to have a gap between the cover portion and the avoidance portion in the axial direction of the voice coil bobbin.
[7]
The speaker unit according to any one of the above [1] to [6], wherein the inner edge of the diaphragm has a convex shape toward one side in the axial direction of the voice coil bobbin in the portion where the avoidance portion is formed.
[8]
A damper supporting the voice coil bobbin is further provided.
The speaker unit according to any one of the above [1] to [7], wherein a bent portion is formed on the outer edge side of the diaphragm, the bent portion being bent toward the damper side in the axial direction of the voice coil bobbin.
[9]
The speaker unit according to the above-mentioned [6], wherein the cap has a recess that is recessed on the other axial side so as to be inserted into the cylinder of the voice coil bobbin.
１　スピーカユニット
５０　錦糸線一体型ダンパ
５１　ダンパ
５２　錦糸線
６０　ボイスコイルボビン
６１　ボビン本体
６２　ボイスコイル
６３　導電体
７０　振動板
７１　本体部
７１ａ　傾斜部
７１ｂ　屈曲部
７２（７２Ａ、７２Ｂ)　回避部
８０　キャップ
８２　カバー部
Ｘ　接合部
 

  1 Speaker unit 50 Tin wire integrated damper 51 Damper 52 Tin wire 60 Voice coil bobbin 61 Bobbin body 62 Voice coil 63 Conductor 70 Diaphragm 71 Body part 71a Inclined part 71b Bent part 72 (72A, 72B) Avoidance part 80 Cap 82 Cover part X Joint part

Claims (9)

  1. 　ボイスコイルが巻回されたボイスコイルボビンと、
    　前記ボイスコイルに接続された導電体に対して前記ボイスコイルボビンの周面にて接合された錦糸線と、
    　前記錦糸線と前記導電体との接合部を回避する形状の回避部が形成された振動板と、を備えるスピーカユニット。     A voice coil bobbin around which a voice coil is wound;
    A tinsel wire joined to a conductor connected to the voice coil on a peripheral surface of the voice coil bobbin;
    A diaphragm having an avoidance portion formed in a shape that avoids the joint between the tinsel wire and the conductor.
  2. 　前記ボイスコイルボビンを支持するダンパをさらに備え、
    　前記錦糸線は前記ダンパに取り付けられている、請求項１に記載のスピーカユニット。     A damper supporting the voice coil bobbin is further provided.
    The speaker unit according to claim 1 , wherein the tinsel wire is attached to the damper.
  3. 　前記振動板は、前記ボイスコイルボビンと接続される内縁部の一部である第１内縁部から前記ボイスコイルボビンの軸線方向一側に傾斜する傾斜部を有し、
    　前記回避部は、前記内縁部の一部であり前記接合部よりも前記ボイスコイルボビンの軸線方向一側に位置する第２内縁部から前記傾斜部に接続された形状である、請求項１に記載のスピーカユニット。     the diaphragm has an inclined portion inclined from a first inner edge portion, which is a part of an inner edge portion connected to the voice coil bobbin, to one side in an axial direction of the voice coil bobbin,
    The speaker unit according to claim 1 , wherein the avoidance portion is a part of the inner edge portion and is connected to the inclined portion from a second inner edge portion located on one side of the axial direction of the voice coil bobbin relative to the joint portion.
  4. 　前記回避部は、前記ボイスコイルボビンの軸線に対して均等な角度で回転対称となるように設けられている、請求項１に記載のスピーカユニット。 The speaker unit according to claim 1, wherein the avoidance portion is provided so as to be rotationally symmetrical at equal angles with respect to the axis of the voice coil bobbin.
  5. 　前記振動板の内縁部は、前記ボイスコイルボビンの外周面に沿って形成されている、請求項１に記載のスピーカユニット。 The speaker unit of claim 1, wherein the inner edge of the diaphragm is formed along the outer periphery of the voice coil bobbin.
  6. 　前記ボイスコイルボビンの軸線方向一側において前記ボイスコイルボビンを覆うように設けられるキャップをさらに備え、
    　前記キャップは、前記ボイスコイルボビンの外周面から突出するように設けられるカバー部を備え、
    　前記カバー部は、前記ボイスコイルボビンの軸線方向において前記回避部との間に隙間を有するように設けられる、請求項１に記載のスピーカユニット。     A cap is provided to cover the voice coil bobbin on one axial side of the voice coil bobbin,
    The cap includes a cover portion provided so as to protrude from an outer circumferential surface of the voice coil bobbin,
    The speaker unit according to claim 1 , wherein the cover portion is provided so as to have a gap between the cover portion and the avoidance portion in the axial direction of the voice coil bobbin.
  7. 　前記振動板の内縁部は、前記回避部が形成された部分において前記ボイスコイルボビンの軸線方向一側に凸の形状となっている、請求項１に記載のスピーカユニット。 The speaker unit of claim 1, wherein the inner edge of the diaphragm is convex toward one side in the axial direction of the voice coil bobbin in the portion where the avoidance portion is formed.
  8. 　前記ボイスコイルボビンを支持するダンパをさらに備え、
    　前記振動板の外縁側には、前記ボイスコイルボビンの軸線方向において前記ダンパ側に向かって屈曲している屈曲部が形成されている、請求項１に記載のスピーカユニット。     A damper supporting the voice coil bobbin is further provided.
    2. The speaker unit according to claim 1, wherein a bent portion is formed on an outer edge side of the diaphragm, the bent portion being bent toward the damper in the axial direction of the voice coil bobbin.
  9. 　前記キャップは、前記ボイスコイルボビンの筒内に挿入されるように軸方向他側に凹んだ凹部を備えている、請求項６に記載のスピーカユニット。

          7. The speaker unit according to claim 6, wherein the cap has a recess recessed on the other axial side so as to be inserted into the cylindrical interior of the voice coil bobbin.
PCT/JP2023/031430 2022-10-11 2023-08-30 Speaker unit WO2024080017A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-163495 2022-10-11
JP2022163495A JP2024056532A (en) 2022-10-11 2022-10-11 Speaker unit

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WO2024080017A1 true WO2024080017A1 (en) 2024-04-18

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PCT/JP2023/031430 WO2024080017A1 (en) 2022-10-11 2023-08-30 Speaker unit

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6333296U (en) * 1985-09-05 1988-03-03
JPS6349895U (en) * 1986-09-19 1988-04-04
JPS6442696U (en) * 1987-09-08 1989-03-14
JPH09135495A (en) * 1995-11-09 1997-05-20 Fujitsu Ten Ltd Speaker structure and speaker assembly jig
JP2005012298A (en) * 2003-06-17 2005-01-13 Kenwood Corp Speaker
JP2005269337A (en) * 2004-03-19 2005-09-29 Pioneer Electronic Corp Loudspeaker apparatus
JP2005341211A (en) * 2004-05-27 2005-12-08 Kenwood Corp Speaker, manufacturing method thereof and damper for speaker
US20060133640A1 (en) * 2004-12-21 2006-06-22 Jl Audio, Inc. Loudspeaker lead wire management system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6333296U (en) * 1985-09-05 1988-03-03
JPS6349895U (en) * 1986-09-19 1988-04-04
JPS6442696U (en) * 1987-09-08 1989-03-14
JPH09135495A (en) * 1995-11-09 1997-05-20 Fujitsu Ten Ltd Speaker structure and speaker assembly jig
JP2005012298A (en) * 2003-06-17 2005-01-13 Kenwood Corp Speaker
JP2005269337A (en) * 2004-03-19 2005-09-29 Pioneer Electronic Corp Loudspeaker apparatus
JP2005341211A (en) * 2004-05-27 2005-12-08 Kenwood Corp Speaker, manufacturing method thereof and damper for speaker
US20060133640A1 (en) * 2004-12-21 2006-06-22 Jl Audio, Inc. Loudspeaker lead wire management system

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