JP2019208106A - Speaker and method of assembling the same - Google Patents

Abstract

To provide a speaker capable of coaxially providing a vibration system unit and a magnetic circuit unit by positioning a voice coil at a correct axial position even when a diaphragm and a dust cap are integrally formed, and a method of assembling the same.SOLUTION: The speaker includes: a magnetic circuit unit 2 having a screw portion 23a disposed coaxially with a magnetic gap 24; a voice coil bobbin 15 around which a voice coil 16 disposed in the magnetic gap 24 is wound; a diaphragm 12 in which the voice coil bobbin 15 is provided in a center hole; a dust cap 13 joined to the center hole of the diaphragm 12; a vibration system unit 1, arranged coaxially with the voice coil bobbin 15, having a screw portion 11a to be fastened with the screw portion 23a; and a voice coil positioning jig 4 for positioning the voice coil 16 in an axial direction in the magnetic gap 24 by being fitted in the voice coil bobbin 15 and being faced to the magnetic circuit unit 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a speaker provided with a vibration system unit and a magnetic circuit unit coaxially, and a method for assembling the speaker.

  Generally, a speaker includes a vibration system unit that radiates vibration as a sound wave, and a magnetic circuit unit that applies a magnetic force to the vibration system unit. At this time, the voice coil provided in the vibration system unit is disposed at a predetermined position in the magnetic gap formed in the magnetic circuit unit. This voice coil generates vibration by the interaction between the applied current and the magnetic force applied from the magnetic circuit unit. Such a conventional speaker is disclosed in Patent Document 1, for example.

Japanese Patent Laid-Open No. 2006-1000087

  Here, the axial positioning of the voice coil may be performed using a jig. Thus, when the voice coil is positioned using the positioning jig, the positioning jig is removed through the center hole of the diaphragm after the assembly of the speaker is completed.

  However, the central hole of the diaphragm is closed by a dust cap to protect the voice coil, and some conventional speakers are provided with the diaphragm and dust cap formed integrally. Yes. Therefore, when assembling a speaker employing such a configuration, the removal of the positioning jig affects the coaxiality between the vibration system unit and the magnetic circuit unit, so that the performance of the speaker may be reduced. is there.

  The present invention has been made to solve the above-described problems. Even when the diaphragm and the dust cap are integrally formed, the voice coil is positioned at the correct axial position, and the vibration system It is an object of the present invention to provide a speaker and a method for assembling the speaker, in which the unit and the magnetic circuit unit can be provided coaxially.

  The speaker according to the present invention includes a magnetic circuit unit having a magnetic side screw portion disposed coaxially with a magnetic gap of a magnetic circuit, a voice coil bobbin around which a voice coil disposed in the magnetic gap is wound, and a voice coil bobbin being a central hole A vibration system unit having a vibration plate provided therein, a dust cap joined to the vibration plate so as to close the center hole, and a vibration-side screw portion that is arranged coaxially with the voice coil bobbin and fastened to the magnetic-side screw portion; A positioning jig for positioning the voice coil in the axial direction in the magnetic gap by being fitted so as to be insertable / removable in the axial direction in the voice coil bobbin and abutting against the magnetic circuit unit inserted from the axial direction It is characterized by providing.

  A speaker assembly method according to the present invention includes a magnetic circuit unit having a magnetic gap of a magnetic circuit, a voice coil bobbin around which a voice coil disposed in the magnetic gap is wound, and a diaphragm in which the voice coil bobbin is provided in a central hole, In a speaker assembling method comprising a vibration system unit having a dust cap joined to a diaphragm so as to close a center hole, a magnetic circuit unit and a positioning jig fitted in a voice coil bobbin are arranged in an axial direction. The voice coil is axially positioned in the magnetic gap, and the fastening of the magnetic side screw part arranged coaxially with the magnetic gap and the vibration side screw part arranged coaxially with the voice coil bobbin is released. The magnetic circuit unit and positioning jig are protruded in the axial direction, and the positioning jig is voiced. Pull from the Irubobin, holds the axial position of the voice coil, is characterized in that fastening the the vibration-side threaded portion magnetic side thread portion.

  According to this invention, even when the diaphragm and the dust cap are integrally formed, the voice coil can be positioned at the correct axial position, and the vibration system unit and the magnetic circuit unit can be provided coaxially. .

It is the longitudinal cross-sectional view which showed the structure of the speaker which concerns on Embodiment 1 of this invention. It is the longitudinal cross-sectional view which showed the operation | movement when removing the jig | tool for voice coil positioning from the speaker which concerns on Embodiment 1 of this invention. It is the longitudinal cross-sectional view which showed the final structure of the speaker which concerns on Embodiment 1 of this invention. It is the longitudinal cross-sectional view which showed the structure of the speaker which concerns on Embodiment 2 of this invention. It is the longitudinal cross-sectional view which showed the operation | movement when removing the jig | tool for voice coil positioning from the speaker which concerns on Embodiment 2 of this invention. It is the longitudinal cross-sectional view which showed the final structure of the speaker which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing the configuration of the speaker according to Embodiment 1. FIG. FIG. 2 is a longitudinal sectional view showing an operation when the voice coil positioning jig is removed from the speaker according to the first embodiment. FIG. 3 is a longitudinal sectional view showing a final configuration of the speaker according to the first embodiment.

  The speaker shown in FIG. 1 is, for example, a cone type speaker that reproduces an audio signal, and includes a vibration system unit 1, a magnetic circuit unit 2, and a voice coil positioning jig 4. This speaker uses a voice coil positioning jig 4 when the vibration system unit 1 and the magnetic circuit unit 2 are assembled coaxially.

  As shown in FIG. 1, the vibration system unit 1 includes a frame 11, a diaphragm 12, a dust cap 13, an edge 14, a voice coil bobbin 15, a voice coil 16, a terminal 17, a lead wire 18, a damper 19, and a voice coil positioning. A jig 4 is provided.

  The frame 11 has a cylindrical shape in which the inner diameter of the distal end portion is larger than the inner diameter of the proximal end portion, and is disposed on the outermost radial direction in the vibration system unit 1. In addition, the front-end | tip part of the frame 11 is located in the front surface of a speaker. The diaphragm 12, the dust cap 13, and the edge 14 are accommodated coaxially with the frame 11 on the radially inner side of the frame 11.

  The diaphragm 12 has a cone shape, and radiates the vibration as a sound wave toward the front of the speaker by receiving vibration transmitted from a voice coil bobbin 15 described later. The diaphragm 12 has an annular shape in which the front surface is gradually positioned forward from the center hole toward the outer periphery.

  The dust cap 13 is joined to the diaphragm 12 so as to close the center hole of the diaphragm 12 from the front side of the speaker. That is, the diaphragm 12 and the dust cap 13 are integrally formed. The dust cap 13 has a convex vertical cross section in which the front end surface gradually protrudes toward the axis of the vibration system unit 1 and has a dome shape as a whole.

  The edge 14 has an annular shape and is disposed on the outer side in the radial direction of the diaphragm 12. The edge 14 is a member for connecting the frame 11 and the diaphragm 12. That is, the outer peripheral part of the diaphragm 12 and the inner peripheral part of the edge 14 are joined. Further, the tip of the frame 11 and the outer periphery of the edge 14 are joined.

  Each of the voice coil bobbin 15 and the voice coil positioning jig 4 has a cylindrical shape and is disposed to face the rear surface of the dust cap 13. Further, the voice coil bobbin 15 and the voice coil positioning jig 4 are arranged coaxially with the diaphragm 12 and the dust cap 13. Among these, the voice coil bobbin 15 is joined in the center hole of the diaphragm 12. The voice coil positioning jig 4 is fitted in the voice coil bobbin 15 so as to be insertable / removable in the axial direction.

  The voice coil 16 is a vibration source of the diaphragm 12. Specifically, the voice coil 16 is wound around the outer peripheral surface of the voice coil bobbin 15, and is integrated with the voice coil bobbin 15 by the interaction between the supplied audio signal and the magnetic flux in the magnetic circuit unit 2. Vibrates in the axial direction. Thereby, the vibration generated in the voice coil 16 is transmitted to the diaphragm 12 via the voice coil bobbin 15.

  The voice coil 16 is covered and protected from the front side of the speaker by the dust cap 13 by being wound around the voice coil 16 arranged coaxially with the diaphragm 12 and the dust cap 13.

  The terminal 17 is provided on the frame 11 and is supplied with an audio signal. The lead wire 18 electrically connects the voice coil bobbin 15 or the voice coil 16 and the terminal 17. FIG. 1 shows a configuration in which the voice coil bobbin 15 and the terminal 17 are electrically connected by a lead wire 18. As a result, the terminal 17 can send the supplied audio signal to the voice coil 16 via the lead wire 18 and the voice coil bobbin 15.

  The damper 19 has an annular shape and is joined between the inner peripheral surface of the frame 11 and the outer peripheral surface of the voice coil bobbin 15. The damper 19 attenuates lateral vibration generated in the voice coil bobbin 15 and the voice coil 16. Specifically, the damper 19 is formed by forming a flexible material so as to have a concentric waveform.

  On the other hand, as shown in FIG. 1, the magnetic circuit unit 2 is an outer magnet type unit that gives magnetism to the vibration system unit 1 from the outside in the radial direction, and includes a pole piece 21, a magnet 22, a plate 23, and The magnetic gap 24 is provided. The pole piece 21, the magnet 22, and the plate 23 constitute a magnetic circuit and are arranged coaxially. The magnetic gap 24 is a gap portion of the magnetic circuit.

  The pole piece 21 has a function of increasing the magnetic flux density in the magnetic gap 24, and includes a pole portion 21a and a flange portion 21b. Note that the direction of the magnetic flux in the magnetic gap 24 is a direction orthogonal to the vibration direction of the voice coil 16. The pole portion 21a has an axial shape. The pole portion 21a is disposed coaxially with the voice coil positioning jig 4 and is fitted in the voice coil positioning jig 4 so as to be insertable / removable in the axial direction. The flange portion 21b is disposed at the proximal end portion of the pole portion 21a.

  The magnet 22 and the plate 23 have an annular shape, and are disposed on the outer side in the radial direction of the pole portion 21 a and the voice coil positioning jig 4. The magnet 22 generates magnetic force. The plate 23 transmits the magnetic force generated by the magnet 22 toward the pole portion 21a.

  The flange portion 21b, the magnet 22, and the plate 23 are stacked in the axial direction, and the magnet 22 and the plate 23 are fixed to the flange portion 21b. That is, the magnet 22 is provided so as to be sandwiched from both sides in the axial direction by the flange portion 21 b and the plate 23.

  Thereby, the pole piece 21, the magnet 22, and the plate 23 constitute a magnetic circuit. This magnetic circuit has an annular magnetic gap 24. The magnetic gap 24 is a radial gap between the outer peripheral surface of the pole portion 21 a and the inner peripheral surface of the plate 23. On the other hand, the voice coil 16 wound around the voice coil bobbin 15 is disposed at an appropriate position in the magnetic gap 24, and the axial position of the voice coil 16 is determined by the voice coil positioning jig 4. It is positioned.

  Therefore, when the audio signal is fed through the terminal 17 and the lead wire 18, the voice coil 16 vibrates in the axial direction due to the interaction between the fed audio signal and the magnetic flux in the magnetic circuit unit 2. . Thereby, the vibration generated in the voice coil 16 is transmitted to the diaphragm 12 via the voice coil bobbin 15. As a result, the speaker radiates the vibration of the diaphragm 12 as a sound wave.

  Here, as described above, the axial positioning of the voice coil 16 with respect to the magnetic gap 24 is performed by the voice coil positioning jig 4. The voice coil positioning jig 4 has an inner peripheral butting surface 41 and an open end surface 42.

  The inner peripheral butting surface 41 is formed on the inner peripheral surface of the voice coil positioning jig 4. The inner peripheral abutting surface 41 is a surface that is abutted with the top surface of the pole portion 21a in the axial direction when the pole portion 21a of the pole piece 21 is inserted into the voice coil positioning jig 4 from the axial direction. It has become.

  The opening end surface 42 is an opening end surface located on the opposite side of the opening end surface facing the dust cap 13 in the voice coil positioning jig 4. The opening end surface 42 is a surface that abuts the surface of the flange portion 21b in the axial direction when the pole portion 21a of the pole piece 21 is inserted into the voice coil positioning jig 4 from the axial direction. .

  Thereby, when the pole part 21a of the magnetic circuit unit 2 is inserted, the voice coil positioning jig 4 abuts the inner peripheral abutting face 41 and the pole part 21a, and the opening end face 42 and the flange part 21b. , The voice coil 16 can always be positioned at the same axial position in the magnetic gap 24.

  Further, the frame 11 has a screw portion 11a that becomes a vibration side screw portion. The threaded portion 11 a is formed on the outer peripheral surface at the base end portion of the frame 11. Corresponding to this, the plate 23 has a screw portion 23a which becomes a magnetic side screw portion. The screw portion 23 a is formed on the inner peripheral surface of the plate 23, and is arranged coaxially with the magnetic gap 24 and the pole portion 21 a and the plate 23 that form the magnetic gap 24. Furthermore, the screw part 11a and the screw part 23a are coaxially arranged and can be fastened. That is, when the voice coil positioning jig 4, the pole portion 21a, and the flange portion 21b are brought into contact with each other, the vibration system unit 1 and the magnetic circuit unit 2 are coaxially connected with each other by the screw portion 11a and the screw portion 23a. Assembled into.

  In the speaker shown in FIG. 1, the voice coil positioning jig 4 is attached between the center portion of the vibration system unit 1 and the center portion of the magnetic circuit unit 2. For this reason, the operator needs to remove the voice coil positioning jig 4 from the inside of the speaker after assembling the vibration system unit 1 and the magnetic circuit unit 2.

  Therefore, a method for removing the voice coil positioning jig 4 after assembling the speaker will be described with reference to FIGS.

  First, as indicated by a solid line in FIG. 2, the operator releases the fastening between the screw portion 11 a of the frame 11 and the screw portion 23 a of the plate 23, and pulls out the magnetic circuit unit 2 from the vibration system unit 1. Accordingly, the pole portion 21a of the pole piece 21 is pulled out from the voice coil positioning jig 4, and the voice coil positioning jig 4 and the pole piece 21 are pushed out from a state where they are abutted in the axial direction. It is.

  Next, as indicated by a two-dot chain line in FIG. 2, the operator pulls out the voice coil positioning jig 4 from the voice coil bobbin 15 of the vibration system unit 1. At this time, even if the voice coil positioning jig 4 is pulled out, the voice coil bobbin 15 is supported by the frame 11 via the diaphragm 12 and the damper 19, so that no axial displacement occurs. That is, the voice coil 16 wound around the voice coil bobbin 15 does not shift its axial position, and continues to hold the axial position positioned by the voice coil positioning jig 4.

  Then, as shown in FIG. 3, the operator assembles the vibration system unit 1 from which the voice coil positioning jig 4 has been removed and the magnetic circuit unit 2 by fastening between the screw portions 11a and 23a. Thereby, the speaker is in a state in which the vibration system unit 1 and the magnetic circuit unit 2 are provided coaxially, and the assembly is finally completed.

  As described above, the speaker and the speaker assembly method according to the first embodiment, even when the diaphragm 12 and the dust cap 13 are integrally formed, position the voice coil 16 at the correct axial position and vibrate. The system unit 1 and the magnetic circuit unit 2 can be provided coaxially.

Embodiment 2. FIG.
FIG. 4 is a longitudinal sectional view showing a configuration of the speaker according to the second embodiment. FIG. 5 is a longitudinal sectional view showing an operation when the voice coil positioning jig is removed from the speaker according to the second embodiment. FIG. 6 is a longitudinal sectional view showing a final configuration of the speaker according to the second embodiment.

  The speaker according to the second embodiment employs an inner magnet type magnetic circuit unit 3 instead of the outer magnet type magnetic circuit unit 2 with respect to the speaker according to the first embodiment. For this reason, in the speaker according to the second embodiment, the description of the vibration system unit 1 and the voice coil positioning jig 4 which are common parts with the speaker according to the first embodiment is omitted.

  As shown in FIG. 4, the magnetic circuit unit 3 is an internal magnet type unit that gives magnetism to the vibration system unit 1 from the inside in the radial direction, and includes a pole piece 31, a magnet 32, a plate 33, and a magnetic unit. A gap 34 is provided. The pole piece 31, the magnet 32, and the plate 33 constitute a magnetic circuit and are arranged coaxially. The magnetic gap 34 is a gap portion of the magnetic circuit.

  The pole piece 31 has a function of increasing the magnetic flux density in the magnetic gap 34, and has a pole portion 31a and a bottom plate portion 31b. Note that the direction of the magnetic flux in the magnetic gap 34 is a direction orthogonal to the vibration direction of the voice coil 16. The pole portion 31 a has a cylindrical shape and is arranged coaxially with the voice coil positioning jig 4. The bottom plate portion 31b has a circular shape and is formed so as to close the proximal end side opening end of the pole portion 31a. That is, the pole portion 31a is formed on the outer peripheral portion of the bottom plate portion 31b.

  The magnet 32 and the plate 33 have an axial shape and are arranged on the inner side in the radial direction of the pole portion 31 a and the voice coil positioning jig 4. Further, the magnet 32 and the plate 33 are arranged coaxially with the voice coil positioning jig 4 and are fitted in the voice coil positioning jig 4 so as to be insertable / removable in the axial direction. The magnet 32 generates a magnetic force. The plate 33 transmits the magnetic force generated by the magnet 32 toward the pole portion 31a.

  Further, the bottom plate portion 31b, the magnet 32, and the plate 33 are stacked in the axial direction, and the magnet 32 and the plate 33 are fixed to the bottom plate portion 31b. That is, the magnet 32 is provided so as to be sandwiched from both sides in the axial direction by the bottom plate portion 31 b and the plate 33.

  Thus, the pole piece 31, the magnet 32, and the plate 33 constitute a magnetic circuit. This magnetic circuit has an annular magnetic gap 34. The magnetic gap 34 is a radial gap between the inner peripheral surface of the pole portion 31 a and the outer peripheral surface of the plate 33. On the other hand, the voice coil 16 wound around the voice coil bobbin 15 is disposed at an appropriate position in the magnetic gap 34, and the axial position of the voice coil 16 is determined by the voice coil positioning jig 4. It is positioned.

  Therefore, when the audio signal is fed via the terminal 17 and the lead wire 18, the voice coil 16 vibrates in the axial direction due to the interaction between the fed audio signal and the magnetic flux in the magnetic circuit unit 3. . Thereby, the vibration generated in the voice coil 16 is transmitted to the diaphragm 12 via the voice coil bobbin 15. As a result, the speaker radiates the vibration of the diaphragm 12 as a sound wave.

  Here, as described above, the axial positioning of the voice coil 16 with respect to the magnetic gap 34 is performed by the voice coil positioning jig 4. That is, the inner peripheral butting surface 41 of the voice coil positioning jig 4 is the same as the top surface of the plate 33 when the magnet 32 and the plate 33 are inserted into the voice coil positioning jig 4 from the axial direction. The surface is abutted in the axial direction.

  As a result, the voice coil positioning jig 4 causes the inner circumferential butting surface 41 and the plate 33 to abut each other in the magnetic gap 34 when the magnet 32 and the plate 33 of the magnetic circuit unit 3 are inserted. The voice coil 16 can always be positioned at the same axial position.

  Further, the pole piece 31 has a threaded portion 31c serving as a magnetic side threaded portion. The threaded portion 31c is formed on the inner peripheral surface of the pole portion 31a, and is arranged coaxially with the magnetic gap 34 and the pole portion 31a and the plate 33 forming the magnetic gap 34. Furthermore, the screw portion 11a and the screw portion 31c are arranged coaxially and can be fastened. That is, when the voice coil positioning jig 4 and the plate 33 are brought into contact with each other, the vibration system unit 1 and the magnetic circuit unit 3 are assembled coaxially by fastening the screw portion 11a and the screw portion 31c.

  In the speaker shown in FIG. 4, the voice coil positioning jig 4 is attached between the center portion of the vibration system unit 1 and the center portion of the magnetic circuit unit 3. For this reason, the operator needs to remove the voice coil positioning jig 4 from the inside of the speaker after assembling the vibration system unit 1 and the magnetic circuit unit 3.

  Therefore, a method for removing the voice coil positioning jig 4 after assembling the speaker will be described with reference to FIGS.

  First, as indicated by a solid line in FIG. 5, the operator releases the fastening between the screw portion 11 a of the frame 11 and the screw portion 31 c of the pole piece 31 and pulls out the magnetic circuit unit 3 from the vibration system unit 1. As a result, the magnet 32 and the plate 33 are pulled out from the voice coil positioning jig 4, and the voice coil positioning jig 4 and the plate 33 are ejected from a state where they are abutted in the axial direction.

  Next, as indicated by a two-dot chain line in FIG. 5, the operator pulls out the voice coil positioning jig 4 from the voice coil bobbin 15 of the vibration system unit 1. At this time, even if the voice coil positioning jig 4 is pulled out, the voice coil bobbin 15 is supported by the frame 11 via the diaphragm 12 and the damper 19, so that no axial displacement occurs. That is, the voice coil 16 wound around the voice coil bobbin 15 does not shift its axial position, and continues to hold the axial position positioned by the voice coil positioning jig 4.

  Then, as shown in FIG. 6, the operator assembles the vibration system unit 1 from which the voice coil positioning jig 4 has been removed and the magnetic circuit unit 3 by fastening between the screw portions 11a and 31c. Thereby, the speaker is in a state in which the vibration system unit 1 and the magnetic circuit unit 3 are provided coaxially, and the assembly is finally completed.

  As described above, the speaker and the speaker assembly method according to the second embodiment are arranged such that the voice coil 16 is positioned at the correct axial position to vibrate even when the diaphragm 12 and the dust cap 13 are integrally formed. The system unit 1 and the magnetic circuit unit 3 can be provided coaxially.

  In the present invention, within the scope of the invention, a free combination of each embodiment, a modification of any component in each embodiment, or omission of any component in each embodiment is possible. Is possible.

  DESCRIPTION OF SYMBOLS 1 Vibration system unit, 2, 3 Magnetic circuit unit, 4 Voice coil positioning jig, 11 Frame, 11a Thread part, 12 Diaphragm, 13 Dust cap, 14 Edge, 15 Voice coil bobbin, 16 Voice coil, 17 Terminal, 18 Lead wire, 19 damper, 21, 31 pole piece, 21a, 31a pole part, 21b flange part, 22, 32 magnet, 23, 33 plate, 23a, 31c screw part, 24, 34 magnetic gap, 31b bottom plate part, 41 inside Circumferential butting surface, 42 Open end surface.

Claims (6)

A magnetic circuit unit having a magnetic side screw portion disposed coaxially with a magnetic gap of the magnetic circuit;
A voice coil bobbin around which a voice coil disposed in the magnetic gap is wound, a diaphragm in which the voice coil bobbin is provided in a center hole, a dust cap joined to the diaphragm so as to close the center hole, A vibration system unit that is disposed coaxially with the voice coil bobbin and has a vibration side screw portion that is fastened to the magnetic side screw portion;
In the voice coil bobbin, it is fitted so as to be insertable / removable in the axial direction, and is positioned against the magnetic circuit unit inserted from the axial direction to position the voice coil in the magnetic gap in the axial direction. A speaker comprising a jig. The vibration system unit is
A frame that supports the diaphragm;
A damper joined between the diaphragm and the frame;
The speaker according to claim 1, wherein the vibration side screw portion is formed on the frame. The magnetic circuit unit is:
Having a pole piece and a plate forming the magnetic gap;
The speaker according to claim 1, wherein the magnetic side screw portion is formed on the pole piece or the plate. The magnetic circuit unit is:
A magnet that constitutes the magnetic circuit together with the pole piece and the plate;
The speaker according to claim 3, wherein the plate on which the magnetic side screw portion is formed and the magnet are arranged on the radially outer side of the pole piece. The magnetic circuit unit is:
A magnet that constitutes the magnetic circuit together with the pole piece and the plate;
The speaker according to claim 3, wherein the plate and the magnet are arranged on a radially inner side of the pole piece in which the magnetic side screw portion is formed. A magnetic circuit unit having a magnetic gap of the magnetic circuit;
A vibration having a voice coil bobbin around which a voice coil disposed in the magnetic gap is wound, a diaphragm in which the voice coil bobbin is provided in a center hole, and a dust cap joined to the diaphragm so as to close the center hole In a method for assembling a speaker comprising a system unit,
The magnetic circuit unit and a positioning jig that fits in the voice coil bobbin are abutted in the axial direction, and the voice coil is positioned in the magnetic gap in the axial direction,
The magnetic circuit unit and the positioning jig are connected to each other by releasing the fastening between the magnetic side screw part arranged coaxially with the magnetic gap and the vibration side screw part arranged coaxially with the voice coil bobbin. Thrust in the direction,
Pull out the positioning jig from the voice coil bobbin to maintain the axial position of the voice coil;
The method for assembling a speaker, wherein the magnetic side screw portion and the vibration side screw portion are fastened together.

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