KR101012862B1 - Sound converter - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm for an acoustic transducer, and more particularly, to an acoustic transducer that allows a leader line of an acoustic transducer to be drawn out without interference.

The acoustic conversion device according to the present invention includes a diaphragm assembly comprising a central portion, a diaphragm comprising a side dome formed around the central portion, a coil portion mounted around the bottom surface of the central portion, and a magnetic circuit for causing magnetic flux to cross at least a portion of the coil portion. A frame having a first accommodating portion accommodating a magnetic circuit at a lower side, a second accommodating portion accommodating a diaphragm assembly at an upper side thereof, and a lead-out groove for drawing out lead wires adjacent to the first accommodating portion to the outside; , The protector protects the diaphragm at the upper side of the frame, and a lead-out groove is formed at one end of the frame, and the lead-out line of the coil part is bent at least once at the lower side of the side dome to proceed to the lead-out groove.

Description

Sound converter {SOUND CONVERTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic conversion apparatus, and more particularly, to an acoustic conversion apparatus that allows a leader line of an acoustic conversion apparatus to be drawn out without interference.

In general, a speaker converts electrical energy into mechanical energy by a voice coil existing between pores by Fleming's left-hand law that a conductor in which current flows in a magnetic field receives a force. That is, when a current signal containing several frequencies is applied to the voice coil, the voice coil generates mechanical energy according to the strength of the current and the magnitude of the frequency, and generates vibration on the diaphragm attached to the voice coil, thereby ultimately recognizing the human ear. It can generate a sound pressure of a predetermined magnitude.

The magnetic circuits of these speakers are designed so that the magnetic flux can be bridged at right angles to the voice coils present in the air gap by using a magnet (permanent magnet) and a top plate (or upper plate) in the yoke made of ferrous metal, respectively. The work is bonded to the diaphragm to generate the up and down excitation force by the input signal to vibrate the diaphragm bound to the frame to generate sound pressure. The diaphragm has various shapes of waves in order to remove the buckling phenomenon and excellent response during the up and down oscillation, and the shape of the diaphragm acts as a design variable having the greatest influence on the frequency characteristics.

1 is a cross-sectional view of a microspeaker according to the prior art.

As shown in FIG. 1, the microspeaker transmits the magnetic flux to or from the frame 1, the yoke 2 inserted and mounted inside the frame 1, and the yoke 2. The inner ring top plate 5 for receiving the magnetic flux from the inner ring magnet 3 and the outer ring magnet 4 and the inner ring magnet 3 or the outer ring magnet 4 so that the magnetic flux is transmitted at right angles to the voice coil 7 and A voice coil 7 and a voice coil in which a portion is inserted into the space between the outer ring top plate 6, the inner ring magnet 3 and the inner ring top plate 5, and the outer ring magnet 4 and the outer ring top plate 6 7) is attached to the diaphragm 8 to generate a vibration according to the vertical movement of the voice coil 7, the ventilation hole 9 provided in the frame 1 of the lower side of the diaphragm 8, and the sound emitting hole 11 ) Is formed, but the protector 10 to protect the diaphragm 8, and the leader line (not shown) of the voice coil 7 is the side of the frame (1) Through the grooves (not shown) formed in the through or to the frame (1) is drawn out are respectively soldered to the connection terminals 12 along the outer side of the frame (1). The connection terminal 12 allows a pair of lead wires (not shown) and lead wires (input lines and output lines) to be connected to each other from the outside.

The diaphragm 8 consists of a dome-shaped center dome 8a at the center, and a side dome 8b formed around the center dome 8a.

In the conventional microspeaker, in order to avoid the interference with the yoke or the like in the lead line drawn out from the voice coil, a method of bonding to the bottom of the diaphragm is used. The process of joining the lead coil and the diaphragm of the voice coil is performed by the bonding process in which the lead wire is fixed by bonding the lead to the bottom of the diaphragm, and is made by hand even though high precision is required, and the process time is long. The cost increases. In addition, the defect is frequently caused by the most vulnerable part of the microspeaker manufacturing process.

In addition, since the lead wire is fixed to the vibration plate by the bond, when the electrical signal is converted into the acoustic signal through the vibration, the vibration of the diaphragm due to the unbalanced mass and the strong component of the gun, so that the vibration characteristics deteriorate acoustic characteristics There is this.

An object of the present invention is to provide an acoustic conversion apparatus that allows the lead line of the coil unit to be drawn out without interference with other elements.

In addition, an object of the present invention is to provide a sound conversion device that extends the leader line to minimize the effect of the leader line of the coil portion on the diaphragm.

It is also an object of the present invention to provide an acoustic transducer which increases the reliability of the coupling between the yoke assembly and the frame.

The acoustic conversion device according to the present invention includes a diaphragm assembly comprising a central portion, a diaphragm comprising a side dome formed around the central portion, a coil portion mounted around the bottom surface of the central portion, and a magnetic circuit for causing magnetic flux to cross at least a portion of the coil portion. A frame having a first accommodating part for accommodating a magnetic circuit at a lower side, a second accommodating part for accommodating a diaphragm assembly at an upper side, and a lead-out groove for drawing out lead wires adjacent to the first accommodating part to the outside; , The protector protects the diaphragm at the upper side of the frame, and a lead-out groove is formed at one end of the frame, and the lead-out line of the coil part is bent at least once at the lower side of the side dome to proceed to the lead-out groove.

In addition, the sound converting apparatus preferably advances the lead wire of the coil part to the lead groove, but has a lead wire path for preventing contact with the magnetic circuit.

In addition, the magnetic circuit includes a yoke made up of a magnet, a top plate mounted on the magnet, a yoke made of a base on which the magnet is mounted, and a side plate mounted to form a space between the sides of the magnet around the base. The line path includes a first groove formed above the side plate of the yoke, and the leader line preferably passes through the inside of the first groove or travels above the first groove.

Further, the leader line path is preferably provided adjacent to the first accommodation portion of the frame, and has a second groove that guides the leader line to the leader groove.

In addition, the second groove is preferably formed in the partition wall separating the first accommodating portion and the second accommodating portion.

In addition, the drawing groove is preferably formed stepped with respect to the diaphragm seating portion formed in the frame.

In addition, the first groove and the second groove is preferably formed to face each other.

Further, it is preferable that the first groove is a pair of grooves separated from each other by the support plate, and the second groove has an inner groove for receiving the support plate.

In addition, the second groove is preferably provided with an inner projection that is inserted into the first groove.

The present invention allows the lead wire of the coil unit to be drawn out to the outside without interference with other devices, so that the lead wire is damaged or other devices are not damaged, so that the transmission of the electrical signal can be made safely.

In addition, the present invention has the effect of minimizing the influence on the sound pressure of the diaphragm by extending the lead-out line to minimize the effect of the lead line of the coil portion on the diaphragm.

In addition, the present invention has the effect of strengthening the coupling between the yoke assembly and the frame, thereby increasing the strength reliability of the acoustic transducer.

In the following, the invention is explained in detail based on the embodiments of the invention and the accompanying drawings.

2 is a cross-sectional view of the acoustic transducer according to the present invention, FIG. 3 is a perspective view of the yoke assembly of FIG. 2, and FIGS. 4A and 4B are a perspective view and a plan view of the frame of FIG. 2.

2 includes a frame 20, a yoke assembly fixedly mounted to the lower side of the frame 20 to form a space A, and configured to form a magnetic circuit, and at least partially inserted into the space A. The coil unit 50, the coil unit 50 is mounted on the lower end (or bottom), the diaphragm 60 and the sound emitting hole 72 is mounted on the frame 20, the diaphragm 60 is formed The protector 70 to protect and the ventilation hole 80 provided in the frame 20 of the lower side of the diaphragm 60, the lead wire (not shown) of the coil unit 50 is the side of the frame 20 It is provided with a connection terminal 90 penetrating or drawn out to the outside through a groove (not shown) formed in the frame 20, respectively connected along the outer side of the frame 20. The connection terminal 90 allows a pair of lead wires (not shown) and lead wires (input lines and output lines) to be connected to each other from the outside. Here, the coil unit 50 and the diaphragm 60 may be collectively referred to as a diaphragm assembly.

The diaphragm 60 has a laminated structure of the first vibrating plate 62 and the second vibrating plate 64 mounted on the upper surface of the first vibrating plate 62. The central portion of the first vibrating plate 62 has a planar shape, a side dome is formed around the central portion, and a seating portion 66 fixed to the frame 20 is formed at an edge of the side dome. The second vibration plate 64 is located in the center of the first vibration plate 62 in a planar shape.

The coil unit 50 is mounted on the rear surface of the diaphragm 60, and is mounted corresponding to the center portion of the first vibration plate 62 or the edge of the second vibration plate 64 or the mounting position of the second vibration plate 64.

The yoke assembly is spaced apart from the yoke 30 including the base 30a, the side plate 30b forming a wall at the edge of the base 30a, and the side plate 30b on the upper surface of the base 30a at predetermined intervals. The magnet 40 is mounted to form the separation space A, and the top plate 42 is mounted on the upper surface of the magnet 40. The magnetic flux passes through the space A between the top plate 42 and the site plate 30b, and at least a portion of the coil part 50 is positioned at right angles to the magnetic flux. The yoke 30, magnet 40 and top plate 42 of the yoke assembly may be oval type, circular, square or track type, as shown, depending on the shape of the diaphragm 60 and nose The shape of the portion 50 may be modified.

Magnet 40 is formed of a one-magnet type, the magnetic field efficiency is high. In particular, since the side dome of the diaphragm 60 is to occupy a smaller area than the central portion of the plane, since the magnet 40 may have a somewhat smaller area than the central portion occupying a large area, the magnet 40 of a larger area Can be mounted. Therefore, since maximizing the area (or volume) of the magnet 40 is the maximization of the magnetic circuit, the sound pressure of the acoustic transducer can be improved in the entire frequency band.

The yoke 30 has a fixing protrusion 32 for fixing to the frame 20 on the upper outer surface of the side plate (30b). The fixing protrusion 32 may be changed in its mounting position as necessary.

In addition, as shown in FIG. 3, the yoke 30 is placed in a space where the lead line proceeds so that interference between the lead line of the coil part 50 and the site plate 30b does not occur above the side plate 30b. The groove 34 is provided. Through the provision of the grooves 34, even when the coil unit 50 vibrates and the lead wire vibrates under the influence of the vibration when the acoustic transducer is driven, the lead wire and the yoke 30 (particularly, the side plate 30b). )) Can be prevented. The groove 34 is penetrated by the leader line or the leader line advances above the groove 34 to prevent the leader line from contacting the yoke 30.

As shown in FIGS. 4A and 4B, the frame 20 includes a first receptacle 22 for receiving and mounting a yoke assembly (especially yoke 30) and a diaphragm assembly (especially diaphragm 60). And a second accommodating portion 25 accommodating and mounting the protector 70, a lead-out groove 27 allowing the lead wire of the coil part 50 to travel to the outside, and a lead wire of the coil part 50. It is provided with a groove 28 to advance through the groove 34 to the withdrawal groove (27). However, since the frame 20 is an insulating material, even when the lead wire of the coil part 50 is in contact with the side and bottom of the lead groove 27 or the groove 28 in the lead groove 27 or the groove 28. do. The withdrawal groove 27 corresponds to a space formed stepped in the accommodation groove 29a, and is formed stepped with respect to the diaphragm seating part 26. The receiving grooves 29a are formed in pairs corresponding to the short axis direction, and the receiving grooves 29b are formed in pairs corresponding to the long axis direction.

The first accommodating part 22 and the second accommodating part 25 are divided by partition walls 23. The partition walls 23 accommodate the fixing protrusions 32 of the yoke 30 to accommodate the yoke 30. A plurality of fixing grooves 24 for fixing are formed. In addition, the partition 23 is provided with a ventilation hole 80 through which the first accommodating part 22 and the second accommodating part 25 pass. In addition, a groove 28 is formed in the partition 23, and the groove 28 is formed at a position corresponding to the groove 34 of the yoke 30 described above, and the leader line proceeds to the lead-out groove 27. It is desirable to.

Since the inner surface of the first accommodating portion 22 is in contact with the outer surface of the side plate 30b of the yoke 30, and the fixing protrusion 32 is inserted into and fixed to the fixing groove 24, the yoke assembly is a frame ( 20) is fixedly mounted.

The second accommodating portion 25 has a diaphragm seating portion 26 to allow the seating portion 66 of the diaphragm 60 to be fixedly mounted. After the mounting portion 66 of the diaphragm 60 is fixedly mounted on the diaphragm seating portion 26, the protector 70 is fixedly mounted thereon.

4C is a detailed plan view of the diaphragm.

When the first stiffness plate 62 having a small rigidity is attached to the diaphragm seating portion 26 of the frame 20 by using an adhesive bond, the first vibration plate 62 is likely to be assembled with the deformation and may be fixed. It is hard to catch. Accordingly, the diaphragm 60 includes guide protrusions 68a and 68b on the outside of the seating portion 66, and the guide protrusions 68a and 68b are provided in the receiving groove 29a of the frame 20, By being formed at the position corresponding to 29b, the diaphragm 60 is positioned in the correct position when the diaphragm 60 is assembled with the frame 20 by the guide protrusions 68a and 68b.

5A and 5B are views illustrating a manufacturing process of the diaphragm.

FIG. 5A illustrates a process of forming the first diaphragm 62. The first vibrating plate 62 includes a first sub diaphragm 62a including a thermoplastic polyurethane elastic material (TPU) material for minimizing the rigidity of the diaphragm. The second sub diaphragm 62b including at least one of a material such as polyetherimide (PEI), polyester (PET) or polyester ether ketone (PEEK), polyarylate material, etc. Molded into a laminated film. The TPU material is soft, so that it may stick to the mold during the molding process, so that the TPU material is always laminated sequentially on the upper surface of the second sub diaphragm 62b.

Through such molding, the first vibrating plate 62 is formed with a central portion C, a side dome S, and a seating portion 66. As shown in Figure 5a, instead of reducing the width of the side dome (S) instead of using a soft diaphragm material to improve the low-frequency vibration characteristics and the diaphragm of the central portion (C) having a wide plate-like structure, the diaphragm 60 The effective area is widened to improve sound pressure and to induce good sound quality.

5B illustrates a process of forming the second vibration plate 64. The elastic layer 64c is formed between the first and second metal plates 64a and 64b and the first and second metal plates 64a and 64b. Through the lamination, the stiffness of the center portion (C) of the first vibration plate 62 is compensated for to prevent sound distortion. Here, only one layer of the first metal plate 64a and the second metal plate 64b may be provided.

The first and second metal plates 64a and 64b are light and rigid metal layers such as aluminum, and the aluminum layers are easily deformed during fabrication, thereby compressing a styrofoam (PS) -based material having good restoring force. Use by laminating.

The structures and manufacturing processes of FIGS. 5A and 5B described above are applicable not only to the Oval type acoustic transducer but also to the circular type acoustic transducer.

6A and 6B are partial enlarged views of the coil unit, and FIG. 7 is a bottom perspective view showing the positional relationship between the diaphragm and the coil unit.

As shown in FIGS. 6A and 6B, the coil unit 50 includes a winding unit 51 in which a coil is wound, and a pair of lead wires 52 and 54 connected to the winding unit 51.

As described above, due to the maximization of the effective areas of the magnetic circuit and the diaphragm, the inner diameter of the winding part 51 can be increased. Due to the increase in the inner diameter of the winding part 51, since the winding length per turn during winding is increased, a relatively thick coil is used to maintain the same resistance and the same height, and accordingly, the length of the coil to be subjected to the force is longer, thereby increasing the electromagnetic force. To increase. This contributes linearly to the low frequency increase, and the midrange does not increase the sound pressure significantly because the weight increases as compared to the increase in electromagnetic force. Due to the increase in the inner diameter of the coil, the width of the side dome (S) is narrowed, such as the first vibration plate 62, and the low rigid film is used to minimize the stiffness of the speaker to improve the acoustic characteristics of the low frequency band.

As shown, the leader lines 52 and 54 are respectively drawn out from the upper side of the winding part 51, that is, the lead points of the leader lines 52 and 54 are the upper side of the winding part 51. . The leader lines 52 and 54 have inflections 53 and 55 located below the side dome S. As shown in FIG.

The lead lines 52 and 54 proceed to be substantially parallel to or slightly lower to the lead point, but the inflections 53 and 55 included in this process are located below the side dome S, so that the side dome The contact with the lower side of S is also prevented, and the contact with the side of the side dome S is prevented while being drawn out.

Further, through the inflections 53 and 55, the leader lines 52 and 54 travel downward from the upper side (outside of the side dome S or seating portion 66) near the lead groove 27. And finally, it proceeds through the withdrawal groove 27 formed corresponding to the frame 20, and the terminal is connected to the external connection terminal 90. FIG.

The leader lines 52 and 54 travel through the space defined by the groove 34 when traveling on the yoke 30 or through the groove 34, and the grooves of the frame 20 ( Proceeds adjacent to or in contact with the space or groove 28 formed by the 28 or the side of the groove 28, corresponding to the inner surface of the second receiving portion 25 of the frame 20, and withdrawal groove It extends outward through (27).

As shown in FIG. 7, the upper side surface of the winding part 51 of FIG. 6A is mounted at the center portion C of the diaphragm 60, and the lead lines 52 and 54 drawn out on the winding part 51 are provided. ), The inflections 53 and 55 are located under the region corresponding to the side dome S. Here, the leader lines 52 and 54 have a structure that proceeds without any contact with the diaphragm 60, that is, without coupling.

8 is a perspective view of another embodiment of the yoke assembly of FIG. 2, and FIGS. 9A and 9B are a perspective view and a plan view of another embodiment of the frame of FIG. 2. 8 to 9B illustrate circular acoustic transducers in addition to the oval acoustic transducers described above. The cross-sectional view of the acoustic conversion device of the Oval type in FIG. 2 is almost the same as the cross-sectional view of the circular sound conversion device.

10A and 10B are partially enlarged views of another embodiment of the coil unit, and FIG. 11 is a bottom perspective view showing the positional relationship between the diaphragm and the coil unit.

The yoke assembly of FIG. 8 includes a base 130a and a side plate 130b corresponding to the yoke 30 including the base 30a and the side plate 30b of FIG. 3, and the base 130a. A magnet 140 is mounted on the top surface to be spaced apart from the side plate 130b at a predetermined interval to form a space B, and a top plate 142 is mounted on the magnet 140.

The magnet 140 corresponds to the magnet 40 of FIG. 3, and performs the same function.

The yoke 130 has a fixing protrusion 132 corresponding to the fixing protrusion 32 of the yoke 30. According to the shape of the yoke 130, the fixing protrusion 132 may have a circular rim shape as shown in FIG. 8, may have a different shape, or may be formed at another position.

In addition, the yoke 130 includes a groove 134 corresponding to the groove 34 of FIG. 3, and when the acoustic converter is driven, the coil unit 150 vibrates and the leader line vibrates under the influence of the vibration. Even if it is, contact between the leader line and the yoke 130 (particularly, the side plate 130b) can be prevented. The groove 134 penetrates through the leader line, or the leader line proceeds to the upper side of the groove 134 to prevent the leader line from contacting the yoke 130.

In addition, the yoke 130 includes a support plate 132a between the pair of grooves 134, and the support plate 132a is inserted into the groove 129c to be mounted to the yoke 130 and the frame 120. It performs a function of coupling the liver, separating the pair of grooves 134, and limits the width of the grooves 134.

As shown in FIGS. 9A and 9B, the frame 120 includes a first accommodating part 122 corresponding to the first accommodating part 22 and a second accommodating part 125 corresponding to the second accommodating part 25. ), A withdrawal groove 127 corresponding to the withdrawal groove 27, and a groove 128 corresponding to the groove 28.

The first accommodating part 122 and the second accommodating part 125 are divided by the partition wall 123. The partition wall 123 accommodates the yoke 130 by receiving the fixing protrusion 132 of the yoke 130. A plurality of fixing grooves 124 for fixing are formed. In addition, the partition wall 123 is provided with a ventilation hole 180 through which the first accommodating part 122 and the second accommodating part 125 pass. In addition, a groove 128 is formed in the partition wall 123, and the groove 128 is formed at a position corresponding to the groove 134 of the yoke 130 described above, and the leader line proceeds to the lead groove 127. It is desirable to. The lead-out groove 127 includes an induction groove 129 formed to be stepped with respect to the diaphragm seating part 126, and the lead-out line is guided to the lead-out groove 127 through the groove 128 and the guide groove 129. do. This corresponds to the leader line path. The lead-out groove 127 is integrally formed with the guide groove 129 and is stepped with respect to the diaphragm seating part 126.

In addition, the groove 128 includes inner protrusions 128a and 128b inserted into the pair of grooves 134 of the yoke 130, and the yoke 130 is disposed between the inner protrusions 128a and 128b. The inner side groove 128c into which the support plate 132a of () is inserted and fixed is provided. Since the inner protrusions 128a and 128b are inserted above the groove 134, the leader line can be prevented from contacting the yoke 130. In addition, the inner groove 128c may strengthen the coupling between the yoke 130 and the frame 120.

Since the inner surface of the first accommodating part 122 is in contact with the outer surface of the side plate 130b of the yoke 130, and the fixing protrusion 132 is inserted into and fixed to the fixing groove 124, the yoke assembly is framed ( 120 is fixedly mounted.

The second accommodating part 125 includes a diaphragm seating part 126 that allows the seating part 166 of the diaphragm 160 to be fixedly mounted. After the mounting portion 166 of the diaphragm 160 is fixedly mounted to the diaphragm seating portion 126, the protector 170 is fixedly mounted thereon.

As shown in FIGS. 10A and 10B, the coil unit 150 includes a winding unit 151 wound with a coil, and a pair of leader lines 152 and 154 connected to the winding unit 151. Corresponding to the winding portion 51 and the lead lines 52 and 54.

As shown, the leader lines 152 and 154 are drawn out from the upper side of the winding unit 151, that is, the lead points of the leader lines 152 and 154 are the upper side of the winding unit 151. . The leader lines 152 and 154 have inflections 153 and 155 located under the side dome S. As shown in FIG.

The leader lines 152 and 154 proceed to be substantially parallel to or slightly lower than the lead point, but the inflections 153 and 155 included during this process are located under the side dome S, The contact with the lower side of S is also prevented, and the contact with the side of the side dome S is prevented while being drawn out.

Further, through the inflections 153 and 155, the leader lines 152 and 154 travel downward from the upper side (outside or seating part 166 of the side dome S) near the drawing groove 127. Then, finally, it proceeds through the withdrawal groove 127 formed corresponding to the frame 120, and the terminal is connected to the external connection terminal 190.

The leader lines 152 and 154 travel through the space formed by the groove 134 or travel through the groove 134 when traveling on the yoke 130, and the grooves of the frame 20 ( Proceeds adjacent to or in contact with the space formed by the 128 or above the groove 128 or the side of the groove 128, and proceeds corresponding to the inner surface of the second receiving portion 125 of the frame 120, withdrawal groove It extends outward through 127.

As shown in FIG. 11, the upper side surface of the winding unit 151 of FIG. 10A is mounted at the central portion C of the diaphragm 160, and leads 152 and 154 drawn out to the winding unit 151. ), The inflections 153 and 155 are located under the region corresponding to the side dome S. Here, the leader line 152, 154 has a structure that proceeds without any contact, that is, without coupling to the diaphragm 60.

In the above, the present invention has been described in detail based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

1 is a cross-sectional view of a microspeaker according to the prior art.

2 is a cross-sectional view of an acoustic transducer according to the present invention.

3 is a perspective view of the yoke assembly of FIG. 2.

4A and 4B are perspective and plan views of the frame of FIG. 2.

4C is a detailed plan view of the diaphragm.

5A and 5B are views illustrating a manufacturing process of the diaphragm.

6A and 6B are partial enlarged views of the coil unit.

7 is a bottom perspective view showing the positional relationship between the diaphragm and the coil unit.

8 is a perspective view of another embodiment of the yoke assembly of FIG. 2.

9A and 9B are perspective and plan views of another embodiment of the frame of FIG. 2.

10A and 10B are partially enlarged views of another embodiment of the coil unit.

11 is a bottom perspective view showing a positional relationship of another embodiment of the diaphragm and the coil unit.

Claims (9)

A diaphragm assembly comprising a central portion, a diaphragm comprising a side dome formed around the central portion, and a coil portion mounted around a bottom surface of the central portion; A magnetic circuit for causing magnetic flux to be bridged at right angles to at least a portion of the coil portion; A first accommodating portion accommodating the magnetic circuit at a lower side, a second accommodating portion accommodating the diaphragm assembly at an upper side thereof, and a lead-out groove for drawing out a part of the lead wire portion adjacent to the first accommodating portion; A frame having; A protector protecting the diaphragm on the upper side of the frame; The lead line of the coil portion is advanced to the lead-out groove, it is made of a lead line path to prevent contact with the magnetic circuit, The magnetic circuit includes a yoke consisting of a magnet, a top plate mounted above the magnet, a base on which the magnet is mounted, and a side plate mounted to form a space between the sides of the magnet around the base. The leader line path includes a first groove formed above the side plate of the yoke, and the leader line passes through the inside of the first groove or travels above the first groove. . The method of claim 1, The lead wire of the coil unit is bent at least one or more times below the side dome to advance to the lead groove. delete The method of claim 1, And the leader line path is formed adjacent to the first accommodating part of the frame, and has a second groove for guiding the leader line to the leader groove. The method of claim 4, wherein The second groove is formed in the partition wall separating the first accommodating portion and the second accommodating portion. The method of claim 4, wherein The lead-out groove is a sound conversion device, characterized in that formed stepped with respect to the diaphragm seating portion formed in the frame. The method of claim 4, wherein The first and second grooves are acoustic conversion apparatus, characterized in that formed to face each other. The method of claim 4, wherein And the first groove is a pair of grooves separated from each other by a support plate, and the second groove has an inner groove for receiving the support plate. The method of claim 4, wherein The second groove is an acoustic transducer, characterized in that it has an inner projection that is inserted into the first groove.

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