KR100507700B1 - Speaker having double magnetism circuit structure - Google Patents

Abstract

The present invention relates to a speaker having a dual magnetic circuit structure, and more particularly to the windings on the upper and lower ends of the bobbin of the voice coil, and to provide a magnetic circuit so that a driving force can be generated in each of the winding coil than in the voice coil By generating high driving force, the sound output performance of the speaker can be greatly improved.

Description

Speaker with dual magnetic circuit structure {SPEAKER HAVING DOUBLE MAGNETISM CIRCUIT STRUCTURE}

The present invention relates to a speaker, and more particularly, to a speaker having a dual magnetic circuit structure in which magnetic circuits are disposed in the upper and lower portions on the center axis of the speaker, respectively, to improve the sound output reproduction performance.

In general, when a magnetic field is generated from a magnet and a magnetic loop is formed through a plate and a yoke, and a current flows through a voice coil placed in a magnetic circuit gap, the voice coil vibrates due to the interaction between the current and the magnetic field. The vibration plate coupled to the voice coil (aka 'conji') generates an acoustic signal and emits sound according to the vibration. These speakers are divided into magnetic and magnetic shapes according to the magnetic circuit configuration.

First, the external speaker is attached to a circular yoke 1 having a central protruding portion as shown in FIG. 1, a magnet 2 attached to an outer circumferential surface of the upper surface of the yoke 1, and an upper surface of the magnet 2. Voice coil 5 consisting of a plate 3, a frame 4 coupled to an upper surface of the plate 3, and windings and bobbins positioned in the space between the yoke 1 and the plate 3. ) And one end of the bobbin formed on the upper side of the voice coil 5 and the other end of the diaphragm 6 and the damper 7 coupled to the frame 4 and the voice coil 5 It consists of a center cap (8) bonded to the top. Here, the yoke 1, the magnet 2, and the plate 3 are collectively referred to as a magnetic circuit.

Referring to the operation of the conventional external magnetic speaker having the above configuration, first, the magnetic field generated from the magnet 2 passes through the magnetic circuit gap, which is a space portion between the yoke 1 and the plate 3, through the plate 3, and the yoke. When the magnetic flux is formed through (1) and a current flows through the voice coil 5 placed in the magnetic circuit gap, a driving force is generated and transmitted to the diaphragm 6 and the damper 7, and then the diaphragm 6 and the damper 7. ) Vibrates corresponding to the driving force of the voice coil 5, and the vibration signal of the diaphragm 6 and the damper 7 eventually generates an acoustic signal to generate sound waves.

As shown in FIG. 2, the inner speaker includes a circular yoke 10 that is bent to form a space portion at a central portion thereof, a magnet 20 attached to a bottom surface of the space portion of the yoke 1, and the magnet 20. Pole piece 30 attached to the upper surface of the), the frame 40 coupled to the upper surface of the yoke 10, the winding portion located in the space portion between the yoke 10 and the pole piece 30 and One end is attached to each side of the voice coil 50 composed of the bobbin and the bobbin formed on the upper part of the voice coil 50, and the other end thereof is provided with a diaphragm 60 and a damper 70 coupled to the frame 40. , The center cap 80 is bonded to the top of the voice coil 50. Here, the yoke 10, the magnet 20, and the pole piece 30 are collectively referred to as a magnetic circuit.

Looking at the operation of the conventional magnetic speaker made of the above configuration, first, the magnetic field generated from the magnet 20 passes through the magnetic circuit gap that is a space between the yoke 10 and the yoke 10 through the pole piece 30 When the magnetic flux is formed, a current flows through the voice coil 50 placed in the magnetic circuit gap, and a driving force is generated and transmitted to the diaphragm 60 and the damper 70. The diaphragm 60 and the damper 70 are voice coils. Vibration corresponds to the driving force of 50, and the vibration of the diaphragm 60 and the damper 70 eventually generates an acoustic signal to generate sound waves.

However, in order to increase the output sound pressure (SPL) of the conventional external or magnetic speaker, the magnetic force of the magnetic circuit must be strong, and since only a single configuration of the magnetic circuit is used, there is a limit in improving the performance of the magnetic circuit. In other words, it is possible to increase the size of the magnet to improve the performance of the magnetic circuit or to use a higher magnetic material, but when the magnetic flux value of the ground circuit is included, there is a problem that there is a limit that no further performance can be improved.

Therefore, an object of the present invention is to solve the above problems, and to form a winding portion on the upper and lower ends of the bobbin of the voice coil, respectively, by providing a magnetic circuit so that a driving force can be generated in each of the higher coil coil The driving force is generated to significantly improve the sound output performance of the speaker.

Features of the present invention for achieving the above object,

In the speaker,

A circular first yoke formed by bending the protruding center portion,

A first magnet formed in the shape of a flat plate and attached to the outer peripheral surface of the upper surface of the first yoke;

A plate formed in a flat ring shape and attached to an upper surface of the first magnet,

A frame formed to form an outer shape of the speaker and coupled to an upper surface of the plate;

A supporter coupled to an upper surface of the protrusion of the first yoke;

A pole piece formed in a coin shape and attached to an upper surface of the supporter;

A second magnet formed in a coin shape and attached to an upper surface of the pole piece;

A second yoke formed in a cylindrical shape having a lower end portion open so that the second magnet and the pole piece are accommodated in a bottom portion;

A voice coil comprising a winding part formed at an upper end and a lower end of a bobbin, wherein a lower winding part is positioned in a space between the first yoke and a plate, and an upper winding part is located in a space between the second yoke and a pole piece;

One end is bonded to the side of the bobbin of the voice coil, the other end is coupled to the frame and the vibration plate,

One end is bonded to the side of the bobbin of the voice coil, characterized in that it comprises a damper coupled to the other end to the frame.

Here, the supporter is fixed by the through bolts,

The protruding portion of the first yoke and the pole piece are formed with a bolt hole through which the through bolt is coupled.

Here also the lower winding and the upper winding of the voice coil,

Electrically connected.

Another feature of the invention,

In the speaker,

Circular yoke bent to form a space portion in the downward direction from the center,

A first magnet formed in a coin shape and attached to the space part of the yoke;

A first pole piece formed in a coin shape and attached to an upper surface of the first magnet,

A frame formed to form an outer shape of the speaker and coupled to an outer circumferential surface of an upper surface of the yoke;

A supporter coupled to an upper surface of the first pole piece;

A second pole piece formed in a coin shape and attached to an upper surface of the supporter;

A second magnet formed in a coin shape and attached to an upper surface of the second pole piece;

A second yoke formed in a cylindrical shape having a lower end portion open so that the second magnet and the second pole piece are attached to the bottom portion;

Voice coils having windings formed at upper and lower ends of bobbins, respectively, having lower windings in the space between the yoke and the first pole piece, and upper windings in the space between the second yoke and the second pole piece. and,

One end is bonded to the side of the bobbin of the voice coil, the other end is coupled to the frame and the vibration plate,

One end is bonded to the side of the bobbin of the voice coil, characterized in that it comprises a damper coupled to the other end to the frame.

Here, the supporter is fixed by the through bolts,

The first pole piece and the second pole piece are formed with a bolt hole through which the through bolt is coupled.

Here also the lower winding and the upper winding of the voice coil,

Electrically connected.

Another feature of the invention,

In the speaker,

A circular yoke formed by bending the center portion,

A first magnet formed in the shape of a flat plate and attached to the outer peripheral surface of the upper surface of the yoke;

A plate formed in a flat ring shape and attached to an upper surface of the first magnet,

A frame formed to form an outer shape of the speaker and coupled to an upper surface of the plate;

A supporter coupled to an upper surface of the protrusion of the yoke;

A second magnet formed in a coin shape and attached to an upper surface of the supporter;

It is composed of a bobbin formed in a cylindrical shape having a lower end opening, and a winding portion formed on a lower outer circumferential surface of the bobbin and an upper surface of the bobbin. The voice coil in which the upper winding is located,

One end is bonded to the side of the bobbin of the voice coil, the other end is coupled to the frame and the vibration plate,

One end is bonded to the side of the bobbin of the voice coil, characterized in that it comprises a damper coupled to the other end to the frame.

Here, the supporter is fixed by the through bolts,

The protrusion of the yoke is formed with a bolt hole through which the through bolt is coupled.

Here also the lower winding and the upper winding of the voice coil,

Electrically connected.

Another feature of the invention,

In the speaker,

Circular yoke bent to form a space portion in the downward direction from the center,

A first magnet formed in a coin shape and attached to the space part of the yoke;

A pole piece formed in a disc shape and attached to an upper surface of the first magnet,

A frame formed to form an outer shape of the speaker and coupled to an upper surface of the yoke;

A supporter coupled to an upper surface of the pole piece,

A second magnet formed in a coin shape and attached to an upper surface of the pole piece;

A bobbin formed in a cylindrical shape having a lower end portion and a winding portion formed on a lower outer circumferential surface and an upper surface of the bobbin, respectively, wherein the lower winding portion is positioned in a space between the yoke and the pole piece, and is spaced a predetermined distance from the upper surface of the second magnet. The voice coil in which the upper winding part is located,

One end is bonded to the side of the bobbin of the voice coil, the other end is coupled to the frame and the vibration plate,

One end is bonded to the side of the bobbin of the voice coil, characterized in that it comprises a damper coupled to the other end to the frame.

Here, the supporter is fixed by the through bolts,

The pole piece is formed with a bolt hole through which the through bolt is coupled.

Here, the lower winding portion and the upper winding portion of the voice coil,

Electrically connected.

Hereinafter, a configuration of a speaker having a dual magnetic circuit structure according to embodiments of the present invention will be described in detail with reference to FIGS. 3 to 6.

First Embodiment

3 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to the first embodiment of the present invention.

Referring to FIG. 3, a speaker 100 having a dual magnetic circuit structure according to the present invention includes a first yoke 110, a first magnet 120, a plate 130, a frame 140, The supporter 150, the pole piece 160, the second magnet 170, the second yoke 180, the voice coil 190, the diaphragm 200, and the damper 210 are formed.

The first yoke 110 is bent to form a central portion. Here, the bolt hole 102 is formed in the center of the protrusion of the first yoke 110.

The first magnet 120 is formed in a flat ring shape and attached to the outer peripheral surface of the upper surface of the first yoke 110.

The plate 130 is formed in a flat ring shape and attached to the upper surface of the first magnet 120.

The frame 140 is formed in the shape of a cone whose bottom portion is opened to form the outer shape of the speaker, and the bottom surface is coupled to the outer peripheral surface of the upper surface of the plate 130.

The supporter 150 has a bolt hole 102 formed to penetrate the through bolt 101 in the longitudinal direction about an axis, and is coupled to the upper surface of the protrusion of the first yoke 110 by the through bolt 101.

The pole piece 160 is formed in a coin shape and attached to an upper surface of the supporter 150. Here, the bolt hole 102 to which the through bolt 101 is fastened is formed at the center of the pole piece 160.

The second magnet 170 is formed in a coin shape is attached to the upper surface of the pole piece 160.

The second yoke 180 is formed in a cylindrical shape with a lower end opened to accommodate the second magnet 170 and the pole piece 160 at the bottom thereof. Here, the centers of the first yoke 110, the supporter 150, the pole piece 160, the second magnet 170 and the second yoke 180 are located on the same axis.

The voice coil 190 includes winding parts 192 and 193 formed at the top and bottom of the bobbin 191, respectively, so that the lower winding part 192 is provided in the space between the first yoke 110 and the plate 130. The upper winding unit 193 is positioned in a space between the second yoke 180 and the pole piece 160. Here, the lower winding portion 192 and the upper winding portion 193 of the voice coil 190 are electrically connected.

The diaphragm 200 is formed in a cone shape, and one end is bonded to the side surface of the bobbin 191 of the voice coil 190, and the other end is coupled to the frame 140.

The damper 210 has one end bonded to the side surface of the bobbin 191 of the voice coil 190, and the other end coupled to the frame 140.

Hereinafter, an operation of a speaker having a dual magnetic circuit structure according to the first embodiment of the present invention will be described in detail with reference to FIG. 3.

First, the magnetic field generated from the first magnet 120 passes through the magnetic circuit gap, which is a space portion between the first yoke 110 and the plate, through the first yoke 110 to form a magnetic flux through the first yoke 110, and the magnetic circuit A current flows through the voice coil 190 in which the lower winding portion 192 is located in the gap to generate a driving force. At the same time, the magnetic field generated from the second magnet 170 passes through the magnetic circuit gap, which is a space portion between the second yoke 180 and the pole piece 160, to form the magnetic flux through the second yoke 180. A current flows through the voice coil 190 in which the upper winding portion 193 is located in the magnetic circuit gap, and a driving force is generated. That is, since the current flows through the upper winding portion 193 and the lower winding portion 192 of the voice coil 190 at the same time, the driving force is generated, thereby exhibiting a more powerful driving force of the voice coil 190.

When the driving force is generated in the voice coil 190 and transmitted to the diaphragm 200 and the damper 210, the diaphragm 200 and the damper 210 vibrate in correspondence with the driving force of the voice coil 190, and the diaphragm The vibration of the 200 and the damper 210 eventually generates an acoustic signal to generate sound waves.

Second Embodiment

4 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to the second embodiment of the present invention.

Referring to FIG. 4, a speaker 300 having a dual magnetic circuit structure according to the present invention includes a first yoke 310, a first magnet 320, a first pole piece 330, and a frame 340. ), Supporter 350, second pole piece 360, second magnet 370, second yoke 380, voice coil 390, diaphragm 400 and damper 410. It consists of.

The yoke 310 is bent to form a space portion in the downward direction from the center portion, it is made in a circular shape.

The first magnet 320 is formed in a coin shape and attached to the space portion of the yoke 310.

The first pole piece 330 is formed in a coin shape and attached to an upper surface of the first magnet 320. Here, the bolt hole 302 is formed in the center of the first pole piece 330.

The frame 340 is formed in the shape of a cone whose bottom portion is opened to form an outer shape of the speaker, and the bottom is coupled to the outer peripheral surface of the upper surface of the yoke 310.

The supporter 350 has a bolt hole 302 formed to penetrate the through bolt 301 in a longitudinal direction about an axis, and is coupled to the bolt hole 302 and the through bolt 301 of the first pole piece 330. Is fastened by

The second pole piece 360 is formed in a coin shape and attached to the top surface of the supporter 350. Here, a bolt hole 302 to which the through bolt 301 is fastened is formed at the center of the second pole piece 360.

The second magnet 370 is formed in a coin shape and attached to the upper surface of the second pole piece 360.

The second yoke 380 is formed in a cylindrical shape with an open lower end so that the second magnet 370 and the second pole piece 360 are accommodated in the bottom. Here, the yoke 310, the first magnet 320, the first pole piece 330, the supporter 350, the second pole piece 360, the second magnet 370 and the second yoke Each center of 380 is located on the same axis.

The voice coil 390 is composed of winding parts 392 and 393 formed at the upper and lower ends of the bobbin 391, respectively, and the lower winding part 392 is formed in the space between the yoke 310 and the first pole piece 330. Is positioned, and an upper winding portion 393 is positioned in a space between the second yoke 380 and the second pole piece 360. Here, the lower winding portion 392 and the upper winding portion 393 of the voice coil 390 are electrically connected.

The diaphragm 400 is formed in a cone shape so that one end is bonded to the side surface of the bobbin 391 of the voice coil 390, and the other end is coupled to the frame 340.

One end of the damper 410 is bonded to the side surface of the bobbin 391 of the voice coil 390, and the other end of the damper 410 is coupled to the frame 340.

Hereinafter, an operation of a speaker having a dual magnetic circuit structure according to a second embodiment of the present invention will be described in detail with reference to FIG. 4.

First, the magnetic field generated from the first magnet 320 passes through the magnetic circuit gap, which is a space portion between the first yoke 310 and the first yoke 310, to form a magnetic flux through the first yoke 310. In addition, a current flows through the voice coil 390 in which the lower winding part 392 is located in the magnetic circuit gap, and a driving force is generated. At the same time, the magnetic field generated from the second magnet 370 passes through the magnetic circuit gap, which is a space portion between the second yoke 380 and the second yoke 380, to form the magnetic flux through the second yoke 380. Then, a current flows through the voice coil 390 in which the upper winding part 393 is located in the magnetic circuit gap, and a driving force is generated. That is, since the current flows through the upper winding portion 393 and the lower winding portion 392 of the voice coil 390 at the same time, the driving force is generated, thereby exhibiting a stronger driving force of the voice coil 390.

When a driving force is generated in the voice coil 390 and transmitted to the diaphragm 400 and the damper 410, the diaphragm 400 and the damper 410 vibrate in response to the driving force of the voice coil 390. The vibration of the 400 and the damper 410 eventually generates an acoustic signal to generate sound waves.

Third Embodiment

5 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to a third embodiment of the present invention.

Referring to FIG. 5, a speaker 500 having a dual magnetic circuit structure according to the present invention includes a yoke 510, a first magnet 520, a plate 530, a frame 540, and a supporter ( 550, a second magnet 560, a voice coil 570, a diaphragm 580, and a damper 590.

The yoke 510 is bent to form a central portion. Here, the bolt hole 502 is formed in the center of the protrusion of the yoke 510.

The first magnet 520 is formed in a flat ring shape and attached to the outer peripheral surface of the upper surface of the yoke 510.

The plate 530 is formed in a flat ring shape and attached to an upper surface of the first magnet 520.

The frame 540 is formed in the shape of a cone whose bottom portion is open to form an outer shape of the speaker, and the bottom is coupled to the outer peripheral surface of the upper surface of the plate 530.

The supporter 550 is formed with a bolt hole 502 so that the through bolt 501 penetrates in the longitudinal direction about the axis, and the through bolt 501 penetrates the bolt hole 502 at the bottom of the protrusion of the yoke 510. Are combined by.

The second magnet 560 is formed in the form of a coin is attached to the upper surface of the supporter 550.

The voice coil 570 is composed of a bobbin 571 formed in a cylindrical shape having an open lower end, and winding portions 572 and 573 formed on the lower outer circumferential surface and the bottom of the upper surface of the bobbin 571, respectively, to provide the yoke 510 and the plate ( The lower winding portion 572 is positioned in the space portion between the 530, and the upper winding portion 573 is positioned at a predetermined distance from the upper surface of the second magnet 560. Here, the lower winding portion 572 and the upper winding portion 573 of the voice coil 570 is electrically connected. Here, the centers of the yoke 510, the supporter 550, the second magnet 560 and the voice coil 570 are located on the same axis.

The diaphragm 580 is formed in a cone shape so that one end is bonded to the side surface of the bobbin 571 of the voice coil 570, and the other end is coupled to the frame 540.

One end of the damper 590 is bonded to the side surface of the bobbin 571 of the voice coil 570, and the other end is coupled to the frame 540.

Hereinafter, an operation of a speaker having a dual magnetic circuit structure according to a third embodiment of the present invention will be described in detail with reference to FIG. 5.

First, the magnetic field generated from the first magnet 520 passes through the magnetic circuit gap, which is a space portion between the yoke 510 and the plate 530, to form a magnetic flux through the yoke 510, and the lower winding in the magnetic circuit gap. A current flows through the voice coil 570 where the unit 572 is located to generate a driving force. At the same time, a magnetic force generated from the second magnet 560 flows into the voice coil 570 in which the upper winding part 573 is located in the magnetic circuit gap, which is an upper space part of the second magnet 560, thereby generating a driving force. That is, since the current flows simultaneously through the upper winding portion 573 and the lower winding portion 572 of the voice coil 570, the driving force of the voice coil 570 is exhibited more powerfully.

When the driving force is generated in the voice coil 570 and transmitted to the diaphragm 580 and the damper 590, the diaphragm 580 and the damper 590 vibrate in response to the driving force of the voice coil 570, and the diaphragm The vibration of the 580 and the damper 590 eventually generates an acoustic signal to generate sound waves.

Fourth Embodiment

6 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to the fourth embodiment of the present invention.

Referring to FIG. 6, a speaker 700 having a dual magnetic circuit structure according to the present invention includes a yoke 710, a first magnet 720, a pole piece 730, a frame 740, and a supporter. 750, a second magnet 760, a voice coil 770, a diaphragm 780, and a damper 790.

The yoke 710 is bent to form a space portion downward from the center portion.

The first magnet 720 is formed in a coin shape and attached to the space portion of the yoke 710.

The pole piece 730 is formed in a coin shape and attached to an upper surface of the first magnet 720. Here, the bolt hole 702 is formed in the center of the first pole piece 730.

The frame 740 is formed in the shape of a cone whose bottom portion is opened to form an outer shape of the speaker, and the bottom is coupled to the outer peripheral surface of the upper surface of the yoke 710.

The supporter 750 has a bolt hole 702 formed to penetrate the through bolt 701 in the longitudinal direction about an axis, and is fastened by coupling the bolt hole 702 of the pole piece 730 with the through bolt 701. do.

The second magnet 760 is formed in a coin shape and attached to the upper surface of the supporter 750.

The voice coil 770 is composed of a bobbin 771 formed in a cylindrical shape with an open lower end, and winding parts 772 and 773 formed on the lower outer circumferential surface and the bottom of the upper surface of the bobbin 771, respectively, to provide the yoke 710 and the pole piece. The lower winding part 772 is positioned in the space between the parts 730, and the upper winding part 773 is positioned at a predetermined distance from the upper surface of the second magnet 760. Here, the lower winding portion 772 and the upper winding portion 773 of the voice coil 770 are electrically connected. Here, the centers of the yoke 710, the first magnet 720, the pole piece 730, the supporter 750, the second magnet 760 and the voice coil 770 are located on the same axis. do.

The diaphragm 780 is formed in a cone shape, and one end is bonded to the side surface of the bobbin 771 of the voice coil 770, and the other end is coupled to the frame 740.

One end of the damper 790 is bonded to the side surface of the bobbin 771 of the voice coil 770, and the other end of the damper 790 is coupled to the frame 740.

Hereinafter, an operation of a speaker having a dual magnetic circuit structure according to a fourth embodiment of the present invention will be described in detail with reference to FIG. 6.

First, the magnetic field generated from the first magnet 720 passes through the magnetic circuit gap, which is a space portion between the yoke 710 and the pole piece 730, forms a magnetic flux through the yoke 710, and then the lower end within the magnetic circuit gap. A current flows through the voice coil 770 where the winding unit 772 is located to generate a driving force. At the same time, a magnetic force generated from the second magnet 760 flows into the voice coil 770 in which the upper winding part 773 is located in the magnetic circuit gap, which is the upper space part of the second magnet 760, thereby generating a driving force. That is, since the current flows through the upper winding portion 773 and the lower winding portion 772 of the voice coil 770 at the same time, the driving force is generated, thereby exhibiting a more powerful driving force of the voice coil 770.

When a driving force is generated in the voice coil 770 and transmitted to the diaphragm 780 and the damper 790, the diaphragm 780 and the damper 790 vibrate in response to the driving force of the voice coil 770. The vibration of the 780 and the damper 790 eventually generates an acoustic signal to generate sound waves.

Therefore, by forming the winding part in duplicate so that higher driving force can be generated in the voice coil, a relatively higher sound output can be obtained than the conventional speaker.

As described above, according to the speaker having the dual magnetic circuit structure according to the present invention, the windings are formed on the upper and lower ends of the bobbin of the voice coil, respectively, and the magnetic coil is provided so that a driving force can be generated in each winding. By generating higher driving force at, the sound output performance of the speaker can be greatly improved.

1 is a cross-sectional view showing an external magnetic speaker according to the prior art

2 is a cross-sectional view showing a magnetic speaker according to the prior art

3 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to the first embodiment of the present invention

4 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to a second embodiment of the present invention.

5 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to a third embodiment of the present invention

6 is a cross-sectional view showing the configuration of a speaker having a dual magnetic circuit structure according to the fourth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

101: through bolt 102: bolt hole

110: first yoke 120: first magnet

130: plate 140: frame

150: supporter 160: pole piece

170: second magnet 180: second yoke

190: voice coil 191: bobbin

192: lower winding 193: upper winding

200: diaphragm 210: damper

Claims (12)

A circular first yoke is formed in the form of a flat plate ring, the center portion is bent and protruded, the first magnet is attached to the outer peripheral surface of the upper surface of the first yoke, a plate formed in the shape of a flat plate ring attached to the upper surface of the first magnet, The voice coil is formed to form the outer shape of the speaker and is coupled to the upper surface of the plate, the bobbin and the winding portion formed on the lower end of the bobbin and the lower winding portion is located in the space portion between the first yoke and the plate, In the speaker having one end is bonded to the side of the bobbin and the other end is bonded to the frame, one end is bonded to the side of the bobbin and the other end is coupled to the frame, A supporter coupled to an upper surface of the protrusion of the first yoke, a pole piece formed in a coin shape and attached to an upper surface of the supporter, a second magnet formed in a coin shape and attached to an upper surface of the pole piece, the pole piece and the first A cylindrical second yoke having a lower end opened so that two magnets are accommodated and attached to the bottom, and an upper winding part formed at an upper end of the bobbin and electrically connected to the lower winding part, The upper winding portion of the voice coil is located in the space portion between the second yoke and the pole piece, And the first yoke, the supporter, and the pole piece are integrally coupled by a through bolt. delete delete Circular yoke bent to form a space portion in the downward direction from the center portion, the first magnet is formed in the form of a coin attached to the space portion of the yoke, the first pole piece formed in the form of a coin attached to the upper surface of the first magnet And a frame formed to form an outer shape of the speaker and coupled to an outer circumferential surface of the yoke, a bobbin and a winding portion formed at a lower end of the bobbin, and the lower winding portion formed in a space between the first yoke and the first pole piece. In the speaker having a voice coil located, one end is bonded to the side of the bobbin and the other end is coupled to the frame, one end is bonded to the side of the bobbin and the other end is coupled to the frame, A supporter coupled to an upper surface of the first pole piece, a second pole piece formed in a coin shape and attached to an upper surface of the supporter, a second magnet formed in a coin shape and attached to an upper surface of the second pole piece, and the second A cylindrical second yoke having a lower end opened so that the second pole piece and the second magnet are accommodated and attached to the bottom, and an upper winding part formed at an upper end of the bobbin and electrically connected to the lower winding part, The upper winding portion of the voice coil is located in the space portion between the second yoke and the second pole piece, And the first pole piece, the supporter, and the second pole piece are integrally coupled by a through bolt. delete delete A circular yoke formed by bending a central portion and formed in a flat ring shape, the first magnet is attached to the outer peripheral surface of the upper surface of the yoke, a plate is formed in the shape of a flat ring and is attached to the upper surface of the first magnet, and the external shape of the speaker. It is formed to form a frame coupled to the upper surface of the plate, the bobbin and the winding portion formed on the lower end of the bobbin, the voice coil in which the lower winding portion is located in the space portion between the yoke and the plate, one end on the side of the bobbin In the speaker having a diaphragm bonded to the other end is coupled to the frame, one end is bonded to the side of the bobbin and the other end is coupled to the frame, The supporter coupled to the upper surface of the protrusion of the yoke, has a second magnet formed in the shape of a coin attached to the upper surface of the supporter, The bobbin of the voice coil is provided in a cylindrical shape to receive the supporter and the second magnet at a bottom thereof, and an upper winding part electrically connected to the lower winding part is formed at a bottom of an upper surface thereof. The yoke and the supporter is a speaker having a dual magnetic circuit structure, characterized in that integrally coupled by a through bolt. delete delete Circular yoke bent to form a space portion in the downward direction from the center portion, the first magnet is formed in the form of a coin attached to the upper space portion of the yoke, the pole piece is formed in the form of a coin attached to the upper surface of the first magnet, The voice coil is formed to form an outer shape of the speaker and is coupled to an upper surface of the plate, a bobbin and a winding portion formed at a lower end of the bobbin, and the lower winding portion is located in a space portion between the yoke and the pole piece. In the speaker having one end is bonded to the side of the bobbin and the other end is bonded to the frame, one end is bonded to the side of the bobbin and the other end is coupled to the frame, Supporter coupled to the upper surface of the pole piece, has a second magnet formed in the form of a coin attached to the upper surface of the pole piece, The bobbin is provided in a cylindrical shape and accommodates the supporter and the second magnet in a bottom portion, and a top winding portion electrically connected to the bottom winding portion is formed on a bottom of an upper surface thereof. The pole piece and the supporter is a speaker having a dual magnetic circuit structure, characterized in that integrally coupled by a through bolt. delete delete