KR20010079380A - Bidirectional Speaker for Folder Type Mobile Phone - Google Patents

Abstract

PURPOSE: A bi-directional speaker is provided, in which the receiver and speaker use magnets having opposite polarity, to thereby maximize magnetic efficiency and obtain a high efficiency and flat frequency characteristics. CONSTITUTION: A bi-directional speaker comprises a receiver and a speaker, which are integrated into a single body. The receiver includes a common yoke(12) having first and second outer periphery portions, first and second inner periphery portions and first and second recesses; the first magnet(11) mounted at the bottom of the first recess of the common yoke, and which generates the first non-alternating magnetic field; the first plate(14) mounted onto the first magnet, and which forms the first magnetic gap(G11) between the outer periphery of the first plate and the first inner periphery portion of the common yoke; the first coil(17) for generating the first alternating magnetic field upon applying of the first driving signal from an external source, and which is disposed in the first magnetic gap; the first vibration plate(16) an outer periphery of which is supported at the bottom of the second recess of the yoke so as to generate sound corresponding to the first driving signal when the first coil shifts location in a vertical direction. The speaker includes a support frame(20) which accommodates the second outer periphery portion of the common yoke, and has third, fourth and fifth recesses; the second magnet(13) mounted at the bottom of the third recess of the support frame, and which generates the second non-alternating magnetic field; the second plate(15) mounted onto the second magnet, and which forms the second magnetic gap(G12); the second coil(19) for generating the second alternating magnetic field upon applying of the second driving signal; and the second vibration plate(18) an outer periphery of which is supported at the bottom of the fifth recess of the frame so as to generate sound corresponding to the second driving signal when the second coil shifts location in a vertical direction.

Description

Bidirectional Speaker for Folder Type Mobile Phone}

The present invention relates to a bidirectional speaker for a clamshell mobile communication terminal. Particularly, a receiver and a speaker having independent sound reproduction functions inside and outside the yoke while sharing a single yoke are used to maximize magnetic efficiency by using magnets having opposite polarities. The present invention relates to a bidirectional speaker having a high frequency, high power, high efficiency, and a flat frequency characteristic as a slip type structure.

In general, sound regenerators are used for horn speakers, hi-fi audio systems such as component systems, system speakers consisting of woofers, midrange and tweeters covering a certain frequency band, and general speakers covering all frequency bands in one unit. Micro-speakers with ultra-lightweight and ultra-slim structures, such as ultra-compact camcorders and walkmens, receivers used in mobile communication terminals, earphones having a structure in which some are inserted into the ear, and buzzers that receive only frequencies in specific bands. do.

On the other hand, in recent years, mobile communication terminals have been developed in the form of flip and clamshell products in accordance with the trend of miniaturization of batteries and large displays. The clamshell mobile communication terminal is composed of a cover having a display mounted therein and a body provided with a plurality of keypads therein.

In this case, the conventional mobile communication terminal is provided with one external speaker and one internal receiver, respectively, when a call is detected on the terminal, the external speaker is operated to give a ringtone to notify the user of the call, and the user opens the cover. Listening to the caller through the receiver. In addition, the external speaker is destined to reproduce not only a simple ringtone but also various audio signals with a large sound pressure like an orchestra according to the development of communication technology and the Internet.

In the case of adopting the separate type 1 speaker-1 receiver, the independent performance is shown to show the best performance such as frequency characteristics, but the unit price is relatively high and occupies a lot of space of the terminal, which gradually leads to miniaturization. It is not a suitable solution for the trend.

The conventional bidirectional speaker proposed to solve this problem is a yoke which extends from the N pole of the magnet 1 to one annular magnet 1 and protrudes into the central space of the magnet 1 as shown in FIG. (2) is coupled to form a first magnetic gap (G1) on one side, the plate (3) extending from the S pole of the magnet (1) extends to the north pole of the magnet along the interior of the support frame (8) The first magnetic gap G2 is formed. The voice coil 5 coupled with the receiver diaphragm 4 is inserted into the first magnetic gap G1, and the voice coil 7 coupled with the diaphragm 6 for the speaker is inserted into the second magnetic gap G2. It is. In FIG. 1, reference numerals 9a and 9b denote diaphragm protection protectors, and 10 denotes a terminal board.

Therefore, while the conventional bidirectional speaker has the advantage of low component count, the receiver R1 and the speaker S1 are implemented using a single small magnet 1, and thus the diaphragm 4 and 6 according to Fleming's left hand law. Since the magnetic force for driving the power amplifier is relatively small, as a result, the input of the driving signal input to the voice coils 5 and 7 of the receiver R1 and the speaker S1 cannot be made large, resulting in a low output sound pressure. . In addition, the speaker is not supplied with a magnetic force from the magnet smoothly, the sound efficiency (SPR) of the speaker is reduced.

On the other hand, in general, when the DC magnetic flux of the permanent magnet is relatively smaller than the rotor magnetic field of the coil, the linearity of the DC magnetic flux flowing from the plate to the yoke occurs. Generates third harmonic distortion.

However, in spite of the small magnetic force, in contrast, when the input is increased, the third harmonic distortion phenomenon occurs while the middle portion of the frequency characteristic does not exhibit a flat characteristic.

In addition, the conventional two-way speaker needs to maintain the height of the magnet relatively high because the magnetic force of the receiver (R1) and the speaker (S1) should be provided as a single annular magnet (1). Indicates the height of about 5-6 mm. As a result, there is a problem that cannot supply a slim size product.

Accordingly, the present invention has been made in view of the problems of the prior art, and its object is that a receiver and a speaker having a sound reproduction function independent of the inside and the outside of the yoke while sharing a single yoke are magnetized by using magnets of opposite polarities. In order to maximize efficiency, the present invention provides a bidirectional speaker that exhibits high efficiency and flat frequency characteristics without third-order distortion.

Another object of the present invention is to provide a two-way speaker that implements a high input, high output as a slim structure that can effectively place each component within the same size and at the same time allocate the maximum volume of the magnet employed.

Another object of the present invention is to provide a bidirectional speaker having two first and second receivers or two first and second speakers using the bidirectional speaker structure.

1 is a cross-sectional view of a conventional two-way speaker for a clamshell mobile communication terminal,

2 is a cross-sectional view of a bidirectional speaker according to the present invention;

3 is an exploded view of FIG.

4A and 4B are a plan view and a rear view of FIG. 2.

* Explanation of Signs of Major Parts of Drawings *

11; First magnet 12; York

12; Yoke 12a; Outer neck

12b, 21a-21e, 26; Sound emission holes 12c and 12d; floor

13; Second magnet 14; First plate

15; Second plate 16,18; tympanum

17,19; Voice coil 20; Support frame

20a-20c; Groove 21,22; Protectors

23,24; Cushion 25; Terminal board

25a, 25b; Electrode pads G11 and G12; Magnetic gap

M1, M2; Magnetic circuit R11; receiver

S11; speaker

According to a first aspect of the present invention for achieving the above object, the present invention is a bidirectional speaker having a receiver and a speaker integrally, the receiver is the first and second outer diameter portion and the first and second inner diameter portion A common yoke having two stages of the first and second grooves corresponding to the first and second inner diameter portions to have a first magnet, and a first magnet mounted to the bottom of the first groove of the common yoke to generate a first comparative magnetic field; And a first plate mounted on an upper portion of the first magnet to form a first magnetic gap between an outer circumferential portion and an upper end of the first inner diameter portion of the common yoke, and a first alternating current when an electrical first driving signal is applied from the outside. A first coil that generates a magnetic field and is disposed in the first magnetic gap and displaces up and down according to interaction with a first comparative magnetic field generated from a first magnet, and the first coil is supported and an outer circumference portion of the yoke The first coil supported on the bottom of the second groove When displaced up and down and composed of a first diaphragm that is a sound corresponding to the first drive signal is generated;

The speaker may include a support frame inserted and coupled to the center of the second outer diameter portion of the common yoke and forming third to fifth grooves corresponding to the third to fifth inner diameter portions in a direction opposite to the first and second grooves. And an annular second magnet mounted on the bottom of the third recess located at the top of the support frame to generate a second comparative magnetic field, and mounted on top of the second magnet and having an inner circumferential portion and a first outer diameter portion of the common yoke. An annular second plate for forming a second magnetic gap between the lower ends and a second alternating magnetic field when an electrical second driving signal is applied from the outside and disposed in the second magnetic gap to be generated from the second magnet; A second coil that is displaced up and down according to the interaction with the second comparative magnetic field, and the second coil is supported and the outer circumferential part is supported by the fifth recess bottom of the frame to displace the second coil up and down. On the second drive signal It provides a two-way speaker comprising a second vibration plate for generating a corresponding sound.

In this case, the first magnet, the common yoke and the first plate form a first magnetic circuit for the receiver including a first magnetic gap, and the second magnet, the common yoke and the second plate include a second magnetic gap. And a second magnetic circuit for the speaker, wherein the first and second comparative magnetic fields generated by the first and second magnets of the first and second magnetic circuits are compared with each other through the common yoke. To increase the magnetic field, the first and second magnets are set to the same polarity of each polarity in contact with the common yoke.

Preferably, the bottom of the second groove and the first plate of the common yoke are set to the same level, and the bottom of the common yoke and the bottom of the second plate are set to the same level.

Furthermore, when the first grooves and the third grooves are set to the same depth and the first and second magnets are positioned at the same level, the first grooves and the third grooves form an effective first and second magnetic gaps and at the same time have a slim structure. .

According to the second aspect of the present invention, the present invention is formed with two first and second grooves corresponding to the first and second inner diameter portions to have the first and second outer diameter portions and the first and second inner diameter portions. The common yoke and the second outer diameter portion of the common yoke are inserted and coupled to the center, and form the third to fifth grooves corresponding to the third to fifth inner diameter portions in the opposite directions to the first and second grooves. A first magnet mounted on a support frame, a first recess bottom of the common yoke to generate a first comparative magnetic field, and a second magnet mounted on a bottom of a third recess located at the top of the support frame to generate a second comparative magnetic field; A first plate for forming a first magnetic gap between an annular second magnet, an upper portion of the first magnet, and an outer peripheral portion and an upper end of the first inner diameter portion of the common yoke, and an upper portion of the second magnet; Between the inner circumference and the lower end of the first outer diameter of the common yoke. To form an annular second plate and a first alternating magnetic field generated when the first driving signal is applied from the outside and disposed in the first magnetic gap and generated from the first magnet. Mutually with the first coil which is displaced up and down according to the second coil and the second non-magnetic field generated from the second magnet by generating a second alternating magnetic field when the second driving signal is applied from the outside. When the first coil is displaced up and down and the first coil is supported and the outer circumferential part is supported on the bottom of the second groove of the yoke and the first coil is displaced up and down according to the operation, the sound corresponding to the first driving signal is The first vibration plate and the second vibration plate which are supported and the outer circumferential part are supported on the bottom of the fifth groove of the frame to generate a sound corresponding to the second driving signal when the second coil is displaced up and down Consists of the above The first magnet, the common yoke and the first plate form a first magnetic circuit for the receiver including a first magnetic gap, and the second magnet, the common yoke and the second plate comprise a second magnetic gap. A magnetic circuit is formed, and the first and second comparative magnetic fields generated by the first and second magnets respectively increase the second and first comparative magnetic fields of the second and first magnetic circuits through a common yoke. The first and second magnets provide bidirectional speakers, wherein each polarity is set to a polarity opposite to each other.

According to a third aspect of the present invention, the present invention is provided with two first and second grooves corresponding to the first and second inner diameter portions to have the first and second outer diameter portions and the first and second inner diameter portions. And a magnetic yoke receiver formed inside the common yoke using the common yoke as the support frame and the yoke, and an external speaker formed on the opposite side of the common yoke using the common yoke as the yoke. It provides a bidirectional speaker.

According to a fourth aspect of the present invention, the present invention has a common configuration in which two first and second grooves corresponding to the first and second inner diameter portions are formed to have the first and second outer diameter portions and the first and second inner diameter portions. A yoke, an inner magnetic first receiver formed inside the common yoke using the common yoke as the support frame and the yoke, and an external magnetic second receiver formed on the opposite surface of the common yoke using the common yoke as the yoke. It provides a two-way speaker characterized in that.

According to a fifth aspect of the invention, the present invention is a common in that the first and second outer diameter portion and the first and second inner diameter portion having two stages corresponding to the first and second inner diameter portion is formed in common A yoke, a first magnetic speaker formed inside the common yoke using the common yoke as the support frame and the yoke, and an external magnetic second speaker formed on the opposite side of the common yoke using the common yoke as the yoke. It provides a two-way speaker characterized in that.

As described above, in the present invention, a receiver and a speaker having independent sound reproduction functions on the inside and outside of the yoke while sharing a single yoke are configured to maximize magnetic efficiency by using two magnets having opposite polarities. It exhibits a flat frequency characteristic with no input / high output, high efficiency, and no third-order distortion.

(Example)

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a cross-sectional view of the bidirectional speaker according to the present invention, FIG. 3 is an exploded view of FIG. 2, and FIGS. 4A and 4B are a plan view and a rear view of FIG. 2.

First, referring to FIGS. 2 and 3, the bidirectional speaker according to the present invention is, for example, a cylindrical first in which the N pole is located on the bottom 12c of the yoke 12 of the two-stage groove structure which also serves as a support frame. The magnet 11 is mounted, and the first plate 14 is installed on the S pole surface of the first magnet 11 so that the first magnetic gap G11 between the bent portion of the yoke 12 and the first plate 14. ) Is formed, and the first voice coil 17 coupled with the diaphragm 16 for the receiver is inserted into the first magnetic gap G11 to form the receiver R11.

In addition, the speaker S11 has a structure in which the three-stage grooves 20a, 20b, and 20c are formed in the downward direction and has a support frame 20 through which the center part is penetrated. The upper outer diameter portion 12a of the yoke portion of the receiver R11 is inserted and coupled to the center portion through which the support frame 20 is penetrated, and the second magnet 13 and the second magnet 13 are formed on the bottom of the upper recess 20a. The plates 15 are sequentially stacked in a downward direction, and a second magnetic gap G12 is formed between the lower end of the yoke 12 and the corresponding second plate 15 to form a second magnetic gap G12. The second voice coil 19 coupled to the diaphragm 18 for the speaker is inserted.

In this case, preferably, the height between the bottom 12c of the yoke 12 and the top recess bottom 12d is the same height as the height of the magnets 11 and 13 and the plates 14 and 15 (ie, the first and Setting the second magnets 11 and 13 to be located at the same level as each other forms an effective magnetic gap G11 and G12, and is necessary to achieve a slim structure.

2 and 4a, the receiver R11 includes a plurality of upward sound emission holes 21a-21e formed in the first protector 21 supported by the groove of the yoke 12, and in the yoke 12. A plurality of downward sound emitting holes 12b are formed. In addition, the speaker S11 has a plurality of upward sound emission holes 26 formed along the outer side of the support frame 20, and the central opening of the second protector 22 serves as a downward sound emission hole downward. .

On the other hand, one side of the support frame 20 extends from the first and second voice coils 17 and 19 of the receiver R11 and the speaker S11, and the front end is soldered, and the coils 17 and 19 are driven. To this end, a terminal board 25 made of a PCB to which a driving signal from a terminal body is applied is coupled. That is, a receiver electrode pad 25a is formed on an upper surface of the terminal board 25, and a speaker electrode pad 25b is formed on a lower side thereof and connected to the coils 17 and 19, respectively.

In addition, the first and second protectors 21 and 22 are equipped with annular cushions 23 and 24 for mitigating impact when mounted on the main body, respectively.

Bidirectional speaker according to the present invention configured as described above can be implemented in a slim structure of the height (T) of 3.3mm when the outer diameter (R) is 17 ??, overall adopted in the bidirectional speaker despite the slim structure as a whole The volume of the magnets 11 and 13 has been increased by at least twice as compared with the prior art.

To this end, in the present invention, the yoke 12 serving as a support frame of the receiver R11 is simultaneously applied to the magnets 11 and 13 of the receiver R11 and the speaker S11 separately. And the first magnet 11 mounted on the inner bottom of the yoke 12 to constitute the magnetic receiver R11 and the outer bottom of the yoke 12 to constitute the external speaker S11 (ie, The polarities of the second magnets 13 mounted on the bottom surface) were set to be opposite to each other.

That is, as shown in FIG. 2, the mounting directions of the N poles of the magnets 11 and 13 face each other in opposite directions, so that the polarities of the magnets 11 and 13 mounted on the yoke 12 are equal to each other. (In this case, it is of course also possible for the S poles to be mounted on the yoke 12 in the same manner as each other.

As a result, in the present invention, as shown in FIG. 2, the receiver magnetic circuit M1 includes the first magnet 11, the yoke 12, and the first plate 14, and the speaker magnetic circuit M2 includes the second magnet. It consists of the magnet 13, the yoke 12 and the second plate 15 and at the same time share the same yoke 12 and the polarity of the magnets (11, 13) is set to the opposite polarity, so that the first and second magnetic The DC magnetic fields of the circuits M1 and M2 affect the directions of increasing the magnetic fields of the other magnetic circuits M1 and M2, respectively.

On the other hand, the voice coils 17 and 19 inserted into the first magnetic gap G11 and the second magnetic gap G12 are alternatingly rotated according to the first and second driving signals applied from the main body of the mobile communication terminal. It generates a magnetic field.

As a result, Fleming's left-hand law acts between the first and second coils 17 and 19 and the first and second magnetic circuits M1 and M2, respectively, resulting in vertical displacement of the coils. The combined diaphragms 16 and 18 also vibrate together, resulting in a dense wave of air resulting in sound.

In the above-described embodiment, although the input to the voice coils 17 and 19 increases relatively with the increase in the magnetic flux as the volume of the entire magnets 11 and 13 employed in the two-way speaker is absolutely increased as compared with the prior art. Original sound reproduction, which exhibits a flat frequency characteristic without third harmonic distortion, can be obtained from the diaphragms 16 and 18, and as a result, the effect of higher power (i.e., at least two times or more sound pressure increase) is higher than that of the prior art. ) Is obtained.

Furthermore, the first and second magnets 11 and 13 interact with each other in the direction of increasing the magnetic field to the first and second magnetic circuits M1 and M2, thereby greatly improving the conversion efficiency SPL of the speaker.

In general, the second driving signal applied to the speaker S11 to notify the user call in the current mobile communication terminal is a melody signal of 16 chords, and the first driving signal applied to the receiver R11 is a voice signal of the caller.

In this case, the mobile communication terminal selectively operates the receiver R11 and the speaker R11. However, even when the receiver R11 and the speaker R11 are operated at the same time, the mobile communication terminal is connected to the first and second magnetic circuits M1 and M2. The intensity of the applied magnetic field is selectively determined by the magnetic field combination of each of the first magnet 11 and the second magnet 13, similarly to the case of operating the receiver R11 and the speaker R11.

Meanwhile, the bidirectional speaker having the structure of one receiver (R11) -1 speaker (S11) shown in the above-described embodiment is a bidirectional speaker having two first and second receivers or two first and second speakers. Modifications can also be readily made by those skilled in the art.

That is, when the area of the diaphragm 18 is relatively reduced in the speaker S11 of the embodiment, a bidirectional speaker having two first and second receivers may be configured, and the diaphragm (in the receiver R11 of the embodiment) may be configured. Relatively increasing the area of 16) may constitute a bidirectional speaker having two first and second speakers.

As described above, in the present invention, a receiver and a speaker having independent polarity reproducing functions on the inside and outside of the yoke while sharing a single yoke while simultaneously using the space efficiently increase the volume of the magnet. As it is configured to maximize the magnetic efficiency, it is slim and shows a flat frequency characteristic without high input / high output, high efficiency and third harmonic distortion.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (10)

In the bidirectional speaker provided with a receiver and a speaker, The receiver includes a common yoke having two stages of first and second grooves corresponding to the first and second inner diameter portions to have the first and second outer diameter portions and the first and second inner diameter portions; A first magnet mounted to a bottom of the first yoke of the common yoke and generating a first comparative magnetic field; A first plate mounted on an upper portion of the first magnet and forming a first magnetic gap between an outer circumferential portion and an upper end of the first inner diameter portion of the common yoke; A first alternating magnetic field is generated when an electrical first driving signal is applied from the outside and is disposed in the first magnetic gap and is displaced up and down according to interaction with a first comparative magnetic field generated from the first magnet. Coils, A first vibration plate which is supported by the first coil and whose outer circumference is supported by the bottom of the second groove of the yoke so that a sound corresponding to the first driving signal is generated when the first coil is displaced up and down; The speaker has a second outer diameter portion of the common yoke is inserted into the center and the support frame for forming the third to fifth grooves corresponding to the third to fifth inner diameter portion in the opposite direction to the first and second grooves and, An annular second magnet mounted to a bottom of a third recess located at the top of the support frame to generate a second comparative magnetic field; An annular second plate mounted on an upper portion of the second magnet to form a second magnetic gap between an inner circumferential portion thereof and a lower end of the first outer diameter portion of the common yoke; A second alternating magnetic field is generated when an electric second driving signal is applied from the outside and is disposed in the second magnetic gap and is displaced up and down according to interaction with a second comparative magnetic field generated from the second magnet. Coils, The second coil is supported and the outer periphery is supported by the bottom of the fifth groove of the frame is characterized in that the second vibration plate which is generated when the second coil is displaced up and down the sound corresponding to the second drive signal Two-way speaker. The method of claim 1, wherein the first magnet, the common yoke and the first plate form a first magnetic circuit for a receiver including a first magnetic gap, The second magnet, the common yoke and the second plate forms a second magnetic circuit for the speaker including a second magnetic gap, The first and second comparative magnetic fields generated by the first and second magnets of the first and second magnetic circuits respectively increase the comparative magnetic fields of the other magnetic circuits through a common yoke. Is bidirectional speaker, characterized in that each of the polarity in contact with the common yoke is set to the same polarity. The second yoke bottom and the first plate of the common yoke are set to the same level, and the bottom of the common yoke and the bottom of the second plate are set to the same level. Two way speaker. The method according to claim 1 or 2, wherein the first groove and the third groove are set to the same depth with each other, and the first and second magnets are positioned at the same level with each other to form an effective first and second magnetic gap. And at the same time a bidirectional speaker characterized in that a slim structure. The method of claim 1, wherein the receiver is supported by the groove of the common yoke to protect the inside of the receiver further comprises a first protector formed with a plurality of upward sound emission holes, the speaker protects the inside of the speaker and downward sound emission holes Further comprising a second protector having a central opening formed therein; The common yoke has a plurality of downward sound emission holes for the receiver, The support frame is characterized in that a plurality of upward sound emitting holes for the speaker is formed along the outside. 2. The terminal board of claim 1, further comprising: a terminal board extending from first and second coils of the receiver and the speaker to one side of the support frame, and having a front end fixed thereto and applied with first and second driving signals for driving the coil; Two-way speaker, characterized in that it further comprises. A common yoke having two stages of first and second grooves corresponding to the first and second inner diameter portions to have the first and second outer diameter portions and the first and second inner diameter portions, A support frame inserted and coupled to the center of the second outer diameter portion of the common yoke and forming third to fifth grooves corresponding to the third to fifth inner diameter portions in a direction opposite to the first and second grooves; A first magnet mounted to a bottom of the first yoke of the common yoke and generating a first comparative magnetic field; An annular second magnet mounted to a bottom of a third recess located at the top of the support frame to generate a second comparative magnetic field; A first plate mounted on an upper portion of the first magnet and forming a first magnetic gap between an outer circumferential portion and an upper end of the first inner diameter portion of the common yoke; An annular second plate mounted on an upper portion of the second magnet to form a second magnetic gap between an inner circumferential portion thereof and a lower end of the first outer diameter portion of the common yoke; A first coil which generates a first alternating magnetic field when the first driving signal is applied from the outside, and is disposed in the first magnetic gap and displaces up and down according to interaction with the first comparative magnetic field generated from the first magnet; , A second coil that generates a second alternating magnetic field when the second driving signal is applied from the outside, and is disposed in the second magnetic gap and displaces up and down according to interaction with a second comparative magnetic field generated from the second magnet; , A first vibration plate supporting the first coil and having an outer circumferential portion supported at the bottom of the second groove of the yoke to generate a sound corresponding to the first driving signal when the first coil is displaced up and down; The second coil is supported and the outer peripheral portion is supported on the bottom of the fifth groove of the frame is composed of a second vibration plate that generates a sound corresponding to the second drive signal when the second coil is displaced up and down, The first magnet, the common yoke and the first plate for forming a first magnetic circuit for the receiver including a first magnetic gap, the second magnet, the common yoke and the second plate for a speaker comprising a second magnetic gap Forming a second magnetic circuit, The first and second comparative magnetic fields generated by the first and second magnets are respectively increased to increase the second and first comparative magnetic fields of the second and first magnetic circuits through a common yoke. Magnet is a two-way speaker, characterized in that each polarity is set to the opposite polarity. A common yoke having two stages of first and second grooves corresponding to the first and second inner diameter portions to have the first and second outer diameter portions and the first and second inner diameter portions, An inner magnetic receiver formed inside the common yoke using the common yoke as a support frame and a yoke; Bidirectional speaker, characterized in that consisting of an external speaker formed on the opposite side of the common yoke using the common yoke as a yoke. A common yoke having two stages of first and second grooves corresponding to the first and second inner diameter portions to have the first and second outer diameter portions and the first and second inner diameter portions, A first magnetic receiver formed inside the common yoke using the common yoke as the support frame and the yoke; And an external magnetic second receiver formed on an opposite surface of the common yoke using the common yoke as a yoke. A common yoke having two stages of first and second grooves corresponding to the first and second inner diameter portions to have the first and second outer diameter portions and the first and second inner diameter portions, A first magnetic speaker formed inside the common yoke using the common yoke as the support frame and the yoke; Two-way speaker characterized in that it is composed of a second external speaker formed on the opposite surface of the common yoke using the common yoke as a yoke.