KR101596891B1 - Electromagnetic drive slim speaker - Google Patents

Abstract

The present invention relates to an electromagnetic driving slim speaker which can reproduce a delicate sound from low to high note regions, and can significantly reduce the manufacturing costs by simplifying a manufacturing process. According to the present invention, the electromagnetic driving slim speaker comprises: an upper magnet; a lower magnet arranged in a lower part of the upper magnet; a vibration plate with a magnetic material wherein a part of the vibration plate is disposed between the upper and lower magnets; an upper driving coil arranged to be separated in an upper part of the vibration plate; a lower driving coil arranged to be separated in a lower part of the vibration plate; an upper yoke arranged to be in contact with the upper magnet; and a lower yoke arranged to be in contact with the lower magnet.

Description

ELECTROMAGNETIC DRIVE SLIM SPEAKER [0002]

[0001] The present invention relates to a slim speaker, and more particularly, to an electromagnetically driven slim speaker capable of reproducing delicate sound ranging from a low sound area to a high sound area, .

As is widely known, a speaker is a device for converting an input electrical signal into a sound signal, and has a structure capable of vibrating the diaphragm according to an electrical signal. The vibration power is given by the electromagnetic force, and the electric wire is constituted to generate sound by vibrating the diaphragm with the electromagnetic force, which is the force received by the magnetic field in which the magnetic force is completed.

These speakers include dynamic speakers, balanced armature speakers, flat dynamic speakers, and planar static speakers.

The dynamic speaker is a direct drive type using a voice coil, and the acoustic conversion is performed secondarily in a diaphragm receiving a vibration of a coil. As the coil and the diaphragm are mainly bonded by the adhesive, the vibration generated in the coil, in particular, the loss in the high frequency region necessarily occurs. Moreover, the efficiency of the coil is lowered due to the weight of the voice coil, which is a metal conductor, So that there is a limitation in delicate sound reproduction. On the other hand, large input is possible and amplitude displacement can be increased, and it is very useful for the low frequency, that is, the low frequency by the optimized equivalent mass and stiffness combination. The inner diameter of the voice coil and the diameter of the coil wire are increased when the voice coil is used for a low tone, and the coil wire of the smallest diameter is applied when the voice coil is used for a high tone. On the other hand, an ideal condition for a high tone is advantageous as the weight of the vibrating part is light.

A balanced amateur speaker has been developed and commercialized for delicate sound reproduction which is a constraint of a dynamic speaker, in which permanent magnets having different stimuli are disposed in each of the upper and lower portions, and one end of the armature is arranged between the permanent magnets The drive coil is wound in the middle of the armature, the iron core for vibration transmission is connected to one side of the armature by laser spotting, and the secondary vibration plate is bonded to the upper end of the vibration transmission iron core.

According to this configuration, one end of the armature vibrates (oscillates) between the permanent magnets due to the interaction with the permanent magnet depending on the direction of the current flowing into the drive coils, and this vibration is transmitted through the vibration- It is transmitted to the secondary diaphragm and the secondary diaphragm vibrates.

As described above, the balanced amateur speaker has a very good transient response of the amateur, so that the reproduced sound is very delicate, and in particular, it is easy to reproduce high quality sound close to the original signal in the middle / high range.

However, the balanced amateur speaker uses two oscillators such as an amateur and a secondary diaphragm, so that vibration is transmitted to the secondary diaphragm by a single point through the core for transmitting vibration. When the energy is large, And it is not only difficult to apply to a large area, but also has a disadvantage of causing sound loss.

In addition, since the spacing between the permanent magnets is about 0.15 mm, the balanced amateur loudspeaker has a drawback that it is very difficult to reproduce low-frequency sound and high-power reproduction.

And the biggest problem with balanced amateur loudspeakers is that the manufacturing process cost is too high and it takes 10 times more than a typical dynamic speaker. This is in balancing the amateur vibrating between the permanent magnets. For example, the spacing between the permanent magnets is about 0.15 mm. Even if the end of the armature is accurately positioned in the space between the permanent magnets, the end of the armature can be attached to the pole of the permanent magnet closer to the moment of magnetization In this case, when the end of the armature is attached to one of the permanent magnets in the magnetizing stage, since it is impossible to recover the original state, the workability is very weak and the production cost is very high. And it is applied only to a high-quality cannular earphone, and the application range thereof is extremely low.

The planar dynamic speaker has a structure in which a conductor on which a coil is etched is attached to a flexible diaphragm and the diaphragm interacts with the permanent magnets disposed on the upper and lower sides to vibrate the diaphragm itself. The manufacturing process is complicated and the manufacturing cost is excessively high, which is disadvantageous in that it can not be applied to a general speaker or an earphone.

The flat electrostatic speaker has a diaphragm as a single electrode, a fixed electrode is arranged on both sides of the diaphragm, a high voltage static electricity proportional to the acoustic signal is generated between the diaphragm and the fixed electrode, The sound quality level is the highest level in terms of the delicacy of reproduction sound and the imaging ability. However, since the manufacturing cost is too high and a high voltage of 100V or more is used, the human body contains dangerous elements, and it is not only susceptible to environmental factors (spark, power, humidity, etc.) but also mechanically unstable.

KR 10-2011-0063792 A (Jun 14, 2011) KR 10-1373427 B1 (2014.0.13)

The present invention overcomes several disadvantages of the prior art and overcomes the disadvantages of the prior art as well as integrates various advantages of the prior art. It can reproduce delicate sounds ranging from a low sound region to a high sound region, And it is an object of the present invention to provide an electromagnetically driven slim speaker capable of cost reduction.

According to an aspect of the present invention, there is provided an electromagnetically driven slim speaker,

Upper magnet;

A lower magnet disposed below the upper magnet;

A diaphragm in which at least a part is interposed between the upper magnet and the lower magnet; And

And an upper driving coil and a lower driving coil spaced apart from the upper and lower portions of the diaphragm,

The diaphragm has the same polarity as the lower end of the upper magnet and the upper end of the lower magnet so that the diaphragm is magnetically unipolar. .

The diaphragm is characterized in that the ferromagnetic material is made of a thin plate structure.

According to one embodiment, the diaphragm includes a vibrating portion provided at a central portion, a contact portion disposed outside the vibrating portion, and a braking portion connecting the vibrating portion and the contact portion and constituting a transmission path of a magnetic force.

Wherein the braking ribs are formed integrally with the braking ribs so as to connect the vibrating portion and the contact portion integrally, and the braking rib extends in the arc direction between the vibrating portion and the abutting portion.

An edge may be attached to an upper surface or a lower surface adjacent to the braking portion of the diaphragm.

Wherein the upper yoke and the lower yoke are disposed so as to be in contact with the upper magnet and the lower magnet so that the upper yoke and the lower yoke are magnetically polarized in polarity opposite to the diaphragm,

The upper driving coil is attached to the upper yoke and is spaced apart from the diaphragm, and the lower driving coil is attached to the lower yoke and is spaced apart from the diaphragm and fixed.

And the upper drive coil and the lower drive coil are connected such that their respective internal magnetic fluxes flow in the same direction.

Wherein the first yoke has a first protrusion protruding downward and an upper drive coil adjacent to the first protrusion; a second protrusion protruding upward in a central portion of the lower yoke; And the drive coils are attached adjacent to each other.

And a resonator block is attached to a central portion of the vibrating portion of the diaphragm.

And the outer edge of the upper yoke and the outer edge of the lower yoke are in contact with each other.

And the outer edge of the magnet and the yoke are spaced apart at intervals to minimize leakage of the magnetic field.

And the diaphragm has a structure in which the vibrating portion and the contact portion are mutually connected through the adhesive-type braking portion in a state that they are separated from each other.

And a hemispherical dome is formed in the vibrating portion of the diaphragm.

According to the present invention, an electromagnetic force is generated in accordance with the flow of current in a state in which the upper drive coil and the lower drive coil are fixed, and the electromagnetic force causes the diaphragm to move in the vertical direction between the upper drive coil and the lower drive coil, The vibration of the vibration plate of the diaphragm smoothly propagates smoothly between the upper drive coil and the lower drive coil so that there is almost no loss or reduction of the signal, and since the nonlinear distortion is prevented or minimized, It is possible to very accurately reproduce the delicate sound up to the area and to reproduce a clear sound without any distortion by making the linear vibration of the whole area by the vibration of the diaphragm itself and in particular, And the frequency characteristic It is possible to ensure high-quality sound through the balancing flattened.

According to the present invention, the diaphragm of a thin plate structure made of a ferromagnetic material vibrates in a state where the upper drive coil and the lower drive coil are fixed, thereby minimizing the effective mass and driving by the push- It is possible to effectively obtain high-efficiency sound reproduction, low-cost and high-performance, low-weight and eco-friendly characteristics, and can also be applied to various types of sound apparatuses such as earphone, headphone, and general audio.

According to the present invention, since the diaphragm smoothly transmits magnetic force from the magnets to the vibrating portion through the braking portion and effectively brakes the vibrating portion when the vibrating portion vibrates up and down, Path) can be stably implemented.

According to the present invention, there is an advantage that the braking of the vibration portion can be stably realized through the structure in which the braking rib extends in the arc direction.

According to the present invention, since the edge is provided adjacent to the braking portion, more improved braking performance can be realized.

According to the present invention, since the upper driving coil and the lower driving coil are individually attached to the upper yoke and the lower yoke, the upper and lower driving coils can stably maintain the upper and lower driving coils, respectively, There are advantages to be implemented.

According to the present invention, when the current is applied to the upper drive coil and the lower drive coil, the internal magnetic flux (internal magnetic field) flows in the same direction so that the electromagnetic force can be more effectively applied to the diaphragm, It is advantageous in that the overall vibration can be more smoothly performed.

According to the present invention, there is an advantage that the vibration performance of the vibration portion of the diaphragm can be enhanced as the magnetic flux concentrates in the portion where the first protrusion of the upper yoke and the second protrusion of the lower yoke are formed.

According to the present invention, resonator, vibration, and the like can be controlled more effectively by attaching the resonator block to the vibration portion of the diaphragm.

According to the present invention, since the mutually corresponding outer edges of the upper yoke and the lower yoke are in contact with each other, the entire magnetic circuit can be constituted by a closed circuit, whereby the magnetic field generated by the upper magnet and the lower magnet is concentrated inside, Can be minimized and higher conversion efficiency can be expected.

According to the present invention, since the outer edge of the magnet and the yoke are sufficiently separated from each other, leakage of the magnetic flux through the outer edge of the yokes can be prevented, so that the closed circuit can be stably realized.

According to the present invention, since the outer peripheral surface of the vibrating portion and the inner peripheral surface of the contact portion are separated at regular intervals, and the adhesive type braking portion is filled between the outer peripheral surface of the vibrating portion and the inner peripheral surface of the contact portion, The damping function can be smoothly performed. In particular, since the vibrating portion is spaced from the contact portion, it is possible to smoothly enlarge the vibration area, which is more effective for delicate sound reproduction.

According to the present invention, as the dome is formed in the vibration part, the vibration area of the vibration plate has an advantage that the vibration area can be further enlarged.

1 is a plan view showing an electromagnetically driven slim speaker according to a first embodiment of the present invention.
2 is a cross-sectional view taken along line AA in Fig.
3 is a bottom view of the electromagnetically driven slim speaker according to the first embodiment of the present invention.
4 is a plan view showing a diaphragm of an electromagnetically driven slim speaker according to a first embodiment of the present invention.
FIG. 5 is a view illustrating a driving principle of an electromagnetically driven slim speaker according to a first embodiment of the present invention.
6 is a cross-sectional view of an electromagnetically driven slim speaker according to a second embodiment of the present invention.
7 is a cross-sectional view of an electromagnetically driven slim speaker according to a third embodiment of the present invention.
8 is a cross-sectional view of an electromagnetically driven slim speaker according to a fourth embodiment of the present invention.
9 is a cross-sectional view of an electromagnetically driven slim speaker according to a fifth embodiment of the present invention.
10 is a cross-sectional view of an electromagnetically driven slim speaker according to a sixth embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of convenience, the size, line thickness, and the like of the components shown in the drawings referenced in the description of the present invention may be exaggerated somewhat. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

1 to 5 are views showing an electromagnetically driven slim speaker according to a first embodiment of the present invention.

1 to 5, an electromagnetically driven slim speaker according to the present invention includes an upper magnet 11, a lower magnet 12 disposed at a lower portion of the upper magnet 11, A diaphragm 20 of a magnetic material interposed between the upper and lower magnets 11 and 12 and an upper drive coil 31 disposed above the diaphragm 20 so as to be spaced apart from the upper portion, A lower yoke 42 arranged to be in contact with a lower end of the lower magnet 12 and a lower yoke 42 disposed to be in contact with a lower end of the lower magnet 12, .

1 and 2, the upper magnet 11, the lower magnet 12, the upper driving coil 31, and the lower driving coil 32 are installed in the frame 10, The upper magnet 11, the lower magnet 12, the upper driving coil 31, and the lower driving coil 32, and FIG. 1 illustrates a cylindrical structure.

3, an electrode member 50 having an electrode pattern 51 for supplying electric power to the upper driving coil 31 and the lower driving coil 32 is attached to the lower portion of the frame 10.

An upper yoke 41 and a lower yoke 42 are separately provided at upper and lower open ends of the frame 10, respectively.

The upper yoke 41 is made of a ferromagnetic material and has a polarity (S pole in FIG. 2) that is the same as that of the upper end of the upper magnet 11 as one of the upper yoke 41 contacts the upper end of the upper magnet 11 .

1, the upper yoke 41 has a first central through hole 41a formed at its center portion, and a plurality of first peripheral through holes 41b are formed around the first central through hole 41a have.

As shown in FIGS. 1 and 2, a guide groove 43 is formed at one side of the upper yoke 41, through which the coil lead 31a of the upper drive coil 31 passes and is guided. A guide groove 13 is also formed on one side of the frame 10 corresponding to the guide groove 43 of the upper yoke 41.

The lower yoke 42 is made of a ferromagnetic material and contacts the lower end of the lower magnet 12 at one side of the lower yoke 42 to have a polarity (S pole in FIG. 2) .

3, the lower yoke 42 has a second central through hole 42a formed at the center thereof and a plurality of second peripheral through holes 42b formed around the second central through hole 42a have.

2 and 3, a guide groove 44 is formed at one side of the lower yoke 42, through which the coil lead-out line 32a of the lower drive coil 32 passes and is guided. Acoustic discharge and air circulation can be performed very smoothly through the through holes 41a, 41b, 42a, and 42b of the upper yoke 41 and the lower yoke 42. [

The upper magnet 11 is located in the upper part of the inside of the frame 10 as shown in Fig. 2, and the upper end of the upper magnet 11 is in contact with one side of the upper yoke 41. And is spaced away from the first central through hole 41a of the upper yoke 41 in the radial direction.

The lower magnet 12 is located at the lower inner side of the frame 10 as shown in FIG. 2, and the lower end of the lower magnet 12 is in contact with the lower yoke 42. The lower magnet 12 is disposed to be spaced apart from the second central through hole 42a of the lower yoke 42 in the radial direction.

Particularly, the upper magnet 11 and the lower magnet 12 have the same height in the frame 10, and the lower end of the upper magnet 11 and the upper end of the lower magnet 12 are spaced apart from each other by a predetermined gap. At least a part (23) of the diaphragm (20) is interposed between the upper magnet (11) and the lower magnet (12).

The diaphragm 20 is made of a magnetic material so that magnetic force is smoothly transmitted. Particularly, the diaphragm 20 is made of a ferromagnetic material having a high magnetic permeability such as nickel, permalloy, etc. so that the upper magnet 11 and the lower magnet 12, So as to be unipolarized.

The diaphragm 20 can effectively perform up-and-down vibration by making the ferromagnetic material of the thin plate structure.

Alternatively, the diaphragm 20 may be formed of a film structure in which a magnetic material is coated on the surface through metallization, or a film structure in which a magnetic material is mixed.

At least a part 23 of the diaphragm 20 is brought into contact with and interposed between the upper magnet 11 and the lower magnet 12 and the lower end of the upper magnet 11 contacting the part 23 of the diaphragm 20 The upper ends of the lower magnets 12 have the same polarity so that the diaphragm 20 is magnetized monolithically to have the same polarity as the lower ends of the upper magnet 11 and the upper ends of the lower magnet 12 )do. In addition, the upper yoke 41 and the lower yoke 42 are magnetically monopolized (S pole in FIG. 2) so as to have the same polarity as the upper end of the upper magnet 11 and the lower end of the lower magnet 12. Since the diaphragm 20 and the yokes 41 and 42 are magnetically polarized in polarity, the diaphragm 20 and the yokes 41 and 42 are made of a ferromagnetic material and serve as a passage through which the magnetic force lines of the magnets 11 and 12 pass It is possible.

For example, as shown in Fig. 2, a portion 23 of the diaphragm 20 is simultaneously in contact with the lower end of the upper magnet 11 and the upper end of the lower magnet 12, and the lower end of the upper magnet 11 and the lower magnet 2), the diaphragm 20, which is a ferromagnetic substance, has the same polarity (N in FIG. 2) as the lower end of the upper magnet 11 and the upper end of the lower magnet 12, And each of the lower yoke 42 contacting with the lower end of the lower magnet 12 and the upper yoke 41 contacting with the upper end of the upper magnet 11 is fixed to the upper and lower magnets 11 12, which is a polarity corresponding to the lower end of the first and second polarizers. That is, the diaphragm 20 and the yokes 41 and 42, which are ferromagnetic materials, can be polarized so as to have polarities opposite to each other depending on a portion contacting the ends of the magnets 11 and 12, A magnetic circuit can be constructed very effectively between the upper surface and the upper yoke 41 and between the lower surface of the diaphragm 20 and the lower yoke 42.

On the other hand, when the lower end of the upper magnet 11 and the upper end of the lower magnet 12 are S-poles, the diaphragm 20, which is a ferromagnetic substance, And the lower yoke 42 contacting with the lower end of the lower magnet 12 is monopolarized to the N pole corresponding to the lower end of the lower magnet 12, do.

As described above, according to the present invention, the diaphragm 20 intervenes between and contacts the lower end of the upper magnet 11 and the upper end of the lower magnet 12, as well as between the upper magnet 11 and the lower magnet 12 The attractive force and the repulsive force of the magnets 11 and 12 generated in the diaphragm 20 from the upper yoke 41 and the lower yoke 42 are equivalently made to be equal to each other, The gap between the yoke 41 and the lower yoke 42 can be sufficiently secured and central balancing between the upper yoke 41 and the lower yoke 42 can be easily secured.

According to one embodiment, as shown in Figs. 4A and 4B, the diaphragm 20 includes a vibrating portion 21 provided at the center portion, a contact portion (not shown) disposed outside the vibrating portion 21 And a braking unit 25 that connects the vibrating unit 21 and the contact unit 23 and constitutes a transmission path of the magnetic force.

The vibrating unit 21 can vibrate in the vertical direction by alternately acting the suction force and the repulsive force in the vertical direction by the electromagnetic force generated as a current is applied to the upper drive coil 31 and the lower drive coil 32.

The contact portion 23 is a portion which is interposed between the upper magnet 11 and the lower magnet 12 to directly contact the lower end of the upper magnet 11 and the upper end of the lower magnet 12, The upper end of the lower magnet 12 is in contact with the lower end of the contact portion 23 and the upper magnet 11 and the lower magnet 12 are brought into contact with the upper face and the lower face of the contact portion 23, It can be firmly attached through an adhesive or the like.

The lower end of the upper magnet 11 and the upper end of the lower magnet 12 have the same polarity so that the contact portion 23 intervenes between the upper magnet 11 and the lower magnet 12, 20 may be monopolized with the same polarity as the lower end of the upper magnet 11 and the upper end of the lower magnet 12 as a whole.

4, the braking ribs 25a and 25b are composed of a plurality of braking ribs 25a and 25b integrally connecting the vibrating portion 21 and the contact portion 23, A part between the vibrating portion 21 and the contact portion 23 may be partially cut out to form the same body. In particular, the braking ribs 25a 25b extend in the arc direction between the vibrating portion 21 and the contact portion 23, whereby effective braking of the vibrating portion 21 can be achieved. The number of braking ribs 25a and 25b and the length of the braking ribs 25a and 25b may be variously changed depending on the application. For example, the braking rib 25a of FIG. 4 (a) And the number of the braking ribs 25a in FIG. 4 (a) is formed to be larger than the number of the braking ribs 25b in FIG. 4 (b).

As described above, the diaphragm 20 according to the present invention smoothly transmits magnetic force from the magnets 11 and 12 to the vibrating unit 21 through the braking unit 25, There is an advantage that a transmission path of the magnetic force, that is, a structure in which the magnetic path can be varied, can be stably realized.

On the other hand, an edge 26 may be attached to an upper surface or a lower surface of the diaphragm 20 adjacent to the bending portion 25. By this edge 26, more improved braking performance can be realized.

2, the upper driving coil 31 is attached to the upper yoke 41 to be spaced apart from the diaphragm 20 by an upper portion thereof. The upper end of the upper driving coil 31 and the upper surface of the diaphragm 20 are fixed 1 spacing R1. The diaphragm 20 can vibrate within a range between the upper magnet 11 and the lower magnet 12, that is, within the range of the first spacing R1 from the reference position R, so that the first spacing R1 ) Serves as an air gap.

The coil lead line 31a of the upper drive coil 31 is guided through the guide groove 43 of the upper yoke 41 and the guide groove 13 of the frame 10 and then the end thereof is guided by the electrode member 50 Of the electrode pattern 51 of the second electrode pattern.

2, the lower driving coil 32 is attached to the lower yoke 42 so as to be spaced apart from the vibration plate 20 and spaced apart from the vibration plate 20. The upper end of the lower driving coil 32 and the lower surface of the vibration plate 20 2 is sufficiently spaced by the spacing R2. Since the diaphragm 20 can vibrate within the range of the second spacing R2 starting from the position between the upper magnet 11 and the lower magnet 12, that is, the reference position R, (R2) serves as an air gap.

The coil lead wire 32a of the lower drive coil 32 is guided through the guide groove 13 of the lower yoke 42 as shown in Fig. 2 and then the end thereof is guided by the electrode pattern 51 of the electrode member 50, Respectively.

The upper drive coil 31 and the lower drive coil 32 are individually attached to the upper yoke 41 and the lower yoke 42 so that the state of being vertically spaced relative to the diaphragm 20 is stabilized Therefore, it is possible to more reliably realize the overall vibration of the diaphragm 20 through the diaphragm 20. The upper drive coil 31 and the lower drive coil 32 are separately attached to the upper yoke 41 and the lower yoke 42 so that the upper drive coil 31 and the lower drive coil 32 The layout layout can be implemented very stably and the whole vibration of the diaphragm 20 can be more smoothly performed.

The upper driving coil 31 and the lower driving coil 32 may be connected in series or in parallel and the inner magnetic flux of the upper driving coil 31 and the inner magnetic flux of the lower driving coil 32 may be in the same direction .

The upper drive coil 31 and the lower drive coil 32 have the same inner diameter d1 and an area corresponding to the inner diameter d1 of the drive coils 31 and 32 is connected to the vibrating portion 21 Is directly driven.

The operation principle of the electromagnetically driven slim speaker according to the present invention constructed as above will be described in detail with reference to FIG.

5, when a single magnetic pole of the diaphragm 20 is N-pole, a current is applied to the upper drive coil 31 and the lower drive coil 32 so that current flows out from the left side of the coils 31 and 32 The inner magnetic flux (internal magnetic field) of the upper drive coil 31 is lowered in a state in which the upper drive coil 31 and the lower drive coil 32 are fixed to the upper yoke 41 and the lower yoke 42, And the inner magnetic flux of the lower driving coil 32 are generated in the upper direction so that the vibrating portion 21 of the diaphragm 20 receives the repulsive force from the lower driving coil 32, 31, the vibrating portion 21 of the diaphragm 20 can be made to have a very stable overall vibration.

Thus, the vibration part 21 of the diaphragm 20 has a push-pull effect that simultaneously receives the repulsive force of the lower drive coil 32 and the suction force of the upper drive coil 31, Can be very high.

5, the vibrating portion 21 of the diaphragm 20 receives the repulsive force and the suction force in the opposite direction and vibrates in the opposite direction. As the flow of the current input to the upper drive coil 31 and the lower drive coil 32 is changed, the vibration portion 21 of the diaphragm 20 can be smoothly oscillated in the up and down direction.

The diaphragm 20 is arranged between the upper yoke 41 and the lower yoke 42 in a magnetically unipolar state with a polarity opposite to that of the yokes 41 and 42, And the upper driving coil 31 and the lower driving coil 32 are separated and fixed to the upper and lower portions of the diaphragm 20 so that the upper driving coil 31 and the lower driving coil 32 are separated from each other, An electromagnetic force is generated as the electric current flows in the diaphragm 20 and the diaphragm 20 vibrates in the vertical direction between the upper and lower drive coils 31 and 32 by alternately applying the attractive force and the repulsive force, 20 can smoothly advance the vibration of the whole area smoothly between the upper drive coil 31 and the lower drive coil 32. Thereby, there is almost no loss or reduction of the signal, and the source of nonlinear distortion Prevention or minimization of It is possible to reproduce delicate sound from the region to the high frequency region very effectively and to reproduce a clear sound without distortion by making the linear vibration of the whole area by the vibration of the diaphragm 20 itself, 21) can respond to a high-speed response at a high speed, so that high-resolution sound can be reproduced, and high-quality acoustic balancing can be ensured by flattening the frequency characteristics.

The diaphragm 20 having a thin plate structure made of a ferromagnetic material is vibrated in a state where the upper drive coil 31 and the lower drive coil 32 are fixed so that the effective mass is minimized and the push- It is possible to effectively obtain a high-efficiency sound reproduction, a low cost, a high performance, a low weight and an environmentally friendly characteristic, and is also applicable to a sound device of various items such as an earphone, a headphone, and a general audio .

6 is a view showing an electromagnetically driven slim speaker according to a second embodiment of the present invention.

According to the second embodiment of the present invention, the first projecting portion 45 is downwardly protruded at a portion adjacent to the first central through hole 41a of the upper yoke 41, and the upper drive coil 31 may be attached adjacent to each other.

A second protrusion 46 protrudes upward and a lower drive coil 32 is attached to the second protrusion 46 adjacent to the second central through hole 42a of the lower yoke 42. [

The vibration performance of the vibrating plate 20 with respect to the vibrating portion 21 is increased as the magnetic flux concentrates at the portion where the first projecting portion 45 of the upper yoke 41 and the second projecting portion 46 of the lower yoke 42 are formed There is an advantage to increase.

A resonator block 28 can be attached to the center of the vibrating portion 21 of the diaphragm 20 and resonance or vibration can be more effectively controlled by the resonator block 28. [

The rest of the configuration is the same as or similar to that of the preceding first embodiment, and a detailed description thereof will be omitted.

7 is a view showing an electromagnetically driven slim speaker according to a third embodiment of the present invention.

According to the third embodiment of the present invention, the outer edge of the upper yoke 41 and the outer edge of the lower yoke 42 are configured to contact each other. Specifically, a first contact portion 41d protruding downward is formed on the outer edge of the upper yoke 41, and a second contact portion 42d protruding upward is formed on the outer edge of the lower yoke 42 The first contact portion 41d of the upper yoke 41 and the second contact portion 42d of the lower yoke 42 are brought into contact with each other so that the entire magnetic circuit can be constituted by a closed circuit, And the magnetic flux generated by the lower magnet 12 is concentrated in the inside, and the leakage magnetic flux is minimized, so that a higher conversion efficiency can be expected.

The contact portions 41d and 42d of the magnets 11 and 12 and the yokes 41 and 42 are spaced apart by a distance t corresponding to the height h of the magnets 11 and 12, 41, and 42, it is possible to prevent the magnetic flux from leaking through the outer edges of the magnetic shields 41 and 42, thereby realizing a closed circuit more stably.

7, the frame may be omitted since the magnets 11, 12 and the diaphragm 20 can be sufficiently housed by the upper yoke 41 and the lower yoke 42. [

The rest of the configuration is the same as or similar to that of the preceding first embodiment, and a detailed description thereof will be omitted.

8 is a view showing an electromagnetically driven slim speaker according to a fourth embodiment of the present invention.

As shown in the figure, according to the fourth embodiment of the present invention, the diaphragm 20 includes an adhesive-type bending portion 27 such as silicone, rubber-based adhesive or the like in a state where the vibration portion 21 and the contact portion 23 are separated from each other, Or the like. The outer circumferential surface of the vibrating portion 21 and the inner circumferential surface of the abutting portion 23 are separated from each other by a constant distance k as shown in Fig. An adhesive type braking section 27 is filled. The vibration portion 21 and the contact portion 23 are connected to each other through the adhesive type braking portion 27 so that the magnetic force is smoothly transmitted and the vibration damping function can be smoothly performed. The vibration area can be expanded smoothly as the vibrating portion 21 is spaced from the contact portion 23, which is more effective for delicate sound reproduction.

The rest of the configuration is the same as or similar to that of the preceding first embodiment, and a detailed description thereof will be omitted.

9 is a view showing an electromagnetically driven slim speaker according to a fifth embodiment of the present invention.

According to the fifth embodiment of the present invention, a hemispherical dome 21a can be formed in the vibration section 21 of the diaphragm 20, and the vibration area can be further enlarged by the dome 21a . An edge 26 may be formed between the vibrating portion 21 and the contact portion 23 by injection molding or the like and the bending portion may be omitted.

The rest of the configuration is the same as or similar to that of the preceding first embodiment, and a detailed description thereof will be omitted.

10 is a view showing an electromagnetically driven slim speaker according to a sixth embodiment of the present invention.

According to the sixth embodiment of the present invention, a hemispherical dome 21a is formed in the vibrating portion 21 of the diaphragm 20, and a diving portion 25 is formed between the vibrating portion 21 and the abutting portion 23. [ And an edge 26 may be separately attached to an upper portion or a lower portion adjacent to the bending portion 25. [

The rest of the configuration is the same as or similar to that of the preceding first embodiment, and a detailed description thereof will be omitted.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: frame 11: upper magnet 12: lower magnet
20: diaphragm 21: vibrating portion 23: contact portion
25: Braking section 31: Upper drive coil 32: Lower drive coil
41: upper yoke 42: lower yoke

Claims (14)

Upper magnet;
A lower magnet disposed below the upper magnet;
A diaphragm made of a magnetic material at least partially interposed between the upper magnet and the lower magnet; And
And an upper driving coil and a lower driving coil spaced apart from the upper and lower portions of the diaphragm,
The diaphragm has the same polarity as the lower end of the upper magnet and the upper end of the lower magnet so that the diaphragm is magnetically unipolar. And an electromagnetically driven slim speaker. The method according to claim 1,
Wherein the diaphragm has a thin plate structure of a ferromagnetic material. The method according to claim 1,
Wherein the diaphragm includes a vibrating portion provided at a center portion, a contact portion disposed on an outer side of the vibrating portion, and a braking portion connecting the vibrating portion and the contact portion and constituting a transmission path of a magnetic force. The method of claim 3,
Wherein the braking portion is formed with a plurality of braking ribs for integrally connecting the vibrating portion and the contact portion, and the braking rib extends in a circular arc direction between the vibrating portion and the contact portion. The method of claim 3,
And an edge is attached to an upper surface or a lower surface adjacent to the braking portion of the diaphragm. The method according to claim 1,
Wherein the upper yoke and the lower yoke are disposed so as to be in contact with the upper magnet and the lower magnet so that the upper yoke and the lower yoke are magnetically polarized in polarity opposite to the diaphragm,
Wherein the upper driving coil is attached to the upper yoke and is spaced apart and fixed to the diaphragm, and the lower driving coil is attached to the lower yoke and is spaced apart from the diaphragm to be spaced apart from the lower driving coil. speaker. The method according to claim 1,
Wherein the upper drive coil and the lower drive coil are connected such that their respective internal magnetic fluxes flow in the same direction with respect to each other. The method of claim 6,
Wherein the first yoke has a first protrusion protruding downward and an upper drive coil adjacent to the first protrusion; a second protrusion protruding upward in a central portion of the lower yoke; And the drive coils are attached adjacent to each other. The method according to claim 1,
And a resonator block is attached to a central portion of the vibrating portion of the diaphragm. The method of claim 6,
Wherein an outer edge of the upper yoke and an outer edge of the lower yoke are in contact with each other. delete The method of claim 3,
Wherein the diaphragm has a structure in which the vibrating portion and the contact portion are mutually connected via the adhesive-type braking portion in a state where the vibrating portion and the contact portion are separated from each other. The method according to claim 1,
And a hemispherical dome is formed on the vibrating portion of the diaphragm. The method according to claim 1,
Wherein the diaphragm comprises a film structure in which a magnetic material is coated or a film structure in which a magnetic material is mixed.

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