KR101420320B1 - Ultra Slim diaphragm driving Speaker - Google Patents

Abstract

Suggested is an ultra slim diaphragm driving speaker. The ultra slim diaphragm driving speaker according to one embodiment of the present technology includes a top housing, a bottom housing which is formed to be connected to the top housing, a top permanent magnet which has a planar shape and is connected to the inner side of the top housing, a bottom housing which has the same shape as the top permanent magnet and is connected to the inner side of the bottom housing to face the top permanent magnet, a voice coil which surrounds the outside of a space formed by the top permanent magnet and the bottom permanent magnet and is fixed between the top housing and the bottom housing, and a metal diaphragm which is arranged between the top permanent magnet and the bottom permanent magnet and has a planar shape.

Description

[0001] The present invention relates to an ultra slim diaphragm driving speaker,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an acoustic transducer, and more particularly, to an ultrathin diaphragm front drive speaker.

Speakers are electro-acoustic transducers that convert electrical signals into sound signals to be heard by human ears. They can be classified into various types according to the type of diaphragm, the driving method, and the reproducible frequency band.

A representative example of the speaker is a moving coil speaker for vibrating the air by moving the coil attached to the diaphragm. Fig. 1 is a structural diagram of a general moving coil speaker.

The moving coil speaker shown in Fig. 1 is constituted by a ring-shaped permanent magnet 101 and an upper plate 103 and a lower plate 105 are provided on the upper and lower sides of the permanent magnet 101, Together with the permanent magnet magnetic circuit. A voice coil 109 is provided in a gap formed between the pole piece 107 and the upper plate 103 and a damper 111 is used for restoring and supporting the voice coil 109 in a circular state.

The diaphragm 113 is attached to the voice coil 109 and the diaphragm 113 is supported once again by the surround 115 on the speaker frame 119 in order to widen the vibration area to increase the sound output.

The moving coil speaker is configured such that current is supplied to the voice coil 109 installed in a narrow gap between the permanent magnets 101 constituted by N poles and S poles so that the direct current magnetic flux 102 of the permanent magnet 101, 109 and the AC magnetic flux 110 proportional to the length of the voice coil 109 move the voice coil 109 up and down. The kinetic energy is transmitted to the diaphragm 113 to vibrate the air on the diaphragm 113 to generate sound.

Thus, since the moving coil speaker has a structure in which the voice coil 109 and the vibration plate 113 move together, the weight of the vibration system increases, so that the sound reproduction in the high frequency band is restricted and the overall sound output efficiency of the speaker is deteriorated.

In addition, the divided vibration phenomenon in which the diaphragm portion joined to the voice coil 109 and the diaphragm portion not bonded to the voice coil 109 in the high frequency band are differently vibrated differently, and the sound quality is lowered and the acoustic output is reduced.

In order to apply a current to the voice coil 109, the coil joint portion 121 is connected to the gold wire 123 from the terminal 125. As the vibration plate 113 is repeatedly moved up and down, There is a risk of generating a disconnection of the gold cheek wire 123 and generating noise that the gold cheek wire 123 hits the diaphragm 113 and the asymmetry of the diaphragm 113 due to the coil bonding portion 121 is increased, The time division vibration phenomenon is intensified.

Since the entire thickness of the speaker is larger than the thickness of the permanent magnet 101, the thickness of the upper plate 103, the thickness of the lower plate 105, and the height of the diaphragm 113, as the diaphragm 113 is located above the permanent magnet 101, So that it is impossible to make it very thin.

In order to overcome such a problem, studies have been made to reduce the weight of a vibration system. Balanced amateur speakers are one example of speakers that solve such problems.

2 is a structural diagram of a general balanced amateur speaker.

2, the balanced amateur speaker includes a permanent magnet 201 attached to a yoke 204, and a vibrator 202 disposed between an N pole and an S pole of the permanent magnet 201 to constitute a driving unit . When the coil 203 is wound around the oscillator 202 at a predetermined interval by a vertical vibration width of the oscillator 202 and an alternating current is passed therethrough, the oscillator 202 is changed to the N pole or the S pole according to the direction of the current by the principle of the electromagnet, An attractive force or a repulsive force is generated according to the polarity of the permanent magnet 202 and the permanent magnet 201, and the vibrator 202 vibrates up and down. The up-and-down kinetic energy of the vibrator 202 is transmitted to the diaphragm 206 through the connecting rod 205, so that the diaphragm 206 can move and reproduce the electric signal by sound.

Balanced amateur speakers have the advantage of lowering the vibration system by separating the coil and diaphragm, so that the sound output efficiency is higher than that of the moving coil type. However, since the connecting rod 205 is used to transmit the vibration of the vibrator 202 to the diaphragm 206, a force is concentratedly applied to only one point of the diaphragm (i.e., a portion where the connecting rod 205 is contacted) It is difficult to move in the same phase in the vertical direction. Therefore, in the balanced amateur speaker system in which one point is concentratedly driven, the divided vibration phenomenon occurs because the vibration plate 206 does not move in the same phase as the size of the vibration plate 206 becomes larger, and the acoustic characteristics deteriorate.

On the other hand, the principle of oscillation of a moving coil speaker, that is, when a current flows in a magnetic line, a principle is used in which the wire moves in a vertical direction by force, but the arrangement of the permanent magnet and the wire is made different from that of an existing moving coil, Made flat-plate magnetic speaker.

3 is a structural view of a flat magnet magnet speaker.

The planar magnet speaker shown in Fig. 3 includes a plurality of permanent magnets 301 polarized in the vertical direction and having N poles and S poles alternately arranged, a diaphragm 302 provided between the upper and lower permanent magnets 301, And a thin film conductor 303 bonded on the diaphragm 302.

A current is applied to the thin film conductor 303 bonded to the diaphragm 302 on the line of magnetic force formed by the permanent magnet 301 as shown in Fig. 3 to generate a force to move the conductor, and this force acts on the diaphragm 302 Move it up and down. When the diaphragm 302 is moved in this manner, the entire diaphragm moves up and down at a time, so that the divided vibration, which is a problem in the moving coil speaker and the balanced amateur speaker, can be solved.

However, in order to increase the acoustic output, the length of the thin film conductor 303 bonded on the diaphragm 302 must be made longer by the coil length of the moving coil speaker. However, the thin film conductor 303 must be attached to the diaphragm 302 in the form of a pattern It is difficult to ensure the same coil length as that of the moving coil speaker, which results in a problem that the energy conversion efficiency is lowered.

A large number of permanent magnets 301 must be introduced in order to solve the problem of lowering the acoustic output due to the reduction of the length of the thin film conductor 303, which causes a problem of greatly increasing the manufacturing cost.

In addition, at high frequencies with a short wavelength, the thin film conductor 303 pattern printed on the diaphragm makes it impossible to uniformly distribute the force to the entire diaphragm 302, causing a problem of causing phase interference for each diaphragm portion. When the thin film conductor 303 used as the voice coil is coated on the diaphragm 302 and the current is increased in the thin film conductor 303 at the time of high output to generate high heat, the attached thin film conductor 303 is applied to the diaphragm 302 So that durability can not be guaranteed.

In recent years, the thickness of various multimedia devices such as a TV receiver has been decreasing day by day. In the case of a TV receiver using an organic light emitting device, the thickness is reduced to 5 mm or less. Accordingly, there is a demand for a speaker capable of outputting a sound signal of a desired frequency band while being ultra-thin enough to be applied to such a multimedia device.

An embodiment of the present invention provides an ultrathin diaphragm front drive speaker in which a driver is disposed on a vibration side.

Another embodiment of the present invention provides an ultrathin diaphragm front drive speaker capable of uniformly driving the entire vibration surface to suppress split vibrations.

Another embodiment of the present invention provides an ultrathin diaphragm front drive speaker capable of minimizing the weight of the driver and vibration.

According to an embodiment of the present invention, an ultrathin diaphragm front drive speaker includes an upper housing; A lower housing formed to be interlocked with the upper housing; An upper permanent magnet which is flat and fastened to the inner surface of the upper lower housing; A lower permanent magnet having the same shape as the upper permanent magnet and fastened to the inner surface of the lower housing so as to face the upper permanent magnet; A voice coil formed to surround the outer circumference of the space formed by the upper permanent magnet and the lower permanent magnet, and fixed between the upper housing and the lower housing; And a metal diaphragm disposed between the upper permanent magnet and the lower permanent magnet and having a flat plate shape.

According to this technique, the speaker can be made ultra-thin by disposing the driving portion on the side surface of the vibration portion.

In addition, since the vibration and the AC magnetic flux are uniformly distributed on the entire surface of the vibration part, the divided vibration can be suppressed as the vibration part is uniformly driven, and the voice coil can be separated from the vibration plate to reduce the weight of the vibration part. It is possible to increase the sound output efficiency as well as the possibility.

In addition, since the voice coil is attached to the metal housing, the external power output of the voice coil can be increased to enhance the cooling efficiency of the voice coil, and since the terminal implemented in the metal housing is directly connected to the coil, It is possible to omit the gold line for connection, thereby increasing the durability.

1 is a structural view of a general moving coil speaker,
2 is a structural view of a general balanced amateur speaker,
3 is a structural view of a planar magnet speaker,
FIG. 4 is an exploded perspective view of an ultrathin diaphragm front drive speaker according to an embodiment of the present invention, FIG.
5A and 5B are an assembly sectional view and a vibration floor plan view of an ultrathin diaphragm front drive speaker according to an embodiment of the present invention,
6A and 6B are an assembly sectional view and a vibration floor plan view of an ultrathin diaphragm front drive speaker according to another embodiment of the present invention,
7A and 7B are an assembled cross-sectional view and a vibration floor plan view of an ultrathin diaphragm front drive speaker according to another embodiment of the present invention,
FIG. 8 is an assembly sectional view of an ultrathin diaphragm front drive speaker according to another embodiment of the present invention, FIG.
FIGS. 9A and 9B are views for explaining a magnetic flux loop of an ultrathin diaphragm front drive speaker according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described more specifically with reference to the accompanying drawings.

4 is an exploded perspective view of an ultrathin diaphragm front drive speaker according to an embodiment of the present invention.

Referring to FIG. 4, the ultra slim vibration plate front driving speaker 40 according to an embodiment of the present invention includes an upper housing 401a and a lower housing 401b formed to be mutually engaged, an upper permanent body 401a fastened to the upper housing 401a, A pair of permanent magnets 403a and 403b and a pair of permanent magnets 403a and 403b for forming a direct current magnetic flux including a lower permanent magnet 403b fastened to the lower housing 401b and a magnet 403a, A voice coil 405 formed between the upper housing 401a and the lower housing 401b and fixed to the outer housing 401 to form an AC flux and a pair of permanent magnets 403a and 403b And a metal diaphragm 407 vibrating in an up-and-down direction through the interaction of the direct-current magnetic flux formed by the permanent magnets 403a and 403b and the magnetic flux formed by the voice coil 405. [

More specifically, the housings 401a and 401b are made of a conductive material such as metal, and are made of magnetic materials, such as a magnetic material for focusing the DC magnetic flux by the permanent magnets 403a and 403b and the AC magnetic flux by the voice coil 405 to the metal diaphragm 407 Constitute a circuit loop. In addition, acoustic emission holes 4011 and 4013 are provided in the housings 401a and 401b to radiate air from the front surface of the metal diaphragm 407 to the outside. In one embodiment of the present invention, the housings 401a and 401b may have a substantially disc shape in plan view, but are not limited thereto.

The pair of permanent magnets 403a and 403b are each formed in a substantially flat plate shape and form a DC magnetic flux loop together with the metal housing 401a and 401b. That is, the DC magnetic flux generated from the upper permanent magnet 403a flows into the lower permanent magnet 403b through the metal diaphragm 407, and the DC magnetic flux flowing into the lower permanent magnet 403b flows into the metal housing 401b - > 401a and is collected again in the upper permanent magnet 403a. Thereby minimizing the leakage magnetic flux and maximizing the focusing of the direct current magnetic flux to the metal diaphragm 407.

The voice coil 405 forms an alternating magnetic flux loop together with the metal housing 401a, 401b. That is, the AC magnetic flux generated in the voice coil 405 flows into the metal housing 401a having a low magnetic resistance (for example, 401a) and flows into the metal housing (for example, 401b) through the metal diaphragm 407. This minimizes the leakage magnetic flux and maximizes the convergence of the AC magnetic flux to the metal diaphragm 407.

Therefore, when the alternating current is applied to the voice coil 405 through the terminal 413 provided in the lower housing 401b, the ultrasonic vibrating plate front driving speaker 40 according to the present embodiment can move the metal diaphragm 407 Are magnetized to the N pole or S pole and the metal diaphragm 407 oscillates in the upward and downward directions by the attractive force and the repulsive force with the permanent magnets 403a and 403b arranged above and below the metal diaphragm 407. [

The metal diaphragm 407 is preferably formed in a substantially flat plate shape using a material having a high magnetic permeability.

On the other hand, when there is no AC magnetic flux on one side of the metal diaphragm 407, the metal diaphragm 407 is returned to its original position, and the air flow on the front and rear surfaces of the metal diaphragm 407 is cut off to form only the acoustic emission holes 4011 and 4013 A surround 409 for allowing the sound to be emitted can be disposed. In the embodiment of the present invention, when the metal diaphragm 407 is made of a material having elasticity, the surround 409 may be omitted, and the metal diaphragm 407 itself or the metal diaphragm 407, (409) together can also be referred to as a vibrating portion.

The vibrating portion 407/409 or 407 can be fixedly installed at a designated position between the pair of permanent magnets 403a and 403b by the pair of supports 411a and 411b. 4, the pair of support rods 411a and 411b are formed so that the edges of the vibrating portion 407/409 or 407 are fixed to the corresponding surfaces of the vibrating portion 407/409 or 407, And can have a ring shape having an opening having substantially the same shape as the shape.

5A and 5B are an assembled cross-sectional view and a vibration floor plan view of the ultrathin diaphragm front drive speaker according to an embodiment of the present invention.

Fig. 5A is an assembled cross-sectional view of the ultrathin diaphragm front drive speaker shown in Fig. 4, and Fig. 5B is a plan view of the vibration units 407 and 409. Fig.

The surround 409 is disposed on one surface of the metal diaphragm 407 and the metal diaphragm 407 and the surround 409 are supported by a pair of supports 411a and 411b to form a pair of permanent magnets 403a , And 403b.

The edge portion of the metal diaphragm 407 is formed to have a plurality of holes 4071 of a specified shape and a surround 409 of the same size is provided on the metal diaphragm 407 of this shape.

The displacement of the metal diaphragm 407 is ensured by the plurality of holes 4071 and the restoring force due to the elasticity of the plurality of holes 4071 and the surround 409 in a state in which no current is applied to the voice coil 405 The metal diaphragm 407 can be returned to its original position. The plurality of holes 4071 can be manufactured in various shapes and sizes according to the maximum displacement of the metal diaphragm 407 and the reproduction frequency band.

6A and 6B are an assembly sectional view and a vibration section plan view of an ultrathin vibration plate front drive speaker according to another embodiment of the present invention, in which FIG. 6A is an assembled sectional view and FIG. 6B is a plan view of a vibrating part.

This embodiment shows a vibrating portion in which a pleated surround 4091 is provided on the outer periphery of the metal diaphragm 407. As the corrugated surround 4091 is introduced, the restoring force of the metal diaphragm 407 can be increased.

7A and 7B are an assembled cross-sectional view and a plan view of a vibrating part of the ultrathin diaphragm front drive speaker according to another embodiment of the present invention.

When the metal diaphragm 407 is formed of a high permeability material having elasticity, the vibration portion can be formed without a separate surround. That is, since the restoring force of the metal diaphragm 407 can be corrected by the elasticity of the metal diaphragm 407 itself, the introduction of surround becomes unnecessary.

8 is an assembled sectional view of an ultrathin diaphragm front drive speaker according to another embodiment of the present invention.

The present embodiment shows a structure in which the voice coil 405 is divided into upper and lower portions of the vibrating portions 407 and 409.

That is, since the voice coil 405 is disposed on the outer periphery of the vibrating portion of the speaker shown in Figs. 5 to 7, the overall diameter has a size including the circumference length of the voice coil to the diameter of the vibrating portion.

However, if the voice coil 405 is divided into the upper coil 405a and the lower coil 405b and disposed at the upper and lower portions of the vibrating portion as shown in FIG. 8, a further miniaturized speaker having a length corresponding to the diameter of the vibrating portion can do.

At this time, the spacing between the upper and lower coils 405a and 405b can be determined in consideration of the maximum displacement of the vibrating portion.

In addition, FIG. 8 shows a structure in which the vibrating part is composed of the metal diaphragm 407 and the surround 409 as shown in FIG. 5, but the present invention is not limited thereto. The structure may include a corrugated surround structure as shown in FIG. 6, It is of course possible to adopt a metal diaphragm structure of an elastic material omitting the surround.

FIGS. 9A and 9B are views for explaining a magnetic flux loop of an ultrathin diaphragm front drive speaker according to an embodiment of the present invention.

First, the formation and operation of the DC magnetic flux loop will be described with reference to FIG.

The direct current magnetic flux generated in the upper permanent magnet 403a flows into the lower permanent magnet 403b through the lower metal diaphragm 407. [ The DC magnetic flux flowing into the lower permanent magnet 403b flows back to the upper permanent magnet 403a via the metal housing 401b to 401a having a small magnetic resistance to form a DC magnetic flux loop.

Next, the formation and operation of the alternating magnetic flux loop will be described with reference to FIG. 9B.

As the alternating current is applied through the terminal 413, the alternating magnetic flux generated in the voice coil 405 flows into the metal housing with low magnetic resistance (for example, 401a). And then flows through a metal diaphragm 407 formed between the housings 401a to flow into a metal housing having a low magnetic resistance (for example, 401b) to form an alternating magnetic flux loop.

As a result, depending on the direction of the current applied to the voice coil 405, the metal diaphragm 407 is magnetized to the N pole or S pole and the attraction force with the permanent magnets 403a and 403b arranged above and below the metal diaphragm 407 , The metal diaphragm 407 is vibrated up and down by the repulsive force so that the sound can be radiated to the outside.

In addition, magnetic circuit closed loops are formed through the metal housings 401a and 401b to minimize the leakage magnetic flux and to maximize the focusing of the direct current magnetic flux to the metal diaphragm 407.

However, in the present invention, the voice coil 405 is disposed on the side surface of the vibrating part so that the total thickness of the speaker is set to the maximum value of the diaphragm Displacement and the thickness of the metal housing (for example, 4 mm or less).

In the moving coil type speaker, the voice coil transmits the driving force only to a part of the diaphragm, so that divided vibration occurs at the diaphragm in the portion not in contact with the diaphragm in the portion contacting with the voice coil during high frequency reproduction, . On the other hand, in the present invention, since the DC and AC magnetic fluxes are uniformly distributed over the metal diaphragm 407, a uniform driving force is applied to the entire surface of the metal diaphragm 407, so that the high frequency band is enlarged and the sound output efficiency can be increased.

In the moving coil type speaker, the voice coil and the diaphragm vibrate together to reduce the sound output efficiency due to the increase in the weight of the vibration part. However, in the present invention, the voice coil 405, which occupies a large part of the weight of the vibration part, 401b, and only the metal diaphragm 407 vibrates, so that the acoustic output efficiency can be improved. For example, the weight of the vibrating portion can be reduced to less than half as compared with a moving coil type speaker.

 In the moving coil type speaker, there is a problem that the voice coil is located in a narrow space between the magnetic gaps so that heat emission generated from the voice coil is limited and the allowable input is limited. In the present invention, Since the side portions are in contact with the metal housings 401a and 401b, efficient heat emission is enabled, and the cooling efficiency is increased as compared with the moving coil type speaker, so that durability due to a large input current can be improved.

Furthermore, in a moving coil type speaker, a gold line connected to a terminal for applying current to a voice coil is connected to a coil connection portion of a diaphragm, so that when the diaphragm moves up and down, a coil connection weakens and a disconnection occurs. And the vertical movement of the diaphragm due to the coil joint is not smooth, thereby causing a problem of increasing the divided vibration. In contrast, in the present invention, since the voice coil 405 is fixed without moving, there is no fear of disconnection of the voice coil 405, there is no occurrence of contact noise with the diaphragm because there is no diagonal line structure, and there is no coil joint. The vibration is smooth and high quality sound reproduction without divided vibration is possible. This structural simplicity makes it easier to mass-produce automation, which is difficult in the moving coil system, and can significantly reduce the manufacturing defects.

Therefore, the present invention can be applied to speakers of various sizes of electronic products such as ultra-thin TVs and portable multimedia devices requiring high sound quality.

Thus, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

401a, 401b: housing
403a, 403b: permanent magnet
405: Voice coil
407: metal diaphragm
409: Surround
411a and 411b:
413: Terminal
4011, 4013: acoustic radiation hole

Claims (6)

An upper housing;
A lower housing formed to be interlocked with the upper housing;
An upper permanent magnet which is flat and fastened to the inner surface of the upper lower housing;
A lower permanent magnet having the same shape as the upper permanent magnet and fastened to the inner surface of the lower housing so as to face the upper permanent magnet;
A voice coil formed to surround the outer circumference of the space formed by the upper permanent magnet and the lower permanent magnet, and fixed between the upper housing and the lower housing; And
A metal diaphragm disposed between the upper permanent magnet and the lower permanent magnet and having a flat plate shape;
And an ultra slim diaphragm front drive speaker. The method according to claim 1,
Wherein the upper housing and the lower housing are made of a conductive material. The method according to claim 1,
And a surround disposed on one surface of the metal diaphragm. The method according to claim 1,
And a corrugated surround fixed to the outer periphery of the metal diaphragm. The method according to claim 1,
The metal diaphragm is made of an elastic material,
Further comprising a support fixedly installed between the upper permanent magnet and the lower permanent magnet and made of an elastic material and having an opening substantially the same as that of the metal diaphragm. The method according to claim 1,
An upper voice coil formed in the upper region of the metal diaphragm; And
And a lower voice coil formed in a lower region of the metal diaphragm,
Wherein the upper voice coil and the lower voice coil are spaced apart from each other based on a maximum displacement in the vertical direction of the metal diaphragm.

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