KR20050122656A - Flatplate speaker for improving sound pressure - Google Patents

Abstract

The present invention provides a flat speaker that can reinforce sound pressure by generating a magnetic field through a magnetic body attached to a flat diaphragm, and a yoke for fixing a plurality of components necessary for sound reproduction is provided, and is provided inside the yoke. The first and second magnetic bodies are disposed to be spaced apart from each other, and a flat diaphragm is disposed to vibrate naturally and vertically at a position spaced apart from the first and second magnetic bodies so as to vibrate naturally. A circuit is formed, and the third and fourth magnetic bodies are positioned at symmetrical positions on both the right and left sides of the flat diaphragm.

Description

Flat speaker for improving sound pressure

The present invention relates to a speaker having a flat diaphragm, and more particularly to a flat speaker capable of reinforcing sound pressure by generating a magnetic field through a magnetic body attached on the flat diaphragm.

In general, the bass speaker has a cone-shaped diaphragm, and the cone-shaped diaphragm of the bass speaker undesired split vibration appears when the frequency increases when radiating sound waves. The split vibration occurs differently in the mid and high frequencies of the frequency. First, the split vibration occurs in the mid range due to the resonance of the edge part around the cone. When the frequency gets higher and reaches the high range, resonance of the connector occurs, and sound waves do not occur above the frequency at which the resonance of the connector occurs.

The high limit is determined by the inherent resonant frequency of the loudspeaker unit, and the high limit is determined by several factors such as the size of the loudspeaker unit, the moving part effective mass, and the stiffness.

While reproducing the entire audio frequency band with a single speaker is a desired characteristic of the speaker, the characteristics of the cone-shaped speaker are due to the split vibration, which results in deterioration of sound quality and limitation of high range, and smoothness of sound due to this degradation and high range limitation. In order to solve the problem that radiation is not made, the band is divided into low and high sounds by different speaker sizes, and a combination of the speakers for each band is solved.

However, the speaker configured as described above increases the installation space, thereby increasing the cabinet in which the speaker is built, thereby causing a problem in that the speaker system also increases the installation space.

In order to solve such a problem, Korean Patent Application No. 1999-0049580 proposed a speaker having a flat diaphragm without sound distortion because it overcomes the nonlinear deformation while overcoming the split vibration present in the speaker during sound emission.

A speaker having a conventional diaphragm proposed by the patent application will be described with reference to FIGS. 1 to 7.

1 is a schematic cross-sectional view of a conventional speaker system.

Referring to FIG. 1, the flat diaphragm 10 is fixed with an adhesive perpendicular to the flat voice coil plate 16, and the upper plates 11a, 11b, 11c, 11d, 12a, 12b, 12c, 12d and the lower plate ( The assembly of permanent magnets fixed between 13a, 13b, 13c, 13d, 14a, 14b, 14c, and 14d is inserted and the assembly of the permanent magnet and the upper and lower plates is fixed to the base frame 15. Then, the edges 19 are bonded to each other at the edge of the flat diaphragm 10 and fixed by the guide ring.

The action of the above configuration is that the current generated in the speaker drive circuit is supplied to the voice coil 18 fixed to the voice coil plate 16 to form a magnetic field in the voice coil 18, and these magnetic fields face the permanent magnet plate. It interacts with the magnetic field emitted from the magnetic poles of the assembly of to generate a reaction torque force that vibrates the voice coil plate 16 and the flat diaphragm 10 secured thereto.

2 is a perspective view showing a bonding state of a conventional diaphragm and voice coil.

2 is a perspective view showing a bonded structure of the planar diaphragm 10 and the planar voice coil plate 16 of FIG. 1, illustrating components of the planar diaphragm 10 and the planar voice coil plate 16. The perspective view of 2 will be more fully understood and appreciated by those skilled in the art.

3 is a cross-sectional view of a voice coil attached to a conventional speaker.

FIG. 3 shows the configuration of the flat voice coil plate 16 and the voice coil 18 of FIG. 1. The structure of the voice coil and the voice coil plate thus constructed is uniformly molded into irregularities as shown in FIG. Sticks.

4 is an exploded perspective view illustrating in detail the introduction of the voice coil, the permanent magnet and the plate according to the conventional speaker principle.

FIG. 4 is an exploded perspective view of the structure of the structure bonded to the permanent magnet 17 and the plates 11, 12, 13, and 14 and the structure of the voice coil plate 16 and the voice coil 18. As shown in FIG. 4, the coupling between the voice coil plate 16 and the plate is the same as that of FIG. 5.

5 is a perspective view illustrating a retracted state of a permanent magnet, a plate assembly, and a voice coil according to a conventional speaker principle.

FIG. 5 is a perspective view of a state in which the exploded perspective view of FIG. 4 is combined, and shows a magnetic field polarity of the plate. The magnetic field polarity of the plate is composed of 11-S, 12-N, 13-N, and 14-S. Therefore, the polarities of the magnetic fields of the plates 11 and 12 facing each other on the upper side have opposite polarities. It is composed. The magnetic field of the plate configured at the lower side also has such a configuration, and the upper and lower magnetic fields also have opposite polarities.

6 is a perspective view showing the arrangement of the permanent magnet and the plate assembly according to the conventional speaker principle.

6 is an arrangement similar to that shown in FIGS. 4 and 5 described above, illustrating an arrangement pattern of a second preferred permanent magnet and plate assembly, wherein alternating plate pole pieces have poles a, c, e, g, b ', d', f ', h') and pole pieces b, d, f, h, a ', c', e ', g' having the north pole are illustrated.

Fig. 7 discloses a linear diagram of the configuration of the magnetic field and the configuration pattern of the voice coil.

FIG. 7A shows the magnetic field configuration of the upper plate and the configuration pattern of the voice coil, and FIG. 7B shows the magnetic field configuration of the lower plate and the configuration pattern of the voice coil. As shown in the figure, the pattern of the electric field generated in the voice coil and the magnetic field pattern of the plate are generated, and the driving force is generated equally in each part of the coil in a specific direction according to Fleming's left hand law.

However, in the case of a speaker having a conventional diaphragm having the structure as described above, the voice coil is configured in a plane on the diaphragm and a plurality of magnets are arranged in the lower part of the diaphragm to limit the sound field and have a small amplitude of the output sound. There was this.

The present invention has been made to solve the above problems, an object of the present invention is to provide a speaker having a flat diaphragm that can reinforce sound pressure by strengthening Lorentz force by a magnetic field generated from a magnetic body attached to the flat diaphragm. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a speaker having a flat diaphragm which can reduce the attenuation of the amplitude of the output sound by strengthening the Lorentz force by a magnetic field generated by a magnetic body attached to the flat diaphragm.

In order to achieve the above object, the present invention provides a yoke for fixing a plurality of components necessary for sound reproduction, a first and a second magnetic body are disposed to be spaced inside the yoke, and the first and second 2 is installed in the position spaced apart from the magnetic material by a natural vibration up and down, and the vibration is generated a plane diaphragm is disposed, the current circuit is formed on the plane diaphragm, the planar diaphragm in the symmetrical position on both sides And the third and fourth magnetic bodies are located.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

8 is a cross-sectional view of a flat speaker for sound pressure reinforcement according to an embodiment of the present invention.

Referring to FIG. 8, the flat panel speaker 100 of the present invention is provided with a yoke 110 for fixing a plurality of components required for sound reproduction, and is spaced apart from the inside of the yoke 110. And a second diaphragm 120 and 121 are disposed and installed to enable natural shaking up and down at positions spaced apart from the first and second magnetic bodies 120 and 121 by a predetermined distance so as to vibrate and generate sound while being vibrated. ) Is disposed, the current circuit 140 is formed on the flat diaphragm 130, the upper side of the yoke 110, the diaphragm 130 and the protective plate 150 for protecting the components disposed inside the yoke 110 Assembly is installed.

Further, in the present invention, the third to sixth magnetic bodies 160 to 163 are positioned at symmetrical positions on both sides of the flat diaphragm 130, and the third and fourth magnetic bodies 160 and 161 are disposed on the upper side of the flat diaphragm 130. The fifth and sixth magnetic bodies 162 and 163 are disposed below the planar diaphragm 130. Here, the third and fifth magnetic bodies 160 and 162 are symmetrically attached to the upper left and lower portions of the planar diaphragm 130, and the fourth and sixth magnetic bodies 161 and 163 are symmetrical to the upper and lower right sides of the planar diaphragm 130. Is attached.

In addition, in the flat panel speaker 100 of the present invention, the first and second plates 170 and 171 are stacked on the third and fourth magnetic bodies 160 and 161, respectively.

In FIG. 8, the first and second plates 170 and 171 are stacked on the third and fourth magnetic bodies 160 and 161, respectively, but are not limited thereto.

For example, the third and fourth magnetic bodies 160 and 161 may not be disposed on the upper left and right sides of the flat diaphragm 130, and instead, the first and second plates 170 and 171 may be directly disposed at the positions. There will be.

Although the current circuit 140 is illustrated as being formed only on the upper portion of the planar diaphragm 130 in the drawing, the present invention is not limited thereto. Rather, the current circuit 140 is symmetrically formed on upper and lower portions of the planar diaphragm 130.

The signal input to the current circuit 140 formed on the flat diaphragm 130 as described above is an electric signal of an AC type having sound information. The electric signal includes all information related to the sound, such as the volume and frequency of the sound. Included.

When an electric signal of an AC type is input to the current circuit 140, a series of magnetic fields are formed in the current circuit 140, and between the magnetic field and the magnetic fields generated by the magnetic bodies 120, 121, 160 to 163. Lorentz force is generated by the interaction, and the force causes the current circuit 140 and the diaphragm 130 to move in the vertical direction. The current circuit 140 and the plane diaphragm 130 are vibrated up and down to generate sound pressure. At this time, the direction of the current contributing to the generation of the Lorentz force is as shown in FIG.

However, although the current is shown in the right direction in FIG. 9, the current flow does not flow in a fixed direction. In other words, since the current applied to the current circuit 140 is an AC signal, the current direction flowing through the current circuit 140 is changed.

In the case of the planar diaphragm 130, since the left end is fixed by the third and fifth magnetic bodies 160 and 162 and the right end is fixed by the fourth and sixth magnetic bodies 161 and 163, the current circuit 140 ) And magnetic force (120, 121, 160 to 163) when the Lorentz force is generated is to vibrate up and down to generate sound pressure.

These diaphragms require the following characteristics to generate sound pressure while vibrating.

The first condition is required to have high elasticity. The high resonant frequency is proportional to the speed of sound, but since the speed of sound is determined by inelasticity, if the lowest resonant frequency is constant, the regeneration frequency band can be expanded as the inelasticity is high.

The second condition requires a large internal loss. The unevenness of the frequency characteristic graph is due to the sharpening of many resonances occurring in the vibrometer. Therefore, when the internal loss is large, it is possible to flatten the peak of resonance.

The third condition is required to be light. In order to obtain a larger sound pressure from an input signal of constant energy, the lighter the vibration system including the diaphragm, the better.

Thus, the diaphragm of the speaker is ideal if it has high inelasticity, high internal loss and light weight material. Therefore, finding a diaphragm material that suits all three of these conditions is the basis for making good sound speakers.

The first magnetic body 120 has an S pole on the top and an N pole on the bottom. The second magnetic body 121 has an S pole disposed below and an N pole located above. Therefore, the electric field generated by the N pole of the second magnetic body 121 is directed toward the S pole of the first magnetic body 120.

The third magnetic body 160 has an N pole on the left side and an S pole on the right side of the current circuit 140. The fourth magnetic body 161 has an S pole on the right side and an N pole on the left side of the current circuit 140. Therefore, the electric field generated from the N pole of the fourth magnetic body 161 is directed toward the S pole of the third magnetic body 160.

The fifth magnetic body 162 has an N pole on the left side and an S pole on the right side in the direction of the current circuit 140. The sixth magnetic material 163 has an S pole on the right side and an N pole on the left side in the direction of the current circuit 140. Therefore, the electric field generated from the N pole of the sixth magnetic body 163 is directed toward the S pole of the fourth magnetic body 160.

As described above, the present invention allows the magnetic bodies 120, 121, 160 to 163 to generate a plurality of magnetic fields in the same direction, thereby maximizing Lorentz force. Accordingly, the present invention maximizes the Lorentz force by the magnetic field strengthened than before, so that the sound pressure can be reinforced and the attenuation of the amplitude of the output sound is reduced.

In addition, in the flat panel speaker of the present invention, since the current circuit 140 and the magnetic bodies 120 and 121 are positioned in parallel with the diaphragm 130, the size of the flat panel speaker is significantly smaller than that of the conventional panel speaker. The flat panel speaker of the present invention can be applied to various products in which a micro speaker is used.

On the other hand, the present invention is not limited and implemented as shown in FIG. For example, since a plurality of planar diaphragms applied to the present invention may be implemented on a flat panel speaker as shown in FIG. 10, embodiments of the flat panel loudspeaker according to the present invention may vary according to the arrangement state of the flat diaphragm. Naturally, it can be changed.

10 is a cross-sectional view showing a state in which the diaphragm diaphragm is extended and applied to the present invention.

As illustrated in FIG. 10, the magnetic bodies 2101 to 210n are arranged at a predetermined distance apart from each other, and the planar diaphragm units 2201 to 220n having current circuits are disposed one by one. Here, the input signal is applied to each current circuit of the flat diaphragm unit 2201 to 220n.

As such, since a plurality of planar diaphragms may be continuously arranged, a flat speaker according to the present invention may also be implemented using a plurality of planar diaphragms as shown in the drawing.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention has the following effects by increasing the magnetic field through the magnetic body attached on the flat diaphragm.

First, it strengthens the sound pressure by increasing the strength of the magnetic field and strengthening the Lorentz force.

Second, the Lorentz force is strengthened by the magnetic field generated by the magnetic body attached to the flat diaphragm, thereby reducing the attenuation of the amplitude of the output sound.

1 is a schematic cross-sectional view of a conventional speaker system.

Figure 2 is a perspective view showing a bonding state of a conventional diaphragm and voice coil.

3 is a cross-sectional view of a voice coil attached to a conventional speaker.

Figure 4 is an exploded perspective view for explaining in detail the introduction of the voice coil, the permanent magnet and the plate according to the conventional speaker principle.

Figure 5 is a perspective view showing a retracted state of the permanent magnet and plate assembly and voice coil in accordance with the conventional speaker principle.

Figure 6 is a perspective view showing the arrangement of the permanent magnet and plate assembly according to the conventional speaker principle.

7 is a view showing the principle of driving force generation in accordance with the conventional speaker principle.

8 is a cross-sectional view of a flat speaker for sound pressure reinforcement according to an embodiment of the present invention.

Figure 9 is an illustration of the current direction flowing on the current circuit of the flat panel speaker according to the present invention.

10 is a cross-sectional view showing a state in which the diaphragm diaphragm is extended and applied to the present invention.

Explanation of symbols on the main parts of the drawings

100: flat panel speaker 110: yoke

120 and 121: first and second magnetic bodies 130: flat diaphragm

140: current circuit 150: protective plate

Claims (5)

A yoke for fixing a plurality of components required for sound reproduction is provided, and first and second magnetic bodies are disposed to be spaced apart from the inside of the yoke, and are vertically spaced apart from the first and second magnetic bodies by a predetermined distance. Planar diaphragm is installed to vibrate naturally and generates sound while vibrating, a current circuit is formed on the planar diaphragm, and third and fourth magnetic bodies are positioned at symmetrical positions on both sides of the planar diaphragm. Flatbed speaker. The method of claim 1, The third magnetic body is disposed below the left side of the flat diaphragm, the fourth magnetic body is disposed below the right side of the flat diaphragm, The flat panel speaker, characterized in that the first and second plates are arranged symmetrically on the upper left and right sides of the flat diaphragm. The method of claim 1, The third magnetic body is disposed below the left side of the flat diaphragm, the fourth magnetic body is disposed below the right side of the flat diaphragm, The flat panel speaker, characterized in that the fifth and sixth magnetic material is disposed symmetrically on the upper left and right of the flat diaphragm. The method of claim 1, The magnetic field generated from the N pole of the second magnetic body is directed toward the S pole of the first magnetic body, The magnetic field generated from the N pole of the fourth magnetic body is directed toward the S pole of the third magnetic body. The method of claim 3, wherein The magnetic field generated from the N pole of the fourth magnetic body is directed toward the S pole of the third magnetic body, And a magnetic field generated from the N pole of the sixth magnetic body is directed toward the S pole of the fifth magnetic body.