KR20080038542A - Flatbed speaker - Google Patents

Abstract

The present invention relates to a speaker composed of a flat plate diaphragm, and more particularly, to a method of generating sound by shaking a diaphragm with secondary vibration after propagating vibration. The method of generating a sound source of a speaker according to the present invention is to contact the at least one concave vibration transmission plate for transmitting the vibration to at least one vibrator receiving the acoustic signal so that its center portion is in contact with the vibrator, The outer circumferential surface is integrally coupled to the vibration transmitting plate so that vibration is applied from the circumferential surface of the diaphragm to the center portion to generate a sound source. The speaker formed in this way can be made within a thickness of several tens of mm, it is possible to manufacture an environment-friendly speaker without using an adhesive or the like.

Description

Flat Speakers {Loudspeaker using flat diaphragms}

1 and 2 are views of a conventional speaker in which a sound source is generated by the voice coil,

3 is a view of a flat speaker by a vibrator,

4 is a cross-sectional view of a flat speaker according to a first embodiment of the present invention;

5 is a cross-sectional view showing another embodiment of the diaphragm in FIG. 4,

6 and 7 are a cross-sectional view and a plan view of a flat speaker according to a second embodiment of the present invention, and

8 is a cross-sectional view showing another embodiment of the diaphragm shown in FIG. 6.

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

100,200: flat speaker 120,220: vibrator

130,230: vibration plate 140,240: vibration plate

150,250 Fixed Forest 160,260 Resonance Room

170,270: Sound absorbing or dustproof material

The present invention relates to a speaker and a speaker system for converting an electrical signal into an acoustic signal, and more particularly, to a speaker having a thin thickness of a speaker and a shape of a diaphragm.

The existing speaker system consists of a driving speaker unit that converts an electric signal into a vibration signal and then emits an acoustic signal, and an enclosure that provides an elastic load to the speaker while preventing the interference of front and rear sounds emitted by the unit. have.

1 to 3 are diagrams showing a speaker according to the prior art, and FIG. 1 is a view disclosed in Korean Utility Model Model No. 308111 (driver unit structure of a speaker), and FIG. 2 is a Korean Patent No. 435850 (flat plate). 3) is a diagram disclosed in Korean Laid-Open Patent Publication No. 2003-36075 (a flat sound emitter having a supported exciter and compliant surround).

As shown in FIGS. 1 and 2, the diaphragms of the driving speakers 1 and 2 are directly connected to the voice coils, and are composed of magnetic circuits that supply a static magnetic field to the amplitude and the voice coils.

In addition, although the speaker 3 for driving the flat plate diaphragm using a separate vibrator as shown in Figure 3 is disclosed, in the case of a speaker to which the vibrator is applied among the speakers to which the flat plate diaphragm is applied, have.

That is, the existing speakers have a structure in which the voice coil or the vibrator is directly coupled to or attached to the diaphragm in order to generate sound by vibrating the diaphragm.

The speaker attached to the diaphragm of FIGS. 1 and 2 as described above has a problem that it is impossible to manufacture the speaker below a certain thickness in order to realize performance due to the magnetic circuit supplying the amplitude of the voice coil and the static magnetic field. There was this. In addition, in order to apply a diaphragm having a large diameter to expand the reproduction frequency band, a larger diameter voice coil and a magnetic circuit are required.

As a result, even if the diaphragm is flat, the thickness of the speaker is the same as that of the conventional dynamic cone speaker.

On the other hand, in the case of the method of generating sound by vibrating the diaphragm with the vibrator in Figure 3 there was a problem that the vibration source applied to the diaphragm is limited to one place.

As a result, the vibrating plate is divided into vibrations according to the position of the vibrator, and the sound characteristics reproduced according to the position of the vibrator are distorted.

In addition, when the large diaphragm must be driven for low frequency reproduction, the size of the vibrator must be large or a plurality of vibrators must be arranged. In this case, distortion of the reproduction sound may occur due to the influence between the vibrations generated by the plurality of vibrators.

In particular, in the case of existing speakers applying the principle of generating sound by vibrating the diaphragm with a vibrator, low frequency reproduction of several hundred hz or less is difficult due to the divided vibration of the diaphragm.

The present invention has been made to solve the above problems, an object of the present invention is to provide a flat speaker that can implement an ultra-thin speaker within a few tens of mm by using a vibrator, a vibration transmission plate and a diaphragm.

The present invention to achieve the above object,

At least one concave vibrating plate for transmitting the vibration to at least one vibrator receiving the sound signal and vibrating the center thereof is brought into contact with the vibrator, and one or more vibrating plates are integrally formed with the vibrating plate. It is coupled to provide a flat speaker characterized in that the vibration is applied to the center portion from the circumferential surface of the diaphragm to generate a sound source.

At this time, the vibration transmission plate may be provided in a single plate shape integrally fixed so that a single vibrator fixed to the bottom plate in contact with the center on the lower surface of the vibration transmission plate.

Alternatively, the vibration transmitting plate may include a plurality of triangular plates having a cross-sectional shape of “<” shape in a concave rectangular plate shape and overlap each other to form a plurality of vibrators on each vibration transmitting plate at a central point where all the vibration transmitting plates meet. Can be configured to touch.

Here, it is preferable that the diaphragm is clamped to the radial end of the vibration transmitting plate.

Alternatively, the diaphragm may be provided in plural numbers spaced apart from each other, and may be coupled to an inner inclined surface of the vibrating plate.

And the outer edge of the vibration transmission plate may further include a fixed forest for supporting the vibration transmission plate.

And, it is preferable that a protection net for protecting the diaphragm is formed on the inner surface of the fixed rim.

In addition, it is preferable that the lower side or the inner empty space of the vibration transmitting plate is used as a resonance chamber, and a sound absorbing material or a dustproof material is filled in the resonance chamber on either side.

Hereinafter, a flat speaker according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

<Example 1>

4 is a cross-sectional view of a flat panel speaker according to a first embodiment of the present invention, and FIG. 5 is a cross-sectional view showing another embodiment of the diaphragm in FIG. 4.

The flat panel speaker according to the first embodiment of the present invention relates to a speaker composed of a single vibrator and a single vibration transmitting plate.

The speaker 100 according to the first embodiment of the present invention includes a bottom plate 110, a vibrator 120, a vibration transmission plate 130, and a vibration plate 140.

The bottom plate 110 (back plate) is a basic structure that determines the appearance in the configuration of the speaker and is also used to attach the necessary support when hanging or standing the speaker on the wall. The vibrator 120 is mounted at the center on the upper surface of the bottom plate 110. In order to mount the vibrator 120 as described above, a mounting part 111 protruding upward is formed integrally on the upper surface of the bottom plate 110.

As described above, the vibrator 120 is inserted into and mounted on the seating part 111 of the bottom plate 110, and generates vibration by an input signal. In this case, as the vibrator 120 used, Korean Patent Publication No. 1999-46111 (Ultra Bone Speaker), Korean Patent Publication No. 2005-78583 (Waterproof Oscillation Speaker) and Korean Patent Application Publication No. 1998-83959 (Bone Chart and Airway) It is a vibrator based on the same principle as the bone conduction vibrator for both hearing and hearing. Alternatively, it is also possible to use a small actuator made of a piezoelectric element.

Meanwhile, a signal input line 121 connected to the vibrator 120 extends through the bottom plate 110 on the bottom surface of the bottom plate 110.

The vibration transmitting plate 130 is disposed above the vibrator 120.

The vibration transmitting plate 130 is a beam or plate to which the vibration signal generated by the vibrator 120 is transmitted, and has a concave shape that radially opens in an upward direction. The tip portion of the center on the lower surface of the vibration transfer plate 130 is in contact with the upper portion of the vibrator 120.

The vibration plate 140 is coupled to the upper surface of the vibration transmission plate 130 formed as described above.

At this time, the vibration transmission plate 130 and the vibration plate 140 is coupled to the vibration plate 140 so that the vibration plate 140 can be transmitted without loss, so the possible vibration plate 140 and the vibration transmission plate 130 is possible It is preferable to comprise it integrally.

In addition, it is preferable that the circumference of the diaphragm 140 is clamped 131 in order to transmit the vibration of the vibrating plate 130 to the diaphragm 140 with a minimum loss. That is, the radial end of the vibration transmission plate 130 is formed to protrude upward at a predetermined height, and the vibration plate 140 is closely coupled between the protrusions.

)는 진동판(140)의 형상(원형판, 사각판 등)에 따라 달라지고 다음과 같은 수식에 의해 주어진다.And the natural frequency of the diaphragm 140

) Depends on the shape of the diaphragm 140 (circular plate, square plate, etc.) and is given by the following equation.

Here, B is a value given according to the vibration module mode of the diaphragm, and the value is determined according to the shape of the diaphragm (for example, 11.84 in the first mode in the case of a circular diaphragm clamped around the diaphragm, and a square diaphragm Is given by 10.40).

는 Young's modulus이고,

Is Young's modulus,

는 진동판의 두께이고,

Is the thickness of the diaphragm,

는 진동판의 밀도이고,

Is the density of the diaphragm,

는 진동판의 직경이고,

Is the diameter of the diaphragm,

는 Poission's ratio이다.

Is Poission's ratio.

That is, the reproduction band can be determined according to the material, thickness and shape of the diaphragm.

Alternatively, the diaphragm 140 ′ may be configured in plural.

That is, the plurality of diaphragms 140 ′ having a smaller size than the vibrating plate 130 may be spaced apart from each other and coupled to the central portion on the upper surface of the vibrating plate 130. The reason why the plurality of diaphragms 140 'are formed in this manner is as an auxiliary purpose, so that the diaphragm 140' can be easily installed to have a dedicated regeneration band. In addition, when applying the plurality of diaphragms 140 'as described above, the divided vibration of the diaphragm 140' may be suppressed by the compressed air between the diaphragms 140 '.

On the other hand, the radial end of the vibration transmitting plate 130 is further provided with a fixed rim 150 for holding and supporting the vibration transmitting plate 130.

The fixed rim 150 forms the exterior of the speaker while fixing the vibration transmission plate 130. The fixed rim 150 has a change in vibration transmission efficiency according to its material. When the material of the fixed rim 150 is a soft material such as rubber, the vibration signal having the opposite direction to the vibration transmission plate 130 is applied. Transmitted from the end of the fixed rim 150 may cause secondary vibration, which may cause harmonics. When the material of the fixed rim 150 is made of a material such as metal, a signal whose phase is reversed is reflected to generate a vibration signal. Since the effect of extinction can be produced, it is necessary to design the material of the fixed rim 150 and the shape of the end of the vibration transmission plate 130 to disperse the reflected signal.

That is, since the influence of the reflected wave depends on the elasticity of the fixed rim 150, mechanical impedance matching with the vibration transmission plate 130 should be considered separately.

To this end, a portion composed of the same material as the vibration transmission plate 130 capable of the material of the fixed rim 150 is combined with the vibration transmission plate 130 and gradually decreases in density toward the outside of the fixed rim 150 while losing internal losses. The construction of this large material is one of the methods for minimizing the reflected waves caused by the fixed rim 150.

Another method is to change the vibration transmission path by bending the end of the vibration transmission plate 130 as shown in FIG. In this case, the bending angle of the vibration transmitting plate 130 should be as smooth as possible to minimize dispersion of the vibration signal.

And the upper side of the diaphragm 140 is further provided with a protection net 151 fixed by connecting the inside of the fixed rim 150.

On the other hand, between the vibration transmission plate 130 and the bottom plate 110, because the vibration transmission plate 130 has a radially open shape in an upward direction, a space is formed therebetween.

Such a space is opened to the outside so that the resonance chamber 160 in which resonance sound is generated is naturally formed. The resonance chamber 160 serves as a labyrinth enclosure that is applied in the existing speaker system by forming pores in the vibration transmission plate when the resonance generated by the diaphragm 140 is required for amplification or reproduction of low frequency sound. You can do

In addition, the resonance chamber 160 on the other side is filled with a sound absorbing material or a dustproof material 170. The sound absorbing material or the vibration damping material 170 may be used to suppress or control the role of the resonance chamber 160. The sound absorbing material or the vibration damping material 170 may be inserted to improve the frequency response characteristics of the reproduction band.

The speaker 100 formed as described above is transmitted with the vibration generated from the vibrator 120 along the vibration transmission plate 130, and the transmitted vibration is transmitted from the place where the vibration plate 140 is coupled (clamping) to the vibration plate 140. And vibrates the diaphragm from the circumference of the diaphragm 140 toward the center of the diaphragm 140.

<Example 2>

6 and 7 are cross-sectional views and plan views of a flat speaker according to a second embodiment of the present invention, and FIG. 8 is a cross-sectional view showing another embodiment of the diaphragm shown in FIG. 6.

The speaker according to the second embodiment of the present invention relates to a speaker including a plurality of vibrators and a plurality of vibration transfer plates.

The speaker 200 according to the second embodiment includes a plurality of vibration transmitting plates 230, a plurality of vibrators 220, and a diaphragm 240.

At this time, it is preferable that the overall shape is formed to have a rectangular plate shape by overlapping the triangular plates of the same size to form a plurality of vibration transfer plate 230 in a concave shape to radially open upward.

In other words, if the four inclined triangular plates overlap each other, the center is concave and the square corner portion is raised upward. Here, the vibration transmission plate 230 is formed in the shape of the cross section "<". Therefore, the vibrator 220 is attached to each vibration transfer plate 230 at the point where the four vibration transfer plates 230 meet in the middle. At this time, the vibrator separating plate 222 is provided between the vibrators 220 to prevent the interference of the vibration.

The upper and lower radial ends of the vibration transmission plates 230 are coupled to the clamping plate 231 as in the first embodiment.

In addition, on the outer circumferential surface of the vibration transmission plate 230, the same fixed rim 250 as in the first embodiment is provided to support the vibration transmission plate 230.

Meanwhile, a resonance chamber 260, which is a space similar to that of the first embodiment, is formed inside the vibration transmission plate 230, and the sound absorbing material or the vibration damping member 170 is filled in the other side of the resonance chamber 260.

Therefore, the speaker 200 according to the second embodiment is to generate sound in the up, down direction.

Alternatively, the speaker 200 according to the second embodiment may be configured with a plurality of vibration plates 240 as in the first embodiment.

As described above, the flat panel speaker according to the present invention can manufacture a speaker having a thickness of several tens of millimeters by applying a micro vibrator and a plate-shaped vibration transfer plate.

According to the present invention, it is possible to change the playing band according to the installation position and the size change of the diaphragm by the method using the secondary vibration.

In addition, the present invention is capable of installing a diaphragm for a number of auxiliary purposes. That is, it is easy to install a plurality of diaphragms having a dedicated reproduction band.

In addition, in the present invention, since the vibration force acts uniformly from the circumference of the diaphragm, the divided vibration of the diaphragm can be suppressed.

In addition, when applying a plurality of diaphragms, the divided vibration of the diaphragm can be suppressed by the compressed air between the diaphragms.

In addition, the existing speakers have been using a variety of adhesives when assembling the diaphragm and coil, the diaphragm and the frame, magnetic circuit, the present invention can be used for the environment, such as adhesive can be excluded.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

Claims (9)

At least one concave vibration transmission plate for transmitting the vibration to at least one vibrator receiving the sound signal and vibrating the center thereof to contact the vibrator, and one or more vibration plates are integral with the vibration transmission plate. Flat panel speaker characterized in that the vibration is applied to the center portion from the circumferential surface of the diaphragm to generate a sound source. The flat panel speaker of claim 1, wherein the vibration transmitting plate is provided in an integral single plate shape so that the single vibrator fixed to the bottom plate is in contact with the center of the lower surface of the vibration transmitting plate. The vibration transmitting plate of claim 1, wherein the vibration transmitting plate has a plurality of triangular plates having a cross-sectional shape of "<" shape and overlaps each other in a concave rectangular plate shape, so that the vibrator is located at a central point where all of the vibration transmitting plates meet. Flat panel speaker, characterized in that configured to be in contact with each vibration transmitting plate. The flat panel speaker of claim 2 or 3, wherein the diaphragm is clamped to a radial end of the vibration transfer plate. The flat panel speaker of claim 2 or 3, wherein the diaphragm is provided in plural numbers spaced apart from each other, and coupled to an inner inclined surface of the vibrating plate. The flat panel speaker of claim 2 or 3, further comprising a fixed rim supporting the vibration transmission plate at an outer edge of the vibration transmission plate. The flat plate of claim 6, wherein the fixed rim is made of a material having a high internal loss while gradually forming a portion to be coupled with the vibration transmission plate with the same material as the vibration transmission plate and gradually decreasing toward the outside. speaker. The flat panel speaker of claim 6, wherein a protection net for protecting the diaphragm is formed on an inner surface of the fixed rim. The flat panel speaker according to claim 2 or 3, wherein a lower space or an inner empty space of the vibration transmission plate is used as a resonance chamber, and a sound absorbing material or a dustproof material is filled in the resonance chamber on any one side.

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