KR100808196B1 - Speaker and method for controlling the same - Google Patents

Abstract

The present invention relates to a speaker and a control method thereof. The present invention provides a first vibration plate for converting an electrical signal input by electromagnetic force into acoustic energy, a second vibration plate for finally radiating acoustic energy, the first vibration plate and the second vibration plate, and in the first vibration plate. It provides a speaker including a connection for transmitting the generated acoustic energy to the second vibration plate.

Speaker conversion

Description

Speaker and method for controlling the same

1 is a cross-sectional view schematically showing a conventional speaker

FIG. 2 is a front view schematically showing a state in which the speaker of FIG. 1 is installed in a TV. FIG.

Figure 3 is a cross-sectional view schematically showing an example of the installation structure of a conventional speaker

4 is a cross-sectional view schematically showing another example of the installation structure of a conventional speaker.

5 is a cross-sectional view schematically showing an embodiment of a speaker according to the present invention.

6 is a cross-sectional view schematically showing another embodiment of a speaker according to the present invention.

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

1: TV 3: Speaker

20: first vibration plate 30, 82: edge

42 bobbin 44 voice coil

52: upper plate 54: lower plate

56: permanent magnet 60: damper

72: connecting portion 80: the second vibration plate

The present invention relates to a speaker and a control method thereof, and more particularly, to a speaker and a control method capable of preventing a deterioration of sound quality while satisfying a slim design. The speaker and its control method according to the present invention are not limited, but are particularly suitable for use in display devices such as TVs.

In general, a speaker refers to an acoustic device that generates sound waves by converting an electrical signal into vibration of a diaphragm to generate a small wave in the air. Such speakers can be classified into various types according to the position of the diaphragm, the shape of the diaphragm, the principle and method of converting an electrical signal into sound waves, and the like. Among them, speakers used in display devices such as TVs are radiant speakers in which the diaphragm is placed directly in the air. When a voice signal current flows to a coil located in a magnetic field formed by a permanent magnet, a mechanical force is applied according to the strength of the current. It is common to use principles that act on and cause exercise.

Referring to Figure 1, the general structure of a conventional speaker is as follows.

The speaker 3 includes energy conversion units 40 and 50 for largely converting an electrical signal into kinetic energy, and a diaphragm 20 for converting kinetic energy generated from the energy conversion units 40 and 50 into acoustic energy. It is configured by.

The energy converter includes a fixed part 50 and a moving part 40 relative to the fixed part 50 by an electromagnetic force corresponding to a sound to be reproduced, and the diaphragm 20 is provided on the moving part 40. Is connected, the sound is reproduced by the vibration of the diaphragm 20.

In detail, the fixing part 50 is supported at a predetermined position of the base frame 70. The fixing part 50 is configured to include a permanent magnet 56, the upper and lower portions of the permanent magnet 56 is provided with an upper plate 52 and a lower plate 54, respectively, the permanent magnet 56 It is common to concentrate the magnetic flux that occurs at. The moving part 40 is generally referred to as a voice coil assembly and comprises a bobbin 42 and a voice coil 44 wound around the bobbin 42. In addition, the diaphragm 20 is connected to the bobbin 42.

Meanwhile, a damper 60 is connected between the base frame 70 and the bobbin 42 to elastically support the bobbin 42. In addition, one side of the diaphragm 20 is connected to the bobbin 42 and the other side is connected to the base frame 70, the elastic support portion 30 (hereinafter referred to as the connecting portion of the bobbin 42 and the base frame 70) It is common to have an "edge").

Referring to the operating principle of the above-described speaker as follows.

When a current is applied to the voice coil 44, an induction force is generated in the coil in the magnetic field formed by the permanent magnet 56, and the voice coil 44 moves forward and backward, and the bobbin connected to the voice coil 44 ( 42 also moves forward and backward. Accordingly, the diaphragm 20 connected to the bobbin 42 also vibrates, ie, vibrates in the front and rear direction. That is, the vibration plate 20 vibrates back and forth in conjunction with the voice coil 44 and the bobbin 42 to vibrate adjacent air to generate sound waves, and the sound applied to the voice coil 44 in the form of an electrical signal. Will be substantially reproduced.

On the other hand, as shown in Figure 2, when the speaker is installed in a display device such as a TV, it is necessary to miniaturize and slim. This is because the space in which the speaker 3 can be installed in the TV 1 is limited. In recent years, since the overall design of the display device occupies a large proportion of the consumer's preference, it is a tendency to increase the degree of freedom in design by slimming down and miniaturizing visible parts such as the speaker 3 other than the TV screen unit 12. Therefore, it is necessary to further miniaturize and slim the speaker.

However, when the speaker is downsized and slimmed, there is a problem in that the sound reproduction capability of the speaker is limited. This is because in the case of a general speaker, since electromagnetic force is transmitted to the diaphragm through the bobbin, the sound is radiated in the direction of the piston's movement of the bobbin, that is, the energy converter. . In particular, in the case of a display device that is large-scaled in recent years, deterioration of speaker sound quality, which is not suitable for a large screen unit, becomes a big problem. In order to solve this problem, a subwoofer is mounted separately from the miniaturized speaker to compensate for the deteriorated reproduction band.

Meanwhile, as shown in FIGS. 3 and 4, the speaker 3 is mounted inside the TV, and the structures 5a and 5b having a predetermined shape are mounted on the front of the speaker 3 and the front cover 10 of the TV. Attempts have been made to spread the sound or to change the direction of radiation. FIG. 2 illustrates a case in which a structure 5a having a horn-like front surface is installed between the front cover 10 and the speaker 3 of the TV to spread the sound. 3 illustrates a case in which a structure 5b having a predetermined angle inclined shape is installed between the front cover 10 and the speaker 3 of the TV to change the radiation direction of the sound.

However, in this case, the deterioration of the sound quality of the high frequency occurs due to the resonance caused by the natural frequency in the structures 5a and 5b. For example, in the case of the speaker shown in FIG. 3, experiments have deteriorated the sound quality in the high frequency band of 2.5 kHz or more. Therefore, a high frequency speaker such as a tweeter 3a (see FIG. 2) was separately mounted to compensate for the deteriorated high frequency.

The problems of the above-described conventional speaker are summarized as follows.

First, in the conventional speaker, since the sound is radiated in the vertical direction of the moving part, that is, the bobbin, it is difficult to obtain a slim and desired level of sound quality.

Second, in the case of using the structure for the diffusion of sound or the change in the radiation direction, there is a disadvantage that the high-frequency sound quality deterioration occurs to use a separate high-frequency speakers.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a speaker that satisfies miniaturization and can prevent degradation of sound quality.

In order to achieve the above object, the present invention includes a first vibration plate for converting an electrical signal input by the electromagnetic force into acoustic energy; A second vibration plate for finally radiating acoustic energy; The speaker may include the first vibration plate and the second vibration plate, and include a connection unit configured to transfer acoustic energy generated by the first vibration plate to the second vibration plate.

Preferably, the second vibration plate is inclined at a predetermined angle with respect to the first vibration plate. In addition, the connection portion is preferably inclined at a predetermined angle with respect to the first vibration plate. The connection portion is preferably provided with a predetermined medium, and the medium is preferably at least one of liquid and air.

According to another embodiment of the present invention, the present invention includes a conversion step of converting an electrical signal into acoustic energy by electromagnetic force; Delivering said acoustic energy; Provided is a control method of a speaker comprising a radiating step of finally radiating transmitted acoustic energy. In the transferring step, it is preferable to change the propagation angle of the acoustic energy.

According to the present invention described above, it is possible to prevent deterioration of sound quality while miniaturizing a speaker.

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

In order to avoid duplicate descriptions, the same parts as in the prior art have the same names and the same reference numerals, and detailed description thereof will be omitted.

5, a preferred embodiment of a speaker according to the present invention will be described.

Similar to the prior art, the speaker according to the present invention also comprises an energy conversion unit 40, 50 and a diaphragm 20 (hereinafter referred to as "first vibration plate" for convenience). That is, it has a fixed portion 50 is configured to include a permanent magnet 56, the upper plate 52 and the lower plate 54. It also has a moving part 40 including a bobbin 42 and a voice coil 44. Furthermore, it has a damper 60 for supporting the bobbin 42 and an edge 30 for supporting the first vibration plate 20 (hereinafter referred to as "first edge" for convenience).

However, in the present invention, unlike the prior art, it has a second vibration plate 80 for finally radiating acoustic energy. And, it has a connection portion 72 for transmitting the acoustic energy generated in the first vibration plate 20, that is, vibration to the second vibration plate 80 without loss.

It will be described in detail as follows.

The front portion of the speaker is provided with a connecting portion 72, the first portion of the vibration plate 20 and the second vibration plate 80 is accommodated. That is, the first vibration plate 20 is provided at the inlet side of the connecting portion 72 and the second vibration plate 80 is provided at the outlet side. Of course, the second vibration plate 80 is preferably elastically supported by the connecting portion 72 by the second edge (30).

On the other hand, the connection portion 72 is preferably sealed in order to transfer the acoustic energy generated in the first vibration plate 20 to the second vibration plate 80 without loss. In addition, the connection portion 72 is preferably provided with a predetermined medium. The medium may be used separately or in combination of liquid, water soluble liquid, air and the like, and may be appropriately selected and used to reduce the loss of acoustic energy. In addition, it is preferable that the connection portion 72 and the medium have a large difference in density to increase the radiation impedance to prevent leakage of acoustic energy.

On the other hand, the connection portion 72 may be configured separately from the base frame 70, it is also possible to be formed integrally with the base frame 70, of course. And, using a separate structure (not shown) connected to the base frame 70, and using a connecting portion 72 for receiving the first vibration plate 20 and the second vibration plate 80 in the interior of the structure separately. Of course it is possible.

In FIG. 5, the second vibration plate 80 is inclined at a predetermined angle with respect to the first vibration plate 20, and the connection portion 72 is inclined at a predetermined angle with respect to the vibration direction of the first vibration plate 20. The present invention is not limited to this. That is, even if the second vibration plate 80 is not inclined with respect to the first vibration plate 20 or the connecting portion 72 is substantially parallel to the vibration direction of the first vibration plate 20, the present invention applies the principles of the present invention. It is possible. In addition, as shown in Fig. 6, it is also possible to install the first vibration plate 20 inclined.

Referring to Figure 5, the operation of the speaker according to the present invention will be described.

When an electrical signal is applied to the voice coil 44, the voice coil 44 is moved back and forth, that is, the piston movement by the interaction with the permanent magnet 56. Accordingly, the bobbin 42 connected to the voice coil 44 also pistons, and the first vibration plate 20 connected to the bobbin 42 also vibrates by piston movement.

The acoustic energy due to the vibration of the first vibration plate 20 is transmitted to the second vibration plate 80 through the connection portion 72. In this case, acoustic energy may be transmitted to the second vibration plate 80 without loss by the medium filled in the connection part 72, and the progress of the acoustic energy generated in the first vibration plate 20 due to the shape of the connection part 72. The angle will change. The second vibration plate 80 vibrates by the acoustic energy transmitted through the connection portion 72, and finally the acoustic energy is radiated to the outside in a direction perpendicular to the second vibration plate 80, so that the sound is reproduced.

That is, according to the present invention, the sound is reproduced including a conversion step of converting an electrical signal into acoustic energy by electromagnetic force, transmitting and transmitting the acoustic energy, and a radiation step of finally radiating the transmitted acoustic energy do. Finally, sound is emitted in the vertical direction of the second vibration plate 80 irrespective of the first vibration plate 20.

Meanwhile, in the above-described embodiment, although the first vibration plate 20 and the second vibration plate 80 are flat and illustrated, the present invention is not limited thereto, and it is of course possible to use the cone type vibration plate shown in FIG. 1. . That is, there is no restriction | limiting in the shape of a diaphragm.

In addition, as in the above-described embodiment, it is preferable to use in a display device such as a TV, but is not limited thereto, and of course, it is also possible to use in other devices.

The effect of the speaker according to the present invention described above is as follows.

First, according to the present invention, the shape of the second vibrating plate to which the actual sound is radiated independently of the shape of the first vibrating plate connected to the voice coil can be changed according to the manufacturer's intention, thereby securing a vibration area necessary for securing a slim and reproducing band. Can be. Therefore, according to the present invention, there is an advantage that the speaker can be slimmed down and downsized while preventing degradation of sound quality.

Second, according to the present invention, the force transmitted to the voice coil and the first vibration plate by the application of the electrical signal is transmitted at various angles other than the vertical, there is an advantage that it is possible to design the angle in which the sound is radiated in the desired direction.

Claims (7)

A first vibration plate converting an electrical signal input by electromagnetic force into acoustic energy; A second vibration plate for finally radiating acoustic energy; And a connection part accommodating the first vibration plate and the second vibration plate and transferring the acoustic energy generated by the first vibration plate to the second vibration plate. The speaker of claim 1, wherein the first vibrating plate is arranged to vibrate at an arbitrary angle, and the second vibrating plate is arranged to vibrate at an arbitrary angle independently of the first vibrating plate. . The speaker of claim 1 or 2, wherein the connection part is formed to be inclined at a predetermined angle so that an advancing angle of sound energy generated in the first vibration plate is changed. The speaker of claim 1 or 2, wherein the connection part is sealed together with the first vibration plate and the second vibration plate. The speaker of claim 4, wherein a medium including at least one of liquid and air is provided inside the connection unit. A conversion step of converting an electrical signal by electromagnetic force into acoustic energy by a first vibration plate; A transfer step of transferring the acoustic energy to a second vibration plate; And a radiation step in which the second vibration plate finally radiates acoustic energy. The method of claim 6, wherein the delivering step, And transmitting the sound energy generated by the first vibration plate to the second vibration plate by changing an advancing angle along the connection part.

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