KR19990041872A - Speaker structure with double voice coil - Google Patents

Abstract

The present invention relates to a double voice coil type speaker device, which induces electronic deflection inside the CRT due to vibration of the water tube electrode and voice field of the body of the speaker in a television, so that a plurality of horizontal patterns are formed on the screen. In order to solve the problem in which the microphoning phenomenon occurs, a spring 150 is used when connecting to the main body instead of the edge of the speaker, and a pair of voice coils 134 and 144 are connected to one conduit plate 120. ) And the bobbins 135 and 145, the spring is buffered vibration of the speaker, and even if a small current is applied to the voice coil, it is possible to escape the high range due to the resonance phenomenon of the cone vibration plate, It is an invention to prevent the micro-phoning phenomenon that causes the electron deflection induction in the imaging tube due to the magnetic field of the coil.

Description

Speaker structure with double voice coil

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device for converting electrical energy into an acoustic signal. The present invention relates to a speaker device for preventing vibration of a radio or television main body by using a spring, and by installing a pair of voice coils and bobbins on one diaphragm, The present invention relates to a double voice coil type speaker device capable of avoiding a high frequency limit due to the resonance phenomenon of a cone vibration plate, and preventing a microphoning phenomenon causing an electromagnetic deflection induction in the imaging tube due to the magnetic field of the voice coil. .

In general, with the recent development of the industrial society, advanced audio equipment is rapidly generalized, and many people are enjoying audio.

In addition, audio products that have been conceived and used only for listening to music now add the ability to record, edit and preserve the state closest to the original. Audio devices such as these have been luxury home appliances that have been used for the purpose of sound reproduction, and are now scattered around us as an important necessity that is indispensable in our real life.

Speakers that convert electrical signals to sound in such audio devices will not be overlooked as an important part of realizing audio devices.

Hereinafter, with reference to the accompanying Figure 1 will be described the structure of the most commonly used cone-shaped speaker and its operation will be described.

1 is a cross-sectional view showing the configuration of a general speaker.

As shown in FIG. 1, the loudspeaker includes a vibrometer including a cone vibration plate 1, an edge 8, a voice coil 2, a damper 6, a center cap 7, and the like, a magnet 3, Magnetic circuit portion including center pole 5, yoke 13, frame 9 and the like, frame 9, gasket 10, terminal 11, surface supporting the magnetic circuit portion and vibrometer It consists of a main-body part containing the solid line 12 etc.

The frame 9 serves as a mother body for attaching a vibrometer and a magnetic circuit, and requires low resonance and high robustness.

The magnetic circuit installed in the lower part of the frame 9 acts to move the bobbin 14 by applying a direct current magnetic field to the bobbin 14 at right angles to the bobbin 14, which is called a field coil type. And let the current flow through it. The center pole 5, yoke 13 and plate 4 are magnetized by the magnet 3 to guide the magnetic flux from the magnet 3 to the gap (between bobbin and plate) without loss. For this purpose, the material, shape and cross-sectional area become important factors. The material is usually low carbon steel.

The voice coil 2 is wound around the bobbin 14, the hollow portion of the bobbin 14 inserts the center pole 5, and receives the electric input from the amplifier to operate the bobbin 14 up and down.

The damper 6 connecting the outer circumferential surface of the upper end of the bobbin 12 and the inner circumferential surface of the frame 9 is also called a center holder, and the voice coil 2 is moved at the center of the gap, and the plate 4 It prevents contact with the center pawl (5), and serves to ensure that the voice coil (2) and the cone vibration plate (1) is in the right position in the stopped state.

The center cap 7 installed along the inner circumferential surface of the neck portion of the cone vibrating plate 1 is attached to prevent dust from entering the center pole 5 as can be known by the dustproof cap. The reinforcement of the neck portion of the cone vibrating plate 1 or vibrates itself, so that there is radiation of sound from the cap, and the frequency characteristic varies depending on the material, shape, and size, and thus the sound quality changes.

The edge 8 connecting the upper circumferential surface of the cone vibration plate 1 and the upper circumferential surface of the frame 9 is for supporting the cone vibration plate 1 in the correct position. It should not affect the driving of 1).

These edges 8 are largely divided into two types, one of which is called a fixed edge, which forms the edge 8 at the same time when the cone vibration plate 1 is manufactured, and the other is formed separately. The cone vibration plate 1 is attached to (8), which is called a free edge.

At present, most products of the free edge are available, and there are various materials and shape processing methods depending on the purpose.

The gasket 10 connecting the edge 8 and the frame 9 has an edge 8 at the frame 9 to prevent the edge 8 from being easily removed by vibration of the cone oscillating plate 1. It is used to laminate lamination ball, rubber, cork, resin, etc. by fixing it closely.

By the above configuration, that is, the plate 3, the center pole 5 and the yoke 13 are magnetized by the magnet 3, and the direction of the magnetic flux is from the center pole 5 to the magnet 3 In a situation in which the plate 4 is installed in the upper end, the AC current signal output through the amplifier is conducted to the voice coil 2 through the terminal 11. Accordingly, the magnetic force is generated in the direction of the center cap 7 by Fleming's left hand law. Accordingly, the bobbin 14, on which the voice coil 2 is wound, moves upward, and the cone vibration plate 1 vibrates. That is, the degree of upward movement of the bobbin 14 varies according to the magnitude of the signal outputted from the amplifier (the magnitude of the current), and thus, the degree of vibration of the cone oscillation plate 1 also varies, so that different sound waves are generated.

According to the vibration of the cone vibrating plate 1, the air which is in contact with the cone vibrating plate 1 is moved, and the movement of the air is transmitted to the human ear as sound waves. The human ear perceives this sound wave as sound.

However, such a speaker has a problem that not only the coupling structure is complicated, but also the manufacturing process is complicated by the configuration of the coupling structure and the damper of the edge and the cone vibration plate.

In addition, the diaphragm of such a speaker is not a perfect rigid body, and when the frequency is increased, the vibration is generated. First, the edge around the cone vibration plate resonates in the mid range, and if the frequency continues to increase, the damper near the portion where the cone vibration plate is attached and the neck portion of the gon vibration plate become effective, causing resonance. Since sound waves are not generated above the resonance point, such a high frequency limit is called.

That is, the speaker described above does not generate sound waves due to the cone vibration plate and the edge when the frequency is increased to some extent (in the case of the high range), and only noise occurs, and the frame vibrates due to the vibration of the edge. In addition to the vibration of the frame, a case such as a television or a radio on which the frame is fixed also vibrates. In addition, when a high output is to be received from the speaker, a high current must be applied to the voice coil. In this case, the magnetic field generated by the voice coil affects the electrodes around the imaging tube.

By inducing electron deflection inside the CRT due to the vibration of the electrode due to the vibration of the main body and the magnetic field of the voice coil, there is a problem that a microphoning phenomenon occurs in which a plurality of horizontal patterns are formed on the screen.

Therefore, the present invention was devised to solve the above problems, and an object of the present invention is to use a spring when connecting to the main body instead of the edge of the speaker, thereby preventing vibration of the radio or television main body, By installing a pair of voice coils and bobbins, even if a small current is applied in the voice coils, the high frequency limit can be avoided due to the resonance phenomenon of the cone vibration plate, and the magnetic field of the voice coils causes micro deflection induction in the image tube. The present invention provides a double voice coil type speaker device that prevents panning.

1 is a block diagram showing a typical speaker device.

Figure 2 is a perspective view of a double voice coil speaker device according to the present invention.

3 is a cross-sectional view showing a double voice coil speaker device according to the present invention.

Figure 4a to d is a surface waveform diagram for explaining the resonance phenomenon according to the present invention.

<Explanation of symbols for main parts of the drawings>

100: double voice coil type speaker device 110: frame

112: lower side plate 114: left and right side plate

120: diaphragm 130: first yoke

132: first magnet 133: first plate

134: first boil coil 135: the first bobbin

136: 1st center pole 140: 2nd yoke

142: second magnet 143: second plate

144: second boil coil 145: second bobbin

146: second center pole 150: spring

The double voice coil speaker device of the present invention for achieving the above object is a frame consisting of a lower side plate and a left and right side plate protruding upwards at both ends of the lower plate, and fixed to the lower plate of the frame, First and second center poles protruding upward, each yoke formed on the left and right sides around the first and second center poles, each magnet installed on the yoke, and installed on the magnets A plate, hollow first and second bobbins for inserting the first and second center poles, first and second bobbins wound around first and second bobbins at positions corresponding to the plates, and One diaphragm connecting upper ends of the first and second bobbins, and a plurality of springs connecting the edges of the diaphragm and the left and right plates of the frame are provided.

According to the above configuration, as the output is divided and applied to the first and second voice coils, the formation of the magnetic field is reduced in the voice coils, and the resonance phenomenon of the sound waves occurs according to the same sound waves output from the voice coils. High current is realized as a low current, and vibration is not transmitted to the main body of the radio or television due to the vibration absorbing action of the spring.

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

2 to 4 are views showing one embodiment of the present invention, Figure 2 is a perspective view showing a double voice coil type speaker device according to the present invention, Figure 3 is a double voice coil type speaker device according to the present invention 4 is a surface waveform diagram for explaining the resonance phenomenon according to the present invention.

As shown in FIG. 2, the speaker device of the present invention includes a frame 110, respective yokes provided on the left and right sides of the first and second center poles 136 and 146 and the center poles 136 and 146. (130) 140, magnets 132 and 142, plates 133 and 143, first and second bobbins 135 and 145, first and second voice coils 134 and 144, The diaphragm 120 and the spring 150 are included.

The frame 110 is composed of a lower plate and left and right side plates 114 installed upwardly at both ends of the lower plate.

The first and second center poles 136 and 146 fixed to the lower plate 112 of the frame 110 are fixed to protrude upward from the lower portion of the lower plate to be described below. It is inserted into the inside of the (145).

The yokes 130 and 140 are fixed to the lower left and right sides of the first and second center poles 136 and 146.

The first and second magnets 132 and 142 installed on the yokes 130 and 140 each have a direct current at right angles when current flows through the first and second voice coils 134 and 144. It is the main part of making a magnetic field by acting to give a magnetic field to move. Permanent magnets are also called alumino-based, ferrite-based or recently rare earth high-balt-based. The rare earth cobalt system is composed of a rare earth metal and a compound of cobalt, and is a material having a large maximum energy product (BH), which is the first criterion indicating the performance of the magnet.

The first and second plates 133 and 143 respectively installed on the upper portions of the magnets 132 and 142 are configured to guide the magnetic flux from the magnets 132 and 142 to the gap (between the plate and the bobbin). In order to lead without loss, the material, shape and cross-sectional area are important factors. The material is usually low carbon steel, and in the case of large magnetic fluxes, pure iron or demands are used.

The first and second bobbins 135 and 145 into which the first and second center poles 136 and 146 are inserted are hollow, and the first and second voice coils 134 and 144 are hollow. The linear force is caused by the electromagnetic force of.

The first and second voice coils 134 and 144 are wound around the first and second bobbins 135 and 145 at positions corresponding to the plates 133 and 143, respectively, and a predetermined current from the amplifier. When is applied, the electromagnetic force is formed by the magnetic field formed from each of the plates 133, 143, yoke 130, 140, center poles 136, 146, magnets 132, 142, The bobbins 135 and 145 are linearly moved.

The diaphragm 120 connecting the upper ends of the first and second bobbins 135 and 145 uses one diaphragm 120 to expect a resonance phenomenon. The diaphragm 120 may be manufactured in a planar shape to maximize the resonance phenomenon.

In addition, a plurality of springs 150 connecting the diaphragm 120 and the left and right side plates 114 of the frame 110 are radially installed around the first and second voice coils 134 and 144. To anticipate resonance of the sound waves, and the first and second voice coils 134 and 144 are installed at 1/4 positions at both left and right ends of the diaphragm 120, respectively. The linear motion formed from

The operation of the present invention will be described with reference to FIGS. 3 to 4 according to the configuration of the present invention as described above.

4A shows the surface wave when the diaphragm starts to vibrate, b shows the surface wave showing the state just before the sound wave interferes, and c shows the surface wave when the interference of the sound wave starts. D represents the surface wave in the interference.

First, as shown in FIG. 3, the first plate 133, the center pole 136, and the yoke 130 are magnetized by the first magnet 132 inside the speaker, and the direction of the magnetic flux is the first center pole ( At 136, the second plate 143, the center pole 146, and the yoke 140 are magnetized by the second magnet 142 while being in the direction of the first plate 133 provided at the upper end of the first magnet 132. In the situation where the direction of the magnetic flux is made from the second center pole 146 toward the second plate 143 provided at the upper end of the second magnet 142, the same AC signal amplified by the amplifier is generated. The first and second voice coils 134 and 144 wound on the second bobbins 135 and 145 are respectively applied.

Accordingly, when current is applied to the first and second voice coils 134 and 144, the electromagnetic force is generated in the direction of arrow P by Fleming's left-hand law (electromotive force is generated when current flows across the magnetic flux). Accordingly, the first and second bobbins 134 and 144 wound around the first and second bobbins 135 and 145 move together in the direction of the arrow P, and thus, a part of the diaphragm 120. Only when the vibration is as shown in Figure 4a, and after a certain time elapses as shown in Figure 4b the surface wave before interference. Thereafter, the air facing the diaphragm 120 vibrates according to the vibration of the diaphragm 120, and the vibration of the air is transmitted to the human ear as sound waves. Finally, the human ear perceives this sound wave as sound.

Subsequently, when the AC signal increases from the amplifier to a certain degree, currents flowing through the first and second voice coils 134 and 144 also become large, so that each voice coil 134 and 144 has an electromagnetic force. In addition, the linear motion of the first bobbin 135 and the second bobbin 145 is also increased. That is, the vibration plate 120 is vibrated larger than before, so that the sound waves spread from the vibration plate 120 also becomes large. That is, as shown in Figure 4b, as the sound wave starts to interfere, the vibration of the diaphragm 120 is increased and the waveform due to the interference of the sound wave is also increased.

Thereafter, when a certain time elapses, sound waves continue to interfere as shown in FIG. 4D, and the sound can be infinitely high.

Here, the spring 150 absorbs the vibration of the diaphragm 120 to prevent the transmission of the vibration to the television or radio body. In addition, the elastic modulus of the spring 150 has a great influence on the vibration of the diaphragm 120, and becomes an important function for adjusting the sound height. That is, when the coefficient of the spring 150 increases, the vibration of the diaphragm 120 is reduced, and thus the resonance phenomenon is reduced, so that the sound level is lowered.

In addition, the spring is installed radially around the center of the first and second boy coils (134, 144), thereby preventing partial vibration of the diaphragm 120 to evenly oscillate inside the diaphragm 120 As expected, the diaphragm 120 emits sound waves efficiently, and the interference effect of the sound waves can also be used to the maximum value.

As described above, the double voice coil speaker device according to the present invention uses a spring instead of the edge of the speaker to reduce vibration of the main body, and by installing a pair of voice coils and bobbins on one diaphragm, Even if a current is applied, the high frequency limit can be avoided due to the resonance phenomenon of the resonator plate (reinforcement interference), and the high efficiency is expected at low power, and when a single voice coil is used to obtain high power, the magnetic field of the voice coil is There is an effect to prevent the electronic deflection induction phenomenon (microphone phenomenon) of the imaging tube that can be caused by.

Claims (4)

A frame 110 composed of a lower side plate 112, a left and right side plate 114 protruding upwards at both ends of the lower side plate 112, and First and second center poles 136 and 146 fixed to the lower plate 112 of the frame 110 and protruding from a lower portion to an upper portion thereof; Each of the yokes 130 and 140 formed on the left and right sides with respect to the first and second center poles 136 and 146, The magnets 132 and 142 installed on the yokes 130 and 140 respectively, Plates 133 and 143 installed on the upper portions of the magnets 132 and 142, Hollow first and second bobbins 135 and 145 for inserting the first and second center poles 136 and 146, First and second voice coils 134 and 144 wound around the first and second bobbins 135 and 145 at positions corresponding to the plates 133 and 143, One diaphragm 120 connecting upper ends of the first and second bobbins 135 and 145, Double voice coil type speaker device (100), characterized in that a plurality of springs (150) for connecting the edge of the diaphragm 120 and the left and right side plates (114) of the frame (110) is provided. The double voice coil type speaker device according to claim 1, wherein the diaphragm 120 has a flat shape, so that resonance of sound waves can be maximized. The double voice of claim 1, wherein the first and second voice coils 134 and 144 are installed at quarter points at both ends of the diaphragm 120 to obtain an optimum balance of vibration. Coil type speaker device. The method of claim 1, wherein the spring 150 is installed radially around the central portion of the first and second boy coils 134, 144, to prevent partial vibration of the diaphragm 120. Double voice coil type speaker unit.