KR100488654B1 - Speaker having two magnetic circuit - Google Patents

Abstract

The present invention relates to a loudspeaker having two magnetic circuits. The present invention relates to a speaker having two magnetic circuits, wherein the first magnetic circuit portion and the second magnetic circuit portion for generating a magnetic force to vibrate the voice coil are provided. The voice coil vibrates by the action of the first magnetic circuit portion and the second magnetic circuit portion in which magnetic force is increased by installing a magnet. Therefore, the amplitude of the voice coil is increased to improve the sound output.

Description

Speaker having two magnetic circuits {SPEAKER HAVING TWO MAGNETIC CIRCUIT}

The present invention relates to a speaker having two magnetic circuit parts provided with two magnetic circuit parts which work with the voice coil to vibrate the voice coil.

 Hereinafter, a conventional speaker will be described in detail with reference to the accompanying drawings. 1 is a cross-sectional view showing a conventional speaker.

As shown, the conventional speaker 1 has an annular frame 10 having a through hole formed in the center thereof. On the outside of the portion where the through-hole of the frame 10 is formed, the magnetic circuit part 20 generating the magnetic force while having the magnet 23 and the pole piece 25 stacked and coupled to the yoke 21 and the yoke 21 is coupled. do.

The vibrator 30 is installed inside the frame 10, and the vibrator 30 has an upper end side coupled to an upper side of the frame 10 and an upper end side coupled to the diaphragm 31, and a lower end side thereof. It is located inside the magnetic circuit unit 20 and has a voice coil 33 which vibrates up and down by the action of the magnetic circuit unit 20 when power is applied.

Thus, when external power is applied to the voice coil 33, the voice coil 33 vibrates by the action of the magnetic circuit unit 20, and the vibration plate 31 vibrates by the vibration of the voice coil 33 to generate sound. do.

However, the conventional speaker configured as described above is provided with one magnetic circuit unit 20 which vibrates the voice coil 33 by working with the voice coil 33, so that the amplitude of the voice coil 33 is small and the sound output is reduced. There is a disadvantage of deterioration.

The present invention was created in order to solve the problems of the prior art as described above, and an object of the present invention is to provide two magnetic circuits for generating a magnetic force to vibrate the voice coil, thereby increasing the amplitude of the voice coil to increase the sound output. The present invention provides a speaker having two magnetic circuit parts that can be improved.

A speaker having two magnetic circuit units according to the present invention for achieving the above object, the frame formed with a through hole in the center; A first magnetic circuit part having a first yoke, a first magnet, and a first pole piece which are sequentially stacked and coupled to each other and coupled to an outer surface portion of the frame in which the through hole is formed; The second pole piece and a second magnet and a second yoke sequentially stacked above the first magnetic circuit portion, the second pole piece is opposed to the first pole piece and the second pole piece A second magnetic circuit portion having a polarity opposite to that of the end side of the first magnet in contact with the first pole piece having a polarity opposite to that of the end side of the first magnet in contact with the first pole piece; A third magnet provided between the first pole piece and the second pole piece and having a polarity at a lower end side of the first pole piece having the same polarity as that of an end side of the first magnet in contact with the first pole piece; An outer circumferential surface side is coupled to an upper side of the frame, and an inner circumferential surface has a voice coil which vibrates the diaphragm while vibrating by the action of the diaphragm having a predetermined interval with the outer surface of the third magnet and the first and second magnetic circuit parts. The voice coil is formed in a cylindrical shape and surrounds the third magnet while the outer surface center portion is attached to the inner circumferential surface of the diaphragm, and the lower end portion and the upper end portion are respectively located inside the first and second magnetic circuit portions and the bobbin and the first and second portions. And a vibrator having coils wound on a lower end side and an upper end side of the bobbin positioned inside the magnetic circuit unit.

Hereinafter, a speaker having two magnetic circuit units according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 2 is a cross-sectional view of a speaker having two magnetic circuit units according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating magnetic flux density of a speaker having two magnetic circuits according to an embodiment of the present invention.

As shown, the speaker 100 having two magnetic circuit units has a frame 110 having a through hole formed in the center thereof. The first magnetic circuit unit 120 is coupled to an outer side of the portion where the through-hole of the frame 110 is formed, and the first magnetic circuit unit 120 is U-shaped to form a first yoke having an upper edge portion coupled to the frame 110. 121 and the first magnet 123 and the first pole piece 125 are sequentially stacked and coupled inside the first yoke 121. At this time, the outer surfaces of the first magnet 123 and the first pole piece 125 has a predetermined distance from the first yoke 121.

The second magnetic circuit unit 130 is provided inside the frame 110. The second magnetic circuit unit 130 includes a cap and a second magnet 133 stacked on an upper surface of the second pole piece 131 and the second pole piece 131 positioned to face the upper side of the first pole piece 125. It has a second yoke 135 provided in a shape and coupled to an upper surface of the second magnet 133 to accommodate the second pole piece 131 and the second magnet 133. At this time, the inner surface of the second yoke 135 has a predetermined distance from the outer surface of the second pole piece 131 and the second magnet 133. The polarity of the lower end of the second magnet 133 in contact with the upper surface of the second pole piece 131 may be equal to the polarity of the upper end of the first magnet 123 in contact with the lower surface of the first pole piece 125. Has the opposite polarity. That is, if the polarity of the upper end side of the first magnet 123 is the N pole, the polarity of the lower end of the second magnet 133 has the S pole.

A third magnet 140 is provided between the first magnetic circuit unit 120 and the second magnetic circuit unit 130 to increase the magnetic force of the first magnetic circuit unit 120 and the second magnetic circuit unit 130. The lower end side of 140 is in contact with the top surface of the first pole piece 125 and the upper end side is in contact with the bottom surface of the second pole piece 131. At this time, the lower end side of the third magnet 140 has the same polarity as that of the upper end side of the first magnet 123 and the upper end side has the same polarity as the polarity of the lower end side of the second magnet 133.

Then, since the magnetic forces on the upper end side of the first magnet 123 and the lower end side of the third magnet 140 are mutually repelled, the magnetic force on the upper end side of the first magnet 123 and the lower end side of the third magnet 140. Magnetic force is moved to the first yoke 121 side through the first pole piece 125 without being dispersed outward. This increases the magnetic flux density between the outer circumferential surface of the first pole piece 125 and the inner circumferential surface of the first yoke 121 (see FIG. 3). In addition, since the lower end side of the second magnet 133 and the upper end side of the third magnet 140 have the same polarity, the magnetic flux density between the outer circumferential surface of the second pole piece 131 and the inner circumferential surface of the second yoke 135 is also increased. do.

In addition, the frame 110 is provided with a vibration unit 150 for generating sound while vibrating by the action of the first magnetic circuit unit 120 and the second magnetic circuit unit 130, the vibration unit 150 is a diaphragm 151 and voice coil 153. The outer circumferential surface side of the diaphragm 151 is coupled to the upper side of the frame 110 and the inner circumferential surface is installed in a form surrounding the outer surface of the third magnet 140 while having a predetermined interval with the outer surface of the third magnet 140. The voice coil 153 has a cylindrical shape and has a bobbin 155 surrounding the outer circumferential surface of the third magnet 140 and a coil 157 wound around the bobbin 155.

The outer center portion of the bobbin 155 is attached to the inner circumferential surface of the diaphragm 151 and the lower portion is positioned between the outer surface of the first pole piece 125 and the inner surface of the first yoke 121, and the upper end side thereof is the second pole piece 131. It is located between the outer surface of and the inner surface of the second yoke 135. At this time, the coil 157 is wound around the lower end side and the upper end side of the bobbin 155 corresponding to the outer surfaces of the first pole piece 125 and the second pole piece 131.

The operation of the speaker having the two magnetic circuit units configured as described above will be described. Since the lower end side and the upper end side of the third magnet 140 have the same polarity as the upper end side of the first magnet 123 and the lower end side of the second magnet 133, as described above, the first magnetic circuit unit ( The magnetic force of the 120 and the second magnetic circuit unit 130 is increased.

When an external power source is applied to the coils 157 wound on the lower end side and the upper end side of the bobbin 155, respectively, the lower end side and the upper end side of the voice coil 153 are the first and second magnetic circuit units 120 and 130. The voice coil 153 vibrates while acting with each other, and the vibration plate 151 vibrates by the voice coil 153 to generate sound. At this time, the power applied to the coils 157 wound on the upper end side and the lower end side of the bobbin 155 may vibrate by the action of the lower end side of the voice coil 153 and the first magnetic circuit unit 120 ( The vibration direction of the 153 and the vibration direction of the voice coil 153 vibrating by the action of the upper end side of the voice coil 153 and the second magnetic circuit unit 130 are applied to be the same.

Then, since the voice coil 153 vibrates by the action of the first magnetic circuit unit 120 and the second magnetic circuit unit 130 having increased magnetic force, the amplitude of the voice coil 153 increases.

A speaker having two magnetic circuit units according to the present invention may be configured to have an external magnetic shape of the first magnetic circuit unit, which will be described with reference to FIG. 4. FIG. 4 is a diagram illustrating a speaker having two magnetic circuit units according to another exemplary embodiment of the present invention, and illustrates only differences from FIG. 2.

As shown in the drawing, the first magnetic circuit unit 170 sequentially surrounds the protrusions of the first yoke 171 and the first yoke 171 with the central portion protruding / formed upward. The first magnet 173 and the first pole piece 175 are stacked and coupled to each other. At this time, the upper surface of the first pole piece 175 is coupled to the outer surface of the frame 110, the through hole is formed. In addition, the configuration of the second magnetic circuit unit 130, the third magnet 140 and the vibration unit 150 is the same as the embodiment of the present invention.

As described above, in the speaker having two magnetic circuit parts according to the present invention, the voice coil is vibrated by the action of the first magnetic circuit part and the second magnetic circuit part in which the magnetic force is increased by the third magnet. That is, since the voice coil vibrates by the two magnetic circuit units, the amplitude of the voice coil is increased, and the sound output is improved.

In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.

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

2 is a cross-sectional view of a speaker having two magnetic circuits according to an embodiment of the present invention.

Figure 3 is a view showing the magnetic flux density of a speaker having two magnetic circuits according to an embodiment of the present invention.

4 is a cross-sectional view of a speaker having two magnetic circuits according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110 frame 120 first magnetic circuit portion

130: second magnetic circuit portion 140: third magnet

150: vibrating unit

Claims (1)

A frame having a through hole formed in a central portion thereof; A first magnetic circuit part having a first yoke, a first magnet, and a first pole piece which are sequentially stacked and coupled to each other and coupled to an outer surface portion of the frame in which the through hole is formed; The second pole piece and a second magnet and a second yoke sequentially stacked above the first magnetic circuit portion, the second pole piece is opposed to the first pole piece and the second pole piece A second magnetic circuit portion having a polarity opposite to that of the end side of the first magnet in contact with the first pole piece having a polarity opposite to that of the end side of the first magnet in contact with the first pole piece; A third magnet provided between the first pole piece and the second pole piece and having a polarity at a lower end side of the first pole piece having the same polarity as that of an end side of the first magnet in contact with the first pole piece; An outer circumferential surface side is coupled to an upper side of the frame, and an inner circumferential surface has a voice coil which vibrates the diaphragm while vibrating by the action of the diaphragm having a predetermined interval with the outer surface of the third magnet and the first and second magnetic circuit parts. The voice coil is formed in a cylindrical shape and surrounds the third magnet while the outer surface center portion is attached to the inner circumferential surface of the diaphragm, and the lower end portion and the upper end portion are respectively located inside the first and second magnetic circuit portions and the bobbin and the first and second portions. And a vibrating portion having coils wound on a lower end side and an upper end side of the bobbin positioned inside the magnetic circuit unit.