KR100785077B1 - Micro speaker - Google Patents

Abstract

The present invention provides a micro speaker having a magnetic circuit capable of eliminating magnetic saturation due to high magnetic density generated at the lower edge of the outer edge of the magnet forming the side wall of the magnetic space in which the voice coil is installed. Such a micro speaker is supported and installed on the frame of the electronic device, and is provided with a magnet, a yoke, a damper, an upper plate, and a diaphragm in the micro speaker for outputting sound by being connected to an electronic circuit of the electronic device. And at least one of the upper plate is formed to have a thickness thicker or thinner than the thickness of the body region of the magnet by increasing or decreasing the thickness at a position corresponding to the outer edge of the magnet.

Description

Micro Speaker {MICRO SPEAKER}

1 is a view for explaining a general inner ring magnet type micro speaker;

2 is a view for explaining a general inner and outer ring magnet type micro speaker;

3 is a magnetic flow diagram of a typical inner ring magnet type micro speaker;

4 is a magnetic density distribution diagram of a typical inner ring magnet type micro speaker;

5 is a magnetic flow chart of a typical inner and outer ring magnet type micro speaker;

6 is a magnetic density distribution diagram of a typical inner and outer ring magnet type micro speaker;

7 is a graph of magnetic properties of steel;

8 and 9 are graphs and drawings for explaining the technical spirit of the present invention;

10 is a view for explaining an inner ring magnet type micro speaker according to the present invention;

11 is a view for explaining the inner and outer ring magnet type micro speaker according to the present invention;

12 is a magnetic flow chart of the micro speaker shown in FIG. 10;

13 is a magnetic density distribution diagram of the micro speaker shown in FIG. 10;

14 is a view showing boundary conditions in the modeling of FIGS. 12 and 13;

15 to 19 are views for explaining the inner and outer ring magnet type micro speaker, which is variously implemented under the technical spirit of the present invention.

Explanation of symbols on the main parts of the drawings

1: (electronic device) frame 10: micro speaker

12: magnetic space 14: voice coil

16: diaphragm 20: magnet

22: (magnet) outer edge 40, 40 ': yoke

50: outer magnet 52: (outer magnet) inner edge

60, 60 ': upper plate 70: outer upper plate

80: damper

The present invention relates to a micro-speaker, and more particularly has a magnetic circuit capable of solving the magnetic saturation due to the high magnetic density generated at the lower side of the outer edge of the magnet forming the side wall of the magnetic space in which the voice coil is installed Relates to a micro speaker.

Recently, a mobile terminal such as a mobile phone has a complex function, and not only reception and transmission, but also internet, video, MP3, and various melodies are implemented. Therefore, the micro speaker applied to the mobile terminal is not only small in size but also improved in performance. The need is simultaneously required.

To this end, the inventor of the Republic of Korea Patent Publication No. 10-0369853 "bidirectional integrated speaker-receiver of a portable communication device", Korean Patent Laid-Open Publication No. 2002-0065419 "bidirectional micro-speaker for mobile communication terminal", publication number Patent No. 2003-0022619 "Receiving Unit for Terminal with Side Soundproofing", Patent Publication No. 10-0534154 "Internal Combination Structure of Micro Speaker for Communication Terminal", Registration No. 10-0482954 "Flat Voice Coil Ultra-slim two-way micro speaker using "" has been proposed.

As described above, despite the small size of the micro speaker due to its high performance demand, the use of ferromagnetic materials is common to generate high electromagnetic force, and the volume of the permanent magnet is relatively large compared to that of other electromagnetic circuit components. The emphasis is to increase. Therefore, as a result of extreme miniaturization, the miniaturization of the micro speaker has reached its limit, and its size is increasing due to the demand for improved performance.

On the other hand, in the structure of the micro speaker, there is an inner ring magnet type micro speaker 500 as shown in Figure 1, and the inner and outer ring magnet type micro speaker 500 'as shown in FIG. In the above-mentioned application of the inventors of the Republic of Korea Patent Publication No. 10-0369853 "bidirectional integrated speaker-receiver of the portable communication device", Publication No. 2003-0022619 "receiving unit for a terminal having a side sound insulation" The proposed technology is related to an inner ring magnet type micro speaker, and Korean Patent Application Laid-Open No. 2002-0065419 discloses a bidirectional micro speaker for a mobile communication terminal, and a registered patent no. 10-0534154 for a micro speaker for a communication terminal. Internal coupling structure ", No. 10-0482954" Ultra-slim two-way micro speaker using a flat voice coil "and the like is a proposed technology in relation to the inner and outer ring magnet type micro speaker.

At this time, the inner ring magnet type micro speaker 500 has a structure in which the voice coil 530 is installed in the magnetic space 520 formed around the outer side of the magnet 510, as shown in FIG. As shown in FIG. 2, the micro speaker 500 ′ has a magnetic space 520 in which an outer magnet 540 is disposed around an outer circumference of the inner magnet 510 ′, and a voice coil 530 is positioned therebetween. It has a structure to be formed.

In order to develop a method for improving the performance of the micro-speaker, as shown in Figures 3 to 6, the inner ring magnet type micro-speaker 500 and the inner and outer ring magnet type micro-speaker 500 'according to the prior art. The magnetic flux and magnetic density distribution of were analyzed.

Referring to FIGS. 3 and 4 with reference to FIG. 1, the inner ring magnet type micro speaker 500 has high efficiency in terms of performance per volume due to saturation due to high magnetic density at the lower edge of the outer edge of the magnet 510. It was difficult to expect. Therefore, even if the size of the magnet 510 is increased as in the prior art, it is impossible to expect an improvement in performance as the size of the magnet is increased.

Referring to FIGS. 5 and 6 with reference to FIG. 2, the inner / outer ring magnet type micro speaker 500 ′ has a saturation caused by high magnetic density at the lower edge of the outer edge of the inner magnet 510 ′, thereby performing performance per volume. In terms of efficiency, it was difficult to expect high efficiency. Therefore, in the case of the inner and outer ring magnet type micro speaker 500 ', even if the size of the inner magnet 510' is increased as in the inner ring magnet type micro speaker 500 described above, the performance is improved by increasing the size of the magnet. You can not expect.

Therefore, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to provide a new type of micro speaker that can improve performance without increasing the size of the micro speaker.

In particular, the present invention provides a magnetic circuit capable of solving the magnetic saturation caused by the high magnetic density generated at the lower side of the outer edge of the magnet forming the side wall of the magnetic space in which the voice coil is installed as described above. It aims to provide a new type of microspeaker that can improve performance without increasing it.

According to a feature of the present invention for achieving the above object, the present invention is a voice coil is arranged in a micro speaker for being supported and installed in the frame of the electronic device, connected to the electronic circuit of the electronic device for outputting sound It includes a magnet having an outer edge so that the magnetic space is formed to the outer periphery, the outer edge of the magnet is formed to have a thickness of any one of a thickness and a thinner than the thickness of the body region of the magnet.

Such a micro speaker according to the present invention further includes an outer magnet having an inner edge, the magnetic space is formed so as to be formed around the inner periphery of the inner edge so as to be spaced apart from the magnetic space by the magnetic space. The inner edge of the outer magnet may be formed to have any one of a thickness thicker and thinner than the thickness of the body region of the outer magnet.

In the micro speaker according to the present invention, the outer edge of the magnet may be formed such that the lower side has any one of a thickness thicker and thinner than the thickness of the body region of the magnet.

According to another aspect of the present invention for achieving the above object, the present invention is supported in the frame of the electronic device, the micro speaker for outputting sound connected to the electronic circuit of the electronic device, magnetic space is A magnet having an outer edge to be formed around the outer side; A yoke attached to a lower surface of the magnet; A damper attached to a lower portion of the yoke; An upper plate attached to an upper surface of the magnet; A diaphragm fixed at both ends to the frame, and coupled to a voice coil positioned in the magnetic space, and disposed above the upper plate; At least one of the magnet, the yoke and the upper plate is formed to have a thickness thicker or thinner than the thickness of the body region of the magnet by increasing or decreasing the thickness at a position corresponding to the outer edge of the magnet.

The micro speaker according to the present invention has an inner edge, the outer magnet is installed so as to be spaced apart by the magnetic space around the outer periphery of the magnet so that the magnetic space is formed around the inner periphery of the inner edge; An outer upper plate attached to an upper surface of the outer magnet to correspond to the upper plate, wherein the yoke extends to the outer magnet and is coupled to the outer magnet; At least one of the outer magnet, the yoke and the outer upper plate is formed to have a thickness thicker or thinner than the thickness of the body region of the outer magnet by increasing or decreasing the thickness at a position corresponding to the inner edge of the outer magnet. Can be.

In the micro speaker according to the present invention, the increase and decrease of the thickness at a position corresponding to the outer edge of the magnet may be formed such that the lower side has any one of a thickness thicker and thinner than the thickness of the body region of the magnet. .

FIG. 7 is a graph of magnetic properties of steel, and FIGS. 8 and 9 are graphs and drawings for explaining the technical spirit of the present invention.

Referring to FIG. 7, it can be seen that the magnetic properties of the steel do not increase significantly even when the magnetic flux density (vertical axis) is greater than 1.4 and the magnetic strength (horizontal axis) increases. In addition, the slope (increase in magnetic flux density with respect to the increase in magnetic strength) in FIG. 7 indicates the magnetic permeability, which is high before saturation but low after saturation. In other words, as the river acts as a saturation, the excess magnetic flux flows through the air, reducing the magnetic efficiency. Therefore, if the saturation state of the magnetic as shown in Figure 8 can be increased more effectively.

Referring to FIG. 9, in the present invention, a voice coil 14 is provided in a micro speaker for supporting and outputting sound by being supported on a frame of an electronic device to obtain such an effect. It includes a magnet 20 having an outer edge 22 so that the magnetic space 12 is formed to the outer periphery, the outer edge 22 of the magnet 20 of the body region (B) of the magnet 20 It is formed to have a thickness of any one of a thickness thicker and thinner than the thickness. This configuration corresponds to the inner ring magnet type micro speaker of (a), and in the case of the inner and outer ring magnet type micro speaker, as shown in (b), it has an inner edge 52 and the magnetic space 12 has an inner edge. In order to form the inner periphery of the 52 to the outer periphery of the magnet 20 further includes an outer magnet (50) spaced apart by the magnetic space 12, the inner edge 52 of the outer magnet (50) It may be formed to have a thickness of any one of a thickness and a thinner than the thickness of the body region (B) of the outer magnet (50).

As described above, in the micro speaker 10 according to the present invention, the thickness of the outer circumferential region A of the magnet 20 in which magnetic saturation is generated is thicker than the thickness of the body region B as described above. By making it thin or having a thin thickness, the magnetic saturation is alleviated so that the magnetic strength can be increased without increasing the size of the micro speaker. In addition, in the case of the inner and outer ring magnet type micro speaker, the thickness of both the outer peripheral region A of the magnet 20 and the outer magnet 50 disposed on both sides of the magnetic space 12 is thicker than the thickness of the body region B. By having a thickness or a thin thickness to increase the mitigation effect of self-saturation.

In particular, the micro-speaker 10 according to the present invention, the body region (B) of the magnet 20, the lower portion of the outer edge 22 of the magnet 20, which is a region where magnetic saturation is concentrated as in the above-described experiment By having a thickness of any one of a thicker and a thinner than the thickness of to minimize the change in the thickness can be obtained a certain effect.

10 is a view for explaining the inner ring magnet type micro speaker according to the present invention, Figure 11 is a view for explaining the inner and outer ring magnet type micro speaker according to the present invention, Figure 12 is a magnetic of the micro speaker shown in FIG. 13 is a flowchart illustrating magnetic density distribution of the micro speaker shown in FIG. 11, and FIG. 14 is a diagram illustrating boundary conditions in modeling of FIGS. 12 and 13.

First, referring to FIGS. 10 and 11, the micro speaker 10 according to the present invention is supported to be installed on the frame 1 of the electronic device and is connected to an electronic circuit of the electronic device to provide sound. Wherein the electronic device is a small terminal such as a mobile phone, the main target, other types of electronic devices that apply a micro-speaker can be applied.

The micro speaker 10 includes a magnet 20, a yoke 40, a damper 80, an upper plate 60, and a diaphragm 16. At this time, the magnet 20 has an outer edge 22 so that the magnetic space 12 is formed around the outer side, the yoke 40 is attached to the lower surface of the magnet 20, the damper 80 of the yoke 40 Attached to the bottom, the upper plate 60 is attached to the upper surface of the magnet 20. Both ends of the diaphragm 16 are fixed to the frame 1, and a voice coil 14 positioned in the magnetic space 12 is coupled to the inside of the upper plate 60. Such a basic micro speaker 10 has the same main configuration as a conventional inner ring magnet type micro speaker, and its operation is also the same, and thus its detailed description is omitted.

Meanwhile, in the micro speaker 10 according to the present invention, at least one of the magnet 20, the yoke 40, and the upper plate 60 corresponds to the outer edge 22 of the magnet 20 (“A in FIG. 9”). The thickness is increased and decreased at " " so as to have a thickness thicker than the thickness of the body region of the magnet 20 (" B " in FIG. 9). At this time, Figure 10 is to increase the thickness of the yoke 40 to obtain such a thickness difference. In particular, FIG. 10 shows a form of utilizing a space where the damper 80 is coupled, and forms a recess 42 into which the damper 80 is inserted and coupled to the bottom of the yoke 40, and the recess 42. ) The protrusions 44 on both sides are disposed at positions corresponding to the outer edges 22 of the magnet 20 to reduce magnetic saturation.

As described above, in the micro speaker 10 according to the present invention, the increase or decrease in thickness at a position corresponding to the outer edge 22 of the magnet 20 is lower than the thickness of the body region of the magnet 20. It is formed to have a thickness of any one of a thick thickness and a thin thickness.

11 illustrates an inner and outer ring magnet type micro speaker 10. The micro speaker 10, as described above, includes a magnet 20, a yoke 40, a damper 80, and an upper plate 60. ), Provided with a diaphragm 16, and further comprises an outer magnet 50 and the outer upper plate 70. At this time, the outer magnet 50 is provided with an inner rim 52 to form the magnetic space 12 around the inner periphery and spaced apart by the magnetic space 12 around the outside of the magnet 20, the outer upper plate ( 70 is attached to the upper surface of the outer magnet 50 so as to correspond to the upper plate 60 so that the inner edge 72 forms the outside of the magnetic space 12. And the yoke 40 is extended to the outer magnet 50 is coupled to the lower surface of the outer magnet 50. Such a micro speaker 10 has the above-described configuration and at least one of the outer magnet 50, the yoke 40, and the outer upper plate 70 corresponds to the inner edge 52 of the outer magnet 50. As the thickness is increased or decreased, the thickness is formed to have a thickness thicker or thinner than that of the body region of the outer magnet 50.

12 to 13, the micro speaker 10 according to the present invention as described above can be seen that the concentration of magnetic density is significantly lowered in the region where the magnetic density is concentrated and saturation occurs. Lower magnetic densities reduce leakage into air due to saturation, leading to higher magnetic densities in the magnetic space in which the voice coil is located. Therefore, the micro speaker 10 according to the present invention can effectively increase the performance while maintaining the size of the micro speaker, unlike the prior art.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, FIGS. 15 to 19, and like reference numerals refer to like elements in FIGS. 15 to 19. On the other hand, in the drawings, the illustration and detailed description of the configuration and its operation and effects which can be easily understood from the general micro-speakers are briefly or omitted, and are shown mainly in the parts related to the present invention.

15 to 19 are views for explaining the inner and outer ring magnet type micro speaker, which is variously implemented under the technical spirit of the present invention.

15 to 19, as described above, the micro speaker 10 according to the present invention can solve the magnetic saturation through various modifications. That is, FIG. 15 shows a groove 24 formed at an outer lower corner of the magnet 20, and a groove 54 formed at an inner lower corner of the outer magnet 50, thereby providing a protrusion 44 ′ of the yoke 40. By showing that the upper side is formed by reducing the thickness of the magnetic saturation region is shown the micro speaker 10 to improve the performance.

16 illustrates a first recess 46 formed inside the upper surface of the yoke 40, and a second recess 48 formed outside the upper surface of the yoke 40 to form the first recess 46 below the magnet 20. By attaching the second magnet 90 to be inserted into the second magnet 50, and attaching the second outer magnet 100 inserted into the second recess 48 to the lower side of the outer magnet 50, the protrusion 44 ′ is attached to the magnet 20. And the micro speaker 10 positioned below the outer magnet 50, that is, in the region where magnetic saturation occurs.

17 shows a second magnet 90 'attached to an outer circumference of the magnet 20, a second outer magnet 100' attached to an inner circumference of the outer magnet 50, and the second magnet 90 'attached thereto. ) And the microspeaker 10 to reduce the magnetic saturation by placing the protrusion 44 'of the yoke 40 below the second outer magnet 100'.

Meanwhile, the micro speaker 10 shown in FIGS. 18 and 19 shows a form in which the magnetic saturation is attenuated by increasing or decreasing the thickness of the upper plate 60. The yoke 40 'of these examples has a thickness different from that of the aforementioned example. No change. That is, the micro speaker 10 shown in FIG. 18 is a protrusion 62 formed upward from the outer edge of the upper plate 60, and the micro speaker 10 shown in FIG. 19 is an upper outer circumference of the magnet 20. As shown in FIG. The furnace recess 24 'is formed, and the protrusion 62' formed inwardly at the outer edge of the upper plate 60 is inserted into the recess 24 'and coupled thereto.

As described above, the micro-speaker according to the preferred embodiment of the present invention is shown in accordance with the above description and drawings, but this is merely described, for example, and various changes and modifications can be made without departing from the spirit of the present invention. It will be understood by those skilled in the art that it is possible.

According to the micro-speaker according to the present invention, since the magnetic saturation is eliminated and the micro speaker has a configuration that improves the performance of the micro speaker, the micro speaker is increased as compared to the conventional technology to improve the performance of the micro speaker. There is an advantage that does not increase the size of the speaker.

Claims (6)

delete In the micro speaker for being supported by the frame of the electronic device, connected to the electronic circuit of the electronic device to output sound, And a magnet having an outer edge such that the magnetic space in which the voice coil is disposed is formed around the outside, wherein the outer edge of the magnet is formed to have a thickness thicker or thinner than the thickness of the body region of the magnet. , An outer magnet having an inner edge and spaced apart by the magnetic space around an outer circumference of the magnet such that the magnetic space is formed around an inner circumference of the inner rim; A micro speaker, characterized in that formed to have a thickness of any one of a thickness and a thinner than the thickness of the body region. delete delete In the micro speaker for being supported by the frame of the electronic device, connected to the electronic circuit of the electronic device to output sound, A magnet having an outer edge such that a magnetic space is formed around the outside; A yoke attached to a lower surface of the magnet; A damper attached to a lower portion of the yoke; An upper plate attached to an upper surface of the magnet; A diaphragm fixed at both ends to the frame, and coupled to a voice coil positioned in the magnetic space, and disposed above the upper plate; An outer magnet having an inner edge and spaced apart by the magnetic space around an outer circumference of the magnet such that the magnetic space is formed around an inner side of the inner edge; An outer upper plate attached to an upper surface of the outer magnet to correspond to the upper plate; At least one of the magnet, the yoke and the upper plate is formed to have a thickness of any one of a thickness and a thinner than the thickness of the body region of the magnet by increasing or decreasing the thickness at a position corresponding to the outer edge of the magnet, At least one of the outer magnet, the yoke and the outer upper plate is formed to have a thickness thicker or thinner than the thickness of the body region of the outer magnet by increasing or decreasing the thickness at a position corresponding to the inner edge of the outer magnet. Micro speaker characterized in that. delete

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