WO2011030968A1

WO2011030968A1 - Multifunctional micro speaker

Info

Publication number: WO2011030968A1
Application number: PCT/KR2009/007323
Authority: WO
Inventors: 이상호; 권철영; 장홍규
Original assignee: 주식회사 비에스이
Priority date: 2009-09-11
Filing date: 2009-12-08
Publication date: 2011-03-17
Also published as: TWM384483U; CN201608887U; TW201110718A; KR101057077B1; CN102026070A; KR20110027996A

Abstract

The present invention relates to a multifunctional micro speaker. The multifunctional micro speaker of the prevent invention comprises: a frame; a vibration plate including an outer circumference fixed to the frame; a voice coil fixed to a lower surface of the vibration plate; a first suspension which includes an outer circumference fixed to the frame and has elasticity; a yoke which is fixed to the first suspension and includes a bottom portion and a sidewall portion; a first permanent magnet fixed to the bottom portion; a plate fixed on an upper surface of the first permanent magnet; and a first stopper which is separately arranged from the sidewall portion to prevent the leaning bias of the yoke.

Description

Multifunction micro speaker

The present invention relates to a multi-function micro speaker, and more particularly, to a multi-function micro speaker having an improved structure to control the one-side movement displacement of the yoke, the magnet and the plate constituting the magnetic circuit of the multi-function micro speaker.

Generally, a speaker is a device that converts an electrical signal into a voice signal. Micro-speakers are mainly small speakers for small sized audio equipment, such as mobile phones, laptops, MP3 players, earphones, etc., which are in high demand in recent years.

However, recent electronic products employing micro-speakers, particularly mobile communication terminals such as mobile phones, have a configuration for generating vibration signals. The vibration signal is used as a signal in place of an incoming call signal or as a signal for confirming an input state in a touch screen method of directly inputting information on a screen.

The multifunctional micro speaker of the present invention refers to a speaker having not only a basic function of generating sound but also a configuration for generating a vibration signal. The multifunctional micro speaker is variously called a multifunctional actuator or a multifunctional electro-acoustic transducer.

The multifunctional micro-speaker of the conventional structure is a structure which acquires a vibration by resonating the vibrating body supported by the plate-shaped spring. Such a conventional multifunctional micro speaker has a voice coil in the magnetic circuit on the side of the diaphragm, also called a vibration plate, which generates sound when a current for a voice signal is applied, and generates vibration when a current for a vibration signal is applied to the voice coil. The system is adopted.

A multifunctional micro speaker of a conventional configuration will be described with reference to FIG. The conventional multifunctional micro speaker 100 includes a case 110, a vibration generating plate 101 for sound generation, a voice coil 102, a permanent magnet 104 and a plate 103 in which an N pole and an S pole are disposed in an up and down direction. And a yoke 105, an upper suspension 107, and a lower suspension 108. Current is applied to the voice coil 102 via the lead line a 114 and the lead line b 115.

The upper end of the voice coil 102 is fixed to the lower surface of the diaphragm 101. The voice coil 102 is wound in the vertical direction. The plate 103 is fixed to the upper surface of the permanent magnet 104. The permanent magnet 104 forms a speaker magnetic circuit together with the plate 103 and the yoke 105 and constitutes a vibrating body. Weight may be added to the vibrating body as needed. The vibrating body is elastically supported by the case 110 by the upper suspension 107 and the lower suspension 108.

The operation of the multifunctional micro speaker 100 having such a configuration will be described. When a current suitable for sound is applied to the voice coil 102 through the lead wire a 114 and the lead wire b 115, electromagnetic force is generated in the voice coil 102, which causes the diaphragm 101 to vibrate. Sound output is made.

In other words, the magnetic force lines emerging from the N pole of the permanent magnet 104 form a magnetic field passing through the plate 103, the voice coil 102, and the yoke 105 in turn to the S pole of the permanent magnet 104. At this time, when the electromagnetic force is generated in the voice coil 102, it interacts with the magnetic flux by the magnetic circuit, and the diaphragm 101 fixed to the voice coil 102 is vibrated to function as a speaker for outputting sound.

On the other hand, when a current suitable for vibration (usually a low frequency current) is applied to the voice coil 102, the vibrating body including the permanent magnet 104, the plate 103, and the yoke 105 moves vertically and vibrates. Will occur.

However, in such a conventional multifunctional micro speaker, since the components constituting the magnetic circuit also serve as a vibrating body, the movement of the vibrating body and the movement of the diaphragm interfere with each other, and the magnetic force lines and the voice coil 102 flow. The Lorentz force generated by the mutual reaction of the currents acts in various directions, causing the voice coil 102 to cause non-vertical vibration. In some cases, the voice coil 102 collides with the plate 103 or the yoke 105. It will be damaged.

In addition, the conventional multi-function micro-speaker, there is a problem that the yoke 105 is pushed to one side by the external shock while pressing the voice coil 102 to be damaged. In addition, as shown in Figure 6, the conventional multi-function micro speaker employing a suspension structure similar to the suspension employed in the present invention, the upper side is fixed to the yoke 105 when the yoke 105 is pulled to one side by an external impact. The suspension 107 and the lower suspension 108 may be pushed in one direction, which may cause a serious problem of tearing the long holes formed in the

suspensions

107 and 108.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a multifunctional micro speaker capable of controlling one-side movement displacement of a yoke, a magnet, and a plate.

In order to achieve the above object, the multifunctional micro speaker of the present invention includes a frame; A diaphragm having an outer circumferential portion fixed to the frame; A voice coil fixed to the lower surface of the diaphragm; A first suspension having an outer circumferential portion fixed to the frame and having elasticity; A yoke fixed to the first suspension and having a bottom portion and a sidewall portion; A first permanent magnet fixed to the bottom portion; A plate fixed to an upper surface of the first permanent magnet; And a first stopper spaced apart from the side wall portion to prevent one side deflection of the yoke.

In addition, the first stopper is preferably spaced apart from the first suspension.

In addition, the first stopper is preferably formed to protrude from the inner peripheral surface of the frame.

In addition, the yoke is preferably fixed to the upper surface of the first suspension.

In addition, a second stopper spaced apart from the first stopper, the first suspension is preferably disposed between the first stopper and the second stopper.

In addition, the second stopper is preferably protruded from the inner peripheral surface of the frame.

In addition, the central portion of the first suspension is provided with a boss protruding upward, the yoke is preferably provided with a yoke receiving groove coupled to the boss of the first suspension.

In addition, the yoke receiving hole penetrating the central portion of the yoke; A permanent magnet accommodating hole penetrating the central portion of the first permanent magnet; A plate receiving hole penetrating the central portion of the plate; And a boss portion protruding upward from a central portion of the first suspension, wherein the yoke accommodation hole, the permanent magnet accommodation hole, and the plate accommodation hole communicate with each other, and an upper end of the boss portion is formed with at least an inner circumferential surface of the yoke accommodation hole. It is preferable to arrange | position in the facing position.

In addition, at least a portion of the upper end of the boss portion of the first suspension is preferably provided with a bent portion.

In addition, the second suspension is disposed spaced downward from the first suspension, the outer peripheral portion is fixed to the frame, the second suspension having elasticity; And a second magnet fixed to the second suspension but spaced apart from the first suspension and the yoke.

In addition, it is preferably provided with a third stopper spaced apart from the outer peripheral portion of the second magnet, protruding from the inner peripheral surface of the frame.

On the other hand, the multifunctional micro speaker according to the present invention for achieving the object of the present invention, the frame; A diaphragm having an outer circumferential portion fixed to the frame; A voice coil fixed to the lower surface of the diaphragm; A first suspension having an outer circumferential portion fixed to the frame, having an elasticity, and having a first through hole formed in a central portion thereof; A yoke fixed to an upper surface of the first suspension; A first permanent magnet fixed to the bottom portion; A plate fixed to an upper surface of the first permanent magnet; And a fourth stopper protruding from the bottom of the frame and inserted into the first through hole and spaced apart from the inner circumferential surface of the first through hole.

In addition, the first suspension is provided with a boss portion protruding upward from the first through hole, the yoke is provided with a yoke receiving groove to which the boss portion of the first suspension is coupled, and the upper end of the fourth stopper is at least the It is preferable to arrange | position in the position which faces the inner peripheral surface of a 1st through-hole.

In addition, the yoke receiving hole penetrating the central portion of the yoke; A permanent magnet accommodating hole penetrating the central portion of the first permanent magnet; A plate receiving hole penetrating the central portion of the plate; And a boss portion protruding upward from the first through hole, wherein the yoke receiving hole, the permanent magnet receiving hole, and the plate receiving hole communicate with each other, and an upper end of the boss portion faces at least an inner circumferential surface of the yoke receiving hole. It is preferable to arrange | position in the position to make

In addition, the second suspension is disposed spaced downward from the first suspension, the outer periphery is fixed to the frame, the second suspension is elastic, and the second through hole through which the fourth stopper is formed; And a second magnet fixed to a lower surface of the second suspension, and a second magnet receiving hole through which the fourth stopper penetrates is formed in a central portion of the second magnet, and the fourth stopper accommodates the second magnet. It is preferable to be spaced apart from the inner circumferential surface of the ball.

In addition, the protrusion protruding from the outer circumferential surface of the lower end of the fourth stopper and spaced apart from the second magnet is preferably formed.

According to the multi-function micro speaker according to the present invention, by controlling the one-side movement displacement of the yoke, the first permanent magnet, and the plate constituting the magnetic circuit to control the yoke, the first permanent magnet, the one-side pull phenomenon of the plate, the magnetic circuit The displacement amplitude of the part can be adjusted.

It also provides the effect of controlling the unilateral movement displacement and amplitude of the vibrator.

In addition, by minimizing mutual interference between the magnetic circuit and the vibrator, it provides an effect of reducing the non-vertical vibration.

1 is a schematic cross-sectional view of a conventional multifunctional micro speaker,

2 is a schematic cross-sectional view of a multifunctional micro speaker of one embodiment of the present invention;

3 is a schematic cross-sectional view of a multifunctional micro speaker of another embodiment of the present invention;

4 is a schematic cross-sectional view of a multifunctional micro speaker of still another embodiment of the present invention;

5 is a schematic cross-sectional view of a multifunctional micro speaker of another embodiment of the present invention;

6 is a schematic plan view of the suspension employed in the embodiment of FIG.

10 ... frame 20 ... diaphragm

30 ... voice coil 40 ... first suspension

50 ... York 60 ... First permanent magnet

70 ... plate 80 ... second suspension

90. 2nd magnet 100 ... 1st stopper

140 ... fourth stopper

A multifunctional micro speaker of an embodiment according to the present invention will be described in detail with reference to FIGS. 2 to 6.

Figure 2 is a schematic cross-sectional view of a multi-function micro speaker according to an embodiment of the present invention, Figure 3 is a schematic cross-sectional view of a multi-function micro speaker according to another embodiment of the present invention, Figures 4 and 5 are yet another embodiment of the present invention A schematic cross section of a multifunctional micro speaker according to the invention.

The multifunctional micro speaker 1 of this embodiment is mainly used in a mobile communication terminal such as a mobile phone and a small device such as a PMP, and has a sound generating function and a vibration generating function as a signal at the same time.

First, referring to FIG. 2, the multifunction micro speaker 1 according to the present embodiment includes a frame 10, a first stopper 100, a fourth stopper 140, a diaphragm 20, and a voice coil 30. ), The first suspension 40, the yoke (yoke) 50, the first permanent magnet (60). The plate 70 is configured to include a second suspension 80 and a second magnet 90.

The frame 10 is usually made of plastic, forms the external shape of the speaker, and various components are fixed therein. The frame 10 includes an upper frame 12, a lower frame 13, and a bottom cover member 11. The upper cover member 14 is coupled to the upper portion of the upper frame 12. In the present embodiment, the frame 10 is generally cylindrical in shape. However, in another embodiment, the shape of the cross section of the frame may be rectangular, elliptical or track shape. In each case, the internal parts can also be modified as appropriate to their external shape.

The first stopper 100 and the fourth stopper 140 are provided to adjust the one-side movement displacement of the yoke.

First, the first stopper 100 is spaced apart from the side wall portion 56 of the yoke 50 by a predetermined distance so as to prevent one-sided tilting of the yoke 50. In the present embodiment, the first stopper 100 is formed to protrude from the inner circumferential surface of the frame 10. The first stopper 100 serves to control a displacement that moves to one side when the yoke 50 is pulled in the left and right directions due to an external shock or the like applied to the non-vertical vibration of the diaphragm 20 or the speaker. By controlling the separation distance between the first stopper 100 and the side wall portion 56, the one-side movement displacement can be controlled.

In addition, the first stopper 100 is spaced apart from the first suspension 40 in the vertical direction. The distance between the first stopper 100 and the first suspension 40 may be adjusted so that the amplitude of the first suspension 40 in the vertical direction does not exceed a desired value.

The fourth stopper 140 protrudes upward from the center of the bottom cover member 11. The fourth stopper 140 extends upward through the second magnet receiving hole 92 of the second magnet 90 and the second through hole 82 of the second suspension 80 so as to extend upward. It is inserted into the first through hole 41 of 40. The fourth stopper 140 is spaced apart from the inner circumferential surface of the first through hole 41 and spaced apart from the inner circumferential surface of the second magnet receiving hole 92. In the present embodiment, an upper end of the fourth stopper 140 is disposed at a position facing at least an inner circumferential surface of the first through hole 41. That is, the upper end of the fourth stopper 140 may be further extended upward to face the yoke receiving groove 52. Thus, the fourth stopper 140 may control the one-side movement displacement of the first suspension 40 and the yoke 50.

In addition, in the present embodiment, a protrusion 141 spaced apart from the second magnet 90 is formed on the outer circumferential surface of the lower end of the fourth stopper 140. In this embodiment, the inner diameter of the first through hole 41 is smaller than the inner diameter of the second through hole 82, and the inner diameter of the receiving hole 92 of the second magnet 90 is the second through hole. It is formed almost equal to the inner diameter of the ball 82. Accordingly, by controlling the separation distance between the protrusion 141 of the fourth stopper 140 and the second magnet 90, the one-side movement displacement of the second magnet 90 and the second suspension 80 can be controlled. have.

The diaphragm 20 has its outer circumference fixed to an upper portion of the upper frame 12. The diaphragm 20 is circular and is usually made of a high molecular compound. The diaphragm 20 vibrates up and down to produce a sound pressure that can be heard by a person.

In the present embodiment, the diaphragm 20 is divided into an inner part located inside and an outer part located outside based on a boundary portion where the upper end of the voice coil 30 is coupled. The inner part and the outer part are each dome-shaped, and the boundary part is flat. The outer part is also called the edge. The diaphragm can vary in specific shapes, materials, and thicknesses.

The voice coil 30 is fixed to the lower surface of the diaphragm 20. The upper end of the voice coil 30 is fixed to the lower surface of the boundary of the diaphragm 20. The voice coil 30 is formed by winding a conductive wire in an upward direction. The voice coil 30 is electrically connected to a terminal (not shown) provided in the frame. The voice coil 30 is supplied with current from the outside via a terminal.

The lower portion of the voice coil 30 is positioned in a space between the first permanent magnet 60 and the plate 70 coupled in the vertical direction and the side wall portion 56 of the yoke 50. This space is called a magnetic gap. When a high frequency current for the acoustic signal flows through the voice coil 30, the voice coil 30 moves in the vertical direction due to a mutual relationship with the magnetic field generated by the first permanent magnet 60. As a result, the diaphragm 20 coupled to the voice coil 30 vibrates to generate sound.

The first suspension 40 has elasticity and its outer circumferential portion is fixed to the frame 10. The suspension may be referred to as an elastic member, a spring or a plate spring. The elasticity refers to the property of changing the volume and shape when an external force is applied to the object and then returning to the shape of Bondi when the force is removed. The elasticity is divided into volume elasticity and shape elasticity according to the type of deformation. In the case of the present invention, the first suspension 40 is mainly related to shape elasticity.

In the case of this embodiment, the first suspension 40 is plate-shaped and disc-shaped so as to correspond to the shape of the frame. The first suspension 40 is made of a metal plate such as phosphor bronze. As shown in FIG. 6, a plurality of long holes 46 are formed in the first suspension 40. Meanwhile, in another embodiment, the first suspension may be made of a polymer elastic material. Meanwhile, the yoke 50 is fixed to the center portion of the first suspension 40.

The first suspension 40 includes a first through hole 41 and a boss portion 42. The first through hole 41 is formed at the center of the first suspension 40, and the boss part 42 is formed to protrude upward from the first through hole 41. In the present embodiment, since the first suspension 40 is made of a metal plate, the boss portion 42 is easy to manufacture by various metal processing processes including press working.

The boss portion 42 has a hollow cylindrical shape in this embodiment. That is, the transverse cross section of the boss portion 42 is a hollow circle. On the other hand, in another embodiment, in addition to the cylindrical shape, the boss portion may be a columnar shape of various shapes such as triangles, squares, pentagons, ellipses, etc., the cross section is various, the interior of the boss portion may be empty or filled. In addition, when the first suspension is made of a polymer elastic material other than metal as in the case of the present embodiment, the boss portion is also made of the same material as the suspension.

The height of the boss portion 42 corresponds to the thickness of the yoke accommodation groove 52. In the present embodiment, the thickness of the boss portion 42 is slightly smaller than the thickness of the yoke 50.

The yoke 50 is fixed to the upper surface of the first suspension 40 in this embodiment. The yoke 50 includes a flat bottom portion 54 and a side wall portion 56 formed in a vertical direction surrounding the outer circumferential portion of the bottom portion 54. The first permanent magnet 60 is coupled to the bottom portion 54 of the yoke.

In the center of the yoke bottom portion 54, a yoke receiving groove 52 is provided to which the boss portion 42 of the first suspension 40 positioned below the yoke 50 is coupled. The yoke receiving groove 52 is provided in the boss portion 42 in a shape corresponding to the shape so that the boss portion 42 can be coupled.

In the present embodiment, since the boss portion 42 is cylindrical, the yoke receiving groove 52 is also cylindrical to correspond thereto. The size of the diameter of the yoke receiving groove 52 is slightly larger than the size of the outer diameter of the boss portion 42 so that a firm coupling is achieved even if the boss portion 42 is fitted into the yoke receiving groove without any adhesive. It is preferable to be comprised large. The boss portion 42 is inserted into the yoke receiving groove 52 to allow the mutual precise positioning. In some embodiments, an adhesive may be used between the boss portion 42 and the yoke receiving groove 52.

The first permanent magnet 60 is fixed to the inner bottom portion 54 of the yoke 50. The first permanent magnet 60 is fixed to the bottom portion 54 of the yoke 50 by a method such as an adhesive so as to be concentric with the yoke 50. The first permanent magnet 60 is formed in the shape of a disc so as to correspond to the shape of the yoke 50.

The plate 70 is fixed to an upper surface of the first permanent magnet 60. The plate 70 is made of a material that allows magnetic force to pass through, and has a diameter substantially the same as that of the first permanent magnet 60.

The first permanent magnet 60 and the plate 70 are fixed to be spaced apart from the side wall portion 56 of the yoke 50. A space is formed between the first permanent magnet 60 and the inner surface of the side wall portion 56 of the yoke 50 facing each other with the outer surface of the plate 70, and the lower portion of the voice coil 30 is formed in the space. Will be located.

Meanwhile, the first permanent magnet 60, the plate 70, and the yoke 50 constitute a magnetic circuit of the speaker. That is, the magnetic flux generated in the first permanent magnet 60 generates a magnetic flux path (path) entering the yoke 50 via the plate 70.

The second suspension 80 is disposed spaced downward from the first suspension 40. The outer periphery of the second suspension 80 is fixed to the frame 10 and is made of an elastic material. A second through hole 82 is formed in the central portion of the second suspension 80. A fourth stopper 140 to be described later penetrates and is inserted into the second through hole 82. As shown in FIG. 6, a plurality of long holes 86 are formed in the second suspension 80.

In the present embodiment, the second suspension 80 is made of the same material as the first suspension 40. However, in another embodiment, the materials of the first suspension 40 and the second suspension 80 may not be the same.

The second magnet 90 is fixed to the lower surface of the second suspension 80. Thus, the second magnet 90 is spaced apart from the first suspension 40 and the yoke 50. The polarity of the vertical direction of the second magnet 90 may be arranged in the S pole and the N pole from the top to the bottom as needed, and may be arranged in the N pole and the S pole from the top to the bottom. The second magnet 90 may be a permanent magnet or an electromagnet. Meanwhile, a second magnet receiving hole 92 through which the fourth stopper 140 penetrates is formed in the center portion of the second magnet 90.

On the other hand, the second magnet 90 and the second suspension 80 serves as a vibrator for generating a vibration signal. In the multifunction micro speaker 1 of the present embodiment, a vibrator composed of a second magnet 90 and a second suspension 80 includes a magnetic circuit composed of a first permanent magnet 60, a plate 70, and a yoke 50. Although spaced apart from each other, the magnetic circuit and the vibrator are connected to each other by a magnetic field, and the vibrating movement of the vibrating plate 20 for sound generation, and the vibrating movement of the vibrator consisting of the second magnet 90 and the second suspension 80 Mutual interference is minimized.

Hereinafter, the operation and effect of the multifunctional micro speaker 1 by the above configuration will be described.

Since the multifunction micro speaker 1 of the present embodiment includes the first stopper 100 and the fourth stopper 140, the yoke 50, the first permanent magnet 60, and the plate 70 constituting the magnetic circuit are provided. ) Can control the displacement in the left and right directions.

In addition, since the first stopper 100 is disposed to be spaced apart from the first suspension 40 in the vertical direction, there is an advantage that the amplitude of the vertical suspension of the first suspension 40 can be adjusted.

Meanwhile, in the above-described embodiment, the second suspension 80 and the second magnet 90 are exemplified, but the present invention is not limited to these embodiments. That is, even in a multifunctional micro speaker having only one suspension and one permanent magnet, the first stopper 100 may control the one-side movement displacement of the yoke 50.

In addition, in the present embodiment, the first stopper 100 and the fourth stopper 140 are both provided as an example, but any one side can control the displacement.

On the other hand, Figure 3 shows a multi-function micro speaker according to another embodiment of the present invention. In FIG. 3, components that perform the same functions as those of FIG. 2 are given the same reference numerals, and detailed description thereof will be omitted.

3, unlike FIG. 2, further includes a second stopper 110.

The second stopper 110 is spaced apart from the first stopper 100, and the first suspension 40 is disposed between the second stopper 110 and the first stopper 100. In addition, in the present embodiment, the second stopper 110 protrudes from the inner circumferential surface of the frame 10.

In the present embodiment, the one-side movement displacement of the yoke 50 is controlled by the first stopper 100 and the fourth stopper 140, and the separation distance between the first stopper 100 and the second stopper 110 is controlled. Corresponding to this, it provides an effect of adjusting the amplitude displacement in the vertical direction of the first suspension 40.

On the other hand, Figure 4 shows a multi-function micro speaker according to another embodiment of the present invention. In FIG. 4, components that perform the same functions as those of FIG. 2 are given the same reference numerals, and detailed description thereof will be omitted.

4 is provided with a third stopper 120, unlike FIG.

The third stopper 120 is spaced apart from the outer circumferential portion of the second magnet 90 and protrudes from the inner circumferential surface of the frame 10.

In the present embodiment, the one-side movement displacement of the second magnet 90 and the second suspension 80 constituting the vibrator is controlled by the fourth stopper 140 and the third stopper 120 and the second magnet. It provides an effect that can control the unilateral movement displacement of the vibrator by adjusting the separation distance with the outer peripheral portion of (90).

On the other hand, Figure 5 shows a multi-function micro speaker according to another embodiment of the present invention. In FIG. 5, the same reference numerals are assigned to components that perform the same functions as those in FIG. 2, and a detailed description thereof will be omitted.

5, unlike FIG. 2, the yoke receiving hole 58 penetrating the center portion of the yoke 50, the permanent magnet receiving hole 62 penetrating the center portion of the first permanent magnet 60, and the plate 70 Plate receiving hole 72 penetrating the center portion of the) is formed. The yoke receiving hole 58, the permanent magnet receiving hole 62 and the plate receiving hole 72 communicate with each other. The boss portion 42 protruding upward from the first through hole 41 of the first suspension 40 includes the yoke receiving hole 58, the permanent magnet receiving hole 62, and the plate receiving hole 72. It is coupled to each inner circumferential surface. The boss 42 has a bent portion 44 whose upper end portion is bent to the upper surface of the plate 70 through the plate receiving hole 72.

In addition, in the present embodiment, the fourth stopper 140 protruding upward from the center of the bottom cover member 11 of the frame 10 extends from the bottom of the frame 10 to the plate 70. The fourth stopper 140 is spaced apart from the inner circumferential surface of the first through hole 41, the inner circumferential surface of the yoke receiving hole 58, the inner circumferential surface of the permanent magnet receiving hole 62, and the inner circumferential surface of the plate receiving hole 72.

In addition, the present embodiment includes a second suspension 80 and a second magnet 90.

The second suspension 80 is spaced downward from the first suspension 40, the outer periphery is fixed to the frame 10, made of an elastic material, the fourth stopper 140 is penetrating through 2 through-holes 82 are formed.

The second magnet 90 is fixed to the bottom surface of the second suspension 80. A second magnet receiving hole 92 through which the fourth stopper 140 penetrates is formed at the center of the second magnet 90. The lower end of the fourth stopper 140 is formed with a protrusion 141 protruding toward the second magnet 90. The fourth stopper 140 is spaced apart from the inner circumferential surface of the second magnet receiving hole 92.

Thus, according to the embodiment of the present invention according to Figure 5, the advantage of the above-described embodiments, that is, the one-side movement displacement control of the yoke 50 by the first stopper 100 and the second stopper 140, the first In addition to being able to control the vertical amplitude displacement by the stopper 100, the yoke 50, the first permanent magnet 60, and the plate 70 are firmly coupled to each other, and provide an effect of improving assembly accuracy. .

Of course, the embodiment according to FIG. 5 may have various other modifications.

For example, although the embodiment of FIG. 5 includes both the first stopper 100 and the second stopper 140, only one of the first stopper and the second stopper may be provided.

In addition, although the boss part 42 penetrates the plate receiving hole 72 and is provided with the bending hole 44 in the embodiment of FIG. 5, the protruding length of the boss part 42 is at least the inner peripheral surface of the yoke receiving hole 58. FIG. It may be formed to a height coupled with. That is, the upper end of the boss portion 42 is coupled to the inner circumferential surface of the yoke receiving hole 58, or the position to be coupled to the inner circumferential surface of the permanent magnet receiving hole 62, or coupled to the inner circumferential surface of the plate receiving hole 72. May be placed in position.

In addition, although the yoke 50, the first permanent magnet 60, and the plate 70 penetrate each other, the yoke 50, the first permanent magnet 60, and the plate 70 may be in the form of a groove having a predetermined depth so that the boss portion 42 may be coupled thereto. The groove may be shaped like the yoke receiving groove 52 described above. Of course, the groove may be formed in the first permanent magnet 60 or the plate 70.

In addition, in the embodiment of FIG. 5, the fourth stopper 140 extends to the plate 70, but is unilaterally moved with the first suspension 40 when it extends to at least a position facing the inner circumferential surface of the first through hole 41. The displacement can be controlled. Accordingly, the upper end of the fourth stopper 140 faces the inner circumferential surface of the yoke receiving hole 58, or the position facing the inner circumferential surface of the permanent magnet receiving hole 62, or the inner circumferential surface of the plate receiving hole 72. It may be arranged in a position to.

Meanwhile, in another embodiment, a second magnet may be provided on the second suspension.

As mentioned above, although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above embodiments, and many various modifications may be provided without departing from the scope of the present invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims

frame;

A diaphragm having an outer circumferential portion fixed to the frame;

A voice coil fixed to the lower surface of the diaphragm;

A first suspension having an outer circumferential portion fixed to the frame and having elasticity;

A yoke fixed to the first suspension and having a bottom portion and a sidewall portion;

A first permanent magnet fixed to the bottom portion;

A plate fixed to an upper surface of the first permanent magnet; And

And a first stopper spaced apart from the side wall portion to prevent one side deflection of the yoke.
The method of claim 1,

And the first stopper is spaced apart from the first suspension.
The method of claim 1,

The first stopper is a multi-function micro speaker, characterized in that protruding from the inner peripheral surface of the frame.
The method of claim 3,

And the yoke is fixed to an upper surface of the first suspension.
The method of claim 4, wherein

A second stopper spaced apart from the first stopper;

And the first suspension is disposed between the first stopper and the second stopper.
The method of claim 5,

And the second stopper protrudes from an inner circumferential surface of the frame.
The method of claim 3,

The central portion of the first suspension is provided with a boss protruding upwards,

The yoke is provided with a yoke accommodating groove to which the boss of the first suspension is coupled.
The method of claim 3,

A yoke receiving hole penetrating the central portion of the yoke;

A permanent magnet accommodating hole penetrating the central portion of the first permanent magnet;

A plate receiving hole penetrating the central portion of the plate; And

A boss portion protruding upward from the center portion of the first suspension,

And the yoke receiving hole, the permanent magnet receiving hole, and the plate receiving hole communicate with each other, and an upper end of the boss portion is disposed at a position facing at least an inner circumferential surface of the yoke receiving hole.
The method of claim 8,

At least a portion of the upper end of the boss portion of the first suspension is a multifunctional micro speaker, characterized in that the bent portion is provided.
The method of claim 1,

A second suspension disposed spaced downward from the first suspension, having an outer circumferential portion fixed to the frame, and having an elasticity; And

And a second magnet fixed to the second suspension and spaced apart from the first suspension and the yoke.
The method of claim 10,

And a third stopper spaced apart from an outer circumferential portion of the second magnet and protruding from the inner circumferential surface of the frame.
frame;

A diaphragm having an outer circumferential portion fixed to the frame;

A voice coil fixed to the lower surface of the diaphragm;

A first suspension having an outer circumferential portion fixed to the frame, having an elasticity, and having a first through hole formed in a central portion thereof;

A yoke fixed to an upper surface of the first suspension;

A first permanent magnet fixed to the bottom portion;

A plate fixed to an upper surface of the first permanent magnet; And

And a fourth stopper protruding from a bottom surface of the frame and inserted into the first through hole and spaced apart from an inner circumferential surface of the first through hole.
The method of claim 12,

The first suspension is provided with a boss protruding upward from the first through hole,

The yoke is provided with a yoke receiving groove to which the boss of the first suspension is coupled,

The upper end portion of the fourth stopper is arranged at a position facing at least the inner circumferential surface of the first through hole.
The method of claim 12,

A yoke receiving hole penetrating the central portion of the yoke;

A permanent magnet accommodating hole penetrating the central portion of the first permanent magnet;

A plate receiving hole penetrating the central portion of the plate; And

Is provided with a boss protruding upward from the first through hole,

And the yoke receiving hole, the permanent magnet receiving hole, and the plate receiving hole communicate with each other, and an upper end of the boss portion is disposed at a position facing at least an inner circumferential surface of the yoke receiving hole.
The method of claim 12,

A second suspension disposed downwardly spaced from the first suspension, the outer periphery of which is fixed to the frame, is elastic, and has a second through hole through which the fourth stopper penetrates; And

Further comprising a second magnet fixed to the lower surface of the second suspension,

A second magnet receiving hole through which the fourth stopper penetrates is formed in the central portion of the second magnet,

And the fourth stopper is spaced apart from an inner circumferential surface of the second magnet receiving hole.
The method of claim 15,

A multi-function micro speaker, which protrudes from an outer circumferential surface of the lower end of the fourth stopper and is spaced apart from the second magnet.