KR101811733B1 - Micro-speaker having dampers and suspentions for stabilizing vibration of diaphragm - Google Patents

Abstract

The present invention relates to an apparatus for generating electric sound and, more specifically, to a micro-speaker having a damper vibration plate which attaches a damper vibration plate to a lower surface of a voice coil to stably vibrate a vibration plate in balance even when the amplitude of the voice coil increases so as to improve sound quality under high power. The micro-speaker having a damper vibration plate has a first damper vibration plate attached to an upper surface of the voice coil and a second damper vibration plate attached to a lower end of the voice coil or a second suspension to suppress a vibration of the voice coil so as to stably vibrate the vibration plate in balance, such that an abnormal vibration and a divided vibration are prevented, thereby obtaining high quality even under high output. The micro-speaker having a damper vibration plate of the present invention comprises a frame, a center vibration plate positioned at an upper end of the frame, a magnet system, a voice coil, and a second suspension fixed to the voice coil.

Description

[0001] The present invention relates to a micro-speaker having a damper diaphragm,

More particularly, the present invention relates to an electroacoustic transducer, and more particularly, to an electroacoustic transducer capable of vibrating the diaphragm in a stable and balanced manner even when the amplitude of the voice coil is increased by attaching a damper diaphragm to the lower surface of the voice coil, To a micro speaker equipped with a damper diaphragm.

2. Description of the Related Art Microspeakers are widely used to convert electrical signals into sound signals in portable electronic devices such as smart phones, portable communication terminals, notebook computers, and MP3 players.

The micro speaker includes a frame forming an internal space of a predetermined size, a magnetic circuit system accommodated in the internal space and forming a gap, a diaphragm mounted on the frame, and a voice attached to the lower surface of the diaphragm, Coil. At this time, the voice coil is fixed to the lower surface of the diaphragm. Therefore, when an external electric signal is applied to the voice coil, the voice coil is vibrated by the electromagnetic force, and when the voice coil vibrates, the vibration plate vibrates to convert the electric signal into a sound wave (sound).

However, in the conventional micro speaker, when the vibration amplitude of the voice coil becomes large, the vibration plate is fixed to only the upper end of the voice coil, so that the vibration of the vibration plate may be unbalanced. In order to solve such a problem, U.S. Patent No. 8,995,704 discloses a technique of further providing a suspension at the lower end of the voice coil.

However, the conventional suspension is made of a conductive material and is entirely attached to the lower surface of the voice coil in order to connect the lead wire of the voice coil and to apply an external electric signal to the voice coil. In addition, since both ends of the main body are protruded with a tongue piece such as a fixed arm or a connecting arm, the supporting force for supporting the voice coil is lowered and the structure is complicated in order to connect the connection terminal.

Therefore, even when the amplitude of the voice coil is increased by supporting the lower end of the voice coil firmly, the diaphragm is stably supported to prevent the abnormal vibration and the divided vibration, thereby improving the sound quality under high output power. And to develop a new type of micro speaker which does not cause malfunction.

U.S. Patent No. 8,995,704 (Registered on March 31, 2015)

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and it is a primary object of the present invention to provide a vibration plate, a vibration plate, And a damper diaphragm or suspension is provided at the lower end of the voice coil to improve the characteristics of the vibration mode generated at the time of high output, thereby improving the sound quality.

In addition, the present invention provides a micro speaker which is provided with a damper diaphragm or a suspension at the lower end of the voice coil to function as a high output speaker and is optimized for a Smart AMP (amplifying speaker).

According to an aspect of the present invention, there is provided a micro speaker having a damper vibration plate according to the present invention,

A frame having an upper end and a lower end opened and forming an inner space with a predetermined size therein;

A center diaphragm located at an upper end of the frame;

A first damper diaphragm whose edge is fixed to the frame and the center diaphragm is fixed to the center;

A yoke plate accommodated in an inner space of the frame and coupled to a lower end of the frame; an inner magnet located in the center of the yoke plate; an upper plate installed on an upper surface of the inner magnet; At least two outer magnets installed apart from each other, a magnet system forming a gap between the inner magnet and the outer magnet;

A voice coil attached to a lower surface of the center diaphragm and positioned in the cavity;

And a second suspension fixed to the voice coil,

Wherein the first damper diaphragm comprises an inner fixing part fixed to an edge of the center diaphragm, an outer fixing part fixed to an upper surface of the frame, and a connection dome connecting the inner fixing part and the outer fixing part;

The second suspension includes an inner fixing part attached to the voice coil, an outer fixing part fixed to the frame, and a connecting leg part composed of a plurality of elastic pieces connected between the inner fixing part and the outer fixing part,

The inner fixing part of the second suspension is fixed to a lower surface or a side surface of the voice coil, and the outer fixing part has a bottom surface of a protrusion protruding from the inner surface of the frame for a predetermined length or an inner surface of the protrusion And the inner fixed portion and the outer fixed portion are horizontal.

The second damper diaphragm plate may further include a first fixing part attached to a lower surface of the inner fixed part of the second suspension and a second fixing part attached to a lower surface of the second fixed part of the second suspension, A second fixing part fixed to the outer fixing part of the second suspension and a connection dome part connecting the first fixing part and the second fixing part so that the first fixing part and the second fixing part are horizontal.

And a first suspension fixed to an upper surface or a lower surface of the first damper diaphragm, wherein the first suspension includes an inner attachment portion fixed to an edge of the center diaphragm, an outer fixing portion fixed to an upper surface of the frame, And a connecting leg portion having a plurality of elastic pieces connecting the inner fixing portion and the outer fixing portion.

The second suspension and the second damper diaphragm are installed at corresponding corners or corners of four corners or corners of the voice coil.

The connection leg portion of the second suspension is disposed in a direction orthogonal to the connection leg portion formed on the first suspension.

According to the present invention, the first damper diaphragm attached to the upper surface of the voice coil and the second damper diaphragm attached to the lower end of the voice coil or the second suspension vibrate together to cause the voice coil to vibrate excessively, The first and second damper diaphragms or the second suspensions suppress the vibration of the voice coil so that the diaphragm vibrates stably and in a balanced manner to prevent the abnormal vibration and the divided vibration so that the sound quality is improved even under a high output .

FIG. 1 is a perspective view showing the overall appearance of a micro speaker having a damper diaphragm according to a preferred embodiment of the present invention. FIG.
FIG. 2 is a sectional view taken along the line AA of the micro speaker with the damper vibration plate shown in FIG. 1,
FIG. 3 is an exploded perspective view of the micro speaker with the damper vibration plate shown in FIG. 1,
4 is a perspective view showing an example of a second damper vibration plate according to an embodiment of the present invention,
5 is an explanatory view showing an example in which four second damper diaphragms are installed at four corners of a voice coil according to an embodiment of the present invention;
6 is a bottom perspective view showing an example in which four second damper diaphragms are installed at four corners of a voice coil according to an embodiment of the present invention,
FIG. 7 is a bottom perspective view of the micro speaker with the damper diaphragm shown in FIG. 6,
8 is a bottom perspective view showing an example in which two second damper diaphragms are installed at two corners of a voice coil according to an embodiment of the present invention,
FIG. 9 is an explanatory view showing the arrangement of a first damper diaphragm installed on the upper surface of the voice coil and two second damper diaphragms provided on the lower surface of the voice coil according to an embodiment of the present invention;
10 is an exploded perspective view of a micro speaker having a damper diaphragm according to another embodiment of the present invention,
11 is a partial sectional view of a micro speaker having the damper diaphragm shown in Fig. 10, Fig.
FIG. 12 is an explanatory view showing an arrangement of the first suspension and the second suspension according to an embodiment of the present invention;
13 to 15 are explanatory views showing various arrangement structures of the first suspension and the second suspension or the second damper diaphragm according to the present invention,
16 and 17 are plan views showing different embodiments of the first suspension according to the present invention,
18 and 19 are partial sectional views showing different embodiments of the first damper diaphragm plate and the second diaphragm plate according to the present invention,
20 and 21 are graphs showing vibration models of a conventional micro speaker and a micro speaker according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a micro speaker having a damper diaphragm according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the overall appearance of a micro speaker with a damper diaphragm according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of a micro speaker with a damper diaphragm shown in FIG. 1, FIG. 4 is a perspective view showing an example of a damper vibration plate according to an embodiment of the present invention, FIG. 5 is a perspective view illustrating a vibration speaker according to an embodiment of the present invention, And a second damper diaphragm.

As shown in the figure, a micro speaker 1 (hereinafter, referred to as a 'micro speaker') provided with a damper vibration plate according to the present embodiment includes a frame 11, a diaphragm (not shown) mounted on the upper end of the frame 11 A magnet system 14 accommodated in an inner space of the frame 11 and forming a cavity 101; a voice coil 13 attached to a lower surface of the vibration plate 12 and positioned between the cavities 101; A second damper diaphragm 15 fixed to the frame 11 and attached to a lower surface of the voice coil 13 and a second damper diaphragm 15 fixed to the frame 11 and fixing the edge of the diaphragm 12, And a protector 18 formed with a sound emission hole 19 for emitting the light emission hole 19. The diaphragm 12 includes a center diaphragm 121 having a central plate shape and a first damper diaphragm 16 fixed to an edge of the center diaphragm 121 and fixed to an upper end of the frame 11 .

5, a first damper diaphragm 16 is provided on the upper surface of the voice coil 13, and a second damper diaphragm 16 is provided on the lower surface of the voice coil 13. In this case, A damper diaphragm 15 is provided. Since the first and second damper diaphragms 15 and 16 support the voice coil 13 from above and below, even if the amplitude becomes large, the diaphragm 12 vibrates stably and uniformly, Do not occur.

2 and 3, the frame 11 includes a rectangular frame-shaped main body 110 having upper and lower ends opened, an inner space 111 surrounded by the main body 110, ). The main body 110 has a protruding portion 112 protruding from the inner surface of the main body 110 toward the inner space 111 by a predetermined length. A seating part 113 is formed at each of the four corners of the protrusion 112 so that the second damper diaphragm 15 can be fixed. Preferably, the seating portion 113 may be positioned below the upper surface of the protrusion 112.

Four fixing posts 120 corresponding to the fixing grooves 20 formed at the four corners of the protector 18 are vertically formed on the upper four corners of the main body 110. Four coupling walls 115 vertically protrude downward to correspond to the coupling grooves 149 formed at the four corners of the yoke plate 145, which will be described later, at four lower corners of the lower surface of the main body 110.

The diaphragm 12 is fixed to the upper surface of the frame 11. The center diaphragm 121 is formed at the center of the diaphragm 12 and the first damper diaphragm 16 is formed at the outer periphery of the center diaphragm 121. The first damper diaphragm 16 includes an inner fixing part 124 fixed to an edge of the center diaphragm 121, an outer fixing part 125 fixed to the upper surface of the frame 11, And a connection dome portion 123 connecting the outer fixing portion 125 and the outer fixing portion 125. The connection dome 123 is curved upward or downward to be formed in a circular trumpet or concave shape. The outer fixing part 125 is fixed to the upper surface of the frame 11 by the protector 18.

The voice coil 13 is coupled to the lower surface of the center diaphragm 121, specifically, to the lower surface of the inner fixed portion 124 to which the center diaphragm 121 and the first damper diaphragm 16 are coupled. The voice coil 13 has a rectangular frame shape having a predetermined height and includes an upper surface 131 coupled to the diaphragm 12 and a lower surface 131 disposed between the upper surface 131 and the lower surface 132 and a side surface 133 to which the upper surface 131 and the lower surface 132 are coupled. Also, a pair of lead wires 134 are drawn out from the voice coil 13.

The magnet system 14 includes a yoke plate 145, an inner magnet 141 positioned in the center of the yoke plate 145, an upper plate 146 disposed on the upper surface of the inner magnet 141, And four outer magnets 142 and 143 that are spaced apart from the outer surface of the yoke plate 145 by a predetermined distance. Therefore, a gap 101 in which the voice coil 13 is positioned is formed between the inner magnet 141 and the outer magnets 142 and 143.

At this time, the pair of first outside magnets 142a and 142b and the pair of second outside magnets 143a and 143b are disposed to face each other with the inside magnet 141 interposed therebetween. The first outer magnet 142a and the second outer magnet 143a and 143b are spaced apart from each other by a predetermined distance to prevent the second damper diaphragm 15 from being vibrated up and down, Thereby forming a space into which the engagement wall 115 formed on the lower surface of the frame 11 can be inserted.

The pair of first and second outer magnets 142 and 143 are positioned below the protruding portion 112 protruding to the inside of the frame 11. A step 117 for supporting the yoke plate 145 is formed at the lower end of the coupling wall 115 of the frame 111 and a sound pressure generated inside the micro speaker 1 is formed thereon A step 118 is formed for forming a sound pressure discharge hole 119 for discharging.

The second damper diaphragm 15 resiliently supports the lower surface of the voice coil 13 to suppress the vibration of the voice coil 13 and the diaphragm 12, As shown in FIG. At this time, although the second damper diaphragm 15 can support the entire lower surface of the voice coil 13, in this case, since the vibration of the voice coil 13 tends to be excessively suppressed, The voice coil 13 is provided at two opposing corners of four corners or at four corners 13a. The second damper diaphragm 15 may be installed only at two corner portions 13a of the four corners 13a of the voice coil 13 facing diagonally. In this case, however, Vibration may not be obtained.

4, an example of the second damper vibration plate 15 according to the present invention includes a first fixing part 151 attached to a lower surface of the voice coil 13, And a connection dome 153 formed between the first fixing part 151 and the second fixing part 152. At this time, the second damper diaphragm 15 is made of synthetic material, silicon, rubber or the like, which has a certain elasticity and is thin and easy to be processed and curved.

The first fixing part 151 may be a flat surface for easy attachment to the lower surface of the voice coil 13 and the second fixing part 152 may be formed in a plane Lt; / RTI > On the other hand, the connection dome 153 is curved in an upward or downward curved shape, and a corrugation 155 may be formed on all or a part of the connection dome 153 to have a predetermined elasticity. The first fixing part 151, the second fixing part 152 and the connecting dome part 153 have the same curvature. That is, since the corner 13a of the voice coil 13 is curved with a predetermined curvature, the first fixing part 151, the second fixing part 152, and the connecting dome 153 are also formed on the voice coil 13, As shown in Fig.

In the four corners of the protrusion 112 formed on the inner surface of the frame 11, a seating part 113 having a predetermined curvature corresponding to the second fixing part 152 is integrally formed. A space of a predetermined size is secured above and below the seating part 113 to prevent the connection dome 153 from bumping when it vibrates.

5, the first damper diaphragm 16 is attached to the upper surface of the voice coil 13 and the second damper diaphragm 15 is connected to the four corner portions of the voice coil 13 13a. At this time, the four second damper diaphragms 15 have the same size and shape. Preferably, the four second damper diaphragms 15 may have a shape similar to that of the four corners of the first damper diaphragm 16.

Referring to FIG. 6, the four second damper vibration plates 15 are installed in a space between the first and second outer magnets 142 and 143. The second fixing portion 152 of the second damper vibration plate 15 is attached to the lower surface of the seating portion 113. The yoke plate 145 is coupled to the lower surfaces of the first and second outer magnets 142 and 143. Therefore, a sufficient space is formed between the connection dome 153 of the second damper diaphragm 15 and the yoke plate 145.

8 is a bottom perspective view showing a micro speaker (hereinafter, referred to as 'micro speaker') 1 having a damper diaphragm according to another embodiment of the present invention. As shown in the figure, the second damper diaphragm 15A is attached to the lower ends of two opposing corners of the voice coil 13.

8 and 9, the second damper diaphragm 15A is formed in a " C "shape so as to correspond to one corner of the voice coil 13 and corners formed at both ends of the corner . That is, the second damper diaphragm 15A includes a first fixing part 151 attached to a lower surface of the voice coil 13, a second fixing part 152 attached to the frame 11, And a connection dome portion 153 formed between the first fixing portion 151 and the second fixing portion 152. The connection dome 153 is bent upward or downward, and a plurality of corrugations are formed around the corner.

When the first damper diaphragm 16 is provided on the upper surface of the voice coil 13 and the second damper diaphragm 15 is provided on the lower surface of the voice coil 13, The supporting force for supporting the voice coil 13 in the vertical direction is increased so that the diaphragm 12 can oscillate more stably and evenly when the amplitude of the voice coil 13 is increased.

In this case, a pair of outer magnets 142a and 142b are not installed below the connection dome 153 of the second damper diaphragm 15A so that the connection dome 153 smoothly vibrates up and down. That is, in this embodiment, the magnet system 14 includes only one inner magnet 141 and a pair of outer magnets 143a and 143b.

10 is an exploded perspective view showing a micro speaker (hereinafter, referred to as 'micro speaker') 1 having a damper diaphragm according to another embodiment of the present invention, FIG. 11 is an exploded perspective view of the micro speaker Fig.

As shown in the drawing, the micro speaker 1 of the present embodiment includes a frame 11 having upper and lower openings and forming a constant internal space 111 therein, A center diaphragm 121 fixed to the center of the upper surface of the first suspension 26 and a center diaphragm 121 fixed to the upper surface of the first suspension 26, A magnet system 14 accommodated in an inner space 111 of the frame 11 and forming an air gap 101; a first damper diaphragm 16 fixed to an edge of the frame 11; A voice coil 13 fixed to the cavity 101 and a second suspension 25 fixed to the voice coil 13 and a second damper fixed to a lower surface of the second suspension 25, And a vibration plate (15).

11, the first damper diaphragm 16 and the first suspension 26 are attached to the upper surface of the voice coil 13, and the second suspension 25 and the second damper diaphragm 15 The voice coil 13 is attached to the corresponding two corners of the voice coil 13 and the lower ends of the two corner portions 13a. Therefore, even if the amplitude of the voice coil 13 becomes excessively large, the two suspensions 25 and 26 and the two damper diaphragms 15 and 16 suppress the vibration of the voice coil 13, 121 to vibrate stably.

Specifically, the first damper diaphragm 16 includes an inner fixing part 124 fixed to an edge of the center diaphragm 121, an outer fixing part 125 fixed to an upper surface of the frame 11, And a connection dome 123 connecting the inner fixing portion 124 and the outer fixing portion 125. [ Preferably, the connection dome 123 is curved upwardly.

The first suspension 26 includes an inner attachment portion 264 to which the inner fixed portion 124 of the first damper vibration plate 16 is fixed, an outer attachment portion 265 fixed to the frame 11, And a connecting leg portion 263 connecting the inner mounting portion 264 and the outer mounting portion 265. The connecting leg portion 263 is formed of a curved tongue piece. The first suspension 26 has a connection terminal 267 formed on the outer mounting portion 265 so as to receive an external electrical signal and is connected to the lead wire of the voice coil 13 A pad 266 is integrally formed with the inner attachment portion 264. [ Preferably, the connecting legs 263 of the first suspension 26 are formed in such a manner that two elastically deformed pieces correspond to each other in a direction facing each other.

The second suspension 25 includes a first fixing part 251 fixed to a lower surface of the voice coil 13, a second fixing part 152 fixed to the frame 11, And a connecting leg portion 253 connecting the fixing portion 251 and the second fixing portion 252. At this time, the connection leg 253 is formed of two elastic pieces bent in a U-shape inward from both ends of the first fixing part 251 and then connected to the middle part of the second fixing part 252. The two tongue pieces 253a and 253b form a space which is a membrane of a certain size. At this time, the second fixing part 152 may be fixed to the lower surface or the upper surface of the protruding part 112 protruding from the inner surface of the frame 11, but in order to increase the amplitude of the voice coil 13, 112).

The second damper diaphragm 15 includes a first fixing part 151 fixed to the lower surface of the first fixing part 251 of the second suspension 25, A second fixing part 152 fixed to a lower surface of the fixing part 252 and a connection dome part 153 connecting the first fixing part 151 and the second fixing part 252. That is, the second damper diaphragm 15 and the second suspension 25 have similar sizes and shapes. At this time, the connection dome 153 is curved downward.

12, the connecting leg portion 263 of the first suspension 26 and the connecting leg portion 253 of the second suspension 25 are arranged in directions orthogonal to each other, It is preferable to balance the support force and the elasticity of the leg portion 253.

13, 14 and 15 show various embodiments of the first suspension 26, the second suspension 25, and the second damper diaphragm 25 described above, in which the first suspension 26 As shown in FIG.

13 shows an example in which a first suspension 26 is provided on the upper surface of the voice coil 13 and two second suspensions 26 are provided on the lower surface of the voice coil 13 so as to face each other. 14 shows that a first suspension 26 is provided on the upper surface of the voice coil 13 and two second suspensions 26 are provided on the lower surface of the voice coil 13, 2 damper diaphragm 15 are arranged to face each other. 15 shows an example in which a first suspension 26 is provided on the upper surface of the voice coil 13 and two second damper diaphragms 15 are provided on the lower surface of the voice coil 13 so as to face each other. It may be installed in various other ways, and thus is not limited thereto.

16 and 17 show an example of a first suspension 26 according to the present invention. FIG. 16 shows a state where two connecting legs 263 composed of two elastic pieces 263a and 263b are connected to each other 17 shows a case in which four elastic pieces 263a, 263b, 263c, and 263d are formed between the inner attachment portion 261 and the inner attachment portion 262, respectively . The first suspension 26 according to the present invention is applicable to any case, and the shape of the connecting leg portion 263 is not limited to the illustrated one.

18 and 19 show various mounting methods of the first damper diaphragm 16 and the second damper diaphragm 15 according to the present invention. The first damper diaphragm 16 is fixed to the upper surface of the voice coil 13 and the second damper diaphragm 15 is fixed to the lower surface of the voice coil 13, And the connection dome 152 of the second damper diaphragm 15 are both curved upward. When the connection dome 153 of the second damper diaphragm 15 is curved upwardly, the protrusion 112 of the frame 11 is sufficiently extended to the lower portion of the connection dome 153, It is preferable that a sufficient space is formed in the space.

The second fixing portion 152 of the second damper diaphragm 15 is fixed to the lower surface of the frame 11 or the protrusion protruding to the lower portion of the frame 11 and the first fixing portion 152 of the second damper diaphragm 15 The fixing portion 151 is fixed to the side surface 133 of the voice coil 13. At this time, the first fixing part 151 is bent upward so as to be attached to the side surface 133 of the voice coil 13 and extends a certain length.

19, the first damper diaphragm 16 is fixed to the upper surface of the voice coil 13 and the second damper diaphragm 15 is fixed to the lower surface of the voice coil 13, The connection dome portion 163 of the second damper diaphragm 16 is curved upward and the connection dome portion 152 of the second damper diaphragm 15 is curved downward. When the connection dome portion 153 of the second damper diaphragm 15 is bent downward, the edge of the yoke plate 145 is bent upward and extended to a predetermined length, It is preferable to form a sufficient space.

Therefore, when an external electric signal is applied to the voice coil 13, the micro speaker 1 according to the present invention is able to transmit an electric force to the voice coil 13 positioned in the cavity 101 of the magnet system 14 Occurs. The electric force of the voice coil 13 interacts with a magnetic force formed in the gap 101, so that the voice coil 13 acts as a force to vibrate up and down.

When the voice coil 13 vibrates vertically due to the interaction of the electromagnetic force, the diaphragm 12 attached to the upper end of the voice coil 13 vibrates up and down to generate a predetermined sound. At this time, the first damper diaphragm 16 attached to the upper surface of the voice coil 13 and the second damper diaphragm 15 attached to the lower end of the voice coil 13 vibrate together to form the voice coil 13 The first and second damper vibration plates 15 and 16 suppress the vibration of the voice coil 13 so that the vibration plate 12 vibrates stably and in a balanced manner The sound quality can be improved under a high output.

20 and 21 are results of analyzing a vibration model of a micro speaker according to the related art and a micro speaker according to the present invention. Referring to FIG. 20, in the case of the conventional micro speaker, since the long and short axis vibration mode in which the divided vibration occurs occurs in a low frequency band before 1.0 Khz, and occurs in a band having a relatively large amplitude, The probability of occurrence of joints is high. However, as shown in FIG. 21, in the case of the micro speaker according to the present invention, since the kneading vibration mode occurs in the band after 1.0 KHz, the frequency is shifted to the high frequency band where the amplitude decreases to the band after the resonance frequency of general micro speaker, It is possible to secure stable diaphragm driving mode with structure that is suitable for high power speaker with low impact structure.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And is not intended to limit the scope of the invention. In addition, the present invention is not limited to the above-described embodiments, but may be embodied in various forms. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the present invention pertains, It is only defined by the scope of the claims. Therefore, the definition should be based on the contents throughout this specification.

1: Micro speaker with a damper diaphragm 11: Frame
12: diaphragm 13: voice coil
14: Magnet system 15: Second damper diaphragm
16: first damper diaphragm 25: second suspension
26: Second suspension

Claims (5)

A frame having an upper end and a lower end opened and forming an inner space with a predetermined size therein;
A center diaphragm located at an upper end of the frame;
A first damper diaphragm whose edge is fixed to the frame and the center diaphragm is fixed to the center;
A yoke plate accommodated in an inner space of the frame and coupled to a lower end of the frame; an inner magnet located in the center of the yoke plate; an upper plate installed on an upper surface of the inner magnet; At least two outer magnets installed apart from each other, a magnet system forming a gap between the inner magnet and the outer magnet;
A voice coil attached to a lower surface of the center diaphragm and positioned in the cavity;
And a second suspension fixed to the voice coil,
Wherein the first damper diaphragm comprises an inner fixing part fixed to an edge of the center diaphragm, an outer fixing part fixed to an upper surface of the frame, and a connection dome connecting the inner fixing part and the outer fixing part;
The second suspension includes an inner fixing part attached to the voice coil, an outer fixing part fixed to the frame, and a connecting leg part composed of a plurality of elastic pieces connected between the inner fixing part and the outer fixing part,
The inner fixing part of the second suspension is fixed to a lower surface or a side surface of the voice coil, and the outer fixing part has a bottom surface of a protrusion protruding from the inner surface of the frame for a predetermined length or an inner surface of the protrusion And the inner fixing part and the outer fixing part are horizontally aligned on the upper surface or the lower surface of the micro speaker.
The method according to claim 1,
And a second damper diaphragm disposed on the lower surface of the second suspension, wherein the second damper diaphragm includes a first fixing part attached to a lower surface of the inner fixing part of the second suspension, and a second fixing part attached to the outer side of the second suspension A second fixing part fixed to the fixing part, and a connection dome part connecting the first fixing part and the second fixing part, wherein the first fixing part and the second fixing part are horizontally aligned with each other. speaker.
3. The method according to claim 1 or 2,
And a first suspension fixed to an upper surface or a lower surface of the first damper diaphragm, wherein the first suspension includes an inner attachment portion fixed to an edge of the center diaphragm, an outer fixing portion fixed to an upper surface of the frame, And a connecting leg portion having a plurality of elastic pieces connecting the inner fixing portion and the outer fixing portion.
3. The method of claim 2,
Wherein the voice coil has a planar shape in a rectangular frame shape and the second suspension and the second damper diaphragm are installed at corresponding corners or corners of four corners or corners of the voice coil. Micro speaker.
The method of claim 3,
And the connection leg portion of the second suspension is disposed in a direction orthogonal to the connection leg portion formed on the first suspension.

Images