CN101803403B - Ultra slim type acoustic transducer - Google Patents

Abstract

The present invention discloses a ultra slim type acoustic transducer which is reduced in thickness, wherein a magnetic closed circuit is constituted for acoustic transduction. The ultra slim type acoustic transducer includes a first magnet which is a vertical magnet (110), and a second magnet which is a horizontal magnet (120), and further includes a central yoke (130) coupled to a lower portion of the first magnet, and an outer yoke (140) coupled to a side surface of the second magnet (120) and also coupled to the central yoke (130), for defining an air gap with the first magnet. A part of a coil portion (150) is inserted into the air gap. The ultra slim type acoustic transducer includes a diaphragm (160) with the coil portion (150) mounted thereon, a protector (200) for protecting the diaphragm (160), and a frame (100) for supporting at least the outer yoke (140) and the protector (200).

Description

Ultra-thin acoustic transducer

technical field

The present invention relates to an ultra-thin acoustic transducer, more particularly, to an ultra-thin acoustic transducer with reduced thickness, in which a closed magnetic circuit is constructed for acoustic energy conversion.

Background technique

In general, according to Fleming's left-hand law (Fleming's left-hand law states that when a conductor through which current flows is placed in a magnetic field, a force is exerted on the conductor), the loudspeaker passes through the The coil section converts electrical energy into mechanical energy. That is, when a current signal including various frequencies is applied to the voice coil, the voice coil generates mechanical energy according to the current intensity and frequency level. Thus, the diaphragm attached to the coil portion is vibrated, thereby generating sound pressure of audible intensity.

By using a magnet (permanent magnet) and a top plate (or upper plate) in a yoke made of ferrous metal, the magnetic circuit of the speaker is designed so that the magnetic flux can be interconnected at right angles to the coil portion existing in the air gap. The coil portion is attached to the diaphragm for generating excitation force in the up-and-down direction by an input signal. Accordingly, the diaphragm attached to and confined by the frame is vibrated to generate sound pressure. The diaphragm has various waveforms for superior response characteristics and to eliminate buckling on up and down vibrations. The shape of the diaphragm becomes a design variable that greatly affects the frequency characteristics.

FIG. 1 is a cross-sectional view showing a conventional ultra-thin sound transducer, and FIG. 2 is a structural view showing a closed magnetic circuit of the conventional ultra-thin sound transducer.

Referring to Fig. 1, a traditional ultra-thin acoustic transducer includes: a frame 1; a yoke 2, which is inserted and installed in the frame 1; an inner ring magnet 3 and an outer ring magnet 4, which are used to transmit magnetic force to the yoke 2 or Receive magnetic force from yoke iron 2, and the magnetization direction of inner ring magnet 3 and outer ring magnet 4 is vertical direction, makes magnetic force can be transmitted to coil part 7 from inner ring magnet 3 and outer ring magnet 4 vertically; Coil part 7, Partially inserted into the air gap between the inner ring magnet 3, the inner ring top plate 5 and the outer ring magnet 4, the outer ring top plate 6, for preventing magnetic flux leakage and transmitting the magnetic flux vertically to the coil part 7; the diaphragm 8 , a coil portion 7 is attached to the diaphragm; a protector 9 for protecting the diaphragm 8 ; and a sound outlet 10 is formed in the protector 9 .

As shown in Figures 1 and 2, the inner ring magnet 3 and the outer ring magnet 4 are magnetized in the vertical direction on the yoke 2 to transmit the magnetic force to the coil part 7 at right angles, and the inner ring top plate 5 and the outer ring The top plate 6 is stacked on the magnets 3 and 4 in sequence. The inner ring magnet 3 and the outer ring magnet 4 have opposite polarity N or S.

The diaphragm 8 is coupled with a coupling protrusion formed upward at the upper edge of the horizontal surface of the frame 1 . An electric signal corresponding to the sound or tone to be played back is applied to both ends of the coil portion 7 wound up in a ring shape. The coil portion 7 is attached to the bottom surface of the diaphragm 8 up to the space between the inner ring magnet 3 and the outer ring magnet 4 . A protector 9 made of metal is coupled with the frame 1 on the upper part of the diaphragm 8 to ensure the upper and lower vibration spaces of the diaphragm 8 and to protect the diaphragm 8 .

In the above-mentioned conventional ultra-thin sound transducer, when the alternating current signal corresponding to the sound or sound to be reproduced is applied to both ends of the coil portion 7, the yoke 2, the magnets 3 and 4, and the top plates 5 and 6 form a closed magnetic circuit. The magnetic flux interconnects the coil portion 7, and the diaphragm 8 to which the coil portion 7 is attached vibrates together with the coil portion 7 to thereby generate sound pressure of an audible intensity.

However, since the conventional ultra-thin acoustic transducer has a large number of components, the stacked structure and the magnetic circuit of the acoustic transducer are thick, which increases the unit cost of production. If the inner annular magnet 3, the outer annular magnet 4, and the inner annular top plate 5 and the outer annular top plate 6 stacked on the magnets 3 and 4 are removed to reduce the thickness of the traditional ultra-thin sound transducer, then The sound pressure drops due to the reduced magnetic flux interconnected with the coil portion 7, which degrades the performance and reliability of the conventional ultra-thin sound transducer.

Contents of the invention

technical problem

Therefore, the present invention intends to solve the aforementioned problems in the prior art. An object of the present invention is to provide an ultra-thin sound transducer capable of minimizing the size in the vertical direction by reducing components.

Another object of the present invention is to provide an ultra-thin acoustic transducer capable of preventing reduction in magnetic flux interconnection by increasing the volume of a magnet.

Technical solutions

In order to achieve the above object, an ultra-thin sound transducer is provided, comprising: a first magnet, which is a vertical magnet; a second magnet, which is a horizontal magnet, and the second magnet is formed to have a predetermined air gap from the first magnet a central yoke coupled to the lower portion of the first magnet; and an outer yoke coupled to the side surface of the second magnet and also coupled to the central yoke. The ultra-thin acoustic transducer also includes: a coil portion at least partially inserted into the air gap; a diaphragm on which the coil portion is mounted; a protection device for protecting the diaphragm; and a frame for Support at least the outer yoke and guard.

A first magnetic circuit is formed in said air gap between the first magnet and the second magnet, and a second magnetic circuit is formed in the center yoke and the outer yoke between the second magnet and the first magnet, A closed magnetic circuit is formed by the first magnet and the second magnet, the central yoke and the outer yoke.

In another aspect of the present invention, an ultra-thin acoustic transducer is provided, comprising: a yoke having a central portion and a peripheral portion, the peripheral portion defining a space symmetrical around the central portion; a first magnet being a vertical a magnet coupled with the upper portion of the central portion; a second magnet, being a horizontal magnet, defining an air gap in the space together with the first magnet, and coupled with the inner surface of the peripheral portion; a coil portion partially inserted into the In the air gap; a diaphragm on which the coil portion is mounted; a protector for protecting the diaphragm; and a frame for supporting at least the yoke and the protector.

A first magnetic circuit is formed in the air gap between the second magnet and the first magnet in the space, and a magnetic path is formed in the central portion and the peripheral portion between the first magnet and the second magnet. The second magnetic circuit is a closed magnetic circuit formed by the first magnet, the second magnet and the yoke.

In yet another aspect of the present invention, an ultra-thin acoustic transducer is provided, comprising: a first magnetic circuit formed between a first magnet and a second magnet, the second magnet having a magnetization direction opposite to that of the first magnet perpendicular to the direction of magnetization and defining an air gap with the first magnet; a coil portion at least partially inserted into the air gap; a diaphragm on which the coil portion is mounted; and a second magnetic circuit formed by the second magnet A path forming portion with the first magnet is formed. A closed magnetic circuit is formed by the first magnet, the first magnetic circuit, the second magnet and the second magnetic circuit.

Beneficial effect

According to the present invention, by maximizing the volume of the first magnet and the second magnet, by shortening the length of the minor axis portion of the first magnet and the second magnet, and increasing the length of the major axis portion of the first magnet and the second magnet, The ultra-thin sound transducer can amplify the playback sound or the output level of the sound.

Furthermore, according to the present invention, the ultra-thin sound transducer can obtain high sound quality with a minimum number of components.

Description of drawings

Fig. 1 is a sectional view showing a conventional ultra-thin acoustic transducer;

Fig. 2 is the structural diagram showing the closed magnetic circuit of traditional ultra-thin acoustic transducer;

3 is an exploded perspective view showing an ultra-thin acoustic transducer according to a first embodiment of the present invention;

4 is an internal assembly diagram showing a part of the ultra-thin acoustic transducer according to the first embodiment of the present invention;

5 is a sectional view showing the short axis direction of the ultra-thin acoustic transducer according to the first embodiment of the present invention;

6 is a sectional view showing the long axis direction of the ultra-thin acoustic transducer according to the first embodiment of the present invention;

7 is a structural diagram showing a part of a closed magnetic circuit of an ultra-thin acoustic transducer according to a first embodiment of the present invention;

8 is a front perspective view showing an ultra-thin acoustic transducer according to a first embodiment of the present invention;

9 is a rear perspective view showing an ultra-thin acoustic transducer according to a first embodiment of the present invention;

10 is a perspective view showing a part of an ultra-thin acoustic transducer according to a second embodiment of the present invention;

11 is a perspective view showing a part of an ultra-thin acoustic transducer according to a third embodiment of the present invention;

12 is a sectional view showing a part of an ultra-thin acoustic transducer according to a third embodiment of the present invention; and

Fig. 13 is a perspective view showing a part of an ultra-thin acoustic transducer according to a fourth embodiment of the present invention.

Detailed ways

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

3 is an exploded perspective view showing an ultra-thin acoustic transducer according to a first embodiment of the present invention, and FIG. 4 is an internal assembly diagram showing a part of an ultra-thin acoustic transducer according to a first embodiment of the present invention .

3 and 4, the ultra-thin acoustic transducer according to the first embodiment of the present invention includes a frame 100, a first magnet 110, a second magnet 120, a central yoke 130, an outer yoke 140, a coil part 150 , diaphragm 160 , terminal 170 and protection device 200 . In FIG. 4, A-A' indicates the long axis of the ultra-thin acoustic transducer, and B-B' indicates the short axis of the ultra-thin acoustic transducer.

The first magnet 110 for transmitting magnetic force through the sound outlet hole 201 is fixedly attached to the upper portion of the center yoke 130 . The center yoke 130 on which the first magnet 110 is fixedly installed is coupled with a lower portion of the outer yoke 140 inserted into the frame 100 . Two second magnets 120 are disposed on both sides of the first magnet 110 . Each second magnet 120 is fixedly installed on the inner surface of the outer yoke 140 and defines a predetermined air gap 101 together with the first magnet 110 .

A part of the coil part 150 is inserted into the air gap 101 between the first magnet 110 and the second magnet 120 . The diaphragm 160 coupled with the coil part 150 is fixed by the protector 200 and the frame 100 , and the terminal 170 is inserted and installed in the frame 100 .

When an electric signal is input, the first magnet 110 and the second magnet 120 generate a magnetic field. Due to the magnetic fields generated by the magnets 110 and 120, the coil part 150 reciprocates so that attraction and repulsion repeatedly occur. The diaphragm 160 vibrates with the vibration of the coil part 150 to generate sound pressure accordingly. The terminal 170 provides electrical connection with the components, the protection device 200 protects the diaphragm 160 from external influences, and the frame 100 supports the outer yoke 140 or the terminal 170 and the protection device 200 to maintain the vibration space of the diaphragm 160 up and down.

Fig. 5 is a sectional view showing the minor axis direction of the ultrathin sound transducer according to the first embodiment of the present invention, and Fig. 6 is a long sectional view showing the ultrathin sound transducer according to the first embodiment of the present invention A sectional view in the axial direction, FIG. 7 is a structural view showing a part of the closed magnetic circuit of the ultra-thin acoustic transducer according to the first embodiment of the present invention. Specifically, FIG. 5 is a cross-sectional view taken along line A-A' (major axis) shown in FIG. 4 , and FIG. 6 is a cross-sectional view taken along line B-B' (short axis) shown in FIG. 4 .

Referring to FIGS. 5 , 6 and 7 , the second magnet 120 closely attached to the inner surface of the outer yoke 140 inserted into the frame 100 is magnetized in N polarity or S polarity in the horizontal direction. . The first magnet 110 coupled to the upper portion of the center yoke 130 is magnetized in a vertical direction and has a polarity vertically symmetrical to that of the second magnet 120 , ie, S polarity or N polarity.

Magnetic flux interconnection is facilitated by shortening the lengths of the first magnet 110 and the second magnet 120 in the minor axis direction and increasing the lengths of the first magnet 110 and the second magnet 120 in the major axis direction. In addition, the first magnet 110 and the second magnet 120 are disposed flush with each other. Thus, the ultra-thin acoustic transducer according to the present invention minimizes the size in the vertical direction by simplifying components without reducing the magnetic flux interconnection.

The first magnet 110 and the second magnet 120, the central yoke 130 and the outer yoke 140 form a closed magnetic circuit of the ultra-thin acoustic transducer. The second magnet 120 has N polarity and the first magnet 110 has S polarity. A magnetic circuit and a second magnetic circuit connected from the first magnet 110 to the second magnet 120 via the central yoke 130 and the outer yoke 140 coupled with the central yoke 130, wherein the coil placed in the sound outlet 201 Section 150 is interconnected with magnetic flux.

The first magnet 110 has N polarity and the second magnet 120 has S polarity. The second magnetic circuit connected to the first magnet 110 via the outer yoke 140 constitutes.

More specifically, when the second magnet 120 has N polarity and the first magnet 110 has S polarity, as seen on the minor axis surface, the left part of the second magnet 120 which is a horizontal magnet has S polarity, and the right part has S polarity. A portion has N polarity, a lower portion of the first magnet 110 which is a vertical magnet vertically symmetrical to the second magnet 120 has N polarity, and an upper portion has S polarity. Therefore, the magnetic flux moves from left to right in the second magnet 120 and from top to bottom in the first magnet 110 .

In the first magnetic circuit, magnetic flux flows from the N pole formed on the right portion of the second magnet 120 to the S pole formed on the upper surface of the first magnet 110 via the air gap 101 . In the second magnetic circuit, magnetic flux flows from the S pole formed at the upper portion of the first magnet 110 to the N pole formed at the lower portion of the first magnet 110, passing through the center yoke 130 fixedly coupled to the first magnet 110. and the outer yoke 140 , and flow into the S pole formed on the left portion of the second magnet 120 . The first magnetic circuit and the second magnetic circuit constitute a closed magnetic circuit. In this closed magnetic circuit, the magnetic force is even interconnected with the weaker, bent portion 152 of the coil portion 150, so that the magnetic flux density is uniform.

8 is a front perspective view showing an ultra-thin acoustic transducer according to a first embodiment of the present invention, and FIG. 9 is a rear perspective view showing an ultra-thin acoustic transducer according to a first embodiment of the present invention .

As shown in FIGS. 8 and 9 , the second magnets ( 120 ; see FIG. 4 ) are coupled in pairs with the inner surfaces of the outer yokes ( 140 ; see FIG. 4 ) inserted into the frame 100 . The center yoke 130 fixedly coupled to the first magnet 110 is fixedly coupled to the bottom surface of the outer yoke (140; see FIG. 4 ), wherein the first magnet 110 communicates with the second magnet (120; see FIG. Figure 4) separated. An air gap 101 of a predetermined size between the center yoke 130 completely attached to the bottom surface of the outer yoke (140; see FIG. 4 ) and the second magnet (120; see FIG. 4 ) serves as a coil portion (150; see FIG. Figure 5) the insertion space and the rear sound hole. The protector 200 made of metal secures a vibration space of the diaphragm 160 and protects other components including the frame 100 .

In the following description, the same reference numerals are used for the same elements as those of the first embodiment of the present invention.

Fig. 10 is a perspective view showing a part of an ultra-thin acoustic transducer according to a second embodiment of the present invention. The first magnet 110 magnetized in the vertical direction is attached to the center yoke 130, and the pair of second magnets 120 magnetized in the horizontal direction are attached to the outer yoke inserted into the frame (100; see FIG. 4 ). 140 inner surface. The center yoke 130 on which the first magnet 110 is installed is attached and coupled to the lower portion of the outer yoke 140 . The above and other components of the second embodiment are the same as those of the first embodiment except for the top plate 190 further provided on the upper portion of the first magnet 110 .

The top plate 190 contains a magnetic material to transmit magnetic force to the coil portion (150; see FIG. 5). The top plate 190 is formed in the same shape as the upper surface of the first magnet 110 to prevent magnetic force from being transmitted outward. At the same time, the horizontal area of the ultra-thin acoustic transducer remains unchanged. Since the top plate 190 is formed in the space between the diaphragm and the first magnet 110, the ultra-thin acoustic transducer can enhance magnetic flux interconnection without increasing the size in the vertical direction.

In the second embodiment, a closed magnetic circuit in which the second magnet 120 has N polarity and the first magnet 110 has S polarity will be described. As seen on the minor axis surface, the left part of the second magnet 120 has S polarity, the right part of the second magnet 120 has N polarity, the upper part of the first magnet 110 has S polarity, and the lower part has N polarity.

Therefore, in the first magnetic circuit, when interconnected with the coil part 150, magnetic flux flows from the N pole formed at the right portion of the second magnet 120 to the S pole of the first magnet 110 and the pole formed at the first magnet 110 via the air gap 101. Top plate 190 on 110. In the second magnetic circuit, the magnetic flux starts from the top plate 190, flows from the S pole formed on the upper part of the first magnet 110 to the N pole formed on the lower part of the first magnet 110, and passes through the center yoke 130 and the outer yoke. 140, and flows into the S pole formed on the left part of the second magnet 120. The first magnetic circuit and the second magnetic circuit constitute a closed magnetic circuit. In this closed magnetic circuit, the magnetic force is even interconnected with the weaker, bent portion 152 of the coil portion 150, so that the magnetic flux density is uniform.

11 is a perspective view showing a part of an ultra-thin sound transducer according to a third embodiment of the present invention, and FIG. 12 is a sectional view showing a part of an ultra-thin sound transducer according to a third embodiment of the present invention .

Fig. 12 is a sectional view seen from the direction C shown in Fig. 11 . Except for the height of the first magnet 110, the components and coupling method of the ultra-thin acoustic transducer of the third embodiment are the same as those of the first embodiment. Specifically, the upper surface of the first magnet 110 is positioned lower than the upper surface of the second magnet 120 .

In the third embodiment, a closed magnetic circuit in which the second magnet 120 has N polarity and the first magnet 110 has S polarity will be described. The left part of the second magnet 120 has S polarity and the right part has N polarity, and the upper part of the first magnet 110 has S polarity and the lower part has N polarity.

Therefore, in the first magnetic circuit, when interconnected with the coil part 150 , magnetic flux flows from the N pole formed at the right portion of the second magnet 120 to the S pole formed at the upper portion of the first magnet 110 via the air gap 101 . Since the upper portion of the first magnet 110 is placed relatively low, magnetic flux flow is facilitated in the first magnetic circuit. In the second magnetic circuit, the magnetic flux flows from the S pole formed on the upper part of the first magnet 110 to the N pole formed on the lower part of the first magnet 110, passes through the center yoke 130 and the outer yoke 140, and flows into the formed The S pole on the left part of the second magnet 120 . The first magnetic circuit and the second magnetic circuit constitute a closed magnetic circuit. In this closed magnetic circuit, the magnetic force is even interconnected with the weaker, bent portion 152 of the coil portion 150, so that the magnetic flux density is uniform.

Fig. 13 is a perspective view showing a part of an ultra-thin acoustic transducer according to a fourth embodiment of the present invention. The ultra-thin acoustic transducer according to the fourth embodiment of the present invention includes a frame 100 , a first magnet 110 , a second magnet 120 , a yoke 130 , a coil part 150 , a diaphragm 160 , a terminal 170 and a protection device 200 .

The yoke 130 is divided into a central portion 132 and a peripheral portion 133 . The upper portion of the central portion 132 is fixedly coupled to the first magnet 110 , and the peripheral portion 133 defines a space 134 symmetrical around the central portion 132 . In the space 134 , the second magnets 120 are coupled in pairs to the inner surface of the peripheral portion 133 . Other components and coupling methods are the same as in the first embodiment.

In the fourth embodiment, a closed magnetic circuit in which the second magnet 120 has N polarity and the first magnet 110 has S polarity will be described. As seen on the surface of the minor axis, the left part of the second magnet 120 has S polarity, while its right part has N polarity, and the upper part of the first magnet 110 has S polarity, while its lower part has N polarity. .

In the first magnetic circuit, magnetic flux flows from the N pole formed at the right portion of the second magnet 120 in the space 134 to the S pole formed at the upper portion of the first magnet 110 via the air gap 101 . In the second magnetic circuit, magnetic flux flows from the S pole formed at the upper portion of the first magnet 110 to the N pole formed at the lower portion of the first magnet 110, passes through the central portion 132 and the peripheral portion 133 of the yoke 130, and The flow flows into the S pole formed on the left portion of the second magnet 120 . This process is repeated. In this closed magnetic circuit, the magnetic force is even interconnected with the weaker, bent portion 152 of the coil portion 150, so that the magnetic flux density is uniform.

In a fifth embodiment of the present invention, the closed magnetic circuit is constituted by the first magnet, the second magnet, and the path forming portion. The components and coupling method of the fifth embodiment are the same as those in the first embodiment except for the path forming portion. The fifth embodiment is described in detail without a drawing.

In the fifth embodiment, the first magnetic path is formed in the air gap (101; see FIG. 7) between the second magnet (120; see FIG. 7) and the first magnet (110; see FIG. 7), and the second The second magnetic path is formed by a path forming portion (not shown) connecting the first magnet (110; see FIG. 7) to the second magnet (120; see FIG. 7). The first magnetic circuit and the second magnetic circuit constitute a closed magnetic circuit. In this closed magnetic circuit, the magnetic force is even interconnected with the weaker, curved portion (152; see FIG. 7) of the coil portion (150; see FIG. 7), so that the magnetic flux density is uniform.

Industrial Applicability

According to the present invention, in the ultra-thin acoustic transducer, the first magnet 110 which is a vertical magnet, the second magnet 120 which is a horizontal magnet, the central yoke 130 and the outer yoke 140 form a closed magnetic circuit. Since the amount of the horizontal surfaces of the first magnet 110 and the second magnet 120 is maximized, the sound or the output level of the sound to be played back is amplified, but the total number of components is reduced. Therefore, the ultra-thin acoustic transducer can obtain high sound quality with a minimum number of components. In the prior art, the magnetic flux is transmitted to the coil portion 150 at a right angle. According to the present invention, the outer yoke 140 and the center yoke 130 are arranged so as to make the magnetic flux density uniform.

Although preferred embodiments of the present invention have been described, it should be understood that the present invention is not limited to these preferred embodiments, but various modifications can be made by those skilled in the art within the spirit and scope of the invention as described in the appended claims. Alterations and Variations.

Claims (19)

1. ultra slim type acoustic transducer comprises:

The first magnet, this first magnet is vertical magnet;

The second magnet, this second magnet is horizontal magnet, and forms apart from the first magnet predetermined air gap is arranged;

The center yoke, the bottom coupling of this center yoke and the first magnet;

Outer yoke, the side surface coupling of this outer yoke and the second magnet, and be coupled with the center yoke;

Coiler part, this coiler part are inserted in described air gap at least in part;

Vibrating diaphragm is equipped with described coiler part on this vibrating diaphragm;

Protective device is for the protection of described vibrating diaphragm; And

Framework is used for supporting at least described outer yoke and described protective device.

2. ultra slim type acoustic transducer as claimed in claim 1, wherein, be formed with the first magnetic circuit in described air gap between the first magnet and the second magnet, and be formed with the second magnetic circuit between the second magnet and the first magnet in described center yoke and outer yoke, consist of closed magnetic circuit by the first magnet and the second magnet, center yoke and outer yoke.

3. ultra slim type acoustic transducer as claimed in claim 2, wherein, in described the first magnetic circuit, magnetic flux flows between the upper surface of the side of the second magnet and the first magnet.

4. ultra slim type acoustic transducer as claimed in claim 1, wherein, described the second magnet is formed on two side surfaces of the first magnet in couples.

5. as the described ultra slim type acoustic transducer of arbitrary claim in claim 1 to 4, wherein, divide on the top of described the first magnet to be provided with top board.

6. ultra slim type acoustic transducer as claimed in claim 5, wherein, described the first magnetic circuit is formed between the second magnet and top board.

7. as the described ultra slim type acoustic transducer of arbitrary claim in claim 1 to 4, wherein, the upper surface of the first magnet is set to the upper surface lower than the second magnet.

8. ultra slim type acoustic transducer comprises:

Yoke, this yoke has core and periphery, and this periphery limits around the space of this core symmetry;

The first magnet, this first magnet are the vertical magnet with the upper partial coupling of this core;

The second magnet, this second magnet is horizontal magnet, this horizontal magnet is limiting air gap in described space together with the first magnet, and with the coupling of the inner surface of described periphery;

Coiler part, this coiler part partly are inserted in described air gap;

Vibrating diaphragm is equipped with described coiler part on this vibrating diaphragm;

Protective device is for the protection of described vibrating diaphragm; And

Framework is used for supporting at least described yoke and described protective device.

9. ultra slim type acoustic transducer as claimed in claim 8, wherein, be formed with the first magnetic circuit between the second magnet in described space and the first magnet in described air gap, and be formed with the second magnetic circuit in described core and periphery between the first magnet and the second magnet, consist of closed magnetic circuit by the first magnet and the second magnet and yoke.

10. ultra slim type acoustic transducer as claimed in claim 9, wherein, in described the first magnetic circuit, magnetic flux flows between the upper surface of the side of the second magnet and the first magnet.

11. ultra slim type acoustic transducer as claimed in claim 8, wherein, described the second magnet is formed on two side surfaces of the first magnet in couples.

12. as the described ultra slim type acoustic transducer of arbitrary claim in claim 8 to 11, wherein, divide on the top of described the first magnet to be provided with top board.

13. ultra slim type acoustic transducer as claimed in claim 12, wherein, described the first magnetic circuit is formed between the second magnet and described top board in described space.

14. a ultra slim type acoustic transducer comprises:

The first magnet;

The second magnet, described the second magnet forms apart from described the first magnet predetermined air gap, and have the direction of magnetization vertical with the direction of magnetization of described the first magnet, and be formed with the first magnetic circuit in the described air gap between described the first magnet and described the second magnet;

The center yoke, the bottom coupling of described center yoke and described the first magnet;

Outer yoke, the side surface coupling of described outer yoke and described the second magnet, and be coupled with the center yoke;

Coiler part, this coiler part are inserted in described air gap at least in part;

Vibrating diaphragm is equipped with described coiler part on this vibrating diaphragm; And,

Be formed with the second magnetic circuit between the second magnet and the first magnet in described center yoke and outer yoke.

15. ultra slim type acoustic transducer as claimed in claim 14, wherein, described the first magnet is vertical magnet, and described the second magnet is horizontal magnet.

16. as the described ultra slim type acoustic transducer of arbitrary claim in claim 14 to 15, wherein, in described the first magnetic circuit, magnetic flux flows between the upper surface of the side of the second magnet and the first magnet.

17. as the described ultra slim type acoustic transducer of arbitrary claim in claim 14 to 15, wherein, divide on the top of described the first magnet to be provided with top board.

18. ultra slim type acoustic transducer as claimed in claim 17, wherein, described the first magnetic circuit is formed between the second magnet and top board.

19. ultra slim type acoustic transducer as claimed in claim 14, wherein, described the second magnet is formed on the both sides of the first magnet in couples.

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